An injection mold for producing high-strength fittings

Abstract

The utility model provides a kind of injection mold for producing high-strength accessory belongs to injection mold technical field, including upper die and lower die, the side of upper die and lower die adjacent is all opened with injection cavity, the side of upper die and lower die corresponding is all connected with cooling assembly, cooling assembly includes two groups of cooling plate, the side of upper die and lower die corresponding is all opened with recess, two groups of cooling plate are respectively installed in two groups of recess, the cooling plate between the top of upper die and one group of recess is all opened with first cooling runner corresponding, the cooling plate between the bottom of lower die and another group of recess is all opened with second cooling runner corresponding, first cooling runner and second cooling runner are equipped with communicating piece between;When clamping, communicating piece will slide to communicating position, communicate first cooling runner and second cooling runner, so that coolant can flow immediately in the periphery of plastic cavity after clamping, communicating piece resets after mold opening, disconnect first cooling runner and second cooling runner.

Description

Technical Field

[0001] This utility model belongs to the field of injection mold technology, and more specifically, it relates to an injection mold for producing high-strength parts. Background Technology

[0002] With the development of the automotive industry and high-end equipment manufacturing, the demand for high-strength engineering plastic parts is increasing. Taking automotive lightweighting as an example, the global market size of high-strength plastic parts for automobiles reached US$42 billion in 2023, and it is expected to continue to expand at a compound annual growth rate of 8.7% by 2028. These parts are usually injection molded using high-performance engineering plastics such as polycarbonate, nylon, and polyphenylene sulfide.

[0003] In the production of parts, existing injection molds mostly use fixed straight-through water channels for cooling. The cooling medium needs to be pre-connected through external pipelines when the mold is open. After the mold is closed, it takes several seconds to tens of seconds to establish an effective cooling cycle, which leads to a longer molding cycle. Furthermore, the cooling medium circulation still needs to be maintained during the mold opening stage, resulting in unnecessary energy consumption. Utility Model Content

[0004] To address the aforementioned technical problems, this utility model provides an injection mold for producing high-strength parts. This addresses the issues in the prior art where traditional injection molds use fixed straight-through water channels for cooling, requiring the cooling medium to be pre-connected via external pipes in the mold-open state. After the mold is closed, it takes several seconds to tens of seconds to establish an effective cooling cycle, resulting in a long molding cycle. Furthermore, the need to maintain cooling medium circulation during the mold-opening stage leads to energy waste.

[0005] The purpose and effect of this utility model for producing injection molds for high-strength parts are achieved by the following specific technical means:

[0006] An injection mold for producing high-strength parts includes an upper mold and a lower mold. An injection cavity is provided on the adjacent side of the upper mold and the lower mold. The corresponding side of the upper mold and the lower mold is connected to a cooling component.

[0007] The cooling assembly includes two sets of cooling plates. The upper mold and the lower mold each have a groove on their corresponding sides. The two sets of cooling plates are respectively installed in the two sets of grooves. A first cooling channel is formed between the cooling plate at the top of the upper mold and one of the grooves. A second cooling channel is formed between the cooling plate at the bottom of the lower mold and the other set of grooves. A connecting member is provided between the first cooling channel and the second cooling channel.

[0008] According to a preferred embodiment, the bottom of the upper mold is provided with a sliding groove, and the connecting member is slidably disposed in the sliding groove. Two sets of through connecting holes are provided on the connecting member, one set of which is provided with a liquid inlet connector on the top of the cooling plate. One end of the first cooling channel is connected to the liquid inlet connector, and the other end is connected to the second cooling channel through one set of the connecting holes.

[0009] According to a preferred embodiment, the upper mold has a through hole at the top, a liquid outlet connector is provided at the top of the through hole, and the bottom end is connected to the second cooling channel through another set of connecting holes. Both the liquid inlet connector and the liquid outlet connector are connected to an external coolant supply device.

[0010] Both sets of connecting holes are provided with a first sealing ring at their top ends, and the second cooling channel is provided with a second sealing ring at both ends.

[0011] According to a preferred embodiment, the top of the upper mold is provided with a wedge block, one side of the wedge block is provided with an inclined surface corresponding to the connecting member, a sealing block is provided at the opening of the sliding groove, and a protrusion is provided on the side of the sealing block adjacent to the connecting member, and a spring is provided between the two sets of protrusions.

