A mold improvement structure for reducing injection defects of composite suede
By setting a pre-tightening component on the top of the mold core, the problems of wrinkles and punctures caused by poor positioning in the injection molding of composite suede were solved, achieving efficient product positioning and molding and reducing production costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NANJING GSK NANJO AUTO PARTS CO LTD
- Filing Date
- 2025-07-04
- Publication Date
- 2026-07-17
AI Technical Summary
The lack of effective pre-tightening positioning during the injection molding process of composite suede, especially at complex curved surfaces such as R-angles, leads to wrinkles and punctures on the product's surface, resulting in low yield and double waste of materials and suede, increasing production costs.
A pre-tightening component, including a spring block, a pin, a tension spring, and a spring, is set on the top of the mold core. The adaptive pre-tightening force of the spring block during the mold closing process positions the edges and corners of the composite suede, ensuring that it remains flat in easily deformable areas such as the R-corner. Combined with the guide hole and ejection component, precise positioning and uniform ejection are achieved.
This effectively avoids wrinkles and punctures in composite suede injection molding, improves product yield, reduces material waste, and lowers production costs.
Smart Images
Figure CN224510261U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of injection molds, specifically to an improved mold structure for reducing defects in composite suede injection molding. Background Technology
[0002] Composite suede injection mold is a special mold used to combine composite suede with a plastic substrate. The mold achieves precise positioning and molding of the composite suede during the injection molding process through the cooperation structure of the front mold and the rear mold.
[0003] Currently, the commonly used injection molding process for composite suede typically involves hanging the composite suede on the hanging pins of the front mold for low-pressure injection molding. This traditional method has significant drawbacks: due to the lack of effective pre-tightening and positioning of the composite suede during mold closing, especially at complex curved surfaces such as radius corners, the appearance of the molded product is prone to quality problems such as wrinkles and punctures. These problems not only lead to low yield rates but also result in a double waste of composite suede and plastic materials, significantly increasing production costs. Furthermore, repeated defect repairs and material losses further exacerbate the double waste of materials and suede. Therefore, an improved mold structure to reduce defects in composite suede injection molding is proposed. Utility Model Content
[0004] The purpose of this utility model is to provide an improved mold structure to reduce defects in composite suede injection molding, thereby solving the quality problems mentioned in the background art. Due to the lack of effective pre-tightening positioning of composite suede during the mold closing process, especially in complex curved surfaces such as R-angles, the appearance of the product after injection molding is prone to wrinkles and punctures. These problems not only lead to low yield, but also cause double waste of composite suede and plastic materials, significantly increasing production costs. At the same time, repeated defect repairs and material losses further exacerbate the problem of double waste of materials and suede.
[0005] To achieve the above objectives, this utility model provides the following technical solution: an improved mold structure for reducing defects in composite suede injection molding, comprising a front mold and a rear mold, wherein two cores are fixedly connected to the upper surface of the rear mold, a pre-tightening assembly is provided on the top of the cores, and an ejection assembly is provided inside the rear mold;
[0006] The pre-tightening assembly includes a spring block with two through holes at its top. A pin is movably inserted into the through holes. A groove is formed at the top of the core. The bottom end of the pin movably passes through the through hole and is fixedly connected to the inner bottom wall of the groove. A tension spring is movably sleeved on the upper part of the pin, and a spring is movably sleeved on the lower part of the pin. An annular limiting block is movably sleeved on the outer side of the pin. The outer side of the annular limiting block is fixedly connected to the inner side wall of the through hole. The annular limiting block is located between the tension spring and the spring. The tension spring is located inside the through hole, and the lower part of the spring passes through the through hole and is inserted into the groove.
[0007] Preferably, the lower surface of the aforementioned front mold has two cavities that are adapted to the core, and the core is R-shaped.
[0008] Preferably, a plurality of fabric hanging needles are fixedly connected to the lower surface of the aforementioned front mold, and the fabric hanging needles are distributed along the outer shape of the core.
[0009] Preferably, the aforementioned spring block is movably inserted into the interior of the groove, and the upper part of the spring block is provided with a conical contact surface.
