IML (in-mold labeling) injection molding equipment and process for automotive upholstery

Abstract

The invention discloses IML injection molding equipment and process for automotive upholstery, and belongs to the technical field of injection molding equipment. The IML injection molding equipment comprises an injection table frame, an injection molding die, a plurality of corner diaphragm grooves and a plurality of sections of corner injection positioning molding assemblies; wherein the multi-section corner injection positioning forming assembly comprises a plurality of arc-shaped positioning blocks, upper corner positioning blocks and lower corner positioning blocks, the top end of each arc-shaped positioning block is fixedly connected with the corresponding upper corner positioning block, and the bottom end of each arc-shaped positioning block is fixedly connected with the corresponding lower corner positioning block. The multi-section corner injection positioning forming assembly has the advantages that the multi-section corner injection positioning forming assembly is suitable for dynamic positioning of a multi-section arc corner of a complex structure, wrinkles and dislocation of a multi-section arc corner area are avoided, the injection forming precision of automotive upholstery is greatly improved, and the yield is greatly improved; therefore, the problems that the integral molding precision of the interior trim part is reduced and the injection molding yield is reduced due to the fact that multiple sections of arc corner areas are directly wrinkled and staggered due to deviation are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of injection molding equipment, and particularly relates to an IML injection molding equipment and process for automotive interior parts. Background Art

[0002] IML is the abbreviation of in-mold labeling, which is an innovative process that combines film decoration and injection molding. Its core principle is to produce a pattern layer on a transparent film substrate through screen printing, then embed the film into an injection mold for injection molding, and integrally form with molten plastic to finally form a composite structure with a transparent film on the surface, a printed pattern in the middle, and a plastic layer on the back.

[0003] In the existing published literature, the invention patent with the patent publication number CN118181639A discloses a plastic injection molding equipment. This injection molding technology preheats and dries the raw materials by using the recovered heat through a drying circuit, reducing defects such as bubbles and silver streaks that may occur during the molding process. The effective utilization of the waste heat of the equipment not only avoids additional energy consumption but also ensures the quality of the products. However, this injection molding technology still has the following defects.

[0004] In the in-mold labeling injection molding of automotive interior parts, it is necessary to accurately position the interior film sheet to the designated area of the mold. However, complex automotive interior parts often contain multiple arc-shaped corners. During mold closing and injection, the impact force generated by the high-pressure filling of molten plastic and the local stress concentration of the mold structure are likely to cause the film sheet to slip or twist at the corners, resulting in positioning deviation. Such deviation will directly cause wrinkles and misalignments in the multiple arc-shaped corner areas, leading to a decrease in the overall molding accuracy of the interior parts and a reduction in the qualified rate of injection molding. Summary of the Invention

[0005] To achieve the above object, the present invention provides the following technical solution: An IML injection molding device for automotive interior parts, comprising an injection table frame, an injection molding die, and a plurality of corner film piece grooves. The injection molding die is fixed on one side of the injection table frame. Both of the two corner film piece grooves are opened on the inner wall of the injection molding die. A multi-stage corner injection positioning and forming assembly is provided inside the corner film piece groove. The multi-stage corner injection positioning and forming assembly includes a plurality of arc-shaped positioning blocks slidably arranged inside the corner film piece groove. At the top of each arc-shaped positioning block, an upper corner positioning block is fixedly connected. At the bottom of the arc-shaped positioning block, a lower corner positioning block is fixedly connected. On one side of the outer wall of the arc-shaped positioning block, an arc-shaped groove bar is slidably connected. The arc-shaped groove bar is fixedly connected to the injection molding die. A guiding groove is opened inside the arc-shaped groove bar. An arc-shaped block is slidably connected inside the guiding groove. The arc-shaped block is fixedly connected to the arc-shaped positioning block. A spring piece is installed on one side of the arc-shaped block. The spring piece is fixedly connected to the arc-shaped groove bar. A side arc groove is opened on one side of the spring piece. A spring piece is installed on one side of the arc-shaped block. When the arc-shaped block is stressed and squeezes the spring piece, one end of the spring piece and the arc-shaped block move along an arc path. The upper corner positioning block and the lower corner positioning block are both slidably connected to the injection molding die to which the corner film piece groove belongs. The outer walls of the upper corner positioning block and the lower corner positioning block are both smooth surfaces.

