Matters needing attention when cutting steel at it

Matters needing attention when cutting steel

the relative machinability of 1Cr18Ni9Ti stainless steel is about 0 5. It is a kind of difficult cutting material, which is mainly manifested in:

high temperature strength and high temperature hardness. Generally, when cutting steel, its strength will be significantly reduced with the increase of cutting temperature, and the chips are easy to be cut off, while 1Cr18Ni9Ti still cannot reduce its mechanical properties at 700 degrees, so the chips are not easy to be cut off, and the cutting force is large during the cutting process, and the tools are easy to wear

high plasticity and toughness. Although the tensile strength and hardness of 1Cr18Ni9Ti are not high, its comprehensive performance is very good. Its plasticity and toughness are high. Its elongation, reduction of area and impact value are high. The elongation of 1Cr18Ni9Ti is 40%, 40 # of 40 # of 45 # of 20Cr and 40Cr steel%, so the chips are not easy to cut, curl and break, and the functions consumed by chip deformation are increased, For example, the energy consumed by cutting a certain volume of 1Cr18Ni9Ti is about 50% higher than that of low-carbon steel with the same volume that can be used for prototype production, and most of the energy is converted into heat energy, raising the cutting temperature

because 1Cr18Ni9Ti is not easy to process and the chips are not easy to cut and break, there is also more friction heat between the tool and the workpiece, while stainless steel 1Cr18Ni9Ti has low thermal conductivity (about 1//3 of ordinary steel), poor heat dissipation and less heat taken away by the chips. Most of the heat is absorbed by the tool, causing the temperature of the tool to rise and aggravating tool wear. Steel has strong affinity for other metal materials. Therefore, when in contact with other metals, adhesion will occur at a certain temperature and pressure. In the cutting process, the tool is easy to produce chip nodules, and it is difficult to obtain a machined surface with high surface roughness

work hardening tendency is strong. The strength of austenitic stainless steel is generally δ B=539mpa, but when cold working at room temperature, due to work hardening and deformation, martensite transformation will be induced, which will increase the strength to δ B=1568

mpa, which greatly increases the friction, wear and cutting force during cutting, which is easy to wear the tool and affect the surface roughness of the workpiece

1cr18ni9ti material has many fine carbide (such as TIC) particles, Meeting M (it means that this kind of mechanical and electrical equipment adopts imitation signals to control the length of the cable of the product, which intensifies the wear of the cutting tool. The melting point of the material is low, and it is easy to stick to the tool, and it is easy to form chip nodules during the cutting process. Due to the high toughness of stainless steel, there is a lot of pressure and high temperature between the leading surface of the tool and the chip during the cutting process, and the chip is easy to adhere to the blade, forming chip nodules, which affects the surface processing quality.

so the cutting of 1Cr18Ni9Ti The performance is very poor, especially in intermittent cutting, the tool is very prone to wear and bond damage, and the service life of the tool is very low, which affects the processing efficiency, processing cost, processing accuracy and surface quality