CN115255977A

CN115255977A - Lathe fixture for processing annular composite assembly and positioning method using same

Info

Publication number: CN115255977A
Application number: CN202211200853.0A
Authority: CN
Inventors: 徐伟; 殷杰
Original assignee: Jiangsu Qiqiang New Materials Co ltd
Current assignee: Jiangsu Qiqiang New Materials Co ltd
Priority date: 2022-09-29
Filing date: 2022-09-29
Publication date: 2022-11-01

Abstract

The invention discloses a lathe fixture for processing an annular composite component and a positioning method using the same. The annular composite component fixed by the lathe fixture has the advantages that the elastic ring can be compressed by the compression block along the radial direction, so that the deformation space of the elastic ring is extruded, and the displacement of the annular composite component caused by the deformation of the elastic ring in the actual turning process can be greatly reduced; in addition, the pressure head and the positioning block are used for positioning from the upper side and the side edge of the annular composite component respectively, so that the positioning accuracy of the annular composite component can be further improved, the positioning effect of the annular composite component is ensured, and the turning accuracy can be obviously improved in the actual turning process.

Description

Lathe fixture for processing annular composite assembly and positioning method using same

Technical Field

The invention relates to the technical field of lathe machining, in particular to a lathe fixture for machining an annular composite component and a positioning method using the lathe fixture.

Background

A lathe is a machine tool that performs turning on a rotating workpiece with a lathe tool. The lathe jig is a jig used for machining the inner and outer surfaces of revolution and the end surfaces of a workpiece on a lathe.

For large annular parts, a vertical lathe is usually used for lathing. However, the difficulty of positioning the annular part with a large volume is high, and the problems of inaccurate positioning center, deformation of the part, unstable clamping and the like often occur. In particular, if the lathe jig is not well designed, the machining quality of the annular irregularly shaped composite member is greatly reduced.

The annular composite component 100 shown in fig. 1 includes an annular member 101 and an elastic ring 102, the annular member 101 is made of an aluminum material, the elastic ring 102 is made of an elastic material, the annular member 101 includes an annular ring 103 and a flange 104 disposed on an end surface of the annular ring 103, the elastic ring 102 is sleeved in the annular ring 103, and an outer peripheral surface of the elastic ring 102 is attached to an inner peripheral surface of the annular ring 103. When it is necessary to machine the annular composite component 100 shown in fig. 1 using a lathe, since the annular member 101 is made of an aluminum material, a problem of deformation easily occurs when clamped using a jig; in addition, the ring-shaped member 101 is further provided with an outward flange 104, and how to fix the outward flange 104 is also a problem; the elastic ring 102 is made of an elastic material, and therefore, has a problem that the elastic ring is easy to displace after being positioned.

Therefore, how to accurately position the annular irregular-shaped composite component and improve the lathe machining quality is a difficult problem which is difficult to solve by a person skilled in the art.

Disclosure of Invention

The invention aims to overcome the defects of high positioning difficulty and poor machining quality of an annular irregular-shaped composite component in the prior art during machining by using a lathe, and provides a lathe fixture for machining the annular composite component and a positioning method using the lathe fixture.

The invention solves the technical problems through the following technical scheme:

the invention provides a lathe fixture for processing an annular composite assembly, which comprises an annular piece and an elastic ring, wherein the annular piece comprises an annular ring and an outward flange arranged on one end surface of the annular ring; the lathe jig includes:

the base is horizontally arranged and used for being fixed with the lathe main body;

the central positioning assembly comprises a central adjusting rod and a plurality of pressing blocks, the central adjusting rod is vertically arranged in the center of the base, the pressing blocks are arranged around the central adjusting rod, the pressing blocks are provided with pressing surfaces which can be attached to the inner circumferential surface of the elastic ring, and the central adjusting rod can control the pressing blocks to reciprocate along the radial direction of the central adjusting rod;

the blank pressing assembly comprises a pressing head and a first pull rod, the pressing head is installed above the base, the first pull rod is installed in the base, the pressing head bends downwards to form a space for containing the flanging, and the first pull rod can drive the pressing head to move vertically;

