A method for forming a ring-shaped wool button and the ring-shaped wool button

Abstract

The present invention relates to a forming method of an annular wool button and the annular wool button, the forming method comprising the following steps: bending a straight metal wire to form a three-dimensional wavy metal wire; selecting a mandrel of a certain size, and setting two pin groups distributed along the axial interval on the outer periphery of the mandrel; winding and fixing the initial end of the three-dimensional wavy metal wire at the root of the first pin of the first pin group, then pulling the three-dimensional wavy metal wire along the axis of the mandrel and hanging it at the root of the first pin of the second pin group, then pulling the three-dimensional wavy metal wire and hanging it at the root of the second pin of the first pin group, repeating the above operation until the three-dimensional wavy metal wire is hung at the root of the last pin of the second pin group, completing the laying of a layer of three-dimensional wavy metal wire; repeating the above operation to obtain an annular wool button blank; and punching to obtain the annular wool button. The present invention can produce an annular wool button with good elasticity, non-stratified meshing, and uniformity.

Description

Technical Field

[0001] The invention belongs to the technical field of annular wool button molding, and in particular relates to an annular wool button molding method and the annular wool button. Background Art

[0002] Annular wool buttons with a circular cross-section are generally used in RF connectors to achieve elastic contact of the end faces and achieve the function of grounding and shielding. Annular wool buttons with a square cross-section are generally used in high-speed connectors to achieve elastic contact of the end faces and achieve the function of signal transmission. The existing technology does not have the relevant technology for the molding of annular wool buttons. At present, the structural products similar to annular wool buttons include metal rubber. There are two main molding methods: one is to weave the metal wire into a mesh, then wrap the wire mesh, and finally use a mold to stamp it. The other is to make the metal wire form a spiral roll through a mechanical device, and then wind the spiral roll formed by the metal wire onto the blank laying mechanism to form a metal rubber blank, and then remove the metal rubber blank and put it into the stamping die to obtain the relevant sample. The above methods have the following problems: 1. Poor meshing and easy delamination; 2. Poor axial elasticity, can not achieve good end face elastic contact; therefore, it is not possible to obtain an annular wool button with good performance through the above method. Summary of the invention

[0003] In order to solve the above problems, the present invention provides a method for forming a ring-shaped wool button, which comprises first bending a metal wire into a three-dimensional wavy shape, then laying the three-dimensional wavy metal wire to form a ring-shaped blank, and then stamping the blank, thereby obtaining a ring-shaped wool button with good elasticity, good meshing, no stratification, and uniformity.

[0004] The purpose of the present invention and the technical problem to be solved are achieved by adopting the following technical solutions. A method for forming a ring-shaped wool button according to the present invention comprises the following steps: the first step is to bend a straight metal wire 4 to form a three-dimensional wavy metal wire 5, wherein adjacent crests and troughs of the three-dimensional wavy metal wire 5 are not on the same plane; the second step is to select a core shaft 6 of a certain size, and set two axially spaced pin groups on the periphery of the core shaft 6, each pin group includes the same number of pins 7 uniformly distributed along the circumference of the core shaft 6; the third step is to wrap the initial end of the three-dimensional wavy metal wire 5 around and fix it at the root of the No. 1 pin 7 of the first pin group, and then pull it along the axis of the core shaft 6. The three-dimensional wavy metal wire 5 is hung on the root of the No. 1 pin 7 of the second pin group, and then the three-dimensional wavy metal wire 5 is pulled axially along the core shaft 6 to hang it on the root of the No. 2 pin 7 of the first pin group, and the above operation is repeated until the three-dimensional wavy metal wire 5 is hung on the root of the last pin 7 of the second pin group, and the laying of a layer of three-dimensional wavy metal wire is completed; the above operation is repeated to complete the laying of the set layer of three-dimensional wavy metal wire to obtain a ring-shaped wool button blank 10; the fourth step is to remove the pin 7, and the above-mentioned ring-shaped wool button blank 10 is punched by a punching device to obtain a ring-shaped wool button.

[0005] The purpose of the present invention and the solution to its technical problems can be further achieved by adopting the following technical measures.

[0006] In the aforementioned method for forming annular wool buttons, the projections of the wave crests and wave troughs of the three-dimensional wavy metal wire 5 in the extension direction are all on the same circumference.

[0007] In the aforementioned method for forming annular wool buttons, the straight metal wire is bent by two meshing gears to form a wavy line, and the two gears rotate in meshing while also revolving around the axis therebetween, so that the wavy line rotates during the forming process to obtain a three-dimensional wavy metal wire.

