Forming die

Abstract

The utility model belongs to the technical field of pipe fitting forming, and particularly relates to a forming die which comprises a male die and a female die, a forming structure is arranged on a combined die of the male die and the female die, and the forming structure comprises a first cavity located in the male die and a second cavity located in the female die. A forming cavity is defined by the first cavity and the second cavity and used for containing a to-be-formed pipe fitting; the forming structure further comprises a first matching part, a first parting surface, a second matching part and a second parting surface, the first matching part and the first parting surface are located on the two sides of the first cavity, the first matching part comprises a first binding surface and a first receding surface, the first binding surface abuts against the first parting surface, and the first receding surface and the first parting surface are arranged in a spaced mode. The second matching part comprises a second binding face and a second avoiding face, the second binding face abuts against the second parting face, and the second avoiding face and the second parting face are arranged in a spaced mode. Through the design, the contact area of the surfaces on the two sides of the forming structure is reduced, the requirement for the machining precision of the parting surface is lowered, and therefore the manufacturing cost of the mold is lowered.

Description

Technical Field

[0001] The utility model relates to the technical field of pipe fitting forming, in particular to a forming die. Background Art

[0002] The existing hydraulic forming die cavities are generally designed as single cavities, and one cavity corresponds to one water injection and pressure boosting head and one sealing and pressure maintaining head. Therefore, generally only one pipe fitting is produced by one set of dies, resulting in low production efficiency and inability to meet the requirements of mass production.

[0003] In order to solve the above problems, a device with multiple die cavities for simultaneously forming multiple pipe fittings is provided in the current prior art, and the die is closed by the cooperation of the parting surface of the upper die and the parting surface of the lower die. However, there are requirements for the flatness of the plane in the plane cooperation. If the flatness is insufficient, it will lead to poor die closing. Therefore, the parting surface needs to be finely processed to meet the die closing requirements, and the increase in processing cost will also increase the manufacturing cost of the die. When a die has multiple die cavities at the same time, it means that the number of corresponding parting surfaces also increases, and the number of planes that need to be finely processed increases. When the die closing is through plane cooperation, the processing cost will increase accordingly. When the die cavity is arranged at an angle to the horizontal plane, the parting surfaces on both sides of the die cavity are arranged in a stepped manner. When the die closing is through plane cooperation, there are not only flatness problems but also parallelism problems between the two parting surfaces. At this time, the requirements for the fine processing of the parting surface are higher, which will lead to a higher manufacturing cost of the die. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a forming die, which reduces the contact area between the parting surfaces, thereby reducing the requirements for processing accuracy and thus reducing the manufacturing cost of the die.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] The utility model provides a forming die, including a male die and a female die. The male die and the female die are provided with a forming structure, and the forming structure includes:

[0007] A first cavity located in the male die and a second cavity located in the female die. The first cavity and the second cavity can enclose a forming chamber, and both ends of the forming chamber communicate with the outside. The forming chamber is used for placing the pipe fitting to be formed;

[0008] The first mating part and the second mating part located on both sides of the first cavity, and the first parting surface and the second parting surface located on both sides of the second cavity. The first mating part includes a first fitting surface and a first avoiding surface. The first fitting surface is connected to the first avoiding surface. The first fitting surface is used to abut against the first parting surface and is closer to the first cavity relative to the first avoiding surface. The first avoiding surface is spaced from the first parting surface. The second mating part includes a second fitting surface and a second avoiding surface. The second fitting surface is connected to the second avoiding surface. The second fitting surface is used to abut against the second parting surface and is closer to the second cavity relative to the second avoiding surface. The second avoiding surface is spaced from the second parting surface.

[0009] Further, when the male mold and the female mold are clamped, one end of the first avoiding surface connected to the first fitting surface is flush with the first parting surface, and the first avoiding surface gradually moves away from the first parting surface from the end connected to the first fitting surface to the other end. One end of the second avoiding surface connected to the second fitting surface is flush with the second parting surface, and the second avoiding surface gradually moves away from the second parting surface from the end connected to the second fitting surface to the other end.

