Die

Abstract

The utility model provides a mold. The mold comprises a mold body and a flow choking block. An injection molding cavity is formed in the mold body, a feeding port is formed in the mold body, and a melt enters the injection molding cavity through the feeding port; the flow choking block is arranged at the feeding port, a gap exists between the flow choking block and the inner wall of the feeding port, and the flow choking block is used for slowing down flowing of melt at the feeding port. According to the mold provided by the embodiment of the invention, the flow choking block is additionally arranged at the feed port, the speed of the melt passing through the feed port is reduced in a physical speed reduction mode, the overall injection speed of an injection machine is not changed, and qualified products are produced in the environment with lower mold temperature and uniform injection speed. Due to the arrangement of the flow choking block, the melt can flow more uniformly in the injection molding cavity, the defects of non-uniform filling, sink marks, bubbles and the like caused by non-uniform flow speed can be eliminated, and the overall consistency and qualified rate of products are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molding, and particularly relates to a mold. Background Art

[0002] Currently, in the injection molding production process, especially for products made of materials such as PCABS, there is a common problem: obvious white air marks will appear at the injection feeding port position. To address this problem, traditional manufacturing methods tend to set the mold temperature very high and significantly slow down the injection speed when the material flows through the gate area. However, although this treatment method can alleviate the air mark phenomenon to a certain extent, it also brings significant side effects: it prolongs the product molding cycle, makes the filling process less stable, and ultimately leads to a significant increase in the production cost of parts. Summary of the Utility Model

[0003] In view of this, the purpose of the utility model is to overcome the deficiencies in the prior art and provide a mold.

[0004] The utility model provides the following technical solutions:

[0005] An embodiment of the present application provides a mold, including a mold body and a flow blocking block. An injection cavity is arranged inside the mold body, and a feeding port is arranged on the mold body. The melt enters the injection cavity through the feeding port; the flow blocking block is arranged at the feeding port, and there is a gap between the flow blocking block and the inner wall of the feeding port. The flow blocking block is used to slow down the flow of the melt at the feeding port.

[0006] In one embodiment, the flow blocking block is a rhombic block structure.

[0007] In one embodiment, on the flow blocking block, a cross-section parallel to the end face of the flow blocking block is a first cross-section, the first cross-section is a rhombic cross-section, and the lengths of the diagonals of the first cross-section are 8 mm.

[0008] In one embodiment, the flow blocking block is a pentagonal prism structure.

[0009] In one embodiment, on the flow blocking block, a cross-section parallel to the end face of the flow blocking block is a second cross-section, the second cross-section is a regular pentagonal cross-section, and the diameter of the circumscribed circle of the second cross-section is equal to 8 mm.

[0010] In one embodiment, the flow blocking block is a regular N-sided block structure, where N≥6.

[0011] In one embodiment, on the flow blocking block, a cross-section parallel to the end face of the flow blocking block is a third cross-section, the third cross-section is a regular N-sided cross-section, and the diameter of the circumscribed circle of the third cross-section is equal to 8 mm.

[0012] In one embodiment, the flow blocking block is a cylindrical block structure.

[0013] In one embodiment, the diameter of the flow blocking block is 8 mm.

[0014] In one embodiment, the distance between the end face of the flow blocking block and the parting surface is A, where A ≥ 1 mm.

[0015] The embodiments of the present utility model have the following advantages:

[0016] By adding a flow blocking block at the feed inlet, the speed of the melt passing through the feed inlet is reduced by means of physical speed reduction, while the overall injection speed of the injection machine remains unchanged. Under the environment of lower mold temperature and uniform injection speed, qualified products can be produced. The setting of the flow blocking block makes the flow of the melt in the injection cavity more uniform, which helps to eliminate defects such as uneven filling, sink marks, and air bubbles caused by uneven flow velocity, and improves the overall consistency and qualification rate of the products. Although the flow blocking block reduces the flow velocity of the melt at the feed inlet to a certain extent, the injection speed of the injection machine remains unchanged, and by optimizing the flow state of the melt in the injection cavity, the injection cycle can be shortened and the production efficiency can be improved.

