Two-color mold
By adopting a swappable rear mold and lever assembly structure in the two-color mold, the problem of poor adaptability of traditional molds is solved, and flexible adjustment of the mold structure and increased production speed are achieved.
Patent Information
- Application Number
- CN202510952431.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-10
- Publication Date
- 2025-09-26
AI Technical Summary
The consistency of the fixed and movable mold cavities of traditional two-shot molds limits the flexibility of the mold, making it difficult to adapt to complex process requirements and changes in product appearance.
Two left and right molds are used, each mold consists of a front mold and a rear mold. The rear mold has the same structure but can be swapped. It is equipped with a lever assembly and guide pins. By coordinating the different positions of the lever assembly and guide pins, the mold structure can be flexibly adjusted to adapt to different shapes and process requirements.
It improves the flexibility of mold design for the production of two-color overmolding products, increases production speed, realizes the synchronous conversion of mold action and cavity function, and reduces the need to change molds.
Smart Images
Figure CN120697256A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of plastic production and processing, in particular to a two-color mold. Background Art
[0002] Two-shot injection molding is widely used in the production of plastic products, achieving two- or multi-color effects through two injection molding cycles. Current technology primarily achieves this by placing the second shot on the fixed side of the mold, a design that has become the mainstream solution in the industry. However, as product appearance requirements become increasingly complex, the demands for flexibility and precision in two-shot molding continue to increase, and the structural limitations of traditional two-shot molds are becoming increasingly apparent.
[0003] Traditional two-color molds often employ a completely symmetrical design for the fixed and movable molds. This design makes the mold relatively inflexible, especially when the product's appearance or functional requirements change. Due to the consistency of the fixed and movable mold cavities, the injection and molding process of the two-color rubber compound often cannot adapt to certain process requirements, thus limiting the application of two-color overmolded products across different production batches and the flexibility of mold adjustments. Summary of the Invention
[0004] In response to the shortcomings of the existing technology, the present invention provides a two-color mold to solve the problem that existing two-color molds require the cavity size and shape of the fixed mold and the movable mold to be completely consistent. This makes it impossible to flexibly adjust the mold design according to actual needs when facing different shapes or complex process requirements, thereby limiting the diversity of products.
[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: A two-color mold comprises two left and right molds, each mold is provided with a front mold and a rear mold, and the two rear molds are both located above the two front molds, the two-color mold comprises a first rear mold part, a first front mold part, a second rear mold part and a second front mold part, characterized in that: the first rear mold part and the second rear mold part have the same structure and can be swapped, a lever assembly is provided inside the first rear mold part, the bottom end surface of the first rear mold part is embedded with a plurality of guide pins, the guide pins can move up and down in the rear mold part and the bottom ends of the guide pins can extend to the bottom end surface of the first rear mold part, the bottom end surfaces of the left and right ends of the lever assembly are both provided with guide pins in contact with the lever assembly, a groove is provided on the front mold at the position of the guide pin on one side of the lever assembly, when the front mold and the rear mold are buckled, the lever assembly is in a state where one side is tilted and the other side is sunken due to the existence of the groove on the front mold, and the states of the lever assemblies of the left and right molds are different.
[0006] Preferably, the lever assembly includes a support block and a lever, one end of the support block is fixed in the rear mold, and the other end of the support block is hinged to the lever.
[0007] Preferably, the lever assemblies are all arranged at the edge of the rear mold, and a second ejector plate is slidably arranged in the central area of the rear mold along the vertical direction. The guide pin contacted by one end of each lever assembly close to the central area of the rear mold has an end fixedly connected to the second ejector plate, and a plurality of ejector bodies are fixedly connected to the bottom end surface of the second ejector plate. A blanking assembly is provided on the ejector body on each rear mold.
[0008] Preferably, the lever assemblies in the first rear mold part are respectively arranged on the left and right sides of the rear mold, the guide pin contacted by the end of the lever assembly close to the edge of the rear mold is the second guide pin, and the guide pin contacted by the end of the lever assembly close to the central area inside the rear mold is the first guide pin, and the top end of the first guide pin is fixedly connected to the second ejector plate.
[0009] Preferably, a cushion block is sleeved on the end of the first guide pin, and the first guide pin is mounted on the second ejector plate through the cushion block.
[0010] Preferably, a roller is installed on the end of the lever assembly that contacts the first guide pin, and the lever assembly contacts the cushion block through the roller.
