Plastic injection mold

Abstract

The utility model provides a plastic injection mold. The plastic injection mold comprises a fixing plate, a mold plate and a cooling assembly. Wherein the mold plate comprises a first mold plate and a second mold plate which are attached to each other, the first mold plate is attached to one side of the fixing plate, and a mold cavity is defined between the first mold plate and the second mold plate and used for pouring a model; the cooling assemblies are arranged on the first mold plate and the second mold plate respectively, each cooling assembly comprises a cooling pipe, a water inlet and a water outlet, the water inlets and the water outlets are formed in the mold plates, and the cooling pipes are arranged in the mold plates and communicated with the water inlets and the water outlets. According to the plastic injection mold, the cooling assemblies are arranged on the first mold plate and the second mold plate, so that the whole surface of the mold is covered with more cooling channels. And heat on the surface of the mold can be effectively taken away, so that the mold can be cooled more quickly, and the demolding efficiency and the product quality are improved.

Description

Technical Field

[0001] The present application relates to the field of molds, and in particular to a plastic injection mold. Background Art

[0002] Plastic injection molds are a type of mold commonly used in industrial production to produce various plastic products, such as parts, containers, etc. In the plastic injection molding process, plastic particles are heated and melted and then injected into the mold cavity. After cooling and solidification, the final product is formed. These molds usually consist of a fixed plate and two templates that fit each other. The templates enclose the mold cavity for pouring plastic. In the injection molding process, cooling is crucial, which directly affects the molding quality and production efficiency of the product.

[0003] At present, common plastic injection molds usually have cooling channels in the mold to improve the cooling effect. These cooling channels are connected to the external cooling water system through the water inlet and outlet to achieve circulating cooling. Usually, these cooling channels are arranged inside the mold, close to the mold cavity, and a certain design is used to ensure that the cooling medium can evenly cover the mold cavity surface to achieve an effective cooling effect.

[0004] However, the traditional cooling channel arrangement still has some defects. For example, the cooling channel is arranged inside the mold plate, and the problem of uneven cooling is particularly prominent, which makes the plastic mold easily deformed, has a low yield rate, and increases the cost. Therefore, a new plastic injection mold structure is needed to solve the problems existing in the prior art and improve demoulding efficiency and product quality. Utility Model Content

[0005] In view of this, it is necessary to provide a plastic injection mold that can better demould and increase the yield rate to solve the above problems.

[0006] An embodiment of the present application provides a plastic injection mold, comprising:

[0007] Fixed plate;

[0008] The template includes a first template and a second template attached to each other, wherein the first template is attached to one side of the fixed plate, and a mold cavity is enclosed between the first template and the second template for casting the model;

[0009] A cooling component is respectively arranged on the first template and the second template, and the cooling component includes a cooling pipe, a water inlet and a water outlet. The water inlet and the water outlet are both arranged on the template, and the cooling pipe is arranged in the template and is connected with the water inlet and the water outlet.

[0010] In at least one embodiment of the present application, when observed along the vertical direction, the projected area of ​​the cooling pipe is defined as A, and the projected area of ​​the mold cavity is defined as B, and 2A≥B.

[0011] In at least one embodiment of the present application, two cooling components are provided on each of the first template and the second template, and the two cooling components are symmetrically arranged along the center line of the template in the horizontal direction.

[0012] In at least one embodiment of the present application, the fixed plate further includes a positioning ring and a nozzle, the positioning ring is disposed on the fixed plate, the nozzle is fixed on the positioning ring, an injection hole is opened at the center axis of the nozzle, and the injection hole is communicated with the mold cavity.

[0013] In at least one embodiment of the present application, a diameter of the injection hole at one end close to the fixing plate is smaller than a diameter of the injection hole at one end close to the mold cavity.

[0014] In at least one embodiment of the present application, the template further includes a positioning block, the positioning block includes a first part and a second part, the first part is arranged on the first template, the second part is arranged on the second template, and the first part is snap-connected with the second part.

[0015] In at least one embodiment of the present application, the template further includes four positioning columns, which are respectively disposed at four corners of the fixing plate and penetrate the first template and the second template.