[0010] Preferably, the outer sides of the aforementioned front mold and rear mold are respectively provided with a first guide hole and a second guide hole, and the first guide hole and the second guide hole are of the same size.
[0011] Preferably, the ejection assembly described above includes a contact plate and a plurality of ejector pins. The contact plate is fixedly embedded in the top of the rear mold, and the top of the contact plate has a plurality of ejection holes adapted to the ejector pins.
[0012] Preferably, one end of the ejector pin is movably inserted into the ejector hole, and a plurality of ejector pins are evenly distributed along the outer shape of the core.
[0013] Compared with the prior art, the present invention, by adopting the above technical solution, has the following technical effects:
[0014] This invention solves the problems of wrinkles and punctures caused by unstable suede positioning in traditional injection molding processes by setting a pre-tightening component on the top of the rear mold core. During mold closing, a spring block adaptively pre-tightens the edges and corners of the composite suede. Through the synergistic action of a tension spring and a spring, the spring block applies a uniform pre-tightening force to the suede in the early stages of mold closing, keeping it flat in easily deformable areas such as the radius (R-angle). This invention significantly improves the yield of composite suede injection-molded products, avoids double waste of materials and suede, and reduces production costs. Attached Figure Description
[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0016] Figure 1 This is a schematic diagram of the partial cross-sectional structure of the spring block of this utility model;
[0017] Figure 2 This is a partial cross-sectional view of the spring block of this utility model from another perspective;
[0018] Figure 3This is a schematic diagram of the spring block structure of this utility model;
[0019] Figure 4 This is a schematic diagram of the spring block structure from another perspective of the present invention;
[0020] Figure 5 This is a schematic diagram of the rear mold structure of this utility model;
[0021] Figure 6 This is a schematic diagram of the rear mold structure from another perspective of the present invention;
[0022] Figure 7 This is a schematic diagram of the front mold structure of this utility model;
[0023] Figure 8 This is a schematic diagram of the front mold of this utility model from another perspective.
[0024] Explanation of reference numerals in the attached drawings: 1. Front mold; 2. Rear mold; 3. Cavity; 4. Core; 5. First guide hole; 6. Second guide hole; 7. Ejector assembly; 71. Contact plate; 72. Ejector pin; 73. Ejector hole; 8. Preload assembly; 81. Spring block; 82. Pin; 83. Through hole; 84. Conical contact surface; 85. Annular limit block; 86. Tension spring; 87. Spring; 9. Fabric hanging pin; 10. Groove. Detailed Implementation
[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0026] It should be noted that the structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size should still fall within the scope of the technical content disclosed in this application, provided that they do not affect the effects and purposes that this application can produce.
[0027] Example
[0028] In the existing technology, due to the lack of effective pre-tightening positioning of composite suede during the mold closing process, especially in complex curved surfaces such as R-angles, the appearance of the product after injection molding is prone to quality problems such as wrinkles and punctures. These problems not only lead to low yield, but also cause double waste of composite suede and plastic materials, significantly increasing production costs. At the same time, repeated defect repairs and material losses further increase the double waste of materials and suede.
[0029] Please see Figure 1-8 This utility model provides a technical solution: an improved mold structure for reducing defects in injection molding of composite suede, comprising a front mold 1 and a rear mold 2. Two cores 4 are fixedly connected to the upper surface of the rear mold 2. Two cavities 3, adapted to the cores 4, are formed on the lower surface of the front mold 1. The cores 4 are R-shaped. When the front mold 1 and rear mold 2 are closed, the cores 4 are embedded in the cavities 3. A plurality of fabric-hanging needles 9 are fixedly connected to the lower surface of the front mold 1. The fabric-hanging needles 9 are distributed along the outer shape of the cores 4 to hold the composite suede to be processed. The leather is hung below the front mold 1 by the hanging pin 9. The front mold 1 moves towards the rear mold 2, causing the composite suede to close. The top of the core 4 is provided with a pre-tightening component 8, and the interior of the rear mold 2 is provided with an ejection component 7. The outer sides of the front mold 1 and the rear mold 2 are respectively provided with a first guide hole 5 and a second guide hole 6. The first guide hole 5 and the second guide hole 6 are the same size. Before closing the mold, a guide rod is movably inserted between the second guide hole 6 and the first guide hole 5. The front mold 1 closes the mold along the direction of the guide rod, which is more precise.
