Inner supporting tool clamp suitable for machining outer wall face of thin-wall casing casting

Abstract

An inner supporting tool clamp suitable for machining the outer wall face of a thin-wall casing casting belongs to the technical field of aero-engine part manufacturing and comprises a base supporting assembly, an automatic centering assembly, a rigid supporting sliding block and a flexible supporting assembly. Automatic centering design is adopted, radial supporting force is provided for the inner wall face of the thin-wall casing casting in a flexible supporting mode, the workpiece deformation amount in the clamping process can be reduced, workpiece cutting vibration can be restrained in the machining process, and the workpiece machining precision is improved; the displacement sensor is arranged between the floating supporting top block and the rigid supporting sliding block, the tiny displacement amount of the floating supporting top block relative to the rigid supporting sliding block in the machining process can be measured and fed back to the machine tool machining amount compensation controller in real time, and a machine tool adjusts cutting amount parameters in real time in a dynamic compensation mode. The size parameters of the thin-wall casing casting are always in a set tolerance range, the workpiece machining precision is improved, and the size consistency and the product production quality of the thin-wall casing casting are guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of manufacturing parts of aviation engines, and in particular relates to an inner supporting fixture suitable for machining the outer wall surface of a thin-walled casing casting. Background Art

[0002] At present, the casing of aircraft engines is usually manufactured by thin-walled castings. Therefore, the initial accuracy of the outer wall of the manufactured thin-walled casing casting is poor. In order to ensure that the thin-walled casing casting can better meet the assembly accuracy requirements of the aircraft engine, the outer wall of the thin-walled casing casting needs to be fine-machined.

[0003] However, thin-walled casing castings have the characteristics of low rigidity, and they usually need to be processed through multiple processes and multiple clamping. Multiple clamping not only easily leads to the accumulation of processing errors, but also the use of traditional tooling fixtures is prone to cause large deformation of the workpiece during the clamping process, which further increases the processing error of the workpiece during the processing process, and ultimately results in low dimensional consistency and product production quality of thin-walled casing castings. Summary of the invention

[0004] In view of the problems existing in the prior art, the present invention provides an internal support fixture suitable for machining the outer wall surface of a thin-walled casing casting. The internal support fixture adopts an automatic centering design to provide a reliable and stable radial support force for the inner wall surface of the thin-walled casing casting in a flexible support manner, which can not only reduce the deformation of the workpiece during the clamping process, but also suppress the cutting vibration of the workpiece during the machining process, thereby effectively improving the machining accuracy of the workpiece; by arranging a displacement sensor between the floating support top block and the rigid support slider during the machining process, the small displacement of the floating support top block relative to the rigid support slider during the machining process can be measured, and then the small displacement can be fed back in real time to the machining amount compensation controller of the machine tool, and finally the machine tool adjusts the cutting amount parameters in real time in a dynamic compensation manner, so that the dimensional parameters of the thin-walled casing casting are always within the set tolerance range, thereby further improving the machining accuracy of the workpiece and effectively ensuring the dimensional consistency and product production quality of the thin-walled casing casting.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: an internal support fixture suitable for processing the outer wall surface of a thin-walled casing casting, comprising a base support assembly, an automatic centering assembly, a rigid support slider and a flexible support assembly; the automatic centering assembly is arranged above the base support assembly, the rigid support slider is arranged on the automatic centering assembly, and the flexible support assembly is arranged on the rigid support slider; a displacement sensor is arranged between the flexible support assembly and the rigid support slider; a communicator is installed in the base support assembly, a signal receiving end of the communicator is electrically connected to a signal output end of the displacement sensor, and a signal transmitting end of the communicator is electrically connected to a processing amount compensation controller of a machine tool.

