A rotary inverted mold structure and injection molding process for two-color injection molding

Abstract

The application relates to the technical field of automobile part processing, and particularly discloses a rotary inverted mold structure for double-color injection molding and an injection molding process. The rotary inverted mold structure for double-color injection molding is characterized in that two concave mold cavities are combined with two convex mold cores to form a first injection cavity space and a second injection cavity space before and after being rotated by 180 degrees; the first convex mold core is provided with two inward push blocks; the second convex mold core is provided with two outward push blocks; each concave mold cavity is provided with two special-shaped sliding blocks, the special-shaped sliding blocks are provided with special-shaped beaks, and the special-shaped sliding blocks are provided with pre-tightening force structures; the end of the inward push block is inserted into the special-shaped sliding block; the end of the outward push block is inserted into the special-shaped sliding block, and the two special-shaped beaks are located outside the second injection cavity space. The rotary inverted mold structure and the injection molding process solve the problems of low production efficiency of double-color injection molding products in the injection molding process and secondary mold combination prone to bruising caused by the end warping deformation of the first color plastic part in the mold opening process.

Description

Technical Field

[0001] This invention relates to the field of automotive parts processing technology, specifically to a rotary inverted mold structure and injection molding process for two-color injection molding production. Background Technology

[0002] Currently, two-color injection molded products are increasingly used in automotive plastic products. These products are made by injection molding two or more types of plastics in two separate processes to meet user design requirements, especially in automotive lighting systems, such as... Figure 1 This is a schematic diagram of a dual-color mask for a car headlight. Figure 1 The two-color mask part is made of transparent plastic part A and black plastic part B by two-color injection molding. The structure such as the mounting buckle is arranged in the black area B. This type of two-color injection molded part generally needs to be obtained by two-stage injection molding.

[0003] In related technologies, for this type of two-color injection molded product, the traditional two-color mold injection structure adopts an inverted mold structure design, which is divided into two injections. The first injection molds the transparent plastic part, as follows: Figure 2 The diagram shows the first injection molding of a two-color face mask. During the first injection molding, the concave mold cavity 10 and the first convex mold core 8-1 are closed to form the first injection cavity space. At this time, the molten plastic enters the second flow channel 2-2 of the hot runner system from the second positioning ring 1-2 along the direction shown by the arrow. After passing through the second hot nozzle 3-2 of the hot runner system, when the valve needle of the hot runner system controlled by the second oil cylinder 5-2 retracts to the right, the front gate of the second hot nozzle 3-2 opens. At this time, the molten plastic enters the first injection cavity space formed by the concave mold cavity 10 and the first convex mold core 8-1. After cooling, the transparent plastic part A of the first injection is obtained.

[0004] like Figure 3 As shown, after the first injection molding is completed, the mold opens under the drive of the injection molding machine. After the first injection molding of the transparent plastic part A is completed, the entire concave mold cavity 10 moves to the left along arrow M to open the mold under the drive of the injection molding machine's mold opening and closing mechanism; at the same time, the driving cylinder 11 of the injection molding machine's hydraulic system supplies pressurized oil from the first oil port 11-1 and the second oil port 11-2, driving the concave mold cavity 10 to slide down along arrow N on the guide slide plate 13 to the position of the second convex mold core 8-2 for the second injection.

[0005] like Figure 4 As shown, after the concave mold cavity 10 moves into position, the injection molding machine's mold closing mechanism drives the entire concave mold cavity 10 along... Figure 3In the opposite direction of the middle arrow M, the mold moves to the right and closes. At this time, the transparent plastic part A injected in the first injection acts as part of the cavity structure, and together with the second convex mold core 8-2, it forms the second injection cavity space. At this time, the injection molding machine enters the first flow channel 2-1 of the hot runner system through the positioning ring 1-1, and passes through the first hot nozzle 3-1 of the hot runner system. When the valve needle of the hot runner system controlled by the first oil cylinder 5-1 retracts to the right, the front gate of the first hot nozzle 3-1 opens. At this time, the black molten plastic enters the second injection cavity space formed by the concave mold cavity 10 and the second convex mold core 8-2, and is filled and molded in the second injection cavity space to obtain the black plastic part B injected in the second injection.

[0006] After the second injection molding of the black plastic part B is completed, the mold opens again under the action of the injection molding machine's mold opening and closing mechanism. At this time, the two-color product is fixed on the second convex mold core 8-2. Under the action of the mold's ejection mechanism, the two-color product is ejected, and the robot arm picks up the part, completing one production cycle. The injection molding machine supplies oil to the drive cylinder 11 again. The oil circuit enters from the second oil port 11-2 and exits from the first oil port 11-1, pulling the concave mold cavity 10 upward to the position of the first injection molding of the transparent plastic part A, and then the mold closes, entering the next production cycle stage.

[0007] Furthermore, the flow divider 4 is used for flow division, the convex mold core template 6 and the support plate 7 are used to support and fix the two convex mold cores, the convex mold core cooling water channel 9-1 and the concave mold cavity cooling water channel 9-2 are used for cooling after injection molding, the guide slide plate 13 and the pressure plate strip 15 are used for sliding and guiding the concave mold cavity 10 up and down, and the guide post guide structure 16 is used for mold closing guidance.

[0008] However, based on the production process of traditional two-color injection molded products (including the first and second colored plastic parts), it is known that the traditional two-color injection mold structure has obvious defects:

[0009] ①Low production efficiency: As can be seen from the above injection molding production process diagram, the mold closes and opens twice, and the cavity 10 needs to move back and forth in the mold frame 12. Only one set of products is obtained in one production cycle, resulting in a long production cycle, low efficiency, and high energy consumption of the production line.

[0010] ② Product deformation and appearance defects are difficult to control: From Figure 3 As can be seen, when the first colored plastic part is injection molded and the mold is opened, the first colored plastic part deforms due to cooling, and its two ends curl up and detach from the concave mold cavity 10. When the mold is closed for the second injection, the second convex mold core 8-2 will crush the first colored plastic part, causing the product deformation to intensify and the appearance defects to be difficult to control. Even worse, the first colored plastic part may detach from the concave mold cavity 10 due to the vibration during the up and down movement of the concave mold cavity 10, causing the first colored plastic part to fall off and be scrapped. Summary of the Invention

[0011] This application provides a rotary inverted mold structure and injection molding process for two-color injection molding production, which solves the problems of low production efficiency and easy damage to the secondary mold closing caused by warping and deformation of the end of the first color plastic part during the mold opening process in two-color injection molding products.

