Inclined flange pipe fitting forming device and forming method thereof

Abstract

The invention discloses an inclined flange pipe fitting forming device and a forming method thereof, and belongs to the technical field of pipe fitting machining molds, the inclined flange pipe fitting forming device comprises pressing modules with adjustable intervals, pressing slopes are arranged on the pressing modules, limiting holes with pipe orifice plugs are correspondingly formed in the pressing slopes, one of the pipe orifice plugs is provided with a high-pressure liquid injection opening, and the other of the pipe orifice plugs is provided with a high-pressure liquid injection opening. And a forming stop piece is arranged on one of the pressing inclined planes and comprises forming stop blocks with adjustable intervals. The method comprises the steps that S1, a pipe blank is installed; s2, the distance between forming check blocks is adjusted, pressurized liquid is introduced, the distance between pressing modules is reduced, and the pipe blank is preliminarily expanded; s3, increasing the space between the forming stop blocks, reducing the space between the pressing modules, and expanding the pipe blank again; s4, increasing the space between forming check blocks, reducing the space between pressing modules, and expanding the pipe blank to reach the preset flange length; and S5, pressure relief is conducted, the pipe blank is taken out and cut off, and the inclined flange pipe fitting is obtained. The inclined flange is gradually formed under the cooperation of the cavity and the internal pressure, the flange face cannot be broken in the forming process, and the patch welding process is omitted.

Description

Technical Field

[0001] The invention relates to the technical field of pipe fitting processing moulds, 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 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 oblique flange pipe shown in the figure will inevitably experience a large wall thickness reduction in the negative angle area during the flanging deformation, which can only be solved by welding a patch on the flange arc edge area 19, resulting in poor flange reliability and low production efficiency.

[0004] like Fig.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 lower than 1.8 mm, indicating that rupture has obviously occurred during the actual forming process.

[0005] Therefore, the yield rate of the oblique flange shaped pipe fittings is lower, and a device dedicated to the forming of the oblique flange pipe fittings is urgently needed. Summary of the invention

[0006] The object 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, and gradually form a bevel flange on the tube blank under the cooperation of the pressure forming of the expansion cavity and the internal pressure of the pressurized liquid medium. By stable control of the forming process, the problem of excessive deformation and rupture caused by traditional punch flanging can be avoided, and welding patches can be eliminated, thereby significantly improving the reliability of the bevel flange pipe fittings.

[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 pressure forming module with adjustable spacing, wherein the adjacent pressure forming modules are provided with mutually matching pressure forming inclined surfaces at one end close to each other, and the mutually matching pressure forming inclined surfaces are provided with corresponding limiting holes for clamping the pipe mouth end of the pipe blank, and the limiting holes are provided with pipe mouth plugs for blocking the pipe mouth end, and the pipe mouth plugs inside any one of the corresponding limiting holes are provided with a high-pressure liquid injection port connected to the pipe mouth end, and the corresponding pressure forming modules are provided with mutually matching pressure forming inclined surfaces. 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 for radial expansion of the tube blank therein is provided between the forming stopper and the forming slope, 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, and the straight stopper segment is fitted with the forming slope where it is located, and the spacing of the straight stopper segment can be greater than the length of the forming slope close to the oblique stopper segment.

[0008] Preferably, the pipe port plug comprises an inserting section inserted into the pipe port end and a limiting section for resisting the pipe port 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 stopper 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 stopper, 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 inclined stopper segment is the same as the length of the preformed flange of the tube blank.

