Double-injection four-layer car lamp lens injection molding mold

Abstract

The injection molding mold comprises a base, a movable mold which circularly rotates by 90 degrees in the designated direction is installed on the base through a rotating mechanism, mold cavities are sequentially installed on the surface of the movable mold according to 90-degree equal indexing, and a fixed mold matched with the movable mold is further arranged on the base. A first mold core, a second mold core, a third mold core and a fourth mold core which are matched with the mold cavity are arranged on the fixed mold; the mechanical arm is used for taking a formed part after forming; the four-color injection molding process is achieved through a common double-injection machine table, product shrinkage is effectively improved, the production efficiency is improved, and meanwhile the input cost of equipment is effectively reduced. According to the scheme, a machine table does not need to be provided with a rotating disc, only equipment needs to be provided with a set of movable mold, the movable mold is rotated to control glue feeding of each layer of products, and the thick-wall glue position is composed of the fixed movable mold cavities.

Description

Technical Field

[0001] The invention relates to the technical field related to lens injection molding, and in particular to a double-shot four-layer vehicle lamp lens injection molding mold. Background Art

[0002] Light guides are an important part of automotive lighting. In recent years, more and more automotive headlight guides have been used as lenses using injection molding. Using light guides as light distribution lenses can not only reduce the cost of headlights, but also reduce energy consumption while ensuring the same functional conditions. At the same time, the style of the headlights also becomes more beautiful due to the use of light guide strips. However, for thick and thin light guide lens products, many of the thick walls reach more than 25mm to about 30mm. Therefore, the injection molding process is prone to product shrinkage and long molding cycle, which is a pain point. The current traditional injection molding process is summarized as follows:

[0003] Traditional single-shot injection molding has a very long injection molding cycle for products with thick walls over 25 mm. It usually takes more than 800 seconds to complete a mold product. If you want to achieve a better surface effect, it may even take about 1,200 seconds. This method has a long cooling time, low efficiency, and no guarantee for product precision, especially for products with high appearance requirements. The impact is more obvious, especially the problem of product shrinkage is more serious, which is also a pain point in the current industry.

[0004] The second method is to use a rotary double-shot (injection) double-layer molding solution. This molding method can solve some products with relatively thick structures and high requirements for transparent thick-walled products. The rotary double-shot double-layer molding solution, when completing the first shot injection molding, rotate the movable mold side 180 degrees to complete the injection molding of the second layer of the product. Although the rotary double-shot double-layer injection molding of thick and thin products can solve some relatively thick and thin products, the molding cycle can be reduced to about 500-600 seconds. Therefore, the molding time is still very long, and the surface shrinkage is still difficult to eliminate.

[0005] The third method is the rotary three-color three-layer injection molding solution. The rotary three-color three-layer injection molding process steps include rotating the movable mold side 120 degrees to complete the injection molding of the second layer of the product after the first shot is completed, and then rotating the movable mold side 120 degrees to complete the injection molding of the third layer of the product after the second shot is completed. The rotary three-color three-layer injection molding process can solve some relatively thick and demanding thick and thin products, and the molding cycle can be controlled at about 350 seconds. The shrinkage marks of the product can usually be effectively controlled. However, the disadvantage is that an injection molding machine with a three-color turntable is required, and the investment cost of the injection molding machine equipment is high. Summary of the invention

[0006] In order to solve the defects in the prior art, the present invention provides a double-shot four-layer vehicle lamp lens injection molding mold.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0008] The present invention discloses a double-shot four-layer vehicle lamp lens injection molding mold, comprising a base, on which a movable mold is mounted via a rotating mechanism and cyclically rotates 90 degrees in a specified direction, and mold cavities are sequentially mounted on the surface of the movable mold at equal divisions of 90 degrees, and a fixed mold is also arranged on the base to match the movable mold, and the fixed mold is provided with a first mold core, a second mold core, a third mold core and a fourth mold core that match the mold cavity; and also includes a robot for taking the molded part after molding;

[0009] The fixed mold is provided with a glue inlet which is connected with the mold cavity and through which the glue inlet insert is inserted at an angle;