[0012] In a first aspect, embodiments of this application provide a rotary inverted mold structure for two-color injection molding production, which includes a cavity mold assembly and a punch assembly. The punch assembly includes a first punch core located at the upper part and a second punch core located at the lower part. The cavity mold assembly is rotatable along a horizontal rotation axis and includes two cavity mold cavities. Before rotation and after rotation by 180 degrees, the two cavity mold cavities can simultaneously mold with the first punch core to form a first injection cavity space and with the second punch core to form a second injection cavity space.

[0013] The first convex mold core has two inward push blocks on its upper and lower sides facing the concave mold cavity; the second convex mold core has two outward push blocks on its upper and lower sides facing the concave mold cavity.

[0014] Each of the concave mold cavities is provided with two vertically sliding irregularly shaped sliders on the upper and lower sides of its injection molding surface. The irregularly shaped sliders are provided with irregularly shaped tips facing the injection molding surface of the concave mold cavity, and the irregularly shaped sliders are provided with a pre-tightening structure on the side facing away from the irregularly shaped tips.

[0015] The two inward push blocks in the first injection cavity space are inserted into the two upper irregularly shaped sliders, and the two corresponding irregularly shaped tips participate in sealing the ends of the first injection cavity space; and the irregularly shaped tips in the mold-open state participate in pressing the ends of the first colored plastic part in the first injection cavity space under the action of the pre-tightening force structure; the two outward push blocks in the second injection cavity space are inserted into the two lower irregularly shaped sliders, and the two corresponding irregularly shaped tips are located outside the second injection cavity space.

[0016] In conjunction with the first aspect, in one embodiment, both the inward push block and the outward push block have a unidirectional driving slope; both the irregularly shaped sliders have a V-groove; when the inward push block is inserted into the upper irregularly shaped slider, the unidirectional driving slope of the inward push block is used to guide the corresponding irregularly shaped tip to move towards the injection molding surface close to the concave mold cavity.

[0017] When the outward push block is inserted into the lower irregularly shaped slider, the unidirectional driving inclined surface of the outward push block is used to guide the corresponding irregularly shaped tip to move in a direction away from the injection molding surface of the concave mold cavity.

[0018] In conjunction with the first aspect, in one embodiment, the pre-tightening force structure adopts a compression spring; in the mold parting state, the two upper irregularly shaped sliders remain stationary in the first injection molding position under the pre-tightening force of the compression spring; in the mold closing state of the concave mold cavity and the second convex mold core, the unidirectional driving inclined surface of the outward push block is used to insert into the V-groove of the lower irregularly shaped slider to cause the compression spring to compress, and the irregularly shaped tips of the two lower irregularly shaped sliders are located outside the second injection cavity space.

[0019] In conjunction with the first aspect, in one embodiment, the die assembly includes a die frame, two die cavities are installed within the die frame, and the die frame is rotatable along a rotation center line; each die cavity has right-angle notches on its upper and lower sides of its injection molding surface; the die frame is fixedly provided with four limiting blocks, and the four limiting blocks and the four right-angle notches of the two die cavities all form receiving grooves with openings facing the convex die core, the receiving groove structure being used to accommodate the up-and-down sliding of the irregularly shaped slider. One end of the compression spring is fixed to the side of the irregularly shaped slider away from the irregularly shaped tip, and the other end is fixed to the limiting block.

[0020] In conjunction with the first aspect, in one embodiment, each of the irregularly shaped sliders is provided with a guide plate on the side facing away from the V-groove, and a pressure plate is provided parallel to the guide plate, the pressure plate pressing the irregularly shaped slider tightly against the guide plate.

[0021] Secondly, embodiments of this application provide an injection molding process for two-color injection molding production, employing the aforementioned rotary inverted mold structure, wherein the first convex mold core is located at the upper part and the second convex mold core is located at the lower part, and the injection molding process includes the following steps:

[0022] During the first mold closing, the ends of the two inward push blocks are inserted into the two upper irregularly shaped sliders to ensure that the two upper irregularly shaped sliders reach the first injection molding position. The irregularly shaped tips of the two upper irregularly shaped sliders, together with the concave mold cavity and the first convex mold core, constitute the first injection cavity space located at the top for producing the first color plastic part; the molten plastic enters the first injection cavity space and is injection molded to form the first color plastic part.

[0023] The die assembly opens and rotates 180 degrees, switching the upper and lower positions of the two die cavities. During this process, the two irregularly shaped sliders originally located at the upper part remain stationary in the first injection molding position under the action of the pre-tightening structure. The two irregularly shaped sliders originally located at the lower part move to the first injection molding position under the action of the pre-tightening structure.

[0024] In the second mold closing, in the upper mold closing structure, the irregularly shaped tip of the irregularly shaped slider, together with the concave mold cavity and the first convex mold core, constitutes the first injection cavity space located in the upper part for producing the first colored plastic part, and the first colored plastic part is injection molded; at the same time, in the lower mold closing structure, the ends of the two outward push blocks are inserted into the two irregularly shaped sliders and cause the two irregularly shaped tips to retract to the outside of the second injection cavity space, and the second colored plastic part is injection molded in the second injection cavity space based on the first colored plastic part.

[0025] In conjunction with the second aspect, in one embodiment, both the inward push block and the outward push block have unidirectional driving inclined surfaces; and both of the irregularly shaped sliders have V-shaped grooves.

[0026] During mold closing, in the upper mold closing structure, the inward push block is inserted into the upper irregular slider. The one-way driving inclined surface of the inward push block is used to guide the irregular tip of the irregular slider to move towards the injection molding surface close to the concave mold cavity, until the upper irregular slider moves to the first injection molding position.

[0027] Meanwhile, in the lower mold closing structure, the outward push block is inserted into the lower irregular slider. The unidirectional driving inclined surface of the outward push block guides the irregular tip to move away from the injection molding surface of the concave mold cavity, and the lower irregular slider moves to the second injection molding position.

[0028] In conjunction with the second aspect, in one embodiment, the pre-tightening force structure is a compression spring; in the mold parting state, the irregularly shaped slider maintains or returns to the first injection molding position under the pre-tightening force of the compression spring;

[0029] In the mold-closed state, in the lower mold-closed structure, the one-way driving inclined surface of the outward push block is used to insert into the V-groove of the irregular slider, causing the compression spring to compress. The lower irregular slider moves to the second injection molding position, and the corresponding two irregular tips retract to the outside of the second injection cavity space.

[0030] In conjunction with the second aspect, in one embodiment, the die assembly includes a die frame, two die cavities are installed within the die frame, and the die frame is rotatable along a rotation center line; the die cavities have right-angle notches on their upper and lower sides of their injection molding surface;

[0031] The concave mold frame is fixedly provided with four limiting blocks. The four limiting blocks and the four right-angle notches of the two concave mold cavities all form receiving grooves with openings facing the convex mold core. The receiving groove structure is used to accommodate the irregularly shaped slider that slides up and down. One end of the compression spring is fixed to the side of the irregularly shaped slider that is away from the irregularly shaped tip, and the other end is fixed to the limiting block.

