Inner flanging forming device for two-way hole of pipe fitting and operation method of inner flanging forming device

Abstract

The invention relates to the technical field of hole flanging devices, in particular to an inner flanging forming device for a two-way hole of a pipe fitting and an operation method thereof.The inner flanging forming device for the two-way hole of the pipe fitting comprises a punch assembly, an upper die assembly, a die core assembly and a lower die assembly, and the upper die assembly, the die core assembly and the lower die assembly are sequentially arranged from top to bottom; the die core assembly comprises a floating assembly and a female die core, the lower die assembly is provided with a stand column, and the upper die assembly is used for pressing the floating assembly and the female die core downwards during inner flanging operation, so that the floating assembly and the female die core sink to the upper end face of the stand column at the same time to abut against the bottom face of the female die core. The hole flanging punch is used for penetrating out of the upper die assembly in the direction of the female die core and then entering the female die hole. According to the inner flanging forming device for the two-way hole of the pipe fitting, the female die core can be supported during inner flanging operation, suspended operation of the female die core is avoided, the supporting stability of the female die core is improved, the service life of the female die core is prolonged, and the problems that the female die core is small in thickness, low in supporting strength and prone to bending deformation to cause damage are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of flanging devices, and particularly relates to an internal flanging forming device for two-way holes of pipe fittings and an operation method thereof. Background Art

[0002] A stainless steel water separator is a common pipeline device. Multiple two-way holes with specified hole pitches are arranged on the pipe wall of the pipe fitting (referring to multiple equally spaced pre-punched holes symmetrically distributed on the opposite walls of the pipe fitting). An internal flanging forming device is used to impact and form the two-way holes of the pipe fitting, so as to form opposite internal flanged holes on the pipe fitting, which can be used for connection with a shunt pipeline.

[0003] In the sheet metal flanging process, when performing a flanging operation on the pipe wall of a pipe fitting, it is necessary to first pre-punch the pipe wall, and then the pre-punched hole on the pipe wall is impacted and formed through the cooperation of a flanging punch and a die core, that is, the internal flanging of one pre-punched hole is completed.

[0004] After the internal flanging operation on the pipe fitting, there needs to be an avoidance space for the advancement and extraction of the pipe fitting. Therefore, the thickness of the die core of the existing internal flanging device for two-way holes of pipe fittings is generally small, which is convenient for extracting the flanged pipe fitting from the die core. However, due to the small thickness of the die core, the supporting strength of the die core is low, and it is easy to bend and deform under force, resulting in damage. Summary of the Invention

[0005] An object of the present invention is to provide an internal flanging forming device for two-way holes of pipe fittings, which can support the die core during the internal flanging operation, avoid the die core from operating in suspension, improve the supporting stability of the die core, extend the service life, and solve the problems of low supporting strength and easy bending and deformation resulting in damage due to the small thickness of the die core.

[0006] Another object of the present invention is to provide an operation method for an internal flanging forming device for two-way holes of pipe fittings, which can avoid the die core from operating in suspension during the internal flanging operation, improve the supporting stability of the die core, extend the service life, and solve the problems of low supporting strength and easy bending and deformation resulting in damage due to the small thickness of the die core.

[0007] To achieve the above object, a two-way hole internal flanging forming device for pipe fittings proposed by the present invention includes: a punch assembly, an upper die assembly, a die core assembly, and a lower die assembly arranged in sequence from top to bottom; the punch assembly is connected to the upper die assembly, and the punch assembly is located above the die core assembly; the die core assembly includes a floating assembly and a female die core, the floating assembly is arranged to float up and down relative to the lower die assembly, the female die core is fixedly connected to the floating assembly, a female die hole is formed on the end face of the female die core facing the upper die assembly, and the punch assembly includes a flanging punch corresponding to the female die hole; the lower die assembly is provided with a column corresponding to the female die hole, and the upper die assembly is used to press down the floating assembly and the female die core during the internal flanging operation, so that the floating assembly and the female die core sink simultaneously until the upper end face of the column abuts against the bottom face of the female die core, so that the female die core is fixed by the upper die assembly and the column. In the state where the female die core is fixed, the flanging punch is used to pass through the upper die assembly in the direction of the female die core and then enter the female die hole.

[0008] Optionally, the lower die assembly further includes a lower template, one end of the column is fixedly connected to the lower template, and the other end of the column protrudes from the lower template in the direction of the female die core.

[0009] Optionally, the floating assembly includes a floating seat and a lower elastic member, the lower elastic member is arranged between the floating seat and the lower template, the lower end of the lower elastic member is connected to the lower template, the upper end of the lower elastic member is connected to the floating seat, and the floating seat is connected to the lower template to float up and down through the lower elastic member; one end of the female die core is fixedly connected to the floating seat, and the other end of the female die core extends along the length direction of the lower template.

[0010] Optionally, the floating seat includes a body portion and a connecting portion, the connecting portions are respectively fixedly connected to both ends of the body portion along the width direction of the lower template, and the connecting portions are located at one end of the body portion away from the lower elastic member, the female die core is fixedly connected to the body portion, and the connecting portion is provided with a through first through hole; the die core assembly further includes a pulling and pushing assembly, the pulling and pushing assembly includes a connecting rod and a limiting member, the upper end of the connecting rod is connected to the upper die assembly, the lower end of the connecting rod passes through the first through hole and is fixedly connected to the limiting member; the connecting rod is connected to the connecting portion to move up and down, so that the upper end face of the limiting member is movably abutted against the bottom end face of the connecting portion.

[0011] Optionally, the punch assembly further includes an upper fixing plate. The upper end of the hole flanging punch is fixedly connected to the upper fixing plate, and the lower end of the hole flanging punch protrudes from the upper fixing plate towards the direction of the die core; the upper die assembly includes an upper die base, a stripper plate and an upper elastic member. The upper die base, the upper fixing plate and the stripper plate are arranged in sequence from top to bottom; the upper die base is fixedly connected to the upper fixing plate; the upper end of the upper elastic member passes through the upper fixing plate and is fixedly connected to the upper die base, the lower end of the upper elastic member is fixedly connected to the stripper plate, and the upper fixing plate and the stripper plate are connected in a vertically movable manner; the total load of the upper elastic member is greater than the total load of the lower elastic member; a punch hole matching the hole flanging punch is formed through the stripper plate along the plate surface, the lower end of the hole flanging punch extends into the punch hole, and the lower end surface of the hole flanging punch is flush with the lower end surface of the stripper plate.

[0012] Optionally, the punch assembly further includes a guide post. The upper and lower end surfaces of the stripper plate are provided with a first guide hole for the guide post to pass through, and the upper end surface of the lower template is provided with a second guide hole matching the guide post; the upper end of the guide post is fixedly connected to the upper fixing plate, and the lower end of the guide post passes through the first guide hole and protrudes from the stripper plate towards the direction of the lower template.

[0013] Optionally, the lower die assembly further includes a lifting assembly. The lifting assembly is located directly below the die core; the lifting assembly includes a support block and a driving component. The lower template is provided with a second mounting hole through its plate surface, the support block is arranged in the second mounting hole, and the driving component is used to drive the support block to move up and down along the second mounting hole; when the driving component drives the support block to protrude upward through the second mounting hole, the upper end surface position of the support block is higher than the upper end surface position of the column; and the position of the support block is misaligned with the position of the die hole in the length direction of the lower template.

