Master-slave cooperative positioning and clamping device for realizing near-zero sliding of high-speed rail gear shaft

Abstract

The invention discloses a master-slave cooperative positioning and clamping device for realizing near-zero sliding of a high-speed rail gear shaft, which comprises a master positioning tip assembly and a slave positioning shaft neck chuck assembly, the master positioning tip assembly is used for realizing axial positioning and radial positioning of the gear shaft, and a chuck, a chuck positioning plate, a lower tip and a round nut are clamp bodies. The clamp body is connected with a motor shaft through a transmission system, the slave positioning shaft neck chuck assembly is used for achieving circumferential positioning of a gear shaft, one end of the slave positioning shaft neck chuck assembly clamps the gear shaft, the other end of the slave positioning shaft neck chuck assembly is fixedly clamped with a chuck, and six degrees of freedom of the gear shaft are limited through master-slave cooperative positioning. By using the device, the gear shaft is convenient to assemble and disassemble and high in positioning precision; through the technical scheme, near-zero sliding positioning and clamping between the gear shaft and the clamp body are achieved, gear shaft impact and sliding caused by sudden change of the speed of the clamp body are restrained, then highly synchronous rotation of the gear shaft and a motor shaft is achieved, and the high shape precision and surface quality of the tooth surface of the gear shaft during ultra-precision numerical control polishing are guaranteed.

Description

technical field [0001] The invention relates to the field of gear manufacturing, in particular to a master-slave cooperative positioning clamping device for realizing near-zero sliding of a high-speed rail gear shaft. Background technique [0002] High-speed rail is a golden business card made in China. As the core component of high-speed train energy transmission, the gear transmission system's reliability and stability directly affect the safe operation of the train. At present, there are more than 50,000 sets of high-speed rail gear transmission systems in service in China, and 80% of the existing problems and failures come from lubrication failure. For the gearbox of the next-generation high-speed train with a speed of 400 kilometers per hour, the traditional lubrication technology is difficult to support the technical upgrade and product generation of the gearbox. Therefore, a new technological change is proposed to replace the traditional lubrication with solid-liquid...

AI Technical Summary

Problems solved by technology

[0006] 1. The gear shaft is clamped by a three-jaw chuck. The center line of the gear shaft is easy to deviate from the center line of the chuck, which cannot guarantee the high shape accuracy and surface quality of the tooth surface of the gear shaft during polishing.

[0007] 2. If the clamping force of the three-jaw chuck is too large, the surface of the gear shaft will be clamped. If the clamping force of the three-jaw chuck is not enough, impact and sliding may occur between the chuck body and the gear shaft, resulting in deviation of the machining track. High shape accuracy and surface quality of the tooth surface of the gear shaft during polishing cannot be guaranteed

[0008] The existing positioning and clamping devices used in gear shaping finishing usually use liquid plastic centering and clamping methods, and the gear shaft is installed in a thin-walled sleeve based on the outer cylindrical surface and end surface of the gear shaft. The space between the thin-walled sleeve and the clamp body is filled with liquid plastic. By tightening the screw, the plunger moves to squeeze the liquid plastic, so that the liquid plastic is stressed, and the thin-walled sleeve produces uniform elastic deformation, and the gear shaft is centered in the clamp. However, in the actual application process, the structure of the device is complicated, there are many steps for loading and unloading the gear shaft, and the manufacturing and maintenance costs are high

[0009] As mentioned above, none of the existing positioning and clamping devices can meet the technical requirements of ultra-precision CNC polishing of the tooth surface of the gear shaft. Problems with the device

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