A two-color injection molding process

Abstract

The present invention relates to the technical field of automobile parts processing and production, and in particular to a two-color injection molding process. A two-color injection molding mold is provided with an insert positioning device, including a limit block assembly and a slider assembly, which are installed in a mold cavity. The inclined surface of the core interacts with the inclined surface of the slider assembly to achieve positioning of the insert and the semi-finished product in the mold, and two-color injection molding production is carried out. The present invention has a scientific and reasonable design, a simple and practical structure, a safe and reliable function, and is easy to operate. It realizes continuous cycle production of embedded decorative panel products, saves costs, reduces labor intensity, improves production efficiency, and reduces consumption.

Description

Technical Field

[0001] The invention relates to the technical field of automobile parts processing and production, in particular to a two-color injection molding process for an in-mold embedded decorative plate. Background Art

[0002] Using a two-shot injection molding process, decorative panels with in-mold inserts are molded on two-shot molding equipment. The semi-finished product obtained after the first shot remains in the mold cavity. After the mold is rotated or translated, the second shot is performed to produce the decorative panel with in-mold insert. After the first shot is completed and the mold is rotated or translated, the semi-finished product remaining in the mold cavity must be securely fixed and prevented from moving. To achieve this, existing technologies use a drive device (hydraulic cylinder, electric cylinder, pneumatic cylinder, etc.) to drive a slider to secure the semi-finished product. This method occupies a large mold space, is complex, and is costly. Failure of the drive device can also affect product quality. Summary of the Invention

[0003] The purpose of the present invention is to solve the above problems and provide a two-color injection molding process that can produce the above products in a cyclic and continuous manner.

[0004] The technical solution provided by the present invention is:

[0005] A two-color injection molding process, which uses a two-color injection mold, including a movable mold and a fixed mold, the movable mold includes a movable mold 1 and a movable mold 2, the movable mold 1 includes a core plate 1, a core fixing plate 1, a core mounting plate 1 and a core connecting plate 1, the core plate 1 is provided with a core 1 as a shot core, fixedly mounted on the core mounting plate 1, the core mounting plate 1 is fixedly connected to the core fixing plate 1 through the core connecting plate 1, the core fixing plate 1 is fixedly mounted on a movable plate of the injection molding machine, the movable mold 2 includes a core plate 2. Core fixing plate 2, core mounting plate 2 and core connecting plate 2, the core plate 2 is fixedly mounted on the core mounting plate 2, provided with core 2 as a two-shot core, the core mounting plate 2 is fixedly connected to the core fixing plate 2 through the core connecting plate 2, the core fixing plate 2 is fixedly mounted on another moving plate of the injection molding machine; the fixed mold includes a cavity fixing plate and a cavity plate, two identical cavity fixing plates are fixedly mounted on the rotating plate of the injection molding machine, and the two cavity plates are respectively provided with a cavity 1 and a cavity 2 with the same structure;

[0006] An insert positioning device is provided in the two-color injection mold, and the insert positioning device includes a limit block assembly and a slider assembly. The limit block assembly includes a fixed block, a limit block head, a spring, a gasket, a retaining spring and a fixing screw. The limit block head is provided with a convex strip, and the fixed block is provided with a mounting hole and a step hole. A slot is provided in the step hole. The limit block, spring, gasket and retaining spring are installed in the step hole of the fixed block in sequence. The retaining spring is clamped in the slot of the step hole of the fixed block, supporting the gasket so that the spring is pressed between the gasket and the limit block head, and the limit block head is blocked by the step of the fixed block step hole. The convex strip protrudes from the step hole, and two-level step slots are respectively opened on cavity one and cavity two. The fixing screw is fixed and installed through the mounting hole of the limit block assembly. In the first-level step slot of cavity one and cavity two, the slider assembly includes a slider and a pressure strip, the slider is provided with a front end inclined surface, a pressure tongue, a side boss, a rear end inclined surface and a bottom groove, the bottom groove has two front strips and a rear strip, and two-level step slots are respectively opened on cavity one and cavity two. The front side of the other level step slot of cavity one is set as the front end limiting surface, and the rear side of the other level step slot of cavity two is set as the rear end limiting surface. The pressure strips are respectively fixed in the other level step slot of cavity one and cavity two, and form a slide groove with the steps of the step slot. The slider is slidably installed in the slide groove through the side boss, pressing the limit block assembly, and the convex strip of the limit block head can be correspondingly stuck in the bottom groove of the front strip or the rear strip of the slider.

