A device and method for forming an oblique flange pipe fitting

Abstract

The present invention discloses a device and method for forming a bevel flange pipe fitting, belonging to the technical field of pipe fitting processing molds. The device includes a press-forming module with adjustable spacing, a press-forming inclined surface provided on the press-forming module, corresponding to a limiting hole with a self-contained pipe port plug, one of the pipe port plugs provided with a high-pressure liquid injection port, and a forming stopper provided on one of the press-forming inclined surfaces. The forming stopper includes a forming block with adjustable spacing. The method includes: S1, installing a pipe blank; S2, adjusting the spacing of the forming blocks, introducing pressurized liquid, reducing the spacing of the press-forming modules, and causing the pipe blank to initially expand; S3, increasing the spacing of the forming blocks, reducing the spacing of the press-forming modules, and causing the pipe blank to expand again; S4, increasing the spacing of the forming blocks, reducing the spacing of the press-forming modules, and causing the pipe blank to expand to a preset flange length; S5, releasing pressure, removing the pipe blank, cutting, and obtaining a bevel flange pipe fitting. The bevel flange is gradually formed under the cooperation of the mold cavity and internal pressure. The flange surface will not crack during the forming process, eliminating the need for patch welding.

Description

Technical Field

[0001] The invention relates to the technical field of pipe fitting processing dies, in particular to a bevel flange pipe fitting forming device and a forming method thereof. Background Art

[0002] Pipe fittings are often connected to other parts through flanges, and flanges are generally obtained by flanging the pipe mouth with a punch and a die. For example, the patent number is "201610525200.8", and the patent name is "A double-flanged flange processing device". It includes a die body for positioning and supporting the pipe fitting. Two punches that can move along the axis of the pipe fitting are provided at both ends of the pipe fitting. The pipe mouth can be flanging to obtain a flange through the extrusion of the two punches.

[0003] The above-mentioned punch and die matching method is applicable to the flanging of traditional flange pipe fittings with flanges perpendicular to the pipe axis, but the flange area of ​​the oblique flange pipe fittings is not perpendicular to the pipe axis, such as Figure 7 and Figure 8 The illustrated oblique flange pipe fittings inevitably experience significant wall thinning in the negative angle region during flanging deformation, which can only be addressed by welding a patch to the flange arc edge region 19, resulting in poor flange reliability and low production efficiency.

[0004] like Figure 10 The figure shows the simulated wall thickness distribution cloud map of a 5083 oblique flange pipe fitting during stamping and flanging. The original wall thickness of the pipe is 2.5 mm, and the wall thickness in the negative angle area on the upper left is already less than 1.8 mm, indicating that rupture has already occurred during the actual forming process.

[0005] Therefore, the yield rate of the bevel flange shaped pipe fittings is lower, and there is an urgent need for a device specifically for forming bevel flange pipe fittings. Summary of the Invention

[0006] The purpose of the present invention is to provide a bevel flange pipe forming device and a forming method thereof, which can change the shape of the expansion cavity multiple times by adjusting the spacing of the pressure forming modules and the spacing of the forming blocks. Under the mutual cooperation of the pressure forming of the expansion cavity and the internal pressure of the pressurized liquid medium, a bevel flange is gradually formed on the tube blank. Through the stable control of the forming process, the problem of excessive deformation and rupture caused by the traditional punch flanging is avoided, and the welding patch is eliminated, thereby significantly improving the reliability of the bevel flange pipe fitting.

[0007] To achieve the above-mentioned purpose, the present invention provides the following scheme: The present invention provides a device for forming a bevel flange pipe fitting, comprising a press forming module with adjustable spacing, wherein adjacent press forming modules are provided with mutually matching press forming inclined surfaces at one end close to each other, and correspondingly, the mutually matching press forming inclined surfaces are provided with a limiting hole for clamping the pipe end of the pipe blank, and a pipe end plug for sealing the pipe end is provided in the limiting hole, and the pipe end plug inside any one of the corresponding limiting holes is provided with a high-pressure liquid injection port connected to the pipe end, and mutually Any one of the matching forming slopes is provided with a forming stopper, which includes a forming stopper capable of adjusting the spacing along the length direction of the forming slope, and an expansion cavity is provided between the forming stopper and the forming slope for radial expansion of the tube blank therein, and the forming stopper includes an oblique stopper segment and a straight stopper segment arranged in sequence along the axial direction of the limiting hole, the straight stopper segment is fitted into the forming slope where it is located, and the spacing of the straight stopper segments can be greater than the length of the forming slope close to the oblique stopper segment.

