CN112474980B

CN112474980B - Uniform heating spinning device and spinning method for end socket piece

Info

Publication number: CN112474980B
Application number: CN202011243868.6A
Authority: CN
Inventors: 朱利军; 孙家鑫; 李新和
Original assignee: Changsha Super Spin Machinery Technology Co ltd
Current assignee: Changsha Super Spin Machinery Technology Co ltd
Priority date: 2020-11-10
Filing date: 2020-11-10
Publication date: 2022-12-27
Anticipated expiration: 2040-11-10
Also published as: CN112474980A

Abstract

The invention discloses a uniform heating spinning device and a spinning method of a head part, wherein the spinning device comprises a spinning support and a pressing plate, the pressing plate is used for fixing a workpiece to be formed at an opening at the upper end of the spinning support, the spinning device also comprises a workpiece bottom supporting part, a heating assembly and a telescopic supporting and resetting assembly, the workpiece bottom supporting part can be arranged in an inner cavity of the spinning support in a vertically movable manner, the heating assembly is fixedly connected to the lower end of the workpiece bottom supporting part, the telescopic supporting and resetting assembly is arranged in the spinning support, and the telescopic supporting and resetting assembly is connected with the workpiece bottom supporting part so as to provide upward supporting force for the workpiece bottom supporting part when the workpiece is formed and reset the workpiece bottom supporting part and the heating assembly after the workpiece is taken out. The spinning device and the spinning method have the advantages that the heating temperature of the deformation part of the workpiece is uniform and stable in the forming process of the workpiece, and the sinking phenomenon of the bottom of the workpiece can be effectively relieved.

Description

Uniform heating spinning device and spinning method for end socket piece

Technical Field

The invention relates to the technical field of workpiece spinning forming, in particular to a uniform heating spinning device and a spinning method for die-free spinning of a large thin-wall end socket piece.

Background

With the continuous development of the aerospace industry in China, the demand on large-scale end sockets is wider and wider, and the large-scale thin-wall end socket is used as a key component of a fuel storage tank and plays a key role in the capacity and strength of the fuel storage tank. The mechanical property of a forming workpiece welded by the traditional melon petal is always in an unstable state at a welding seam, and the traditional spinning method is very easy to generate the defects of local thinning, even processing fracture and the like.

Patent document CN201410570884.4, a large diameter-thickness ratio and large bow-height ratio end socket spinning forming device and a spinning method, and patent document CN201710394315.2, a large thin-wall end socket piece die-free spinning forming process, and provide an integral die-free spinning process and corresponding spinning machine tool equipment thereof. However, in the actual spinning process, as the shape of the end socket of the storage tank is more and more complex, heating spinning is often required in the forming process, the heating mode adopted by the existing end socket spinning is heating by flame and the like, and the specific implementation is that the local part of the end socket is heated by hand-held flame spraying. Because the flame temperature is high and the temperature difference is large, and manual operation is adopted, the method has the defects of obvious large heating temperature difference, nonuniform workpiece heating and local heating, a heating temperature band which can be borne by a plurality of materials in the spinning process is narrow, and the local heating by using the flame is easy to generate an overheating state, so that the forming precision and the mechanical property of a final formed part can be seriously influenced.

In addition, in the die-free spinning process of the workpiece, because the lower part of the workpiece is not provided with a die, the bottom of the workpiece sinks actually, namely the actual size depth of the bottom of the workpiece is larger than the theoretical depth, and the forming precision of the workpiece is also influenced.

Disclosure of Invention

The invention mainly aims to provide a uniform heating spinning device and a spinning method for a seal head piece.

In order to achieve the purpose, the invention provides a uniform heating spinning device of a head sealing piece, the spinning device comprises a spinning support and a pressing plate, the pressing plate is used for fixing a workpiece to be formed at an opening at the upper end of the spinning support, the spinning device further comprises a workpiece bottom supporting piece, a heating assembly and a telescopic supporting and resetting assembly, the workpiece bottom supporting piece is arranged in an inner cavity of the spinning support in a vertically movable mode, the heating assembly is fixedly connected to the lower end of the workpiece bottom supporting piece, the telescopic supporting and resetting assembly is installed in the spinning support, and the telescopic supporting and resetting assembly is connected with the workpiece bottom supporting piece so as to provide upward supporting force for the workpiece bottom supporting piece when the workpiece is formed and reset the workpiece bottom supporting piece and the heating assembly after the workpiece is taken out.

