CN214442412U - Forming die of aluminum alloy component - Google Patents

Abstract

The utility model provides a forming die of aluminum alloy component for take the aluminum alloy component of doghouse, forming die include mould main part and one or more be used for with the shrinkage pool of aluminum alloy component's doghouse matching, the mould main part includes the mould main part shaping face of downward concave yield, sets up mould main part shaping face outlying roof and be used for supporting the bearing structure of mould main part shaping face and roof, bearing structure includes vertical setting at the curb plate of mould main part peripheral position and the cardboard that is used for connecting each curb plate, is provided with the fretwork hole that is used for lightening mould weight on curb plate and cardboard, the shrinkage pool is for certainly the hole site structure of mould main part shaping face downward concave yield. The utility model has the advantages of high forming precision, good process repeatability, low residual stress, good dimensional stability and the like. The utility model discloses a high-efficient shape nature integration of large-scale area convex hole top cap is made and the ageing strengthening effect, has shortened manufacturing cycle.

Description

Forming die of aluminum alloy component

Technical Field

The utility model belongs to the shaping field of aluminum alloy component, concretely relates to aluminum alloy component's forming die.

Background

The creep age forming technology is a technology which is generated for solving the difficult problem of high-performance and high-precision manufacturing of large-scale complex integral components in aerospace. The technology utilizes the creep and time effect strengthening characteristics of the material under the action of a stress field and a temperature field, enables a workpiece to be attached to the molded surface of a die in a vacuum loading mode without a convex die or a mechanical loading mode with the convex die, and keeps the material in a constant temperature state for a certain time to enable the material to generate plastic flow so as to realize the forming and forming cooperative manufacturing of the component.

The creep age forming technology not only can realize the integrated forming of large components, but also can greatly improve the mechanical property of materials. Compared with the traditional integral wallboard component forming technology, the technology has the advantages of high forming precision, good dimensional stability, difficulty in generating processing cracks and the like.

With the rapid development of modern aviation industry, the performance requirements of aerospace components continuously tend to high reliability, high stability, long service life and light weight, and research on creep age forming of large-scale complex integral components and component production strength are increased by domestic and foreign scientific research institutions and processing enterprises.

The large-scale top cover with the convex hole and the small flanging hole at the periphery is a main structure component of an aerospace carrier rocket fuel storage tank, the traditional forming method of the component is stamping forming, the method has the problems of low forming precision, long processing period and the like, and the flanging forming of the convex hole further influences the overall shape precision of the top cover component because the flanging process of the convex hole is positioned after the stamping process of the component main body, and the final size precision of the component can be influenced because of large residual stress in the component after the component is formed.

Therefore, there is a need in the art for a new forming die for aluminum alloy structural members and a forming method thereof to solve the above problems.

SUMMERY OF THE UTILITY MODEL

The utility model discloses utilize the creep and the ageing strengthening characteristic of material, use one set of device of inlaying the formula to form the large-scale component of taking the dogleg of multiple different dimensions to realize that the taking dogleg that takes shape and obtain shape size precision is high, processing cycle is short, low in production cost characteristics.

The utility model discloses at first provide a take forming die of aluminum alloy component of dogging, forming die includes mould main part, inlays ring and lug bolt, the mould main part includes the mould main part shaping face of downward concave yield, sets up mould main part shaping face outlying roof, positioning element A, ring channel and be used for supporting the bearing structure of mould main part shaping face and roof, the ring channel sets up from the upper surface downward concave yield of mould main part shaping face, just the ring channel is used for inlay the ring and inlay the setting wherein, positioning element A sets up the structure of at least certain position radial protrusion or concave yield on the inner ring of ring channel or outer loop in order to be used for fixing a position inlaying the ring, inlay the ring including inlay the ring shaping face, with one or more shrinkage pools that the dogging of aluminum alloy component's dogging matches, set up at least certain position and radial concave yield or protrusion on the inner ring of inlaying ring or outer loop and be used for with positioning element A matches and decides The positioning part B is arranged on the forming surface of the embedding ring, and a first threaded hole is formed in the forming surface of the embedding ring and used for screwing a lifting lug bolt; at least comprises a forming surface of the die body and a forming surface of the insert ring which jointly form a die profile of the forming die.

