Forming device for U-shaped pipe machining

Abstract

The invention relates to the technical field of U-shaped pipe machining, and provides a forming device for U-shaped pipe machining, a forming cavity is formed between an upper mold and a lower mold, a mold core frame is movably arranged on a sliding table, a mold core assembly comprises two sets of separable mold cores, the separable mold cores are arranged on the mold core frame, and the two sets of separable mold cores enter or retreat from the two ends of the forming cavity correspondingly. The medium supply device is arranged on the sliding table and used for enabling the two sets of split mold cores to be matched to form a complete mold core or releasing matching and splitting the mold core, the split mold cores are provided with through holes, after the two sets of split mold cores are matched to form the complete mold core, the through holes in the two sets of split mold cores are communicated to form a medium conveying channel, and the medium supply device is arranged on the sliding table. The two ends of the medium conveying channel are connected with the medium supply device so that circulation can be formed in the medium conveying channel. By means of the technical scheme, the problems that in the prior art, due to the fact that a U-shaped pipe is large in bending degree and complex in structure, raw materials are not prone to flowing stably, and a cavity is not prone to being evenly filled are solved.

Description

Technical Field

[0001] The invention relates to the technical field of U-shaped tube processing, and in particular to a forming device for U-shaped tube processing. Background Art

[0002] With the continuous development of modern industry, U-shaped tubes are widely used in many fields, such as automobile manufacturing, aerospace, electronic equipment, chemical pipelines, etc. These fields have higher and higher requirements on the quality and performance of U-shaped tubes, requiring them not only to have precise dimensions and good appearance, but also to have excellent mechanical properties and reliable sealing. However, due to the special shape of U-shaped tubes, their processing faces many technical difficulties.

[0003] The U-shaped tube has a large curvature and a complex structure, which makes it difficult for the raw material to flow stably during the injection molding process, and it is difficult to ensure that the raw material can evenly fill the entire cavity. When the raw material cannot flow evenly, it is easy to be insufficiently filled in some parts, resulting in uneven local wall thickness of the U-shaped tube, affecting its strength and service life.

[0004] In addition, the complex structure of the U-tube also makes the cooling process after injection molding very slow. On the one hand, the bending part and internal structure of the U-tube are not conducive to the dissipation of heat, resulting in a long cooling time and reduced production efficiency. Moreover, the traditional external cooling method can only act on the outer surface of the U-tube and cannot effectively cool its internal structure. This makes the internal cooling speed of the U-tube much lower than that of the outside, which easily leads to a large temperature difference between the inside and the outside. This temperature difference may cause stress concentration in the U-tube during the cooling process, thereby affecting its dimensional accuracy and mechanical properties.

[0005] In order to meet the high quality requirements of modern industry for U-shaped tubes and solve the problems existing in the prior art, it is particularly urgent to develop a new type of forming device for U-shaped tube processing. Summary of the invention

[0006] The present invention provides a U-shaped tube forming device, which solves the problem in the related art that the raw material is not easy to flow stably and is not easy to evenly fill the cavity due to the large bending degree and complex structure of the U-shaped tube.

[0007] The technical solution of the present invention is as follows: A U-shaped tube processing forming device comprises a frame, an upper die, a slide, a lower die, a core frame, a core assembly and a medium supply device, wherein the upper die is slidably arranged on the frame, the slide is slidably arranged on the frame, the lower die is arranged on the slide, a forming cavity is formed between the upper die and the lower die, and the core frame is movably arranged on the slide. The mold core assembly includes two groups of separable mold cores, which are arranged on the mold core frame. After the mold core frame moves, the two groups of separable mold cores respectively enter or exit the two ends of the molding cavity, so as to make the two groups of separable mold cores cooperate to form a complete mold core, or release the cooperation and split the mold core. The separable mold core has a through hole. After two groups of the separable mold cores are matched to form a complete mold core, the through holes on the two groups of the separable mold cores are connected to form a medium conveying channel. The medium supply device is arranged on the slide, and the two ends of the medium conveying channel are respectively connected to the medium supply device to make the medium conveying channel form a circulation.