the radial positioning assembly comprises a sliding seat and a positioning block, the sliding seat is mounted on the base, the positioning block is arranged on the sliding seat and can move along the radial direction of the central adjusting rod, and the positioning block is provided with a positioning surface matched with the peripheral surface of the outward flanging;

the control system is connected with the central positioning assembly, the edge pressing assembly and the radial positioning assembly, the control system can control the pressing block to reciprocate along the radial direction of the central adjusting rod through the central adjusting rod, the control system can drive the pressing head to move vertically through the first pull rod, and the control system can control the positioning block to move along the radial direction of the central adjusting rod.

Preferably, the blank pressing assembly further comprises a placing block, the placing block is fixed on the base, the placing block is located below the pressure head, and a placing surface for placing the flanging is formed on the upper surface of the placing block.

Preferably, the blank pressing assembly further comprises an adjusting base plate, the adjusting base plate is clamped between the base and the placing block, the adjusting base plate and the base are detachably connected.

Preferably, a negative pressure pump is arranged in the pressure head, a plurality of air suction ports are formed on the surface, facing the flanging, of the pressure head, the air suction ports are communicated with the negative pressure pump, and the negative pressure pump can enable the air suction ports to form negative pressure.

Preferably, a first guide inclined plane is formed at the edge of the upper end face of the central adjusting rod, and a second guide inclined plane matched with the first guide inclined plane is arranged on the pressing block; a third guide inclined plane is formed on the outer side surface of the pressing block and extends in the direction away from the center adjusting rod from bottom to top; the base forms a central mounting hole for mounting the central positioning component, and the inner circumferential surface of the central mounting hole is provided with a fourth guide inclined surface matched with the third guide inclined surface.

Preferably, the radial positioning assembly further comprises a height adjusting portion, the height adjusting portion is fixed to the sliding seat, and the height adjusting portion is used for adjusting the height of the sliding seat.

Preferably, the height adjusting part includes:

the second pull rod is vertically arranged, extends to the position below the base and can vertically move under the control of the control system;

the connecting rod is fixed with the bottom of the sliding seat and is parallel to the second pull rod;

the connecting disc, the connecting disc with second pull rod, connecting rod are fixed mutually, the second pull rod can pass through connecting disc, connecting rod drive the sliding seat reciprocates.

Preferably, the radial positioning assembly includes a radial adjusting portion, the radial adjusting portion is connected to the sliding seat, and the radial adjusting portion is configured to adjust a radial displacement of the sliding seat along the center adjusting rod.

Preferably, the radial adjustment portion includes:

the vertical telescopic rod is vertically installed on the base and extends out of the base, and the vertical telescopic rod can vertically move under the control of the control system;

the upper surface of the base is provided with a radial sliding groove extending along the radial direction of the central adjusting rod, the transverse moving plate is installed in the radial sliding groove, one end of the transverse moving plate is fixed with the sliding seat, the other end of the transverse moving plate forms a first transverse guide surface, the first transverse guide surface extends from bottom to top in the direction far away from the vertical telescopic rod, and the vertical telescopic rod is provided with a second transverse guide surface matched with the first transverse guide surface;

the resetting mechanism is installed in the base and is abutted to the transverse moving plate, and the resetting mechanism always applies force to the transverse moving plate in the direction of the vertical telescopic rod.

The invention also provides a lathe machining positioning method for the annular composite component, which uses the lathe fixture for machining the annular composite component in the technical scheme, and the positioning method comprises the following steps:

placing the annular composite assembly on the base, placing an outward flanging of the annular composite assembly on a sliding seat of the radial positioning assembly and below a pressure head of the edge pressing assembly, and wrapping a pressing block of the central positioning assembly by an elastic ring of the annular composite assembly;

the control system controls a center adjusting rod of the center positioning assembly to move, so that the pressing block extends outwards, and a pressing surface of the pressing block presses the inner circumferential surface of the elastic ring;

the control system controls the pressure head to move downwards, so that the pressure head presses the flanging tightly;

the control system controls the positioning block to move along the radial direction, so that the positioning surface of the positioning block is abutted to the outer peripheral surface of the outer flanging.

