Pressing tooling

Abstract

This utility model relates to the field of fastener manufacturing technology and provides a forming tool. This forming tool is used to press bar stock into U-shaped bolt semi-finished products. It includes a base, two forming parts spaced apart on the base, and a forming part arranged opposite to the base. The forming part moves relative to the base with an external press, pressing the middle part of the bar stock into the space enclosed by the base and the two forming parts. Both ends of the bar stock are restricted by the two forming parts, allowing them to be bent and abut against the sides of the forming part. The forming part has a pressing surface on the side facing the base that can press against the middle part. Both sides of the pressing surface have rounded corners to form the bent portions on the corresponding sides of the bar stock. This forming tool improves the forming quality of U-bolts.

Description

Technical Field

[0001] This utility model relates to the field of fastener manufacturing technology, and in particular to a forming tool. Background Technology

[0002] U-bolts are a common type of fastener, widely used in pipe fixing, mechanical equipment, and other fields. Based on their structural shape, U-bolts are mainly divided into two basic types: "U"-shaped and "U"-shaped. Among them, the "U"-shaped structure has irreplaceable advantages in certain specific applications due to its special design.

[0003] In manufacturing practice, many manufacturers often choose to produce U-bolts in small batches to reduce production costs. The currently widely used hot bending forming process, while simple to operate, has significant technical limitations in practical applications. When processing U-shaped structures, the uncertainty of material expansion and contraction during hot bending makes it difficult to control the inner angle dimensions of the U-bolt, hindering the improvement of its forming quality. Utility Model Content

[0004] In view of this, the present invention aims to provide a forming tool to improve the forming quality of U-bolts.

[0005] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0006] A forming tool for forming a bar stock into a U-shaped bolt semi-finished product, comprising a base, two forming parts spaced apart on the base, and a forming part arranged opposite to the base;

[0007] The pressing part moves relative to the base with the external press, and can press the middle part of the bar into the space enclosed by the base and the two forming parts. The two ends of the bar are respectively restricted by the two forming parts, and can be bent and abut against the two sides of the pressing part.

[0008] The forming part has a pressing surface on the side facing the base that can press against the middle part; both sides of the pressing surface have rounded corners to form the bending parts of the corresponding sides of the bar.

[0009] Furthermore, each of the molding parts includes a mounting base disposed on the base and a roller rotatably connected to the mounting base;

[0010] The two rollers are arranged with their central axes parallel, and each roller pushes the bar stock through its outer peripheral surface.

[0011] Furthermore, each of the rollers has a limiting groove on its outer circumferential surface, which allows a portion of the bar stock to be embedded.

[0012] Furthermore, the position of each of the molding parts on the base along a preset direction is adjustable, so that the two molding parts can move closer to or further away from each other;

[0013] The base is provided with a limiting part corresponding to each of the molding parts. The limiting part can block one side of the corresponding molding part to limit the extreme position of the two molding parts on the base.

[0014] Furthermore, the limiting part is detachably mounted on the base.

[0015] Furthermore, the forming section includes a connecting seat for connecting to an external press, and a pressing head detachably connected to the connecting seat, the forming section pressing the bar stock through the pressing head.

[0016] Furthermore, the molding part is provided with a strip-shaped hole extending along the preset direction, and the molding part is fixed to the base by bolts passing through the strip-shaped hole.

[0017] Furthermore, a guide structure is provided between the pressure head and the connecting seat. The guide structure can guide the pressure head to slide relative to the connecting seat along the sliding direction of the forming part, and the pressure head that has slid to a preset position is fixed on the connecting seat by fasteners.

[0018] Furthermore, the fastener includes a set screw.

[0019] Furthermore, the base is provided with a raised area that protrudes towards the forming part, and the pressing surface is provided with a recessed area corresponding to the raised area. The raised area and the recessed area can jointly squeeze the bar stock, causing the middle part of the bar stock to be partially concave.