In a specific embodiment, the positioning component a (15) is a positioning block, the positioning block is arranged at the lower part of the annular groove (16) and used for positioning the embedded ring (4), the positioning component B (43) is a positioning groove, and the positioning groove is arranged at the lower part of the embedded ring (4) and used for matching and positioning with the positioning block.

In a specific embodiment, the positioning block (15) is a V-shaped positioning block, and the positioning groove (43) is a V-shaped positioning groove.

In a specific embodiment, the first threaded holes (44) are more than three and uniformly distributed on the embedded ring (4) in the circumferential direction, and each threaded hole is preferably arranged at the same distance from the inner ring and the outer ring of the embedded ring.

In a specific embodiment, the annular groove (16) is a sunken groove structure arranged on the die body, and the concave hole (42) is a through hole structure arranged on the embedded ring (4); a gap exists between the die main body (1) and the embedding ring (4), the matching system is in clearance fit, and the preferred matching gap is smaller than 1 mm.

In a specific embodiment, the supporting structure comprises side plates (13) vertically arranged at the peripheral position of the mould main body and a clamping plate (18) used for connecting each side plate, and hollow holes (20) used for reducing the weight of the mould are arranged on the side plates and the clamping plate.

In a specific embodiment, the positioning component A (15) is more than two arranged at different positions of the circumferential direction of the annular groove (16), the positioning component B (43) is more than two arranged at different positions of the circumferential direction of the embedded ring (4), and preferably, the plurality of positioning components A (15) and the plurality of positioning components B (43) are all uniformly arranged in the circumferential direction.

In a specific embodiment, the forming die further comprises an insert (2) matched with one or more concave holes (42), and a positioning part C (45) is radially arranged on at least one position of one concave hole in a protruding or concave mode, the insert (2) comprises an insert forming surface (21), a positioning part D (22) which is radially arranged on one position of the insert in a protruding or concave mode and used for matching and positioning with the positioning part C (45), and a second threaded hole (23) which is arranged on the insert forming surface (21) and used for screwing in the lug bolt (6); the forming surface (11) of the die main body, the forming surface (41) of the insert ring and the insert forming surface (21) of the partial insert jointly form a die surface (3) of the forming die.

In a specific embodiment, the positioning component C (45) is a V-shaped block, the V-shaped block is arranged at the lower position of the concave hole, and the positioning component D (22) is a V-shaped groove, and the V-shaped groove is arranged at the lower position of the insert.

In a specific embodiment, the second threaded hole (23) is arranged at the center of the insert forming surface (21), the positioning parts C (45) are more than two arranged at different positions in the circumferential direction of the concave hole, the positioning parts D (22) are more than two arranged at different positions in the circumferential direction of the insert, and preferably, the plurality of positioning parts C (45) and the plurality of positioning parts D (22) are uniformly arranged in the circumferential direction; and a forming fillet (46) matched with the arc transition angle of the convex hole of the aluminum alloy member is also arranged at the concave hole (42) of the embedding ring (4), and an embedding block fillet (24) matched with the forming fillet (46) is arranged between the side surface of the embedding block (2) and the embedding block forming surface (21).

The utility model also provides a forming die of the aluminum alloy component, which is used for forming the aluminum alloy component with the convex hole, characterized in that the forming die comprises a die body (1) and one or more recessed holes (42) for matching with the protruding holes of the aluminum alloy member, the mould body (1) comprises a mould body forming surface (11) which is concave downwards, a top plate (12) which is arranged at the periphery of the mould body forming surface (11) and a supporting structure which is used for supporting the mould body forming surface (11) and the top plate (12), the supporting structure comprises side plates (13) vertically arranged at the peripheral position of the mould main body and clamping plates (18) used for connecting the side plates, the side plates and the clamping plates are provided with hollowed holes (20) for reducing the weight of the mold, and the concave holes (42) are hole site structures which are recessed downwards from the forming surface (11) of the mold main body.

In a specific embodiment, the forming die further comprises a positioning column (17) which is arranged on the top plate (12) and used for positioning the aluminum alloy sheet.

In a specific embodiment, the positioning column (17) is fixed on the top plate in a welding mode.

In a specific embodiment, the positioning column (17) comprises more than two circumferential different positions arranged on the radial outer side of the forming surface (11) of the die main body.

In a specific embodiment, the positioning column (17) comprises two oppositely arranged positioning columns.

