Large-diameter metal thin-wall three-way pipe flanging die

Abstract

The utility model belongs to the related technical field of metal material processing, and discloses a large-diameter metal thin-wall three-way pipe flanging die which comprises an upper die plate, a lower die plate, a female die, an upper die, a flaring male die and a driving assembly connected between the upper die plate and a male die guide rod. The lifting mechanism is used for converting the lifting motion of the upper die plate into the lifting motion of the male die guide rod and the flaring male die so as to execute flanging operation. According to the utility model, the flaring male die and the male die guide rod are pushed in, locked and pushed out during the up-and-down operation cycle gap of the die, so that the die is convenient to repeatedly assemble and disassemble, meanwhile, the warping influence of the flanging process on the main pipe is eliminated by closing the upper die and the lower die, the flanging quality is ensured, the production efficiency is improved, and the male die is convenient to maintain and replace.

Description

Technical Field

[0001] This utility model belongs to the technical field of metal material processing, and more specifically, relates to a flanged die for a large-diameter thin-walled metal tee pipe. Background Technology

[0002] Tee fittings are commonly used piping components, primarily installed at branch points of main pipelines to change the direction of gas or fluid. Metal tees generally consist of a main pipe and a branch pipe perpendicular to and connected to it. During service, metal tees must withstand significant gas pressure and impact momentum, while also resisting corrosion from the gas. Therefore, a smooth, continuous surface is particularly required at the branching points of the tee.

[0003] Traditional metal tee fittings involve drilling holes in the main pipe and then directly inserting branch pipes for welding to form a tee. Because the weld seam on the main pipe is a spatial curve, the welding process cannot be standardized. At the same time, the weld seam has low pressure resistance, low corrosion resistance, high resistance, and short service life.

[0004] Traditional hydraulic forming processes require large hydraulic presses and additional large hydraulic systems. This is particularly problematic for larger diameter tee fittings, where the high equipment requirements and costs make hydraulic forming unsuitable. Therefore, flanging has become the preferred method for forming metal tee pipes. Flanging processes for small-diameter metal tee pipes are relatively mature, simple to operate, and highly automated. However, flanging large-diameter metal tee pipes often requires a separate hydraulic system to provide the flanging force and action, reducing the applicability of the forming equipment. Existing flanging devices for large-diameter metal tee pipes often lack proper contact and fixation of the main pipe's outer cylindrical surface, causing warping and deformation of the non-contacting surface during flanging. Furthermore, the flaring punch used for flanging requires repeated installation and removal, which is inconvenient.

[0005] Therefore, there is an urgent need to design a large-diameter metal thin-walled tee flange mold that is easy to use reliably on ordinary hydraulic presses. Utility Model Content

[0006] In view of the above-mentioned defects or improvement needs of the existing technology, this utility model provides a large-diameter metal thin-walled tee pipe flanging mold. Its purpose is to provide a large-diameter metal thin-walled tee pipe flanging mold that does not require an additional hydraulic system and can be reliably and easily used on a general hydraulic press, thereby solving the technical problems in the existing technology such as the need for a separate hydraulic system, easy warping and deformation, and inconvenience in assembling and disassembling the flaring punch.

[0007] To achieve the above objectives, according to one aspect of this utility model, a large-diameter metal thin-walled tee pipe flanging mold is provided, comprising:

[0008] Upper template 1 is used to fix it to the upper worktable of a general hydraulic press;

[0009] The lower template 10 is used to fix the lower worktable of the general hydraulic press;

[0010] A concave mold 8 is disposed on the lower template 10, and its inner surface has a supporting concave surface that is adapted to the outer cylindrical surface of the main tube 5 to be processed. A through hole for branch tube forming is opened in the center of the concave mold 8.

[0011] The upper mold 2 is located below the upper template 1 and is vertically connected to the upper template 1. It is used to close with the concave mold 8 to clamp and fix the main tube 5.

[0012] The flaring punch 6 has a hollow hemispherical flange portion, and the flaring punch 6 is detachably connected to the upper end of the vertically arranged punch guide rod 7;

[0013] A drive assembly, connected between the upper template 1 and the punch guide rod 7, is used to convert the lifting motion of the upper template 1 into the lifting motion of the punch guide rod 7 and the flaring punch 6 to perform the flanging operation.

[0014] Preferably, the upper end of the punch guide rod 7 is provided with a locking part, and the lower end of the flared punch 6 is provided with a connecting part that cooperates with the locking part; when the flared punch 6 and the punch guide rod 7 are connected to the locking part through the connecting part and rotate relative to each other by a preset angle, the two are locked in the vertical direction.

[0015] Preferably, the locking part is a T-shaped structure with flattened sides, and the connecting part is a square hole opened at the lower end of the flared punch 6; the square hole can fit into the T-shaped structure and lock after rotating 90 degrees.

