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、冷作模具特性規定

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鋼錠定制運行時，表層余胚料中間造成無數次磨擦，模具務必在這樣的情況下仍能維持較低的外表粗糙度值和較高的規格，防止初期無效。

During the customized operation of 45 steel ingot, there are countless times of friction between the surface residual embryo materials. The mold must be able to maintain a low surface roughness value and high specification under such circumstances to prevent initial invalidation.

因為模具材料的強度和機構是危害模具耐磨性的主要要素，因而為了更好地提升冷作模具的抗磨性能，通常規定模具強度高過零件加工強度30%~50%，原材料的機構為淬火奧氏體貨下馬氏體，其上遍布勻稱、細微的顆粒狀滲碳體。要做到此目地，45鋼錠現貨鋼材牌號太的質量濃度一般都是在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模具鋼模具材料的延展性，要依據模具工作中標準來巨鼎，針對受明顯沖擊負載的模具，如冷作模具的模座、冷鐓模具等，因手沖擊負載比較大，余姚高的延展性；針對一般工作中標準下的冷作模具，通常接到的是小動能多次沖擊負載的功效，模具的無效方式是大批量破裂，因而模具無須具備過高的沖擊韌性值。

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.模具的強度

3. Strength of mould

模具的輕微即指模具了零件在作業環節中抵御形變和破裂的工作能力。強度指標值是冷作模具設計方案和原材料挑選的重要憑證，主要包含：拉申屈服點、縮小屈服點等。屈服點的考量模具零件塑性形變抵抗力的指標值，也是較常用的強度指標值。為了更好地過得搞得強度，在模具生產制造環節中，要選用適宜的模具材料，并根據適度的熱處理方法來做到其規定。

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.