Today, precision casting manufacturers will take you to learn about the forging knowledge of stainless steel castings. Firstly, when forging stainless steel castings, it is necessary to first consider the forging temperature of the stainless steel forging, then consider the temperature drop during the contact process between the billet and the working die, and pre heat the working die. For alloys with high deformation difficulty, slow deformation should be used as much as possible, and the deformation amount per stroke of the hammer or press should be controlled at around 20%. For speed sensitive materials, temperature effects should be considered when selecting deformation speed.

The plasticity of closed die forging is better than that of open die forging, and the plasticity of open die forging is better than that of free die forging. In the free forging sequence, the drawing length of the anvil and the ring upsetting are better than those of the flat anvil and the ring less upsetting.

When the stretching length of the material is low, an appropriate feed ratio should be selected. If the feed ratio is too small, deformation is concentrated in the upper and lower parts, and the center cannot penetrate, generating tensile stress along the axial direction, leading to internal transverse cracking. During the upsetting process, soft lining is often used for upsetting or upsetting (used for forging wafers) to improve deformation non-uniformity and prevent surface cracks.

When considering the forging process, especially the final heat forging, it should be avoided to perform at the critical deformation level to avoid the occurrence of coarse grain structure. Specifically, metals at high temperatures have good plasticity and low resistance to deformation. They should be forged with large deformations, and the degree of deformation is far greater than the critical degree of deformation. In low-temperature correction, small deformations below the critical deformation degree are used for local beneficiation.