In the process of our processing, it is a normal phenomenon to encounter problems, because during the operation of the equipment, there will be wear between the parts. If there is wear, the fault will occur naturally. If the fault occurs more, it will certainly affect the service life of the equipment. So if we want to extend the service life, we must do well in the maintenance The problem must be solved in time, so let’s understand what causes the die punch fracture?
- In the blanking process, the punch is subjected to unbalanced lateral pushing force, which makes the punch bend or even break. This kind of force mainly includes the following aspects:
① When rubber is used as elastic unloading part, rubber compresses to produce lateral expansion and extrudes punch to one side due to improper assembly.
② The imbalance of spring force in the unloading device makes the unloading plate incline, which makes the punch bend and break when it is pushed by transverse force.
③ The position of the big punch and the small punch are close. In the blanking process, the material around the big hole deforms, and the small punch may break.
- If the ratio between the diameter of punch section and the length of its working part is improper, the punch may be broken.
- When a small punch is used to punch thick and hard materials, the punch is easy to break, and the diameter of common punch should be larger than the material thickness of metal stamping parts. Otherwise, punch sheath structure should be adopted.
- Die fracture is also often caused by incorrect design and manufacturing, small fillet radius at corner of step punch, rough machining, no edge mark and grinding crack, decarburization layer caused by forging is not completely removed by machining, carbide segregation is not improved during forging of high alloy tool steel, improper heat treatment process and so on. Especially for cold extrusion punch.
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