Double-color forming structure of plastic part mold

Abstract

The utility model discloses a double-color forming structure of a plastic part mould, which comprises a bottom plate, a rear mould core and a front mould core, a lower flexible glue waste head is formed in the rear mould core and the front mould core through injection molding, a water gap needle is arranged at the bottom end of the rear mould core in a penetrating manner, a catching groove is formed in a through hole of the water gap needle, and the catching groove is positioned above the water gap needle during injection molding. A water gap ejector pin is integrally formed at the top end of the water gap needle, so that an inverted buckle matched with the buckle groove is formed on the outer side of the lower soft rubber waste head and wraps the outer side of the water gap ejector pin, the lower soft rubber waste head can be conveniently ejected out through the water gap needle, and meanwhile the water gap needle and the lower soft rubber waste head can be conveniently separated.

Description

Technical Field

[0001] The utility model relates to the field of plastic injection molding, in particular to a structure for double-color molding of a plastic part mold. Background Art

[0002] Two-color injection molding refers to the process of injecting two different materials into the same mold, so that the molded parts are formed by two materials. Some of the two materials are different colors, and some are different in hardness and softness, thereby improving the aesthetics and assembly performance of the product.

[0003] In the two-color molding process, after the hard plastic PC / ABS is injected and the injection pressure is completed, the rear mold is rotated 180 degrees, and then the soft plastic TPU is injected. After the injection pressure is completed, the mold is opened to eject the soft plastic waste head. However, because there is an undercut on the sprue needle, it will fit inside the waste head, making it difficult for the front mold to remove the waste head. Utility Model Content

[0004] In order to overcome the deficiencies of the prior art, the utility model provides a structure for two-color molding of a plastic part mold, which can facilitate the pushing out of the lower soft rubber waste head from the pinhole and the separation of the lower soft rubber waste head and the nozzle needle, thereby improving the efficiency of material removal.

[0005] To solve the above technical problems, the utility model provides the following technical solutions: a structure for two-color molding of a plastic part mold, comprising a base plate, a rear mold core and a front mold core, a lower soft rubber waste head is formed in the rear mold core and the front mold core by injection molding, a sprue needle is penetrated through the bottom end of the rear mold core, a buckle groove is opened in the through hole of the sprue needle, and during injection molding, the buckle groove is located above the sprue needle, and a sprue ejector pin is integrally formed at the top of the sprue needle, so that the outer side of the lower soft rubber waste head forms an inverted buckle that cooperates with the buckle groove and is covered on the outer side of the sprue ejector pin, so that the lower soft rubber waste head can be ejected conveniently through the sprue needle, and the sprue needle and the lower soft rubber waste head can be separated conveniently.

[0006] As a preferred technical solution of the utility model, two square irons are fixed to the top of the bottom plate, a top pin plate is located between the two square irons at the top of the bottom plate, and a B plate is fixed to the top of the square irons.

[0007] As a preferred technical solution of the utility model, a nozzle needle is fixed to the top of the ejector plate, and the nozzle needle penetrates the B plate and the rear mold core.

[0008] As a preferred technical solution of the utility model, a plurality of ejectors are fixed to the top end of the ejector plate.

[0009] As a preferred technical solution of the utility model, the top of the B plate is provided with an A plate, the top of the A plate is provided with a stripping plate, and the top of the stripping plate is provided with an upper fixing plate.

[0010] As a preferred technical solution of the utility model, a shutter is provided between the A plate and the B plate.

[0011] As a preferred technical solution of the utility model, a nitrogen spring is arranged between the stripping plate and the A plate.

[0012] As a preferred technical solution of the utility model, a stripping plate is fixed to the bottom of the upper fixed plate.

[0013] Compared with the prior art, the utility model can achieve the following beneficial effects:

[0014] By designing a buckle groove set in the rear mold core and a sprue ejector at the top of the sprue needle, during injection molding, an undercut that engages with the buckle groove is formed on the outer side of the bottom end of the lower soft rubber waste head, and at the same time, the bottom of the lower soft rubber waste head is covered on the outer side of the sprue ejector, so that when the ejector plate pushes the sprue needle to move upward, it is convenient to push the lower soft rubber waste head out of the needle hole and to separate the lower soft rubber waste head and the sprue needle, thereby improving the efficiency of material removal. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the three-dimensional structure of the two-color mold of the utility model;

[0016] Figure 2 For this utility model Figure 1 A schematic diagram of the partially enlarged structure at center A;

[0017] Figure 3 This is a schematic diagram of the side view of the double-color mold of the utility model;

