Clamp for machining turbine shell

Abstract

The utility model relates to a clamp for machining a turbine shell, which belongs to the field of turning clamps and comprises a chuck, at least three clamping mechanisms are arranged at one end of the chuck, the clamping mechanisms are circumferentially distributed by taking the axis of the chuck as the center, each clamping mechanism comprises a mounting seat, and the mounting seats are in sliding connection with the chuck along the radial direction of the chuck. The top of the mounting base is concaved inwards to form a mounting groove, a clamping jaw is arranged in the mounting groove and rotationally connected with the mounting base through a pin shaft, a gap is formed between the clamping jaw and the inner wall of the side, close to the chuck, of the mounting groove, the side, close to the axis of the chuck, of the clamping jaw is in an arc shape, and the side, close to the axis of the chuck, of the clamping jaw is inclined. According to the utility model, the clamping surface of the clamping jaw is obliquely arranged, so that the clamping surface of the clamping jaw is attached to the inclined surface of the exhaust end of the turbine shell, the surface contact between the clamping jaw and the inclined surface of the exhaust end of the turbine shell is realized, and the fixing stability of the turbine shell is improved.

Description

Technical Field

[0001] The utility model relates to a clamp for machining a turbine shell, belonging to the field of lathe machining clamps. Background Art

[0002] A turbine is a fan in a car or airplane engine that uses exhaust gas to blow fuel vapor into the engine to improve engine performance. A turbine is a rotary power machine that converts the energy of a flowing medium into mechanical work. Common turbines have a unique shape, and the corresponding turbine shell machining process requires a special fixture to fix the turbine shell for the vertical lathe operation of the turbine shell.

[0003] A Chinese utility model patent with announcement number CN216226941U discloses a turning fixture for a turbine housing, wherein the turbine housing has an annular boss, and the turning fixture includes a chuck, a first tightening assembly, a second tightening assembly, and a third tightening assembly, wherein the first tightening assembly, the second tightening assembly, and the third tightening assembly all include a top claw and a pressure plate disposed on the top claw, wherein the top claw has a first plane, a second plane, and a vertical connecting surface, wherein the lower surface of the pressure plate is in contact with the first plane of the top claw, and one end of the pressure plate extends out of the first plane of the top claw, and forms a space for accommodating the annular boss between the pressure plate and the second plane and the vertical connecting surface of the top claw; the pressure plate and the top claw are connected by a fastening assembly, and the fastening assembly includes a fastener, and an elastic member sleeved on the fastener, wherein the elastic member is located between the other end of the fastener and the pressure plate. The turning clamp provided by the utility model utilizes the large elastic force of the elastic member when clamping the turbine shell, and the top claw and the pressure plate can elastically clamp the turbine shell to achieve rapid clamping. The size of the processing after clamping is guaranteed to be stable and the workpiece will not be damaged. However, when the model of the turbine shell changes, such as when the exhaust port of the turbine shell has no annular boss, it is difficult to clamp effectively, and because the exhaust end of the turbine shell has a draft angle of 2°, when it is directly clamped on the exhaust end of the turbine shell, the clamping claw and the exhaust end are in line contact, which can easily affect the stability of the turbine shell fixation.

[0004] Therefore, there is a need for a turbine shell processing fixture to improve the stability of turbine shell fixation. Utility Model Content

[0005] The technical problem to be solved by the utility model is: in order to overcome the deficiencies of the prior art, a turbine shell processing fixture is provided to improve the fixing stability of the turbine shell.

[0006] The technical solution adopted by the utility model to solve the above-mentioned problem is: a fixture for processing a turbine casing, comprising a chuck, at least three clamping mechanisms are arranged at one end of the chuck, and each clamping mechanism is circumferentially distributed with the axis of the chuck as the center, the clamping mechanism comprises a mounting seat, the mounting seat and the chuck are radially slidably connected to the chuck, the top of the mounting seat is concave to form a mounting groove, a clamping claw is arranged in the mounting groove, the clamping claw is rotatably connected to the mounting seat through a pin shaft, a gap is arranged between the clamping claw and the inner wall of the mounting groove close to the chuck side, the side of the clamping claw close to the chuck axis is arc-shaped, the side of the clamping claw close to the chuck axis is inclined, the clamping claw is elastically connected to the mounting seat, the clamping claw is connected to the mounting seat through a locking member, and the clamping claw is driven to rotate around the pin shaft through the locking member.

