A deep cavity multi-cavity injection mold structure

Abstract

The present invention provides a deep cavity multi-cavity injection mold structure, which includes an ejection mechanism, a gating system and a molding mechanism. Among them, the molding mechanism is used to mold the finished product shape and precise dimensions of the deep cavity multi-cavity; the gating system is used to provide a gating channel for casting the deep cavity multi-cavity finished product; the ejection mechanism is used to eject the deep cavity multi-cavity finished product. The present invention can effectively reduce the manufacturing cost.

Description

Technical Field

[0001] The present invention belongs to the technical field of air storage cylinders, and particularly relates to a deep cavity multi-cavity injection mold structure. Background Art

[0002] At present, most of the large deep cavity injection molds produced in China, such as the drums of washing machines, plastic turnover boxes, household plastic water buckets, plastic stools, plastic trash cans and other large container products, are single cavity. When designing a single cavity injection mold, there is only one mold core, and the mold core can be left as it is or fixed to the mold through a hanging platform and bolts. Due to the simple and single structure, it is very difficult for the mold core to tilt during the injection process.

[0003] Under the development trend of reducing carbon emissions, energy conservation, emission reduction and new energy in the automotive industry, high-strength plastic air storage cylinders for vehicles have emerged. For vehicle safety and to meet relevant performance requirements, the air storage cylinder needs to have high pressure resistance and be designed with a deep cavity multi-cavity structure, and its external dimensions reach more than 280 mm (length) x more than 270 mm (width) x more than 260 mm in height. However, in the existing deep cavity multi-cavity structure during the injection process, the problem of mold core tilting is likely to occur.

[0004] Therefore, it is necessary to design a deep cavity multi-cavity injection mold structure to solve the above existing technical problems. Summary of the Invention

[0005] In view of the above problems, the present invention provides a deep cavity multi-cavity injection mold structure, which includes an ejection mechanism, a gating system and a molding mechanism. Among them,

[0006] The molding mechanism is used to mold the finished shape and precise dimensions of the deep cavity multi-cavity;

[0007] The gating system is used to provide a gating channel for casting the deep cavity multi-cavity finished product;

[0008] The ejection mechanism is used to eject the deep cavity multi-cavity finished product.

[0009] Further, the molding mechanism includes a moving mold core, a moving template and the mold core. Among them,

[0010] The mold core is positioned through the inclined plane of the moving mold core, and both the mold core and the moving mold core are fixed on the moving template by screws.

[0011] Further, the molding mechanism further includes a water channel plate, an oil cylinder seat, a slider oil cylinder, a bearing plate, a slider seat and a main slider. Among them,

[0012] The water channel plate is installed on the moving template by screws;

[0013] The oil cylinder seat is installed on the moving template by bolts;

[0014] The slider oil cylinder is installed on the oil cylinder seat by bolts;

[0015] The slider seat is installed at the output end of the slider oil cylinder;

[0016] The main slider is installed on the slider seat by screws;

[0017] The moving template is installed on the bearing plate by screws.

[0018] Furthermore, the pouring mechanism includes a fixed template, a fixed mold core, a stripping plate, a fixed mold insert, a positioning block, a stripping plate, and a fixed mold fixing plate. Among them,

[0019] The fixed mold fixing plate and the stripping plate are assembled and connected by set screws;

[0020] The stripping plate and the fixed template are assembled and connected by set screws;

[0021] The fixed mold insert is installed on the fixed template by screws;

[0022] The fixed mold core is fixed on the fixed template by screws in cooperation with the fixed mold insert;

[0023] The positioning block is installed on the fixed mold core by screws;

[0024] A hot runner system is installed on the fixed mold fixing plate.

[0025] Furthermore, the molding mechanism further includes an outer ejector plate and an inner ejector plate. Among them,

[0026] The moving mold insert is matched with the inner ejector plate and the outer ejector plate through an inclined surface. Among them,

[0027] The main slider can press the outer ejector plate, and the outer ejector plate can press the moving mold insert from the outside through inclined surface cooperation;

[0028] The inner ejector plate can press the moving mold insert from the inside through inclined surface cooperation under the pressing of the fixed mold core and the positioning block.

