In-mold die-cut injection mold

Abstract

The present application relates to a kind of in-mold die cutting injection molds, including upper die body and lower die body, the lower die body is equipped with the mold insert for placing film, the upper die body is equipped with the movable mold insert matched with mold insert. Multiple slidable sliders are provided on the mold insert, each slider is equipped with a positioning column, for passing through the positioning hole on the film to realize the initial positioning of film. During mold closing process, the ejector rod on movable mold insert pushes slider to slide, thereby driving the positioning column to move, tensioning and positioning the film;Then, the convex part on movable mold insert and mold insert cooperates with the groove, realizes the synchronous die cutting and injection molding of film. The present application realizes the automatic positioning, tensioning and die cutting molding of film in mold, avoids manual cutting and manual error, improves the positioning accuracy and molding efficiency of film, is suitable for vehicle display, electronic panel and other film insert injection molding scenarios, has higher automation adaptability and industrial application value.

Description

Technical Field

[0001] The present application relates to the technical field of injection molds, and in particular to an in-mold punching injection mold. Background Art

[0002] In injection molding processes like in-mold decoration (IMD) and in-mold labeling (IML), membranes serve as functional exterior components, pattern carriers, or functional cover films. They are widely used in applications such as home appliance panels, automotive center consoles, and electronic product housings. To achieve a tight integration of the pattern and the plastic component, the membrane must be accurately positioned within the mold cavity before injection molding and maintain a tight fit without deformation.

[0003] In the existing technology, most diaphragms are produced by "out-of-mold punching + manual sheeting" or "out-of-mold punching + robot sheeting". The typical process includes:

[0004] 1. During the diaphragm pre-processing stage, a stamping die is used to cut the large-sized diaphragm into the required contour;

[0005] 2. Place the cut diaphragm on the fixed or movable mold of the mold manually or by equipment;

[0006] 3. After injection molding is completed, take out the finished product.

[0007] The above method has the following defects:

[0008] 1. Since the cutting and positioning of the diaphragm are separate processes, the positioning error is large, which can easily lead to problems such as warping, offset, and breakage;

[0009] 2. The diaphragm is exposed outside the mold for a long time, which easily absorbs impurities and dust, affecting the molding quality;

[0010] 3. Cutting, conveying, and placing are multiple links connected in series, which seriously limits the degree of automation;

[0011] 4. To ensure positioning accuracy, it is often necessary to configure high-precision cutting devices, swing mechanisms, vacuum suction cups and other auxiliary equipment, which is very expensive;

[0012] 5. If the diaphragm is not fully tensioned during the injection molding process, it is easy to move due to thermal expansion and contraction of the material or mold closing impact, affecting the appearance or functional consistency.

[0013] Some existing technologies attempt to integrate the diaphragm positioning function inside the mold, but there are common problems such as complex structure, difficult debugging, inability to achieve tensioning or poor punching quality, and it is still difficult to meet the industry demand for high-quality and high-efficiency in-mold molding. Summary of the Invention

[0014] The present application provides an in-mold punching injection mold, which can complete the automatic positioning, tensioning and punching operations of the diaphragm during the mold closing process.

[0015] The in-mold die cutting injection mold provided by the application comprises an upper mold body and a lower mold body, the upper mold body comprises a movable mold plate, the movable mold plate is provided with a movable mold insert, the lower mold body comprises a fixed mold plate, the fixed mold plate is provided with a fixed mold insert, and a mold cavity is formed between the fixed mold insert and the movable mold insert after the mold is closed;

[0016] The upper surface of the fixed mold insert is used for placing a film, the fixed mold insert is provided with a first matching part, and the movable mold insert is provided with a second matching part;

[0017] The fixed mold insert is provided with a plurality of sliders which are distributed around the mold cavity at intervals, each slider can slide in the direction towards or away from the mold cavity, and each slider is provided with a positioning column for passing through a positioning hole on the film to initially position the film;