[0020] Furthermore, the base includes a base body and a detachable pad disposed on the base body. The base contacts the bar stock through the pad, and the protruding area is disposed on the pad.

[0021] Compared with the prior art, this utility model has the following advantages:

[0022] The forming fixture described in this utility model uses a press to drive the forming part to press the middle part of the bar into the space formed by the base and two forming parts, so that the two ends of the bar can be bent along the forming part and then bend into a "U" shape. The pressing part has rounded corners on both sides of the pressing surface, which can guide the bending of the bar and make the inner rounded corner of the bolt semi-finished product better controlled, which is conducive to improving the forming quality of U bolts.

[0023] Secondly, by using rollers that contact the bar stock, the friction during forming is significantly reduced compared to a fixed mold. The rollers also guide the bending of the bar stock, preventing scratches. The limiting grooves restrict the bar stock's movement perpendicular to its bending plane, ensuring its position on the rollers remains stable during the pressing process into a bolt semi-finished product. By making the forming section adjustable along a preset direction and limiting its position, the forming fixture can be adapted to accommodate U-bolts of different widths.

[0024] Furthermore, the limiting part is detachably mounted on the base. In practice, different limiting parts can be replaced to accommodate the production of U-bolts of different specifications. A connecting seat connected to the press, and a pressure head that can be detachably connected to the connecting seat, allow for adaptation when producing U-bolts of different widths by simply changing the pressure head, enabling the same connecting seat to be used for multiple specifications of U-bolts. The strip-shaped hole in the forming part allows for adjustment of the forming part's position without removing the bolts, and also acts as a guide during adjustment, reducing positional deviation of the forming part on the base in the direction perpendicular to the strip-shaped hole.

[0025] Furthermore, a guide structure is installed between the press head and the connecting seat, which facilitates the adjustment of the press head in a preset direction. Fasteners can be used to quickly fix the press head, improving the adjustment efficiency of the forming tooling. Using set screws as fasteners allows for stepless adjustment and quick locking of the press head position.

[0026] In addition, the raised area on the base and the recessed area on the pressing surface allow the forming part and the base to press the center of the bolt semi-finished product into a concave shape, facilitating subsequent shaping of the bolt semi-finished product. By placing the raised area on the pad, the degree of concavity in the center of the bolt semi-finished product can be flexibly adjusted by replacing pads with different raised specifications, adapting to different U-bolt models. This allows a single base to accommodate multiple U-bolt specifications. Furthermore, the detachable design of the pad, as a component in direct contact with the bar stock, facilitates quick replacement after wear, preventing overall scrapping due to wear of the base body and reducing tooling maintenance costs. Attached Figure Description

[0027] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0028] Figure 1 This is a schematic diagram of the forming tooling described in an embodiment of the present invention;

[0029] Figure 2This is a schematic diagram of the molding part according to an embodiment of the present utility model;

[0030] Figure 3 This is a schematic diagram of the pressing part according to an embodiment of the present utility model.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1. Base;

[0033] 101. Edge guard; 102. Raised area; 103. Pad;

[0034] 2. Molding section;

[0035] 201. Connecting seat; 202. Press head; 2021. Guide rail; 2022. Pressing surface; 2023. Recessed area; 2024. Rounded corner;

[0036] 3. Molding section;

[0037] 301, Mounting base; 3011, Strip hole; 302, Roller; 3021, Limiting groove;

[0038] 4. Limiting part;

[0039] 5. Fasteners;

[0040] 6. Bolts;

[0041] 7. Semi-finished bolts. Detailed Implementation

[0042] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0043] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0044] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" appear, indicating orientation or positional relationship, they are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, if terms such as "first" or "second" appear, they are also used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0045] Furthermore, in the description of this utility model, unless otherwise explicitly defined, the terms "installation," "connection," "joining," and "connector" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model in light of the specific circumstances.

