Die capable of reducing surface defects of product
By setting up a heating plate and cooling pipe system in the mold, the problem of surface defects of injection molded products is solved, uniform cooling and fluidity control of the fluid are achieved, and the formation of surface defects is reduced.
Patent Information
- Application Number
- CN202422620705.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-29
- Publication Date
- 2025-09-16
- Estimated Expiration
- 2034-10-29
AI Technical Summary
Injection molded products often have defects such as dark spots, gloss differences, fogging areas and surface wrinkles on the surface, which are particularly obvious when injecting high-viscosity, low-fluidity materials. In addition, incomplete cleaning of traditional molds leads to air bubbles and temperature differences.
A heating plate and cooling pipe system is set up in the mold. The heating plate is used to preheat the cavity to evaporate moisture and ensure fluid fluidity, and the cooling pipe is used to reduce the fluid temperature difference and prevent the formation of surface defects.
It effectively reduces bubbles, dark spots, wrinkles and gloss differences on the product surface, and improves the gloss uniformity and fluidity of the product surface.
Smart Images
Figure CN223339955U_ABST
Abstract
Description
Technical Field
[0001] The utility model specifically relates to the technical field of reducing product surface defects, in particular to a mold capable of reducing product surface defects. Background Art
[0002] Visible defects on the surface of injection molded parts include dark spots, gloss differences or hazy areas, and surface wrinkling or "orange peel." These defects typically occur near the gate or behind sharp corners away from the gate. Dark spots appear near the gate, resembling a dim halo, and are particularly noticeable when producing parts made of high-viscosity, low-flow materials such as PC, PMMA, or ABS. These visible defects can occur when the cooled surface layer of resin is entrained by the core-flowing resin. Even when the injection speed of the melt is constant as it enters the mold, its flow rate can vary. The melt flow rate is high upon entering the mold gate area, but begins to decrease after entering the mold cavity, during the filling phase. This change in the melt flow rate at the front of the melt flow can cause surface defects. Dark spots can occur not only at the gate but also often behind sharp corners. For example, the surface of a sharp corner is generally very smooth, but behind it is very gray and rough. This is also caused by sliding when the cooled surface layer is replaced by the internal fluid due to excessive flow and injection speed.
[0003] Before injection molding, traditional injection molds need to be cleaned by air guns to clean the cavity inside the mold. However, there is a large amount of moisture in the compressed air. When pouring, bubbles will be generated between the fluid and the moisture when flowing inside the mold, which will cause dark spots or defects on the surface of the product. When pouring, there is a temperature difference between the fluid inside the casting cavity, so there is a gloss difference on the surface of the product during pouring. Therefore, in order to address the above defects, we provide a mold that can reduce surface defects of the product. In this device, a heating plate is provided at the bottom of the injection mold. After the wall is cleaned, the cavity is cleaned by the heating coil in the heating plate. The interior of the body is preheated, and the moisture inside the cavity can be evaporated, which effectively ensures that bubbles or defects are generated on the surface of the product during casting; a first cooling pipe is provided inside the cooling injection mold and a circulating water pipe is provided inside the cooling injection plate to realize cooling treatment of the fluid, so that when casting, the temperature difference between the fluids is reduced by the first cooling pipe and the circulating water pipe, which effectively reduces the gloss difference on the surface of the product. When casting, the heating of the heating plate can effectively ensure the fluidity of the fluid, prevent the fluid on the surface from forming a cooling layer, but the internal fluid is still flowing, causing dark spots or wrinkles. Utility Model Content
[0004] The purpose of the utility model is to provide a mold that can reduce surface defects of products. In this device, the cavity is preheated by a heating plate to prevent bubbles or defects in the product. The temperature difference between the fluids is reduced by cooling the first cooling pipe in the injection mold and the circulating water pipe in the cooling injection plate, effectively preventing the gloss difference of the product; so as to solve the problems raised in the background technology.
[0005] To achieve the above objectives, the present invention provides the following technical solutions:
[0006] A mold capable of reducing product surface defects comprises a cooling injection mold; a first cooling pipe is provided inside the cooling injection mold; a connecting valve is provided at the end of the first cooling pipe; a plurality of guide pillars are provided at the bottom of the cooling injection mold; a cooling injection molding plate is provided below the cooling injection mold; holes are provided on the cooling injection molding plate that cooperate with the guide pillars; and the cooling injection molding plate is also provided with guide pillars.
[0007] As a further technical solution of the present invention, a circulating water pipe is provided inside the cooling injection molding plate; and a heating plate is provided on the side of the cooling injection molding plate away from the cooling injection mold.
[0008] As a further technical solution of the present invention, a heating coil is provided inside the heating plate.