[0006] The base support assembly includes a supporting base plate, a supporting platform, a supporting column and a supporting ring frame; the supporting platform is fixedly arranged above the supporting base plate, and the supporting platform and the supporting base plate are coaxially distributed; the communicator is fixedly arranged above the supporting platform; the supporting columns are vertically fixedly mounted on the circumferential side edge portion above the supporting platform, and there are a number of supporting columns, which are evenly distributed along the circumferential direction of the supporting platform; the supporting ring frame is fixedly arranged on the top of the supporting columns, and the supporting ring frame is coaxially distributed with the supporting base plate.

[0007] A plurality of transfer screw holes and transfer positioning grooves are arranged on the surface of the support base plate, and the support base plate is adapted and connected to the workbench of the machine tool through the transfer screw holes and the transfer positioning grooves.

[0008] The automatic centering assembly includes an active bevel gear, a driving shaft, a driven bevel gear, a rotating disk and a limiting disk; the driving shaft is horizontally installed on the supporting ring frame, the center of the supporting ring frame is located on the central axis of the driving shaft, and the driving shaft has only a degree of rotational freedom relative to the supporting ring frame; an inner hexagonal blind hole is provided at the center of the outer end surface of the driving shaft; the active bevel gear is located on the inner side of the supporting ring frame, and the active bevel gear is coaxially fixed to the inner end of the driving shaft; the driven bevel gear is located above the supporting ring frame, the driven bevel gear and the supporting ring frame are coaxially distributed, and the driven bevel gear is meshed with the active bevel gear; the rotating disk is located at the driven bevel gear Above the gear, the rotating disk is fixedly connected to the driven bevel gear and the two are coaxially distributed; the limiting disk is located above the rotating disk, the limiting disk is fixedly connected to the supporting ring frame, a centering slide rail is arranged on the limiting disk, and the center line of the centering slide rail is parallel to the radial direction of the supporting ring frame; a centering slider is arranged inside the centering slide rail, and the centering slider has only linear movement freedom relative to the centering slide rail; the rigid support slider is fixedly installed above the centering slider; a plane thread is fixedly arranged on the upper surface of the rotating disk, and a plane screw tooth is fixedly arranged on the lower surface of the centering slider, and the plane screw tooth is meshed with the plane thread.

[0009] The number of the driving shafts is three or four and they are evenly distributed along the circumferential direction of the supporting ring frame, and the inner end of each driving shaft is coaxially fixedly connected with a driving bevel gear.

[0010] The number of the centering slide rails is three to six and they are evenly distributed along the circumference of the limiting disk. A centering slider is arranged in each centering slide rail, and the distances between all the centering sliders and the center of the limiting disk are all equal.

[0011] The flexible support assembly includes a floating support top block, a floating support rod and a thrust spring; a support rod socket is provided on the outer facade of the centering slider; the thrust spring is located at the bottom of the support rod socket; one end of the floating support rod is inserted into the support rod socket and connected to the thrust spring, the other end of the floating support rod extends to the outside of the support rod socket and is fixedly connected to the floating support top block, and the floating support rod has axial freedom of movement relative to the support rod socket; the displacement sensor is arranged in the gap between the floating support top block and the outer facade of the centering slider, and the displacement sensor is respectively connected to the floating support top block and the centering slider.

[0012] There are two support rod sockets, which are symmetrically distributed left and right relative to the center line of the centering slider. A floating support rod is inserted in each support rod socket, and a thrust spring is arranged between each floating support rod and the bottom of the support rod socket.

