Pipe fitting push-bending die and pipe fitting push-bending method

Abstract

The invention relates to the technical field of metal machining, and particularly discloses a pipe fitting push-bending die and a pipe fitting push-bending method.The pipe fitting push-bending die comprises a bottom plate, a module, a positioning assembly and a push head, the module is fixedly connected to the bottom plate, a containing groove is formed in the module, the positioning assembly is installed on the bottom plate, and the positioning assembly is used for positioning and supporting a pipe fitting; the module and the push head are located on the two sides of the pipe fitting correspondingly, and the push head can move in the horizontal direction relative to the bottom plate and enter the containing groove so that the pipe fitting can be pushed into the containing groove to be subjected to plastic deformation. The pipe fitting is finally pushed to be bent into a required structure under the constraint of the push head and the module, as the push head moves horizontally, the vertical space at a machine table of pressure equipment is not additionally required in the forming process, the positioning assembly ensures that the initial position of the pipe fitting is accurate, the situation that the local deformation quantity is not matched with the material thickness after the pipe fitting slides is avoided, and the product quality is improved. The occurrence probability of wrinkles and recesses is reduced, and the rejection rate is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of metal processing, and in particular to a pipe bending die and a pipe bending method. Background Art

[0002] The front fork structure of a bicycle is usually made of aluminum alloy or carbon fiber. The front fork made of carbon fiber is usually an integrated structure, which ensures structural strength while also improving lightness and taking into account aesthetics. However, the cost of carbon fiber is relatively high and cannot be used on low-priced models. The cost of aluminum alloy is much lower than that of carbon fiber, and to a certain extent, it also has higher structural strength and lightness. Therefore, most existing models use aluminum alloy to make front forks. Aluminum alloy front forks are usually welded together by welding two fork legs and a crown. There is an obvious weld at the welding position, which affects the aesthetics. In addition, the welding position is prone to problems such as poor welding, which affects the strength and life of the weld.

[0003] In this regard, the prior art provides an integrated aluminum alloy front fork structure, which is formed by vertically bending the aluminum alloy billet pipe and then performing water swelling forming. During the bending process, on the one hand, the machine platform of the pressure equipment needs to have a sufficiently large vertical space, and on the other hand, the aluminum alloy pipe is easily affected by gravity and slides slightly, resulting in a mismatch between the thickness and deformation of the final formed pipe at a local position, resulting in wrinkles or depressions and other defects, leading to scrapping. Summary of the invention

[0004] The purpose of the present invention is to provide a pipe bending die and a pipe bending method to press and bend aluminum alloy pipes, simplify the process steps, and improve production efficiency.

[0005] The present invention provides a pipe bending die, comprising a base plate, a module, a positioning assembly and a push head, the module is fixedly connected to the base plate, a receiving groove is provided on the module, the positioning assembly is installed on the base plate, the positioning assembly is used to position and support the pipe, the module and the push head are respectively located on both sides of the pipe, the push head can move in a horizontal direction relative to the base plate and enter the receiving groove to push the pipe into the receiving groove for plastic deformation.

[0006] As an optimal technical solution for the pipe bending mold, the push head can fit with the inner side wall of the module's accommodating groove, and the inner side wall of the module's accommodating groove is also provided with a first molding groove and a second molding groove. The push head is provided with a third molding groove, and the third molding groove together with the first molding groove and the second molding groove form a molding space, and the molding space is used to accommodate the pipe.

[0007] As an optimal technical solution for the pipe bending mold, the module includes two sub-blocks, both of which are fixedly connected to the base plate, and both of which are provided with the first molding groove and the second sub-molding groove. The two sub-blocks are buckled together to form the accommodating groove, and the second sub-molding grooves of the two sub-blocks together form the second molding groove.

[0008] As a preferred technical solution for the pipe bending die, the module is further provided with an introduction portion, which is a rounded structure and is arranged at one end of the groove wall of the first forming groove away from the groove wall of the second forming groove.

[0009] As an optimal technical solution for the pipe bending die, a limiting groove is provided at one end of the push head close to the pipe, and when the push head pushes the pipe into the accommodating groove, part of the pipe cooperates with the groove wall of the limiting groove.

[0010] As an optimal technical solution for the pipe bending die, a slide rail is provided on the bottom plate, the slide rail and the accommodating groove extend in the same direction, the push head is provided with a slide groove, and is slidably connected to the slide rail through the slide groove.

