The precision forging die of spiral bevel gear is processed and assembled in Qingdao Sanxing precision forging gear factory, and the precision forging process experiment of spiral bevel gear is carried out through the die. The assembly structure of the precision forging die without flash used in the experiment is shown in Figure 1, the gear die of precision forging die is shown in Figure 2, and the forming equipment is a 1000 ton friction press as shown in Figure 3.
The experimental process is as follows:
1) Precision sawing machine is used for blanking, and the blanking size is Φ 110mm × 163mm；
2) Place the blank in the less oxidation heating furnace and heat it to 1150 ℃;
3) Put the blank on the steam hammer for upsetting, punching and reaming in turn to complete the blank preparation;
4) Place the prepared blank on the forging die and carry out precision die forging and precision pressing successively through a 1000 ton friction press;
5) The gear teeth of the formed spiral bevel gear forging are immediately buried in the sand carbon mixture to reduce the oxidation of the gear teeth and prevent the cracks caused by the supercooling of the tooth surface;
6) The cooled spiral bevel gear forging is etched in 35% hydrochloric acid solution for 20 minutes to remove the oxide scale;
7) Locate the forging with teeth, turn the back cone and outer end face in turn, drill the fixed hole and finish the inner hole;
8) Positioning with the inner hole of spiral bevel gear, finish milling the tooth surface through Gleason gear milling machine;
9) Heat treat the bevel gear surface to HRC ~ 6358;
10) Fine grinding the inner hole by positioning the teeth;
11) Inspection and warehousing.
Figure 4 shows the spiral bevel gear forging formed by precision forging. The experimental results show that the process parameters optimized by numerical simulation meet the requirements of forming process, the precision forging die of spiral bevel gear meets the design requirements, the experimental forming effect of spiral bevel gear forging process is basically consistent with the results of numerical simulation, with good forming, full tooth shape, excessive smoothness of tooth root, no collapse Folding and other defects meet the use requirements.