[0010] Further, there are multiple forming structures, and the multiple forming structures are arranged at intervals along a set direction in the forming mold.

[0011] Further, the cross-section of the forming cavity is elliptical and the cross-sectional areas of the first cavity and the second cavity are equal. The first parting surface is located at one end of the ellipse along the long axis direction.

[0012] Further, the first parting surfaces in the multiple forming structures are flush and all parallel to a horizontal plane, and the second parting surfaces in the multiple forming structures are flush and all parallel to another horizontal plane.

[0013] Further, any two adjacent forming structures along the set direction are arranged side by side and are arranged at an angle to the vertical direction.

[0014] Further, the male mold is provided with a first connecting surface. One end of the first connecting surface is connected to the first avoiding surface of one of the two adjacent and side-by-side arranged forming structures, and the other end is connected to the second avoiding surface of the other of the two forming structures;

[0015] The female mold is provided with a second connecting surface. One end of the second connecting surface is connected to the first parting surface of one of the two adjacent and side-by-side arranged forming structures, and the other end is connected to the second parting surface of the other of the two forming structures. The first connecting surface and the second connecting surface are spaced apart.

[0016] Furthermore, the molding die further includes a first plug and a second plug. The first plug includes a first substrate and a plurality of water injection heads disposed on the first substrate. The plurality of water injection heads are arranged in one-to-one correspondence with the plurality of molding structures, and the water injection heads are used to block one end of the to-be-molded pipe fitting and inject water into the to-be-molded pipe fitting. The second plug includes a second substrate and a plurality of sealing heads disposed on the second substrate. The plurality of sealing heads are arranged in one-to-one correspondence with the plurality of molding structures, and the sealing heads are used to block the other end of the to-be-molded pipe fitting.

[0017] Furthermore, the male mold has two first inclined surfaces which are oppositely arranged, and one ends of the two first inclined surfaces are respectively connected to the first avoidance surface or the second avoidance surface of the adjacent molding structure. The female mold has two second inclined surfaces which are oppositely arranged, and one ends of the two second inclined surfaces are respectively connected to the first mold parting surface or the second mold parting surface of the adjacent molding structure. The two first inclined surfaces and the two second inclined surfaces are in one-to-one correspondence and are attached to each other, and the attachment angle forms an included angle with the vertical direction.

[0018] Furthermore, a first chamfer is provided at the connection between the second inclined surface and the first mold parting surface.

[0019] One molding die of the present utility model has at least the following beneficial effects:

[0020] One molding die of the present utility model includes a male mold and a female mold. Among them, the male mold and the female mold are provided with molding structures. The molding structure includes a first cavity located in the male mold and a second cavity located in the female mold. The first cavity and the second cavity can enclose a molding chamber, and both ends of the molding chamber communicate with the outside. The molding chamber is used to place the to-be-molded pipe fitting; a first fitting portion and a second fitting portion located on both sides of the first cavity, and a first mold parting surface and a second mold parting surface located on both sides of the second cavity. The first fitting portion includes a first fitting surface and a first avoidance surface. The first fitting surface is connected to the first avoidance surface. The first fitting surface is used to abut against the first mold parting surface and is closer to the first cavity relative to the first avoidance surface. The first avoidance surface is spaced from the first mold parting surface. The second fitting portion includes a second fitting surface and a second avoidance surface. The second fitting surface is connected to the second avoidance surface. The second fitting surface is used to abut against the second mold parting surface and is closer to the second cavity relative to the second avoidance surface. The second avoidance surface is spaced from the second mold parting surface. Through this design, the contact area of the surfaces on both sides of the molding structure is reduced, thereby reducing the requirement for the machining accuracy of the mold parting surface, and thus reducing the manufacturing cost of the mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is an exploded view of the structure of the molding die in the embodiment of the present utility model;

[0022] Figure 2 is a side view of the structure of the molding die in the embodiment of the present utility model;

[0023] Figure 3 is Figure 2 a partially enlarged view at position A in

[0024] Figure 4 is Figure 2 a partially enlarged view at position B in

[0025] Figure 5 is a schematic structural view of the male mold in the embodiment of the present utility model;

