Elbow machining die

Abstract

The utility model relates to the technical field of different-diameter bent pipe machining dies, and provides a bent pipe machining die which comprises an upper die, a lower die and an inner core, the upper die and the lower die are both provided with through cavities, after the upper die and the lower die are combined, two installation grooves are formed in the two ends of each cavity, and the two ends of the inner core are arranged in the two installation grooves respectively. A forming cavity is formed among the inner core, the upper die and the lower die, the inner core is divided into a plurality of sections, and the adjacent sections are detachably connected. By means of the technical scheme, the problem that in the reducing elbow machining field in the prior art, a used inner core is not prone to demolding is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of different diameter pipe bending processing dies, and in particular to a pipe bending processing die. Background Art

[0002] Reducing elbows are primarily used in situations where pipe diameters need to be changed, such as in piping systems in the chemical, petroleum, and pharmaceutical industries. By using reducing elbows, pipe diameters can be reduced or expanded to meet process flow requirements without changing the overall layout of the piping system.

[0003] Currently, reducing pipe bends can be manufactured using investment casting, a process in which the inner core plays a crucial role. However, the varying diameters of the pipes complicate the design and manufacture of the inner core, as the transition between different diameters requires the inner core to accurately adapt, which increases the difficulty of processing the inner core. The curved shape of the pipe further exacerbates the processing challenges of the inner core, as the inner core cannot meet the shape requirements of the bend. Furthermore, after processing, the inner core is difficult to remove from the mold, which not only affects production efficiency but also may damage the inner core, increasing production costs.

[0004] In summary, in the existing casting process of reducing-diameter pipe bending, the problem of the inner core being difficult to bend and difficult to demould has become a key factor restricting the processing of reducing-diameter pipe bending and needs to be solved urgently. Utility Model Content

[0005] The utility model provides a pipe bending processing die, which solves the problem in the related art that an inner core used in the different-diameter pipe bending processing field is difficult to be ejected from the die.

[0006] The technical solution of the present utility model is as follows: A pipe bending processing mold, comprising an upper mold, a lower mold and an inner core, the upper mold and the lower mold both having a through cavity, and after the upper mold and the lower mold are combined, two mounting grooves are formed at both ends of the cavity, the two ends of the inner core are respectively arranged in the two mounting grooves, and a molding cavity is formed between the inner core, the upper mold and the lower mold, and the inner core is divided into multiple sections, and adjacent sections are detachably connected.

[0007] Optionally, the inner core includes a first section, a second section, a third section and a fourth section, the first section is arranged in one of the installation grooves, and the third section and the fourth section are arranged in another of the installation grooves.

[0008] Optionally, the first section has an inserting portion 1, and the second section has a slot 1, the inserting portion 1 is used to be plugged into the slot 1, and both the inserting portion 1 and the slot 1 are in the shape of a quadrangular pyramid.

[0009] Optionally, the second section has a second plug-in portion, and the third section has a second slot. The second plug-in portion is used to be plugged into the second slot, and both the second plug-in portion and the second slot are triangular.

[0010] Optionally, the third section is provided with a pin hole 1 along its own radial direction, and the inserting portion 2 is provided with a positioning hole 1, and the pin hole 1 and the positioning hole 1 are used to jointly accommodate a positioning pin 1.

[0011] Optionally, the third section has a guide groove, the fourth section has a guide block, and the guide block is slidably disposed in the guide groove.

[0012] Optionally, the third section is provided with a second pin hole along the length direction, the second inserting portion is provided with a second positioning hole, and the second pin hole and the second positioning hole are used to jointly accommodate a second positioning pin.

[0013] Optionally, a pressing block is further included, which is detachably mounted on the upper mold. The pressing block has a pressing slope, and the end of the first section has a pressure-bearing slope, and the pressing slope is used to abut against the pressure-bearing slope.

[0014] Optionally, a positioning plate is further included, which is detachably mounted on the upper mold and the lower mold. The positioning plate has a positioning groove, which is used to accommodate the ends of the third section and the fourth section.