[0007] The steps of the two-color injection molding process are as follows:

[0008] 1) When the mold is in the open state, the slider is in the withdrawn state, and the mold insert is placed in the mold cavity. The slider is moved to press the mold insert; after the mold insert is placed, the mold is closed, and the inclined surface of the core presses the rear inclined surface of the slider. The limit block head is pressed and retracted, and disengages from the front groove of the bottom groove of the slider, so that the slider slides forward a distance S until the front limit surface is limited by the slider. At this time, the rear groove of the other bottom groove just corresponds to the upper part of the limit block head. The limit block head extends out and clamps the slider to limit the slider. The slider presses the mold insert, the mold closing is completed, and the substrate is injected in one shot;

[0009] 2) After the first shot is completed, a semi-finished product is obtained and the mold is opened. Since the slider presses the mold insert and fuses it with the substrate to form a whole, the semi-finished product is fixed in the mold cavity.

[0010] 3) Cavity 1 moves to the side of cavity 2 by rotation or translation, and the second-shot cavity 2 exchanges positions with the first-shot cavity 1 to proceed to the next cycle. The mold is closed, and the inclined surface of core 2 presses against the front inclined surface of the slider. After the limit block head is pressed, the limit block head retracts and disengages from the rear groove of the bottom groove of the slider, causing the slider to slide backward a distance S. The rear end limit surface of cavity 2 is limited to the slider. At this time, the front groove of the bottom groove is just above the limit block head. The limit block head is ejected, clamping the slider and limiting the slider. The slider and the pressure tongue are separated from the mold insert, and the mold is closed. Substrate 2 is injected. Substrate 2 and substrate 1 are fused together, and the decorative board product is formed by two shots.

[0011] 4) Mold opening: Since the slider and the tongue have been detached from the mold insert, there is no restriction on the second-shot decorative panel product. In addition, the auxiliary design of the second substrate has ribs or snap features, so the decorative panel product remains on the second core after the second shot, and the molded product is finally taken out;

[0012] 5) The two cavity plates and cavity one and cavity two exchange positions by rotation or translation, thereby performing continuous production in a cycle.

[0013] The limit block assembly and the slider assembly are respectively installed at the upper and lower parts of the cavity one and the cavity two.

[0014] The double-color injection molding process of the present invention has a scientific and reasonable design, a simple and practical structure, a safe and reliable function, and is easy to operate. It realizes continuous cycle production of embedded decorative panel products, saves costs, reduces labor intensity, improves production efficiency, and reduces consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings described herein are used to provide further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute improper limitations on the present application.

[0016] Figure 1 This is a schematic diagram of the mold opening status of the two-color injection molding machine.

[0017] Figure 2 The figure is a schematic diagram of the insert positioning device of the double-color injection mold of the present invention and its function.

[0018] Figure 3 It is a three-dimensional schematic diagram of the slider assembly.

[0019] Figure 4 for Figure 3 (Left) Schematic side view.

[0020] Figure 5 A cross-sectional diagram showing the installation of the slider assembly.

[0021] Figure 6 It is a schematic diagram of the mold closing state of the present invention.

[0022] Figure 7 This is a schematic diagram of the mold opening state of the present invention.

