Two-color injection mold and two-color injection method for silver decorative frame of automobile instrument

Abstract

The present application relates to the technical field of two-color injection mold, especially to a two-color injection mold for silver decorative frame of automobile instrument, which comprises a first fixed mold, a second fixed mold and two movable molds, when the first fixed mold and the movable mold are combined, the movable core moves up by a first distance to combine with the first mold core and the lower mold core to form a first cavity of the bottom shell; when the second fixed mold and the movable mold are combined, the movable core moves down by a second distance to combine with the second mold core and the lower mold core to form a second cavity of the color layer; before the second injection, the movable core moves down by a third distance to combine with the fixed core and the lower mold core to form an injection cavity, and the top of the injection cavity is connected with the bottom of the second cavity. The present application also provides a two-color injection method for the silver decorative frame of automobile instrument. Compared with the prior art, the present application can solve the problem of mutual penetration, diffusion or color mixing between the color layer and the bottom shell.

Description

Technical Field

[0001] This invention relates to the field of two-color injection mold technology, and in particular to a two-color injection mold and a two-color injection method for a silver decorative border for an automotive instrument panel. Background Technology

[0002] In related technologies, the silver trim bezel of automotive instrument panels typically has a base and a color layer attached to the surface of the base. The base is snapped onto the dashboard of the car, making the color layer visible.

[0003] In actual production operations, the inventors mainly employ the following two manufacturing processes for silver decorative borders:

[0004] The first method involves injection molding the bottom shell using an injection mold, and then spraying a color layer onto the surface of the bottom shell. The drawback of this manufacturing process is that it is time-consuming and the color layer is relatively thin, making it prone to paint peeling after prolonged use. This method has been gradually abandoned.

[0005] The second method involves injection molding using a two-color injection mold. First, the base shell is injection molded, and then the color layer is injection molded in the second shot. This process can produce a thicker color layer. However, the inventors found in actual production that, due to the overall shape of the silver decorative frame, the base shell is usually a thin and elongated frame structure. After the base shell is injection molded in the first shot, the second shot of hot melt paste will cause the plastic of the base shell to be reheated due to its temperature. This results in the injection-molded base shell and color layer penetrating, diffusing, or mixing colors, which seriously affects the production reliability and yield of the silver decorative frame.

[0006] Therefore, a new technical solution needs to be researched to address the above problems. Summary of the Invention

[0007] In view of this, the present invention addresses the deficiencies of the existing technology, and its main objective is to provide a two-color injection mold for a silver decorative border of an automotive instrument panel, effectively solving the technical defects of poor production reliability and low production yield in the existing two-color injection molds used for injection molding silver decorative borders of automotive instrument panels.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: a two-color injection mold for a silver decorative border of an automotive instrument panel, comprising a first injection station with a fixed injection mold, a second injection station with a fixed injection mold, and two moving molds, the two moving molds being able to cyclically switch between the first injection station and the second injection station;

[0009] 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, and the moving mold includes a lower mold base, a lower mold core fixedly provided on the lower mold base, a fixed core fixedly provided on the lower mold base, and a movable core that can be moved up and down and installed on the lower mold base and located between the lower mold core and the mold core.

[0010] After the fixed mold and the moving mold are closed, the movable core moves up a first distance and closes with the mold core and the lower mold core to form the mold cavity of the bottom shell.

[0011] After the fixed mold and the moving mold of the second injection are closed, the movable core moves down a second distance and closes with the second injection mold core, the fixed core and the lower mold core to form the second injection cavity of the molding color layer; before the second injection is performed, the movable core moves down a third distance and closes with the fixed core and the lower mold core to form the injection cavity, and the top of the injection cavity is connected to the bottom of the second injection cavity.

[0012] The beneficial effect of the two-color injection mold for the silver decorative border of automotive instruments provided by this invention is that, compared with the prior art, by setting the lower mold core, fixed core and movable core in the moving mold, after the first injection molding of the bottom shell and before the second injection molding, the movable core can be driven to move down a third distance, so that the bottom of the second injection cavity forms an injection cavity. After the hot melt slurry of the second injection is injected into the injection cavity, the hot melt slurry in the injection cavity is pushed upward by the movable core to the second injection cavity for injection molding of the color layer. This solves the problem of mutual penetration, diffusion or color mixing between the color layer and the bottom shell during the second injection molding, and improves the production reliability and production efficiency of the silver decorative border.

[0013] As a preferred embodiment, the lower mold core is provided with one injection runner and two injection runners. One end of the injection runner penetrates the side of the lower mold core and is connected to an injection cavity. One end of the two injection runners penetrates the side of the lower mold core and is connected to an injection cavity.