[0011] Preferably, the blanking assembly includes a first ejector plate, a first ejector back plate, and a through needle, the top end of the through needle is embedded between the first ejector plate and the first ejector back plate, the first ejector plate is fixed to the bottom end surface of the first ejector back plate, a driving source for driving the first ejector back plate to move up and down is provided above the first ejector back plate, the output end of the driving source is fixedly connected to the first ejector back plate, the through needle penetrates the first ejector plate, the second ejector plate, and the ejector body from top to bottom in the length direction, the bottom end surface of the ejector body serves as the top end surface of the inner cavity of the injection molded part cavity, and the bottom end of the through needle can extend into the cavity of the injection molded part.
[0012] Preferably, the bottom end of the rear mold is the female mold plate, the top end of the front mold is the male mold plate, the top end of the first front mold part is the first male mold plate, and the area of the guide pin on the first male mold plate corresponding to the edge of the rear mold end face is provided with a groove; the top end of the second front mold part is the second male mold plate, and the area of the guide pin on the second male mold plate corresponding to the central area of the rear mold end face is provided with a groove.
[0013] Working principle: First, the two-color mold has two sets of molds, which are divided into two front molds and two rear molds. The positions of the first guide pin or the second guide pin on the male mold plates on the two front molds are different. The first front mold part is hollow, and the corresponding area of the second front mold part is solid. The structures of the two rear molds are the same. When the front and rear molds are buckled, hollow or solid will affect the state of the lever assembly, so that the first rear membrane part and the second rear membrane part have the same structure, but the internal shape is different. When one color is struck, the front and rear membranes are buckled, so that the shape of the lever assembly is changed according to the different groove positions, that is, when docking with different front molds, the shape of the lever assembly is different, that is, when docking with the first male mold plate, the top block is directly below the first guide pin, thereby pushing the lever body to let the second guide pin slide into the groove, allowing the first guide pin and the second ejector plate to rise, and when docking with the second male mold plate, the top block is located directly below the second guide pin, thereby driving the first guide pin and the second ejector plate to descend, from The effect of adjusting the size of the injection molding cavity during use is that the ejector body and other multiple nail pins are combined with the second male template to form multiple injection molding cavities for punching one color hard glue. Then, after the one color hard glue is cooled and shaped, the front and rear molds are opened. Usually, the two front molds are fixed in position, and the two rear molds are fixed on the turntable. The turntable rotates 180° and then the positions of the two rear molds are swapped. When punching two colors, the rear mold with one color hard glue is buckled with the other front mold. After buckling, the first male template pushes up the first guide pin and the second guide pin drops. The pushing of the first guide pin will cause the first ejector body, the second ejector body, the second ejector plate, the one color glue, etc. to move upward. The end face of the first male template is combined with the first ejector body and the one color glue to form an injection molding cavity for the two color glue. The injection channels are all set on the front mold. The two-color injection molding is completed: the mold is opened. At this time, the first ejector back plate and the first ejector plate are driven down by the driving source, and the two-color product at the bottom of the rear mold is squeezed out by the downward movement of the through pin.
[0014] The present invention provides a two-color mold. It has the following beneficial effects: 1. The present invention makes up for the defect that the original two-color mold dual-color setting is limited to fixed film by having two inconsistent fixed mold cavities and two inconsistent movable mold cavities, thereby improving the flexibility of mold design for the production of two-color encapsulated products.
[0015] 2. The present invention uses a lever structure to change the structure of the movable mold after the two colors are buckled together. That is, when injecting one color and two colors, the state of the lever is maintained in two different situations, and the fixed film also adopts two shapes, thereby increasing the production speed during use, and there is no need to replace the mold after producing one product.
[0016] 3. The present invention utilizes the structural differences between the front and rear molds in conjunction with a rotating turntable so that the guide pins are aligned with the solid or through-hole areas on the male mold plate after rotation, thereby achieving automatic switching of the cavity state while the mold rotates, thereby achieving the effect of synchronous conversion of the mold action and cavity function during the two-color injection molding process. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 is a partial cross-sectional view of the first rear film of the present invention; Figure 2 It is a partial schematic diagram of the first front mold part of the present invention; Figure 3 is a partial cross-sectional schematic diagram of the second front mold of the present invention; Figure 4 It is a partial schematic diagram of the second rear mold portion of the present invention; Figure 5 It is a partial schematic diagram of the support block of the present invention; Figure 6 This is a double-mode closed display diagram of the present invention; Figure 7 This is a diagram showing the dual-mode opening and closing of the present invention; Figure 8 Schematic diagram of the product of the present invention, A, the outer soft glue, and B, the inner skeleton.
