Injection mold

Abstract

The utility model discloses an injection mold and relates to the technical field of in-mold electronics. The injection mold comprises a fixed mold assembly, a movable mold assembly, a positioning structure and an ejector pin structure, and the fixed mold assembly and the movable mold assembly are spliced to form a cavity; the positioning structure comprises a positioning needle and a positioning group plate, and the positioning needle is mounted on the positioning group plate and moves synchronously with the positioning group plate; the movable mold assembly comprises a containing cavity, a first through hole and a containing boss, the positioning assembly plate is installed in the containing cavity, the first through hole communicates with the mold cavity and the containing cavity, the positioning needle penetrates through the first through hole, the containing boss is used for containing a film, the film is provided with a positioning hole, and the top end of the positioning needle is used for penetrating into the positioning hole. The positioning pins synchronously move along with the positioning group plate to change the length of the top ends of the positioning pins extending out of the top surface of the placement boss; the ejector pin structure comprises an ejector pin assembly plate and a firing pin, the firing pin is installed on the ejector pin assembly plate and moves synchronously with the ejector pin assembly plate, and the firing pin is used for jacking the positioning assembly plate. The scheme is beneficial to accurate positioning of the film and improves the quality of injection molding finished products.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of in-mold electronics technology, especially to an injection mold. BACKGROUND

[0002] In-mold electronics (IME) technology is widely used in medical, automotive and household appliance fields, which can integrate electrical functions on flexible film through printing and surface mounting process to prepare functional film, and then make products through in-mold coating process. In the process of making the film and plastic material into products, the flexible film may be offset when put into the injection mold, which leads to the difficulty in ensuring the quality of the injection product, because the flexible film has a certain flexibility and the size is too small, and it is difficult to design a special positioning clamp or positioning protrusion in the injection space to accurately position the flexible film.

[0003] Therefore, it is necessary to provide an injection mold to solve or at least alleviate the above technical problems. SUMMARY

[0004] The main purpose of the utility model is to provide an injection mold, which aims to solve the technical problem that the flexible film is difficult to be accurately put into the injection mold, leading to the difficulty in ensuring the quality of the injection product.

[0005] To achieve the above purpose, the utility model provides an injection mold, which comprises:

[0006] a fixed mold assembly;

[0007] a movable mold assembly, the fixed mold assembly and the movable mold assembly are combined to form a cavity;

[0008] a positioning structure, the positioning structure comprises a positioning needle and a positioning plate, the positioning needle is installed on the positioning plate and moves synchronously with the positioning plate;

[0009] The movable mold assembly comprises a receiving cavity, a first through hole and a placing boss, the positioning plate is installed in the receiving cavity, the first through hole communicates the cavity and the receiving cavity, the positioning needle is arranged in the first through hole, the placing boss is used for placing a film, the film is provided with a positioning hole, the top end of the positioning needle is used for penetrating into the positioning hole, and the positioning needle moves synchronously with the positioning plate to change the length of the top end of the positioning needle extending out of the top surface of the placing boss;

[0010] a thimble structure, the thimble structure comprises a thimble plate and a striker, the striker is installed on the thimble plate and moves synchronously with the thimble plate, and the striker is used for lifting the positioning plate.

[0011] In an embodiment, the positioning plate comprises a first position and a second position.

[0012] When the positioning assembly is in the first position, the bottom surface of the positioning assembly is arranged in abutment with the bottom wall of the accommodating cavity, and the top end of the positioning needle is located in the positioning hole;

[0013] When the positioning assembly is in the second position, the top surface of the positioning assembly is arranged in abutment with the top wall of the accommodating cavity, and the top end of the positioning needle protrudes from the top surface of the film.

[0014] In an embodiment, the positioning structure further comprises a return rod, the movable die assembly further comprises a second through hole, the bottom end of the return rod is connected with the positioning assembly, the return rod is arranged in the second through hole, and the return rod moves synchronously with the positioning assembly;

[0015] When the positioning assembly is in the second position, the top end of the return rod protrudes from the second through hole;

[0016] When the fixed die assembly and the movable die assembly are spliced and clamped, the fixed die assembly pushes the top end of the return rod to retreat into the second through hole, and the positioning assembly retreats to the first position.

[0017] In an embodiment, the positioning structure further comprises a compression spring and a rubber plug, the movable die assembly is provided with a first blind hole and a second blind hole which are in communication with the accommodating cavity, and the first blind hole and the second blind hole are arranged on the side of the accommodating cavity away from the cavity;

[0018] The compression spring is arranged in the first blind hole, and the top end of the compression spring is arranged in abutment with the positioning assembly;

[0019] The top end of the rubber plug is mounted on the positioning assembly, the rubber plug moves synchronously with the positioning assembly, and the rubber plug is in interference fit with the second blind hole;

[0020] When the positioning assembly is in the first position, the frictional force between the rubber plug and the second blind hole is greater than the elastic force applied by the compression spring to the positioning assembly.

[0021] In an embodiment, the ejector pin assembly is arranged on the side of the movable die assembly away from the fixed die assembly, the movable die assembly is further provided with a lifting through hole, and the ejector pin is arranged in the lifting through hole;

[0022] Definition: When the positioning assembly is in the first position, the distance between the top surface of the ejector pin assembly and the bottom surface of the movable die assembly is L, the distance between the top surface of the positioning assembly and the top wall of the accommodating cavity is L1, and the distance between the top end of the ejector pin and the positioning assembly is L2;

[0023] The L, L1 and L2 satisfy: L = L1 + L2.

