1, Reasonable material selection. Micro-deformed die steel with good material should be selected for the precision messy die of straight seam steel pipe, reasonable casting and tempering heat treatment should be carried out for the die steel with serious carbide segregation, and solid solution double refinement heat treatment can be carried out for the large and uncastable die steel. Reasonable selection of heating temperature and control of heating speed, slow heating, preheating and other balanced heating methods can be used to reduce the heat treatment deformation of the mold for precision messy mold.
2. Correct heat treatment process operation and reasonable tempering heat treatment process are also useful methods to reduce the deformation of precision messy mold. The deformation cause of precision messy mold is often messy, but we only need to master its deformation rules, analyze the causes of its occurrence, and choose abnormal methods to avoid mold deformation can be reduced and controlled.
3, precision messy mold to pre-heat treatment, eliminate the remaining stress in the process of mechanical processing. For the precision messy die, vacuum heating quenching and cryogenic treatment after quenching should be used as far as possible. Under the premise of ensuring the hardness of the die, the process of precooling, fractional cooling quenching or temperature quenching is selected as far as possible.
4. Mold planning and description should be reasonable, thickness should not be too different, shape should be symmetrical, deformation rules should be mastered for molds with large deformation, processing allowance should be reserved, and combination planning can be selected for large and precise messy molds. Pre-heat treatment, aging heat treatment, tempering nitriding heat treatment can be used to control the precision of some precision messy mold. In repairing mold sand hole, air hole
5, Wear and other defects, choose cold welding machine and other equipment with small thermal influence to avoid the occurrence of deformation in the repair process.
Post time: Feb-20-2023