CN107127619B

CN107127619B - High-precision synchronizer gear ring hot post-processing grooving clamp

Info

Publication number: CN107127619B
Application number: CN201710526007.0A
Authority: CN
Inventors: 袁培峰
Original assignee: Tianjin Tanhas Technology Co Ltd
Current assignee: Tianjin Tanhas Technology Co Ltd
Priority date: 2017-06-30
Filing date: 2017-06-30
Publication date: 2023-05-02
Anticipated expiration: 2037-06-30
Also published as: CN107127619A

Abstract

The invention provides a high-precision synchronizer gear ring hot post-processing grooving clamp which mainly comprises a transition connecting disc, a clamp body, a positioning disc, an expansion sleeve, a connecting column, three rotary pull rods, a pressing block, a pressing disc, a spring, a pushing disc and a guide screw. The clamp can clamp the workpiece on the expansion sleeve, and can realize the anticlockwise rotation of the pressing block and the compression of the workpiece through the cooperation of the rotary pull rod and the guide screw, thereby rapidly realizing the centering and the end face compression of the workpiece, greatly improving the processing efficiency and the processing quality, and being convenient and rapid to operate; the method is not only convenient for grooving the thin-wall part, but also particularly for machining the hot workpiece, and has outstanding advantages for guaranteeing the quality. And is applicable not only to thin-walled workpieces but also to non-thin-walled workpieces.

Description

High-precision synchronizer gear ring hot post-processing grooving clamp

Technical Field

The invention belongs to the field of synchronizer gear sleeve machining equipment, and particularly relates to a high-precision synchronizer gear ring hot post-machining grooving clamp.

Background

The synchronizer is used as an important part for gear shifting application in a gearbox, and the current design is developed towards the light weight direction for adapting to energy conservation and consumption reduction; to achieve comfortable shifting, synchronizer designs have reached a high level of accuracy. The manufacturing of the light-weight high-precision synchronizer not only needs to have good process, personnel and equipment, but also needs to have process equipment capable of meeting the processing requirements.

Fig. 1 shows a synchronizer gear sleeve workpiece to be processed, the workpiece structure is a thin-wall workpiece, the heat treatment is easy to deform, roundness errors of an inner hole can be generated, generally, the heat treatment is controlled within 0.04mm, the inner hole also has a certain degree of shrinkage cavity, and a ring groove a marked by a thick solid line in the figure is a processing part. In the aspect of tool clamp design, the conventional structural clamp is of an internal expansion type, the inner hole of a workpiece is easy to deform due to large tension force, and an inner hole with a roundness error of 0.04mm is immediately reflected to an outer ring groove after machining in a clamping state, so that error is reflected, and a qualified machined product is not easy to obtain. For the structural workpiece shown in the above figure, a positioning and clamping scheme of inner hole slight expansion (without deforming the workpiece again or minimal deformation) and end face compression is sought after for analysis through practical experience for many years.

Disclosure of Invention

The synchronizer gear sleeve is a thin-wall part, the clamping surface of the positioning surface is very small, the heat treatment mode of the workpiece is carburizing and quenching, the roundness of the internal spline is not easy to control, the internal spline is easy to clamp and deform as a processing reference after heat treatment, errors are repeated, and the requirements of radial runout and runout are difficult to meet. Therefore, a groove turning clamp for inner hole slight expansion and end face spinning is designed.

The technical scheme of the invention is realized as follows:

a hot post-processing grooving clamp for a high-precision synchronizer gear ring mainly comprises a transition connecting disc, a clamp body, a positioning disc, an expansion sleeve, a connecting column, three rotary pull rods, a pressing block, a pressing disc, a spring, a pushing disc and a guide screw;

the transition connecting disc, the clamp body and the positioning disc are fixedly connected in sequence;

the transition connecting disc comprises a disc-shaped body, and a through hole for the blind rivet to pass through is formed in the axis of the body;

the clamp body comprises a disc-shaped clamp body and a clamp boss which are coaxial, the clamp body is provided with a containing cavity, the center of the clamp boss is provided with a boss through hole, three rotary pull rod through holes are uniformly distributed on the circumference around the boss through hole, and each rotary pull rod through hole is respectively penetrated with one rotary pull rod; three connecting column passing holes which are communicated with the accommodating cavity and used for the connecting columns to pass through are uniformly distributed on the clamp body around the clamp boss and can move in the connecting column passing holes; the two ends of the connecting column are respectively propped against and fixedly connected with the pressure plate and the expansion sleeve;

