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精密模具的热处理变形有效预防措施

来源:http://www.jnhjgs.cn/news/13.html发布时间:2017-02-21

(1)公道选材。对精密复杂模具应选择材质好的微变形模具钢(如空淬钢),对碳化物偏析严峻的模具钢应进行公道铸造并进行,对较大和无法铸造模具钢可进行固溶双细化热处理。
(1) fair selection. Sophisticated molds should choose good material of the micro deformation of die steel (such as air quenched) of mold steel, carbide segregation serious should be fair and large and casting, to cast die steel can be refined solution and double heat treatment.
(2)模具结构设计要公道,厚薄不要太悬殊,外形要对称,对于变形较大模具要把握变形规律,预留加工余量,对于大型、精密复杂模具可采用组合结构。
(2) the structure design of the mould thickness should be fair, not too poor, appearance should be symmetrical, for large deformation of mold to grasp the law of deformation and the machining allowance for the use of composite structure for large, precision, complex mold.
(3)精密复杂模具要进行预先热处理,消除机械加工过程中产生的残余应力。

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(3) the precision complex mold should be pre heat treatment to eliminate the residual stress produced in the machining process.
(4)公道选择加热温度,控制加热速度,对于精密复杂模具可采取缓慢加热、预热和其他均衡加热的方法来减少模具热处理变形。
(4) choose the heating temperature reasonably, control the heating speed, and take the method of slow heating, preheating and other balanced heating to reduce the deformation of the mould.
(5)在保证模具硬度的条件下,尽量采用预冷、分级冷却淬火或温淬火工艺。
(5) under the condition of ensuring the die hardness, the pre cooling, the classified cooling quenching or the temperature quenching process should be adopted as far as possible.
(6)对精密复杂模具,在前提许可的情况下,尽量采用真空加热淬火和淬火后的深冷处理。
(6) sophisticated molds, without permission, as far as possible the use of cryogenic treatment after quenching and vacuum quenching.
(7)对一些精密复杂的模具可采用预先热处理、时效热处理、调质氮化热处理来控制模具的精度。
(7) the precision of mould can be controlled by pre heat treatment, aging heat treatment, quenching and tempering heat treatment.
(8)在修补模具砂眼、气孔、磨损等缺陷时,选用冷焊机等热影响小的修复设备以避免修补过程中变形的产生。
(8) in defect repair mold trachoma, porosity, wear, etc. the selection of cold welding heat affected small repair equipment to avoid deformation of the repair process.

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