[0024] In an embodiment, the movable mold assembly further comprises a side pressing insert, the movable mold assembly is provided with an insert insertion hole, the insert insertion hole is communicated with the cavity, and the side pressing insert is used for being inserted into the insert insertion hole.

[0025] The thin film further comprises a bending part and excess gap parts arranged on both sides of the bending part, when the side pressing insert is installed, the side pressing insert passes through the excess gap parts and is inserted into the insert insertion hole to press the bending part.

[0026] The top of the side pressing insert is provided with a positioning protrusion, after the side pressing insert is inserted into the insert insertion hole, the positioning protrusion abuts against the bending part.

[0027] Definition: the direction from one excess gap part to the other excess gap part is a first direction.

[0028] In the first direction, the size of the positioning protrusion is smaller than the size of the bending part.

[0029] In an embodiment, the ejector pin structure further comprises an insert ejector pin, the bottom end of the insert ejector pin is installed on the ejector pin group plate, the top end of the insert ejector pin abuts against the side pressing insert through the movable mold assembly and the positioning group plate, and the insert ejector pin is used for ejecting the side pressing insert.

[0030] In an embodiment, the placing boss comprises a placing part and a flange, the placing part is used for placing the thin film, the flange is arranged along the circumference of the placing part, and the size of the flange along the thickness direction of the thin film is greater than the thickness of the thin film.

[0031] In an embodiment, the fixed mold assembly is provided with a main runner, the fixed mold assembly and the movable mold assembly are combined to form the cavity and a glue guiding cavity, and the main runner, the glue guiding cavity and the cavity are communicated in sequence.

[0032] In an embodiment, the ejector pin structure further comprises a nozzle ejector pin, an article ejector pin and a supporting piece, the bottom end of the nozzle ejector pin is installed on the ejector pin group plate, the top end of the nozzle ejector pin passes through the movable mold assembly and the positioning group plate and extends into the glue guiding cavity.

[0033] The supporting piece is arranged in close contact with the bottom surface of the thin film, the bottom end of the article ejector pin is installed on the ejector pin group plate, and the top end of the article ejector pin passes through the movable mold assembly and the positioning group plate and is connected with the supporting piece.

[0034] The nozzle ejector pin and the article ejector pin move synchronously with the ejector pin group plate.

[0035] In the technical scheme provided by the utility model, the injection mold comprises a fixed mold assembly, a movable mold assembly, a positioning structure and a ejector pin structure, wherein the fixed mold assembly and the movable mold assembly are combined to form a cavity; the positioning structure comprises a positioning pin and a positioning plate, the positioning pin is installed on the positioning plate and moves synchronously with the positioning plate; the movable mold assembly comprises a receiving cavity, a first through hole and a placing boss, the positioning plate is installed on the receiving cavity, the first through hole is connected with the cavity and the receiving cavity, the positioning pin is arranged in the first through hole, the placing boss is used for placing a film, the film is provided with a positioning hole, the top end of the positioning pin is used for penetrating into the positioning hole, and the positioning pin moves synchronously with the positioning plate to change the length of the top end of the positioning pin extending out of the top surface of the placing boss; the ejector pin structure comprises an ejector pin plate and a striker, the striker is installed on the ejector pin plate and moves synchronously with the ejector pin plate, and the striker is used for lifting the positioning plate. Through the arrangement, the positioning plate can drive the positioning pin to lift, after the injection mold is opened, the ejector pin plate drives the striker to lift the positioning plate, the positioning pin rises with the positioning plate, so that the top end of the positioning pin rises, at this time, the positioning hole of the film is matched with the positioning pin, so that the film can be positioned accurately, when the mold is closed, the positioning plate is restored to drive the positioning pin to descend, so that the hole structure is not formed in the injection shell during injection. Therefore, through the technical scheme provided by the utility model, the film can be accurately placed in the injection mold, so that the placement position of the film is not deviated, and the hole is not formed in the injection shell, thereby ensuring the quality of the injection product. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained from the structure shown in these drawings without creative labor.

[0037] Figure 1 The structure schematic diagram of the injection product produced by the injection mold one embodiment provided by the utility model;

[0038] Figure 2 The structure schematic diagram of the injection mold one embodiment provided by the utility model;

[0039] Figure 3 The structure schematic diagram of another section of the injection mold one embodiment provided by the utility model;

[0040] Figure 4 The structure schematic diagram of another section of the injection mold one embodiment provided by the utility model; Figure 2 The partial section structure schematic diagram of the injection mold provided by the utility model when opening;

[0041] Figure 5 The structure schematic diagram of another section of the injection mold provided by the utility model when opening; Figure 3A partial sectional structure schematic view of the injection mold provided in the embodiment is shown in the figure;

[0042] Figure 6 A partial sectional structure schematic view of the injection mold provided in the embodiment is shown in the figure; Figure 5 A partial sectional structure schematic view of the injection mold provided in the embodiment is shown in the figure;

[0043] Figure 7 A partial sectional structure schematic view of the injection mold provided in the embodiment is shown in the figure; Figure 5 A partial sectional structure schematic view of the injection mold provided in the embodiment is shown in the figure;

[0044] Figure 8 A partial sectional structure schematic view of the injection mold provided in the embodiment is shown in the figure;

[0045] Figure 9 A partial sectional structure schematic view of the injection mold provided in the embodiment is shown in the figure;

[0046] Figure 10 A partial sectional structure schematic view of the injection mold provided in the embodiment is shown in the figure;

[0047] Figure 11 A partial sectional structure schematic view of the injection mold provided in the embodiment is shown in the figure; Figure 10 A partial sectional structure schematic view of the injection mold provided in the embodiment is shown in the figure.