[0006] When this technology is used in injection molding, the right side of the pressing die will squeeze a plurality of arc-shaped positioning blocks, and the arc-shaped blocks move along the guiding groove inside the arc-shaped groove bar in an arc path. The spring pieces are deformed, and at the same time, the arc-shaped positioning blocks move along the arc path on the outer wall of the arc-shaped groove bar. The arc-shaped positioning blocks drive the upper corner positioning blocks to squeeze the two upper corner positions at the end of the interior decoration film piece along the arc path. The arc-shaped positioning blocks will simultaneously drive the lower corner positioning blocks to squeeze the two lower corner positions at the end of the interior decoration film piece along the arc path.

[0007] Preferably, one end of the arc-shaped positioning block is fixedly connected with a corner inner limit block; a corner support block is arranged below the corner inner limit block. The corner support block is fixedly connected to the lower corner positioning block. A corner pressing block is arranged above the corner inner limit block. The corner pressing block is fixedly connected to the arc-shaped positioning block. A fitting convex block is arranged on one side of the corner pressing block. The fitting convex block is fixedly connected to the upper corner positioning block. A corner fitting block is installed on one side of the fitting convex block. The corner fitting block is fixedly connected to the upper corner positioning block. There are gaps between the corner inner limit block, the corner support block, the corner pressing block, the fitting convex block, and the corner fitting block and the corner film piece groove. The outer walls of the corner support block and the corner inner limit block are both smooth surfaces. The vertical cross-sectional shape of the corner inner limit block is L-shaped. The outer walls of the corner pressing block and the fitting convex block are both smooth surfaces. The vertical cross-sectional shape of the corner pressing block is L-shaped.

[0008] When this technology is used in injection molding, there are gaps between the inner corner limit block, the corner support block, the corner pressing block, the fitting convex block, and the corner fitting block and the corner film groove. While the arc-shaped positioning block moves along the arc path, it will drive the inner corner limit block to move along the arc path. The lower corner positioning block and the corner support block limit and fit the inner wall at the two lower corner positions of the end of the interior film sheet in the gap. The upper corner positioning block will drive the corner fitting block to move along the arc path. The corner fitting block, the fitting convex block, and the corner pressing block limit and fit the inner wall at the two upper corner positions of the end of the interior film sheet in the gap.

[0009] Preferably, a pressing mold is provided on one side of the injection molding die; a controller is fixedly installed on one side of the pressing mold. Guide columns are fixedly connected at positions near the four corner lines on one side of the controller. A plurality of the guide columns are slidably connected to the injection table frame. A push plate is fixedly connected to the outer wall of the guide column away from the controller. A pushing electric cylinder is installed in the middle of one side of the push plate. The outer wall of the pushing electric cylinder is fixedly connected to the injection table frame.

[0010] Two injection heads are provided above the injection molding die. A push rod is fixedly installed at the top of each injection head. A push sleeve plate is provided at the top of the push rod. The two push rods are fixedly connected to the push sleeve plate. A support plate is installed above the push sleeve plate. A docking electric cylinder is fixedly connected to the upper surface of the support plate. The pushing electric cylinder and the docking electric cylinder are electrically connected to the controller. The output end of the docking electric cylinder is fixedly connected to the push sleeve plate. Guide rods are fixedly connected near both ends of the support plate. The push sleeve plate is slidably connected to the guide rods. The injection table frame is fixedly connected to the guide rods. The two push rods are slidably connected to the injection table frame. The outer wall of each push rod is a smooth surface.

