Double-color injection mold and double-color injection method for silver decorative frame of automobile instrument

Abstract

The invention relates to the technical field of double-color injection molds, in particular to a double-color injection mold for a silver decorative frame of an automobile instrument, the double-color injection mold comprises a first injection fixed mold, a second injection fixed mold and two movable molds, after the first injection fixed mold and the movable molds are closed, a movable mold core moves upwards by a first distance, and the movable mold core, a first injection mold core and a lower mold core are closed to define a first injection mold cavity for forming a bottom shell; after the second-injection fixed mold and the movable mold are closed, the movable mold core moves downwards by a second distance to be closed with the second-injection mold core and the lower mold core to form a second-injection mold cavity for molding a color layer; and before secondary injection glue injection, the movable mold core moves downwards by a third distance to define a glue injection cavity with the fixed mold core and the lower mold core, and the top of the glue injection cavity is communicated and connected with the bottom of the secondary injection mold cavity. The invention further provides a double-color injection molding method of the silver decorative frame of the automobile instrument. Compared with the prior art, the problems of interpenetration, diffusion or color mixing of the color layer and the bottom shell can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of two-color injection molds, and in particular to a two-color injection mold and a two-color injection method for a silver decorative border of an automotive instrument panel. Background Art

[0002] In the related art, a silver decorative border of an automotive instrument panel usually has a bottom shell and a color layer attached to the surface of the bottom shell. The bottom shell is snap-fitted and installed on the automotive instrument panel, and the color layer is exposed.

[0003] In actual production operations, the inventors mainly have the following two manufacturing processes for the silver decorative border: The first one is to only injection-mold the bottom shell through an injection mold, and then spray the color layer on the surface of the bottom shell by a painting method. The defect of this manufacturing process is that the process takes a long time, and the color layer is relatively thin, and the paint is likely to fall off after long-term use, and it has gradually been abandoned. The second one is to injection-mold through a two-color injection mold. First, inject the bottom shell in the first shot, and then inject the color layer in the second shot. This manufacturing process can obtain a relatively thick color layer. However, the inventors found in actual production operations that due to the influence of the overall shape of the silver decorative border, the bottom shell is usually a frame-shaped structure with a relatively thin thickness and a long and thin shape. After injection-molding the bottom shell in the first shot and then injection-molding the color layer in the second shot, the hot melt slurry in the second shot will cause the plastic of the bottom shell to be in a state of being reheated due to its temperature, resulting in mutual penetration, diffusion, or color mixing of the injection-molded bottom shell and the color layer, seriously affecting the production reliability and production yield of the silver decorative border.

[0004] Therefore, it is necessary to study a new technical solution to solve the above problems. Summary of the Invention

[0005] In view of this, in view of the deficiencies existing in the prior art, the main purpose of the present invention is to provide a two-color injection mold for a silver decorative border of an automotive instrument panel, which effectively solves the technical defects of poor production reliability and low production yield existing in the two-color injection mold for injection-molding the silver decorative border of an automotive instrument panel in the prior art.

[0006] To achieve the above object, the present invention adopts the following technical solution: A two-color injection mold for a silver decorative border of an automotive instrument panel includes a first-shot station provided with a first-shot fixed mold, a second-shot station provided with a second-shot fixed mold, and two moving molds. The two moving molds can be cyclically switched to the first-shot station or the second-shot station. The first-shot fixed mold is provided with a first-shot mold core, the second-shot fixed mold is provided with a second-shot mold core, the moving mold includes a lower mold base, a lower mold core fixedly arranged on the lower mold base, a fixed core fixedly arranged on the lower mold base, and a movable core that can be installed on the lower mold base up and down and is located between the lower mold core and the core. After a first-shot fixed mold and a movable mold are clamped, the movable core moves upward by a first distance to form a first-shot cavity for molding the bottom shell together with a first-shot mold core and a lower mold core clamping perimeter; After a second-shot fixed mold and a movable mold are clamped, the movable core moves downward by a second distance to form a second-shot cavity for molding the color layer together with a second-shot mold core, a fixed core and a lower mold core clamping perimeter; before the second-shot injection molding, the movable core moves downward by a third distance to form an injection cavity together with the fixed core and the lower mold core, and the top of the injection cavity is connected to the bottom of the second-shot cavity in a conducting manner.

[0007] The beneficial effect of the two-color injection mold for the silver decorative border of the automotive instrument provided by the present invention is that, compared with the prior art, by arranging a lower mold core, a fixed core and a movable core on the movable mold, after the first-shot injection molding of the bottom shell, before the second-shot injection molding, the movable core can be driven to move downward by a third distance, so that the bottom of the second-shot cavity forms an injection cavity. After injecting the hot melt slurry for the second-shot injection into the injection cavity, the movable core moves upward to push the hot melt slurry in the injection cavity upward into the second-shot cavity for injection molding the color layer; thus, the problem that the color layer and the bottom shell penetrate, diffuse or mix with each other during the second-shot injection molding is solved, and the production reliability and production efficiency of the silver decorative border are improved.