[0008] Optionally, there are multiple through holes, and the multiple through holes are evenly distributed along the circumference of the separable mold core, and the cross section of the through hole is arc-shaped. The core frame is provided with an inlet and a return port, and the two ends of the medium conveying channel are respectively connected to the inlet and the return port, and the inlet and the return port are respectively connected to the medium supply device by means of connecting pipes, so as to form a circulation in the medium conveying channel.

[0009] Optionally, the separable mold core includes a straight mold section and a curved mold section, one end of the straight mold section is arranged on the mold core frame, and the other end can be movably connected to the curved mold section, and both the straight mold section and the curved mold section have the through hole. After the straight mold section and the curved mold section are matched, the through holes of the straight mold section and the curved mold section are connected.

[0010] Optionally, the bending mold section includes a plurality of bending mold cores which can be flexibly connected end to end in sequence. One end of the straight mold section is arranged on the mold core frame, and the other end can be flexibly connected to the bending mold core located at the end of the bending mold section. Both ends of the bending mold core respectively have a clamping part and a clamping groove for clamping with adjacent bending mold cores respectively.

[0011] Optionally, it also includes a connecting rod, and both ends of the connecting rod are respectively rotatably and slidably arranged on two adjacent bending model cores.

[0012] Optionally, the bending model core has a slide groove and also includes a positioning pin, and the positioning pin is arranged at the end of the connecting rod, and two positioning pins are respectively located in the slide grooves of two adjacent bending model cores.

[0013] Optionally, it also includes a movable frame and a core rod, wherein the movable frame is movably arranged on the slide, the core rod is arranged on the movable frame, the curved mold core, the straight mold section and the mold core frame have a through core hole, and the core rod is located in the core hole.

[0014] Optionally, it further comprises hook 1 and hook 2, wherein hook 1 is arranged on the core frame, and hook 2 is swingably arranged on the movable frame, and hook 2 is engaged with or unengaged from hook 1 after swinging.

[0015] Optionally, the slide has a limiting surface, the second hook abuts against the limiting surface and slides on the limiting surface, the limiting surface has a limiting groove for accommodating the second hook, and a torsion spring is provided at the hinge point of the second hook for providing force for the second hook to approach the limiting surface.

[0016] Optionally, it also includes a trimming pressure plate and a discharge ejector rod. The trimming pressure plate is lifted and slidably disposed on the frame. The trimming pressure plate is provided with a clearance hole. The shape of the clearance hole matches the contour of the molding cavity and is used for allowing the product to pass through. After sliding, the trimming pressure plate is used to abut against the lower mold and press the flash on the edge of the product. The inner wall of the molding cavity has an ejection hole, and the discharge ejector rod is slidably disposed in the ejection hole.

[0017] The working principle and beneficial effects of the present invention are: During the U-shaped tube processing, the upper die is slidably mounted on the frame with the help of a hydraulic press to ensure that the upper die can move up and down stably. The slide is slidably mounted on the frame in the horizontal direction, and the lower die is set on the slide. The position of the lower die can be easily adjusted by moving the slide, which is convenient for demoulding. The core frame is also mounted on the slide and can move on the slide.

[0018] The core assembly consists of two groups of separable cores, which are installed on the core frame. The separable core is actually a complete core split into several sections, and the sections are movably connected. When injection molding is required, the core frame is moved so that the two groups of separable cores enter the two ends of the molding cavity respectively. At this time, the two groups of separable cores cooperate with each other to form a complete core, providing a stable internal support structure for injection molding. Then, the molten plastic raw material is injected into the molding cavity between the upper mold and the lower mold.

[0019] Through holes are designed on the separable mold core so that after the separable mold core is assembled, the through holes on the separable mold core can be connected to form a medium conveying channel. By connecting the two ends of the medium conveying channel to the medium supply device, a circulating passage is formed, and auxiliary medium can be conveyed into the mold core and the medium can be circulated. For example, during the injection molding process, in order to ensure the fluidity of the raw material, a hot medium, such as high-temperature gas, can be conveyed into the through hole of the separable mold core. The hot medium flows in the through hole, and the temperature of the mold core is increased through heat transfer, thereby improving the fluidity of the raw material, ensuring that the raw material can evenly fill the entire cavity, avoiding insufficient filling and uneven local wall thickness. When the injection molding is completed, when the product needs to be cooled, it is switched to conveying a cold medium, such as a low-temperature gas. The cold medium forms a cycle in the through hole, quickly takes away the heat inside the product, and accelerates the cooling speed. Since the cold medium acts directly on the inside of the product, compared with the traditional external cooling method, it can effectively reduce the temperature difference between the inside and outside of the product, reduce stress concentration, and improve the dimensional accuracy and mechanical properties of the product. The switching between hot medium and cold medium can be achieved through the temperature control function of the medium supply device, and can also be achieved by replacing different medium supply devices.