[0030] The ejection assembly 7 includes a contact plate 71 and several ejector pins 72. The contact plate 71 is fixedly embedded in the top of the rear mold 2. The top of the contact plate 71 has several ejection holes 73 that are adapted to the ejector pins 72. The gap between the ejector pins 72 and the ejection holes 73 is ≤0.02mm to avoid jamming during ejection. When the mold is opened, the ejector pins 72 eject the formed composite suede. One end of the ejector pin 72 is movably inserted into the interior of the ejection hole 73. When the mold is not opened, the ejector pins 72 are inside the ejection hole 73. Several ejector pins 72 are evenly distributed along the outer shape of the core 4, and the force of the ejector pins 72 ejecting the composite suede is more uniform.
[0031] The pre-tightening assembly 8 includes a spring block 81. Two through holes 83 are formed on the top of the spring block 81. A pin 82 is movably inserted into the through holes 83. A groove 10 is formed on the top of the core 4. The bottom end of the pin 82 movably passes through the through holes 83 and is fixedly connected to the inner bottom wall of the groove 10. The spring block 81 is movably inserted into the groove 10. A conical contact surface 84 is provided on the upper part of the spring block 81. When the front mold 1 closes, the composite suede hanging on the hanging needle 9 moves downward along the conical contact surface 84. The spring block 81 temporarily pre-tightens and fixes the edges and corners of the composite suede. The upper part of the pin 82 is movable. A tension spring 86 is sleeved on the pin 82, and a spring 87 is movably sleeved on the lower part of the pin 82. An annular limiting block 85 is movably sleeved on the outer side of the pin 82. The outer side of the annular limiting block 85 is fixedly connected to the inner sidewall of the through hole 83. The annular limiting block 85 is located between the tension spring 86 and the spring 87. The tension spring 86 is located inside the through hole 83. The lower part of the spring 87 passes through the through hole 83 and is inserted into the groove 10. The tension spring 86 is fixed between the top of the pin 82 and the upper end of the through hole 83 to ensure tension reset. The spring 87 is fixed between the annular limiting block 85 and the bottom of the groove 10 to provide upward elastic force.
[0032] The working principle or structural principle is as follows: Before mold closing, the composite suede to be injection molded is fixed below the front mold 1 along multiple hanging pins 9. The composite suede hangs on the hanging pins 9 and completely covers the cavity 3. The cavity 3 and the core 4 are R-shaped. At the easily wrinkled part of the R, the spring block 81 of the pre-tightening component 8 protrudes. The spring block 81 moves up and down in the groove 10 and is pushed up by the spring 87. The guide rod passes through the first guide hole 5 of the front mold 1 and the second guide hole 6 of the rear mold 2. The front mold 1 moves with the composite suede towards the rear mold 2. When the composite suede contacts the core 4, the core 4 is molded into the cavity 3. Before the core 4 reaches the surface, it first contacts the spring block 81. With the clamping of the front mold 1, the tension spring 86 is stretched and the spring 87 is compressed, causing the spring block 81 to contact the composite suede surface. The spring 87 pushes the spring block 81 upwards to press against the composite suede, pre-pressing and positioning the edges and corners of the composite suede. The front mold 1 and rear mold 2 close, and the core 4 is embedded in the cavity 3. The composite suede is then injection molded under low pressure. After mold closing, the composite suede is completely compressed and straightened into a fixed state. The hanging needles 9 are evenly distributed, with an appropriate number of hanging needles 9 arranged in the easily wrinkled R-corner positions within the cavity 3 to stretch the composite suede. After mold closing, after a period of cooling, the molded composite suede product is ejected from the core 4 through the ejector pins 72 along the ejector holes 73. After the spring block 81 loses the pressure of the front mold 1, the stretched tension spring 86 and the compressed spring 87 move the spring block 81 upwards to reset.