[0008] As a preferred solution, the lower mold core is provided with a first-shot injection runner and a second-shot injection runner. One end of the first-shot injection runner penetrates through the side surface of the lower mold core and is connected to the first-shot cavity in a conducting manner. One end of the second-shot injection runner penetrates through the side surface of the lower mold core and is connected to the injection cavity in a conducting manner; The first-shot fixed mold is provided with a first-shot injection runner, and the first-shot injection runner is connected to the other end of the first-shot injection runner in a conducting manner; the second-shot fixed mold is provided with a second-shot injection runner, and the second-shot injection runner is connected to the other end of the second-shot injection runner in a conducting manner.

[0009] As a preferred solution, the first-shot injection runner includes a first-shot injection port, a first-shot manifold plate and a first-shot nozzle provided on the first-shot fixed mold. The first-shot manifold plate is provided with a first-shot diversion channel. One end of the first-shot diversion channel is connected to the first-shot injection port in a conducting manner. One end of the first-shot nozzle is connected to the other end of the first-shot diversion channel, and the other end of the first-shot nozzle is connected to the other end of the first-shot injection runner; The second-shot injection runner includes a second-shot injection port, a second-shot manifold plate and a second-shot nozzle provided on the second-shot fixed mold. The second-shot manifold plate is provided with a second-shot diversion channel. One end of the second-shot diversion channel is connected to the second-shot injection port in a conducting manner. One end of the second-shot nozzle is connected to the other end of the second-shot diversion channel, and the other end of the second-shot nozzle is connected to the other end of the second-shot injection runner.

[0010] As a preferred solution, the first-shot injection runner includes a first runner section and a second runner section. The first runner section penetrates through the upper surface of the lower mold core. One end of the second runner section is connected to one end of the first runner section in a conducting manner. The other end of the second runner section penetrates through the side surface of the first-shot cavity. The lower mold core is provided with a nozzle abutting concave position at the position where the first runner section is located; The two-shot injection runner includes a third runner section and a fourth runner section. The third runner section penetrates the upper surface of the lower mold core, one end of the fourth runner section is conductively connected to one end of the third runner section, and the other end of the fourth runner section penetrates the side surface of the injection cavity. The lower mold core is provided with a nozzle abutting concave position at the position where the third runner section is located.

[0011] As a preferred solution, the lower mold core is provided with a first installation position penetrating its upper and lower surfaces. The fixed core is fixedly installed in the lower mold base and located within the first installation position. The first installation opening and the second installation opening are formed by the fixed core and the lower mold core. The second installation opening is larger than the first installation opening. The movable core includes an upper main body portion and a lower limiting portion. The upper main body portion is vertically movable within the first installation opening, and the lower limiting portion is vertically movable within the second installation opening. The height of the lower limiting portion is less than the height of the second installation opening.

[0012] As a preferred solution, it further includes a first actuating cylinder. The telescopic rod of the first actuating cylinder can extend upward or retract downward, and the end of the telescopic rod is fixedly connected to the lower limiting portion.

[0013] As a preferred solution, after the movable core moves upward by a first distance and downward by a second distance, the upper main body portion can close the two-shot injection runner; after the movable core moves downward by a third distance, the top of the upper main body portion is located below the other end of the fourth runner section, so that the two-shot injection runner is conductively connected to the injection cavity.

[0014] As a preferred solution, it further includes an ejector insert. The ejector insert is vertically movable and installed in the lower mold core. The bottom of the ejector insert is connected to a first ejector rod, and the bottom of the first ejector rod is connected to a first ejector plate. The first ejector plate is vertically movable and installed in the lower mold base. The ejector insert has a molding surface facing the first-shot cavity. The molding surface is recessed with a snap cavity for molding the snap structure of the bottom shell.

[0015] The present invention also provides a two-color injection molding method for a silver decorative border of an automotive instrument, which is applied to a two-color injection molding die for a silver decorative border of an automotive instrument.

[0016] As a preferred solution, it includes the following steps: Step 1, install the first-shot fixed mold and the second-shot fixed mold on the injection molding machine, install the two movable molds on the injection molding machine, and drive the two movable molds to cycle and switch to the first-shot station or the second-shot station by the injection molding machine. Step 2, drive the movable mold at the first-shot station to close the mold with the first-shot fixed mold, and drive the movable core to move upward by a first distance, so that the movable core, the first-shot mold core and the lower mold core enclose the first-shot cavity. Step 3, inject the hot melt slurry into the first-shot cavity through the injection molding machine. After the injection of the hot melt slurry is completed, it is left stationary for 5S - 20S to form the bottom shell. Step 4: The moving mold and the first-shot fixed mold are opened, and the bottom shell is separated from the first-shot fixed mold. Step 5: The injection molding machine drives the moving mold at the first-shot station to move to the second-shot station, and the moving mold at the second-shot station moves to the first-shot station to perform the above Steps 2 - 4. Step 6: The moving mold at the second-shot station is closed with the second-shot fixed mold, and the movable core moves downward by a second distance, so that the fixed core, the movable core, the lower mold core, and the second-shot mold core are closed to form the second-shot cavity for molding the color layer. Step 7: Before the second-shot injection of glue, the movable core is driven to move downward by a third distance, so that the fixed core, the lower mold core, and the movable core enclose the glue injection cavity. Step 8: The hot melt slurry is injected into the glue injection cavity through the injection molding machine. After the injection of the hot melt slurry is completed, the movable core is driven to move upward to push the hot melt slurry in the glue injection cavity upward into the second-shot cavity and stay still for 5S - 20S, so that the color layer is formed on the surface of the bottom shell to injection mold the silver decorative border of the automotive instrument. Step 9: The moving mold and the second-shot fixed mold are opened, and the silver decorative border of the automotive instrument is ejected and unloaded. Step 10: Repeating Steps 2 - 9 can continuously injection mold the silver decorative border of the automotive instrument.