[0046] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0047] U-bolts are a common type of fastener, widely used in pipe fixing, mechanical equipment, and other fields. Based on their structural shape, U-bolts are mainly divided into two basic types: "U"-shaped and "U"-shaped. Among them, the "U"-shaped structure has irreplaceable advantages in certain specific applications due to its special design.

[0048] In manufacturing practice, many manufacturers often choose to produce U-bolts in small batches to reduce production costs. The currently widely used hot bending forming process, while simple to operate, has significant technical limitations in practical applications. When processing U-shaped structures, the uncertainty of material expansion and contraction during hot bending makes it difficult to control the inner angle dimensions of the U-bolt, hindering the improvement of its forming quality.

[0049] This embodiment relates to a forming tool to improve the forming quality of U-bolts.

[0050] In terms of overall structure, refer to Figures 1 to 3 As shown, the forming tool in this embodiment is used to press the bar stock into a bolt semi-finished product 7 in the shape of "U". It includes a base 1, two forming parts 3 spaced apart on the base 1, and a forming part 2 arranged opposite to the base 1.

[0051] The pressing section 2 moves relative to the base 1 with the external press, and can press the middle part of the bar into the space enclosed by the base 1 and the two forming sections 3. The two ends of the bar are respectively restricted by the two forming sections 3, and can be bent and abut against the two sides of the pressing section 2.

[0052] The forming part 2 has a pressing surface 2022 on the side facing the base 1, which can press against the middle part. Both sides of the pressing surface 2022 are provided with rounded corners 2024 to form the bent parts on the corresponding sides of the bar material.

[0053] As described above, the forming fixture in this embodiment uses a press to drive the forming part 2 to press the middle part of the bar stock into the space formed by the base 1 and the two forming parts 3, so that both ends of the bar stock can be bent along the forming part 2 and thus be bent into a "U" shape. The forming fixture in this embodiment can use cold pressing or hot pressing processes, which is beneficial to improving the forming quality of the U-bolt; at the same time, the rounded corners 2024 on both sides of the pressing surface 2022 of the forming part 2 can guide the bending of the bar stock, so that the size control of the inner rounded corners 2024 of the bolt semi-finished product 7 is better, which is also beneficial to improving the forming quality of the U-bolt.

[0054] Based on the above overview, specifically, the forming fixture of this embodiment is used for the production of U-bolts. It can press bar stock into a U-shaped bolt semi-finished product 7, and then obtain the finished U-bolt through processes such as shaping and rust prevention. When using the forming fixture of this embodiment, the two ends of the bar stock have been machined with external threads. Because the forming part 2 in the forming fixture of this embodiment adopts a combined structure, that is, the side is stepped, it can avoid the threaded part from contacting the fixture during forming, and does not affect the external thread structure on the bar stock. The forming part 2 is connected to the pressure application end of the press, and the movement of the forming part 2 is realized by the drive of the press, thus completing the extrusion of the bar stock.

[0055] In this embodiment, each forming part 3 includes a mounting base 301 mounted on the base 1 and rollers 302 rotatably connected to the mounting base 301. The central axes of the two rollers 302 are parallel, and each roller 302 pushes the bar stock through its outer peripheral surface. By setting the rollers 302 and having them contact the bar stock, the friction during forming can be significantly reduced compared to a fixed mold. At the same time, the rollers 302 can guide the bending of the bar stock and prevent it from being scratched.

[0056] Preferably, to enhance the force interaction between the rollers 302 and the bar stock, each roller 302 in this embodiment is provided with a limiting groove 3021 on its outer circumferential surface. The limiting groove 3021 allows a portion of the bar stock to be embedded. The limiting groove 3021 restricts the swaying of the bar stock perpendicular to its bending plane, making it less prone to deviation from its position on the rollers 302 during the pressing process into the bolt semi-finished product 7, resulting in a more stable forming process. Specifically, in this embodiment, the limiting groove 3021 has a semi-circular cross-section, which can accommodate bar stock of various diameters.