[0011] When this technology is used in injection molding, the pushing electric cylinder is started through the controller, and the push plate moves to the right along the inner wall of the injection table frame. The push plate drives a plurality of guide columns to move to the right, and the guide columns drive the controller to move to the right. The push sleeve plate slides downward along the outer wall of the guide rod. The injection table frame supports the guide rod, and the support plate supports the docking electric cylinder. The push sleeve plate will drive the two push rods to move downward synchronously. The two push rods slide downward along the inside of the injection table frame. The two injection heads are docked at the injection positions on the top of the injection molding die to achieve injection molding.

[0012] An IML injection molding process for automotive interior parts, the process includes the following steps: Step 1: Curve positioning and placement of the interior film sheet. The interior film sheet is extruded into the corner film groove inside the injection molding die for positioning and placement operations; Step 2: Multi-segment corner injection positioning. The mold is closed on the injection molding die, and multi-segment corner arc positioning is performed on the end of the interior trim film inside the corner film slot. Step 3: Multi-segment corner arc limiting. The lower corner positioning block and the corner support block limit and fit the inner wall at the two lower corner positions of the end of the interior trim film in the gap, and the corner fitting block, the fitting convex block and the corner pressing block limit and fit the two upper corner positions of the interior trim film in the gap. Step 4: Injection molding. The docking electric cylinder pushes the push sleeve plate downward, and the two injection heads are docked at the top injection position of the injection molding die to inject and mold the plastic hot melt liquid in contact with the interior trim film into an automotive interior part.

[0013] The present invention has the following advantages: 1. Through the multi-segment corner injection positioning and forming assembly of the present invention, the pressing mold squeezes the arc positioning block, so that the arc positioning block drives the arc block to move along the arc path inside the guide groove, and squeezes the elastic piece and the side arc groove to cause extrusion deformation on the arc path, so that the arc positioning block synchronously drives the upper corner positioning block and the lower corner positioning block to accurately squeeze the four corner positions of the end of the interior trim film along the arc path respectively, which is suitable for the dynamic positioning of complex structure multi-segment arc corners, avoids the occurrence of wrinkles and misalignments in the multi-segment arc corner area, greatly improves the injection molding accuracy of automotive interior parts, and significantly improves the qualified rate. 2. Through the linkage of the arc positioning block with the corner inner limiting block and the corner support block, the present invention realizes the arc envelope fitting of the two lower corner inner walls of the end of the interior trim film, and the corner pressing block, the corner fitting block and the fitting convex block realize the curved surface fitting limit of the two upper corner inner walls of the end of the interior trim film, which can cover the full-dimensional space limit of the four corners of the end of the interior trim film, especially adapts to the anti-slip requirement under the injection molding of multi-curved surface interior trim films, and significantly improves the qualified rate of injection molding in the multi-segment arc corner area of automotive interior parts.

[0014] In summary, first, the arc positioning block synchronously drives the upper corner positioning block and the lower corner positioning block to accurately squeeze the four corner positions of the end of the interior trim film along the arc path respectively. At the same time, the arc positioning block is linked with the corner inner limiting block and the corner support block to realize the arc envelope fitting of the two lower corner inner walls of the end of the interior trim film, and the corner pressing block, the corner fitting block and the fitting convex block realize the curved surface fitting limit of the two upper corner inner walls of the end of the interior trim film. In summary, the full-dimensional space limit of the four corners of the end of the interior trim film is realized, and at the same time, the multi-dimensional curved surface fitting limit is realized, and the synchronous and consistent multi-point limit treatment is carried out, so that the multi-segment arc corner area avoids wrinkles and misalignments, and greatly improves the injection molding accuracy of automotive interior parts. Description of the Drawings

[0015] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings described below are only exemplary. For those of ordinary skill in the art, without creative efforts, other implementation drawings can also be obtained based on the provided drawings.

[0016] The structures, ratios, sizes, etc. shown in this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention. Therefore, they do not have substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope that can be covered by the technical content disclosed in the present invention.