[0015] Optionally, both the upper mold and the lower mold have a pin hole three, and also include a positioning pin three, the two ends of the positioning pin three are respectively inserted into the pin holes three of the upper mold and the lower mold, for fixing the upper mold and the lower mold.

[0016] The working principle and beneficial effects of the utility model are as follows:

[0017] The pipe bending mold primarily consists of an upper mold, a lower mold, and an inner core. The upper and lower molds are designed to provide a continuous cavity that matches the desired shape of the desired reducing bend. When the upper and lower molds are combined, two mounting slots naturally form at either end of the cavity. Because the cavity is continuous, these slots are located on the surfaces of both the upper and lower molds. These slots provide a stable structure for mounting and securing the inner core, with each end of the inner core positioned within one of the two mounting slots. The inner core consists of multiple segments, each connected by a removable connection.

[0018] During the manufacturing process, the various sections of the inner core are first assembled into a single unit. The ends of the assembled inner core are then placed into the mounting grooves formed by the upper and lower molds. This creates a cavity for the reducing elbow between the inner core, upper, and lower molds. The desired reducing elbow is then produced using traditional investment casting techniques.

[0019] When demolding is required, since the inner core is segmented and adjacent segments are detachably connected, each segment of the inner core can be disassembled in turn. First, the connection at one end is loosened, a segment of the inner core is taken out, and then the segmented inner core is disassembled one by one until all the inner cores are taken out. This operation method is very convenient and avoids the problem that traditional inner cores are difficult to demold due to different diameters and bending.

[0020] The present pipe bending mold offers numerous significant benefits. First, the segmented design of the inner core makes it easier to bend, better adapting to the shape requirements of reducing pipe bends. This design significantly improves the applicability of the inner core, particularly for reducing pipe bends with complex curvatures. Second, during the demolding process, the detachably connected inner cores can be removed sequentially, making the process quick and easy and reducing the difficulty of demolding. Furthermore, the smoother demolding process reduces the risk of damage to the inner core, thereby reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The preferred embodiments 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.

[0022] Figure 1 The figure is a schematic diagram of the appearance of a pipe bending die;

[0023] Figure 2 This is a structural diagram showing the inner core being installed on the lower die;

[0024] Figure 3 Schematic diagram of the structure of the lower mold;

[0025] Figure 4 This is a schematic structural diagram of the inner core of the present invention at one angle;

[0026] Figure 5 This is a structural diagram of the inner core of the present invention from another angle;

[0027] Figure 6 This is a schematic diagram of the explosion structure of the inner core of the present invention at one angle;

[0028] Figure 7 This is a schematic diagram of the explosion structure of the inner core in the present invention from another angle.

[0029] In the figure: 1. upper die, 2. lower die, 3. inner core, 4. cavity, 5. mounting groove, 6. molding cavity, 31. first section, 32. second section, 33. third section, 34. fourth section, 7. inserting part one, 8. slot one, 9. inserting part two, 10. slot two, 11. pin hole one, 12. positioning hole one, 13. positioning pin one, 14. guide groove, 15. guide block, 16. pin hole two, 17. positioning hole two, 18. positioning pin two, 19. pressing block, 20. pressing slope, 21. pressure-bearing slope, 22. positioning plate, 23. positioning groove, 24. pin hole three, 25. positioning pin three. DETAILED DESCRIPTION

[0030] 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 drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without inventive work.

[0031] To simplify the drawings, only the parts relevant to the utility model are schematically shown in each figure; they do not represent the actual structure of the product. Furthermore, to simplify the drawings and facilitate understanding, in some figures, only one of the components with the same structure or function is schematically shown or labeled. In this document, "one" not only means "only one" but also "more than one," and "several" includes "two" and "more than two."

[0032] It should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0033] 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.