[0008] Preferably, the pipe orifice plug includes a plug section plugged into the pipe orifice end and a limiting section for resisting the pipe orifice end, and the limiting section is fixed in the limiting hole.

[0009] Preferably, an annular sealing groove for installing an annular sealing ring is provided on the plug-in section.

[0010] Preferably, the high-pressure liquid injection port is coaxially arranged with the tube blank.

[0011] Preferably, both ends of the pressing slope with the forming block are provided with mounting baffles, and the mounting baffles are provided with a driving mechanism, and the driving mechanism includes a moving part for driving the forming block, and the moving direction of the moving part is parallel to the length direction of the pressing slope.

[0012] Preferably, the driving mechanism comprises an adjusting screw, the axis of which is parallel to the length direction of the pressing slope, and one end of the adjusting screw away from the mounting baffle is rotatably connected to the straight block segment.

[0013] Preferably, the length of the pressing slope close to the oblique stopper segment is the same as the length of the preformed flange of the tube blank.

[0014] Also disclosed is a method for forming an oblique flange pipe fitting, which uses the above-mentioned oblique flange pipe fitting forming device and includes the following steps:

[0015] S1. Inserting the two tube ends of the tube blank into the limiting holes of two adjacent forming modules respectively, adjusting the distance between the two forming modules so that the tube end plugs seal the tube ends of the tube blank;

[0016] S2. Adjusting the spacing of the forming blocks so that the straight block segments clamp the outer wall of the tube blank, and the oblique block segments and the pressing inclined surfaces adjacent to the oblique block segments form an expansion cavity. Then, pressurized liquid medium is introduced into the interior of the tube blank through the high-pressure liquid injection port, causing the tube segment of the tube blank located in the expansion cavity to expand. Simultaneously, the spacing between the two pressing modules is reduced until the expanded tube segment of the tube blank fills the expansion cavity.

[0017] S3, increasing the spacing between the forming blocks, thereby increasing the spacing between the straight block segments. A new expansion cavity is formed between the straight block segment, the oblique block segment, and the two matching forming inclined surfaces. Pressurized liquid medium is continuously introduced, and the tube segment of the tube blank located in the new expansion cavity expands. Simultaneously, the spacing between the two forming modules is reduced until the expanded tube segment of the tube blank fills the new expansion cavity.

[0018] S4. Increasing the spacing between the forming blocks so that the spacing between the straight block segments is expanded to accommodate the forming slopes near the oblique block segments, continuing to introduce pressurized liquid medium, and simultaneously reducing the spacing between the two forming modules until the expanded tube segment length of the tube blank reaches a preset flange length;

[0019] S5, stop injecting the pressurized liquid medium and release the pressure to discharge the liquid, increase the spacing between the forming modules, take out the tube blank, and cut the expanded tube section of the tube blank according to the preset flange surface to obtain the oblique flange pipe fitting.

[0020] Preferably, the spacing between the shaped blocks can be adjusted by rotating the adjusting screw.

[0021] Preferably, in step S5, after cutting is completed, the flange surface is polished and shaped.

[0022] Compared with the prior art, the present invention has achieved the following technical effects:

[0023] 1. The present invention provides a bevel flange pipe fitting forming device, which is specially used for forming bevel flanges on pipe fittings, including press-forming modules with adjustable spacing, and one of the press-forming modules is provided with forming blocks with adjustable spacing. By adjusting the spacing of the press-forming modules and the spacing of the forming blocks, expansion cavities with different shapes and spaces can be formed. Under the internal pressure of the pressurized liquid medium injected into the tube blank, the tube blank can be gradually pressed to finally form a bevel flange on the tube blank to obtain a bevel flange pipe fitting. Since the forming process is supported by the internal pressure, the supplementary material is fed axially from the tube end and the cavity is changed to gradually form the bevel flange, and the problem of excessive local deformation leading to cracking of the bevel flange will not occur like the traditional punch flanging method.