[0008] In the aforementioned method for forming annular wool buttons, the spacing between adjacent pins in the same pin group is less than 0.5 mm.

[0009] In the aforementioned method for forming annular wool buttons, the pins 7 in different pin groups are staggeredly distributed in the circumferential direction of the core shaft 6 .

[0010] In the aforementioned method for forming annular wool buttons, during the laying process, each time the wire is hung, the tension at both ends of the three-dimensional wavy metal wire is constant, so that the laid three-dimensional wavy metal wire is evenly stressed at all locations.

[0011] In the aforementioned forming method of annular wool buttons, when annular wool buttons with a circular cross section are produced, the core shaft selected in the second step is a circular shaft, and in the fourth step, the punching device punches the annular wool button blank 10 in multiple axial step-by-step extrusions, so that the axial size of the annular wool button blank 10 is gradually reduced, so that the annular wool button is well meshed and uniform. In the aforementioned forming method of annular wool buttons, after each punching is completed, the punching device remains at the punching completion position for at least 5 seconds.

[0012] In the fourth step of the aforementioned forming method of annular wool buttons, the stamping device includes two relatively distributed stamping dies and a stamping outer diameter sleeve 11 for circumferentially limiting the annular wool button blank 10 during the stamping process, and both ends of the core shaft 6 are located in the stamping cylinders of the two stamping dies and are matched with the stamping cylinders with a small gap; the outer diameter of the stamping cylinder is matched with the inner diameter of the stamping outer sleeve with a small gap.

[0013] In the aforementioned forming method of annular wool buttons, when annular wool buttons with a directional cross-section are produced, the core shaft selected in the second step is a square shaft, and in the fourth step, the stamping device stamps the annular wool buttons in multiple times, and each stamping includes a radial stamping and an axial stamping performed successively, thereby gradually reducing the radial and axial dimensions of the annular wool button blank.

[0014] The aforementioned method for forming annular wool buttons, wherein the radial stamping is achieved by a radial stamping device composed of four radial shrinkage blocks. When performing radial stamping, the centers of the four radial shrinkage blocks are always maintained on a circle with the center of the square cavity surrounded by them as the center, and the adjacent side surfaces of adjacent radial shrinkage blocks are kept overlapping.

[0015] In the aforementioned forming method of annular wool buttons, during each stamping, both ends of the core shaft are located in the axial stamping sleeve for realizing the axial stamping during radial stamping, and when the radial stamping is completed, the radial shrinkage block reaches the outer diameter size position of the axial stamping sleeve for realizing the axial stamping.

[0016] In the aforementioned method for forming annular wool buttons, in the second step, only a square core shaft of a certain size is selected; in the third step, the three-dimensional wavy metal wire is pulled circumferentially between the first position and the second position on the outer circumference of the selected core shaft for repeated winding to complete the laying of a set number of layers of the three-dimensional wavy metal wire to obtain an annular wool button blank.

[0017] Compared with the prior art, the present invention has obvious advantages and beneficial effects. By means of the above technical solution, the present invention can achieve considerable technical advancement and practicality, and has wide industrial utilization value, and has at least the following advantages:

[0018] The metal wire of the present invention is bent into a three-dimensional wave shape, so that the metal wire for preparing the annular wool button has good elasticity. The present invention lays the three-dimensional wave metal wire axially in an interlaced manner to form a blank, so as to achieve good meshing of the annular wool button with a circular or square cross section, and is not easy to delaminate after stamping. The present invention can also form a blank by laying the three-dimensional wave metal wire circumferentially through winding, and then stamping to form an annular wool button with a square cross section with good meshing.

[0019] The present invention places the blank into a stamping die for multiple step-by-step extrusion, which can make the metal deform evenly and mesh more evenly, and has a significant effect on the consistency of the outer dimensions of the ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of bending a metal wire into a three-dimensional wave shape through a planetary rotation model;

[0021] Figure 2 It is a schematic diagram of a three-dimensional wavy metal wire after bending;

[0022] Figure 3 A schematic diagram of axially staggered laying of wavy metal wires to form a blank;

[0023] Figure 4 It is a schematic diagram of a blank to be stamped in accordance with the first embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of primary stamping of a blank according to an embodiment of the present invention;

[0025] Figure 6 This is a schematic diagram of secondary stamping of a blank in Embodiment 1 of the present invention;

[0026] Figure 7 This is a schematic diagram of a ring-shaped wool button formed by punching in the first embodiment of the present invention;