[0032] In conjunction with the second aspect, in one embodiment, each of the irregularly shaped sliders is provided with a guide plate on the side facing away from the V-groove, and a pressure plate is provided parallel to the guide plate, the pressure plate pressing the irregularly shaped slider tightly against the guide plate.

[0033] The beneficial effects of the technical solutions provided in this application include at least the following:

[0034] 1. The rotary inverted mold structure of this application allows both concave mold cavities to simultaneously close with the first convex mold core to form a first injection cavity space and with the second convex mold core to form a second injection cavity space, both before and after rotating 180 degrees. Simultaneously, during the formation of the first injection cavity space, the ends of two inward-facing push blocks are inserted into two upper irregularly shaped sliders, guiding corresponding irregularly shaped nozzles to extend to the front gates of the two hot-spot nozzles. The two irregularly shaped nozzles participate in sealing the ends of the first injection cavity space; that is, after the first color plastic portion is formed, the irregularly shaped nozzles form a reverse-clamping structure. In the open mold state, the irregularly shaped nozzles participate in pressing under the pre-tightening force of the pre-tightening structure, pressing the ends of the first color plastic portion within the first injection cavity space to prevent warping and deformation, significantly improving the production qualification rate of two-color injection molded products.

[0035] When forming the second injection cavity space, the ends of the two outward push blocks in the second injection cavity space are inserted into the two irregularly shaped sliders at the bottom, guiding the two irregularly shaped nozzles to exit from the ends of the second injection cavity space for precise mold closing during the injection of the second color plastic part. The rotary inverted mold structure of this application, except for the first two-color injection molded product which requires two mold closings and two mold openings to obtain a complete two-color part, can produce a complete two-color product in each subsequent production cycle, greatly improving production efficiency.

[0036] 2. The rotary inverted mold structure of this application, through the matching of the unidirectional driving inclined surfaces of the inward and outward push blocks with the V-groove of the irregularly shaped slider, can achieve bidirectional driving, that is, close to or far from the injection molding surface, providing a basis for the irregularly shaped tip to participate in sealing and not participate in sealing.

[0037] 3. In the rotary inverted mold structure of this application, the irregularly shaped slider is provided with a compression spring on the side away from the irregularly shaped tip. Under the pre-tightening force of the compression spring, the irregularly shaped slider is still in the first injection molding position after the mold is opened. The two ends of the first colored plastic part of the irregularly shaped tip are pressed and deformed and pressed, and cannot be separated from the concave mold cavity, and are in a conforming state.

[0038] 4. In the injection molding process of this application, two irregularly shaped nozzles participate in sealing the ends of the first injection cavity space. That is, after the first color plastic part is formed, the irregularly shaped nozzles form a reverse snap structure. The irregularly shaped nozzles in the mold-open state participate in pressing under the pre-tightening force of the pre-tightening structure, pressing the ends of the first color plastic part in the first injection cavity space to prevent the ends of the first color plastic part from warping and deforming, which greatly improves the production qualification rate of two-color injection molded products. When forming the second injection cavity space, the ends of the two outward push blocks of the second injection cavity space are inserted into the two irregularly shaped sliders at the bottom, guiding the two irregularly shaped nozzles at the bottom to exit the ends of the second injection cavity space for precise mold closing during the injection of the second color plastic part. In addition to the need for two mold closings and two mold openings to obtain a complete two-color part when producing the first two-color injection molded product, each subsequent production cycle is equivalent to obtaining a complete two-color product, which greatly improves production efficiency. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying 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.

[0040] Figure 1 This is a schematic diagram of a two-color face mask component;

[0041] Figure 2 A schematic diagram of the injection molding of transparent plastic part A using a traditional two-color mold injection structure;

[0042] Figure 3 A schematic diagram showing the downward sliding of the concave mold cavity after the traditional two-color mold injection structure is opened;

[0043] Figure 4 A schematic diagram of the injection molding of the black plastic part B using a traditional two-color mold injection structure;

[0044] Figure 5 This is a schematic diagram of the rotary inverted mold structure of this application during the first mold closing, showing the injection molding of the first colored plastic portion;

[0045] Figure 6 This is a schematic diagram of the rotary inverted mold structure of this application after the first mold closing and the mold opening and rotation by 180 degrees;

[0046] Figure 7 This is a schematic diagram of the rotary inverted mold structure of this application, in which the first color plastic part and the second color plastic part are simultaneously injection molded after the second or more mold closings;

[0047] Figure 8 for Figure 7A magnified view of M in the image;

[0048] Figure 9 This is a schematic diagram of an irregularly shaped slider;

[0049] In the diagram: 1-1, First positioning ring; 1-2, Second positioning ring; 2-1, First flow channel; 2-2, Second flow channel; 3-1, First hot nozzle; 3-2, Second hot nozzle; 4, Diverter plate; 5-1, First hydraulic cylinder; 5-2, Second hydraulic cylinder; 6, Convex mold core template; 7, Support plate; 8-1, First convex mold core; 8-2, Second convex mold core; 9-1, Cooling water channel for convex mold core; 9-2, Cooling water channel for concave mold cavity; 10, Concave mold cavity; 11, Concave mold drive cylinder; 11-1, First oil port; 11-2, Second oil port; 12, Concave mold frame; 13, Guide slide plate; 15, Pressure plate and pressure strip; 16, Guide post guide structure;

[0050] 20. Screw; 21. Inward push block; 22. Irregularly shaped slider; 221. V-groove; 222. Irregularly shaped tip; 23. Guide plate; 25. Compression spring; 24. Limiting block; 26. Outward push block; 27. Pressure plate. Detailed Implementation

[0051] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0052] This application provides a rotary inverted mold structure and injection molding process for two-color injection molding production, which solves the problems of low production efficiency during the injection molding process of two-color injection molded products and the easy damage caused by the warping and deformation of the end of the first color plastic part during the mold opening process when the mold is closed.

[0053] like Figures 5 to 9 As shown, this application discloses a rotary inverted mold structure for two-color injection molding production, the rotary inverted mold structure comprising a cavity mold assembly and a punch mold assembly.

[0054] The punch assembly includes a first punch core 8-1 and a second punch core 8-2. The first punch core 8-1 is used to match the concave mold cavity 10 for injection molding of the first colored plastic part, and the second punch core 8-2 is used to match the concave mold cavity 10 for injection molding of the second colored plastic part.

