For Ti-6Al-4V titanium alloy large diameter thin-walled thread turning processing large deformation, and the diameter value control strictly, high surface quality requirement, the optimization tool and feed way, based on the use of mechanical analysis and the simulation method to complete the tooling optimization design; Through the study of tool wear test and chip shape, a suitable combination of machining parameters is determined. Compared with the test results of thread diameter, the better thread detection method was determined and the qualified thread was machined. The thread diameter of the part is M320, the pitch is 4 mm, the wall thickness is only 3 mm, the diameter ratio is 102, and the dimension and contour accuracy of the type face are higher, and the diameter of the thread has the requirement of size control. Ti-6al-4v titanium alloy has good plasticity and strong ductility and poor thermal conductivity, which is difficult to process. The thin wall features make it difficult to control during the process of processing.
It is not mature for the processing technology of large diameter of titanium alloy, but its price is more expensive, so it is necessary to optimize the processing technology to ensure the qualified rate of production. For the thread turning processing of thin-walled tubular parts, this article from the viewpoint of mechanics analysis and simulation to complete tooling design optimization, combination of cutting tool wear test and chip shape, the reasonable cutting parameters combination, combined with the thread test results to choose the proper test methods. Thread turning is a kind of forming turning, because of the wedge-shaped contact of threading tool and tubular workpiece, when the cutting depth increases, the length of cutting edge of participating cutting increases greatly. The main cutting edge and the auxiliary cutting edge are involved in cutting. The strong plastic characteristics of the workpiece material make the friction coefficient larger, so the turning condition of the titanium alloy tubular outer thread is relatively poor.
Through the analysis of mechanical testing and deformation analysis, it is concluded that the radial deformation of the tubular workpiece is large, and the internal support should be strengthened during the processing. In the actual turning process, the diameter of the thread is about 0. 03 mm, it has certain verification effect on this conclusion. Optimized tooling as shown in figure 6, installation position of the cone surface, wedge ring and clamp a work together, make the workpiece and the wedge ring contact state is better, to ensure uniform radial workpiece during the process of screw thread processing, and in different circumferential position supported by the wedge ring workpiece.
There is no wedge ring and pressure plate in the original tooling, and the installation of the disc is cylinder. The diameter of the workpiece and the mounting plate of the clamping device is unavoidable, so the residual stress and machining deformation will be caused.