[0013] Beneficial effects of the present invention: The inner support fixture suitable for machining the outer wall surface of a thin-walled casing casting of the present invention adopts an automatic centering design, and provides a reliable and stable radial support force for the inner wall surface of the thin-walled casing casting in a flexible support manner, which can not only reduce the deformation of the workpiece during the clamping process, but also suppress the cutting vibration of the workpiece during the machining process, thereby effectively improving the machining accuracy of the workpiece; by arranging a displacement sensor between the floating support top block and the rigid support slider during the machining process, the small displacement of the floating support top block relative to the rigid support slider during the machining process can be measured, and then the small displacement can be fed back in real time to the machining amount compensation controller of the machine tool, and finally the machine tool adjusts the cutting amount parameters in real time in a dynamic compensation manner, so that the dimensional parameters of the thin-walled casing casting are always within the set tolerance range, thereby further improving the machining accuracy of the workpiece, and effectively ensuring the dimensional consistency and product production quality of the thin-walled casing casting. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of an internal support fixture suitable for machining the outer wall surface of a thin-walled casing casting according to the present invention (viewing angle 1); Figure 2 It is a structural schematic diagram (viewing angle 2) of an inner support fixture (partial section view) suitable for machining the outer wall surface of a thin-walled casing casting of the present invention; Figure 3 It is a structural schematic diagram (viewing angle 3) of an inner support fixture (partial cross-section) suitable for machining the outer wall surface of a thin-walled casing casting of the present invention; Figure 4 It is a structural schematic diagram of the automatic centering component, the rigid support slider and the flexible support component assembly (partial cross-section) of the present invention; In the figure, 1 is a rigid support slider, 2 is a communicator, 3 is a support base plate, 4 is a support platform, 5 is a support column, 6 is a support ring frame, 7 is a transfer screw hole, 8 is a transfer positioning groove, 9 is an active bevel gear, 10 is a drive shaft, 11 is a driven bevel gear, 12 is a turntable, 13 is a limit plate, 14 is a hexagonal blind hole, 15 is a centering rail, 16 is a centering slider, 17 is a plane thread, 18 is a plane screw tooth, 19 is a floating support top block, 20 is a floating support rod, 21 is a thrust spring, and 22 is a support rod socket. DETAILED DESCRIPTION

[0015] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0016] like Figures 1 to 4 As shown, an internal support fixture suitable for processing the outer wall of a thin-walled casing casting comprises a base support assembly, an automatic centering assembly, a rigid support slider 1 and a flexible support assembly; the automatic centering assembly is arranged above the base support assembly, the rigid support slider 1 is arranged on the automatic centering assembly, and the flexible support assembly is arranged on the rigid support slider 1; a displacement sensor is arranged between the flexible support assembly and the rigid support slider 1; a communicator 2 is installed in the base support assembly, a signal receiving end of the communicator 2 is electrically connected to a signal output end of the displacement sensor, and a signal transmitting end of the communicator 2 is electrically connected to a processing amount compensation controller of a machine tool.

[0017] The base support assembly includes a supporting base plate 3, a supporting platform 4, a supporting column 5 and a supporting ring frame 6; the supporting platform 4 is fixedly arranged above the supporting base plate 3, and the supporting platform 4 and the supporting base plate 3 are coaxially distributed; the communicator 2 is fixedly arranged above the supporting platform 4; the supporting columns 5 are vertically fixed on the circumferential side edge above the supporting platform 4, and there are a plurality of supporting columns 5, and the plurality of supporting columns 5 are evenly distributed along the circumferential direction of the supporting platform 4; the supporting ring frame 6 is fixedly arranged on the top of the supporting columns 5, and the supporting ring frame 6 is coaxially distributed with the supporting base plate 3.

[0018] In this embodiment, the support base plate 3 adopts a disc-shaped structure, the support platform 4 adopts a truncated cone-shaped structure, the support columns 5 adopt a cylindrical structure, and the support ring frame 6 adopts a circular ring structure; the number of the support columns 5 is six.

[0019] A plurality of transfer screw holes 7 and transfer positioning grooves 8 are arranged on the surface of the support base plate 3 , and the support base plate 3 is adapted to be connected to the workbench of the machine tool through the transfer screw holes 7 and the transfer positioning grooves 8 .

[0020] In this embodiment, the transfer screw holes 7 include eight large holes and sixteen small holes, and the eight large holes and the sixteen small holes are evenly distributed along the circumferential direction of the support base plate 3; there are four transfer positioning grooves 8, and the four transfer positioning grooves 8 are evenly distributed along the circumferential direction of the support base plate 3.