[0026] Figure 6 is Figure 5 a partially enlarged view at position D in

[0027] Figure 7 is a schematic structural view of the female mold in the embodiment of the present utility model;

[0028] Figure 8 is Figure 7 a partially enlarged view at position E in

[0029] Figure 9 is a schematic structural view of the first plug in the embodiment of the present utility model;

[0030] Figure 10 is a schematic structural view of the second plug in the embodiment of the present utility model;

[0031] Figure 11 is Figure 2 a partially enlarged view at position C in

[0032] In the figure:

[0033] 1. Male mold; 11. First cavity; 12. First connection surface; 13. First inclined surface; 2. Female mold; 21. Second cavity; 22. Second connection surface; 23. Second inclined surface; 3. Molding structure; 31. Molding chamber; 32. First mating part; 321. First fitting surface; 322. First avoidance surface; 33. Second mating part; 331. Second fitting surface; 332. Second avoidance surface; 34. First parting surface; 35. Second parting surface; 4. First plug; 41. First substrate; 411. Water inlet; 412. Water distribution channel; 42. Water injection head; 421. Water injection port; 422. Water injection channel; 5. Second plug; 51. Second substrate; 52. Sealing head; 6. First notch; 7. Second notch. Detailed implementation manners

[0034] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only for explaining the present utility model, rather than limiting the present utility model. Additionally, it should be noted that for the sake of description, only the parts related to the present utility model rather than all the structures are shown in the drawings.

[0035] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0036] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "over", and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath", and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the horizontal height of the first feature is lower than that of the second feature.

[0037] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meanings.

[0038] Currently, molds generally perform mold closing through the planar fit of the parting surfaces of the male mold and the female mold. However, there are problems with the planar flatness of the planar fit. If the flatness is insufficient, it will lead to poor mold closing. Therefore, it is necessary to perform a certain amount of finishing on the parting surface to process the parting surface to meet the mold closing requirements. However, the finishing will increase the manufacturing cost of the mold. When the number of mold cavities in a mold increases, the requirement for planar flatness is higher. When the parting surfaces are arranged in a stepped manner, not only the problem of planar flatness needs to be considered, but also the problem of parallelism needs to be considered. At this time, higher requirements for finishing the parting surface are needed during the manufacture of the mold, thereby increasing the manufacturing cost of the mold.

[0039] In this regard, a molding die is provided in this embodiment to solve the above problems. By reducing the contact area of the parting surface between the male die and the female die, the requirement for machining accuracy is reduced, thereby reducing the manufacturing cost of the die. The pipe fittings formed by this die include, but are not limited to, lower fork pipes, riser pipes, lower pipes, etc.

[0040] Please refer to Figures 1 to 9 As shown, the molding die includes a male die 1 and a female die 2, and a molding structure 3 is provided on the male die 1 and the female die 2. Among them, the molding structure 3 includes a first cavity 11 located on the male die 1 and a second cavity 21 located on the female die 2. The first cavity 11 and the second cavity 21 can enclose a molding chamber 31, and both ends of the molding chamber 31 communicate with the outside. The molding chamber 31 is used to place the pipe fittings to be molded; a first mating portion 32 and a second mating portion 33 are located on both sides of the first cavity 11, and a first parting surface 34 and a second parting surface 35 are located on both sides of the second cavity 21. The first mating portion 32 includes a first fitting surface 321 and a first avoiding surface 322. The first fitting surface 321 is connected to the first avoiding surface 322. The first fitting surface 321 is used to abut against the first parting surface 34 and is closer to the first cavity 11 relative to the first avoiding surface 322. The first avoiding surface 322 is spaced from the first parting surface 34. The second mating portion 33 includes a second fitting surface 331 and a second avoiding surface 332. The second fitting surface 331 is connected to the second avoiding surface 332. The second fitting surface 331 is used to abut against the second parting surface 35 and is closer to the second cavity 21 relative to the second avoiding surface 332. The second avoiding surface 332 is spaced from the second parting surface 35.