[0023] In the figure: 000-rotating plate, 001-cavity fixing plate, 002-core plate 1, 003-cavity plate, 004-core plate 2, 005-core mounting plate 2, 006-core fixing plate 1, 007-core fixing plate 2, 008-core mounting plate 1, 009-core connecting plate 2, 010-core connecting plate 1, 011-core 1, 011.1-core 1 inclined surface, 012-cavity 2, 012.1-rear end limit surface, 013-cavity 1, 013.1-front end limit surface, 014-core 2, 014.1-core 2 inclined surface, 1 01-mold insert, 102-base material, 103-skeleton, 201-slider, 201.1-front end bevel, 201.2-rear end bevel, 201.3-bottom groove, 201.4-pressing tongue, side boss 201.5, 202-pressing strip, 203-limit block assembly, 203.1-fixing block, 203.2-limit block head, 203.3-spring, 203.4-gasket, 203.5-circlip, 203.6-fixing screw, S-bottom groove 201.3, the distance between the front and rear grooves is S (movement distance of slider 201). DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described below are only used to explain the present invention. In these descriptions, it is necessary to pay attention to the keywords, including "mold insert", "substrate", "skeleton", "step slot", "convex strip", "pressing tongue", "groove", "limiting surface", "limiting block head", etc. These are only for the convenience of describing the present invention and simplifying the description, and therefore should not be understood as limiting the present invention.

[0025] like Figure 1As shown, a two-color injection mold includes a movable mold and a fixed mold. The movable mold includes a movable mold 1 and a movable mold 2. The movable mold 1 includes a core plate 002, a core fixing plate 006, a core mounting plate 008 and a core connecting plate 010. In this embodiment, the core plate 002 is provided with a core 011 as a shot core, which is fixedly mounted on the core mounting plate 008. The core mounting plate 008 is fixedly connected to the core fixing plate 006 through the core connecting plate 010. The core fixing plate 011 is fixedly mounted on the core mounting plate 008. Plate 1 006 is fixedly mounted on a movable plate of the injection molding machine. The movable mold 2 includes core plate 2 004, core fixing plate 2 007, core mounting plate 2 005 and core connecting plate 2 009. The core plate 2 004 is fixedly mounted on core mounting plate 2 005 and is provided with core 2 014 as a two-shot core. The core mounting plate 2 005 is fixedly connected to core fixing plate 2 007 via core connecting plate 2 009. The core fixing plate 2 007 is fixedly mounted on another movable plate of the injection molding machine. The fixed mold includes cavity fixing plate 001 and cavity plate 003. Two identical cavity fixing plates 001 are fixedly mounted on the rotating plate 000 of the injection molding machine. In this embodiment, they are respectively fixedly mounted with cavity plates 003 of the same structure. The two cavity plates 003 are respectively provided with cavity 1 013 and cavity 2 012 of the same structure.

