Zero-gap ejector mechanism for injection mold of automotive door panel trim

Abstract

The zero-gap ejector mechanism for the injection mold of the automotive door panel trim includes a fixed mold clamping plate and a fixed mold plate, a moving mold clamping plate, a runner support and a runner plate, as well as a bottom plate, mold feet and a moving mold plate. There is a product formed by injection molding between the moving mold plate and the fixed mold plate. The product is provided with concave-convex assembly parts, boundary undercuts, fixing stud holes and positioning stud holes. Corresponding concave-convex assembly ejector blocks, boundary ejector blocks and undercut ejector blocks are arranged on the moving mold plate. The concave-convex assembly ejector block is matched with the concave-convex assembly part, the boundary ejector block is matched with the outer side edge of the boundary undercut, and the undercut ejector block is matched with the outer side edge of the boundary undercut. A small ejector block is arranged in the concave-convex assembly ejector block, and the small ejector block is matched with the outer peripheral wall of the fixing stud hole. A stud hole core rod is installed in the concave-convex assembly ejector block, and the core rod is matched with the inner hole wall of the fixing stud hole. A push tube is connected to the lower top plate, and a ejector pin is connected to the bottom plate. The ejector pin passes through the push tube and is matched with the inner hole wall of the positioning stud hole. The concave-convex assembly ejector block surrounds the outer peripheral wall of the positioning stud hole.

Description

Technical Field

[0001] The present invention relates to a zero-step top block mechanism for an injection mold of an automobile door panel decorative part, belonging to the field of injection molds. Background Art

[0002] When producing plastic products, such as plastic products like automobile door panel decorative plates, using injection molds, in order to improve the product grade and enhance the decorative and aesthetic performance, triangular decorative parts are installed on the automobile door panel decorative plates. According to the analysis of the product structure and shape, the decorative plate at the position for installing the triangular decorative part is provided with uneven surface features and assembly structures such as undercuts, snap fits, and fixing stud holes. Traditional molds cannot achieve the molding and demolding of these features and structures. Summary of the Invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a zero-step top block mechanism for an injection mold of an automobile door panel decorative part, which combines inclined tops, straight tops, and ejector pins of ejector sleeves to achieve zero-step molding and demolding of the product, with a smooth and traceless surface of the product, good quality, and high grade.

[0004] The technical solution of the zero-step top block mechanism for the injection mold of the automobile door panel decorative part of the present invention is as follows: It includes a fixed mold clamping plate and a moving mold clamping plate. A fixed template is installed under the fixed mold clamping plate, a runner frame is installed on the moving mold clamping plate, a runner plate is arranged in the runner frame, a bottom plate is installed on the runner frame, mold feet are installed on the bottom plate, a moving template is installed on the mold feet, a mold cavity is arranged between the moving template and the fixed template, and there is an injection-molded product in the mold cavity. The product is provided with concave-convex assembly parts, boundary undercuts, fixing stud holes, and positioning stud holes. A lower top plate, a middle top plate, and an upper top plate are arranged between the mold feet. The feature is that concave-convex assembly top blocks, boundary top blocks, and undercut top blocks corresponding to the concave-convex assembly parts and the boundary undercuts are arranged on the moving template;

[0005] The concave-convex assembly top block cooperates with the concave-convex assembly part. A concave-convex straight ejector rod is connected under the concave-convex assembly top block, and the concave-convex straight ejector rod is connected to the lower top plate;

[0006] The boundary top block cooperates with the outer side edge of the boundary undercut. A boundary straight ejector rod is connected under the boundary top block, and the boundary straight ejector rod is connected to the lower top plate;

[0007] The undercut top block is located below the concave-convex assembly top block. The undercut top block cooperates with the outer side edge of the boundary undercut. An undercut inclined ejector rod is connected under the boundary undercut. An inclined sliding seat is arranged in the middle top plate, and the undercut inclined ejector rod is connected to the inclined sliding seat;

[0008] A small top block is arranged in the concave-convex assembly top block. The head of the small top block extends out of the concave-convex assembly top block and cooperates with the outer peripheral edge of the fixing stud hole. A small ejector rod is connected under the small top block, and the small ejector rod is connected to the upper top plate. A stud hole core rod is installed in the concave-convex assembly top block, and the core rod cooperates with the inner hole wall of the fixing stud hole;

[0009] A push tube is connected to the lower top plate, and a thimble is connected to the bottom plate. The thimble passes through the push tube and cooperates with the inner hole wall of the positioning post hole. The concave-convex assembly top block surrounds the outer wall periphery of the positioning post hole.