[0011] As an optimal technical solution for the pipe bending die, the positioning assembly includes an extension plate, a clamping plate and two guide blocks. The two guide blocks are mounted on the base plate and are respectively located on both sides of the module. The guide blocks are used to support the pipe. One end of the extension plate is mounted on the base plate, and the other end extends away from the base plate. The clamping plate is fixedly connected to one end of the extension plate away from the base plate, and the clamping plate is used to fit with one end of the pipe.

[0012] As a preferred technical solution for the pipe bending die, an adjustment hole is provided on the clamping plate, the adjustment hole extends along the length direction of the extension plate, and a fastener passes through the adjustment hole to fix the clamping plate and the extension plate.

[0013] As a preferred technical solution for the pipe push-bending die, the push head is made of polyoxymethylene, polyketone, polyethylene or nylon.

[0014] The present invention provides a pipe bending method, which uses the pipe bending die of any of the above solutions to bend the pipe. The pipe bending method comprises:

[0015] The pipe fitting is positioned and supported on the positioning assembly and is located between the module and the pusher head;

[0016] The push head moves horizontally to push the pipe fitting into the receiving groove of the module to cause plastic deformation of the pipe fitting.

[0017] The beneficial effects of the present invention are:

[0018] The present invention provides a pipe bending die, which positions and supports the pipe through a positioning assembly, and the push head pushes the pipe into a receiving groove when moving horizontally, so that the pipe undergoes plastic deformation, and the pipe is finally bent into a desired structure under the constraints of the push head and the module. Since the push head moves horizontally, there is no additional demand for the vertical space at the press machine during the molding process, and the positioning assembly positions and supports the pipe, ensuring that the initial position of the pipe is accurate, avoiding the situation where the local deformation of the pipe does not match the material thickness due to the inaccurate position of the pipe after sliding, thereby reducing the probability of wrinkles and depressions and reducing the scrap rate.

[0019] The invention provides a pipe bending method, by using the pipe bending die of the invention to bend the pipe, the probability of wrinkles and depressions occurring after the pipe is formed is reduced, and the scrap rate is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is one of the structural schematic diagrams of a pipe bending die bending a pipe in an embodiment of the present invention;

[0021] Figure 2 This is a second structural schematic diagram of a pipe bending die bending a pipe in an embodiment of the present invention;

[0022] Figure 3 It is a structural schematic diagram of a module of a pipe bending die in an embodiment of the present invention;

[0023] Figure 4 A cross-sectional view of a module of a pipe bending die in an embodiment of the present invention;

[0024] Figure 5 It is a structural schematic diagram of a push head of a pipe bending die in an embodiment of the present invention;

[0025] Figure 6 It is a cross-sectional view of a push head of a pipe bending die in an embodiment of the present invention.

[0026] In the figure:

[0027] 100. Pipe fittings;

[0028] 1. Bottom plate; 11. Slide rail; 2. Module; 21. First molding groove; 22. Second molding groove; 23. Introduction part; 3. Push head; 31. Third molding groove; 32. Limiting groove; 33. Slide groove; 4. Guide block; 41. Guide wall; 51. Extension plate; 52. Card plate; 521. Adjustment hole. DETAILED DESCRIPTION

[0029] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and the first feature "above", "above" and "above" the second feature include the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature "below", "below" and "below" the second feature include the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0033] like Figure 1-Figure 6As shown, the present invention provides a pipe bending die for bending a pipe 100. The pipe 100 in this embodiment is made of aluminum alloy. The pipe bending die includes a base plate 1, a module 2, a positioning assembly and a push head 3. The base plate 1 is arranged horizontally, the module 2 is fixedly connected to the base plate 1, and a receiving groove is arranged on the module 2, and the receiving groove extends in the horizontal direction. The positioning assembly is mounted on the base plate 1 and is located outside the opening of the receiving groove of the module 2. The positioning assembly is used to position and support the pipe 100. The module 2 and the push head 3 are respectively located on both sides of the pipe 100. The push head 3 can move horizontally relative to the base plate 1 and enter the receiving groove to push the pipe 100 into the receiving groove for plastic deformation. That is, the moving direction of the push head 3 is consistent with the extension direction of the receiving groove. When the push head 3 moves into place, the bending of the pipe 100 is completed. At this time, the push head 3 moves in the opposite direction and withdraws from the receiving groove to facilitate the removal of the pipe 100 after the bending. The pipe bending die in this embodiment positions and supports the pipe 100 through the positioning assembly, and the push head 3 pushes the pipe 100 into the receiving groove when moving horizontally, so that the pipe 100 undergoes plastic deformation, and the pipe 100 is finally bent into the desired structure under the constraints of the push head 3 and the module 2. Since the push head 3 moves horizontally, there is no additional demand for the vertical space at the press machine during the molding process, and the positioning assembly is used to position and support the pipe 100, ensuring that the initial position of the pipe 100 is accurate, avoiding the situation where the local deformation of the pipe 100 does not match the material thickness due to the inaccurate position of the pipe 100 after sliding, thereby reducing the probability of wrinkles and depressions and reducing the scrap rate.

