Dovetail butt joint based round pipe stamping and bending mechanism

Abstract

The utility model discloses a kind of round pipe piece stamping bending mechanism based on dovetail butt joint, including lower mould, its top is equipped with the arc-shaped gap for supporting round pipe piece product, the two sides of arc-shaped gap are equipped with the inclined plane of height gradually low;First material punch rod, it is set in the upper of lower mould, its bottom is equipped with first slope and first inner concave surface, first slope is correspondingly set with the inclined plane of lower mould side;Second material punch rod, it is set in the upper of lower mould with first material punch rod parallel, its bottom is equipped with second slope and second inner concave surface, second slope is correspondingly set with the inclined plane of lower mould other side;Arc-shaped gap, first inner concave surface, second inner concave surface can form the round hole of clamping round pipe piece product;The butt joint of round pipe piece product is mutually assembled by dovetail tenon and dovetail groove;First material punch rod and second material punch rod each independently have lifting freedom degree. Adopt the utility model by dovetail tenon groove cooperation and independent lifting material punch rod, realize the stable forming of round pipe piece bending.

Description

Technical Field

[0001] This utility model relates to the field of stamping and bending technology, specifically to a stamping and bending mechanism for round tubes based on dovetail joints. Background Technology

[0002] In the field of round tube stamping and bending, existing technologies mostly rely on conventional butt joint structures to complete the stamping and bending operation, using simple positioning and pressure to achieve the preset shape. However, these traditional technical solutions have some limitations. For example, positioning deviations are prone to occur during the butt joint process, making it difficult to control the bending accuracy. Furthermore, the butt joint stability is insufficient due to differences in the material and size of the round tubes, which not only increases the rejection rate but also limits its adaptability to processing different specifications of tubes. At the same time, the conventional structural design has poor transmission of stamping pressure, which can easily cause local deformation of the tubes, making it difficult to meet the current precision manufacturing requirements for the quality and efficiency of round tube processing. Therefore, there is a need to provide new stamping and bending mechanisms for the butt joint of round tubes. Utility Model Content

[0003] The problem to be solved by this utility model is to provide a stamping and bending mechanism for round tubes based on dovetail joints.

[0004] To solve the above problems, this utility model provides a dovetail joint-based stamping and bending mechanism for round tubes. To achieve the above objectives, the technical solution adopted by this utility model to solve its technical problems is as follows: A dovetail joint-based stamping and bending mechanism for round tubes includes: a lower die with an arc-shaped notch at its top for supporting the round tube product, and gradually decreasing slopes on both sides of the arc-shaped notch; a first punch rod disposed above the lower die, with a first slope and a first concave surface at its bottom, the first slope corresponding to one slope of the lower die; and a second punch rod disposed parallel to the first punch rod above the lower die, with a second slope and a second concave surface at its bottom, the second slope corresponding to the other slope of the lower die; wherein the arc-shaped notch, the first concave surface, and the second concave surface can form a circular opening for clamping the round tube product; the butt joint of the round tube product is assembled with dovetail tenons and dovetail grooves; the first punch rod and the second punch rod each have independent lifting freedom, so that the first slope and the second slope at their bottoms can slide and engage with the slopes respectively, and the shapes of the first concave surface and the second concave surface match the dovetail tenon and the dovetail groove to be formed respectively.

[0005] As a further improvement of this utility model, the bottom of the first punching rod is provided with a first rectangular pit, and the bottom of the second punching rod is provided with a second rectangular pit, and the first rectangular pit and the second rectangular pit can communicate with each other.

[0006] As a further improvement of this utility model, it also includes a first inlay block and a second inlay block, wherein the first inlay block is detachably connected to the first rectangular pit and the second inlay block is detachably connected to the second rectangular pit.

[0007] As a further improvement of this utility model, the first and second inlay blocks are made of cemented carbide.

[0008] As a further improvement of this utility model, the radius of the arc-shaped notch is adapted to the radius of the outer wall of the circular tube product.