[0017] The beneficial effect of the two-color injection molding method for the silver decorative border of the automotive instrument provided by the present invention is that, compared with the prior art, before the second-shot injection molding of the color layer, the glue injection cavity is enclosed by driving the movable core to move downward by a third distance. After the hot melt slurry is injected into the glue injection cavity, the movable core is driven to move upward to push the hot melt slurry in the glue injection cavity upward into the second-shot cavity, and the color layer is injection molded on the surface of the bottom shell; it can solve the problem that the second-shot hot melt slurry reheats the bottom shell, so as to ensure that during the two-color injection molding of the bottom shell and the color layer, the bottom shell will not deform, and there will be no problems of mutual penetration, diffusion, or color mixing between the bottom shell and the color layer, thereby improving the production reliability and production yield of the silver decorative border. Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 It is a three-dimensional structural schematic diagram of a two-color injection mold for the silver decorative border of the automotive instrument provided by the embodiment of the present application; Figure 2 It is Figure 1 A three-dimensional structural schematic diagram of two moving molds of the two-color injection mold for the silver decorative border of the automotive instrument shown; Figure 3 Is Figure 2 An enlarged view of part A of the two moving molds of the two-color injection mold for the silver decorative border of the automotive instrument shown in the figure; Figure 4 Is Figure 2 An enlarged view of part B of the two moving molds of the two-color injection mold for the silver decorative border of the automotive instrument shown in the figure; Figure 5 Is Figure 1 A three-dimensional structural schematic diagram of the first-shot injection runner in the first-shot fixed mold of the two-color injection mold for the silver decorative border of the automotive instrument shown in the figure; Figure 6 Is Figure 1 A three-dimensional structural schematic diagram of the second-shot injection runner in the second-shot fixed mold of the two-color injection mold for the silver decorative border of the automotive instrument shown in the figure; Figure 7 Is Figure 1 A top view of the first-shot fixed mold and the moving mold of the two-color injection mold for the silver decorative border of the automotive instrument shown in the figure; Figure 8 Is Figure 7 A sectional view taken along line A-A of the first-shot fixed mold and the moving mold of the two-color injection mold for the silver decorative border of the automotive instrument shown in the figure; Figure 9 Is Figure 8 An enlarged view of part C of the first-shot fixed mold and the moving mold of the two-color injection mold for the silver decorative border of the automotive instrument shown in the figure; Figure 10 Is Figure 9 A partial structural schematic diagram of the bottom shell formed by injection molding of the first-shot fixed mold and the moving mold of the two-color injection mold for the silver decorative border of the automotive instrument shown in the figure; Figure 11 Is Figure 1 A three-dimensional structural schematic diagram of the second-shot fixed mold and the moving mold of the two-color injection mold for the silver decorative border of the automotive instrument shown in the figure; Figure 12 Is Figure 11 A sectional view taken along line B-B of the second-shot fixed mold and the moving mold of the two-color injection mold for the silver decorative border of the automotive instrument shown in the figure; Figure 13 Is Figure 12 An enlarged view of part D of the second-shot fixed mold and the moving mold of the two-color injection mold for the silver decorative border of the automotive instrument shown in the figure; Figure 14 Is Figure 13 An enlarged view of the local structure where the movable core moves downward to enclose the injection cavity of the two-color injection mold for the silver decorative border of the automotive instrument shown in the figure; Figure 15 Is Figure 13Partial structural schematic diagram at location E of the two-shot fixed mold and moving mold of the two-color injection mold for the silver decorative border of the automotive instrument, based on the injection molding of the color layer on the bottom shell; Figure 16 is Figure 1 Three-dimensional structural schematic diagram of the silver decorative border of the automotive instrument injection molded by the two-color injection mold of the silver decorative border of the automotive instrument shown; Figure 17 is Figure 16 First cross-sectional view of the silver decorative border of the automotive instrument shown.

[0020] Among them, each reference numeral in the figure: 100, two-color injection mold; 101, first-shot station; 102, second-shot station; 103, first-shot cavity; 104, second-shot cavity; 105, glue injection cavity; 10, first-shot fixed mold; 11, first-shot mold core; 12, first-shot glue injection runner; 121, first-shot glue injection port; 122, first-shot manifold; 123, first-shot nozzle; 20, second-shot fixed mold; 21, second-shot mold core; 13, second-shot glue injection runner; 131, second-shot glue injection port; 132, second-shot manifold; 133, second-shot nozzle; 30, moving mold; 31, lower mold base; 32, lower mold core; 321, first installation port; 322, second installation port; 33, fixed core; 34, movable core; 341, upper main body part; 342, lower limiting part; 343, first actuating cylinder; 35, first-shot feed runner; 351, first runner section; 352, second runner section; 36, second-shot feed runner; 361, third runner section; 362, fourth runner section; 37, nozzle abutting concave position; 38, ejector insert; 381, first ejector rod; 382, first ejector plate; 383, forming surface; 384, snap cavity; 200, silver decorative border of the automotive instrument; 2001, bottom shell; 2002, color layer; 2003, snap structure. Detailed implementation manners

[0021] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application clearer, the following further elaborates on this application in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not used to limit this application.