[0055] The die assembly is rotatable along a horizontal rotation axis and includes two die cavities 10. Before rotation and after rotating 180 degrees, both die cavities 10 can simultaneously close with the first convex mold core 8-1 to form a first injection cavity space and with the second convex mold core 8-2 to form a second injection cavity space. Specifically, the first injection cavity space is used for injection molding a first-color plastic portion, and the second injection cavity space is used for injection molding a second-color plastic portion based on the first-color plastic portion.

[0056] Specifically, such as Figure 5 As shown, the two concave model cavities 10 are arranged symmetrically up and down along the plane containing the horizontal rotation axis, and the first convex model core 8-1 and the second convex model core 8-2 are also arranged symmetrically up and down along the plane containing the horizontal rotation axis.

[0057] Two inward push blocks 21 facing the concave mold cavity 10 are provided on the upper and lower sides of the injection molding surface of the first convex mold core 8-1, that is, one inward push block 21 is provided on the upper and lower sides of the injection molding surface of the first convex mold core 8-1. Two outward push blocks 26 facing the concave mold cavity 10 are provided on the upper and lower sides of the injection molding surface of the second convex mold core 8-2, that is, one outward push block 26 is provided on the upper and lower sides of the injection molding surface of the second convex mold core 8-2. Specifically, the injection molding surface refers to the curved surface that forms the cavity space for injection molding.

[0058] Each concave mold cavity 10 has two vertically sliding irregularly shaped sliders 22 on its upper and lower sides of the injection molding surface, and each irregularly shaped slider 22 has an irregularly shaped tip 222 facing the injection molding surface of the concave mold cavity 10. Figure 5 As shown, the irregularly shaped tips 222 of the two irregularly shaped sliders 22 on both sides of each concave mold cavity 10 are facing each other. The irregularly shaped slider 22 has a warning force structure on the side facing away from the irregularly shaped tips 222, which provides a pre-tightening thrust to the irregularly shaped slider 22.

[0059] When the first injection cavity space is formed, the ends of the two corresponding inward push blocks 21 of the first injection cavity space are inserted into the two upper irregularly shaped sliders 22, guiding the two corresponding irregularly shaped nozzles 222 to move towards the injection molding surface of the concave mold cavity 10. The two irregularly shaped nozzles 222 extend to the front gates of the two hot nozzles respectively. The two irregularly shaped nozzles 222 participate in sealing the ends of the first injection cavity space. The two irregularly shaped nozzles 222, the concave mold cavity 10 and the first convex mold core 8-1 close the mold to form the first injection cavity space. At the same time, the irregularly shaped nozzles 222 in the mold-open state participate in pressing the material under the pre-tightening force of the pre-tightening structure, pressing the ends of the first colored plastic part in the first injection cavity space to prevent the ends of the first colored plastic part from warping and deforming.

[0060] When any concave mold cavity 10 and the second convex mold core 8-2 are molded together to form the second injection cavity space, the ends of the two outward push blocks 26 of the second injection cavity space are inserted into the two irregularly shaped sliders 22 at the bottom, guiding the two corresponding irregularly shaped nozzles 222 to exit the ends of the second injection cavity space. After the mold is closed, the two irregularly shaped nozzles 222 at the bottom are located outside the second injection cavity space.

[0061] Specifically, the plane containing the horizontal rotation axis of the die assembly is divided into an upper part and a lower part.

[0062] The rotary inverted mold structure of this application allows both concave mold cavities 10 to simultaneously close with the first convex mold core 8-1 to form a first injection cavity space and with the second convex mold core 8-2 to form a second injection cavity space, both before and after rotation by 180 degrees. Simultaneously, during the formation of the first injection cavity space, the ends of the two inward push blocks 21 are inserted into the two upper irregularly shaped sliders 22, guiding two corresponding irregularly shaped nozzles 222 to extend to the front gates of the two hot injection nozzles. The two irregularly shaped nozzles 222 participate in sealing the ends of the first injection cavity space; that is, after the first color plastic portion is formed, the irregularly shaped nozzles 222 form a reverse-clamping structure. In the open mold state, the irregularly shaped nozzles 222 participate in pressing the material under the pre-tightening force of the pre-tightening structure, pressing the ends of the first color plastic portion within the first injection cavity space to prevent warping and deformation, greatly improving the production qualification rate of two-color injection molded products.

[0063] When forming the second injection cavity space, the ends of the two outward push blocks 26 of the second injection cavity space are inserted into the two irregularly shaped sliders 22 at the bottom, guiding the two corresponding irregularly shaped nozzles 222 to exit the ends of the second injection cavity space for precise mold closing during the injection of the second color plastic part.

[0064] The rotary inverted mold structure of this application, except for the production of the first two-color injection molded product which requires two mold closings and two mold openings to obtain a complete two-color part, can produce a complete two-color product in each subsequent production cycle, which greatly improves production efficiency.

[0065] In one embodiment, both the inward push block 21 and the outward push block 26 have unidirectional driving ramps, and both irregularly shaped sliders 22 have V-grooves 221.

[0066] When the inward push block 21 is inserted into the upper irregularly shaped slider 22, the unidirectional driving slope of the inward push block 21 is used to guide the corresponding irregularly shaped tip 222 to move towards the injection molding surface of the concave mold cavity 10. When the concave mold cavity 10 and the first convex mold core 8-1 are closed, after the unidirectional driving slope of the two inward push blocks 21 is inserted into the V-groove 221 of the two upper irregularly shaped sliders 22, the two upper irregularly shaped sliders 22 move towards the injection molding surface of the concave mold cavity 10. The two irregularly shaped tips 222 of the two upper irregularly shaped sliders 22 extend to the front gate of the two hot injection nozzles respectively, and participate in the sealing of the end of the first injection cavity space.

[0067] When the outward push block 26 is inserted into the lower irregularly shaped slider 22, the one-way driving slope of the outward push block 26 is used to guide the irregularly shaped nozzle 222 to move away from the injection molding surface of the concave mold cavity 10. When the concave mold cavity 10 and the second convex mold core 8-2 are molded together, after the one-way driving slopes of the two outward push blocks 26 are inserted into the V-grooves 221 of the two lower irregularly shaped sliders 22, the two corresponding lower irregularly shaped nozzles 222 exit the end of the second injection cavity space.

[0068] Preferably, the inward push block 21 and the outward push block 26 are installed on the side of the convex model core using screws or press-fit inserts.

[0069] The driving slopes of the two inward push blocks 21 face the injection molding surface and are close to each other; the driving slopes of the two outward push blocks 26 are away from the injection molding surface and the driving slopes of the two inward push blocks 21 are opposite to each other.

[0070] The rotary inverted mold structure of this application, through the matching of the unidirectional driving inclined surfaces of the inward push block 21 and the outward push block 26 with the V-groove 221 of the irregular slider 22, can achieve bidirectional driving, that is, close to or far from the injection molding surface, providing a basis for the irregular tip 222 to participate in sealing and not participate in sealing.