[0024] 2. The present invention provides a method for forming a bevel flange pipe fitting. By adjusting the spacing of the forming modules and the spacing of the forming blocks, the expansion cavity is gradually changed. In conjunction with the pressurized liquid, gradual forming is performed, and an expansion section in the shape of a bevel flange can be obtained effectively and stably. Finally, after cutting along the flange surface (it can also be flanging after cutting, in which case the flanging deformation is very small), a bevel flange pipe fitting can be obtained. The bevel flange will not crack during the forming process, and there is no need for welding patches. The resulting bevel flange is more reliable, ensuring the strength of the bevel flange. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 A top view of the oblique flange pipe forming device for the initial installation of the pipe blank;

[0027] Figure 2 This is a top view of the oblique flange pipe fitting forming device during the initial expansion of the tube blank;

[0028] Figure 3 This is a top view of the oblique flange pipe fitting forming device after the tube blank is initially expanded;

[0029] Figure 4 This is a top view of the flanged tube forming device during the secondary expansion of the tube blank;

[0030] Figure 5 This is a top view of the oblique flange pipe fitting forming device after the tube blank has undergone secondary expansion;

[0031] Figure 6 This is a top view of the oblique flange pipe fitting forming device after the tube blank has been expanded three times;

[0032] Figure 7 This is the side view of the oblique flange pipe fitting;

[0033] Figure 8 This is the front view of the oblique flange pipe fitting;

[0034] Figure 9 is the loading curve of the feed punch and the stopper retreat;

[0035] Figure 10 This is a simulation diagram of the direct flanging of the flange;

[0036] Figure 11 This is a cloud diagram of the wall thickness distribution of the simulated hydroforming of pipes using an oblique flange pipe forming device.

[0037] Explanation of the accompanying symbols: 1. Constant pressure forming module; 2. Dynamic pressure forming module; 3. Tube; 4. First mounting baffle; 5. Second mounting baffle; 6. First forming block; 7. Second forming block; 8. First adjusting screw; 9. Second adjusting screw; 10. Constant pressure forming inclined surface; 11. Dynamic pressure forming inclined surface; 12. Fixed pipe port plug; 13. Dynamic pipe port plug; 14. High-pressure liquid injection port; 15. Oblique block section; 16. Straight block section; 17. Annular sealing ring; 18. Preset flange surface; 19. Flange arc edge area. DETAILED DESCRIPTION

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0039] Example 1

[0040] This embodiment provides a device for forming a bevel flange pipe fitting, such as Figures 1 to 11 As shown, it includes a forming module with adjustable spacing. The ends of the two adjacent forming modules close to each other are provided with matching forming slopes, and the matching forming slopes correspond to the limiting holes for clamping the tube end of the tube blank 3, and the axis of the limiting hole is parallel to the moving direction of the forming module. A tube end plug for sealing the tube end is provided in the limiting hole, and the tube end plug in any one of the corresponding limiting holes is provided with a high-pressure liquid injection port 14 connected to the tube end. Any one of the two matching forming slopes is provided with a forming stopper. The forming stopper includes a first forming stopper 6 and a second forming stopper 7, and the first forming stopper 6 and the second forming stopper 7 can be adjusted in spacing along the length direction of the forming slope. There is an expansion cavity between the forming stopper and the pressing inclined surface for radial expansion of the tube blank 3 located therein. The forming stopper includes an oblique stopper segment 15 and a straight stopper segment 16 arranged in sequence along the axial direction of the limiting hole. The straight stopper segment 16 is in contact with the pressing inclined surface where it is located, and the spacing between the straight stopper segments 16 can be greater than the length of the pressing inclined surface close to the oblique stopper segment.

[0041] Preferably, there are at least two forming modules, and two adjacent forming modules serve as a group of forming dies. In this way, when there are two forming modules, one tube blank 3 can be processed and formed. When there are three forming modules, two tube blanks 3 can be processed and formed at the same time. Similarly, each additional forming module can increase the number of tube blanks 3 that can be processed. When the spacing is adjusted as a group of two forming modules, both forming modules can move, or one can move as a dynamic forming module 2 and the other can remain fixed as a fixed forming module 1. Which one serves as the dynamic forming module 2 and which one serves as the fixed forming module 1 depends mainly on which forming module's limiting hole the nozzle plug with the high-pressure liquid injection port 14 is located in. The purpose of this arrangement is to maintain the stability of the tube blank 3 when the high-pressure liquid is injected. At the same time, the forming stopper can be set on the fixed forming module 1 or on the dynamic forming module 2, but is preferably set on the dynamic forming module 2 to move with the dynamic forming module 2.

