Deep-cavity mold based on insert design

Abstract

The utility model discloses a deep-cavity mold based on insert design, and particularly aims to exhaust, cooling and processing optimization of a large-area rib area in the deep-cavity mold. The first insert is arranged on the mold core, and the insert is provided with the main body part and the convex mounting part, so that the insert can be tightly embedded into the mold core. The mold core is provided with a first runner hole, and the first insert is provided with a second runner hole communicated with the first runner hole, so that smooth flowing of plastic melt is ensured. Meanwhile, a first waterway channel is formed in the bottom layer of the template, a second waterway channel communicated with the first insert bulge mounting part is formed in the first insert bulge mounting part, the cooling path is optimized, and the cooling efficiency is improved. And the second waterway channel design comprises a transverse channel part, a first longitudinal channel part, a second longitudinal channel part and a second through hole, so that the cooling medium is uniformly distributed. In addition, the mold core is further provided with a second insert and a third insert, so that the problem of gas retention at rib positions with smaller areas is solved. According to the utility model, the mold processing efficiency and the product precision are improved, the cost is saved, and the injection molding defect is avoided.

Description

Technical Field

[0001] This utility model relates to the field of mold technology, and in particular to a deep cavity mold based on insert design, specifically an insert structure design that optimizes venting, cooling and processing of large-area rib areas in a deep cavity mold. Background Technology

[0002] During the injection molding or forming process, most products with large rib areas present challenges in machining and polishing. This results in EDM (Electrical Discharge Machining) requiring a longer processing time for these areas.

[0003] Chinese Patent Publication No. CN211941865U describes a double-outlet, large-cavity injection mold for sanitation plastic trash cans. This mold divides a traditional injection mold into two parts, fixed on a single upper and lower mold plate. This allows for the molding of two products in a single operation, improving production efficiency. Furthermore, a cooling channel system surrounds the deep cavity, enhancing cooling efficiency and preventing insufficient cooling that could hinder subsequent demolding. However, like traditional molds, this patent's venting system relies primarily on conventional venting grooves on the parting surface. It lacks optimization for venting trapped air in deep cavity ribs and large-area rib areas, potentially leading to defects such as bubbles, shrinkage marks, and scorching during injection molding. Additionally, while the patent improves cooling efficiency, it only cools the area around the deep cavity, lacking cooling methods for critical areas like the aforementioned large-area rib areas, resulting in limited cooling effectiveness.

[0004] Therefore, a deep cavity mold optimized for venting, cooling, and machining of large-area rib areas in deep cavity molds is particularly important. Utility Model Content

[0005] The present invention aims to provide a deep cavity mold based on insert design to solve the problems of insufficient venting, uneven cooling and low processing efficiency in large-area rib areas of deep cavity molds.

[0006] The technical solution adopted in this utility model is as follows:

[0007] A deep cavity mold based on insert design includes: a template 1, on which a mold core 2 is provided, and one or more forming cavities are recessed on the mold core 2, wherein a first insert 3 is provided on the forming cavity of the mold core 2 corresponding to the large area rib area of ​​the product.

[0008] Preferably, the first insert 3 has a main body 31 and a smaller protruding mounting part 32 formed by protruding from the bottom wall of the main body 31; the mold core 2 has a plurality of vertical first flow channel holes 21, the main body 31 has a second flow channel hole 33 communicating with the first flow channel holes 21; the mold core 2 has a limiting groove 22 recessed at the corresponding position of the protruding mounting part 32.

[0009] Preferably, the template 1 has multiple first water channels 11 inside its bottom layer, and the first insert 3 has a second water channel 34 inside its protruding mounting part 32 that communicates with the first water channels 11; the bottom wall of the limiting groove 22 has a first through hole 23 that communicates with the first water channels 11 and the second water channels 34 respectively.

[0010] Preferably, the second waterway channel 34 includes: a transverse channel portion 341, a first longitudinal channel portion 342 connected to one end of the transverse channel portion 341, and a second through hole 343 opened on one side wall of the protruding mounting portion 32; the transverse channel portion 341 is also connected to a second longitudinal channel portion 344 near the second through hole 343; the lower ends of the first longitudinal channel portion 342 and the second longitudinal channel portion 344 are connected to the first through hole 23.

