A bend forming die

Abstract

The utility model relates to the technical field of elbow pipe manufacturing, more particularly to an elbow forming die, including upper die and lower die, the upper die includes pressure roller, first upper die block and second upper die block, first upper die block and second upper die block are all with pressure roller rotation connection, first upper die block and second upper die block are located pressure roller's both sides respectively, the lower die includes mounting seat, first lower die block and second lower die block, first lower die block and second lower die block are all with mounting seat rotation connection, and the drive mechanism is equipped with punch for sealing the both ends of pipe embryo on first lower die block and second lower die block, and punch is provided with liquid injection channel. The utility model discloses through setting drive mechanism and punch, injects emulsion into the pipe embryo before bending, makes the metal flow of inner arc place compressed when bending, compensates other parts to be thinned because of the expansion, to obtain the elbow of uniform wall thickness, avoid the thickness of elbow to change greatly.

Description

Technical Field

[0001] This utility model relates to the technical field of manufacturing elbow pipe fittings, and more specifically, to an elbow forming mold. Background Technology

[0002] Elbows are indispensable connectors in piping systems. Their main function is to enable pipe turning, connection, and diversion, greatly improving the flexibility and adaptability of pipe layout. In the manufacturing of elbows, pipe blanks are usually produced first, and then the pipe blanks are pressed into elbows using molds.

[0003] Existing technology discloses an outer mold structure for stamping pipe elbows, including a support block, a first upper module, a second upper module, a first lower module, a second lower module, and a base. Under the action of a hydraulic rod, the first and second upper modules rotate circumferentially around the center point of the cross-section of the support block. Simultaneously, the first and second lower modules rotate circumferentially around their connection points with the base, causing the upper and lower parts of the pipe to be bent simultaneously. By adopting the above technical solution, the bending angle is easy to control, the operation is flexible, and the regular forming of the bent surface can be guaranteed. However, after the pipe blank is pressed into an elbow, the thickness of the elbow varies greatly at different locations, making it difficult to meet the actual use requirements. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of existing technology where the thickness of elbows varies greatly at different locations, and to provide an elbow forming mold that avoids large variations in the thickness of elbows.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] A bend forming mold is provided, including an upper mold and a lower mold. The upper mold includes a pressure roller, a first upper module and a second upper module, both of which are rotatably connected to the pressure roller and are located on opposite sides of the pressure roller. The lower mold includes a mounting base, a first lower module and a second lower module, both of which are rotatably connected to the mounting base. Both the first lower module and the second lower module are provided with a driving mechanism. The output end of the driving mechanism is connected to a punch for sealing both ends of the tube blank, and the punch has a liquid injection channel.

[0007] This utility model discloses a bend forming mold. The lower mold is mounted on a worktable, and the upper mold is mounted on a lifting mechanism. When forming the bend, the tube blank is placed on the lower mold, and the section to be bent is positioned between the first and second lower modules. The drive mechanism is activated to move the punches, inserting them into the tube blank from both ends. The two punches seal both ends of the tube blank. Emulsion is injected into the tube blank through the injection channel. The lifting mechanism is then activated, moving the upper mold towards the lower mold. Once the first and second upper modules are in contact with the first and second lower modules respectively, the lifting mechanism continues to press down. The first and second upper modules rotate around the pressure roller, and the first and second lower modules rotate around the mounting base. Simultaneously, the punches rotate with the first and second lower modules, ensuring the punches remain inserted into the tube blank and consistently seal both ends. This process bends the tube blank to the desired angle. After bending is complete, the lifting mechanism is activated to raise the upper mold, and the drive mechanism is activated to retract the punches and remove the bend. By setting up a drive mechanism and a punch, an emulsion is injected into the tube blank before bending. During bending, the compressed metal at the inner arc flows to compensate for the thinning of other parts due to the expansion of the diameter, thereby obtaining an elbow with uniform wall thickness and avoiding large changes in the thickness of the elbow.

[0008] Furthermore, the first upper module, the second upper module, and the pressure roller are each provided with a coaxially corresponding upper semi-circular tube groove structure, and the first lower module and the second lower module are each provided with a coaxially corresponding lower semi-circular tube groove structure. This allows the tube blank to fit snugly against the upper and lower semi-circular tube groove structures during bending, and the deformation process of the blank is controlled by the mandrel, thereby avoiding significant changes in the thickness of the bend.