[0007] Preferably, the side of the clamping jaw close to the chuck is connected to the side of the mounting seat away from the chuck through a spring.

[0008] Preferably, a first blind hole is provided on the side of the clamp close to the chuck, a second blind hole is provided on the inner wall of the mounting groove close to the chuck, the two ends of the spring are respectively inserted into the first blind hole and the second blind hole, and the two ends of the spring are respectively connected to the inner wall of the first blind hole and the inner wall of the second blind hole.

[0009] Preferably, the inclination angle of the side of the clamping jaw close to the chuck axis is 2°.

[0010] Preferably, the distance between one end of the clamping jaw close to the chuck and the axis of the chuck is greater than the distance between the other end of the clamping jaw and the axis of the chuck.

[0011] Preferably, the mounting seat includes a first seat body and a second seat body, the first seat body is slidably connected to the chuck, the second seat body is located on the side of the first seat body away from the chuck, the mounting groove and the second blind hole are both arranged on the second seat body, and the first seat body and the second seat body are detachably fixedly connected.

[0012] Preferably, a counterweight is connected to the chuck.

[0013] Preferably, at least three counterweight blocks are provided, and the counterweight blocks are distributed circumferentially with the axis of the chuck as the center, and the counterweight blocks and the clamping mechanisms are arranged alternately.

[0014] Preferably, the locking member is a screw.

[0015] Preferably, a side of the clamping jaw close to the axis of the chuck is provided with anti-slip grooves.

[0016] Compared with the prior art, the advantages of the utility model are:

[0017] The utility model discloses a clamp for machining a turbine shell. The clamping surface of the clamping jaw is tilted so that the clamping surface of the clamping jaw fits with the inclined surface of the exhaust end of the turbine shell, thereby achieving surface contact between the clamping jaw and the inclined surface of the exhaust end of the turbine shell, thereby improving the stability of fixing the turbine shell. Moreover, the tilted clamping surface of the clamping jaw can also cause the turbine shell to be subjected to a thrust in a direction close to a chuck. Since the turbine shell abuts against a side of a mounting seat away from the chuck, self-locking of the turbine shell along the axial direction of the chuck is achieved, thereby further improving the stability of fixing the turbine shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a three-dimensional diagram of a fixture for machining a turbine shell according to the utility model;

[0019] Figure 2 is a three-dimensional diagram of the clamping mechanism;

[0020] Figure 3 is a cross-sectional view of the clamping mechanism;

[0021] Figure 4 is a three-dimensional diagram of the gripper;

[0022] Figure 5 is a cross-sectional view of the clamping jaw;

[0023] Figure 6 is a three-dimensional diagram of the second seat body;

[0024] Figure 7 It is a cross-sectional view of the second seat body.

[0025] in:

[0026] Chuck 1, clamping mechanism 2, counterweight block 3;

[0027] Mounting seat 21, mounting groove 22, clamping claw 23, pin 24, spring 25, first blind hole 26, second blind hole 27;

[0028] A first base body 211 and a second base body 212 . DETAILED DESCRIPTION

[0029] like Figure 1-7 As shown, a turbine shell processing fixture in this embodiment includes a chuck 1, one end of the chuck 1 is provided with three clamping mechanisms 2, the three clamping mechanisms 2 are evenly distributed circumferentially with the axis of the chuck 1 as the center, three counterweight blocks 3 are connected to the chuck 1, the three counterweight blocks 3 are all arranged at the end of the chuck 1 provided with the clamping mechanism 2, the three counterweight blocks 3 are evenly distributed circumferentially with the axis of the chuck 1 as the center, the three counterweight blocks 3 are staggered with the three clamping mechanisms 2, and the function of the counterweight blocks 3 is to achieve the balance of the chuck 1 and improve the rotation stability of the chuck 1;