[0017] Figure 1 It is the front view structure schematic diagram of the IML injection molding equipment for automotive interior parts of the present invention; Figure 2 It is the structure schematic diagram of the injection molding die of the present invention; Figure 3 It is the partial structure schematic diagram of the connection between the injection molding die and the arc-shaped groove strip of the present invention; Figure 4 It is the partial cross-sectional structure schematic diagram of the arc-shaped positioning block of the present invention; Figure 5 It is the partial structure schematic diagram of the connection between the upper corner positioning block and the arc-shaped positioning block of the present invention; Figure 6 It is the vertical cross-sectional structure schematic diagram of the injection molding die of the present invention; Figure 7 For the present invention Figure 6 The enlarged structure schematic diagram at position A in; Figure 8 It is the partial structure schematic diagram of the connection between the pushing electric cylinder and the injection table frame of the present invention; Figure 9 It is the truncated partial structure schematic diagram of the connection between the injection table frame and the guide rod of the present invention; In the figure: 1. Injection table frame; 2. Injection molding die; 3. Corner film slot; 4. Arc-shaped positioning block; 5. Upper corner positioning block; 6. Lower corner positioning block; 7. Arc-shaped groove strip; 8. Arc-shaped block; 9. Guide groove; 10. Elastic piece; 11. Side arc groove; 12. Corner inner limit block; 13. Corner support block; 14. Corner pressing block; 15. Fitting convex block; 16. Corner fitting block; 17. Pressing die; 18. Controller; 19. Guide post; 20. Push plate; 21. Pushing electric cylinder; 22. Injection head; 23. Push rod; 24. Push sleeve plate; 25. Support plate; 26. Docking electric cylinder; 27. Guide rod. Specific embodiments

[0018] The following specific embodiments illustrate the implementation manners of the present invention. Those skilled in the art can easily understand the other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0019] As Figure 1 - Figure 9 shown, an IML injection molding device for automotive interior parts is provided. The IML injection molding device for automotive interior parts is provided with multiple sections of corner injection positioning and forming components. The setting of the multiple sections of corner injection positioning and forming components can accurately extrude the four corner positions of the end of the interior film sheet along an arc path, which is suitable for the dynamic positioning of multiple arc corners with complex structures, avoiding the occurrence of wrinkles and misalignments in the multiple arc corner areas, greatly improving the injection molding accuracy of automotive interior parts, and significantly improving the yield rate. The specific structural settings of the multiple sections of corner injection positioning and forming components are as follows.

[0020] In this embodiment, as Figure 1 - Figure 4 shown, the injection molding die 2 is fixed on one side of the injection table frame 1. A plurality of corner film sheet grooves 3 are opened on the inner wall of the injection molding die 2. A multiple sections of corner injection positioning and forming components are arranged inside the corner film sheet grooves 3; the multiple sections of corner injection positioning and forming components include a plurality of arc-shaped positioning blocks 4 slidably arranged inside the corner film sheet grooves 3. The top end of each arc-shaped positioning block 4 is fixedly connected with an upper corner positioning block 5, and the bottom end of the arc-shaped positioning block 4 is fixedly connected with a lower corner positioning block 6.

[0021] One side of the outer wall of the arc-shaped positioning block 4 is slidably connected with an arc-shaped groove strip 7. The arc-shaped groove strip 7 is fixedly connected with the injection molding die 2. A guiding groove 9 is opened inside the arc-shaped groove strip 7. An arc-shaped block 8 is slidably connected inside the guiding groove 9. The arc-shaped block 8 is fixedly connected with the arc-shaped positioning block 4; A spring piece 10 is installed on one side of the arc-shaped block 8. The arc-shaped block 8 is forced to squeeze the spring piece 10, so that one end of the spring piece 10 and the arc-shaped block 8 move along an arc path. The spring piece 10 is fixedly connected with the arc-shaped groove strip 7, and a side arc groove 11 is opened on one side of the spring piece 10. Both the upper corner positioning block 5 and the lower corner positioning block 6 are slidably connected with the injection molding die 2 to which the corner film sheet groove 3 belongs, and the outer walls of the upper corner positioning block 5 and the lower corner positioning block 6 are smooth surfaces.

