Surface microstructured texture injection molding mold

Abstract

The utility model belongs to injection mold field especially, and it is a kind of surface microstructure texture injection molding mold, aiming at the problem that texture is easily damaged, big pullout angle destroys product right-angle appearance when deep bite texture product demoulding, present the following scheme, including matched use's main template and vice template, the opposite surface of main template and vice template is provided with corresponding injection cavity I and injection cavity II respectively, the side wall of injection cavity I is evenly provided with relief, the back of main template is provided with stress release cavity, the utility model discloses when using, texture wall has elasticity by stress release cavity, trace shrinkage when opening mould avoids the texture pull of forced ejection and leads to, it is favorable to promote product texture integrality, and need not make the pullout angle very big, meet the right-angle appearance requirement of product originally, avoid the appearance deformation caused by the pullout angle too big.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, and in particular to an injection mold for surface microstructure texture. Background Technology

[0002] In injection molding, many products require deep textured microstructures on their surfaces to meet specific aesthetic or functional requirements.

[0003] After these deep textures are formed, they will form a tight interlock with the plastic parts. In the conventional demolding process, directly using the forced ejection method can easily cause the texture on the surface of the plastic parts to break or fall off, affecting the quality of the product. In order to reduce the resistance during demolding, the industry often uses the method of increasing the product's draft angle. However, this approach will destroy the original right-angle appearance of the product and cannot achieve the preset shape requirements.

[0004] To address the aforementioned issues, this utility model proposes a surface microstructure texture injection molding die. Utility Model Content

[0005] This invention provides a surface microstructure texture injection molding die, which solves the shortcomings of the prior art, such as the texture being easily damaged during demolding of deep textured products and the large draft angle damaging the right-angle appearance of the product.

[0006] This utility model provides the following technical solution: A surface microstructure texture injection molding die, comprising: The main template and the secondary template are used together. The opposite sides of the main template and the secondary template are respectively provided with injection cavity I and injection cavity II. The side wall of injection cavity I is evenly distributed with raised texture. The back of the main template is provided with stress relief cavity.

[0007] In one possible design, the stress relief cavity is larger than the injection cavity I.

[0008] In one possible design, positioning pins are fixedly provided at the four corners of one side of the main template, and positioning slots for engaging the corresponding positioning pins are provided on one side of the sub-template.

[0009] In one possible design, the four corners of the back of the main template are provided with internal threaded grooves I for its installation and fixing, and the four corners of the back of the secondary template are provided with internal threaded grooves II for its installation and fixing.

[0010] In one possible design, the top of the inner walls of injection cavity I and injection cavity II are provided with the same injection hole.

[0011] In one possible design, multiple vent holes are provided on both sides of the inner walls of injection cavity I and injection cavity II.

[0012] In one possible design, a rigid support column is provided inside the stress relief cavity, and the end face of the rigid support column is in close contact with the inner wall of the stress relief cavity.

[0013] In one possible design, the raised texture is a deep-textured microstructure formed by an etching process, and both the main template and the secondary template are made of mold steel. It should be understood that the above general description and the following detailed description are merely exemplary and do not limit the present invention.

[0014] The working principle and usage process of this technical solution are as follows: During use, the mold is fixed to the corresponding installation position on the injection molding machine via the internal threaded groove I on the back of the main mold and the internal threaded groove II on the back of the secondary mold, ensuring the sealing and structural stability of the cavity after mold closing. The main and secondary molds are precisely aligned with the positioning pins and slots at the four corners, ensuring that the injection cavities I and II on opposite sides are completely aligned, forming a closed and complete injection cavity. The injection molding machine injects molten plastic into the closed cavity through the shared injection hole at the top of injection cavities I and II. During the injection process, air and melt volatiles in the cavity are quickly discharged through multiple vents on both sides of the cavity, preventing air bubbles. In case of molding defects such as material shortage, the high-pressure injection pressure of the injection molding machine acts on the textured inner wall of injection cavity I. Since there is a stress relief cavity on the back of the main mold plate, the side wall of injection cavity I forms a thin-walled structure. The high pressure will compress the thin-walled textured wall to fit tightly against the rigid support column behind, ensuring that the microstructure of the texture is accurately replicated on the surface of the plastic part. After maintaining the injection pressure until the plastic melt completely fills the cavity, the pressure holding stage is entered, allowing the plastic part to cool and solidify under high pressure. During this process, the existence of the stress relief cavity does not affect the support stability of the textured wall, and at the same time, it can release the internal stress generated by the temperature change of the mold, avoid cavity deformation, and ensure the molding dimensional accuracy. After the plastic part has cured, the injection molding machine drives the main mold plate to separate from the secondary mold plate and open the mold. As the injection pressure disappears, the plastic part shrinks due to cooling and wraps tightly around the core. At this time, the demolding resistance acts on the thin-walled textured wall of injection cavity I. Since the textured wall is thin and there is no rigid constraint on the back, a certain amount of inward elastic contraction will occur, which will instantly release the mechanical gripping force of the raised texture on the microstructure of the plastic part surface, achieving demolding without damage. After demolding, the thin-walled steel is reset under the action of elastic restoring force.