[0009] As a further technical solution of the present invention, the heating plate is fixedly connected to the base at a side away from the cooling injection molding plate; a top column is provided between the heating plate and the base.
[0010] As a further technical solution of the present invention, an injection mold is provided on the cooling injection plate; a flow guide frame is provided above the injection mold; and a flow channel is provided inside the flow guide frame.
[0011] As a further technical solution of the present invention, one side of the cooling injection mold is fixedly connected to the top plate; a pouring port is provided on the top plate.
[0012] As a further technical solution of the present invention, two first cooling pipes are provided and are symmetrically arranged. The first cooling pipes are arranged in a semicircular shape.
[0013] Compared with the prior art, the beneficial effects of the present invention are:
[0014] 1. When in use, the cooling injection mold is placed above the cooling injection plate, and a guide column is set between the cooling injection mold and the cooling injection plate to effectively ensure the sealing overlap between the two molds. The fluid is then poured through the pouring port opened on the top plate to realize product molding through the cavity between the two molds;
[0015] 2. The utility model uses an air gun to clean the inside of the cavity before pouring. During cleaning, the compressed air contains moisture. Thus, before pouring, the cavity is preheated by the heating coil inside the heating plate. This has the advantages of effectively evaporating the moisture inside the cavity and increasing the temperature inside the cavity. During pouring, it ensures that the fluid has good fluidity and prevents the internal fluid from continuing to flow when a cooling layer is formed on the surface, thereby forming dark spots or wrinkles on the surface of the product.
[0016] 3. The utility model realizes cooling treatment of the fluid in the first cooling pipe inside the cooling injection mold. Two channels are provided on the first cooling pipe. In this way, when cooling treatment is performed on the fluid at the pouring port, the flow rate of the cooling water in the first cooling pipe can be accelerated, thereby realizing effective cooling of the fluid at the pouring port. The first cooling pipe inside the cooling injection mold cooperates with the circulating water pipe inside the cooling injection molding plate to reduce the temperature difference between the fluid at the pouring port and the fluid inside the cavity, thereby reducing the gloss difference on the product surface and effectively ensuring the gloss of the product surface. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a three-dimensional structural diagram of the utility model.
[0018] Figure 2 This utility model Figure 1 Bottom view of the bottom structure.
[0019] Figure 3 This utility model Figure 1 Left view of .
[0020] Figure 4 This utility model Figure 3 Cross-sectional view of the internal structure at AA.
[0021] Figure 5 This utility model Figure 3 Cross-sectional view of the internal structure at BB.
[0022] Figure 6 This utility model Figure 1 Right view of .
[0023] Figure 7 This utility model Figure 6 Cross-sectional view of the internal structure at AA.
[0024] In the figure: 1-top plate, 2-pouring port, 3-cooling injection mold, 30-first cooling pipe, 31-connecting valve, 4-guide column, 5-cooling injection plate, 50-circulating water pipe, 6-heating plate, 60-heating coil, 7-base, 8-top column, 9-guide rack, 10-injection mold. DETAILED DESCRIPTION
[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0026] See also Figure 1-7 In an embodiment of the present invention, a mold capable of reducing surface defects of a product includes a cooling injection mold 3; a first cooling pipe 30 is provided inside the cooling injection mold 3; a connecting valve 31 is provided at the end of the first cooling pipe 30; a plurality of guide pillars 4 are provided at the bottom of the cooling injection mold 3; a cooling injection plate 5 is provided below the cooling injection mold 3; holes are opened on the cooling injection plate 5 to cooperate with the guide pillars 4; the cooling injection plate 5 is also provided with guide pillars 4;
[0027] The cooling injection molding plate 5 is provided with a circulating water pipe 50 inside; the cooling injection molding plate 5 is provided with a heating plate 6 on the side away from the cooling injection mold 3;
[0028] A heating coil 60 is provided inside the heating plate 6;
[0029] By adopting the above technical solution, when in use, the cooling injection mold 3 is placed above the cooling injection plate 5, and a guide column 4 is set between the cooling injection mold 3 and the cooling injection plate 5 to effectively ensure the sealing overlap between the two molds. The fluid is then poured through the pouring port 2 opened on the top plate 1 to realize product molding through the cavity between the two molds.
[0030] The heating plate 6 is fixedly connected to the base 7 on the side away from the cooling injection molding plate 5; a top column 8 is provided between the heating plate 6 and the base 7;
[0031] An injection mold 10 is provided on the cooling injection plate 5 ; a flow guide frame 9 is provided above the injection mold 10 ; a flow channel is provided inside the flow guide frame 9 .
