The tool inclination method is used to process the hypoid gear. Since the number of teeth of the small wheel is 4, which breaks through the limit that the number of teeth of the small wheel cannot be less than 5 specified in the American AGMA standard. Therefore, the machining of the hypoid gear pinion will become more difficult. It is important to consider the interference between machine tool components, especially whether the tooth surface is undercut or the tooth top becomes sharp.
The tooth cutting test of hypoid gear pinion is also completed on gh35 gear milling machine. In order to meet the clamping of hypoid gear pinion blank on the machine tool, the positioning sleeve and fixture are specially designed together with gh35 machine tool. The use of these fixtures avoids the interference of cutter head, shaking table, machine bed and workpiece box in the tooth cutting process of hypoid gear pinion.
The machine adjustment and machining process of hypoid gear pinion machining are roughly as follows.
1.According to the size of fixture and hypoid gear pinion blank, calculate the actual installation distance of small wheel and install the blank processed by small wheel;
2.Adjust a series of parameters of hypoid gear pinion processing: installation angle, horizontal wheel position, eccentric angle, vertical wheel position, etc;
3.Input the machining parameters such as machine tool spread angle, roll ratio and feed rate during the machining of hypoid gear pinion in the NC window;
4.When machining concave surface, cut to the depth at one time;
5.When machining the convex surface, correct the tooth thickness and adjust the feed rate of the Y-axis of the machine tool to make the tooth thickness of the hypoid gear pinion meet the requirements.
The photos of the cutting tooth surface of the hypoid gear pinion are shown in Fig. 1, Fig. 2 is the cutting process of the hypoid gear pinion for tooth thickness correction, and Fig. 3 is the photos of the hypoid gear pinion completely machined.
The meshing condition of hypoid gears wheel and pinion placed together is shown in Figure 4. Because the focus of the test is to observe whether the tooth surface shape of the small wheel has changes such as undercutting and sharpening of the tooth top.