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Today we’re going to talk about gaskets and seals. These terms are generally used interchangeably. After all, gaskets seal a joint…so they’re the same, aren’t they?


Gaskets vs. Seals


The terms “gaskets” and “seals” are often used interchangeably. The fundamental difference is that a gasket is a physical piece that goes between two flanges to create a seal at a joining point between two components. A gasket is a seal. “Seals” is a category that encompasses many types of seals. In addition to gaskets, there are rotary seals, O-ring seals, liquid sealants, mechanical seals, shaft seals, valve stem seals, and packings, just to name a few.


Seals are generally moulded or machined product, often flat and round such as an O-ring. Gaskets are cut into different shapes so that they fit the design and bolt spacing of a component.


Gaskets are used to seal two components or flanges that have a flat surface. Seals are used to describe parts that are used between engine parts, pumps and shafts that rotate. Gaskets are used as static seals.


When a Seal is used between engine parts, pumps and shafts that rotate, it is described as a dynamic seal. Seals are required to keep leaks from occurring within a moulded or machined product.


When a gasket breaks down or a machine is serviced the gaskets need replacing. A seal within a bearing needs complete replacement of both the seal and bearing if there is a seal breakdown.


Now You Know


This has been a very general explanation of this topic, but hopefully it has provided some insight into a basic definition of sealing mechanisms. To sum up, a gasket is a seal, but a seal isn’t necessarily a gasket.


If you have any interest in gaskets and seals, I recommend that you can visit Chain Yeeh Industrial Co., Ltd. – the company specializes in kinds of rubber parts. Get more details about Chain Yeeh, please feel free to contact them at 886-4-865-3322.



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If part of your daily life is dealing with pieces and blocks of wood, then you need the right saw blade to make your reciprocating saw versatile and powerful. With such a saw blade as part of your woodcutting arsenal, you can cut through wood easily. Also, some blades even have the right level of sharpness to cut through fiberglass, masonry, and even metal.


If you choose a low quality reciprocating saw blade, then you’re reciprocating saw is as good as a paperweight. Low-quality blades won’t be able to make precision cuts, and they will have a difficult time in cutting even soft types of wood. What happens next is that your pieces of wood (or other materials) won’t have the necessary smoothness and accuracy. The result for this is that you’re going to make extra efforts to fix the damage that has been done.


Do not underestimate the power of a high-quality blade for your reciprocating saw. Albeit some of the top-of-the-line reciprocating blades might be more expensive than what you would normally purchase, these can last longer, and they can cut better.


The importance of having high quality, durable, and sharp blades for your reciprocating saw could not be stressed enough if your profession deals with wood on a daily basis.


Who Should Buy Reciprocating Saw Blades?

A reliable set of reciprocating blades is designed for specific woodworking tasks. A worker wouldn’t use the same blade design on all types of wood. As such, sets of different types of blades are required for the serious woodworker. If you only have one set or even just one blade in your toolbox, then you’re not going to get very far for all of your wooden projects.


Think about this – it’s like cutting a piece of thick steak when you only have a bread knife in your kitchen. Even though it is still technically a knife, it’s not going to be as sharp as an actual steak knife. As such, you’re going to have a rough time in dealing with the piece of meat.


In a similar sense, if you have only one reciprocating blade, and it is meant for only soft types of wood, you’re going to be using your reciprocating saw a lot just to cut one piece of hardwood. Therefore, multiple sets of durable, sharp, and reliable reciprocating blades are a must if you’re serious about getting your wooden projects done with haste and accuracy.


What to Look for When Buying Reciprocating Saw Blades?


  • Dimensions

For the most part, reciprocating saw blades are usually universal unlike jointer knives wherein you must know the model of the wood jointer first before you purchase any model. In the case of reciprocating saw blades, its width and thickness determine its stability.


When you’re going to utilize these blades for casual use, and then look for a blade’s thickness that is about 0.035-inches. Otherwise, if you’re planning to use the blades for heavy-duty operations, then look for models that have a thickness of 0.05-inches so that it doesn’t wobble or bend.


  • Material

Reciprocating saw blades could be found on the market, and there are different types of material available. The material will determine the suitability of how they can be used. The most common material is carbon steel, whereas the most inexpensive are known to be made out of steel. Steel reciprocating blades can be durable and flexible at the same time, so they can bend but won’t break.


  • Number of Teeth

Another factor to consider when looking for reliable reciprocating saw blades is the number of teeth. It is even known as one of the most defining features of the saw blade. With more teeth, it will mean it can create a smoother cut as opposed to blades with a fewer number of teeth.


