CN-121988759-A - Machining method and clamping device for segmented annular workpiece

CN121988759ACN 121988759 ACN121988759 ACN 121988759ACN-121988759-A

Abstract

The application relates to the technical field of machining, and provides a machining method and a clamping device for a segmented annular workpiece, wherein the machining method comprises the following steps of S1, radially propping the segmented annular workpiece through a propping component of a first clamping device so as to finish the finish machining of the upper end face of the segmented annular workpiece; S2, axially compressing the segmented annular workpiece from the outer side through a first compressing assembly of the second clamping device to finish the finish machining of the outer circular surface of the segmented annular workpiece, S3, before compressing, placing a first copper gasket between a pressing plate of the second compressing assembly and the outer circular surface of the workpiece in a third clamping device, and plugging the second copper gasket into all segmented joints of the workpiece, and axially compressing the segmented annular workpiece from the outer side through a second compressing assembly of the third clamping device to finish the finish machining of the inner circular surface of the segmented annular workpiece. The three sets of clamping devices are sequentially used and designed in a targeted process, so that the segmented annular ring processing with high precision, high efficiency and high integrity is realized.

Inventors

SHI TIANXIANG
BAI JUNFENG
JIA MINGHAO
Tong Shengyang
ZHU LIN
WANG WEI
SHA LONG
ZHANG HONGWEI
LIU YUECHEN
ZHOU YU
JIN XING
HAO CHUNNA
ZHOU SHUNXIN
GUAN XIN
ZHU GUANHUA
LIU BAINING
LIU JIAHUI
GE KUN

Assignees

沈阳透平机械股份有限公司
沈鼓集团股份有限公司

Dates

Publication Date: 20260508
Application Date: 20260209

Claims (10)

1. The processing method of the segmented annular workpiece is characterized in that the segmented annular workpiece is a plurality of arc-shaped pieces formed by dividing a complete annular ring along the circumferential direction, and the arc-shaped pieces can be reconstructed into a complete annular ring after being spliced, and the processing method of the segmented annular workpiece comprises the following steps: S1, machining an upper end face, namely clamping the segmented annular workpiece in a first clamping device, and radially propping the segmented annular workpiece through a propping assembly of the first clamping device to finish the finish machining of the upper end face of the segmented annular workpiece; S2, machining an outer circular surface, namely transferring the workpiece machined in the S1 into a second clamping device, and axially pressing the segmented annular workpiece from the outer side through a first pressing component of the second clamping device so as to finish the outer circular surface finish machining of the segmented annular workpiece; S3, machining the inner circular surface, namely transferring the workpiece machined by the S2 into a third clamping device, placing a first copper gasket between a pressing plate of a second pressing component and the outer circular surface of the workpiece in the third clamping device before pressing, and plugging the second copper gasket into all the sectional joints of the workpiece, and axially pressing the sectional circular workpiece from the outer side through the second pressing component of the third clamping device to finish the finish machining of the inner circular surface of the sectional circular workpiece.
2. The method of machining a segmented annular workpiece according to claim 1, wherein the deformation of the segmented annular workpiece during machining is compensated and reduced by controlling the machining path and cutting parameters when turning is performed in step S2 or step S3.
3. The method of claim 1, wherein in step S3, the thickness of the second copper pad inserted into the segment joint is the same as the size of the segment joint.
4. The method for machining a segmented annular workpiece according to claim 1, wherein the segmented annular workpiece is reserved with machining allowance on the peripheral surfaces thereof before machining.
5. The method for machining the segmented annular workpiece according to claim 1, wherein the first copper gasket and the second copper gasket are annealed red copper gaskets, and the thickness range of the first copper gasket and the second copper gasket is 1 mm-3 mm.
6. A clamping device for a segmented annular workpiece, for realizing the method for processing a segmented annular workpiece according to any one of claims 1 to 5, comprising: The first clamping device is used for clamping the segmented annular workpiece to process the upper end face of the segmented annular workpiece and comprises a first base body and a jacking assembly, wherein the jacking assembly comprises a first screw and a jackscrew seat, and the jackscrew seat is driven by the first screw to radially jack the segmented annular workpiece; The second clamping device is used for clamping the segmented annular workpiece to process the outer circular surface of the segmented annular workpiece and comprises a second base body and a first compression assembly, wherein the first compression assembly comprises a second screw and a pressing block, and the second screw is matched with the pressing block to axially compress the segmented annular workpiece from the outer side; The third clamping device is used for clamping the segmented annular workpiece so as to machine the inner circular surface of the segmented annular workpiece, the third clamping device comprises a third base body and a second pressing assembly, the second pressing assembly comprises a third screw and a pressing plate, and the third screw is matched with the pressing plate so as to axially press the segmented annular workpiece from the outer side.
7. The clamping device for a segmented annular workpiece according to claim 6, wherein in the third clamping device, the first copper shim is disposed between the press plate and a finish surface of the segmented annular workpiece.
8. The clamping device for a segmented annular workpiece according to claim 6, further comprising a second copper shim for being inserted into a segmented seam of the segmented annular workpiece.
9. The clamping device for a segmented annular workpiece according to claim 6, wherein the second copper shim has a plurality of gauge thicknesses to accommodate different segment joint sizes.
10. The clamping device for a segmented annular workpiece according to claim 6, wherein the hardness of the pressing surfaces of the jackscrew seat, the pressing block and the pressing plate is lower than the surface hardness of the segmented annular workpiece.