[0048] Explanation of the reference numerals:

[0049] 1000, injection mold;

[0050] 1, fixed mold assembly; 11, fixed mold plate; 12, fixed mold core; 13, fixed mold seat; 14, main runner;

[0051] 2, movable mold assembly; 21, movable mold plate; 211, accommodating cavity; 212, lifting through hole; 213, first blind hole; 214, second blind hole; 22, movable mold core; 221, placing boss; 2211, flange; 222, insert insertion hole; 23, movable mold seat; 24, edge pressing insert; 241, positioning protrusion; 25, cushion block;

[0052] 3, positioning structure; 31, positioning group plate; 311, positioning bottom plate; 312, positioning face plate; 32, positioning needle; 33, return rod; 34, compression spring; 35, rubber plug;

[0053] 4, thimble structure; 41, thimble group plate; 411, thimble bottom plate; 412, thimble face plate; 42, striker; 43, insert thimble; 44, nozzle thimble; 45, product thimble; 46, supporting piece;

[0054] 5, cavity;

[0055] 6, glue guiding cavity;

[0056] 2000, injection molding finished product; 2010, film; 2011, positioning hole; 2012, bending part; 2013, over-position gap; 2020, injection molding shell; 2021, reinforcing part; 2022, missing slot; X, first direction;

[0057] F, peak before the flow of glue.

[0058] The purposes, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0059] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work belong to the scope of protection of the present application.

[0060] It should be noted that if the present application embodiments involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship, movement condition, etc. between the components in a certain posture, and if the certain posture changes, the directional indications will also change accordingly.

[0061] In addition, if the present application embodiments involve descriptions of "first", "second", etc., the descriptions of "first", "second", etc. are only for description purposes, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features with "first" and "second" can explicitly or implicitly include at least one of the features. In addition, "and / or" or "and / or" appearing throughout the text means that the three parallel schemes are included, for example, "A and / or B" includes A scheme, or B scheme, or A and B simultaneously satisfy the scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of the ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor is it within the scope of protection required by the present application.

[0062] With the progress of manufacturing technology, the user experience requires product design more and more simple, light and thin, safe and stable. In the traditional product design, the circuit module is usually etched on the PCB board, and then assembled and connected with the formed plastic shell. However, this design often makes the product internal space large, the space compression limited, and the assembly process long and high cost. In order to overcome the defects of traditional product design, in-mold electronics (IME) technology gradually rises. The in-mold electronics technology is a combination of traditional in-mold decoration (IMD) technology and flexible printed circuit technology. It is plated with conductive copper sheet on the flexible film, etched into the product design circuit, and welded with electronic components to form a flexible functional film. Then, the circuit is integrated into the product through injection molding. This technology can greatly compress the internal space of the product, simplify the product assembly process and functional parts. The process mainly includes: (1) printing a decorative layer on the film; (2) manufacturing circuits, sensors and the like on the film; (3) mounting electronic components on the surface of the film; (4) film hot pressing / high pressure forming; (5) film and plastic material injection molding into a part. Among them, process (6) needs to use injection mold to complete with injection molding machine.

[0063] However, according to the applicant's research, for some small size products, the film is light in weight and small in size, and the corresponding injection molding product is also small in size. Therefore, when designing the injection mold, the size of the cavity for forming the injection molding shell should not be too large, and the injection molding shell should not form a hole. In order to ensure the integrity of the injection molding shell, it is difficult to design a special positioning clamp or positioning protrusion in the cavity to precisely position the film. Therefore, the film may be offset when placed in the injection mold, which may affect the quality of the injection molding product.

[0064] In view of this, the utility model provides an injection mold to solve the above technical problems.

[0065] Please refer to Figures 1 to 7In the embodiment of the utility model, the injection mold 1000 includes a fixed mold assembly 1, a movable mold assembly 2, a positioning structure 3 and a ejector pin structure 4, wherein the fixed mold assembly 1 and the movable mold assembly 2 are combined to form a cavity 5; the positioning structure includes a positioning pin 32 and a positioning plate 31, the positioning pin 32 is installed on the positioning plate 31 and moves synchronously with the positioning plate 31; the movable mold assembly 2 includes a receiving cavity 211, a first through hole and a placing boss 221, the positioning plate 31 is installed on the receiving cavity 211, the first through hole is communicated with the cavity 5 and the receiving cavity 211, the positioning pin 32 is arranged in the first through hole, the placing boss 221 is used for placing a film 2010, the film 2010 is provided with a positioning hole 2011, the top end of the positioning pin 32 is used for penetrating into the positioning hole 2011, the positioning pin 32 moves synchronously with the positioning plate 31 to change the length of the top end of the positioning pin 32 extending out of the top surface of the placing boss 221; the ejector pin structure 4 includes an ejector pin plate 41 and a striker 42, the striker 42 is installed on the ejector pin plate 41 and moves synchronously with the ejector pin plate 41, and the striker 42 is used for lifting the positioning plate 31.