In a specific embodiment, the forming die further comprises a bottom plate (19) fixedly connected to the lower position of the side plate (13), and the bottom plate (19) is also provided with a hollow hole (20) for reducing the weight of the die.

In a specific embodiment, the forming die further comprises a cushion block (14) which is arranged on the lower side of the bottom plate (19) and is used for increasing the contact area of the die bottom plate and air so as to improve the heat transfer and ventilation rate of the die and increase the uniformity of the heat distribution of the die.

In a specific embodiment, the upper part of the concave hole (42) is provided with a formed fillet (46) used for matching with the arc transition angle of the convex hole on the aluminum alloy component.

In a particular embodiment, the top plate (12) is a horizontally disposed plate.

In a specific embodiment, forming die is still including inlaying ring (4), insert (2) and lug bolt (6), the shrinkage pool all sets up on inlaying ring (4) and the number of shrinkage pool be four or more, mould main part (1) still includes locating part A (15) and ring channel (16), ring channel (16) set up from the upper surface undercut of mould main part shaping surface (11), just ring channel (16) are used for inlaying ring (4) and inlaying the setting wherein, locating part A (15) set up to be used for to inlaying ring (4) location for the radial protrusion of certain position or the structure of recess at least on the inner ring of ring channel or outer loop, inlay ring (4) including inlaying ring shaping surface (41), shrinkage pool (42), set up at least certain position and radial recess or protrusion on the inner ring of inlaying ring (4) or outer loop and be used for with locating part A (15) matches the location of location A component B (43) and a first threaded hole (44) which is arranged on the embedding ring forming surface (41) and is used for screwing a lifting lug bolt (6); the insert (2) is matched with the concave holes, a positioning part C (45) is radially arranged at a certain position of at least one concave hole in a protruding or concave mode, the insert (2) comprises an insert forming surface (21), a positioning part D (22) which is radially arranged at a certain position of the insert in a protruding or concave mode and used for being matched and positioned with the positioning part C (45), and a second threaded hole (23) which is arranged on the insert forming surface (21) and used for being screwed into a lug bolt (6); the forming surface (11) of the die main body, the forming surface (41) of the insert ring and the insert forming surface (21) of the partial insert jointly form a die surface (3) of the forming die.

Compared with the prior art, the utility model discloses at least, following effect has:

the utility model provides a pair of forming die of aluminum alloy component has adopted creep age forming process to replace traditional stamping forming process, has overcome and has taken the many scheduling problems of low, the manufacturing procedure of the traditional technology of convex hole top cap manufacturing accuracy, has that the shaping precision is high, and process repeatability is good, and residual stress is low, advantages such as dimensional stability is good. The utility model discloses a high-efficient shape nature integration of large-scale area convex hole top cap is made and the ageing strengthening effect, has shortened manufacturing cycle.

Drawings

In addition to the objects, features and advantages described above, there are other objects, features and advantages of the present invention which will be described in further detail below with reference to the accompanying drawings.

FIG. 1 is a schematic view of a creep age forming die for a large apertured top cover member;

FIG. 2 is a schematic view of a creep age forming die in another state;

FIG. 3 is an exploded view of a creep age forming die;

FIG. 4 is a cross-sectional view of a creep age forming die;

FIG. 5 is a schematic structural view of a mold body;

FIG. 6 is a schematic illustration of an insert;

FIG. 7 is a schematic view of a damascene ring;

wherein, 1-a mold body; 2-an insert; 3-molding surface of the mold; 4-embedding a ring; 6-a lug bolt; 11-the forming surface of the mould main body; 12-a top plate; 13-side plate; 14-a cushion block; 15-positioning part a; 16-an annular groove; 17-a positioning column; 18-a card board; 19-a base plate; 20-hollow holes; 21-insert forming face; 22-positioning means D; 23-a second threaded hole; 24-insert fillet; 41-insert ring forming surface; 42-concave holes; 43-positioning part B; 44-a first threaded hole; 45-positioning part C; 46-forming a fillet; 2.1-a first insert; 2.2-second insert; 2.3-third insert.

Detailed Description

The accompanying drawings, which form a part of the application of the present invention, are provided to provide a further understanding of the present invention, and the exemplary embodiments and descriptions thereof are provided to explain the present invention without making any undue restrictions on the present invention.