[0009] As a further improvement of this utility model, the first slope, the second slope and their respective corresponding inclined surfaces have the same inclination angle.

[0010] As a further improvement of this utility model, the central angle corresponding to the arc-shaped notch is 180°, and the central angles corresponding to the first concave surface and the second concave surface are both 90°.

[0011] As a further improvement of this utility model, the lower mold has a horizontally oriented hollow hole inside, which is located directly below the arc-shaped notch.

[0012] As a further improvement of this utility model, it also includes a push rod and a spring. The lower die, the first punch rod, and the second punch rod are each provided with a push rod, and one end of the push rod is assembled with a spring.

[0013] The beneficial technical effects of the dovetail joint-based round tube stamping and bending mechanism of this application are: By forming a circular opening that fits the outer wall of the round tube through the arc-shaped notch and the first and second concave curved surfaces, and with the corresponding sliding fit of the slope and inclined surface, the positioning deviation during docking is effectively avoided, and the bending processing accuracy of the round tube is significantly improved.

[0014] By utilizing the dovetail tenon and dovetail groove assembly structure, combined with the precise force application brought by the independent lifting of the punch rod, the stability of the round tube fitting docking process is enhanced, the assembly loosening problem caused by material or size differences is reduced, and the processing defect rate is lowered.

[0015] The independent lifting design of each punch bar, combined with the sliding mechanism of the slope, allows the punching force to be evenly transmitted to the round tube, avoiding excessive local deformation. At the same time, it adapts to the forming requirements of round tubes of different specifications, better meeting the requirements of precision manufacturing for processing quality. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is an application diagram of one embodiment of the present invention; Figure 2 This is a perspective view of the lower mold and the product according to one embodiment of this utility model; Figure 3 This is a perspective view of a product according to one embodiment of the present utility model; Figure 4 This is a perspective view of the first punch rod and the second punch rod according to one embodiment of the present invention; Figure 5 This is a perspective view of the first punch rod and the second punch rod according to one embodiment of the present invention; Figure 6 This is a perspective view of the first punching rod and the product according to one embodiment of this utility model.

[0018] 1-Lower mold; 11-Arc-shaped notch; 12-Sloped surface; 13-Hollow hole; 2-First punch rod; 21-First slope; 22-First concave curved surface; 23-First rectangular pit; 3-Second punch rod; 31-Second slope; 32-Second concave curved surface; 33-Second rectangular pit; 203-Mating seam; 4-Round tube product; 41-C-shaped segment; 42-Butt joint; 43-Dovetail groove; 44-Dovetail tenon; 5-Push rod; 6-Spring; 7-First insert block; 8-Second insert block. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to specific embodiments: To achieve the purpose of this utility model, a dovetail joint-based round tube stamping and bending mechanism includes: a lower die 1, the top of which has an arc-shaped notch 11 for supporting the round tube product 4, and the two sides of the arc-shaped notch 11 have gradually decreasing slopes 12. A first punch 2 is disposed above the lower die 1, and its bottom has a first slope 21 and a first concave curved surface 22, the first slope 21 corresponding to the slope 12 on one side of the lower die 1. A second punch 3 is disposed parallel to the first punch 2 above the lower die 1, and its bottom has a second slope 31 and a second concave curved surface 32, the second slope 31 corresponding to the slope 12 on the other side of the lower die 1. The arc-shaped notch 11, the first concave curved surface 22, and the second concave curved surface 32 can form a circular opening for clamping the round tube product 4. The butt joint 42 of the round tube product 4 is assembled with each other by a dovetail tenon 44 and a dovetail groove 43. The first punch rod 2 and the second punch rod 3 each have independent lifting freedom. The first punch rod 2 and the second punch rod 3 are parallel to each other and fit together to form a fitting seam 203. This allows the first slope 21 and the second slope 31 at their bottom to slide and engage with the inclined surface 12, and the shapes of the first concave curved surface 22 and the second concave curved surface 32 are respectively matched with the dovetail tenon 44 and the dovetail groove 43 to be formed.

