Double-color mold structure for reducing white drawing deformation of hard rubber product

Abstract

The utility model relates to the technical field of injection molds, in particular to a double-color mold structure capable of reducing the pulling deformation of a hard rubber product. A double-color mold structure capable of reducing pulling deformation of a hard rubber product comprises a sliding block assembly, the sliding block assembly comprises a sliding block body and a positioning insert which is arranged on the sliding block body and used for being inserted into an opening of a product to be subjected to mold opening operation, and two pairs of auxiliary positioning pins are further arranged on the sliding block. The auxiliary positioning pins are used for being inserted into the open holes of the base during mold opening, the auxiliary positioning pins and the positioning insert cores are arranged at intervals, and the peripheral faces of the auxiliary positioning pins are used for being matched with the corresponding open holes of the base. Therefore, the problem that in the mold opening process of a double-color mold in the prior art, due to large adhesive force between the soft rubber and the mold, large stress is generated between the positioning insert core and the product, and the product is locally pulled white and deformed is solved.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, and in particular to a two-color mold structure that reduces the whitening and deformation of hard plastic products. Background Technology

[0002] Two-stage injection molding (also known as secondary molding, two-color injection molding, or overmolding) is a plastic processing technique that involves injecting different materials twice, either into the same mold or different molds, to create composite parts made of two or more materials. For example... Figure 1 The image shows a product manufactured by the applicant using a two-stage injection molding process. Specifically, the structure includes a base 1 and a covering film 2 covering the base 1. During the production process, the base 1 is first formed in a mold, then the formed base 1 is placed in another mold for a second injection molding process to form the covering film 2 on the base 1. Finally, the mold is opened, and the formed product is taken out.

[0003] In a two-stage injection molding process, the harder material is usually molded first, followed by the softer material. That is, the base is a hard plastic material, and the coating is a soft plastic material. After molding, the coating adheres to the mold, requiring external force during demolding. Figure 2 , Figure 3 and Figure 4 As shown, this is a schematic diagram of the slider assembly on the mold previously used by the applicant. The assembly includes a slider body 3, on which positioning inserts 4 are fixedly installed, capable of being inserted into openings 11 in the base. There are three pairs of positioning inserts 4, each pair of which is respectively located at corresponding openings 11 on both sides of the base 1. During mold opening, the positioning inserts 4 are inserted into the openings 11 in the base 1, and then the part of the mold that is attached to the covering film 2 is moved away from the product, thereby causing the product and the mold to separate.

[0004] However, as Figure 5 and Figure 6 As shown, in the above technical solution, the adhesion between the coating film 2 and the mold is relatively large. If the product and the mold are to be separated, the force on the positioning insert 4 will be relatively large. The positioning insert 4 is inserted into the opening 11 of the base 1, which also makes the force on the opening 11 relatively large. In the above solution, during the mold opening stage, the positioning insert will make the side of the opening 11 away from the coating film 2 subject to greater force, thereby generating a whitening area 111 and a deformation area 112 at the opening 11, which affects the quality of the product. Utility Model Content

[0005] In view of this, the present invention provides a two-color mold structure to reduce the whitening and deformation of hard plastic products, in order to solve the problem in the prior art where, during the mold opening process of two-color molds, the large adhesion between the soft plastic and the mold causes large stress between the positioning insert and the product, resulting in localized whitening and deformation of the product.

[0006] A two-color mold structure for reducing whitening deformation of hard plastic products includes a slider assembly for being disposed on the outside of the product to be molded and slidable relative to it. The slider assembly includes a slider body and positioning inserts disposed on the slider body for insertion into the opening of the product to be molded for mold opening operation. There are three pairs of positioning inserts, corresponding to the openings on both sides and the center of the product to be molded, respectively. The slider is also provided with two pairs of auxiliary positioning pins, which are used to be inserted into the opening of the base during mold opening. The auxiliary positioning pins are arranged at intervals with the positioning inserts, and the outer peripheral surface of the auxiliary positioning pins is used to adapt to the opening of the corresponding base.

[0007] Furthermore, the positioning insert has an insertion end that extends into the product, and the auxiliary positioning pin extends to the side wall of the opening in the base.