[0010] The present invention discloses a zero-gap top block mechanism for an injection mold of an automobile door panel trim. A first mold opening fixed-distance hook and a second mold opening fixed-distance hook are provided on the outer wall of the mold. (The fixed-distance hook is a standard part of the mold parts, which is prior art, available on the market, or can be processed by oneself.)

[0011] The first mold opening fixed-distance hook is connected between the lower top plate and the fixed mold plate, and the second mold opening fixed-distance hook is connected between the upper top plate and the fixed mold plate. During mold opening, the moving mold plate and the fixed mold plate are separated by power. Under the action of the first mold opening fixed-distance hook, the lower top plate, the middle top plate and the upper top plate are pulled upward together, so that the lower top plate drives the concave-convex straight ejector rod and the boundary straight ejector rod, the middle top plate drives the undercut inclined ejector rod through the inclined sliding seat, the lower top plate drives the push tube, the concave-convex straight ejector rod drives the concave-convex assembly top block to vertically push up, the boundary straight ejector rod drives the boundary top block to vertically push up, the undercut inclined ejector rod drives the undercut top block to obliquely push up, and the push tube abuts against the bottom of the positioning post hole. At the same time, the upper top plate drives the small ejector rod, and the small ejector rod drives the small top block to vertically push up. During this process, the product is ejected from the moving mold plate. At the same time, the undercut top block obliquely pushes up and disengages from the inner side edge of the boundary undercut. After the mold is opened a certain distance, the first mold opening fixed-distance hook disengages from the lower top plate and the middle top plate, and the mold continues to open. At this time, the lower top plate and the middle top plate do not move, and the concave-convex assembly part, the boundary undercut and the positioning post hole are disengaged. However, the second mold opening fixed-distance hook drives the small ejector rod and the small top block on the upper top plate to continue to push up, and completely ejects the product from the mold. At this time, the product is taken out of the mold by manual or manipulator. During the taking-out process, the fixed column hole is disengaged from the small top block, and the product demolding is completed. For the zero-gap top block mechanism of this solution, each top block is designed compactly and ingeniously, with seamless cooperation, realizing zero-gap assembly, making the quality of the injection-molded product good and the grade high. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a schematic structural diagram of an injection mold for an automobile door panel trim of the present invention;

[0013] Figure 2 is a partially enlarged schematic diagram of the product of the present invention;

[0014] Figure 3 is a schematic diagram of the separated state of the product and each top block of the present invention;

[0015] Figure 4 is a schematic diagram of the assembly relationship of the boundary undercut, the undercut inclined ejector rod and the inclined sliding seat of the present invention;

[0016] Figure 5It is a schematic diagram of the assembly relationship of the small top block, small ejector rod and concave-convex assembly top block of the present invention;

[0017] Figure 6 It is a schematic diagram of the assembly relationship between the ejector tube and the ejector pin of the present invention. Specific embodiments