[0017] In order to make the above objects, features, and advantages of the present utility model more obvious and understandable, the following specifically gives preferred embodiments and, in conjunction with the accompanying drawings, makes the following detailed description. Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present utility model, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0019] Figure 1 It is a schematic structural diagram of a first perspective of Product 1 made through one of the embodiments of the present application;

[0020] Figure 2 It is a schematic structural diagram of a second perspective of Product 1 made through one of the embodiments of the present application;

[0021] Figure 3 It is a schematic structural diagram of a third perspective of Product 2 made through another embodiment of the present application;

[0022] Figure 4 It is a schematic structural diagram of a fourth perspective of Product 2 made through another embodiment of the present application.

[0023] Main Element Symbol Description:

[0024] 100 - Product One; 150 - diamond - shaped hole;

[0025] 200 - Product Two; 250 - cylindrical hole. Detailed implementation manners

[0026] The embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present utility model and should not be construed as limiting the present utility model.

[0027] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. On the contrary, when an element is referred to as being "directly on" another element, there is no intermediate element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration.

[0028] In the present utility model, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected", "fixed" and other terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0029] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality of" means two or more unless otherwise specifically defined.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used in the description of the template herein are only for the purpose of describing specific embodiments and are not intended to limit the present utility model. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0031] Figures 1 to 4 Products made using the mold provided by the embodiments of the present application, wherein, as Figure 1 and Figure 2 are products 100 made using the mold of one of the embodiments provided by the present application, Figure 3 and Figure 4 are products 200 made using the mold of another embodiment provided by the present application.

[0032] Embodiments of the present application provide a mold. Products made using the mold provided by the embodiments of the present application can avoid problems such as whitening or uneven color near the mold feed port on the product, especially for products made of PC / ABS materials. PC / ABS refers to a modified engineering plastic blended from polycarbonate (abbreviated as PC) and acrylonitrile-butadiene-styrene (abbreviated as ABS). This material combines the excellent characteristics of both PC and ABS materials and has a wide range of application fields. Of course, the embodiments provided by the present application can also be applied to the production of products made of other materials, which will not be elaborated here.

[0033] The mold includes a mold body and a flow-blocking block. An injection cavity is provided inside the mold body, and a feed port is provided on the mold body. The injection cavity communicates with the external space through the feed port. Exemplarily, the injection molding machine melts the material to form a melt, injects the melt into the feed port of the mold, and then the injection molding machine continuously pressurizes the melt to make the melt enter the injection cavity from the feed port of the mold and spread in the injection cavity.

[0034] The flow-blocking block is arranged at the feed port, and there is a gap between the flow-blocking block and the inner wall of the feed port. The melt enters the injection cavity of the mold through this gap. The flow-blocking block is used to slow down the flow of the melt at the feed port, thereby reducing the flow rate of the melt. By adding a flow-blocking block at the feed port and reducing the speed of the melt passing through the feed port by physical speed reduction, while the overall injection speed of the injection molding machine remains unchanged, qualified products can be produced under the conditions of lower mold temperature and uniform injection speed.

[0035] The setting of the flow-blocking block makes the flow of the melt in the injection cavity more uniform, helps to eliminate defects such as uneven filling, sink marks, and bubbles caused by uneven flow rate, and avoids problems such as whitening or uneven color near the mold feed port on the product, improving the overall consistency and qualification rate of the product. Although the flow-blocking block reduces the flow rate of the melt at the feed port to a certain extent, the injection speed of the injection molding machine remains unchanged, and by optimizing the flow state of the melt in the injection cavity, the injection molding cycle can be shortened and the production efficiency can be improved.

[0036] Exemplarily, the mold body includes a front mold and a rear mold. The front mold and the rear mold are hermetically fastened to ensure that the high-pressure environment inside the mold is effectively maintained during the injection molding or forming process. The feed inlet is provided on the front mold, and the flow restrictor block is fixedly arranged on the front mold by means of welding, clamping, or integral molding. In another embodiment, the feed inlet is provided on the rear mold, and the flow restrictor block is fixedly arranged on the rear mold by means of welding, clamping, or integral molding.

