CN-121988764-A - Inner cavity turning clamping device for long overhanging thin-wall cylindrical part

CN121988764ACN 121988764 ACN121988764 ACN 121988764ACN-121988764-A

Abstract

The invention provides a long overhanging thin-wall cylindrical part inner cavity turning clamping device, which drives a plurality of inclined plane cone parts to synchronously move through a driving turntable structure, so that a plurality of clamping structures are driven to synchronously clamp or loosen the long overhanging thin-wall cylindrical part, the long overhanging thin-wall cylindrical part inner cavity turning clamping device is beneficial to reducing workpiece deformation in the clamping process, is simple to operate, is provided with a plurality of clamping structures, and is distributed along the circumferential direction of a supporting cylinder, each clamping structure is provided with a first clamping part and a second clamping part, and the long overhanging thin-wall cylindrical part can be clamped at different axial positions through the first clamping part and the second clamping part, and thus the integral rigidity of the long overhanging thin-wall cylindrical part can be effectively improved by utilizing simultaneous linkage clamping of multi-point support and two cross-section circles, so that the sufficient structural strength is ensured in the inner contour machining process, and the requirements of higher surface quality and dimensional accuracy are met.

Inventors

LI CHAO
DING ZHICHUN
ZHOU LIFENG
CHEN YUJIE
MA CHI

Assignees

中国航发商用航空发动机有限责任公司

Dates

Publication Date: 20260508
Application Date: 20241105

Claims (11)