[0034] Further, the push head 3 can be fitted with the inner side wall of the receiving groove of the module 2, and the inner side wall of the receiving groove of the module 2 is also provided with a first molding groove 21 and a second molding groove 22, and the push head 3 is provided with a third molding groove 31, specifically referring to Figure 3-Figure 6 As shown. When the push head 3 is fitted with the inner wall of the receiving groove, the third molding groove 31 of the push head 3 and the first molding groove 21 and the second molding groove 22 on the inner wall of the receiving groove jointly form a molding space, and the molding space is used to accommodate the pipe 100. The groove wall shapes of the first molding groove 21, the second molding groove 22 and the third molding groove 31 match the corresponding external shape of the pipe 100, so as to provide a space for accommodating the pipe 100 during the molding process and further shape the pipe 100. At the same time, the push head 3 is fitted with the inner wall of the receiving groove, ensuring that the push head 3 is accurately positioned after moving into position, further improving the shape accuracy of the formed pipe 100, and further avoiding the occurrence of defects such as wrinkles and depressions.

[0035] Specifically, the module 2 includes two sub-blocks, and the two sub-blocks are fixedly connected to the bottom plate 1 by bolts. The two sub-blocks are provided with a first molding groove 21 and a second sub-molding groove. The two sub-blocks are buckled to form a receiving groove, and the second sub-molding grooves of the two sub-blocks together form a second molding groove 22. The pipe 100 in this embodiment forms an integrally formed shoulder cover and two fork legs after push bending. The first molding groove 21 corresponds to the fork leg, and the second molding groove 22 corresponds to the shoulder cover. Such a configuration reduces the process difficulty in the processing and manufacturing process of the module 2.

[0036] Alternatively, if Figure 3 As shown, the module 2 is also provided with an introduction portion 23, which is a rounded structure. The introduction portion 23 is arranged at one end of the groove wall of the first forming groove 21 away from the groove wall of the second forming groove 22, that is, the introduction portion 23 with a rounded structure is arranged at the opening position of the accommodating groove, so that the pipe fitting 100 can enter the accommodating groove more smoothly.

[0037] Furthermore, if Figure 5 As shown, a limiting groove 32 is provided at one end of the push head 3 close to the pipe 100, and the limiting groove 32 is a circular groove provided on the groove wall of the third forming groove 31. When the push head 3 pushes the pipe 100 into the receiving groove, the end of the push head 3 close to the pipe 100, i.e., the front end of the push head 3, first contacts the pipe 100 and provides thrust to the pipe 100. The part of the pipe 100 in contact with the push head 3 undergoes plastic deformation under the action of the thrust, accompanied by the flow of the material. The curvature of the part where the formed pipe 100 contacts the front end of the push head 3 is large, and the probability of wrinkles is higher. The setting of the limiting groove 32 allows a part of the material of the pipe 100 to flow into the limiting groove 32 during the forming process, thereby reducing the probability of wrinkles. At this time, part of the pipe 100 cooperates with the groove wall of the limiting groove 32, so that the groove wall of the limiting groove 32 plays a limiting role on the pipe 100, preventing the pipe 100 from sliding along its own extension direction during the push-bending forming process.

[0038] Furthermore, if Figure 1-Figure 6 As shown, a slide rail 11 is provided on the bottom plate 1, and the slide rail 11 and the receiving groove extend in the same direction. The push head 3 is provided with a slide groove 33, and is slidably connected to the slide rail 11 through the slide groove 33. The sliding fit of the slide groove 33 and the slide rail 11 ensures that the path of the push head 3 will not deviate during the movement, thereby ensuring the quality of the formed pipe 100. The end of the slide rail 11 can be set to a circular chamfer or a semicircular structure to facilitate the slide groove 33 to cooperate with it. The slide groove 33 and the slide rail 11 in this embodiment are set to a rectangular structure. In other embodiments, it can also be set to a dovetail structure to provide vertical constraints on the push head 3.

