Positioning clamping device for workpiece

Abstract

The invention relates to a positioning clamping device for a workpiece. A spindle is mounted at the center of a base; the spindle is kept vertical to upper and lower planes of the base; a plurality of guide rail slots scattering from the center of the base to the periphery are formed on the upper plane of the base; slide blocks are mounted in the guide rail slots; connecting rods and a connecting sleeve are mounted on the spindle; corresponding fork-shaped lugs are formed on the periphery of an outer circle of the connecting sleeve; one ends of the connecting rods are hinged with the corresponding slide blocks through pin shafts; and the other ends of the connecting rods are hinged with each other through the pin shafts and the fork-shaped lugs on the connecting sleeve. The end parts of the connecting rods are hinged with the slide blocks through the pin shafts, the slide blocks only can move in the fixed guide rail slots, a threaded hole is formed in the middle of the spindle, a bush is mounted on the connecting sleeve, a thrusting bolt is screwed into the threaded hole in the middle of the spindle from a middle hole of the bush, and a function of pressing the connecting sleeve is achieved, so that the purpose of supporting an inner circle of the workpiece through the slide blocks is achieved.

Description

technical field [0001] The invention relates to a positioning and clamping device, in particular to a workpiece positioning and clamping device. The utility model belongs to the technical field of machine tools and lathes. Background technique [0002] At present, in the metal cutting process, in order to cut the outer circle of the annular workpiece, the annular workpiece to be processed must be positioned on the machine tool used in advance. Among all the current positioning methods, there are mainly: one is to use the method of universal chuck for positioning; the other is to use the method of bolt positioning and manual correction for positioning; the third is to use the method of elastic chuck for positioning; the fourth is to use the method of mandrel position. [0003] Among the above-mentioned positioning methods, although the method of using a general-purpose chuck has the characteristics of high precision, the investment cost of the chuck is generally high, and t...

AI Technical Summary

Problems solved by technology

[0003] Among the above-mentioned positioning methods, although the method of using a general-purpose chuck has the characteristics of high precision, the investment cost of the chuck is generally high, and there is generally no corresponding large-sized chuck for large-diameter ring workpieces; The method of bolt direct positioning and manual correction is relatively simple, but it has high labor intensity and low productivity. At the same time, due to human negligence, it often happens that the workpiece is not clamped and the clamping deviation exists, resulting in corresponding quality defects.

In the positioning method using the elastic chuck, the elastic chuck is generally more complicated in structure, and due to structural reasons, the chuck cannot be made larger, so it cannot meet the processing needs of large-diameter rings; the positioning method using the mandrel The method is generally suitable for ring-shaped workpieces with high height and small diameter. In addition, in all the above positioning methods, there is also a common defect of low clamping force.

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