[0071] In one embodiment, the preload structure uses a compression spring 25, which is always in a compressed state. That is, when the irregularly shaped slider 22 is not inserted with the inward push block 21 or the outward push block 26, the compression spring 25 can provide preload to the irregularly shaped slider 22.

[0072] In the mold parting state, the two irregularly shaped sliders 22 at the top remain stationary in the first injection molding position under the preload of the compression spring 25.

[0073] In the mold-closing state of the concave mold cavity 10 and the second convex mold core 8-2, the one-way driving slope of the outward push block 26 is used to insert into the V-groove 221 of the lower irregular slider 22, causing the compression spring 25 to be further compressed, and the two irregular pointed nozzles 222 are located outside the second injection cavity space.

[0074] When the concave mold cavity 10 and the second convex mold core 8-2 change from the mold-closed state to the mold-open state, the lower irregularly shaped slider 22 returns to the first injection molding position under the action of the compression spring 25.

[0075] In the rotary inverted mold structure of this application, the irregular slider 22 is provided with a compression spring 25 on the side away from the irregular tip 222. Under the pre-tightening force of the compression spring 25, the irregular slider 22 is still in the first injection molding position after the mold is opened. The irregular tip 222 presses the two ends of the first colored plastic part. The two ends of the first colored plastic part are warped and deformed and pressed, and cannot be separated from the concave mold cavity 10, and are in a conforming state.

[0076] In one embodiment, the die assembly includes a die frame 12, two die cavities 10 are mounted within the die frame 12, and the die frame 12 is rotatable along a rotation centerline.

[0077] The concave mold cavity 10 has right-angle notches on its upper and lower sides of the injection molding surface. Four limiting blocks 24 are fixedly installed on the concave mold frame 12. The four limiting blocks 24 and the four right-angle notches of the two concave mold cavities 10 all form receiving grooves with openings facing the convex mold core. The receiving groove structure is used to accommodate the up-and-down sliding of the irregularly shaped slider 22. One end of the compression spring 25 is fixed to the side of the irregularly shaped slider 22 facing away from the irregularly shaped tip 222, and the other end is fixed to the limiting block 24.

[0078] In one embodiment, each irregularly shaped slider 22 has a guide plate 23 on the side facing away from the V-shaped groove 221, and a pressure plate 27 is arranged parallel to the guide plate 23. The pressure plate 27 presses the irregularly shaped slider 22 tightly against the guide plate 23. Specifically, both the guide plate 23 and the pressure plate 27 are disposed in the receiving groove. The guide plate 23 is used to guide the irregularly shaped slider 22, and the pressure plate 27 is used to press the irregularly shaped slider 22 tightly against the guide plate 23 to prevent the irregularly shaped slider 22 from tipping over when sliding up and down.

[0079] like Figure 8 As shown, the structures of the inward push block 21 and the outward push block 26 are exactly the same.

[0080] There is a relationship between the angle β of the unidirectional driving inclined surface of the inward push block 21 and the outward push block 26 and the inclined surface angle α of the V-groove 221: α≥β+1°, which facilitates matching.

[0081] There is a relationship between h1 of the unidirectional driving inclined surface of the inward push block 21 and the outward push block 26 and the groove depth of the V-groove 221: the groove depth of the V-groove ≥ h1 + 3mm.

[0082] There is a relationship between the reciprocating stroke L2 of the irregular slider 22, the distance L1 between the back of the irregular slider 22 and the limiting block 24, and the length of the spring after compression: L2≥L1+length of the spring after compression.

[0083] The reciprocating stroke L2 of the irregular slider 22 and the pressing length L3 of the irregular tip 222 of the irregular slider 22 on the first colored plastic part are related as follows: L2≥L3+3mm.

[0084] The four irregularly shaped sliders 22 can have the same structure, or the two irregularly shaped sliders 22 in the middle can have the same structure, the two irregularly shaped sliders 22 on the outside can have the same structure, while the two irregularly shaped sliders 22 in the middle can have different structures from the two irregularly shaped sliders 22 on the outside.

[0085] The first injection cavity space refers to the cavity space used for injection molding the first color plastic part, and the second injection cavity space refers to the cavity space used for injection molding the second color plastic part.

[0086] This application also discloses an injection molding process for two-color injection molding production, which adopts the above-mentioned rotary inverted mold structure. The rotary inverted mold structure includes a punch assembly. The first punch core 8-1 and the second punch core 8-2 of the punch assembly are symmetrically arranged vertically, with the first punch core 8-1 located at the upper part and the second punch core 8-2 located at the lower part.

[0087] Specifically, the first injection molding position is the final position of the upper irregularly shaped slider 22 when the concave mold cavity 10 and the first convex mold core 8-1 are in the mold-closing state. The second injection molding position is the final position of the lower irregularly shaped slider 22 when the concave mold cavity 10 and the second convex mold core 8-2 are in the mold-closing state.

[0088] The injection molding process includes the following steps:

[0089] During the first mold closing operation, the closing driving force of the two inward push blocks 21 engages with the two upper irregularly shaped sliders 22 at their lower ends, driving them towards the injection molding surface of the concave mold cavity 10. This ensures that the two irregularly shaped sliders 22 reach the first injection molding position. The irregularly shaped tips 222 of the two upper irregularly shaped sliders 22, together with the concave mold cavity 10 and the first convex mold core 8-1, constitute the first injection cavity space located at the top for producing the first color plastic portion. Molten plastic enters the first injection cavity space, completing the injection molding of the first color plastic portion. At this time, the second injection cavity space does not perform injection operations.

[0090] The die assembly opens horizontally and rotates 180 degrees, switching the upper and lower positions of the two die cavities 10. During this process, the two irregularly shaped sliders 22, which were originally located at the upper part, remain stationary in the first injection molding position under the action of the pre-tightening force structure, pressing the two ends of the first colored plastic part. The two irregularly shaped sliders 22, which were originally located at the lower part, move to the first injection molding position under the action of the pre-tightening elastic force of the pre-tightening force structure.

[0091] In the second mold closing, in the upper mold closing structure, two irregularly shaped sliders 22 are inserted into the ends of the two inward push blocks 21. The irregularly shaped tips 222 of the two irregularly shaped sliders 22, together with the concave mold cavity 10 and the first convex mold core 8-1, form the first injection cavity space for the first colored plastic part. Molten plastic enters the first injection cavity space and is injected into the first colored plastic part. At the same time, in the lower mold closing structure, two irregularly shaped sliders 22 are inserted into the ends of the two outward push blocks 26, causing the two irregularly shaped tips 222 to retract to the outside of the second injection cavity space. The second colored plastic part is injected into the second injection cavity space based on the first colored plastic part.