Description

Machining method and clamping device for segmented annular workpiece Technical Field The application relates to the technical field of machining, in particular to a machining method and a clamping device for a segmented annular workpiece. Background Currently, large annular workpieces such as a clamping ring, a shear ring and the like for compressors are usually designed into a segmented and split structure for processing and assembling when the workpieces are limited by the structure. The finish machining of the workpiece faces serious challenges, and the traditional clamping mode such as a three-jaw chuck, a four-jaw chuck and the like is difficult to realize stable positioning and accurate circle center alignment when clamping the segmented arc piece. In the processing process, the workpiece is extremely easy to deviate and shake, so that the problems of low processing precision, low processing efficiency, large deformation of the workpiece and the like caused by non-concentricity are caused, and the final quality and performance of the product are seriously influenced. In addition, the prior art tries to use a split claw tool to clamp or optimize a turning process and other means respectively, but the prior art often has the defects of complicated operation flow, high tool manufacturing cost, poor practicality and the like, and is difficult to apply in large scale in actual production. Meanwhile, size control of the sectional joint and indentation protection of the finish machining surface in the clamping process are key problems which are often ignored in the existing method and influence the quality of the workpiece. Therefore, a special method and device for stably clamping, automatically aligning and efficiently processing the segmented annular workpiece and effectively protecting the surface of the workpiece are needed in the prior art so as to break through the technical bottleneck restricting the development of the heavy machinery manufacturing industry. Disclosure of Invention The application aims to at least solve the problem that in the related art, the traditional clamping mode has obvious limitation when being applied to a segmented annular workpiece. Because the ring is divided into multiple pieces before finish machining, the workpiece is easy to deviate or shake in the clamping process of the clamping jaw, and the technical problems of low machining precision, low machining efficiency, large workpiece deformation and the like caused by the non-concentricity of the workpiece are caused. In order to solve the technical problems, the application is realized as follows: The application provides a processing method of a segmented annular workpiece, which comprises the following steps of S1, processing an upper end surface, namely clamping the segmented annular workpiece in a first clamping device, radially propping the segmented annular workpiece through a propping component of the first clamping device to finish the finish processing of the upper end surface of the segmented annular workpiece, S2, processing the outer end surface, namely transferring the workpiece processed in the S1 into a second clamping device, axially compacting the segmented annular workpiece from the outer side through a first compacting component of the second clamping device to finish the finish processing of the outer end surface of the segmented annular workpiece, S3, processing the inner end surface, namely transferring the workpiece processed in the S2 into a third clamping device, placing a first copper segment gasket between a pressing plate of the second compacting component and the outer end surface of the workpiece, and pressing all the segmented annular workpiece from the outer side through a second compacting component of the second clamping device, and finishing the finish processing of the segmented annular workpiece from the outer side. The application provides a processing method of a segmented annular workpiece, which realizes the segmented annular processing with high precision, high efficiency and high integrity through the sequential use and the targeted process design of three sets of special clamping devices. Under the scene of stable clamping and upper end face finish machining, the first clamping device adopts a screw driving jackscrew seat mode to rigidly jack the segmented annular workpiece from the radial direction, so that the degree of freedom of the workpiece in the vertical direction is effectively restrained, the stability of a subsequent machining reference and the coaxiality requirement of the workpiece are ensured, and a solid foundation is laid for subsequent precision machining. Under the finish machining scene of the outer circular surface, the second clamping device adopts a mode of matching the screw with the pressing block to carry out axial compression from the outer side of the workpiece, the compression mode avoids the machined or to-be-machined surface, and the position prec