[0027] Figure 8 This is a front view of a blank punched once in the second embodiment of the present invention;

[0028] Fig. 9 It is a left side view of a blank after a single punching according to the second embodiment of the present invention;

[0029] Fig.10 This is a front view of the second stamping of the blank in the second embodiment of the present invention;

[0030] Fig.11 It is a left side view of the second stamping of the blank in the second embodiment of the present invention;

[0031] Fig.12 This is a front view of a blank subjected to three stampings in the second embodiment of the present invention;

[0032] Fig.13It is a left side view of the blank after three stampings in the second embodiment of the present invention;

[0033] Fig.14 This is a schematic diagram of a ring-shaped wool button formed by punching in the second embodiment of the present invention;

[0034] Fig.15 This is a schematic diagram of circumferentially laying wavy metal wires to form a blank according to Example 3 of the present invention.

[0035]

Main component symbol description

[0036] 1. First gear; 2. Second gear; 3. Rotating shaft; 4. Straight wire; 5. Three-dimensional wavy wire; 6. Mandrel; 7. Pin; 8. First stamping die; 9. Second stamping die; 10. Ring-shaped button blank; 11. Stamping outer diameter sleeve; 12. Radial shrinkage block; 13. Shrinkage movement direction; 14. First stamping sleeve; 15. Square cavity; 16. Second stamping sleeve; 17. Third stamping sleeve. DETAILED DESCRIPTION

[0037] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the specific implementation method, structure, characteristics and effects of the ring-shaped wool button forming method proposed by the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0038] Embodiment 1 of the present invention discloses a method for forming a ring-shaped wool button with a circular cross-section, which comprises the following steps:

[0039] In the first step, the straight metal wire 4 is bent into a three-dimensional wave shape to obtain the following Figure 2 The three-dimensional wavy metal wire 5 is formed by rotating the straight metal wire 4 during the bending process, and the adjacent protrusions and depressions on the three-dimensional wavy metal wire 5 are not on the same plane. In this embodiment, the three-dimensional wavy metal wire 5 is consistent with the shape formed by rotating the crests and troughs of the sine curve around the X-axis during the extension process. That is, the three-dimensional wavy metal wire 5 of the present invention follows the distribution law of the sine curve as a whole, and the projections of the crests and troughs of the three-dimensional wavy metal wire 5 in the extension direction are all on the same circumference. Due to its special three-dimensional structure, the three-dimensional wavy metal wire 5 of the present invention is not easy to loosen when multiple meshing, and is more compact; at the same time, the metal wire has a wavy structure, and the wavy structure is still partially maintained after stamping, thereby ensuring that the structure has good elasticity.

[0040] In the embodiment of the present invention, the three-dimensional wavy metal wire 5 is formed by planetary mold processing. Figure 1As shown, the planetary mold includes a first gear 1 and a second gear 2 meshing with each other and a rotating shaft 3 that drives the first gear 1 and the second gear 2 to rotate at the same time. The rotating shaft 3 allows the first gear 1 and the second gear 2 to rotate while also revolving. The linear wire 4 is located between the first gear 1 and the second gear 2. The first gear 1 and the second gear 2 bend the linear wire 4 into a wavy shape during the meshing rotation. Due to the existence of the revolution, the linear wire 4 also rotates around the axis between the first gear 1 and the second gear 2 during the bending process, thereby causing the crests and troughs of the wave line formed after bending to also rotate around the revolving shaft to form a three-dimensional wavy wire 5. In this embodiment, the first gear 1 and the second gear 2 have exactly the same size. The three-dimensional wavy wire 5 of the present invention can also be bent and formed in other ways.

[0041] In the second step, a mandrel 6 of a certain diameter and length is selected, the mandrel 6 is a round shaft, and two groups of pin groups are arranged on the outer circumference of the mandrel 6 at intervals along the axial direction, each pin group includes a plurality of pins 7 evenly distributed along the circumference of the mandrel 6. Preferably, the pins 7 of the two pin groups are staggered in the circumferential direction of the mandrel, so that the two pin groups are staggered, and the connecting line of any pin 7 in the first pin group and the pin in the second pin group intersects the axis of the mandrel 6. The two pin groups have the same number of pins, and the spacing between adjacent pins 7 in the same pin group is less than 0.5 mm.