On the basis of the common knowledge in the field, the above preferred conditions can be combined randomly to obtain the preferred embodiments of the invention.

The positive progress effects of the invention are as follows:

according to the lathe fixture for processing the annular composite component and the positioning method using the lathe fixture, the annular composite component is fixed by using the lathe fixture, the elastic ring is compressed by the compression block moving along the radial direction, so that the deformation space of the elastic ring is extruded, and the displacement of the annular composite component caused by the deformation of the elastic ring in actual turning can be greatly reduced; in addition, the pressure head and the positioning block are used for positioning from the upper side and the side edge of the annular composite component respectively, so that the positioning precision of the annular composite component can be further improved, the positioning effect of the annular composite component is ensured in the actual turning process, and the turning precision can be obviously improved.

Drawings

Fig. 1 is a schematic structural view of an annular composite component to which the lathe jig of the present invention is applied.

Fig. 2 is a schematic structural diagram of a first embodiment of the lathe fixture for machining an annular composite component according to the present invention.

Fig. 3 is a schematic view showing an internal structure of a ram of the jig for a lathe for machining a ring-shaped composite member shown in fig. 2.

Fig. 4 is a schematic structural view of a radial positioning assembly of a second embodiment of the lathe jig for machining an annular composite component according to the present invention.

Description of the reference numerals

Annular composite component 100

Annular member 101

Elastic ring 102

Annular ring 103

Flanging 104

Base 1

Center mounting hole 11

Fourth guide slope 12

Limiting support 13

Centering assembly 2

Center adjusting rod 21

Clamping block 22

Pressing surface 23

First guide slope 24

Second guide slope 25

Third guiding incline 26

Second pressure sensor 27

Position-limiting flange 28

Blank holder assembly 3

Indenter 31

First pull rod 32

First pressure sensor 33

Negative pressure pump 34

Extraction opening 35

Placing block 36

Mounting surface 37

Adjusting shim plate 38

Second height measuring instrument 39

Radial positioning assembly 4

Sliding seat 41

Positioning block 42

Locating surface 43

Height adjusting part 44

First height measuring instrument 45

Second pull rod 46

Connecting rod 47

Connecting disc 48

Radial adjustment part 49

Vertical telescopic rod 410

Laterally moving plate 411

Reset mechanism 412

First lateral guide surface 413

Second lateral guide surface 414

Extension spring 415

Lateral moving part 416

Transverse connection 417

Slag collecting pool 5

Slag suction port 51

A slag discharge passage 52.

Detailed Description

The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.

Example one

Fig. 2 shows an embodiment of a lathe jig for machining an annular composite component according to the present invention. The lathe fixture comprises a base 1, a central positioning component 2, a plurality of edge pressing components 3, a plurality of radial positioning components 4 and a control system, wherein the base 1 is horizontally arranged, and the base 1 is used for being fixed with a lathe main body; the central positioning assembly 2 comprises a central adjusting rod 21 and a plurality of pressing blocks 22, the central adjusting rod 21 is vertically arranged at the center of the base 1, the pressing blocks 22 are arranged around the central adjusting rod 21, the pressing blocks 22 are provided with pressing surfaces 23 which can be attached to the inner circumferential surfaces of the elastic rings 102, and the central adjusting rod 21 can control the pressing blocks 22 to reciprocate along the radial direction of the central adjusting rod 21; the edge pressing assembly 3 comprises a pressing head 31 and a first pull rod 32, the pressing head 31 is installed above the base 1, the first pull rod 32 is installed in the base 1, the pressing head 31 is bent downwards to form a space for accommodating the flanging 104, and the first pull rod 32 can drive the pressing head 31 to move vertically; the radial positioning assembly 4 comprises a sliding seat 41 and a positioning block 42, the sliding seat 41 is installed on the base 1, the positioning block 42 is arranged on the sliding seat 41 and can move along the radial direction of the central adjusting rod 21, and the positioning block 42 is provided with a positioning surface 43 matched with the peripheral surface of the outward flanging 104; the control system is connected with the central positioning assembly 2, the edge pressing assembly 3 and the radial positioning assembly 4, the control system can control the pressing block 22 to reciprocate along the radial direction of the central adjusting rod 21 through the central adjusting rod 21, the control system can drive the pressing head 31 to move vertically through the first pull rod 32, and the control system can control the positioning block 42 to move along the radial direction of the central adjusting rod 21.