[0066] Specifically, the fixed mold assembly 1 includes a fixed mold plate 11, a fixed mold core 12 and a fixed mold seat 13, the fixed mold plate 11 is threadedly connected with the fixed mold seat 13, the fixed mold seat 13 is used for being installed at a corresponding position of an injection molding machine, the fixed mold core 12 is connected with the fixed mold plate 11 in a detachable connection manner such as threaded connection or clamping connection, and technicians can select fixed mold cores 12 of different models to be installed in the fixed mold plate 11 according to different models of injection molding products 2000. The movable mold assembly 2 includes a movable mold plate 21, a movable mold core 22 and a movable mold seat 23, and the movable mold assembly 2 can move with a mold closing system on the injection molding machine during the injection molding process. The movable mold plate 21 and the movable mold seat 23 are threadedly connected, the movable mold seat 23 is used for being installed on a mold closing movement structure on the injection molding machine, and the movable mold plate 21 and the movable mold core 22 are also connected in a detachable connection manner such as threaded connection or clamping connection. When the fixed mold core 12 needs to be replaced by a different model, the movable mold core 22 also needs to be replaced by a different model, so that the movable mold core 22 and the fixed mold core 12 cooperate with each other to form a mold cavity 5, and the mold cavity 5 is used for defining the shape of the injection molded shell 2020. The positioning group plate 31 includes a positioning bottom plate 311 and a positioning face plate 312, the positioning bottom plate 311 and the positioning face plate 312 are threadedly connected, the positioning needle 32 can be conveniently replaced by detaching the positioning face plate 312. The ejector group plate 41 includes an ejector bottom plate 411 and an ejector face plate 412, the ejector needle 42 can be conveniently replaced by detaching the ejector face plate 412. The accommodating cavity 211 is opened in the movable mold plate 21, a top wall of the accommodating cavity 211 is a bottom surface of the movable mold core 22, the positioning bottom plate 311 can drive the positioning face plate 312 to move up and down in the accommodating cavity 211, thereby driving the positioning needle 32 to move. The first through hole and the placing boss 221 are both arranged on the movable mold core 22, the positioning needle 32 passes through the first through hole and protrudes out of the placing boss 221. When the injection mold 1000 is opened, the film 2010 needs to be placed, the ejector bottom plate 411 moves towards the fixed mold core 12 under the pushing of the driving rod of the injection molding machine, thereby driving the ejector needle 42 to move towards the positioning bottom plate 311 and driving the positioning bottom plate 311 to move towards the fixed mold core 12, thereby driving the positioning needle 32 to rise, increasing the distance between the top end of the positioning needle 32 and the placing boss 221, thereby facilitating the positioning hole 2011 of the film 2010 to be sleeved on the positioning needle 32; when the injection mold 1000 is closed, the positioning bottom plate 311 retreats to the initial position, so that the top end of the positioning needle 32 does not protrude from the top surface of the film 2010, thereby ensuring that no hole is formed in the injection molded shell 2020 after the injection molding is completed, and ensuring the integrity of the injection molded shell 2020. In addition, the positioning group plate 31 can only move in the accommodating cavity 211, the positioning group plate 31 and the ejector group plate 41 only contact through the ejector needle 42, by changing the length of the ejector needle 42 and the thickness of the positioning group plate 31 (the thickness of the positioning group plate 31 is changed by changing the model of the positioning face plate 312), the distance that the top end of the positioning needle 32 protrudes out of the placing boss 221 can be adjusted, and the length that the top end of the positioning needle 32 protrudes out is prevented from being too small or too large, thereby preventing workers from easily placing the film 2010.

[0067] In the embodiment, the positioning group plate 31 can drive the positioning needle 32 to ascend by adopting the scheme that the positioning structure 3 and the ejector pin structure 4 cooperate with each other. After the injection mold 1000 is opened, the ejector pin group plate 41 drives the ejector pin 42 to lift the positioning group plate 31, so that the positioning needle 32 rises with the positioning group plate 31, thereby the top end of the positioning needle 32 rises. At this time, the positioning hole 2011 of the film 2010 is matched with the positioning needle 32, so that the accurate positioning of the film 2010 is realized. When the mold is closed, the positioning group plate 31 is restored, and the positioning needle 32 is driven to descend, so that the hole structure is avoided to be formed in the inside of the injection molded shell 2020. Therefore, by the technical scheme provided in the embodiment, the film 2010 can be accurately placed in the injection mold 1000, so that the deviation of the placement position of the film 2010 is avoided, and the hole is not formed in the inside of the injection molded shell 2020, thereby the quality of the injection molded product 2000 is ensured.

[0068] In an embodiment of the utility model, the positioning group plate 31 includes a first position and a second position. When the positioning group plate 31 is at the first position, the bottom surface of the positioning group plate 31 is arranged in abutment with the bottom wall of the accommodating cavity 211, and the top end of the positioning needle 32 is located in the positioning hole 2011. When the positioning group plate 31 is at the second position, the top surface of the positioning group plate 31 is arranged in abutment with the top wall of the accommodating cavity 211, and the top end of the positioning needle 32 protrudes from the top surface of the film 2010. Please refer to Figure 3 、 Figure 5 With Figure 7 After the injection mold 1000 is closed, the plastic material flows into the cavity 5 to form the injection molded shell 2020. During this process, the positioning group plate 31 is at the first position, and the top end of the positioning needle 32 is below the top surface of the film 2010. At this time, the positioning needle 32 will not cause the hole to be formed in the injection molded shell 2020. After the injection is completed, please refer to Figure 5 The ejector pin group plate 41 drives the ejector pin 42 to ascend, so that the ejector pin 42 pushes the positioning group plate 31 to ascend into the second position. At this time, the distance that the positioning needle 32 protrudes from the surface of the placement boss 221 is large, so that the worker or the robot can easily identify the placement position and the placement direction of the film 2010, thereby the positioning hole 2011 on the film 2010 can be accurately matched with the positioning needle 32, and the accuracy of the placement of the film 2010 is ensured. After the film 2010 is placed, the injection mold 1000 is closed, and the positioning group plate 31 is reset to the first position, thereby the positioning needle 32 is driven to descend, so that the top end of the positioning needle 32 is below the top surface of the film 2010.

