The key of cold working die includes cold stamping die, cold shear cutting die, cold punching loading die, hot forging die, cold drawing die, cold upsetting die, wire drawing die, wire rolling die, pressing die, etc., and the requirements for die steel are high.

一、冷作模具特性规定

1、 Specification for characteristics of cold working die

1.模具的耐磨性能

1. Wear resistance of die

模具在45钢锭定制运行时，表层余胚料中间造成无数次磨擦，模具务必在这样的情况下仍能维持较低的外表粗糙度值和较高的规格**度，防止初期无效。

The surface roughness of the ingot must be maintained at 45 times, so as to prevent the surface roughness from being invalid when the ingot runs at the initial stage.

因为模具材料的强度和机构是危害模具耐磨性的主要要素，因而为了更好地提升冷作模具的抗磨性能，通常规定模具强度高过零件加工强度30%~50%，原材料的机构为淬火奥氏体货下马氏体，其上遍布匀称、细微的颗粒状渗碳体。要做到此目地，45钢锭现货钢材牌号太的质量浓度一般都是在0.60%以上。

Because the strength and mechanism of the die material are the main factors endangering the wear resistance of the die, in order to better improve the wear resistance of the cold working die, it is usually stipulated that the die strength is 30% ~ 50% higher than the processing strength of the parts. The mechanism of the raw material is quenched austenite under the goods martensite, which is covered with symmetrical and fine granular cementite. To achieve this goal, the quality concentration of spot steel grades of 45 ingots is generally more than 0.60%.

2.模具的延展性

2. Die ductility

4cr13模具钢模具材料的延展性，要依据模具工作中标准来巨鼎，针对受明显冲击负载的模具，如冷作模具的模座、冷镦模具等，因手冲击负载比较大，余姚高的延展性；针对一般工作中标准下的冷作模具，通常接到的是小动能多次冲击负载的功效，模具的无效方式是大批量破裂，因而模具无须具备过高的冲击韧性值。

The ductility of 4Cr13 die steel and die materials should be determined according to the standards in die work. For dies subject to obvious impact load, such as die base of cold working die and cold heading die, Yuyao has high ductility due to large hand impact load; For the cold working die under the general working standard, it usually receives the effect of multiple impact loads with small kinetic energy. The ineffective way of the die is mass fracture, so the die does not need to have too high impact toughness value.

3.模具的强度

3. Strength of mould

模具的轻微即指模具了零件在作业环节中抵御形变和破裂的工作能力。强度指标值是冷作模具设计方案和原材料挑选的重要凭证，主要包含：拉申屈服点、缩小屈服点等。屈服点的考量模具零件塑性形变抵抗力的指标值，也是较常用的强度指标值。为了更好地过得搞得强度，在模具生产制造环节中，要选用适宜的模具材料，并根据适度的热处理方法来做到其规定。

The slight of the die refers to the working ability of the part to resist deformation and fracture in the operation link. The strength index value is an important certificate for the design scheme of cold working die and the selection of raw materials, mainly including: Rashin yield point, reduced yield point, etc. Yield point is the index value of plastic deformation resistance of die parts, which is also a commonly used strength index value. In order to get better strength, appropriate mold materials should be selected in the process of mold production and manufacturing, and their provisions should be met according to appropriate heat treatment methods.

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