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The stamping dies designed according to different stamping processing materials are different, and they basically complete a product or semi-finished product through multiple steps of stamping processing.

Different steps require different shapes and specifications of cemented carbide punching pins, which is designed to be customized production of special-shaped punching pins for supporting stamping dies. Cemented carbide special-shaped punching pins can be divided into different shapes and different uses:

1. The guide punch is also called the guide punch for short. According to the needs of the press, it can have various shapes, such as A type B type HB type TAPP type T** P type and so on.

2. The son-mother punch is also called the son-mother punch for short. There is a small protrusion on the top of the punch. I don t know the origin of the name, perhaps because of the protrusion on the top of the punch. Letter punching needles can be divided into standard type A type JS** type and other models.

3. There are also drawn-tooth punching needles, inspection tips, hexagonal punching needles, oval punching needles, forming punching needles, fan-shaped punching needles, special-shaped punching needles, high-speed steel punching needles, tungsten steel punching needles, etc.

The focus of customized hard alloy punching needles is also designed to the accuracy and consistency of the product. The physical parameters are as follows:

1. CO content: 10%-20%.

2. Density g/cm3: 14.0～14.5.

3. Hardness: 87-92.0HRA.

4. Grain size: 0.6-1.2um.

5. Bending strength: 4000MPa.

6. Elastic modulus GPa: 490.

7. Thermal expansion coefficient 10-6/0C: 5.4. 8. The dimensions and specifications of the cemented carbide punch are customized according to the drawings, and the accuracy is required to reach ±0.002.

Carbide punching needles used in high-precision molds require very high accuracy and product consistency. Each punching needle required for mass production must strictly comply with the dimensional accuracy tolerance requirements to maximize the service life of the mold.

As a cemented carbide punching pin used with precision molds, the consistency of the product is a key factor, which will directly affect the service life of the mold and the dimensional accuracy of the product.

Stamping die work is continuous operation, and the service life requirement of the punching needle has become the focus. Carbide punching needles should choose different alloy materials according to the material and thickness of the stamping. Generally, the thicker the stamped product, the lower the hardness and the better the toughness of the carbide.

The harder the material, the hard alloy should be a slightly lower hardness model, which can effectively prevent the punching needle from being punched out. For punching thinner plates, or those with low hardness, for hole processing of this product, cemented carbide punching needles can be made with higher hardness, which can increase the service life of the punching needles.

In addition to the choice of cemented carbide materials, one of the important factors affecting the quality and service life of the punching pin is whether the gap between the cold punching dies is uniform. In the process of assembling the cemented carbide punch pin, the gap between the convex and concave dies must be consistent.

In order to ensure that the gap between the punch and the die is uniform, you must first determine the position of one of them (punch or die) according to the requirements of the drawing, and then use the piece as a reference to align the gap to determine the exact position of the other piece

Some stamping dies are assembled with many hard alloy punches at one time, which requires the scientific and rationality of the die design.

When assembling the punching pin, there are mainly the following methods to control the uniform gap between the punch and the die:

1. Light transmission method: Place and install the upper and lower molds, illuminate them with a lamp or flashlight, and observe the light transmission in the blanking hole of the lower mold.

2. Gasket method: Place a copper or paper sheet with uniform thickness around the cutting edge of the concave die, and insert the convex mold into the corresponding concave mold hole to observe the tightness of the convex mold and the gasket. degree. Gently tap the fixed plate with a hand hammer until the protrusion and the gasket are the same tightness. After proper adjustment, tighten the upper mold.