1. After the hand plate is deformed, there is a certain residual stress in it. The stress should be relieved before processing the hand plate. Stress annealing and natural aging can be used to eliminate internal stress.

2、手板热裂纹多数是由于机械应力造成，是在金属凝固所造成的裂纹。解决办法是改良手板结构，使其与金属接触的面更少。另外一种办法是在控制金属的含硫量而增加金属的热脆性。

2. The hot cracks of the hand plate are mostly caused by mechanical stress and are caused by metal solidification. The solution is to improve the hand board structure so that it has less contact with metal. Another way is to control the sulfur content of the metal and increase the thermal brittleness of the metal.

3、手板冷裂纹是在低温下所产品的裂纹。这是由于手板变形引致的，常常出现在手板受拉伸的地方，冷裂纹一般比较细小，但这种裂纹是不可逆的缺陷，只能重做。在制作大型而薄的手板时，常发生冷裂纹。相似，预防办法也是减小内部应力和控制金属中磷的含量。

3. The cold crack of the hand plate is the crack of the product at low temperature. This is caused by the deformation of the hand board, which often occurs in the place where the hand board is under tension. The cold crack is generally small, but this kind of crack is irreversible and can only be redone. When making large and thin hand boards, cold cracks often occur. Similarly, the preventive measures are to reduce the internal stress and control the content of phosphorus in the metal.

此外手板模型材料的选用，既要满足客户对产品质量的要求，还需考虑到材料的成本及其在设定周期内的强度，当然还要根据手板模型的类型、使用工作方式、加工速度、主要失效形式等因素来选材。

In addition, the selection of the material of the hand model should not only meet the customer's requirements for product quality, but also take into account the cost of the material and its strength within the set period. Of course, the material should be selected according to the type of the hand model, the working mode, the processing speed, the main failure forms and other factors.

例如：冲裁模的主要失效形式是刃口磨损，就要选择表面硬度高、耐磨性好的材料；冲压模主要承受周期性载荷，易引起表面疲劳裂纹，导致表层剥落，那就要选择表面韧性好的材料；拉深模应选择磨擦系数特别低的材料。

For example, the main failure form of blanking die is edge wear, so it is necessary to select materials with high surface hardness and good wear resistance; Stamping die mainly bears periodic load, which is easy to cause surface fatigue crack and lead to surface peeling, so it is necessary to select materials with good surface toughness; The drawing die shall be made of materials with low friction coefficient.

可以看出一旦手板模型发生变形和裂纹，补救措施非常麻烦，甚有些变形和裂纹是无法补救的，是手板模型的重大缺陷，所以变形和裂纹是以预防措施为主，尽量避免出现变形和裂纹。更多相关内容就来我们网站http://www.metferro.com咨询了解吧！

It can be seen that once deformation and cracks occur in the hand model, remedial measures are very troublesome, and even some deformation and cracks cannot be remedied, which are major defects of the hand model. Therefore, deformation and cracks are mainly preventive measures to avoid deformation and cracks as much as possible. Come to our website for more relevant content http://www.metferro.com Ask about it!