The basic knowledge of titanium alloy parts processing

Titanium alloy, whose specific gravity is small, determines its low quality, high strength and thermal strength, hardness and high temperature resistance, and a series of excellent physical and mechanical properties such as seawater and acid-base corrosion, which determine it no matter what environment it is in. It can be used. In addition, the deformation coefficient is very small, so it has been widely used in aerospace, aviation, shipbuilding, petroleum, chemical and other industries. Because titanium alloy has the above differences from ordinary materials, it is also determined that it is very difficult in precision machining. Many machining factories are reluctant to process this material, and do not know how to process this material. . Due to the small deformation coefficient of titanium alloy, high cutting temperature, high tool tip stress and severe work hardening, the tool is prone to wear and chipping during cutting, and the quality of cutting is difficult to guarantee. How to do cutting? When the titanium alloy is cut, the cutting force is not large, the work hardening is not serious, and it is easy to obtain a better surface finish, but the titanium alloy has low thermal conductivity, high cutting temperature, large tool wear, and low tool durability. The tool should be selected with titanium Tungsten-cobalt carbide tools with low chemical affinity, high thermal conductivity, high strength, and small grain size. In the turning process of titanium alloy, chip breaking is a difficult problem in machining, especially in the processing of pure titanium. In order to achieve the purpose of chip breaking, the cutting part can be ground into a full arc chip flute, shallow in front and deep in the back, narrow in front The back width makes it easy for the chips to be discharged outwards, so that the chips will not be wound on the surface of the workpiece and cause scratches on the surface of the workpiece. The cutting deformation coefficient of titanium alloy is small, the contact area between the tool and the chip is small, and the cutting temperature is high. In order to reduce the generation of cutting heat, the rake angle of the turning tool should not be too large. The rake angle of the carbide turning tool is generally 5-8 degrees. Due to the high hardness of titanium alloy, in order to increase the impact resistance of the turning tool, the clearance angle of the turning tool should not be too large, generally 5 degrees, in order to strengthen the strength of the tip part, improve the heat dissipation conditions, and improve the impact resistance of the tool , Adopts a negative blade inclination with a large absolute value. Control a reasonable cutting speed, not too fast, and use a titanium alloy special cutting fluid for cooling during the machining process, which can effectively improve the durability of the tool and select a reasonable feed rate.