Special-shaped welded pipe forming roller die

Abstract

The utility model provides a special-shaped welded pipe forming roller die, which comprises an upper base, a lower base, an upper die and a lower die, cavities are arranged in the upper die and the lower die, the upper die is fixed on the surface of the upper base, the lower die is fixed on the surface of the lower base, and the upper die is fixed on the surface of the lower base. A positioning rod is movably arranged on the side face of the lower die through a traction mechanism. The positioning rods capable of transversely moving are arranged on the two sides of the upper base and the two sides of the lower base, the positioning rods can be close to each other in the die assembly process of the upper die and the lower die, and therefore the conical rubber plugs at one ends of the positioning rods extrude one end of a pipe so that the pipe can be fixed in the cavity, and positioning of the pipe is achieved; and the positioning rod is of a hollow structure, so that an external pipeline can not be influenced to fill high-pressure liquid into the pipe, and large errors caused by deviation of the pipe during roller forming can be prevented, so that a machined special-shaped part is consistent with a required product.

Description

Technical Field

[0001] The utility model relates to the technical field of special-shaped welded pipe processing, in particular to a special-shaped welded pipe forming roller die. Background Art

[0002] Welded steel pipe, also known as welded pipe, is a steel pipe made by welding steel plates or strips after curling and forming. The production process of welded steel pipe is simple, the production efficiency is high, the varieties and specifications are many, and the equipment investment is small. With the rapid development of high-quality strip steel continuous rolling production and the advancement of welding and inspection technology, the quality of welds is constantly improving, the varieties and specifications of welded steel pipes are increasing, and they are replacing seamless steel pipes in more and more fields.

[0003] Some special-shaped welded pipes, such as motorcycle exhaust pipes, are obtained by passing round pipes through roller dies through internal high pressure forming. The existing roller dies process special-shaped welded pipes by manually placing the original pipes directly in the mold cavity. This method cannot position the pipes, and the special-shaped parts processed are easily deviated due to the displacement of the pipe position during forming. Utility Model Content

[0004] The utility model aims to provide a special-shaped welded pipe forming roller die to solve the problems raised in the above background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A special-shaped welded pipe forming roller die, comprising an upper base, a lower base, an upper die and a lower die, wherein the upper die and the lower die are both provided with a cavity, the upper die is fixed to the surface of the upper base, the lower die is fixed to the surface of the lower base, a positioning rod is movably provided on the side of the lower die through a traction mechanism, the positioning rod is a hollow structure, a conical rubber plug is fixedly provided on the surface of the positioning rod, and one end of the positioning rod extends into the cavity;

[0007] The traction mechanism includes a bracket, a connecting arm and a traction rod, one end of the positioning rod passes through and is fixed on the bracket, one end of the connecting arm is fixed on the bracket, the traction rod is rotatably arranged on the side of the lower mold, and the other end of the connecting arm is slidably arranged on the traction rod through a guide member, and the traction rod cooperates with the upper mold through a driving member so that the traction rod is driven when the upper mold and the lower mold are closed.

[0008] Preferably, the guide member comprises a spherical protrusion arranged inside the connecting arm, and a guide groove arranged on the surface of the traction rod, and the spherical protrusion is slidably arranged in the guide groove.

[0009] Preferably, the driving member includes a gear fixed on the traction rod, and a rack movably arranged on the side of the upper mold through an adjustment mechanism, and the rack and the gear cooperate with each other.

[0010] Preferably, the adjustment mechanism includes a traction seat, a vertical plate and a threaded rod, the two vertical plates are vertically fixed to the side surfaces of the upper mold, one end of the threaded rod is rotated on one of the vertical plates, the other end of the threaded rod passes through the other vertical plate and is threadedly connected to the other vertical plate, the traction seat is attached to the side surface of the upper mold and is threadedly connected to the threaded rod, and one end of the rack is connected to the side surface of the traction seat.

[0011] Preferably, the projection of the guide groove on the end surface of the traction rod is exactly circular, and the cross-section of the guide groove is semicircular.

