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Preventing heat treatment deformation of precision injection molds

Release Time:

2023-05-26 10:40

In the heat treatment process, precision injection molds often produce deformation, in order to prevent this bad phenomenon, as long as to grasp the deformation of the law, analyze the reasons for its production, the use of different methods for the prevention of mold deformation is able to reduce the deformation is also able to control. Generally speaking, the heat treatment of precision injection mold deformation can take the following methods of prevention.
(1) fair material selection. Precision injection molds should choose the material good microdeformation mold steel, carbide precipitation severe mold steel should be fair casting and carry out, on the larger and can not casting mold steel can be solid solution double refinement heat treatment.
(2) mold structure design to be fair, thick and thin not too disparate, the shape should be symmetrical, for the deformation of the larger mold to grasp the law of deformation, reserved processing allowance, for large, precision injection mold can be used in a combination of structures.
(3) Precision injection molds should be pre-heat treatment to eliminate residual stresses generated during machining.
(4) fair choice of heating temperature, control the heating speed, for precision injection molds can take slow heating, preheating and other balanced heating methods to reduce mold heat treatment deformation.
(5) In order to ensure the hardness of the mold under the conditions, try to use pre-cooling, graded cooling quenching or temperature quenching process.
(6) for precision injection molds, in the case of the premise permits, as far as possible, the use of vacuum heating quenching and quenching of the deep cold treatment.
(7) for some precision and complex molds can be used in advance heat treatment, aging heat treatment, tempering nitriding heat treatment to control the accuracy of the mold.
(8) in the repair of mold blisters, pores, wear and other defects, the use of cold welding machine and other thermal impact of the repair equipment to avoid the repair process of deformation.
Heat treatment process operation has many methods, specifically including such as plugging holes, binding holes, mechanical fixation, appropriate heating methods, accurate selection of the cooling direction of the mold and the direction of movement in the cooling medium, etc., fair tempering heat treatment process is also an effective measure to reduce the deformation of precision injection molds.

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