[0037] In another embodiment, a part of the inner wall of the feed inlet is provided on the front mold, and another part of the inner wall of the feed inlet is provided on the rear mold. After the front mold and the rear mold are fastened together, the feed inlet is formed. The flow restrictor block is fixedly arranged on the front mold by means of welding, clamping, or integral molding. In another embodiment, the flow restrictor block is fixedly arranged on the rear mold by means of welding, clamping, or integral molding.

[0038] The composition of the mold body is not limited to the simple combination of the front mold and the rear mold. In practical applications, according to the improvement of product complexity and the requirements of production efficiency, the mold design is often more diversified. For example, in certain specific scenarios, the mold body may also include a left mold and a right mold, which form a more enclosed molding space through four-way enclosure, further improving the sealing performance and molding accuracy of the mold. It should be understood that the mold body may be set in different shapes due to production needs, including various shapes such as circular and polygonal. As long as the feed inlet of the mold is provided with a flow restrictor block, it shall be considered within the protection scope of this application.

[0039] In one embodiment, the flow restrictor block is a rhombic block structure.

[0040] In one embodiment, on the flow restrictor block, the cross-section parallel to the end face of the flow restrictor block is the first cross-section, and the first cross-section is a rhombic cross-section. The lengths of the diagonals of the first cross-section are 8 mm.

[0041] The flow restrictor block with a rhombic cross-section can more flexibly guide the fluid flow, reducing the turbulence and vortex phenomena during the flow process. In fluid dynamics, the rhombic structure can prompt the fluid to flow along a specific path, thereby reducing energy loss and improving fluid efficiency.

[0042] The flow restrictor block is a rhombic block structure, and the rhombic structure has good stability and load-bearing capacity in mechanics. When the flow restrictor block bears pressure or impact, the rhombic cross-section can more effectively disperse and resist external forces, reducing the risk of structural deformation and damage.

[0043] As Figure 1 and Figure 2 shown, on product 100, there is a rhombic hole 150 left after the melt is blocked by the flow restrictor block. The cross-section of the rhombic hole 150 parallel to the first cross-section is also a rhombic cross-section, and the length of the diagonal of this cross-section is D 1 , where D 1 = 8 mm.

[0044] As shown Figure 1 and Figure 2 in the figure, Product 1 is a plate structure, and Product 1 and the stump formed at the glue inlet are divided into two at the diamond-shaped hole. Of course, setting Product 1 as a plate structure is only an example, and Product 1 can also be set into other shapes, such as an arc-shaped plate, etc. Figure 2 and Figure 4 the arrows shown in the figure are the melt flow directions. In Figure 2 and Figure 4 the figure, the flow direction of the melt in the mold is intuitively marked by the arrows. These arrows reveal the flow trajectory of the melt under the action of the flow blocking block and the key role played by the flow blocking block in guiding the melt flow and optimizing the filling efficiency. The melt flows smoothly and efficiently along the established path and finally forms Product 100 with a dense structure and uniform color at the feed port without whitening in the injection cavity of the mold.

[0045] In one embodiment, the flow blocking block is a pentagonal prism structure.

[0046] In one embodiment, on the flow blocking block, the cross-section parallel to the end face of the flow blocking block is the second cross-section, and the second cross-section is a regular pentagon cross-section, and the diameter of its circumscribed circle is equal to 8 mm.

[0047] The cross-sectional shape of the regular pentagon and the precise diameter of the circumscribed circle help to more precisely control the flow direction and speed of the fluid. By optimizing the geometric shape of the cross-section, the turbulence and eddy current phenomena of the fluid when passing through the flow blocking block can be reduced, thereby improving the stability and controllability of the fluid flow.

[0048] The pentagonal prism structure has better bending and torsion resistance than the triangular prism shape in certain directions. The cross-sectional shape of the regular pentagon further enhances the structural strength of the flow blocking block, enabling it to withstand greater fluid pressure and mechanical stress and extending the service life of the equipment.