[0018] Among them, 1. the first rear mold part; 2. the first front mold part; 3. the first ejector back plate; 4. the first ejector plate; 5. the lever body; 6. the second ejector plate; 7. the first guide pin; 8. the second guide pin; 9. the first female mold plate; 10. the first ejector body; 11. the second ejector body; 12. the first male mold plate; 13. the second rear mold part; 14. the second front mold part; 24. the second male mold plate; 25. the spacer; 26. the roller; 27. the first pin; 28. the second pin; 29. the support block. DETAILED DESCRIPTION
[0019] The following will clearly and completely describe the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0020] Please see the attached Figure 1 -Attached Figure 8, an embodiment of the present invention provides a two-color mold, including two left and right molds, each mold is provided with a front mold and a rear mold, and the two rear molds are located above the two front molds, the two-color mold includes a first rear mold part 1, a first front mold part 2, a second rear mold part 13 and a second front mold part 14, characterized in that: the first rear mold part 1 and the second rear mold part 13 have the same structure and can be swapped, a lever assembly is provided inside the first rear mold part 1, and a plurality of guide pins are embedded in the bottom end surface of the first rear mold part 1, the guide pins can move up and down in the rear mold part and the bottom ends of the guide pins can extend to the bottom end surface of the first rear mold part 1, the bottom end surfaces of the left and right ends of the lever assembly are provided with guide pins in contact with the lever assembly, and a groove is provided on the front mold at the position of the guide pin on one side of the lever assembly. When the front mold and the rear mold are buckled together, the lever assembly is in a state where one side is tilted and the other side is sunken due to the existence of the groove on the front mold, and the states of the lever assemblies of the left and right molds are different. The lever assembly includes a support block 29 and a lever. One end of the support block 29 is fixed in the rear mold, and the other end of the support block 29 is hinged to the lever.
[0021] Specifically, first, the mold is divided into two molds, a total of four parts including the first rear mold part 1 and the second rear mold part 13 as the rear mold, the rear mold structure is the same, and the first front mold part 2 and the second front mold part 14 are the front mold, the upper side of the front mold is provided with a groove, the groove position is different, the groove is used for the guide pin when punching Figure 8 The products A and B shown are used to control the deformation of the cavity. During use, by extending the guide pin outside the first rear mold part 1, when docking with the first front mold part 2 for coloring, the lifting lever assembly allows it to drive the second guide pin 8 to slide into the groove of the first male mold plate 12, so that the first guide pin 7 can adjust the position of the second ejector plate 6 when it moves. When the second ejector plate 6 is adjusted, it will drive the first ejector body 10 and the second ejector body 11 to move. Then, when the second ejector plate 6 moves, the individual cavity will change, thereby producing product B. During use, when docking with the second front mold part 14, the groove position of the second male mold plate 24 will change, allowing the first guide pin 7 to slide into the groove of the second male mold plate 24. During use, the second male mold plate 24 and the first male mold plate 12 have the same structure, but the groove position is different. Therefore, during use, it plays a role in controlling the lever assembly, so that during use, the cavity can be switched according to the first front mold part 2 and the second front mold part 14 when docking and coloring.
[0022] Please see the attached Figure 1 and Figure 5The lever assemblies are all arranged at the edge of the rear mold. A second ejector plate 6 is slidably arranged in the vertical direction in the central area of the rear mold. The guide pin contacted by one end of each lever assembly close to the central area of the rear mold is fixedly connected to the second ejector plate 6. The bottom end surface of the second ejector plate 6 is fixedly connected to a plurality of ejector bodies. A blanking assembly is provided on the ejector body on each rear mold.
[0023] Specifically, the second ejector plate 6 is controlled by the first guide pin 7 during use, and the lower side of the second ejector plate 6 is connected to the ejector body, which includes the first ejector body 10 and the second ejector body 11, and the bottom ends of the first ejector body 10 and the second ejector body 11 are connected to the inside of the cavity, and then when the first rear mold part 1 and the second rear mold part 13 and the first front mold part 2 and the second front mold part 14 are produced and colored during production, the second ejector plate 6 is driven to move through the control of the lever assembly to complete the process of use according to the different colors used to change the effect of the cavity.
[0024] Please see the attached Figure 1 and Figure 5 The lever assemblies in the first rear mold part 1 are respectively arranged on the left and right sides of the rear mold. The guide pin contacted by the end of the lever assembly close to the edge of the rear mold is the second guide pin 8, and the guide pin contacted by the end of the lever assembly close to the central area inside the rear mold is the first guide pin 7. The top end of the first guide pin 7 is fixedly connected to the second ejector plate 6.
