成人精品久久久_极品一线天粉嫩虎白馒头 _日韩a毛片免费全部播放完整_亚洲一区二区三区四区五区

山東濟南注塑 http://m.tco925.cn/加工模具在無相變的溫度區間加熱急冷，在熱應力的作用下會產生主導方向上的收縮變形。這種方法常用于熱處理脹大變形的校正，或者用于挽救型腔、孔距因磨損或冷加工造成的尺寸超差的模具。根據不同的需要，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.山東注塑加工模具截面的尺寸小時，內外沮差小，熱應力作用弱，收縮效果差。模具截面的尺寸增大時，收縮效果增大.但當尺寸增大到一定限度后，收縮效果又會減小。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.濟南注塑加工模具外表面覆蓋淬火收縮內孔法對只要求型孔淬硬而外緣可不淬硬的模具，可用此方法收縮型孔。方法是用鐵皮墊附石棉覆蓋在外緣表面，然后加熱淬火。在淬火冷卻時，內孔冷卻速度高于外緣而先發生收縮，這使得溫度較高、塑性良好的外緣產生內縮變形，從而達到收縮型孔的目的。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.濟南注塑加工模具高溫奧氏體區急冷收縮法高碳高鉻鋼等塑性差的材料若采用溫度加熱急冷，所產生的收縮效果較小。為此，該山東注塑加工可采用高溫奧氏體區加熱急冷，利用奧氏體較大的熱膨脹系數和較好的塑性，使之產生較大的熱應力收縮變形。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.