[0034] Reference Figures 1 to 7, which is the first embodiment of the utility model, proposes a pipe bending processing mold, including an upper mold 1, a lower mold 2 and an inner core 3, the upper mold 1 and the lower mold 2 both have a through cavity 4, after the upper mold 1 and the lower mold 2 are combined, two mounting grooves 5 are formed at both ends of the cavity 4, the two ends of the inner core 3 are respectively arranged in the two mounting grooves 5, and a molding cavity 6 is formed between the inner core 3, the upper mold 1 and the lower mold 2, the inner core 3 is divided into multiple sections, and adjacent sections are detachably connected.

[0035] In this embodiment, the pipe bending processing mold is mainly composed of an upper mold 1, a lower mold 2 and an inner core 3. The shape design of the upper mold 1 and the lower mold 2 ensures that they have a through cavity 4, and the cavity 4 matches the shape of the different-diameter elbow to be processed. When the upper mold 1 and the lower mold 2 are combined together, two mounting grooves 5 are naturally formed at both ends of the cavity 4. Because the cavity 4 is through, the mounting grooves 5 are located on the surfaces of the upper mold 1 and the lower mold 2. The mounting grooves 5 provide a stable structure for the installation and fixation of the inner core 3, and the two ends of the inner core 3 are respectively arranged in the two mounting grooves 5. The inner core 3 is composed of multiple sections, and each section is connected by a detachable connection.

[0036] During the manufacturing process, the various segments of the inner core 3 are first assembled into a single unit. The ends of the assembled inner core 3 are then placed in mounting grooves 5 formed by the combination of the upper and lower molds 1 and 2. This creates a molding cavity 6 for forming the reducing elbow between the inner core 3, the upper and lower molds 1, and 2. The desired reducing elbow is then produced using conventional investment casting techniques.

[0037] When demolding is required, since the inner core 3 is segmented and adjacent segments are detachably connected, each segment of the inner core 3 can be disassembled in turn. First, the connection at one end is loosened, a segment of the inner core 3 is taken out, and then the segmented operation is performed one by one until all the inner cores 3 are taken out. This operation method is very convenient and avoids the problem that the traditional inner core 3 is difficult to demold due to different diameters and bending.

[0038] The present pipe bending mold has numerous significant benefits. First, the segmented design of the inner core 3 makes it easier to bend, better adapting to the shape requirements of reducing bends. This design significantly improves the applicability of the inner core 3, especially for reducing bends with complex curvatures. Second, during the demolding process, the detachably connected inner core 3 can be removed sequentially, making the operation convenient and quick, reducing the difficulty of demolding. Furthermore, since the demolding process is smoother, the risk of damage to the inner core 3 is also reduced, thereby reducing production costs.

[0039] Furthermore, the inner core 3 includes a first section 31 , a second section 32 , a third section 33 and a fourth section 34 , the first section 31 is arranged in one of the mounting grooves 5 , and the third section 33 and the fourth section 34 are arranged in another of the mounting grooves 5 .

[0040] In this embodiment, the inner core 3 includes a first section 31, a second section 32, a third section 33, and a fourth section 34. When assembling the mold, one end of the first section 31 is placed in one of the mounting grooves 5 to ensure its accurate and stable position. The remaining sections are then connected in sequence, and one end of the third section 33 and the fourth section 34 are placed together in another mounting groove 5. Through this arrangement, the four-segment inner core 3 is effectively supported and stably placed in the mold cavity 4 formed by the upper mold 1 and the lower mold 2. The segments fit tightly together to form a complete inner core 3 structure, providing accurate shape support for the molding of the reducer elbow.

[0041] Furthermore, the first section 31 has an inserting portion 7, and the second section 32 has a slot 8. The inserting portion 7 is used to be plugged into the slot 8, and both the inserting portion 7 and the slot 8 are in the shape of a quadrangular pyramid.

[0042] In this embodiment, the end of the first section 31 is provided with an insert 7, which is a quadrangular pyramid. Simultaneously, the corresponding end of the second section 32 is provided with a slot 8, also in the shape of a quadrangular pyramid. When the first section 31 and the second section 32 need to be connected, the insert 7 of the first section 31 is aligned with the slot 8 of the second section 32, allowing the insert 7 to gradually insert into the slot 8. Because both the insert 7 and the slot 8 are quadrangular pyramids, this shape provides excellent guidance during the connection process, allowing the insert 7 to accurately insert into the slot 8, achieving rapid alignment and connection between the first section 31 and the second section 32, ensuring the connection precision of the two sections of the inner core 3 and thus the overall shape accuracy of the inner core 3. The entire connection process is simple and convenient, requiring no complex tools or procedures, greatly improving production efficiency.