[0009] Furthermore, the outer diameter of the punch is equal to the inner diameter of the tube blank. This allows the punch to seal both ends of the tube blank, preventing the emulsion from flowing out from both ends, thus obtaining an elbow with uniform wall thickness.

[0010] Furthermore, the direction of movement of the punch is coaxial with the lower semi-circular tube groove structure. This facilitates sealing of both ends of the tube blank by the punch.

[0011] Furthermore, the upper mold also includes a mounting frame, which comprises a first mounting component and a second mounting component. The second mounting component is slidably connected to the first mounting component, and the pressure roller is connected to the first mounting component. The first upper module and the second upper module are rotatably connected to both ends of the second mounting component, respectively. By allowing the second mounting component to slidably connect to the first mounting component, the movement of the first mounting component is guided, thereby guiding the movement of the first and second upper modules, allowing the first and second upper modules to rotate synchronously and preventing significant changes in the thickness of the elbow.

[0012] Further, the first mounting assembly includes a spindle connecting block and a pressure roller connecting block. Both ends of the pressure roller connecting block are connected to the spindle connecting block and the pressure roller, respectively. The second mounting assembly is slidably connected to the spindle connecting block. The pressure roller connecting block has a geometric dimension larger than the corresponding dimension of the spindle connecting block in at least one horizontal direction. The second mounting assembly slides on the spindle connecting block, and the sliding stroke of the second mounting assembly is limited, thereby limiting the rotation angle of the first upper module and the second upper module.

[0013] Furthermore, the first mounting assembly also includes a washer disposed on the pressure roller connecting block, and the washer is located between the second mounting assembly and the pressure roller connecting block. The washer cushions the second mounting assembly, preventing it from colliding with the pressure roller connecting block during movement.

[0014] Furthermore, when the second mounting component abuts against the gasket, the first upper module and the second upper module are located on the same plane. This ensures that the first and second upper modules are on the same plane during reset, allowing them to fit against the first and second lower modules during initial downward pressure.

[0015] Furthermore, the second mounting assembly includes a guide block, a first connecting rod, and a second connecting rod. The guide block is slidably connected to the main shaft connecting block. The first connecting rod and the second connecting rod are located at opposite ends of the guide block. The two ends of the first connecting rod are rotatably connected to the guide block and the first upper module, respectively, and the two ends of the second connecting rod are rotatably connected to the guide block and the second upper module, respectively. The guide block slides on the main shaft connecting block, causing the first and second connecting rods to rotate, thereby synchronously rotating the first and second upper modules and preventing significant changes in the thickness of the elbow.

[0016] Furthermore, both the first upper module and the second upper module include a mounting block and a forming upper die. The two ends of the mounting block are rotatably connected to the pressure roller and the second mounting assembly, respectively. The forming upper die is detachably connected to the mounting block, and the upper semi-circular tube groove structure is provided on the forming upper die. When bending tube blanks of different sizes, different forming upper dies can be replaced, allowing this elbow forming mold to be suitable for forming elbows of different diameters.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] 1. The present invention provides a bend forming mold, which, by setting a driving mechanism and a punch, injects emulsion into the tube blank before bending. During bending, the compressed metal at the inner arc flows to compensate for the thinning of other parts due to the expansion of the diameter, thereby obtaining a bend with uniform wall thickness and avoiding large changes in the thickness of the bend.

[0019] 2. The present invention provides a bend forming mold that allows the tube blank to fit into the upper and lower semi-circular tube groove structures during bending, and controls the deformation process of the blank through the core mold, thereby avoiding significant changes in the thickness of the bend.

[0020] 3. The elbow forming mold of this utility model guides the movement of the first mounting component by slidingly connecting the second mounting component with the first mounting component, thereby guiding the movement of the first upper module and the second upper module, so that the first upper module and the second upper module rotate synchronously and avoid large changes in the thickness of the elbow. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the elbow forming mold in Example 1;

[0022] Figure 2 This is a schematic diagram of the upper mold in Example 1;

[0023] Figure 3 This is a schematic diagram of the lower mold structure;

[0024] Figure 4 This is a schematic diagram of the elbow forming mold in Example 2;

[0025] Figure 5 This is a schematic diagram of the upper mold from a first-view perspective in Embodiment 2;

[0026] Figure 6 This is a schematic diagram of the upper mold from a second perspective in Embodiment 2.