[0069] Further, in the embodiment of the utility model, the positioning structure 3 further includes a return rod 33, the movable mold assembly 2 further includes a second through hole, the bottom end of the return rod 33 is connected with the positioning group plate 31, the return rod 33 is arranged in the second through hole, the return rod 33 moves synchronously with the positioning group plate 31;When the positioning group plate 31 is in the second position, the top end of the return rod 33 extends out of the second through hole;When the fixed mold assembly 1 and the movable mold assembly 2 are spliced and molded, the fixed mold assembly 1 pushes the top end of the return rod 33 to retreat into the second through hole, and the positioning group plate 31 retreats to the first position. Figure 2 With Figure 4 In the embodiment, the cavity 5 is provided with at least two, and two positioning needles 32 are arranged on each side of the cavity 5, corresponding to the two positioning holes 2011 on the film 2010. The return rod 33 is installed on the positioning group plate 31, and the return rod 33 can be removed by disassembling the positioning panel 312, so as to replace the return rod 33. The second through hole is arranged in the movable mold core 22, and the return rod 33 is arranged in the second through hole. When the injection mold 1000 is opened, the ejector group plate 41 drives the ejector pin 42 to push the positioning group plate 31 to move, so that the positioning group plate 31 enters the second position from the first position, and at this time, the top end of the return rod 33 extends out of the top surface of the movable mold core 22. When the mold is closed, the top end of the return rod 33 is in contact with the fixed mold core 12, and under the action of the pushing force applied by the fixed mold core 12 to the return rod 33, the return rod 33 gradually moves towards the direction of the ejector group plate 41, thereby driving the positioning group plate 31 to retreat to the first position, at this time, the top end of the return rod 33 retreats to the top of the second through hole, avoiding that a larger gap is generated at the junction of the fixed mold core 12 and the movable mold core 22, affecting the flow of plastic material. Through this arrangement, the return process of the positioning group plate 31 can be completed without setting up an electric component, and the structure is simple and the cost is low.

[0070] Further, please refer to Figures 2 to 5In the embodiment of the utility model, the positioning structure 3 further includes compression spring 34 and rubber plug 35, the movable die assembly 2 is provided with first blind hole 213 and second blind hole 214 in communication with the accommodating cavity 211, and the first blind hole 213 and the second blind hole 214 are arranged on the side of the accommodating cavity 211 away from the cavity 5;The compression spring 34 is arranged in the first blind hole 213, and the top end of the compression spring 34 is attached to the positioning group board 31;The top end of the rubber plug 35 is installed on the positioning group board 31, the rubber plug 35 moves synchronously with the positioning group board 31, and the rubber plug 35 is in interference fit with the second blind hole 214;When the positioning group board 31 is in the first position, the friction between the rubber plug 35 and the second blind hole 214 is greater than the elastic force of the compression spring 34 applied to the positioning group board 31. Among them, the rubber plug 35 includes one of nylon rubber plug and rubber rubber plug, and nylon rubber plug is used in the embodiment. The compression spring 34 is used to provide the elastic force to the positioning group board 31. Through the setting, when the injection mold 1000 is opened, the positioning group board 31 is driven by the plunger 42 to enter the second position from the first position, and at this time, due to the elastic force of the compression spring 34, the positioning group board 31 can be stably kept in the second position, so that the positioning needle 32 can stably keep the length of the extension of the placing boss 221, and the film 2010 is accurately placed. When the mold is closed, the die core 12 drives the return rod 33 to drive the positioning group board 31 to retreat to the first position, and at this time, due to the friction between the rubber plug 35 and the second blind hole 214 being greater than the elastic force of the compression spring 34, the positioning group board 31 can be kept in the first position, avoiding movement during the injection molding process, and affecting the quality of the injection molding product 2000.

[0071] In the embodiment of the utility model, the ejector group board 41 is arranged on the side of the movable die assembly 2 away from the fixed die assembly 1, the movable die assembly 2 is further provided with a lift-through hole 212, and the plunger 42 is arranged in the lift-through hole 212;Definition: when the positioning group board 31 is in the first position, the distance between the top surface of the ejector group board 41 and the bottom surface of the movable die assembly 2 is L, the distance between the top surface of the positioning group board 31 and the top wall of the accommodating cavity 211 is L1, and the distance between the top end of the ejector and the positioning group board 31 is L2;Among them, L, L1 and L2 satisfy: L=L1+L2. Through the setting, after the ejector group board 41 is lifted by L distance each time, the positioning group board 31 can accurately move by L1 distance, so as to drive the positioning needle 32 and the return rod 33 to move by L1 distance. Through the cooperation, the distance between the first position and the second position of the positioning group board 31 is L1, without additional limiting structure or movement detection mechanism, the positioning group board 31 can be ensured to be accurately positioned each time. In addition, the spacer 25 is arranged between the movable die seat 23 and the movable die plate 21, the spacer 25 is used to adjust the distance between the movable die seat 23 and the movable die plate 21, so as to adjust the distance between the ejector face plate 412 and the bottom surface of the movable die plate 21, so that L satisfies L=L1+L2.