[0026] The double-color injection mold is equipped with an insert positioning device. Figure 6 and Figure 7 As shown, the insert positioning device includes a stop block assembly 203 and a slider assembly. The stop block assembly 203 includes a fixed block 203.1, a stop block head 203.2, a spring 203.3, a gasket 203.4, a retaining spring 203.5, and a fixing screw 203.6. The stop block head 203.2 is provided with a ridge. The fixed block 203.1 is provided with a mounting hole and a stepped hole. The stepped hole is provided with a slot. The stop block head 203.2, spring 203.3, gasket 203.4, and retaining spring 203.6 are sequentially mounted in the stepped hole of the fixed block 203.1. 5. The retaining spring 203.5 is stuck in the slot of the step hole of the fixed block 203.1, supporting the gasket 203.4, so that the spring 203.3 is pressed between the gasket 203.4 and the limit block head 203.2, and the limit block head 203.2 is blocked by the step hole of the fixed block 203.1. The convex strip protrudes from the step hole, and two-level step slots are respectively opened on the cavity 1 013 and the cavity 2 012. The fixing screw 203.6 is fixed to the first step slot of the cavity 1 013 and the cavity 2 012 through the mounting hole of the limit block assembly 203. Figure 3 and Figure 4As shown, the slider assembly includes a slider 201 and a pressure strip 202. The slider 201 is provided with a front end inclined surface 201.1, a pressure tongue 201.4, a side boss 201.5, a rear end inclined surface 201.2 and a bottom groove 201.3. The bottom groove 201.3 has two grooves, a front groove and a rear groove. The distance between the front groove and the rear groove is S. Two-step slot holes are respectively opened on the cavity 1 013 and the cavity 2 012. The front side of the other step slot hole of the cavity 1 013 is set as the front end limit surface 013.1, and the rear side of the other step slot hole of the cavity 2 012 is set as the rear end limit surface 012.1. Figure 5 As shown, the pressure strip 202 is fixed in the other step slot of cavity one 013 and cavity two 012 respectively, and forms a slide groove with the steps of the step slot. The slider 201 is slidably installed in the slide groove through the side boss 201.5, pressing the limit block assembly 203. The convex strip of the limit block head 203.2 can be correspondingly stuck in the bottom groove 201.3 of the front strip or the rear strip of the slider 201.

[0027] See also Figure 2 As shown, a two-color injection mold insert positioning device, this embodiment is used to be installed on a two-color injection mold of a two-color injection molding device to produce a decorative panel product, which includes a surface in-mold insert 101, an intermediate layer is a substrate 102, which is injection-molded with the in-mold insert 101, and a bottom layer is a skeleton 103 which is injection-molded with the substrate 102.

[0028] During production, the prefabricated in-mold insert 101 is firstly subjected to the double-color injection molding process of the present invention to realize the cyclic and continuous production of the in-mold decorative panel product, and the steps are as follows:

[0029] (1) When the mold is in the open state, the slider 201 is in the withdrawn state, and the mold insert 101 is placed in the cavity 1 013. At this time, the slider 201 can be manually moved to press the mold insert 101 (the limiting force of the limit block assembly 203 can be adjusted by the spring 203.3, and it is appropriate to be easily moved manually). Alternatively, other pre-positioning structures of the mold insert 101 can be designed on the mold insert 101, the cavity 1 013, and the cavity 2 012, without manually moving the slider 201; after the mold insert 101 is placed, the mold is closed, and the core 1 inclined surface 011.1 presses the rear end inclined surface 201.2 on the slider 201, and the limiting block assembly 203 is adjusted by the spring 203.3. The stopper head 203.2 is compressed and retracts, disengaging from the front groove of the bottom groove 201.3 of the slider 201, causing the slider 201 to slide forward by a distance S (the distance between the front and rear grooves of the bottom groove 201.3 is S) until the front limit surface 013.1 limits the slider 201. At this time, the rear groove of the other bottom groove 201.3 just corresponds to the upper part of the stopper head 203.2. The stopper head 203.2 extends and clamps the slider 201, limiting the slider 201 with a certain force. The pressing tongue 201.4 of the slider 201 presses the mold insert 101, completing the mold closing and injecting the substrate 102 in one shot.

[0030] (2) After the first shot injection molding is completed, a first shot semi-finished product is obtained, and the mold is opened. Since the slider 201 presses the mold insert 101 and the substrate 102 fused with it, the first shot semi-finished product is fixed in the mold cavity 1013;

[0031] (3) Cavity 1 013 moves to the side of cavity 2 012 by rotation or translation (the second-shot cavity 2 012 exchanges positions with the first-shot cavity 1 013 to proceed to the next cycle), the mold is closed, the second inclined surface 014.1 of the core presses against the front inclined surface 201.1 of the slider 201, and after the limit block head 203.2 is pressed, the limit block head 203.2 retracts and disengages from the rear groove of the bottom groove 201.3 of the slider 201, causing the slider 201 to slide backward a distance S The rear end limiting surface 012.1 of the second cavity 012 limits the slider 201. At this time, the front groove of the bottom groove 201.3 is just on the upper part of the limiting block head 203.2. The limiting block head 203.2 is ejected, clamping the slider 201 and limiting the slider 201 with a certain force. The slider 201 and the pressing tongue 201.4 are separated from the in-mold insert 101, and the mold is closed. The second substrate is injected and the second substrate is fused with the first substrate to form a decorative board product by two shots.