[0012] According to a preferred embodiment, the bottom of the lower mold is provided with an ejection assembly, the ejection assembly includes an ejection plate, the bottom of the lower mold is provided with the ejection plate which can be raised and lowered, the bottom of the injection cavity and one of the cooling plates are provided with multiple sets of ejection holes, the top of the ejection plate is provided with multiple sets of ejection pins, and the multiple sets of ejection pins are slidably inserted into the multiple sets of ejection holes.

[0013] According to a preferred embodiment, the bottom of the lower mold is connected to a base plate by two sets of square irons. The bottom of the base plate is provided with an installation through groove, and an ejection hydraulic cylinder is provided at the bottom of the installation through groove. The top of the ejection hydraulic cylinder is connected to the ejection plate.

[0014] According to a preferred embodiment, the top of the ejector plate is provided with two sets of reset rods, the top of the lower mold is provided with two sets of reset through holes, the two sets of reset rods are respectively inserted into the two sets of reset through holes, and the bottom of the upper mold is provided with two sets of reset push blocks corresponding to the two sets of reset rods.

[0015] According to a preferred embodiment, each of the multiple sets of ejector pins is provided with an ejector block at its tip, and each of the two sets of reset rods is provided with a push plate at its tip, with the top of the two sets of push plates respectively contacting the two sets of reset push blocks.

[0016] According to a preferred embodiment, the top of the upper mold is provided with an injection hole and an air vent.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. By setting a sliding connecting piece between the cooling plates of the upper and lower molds, and using the inclined surface of the wedge block to cooperate with the connecting piece, the connecting piece is pushed to slide synchronously during the mold closing process, so that the first cooling channel and the second cooling channel can be quickly connected through the connecting hole to form a cooling circulation path that runs through the upper and lower molds. This changes the single heat dissipation mode of the traditional fixed straight water channel. The coolant can flow around the plastic cavity immediately after the mold is closed. In addition, the sealing ring structure between the cooling plate and the mold groove ensures the closed circulation of the coolant and reduces the risk of leakage. At the same time, the spring reset mechanism of the connecting piece automatically cuts off the cooling channel when the mold is opened, avoiding the waste of coolant in the mold opening state.

[0019] 2. By using an ejector plate and multiple sets of ejector pins, the ejector blocks at the tips of the ejector pins are evenly distributed at the bottom of the injection cavity. Compared with the traditional single ejector pin structure, this can disperse the demolding force to multiple areas of the part, avoiding defects such as whitening and deformation caused by local stress concentration. At the same time, the ejector plate is linked with the reset push block of the upper mold through the reset rod. During the mold closing process, the upper mold presses down the reset push block, which drives the reset rod to push the ejector plate to reset, ensuring that the ejector pins return to their initial positions completely before the next injection. This mechanical linkage reset mechanism does not rely on easily worn parts such as springs, avoiding cavity accuracy errors caused by reset deviations in traditional ejection mechanisms. This allows the reset process of the ejector pins to be completed synchronously with the mold closing action, improving the reliability of the demolding mechanism. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] Figure 2 This is an exploded view of the present invention;

[0022] Figure 3 This is a schematic diagram of the structure of the connecting member and the sliding groove after assembly in this utility model;

[0023] Figure 4 for Figure 3 A schematic diagram of the disassembled structure.

[0024] In the diagram, the correspondence between component names and drawing numbers is as follows:

[0025] 11. Upper mold; 12. Lower mold; 13. Injection cavity; 14. Injection hole; 15. Vent hole; 21. Cooling plate; 22. First cooling channel; 23. Second cooling channel; 24. Connecting component; 25. Sliding groove; 26. Connecting hole; 27. Liquid inlet connector; 28. Liquid outlet connector; 29. ​​First sealing ring; 30. Second sealing ring; 31. Wedge block; 32. Sealing block; 33. Spring; 41. Ejector plate; 42. Ejector hole; 43. Ejector pin; 44. Square iron; 45. Base plate; 46. Mounting through groove; 47. Ejector hydraulic cylinder; 48. Reset rod; 49. Reset through hole; 50. Reset push block; 51. Ejector block; 52. Push plate. Detailed Implementation

[0026] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0027] Example:

[0028] As attached Figure 1 To be continued Figure 4 As shown:

[0029] This utility model provides an injection mold for producing high-strength parts, including an upper mold 11 and a lower mold 12. An injection cavity 13 is opened on the adjacent side of the upper mold 11 and the lower mold 12 to form a molding space for the high-strength parts. The corresponding side of the upper mold 11 and the lower mold 12 is connected to a cooling component. The cooling component effectively controls the heat generated during the injection process to ensure the quality stability of the parts during the cooling and solidification stage.

