What cutter is used for processing stainless steel? As we all know, stainless steel is a difficult to machine material. It has a large tendency of work hardening, high temperature strength, and increased shear stress in the shear slip zone, which increases the total cutting resistance, thus increasing tool wear. Therefore, it is very important to select the appropriate stainless steel processing tool. Here, the quick screening small knitting will simply introduce the selection method and precautions for you.
Reasonable selection of tool material is an important condition for high efficiency machining of stainless steel. According to the cutting characteristics of stainless steel, it is required that the tool material should have good heat resistance, high wear resistance and low affinity with stainless steel. At present, the commonly used tool materials are high-speed steel and hard alloy.
1、 Selection of High Speed Steel
High speed steel is mainly used to manufacture complex multi cutting tools such as end mills, drills, taps, broaches, etc. The tool durability of ordinary high speed steel W18Cr4V is very low when it is used, which does not meet the requirements. A new type of high speed steel tool can achieve better results in cutting stainless steel.
With the continuous development of NC tool manufacturing technology, for large quantities of workpieces, it will be better to use carbide multi edge and complex tools for cutting.
2、 Selection of cemented carbide
YG cemented carbide has good toughness. It can use a larger rake angle, and the blade can also be sharpened to make the cutting light and fast. The chip is not easy to bond with the tool, so it is more suitable for processing stainless steel. This advantage of YG alloy is more important especially in rough turning and intermittent cutting of vibration. In addition, YG alloy has good thermal conductivity, with its thermal conductivity nearly twice as high as that of high-speed steel and twice as high as that of YT alloy. Therefore, YG alloys are widely used in stainless steel cutting, especially in the manufacture of rough turning tools, cutting tools, reamers and reamers.
In addition to the selection of materials, attention should also be paid to the selection of tool angles. When machining stainless steel, the geometric shape of the cutting part of the tool should generally be considered from the front angle and back angle. When selecting the rake angle, factors such as the chip groove type, whether there is chamfer, and the positive and negative angle of the edge inclination should be considered. No matter what kind of cutter, large front angle must be used when processing stainless steel. Increasing the rake angle of the tool can reduce the resistance encountered during chip separation and removal. The selection of back angle is not very strict, but it should not be too small. If the back angle is too small, it will easily cause serious friction with the workpiece surface, which will deteriorate the roughness of the machined surface and accelerate tool wear. And because of the strong friction, the work hardening effect of the stainless steel surface is enhanced; The back angle of the tool should not be too large, which will reduce the wedge angle of the tool, reduce the strength of the cutting edge and accelerate the wear of the tool. Generally, the back angle should be larger than that when machining ordinary carbon steel.