[0020] When the product is cooled, the mold core frame is moved to allow the two sets of separable mold cores to exit the molding cavity. During the exit process, the separable mold cores are automatically separated to facilitate demolding the formed U-shaped tube from the mold core.

[0021] This U-tube processing molding device has many significant beneficial effects. First, through the design of the separable mold core, a complete mold core can be formed during injection molding to ensure the normal progress of injection molding, and it can be automatically split during demolding, which is convenient and quick, greatly improving production efficiency. Secondly, a through hole is set on the separable mold core and connected to a medium supply device, which realizes the function of transporting hot medium during injection molding to ensure the fluidity of raw materials, and transporting cold medium during cooling to accelerate the internal cooling of the product. This not only solves the problem that the raw materials are not easy to flow stably and fill the mold cavity evenly due to the large bending degree and complex structure of the U-tube, but also significantly shortens the cooling time and improves production efficiency. At the same time, the internal cooling method can effectively reduce the temperature difference between the inside and outside of the product, reduce stress concentration, improve the dimensional accuracy and mechanical properties of the U-tube, and meet the high quality requirements of modern industry for U-tubes. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The preferred implementation modes will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present invention.

[0023] Figure 1 It is a structural schematic diagram of a forming device for processing a U-shaped tube; Figure 2 It is a structural schematic diagram of the lower mold; Figure 3It is a structural schematic diagram of the core component at one angle; Figure 4 It is a structural schematic diagram of the mold core assembly from another angle; Figure 5 This is a structural schematic diagram of the core assembly from another angle; Figure 6 It is a structural schematic diagram of the bending model core at an angle; Figure 7 It is a structural schematic diagram of the bending model core from another angle; Figure 8 It is a structural schematic diagram of the trimming plate; Fig. 9 It is a structural schematic diagram of the discharge ejector rod; Fig.10 It is a schematic diagram of the structure after the core components are assembled.

[0024] In the figure: 1, frame, 2, upper mold, 3, slide, 4, lower mold, 5, core frame, 6, core assembly, 7, medium supply device, 8, molding cavity, 61, separable core, 9, through hole, 10, medium conveying channel, 11, inlet, 12, return port, 13, connecting pipe, 611, straight mold section, 612, bent mold section, 6121, bent mold core, 14, clamping part, 15, clamping groove, 16, connecting rod, 17, slide groove, 18, positioning pin, 19, movable frame, 20, core rod, 21, core hole, 22, hook 1, 23, hook 2, 24, limiting surface, 25, limiting groove, 26, torsion spring, 27, trimming pressure plate, 28, discharge ejector rod, 29, clearance hole, 30, ejection hole. DETAILED DESCRIPTION

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0026] In order to simplify the drawings, only the parts related to the invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically shown, or only one of them is marked. In this article, "one" not only means "only one", but also means "more than one", and "several" includes "two" and "more than two".

[0027] In this document, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0029] Reference Figure 1 to Figure 10 , which is the first embodiment of the present invention, proposes a U-shaped tube processing forming device, including a frame 1, an upper mold 2, a slide 3, a lower mold 4, a core frame 5, a core assembly 6 and a medium supply device 7, wherein the upper mold 2 is slidably arranged on the frame 1, the slide 3 is slidably arranged on the frame 1, the lower mold 4 is arranged on the slide 3, a forming cavity 8 is formed between the upper mold 2 and the lower mold 4, and the core frame 5 is movably arranged on the slide 3, The mold core assembly 6 includes two groups of separable mold cores 61, and the separable mold cores 61 are arranged on the mold core frame 5. After the mold core frame 5 moves, the two groups of separable mold cores 61 enter or exit the two ends of the molding cavity 8 respectively, so as to make the two groups of separable mold cores 61 cooperate to form a complete mold core, or release the cooperation and split the mold core. The separable mold core 61 has a through hole 9. After two groups of the separable mold cores 61 are matched to form a complete mold core, the through holes 9 on the two groups of the separable mold cores 61 are connected to form a medium conveying channel 10. The medium supply device 7 is arranged on the slide 3, and the two ends of the medium conveying channel 10 are respectively connected to the medium supply device 7 to make the medium conveying channel 10 form a circulation.