[0042] Specific Figures 1 to 6 For example, the left mold is a fixed pressure forming module 1, which is provided with a fixed pipe port plug 12, and the right mold is a dynamic pressure forming module 2, which is provided with a dynamic pipe port plug 13, and the forming stopper is provided on the dynamic pressure forming module 2. Figures 1 to 6 All of them are top views, so the dynamic pressure shaping module 2 moves in the horizontal direction. The detailed description of the use process is as follows:

[0043] First, refer to Figure 1 First, insert the two ends of the tube blank 3 into the fixed limit holes of the fixed pressure forming module 1 and the dynamic limit holes of the dynamic pressure forming module 2 respectively, and move the dynamic pressure forming module 2 toward the fixed pressure forming module 1 so that the fixed pipe port plug 12 in the fixed pressure forming module 1 and the dynamic pipe port plug 13 in the dynamic pressure forming module 2 respectively block the pipe ports of the tube blank 3;

[0044] Then, refer to Figure 2 , reduce the distance between the first forming block 6 and the second forming block 7 on the dynamic pressure forming module 2, so that the straight block segment 16 of the first forming block 6 and the straight block segment 16 of the second forming block 7 clamp the tube blank 3, at this time the oblique block segment 15 of the first forming block 6 and the oblique block segment 15 of the second forming block 7 and the fixed pressure forming inclined surface 10 on the fixed pressure forming module 2 form an expansion cavity; then the pressurized liquid medium is injected into the tube blank 3 through the high-pressure liquid injection port 14, and the tube section of the tube blank 3 located in the expansion cavity begins to expand radially, and at the same time, the dynamic pressure forming module 2 is moved toward the direction of the fixed pressure forming module 1, reducing the distance between the fixed pressure forming module 1 and the dynamic pressure forming module 2, so that the oblique block segment 15 of the first forming block 6, the oblique block segment 15 of the second forming block 7 and the fixed pressure forming inclined surface 10 will squeeze the expanded tube blank 3 at the same time;

[0045] Then, refer to Figure 2 and Figure 3When the expanded area of ​​the tube blank 3 roughly fills the expansion cavity, the movement of the dynamic pressure forming module 2 is stopped, and then the first forming block 6 and the second forming block 7 are synchronously moved outward to increase the distance between the first forming block 6 and the second forming block 7. At this time, the oblique block segment 15 and the straight block segment 16 of the first forming block 6 and the oblique block segment 15 and the straight block segment 16 of the second forming block 7, as well as the constant pressure forming inclined surface 10 and the dynamic pressure forming inclined surface 11 will form a new expansion cavity;

[0046] Then, refer to Figure 3 and Figure 4 , continue to inject pressurized liquid medium into the tube blank 3 through the high-pressure liquid injection port 14, the tube section of the tube blank 3 that has already expanded continues to expand, and at the same time, the tube section of the tube blank 3 between the oblique block section 15 of the first forming block 6 and the oblique block section 15 of the second forming block 7 also begins to expand. At the same time, continue to move the dynamic pressure forming module 2 toward the fixed pressure forming module 1. Under the extrusion of the oblique block section 15, the fixed pressure forming inclined surface 10 and the dynamic pressure forming inclined surface 11, and under the internal pressure of the liquid inside the tube blank 3, the expanded tube section of the tube blank 3 gradually forms a pipe fitting that is close to the shape of the new expansion cavity and roughly fills the new expansion cavity again;

[0047] Then, refer to Figure 5 and Figure 6 , continue to move the first forming stopper 6 and the second forming stopper 7 outward, increase the distance between them, and until the distance between the first forming stopper 6 and the second forming stopper 7 is greater than the length of the fixed pressure forming inclined surface 10, the expansion cavity becomes a shape with a large diameter and a small thickness, and then continue to introduce the pressurized liquid medium. At the same time, continue to move the dynamic pressure forming module 2 toward the fixed pressure forming module 1 until the expanded part of the tube blank 3 is pressed into the shape of the required flange;

[0048] Finally, stop conveying the pressurized liquid medium, extract the medium outward to release the pressure, then move the dynamic pressure forming module 2 away from the fixed pressure forming module 1, take out the tube blank 3, and then cut off the other side of the tube blank 3 along the preset flange surface 18 to obtain the oblique flange pipe fitting.