[0014] Optionally, the lower die assembly further includes an end positioning assembly; the end positioning assembly includes a positioning block. The positioning block is arranged on the upper end surface of the lower template, and the positioning block is located at one end of the lower template close to the floating assembly. The rear end surface of the positioning block abuts against the front end surface of the die core.

[0015] Optionally, the lower die assembly further includes at least two groups of side positioning assemblies; at least two groups of side positioning assemblies are symmetrically arranged on the front and rear sides of the die core; the side positioning assembly includes a side positioning post. The lower end of the side positioning post is fixedly connected to the lower template, the upper end of the side positioning post protrudes from the lower template towards the direction of the die core, and the horizontal plane height of the upper end surface of the side positioning post is higher than the horizontal plane height of the lower end surface of the die core.

[0016] The present invention also provides an operation method for an inwards flanging forming device of a two-way hole of a pipe fitting, including an inwards flanging operation process. An inwards flanging forming device of a two-way hole of a pipe fitting as described in any one of the above is adopted. The inwards flanging operation process includes the following steps: The upper die assembly drives the punch assembly to move downward and press the floating assembly and the die core, so that the floating assembly and the die core sink simultaneously. The column passes through the pre-punched hole at the bottom of the pipe fitting and enters the pipe fitting to abut against the bottom end face of the die core, so that the die core is fixed by the upper die assembly and the column; In the state where the die core is fixed, the flanging punch sequentially passes through the upper die assembly and the pre-punched hole at the bottom of the pipe fitting in the direction of the die core and then enters the die hole to perform the inwards flanging operation.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. By arranging the column to abut against the bottom end face of the die core during the inwards flanging operation, the present invention can support the die core, avoid the die core from being suspended when the flanging punch presses down to the die hole, that is, it can avoid the die core from operating in a suspended state, improve the support stability of the die core, extend the service life of the die core, and solve the problems of low support strength and easy bending deformation and damage due to the small thickness of the die core.

[0019] 2. By arranging the floating assembly to float up and down relative to the lower die assembly, the die core can float up and down synchronously with the floating assembly. During the inwards flanging operation, the die core can float down synchronously with the floating assembly and abut against the upper end face of the column, which can avoid the die core from operating in a suspended state; When inserting the pipe fitting, the die core is in a suspended state, making the insertion of the pipe fitting convenient and smooth.

[0020] 3. By arranging the pulling assembly, when the floating seat and the die core hover relative to the lower die assembly, the pulling assembly can provide an upward supporting force for the floating seat, which helps to improve the stability of the die core when hovering. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural diagram of an inwards flanging forming device of a two-way hole of a pipe fitting according to an embodiment of the present invention;

[0022] Figure 2 is a schematic diagram of the initial state of the upper die assembly, the die core assembly and the lower die assembly of an inwards flanging forming device of a two-way hole of a pipe fitting according to an embodiment of the present invention (at this time, the upper die assembly and the lower die assembly are in an open state, and the upper die base, the upper backing plate, the lower die base and the lower backing plate are hidden);

[0023] Figure 3Schematic diagram of the flanging operation state of the upper die assembly, die core assembly and lower die assembly of the double-sided hole flanging forming device for pipe fittings according to an embodiment of the present invention (at this time, the upper die assembly and the lower die assembly are in a closed state, and the upper die base, upper backing plate, lower die base and lower backing plate are hidden);

[0024] Figure 4 Schematic diagram of the die core assembly, flanging punch, column and lifting assembly of the double-sided hole flanging forming device for pipe fittings according to an embodiment of the present invention in the flanging operation state (at this time, the upper die assembly and the lower die assembly are in a closed state, and only one flanging punch, one column and one lifting assembly are shown);

[0025] Figure 5 Schematic diagram of the open die operation state of the upper die assembly, die core assembly and lower die assembly of the double-sided hole flanging forming device for pipe fittings according to an embodiment of the present invention (at this time, the upper die assembly and the lower die assembly are in an open state, and the upper die base, upper backing plate, lower die base and lower backing plate are hidden);

[0026] Figure 6 is Figure 5 the enlarged schematic diagram of part A in

[0027] Figure 7 Schematic diagram of the open die operation state of the upper die assembly, die core assembly and lower die assembly of the double-sided hole flanging forming device for pipe fittings according to an embodiment of the present invention (at this time, the upper die assembly and the lower die assembly are in an open state, and the lifting assembly lifts the pipe fitting, and the upper die base, upper backing plate, lower die base and lower backing plate are hidden);

[0028] Figure 8 is Figure 7 the enlarged schematic diagram of part B in

[0029] Figure 9 Explosion schematic diagram of the structure of the upper die assembly and punch assembly of the double-sided hole flanging forming device for pipe fittings according to an embodiment of the present invention;

[0030] Figure 10 Schematic diagram of the structure of the end positioning assembly and side positioning assembly of the double-sided hole flanging forming device for pipe fittings according to another embodiment of the present invention.

[0031] In the accompanying drawings: 1. Upper die assembly; 11. Upper die base; 12. Stripping plate; 121. Punch hole; 122. Avoidance space; 123. First guiding hole; 13. Upper elastic member; 14. Upper backing plate; 141. Fourth through hole; 2. Die core assembly; 20. Moving gap; 21. Floating assembly; 211. Floating seat; 2111. Body part; 2112. Connecting part; 212. Lower elastic member; 22. Concave die core; 221. Concave die hole; 222. Insertion inclined surface; 23. Pulling and drawing assembly; 231. Connecting rod; 232. Limiting member; 3. Lower die assembly; 31. Column; 32. Lower template; 321. Floating space; 322. Second guiding hole; 33. Lifting assembly; 331. Supporting block; 332. Driving component; 34. Lower die base; 35. Lower backing plate; 36. Limiting post; 37. End positioning assembly; 371. Positioning block; 372. Positioning ruler; 373. Locking member; 38. Side positioning assembly; 381. Side positioning post; 382. Side positioning ring; 4. Punch assembly; 41. Flanging punch; 42. Upper fixing plate; 421. Third through hole; 43. Equal-height sleeve; 431. Limiting portion; 432. Movable portion; 44. Guiding column; 5. Pipe fitting; 51. Inner flange. Detailed implementation manners

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0033] It should be noted that all directional indications (such as up, down, left, right, front, back,...) in the embodiments of the present invention are only used to explain the relative position relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0034] In the present invention, unless otherwise clearly defined and limited, terms such as "connection" and "fixation" shall be understood in a broad sense. For example, "fixation" may be a fixed connection, may also be a fixed connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0035] In addition, in the present invention, descriptions such as "first", "second", etc. are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and / or" appearing throughout the text is that it includes three parallel scenarios. Taking "A and / or B" as an example, it includes scenario A, or scenario B, or a scenario where both A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0036] To solve the above technical problems, please refer to Figures 1 to 4 , the present invention provides an internal flanging forming device for a two-way hole of a pipe fitting, comprising: a punch assembly 4, and an upper die assembly 1, a die core assembly 2, and a lower die assembly 3 arranged in sequence from top to bottom; the punch assembly 4 is connected to the upper die assembly 1, and the punch assembly 4 is located above the die core assembly 2;

[0037] The die core assembly 2 includes a floating assembly 21 and a female die core 22. The floating assembly 21 is arranged to float up and down relative to the lower die assembly 3. The female die core 22 is fixedly connected to the floating assembly 21. An inner die hole 221 is formed on the end face of the female die core 22 facing the upper die assembly 1. The punch assembly 4 includes a flanging punch 41 corresponding to the inner die hole 221.