[0030] In this embodiment, during the U-shaped tube processing, the upper mold 2 is slidably mounted on the frame 1 by means of a hydraulic press, ensuring that the upper mold 2 can stably move up and down. The slide 3 is slidably mounted on the frame 1 in the horizontal direction, and the lower mold 4 is arranged on the slide 3. The position of the lower mold 4 can be conveniently adjusted by moving the slide 3, which is convenient for demoulding. The core frame 5 is also mounted on the slide 3 and can move on the slide 3.

[0031] The mold core assembly 6 is composed of two groups of separable mold cores 61, which are installed on the mold core frame 5. The separable mold core 61 is actually a complete mold core split into several sections, and the sections are movably connected. When injection molding is required, the mold core frame 5 is moved so that the two groups of separable mold cores 61 enter the two ends of the molding cavity 8 respectively. At this time, the two groups of separable mold cores 61 cooperate with each other to form a complete mold core, providing a stable internal support structure for injection molding. Then, the molten plastic raw material is injected into the molding cavity 8 between the upper mold 2 and the lower mold 4.

[0032] By designing a through hole 9 on the separable mold core 61, the through holes 9 on the separable mold core 61 can be connected after the separable mold core 61 is assembled, thereby forming a medium conveying channel 10. By connecting the two ends of the medium conveying channel 10 to the medium supply device 7, a circulating passage is formed, and auxiliary medium can be conveyed into the mold core, and the medium can be circulated and conveyed. For example, during the injection molding process, in order to ensure the fluidity of the raw material, a hot medium, such as high-temperature gas, can be conveyed into the through hole 9 of the separable mold core 61. The hot medium flows in the through hole 9, and the temperature of the mold core is increased through heat transfer, thereby improving the fluidity of the raw material, ensuring that the raw material can evenly fill the entire cavity, and avoiding insufficient filling and uneven local wall thickness. When the injection molding is completed, when the product needs to be cooled, it is switched to conveying a cold medium, such as a low-temperature gas. The cold medium forms a cycle in the through hole 9, quickly takes away the heat inside the product, and accelerates the cooling speed. Since the cold medium directly acts on the inside of the product, compared with the traditional external cooling method, it can effectively reduce the temperature difference between the inside and outside of the product, reduce stress concentration, and improve the dimensional accuracy and mechanical properties of the product. The switching between the hot medium and the cold medium can be achieved through the temperature control function of the medium supply device 7 or by replacing a different medium supply device 7 .

[0033] When the product is cooled, the mold core frame 5 is moved to allow the two groups of separable mold cores 61 to exit the molding cavity 8. During the exit process, the separable mold cores 61 are automatically separated to facilitate demoulding the formed U-shaped tube from the mold core.

[0034] This U-tube processing forming device has many significant beneficial effects. First, through the design of the separable core 61, a complete core can be formed during injection molding to ensure the normal progress of injection molding, and it can be automatically split during demolding, which is convenient and quick, greatly improving production efficiency. Secondly, a through hole 9 is set on the separable core 61 and connected to the medium supply device 7, which realizes the function of transporting hot medium during injection molding to ensure the fluidity of raw materials and transporting cold medium during cooling to accelerate the internal cooling of the product. This not only solves the problem that the raw materials are not easy to flow stably and fill the mold cavity evenly due to the large bending degree and complex structure of the U-tube, but also significantly shortens the cooling time and improves production efficiency. At the same time, the internal cooling method can effectively reduce the temperature difference between the inside and outside of the product, reduce stress concentration, improve the dimensional accuracy and mechanical properties of the U-tube, and meet the high quality requirements of modern industry for U-tubes.