[0014] The first injection mold has a first injection runner, which is connected to the other end of the first injection runner; the second injection mold has a second injection runner, which is connected to the other end of the second injection runner.

[0015] As a preferred embodiment, the injection runner includes an injection port, an injection manifold, and an injection nozzle located in the injection mold. The injection manifold has an injection flow channel, one end of which is connected to the injection port, one end of which is connected to the other end of the injection flow channel, and the other end of which is connected to the other end of the injection runner.

[0016] The two-shot injection runner includes a two-shot injection port, a two-shot manifold, and a two-shot nozzle located in the two-shot mold. The two-shot manifold has a two-shot flow channel. One end of the two-shot flow channel is connected to the two-shot injection port, one end of the two-shot nozzle is connected to the other end of the two-shot flow channel, and the other end of the two-shot nozzle is connected to the other end of the two-shot injection runner.

[0017] As a preferred embodiment, an injection runner includes a first runner section and a second runner section. The first runner section penetrates 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, and the other end of the second runner section penetrates the side of the injection cavity. The lower mold core is provided with a nozzle abutting recess at the location of the first runner section.

[0018] The two-stage 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 connected to one end of the third runner section. The other end of the fourth runner section penetrates the side of the injection cavity. The lower mold core has a nozzle abutment recess at the location of the third runner section.

[0019] As a preferred embodiment, the lower mold core is provided with a first mounting position that extends through its upper and lower surfaces. The fixed core is fixedly installed on the lower mold base and located within the first mounting position. The fixed core and the lower mold core together form a first mounting opening and a second mounting opening, with the second mounting opening being larger than the first mounting opening.

[0020] The movable core includes an upper main body and a lower limiting part. The upper main body can move up and down and is located at a first mounting port. The lower limiting part can move up and down and is located at a second mounting port. The height of the lower limiting part is less than the height of the second mounting port.

[0021] As a preferred embodiment, it also includes a first actuating cylinder, the telescopic rod of which can extend upward or retract downward, and the end of the telescopic rod is fixedly connected to the lower limiting part.

[0022] As a preferred embodiment, after the movable core moves up a first distance and down a second distance, the upper main body can close the two injection channels; after the movable core moves down a third distance, the top of the upper main body is located below the other end of the fourth channel section, so that the two injection channels are connected to the injection cavity.

[0023] As a preferred embodiment, it also includes an ejector insert, which is movable up and down and installed on 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 movable up and down and installed on the lower mold base.

[0024] The ejector insert has a forming surface facing the injection cavity, and the forming surface is recessed with a snap-fit ​​cavity, which is used to form the snap-fit ​​structure of the bottom shell.

[0025] The present invention also provides a two-color injection molding method for a silver decorative border of an automotive instrument panel, which is applied to a two-color injection mold for the silver decorative border of an automotive instrument panel.

[0026] As a preferred embodiment, the following steps are included:

[0027] Step 1: Install the first-shot fixed mold and the second-shot fixed mold on the injection molding machine, and install the two moving molds on the injection molding machine and drive the two moving molds to cycle between the first-shot station and the second-shot station.

[0028] Step 2: Drive the moving mold of the first injection station to close with the fixed mold of the first injection station, and drive the movable core to move up a first distance, so that the movable core, the first injection mold core and the lower mold core form the first injection cavity;

[0029] Step 3: Inject hot melt slurry into the injection cavity using an injection molding machine. After the hot melt slurry is injected, let it stand for 5-20 seconds to form the bottom shell.

[0030] Step 4: The moving mold and the first injection mold open, and the bottom shell is separated from the first injection mold;

[0031] Step 5: The injection molding machine drives the moving mold of the first injection station to move to the second injection station, and the moving mold of the second injection station moves to the first injection station to perform the above steps 2-4.

[0032] Step 6: The moving mold and the fixed mold of the second injection station are closed, and the movable core is moved down by a second distance so that the fixed core, the movable core, the lower mold core and the second injection mold core are closed to form the second injection cavity of the molding color layer.

[0033] Step 7: Before the second injection, drive the movable core to move down a third distance so that the fixed core, lower mold core and movable core form the injection cavity;

[0034] Step 8: Inject hot melt paste into the injection cavity using the injection molding machine. After the hot melt paste is injected, drive the movable core to move upward, push the hot melt paste in the injection cavity upward into the second injection cavity and hold for 5-20 seconds, so that the color layer is formed on the surface of the bottom shell to injection mold the silver decorative border of the car instrument panel.

[0035] Step 9: Open the moving mold and the two-shot fixed mold, and eject the silver decorative frame of the car instrument panel.