[0018] The present invention relates to a zero-step top block mechanism for an injection mold of an automobile door panel trim part, as Figure 1 — Figure 6 shown, including a fixed mold composite plate 1 and a moving mold composite plate 2 of the mold. A fixed mold plate 3 is installed under the fixed mold composite plate, a runner frame 4 is installed on the moving mold composite plate, a runner plate 5 is arranged in the runner frame, a bottom plate 6 is installed on the runner frame, a mold foot 7 is installed on the bottom plate, a moving mold plate 8 is installed on the mold foot. A mold cavity is arranged between the moving mold plate 8 and the fixed mold plate 3. There is an injection-molded product 9 in the mold cavity. The product is provided with a concave-convex assembly part 91, a boundary undercut 92, a fixing post hole 93 and a positioning post hole 94. A lower top plate 10, a middle top plate 11 and an upper top plate 12 are arranged between the mold feet 7. Concave-convex assembly top blocks 15, boundary top blocks 16 and undercut top blocks 17 corresponding to the concave-convex assembly part 91 and the boundary undercut 92 are arranged on the moving mold plate 8. The concave-convex assembly top block 15 is matched with the concave-convex assembly part 91. The concave-convex assembly top block 15 is connected to a concave-convex straight ejector rod 20 below, and the concave-convex straight ejector rod 20 is connected to the lower top plate 10. The boundary top block 16 is matched with the outer side edge of the boundary undercut 92. The boundary top block 16 is connected to a boundary straight ejector rod 25 below, and the boundary straight ejector rod 25 is connected to the lower top plate 10. The undercut top block 17 is located below the concave-convex assembly top block 15. The undercut top block 17 is matched with the inner side edge of the boundary undercut 92. The boundary undercut 92 is connected to an undercut inclined ejector rod 28. An inclined sliding seat 29 is arranged in the middle top plate 11, and the undercut inclined ejector rod 28 is connected to the inclined sliding seat 29. A small top block 30 is arranged in the concave-convex assembly top block 15. The head of the small top block 30 extends out of the concave-convex assembly top block 15 and is matched with the outer peripheral wall of the fixing post hole 93. The small top block is connected to a small ejector rod 31 below, and the small ejector rod is connected to the upper top plate 12. A post hole core rod 33 is installed in the concave-convex assembly top block 15, and the core rod 33 is matched with the inner hole wall of the fixing post hole 93. The lower top plate 10 is connected to an ejector tube 35, and the bottom plate 6 is connected to an ejector pin 36. The ejector pin 36 passes through the ejector tube 35 and is matched with the inner hole wall of the positioning post hole 94. The concave-convex assembly top block 15 surrounds the outer peripheral wall of the positioning post hole 94.

[0019] On the outer wall of the mold, there are a first mold opening fixed-distance hook and a second mold opening fixed-distance hook. (The fixed-distance hook is a standard part of the mold components, which is prior art, available on the market, or can be processed by oneself.) The first mold opening fixed-distance hook is connected between the lower top plate 10 and the fixed mold plate 3, and the second mold opening fixed-distance hook is connected between the upper top plate 12 and the fixed mold plate 3. When the mold is opened, the moving mold plate 8 and the fixed mold plate 3 are separated by power. Under the action of the first mold opening fixed-distance hook, the lower top plate 10, the middle top plate 11, and the upper top plate 12 are pulled upward together, so that the lower top plate 10 drives the concave-convex straight ejector rod 20 and the boundary straight ejector rod 25, the middle top plate 11 drives the undercut inclined ejector rod 28 through the inclined slide block 29, the lower top plate 10 drives the push tube 35, the concave-convex straight ejector rod 20 drives the concave-convex assembly ejector block 15 to vertically eject upward, the boundary straight ejector rod 25 drives the boundary ejector block 16 to vertically eject upward, the undercut inclined ejector rod 28 drives the undercut ejector block 17 to eject obliquely upward, and the push tube 35 abuts against the bottom of the positioning column hole 94. At the same time, the upper top plate 12 drives the small ejector rod 31, and the small ejector rod 31 drives the small ejector block 30 to vertically eject upward. During this process, the product 9 is ejected from the moving mold plate 8. At the same time, the undercut ejector block 17 ejects obliquely upward and disengages from the inner side edge of the boundary undercut 92. After the mold is opened a certain distance, the first mold opening fixed-distance hook disengages from the lower top plate 10 and the middle top plate 11, and the mold continues to open. At this time, the lower top plate 10 and the middle top plate 11 remain stationary, and the concave-convex assembly part 91, the boundary undercut 92, and the positioning column hole 94 are disengaged. However, the second mold opening fixed-distance hook drives the small ejector rod 31 and the small ejector block 30 on the upper top plate 12 to continue to eject upward, and completely ejects the product 9 from the mold. At this time, the product 9 is taken out of the mold by manual or mechanical means. During the taking-out process, the fixing column hole 93 is disengaged from the small ejector block 30, and the product demolding is completed. In the zero-step difference ejector block mechanism of this solution, each ejector block is designed compactly and ingeniously, with seamless cooperation, realizing zero-step difference assembly, making the quality of the injection-molded product good and the grade high.

