What are the materials for CNC processing

China PTJ Hardware Shop
4 min readDec 9, 2020


General China CNC machining usually refers to the computer digital control precision machining, CNC machining lathe, CNC milling machine, CNC machining boring milling machine, etc.

CNC is also called computer gong, cncch or CNC machine tool. In fact, it was introduced into the Pearl River Delta of mainland China. It is actually a CNC milling machine. In Guangzhou, Jiangsu, Zhejiang and Shanghai, a new type of machining technology is called CNC machining center. Its main work is to compile processing programs, that is, to convert the original manual work into computer programming. Of course, manual processing experience is required.

Advantages of CNC machining

  • 1. A large number of tooling is reduced, and complex tooling is not needed to process parts with complex shapes. If you want to change the shape and size of parts, you only need to modify the part processing program, which is suitable for the development and modification of new products.
  • 2. The machining quality is stable, the machining precision is high, and the repetition precision is high, which can meet the processing requirements of aircraft.
  • 3. In the case of multi variety and small batch production, the production efficiency is higher, the time of production preparation, machine tool adjustment and process inspection can be reduced, and the cutting time is reduced due to the use of the best cutting amount.
  • 4. It can machine complex surface which is difficult to process by conventional method, and even can process some parts which cannot be observed.
  • 5. The disadvantage of NC machining is the high cost of machine tools, which requires maintenance personnel to have a high level.

In the future, in addition to providing 3D printing services for users, the workshop can also provide mold opening and injection molding, silica gel re molding, CNC processing and other services. The main materials processed by CNC are as follows:

Aluminum alloy 6061

6061 aluminum alloy is a high-quality aluminum alloy product produced by heat treatment and pre stretching process. Although its strength can not be compared with 2XXX series or 7xxx series, its magnesium and silicon alloy properties are more.

Material advantages:

It has excellent processing performance, excellent welding characteristics and electroplating, good corrosion resistance, high toughness and no deformation after processing, compact material without defects and easy polishing, easy coloring film and excellent oxidation effect.

7075 aluminum alloy

7075 aluminum alloy is a kind of cold treatment forging alloy with high strength, far better than soft steel. 7075 is one of the most powerful alloys commercially available.

Material advantages:

General corrosion resistance, good mechanical properties and anodic reaction. Fine grains make deep drilling performance better, tool wear resistance enhanced, thread rolling more distinctive.

Red copper

Pure copper (also known as red copper) is a tough metal with excellent conductivity. Its surface is rose red. It is not pure copper machining, it contains 99.9% copper, and some other elements are added to improve the surface and properties.

Material advantages:

It has good conductivity, heat conduction, ductility, deep drawing and corrosion resistance.

The conductivity and thermal conductivity of red copper are second only to silver, and are widely used to make electrical and thermal conductivity equipment. Copper has good corrosion resistance in the atmosphere, sea water, some non oxidizing acids (hydrochloric acid, dilute sulfuric acid), alkali, salt solution and a variety of organic acids (acetic acid, citric acid), which is used in chemical industry.

It has good weldability and can be processed into various semi-finished products and finished products by cold and hot plastic processing. In the 1970s, the output of red copper exceeded the total output of other types of copper alloys.


Brass is a copper zinc alloy. The brass composed of copper machining and zinc is called ordinary brass.

Material advantages:

It has high strength, high hardness and strong chemical corrosion resistance. The mechanical properties of cutting are also outstanding.

Brass has strong wear resistance. Special brass is also called special brass. It has high strength, high hardness and strong chemical corrosion resistance. The mechanical properties of cutting are also outstanding. The seamless copper tube drawn by brass is soft and wear-resistant.

45 steel

45 steel is called “oil steel” in GB. It has high strength and good machinability.

Material advantages:

It has high strength and good machinability. After proper heat treatment, it can obtain certain toughness, plasticity and wear resistance. The material source is convenient and suitable for hydrogen welding and argon arc welding.

Introduction of 40Cr steel

40Cr is the standard steel grade of GB in China, and 40Cr steel is one of the most widely used steels in mechanical manufacturing industry.

Material advantages:

It has good comprehensive mechanical properties, good low temperature impact toughness and low notch sensitivity. Besides quenching and tempering, the steel is also suitable for cyaniding and high frequency quenching. The laser cutting performance is good.

Introduction of Q235 steel

Q235 steel is a kind of carbon structural steel, in which Q represents yield strength. In general, the steel is directly used without heat treatment.

Material advantages:

The yield value will decrease with the increase of the thickness of the material. Due to the moderate carbon content, good comprehensive properties, good combination of strength, plasticity and welding properties, it is widely used.

SUS304 steel

SUS304 refers to 304 stainless steel, with good processability and high toughness.

Material advantages:

It has good corrosion resistance, heat resistance, corrosion resistance, low temperature strength and mechanical properties. It has good hot working properties such as stamping and bending, no heat treatment hardening phenomenon and no magnetism.



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