[0041] Specifically, in this embodiment, the surfaces on both sides of the first cavity 11 are set as the first mating part 32 and the second mating part 33, and the surfaces on both sides of the second cavity 21 are set as the first parting surface 34 and the second parting surface 35. The first mating part 32 mates with the first parting surface 34, and the second mating part 33 mates with the second parting surface 35. When the male mold 1 and the female mold 2 are clamped, the first mating surface 321 in the first mating part 32 is in contact with the first parting surface 34, and the second mating surface 331 in the second mating part 33 mates with the second parting surface 35. In this way, the outer wall of the molding cavity 31 can be sealed to prevent the appearance of a mold clamping line. When clamping the mold, the first avoidance surface 322 in the first mating part 32 does not contact the first parting surface 34, and the second avoidance surface 332 in the second mating part 33 also does not contact the second parting surface 35. In this way, for the surfaces on both sides of the first cavity 11 and the surfaces on both sides of the second cavity 21, only the contact area between the first mating surface 321 and the first parting surface 34 and the contact area between the second mating surface 331 and the second parting surface 35 need to be considered. That is, only these two contact surfaces need to be finely processed during machining. Therefore, the contact area between the first mating part 32 and the first parting surface 34 is reduced, and the contact area between the second mating part 33 and the second parting surface 35 is reduced. Furthermore, the precision requirement for machining is lowered, thereby reducing the manufacturing cost of the mold.

[0042] Further, as Figure 2 and Figure 3As shown, when the male mold 1 and the female mold 2 are closed, one end of the first avoidance plane 322 connected to the first fitting plane 321 is flush with the first parting plane 34, and the first avoidance plane 322 gradually moves away from the first parting plane 34 from the end connected to the first fitting plane 321 to the other end. One end of the second avoidance plane 332 connected to the second fitting plane 331 is flush with the second parting plane 35, and the second avoidance plane 332 gradually moves away from the second parting plane 35 from the end connected to the second fitting plane 331 to the other end. Specifically, in this embodiment, the first avoidance plane 322 and the second avoidance plane 332 are designed as inclined planes, and the inclined planes form an angle with the first parting plane 34 or the second parting plane 35, so that the first avoidance plane 322 only contacts the first parting plane 34 at one end, and the second avoidance plane 332 only contacts the second parting plane 35 at one end. Such a setting can reduce the contact area between the first fitting portion 32 and the first parting plane 34, and the contact area between the second fitting portion 33 and the second parting plane 35, and is convenient for processing the first fitting portion 32 and the second fitting portion 33, reducing the processing cost. In this embodiment, the angle is about 0.3 degrees. After machining the male mold 1 at this angle, there will be no excessive gap between the male mold 1 and the female mold 2 during mold closing, which will affect the mold closing and molding processes. In other embodiments, the first avoidance plane 322 and the first fitting plane 321 are connected in a stepped manner. In this way, the first avoidance plane 322 and the first parting plane 34 are arranged at intervals, so as to reduce the contact area between the first fitting portion 32 and the first parting plane 34; the second avoidance plane 332 and the second fitting plane 331 are also connected in a stepped manner. In this way, the second avoidance plane 332 and the second parting plane 35 are arranged at intervals, so as to also reduce the contact area between the second fitting portion 33 and the second parting plane 35.

[0043] Optionally, as Figure 2 shown, there are multiple forming structures 3, and the multiple forming structures 3 are arranged at intervals along a set direction in the forming mold. In this embodiment, multiple forming structures 3 are provided in a mold at the same time, that is, the mold in this embodiment is a multi-cavity mold, and multiple pipe fittings can be formed at one time, improving production efficiency. In this way, although the mold is designed with multiple forming cavities 31 and more parting planes are generated thereby, since the parting planes on both sides of the forming cavities 31 in the multiple forming structures 3 adopt the above design, the mold does not need to perform fine machining on multiple parting planes to ensure the mold closing accuracy, thereby reducing the manufacturing cost of the multi-cavity mold; when the mold closing accuracy is guaranteed, the male mold 1 and the female mold 2 are more closely attached when they are closed, so that the pipe fittings are not easy to form a mold closing line during the molding process.