[0049] In this embodiment, Figures 1 to 11 As shown, for this type of part forming, there is a matching relationship between the first forming block 6, the second forming block 7, the constant pressure forming module 1 and the dynamic pressure forming module 2, and the internal pressure. The matching curves of the four are shown as follows: Figure 9 As shown, the matching of the four can be achieved through servo control technology, such as servo drive elements (servo cylinders, etc.).

[0050] like Figure 9As shown in the figure, the loading curve of the internal pressure during the forming process, the feed punch and the retreat of the block, the feed punch mentioned above is the dynamic pipe end plug 13 of the dynamic pressure forming module 2, and the blocks mentioned above are the first forming block 6 and the second forming block 7. After the pipe end is sealed, the internal pressure is first increased to cause a certain amount of expansion of the pipe material, and the expansion of this area is maintained during the subsequent deformation, that is, as the punch (dynamic pipe end plug 13) is fed, the upper and lower blocks (the first forming block 6 and the second forming block 7) retreat (the retreat amount can be the same or different, Figure 9 Indicates the same amount of retreat), at this time the internal pressure can be kept constant or increased according to the condition of the pipe ( Figure 9 The process continues until the pipe expands to the desired size (at a constant internal pressure). The internal pressure can then be increased to reshape the flange area more closely to a circular shape, completing the hydroforming process. Depending on the pipe's condition, the final pressure-raising and reshaping step may not be necessary.

[0051] like Figure 11 As shown in the figure, it is a cloud diagram of the wall thickness distribution of the 5083 aluminum alloy pipe hydroforming simulation using the oblique flange pipe forming device. It can be seen that a negative angle area has been formed, and the minimum wall thickness is 2.2mm, and no rupture will occur.

[0052] In this embodiment, the pipe end plug includes an inserting section and a limiting section. The outer diameter of the inserting section matches the inner diameter of the tube blank 3 and is used to be inserted into the tube blank 3. The outer diameter of the limiting section matches the inner diameter of the limiting hole and is used to support the pipe end of the tube blank 3 and play an axial limiting role. The limiting section is fixed in the limiting hole. Figures 1 to 11 As shown, a fixed pipe port plug 12 and a movable pipe port plug 13 are respectively provided in the fixed limit hole and the movable limit hole. The fixed pipe port plug 12 and the movable pipe port plug 13 both include an inserting section and a limit section.

[0053] Furthermore, in this embodiment, an annular sealing groove is provided on the plug section, and an annular sealing ring 17 is installed in the annular sealing groove to improve the sealing performance between the pipe port plug and the pipe blank 3. Figures 1 to 11 As shown, an annular sealing groove is provided on the plug-in section of the fixed pipe port plug 12 and the movable pipe port plug 13, and an annular sealing ring 17 is installed in the annular sealing groove.

[0054] Furthermore, in this embodiment, if Figures 1 to 11 As shown, the high-pressure liquid injection port 14 is coaxially arranged with the tube blank 3 to ensure that when the pressurized liquid medium is injected into the tube blank 3, the tube blank 3 can expand uniformly in the radial direction.

[0055] In this embodiment, Figures 1 to 11As shown, mounting plates are provided at both ends of the forming slope with the forming block. The mounting plates are provided with a driving mechanism, which includes a movable portion for driving the forming block. The movable portion moves in a direction parallel to the length of the forming slope. The driving mechanism can be a screw adjustment method, a servo motor, a telescopic cylinder, a telescopic hydraulic cylinder, or a design with a mechanical structure that limits movement.