  • Teeth Per Inch (TPI)

Because reciprocating saw blades are available on the market with varying lengths, just counting the number of teeth has little meaning if you don’t consider the TPI. The TPI on reciprocating saw blades is usually found between 3 and 24.


When looking for proper blades for your reciprocating saw, look for a blade that has at least three teeth in contact with the surface of the material that you’re going to cut.


If you need more details about reciprocating saw blades, please do not miss K&W Tools Co., Ltd. – the company specializes in kinds of woodworking saws and metal cutting saws. Now, send inquiry or contact K&W Tools for more saw blades!



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Transformers are devices that help conduct the transfer of electrical energy between multiple circuits through induction. Thousands of power transformers for residential, industrial, and commercial applications are manufactured in the US every year. The manufacturing of transformers is a lengthy process, and it involves many steps. Production of coils or windings is an important step in the transformer manufacturing. The coils feature several turns of copper wires, which are alternated between layers of insulation. Generally, these coils are wound on the winding machine at high speeds. You may ask how tension contributes to this process. Read on to know more.


Understanding the Importance of Tension in Coil Winding Machine


Consistent tension needs to be applied to the wire during the coil winding process. The coil is usually rectangular, or round shaped. The consistency and quality of the tension applied depends on the shape of the wire. In a round coil, the tension remains consistent during one revolution. However, in the rectangular coils, the wire tension is not consistent and experiences fluctuations. These fluctuations are due to rapidly changing wire path length.


The varying tension may affect the operation of shaft, and produce excessive forces, which may cause machine vibrations and non-uniform coil winding. When this happens, the rectification process is extremely time consuming, and it also may affect the productivity.


Today, various types of tension control machines are available in the market, which helps maintain constant wire tension during high-speed coil winding processes.


Benefits of Wire Tension Control Devices


Tension control devices are classified into three main categories – electronic, mechanical, and computerized control. The computerized control devices provide the best response time. Although the features of these devices may vary across brands, there are certain benefits that they offer. Some of the benefits are summarized below:


  • Helps Achieve Quality Standards: The rising demand for tight tolerance is driving the manufacturing industry to adopt stricter coil winding tension control measures. They are depending on automated tension control devices to meet the rising quality expectations. Many of the advanced tension control devices help them achieve high coil winding quality as well as repeatability.
  • Versatility: Many computerized control devices are designed to allow parameter changes to suit the diameter range. The wire tension control can be set as per the requirement.
  • Helps Maintain Process Efficiency: Most of the wire tension control devices are designed to match the maximum machine speed of the winding machine, which helps minimize wire breakages.


If you have any interest in automatic coil winding machine or other related devices, please do not miss DETZO Co., Ltd. – the company specializes in kinds of high quality automated production lines. Now, contact with Detzo for more details!


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Swaging machines form a workpiece by forcing it into a die to reduce or increase the diameter of tubes or rods. Swaging is done by placing the tube or rod inside a die or dies that hammer together to reduce the diameter of the metal. Swaging machines do not result in the loss of material, only material deformation. Since there is no material loss, swaging machines are commonly used with precious metals. Swaging and swaging machines are commonly considered cold forming processes, but may also be done as a hot forming process in some situations.


Categories of Swaging Machines

Swaging machine processes are typically divided into two categories, tube swaging and rotary swaging. Tube swaging machines use a process similar to drawing wire. These swaging machines can be expanded by placing a mandrel in the tube and applying radial, compressive forces on the outer diameter, which allows the inside shape to differ from the outer, circular diameter.


Cold tube swaging machines are commonly used with aluminum, copper, and thin steel. Rotary swaging, also known as radial swaging, is often a cold working process used to reduce tube diameter, produce a tapered end, or to add a point to a round workpiece. This type of swaging machine uses two or four dies that hammer up to 2,000 a minute. Dies are mounted on the machine’s spindle, located inside a cage containing rollers, which is rotated by a motor. As the spindle spins inside the rotary swaging machine, the dies push out to ride the cage by centrifugal force. When the dies cross the rollers, they push the dies together due to their large size. Like tube swaging, rotary swaging can also create internal shapes inside the tube through use of a mandrel, as long as the shape has a constant cross-section.


Rotary swaging machines are common in two basic types, standard and butt swaging. Butt swaging machines contain sets of wedges that close the dies onto the workpiece by placing them between the annular rollers and the dies, often by use of a foot pedal. These swaging machines allow the piece to be inserted without the dies closing on it. Common applications for swaging machines include attaching fittings to cables or pipes, pipe flaring, sawmilling, fire arms and ammunition, rubber components, automotive components, aerospace applications, agricultural machinery, measurement and adjustment systems, medical devices, optics, tool construction, welding and brazing devices, jewelry manufacture, metal joining and fixtures, and more. Swaging machines may also be used for other, unlisted forming applications.


