Pipe limiting structure for pipe one-time punching die

Abstract

The utility model relates to mould technical field, concretely is a kind of pipe fitting one-off piercing die pipe fitting limiting structure, including lower die holder, upper die holder is installed in lower die holder, the core rod is installed in lower die holder top, the core rod is equipped with several punchings, upper die holder end part is installed with limiting rod, the outer wall of two limiting rods is connected with abutment plate, limiting rod end part is fixedly connected with limiting block, spring is equipped with in the outer wall of limiting rod, the utility model is set up two parallel limiting rods in upper die holder end part, slidingly connects abutment plate on limiting rod, and spring is equipped with in the outer wall of limiting rod between abutment plate and limiting block, and constructs elastic limiting mechanism. When pipe fitting is punched, upper die holder drives abutment plate to descend, and abutment plate is tightly abutted to one end of pipe fitting under the elastic force of spring, realizes the effective location of pipe fitting, and this kind of structure design can effectively limit axial migration of pipe fitting in the process of piercing, ensure the accuracy of piercing position, greatly improve the machining precision of pipe fitting.

Description

Technical Field

[0001] This utility model relates to the field of mold technology, specifically to a pipe fitting limiting structure for a one-time punching mold for pipe fittings. Background Technology

[0002] In the field of pipe fitting processing, punching is a common and crucial process, especially for pipe fittings requiring multiple through holes. One-time punching dies are widely used because they can significantly improve processing efficiency. However, existing one-time punching dies for pipe fittings generally suffer from insufficient fitting positioning accuracy in actual use. Traditional limiting methods often use simple stop blocks, which can cause axial movement of the pipe fitting on the mandrel during the punching operation. This misalignment not only leads to deviations in the punching position, affecting the assembly accuracy and performance of the pipe fitting, but can also damage the punch or render the pipe fitting unusable, increasing production costs. Therefore, a reliable one-time punching die for pipe fittings is urgently needed to solve these technical problems. Utility Model Content

[0003] The purpose of this utility model is to provide a pipe fitting limiting structure for a one-time punching die for pipe fittings, so as to solve the technical problems mentioned in the background art.

[0004] To achieve the above objectives, the technical solution provided by this utility model is as follows: A pipe fitting limiting structure for a one-time punching die includes a lower die base, an upper die base mounted on the top of the lower die base via a first elastic element, a mandrel mounted on one end of the top of the lower die base via a mounting seat, the mandrel having a plurality of punch holes extending along its length, two parallel limiting rods mounted on one end of the upper die base, an abutment plate slidably connected between the outer walls of the two limiting rods and the abutment plate being located at one end of the mandrel, a limiting block fixedly connected to the free end of the limiting rod, and a spring sleeved on the outer wall of the limiting rod, the spring being located between the abutment plate and the limiting block; When punching a pipe fitting, the upper die holder drives the abutment plate to descend, so that one side of the abutment plate abuts against one end of the pipe fitting, thereby limiting the pipe fitting.

[0005] Preferably, the bottom of the side of the abutment plate near the mandrel is chamfered.

[0006] Preferably, the top of the side of the abutment plate near the mandrel has an abutment clearance groove that cooperates with the end of the upper mold base.

[0007] Preferably, the lower die base includes a base plate, two vertical plates are installed parallel to each other on the top of the base plate, a support plate is installed on the top of the vertical plates, and the support plate has a through hole that cooperates with the punching hole.

[0008] Preferably, a top plate is installed at the bottom of the upper mold base, and a punch corresponding to a punch hole is installed at the bottom of the top plate.