[0016] Preferably, the punch guide rod 7 is a stepped shaft structure, which includes, from top to bottom, an upper connecting section for connecting the flared punch 6, a positioning cylindrical section for positioning the side hole of the main tube 5, a guide cylindrical section for guiding, and a lower connecting section for connecting the drive assembly.

[0017] Preferably, the side of the positioning cylindrical section is provided with a guide slope to assist in the installation and alignment of the flaring punch 6.

[0018] Preferably, the driving component includes:

[0019] The upper template connecting rod 3 is fixedly connected to the upper template 1 at its upper end, and a limiting structure is provided on the rod body;

[0020] The push plate 11 is fixedly connected to the lower end of the punch guide rod 7, and is sleeved on the upper template connecting rod 3, and is located between the limiting structures;

[0021] The lifting and lowering movement of the upper template 1 is driven by the interaction between the limiting structure of the upper template connecting rod 3 and the push plate 11, thereby driving the lifting and lowering of the punch guide rod 7.

[0022] Preferably, the limiting structure includes an upper limiting block disposed above the push plate 11 and a lower limiting block disposed below the push plate 11.

[0023] Preferably, the upper mold 2 is connected to the upper template 1 via an elastic connector; the elastic connector includes a connecting rod passing through the upper template 1 and the upper mold 2, and a spring 4 sleeved on the connecting rod.

[0024] Preferably, a pad 9 for adjusting the height is provided between the lower template 10 and the concave mold 8.

[0025] Preferably, the radius of curvature of the hemispherical flange of the flaring punch 6 is matched with the diameter of the branch pipe to be formed, so as to ensure that the branch pipe has sufficient axial overlap length after flange.

[0026] In summary, compared with the prior art, the large-diameter metal thin-walled tee pipe flanging mold provided by this utility model has the following beneficial effects:

[0027] 1. High versatility and integration: The entire process of mold closing, flanging, and demolding is cleverly integrated into a single vertical stroke of a general-purpose hydraulic press, eliminating the need for any external auxiliary hydraulic or control systems, thus significantly reducing equipment investment and operational complexity.

[0028] 2. Excellent anti-deformation capability: The working sequence of "first clamping the mold in full circumference, then partially flanging" is adopted. The warping effect of the flanging process on the main pipe is eliminated by closing the upper and lower molds, which ensures the flanging quality and ensures the geometric accuracy and surface quality of the product.

[0029] 3. Quick mold change and convenient operation: The innovative quick-locking mechanism for the punch makes the loading and unloading of the flaring punch as simple as changing a drill bit, which greatly reduces equipment preparation time, improves production efficiency, and facilitates the maintenance and replacement of the punch.

[0030] 4. Compact structure and reliable operation: The functional modules are reasonably laid out and the motion chain is simple. The sequence of actions and force transmission are controlled by mechanical limit and spring buffer, and the working process is stable, reliable and repeatable.

[0031] 5. Wide range of applications: By changing the concave die, flared punch and adjusting pad of different sizes, it can adapt to the flange requirements of main pipes with different diameters and wall thicknesses within a certain range, and the mold has strong versatility. Attached Figure Description

[0032] Figure 1This is a longitudinal sectional view of the mold of this utility model in its initial loading state at the upper stop position.

[0033] Figure 2 This is a longitudinal sectional view of the mold of this utility model, showing the flanging action about to begin just after the upper mold and the lower mold have finished closing.

[0034] Figure 3 This is a longitudinal sectional view of the mold of this utility model when the flanging action is completed at the lower stop point.

[0035] Figure 4 This is a schematic diagram of the flaring punch in this utility model.

[0036] Figure 5 This is a schematic diagram of the punch guide rod in this utility model.

[0037] In all the accompanying drawings, the same reference numerals are used to denote the same elements or structures, wherein:

[0038] 1. Upper template; 2. Upper die; 3. Upper template connecting rod; 4. Spring; 5. Main tube; 6. Flared punch; 7. Punch guide rod; 8. Die; 9. Pad block; 10. Lower template; 11. Push plate. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model. Furthermore, the technical features involved in the various embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0040] Please see Figure 1 This utility model provides a reliable and easy-to-use large-diameter metal thin-walled tee pipe flanging mold, comprising:

[0041] Upper template 1 is used to fix it to the upper worktable of a general hydraulic press;

[0042] The lower template 10 is used to fix the lower worktable of the general hydraulic press;

[0043] A concave mold 8 is disposed on the lower template 10, and its inner surface has a supporting concave surface that is adapted to the outer cylindrical surface of the main tube 5 to be processed. A through hole for branch tube forming is opened in the center of the concave mold 8.

[0044] The upper mold 2 is located below the upper template 1 and is vertically connected to the upper template 1. It is used to close with the concave mold 8 to clamp and fix the main tube 5.