[0092] The mold opening and closing process is the same after the second mold closing. Each time, the first color plastic part can be produced at the top and the second color plastic part can be produced at the bottom at the same time.

[0093] In the injection molding process of this application, two irregularly shaped nozzles 222 participate in the sealing of the end of the first injection cavity space. That is, after the first color plastic part is formed, the irregularly shaped nozzles 222 form a reverse snap structure. The irregularly shaped nozzles 222 in the mold-open state participate in the pressing under the pre-tightening force of the pre-tightening force structure, pressing the end of the first color plastic part in the first injection cavity space to prevent the end of the first color plastic part from warping and deforming, which greatly improves the production qualification rate of two-color injection molded products. When forming the second injection cavity space, the ends of the two outward push blocks 26 of the second injection cavity space are inserted into the two irregularly shaped sliders 22 at the bottom, guiding the two irregularly shaped nozzles 222 to exit the end of the second injection cavity space, so as to achieve precise mold closing when the second color plastic part is injected.

[0094] The injection molding process described in this application, except for the first two-color injection molded product which requires two mold closings and two mold openings to obtain a complete two-color part, can produce a complete two-color product in each subsequent production cycle, thus greatly improving production efficiency.

[0095] Specifically, after the second mold closing and injection, each time the semi-finished product of the first color plastic part and the finished product of the two colors remain in the first injection cavity space and the second injection cavity space respectively. After the first injection is completed, the semi-finished product of the first color plastic part moves with the concave mold cavity and participates in the second mold closing and sealing. After the second injection is completed and the finished product is obtained, when the mold is opened, the finished product remains on the convex mold core side and is ejected and removed.

[0096] Regarding the injection molding process, in one embodiment, both the inward push block 21 and the outward push block 26 have unidirectional driving inclined surfaces, and both irregularly shaped sliders 22 have V-grooves 221.

[0097] During mold closing, in the upper mold closing structure, when the inward push block 21 is inserted into the two upper irregularly shaped sliders 22, the unidirectional driving inclined surface of the inward push block 21 is used to guide the irregularly shaped tip 222 of the irregularly shaped slider 22 to move towards the injection molding surface of the concave mold cavity 10, so that the upper irregularly shaped slider 22 moves to the first injection molding position. When the concave mold cavity 10 and the first convex mold core 8-1 are closed, after the unidirectional driving inclined surfaces of the two inward push blocks 21 are inserted into the V-grooves 221 of the two irregularly shaped sliders 22, both irregularly shaped sliders 22 move towards the injection molding surface of the concave mold cavity 10, and the two irregularly shaped tips 222 extend to the front gates of the two hot injection nozzles respectively, participating in the sealing of the end of the first injection cavity space.

[0098] During mold closing, in the lower mold closing structure, when the outward push block 26 engages with the lower irregularly shaped slider 22, the unidirectional driving ramp of the outward push block 26 guides the irregularly shaped tip 222 of the lower irregularly shaped slider 22 to move away from the injection molding surface of the concave mold cavity 10, and the lower irregularly shaped slider 22 moves to the second injection molding position. When the concave mold cavity 10 and the second convex mold core 8-2 are molded together, after the unidirectional driving ramps of the two outward push blocks 26 are inserted into the V-grooves 221 of the two lower irregularly shaped sliders 22, the two irregularly shaped tips 222 exit the end of the second injection cavity space.

[0099] Preferably, the inward push block 21 and the outward push block 26 are installed on the side of the convex model core using screws or press-fit inserts.

[0100] The driving slopes of the two inward push blocks 21 face the injection molding surface and are close to each other; the driving slopes of the two outward push blocks 26 are away from the injection molding surface and the driving slopes of the two inward push blocks 21 are opposite to each other.

[0101] The injection molding process of this application, by matching the unidirectional driving inclined surfaces of the inward push block 21 and the outward push block 26 with the V-groove 221 of the irregular slider 22, can achieve bidirectional driving, that is, close to or far from the injection molding surface, providing a basis for the irregular tip 222 to participate in sealing or not participate in sealing.

[0102] Regarding the injection molding process, in one embodiment, the preload structure adopts a compression spring 25. The compression spring 25 is always in a compressed state, that is, when the irregular slider 22 is not inserted with the inward push block 21 or the outward push block 26, the compression spring 25 can provide preload to the irregular slider 22.

[0103] In the mold parting state, the irregularly shaped sliders 22 maintain or return to the first injection molding position under the preload of the compression springs 25. Specifically, the two irregularly shaped sliders 22 located at the top remain in the first injection molding position after mold parting, while the two irregularly shaped sliders 22 located at the bottom gradually extend from the strongly compressed state after mold parting, and the irregularly shaped sliders 22 return to the first injection molding position.

[0104] In the mold-closed state, in the lower mold-closed structure, the one-way driving inclined surface of the outward push block 26 is used to insert into the V-groove 221 of the irregular slider 22, so that the compression spring 25 is further compressed, the lower irregular slider 22 moves to the second injection molding position, and the irregular tip 222 of the lower irregular slider 22 retracts to the outside of the second injection cavity space.

[0105] When the concave mold cavity 10 and the second convex mold core 8-2 change from the mold-closed state to the mold-open state, the lower irregularly shaped slider 22 returns to the first injection molding position under the action of the compression spring 25.

[0106] In the injection molding process of this application, each irregularly shaped slider 22 is provided with a compression spring 25 on the side away from the irregularly shaped nozzle 222. Under the pre-tightening force of the compression spring 25, the two irregularly shaped sliders 22 at the top are still in the first injection molding position after the mold is opened. The irregularly shaped nozzle 222 presses the two ends of the first colored plastic part. The two ends of the first colored plastic part are warped and deformed and pressed, and cannot be separated from the concave mold cavity 10, and are in a conforming state.

[0107] Regarding the injection molding process, in one embodiment, the mold assembly includes a mold frame 12, two mold cavities 10 are installed in the mold frame 12, and the mold frame 12 is rotatable along a rotation center line.

[0108] The concave mold cavity 10 has right-angle notches on its upper and lower sides of the injection molding surface. Four limiting blocks 24 are fixedly installed on the concave mold frame 12. The four limiting blocks 24 and the four right-angle notches of the two concave mold cavities 10 all form receiving grooves with openings facing the convex mold core. The receiving groove structure is used to accommodate the up-and-down sliding of the irregularly shaped slider 22. One end of the compression spring 25 is fixed to the side of the irregularly shaped slider 22 facing away from the irregularly shaped tip 222, and the other end is fixed to the limiting block 24.