[0009] Preferably, the top of the lower mold base is detachably equipped with several abutment blocks along the length of the mandrel for limiting one end of the tube to the other.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows: This invention constructs an elastic limiting mechanism by setting two parallel limiting rods at the end of the upper die base, slidingly connecting an abutment plate on the limiting rods, and sleeved on the outer wall of the limiting rods between the abutment plate and the limiting block. When the pipe is punched, the upper die base drives the abutment plate to descend. Under the elastic force of the spring, the abutment plate tightly abuts against one end of the pipe, effectively limiting the pipe. This structural design can effectively limit the axial movement of the pipe during the punching process, ensuring the accuracy of the punching position and greatly improving the processing precision of the pipe. At the same time, the elastic buffering effect of the spring can avoid rigid collision between the abutment plate and the pipe, reducing damage to the surface of the pipe, and can adapt to the limiting requirements of pipes of different lengths, improving the versatility of the mold. Attached Figure Description

[0011] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments 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.

[0012] Figure 1 This is a schematic diagram of the punching die of this utility model in the punching state; Figure 2 This is a schematic diagram of the structure of the limiting block and its connecting components in the punching die of this utility model; Figure 3 This is a schematic diagram of the structure of the lower die base in the punching die of this utility model.

[0013] The attached diagram lists the components represented by each number as follows: 1. Lower mold base; 11. Base plate; 12. Vertical plate; 13. Support plate; 14. Abutment block; 15. First fixing plate; 16. Limiting block; 17. Second fixing plate; 2. First elastic element; 3. Upper mold base; 31. Top plate; 32. Punch; 4. Mounting base; 5. Core rod; 6. Punch hole; 7. Limiting rod; 8. Abutment plate; 81. Abutment clearance groove; 9. Limiting block; 10. Spring. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0015] like Figure 1-3 As shown: Embodiment 1 of this utility model is as follows: A pipe fitting limiting structure for a one-time punching die for pipe fittings includes a lower die base 1, an upper die base 3 mounted on the top of the lower die base 1 via a first elastic element 2, a mandrel 5 mounted on one end of the top of the lower die base 1 via a mounting seat 4, a plurality of punch holes 6 extending through the mandrel 4 along its length, two parallel limiting rods 7 mounted on one end of the upper die base 3, an abutment plate 8 slidably connected between the outer walls of the two limiting rods 7, the abutment plate 8 being located at one end of the mandrel 5, a limiting block 9 fixedly connected to the free end of the limiting rods 7, and a spring 10 sleeved on the outer wall of the limiting rods 7, the spring 10 being located between the abutment plate 8 and the limiting block 9; When punching the pipe fitting, the upper die holder 3 drives the abutment plate 8 to descend, so that one side of the abutment plate 8 abuts against one end of the pipe fitting, thereby limiting the pipe fitting.

[0016] As described above, this utility model constructs an elastic limiting mechanism by setting two parallel limiting rods at the end of the upper die base, slidingly connecting an abutment plate on the limiting rods, and sleeved a spring between the abutment plate and the limiting block on the outer wall of the limiting rods. When the pipe is punched, the upper die base drives the abutment plate to descend. Under the elastic force of the spring, the abutment plate tightly abuts against one end of the pipe, effectively limiting the pipe. This structural design can effectively limit the axial movement of the pipe during the punching process, ensuring the accuracy of the punching position and greatly improving the processing precision of the pipe. At the same time, the elastic buffering effect of the spring can avoid rigid collision between the abutment plate and the pipe, reducing damage to the surface of the pipe, and can adapt to the limiting requirements of pipes of different lengths, improving the versatility of the mold.

[0017] Specifically, the bottom of the side of the abutment plate 8 near the core rod 5 is chamfered.

[0018] As described above, a chamfer is provided at the bottom of the side of the abutment plate near the mandrel. This chamfer structure acts as a guide during the descent of the abutment plate and its contact with the pipe fitting, ensuring that the abutment plate quickly and smoothly aligns with and contacts the end of the pipe fitting, thus preventing jamming or misalignment between the abutment plate and the pipe fitting. This not only improves mold closing efficiency but also further reduces wear on the end of the pipe fitting from the abutment plate, ensuring the appearance quality of the pipe fitting, and also helps to improve the stability and reliability of the limiting mechanism.

[0019] Specifically, the top of the side of the abutment plate 8 near the core rod 5 is provided with an abutment relief groove 81 that cooperates with the end of the upper mold base 3.

