In order to process heat-resistant superalloys with relatively high production efficiency, the corresponding processing strategies must be carefully prepared. Since at least 50% of the process of processing the parts of this material is turning, the basic principle should be based on the use of appropriate cutting edge cutting method.
The turning process is dominant in the heat resistant super alloy (HRSAs) machining field, and the correct application of the blade is one of the keys to ensure success. The unique properties of heat resistant superalloys (HRSA), such as excellent high temperature strength, excellent toughness and corrosion resistance, make them the only choice for steam turbines, jet engines, chemical and food equipment, medical devices, and some of the above components. But these attributes also mean that machining is difficult -- especially when high efficiency is required.
Poor machinability of heat resistant superalloys requires good planning, selection, and application of all elements of the entire processing chain, from machine tools to CAD, from tool handles to cutting edges.
The cutting tool has a great effect
In cnc turning, the cutting edge's cutting into the workpiece is mainly determined by the main Angle of the cutting edge. In particular, the competitiveness of production efficiency will be directly affected when turning heat-resistant superalloys, as this will directly affect the feed rate of the tool, which largely determines the required cutting time. When the main deflection Angle is large, the feed rate is mainly limited by the allowable load of the blade, which is partly determined by the chip thickness. When the main deflection Angle is small, the chip thickness must be large enough for the cutting edge to pass through the normal cutting instead of rubbing against the workpiece surface to form chips. As such, at a given cutting depth, if the cutting edge is longer, the resulting chip will be thinner (in other words, a smaller principal offset will result in a thinner chip), and a higher feed should be used to maintain normal cutting. The Xcel blade is an innovation that takes heat resistant superalloy turning to new levels of performance, with advantages including better tool accessibility, reduced groove wear trends, reduced radial cutting force, and constant chip thickness.
In addition, from the point of view of tool wear, the groove wear of cutting edge is the main problem in turning heat-resistant super alloy. The formation of groove on cutting edge is especially obvious near cutting depth. This is especially true if the cutting edge is 90 degrees off the main Angle, or if the cutting depth is greater than the radius of the tip of the cutting edge. Oxidation wear at high temperature and room temperature is the main mechanism of cutting edge groove wear. The best machining properties can be obtained when the heat resistant superalloy is turned with a small main Angle turning tool.
This is the general background against which the blade is recommended to be cut at a relatively small principal Angle (45 degrees or less) when turning heat resistant superalloys.