[0057] Secondly, to improve the applicability of the forming fixture to U-bolts of different specifications, the position of each forming part 3 on the base 1 is adjustable along a preset direction, allowing the two forming parts 3 to move closer or further apart. The base 1 is provided with a limiting part 4 corresponding to each forming part 3. The limiting part 4 can block one side of the corresponding forming part 3, limiting the extreme positions of the two forming parts 3 on the base 1. By setting the forming parts 3 to be adjustable along a preset direction and limiting their position with the limiting part 4, the forming fixture can be adapted to U-bolts of different widths by adjusting the position of the forming parts 3. The preset direction is the axial extension direction of the bar stock before forming; adjusting the distance between the two forming parts 3 according to the preset direction changes the width of the bolt semi-finished product 7.

[0058] Furthermore, the limiting part 4 is detachably mounted on the base 1. By detachably mounting the limiting part 4 on the base 1, different specifications and models of U-bolts can be adapted by replacing different limiting parts 4 in actual implementation.

[0059] Specifically, in this embodiment, the base 1 has side flanges 101 on both sides in a preset direction. The limiting part 4 is a cuboid block placed on the base 1, with its two sides abutting against the side flanges 101 and the forming part 3, respectively. When the forming part 2 extrudes the bar stock, part of the pushing force of the bar stock on the forming part 3 is transmitted to the side flanges 101 through the limiting part 4, so that the forming part 3 will not exceed its limit position. Of course, the limiting part 4 can also be connected to the base 1 by means of, for example, bolts, as long as it can block the forming part 3 to limit the maximum distance between the two forming parts 3.

[0060] Furthermore, regarding the specific structure of the molding part 3 on the base 1 to achieve positional adjustability, in this embodiment, the molding part 3 is provided with a strip-shaped hole 3011 extending along a preset direction. The molding part 3 is fixed to the base 1 by bolts 6 passing through the strip-shaped hole 3011. The strip-shaped hole 3011 of the molding part 3 allows for adjustment of the position of the molding part 3 without removing the bolts 6, and also serves as a guide during the adjustment process, reducing the positional deviation of the molding part 3 on the base 1 in the direction perpendicular to the strip-shaped hole 3011. In this embodiment, the mounting base 301 is provided with four strip-shaped holes 3011, each corresponding to one bolt 6.

[0061] Regarding the specific structure of the forming section 2, in this embodiment, the forming section 2 includes a connecting seat 201 for connecting to an external press, and a pressing head 202 detachably connected to the connecting seat 201. The forming section 2 pushes the bar stock through the pressing head 202. By providing a connecting seat 201 connected to the press and a pressing head 202 detachably connected to the connecting seat 201, it is possible to adapt to the production of U-bolts of different widths by simply changing the pressing head 202, thus enabling the same connecting seat 201 to be used for multiple specifications of U-bolts. The pressing head 202 has its two side walls arranged parallel to each other in a preset direction, allowing the two ends of the bolt semi-finished product 7 to abut against it.

[0062] Meanwhile, to facilitate adjustment of the relative position between the pressure head 202 and the connecting seat 201, a guide structure is provided between the pressure head 202 and the connecting seat 201 in this embodiment. The guide structure can guide the pressure head 202 to slide relative to the connecting seat 201 along the sliding direction of the forming part 3, and the pressure head 202, after sliding to a preset position, is fixed to the connecting seat 201 by fasteners 5. The guide structure between the pressure head 202 and the connecting seat 201 facilitates the adjustment of the pressure head 202 in a preset direction, and the fasteners 5 can quickly fix the pressure head 202, improving the adjustment efficiency of the forming tooling.