When the above lathe fixture is used to position the annular composite component 100 shown in fig. 1, the following steps are included:

firstly, coarse positioning: firstly, placing the annular composite component 100 on the base 1, placing the flanging 104 of the annular composite component 100 on the sliding seat 41 of the radial positioning component 4 and below the pressure head 31 of the edge pressing component 3, and wrapping the pressing block 22 of the central positioning component 2 by the elastic ring 102 of the annular composite component 100;

second, centering: the control system controls the central adjusting rod 21 of the central positioning assembly 2 to move, so that the pressing block 22 extends outwards, the pressing surface 23 of the pressing block 22 presses the inner circumferential surface of the elastic ring 102, and the axis of the annular composite assembly 100 is coincided with the axis of the central adjusting rod 21;

thirdly, the control system controls the pressure head 31 to move downwards, so that the pressure head 31 presses the flanging 104, and the annular composite component 100 is fixed in the vertical direction, and the flanging 104 is also fixed;

fourth, the control system controls the positioning block 42 to move in the radial direction, so that the positioning surface 43 of the positioning block 42 abuts against the outer circumferential surface of the flange 104, thereby the annular composite component 100 is fixed again from the outside.

In the annular composite component 100 fixed by using the lathe fixture, since the pressing block 22 can move along the radial direction to press the elastic ring 102, the deformation space of the elastic ring 102 is extruded, and the displacement of the annular composite component 100 caused by the deformation of the elastic ring 102 in the actual turning process can be greatly reduced; in addition, the pressure head 31 and the positioning block 42 are used for positioning from the upper side and the side edge of the annular composite component 100 respectively, so that the positioning accuracy of the annular composite component 100 can be further improved, the positioning effect of the annular composite component 100 in the actual turning process is ensured, and the turning accuracy can be obviously improved.

Wherein, blank pressing subassembly 3, radial positioning subassembly 4 set up to a plurality ofly best, encircle the even setting of central positioning subassembly 2 circumference, and blank pressing subassembly 3, radial positioning subassembly 4 are arranged at interval each other. In this way, the annular composite component 100 can be uniformly stressed in the circumferential direction, and the optimal positioning effect can be achieved. Of course, in other embodiments, the blank holder assemblies 3 and the radial positioning assemblies 4 may also be arranged in other manners, and the fundamental positioning effect of this embodiment can also be achieved. The number and arrangement of the edge pressing assemblies 3 and the radial positioning assemblies 4 can be flexibly set according to the requirements of the stress points of the annular composite assembly 100.

The first tie-rod 32 of the hold-down assembly 3 can be connected to a pneumatic cylinder controlled by a control system to effect the vertical movement of the ram 31. The surface of the pressure head 31 facing the flanging 104 is provided with a first pressure sensor 33, the first pressure sensor 33 is used for measuring the pressure value of the pressure head 31 pressing the flanging 104, when the pressure value exceeds the warning value, the pressure value is fed back to the control system, and the control system controls the first pull rod 32 to stop moving downwards.