[0044] Furthermore, as Figure 2As shown, the cross section of the molding cavity 31 is elliptical and the cross-sectional area of the first cavity 11 is equal to the cross-sectional area of the second cavity 21, and the first parting surface 34 is located at one end of the ellipse along the long axis direction. In this embodiment, the cross sections of both ends of the molding cavity 31 are elliptical. When the first parting surface 34 is close to the far end of the ellipse and away from the near end of the ellipse, since the areas of the first cavity 11 and the second cavity 21 are equal, the structural shapes of the first cavity 11 and the second cavity 21 at both ends are symmetrically arranged. Therefore, when the first parting surface 34 is located at one end of the ellipse along the long axis direction, the second parting surface 35 is located at the other end of the ellipse along the long axis direction. In this embodiment, considering the actual mold making and use, the first parting surface 34 is set at one end close to the major axis of the ellipse and away from the two ends of the minor axis of the ellipse, and the second parting surface 35 is set at the other end close to the major axis of the ellipse and away from the two ends of the minor axis of the ellipse; in this way, the parting lines on both sides of the molding chamber 31 are set at a relatively far position from the outer wall of the tube to be molded and will not affect the demolding, which can reduce the contact force between the outer wall of the tube to be molded and the inner wall of the molding chamber 31 at the parting line when pressurizing to a certain extent, thereby eliminating the parting line and improving the product quality. In other embodiments, the cross-sections of the two ends of the molding chamber 31 can also be trapezoidal, rectangular, etc., which are set according to actual conditions.

[0045] Furthermore, if Figure 2 As shown, the first parting surfaces 34 in the multiple molding structures 3 are flush and parallel to one horizontal plane, and the second parting surfaces 35 in the multiple molding structures 3 are flush and parallel to another horizontal plane. With this arrangement, during machining, multiple first parting surfaces 34 and multiple second parting surfaces 35 can be machined at the same time, thereby improving machining efficiency.

[0046] Furthermore, if Figure 2 As shown, any two adjacent molding structures 3 along the set direction are arranged side by side and at an angle to the vertical direction. That is, multiple molding structures 3 can be designed to be arranged obliquely on the mold. By setting it in this way, the size of the mold in parallel to the set direction and perpendicular to the set direction can be adjusted, and the outer dimensions of the mold can be adjusted to meet the specific installation dimensions required by the workbench. Specifically, in this embodiment, multiple molding structures 3 are arranged side by side along the set direction, and are all arranged at an angle of 30-45 degrees to the vertical direction. In other embodiments, the arrangement form and angle of the multiple molding structures 3 are determined according to the situation of the workbench where the mold is installed.

[0047] Furthermore, if Figure 3 , Figure 6As shown, the male mold 1 is provided with a first connecting surface 12. One end of the first connecting surface 12 is connected to the first avoidance surface 322 of one of the two adjacent and juxtaposed molding structures 3, and the other end is connected to the second avoidance surface 332 of the other of the two molding structures 3; the female mold 2 is provided with a second connecting surface 22. One end of the second connecting surface 22 is connected to the first parting surface 34 of one of the two adjacent and juxtaposed molding structures 3, and the other end is connected to the second parting surface 35 of the other of the two molding structures 3. The first connecting surface 12 and the second connecting surface 22 are arranged at intervals. Specifically, in this embodiment, the two adjacent and juxtaposed molding structures 3 form a clearance design between the first connecting surface 12 and the second connecting surface 22, which can not only reduce the planar contact area between the male mold 1 and the female mold 2, thereby reducing the processing cost, and thus reducing the mold manufacturing cost; but also reduce the interference probability between the male mold 1 and the female mold 2 during mold closing, thereby improving the mold closing quality.

