Only through proper heat treatment process can the cold working die meet the performance requirements. The basic heat treatment processes commonly used in cold working dies include normalizing, annealing, quenching and tempering, quenching, tempering, carburizing, nitriding, etc.

(1)正火；改*模具毛坯料的各种组织缺陷，获得利于切削加工的组织与硬度，改*组织，细化晶粒，为后续热处理作好组织准备。

(1) Normalizing; Change the various structural defects of the die blank, obtain the structure and hardness conducive to cutting, change the structure, refine the grain, and prepare for the subsequent heat treatment.

(2)退火；冷作模具钢常用的退火工艺主要有以下三种：完全退火、球化退火、去应力退火。

(2) Annealing; There are three common annealing processes for cold working die steel: complete annealing, spheroidizing annealing and stress relief annealing.

(3)调质；’对于形状复杂、尺寸精度要求高的模具，以及模具表面需要进行强化处理（氮化）的模具，调质应安排在粗加工之后精加工之前，以减小模具淬火变形和降低精加工的表面粗糙度值。

(3) Conditioning; ' For the mold with complex shape and high dimensional accuracy requirements, as well as the mold whose surface needs strengthening treatment (nitriding), the quenching and tempering shall be arranged after rough machining and before finish machining, so as to reduce the quenching deformation of the mold and reduce the surface roughness value of finish machining.

(4)淬火；使模具获得所需的使用性能。淬火是模具制造过程中很重要的一个工序。

(4) Quenching; Make the mold obtain the required performance. Quenching is a very important process in die manufacturing.

(5)回火；冷作模具淬火后都应尽快进行回火，以免在淬火应力的作用下造成开裂的危险。

(5) Tempering; The cold working die should be tempered as soon as possible after quenching to avoid the risk of cracking under the action of quenching stress.

(6)渗碳；在模具制造中渗碳常用于导柱、导套等零件。

(6) Carburizing; Carburizing is often used for parts such as guide post and guide sleeve in die manufacturing.

(7)氮化；常用于工作载荷不大，但要求高耐磨、抗耐蚀的冷成形凹模、奥氏体不锈钢用拉伸模具等。

(7) Nitriding; It is commonly used in cold forming concave dies with small working load but requiring high wear resistance and corrosion resistance, drawing dies for austenitic stainless steel, etc.

(8)冷处理；适宜于复杂的冷作模具或高合金钢制造的模具。冷处理后马氏体转变量增多，钢的硬度增加，但模具的尺寸也略大。

(8) Cold treatment; It is suitable for complex cold working molds or molds made of high alloy steel. After cold treatment, the martensite transformation increases and the hardness of steel increases, but the size of die is also slightly larger.

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