Views:0 Author:Site Editor Publish Time: 2021-11-12 Origin:Site
Stainless steel parts have the characteristics of heat resistance, high-temperature resistance, low-temperature resistance, wear resistance, chemical corrosion resistance, and electrochemical corrosion resistance, and are not easy to rust. They are widely used in the chemical industry, food machinery, electromechanical industry, environmental protection industry, household appliances, and other industries. With the wide application of stainless steel parts, the quality of CNC milling steel parts has attracted more and more attention.
Here is the content list:
l Analysis on CNC milling steel parts.
l Problems in the production of CNC milling steel parts.
l Summary of CNC milling steel parts.
High thermal strength and toughness are not suitable for CNC milling steel parts for austenitic stainless steel and martensitic stainless steel, its hardness, and tensile strength are not high, only equivalent to 40 steel, but the elongation, reduction of area and impact The value is relatively high. In this way, it is not easy to be cut off in the process of CNC milling steel parts, and the work consumed when CNC milling steel parts deforms is quite large. Relatively speaking, the strength of stainless steel decreases less at high temperatures. The practice has proved that under the action of the same cutting temperature, stainless steel cutting is more difficult than ordinary carbon steel because of the high thermal strength.
In the process of CNC milling of steel parts, the metal in the cutting zone is deformed due to the extrusion of the tooltip on the workpiece material, slippage occurs in the crystal, the crystal lattice is distorted, the structure is dense, and the mechanical properties also change. The cutting hardness of CNC milled steel parts can also be increased by 2 to 3 times. The depth of the work hardening layer of CNC milling steel parts can range from tens of microns to hundreds of microns. Therefore, the work hardening phenomenon produced by the previous pass harms the next pass, and the high hardness of the work-hardened layer leads to the tool Particularly easy to wear. The strong work hardening tendency is not conducive to the machining of CNC milled steel parts.
In the process of CNC milling steel parts, cutting chips are easy to adhere or fuse on the tip and edge of the tool, forming a built-up edge, causing the surface roughness of the workpiece to have deteriorated, and at the same time increasing the vibration during the cutting process and accelerating the tool Wear. Moreover, a large amount of cutting heat cannot be conducted in time, and even the heat generated by cutting cannot be transmitted to the whole chip. The total heat transferred to the tool is more than that of ordinary carbon steel, and the cutting edge loses cutting performance at high temperatures. Strong chip adhesion and poor thermal conductivity harm CNC milling steel parts
In the machining process of CNC milling steel parts, the large amount of heat energy generated cannot be quickly discharged, and it will inevitably be transferred to the tool, which will increase the temperature of the cutting part. At the same time, due to the difficulty of chip removal, especially the continuous chips, the chip congestion is generated, especially when the inner hole is processed, the chip congestion is more serious. In addition, due to the limited cross-sectional shape of the tool, coupled with its low strength, it is prone to vibration during processing, and the tooltip is easily burned out due to excessive local temperature during the cutting process or cracked due to excessive vibration.
Although CNC milling steel parts have high thermal strength, large plastic deformation, severe work hardening, high cutting heat, and difficult heat dissipation during the cutting process, by selecting appropriate tools, cutting fluids, cutting dosages, and processing methods, It can guarantee the machining quality of CNC milled steel parts.
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