If you have any interest in swaging machines, Shuz Tung Machinery Industrial Co., Ltd. will be your best choice! The company specializes in producing high performance swaging machinery to meet customers’ demands. Get more details please feel free to check out Shuz Tung’s website and feel free to contact them at 886-4-26831886.


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Waders are waterproof boots that extended from your feet up to your chest, and are made out of neoprene, PVC, rubber, or Gore-Tex. Because they extend up to your chest, waders are often referred to as chest waders. They can be made with the boots attached to them or with stocking feet that you can wear inside your boots. Waders are necessary for duck hunting because we all know how hunting duck can land us in some very muddy and wet situations. Waders keep your clothing and yourself dry so you can better enjoy your hunt.


Types and Uses for Hunting Chest Waders


Hunting chest waders have been in use for duck hunting and other uses for hundreds of years. They first started becoming officially manufactured in the 1850s, and once rubber became popular in the early 1900s, they have been made out of the waterproof and reliable material ever since. In fact, many of the chest waders that we have today are strikingly similar to the ones that duck hunters had back in during World War II in terms of how they were built and the materials used.


There are two primary types of chest waders: boot foot and stocking foot. Boot foot waders have the boot in them already, and in that regard, are more convenient. Stocking foots on the other hand do not have boots as a part of them, but will attach to other kinds of boots.


You might be hesitant to buy a pair of chest waders because you might think that they are only used for duck hunting, and that it’s therefore not worth the expense to buy them if you only go duck hunting once or twice a year. The truth is that chest waders have an extremely large variety of different applications. They can be used not only doing duck and waterfowl hunting, but while riding on ATVs, while gardening, fishing, angling, or while boating. In terms of industry, they can also be worn by those who deal with chemicals, flooding, sewerage, and utilities.


When it comes to duck and waterfowl hunting, however, chest waders are absolutely necessary as they protect your foot from trench foot. Trench foot is alarmingly common in those who spend a lot of time in the water and other wet environments without the right kind of protection or preparations. For people who fish or duck hunt out in the marsh and swamps for hours at a time, chest waders are absolutely necessary for preventing trench foot, hypothermia, and other problems that can arise.


Pacific Eagle Enterprise Co., Ltd. can provide a variety of high quality chest waders for customers. When you have one, in due course, you will very likely find a use for them beyond your normal duck and waterfowl hunting as well. Pacific Eagle hunting chest waders are the best chest waders for duck hunting. Good Luck!



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TPU Meets the Challenge

To meet the manufacturing challenges of a fast-changing world, thermoplastic polyurethane offers outstanding versatility that makes it an excellent material and extremely popular across a range of industries and applications.


TPU is a versatile polymer whose benefits include:

  • Comes in a wide range of hardness grades
  • Excellent color-ability
  • Soft and processable when heated, hard when cooled
  • Maintains soft rubbery feel
  • Will not lose structural integrity when reprocessed multiple times
  • Resistant to abrasion, ozone, and to varying degrees, oil, grease, solvents, chemicals, and abrasion.
  • High elasticity and flexibility
  • High elongation and tensile strength
  • Ranks among the best for load-bearing capability
  • Great for use as a replacement for hard rubber


TPU’s characteristics make it great for extrusion or injection molding and it is a popular material for use in tubing, medical devices, sporting goods, cable, wire and other industrial products. It can also be compounded to create protective coatings or functional adhesives. The material’s desirable chemical and physical properties, excellent mechanical characteristics, and biocompatibility make TPU a great choice for medical applications.


How Did TPU Get Its Start?

German chemist Friedrich Bayer first studied polyurethane chemistry in 1937. To produce early prototypes, Bayer reacted toluene diisocyanate with dihydric alcohols. This is when one of the first crystalline polyurethane fibers Perlon U was developed.


During the days of World War II, when goals for rubber consumption exceeded the rate that natural rubber was being produced, finding a replacement for rubber was a top priority.


The development of elastic polyurethanes began as a program to find this replacement, producing the first polyurethane elastomers in 1940. These compounds could be used as an alternative to rubber that displayed similar properties and strength, without having to source rubber which could not be grown quickly enough to keep up with World War II consumption.


In the United States, in 1953, the first commercial production of a flexible polyurethane foam begun, for foam insulation. Moldable polyurethanes then started being produced during the late 1950s.