[0035] Furthermore, there are multiple through holes 9, and the multiple through holes 9 are evenly distributed along the circumference of the separable mold core 61, and the cross section of the through holes 9 is arc-shaped. The core frame 5 has an inlet 11 and a return port 12, and both ends of the medium conveying channel 10 are connected to the inlet 11 and the return port 12 respectively. The inlet 11 and the return port 12 are connected to the medium supply device 7 by means of connecting pipes 13 respectively, so as to make the medium conveying channel 10 form a circulation.

[0036] In this embodiment, a plurality of through holes 9 are arranged on the separable mold core 61, and these through holes 9 are evenly distributed along the circumferential direction, and the cross-section of the through holes 9 is designed to be arc-shaped, which is more in line with the shape of the mold core. When two sets of separable mold cores 61 enter the two ends of the molding cavity 8 and cooperate to form a complete mold core, the plurality of through holes 9 with arc-shaped cross-sections are also interconnected to form a plurality of medium delivery channels 10.

[0037] The core frame 5 is provided with an inlet 11 and a return port 12. The two ends of the medium conveying channel 10 are connected to the inlet 11 and the return port 12 respectively. The inlet 11 and the return port 12 are connected to the medium supply device 7 through the connecting pipe 13. During the injection molding process, the medium supply device 7 conveys the hot medium (such as high-temperature gas) to the inlet 11 of the core frame 5 through the connecting pipe 13. The hot medium enters from the inlet 11 and then flows into multiple medium conveying channels 10 at the same time. Since the through holes 9 are evenly distributed along the circumferential direction and the cross-section is arc-shaped, the hot medium can fully contact the core, increase the heat exchange area, and quickly heat up the core. The hot medium flows in multiple medium conveying channels 10, and the core temperature is increased through heat transfer, thereby ensuring that the molten plastic raw material has good fluidity and can evenly fill the entire cavity.

[0038] When the injection molding is completed and cooling is required, the medium supply device 7 switches to conveying cold medium (such as low-temperature gas). The cold medium enters the multiple medium conveying channels 10 from the inlet 11 of the core frame 5, circulates in the channels, and quickly removes the heat inside the product. Due to the existence of multiple medium conveying channels 10, the heat exchange efficiency is higher and the cooling speed can be accelerated. The cold medium finally flows out from the return port 12 and returns to the medium supply device 7 through the connecting pipe 13 to form a cycle.

[0039] Furthermore, the separable mold core 61 includes a straight mold section 611 and a curved mold section 612. One end of the straight mold section 611 is arranged on the mold core frame 5, and the other end is movably connected to the curved mold section 612. Both the straight mold section 611 and the curved mold section 612 have the through hole 9. After the straight mold section 611 and the curved mold section 612 are matched, the through holes 9 of the straight mold section 611 and the curved mold section 612 are connected.

[0040] In this embodiment, the separable mold core 61 is composed of a straight mold section 611 and a curved mold section 612. One end of the straight mold section 611 is mounted on the mold core frame 5, and the other end is movably connected to the curved mold section 612. This design can better adapt to the special shape of the U-shaped tube.

[0041] The straight mold section 611 corresponds to the straight section of the product, and the curved mold section 612 corresponds to the curved section of the product. When performing the injection molding operation, the mold core frame 5 is moved so that the straight mold section 611 and the curved mold section 612 of the two sets of separable mold cores 61 enter the corresponding positions of the molding cavity 8 respectively. Through holes 9 are designed on the straight mold section 611 and the curved mold section 612. When the straight mold section 611 and the curved mold section 612 are matched, their respective through holes 9 can be smoothly connected.

[0042] Designing the separable mold core 61 into a straight mold section 611 and a curved mold section 612, and making them movable and connected, has many significant advantages. First of all, this design can better adapt to the shape characteristics of the U-shaped tube. The straight mold section 611 and the curved mold section 612 correspond to the straight section and the curved section of the product respectively, so that different parts can be processed more accurately during the injection molding and cooling process. The through holes 9 on the straight mold section 611 and the curved mold section 612 are connected after matching to form a complete medium conveying channel 10, ensuring that the hot medium and the cold medium can circulate in the entire mold core, and efficient heat exchange can be achieved in both the straight section and the curved section of the product. The design that can be movable connected makes demolding more convenient and quick, greatly improving production efficiency.

