Clamp for finish-turning inner and outer circles of open circular ring work piece and finish-turning method by the use of clamp

Abstract

The invention discloses a clamp for finish-turning inner and outer circles of an open circular ring work piece. The clamp comprises a clamp body, an inner pressing ring and an outer pressing ring. The end surface, opposite to a rotating shaft, of the clamp body is provided with a first positioning end surface vertical to the axis of the rotating shaft. The inner pressing ring is fixed to the end surface, opposite to the rotating shaft, of the clamp body, is concentric with the rotating shaft, and comprises an inner hole positioning segment and a first end surface positioning segment. The first end surface positioning segment is provided with a second positioning end surface vertical to the axis of the inner pressing ring. The outer circle of the inner hole positioning segment is concentric with the inner pressing ring, and matches an inner hole of a compressed blank. The outer pressing ring comprises an outer circle positioning segment and a second end surface positioning segment. The second end surface positioning segment is provided with a third positioning end surface vertical to the axis of the outer pressing ring. An inner hole of the outer circle positioning segment is concentric with the outer pressing ring, and matches the outer circle of the compressed blank which is finish-turned. According to the invention, the verticality between the inner and outer circles and the end surfaces, the size precision of the inner and outer circles, and the form and location tolerance can be guaranteed. The invention also discloses a finish-turning method by the use of the clamp, and another clamp for finish-turning the inner and outer rings of the open circular ring work piece.

Description

technical field [0001] The invention relates to a jig for the inner and outer circles of an open ring workpiece and a method thereof, in particular to a jig for the inner and outer circles of an open ring workpiece and a method for finishing it. Background technique [0002] The thin-walled open ring workpiece is a kind of inclined-plane lap joint seal ring used in steam turbines. The seal ring belongs to the rotary structure, and there is a gap in the circumferential direction. The opening cutting surface is a bevel lap joint structure, such as figure 1 and figure 2 . The wall of the sealing ring is thin, the thinnest wall thickness is about 4.5mm, the outer circle is arranged with a stepped circle, and the verticality between the end surface and the inner and outer circles is required to be 0.01mm. The opening distance of the sealing ring is relatively large. During processing, the opening needs to be compressed to a predetermined size, so that the dimensional accuracy ...

AI Technical Summary

Problems solved by technology

[0003] However, since the above-mentioned thin-walled open ring workpieces, such as the above-mentioned sealing ring, are typical thin-walled parts, the processing deformation is large, the clamping is inconvenient, and the requirements for dimensional accuracy and shape and position tolerance are relatively high. The main difficulties in processing are: first, The sealing ring is a typical thin-walled part with poor rigidity, and it is difficult to control the machining deformation; second, the sealing ring cannot be directly clamped when turning the part, and a special turning fixture needs to be designed; third, the inner and outer circles of the sealing ring The size needs to be guaranteed in the compressed state. How to ensure the stability of the gap between the lapping slopes during the turning process is a certain degree of difficulty; Fourth, due to the special structure of the sealing ring, it is necessary to ensure that the inner and outer circles are processed in the same reference state to ensure the dimensions of the inner and outer circles and Geometric Tolerance

[0004] Apparently, not only the processing of the above-mentioned bevel lap joint seal ring of the steam turbine will face at least the above-mentioned problems, but also the thin-walled open ring workpieces of other machinery and equipment will also face the same problem

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