[0056] The screw adjustment method is as follows: In this embodiment, Figures 1 to 11 As shown, an adjusting screw is threadedly connected to the mounting baffle, and the axis of the adjusting screw is parallel to the length direction of the pressure-forming inclined surface. The end of the adjusting screw away from the mounting baffle is rotatably connected to the straight block segment 16. By rotating the adjusting screw, the position of the adjusting screw on the mounting baffle can be changed, thereby changing the distance between the two forming blocks. Specifically, a first mounting baffle 4 and a second mounting baffle 5 are respectively provided on both sides of the dynamic pressure-forming inclined surface 11 on the dynamic pressure-forming module 2. The first mounting baffle 4 and the second mounting baffle 5 are respectively provided with a first adjusting screw 8 and a second adjusting screw 9. The end of the first adjusting screw 8 on the first mounting baffle 4 is rotatably connected to the straight block segment 16 of the first forming block 6, and the end of the second adjusting screw 9 on the second mounting baffle 5 is rotatably connected to the straight block segment 16 of the second forming block 7. When rotating, the first adjusting screw 8 and the second adjusting screw 9 on the first mounting baffle 4 and the second mounting baffle 5 are rotated as synchronously as possible to adjust the distance between the first forming block 6 and the second forming block 7.

[0057] The specific method of the telescopic cylinder or telescopic hydraulic cylinder or electric telescopic rod is as follows: for example, a telescopic cylinder / telescopic hydraulic cylinder / electric telescopic rod is respectively provided on the first mounting baffle 4 and the second mounting baffle 5, and the telescopic shafts of the two telescopic cylinders / hydraulic cylinders / electric telescopic rods are respectively fixedly connected to the straight block segment 16 of the first forming block 6 and the straight block segment 16 of the second forming block 7. By changing the telescopic amount of the telescopic shaft, the distance between the first forming block 6 and the second forming block 7 can be changed.

[0058] Furthermore, in this embodiment, the first adjusting screw 8 and the second adjusting screw 9 are rotatably connected to the straight block segment 16 via bearings.

[0059] Furthermore, in this embodiment, the length of the pressed slope near the oblique stopper section 15 is the same as the length of the preformed flange of the tube blank 3, so as to facilitate the measurement of the diameter of the expansion section on the tube blank 3 to be expanded to reach the preset flange length. Figure 6 As shown, the length of the constant pressure-shaped inclined surface 10 is the same as the length of the final formed preset flange.

[0060] Example 2

[0061] This embodiment provides a method for forming a bevel flange pipe fitting, which uses the bevel flange pipe fitting forming device in Example 1 and includes the following steps:

[0062] S1. Insert the two tube ends of the tube blank 3 into the limiting holes of two adjacent pressing modules respectively, and adjust the distance between the two pressing modules so that the tube end plugs seal the tube ends of the tube blank 3;

[0063] S2. Adjust the spacing of the forming blocks so that the two straight block segments 16 clamp the outer wall of the tube blank 3, and the oblique block segment 15 and the pressing bevel near the oblique block segment 15 form an expansion cavity. Then, pressurized liquid medium is introduced into the interior of the tube blank 3 through the high-pressure liquid injection port 14. The tube section of the tube blank 3 located in the expansion cavity expands, and at the same time, the spacing between the two pressing modules is reduced until the expanded tube section of the tube blank 3 fills the expansion cavity.

[0064] S3. Increase the spacing between the forming blocks, so that the spacing between the straight block segments 16 increases. A new expansion cavity is formed between the straight block segments 16, the oblique block segments 15, and the two matching forming slopes. Continue to introduce pressurized liquid medium, and the tube segment of the tube blank 3 located in the new expansion cavity expands. At the same time, the spacing between the two forming modules is reduced until the expanded tube segment of the tube blank fills the new expansion cavity.

[0065] S4. Increase the spacing between the forming blocks so that the spacing between the straight block segments 16 is expanded to accommodate the forming slope near the oblique block segment 15. Continue to introduce the pressurized liquid medium while reducing the spacing between the two forming modules until the expanded tube section length of the tube blank 3 reaches the preset flange length.

[0066] S5. Stop injecting the pressurized liquid medium and pump out the pressure to release it, increase the spacing between the forming modules, take out the tube blank 3, and cut off the expanded tube section of the tube blank 3 with the preset flange surface 18 to obtain the oblique flange pipe fitting.