The inner surface of the ram 31 is preferably designed to conform to the surface of the flange 104 such that when the ram 31 is pressed against the flange 104, the inner surface of the ram 31 abuts the surface of the flange 104. As shown in fig. 3, a negative pressure pump 34 is arranged in the pressure head 31, a plurality of suction ports 35 are formed on the surface of the pressure head 31 facing the flanging 104, the suction ports 35 are communicated with the negative pressure pump 34, and the negative pressure pump 34 can enable the suction ports 35 to form negative pressure. When the formal machining is started, the control system controls the negative pressure pump 34 to work, so that the suction opening 35 forms negative pressure, and the flanging 104 is firmly adsorbed on the pressure head 31, thereby avoiding the displacement of the annular composite component 100 in the turning process.

As shown in fig. 2, the edge pressing assembly 3 further includes a placing block 36, the placing block 36 is fixed on the base 1, the placing block 36 is located below the pressing head 31, and a placing surface 37 for placing the flanging 104 is formed on the upper surface of the placing block 36. Further, blank pressing subassembly 3 still includes adjusting the backing plate 38, and adjusting the backing plate 38 presss from both sides between base 1 and placing block 36, adjusting the backing plate 38 and base 1 can be dismantled and be connected. By arranging the placing block 36, the height of the annular composite component 100 placed on the base 1 can be adjusted, so that the lathe fixture can adapt to annular composite components 100 with different specifications. The adjustment pad 38 may be designed with different thicknesses or different angles for use in combination with the placement block 36 to adjust the height or angle of the placement surface 37 of the placement block 36 to accommodate different specifications of annular composite assemblies 100.

One specific configuration of the centering assembly 2 is shown in FIG. 2. A first guide inclined plane 24 is formed at the edge of the upper end face of the central adjusting rod 21, and a second guide inclined plane 25 matched with the first guide inclined plane 24 is arranged on the pressing block 22; the outer side surface of the pressing block 22 forms a third guide inclined surface 26, and the third guide inclined surface 26 extends along the direction from bottom to top to the direction far away from the center adjusting rod 21; the base 1 forms a central mounting hole 11 for mounting the central positioning component 2, and the inner circumferential surface of the central mounting hole 11 is provided with a fourth guiding inclined surface 12 matched with the third guiding inclined surface 26.

Since the central adjusting rod 21 is matched with the pressing block 22 through the first guide inclined surface 24 and the second guide inclined surface 25, and the pressing block 22 is matched with the central mounting hole 11 through the third guide inclined surface 26 and the fourth guide inclined surface 12, when the annular composite component 100 needs to be fixed, and the central adjusting rod 21 moves upwards, the pressing block 22 moves outwards, so that the pressing surface 23 of the pressing block 22 presses the inner peripheral surface of the elastic ring 102; when the annular composite component 100 needs to be removed, the central adjusting rod 21 moves downwards, and the pressing block 22 retracts inwards due to the gravity, so that the annular composite component 100 can be removed.

The central adjusting rod 21 of the central positioning assembly 2 can be connected with a cylinder controlled by a control system, so as to realize the radial movement of the pressing block 22. The pressing surface 23 of the pressing block 22 is provided with a second pressure sensor 27. The second pressure sensor 27 is used for measuring the pressure value of the pressing block 22 on the elastic ring 102, and when the pressure value exceeds the warning value, the pressure value is fed back to the control system, and the control system controls the central adjusting rod 21 to stop moving upwards.

The central adjusting rod 21 is provided with a limit flange 28 along the circumferential direction, and the base 1 is provided with a limit support 13 positioned below the limit flange 28. The position limiting flange 28 is used for limiting the limit position of the downward movement of the center adjusting rod 21, and when the center adjusting rod 21 moves downward to the limit position, the position limiting flange 28 is clamped above the position limiting support 13.

One specific construction of the radial positioning assembly 4 is shown in fig. 2. The radial positioning assembly 4 further comprises a height adjusting portion 44, the height adjusting portion 44 is fixed with the sliding seat 41, and the height adjusting portion 44 is used for adjusting the height of the sliding seat 41. By providing the height adjusting portion 44 and adjusting the height of the sliding seat 41, the height of the annular composite component 100 placed on the sliding seat 41 can be adjusted, so that the lathe fixture can be adapted to annular composite components 100 of different specifications.