[0027] In the attached diagram: 100, upper die; 110, pressure roller; 111, upper semi-circular tube groove structure; 120, first upper module; 121, mounting block; 122, forming upper die; 130, second upper module; 140, first mounting component; 141, main shaft connecting block; 142, pressure roller connecting block; 143, washer; 150, second mounting component; 151, guide block; 152, first connecting rod; 153, second connecting rod; 200, lower die; 210, first lower module; 211, lower semi-circular tube groove structure; 220, second lower module; 300, drive mechanism; 400, punch. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. The present utility model will be further described below with reference to specific embodiments. The accompanying drawings are only for illustrative purposes and represent only schematic diagrams, not actual pictures, and should not be construed as limiting the present patent. In order to better illustrate the embodiments of the present utility model, some parts in the drawings may be omitted, enlarged or reduced, and do not represent the actual product size. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0029] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms describing positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances. Furthermore, if the embodiments of this utility model involve descriptions such as "first" and "second," these descriptions are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" and "second" may explicitly or implicitly include at least one of those features. In addition, the meaning of "and / or" in the text is that it includes three parallel options. Taking "A and / or B" as an example, it includes option A, option B, or an option that satisfies both A and B.

[0030] Example 1

[0031] This embodiment is a first embodiment of a bend forming mold, such as... Figure 1 As shown, it includes an upper mold 100 and a lower mold 200, as follows: Figure 2 As shown, the upper mold 100 includes a pressure roller 110, a first upper module 120, and a second upper module 130. Both the first upper module 120 and the second upper module 130 are rotatably connected to the pressure roller 110. The first upper module 120 and the second upper module 130 are located on opposite sides of the pressure roller 110, as shown. Figure 3 As shown, the lower mold 200 includes a mounting base, a first lower module 210, and a second lower module 220. Both the first lower module 210 and the second lower module 220 are rotatably connected to the mounting base, as shown. Figure 1 and Figure 3As shown, both the first lower module 210 and the second lower module 220 are equipped with a drive mechanism 300. The output end of the drive mechanism 300 is connected to a punch 400 for sealing both ends of the tube blank. The punch 400 has an injection channel.

[0032] like Figure 2 As shown, the first upper module 120, the second upper module 130, and the pressure roller 110 are each provided with a coaxially corresponding upper semi-circular tube groove structure 111, and the first lower module 210 and the second lower module 220 are each provided with a coaxially corresponding lower semi-circular tube groove structure 211. This allows the tube blank to fit snugly against the upper and lower semi-circular tube groove structures 111 and 211 during bending. The deformation process of the blank is controlled by the mandrel, thereby preventing significant changes in the thickness of the bend. The upper semi-circular tube groove structure 111 on the pressure roller 110 is arranged along the circumference of the pressure roller 110, facilitating the forming of bends at different angles.

[0033] The outer diameter of the punch 400 is equal to the inner diameter of the tube blank. This allows the punch 400 to seal both ends of the tube blank, preventing the emulsion from flowing out from both ends, thus obtaining an elbow with uniform wall thickness.

[0034] The movement direction of the punch 400 is coaxial with the lower semi-circular tube groove structure 211. This facilitates the punch 400 sealing both ends of the elbow.

[0035] In this embodiment, as Figures 1 to 3 As shown, multiple sets of upper mold 100 and lower mold 200 can be arranged side by side, so that a multi-bend pipe fitting can be produced in one bending, thereby improving production efficiency and saving labor costs.

[0036] The working principle of a bend forming mold in this embodiment is as follows:

