304
Stainless Steel Pipe has alloy elements such as Cr, Ni, N, Nb, Mo, etc., which makes the
Steel Pipe have good toughness and wear resistance, and is widely used in electrical appliances and mechanical equipment. However, its machinability is poor. In actual processing, cutting stainless steel welded pipes is often accompanied by the occurrence of knife breakage and knife sticking. Due to the large plastic deformation of stainless steel during cutting, the generated chips are not easy to break and stick, resulting in serious work hardening during the cutting process; how to solve the problem of difficult cutting of 304 stainless steel pipes?
Choosing the right tool is the basis for machining high-quality parts. If the tool is too poor, the machining scrap rate is high. Although the selected tool can meet the surface quality requirements of the parts, it is easy to cause waste and increase the production cost. Combined with the characteristics of poor heat dissipation, work hardening layer, and easy sticking of knives during cutting of stainless steel pipes, the selected tool materials should meet the characteristics of good heat resistance, high wear resistance, and small affinity with steel pipes.
High-speed steel is a high-alloy tool steel with alloying elements such as W, Mo, Cr, V, Go, etc. It has good process performance, good strength and toughness, and strong resistance to shock and vibration. In the case of high heat generated by high-speed cutting (about 500 ° C), it can still maintain high hardness (HRC is still above 60), high-speed steel has good red hardness, suitable for making milling tools such as milling cutters, turning tools, etc. The resulting hardened layer and poor heat dissipation and other cutting environments.
Cemented carbide is a powder metallurgy sintered in a vacuum furnace or a hydrogen reduction furnace with micron-scale powder of high-hardness refractory metal carbide (WC, TiC) as the main component and cobalt or nickel and molybdenum as a binder. product. Cemented carbide has a series of excellent properties such as good strength and toughness, heat resistance, wear resistance, corrosion resistance, and high hardness. It remains basically unchanged at a temperature of 500 °C, and still has a high hardness at 1000 °C, which is suitable for cutting 304 stainless steel pipes, heat-resistant steel and other difficult-to-machine materials.
How to solve the problem of difficult cutting of 304 stainless steel pipe? The generation of the work-hardened layer and the increase of the cutting force will inevitably lead to the increase of the friction between the tool and the workpiece, and the cutting temperature will also increase. In addition, the thermal conductivity of stainless steel is small, the heat dissipation conditions are poor, and a large amount of cutting heat is concentrated between the tool and the workpiece, which deteriorates the machined surface and seriously affects the quality of the machined surface. Tools with high temperature resistance, good heat dissipation, wear resistance and high hardness should be used.
