Injection mold and defective product control method for injection molding machine

Abstract

The invention relates to the technical field of 3C accessories, in particular to an injection mold and a defective product control method for an injection molding.The injection mold 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. The dummy blank jig is profiled to the injection molding blank, the dummy blank jig replaces the injection molding blank to complete injection molding, meanwhile, plastic and the dummy blank jig can be rapidly separated after injection molding is completed, recycling of the dummy blank jig is achieved, 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] The present invention relates to the technical field of 3C accessories, and more particularly to a method for controlling defective products for an injection mold and an injection molding machine. Background Art

[0002] In the injection molding station of 3C accessories, when the injection molding machine is just started up, or restarted after abnormal shutdown for more than 5 minutes, there will be a short-term fluctuation period in the operating state of the equipment. During the fluctuation period, parameters such as injection pressure, injection speed, material temperature, and mold temperature are not stable, and there is a risk of quality defects in the produced products. To avoid such quality defects, usually the products of the first 5 molding cycles are scrapped, which will waste the injection blanks of these 5 molding cycles. If such waste of injection blanks can be avoided, a large amount of cost can be saved.

[0003] At the same time, the existing injection molding process for 3C accessories is mostly a nano-molding process. The blanks before injection need to be treated with C to increase the bonding force between the plastic and the metal. In addition, due to the design requirements of 3C accessories, some glue-gripping structures are made on the metal to further increase the bonding force between the metal and the plastic. Therefore, the blanks after nano-injection molding cannot be quickly and effectively peeled off the plastic. Summary of the Invention

[0004] In view of this, the present invention provides a method for controlling defective products for an injection mold and an injection molding machine, aiming to solve the problems existing in the current technology.

[0005] On the one hand, the present invention provides an injection mold, which includes a first mold core and a second mold core that are buckled with each other. The first mold core is detachably connected to an 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. It is characterized in that a dummy blank jig that is shaped like the injection blank and replaces the injection blank is connected in the injection mold cavity through the positioning structure. An injection mold cavity is formed between the dummy blank jig, the first mold core, and the second mold core. At least part of the injection mold cavity is arranged on the dummy blank jig, and at least part of the injection mold cavity arranged on the dummy blank jig has a draft angle.

[0006] In some embodiments of the present application, the injection mold cavity includes a first injection molding groove arranged on the dummy blank jig, and the first injection molding groove has the draft angle.

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

[0008] In some embodiments of the present application, a lateral port communicating with the first injection molding groove is provided on the outer peripheral surface of the dummy blank jig.

[0009] In some embodiments of the present application, the first mold core at least includes a mold slider that closes the lateral port.

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

[0011] In some embodiments of the present application, the positioning structure includes a positioning post fixed on the first mold core, and positioning holes for inserting the positioning post are respectively provided on the dummy embryo jig and the second mold core.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: The dummy embryo jig in the present invention is shaped like an injection embryo, removes the physical glue-gripping structure, does not perform C treatment, and at least part of the injection mold cavity on the dummy embryo jig has a draft angle, which can enable the dummy embryo jig to replace the injection embryo to complete injection molding, and can quickly separate the plastic from the dummy embryo jig after injection molding, so as to realize the recycling of the dummy embryo jig. While saving injection embryos, it can also reduce the risk of product quality caused by equipment fluctuation periods.

[0013] On the other hand, the present invention also proposes a method for controlling defective products of an injection molding machine. Using the injection mold described above, the method includes the following steps: S1. Set a period from when the injection molding machine is just started and when the injection molding machine is restarted after being abnormally stopped for a period of time as the injection molding debugging period; S2. During the injection molding debugging period, replace the injection embryo with the dummy embryo jig, and an injection mold cavity is formed between the dummy embryo jig, the first mold core, and the second mold core. Perform dummy embryo injection molding on the dummy embryo jig to obtain a dummy embryo injection molded one-piece. S3. At least part of the injection mold cavity provided on the dummy embryo jig has a draft angle. After performing the dummy embryo injection molding during the injection molding debugging period, separate the dummy embryo jig and the injection molding part of the dummy embryo injection molded one-piece, and replace the dummy embryo jig with the injection embryo, and perform normal injection molding on the injection embryo to obtain an injection embryo molded one-piece.

[0014] In some embodiments of the present application, 1-N times of the dummy embryo injection molding are set during the injection molding debugging period.

[0015] In some embodiments of the present application, the period of abnormal shutdown of the injection molding machine is 1-N minutes.

