Double-color mold

Abstract

The utility model discloses a double-color mold hidden type pouring gate, and relates to the technical field of double-color molds, the double-color mold hidden type pouring gate comprises a base structure fixed mold and an outer layer structure fixed mold, and the base structure fixed mold is provided with a base structure pouring gate; the movable mold comprises a forming part and a closing part, the forming part is provided with an outer-layer structure pouring gate, the foundation structure fixed mold, the forming part and the closing part jointly form a foundation structure cavity used for pouring a foundation structure, and an outer-layer structure cavity used for pouring an outer-layer structure is formed between the outer-layer structure fixed mold and the forming part; and the outer-layer structure cavity covers the pouring gate residue of the foundation structure. The double-color mold structure has the effect of reducing sprue residues in the double-color mold process, so that the attractiveness of the product appearance is improved.

Description

Technical Field

[0001] The present application relates to the technical field of two-color molds, and in particular to a two-color mold. Background Art

[0002] Through precise equipment control and meticulous mold design, two-shot injection molding can produce products with complex structures and multifunctional properties. This technology has high requirements for material selection, process parameters, and equipment performance, but it can significantly improve product market competitiveness and customer satisfaction.

[0003] The two-shot injection molding process is a set of precise manufacturing steps. At the first injection molding position, one material is injected through the first gate (a gate is a channel connecting the injection molding machine nozzle and the mold cavity. The main function of the gate is to transfer the molten plastic from the injection molding machine barrel to the mold cavity) to form the basic structure of the product. The mold is initially cooled inside the mold. At this time, the first gate residue is formed on the basic structure. Subsequently, a part of the mold (usually the movable mold) is rotated 180 degrees or transferred by a robot to the second injection molding position. A second injection molding is performed through the second gate to inject the second material into the partially solidified basic structure to form the outer structure or specific functional area of ​​the product. At this time, in addition to the first gate residue, the second gate residue is also formed on the outer structure. The entire product is then further cooled and solidified in the mold to ensure the close bonding of the two materials and the stability of the product dimensions. Finally, after the product is fully solidified, it is removed from the mold by a precisely designed demolding system and undergoes subsequent quality inspection and processing, completing the entire two-shot injection molding process.

[0004] In related technology, a Chinese patent document with authorization publication number CN219838110U discloses a two-color injection molding module, comprising a single-color injection mold, a two-color injection mold, and a robotic arm. The single-color injection mold has a single-color front mold core and a single-color rear mold core, with the single-color rear mold core providing a molding position for the single-color product. The two-color injection mold is positioned adjacent to the single-color injection mold and has a two-color front mold core and a two-color rear mold core, with the two-color rear mold core providing a molding position for the two-color product. The gripping end of the robotic arm grabs the semi-finished product from the molding position for the single-color product, transfers it, and inserts it into the molding position for the two-color product. The single-color rear mold core is provided with an ejector insert, with the molding position for the single-color product located on the ejector insert. The ejector insert is driven by a single-color ejection mechanism and ejects the product toward the mold opening direction. This utility model utilizes a robotic arm for transfer and implantation, minimizing the time and distance required for transferring the single-color product, addressing the technical issue of deformation of the single-color product and improving product quality.

[0005] However, the products molded by the related technology have two gate residues, which affects the appearance of the product. Utility Model Content

[0006] In order to reduce gate residue in the two-color mold process and thus improve the aesthetics of the product appearance, the present application provides a two-color mold.

[0007] This application provides a two-color mold, which adopts the following technical solution:

[0008] A two-color mold, comprising:

[0009] A basic structure fixed mold and an outer layer structure fixed mold, wherein the basic structure fixed mold is provided with a basic structure gate;

[0010] The movable mold includes a molding part and a closing part, the molding part is provided with an outer layer structure gate, the basic structure fixed mold, the molding part and the closing part together form a basic structure cavity for casting the basic structure, an outer layer structure cavity for casting the outer layer structure is formed between the outer layer structure fixed mold and the molding part, and the outer layer structure cavity covers the basic structure gate residue.

[0011] By adopting this technical solution and through mold design, the outer layer cavity of the second injection mold can cover the base structure gate residue of the first injection mold. In this way, when the product is ejected from the mold, the base structure gate residue is hidden under the outer layer, improving the product's aesthetic appearance.