[0015] This utility model has the following beneficial effects: This invention uses a stress-relieving cavity to make the textured wall elastic. The slight shrinkage during mold opening avoids the texture being damaged by forced ejection, which helps to improve the integrity of the product texture. Furthermore, it eliminates the need for a large draft angle, thus meeting the original right-angle appearance requirements of the product and avoiding appearance deformation caused by an excessively large draft angle.

[0016] Compared with active demolding mechanisms such as sliders and inclined ejectors, this invention achieves passive demolding through the elastic deformation of the steel itself, eliminating complex moving parts, reducing mold processing costs, and significantly reducing assembly and maintenance difficulties. Attached Figure Description

[0017] Figure 1 A three-dimensional structural schematic diagram of a surface microstructure texture injection molding die provided for an embodiment of this utility model; Figure 2 This is a schematic diagram of another perspective of the surface microstructure texture injection molding die provided in an embodiment of the present utility model; Figure 3 This is a schematic diagram of the main template structure of an injection molding die for surface microstructure texture provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the sub-template structure of a surface microstructure texture injection molding die provided in an embodiment of the present invention.

[0018] Reference numerals: 1. Main template; 2. Secondary template; 3. Injection cavity I; 4. Raised lines; 5. Injection cavity II; 6. Stress relief cavity; 7. Positioning pin; 8. Positioning slot; 9. Internal thread groove I; 10. Internal thread groove II; 11. Injection hole; 12. Vent hole. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0020] In the description of this utility model, it should be understood that the terms "opening", "upper", "middle", "length", "inner", etc., which indicate orientation or positional relationship, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0021] To keep the following description of the embodiments of this utility model clear and concise, detailed descriptions of known functions and known components are omitted.

[0022] In one embodiment: Please refer to Figure 1-4 An injection molding mold, comprising: The main template 1 and the secondary template 2 are both made of high-strength mold steel. The opposite side of the main template 1 is machined with an injection cavity I3. The side wall of the injection cavity I3 is processed with uniformly distributed raised textures 4 through etching. The raised textures 4 constitute the deep textured microstructure of the product. The back of the main template 1 is excavated with a stress relief cavity 6. The outline size of the stress relief cavity 6 is larger than that of the injection cavity I3, so that the side wall corresponding to the injection cavity I3 forms a thin-walled structure with elastic deformation capability. This thin-walled structure can produce a small amount of shrinkage during demolding to release the constraint on the plastic part.

[0023] The four corners of one side of the main template 1 are fixed with positioning pins 7 by welding. The positioning pins 7 are made of wear-resistant alloy material. The side of the secondary template 2 is machined with positioning slots 8 corresponding to the positions of the positioning pins 7. The gap between the positioning pins 7 and the positioning slots 8 is controlled within a reasonable range to ensure the coaxiality and fit of the main template 1 and the secondary template 2 when they are connected.

[0024] The top of the inner walls of injection cavities I3 and II5 are machined with the same injection hole 11, which is connected to the injection channel of the injection molding machine and is used to introduce molten plastic into the cavity. Multiple vent holes 12 are machined on both sides of the inner walls of injection cavities I3 and II5. The vent holes 12 are evenly distributed along the side walls of the cavity, and their diameter is adapted to the gas discharge requirements during the injection process, so as to discharge air and volatiles of plastic melt in the cavity.