Claims

1. Zero-gap ejector mechanism for injection mold of automobile door panel trim, comprising a fixed mold clamping plate (1) and a movable mold clamping plate (2). A fixed mold plate (3) is installed under the fixed mold clamping plate, a runner support (4) is installed on the movable mold clamping plate, a runner plate (5) is arranged in the runner support, a bottom plate (6) is installed on the runner support, a mold foot (7) is installed on the bottom plate, a movable mold plate (8) is installed on the mold foot. A mold cavity is arranged between the movable mold plate (8) and the fixed mold plate (3), and a product (9) formed by injection molding is in the mold cavity. The product is provided with concave-convex assembly parts (91), boundary undercuts (92), fixing column holes (93) and positioning column holes (94). A lower top plate (10), a middle top plate (11) and an upper top plate (12) are arranged between the mold feet (7), and the characteristics are that An uneven assembly top block (15), a boundary top block (16) and an undercut top block (17) corresponding to the uneven assembly part (91) and the boundary undercut (92) are arranged on the moving template (8); The uneven assembly top block (15) is matched with the uneven assembly part (91). An uneven straight ejector rod (20) is connected under the uneven assembly top block (15), and the uneven straight ejector rod (20) is connected to the lower top plate (10); The boundary top block (16) is matched with the outer side of the boundary undercut (92). A boundary straight ejector rod (25) is connected under the boundary top block (16), and the boundary straight ejector rod (25) is connected to the lower top plate (10); The undercut top block (17) is located below the uneven assembly top block (15). The undercut top block (17) is matched with the inner side of the boundary undercut (92). An undercut inclined ejector rod (28) is connected under the boundary undercut (92). An inclined sliding seat (29) is arranged in the middle top plate (11), and the undercut inclined ejector rod (28) is connected to the inclined sliding seat (29); A small top block (30) is arranged in the uneven assembly top block (15). The head of the small top block (30) extends out of the uneven assembly top block (15) and is matched with the outer peripheral wall of the fixed column hole (93). A small ejector rod (31) is connected under the small top block, and the small ejector rod is connected to the upper top plate (12). A column hole core rod (33) is installed in the uneven assembly top block (15), and the core rod (33) is matched with the inner hole wall of the fixed column hole (93); A push tube (35) is connected to the lower top plate (10), and a ejector pin (36) is connected to the bottom plate (6). The ejector pin (36) passes through the push tube (35) and is matched with the inner hole wall of the positioning column hole (94). The uneven assembly top block (15) surrounds the outer peripheral wall of the positioning column hole (94); On the outer wall of the mold, there are also a first mold opening distance-determining hook and a second mold opening distance-determining hook. The first mold opening distance-determining hook is connected between the lower top plate (10) and the fixed mold plate (3), and the second mold opening distance-determining hook is connected between the upper top plate (12) and the fixed mold plate (3). During mold opening, the moving mold plate (8) and the fixed mold plate (3) are separated by power. Under the action of the first mold opening distance-determining hook, the lower top plate (10), the middle top plate (11), and the upper top plate (12) are pulled upward together, so that the lower top plate (10) drives the concave-convex straight ejector rod (20) and the boundary straight ejector rod (25), the middle top plate (11) drives the undercut inclined ejector rod (28) through the inclined sliding seat (29), the lower top plate (10) drives the push tube (35), the concave-convex straight ejector rod (20) drives the concave-convex assembly ejector block (15) to vertically eject upward, the boundary straight ejector rod (25) drives the boundary ejector block (16) to vertically eject upward, the undercut inclined ejector rod (28) drives the undercut ejector block (17) to eject obliquely upward, and the push tube (35) abuts against the bottom of the positioning column hole (94). At the same time, the upper top plate (12) drives the small ejector rod (31), and the small ejector rod (31) drives the small ejector block (30) to vertically eject upward. During this process, the product (9) is ejected from the moving mold plate (8). At the same time, the undercut ejector block (17) ejects obliquely upward and disengages from the inner side edge of the boundary undercut (92). After the mold is opened a certain distance, the first mold opening distance-determining hook disengages from the lower top plate (10) and the middle top plate (11), and the mold continues to open. At this time, the lower top plate (10) and the middle top plate (11) do not move, and the concave-convex assembly part (91), the boundary undercut (92), and the positioning column hole (94) are disengaged. However, the second mold opening distance-determining hook drives the small ejector rod (31) and the small ejector block (30) on the upper top plate (12) to continue to eject upward, and completely ejects the product (9) from the mold. At this time, the product (9) is taken out of the mold by manual or mechanical means. During the taking-out process, the fixing column hole (93) is disengaged from the small ejector block (30), and the product demolding is completed.

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