In order to keep the annular composite component 100 placed on a horizontal plane, the upper surface of the sliding seat 41 is provided with a first height measuring instrument 45, the placing surface 37 of the placing block 36 is provided with a second height measuring instrument 39, and the first height measuring instrument 45 and the second height measuring instrument 39 are connected with the control system. When the height values of the first height measuring instrument 45 and the second height measuring instrument 39 transmitted to the control system are the same, the sliding seat 41 and the placing block 36 are located on the same horizontal plane, so that the annular composite component 100 can be placed on the same horizontal plane.

Specifically, the height adjusting part 44 includes a second pull rod 46, a connecting rod 47 and a connecting disc 48, the second pull rod 46 is vertically arranged, the second pull rod 46 extends to the lower part of the base 1, and the second pull rod 46 can vertically move under the control of the control system; the connecting rod 47 is fixed with the bottom of the sliding seat 41, and the connecting rod 47 is parallel to the second pull rod 46; the connecting disc 48 is fixed with the second pull rod 46 and the connecting rod 47, and the second pull rod 46 can drive the sliding seat 41 to move up and down through the connecting disc 48 and the connecting rod 47.

The second pull rod 46 may be connected to a cylinder controlled by a control system. Under the control of the control system, the second pull rod 46 can move vertically, and the second pull rod 46 drives the sliding seat 41 to move up and down through the connecting disc 48 and the connecting rod 47, so that the height of the sliding seat 41 is adjusted.

The lathe fixture further comprises a slag collecting pool 5, wherein the slag collecting pool 5 is installed on the upper surface of the base 1, a plurality of slag suction ports 51 are formed at the bottom of the slag collecting pool 5, and the slag suction ports 51 are communicated with a slag discharging channel 52. When machining is performed, the slag discharge passage 52 is made negative pressure, and the generated waste is discharged through the slag suction port 51.

Example two

Most of the structure of this embodiment is the same as that of the first embodiment. The difference is in the construction of the radial positioning assembly 4.

In the present embodiment, the radial positioning assembly 4 does not include the height adjustment portion 44, but includes the radial adjustment portion 49. The radial direction adjusting portion 49 is connected to the sliding seat 41, and the radial direction adjusting portion 49 is used for adjusting the displacement of the sliding seat 41 in the radial direction of the center adjusting rod 21. The radial position of the sliding seat 41 is adjusted by the radial adjusting portion 49 so as to meet the requirements of the annular composite components 100 of different shapes.

As shown in fig. 4, the radial adjusting portion 49 includes a vertical telescopic rod 410, a horizontal moving plate 411 and a reset mechanism 412, the vertical telescopic rod 410 is vertically installed on the base 1 and extends out of the base 1, and the vertical telescopic rod 410 can vertically move under the control of the control system; the upper surface of the base 1 is provided with a radial sliding groove (not shown in the figure) extending along the radial direction of the central adjusting rod 21, the transverse moving plate 411 is installed in the radial sliding groove, one end of the transverse moving plate 411 is fixed with the sliding seat 41, the other end of the transverse moving plate 411 forms a first transverse guide surface 413, the first transverse guide surface 413 extends from bottom to top in the direction far away from the vertical telescopic rod 410, and the vertical telescopic rod 410 is provided with a second transverse guide surface 414 matched with the first transverse guide surface 413; the reset mechanism 412 is installed in the base 1, the reset mechanism 412 is abutted against the horizontal moving plate 411, and the reset mechanism 412 always applies a force to the horizontal moving plate 411 in the direction of the vertical telescopic rod 410.

Because the vertical telescopic rod 410 and the transverse moving plate 411 are matched through the first transverse guide surface 413 and the second transverse guide surface 414, when the vertical telescopic rod 410 moves downwards, the transverse moving plate 411 is driven to move outwards, so that the sliding seat 41 moves outwards along the radial direction; when the telescopic rod 410 moves upward, the reset mechanism 412 pushes the traverse plate 411 inward, so that the sliding seat 41 moves inward in the radial direction.