[0018] Figure 4 For this utility model Figure 3 Schematic diagram of the cross-section structure at AA in the middle;

[0019] Figure 5 For this utility model Figure 4 A schematic diagram of the partially enlarged structure at B in the middle;

[0020] Figure 6 This is a schematic diagram of the main structure of the two-color mold of the utility model;

[0021] Figure 7 For this utility model Figure 6 Schematic diagram of the cross-section structure at BB in the middle;

[0022] Among them: 1. Upper fixed plate; 2. Upper soft rubber waste head; 3. Stripping plate; 4. A plate; 5. B plate; 6. Square iron; 7. Ejector plate; 8. Bottom plate; 9. Water nozzle needle; 10. Undercut; 11. Lower soft rubber waste head; 12. Hard rubber product; 13. Soft rubber product; 14. Ejector; 15. Rear mold core; 16. Front mold core; 17. Stripping plate; 18. Buckle groove. DETAILED DESCRIPTION

[0023] In order to make the technical means, creative features, objectives and effects of the present invention easy to understand, the present invention is further described below in conjunction with specific embodiments, but the following embodiments are only preferred embodiments of the present invention, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the protection scope of the present invention.

[0024] Example

[0025] Please refer to Figure 1-Figure 7 As shown, the utility model provides a structure of two-color molding of a plastic part mold, the product includes a hard plastic product 12 and a soft plastic product 13, the soft plastic product 13 is located on the outside of the hard plastic product 12, the hard plastic product 12 is first formed by injection molding from the top of the mold, and then the soft plastic product 13 is injection molded, so as to achieve two-color molding; the injection mold is used to form the hard plastic product 12 from the top, and then the soft plastic product 13 is formed by injection molding from the side after the hard plastic product 12 is formed, so that the soft plastic product 13 can be covered on the outside of the hard plastic product 12;

[0026] On one side of the workpiece forming the soft rubber product 13, two square irons 6 are fixed on the top of the bottom plate 8, a pin plate 7 is arranged between the two square irons 6, a B plate 5 is fixed on the top of the square iron 6, and the B plate 5 is a long plate like the bottom plate 8, and is shared with the injection molding of the hard rubber product 12, the top of the B plate 5 is connected to the A plate 4 through an opener, a stripping plate 3 is arranged on the top of the A plate 4, and a nitrogen spring is arranged between the stripping plate 3 and the A plate 4, an upper fixed plate 1 is arranged on the top of the stripping plate 3, a mounting groove is opened at the center of the bottom end of the upper fixed plate 1, and a stripping plate 17 is arranged in the mounting groove;

[0027] A front mold core 16 is arranged inside the A plate 4, and runners are provided in the stripping plate 3, the A plate 4 and the front mold core 16, and the runners are located on both sides of the cavity of the front mold core 16, so that an upper soft rubber waste head 2 is left between the stripping plate 3 and the A plate 4 after the injection molding is completed. For the convenience of demoulding, the vertical runner of the upper soft rubber waste head 2 is larger at the top and smaller at the bottom, and the bottom end of the upper soft rubber waste head 2 is located at the joint of the A plate 4 and the front mold core 16. A rear mold core 15 matching with the front mold core 16 is arranged on the inner side of the top of the B plate 5, and pinholes are provided on the inner sides of the B plate 5 and the rear mold core 15, and a sprue needle 9 and an ejector pin 14 are inserted into the pinholes, and the pinhole of the sprue needle 9 is coaxial with and connected to the vertical runner of the front mold core 16, and the pinhole of the ejector pin 14 is located inside the cavity of the front mold core 16;

[0028] A buckle groove 18 is provided at the top of the hole wall of the rear mold core 15. During mold closing and injection molding, the top of the sprue needle 9 is located below the buckle groove 18, and the top of the sprue needle 9 is provided with an integrated sprue ejector pin, so that during injection molding, the plastic liquid flows into the pinhole of the rear mold core 15 through the vertical runner, and the outer side of the lower soft rubber waste head 11 formed thereby has an undercut 10 that cooperates with the buckle groove 18, and at the same time, the lower part of the lower soft rubber waste head 11 is covered with the sprue ejector pin, and the injection molding liquid then enters the mold cavity through the injection hole of the front mold core 16 for molding, and the molded lower soft rubber waste head 11 is connected to the upper soft rubber waste head 2, and the top of the lower soft rubber waste head 11 is connected to the upper soft rubber waste head 2. Part of it is located in the front mold core 16, and the bottom is connected to the nozzle needle 9 and is located in the rear mold core 15, and the lower soft rubber waste head 11 located in the front mold core 16 is small at the top and large at the bottom, so as to facilitate demoulding and separation; when demoulding, the nozzle ejector can make room for deformation when the undercut 10 is removed; a waste connector is formed by injection molding between the lower soft rubber waste head 11 and the soft rubber product 13, and the waste connector is formed by the cavity formed by the collision of two moving slides, and plastic liquid is injected into the cavity where the soft rubber product 13 is located through the cavity. At the same time, when the mold is opened, the slides on both sides of the waste connector move outward to prevent the waste connector from being stuck;