[0012] Optionally, the closing portion is slidably arranged on the forming portion. When the basic structure is cast, the closing portion moves to a position where the closing portion forms a side wall of the basic structure cavity. When the outer structure is cast, the closing portion moves to the outside of the outer structure cavity.

[0013] By adopting the above technical solution, the closing part is slidably arranged on the forming part so that the closing part can not only realize the function of serving as a mold when pouring the basic structure, but also does not affect the pouring process of the outer structure.

[0014] Optionally, the closing portion is provided with an inclined driving hole, and the basic structure fixed mold is provided with an inclined driving rod, and the driving rod is used to be inserted into the driving hole.

[0015] By adopting this technical solution, a drive rod is tilted on the base structure fixed mold, which is used to insert into the drive hole in the closing part. This mating relationship enables the closing part to move with the movement of the base structure fixed mold, ensuring that the closing part can be precisely adjusted according to the needs of the injection stage. By using an inclined drive mechanism between the closing part and the base structure fixed mold, the space utilization inside the mold is optimized while maintaining the compactness of the mold design.

[0016] Optionally, the forming portion is provided with a limiting portion, and limiting grooves are provided at both ends of the closing portion along its own moving direction, and the limiting grooves are provided correspondingly to the limiting portion.

[0017] By adopting this technical solution, the cooperation between the stopper groove and the stopper ensures that the sealing part stops accurately when it moves to the predetermined position during the injection molding process, ensuring that the gate residue is properly hidden within the product. This precise positioning reduces unnecessary friction and wear between the sealing part and the molding part, thereby extending the service life of the mold.

[0018] Optionally, two limiting parts are provided in mirror image, and two limiting grooves are provided in mirror image, and the limiting parts and the limiting grooves are provided in a one-to-one correspondence.

[0019] By adopting the above technical solution, the mirror-image limiting parts can provide support for the closing part on both sides, thereby increasing the overall rigidity of the mold and reducing the risk of deformation under high pressure; and this symmetrical design helps to maintain the balance and stability of the mold.

[0020] Optionally, the limiting portion is slidably disposed on the forming portion along a direction approaching or away from the closing portion, and an elastic member is connected between the limiting portion and the forming portion.

[0021] By adopting the above technical solution, an elastic member is connected between the limiting portion and the forming portion, which allows the limiting portion to automatically return to its initial position after being subjected to force, thereby providing a self-resetting mechanism.

[0022] Optionally, the limiting portion is formed with a guiding inclined surface.

[0023] By adopting the above technical solution, the guiding slope provides an inclined guiding path for the sliding of the limiting part, which helps it to move smoothly along a specific direction.

[0024] Optionally, the basic structure fixed mold is provided with a clearance groove, and the basic structure gate is provided on the inner wall of the clearance groove.

[0025] By adopting this technical solution, the recess provides a specific space for the gate, allowing it to be rationally placed within the mold, helping to optimize mold space utilization. Furthermore, the residual gate of the base structure can be embedded in the outer structure, reducing material waste caused by removing the residual gate, improving material utilization, and enhancing the connection strength between the base structure and the outer structure.

[0026] Optionally, the cross-sectional shape of the clearance groove is fan-shaped.

[0027] By adopting the above technical solution, the fan-shaped cross-section can reduce the stress concentration in the gate area because its smooth curve helps to disperse the internal stress generated during the injection molding process.

[0028] In summary, this application has at least one of the following beneficial effects:

[0029] 1. Through mold design, the outer layer cavity of the second injection mold can cover the base structure gate residue of the first injection mold. In this way, when the product is ejected from the mold, the base structure gate residue is hidden under the outer layer, improving the product's appearance;

[0030] 2. A drive rod is tilted on the base structure mold and inserted into the drive hole on the closure. This allows the closure to move with the base structure mold, ensuring precise position adjustment according to the needs of the injection molding process. By using an inclined drive mechanism between the closure and base structure mold, space utilization within the mold is optimized while maintaining a compact mold design.