[0022] In this embodiment, as Figure 4 - Figure 7As shown, one end of the arc positioning block 4 is fixedly connected with an inner corner limiting block 12; a corner supporting block 13 is arranged below the inner corner limiting block 12, and the corner supporting block 13 is fixedly connected with the lower corner positioning block 6. An upper corner pressing block 14 is arranged above the inner corner limiting block 12, and the upper corner pressing block 14 is fixedly connected with the arc positioning block 4. A fitting convex block 15 is arranged on one side of the upper corner pressing block 14, and the fitting convex block 15 is fixedly connected with the upper corner positioning block 5; a corner fitting block 16 is installed on one side of the fitting convex block 15, and the corner fitting block 16 is fixedly connected with the upper corner positioning block 5. There are gaps between the inner corner limiting block 12, the corner supporting block 13, the upper corner pressing block 14, the fitting convex block 15 and the corner fitting block 16 and the corner film sheet groove 3. The outer walls of the corner supporting block 13 and the inner corner limiting block 12 are both smooth surfaces, and the vertical cross-sectional shape of the inner corner limiting block 12 is L-shaped. The outer walls of the upper corner pressing block 14 and the fitting convex block 15 are both smooth surfaces, and the vertical cross-sectional shape of the upper corner pressing block 14 is L-shaped.

[0023] In this embodiment, as Figure 8 - Figure 9 shown, a pressing die 17 is arranged on one side of the injection molding die 2; a controller 18 is fixedly installed on one side of the pressing die 17, and guide columns 19 are fixedly connected at positions near the four corner lines on one side of the controller 18. The plurality of guide columns 19 are all slidably connected with the injection table frame 1. A push plate 20 is fixedly connected to the outer wall of the guide column 19 and away from the controller 18. A pushing electric cylinder 21 is installed in the middle of one side of the push plate 20, and the outer wall of the pushing electric cylinder 21 is fixedly connected with the injection table frame 1.

[0024] Two injection heads 22 are arranged above the injection molding die 2. A push rod 23 is fixedly installed at the top of each injection head 22. A push sleeve plate 24 is arranged at the top of the push rod 23, and the two push rods 23 are both fixedly connected with the push sleeve plate 24. A support plate 25 is installed above the push sleeve plate 24. A docking electric cylinder 26 is fixedly connected to the upper surface of the support plate 25. The pushing electric cylinder 21 and the docking electric cylinder 26 are both electrically connected to the controller 18. The output end of the docking electric cylinder 26 is fixedly connected with the push sleeve plate 24. Guide rods 27 are fixedly connected near both ends of the support plate 25.

[0025] The push sleeve plate 24 is slidably connected to the guide rod 27, and the injection table frame 1 is fixedly connected to the guide rod 27. Both push rods 23 are slidably connected to the injection table frame 1, and the outer wall of each push rod 23 is a smooth surface, so as to facilitate the electric cylinder 21 to push the push plate 20 to move rightward. The push plate 20 moves rightward along the inner wall of the injection table frame 1. At the same time, the push plate 20 drives a plurality of guide columns 19 to move rightward. The guide columns 19 move rightward along the inside of the injection table frame 1. The guide columns 19 drive the controller 18 to move rightward. The controller 18 drives the compression mold 17 to move rightward. The compression mold 17 is butted against the injection molding die 2 to perform mold closing, realizing mold closing butt extrusion. After the mold closing, the butt electric cylinder 26 is pushed to drive the push sleeve plate 24 to move downward. The push sleeve plate 24 slides downward along the outer wall of the guide rod 27. The guide rod 27 supports the support plate 25. The push sleeve plate 24 will drive the two push rods 23 to move downward synchronously. The two push rods 23 slide downward along the inside of the injection table frame 1. The two injection heads 22 are butted at the top injection position of the injection molding die 2 to realize the injection molding operation.

