Forming die for reducing transition area of pipe fitting

Abstract

The utility model discloses a pipe fitting reducing transition area forming die, which relates to the technical field of pipe fitting reducing processing and comprises a die body, an annular die sleeve is mounted on one side of the die body, a plurality of die core single bodies reciprocating along the radial direction are arranged in the die body, and the die core single bodies are annularly distributed along the same space to form a die core assembly. A space circle in which each die core monomer is located is coaxial with a central shaft of the die sleeve; a gap between the die core assembly and the die sleeve forms a forming cavity for forming the diameter expansion straight pipe; a smooth reducing section is arranged on the circumferential surface of one end, close to the inlet end of the forming cavity, of the mold core assembly; a mold pushing shaft is arranged in the mold core assembly in a reciprocating mode in the first direction, the mold pushing shaft provides power for radial movement of the mold core single bodies, and the first direction is the same as the center axis of the mold sleeve. According to the die, a smooth transition area can be provided in the diameter changing process, so that the structural strength of a pipe fitting at the diameter changing position is enhanced, stress concentration is reduced, and the durability and safety of the pipe fitting are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to pipe fitting variable diameter processing technical field especially relates to a pipe fitting variable diameter transition area forming die. BACKGROUND

[0002] Pipe fitting variable diameter processing is an important link in pipeline connection, especially when different diameter pipelines need to be connected. The traditional pipe fitting variable diameter processing method mainly relies on direct forming technology, that is, expanding the one end of the straight pipe to the required diameter through the expanding die. This method is simple and fast, but there are some obvious defects in practical application.

[0003] The traditional expanding die does not design a transition area when changing diameter, which means that the pipe fitting directly changes from one diameter to another diameter at the variable diameter position without smooth transition. This design leads to stress concentration of the pipe fitting at the variable diameter position, thereby increasing the risk of fracture. Due to the lack of transition area, the structural strength of the pipe fitting at the variable diameter position is insufficient. When subjected to pressure or external impact, these areas are more prone to fracture, affecting the service life and safety of the pipe fitting. The fracture of the pipe fitting variable diameter position not only causes the failure of the pipeline system, but also may cause safety accidents, especially in high pressure or high temperature application environment.

[0004] Therefore, there is an urgent need for a pipe fitting variable diameter transition area forming die to solve the above problems. UTILITY MODEL CONTENT

[0005] The utility model aims at providing a pipe fitting variable diameter transition area forming die to solve the above technical problems existing in the prior art.

[0006] To achieve the above purpose, the utility model provides the following scheme: a pipe fitting variable diameter transition area forming die, comprising a die body, an annular die sleeve is installed on one side of the die body, a plurality of die core monomers reciprocating along the radial direction are arranged in the die body, the die core monomers are distributed along the same space circular ring to form a die core combination, and the space circle of each die core monomer is coaxial with the center axis of the die sleeve;The gap between the die core combination and the die sleeve forms a forming cavity for forming the expanding straight pipe;The peripheral surface of one end of the die core combination close to the inlet end of the forming cavity is provided with a smooth reducing section;The die core combination is provided with a die pushing shaft reciprocating in the first direction in the inside, the die pushing shaft provides power for the radial movement of each die core monomer, and the first direction is the same as the center axis of the die sleeve.

[0007] The structure aims to provide a pipe reducing transition area forming die, which adds a transition area in the expanding die, and solves the stress concentration problem in the reducing area by adjusting the shape of the reducing area.

[0008] Optionally, each of the mold core monomers in the mold core assembly is a circular equal-division body uniformly distributed in a ring direction.

[0009] Optionally, each of the mold core monomers has a reducing transition area at one end, and each of the reducing transition areas combines to form the smooth reducing section.

[0010] Optionally, the mold core monomers and the mold body are in sliding connection through a guide.

[0011] Optionally, the mold sleeve has a plurality of mold sleeve monomers uniformly distributed in a ring direction, each of the mold sleeve monomers is in radial sliding connection with the mold body and is scaled with the scaling of the mold core assembly.

[0012] Optionally, each of the mold sleeve monomers abuts against the outer circumferential surface of the mold core assembly.

[0013] Optionally, a reset spring for resetting the mold sleeve monomers is arranged between each of the mold sleeve monomers and the mold body.

[0014] Optionally, each of the mold sleeve monomers is magnetically connected with each of the mold core monomers.

[0015] Optionally, the mold pushing shaft is in wedge-shaped connection with each of the mold core monomers.