Further, the heating assembly comprises a support beam fixedly connected to the lower end of the workpiece bottom support, a mounting plate mounted on the support beam and surrounding the periphery of the workpiece bottom support, and a heating element mounted on the mounting plate.

Further, the mounting plate is horizontally arranged; the heating element is an electric heating element.

Further, the workpiece bottom support is an inverted first cylinder, the support beam is fixedly connected to the lower end of the first cylinder, and the height of the mounting plate and the height of the heating element are lower than the height of the upper edge of the first cylinder.

Furthermore, a plurality of circles of heating elements are arranged on the mounting plate, the plurality of circles of heating elements are arranged concentrically with the first cylinder body, and the diameters of the plurality of circles of heating elements are unequal.

Furthermore, a plurality of sliding rails are installed on the inner wall of the spinning support along the vertical direction, the number of the supporting beams is multiple, the end parts of the supporting beams are respectively installed on one sliding rail through a sliding block in a sliding mode, the sliding rails are evenly distributed along the circumferential direction of the inner wall of the spinning support, and the supporting beams are evenly distributed along the circumferential direction of the first cylinder.

Furthermore, the telescopic supporting reset assembly comprises a first spring, an inverted second barrel, a second spring and an inverted third barrel, the first barrel is sleeved outside the second barrel, the first spring is arranged between the first barrel and the second barrel, the second barrel is sleeved outside the third barrel, the second spring is arranged between the second barrel and the third barrel, and the bottom of the third barrel is fixedly installed on the bottom plate of the spinning support.

Further, the lower extreme of first barrel is equipped with the first limiting plate that is used for restricting the axial displacement of first barrel for the second barrel, and the lower extreme of second barrel is equipped with the second limiting plate that is used for restricting the axial displacement of second barrel for the third barrel.

Furthermore, a bottom layer heat insulation layer is arranged at the bottom of the inner cavity of the spinning support, and an annular heat insulation layer is arranged on the inner wall surface of the spinning support.

According to another aspect of the invention, a uniform heating spinning method for a head sealing piece is provided, the spinning method is used for spinning a workpiece to be formed by the spinning device, and the spinning method comprises the following steps:

s1: fixing the spinning device on a workbench of a spinning machine tool, fixing a workpiece to be formed on the upper end of a spinning support through the pressing plate, and enabling the upper surface of a supporting piece at the bottom of the workpiece to be in contact with the bottom surface of the workpiece to be formed;

s2: spinning a workpiece from the edge of a pressing plate to the center of the workpiece by a circle through a spinning wheel of a spinning machine tool, simultaneously starting a heating assembly to heat the workpiece, synchronously sinking a supporting piece at the bottom of the workpiece and the heating assembly together with the bottom of the workpiece in the spinning process, and forming a flexible support for the bottom of the workpiece by the rebound force of a telescopic supporting reset assembly;

s3: after the spinning of the workpiece is finished, the workpiece is taken down, and the supporting piece at the bottom of the workpiece and the heating assembly move upwards together under the action of the telescopic supporting reset assembly to reset.

Compared with the prior art, the invention has the following beneficial effects:

(1) Compared with the traditional spinning device with non-uniform flame heating temperature and uncontrollable temperature, the spinning device and the spinning method provided by the invention can control and uniform the temperature of the workpiece deformation part in the spinning process, the forming precision of the workpiece is high, the mechanical property is good, the performance of the workpiece can be considered in the forming process, and the shape cooperation is achieved.

(2) The lower part of the traditional processing method for the die-free spinning forming of the end socket is suspended, and the sinking phenomenon is easy to occur in the spinning process; in the spinning device and the spinning method, the bounce force provided by the mechanism consisting of the first cylinder and the telescopic supporting reset assembly to the bottom of the workpiece can effectively provide flexible support for spinning the workpiece, so that the phenomenon of sinking of the bottom of the workpiece is effectively relieved.