[0029] Furthermore, the ejection mechanism includes an inner ejector plate, an outer ejector plate, an ejector pin plate, an ejector pin bottom plate, an ejection oil cylinder, a first ejector rod, and a second ejector rod. Among them,

[0030] The inner ejector plate is installed on the first ejector rod by screws;

[0031] The outer ejector plate is installed on the second ejector rod by screws;

[0032] The first ejector rod is installed on the ejector pin plate by screws;

[0033] The second ejector rod is installed on the ejector pin plate through the hanging platform on the second ejector rod and the ejector pin bottom plate;

[0034] The ejector plate is mounted on the ejector bottom plate by screws;

[0035] The ejector oil cylinder is fixed to the ejector bottom plate by screws, and the ejector oil cylinder is assembled and connected to the fixed mold clamping plate through a hanging platform.

[0036] Furthermore, the depth of the mold core embedded in the moving mold insert reaches 30%, the angle between the mating surface of the mold core and the moving mold insert is 1°, the angle between the mating surface of the outer push plate and the moving mold insert is 10°, the angle between the mating surface of the outer push plate and the water channel plate is 5°, and the angle between the mating surface of the inner push plate and the moving mold insert is 10°.

[0037] The beneficial effects of the present invention are as follows:

[0038] By splitting the formed part of the welding structure of the deep cavity multi-cavity product into two push plates (inner push plate and outer push plate), it is convenient for mold changing and at the same time, it is easy to balance the ejection of the product, preventing the product from deforming during the ejection process.

[0039] The nine-lobe mold core is split into nine mold core inserts. On the one hand, it is convenient for mold processing and manufacturing, greatly shortening the manufacturing cycle. On the other hand, once any one of the mold cores is damaged, a new mold core can be quickly replaced, which is easy to repair and can effectively reduce the manufacturing cost.

[0040] Other features and advantages of the present invention will be described in the following specification, and part of them will become obvious from the specification or be understood by implementing the present invention. The objectives and other advantages of the present invention can be realized and obtained through the structures pointed out in the specification, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0042] Figure 1 Shows a schematic structural diagram of the forming mechanism according to an embodiment of the present invention.

[0043] Figure 2 Shows a schematic structural diagram of the fixed mold clamping plate according to an embodiment of the present invention.

[0044] Figure 3 Shows a schematic structural diagram of the mold structure according to an embodiment of the present invention before the slider oil cylinder operates.

[0045] Figure 4Shows a schematic structural diagram of an ejection mechanism according to an embodiment of the present invention.

[0046] Figure 5 Shows a sectional view of a deep cavity multi-cavity injection mold structure according to an embodiment of the present invention.

[0047] Figure 6 Shows a schematic structural diagram of a gating system according to an embodiment of the present invention.

[0048] Figure 7 Shows a schematic structural diagram of a moving mold core and a moving mold insert according to an embodiment of the present invention. Detailed implementation manners

[0049] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0050] As Figure 1-7 shown, the present invention provides a deep cavity multi-cavity injection mold structure, including an ejection mechanism 103, a gating system 106, and a molding mechanism 100. Among them,

[0051] The molding mechanism 100 is used to mold the finished product shape and precise dimensions of a deep cavity multi-cavity;

[0052] The gating mechanism is used to provide a gating channel for casting a deep cavity multi-cavity product (finished air storage cylinder). Among them, the mold core 17 is a nine-piece mold core;

[0053] The ejection mechanism 103 is used to eject the finished product of a deep cavity multi-cavity.

[0054] The present invention will be described in detail below.

[0055] In some embodiments of the present invention, the molding mechanism 100 includes a moving mold insert 24, a moving template 4, and the mold core 17. Among them, as Figure 5 and Figure 7 shown, the mold core 17 is positioned through the inclined surface of the moving mold insert 24 (that is, the moving mold insert 24 has multiple inclined holes, and then there are multiple mold cores 17. The multiple mold cores 17 are respectively inserted into the multiple inclined holes), and both the mold core 17 and the moving mold insert 24 are fixed to the moving template 4 by screws.

[0056] In some embodiments of the present invention, the molding mechanism 100 further includes a water channel plate 22, an oil cylinder base 12, a slide block oil cylinder 15, a bearing plate 5, a slide block base 13, and a main body slide block 14. Among them,

[0057] The water channel plate 22 (which plays a cooling role. During injection molding, the product is very hot and a plate with water channels is required to quickly cool the product, thereby improving the molding efficiency of the product) is installed on the moving template 4 by screws;

[0058] The oil cylinder base 12 is installed on the moving template 4 by bolts;

[0059] The slide block oil cylinder 15 is installed on the oil cylinder base 12 by bolts;

[0060] The slide block base 13 is installed at the output end of the slide block oil cylinder 15;

[0061] The main body slide block 14 is installed on the slide block base 13 by screws;

[0062] The moving template 4 is installed on the bearing plate 5 by screws.