[0109] Regarding the injection molding process, in one embodiment, a guide plate 23 is provided on the side of each irregularly shaped slider 22 facing away from the V-groove 221, and a pressure plate 27 is provided parallel to the guide plate 23. The pressure plate 27 presses the irregularly shaped slider 22 tightly against the guide plate 23. Specifically, both the guide plate 23 and the pressure plate 27 are disposed in a receiving groove. The guide plate 23 is used to guide the irregularly shaped slider 22, and the pressure plate 27 is used to press the irregularly shaped slider 22 tightly against the guide plate 23 to prevent the irregularly shaped slider 22 from tipping over when sliding up and down.

[0110] The complete process flow is as follows:

[0111] like Figure 5 As shown, when the mold is first installed and closed for the first time, the inward push block 21 drives the irregularly shaped slider 22 to move toward the injection surface of the concave mold cavity 10 due to the mold closing driving force. The irregularly shaped tip 222 participates in sealing. The irregularly shaped tip 222 of the irregularly shaped slider 22, together with the concave mold cavity 10 and the first convex mold core 8-1, constitutes the first injection cavity space of the first colored plastic part. The molten plastic enters the second flow channel 2-2 and the second hot nozzle 3-2 of the hot runner system through the second positioning ring 1-2. The valve needle of the hot runner system controlled by the second oil cylinder 5-2 retracts to the right, and the gate at the front of the second hot nozzle 3-2 opens. The molten plastic enters the closed first injection cavity space composed of the concave mold cavity 10, the first convex mold core 8-1, and the irregularly shaped tips 222 of the two irregularly shaped sliders 22. At this time, the first injection molding is completed, and the first colored plastic part is obtained. At the same time, the second injection cavity space does not perform injection action.

[0112] like Figure 6 As shown, after the first colored plastic portion is injected, the die assembly, driven by the mold opening mechanism of the injection molding machine, moves to the left along the arrow. At this time, the two upper irregularly shaped sliders 22 disengage from the one-way drive ramp of the inward push block 21 and remain stationary in the first injection molding position under the pre-tightening force of the compression spring 25. During the mold opening movement of the die assembly to the left, the rotating wheel of the injection molding machine drives the die assembly to rotate 180 degrees along the horizontal rotation axis of the injection molding machine, while the punch assembly remains fixed on the injection molding machine. At this time, the position of the inward push block 21 remains unchanged, and the two upper irregularly shaped sliders 22 and the two lower irregularly shaped sliders 22 rotate and exchange positions. During this rotation, the two irregularly shaped sliders 22 involved in the sealing injection molding do not detach from the first color plastic part under the pre-compression force of the compression spring 25, that is, they are still in the pressing state. The irregularly shaped nozzles 222 press the two ends of the first color plastic part. Therefore, the warped deformation of the two ends of the first color plastic part is suppressed and cannot detach from the concave mold cavity 10, and is in a conforming state.

[0113] like Figure 7 As shown, after the mold completes its first opening and rotation process, the cavity mold assembly moves to the right again along the arrow to close the mold under the drive of the injection molding machine's mold closing mechanism. During this process, the compression spring 25 changes from a strongly compressed state to a lightly compressed state. Under the pre-compression force of the compression spring 25, the two irregularly shaped sliders 22, which are separated from the two outward push blocks 26, move towards the injection molding surface of the cavity mold 10, and the two irregularly shaped sliders move to the first injection molding position. At the same time, the two irregularly shaped sliders 22, which have rotated to the upper end, are inserted into the V-groove 221 by the unidirectional drive inclined surface of the inward push block 21, further ensuring that the irregularly shaped sliders 22 move to the first injection molding position and complete the upper part of the injection molding process. Figure 5During the sealing process, the irregularly shaped nozzle 222, together with the concave mold cavity 10 and the first convex mold core 8-1, once again form the first injection cavity space. At the same time, the two irregularly shaped sliders 22, which rotate to the lower end, move away from the injection molding surface of the concave mold cavity 10 under the driving action of the outward push block 26 with the driving surface facing outward. At the moment when the concave mold cavity 10 and the second convex mold core 8-2 are molded together, the irregularly shaped nozzles 222 of the two irregularly shaped sliders 22 completely detach from the first colored plastic part. At this time, the second mold closing action is completed. The design is ingenious. While ensuring accurate mold closing, it can effectively prevent the two ends of the first colored plastic part from warping and deforming.

[0114] After the second mold closing action is completed, the two nozzles of the injection molding machine inject black glue into the first positioning ring 1-1 and white glue into the second positioning ring 1-2, respectively. After injection molding is completed in the upper first injection cavity space, the result is as shown above. Figure 5 The first colored plastic portion shown, after injection molding in the lower second injection cavity space, results in the following: Figure 7 The product shown is a complete two-color product containing a first-color plastic part and a second-color plastic part. At this time, the first injection cavity space at the upper end has completed the injection molding of the first-color plastic part, while the lower end has completed the injection molding of the second-color plastic part.

[0115] After the mold is opened again, a complete two-color product can be obtained at the same time as the semi-finished product of the first color plastic part. The complete two-color product remains on the second convex mold core 8-2 at the lower end of the mold and is ejected under the action of the ejection mechanism of the mold. Meanwhile, the semi-finished product of the first color plastic part at the upper end moves to the left and rotates with the injection molding machine along with the concave mold cavity 10. At the same time, the robot grabs the two-color product on the second convex mold core 8-2 at the lower end, completing one production cycle and entering the next production cycle.

[0116] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and 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, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0117] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0118] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A rotary inverted mold structure for two-color injection molding, comprising a cavity mold assembly and a punch assembly, wherein the punch assembly comprises a first punch core (8-1) located at the upper part and a second punch core (8-2) located at the lower part, characterized in that: The concave mold assembly can rotate along a horizontal rotation axis and includes two concave mold cavities (10); before rotation and after rotation by 180 degrees, the two concave mold cavities (10) can simultaneously mold with the first convex mold core (8-1) to form a first injection cavity space and with the second convex mold core (8-2) to form a second injection cavity space. The first convex mold core (8-1) has two inward push blocks (21) on the upper and lower sides of the injection molding surface facing the concave mold cavity (10); the second convex mold core (8-2) has two outward push blocks (26) on the upper and lower sides of the injection molding surface facing the concave mold cavity (10). Each of the concave mold cavities (10) has two vertically sliding irregularly shaped sliders (22) on the upper and lower sides of its injection molding surface. The irregularly shaped sliders (22) are provided with irregularly shaped nozzles (222) facing the injection molding surface of the concave mold cavity (10), and the irregularly shaped sliders (22) are provided with a pre-tightening structure on the side facing away from the irregularly shaped nozzles (222). The ends of the two inward push blocks (21) in the first injection cavity space are inserted into the two upper irregular sliders (22), and the two corresponding irregular tips (222) participate in the sealing of the end of the first injection cavity space; and the irregular tips (222) in the mold-open state participate in pressing the end of the first colored plastic part in the first injection cavity space under the action of the pre-tightening force structure; the ends of the two outward push blocks (26) in the second injection cavity space are inserted into the two lower irregular sliders (22), and the two corresponding irregular tips (222) are located outside the second injection cavity space.