(3) The spinning device has the advantages of mature mechanism, simple principle, lower cost and strong engineering applicability.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic structural view of a spinning apparatus according to an embodiment of the present invention when a workpiece is ready to start spinning.

Fig. 2 is a schematic structural diagram of a spinning device according to an embodiment of the present invention after a workpiece is formed.

Fig. 3 is a partial enlarged view at I in fig. 2.

Fig. 4 is a partially enlarged view of fig. 2 at II.

Fig. 5 isbase:Sub>A schematic sectional view taken along the planebase:Sub>A-base:Sub>A in fig. 2.

Wherein the figures include the following reference numerals:

1. spinning a support; 2. pressing a plate; 3. a heating assembly; 4. a telescopically supported reset assembly; 5. a first cylinder; 6. a slide rail; 7. a slider; 8. a bottom layer heat insulation layer; 9. an annular heat insulation layer; 31. a support beam; 32. mounting a plate; 33. a heating element; 41. a first spring; 42. a second cylinder; 43. a second spring; 44. a third cylinder; 51. a first limit plate; 100. a workpiece; 421. a second limiting plate; 422. a first ear portion; 441. a second ear.

Detailed Description

In order to facilitate an understanding of the invention, the invention will be described more fully and in detail below with reference to the accompanying drawings and preferred embodiments, but the scope of the invention is not limited to the specific embodiments below. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the description and in the claims of the present application does not denote any order, quantity, or importance, but rather the intention is merely to distinguish one element from another. Also, the use of the terms a, an, etc. do not denote a limitation of quantity, but rather denote the presence of at least one. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships are changed accordingly.

Referring to fig. 1 to 5, a uniform heating spinning device for a capping piece according to an embodiment of the present invention is mainly suitable for the dieless spinning forming of a large thin-walled capping piece. As can be seen from the figure, the spinning device mainly comprises a spinning support 1, a pressure plate 2, a workpiece bottom supporting part, a heating component 3 and a telescopic supporting and resetting component 4. The spinning support 1 is cylindrical and used for placing a workpiece 100 to be formed, and the pressing plate 2 is used for fixing the workpiece 100 to be formed at an opening at the upper end of the spinning support 1; a workpiece bottom support is arranged at the center of the inner cavity of the spinning support 1 in a vertically movable manner, and the heating assembly 3 is fixedly connected to the lower end of the workpiece bottom support, which is used for supporting the bottom of the workpiece 100 when the workpiece 100 is spun and moves downwards along with the sinking of the workpiece 100 together with the heating assembly 3; a retractable support return assembly 4 is mounted in the interior cavity of the spinning support 1, the retractable support return assembly 4 being connected to the workpiece bottom support for providing upward support to the workpiece bottom support during the spinning of the workpiece 100 and for returning the workpiece bottom support and the heating assembly 3 together in an upward motion after the workpiece 100 is removed.

According to the uniform heating spinning device for the end sealing part, the workpiece bottom supporting part is arranged in the inner cavity of the spinning support 1, the heating component 3 is fixedly connected to the lower end of the workpiece bottom supporting part, the telescopic support resetting component 4 is arranged in the inner cavity of the spinning support 1, and the telescopic support resetting component 4 is connected with the workpiece bottom supporting part; when the workpiece 100 is spin-formed, a spinning wheel of a spin-forming machine moves from the edge of a pressure plate 2 to the center of the workpiece 100 along a spin-forming track, so that the workpiece 100 is gradually deformed from outside to inside for one circle, the workpiece 100 in deformation synchronously presses down a first cylinder 5, and along with the downward deformation of the workpiece 100, a workpiece bottom supporting member and a heating assembly 3 synchronously move downwards together, so that the heating assembly 3 and the deformed part of the workpiece 100 are always kept at a relatively constant distance, and the heating temperature is kept at a certain temperature relatively constantly, so that the forming precision and the mechanical property of the workpiece 100 are improved; in addition, in the spinning forming process of the workpiece 100, the telescopic support resetting component 4 and the workpiece bottom supporting member move up and down, which is equivalent to providing a flexible support for the bottom of the workpiece 100, so that the sinking of the bottom of the workpiece 100 can be resisted, and the sinking phenomenon in the spinning process of the workpiece 100 can be effectively relieved.

