Core expansion type positioning mandrel

Abstract

The invention discloses a core expansion type positioning mandrel, and belongs to the technical field of machining. The core expansion type positioning mandrel is a multi-section core expansion type positioning mandrel. A front end nut, a pressing ring, a front end elastic piece, a middle elastic piece, a pressing sleeve, a conical block, a rear end elastic piece, a gland and a rear end nut are sequentially connected through a shaft from right to left. The shaft is a rotary body and is composed of multiple cylindrical sections. The two ends of the shaft are provided with central holes and used for being connected with a machine tool. The core expansion type positioning mandrel is used for machining an outer profile of a hollow thin-walled thin and long shaft; according to a conical body core expansion and elastic deformation principle, by embedding the core expansion type positioning mandrel in the hollow thin-walled thin and long shaft, the positioning gap is eliminated when the outer profile of the hollow thin-walled thin and long shaft is machined, the problem that the outer profile of the hollow thin-walled thin and long shaft can not be easily turned and ground is solved, the core expansion type positioning mandrel is convenient to operate, reliable in positioning and novel in structure, and the machining requirement of the thin-walled thin and long shaft is met.

Description

technical field [0001] The invention belongs to mechanical processing technology, and relates to a center-expanding positioning mandrel. Background technique [0002] The catheter is one of the parts of the aero-engine. It is a hollow thin-walled slender shaft with a wall thickness of 1.5-2.5mm, an inner hole diameter of Φ90-Φ130mm, and a length of 800-1100mm. It is processed by lathes and grinders. appearance. A certain type of engine duct such as figure 1 As shown, it is a hollow thin-walled elongated shaft with a wall thickness of 1.5mm, an inner hole diameter of φ109mm, and a length of 827mm. The outer surface is processed by turning and grinding in two processes. It is necessary to design a set of positioning mandrels to meet the two requirements. After processing, the concentricity between the outer surfaces after processing is Φ0.1 (free state). Due to the poor processing technology of thin-walled parts and easy deformation, the concentricity Φ0.1 (free state) is fo...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems existing in the prior art, the present invention provides a center-expanding positioning mandrel, which is used for processing the outer surface of the hollow thin-walled elongated shaft, eliminating the need for hollow thin-walled elongated shafts. The positioning gap when machining the outer surface solves the problem that the hollow thin-walled slender shaft turning and grinding the outer surface are not easy to process and guarantee

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