Injection mold for automobile lampshade

Abstract

The invention relates to the technical field of injection molding molds, and discloses an automobile lampshade injection mold which comprises a fixed mold and a movable mold, the fixed mold is provided with a mold cavity, the movable mold is provided with a mold core used for being matched with the mold cavity to form an automobile lampshade, the fixed mold comprises a front mold frame and a rear mold frame, and a cooling cavity is formed in the end face, facing the rear mold frame, of the front mold frame. A plurality of supporting columns located in the cooling cavity are arranged on the front mold frame and / or the rear mold frame. The supporting column is a rotary body with the diameter gradually decreasing from one end to the other end, and the rotary generatrix of the circumferential side face of the supporting column is a straight line or a curve. A cooling liquid outlet communicated with the cooling cavity is formed in the center of the rear mold frame; a plurality of cooling liquid inlets are formed in the side wall of the front mold frame and distributed around the central axis of the cooling liquid outlet in a circumferential array mode, and the included angles between the central axes of any two adjacent cooling liquid inlets are equal. The mold is easy to disassemble and clean, injection molding products can be efficiently and uniformly cooled, the maintenance cost of the mold can be remarkably reduced, and the defect rate of the injection molding products is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of injection molding molds, and in particular relates to an injection mold for an automobile lampshade. Background Art

[0002] In the background technology of injection molded lampshade production, the design and optimization of the mold cooling system has always been a key link in improving production efficiency and ensuring product quality. Traditional mold cooling systems often use a simple cooling water channel layout and manual control method, which has problems such as uneven cooling, high energy consumption, and difficult maintenance. These problems not only affect the quality and production efficiency of the injection molded lampshade, but also increase production costs and energy consumption. These problems are particularly prominent in mass production and high-precision injection molded parts production. Summary of the invention

[0003] The object of the present invention is to provide an automobile lampshade injection mold which has high cooling efficiency and is easy to maintain.

[0004] In order to achieve the above object, the technical solution specifically provided by the present invention is as follows:

[0005] A car lampshade injection mold comprises a fixed mold and a movable mold, wherein the fixed mold is provided with a cavity, and the movable mold is provided with a core for cooperating with the cavity to form the car lampshade, the fixed mold comprises a front mold frame and a rear mold frame which are detachably and fixedly connected, a cooling cavity is provided on the end surface of the front mold frame facing the rear mold frame, and a plurality of support columns located in the cooling cavity are provided on the front mold frame and / or the rear mold frame; the support columns are rotating bodies whose diameters gradually decrease from one end to the other end, and the rotating generatrix of the circumferential side surface is a straight line or a curve; a coolant outlet communicating with the cooling cavity is provided at the center of the rear mold frame; a plurality of coolant inlets are provided on the side wall of the front mold frame, and the plurality of coolant inlets are distributed in a circular array around the central axis of the coolant outlet, and the angles between the central axes of any two adjacent coolant inlets are equal.

[0006] By adopting the above technical solution, the coolant inlets arranged in a circular array supply coolant at the same time, and the distances from each coolant inlet to the coolant outlet are relatively short and not much different, which is conducive to rapid cooling; at the same time, the setting of several support columns of specific shapes makes it easy for the coolant to form turbulence in the cooling cavity, which improves the cooling efficiency and increases the uniformity of the temperature in each area of ​​the mold, so that each part of the injection molded product is cooled at a relatively balanced rate, reducing the occurrence of shrinkage, deformation and other diseases. Compared with the cooling method of directly opening a flow channel in the mold, the cooling cavity of the present invention is not easy to be blocked, and the front mold frame and the rear mold frame can be detachably connected, and the cooling cavity can be easily cleaned after disassembly, which reduces the mold maintenance cost.

[0007] Furthermore, the revolution generatrix of the circumferential side of the support column is a curve, and in the direction from the end with a larger diameter of the support column toward the end with a smaller diameter, the angle between the tangent of any point on the revolution generatrix of the circumferential side and the central axis of the support column first gradually increases and then gradually decreases. This type of support column is easier to guide the coolant to form turbulence in the cooling cavity, increase heat exchange efficiency, and facilitate uniform and efficient cooling.