[0049] This enhanced structural strength enables the pentagonal prism-shaped flow blocking block to better cope with complex and changeable fluid environments and withstand greater fluid pressure and mechanical stress. In the long-term use process, this advantage will be translated into a longer equipment service life and lower maintenance costs, bringing real economic benefits to users. And setting the flow blocking block as a pentagonal prism structure can also save manufacturing materials and reduce manufacturing costs.

[0050] In one embodiment, the flow blocking block is a regular N-sided block structure, where N≥6.

[0051] In one embodiment, on the flow-blocking block, the cross-section parallel to the end face of the flow-blocking block is the third cross-section, and the third cross-section is a regular N-sided polygon cross-section, and the diameter of its circumscribed circle is equal to 8 mm. The selection of this size is based on in-depth research on hydrodynamic characteristics and comprehensive consideration of mold processing accuracy, aiming to ensure that the flow-blocking block can achieve the best fluid diversion effect while ensuring structural strength.

[0052] To illustrate this technical solution more specifically, we can give two examples. First, when N is equal to 6, the flow-blocking block presents a hexagonal prism structure, and its third cross-section is a hexagonal cross-section. The diameter of the circumscribed circle of this hexagonal cross-section is exactly 8 mm. Such a design enables the flow-blocking block to maintain a stable fluid channel during the diversion process, while reducing the formation of fluid turbulence and vortices. In another embodiment, N is set to 10. At this time, the flow-blocking block transforms into a decagonal prism structure, and its third cross-section correspondingly becomes a decagonal cross-section, still maintaining the circumscribed circle diameter of 8 mm. This expansion of polygons not only increases the design diversity but also further improves the adaptability and control accuracy of the flow-blocking block in complex fluid environments.

[0053] By designing the flow-blocking block as a regular N-sided polygon block structure and strictly controlling the diameter of the circumscribed circle of its third cross-section, the flow-blocking block becomes a stable and efficient fluid control element. It not only improves the overall performance of the mold but also provides strong support for the optimization of the injection molding process and the improvement of product quality.

[0054] In one embodiment, the flow-blocking block diverts the melt through one of its side edges. For example, when the flow-blocking block is a rhombic block structure, the flow-blocking block has four side edges and four side walls, and one of the side edges is closer to the outside of the feed port compared to the other side edges and side walls. During the melt flow process, the melt will first contact this side edge of the flow-blocking block, and this side edge can divert the melt, dividing the melt into two parts, and the two parts of the melt flow through both sides of the flow-blocking block respectively to reach the injection cavity.

[0055] By diverting through a specific edge, the direction and distribution of the melt during the flow process can be precisely controlled. It helps to ensure that the melt can be evenly distributed into the injection cavity after flowing through the flow-blocking block, reducing the melt turbulence phenomenon. Since the melt is effectively diverted and guided when flowing through the flow-blocking block, the turbulence and vortex phenomena generated during the flow process are reduced. This not only helps to reduce energy loss but also reduces defects such as bubbles and shrinkage holes caused by turbulence, improving the surface quality and internal performance of the injection molded product.

[0056] In one embodiment, the flow-blocking block is a cylindrical block structure, that is, N is infinite. At this time, the cross-section of the flow-blocking block can be regarded as a continuous circle without obvious edges.

[0057] In one embodiment, the diameter of the flow-blocking block is 8 mm.

[0058] During the flow of fluid or material, the cylindrical flow-block can provide a relatively uniform resistance, which helps to balance the flow rate of the fluid or material and reduce eddy current and turbulence phenomena.

[0059] Compared with flow-blocks with sharp or irregular shapes, the cylindrical design can reduce the impact on the fluid or material, and reduce wear and energy loss.

[0060] By balancing the flow rate of the fluid or material, the cylindrical flow-block helps to reduce product defects caused by uneven flow rates, such as cracks and shrinkage cavities. The stable flow-blocking effect helps to ensure the stability and consistency of product quality and improve the overall quality of the product. With a high degree of standardization, the maintenance and replacement costs of the cylindrical flow-block are relatively low.