[0011] Preferably, the second through hole 343 is fitted to one side wall of the limiting groove 22 to achieve one-sided sealing.

[0012] Preferably, the mold core 2 is provided with a second insert 4 and a third insert 5 on the molding cavity of the sealing area where gas is easily trapped in the smaller area of ​​the ribs of the corresponding product.

[0013] Preferably, the first insert 3 is installed in the molding cavity of a large rib area whose projected area accounts for more than 15% of the total projected area of ​​the product.

[0014] The beneficial effects of this utility model are as follows:

[0015] 1. This design addresses the large rib areas of the product by incorporating a first insert into the mold core. This optimizes the molding effect in these areas, reduces gas retention and defects, and better addresses the challenges of machining deep ribs and the resulting air trapping. The first insert is specifically designed with a main body and a raised mounting portion. The smaller raised mounting portion allows the insert to be tightly embedded in the mold core, enhancing the overall stability of the mold. Furthermore, the limiting groove further restricts and fixes the first insert, limiting its movement during injection molding and preventing injection defects caused by insert displacement. The mold core has multiple vertical first runner holes, while the main body has second runner holes that communicate with these first runner holes. This ensures smooth flow of the molten plastic within the mold, guaranteeing the quality of the molded product. The connection between the first and second runner holes allows the molten plastic to enter the mold cavity more quickly, shortening the injection molding cycle and improving production efficiency.

[0016] 2. By setting a second water channel inside the protruding mounting part of the first insert and connecting it with the first water channel at the bottom of the template, the cooling medium can flow not only through the bottom area of ​​the mold but also through the protruding mounting part and its surrounding area, thus optimizing the cooling path, improving the mold cooling method, increasing cooling efficiency, and helping to improve the product defect rate.

[0017] 3. This design, by dividing the second water channel into a transverse channel, a first longitudinal channel, and a second longitudinal channel, creates a stable and simple cooling path, optimizing the water path while saving costs. Furthermore, the design of the second through-hole allows the cooling medium to more easily enter and exit the second water channel. The combination of the transverse and longitudinal channel sections enables a more uniform distribution of the cooling medium within the mold, helping to reduce the temperature gradient inside the mold and thus improving the precision and surface quality of the injection molded products. Attached Figure Description

[0018] Figure 1 This is a structural diagram of the case;

[0019] Figure 2 The structural diagrams of all the inlays are hidden in this case;

[0020] Figure 3 For this case Figure 2 Enlarged view of point A;

[0021] Figure 4 A structural diagram of the product manufactured using the mold in this case;

[0022] Figure 5 This is a three-dimensional structural diagram of the first inlay in this case;

[0023] Figure 6 A perspective view of the template with the mold core installed in this case;

[0024] Figure 7 This is a perspective view of the first inlay in this case;

[0025] Figure 8 This is a top view of the deep cavity mold and the products manufactured in this case;

[0026] Figure 9 For this case Figure 8 A schematic diagram of the cross-section along the BB direction. Detailed Implementation

[0027] To make the technical problems, technical solutions and advantages of this utility model clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0028] like Figures 1 to 9 As shown, a deep cavity mold based on insert design includes: a template 1, wherein the template 1 has a partially protruding mold core 2 formed in its middle, and one or more molding cavities are recessed on the mold core 2. The multiple molding cavities are divided into a first molding cavity 61 with greater depth and larger area, corresponding to a sealed top of the formed product 100, and a second molding cavity 62 with greater depth but smaller area, corresponding to an unsealed top of the formed product. In actual production, the area where the projected area of ​​the molding cavity accounts for more than 15% of the total projected area of ​​the product is defined as a large area. The mold core 2 typically has a first insert 3 embedded in the molding cavity (i.e., the aforementioned first molding cavity 61) in the area corresponding to the large-area ribs of the product and with a sealed top (which is an area where gas easily stagnates). The large-area ribs of the product can be mesh-like reinforcing ribs or continuous ribs, or they can be ribs in large polished areas (referring to parts of the mold or product with specific structural shapes that require enhanced polishing), specifically as follows... Figure 4 The product 100 shown has a first recessed groove 200 that is deep, large in area and sealed at the top after injection molding. This groove is the large-area rib area of ​​the product and the sealed area at the top.