[0012] Preferably, the traction seat is arranged above the cavity, the traction rod is arranged below the cavity, and the positioning rod is arranged coaxially with the cavity.

[0013] Preferably, a positioning block is integrally formed on the top of the lower mold, and a positioning groove matching the positioning block is provided on the bottom of the upper mold.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] The utility model is provided with laterally movable positioning rods on both sides of the upper base and the lower base. Through the setting of the positioning rods, the upper mold and the lower mold can be close to each other during the process of closing the mold, so that the conical rubber plug at one end of the positioning rod squeezes one end of the pipe so that the pipe is fixed in the cavity, and the positioning of the pipe is realized. Moreover, since the positioning rod is a hollow structure, it will not affect the external pipeline filling the inside of the pipe with high-pressure liquid, and can prevent the pipe from having a large error due to offset during roller forming, so that the processed special-shaped part is consistent with the required product. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the main structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the main structure of the positioning rod of the utility model;

[0018] Figure 3 This is a schematic diagram of the connection structure between the bracket and the traction rod of the utility model;

[0019] Figure 4 It is a schematic diagram of the main structure of the regulating mechanism of the utility model.

[0020] In the figure: 1. upper base; 2. lower base; 3. upper mold; 4. lower mold; 5. cavity; 6. positioning rod; 7. conical rubber plug; 8. bracket; 9. connecting arm; 10. traction rod; 11. spherical protrusion; 12. guide groove; 13. gear; 14. rack; 15. traction seat; 16. vertical plate; 17. threaded rod; 18. positioning block; 19. positioning groove. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] See also Figure 1-4 , the utility model provides a technical solution:

[0023] Embodiment 1:

[0024] A special-shaped welded pipe forming roller die, comprising an upper base 1, a lower base 2, an upper die 3 and a lower die 4, wherein a cavity 5 is arranged inside the upper die 3 and the lower die 4, the upper die 3 is fixed to the surface of the upper base 1, the lower die 4 is fixed to the surface of the lower base 2, a positioning rod 6 is movably arranged on the side of the lower die 4 through a traction mechanism, the positioning rod 6 is a hollow structure, a conical rubber plug 7 is fixedly arranged on the surface of the positioning rod 6, one end of the positioning rod 6 extends into the cavity 5, a positioning block 18 is integrally formed on the top of the lower die 4, and a positioning groove 19 matching the positioning block 18 is arranged at the bottom of the upper die 3;

[0025] The traction mechanism includes a bracket 8, a connecting arm 9 and a traction rod 10. One end of the positioning rod 6 passes through and is fixed on the bracket 8, one end of the connecting arm 9 is fixed on the bracket 8, the traction rod 10 is rotatably set on the side of the lower mold 4, and the other end of the connecting arm 9 is slidably set on the traction rod 10 through a guide member. The traction rod 10 cooperates with the upper mold 3 through a driving member so that the traction rod 10 is driven when the upper mold 3 and the lower mold 4 are closed.

[0026] See also Figure 1 and 2, the upper mold 3 and the lower mold 4 can drive the positioning block 18 to move into the positioning groove 19 when the mold is closed, thereby realizing the precise closure between the two cavities 5, and as the upper mold 3 moves downward, the upper mold 3 can drive the bracket 8 to move toward the direction close to the cavity 5 through the driving member and the guide member. When moving, the bracket 8 can drive the positioning rod 6 and the conical rubber plug 7 fixed at one end thereof to move synchronously. As the conical rubber plug 7 enters the cavity 5, its conical portion can gradually approach one end of the pipe and block it, so that the positioning rod 6 and the inside of the pipe are connected, and through the extrusion of the two positioning rods 6 from different directions, the pipe can be fixed exactly in the middle part of the cavity 5, thereby preventing the deviation during rolling.