[0036] Step 10, repeating steps 2-9, can continuously injection mold the silver decorative border of the car dashboard.

[0037] The beneficial effects of the two-color injection molding method for the silver decorative bezel of automotive instrument panels provided by this invention are as follows: Compared with the prior art, before performing the two-shot injection molding of the color layer, the hot melt paste is injected into the injection cavity by moving the movable core down a third distance. Then, the hot melt paste in the injection cavity is pushed up into the two-shot cavity by moving the movable core up, thus completing the injection molding of the color layer on the bottom shell surface. This solves the problem of the hot melt paste reheating the bottom shell during the two-shot injection molding process, thereby ensuring that the bottom shell will not deform during the two-color injection molding of the bottom shell and the color layer, and that there will be no mutual penetration, diffusion, or color mixing between the bottom shell and the color layer. This improves the production reliability and yield of the silver decorative bezel. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This is a three-dimensional structural schematic diagram of the two-color injection mold for the silver decorative border of an automotive instrument panel provided in the embodiments of this application;

[0040] Figure 2 yes Figure 1 The diagram shows a three-dimensional structure of the two moving molds of the two-color injection mold for the silver decorative border of an automotive instrument panel.

[0041] Figure 3 yes Figure 2 The enlarged view of point A on the two moving molds of the two-color injection mold for the silver decorative border of the car instrument panel shown;

[0042] Figure 4 yes Figure 2 The enlarged view of point B of the two moving molds of the two-color injection mold for the silver decorative border of the car instrument panel shown;

[0043] Figure 5 yes Figure 1 The diagram shows a three-dimensional structure of the injection runner in the first injection mold of the two-color injection mold for the silver decorative border of the car instrument panel.

[0044] Figure 6 yes Figure 1 The diagram shows a three-dimensional structure of the two-shot injection channel in the two-shot fixed mold of the two-color injection mold for the silver decorative border of the car instrument panel.

[0045] Figure 7 yes Figure 1 The top view of the fixed mold and moving mold of the two-color injection mold for the silver trim bezel of the car instrument panel shown;

[0046] Figure 8 yes Figure 7 The cross-sectional view at point AA of the two-color injection mold for the silver decorative border of the car instrument panel shown.

[0047] Figure 9 yes Figure 8 The enlarged view of part C of the two-color injection mold for the silver decorative border of the car instrument panel.

[0048] Figure 10 yes Figure 9 The diagram shows a partial structural diagram of the two-color injection mold for the silver decorative border of an automotive instrument panel, illustrating the injection molding of the base shell using a fixed mold and a moving mold.

[0049] Figure 11 yes Figure 1 The diagram shows a three-dimensional structure of the two-color injection mold for the silver decorative border of an automotive instrument panel, consisting of a fixed mold and a moving mold.

[0050] Figure 12 yes Figure 11 The image shows a cross-sectional view at the BB section of the two-color injection mold for the silver trim bezel of an automotive instrument panel.

[0051] Figure 13 yes Figure 12 The enlarged view of part D of the two-color injection mold for the silver decorative border of the car instrument panel.

[0052] Figure 14 yes Figure 13 A magnified view of a portion of the injection cavity formed by the downward movement of the movable core of the two-color injection mold for the silver decorative border of the car instrument panel.

[0053] Figure 15 yes Figure 13 The diagram shows a partial structural diagram of the two-color injection mold for the silver decorative border of the car instrument panel, with the fixed mold and moving mold based on the injection molding of the color layer at point E of the bottom shell.

[0054] Figure 16 yes Figure 1 The diagram shows a three-dimensional structure of the silver decorative border of a car instrument panel, which is injection molded using a two-color injection mold.

[0055] Figure 17 yes Figure 16 The first cross-sectional view of the silver trim bezel of the car's instrument panel shown.

[0056] The following are the labeling elements in the figure:

[0057] 100. Two-color injection mold; 101. First-shot station; 102. Second-shot station; 103. First-shot cavity; 104. Second-shot cavity; 105. Injection cavity; 10. First-shot fixed mold; 11. First-shot mold core; 12. First-shot runner; 121. First-shot injection port; 122. First-shot manifold; 123. First-shot nozzle; 20. Second-shot fixed mold; 21. Second-shot mold core; 13. Second-shot runner; 131. Second-shot injection port; 132. Second-shot manifold; 133. Second-shot nozzle; 30. Moving mold; 31. Lower mold base; 32. Lower mold. 321. First mounting port; 322. Second mounting port; 33. Fixed core; 34. Movable core; 341. Upper main body; 342. Lower limiting part; 343. First actuating cylinder; 35. First injection channel; 351. First flow channel section; 352. Second flow channel section; 36. Second injection channel; 361. Third flow channel section; 362. Fourth flow channel section; 37. Nozzle abutting recess; 38. Ejector insert; 381. First ejector rod; 382. First ejector plate; 383. Molding surface; 384. Snap-fit ​​cavity;