[0063] Specifically, the guiding structure consists of a guide rail 2021 mounted on the pressure head 202 and a sliding groove mounted on the connecting seat 201. The fastener 5 includes a set screw. The guide rail 2021 ensures greater stability for the pressure head 202 as it slides on the connecting seat 201; alternatively, a guide structure using a guide rod and guide hole would also be acceptable. The set screw is screwed onto the connecting seat 201, with one end inserted into the sliding groove. After the pressure head 202 is in position, tightening the set screw secures it to the guide rail 2021, thus fixing the pressure head 202 relative to the connecting seat 201. Using a set screw as the fastener 5 allows for stepless adjustment and quick locking of the pressure head 202's position. It is understood that other types of fasteners 5, such as hex socket head cap screws, could also be used.

[0064] In addition, the pressure head 202 has a predetermined assembly position relative to the connecting seat 201. The predetermined assembly position is the position where the pressure head 202 is located in the middle between the two forming parts 3. During the process of the pressure head 202 extruding the bar stock, the distance between the pressure head 202 and the forming parts 3 on both sides is the same, making the two bent parts of the bolt semi-finished product 7 more symmetrical.

[0065] Furthermore, because the bolt semi-finished product 7 obtained after pressing the bar stock will have a springback problem, meaning that there is an included angle between the two ends of the bolt semi-finished product 7 after forming the opening, making the bolt semi-finished product 7 actually flared, it is necessary to reshape the bolt semi-finished product 7. The reshaping method is to squeeze the two ends of the bolt semi-finished product 7 from the outside to make the two ends of the bolt semi-finished product 7 parallel. However, the middle part of the bolt semi-finished product 7 will also bend accordingly, affecting the finished quality of the U-bolt.

[0066] In this embodiment, the base 1 has a raised area 102 that protrudes towards the pressing part 2, and the pressing surface 2022 has a recessed area 2023 corresponding to the raised area. The raised area 102 and the recessed area 2023 can jointly compress the bar stock, causing the middle part of the bar stock to be partially concave. The raised area 102 on the base 1 and the recessed area 2023 on the pressing surface 2022 enable the pressing part 2 and the base 1 to press the middle part of the bolt semi-finished product 7 into a concave shape, that is, the middle part of the bolt semi-finished product 7 is concave towards the inside of its opening. When shaping the bolt semi-finished product 7, its two ends are pressed inward, and the middle part will gradually straighten under the action of force, offsetting the deformation effect of the middle part when the two ends are pressed, making the shaping more convenient.

[0067] Preferably, the base 1 includes a base 1 body and a detachable pad 103 disposed on the base 1 body. The base 1 contacts the bar stock through the pad 103, and a raised area 102 is disposed on the pad 103. By placing the raised area 102 on the pad 103, the concavity of the middle part of the bolt semi-finished product 7 can be flexibly adjusted by replacing pads 103 with different raised specifications, adapting to different U-bolt models. This allows a single base 1 to adapt to multiple U-bolt specifications. At the same time, as a component that directly contacts the bar stock, the detachable design of the pad 103 facilitates quick replacement after wear, avoiding overall scrapping due to wear of the base 1 body and reducing the maintenance cost of the tooling.

[0068] In detail, the base 1 has a groove into which the pad 103 can be fitted. The pad 103 can be made of a material with better wear resistance (such as tool steel), forming a material differentiation configuration with the main body of the base 1 (such as ordinary carbon steel), which improves the service life of key contact parts while ensuring overall strength. Correspondingly, the pressure head 202 and the roller 302 can also be made of a material with better wear resistance (such as tool steel), improving the overall service life of the forming tooling.

[0069] The method of using the forming fixture in this embodiment is as follows: First, install the connecting seat 201 on the press, install the base 1 on the work platform, and screw the bolt 6 through the strip hole 3011 to the base 1 without tightening it; Second, place the limiting part 4 against the side 101, use the mounting seat 301 to press the limiting part 4 against the side 101, and tighten the bolt 6 in place; Then, install the pressing head 202 onto the connecting seat 201, adjust the position of the pressing head 202 to be aligned with the center between the two rollers 302, and tighten the set screw; Finally, place the bar stock in the center on the two rollers 302, and start the press to perform the forming operation on the bar stock.