Specifically, in the present embodiment, the heating assembly 3 includes a support beam 31, a mounting plate 32, and a heating element 33. Wherein one end of the support beam 31 is fixedly connected to the lower end of the workpiece bottom support, the mounting plate 32 is fixedly mounted on the support beam 31, the mounting plate 32 surrounds the periphery of the workpiece bottom support, and the heating element 33 is fixedly mounted on the mounting plate 32. With this arrangement, the support beam 31, the mounting plate 32, and the heating element 33 can be integrally connected to the workpiece bottom support, and the distance between the heating element 33 and the deformed portion of the workpiece 100 can be kept relatively constant as the workpiece bottom support moves up and down together.

It should be noted that the mounting and connecting manner of the heating element 33 is not limited to the above-mentioned mounting manner by the support beam 31 and the mounting plate 32, and any mounting manner capable of achieving the same function in the prior art is possible.

In the present embodiment, the heating element 33 is an electric heating element. The electric heating element is mainly in a heat radiation heating mode, the heat quantity of heat radiation has a large relation with the distance, and the heating element 33 and the workpiece bottom supporting piece are fixedly connected into a whole, so that the deformation position of the workpiece 100 can always keep the same distance with the heating element 33, and the workpiece 100 can always keep constant temperature in the spinning deformation process.

Specifically, in the present embodiment, the workpiece bottom support is an inverted first cylinder 5, the support beam 31 is fixedly connected to the lower end of the first cylinder 5, the mounting plate 32 and the heating element 33 have a height lower than the height of the upper edge of the first cylinder 5, and a certain height difference is formed between the heating element 33 and the upper edge of the first cylinder 5. During the spin forming of the workpiece 100, the upper surface of the first cylinder 5 is always kept in contact with the bottom of the workpiece 100.

In the present embodiment, the mounting plate 32 is horizontally disposed, a plurality of circles of annular heating elements 33 are disposed on the mounting plate 32, the plurality of circles of heating elements 33 are concentrically disposed with respect to the first cylinder 5, and the diameters of the plurality of circles of heating elements 33 are unequal to form a plurality of sets of concentric circles, and the arrangement direction of the plurality of circles of heating elements 33 is the same as the annular spinning deformation direction of the spinning roller of the spinning machine. With this arrangement, the workpiece 100 can be always in a globally uniform heating state during the forming process, and the temperature of the deformed portion of the workpiece 100 can be constantly maintained at a certain temperature.

In this embodiment, install many slide rails 6 along vertical direction on the inner wall of spinning support 1, the quantity of supporting beam 31 is many, and the tip of many supporting beam 31 is respectively through 7 slidable mounting of a slider on a slide rail 6, and many slide rails 6 set up along the inner wall circumference equipartition of spinning support 1, and many supporting beam 31 set up along 5 circumference equipartitions of first barrel. By arranging the slide rails 6 in the vertical direction on the inner wall of the spinning support 1 and slidably mounting the support beam 31 on the slide rails 6 through the sliders 7, the stability of the workpiece bottom support in moving up and down together with the heating assembly 3 can be improved. Further, through setting up many slide rails 6 along the inner wall circumference equipartition of spinning support 1, set up many supporting beams 31 along 5 circumference equipartitions of first barrel, can further improve the stability when moving from top to bottom. An upper limit block is also provided at the upper end of the slide rail 6 for limiting the height of the support beam 31 moving upward along the slide rail 6.

Specifically, in this embodiment, the telescopically supported return assembly 4 basically comprises a first spring 41, an inverted second cylinder 42, a second spring 43 and an inverted third cylinder 44. The first cylinder 5 is sleeved outside the second cylinder 42, the first spring 41 is arranged between the first cylinder 5 and the second cylinder 42, the second cylinder 42 is sleeved outside the third cylinder 44, the second spring 43 is arranged between the second cylinder 42 and the third cylinder 44, and the bottom of the third cylinder 44 is fixedly mounted on the bottom plate of the spinning support 1.