the outer side of the top of the clamp boss forms a conical surface section, and the diameter of the conical surface section gradually expands from the top end to the rear;

the pushing disc is positioned in the accommodating cavity of the clamp body, three rotary pull rod mounting holes are formed in the circumference of the pushing disc, one end of the rotary pull rod is arranged in the rotary pull rod mounting hole and can be axially fixed relative to the pushing disc, and the pushing disc can rotate around the axis of the pushing disc; the other end of the rotary pull rod is fixedly connected with a pressing block;

the pressure plate is also positioned in the accommodating cavity of the clamp body, and is arranged between the pushing plate and the cavity bottom of the accommodating cavity; the center of the pressure plate is provided with a push plate guide hole which can be used for the push plate to move in and play a guide role;

the expansion sleeve is sleeved on the periphery of the clamp boss and comprises an annular base body and a plurality of expansion sheets uniformly distributed on the circumference, the inner side of the top of each expansion sheet forms an expansion sheet conical surface section matched with the conical surface section of the clamp boss, and the distance between the inner surface of the expansion sheet conical surface section and the axis of the expansion sleeve is gradually enlarged from the top end of the expansion sheet to the inside;

the positioning disc is provided with an accommodating cavity forming a step hole and a through hole, the accommodating cavity is used for accommodating the annular substrate of the expansion sleeve and providing a transverse displacement space and a limit, and the through hole is used for passing through the expansion sheet of the expansion sleeve;

each rotary pull rod comprises a middle section positioned in the middle, the outer wall of the middle section is provided with a guide groove, the guide groove consists of three sections, namely an end groove positioned at two ends and a middle spiral groove positioned in the middle, the length directions of the two end grooves are parallel to the axis of the rotary pull rod, and a vertical connecting line between the length directions of the two end grooves and the axis of the rotary pull rod is ninety degrees;

the clamp boss is provided with a guide screw corresponding to each rotary pull rod through hole; the guide screw comprises a guide section which extends into the rotary pull rod through hole and is embedded into the guide groove of the middle section of the rotary pull rod.

Preferably, the length of the connecting post is greater than the length of the connecting post through hole;

preferably, the bottom of the accommodating cavity is also circumferentially and uniformly provided with three spring accommodating grooves; the disc surface of the pressure plate corresponding to the cavity bottom of the accommodating cavity is also provided with three spring accommodating grooves on the circumference, and the three spring accommodating grooves correspond to the spring accommodating grooves of the cavity bottom of the accommodating cavity one by one, and each pair of spring accommodating grooves is provided with a spring;

preferably, the spring is a flat section rectangular spring.

Preferably, two ends of the connecting column are respectively propped against and fixedly connected with the annular matrix of the pressure plate and the expansion sleeve;

preferably, each rotary pull rod through hole corresponds to one connecting column through hole, and the axes of the rotary pull rod through holes and the boss through hole are parallel and positioned in the same radial direction;

preferably, the axis of the guide section perpendicularly intersects with the axis of the rotary pull rod passing hole.

Preferably, a blind rivet mounting hole for penetrating through the blind rivet is formed in the center of the push plate, one end of the blind rivet is fixedly connected with the push plate by adopting a nut, the other end of the blind rivet is connected with a corresponding power transmission component of the machine tool, and the power transmission component drives the blind rivet to transversely reciprocate;

preferably, the pushing disc is also provided with an annular limiting round table, the aperture of a pushing disc guide hole of the pressing disc is smaller than the diameter of the annular limiting round table of the pushing disc, and the pushing stroke of the pushing disc can be limited;

preferably, the outer periphery of the annular matrix of the expansion sleeve is also provided with a containing groove for installing an O-shaped ring, so that the annular matrix of the expansion sleeve is in contact sealing with the inner wall of the containing cavity of the positioning disc;

preferably, the pressing block is also provided with a pressing convex part;

preferably, the fixture further comprises a gas channel, wherein the gas channel comprises a first gas channel which is respectively arranged on the transition connecting disc, a second gas channel which is arranged on the fixture body, a third gas channel which is arranged on the positioning disc is connected, an inlet of the third gas channel of the positioning disc is positioned at a position, close to the passing hole, of the top end of the positioning disc, when the workpiece is clamped, the workpiece is opposite to the side face of the workpiece, and if the clamping position of the workpiece is correct, the inlet can be blocked by the side face of the workpiece.

