| 塑料护坡模具断裂原因说明 |
| 添加时间：2019/2/14 8:45:58 浏览次数： |
| 模具的断裂是造成模具报废的主要原因之一，而造成模具断裂的原因也是多种多样的，这就导致断裂也可以分为多种类型。下面根据塑料护坡模具断裂为例说明一下： Die fracture is one of the main causes of die scrap, and the causes of die fracture are also varied, which can also be divided into many types. Following is an example of plastic slope protection die fracture. 如果断裂时没有出现塑性变形，就被称作脆性断裂，脆性断裂又包括一次性断裂和疲劳断裂，按裂纹扩展路径的走向，一次性脆性断裂可分为穿晶断裂和沿晶断裂。 If there is no plastic deformation at the time of fracture, it is called brittle fracture. Brittle fracture includes one-time fracture and fatigue fracture. According to the direction of crack propagation path, one-time brittle fracture can be divided into transgranular fracture and intergranular fracture. 当塑料护坡模具材料韧性差的时候，存在表面缺陷承受高的冲击载荷时，尤其是表面开口缺陷，易发生穿晶断裂，热作模具很少出现这种断裂。 When the toughness of plastic slope protection die material is poor, there are surface defects that bear high impact load, especially surface opening defects, which are prone to transgranular fracture, and hot www.huizhuanyao5.com.cnwww.gzdebon.com.cnwww.dianLiwuzi.com.cnwww.btwujin .cnwww.bjsrxhsart.cnwww.huafuly.cnworking die seldom occurs such fracture. 一般来说，晶界键和力高于晶内，只有晶界被弱化时，才会产生沿晶断裂。晶界沉淀第二相物质和杂质元素的偏聚都会导致晶界弱化，进而使模具发生断裂现象。 Generally speaking, the bonds and forces at grain boundaries are higher than those in grains. Intergranular fracture occurs only when the grain boundaries are weakened. The segregation of the second phase and impurity elements in grain boundary precipitation will weaken the grain boundary, which will lead to the fracture of the die. |
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