With such an arrangement, in the spinning forming process of the workpiece 100, the first cylinder 5, the first spring 41, the second cylinder 42, the second spring 43 and the third cylinder 44 are integrally equivalent to a flexible support and act on the bottom of the workpiece 100, and when the workpiece 100 is spun to the bottom, the closer the spinning wheel is to the bottom of the workpiece 100, and the larger the deformation of the first spring 41 and the second spring 43 is, the larger the force of the flexible support is, the better the sinking of the bottom of the workpiece 100 can be resisted, so that the spinning device can effectively alleviate the sinking phenomenon in the spinning process of the workpiece 100.

In the present embodiment, the lower end of the first cylinder 5 is provided with a first stopper plate 51 for restricting the axial displacement of the first cylinder 5 with respect to the second cylinder 42; a second stopper plate 421 for restricting axial displacement of the second cylinder 42 with respect to the third cylinder 44 is provided at a lower end of the second cylinder 42. In this way, the stroke of the up-and-down movement of the first cylinder 5 and the second cylinder 42 can be axially limited.

Specifically, a first limiting plate 51 is arranged at the lower end opening of the first barrel 5, and two ends of the first limiting plate 51 extend to the inner side and the outer side of the first barrel 5; the support beam 31 is fixedly arranged at one end of the first limit plate 51 extending to the outer side of the first barrel 5; a first lug 422 is arranged on the outer wall of the upper end of the second cylinder 42, and the first lug 422 can be used for limiting the lower end of the first spring 41, and can be matched with one end of the first limiting plate 51 extending to the inner side of the first cylinder 5, so as to limit the axial displacement of the first cylinder 5 moving upwards relative to the second cylinder 42; a second limiting plate 421 is arranged at the lower end opening of the second cylinder 42, two ends of the second limiting plate 421 extend to the inner side and the outer side of the second cylinder 42, and one end of the second limiting plate 421 extending to the outer side of the second cylinder 42 is matched with the first limiting plate 51 to limit the axial displacement of the first cylinder 5 moving downwards relative to the second cylinder 42; a second lug 441 is further disposed on the outer wall of the upper end of the third cylinder 44, and the second lug 441 may be used to limit the lower end of the second spring 43, and may cooperate with one end of the second limiting plate 421, which extends to the inside of the second cylinder 42, to limit the axial displacement of the second cylinder 42 moving upward relative to the third cylinder 44.

The retractable support/return means 4 is not limited to the above-described specific structure, and any conventional structure may be employed which can be vertically retracted and extended, can provide a supporting force to the first cylinder 5, and can return the first cylinder 5. In addition, the number of cylinder stages in the retractable support return assembly 4 is not limited to the second cylinder 42 and the third cylinder 44 in this embodiment, and may be specifically designed according to the depth of the workpiece 100 to be spun and the distance to be maintained between the workpiece 100 and the heating element 33.

In this embodiment, a bottom heat insulation layer 8 is further disposed at the bottom of the inner cavity of the spinning support 1, and an annular heat insulation layer 9 is further disposed on the inner wall surface of the spinning support 1. The bottom layer heat insulation layer 8 and the annular heat insulation layer 9 can be used for isolating heat, and heat is prevented from being emitted from the circumferential direction and the bottom of the spinning support 1. Therefore, the upper surface of the spinning support 1 is sealed by the workpiece 100, and a sealed space can be formed by combining the bottom heat insulation layer 8 and the annular heat insulation layer 9, so that the workpiece 100 can be integrally heated, and an integrally heated environment is formed.