Compared with the prior art, the invention has the following advantages:

the clamp has the functions of slight expansion, automatic centering expansion and end face clamping, and can also have the function of detecting whether the clamping position of the workpiece is correct. The processing efficiency and the processing quality are greatly improved, and the clamp is convenient and quick to operate; the method is not only convenient for grooving the thin-wall part, but also particularly for machining the hot workpiece, and has outstanding advantages for guaranteeing the quality. And is applicable not only to thin-walled workpieces but also to non-thin-walled workpieces.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute an undue limitation on the invention. In the drawings:

FIG. 1 is a schematic view of the structure of a synchronizer gear sleeve workpiece;

FIG. 2 is a schematic front view of the present vehicle clamp;

FIG. 3 is a schematic cross-sectional view of K-K shown in FIG. 2;

fig. 4, 5 and 6 are a front view, an axial sectional view and a K-K sectional view of the transition joint disc 3, respectively;

fig. 7, 8 and 9 are a front view (a partial enlarged view denoted by K), a P-direction view and a sectional view of the jig body 5, respectively;

fig. 10 is a schematic view of the structure of the guide screw 14;

fig. 11 and 12 are front and cross-sectional views, respectively, of push plate 22;

fig. 13 and 14 are front and cross-sectional views, respectively, of the platen 19;

fig. 15 and 16 are front and cross-sectional views, respectively, of the tension sleeve 10;

fig. 17 and 18 are a front view and a cross-sectional view, respectively, of the puck 9;

fig. 19, 20 and 21 are a front view, a K-K cross-sectional view, and an expanded schematic view of a guide groove thereon, respectively, of the rotary tie rod 13;

FIG. 22 is a cross-sectional view of the connecting post 12;

FIG. 23 is a cross-sectional view of compact 18;

reference numerals illustrate:

1. pulling nails; 2. a nut; 3. a transition connecting disc; 4. an O-ring; 5. a clamp body; 6. an inner hexagon screw; 7. an O-ring; 8. an inner hexagon screw; 9. a positioning plate; 10. expanding sleeve; 11. a hexagon socket head cap screw; 12. a connecting column; 13. rotating the pull rod; 14. a guide screw; 15. a nut; 16. a cotter pin; 17. a hexagonal thin nut; 18. briquetting; 19. a pressure plate; 20. an inner hexagon screw; 21. a spring; 22. pushing the disc; 23. an O-ring; 24. a guide screw;

Detailed Description

It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.

The invention will be described in detail below with reference to the drawings in connection with embodiments.

As shown in fig. 2 and 3, the clamp mainly comprises a transition connecting disc 3, a clamp body 5, a positioning disc 9, an expansion sleeve 10, a connecting column 12, three rotary pull rods 13, a pressing block 18, a pressing disc 19, a spring 21, a pushing disc 22 and a guide screw 24.

As shown in fig. 4, 5 and 6, the transition connecting disc 3 is used for realizing transition connection between a machine tool and the fixture body 5, the transition connecting disc 3 comprises a disc-shaped body 31, and a through hole 32 for the blind rivet 1 to pass through is formed at the axis of the body 31; the body 31 is also provided with three connecting disc counter bores 33 and three fixture body connecting threaded holes 34 which are uniformly distributed on the circumference; the connecting disc counter bore 33 is used for fixedly connecting the transition connecting disc with a corresponding part of the machine tool by bolts, and the clamp body connecting threaded hole 34 is used for fixedly connecting the transition connecting disc 3 with the clamp body 5 by bolts.

As shown in fig. 7, 8 and 9, the clamp body 5 includes a disc-shaped clamp body 51 and a clamp boss 52 which are coaxial, the clamp body 51 is provided with a receiving cavity 510, the center of the clamp boss 52 is provided with a boss through hole 521, three rotary pull rod through holes 522 are uniformly distributed around the boss through hole 521, and three connecting column through holes 511 which are communicated with the receiving cavity 510 are uniformly distributed around the clamp body 51 around the clamp boss 52; preferably, each rotary pull rod through hole 522 corresponds to one connecting column through hole 511, and the axes of the rotary pull rod through holes and the boss through holes 521 are parallel and positioned in the same radial direction; three spring accommodating grooves 512 are uniformly distributed on the circumference of the bottom of the accommodating cavity 510; the threaded hole 513 is used for fixedly connecting the clamp body and the positioning disk 9 by bolts;

