Flexible clamp for tightly supporting inner circle of workpiece

Abstract

The invention provides a flexible clamp for tightly supporting an inner circle of a workpiece. The flexible clamp is characterized in that a large taper shank shaft is arranged in a taper hole of a lathe spindle and tensioned through a screw; the large taper shank shaft and an elastic clamp are assembled together; the elastic clamp is in a disc shape and provided with three straight grooves evenlydistributed in the radial direction; the elastic clamp is in interference fit with a cast aluminum alloy workpiece; rivets are arranged between the adjacent straight grooves of the elastic clamp; three clamping jaws correspond to the three rivets in position; the lathe spindle is connected to a three-jaw chuck; the three clamping jaws can shrink and expand in the radial direction at the same time; when the three clamping jaws shrink and press rivet heads at the same time, the elastic clamp shrinks, the outer circle of the elastic clamp shrinks, and after the cast aluminum alloy workpiece is arranged, the three clamping jaws are loosened, the elastic clamp rebounds outwards, and the inner circle of the cast aluminum alloy workpiece is tightly supported. The flexible clamp can adapt to thesize change of the workpiece, a positioning outer circle of the clamp is completely sealed with the inner circle of the workpiece, the positioning precision is high, and additional clamping elements are not needed.

Description

technical field [0001] The invention relates to a flexible clamp for tightening the inner circle of a workpiece, which belongs to the technical field of machine tool clamps. Background technique [0002] Batch processing of cast aluminum alloy parts, the inner circle size of the parts is Φ400H9, the inner circle has been processed, waiting for the outer circle contour and right end face to be turned, and the coaxiality requirements of the Φ400H9 inner circle and the large outer circle are guaranteed. [0003] The traditional clamping scheme one is: [0004] Because the inner hole of the workpiece is large, it is clamped with a three-jaw chuck of a medium-sized lathe to tighten the inner circle of the workpiece, such as figure 1 As shown, the three jaws of the three-jaw chuck are inserted into the inner hole of the workpiece, and the inner circle of the workpiece is tightened by the radial expansion force of the long jaws. Because the three jaws of the three-jaw chuck are u...

AI Technical Summary

Problems solved by technology

[0010] (1) In the traditional clamping scheme 1, the arc of the jaws of the three-jaw chuck cannot completely fit the inner circle of the workpiece, the contact area is small, the positioning accuracy is poor, the firmness of the radial tension is also poor, and the scrap rate is high

[0011] (2) In the second traditional clamping scheme, there is a defect that the fit gap between the outer circle of the mandrel and the inner hole of the workpiece is large, and there is a defect of poor positioning accuracy, and the right end surface of the workpiece cannot be processed

[0012] (3) When the shape and size of the workpiece have a certain change, the rigid fixture cannot adapt to this change. The change in the inner circle size of the above workpiece is only 0.14mm. The rigid mandrel fixture cannot adapt to this change, and there are waste products.

Images