機械加工性與機械加工性相同，是指金屬材料被刀具切削成為合格工件的難易程度。那么影響熱作模具鋼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、化學成分：鋼的合金成分越高，越難加工。當碳含量增加時，金屬切削性能下降。

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、鋼的組織結構：不同的組織結構影響金屬切削性能，如鍛造、鑄造、擠壓、軋制和機加工，鍛件和鑄件具有非常難加工的表面。

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：硬度是影響金屬切削性能的重要因素。一般規則是鋼越硬，加工就越困難。高速鋼（HSS）可用于加工硬度高達330-400HB的材料；高速鋼氮化鈦(TiN)涂層可用于加工硬度高達45HRC的材料；對于硬度為65-70HRC的材料，必須使用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、非金屬夾雜物：一般對刀具壽命有不利影響。例如，Al2O3（氧化鋁）是一種純陶瓷，具有很強的磨蝕性。

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

5、殘余應力：殘余應力會引起金屬切削性能問題，一般建議在粗加工后進行去應力處理。粗加工的表面粗糙度請參考《線切割表面粗糙怎么處理》

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

山東熱作模具鋼在此來延伸一個話題：

Shandong hot work die steel extends a topic here:

一般來說，鑄鐵的硬度和強度越高，金屬切削性能越低，刀片和工具的預期壽命就越低。用于金屬切削生產的鑄鐵一般對大多數類型具有良好的金屬切削性能。金屬切削性能與組織有關，越硬的珠光體鑄鐵越難加工。片狀石墨鑄鐵和可鍛鑄鐵具有優良的切削性能，而球墨鑄鐵則相當差。

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.

加工鑄鐵通常需要的典型刀具特性有：

Typical tool characteristics typically required for machining cast iron are:

高熱硬度和化學穩定性，還與工藝、工件和切削條件有關；切削刃要求有韌性、熱疲勞磨損和刃口強度。切削鑄鐵的滿意度取決于切削刃磨損的發展方式：快速鈍化意味著熱裂紋和刻痕會導致切削刃過早斷裂。工件破損。表面質量差。過度的波紋等。正常的后刀面磨損。保持平衡和鋒利的切削刃正是通常需要努力才能實現的目標。

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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