[0038] The lower die assembly 3 is provided with a column 31 corresponding to the inner die hole 221. The upper die assembly 1 is used to press down the floating assembly 21 and the female die core 22 during the internal flanging operation, so that the floating assembly 21 and the female die core 22 sink simultaneously until the upper end face of the column 31 abuts against the bottom surface of the female die core 22, so that the female die core 22 is fixed by the upper die assembly 1 and the column 31. In the state where the female die core 22 is fixed, the flanging punch 41 is used to penetrate the upper die assembly 1 in the direction of the female die core 22 and then enter the inner die hole 221.

[0039] It should be noted that when the internal flanging forming device for the two-way hole of the pipe fitting of the present invention is in use, the pipe fitting 5 to be flanged needs to be sleeved on the outer peripheral side of the female die core 22 until the position of the pre-punched hole on the side wall of the pipe fitting 5 corresponds to the position of the inner die hole 221; since after the internal flanging operation on the pipe fitting 5, the opposite pre-punched holes on the pipe fitting 5 will form opposite internal flanges 51 inside the pipe fitting 5 (please refer to Figure 4As shown, pre-punched holes are symmetrically distributed on the opposite walls of the pipe fitting 5. After the pre-punched holes are flanged inwards, inward flanges 51 facing each other are formed. To prevent the pipe fitting 5 from not being able to be withdrawn after the inward flanging operation, the thickness of the female die core 22 should be less than the distance between the two opposite inward flanges 51 of the pipe fitting 5.

[0040] Please refer to Figure 3 and Figure 4 , when the inward flanging forming device of the two-way hole of the pipe fitting of the present invention performs the inward flanging operation, the upper die assembly 1 presses down the floating assembly 21 and the female die core 22, so that the floating assembly 21 and the female die core 22 can sink simultaneously as the upper die assembly 1 presses down. The upright column 31 can pass through the pre-punched hole on the bottom surface of the pipe fitting 5 and enter the interior of the pipe fitting 5, and the upper end surface of the upright column 31 can correspondingly abut against the bottom end surface of the female die core 22, so that the female die core 22 is fixed by the upper die assembly 1 and the upright column 31; in the state where the female die core 22 is fixed, the floating assembly 21 stops sinking. At this time, the flanging punch 41 passes through the upper die assembly 1 and the pre-punched hole on the upper wall surface of the pipe fitting 5 in sequence and enters the female die hole 221 to perform the inward flanging operation on the pre-punched hole on the upper wall surface of the pipe fitting 5, so that the pre-punched hole is formed into an inward flanged hole under the impact of the flanging punch 41;

[0041] Please refer to Figure 5 and Figure 6 , during the mold opening operation, the upper die assembly 1 moves upward and drives the punch assembly 4 to move upward. The flanging punch 41 moves upward away from the female die hole 221 and returns to the initial position (the initial position can be referred to Figure 5 shown, which means that the end of the flanging punch 41 facing the female die core 22 is located inside the upper die assembly 1). The floating assembly 21 drives the female die core 22 to float synchronously. There is a moving gap 20 between the female die core 22 and the upright column 31 for the up and down movement of the female die core 22 and the pipe fitting 5, so that the bottom end surface of the female die core 22 gradually moves upward away from the upper end surface of the upright column 31 until the upright column 31 disengages from the pre-punched hole on the bottom surface of the pipe fitting 5;

[0042] Please refer to Figure 7 and Figure 8 , when it is necessary to withdraw the pipe fitting 5 after the inward flanging operation is completed, lift the pipe fitting 5 upward so that the inward flange 51 after the pre-punched hole on the upper wall surface of the pipe fitting 5 is flanged is completely separated from the female die hole 221, and the pipe fitting 5 can be withdrawn from the female die core 22; specifically, optionally, the pipe fitting 5 can be lifted manually, or a mechanical lifting structure can be used to lift the pipe fitting 5.

[0043] By setting the column 31 to abut against the female die core 22 during the inner flanging operation, the female die core 22 can be supported, preventing the female die core 22 from being suspended when the hole punching punch 41 presses down to the female die hole 221. That is to say, the female die core 22 can be prevented from operating in a suspended state, improving the support stability of the female die core 22 and extending the service life of the female die core 22, and solving the problem of low support strength and easy bending and deformation leading to damage due to the small thickness of the female die core 22.

[0044] Please refer to Figure 5 and Figure 6 In the initial state or the mold opening state of the inner flanging forming device for the two-way hole of the pipe fitting of the present invention (i.e., the upper mold assembly 1 and the lower mold assembly 3 are in the open state), the floating assembly 21 is in a static state. By setting the floating assembly 21 to float up and down relative to the lower mold assembly 3, there is a moving gap 20 between the female die core 22 and the column 31 for the female die core 22 and the pipe fitting 5 to move up and down. This allows the female die core 22 to float up and down synchronously with the floating assembly 21. During the inner flanging operation, the female die core 22 can float down synchronously with the floating assembly 21 and abut against the upper end face of the column 31, preventing the female die core 22 from operating in a suspended state. When inserting the pipe fitting 5, the female die core 22 is in a suspended state relative to the lower mold assembly 3, making the insertion of the pipe fitting 5 convenient and smooth.

[0045] It should be noted that, please refer to Figure 6 and Figure 8 To avoid interference between the lower wall surface of the pipe fitting 5 and the upper end of the column 31 when extracting the pipe fitting 5, the height of the moving gap 20 is at least greater than the sum of the thickness of one pipe wall of the pipe fitting 5 and the height of the inner flange 51 after the inner flanging of two opposite pre-punched holes, so that the pipe fitting 5 can be smoothly inserted into or withdrawn from the female die core 22.

[0046] When it is necessary to perform an inner flanging operation on the pre-punched hole on the other end face of the pipe fitting 5, the direction of the pipe fitting 5 can be reversed up and down, and the above actions can be repeated until the inner flanging operation of the pre-punched hole on the bottom surface of the pipe fitting 5 is completed.

[0047] Please refer to Figure 3 For further illustration, the lower mold assembly 3 further includes a lower template 32. One end of the column 31 is fixedly connected to the lower template 32, and the other end of the column 31 protrudes from the lower template 32 toward the direction of the female die core 22.