[0008] Furthermore, support columns are provided on the front mold frame and the rear mold frame, and the support columns arranged on the front mold frame and the rear mold frame are staggered, which increases the uniformity of the flow of the coolant in the cooling cavity and facilitates uniform and efficient cooling.

[0009] Furthermore, the diameter of the support column on the front mold frame gradually decreases towards the direction approaching the rear mold frame, and the diameter of the support column on the rear mold frame gradually decreases towards the direction approaching the front mold frame.

[0010] Furthermore, the ends of the upper support columns of the front mold frame are abutted against or spaced apart from the end surface of the rear mold frame, and the ends of the upper support columns of the rear mold frame are abutted against or spaced apart from the end surface of the front mold frame.

[0011] Furthermore, the plurality of cooling liquid inlets are arranged along the tangent direction of a circle whose equivalent area is equal to the maximum projection area of ​​the cavity on the fixed mold end surface, which is more conducive to the rapid flow and diffusion of the cooling liquid, thereby achieving uniform and efficient cooling of the molded product.

[0012] Furthermore, a sealing ridge is arranged on the periphery of the end surface of the rear mold frame facing the front mold frame, and a sealing groove for the sealing ridge to be inserted into is opened on the front mold frame, thereby increasing the sealing between the front mold frame and the rear mold frame and preventing the problem of coolant leakage.

[0013] Furthermore, the four corners of the rear mold frame are each provided with an abutment block located on the inner side of the sealing ridge, and the cooling cavity is provided with a pad block for abutting and cooperating with the end face of the abutment block, which further increases the tightness of the fit between the front mold frame and the rear mold frame, improves the sealing, and is less likely to cause coolant leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is an exploded schematic diagram of the injection mold for the automobile lampshade in Example 1;

[0015] Figure 2 It is a cross-sectional view of the injection mold of the automobile lamp cover in Example 1;

[0016] Figure 3 for Figure 2 A magnified view of part A;

[0017] Figure 4 It is a structural schematic diagram of the front mold frame in Example 1;

[0018] Figure 5is a cross-sectional view of the injection mold for the automobile lamp cover in Example 2;

[0019] Figure 6 It is a cross-sectional view of the fixed mold of the automobile lampshade injection mold in Example 2;

[0020] Figure 7 for Figure 5 Magnified view of part B.

[0021] Description of reference numerals:

[0022] 1. Moving mold; 11. Positioning convex block; 2. Fixed mold; 21. Front mold frame; 211. Cooling chamber; 212. Cooling liquid inlet; 213. Sealing groove; 214. Pad; 215. Positioning notch; 22. Rear mold frame; 221. Cooling liquid outlet; 222. Abutment block; 223. Sealing convex ridge; 2231. Sealing rubber ring; 224. Guide column; 3. Support column. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present application will be further described in detail below in conjunction with the accompanying drawings.

[0024] Example 1

[0025] An injection mold for automobile lampshade, referring to Figure 1 , including a movable mold 1 and a fixed mold 2 that can be relatively opened and closed, the fixed mold 2 is provided with a cavity, and the movable mold 1 is provided with a core (only for schematic illustration, the specific shapes of the cavity and the core are not shown in the figure). The core and the cavity cooperate to form a molding cavity for the automobile lampshade, after the liquid injection molding material is injected, cooled, and demolded, the automobile lampshade injection molded part can be obtained.

[0026] Reference Figure 1 , positioning notches 215 are provided at the four corners of the end surface of the fixed mold 2 facing the movable mold 1, and positioning protrusions 11 are provided at corresponding positions on the movable mold 1. When the molds are closed, the positioning protrusions 11 are inserted into the positioning notches 215. The fixed mold 2 includes a front mold frame 21 and a rear mold frame 22 that are detachably fixedly connected, both of which are in the shape of rectangular plates. A plurality of guide pillars 224 are provided on the rear mold frame 22, and the guide pillars 224 penetrate the front mold frame 21 and form protruding portions on the end surface of the front mold frame 21; positioning holes (not shown in the figure) for inserting the protruding portions of the guide pillars 224 are provided at corresponding positions of the movable mold 1. Through the mutual cooperation of the positioning protrusions 11 and the positioning notches 215, and the cooperation between the protruding portions of the guide pillars 224 and the positioning holes at corresponding positions on the movable mold 1, the movable mold 1 and the fixed mold 2 can be accurately closed.