[0039] For further information, please refer to Figure 1-Figure 2As shown, the positioning assembly includes an extension plate 51, a clamping plate 52 and two guide blocks 4. The two guide blocks 4 are both mounted on the base plate 1 and are respectively located on both sides of the module 2. The guide blocks 4 extend in the horizontal direction approximately perpendicular to the moving direction of the push head 3. The guide blocks 4 are used to support the pipe fittings 100. The corresponding guide blocks 4 are provided with guide walls 41. The wall shape of the guide walls 41 matches the shape of the pipe fittings 100. One end of the extension plate 51 is mounted on the base plate 1, and the other end extends in a direction away from the base plate 1. In this embodiment, the extension plate 51 extends toward the side of the base plate 1, and its extension direction is parallel to the extension direction of the guide blocks 4. The clamping plate 52 is fixedly connected to one end of the extension plate 51 away from the base plate 1, and the clamping plate 52 is used to fit with one end of the pipe fitting 100. After the pipe 100 is loaded into the positioning assembly, the guide block 4 supports the pipe 100, and the push head 3 moves toward the inside of the receiving groove, pushing the middle part of the pipe 100 forward so that the pipe 100 contacts the inner wall of the receiving groove, and then the clamping plate 52 is fixedly connected to the extension plate 51, and at the same time fits with one end of the pipe 100, so that the pipe 100 cannot slide along its own extension direction, ensuring that the pipe 100 will not slide along its own extension direction when the pipe 100 is pushed and bent. During the process of pushing and bending the pipe 100, part of the material of the pipe 100 flows into the limiting groove 32 of the push head 3, thereby preventing the pipe 100 from sliding along its own extension direction during the process of pushing and bending, so that the pipe 100 will not slide along its own extension direction during the whole process of pushing and bending. It should be pointed out that before the pipe fitting 100 is pushed and bent, its middle part has a certain protrusion after the previous process. Therefore, under the push of the push head 3, the middle part of the pipe fitting 100 can first contact and fit tightly with the inner wall of the receiving groove, and also fit tightly with the guide wall 41 of the guide block 4. At this time, the clamping plate 52 fits with one end of the pipe fitting 100, so that the pipe fitting 100 is positioned under the joint action of the guide block 4, the module 2, the push head 3 and the clamping plate 52. The processing technology and related structures of the pipe fitting 100 before push bending are the existing technology in this field. For example, the tubular blank can be obtained by the processes of oblique pipe drawing, beveling and flattening in the existing technology. Figure 1 The pipe 100 shown in FIG. 1 is not formed by push bending.

[0040] Optionally, an adjustment hole 521 is provided on the clamping plate 52, and the adjustment hole 521 is an oblong hole, and the adjustment hole 521 extends along the length direction of the extension plate 51, and a fastener passes through the adjustment hole 521 to fix the clamping plate 52 with the extension plate 51. The clamping plate 52 is an L-shaped plate, a part of which is used to be fixedly connected to the extension plate 51, and the other part is used to fit with one end of the pipe 100. By providing the adjustment hole 521, the position of the clamping plate 52 on the extension plate 51 is changed, so as to meet the positioning requirements of pipes 100 of different sizes.

[0041] Optionally, the push head 3 can be made of a material having certain elasticity and self-lubricating properties, such as polyoxymethylene, polyketone, polyethylene or nylon. In this embodiment, the push head 3 is preferably made of polyoxymethylene. Polyoxymethylene has good self-lubricating properties and certain elasticity, and can further reduce the probability of wrinkles on the pipe 100 during the push-bending process of the pipe 100.

[0042] The present invention provides a pipe bending device, comprising a machine platform and a pipe bending die in this embodiment, wherein a bottom plate 1 is mounted on the machine platform. By using the pipe bending die of the present invention, the vertical height requirement of the machine platform is reduced, and the scrap rate of the processed pipe 100 is reduced.

[0043] The present invention provides a pipe bending method, which uses the pipe bending die in this embodiment to bend a pipe 100. The pipe bending method includes:

[0044] Position and support the pipe 100 on the positioning assembly and between the module 2 and the pusher head 3;

[0045] The push head 3 moves horizontally to push the pipe 100 into the receiving groove of the module 2, so that the pipe 100 undergoes plastic deformation;

[0046] The push head 3 moves in the opposite direction to leave the receiving groove, and takes out the pipe 100 after being pushed and bent.