[0016] In at least one embodiment of the present application, the plastic injection mold also includes an ejector assembly, which includes a mold foot, a closing plate and a plurality of ejector pins, wherein one end of the mold foot is disposed on the closing plate and the other end is disposed on the template, one end of the ejector pin is fixed to the closing plate and the other end extends into the template to abut against the second template.

[0017] In at least one embodiment of the present application, the ejection assembly further includes an elastic member, one end of which is disposed on the mold foot, and the other end of which abuts against the mold plate, for restoring the plastic injection mold to an initial state.

[0018] In at least one embodiment of the present application, the inner surface of the mold cavity is provided with a heat absorbing coating.

[0019] The above-mentioned plastic injection mold is provided with cooling components on both the first and second mold plates, so that the overall surface of the mold is covered with more cooling channels. The heat on the mold surface can be effectively taken away, so that the mold can be cooled more quickly. The two cooling components can also make the mold cool more evenly, which helps to reduce the temperature gradient, avoid mold deformation or defects caused by local temperature differences, and improve demoulding efficiency and product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional diagram of a plastic injection mold in one embodiment of the present application.

[0021] Figure 2 for Figure 1 A three-dimensional exploded view of the plastic injection mold.

[0022] Figure 3 for Figure 1 A top cross-sectional view of a plastic injection mold.

[0023] Figure 4 for Figure 1 A front cross-sectional view of a plastic injection mold.

[0024] Figure 5 for Figure 1 A side cross-sectional view of a plastic injection mold.

[0025] Main component symbols

[0026] 100. A plastic injection mold; 10. A fixing plate; 11. A positioning ring; 12. A nozzle; 12a. An injection hole; 20. A mold plate; 21. A first mold plate; 22. A second mold plate; 23. A mold cavity; 24. A positioning block; 241. A first portion; 242. A second portion; 25. A positioning column; 30. A cooling assembly; 31. A cooling pipe; 32. A water inlet; 33. A water outlet; 40. An ejector assembly; 41. A mold foot; 42. A closing plate; 43. An ejector pin; 44. An elastic member. DETAILED DESCRIPTION

[0027] The embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0028] It should be noted that when a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a central component at the same time. When a component is considered to be "located on" another component, it may be directly located on the other component or there may be a central component at the same time. The terms "top", "bottom", "upper", "lower", "left", "right", "front", "back", and similar expressions used herein are for illustrative purposes only.

[0029] An embodiment of the present application provides a plastic injection mold, comprising:

[0030] Fixed plate;

[0031] The template includes a first template and a second template attached to each other, wherein the first template is attached to one side of the fixed plate, and a mold cavity is enclosed between the first template and the second template for casting the model;

[0032] A cooling component is respectively arranged on the first template and the second template, and the cooling component includes a cooling pipe, a water inlet and a water outlet. The water inlet and the water outlet are both arranged on the template, and the cooling pipe is arranged in the template and is connected with the water inlet and the water outlet.

[0033] The above-mentioned plastic injection mold is provided with cooling components on both the first and second mold plates, so that the overall surface of the mold is covered with more cooling channels. The heat on the mold surface can be effectively taken away, so that the mold can be cooled more quickly. The two cooling components can also make the mold cool more evenly, which helps to reduce the temperature gradient, avoid mold deformation or defects caused by local temperature differences, and improve demoulding efficiency and product quality.

[0034] Some embodiments of the present application are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0035] See also Figure 1-Figure 5 An embodiment of the present application provides a plastic injection mold 100 , including a fixing plate 10 , a mold plate 20 , and a cooling assembly 30 .

[0036] Among them, the template 20 includes a first template 21 and a second template 22 that are fitted to each other, the first template 21 is fitted to one side of the fixed plate 10, and a mold cavity 23 is enclosed between the first template 21 and the second template 22 for casting the model; the cooling component 30 is respectively arranged on the first template 21 and the second template 22, and the cooling component 30 includes a cooling pipe 31, a water inlet 32 ​​and a water outlet 33, the water inlet 32 ​​and the water outlet 33 are both arranged on the template 20, and the cooling pipe 31 is arranged in the template 20 and is connected with the water inlet 32 ​​and the water outlet 33.