[0008] Furthermore, the insertion ends of the positioning inserts are arranged at intervals around the central axis of the base so that when they extend into the base, the insertion depth of the insertion ends of the positioning inserts into the base is the same.

[0009] Furthermore, the insertion end of the positioning insert is provided with a guide portion for insertion into the opening of the base, and the guide portion is a wedge-shaped structure provided at the end of the insertion end.

[0010] Furthermore, the end of the auxiliary positioning pin has a cubic structure.

[0011] The beneficial effects of the dual-color mold structure for reducing the whitening deformation of hard rubber products in this utility model are as follows: This utility model facilitates mold opening by setting a sliding component. Specifically, by setting the positioning inserts on the slider body, multiple positioning inserts can move synchronously. Since the positioning inserts can be inserted into the openings of the base, it is convenient to restrict the movement of the product during the mold opening process, facilitating the separation of the product and the mold. In addition, two pairs of auxiliary positioning pins are provided, which increase the contact area with the product, giving the product a larger force-bearing area during mold opening. Under the same force, the pressure on the force-bearing surface is naturally reduced, thereby reducing the possibility of whitening deformation of hard rubber products. Because the auxiliary positioning pins and positioning inserts are arranged at intervals, auxiliary positioning pins can be added to existing products, facilitating the modification of existing products and improving versatility. This solves the problem in the prior art where, during the mold opening process of dual-color molds, the large adhesion between the soft rubber and the mold causes large stress between the positioning inserts and the product, resulting in localized whitening deformation of the product. Attached Figure Description

[0012] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 Exploded view of the products manufactured by the applicant;

[0014] Figure 2 A schematic diagram of the slider assembly with a two-color mold structure used by the applicant;

[0015] Figure 3 A structural schematic diagram of the slider assembly with a two-color mold structure used by the applicant from another perspective (the product is attached);

[0016] Figure 4 A schematic diagram of the two-color mold structure slider assembly used by the applicant (the slider body is hidden);

[0017] Figure 5 Show the areas in the applicant's prior manufactured products that are prone to whitening;

[0018] Figure 6 Show the areas in the applicant's previously manufactured products that are prone to deformation;

[0019] Figure 7 This is a schematic diagram of the two-color mold structure for reducing the whitening and deformation of hard plastic products in this utility model (the slider body is hidden).

[0020] The labels in the diagram mean the following: 1. Base; 11. Opening; 111. Whitening area; 112. Deformation area; 2. Covering film; 3. Slider body; 4. Positioning insert; 5. Auxiliary positioning pin. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model is described below with reference to specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and not intended to limit the scope of the present utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the present utility model.

[0022] The terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The singular forms “a,” “the,” and “the” as used in this disclosure and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0023] It should be understood that although the terms first, second, third, etc., may be used in this disclosure to describe various information, such information should not be limited to these terms and should not be construed as indicating or implying relative importance. These terms are used only to distinguish information of the same type from one another. For example, without departing from the scope of this disclosure, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to determination."

[0024] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] In the description of this utility model, unless otherwise specified and limited, it should be noted that the terms "installation", "connection" and "linking" should be interpreted broadly. For example, they can refer to mechanical or electrical connections, or internal connections between two components. They can be direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0026] In the following description, the use of suffixes such as "module," "part," or "unit" to denote elements is solely for the purpose of illustrating this invention and has no specific meaning in itself. Therefore, "module" and "part" can be used interchangeably.

[0027] To better understand the technical solution of this utility model, the following detailed description of this utility model is provided in conjunction with the accompanying drawings.

[0028] In Embodiment 1 of this utility model, which reduces the whitening and deformation of hard plastic products using a two-color mold structure (hereinafter referred to as the two-color mold structure):

[0029] like Figure 7As shown, the dual-color mold structure in this embodiment mainly includes a slider assembly. The slider assembly includes a slider body 3 and positioning inserts 4 disposed on the slider body 3. The positioning inserts 4 are used to insert into the openings 11 of the base 1 to fix the product during mold opening, facilitating the separation of the product from the mold. There are three pairs of positioning inserts 4, each pair having an insertion end for insertion into the openings 11 of the base 1. There are five pairs of openings 11 on the base 1, with two pairs of positioning inserts 4 corresponding to the openings 11 at the edge of the base 1, and another pair corresponding to the opening 11 at the center of the base 1. Two pairs of auxiliary positioning pins 5 are also provided on the slider. The auxiliary positioning pins 5 are also used to insert into the openings 11 of the base 1 during mold opening, and are arranged at intervals with the positioning inserts 4.