[0047] When the push head 3 pushes the pipe 100 into the receiving groove of the module 2, the feeding speed of the push head 3 does not exceed the preset value to avoid wrinkles or pits on the pipe 100 caused by excessive feeding speed. The feeding speed of the push head 3 is determined according to the aluminum alloy grade used for the pipe 100 and the specifications of the pipe 100, and is not specifically limited here. By using the pipe bending die of the present invention to push and bend the pipe 100, the probability of wrinkles and pits on the pipe 100 after forming is reduced, and the scrap rate is reduced.

[0048] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. Pipe bending die, characterized in that: include: Bottom plate (1); A module (2), the module (2) being fixedly connected to the base plate (1), and the module (2) being provided with a receiving groove; A positioning assembly, the positioning assembly being mounted on the base plate (1), and the positioning assembly being used to position and support the pipe fitting (100); A push head (3), wherein the module (2) and the push head (3) are respectively located on two sides of the pipe (100), and the push head (3) can move in a horizontal direction relative to the base plate (1) and enter the receiving groove to push the pipe (100) into the receiving groove to undergo plastic deformation.

2. The pipe bending die according to claim 1, characterized in that: The push head (3) is capable of fitting with the inner side wall of the receiving groove of the module (2); the inner side wall of the receiving groove of the module (2) is also provided with a first molding groove (21) and a second molding groove (22); the push head (3) is provided with a third molding groove (31); the third molding groove (31) together with the first molding groove (21) and the second molding groove (22) form a molding space; the molding space is used to accommodate the pipe (100).

3. The pipe bending die according to claim 2, characterized in that: The module (2) comprises two sub-blocks, both of which are fixedly connected to the base plate (1), both of which are provided with the first molding groove (21) and the second sub-molding groove, the two sub-blocks jointly form the accommodating groove when the two sub-blocks are buckled together, and the second sub-molding grooves of the two sub-blocks jointly form the second molding groove (22).

4. The pipe bending die according to claim 2, characterized in that: The module (2) is further provided with an introduction portion (23), the introduction portion (23) being a rounded structure, and the introduction portion (23) being provided at an end of the groove wall of the first forming groove (21) away from the groove wall of the second forming groove (22).

5. The pipe bending die according to claim 1, characterized in that: A limiting groove (32) is provided at one end of the push head (3) close to the pipe (100); when the push head (3) pushes the pipe (100) into the receiving groove, a portion of the pipe (100) cooperates with the groove wall of the limiting groove (32).

6. The pipe bending die according to claim 1, characterized in that: The bottom plate (1) is provided with a slide rail (11), the slide rail (11) and the accommodating groove extend in the same direction, and the push head (3) is provided with a slide groove (33) and is slidably connected to the slide rail (11) via the slide groove (33).

7. The pipe bending die according to claim 1, characterized in that: The positioning assembly comprises an extension plate (51), a clamping plate (52) and two guide blocks (4); the two guide blocks (4) are both mounted on the base plate (1) and are respectively located on both sides of the module (2); the guide blocks (4) are used to support the pipe fitting (100); one end of the extension plate (51) is mounted on the base plate (1) and the other end extends in a direction away from the base plate (1); the clamping plate (52) is fixedly connected to one end of the extension plate (51) away from the base plate (1); and the clamping plate (52) is used to fit with one end of the pipe fitting (100).

8. The pipe bending die according to claim 7, characterized in that: The clamping plate (52) is provided with an adjustment hole (521), the adjustment hole (521) extends along the length direction of the extension plate (51), and a fastener passes through the adjustment hole (521) to fix the clamping plate (52) and the extension plate (51) together.

9. The pipe bending die according to any one of claims 1 to 8, characterized in that: The pusher head (3) is made of polyoxymethylene, polyketone, polyethylene or nylon.

10. A pipe bending method, characterized in that: A pipe (100) is bent using the pipe bending die according to any one of claims 1 to 9, wherein the pipe bending method comprises: Positioning and supporting the pipe fitting (100) on the positioning assembly and locating the pipe fitting (100) between the module (2) and the pusher head (3); The push head (3) moves horizontally to push the pipe fitting (100) into the receiving groove of the module (2), so that the pipe fitting (100) undergoes plastic deformation.

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