In the field of metal manufacturing, metal stamping is an important processing technology widely used in various industries. For Kailai Machinery, which was founded in 1996 and focuses on metal stamping, stretching, welding and common surface treatment, especially for custom metal parts manufacturers with rich experience in stamping, it is well aware of the key impact of punch selection on stamping product quality and production efficiency. When repairing metal stamping products of different materials, how to accurately select the right punch is the key knowledge that every practitioner needs to understand in depth.

Key points for selecting punches when stamping metals of different materials

Stamping stainless steel

Stainless steel has high hardness and good toughness, and has extremely high requirements for the wear resistance and strength of the punch. Common punch materials include cemented carbide, powder high-speed steel, etc. Cemented carbide is composed of hard carbide particles such as tungsten carbide and metal binder (such as cobalt). The hardness can reach HRA89-93. It has excellent wear resistance and compressive strength. It can maintain stable performance even at high temperatures, which is very suitable for stainless steel stamping. Powder high-speed steel, such as ASP23, ASP30 and other models, is made by powder metallurgy process. The internal structure is uniform and contains a variety of alloy elements. It can effectively resist the friction and wear during stainless steel stamping. It has good toughness and can withstand a certain impact force. It is suitable for high-speed stamping of stainless steel.

Stamping aluminum alloy

Aluminum alloy is relatively soft in texture, but has high ductility. When stamping aluminum alloy, the punch material needs to have a good surface finish to prevent the aluminum alloy material from adhering to the punch and affecting the stamping quality. High-speed steel is a more commonly used punch material. Its hardness and toughness are relatively balanced, and the price is relatively moderate. At the same time, in order to further improve the wear resistance and anti-adhesion of the punch, the punch can be surface treated, such as titanium plating. The friction coefficient of the punch surface after titanium plating is reduced and the hardness is increased, which greatly improves the service life.

Stamping copper

Copper has good electrical and thermal conductivity, is soft and has high viscosity. When stamping copper, the punch material should focus on the uniformity of the structure and the resistance to cracking, so as to avoid the wear of the punch due to friction caused by small internal cracks during high-frequency movement, and the viscosity of the copper material affecting the appearance of the product. For example, TRNM-007 material has good uniformity of structure, no carbide segregation, and toughness more than 4 times that of DC53. After multiple forgings, the toughness in all directions is consistent, which can effectively solve the problem of copper punching punch sticking.

Other factors affecting the selection of punches

In addition to the material of the metal being stamped, there are other factors that affect the selection of punches.

1. Stamping thickness: The thickness of the stamped material is different, and the strength requirements of the punch are also different. The thicker the material, the greater the punching force required during stamping, and the punch needs to have higher strength and toughness to withstand the pressure to prevent the punch from breaking. For example, when stamping thicker stainless steel plates, you may need to choose a carbide punch with better hardness and toughness.

2. Stamping accuracy requirements: If the precision requirements for stamping parts are very high, high-precision punches should be selected to ensure the accuracy and stability of the stamping dimensions. High-precision punches are more sophisticated in manufacturing processes and can meet the stamping needs of products with strict dimensional tolerances.

3. Stamping shape and size: Determine the shape and specifications of the punch according to the shape and size of the stamping parts. Stamping parts with complex shapes may require customized punches of special shapes to ensure uniform deformation of the material during the stamping process and the quality of the stamping parts.

4. Production batch: If the product needs to be mass-produced in the later stage, priority should be given to punch types with good wear resistance and long life. Although the initial purchase cost of such punches may be high, it can reduce the frequency and cost of replacing the punches, further save the time cost and labor cost of the upper and lower dies, and be more economical in the long run.

As a professional metal parts manufacturer, Kailai Machinery, with many years of industry experience, can accurately select the appropriate punch according to the different metal stamping needs of customers, and use exquisite stamping technology to provide customers with high-quality customized metal parts. Whether it is metal stamping products made of different materials such as stainless steel, aluminum alloy or copper, we are confident that through scientific punch selection and advanced processing technology, we can meet customers' requirements in product quality, precision and production efficiency. If you have a need for customized metal parts, please feel free to contact us, we will serve you wholeheartedly.