CN-122007934-A - Machining clamp and machining method for guide inner support

CN122007934ACN 122007934 ACN122007934 ACN 122007934ACN-122007934-A

Abstract

The invention provides a processing method of an inner guide support, which comprises the steps of firstly processing a large end face, then processing an inner hole of a part and an outer circle of the part, finally processing a small end face and removing the allowance of the inner hole of the part when the large end face is processed in a rough mode, taking the small end face as a rough positioning reference when the large end face is processed in a rough mode, taking the large end face of the part as a rough positioning reference when the inner hole of the part and the outer circle of the part are processed in a rough mode, and taking the back face of a large installation edge as a supporting face when the allowance of the inner hole of the part is removed in a rough mode. Further, an electric spark machining clamp is arranged, the machining state of the electrode is changed, and the inclined machining in the prior art is changed into vertical machining. And through the improvement of the processing procedure, the parallelism of the reverse surface of the mounting edge relative to the I datum plane is changed from the indirect guarantee of the original procedure to the direct guarantee. The invention improves the qualification rate of parallelism and the product quality, and meanwhile, the improvement scheme of the invention has no new working procedures, does not influence the processing flow, and effectively controls the processing time.

Inventors

XIAO WEIHONG
ZOU JILIANG
LV ZHENG
PENG XING
LUO GUANGJIONG

Assignees

中国航发南方工业有限公司

Dates

Publication Date: 20260512
Application Date: 20260109

Claims (10)

1. A processing clamp for an inner guide support is characterized by comprising a bottom plate, a vertical plate, a shaft, a positioning plate, a pressing plate and a guide sleeve, wherein the bottom plate is used for being installed on an electric spark high-speed punching machine, the bottom plate comprises a mounting surface and a supporting surface, the mounting surface is fixed with the electric spark high-speed punching machine, the supporting surface forms an angle alpha with the mounting surface, the inclination angle alpha of a workpiece installed on the clamp is equal to the inclination angle of a relatively small end face of a gas film hole, the vertical plate is vertically fixed on the supporting surface, the shaft penetrates through the vertical plate to be movably connected with the vertical plate, one end of the shaft is fixedly provided with the positioning plate, the pressing plate is arranged on the positioning plate, the workpiece is fixedly pressed through the pressing plate and the positioning plate, one side of the positioning plate is fixedly provided with the guide sleeve with a guide hole, the guide hole and the center line of the gas film hole are in the same line during punching, and a processing electrode is arranged in the guide sleeve to process the gas film hole.
2. The fixture for machining an inner guide support according to claim 1, further comprising a pin, wherein the vertical plate is provided with pin holes matched with the pin, the positioning plate is provided with positioning holes, the number of the positioning holes is equal to that of the air film holes, the size of the positioning holes is equal to that of the pin holes, and when the workpiece is mounted on the positioning plate, the pin holes, the positioning holes and the air film holes are aligned, and the pin penetrates through the pin holes into the positioning holes.
3. The processing fixture of an inner guide support according to claim 2, wherein the guide sleeve is mounted on the vertical plate through a mounting seat, the guide sleeve is L-shaped, one end of the L-shaped guide sleeve is provided with the guide hole, the other end of the L-shaped guide sleeve is fixed with the mounting seat, the guide sleeve is rotationally connected with the mounting seat, and when a workpiece is mounted, the guide sleeve is rotated so that the guide sleeve does not interfere with the workpiece.
4. The processing clamp for the guide inner support according to claim 3, wherein the mounting seat comprises a seat body and a rotating plate, the seat body is fixed with the vertical plate, a positioning groove is formed in the seat body, one ends of the rotating plate and the guide sleeve can be placed in the positioning groove, the widths of the positioning groove, the rotating plate and the guide sleeve are equal, the guide sleeve is movably mounted in the positioning groove, the width of the guide sleeve is larger than the thickness of the guide sleeve, one end of the guide sleeve can rotate in the positioning groove, when one ends of the rotating plate and the guide sleeve are placed in the positioning groove, one ends of the rotating plate and the guide sleeve are in contact with the guide sleeve, and the rotating plate is movably mounted in the positioning groove, so that the rotating plate can rotate out of the positioning groove, and the limitation of the rotation of the guide sleeve is relieved.
5. The processing fixture for an inner guide support according to claim 4, wherein a limiting structure is arranged at one end of the shaft, which is not fixed with the turntable, and comprises a bushing, a gasket and a nut which are sequentially arranged in the axial direction of the shaft, wherein the vertical plate is sleeved on the bushing, the bushing and the vertical plate are fixed through a fastener, and the gasket, the bushing, the vertical plate and the positioning disk are tightly pressed by tightening the nut.
6. The tooling fixture of an inner bearing of claim 5 further comprising an angular pin perpendicular to the positioning plate, the angular pin passing through a connecting hole in a small end surface of the inner bearing to limit the position of the part relative to the positioning plate.
7. A processing method of an inner guide support is characterized in that an outer circle of the inner guide support is of a stepped structure and sequentially comprises a large installation edge, an outer circle I, an outer circle II and a small installation edge, two end face grooves are formed in the outer circle I close to the large installation edge, gas film holes are uniformly distributed in the outer circle II close to the small installation edge and used for gas in a guider to pass through, and the processing method is characterized in that when the gas film holes are processed through electric spark, the clamp in any one of claims 1-6 is used for inclining a part, enabling the gas film holes to be perpendicular to a processing plane, and reducing the diameter of an electrode guide sleeve.
8. The method according to claim 7, wherein the large end face is machined, the inner hole of the part and the outer circle of the part are machined, the small end face is machined and the allowance of the inner hole of the part is removed, the small end face is used as a rough positioning reference when the large end face is machined, the large end face of the part is used as a rough positioning reference when the inner hole of the part and the outer circle of the part are machined, and the small end face of the part is machined and the back face of the inner hole of the part is used as a supporting surface when the allowance of the inner hole of the part is removed.
9. The method of claim 8, wherein the first outer circle, the first large mounting edge and the second outer circle are finished by coloring the large end face and pressing the small end face, and the small end face is used as the bearing surface to finish the first outer side of the large mounting edge, the radial side of the large mounting edge, the reverse side of the large mounting edge and the first outer circle to the designed size.
10. The method of claim 9, wherein the large end face is supported on the entire surface during the end face groove machining.