the top outer side of the clamp boss 52 forms a tapered surface section 523, and the tapered surface section 523 gradually expands in diameter from the top end to the rear;

the clamp boss 52 is also provided with a guide screw mounting hole 53 corresponding to each rotary pull rod through hole 522, and the guide screw mounting holes 53 are used for mounting the guide screws 14; as shown in fig. 10, the guide screw 14 includes a threaded section 141 and a guide section 142, wherein the guide section 142 extends into the rotary pull rod passage aperture 522; preferably, the axis of the guide section 142 perpendicularly intersects the axis of the rotary pull rod passage aperture 522.

As shown in fig. 3, the push plate 22 is positioned in the accommodating cavity 510 of the fixture body 5, as shown in fig. 11 and 12, a blind rivet mounting hole 221 for penetrating the blind rivet 1 is formed in the center of the push plate 22, one end of the blind rivet is fixedly connected with the push plate 22 by adopting a nut 2, the other end of the blind rivet 1 is connected with a corresponding power transmission component of a machine tool, and the power transmission component drives the blind rivet to do transverse reciprocating motion; the pushing disc 22 is also provided with three rotary pull rod mounting holes 222 on the circumference; the push disc 22 is also provided with an annular limiting round table 223;

as shown in fig. 3, the platen 19 is also located in the accommodating chamber 510 of the chuck body 5, and the platen 19 is interposed between the pusher plate 22 and the bottom of the accommodating chamber 510; as shown in fig. 13 and 14, the center of the pressing plate 19 is provided with a pushing plate guiding hole 191 which can move and guide the pushing plate 22 therein, and the diameter of the pushing plate 22 is smaller than that of the annular limiting round table 223 to form the limit of the pushing stroke of the pushing plate 22; the disc surface of the pressure plate 19 corresponding to the bottom of the accommodating cavity 510 is also provided with three spring accommodating grooves 193 on the circumference, and corresponds to the spring accommodating grooves 512 on the bottom of the accommodating cavity 510 one by one, each pair is provided with a spring 21, preferably, each pair is a flat section rectangular spring (coil spring), the flat section rectangular spring plays a role of slight expansion, the springs with proper size specification are selected through calculation, the L16X 25 JB/T3 circumferences are uniformly distributed, the compression deformation amount of 2mm is axially reserved, the slight expansion can be met, the minimum loss of centering precision of the workpiece can be ensured, and the accurate centering effect of the thin-wall part is achieved.

The circumference of the pressure plate 19 is also provided with three counter bores 192, each of which is used for penetrating bolts to be fixedly connected with one end of a connecting column 12, as shown in fig. 3;

as shown in fig. 3, the expansion sleeve 10 is sleeved on the periphery of the clamp boss 52; as shown in fig. 15 and 16, the expansion sleeve 10 includes an annular base 101 and a plurality of expansion pieces 102 uniformly distributed circumferentially, wherein an expansion piece conical surface section 1021 matching with the conical surface section 523 of the clamp boss 52 is formed on the top inner side of each expansion piece 102, and the distance between the inner surface of the expansion piece conical surface section 1021 and the axis of the expansion sleeve 10 is gradually enlarged inwards from the top end of the expansion piece, so that when the expansion sleeve moves towards the clamp body 51 in a propping manner, the expansion piece 102 expands outwards due to the propping of the expansion piece conical surface section 1021 and the conical surface section 523 of the clamp boss 52, and when the expansion sleeve moves away from the clamp body 51, the expansion piece 102 gradually folds inwards to return until the expansion piece conical surface section 1021 and the conical surface section 523 of the clamp boss 52 are out of contact.

In addition, the annular base body 101 of the expansion sleeve 10 is also provided with three mounting counter bores 1011 on the circumference, each for penetrating through a bolt to be fixedly connected with the other end of a connecting column 12 by threads, as shown in fig. 3; as shown in fig. 22, the axis of the connecting post 12 is provided with an internal threaded hole 120 for threaded connection of two ends, and the length of the connecting post 12 is longer than the length of the connecting post passing hole 511 of the fixture body 5, and two ends of the connecting post respectively abut against the annular base body 101 fixedly connected with the pressure plate 19 and the expansion sleeve 10, so that a travel space for transversely moving the connecting post 12 along the axis line of the connecting post passing hole 511 of the fixture body 5 is reserved and the travel is correspondingly limited.

