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Deformation of die during heat treatment
    1, in order to ensure mold hardness, we should use pre cooling, grading cooling quenching or temperature quenching as far as possible.
2. Suggestions for heat treatment in Changping. For precise and complex moulds, if the conditions permit, the nitriding heat treatment plant proposes to adopt vacuum heating quenching and cryogenic treatment after quenching as far as possible.
3, for some sophisticated and complex dies, pre heat treatment, aging heat treatment, quenching and tempering heat treatment to control mold accuracy can be used.
4. When the nitriding heat treatment plant repair the defects of mould sand hole, hole, wear and so on, the heat treatment equipment such as cold welding machine, such as cold welding machine, is selected to avoid the deformation in the repair process.
5, the design of the mold structure should be reasonable, the thickness is not too wide and the shape should be symmetrical. The experts express that the deformation law should be mastered for the larger deformed mould, the allowance for processing is reserved, and the combined structure can be used for the large and precision complex moulds.
6, precision complex mold should be pre nitrocarburizing to eliminate residual stress during machining.

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