[0042] like Figure 3 As shown, the initial end of the three-dimensional wavy metal wire 5 is wound and fixed on the root of the No. 1 pin 7 of the first pin group, and then the three-dimensional wavy metal wire 5 is pulled along the axis of the mandrel 6 and hung on the root of the No. 1 pin 7 of the second pin group, and finally the three-dimensional wavy metal wire 5 is pulled axially along the mandrel 6 and hung on the root of the No. 2 pin 7 of the first pin group. Repeat the above operation until the three-dimensional wavy metal wire 5 is hung on the root of the last pin of the second pin group, at which time the mandrel 6 is evenly covered with a layer of three-dimensional wavy metal wire 5 in the circumferential direction. Repeat the above steps of hanging the three-dimensional wavy metal wire 5 from the No. 1 pin 7 of the first pin group to the last pin of the No. 2 pin group according to the design requirements, and complete the laying of the annular button blank 10.

[0043] In this step, the three-dimensional wavy metal wire 5 is laid back and forth along the axial direction of the core shaft 6 to form a staggered structure, so that the three-dimensional wavy metal wire 5 can be evenly laid and wrapped around the circumference of the core shaft 6. While staggered laying, due to the three-dimensional wavy structure of the metal wire, the three-dimensional wavy metal wire 5 is not easy to loosen on the core shaft 6, and the meshing is more tightly after stamping, so that the annular wool button is uniformly and tightly meshed around the circumference.

[0044] During the above-mentioned laying process, the force on the pins is kept constant each time the wire is hung, so that the three-dimensional wavy metal wire is laid evenly and the force is uniform.

[0045] The third step is to remove the pin on the mandrel 6, and then the annular wool button blank 10 laid on the mandrel 6 is punched into a circular ring by a punching device to obtain an annular wool button with a circular cross section. Figure 4 As shown, the punching device includes a first punching die 8 and a second punching die 9 which are relatively distributed, wherein the first punching die 8 and the second punching die 9 both have a punching cylinder whose inner diameter is slightly larger than the outer diameter of the core shaft 6, and the two ends of the core shaft 6 are respectively inserted into the punching cylinders of the first punching die 8 and the second punching die 9, and are matched with the punching cylinders with a small gap. The punching device also includes a punching outer diameter sleeve 11 which is used to be sleeved outside the annular button blank 10 during punching, and is used to cooperate with the core shaft 6 to limit the radial deformation of the annular button blank 10 during the punching process. The bottom of the punching outer diameter sleeve 11 is also provided with a supporting device so that it can maintain a small gap match with the annular button blank 10.

[0046] In order to make the annular wool buttons uniform during stamping, the first embodiment of the present invention adopts a two-step graded stamping method. Figure 5 The invention is a stamping schematic diagram for performing a first-stage stamping. When performing a first-stage stamping, the first stamping die 8 and the second stamping die 9 are first moved relative to each other by a set distance to complete the first-stage stamping, and then the state of the stamping completion is maintained for at least 5 seconds; then, according to the set outer diameter size of the annular wool button, the first stamping die 8 and the second stamping die 9 are moved relative to each other again to a set distance, and the annular wool button of the required shape is obtained after staying for at least 5 seconds. The multiple step-by-step graded stamping method of the present invention can make the metal deform evenly, the meshing is more even, and has a significant effect on the consistency of the outer dimensions of the ring.

[0047] In other embodiments of the present invention, different punching times can be selected as needed.

[0048] The second embodiment of the present invention provides a method for forming a circular wool button with a square cross section. The difference between this embodiment and the first embodiment is that the mandrel 6 selected in the second step is a square shaft, and the stamping method and stamping device used in the third step are different. In this embodiment, in the third step, the pin on the mandrel 6 is removed, and then the circular wool button blank 10 laid on the mandrel 6 is stamped by radial and axial stamping devices in turn to obtain a circular wool button with a square cross section. Specifically, as Figure 8-13As shown, the punching device in this embodiment includes a radial punching device composed of four identical radial shrinking blocks 12 and an axial punching device composed of two relatively distributed punching sleeves. The mandrel 6 wrapped with the annular button blank 10 is placed in the middle of the radial punching device, and then the four radial shrinking blocks 12 constituting the radial punching device are driven to shrink radially, so as to complete the radial punching of the annular button blank 10. Then, the axial punching device having the same size as the annular button blank 10 after radial punching is used to axially punch the annular button blank 10 after radial punching.

[0049] In this embodiment, the stamping of the annular button blank 10 is carried out three times, each stamping includes a radial stamping and an axial stamping, and the annular button blank 10 after each radial stamping has a radial size consistent with that of the stamping sleeve during the axial stamping.