[0016] It can be understood that the method for controlling defective products of the injection molding machine in this embodiment has the same beneficial effects as the above injection mold, and will not be repeated here. Description of the Drawings

[0017] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the following detailed description of the preferred embodiments. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present invention. Also, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings: Figure 1 is an exploded structural schematic diagram of an injection mold provided by an embodiment of the present invention; Figure 2 is a three-dimensional structural schematic diagram of a second mold core provided by an embodiment of the present invention; Figure 3 is a top view of a second mold core provided by an embodiment of the present invention; Figure 4 is a side view of a second mold core provided by an embodiment of the present invention; Figure 5 is a three-dimensional structural schematic diagram of a dummy embryo jig provided by an embodiment of the present invention; Figure 6 is a top view of a dummy embryo jig provided by an embodiment of the present invention; Figure 7 is a side view of a dummy embryo jig provided by an embodiment of the present invention.

[0018] In the figure: 1, the first mold core; 11, the mold slider; 12, the positioning post; 2, the second mold core; 21, the second injection molding groove; 22, the injection material inlet; 23, the sealing part; 3, the dummy embryo jig; 31, the first injection molding groove; 32, the side port; 33, the inner port; 34, the positioning hole; 4, the plastic. Detailed Embodiments

[0019] Next, exemplary embodiments of the present disclosure will be described in more detail with reference to the drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be completely conveyed to those skilled in the art. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. Next, the present invention will be described in detail with reference to the drawings and in combination with the embodiments.

[0020] In one aspect, referring to Figure 1-7As shown in the figure, the injection mold provided in this embodiment includes a first mold core 1 and a second mold core 2 that are buckled with each other. The first mold core 1 is detachably connected to the injection blank to be injection-molded through a positioning structure. An injection mold cavity is formed among the injection blank, the first mold core 1, and the second mold core 2. It is characterized in that a dummy fixture 3 that is shaped like the injection blank and replaces the injection blank is connected in the injection mold cavity through the positioning structure. An injection mold cavity is formed among the dummy fixture 3, the first mold core 1, and the second mold core 2. At least part of the injection mold cavity is arranged on the dummy fixture 3, and at least part of the injection mold cavity arranged on the dummy fixture 3 has a draft angle.

[0021] Specifically, the injection blank is, for example, a mobile phone middle frame or the like.

[0022] It can be understood that in this embodiment, by introducing the dummy fixture 3, the traditional injection mold design is improved. During the fluctuation period of the injection molding machine operation, the dummy fixture 3 is used to replace the injection blank for injection molding, avoiding product waste caused by quality defects in the products produced during the fluctuation period of the injection molding machine, and thus saving costs. At the same time, the dummy fixture 3 is shaped like the injection blank, removing the physical glue-gripping structure and not performing C treatment, and at least part of the injection mold cavity on the dummy fixture 3 has a draft angle, which helps to simplify the demolding process, reduce the risk of mold wear and product damage, and the plastic 4 and the dummy fixture 3 can be quickly separated after injection molding, so as to realize the recycling of the dummy fixture 3. That is, while saving the injection blank, it can also reduce the risk of product quality caused by the equipment fluctuation period.

[0023] Among them, C treatment is a surface treatment process in nano-injection molding, mainly used for metal parts. By chemical or physical methods, micro-nano scale holes or rough structures are formed on the metal surface to enhance the bonding force between the metal and the plastic.

[0024] In a specific embodiment of the present application, the injection mold cavity includes a first injection molding groove 31 arranged on the dummy fixture 3, and the first injection molding groove 31 has a draft angle.

[0025] Specifically, the draft angle in this embodiment is preferably 10°.

[0026] It can be understood that the injection mold cavity in this embodiment is the space in the injection mold for forming the product shape. During the injection molding process, the injection material is injected into the mold cavity through the injection molding machine and forms the required product after cooling. 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 formed product can be smoothly taken out of the mold, avoiding damage or deformation caused by sticking to the mold.

[0027] In a specific embodiment of the present application, the first injection molding groove 31 is a tapered groove.

[0028] It can be understood that in this embodiment, the bottom of the first injection molding groove 31 is relatively narrow while the opening is relatively wide, presenting a conical shape, which helps to more easily remove the finished product from the dummy embryo fixture 3 during demolding. Since the plastic 4 adheres to the mold after cooling, the design of the conical groove makes the demolding process smoother, reducing damage to the finished product and wear of the mold. In addition, the structure of the conical groove makes the stress distribution on the dummy embryo fixture 3 more uniform during use, extending the service life of the mold.

[0029] In a specific embodiment of the present application, a lateral opening 32 communicating with the first injection molding groove 31 is provided on the outer peripheral surface of the dummy embryo fixture 3.

[0030] In a specific embodiment of the present application, the first mold core 1 at least includes a mold slider 11 that closes the lateral opening 32.