[0043] Furthermore, the second section 32 has a second inserting portion 9, and the third section 33 has a second slot 10. The second inserting portion 9 is used to be plugged into the second slot 10, and both the second inserting portion 9 and the second slot 10 are triangular.

[0044] In this embodiment, different connection structures are provided at both ends of the second section 32, respectively, to achieve effective connection with the first section 31 and the third section 33. One end of the second section 32 is provided with a slot 1 8 for plugging and connecting with the insert 1 7 of the first section 31. At the other end of the second section 32, a second insert 9 is designed, and a second slot 10 is provided at a corresponding position of the third section 33. When connecting the second section 32 and the third section 33, the second insert 9 of the second section 32 is aligned with the second slot 10 of the third section 33, and then the second section 32 is pushed so that the second insert 9 is inserted into the second slot 10. Both the second insert 9 and the second slot 10 are triangular in design, which can better ensure the positional accuracy between the two during the plugging process. The triangular shape has a certain degree of stability and guidance. During the insertion of the second insert 9 into the second slot 10, the second insert 9 can automatically adjust its position, ensuring the connection accuracy of the two sections of the inner core 3, thereby ensuring the overall shape accuracy of the inner core 3.

[0045] Furthermore, the third section 33 is provided with a pin hole 11 along its radial direction, and the second inserting portion 9 is provided with a positioning hole 12. The pin hole 11 and the positioning hole 12 are used to jointly accommodate a positioning pin 13.

[0046] In this embodiment, after the insert portion 2 9 of the second section 32 is inserted into the slot 2 10 of the third section 33, to further ensure the stability and accuracy of the connection between the second section 32 and the third section 33, a pin hole 11 is provided along the radial direction of the third section 33, and a positioning hole 12 is provided at a corresponding position on the insert portion 2 9. The positioning pin 13 can be inserted into the pin hole 11 and the positioning hole 12, effectively positioning the second section 32 and the third section 33 in the axial direction. Inserting the positioning pin 13 is simple and convenient, allowing for rapid securing of the two sections of the inner core 3. After the positioning pin 13 is inserted, the connection between the second section 32 and the third section 33 becomes more secure, and the stable connection ensures that the inner core 3 will not deform or shift.

[0047] Furthermore, the third section 33 has a guide groove 14 , and the fourth section 34 has a guide block 15 . The guide block 15 is slidably disposed in the guide groove 14 .

[0048] In this embodiment, a guide groove 14 is provided on the third section 33, and a guide block 15 is correspondingly provided on the fourth section 34. When the inner core 3 is assembled, the guide block 15 on the fourth section 34 is slid into the guide groove 14 of the third section 33 along the axial direction of the inner core 3 to realize the sliding connection between the third section 33 and the fourth section 34. During the processing of the different-diameter elbow, this connection method can ensure that the third section 33 and the fourth section 34 are stably combined together, and together provide accurate shape support for the forming of the elbow.

[0049] When the processing is complete and the mold needs to be removed, the fourth section 34 is first removed by sliding along the guide groove 14. Since the fourth section 34 is slidably connected to the third section 33, the removal process is relatively easy and quick. After the fourth section 34 is removed, space is made for further removal of the third section 33, making it more convenient to remove the fourth section 34. This method of removing the fourth section 34 first and then the third section 33 greatly optimizes the removal process of the inner core 3, making the demolding process more orderly and efficient.

[0050] Furthermore, the third section 33 is provided with a second pin hole 16 along the length direction, and the second inserting portion 9 is provided with a second positioning hole 17 . The second pin hole 16 and the second positioning hole 17 are used to jointly accommodate a second positioning pin 18 .

