How to choose punching when forging?

Edging and punching can be done in hot or cold conditions. According to cutting and punching forging temperature can usually be divided into hot edge, hot punching and cold cutting, cold punching. Hot edge and punch are carried out immediately after die forging using the waste heat of the forging. Cold cutting and cold punching are done after the forging is completely cooled.

When compiling the process, it is necessary to choose the hot edge or cold cut edge according to the well-known geometric shape, size and material, as well as workshop equipment, etc. The specific principle is:



1. Forgings with more than one die and weight within 0.5Kg are generally cold cut or cold punched.



2. For forgings with carbon content higher than 0.45 and weight less than 1Kg, cold cutting or cold punching can still be used.



3. The carbon content is higher than 0.45, but in line with the first principle of forgings, in order to avoid cracks, should be normalized after treatment, and then cold cutting or cold punching.



4. For large forgings, hot edge and hot punching are generally used regardless of the steel size of the material.



5. When thermal correction and bending process are needed after cutting or punching, hot edge and hot middle hole should be used.

6. When the skin is thick and the punch section is small, thermal punching should be considered to prevent the punch from bending or breaking.