[0016] Further, the mold pushing shaft is a tapered shaft, and each of the mold core monomers has an inner wedge-shaped surface matched with the tapered outer circumferential surface of each of the mold pushing shafts.

[0017] The utility model discloses the following technical effects:

[0018] The utility model discloses through technical innovation, not only has improved the strength and durability of pipe fitting, also has optimized production efficiency and processing accuracy, has reduced cost and labor intensity, has strengthened sealing effect, and has extensive adaptability, has provided a kind of efficient, reliable solution for pipe fitting reducing processing field. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained based on these drawings without creative labor.

[0020] Figure 1 It is a front view of the pipe reducing transition area forming die of the embodiment of the present application.

[0021] Figure 2 It is a right view of the pipe reducing transition area forming die of the embodiment of the present application.

[0022] Figure 3 It is an axonometric view of the pipe reducing transition area forming die of the embodiment of the present application. Figure 1

[0023] Figure 4 It is an axonometric view of the pipe reducing transition area forming die of the embodiment of the present application. Figure 2

[0024] Figure 5 It is an exploded view of the pipe reducing transition area forming die of the embodiment of the present application. Figure 1

[0025] Figure 6 It is an exploded view of the pipe reducing transition area forming die of the embodiment of the present application. Figure 2

[0026] Figure 7 It is a combination schematic view of the mold core assembly in the embodiment of the present application.

[0027] Figure 8 It is a structure schematic view of the mold core in the embodiment of the present application. Figure 1

[0028] Figure 9 It is a structure schematic view of the mold core in the embodiment of the present application. Figure 2

[0029] Figure 10 It is a forming process schematic view of the mold of the embodiment of the present application.

[0030] Figure 11 It is a structure schematic view of the expanding diameter straight pipe one processed by the traditional forming die.

[0031] Figure 12 It is a structure schematic view of the expanding diameter straight pipe two processed by the mold of the embodiment of the present application.

[0032] ​​​​​​In the figure: 1, shaft seat; 2, mold pushing shaft; 3, mold body; 31, first mold body; 32, second mold body; 33, third mold body; 34, mold core expansion space; 35, mold core guide installation slot; 36, mold sleeve guide installation slot; 4, mold sleeve; 40, mold sleeve unit; 41, guide groove one; 5, mold core assembly; 50, mold core unit; 51, forming end; 52, stepped platform; 53, sliding end; 54, variable diameter transition zone; 55, guide groove two; 56, limiting groove; 6, mold seat; 100, expansion diameter straight pipe one; 200, expansion diameter straight pipe two; 201, original straight pipe non-variable diameter section; 202, variable diameter transition section; 203, variable diameter section. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0034] In the field of pipe connection, especially when connecting pipes of different diameters, pipe fitting variable diameter processing technology is particularly important. The traditional pipe fitting variable diameter processing method mainly relies on direct forming technology, that is, expanding one end of the straight pipe to the required diameter directly through an expansion die. However, this method has some obvious defects in practical application, such as stress concentration, insufficient structural strength, poor durability, etc. In order to solve these problems, the present application provides a pipe fitting variable diameter transition zone forming die, which aims to provide a smooth transition area, enhance the structural strength of the pipe fitting at the variable diameter position, reduce stress concentration, and improve the durability and safety of the pipe fitting.

[0035] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0036] Reference Figures 1 to 12As shown, the utility model embodiment provides a kind of pipe fitting reducing transition zone forming die, including mould body 3, mould body 3 is hollow cylindrical structure, the centre has cavity, inside is provided with mould core;Annular mould cover 4 is installed in one side of mould body 3, and mould cover 4 is sleeve structure, can be integrated structure also can be split design that the radial expansion and contraction movement of mould core is carried out;Mould core as the core component of this mould, its outer circumferential surface is used to expand the diameter processing of straight pipe from the inside of the straight pipe to be processed, to realize the expansion and contraction movement of mould core in radial, mould core is combination, by multiple mould core monomer 50 in radial reciprocating motion in mould body 3, these mould core monomer 50 are along the same space circular ring distribution and form the mould core combination 5, the space circle of each mould core monomer 50 is coaxial with the central axis of mould cover 4;The gap between mould core combination 5 and mould cover 4 forms the forming cavity for forming expanded diameter straight pipe;Mould core combination 5 has mould push shaft 2 reciprocating in first direction inside, and mould push shaft 2 provides power for the radial movement of each mould core monomer 50, and the first direction is same direction with the central axis of mould cover 4;Mould core combination 5 and mould push shaft 2 cooperate to be able to convert the linear motion of mould push shaft 2 into the radial expansion movement of each mould core monomer 50, to further complete the diameter expansion processing of straight pipe.In the above embodiment, mould push shaft 2 axially slides on a shaft seat 1, and the end, away from mould body 3, is connected driving mechanism, and the bottom of mould body 3 is provided with mould seat 6, for supporting mould body 3, so that mould body 3 and mould push shaft 2 always keep coaxial.