[0051] In this embodiment, the second section 32 and the third section 33 are the corner parts of the inner core 3. Therefore, after the connection between the second section 32 and the third section 33 is completed, additional positioning operations are required to further enhance the connection strength between the two and ensure the stability of the corner parts of the inner core 3.

[0052] A second pin hole 16 is provided along the length of the third section 33, and a second positioning hole 17 is provided at a corresponding position on the second inserting portion 9. A second positioning pin 18 is inserted into the second pin hole 16 and then further penetrated until it is inserted into the second positioning hole 17 on the second inserting portion 9. The second positioning pin 18 is located in both the second pin hole 16 and the second positioning hole 17 and is arranged along the length of the third section 33. This design makes the connection between the second section 32 and the third section 33 more secure at the corner, allowing it to withstand greater external forces.

[0053] Furthermore, it includes a pressing block 19 , which is detachably mounted on the upper mold 1 . The pressing block 19 has a pressing slope 20 . The end of the first section 31 has a pressure-bearing slope 21 . The pressing slope 20 is used to abut against the pressure-bearing slope 21 .

[0054] In this embodiment, to ensure the overall stability of the inner core 3, further securing measures are taken for the first segment 31 at the end of the inner core 3. A pressure-bearing slope 21 is designed at the end of the first segment 31, and a pressure block 19 is also provided. The pressure block 19 is removably mounted on the upper mold 1 and has a pressing slope 20. During installation, the pressure block 19 is mounted at a specific position on the upper mold 1 so that the pressing slope 20 on the pressure block 19 closely abuts the pressure-bearing slope 21 at the end of the first segment 31. In this way, stable positioning of the first segment 31 is provided.

[0055] The interaction between the pressing bevel 20 of the pressing block 19 and the pressure-bearing bevel 21 of the first section 31 effectively prevents the first section 31 from moving or shaking, thereby ensuring the overall stability of the inner core 3. During the processing of reducing pipe bends, the stable inner core 3 can ensure the shape and dimensional accuracy of the bend, improving product quality. The detachable design of the pressing block 19 makes the installation and removal process more convenient and quick, facilitating the maintenance and upkeep of the mold. This fixing method is simple, effective, and low-cost, and can improve the performance and reliability of the mold without increasing excessive costs.

[0056] Furthermore, it also includes a positioning plate 22, which is detachably mounted on the upper mold 1 and the lower mold 2. The positioning plate 22 has a positioning groove 23, and the end of the fourth section 34 is detachably mounted in the positioning groove 23.

[0057] In this embodiment, the positioning plate 22 is detachably mounted on both the upper mold 1 and the lower mold 2, ensuring ease and stability of installation. A positioning groove 23 is provided on the positioning plate 22. When the inner core 3 is assembled, the end of the fourth section 34 is placed in the positioning groove 23 and bolted, so that the fourth section 34 is combined with the positioning plate 22. In the process of sliding the guide block 15 on the fourth section 34 into the guide groove 14 of the third section 33, the positioning plate 22 provides a clear sliding depth limit for the fourth section 34. When the positioning plate 22 slides to abut the mold surface, it indicates that the fourth section 34 is inserted into place, ensuring the accuracy of the connection between the sections of the inner core 3.

[0058] When the fourth section 34 needs to be removed for demolding, the operation is very simple: simply pull out the positioning plate 22. Since the end of the fourth section 34 is located in the positioning groove 23, the positioning plate 22 can pull the fourth section 34 out synchronously. This design greatly improves the efficiency of demolding and reduces the complexity of the operation. Furthermore, the positioning plate 22 is detachably connected to both the upper mold 1 and the lower mold 2, not only ensuring the positioning of the fourth section 34, but also further ensuring the tightness of the upper mold 1 and the lower mold 2.

[0059] Furthermore, the upper mold 1 and the lower mold 2 both have a pin hole three 24 and also include a positioning pin three 25. The two ends of the positioning pin three 25 are respectively inserted into the pin holes three 24 of the upper mold 1 and the lower mold 2 to fix the upper mold 1 and the lower mold 2.