[0037] Specifically, the fixed plate 10 is a basic component of the plastic injection mold, and its main function is to provide stable support for the entire mold and bear the pressure and force during the injection process. By setting the fixed plate 10, it can be ensured that the mold remains stable during the injection process to prevent deformation or displacement, thereby ensuring the accuracy and quality of the product. The first template 21 and the second template 22 are attached to each other to enclose a mold cavity 23 for casting the model. The first template 21 is attached to one side of the fixed plate 10, and the second template 22 is attached to the first template 21 to form a mold cavity 23. This structural design enables the mold to accurately shape the product shape, and at the same time, it can easily remove the finished product, thereby improving production efficiency.

[0038] Furthermore, the cooling assembly 30 is respectively arranged on the first mold plate 21 and the second mold plate 22, and includes a cooling pipe 31, a water inlet 32 ​​and a water outlet 33, which is used to control the mold temperature and accelerate the cooling speed of the product. By setting the cooling assembly 30, the temperature of the plastic injection mold can be effectively reduced, the product molding cycle can be reduced, and the production efficiency and product quality can be improved.

[0039] During the injection process, plastic is injected into the mold cavity 23 and cooled and hardened in the mold to form the desired product shape. The cooling pipe 31 in the cooling assembly 30 reduces the temperature of the mold by circulating the cooling medium. The water inlet 32 ​​and the water outlet 33 allow the cooling medium to effectively enter and exit the cooling pipe 31 to achieve circulating cooling. The stable support of the fixed plate 10 ensures the stability and accuracy of the mold during the entire injection process. The fitting structure of the first template 21 and the second template 22 and the design of the mold cavity 23 ensure the accurate molding of the product.

[0040] In summary, by providing cooling components 30 on both the first and second templates 22, the overall surface area of ​​the mold covers more cooling channels, which can effectively remove the heat from the mold surface, allowing the mold to cool down more quickly. The two cooling components 30 can also cool the mold more evenly, which helps to reduce the temperature gradient, avoid mold deformation or defects caused by local temperature differences, and improve demoulding efficiency and product quality.

[0041] In a specific embodiment, when observed along the vertical direction, the projection area of ​​the cooling tube 31 is defined as A, and the projection area of ​​the mold cavity 23 is defined as B, and 2A≥B.

[0042] Specifically, the cooling pipe 31 is responsible for circulating a cooling medium, such as water or other cooling medium, in the injection mold to reduce the mold temperature and promote rapid cooling and hardening of the plastic product. By setting the cooling pipe 31, the mold temperature can be effectively controlled, the product molding cycle can be reduced, and the production efficiency and product quality can be improved. The projection area of ​​the mold cavity 23 refers to the projection area of ​​the mold cavity 23 in the vertical direction, which is the effective area for the product to be molded in the injection mold. The projection area of ​​the mold cavity 23 directly affects the effect and quality of product molding. A sufficient projection area can ensure the complete molding of the product during the injection process.

[0043] Furthermore, the inequality relationship requires that twice the projected area of ​​the cooling tube 31 is at least equal to or greater than the projected area of ​​the mold cavity 23. This relationship ensures that the coverage area of ​​the cooling tube 31 can fully cover the entire effective area of ​​the mold cavity 23, thereby ensuring uniform cooling inside the mold, preventing deformation or stress concentration, and improving the molding accuracy and quality of the product.

[0044] Furthermore, when the injection mold is working, the cooling medium flowing in the cooling pipe 31 cools the plastic in the mold cavity 23 by circulating back and forth, accelerating the cooling and hardening process of the product. Since the coverage area of ​​the cooling pipe 31 is at least twice the projected area of ​​the mold cavity 23, it is ensured that the cooling effect can fully cover the entire mold cavity 23, thereby preventing possible hot spots and uneven cooling, and improving the molding quality and surface finish of the product.

[0045] In a specific embodiment, two cooling components 30 are disposed on each of the first template 21 and the second template 22 , and the two cooling components 30 are symmetrically arranged along the center line of the template 20 in the horizontal direction.