[0030] The cooling assembly includes two sets of cooling plates 21. Grooves are provided on the corresponding sides of the upper mold 11 and the lower mold 12. The two sets of cooling plates 21 are respectively installed in the two sets of grooves. A first cooling channel 22 is provided between the cooling plate 21 at the top of the upper mold 11 and one of the grooves. A second cooling channel 23 is provided between the cooling plate 21 at the bottom of the lower mold 12 and the other groove. A connecting piece 24 is provided between the first cooling channel 22 and the second cooling channel 23 to realize the on / off control of the first cooling channel 22 and the second cooling channel 23.

[0031] Specifically, the first cooling channel 22 and the second cooling channel 23 are connected by a connecting member 24. When the connecting member 24 slides to the connected position, the first cooling channel 22 and the second cooling channel 23 are connected, and the coolant can circulate in the cooling channels of the upper mold 11 and the lower mold 12 to dissipate heat to the surrounding area of ​​the injection cavity 13. When the connecting member 24 slides to the closed position, the connection between the first cooling channel 22 and the second cooling channel 23 is broken, and the end of the first cooling channel 22 used for connection is sealed to prevent coolant leakage or flow in a non-working state.

[0032] Please refer to, for example Figure 2 and Figure 4 As shown, the bottom of the upper mold 11 is provided with a sliding groove 25, which provides a sliding track for the connecting piece 24 to ensure that it moves in a fixed direction during mold closing and mold opening. The connecting piece 24 is slidably set in the sliding groove 25. Two sets of through connecting holes 26 are opened on the connecting piece 24. The two sets of connecting holes 26 correspond to the inlet and outlet paths of the cooling channels. One set of cooling plates 21 is provided with a liquid inlet connector 27 at the top. One end of the first cooling channel 22 is connected to the liquid inlet connector 27, and the other end is connected to the second cooling channel 23 through one set of connecting holes 26. The top of the upper mold 11 is provided with a wedge block 31. One side of the wedge block 31 is provided with a slope corresponding to the connecting piece 24. A sealing block 32 is provided at the opening of the sliding groove 25. The sealing block 32 and the side adjacent to the connecting piece 24 are provided with protrusions. A spring 33 is provided between the two sets of protrusions.

[0033] Specifically, by utilizing the inclined surface on the wedge block 31 in conjunction with the connecting member 24, the vertical movement of the upper mold 11 is converted into the horizontal sliding of the connecting member 24. This mechanical linkage ensures the automatic connection of the cooling channels during the mold closing process without the need for additional power. When the mold is fully closed, the connecting member 24 slides to the connecting position, and the coolant flows into the first cooling channel 22 from the inlet connector 27, enters the second cooling channel 23 through one set of connecting holes 26, and then flows out from the outlet connector 28 through another set of connecting holes 26, forming a cooling cycle around the injection cavity 13. When the mold opens, the upper mold 11 rises, the wedge block 31 disengages from the connecting member 24, and the restoring force of the spring 33 causes the connecting member 24 to slide quickly to the closed position, preventing the coolant from continuing to flow into the cooling channel of the lower mold 12, avoiding unnecessary circulation of the coolant after the mold opens, saving energy and reducing the risk of leakage.

[0034] Please refer to, for example Figure 2 and Figure 4As shown, the upper mold 11 has a through hole at the top, and a liquid outlet connector 28 is provided at the top of the through hole. The bottom end is connected to the second cooling channel 23 through another set of connecting holes 26. Both the liquid inlet connector 27 and the liquid outlet connector 28 are connected to the external coolant supply equipment to form a complete cooling circulation loop. The top of each of the two sets of connecting holes 26 is provided with a first sealing ring 29, and both ends of the second cooling channel 23 are provided with a second sealing ring 30, which respectively seal the connection and end of the cooling channel to prevent the coolant from leaking during high-pressure flow and ensure the airtightness and reliability of the cooling system.