Production of Thermoplastic Polyurethane

Thermoplastic polyurethane is created when a polyaddition reaction occurs between a diisocyanate and one or more diols. Thermoplastic polyurethane’s first application was as a replacement for PVC. The appearance and touch of PVC were liked, but the performance was lacking in areas such as flex properties, abrasion resistance, low-temperature properties and others. Thermoplastic polyurethane not only boasts these strengths but maintains a soft rubbery feel and can be produced in a wide range of specifications and colors.


Quality Medical TPU from GRECO

If you need more information about medical TPU, I recommend that you can visit Great Eastern Resins Industrial Co. Ltd. – the company specializes in kinds of industrial adhesives. You can obtain high quality TPU resins at GRECO. Get more details, welcome to contact GRECO at 886-4-23587676.



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Because of their versatility, as well as their ability to speed-up and automate the complex motion sequences, today’s automated computer-controlled machineries, intelligent robots, and majority of the modern automated equipment’s use highly dynamic servo-motors.


Precision planetary gearheads are frequently used in conjunction with such servo motors in order to: balance inertial loading conditions seen during frequent speed cycling sequences, decrease the motor speed, boost the torque, and at the same time, provide a robust mechanical interface for pulleys, cams, drums, and other mechanical transmission components. Actually the servo-motor and gearbox combination became one of the basic “mechatronic” assemblies.


The Planetary (Epicyclical) Gear System as the “System of Choice” for Servo Gearheads

Frequent misconceptions regarding planetary gears systems involve backlash: Planetary systems are used for servo gearheads because of their inherent low backlash; low backlash is the main characteristic requirement for a servo gearboxes; backlash is a measure of the precision of the planetary gearbox.


The fact is, fixed-axis, standard, “spur” gear arrangement systems can be designed and built just as easily for low backlash requirements. Furthermore, low backlash is not an absolute requirement for servo-based automation applications. A moderately low backlash is advisable (in applications with very high start/stop, forward/reverse cycles) to avoid internal shock loads in the gear mesh. That said, with today’s high-resolution motor—feedback devices and associated motion controllers it is easy to compensate for backlash anytime there is a change in the rotation or torque-load direction.


If, for the moment, we discount backlash, then what are the reasons for selecting a more expensive, seemingly more complex planetary systems for servo gearheads? What advantages do planetary gears offer?


High Torque Density: Compact Design

An important requirement for automation applications is high torque capability in a compact and light package. This high torque density requirement (a high torque/volume or torque/weight ratio) is important for automation applications with changing high dynamic loads in order to avoid additional system inertia.


Depending upon the number of planets, planetary systems distribute the transferred torque through multiple gear mesh points. This means a planetary gear with say three planets can transfer three times the torque of a similar sized fixed axis “standard” spur gear system.


Rotational Stiffness/Elasticity

High rotational (torsional) stiffness, or minimized elastic windup, is important for applications with elevated positioning accuracy and repeatability requirements; especially under fluctuating loading conditions. The load distribution unto multiple gear mesh points means that the load is supported by N contacts (where N = number of planet gears) hence increasing the torsional stiffness of the gearbox by factor N. This means it considerably lowers the lost motion compared to a similar size standard gearbox; and this is what is desired.


Low Inertia

Added inertia results in an additional torque/energy requirement for both acceleration and deceleration. The smaller gears in planetary system result in lower inertia. Compared to a same torque rating standard gearbox, it is a fair approximation to say that the planetary gearbox inertia is smaller by the square of the number of planets. Again, this advantage is rooted in the distribution or “branching” of the load into multiple gears meshes locations.


High Speeds

Modern servomotors run at high rpm’s, hence a servo gearbox must be able to operate in a reliable manner at high input speeds. For servomotors, 3,000 rpm is practically the standard, and in fact speeds are constantly increasing in order to optimize, increasingly complex application requirements. Servomotors running at speeds in excess of 10,000 rpm are not unusual. From a rating point of view, with increased speed the power density of the motor increases proportionally without any real size increase of the motor or electronic drive. Thus, the amp rating stays about the same while only the voltage must be increased. An important factor is in regards to the lubrication at high operating speeds. Fixed axis spur gears will exhibit lubrication “starvation” and quickly fail if running at high speeds because the lubricant is slung away. Only special means such as expensive pressurized forced lubrication systems can solve this problem. Grease lubrication is impractical because of its “tunneling effect,” in which the grease, over time, is pushed away and cannot flow back into the mesh.


In planetary systems the lubricant cannot escape. It is continuously redistributed, “pushed and pulled” or “mixed” into the gear contacts, ensuring safe lubrication practically in any mounting position and at any speed. Furthermore, planetary gearboxes can be grease lubricated. This feature is inherent in planetary gearing because of the relative motion between the different gears making up the arrangement.


If you want to learn further details about servo gearheads, you can continue to visit Or you can visit the well-known manufacturer for servo gearhead – Jia Cheng Precision Machinery Co., Ltd. for more information.