[0027] The guide member includes a spherical protrusion 11 arranged inside the connecting arm 9, and a guide groove 12 arranged on the surface of the traction rod 10. The spherical protrusion 11 is slidably arranged in the guide groove 12. The projection of the guide groove 12 on the end face of the traction rod 10 is exactly circular, and the cross-section of the guide groove 12 is semicircular. The driving member includes a gear 13 fixed on the traction rod 10, and a rack 14 movably arranged on the side of the upper mold 3. The rack 14 and the gear 13 cooperate with each other. The traction seat 15 is arranged above the cavity 5, the traction rod 10 is arranged below the cavity 5, and the positioning rod 6 is coaxially arranged with the cavity 5.

[0028] See also Figure 2 , 3 and 4, the upper mold 3 can drive the rack 14 to move downward synchronously, the rack 14 can drive the gear 13 to rotate when it moves downward, the gear 13 can drive the traction rod 10 to rotate synchronously when it rotates, and the traction rod 10 can drive the guide groove 12 on its surface to rotate synchronously when it rotates, so as to Figure 1 From the left side of the upper mold 3, when the rack 14 moves downward, it can drive the gear 13 to rotate counterclockwise, and the traction rod 10 and the guide groove 12 on its surface also rotate counterclockwise under the drive of the gear 13. Since the guide groove 12 is distributed on the traction rod 10 in a spiral form as a whole, as the traction rod 10 rotates, the guide groove 12 can push the bracket 8 as a whole to translate in the direction close to the lower mold 4 through the spherical protrusion 11, and the bracket 8 can drive the conical rubber plug 7 to translate synchronously through the positioning rod 6 until it enters the cavity 5 and conflicts with one end of the pipe.

[0029] It should be noted that the conical rubber plug 7 can firstly protect the inner wall and the inner edge of the tube when it is extruded, and because the inside of the tube is filled with high-pressure liquid and the outside is restricted by the cavity 5, the two ends of the tube will not be deformed due to excessive extrusion of the conical rubber plug 7, and the connection method between the other end of the positioning rod 6 and the pipeline for conveying high-pressure liquid is a technical means well known to those skilled in the art and will not be elaborated here.

[0030] Embodiment 2:

[0031] For the above scheme, the upper mold 3 can drive the gear 13 when driving the rack 14 to move downward, so that the gear 13 drives the traction rod 10 to rotate synchronously. The distance of the lateral movement of the bracket 8 is determined by the rotation angle of the traction rod 10, that is, the rotation time of the gear 13 driven by the rack 14. Therefore, in order to make the moving distance of the positioning rod 6 adjustable to adapt to pipes of different lengths, this embodiment provides an adjustment mechanism between the rack 14 and the upper mold 3. The adjustment mechanism includes a traction seat 15, a vertical plate 16 and a threaded rod 17. The two vertical plates 16 are vertically fixed to the side of the upper mold 3. One end of the threaded rod 17 is rotated on one of the vertical plates 16, and the other end of the threaded rod 17 passes through the other vertical plate 16 and is threadedly connected thereto. The traction seat 15 is attached to the side of the upper mold 3 and is threadedly connected to the threaded rod 17. One end of the rack 14 is connected to the side of the traction seat 15.

[0032] See also Figure 1 and 4 After rotating the threaded rod 17, the threaded rod 17 can drive the traction seat 15 to move vertically on the side of the upper mold 3, so that the traction seat 15 drives the rack 14 to move synchronously. In this process, the closer the lowest end of the rack 14 is to the bottom of the upper mold 3, the later the rack 14 will contact the gear 13 during the mold closing process of the upper mold 3 and the lower mold 4. Therefore, the shorter the rotation time of the gear 13, the shorter the lateral movement distance of the bracket 8. At this time, the distance between the two conical rubber plugs 7 becomes larger, so that some longer pipes can be accommodated. The longest distance that the bracket 8 moves is from one end of the guide groove 12 to the other end. Since the projection of the guide groove 12 on the end face of the traction rod 10 is exactly circular, when the bracket 8 moves from one end of the guide groove 12 to the other end, the gear 13 just rotates 360°.