[0032] (4) Mold opening. Since the slider 201 and the tongue 201.4 have been detached from the mold insert 101, there is no restriction on the second shot decorative panel product. In addition, the substrate 2 103 is designed with auxiliary ribs or snap features, so that the decorative panel product remains on the core 2 014 after the second shot, and the molded product is finally taken out.

[0033] (5) The two cavity plates 003 and cavity one 013 and cavity two 012 exchange positions by rotation or translation, thereby performing continuous production in a cycle.

[0034] The above description is merely one embodiment of the present invention. Those skilled in the art will readily appreciate that the present invention may employ various modifications and variations, which are not exhaustively described here. However, any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to fall within the scope of protection claimed by the present invention.

Claims

1. A two-color injection molding process, characterized in that: The invention adopts a two-color injection mold, comprising a movable mold and a fixed mold, wherein the movable mold comprises a movable mold 1 and a movable mold 2, wherein the movable mold 1 comprises a core plate 1 (002), a core fixing plate 1 (006), a core mounting plate 1 (008) and a core connecting plate 1 (010), wherein the core plate 1 (002) is provided with a core 1 (011) as a single-shot core and is fixedly mounted on the core mounting plate 1 (008), wherein the core mounting plate 1 (008) is fixedly connected to the core fixing plate 1 (006) through the core connecting plate 1 (010), wherein the core fixing plate 1 (006) is fixedly mounted on a movable plate of the injection molding machine, wherein the movable mold 2 comprises a core plate 2 (004), a core fixing plate 2 (007), a core mounting plate 1 (008) and a core connecting plate 1 (010). Mounting plate 2 (005) and core connecting plate 2 (009), core plate 2 (004) is fixedly mounted on core mounting plate 2 (005), provided with core 2 (014) as a two-shot core, core mounting plate 2 (005) is fixedly connected to core fixing plate 2 (007) via core connecting plate 2 (009), core fixing plate 2 (007) is fixedly mounted on another moving plate of the injection molding machine; the fixed mold comprises a cavity fixing plate (001) and a cavity plate (003), two identical cavity fixing plates (001) are fixedly mounted on the rotating plate (000) of the injection molding machine, and the two cavity plates (003) are respectively provided with cavity 1 (013) and cavity 2 (012) of the same structure; An insert positioning device is provided in the double-color injection mold, and the insert positioning device includes a limit block assembly (203) and a slider assembly. The limit block assembly (203) includes a fixed block (203.1), a limit block head (203.2), a spring (203.3), a gasket (203.4), a retaining spring (203.5) and a fixing screw (203.6). The limit block head (203.2) is provided with a convex strip, and the fixed block (203.1) is provided with a mounting hole and a step hole, and a slot is provided in the step hole. The limit block head (203.2), the spring (203.3), the retaining spring (203.5) and the fixing screw (203.6) are installed in sequence in the step hole of the fixed block (203.1). A spring (203.3), a gasket (203.4) and a retaining spring (203.5), wherein the retaining spring (203.5) is clamped in the slot of the step hole of the fixed block (203.1), supporting the gasket (203.4), so that the spring (203.3) is pressed between the gasket (203.4) and the limit block head (203.2), and the limit block head (203.2) is blocked by the step hole of the fixed block (203.1), the convex strip protrudes from the step hole, and two-level step slot holes are respectively opened on the cavity 1 (013) and the cavity 2 (012), and the fixing screw (203.6) is passed through the limit block assembly The mounting hole (203) is fixedly mounted in the first-stage step slot of cavity one (013) and cavity two (012). The slider assembly includes a slider (201) and a pressure strip (202). The slider (201) is provided with a front inclined surface (201.1), a pressure tongue (201.4), a side boss (201.5), a rear inclined surface (201.2) and a bottom groove (201.3). The bottom