[0029] In one specific implementation, the first insert 3 of this case is provided with a main body 31 and a smaller protruding mounting part 32 formed by protruding from the bottom wall of the main body 31; the mold core 2 is provided with a plurality of vertical first flow channel holes 21, the main body 31 is provided with a second flow channel hole 33 communicating with the first flow channel holes 21; the mold core 2 is recessed with a limiting groove 22 at the corresponding position of the protruding mounting part 32.

[0030] As described above, this invention addresses the large rib areas of the product by embedding a first insert in the mold core. This helps optimize the molding effect in these areas, reducing gas retention and defects, and better addressing the challenges of machining deep ribs and the problem of trapped air. The first insert is specifically designed with a main body and a raised mounting portion. The smaller raised mounting portion allows the insert to be tightly embedded in the mold core, enhancing the overall stability of the mold. Furthermore, the limiting groove further limits and fixes the first insert, restricting its movement during injection molding and preventing injection defects caused by insert displacement. The mold core has multiple vertical first runner holes, while the main body has second runner holes that communicate with these first runner holes. This ensures smooth flow of the molten plastic within the mold, guaranteeing the quality of the injection-molded product. The connection between the first and second runner holes allows the molten plastic to enter the mold cavity more quickly, shortening the injection cycle and improving production efficiency.

[0031] Furthermore, when the projected area of ​​the ribs accounts for more than 15% of the total projected area of ​​the product, the problem of gas retention in large rib areas is usually quite serious. By limiting this range, the relationship between processing difficulty and cost can be balanced. If the range is too small, the first insert may need to be pre-installed in most areas of the molding cavity, increasing processing difficulty and cost. In specific implementation, the projected area is calculated as follows: the orthographic projection contour of the ribs on the parting surface is extracted using 3D CAD software, and its proportion of the total projected area of ​​the product is calculated.

[0032] As a preferred implementation method, such as Figures 5 to 7 As shown, the template 1 has multiple first water channels 11 inside its bottom layer, and the first insert 3 has a second water channel 34 inside its protruding mounting part 32 that communicates with the first water channels 11; the bottom wall of the limiting groove 22 has a first through hole 23 that communicates with the first water channels 11 and the second water channels 34 respectively.

[0033] As described above, this invention provides a second water channel 34 inside the protruding mounting portion 32 of the first insert 3, which is connected to the first water channel 11 at the bottom of the template 1. This allows the cooling medium to flow not only through the bottom area of ​​the mold but also through the protruding mounting portion and its surrounding area, thus optimizing the cooling path, improving the mold cooling method, increasing cooling efficiency, and helping to improve the product defect rate.

[0034] As a preferred implementation method, such as Figures 5 to 9As shown, the second water channel 34 includes: a transverse channel portion 341, a first longitudinal channel portion 342 connected to one end of the transverse channel portion 341, and a second through hole 343 formed on one side wall of the protruding mounting portion 32; the transverse channel portion 341 is also connected to the second longitudinal channel portion 344 near the second through hole 343; the lower ends of the first longitudinal channel portion 342 and the second longitudinal channel portion 344 communicate with the first through hole 23. Thus, by designing the second water channel 34 as a transverse channel portion, a first longitudinal channel portion, and a second longitudinal channel portion, a stable and simple cooling path is formed, optimizing the water path while saving costs. Furthermore, the design of the second through hole allows the cooling medium to more easily enter and exit the second water channel. The combination of the transverse and longitudinal channel portions allows the cooling medium to be distributed more evenly inside the mold, helping to reduce the temperature gradient inside the mold, thereby improving the precision and surface quality of the injection molded product.