The working principle of the uniform heating spinning device for the end sealing piece is as follows:

fixing a spinning device on a workbench of a spinning machine tool, fixing a workpiece 100 to be formed on the upper end of a spinning support 1 through a pressure plate 2, and at the moment, contacting the upper surface of a first cylinder 5 (a workpiece bottom support) with the bottom surface of the workpiece 100 to be formed;

starting a spinning machine tool, wherein a spinning support 1 rotates along with a workbench of the spinning machine tool, a heating assembly 3 is started to heat a workpiece 100, spinning is carried out on the workpiece 100 to be formed through a spinning wheel of the spinning machine tool, the spinning wheel of the spinning machine tool moves from the edge of a pressing plate 2 to the center of the workpiece 100 along a spinning track, so that the workpiece 100 is deformed from outside to inside by one circle gradually under the action of the spinning wheel, and the workpiece 100 in deformation synchronously presses down a first cylinder 5;

because the third cylinder 44 is fixed at the bottom of the spinning support 1, and the first spring 41 and the second spring 43 are respectively installed between the first cylinder 5 and the second cylinder 42, and between the second cylinder 42 and the third cylinder 44, when the workpiece 100 deforms and sinks, the first cylinder 5 and the second cylinder 42 sink along with the first cylinder, the first spring 41 and the second spring 43 contract, and move downwards synchronously with the heating element 33 on the installation plate 32 fixed on the first cylinder 5, until the spinning of the workpiece 100 is completed, the first cylinder 5 and the second cylinder 42 sink to a certain position;

because the first cylinder 5 and the heating assembly 3 sink synchronously with the workpiece 100 and the multiple circles of heating elements 33 are arranged in concentric circles, the deformed part of the workpiece 100 and the heating elements 33 always keep a relatively constant distance, so that the deformed part of the workpiece 100 is in a uniform heating environment;

in the traditional die-free spinning process, because the lower part is not provided with a die, the bottom sinking phenomenon can actually occur, namely the actual size depth of the bottom is greater than the theoretical depth; with the spinning device of the invention, in the actual spinning process, the telescopic up-and-down moving mechanism composed of the first cylinder 5, the second cylinder 42, the third cylinder 44, the first spring 41 and the second spring 43 is equivalent to a flexible support at the bottom of the workpiece 100; when the workpiece 100 is spun to the bottom, the distance between the spinning wheel and the bottom is shorter, and meanwhile, the deformation of the spring is larger, the force of the flexible support is larger, and the sinking of the bottom of the workpiece 100 can be better resisted; the spinning device can effectively relieve the sinking phenomenon of the workpiece 100 in the spinning process;

after the workpiece 100 is spun, the workpiece 100 is taken down, and the first cylinder 5, the second cylinder 42 and the heating assembly 3 are moved upwards and reset under the action of the first spring 41 and the second spring 43.

In general, the characteristics of the seal head dieless spinning process and the characteristics of dieless spinning equipment are fully considered, and the deformation characteristics of the cylindrical spinning support 1 and the workpiece 100 used on the dieless spinning support in the spinning process are fully utilized; in the closed space formed by the spinning support 1 and the workpiece 100, the first cylinder 5 and the heating assembly 3 are driven to move downwards together by virtue of the downward deformation of the spinning workpiece 100 in the spinning process, so that the heating element 33 is always kept at a constant distance from the deformed part of the workpiece 100; meanwhile, since the heating elements 33 are arranged in concentric circular rings and have the same direction as the spinning deformation direction, the spinning device can keep the workpiece 100 in a globally uniform heating state all the time in the forming process and constantly keep the temperature at a certain temperature; in addition, during the spinning forming process of the workpiece 100, through the up-and-down movement of the retractable support resetting component 4 and the first cylinder 5, a flexible support is provided for the bottom of the workpiece 100, and the sinking phenomenon during the spinning process of the workpiece 100 is effectively relieved. The spinning device has the advantages of simple structure, convenient operation, lower cost, high forming precision and good product quality.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A uniform heating spinning device of a sealing head part comprises a spinning support (1) and a pressing plate (2), wherein the pressing plate (2) is used for fixing a workpiece (100) to be formed at an opening at the upper end of the spinning support (1), and is characterized by further comprising a workpiece bottom supporting part, a heating assembly (3) and a telescopic supporting and resetting assembly (4), wherein the workpiece bottom supporting part can be arranged in an inner cavity of the spinning support (1) in a vertically moving mode, the heating assembly (3) is fixedly connected to the lower end of the workpiece bottom supporting part, the telescopic supporting and resetting assembly (4) is arranged in the spinning support (1), and the telescopic supporting and resetting assembly (4) is connected with the workpiece bottom supporting part so as to provide upward supporting force for the workpiece bottom supporting part when the workpiece (100) is formed and enable the workpiece bottom supporting part and the heating assembly (3) to reset after the workpiece (100) is taken out;