[0030] Specifically, the slider has a clearance groove for avoiding the base 1. The positioning insert 4 is mounted on the slider, and the insertion end of the positioning insert 4 extends out of the clearance groove. The insertion ends of the positioning inserts 4 are spaced apart around the central axis of the base 1, so that the insertion depth of the insertion ends is approximately the same when inserted into the base 1. The insertion end of the positioning insert 4 is provided with a guide portion for insertion into the opening 11 of the base 1. The guide portion is a wedge-shaped structure provided at the end of the insertion end, so that when the positioning insert 4 is inserted into the opening 11 of the base 1, it can provide a certain guiding effect and avoid abutting against the outer peripheral surface of the base 1, which would cause damage to the base 1.

[0031] As a supplement, auxiliary positioning pins 5 are also fixed on the slider body 3, corresponding to the second and fourth pairs of openings 11 on the base 1, respectively. This allows the auxiliary positioning pins 5 and positioning inserts 4 to simultaneously limit the openings 11 on the base 1 during mold opening. The auxiliary positioning pins 5 allow for improvements to existing slider assemblies, enabling upgrades and reducing replacement costs. Furthermore, the ends of the auxiliary positioning pins 5 are cubical, extending to the sidewall of the opening 11 on the base 1. This means the auxiliary positioning pins 5 have a short extension length, only contacting the sidewall of the base 1 during use and not extending inwards. The upper and lower end faces of the positioning inserts 4 are flush with the upper and lower end faces of the auxiliary positioning pins 5. When the positioning inserts 4 can enter the openings 11 of the base 1, the auxiliary positioning pins 5 can also be inserted into the openings 11 of the base 1.

[0032] In use, the base 1 is first formed, then the base 1 is transferred to another mold, and the coating film 2 is injected again. After forming, the mold needs to be opened. Since the coating film 2 and the mold are easily attached together, the slider body 3 is moved so that the positioning insert 4 and auxiliary positioning pin 5 on the slider body 3 are inserted into the opening 11 of the base 1. Then the mold and the coating film 2 are separated from each other.

[0033] It should be understood that the described embodiments are merely some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

Claims

1. A two-color mold structure for reducing the distortion of a hard rubber product during the ejection, characterized by: The application relates to a slider assembly for setting on the outer side of a product to be unmolded and capable of relative sliding, which comprises a slider body and positioning inserts arranged on the slider body and used for being inserted into the opening holes of the product to be unmolded to perform the unmolding operation, the positioning inserts are arranged in three pairs and correspond to the opening holes on the two sides and the center of the product to be unmolded, and two pairs of auxiliary positioning pins are further arranged on the slider body and used for being inserted into the opening holes of the base during the unmolding, the auxiliary positioning pins are arranged at intervals with the positioning inserts, and the outer circumferential surface of the auxiliary positioning pins is used for being matched with the opening holes of the corresponding base.

2. The two-color mold structure for reducing the pullback deformation of a hard gel product according to claim 1, characterized by: The positioning inserts have insertion ends extending into the product, and the auxiliary positioning pins extend to the side wall of the opening hole of the base.

3. The two-color mold structure for reducing the pullback deformation of a hard gel product according to claim 1 or 2, characterized by: The insertion ends of the positioning inserts are arranged at intervals around the central axis of the base, so that the insertion ends of the positioning inserts have the same insertion depth into the base when extending into the base.

4. The two-color mold structure for reducing the pullback deformation of a hard gel product according to claim 1 or 2, characterized by: The insertion ends of the positioning inserts are provided with guide portions for being inserted into the opening holes of the base, and the guide portions are wedge-shaped structures arranged at the end portions of the insertion ends.

5. The two-color mold structure for reducing the pullback deformation of a hard gel product according to claim 1 or 2, characterized by: The end portions of the auxiliary positioning pins are in cubic structures.

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