[0026] The use process of the IML injection molding equipment for automobile interior parts of the present invention is as follows: First, when the interior film sheet of the present invention is positioned and placed in a curve, the plastic hot melt pipeline is butted against the outer wall side surfaces of the two injection heads 22, and then the automobile interior film sheet is placed in the corner film sheet groove 3 inside the injection table frame 1. At the same time, the interior film sheet is extruded into the corner film sheet groove 3 inside the injection molding die 2.

[0027] Second, when the present invention performs multi-segment corner injection positioning, the push electric cylinder 21 is started through the controller 18. The push electric cylinder 21 pushes the push plate 20 to move rightward. The push plate 20 moves rightward along the inner wall of the injection table frame 1. At the same time, the push plate 20 drives a plurality of guide columns 19 to move rightward. The guide columns 19 move rightward along the inside of the injection table frame 1. The guide columns 19 drive the controller 18 to move rightward. The controller 18 drives the compression mold 17 to move rightward. The compression mold 17 is butted against the injection molding die 2 to perform mold closing. In this way, the right side surface of the compression mold 17 will squeeze a plurality of arc-shaped positioning blocks 4. The arc-shaped positioning blocks 4 are stressed and drive the arc-shaped blocks 8 to move along an arc path. The arc-shaped blocks 8 move along the guide groove 9 inside the arc-shaped groove strip 7 in an arc path. At the same time, the arc-shaped blocks 8 squeeze the elastic pieces 10. The elastic pieces 10 undergo arc-shaped deformation, and the side arc groove 11 area on the elastic pieces 10 also deforms, so that one end of the elastic piece 10 undergoes arc-shaped path extrusion movement after contacting the arc-shaped block 8, and the other end of the elastic piece 10 provides a supporting force inside the arc-shaped groove strip 7. The arc-shaped positioning blocks 4 simultaneously move along the outer wall arc path of the arc-shaped groove strip 7. The arc-shaped positioning blocks 4 move along the inner arc path of the corner film sheet groove 3. The arc-shaped positioning blocks 4 drive the upper corner positioning blocks 5 to squeeze the two upper corner positions of the end of the interior film sheet along the arc path. The arc-shaped positioning blocks 4 will simultaneously drive the lower corner positioning blocks 6 to squeeze the two lower corner positions of the end of the interior film sheet along the arc path, so as to perform multi-segment corner arc positioning on the end of the interior film sheet inside the corner film sheet groove 3.

[0028] Meanwhile, when the multi-segment corner arc limiting is carried out in the present invention, since there are gaps between the corner inner limiting block 12, the corner supporting block 13, the corner pressing block 14, the fitting convex block 15 and the corner fitting block 16 and the corner film slot 3, when the arc-shaped positioning block 4 moves along the arc path, it will drive the corner inner limiting block 12 to move along the arc path, and the lower corner positioning block 6 will drive the corner supporting block 13 to move along the arc path. The lower corner positioning block 6 and the corner supporting block 13 limit and fit the inner wall at the two lower corner positions of the end part of the interior trim film in the gap. At the same time, the upper corner positioning block 5 will drive the corner fitting block 16 to move along the arc path, the upper corner positioning block 5 can also drive the fitting convex block 15 to move along the arc path, and the arc-shaped positioning block 4 drives the corner pressing block 14 to move along the arc path. In this way, the corner fitting block 16, the fitting convex block 15 and the corner pressing block 14 limit and fit the inner wall at the two upper corner positions of the end part of the interior trim film in the gap.