[0031] 3. Through the cooperation of the limiting groove and the limiting part, the closing part can stop accurately when it moves to the predetermined position during the injection molding process, thus ensuring that the gate residue is properly hidden inside the product; precise positioning reduces unnecessary friction and wear between the closing part and the molding part, thereby extending the service life of the mold;

[0032] 4. An elastic member is connected between the limiting portion and the forming portion, which allows the limiting portion to automatically return to its initial position after being subjected to force, providing a self-resetting mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic diagram of the structure of the embodiment of the present application for displaying parts;

[0034] Figure 2 This is a schematic diagram of the structure of the embodiment of the present application for showing the residual basic structure;

[0035] Figure 3-1 This is a schematic diagram of the overall structure of the fixed mold of the basic structure of the embodiment of the present application;

[0036] Figure 3-2 This is a schematic diagram of the overall structure of the fixed mold of the outer structure of the embodiment of the present application;

[0037] Figure 4-1 This is a schematic diagram of a partial structure of an embodiment of the present application for illustrating a situation in which the closing portion on the movable mold has not moved;

[0038] Figure 4-2 This is a schematic diagram of the partial structure of the embodiment of the present application for showing the movement of the closing portion on the movable mold;

[0039] Figure 5-1 This is a schematic diagram of the structure of the embodiment of the present application for showing the basic structure on the fixed mold when the fixed mold is not moved;

[0040] Figure 5-2 This is a schematic diagram of the structure of the embodiment of the present application for showing the basic structure on the fixed mold after the fixed mold is moved;

[0041] Figure 6 yes Figure 5-2 Schematic diagram of the local enlarged structure at A in the middle;

[0042] Figure 7 This is a schematic diagram of the exploded structure of the embodiment of the present application for illustrating the limiting portion and the elastic member;

[0043] Figure 8 It is a schematic diagram of the local structure of the sealing portion used to illustrate an embodiment of the present application.

[0044] Explanation of the accompanying drawings: 2. Basic structure cavity; 3. Basic structure residue; 4. Outer layer structure cavity; 5. Basic structure fixed mold; 6. Basic structure gate; 7. Outer layer structure fixed mold; 8. Outer layer structure gate; 9. Moving mold; 91. Molding part; 92. Closing part; 93. Driving hole; 10. Driving rod; 11. Limiting part; 12. Guide slope; 13. Elastic part; 14. Limiting groove; 15. Give way groove. DETAILED DESCRIPTION

[0045] Through precise equipment control and meticulous mold design, two-shot injection molding can produce products with complex structures and multifunctional properties. This technology has high requirements for material selection, process parameters, and equipment performance, but it can significantly improve product market competitiveness and customer satisfaction.

[0046] The two-color injection molding process is a set of precise manufacturing steps. At the first injection position, a material is injected through the first gate (the gate is the channel connecting the injection molding machine nozzle and the mold cavity. The main function of the gate is to transport the molten plastic from the injection molding machine barrel to the mold cavity) to form the basic structure cavity 2 of the product, and the mold is initially cooled. At this time, the first gate residue is formed on the basic structure cavity 2; then, a part of the mold (usually the movable mold 9) is rotated 180 degrees or transferred to the second injection position by a robot, and the second gate is injected through the second gate. The second injection molding is carried out at the gate to inject the second material into the partially solidified basic structure cavity 2 to form the outer structure cavity 4 or specific functional area of ​​the product. At this time, in addition to the first gate residue, the second gate residue is also formed on the outer structure cavity 4; after that, the entire product is further cooled and solidified in the mold to ensure the close combination of the two materials and the stability of the product size; finally, after the product is completely solidified, it is removed from the mold through a precisely designed demoulding system, and subsequent quality inspection and processing are carried out to complete the entire two-color injection molding process.

[0047] However, since there are two gates, two gate residues will be formed on the part, resulting in insufficient aesthetics of the part. In addition, in some parts with light transmittance requirements, the gate residues will affect the light transmittance, making the light transmittance of the part unable to meet the requirements.

[0048] The parts molded in this application refer to Figure 1 and Figure 2 , including a basic structure cavity 2 and an outer structure cavity 4. The outer structure cavity 4 is covered in the basic structure cavity 2, so that the basic structure residue 3 is buried inside the outer structure cavity 4, so that only the outer structure cavity 4 residue is exposed on the outside of the part, thereby improving the aesthetics and light transmittance requirements of the part.

[0049] The present application is further described in detail below with reference to Figures 3-8.