[0035] Specifically, the first sealing ring 29 is installed at the top of the connecting hole 26, tightly fitting the contact surface between the connecting piece 24 and the cooling plate 21, preventing coolant from overflowing from the interface between the connecting hole 26 and the first cooling channel 22. The second sealing ring 30 is installed at both ends of the second cooling channel 23, sealing the ends of the cooling channels in the lower mold 12, preventing coolant from overflowing from the interface between the connecting hole 26 and the second cooling channel 23, ensuring the closed circulation of coolant and reducing the risk of leakage.

[0036] Please refer to, for example Figure 2 As shown, the bottom of the lower mold 12 is provided with an ejection assembly for ejecting the molded parts from the injection cavity 13. The ejection assembly includes an ejection plate 41. The bottom of the lower mold 12 is provided with an ejection plate 41 that can be raised and lowered. The bottom of the injection cavity 13 and one of the cooling plates 21 are provided with multiple sets of ejection holes 42. The top of the ejection plate 41 is provided with multiple sets of ejection pins 43. The multiple sets of ejection pins 43 are slidably inserted into the multiple sets of ejection holes 42. The top of each set of ejection pins 43 is provided with an ejection block 51, which increases the contact area with the parts and ensures that the ejection force is evenly distributed.

[0037] Specifically, in traditional molds, a single ejector pin can easily create concentrated stress on the surface of the part during demolding, leading to whitening or deformation. Multiple sets of ejector holes 42 are evenly distributed at the bottom of the injection cavity 13, and the corresponding multiple sets of ejector pins 43 move synchronously, distributing the demolding force to multiple positions of the part and reducing the stress burden on a single ejector pin. Compared with the traditional single ejector pin structure, it can distribute the demolding force to multiple areas of the part. At the same time, by setting an ejector block 51 at the top of the ejector pin 43, the ejection force is further evenly transmitted, so that the part is subjected to balanced force during demolding, effectively avoiding surface defects or structural deformation caused by excessive local stress, and improving the demolding quality of high-strength parts.

[0038] The top of the ejector plate 41 is provided with two sets of reset rods 48, the top of the lower mold 12 is provided with two sets of reset through holes 49, the two sets of reset rods 48 are respectively inserted into the two sets of reset through holes 49, the bottom of the upper mold 11 is provided with two sets of reset push blocks 50 corresponding to the two sets of reset rods 48, the top of the two sets of reset rods 48 is provided with push plates 52, and the top of the two sets of push plates 52 respectively contacts the two sets of reset push blocks 50;

[0039] Specifically, traditional ejection mechanisms often rely on spring reset, which can easily lead to incomplete reset due to spring fatigue after long-term use. However, in this mold, when the mold closes, the upper mold 11 descends. Utilizing the downward pressing action of the upper mold 11, the reset push block 50 contacts and presses down on the push plate 52, driving the reset rod 48 downward to push the ejector plate 41 to reset. The sliding trajectory of the reset rod 48 within the reset through hole 49 is stable, and in conjunction with the planar contact of the reset push block 50, the ejector pin 43 returns to its initial position. This reset method, which requires no additional power source, avoids the use of easily damaged parts such as springs, reducing maintenance costs. At the same time, it makes the reset process of the ejection mechanism completely synchronized with the mold opening and closing actions, improving the reliability and stability of the demolding mechanism in high-frequency production.

[0040] Please refer to, for example Figure 2 As shown, the bottom of the lower mold 12 is connected to the base plate 45 by two sets of square irons 44, forming a stable support structure; the bottom of the base plate 45 has an installation slot 46, and the bottom of the installation slot 46 is equipped with an ejector hydraulic cylinder 47. The top of the ejector hydraulic cylinder 47 is connected to the ejector plate 41. The ejector hydraulic cylinder 47 drives the ejector plate 41 to rise and fall, thereby realizing the demolding action of the ejector pin 43; the top of the upper mold 11 has an injection hole 14 and an air vent 15. The injection hole 14 is used to inject molten plastic, and the air vent 15 is used to discharge the air inside the cavity during the injection process, ensuring that the molten plastic can completely fill the cavity and avoid molding defects caused by residual gas.