[0046] Specifically, two cooling components 30 are respectively arranged on the two sides of the mold to uniformly cool the plastic material in the mold cavity 23 on both sides of the mold to accelerate the cooling and hardening process of the product. By uniformly arranging the cooling components 30 on both sides of the mold, it is possible to ensure that the plastic material in the mold cavity 23 is uniformly cooled, and the situation of excessive temperature gradient is prevented, thereby avoiding possible product deformation or internal stress concentration, and improving the molding quality and stability of the product.

[0047] Furthermore, the cooling assembly 30 is arranged horizontally with the center line of the template 20 as the symmetry axis, which can ensure that the cooling effect of the mold is uniform in the horizontal direction. The symmetrical arrangement can make the cooling effect on both sides of the mold uniform, avoiding the problem of product deformation or unstable quality caused by uneven cooling, and improving the molding accuracy and surface quality of the product.

[0048] In a specific embodiment, the fixing plate 10 further includes a positioning ring 11 and a nozzle 12. The positioning ring 11 is arranged on the fixing plate 10. The nozzle 12 is fixed on the positioning ring 11. An injection hole 12a is opened at the central axis of the nozzle 12. The injection hole 12a is connected to the mold cavity 23.

[0049] Specifically, the positioning ring 11 is arranged on the fixing plate 10, mainly used to ensure the accurate position of the nozzle 12, so that the nozzle 12 can be accurately aligned with the mold cavity 23. The presence of the positioning ring 11 can ensure the stable position of the nozzle 12, avoid the problem of uneven injection of the mold cavity 23 or inaccurate product size due to the inaccurate position of the nozzle 12, and improve the molding accuracy and quality of the product. The nozzle 12 is an important component in the plastic injection mold, which is responsible for injecting the plastic material into the mold cavity 23 to form the shape of the product. The setting of the nozzle 12 allows the plastic material to be accurately injected into the mold cavity 23, ensuring the accuracy and integrity of the product molding.

[0050] Furthermore, the injection hole 12a is a channel opened at the center axis of the nozzle 12, which is used to transport the plastic material from the nozzle 12 to the mold cavity 23. The injection hole 12a is connected to the mold cavity 23, ensuring that the plastic material can flow smoothly into the mold cavity 23, thereby ensuring smooth product molding.

[0051] In a specific embodiment, the diameter of the injection hole 12a at one end close to the fixing plate 10 is smaller than the diameter at one end close to the mold cavity 23 .

[0052] Specifically, by making the diameter of the injection hole 12a vary along its length, an asymmetric diameter design is achieved. This design can adjust the flow rate and pressure of the plastic material before it is injected into the mold cavity 23, thereby optimizing the injection process of the plastic material. The smaller diameter at one end limits the flow rate of the plastic material and increases the pressure of the fluid. During the plastic injection process, this restriction helps to increase the flow pressure and speed of the plastic material, thereby making it easier for it to enter the mold cavity 23.

[0053] Furthermore, the larger diameter is conducive to the plastic material filling the entire mold cavity 23 faster and more evenly when entering the mold cavity 23. This design ensures the smooth flow of the plastic material when injected into the mold cavity 23, thereby ensuring the integrity and quality of the product molding. When the plastic injection mold is working, the plastic material enters the mold cavity 23 through the injection hole 12a. The smaller diameter at one end of the injection hole 12a limits the flow rate of the plastic material and increases the pressure of the fluid, which helps to push the plastic material into the mold cavity 23. The larger diameter of the injection hole 12a near one end of the mold cavity 23 helps to ensure that the plastic material fills the entire mold cavity 23 more evenly, thereby improving the molding accuracy and quality of the product.

[0054] In a specific embodiment, the template 20 also includes a positioning block 24, and the positioning block 24 includes a first part 241 and a second part 242, the first part 241 is arranged on the first template 21, the second part 242 is arranged on the second template 22, and the first part 241 and the second part 242 are snap-connected.

