Injection mold

Abstract

The utility model relates to the technical field of 3C accessories, in particular to an injection mold which comprises a first mold core and a second mold core which are buckled with each other, the first mold core is detachably connected with an injection molding blank to be subjected to injection molding through a positioning structure, and an injection mold cavity is formed among the injection molding blank, the first mold core and the second mold core. A dummy blank jig which is profiled on an injection molding blank and replaces the injection molding blank is connected into the injection molding die cavity through a positioning structure, the injection molding die cavity is formed among the dummy blank jig, the first die core and the second die core, at least part of the injection molding die cavity is arranged on the dummy blank jig, and at least part of the injection molding die cavity arranged on the dummy blank jig has a draft angle. According to the utility model, the dummy blank jig is copied to the injection molding blank, the dummy blank jig replaces the injection molding blank to complete injection molding, and meanwhile, the plastic and the dummy blank jig can be quickly separated after injection molding is completed, so that the dummy blank jig is recycled, the injection molding blank is saved, and the risk of product quality defects generated in the equipment fluctuation period is reduced.

Description

Technical Field

[0001] This utility model relates to the field of 3C accessories technology, and more specifically, to injection molds. Background Technology

[0002] In injection molding plants for 3C components, the operating status of the injection molding machine will fluctuate briefly when it is first turned on or after an abnormal shutdown of more than 5 minutes. During this period, parameters such as injection pressure, injection speed, material temperature, and mold temperature are not stable, and the produced products are at risk of quality defects. To avoid such quality defects, the first 5 injection molding cycles are usually scrapped, which wastes the injection blanks from these 5 cycles. If this waste of injection blanks can be avoided, a lot of costs can be saved.

[0003] Meanwhile, most existing 3C accessory injection molding processes are nano-molding processes. The preforms before injection molding need to be treated with carbon to increase the bonding force between the plastic and the metal. In addition, due to the design requirements of 3C accessories, some adhesive-binding structures are made on the metal to further increase the bonding force between the metal and the plastic. Therefore, the preforms that have undergone nano-injection molding cannot quickly and effectively peel off the plastic. Utility Model Content

[0004] In view of this, the injection mold of this utility model aims to solve the above-mentioned technical problems.

[0005] The injection mold of this utility model includes a first mold core and a second mold core that interlock with each other. The first mold core is detachably connected to the injection blank to be injected through a positioning structure. An injection mold cavity is formed between the injection blank, the first mold core, and the second mold core. A dummy fixture that is shaped like the injection blank and replaces the injection blank is connected to the injection mold cavity through the positioning structure. The injection mold cavity is formed between the dummy fixture, the first mold core, and the second mold core. At least a portion of the injection mold cavity is disposed on the dummy fixture, and at least a portion of the injection mold cavity disposed on the dummy fixture has a draft angle.

[0006] In some embodiments of this application, the injection mold cavity includes a first injection molding groove disposed on the dummy preform fixture, and the first injection molding groove has the draft angle.

[0007] In some embodiments of this application, the first injection molding groove is a conical groove.

[0008] In some embodiments of this application, the outer peripheral surface of the dummy preform fixture has a lateral opening that communicates with the first injection molding groove.

[0009] In some embodiments of this application, the first mold core includes at least a mold slider that closes the side opening.

[0010] In some embodiments of this application, the injection mold cavity further includes a second injection molding groove disposed on the second mold core, and the second mold core is provided with an injection material inlet communicating with the second injection molding groove.

[0011] In some embodiments of this application, the positioning structure includes a positioning post fixed to the first mold core, and positioning holes for the positioning post to be inserted are respectively provided on the dummy blank fixture and the second mold core.

[0012] In some embodiments of this application, the inner circumferential surface of the dummy preform fixture has an inner opening that communicates with the first injection molding groove.

[0013] In some embodiments of this application, the second mold core includes at least a sealing portion that closes the inner opening.