[0048] By setting the direction of the column 31 facing the female die core 22 to protrude from the lower template 32, during the inner flanging operation, the female die core 22 and the floating assembly 21 can sink simultaneously under the downward pressure of the upper die assembly 1. The female die core 22 drives the pipe fitting 5 to sink, and during the sinking process, the column 31 can smoothly pass through the pre-punched hole at the bottom surface of the pipe fitting 5 and abut against the bottom end surface of the female die core 22, thereby playing a supporting role for the female die core 22, avoiding the female die core 22 from operating in suspension, improving the supporting stability of the female die core 22, extending the service life of the female die core 22, and solving the problem that the female die core 22 is easily bent and deformed due to its small thickness and low supporting strength, resulting in damage.

[0049] Specifically, the lower template 32 is provided with a first mounting hole for mounting the column 31. One end of the column 31 is fixedly connected in the first mounting hole, and the other end of the column 31 protrudes from the lower template 32 in the direction of the female die core 22.

[0050] In another embodiment of the present invention, the column 31 can also be arranged to be movably connected to the lower template 32. Specifically, the first mounting hole penetrates through the lower template 32 up and down, and the column 31 is driven to move up and down along the first mounting hole by setting a driving member (such as a cylinder). The driving member can be arranged on the lower side of the lower template 32, and the driving end of the driving member extends into the first mounting hole from bottom to top and is fixedly connected to the lower end surface of the column 31. When in use, in the initial state, the upper end surface of the column 31 is flush with the upper end surface of the lower template 32. When the female die core 22 and the floating assembly 21 sink simultaneously under the downward pressure of the upper die assembly 1, the driving member drives the column 31 to rise, so that the column 31 can pass through the pre-punched hole at the bottom surface of the pipe fitting 5 and enter the interior of the pipe fitting 5, and abut against the bottom end surface of the female die core 22.

[0051] For further illustration, please refer to Figure 4 , the column 31 is coaxially arranged with the flanging punch 41 corresponding to it in the height direction, which helps to enhance the supporting stability of the column 31 and makes the flanging punch 41 not easy to shake or shift during the inner flanging operation.

[0052] Please refer to Figures 3 to 5 , for further illustration, the floating assembly 21 includes a floating seat 211 and a lower elastic member 212. The lower elastic member 212 is arranged between the floating seat 211 and the lower template 32. The lower end of the lower elastic member 212 is connected to the lower template 32, and the upper end of the lower elastic member 212 is connected to the floating seat 211. The floating seat 211 is connected to the lower template 32 through the lower elastic member 212 and is floatingly connected up and down.

[0053] One end of the female die core 22 is fixedly connected to the floating seat 211, and the other end of the female die core 22 extends along the length direction of the lower template 32.

[0054] Beneficial effects:

[0055] By providing the floating seat 211 and the lower elastic member 212, the female die core 22 can be suspended relative to the lower template 32, facilitating the insertion of the pipe fitting 5 into the female die core 22 or the extraction of the pipe fitting 5 from the female die core 22; during the inner flanging operation, the floating seat 211 and the female die core 22 can sink simultaneously with the downward pressing of the upper die assembly 1, so that the bottom end surface of the female die core 22 can abut against the upper end surface of the column 31 to support the female die core 22 and prevent the female die core 22 from operating in a suspended state.

[0056] For further illustration, please refer to Figure 3 and Figure 5 , the lower template 32 is provided with a floating space 321 for the floating up and down of the floating seat 211, and the lower elastic member 212 is located in the floating space 321; specifically, optionally, the shape of the floating space 321 matches the shape of the floating seat 211, which can limit the floating up and down of the floating seat 211 in the floating space 321 and prevent the floating seat 211 from shifting in the horizontal direction during the floating up and down, thus affecting the inner flanging operation of the pipe fitting 5.

[0057] Specifically, optionally, the lower elastic member 212 can be a spring, an elastic rubber ball, etc.

[0058] For further illustration, please refer to Figure 4 , one end of the female die core 22 away from the floating seat 211 is provided with an insertion inclined surface 222, and the insertion inclined surface 222 is inclined downward towards the floating seat 211, which can facilitate the insertion of the pipe fitting 5 into the female die core 22.

[0059] Please refer to Figures 3 to 5 , for further illustration, the floating seat 211 includes a body portion 2111 and a connecting portion 2112. The two ends of the body portion 2111 along the width direction of the lower template 32 are respectively fixedly connected with the connecting portion 2112, and the connecting portion 2112 is located at one end of the body portion 2111 away from the lower elastic member 212. The female die core 22 is fixedly connected with the body portion 2111, and the connecting portion 2112 is provided with a through first through hole;

[0060] The core module assembly 2 further includes a pulling component 23. The pulling component 23 includes a connecting rod 231 and a limiting member 232. The upper end of the connecting rod 231 is connected to the upper die assembly 1, and the lower end of the connecting rod 231 passes through the first through hole and is fixedly connected to the limiting member 232;

[0061] The connecting rod 231 is vertically movably connected to the connecting portion 2112, so that the upper end surface of the limiting member 232 is movably abutted against the bottom end surface of the connecting portion 2112.

[0062] Specifically, when the upper die assembly 1 moves up and down, it can drive the punch assembly 4 and the pulling component 23 to move up and down simultaneously: in the initial state or the mold opening state of the inner flanging forming device for the two-way holes of the pipe fitting in the present invention, please refer to Figure 2 or Figure 5 , the upper end surface of the limiting member 232 abuts against the lower end surface of the connecting portion 2112. At this time, the floating seat 211 is stationary relative to the lower template 32. By providing the pulling component 23, an upward supporting force can be provided for the floating seat 211;

[0063] When the upper die assembly 1 moves downward, the connecting rod 231 moves downward along the first through hole as the upper die assembly 1 moves downward. Please refer to Figure 3 , at this time, since the floating seat 211 is stationary relative to the lower template 32, the upper end surface of the limiting member 232 will gradually move downward away from the lower end surface of the connecting portion 2112, so that the floating seat 211 can be floatingly arranged relative to the lower template 32 under the action of the lower elastic member 212 until the upper die assembly 1 moves downward to be in simultaneous contact with the floating seat 211 and the upper end surface of the pipe fitting 5, and then the floating seat 211 and the female die core 22 will sink as the upper die assembly 1 continues to press downward;

[0064] When the upper die assembly 1 moves upward, the connecting rod 231 moves upward along the first through hole as the upper die assembly 1 moves upward. Please refer to Figure 5 , at this time, the upper end surface of the limiting member 232 gradually approaches and abuts against the lower end surface of the connecting portion 2112 in the direction of the upper die assembly 1. When the upper die assembly 1 moves upward in place, the female die core 22 hovers relative to the lower die assembly 3. At this time, the pulling component 23 can provide an upward supporting force for the floating seat 211, which helps to improve the stability of the female die core 22 when hovering.

[0065] Specifically and optionally, the limiting member 232 may be a nut, and the limiting member 232 is fixed to the end of the connecting rod 231 away from the upper die assembly 1 by means of threaded connection; specifically and optionally, any other structure that can movably abut against the lower end surface of the connecting portion 2112 may be used as the limiting member 232. For example, the limiting member 232 may also be a plate-like structure or a block-like structure protruding in the radial direction of the connecting rod 231, and no specific limitation is made here.

