Symmetrical three-point expanding arbor fixture

Abstract

The invention discloses a symmetrical three-point expanding arbor fixture. Two small openings are formed in a sliding pin seat body and an expanding arbor is arranged in the sliding pin seat body; oneend of the expanding arbor is a cone and a first sliding pin passes through the small openings and is connected with the surface of the cone of the expanding arbor in a matching manner; the expandingarbor is capable of moving along the axis of the sliding pin seat body and jacking up the first sliding pin; a sliding taper sleeve sleeves the other end of the expanding arbor and one end of the sliding taper sleeve is a cone; a second sliding pin passes through the small openings and is connected with the surface of the cone of the sliding taper sleeve in a matching manner; the sliding taper sleeve is capable of moving along the axis of the sliding pin seat body and jacking up the second sliding pin; a shoulder part of a shoulder nut is connected with the sliding taper sleeve and the expanding arbor and the sliding taper sleeve can move relatively by the rotation of the shoulder nut. The fixture has the beneficial effects of being high in efficiency of clamping workpieces, good in clamping effect and capable of shortening the assistant time of production significantly.

Description

technical field [0001] The invention belongs to the technical field of metal cutting, and relates to a processing method for sleeve or sleeve parts and box parts with high processing requirements. Background technique [0002] Sleeve parts are important parts widely used in various fields such as machine tools, hydraulic systems and construction machinery. In order to ensure their working performance, high technical requirements are generally put forward for them, such as straightness, roundness, cylindricity and coaxial The degree and surface quality have corresponding technical requirements due to different use occasions. In the existing processing technology, the processing of sleeve parts has to go through a long processing process, using general fixtures to clamp, and gradually reducing the cutting amount, cutting force and clamping force, thereby reducing the clamping deformation error. The quality requirements are basically met, but such a process method leads to an ...

AI Technical Summary

Problems solved by technology

[0004] (1) The positioning and clamping method in the existing installation technology will cause clamping deformation for sleeve parts, large processing errors, and difficult to guarantee accuracy; During installation, the positioning reference is not easy to find, and the clamping force is not well controlled reasonably.

Excessive clamping force will cause clamping deformation, which is difficult to eliminate in the subsequent process; too small clamping force will cause the workpiece to loosen during processing, thereby changing the accuracy of the original positioning, resulting in positioning errors, and causing damage to the processing. The effect of precision

The main reason why these technical problems cannot be effectively solved is: when turning the outer circle of the sleeve, the three claws of the self-centering three-jaw chuck are clamped to cause clamping deformation of the sleeve. When the claws are opened, elastic recovery occurs, resulting in roundness errors; for coarse reference positioning, due to the large geometric shape error and surface roughness of the coarse reference hole, the positioning error is large; when the U-turn is installed, reference changes will cause reference misalignment errors

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