[0029] Finally, when the injection molding is carried out in the present invention, until the left side of the injection table frame 1 is completely attached to the right side of the pressing mold 17, the docking electric cylinder 26 is started through the controller 18. The docking electric cylinder 26 pushes the push sleeve plate 24 to move downward. The push sleeve plate 24 slides downward along the outer wall of the guide rod 27. At the same time, the injection table frame 1 supports the guide rod 27, the guide rod 27 supports the support plate 25, and the support plate 25 supports the docking electric cylinder 26. The push sleeve plate 24 will drive the two push rods 23 to move downward synchronously. The two push rods 23 slide downward along the inside of the injection table frame 1. The two push rods 23 respectively drive the two injection heads 22 to move downward. The two injection heads 22 are docked at the top injection positions of the injection molding die 2. The plastic hot melt liquid is poured into the injection molding die 2 through the plastic hot melt pipeline for pressure supply. The injection and pressure supply of the plastic hot melt liquid belong to the existing publicly known technology, and there is no excessive description of the existing publicly known technology. Therefore, the injection molding is carried out through the corner film slot ¾. In this way, the plastic hot melt liquid contacts the interior trim film and is formed into an automotive interior part, and then the temperature is reduced and formed through external cooling to complete the injection molding operation of the automotive interior IML. After the injection molding, the arc-shaped positioning block 4 is no longer subjected to force extrusion, and the arc-shaped block 8 is reset by the resilience of the elastic piece 10.

[0030] The content not described in detail in the specification belongs to the prior art well known to those skilled in the art, and the model parameters of each electrical appliance are not specifically limited. Conventional equipment can be used. In the present technical solution, since the electrical control components not mentioned belong to the prior art, they are not shown in the figure and will not be described herein again.

[0031] The present invention has been described in detail above with general descriptions and specific embodiments. However, based on the present invention, some modifications or improvements can be made, which are obvious to those skilled in the art. Therefore, these modifications or improvements made without departing from the spirit of the present invention all fall within the scope of protection required by the present invention.

Claims

1. An IML injection molding device for automotive interior parts, comprising an injection table frame (1), an injection molding die (2), and a plurality of angled cornea piece grooves (3), characterized in that: The injection molding die (2) is fixed on one side of the injection table frame (1), and two of the corner film piece grooves (3) are both opened on the inner wall of the injection molding die (2). A multi-section corner injection positioning and forming assembly is arranged inside the corner film piece groove (3); The multi-section corner injection positioning and forming assembly includes a plurality of arc-shaped positioning blocks (4) slidably arranged inside the corner film piece groove (3). The top end of each arc-shaped positioning block (4) is fixedly connected with an upper corner positioning block (5), the bottom end of the arc-shaped positioning block (4) is fixedly connected with a lower corner positioning block (6), one side of the outer wall of the arc-shaped positioning block (4) is slidably connected with an arc-shaped groove bar (7), the arc-shaped groove bar (7) is fixedly connected with the injection molding die (2), a guide groove (9) is opened inside the arc-shaped groove bar (7), and an arc-shaped block (8) is slidably connected inside the guide groove (9). The arc-shaped block (8) is fixedly connected with the arc-shaped positioning block (4); A spring piece (10) is installed on one side of the arc-shaped block (8). When the arc-shaped block (8) is stressed to squeeze the spring piece (10), one end of the spring piece (10) and the arc-shaped block (8) move along an arc path. The spring piece (10) is fixedly connected with the arc-shaped groove bar (7), and a side arc groove (11) is opened on one side of the spring piece (10).

2. The IML injection molding equipment for automotive interior parts according to claim 1, characterized in that: Both the upper corner positioning block (5) and the lower corner positioning block (6) are slidably connected with the injection molding die (2) to which the corner film piece groove (3) belongs, and the outer walls of the upper corner positioning block (5) and the lower corner positioning block (6) are smooth surfaces.