Referring to fig. 1 to 4, the present invention provides a device for creep age forming, including a die body 1, an embedded ring 4 embedded in an annular groove of the die body, an insert 2 embedded in the embedded ring, and a lug bolt 6.

Referring to fig. 5 to 7, the mold main body comprises a mold main body forming surface 11, a top plate 12 arranged on the periphery of the mold main body forming surface, a side plate 13 arranged on the periphery of the mold main body, a clamping plate 18 connected with the side plate, a bottom plate 19 at the bottom of the mold main body, and a cushion block 14 arranged below the bottom plate for increasing the heat transfer area of the bottom plate and improving the ventilation rate, wherein an annular groove 16 and two positioning blocks 15 which are symmetrically distributed in the annular groove for positioning are arranged in the mold main body forming surface, and two positioning columns 17 which are symmetrical to each other are welded above the top plate; the embedded ring comprises an embedded ring forming surface 41, through holes arranged in the embedded ring, four threaded holes with the same diameter, uniform distribution and the same distance with the inner diameter and the outer diameter of the embedded ring, and a V-shaped block arranged in the through holes; the insert comprises an insert forming surface 21, two uniform and symmetrical V-shaped grooves at the bottom of the insert, a threaded hole 23 arranged at the center of the insert, and an insert round angle 24 with a transition effect between the side surface and the forming surface of the insert.

The die body 1, the embedding ring 4 and the insert 2 are separate parts, the embedding ring 4 is placed in an annular groove 16 in the die body, and the insert is embedded in a through hole in the embedding ring. The molding surface 11 of the die body, the molding surface 41 of the insert ring and the molding surface 21 of the insert constitute a die surface 3.

In the embodiment, the positions of the insert 2 and the insert ring 4 are determined according to the positions and the sizes of the convex holes of the components, and the distance from the center point of the insert to the center position of the die is obtained by performing plane expansion calculation on the top cover component and the die profile, wherein the distance from the center point of the insert to the center position of the die is 450mm, and the width of the insert ring is 260 mm. The die body 1 and the embedding ring 4 are in clearance fit, the outer circle of the embedding ring is matched with the die body in a base hole mode, the inner circle of the embedding ring is matched with the die body in a base shaft mode, and the clearance between the inner circle of the embedding ring and the die body is smaller than 1 mm.

Referring to fig. 4, in order to realize uniform heat transfer of the mold, reduce the weight of the mold and the manufacturing cost of the mold, a plurality of vent holes are formed in the side plate, the clamping plate and the bottom plate, the total area of the vent holes of the side plate is larger than 60% of the total area of the side plate, the total area of the vent holes of the clamping plate is larger than 30% of the total area of the clamping plate, and the total area of the vent holes of the bottom plate is larger than 65% of the total area of the bottom plate.

Referring to fig. 7, the bottom of the embedded ring 4 is provided with two positioning grooves matched with the positioning blocks 15, the top of the concave hole 42 is provided with four forming fillets 46 with the radius equal to that of the transition fillet of the convex hole of the component, and the bottom of the embedded ring is provided with a chamfer, so that the embedded ring can smoothly enter the annular groove when being placed, the placing speed of the embedded ring is improved, and the chamfer size is C5.

In this embodiment, a large capping member with a convex hole is formed by a vacuum loading method, which includes the following specific steps:

step one, replacing the module: and screwing the lug bolt into a threaded hole in the insert 2.1 shown in the figure 1, and using external lifting force to act on the lug bolt to take away the insert 2.1, reserving the insert 2.2 and the insert 2.3 shown in the figure 1 and also reserving the insert ring 4, and taking away all the lug bolts in the figure 1 to obtain the creep age forming die with two die concave holes shown in the figure 2.

Step two, placing the plate: placing a circular plate with a large hole in the middle and two small holes in the periphery on the molded surface of a mold, adjusting the relative positions of the plate and the mold to ensure that the center point of the large hole in the middle of the plate is superposed with the projection of the center point of the main body of the mold on the horizontal plane, and ensuring that the projections of the two small holes in the periphery on the molded surface of the mold fall on the connecting line of the center point of the main body of the mold and the center point of the concave hole of the mold.

Thirdly, applying an external load: and integrally wrapping the component by using an air felt, covering the surface of the mold by using a vacuum bag, exhausting air in the bag after sealing is finished, maintaining the pressure for 5-20 minutes, gradually attaching the component to the molded surface of the mold, and enabling the convex hole of the component to fall into the concave hole of the mold.