[0055] Specifically, the positioning block 24 is used to ensure the accurate alignment and connection of the first template 21 and the second template 22 during assembly, so as to ensure the accuracy and stability of the mold cavity 23. The presence of the positioning block 24 can ensure the correct relative position between the templates 20, avoid errors in the assembly process, and improve the assembly accuracy and stability of the mold. The first part 241 positioning block 24 is set on the first template 21, and the second part 242 positioning block 24 is set on the second template 22, which are respectively used for the alignment of the templates 20. By setting the positioning block 24 on each template 20, it can be ensured that when assembling the mold, the first template 21 and the second template 22 can be accurately aligned, so that the structure and size of the mold cavity 23 remain consistent, thereby improving the molding accuracy and quality of the product.

[0056] Furthermore, the first part 241 and the second part 242 of the positioning block 24 are connected by a snap-fit ​​connection, so that the two parts can be firmly connected together. The snap-fit ​​connection ensures the firm connection between the positioning blocks 24, so that the relative position between the templates 20 does not change, thereby ensuring the stability and consistency of the mold cavity 23.

[0057] In a specific embodiment, the template 20 further includes four positioning posts 25 . The four positioning posts 25 are respectively disposed at four corners of the fixing plate 10 and penetrate the first template 21 and the second template 22 .

[0058] Specifically, the positioning posts 25 are used to ensure accurate alignment and stable connection between the first template 21 and the second template 22 during assembly, so as to ensure the accuracy and stability of the mold cavity 23. The arrangement of the positioning posts 25 can ensure the correct relative position between the templates 20, avoid errors during assembly, and improve the assembly accuracy and stability of the mold. Four positioning posts 25 are respectively arranged at the four corners of the fixed plate 10 to provide accurate positioning in four directions.

[0059] Furthermore, by setting up four positioning posts 25, the first template 21 and the second template 22 can be accurately aligned in all directions, so that the structure and size of the mold cavity 23 remain consistent, and the molding accuracy and quality of the product are improved. The positioning posts 25 penetrate the first template 21 and the second template 22, so that they can be fixed to each other and maintain a stable connection during assembly. The penetration setting of the positioning posts 25 ensures a firm connection between the first template 21 and the second template 22, thereby ensuring the stability and consistency of the mold cavity 23.

[0060] In a specific embodiment, the plastic injection mold also includes an ejector assembly 40, which includes a mold foot 41, a closing plate 42 and a plurality of ejector pins 43. One end of the mold foot 41 is arranged on the closing plate 42, and the other end is arranged on the template 20. One end of the ejector pin 43 is fixed on the closing plate 42, and the other end extends into the template 20 to abut against the second template 22.

[0061] Specifically, the mold foot 41 is the main part of the ejection assembly 40, which is responsible for pushing the product out of the mold during the molding process. The setting of the mold foot 41 enables the molded product to be smoothly ejected from the mold, thereby realizing the product demolding operation after the mold is opened and closed, ensuring the continuity and efficiency of production. The sealing plate 42 serves as the supporting part of the ejection assembly 40 and is used to support and fix the ejector pin 43.

[0062] Furthermore, the setting of the sealing plate 42 ensures the structural stability of the ejector assembly 40, and at the same time serves as a support point for fixing the ejector pin 43, so that the ejector pin 43 can accurately apply thrust to help eject the product smoothly from the mold. The ejector pin 43 is a key part of the ejector assembly 40, responsible for ejecting the product from the mold. The design of the ejector pin 43 extending into the template 20 and contacting the second template 22 ensures that the molded product can be accurately ejected from the mold when the mold is opened and closed, thereby ensuring the molding integrity and quality of the product.

[0063] In a specific embodiment, the ejection assembly 40 further includes an elastic member 44 , one end of which is disposed on the mold foot 41 , and the other end of which abuts against the mold plate 20 , so as to restore the plastic injection mold to an initial state.

[0064] Specifically, the elastic member 44 is designed to provide elastic support and resilience to restore the plastic injection mold to its initial state. By setting the elastic member 44, a certain elastic support can be generated between the mold foot 41 and the mold plate 20, so that after the pressure in the mold cavity 23 is released, the ejector assembly 40 can quickly return to its original position to prepare for the next injection molding process. One end of the elastic member 44 is connected to the mold foot 41, ensuring that the elastic member 44 can move with the movement of the mold foot 41.