[0010] The method of using the molding mold is to form a first layer of finished products by injection molding in the first mold core and the mold cavity, open the mold, and then the rotating mechanism rotates 90 degrees in the specified direction to feed the first layer of finished products to the bottom of the second mold core, close the mold for injection molding, and composite the second layer of finished products on the first layer of finished products to form a semi-finished product; open the mold again, and then the rotating mechanism rotates 90 degrees in the specified direction again to feed the semi-finished products to the bottom of the third mold core, close the mold for injection molding, and composite the third layer of finished products on the semi-finished products to form a primary finished product; open the mold again, and then the rotating mechanism rotates 90 degrees in the specified direction to feed the primary finished product to the bottom of the fourth mold core, and finally close the mold for injection molding to form a fourth layer on the surface of the primary finished product, and finally open the mold to form a final finished product, which can be picked up by a robot.

[0011] As a preferred technical solution of the present invention, the cooling time of the first layer of finished products, the second layer of finished products, the third layer of finished products and the third layer of finished products is θ1′, then

[0012]

[0013] Where T w Indicates the average wall temperature of the injection mold, T m Indicates melt temperature °C, T s represents the average demoulding temperature ℃, k represents the effective thermal diffusivity of the plastic in mm2 / s, and t represents the mold wall thickness.

[0014] As a preferred technical solution of the present invention, the thickness of the first layer of finished product is greater than the thickness of the second layer of finished product, the thickness of the second layer of finished product is greater than the thickness of the third layer of finished product, and the thickness of the third layer of finished product is greater than the thickness of the fourth layer of finished product.

[0015] As a preferred technical solution of the present invention, the rotating mechanism includes a spline shaft arranged on a base, the spline shaft is provided with a sleeve moving along the spline shaft, the sleeve is provided with a gear, and the base is provided with a driving mechanism for driving the gear to move ninety degrees; the base is also provided with a lifting mechanism for lifting the spline shaft, the movable mold is installed on the top of the spline shaft, and the base is provided with a storage cavity for accommodating the movable mold.

[0016] As a preferred technical solution of the present invention, the driving mechanism includes a transmission rack disposed on the base and meshing with the gear.

[0017] As a preferred technical solution of the present invention, a positioning block is fixed on the base, a limiting block is provided on the gear, and a blocking block for blocking the limiting block is provided on the positioning block.

[0018] The beneficial effects of the present invention are:

[0019] In the double-shot four-layer headlight lens injection molding mold, a rotating movable mold is set to inject and mold the first layer of finished products in the first mold core and the mold cavity, and then the mold is opened. Then the rotating mechanism rotates 90 degrees in the specified direction to send the first layer of finished products to the bottom of the second mold core, and the mold is closed for injection molding, and the second layer of finished products is compounded on the first layer of finished products to form a semi-finished product; the mold is opened again, and then the rotating mechanism rotates 90 degrees in the specified direction again to send the semi-finished product to the bottom of the third mold core, and then the mold is closed for injection molding, and the third layer of finished products is compounded on the semi-finished product to form a primary finished product; the mold is opened again, and then the rotating mechanism rotates 90 degrees in the specified direction to send the primary finished product to the bottom of the fourth mold core, and finally the mold is closed for injection molding to form a fourth layer on the surface of the primary finished product, and finally the mold is opened to form a final finished product, which can be taken by a robot; the present invention uses a four-color injection molding process, which effectively improves product shrinkage and improves production efficiency while effectively reducing the investment cost of equipment. This invention does not require the machine to be equipped with a turntable, but only requires the equipment to be equipped with a set of movable molds. The rotating movable mold is used to control the glue feeding of each layer of the product. The thick-wall glue position is composed of a fixed movable mold cavity, which greatly saves material and processing costs. At the same time, the molding cycle and quality are better than the double-shot double-layer and three-color three-layer injection molding processes. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0021] In the attached picture:

[0022] Figure 1 It is a structural schematic diagram of a double-shot four-layer vehicle lamp lens injection molding mold of the present invention;

[0023] Figure 2 It is a structural schematic diagram of a movable mold of a double-shot four-layer vehicle lamp lens injection molding mold of the present invention;