[0018] The movable mold insert is in contact with all the sliders during the mold closing process, and the sliders are pushed to slide in the direction away from the mold cavity from the initial position to drive the plurality of positioning columns to tension and position the film; then the mold is continuously closed, and the first matching part and the second matching part are matched to cut the film into a shape matched with the bottom surface and the side wall of the mold cavity;

[0019] Each slider is provided with an elastic reset member for resetting the slider to the initial position, and the elastic reset member is arranged between the slider and the fixed mold insert;

[0020] The fixed mold insert is provided with a plurality of sliding grooves which are distributed around the mold cavity, and the extension direction of each sliding groove is towards or away from the mold cavity, and a plurality of sliders are slidingly arranged in the plurality of sliding grooves;

[0021] Each slider is provided with a through hole penetrating in the thickness direction of the slider, the through hole has an inclined surface arranged in the thickness direction of the slider, the movable mold insert is provided with a plurality of jacks for pushing the sliders, and when the mold is closed, the plurality of jacks are in contact with the inclined surfaces on the plurality of sliders to push the sliders to slide in the sliding grooves in the direction away from the mold cavity;

[0022] The upper surface of the fixed mold insert is provided with a groove, the first matching part is a groove wall of the groove, the lower surface of the movable mold insert is provided with a convex part, the second matching part is a peripheral wall of the convex part, the groove and the convex part cooperate to form the mold cavity after the mold is closed, and the peripheral wall of the convex part and the groove wall of the groove are in contact with each other to cut the film.

[0023] Preferably, the elastic reset member is a compression spring, one end of the compression spring abuts against one end of the slider away from the mold cavity, and the other end of the compression spring abuts against one end of the sliding groove away from the mold cavity.

[0024] As preferred, each positioning column is fixedly connected with a limiting head, the bottom surface of each slider is provided with a recess for accommodating the limiting head, and each slider is provided with a plug-in hole penetrating from the recess to the top surface, which is used for inserting the positioning column.

[0025] The present application provides an in-mold trimming injection mold, which realizes the tensioning and positioning of the diaphragm by setting a plurality of slidable sliders and positioning columns thereon on the fixed mold insert, and completes the in-mold trimming of the diaphragm through the mold closing process, and has the following technical effects and advantages:

[0026] 1. The present application realizes the positioning of the diaphragm by using the slidable sliders and the positioning columns thereon, and the diaphragm is provided with positioning holes in advance, the initial positioning of the diaphragm is completed by inserting the positioning columns into the positioning holes, and in the mold closing process, the sliders are pushed by the movable mold insert to slide in the direction away from the mold cavity, thereby driving the plurality of positioning columns to stretch the diaphragm outwardly, realizing the tensioning and positioning; compared with the positioning method in the prior art, which is realized by manually placing the diaphragm and vacuum adsorption, the automatic positioning structure of the present application can significantly improve the accuracy and repeatability of positioning, effectively prevent the diaphragm from deviating and wrinkling due to thermal expansion and contraction, mold impact and other factors, and thus ensure the appearance and functional consistency of the injection molded product;

[0027] 2. The present application sets a top rod structure on the movable mold insert, in the mold closing process, the top rod contacts the inclined surface of the slider to push the slider to slide outwardly, so that the tensioning action is formed between the positioning columns on the slider and the positioning holes of the diaphragm; this tensioning and positioning method does not need an additional servo system or tensioning driving device, the structure is more simple, the response synchronization is higher, and the tensioning force is uniform and controllable, which can ensure that the diaphragm is attached to the mold cavity, the surface is flat, there is no bubble and no wrinkle during injection, and the yield and appearance consistency are improved;

[0028] 3. The present application sets a convex part (second matching part) on the movable mold insert and a recess (first matching part) on the fixed mold insert, and when the diaphragm is tensioned and the mold is closed to the end point, the diaphragm is trimmed by the matching edges of the two parts; this process can complete the trimming before the diaphragm contacts the molten plastic, realizing the integrated operation of in-mold positioning, trimming and injection; compared with the traditional out-mold trimming + manual or automatic diaphragm placing method, this scheme greatly reduces the operation steps, improves the automation degree, saves the diaphragm conveying equipment and cutting process, and avoids the product defects caused by the burrs or poor cutting of the diaphragm edge. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a structural schematic view of the in-mold trimming injection mold of the embodiment of the present application;