[0037] Install the lower die 200 on the worktable and the upper die 100 on the lifting mechanism. During the forming of the bent pipe, as follows... Figure 3As shown, the tube blank is placed on the lower semicircular tube groove structure 211 of the lower mold 200. The part to be bent is placed between the first lower module 210 and the second lower module 220. The drive mechanism 300 is activated to move the punches 400, inserting the two punches 400 into the tube blank from both ends. The punches 400 seal both ends of the tube blank. Emulsion is injected into the tube blank through the injection channel. At the same time, the punches 400 press the tube blank down to the lower semicircular tube groove structure 211 to fix the tube blank. The lifting mechanism is activated to move the upper mold 100 toward the lower mold 200. When the first upper module 120 and the second upper module 130 are respectively attached to the first lower module 210 and the second lower module 220, that is, the upper part of the tube blank is bent... After the half-section is fitted with the upper semi-circular tube groove structure 111, the lifting mechanism continues to press down. The first upper module 120 and the second upper module 130 rotate around the pressure roller 110, and the first lower module 210 and the second lower module 220 rotate around the mounting base. At the same time, the punch 400 also rotates with the rotation of the first lower module 210 and the second lower module 220, ensuring that the punch 400 is always inserted into the tube blank. The punch 400 maintains a good seal at both ends of the tube blank, bending the tube blank to achieve the ideal angle. After bending is completed, the lifting mechanism is activated to raise the upper die 100, forming the bend. The high-pressure punch 400 is depressurized and extends, and the lower die 200 resets under the gravity of the two-end drive mechanisms 300, removing the bend. In this embodiment, a telescopic mechanism or other power mechanism can also be provided to drive the first lower module 210 and the second lower module 220 on the lower die 200 to reset. By setting up a drive mechanism 300 and a punch 400, emulsion is injected into the tube blank before bending. During bending, the compressed metal at the inner arc flows to compensate for the thinning of other parts due to diameter expansion. That is, the middle bend is compensated at both ends. Combined with precise hydraulic expansion, and the deformation process of the blank controlled by the mandrel, the packaging tube blank is kept close to the mold cavity while bending, achieving the expected shape and effect. This results in a bend with uniform wall thickness, avoiding significant variations in the thickness of the bend. This reduces the thickness and explosion rate, ensuring molding quality. It also reduces the scrap rate, significantly improving production efficiency.

[0038] Furthermore, since the punch 400 rotates along with the first lower module 210 and the second lower module 220 during the forming process, it will not affect the forming of both ends of the elbow, and the required elbow can be obtained after forming.

[0039] Example 2

[0040] This embodiment is the second embodiment of the elbow forming mold. This embodiment is similar to the first embodiment, except that, as shown in the example... Figure 4 As shown, the upper mold 100 also includes a mounting bracket, such as Figure 5As shown, the mounting bracket includes a first mounting assembly 140 and a second mounting assembly 150. The second mounting assembly 150 is slidably connected to the first mounting assembly 140. A pressure roller 110 is connected to the first mounting assembly 140. A first upper module 120 and a second upper module 130 are rotatably connected to both ends of the second mounting assembly 150, respectively. By allowing the second mounting assembly 150 to slidably connect to the first mounting assembly 140, the movement of the first mounting assembly 140 is guided, thereby guiding the movement of the first upper module 120 and the second upper module 130, allowing the first upper module 120 and the second upper module 130 to rotate synchronously, thus preventing significant changes in the thickness of the elbow.

[0041] like Figure 6 As shown, the first mounting assembly 140 includes a main shaft connecting block 141 and a pressure roller connecting block 142. Both ends of the pressure roller connecting block 142 are connected to the main shaft connecting block 141 and the pressure roller 110, respectively. The second mounting assembly 150 is slidably connected to the main shaft connecting block 141. The geometric dimension of the pressure roller connecting block 142 in at least one horizontal direction is larger than the corresponding dimension of the main shaft connecting block 141. The second mounting assembly 150 slides on the main shaft connecting block 141, and the sliding stroke of the second mounting assembly 150 is limited, thereby limiting the rotation angle of the first upper module 120 and the second upper module 130. In this embodiment, the first mounting assembly 140 also includes a connecting flange, which is connected to the end of the main shaft connecting block 141 away from the pressure roller connecting block 142, facilitating connection to the lifting mechanism via the connecting flange.

[0042] The first mounting component 140 also includes a washer 143, which is disposed on the pressure roller connecting block 142 and located between the second mounting component 150 and the pressure roller connecting block 142. The washer 143 cushions the second mounting component 150, preventing it from colliding with the pressure roller connecting block 142 during movement.

[0043] When the second mounting component 150 abuts against the washer 143, the first upper module 120 and the second upper module 130 are located on the same plane. This ensures that the first upper module 120 and the second upper module 130 are on the same plane during reset, allowing them to fit against the first lower module 210 and the second lower module 220 during initial downward pressure.

[0044] like Figure 6As shown, the second mounting assembly 150 includes a guide block 151, a first connecting rod 152, and a second connecting rod 153. The guide block 151 is slidably connected to the main shaft connecting block 141. The first connecting rod 152 and the second connecting rod 153 are located at opposite ends of the guide block 151. The two ends of the first connecting rod 152 are rotatably connected to the guide block 151 and the first upper module 120, respectively. The two ends of the second connecting rod 153 are rotatably connected to the guide block 151 and the second upper module 130, respectively. The guide block 151 slides on the main shaft connecting block 141, causing the first connecting rod 152 and the second connecting rod 153 to rotate, thereby synchronously driving the first upper module 120 and the second upper module 130 to rotate, thus preventing significant changes in the thickness of the elbow.

