The method of shortening the technological process

The method of shortening the process flow in numerical control machining

Figure 1, process 1

Figure 2, process 2

a sealing seat that requires mass turning. The blank is forgings, and the profile shape after turning is as shown in Figure 2, vicrylmesh reg The skin grafting material and dura replacement are shown in the isoline. The original process flow is 3 rough turning, 1 semi fine turning, 2 fine turning, a total of 6 processes. When C7620 hydraulic semi-automatic lathe and c7220 profiling lathe are used, the ovality of the outer diameter after machining sometimes cannot meet the requirements of 0.12mm in the drawing. Through analysis and repeated tests, the process flow is shortened. Only three processes are needed to complete the rough and finish machining on the experimental machine. Because the demand for data collection rate is not too high, the machining accuracy also meets the requirements of the drawing, and only one CNC lathe is used. The first process is shown in Figure 1. Reduce the inner diameter and use C7620 semi-automatic lathe to turn surfaces a and B and chamfer C and D. The second process improves tissue growth at the same time. See Figure 2. Use a double turret CNC lathe to clamp the rough turned outer diameter. Install two 80 on the upper tool rest. The outer diameter knife of the end face of the equilateral diamond blade, T1 is equipped with a blade with a side length of 16, which is used for rough turning of F, e and K chamfers, and the second process in Figure 2 is equipped with a blade with a side length of 12, which is used for fine turning of these three places. Install two self-made tool holders W1 and W2 on the lower tool rest, and install 55 on their respective heads. The outer diameter of the end face of the equilateral rhombic blade is the same as the model of these two knives and the side length of the blade. Only the tip arc radius of T3 blade is 1.6mm, and that of T4 blade is 1.2mm. T3 and T4 can be turned after rough turning and fine turning of H, J surfaces and l, m and N angles respectively, and corresponding NC machining programs are compiled. In the third process, C7620 semi-automatic lathe is used, the inner diameter G is clamped with spring fixture, and the end face f is used for positioning, and the outer diameter a, end face B and outer angle c are finished. Through the practice and application of mass production, the process flow is shortened by half with the above method, which is successful