[0030] Figure 2A top view of an in-mold punching injection mold according to an embodiment of the present invention;

[0031] Figure 3 for Figure 2 AA section view in the figure;

[0032] Figure 4 for Figure 3 Enlarged view of area A in the middle;

[0033] Figure 5 This is a schematic diagram of the product structure of the injection molding using the in-mold punching injection mold according to an embodiment of the present invention.

[0034] Explanation of the accompanying reference numerals: 1. Upper mold body; 2. Lower mold body; 10. Moving mold plate; 11. Moving mold insert; 111. Positioning hole; 112. Ejector rod; 12. Protrusion; 121. Outer peripheral wall; 122. Inner peripheral wall; 20. Fixed mold plate; 21. Fixed mold insert; 211. Slide groove; 212. Slider; 213. Positioning column; 2131. Limiting head; 214. Through hole; 215. Inclined surface; 216. Compression spring; 217. Insert; 22. Groove; 221. Outer ring groove wall; 222. Inner ring groove wall; 30. Diaphragm; 31. Diaphragm positioning hole; 40. Injection molded part. DETAILED DESCRIPTION

[0035] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0036] like Figures 1 to 4 As shown, the in-mold punching injection mold provided in this embodiment includes an upper mold body 1 and a lower mold body 2. The upper mold body 1 includes a movable mold plate 10, on which a movable mold insert 11 is provided; the lower mold body 2 includes a fixed mold plate 20, on which a fixed mold insert 21 is provided. After the mold is closed, the fixed mold insert 21 and the movable mold insert 11 enclose a mold cavity.

[0037] Diaphragm 30 is the target material to be cut and injection-molded. Initially, it is laid flat on the upper surface of fixed mold insert 21, where it is subsequently combined with the molded part to form the in-mold injection structure. Diaphragm 30 is provided with multiple diaphragm positioning holes 31, which mate with positioning posts 213 in the lower mold to achieve initial positioning and rough positioning of the diaphragm before the mold is initially closed.

[0038] The fixed mold insert 21 is provided with a plurality of chute slots 211 spaced circumferentially around the mold cavity. A slider 212 is slidably mounted within each chute 211, allowing reciprocating movement within the slot 211 in directions toward or away from the mold cavity. Each slider 212 is provided with an upwardly extending positioning post 213, which passes through a diaphragm positioning hole 31 in the diaphragm to provide preliminary positioning of the diaphragm 30 prior to initial mold closing.

[0039] In order to ensure that the positioning column 213 is stable and reliable, the lower part of each positioning column 213 is fixedly connected with a limiting head 2131, the limiting head 2131 is inserted in a recess provided on the bottom surface of the sliding block 212, and the positioning column 213 is inserted in an insertion hole extending from the recess to the top surface of the sliding block 212, thereby forming a limiting connection mode which is stable in structure and convenient to assemble.

[0040] The movable die insert 11 is provided with a plurality of positioning holes 111 corresponding to the plurality of positioning columns 213, and in the further clamping process of the mold, the positioning column 213 is inserted into the corresponding positioning hole 111, thereby achieving axial positioning between the diaphragm and the upper die and enhancing the stability of the diaphragm 30.