[0066] Furthermore, a plurality of the die holes 221 are provided, and the plurality of die holes 221 are evenly distributed along the length direction of the die core 22; the number of the columns 31 and the number of the flanging punches 41 are equal to the number of the die holes 221, and the positions of the columns 31, the flanging punches 41 and the die holes 221 are arranged in one-to-one correspondence.

[0067] Since most of the existing inner flanging devices for pipe fittings 5 adopt a single-station operation mode, if it is necessary to perform inner flanging operations on a plurality of equally spaced pre-punched holes on the pipe fitting 5, it is necessary to manually push the pipe fitting 5 to the operation station and sequentially perform inner flanging operations on each pre-punched hole on the pipe wall. The production efficiency is low, and because the pipe fitting 5 is manually pushed, during the inner flanging operation, it is easy to cause inaccurate hole position positioning of the pre-punched holes at the front and rear positions on the pipe fitting 5, resulting in errors in the hole pitch after inner flanging, and problems such as difficult installation will occur when applying the pipe fitting 5.

[0068] By providing a plurality of the die holes 221 in the die core 22, and arranging the die holes 221, the flanging punches 41 and the columns 31 in one-to-one correspondence, the inner flanging forming device for the double-sided holes of the pipe fitting of the present invention can perform inner flanging operations on a plurality of pre-punched holes on one end face of the pipe fitting 5 simultaneously, and omits the step of manually pushing the pipe fitting 5 to perform the inner flanging operation on the next pre-punched hole after completing the inner flanging operation on one pre-punched hole, ensuring accurate hole position positioning of each pre-punched hole of the pipe fitting 5, avoiding problems such as difficult installation when applying the pipe fitting 5, and effectively improving the inner flanging operation efficiency at the same time.

[0069] Please refer to Figures 1 to 9 , furthermore, the punch assembly 4 further includes an upper fixing plate 42. The upper end of the flanging punch 41 is fixedly connected to the upper fixing plate 42, and the lower end of the flanging punch 41 protrudes from the upper fixing plate 42 in the direction towards the die core 22;

[0070] The upper die assembly 1 includes an upper die base 11, a stripper plate 12 and an upper elastic member 13. The upper die base 11, the upper fixing plate 42 and the stripper plate 12 are arranged in sequence from top to bottom; the upper die base 11 is fixedly connected to the upper fixing plate 42;

[0071] The upper end of the upper elastic member 13 penetrates through the upper fixing plate 42 and is fixedly connected to the upper die base 11. The lower end of the upper elastic member 13 is fixedly connected to the stripper plate 12. The upper fixing plate 42 and the stripper plate 12 are connected in a vertically movable manner. The total load of the upper elastic member 13 is greater than the total load of the lower elastic member 212.

[0072] The stripper plate 12 is provided with a punch hole 121 penetrating along the plate surface and matching the flanging punch 41. The lower end of the flanging punch 41 extends into the punch hole 121, and the lower end surface of the flanging punch 41 is flush with the lower end surface of the stripper plate 12.

[0073] For further illustration, as Figure 7 shown, the upper fixing plate 42 is provided with a third through hole 421 for the upper elastic member 13 to pass through. As Figure 9 shown, the upper die assembly 1 further includes an upper backing plate 14. The upper backing plate 14 is fixedly connected between the upper die base 11 and the upper fixing plate 42. The upper backing plate 14 is provided with a fourth through hole 141 for the upper elastic member 13 to pass through.

[0074] During the inner flanging operation, since the total load of the upper elastic member 13 is greater than the total load of the lower elastic member 212, when the upper die base 11 drives the punch assembly 4 (including the upper fixing plate 42 and the flanging punch 41) and the stripper plate 12 to move downward, the lower elastic member 212 can be first compressed downward. The floating seat 211 and the female die core 22 sink synchronously until the bottom end surface of the female die core 22 abuts against the upper end surface of the column 31. At this time, the female die core 22 is fixed between the column 31 and the stripper plate 12. The stripper plate 12 moves down to the position, and the floating seat 211 stops sinking. When the upper die base 11 drives the punch assembly 4 to continue moving downward, the upper elastic member 13 is compressed until the upper fixing plate 42 is in contact with the stripper plate 12. The lower end of the flanging punch 41 sequentially penetrates downward through the punch hole 121 and the pre-punched hole on the upper end surface of the pipe fitting 5 and then enters the female die hole 221 to perform the inner flanging operation on the pipe fitting 5.

[0075] During the mold opening operation, the upper die base 11 drives the punch assembly 4 to move upward. The rebound of the upper elastic member 13 forces the pipe fitting 5 to separate from the flanging punch 41. At this time, the upper fixing plate 42 and the flanging punch 41 move upward, causing the upper fixing plate 42 to separate from the stripper plate 12. The lower end of the flanging punch 41 retracts into the punch hole 121 of the stripper plate 12, and the demolding of the pipe fitting 5 is successfully completed.

[0076] Preferably, the upper elastic member 13 is a spring or other elastic rubber member. Preferably, the number of the upper elastic members 13 can be set to be multiple, and the multiple upper elastic members 13 are symmetrically arranged relative to the flanging punch 41, and the multiple upper elastic members 13 are evenly distributed along the length direction of the upper fixing plate 42, so as to improve the stability when the upper die base 11 and the upper fixing plate 42 move up and down.

[0077] For further illustration, please refer to Figure 7 and Figure 9 As shown in, the upper fixing plate 42 and the stripper plate 12 can be connected by an equal-height sleeve 43. The equal-height sleeve 43 includes a limiting portion 431 and a movable portion 432. The upper fixing plate 42 is provided with a sleeve hole for the movable portion 432 to penetrate along the plate surface. The upper end of the movable portion 432 is fixedly connected to the limiting portion 431, and the lower end of the movable portion 432 passes through the upper fixing plate 42 and is fixedly connected to the stripper plate 12. The lower end surface of the limiting portion 431 abuts against the upper end surface of the upper fixing plate 42, and the upper fixing plate 42 is movably connected to the movable portion 432 to define the opening and closing distance between the upper fixing plate 42 and the stripper plate 12.

[0078] For further illustration, please refer to Figure 7 As shown in, an avoidance space 122 for avoiding the floating seat 211 is provided on the lower end surface of the stripper plate 12. The stripper plate 12 is also provided with an avoidance hole for avoiding the connecting rod 231. The avoidance hole is communicated with the avoidance space 122. The upper end of the connecting rod 231 is fixedly connected to the upper fixing plate 42, and the lower end of the connecting rod 231 sequentially passes through the avoidance hole, the avoidance space 122 and the first through hole and is fixedly connected to the limiting member 232. Specifically, optionally, the upper end of the connecting rod 231 can also be set to be fixedly connected to the upper die base 11 or the upper backing plate 14.

[0079] Please refer to Figure 3 and Figure 5 As shown in and, for further illustration, the punch assembly 4 further includes a guide post 44. The upper and lower end surfaces of the stripper plate 12 are provided with a first guide hole 123 for the guide post 44 to pass through. The upper end surface of the lower template 32 is provided with a second guide hole 322 that cooperates with the guide post 44;

[0080] The upper end of the guide post 44 is fixedly connected to the upper fixing plate 42, and the lower end of the guide post 44 passes through the first guide hole 123 and protrudes from the stripper plate 12 in the direction of the lower template 32.