[0025] Specifically, the lower end of the lever assembly, such as Figure 5 Shown in normal use Figure 5 For inverted use, it is installed on the left and right sides of the first rear mold part 1 and the second rear mold part 13, and the guide pin arranged on the lever body 5 near the edge of the first rear mold part 1 in the lever assembly is the second guide pin 8, and the first guide pin 7 is arranged near the central area. During use, the second ejector plate 6 drives the second ejector plate 6 to move by changing when the first guide pin 7 is displaced.
[0026] Please see the attached Figure 5 The end of the first guide pin 7 is sleeved with a pad 25, and the first guide pin 7 is mounted on the second ejector plate 6 through the pad 25. A roller 26 is installed on the end of the lever assembly that contacts the first guide pin 7, and the lever assembly contacts the pad 25 through the roller 26.
[0027] Specifically, the pad 25 is hinged to the second ejector plate 6. During use, when the first guide pin 7 or the second guide pin 8 slides into the groove and the other side is lifted by the ejector block, the lever body 5 moves. During use, the lever body 5 is hinged to the support block 29 through the second pin 28, and the lever body 5 moves with the second pin 28 as the central axis during movement, thereby controlling the deformation of the second ejector plate 6 during use. Secondly, the roller 26 is hinged to the lever body 5 with the first pin 27. During use, the movement of the roller 26 is axially moved with the first pin 27 as the axis, thereby preventing the lever body 5 from getting stuck when changing by using the first pin 27 as the axis.
[0028] Please see the attached Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 6 and Figure 7 The blanking component includes a first ejector plate 4, a first ejector back plate 3, and a penetrating needle. The top end of the penetrating needle is embedded between the first ejector plate 4 and the first ejector back plate 3. The first ejector plate 4 is fixed to the bottom end surface of the first ejector back plate 3. A driving source for driving the first ejector back plate 3 to move up and down is provided above the first ejector back plate 3. The output end of the driving source is fixedly connected to the first ejector back plate 3. The penetrating needle penetrates the first ejector plate 4, the second ejector plate 6, and the ejector body from top to bottom in the length direction. The bottom end surface of the ejector body serves as the top end surface of the inner cavity of the injection molded part cavity, and the bottom end of the penetrating needle can extend into the cavity of the injection molded part.
[0029] Specifically, the driving source of the blanking component includes a hydraulic cylinder, an electric push rod or an air cylinder, which is selected and used according to the actual scenario. The output end of the driving source passes through the top of the first rear mold part 1 and the second rear mold part 13 and is fixed on the first ejector back plate 3. When the driving source is started, the first ejector back plate 3 drives the first ejector plate 4 and the penetration needle to descend, and the descending penetration needle directly ejects the product, thereby completing the blanking operation during use. During use, the penetration needle also has a limiting effect on the second ejector plate 6, the first ejector body 10 and the second ejector body 11, thereby playing a guiding effect when blanking during use, and when the driving source retreats, the first ejector back plate 3 and the first ejector plate 4 retreat, and during use, Figure 1-4 as well as Figure 7 As shown, a connecting block is provided at the connection between the first ejector plate 4 and the first ejector back plate 3. Through this connecting block, the through-pin is embedded in the first ejector plate 4, thereby realizing the linkage effect of the first ejector back plate 3 and the first ejector plate 4 during use, thereby achieving the effect of rapid material removal during use.
[0030] Please see the attached Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 6 and Figure 7 The bottom end of the rear mold is the female mold plate, the top end of the front mold is the male mold plate, the top end of the first front mold part 2 is the first male mold plate 12, and the area of the guide pin on the first male mold plate 12 corresponding to the edge of the rear mold end face is provided with a groove; the top end of the second front mold part 14 is the second male mold plate 24, and the area of the guide pin on the second male mold plate 24 corresponding to the central area of the rear mold end face is provided with a groove.
