机械加工性与机械加工性相同，是指金属材料被刀具切削成为合格工件的难易程度。那么影响热作模具钢切削加工性的因素有哪些呢？

Machinability is the same as machinability, which refers to the difficulty of cutting metal materials into qualified workpieces by cutting tools. So what are the factors that affect the machinability of hot work die steel?

1、化学成分：钢的合金成分越高，越难加工。当碳含量增加时，金属切削性能下降。

1. Chemical composition: the higher the alloy composition of steel, the more difficult it is to process. When the carbon content increases, the metal cutting performance decreases.

2、钢的组织结构：不同的组织结构影响金属切削性能，如锻造、铸造、挤压、轧制和机加工，锻件和铸件具有非常难加工的表面。

2. Structure of steel: different structures affect metal cutting performance, such as forging, casting, extrusion, rolling and machining. Forgings and castings have very difficult to machine surfaces.

3、硬度：硬度是影响金属切削性能的重要因素。一般规则是钢越硬，加工就越困难。高速钢（HSS）可用于加工硬度高达330-400HB的材料；高速钢氮化钛(TiN)涂层可用于加工硬度高达45HRC的材料；对于硬度为65-70HRC的材料，必须使用Carbide.Ceramic.Cermet和CubicBoronNitride(CBN)。

3. Hardness: hardness is an important factor affecting metal cutting performance. The general rule is that the harder the steel, the more difficult it is to process. High speed steel (HSS) can be used to process materials with hardness up to 330-400hb; High speed steel titanium nitride (TIN) coating can be used to process materials with hardness up to 45hrc; For materials with hardness of 65-70hrc, carbide must be used Ceramic. Cermet and cubicboronnitride (CBN).

4、非金属夹杂物：一般对刀具寿命有不利影响。例如，Al2O3（氧化铝）是一种纯陶瓷，具有很强的磨蚀性。

4. Non metallic inclusions: generally have adverse effects on tool life. For example, Al2O3 (aluminum oxide) is a pure ceramic with strong abrasiveness.

5、残余应力：残余应力会引起金属切削性能问题，一般建议在粗加工后进行去应力处理。粗加工的表面粗糙度请参考《线切割表面粗糙怎么处理》

5. Residual stress: residual stress will cause metal cutting performance problems. It is generally recommended to carry out stress relief treatment after rough machining. For the surface roughness of rough machining, please refer to how to treat the surface roughness of wire cutting

山东热作模具钢在此来延伸一个话题：

Shandong hot work die steel extends a topic here:

一般来说，铸铁的硬度和强度越高，金属切削性能越低，刀片和工具的预期寿命就越低。用于金属切削生产的铸铁一般对大多数类型具有良好的金属切削性能。金属切削性能与组织有关，越硬的珠光体铸铁越难加工。片状石墨铸铁和可锻铸铁具有优良的切削性能，而球墨铸铁则相当差。

Generally speaking, the higher the hardness and strength of cast iron, the lower the metal cutting performance, and the lower the life expectancy of blades and tools. Cast iron used in metal cutting production generally has good metal cutting properties for most types. The metal cutting performance is related to the structure. The harder the pearlitic cast iron is, the more difficult it is to machine. Flake graphite cast iron and malleable cast iron have excellent cutting properties, while nodular cast iron is quite poor.

加工铸铁通常需要的典型刀具特性有：

Typical tool characteristics typically required for machining cast iron are:

高热硬度和化学稳定性，还与工艺、工件和切削条件有关；切削刃要求有韧性、热疲劳磨损和刃口强度。切削铸铁的满意度取决于切削刃磨损的发展方式：快速钝化意味着热裂纹和刻痕会导致切削刃过早断裂。工件破损。表面质量差。过度的波纹等。正常的后刀面磨损。保持平衡和锋利的切削刃正是通常需要努力才能实现的目标。

High thermal hardness and chemical stability are also related to process, workpiece and cutting conditions; The cutting edge shall have toughness, thermal fatigue wear and edge strength. The satisfaction of cutting cast iron depends on the development of cutting edge wear: rapid passivation means that hot cracks and nicks will lead to premature fracture of cutting edge. The workpiece is damaged. Poor surface quality. Excessive ripple, etc. Normal flank wear. Maintaining a balanced and sharp cutting edge is a goal that usually requires effort to achieve.

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