[0050] The embodiment of the present application discloses a two-color mold, referring to Figures 3 and 4. The two-color mold includes a basic structure fixed mold 5, an outer layer structure fixed mold 7, and two movable molds 9 with the same structure. The basic structure fixed mold 5 is provided with a basic structure gate 6 (combined with Figures 5 and Figure 6 ), a basic structure cavity 2 for casting the basic structure is formed between the basic structure fixed mold 5 and the movable mold 9, and the basic structure cavity 2 is connected to the basic structure gate 6. The two movable molds 9 are arranged in parallel and can rotate simultaneously, with the rotation axis set at the midpoint of the line connecting the two movable molds 9. The movable mold 9 is provided with an outer layer structure gate 8. An outer layer structure cavity 4 for casting the outer layer structure is formed between the outer layer structure fixed mold 7 and the movable mold 9, and the outer layer structure gate 8 is connected to the outer structure cavity 4.

[0051] Referring to Figure 4 , the movable mold 9 includes a molding portion 91 and a closing portion 92. The closing portion 92 is slidably connected to the molding portion 91 and moves in a direction parallel to the movable mold 9. The outer layer structure gate 8 is provided in the molding portion 91. The closing portion 92 is used to form the side wall of the base structure cavity 2 during the casting of the base structure. Specifically, the closing portion 92 is used to form a portion of the outer wall of the base structure cavity 2.

[0052] When forming the basic structure cavity 2, the closing part 92 on the corresponding movable mold 9 moves to the corresponding position, so that the closing part 92 and the molding part 91 together form a part of the outer wall of the basic structure cavity 2, and then the basic structure fixed mold 5 is buckled with the corresponding movable mold 9, and the basic structure cavity 2 is cast through the basic structure gate 6. After the basic structure cavity 2 is cooled, the closing part 92 moves to the corresponding position so that the closing part 92 does not interfere with the outer layer structure fixed mold 7. The basic structure cavity 2 rotates 180° with the corresponding movable mold 9, and then the corresponding movable mold 9 is buckled with the outer layer structure fixed mold 7, so that the basic structure residue 3 is located inside the outer layer structure cavity 4, and the outer layer structure cavity 4 is cast through the outer layer structure gate 8. After that, the outer layer structure fixed mold 7 is separated from the corresponding movable mold 9, and the molded part is removed. At this time, only the outer layer structure cavity 4 remains on the outside of the part, thereby improving the aesthetics of the part.

[0053] 5 , the closing portion 92 is provided with an obliquely arranged driving hole 93 , and the basic structure fixed mold 5 is fixedly connected with an obliquely arranged driving rod 10 . The driving rod 10 corresponds to the driving hole 93 and can pass through and out of the driving hole 93 .

[0054] When forming the basic structure cavity 2, the basic structure fixed mold 5 moves in a direction perpendicular to the movable mold 9, so that the drive rod 10 passes through the drive hole 93. When the basic structure fixed mold 5 moves toward the movable mold 9, the closing portion 92 moves in a direction parallel to the movable mold 9 toward the basic structure fixed mold 5; when the basic structure fixed mold 5 moves away from the movable mold 9, the closing portion 92 moves in a direction parallel to the movable mold 9 toward the basic structure fixed mold 5.

[0055] The matching relationship between the driving rod 10 and the driving hole 93 enables the closing part 92 to move with the movement of the basic structure fixed mold 5, ensuring that the closing part 92 can be precisely adjusted in position according to the needs of the injection molding stage; by using an inclined driving mechanism between the closing part 92 and the basic structure fixed mold 5, the space utilization inside the mold is optimized while maintaining the compactness of the mold design.

[0056] Reference Figure 7 and Figure 8 The closing portion 92 has four limiting grooves 14 along its direction of movement, and the four limiting grooves 14 are symmetrically arranged. The forming portion 91 is provided with four limiting portions 11 corresponding to the limiting grooves 14. The limiting portions 11 are slidably connected to the forming portion 91 in a direction perpendicular to the movable mold 9. An elastic member 13 is connected between the limiting portions 11 and the forming portion 91. The elastic member 13 is a spring. The two end surfaces of the limiting portion 11 along the direction of movement of the closing portion 92 are formed with guide slopes 12, and the guide slopes 12 are arranged at an angle.

