positioning tensioner

Abstract

A positioning and expansion device is used for positioning workpieces such as pipes and sleeves. The positioning and expansion device comprises a positioning driving component, a guide rod, a positioning block, an expansion driving component, a push rod and an expansion portion, wherein the expansion driving component is connected with the positioning driving component, the positioning block is connected with the expansion driving component through the guide rod, the push rod penetrates through the guide rod and is connected with the expansion driving component and the expansion portion, part of the expansion portion protrudes out of the positioning block in the axial direction of the expansion driving component, the positioning driving component can drive the expansion driving component and the positioning block to advance so that the positioning block can abut against the end face of a workpiece and part of the expansion portion can stretch into an inner hole of the workpiece, and the expansion portion can be pushed by the expansion driving component and the push rod to move in the radial direction of the inner hole of the workpiece so as to abut against the workpiece. According to the positioning expansion device, axial positioning and radial expansion are integrated, the coaxiality accuracy of the inner hole in the two ends of the workpieces can be improved, and automatic production is facilitated.

Description

technical field [0001] The invention relates to the field of machining, in particular to a positioning and tightening device for pipe and sleeve parts. Background technique [0002] Pipe and sleeve workpieces in machinery, such as various bearing sleeves, gears and pulleys, are widely used parts in production. The main processing surfaces of tubes and sleeves are inner holes, outer circles and end faces. Pipe and sleeve workpieces are usually positioned by the inner hole and then processed on the outer circle and the end face. [0003] An existing positioning method for pipe and sleeve workpieces is to set a positioning pin at both ends of the workpiece to be positioned, and to ensure the inner holes at both ends of the workpiece through clearance fit between the positioning pin and the inner holes at both ends of the workpiece. Concentricity. However, due to the low positioning accuracy of clearance fit, it affects the positioning accuracy of the positioning pin shaft an...

AI Technical Summary

Problems solved by technology

However, due to the low positioning accuracy of clearance fit, it affects the positioning accuracy of the positioning pin shaft and the inner hole of the workpiece, and, as the use time increases, the positioning pin shaft will continue to wear and gradually increase the distance between the positioning pin shaft and the inner hole of the workpiece. The matching clearance, which leads to the continuous decline of the coaxiality between the inner holes at both ends of the workpiece

In addition, this positioning method requires manual operation and is not easy to automate, which greatly reduces production efficiency

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