[0081] By providing the guide post 44, the first guide hole 123, and the second guide hole 322, when the upper die assembly 1 is pressed downwards, the lower end of the guide post 44 first inserts into the second guide hole 322 for positioning, and then the hole flanging punch 41 punches into the die hole 221 for internal flanging operation, which helps to improve the stability of the internal flanging operation of the pipe fitting 5.

[0082] For further illustration, a plurality of the guide posts 44 are provided, and the plurality of guide posts 44 are symmetrically arranged relative to the hole flanging punch 41; the number of the first guide holes 123 and the second guide holes 322 is equal to the number of the guide posts 44, and the guide posts 44, the first guide holes 123, and the second guide holes 322 are arranged in one-to-one correspondence, which helps to further improve the stability when the upper die assembly 1 is pressed downwards.

[0083] Please refer to Figures 5 to 8 , for further illustration, the lower die assembly 3 further includes a lifting assembly 33, and the lifting assembly 33 is located directly below the die core 22;

[0084] The lifting assembly 33 includes a support block 331 and a driving member 332. The lower template 32 is provided with a second mounting hole penetrating along its plate surface, the support block 331 is arranged in the second mounting hole, and the driving member 332 is used to drive the support block 331 to move up and down along the second mounting hole;

[0085] Please refer to Figure 8 , when the driving member 332 drives the support block 331 to project upwards out of the second mounting hole, the upper end surface position of the support block 331 is higher than the upper end surface position of the column 31; and the position of the support block 331 is arranged in a staggered manner with the position of the die hole 221 in the length direction of the lower template 32.

[0086] Specifically, the driving member 332 is arranged on the lower side of the lower template 32, and the driving end of the driving member 332 extends into the second mounting hole from bottom to top and is fixedly connected to the lower end surface of the support block 331; by arranging the position of the support block 331 in a staggered manner with the position of the die hole 221, when the support block 331 rises, it can abut against the bottom surface of the pipe fitting 5 and will not pass through the pre-punched hole in the bottom surface of the pipe fitting 5, avoiding the inability to lift the pipe fitting 5.

[0087] During the mold opening operation, the upper mold assembly 1 drives the punch assembly 4 to move upward, and the floating assembly 21 and the female die core 22 float synchronously, so that the bottom end surface of the female die core 22 moves upward away from the upper end surface of the column 31. At this time, by setting the lifting assembly 33, the driving member 332 can drive the supporting block 331 to rise and pass through the second mounting hole, so that the supporting block 331 can abut against the bottom end surface of the pipe fitting 5 and continue to rise to lift the pipe fitting 5 until the inner flange 51 after the pre-punched hole on the upper wall surface of the pipe fitting 5 is turned inward is higher than the upper end surface position of the female die hole 221, so that the pipe fitting 5 is completely separated from the female die core 22, and the pipe fitting 5 can be quickly and smoothly withdrawn.

[0088] Since the temperature of the pipe fitting 5 is relatively high after mold opening and the length of the pipe fitting 5 is generally long, it is difficult to manually lift the pipe fitting 5 and then withdraw it, and the efficiency is relatively low. By setting the lifting assembly 33 to lift the pipe fitting 5 with the supporting block 331, the withdrawal of the pipe fitting 5 is smooth, and there is no need to manually lift the pipe fitting 5, which helps to improve production efficiency.

[0089] Furthermore, the driving member 332 can be set as a cylinder.

[0090] Furthermore, the number of the lifting assemblies 33 can be set to be multiple, and the multiple lifting assemblies 33 are respectively distributed along the length direction of the lower template 32; specifically, optionally, the number of the lifting assemblies 33 is two, and the two lifting assemblies 33 are respectively arranged on both sides of the lower template 32 in the length direction, so that the force on the pipe fitting 5 during lifting is more uniform.

[0091] Furthermore, please refer to Figure 1 The lower mold assembly 3 further includes a lower mold base 34 and a lower backing plate 35. The lower mold base 34, the lower backing plate 35 and the lower template 32 are connected in sequence from bottom to top. The fixed end of the driving member 332 can be fixedly connected to the lower mold base 34. The lower backing plate 35 is provided with a through second through hole along the plate surface for the driving end of the driving member 332 to pass through the second through hole and then be connected to the lower end surface of the supporting block 331.

[0092] Furthermore, please refer to Figure 1, the lower die assembly 3 further includes a limit post 36. One end of the limit post 36 is fixedly connected to the lower template 32, and the other end of the limit post 36 protrudes from the lower template 32 toward the upper die assembly 1. When the bottom end surface of the female die core 22 abuts against the upper end surface of the column 31, the lower end surface of the upper die assembly 1 simultaneously fits against the upper end surfaces of the floating seat 211, the pipe fitting 5, and the limit post 36, which serves to limit the position where the upper die assembly 1 presses down on the floating seat 211 and the female die core 22. Since the stress of the female die core 22 will be concentrated when the upper die assembly 1 only presses tightly on the floating seat 211 and the pipe fitting 5 (i.e., presses tightly on the female die core 22), it is easy to cause the female die core 22 to bend and deform. By providing the limit post 36, it helps to disperse the stress concentration degree of the upper die assembly 1 on the female die core 22 and prevent the female die core 22 from bending and deforming. Preferably, a plurality of limit posts 36 are provided, and the plurality of limit posts 36 are symmetrically arranged relative to the female die core 22.

[0093] Please refer to Figure 1 and Figure 10 , for further illustration, the lower die assembly 3 further includes an end positioning assembly 37; the end positioning assembly 37 includes a positioning block 371. The positioning block 371 is provided on the upper end surface of the lower template 32, and the positioning block 371 is located at one end of the lower template 32 close to the floating assembly 21. The rear end surface of the positioning block 371 abuts against the front end surface of the female die core 22.

[0094] The end positioning assembly 37 is used to position the end of the inserted pipe fitting 5. When performing the inner flanging operation, the pipe fitting 5 is sleeved on the female die core 22 until the end of the pipe fitting 5 abuts against the positioning block 371, and the positioning of the end of the pipe fitting 5 is completed. Specifically, the positioning block 371 is located at one end of the lower template 32 close to the floating seat 211;

[0095] , for further illustration, the end positioning assembly 37 further includes a positioning ruler 372 and a locking member 373. The positioning ruler 372 is provided with scales; the positioning ruler 372 is fixed on the upper end surface of the lower template 32, and the positioning ruler 372 is arranged parallel to the female die core 22. The left and right side walls of the positioning block 371 are penetrated with sliding grooves, and the positioning ruler 372 passes through the sliding grooves and is connected to the positioning block 371. The positioning block 371 can slide left and right relative to the positioning ruler 372; by adjusting the position of the positioning block 371 relative to the positioning ruler 372, the position of the end of the pipe fitting 5 relative to the female die core 22 can be conveniently adjusted.