[0063] Therefore, under the control of the slide block oil cylinder 15, the main body slide block 14 can move. And in the present invention, there are 4 oil cylinder bases 12, slide block oil cylinders 15, slide block bases 13, and main body slide blocks 14 respectively. The outer surface of the main body slide block 14 is an arc surface, so that it can wrap the mold core 17 from multiple directions.

[0064] In some embodiments of the present invention, the molding mechanism 100 further includes a fixed template 3, a fixed mold core 19, a stripper plate 2, a fixed mold insert 18, a positioning block 25, a stripper plate 2 (the stripper plate 2 is a structural plate that separates the finished product from the gating system during the mold opening process, and the stripper plate is controlled by other standard mechanisms, which will not be elaborated here), and a fixed mold fixing plate 1. Among them,

[0065] The fixed mold fixing plate 1 and the stripper plate 2 are assembled and connected by setscrews;

[0066] The stripper plate 2 and the fixed template 3 are assembled and connected by setscrews;

[0067] The fixed mold insert 18 is installed on the fixed template 3 by screws;

[0068] The fixed mold core 19 is fixed on the fixed template 3 by cooperating with the fixed mold insert 18 with screws, and the root of the fixed mold core 19 can be inserted into the fixed mold insert 3;

[0069] The positioning block 25 is installed on the mold core 17 by screws;

[0070] The fixed mold fixing plate 1 is provided with a hot runner system 11.

[0071] In some embodiments of the present invention, the moving mold core 24 cooperates with the inner push plate 20 and the outer push plate 21 through its own inclined surface, where,

[0072] the main slider 14 can press the outer push plate 21, and the outer push plate 21 can press the moving mold core 24 from the outside through the cooperation of its own inclined surface;

[0073] the inner push plate 20 can press the moving mold core 24 from the inside through the cooperation of its own inclined surface under the pressing of the fixed mold core 19 and the positioning block 25.

[0074] In some embodiments of the present invention, the ejection mechanism 103 includes the outer push plate 21, the inner push plate 20, the ejector pin plate 7, the ejector pin bottom plate 8, the ejection oil cylinder 6, the first ejector rod 23 and the second ejector rod 26. The structure (i.e., a deep cavity multi-cavity injection mold structure of the present invention) further includes a support iron 9 and a moving mold fixing plate 10, where,

[0075] the bearing plate 5 is installed on the support iron 9 through screws and pins;

[0076] the support iron 9 is installed on the moving mold fixing plate 10 through screws and pins;

[0077] the inner push plate 20 is installed on the first ejector rod 23 through screws;

[0078] the outer push plate 21 is installed on the second ejector rod 26 through screws;

[0079] the first ejector rod 23 is installed on the ejector pin plate 7 through screws;

[0080] the second ejector rod 26 is installed on the ejector pin plate 7 through the hanging platform (which plays a role in fixing and matching) on the second ejector rod 26 and the ejector pin bottom plate 8;

[0081] the ejector pin plate 7 is installed on the ejector pin bottom plate 8 through screws;

[0082] the ejection oil cylinder 6 is fixed to the ejector pin bottom plate 8 (the ejector pin bottom plate 8 is a movable part) through screws, and the ejection oil cylinder 6 is assembled and connected to the moving mold fixing plate 10 (the moving mold fixing plate 10 is a fixed part) through the hanging platform of the oil cylinder 6. The end of the driving rod of the ejection oil cylinder 6 is fixed to the moving mold fixing plate 10 (the driving rod of the ejection oil cylinder 6 is not shown in the figure). When the ejection oil cylinder 6 is working, the body of the ejection oil cylinder 6 will move upward.

[0083] In some embodiments of the present invention, the depth to which the mold core 17 is embedded in the moving mold insert 24 is controlled to reach 30% (30% of the total height of the mold core 17), the angle of the mating surface between the mold core 17 and the moving mold insert 24 is controlled to be 1°, the angle of the mating surface between the outer push plate 21 and the moving mold insert 24 is controlled to be 10°, the angle of the mating surface between the outer push plate 21 and the water channel plate 22 is controlled to be 5°, and the angle of the mating surface between the inner push plate 20 and the moving mold insert 24 is controlled to be 10°.