[0029] Mold opening sequence:

[0030] S1, the stripping plate 3 and the A plate 4 are opened by the nitrogen spring, and the separation distance is 35 mm. At this time, due to the increase in the height of the stripping plate 3, the upper soft glue waste head 2 is driven to be disconnected from the lower soft glue waste head 11 below;

[0031] S2, open the mold between the upper fixed plate 1 and the stripper plate 17, and the separation distance is 10 mm, so that the waste at the top of the upper soft rubber waste head 2 is separated from the interior of the upper fixed plate 1;

[0032] S3, then open the mold between the upper fixed plate 1 and the stripping plate 3, with a separation distance of 160 mm, so that the upper soft rubber waste head 2 can be taken out;

[0033] S4, when opening the mold in other steps, the shutter will pull the A plate 4 to delay the mold opening of the A plate 4, and the shutter will no longer work, so that the front mold core 16 is separated from the product after injection molding. At the same time, due to the cooperation of the undercut 10 and the buckle groove 18 on the outer side of the lower soft rubber waste head 11, when the lower soft rubber waste head 11 withdraws from the interior of the front mold core 16, the bottom end of the lower soft rubber waste head 11 is still inside the rear mold core 15;

[0034] S5, the ejector plate 7 starts, pushing the ejector 14 and the sprue needle 9 upward, thereby separating the hard rubber product 12 from the rear mold core 15, and at the same time making the lower soft rubber waste head 11 withdraw from the pinhole of the rear mold core 15, and then the two-color molded product and the lower soft rubber waste head 11 are taken out by the robot, and the demolding operation is completed.

[0035] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A structure for two-color molding of a plastic part mold, comprising a base plate (8), a rear mold core (15) and a front mold core (16), characterized in that: A lower soft rubber waste head (11) is formed in the rear mold core (15) and the front mold core (16) by injection molding. A nozzle needle (9) is penetrated at the bottom end of the rear mold core (15). A buckle groove (18) is opened in the through hole of the nozzle needle (9). During injection molding, the buckle groove (18) is located above the nozzle needle (9). The top of the nozzle needle (9) is integrally formed with a nozzle ejector pin, so that the outer side of the lower soft rubber waste head (11) forms an undercut (10) that cooperates with the buckle groove (18) and covers the outer side of the nozzle ejector pin. The nozzle needle (9) facilitates the ejection of the lower soft rubber waste head (11) and facilitates the separation of the nozzle needle (9) and the lower soft rubber waste head (11).

2. A structure for two-color molding of a plastic part mold according to claim 1, characterized in that: Two square irons (6) are fixed to the top of the bottom plate (8), a pin plate (7) is located at the top of the bottom plate (8) and between the two square irons (6), and a B plate (5) is fixed to the top of the square irons (6).

3. The structure of two-color molding of a plastic part mold according to claim 2, characterized in that: A nozzle needle (9) is fixed to the top end of the ejector plate (7), and the nozzle needle (9) penetrates the B plate (5) and the rear mold core (15).

4. The structure of two-color molding of a plastic part mold according to claim 2, characterized in that: A plurality of ejector pins (14) are fixed to the top end of the ejector pin plate (7).

5. The structure of two-color molding of a plastic part mold according to claim 2, characterized in that: The top of the B plate (5) is provided with an A plate (4), the top of the A plate (4) is provided with a stripping plate (3), and the top of the stripping plate (3) is provided with an upper fixing plate (1).

6. The structure of two-color molding of a plastic part mold according to claim 5, characterized in that: A shutter is provided between the A plate (4) and the B plate (5).

7. The structure of two-color molding of a plastic part mold according to claim 5, characterized in that: A nitrogen spring is arranged between the stripping plate (3) and the A plate (4).

8. The structure of two-color molding of a plastic part mold according to claim 5, characterized in that: A stripping plate (17) is fixed to the bottom of the upper fixing plate (1).

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