[0050] In this embodiment, the four radial shrinkage blocks 12 constituting the radial stamping device are distributed on the same circumference, and in any state, the adjacent surfaces of two adjacent radial shrinkage blocks 12 in the radial stamping device are partially in contact with each other, so that a circumferentially closed square cavity 15 is formed in the middle of the four radial shrinkage blocks 12, and the center of the square cavity 15 is consistent with the center of the circle where the four radial shrinkage blocks 12 are located. And each time the radial stamping device shrinks and stamps, the centers of the four radial shrinkage blocks 12 are synchronously transferred from a circle of the same larger size to another concentric circle of a smaller size, so that when radial stamping is performed, the square cavity 15 surrounded by the four radial shrinkage blocks 12 always remains circumferentially closed and gradually shrinks, preventing metal wire from overflowing from the gap between adjacent radial shrinkage blocks 12 during radial stamping. When radial stamping is performed, the core shaft 6 is located in the square cavity 15 of the radial stamping device and remains coaxial with the square cavity 15. As shown in FIG. Figure 8 and Fig.10 As shown, in Figure 8 In the embodiment, the four radial contraction blocks 12 are located on a circle with a radius of R1, and after one contraction, the four radial contraction blocks 12 rotate to a circle with a radius of R2, wherein R1 is greater than R2.

[0051] In this embodiment, when performing the first stamping, the core shaft 6 is passed through the center of the square cavity 15 of the radial stamping device, and its two ends are respectively inserted into two relatively distributed first stamping sleeves 14, and then the four radial shrinking blocks 12 are synchronously rotated inward clockwise or counterclockwise to reduce the size of the square cavity 15 surrounded by them, thereby completing the first radial stamping of the annular button blank 10. At this time, the radial shrinking block 12 reaches a position with the same outer diameter as the first stamping sleeve 14, and then drives the two first stamping sleeves 14 to move relative to each other, squeezing the annular button blank 10 to reduce its axial length on the core shaft 6, thereby completing a stamping. Preferably, the axial length of the annular button blank 10 on the core shaft 6 is reduced by 1 / 3 of the original winding length, but is not limited thereto.

[0052] Replace the stamping sleeve, use a smaller second stamping sleeve 16 to replace the first stamping sleeve 14, then control the radial shrinkage block 12 to perform a second radial stamping, so that the four radial shrinkage blocks 12 reach the position of the outer diameter of the second stamping sleeve 16, and finally drive the two second stamping sleeves 16 to move axially relative to each other, so that the axial size of the annular button blank 10 on the mandrel 6 is further reduced, and the secondary stamping is completed. Preferably, the axial length of the annular button blank 10 on the mandrel 6 is reduced again by 1 / 3 of the original winding length, but it is not limited thereto.

[0053] The stamping sleeve is replaced again, and the second stamping sleeve 16 is replaced by the third stamping sleeve 17 whose size is reduced again, and then the radial shrinkage block 12 is controlled to perform a third stamping, so that the four radial shrinkage blocks 12 reach the position of the outer diameter of the third stamping sleeve 17, and finally the two third stamping sleeves 17 are driven to move axially relative to each other, so that the axial size of the annular button blank 10 on the core shaft 6 is reduced to the set value, and the following can be obtained: Fig.15 The shown circular wool button has a square cross section.

[0054] In other embodiments of the present invention, two or more punching steps may be used to achieve the punching of the annular wool button with a square cross-section.

[0055] The third embodiment of the present invention also provides a method for forming a circular wool button with a square cross section. The difference between this embodiment and the second embodiment is that: Fig.14As shown, in this embodiment, the mandrel 6 selected in the second step is no longer provided with a pin. After selecting a mandrel 6 of a suitable size, the initial end of the three-dimensional wavy metal wire 5 is pressed on the first position of the outer periphery of the mandrel 6, and then the three-dimensional wavy metal wire 5 is pulled circumferentially around the mandrel 6 to the direction of the second position of the outer periphery of the mandrel 6 for winding. When the three-dimensional wavy metal wire 5 reaches the second position of the outer periphery of the mandrel 6, the laying of the first layer of metal layer is completed, and then the three-dimensional wavy metal wire 5 is pulled circumferentially around the mandrel 6 from the second position of the outer periphery of the mandrel 6 to the first position to lay the second layer of metal wire. The above steps are repeated to complete the laying of the set size of the annular button blank 10. Finally, the method of the second embodiment is used to stamp the annular button blank to obtain an annular button with a cross section in the direction.