[0031] It can be understood that in this embodiment, the mold slider 11 can move to open or close the lateral opening 32. During the injection molding process, the lateral opening 32 is closed by the mold slider 11 to prevent the injection material from overflowing from the lateral opening 32, ensuring that the injection material only flows within the first injection molding groove 31, thereby guaranteeing the shape and quality of the product.

[0032] In a specific embodiment of the present application, the injection mold cavity further includes a second injection molding groove 21 provided 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.

[0033] Specifically, the first injection molding groove 31 and the second injection molding groove 21 in this embodiment communicate with each other.

[0034] It can be understood that the second injection molding groove 21 in this embodiment is used to form part of the product shape during the injection molding process, and the injection material inlet 22 is the channel opening for injecting the 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.

[0035] In a specific embodiment of the present application, the positioning structure includes a positioning post 12 fixed to the first mold core 1, and positioning holes 34 for inserting the positioning post 12 are respectively provided on the dummy embryo fixture 3 and the second mold core 2.

[0036] It can be 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 embryo fixture 3 can be accurately aligned during assembly, thereby guaranteeing the accuracy and consistency of the product, not only improving production efficiency but also significantly enhancing product quality.

[0037] In a specific embodiment of the present application, an inner side opening 33 communicating with the first injection molding groove 31 is provided on the inner peripheral surface of the dummy mold fixture 3.

[0038] In a specific embodiment of the present application, the second mold core 2 at least includes a sealing portion 23 that closes the inner side opening 33. Secondly, a surface of the dummy mold fixture 3 close to the second mold core 2 has an inner groove body for the sealing portion 23 to enter, and the number of the first injection molding grooves 31 is several. A convex body is formed between two adjacent first injection molding grooves 31, and a first plane on the side of the convex body close to the second mold core 2 is flush with a second plane on the side of the mold slider 11 close to the second mold core 2. And the mold slider 11 has an annular structure, and the inner wall of the mold slider 11 and the outer peripheral surface of the dummy mold fixture 3 are sealed.

[0039] Secondly, the injection material inlet 22 includes a first section perpendicular to the second plane, and a second section perpendicularly communicating with the first section and laterally communicating with 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.

[0040] Through the above structural design, when the mold slider 11 moves, the function of demolding the dummy mold fixture 3 can be achieved, for example.

[0041] It can be understood that in this embodiment, the dummy mold fixture 3 has an inner groove body for the sealing portion 23 to enter. An inner side opening 33 communicating with the first injection molding groove 31 is provided on the inner groove body, and the inner side opening 33 communicates with the first injection molding groove 31. Since the second mold core 2 includes a sealing portion 23 for closing the inner side opening 33 during the injection molding process, and the mold slider 11 is used to close the lateral opening 32 during the injection molding process, the sealing performance of the molding process is ensured during the injection molding process, and the flow and distribution of the injection material can also be precisely controlled, so that the injection material flows in the first injection molding groove 31, thereby improving the quality and consistency of the product.

[0042] Secondly, the injection material inlet 22 is divided into two sections. The first section is perpendicular to the second plane, the second section perpendicularly communicates with the first section, and laterally communicates with the second injection molding groove 21, and the second injection molding groove 21 communicates with the first injection molding groove 31. The injection material inlet 22 ensures that the material can flow along a predetermined path. By the synergistic effect of the sealing portion and the mold slider, the effective control of the injection molding process is realized, so as to ensure that the injection material fills the injection mold cavity and completes the injection molding of the product.

[0043] On the other hand, the present invention also proposes a method for controlling defective products of an injection molding machine. Using the injection mold described above, the method includes the following steps: S1. Set a period from when the injection molding machine is just started up and when the injection molding machine is started up again after being abnormally shut down for a period of time as the injection molding debugging period; S2. During the injection molding debugging cycle, replace the dummy embryo fixture with the injection molding blank. An injection molding cavity is formed between the dummy embryo fixture 3, the first mold core 1, and the second mold core 2. Perform dummy embryo injection molding on the dummy embryo fixture to obtain a dummy embryo injection molded integrated part. S3. At least part of the injection molding cavity provided on the dummy embryo fixture 3 has a draft angle. After performing the dummy embryo injection molding during the injection molding debugging cycle, separate the dummy embryo fixture 3 and the injection molded part of the dummy embryo injection molded integrated part, replace the dummy embryo fixture 3 with the injection molding blank, and perform normal injection molding on the injection molding blank to obtain an injection molding blank integrated part.

[0044] In some embodiments of the present application, 1 - N times of the dummy embryo injection molding are set during the injection molding debugging cycle.

