The processing methods are mainly these two methods. The forming method is to directly use the gear forming milling cutter to mill out the tooth valley. The advantage is that the gear can be obtained on the milling machine, even if the equipment is limited. Consider. There are many shortcomings. In order to reduce the number of tools, the number of teeth is divided into segments, and one tool is used within a segment of the number of teeth. Therefore, the tooth profile will bring systematic errors. The generation method uses the generation motion of the cutter and the gear to process. Gears. Mainly include hobbing and gear shaping. Gear hobbing is processed by simulating the meshing of a worm gear. Gear shaping is processed by simulating the meshing of two gears. Gear hobbing is often used because the tooth shape of the hobbing hob is Straight line, easy to process, and the gear shaping tool is a shovel-backed gear, and the tooth shape is involute, so it is not so convenient to process. However, gear shaping can be used in some positions that hobbing cannot process, such as internal teeth. Double or multi-connected gears whose retraction distance is too short. In the finishing process of gears, there are shaving and gear grinding. The same is the generation method. The advantage of shaving is high efficiency but it cannot be used for hard tooth surfaces. Gear grinding is On the contrary, the processing and development method is actually the Fan Cheng method. It is currently the most commonly used method in gear processing. It is processed based on the principle that when a pair of gears are meshed for transmission, the tooth profiles of the two wheels are mutually exclusive yoke curves. Processing fixtures 1. Sawing: round steel 20crmnti cutting, 2. turning, rough turning, all flat surfaces and outer circles, leaving 1-2 mm margin for the inner holes, fine turning flat surfaces, outer circles, and inner holes to the drawing size. 3. Insertion, module 6, tooth number 20, tooth insertion 4. Heat treatment and tooth surface quenching. 5. Inspection and storage. But in practice, the tooth surface is generally not quenched. The pinion is directly quenched and tempered with an overall hardness of 250--280. The strongest processing place is in Jiangyin City, Jiangsu Province and its surrounding areas, where there is the largest conical arc tooth gear grinding machine in China. and gear milling machines, equipped with inspection equipment, some imported from the United States. The same is true for cylindrical gears. From small grinding numbers to large grinding numbers, they can be processed with equipment imported from Germany and inspected by American inspectors. There are many restrictions on the choice based on this. Generally speaking, the low-precision ones use gear shaping, the high-precision ones use hobbing, and the even higher ones use hobbing + gear grinding. Then they are divided according to size. Small ones can be cast directly, and extra large ones can be cast into blanks and then the teeth can be processed. Then select the heat treatment conditions according to the use conditions. Use the sand rolling process for the processing process. Put the parts and sand in a container and mechanically roll them to solve the problem. Beijing No. 1 Machine Tool Factory used this process to remove chamfering burrs. 1. The gear chamfering machine may have a problem with the shape of the chamfering tool blade. 2. Manually operate a hand electric drill with a conical grinding wheel for burring. 3. Shot peening. Processing process The processing technology of gears (taking No. 45 steel as an example): 1. Blank blank cutting 2. Rough turning 3. Quenching and tempering treatment (to improve the toughness of the gear shaft and the stiffness of the shaft) 4. Fine turning of the gear blank to size