[0022] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0023] It should be understood that the orientation or positional relationship indicated by terms such as "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application.

[0024] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality of" means two or more unless otherwise specifically defined.

[0025] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the drawings and embodiments.

[0026] Please refer to Figures 1 to 17 , and now the two-color injection mold 100 for the silver decorative border 200 of the automotive instrument provided by the embodiment of the present application will be described. The two-color injection mold 100 for the silver decorative border 200 of the automotive instrument includes: a first-shot fixed mold 10, a second-shot fixed mold 20, and two movable molds 30.

[0027] The first-shot fixed mold 10 is installed at the first-shot station 101, and the second-shot fixed mold 20 is installed at the second-shot station 102. Two moving molds 30 can move cyclically between the first-shot station 101 and the second-shot station 102, so that the moving mold 30 is clamped with the corresponding first-shot fixed mold 10 or second-shot fixed mold 20. When the first-shot fixed mold 10 is clamped with the moving mold 30, the bottom shell 2001 can be injection-molded. When the moving mold 30 containing the bottom shell 2001 is transferred to the second-shot station 102 and clamped with the second-shot fixed mold 20, the color layer 2002 can be injection-molded on the surface of the bottom shell 2001. Among them, the first-shot fixed mold 10 is provided with a first-shot mold core 11, the second-shot fixed mold 20 is provided with a second-shot mold core 21, and the moving mold 30 includes a lower mold base 31, a lower mold core 32 fixedly arranged on the lower mold base 31, a fixed core 33 fixedly arranged on the lower mold base 31, and a movable core 34 that can be installed on the lower mold base 31 up and down and is located between the lower mold core 32 and the core. When the first-shot fixed mold 10 is clamped with the moving mold 30, the movable core 34 moves up a first distance to be clamped with the first-shot mold core 11 and the lower mold core 32 to form a first-shot cavity 103 for molding the bottom shell 2001. When the second-shot fixed mold 20 is clamped with the moving mold 30, the movable core 34 moves down a second distance to be clamped with the second-shot mold core 21, the fixed core 33, and the lower mold core 32 to form a second-shot cavity 104 for molding the color layer 2002. Before the second-shot injection, the movable core 34 moves down a third distance to form an injection cavity 105 with the fixed core 33 and the lower mold core 32. The top of the injection cavity 105 is connected to the bottom of the second-shot cavity 104 in a conducting manner.

[0028] Specifically, by arranging the lower mold core 32, the fixed core 33, and the movable core 34 on the moving mold 30, after the bottom shell 2001 is injection-molded in the first shot, before the second-shot injection, the movable core 34 is driven to move down a third distance, so that the bottom of the second-shot cavity 104 forms an injection cavity 105. After injecting the hot-melt slurry for the second-shot injection into the injection cavity 105, the movable core 34 moves up to push the hot-melt slurry in the injection cavity 105 upward into the second-shot cavity 104 for injection-molding the color layer 2002. Thus, the problem that the color layer 2002 and the bottom shell 2001 penetrate, diffuse, or mix with each other during the second-shot injection is solved, and the production reliability and production efficiency of the silver decorative frame are improved.

[0029] In some embodiments, the lower mold core 32 is provided with a first-shot feed runner 35 and a second-shot feed runner 36. One end of the first-shot feed runner 35 penetrates the side surface of the lower mold core 32 and is connected to the first-shot cavity 103 in a conducting manner. One end of the second-shot feed runner 36 penetrates the side surface of the lower mold core 32 and is connected to the injection cavity 105 in a conducting manner. The first-shot fixed mold 10 is provided with a first-shot injection runner 12, and the first-shot injection runner 12 is connected to the other end of the first-shot feed runner 35 in a conducting manner. The second-shot fixed mold 20 is provided with a second-shot injection runner 13, and the second-shot injection runner 13 is connected to the other end of the second-shot feed runner 36 in a conducting manner.

[0030] Specifically, a first-shot injection runner 12 includes a first-shot injection port 121, a first-shot manifold 122, and a first-shot nozzle 123 provided in a first-shot fixed mold 10. The first-shot manifold 122 is provided with a first-shot diversion channel (not shown in the figure). One end of the first-shot diversion channel is conductively connected to the first-shot injection port 121. One end of the first-shot nozzle 123 is conductively connected to the other end of the first-shot diversion channel. The other end of the first-shot nozzle 123 is conductively connected to the other end of the first-shot injection runner 12. The second-shot injection runner 13 includes a second-shot injection port 131, a second-shot manifold 132, and a second-shot nozzle 133 provided in a second-shot fixed mold 20. The second-shot manifold 132 is provided with a second-shot diversion channel (not shown in the figure). One end of the second-shot diversion channel is conductively connected to the second-shot injection port 131. One end of the second-shot nozzle 133 is conductively connected to the other end of the second-shot diversion channel. The other end of the second-shot nozzle 133 is conductively connected to the other end of the second-shot injection runner 13.