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I have some depressing news for you: the mount or stand that came with your monitor probably sucks. Oh, it’ll hold up the screen and stand on your desk…but that’s about it.


Most stock monitor stands that come from manufacturers are barebones, lacking options for both viewing and ergonomics (with a few exceptions for premium and gaming-branded models). Replacing it with a dedicated stand, especially if you use a multiple monitor setup, is an easy way to improve your workspace. Here’s how to pick the right one.


Make Sure Your Monitors Are VESA Compatible

Before we continue: know that in order to use basically any third-party stand or mount, your monitor needs to be VESA compatible. That means having standard mounting holes drilled into the back, typically directly into the steel frame of the monitor it, allowing for any compatible mounts to be screwed in. VESA 100 (with a square hole pattern 100mm wide on each side) is the standard, though some super-sized monitors above 35 inches may have larger requirements. Many smaller, cheaper, or thinner monitors may not be VESA-compatible, and will work only with the custom stands that came from the manufacturer.


Freestanding Mounts: Ergonomics On a Budget

These are simply a replacement for the standard monitor mound or stand—they attach to your monitor at the top and rest on your desk’s surface, just like normal. But replacing your stand with a third-party one can give you more options, including a much greater height (ideally placing the center of the screen at your eye level or just below it), panning and tilting, and even rotating the screen itself into a landscape format.


More elaborate models come with spring-loaded rising mechanisms and integrated cable management, but if you’re looking for a freestanding mount, you are generally want the cheapest option. Single-monitor stands with all the features above can be had for as little as $30.


Side-Clamp Desk Mounts: Maximum Desk Space and Flexibility

An intermediate option is to use a clamp-style mount, which attaches the riser pole or arm to the side of the desk. This gives you the advantage of clearing away desk space immediately beneath the monitor, without having to resort to a permanent or semi-permanent installation. You’ll need a desktop that extends out beyond the legs or support by a few inches—most modern computer desks will do, but older styles with a “boxy” construction may be incompatible. Installation is easy, and requires only a screwdriver and a little elbow grease to secure the clamps in place.


Side-clamp mounts can be simple, with only a few pieces of steel, or elaborate, with multi-jointed arms supported by tightened bolts or even gas-spring mechanisms suspending the monitor over the desk and closer to your face. Some even have pass-through ports for handy extras, like USB and audio. In fact, the construction is simple enough that you can build one yourself if you’re handy with a few basic power tools.


Through-The-Desk Grommet Stands: Heavyweight Champions

For a semi-permanent mount that takes up minimal space on your desk, a through-the-desk mount might just do the trick. These stands utilize a single, heavy-duty bolt that goes through a hole in the desk to secure the weight of both the stand and the monitor. Naturally, this limits your options, as you’ll need to either drill your own hole or have a desk with an existing one, like a standard cable management grommet hole. Of course, there’s no guarantee that these will be in the ideal spot for your monitor mount.


Through-the-desk stands tend to be popular with users who need to mount the maximum amount of weight combined with the minimum amount of desktop obstruction. Double, triple, and quadruple-monitor setups with through-the-desk mounts are common. Some models offer a choice: either a standard bolt mount fixed to the desk, a clamp for the side of the desk, or a huge weighted plate that sits on the desk in a freestanding style to counterbalance the weight of multiple monitors. They tend to be fairly cheap in single-monitor configurations, with prices increasing for more elaborate models.


Wall Mounts: For the Slickest-Looking Setup Around

Wall mounts are a popular option for users who want completely unobstructed desk space and an attractive work area. But thanks to more limited ergonomic positions, the need for a permanent installation on a wall (with a stud), and their unsuitability for most offices and rental properties, they need a lot of prerequisites.


Even so, monitor wall mounts come in a lot of varieties, very much like the same mounts for televisions. The simplest and cheapest mount directly to one spot with no panning or tilting options. More complex variants add simple panning, panning and tilting plus rotation for landscape mode, simple jointed extension arms, and again, multi-joined gas spring stabilization arms. Prices will be about the same as for clamp-on varieties.


One thing that wall mounts can’t handle well is multiple monitors. After two monitors (and not big ones), the weight is too much to mount to a single point, and you’ll have to resort to multiple mounts (on multiple studs).


Multi-Monitor Setups Have Limited Options

If you love the multitasking boost of multiple monitors like I do, your options for third-party mounts will generally get fewer and fewer the more monitors you add. Double-monitor models are available in all of the categories above, but triple-monitor setups are generally not offered in wall-mount options, due to the extra weight. Freestanding mounts (with a heavy steel stand counterweight) and through-the-desk mounts are much more common.