[0072] In an embodiment of the utility model, the movable die assembly 2 further includes a rim pressing insert 24, the movable die assembly 2 is provided with an insert insertion hole 222, the insert insertion hole 222 is communicated with the cavity 5, and the rim pressing insert 24 is used for being inserted into the insert insertion hole 222;The film 2010 further includes a bending part 2012 and an over-limit gap 2013 arranged on both sides of the bending part 2012, when the rim pressing insert 24 is installed, the rim pressing insert 24 is inserted into the insert insertion hole 222 through the over-limit gap 2013 to press the bending part 2012;The top of the rim pressing insert 24 is provided with a positioning protrusion 241, after the rim pressing insert 24 is inserted into the insert insertion hole 222, the positioning protrusion 241 is abutted with the bending part 2012;Definition: the direction from one side over-limit gap 2013 to the other side over-limit gap 2013 is the first direction X;Along the first direction X, the size of the positioning protrusion 241 is less than the size of the bending part 2012. Figure 1 Due to design requirements, the film 2010 needs to be provided with the bending part 2012, and the film 2010 has a certain elasticity, after the bending part 2012 is bent by manual or robot, there is a certain rebound amount, and the rebound amount is random and difficult to control, so that the bending effect of the bending part is difficult to guarantee. Figure 2 、 Figure 4 、 Figure 8 With Figure 9 In the embodiment, the rim pressing insert 24 and the insert insertion hole 222 matched with the rim pressing insert 24 are arranged, the insert insertion hole 222 is arranged in the movable die core 22, after the film 2010 is placed on the placing boss 221, the rim pressing insert 24 is inserted into the insert insertion hole 222 by manual or robot, during the insertion process, because the over-limit gap 2013 exists on both sides of the bending part 2012, the bending part 2012 forms a cantilever structure, so that the bending part 2012 can be pressed and bent during the process that the rim pressing insert 24 is inserted into the insert insertion hole 222, and the existence of the over-limit gap 2013 allows the rim pressing insert 24 to be inserted into the insert insertion hole 222 through the film 2010. The positioning protrusion 241 at the top of the rim pressing insert 24 is used for pressing the bending part 2012 tightly on the placing boss 221, so that the bending part 2012 can be attached to the arc of the placing boss 221, thereby ensuring that the bending part 2012 does not rebound during the injection molding process. Figure 1, the first direction X is same with the length direction of the injection product 2000, since the length of the bending part 2012 along the first direction X is greater than the length of the positioning protrusion 241, therefore, after the injection is completed, the part corresponding to the positioning protrusion 241 forms a slot 2022, and the parts on both sides of the slot 2022 along the first direction X are filled with plastic material to form a reinforcing part 2021, through the setting, after the injection is completed, the bending part 2012 can continuously bear the external force from the reinforcing part 2021, so that the bending part 2012 can continuously maintain the designed bending state without rebounding.

[0073] Please continue to refer to Figure 2 、 Figure 4 、 Figure 8 and Figure 9 In the embodiment, in order to facilitate the extraction of the edge insert 24, the ejector pin structure 4 further comprises an insert ejector pin 43, the bottom end of the insert ejector pin 43 is installed on the ejector pin group plate 41, the top end of the insert ejector pin 43 abuts against the edge insert 24 through the movable mold assembly 2 and the positioning group plate 31, and the insert ejector pin 43 is used for ejecting the edge insert 24. Specifically, the insert ejector pin 43 passes through the movable mold core 22, the positioning bottom plate 311, the positioning face plate 312 and the movable mold core 22 in sequence through the ejector pin group plate 41, and finally abuts against the edge insert 24. When the mold is opened, the ejector pin bottom plate 411 drives the ejector pin face plate 412 to move towards the movable mold core 22, thereby driving the insert ejector pin 43 to rise, and then the edge insert 24 is ejected through the insert ejector pin 43, so that the edge insert 24 does not need to be manually or robotically extracted, and the extraction efficiency of the edge insert 24 is higher.

[0074] In an embodiment of the utility model, the placing boss 221 includes a placing position for placing the film 2010, and the placing boss 221 further includes a flange 2211 arranged along the circumference of the placing position, and the dimension of the flange 2211 along the thickness direction of the film 2010 is greater than the thickness of the film 2010. Figure 10 and Figure 11, the plastic material in a fluid state flows into the cavity 5, the front end of the plastic material flow direction becomes the glue flow front peak F, the glue flow front peak F has a certain force on the film 2010, because the film 2010 has flexibility, the glue flow front peak F and the film 2010 edge may cause the edge of the film 2010 to curl or shift, therefore, in the embodiment, a flange 2211 is arranged around the film 2010, which is used to avoid the situation that the glue flow front peak F directly collides with the edge of the film 2010, so that the glue flow front peak F is driven by the flange 2211 to flow to the inside of the edge of the film 2010, thereby avoiding disturbance to the edge of the film 2010, and further ensuring the quality of the injection molding product 2000. It should be noted that the thickness of the film 2010 is t, and the thickness of the flange 2211 is h, in order to make the glue flow front peak F pass through the flange 2211 without contacting the edge of the film 2010, h>t needs to be met.