Description

Machining clamp and machining method for guide inner support Technical Field The invention relates to the technical field of machining, in particular to a machining clamp and a machining method for a guide inner support. Background The guide inner support is a part of a turbine part of the engine, the guide refers to a first-stage guide of the gas turbine, the guide inner support is a support part in the first-stage guide, the guide inner support is a ring part, the material is a superalloy, one end of the guide inner support is provided with a large mounting edge with a larger diameter, the other end of the guide inner support is provided with a small mounting edge with a smaller diameter, and the small mounting edge and other parts are fixed and matched with a rotor part to play a sealing role. The side of the large installation side facing the small installation side is called the large installation side reverse side, the large installation side reverse side is matched with the inner hole end face of the primary guide of the gas turbine, the parallelism requirement is arranged between the large installation side reverse side and the end face of the small installation side, as shown in fig. 1, a partial diagram of a guide inner support is shown, and the I reference is the end face of the small installation side. The outer circle of the guide inner support is of a stepped structure, and is sequentially provided with a large mounting edge 1, an outer circle 2, a small mounting edge 4, wherein the stepped structure is further arranged between the outer circle 2 and the outer circle 3, and the outer diameters of the large mounting edge 1, the outer circle 2, the outer circle 3 and the small mounting edge 4 are gradually reduced. Two end face grooves are formed in the first outer circle 2 close to the large mounting edge 1, and air film holes 5 are uniformly distributed in the second outer circle 3 close to the small mounting edge 4 and used for allowing gas in the guide to pass through. The large mounting edge 1 is also stepped, with the smaller outer diameter portion being located on the outside. From the above, a guide support is generally a structure with a thick end and a thin end, and a blank of the guide support is a structure with a larger end and a smaller end. The large end refers to the end face of a large workpiece when the workpiece is not processed and formed into a product, the large end face refers to the end face of the large end, the small end refers to the end face of a small workpiece when the workpiece is not processed and formed into a product, and the small end face refers to the end face of the small end. In the process of machining the inner guide support, the technical personnel find that the existing machining method of the inner guide support has the following technical problems: 1. when the rough machining of the part is performed, a small end face at the other end is machined by taking the large end face as a supporting face, and then the large end face, the outer circle and the inner hole are machined by taking the small end face as a supporting face, as shown in fig. 1, the machining allowance of the large end face is L1 (for example, L1=9.3 mm), the minimum wall thickness of the supporting part is L2 (for example, L2=3.45 mm), and during the cutting process, axial cutting force continuously acts on the workpiece, so that the small end face serving as the supporting face deforms, and the axial dimension is difficult to ensure. If the rough machining size of the part is unqualified, the part is clamped again and repaired, so that great waste of manpower and material resources can be caused, and the production progress is influenced. 2. And air film holes are uniformly distributed on the second outer circle close to the small mounting edge, the air film holes are inclined holes inclined at an angle of 75 degrees and 29 'relative to the axial direction of the workpiece, electric spark machining is adopted, the diameter of a machining electrode is phi 1.2, and a machining mode adopts a spindle deflection angle of 14 degrees and 31'. The pore diameter is out of tolerance, and the pore is conical after being measured by a core rod, wherein the out of tolerance is caused by that only one group of parameters are used for processing in the electric spark processing process, and the allowance integrity of the pore at the inlet and the outlet of the air film pore is not considered, so that the processing quality is unstable. For example, the patent application with publication number of CN116372288A, named as a radial air film hole processing device, is provided with a plurality of processing modules, the processing modules can move and stretch along a plurality of degrees of freedom in the inner space of a part to be processed, and the invention can process a plurality of or a group of radial air film holes at one time by utilizing an electric spark forming process, thereby improving the