[0024] Figure 3 It is a structural schematic diagram of a receiving cavity of a double-shot four-layer vehicle lamp lens injection molding mold of the present invention;

[0025] Figure 4 It is a structural schematic diagram of a rotating mechanism of a double-shot four-layer vehicle lamp lens injection molding mold of the present invention;

[0026] Figure 5 It is a schematic diagram of the final product result of a double-shot four-layer vehicle lamp lens injection molding mold of the present invention;

[0027] Figure 6 It is a result schematic diagram of a manipulator of a double-shot four-layer vehicle lamp lens injection molding mold of the present invention;

[0028] Figure 7 It is a schematic diagram of the mold fixing result of a double-shot four-layer vehicle lamp lens injection molding mold of the present invention;

[0029] Figure 8 It is a schematic diagram of the arrangement of the mold cavity of a double-shot four-layer vehicle lamp lens injection molding mold of the present invention;

[0030] Fig. 9 It is a schematic diagram of injection molding of a double-shot four-layer vehicle lamp lens injection molding mold of the present invention;

[0031] Fig.10 It is a schematic diagram of the rotation of a movable mold of a double-shot four-layer vehicle lamp lens injection molding mold of the present invention;

[0032] Fig.11 It is a schematic diagram of the assembly of a rotating mechanism of a double-shot four-layer vehicle lamp lens injection molding mold of the present invention;

[0033] Fig.12 The utility model is a schematic diagram of the assembly of a movable mold of a double-shot four-layer vehicle lamp lens injection molding mold of the present invention.

[0034] In the figure: 1. base; 2. rotating mechanism; 201. spline shaft; 202. bushing; 203. gear; 204. transmission rack; 205. positioning block; 206. limit block; 207. blocking block; 3. movable mold; 4. first mold core; 5. second mold core; 6. third mold core; 7. fourth mold core; 8. fixed mold; 9. manipulator; 10. mold cavity. DETAILED DESCRIPTION

[0035] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0036] Example: Figures 1 to 12 As shown, the present invention is a double-shot four-layer car lamp lens injection molding mold, comprising a base 1, on which a movable mold 3 is installed through a rotating mechanism 2 to rotate 90 degrees in a specified direction, and the surface of the movable mold 3 is sequentially installed with mold cavities at equal divisions of ninety degrees, and the base 1 is also provided with a fixed mold 8 that matches the movable mold 3, and the fixed mold 8 is provided with a first mold core 4, a second mold core 5, a third mold core 6 and a fourth mold core 7 that match the mold cavity; and also includes a robot 9 for taking the molded part after molding; wherein Fig. 9 as well as Fig.10 N1, N2, N3 and N4 refer to the workstation numbers for installing clockwise rotation marks, and N1, N2, N3 and N4 correspond one to one with the positions of the first mold core 4, the second mold core 5, the third mold core 6 and the fourth mold core 7.

[0037] The fixed mold 8 is provided with a glue inlet which is connected to the mold cavity and through which the glue inlet insert is inserted at an angle;

[0038] The method of using the molding mold is to form a first layer of finished products by injection molding in the first mold core 4 and the mold cavity, open the mold, and then the rotating mechanism 2 rotates 90 degrees in the specified direction to send the first layer of finished products to the bottom of the second mold core 5, close the mold for injection molding, and composite the second layer of finished products on the first layer of finished products to form a semi-finished product; open the mold again, and then the rotating mechanism 2 rotates 90 degrees in the specified direction again, and sends the semi-finished product to the bottom of the third mold core 6, and then close the mold for injection molding, and composite the third layer of finished products on the semi-finished product to form a preliminary finished product; open the mold again, and then the rotating mechanism 2 rotates 90 degrees in the specified direction, and sends the preliminary finished product to the bottom of the fourth mold core 7, and finally close the mold for injection molding, forming the fourth layer on the surface of the preliminary finished product, and finally open the mold to form the final finished product, which can be taken by a robot. The four-color injection molding process is realized by the ordinary double-shot machine, which effectively improves product shrinkage and improves production efficiency, while effectively reducing the investment cost of the equipment. This invention does not require the machine to be equipped with a turntable, but only requires the equipment to be equipped with a set of movable molds. The rotating movable mold is used to control the glue feeding of each layer of the product. The thick-wall glue position is composed of a fixed movable mold cavity, which greatly saves material and processing costs. At the same time, the molding cycle and quality are better than the double-shot double-layer and three-color three-layer injection molding processes.