[0014] A method for forming an oblique flange pipe fitting is also disclosed, which uses the oblique flange pipe fitting forming device described above and comprises the following steps:

[0015] S1, inserting the two tube ends of the tube blank into the limiting holes of two adjacent pressing modules respectively, adjusting the distance between the two pressing modules, so that the tube end plug seals the tube end of the tube blank;

[0016] S2, adjusting the spacing of the forming blocks so that the straight block segment clamps the outer wall of the tube blank, the oblique block segment and the pressing inclined surface close to the oblique block segment form an expansion cavity, and then introducing a pressurized liquid medium into the tube blank through the high-pressure liquid injection port, so that the tube segment of the tube blank located in the expansion cavity expands, and at the same time, 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 of the forming blocks, so that the spacing of the straight block segments increases, the straight block segments, the inclined block segments and the two mutually matching pressing inclined surfaces form a new expansion cavity, continue to introduce the pressurized liquid medium, the tube segment of the tube blank located in the new expansion cavity expands, and at the same time, the spacing of the two pressing modules is reduced until the expanded tube segment of the tube blank fills the new expansion cavity;

[0018] S4, increasing the spacing of the forming blocks, so that the spacing between the straight block segments is expanded to accommodate the forming slope close to the oblique block segment, and continuing to introduce the pressurized liquid medium, while reducing the spacing between the two forming modules until the length of the expanded tube section of the tube blank reaches the 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, cut off the expanded pipe section of the tube blank according to the preset flange surface, and obtain the oblique flange pipe fitting.

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

[0021] Preferably, in step S5, after the 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 forming device, which is specially used for forming bevel flanges on pipe fittings, including forming modules with adjustable spacing, and one of the forming modules is provided with forming blocks with adjustable spacing. By adjusting the spacing of the 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 pipe blank, the pipe blank can be gradually pressed to finally form a bevel flange on the pipe blank to obtain a bevel flange pipe fitting. Because the forming process is supported by the internal pressure, the axial feeding of supplementary materials from the pipe end and the change of the cavity gradually form the bevel flange, which will not cause the problem of cracking of the bevel flange due to excessive local deformation like the traditional punch stamping and 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, and the pressurized liquid is cooperated to perform gradual forming, so that the expansion section of the bevel flange shape can be effectively and stably obtained. Finally, after cutting along the flange surface (it can also be flanging after cutting, and the flanging deformation is very small at this time), the 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, and the strength of the bevel flange is guaranteed. 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 drawings required for use in the embodiments will be briefly introduced below. 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 creative labor.

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

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

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

[0029] Figure 4 It is a top view of the flange pipe forming device during the secondary expansion of the tube blank;

[0030] Figure 5 It is a top view of the oblique flange pipe fitting forming device after the tube blank is expanded for the second time;

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

[0032] Figure 7 It 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] Fig. 9 is the loading curve of the feed punch and the stopper retreat;

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

[0036] Fig.11 This is a cloud diagram of the wall thickness distribution of the simulated hydraulic forming of the pipe using the oblique flange pipe forming device.

[0037] Explanation of the accompanying drawings: 1. fixed pressure forming module; 2. dynamic pressure forming module; 3. tube blank; 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. fixed pressure forming inclined surface; 11. dynamic pressure forming inclined surface; 12. fixed pipe port plug; 13. dynamic pipe port plug; 14. high-pressure injection port; 15. inclined 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 be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work 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 press-forming module with adjustable spacing. The ends of two adjacent press-forming modules close to each other are provided with mutually matching press-forming slopes, and the mutually matching press-forming slopes correspond to the limiting holes for clamping the tube mouth end of the tube blank 3, and the axis of the limiting hole is parallel to the moving direction of the press-forming module. A tube mouth plug for blocking the tube mouth end is provided in the limiting hole, and the tube mouth plug in any one of the corresponding limiting holes is provided with a high-pressure injection port 14 connected to the tube mouth end. Any one of the two mutually matching press-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 press-forming slope. There is an expansion cavity between the forming block and the pressing slope for radial expansion of the tube blank 3 located therein. The forming block includes an inclined block segment 15 and a straight block segment 16 arranged in sequence along the axial direction of the limiting hole. The straight block segment 16 is in contact with the pressing slope where it is located, and the spacing between the straight block segments 16 can be greater than the length of the pressing slope close to the inclined block segment.