[0027] Reference Figure 1 and Figure 2A cooling cavity 211 is formed on the end surface of the front mold frame 21 away from the movable mold 1, and a cooling liquid inlet 212 connected to the cooling cavity 211 is formed on the surrounding sides; a cooling liquid outlet 221 connected to the cooling cavity 211 is formed at the center of the rear mold frame 22. The cooling liquid can be continuously injected into the cooling cavity 211 from the cooling liquid inlet 212 and continuously discharged from the cooling liquid outlet 221 through a pipeline, so that the cooling liquid can circulate in the cooling cavity 211, and the injection molded product can be quickly and evenly cooled before demolding.

[0028] Reference Figure 1 and Figure 2 In order to improve the efficiency and uniformity of cooling the injection molded product as much as possible and reduce the product defect rate, a plurality of support columns 3 are arranged in the cooling cavity 211. The support columns 3 are fixedly arranged on the cavity wall of the cooling cavity 211 and are arranged in a direction perpendicular to the end surface of the front mold frame 21. The plurality of support columns 3 are distributed in a rectangular array in the cooling cavity 211. In this embodiment, the length of the support column 3 is equal to the depth of the cooling cavity 211. In other embodiments, a shorter support column 3 may also be arranged, that is, a gap is formed between the end of the support column 3 and the rear mold frame 22.

[0029] Reference Figure 2 and Figure 3 , the support column 3 is a rotating body whose diameter gradually decreases from one end to the other end, and the generatrix of revolution on the circumferential side thereof is a straight line or a curve, such as a truncated cone. In this embodiment, the generatrix of revolution on the circumferential side of the support column 3 is a curve, and in the direction from the end with a larger diameter of the support column 3 toward the end with a smaller diameter, the angle between the tangent of any point on the generatrix of revolution on the circumferential side and the central axis of the support column 3 first gradually increases and then gradually decreases. The support columns 3 of this specific shape are distributed in a rectangular array, making it easier for the flowing coolant to form turbulence in the cooling chamber 211, thereby improving the heat transfer efficiency, and can improve the cooling efficiency and cooling uniformity of the injection molded product.

[0030] Reference Figure 1 and Figure 4 In order to cooperate with the support column 3 to achieve efficient and uniform cooling, a number of coolant inlets 212 are distributed in a circular array around the central axis of the coolant outlet 221. The angles between the central axes of any two adjacent coolant inlets 212 are equal, and the coolant inlets 212 are all arranged tangentially to a circle whose equivalent area is equal to the maximum projection area of ​​the cavity on the end face of the fixed mold 2. In this way, the coolant injection direction deviates from the length and width directions of the front mold frame 21. When each coolant inlet 212 injects coolant at the same time, it is easier to form turbulence in the cooling cavity 211. This arrangement, on the one hand, has a close and short distance from each coolant inlet 212 to the center of the cooling cavity 211. With the cooperation of the support column 3, it is more conducive to maintaining a relatively balanced state of coolant in various places in the cooling cavity 211, thereby effectively reducing defects in injection molded products caused by excessively high or low local temperatures.

[0031] Example 2

[0032] Embodiment 2 is based on Embodiment 1, except that:

[0033] Reference Figure 5 and Figure 6 A plurality of support columns 3 are also arranged on the rear mold frame 22, and the support columns 3 on the front mold frame 21 and the rear mold frame 22 are staggered with each other.

