The problems existing in the processing of titanium alloy fasteners

Corrosion problem. During the installation of titanium alloy fasteners, it is easy to form a certain gap, so that there will be an inflow of surface paint between metal air strikes, which leads to fasteners being vulnerable to clothing during the production process. During subsequent use, the connection tightness is affected. The main reason for the corrosion resistance of titanium alloy material is that there is a protective oxide film on its surface. This film can effectively protect the titanium alloy inside the material from oxidation, thereby improving the corrosion resistance of the titanium alloy material.

Problems in turning processing. Titanium alloy material is difficult to process materials, thermal conductivity is very poor. The heat generated in the machining process will not spread through the parts and machine structure, but concentrate in the cutting zone, there is a strong notch sensitivity, which may lead to edge collapse and deformation; The cutting edge becomes dull will produce even higher heat and further reduce the tool life. The high temperature generated during the cutting process will also cause the workpiece to continue to harden, which will affect the surface integrity of titanium, and may lead to the geometric accuracy of the parts is not accurate, and seriously reduce its fatigue strength. In general, in reasonable machining conditions, the turning process is not difficult. If it is for mass production, continuous cutting, and metal removal is relatively large cutting, need to use carbide tools; When forming cutting or cutting, it is necessary to adjust the steel tool reasonably, and use cermet tools if necessary.

Precision of mechanical processing of titanium alloy fasteners. The precision requirements for machinery will be higher. In mechanical production, because the tool is in a working wear state during each production process, and calibrated according to the program, the density of titanium alloy fasteners is higher, the tool is easily subjected to wear during the processing, under the wear state, the tool is still processed according to the program. It is easy to cause the precision of tight parts to be affected during the processing. If the precision of the fastener is not strictly controlled within the error range during the entire processing process, titanium alloy can not be closely connected with other materials in the process of use, which has a certain impact on the later use. Improving the accuracy of titanium alloy fasteners in the machining production process is a major problem to be overcome during the production process. For example, the fastener process products shown in the figure are made in a high-precision production workshop, and the connection performance of this product is better.