Once you expand to four or more monitors, you more or less have to go with premium, heavy-duty options in the freestanding, through-the-desk, or (less frequently) side-clamp options. And they won’t be cheap: quality steel pipe and arm versions start at around $100, going up to $400 or more for gas spring models.


If you need more choice of gas spring monitor arm, I recommend that you can visit Modernsolid Industrial Co., Ltd. – the company specializes in kinds of LCD monitor arms. Get more details, please do not hesitate to contact Modernsolid at 886-4-26397717.


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What Is CNC Punching?

On July 3, 2018, in Machine, Machine Tools, Manufacturer, by Jasmie K.

Computer numerically controlled (CNC) punching is a sheet metal manufacturing process that is carried out by CNC punch presses. These machines can be either a single head and tool rail (Trumpf) design or multi-tool turret design. The CNC punching machine is basically programmed to move a sheet of metal in an x and y direction so as to accurately position the sheet under the machine’s punching ram ready to punch a hole or form.


The processing range for most CNC punch presses is 0.5mm to 6.0mm thick in a range of materials including steel, zinc, galv, stainless steel and aluminum. The choice of hole punched can be as simple as a circle or rectangle right through to special shapes to suit a specific cut out design. By using a combination of single hits and overlapping geometries, complex sheet metal component shapes can be produced. The machine may also punch 3D forms such as dimples, taptite® screw thread plunges, and electrical knockouts etc on either side of the sheet, which are often employed in sheet metal enclosure design. Some modern machines may have the ability to tap threads, fold small tabs, punch sheared edges without any tool witness marks making the machine very productive within the component cycle time. The instruction to drive the machine to create the desired component geometry is known as the CNC program.


CNC Programming Sheet Metal Components On A CNC Punch Press


CNC programming is the computer aided manufacturing (CAM) side of the CAD/CAM cycle. Information about a design may be presented in a 2D format such as DXF or DWG files or a 3D file format. This information is then used to create the flat sheet metal pressing and assign the correct tooling to create the desired component. The software can also be used to establish the most efficient layout of components from a given size of sheet metal, known as the CNC nest. Obviously, the more components that can be produced from a panel of sheet metal the cheaper each CNC punched component will become. Modern software packages such as Radan® can help to automate this process to achieve the maximum yield from a given sheet metal panel. As a designer of components that will be CNC punched, you do not need to know the exact details of how this may be achieved but it may be useful to bare the following in mind when designing a component that is to be CNC punched from sheet metal.


Things to Remember When Designing For CNC Punching Of Sheet Metal


Hole diameters should ideally be no smaller than the material gauge of sheet metal being CNC punched.


Plunged forms from the parent sheet metal with tapped holes can save money when replacing threaded inserts.


Plunged forms from the parent sheet metal unthreaded ready for taptite® screws can save money on the insertion of threaded inserts and the cost of masking threads if the component is to be painted. These features also enable a self-tapping screw to cut into more material than just the sheet metal gauge reducing the risk of stripping the thread if the screw is over tightened.


Cluster tools can be used to reduce CNC punching time for multiple holes and save money on repeated batches of sheet metal work. The tool can have many individual punches within its form enabling 1000’s of holes a minute to be punched. These CNC tools can be particularly effective when perforated features such as ventilation areas, speaker grilles, LED panels or light fittings are being produced.


Engraving tools can be used to identify parts with part names, issue levels, customer or product names. Often when manufacturing sheet metal fabrications for a customer they want to be able identify the part in their stores area or in production. Sheet metal parts which are then used in the field may need to be identified for spares and servicing; CNC engraving can be a useful solution. If there is a large volume of parts required then a dedicated CNC tool stamp can be used but if there are a range of different sheet metal parts and only small to medium volumes then CNC engraving on our Trumpf 3000R is the most efficient solution. We use a stylus that vibrates 1000’s of times a minute to mark the surface of the material. An added advantage of using a CNC punch press to do this engraving is any changes to the information required by the customer in their part number; issue level etc. can simply be reprogrammed without any cost to you.


Customers are often looking to take product in a batch size that will enable them to get the right price but in doing so they may not have enough space to store the entire product until it’s used up. One solution to this problem can be the simple ‘flat pack’ design. By CNC punching a series of slots in the sheet metal the component can be weakened so it’s easier to bend by hand in assembly. The same principle can be used for earth tags where a quick push with a screw driver is enough for the tag to stand up from the surface of the sheet and allow an earth terminal to be screwed in place.