[0031] Since the overall structure of the silver decorative frame 200 of the automotive instrument is a slender and thin frame structure, when injection molding the bottom shell 2001 in the first shot and the color layer 2002 in the second shot, the four-corner injection process is preferably adopted, which can improve the injection efficiency. Specifically, there are four first-shot feed runners 35. The four first-shot feed runners 35 are conductively connected to the four corners of the first-shot cavity 103 one by one. The first-shot manifold 122 is provided with four first-shot diversion channels. A first-shot nozzle 123 is provided at the end of each first-shot diversion channel, that is, four first-shot nozzles 123. After the first-shot fixed mold 10 and the moving mold 30 are clamped, one first-shot nozzle 123 can be conductively connected to one first-shot feed runner 35, so as to inject the hot melt slurry from the first-shot injection port 121, flow through the first-shot diversion channel and the first-shot nozzle 123, and input from the four corners of the first-shot cavity 103. There are four second-shot feed runners 36. The four second-shot feed runners 36 are conductively connected to the four corners of the second-shot cavity 104 one by one. The second-shot manifold 132 is provided with four second-shot diversion channels. A second-shot nozzle 133 is provided at the end of each second-shot diversion channel, that is, four second-shot nozzles 133. After the second-shot fixed mold 20 and the moving mold 30 are clamped, one second-shot nozzle 133 can be conductively connected to one second-shot feed runner 36, so as to inject the hot melt slurry from the second-shot injection port 131, flow through the second-shot diversion channel and the second-shot nozzle 133, and inject into the injection cavity 105 from the four corners of the injection cavity 105.

[0032] It can be understood that at least when injecting in the first shot and the second shot, the colors of the hot melt slurries are different. For example, the hot melt slurry for the first-shot injection is black, and the hot melt slurry for the second-shot injection is silver, so as to injection mold the silver decorative frame 200 of the automotive instrument. In addition, different plastic slurries can also be set for the hot melt slurries of the first-shot injection and the second-shot injection.

[0033] More specifically, a first injection runner 35 includes a first runner segment 351 and a second runner segment 352. The first runner segment 351 penetrates the upper surface of the lower mold core 32. One end of the second runner segment 352 is conductively connected to one end of the first runner segment 351, and the other end of the second runner segment 352 penetrates the side surface of the first injection cavity 103. The lower mold core 32 is provided with a nozzle abutting recess 37 at the position where the first runner segment 351 is located. The second injection runner 36 includes a third runner segment 361 and a fourth runner segment 362. The third runner segment 361 penetrates the upper surface of the lower mold core 32. One end of the fourth runner segment 362 is conductively connected to one end of the third runner segment 361, and the other end of the fourth runner segment 362 penetrates the side surface of the injection cavity 105. The lower mold core 32 is provided with a nozzle abutting recess 37 at the position where the third runner segment 361 is located.

[0034] Preferably, the other end of the second runner segment 352 is lower than one end of the second runner segment 352, so that the entire second runner segment 352 is inclined, and the direction of the hot melt slurry injected into the first injection cavity 103 is obliquely injected. This structure can reduce the generation of bubbles during the injection process of the hot melt slurry, thereby improving the fullness of the injection molded bottom shell 2001 and preventing the appearance of air holes. The other end of the fourth runner segment 362 is lower than one end of the fourth runner segment 362, so that the entire fourth runner segment 362 is inclined, and the other end of the fourth runner segment 362 is lower than the other end of the second runner segment 352, so that the other end of the fourth runner segment 362 can be conductively connected to the injection cavity 105, rather than directly conductively connecting the first injection cavity 103 and the second injection cavity 104.

[0035] In some other embodiments, the lower mold core 32 is provided with a first installation position penetrating its upper and lower surfaces. The fixed core 33 is fixedly installed in the lower mold base 31 and located within the first installation position. The fixed core 33 and the lower mold core 32 enclose a first installation opening 321 and a second installation opening 322. The second installation opening 322 is larger than the first installation opening 321. The movable core 34 includes an upper main body portion 341 and a lower limiting portion 342. The upper main body portion 341 is vertically movable in the first installation opening 321, and the lower limiting portion 342 is vertically movable in the second installation opening 322. The height of the lower limiting portion 342 is less than the height of the second installation opening 322.

[0036] Specifically, by providing a first actuating cylinder 343, the telescopic rod of the first actuating cylinder 343 can extend upward or retract downward, and the end of the telescopic rod is fixedly connected to the lower limiting portion 342. With such a structure, the telescopic rod of the first actuating cylinder 343 can be telescoped to control the vertical movement of the movable core 34.

[0037] Preferably, since the movable core 34 is based on the shape of the injection-molded silver decorative frame 200 of the automotive instrument, the overall shape of the movable core 34 is an annular structure, that is, the bottoms of the entire first injection cavity 103 and the second injection cavity 104 are both surrounded by the movable core 34. Therefore, there are four first actuating cylinders 343, which are respectively arranged at the four corners corresponding to the movable core 34. By simultaneously controlling the telescopic rods of the four first actuating cylinders 343 to move up and down, the movable core 34 is driven to move up and down. The driving force is balanced, which is beneficial to improving the reliability of the up and down telescoping of the movable core 34.