[0048] Furthermore, as Figure 2 shown, in this embodiment, the mold is provided with four molding structures 3. Along the set direction, the first two are juxtaposed, the last two are juxtaposed, and the first two and the last two are oppositely arranged; the first avoidance surface 322 and the first parting surface 34 of the first two molding structures 3 are both located on the left side of the molding structure 3, and the second avoidance surface 332 and the second parting surface 35 of the last two molding structures 3 are both located on the right side of the molding structure 3. At this time, as Figure 4 shown, the first avoidance surface 322 and the second avoidance surface 332 can be designed to intersect between the two adjacent and opposite molding structures 3 in the middle, and the first parting surface 34 and the second parting surface 35 are coplanar. With such a setting, a clearance design can be formed between the first avoidance surface 322, the second avoidance surface 332, the first parting surface 34 and the second parting surface 35, which can not only reduce the planar contact area between the male mold 1 and the female mold 2, but also eliminate the production of a first connecting surface 12 in the male mold 1 and a second connecting surface 22 in the female mold 2, thereby reducing the manufacturing cost of the mold. As Figure 4 shown, in other embodiments, the first avoidance surface 322 and the second avoidance surface 332 are connected in an interleaved manner, and the first parting surface 34 and the second parting surface 35 are connected in an interleaved manner. With such a setting, a clearance design can also be formed between the first avoidance surface 322, the second avoidance surface 332, the first parting surface 34 and the second parting surface 35.

[0049] Further, as Figure 1 、 Figure 9 、 Figure 10As shown, the molding die further includes a first plug 4 and a second plug 5. The first plug 4 includes a first substrate 41 and a plurality of water injection heads 42 disposed on the first substrate 41. The plurality of water injection heads 42 are arranged in one-to-one correspondence with the plurality of molding structures 3, and the water injection heads 42 are used to block one end of the pipe to be molded and inject water into the pipe to be molded. The second plug 5 includes a second substrate 51 and a plurality of sealing heads 52 disposed on the second substrate 51. The plurality of sealing heads 52 are arranged in one-to-one correspondence with the plurality of molding structures 3, and the sealing heads 52 are used to block the other end of the pipe to be molded. In this embodiment, the mold is designed with multiple cavities in one mold. Therefore, correspondingly, the first plug 4 and the second plug 5 also need to be designed with a plurality of water injection heads 42 and a plurality of sealing heads 52 respectively.

[0050] Furthermore, as Figure 9 shown, the first substrate 41 includes a water inlet 411 and a water distribution channel 412 communicating with the water inlet 411. The water injection head 42 includes a water injection port 421 and a water injection channel 422 communicating with the water injection port 421. The plurality of water injection channels 422 are all communicated with the water distribution channel 412. By means of one water inlet 411 and the water distribution channel 412, high-pressure water flow is simultaneously introduced into the plurality of water injection heads 42, reducing the number of water inlets of the first substrate 41 and lowering the manufacturing cost of the first plug 4.

[0051] Optionally, as Figure 11 shown, the male mold 1 has two first inclined surfaces 13 which are oppositely arranged, and one ends of the two first inclined surfaces 13 are respectively connected to the first avoidance surface 322 or the second avoidance surface 332 of the adjacent molding structure 3. The female mold 2 has two second inclined surfaces 23 which are oppositely arranged, and one ends of the two second inclined surfaces 23 are respectively connected to the first mold parting surface 34 or the second mold parting surface 35 of the adjacent molding structure 3. The two first inclined surfaces 13 and the two second inclined surfaces 23 are in one-to-one correspondence and fit together, and the fitting angle forms an angle with the vertical direction.

[0052] Specifically, in this embodiment, as Figure 2As shown, along the set direction, the first two forming structures 3 and the last two forming structures 3 are oppositely arranged. One end of the first inclined surface 13 on the left side of the mold and one end of the first inclined surface 13 on the right side of the mold are both connected to the first avoidance surface 322. One end of the second inclined surface 23 on the left side of the mold and one end of the second inclined surface 23 on the right side of the mold are both connected to the first parting surface 34. With such an arrangement, the inclined surface fitting can provide higher precision, ensuring that the male mold 1 and the female mold 2 can fit closely when mating, reducing the assembly gap and dimensional deviation, thereby improving the mold closing quality. Moreover, the inclined surface fitting can also provide better lubricity and contact area distribution, reducing the stress concentration and wear rate of the mold when stressed, thereby extending the service life of the mold. In other embodiments, the first two forming structures 3 and the last two forming structures 3 are not oppositely arranged but are only arranged side by side. In this case, one end of the first inclined surface 13 on the left side of the mold is still connected to the first avoidance surface 322, while one end of the first inclined surface 13 on the right side of the mold becomes connected to the second avoidance surface 332. One end of the second inclined surface 23 on the left side of the mold is still connected to the first parting surface 34, while one end of the second inclined surface 23 on the right side of the mold becomes connected to the second parting surface 35, and the above effects can still be achieved.