groove (201.3) has two front strips and a rear strip. Two-stage step slots are respectively opened on cavity one (013) and cavity two (012). The other stage of cavity one (013) is provided with a pressure tongue (201.4). The front side of the step slot is set as a front end limit surface (013.1), and the rear side of the other step slot of the cavity 2 (012) is set as a rear end limit surface (012.1). The pressure strip (202) is respectively fixed in the other step slot of the cavity 1 (013) and the cavity 2 (012), and forms a slide groove with the steps of the step slot. The slider (201) is slidably installed in the slide groove through the side boss (201.5) to cover the limit block assembly (203). The convex strip of the limit block head (203.2) can be correspondingly stuck in the groove (201.3) at the bottom of the front strip or the rear strip of the slider 201. The steps of the two-color injection molding process are as follows: 1) When the mold is in the open state, the slider (201) is in the withdrawn state, the mold insert (101) is placed in the mold cavity (013), and the slider (201) is moved to press the mold insert (101); after the mold insert (101) is placed, the mold is closed, and the core inclined surface (011.1) presses the rear end inclined surface (201.2) on the slider (201), and the limit block head (203.2) is retracted under pressure and disengages from the front groove of the bottom groove (201.3) of the slider (201). , the slider (201) slides forward a distance S until the front limit surface (013.1) limits the slider (201). At this time, the rear groove of the other bottom groove (201.3) just corresponds to the upper part of the limit block head (203.2). The limit block head (203.2) extends out and clamps the slider (201), limiting the slider (201). The slider (201) presses the mold insert (101) with the tongue (201.4). The mold is closed and the base material (102) is injected in one shot. 2) After the first shot injection molding is completed, a first shot semi-finished product is obtained, and the mold is opened. Since the slider (201) presses the mold insert (101) and fuses it with the base material (102) to form an integral whole, the first shot semi-finished product is fixed in the mold cavity (013); 3) Cavity 1 (013) is moved to the side of cavity 2 (012) by rotation or translation, and the second-shot cavity 2 (012) exchanges positions with the first-shot cavity 1 (013) to proceed to the next cycle. The mold is closed, and the second inclined surface (014.1) of the core presses against the front inclined surface (201.1) of the slider (201). After the limit block head (203.2) is pressed, the limit block head (203.2) retracts and disengages from the rear groove of the bottom groove (201.3) of the slider (201), causing the slider (201) to slide backward. From S, the rear end limiting surface (012.1) of the second cavity (012) limits the slider (201), and at this time, the front groove of the bottom groove (201.3) is just above the limiting block head (203.2), and the limiting block head (203.2) is ejected, clamping the slider (201) and limiting the slider (201), and the slider (201) and the pressing tongue (201.4) are separated from the mold insert (101), the mold is closed, and the second substrate is injected, and the second substrate is fused with the first substrate, and the decorative board product is formed by two shots; 4) The mold is opened. Since the slider (201) and the pressure tongue (201.4) have been separated from the mold insert (101), there is no restriction on the second shot decorative panel product. In addition, the auxiliary design on the base material 2 has ribs or snap features, so that the decorative panel product remains on the core 2 (014) after the second shot, and the molded product is finally taken out; 5) The two cavity plates (003) and cavity one (013) and cavity two (012) exchange positions by rotation or translation, thereby performing continuous production in a cycle.

2. A two-color injection molding process according to claim 1, characterized in that: The limit block assembly (203) and the slider assembly are respectively installed at the upper and lower parts of the first cavity (013) and the second cavity (012).

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