[0045] Example 3

[0046] This embodiment is the third embodiment of the elbow forming mold. This embodiment is similar to the first embodiment, except that, as Figure 5 As shown, both the first upper module 120 and the second upper module 130 include a mounting block 121 and a forming upper mold 122. The two ends of the mounting block 121 are rotatably connected to the pressure roller 110 and the second mounting component 150, respectively. The forming upper mold 122 is detachably connected to the mounting block 121, and the upper semi-circular tube groove structure 111 is provided on the forming upper mold 122.

[0047] When bending tube blanks of different sizes, different forming upper dies 122 can be replaced so that this elbow forming die can be used to form elbows of different diameters.

[0048] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0049] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A bend forming mold, comprising an upper mold (100) and a lower mold (200), wherein the upper mold (100) includes a pressure roller (110), a first upper module (120) and a second upper module (130), the first upper module (120) and the second upper module (130) being rotatably connected to the pressure roller (110), the first upper module (120) and the second upper module (130) being located on both sides of the pressure roller (110), and the lower mold (200) including a mounting base, a first lower module (210) and a second lower module (220), the first lower module (210) and the second lower module (220) being rotatably connected to the mounting base, characterized in that, Both the first lower module (210) and the second lower module (220) are provided with a drive mechanism (300). The output end of the drive mechanism (300) is connected to a punch (400) for sealing both ends of the tube blank. The punch (400) has an injection channel.

2. The elbow forming mold according to claim 1, characterized in that, The first upper module (120), the second upper module (130) and the pressure roller (110) are respectively provided with coaxial corresponding upper semi-circular tube groove structures (111), and the first lower module (210) and the second lower module (220) are respectively provided with coaxial corresponding lower semi-circular tube groove structures (211).

3. The elbow forming mold according to claim 2, characterized in that, The outer diameter of the punch (400) is equal to the inner diameter of the tube blank.

4. The elbow forming mold according to claim 3, characterized in that, The direction of movement of the punch (400) is coaxial with the lower semi-circular tube groove structure (211).

5. The elbow forming mold according to any one of claims 1 to 4, characterized in that, The upper mold (100) also includes a mounting frame, which includes a first mounting component (140) and a second mounting component (150). The second mounting component (150) is slidably connected to the first mounting component (140). The pressure roller (110) is connected to the first mounting component (140). The first upper module (120) and the second upper module (130) are rotatably connected to both ends of the second mounting component (150).

6. The elbow forming mold according to claim 5, characterized in that, The first mounting assembly (140) includes a spindle connecting block (141) and a pressure roller connecting block (142). The two ends of the pressure roller connecting block (142) are respectively connected to the spindle connecting block (141) and the pressure roller (110). The second mounting assembly (150) is slidably connected to the spindle connecting block (141). The geometric dimension of the pressure roller connecting block (142) in at least one horizontal direction is larger than the corresponding dimension of the spindle connecting block (141).

7. The elbow forming mold according to claim 6, characterized in that, The first mounting assembly (140) further includes a washer (143) disposed on the pressure roller connecting block (142) and located between the second mounting assembly (150) and the pressure roller connecting block (142).

8. The elbow forming mold according to claim 7, characterized in that, When the second mounting component (150) abuts against the gasket (143), the first upper module (120) and the second upper module (130) are located on the same plane.

9. The elbow forming mold according to claim 6, characterized in that, The second mounting assembly (150) includes a guide block (151), a first connecting rod (152), and a second connecting rod (153). The guide block (151) is slidably connected to the main shaft connecting block (141). The first connecting rod (152) and the second connecting rod (153) are located at both ends of the guide block (151). The two ends of the first connecting rod (152) are rotatably connected to the guide block (151) and the first upper module (120), respectively. The two ends of the second connecting rod (153) are rotatably connected to the guide block (151) and the second upper module (130), respectively.

10. The elbow forming mold according to claim 5, characterized in that, Both the first upper module (120) and the second upper module (130) include a mounting block (121) and a forming upper mold (122). The two ends of the mounting block (121) are rotatably connected to the pressure roller (110) and the second mounting assembly (150) respectively. The forming upper mold (122) is detachably connected to the mounting block (121). The upper semi-circular tube groove structure (111) is provided on the forming upper mold (122).

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