[0035] As a preferred implementation method, such as Figure 9 As shown, the second through hole 343 is tightly fitted against one side wall of the limiting groove 22 to achieve a one-sided seal. Thus, the second through hole, as part of the cooling water channel, forms an effective seal with the side wall of the limiting groove. This prevents leakage of cooling media such as water or cooling oil inside the mold, maintaining pressure balance within the mold and ensuring the normal operation of the cooling system. Furthermore, the one-sided seal allows the cooling media to smoothly enter the mold through the second through hole and circulate through the transverse channel, the first longitudinal channel, and the second longitudinal channel, forming a complete cooling water circulation system, which further improves the cooling effect.

[0036] As a preferred implementation method, such as Figure 1 As shown, the mold core 2 is provided with a second insert 4 and a third insert 5 on the molding cavity (such as the second molding cavity) corresponding to the gas-prone sealed area of ​​the ribs in the smaller area of ​​the product. In this way, not only is it beneficial for the large-area gas-prone sealed area, but it can also work together with the second insert and the third insert to solve the problem of gas-prone sealed areas in the smaller area of ​​the ribs of the product.

[0037] In summary, the design of the first insert in this case, especially the protruding mounting portion, allows the insert to be tightly and precisely embedded in the mold core, thereby reducing the complexity and area required for EDM processing. The positioning grooves precisely control and fix the insert's position within the mold. This reduces the number of adjustments and corrections during EDM processing, improving processing efficiency and costs. The design of the first insert itself helps improve venting conditions inside the mold, reducing gas retention and injection defects. Furthermore, the design of the cooling water channels inside the first insert optimizes mold cooling, effectively improving product defect rates. Due to the shortened EDM processing cycle and reduced processing difficulty, mold processing costs are significantly reduced, saving approximately 180,000 to 200,000 RMB. Moreover, the prefabricated first insert improves the air trapping problem in large-area rib areas, effectively preventing severe sticking to the mold.

[0038] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A deep cavity mold based on insert design, characterized by, The utility model relates to a moulding die for injection moulding, comprising: a moulding plate (1) provided with a moulding core (2) having one or more moulding cavities formed therein, the moulding core (2) being provided with a first insert (3) in the moulding cavity corresponding to a large-area rib area of a product.

2. The deep cavity mold of claim 1, wherein, The first insert (3) is provided with a main body (31) and a smaller protruding mounting portion (32) protruding from the bottom wall of the main body (31); the moulding core (2) is provided with a plurality of vertical first flow channel holes (21), the main body (31) is provided with second flow channel holes (33) in communication with the first flow channel holes (21); and the moulding core (2) is provided with a limiting groove (22) at a position corresponding to the protruding mounting portion (32).

3. The deep cavity mold of claim 2, wherein, The moulding plate (1) is provided with a plurality of first water channel passages (11) inside the bottom layer, the first insert (3) is provided with second water channel passages (34) in communication with the first water channel passages (11) inside the protruding mounting portion (32); and the bottom wall of the limiting groove (22) is provided with first through holes (23) in communication with the first water channel passages (11) and the second water channel passages (34), respectively.

4. The deep cavity mold of claim 3, wherein, The second water channel passages (34) comprise: a transverse channel portion (341), a first longitudinal channel portion (342) connected to one end of the transverse channel portion (341), and second through holes (343) formed in one side wall of the protruding mounting portion (32); the transverse channel portion (341) is further connected to a second longitudinal channel portion (344) at a position close to the second through holes (343); and the lower ends of the first longitudinal channel portion (342) and the second longitudinal channel portion (344) are in communication with the first through holes (23).

5. The deep cavity mold of claim 4, wherein, The second through holes (343) are in close contact with one side wall of the limiting groove (22) to achieve one-side sealing.

6. The deep cavity mold of claim 1, wherein, The moulding core (2) is provided with a second insert (4) and a third insert (5) in the moulding cavity corresponding to a small-area rib area of a product, where gas is prone to accumulate.

7. The deep cavity mold of claim 1, wherein, The first insert (3) is installed in the moulding cavity of a large-area rib area having a projection area accounting for more than 15% of the total projection area of the product.

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