[0058] 200. Silver decorative border for car instrument panel; 2001. Base shell; 2002. Color layer; 2003. Clip-on structure. Detailed Implementation

[0059] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0060] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0061] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0062] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0063] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0064] Please refer to the following: Figures 1 to 17 The two-color injection mold 100 for the silver decorative border 200 of the automotive instrument panel provided in this application embodiment will now be described. The two-color injection mold 100 for the silver decorative border 200 of the automotive instrument panel includes: a primary fixed mold 10, a secondary fixed mold 20, and two moving molds 30.

[0065] A first-shot fixed mold 10 is installed at the first-shot station 101, and a second-shot fixed mold 20 is installed at the second-shot station 102. Two moving molds 30 can cyclically move between the first-shot station 101 and the second-shot station 102, so that the moving mold 30 closes with the corresponding first-shot fixed mold 10 or second-shot fixed mold 20. When the first-shot fixed mold 10 and the moving mold 30 are closed, 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 closed with the second-shot fixed mold 20, the color layer 2002 can be injection molded on the surface of the bottom shell 2001. 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 disposed on the lower mold base 31, a fixed core 33 fixedly disposed on the lower mold base 31, and a movable core 34 that can be moved up and down and is installed on the lower mold base 31 and located between the lower mold core 32 and the core; when the first-shot fixed mold 10 and the moving mold 30 are closed, the movable core 34 moves up a first distance to close with the first-shot mold core 11 and the lower mold core 32. The first injection cavity 103 of the molding base shell 2001 is formed; after the second injection fixed mold 20 and the moving mold 30 are closed, the movable core 34 moves down a second distance and closes with the second injection mold core 21, the fixed core 33 and the lower mold core 32 to form the second injection cavity 104 of the molding color layer 2002; before the second injection, the movable core 34 moves down a third distance and closes with the fixed core 33 and the lower mold core 32 to form the injection cavity 105, and the top of the injection cavity 105 is connected to the bottom of the second injection cavity 104.

[0066] Specifically, by setting the lower mold core 32, fixed core 33, and movable core 34 in the moving mold 30, after the first injection molding of the bottom shell 2001 and before the second injection molding, the movable core 34 can be driven to move down a third distance, so that the bottom of the second injection cavity 104 forms an injection cavity 105. After the hot melt paste of the second injection is injected into the injection cavity 105, the movable core 34 moves up to push the hot melt paste in the injection cavity 105 upward into the second injection cavity 104 for injection molding of the color layer 2002. This solves the problem of mutual penetration, diffusion, or color mixing between the color layer 2002 and the bottom shell 2001 during the second injection molding, and improves the production reliability and efficiency of the silver decorative border.

[0067] In some embodiments, the lower mold core 32 is provided with an injection channel 35 and two injection channels 36. One end of the injection channel 35 passes through the side of the lower mold core 32 and is connected to an injection cavity 103. One end of the two injection channels 36 passes through the side of the lower mold core 32 and is connected to an injection cavity 105. The first-shot fixed mold 10 is provided with an injection channel 12, which is connected to the other end of the injection channel 35. The second-shot fixed mold 20 is provided with two injection channels 13, which are connected to the other ends of the two injection channels 36.

[0068] Specifically, the injection channel 12 includes an injection port 121, an injection manifold 122, and an injection nozzle 123 disposed in the injection mold 10. The injection manifold 122 is provided with an injection manifold channel (not shown in the figure). One end of the injection manifold channel is conductively connected to the injection port 121, and one end of the injection nozzle 123 is conductively connected to the other end of the injection manifold channel. The other end of the injection nozzle 123 is conductively connected to the other end of the injection channel 12. The two-shot injection channel 13 includes a two-shot injection port 131, a two-shot manifold plate 132, and a two-shot nozzle 133 disposed on the two-shot fixed mold 20. The two-shot manifold plate 132 is provided with a two-shot manifold channel (not shown in the figure). One end of the two-shot manifold channel is connected to the two-shot injection port 131, one end of the two-shot nozzle 133 is connected to the other end of the two-shot manifold channel, and the other end of the two-shot nozzle 133 is connected to the other end of the two-shot injection channel 13.

