Automatic fixture for internal expansion positioning and end face compression of thin-walled inner ring gear parts

Abstract

The invention discloses an automatic fixture for clamping a thin-wall ring gear part through internal expansion positioning and end surface compression. The automatic fixture is characterized in that a connecting disc is mounted on a spindle flange of a lathe, a gear internal expansion elastic part is mounted on the end surface of the connecting disc through a spigot, an axial positioning sleeve is mounted outside the gear internal expansion elastic part in a sleeving manner, the gear internal expansion elastic part is provided with an inner cone hole, an open slot is formed in the inner cone hole section and forms a conical surface expansion structure with an expansion core, and the thin wall ring gear part is mounted on outer teeth of the gear internal expansion elastic part and is tightly close to the end surface of the axial positioning sleeve; the thick end of a tension screw is connected with a lathe pull rod and locked by a pull rod round nut, and the expansion core, a belleville spring and an end surface press ring are mounted at the thin end of the tension screw and tightly pressed by adjusting nuts; the end surface press ring provides axial thrust for the expansion core through the belleville spring, so that the gear internal expansion elastic part expands to eliminate mounting clearance between the gear internal expansion elastic part and a part, and an open press plate tightly presses the end surface of the thin-wall ring gear part to realize clamping. With the adoption of the automatic fixture, the thin-wall ring gear part can be positioned accurately.

Description

technical field [0001] The invention relates to a tooling fixture in the mechanical processing industry, more specifically to an automatic fixture for internal expansion and positioning of a thin-walled inner ring gear part used in an automatic lathe and for pressing the end face. Background technique [0002] When automatic lathes process the outer circle of thin-walled internal ring gear parts, power chucks generally cannot be used, and internal expansion elastic clamps or end-face clamps are required. Due to the small stiffness of the thin-walled inner ring gear parts, the existing internal expansion elastic fixtures will still cause clamping deformation of the parts and affect the machining accuracy; the machining accuracy of the pressure end surface fixture depends on the radial positioning accuracy of the parts on the fixture, and To load and take out parts on the fixture, there must be a radial gap between the fixture and the part. The position of this radial gap is r...

AI Technical Summary

Problems solved by technology

Due to the small stiffness of the thin-walled inner ring gear parts, the existing internal expansion elastic fixtures will still cause clamping deformation of the parts and affect the machining accuracy; the machining accuracy of the pressure end surface fixture depends on the radial positioning accuracy of the parts on the fixture, and To load and take out parts on the fixture, there must be a radial gap between the fixture and the part. The position of this radial gap is randomly changed when the part is clamped. Therefore, the radial installation gap of the pressure end tooling affects the processing precision

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