[0041] Preferably, there are at least two forming modules, and two adjacent forming modules serve as a group of forming dies. Thus, when there are two forming modules, one tube blank 3 can be processed for forming. When there are three forming modules, two tube blanks 3 can be processed for forming at the same time. By analogy, each additional forming module can increase the number of tube blanks 3 processed. As a group of two forming modules, when adjusting the spacing, both forming modules can be moved, or one can be moved as a dynamic forming module 2 and the other can be kept fixed as a fixed forming module 1. Which one is the dynamic forming module 2 and which one is the fixed forming module 1 depends mainly on which forming module's limiting hole the pipe mouth plug with the high-pressure liquid injection port 14 is located in. The purpose of such a setting is to keep the tube blank 3 stable 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 it 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, and a fixed pipe port plug 12 is provided in the fixed pressure forming module 1. The right mold is a dynamic pressure forming module 2, and a dynamic pipe port plug 13 is provided in the dynamic pressure forming module 2. The forming stopper is arranged 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 hole of the fixed pressure forming module 1 and the dynamic limit hole 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 port 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 inject pressurized liquid medium 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, and the distance between the fixed pressure forming module 1 and the dynamic pressure forming module 2 is reduced, 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 is roughly filled with 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 fixed 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, and at the same time, continue to move the dynamic pressure forming module 2 toward the fixed pressure forming module 1, and under the extrusion of the oblique block section 15, the fixed pressure forming slope 10 and the dynamic pressure forming slope 11, plus 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 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 to increase the distance between them, 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 slope 10, and the expansion cavity becomes a shape with a large diameter and a small thickness, and then continue to introduce the pressurized liquid medium, and 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, the dynamic pressure forming module 2, and the internal pressure. The matching curves of the four are shown in Fig. 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 Fig. 9As shown in the figure, the internal pressure during the forming process, the loading curve of the feed punch and the backstop, the feed punch mentioned above is the dynamic pipe port plug 13 of the dynamic pressure forming module 2, and the backstops mentioned above are the first forming backstop 6 and the second forming backstop 7. After the pipe end is sealed, the internal pressure is first increased to cause the pipe to expand to a certain extent, and the expansion of this area is maintained during the subsequent deformation, that is, as the punch (dynamic pipe port plug 13) is fed, the upper and lower backstops (the first forming backstop 6 and the second forming backstop 7) backstop (the backstop amount can be the same or different, Fig. 9 Indicates the same amount of retreat), at this time the internal pressure can be kept constant or increase according to the condition of the pipe ( Fig. 9 The internal pressure is kept constant until the expansion of the pipe reaches the set size. The internal pressure can be increased to make the flange area more circular, and the hydroforming loading process ends. Depending on the pipe condition, the final pressure-boosting step may not be added.

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

[0052] In this embodiment, the pipe mouth plug includes an inserting section and a limiting section. The outer diameter of the inserting section matches the inner diameter of the pipe blank 3 and is used to be inserted into the pipe blank 3. The outer diameter of the limiting section matches the inner diameter of the limiting hole and is used to support the pipe mouth end of the pipe 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, and both the fixed pipe port plug 12 and the movable pipe port plug 13 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] Further, 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, both ends of the pressing slope with the forming stopper 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 stopper, and the moving direction of the moving part is parallel to the length direction of the pressing slope. The driving mechanism can adopt a screw adjustment method, or a servo motor, a telescopic cylinder, a telescopic hydraulic cylinder, etc., or a design with a mechanical structure self-limiting can be adopted.

[0056] The screw adjustment method is as follows: In this embodiment, Figures 1 to 11 As shown, an adjusting screw is threadedly connected on the mounting baffle, the axis of the adjusting screw is parallel to the length direction of the pressure-forming inclined surface, and 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, and a first adjusting screw 8 and a second adjusting screw 9 are respectively provided on the first mounting baffle 4 and the second mounting baffle 5. 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 and electric telescopic rod is as follows: for example, a telescopic cylinder / telescopic hydraulic cylinder / electric telescopic rod is respectively arranged on the first mounting baffle 4 and the second mounting baffle 5, and the telescopic axes 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, and the distance between the first forming block 6 and the second forming block 7 can be changed by changing the telescopic amount of the telescopic axis.

