山东济南注塑 http://www.zhusujiagong168.com/加工模具在无相变的温度区间加热急冷，在热应力的作用下会产生主导方向上的收缩变形。这种方法常用于热处理胀大变形的校正，或者用于挽救型腔、孔距因磨损或冷加工造成的尺寸超差的模具。根据不同的需要，可采取不同的校正方式。Shandong Ji'nan injection molding die in the no phase change in the temperature range of heating and cooling, under the action of thermal stress will lead to the direction of the contraction deformation. This method is commonly used in the correction of the swelling deformation of heat treatment, or used to save the cavity, the diameter of the hole due to wear or cold processing caused by the size of the super poor mold. According to different needs, different correction methods can be adopted.

1.山东注塑加工模具截面的尺寸小时，内外沮差小，热应力作用弱，收缩效果差。模具截面的尺寸增大时，收缩效果增大.但当尺寸增大到一定限度后，收缩效果又会减小。The size of injection molding mold hours Shandong section, and this difference is small, the effect of thermal stress is weak, the contraction effect is poor. When the size of the mold section increases, the shrinkage effect increases, but when the size increases to a certain limit, the shrinkage effect will be reduced.

2.济南注塑加工模具外表面覆盖淬火收缩内孔法对只要求型孔淬硬而外缘可不淬硬的模具，可用此方法收缩型孔。方法是用铁皮垫附石棉覆盖在外缘表面，然后加热淬火。在淬火冷却时，内孔冷却速度高于外缘而先发生收缩，这使得温度较高、塑性良好的外缘产生内缩变形，从而达到收缩型孔的目的。The outer surface of the plastic injection mould of Ji'nan is covered with the method of quenching and shrinking inner hole, and the mould can be used as the hole of the outer surface of the mold for the purpose of obtaining the hardened hole and the outer surface can not be hardened. The method is that the surface of the outer surface is covered with an iron sheet pad and then heated and quenched. In quenching cooling, the cooling rate of the inner hole is higher than that of the outer edge, and the shrinkage of the inner hole is higher than that of the outer edge.

3.济南注塑加工模具高温奥氏体区急冷收缩法高碳高铬钢等塑性差的材料若采用温度加热急冷，所产生的收缩效果较小。为此，该山东注塑加工可采用高温奥氏体区加热急冷，利用奥氏体较大的热膨胀系数和较好的塑性，使之产生较大的热应力收缩变形。Ji'nan injection molding mould high temperature austenite cooling shrinkage of high carbon high chromium steel and other plastic materials if the temperature difference of heating and cooling, smaller shrinkage effects. To this end, the Shandong injection molding process can be used to heat the high temperature austenite region cooling, the use of larger thermal expansion coefficient of austenite and good plasticity, so that it has a larger thermal stress shrinkage deformation.