[0043] Furthermore, the bending mold section 612 includes a plurality of bending mold cores 6121 which can be flexibly connected end to end. One end of the straight mold section 611 is arranged on the mold core frame 5, and the other end can be flexibly connected to the bending mold core 6121 located at the end of the bending mold section 612. Both ends of the bending model core 6121 respectively have a clamping portion 14 and a clamping groove 15 for clamping with adjacent bending model cores 6121 respectively.

[0044] Furthermore, it also includes a connecting rod 16, and both ends of the connecting rod 16 are respectively rotatably and slidably arranged on two adjacent bending model cores 6121.

[0045] Furthermore, the bending model core 6121 has a slide groove 17 therein, and also includes a positioning pin 18, and the positioning pin 18 is arranged at the end of the connecting rod 16, and the two positioning pins 18 are respectively located in the slide grooves 17 of the two adjacent bending model cores 6121.

[0046] In this embodiment, a clamping portion 14 and a clamping groove 15 are respectively provided at both ends of the bending mold core 6121, and adjacent bending mold cores 6121 are clamped together through the clamping portion 14 and the clamping groove 15. This clamping method can ensure the matching accuracy after the combination of multiple bending mold cores 6121, so that the bending mold segment 612 can stably form the bending part of the U-shaped tube during the forming process.

[0047] Meanwhile, a connecting rod 16 is provided, and the positioning pins 18 at both ends of the connecting rod 16 are respectively rotated and slidably arranged in the slide grooves 17 of two adjacent bending mold cores 6121. In the process of inserting or withdrawing from the molding cavity 8, the positioning pins 18 can rotate in the corresponding slide grooves 17 to achieve the twisting between the bending mold cores 6121, and the positioning pins 18 can also slide in the corresponding slide grooves 17 to achieve the relative sliding between the bending mold cores 6121, thereby ensuring the completion of the combination or separation of the bending mold cores 6121.

[0048] A plurality of flexible bending mold cores 6121 form a bending mold section 612, which greatly improves the molding accuracy and adaptability of the bending portion of the U-shaped tube. Adjacent bending mold cores 6121 are connected by the clamping portion 14 and the clamping groove 15, which ensures the matching accuracy after the combination, making the shape of the bending portion of the U-shaped tube more accurate. This design improves the convenience of demoulding and greatly improves production efficiency.

[0049] Furthermore, it also includes a movable frame 19 and a core rod 20, the movable frame 19 is movably arranged on the slide 3, the core rod 20 is arranged on the movable frame 19, the bent mold core 6121, the straight mold section 611 and the mold core frame 5 have a through core hole 21, and the core rod 20 is located in the core hole 21.

[0050] Furthermore, it also includes a hook 1 22 and a hook 23, wherein the hook 1 22 is arranged on the core frame 5, and the hook 23 is swingably arranged on the movable frame 19, and the hook 23 is engaged with or unengaged from the hook 1 22 after swinging.

[0051] Furthermore, the slide 3 has a limiting surface 24, the second hook 23 abuts against the limiting surface 24 and slides on the limiting surface 24, the limiting surface 24 has a limiting groove 25 for accommodating the second hook 23, and a torsion spring 26 is provided at the hinge point of the second hook 23 for providing force for the second hook 23 to approach the limiting surface 24.

[0052] In this embodiment, the moving frame 19 is movably arranged on the slide 3, and the core rod 20 is installed on the moving frame 19. The bending mold core 6121, the straight mold section 611 and the mold core frame 5 have a through core hole 21, and the core rod 20 is located in the core hole 21. The end of the core rod 20 has a curved section corresponding to the curvature of the curved part of the product.

[0053] In the initial state, the second hook 23 is in a locked state with the first hook 22. When the injection molding operation is performed, the telescopic member installed on the slide 3 drives the core frame 5 to slide. Due to the locking of the first hook 22 and the second hook 23, the core frame 5 also drives the moving frame 19 to slide together while sliding, so that the separable core 61 and the core rod 20 are inserted into the molding cavity 8 synchronously.