[0039] The cooling time of the first layer of finished products, the second layer of finished products, the third layer of finished products and the third layer of finished products is θ1′, then

[0040]

[0041] Where T ω Indicates the average wall temperature of the injection mold, T m Indicates melt temperature °C, Ts represents the average demoulding temperature ℃, k represents the effective thermal diffusivity of the plastic in mm2 / s, and t represents the mold wall thickness.

[0042] The thickness of the first layer of finished product is greater than that of the second layer of finished product, the thickness of the second layer of finished product is greater than that of the third layer of finished product, and the thickness of the third layer of finished product is greater than that of the fourth layer of finished product. The thickness of the first layer in the present invention is 10.37 mm, the second layer is about 8.1233 mm, the third layer is about 5.8766 mm, and the fourth layer is about 3.6299 mm; this has the lowest possible cooling time, thereby shortening the manufacturing cycle and improving production efficiency.

[0043] The rotating mechanism 2 includes a spline shaft 201 arranged on the base 1, a sleeve 202 moving along the spline shaft 201 is arranged on the spline shaft 201, a gear 203 is arranged on the sleeve 202, and a driving mechanism for driving the gear 203 to move 90 degrees is arranged on the base 1; the base 1 is also provided with a lifting mechanism for lifting the spline shaft 201, the movable mold 3 is installed on the top of the spline shaft 201, and the base 1 is provided with a storage cavity for storing the movable mold 3, so that the lifting mechanism can be retracted to push the spline shaft out, so that the meat paste movable mold is pushed out of the storage cavity from the movable mold 3, and then the gear is driven to rotate 90 degrees through the driving mechanism, so that the movable mold 3 is driven to rotate, thereby realizing the transfer of the product. Among them, the driving mechanism includes a transmission rack 204 meshing with the gear 203 arranged on the base 1, which has the characteristics of simple structure and easy control. During operation, the transmission rack 204 has a mechanism that drives the transmission rack 204 as a whole to separate from the gear 203. During the retraction of the transmission rack 204, the transmission rack 204 separates from the gear 203, thus preventing the transmission rack 204 from retracting and driving the gear 203 to rotate.

[0044] A positioning block 205 is fixed on the base 1, a limit block 206 is provided on the gear 203, a blocking block 207 is provided on the positioning block 205 for blocking the limit block 206, and four blocking blocks 207 are provided to ensure that the gear 203 rotates at an angle of ninety degrees each time, wherein the blocking block 207 is provided with a driving mechanism that can drive the blocking block 207 to retract and extend, so that when the gear 203 rotates again, it will not be blocked.

[0045] The first layer of finished product is formed by injection molding in the first mold core 4 and the mold cavity, and the mold is opened. Then the rotating mechanism 2 rotates 90 degrees in the specified direction to send the first layer of finished product to the bottom of the second mold core 5, and the mold is closed for injection molding. The second layer of finished product is compounded on the first layer of finished product to form a semi-finished product; the mold is opened again, wherein the first layer of finished product is formed by the second layer of finished product by the first shot injection molding, and then the rotating mechanism 2 rotates 90 degrees in the specified direction again, and the semi-finished product is sent to the bottom of the third mold core 6, and then the mold is closed for injection molding, and the third layer of finished product is compounded on the semi-finished product to form a preliminary finished product; the mold is opened again, and then the rotating mechanism 2 rotates 90 degrees in the specified direction to send the preliminary finished product to the bottom of the fourth mold core 7, and finally the mold is closed for injection molding to form a fourth layer on the surface of the preliminary finished product, and finally the mold is opened, and the third layer of finished product is formed by the fourth layer of finished product by the second shot to form a final finished product, which can be taken by a robot. The four-color injection molding process is realized by an ordinary double-shot machine, which effectively improves product shrinkage and improves production efficiency while effectively reducing the investment cost of equipment. This invention does not require the machine to be equipped with a turntable, but only requires the equipment to be equipped with a set of movable molds. The rotating movable mold is used to control the glue feeding of each layer of the product. The thick-wall glue position is composed of a fixed movable mold cavity, which greatly saves material and processing costs. At the same time, the molding cycle and quality are better than the double-shot double-layer and three-color three-layer injection molding processes.