the heating assembly (3) comprises a support beam (31), a mounting plate (32) and a heating element (33), wherein the support beam (31) is fixedly connected to the lower end of the workpiece bottom support, the mounting plate (32) is mounted on the support beam (31), the mounting plate (32) surrounds the periphery of the workpiece bottom support, and the heating element (33) is mounted on the mounting plate (32);

the workpiece bottom support is an inverted first cylinder (5), the support beam (31) is fixedly connected to the lower end of the first cylinder (5), and the heights of the mounting plate (32) and the heating element (33) are lower than the height of the upper edge of the first cylinder (5);

the mounting plate (32) is provided with a plurality of circles of heating elements (33), the plurality of circles of heating elements (33) are arranged concentrically with the first cylinder (5), and the diameters of the plurality of circles of heating elements (33) are not equal;

scalable support reset assembly (4) include first spring (41), the second barrel (42) of inversion, second spring (43) and the third barrel (44) of inversion, first barrel (5) cover is established the outside of second barrel (42), first spring (41) set up first barrel (5) with between second barrel (42), second barrel (42) cover is established the outside of third barrel (44), second spring (43) set up second barrel (42) with between third barrel (44), the bottom fixed mounting of third barrel (44) be in on the bottom plate of spinning support (1).

2. The uniformly heated spinning device of a head piece according to claim 1, characterised in that said heating element (33) is an electric heating element; the mounting plate (32) is horizontally arranged.

3. The uniform heating spinning device of the end enclosure piece according to claim 1, wherein a plurality of sliding rails (6) are installed on the inner wall of the spinning support (1) in the vertical direction, the number of the supporting beams (31) is multiple, the end portions of the supporting beams (31) are respectively installed on one sliding rail (6) through one sliding block (7), the sliding rails (6) are arranged along the circumferential direction of the inner wall of the spinning support (1), and the supporting beams (31) are arranged along the circumferential direction of the first cylinder (5).

4. The uniform-heating spinning device of the end-sealing piece according to claim 1, wherein a lower end of the first cylinder (5) is provided with a first limit plate (51) for limiting an axial displacement of the first cylinder (5) relative to the second cylinder (42), and a lower end of the second cylinder (42) is provided with a second limit plate (421) for limiting an axial displacement of the second cylinder (42) relative to the third cylinder (44).

5. The uniform heating and spinning device for the end socket piece according to any one of claims 1-4, characterized in that a bottom layer heat insulation layer (8) is arranged at the bottom of the inner cavity of the spinning support (1), and an annular heat insulation layer (9) is arranged on the inner wall surface of the spinning support (1).

6. A uniform heating spinning method of a head piece, characterized in that a spinning forming is performed on a workpiece (100) to be formed by using the spinning apparatus according to any one of claims 1 to 5, the spinning method comprising the steps of:

s1: fixing a spinning device on a workbench of a spinning machine tool, fixing a workpiece (100) to be formed on the upper end of the spinning support (1) through the pressing plate (2), and at the moment, enabling the upper surface of the supporting piece at the bottom of the workpiece to be in contact with the bottom surface of the workpiece (100) to be formed;

s2: spinning the workpiece (100) from the edge of the pressing plate (2) to the center of the workpiece (100) by a spinning wheel of a spinning machine tool in a circle, simultaneously starting the heating assembly (3) to heat the workpiece (100), synchronously sinking the workpiece bottom supporting piece and the heating assembly (3) together with the bottom of the workpiece (100) in the spinning process, and forming a flexible support for the bottom of the workpiece (100) by the rebound force of the telescopic supporting and resetting assembly (4);

s3: after the workpiece (100) is spun, the workpiece (100) is taken down, and the workpiece bottom support and the heating assembly (3) move upwards together under the action of the telescopic support resetting assembly (4) for resetting.