[0037] In the embodiment, to enhance the structural strength of the pipe fitting at the reducing position and reduce stress concentration, a smooth reducing section is arranged on the peripheral surface of one end of the mould core combination 5 close to the inlet end of the forming cavity, which connects the two pipe bodies with different outer diameters in transition and forms a reducing transition section 202 on the pipe body after diameter expansion.

[0038] The mould in the above embodiment effectively solves the problem of insufficient structural strength of the pipe fitting caused by traditional direct reducing forming by increasing the transition area. This design eliminates the risk of rupture caused by direct reducing, significantly improves the strength and durability of the pipe fitting at the reducing position. In addition, the mould can be equipped with an intelligent control system to realize the forming and preparation of pipe products with different deformation amounts and different wall thicknesses, greatly shortening the processing time and improving the production efficiency.

[0039] In one embodiment, the mold body 3 is composed of a first mold body 31, a second mold body 32 and a third mold body 33, wherein the first mold body 31 is a disc structure with one end slotted, the second mold body 32 is a flange disc structure, and the third mold body 33 is a disc structure with one end slotted. The three mold bodies are connected by bolts, and the mold core assembly 5 and the mold sleeve 4 are assembled inside the three mold bodies. The first mold body 31 and the second mold body 32 form a mold core expansion space 34, wherein the sliding end 53 of each mold core unit 50 is located in the mold core expansion space 34, and the sliding end 53 is in sliding connection with the first mold body 31. The mold sleeve 4 is limited in the cavity formed by the combination of the second mold body 32 and the third mold body 33. When the mold sleeve 4 is an integral structure, it can be directly fixed on the second mold body 32. When the mold sleeve 4 is a split design, it can be in sliding connection with the second mold body 32.

[0040] In one embodiment, the mold core assembly is composed of eight mold core units 50, which are circular equal parts uniformly distributed in a ring.

[0041] In one embodiment, as shown in Figure 8 and Figure 9 , the mold core unit 50 includes a forming end 51, a stepped platform 52 and a sliding end 53. The radial thickness of the forming end 51 is the smallest, the stepped platform 52 is slightly higher than the forming end 51, and the radial thickness of the sliding end 53 is the largest. The sliding end 53 has a protruding height, which can be limited in the mold core expansion space 34. At the same time, a guide groove two 55 is opened on the end face of the sliding end 53, which passes through the radial center of the space where it is located. Correspondingly, a mold core guide installation groove 35 corresponding in position to the guide groove two 55 is opened on the first mold body 31, and a guide is installed in the mold core guide installation groove 35. The guide is in sliding cooperation with the guide groove two 55, which limits the mold core unit 50 to only radial reciprocating motion, and prevents radial deviation. The stepped platform 52 is used to support the mold sleeve 4, so that the forming end 51 with a height lower than the stepped platform 52 and the mold sleeve 4 leave a forming cavity for inserting the straight pipe to be processed.

[0042] In one embodiment, the peripheral surface of the forming end 51 of the mold core unit 50 has a variable-diameter transition zone 54, and each variable-diameter transition zone 54 combines to form the smooth reduced diameter section.

[0043] In some optional embodiments, a ring-shaped limiting groove 56 is opened on the stepped platform 52 of the mold core unit 50, and a limiting block (not shown in the figure) for limiting cooperation with the mold sleeve 4 can be placed in the limiting groove 56. The limiting block can be a separate sliding block or a protrusion fixed on the inner side of the mold sleeve 4.

