Multi-rolling-needle pitch circle fixture for gear welding and application method thereof

Abstract

The invention discloses a multi-rolling-needle pitch circle fixture for gear welding and an application method thereof. The fixture comprises a support ring, multiple bushings, multiple pitch circle rolling needles and multiple riveting steel wires; inclined surfaces as many as positioning gears are machined on the support ring; and one bushing and two pitch circle rolling needles are fixed on one inclined surface of the support ring through the riveting steel wires. As welded parts are different from general disc gear parts, the support ring is structurally optimized, and one end is opened; and the problems of stop of the end surfaces of gears and incapability of once machining inner holes and end surfaces can be solved through developing the novel multi-rolling-needle pitch circle fixture. In order to increase the positioning clamping area during machining, the tooth number and the positioning pitch circle rolling needle number are the same; and under any clamping condition, a traditional jaw only can clamp one pitch circle rolling needle, and at least three pitch circle rolling needles can be clamped according to the multi-rolling-needle pitch circle fixture for gear welding. Finally, 0.3 mm gaps are kept from the measurement over pins M of the welded parts, so that quick unloading is convenient, and the large-batch production demands are satisfied.

Description

【Technical field】 [0001] The invention relates to a multi-needle roller pitch circle fixture for welding gears and a using method thereof. 【Background technique】 [0002] At present, welded gears are the key gear parts of light trucks and military gearboxes, and the pass rate of the gear precision after heat treatment is extremely high. Because the gear and the synchronizer ring gear are welded together after the weldment is welded, the pitch circle of the weldment cannot be used as the positioning reference for processing. Usually, only the outer circle of the weldment gear can be clamped. After heat treatment, the weldment cannot be used as a reference for each other. Tooth accumulation and radial jump are out of tolerance, resulting in gear precision out of tolerance, and the pass rate of final inspection products is 60%. In response to this situation, the principle of one-to-one correspondence between pitch circle needles and welded part tooth grooves is used, and the n...

AI Technical Summary

Problems solved by technology

Because the gear and the synchronizer ring gear are welded together after the weldment is welded, the pitch circle of the weldment cannot be used as the positioning reference for processing. Usually, only the outer circle of the weldment gear can be clamped. After heat treatment, the weldment cannot be used as a reference for each other. Tooth accumulation and radial runout are out of tolerance, resulting in gear precision out of tolerance, and the pass rate of final inspection products is 60%

Images