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

[0059] Furthermore, in this embodiment, the length of the pressed inclined surface close to the inclined 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 Embodiment 1, and includes the following steps:

[0062] S1, inserting the two tube ends of the tube blank 3 into the limiting holes of two adjacent pressing modules respectively, adjusting the distance between the two pressing modules, so that the tube end plug blocks the tube end of the tube blank 3;

[0063] S2, adjusting the spacing of the forming blocks so that the two straight block segments 16 clamp the outer wall of the tube blank 3, the oblique block segment 15 and the pressing inclined surface close to the oblique block segment 15 form an expansion cavity, and then the pressurized liquid medium is introduced into 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, increasing the spacing of the forming blocks, so that the spacing of the straight block segment 16 is increased, and a new expansion cavity is formed between the straight block segment 16, the oblique block segment 15 and the two mutually matching pressing inclined surfaces, and the pressurized liquid medium is continuously introduced, so that the tube segment of the tube blank 3 located in the new expansion cavity expands, and at the same time, the spacing between the two pressing modules is reduced until the expanded tube segment of the tube blank fills the new expansion cavity;

[0065] S4, increasing the spacing of the forming blocks, so that the spacing between the straight block segments 16 is expanded to accommodate the forming slope close to the oblique block segment 15, and continuing to introduce the pressurized liquid medium, while reducing the spacing between the two forming modules until the length of the expanded pipe section of the tube blank 3 reaches the preset flange length;

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

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

[0068] In this embodiment, Figures 1 to 6 As shown, the spacing between the formed stoppers 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 used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A device for forming a bevel flange pipe fitting, characterized in that: The pipe fittings of the embodiment of the present invention are configured to be connected to a pipe insert having a plurality of holes, each of which is connected to a plurality of holes in the pipe insert, and the plurality of holes are connected to a plurality of holes in the pipe insert.

2. The device for forming an oblique flange pipe fitting according to claim 1, characterized in that: The pipe port plug includes an inserting section inserted into the pipe port end and a limiting section used to abut against the pipe port 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: The plug-in section is provided with an annular sealing groove for installing an annular sealing ring.

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 stopper are provided with mounting baffles, and the mounting baffles are provided with a driving mechanism, which includes a moving part for driving the forming stopper, 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 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.

7. The device for forming an oblique flange pipe fitting according to claim 1, characterized in that: The length of the pressed inclined surface close to the inclined stopper section 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 pressing modules respectively, adjusting the distance between the two pressing modules, so that the tube end plug seals the tube end of the tube blank; S2, adjusting the spacing of the forming blocks so that the straight block segment clamps the outer wall of the tube blank, the oblique block segment and the pressing inclined surface close to the oblique block segment form an expansion cavity, and then introducing a pressurized liquid medium into the tube blank through the high-pressure liquid injection port, so that the tube segment of the tube blank located in the expansion cavity expands, and at the same time, 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 of the forming blocks, so that the spacing of the straight block segments increases, the straight block segments, the inclined block segments and the two mutually matching pressing inclined surfaces form a new expansion cavity, continue to introduce the pressurized liquid medium, the tube segment of the tube blank located in the new expansion cavity expands, and at the same time, the spacing of the two pressing modules is reduced until the expanded tube segment of the tube blank fills the new expansion cavity; S4, increasing the spacing of the forming blocks, so that the spacing between the straight block segments is expanded to accommodate the forming slope close to the oblique block segment, and continuing to introduce the pressurized liquid medium, while reducing the spacing between the two forming modules until the length of the expanded tube section of the tube blank reaches the preset flange length; S5, stop injecting the pressurized liquid medium and extract to release the pressure, increase the spacing of the forming modules, take out the tube blank, and cut off the expanded pipe section of the tube blank with a preset flange surface to obtain an oblique flange pipe fitting.

9. A method for forming an oblique flange pipe fitting according to claim 8, characterized in that: The spacing of the forming stoppers can be adjusted by rotating the adjusting screw.

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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