Tangible joint control method for heat-proof shaft in axle box bearing assembly of passenger car

Abstract

The invention provides a tangible joint control method for a heat-proof shaft in assembly of an axle box bearing of a passenger car. According to the method, the phenomenon that the bearing is not in normal position in the axle box is completely eradicated, the installation of unqualified accessories is effectively controlled, the improvement of the size measurement precision of an operator is deduced, and meanwhile, a new thought is provided for the verification of the product quality by applying the logic back-stepping of associated data.

Description

technical field [0001] The invention relates to the technical field of measurement and control, in particular to a tangible joint control method for assembly of heat-resistant axles of axlebox bearings of passenger cars. Background technique [0002] The axle is the leg of a railway passenger car, which carries the safety of passengers' lives and properties. As the axle box device is the core component of the axle, the assembly quality of the axle box bearings is particularly important. In the entire axle box bearing assembly process, only 3 pressure plates are needed, and the front cover of the axle box needs 4 bolts to fasten. In the fastening process of these two groups of bolts, uneven tightening of the bolts in any group will cause the bearing to be out of position in the axle box, and eventually cause the hot shaft to fail. In order to prevent uneven tightening of bolts, the following control measures are currently in place. [0003] 1. Manual torque wrench is used f...

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Problems solved by technology

[0003] 1. Manual torque wrench is used for tightening. When the tightening torque reaches the set value, the operator stops tightening after the sound of dripping is generated. However, the inertia input of the torque cannot be cut off after the torque wrench reaches the predetermined value, so the tightening of each bolt is caused. The tightening torque is different, and there is a phenomenon that the bolts are artificially tightened with super torque in order to make the six sides of the bolt reach the predetermined position

[0004] 2. Using intelligent torque trigger, three bolts or four bolts are tightened at the same time, and the bolts stop tightening after each bolt reaches the predetermined torque value; however, the intelligent torque trigger equipment is expensive, and it cannot solve the problem of screw shaft rotation when the nuts of the four bolts on the front cover are tightened. It cannot solve the problem that when the axle end bolts of the axle pressure plate in the passenger section are fastened, there are certain requirements for the positioning of the screw rod in six directions, and it cannot solve the problem that the bolt thread fit resistance is large and the tightening torque has reached the standard. The actual bolts are not Unfastened problem, the intelligent torque trigger device introduced by Wuchang Bus Depot was finally disabled due to the above problems

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