Cutting tool is the most important for cutting stainless steel.
How to select tool geometry parameters when cutting stainless steel?
Front angle G0: the hardness and strength of stainless steel are not high, but its plasticity and toughness are good, and the thermal strength is high, and the chip is not easy to be cut off during cutting. In order to reduce the plastic deformation of the metal to be cut, cutting force and cutting temperature can be reduced, and the depth of hardened layer can be reduced. The front angle of turning various stainless steels is about 12 ° to 30 °. For martensitic stainless steel (such as 2Cr13), the front angle can be larger; for austenitic and austenitic + ferritic stainless steel, the front angle should be smaller; for the stainless steel without quenching and tempering treatment or with low hardness after quenching and tempering, the larger front angle can be adopted; for the small diameter or thin-walled workpiece, the larger front angle should be adopted. For high-speed steel milling cutter, GN = 10 ° – 20 °, for carbide milling cutter, GN = 5 ° – 10 °, for reamer, G0 = 8 ° – 12 ° and for tap, G0 = 15 ° – 20 ° for machine use or G0 = 20 ° for manual use.
Back angle A0: increasing the rake angle can reduce the friction between the flank and the machined surface, but reduce the strength and heat dissipation capacity of the cutting edge. The reasonable value of the back angle depends on the cutting thickness. When the cutting thickness is small, the larger back angle should be selected. Stainless steel turning tool or boring cutter is usually taken as A0 = 10 ° to 20 ° for finish machining or A0 = 6 ° to 10 ° for rough machining); A0 = 10 ° to 20 ° for high-speed steel end milling cutter and A0 = 15 ° to 20 ° for end milling cutter; A0 = 5 ° to 10 ° for hardness alloy end milling cutter and A0 = 12 ° to 16 ° for end milling cutter; A0 = 8 ° to 12 ° for reamer and tap.
Selection of cemented carbide: YG cemented carbide has better toughness, larger front angle can be used, and the blade can be grinded sharper, so that cutting is light and fast, and the chip and cutter are not easy to bond, so it is more suitable for stainless steel processing. Especially in rough turning and intermittent cutting, the advantage of YG alloy is more important. In addition, the thermal conductivity of YG alloy is better than that of high-speed steel by nearly two times and that of YT type alloy. Therefore, YG alloy is widely used in stainless steel cutting, especially in the manufacture of rough turning tool, cutting tool, reamer and reamer.
About the author