The outer periphery of the annular base body 101 of the expansion sleeve 10 is also provided with a containing groove 1012 for installing an O-shaped ring, so that the annular base body 101 of the expansion sleeve 10 is in contact sealing with the inner wall of the containing cavity 91 of the positioning disk 9;

as shown in fig. 3, 17 and 18, the positioning disk 9 is fixedly connected with the fixture body 5 through threaded connection of a counter bore 93 formed by a bolt penetrating through the positioning disk 9 and a threaded hole 513 of the fixture body 5; the positioning plate is provided with a containing cavity 91 and a passing hole 92 which form a step hole, the containing cavity 91 is used for containing the annular base body 101 of the expansion sleeve 10 and providing a transverse displacement space and a limit, and the passing hole 92 is used for passing the expansion sheet 102 of the expansion sleeve 10;

as shown in fig. 19, 20 and 21, the rotary pull rod 13 includes a middle section 133 located in the middle, shaft sections 134 located at two sides, a press block mounting section 132, and thread sections (135, 131) at two ends, the shaft sections 134 are penetrated in a rotary pull rod mounting hole 222 of the push disc 22, the diameter of the shaft sections 134 is smaller than that of the middle section 133, a junction between the two sections forms a limit step and the rotary pull rod mounting hole 222 forms a limit of one end, and the other end forms a limit by screwing a nut on the thread section 135, so that the rotary pull rod 13 is axially fixed relative to the push disc 22 but can rotate around the axis of the rotary pull rod; the press block mounting section 132 is a conical surface section, corresponds to a mounting conical hole 181 of the 18 press block shown in fig. 23, forms one end limit, forms limit after the screw thread section 131 is screwed with a nut at the other end, and the press block 18 is also provided with a press convex part 182;

the outer wall of the middle section 133 of the rotary pull rod 13 is provided with a guide groove, the guide groove consists of three sections of end grooves (1331 and 1332) at two ends and a middle spiral groove 1332 in the middle, the length directions of the two end grooves (1331 and 1332) are parallel to the axis of the rotary pull rod 13, and a perpendicular connecting line between the length directions of the two end grooves (1331 and 1332) and the axis of the rotary pull rod 13 is ninety degrees.

The guide section 142 of the guide screw 14 engages in the guide groove of the intermediate section 133 of the rotary pull rod 13.

In the aspect of workpiece compaction: the right end part of the three rotary pull rods 13 is provided with three pressing blocks 18, the left end part is connected with a push disc 22, and the push disc 22 is pulled by a machine tool hydraulic power source (a clamping oil cylinder) to drive the three rotary pull rods connected with the push disc 22 to axially move, so that the three pressing blocks 18 are driven to press the end face of a workpiece, and the deformation of the workpiece caused by turning force is effectively overcome. It should be noted that, the cylindrical surfaces of the three pull rods are designed with guide grooves which are similar to spiral ascending structures (middle spiral grooves 1332), end grooves (1331 and 1332) at two ends of each guide groove are provided with 3mm straight strokes in the axial direction, the axial length of each guide groove on the 90-degree corner is 9.8mm, and the structure of each guide groove enables pressing blocks connected with the pull rods to have the functions of pressing and withdrawing workpieces and rotating 90 degrees.

The working principle is as follows: the pushing disc moves rightwards to eliminate the gap, then the pressing disc 19 is pushed by continuing to move rightwards, the connecting column 12 is pushed by the compression spring 21, the expansion sleeve 10 is driven to move rightwards, the expansion piece is contracted inwards to loosen the workpiece, meanwhile, in the process of moving the pushing disc rightwards by 12mm, the three rotary pull rods move rightwards and rotate clockwise by 90 degrees under the cooperation of the guide screw 14 and the guide groove, the pressing block is withdrawn from the workpiece, and the original state of loading the workpiece is restored; at the moment, the workpiece is clamped on the expansion sleeve, when the pushing disc moves leftwards, under the action of the restoring force of the spring, the expansion sheet of the expansion sleeve 10 slightly expands to clamp the workpiece, and meanwhile, the pressing block rotates anticlockwise and moves leftwards to press the workpiece. The clamp realizes centering of the workpiece through the process, and the end face is tightly pressed.