[0041] The embodiments of this utility model are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the utility model to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical applications of this utility model, and to enable those skilled in the art to understand this utility model and design various embodiments with various modifications suitable for a particular purpose.

Claims

1. An injection mold for producing high-strength parts, comprising an upper mold (11) and a lower mold (12), characterized in that: The upper mold (11) and the lower mold (12) are respectively provided with injection cavities (13) on their adjacent sides, and the upper mold (11) and the lower mold (12) are respectively connected to the cooling assembly on their corresponding sides. The cooling assembly includes two sets of cooling plates (21). The upper mold (11) and the lower mold (12) are respectively provided with grooves on their corresponding sides. The two sets of cooling plates (21) are respectively installed in the two sets of grooves. The cooling plate (21) at the top of the upper mold (11) and one of the sets of grooves are respectively provided with a first cooling channel (22). The cooling plate (21) at the bottom of the lower mold (12) and the other set of grooves are respectively provided with a second cooling channel (23). A connecting member (24) is provided between the first cooling channel (22) and the second cooling channel (23).

2. The injection mold for producing high-strength parts according to claim 1, characterized in that: The upper mold (11) has a sliding groove (25) at the bottom. The connecting member (24) is slidably disposed in the sliding groove (25). The connecting member (24) has two sets of through connecting holes (26). One set of the cooling plate (21) has a liquid inlet connector (27) at the top. One end of the first cooling channel (22) is connected to the liquid inlet connector (27), and the other end is connected to the second cooling channel (23) through one set of the connecting holes (26).

3. The injection mold for producing high-strength parts according to claim 2, characterized in that: The upper mold (11) has a through hole at the top, and a liquid outlet connector (28) is provided at the top of the through hole. The bottom end is connected to the second cooling channel (23) through another set of connecting holes (26). The liquid inlet connector (27) and the liquid outlet connector (28) are both connected to an external coolant supply device. The top of each of the two sets of connecting holes (26) is provided with a first sealing ring (29), and the two ends of the second cooling channel (23) are provided with a second sealing ring (30).

4. The injection mold for producing high-strength parts according to claim 2, characterized in that: The upper mold (11) is provided with a wedge block (31) on the top. One side of the wedge block (31) is provided with an inclined surface corresponding to the connecting member (24). A sealing block (32) is provided at the opening of the sliding groove (25). The sealing block (32) and the connecting member (24) are both provided with protrusions on the side adjacent to each other. A spring (33) is provided between the two sets of protrusions.

5. The injection mold for producing high-strength parts according to claim 1, characterized in that: The bottom of the lower mold (12) is provided with an ejection assembly, which includes an ejection plate (41). The bottom of the lower mold (12) is provided with the ejection plate (41) which can be raised and lowered. The bottom of the injection cavity (13) and one of the cooling plates (21) are provided with multiple sets of ejection holes (42). The top of the ejection plate (41) is provided with multiple sets of ejection pins (43). The multiple sets of ejection pins (43) are slidably inserted into the multiple sets of ejection holes (42).

6. The injection mold for producing high-strength parts according to claim 5, characterized in that: The bottom of the lower mold (12) is connected to a base plate (45) by two sets of square iron (44). The bottom of the base plate (45) is provided with an installation through groove (46). The bottom of the installation through groove (46) is provided with an ejection hydraulic cylinder (47). The top of the ejection hydraulic cylinder (47) is connected to the ejection plate (41).

7. An injection mold for producing high-strength parts according to claim 5, characterized in that: The top of the ejector plate (41) is provided with two sets of reset rods (48), the top of the lower mold (12) is provided with two sets of reset through holes (49), the two sets of reset rods (48) are respectively inserted into the two sets of reset through holes (49), and the bottom of the upper mold (11) is provided with two sets of reset push blocks (50) corresponding to the two sets of reset rods (48).

8. An injection mold for producing high-strength parts according to claim 7, characterized in that: Each of the multiple sets of ejector pins (43) is provided with an ejector block (51) at its top end, and each of the two sets of reset rods (48) is provided with a push plate (52) at its top end. The top of each of the two sets of push plates (52) is in contact with the two sets of reset push blocks (50).

9. An injection mold for producing high-strength parts according to claim 1, characterized in that: The upper mold (11) has an injection hole (14) and an air vent (15) on its top.

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