[0096] The locking member 373 is used to lock the positioning block 371 and the positioning ruler 372. After locking, it can prevent the positioning block 371 from shifting in the left - right direction, which may cause inaccurate positioning of the end of the pipe fitting 5. Specifically, the locking member 373 is a locking bolt. A locking hole for installing the locking member 373 is provided on the front end face of the positioning block 371. The locking member 373 is threadedly connected to the locking hole. The locking hole communicates with the sliding groove. The locking member 373 is inserted into the sliding groove from the locking hole and abuts against the front end face of the positioning ruler 372 to realize the locking between the positioning block 371 and the positioning ruler 372.

[0097] Please refer to Figure 10 , for further illustration, the lower die assembly 3 further includes at least two groups of side positioning assemblies 38; at least two groups of side positioning assemblies 38 are symmetrically arranged on the front and rear sides of the female die core 22;

[0098] The side positioning assembly 38 includes a side positioning post 381. The lower end of the side positioning post 381 is fixedly connected to the lower template 32. The upper end of the side positioning post 381 protrudes from the lower template 32 towards the direction of the female die core 22, and the height of the horizontal plane where the upper end face of the side positioning post 381 is located is higher than the height of the horizontal plane where the lower end face of the female die core 22 is located.

[0099] After the pipe fitting 5 is inserted into the female die core 22, the front and rear side walls of the pipe fitting 5 respectively abut against the opposite side faces of the two side positioning posts 381 of the two groups of side positioning assemblies 38, so that the pipe fitting 5 can be limited between the two symmetric side positioning posts 381, realizing the centering positioning of the pipe fitting 5 and avoiding inaccurate positioning during the inner flanging operation caused by the displacement of the pipe fitting 5 in the front - rear direction.

[0100] For further illustration, the side positioning assembly 38 further includes a side positioning ring 382. The side positioning ring 382 is sleeved on the outer peripheral side of the side positioning post 381, and the side positioning ring 382 is rotatably arranged with the side positioning post 381. The rolling axis of the side positioning ring 382 is perpendicular to the lower template 32. When the pipe fitting 5 is extracted, the two side walls of the pipe fitting 5 are respectively in rolling connection with the two side positioning rings 382, which can avoid scratching the pipe fitting 5 when the pipe fitting 5 is extracted.

[0101] The present invention also proposes an operation method for an inner flanging forming device of a pipe fitting with double - sided holes, including an inner flanging operation process. Using the inner flanging forming device of a pipe fitting with double - sided holes as described in any one of the above, the inner flanging operation process includes the following steps:

[0102] The upper die assembly 1 drives the punch assembly 4 to move downward and press the floating assembly 21 and the female die core 22, causing the floating assembly 21 and the female die core 22 to sink simultaneously. The column 31 passes through the pre-punched hole at the bottom of the pipe fitting 5 and enters the pipe fitting 5 to abut against the bottom end surface of the female die core 22, so that the female die core 22 is fixed by the upper die assembly 1 and the column 31.

[0103] In the state where the female die core 22 is fixed, the flanging punch 41 penetrates the upper die assembly 1 and the pre-punched hole at the bottom of the pipe fitting 5 in sequence towards the female die core 22 and enters the female die hole 221 to perform an internal flanging operation.

[0104] Furthermore, before the internal flanging operation process, the following steps are also included:

[0105] In the initial state, first, the pipe fitting 5 is sleeved on the female die core 22 so that the pre-punched hole on the wall surface of the pipe fitting 5 corresponds to the position of the female die hole 221 on the female die core 22.

[0106] In the operation method of the internal flanging forming device for the double-sided hole of the pipe fitting of the present invention, the female die core 22 can float up and down synchronously with the floating assembly 21; during the internal flanging operation process, the female die core 22 floats down synchronously with the floating assembly 21 and abuts against the upper end surface of the column 31, which can prevent the female die core 22 from operating in a suspended state; when the pipe fitting 5 is inserted, the female die core 22 is in a suspended state, and the insertion of the pipe fitting 5 is convenient and smooth.

[0107] Furthermore, the operation method of the internal flanging forming device for the double-sided hole of the pipe fitting also includes an open die operation process, and the open die operation process includes the following steps:

[0108] The upper die assembly 1 drives the punch assembly 4 to move upward, the flanging punch 41 disengages from the female die hole 221 and returns to the inside of the upper die assembly 1, and the floating assembly 21 and the female die core 22 float up synchronously with the upward movement of the upper die assembly 1, so that the bottom end surface of the female die core 22 gradually moves away from the upper end surface of the column 31 upward, and the pre-punched hole at the bottom surface of the pipe fitting 5 is separated from the column 31.

[0109] The pipe fitting 5 is lifted upward so that the inner flange 51 after the internal flanging of the pre-punched hole on the upper wall surface of the pipe fitting 5 is completely disengaged from the female die hole 221 to push the pipe fitting 5 out of the female die core 22.

[0110] In one embodiment, the internal flanging operation process specifically includes the following steps:

[0111] The upper die assembly 1 drives the punch assembly 4 to move downward, and at the same time drives the drawing assembly 23 to move downward (it should be noted that the drawing assembly 23 does not support the floating seat 211 when moving downward). When the lower end surface of the stripping plate 12 is simultaneously in contact with the upper end surfaces of the floating seat 211 and the pipe fitting 5, the upper die assembly 1 drives the punch assembly 4 to continue moving downward and presses the floating seat 211 and the female die core 22. The lower elastic member 212 is compressed, and the floating seat 211 and the female die core 22 sink simultaneously until the upright post 31 passes through the pre-punched hole at the bottom of the pipe fitting 5 and enters the pipe fitting 5 to abut against the bottom end surface of the female die core 22. At this time, the floating seat 211 and the female die core 22 stop sinking, and the female die core 22 is fixed between the stripping plate 12 and the upright post 31;

[0112] In the state where the female die core 22 is fixed, the upper die base 11 drives the punch assembly 4 to continue moving downward, and the upper elastic member 13 is compressed. During the process of gradual contact between the upper fixing plate 42 and the stripping plate 12, the flanging punch 41 sequentially passes through the upper die assembly 1 and the pre-punched hole at the bottom of the pipe fitting 5 in the direction of the female die core 22 and enters the female die hole 221 to perform an internal flanging operation, causing the pre-punched hole to be impacted and formed into an internal flanged hole.

[0113] The mold opening operation process specifically includes the following steps:

[0114] When the upper die assembly 1 drives the punch assembly 4 to move upward, it simultaneously drives the drawing assembly 23 to move upward (the limiting member 232 of the drawing assembly 23 will gradually approach the lower end surface of the connecting portion 2112 of the floating seat 211). The rebound of the upper elastic member 13 forces the pipe fitting 5 to separate from the flanging punch 41, causing the upper fixing plate 42 to separate from the stripping plate 12, and the lower end of the flanging punch 41 retracts into the punch hole 121 of the stripping plate 12 to complete the demolding of the pipe fitting 5;

[0115] The upper die assembly 1 drives the punch assembly 4 to continue to move upward, and the lower end surface of the stripper plate 12 gradually moves upward away from the floating seat 211 and the upper end surface of the pipe fitting 5, and the limit member 232 continues to approach and abut against the lower end surface of the connecting portion 2112. Under the action of the restoring force of the lower elastic member 212, the floating seat 211 and the die core 22 drive the pipe fitting 5 to float synchronously, so that the bottom end surface of the die core 22 gradually moves upward away from the upper end surface of the column 31, and the pipe fitting 5 The pre-punched hole on the bottom surface is separated from the column 31; when the floating seat 211 and the die core 22 are in a suspended state (when the floating seat 211 and the die core 22 are in a floating and suspended state, the pulling assembly 23 can provide an upward supporting force for the floating seat 211), the lifting assembly 33 is used to lift the pipe 5 upward until the inner flange 51 of the pre-punched hole on the upper wall of the pipe 5 is inverted and is higher than the upper end surface of the die hole 221, so that the pipe 5 is completely separated from the die core 22.

