Eight performance requirements on mould making
The manufacturing techniques should have relatively low resistance to deformation during the hot forging process. Good plasticity and wide forging temperatures are required. The tendency of forge cracking, cold cracking and net carbide should be low.
The temperature range of spheroidizing annealing should be wide while the annealing hardness should be low. At the same time, the fluctuation range has to be small and the rate of spheroidization has to be high.
During the cutting process, big cutting parameters and low cutter consumption can decrease the surface roughness of the products.
4.Oxidation and decarburization sensitivity.
When heating in high temperatures, the oxidation performance of materials should be great and the decarburization speed should be slow.
After quenching, the product can obtain a uniform and high surface hardness.
After quenching the product can get a deeper hardening layer which can be hardened easily by mild quenching media.
7.Tendency of deformation and cracking.
In conventional quenching, the change of volumes should be slight, with warp shapes and slight distortion. During this process, tendency of abnormal deformation should be low. It is great that the sensitivity of conventional quenching cracking is low. It should be insensitive to quenching temperatures and shapes of work-pieces.
The loss of grinding wheel should be small. No burn limit and the cutting parameters are large. Being insensitive to the quality of grinding wheels and cooling conditions. Cases like grinding bruise and grinding cracks should be less.