2. The rotary inverted mold structure for two-color injection molding as described in claim 1, characterized in that: Both the inward push block (21) and the outward push block (26) have unidirectional driving inclined surfaces; both the irregularly shaped sliders (22) have V-shaped grooves (221); When the inward push block (21) is inserted into the upper irregular slider (22), the one-way driving slope of the inward push block (21) is used to guide the corresponding irregular tip (222) to move towards the injection molding surface close to the concave mold cavity (10); When the outward push block (26) is inserted into the lower irregular slider (22), the unidirectional driving slope of the outward push block (26) is used to guide the corresponding irregular tip (222) to move away from the injection molding surface of the concave mold cavity (10).

3. The rotary inverted mold structure for two-color injection molding as described in claim 2, characterized in that: The preload structure uses a compression spring (25); In the mold parting state, the two irregularly shaped sliders (22) at the top remain stationary in the first injection molding position under the preload of the compression spring (25); The concave mold cavity (10) and the second convex mold core (8-2) are in the mold-closing state. The one-way driving slope of the outward push block (26) is used to insert into the V-groove (221) of the lower irregular slider (22) to cause the compression spring (25) to compress. The irregular tips (222) of the two lower irregular sliders (22) are located outside the second injection cavity space.

4. The rotary inverted mold structure for two-color injection molding as described in claim 3, characterized in that: The die assembly includes a die frame (12), two die cavities (10) are installed in the die frame (12), and the die frame (12) can rotate along the rotation center line; the die cavity (10) has right angle notches on the upper and lower sides of its injection molding surface; The concave mold frame (12) is fixedly provided with four limiting blocks (24). The four limiting blocks (24) and the four right-angle notches of the two concave mold cavities (10) all form receiving grooves with openings facing the convex mold core. The receiving groove structure is used to accommodate the irregular slider (22) to slide up and down. One end of the compression spring (25) is fixed to the side of the irregular slider (22) away from the irregular tip (222), and the other end is fixed to the limiting block (24).

5. The rotary inverted mold structure for two-color injection molding as described in claim 2, characterized in that: Each of the irregularly shaped sliders (22) has a guide plate (23) on the side facing away from the V-groove (221), and a pressure plate (27) is provided parallel to the guide plate (23). The pressure plate (27) presses the irregularly shaped slider (22) tightly against the guide plate (23).

6. An injection molding process for two-color injection molding production, characterized in that, Using the rotary inverted mold structure as described in claim 1, with the first convex mold core (8-1) located at the upper part and the second convex mold core (8-2) located at the lower part, the injection molding process includes the following steps: During the first mold closing, the ends of the two inward push blocks (21) are inserted into the two upper irregular sliders (22) to ensure that the two upper irregular sliders (22) reach the first injection molding position. The irregular tips (222) of the two upper irregular sliders (22), together with the concave mold cavity (10) and the first convex mold core (8-1), constitute the first injection cavity space located in the upper part for producing the first colored plastic part. Molten plastic enters the first injection cavity space and is injection molded into the first colored plastic portion; The die assembly opens and rotates 180 degrees, switching the upper and lower positions of the two die cavities (10); during this process, the two irregularly shaped sliders (22) originally located at the upper part remain stationary in the first injection molding position under the action of the pre-tightening force structure; the two irregularly shaped sliders (22) originally located at the lower part move to the first injection molding position under the action of the pre-tightening force structure. In the second mold closing, in the upper mold closing structure, the irregular tip (222) of the irregular slider (22), together with the concave mold cavity (10) and the first convex mold core (8-1), constitutes the first injection cavity space located in the upper part for producing the first colored plastic part, and the first colored plastic part is injection molded; at the same time, in the lower mold closing structure, the ends of the two outward push blocks (26) are inserted into the two irregular sliders (22) and the two irregular tips (222) are retracted to the outside of the second injection cavity space, and the second colored plastic part is injection molded in the second injection cavity space based on the first colored plastic part.

7. The injection molding process for two-color injection molding as described in claim 6, characterized in that: Both the inward push block (21) and the outward push block (26) have unidirectional driving inclined surfaces; both the irregularly shaped sliders (22) have V-shaped grooves (221); When the mold is closed, in the upper mold closing structure, the inward push block (21) is inserted into the upper irregular slider (22). The one-way driving slope of the inward push block (21) is used to guide the irregular tip (222) of the irregular slider (22) to move towards the injection molding surface close to the concave mold cavity (10) until the upper irregular slider (22) moves to the first injection molding position. Meanwhile, in the lower mold closing structure, the outward push block (26) is inserted into the lower irregular slider (22), and the unidirectional driving inclined surface of the outward push block (26) guides the irregular tip (222) to move away from the injection molding surface of the concave mold cavity (10), and the lower irregular slider (22) moves to the second injection molding position.

8. The injection molding process for two-color injection molding as described in claim 7, characterized in that: The preload structure uses a compression spring (25); In the mold parting state, the irregularly shaped slider (22) maintains or returns to the first injection molding position under the preload of the compression spring (25); In the mold closing state, in the lower mold closing structure, the one-way driving inclined surface of the outward push block (26) is used to insert into the V-groove (221) of the irregular slider (22) so that the compression spring (25) is compressed, the lower irregular slider (22) moves to the second injection molding position, and the corresponding two irregular tips (222) retract to the outside of the second injection cavity space.

9. The injection molding process for two-color injection molding as described in claim 8, characterized in that: The die assembly includes a die frame (12), two die cavities (10) are installed in the die frame (12), and the die frame (12) can rotate along the rotation center line; the die cavity (10) has right angle notches on the upper and lower sides of its injection molding surface; The concave mold frame (12) is fixedly provided with four limiting blocks (24). The four limiting blocks (24) and the four right-angle notches of the two concave mold cavities (10) all form receiving grooves with openings facing the convex mold core. The receiving groove structure is used to accommodate the irregularly shaped slider (22) that slides up and down. One end of the compression spring (25) is fixed to the side of the irregularly shaped slider (22) away from the irregularly shaped tip (222), and the other end is fixed to the limiting block (24).

10. The injection molding process for two-color injection molding production as described in claim 7, characterized in that: Each of the irregularly shaped sliders (22) has a guide plate (23) on the side facing away from the V-groove (221), and a pressure plate (27) is provided parallel to the guide plate (23). The pressure plate (27) presses the irregularly shaped slider (22) tightly against the guide plate (23).

Images