[0045] Specifically, in this embodiment, 1 - 5 times of the dummy embryo injection molding are set during the injection molding debugging cycle. For example, perform 5 times of dummy embryo injection molding.

[0046] In some embodiments of the present application, the period of abnormal shutdown of the injection molding machine is 1 - N minutes.

[0047] Specifically, in this embodiment, the period of abnormal shutdown of the injection molding machine is 1 - 5 minutes. For example, the machine stops for 5 minutes.

[0048] It can be understood that the method for controlling defective products of the injection molding machine in this embodiment has the same beneficial effects as the above injection mold, and will not be elaborated here.

[0049] Those skilled in the art should understand that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0050] The present application is described with reference to the flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or block in the flowchart and / or block diagram can be implemented by computer program instructions, and the combination of processes and / or blocks in the flowchart and / or block diagram can also be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate for implementing in the process Figure 1 a process or multiple processes and / or blocksFigure 1 means for the functions specified in one or more blocks.

[0051] These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to operate in a particular manner, such that the instructions stored in the computer-readable memory produce a manufacture including an instruction means that implements the functions specified in one Figure 1 process or a plurality of processes and / or blocks Figure 1 means for the functions specified in one or more blocks.

[0052] These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus, such that a series of operational steps are performed on the computer or other programmable apparatus to produce a computer-implemented process, whereby the instructions executed on the computer or other programmable apparatus provide steps for implementing the functions specified in one Figure 1 process or a plurality of processes and / or blocks Figure 1 means for the functions specified in one or more blocks.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: the specific implementation manners of the present invention can still be modified or equivalently replaced, and any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered by the protection scope of the claims of the present invention.

Claims

1. An injection mold, comprising a first mold core (1) and a second mold core (2) which are interlocked, wherein the first mold core (1) is detachably connected to an injection molding blank to be injected via a positioning structure, and an injection molding cavity is formed between the injection molding blank, the first mold core (1) and the second mold core (2), characterized in that: A dummy mold jig (3) that imitates the injection molded blank and replaces the injection molded blank is connected in the injection mold cavity via the positioning structure; the injection mold cavity is formed between the dummy mold jig (3), the first mold core (1) and the second mold core (2); at least part of the injection mold cavity is arranged on the dummy mold jig (3), and at least part of the injection mold cavity arranged on the dummy mold jig (3) has a draft angle.

2. The injection mold according to claim 1, characterized in that: The injection mold cavity comprises a first injection molding groove (31) provided on the fake embryo jig, and the first injection molding groove (31) has the draft angle.

3. The injection mold according to claim 2, characterized in that: The first injection molding groove (31) is a tapered groove.

4. The injection mold according to claim 2, characterized in that: The outer peripheral surface of the fake embryo jig (3) is provided with a lateral opening (32) which is in communication with the first injection molding groove (31).

5. The injection mold according to claim 4, characterized in that: The first mold core (1) comprises at least a mold slider (11) that closes the side opening (32).

6. The injection mold according to claim 2, characterized in that: The injection mold cavity () further comprises a second injection molding groove (21) provided 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).

7. The injection mold according to claim 1, characterized in that: The positioning structure comprises a positioning column (12) fixed on the first mold core (1), and positioning holes (34) for inserting the positioning column (12) are respectively provided on the fake embryo fixture (3) and the second mold core (2).

8. A defective product control method for an injection molding machine, using the injection mold according to any one of claims 1 to 7, characterized in that: The method comprises the following steps: S1, setting a period of time between when the injection molding machine is just started and when the injection molding machine is started again after being abnormally stopped for a period of time as the injection molding debugging period; S2, during the injection molding debugging cycle, replacing the injection molding blank with the dummy blank jig (3), forming an injection molding cavity between the dummy blank jig (3), the first mold core (1) and the second mold core (2), and performing dummy blank injection molding on the dummy blank jig (3) to obtain a dummy blank injection molded integrated part; S3, at least part of the injection mold cavity provided on the dummy mold jig (3) has a draft angle, and after the dummy mold is injected during the injection molding debugging cycle, the dummy mold jig (3) and the injection molding part of the dummy mold injection-molded integrated part are separated, and the dummy mold jig (3) is replaced by the injection-molded blank, and normal injection molding is performed on the injection-molded blank, thereby obtaining an injection-molded blank integrated part.

9. The defective product control method for an injection molding machine according to claim 8, characterized in that: The dummy embryo injection molding is set 1-N times within the injection molding debugging cycle.

10. The defective product control method for an injection molding machine according to claim 8, characterized in that: The period of time during which the injection molding machine is abnormally shut down is 1-N minutes.

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