[0053] Furthermore, as Figure 11 shown, a first chamfer is provided at the connection between the second inclined surface 23 and the first parting surface 34. One end of the first inclined surface 13, the first avoidance surface 322, and the first chamfer enclose a first notch 6 at this connection. With such an arrangement, not only can the probability of interference between the male mold 1 and the female mold 2 during mold closing be reduced, but also the contact between the first parting surface 34 and the first inclined surface 13 can be avoided, improving the mold closing quality and preventing the appearance of mold closing lines. First chamfers are provided at the connections between the two second inclined surfaces 23 and the two first parting surfaces 34 respectively.

[0054] Even further, as Figure 11 shown, the male mold 1 further includes two horizontal surfaces respectively corresponding to and connected to the other ends of the two first inclined surfaces 13. A second chamfer is provided at the connection between the first inclined surface 13 and the horizontal surface. The other end of the first inclined surface 13, the horizontal surface, and the second chamfer enclose a second notch 7 at this connection. With such an arrangement, the probability of interference between the male mold 1 and the female mold 2 during mold closing can be reduced, improving the mold closing quality and preventing the appearance of mold closing lines.

[0055] In this embodiment, both the single-cavity mold and the multi-cavity mold per impression can reduce the manufacturing cost of the mold through the above content. For the multi-cavity mold per impression, since the multi-cavity mold per impression has more parting surfaces, when manufacturing the multi-cavity mold per impression, the number of parting surfaces to be machined is more and the machining accuracy requirement is also higher, resulting in a higher manufacturing cost of the multi-cavity mold per impression. In this embodiment, by designing the parting surfaces on both sides of the multiple first cavities 11 of the male mold 1 into the first mating surface 321 and the first relief surface 322, the second mating surface 331 and the second relief surface 332, and keeping the parting surfaces on both sides of the multiple second cavities 21 of the female mold 2 unchanged, using the first mating surface 321 and the second mating surface 331 to abut against the parting surfaces on both sides of the second cavity 21, and setting the first relief surface 322 and the second relief surface 332 at intervals from the parting surfaces on both sides of the second cavity 21, so as to reduce the contact area between the parting surfaces of the male mold 1 and the parting surfaces of the female mold 2. With such a setting, when manufacturing the multi-cavity mold per impression, not only the machining area of the required parting surfaces is reduced, but also the machining accuracy requirement is lowered, thus greatly reducing the manufacturing cost of this type of mold.

[0056] Obviously, the above embodiments of the present invention are merely examples for clearly explaining the present invention, rather than limitations on the embodiments of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A molding die, comprising a male die (1) and a female die (2), wherein the male die (1) and the female die (2) are provided with a molding structure (3), characterized in that, The forming structure (3) includes: A first cavity (11) located in the male mold (1) and a second cavity (21) located in the female mold (2). The first cavity (11) and the second cavity (21) can enclose a forming chamber (31), and both ends of the forming chamber (31) communicate with the outside. The forming chamber (31) is used for placing the pipe fittings to be formed. A first fitting portion (32) and a second fitting portion (33) located on both sides of the first cavity (11), and a first parting surface (34) and a second parting surface (35) located on both sides of the second cavity (21). The first fitting portion (32) includes a first fitting surface (321) and a first avoiding surface (322). The first fitting surface (321) is connected to the first avoiding surface (322). The first fitting surface (321) is used for abutting against the first parting surface (34) and is closer to the first cavity (11) relative to the first avoiding surface (322). The first avoiding surface (322) is spaced from the first parting surface (34). The second fitting portion (33) includes a second fitting surface (331) and a second avoiding surface (332). The second fitting surface (331) is connected to the second avoiding surface (332). The second fitting surface (331) is used for abutting against the second parting surface (35) and is closer to the second cavity (21) relative to the second avoiding surface (332). The second avoiding surface (332) is spaced from the second parting surface (35).