[0038] It can be understood that after the movable core 34 moves up by the first distance and moves down by the second distance, the upper main body 341 can close the second injection runner 36; after the movable core 34 moves down by the third distance, the top of the upper main body 341 is located below the other end of the fourth runner section 362, so that the second injection runner 36 is connected to the injection cavity 105 in a conductive manner. During the first injection process, the movable core 34 moves up by the first distance. The first injection cavity 103 is surrounded by the movable core 34, the first injection mold core 11 and the lower mold core 32 and the second injection runner 13 is closed, so as to ensure that during the first injection process, the hot melt slurry will not enter the second injection; only after the movable core 34 moves down by the third distance, the second injection runner 13 can be connected to the injection cavity 105 in a conductive manner, so that the second injection hot melt slurry is injected into the injection cavity 105.

[0039] It should be noted here that the injection cavity 105 is actually the position of the first mounting port 321. After the movable core 34 moves down by the third distance, the injection cavity 105 is surrounded by the fixed core 33, the movable core 34 and the lower mold core 32.

[0040] In some embodiments, it further includes an ejector insert 38. The ejector insert 38 is movably mounted on the lower mold core 32 up and down. A first ejector rod 381 is connected to the bottom of the ejector insert 38. The bottom of the first ejector rod 381 is connected to a first ejector plate 382. The first ejector plate 382 is movably mounted on the lower mold base 31 up and down; the ejector insert 38 has a molding surface 383 facing the first injection cavity 103, and a buckle cavity 384 is recessed in the molding surface 383. The buckle cavity 384 is used for molding the buckle structure 2003 of the bottom shell 2001.

[0041] Moreover, the moving mold 30 is also provided with a second ejector plate that can move up and down. The second ejector plate is provided with a plurality of second ejector pins. The plurality of second ejector pins can extend upward into the second injection cavity 104. When the second injection molding of the color layer 2002 is completed, the silver decorative frame 200 of the automotive instrument can be ejected by the second ejector pins and the ejector insert 38 to complete the blanking of the silver decorative frame 200 of the automotive instrument.

[0042] It should be noted here that the first-shot fixed mold, the second-shot fixed mold and the moving mold are also provided with cooling channels and heating channels, which are used to control the temperatures of the first-shot mold core, the second-shot mold core and the lower mold core during the process of assisting in injection molding the bottom shell and the color layer, so as to improve the efficiency of injection molding the bottom shell and the color layer. Moreover, the first-shot fixed mold, the second-shot fixed mold and the moving mold are provided with exhaust channels, which are used to exhaust the first-shot cavity and the second-shot cavity during the process of injecting the hot-melt slurry. These are conventional design means for those skilled in the art of two-color injection molds and will not be elaborated here one by one.

[0043] The present invention also provides a two-color injection molding method for the silver decorative border 200 of an automotive instrument, which is applied to the two-color injection mold 100 for the silver decorative border 200 of an automotive instrument. The two-color injection molding method includes the following steps: Step 1: Install the first-shot fixed mold 10 and the second-shot fixed mold 20 on an injection molding machine, install the two moving molds 30 on the injection molding machine, and drive the two moving molds 30 to cyclically switch to the first-shot station 101 or the second-shot station 102 by the injection molding machine. Step 2: Drive the moving mold 30 at the first-shot station 101 to close the mold with the first-shot fixed mold 10, and drive the movable core 34 to move upward by a first distance, so that the movable core 34, the first-shot mold core 11 and the lower mold core 32 enclose the first-shot cavity 103. Step 3: Inject the hot-melt slurry into the first-shot cavity 103 through the injection molding machine. After the injection of the hot-melt slurry is completed, it is left stationary for 5S - 20S to form the bottom shell 2001. Step 4: Open the mold between the moving mold 30 and the first-shot fixed mold 10, and separate the bottom shell 2001 from the first-shot fixed mold 10. Step 5: The injection molding machine drives the moving mold 30 at the first-shot station 101 to move to the second-shot station 102, and the moving mold 30 at the second-shot station 102 moves to the first-shot station 101 to perform the above steps 2 - step 4. Step 6: The moving mold 30 at the second-shot station 102 closes the mold with the second-shot fixed mold 20, and the movable core 34 moves downward by a second distance, so that the movable core 34, the fixed core 33, the lower mold core 32 and the second-shot mold core 21 are closed to enclose the second-shot cavity 104 for forming the color layer 2002. Step 7: Before the second-shot injection, drive the movable core 34 to move downward by a third distance, so that the fixed core 33, the lower mold core 32 and the movable core 34 enclose the injection cavity 105. Step 8: Inject the hot-melt slurry into the injection cavity 105 through the injection molding machine. After the injection of the hot-melt slurry is completed, drive the movable core 34 to move upward, push the hot-melt slurry located in the injection cavity 105 upward into the second-shot cavity 104 and leave it stationary for 5S - 20S, so that the color layer 2002 is formed on the surface of the bottom shell 2001 to injection mold the silver decorative border 200 of the automotive instrument. Step 9: Open the mold between the moving mold 30 and the second-shot fixed mold 20, and eject and unload the silver decorative border 200 of the automotive instrument. Step 10, repeating steps 2 to 9 can continuously injection mold the silver decorative frame 200 of the automobile instrument.

