Machining process of transmission shaft
(1) dimensional accuracyIn order to determine the position of the shaft, the axle journal usually requires higher dimensional accuracy (IT5~IT7). The shaft neck dimensions of the assembly drive are generally low in accuracy (IT6~IT9).(two) geometry accuracyThe geometry precision of shaft parts is mainly refers to the journal, the outer cone, the cone Morse roundness, cylindricity, general tolerances should be restricted in size within the tolerance range. For the inside and outside surface with higher precision, the deviation of the drawing should be marked on the drawing.
Shaft parts are one of the typical parts often encountered in machines. It is mainly used to support transmission parts, transfer torque and bear load. Shaft parts are rotating parts, the length is greater than the diameter, generally by the concentric shaft of the cylindrical surface, cone surface, inner hole and thread and the corresponding end face. According to the shape of the structure, the shaft parts can be divided into optical axis, ladder shaft, hollow shaft and crankshaft.
Since the spindle of the lathe contains steps and inner holes, it can fully reflect the characteristics of the shaft parts, so the main shaft is used as an example1, the first two forging blank center hole, coarse outside the circle several stalls 2 steps; quenching; 3, semi refined car stall level, and then take the length of discharge allowance, Center for a total length of 4 cars; the central frame shaft through hole drilling; 5, lined both ends of the taper hole, both ends with bulkhead, central hole drilling, prepare for grinding; 6, finishing the file outer circle and step plane, put the grinding allowance, and the groove on the outer circle, car 7, each gear grinding chamfering; cylindrical and plane to the step size; 8, after the assembly processing the thread in the lathe.
Mutual position accuracyThe position accuracy of shaft parts is mainly determined by the position and function of the shaft in the machine. Generally, it is necessary to guarantee the coaxiality of the Journal of the assembly drive to the axle of the bearing, otherwise it will affect the transmission accuracy of the transmission parts (gears, etc.) and produce noise. The ordinary precision of the shaft, with its axis of support shaft journal radial runout is generally 0.01~0.03mm, high-precision axis (such as spindle) is usually 0.001~0.005mm.