[0041] In order to realize automatic tensioning of the diaphragm 30, a through hole 214 extending through the thickness direction of each sliding block 212 is provided, and an inclined surface 215 arranged along the thickness direction is arranged in the through hole 214. A plurality of ejector pins 112 are provided below the movable die insert 11, and the plurality of ejector pins 112 sequentially penetrate the through hole 214 of the sliding block 212 and first contact the inclined surface 215 during the clamping process. When the clamping continues, the inclined surface 215 is driven by the pressure of the ejector pin 112, so that the sliding block 212 starts to slide along the sliding groove 211 in a direction away from the mold cavity from the initial position, thereby driving the positioning column 213 thereon to move outward synchronously, realizing multi-point synchronous tensioning and positioning of the diaphragm 30. When the sliding block 212 is in the initial position, the sliding block 212 abuts against the end of the sliding groove 211 close to the mold cavity. Subsequently, the ejector pin 112 continues to penetrate the through hole 214 and is inserted into the insertion hole 217 provided on the fixed die insert 21, further limiting the sliding block 212 and the ejector pin 112.

[0042] In order to enable the sliding block 212 to return to the initial state after injection molding is completed, a resilient reset member, preferably a compression spring 216, is arranged between each sliding block 212 and the sliding groove 211 corresponding thereto. One end of the compression spring 216 abuts against one end of the sliding block 212 away from the mold cavity, and the other end abuts against the end of the inner wall of the sliding groove 211. After the mold is opened, the compression spring 216 releases the pre-tightening force, so that the sliding block 212 and the positioning column 213 thereon automatically return to the initial position, thereby preparing for the initial state for the diaphragm laying and punching action in the next time. The reset structure does not depend on external driving, and has the advantages of simple structure, rapid response, good durability and convenient maintenance.

[0043] The upper surface of the fixed die insert 21 is provided with a recess 22 for cooperating with punching, and the lower surface of the movable die insert 11 is provided with a convex portion 12 matched therewith. In the final clamped state of the mold, the convex portion 12 cooperates with the recess 22 to form a mold cavity for injection molding.

[0044] Further, the groove 22 includes an outer ring groove wall 221 and an inner ring groove wall 222 arranged in a ring shape, and the convex part 12 includes an outer peripheral wall 121 and an inner peripheral wall 122 matched therewith. When the mold is closed, the outer peripheral wall 121 and the outer ring groove wall 221 form a shearing matching surface for cutting the outer contour of the film sheet 30, and the inner peripheral wall 122 and the inner ring groove wall 222 form a second set of shearing matching surfaces for simultaneously cutting the functional holes or windowed areas in the film sheet. This structure realizes the synchronous punching of the outer periphery and the inner hole of the film sheet, and after forming, the film sheet shape is highly matched with the profile of the mold cavity, and the fitting effect is good, reducing the post-processing steps.

[0045] As shown in Figure 5 , the product molded by using the mold includes an injection molded part 40 and a film sheet 30 attached to the lower surface, the outer peripheral wall and the inner wall of the functional hole thereof. In this embodiment, the film sheet 30 has two functional holes, and two sets of inner ring groove walls 222 and inner peripheral walls 122 are correspondingly arranged to realize the accurate punching and forming of the functional holes. The product has high integration degree, complete structure and good surface consistency.

[0046] The in-mold punching injection mold of this embodiment has the following advantages:

[0047] 1. The film sheet 30 is positioned by multi-point tensioning in the mold through the slider 212-top rod 112 structure, which ensures that the film sheet 30 remains flat and fits during forming, avoiding problems such as wrinkles and displacement, and significantly improving the forming consistency and appearance quality;

[0048] 2. The outer contour and functional hole punching of the film sheet 30 are simultaneously completed by using the built-in shearing structure (convex part 12 and groove 22) of the mold, which eliminates the need for pre-cutting and fitting processes, reduces manual intervention, and realizes true in-mold integration;

[0049] 3. The slider 212 and the sliding groove 211 are modular structures, and the number, arrangement and spacing of the positioning columns 213 of the sliders 212 can be flexibly adjusted to adapt to film sheets of different sizes and shapes, support multi-product common mold design, and be suitable for various scenes such as automotive trim parts, electronic panels and intelligent housings;

[0050] 4. The mold structure supports continuous feeding (such as roll feeding) of the film sheet 30, mechanical hand feeding and automatic punching injection molding, and is seamlessly integrated with industrial automation equipment, which can be widely used in automatic production lines in high-end manufacturing fields;

[0051] 5. All sliders 212, compression springs 216 and positioning columns 213 are centrally arranged in the fixed mold insert 21 to avoid interference with the main cavity of the injection molding, and the sliders 212 are reset by elastic prestress without the need for electric control or pneumatic driving, which is stable in structure and easy to maintain.