[0044] Specifically, before performing the second-shot injection molding of the color layer 2002, the movable core 34 is moved down a third distance to enclose the injection cavity 105, and after the hot melt slurry is injected into the injection cavity 105, the movable core 34 is moved up to push the hot melt slurry in the injection cavity 105 into the second-shot cavity 104, thereby completing the injection molding of the color layer 2002 on the surface of the bottom shell 2001; this can solve the problem of the second-shot hot melt slurry heating the bottom shell 2001 again, thereby ensuring that during the two-color injection molding of the bottom shell 2001 and the color layer 2002, the bottom shell 2001 will not be deformed, and there will be no mutual penetration, diffusion or color mixing between the bottom shell 2001 and the color layer 2002, thereby improving the production reliability and production yield of the silver decorative frame; at the same time, by pushing the hot melt slurry up through the movable core into the second-shot cavity, the flow reliability of the hot melt slurry can be improved, and the color layer molding can be more uniform without defects such as bubbles.

[0045] It should be noted here that the movable core 34 moves down the second distance based on the movable core 34 moving down the second distance after completing the first distance upward movement, and the movable core 34 moves down the third distance based on the movable core 34 moving up the third distance after completing the second distance downward movement. When the movable core 34 moves up to push the hot melt slurry in the injection cavity 105 to the second-shot cavity 104, the movable core 34 cancels the stroke of moving down the third distance, and restores it to the next second distance state, so that the two-shot mold core 21, the lower mold core 32, the fixed core 33 and the movable core 34 surround the two-shot cavity 104, and at this time the two-shot cavity 104 contains the bottom shell 2001 molded by one shot, so that the color layer 2002 molded by the two-shot injection can be integrated with the bottom shell 2001.

[0046] The above are only preferred embodiments of the present invention, and only specifically describe the technical principles of the present invention. These descriptions are only for explaining the principles of the present invention and cannot be interpreted as limiting the scope of protection of the present invention in any way. Based on the explanations here, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention, and other specific implementations of the present invention that can be associated with by technicians in this field without creative labor, should be included in the scope of protection of the present invention.

Claims

1. A two-color injection mold for a silver decorative border of an automotive instrument, comprising a first-shot station (101) provided with a first-shot fixed mold (10), a second-shot station (102) provided with a second-shot fixed mold (20), and two movable molds (30), and the two movable molds (30) can be cyclically switched to the first-shot station (101) or the second-shot station (102); characterized in that, The first-shot fixed mold (10) is provided with a first-shot mold core (11), the second-shot fixed mold (20) is provided with a second-shot mold core (21), and the movable mold (30) includes a lower mold base (31), a lower mold core (32) fixedly arranged on the lower mold base (31), a fixed core (33) fixedly arranged on the lower mold base (31), and a movable core (34) that can be installed on the lower mold base (31) to move up and down and is located between the lower mold core (32) and the core; After the first-shot fixed mold (10) and the movable mold (30) are clamped, the movable core (34) moves up a first distance to be clamped with the first-shot mold core (11) and the lower mold core (32) to form a first-shot cavity (103) for molding the bottom shell (2001); After the second-shot fixed mold (20) and the movable mold (30) are clamped, the movable core (34) moves down a second distance to be clamped with the second-shot mold core (21), the fixed core (33) and the lower mold core (32) to form a second-shot cavity (104) for molding the color layer (2002); before the second-shot injection molding, the movable core (34) moves down a third distance to enclose and form an injection cavity (105) with the fixed core (33) and the lower mold core (32), and the top of the injection cavity (105) is connected to the bottom of the second-shot cavity (104) in a conducting manner.

2. The two-color injection mold for the silver decorative border of an automotive instrument, characterized in that, The lower mold core (32) is provided with a first-shot injection runner (35) and a second-shot injection runner (36), one end of the first-shot injection runner (35) penetrates the side surface of the lower mold core (32) and is connected to the first-shot cavity (103) in a conducting manner, and one end of the second-shot injection runner (36) penetrates the side surface of the lower mold core (32) and is connected to the injection cavity (105) in a conducting manner; The first-shot fixed mold (10) is provided with a first-shot injection runner (12), and the first-shot injection runner (12) is connected to the other end of the first-shot injection runner (35) in a conducting manner; the second-shot fixed mold (20) is provided with a second-shot injection runner (13), and the second-shot injection runner (13) is connected to the other end of the second-shot injection runner (36) in a conducting manner.

3. The two-color injection mold for the silver decorative border of the automotive instrument according to claim 2, characterized in that, The first-shot injection runner (12) includes a first-shot injection port (121), a first-shot manifold plate (122) and a first-shot nozzle (123) arranged on the first-shot fixed mold (10), the first-shot manifold plate (122) is provided with a first-shot diversion channel, one end of the first-shot diversion channel is connected to the first-shot injection port (121) in a conducting manner, one end of the first-shot nozzle (123) is connected to the other end of the first-shot diversion channel in a conducting manner, and the other end of the first-shot nozzle (123) is connected to the other end of the first-shot injection runner (12); The two-shot injection runner (13) includes a two-shot injection port (131), a two-shot manifold (132), and a two-shot nozzle (133) provided in the two-shot fixed mold (20). The two-shot manifold (132) is provided with two-shot diversion channels. One end of the two-shot diversion channels is conductively connected to the two-shot injection port (131). One end of the two-shot nozzle (133) is conductively connected to the other end of the two-shot diversion channels. The other end of the two-shot nozzle (133) is conductively connected to the other end of the two-shot injection runner (13).