[0056] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with the profession can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A method for forming a circular wool button, characterized in that: The following steps are involved: The first step is to bend the straight metal wire to form a three-dimensional wavy metal wire, wherein adjacent wave crests and wave troughs of the three-dimensional wavy metal wire are not on the same plane; The second step is to select a mandrel of a certain size and set two pin groups spaced apart in the axial direction on the outer circumference of the mandrel, each pin group including the same number of pins evenly distributed in the circumferential direction of the mandrel; The third step is to wind and fix the initial end of the three-dimensional wavy metal wire around the root of the No. 1 pin of the first pin group, then pull the three-dimensional wavy metal wire axially along the mandrel and hang it on the root of the No. 1 pin of the second pin group, then pull the three-dimensional wavy metal wire axially along the mandrel and hang it on the root of the No. 2 pin of the first pin group, and repeat the above operation until the three-dimensional wavy metal wire is hung on the root of the last No. 1 pin of the second pin group, and the laying of one layer of three-dimensional wavy metal wire is completed; repeat the above operation to complete the laying of the set number of layers of three-dimensional wavy metal wire to obtain a ring-shaped button blank; The fourth step is to remove the pin and punch the annular wool button blank through a punching device to obtain the annular wool button.

2. The method for forming an annular wool button according to claim 1, characterized in that: The projections of the wave crests and wave troughs of the three-dimensional wavy metal wire in the extension direction are all on the same circumference.

3. The method for forming an annular wool button according to claim 1, characterized in that: The straight metal wire is bent by two meshing gears to form a wavy line. The two gears rotate in meshing and revolve around the axis therebetween, so that the wavy line rotates during the forming process to obtain a three-dimensional wavy metal wire.

4. The method for forming an annular wool button according to claim 1, characterized in that: The spacing between adjacent pins in the same pin group is less than 0.5 mm.

5. The method for forming an annular wool button according to claim 4, characterized in that: The pins in different pin groups are staggeredly distributed in the circumferential direction of the core shaft.

6. The method for forming an annular wool button according to claim 1, characterized in that: During the laying process, each time the wire is hung, the tension at both ends of the three-dimensional wavy metal wire is constant.

7. The method for forming an annular wool button according to claim 1, characterized in that: When making an annular button with a circular cross-section, the core shaft selected in the second step is a circular shaft, and in the fourth step, the punching device punches the annular button blank in the axial direction for multiple step-by-step extrusions, so that the axial size of the annular button blank is gradually reduced.

8. The method for forming an annular wool button according to claim 7, characterized in that: In the fourth step, the stamping device includes two relatively distributed stamping dies and a stamping outer diameter sleeve for circumferentially limiting the annular button blank during the stamping process. The two ends of the core shaft are located in the stamping cylinders of the two stamping dies and are matched with the stamping cylinders with a small gap; the outer diameter of the stamping cylinder is matched with the inner diameter of the stamping outer sleeve with a small gap.

9. The method for forming a circular wool button according to claim 1, characterized in that When making an annular wool button with a directional cross-section, the core shaft selected in the second step is a square shaft. In the fourth step, the punching device punches the annular wool button for multiple times. Each punching includes a radial punching and an axial punching performed successively, gradually reducing the radial and axial dimensions of the annular wool button blank.

10. The method for forming a circular wool button according to claim 9, characterized in that The radial stamping is achieved by a radial stamping device composed of four radial shrinkage blocks. When performing radial stamping, the centers of the four radial shrinkage blocks are always maintained on a circle with the center of the square cavity surrounded by them as the center, and the adjacent side surfaces of adjacent radial shrinkage blocks are kept overlapping.

11. The method for forming a circular wool button according to claim 10, characterized in that During each stamping, both ends of the core shaft are located in the axial stamping sleeve for realizing the axial stamping during radial stamping, and when the radial stamping is completed, the radial shrinkage block reaches the outer diameter size position of the axial stamping sleeve for realizing the axial stamping.

12. The method for forming a circular wool button according to any one of claims 9 to 11, characterized in that In the second step, only a square mandrel of a certain size is selected; in the third step, the three-dimensional wavy metal wire is pulled circumferentially between the first position and the second position on the outer circumference of the selected mandrel for repeated winding to complete the laying of the set number of layers of the three-dimensional wavy metal wire to obtain a ring-shaped button blank.

13. A circular wool button, characterized in that: The product is formed by the method described in any one of claims 1 to 12.

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