[0070] The forming fixture in this embodiment uses a press to drive the forming section 2 to press the middle part of the bar stock into the space formed by the base 1 and two forming sections 3. This allows the two ends of the bar stock to bend along the forming section 2, thus forming a "U" shape. Both cold pressing and hot pressing processes can be used, both of which can replace hot bending processes, improving the forming quality of the U-bolt. Furthermore, the forming fixture can accommodate various specifications and models of U-bolts, making it widely applicable.

[0071] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A forming tool for pressing bar stock into a U-shaped bolt semi-finished product (7), characterized in that: It includes a base (1), two forming parts (3) spaced apart on the base (1), and a pressing part (2) arranged opposite to the base (1); The pressing part (2) moves relative to the base (1) with the external press, and can press the middle part of the bar into the space enclosed by the base (1) and the two forming parts (3). The two ends of the bar are respectively restricted by the two forming parts (3), and can be bent and attached to both sides of the pressing part (2). The forming part (2) has a pressing surface (2022) on the side facing the base (1) that can press against the middle part; both sides of the pressing surface (2022) are provided with rounded corners (2024) to form the bending parts of the corresponding sides of the bar respectively.

2. The forming tooling according to claim 1, characterized in that: Each of the molding parts (3) includes a mounting base (301) disposed on the base (1) and a roller (302) rotatably connected to the mounting base (301); The two rollers (302) are arranged in parallel along their central axes, and each roller (302) pushes the bar stock against its outer peripheral surface.

3. The forming tooling according to claim 2, characterized in that: Each of the rollers (302) has a limiting groove (3021) on its outer peripheral surface, and the limiting groove (3021) can allow a portion of the bar stock to be embedded.

4. The forming tooling according to claim 1, characterized in that: The position of each of the molding parts (3) on the base (1) along a preset direction is adjustable, so that the two molding parts (3) can move closer to or further away from each other; The base (1) is provided with a limiting part (4) corresponding to each of the molding parts (3). The limiting part (4) can block one side of the corresponding molding part (3) to limit the extreme position of the two molding parts (3) on the base (1).

5. The forming tooling according to claim 4, characterized in that: The limiting part (4) is detachably mounted on the base (1).

6. The forming tooling according to claim 4, characterized in that: The forming section (2) includes a connecting seat (201) for connecting to an external press, and a pressing head (202) detachably connected to the connecting seat (201), wherein the forming section (2) presses the bar stock through the pressing head (202); and / or, The forming part (3) is provided with a strip hole (3011) extending along the preset direction, and the forming part (3) is fixed to the base (1) by a bolt (6) passing through the strip hole (3011).

7. The forming tooling according to claim 6, characterized in that: A guide structure is provided between the pressure head (202) and the connecting seat (201). The guide structure can guide the pressure head (202) to slide relative to the connecting seat (201) along the sliding direction of the forming part (3). The pressure head (202) that has slid to a preset position is fixed on the connecting seat (201) by a fastener (5).

8. The forming tooling according to claim 7, characterized in that: The fastener (5) includes a set screw.

9. The forming tooling according to any one of claims 1 to 8, characterized in that: The base (1) is provided with a raised area (102) that protrudes toward the forming part (2), and the pressing surface (2022) is provided with a recessed area (2023) corresponding to the raised area. The raised area (102) and the recessed area (2023) can jointly squeeze the bar material, so that the middle part of the bar material is partially concave.

10. The forming tooling according to claim 9, characterized in that: The base (1) includes a base (1) body and a detachable pad (103) disposed on the base (1) body. The base (1) contacts the bar stock through the pad (103), and the protrusion area (102) is disposed on the pad (103).

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