[0045] The flaring punch 6 has a hollow hemispherical flange portion, and the flaring punch 6 is detachably connected to the upper end of the vertically arranged punch guide rod 7;

[0046] A drive assembly, connected between the upper template 1 and the punch guide rod 7, is used to convert the lifting motion of the upper template 1 into the lifting motion of the punch guide rod 7 and the flaring punch 6 to perform the flanging operation.

[0047] Furthermore, the upper end of the punch guide rod 7 is provided with a locking part, and the lower end of the flared punch 6 is provided with a connecting part that cooperates with the locking part; when the flared punch 6 and the punch guide rod 7 are connected to the locking part through the connecting part and rotate relative to each other by a preset angle of 90 degrees, the two are locked in the vertical direction.

[0048] Furthermore, the locking part is a T-shaped structure with flattened sides, and the connecting part is a square hole opened at the lower end of the flared punch 6; the square hole can fit into the T-shaped structure and lock after rotating 90 degrees.

[0049] Further, please refer to Figure 5 The punch guide rod 7 is a stepped shaft structure, which includes, from top to bottom: an upper connecting section for connecting the flared punch 6, a positioning cylindrical section for positioning the side hole of the main tube 5, a guide cylindrical section for guiding, and a lower connecting section for connecting the drive assembly.

[0050] Furthermore, a guide slope is provided on the side of the positioning cylindrical section to assist in the installation and alignment of the flaring punch 6.

[0051] Furthermore, the driving component includes:

[0052] The upper template connecting rod 3 is fixedly connected to the upper template 1 at its upper end, and a limiting structure is provided on the rod body;

[0053] The push plate 11 is fixedly connected to the lower end of the punch guide rod 7, and is sleeved on the upper template connecting rod 3, and is located between the limiting structures;

[0054] The lifting and lowering movement of the upper template 1 is driven by the interaction between the limiting structure of the upper template connecting rod 3 and the push plate 11, thereby driving the lifting and lowering of the punch guide rod 7.

[0055] Furthermore, the limiting structure includes an upper limiting block disposed above the push plate 11 and a lower limiting block disposed below the push plate 11.

[0056] Furthermore, the upper mold 2 is connected to the upper template 1 via an elastic connector; the elastic connector includes a connecting rod passing through the upper template 1 and the upper mold 2, and a spring 4 sleeved on the connecting rod.

[0057] Furthermore, a pad 9 for adjusting the height is provided between the lower template 10 and the concave mold 8.

[0058] Further, please refer to Figure 4 The radius of curvature of the hemispherical flange of the flaring punch 6 is matched with the diameter of the branch pipe to be formed, so as to ensure that the branch pipe has sufficient axial overlap length after flange.

[0059] Please see Figures 1 to 3 The complete working cycle of the mold of this utility model is as follows:

[0060] S1: When template 1 is at its upper limit, please refer to [link / reference]. Figure 1 The upper die 2 and the concave die 8 are fully opened. The main tube 5 with side holes is placed into the concave die and positioned by the cylindrical surface of the upper middle part of the punch guide rod 7. Then, the flared punch 6, which is placed outside the concave die 8, is pushed towards the punch guide rod 7. At this time, the lower opening of the flared punch 6 is aligned with the T-shaped structure cut flat on both sides of the upper end of the punch guide rod 7. At the same time, there is a chamfered surface on one side of the cylindrical surface of the upper middle part of the punch guide rod 7 to assist the smooth lifting and pushing of the flared punch 6. Finally, the flared punch 6 is rotated 90 degrees and locked.

[0061] S2: Upper mold plate 1 moves downwards, upper mold 2 and cavity mold 8 close. Please refer to [link / reference]. Figure 2 The spring below the upper mold plate connecting rod 3 gradually stretches from the pre-compressed initial installation state and maintains pressure on the push plate 11, so that the punch guide rod 7 is always kept at the upper limit position, while the upper limit block of the upper mold connecting rod contacts the push plate 11.

[0062] S3: As the upper mold plate 1 continues to descend, the spring 4 of the upper mold connecting rod continues to compress, increasing the clamping force of the upper mold 2 and the die 8, thus eliminating the warping of the main tube caused by the flanging operation. Simultaneously, the upper limit block of the upper mold connecting rod pushes the push plate 11 downwards, which in turn pulls the punch guide rod 7 and the flaring punch 6 downwards, executing the flanging process. At the lower stop point, please refer to [link / reference needed]. Figure 3 At this point, the flaring punch 6 has completed the flanging of the branch pipe, and its vertical cylindrical surface has a sufficient overlap length with the branch pipe in the vertical direction.