[0014] In some embodiments of this application, the first injection molding groove and the second injection molding groove are interconnected.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: the dummy preform fixture in this utility model conforms to the injection molding blank, eliminates the physical glue-holding structure, does not undergo C-processing, and at least a portion of the injection mold cavity on the dummy preform fixture has a draft angle. This allows the dummy preform fixture to replace the injection molding blank in completing the injection molding process, and the plastic can be quickly separated from the dummy preform fixture after injection molding, thus enabling the dummy preform fixture to be reused. This saves injection molding blank material and also reduces the risk to product quality caused by equipment fluctuations. Attached Figure Description

[0016] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0017] Figure 1 An exploded view of the injection mold provided in this embodiment of the utility model;

[0018] Figure 2 A three-dimensional structural schematic diagram of the second mold core provided in an embodiment of this utility model;

[0019] Figure 3 A top view of the second mold core provided in an embodiment of this utility model;

[0020] Figure 4 A side view of the second mold core provided in an embodiment of this utility model;

[0021] Figure 5A three-dimensional structural schematic diagram of the dummy blank fixture provided in an embodiment of this utility model;

[0022] Figure 6 A top view of the dummy embryo fixture provided in an embodiment of this utility model;

[0023] Figure 7 A side view of the dummy embryo fixture provided in an embodiment of this utility model.

[0024] In the diagram: 1. First mold core; 11. Mold slider; 12. Positioning pin; 2. Second mold core; 21. Second injection molding groove; 22. Injection material inlet; 23. Sealing part; 3. Preform fixture; 31. First injection molding groove; 32. Side opening; 33. Inner opening; 34. Positioning hole; 4. Plastic. Detailed Implementation

[0025] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0026] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "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 application 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 application.

[0027] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0028] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0029] Combination Figure 1-7As shown, in one aspect, the injection mold provided in this embodiment includes a first mold core 1 and a second mold core 2 that are interlocked with each other. The first mold core 1 is detachably connected to the injection blank to be injected through a positioning structure. An injection mold cavity is formed between the injection blank, the first mold core 1, and the second mold core 2. The injection mold cavity is characterized in that a dummy blank fixture 3, which is shaped like the injection blank and replaces the injection blank, is connected to the injection mold cavity through a positioning structure. An injection mold cavity is formed between the dummy blank fixture 3, the first mold core 1, and the second mold core 2. At least a portion of the injection mold cavity is disposed on the dummy blank fixture 3, and at least a portion of the injection mold cavity disposed on the dummy blank fixture 3 has a draft angle.

[0030] Specifically, injection-molded preforms include, for example, the mid-frame of a mobile phone.

[0031] Understandably, this embodiment improves upon traditional injection mold design by introducing a dummy preform fixture 3. During periods of fluctuation in injection molding machine operation, the dummy preform fixture 3 is used instead of the injection blank for injection molding, avoiding product waste due to quality defects in products produced during these periods, thereby saving costs. Simultaneously, the dummy preform fixture 3 conforms to the shape of the injection blank, eliminating the physical adhesive-holding structure and requiring no C-processing. Furthermore, at least a portion of the injection mold cavity on the dummy preform fixture 3 has a draft angle, which helps simplify the demolding process, reducing the risk of mold wear and product damage. After injection molding, the plastic 4 can be quickly separated from the dummy preform fixture 3, enabling its recycling. In short, while saving injection blank material, it also reduces the risk to product quality caused by equipment fluctuations.

[0032] C-treatment is a surface treatment process used in nano-injection molding, primarily for metal parts. It involves creating micro- or nano-scale pores or rough structures on the metal surface using chemical or physical methods to enhance the bonding between the metal and the plastic.

[0033] In one specific embodiment of this application, the injection mold cavity includes a first injection molding groove 31 disposed on the dummy blank fixture 3, and the first injection molding groove 31 has a draft angle.

[0034] Specifically, in this embodiment, the draft angle is preferably 10°.

[0035] It is understood that in this embodiment, the injection mold cavity is the space in the injection mold used to form the shape of the product. During the injection molding process, the injection material is injected into the mold cavity through the injection molding machine, and after cooling, it forms the desired product. The first injection molding groove 31 is used to form part of the product shape during the injection molding process. The design of the draft angle facilitates demolding, so that the molded product can be smoothly removed from the mold, avoiding damage or deformation caused by sticking to the mold.

[0036] In one specific embodiment of this application, the first injection molding groove 31 is a conical groove.