[0084] As Figure 5 shown, in order to ensure the mold closing accuracy, ensure the dimensional accuracy of the product, and prevent the nine-piece mold core 17 from tipping over, the moving mold insert 24 is provided with an inner push plate 20 and an outer push plate 21 through inclined surfaces. During the mold closing process, the inner push plate 20 is positioned and pressed by the fixed mold core 19 and the positioning block 25, ensuring the dimensional accuracy of the small cavity in the middle of the product.

[0085] During the mold closing process, the outer push plate 21 is pressed by the reset main slider 14. The outer push plate 21 presses the moving mold insert 24 from the outside through inclined surface mating. In addition to the above, the inner push plate 20 presses the moving mold insert 24 from the inside through inclined surface mating under the pressing of the fixed mold core 19 and the positioning block 25. This can effectively ensure the fixed state of the moving mold insert 24 during the injection molding process. At the same time, the service life of the moving mold insert 24 is improved through this structure.

[0086] Due to the large injection pressure and holding pressure during the injection molding process, the nine-piece mold core 17 may tip over, resulting in irreversible defects in the product and even causing the mold to be unable to produce normally. To avoid such problems, through a large number of simulation analysis calculations, the depth to which the nine-piece mold core 17 is embedded in the moving mold insert 24 can reach 30%. Due to the limitations of the product structure and the mold structure, in the present invention, the angle of the mating surface between the nine-piece mold core 17 and the moving mold insert 24 is set to 1°, the angle of the mating surface between the outer push plate 21 and the moving mold insert 24 is set to 10°, the angle of the mating surface between the outer push plate 21 and the water channel plate 22 is set to 5°, and the angle of the mating surface between the inner push plate 20 and the moving mold insert 24 is set to 10°. Through such a design, it can be ensured that the thin edge thickness of the moving mold insert 24 reaches more than 6.5 mm, and the moving mold insert 24 becomes stronger towards the root. Through the calculation of simulation analysis, the strength of the moving mold insert can meet the design usage requirements, and this structural design can effectively prevent the high-cantilever moving mold insert 24 from tipping over during the injection molding process.

[0087] As Figure 6As shown in the figure, in some embodiments of the present invention, the gating system 106 includes a hot runner system 11, a locating ring 27, a cold runner ejector pin 28, a sprue 29, a gate point 30, a cold runner 31, and a cold slug well 32. In order to disperse the pressure during the injection molding process, through mold flow analysis, the gating system 106 of the deep cavity multi-cavity product is set in the form of hot to cold, which is an upgraded design of the classic three-plate mold. The gate 30 is provided on the cold runner 31, and there are nine of them, which are evenly distributed on the top of the product. The minimum diameter of the gate 30 is set to 3 mm.

[0088] Since the deep cavity multi-cavity product is relatively large in size, the ordinary three-plate mold with a small gate cannot meet the production requirements. Therefore, the traditional small gate sprue needs to be set as a hot runner system 11. Through mold flow analysis, the position of the gate 30 is repeatedly searched for to ensure that while dispersing the injection pressure, the weld line caused by multi-point gating is also avoided from affecting the strength of the deep cavity multi-cavity product. Finally, through repeated mold flow analysis and product structure optimization, the gating system 106 of the deep cavity multi-cavity product is determined.

[0089] In addition, the present invention also has the following advantages:

[0090] 1. There is no relevant design experience in the prior art, and the present invention is introduced through simulation analysis and mold flow analysis, providing technical support for the development of injection molds for large-scale deep cavity multi-cavity products. This is also a pioneer, laying a solid foundation for the injection mold design of more automotive lightweight products in the future.

[0091] 2. Through a large number of theoretical calculations and reasonable and ingenious mold structure designs, the present invention realizes the development of the structure of a large-scale deep cavity multi-cavity injection mold and effectively prevents the tipping of multiple cantilever cores in the cavity during the injection molding process.

[0092] 3. In order to disperse the pressure of the product during the injection molding process, through mold flow analysis and product structure optimization, nine gate points are precisely set. Through such a setting, while effectively dispersing the injection pressure, the weld line defect caused by multi-point gating can also be avoided, effectively improving the service strength of the product.