[0069] Since the overall structure of the silver decorative frame 200 of the automotive instrument panel is a slender and thin frame structure, a four-corner injection molding process is preferred when performing one-shot injection molding of the base shell 2001 and two-shot injection molding of the color layer 2002, which can improve injection efficiency. Specifically, there are four injection runners 35, which are connected one-to-one to the four corners of the injection cavity 103. The injection manifold 122 is provided with four injection manifold channels, and an injection nozzle 123 is provided at the end of each injection manifold channel, i.e., four injection nozzles 123. When the fixed mold 10 and the moving mold 30 are closed, one injection nozzle 123 can be connected to one injection runner 35, so that the hot melt slurry is injected from the injection port 121 and flows through the injection manifold channels and injection nozzles 123, and enters from the four corners of the injection cavity 103. There are four two-injection flow channels 36, which are connected one-to-one to the four corners of the two-injection cavity 104. The two-injection flow divider plate 132 is provided with four two-injection flow divider channels, and a two-injection nozzle 133 is provided at the end of each two-injection flow divider channel, that is, four two-injection nozzles 133. When the two-injection fixed mold 20 and the moving mold 30 are closed, one two-injection nozzle 133 can be connected to one two-injection flow channel 36, so that the hot melt slurry is injected from the two-injection injection port 131 and flows through the two-injection flow divider channel and the two-injection nozzle 133, and is injected into the injection cavity 105 from the four corners of the injection cavity 105.

[0070] It is understandable that the hot melt paste colors are different for at least the first and second injection molding processes; for example, the hot melt paste for the first injection is black, and the hot melt paste for the second injection is silver, thus enabling the injection molding of a silver decorative border 200 for automotive dashboards. Alternatively, different plastic pastes can be used for the first and second injection molding processes.

[0071] More specifically, the 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 connected to one end of the first runner section 351. The other end of the second runner section 352 penetrates the side of the injection cavity 103. The lower mold core 32 is provided with a nozzle abutment recess 37 at the location of the first runner section 351. The second 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 connected to one end of the third runner section 361. The other end of the fourth runner section 362 penetrates the side of the injection cavity 105. The lower mold core 32 is provided with a nozzle abutment recess 37 at the location of the third runner section 361.

[0072] Preferably, one end of the second runner section 352 is lower than one end of the second runner section 352, making the entire second runner section 352 inclined. This allows the hot melt slurry injected into the injection cavity 103 to be injected obliquely. This structure can reduce the generation of air bubbles during the injection of the hot melt slurry, thereby improving the fullness of the injection-molded bottom shell 2001 and preventing pores. The other end of the fourth runner section 362 is lower than one end of the fourth runner section 362, making the entire fourth runner section 362 inclined. Moreover, the other end of the fourth runner section 362 is lower than the other end of the second runner section 352, allowing the other end of the fourth runner section 362 to be conductively connected to the injection cavity 105, rather than directly connecting the first injection cavity 103 and the second injection cavity 104.

[0073] In other embodiments, the lower mold core 32 is provided with a first mounting position extending through its upper and lower surfaces. The fixed core 33 is fixedly installed on the lower mold base 31 and located within the first mounting position. The fixed core 33 and the lower mold core 32 enclose the first mounting opening 321 and the second mounting opening 322, with the second mounting opening 322 being larger than the first mounting opening 321. The movable core 34 includes an upper main body 341 and a lower limiting part 342. The upper main body 341 is movable up and down and is disposed in the first mounting opening 321. The lower limiting part 342 is movable up and down and is disposed in the second mounting opening 322. The height of the lower limiting part 342 is less than the height of the second mounting opening 322.

[0074] 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 part 342. With this structure, the telescopic rod of the first actuating cylinder 343 can be extended and retracted, thereby controlling the up and down movement of the movable core 34.

[0075] Preferably, since the movable core 34 is designed according to the shape of the injection-molded silver decorative frame 200 of the automotive instrument panel, the overall shape of the movable core 34 is a ring structure, that is, the bottom of the entire first injection cavity 103 and the second injection cavity 104 are surrounded by the movable core 34. Therefore, there are four first actuating cylinders 343, which are arranged one at each of the four corners of the movable core 34. By simultaneously controlling the extension rods of the four first actuating cylinders 343 to extend and retract vertically, the movable core 34 is driven to move vertically. The driving force is balanced, which helps to improve the reliability of the movable core 34 in extending and retracting vertically.

[0076] Understandably, after the movable core 34 moves upward by a first distance and downward by a second distance, the upper main body 341 can close the second-injection injection channel 36; after the movable core 34 moves downward by a third distance, the top of the upper main body 341 is located below the other end of the fourth flow channel section 362, making the second-injection injection channel 36 connected to the injection cavity 105. During the first-injection injection process, the movable core 34 moves upward by a first distance, forming the first-injection cavity 103 and closing the second-injection injection channel 13 through the movable core 34, the first-injection mold core 11, and the lower mold core 32, thereby ensuring that the hot melt paste will not enter the second-injection injection during the first-injection injection process; only after the movable core 34 moves downward by a third distance can the second-injection injection channel 13 be connected to the injection cavity 105, allowing the second-injection hot melt paste to be injected into the injection cavity 105.