[0030] The clamping mechanism 2 includes a mounting seat 21, and the mounting seat 21 is slidably connected with the chuck 1 along the radial direction of the chuck 1. The top of the mounting seat 21 is concave to form a mounting groove 22, and a clamping claw 23 is arranged in the mounting groove 22, and the clamping claw 23 is rotatably connected with the mounting seat 21 through a pin shaft 24. A gap is arranged between the clamping claw 23 and the inner wall of the mounting groove 22 on the side close to the chuck 1, and the side of the clamping claw 23 close to the axis of the chuck 1 is arc-shaped, and the side of the clamping claw 23 close to the axis of the chuck 1 is inclined. The inclination angle of the side of the clamping claw 23 close to the axis of the chuck 1 is 2°, and the distance between one end of the clamping claw 23 close to the chuck 1 and the axis of the chuck 1 is greater than the distance between the other end of the clamping claw 23 and the axis of the chuck 1, and the side of the clamping claw 23 close to the chuck 1 is connected to the side of the mounting seat 21 away from the chuck 1 through a spring 25, and the clamping claw 23 is connected to the mounting seat 21 through a locking member, and the clamping claw 23 is driven to rotate around the pin shaft 24 through the locking member;

[0031] A first blind hole 26 is provided on one side of the clamping jaw 23 close to the chuck 1, and a second blind hole 27 is provided on the inner wall of the mounting groove 22 close to the chuck 1. The first blind hole 26 and the second blind hole 27 are arranged opposite to each other, and both ends of the spring 25 are respectively inserted into the first blind hole 26 and the second blind hole 27, and both ends of the spring 25 are respectively connected to the inner wall of the first blind hole 26 and the inner wall of the second blind hole 27;

[0032] The chuck 1 is connected to the rotation system of the lathe, and the chuck 1 can be driven to rotate by the rotation system. In fact, a clamping system is provided on the chuck 1, and the clamping system is connected to the mounting seat 21. Each mounting seat 21 is driven to move radially along the chuck 1 by the clamping system. The movement of the mounting seat 21 drives the clamping jaws 23 to move synchronously, so that the clamping jaws 23 can be adjusted according to the diameter of the exhaust end of the turbine shell. During the clamping of the turbine shell, the turbine shell is pressed against the side of the mounting seat 21 away from the chuck 1, and the clamping jaws 23 and the mounting seat 21 are locked by the locking member. The locking member can be a screw, and during the locking period, the clamping jaws 23 are driven to rotate around the pin shaft 24, and the spring 2 5 is deformed, and the side of the clamping jaw 23 close to the axis of the chuck 1, that is, the clamping surface of the clamping jaw 23, is fitted with the inclined outer wall of the exhaust end of the turbine shell by the rotation of the clamping jaw 23, so that the clamping jaw 23 and the inclined surface of the exhaust end of the turbine shell are in surface contact. Compared with the line contact clamping, the surface contact clamping improves the stability of the turbine shell fixation. When the chuck 1 rotates, it drives the turbine shell to rotate synchronously and perform machining. After the turbine shell is machined, the locking piece is released, and the elastic action of the spring 25 causes the clamping jaw 23 to rotate in the opposite direction around the pin 24, so that the clamping jaw 23 is separated from the turbine shell, and the relative position between the clamping jaw 23 and the mounting seat 21 is reset. Finally, the turbine shell can be removed;

[0033] Since the clamping surface of the clamping jaw 23 is inclined and the clamping surface of the clamping jaw 23 is in contact with the inclined surface of the exhaust end of the turbine shell, the turbine shell is subjected to a thrust in the direction close to the chuck 1, and since the turbine shell abuts against the side of the mounting seat 21 away from the chuck 1, the turbine shell is self-locked along the axial direction of the chuck 1, and the stability of the fixing of the turbine shell is further improved;

[0034] Of course, in order to meet the process requirements, a gasket can be set in the installation groove 22, one side of the gasket is in contact with the side of the clamping jaw 23 close to the chuck 1, and the other side of the gasket is in contact with the inner wall of the installation groove 22 close to the chuck 1, and there can be multiple gaskets, and the multiple gaskets are stacked and arranged along the axial direction of the chuck 1;

[0035] The mounting seat 21 includes a first seat body 211 and a second seat body 212, wherein the first seat body 211 is slidably connected to the chuck 1, and the second seat body 212 is located on a side of the first seat body 211 away from the chuck 1, and the mounting groove 22 and the second blind hole 27 are both provided on the second seat body 212, and the first seat body 211 and the second seat body 212 are detachably fixedly connected;

[0036] In addition, when an interference portion is provided on the exhaust end of the turbine housing, such as a protrusion, in order to avoid interference, the distance between one of the three pins 24 and the axis of the chuck 1 may be greater than the distance between the other two pins 24 and the axis of the chuck 1;

