Double-bearing positioning fixture

Abstract

The invention discloses a double-bearing positioning fixture, which comprises a fixture body (1), a first supporting knuckle bearing (2), a second supporting knuckle bearing (3), a taper sleeve (5), a ball bearing (7), a gland (9), a compression knuckle bearing (10) and a mandrel (11). The taper sleeve (5) is arranged on the fixture body (1) through the ball bearing (7); the first supporting knuckle bearing (2) and the second supporting knuckle bearing (3) are oppositely arranged up and down so as to form a supporting knuckle bearing outer ring; a large excircle of the fixture body (1) is a convex spherical surface so as to form a supporting knuckle bearing inner ring; a convex spherical surface used as a compression knuckle bearing inner ring is arranged on the surface of the mandrel (11); a matched end of the gland (9) and the mandrel (11) is a concave spherical surface; and the compression knuckle bearing (10) and the concave spherical surface of the gland (9) are partially matched so as to jointly form a compression knuckle bearing outer ring. According to the double-bearing positioning fixture provided by the invention, the cost is effectively reduced, a fixture structure is simplified, and up-propping lower-pulling type floating compression is utilized, so that the characteristics of high processing rigidity, high accuracy and the like are realized.

Description

technical field [0001] The invention relates to the technical field of machining fixtures, in particular to a double bearing positioning fixture. Background technique [0002] Disc sleeve parts generally refer to flanges, end covers, through covers and other parts. These parts mainly play the role of support, axial positioning and sealing. The fixtures of this kind of parts generally adopt the following structures: 1. Spring expansion sleeves are used for positioning Or oil pressure centering and tightening; 2: Slip-fitting mandrel positioning or aligning the end face of the taper hole and pressing; 3: The end face support adopts rigid support pads or oil pressure balance supports, etc. The above structure has the following disadvantages: 1. The centering of the tapered hole expansion sleeve is unstable, and the oil pressure structure is complicated; 2. There is a gap in the sliding fit method, which cannot be precisely centered, and the alignment efficiency is low; 3. The r...

AI Technical Summary

Problems solved by technology

The above structure has the following disadvantages: 1. The centering of the tapered hole expansion sleeve is unstable, and the oil pressure structure is complicated; 2. There is a gap in the sliding fit method, which cannot be accurately centered, and the alignment efficiency is low; High and oil pressure balance structure is complex and the failure rate is high

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