1. The long overhanging thin-wall cylindrical part inner cavity turning clamping device is characterized by being used for clamping the long overhanging thin-wall cylindrical part to carry out inner cavity turning processing, and comprises the following components: The support piece comprises a support cylinder and a base mounted at one axial end of the support cylinder; The clamping structure comprises a connecting support, an upper pressing rod and a lower pressing rod, wherein the connecting support is fixedly connected to the supporting cylinder, the upper pressing rod is rotatably connected with the connecting support, the upper pressing rod is provided with a first rod section and a second rod section which are positioned at two sides of the connecting support, the first rod section is provided with a first clamping part, one end of the lower pressing rod is rotatably connected to a part between the first rod section and the second rod section, and the lower pressing rod is provided with a second clamping part; The driving structure comprises a driving turntable structure and a plurality of hinge pressing rod structures, wherein the hinge pressing rod structures are arranged on the base, the hinge pressing rod structure is provided with an inclined plane cone piece, the inclined plane cone piece is arranged between the lower pressing rod and the second rod section, the hinge pressing rod structures are all in transmission connection with the driving turntable structure, and the driving turntable structure is used for driving the inclined plane cone pieces of the hinge pressing rod structures to synchronously move along the axial direction of the supporting cylinder so as to open or close the lower pressing rod and the second rod section; When the lower pressure rod and the second rod section are opened relatively, the first clamping part and the second clamping part synchronously move in the direction away from the supporting cylinder so as to be clamped at different axial positions of the outer peripheral surface of the long overhanging thin-wall cylindrical part; when the pressing rod and the second rod section are closed, the first clamping part and the second clamping part synchronously move towards the direction close to the supporting cylinder so as to loosen the long overhanging thin-wall cylindrical part.
2. The long overhanging thin-walled cylinder inner cavity turning clamping device according to claim 1, characterized in that, The hinge pressing rod structure further comprises a shifting fork and a hinge structure, wherein the shifting fork comprises a first shifting fork arm, a second shifting fork arm and a third shifting fork arm which are connected with each other, the first shifting fork arm is rotationally connected with the base, the second shifting fork arm is in sliding fit with the first moon tooth groove, one end of the hinge structure is rotationally connected with the third shifting fork arm, the other end of the hinge structure is rotationally connected with the inclined cone piece, and the hinge structure is used for converting the movement of the third shifting fork arm on the end face of the base into the movement of the inclined cone piece along the axial direction of the supporting cylinder.
3. The long overhanging thin-walled cylinder inner cavity turning clamping device according to claim 2, characterized in that, The hinge structure comprises a first hinge rod, a second hinge rod and a third hinge rod, one end of the first hinge rod, one end of the second hinge rod and one end of the third hinge rod are rotatably connected, the other end of the first hinge rod is rotatably connected with the third shifting fork arm, and the other end of the second hinge rod is rotatably connected with the inclined cone piece; The base is fixedly connected with a hinge mounting seat, one end of the hinge mounting seat along the axial direction of the supporting cylinder is fixedly connected with the base, the other end of the hinge mounting seat along the axial direction of the supporting cylinder is rotatably connected with the other end of the third hinge rod, and the first hinge rod is converted into the second hinge rod along the axial direction of the supporting cylinder under the condition that the shifting fork rotates.
4. The long overhanging thin-wall cylinder inner cavity turning clamping device according to claim 3, characterized in that, The hinge structure further comprises a fourth hinge rod, the second hinge rod is rotatably connected with the inclined plane cone piece through the fourth hinge rod, the support cylinder is further provided with a bearing frame, the bearing frame is provided with a through hole penetrating through the bearing frame along the axial direction of the support cylinder, the fourth hinge rod penetrates through the through hole and is slidably matched with the through hole, and the second hinge rod and the inclined plane cone piece are respectively located on two sides of the bearing frame.
5. The long overhanging thin-wall cylinder inner cavity turning clamping device according to claim 3, characterized in that, The support cylinder is provided with a through groove, the through groove penetrates through the support cylinder along the radial direction of the support cylinder, the shifting fork is arranged on the outer side of the support cylinder, the second hinge rod and the third hinge rod are located on the inner side of the support cylinder, the first hinge rod movably penetrates through the through groove, and the through groove is in the axial direction of the support cylinder and provides a movable space for the first hinge rod.
6. The long overhanging thin-walled cylinder inner cavity turning clamping device according to claim 2, characterized in that, The first shifting fork arm comprises a first arm part and a second arm part, the first arm part is fixedly connected with the second shifting fork arm and the third shifting fork arm, the second arm part is rotatably connected with the first arm part, and the second arm part is provided with a first rotating shaft which is rotatably connected with the base.
7. The long overhanging thin-walled cylinder inner cavity turning clamping device according to claim 1, characterized in that, The driving turntable structure comprises a cam turntable and an axial supporting plate, the axial supporting plate is fixedly connected to one side of the base, which is away from the supporting cylinder, and the cam turntable is rotatably arranged on the axial supporting plate and provides axial support for the cam turntable through the axial supporting plate; The hinge pressing rod structure comprises a first movable shaft, a first crescent tooth groove is formed in a base, a second crescent tooth groove is formed in an axial supporting plate, the hinge pressing rod structure comprises a first movable shaft, the first movable shaft is in movable fit with the first crescent tooth groove, one end of the first movable shaft extends to one side, away from the supporting cylinder, of the base, the driving turntable structure further comprises a steering fork, the steering fork is located on one side, away from the supporting cylinder, of the base, one end of the steering fork is rotatably connected with the base, the other end of the steering fork is used for being matched with the first movable shaft to push the first movable shaft to move along the first crescent tooth groove, the steering fork is provided with a second movable shaft, the second movable shaft penetrates through the second crescent tooth groove to be matched with a cam portion of the cam turntable, and accordingly the steering fork moves along a molded line of the cam portion under the condition that the cam turntable rotates.
8. The long overhanging thin-walled cylinder inner cavity turning clamping device as claimed in claim 7, characterized in that, The driving turntable structure further comprises a driving piece, the driving piece comprises a rack section and a worm gear pair, the rack section is fixedly connected with the cam turntable, the worm gear pair is meshed with the rack section, and the worm gear pair is used for driving the cam turntable to rotate in a preset angle range through the rack section.
9. The long overhanging thin-walled cylinder inner cavity turning clamping device as claimed in claim 8, characterized in that, The cam turntable is also provided with a balancing block, and the balancing block and the turbine worm pair are oppositely positioned at two radial sides of the cam turntable.
10. The long overhanging thin-walled cylinder inner cavity turning clamping device as claimed in claim 7, characterized in that, One side of the base, which is away from the supporting cylinder, is also provided with a connecting lug, and one end of the connecting lug, which is far away from the base, is fixedly connected with the axial supporting plate, so that the axial supporting plate is fixedly connected with the base, and a movable space of the steering fork is formed between the base and the axial supporting plate.
11. The long overhanging thin-walled cylinder inner cavity turning clamping device according to claim 1, characterized in that, The first clamping part comprises a first fan-shaped supporting plate rotatably connected with the first rod section, the first fan-shaped supporting plate is provided with a concave surface used for matching with the outer peripheral surface of the long overhanging thin-walled cylindrical member, and/or, The second clamping part comprises a second fan-shaped supporting plate rotatably connected with the pressing rod, and the second fan-shaped supporting plate is provided with a concave surface matched with the outer peripheral surface of the long overhanging thin-wall cylindrical part.