[0044] In some alternative embodiments, the sleeve 4 is also composed of eight sleeve units 40, which are circular equal parts uniformly distributed in a ring. In this alternative embodiment, since the sleeve 4 is a split structure, it can be scaled with the scaling of the mold core assembly 5. Each of the sleeve units 40 is in sliding connection with the mold body 3 in the radial direction, specifically, a guide groove one 41 is opened on the end face of the sleeve unit 40 in the radial direction through the center of the space circle where the sleeve unit 40 is located, and correspondingly, a sleeve guide mounting groove 36 is opened on the second mold body 32 in a position corresponding to the guide groove one 41, and a guide piece can be mounted in the sleeve guide mounting groove 36, the guide piece is in sliding fit with the guide groove one 41, and the sleeve unit 40 is limited from radial deviation.

[0045] In a specific embodiment, when the sleeve 4 is composed of eight sleeve units 40, each of the sleeve units 40 is in abutment with the outer circumferential surface of each of the mold core units 50, specifically, the stepped platform 52 of the mold core unit 50.

[0046] In a specific embodiment, a reset spring for resetting the sleeve unit 40 is arranged between each of the sleeve units 40 and the mold body 3, and optionally, one end of the reset spring is fixedly connected to the outer circumferential surface of the sleeve unit 40, and the other end is fixedly connected to the inner circumferential surface of the third mold body 33.

[0047] In a specific embodiment, each of the sleeve units 40 is magnetically connected with each of the mold core units 50, so that the two can be expanded and contracted synchronously.

[0048] In a specific embodiment, the mold pushing shaft 2 is in wedge-shaped fit with each of the mold core units 50. Specifically, the mold pushing shaft 2 is a tapered shaft, and each of the mold core units 50 has an inner side wedge-shaped surface matched with the tapered outer circumferential surface of each of the mold pushing shafts 2.

[0049] It should be understood that in actual application, the mold design in the embodiment is not only suitable for ordinary steel materials, but also can be adapted to pipe reducing processing of high-strength alloy steel, high-strength magnesium alloy, high-strength aluminum alloy and other materials; and the mold in the embodiment also considers high-pressure or high-temperature application environment, and through optimization of mold material and structure, stable performance can be ensured under these harsh conditions.

[0050] It should be understood that the driving mechanism in the embodiment can be some driving structures or mechanical devices capable of realizing linear motion function / rotary motion / telescopic motion, and exemplary can be a servo motor, a hydraulic cylinder, an electric cylinder, etc.

[0051] Working principle of the embodiment of the utility model:

[0052] As Figure 10As shown, first, the straight pipe is inserted into the intermediate position between the mold core and the mold sleeve 4, the mold core is limited to ensure that the straight pipe is inserted into the appropriate position. Then, operate the driving mechanism to push the mold push shaft 2 in the first direction F1, at this time, the eight-petal mold core and the mold sleeve 4 tightly fix the straight pipe and expand outward at the same time, so that the straight pipe is expanded radially in the direction shown by F2, and the expansion is realized by the shape of the mold core. The mold core expands outward, the pipe changes with the mold core, the expansion is realized by the contact position with the mold core, and the variable diameter transition section 202 is realized by the expansion of the mold core.

[0053] As shown in Figure 12 The expansion straight pipe two 200 processed by the pipe fitting variable diameter transition zone forming die of the utility model, including the original straight pipe non-variable diameter section 201, the variable diameter transition section 202 and the variable diameter section 203, wherein the variable diameter transition section 202 is smooth transition, which can enhance the structural strength of the pipe fitting at the variable diameter position, reduce stress concentration, improve the durability and safety of the pipe fitting. Corresponding to it, as shown in Figure 11 The expansion straight pipe one 100 of the prior art processed by the pipe fitting expansion forming die does not have a variable diameter transition section 202, and there is no transition area between the unprocessed straight pipe section and the variable diameter straight pipe section, so that the structural strength of the pipe fitting at the variable diameter position is insufficient. In the durability test, the variable diameter part of the pipe fitting without a transition area often shows poor durability, which cannot meet the requirements of long-term stable operation.

[0054] Compared with the prior art, the utility model embodiment at least discloses the following beneficial effects:

[0055] 1. Improve the strength and durability of the pipe fitting: by increasing the transition area in the expansion die, the utility model effectively solves the problem of insufficient structural strength of the pipe fitting caused by traditional direct variable diameter forming. This design eliminates the risk of fracture caused by direct variable diameter, significantly improves the strength and durability of the pipe fitting at the variable diameter position.

[0056] 2. Optimize production efficiency: the forming die of the utility model can be equipped with an intelligent control system, which can realize the forming and preparation of pipe fittings with different deformation amounts and different wall thicknesses through the intelligent control system, greatly shorten the processing time, and improve the production efficiency by more than 40%. Through the optimization of the die design, the utility model is expected to also achieve similar efficiency improvement in pipe fitting variable diameter processing.