3. The IML injection molding equipment for automotive interior parts according to claim 2, characterized in that: One end of the arc-shaped positioning block (4) is fixedly connected with a corner inner limit block (12); A corner support block (13) is arranged below the corner inner limit block (12). The corner support block (13) is fixedly connected with the lower corner positioning block (6). A corner pressing block (14) is arranged above the corner inner limit block (12). The corner pressing block (14) is fixedly connected with the arc-shaped positioning block (4). A fitting convex block (15) is arranged on one side of the corner pressing block (14), and the fitting convex block (15) is fixedly connected with the upper corner positioning block (5); A corner fitting block (16) is installed on one side of the fitting convex block (15), and the corner fitting block (16) is fixedly connected with the upper corner positioning block (5). There are gaps between the corner inner limit block (12), the corner support block (13), the corner pressing block (14), the fitting convex block (15), and the corner fitting block (16) and the corner film piece groove (3).

4. The IML injection molding equipment for automotive interior parts according to claim 3, characterized in that: The outer walls of the corner support block (13) and the corner inner limit block (12) are smooth surfaces, and the vertical cross-sectional shape of the corner inner limit block (12) is L-shaped.

5. The IML injection molding equipment for automotive interior parts according to claim 4, characterized in that: The outer walls of the corner pressing block (14) and the fitting convex block (15) are smooth surfaces, and the vertical cross-sectional shape of the corner pressing block (14) is L-shaped.

6. The IML injection molding equipment for automotive interior parts according to claim 5, characterized in that: A pressing die (17) is arranged on one side of the injection molding die (2); One side of the die (17) is fixedly installed with a controller (18). One side of the controller (18) and near the positions of its four corner lines are fixedly connected with guide columns (19). A plurality of the guide columns (19) are all slidably connected with the injection table frame (1). The outer wall of the guide column (19) and away from the controller (18) is fixedly connected with a push plate (20). In the middle of one side of the push plate (20) is installed a push electric cylinder (21). The outer wall of the push electric cylinder (21) is fixedly connected with the injection table frame (1). Above the injection molding die (2) are provided two injection heads (22). The top end of each injection head (22) is fixedly installed with a push rod (23). Above the top end of the push rod (23) is provided a push sleeve plate (24). The two push rods (23) are both fixedly connected with the push sleeve plate (24). Above the push sleeve plate (24) is installed a support plate (25). The upper surface of the support plate (25) is fixedly connected with a docking electric cylinder (26). The push electric cylinder (21) and the docking electric cylinder (26) are both electrically connected with the controller (18). The output end of the docking electric cylinder (26) is fixedly connected with the push sleeve plate (24). Inside the support plate (25) and near its two ends are fixedly connected with guide rods (27). The push sleeve plate (24) is slidably connected with the guide rods (27). The injection table frame (1) is fixedly connected with the guide rods (27).

7. The IML injection molding equipment for automotive interior parts according to claim 6, characterized in that: The two push rods (23) are both slidably connected with the injection table frame (1). The outer wall of each push rod (23) is a smooth surface.

8. An IML injection molding process for automotive interior parts, using the IML injection molding equipment for automotive interior parts described in claim 7, characterized in that: This process includes the following steps: Step 1: Position and place the interior film sheet in a curve. Extrude the interior film sheet into the corner film sheet groove (3) inside the injection molding die (2) for positioning and placing operation. Step 2: Inject and position at multiple corners. The die (17) is docked on the injection molding die (2) for mold closing, and multi-segment corner arc positioning is performed on the end of the interior film sheet inside the corner film sheet groove (3). Step 3: Limit at multiple corner arcs. The lower corner positioning block (6) and the corner support block (13) limit and fit the inner wall at the two lower corner positions of the end of the interior film sheet in the gap. The corner fitting block (16), the fitting convex block (15), and the corner pressing block (14) limit and fit the two upper corner positions of the interior film sheet in the gap. Step 4: Injection molding. The docking electric cylinder (26) pushes the push sleeve plate (24) downward. The two injection heads (22) are docked at the injection positions at the top of the injection molding die (2), and the plastic hot melt is contacted with the interior film sheet for injection molding into an automotive interior part.

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