[0031] Specifically, during use, the bottom end surfaces of the first rear mold portion 1 and the second rear mold portion 13 are both provided with a first female mold plate 9. The first female mold plate 9 serves to limit the first guide pin 7 and the second guide pin 8 during use. It not only serves to limit the first guide pin 7 and the second guide pin 8, but also prevents the first guide pin 7 and the second guide pin 8 from deviating from each other during swapping. The first male mold plate 12 and the second male mold plate 24 provided at the top ends of the first front mold portion 2 and the second front mold portion 14 also have the same structure, but are provided with a push block and a groove. Only the positions of the groove and the push block are different. Therefore, when docking with different front molds during use, the shape of the lever assembly is different. That is, when docking with the first male mold plate 12, the push block is directly below the first guide pin 7, thereby pushing the lever body 5 to allow the second guide pin 8 to slide into the groove, causing the first guide pin 7 and the second ejector plate 6 to rise. When docking with the second male mold plate 24, the push block is directly below the second guide pin 8, thereby driving the first guide pin 7 and the second ejector plate 6 to descend, thereby adjusting the size of the injection cavity during use.
[0032] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.
Claims
1. A two-color mold, comprising two left and right molds, each mold being provided with a front mold and a rear mold, the two rear molds being located above the two front molds, the two-color mold comprising a first rear mold portion (1), a first front mold portion (2), a second rear mold portion (13) and a second front mold portion (14), characterized in that: The first rear mold part (1) and the second rear mold part (13) have the same structure and can be swapped. A lever assembly is provided inside the first rear mold part (1). A plurality of guide pins are embedded in the bottom end surface of the first rear mold part (1). The guide pins can move up and down in the rear mold part and the bottom ends of the guide pins can extend to the bottom end surface of the first rear mold part (1). The bottom end surfaces of the left and right ends of the lever assembly are provided with guide pins in contact with the lever assembly. A groove is provided on the front mold at the position of the guide pin on one side of the lever assembly. When the front mold and the rear mold are fastened, the lever assembly is in a state where one side is tilted up and the other side is sunken due to the existence of the groove on the front mold. The states of the lever assemblies of the left and right molds are different.
2. A two-color mold according to claim 1, characterized in that: The lever assembly comprises a support block (29) and a lever, one end of the support block (29) is fixed in the rear mold, and the other end of the support block (29) is hinged to the lever.
3. A two-color mold according to claim 1, characterized in that: The lever assemblies are all arranged at the edge of the rear mold, and a second ejector plate (6) is slidably arranged in the vertical direction in the central area of the rear mold. The guide pins contacted by one end of each lever assembly close to the central area of the rear mold are fixedly connected to the second ejector plate (6). The bottom end surface of the second ejector plate (6) is fixedly connected to a plurality of ejector bodies, and a blanking assembly is arranged at the ejector body on each rear mold.
4. A two-color mold according to claim 1, characterized in that: The lever assemblies in the first rear mold part (1) are respectively arranged on the left and right sides of the rear mold, the guide pin contacted by the end of the lever assembly close to the edge of the rear mold is the second guide pin (8), and the guide pin contacted by the end of the lever assembly close to the central area inside the rear mold is the first guide pin (7), and the top end of the first guide pin (7) is fixedly connected to the second ejector plate (6).
5. A two-color mold according to claim 4, characterized in that: A cushion block (25) is sleeved on the end of the first guide pin (7), and the first guide pin (7) is mounted on the second ejector plate (6) via the cushion block (25).
6. A two-color mold according to claim 5, characterized in that: A roller (26) is installed on the end of the lever assembly that contacts the first guide pin (7), and the lever assembly contacts the cushion block (25) through the roller (26).
7. The two-color mold according to claim 3, characterized in that: The blanking component comprises a first ejector plate (4), a first ejector back plate (3), and a through needle, the top end of the through needle being embedded between the first ejector plate (4) and the first ejector back plate (3), the first ejector plate (4) being fixed to the bottom end surface of the first ejector back plate (3), a driving source for driving the first ejector back plate (3) to move up and down is provided above the first ejector back plate (3), the output end of the driving source is fixedly connected to the first ejector back plate (3), the through needle sequentially penetrates the first ejector plate (4), the second ejector plate (6), and the ejector body from top to bottom in the length direction, the bottom end surface of the ejector body serves as the top end surface of the inner cavity of the injection molded part cavity, and the bottom end of the through needle can extend into the cavity of the injection molded part.
8. The two-color mold according to claim 1, characterized in that: The bottom end of the rear mold is a female mold plate, the top end of the front mold is a male mold plate, the top end of the first front mold part (2) is a first male mold plate (12), and a groove is provided in an area of the first male mold plate (12) corresponding to the guide pin at the edge of the rear mold end face; the top end of the second front mold part (14) is a second male mold plate (24), and a groove is provided in an area of the second male mold plate (24) corresponding to the guide pin in the central area of the rear mold end face.