Clamping fixture for machining positioning-free concentric holes

Abstract

A clamping fixture for machining positioning-free concentric holes, falling into the technical field of a machining process for machining precision concentric holes in a positioning-free mechanical spare part, comprises a bent plate, a clamping fixture body, a positioning pin, press plates, an indexing body, a clamping press plate, a clamping screw and a positioning body, wherein the bent plate is a right-angle plate formed by connecting a horizontal plate with a vertical plate, a reinforcement rib is arranged at the outer ends of the horizontal and vertical plates, a through hole is arranged in the vertical plate, the clamping fixture body is arranged at the outer side of the vertical plate and has a round disc shaped base, the base is provided with a central through hole corresponding to the bolt hole in the vertical plate of the bent plate, the base and the peripheral wall of an irregular-shaped annular body are integrally connected to form the clamping fixture body, the part of the irregular-shaped annular body corresponding to the through hole of the base is also provided with a through hole, the bottom end of the positioning pin is located in the irregular-shaped annular body and the other end of the positioning pin sequentially passes through the irregular-shaped annular body and the base to get into threaded connection with the bolt hole of the vertical plate, and the positioning pin can movably connect the clamping fixture body to the vertical plate of the bent plate.

Description

technical field [0001] The invention relates to the technical field of processing technology for processing precision concentric holes for non-positioning mechanical parts. Specifically, it is a special mold for processing concentric holes without positioning. Background technique [0002] At present, there is a double U-constant velocity center fork auto part in the auto industry, which is a new product of four-drive auto parts. One of the parts is called the transition connection fork, also known as the part of the H fork. The structure of the transition connection H fork It is more complicated, especially there are four concentric holes on both sides, the concentricity is required to be within 0.05mm, and the precision is very high. Processing is very difficult. Ordinary processing technology is difficult to guarantee the processing requirements. See figure 1 The automobile constant velocity connection product H fork has the following structure: it has a spherical ann...

AI Technical Summary

Problems solved by technology

It is very difficult to process such a symmetrical through hole, not only because the shape of the part is complex, and there is no reliable reference plane, it is difficult to meet the accuracy requirements if the positioning reference is lost during repeated processing

Foreign countries generally use CNC machine tools for processing, which has high costs and low profits; while using ordinary machine tools for processing, not only the processing cycle is long, the processing is difficult, the quality accuracy cannot be guaranteed, and the processed products have no profit

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