1. Cutting tool selection
Turning stainless steel requires cutting tool materials with high heat resistance, good wear resistance and little affinity with stainless steel. Using ordinary high-speed steel, the durability of the tool is low. If high carbon, molybdenum series and high vanadium high-speed steel are used, the durability of cutting tools can be doubled. The tool material has good toughness, and a large rake angle can be selected to reduce the cutting force and cutting temperature, so as to reduce the depth of the hardened layer. At the same time, the blade can also be sharpened, so that the cutting is light, and the chip and the tool are not easy to bond. The tool has good toughness, which is more suitable for rough turning and intermittent cutting with vibration.
2. Selection of cutting parameters
The cutting speed of turning stainless steel is only 40% - 60% of that of turning ordinary carbon steel. Too high will accelerate the tool wear. Generally, the turning speed of cemented carbide turning tools is (50-100) m/min, and the cutting speed of high-speed steel turning tools is (10-20) m / min. The feed rate should not be too small to prevent the tool from cutting on the hardened layer and aggravating tool wear, which is generally (0.2-0.5) mm / R. The tool should not stay on the cutting surface, so as not to aggravate the hardening of the cutting surface and bring difficulties to the next feed cutting. The cutting depth should not be too small, which is (2-5) mm in rough turning and (0.2-0.5) mm in fine turning.
3. Cutting fluid selection
In general, emulsions can be used for rough turning and cutting fluids with good lubricating properties such as machine oil and spindle oil can be used for fine turning. If the emulsion or vulcanized oil with sulfur-containing, chlorine and other extreme pressure additives is used, the lubrication effect is better.
Emulsion: it has good cooling and cleaning performance, and also has a certain lubricating effect. It can be used for stainless steel rough turning.
vegetable oil; Good lubrication and poor cooling performance, suitable for threading, reaming, tapping and other processes.
Vulcanized oil: it is a cutting oil with sulfur as extreme pressure additive. It is not easy to damage under high temperature, has good lubrication effect, and has a certain cooling effect. It is suitable for fine turning, semi fine turning, drilling, reaming and tapping.