It's an exciting CES show
Difficulties in CNC Machining of Stainless Steel Precision Parts
by：Foxron
2021-10-01
u200bBecause stainless steel precision parts have excellent corrosion resistance, formability, compatibility, and toughness in a wide temperature range, they are widely used in heavy industry, light industry, daily necessities industry, and architectural decoration industries. Applications.
People call alloy steel with more than 12% chromium or more than 8% nickel as stainless steel. This steel has certain corrosion resistance in the atmosphere or in corrosive media, and has high strength at higher temperatures (>450°C). Steel with a chromium content of 16% to 18% is called acid-resistant steel or acid-resistant stainless steel, and is commonly referred to as stainless steel.
Due to the above-mentioned characteristics of stainless steel, it is more and more widely used in aviation, aerospace, chemical, petroleum, construction and food industries and daily life.
Stainless steel has the following characteristics in the CNC cutting process:
Serious work hardening: the plasticity of stainless steel is large, the character is distorted during plastic deformation, and the strengthening coefficient is large; and the austenite is not stable enough, under the action of cutting stress, part of the austenite will be transformed into martensite; In addition, under the action of cutting heat, the compound impurities are easy to decompose into a dispersed distribution, so that a hardened layer is produced during cutting. The work hardening phenomenon produced by the previous feed or the previous process seriously affects the smooth progress of the subsequent process.
Large cutting force: The plastic deformation of stainless steel is large during the cutting process, which leads to an increase in cutting force. Stainless steel has serious work hardening and high thermal strength, which further increases the cutting resistance, and it is also difficult to curl and break the chips.
High cutting temperature: The plastic deformation and friction with the tool are large during cutting, and a lot of cutting heat is generated; a large amount of cutting heat is concentrated on the interface between the cutting area and the tool-chip contact, and the heat dissipation condition is poor.
The chips are not easy to break and easy to bond: stainless steel has great plasticity and toughness. The chips are continuous during CNC machining, which not only affects the smooth operation of the operation, but also crushes the machined surface. Under high temperature and high pressure, stainless steel has a strong affinity with other metals, and it is easy to cause adhesion and form built-up tumors, which not only aggravates tool wear, but also tears and deteriorates the processed surface.
The tool is easy to wear: the affinity effect in the process of cutting stainless steel causes the bonding and diffusion between the tool and the chip, thereby causing the tool to produce bonding wear and diffusion wear, resulting in crescent craters on the rake face of the tool, and the cutting edge Tiny spalling and nicks will be formed; in addition, the carbide (such as TiC) particles in stainless steel have high hardness, direct contact with the tool during cutting, friction, abrasion of the tool, and work hardening phenomenon, all of which will increase the wear of the tool.
Large linear expansion coefficient: The linear expansion coefficient of stainless steel is about 1.5 times that of carbon steel. Under the action of cutting temperature, the workpiece is prone to thermal deformation, and the dimensional accuracy is difficult to control.
Stainless steel parts are increasingly used in electric power, aviation, aerospace, petroleum and food industries due to their special properties. Although stainless steel cutting has the characteristics of high thermal strength, large plastic deformation, severe work hardening, excessive cutting heat, and difficulty in heat dissipation, the quality of stainless steel processing can be guaranteed by selecting appropriate tools, cutting fluids, cutting amounts, and processing methods. .
People call alloy steel with more than 12% chromium or more than 8% nickel as stainless steel. This steel has certain corrosion resistance in the atmosphere or in corrosive media, and has high strength at higher temperatures (>450°C). Steel with a chromium content of 16% to 18% is called acid-resistant steel or acid-resistant stainless steel, and is commonly referred to as stainless steel.
Due to the above-mentioned characteristics of stainless steel, it is more and more widely used in aviation, aerospace, chemical, petroleum, construction and food industries and daily life.
Stainless steel has the following characteristics in the CNC cutting process:
Serious work hardening: the plasticity of stainless steel is large, the character is distorted during plastic deformation, and the strengthening coefficient is large; and the austenite is not stable enough, under the action of cutting stress, part of the austenite will be transformed into martensite; In addition, under the action of cutting heat, the compound impurities are easy to decompose into a dispersed distribution, so that a hardened layer is produced during cutting. The work hardening phenomenon produced by the previous feed or the previous process seriously affects the smooth progress of the subsequent process.
Large cutting force: The plastic deformation of stainless steel is large during the cutting process, which leads to an increase in cutting force. Stainless steel has serious work hardening and high thermal strength, which further increases the cutting resistance, and it is also difficult to curl and break the chips.
High cutting temperature: The plastic deformation and friction with the tool are large during cutting, and a lot of cutting heat is generated; a large amount of cutting heat is concentrated on the interface between the cutting area and the tool-chip contact, and the heat dissipation condition is poor.
The chips are not easy to break and easy to bond: stainless steel has great plasticity and toughness. The chips are continuous during CNC machining, which not only affects the smooth operation of the operation, but also crushes the machined surface. Under high temperature and high pressure, stainless steel has a strong affinity with other metals, and it is easy to cause adhesion and form built-up tumors, which not only aggravates tool wear, but also tears and deteriorates the processed surface.
The tool is easy to wear: the affinity effect in the process of cutting stainless steel causes the bonding and diffusion between the tool and the chip, thereby causing the tool to produce bonding wear and diffusion wear, resulting in crescent craters on the rake face of the tool, and the cutting edge Tiny spalling and nicks will be formed; in addition, the carbide (such as TiC) particles in stainless steel have high hardness, direct contact with the tool during cutting, friction, abrasion of the tool, and work hardening phenomenon, all of which will increase the wear of the tool.
Large linear expansion coefficient: The linear expansion coefficient of stainless steel is about 1.5 times that of carbon steel. Under the action of cutting temperature, the workpiece is prone to thermal deformation, and the dimensional accuracy is difficult to control.
Stainless steel parts are increasingly used in electric power, aviation, aerospace, petroleum and food industries due to their special properties. Although stainless steel cutting has the characteristics of high thermal strength, large plastic deformation, severe work hardening, excessive cutting heat, and difficulty in heat dissipation, the quality of stainless steel processing can be guaranteed by selecting appropriate tools, cutting fluids, cutting amounts, and processing methods. .
Custom message
Related Products
Tel : 86 769 3325 6035 / 86 769 8306 2140
Fax : +86 769 85634781
E-mail : 
Wechat//whatsapp : +86 189 3818 5885
Address : Wentang Industrial Zone, East District, Dongguan, Guangdong 
Zip code : 523121