[0021] The automatic centering assembly includes a driving bevel gear 9, a driving shaft 10, a driven bevel gear 11, a rotating disk 12 and a limiting disk 13; the driving shaft 10 is horizontally installed on the supporting ring frame 6, the center of the supporting ring frame 6 is located on the central axis of the driving shaft 10, and the driving shaft 10 has only a degree of freedom of rotation relative to the supporting ring frame 6; a hexagonal blind hole 14 is provided at the center of the outer end surface of the driving shaft 10; the driving bevel gear 9 is located on the inner side of the supporting ring frame 6, and the driving bevel gear 9 is coaxially fixed to the inner end of the driving shaft 10; the driven bevel gear 11 is located above the supporting ring frame 6, the driven bevel gear 11 is coaxially distributed with the supporting ring frame 6, and the driven bevel gear 11 is meshed with the driving bevel gear 9; the rotating disk 12 is located at the driven bevel gear 11, the rotary disk 12 is fixedly connected to the driven bevel gear 11 and the two are coaxially distributed; the limit disk 13 is located above the rotary disk 12, and the limit disk 13 is fixedly connected to the support ring frame 6, and a centering slide rail 15 is arranged on the limit disk 13, and the center line of the centering slide rail 15 is parallel to the radial direction of the support ring frame 6; a centering slider 16 is arranged inside the centering slide rail 15, and the centering slider 16 has only linear movement freedom relative to the centering slide rail 15; the rigid support slider 1 is fixedly installed above the centering slider 16; a plane thread 17 is fixedly provided on the upper surface of the rotary disk 12, and a plane screw tooth 18 is fixedly provided on the lower surface of the centering slider 16, and the plane screw tooth 18 is meshed with the plane thread 17.

[0022] The number of the drive shafts 10 is three or four and they are evenly distributed along the circumferential direction of the support ring frame 6 , and the inner end of each drive shaft 10 is coaxially fixedly connected with a driving bevel gear 9 .

[0023] In this embodiment, the number of the driving shafts 10 is three, the number of the active bevel gears 9 is three, and the angles between adjacent driving shafts 10 and adjacent active bevel gears 9 are both 120°.

[0024] The number of the centering rails 15 is three to six and they are evenly distributed along the circumference of the limiting disk 13 . A centering slider 16 is disposed in each centering rail 15 , and the distances between all the centering sliders 16 and the center of the limiting disk 13 are all equal.

[0025] In this embodiment, the number of the centering rails 15 is six, the number of the centering sliders 16 is six, and the angles between adjacent centering rails 15 and adjacent centering sliders 16 are both 60°.

[0026] The flexible support assembly includes a floating support top block 19, a floating support rod 20 and a thrust spring 21; a support rod socket 22 is provided on the outer facade of the centering slider 16; the thrust spring 21 is located at the bottom of the support rod socket 22; one end of the floating support rod 20 is inserted into the support rod socket 22 and is connected to the thrust spring 21, and the other end of the floating support rod 20 extends to the outside of the support rod socket 22 and is fixedly connected to the floating support top block 19, and the floating support rod 20 has axial freedom of movement relative to the support rod socket 22; the displacement sensor is arranged in the gap between the floating support top block 19 and the outer facade of the centering slider 16, and the displacement sensor is respectively connected to the floating support top block 19 and the centering slider 16.

[0027] There are two support rod sockets 22, which are symmetrically distributed left and right relative to the center line of the centering slider 16. A floating support rod 20 is inserted in each support rod socket 22, and a thrust spring 21 is arranged between each floating support rod 20 and the bottom of the support rod socket 22.

