A stamping die is a special, one-of-a-kind precision tool that cuts and forms sheet metal into a desired shape or profile. The die's cutting and forming sections typically are made from special types of hardened steel called tool steel. Dies also can contain cutting and forming sections made from carbide or various other hard, wear-resistant materials.
Stamping is a cold-forming operation, which means that no heat is introduced into the die or the sheet material intentionally. However, because heat is generated from friction during the cutting and forming process, stamped parts often exit the dies very hot. The main components of a stamping tool usually consist of the punch and the female die (the matrix), sometimes with an additional pressure pad to build up compressive strength in the workpiece. Tool and die makers are a class of machinists in the manufacturing industries who make, fixtures, dies, molds, machine tools, cutting tools, gauges, and other tools used in manufacturing processes.
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![]() Many punch manufacturers choose Wire EDM, their reason is simple - wiring is easy, and cheap and internal radii are eliminated by making tiny undercuts written into the cutting program. Risks with WEDM The finish on wired carbide has surface microfractures, which is workable for a full-sized punch but it's bad news for small, highly stressed areas of a small punch working at up to 800 strokes a minute. Breakages are unpredictable but not surprising. Grinding Advantages We are experts in surface grinding carbide punch and we know that grinding gives a surface finish entirely free from any microfracture defects. With this level of support, our die makers can concentrate on what they do best - producing high-quality stamping parts. ![]() How do tungsten and tungsten carbide differ? The most obvious difference is that tungsten refers to the individual metal, while tungsten carbide is an alloy of tungsten and carbon, a chemical compound containing tungsten and carbon atoms. Tungsten Carbide Tungsten carbide is often used to make punches as press die tools. Small quantities of other metals such as nickel and titanium might be added for specific properties. Its properties are a high density and a high melting point of about 2900℃, boiling point of 5986℃, a high hardness as well as high performance of electric and thermal conductivity. At normal temperatures, their calorific and other physical stability is outstanding. With a high hardness of about 2500 Vickers hardness and elastic parameters up to 700 Gpa. Tungsten carbide is much harder and tougher than tungsten, so tungsten carbide is used to make cutting tools for machining, and precision tungsten punch, precision carbide punch, TiCN Coated Punch for metal stamping, automotive, aerospace, tooling and die industries. Tungsten Pure tungsten provides good arc stability for AC sine wave welding, so it is often used as an electrode for tungsten inert gas welding. Tungsten metal has been used for over 100 years as a filament in electric light bulbs. It is also used as an important additive to steel which enhances its hardness and strength. Tungsten is extracted from two minerals, wolframite, and scheelite. One method of finding Scheelite ore is by its’ability to fluoresce a blue fluorescent color when illuminated with a short wave ultraviolet light. Tungsten and Steel The addition of tungsten makes steel stronger. Tungsten increases steel’s hardness and cutting capacity. Tungsten is the primary alloy component in steels used for tools and construction. Steel alloys with tungsten are used for cutting and making metal components. As such, it is important that these steel alloys possess excellent hardness properties over a wide range of temperatures.ere to edit. ![]() Carbide punch has extremely high hardness up to 92HRA, high corrosion resistance, wear resistance, and its coefficient of expansion are better than any other kind of steel, but it also has poor toughness. Therefore, to improve the performance of tungsten carbide punch we should improve its toughness aspects. Carbide VS Steel Steel alloy is remarkably less expensive. But how important is machines’ up time to you? You are perhaps spending about 1/3 of the cost on steel components for your machines compared with carbide punches. However, do you know how much time longer tungsten carbide lasts than steel? almost 100 times as often! So if one of the carbide punches costs $300 and a steel punch costs $100, for a two-week continuously working machine you are spending $300 for carbide. You are spending more than $10,000 for steel components! which would you choose? Downtime To service your stamping machine, you will be taking your machines offline several times a day. If tungsten carbide punch is used instead, you wouldn’t have to have your machinery down, no need to pay the service costs, and your productivity will be highly improved. Tungsten Carbide Punch Specialist Dongguan JLS Precision Mold Parts Co., Ltd. has proven expertise in precision grinding tungsten carbide punch, die punches and buttons gained from over 20 years of experience supplying to toolmakers, stamping die makers, aerospace and automobile industries. ![]() Titanium nitride (TiN) (known as tinite) is a super hard ceramic material, mainly used as a coating on tungsten carbide, titanium alloys, HSS, carbide, and aluminium components to improve surface properties. Applied as a thin coating, Titanium Nitride is used to harden and protect cutting and sliding surfaces, for decorative purposes (due to its golden appearance), and as a non-toxic coating for medical implants. In most cases a coating of thinner than 5 micrometres (0.00020 in) is applied. Properties TiN has a hardness of 1800–2100 Vickers , a modulus of elasticity of 251 GPa, a thermal expansion coefficient of 9.35×10−6 K−1, and a superconducting transition temperature of 5.6 K. TiN will oxygenate