Small Module Spiral Bevel Gear Tooth Surface Design And Its Mold Manufacturing

For its strong bearing capacity and the advantages of the large transmission ratio, the spiral bevel gear occupies very important position in the intersection of shaft parts industry. Small-module spiral bevel gear is widely used in electric tools, sewing equipment industries, and the market demand is huge. The size of the small module spiral bevel gear is small, and the pinion cannot adopt single-face method machining with double-face method machining of the gear to match, and it is only machined by double-face method, this combination is called duplex method. However, with the continuous improvement of the relevant overall performance, the requirements of small-modulus bevel gear meshing performance are also increasing. In the past, the machining cycle of small-module spiral bevel gear machining is short, but its machining characteristics cannot meet the good tooth surface meshing, and they are unable to separate control pairs of tooth surface meshing quality, thus tooth surface meshing is not stable, the noise is big and the meshing performance is poorer.In order to improve the meshing performance of small-module spiral bevel gear， in the paper, the pinion is machined by using double-face milling, the gear is machined by powder metallurgy forging, and the pinion is machined by double-face method, and on the basis of the gear meshing theory. The gear tooth surface with good matching meshing performance is built, the gear is largely produced by powder metallurgy method. The paper studies from the following aspects:1Based on the local synthesis, TCA technology, the gear single-face method is designed, and the pinion double-face method of machining parameters makes the machining parameters of gears mesh have good performance in theory and creates theoretical basis for two tooth surface precision transmissions. Take for example a pair of gears, designs machining parameters and creates the3d model of gear pair on the basis of specific meshing tooth contrast. 2According to the machining parameters of gears, the tooth surface machining coordinate system is established. By the cutting tool and the machining position and movement relationship between tooth surfaces, tooth surface equation is obtained, and a mathematical model of tooth surface machining is built. Using the TCA analysis of tooth surface contact, the numerical control module in UG trajectory simulation of the gear mold machining, the processing code is generated.3The powder metallurgical standard gear machining method is discussed in this paper, the standard gear is machined by the gear milling machine and by the five axis high precision CNC machining center.According to the three-dimensional model in the case of UG, the choice in the numerical control machining center on the same as the3d model of standard gear is made.4Machining test of standard gear. The machining of medium-modulus gear is presented instead because of the restriction of the machining conditions. According to the parameters and the3D tooth surface model, the NC machining program is created, and the standard gear is milled by the gear milling machine. And the standard gear is checked on rolling inspection machine, the tooth contact pattern is analyzed.