[0028] The following describes a one-time use process of the present invention in conjunction with the accompanying drawings: First, the inner support fixture of the present invention is fixedly connected to the machine tool worktable through the support bottom plate 3 of the base support assembly, and then the thin-walled casing casting to be processed is hoisted to the top of the inner support fixture, and then the height of the thin-walled casing casting is slowly lowered until the floating support top block 19 of the flexible support assembly enters the inner side of the thin-walled casing casting.

[0029] When the height of the thin-walled casing casting is adjusted, the driving shaft 10 is screwed using the hexagonal wrench and the hexagonal blind hole 14 to drive the active bevel gear 9 connected thereto to rotate synchronously. As the active bevel gear 9 rotates, the driven bevel gear 11 meshing therewith is further driven to rotate.

[0030] When the driven bevel gear 11 rotates, it will synchronously drive the turntable 12 fixed thereto to rotate synchronously, and then drive the planar thread 17 on the upper surface of the turntable 12 to rotate synchronously. At this time, the rotational motion of the planar thread 17 will be synchronously converted into the linear motion of the planar thread 18 and the centering slider 16 along the centering slide rail 15.

[0031] When the centering slider 16 moves linearly along the centering slide rail 15, it will drive the rigid support slider 1 to move synchronously, and then drive the flexible support assembly to move synchronously, along with the movement of the rigid support slider 1, until the floating support top block 19 of the flexible support assembly comes into contact with the inner wall surface of the thin-walled casing casting.

[0032] As the rigid support slider 1 continues to move, the distance between the rigid support slider 1 and the floating support top block 19 gradually decreases, and the floating support rod 20 gradually compresses the thrust spring 21 at the bottom of the support rod insertion hole 22. At this time, the rigid support slider 1 will indirectly provide radial support force to the inner wall surface of the thin-walled casing casting through the spring force output by the thrust spring 21.

[0033] After the thin-walled casing casting is supported and fixed on the inner support fixture, the hex wrench is removed. At this time, the thin-walled casing casting is automatically centered on the inner support fixture. Then the connection between the hanger and the thin-walled casing casting is disconnected, so that the thin-walled casing casting is completely on the workbench of the machine tool.

[0034] Before processing the outer wall surface of the thin-walled casing casting, first reset the value of the displacement sensor to zero, and then connect the displacement sensor to the processing amount compensation controller of the machine tool through the communicator 2. After the above preparations are completed, the processing of the outer wall surface of the thin-walled casing casting can begin.

[0035] When processing the outer wall of the thin-walled casing casting, the deformation of the thin-walled casing casting will be directly reflected to the displacement sensor through the floating support top block 19. At this time, the processing amount compensation controller of the machine tool will automatically correct the cutting amount parameters according to the data fed back by the displacement sensor to ensure that the dimensional parameters of the thin-walled casing casting are always within the set tolerance range, ultimately greatly improving the processing accuracy of the thin-walled casing casting.

[0036] The solutions in the embodiments are not intended to limit the protection scope of the present invention. All equivalent implementations or changes that do not deviate from the present invention are included in the protection scope of the present invention.

Claims

1. An internal support fixture suitable for machining the outer wall of a thin-walled casing casting, characterized in that: It includes a base support assembly, an automatic centering assembly, a rigid support slider and a flexible support assembly; the automatic centering assembly is arranged above the base support assembly, the rigid support slider is arranged on the automatic centering assembly, and the flexible support assembly is arranged on the rigid support slider; a displacement sensor is arranged between the flexible support assembly and the rigid support slider; a communicator is installed in the base support assembly, a signal receiving end of the communicator is electrically connected to a signal output end of the displacement sensor, and a signal transmitting end of the communicator is electrically connected to a processing amount compensation controller of a machine tool.

