One end of the sun gear is a gear that meshes with the planet wheels, and the other end is a coupling gear or an involute spline. In order to facilitate the machining of the gears, the ends of the sun gear blank must be lengthened and the center hole is milled at both ends to ensure the requirements of milling or grinding. Gears that mesh with the planet wheels require higher accuracy. The tooth rows of the teeth must be ground to achieve the 7M accuracy requirements. Involute spline hob or standard gear hob machining, that is, hobbing and nitriding. Before nitriding, all the steps of the workpiece must be processed, and the processed parts at both ends are cut off, then nitrided, and the tooth shape is no longer processed after nitriding.
Due to the high hardness of the tooth surface, the amount of deformation of the carburizing and quenching is also large, and the grinding tooth margin must be correspondingly increased. The large amount of allowance, but also to ensure the grinding efficiency, is bound to increase the amount of cutting. After the grinding allowance is increased, cracks will be generated on the surface of the gear teeth due to the thermal stress during grinding. Most of these cracks are cracks, and a few are perpendicular to the direction of grinding. Determines the accuracy of the position of the mandrel. The deformation of the planet carrier causes the planetary wheel axis deflection to cause load concentration on the tooth width, which reduces the load carrying capacity of the reducer and generates noise and vibration. Therefore, the design of the planet carrier must be reasonable, and the processing must also ensure its accuracy. The structural form of the planet carrier can be divided into a monolithic structure, a welded structure, and a side panel detachable type. At present, more on-site structure is adopted. Annealing must be performed after casting to eliminate internal stress, but this type of carrier has a large amount of machining and a large loss of metal. The machining accuracy of the planetary axle hole of the planet carrier is relatively high. Usually, the machining center machine hole is used. When the hole is used, it must be aligned with the inner hole or the outer circle of one end of the carrier, and the coaxiality with the machine tool spindle. . Within olmm, the machine tool spindle at this time serves as the starting point for machining. The numerical control device of the machine tool ensures the positional accuracy of the planetary wheel shaft hole, and it is not necessary to use the coordinate sharp bed. When machining with a coordinate bed, the machining accuracy between the hole and the hole can be as high as 15 mm according to the specifications, precision and actual working conditions of the machine. However, this machine tool has high precision and is only used in a small number of single-piece production.
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