at 800℃ in a normal air. It is chemically stable at 20 °C, according to laboratory experiments, but can be slowly attacked by concentrated acid solutions with rising temperatures. According to the substrate and surface finish, TiN have a wear property ranging from 0.4 to 0.9 against another TiN surface (non-lubricated). Uses A known usage for TiN coating is corrosion resistance on machine tooling, such as punch tools, drill bits and milling cutters, often improving their lifetime. ![]() What is Tungsten Carbide and the Beneficial Properties? Tungsten carbide (WC), also called cemented carbide, is a compound material produced by a process called powder metallurgy (PM). The process mixes the tungsten-carbide powder with a binder, normally cobalt or nickel. The mixture is compacted in a mold and then sintered in a furnace to convert the powder into a solid block via using heat and pressure. The word ‘cemented’ refers to the tungsten-carbide particles being mixed with the metallic binder matrix and cementing them together by sintering. The carbide industry normally refers to this material simply as carbide, but the terms solid carbide, tungsten carbide, and cemented carbide are used also frequently. Carbide materials are used in metal-stamping dies developed for long production life. They possess high compressive strength, resist deflection and retain their hardness values at high temperatures, a physical property especially useful in high-speed cutting, punching, and forming. Some processes may only be possible with tungsten carbide punches, such as punching small-diameter holes in hard, tough materials. Beneficial Properties of Carbide Hardness should be the most beneficial property of cemented carbide for metal-stamping. hardness is the most important physical property when it comes to wearing resistance. However, hardness alone does not determine the success of the carbide grade in a particular wear application; Other significant factors include cobalt content and grain size. Hardness for cemented carbide usually is expressed in terms of Rockwell A (HRA) or Vickers values. Traditional tool steels, such as HSS, are expressed using the Rockwell C (HRC) scale. A traditional tool steel heat-treated and tempered to 62 HRC still remains relatively soft when compared to a 6-percent cobalt-grade carbide with a hardness value of 92 HRA. Compressive strength is another important property of cemented carbide. Forgeable materials may plastically deform without fracturing when overloaded in compression. Brittle materials under similar conditions tend to fail suddenly. Cemented carbide shows quite high compressive strength when compared to most other materials. The compressive strength of cemented carbide increases with decreasing binder content and decreasing grain size. Tantalum carbides (TaC) reduce interface friction between the tooling because the tantalum works as a built-in lubricant within the microstructure, serving as an anti-galling agent. Dongguan JLS Precision Mold Parts Co., Ltd is a Chinese manufacturer of extremely hard tungsten carbide punches, precision tungsten punch, and punches and bushings, carbide punch with excellent wear resistance, tight tolerance up to 0.001mm, and corrosion resistance. ![]() The definition of Punching: a forming process that uses a punch press to force a tool, called a punch, through the workpiece to make a hole by shearing. Punching is applicable to a wide range of materials including sheet metal, paper, vulcanized fiber, and some kinds of plastic sheets. The punch often passes through the work into a die. Normally, the punching equipment consists of two tool parts – one support for the punches and one for the dies. While the punches enter the dies, the material is being sheared cut. Punching is usually the most cost-effective method for creating holes in sheet materials. The process of a specially shaped punch is used to create multiple usable parts from sheet material is called blanking. In metal forging applications the work is often punched while hot, which is called hot punching. When the metal fracture is complete and metal is not removed but stayed in hole, the operation of punching is called slugging. What is the Process? A punch and die is usually made of tungsten carbide or hardened steel alloy. A die is located on the opposite side of the workpiece and supports the material around the perimeter of the hole and helps to localize the shearing forces for a cleaner edge. There is a small amount of clearance between the punch and the die to avoid the punch from sticking in the die and so less force is needed to make the hole. The amount of clearance needed up to the thickness, thicker materials requires more clearance, however, the clearance is always less than the thickness of the workpiece. The clearance also depends on the hardness of the workpiece. The punch press forces the punch through the workpiece, producing a hole that has a diameter almost the same to the punch, or slightly smaller after the punch is removed. All tough materials stretch to some extent during punching which often makes the punch stick in the workpiece. In this case, the punch must be physically pulled back out of the hole while the work is supported from the punch side, and this process is known as stripping. The hole walls will indicate the burnished area, rollover, and die break must be often processed further. The slug from the hole falls through the die into a container to either dispose or reuse it. Dongguan JLS Precision Mold Parts Co., Ltd is a professional punch and die, toolmaker, which made of super-hard tungsten carbide (88-92HRA). The punch, also being called as tungsten mold components, precision tungsten punch, and TicN Coated punch is of extremely tight tolerance, excellent wear resistance, and corrosion resistance. #carbidetools #carbidedies |
AuthorAbby Zhang Archives
August 2021
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