[0063] S4: The upper mold plate 1 moves upward during the return stroke. Since the spring 4 of the upper mold connecting rod is in a compressed state, the upper mold 2 and the die 8 remain in the closed state. The upper mold connecting rod retracts, and the push plate 11 moves upward due to the action of the lower limit block of the upper mold connecting rod and the spring, thereby pushing the punch guide rod 7 and the flaring punch 6 upward, so that the vertical cylindrical surface of the flaring punch 6 disengages from the flanged branch pipe until the push plate 11 contacts the lower surface of the die 8.

[0064] S5: The upper mold plate 1 continues to move upward, and the limit block of the upper mold connecting rod drives the upper mold 2 to move upward, realizing the mold opening process;

[0065] S6: The flaring punch 6 rotates 90 degrees in the opposite direction, exits the punch guide rod 7, and is placed outside the die 8; at the same time, the tee pipe that has been flanged is taken out; one cycle of operation is completed.

[0066] The entire process is highly automated, requiring only simple loading and unloading and punch locking operations. This is achieved by adjusting the upper and lower limits of the stroke of the general-purpose hydraulic press and controlling the stamping cycle. No additional hydraulic or control system is needed, nor is mold handling required. The operation is safe, efficient, and produces stable quality.

[0067] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A large diameter metal thin-walled tee pipe flanging die, characterized by: include: Upper template (1) is used to fix the upper worktable of a general hydraulic press; The lower template (10) is used to fix the lower worktable of the general hydraulic press; A concave mold (8) is set on the lower template (10), and its inner surface has a supporting concave surface that is adapted to the outer cylindrical surface of the main tube (5) to be processed. A through hole for branch tube forming is opened in the center of the concave mold (8). The upper mold (2) is located below the upper template (1) and is vertically connected to the upper template (1) for closing with the concave mold (8) to clamp and fix the main tube (5). The flaring punch (6) has a hollow hemispherical flange portion, and the flaring punch (6) is detachably connected to the upper end of the vertically arranged punch guide rod (7); The drive assembly is connected between the upper template (1) and the punch guide rod (7) to convert the lifting motion of the upper template (1) into the lifting motion of the punch guide rod (7) and the flaring punch (6) to perform the flanging operation.

2. A large diameter metal thin wall tee pipe flanging die according to claim 1, characterized in that: The upper end of the punch guide rod (7) is provided with a locking part, and the lower end of the flared punch (6) is provided with a connecting part that cooperates with the locking part; when the flared punch (6) and the punch guide rod (7) are connected to the locking part through the connecting part and rotate relative to each other by a preset angle, the two are locked in the vertical direction.

3. A large diameter metal thin wall tee pipe flanging die as set forth in claim 2, wherein: The locking part is a T-shaped structure with flattened sides, and the connecting part is a square hole opened at the lower end of the flared punch (6); the square hole can fit into the T-shaped structure and lock after rotating 90 degrees.

4. The large-diameter metal thin-walled tee pipe flanging mold as described in claim 1, characterized in that: The punch guide rod (7) is a stepped shaft structure, which includes, from top to bottom: an upper connecting section for connecting the flared punch (6), a positioning cylindrical section for positioning the side hole of the main tube (5), a guide cylindrical section for guiding, and a lower connecting section for connecting the drive assembly.

5. A large diameter metal thin wall tee pipe flanging die as claimed in claim 4, wherein: The side of the positioning cylindrical section is provided with a guide slope to assist in the installation and alignment of the flaring punch (6).

6. A large diameter metal thin wall tee pipe flanging die as set forth in claim 1, wherein: The driving component includes: The upper template connecting rod (3) is fixedly connected to the upper template (1) at its upper end, and a limiting structure is provided on the rod body; The push plate (11) is fixedly connected to the lower end of the punch guide rod (7) and sleeved on the upper template connecting rod (3), and is located between the limiting structures; The lifting and lowering movement of the upper template (1) is driven by the interaction between the limiting structure of the upper template connecting rod (3) and the push plate (11), which drives the punch guide rod (7) to lift and lower.

7. A large diameter metal thin walled tee pipe flanging die as claimed in claim 6 wherein: The limiting structure includes an upper limit block disposed above the push plate (11) and a lower limit block disposed below the push plate (11).

8. A large diameter metal thin wall tee pipe flanging die as claimed in claim 1, wherein: The upper mold (2) is connected to the upper template (1) through an elastic connector; the elastic connector includes a connecting rod passing through the upper template (1) and the upper mold (2) and a spring (4) sleeved on the connecting rod.

9. A large diameter metal thin wall tee pipe flanging die as claimed in claim 1, wherein: A pad (9) for adjusting the height is provided between the lower template (10) and the concave mold (8).

10. A large diameter metal thin wall tee pipe flanging die as claimed in claim 1, wherein: The radius of curvature of the hemispherical flange of the flaring punch (6) matches the diameter of the branch pipe to be formed, so as to ensure that the branch pipe has sufficient axial overlap length after flange.

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