Precision Mould Heat Treatment Deformation and Prevention
Heat treatment of precision molds is an important link in the production of precision molds. It not only affects the comprehensive performance of precision molds, but also affects their service life. It is beneficial to observe the following issues in the heat treatment of precision molds.
First, under normal circumstances, it is ideal to prepare the molecular connection state. The molecular connection state is condition of the internal mechanical structure,It refers to the shrinkage, quench hardening, transformation temperature and time of the material, etc.. The ideal state is to obtain the optimum position.
Second, after normalizing, alloys are usually used for quenching, and quenching temperature is one of the main factors to affect the compressive strength of the mould,The correct choice of quenching temperature is the key to obtain the desirable structure state and performance.
Third, in order to reduce the internal stress of precision moulds and improve plasticit, tempering must be done after quenching and tempering, so that to obtain a preferable internal organization. It can improve the toughness and fatigue strength of molds,At the same time it can reduce the probability of the craft deformation and crack.
Fourth, in the precision mould heat treatment process, it is important to adjust the deformation of precision molds.,Since it affects the shape and size accuracy of moulds,It is necessary to consider the extent of expansion and contraction during the heat treatment process,so that to reduce the mould under normal temperature and not cause the product to be scrapped.
In summary, the main reason of heat treatment deformation is the temperature inequality of key parts,Therefore, before heat treatment, we can pay more attention to the strict heat treatment process control,especially for the temperature and cooling process of precision moulds, so as to effectively prevent deformation.
Heat treatment is an important step for precision molds, whether before or after heat treatment or during the heat treatment process, attention should be paid to to each step of precision molds heat treatment from material selection, hardening, quenching and tempering, to achieve the best best performance accurate parameters , at the same time to extend the life of precision molds.