Step four, creep aging stage: and pushing the component and the tooling thereof into the autoclave, and arranging thermocouples on the component and the tooling to detect the temperature condition of each area in the forming process. The creep age forming process comprises the following steps: keeping the air pressure in the tank at 1.5-2MPa, the aging temperature at 150-.

Step five, an unloading stage: and after the creep aging stage is finished, taking out the test component and the tooling thereof, removing the vacuum bag, unloading the vacuum pressure, and rebounding the component to obtain the top cover component with the convex hole, which meets the target profile precision.

The utility model discloses in, because of the size of first screw hole and second screw hole is little, and the existence of this screw hole can not influence the shaping precision of aluminum alloy component when creep age takes shape, and is corresponding M12 bolt is all chooseed for use for example to the lug bolt, and the diameter of bolt is 12mm promptly.

The utility model discloses in, inlay the ring and insert all can be according to the figure, size and the position of the protruding hole that the target component was taken and corresponding change.

Preferably, the die main body is in clearance fit with the embedding ring, and the clearance between the die main body and the embedding ring is less than 1mm, so that the embedding ring is convenient to replace, and the forming precision of the component is not influenced.

Preferably, the inner part of the mosaic ring is provided with four threaded holes with the same diameter and uniform distribution, and the distances between the threaded holes and the outer diameter of the mosaic ring are equal; the insert is characterized in that a threaded hole is formed in the center of the insert and used for connecting the lug bolt, when the insert ring or the insert is replaced, external lifting force acts on the lug bolt firstly, and then the lug bolt acts on the insert ring and the insert, so that the effect of convenient replacement is achieved.

Preferably, two symmetrical positioning blocks are arranged in the annular groove, the bottom of the embedding ring is provided with corresponding positioning grooves, and the positioning blocks are matched with the positioning grooves and used for positioning the embedding ring in the placing process and preventing the embedding ring from moving under the action of an external load in the using process so as to avoid the profile precision and the convex hole position precision error of the component.

Preferably, the top of the concave hole is provided with a forming fillet, when no insert is placed at the concave hole, the concave hole is a mold concave hole to accommodate the convex hole of the component, the transition position of the convex hole of the component and the molded surface of the component is in transition with a certain fillet, and the radius of the forming fillet is equal to the radius of the transition fillet of the convex hole of the component for realizing the forming precision of the convex hole of the component.

Preferably, two symmetrical V-shaped blocks are arranged in the concave hole, and a V-shaped groove matched with the V-shaped block is formed in the bottom of the insert, so that the insert is accurately positioned, and the insert is prevented from rotating in the creep age forming process.

Preferably, the bottom of the embedding ring is provided with a chamfer so that the embedding ring can smoothly enter the annular groove when the embedding ring is placed, and the placing speed of the embedding ring is improved.

Preferably, the side plates, the clamping plate and the bottom plate are all provided with vent holes so as to realize uniform heat transfer of the die, reduce the weight of the die and reduce the manufacturing cost of the die.

Preferably, an insert fillet is formed between the side surface of the insert and the insert forming surface, and the size of the fillet is consistent with that of a fillet formed in the insert ring and is also equal to the radius of a transition fillet of a convex hole of a component to be formed correspondingly.

Preferably, the bottom plate is provided with a cushion block at the lower side thereof so as to increase the contact area between the bottom plate of the mold and air, improve the heat transfer and ventilation rate of the mold, increase the heat distribution uniformity of the mold and improve the forming precision of the component.

The utility model discloses at first through inlaying ring (4) and setting up in ring channel (16) for different ring (4) of inlaying can correspond the different aluminum alloy component that takes shape. Furthermore, the utility model also arranges a plurality of concave holes (42) on the embedding ring (4) and arranges the embedding block (2) matched with the concave holes (42), so that each embedding ring (4) in the forming device of the utility model can correspondingly form a plurality of different aluminum alloy components; the cost savings of the forming die are further increased. Because the carrier rocket is a carrier space vehicle composed of multiple stages of rockets, each stage of rocket is provided with propellant storage tanks with different types, each propellant storage tank comprises a front bottom top cover and a rear bottom top cover, and parameters such as the number, the position, the size, the thickness and the like of convex holes on the front bottom top cover and the rear bottom top cover with different types are different, the cost of the mold is overhigh when each set of aluminum alloy component corresponds to one set of forming mold, and the forming cost of the aluminum alloy component is overhigh. Therefore, the utility model discloses in the forming die that provides can adapt to the shaping of the aluminum alloy component of different area bellmouths, therefore show and practice thrift the cost of formation.