[0075] In an embodiment of the utility model, the fixed mold assembly 1 is provided with a main runner 14, the fixed mold assembly 1 and the movable mold assembly 2 are spliced to form a cavity 5 and a glue guide cavity 6, and the main runner 14, the glue guide cavity 6 and the cavity 5 are sequentially communicated. Please refer to Figure 3 And Figure 10 The plastic material flows into the glue guide cavity 6 through the main runner 14 and flows to both sides of the glue guide cavity 6, and finally flows into the cavities 5 on both sides of the glue guide cavity 6. Among them, the cavities 5 can be symmetrically arranged on both sides of one glue guide cavity 6, and the plastic material in the glue guide cavity 6 flows uniformly into the plurality of cavities 5 to improve the production efficiency of the injection molding product 2000.

[0076] In addition, in an embodiment of the utility model, the ejector pin structure 4 further includes a sprue ejector pin 44, a product ejector pin 45 and a supporting piece 46, the bottom end of the sprue ejector pin 44 is installed on the ejector pin group plate 41, the top end of the sprue ejector pin 44 penetrates through the movable mold assembly 2 and the positioning group plate 31 and extends into the glue guide cavity 6; the supporting piece 46 is arranged in close contact with the bottom surface of the film 2010, the bottom end of the product ejector pin 45 is installed on the ejector pin group plate 41, the top end of the product ejector pin 45 penetrates through the movable mold assembly 2 and the positioning group plate 31 and is connected with the supporting piece 46; the sprue ejector pin 44 and the product ejector pin 45 move synchronously with the ejector pin group plate 41. Please refer to Figure 5 And Figure 6The sprue pin 44 is used to eject the solidified plastic material in the glue guide cavity 6 and the main runner 14, and the product pin 45 is used to eject the injection molded product 2000 in the cavity 5. The product pin 45 is provided with a supporting piece 46 at the top end to increase the contact area between the product pin 45 and the injection molded product 2000, thereby improving the stability of the ejection process. The sprue pin 44 passes through the movable die plate 21, the first blind hole 213, the positioning bottom plate 311, the positioning face plate 312 and the movable die core 22 in sequence to enter the glue guide cavity 6, and the product pin 45 passes through the movable die plate 21, the positioning bottom plate 311, the positioning face plate 312 and the movable die core 22 in sequence to enter the cavity 5. Through this arrangement, the injection molded product 2000 and the solidified plastic material in the glue guide cavity 6 and the main runner 14 can be ejected by pushing the pin bottom plate 411 upward through the driving rod of the injection molding machine. The overall structure is simple, reliable, and conducive to improving the production efficiency of the injection molded product 2000.

[0077] According to the above embodiment, the working process of the injection mold 1000 provided in the embodiment is as follows:

[0078] (1) After the injection is completed, the injection mold 1000 is opened. The movable die assembly 2 and the fixed die assembly 1 are separated, so that the injection molded product 2000 is exposed to the outside world.

[0079] (2) The injection molded product 2000 is ejected. The pin bottom plate 411 is driven by the driving rod of the injection molding machine to drive the pin face plate 412 to rise, thereby driving the sprue pin 44, the product pin 45, the insert pin 43 and the striker 42 to move upward synchronously. The sprue pin 44 ejects the solidified plastic material in the glue guide cavity 6 and the main runner 14, the product pin 45 ejects the injection molded product 2000, the insert pin 43 ejects the edge pressing insert 24, and the ejected product or the edge pressing insert 24 is taken down by a robot or manually. The striker 42 moves upward by a length L, and drives the positioning bottom plate 311 and the positioning face plate 312 to move upward by a length L1, so that the positioning needle 32 and the return rod 33 move with the positioning bottom plate 311 by the length L1.

[0080] (3) The pin structure 4 is retracted. A spring is arranged between the movable die plate 21 and the pin face plate 412. After the driving rod of the injection molding machine is retracted, the pin face plate 412 and the pin bottom plate 411 are retracted under the action of the spring, thereby driving the sprue pin 44, the product pin 45, the insert pin 43 and the striker 42 to retract to the initial position. The positioning bottom plate 311 can be kept at the second position due to the compression spring 34 arranged at the bottom of the positioning bottom plate 311, so that the positioning needle 32 and the return rod 33 protrude from the top surface of the movable die core 22.

[0081] (4) Install the film 2010. Use manual or robot to align the positioning hole 2011 of the film 2010 with the positioning needle 32 of the injection mold 1000, and place the film 2010 on the placement position of the placement boss 221.

[0082] (5) Install the edge pressing insert 24. Use manual or robot to insert the edge pressing insert 24 into the insert hole 222.

[0083] (6) Close the injection mold 1000, and retract the positioning structure 3. Gradually close the movable mold assembly 2 with the movable mold assembly 2, and push the positioning rod 33 down by the positioning block 12, so that the positioning bottom plate 311 and the positioning face plate 312 are lowered to the first position, thereby driving the positioning needle 32 to retract to the initial position. After the positioning bottom plate 311 is retracted to the first position, the friction force between the rubber plug 35 and the second blind hole 214 is greater than the elastic force of the compression spring 34, so that the positioning bottom plate 311 is kept at the first position, avoiding the positioning needle 32 from being suddenly pushed out, causing the injection product 2000 to have top printing or holes.

[0084] (7) Injection and cooling. Continuously feed the plastic material in a flowing state to the main runner 14, so that the plastic material enters the cavity 5 through the glue guide cavity 6, and after the injection is completed, the injection shell 2020 is cooled and formed.

[0085] After the process (7) is completed, the process (1) is performed, and the cycle is repeated, so that the injection product 2000 can be continuously produced.

[0086] The above is only an exemplary embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structural transformation or direct / indirect application in other related technical fields under the technical concept of the present application is included in the patent protection scope of the present application.

