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Name：Rebecca Dong
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Prevent the heat treatment deformation of precision mold. |
In the process of heat treatment, precision mould will produce deformation, often in order to prevent this kind of bad phenomenon, as long as the master its deformation law, analyzing the reasons, using different methods to prevent mold is able to reduce the deformation, also can control. Generally speaking, the heat treatment deformation of precision complex dies can be prevented by the following methods.
(1) fair selection. For sophisticated mould should choose the micro deformation of the steel material (e.g., air quenching steel), the carbide segregation severe reasonable casting and die steel and solid solution was carried out on the large and cannot be cast die steel can double quenching.
(2) the die structure design for justice, not too wide, thickness of appearance wants is symmetrical, the mould deformation is to grasp the deformation law of machining allowance, reserved for large, complex precision mould can use composite structure.
(3) precision and complex molds shall be pre-heat treated to eliminate residual stresses generated during machining.
(4) reasonable selection of heating temperature and control of heating speed. For precision and complicated molds, slow heating, preheating and other balanced heating methods can be adopted to reduce mold heat treatment deformation.
(5) in the condition that the mold hardness is ensured, the pre-cooling, fractional cooling quenching or tempering process shall be used as far as possible.
(6) in the case of precision and complicated mould, the quenching and quenching after quenching and quenching shall be adopted as far as possible.
(7) the precision of the mold can be controlled by preheat treatment, aging heat treatment and tempering nitride heat treatment for some precise and complicated molds.
(8) when repairing the defects such as mold, pores and abrasion, the small repair equipment, such as cold welder, shall be selected to avoid the deformation during the repair process.
Heat treatment process operation there are many ways, including such as blocking, bind hole, mechanical fixation, fitting for heating method, the accurate choice of direction of the mold cooling and cooling medium in the direction of motion, etc., reasonable tempering heat treatment process are also effective measures to reduce deformation of precision and complex mould.
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Down：Causes and preventive measures of mold heat treatment defects.
Up：The ratio of injection speed to injection molding is important. |
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