[0067] When adjusting the distance between the two adjacent forming modules, you can move both forming modules at the same time, or just move one of them. Figures 1 to 6 The specific process is described in detail in Example 1 and will not be elaborated here.

[0068] In this embodiment, Figures 1 to 6 As shown, the spacing between the formed stops can be adjusted by rotating the first adjusting screw 8 and the second adjusting screw 9.

[0069] In this embodiment, Figures 1 to 6 As shown, in step S5, after the cutting is completed, the flange surface is polished and shaped.

[0070] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A device for forming an oblique flange pipe fitting, characterized in that: The pipe is clamped in a manner that allows the pipe to pass through the pipe and to move it in a direction that the pipe is closed by the pressure reducing device and the pressure reducing device is closed by the pressure reducing device.

2. The device for forming an oblique flange pipe fitting according to claim 1, characterized in that: The pipe orifice plug includes a plug section plugged into the pipe orifice end and a limiting section for resisting the pipe orifice end, and the limiting section is fixed in the limiting hole.

3. The device for forming an oblique flange pipe fitting according to claim 2, characterized in that: An annular sealing groove for installing an annular sealing ring is provided on the plug-in section.

4. The device for forming an oblique flange pipe fitting according to claim 3, characterized in that: The high-pressure liquid injection port is coaxially arranged with the tube blank.

5. The device for forming an oblique flange pipe fitting according to claim 1, characterized in that: Both ends of the pressing slope with the forming block are provided with mounting baffles, and the mounting baffles are provided with a driving mechanism, which includes a moving part for driving the forming block, and the moving direction of the moving part is parallel to the length direction of the pressing slope.

6. The device for forming an oblique flange pipe fitting according to claim 5, characterized in that: The driving mechanism includes an adjusting screw, the axis of which is parallel to the length direction of the pressing slope, and one end of the adjusting screw away from the mounting baffle is rotatably connected to the straight block segment.

7. The device for forming an oblique flange pipe fitting according to claim 1, characterized in that: The length of the pressing inclined surface close to the inclined stop block segment is the same as the length of the preformed flange of the tube blank.

8. A method for forming an oblique flange pipe fitting, using the oblique flange pipe fitting forming device according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. Inserting the two tube ends of the tube blank into the limiting holes of two adjacent forming modules respectively, adjusting the distance between the two forming modules so that the tube end plugs seal the tube ends of the tube blank; S2. Adjusting the spacing of the forming blocks so that the straight block segments clamp the outer wall of the tube blank, and the oblique block segments and the pressing inclined surfaces adjacent to the oblique block segments form an expansion cavity. Then, pressurized liquid medium is introduced into the interior of the tube blank through the high-pressure liquid injection port, causing the tube segment of the tube blank located in the expansion cavity to expand. Simultaneously, the spacing between the two pressing modules is reduced until the expanded tube segment of the tube blank fills the expansion cavity. S3, increasing the spacing between the forming blocks, thereby increasing the spacing between the straight block segments. A new expansion cavity is formed between the straight block segment, the oblique block segment, and the two matching forming inclined surfaces. Pressurized liquid medium is continuously introduced, and the tube segment of the tube blank located in the new expansion cavity expands. Simultaneously, the spacing between the two forming modules is reduced until the expanded tube segment of the tube blank fills the new expansion cavity. S4. Increasing the spacing between the forming blocks so that the spacing between the straight block segments is expanded to accommodate the forming slopes near the oblique block segments, continuing to introduce pressurized liquid medium, and simultaneously reducing the spacing between the two forming modules until the expanded tube segment length of the tube blank reaches a preset flange length; S5, stopping the injection of pressurized liquid medium and extracting to release the pressure, increasing the spacing between the forming modules, taking out the tube blank, and cutting the expanded tube section of the tube blank according to the preset flange surface to obtain the oblique flange pipe fitting.

9. A method for forming an oblique flange pipe fitting according to claim 8, characterized in that: The spacing between the forming blocks can be adjusted by rotating an adjusting screw whose axis is parallel to the length direction of the pressing slope.

10. A method for forming an oblique flange pipe fitting according to claim 9, characterized in that: In step S5, after the cutting is completed, the flange surface is polished and shaped.

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