[0034] Reference Figure 5 and Figure 7 In order to improve the sealing performance between the front mold frame 21 and the rear mold frame 22, a plurality of sealing ridges 223 are arranged on the end surface of the rear mold frame 22, and a sealing groove 213 for the sealing ridges 223 to be inserted is opened on the front mold frame 21; at the same time, a sealing strip is inserted on the sealing ridges 223. The four corners of the rear mold frame 22 are also provided with abutment blocks 222 located on the inner side of the sealing ridges 223, and the cavity wall of the cooling cavity 211 is fixed with a cushion block 214 for abutting and cooperating with the abutment blocks 222. After the front mold frame 21 and the rear mold frame 22 are spliced ​​and installed, the sealing ridges 223 are inserted into the sealing grooves 213, and the abutment blocks are abutted against the cushion blocks 214, so that the front mold frame 21 and the rear mold frame 22 are sealed, and the problem of coolant leakage is not easy to occur.

[0035] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An automobile lampshade injection mold, comprising a fixed mold (2) and a movable mold (1), wherein the fixed mold (2) is provided with a cavity, and the movable mold (1) is provided with a core for cooperating with the cavity to form the automobile lampshade, characterized in that: The fixed mold (2) comprises a front mold frame (21) and a rear mold frame (22) which are detachably fixedly connected, a cooling cavity (211) is formed on the end surface of the front mold frame (21) facing the rear mold frame (22), and a plurality of support columns (3) located in the cooling cavity (211) are provided on the front mold frame (21) and / or the rear mold frame (22); the support columns (3) are rotating bodies whose diameters gradually decrease from one end to the other end, and the rotation generatrix of the circumferential side surface thereof is a straight line or a curve; a cooling liquid outlet (221) which is in communication with the cooling cavity (211) is formed at the center of the rear mold frame (22); a plurality of cooling liquid inlets (212) are formed on the side wall of the front mold frame (21), and the plurality of cooling liquid inlets (212) are distributed in a circular array around the central axis of the cooling liquid outlet (221), and the included angles between the central axes of any two adjacent cooling liquid inlets (212) are equal.

2. The automobile lampshade injection mold according to claim 1, characterized in that: The generatrix of revolution of the circumferential side surface of the support column (3) is a curve, and in the direction from the end with a larger diameter toward the end with a smaller diameter of the support column (3), the angle between the tangent of any point on the generatrix of revolution of the circumferential side surface and the central axis of the support column (3) tends to first gradually increase and then gradually decrease.

3. The automobile lampshade injection mold according to claim 2, characterized in that: Support columns (3) are provided on both the front mold frame (21) and the rear mold frame (22), and the support columns (3) provided on the front mold frame (21) and the rear mold frame (22) are arranged in a staggered manner.

4. The automobile lampshade injection mold according to claim 4, characterized in that: The diameter of the upper support column (3) of the front mold frame (21) gradually decreases towards the direction approaching the rear mold frame (22), and the diameter of the upper support column (3) of the rear mold frame (22) gradually decreases towards the direction approaching the front mold frame (21).

5. The automobile lampshade injection mold according to claim 4, characterized in that: The end of the upper support column (3) of the front mold frame (21) is against or spaced from the end surface of the rear mold frame (22), and the end of the upper support column (3) of the rear mold frame (22) is against or spaced from the end surface of the front mold frame (21).

6. An automobile lampshade injection mold according to any one of claims 1 to 5, characterized in that: The plurality of cooling liquid inlets (212) are arranged along the tangent direction of a circle whose equivalent area is equal to the maximum projection area of ​​the cavity on the end surface of the fixed mold (2).

7. An automobile lampshade injection mold according to any one of claims 1 to 5, characterized in that: The rear mold frame (22) is provided with a sealing ridge (223) on the periphery of the end surface facing the front mold frame (21), and the front mold frame (21) is provided with a sealing groove (213) for the sealing ridge (223) to be inserted into.

8. The automobile lampshade injection mold according to claim 7, characterized in that: The four corners of the rear mold frame (22) are each provided with an abutment block (222) located inside the sealing convex ridge (223), and the cooling cavity (211) is provided with a cushion block (214) for abutting and cooperating with the end surface of the abutment block (222).

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