Prevention of heat treatment deformation

The deformation causes of precision and complex dies are often complex, but as long as we grasp the deformation law, analyze the causes, and adopt different methods to prevent the deformation of dies can be reduced, but also can be controlled. Generally speaking, the following methods can be used to prevent the heat treatment deformation of complex and complex dies.
(1) reasonable selection. For precision and complex dies, micro-deformed die steels (such as air-quenched steel) with good materials should be selected. Die steels with serious carbide segregation should be reasonably forged and quenched and tempered. For larger and non-forgeable die steels, solid solution double-refining heat treatment can be carried out.
(2) The design of the die structure should be reasonable, the thickness should not be too different, the shape should be symmetrical, the deformation law should be grasped for the large deformation die, the machining allowance should be reserved, and the combination structure can be used for the large and precision complex die.
(3) precision complex dies should be pre heat treated to eliminate residual stresses during machining.
(4) Reasonable selection of heating temperature, control of heating speed, for precision and complex molds can be taken to slow heating, preheating and other balanced heating methods to reduce mold heat treatment deformation.
(5) under the premise of ensuring mold hardness, precooling, grading cooling quenching or temperature quenching are used as far as possible.
(6) Vacuum heating and quenching and cryogenic treatment after quenching should be adopted as far as possible for precise and complicated dies and moulds as conditions permit.
(7) Precision of some precision and complicated dies can be controlled by pre-heat treatment, aging heat treatment, quenching and tempering nitriding heat treatment.
(8) When repairing the defects such as sand holes, air holes, wear and tear, cold welding machines and other repair equipment with little heat effect are selected to avoid deformation during the repair process.
In addition, the correct heat treatment process operation (such as plugging hole, binding hole, mechanical fixation, suitable heating method, correct choice of cooling direction of the mold and the movement direction in the cooling medium) and reasonable tempering heat treatment process are also effective measures to reduce the deformation of precision and complex mold.
Surface quenching and tempering heat treatment
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