[0046] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A double-shot four-layer car lamp lens injection molding mold, characterized in that: The invention comprises a base (1), on which a movable mold (3) is mounted via a rotating mechanism (2) for cyclically rotating 90 degrees in a specified direction, and mold cavities (10) are sequentially mounted on the surface of the movable mold (3) at equal intervals of 90 degrees, and the base (1) is also provided with a fixed mold (8) for matching with the movable mold (3), and the fixed mold (8) is provided with a first mold core (4), a second mold core (5), a third mold core (6) and a fourth mold core (7) for matching with the mold cavity (10); and the invention also comprises a robot (9) for picking up a molded part after molding; The fixed mold (8) is provided with a glue inlet which is connected to the mold cavity (10) and through which the glue inlet insert is inserted at an angle; The molding die is used in a method of forming a first layer of finished product by injection molding in a first mold core (4) and a mold cavity (10), opening the mold, and then rotating the rotating mechanism (2) by 90 degrees in a specified direction to feed the first layer of finished product to the bottom of a second mold core (5), closing the mold for injection molding, and compounding the second layer of finished product on the first layer of finished product to form a semi-finished product; opening the mold again, and then rotating the rotating mechanism (2) by 90 degrees in a specified direction again to feed the semi-finished product to the bottom of a third mold core (6), and then closing the mold for injection molding, and compounding the third layer of finished product on the semi-finished product to form a primary finished product; opening the mold again, and then rotating the rotating mechanism (2) by 90 degrees in a specified direction to feed the primary finished product to the bottom of a fourth mold core (7), and finally closing the mold for injection molding, forming a fourth layer on the surface of the primary finished product, and finally opening the mold to form a final finished product, which can be picked up by a robot.

2. The double-shot four-layer vehicle lamp lens injection molding mold according to claim 1, characterized in that: The cooling time of the first layer of finished products, the second layer of finished products, the third layer of finished products and the third layer of finished products is θ1′, then Where T ω Indicates the average wall temperature of the injection mold, T m Indicates melt temperature °C, T s represents the average demoulding temperature ℃, k represents the effective thermal diffusivity of the plastic in mm2 / s, and t represents the mold wall thickness.

3. The double-shot four-layer vehicle lamp lens injection molding mold according to claim 2, characterized in that: The thickness of the first layer of finished product is greater than the thickness of the second layer of finished product, the thickness of the second layer of finished product is greater than the thickness of the third layer of finished product, and the thickness of the third layer of finished product is greater than the thickness of the fourth layer of finished product.

4. The double-shot four-layer vehicle lamp lens injection molding mold according to claim 1, characterized in that: The rotating mechanism (2) comprises a spline shaft (201) arranged on a base (1); a shaft sleeve (202) moving along the spline shaft (201) is arranged on the spline shaft (201); a gear (203) is arranged on the shaft sleeve (202); and a driving mechanism for driving the gear (203) to move ninety degrees is arranged on the base (1); a lifting mechanism for lifting the spline shaft (201) is also arranged on the base (1); the movable mold (3) is mounted on the top of the spline shaft (201); and a receiving cavity for receiving the movable mold (3) is arranged on the base (1).

5. The double-shot four-layer vehicle lamp lens injection molding mold according to claim 4, characterized in that: The driving mechanism comprises a transmission rack (204) which is arranged on the base (1) and meshes with the gear (203).

6. The double-shot four-layer vehicle lamp lens injection molding mold according to claim 4, characterized in that: A positioning block (205) is fixed on the base (1), a limiting block (206) is provided on the gear (203), and a blocking block (207) for blocking the limiting block (206) is provided on the positioning block (205).

7. The double-shot four-layer vehicle lamp lens injection molding mold according to claim 1, characterized in that: The first mold core (4), the second mold core (5), the third mold core (6) and the fourth mold core (7) are each provided with two groups.

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