2. The inner support fixture suitable for machining the outer wall of a thin-walled casing casting according to claim 1, characterized in that: The base support assembly includes a supporting base plate, a supporting platform, a supporting column and a supporting ring frame; the supporting platform is fixedly arranged above the supporting base plate, and the supporting platform and the supporting base plate are coaxially distributed; the communicator is fixedly arranged above the supporting platform; the supporting columns are vertically fixedly mounted on the circumferential side edge portion above the supporting platform, and there are a number of supporting columns, which are evenly distributed along the circumferential direction of the supporting platform; the supporting ring frame is fixedly arranged on the top of the supporting columns, and the supporting ring frame is coaxially distributed with the supporting base plate.

3. The inner support fixture suitable for machining the outer wall of a thin-walled casing casting according to claim 2, characterized in that: A plurality of transfer screw holes and transfer positioning grooves are arranged on the surface of the support base plate, and the support base plate is adapted and connected to the workbench of the machine tool through the transfer screw holes and the transfer positioning grooves.

4. The inner support fixture suitable for machining the outer wall of a thin-walled casing casting according to claim 2, characterized in that: The automatic centering assembly includes an active bevel gear, a driving shaft, a driven bevel gear, a rotating disk and a limiting disk; the driving shaft is horizontally installed on the supporting ring frame, the center of the supporting ring frame is located on the central axis of the driving shaft, and the driving shaft has only a degree of rotational freedom relative to the supporting ring frame; an inner hexagonal blind hole is provided at the center of the outer end surface of the driving shaft; the active bevel gear is located on the inner side of the supporting ring frame, and the active bevel gear is coaxially fixed to the inner end of the driving shaft; the driven bevel gear is located above the supporting ring frame, the driven bevel gear and the supporting ring frame are coaxially distributed, and the driven bevel gear is meshed with the active bevel gear; the rotating disk is located at the driven bevel gear Above the gear, the rotating disk is fixedly connected to the driven bevel gear and the two are coaxially distributed; the limiting disk is located above the rotating disk, the limiting disk is fixedly connected to the supporting ring frame, a centering slide rail is arranged on the limiting disk, and the center line of the centering slide rail is parallel to the radial direction of the supporting ring frame; a centering slider is arranged inside the centering slide rail, and the centering slider has only linear movement freedom relative to the centering slide rail; the rigid support slider is fixedly installed above the centering slider; a plane thread is fixedly arranged on the upper surface of the rotating disk, and a plane screw tooth is fixedly arranged on the lower surface of the centering slider, and the plane screw tooth is meshed with the plane thread.

5. The inner support fixture suitable for machining the outer wall of a thin-walled casing casting according to claim 4, characterized in that: The number of the driving shafts is three or four and they are evenly distributed along the circumferential direction of the supporting ring frame, and the inner end of each driving shaft is coaxially fixedly connected with a driving bevel gear.

6. The inner support fixture for machining the outer wall of a thin-walled casing casting according to claim 4, characterized in that: The number of the centering slide rails is three to six and they are evenly distributed along the circumference of the limiting disk. A centering slider is arranged in each centering slide rail, and the distances between all the centering sliders and the center of the limiting disk are all equal.

7. The inner support fixture suitable for machining the outer wall of a thin-walled casing casting according to claim 4, characterized in that: The flexible support assembly includes a floating support top block, a floating support rod and a thrust spring; a support rod socket is provided on the outer facade of the centering slider; the thrust spring is located at the bottom of the support rod socket; one end of the floating support rod is inserted into the support rod socket and connected to the thrust spring, the other end of the floating support rod extends to the outside of the support rod socket and is fixedly connected to the floating support top block, and the floating support rod has axial freedom of movement relative to the support rod socket; the displacement sensor is arranged in the gap between the floating support top block and the outer facade of the centering slider, and the displacement sensor is respectively connected to the floating support top block and the centering slider.

8. The inner support fixture for machining the outer wall of a thin-walled casing casting according to claim 7, characterized in that: There are two support rod sockets, which are symmetrically distributed left and right relative to the center line of the centering slider. A floating support rod is inserted in each support rod socket, and a thrust spring is arranged between each floating support rod and the bottom of the support rod socket.

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