Furthermore, in order to avoid waste products generated by the workpiece pad scraps, an airtight detection system is further added: the gas channel comprises a first gas channel 35 which is respectively arranged on the transition connecting disc 3, a second gas channel 514 which is arranged on the clamp body 51, a third gas channel 94 which is arranged on the positioning disc 9 is connected, an inlet of the third gas channel 94 of the positioning disc 9 is positioned at a position, close to the through hole 92, of the top end of the positioning disc, when a workpiece is clamped, the workpiece is opposite to the side face of the workpiece, and if the clamping position of the workpiece is correct, the inlet can be blocked by the side face of the workpiece.

And if the inlet is plugged, the detection result of the airtight detection system is that the workpiece positioning surface meets the requirement, and at the moment, the machine tool performs machining again. Otherwise, the air detection system sends out a signal to inform the machine tool to stop starting. The fixture is matched with an automatic matching structure, comprises a mechanical arm for automatic loading and unloading, and can realize automatic processing. Under the condition of ensuring the air detection measure, the product quality is ensured, and the efficiency is greatly improved.

The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A high accuracy synchronous ware ring gear hot post-processing turning groove anchor clamps, its characterized in that: the clamp mainly comprises a transition connecting disc, a clamp body, a positioning disc, an expansion sleeve, a connecting column, three rotary pull rods, a pressing block, a pressure plate, a spring, a pushing disc and a guide screw;

a guide screw mounting hole is formed in the clamp boss corresponding to each rotary pull rod through hole, and the guide screw mounting holes are used for mounting guide screws; the guide screw comprises a guide section which extends into the rotary pull rod through hole and is embedded into the guide groove of the middle section of the rotary pull rod,

the length of the connecting column is longer than the length of the connecting column through hole,

three spring accommodating grooves are uniformly distributed at the bottom of the accommodating cavity; the disc surface of the pressure plate corresponding to the cavity bottom of the accommodating cavity is also provided with three spring accommodating grooves on the circumference, and the three spring accommodating grooves correspond to the spring accommodating grooves of the cavity bottom of the accommodating cavity one by one, and each pair of spring accommodating grooves is respectively provided with a spring.

2. The high-precision synchronizer gear ring hot post-processing grooving clamp according to claim 1, wherein: the spring is a flat section rectangular spring.

3. The high-precision synchronizer gear ring hot post-processing grooving clamp according to claim 1, wherein: each rotary pull rod through hole corresponds to one connecting column through hole, and the axes of the rotary pull rod through holes and the boss through hole axes are parallel and positioned in the same radial direction.

4. The high-precision synchronizer gear ring hot post-processing grooving clamp according to claim 1, wherein: the center of the push disc is provided with a blind rivet mounting hole for penetrating through the blind rivet, one end of the blind rivet is fixedly connected with the push disc by adopting a nut, the other end of the blind rivet is connected with a corresponding power transmission part of the machine tool, and the power transmission part drives the blind rivet to do transverse reciprocating motion.

5. The high-precision synchronizer gear ring hot post-processing grooving clamp according to claim 1, wherein: the pushing disc is also provided with an annular limiting round table, the aperture of a pushing disc guide hole of the pressing disc is smaller than the diameter of the annular limiting round table of the pushing disc, and the pushing disc pushing stroke can be limited.

6. The high-precision synchronizer gear ring hot post-processing grooving clamp according to claim 1, wherein: the outer periphery of the annular matrix of the expansion sleeve is also provided with a containing groove for installing an O-shaped ring, so that the annular matrix of the expansion sleeve is in contact seal with the inner wall of the containing cavity of the positioning disc.

7. The high-precision synchronizer gear ring hot post-processing grooving clamp according to claim 1, wherein: the axis of the guide section is perpendicularly intersected with the axis of the rotary pull rod through hole.

8. The high-precision synchronizer gear ring hot post-processing grooving clamp according to claim 1, wherein: the gas channel comprises a first gas channel which is respectively arranged on the transition connecting disc, a second gas channel which is arranged on the clamp body, a third gas channel which is arranged on the positioning disc is connected, an inlet of the third gas channel of the positioning disc is positioned at a position close to the passing hole of the top end of the positioning disc, when the workpiece is clamped, the workpiece is opposite to the side face of the workpiece, and if the clamping position of the workpiece is correct, the inlet can be blocked by the side face of the workpiece.