Fixture for inner hole of metal cutting large-caliber thin-shell drum-shaped workpiece
A metal cutting and large-diameter technology, applied in the field of fixtures, can solve problems such as dimensional deformation and low processing quality
Inactive Publication Date: 2010-06-23
SHAANXI AUTOMOBILE GROUP
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[0003] The object of the present invention is to provide a fixture for metal cutting the inner hole of a large-diameter thin-shell drum-shaped workpiece, so as to overcome the defects of dimensional deformation and low processing quality caused by uneven clamping force of existing tooling fixtures
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[0014] The present invention will be further described below in conjunction with embodiment.
[0015] In this embodiment, a jig for turning the inner hole of a brake drum of an STR automobile axle is taken as an example for further detailed description.
[0016] The brake drum of the STR automobile axle belongs to a drum-shaped rotating part with a large diameter and a thin shell. Thin-walled parts. In the original processing technology, when machining the inner hole φ420±0.11, CNC vertical lathe six-point hard jaw chuck is mostly used. Since the brake drum is a thin-shell workpiece, the hard jaw chuck cannot guarantee that the workpiece is evenly stressed when it is clamped. As a result of the turning process of the inner hole, the ellipticity of the inner hole of 0.15-0.20mm cannot meet the technical requirements of the drawing due to the deformation of the workpiece. In order to solve the defects existing in the existing fixtures, the present invention utilizes the princi...
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The invention relates to a turning fixture in a metal cutting process, in particular to a fixture for turning an inner hole of an STR automobile axle brake drum. The fixture is characterized in that: a floating clamping claw which is arranged on a tri-claw is that auxiliary levers are respectively arrange at the two ends of a main lever, the main lever is articulated at a bracket by a rotating shaft, the auxiliary levers are articulated at the two ends of the main lever by shaft pins, and the bracket is fixedly arranged at the tri-claw. An original fixed hard-claw fixture is improved into the multi-point floating clamping claw, which overcomes the disadvantage that size distortion occurs after the processing and the processing requirement cannot be met due to non-uniform distribution of clamping forces; moreover, as a lever type floating structure is utilized, the fixture has good tightening self-alignment property. With reasonable and compact structure, the fixture has obvious significances in lowering the defective product rate of a workpiece, improving the processing quality and increasing the production efficiency.
Description
technical field [0001] The invention relates to a tooling fixture in the metal cutting process, in particular to a fixture for turning the inner hole of a STR automobile axle brake drum (a metal cutting fixture for the inner hole of a drum-shaped workpiece with a large diameter and thin shell). Background technique [0002] In the metal turning process, for the turning of the inner hole of the thin-shell workpiece, the key point is how to control the dimensional accuracy of the inner hole after processing, especially for the inner hole of the large-diameter thin-shell drum-shaped workpiece . At present, the general-purpose tooling mostly adopts three-jaw or multi-jaw chuck-type fixtures. Although this kind of fixture is simple and convenient to use, due to the uneven force on the workpiece during clamping, it will cause deformation of the aperture size after processing. As a result, It is often scrapped because the dimensional accuracy of the workpiece after processing does...
Claims
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IPC IPC(8): B23B31/02B23B31/103
Inventor 时喆
Owner SHAANXI AUTOMOBILE GROUP