[0057] 3. Reduce material waste: using the die of the utility model can reduce the material waste caused by fracture. By reducing the processing procedures and improving the material utilization rate, the machining demand is reduced, thereby reducing the material consumption and production cost.

[0058] 4. Improve the machining precision: by accurately controlling the shape and size of the variable diameter transition zone 54, the utility model can improve the machining precision of the variable diameter position of the pipe fitting, and ensure the performance and reliability of the pipe fitting in actual application.

[0059] 5. Reduce labor intensity: compared with the traditional multiple repeated processing, the utility model reduces the frequency of tool changing and equipment adjusting, thereby reducing the frequent action of employees and labor intensity, and improving the working environment.

[0060] 6. Strong adaptability: the mold design of the utility model is not only suitable for ordinary steel, but also can adapt to pipe reducing processing of various materials such as high-strength alloy steel, high-strength magnesium alloy and high-strength aluminum alloy, thereby expanding the application range.

[0061] The conventional technical means not described in the utility model are well known by those skilled in the art.

[0062] In the description of the utility model, it should be understood that the orientation or position relationship indicated by the terms 'longitudinal', 'transverse', 'upper', 'lower', 'front','rear', 'left', 'right','vertical', 'horizontal', 'top', 'bottom', 'inner', 'outer' and the like is the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model, and does not indicate or imply that the device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0063] The above-described embodiments are only preferred modes for describing the utility model, and do not limit the scope of the utility model, and various modifications and improvements to the technical solutions of the utility model made by those skilled in the art without departing from the design spirit of the utility model should fall within the protection scope of the utility model claim.

Claims

1. A pipe fitting diameter-changing transition zone forming die, characterized in that: The invention comprises a mold body (3), a ring-shaped mold sleeve (4) is installed on one side of the mold body (3), a plurality of mold core monomers (50) that reciprocate radially are arranged in the mold body (3), and each of the mold core monomers (50) is distributed along the same spatial circular ring to form a mold core assembly (5), and the spatial circle where each of the mold core monomers (50) is located is coaxial with the central axis of the mold sleeve (4); the gap between the mold core assembly (5) and the mold sleeve (4) forms a molding cavity for molding an expanded straight tube; a smooth diameter reduction section is provided on the peripheral surface of one end of the mold core assembly (5) close to the inlet end of the molding cavity; a mold driving shaft (2) is provided inside the mold core assembly (5) to reciprocate along a first direction, and the mold driving shaft (2) provides power for the radial movement of each of the mold core monomers (50), and the first direction is coaxial with the central axis of the mold sleeve (4).

2. The pipe fitting diameter-changing transition zone forming die according to claim 1, characterized in that: Each of the mold core monomers (50) in the mold core assembly (5) is a circular isomer that is evenly distributed in the circumferential direction.

3. The pipe diameter-changing transition zone forming die according to claim 2, characterized in that: One end of the core monomer (50) has a diameter-changing transition zone (54), and the diameter-changing transition zones (54) are combined to form the smooth diameter-reducing section.

4. The pipe fitting diameter-changing transition zone forming die according to any one of claims 1 to 3, characterized in that: The mold core unit (50) is slidably connected to the mold body (3) via a guide member.

5. The pipe diameter-changing transition zone forming die according to claim 1, characterized in that: The mold sleeve (4) has a plurality of mold sleeve monomers (40) evenly distributed in an annular shape. Each mold sleeve monomer (40) is connected to the mold body (3) in a radially sliding manner and is scaled up and down as the mold core assembly (5) is scaled up and down.

6. The pipe diameter-changing transition zone forming die according to claim 5, characterized in that: Each of the mold sleeve units (40) abuts against the outer peripheral surface of the mold core assembly (5).

7. The pipe diameter-changing transition zone forming die according to claim 6, characterized in that: A reset spring for resetting the mold sleeve unit (40) is provided between each mold sleeve unit (40) and the mold body (3).

8. The pipe diameter-changing transition zone forming die according to claim 6, characterized in that: Each mold sleeve unit (40) is magnetically connected to each mold core elastic body.

9. The pipe diameter-changing transition zone forming die according to claim 1, characterized in that: The mold driving shaft (2) is wedge-fitted with each mold core monomer (50).

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