[0057] When the basic structure fixed mold 5 is buckled with the corresponding movable mold 9, the two limiting parts 11 close to the basic structure fixed mold 5 are both inserted into the corresponding limiting grooves 14; when the closing part 92 moves, the elastic part 13 is compressed and deformed, so that the closing part 92 can move. When the basic fixed mold moves to the point where the driving rod 10 disengages from the driving hole 93, the elastic part 13 restores its deformation, so that the two limiting parts 11 away from the basic structure fixed mold 5 in the horizontal direction are both inserted into the corresponding limiting grooves 14, thereby fixing the closing part 92 in a specific position, so that when the outer layer structure cavity 4 is formed, the closing part 92 does not interfere with the outer layer structure fixed mold 7.

[0058] The cooperation between the stopper groove 14 and the stopper portion 11 allows the sealing portion 92 to accurately stop when it moves to the predetermined position during the injection molding process, improving the reliability of the sealing portion 92's positioning and ensuring that the gate residue is properly hidden within the product. This precise positioning reduces unnecessary friction and wear between the sealing portion 92 and the molding portion 91, thereby extending the service life of the mold.

[0059] The guiding slope 12 provides an inclined guiding path for the sliding of the limiting portion 11 , thereby facilitating smooth movement of the limiting portion 11 in a specific direction.

[0060] Reference Figure 6 The basic structure fixed mold 5 is provided with a clearance groove 15, the cross section of the clearance groove 15 is fan-shaped, and the basic structure gate 6 is opened on the inner wall of the clearance groove 15. When the basic structure fixed mold 5 is buckled with the movable mold 9, the clearance groove 15 is located above the closed portion 92.

[0061] The clearance groove 15 controls the shape of the base structure residue 3 and provides a specific space for the gate, allowing it to be properly positioned within the mold, thus optimizing mold space utilization. Furthermore, the residual base structure gate 6 can be embedded in the outer structure cavity 4, reducing material waste caused by removing the gate residue and improving material utilization. It also enhances the connection strength between the base structure cavity 2 and the outer structure cavity 4.

[0062] The cross section of the relief groove 15 is fan-shaped, which can reduce the stress concentration in the gate area because its smooth curve helps to disperse the internal stress generated during the injection molding process.

[0063] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A two-color mold, characterized in that: include: A basic structure fixed mold (5) and an outer layer structure fixed mold (7), wherein the basic structure fixed mold (5) is provided with a basic structure gate (6); A movable mold (9), the movable mold (9) includes a molding part (91) and a closing part (92), the molding part (91) is provided with an outer layer structure gate (8), the basic structure fixed mold (5), the molding part (91) and the closing part (92) together form a basic structure cavity (2) for casting the basic structure, an outer layer structure cavity (4) for casting the outer layer structure is formed between the outer layer structure fixed mold (7) and the molding part (91), and the outer layer structure cavity (4) covers the residue of the basic structure gate (6).

2. A two-color mold according to claim 1, characterized in that: The closing portion (92) is slidably arranged on the forming portion (91). When the base structure is cast, the closing portion (92) moves to a position where the closing portion (92) forms a side wall of the base structure cavity (2). When the outer structure is cast, the closing portion (92) moves to the outside of the outer structure cavity (4).

3. A two-color mold according to claim 2, characterized in that: The closing portion (92) is provided with an inclined driving hole (93), and the basic structure fixed mold (5) is provided with an inclined driving rod (10), and the driving rod (10) is used to be inserted into the driving hole (93).

4. The two-color mold according to claim 2, characterized in that: The forming portion (91) is provided with a limiting portion (11), and the closing portion (92) is provided with limiting grooves (14) at both ends along its own moving direction, and the limiting grooves (14) are provided correspondingly to the limiting portion (11).

5. The two-color mold according to claim 4, characterized in that: The limiting parts (11) are provided in two mirror images, and the limiting grooves (14) are provided in two mirror images. The limiting parts (11) and the limiting grooves (14) are provided in a one-to-one correspondence.

6. The two-color mold according to claim 4, characterized in that: The limiting portion (11) is slidably arranged on the forming portion (91) in a direction approaching or moving away from the closing portion (92), and an elastic member (13) is connected between the limiting portion (11) and the forming portion (91).

7. The two-color mold according to claim 6, characterized in that: The limiting portion (11) is formed with a guiding inclined surface (12).

8. The two-color mold according to claim 1, characterized in that: The basic structure fixed mold (5) is provided with a clearance groove (15), and the basic structure gate (6) is provided on the inner wall of the clearance groove (15).

9. The two-color mold according to claim 8, characterized in that: The cross-sectional shape of the clearance groove (15) is fan-shaped.

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