4. The two-color injection mold for the silver decorative border of the automotive instrument according to claim 3, wherein, The first-shot injection runner (35) includes a first runner section (351) and a second runner section (352). The first runner section (351) penetrates the upper surface of the lower mold core (32). One end of the second runner section (352) is conductively connected to one end of the first runner section (351). The other end of the second runner section (352) penetrates the side surface of the first-shot cavity (103). The lower mold core (32) is provided with a nozzle abutting recess (37) at the position where the first runner section (351) is located; The second-shot injection runner (36) includes a third runner section (361) and a fourth runner section (362). The third runner section (361) penetrates the upper surface of the lower mold core (32). One end of the fourth runner section (362) is conductively connected to one end of the third runner section (361). The other end of the fourth runner section (362) penetrates the side surface of the injection cavity (105). The lower mold core (32) is provided with a nozzle abutting recess (37) at the position where the third runner section (361) is located.

5. The two-color injection mold for the silver decorative border of the automotive instrument according to any one of claims 1-4, characterized in that, The lower mold core (32) is provided with a first installation position penetrating its upper and lower surfaces. The fixed core (33) is fixedly installed in the lower mold base (31) and located within the first installation position. The first installation port (321) and the second installation port (322) are surrounded by the fixed core (33) and the lower mold core (32). The second installation port (322) is larger than the first installation port (321); The movable core (34) includes an upper main body portion (341) and a lower limiting portion (342). The upper main body portion (341) is vertically movable within the first installation port (321). The lower limiting portion (342) is vertically movable within the second installation port (322). The height of the lower limiting portion (342) is less than the height of the second installation port (322).

6. The two-color injection mold for the silver decorative border of an automotive instrument, characterized in that, It further includes a first actuating cylinder (343). The telescopic rod of the first actuating cylinder (343) can extend upward or retract downward. The end of the telescopic rod is fixedly connected to the lower limiting portion (342).

7. The two-color injection mold for the silver decorative border of the automotive instrument according to claim 5, characterized in that, After the movable core (34) moves upward by a first distance and downward by a second distance, the upper main body portion (341) can close the second-shot injection runner (35); after the movable core (34) moves downward by a third distance, the top of the upper main body portion (341) is located below the other end of the fourth runner section (362), enabling the second-shot injection runner (35) to be conductively connected to the injection cavity (105).

8. The two-color injection mold for the silver decorative border of the automotive instrument according to claim 1 or 2 or 3 or 4 or 6 or 7, characterized in that, It further includes an ejector insert (38). The ejector insert (38) is vertically movable and installed in the lower mold core (32). The bottom of the ejector insert (38) is connected to a first ejector rod (381). The bottom of the first ejector rod (381) is connected to a first ejector plate (382). The first ejector plate (382) is vertically movable and installed in the lower mold base (31); The ejection insert (38) has a molding surface (383) facing a first-shot cavity (103). The molding surface (383) is recessed with a snap cavity (384) for molding the snap structure (2003) of the bottom shell (2001).

9. A two-color injection molding method for a silver decorative border of an automotive instrument, characterized in that, A two-color injection mold for the silver decorative border of an automotive instrument as described in any one of claims 1-8.

10. The two-color injection molding method for the silver decorative border of an automotive instrument, characterized in that, Comprising the following steps: Step 1: Install the first-shot fixed mold (10) and the second-shot fixed mold (20) on the injection molding machine. Install the two moving molds (30) on the injection molding machine and drive the two moving molds (30) to cycle and switch to the first-shot station (101) or the second-shot station (102) by the injection molding machine; Step 2: Drive the moving mold (30) at the first-shot station (101) to close with the first-shot fixed mold (10), and drive the movable core (34) to move up a first distance so that the movable core (34), the first-shot mold core (11), and the lower mold core (32) enclose the first-shot cavity (103); Step 3: Inject hot melt slurry into the first-shot cavity (103) through the injection molding machine. After the hot melt slurry injection is completed, it stands still for 5S - 20S to form the bottom shell (2001); Step 4: Open the moving mold (30) and the first-shot fixed mold (10), and separate the bottom shell (2001) from the first-shot fixed mold (10); Step 5: The injection molding machine drives the moving mold (30) at the first-shot station (101) to move to the second-shot station (102), and the moving mold (30) at the second-shot station (102) moves to the first-shot station (101) to perform the above steps 2 - step 4; Step 6: The moving mold (30) at the second-shot station (102) closes with the second-shot fixed mold (20), and the movable core (34) moves down a second distance so that the fixed core (33), the movable core (34), the lower mold core (32), and the second-shot mold core (21) close to enclose the second-shot cavity (104) for molding the color layer (2002); Step 7: Before the second-shot injection, drive the movable core (34) to move down a third distance so that the fixed core (33), the lower mold core (32), and the movable core (34) enclose the injection cavity (105); Step 8: Inject hot melt slurry into the injection cavity (105) through the injection molding machine. After the hot melt slurry injection is completed, drive the movable core (34) to move up, push the hot melt slurry in the injection cavity (105) upward into the second-shot cavity (104) and stand still for 5S - 20S, so that the color layer (2002) is formed on the surface of the bottom shell (2001) to injection mold the silver decorative border (200) of the automotive instrument; Step 9: Open the moving mold (30) and the second-shot fixed mold (20), and eject and unload the silver decorative border (200) of the automotive instrument; Step 10: Repeating steps 2 - step 9 can continuously injection mold the silver decorative border (200) of the automotive instrument.

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