[0052] This specification and drawings are merely illustrative of the present application and are intended to cover any and all modifications, variations, combinations, or equivalents within the scope of this application. Obviously, those skilled in the art may make various modifications and variations to this application without departing from the scope of this application. Thus, this application is intended to include such modifications and variations as fall within the scope of this application and its equivalents.

Claims

1. An in-mold punching injection mold, characterized in that: The mold comprises an upper mold body (1) and a lower mold body (2), wherein the upper mold body (1) comprises a movable mold plate (10), and a movable mold insert (11) is provided on the movable mold plate (10); the lower mold body (2) comprises a fixed mold plate (20), and a fixed mold insert (21) is provided on the fixed mold plate (20); after the mold is closed, a mold cavity is formed between the fixed mold insert (21) and the movable mold insert (11); The upper surface of the fixed mold insert (21) is used for placing a diaphragm, the fixed mold insert (21) is provided with a first matching portion, and the movable mold insert (11) is provided with a second matching portion; The fixed mold insert (21) is provided with a plurality of sliders (212) spaced apart around the mold cavity, each slider (212) being capable of sliding in a direction toward or away from the mold cavity, and each slider (212) is provided with a positioning post (213) for passing through a positioning hole on the diaphragm to initially position the diaphragm; The movable mold insert (11) contacts with all the sliders (212) during the mold closing process and pushes the sliders (212) to slide from the initial position in a direction away from the mold cavity, thereby driving the plurality of positioning columns (213) to tension and position the diaphragm; the mold is then closed, and the first matching portion and the second matching portion cooperate to punch the diaphragm into a shape that matches the bottom surface and side wall of the mold cavity; Each slider (212) is equipped with an elastic reset member for resetting the slider (212) to an initial position, and the elastic reset member is arranged between the slider (212) and the fixed mold insert (21); The fixed mold insert (21) is provided with a plurality of slide grooves (211) distributed around the mold cavity, each slide groove (211) extends toward or away from the mold cavity, and a plurality of sliders (212) are respectively slidably arranged in the plurality of slide grooves (211); Each slider (212) is provided with a through hole (214) extending through the slider (212) in a thickness direction thereof, and the through hole (214) has an inclined surface (215) provided in a thickness direction of the slider (212). The movable mold insert (11) is provided with a plurality of push rods (112) for pushing the sliders (212). When the mold is closed, the plurality of push rods (112) respectively contact the inclined surfaces (215) on the plurality of sliders (212) to push the sliders (212) to slide in the chute (211) in a direction away from the mold cavity. The upper surface of the fixed mold insert (21) is provided with a groove (22), the first matching portion is the groove wall of the groove (22), the lower surface of the movable mold insert (11) is provided with a convex portion (12), the second matching portion is the peripheral wall of the convex portion (12), after the mold is closed, the groove (22) and the convex portion (12) cooperate to form a mold cavity, and the peripheral wall of the convex portion (12) and the groove wall of the groove (22) cooperate and contact with each other to cut the diaphragm.

2. The in-mold punching injection mold according to claim 1, characterized in that: The elastic return member is a compression spring (216), one end of the compression spring (216) abuts against the end of the slider (212) away from the mold cavity, and the other end of the compression spring (216) abuts against the end of the slide groove (211) away from the mold cavity.

3. The in-mold punching injection mold according to claim 1, characterized in that: Each positioning column (213) is fixedly connected to a limiting head (2131), and a recess for accommodating the limiting head (2131) is provided on the bottom surface of each slider (212). Each slider (212) is provided with a plug hole extending from the recess to the top surface, and the plug hole is used to insert and pass through the positioning column (213).

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