[0033] In summary, before mold closing, the composite suede is laid flat over a large area on the hanging needle 9. The front mold 1 moves the composite suede towards the rear mold 2. Before the composite suede contacts the surface of the core 4, it contacts the spring block 81. The spring block 81, under the action of the spring 87 and the compression of the front mold 1, pre-presses and positions the edges and corners of the composite suede. The front mold 1 and rear mold 2 close, the core 4 is embedded in the cavity 3, and the composite suede is injection molded under low pressure. After mold closing, the composite suede is completely compressed and straightened into a fixed state. Because the spring block 81 pre-presses and positions the composite suede, problems such as wrinkles and punctures in easily wrinkled areas of the molded composite suede product are avoided. The elasticity of the spring 87 and tension spring 86 needs to be checked regularly to avoid fatigue failure.
[0034] Those skilled in the art will understand that the features described in the various embodiments and / or claims of this utility model can be combined or combined in various ways, even if such combinations or combinations are not explicitly described in this utility model. In particular, the features described in the various embodiments and / or claims of this utility model can be combined or combined in various ways without departing from the spirit and teachings of this utility model. All such combinations and / or combinations fall within the scope of this utility model.
Claims
1. A mold improvement structure for reducing injection molding defects of a composite suede, comprising a front mold (1) and a back mold (2), characterized in that: The upper surface of the rear mold (2) is fixedly connected to two cores (4), the top of the cores (4) is provided with a pre-tightening component (8), and the interior of the rear mold (2) is provided with an ejection component (7); The pre-tightening assembly (8) includes a spring block (81), the top of which has two through holes (83). A pin (82) is movably inserted into the through holes (83). The top of the core (4) has a groove (10). The bottom end of the pin (82) movably passes through the through holes (83) and is fixedly connected to the inner bottom wall of the groove (10). A tension spring (86) is movably sleeved on the upper part of the pin (82). A spring (87) is movably sleeved on the lower part of the pin (82), and an annular limiting block (85) is movably sleeved on the outer side of the pin (82). The outer side of the annular limiting block (85) is fixedly connected to the inner sidewall of the through hole (83). The annular limiting block (85) is located between the tension spring (86) and the spring (87). The tension spring (86) is located in the through hole (83). The lower part of the spring (87) passes through the through hole (83) and is inserted into the groove (10).
2. The mold improvement structure for reducing the injection defect of the composite suede according to claim 1, characterized in that: The lower surface of the front mold (1) has two cavities (3) that are adapted to the core (4), and the core (4) is R-shaped.
3. The mold improvement structure for reducing the injection defect of the composite suede according to claim 1, characterized in that: A number of fabric hanging needles (9) are fixedly connected to the lower surface of the front mold (1), and the fabric hanging needles (9) are distributed along the outer shape of the core (4).
4. The mold improvement structure for reducing the injection defect of the composite suede according to claim 1, characterized in that: The spring block (81) is movably inserted into the interior of the groove (10), and the upper part of the spring block (81) is provided with a conical contact surface (84).
5. The mold improvement structure for reducing the injection defect of the composite suede according to claim 1, characterized in that: The front mold (1) and the rear mold (2) are respectively provided with a first guide hole (5) and a second guide hole (6) on their outer sides, and the first guide hole (5) and the second guide hole (6) are the same size.
6. The improved mold structure for reducing defects in composite suede injection molding according to claim 1, characterized in that: The ejection assembly (7) includes a contact plate (71) and a plurality of ejector pins (72). The contact plate (71) is fixedly embedded in the top of the rear mold (2). The top of the contact plate (71) is provided with a plurality of ejection holes (73) that are adapted to the ejector pins (72).
7. The mold improvement structure for reducing the injection molding defects of the composite suede according to claim 6, characterized in that: One end of the ejector pin (72) is movably inserted into the interior of the ejector hole (73), and several ejector pins (72) are evenly distributed along the outer shape of the core (4).