[0020] As described above, when the abutment plate contacts the end of the pipe fitting and is subjected to a reaction force, the abutment clearance groove allows the end of the upper mold base to fit tightly against the abutment plate. At this point, the reaction force can be directly transmitted to the upper mold base, rather than being concentrated on the limiting rod. This design fundamentally prevents the limiting rod from bending or deforming due to excessive radial or axial loads, significantly improving the structural stability and service life of the limiting rod. Simultaneously, the reasonable distribution of force ensures that the abutment plate exerts a uniform and stable abutment force on the pipe fitting, avoiding abutment offset caused by deformation of the limiting rod, further improving limiting accuracy. Furthermore, the tight fit between the upper mold base and the abutment plate eliminates potential interference between components, making the mold closing process smoother and reducing mechanical wear.

[0021] Specifically, the lower mold base 1 includes a base plate 11, two vertical plates 12 are installed parallel to each other on the top of the base plate 11, and a support plate 13 is installed on the top of the vertical plates 12. The support plate 13 has through holes that cooperate with the punching holes 6.

[0022] As can be seen from the above description, the base plate provides a stable support foundation for the entire lower die base, and the two parallel vertical plates effectively enhance the structural strength of the lower die base and improve the die's resistance to deformation during the punching process. The through holes on the support plate and the punch holes on the mandrel work together to effectively guide the waste generated during the punching process, allowing the waste to be discharged quickly and smoothly from the through holes. This prevents waste from accumulating between the mandrel and the support plate and affecting the punching operation. It also reduces the wear of the mandrel and punch caused by the waste, thus extending the service life of the mold.

[0023] Specifically, a top plate 31 is installed at the bottom of the upper mold base 3, and a punch 32 is installed at the bottom of the top plate 31 to correspond with the punch 6.

[0024] As described above, the top plate increases the stability and reliability of the punch installation, preventing the punch from shifting or shaking due to uneven force during punching. This ensures the punch accurately aligns with the holes on the mandrel, and the punch can be replaced simply by removing the top plate. The one-to-one correspondence between the punch and the holes enables a single-pass punching operation for the pipe fitting, significantly improving processing efficiency. It also ensures the dimensional consistency and positional accuracy of each hole, thus enhancing the processing quality of the pipe fitting.

[0025] Specifically, the top of the lower mold base 1 is detachably equipped with several abutment blocks 15 for limiting one end of the tube to the other end (the abutment blocks 15 are installed and removed by bolts).

[0026] As described above, the detachable installation method allows for flexible adjustment of the number and position of the abutment blocks according to the length of the pipe fitting and processing requirements, adapting to the limiting requirements of different pipe fitting specifications and improving the versatility and flexibility of the mold. The abutment blocks and abutment plates cooperate to limit the pipe fitting from both ends, further enhancing the stability of the pipe fitting during the punching process, effectively preventing axial movement and radial displacement, and ensuring punching quality.

[0027] In this embodiment, a first fixing plate 15 is installed on the top of the lower mold base 1. Several limiting blocks 16 are symmetrically installed on the top of the first fixing plate 15 on both sides, and the limiting blocks 16 on both sides are arranged along the length direction of the mandrel 5. A second fixing plate 17 is installed on the top of the limiting blocks 16. The mandrel 5 is located between the first fixing plate 15, the second fixing plate 17 and the limiting blocks 16 on both sides. The first fixing plate 15 and the second fixing plate 17 are both provided with a second through hole.

[0028] The specific usage process of the above-mentioned punching die is as follows: Before punching pipe fittings, the die is installed on the punch press by bolts.

[0029] First, based on the length of the pipe to be processed, the number and position of the abutment blocks 15 on the top of the lower mold base 1 along the length of the mandrel 5 are adjusted using the detachable installation structure, so that the abutment blocks 15 can limit one end of the pipe. Then, the pipe is fitted onto the mandrel 5, and the pipe is pushed so that one end abuts against the abutment block 15, thus initially achieving the positioning of the pipe.