[0037] The side of the clamping jaw 23 close to the axis of the chuck 1 is provided with anti-skid patterns, that is, the clamping surface of the clamping jaw 23 is provided with anti-skid patterns, and the friction between the clamping jaw 23 and the turbine shell is increased by the anti-skid patterns, thereby further improving the stability of the turbine shell clamping;

[0038] In summary, by tilting the clamping surface of the jaw 23 so that the clamping surface of the jaw 23 fits against the inclined surface of the exhaust end of the turbine shell, the surface contact between the jaw 23 and the inclined surface of the exhaust end of the turbine shell is achieved, thereby improving the stability of the fixation of the turbine shell. Moreover, through the tilted clamping surface of the jaw 23, the turbine shell can also be subjected to a thrust in the direction close to the chuck 1. Since the turbine shell abuts against the side of the mounting seat 21 away from the chuck 1, the self-locking of the turbine shell along the axial direction of the chuck 1 is achieved, thereby further improving the stability of the fixation of the turbine shell.

[0039] In addition to the above embodiments, the present invention also includes other implementation modes. Any technical solutions formed by equivalent transformation or equivalent replacement should fall within the protection scope of the claims of the present invention.

Claims

1. A fixture for machining a turbine housing, comprising a chuck (1), one end of the chuck (1) being provided with at least three clamping mechanisms (2), each clamping mechanism (2) being distributed circumferentially around the axis of the chuck (1), characterized in that: The clamping mechanism (2) comprises a mounting seat (21), wherein the mounting seat (21) is connected to the chuck (1) in a radially sliding manner along the chuck (1), the top of the mounting seat (21) is concave to form a mounting groove (22), a clamping jaw (23) is arranged in the mounting groove (22), the clamping jaw (23) is rotatably connected to the mounting seat (21) through a pin shaft (24), a gap is arranged between the clamping jaw (23) and the inner wall of the mounting groove (22) on the side close to the chuck (1), the side of the clamping jaw (23) close to the axis of the chuck (1) is arc-shaped, the side of the clamping jaw (23) close to the axis of the chuck (1) is inclined, the clamping jaw (23) is elastically connected to the mounting seat (21), the clamping jaw (23) is connected to the mounting seat (21) through a locking member, and the clamping jaw (23) is driven to rotate around the pin shaft (24) through the locking member.

2. A fixture for machining a turbine housing according to claim 1, characterized in that: The side of the clamping jaw (23) close to the chuck (1) is connected to the side of the mounting seat (21) away from the chuck (1) through a spring (25).

3. A turbine housing machining fixture according to claim 2, characterized in that: A first blind hole (26) is provided on a side of the clamping jaw (23) close to the chuck (1), a second blind hole (27) is provided on an inner wall of the mounting groove (22) close to the chuck (1), two ends of the spring (25) are respectively inserted into the first blind hole (26) and the second blind hole (27), and the two ends of the spring (25) are respectively connected to the inner wall of the first blind hole (26) and the inner wall of the second blind hole (27).

4. A fixture for machining a turbine housing according to claim 1, characterized in that: The side of the clamping jaw (23) close to the axis of the chuck (1) has an inclination angle of 2°.

5. A fixture for machining a turbine housing according to claim 1, characterized in that: The distance between one end of the clamping jaw (23) close to the chuck (1) and the axis of the chuck (1) is greater than the distance between the other end of the clamping jaw (23) and the axis of the chuck (1).

6. A fixture for machining a turbine housing according to claim 1, characterized in that: The mounting seat (21) comprises a first seat body (211) and a second seat body (212); the first seat body (211) is slidably connected to the chuck (1); the second seat body (212) is located on a side of the first seat body (211) away from the chuck (1); the mounting groove (22) and the second blind hole (27) are both arranged on the second seat body (212); the first seat body (211) and the second seat body (212) are detachably fixedly connected.

7. A fixture for machining a turbine housing according to claim 1, characterized in that: A counterweight block (3) is connected to the chuck (1).

8. A fixture for machining a turbine housing according to claim 7, characterized in that: At least three counterweight blocks (3) are provided, and each counterweight block (3) is distributed circumferentially with the axis of the chuck (1) as the center, and each counterweight block (3) and each clamping mechanism (2) are arranged in a staggered manner.

9. A fixture for machining a turbine housing according to claim 1, characterized in that: The locking piece is a screw.

10. The fixture for machining a turbine housing according to claim 1, characterized in that: The side of the clamping jaw (23) close to the axis of the chuck (1) is provided with anti-slip grooves.

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