[0093] The mold structure of the present invention effectively solves the problem of tipping of multiple cores during the injection molding process of the product.

[0094] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments by using the disclosed technical content within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A deep cavity multi-cavity injection mold structure, characterized in that, The structure includes an ejection mechanism (103), a gating system (106), and a molding mechanism (100). Among them, the molding mechanism (100) is used to mold the finished product shape and precise dimensions of a deep cavity and multiple cavities; the gating system (106) is used to provide a gating channel for casting a deep cavity and multiple cavities finished product; the ejection mechanism (103) is used to eject the deep cavity and multiple cavities finished product; Among them, the molding mechanism (100) includes a moving mold core (24), a moving template (4), and a die core (17). The die core (17) is positioned through the inclined surface of the moving mold core (24). Both the die core (17) and the moving mold core (24) are fixed on the moving template (4) by screws; Among them, the molding mechanism (100) further includes a water channel plate (22), and the water channel plate (22) is installed on the moving template (4) by screws; Among them, the molding mechanism (100) further includes an oil cylinder seat (12), a slider oil cylinder (15), a support plate (5), a slider seat (13), and a main slider (14); Among them, the molding mechanism (100) further includes an outer ejector plate (21) and an inner ejector plate (20). The moving mold core (24) is matched with the inner ejector plate (20) and the outer ejector plate (21) through an inclined surface. The main slider (14) can press the outer ejector plate (21), and the outer ejector plate (21) can press the moving mold core (24) from the outside through inclined surface matching; the inner ejector plate (20) can press the moving mold core (24) from the inside through inclined surface matching under the pressing of the fixed die core (19) and the positioning block (25); Among them, the depth of the die core (17) buried into the moving mold core (24) reaches 30%, the angle of the matching surface between the die core (17) and the moving mold core (24) is 1°, the angle of the matching surface between the outer ejector plate (21) and the moving mold core (24) is 10°, the angle of the matching surface between the outer ejector plate (21) and the water channel plate (22) is 5°, and the angle of the matching surface between the inner ejector plate (20) and the moving mold core (24) is 10°.

2. The structure of a deep-cavity multi-cavity injection mold according to claim 1, characterized in that, The oil cylinder seat (12) is installed on the moving template (4) by bolts; The slider oil cylinder (15) is installed on the oil cylinder seat (12) by bolts; The slider seat (13) is installed at the output end of the slider oil cylinder (15); The main slider (14) is installed on the slider seat (13) by screws; The moving template (4) is installed on the support plate (5) by screws.

3. The structure of a deep-cavity multi-cavity injection mold according to claim 2, wherein, The molding mechanism (100) further includes a fixed template (3), a fixed die core (19), a stripper plate (2), a fixed mold core (18), a positioning block (25), a stripper plate (2), and a fixed mold fixing plate (1). Among them, the fixed mold fixing plate (1) and the stripper plate (2) are assembled and connected by setscrews; the stripper plate (2) and the fixed template (3) are assembled and connected by setscrews; the fixed mold core (18) is installed on the fixed template (3) by screws; the fixed die core (19) is fixed on the fixed template (3) by matching with the fixed mold core (18) through screws; the positioning block (25) is installed on the fixed die core (19) by screws; A hot runner system (11) is installed on the fixed mold fixing plate (1).

4. A deep cavity multi-cavity injection mold structure according to claim 3, characterized in that, The ejection mechanism (103) includes an inner ejector plate (20), an outer ejector plate (21), an ejector pin plate (7), an ejector pin bottom plate (8), an ejection oil cylinder (6), a first ejector rod (23), and a second ejector rod (26), wherein, The inner ejector plate (20) is mounted on the first ejector rod (23) by screws; The outer ejector plate (21) is mounted on the second ejector rod (26) by screws; The first ejector rod (23) is mounted on the ejector pin plate (7) by screws; The second ejector rod (26) is mounted on the ejector pin plate (7) through the hanging platform on the second ejector rod (26) and the ejector pin bottom plate (8); The ejector pin plate (7) is mounted on the ejector pin bottom plate (8) by screws; The ejection oil cylinder (6) is fixed to the ejector pin bottom plate (8) by screws, and the ejection oil cylinder (6) is assembled and connected to the fixed mold fixing plate (1) through a hanging platform.

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