[0077] It should be noted that the injection cavity 105 is actually the location of the first mounting port 321. After the movable core 34 moves down by a third distance, the injection cavity 105 is formed by the fixed core 33, the movable core 34 and the lower mold core 32.

[0078] In some embodiments, the device further includes an ejector insert 38, which is movable up and down and mounted on the lower mold core 32. The bottom of the ejector insert 38 is connected to a first ejector rod 381, and the bottom of the first ejector rod 381 is connected to a first ejector plate 382. The first ejector plate 382 is movable up and down and mounted on the lower mold base 31. The ejector insert 38 has a molding surface 383 facing the injection cavity 103. The molding surface 383 is recessed with a snap-fit ​​cavity 384, which is used to mold the snap-fit ​​structure 2003 of the bottom shell 2001.

[0079] Furthermore, the moving mold 30 can also move up and down and is equipped with a second ejector plate. The second ejector plate is equipped with multiple second ejector pins. The multiple second ejector pins can extend upward into the two-shot cavity 104. After the two-shot molding of the color layer 2002 is completed, the silver decorative frame 200 of the car instrument panel can be ejected through the second ejector pins and the ejector insert 38, thus completing the blanking of the silver decorative frame 200 of the car instrument panel.

[0080] It should be noted that the first-shot fixed mold, the second-shot fixed mold, and the moving mold are also equipped with cooling channels and heating channels to assist in controlling the temperature of the first-shot mold core, the second-shot mold core, and the lower mold core during the injection molding of the base shell and color layer, thereby improving the efficiency of injection molding of the base shell and color layer. In addition, the first-shot fixed mold, the second-shot fixed mold, and the moving mold are equipped with venting channels to vent the first-shot cavity and the second-shot cavity during the injection of hot melt slurry. These are standard design methods used by technicians in the field of two-color injection molds, and will not be elaborated on here.

[0081] The present invention also provides a two-color injection molding method for a silver decorative border 200 for an automotive instrument panel, applied to a two-color injection mold 100 for the aforementioned silver decorative border 200 for an automotive instrument panel, the two-color injection molding method comprising the following steps:

[0082] Step 1: Install the first injection fixed mold 10 and the second injection fixed mold 20 on the injection molding machine, and install the two moving molds 30 on the injection molding machine and drive the two moving molds 30 to cycle between the first injection station 101 or the second injection station 102.

[0083] Step 2: Drive the moving mold 30 of the first injection station 101 to close with the fixed mold 10 of the first injection, and drive the movable core 34 to move up a first distance, so that the movable core 34, the first injection mold core 11 and the lower mold core 32 form the first injection cavity 103.

[0084] Step 3: Inject hot melt slurry into the injection cavity 103 using an injection molding machine. After the hot melt slurry is injected, let it stand for 5-20 seconds to form the bottom shell 2001.

[0085] Step 4: The moving mold 30 opens from the first injection mold 10, and the bottom shell 2001 is separated from the first injection mold 10;

[0086] Step 5: The injection molding machine drives the moving mold 30 of the first injection station 101 to the second injection station 102, and the moving mold 30 of the second injection station 102 moves to the first injection station 101 to perform the above steps 2-4.

[0087] Step 6: The moving mold 30 and the fixed mold 20 located at the second injection station 102 are closed, and the moving core 34 is moved down by a second distance, so that the moving core 34, the fixed core 33, the lower mold core 32 and the second injection mold core 21 are closed to form the second injection cavity 104 of the molding color layer 2002.

[0088] Step 7: Before the second 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 form the injection cavity 105.

[0089] Step 8: Inject hot melt paste into injection cavity 105 using injection molding machine. After the hot melt paste is injected, drive the movable core 34 to move upward, push the hot melt paste in injection cavity 105 upward into two injection cavity 104 and hold for 5-20 seconds, so that color layer 2002 is formed on the surface of bottom shell 2001 to injection mold silver decorative frame 200 of car instrument panel.

[0090] Step 9: The moving mold 30 and the two-shot fixed mold 20 are opened, and the silver decorative frame 200 of the car instrument panel is ejected and unloaded;

[0091] Step 10, repeating steps 2-9, enables continuous injection molding of the silver decorative border 200 for automotive dashboards.