[0033] Working principle: When in use, the pipe is manually placed in the cavity 5 of the lower mold 4, and then the upper mold 3 is started for mold closing. The upper mold 3 can drive the rack 14 to move downward synchronously. The rack 14 can drive the gear 13 to rotate when moving downward. The gear 13 can drive the traction rod 10 to rotate synchronously when rotating. The traction rod 10 can drive the guide groove 12 on its surface to rotate synchronously when rotating. The guide groove 12 can push the bracket 8 as a whole to translate in the direction close to the lower mold 4 through the spherical protrusion 11. The bracket 8 can drive the conical rubber plug 7 to translate synchronously through the positioning rod 6. The conical part of the conical rubber plug 7 can gradually approach one end of the pipe and block it, so that the positioning rod 6 and the inside of the pipe are connected, and the pipe can be fixed exactly in the middle part of the cavity 5 by squeezing the two positioning rods 6 from different directions.

[0034] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A special-shaped welded pipe forming roller die, comprising an upper base (1), a lower base (2), an upper die (3) and a lower die (4), wherein the upper die (3) and the lower die (4) are both provided with a cavity (5), the upper die (3) is fixed to the surface of the upper base (1), and the lower die (4) is fixed to the surface of the lower base (2), characterized in that: A positioning rod (6) is movably provided on the side of the lower mold (4) through a traction mechanism, the positioning rod (6) is a hollow structure, a conical rubber plug (7) is fixedly provided on the surface of the positioning rod (6), and one end of the positioning rod (6) extends into the mold cavity (5); The traction mechanism comprises a bracket (8), a connecting arm (9) and a traction rod (10); one end of the positioning rod (6) passes through and is fixed on the bracket (8); one end of the connecting arm (9) is fixed on the bracket (8); the traction rod (10) is rotatably arranged on the side of the lower mold (4); the other end of the connecting arm (9) is slidably arranged on the traction rod (10) through a guide member; the traction rod (10) cooperates with the upper mold (3) through a driving member so that the traction rod (10) is driven when the upper mold (3) and the lower mold (4) are molded together.

2. The roller die for forming a special-shaped welded pipe according to claim 1, characterized in that: The guide member comprises a spherical protrusion (11) arranged inside the connecting arm (9) and a guide groove (12) arranged on the surface of the traction rod (10), and the spherical protrusion (11) is slidably arranged in the guide groove (12).

3. The roller die for forming a special-shaped welded pipe according to claim 2, characterized in that: The driving member comprises a gear (13) fixed on the traction rod (10), and a rack (14) movably arranged on the side of the upper mold (3) through an adjustment mechanism, and the rack (14) and the gear (13) cooperate with each other.

4. The roller die for forming a special-shaped welded pipe according to claim 3, characterized in that: The adjustment mechanism comprises a traction seat (15), a vertical plate (16) and a threaded rod (17); the two vertical plates (16) are vertically fixed to the side surfaces of the upper mold (3); one end of the threaded rod (17) is rotated on one of the vertical plates (16); the other end of the threaded rod (17) passes through the other vertical plate (16) and is threadedly connected thereto; the traction seat (15) is attached to the side surface of the upper mold (3) and is threadedly connected to the threaded rod (17); one end of the rack (14) is connected to the side surface of the traction seat (15).

5. The roller die for forming a special-shaped welded pipe according to claim 2, characterized in that: The projection of the guide groove (12) on the end surface of the traction rod (10) is exactly circular, and the cross section of the guide groove (12) is semicircular.

6. The roller die for forming a special-shaped welded pipe according to claim 4, characterized in that: The traction seat (15) is arranged above the mold cavity (5), the traction rod (10) is arranged below the mold cavity (5), and the positioning rod (6) is arranged coaxially with the mold cavity (5).

7. The roller die for forming a special-shaped welded pipe according to claim 1, characterized in that: A positioning block (18) is integrally formed on the top of the lower mold (4), and a positioning groove (19) matching the positioning block (18) is provided on the bottom of the upper mold (3).

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