Furthermore, the utility model discloses a computer simulation design to the mould and solved the position precision problem of component bulge.

The foregoing is a more detailed description of the invention, taken in conjunction with the specific preferred embodiments, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions and replacement, all should regard as belonging to the utility model discloses a protection scope.

Claims (10)

1. A forming die for an aluminum alloy structural member, for forming an aluminum alloy structural member with a male hole, characterized in that the forming die comprises a die body (1) and one or more recessed holes (42) for matching with the protruding holes of the aluminum alloy member, the mould body (1) comprises a mould body forming surface (11) which is concave downwards, a top plate (12) which is arranged at the periphery of the mould body forming surface (11) and a supporting structure which is used for supporting the mould body forming surface (11) and the top plate (12), the supporting structure comprises side plates (13) vertically arranged at the peripheral position of the mould main body and clamping plates (18) used for connecting the side plates, the side plates and the clamping plates are provided with hollowed holes (20) for reducing the weight of the mold, and the concave holes (42) are hole site structures which are recessed downwards from the forming surface (11) of the mold main body.

2. The forming die according to claim 1, further comprising positioning columns (17) provided on the top plate (12) and used for positioning the aluminum alloy sheet.

3. The forming die according to claim 2, characterized in that the positioning post (17) is welded and fixed on the top plate.

4. The forming die according to claim 2, wherein the positioning posts (17) are provided at two or more positions in a circumferential direction radially outside the die main body forming surface (11).

5. Forming die according to claim 4, characterised in that the positioning studs (17) comprise two oppositely arranged.

6. The forming die according to claim 1, characterized in that, the forming die further comprises a bottom plate (19) fixedly connected to the lower position of the side plate (13), and the bottom plate (19) is also provided with a hollow hole (20) for reducing the weight of the die.

7. The forming die of claim 6, further comprising a pad (14) disposed on the underside of the base plate (19) for increasing the contact area of the die base plate with air to increase the rate of die heat transfer and venting and increase the uniformity of die heat distribution.

8. The forming die according to claim 1, characterized in that the upper part of the concave hole (42) is provided with a forming fillet (46) for matching with the circular arc transition angle of the convex hole on the aluminum alloy member.

9. A forming die according to claim 1, characterized in that the top plate (12) is a horizontally arranged sheet material.

10. The forming die according to any one of claims 1 to 9, wherein the forming die further comprises an insert ring (4), an insert (2) and lug bolts (6), the recessed holes are provided on the insert ring (4) and the number of the recessed holes is four or more, the die main body (1) further comprises a positioning member a (15) and an annular groove (16), the annular groove (16) is recessed downward from the upper surface of the die main body forming surface (11), and the annular groove (16) is used for the insert ring (4) to be inserted therein, the positioning member a (15) is provided in a structure that is radially protruded or recessed at least at a certain position on the inner ring or the outer ring of the annular groove so as to position the insert ring (4), the insert ring (4) comprises an insert ring forming surface (41), a recessed hole (42), and is provided at least a certain position on the inner ring or the outer ring of the insert ring (4) and is radially recessed or protruded so as to be used for positioning the insert ring (4), and the insert ring (4) is provided at least a certain position on the inner ring or the outer ring of the insert ring (4) and is radially recessed or the recessed hole A positioning part B (43) which is matched and positioned with the positioning part A (15) and a first threaded hole (44) which is arranged on the embedding ring forming surface (41) and is used for screwing a lifting lug bolt (6); the insert (2) is matched with the concave holes, a positioning part C (45) is radially arranged at a certain position of at least one concave hole in a protruding or concave mode, the insert (2) comprises an insert forming surface (21), a positioning part D (22) which is radially arranged at a certain position of the insert in a protruding or concave mode and used for being matched and positioned with the positioning part C (45), and a second threaded hole (23) which is arranged on the insert forming surface (21) and used for being screwed into a lug bolt (6); the forming surface (11) of the die main body, the forming surface (41) of the insert ring and the insert forming surface (21) of the partial insert jointly form a die surface (3) of the forming die.

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