[0065] Furthermore, by connecting with the mold foot 41, the elastic member 44 can maintain a relative position when the mold foot 41 moves, thereby ensuring the normal operation of the ejector assembly 40. The other end of the elastic member 44 abuts against the template 20 to restore the mold to its initial state. When the elastic member 44 abuts against the template 20, it can exert a certain resilience on the template 20, so that the template 20 can quickly return to its original position after the pressure is released, ensuring the stability and reliability of the mold.

[0066] In a specific embodiment, the inner surface of the mold cavity 23 is provided with a heat absorbing coating.

[0067] Specifically, the heat absorbing coating can effectively transfer the heat absorbed in the mold cavity 23 to the cooling assembly 30. By transferring the heat to the cooling assembly 30, the cooling process can be accelerated, the cooling time of the plastic material can be reduced, thereby shortening the production cycle and improving production efficiency.

[0068] When the plastic material enters the mold cavity 23 and is filled, the heat absorbing coating in the mold cavity 23 absorbs heat and then transfers this heat to the area in contact with the cooling component 30. The cooling component 30 quickly absorbs this heat and takes the heat away through the cooling medium in the cooling pipe 31. The rapid cooling process quickly solidifies the plastic material, reduces the molding cycle, and improves production efficiency.

[0069] The above is only an implementation method of the present application. It should be pointed out that a person skilled in the art can make improvements without departing from the inventive concept of the present application, but these improvements are within the scope of protection of the present application.

Claims

1. A plastic injection mold, characterized in that: include: Fixed plate; The template includes a first template and a second template attached to each other, wherein the first template is attached to one side of the fixed plate, and a mold cavity is enclosed between the first template and the second template for casting the model; A cooling component is respectively arranged on the first template and the second template, and the cooling component includes a cooling pipe, a water inlet and a water outlet. The water inlet and the water outlet are both arranged on the template, and the cooling pipe is arranged in the template and is connected with the water inlet and the water outlet.

2. A plastic injection mold according to claim 1, characterized in that: Observing along the vertical direction, the projection area of ​​the cooling pipe is defined as A, and the projection area of ​​the mold cavity is defined as B, 2A≥B.

3. A plastic injection mold according to claim 2, characterized in that: Two cooling components are provided on each of the first template and the second template, and the two cooling components are symmetrically arranged along the center line of the template in the horizontal direction.

4. A plastic injection mold according to claim 1, characterized in that: The fixing plate further comprises a positioning ring and a nozzle. The positioning ring is arranged on the fixing plate. The nozzle is fixed on the positioning ring. An injection hole is arranged at the center axis of the nozzle. The injection hole is communicated with the mold cavity.

5. A plastic injection mold according to claim 4, characterized in that: The diameter of the injection hole at one end close to the fixing plate is smaller than the diameter of the injection hole at one end close to the mold cavity.

6. A plastic injection mold according to claim 1, characterized in that: The template also includes a positioning block, which includes a first part and a second part. The first part is arranged on the first template, and the second part is arranged on the second template. The first part is engaged with the second part.

7. A plastic injection mold according to claim 1, characterized in that: The template further includes four positioning columns, which are respectively arranged at four corners of the fixing plate and pass through the first template and the second template.

8. A plastic injection mold according to claim 1, characterized in that: The plastic injection mold also includes an ejector assembly, which includes a mold foot, a closing plate and a plurality of ejector pins. One end of the mold foot is arranged on the closing plate, and the other end is arranged on the template. One end of the ejector pin is fixed to the closing plate, and the other end extends into the template to abut against the second template.

9. A plastic injection mold according to claim 8, characterized in that: The ejection assembly also includes an elastic member, one end of which is arranged on the mold foot and the other end of which abuts against the mold plate, so as to restore the plastic injection mold to an initial state.

10. A plastic injection mold according to claim 1, characterized in that: The inner surface of the mold cavity is provided with a heat absorbing coating.

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