[0054] As the insertion process proceeds, when the core rod 20 is inserted into place, the second hook 23 moves to the position of the limit groove 25 of the limit surface 24. Under the action of the torsion spring 26, the second hook 23 swings and enters the limit groove 25. At this time, the second hook 23 is released from the first hook 22, the moving frame 19 stops moving, and the core frame 5 continues to move with the curved mold core 6121 and the straight mold section 611. Under the guidance of the curved section at the end of the core rod 20, the curved mold core 6121 moves and twists, and finally multiple curved mold cores 6121 and straight mold sections 611 cooperate with each other to form a complete mold core.

[0055] When the demoulding operation is performed, the core frame 5 is retracted, and the hook 1 22 pushes the movable frame 19 backward, so that the hook 2 23 is disengaged from the limit groove 25 and re-engaged with the hook 1 22 under the extrusion of the limit surface 24. Finally, the core is withdrawn from the molding cavity 8, and the demoulding is completed.

[0056] The provided core rod 20 and the curved section at its end can provide accurate guidance for the movement and twisting of the bent mold core 6121 during the injection molding process, ensuring that the separable mold core 61 can be smoothly combined into a complete mold core, thereby improving the molding accuracy of the U-shaped tube. The coordination of the hook 1 22 and the hook 2 23 and the design of the limiting surface 24 and the limiting groove 25 realize the orderly movement of the separable mold core 61 and the core rod 20 when inserting into and withdrawing from the molding cavity 8, thereby ensuring the stability and reliability of the processing process. During the insertion process, the separable mold core 61 and the core rod 20 can be inserted synchronously, thereby improving the operating efficiency; during the withdrawal process, the hook 2 23 can be easily reconnected with the hook 1 22, thereby facilitating subsequent operations.

[0057] Furthermore, it also includes a trimming pressure plate 27 and a discharge ejector rod 28. The trimming pressure plate 27 is slidably arranged on the frame 1. The trimming pressure plate 27 has a clearance hole 29. The shape of the clearance hole 29 is consistent with the contour of the forming cavity 8 and is used for allowing the product to pass through. After sliding, the trimming pressure plate 27 is used to abut against the lower mold 4 and press the flash on the edge of the product. The inner wall of the forming cavity 8 has an ejection hole 30, and the discharge ejector rod 28 is slidably arranged in the ejection hole 30.

[0058] In this embodiment, during demoulding, the slide 3 drives the lower mold 4 to slide to a specific position below the trimming plate 27. Then, the trimming plate 27 begins to descend, and the shape of the clearance hole 29 on the trimming plate 27 matches the contour of the molding cavity 8. As the trimming plate 27 descends, the trimming plate 27 tightly abuts against the surface of the lower mold 4. At this time, if flash is generated at the mold closing position of the upper mold 2 and the lower mold 4 during the injection molding process, the flash will be pressed by the trimming plate 27.

[0059] Then, the ejector pin 28 located in the ejection hole 30 on the inner wall of the molding cavity 8 begins to rise upward. During the process of the ejector pin 28 rising, the product is ejected from the molding cavity 8 and the clearance hole 29. In this process, while the product is being ejected upward, the flash is pressed by the trimming pressing plate 27, so that the flash is separated from the product. In this way, the product is ejected from the mold and the flash is removed at the same time.

[0060] By providing the trimming plate 27 and the ejector pin 28, the flash on the edge of the product can be automatically removed during the demoulding process, thereby improving the quality and appearance of the product. No additional process is required to handle the flash, which saves time and labor costs and improves production efficiency. The design of the clearance hole 29 of the trimming plate 27 can ensure that the product passes smoothly during the demoulding process, while accurately pressing the flash to ensure the effect of removing the flash. The provision of the ejector pin 28 enables the product to be ejected from the molding cavity 8 quickly and stably, facilitating subsequent operation and processing.

