Do you know the failure mode of cold working die steel? Cold working die steel focuses on hardness and wear resistance. With high carbon content, alloying elements are added to increase hardenability and wear resistance. But do you know the failure mode of cold working die steel? Next, let's follow the seven and die steel to learn more about it.

脆性断裂失效：主要是模具存在冶金缺陷，如带状组织和网状碳化物；工艺缺陷，如晶粒粗大，表面磨削烧伤，粗糙刀痕，回火不足等；或因工作过程操作不当发生超载，容易发生早期脆断失效。早期脆断的模具寿命很短，一般加工工件不超过数千件，有的寿命甚只有几十次几百次。脆性断口平齐，颜色一致。

Brittle fracture failure: it is mainly due to metallurgical defects in the die, such as banded structure and reticular carbide; process defects, such as coarse grains, surface grinding burn, rough knife marks, insufficient tempering, etc.; or overloading due to improper operation in the working process, which is prone to early brittle fracture failure. The service life of early brittle fracture die is very short. Generally, the working life is not more than thousands of pieces, and some even have only dozens to hundreds of times. The brittle fracture is even and the color is consistent.

Cold working die steel

疲劳断裂失效：主要是由于循环应力所造成的，其断裂过程要比脆断失效缓慢得多，其模具寿命在5000-10000次以上。疲劳断裂端口呈现不同区域，可看到疲劳源、疲劳扩展区和快速断裂区。疲劳断裂常见于各种重载模具，如冷挤压模。由于重载模具在施压变形过程中，模具表面的瞬时温度可达200-300℃，造成温度循环，因而加速了疲劳裂纹的蒙山。

 

Fatigue fracture failure: it is mainly caused by cyclic stress, and its fracture process is much slower than brittle fracture failure, and its die life is more than 5000-10000 times. The fatigue fracture ports show different regions, including fatigue source, fatigue propagation zone and fast fracture zone. Fatigue fracture is common in various heavy-duty dies, such as cold extrusion dies. The instantaneous temperature of die surface can reach 200-300 ℃ in the process of pressure deformation of heavy-duty die, resulting in temperature cycle, thus accelerating the Mengshan fatigue crack.

冷作模具钢在工作时．由于被加工材料的变形抗力比较大，模具的工作部分承受很冷作模具钢大的压力、弯曲力、冲击力及摩擦力。因此，冷作模具的正常报废原因一般是磨损．也有因断裂、崩力和变形超差而提前失效的。

When cold working die steel is working, due to the large deformation resistance of the material to be processed, the working part of the die bears the great pressure, bending force, impact force and friction force of the cold working die steel. Therefore, the normal scrapping reason of cold working dies is wear and tear, and premature failure due to fracture, collapse force and deformation out of tolerance.

冷作模具钢与刃具钢相比．有许多共同点。要求模具有高的硬度和耐磨性、高的抗弯强度和足够的韧性，以保证冲压过程的顺利进行、其不同之处在于模具形状及加工艺复杂．而且摩擦面积大．磨损可能性大．所以修磨起来困难。因此要求具有更高的耐磨化模具工作时承受冲压力大．又由于形状复杂易于产生应力集中，所以要求具有较高的韧性；模具尺寸大、形状复杂．所以要求较高的淬透性、较小的变形及开裂倾向性。总之，冷作模具钢在淬透性、耐磨性与韧性等方面的要求要较刃具钢高一些．而在红硬性方面却要求较低或基本上没要求（因为是冷态成形），所以也相应形成了一些适于做冷作模具用的钢种，例如，发展了高耐磨、微变形冷作模具用钢及高韧性冷作模具用钢等。

Cold working die steel has a lot in common with cutting tool steel. The die is required to have high hardness and wear resistance, high bending strength and enough toughness to ensure the smooth progress of the stamping process. The difference lies in the complex shape of the die and the complex processing technology, large friction area and high possibility of wear, so it is difficult to repair and grind. Therefore, it is required to have higher wear resistance, and the die can bear large impact pressure when working. Because of its complex shape, it is easy to produce stress concentration, so it is required to have high toughness; the die size is large and the shape is complex, so it requires high hardenability, small deformation and cracking tendency. In a word, the requirements of hardenability, wear resistance and toughness of cold working die steel are higher than those of cutting tool steel, while the requirements of red hardness are lower or basically not required (because it is cold forming). Therefore, some steel grades suitable for cold working die have been formed, such as high wear resistance, micro deformation cold work die steel and high toughness cold work die steel.

冷作模具钢

Cold working die steel

你知道冷作模具钢的失效形式吗？上述就是七和模具钢小编给大家介绍的有关冷作模具钢的失效形式，大家看完之后对于冷作模具钢的失效形式是否有了比较详细的了解呢？冷作模具钢在工作时．由于被加工材料的变形抗力比较大，模具的工作部分承受很冷作模具钢大的压力、弯曲力、冲击力及摩擦力。

Do you know the failure mode of cold working die steel? The above is seven and die steel small series to introduce to you about the failure form of cold working die steel, after you have read the failure form of cold working die steel, do you have a more detailed understanding? When cold working die steel is working, due to the large deformation resistance of the material to be processed, the working part of the die bears the great pressure, bending force, impact force and friction force of the cold working die steel.