2. The forming mold according to claim 1, characterized in that, When the male mold (1) and the female mold (2) are closed, the end of the first avoiding surface (322) connected to the first fitting surface (321) is flush with the first parting surface (34), and the first avoiding surface (322) gradually moves away from the first parting surface (34) from the end connected to the first fitting surface (321) to the other end. The end of the second avoiding surface (332) connected to the second fitting surface (331) is flush with the second parting surface (35), and the second avoiding surface (332) gradually moves away from the second parting surface (35) from the end connected to the second fitting surface (331) to the other end.

3. A molding die according to claim 1, characterized in that, There are multiple forming structures (3), and the multiple forming structures (3) are arranged at intervals in a set direction on the forming mold.

4. A molding die according to claim 3, characterized in that, The cross-section of the forming chamber (31) is elliptical, and the cross-sectional area of the first cavity (11) is equal to the cross-sectional area of the second cavity (21). The first parting surface (34) is located at one end of the ellipse along the long axis direction.

5. A molding die according to claim 4, characterized in that, The first parting surfaces (34) in the multiple forming structures (3) are flush and all parallel to a horizontal plane, and the second parting surfaces (35) in the multiple forming structures (3) are flush and all parallel to another horizontal plane.

6. A molding die according to claim 4, wherein, Any two adjacent forming structures (3) along the set direction are arranged side by side and are arranged at an angle to the vertical direction.

7. A molding die according to claim 6, characterized in that, The male mold (1) is provided with a first connecting surface (12). One end of the first connecting surface (12) is connected to the first avoidance surface (322) of one of two adjacent and juxtaposed forming structures (3), and the other end is connected to the second avoidance surface (332) of the other of the two forming structures (3). The female mold (2) is provided with a second connecting surface (22). One end of the second connecting surface (22) is connected to the first parting surface (34) of one of two adjacent and juxtaposed forming structures (3), and the other end is connected to the second parting surface (35) of the other of the two forming structures (3). The first connecting surface (12) and the second connecting surface (22) are arranged at intervals.

8. A molding die according to any one of claims 3-7, characterized in that, The forming mold further includes a first plug (4) and a second plug (5). The first plug (4) includes a first substrate (41) and a plurality of water injection heads (42) arranged on the first substrate (41). The plurality of water injection heads (42) are arranged in one-to-one correspondence with the plurality of forming structures (3), and the water injection heads (42) are used to block one end of the pipe fitting to be formed and inject water into the pipe fitting to be formed. The second plug (5) includes a second substrate (51) and a plurality of sealing heads (52) arranged on the second substrate (51). The plurality of sealing heads (52) are arranged in one-to-one correspondence with the plurality of forming structures (3), and the sealing heads (52) are used to block the other end of the pipe fitting to be formed.

9. A molding die according to any one of claims 1-7, characterized in that, The male mold (1) has two first inclined surfaces (13). The two first inclined surfaces (13) are oppositely arranged, and one end of each of the two first inclined surfaces (13) is respectively connected to the first avoidance surface (322) or the second avoidance surface (332) of the adjacent forming structure (3). The female mold (2) has two second inclined surfaces (23). The two second inclined surfaces (23) are oppositely arranged, and one end of each of the two second inclined surfaces (23) is respectively connected to the first parting surface (34) or the second parting surface (35) of the adjacent forming structure (3). The two first inclined surfaces (13) and the two second inclined surfaces (23) are in one-to-one correspondence and are attached, and the attachment angle forms an angle with the vertical direction.

10. A molding die according to claim 9, characterized in that, A first chamfer is provided at the connection between the second inclined surface (23) and the first parting surface (34).

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