An extension spring 415 is arranged in the vertical telescopic rod 410, one end of the extension spring 415 is fixed with the base 1, and the other end of the extension spring 415 is fixed with the vertical telescopic rod 410. When the vertical telescopic rod 410 is pulled down, the extension spring 415 is extended; when the vertical telescopic rod 410 moves upwards, the extension spring 415 applies an upward force to the vertical telescopic rod 410, so that the vertical telescopic rod 410 is reset.

The traverse plate 411 includes a traverse portion 416 and a traverse connection portion 417, the first traverse guide surface 413 is located on the traverse portion 416, and the traverse connection portion 417 connects the traverse portion 416 and the slide holder 41. When the height or angle of the sliding seat 41 needs to be adjusted, it can be realized by replacing the transverse connecting portion 417 with a different shape.

While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the invention is defined by the appended claims. Various changes or modifications to these embodiments may be made by those skilled in the art without departing from the principle and spirit of this invention, and these changes and modifications are within the scope of this invention.

Claims

1. A lathe fixture for processing an annular composite assembly comprises an annular piece and an elastic ring, wherein the annular piece comprises an annular ring and a flanging arranged on one end face of the annular ring, the elastic ring is sleeved in the annular ring, and the outer peripheral surface of the elastic ring is attached to the inner peripheral surface of the annular ring; characterized in that, the lathe fixture includes:

2. The turning attachment for annular composite component machining according to claim 1, wherein the blank holder assembly further includes a placement block fixed to the base, the placement block being located below the ram, an upper surface of the placement block forming a placement surface for placing the flanging.

3. The turning attachment for annular composite component machining of claim 2, wherein the hold-down assembly further comprises an adjusting shim plate, the adjusting shim plate is sandwiched between the base and the placement block, and the placement block and the adjusting shim plate are detachably connected with the base.

4. The turning attachment for processing an annular composite component according to claim 1, wherein a negative pressure pump is provided in the pressure head, a plurality of suction ports are formed in a surface of the pressure head facing the flange, the suction ports are communicated with the negative pressure pump, and the negative pressure pump can make the suction ports form negative pressure.

5. The turning attachment for processing an annular composite component according to claim 1, wherein an edge of an upper end surface of the center adjusting rod forms a first guide slope, and the pressing block is provided with a second guide slope which is matched with the first guide slope; a third guide inclined plane is formed on the outer side surface of the pressing block and extends in the direction away from the central adjusting rod from bottom to top; the base forms a central mounting hole for mounting the central positioning assembly, and the inner circumferential surface of the central mounting hole is provided with a fourth guide inclined surface matched with the third guide inclined surface.

6. The turning attachment for annular composite component machining according to claim 1, wherein the radial positioning member further includes a height adjusting portion fixed to the slide base, the height adjusting portion being configured to adjust a height of the slide base.

7. The composite annular assembly machining lathe jig of claim 6, wherein the height adjusting portion includes:

and the connecting disc is fixed with the second pull rod and the connecting rod, and the second pull rod can drive the sliding seat to move up and down through the connecting disc and the connecting rod.

8. The annular composite member machining lathe jig of claim 1, wherein the radial positioning member includes a radial adjustment portion connected to the slide holder, the radial adjustment portion being configured to adjust a displacement of the slide holder in a radial direction of the center adjustment rod.

9. The annular composite component machining lathe fixture of claim 8, wherein the radial adjustment portion comprises:

the upper surface of the base is provided with a radial sliding groove extending along the radial direction of the central adjusting rod, the transverse moving plate is installed in the radial sliding groove, one end of the transverse moving plate is fixed with the sliding seat, the other end of the transverse moving plate forms a first transverse guide surface, the first transverse guide surface extends in the direction away from the vertical telescopic rod from bottom to top, and the vertical telescopic rod is provided with a second transverse guide surface matched with the first transverse guide surface;

10. A method for positioning an annular composite member for lathe machining, which uses the turning jig for annular composite member machining claimed in any one of claims 1 to 9, the method comprising the steps of: