An automated structure for large injection molds and a method of manufacturing the same

Abstract

This invention belongs to the field of injection mold technology, and in particular, an automated structure for a large injection mold and its manufacturing method. The structure includes a moving mold, a fixed mold, and a bending core rod. The fixed mold and moving mold are provided with movable cavities for the bending core rod to rotate. The movable cavity has a forming groove that cooperates with the forming end of the bending core rod to form a bent injection molded part. It also includes a first core-pulling mechanism that drives the bending core rod to move at one end of the movable cavity, a plug that seals the forming groove at the other end of the movable cavity, and a second core-pulling mechanism that drives the plug to move coaxially in a spiral motion. A forming boss is coaxially provided on the end face of the plug near the bending core rod, corresponding to the inner cavity of the bent injection molded part. A circumferential forming position is provided on the side wall of the forming boss. The end face of the forming boss is coaxially fitted and pressed against the forming end of the bending core rod. This invention, through the design of the plug and forming boss, combined with the first and second core-pulling mechanisms, can achieve automatic forming of bent injection molded parts and efficient, non-destructive material removal.

Description

Technical Field

[0001] This invention relates to the field of injection mold technology, and in particular to an automated structure for large injection molds and its manufacturing method. Background Technology

[0002] Plastic products are widely used in our daily lives. They are made through injection molding or blow molding. An injection mold is a tool used to produce plastic products; it is also a tool that gives plastic products their complete structure and precise dimensions. Injection molding is a processing method used for the mass production of certain complex-shaped parts. Specifically, it refers to injecting molten material under high pressure into a mold cavity, which then cools and solidifies to obtain the molded product.

[0003] For injection molded pipe parts, the current industry standard for molding is primarily embedded unidirectional core-pulling molds. Traditional embedded core-pulling molds typically employ a hydraulic cylinder core-pulling mechanism. A hinge connects the pipe core rod to the movable rod of the hydraulic cylinder, converting the linear motion of the cylinder into the rotational motion of the core rod. Once the cylinder returns to its original position, the core rod can be axially removed from the cavity of the injection molded part. However, this structure is only suitable for some general-purpose pipe fittings. For special products, such as those requiring internal threading, circumferential grooves, or ribs, existing molds cannot achieve non-destructive demolding and blanking. Therefore, it is necessary to design a new automated mold to meet higher production demands. Summary of the Invention

[0004] The purpose of this invention is to provide an automated structure for large injection molds and a method for manufacturing the same, in order to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an automated structure for a large injection mold, comprising a horizontally opposed moving mold and a fixed mold, and a bending core rod longitudinally rotatably connected to the fixed mold. Both the fixed mold and the moving mold are provided with movable cavities for the longitudinal rotation of the bending core rod. The movable cavity has both ends penetrating the lower sidewall of the fixed mold, and the middle of the movable cavity has a forming groove that cooperates with the forming end of the bending core rod to form a bent injection molded part.

[0006] It also includes a first core-pulling mechanism that drives the bending core rod to reciprocate at one end of the movable cavity, a plug that seals the molding groove at the other end of the movable cavity, and a second core-pulling mechanism that drives the plug to move coaxially in a spiral motion; the plug has a molding boss coaxially provided on one end face of the plug near the bending core rod, corresponding to the inner cavity of the bent injection molded part, and the side wall of the molding boss has a circumferential molding position; when assembled in place, the end face of the molding boss is coaxially fitted and pressed against the molding end of the bending core rod.

[0007] In the automated structure for large injection molds described in this invention, the diameter of the forming end of the bending core rod is the same as the diameter of the forming boss. When assembled in place, the plug and the adjacent end faces of the forming end are coaxially fitted and abut against each other.

[0008] The large injection mold automated structure of the present invention includes a mounting groove on the centripetal side of the movable cavity on the fixed mold, a rotating shaft coaxially rotatably disposed in the mounting groove and the movable cavity, a bent tube core rod fixedly connected to the rotating shaft, and a movable terminal of the first core pulling mechanism connected to the bent tube core rod.

[0009] The automated structure for large injection molds of the present invention includes a heating element embedded in the bending core rod, wherein the heating element is spirally distributed along the axial direction of the bending core rod.

[0010] The automated structure for large injection molds described in this invention includes a heating element that is a thermocouple, and a connection port for connecting the heating element is provided inside the rotating shaft.

[0011] The large injection mold automation structure of the present invention includes a drive shaft coaxially provided on the outer end face of the plug, the drive shaft being rotatably connected to the fixed mold through a bearing assembly, a drive thread being provided on the outer side wall of the drive shaft, and a threaded sleeve adapted to the drive thread being fixedly provided on the fixed mold. The second core pulling mechanism is a motor and is connected to the drive shaft through a shaft connection assembly.

[0012] The automated structure for large injection molds of the present invention includes a shaft connection assembly comprising a connecting shaft coaxially disposed between the drive shaft and the rotating shaft of the second core-pulling mechanism, wherein the drive shaft extends into the connecting shaft and is axially slidably connected to it.

[0013] The automated structure for large injection molds of the present invention includes a shaft connection assembly further comprising a movable outer sleeve ring coaxially rotatably connected to the outside of the connecting shaft; a first flow channel is provided inside the plug; two second flow channels are arranged radially side by side inside the drive shaft and communicating with both ends of the first flow channel; two third flow channels are provided inside the connecting shaft and respectively communicating with the two second flow channels; a first through hole is provided on the peripheral sidewall of the connecting shaft corresponding to the two third flow channels; an annular guide groove is provided circumferentially on the inner wall of the movable outer sleeve corresponding to the first through hole; and a second through hole is radially penetrating on the inner wall of the annular guide groove.

[0014] The automated structure for large injection molds described in this invention includes a first flow channel that is spiral-shaped and coaxial with the plug.

[0015] Furthermore, the present invention also provides an injection molding method for an automated structure of a large injection mold, the injection molding method comprising the following steps:

[0016] Mold assembly:

[0017] The first core-pulling mechanism drives the forming end of the bending die core rod into the forming groove;

[0018] The second core-pulling mechanism drives the plug to make the forming boss enter the forming groove and fit tightly against the end face of the forming end of the bending die core rod.

[0019] The moving mold and the fixed mold close together, and the two molding grooves, the molding end, the molding boss and the plug together form the molding cavity of the molded bent pipe injection molded part;

[0020] Mold making:

[0021] The second core-pulling mechanism drives the plug to cause the molding boss to spirally and axially exit the interior of the bent injection molded part;

[0022] The first core-pulling mechanism drives the forming end of the bending core rod to axially exit the interior of the bent injection molded part;

[0023] The separation of the moving mold from the fixed mold enables mold opening and material removal.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] During mold closing and injection, by designing the molding boss and the molding position on its peripheral wall, a spiral or circumferential rib or groove structure can be formed on the inner wall of the bent injection molded part. With the help of the second core pulling mechanism, the molding boss and the bent injection molded part can be automatically separated efficiently and without damage. Compared with traditional mold technology, it is not only more efficient, but also can process more complex workpieces, has stronger adaptability, and is more conducive to the cost control of enterprises in the production of new products. Attached Figure Description

[0026] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 This is an overall structural diagram of the present invention.

[0028] Figure 2 This is a structural diagram of the moving mold of the present invention.

[0029] Figure 3 This is a schematic diagram of the fixed mold structure of the present invention.

[0030] Figure 4 This is a side view of the mold of the present invention.

[0031] Figure 5 for Figure 4 AA sectional view.

[0032] Figure 6 for Figure 5 Enlarged view of a local structure.

[0033] Figure 7 for Figure 6 Enlarged view of a local structure.

[0034] Figure 8 This is a front view of the mold of the present invention.

[0035] Figure 9 for Figure 8 BB cross-sectional view. Detailed Implementation

[0036] The terms "first," "second," "third," and "fourth," etc., used in the specification, claims, and accompanying drawings of this invention are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or apparatuses.

[0037] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0038] "Multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0039] Furthermore, the terms indicating orientation, such as "up," "down," "left," "right," "upper end," "lower end," and "longitudinal," are all based on the posture and position of the device or equipment described in this solution during normal use.

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, a clear and complete description will be provided below in conjunction with the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the protection scope of the present invention.

[0041] This embodiment discloses, as follows: Figures 1 to 9 The large-scale automated injection mold structure shown includes a horizontally opposed moving mold 10 and a fixed mold 20, and a bending core rod 30 that is longitudinally rotatably connected to the fixed mold 20. Both the fixed mold 20 and the moving mold 10 are provided with movable cavity grooves 40 for the longitudinal rotation of the bending core rod 30. Specifically, the movable cavity groove 40 is annular and located on the injection surface of the mold core 21 on the fixed mold 20. Both ends of the movable cavity groove 40 penetrate the lower sidewall of the fixed mold 20 to facilitate the installation of the drive. Furthermore, the middle part of the movable cavity groove 40 has a forming groove 41 that matches the forming end of the bending core rod 30 to form a bent injection molded part 500. When the bending core rod 30 moves into place during injection, the larger diameter sealing end of the bending core rod 30 seals one end of the forming groove 41. At this time, a forming gap for accommodating molten plastic is formed between the outer wall of the forming end of the bending core rod 30 and the inner wall of the forming groove 41.

[0042] Furthermore, the large injection mold automation structure of this embodiment also includes a first core-pulling mechanism 50 that drives the bending core rod 30 to reciprocate at one end of the movable cavity 40, a plug 60 that seals the molding groove 41 at the other end of the movable cavity 40, and a second core-pulling mechanism 70 that drives the plug 60 to move coaxially in a spiral motion; the first core-pulling mechanism 50 is a linear mechanism such as a hydraulic cylinder, a pneumatic cylinder, or a lead screw module. Preferably, this embodiment uses a hydraulic cylinder and its movable rod extends into the movable cavity 40 and is horizontally hinged to the bending core rod 30 through a hinge 80; wherein, the cylinder body 51 of the hydraulic cylinder is set in the position corresponding to the movable cavity 40 of the fixed mold 20 to avoid interference during mold closing.

[0043] Furthermore, on one end face of the plug 60 near the bending core rod 30, a forming boss 601 is coaxially provided with the inner cavity of the bent injection molded part 500. The side wall of the forming boss 601 is provided with a circumferential forming position 62. The forming position 62 can be any one of external thread, circumferential long groove, and long protrusion. In this embodiment, it is specifically represented by thread. When assembled, the end face of the forming boss 601 is coaxially fitted and pressed against the forming end of the bending core rod 30. When the mold is closed and the glue is injected, by designing the forming boss 601 and the forming position 62 on its circumferential side wall, a spiral or circumferential rib or groove structure can be formed on the inner wall of the bent injection molded part. With the cooperation of the second core pulling mechanism 70, the forming boss 601 and the bent injection molded part can be automatically separated efficiently and without damage. Compared with traditional mold technology, the efficiency is not only higher, but also the complexity of the workpieces that can be processed is higher, the adaptability is stronger, and it is more conducive to the cost control of enterprises for the production of new products.

[0044] In this embodiment, the diameter of the forming end of the bending die core rod 30 is the same as the diameter of the forming boss 601. When assembled in place, the plug 60 and the adjacent end faces of the forming end are coaxially fitted and pressed against each other to ensure that the inner wall of the bent injection molded part is formed more smoothly and flat.

[0045] In this embodiment, the fixed mold 20 is provided with an installation groove 42 on the radial side of the movable cavity 40. A rotating shaft 90 is coaxially and rotatably arranged in the installation groove 42 and the movable cavity 40. The bending mold core rod 30 is fixedly connected to the rotating shaft 90. The movable terminal 52 of the first core pulling mechanism 50 is connected to the upper bending mold core rod 30. Furthermore, guide grooves 43 are provided on both the outer arc sidewall and the inner arc sidewall of the movable cavity 40. A movable seat 100 that can reciprocate is provided in the movable cavity 40. Guide ribs 101 that are adapted to the guide grooves 43 are provided at both ends of the movable seat 100. The fixed end of the bending mold core rod 30 is fixed on the movable seat 100 and achieves smooth sliding in the movable cavity 40 through the cooperation of the guide grooves 43 and the guide ribs 101.

[0046] Furthermore, to ensure the sealing between the bending core rod 30 and the molding cavity after mold closing, the fixed end of the bending core rod 30 facing the moving mold 10 extends higher than the movable cavity groove 40, and the fixed end facing away from the molding groove 41 has a first inclined surface 110. The mold core of the moving mold 10 is provided with a positioning groove 120 corresponding to the fixed end of the bending core rod 30, and a second inclined surface 130 is provided on the inner wall of the positioning groove 120. When the mold is closed, the second inclined surface 130 abuts against the first inclined surface 110 and abuts against the fixed end of the bending core rod 30 to ensure the sealing of the molding cavity and avoid leakage of glue during injection. Similarly, the same abutting structure principle is adopted on the plug 60 to ensure the sealing of both ends of the molding cavity and reduce the sprue generation rate at both ends of the bent injection molded part.

[0047] In this embodiment, a heating element 140 is embedded in the bending core rod 30. The heating element 140 is spirally distributed along the axial direction of the bending core rod 30 to achieve high-precision control of the core temperature of the bending core rod 30, thereby improving the injection quality of the bent injection molded part (the bending core rod 30 needs to be relatively movable relative to the fixed mold 20, which also makes it impossible to control the internal temperature of the existing technology, which will further lead to shrinkage wrinkles and uneven internal stress on the inner wall of the injection molded part - this problem is a major drawback of core-pulling injection molds). The heating element 140 is specifically a thermocouple. In order to ensure the normal power supply of the thermocouple, a connection port for connecting the heating element 140 is provided in the rotating shaft 90. This connection port is realized by the coaxial channel 91 in the rotating shaft 90 and the opening 92 in its inner wall. Correspondingly, the movable seat 100 also has a wiring groove 102 for wire arrangement, so that the rotating shaft 90 passes through the fixed mold 20 and its core and the wire is introduced from the back of the fixed mold 20.

[0048] Furthermore, in order to ensure the stability of the rotating shaft 90, a fixing seat 150 is provided in the mounting groove 42 to fix the end of the rotating shaft 90. The fixing seat 150 is fixedly connected to the mold core 21 of the fixed mold 20 by bolts. The wire enters the bending mold core rod 30 from the opening 92 on the side wall of the rotating shaft 90 and the channel in the fixing seat 150 and is connected to the thermocouple. This design can realize the fully hidden layout of the wire.

[0049] In this embodiment, a drive shaft 61 is coaxially and integrally provided on the outer end face of the plug 60. The drive shaft 61 is rotatably connected to the fixed mold 20 through a bearing assembly 160. Specifically, there are two bearing assemblies 160 arranged axially side by side. Each bearing assembly 160 includes a bearing body 161 coaxially fixed on the drive shaft 61 and a bearing seat 162 that fixes the bearing body 161 on the mold core of the fixed mold 20. Furthermore, a drive thread 610 is provided on the outer side wall of the drive shaft 61. The drive thread 610 is located between the two bearing assemblies 160. A threaded sleeve 190 adapted to the drive thread 610 is fixed on the fixed mold 20. The second core-pulling mechanism 70 is a motor and is connected to the drive shaft 61 through a shaft connection assembly 170. Through the layout design of the two bearing assemblies 160, the coaxiality of the plug 60 and the drive shaft 61 in advancing and retracting can be ensured, making the sealing accuracy of the plug 60 to the molding cavity higher.

[0050] In practice, in order to avoid interfering with the mold closing process of the fixed mold 20 and the moving mold 10, the fixed mold 20 and its mold core 21 are provided with receiving grooves 210 for accommodating the two bearing assemblies 160 and the threaded sleeve 190. Half of the receiving groove 210 is located on the mold core 21 of the fixed mold 20, and the other half is located on the fixed mold 20. The receiving groove 210 is also used to allow the plug 60 to move forward and backward, so that the plug 60 can be removed from the molding cavity for replacement or maintenance.

[0051] In addition, to facilitate the installation or removal of the plug 60, a guide rail assembly 180 that can be in the same direction as the drive shaft 61 is provided on the fixed mold 20 at the end of the movable cavity 40. The second core pulling mechanism 70 is provided on the slider of the guide rail assembly 180. However, it should be noted that under normal working conditions, the slider of the guide rail assembly 180 is fixed to the fixed mold 20 by bolts.

[0052] In this embodiment, the shaft connection assembly 170 includes a connecting shaft 171 coaxially disposed between the drive shaft 61 and the rotating shaft 71 of the second core-pulling mechanism 70. The end of the drive shaft 61 extends into the connecting shaft 171 and is axially slidably connected to it, so as to provide the necessary travel space for the forward and backward movement of the plug 60, and to isolate the action and reaction forces of the second core-pulling mechanism 70 and the drive shaft 61 in the axial direction. It should be noted that the cross-section of the end of the drive shaft 61 that extends into the connecting shaft 171 is specifically elliptical, so as to facilitate the transmission of torque and also facilitate the setting of a sealing ring in the connecting shaft 171.

[0053] In this embodiment, the shaft connection assembly 170 further includes a movable outer sleeve ring 172 coaxially rotatably connected to the outside of the connecting shaft 171; the plug 60 is provided with a first flow channel 63, the drive shaft 61 is provided with two second flow channels 611 arranged radially side by side and communicating with both ends of the first flow channel 63, the connecting shaft 171 is provided with two third flow channels 1710 respectively communicating with the two second flow channels 611, the peripheral sidewall of the connecting shaft 171 is provided with a first through hole 1711 corresponding to the two third flow channels 1710, and the inner wall of the movable outer sleeve ring 172 is circumferentially connected to the first through hole 1711. An annular guide groove 1721 is provided, and a second through hole 1722 is radially provided on the inner wall of the annular guide groove 1721. By installing nozzles in the two second through holes 1722, heat transfer oil can be circulated in the drive shaft 61 and the plug 60 to quickly cool the part corresponding to the forming boss 601 of the bent tube injection molded part before mold opening. This ensures that the plug 60 does not stick to the forming position 62 during the process of rotating out of the bent tube injection molded part, which would lead to demolding failure or damage to the injection molded part due to the torque generated during the process. This significantly improves the yield of demolding.

[0054] Furthermore, in order to ensure the independence of the two second flow channels 611 inside the drive shaft during the axial relative movement with the connecting shaft, an extension tube 612 is provided on the end face of the drive shaft 61 that extends into the connecting shaft, corresponding to the two second flow channels. Correspondingly, a clearance groove 1712 adapted to the extension tube 612 is provided on the bottom surface of the inner cavity 1713 of the connecting shaft into which the drive shaft is inserted.

[0055] In addition, the hollow design of the drive shaft 61 makes it easier to heat treat and strengthen its inner and outer walls to improve the bending resistance of the drive shaft 61 and ensure the sealing accuracy of the plug 60.

[0056] In this embodiment, the first flow channel 63 is spiral-shaped and coaxial with the plug 60 to prolong the contact time between the heat exchange fluid and the plug 60 and accelerate the heat exchange speed.

[0057] Furthermore, this embodiment also provides an injection molding method for an automated structure of a large injection mold, the injection molding method comprising the following steps:

[0058] Mold assembly:

[0059] The first core-pulling mechanism 50 drives the forming end of the bending die core rod 30 into the forming groove 41;

[0060] The second mechanism drives the plug 60 to make the forming boss 601 enter the forming groove and fit tightly against the end face of the forming end of the bending die core rod 30.

[0061] The moving mold 10 and the fixed mold 20 close together, and the two forming grooves 41, the forming end, the forming boss and the plug 60 together enclose the forming cavity of the molded bent tube injection part.

[0062] Mold making:

[0063] The second core-pulling mechanism 70 drives the plug 60 to cause the molding boss 601 to spirally and axially exit the interior of the bent injection molded part.

[0064] The first core-pulling mechanism 50 drives the forming end of the bending mold core rod 30 to axially exit the interior of the bent injection molded part.

[0065] The moving mold 10 and the fixed mold 20 are separated to achieve mold opening and material removal.

[0066] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. An automated structure for a large injection mold, comprising a horizontally opposed moving mold and a fixed mold, and a bent tube core rod rotatably connected longitudinally to the fixed mold, wherein both the fixed mold and the moving mold are provided with movable cavities for longitudinal rotation of the bent tube core rod, characterized in that, Both ends of the movable cavity groove penetrate the lower sidewall of the fixed mold, and the middle part of the movable cavity groove has a forming groove for forming the bent tube injection molded part by cooperating with the forming end of the bent tube mold core rod. It also includes a first core-pulling mechanism that drives the bending core rod to reciprocate at one end of the movable cavity, a plug that seals the molding groove at the other end of the movable cavity, and a second core-pulling mechanism that drives the plug to move coaxially in a spiral motion; the plug has a molding boss coaxially provided on one end face of the plug near the bending core rod, corresponding to the inner cavity of the bent injection molded part, and the side wall of the molding boss has a circumferential molding position; when assembled in place, the end face of the molding boss is coaxially fitted and abutted against the molding end of the bending core rod; The fixed mold is provided with a mounting groove on the radial side of the movable cavity. A rotating shaft is provided in the mounting groove and rotates coaxially with the movable cavity. The bending core rod is fixedly connected to the rotating shaft. The movable terminal of the first core pulling mechanism is connected to the bending core rod. A drive shaft is coaxially provided on the outer end face of the plug. The drive shaft is rotatably connected to the fixed mold through a bearing assembly. A drive thread is provided on the outer side wall of the drive shaft. A threaded sleeve adapted to the drive thread is fixed on the fixed mold. The second core-pulling mechanism is a motor and is connected to the drive shaft through a shaft connection assembly. The shaft connection assembly includes a connecting shaft coaxially disposed between the drive shaft and the rotating shaft of the second core-pulling mechanism, wherein the drive shaft extends into the connecting shaft and is axially slidably connected to it; The shaft connection assembly further includes a movable outer sleeve ring coaxially rotatably connected to the outside of the connecting shaft; the plug is provided with a first flow channel, the drive shaft is provided with two second flow channels radially arranged side by side and communicating with both ends of the first flow channel, the connecting shaft is provided with two third flow channels respectively communicating with the two second flow channels, the peripheral sidewall of the connecting shaft is provided with a first through hole corresponding to the two third flow channels, the inner wall of the movable outer sleeve is provided with an annular guide groove circumferentially corresponding to the first through hole, and the inner wall of the annular guide groove is provided with a second through hole radially penetrating through.

2. The automated structure for large injection molds according to claim 1, characterized in that, The diameter of the forming end of the bending die core rod is the same as the diameter of the forming boss. When assembled, the plug and the adjacent end faces of the forming end are coaxially fitted and abut against each other.

3. The automated structure for large injection molds according to claim 1, characterized in that, The bending die core rod is embedded with a heating element, which is spirally distributed along the axial direction of the bending die core rod.

4. The automated structure for large injection molds according to claim 3, characterized in that, The heating element is a thermocouple, and the rotating shaft has a connection port for connecting to the heating element.

5. The automated structure for large injection molds according to claim 1, characterized in that, The first flow channel is spiral-shaped and coaxial with the plug.

6. An injection molding method for an automated structure of a large injection mold, applied to the automated structure of the large injection mold as described in any one of claims 1-5, characterized in that, The injection molding method includes the following steps: Mold assembly: The first core-pulling mechanism drives the forming end of the bending die core rod into the forming groove; The second core-pulling mechanism drives the plug to make the forming boss enter the forming groove and fit tightly against the end face of the forming end of the bending die core rod on the same axis. The moving mold and the fixed mold close together, and the two molding grooves, the molding end, the molding boss and the plug together form the molding cavity of the molded bent pipe injection molded part; Mold making: The second core-pulling mechanism drives the plug to cause the molding boss to spirally and axially exit the interior of the bent injection molded part; The first core-pulling mechanism drives the forming end of the bending core rod to axially exit the interior of the bent injection molded part; The separation of the moving mold from the fixed mold enables mold opening and material removal.

Images