Toy tags can be used to aid the assembly of small light weight parts instead of screws. These features are often useful when designing reflectors for light fittings. Where no great strength is needed in the finished part and the parent sheet metal can be easily bent with your fingers, toy tags can become a useful design solution. Toy tag assembly can also be a useful method of assembly in production too if you want to receive your parts as a flat pack kit and clip all the parts together yourself. This can also be helpful when you have several designs with common parts that can be stocked and used as each order for a variant is received.


If you need more information about CNC punch press, I recommend that you can come and visit Tailift Co., Ltd. – the company is the leading manufacturer for punch press series. Learn more details, please do not hesitate to contact Tailift at 886-49-2254300.



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Offering a nearly limitless assortment of end properties, epoxy systems enable higher density semiconductor electronics and economical, as well as enhanced reliability, while improving manufacturing efficiencies.


Today’s high performance electronic circuits that are designed into compact assemblies must meet a host of engineering requirements to ensure the reliability of the system. Advanced packaging technologies, such as flip chip assemblies, bare chip mounting, and ultra-fine pitch technology present challenges in terms of securing components to printed circuit boards (PCBs), preventing short circuits, dissipating heat, and protecting delicate components during the manufacturing process. To address these challenges, manufacturers often select environmentally friendly epoxy compounds that achieve high bond strength while providing other application specific benefits.


Epoxy Compounds Perform Multiple Functions

Epoxies are versatile, solvent free polymer compounds that adhere well to many different substrates and produce strong, durable bonds. Formulated through a combination of one or more epoxy resins, a curing agent, and organic or inorganic fillers, epoxies can be modified in a variety of ways to achieve a vast assortment of performance characteristics. Among the properties that can be controlled through each specific formulation are cohesive strength, hardness, durability, flexibility, temperature resistance, viscosity, thermal conductivity, electrical conductivity, moisture resistance, chemical resistance, and resistance to shock and vibration.


Formulations can be engineered to withstand cryogenic conditions or ultra-high temperatures to bond specific materials or to meet stringent industry standards, such as NASA low outgassing specifications, UL 94V-0 flammability specifications, or USP Class VI biocompatibility tests. Many aerospace, defense and electronics companies develop their own specifications, approving specific grades of epoxy compounds made by select formulators.


The extensive array of epoxy formulations are available in a variety of formats and curing characteristics to meet different manufacturing needs–liquids, pastes, films, and solids. A wide selection of one and two-component epoxy compounds are available with cure schedules that range from snap cures, to elevated temperature fast cures, to prolonged cures at ambient temperatures — offering flexibility in terms of processing.


An epoxy system is typically categorized according to its primary function: adhesive, sealant, coating, or potting and encapsulation. In these roles, its main purpose is either to bond two substrates or to protect a substrate from environmental contaminants.


Because of their range of physical properties, epoxies are often engineered specifically to perform additional functions, such as dissipating heat, providing an electrically conductive pathway between substrates, or relieving stress between substrates. The performance and versatility of epoxy compounds can be a tremendous asset to the electronics industry. In this industry, epoxies make it possible to mass produce high density, high performance electronic assemblies, extending the life of electronic circuits, and enhance electronics manufacturing productivity.


Structural Bonding

Because they offer exceptional adhesion to both similar and dissimilar substrates, epoxy compounds are often used for structural bonding in PCB assembly. Die attach adhesives, which are used to bond components directly onto printed circuitry, have good thermal cycling resistance as well as mechanical shock and vibration resistance — protecting fragile die from stress related failures.


Easy to dispense surface mount adhesives are engineered to deliver a consistent dot profile, fill voids, and withstand thermal stresses commonly encountered during wave and reflow soldering processes. Epoxies are excellent insulators, preventing short circuits between adherends; they can also be formulated to be electrically conductive if electrical continuity is desired. Grades are available that provide outstanding adhesion, even under conditions of high humidity and temperature.


Conformal Coatings

Applied as a thin, uniform layer to electronic assemblies during the final stages of manufacturing, epoxy based conformal coatings protect against moisture, chemicals, solvents, abrasion, and mechanical shock and vibration. Designed to conform to the contours of an electronic assembly, these specialized coatings enhance the reliability of electronic assemblies by providing a barrier against the environment while strengthening delicate components and traces.


Numerous grades of epoxy based conformal coatings are available; each offers a different set of property tradeoffs to suit specific application requirements. Grades can be formulated to be thermally conductive or insulative, to resist thermal cycling and thermal shock, to absorb thermal stress, or to have outstanding dielectric properties. They can be engineered to withstand autoclaving sterilization procedures, which is required for many medical electronics applications, or to meet industry standards such as NASA low outgassing specifications and USP Class VI biocompatibility tests. Although they are often opaque, epoxy based coatings can be made clear for opto electronic applications.


Glob Top Encapsulants

Closely related to conformal coatings, epoxy based “glob top” encapsulants protect and support bare die and their wire bonds in chip-on-board (COB) assemblies. Bare die mounting to a PCB or substrate is common in space restricted electronic assemblies, such as handheld consumer and industrial devices. Glob top encapsulants protect vulnerable chips and wire bonds from contaminants while providing the mechanical support necessary to prevent stress related failures during handling and assembly. Although they exhibit many of the same post cure properties as conformal coatings, glob tops provide a thicker, more resilient barrier than do coatings, making them the preferred choice for delicate bare chip devices.


Specifically formulated to be thixotropic, glob tops flow smoothly in response to stress applied during application, but rapidly increase in viscosity. This allows them to easily cover the chip and fill narrow gaps between wires without damaging delicate parts, while preventing them from flowing beyond the desired area. The physical properties of epoxy based glob tops are carefully controlled to suit the COB application. Glob tops are electrically insulative, resistant to moisture and chemicals, and devoid of ionic impurities that may react with moisture to cause corrosion. They are free of solvents that may lead to bubble formation, which can result in penetration by moisture or contaminants. To minimize thermal stress, glob tops contain silica or alumina filler material, which reduces the CTE of the epoxy compound so that it is closer to that of silicon and gold.


Underfill Encapsulants

Epoxy based underfill encapsulants are used to fill in the gaps between “flipped” silicon chips and organic substrates, such as FR 4, relieving thermal stress in the solder bump interconnects on these flip chip assemblies. These specially formulated epoxies mechanically couple the silicon chip and the substrate, forcing them to move in lockstep, while distributing thermal stress across the entire coupled area. As a result, there is very little differential movement between the chip and the substrate during thermal excursions.


Underfill encapsulants also protect the interconnects and the active surface of the chip from moisture and other contaminants, and provide mechanical support for flip chip assemblies. Since they are dimensionally stable, underfills withstand shock while maintaining alignment of the chip and substrate to minimize stress on the solder joints. Without underfill encapsulants, thermal stress caused by the thermal mismatch between the chip and the substrate would be concentrated in the solder joints — resulting in solder fatigue and premature circuit failures. Epoxy based underfill encapsulants have played a key role in the proliferation of reliable high density, high performance semiconductor technology.


Potting and Encapsulation

Transformers, inductors, power supplies, connectors, sensors, relays, and other electronic components are often encased in epoxy based potting and encapsulation compounds to protect them against shock and vibration while providing a barrier to moisture and other contaminants. These compounds feature very low viscosity, allowing them to flow easily during application so that they completely cover the target surface; and a variety of other physical characteristics, including electrical insulation, thermal shock resistance, and low coefficients of thermal expansion (CTE). Different grades are optimized for specific applications, offering high voltage insulation or cryogenic serviceability, or meeting specifications such as NASA low outgassing, USP Class VI biocompatibility, and UL 94V 0 flammability.


Films and Preforms

Solid epoxy adhesives, sold as small sheets of film or custom cut preforms, offer uniform bond lines with minimal squeeze out — benefits that are critical to certain applications in the electronic industry. When bonding heat sinks and other large surfaces, solid films are preferred because it is difficult to achieve a uniform bond line over a large surface area using liquid adhesives. For applications in which squeeze out may pose a problem, such as lid sealing or bonding substrates located near a channel through which ink or another liquid must flow, films and preforms are a better choice than liquid adhesives.


Epoxy films are manufactured as premixed, frozen adhesive films or as partially cured B staged adhesive films. While they differ in terms of storage, working life, and cure schedules, both types of films can be engineered to offer a variety of physical properties to meet specific application needs. Additionally, B staged adhesives can be applied in one stage of the manufacturing process and cured to completion in a later stage — even at a different location — presenting opportunities for process efficiencies.


Versatile Epoxies Improve Reliability of Electronic Systems

Epoxy based adhesives, encapsulants, and sealants play a significant role in the manufacturing and assembly of modern electronic systems ranging from tiny, implantable medical electronics to massive space and defense systems. Versatile epoxy based compounds can be engineered for performance in a variety of harsh environments, including vacuum, cryogenic, and ultra-high temperature conditions, under conditions of thermal and mechanical stress, and in the presence of moisture, chemicals, and other contaminants. Because of their ability to prevent short circuits, extend joint life, and prevent stress related failures, epoxies are widely recognized for their contributions to the outstanding reliability and longevity of modern electronic systems. Offering a nearly limitless assortment of end properties, epoxy systems enable higher density semiconductor electronics and economical, reliable, high performance electronic devices, while improving manufacturing efficiencies.


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