[0037] Understandably, in this embodiment, the first injection molding groove 31 has a narrow bottom and a wide, tapered opening, which helps to more easily remove the finished product from the preform jig 3 during demolding. Since the plastic 4 adheres to the mold after cooling, the tapered groove design makes the demolding process smoother, reducing damage to the finished product and wear on the mold. Furthermore, the tapered groove structure makes the stress distribution on the preform jig 3 more uniform during use, extending the mold's service life.

[0038] In one specific embodiment of this application, the outer peripheral surface of the dummy fixture 3 has a lateral opening 32 that communicates with the first injection molding groove 31.

[0039] In one specific embodiment of this application, the first mold core 1 includes at least a mold slider 11 that closes the side opening 32.

[0040] It is understood that in this embodiment, the mold slider 11 can move to open or close the side opening 32. During the injection molding process, the mold slider 11 closes the side opening 32 to prevent the injection material from overflowing from the side opening 32, ensuring that the injection material only flows in the first injection molding groove 31, thereby ensuring the shape and quality of the product.

[0041] In one specific embodiment of this application, the injection mold cavity further includes a second injection molding groove 21 disposed on the second mold core 2, and an injection material inlet 22 communicating with the second injection molding groove 21 is provided on the second mold core 2.

[0042] Specifically, in this embodiment, the first injection molding groove 31 and the second injection molding groove 21 are interconnected.

[0043] It is understood that in this embodiment, the second injection molding groove 21 is used to form part of the product shape during the injection molding process, and the injection material inlet 22 is the channel for injecting injection material into the injection mold cavity. During the injection molding process, the injection material enters the second injection molding groove 21 and the first injection molding groove 31 of the injection mold cavity through the injection material inlet 22 and fills the entire injection mold cavity space, thereby achieving effective injection molding.

[0044] In one specific embodiment of this application, the positioning structure includes a positioning post 12 fixed on the first mold core 1, and positioning holes 34 for the positioning post 12 to be inserted are respectively provided on the dummy blank fixture 3 and the second mold core 2.

[0045] It is understood that the positioning structure in this embodiment is used to ensure that the first mold core 1, the second mold core 2 and the dummy blank fixture 3 can be accurately aligned during assembly, thereby ensuring the accuracy and consistency of the product, which not only improves production efficiency but also significantly enhances product quality.

[0046] In one specific embodiment of this application, the inner circumferential surface of the dummy blank fixture 3 has an inner opening 33 that communicates with the first injection molding groove 31.

[0047] In one specific embodiment of this application, the second mold core 2 includes at least a sealing portion 23 that closes the inner opening 33. Furthermore, the dummy preform fixture 3 has an inner groove on a surface near the second mold core 2 for the sealing portion 23 to enter. The number of first injection molding grooves 31 is several, and a protrusion is formed between adjacent first injection molding grooves 31. The first plane of the protrusion near the second mold core 2 is flush with the second plane of the mold slider 11 near the second mold core 2. The mold slider 11 has an annular structure, and the inner wall of the mold slider 11 is sealed to the outer peripheral surface of the dummy preform fixture 3.

[0048] Secondly, the injection material inlet 22 includes a first section that is perpendicular to the second plane, and a second section that is perpendicular to the first section and laterally connected to the second injection molding groove 21. That is, the injection material first contacts the second plane and then enters the second section, and finally enters the second injection molding groove 21.

[0049] Through the above structural design, the mold slider 11 can achieve, for example, the demolding of the dummy blank fixture 3 when it moves.

[0050] Understandably, in this embodiment, the dummy preform fixture 3 has an inner groove for the sealing part 23 to enter. The inner groove is provided with an inner opening 33 that communicates with the first injection molding groove 31. Since the second mold core 2 includes a sealing part 23 for closing the inner opening 33 during injection molding, and the mold slider 11 is used to close the side opening 32 during injection molding, the sealing of the molding process is ensured during injection molding. It can also precisely control the flow and distribution of the injection molding material, allowing the injection molding material to flow in the first injection molding groove 31, thereby improving the quality and consistency of the product.