[0020] like Figure 3 As shown, the round tube product 4 includes a C-shaped segment 41, with a butt joint 42 formed between the two ends of the C-shaped segment 41. Each end has a dovetail tenon 44 and a dovetail groove 43. The dovetail tenon 44 and the dovetail groove 43 interlock to ensure that the round tube product 4 becomes a structurally stable round tube workpiece.

[0021] like Figure 3 As shown, before the dovetail tenon 44 and the dovetail groove 43 are assembled, the dovetail tenon 44 is first bent outward radially. That is, during the round tube product 4, the dovetail tenon 44 is first bent in the opposite direction for compensation, and then the dovetail tenon 44 is separately snapped into the female end. A separate step is required to snap the dovetail into the female end, making the snap-fit ​​dovetail structure more stable, which is suitable for precision rounding of thin materials with small diameters.

[0022] The beneficial effects of adopting the above technical solution are as follows: the arc-shaped notch 11 of the lower die 1, together with the first concave curved surface 22 and the second concave curved surface 32, forms a circular opening that covers the round tube product 4. With the sliding of the first slope 21, the second slope 31 and the inclined surface 12, the precise positioning and bending guidance of the round tube are achieved, effectively avoiding the offset of the butt joint 42 during the stamping process and improving the consistency of bending forming.

[0023] like Figure 4As shown, in some other embodiments of this utility model, the bottom of the first punching rod 2 is also provided with a first rectangular pit 23, and the bottom of the second punching rod 3 is also provided with a second rectangular pit 33, and the first rectangular pit 23 and the second rectangular pit 33 can communicate with each other.

[0024] The beneficial effects of adopting the above technical solution are: the first rectangular pit 23 and the second rectangular pit 33 are respectively set at the bottom and connected to each other, which provides a structural basis for the subsequent installation of the detachable insert block and enhances the functional expandability of the mechanism.

[0025] like Figure 5 As shown, in some other embodiments of this utility model, a first inlay block 7 and a second inlay block 8 are also included. The first inlay block 7 is detachably connected to the first rectangular pit 23, and the second inlay block 8 is detachably connected to the second rectangular pit 33.

[0026] The advantages of adopting the above technical solution are: it facilitates quick replacement after wear, reduces maintenance costs, and allows for the replacement of inserts of different shapes according to different forming requirements, thereby improving the applicability of the mechanism.

[0027] In some other embodiments of this utility model, the first insert 7 and the second insert 8 are made of hard alloy.

[0028] The beneficial effects of adopting the above technical solution are: the cemented carbide material significantly improves the wear resistance and impact resistance of the stamping contact surface, and is particularly suitable for high-intensity and high-frequency stamping operations, ensuring the durability of the dovetail tenon 44 and dovetail groove 43 during the forming process.

[0029] In some other embodiments of this utility model, the radius of the arc-shaped notch 11 is adapted to the radius of the outer wall of the round tube product 4.

[0030] The beneficial effects of adopting the above technical solution are: it enables the round tube to obtain uniform coverage and support during the bending process, prevents local stress concentration from causing deformation or surface damage, and further ensures the integrity of the round tube's shape and dimensional accuracy.

[0031] In some other embodiments of this utility model, the first slope 21, the second slope 31 and their respective corresponding inclined surfaces 12 have the same inclination angle.

[0032] The beneficial effects of adopting the above technical solution are: consistent tilt angles ensure smooth sliding cooperation between the punch rod and the lower die 1 during the pressing process, reducing friction and jamming, and making the punching force transmission smoother.

[0033] In some other embodiments of this utility model, the central angle corresponding to the arc-shaped notch 11 is 180°, and the central angles corresponding to the first concave surface 22 and the second concave surface 32 are both 90°.

[0034] The beneficial effects of adopting the above technical solution are: the three parts together form a complete circular covering surface, and with the forming positions of the dovetail tenon 44 and the dovetail groove 43, the uniform force and precise forming of the round tube during bending and joining are achieved.