[0032] By adopting the above technical solution, before pouring, the inside of the cavity is first cleaned with an air gun. During cleaning, there is moisture in the compressed air. In this way, before pouring, the cavity is preheated by the heating coil 60 inside the heating plate 6. The advantage of this is that the moisture inside the cavity can be effectively evaporated. Secondly, the temperature inside the cavity can be increased. During pouring, it is ensured that the fluid has good fluidity to prevent the internal fluid from continuing to flow when a cooling layer is formed on the surface, thereby forming dark spots or wrinkles on the surface of the product.
[0033] In this embodiment, one side of the cooling injection mold 3 is fixedly connected to the top plate 1; a pouring port 2 is provided on the top plate 1.
[0034] More specifically, there are two first cooling pipes 30 , which are symmetrically arranged. The first cooling pipes 30 are arranged in a semicircular shape.
[0035] By adopting the above technical solution, the first cooling pipe 30 inside the cooling injection mold 3 is used to cool the fluid. Two channels are provided on the first cooling pipe 30. In this way, when the fluid at the pouring port 2 is cooled, the flow rate of the cooling water in the first cooling pipe 30 can be accelerated, thereby effectively cooling the fluid at the pouring port 2. The first cooling pipe 30 inside the cooling injection mold 3 cooperates with the circulating water pipe 50 inside the cooling injection molding plate 5 to reduce the temperature difference between the fluid at the pouring port 2 and the fluid inside the cavity, thereby reducing the gloss difference on the product surface and effectively ensuring the gloss of the product surface.
[0036] The working principle of the utility model is as follows: when in use, the cooling injection mold 3 is placed above the cooling injection plate 5, and a guide column 4 is set between the cooling injection mold 3 and the cooling injection plate 5 to effectively ensure the sealing overlap between the two molds, and then the fluid is poured through the pouring port 2 opened on the top plate 1 to realize product molding through the cavity between the two molds;
[0037] Before pouring, the inside of the cavity is cleaned with an air gun. During cleaning, there is moisture in the compressed air. Thus, before pouring, the cavity is preheated by the heating coil 60 inside the heating plate 6. This has the advantages of effectively evaporating the moisture inside the cavity and increasing the temperature inside the cavity. During pouring, it ensures that the fluid has good fluidity and prevents the internal fluid from continuing to flow when a cooling layer is formed on the surface, thereby forming dark spots or wrinkles on the surface of the product.
[0038] The first cooling pipe 30 inside the cooling injection mold 3 is used to cool the fluid. Two channels are provided on the first cooling pipe 30. In this way, when the fluid at the pouring port 2 is cooled, the flow rate of the cooling water in the first cooling pipe 30 can be accelerated to achieve effective cooling of the fluid at the pouring port 2. The first cooling pipe 30 inside the cooling injection mold 3 cooperates with the circulating water pipe 50 inside the cooling injection molding plate 5 to reduce the temperature difference between the fluid at the pouring port 2 and the fluid inside the cavity, thereby reducing the gloss difference on the product surface and effectively ensuring the gloss of the product surface.
[0039] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.
[0040] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.
Claims
1. A mold capable of reducing surface defects of a product, characterized by: The invention comprises a cooling injection mold (3); a first cooling pipe (30) is provided inside the cooling injection mold (3); a connecting valve (31) is provided at the end of the first cooling pipe (30); a plurality of guide pillars (4) are provided at the bottom of the cooling injection mold (3); a cooling injection plate (5) is provided below the cooling injection mold (3); a hole is provided on the cooling injection plate (5) to cooperate with the guide pillars (4); and the cooling injection plate (5) is also provided with guide pillars (4); A circulating water pipe (50) is provided inside the cooling injection molding plate (5); and a heating plate (6) is provided on the side of the cooling injection molding plate (5) away from the cooling injection molding mold (3).
2. A mold capable of reducing product surface defects according to claim 1, characterized in that: A heating coil (60) is provided inside the heating plate (6).
3. The mold capable of reducing product surface defects according to claim 1, characterized in that: The heating plate (6) is fixedly connected to the base (7) on the side away from the cooling injection molding plate (5); a top column (8) is provided between the heating plate (6) and the base (7).
4. A mold capable of reducing product surface defects according to claim 3, characterized in that: An injection mold (10) is provided on the cooling injection plate (5); a flow guide frame (9) is provided above the injection mold (10); and a flow channel is provided inside the flow guide frame (9).
5. The mold capable of reducing product surface defects according to claim 4, characterized in that: One side of the cooling injection mold (3) is fixedly connected to the top plate (1); a pouring port (2) is provided on the top plate (1).
6. The mold capable of reducing product surface defects according to claim 1, characterized in that: Two first cooling pipes (30) are provided and are symmetrically arranged. The first cooling pipes (30) are arranged in a semicircular shape.