Description

Inner cavity turning clamping device for long overhanging thin-wall cylindrical part Technical Field The invention relates to the technical field of cylindrical part machining clamps, in particular to a turning clamping device for an inner cavity of a long overhanging thin-wall cylindrical part. Background The drum shaft of the aeroengine belongs to a long overhanging thin-wall type cylinder part, is connected with a first-stage high-pressure turbine disc and a high-pressure drum, and is an important part for reliable operation under extremely complex environments of high temperature, high pressure and high rotating speed. The parts are made of powder metallurgy high-temperature alloy materials, and have extremely high technical requirements and surface quality requirements. Because of the typical long overhanging thin-wall cylindrical characteristic, the problems of poor overall rigidity, large cutting resistance and high cutting temperature of the cutter during internal contour machining exist, and meanwhile, the cutter point and the surface of a workpiece are trembled to influence the machining precision. At present, in the processing process of the inner contour of an isometric overhanging thin-wall cylindrical part such as an aeroengine drum shaft, in order to enhance the integral structural rigidity of a workpiece, a cylindrical supporting ring is additionally arranged on the outer contour of the workpiece, and the workpiece is held tightly in an independent radial adjustment mode by oppositely arranging four adjustable bolts on the cylindrical supporting ring body, so that the structural rigidity in the processing process of the long overhanging thin-wall cylindrical part is enhanced. The radial bolts are required to be adjusted one by one in the clamping process of the device, the workpiece is held tightly, the clamping process is complex in operation, the adjustment of the parts is difficult, uneven stress of the adjusting bolts is easy to cause, the workpiece is deformed, the repeatability of the mode is poor, and the clamping efficiency is low in batch processing. Disclosure of Invention The invention aims to provide a long overhanging thin-wall cylindrical part inner cavity turning clamping device, which can solve the technical problems that in the prior art, the weak rigidity of the long overhanging thin-wall cylindrical part is very easy to cause tremble of a cutter point and the surface of a workpiece in the machining process to influence the machining precision, and the workpiece is easy to elastically deform after machining. Embodiments of the present invention may be implemented by: The long overhanging thin-wall cylindrical part inner cavity turning clamping device is used for clamping the long overhanging thin-wall cylindrical part to carry out inner cavity turning, and comprises: The support piece comprises a support cylinder and a base mounted at one axial end of the support cylinder; The clamping structure comprises a connecting support, an upper pressing rod and a lower pressing rod, wherein the connecting support is fixedly connected to the supporting cylinder, the upper pressing rod is rotatably connected with the connecting support, the upper pressing rod is provided with a first rod section and a second rod section which are positioned at two sides of the connecting support, the first rod section is provided with a first clamping part, one end of the lower pressing rod is rotatably connected to a part between the first rod section and the second rod section, and the lower pressing rod is provided with a second clamping part; The driving structure comprises a driving turntable structure and a plurality of hinge pressing rod structures, wherein the hinge pressing rod structures are arranged on the base, the hinge pressing rod structure is provided with an inclined plane cone piece, the inclined plane cone piece is arranged between the lower pressing rod and the second rod section, the hinge pressing rod structures are all in transmission connection with the driving turntable structure, and the driving turntable structure is used for driving the inclined plane cone pieces of the hinge pressing rod structures to synchronously move along the axial direction of the supporting cylinder so as to open or close the lower pressing rod and the second rod section; When the lower pressure rod and the second rod section are opened relatively, the first clamping part and the second clamping part synchronously move in the direction away from the supporting cylinder so as to be clamped at different axial positions of the outer peripheral surface of the long overhanging thin-wall cylindrical part; when the pressing rod and the second rod section are closed, the first clamping part and the second clamping part synchronously move towards the direction close to the supporting cylinder so as to loosen the long overhanging thin-wall cylindrical part. Optionally, the base is provided with a first crescen