[0025] The stress relief cavity 6 of the main mold plate 1 is equipped with a rigid support column. The rigid support column is fixedly connected to the installation position of the injection molding machine. Its end face is tightly fitted with the inner wall of the back of the main mold plate 1, providing rigid support for the thin-walled textured wall during the injection process. In actual application, the injection molding machine drives the main mold plate 1 and the auxiliary mold plate 2 to close. The positioning pin 7 is inserted into the positioning slot 8 to achieve precise docking. The injection cavity I 3 and the injection cavity II 5 are combined to form a closed and complete cavity. The injection molding machine injects the molten plastic melt into the cavity under high pressure through the injection hole 11. The high pressure injection pressure acts on the textured side wall of the injection cavity I 3, so that the thin-walled textured wall is tightly attached to the rigid support column. The microstructure of the texture 4 is accurately replicated onto the surface of the plastic part. During the injection process, the air and volatiles in the cavity are smoothly discharged through the exhaust hole 12 to avoid molding defects such as bubbles and material shortage in the plastic part. After maintaining the injection pressure until the plastic melt completely fills the cavity, the pressure holding stage begins. The plastic part cools and solidifies under high pressure. The stress relief cavity 6 can release the internal stress generated by the temperature change of the mold, prevent the cavity from deforming, and ensure the dimensional accuracy of the plastic part. After the plastic part is solidified, the injection molding machine drives the main mold plate 1 and the secondary mold plate 2 to separate and open the mold. After the injection pressure disappears, the plastic part shrinks and tightens around the core due to cooling. The demolding resistance acts on the thin-walled textured wall of the injection cavity I3. Under the action of the resistance, the thin-walled structure undergoes a slight inward elastic contraction, instantly releasing the mechanical gripping force of the raised texture 4 on the microstructure of the plastic part surface, achieving non-destructive demolding. After demolding, the thin-walled textured wall returns to its initial state under the action of its own elastic restoring force, preparing for the next injection molding.

[0026] This application can be used in injection molding production, or in other fields applicable to this application.

[0027] In another embodiment: a surface microstructure textured injection molding mold, which is used in the field of injection molding, has a structure that is basically the same as the previous embodiment, the difference being: Please refer to Figure 1-2 The four corners of the back of the main template 1 are machined with internal thread grooves Ⅰ9, and the four corners of the back of the secondary template 2 are machined with internal thread grooves Ⅱ10. During assembly, bolts are passed through the internal thread grooves Ⅰ9 and Ⅱ10 to fix the main template 1 and the secondary template 2 to the corresponding installation positions of the injection molding machine, ensuring the sealing of the cavity and the stability of the overall structure after mold closing.

[0028] The accompanying drawings in this application are for illustrative purposes only. The dimensions and shapes of the components shown are not actual limitations but are merely schematic representations. In actual implementation, the components can be reasonably configured and adjusted according to specific needs and actual conditions.

[0029] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. In the absence of conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A surface microstructure texture injection molding die, characterized in that, include: The main template (1) and the secondary template (2) are used together. The opposite sides of the main template (1) and the secondary template (2) are respectively provided with corresponding injection cavity I (3) and injection cavity II (5). The side wall of the injection cavity I (3) is evenly distributed with raised texture (4). The back of the main template (1) is provided with stress relief cavity (6).

2. The surface microstructure texture injection molding die according to claim 1, characterized in that, The stress relief cavity (6) is larger than the injection molding cavity I (3).

3. The surface microstructure texture injection molding die according to claim 1, characterized in that, The main template (1) has four fixed positioning pins (7) on one side, and the sub-template (2) has a positioning slot (8) on one side for docking with the corresponding positioning pin (7).

4. The surface microstructure texture injection molding die according to claim 1, characterized in that, The main template (1) has internal threaded grooves I (9) at each of the four corners on the back side for its installation and fixing, and the secondary template (2) has internal threaded grooves II (10) at each of the four corners on the back side for its installation and fixing.

5. The surface microstructure texture injection molding die according to claim 1, characterized in that, The top of the inner walls of injection cavity I (3) and injection cavity II (5) are provided with the same injection hole (11).

6. The injection mold for surface microstructure texture according to claim 1, characterized in that, Multiple vent holes (12) are provided on both sides of the inner wall of injection cavity I (3) and injection cavity II (5).

7. The surface microstructure texture injection molding die according to claim 1, characterized in that, The stress relief cavity (6) is provided with a rigid support column inside, and the end face of the rigid support column is in close contact with the inner wall of the stress relief cavity (6).

8. The surface microstructure texture injection molding die according to claim 1, characterized in that, The raised texture (4) is a deep-textured microstructure formed by etching process, and the main template (1) and the secondary template (2) are both made of mold steel.

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