[0061] Such as Figure 3 and Figure 4 As shown, on product two 200, there is a cylindrical hole 250 left after the flow-block blocks the melt. The cross-section of the cylindrical hole 250 parallel to the first cross-section is also a circular cross-section, and the diameter of this cross-section is D 2 , where D 2 = 8mm. As Figure 3 and Figure 4 As shown, product two is a plate structure, and product two and the stump formed at the gate solidify and are divided into two at the circular hole. Of course, setting product two as a plate structure is only an example, and product two can also be set into other shapes, such as an arc-shaped plate, a special-shaped plate, etc., which are not limited here.

[0062] Regarding the specific layout of the flow-block, a key parameter cannot be ignored - the distance A between the end face of the flow-block and the parting surface. The setting of this distance is crucial. It not only concerns the smooth progress of the production process, but also guarantees the product quality and the mold life. Specifically, the value of A is set to be not less than 1mm, that is, A ≥ 1mm.

[0063] Exemplarily, A = 1mm.

[0064] In one embodiment, A = 2mm. In another embodiment, A = 3mm. In actual application, the specific value of A can be selected according to the specific engineering situation.

[0065] Ensure that the flow-block does not interfere with or collide with the parting surface during operation, thereby protecting the integrity of the mold and equipment and avoiding damage. This is crucial for ensuring the continuity and stability of the production process.

[0066] By adjusting the size of the spacing A, the resistance of the flow-block to the material flow can be precisely controlled, thereby optimizing the material flow path and speed. This is of great significance for improving product quality and reducing defects. An appropriate spacing can reduce the friction and wear between the flow-block and the parting surface, thus extending the service life of the mold. This has a positive effect on reducing production costs and increasing production efficiency.

[0067] The reasonable spacing A also brings convenience in mold maintenance. It reduces the direct contact between the flow-block and the parting surface, reduces the mold damage caused by friction and wear, thus extending the service life of the mold and reducing production costs. At the same time, this design also provides greater flexibility and space for subsequent production adjustment and optimization, ensuring the stability and reliability of the production process.

[0068] In all the examples shown and described here, any specific value should be construed as merely exemplary, not as a limitation. Therefore, other examples of the exemplary embodiments may have different values.

[0069] It should be noted that like reference numerals and letters refer to like items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0070] The above-described embodiments merely represent several implementation manners of the present utility model. The description thereof is relatively specific and detailed, but should not be construed as a limitation on the scope of the present utility model. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and improvements can still be made, and all of these belong to the protection scope of the present utility model.

Claims

1. A mold, characterized in that: include: A mold body, wherein an injection molding cavity is arranged inside the mold body, and a feed port is arranged on the mold body, and the melt enters the injection molding cavity through the feed port; A baffle block is arranged at the feed port, and there is a gap between the baffle block and the inner wall of the feed port, and the baffle block is used to slow down the flow of the melt at the feed port.

2. The mold according to claim 1, characterized in that: The baffle block is a diamond-shaped block structure.

3. The mold according to claim 2, characterized in that: On the baffle block, a section parallel to the end face of the baffle block is a first section, the first section is a diamond section, and the length of each diagonal line of the first section is 8 mm.

4. The mold according to claim 1, characterized in that: The baffle block is a pentagonal prism structure.

5. The mold according to claim 4, characterized in that: On the baffle block, a section parallel to the end face of the baffle block is a second section, the second section is a regular pentagonal section, and the diameter of the circumscribed circle of the second section is equal to 8 mm.

6. The mold according to claim 1, characterized in that: The baffle block is a regular N-gon block structure, wherein N≥6.

7. The mold according to claim 6, characterized in that: On the baffle block, a section parallel to the end face of the baffle block is a third section, the third section is a regular N-gon section, and the diameter of the circumscribed circle of the third section is equal to 8 mm.

8. The mold according to claim 1, characterized in that: The baffle block is a cylindrical block structure.

9. The mold according to claim 8, characterized in that: The diameter of the baffle is 8 mm.

10. The mold according to any one of claims 1 to 9, characterized in that: The distance between the end face of the baffle block and the parting surface is A, wherein A≥1mm.

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