Claims

1. An injection mold characterized in that, The utility model relates to a kind of positioning structure and top pin structure of injection molding machine, including: Fixed die assembly; Movable die assembly, the fixed die assembly and the movable die assembly split to form cavity; Positioning structure, the positioning structure includes positioning needle and positioning group board, the positioning needle is installed in the positioning group board and synchronous motion with the positioning group board; The movable die assembly includes accommodating cavity, first through-hole and placement boss, the positioning group board is installed in the accommodating cavity, the first through-hole is communicated the cavity and the accommodating cavity, the positioning needle is arranged in the first through-hole, the placement boss is used to place film, the film is provided with positioning hole, the top end of the positioning needle is used to penetrate into the positioning hole, the positioning needle synchronous motion with the positioning group board to change the length of the top end of the positioning needle protruding from the top surface of the placement boss; Top pin structure, the top pin structure includes top pin group board and hammer, the hammer is installed in the top pin group board and synchronous motion with the top pin group board, and the hammer is used to lift the positioning group board.

2. The injection mold of claim 1, wherein, The positioning group board includes first position and second position; When the positioning group board is in the first position, the bottom surface of the positioning group board is arranged in close contact with the bottom wall of the accommodating cavity, and the top end of the positioning needle is located in the positioning hole. When the positioning group board is in the second position, the top surface of the positioning group board is arranged in close contact with the top wall of the accommodating cavity, and the top end of the positioning needle protrudes from the top surface of the film.

3. The injection mold of claim 2, wherein, The positioning structure further includes a return rod, and the movable die assembly further includes a second through-hole, the bottom end of the return rod is connected with the positioning group board, the return rod is arranged in the second through-hole, and the return rod is synchronous with the positioning group board. When the positioning group board is in the second position, the top end of the return rod protrudes from the second through-hole. When the fixed die assembly and the movable die assembly are spliced, the top end of the return rod is pushed into the second through-hole by the fixed die assembly, and the positioning group board is returned to the first position.

4. The injection mold of claim 3, wherein The positioning structure further includes a compression spring and a rubber plug, the movable die assembly is provided with a first blind hole and a second blind hole communicated with the accommodating cavity, the first blind hole and the second blind hole are arranged on the side of the accommodating cavity away from the cavity. The compression spring is arranged in the first blind hole, and the top end of the compression spring is arranged in close contact with the positioning group board. The top end of the rubber plug is installed in the positioning group board, the rubber plug is synchronous with the positioning group board, the rubber plug is in interference fit with the second blind hole. When the positioning group board is in the first position, the friction force between the rubber plug and the second blind hole is greater than the elastic force applied by the compression spring to the positioning group board.

5. The injection mold of claim 1, wherein, The top pin group board is arranged on the side of the movable die assembly away from the fixed die assembly, and the movable die assembly is further provided with a lifting through-hole, and the hammer is arranged in the lifting through-hole. Definition: when the positioning group board is in the first position, the distance between the top surface of the top pin group board and the bottom surface of the movable die assembly is L, the distance between the top surface of the positioning group board and the top wall of the accommodating cavity is L1, and the distance between the top end of the hammer and the positioning group board is L2. The L, L1 and L2 satisfy: L=L1+L2.

6. The injection mold of claim 1, wherein, The movable die assembly further comprises a side pressing insert, the movable die assembly is provided with an insert insertion hole, the insert insertion hole is communicated with the cavity, and the side pressing insert is used for being inserted into the insert insertion hole; The film further comprises a bending part and excess gap parts arranged on both sides of the bending part, when the side pressing insert is installed, the side pressing insert passes through the excess gap parts and is inserted into the insert insertion hole to press the bending part; The top of the side pressing insert is provided with a positioning protrusion, after the side pressing insert is inserted into the insert insertion hole, the positioning protrusion abuts against the bending part; Definition: the direction from one excess gap part to the other excess gap part is a first direction; In the first direction, the size of the positioning protrusion is smaller than the size of the bending part.

7. The injection mold of claim 6, wherein, The ejector pin structure further comprises an insert ejector pin, the bottom end of the insert ejector pin is installed on the ejector pin group plate, the top end of the insert ejector pin passes through the movable die assembly and the positioning group plate and abuts against the side pressing insert, and the insert ejector pin is used for ejecting the side pressing insert.

8. The injection mold of claim 1, wherein, The placement boss comprises a placement site and a flange, the placement site is used for placing the film, the flange is arranged along the circumference of the placement site, and the size of the flange along the thickness direction of the film is greater than the thickness of the film.

9. The injection mold of claim 1, wherein, The fixed die assembly is provided with a main runner, the fixed die assembly and the movable die assembly are matched to form the cavity and a glue guiding cavity, and the main runner, the glue guiding cavity and the cavity are communicated in sequence.

10. The injection mold of claim 9, wherein, The ejector pin structure further comprises a nozzle ejector pin, an article ejector pin and a supporting sheet, the bottom end of the nozzle ejector pin is installed on the ejector pin group plate, the top end of the nozzle ejector pin passes through the movable die assembly and the positioning group plate and extends into the glue guiding cavity; The supporting sheet is arranged in close contact with the bottom surface of the film, the bottom end of the article ejector pin is installed on the ejector pin group plate, and the top end of the article ejector pin passes through the movable die assembly and the positioning group plate and is connected with the supporting sheet; The nozzle ejector pin and the article ejector pin move synchronously with the ejector pin group plate.

Images