[0060] In this embodiment, to ensure accurate positioning between upper mold 1 and lower mold 2, three locating pins 25 are used for positioning and securing. Pin holes 24 are provided on both upper mold 1 and lower mold 2. During mold assembly, the ends of three locating pins 25 are inserted into pin holes 24 on upper mold 1 and lower mold 2, respectively. The dimensions of three locating pins 25 precisely match those of three pin holes 24, allowing upper mold 1 and lower mold 2 to fit tightly together.

[0061] During the machining process, positioning pin 3 25 effectively prevents relative displacement between upper die 1 and lower die 2. Regardless of the pressure of the molten material or other external forces, upper die 1 and lower die 2 always maintain their precise relative position, thus ensuring the integrity and stability of cavity 4. This is crucial to the quality of the reducing elbow molding process.

[0062] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. 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, and all of these should be included in the scope of the claims of the present invention.

Claims

1. A pipe bending die, characterized in that: The invention comprises an upper mold (1), a lower mold (2) and an inner core (3), wherein the upper mold (1) and the lower mold (2) both have a through-molding cavity (4), and after the upper mold (1) and the lower mold (2) are combined, two mounting grooves (5) are formed at both ends of the molding cavity (4), and the two ends of the inner core (3) are respectively arranged in the two mounting grooves (5), and a molding cavity (6) is formed between the inner core (3), the upper mold (1) and the lower mold (2), and the inner core (3) is divided into multiple sections, and adjacent sections are detachably connected.

2. A pipe bending die according to claim 1, characterized in that: The inner core (3) comprises a first section (31), a second section (32), a third section (33) and a fourth section (34); the first section (31) is arranged in one of the mounting grooves (5), and the third section (33) and the fourth section (34) are arranged in another of the mounting grooves (5).

3. A pipe bending die according to claim 2, characterized in that: The first section (31) has an inserting portion 1 (7), and the second section (32) has a slot 1 (8). The inserting portion 1 (7) is used to be plugged into the slot 1 (8), and both the inserting portion 1 (7) and the slot 1 (8) are in the shape of a quadrangular pyramid.

4. A pipe bending die according to claim 3, characterized in that: The second section (32) has a second inserting portion (9), and the third section (33) has a second slot (10). The second inserting portion (9) is used to be plugged into the second slot (10), and both the second inserting portion (9) and the second slot (10) are triangular.

5. A pipe bending die according to claim 4, characterized in that: The third section (33) is provided with a pin hole (11) along its radial direction, and the second inserting portion (9) is provided with a positioning hole (12). The pin hole (11) and the positioning hole (12) are used to jointly accommodate a positioning pin (13).

6. A pipe bending die according to claim 4, characterized in that: The third section (33) is provided with a guide groove (14), and the fourth section (34) is provided with a guide block (15), and the guide block (15) is slidably arranged in the guide groove (14).

7. The pipe bending die according to claim 6, characterized in that: The third section (33) is provided with a second pin hole (16) along the length direction, and the second inserting portion (9) is provided with a second positioning hole (17). The second pin hole (16) and the second positioning hole (17) are used to jointly accommodate a second positioning pin (18).

8. The pipe bending die according to claim 2, characterized in that: It also includes a pressing block (19), which is detachably mounted on the upper mold (1), and has a pressing slope (20). The end of the first section (31) has a pressure-bearing slope (21), and the pressing slope (20) is used to abut against the pressure-bearing slope (21).

9. The pipe bending die according to claim 2, characterized in that: The present invention also includes a positioning plate (22), which is detachably mounted on the upper mold (1) and the lower mold (2), and has a positioning groove (23) on the positioning plate (22), and the positioning groove (23) is used to accommodate the end portions of the third section (33) and the fourth section (34).

10. The pipe bending die according to claim 1, characterized in that: The upper mold (1) and the lower mold (2) both have a pin hole three (24), and also include a positioning pin three (25), the two ends of the positioning pin three (25) are respectively inserted into the pin holes three (24) of the upper mold (1) and the lower mold (2), for fixing the upper mold (1) and the lower mold (2).

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