[0116] The technical principle of the present invention is described above in conjunction with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the scope of protection of the present invention in any way. Based on the explanations herein, those skilled in the art can associate other specific implementations of the present invention without paying creative labor, and these methods will fall within the scope of protection of the present invention.

Claims

1. An internal flanging forming device for a two-way hole of a pipe fitting, characterized in that, Including: A punch assembly, an upper die assembly, a die core assembly, and a lower die assembly arranged in sequence from top to bottom; the punch assembly is connected to the upper die assembly, and the punch assembly is located above the die core assembly; The die core assembly includes a floating assembly and a female die core. The floating assembly is arranged to float up and down relative to the lower die assembly. The female die core is fixedly connected to the floating assembly. A female die hole is formed in the end face of the female die core facing the upper die assembly. The punch assembly includes a flanging punch corresponding to the female die hole; The lower die assembly is provided with a column corresponding to the female die hole. The upper die assembly is used to press down the floating assembly and the female die core during the inner flanging operation, so that the floating assembly and the female die core sink simultaneously until the upper end face of the column abuts against the bottom face of the female die core, so that the female die core is fixed by the upper die assembly and the column. In the state where the female die core is fixed, the flanging punch is used to pass through the upper die assembly in the direction of the female die core and then enter the female die hole.

2. The inward flanging forming device for the two-way hole of the pipe fitting according to claim 1, wherein, The lower die assembly further includes a lower template. One end of the column is fixedly connected to the lower template, and the other end of the column protrudes from the lower template in the direction of the female die core.

3. The flanging forming device for the double-sided holes of the pipe fitting according to claim 2, characterized in that, The floating assembly includes a floating seat and a lower elastic member. The lower elastic member is arranged between the floating seat and the lower template. The lower end of the lower elastic member is connected to the lower template, and the upper end of the lower elastic member is connected to the floating seat. The floating seat is connected to the lower template to float up and down through the lower elastic member; One end of the female die core is fixedly connected to the floating seat, and the other end of the female die core extends along the length direction of the lower template.

4. The flanging forming device for the two-way hole of the pipe fitting according to claim 3, characterized in that The floating seat includes a main body portion and a connecting portion. The two ends of the main body portion along the width direction of the lower template are respectively fixedly connected with the connecting portion, and the connecting portion is located at one end of the main body portion away from the lower elastic member. The female die core is fixedly connected to the main body portion, and the connecting portion is provided with a through first through hole; The die core assembly further includes a pulling and pushing assembly. The pulling and pushing assembly includes a connecting rod and a limiting member. The upper end of the connecting rod is connected to the upper die assembly, and the lower end of the connecting rod passes through the first through hole and is fixedly connected to the limiting member; The connecting rod is connected to the connecting portion to move up and down, so that the upper end face of the limiting member is in movable abutment with the bottom end face of the connecting portion.

5. The flanging forming device for the double-sided holes of the pipe fitting according to claim 3, characterized in that, The punch assembly further includes an upper fixing plate. The upper end of the flanging punch is fixedly connected to the upper fixing plate, and the lower end of the flanging punch protrudes from the upper fixing plate in the direction of the female die core; The upper die assembly includes an upper die base, a stripping plate, and an upper elastic member. The upper die base, the upper fixing plate, and the stripping plate are arranged in sequence from top to bottom; the upper die base is fixedly connected to the upper fixing plate; The upper end of the upper elastic member passes through the upper fixing plate and is fixedly connected to the upper die base, the lower end of the upper elastic member is fixedly connected to the stripping plate, and the upper fixing plate is connected to the stripping plate to move up and down; the total load of the upper elastic member is greater than the total load of the lower elastic member; The stripper plate is provided with a punch hole penetrating through the plate surface and matching with the flanging punch. The lower end of the flanging punch extends into the punch hole, and the lower end surface of the flanging punch is flush with the lower end surface of the stripper plate.

6. The flanging forming device for the double-sided holes of the pipe fitting according to claim 5, characterized in that, The punch assembly further includes a guide post. The upper and lower end surfaces of the stripper plate are provided with a first guide hole for the guide post to pass through. The upper end surface of the lower template is provided with a second guide hole matching with the guide post. The upper end of the guide post is fixedly connected to the upper fixing plate. The lower end of the guide post passes through the first guide hole and protrudes from the stripper plate in the direction of the lower template.

7. The inside flanging forming device for the two-way hole of the pipe fitting according to claim 2, characterized in that, The lower die assembly further includes a lifting assembly. The lifting assembly is located directly below the die core. The lifting assembly includes a support block and a driving component. The lower template is provided with a second installation hole penetrating through the plate surface. The support block is arranged in the second installation hole, and the driving component is used to drive the support block to move up and down along the second installation hole. When the driving component drives the support block to protrude upward from the second installation hole, the upper end surface position of the support block is higher than the upper end surface position of the column. And the position of the support block is misaligned with the position of the die hole in the length direction of the lower template.

8. The flanging forming device for the double-sided holes of the pipe fitting according to claim 2, characterized in that, The lower die assembly further includes an end positioning component. The end positioning component includes a positioning block. The positioning block is arranged on the upper end surface of the lower template, and the positioning block is located at one end of the lower template close to the floating component. The rear end surface of the positioning block abuts against the front end surface of the die core.

9. The inside flanging forming device for the two-way hole of the pipe fitting according to claim 2, wherein, The lower die assembly further includes at least two groups of side positioning components. At least two groups of side positioning components are symmetrically arranged on the front and rear sides of the die core. The side positioning component includes a side positioning post. The lower end of the side positioning post is fixedly connected to the lower template. The upper end of the side positioning post protrudes from the lower template in the direction of the die core, and the horizontal plane height of the upper end surface of the side positioning post is higher than the horizontal plane height of the lower end surface of the die core.

10. An operating method for an inwards flanging forming device of a two-way hole of a pipe fitting, including an inwards flanging operation process, characterized in that, Adopt the inner flanging forming device for the two-way hole of the pipe fitting as described in any one of claims 1 to 9. The inner flanging operation process includes the following steps: The upper die assembly drives the punch assembly to move downward and press the floating component and the die core, so that the floating component and the die core sink simultaneously. The column passes through the pre-punched hole at the bottom of the pipe fitting and then enters the pipe fitting to abut against the bottom end surface of the die core, so that the die core is fixed by the upper die assembly and the column. In the state where the die core is fixed, the flanging punch sequentially penetrates through the upper die assembly and the pre-punched hole at the bottom of the pipe fitting and then enters the die hole in the direction of the die core to perform the inner flanging operation.

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