[0092] Specifically, before performing the two-shot injection molding of the color layer 2002, the movable core 34 moves down a third distance to form the injection cavity 105. After injecting the hot melt paste into the injection cavity 105, the movable core 34 moves up to push the hot melt paste in the injection cavity 105 into the two-shot cavity 104, thus completing the injection molding of the color layer 2002 on the surface of the bottom shell 2001. This solves the problem of the hot melt paste reheating the bottom shell 2001, thereby ensuring that the bottom shell 2001 will not deform during the two-color injection molding of the bottom shell 2001 and the color layer 2002, and that there will be no mutual penetration, diffusion, or color mixing between the bottom shell 2001 and the color layer 2002. This improves the production reliability and yield of the silver decorative border. At the same time, pushing the hot melt paste into the two-shot cavity by the movable core can improve the flow reliability of the hot melt paste, making the color layer molding more uniform and preventing defects such as bubbles.

[0093] It should be noted that the second downward movement of the movable core 34 is based on the second downward movement of the movable core 34 after completing the first upward movement. The third downward movement of the movable core 34 is based on the third downward movement of the movable core 34 after completing the second downward movement. After the movable core 34 moves upward and pushes the hot melt paste in the injection cavity 105 to the two-shot cavity 104, the movable core 34 cancels the stroke of the third downward movement, restoring it to the state of the next second distance. 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. At this time, the two-shot cavity 104 contains the bottom shell 2001 of the first injection molding, so that the color layer 2002 of the second injection molding can be integrated with the bottom shell 2001.

[0094] The above are merely 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 should not be construed as limiting the scope of protection of the present invention in any way. Based on this explanation, any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention, as well as other specific embodiments of the present invention that can be conceived by those skilled in the art without creative effort, should be included within the scope of protection of the present invention.

Claims

1. A two-color injection mold for a silver decorative border on an automotive instrument panel, comprising a first-shot station (101) with a first-shot fixed mold (10), a second-shot station (102) with a second-shot fixed mold (20), and two moving molds (30), the two moving molds (30) being cyclically switchable between the first-shot station (101) and 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 moving mold (30) includes a lower mold base (31), a lower mold core (32) fixedly disposed on the lower mold base (31), a fixed core (33) fixedly disposed on the lower mold base (31), and a movable core (34) that can be moved up and down and is installed on the lower mold base (31) and located between the lower mold core (32) and the core; After the fixed mold (10) and the moving mold (30) are closed, the movable core (34) moves up a first distance and closes with the mold core (11) and the lower mold core (32) to form the mold cavity (103) of the molding bottom shell (2001). After the fixed mold (20) and the moving mold (30) are closed, the movable core (34) moves down a second distance and closes with the two-shot mold core (21), the fixed core (33) and the lower mold core (32) to form the two-shot cavity (104) of the molding color layer (2002); before the two-shot injection, the movable core (34) moves down a third distance and closes with the fixed core (33) and the lower mold core (32) to form the injection cavity (105), and the top of the injection cavity (105) is connected to the bottom of the two-shot cavity (104).

2. The two-color injection mold for the silver decorative border of an automotive instrument panel according to claim 1, characterized in that, The lower mold core (32) is provided with an injection channel (35) and two injection channels (36). One end of the injection channel (35) passes through the side of the lower mold core (32) and is connected to an injection cavity (103). One end of the two injection channels (36) passes through the side of the lower mold core (32) and is connected to an injection cavity (105). The first injection mold (10) is provided with a first injection runner (12), which is connected to the other end of the first injection runner (35); the second injection mold (20) is provided with a second injection runner (13), which is connected to the other end of the second injection runner (36).

3. The two-color injection mold for the silver decorative border of an automotive instrument panel according to claim 2, characterized in that, The injection runner (12) includes an injection port (121), an injection manifold (122), and an injection nozzle (123) disposed on the injection mold (10). The injection manifold (122) is provided with an injection manifold channel. One end of the injection manifold channel is connected to the injection port (121), one end of the injection nozzle (123) is connected to the other end of the injection manifold channel, and the other end of the injection nozzle (123) is connected to the other end of the injection runner (12). The two-shot injection channel (13) includes a two-shot injection port (131), a two-shot manifold (132), and a two-shot nozzle (133) located in the two-shot mold (20). The two-shot manifold (132) is provided with a two-shot manifold channel. One end of the two-shot manifold channel is connected to the two-shot injection port (131), one end of the two-shot nozzle (133) is connected to the other end of the two-shot manifold channel, and the other end of the two-shot nozzle (133) is connected to the other end of the two-shot injection channel (13).