[0051] Secondly, the injection material inlet 22 is divided into two sections. The first section is perpendicular to the second plane, and the second section is perpendicularly connected to the first section and laterally connected to the second injection molding groove 21. The second injection molding groove 21 is connected to the first injection molding groove 31. The injection material inlet 22 ensures that the material can flow along a predetermined path. By utilizing the synergistic effect of the sealing part and the mold slider, effective control of the injection process is achieved, thereby ensuring that the injection material fills the injection mold cavity and completes the product injection molding.

[0052] In another aspect, the defective product control method for injection molding machines using the aforementioned injection mold includes the following steps:

[0053] S1. Set the period between the initial startup of the injection molding machine and the period after the injection molding machine stops abnormally for a certain period of time before restarting as the injection molding debugging cycle.

[0054] S2. During the injection molding debugging cycle, the dummy blank fixture replaces the injection blank material, and an injection mold cavity is formed between the dummy blank fixture 3, the first mold core 1, and the second mold core 2. Dummy blank injection molding is performed on the dummy blank fixture to obtain a dummy blank injection molded integral part.

[0055] S3. At least a portion of the injection mold cavity on the dummy blank fixture 3 has a draft angle. After the dummy blank injection is performed during the injection molding debugging cycle, the dummy blank fixture 3 and the injection molding part of the dummy blank injection molded integral part are separated. The injection molded blank material replaces the dummy blank fixture 3, and normal injection molding is performed on the injection molded blank material to obtain the injection molded blank integral part.

[0056] In some embodiments of this application, the dummy preform is injected 1-N times within the injection molding commissioning cycle.

[0057] Specifically, in this embodiment, the dummy preform injection is set to 1-5 times within the injection molding debugging cycle. For example, 5 dummy preform injections are performed.

[0058] In some embodiments of this application, the period of abnormal shutdown of the injection molding machine is 1-N minutes.

[0059] Specifically, in this embodiment, the abnormal shutdown period of the injection molding machine is 1-5 minutes. For example, a shutdown of 5 minutes.

[0060] It is understood that the defective product control method for injection molding machines in this embodiment has the same beneficial effects as the injection mold, and will not be described in detail here.

[0061] It will be understood by those skilled in the art that the above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. Injection mold comprising a first mold half (1) and a second mold half (2) which are mutually coupled, the first mold half (1) being detachably connectable to an injection molding blank to be injection molded by means of a positioning structure, an injection molding cavity being formed between the injection molding blank, the first mold half (1) and the second mold half (2), characterized in that The positioning structure is connected with a dummy embryo jig (3) which is shaped according to the injection molding blank and replaces the injection molding blank in the injection molding cavity, the dummy embryo jig (3), the first mold core (1) and the second mold core (2) form the injection molding cavity, at least part of the injection molding cavity is arranged on the dummy embryo jig (3), and at least part of the injection molding cavity arranged on the dummy embryo jig (3) has a draft angle.

2. The injection mold of claim 1, wherein The injection molding cavity comprises a first injection molding groove (31) arranged on the dummy embryo jig, and the first injection molding groove (31) has the draft angle.

3. The injection mold of claim 2, wherein, The first injection molding groove (31) is a tapered groove.

4. The injection mold of claim 2, wherein, The dummy embryo jig (3) has a lateral port (32) which communicates with the first injection molding groove (31) on the outer peripheral surface.

5. The injection mold of claim 4, wherein, The first mold core (1) at least comprises a mold slider (11) which closes the lateral port (32).

6. The injection mold of claim 2, wherein, The injection molding cavity also comprises a second injection molding groove (21) arranged on the second mold core (2), and the second mold core (2) is provided with an injection material inlet (22) which communicates with the second injection molding groove (21).

7. The injection mold of claim 1, wherein, The positioning structure comprises a positioning column (12) fixed on the first mold core (1), and the dummy embryo jig (3) and the second mold core (2) are respectively provided with positioning holes (34) for inserting the positioning column (12).

8. The injection mold of claim 2, wherein, The dummy embryo jig (3) has an inner side port (33) which communicates with the first injection molding groove (31) on the inner peripheral surface.

9. The injection mold of claim 8, wherein, The second mold core at least comprises a sealing portion (23) which closes the inner side port (33).

10. The injection mold of claim 6, wherein, The first injection molding groove (31) and the second injection molding groove (21) communicate with each other.

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