[0061] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A U-shaped tube forming device, characterized in that: The invention comprises a frame (1), an upper mold (2), a slide (3), a lower mold (4), a core frame (5), a core assembly (6) and a medium supply device (7), wherein the upper mold (2) is slidably mounted on the frame (1), the slide (3) is slidably mounted on the frame (1), the lower mold (4) is mounted on the slide (3), a molding cavity (8) is formed between the upper mold (2) and the lower mold (4), and the core frame (5) is movably mounted on the slide (3). The mold core assembly (6) comprises two groups of separable mold cores (61), wherein the separable mold cores (61) are arranged on the mold core frame (5). After the mold core frame (5) moves, the two groups of separable mold cores (61) respectively enter or exit the two ends of the molding cavity (8), so as to make the two groups of separable mold cores (61) cooperate with each other to form a complete mold core, or release the cooperation and make the mold core split. The separable mold core (61) has a through hole (9). After two groups of the separable mold cores (61) are matched to form a complete mold core, the through holes (9) on the two groups of the separable mold cores (61) are connected to form a medium conveying channel (10). The medium supply device (7) is arranged on the slide (3). The two ends of the medium conveying channel (10) are respectively connected to the medium supply device (7) to enable the medium conveying channel (10) to form a circulation.

2. A U-shaped tube forming device according to claim 1, characterized in that: There are a plurality of through holes (9), and the plurality of through holes (9) are evenly distributed along the circumferential direction of the separable mold core (61). The cross section of the through holes (9) is arc-shaped. The core frame (5) has an inlet (11) and a return port (12), and the two ends of the medium conveying channel (10) are respectively connected to the inlet (11) and the return port (12), and the inlet (11) and the return port (12) are respectively connected to the medium supply device (7) by means of connecting pipes (13) to form a circulation of the medium conveying channel (10).

3. A U-shaped tube forming device according to claim 2, characterized in that: The separable mold core (61) comprises a straight mold section (611) and a curved mold section (612); one end of the straight mold section (611) is arranged on the mold core frame (5), and the other end is movably connected to the curved mold section (612); both the straight mold section (611) and the curved mold section (612) have the through hole (9); after the straight mold section (611) and the curved mold section (612) are matched, the through holes (9) of the straight mold section (611) and the curved mold section (612) are connected.

4. A U-shaped tube forming device according to claim 3, characterized in that: The bending die section (612) comprises a plurality of bending die cores (6121) which are movably connected end to end in sequence; one end of the straight die section (611) is arranged on the die core frame (5), and the other end is movably connected to the bending die core (6121) located at the end of the bending die section (612); and both ends of the bending die core (6121) are respectively provided with a clamping portion (14) and a clamping groove (15) for clamping with adjacent bending die cores (6121).

5. A U-shaped tube forming device according to claim 4, characterized in that: It also comprises a connecting rod (16), the two ends of which are respectively rotatably and slidably disposed on two adjacent bending mold cores (6121).

6. A U-shaped tube forming device according to claim 5, characterized in that: The bending model core (6121) has a slide groove (17) therein and also includes a positioning pin (18), wherein the positioning pin (18) is arranged at the end of the connecting rod (16), and the two positioning pins (18) are respectively located in the slide grooves (17) of two adjacent bending model cores (6121).

7. A U-shaped tube forming device according to claim 4, characterized in that: The mold core (6121), the straight mold section (611) and the mold core frame (5) are provided with a through core hole (21), and the core rod (20) is located in the core hole (21).

8. A U-shaped tube forming device according to claim 7, characterized in that: It also comprises a first hook (22) and a second hook (23), wherein the first hook (22) is arranged on the core frame (5), and the second hook (23) is swingably arranged on the movable frame (19), and the second hook (23) is engaged with or unengaged from the first hook (22) after swinging.

9. A U-shaped tube forming device according to claim 8, characterized in that: The slide table (3) is provided with a limiting surface (24), the second hook (23) abuts against the limiting surface (24) and slides on the limiting surface (24), the limiting surface (24) is provided with a limiting groove (25) for accommodating the second hook (23), and a torsion spring (26) is provided at a hinge point of the second hook (23) for providing a force for the second hook (23) to approach the limiting surface (24).

10. A U-shaped tube forming device according to claim 1, characterized in that: The invention also comprises a trimming pressing plate (27) and a discharge ejector rod (28). The trimming pressing plate (27) is slidably arranged on the frame (1). The trimming pressing plate (27) has a clearance hole (29). The shape of the clearance hole (29) matches the contour of the molding cavity (8) and is used for allowing the product to pass through. After sliding, the trimming pressing plate (27) is used to abut against the lower mold (4) and press the flash on the edge of the product. The inner wall of the molding cavity (8) has an ejection hole (30). The discharge ejector rod (28) is slidably arranged in the ejection hole (30).

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