[0035] like Figure 2 As shown, in some other embodiments of this utility model, the lower mold 1 has a horizontally oriented hollow hole 13 inside, and the hollow hole 13 is located directly below the arc-shaped notch 11.

[0036] like Figure 1 As shown, in some other embodiments of this utility model, it also includes a push rod 5 and a spring 6. The lower die 1, the first punch rod 2, and the second punch rod 3 are each provided with a push rod 5, and one end of the push rod 5 is assembled with the spring 6.

[0037] The beneficial effects of adopting the above technical solution are: it can provide elastic restoring force after stamping, assist in demolding and buffer impact, protect the mechanism and the product, and improve the continuity of operation.

[0038] During operation, the first punch rod 2 and the second punch rod 3 first bend the C-shaped section 41 of the round tube product 4 to a near-circular shape. Then, the second punch rod 3 is lifted, while the first punch rod 2 continues to press down, bringing the dovetail tenon 44 to the same radial position as the dovetail groove 43, i.e., the dovetail tenon 44 to a radially outward position within the dovetail groove 43. Afterward, the second punch rod 3 continues to press down, formally pressing the outwardly warped dovetail tenon 44 into the dovetail groove 43.

[0039] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it. They should not be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the protection scope of this utility model.

Claims

1. A stamping and bending mechanism for round tubes based on dovetail joints, characterized in that, include: The lower mold has an arc-shaped notch at its top for supporting the round tube product, and the two sides of the arc-shaped notch have gradually decreasing slopes. The first punching rod is located above the lower die, and its bottom is provided with a first slope and a first concave curved surface. The first slope is provided in correspondence with the inclined surface on one side of the lower die. The second punching bar is arranged in parallel with the first punching bar above the lower die. Its bottom is provided with a second slope and a second concave curved surface. The second slope is arranged in correspondence with the inclined surface on the other side of the lower die. The arc-shaped notch, the first concave surface, and the second concave surface can form a circular opening for clamping the round tube product. The butt joints of the round tubular products are assembled with dovetail tenons and dovetail grooves. The first punch rod and the second punch rod each have independent lifting freedom, and the shapes of the first concave curved surface and the second concave curved surface are respectively matched with the dovetail tenon and dovetail groove to be formed.

2. The dovetail joint-based round tube stamping and bending mechanism according to claim 1, characterized in that: The bottom of the first punching rod is provided with a first rectangular pit, and the bottom of the second punching rod is provided with a second rectangular pit. The first rectangular pit and the second rectangular pit can communicate with each other.

3. The dovetail joint-based round tube stamping and bending mechanism according to claim 2, characterized in that: It also includes a first inlay block and a second inlay block, the first inlay block being detachably connected to the first rectangular pit and the second inlay block being detachably connected to the second rectangular pit.

4. The dovetail joint-based circular tube stamping and bending mechanism according to claim 3, characterized in that: The first and second inserts are made of cemented carbide.

5. The dovetail joint-based round tube stamping and bending mechanism according to claim 1, characterized in that: The radius of the arc-shaped notch is adapted to the radius of the outer wall of the circular tube product.

6. The dovetail joint-based round tube stamping and bending mechanism according to claim 1, characterized in that: The first slope and the second slope have the same inclination angle as their respective corresponding inclined planes.

7. The dovetail joint-based round tube stamping and bending mechanism according to claim 1, characterized in that: The central angle corresponding to the arc-shaped notch is 180°, and the central angles corresponding to the first concave surface and the second concave surface are both 90°.

8. The dovetail joint-based round tube stamping and bending mechanism according to claim 1, characterized in that: The lower mold has a horizontally oriented hollow hole inside, which is located directly below the arc-shaped notch.

9. The dovetail joint-based round tube stamping and bending mechanism according to claim 1, characterized in that: It also includes ejector pins and springs. The lower die, the first punching rod, and the second punching rod are each provided with ejector pins, and one end of the ejector pin is assembled with a spring.

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