4. The two-color injection mold for the silver decorative border of an automotive instrument panel according to claim 3, characterized in that, An 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 connected to one end of the first runner section (351). The other end of the second runner section (352) penetrates the side of an injection cavity (103). The lower mold core (32) has a nozzle abutment recess (37) at the location of the first runner section (351). The two-stage 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 connected to one end of the third runner section (361). The other end of the fourth runner section (362) penetrates the side of the injection cavity (105). The lower mold core (32) has a nozzle abutment recess (37) at the location of the third runner section (361).

5. The two-color injection mold for the silver decorative border of an automotive instrument panel according to any one of claims 1-4, characterized in that, The lower mold core (32) is provided with a first mounting position that extends through its upper and lower surfaces. The fixed core (33) is fixedly installed on the lower mold base (31) and located in the first mounting position. The fixed core (33) and the lower mold core (32) form a first mounting opening (321) and a second mounting opening (322). The second mounting opening (322) is larger than the first mounting opening (321). The movable core (34) includes an upper main body (341) and a lower limiting part (342). The upper main body (341) is movable up and down and is located at the first mounting port (321). The lower limiting part (342) is movable up and down and is located at the second mounting port (322). The height of the lower limiting part (342) is less than the height of the second mounting port (322).

6. The two-color injection mold for the silver decorative border of an automotive instrument panel according to claim 5, characterized in that, It also includes a first actuator cylinder (343), whose telescopic rod can extend upward or retract downward, and the end of the telescopic rod is fixedly connected to the lower limiting part (342).

7. The two-color injection mold for the silver decorative border of an automotive instrument panel according to claim 5, characterized in that, After the movable core (34) moves up a first distance and down a second distance, the upper main body (341) can close the two injection channels (35); after the movable core (34) moves down a third distance, the top of the upper main body (341) is located below the other end of the fourth channel section (362), so that the two injection channels (36) are connected to the injection cavity (105).

8. The two-color injection mold for the silver decorative border of an automotive instrument panel according to claim 1, 2, 3, 4, 6, or 7, characterized in that, It also includes an ejector insert (38), which can be moved up and down and installed on the lower mold core (32). The bottom of the ejector insert (38) is connected to a first ejector rod (381), and the bottom of the first ejector rod (381) is connected to a first ejector plate (382). The first ejector plate (382) can be moved up and down and installed on the lower mold base (31). The ejector insert (38) has a molding surface (383) facing the injection cavity (103), and the molding surface (383) is recessed with a snap-fit ​​cavity (384), which is used to form the snap-fit ​​structure (2003) of the bottom shell (2001).

9. A two-color injection molding method for a silver decorative border on an automotive instrument panel, characterized in that, The two-color injection mold includes the silver decorative border for automotive instrument panels 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 panel according to claim 9, characterized in that, Includes the following steps: Step 1: Install the first injection mold (10) and the second injection 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 between the first injection station (101) or the second injection station (102). Step 2: Drive the moving mold (30) of the first injection station (101) to close with the fixed mold (10), and drive the movable core (34) to move up a first distance, so that the movable core (34), the first injection mold core (11) and the lower mold core (32) form the first injection cavity (103). Step 3: Inject hot melt slurry into a single injection cavity (103) using an injection molding machine. After the hot melt slurry is injected, allow it to stand still for 5-20 seconds to form the bottom shell (2001). Step 4: The moving mold (30) opens from the fixed mold (10) and the bottom shell (2001) is separated from the fixed mold (10). Step 5: The injection molding machine drives the moving mold (30) of the first injection station (101) to move to the second injection station (102), and the moving mold (30) of the second injection station (102) moves to the first injection station (101) to perform the above steps 2-4. Step 6: The moving mold (30) located at the second injection station (102) and the fixed mold (20) of the second injection are closed, and the movable core (34) is moved down by a second distance so that the fixed core (33), the movable core (34), the lower mold core (32) and the second injection mold core (21) are closed to form the second injection cavity (104) of the molding color layer (2002). Step 7: Before the second injection, drive the movable core (34) to move down by a third distance so that the fixed core (33), the lower mold core (32) and the movable core (34) form the injection cavity (105). Step 8: Inject hot melt paste into injection cavity (105) using injection molding machine. After the hot melt paste is injected, drive the movable core (34) to move upward, push the hot melt paste in injection cavity (105) upward into the two-shot cavity (104) and hold for 5-20 seconds, so that the color layer (2002) is formed on the surface of the bottom shell (2001) to injection mold the silver decorative frame (200) of the car instrument panel. Step 9: The moving mold (30) and the two-shot fixed mold (20) are opened, and the silver decorative frame (200) of the car instrument panel is ejected and unloaded; Step 10, repeating steps 2-9, can continuously injection mold the silver decorative border of the car instrument panel (200).

Images