[0030] Then the punch press is started. Under the action of the driving force, the upper die holder 3 moves downward against the elastic force of the first elastic element 2. The upper die holder 3 drives the limiting rod 7 and the abutment plate 8 connected to its end to descend synchronously. During the descent, the chamfer on the bottom side of the abutment plate 8 near the mandrel 5 plays a guiding role, guiding the abutment plate 8 to accurately align with the other end of the pipe. As the upper die holder 3 continues to descend, the abutment plate 8 contacts and squeezes the other end of the pipe. At this time, the spring 10 sleeved on the outer wall of the limiting rod 7 is compressed, generating an elastic reaction force, so that the abutment plate 8 is tightly abutted against the end of the pipe. The abutment relief groove 81 on the top of the abutment plate 8 is tightly fitted with the end of the upper die holder 3. The width of the relief groove 81 is greater than the arc of the chamfer. That is, during the abutment process, the relief groove 81 of the abutment plate 8 is always in contact with the end of the upper die holder 3. Together with the abutment block 15, the pipe is firmly limited from both ends, effectively preventing the pipe from axially moving during the punching process.

[0031] Simultaneously, the punch 32 installed on the bottom top plate 31 of the upper die base 3 descends with the upper die base 3. The punch 32 corresponds one-to-one with the punch hole 6 on the mandrel 5. When the punch 32 passes through the pipe and enters the punch hole 6, the one-time punching operation of the pipe is completed. The waste generated during the punching process is quickly discharged through the through hole on the support plate 13 in the lower die base 1 to avoid waste accumulation. After punching is completed, the driving force is removed, and the upper die holder 3 is reset upward under the elastic force of the first elastic element 2. The abutment plate 8 is also reset under the elastic force of the spring 10, releasing the limit on the pipe fitting. The processed pipe fitting can then be taken out, completing one punching cycle.

[0032] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that modifications may be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pipe fitting limiting structure for a one-time punching die, comprising a lower die base (1), wherein an upper die base (3) is mounted on the top of the lower die base (1) via a first elastic element (2), characterized in that: The lower mold base (1) has a core rod (5) installed at one end of the top via a mounting base (4). The core rod (5) has several punch holes (6) through it along its length. The upper mold base (3) has two parallel limiting rods (7) installed at one end. An abutment plate (8) is slidably connected between the two limiting rods (7) on their outer walls. The abutment plate (8) is located at one end of the core rod (5). A limiting block (9) is fixedly connected to the free end of the limiting rod (7). A spring (10) is sleeved on the outer wall of the limiting rod (7). The spring (10) is located between the abutment plate (8) and the limiting block (9). When the pipe fitting is punched, the upper die base (3) drives the abutment plate (8) to descend, so that one side of the abutment plate (8) abuts against one end of the pipe fitting, thereby limiting the pipe fitting.

2. The pipe fitting limiting structure for a one-time punching die for pipe fittings according to claim 1, characterized in that: The bottom of the side of the abutment plate (8) near the core rod (5) is chamfered.

3. The pipe fitting limiting structure for a one-time punching die for pipe fittings according to claim 1, characterized in that: The abutment plate (8) has an abutment relief groove (81) on the top side of the side near the core rod (5) that cooperates with the end of the upper mold base (3).

4. The pipe fitting limiting structure for a one-time punching die for pipe fittings according to claim 1, characterized in that: The lower mold base (1) includes a base plate (11), and two vertical plates (12) are installed parallel to each other on the top of the base plate (11). A support plate (13) is installed on the top of the vertical plate (12), and the support plate (13) has a through hole that cooperates with the punch (6).

5. The pipe fitting limiting structure for a one-time punching die for pipe fittings according to claim 1, characterized in that: The upper mold base (3) is equipped with a top plate (31) at the bottom, and the bottom of the top plate (31) is equipped with punches (32) that correspond one-to-one with the punches (6).

6. The pipe fitting limiting structure for a one-time punching die for pipe fittings according to claim 1, characterized in that: The lower mold base (1) has several abutment blocks (14) that are detachably installed on the top along the length of the mandrel (5) to limit one end of the pipe fitting to the other end.

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