Dynamic core-pulling mechanism of mold

Abstract

The utility model discloses a dynamic core-pulling mechanism of a mold, and relates to the technical field of injection molding processes. A sliding block linearly translates along a first direction relative to a mold core and drives a guide rail to synchronously translate; the core-pulling assembly can do linear translation in the second direction relative to the mold core, the core-pulling assembly is assembled on the guide rail in a sliding mode, and when the guide rail moves along with the sliding block in the first direction, the core-pulling assembly is driven to translate in the second direction; in the injection molding process, the end of the core pulling assembly extends into the inner cavity of the mold core, the core pulling assembly divides the inner cavity of the mold core into two cavities, and each cavity is used for injecting one material. The core pulling assembly is used for separating the two materials in the material filling process and pulling the two materials out of the mold core in the pressure maintaining process, flowing of the materials is greatly reduced in the pressure maintaining process, but the materials are enough to make up the space originally occupied by the core pulling assembly, and the two materials are fused and solidified; after the core pulling assembly is pulled out, the two materials only flow in a small range, a clear boundary can be formed, and the product quality is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molding technology, and further relates to a dynamic core-pulling mechanism for a mold. Background Art

[0002] Coinjection molding involves simultaneously filling a mold cavity with two different molten plastics, A and B, resulting in a single product with two different plastic materials. This process differs significantly from two-shot molding. In two-shot molding, one material is filled first, then the other is added after cooling and solidification. In two-shot molding, a distinct dividing line forms at the junction of the two materials. However, products produced with coinjection molding have a smoother surface at the junction of the two materials.

[0003] Co-injection molding is primarily used in buttons for automotive electronics. These buttons require a beacon with a luminous function, and the beacon's light must be different colors. This function is achieved by using co-injection molding, and through manufacturing processes such as painting and photolithography, the beacon is placed on different materials to achieve two different luminous colors using two materials, A and B.

[0004] The biggest technical bottleneck of the existing co-injection molding process is the mixing problem of the two materials A and B. Since the two materials A and B are fluid before solidification, the boundary between the two materials A and B does not match the theoretical position. The main difficulties of the existing technology are:

[0005] (1) Unstable process: The boundary line between the two materials A and B is difficult to control during the production process. Any slight fluctuation in the process will lead to a huge change in the boundary line between the two materials, resulting in low production yield.

[0006] (2) Strict gate position requirements: In order to ensure that the boundary between the two materials in co-injection molding is within a reasonable range, the gate position must be accurate and reasonable. Once the gate position setting has a slight deviation, it may cause the boundary between the two materials A and B to be unreasonable.

[0007] (3) Strict restrictions on product structure: The existing technology has very strict restrictions on product structure, that is, the structures of the two materials A and B must be approximately symmetrical and close in size.

[0008] For those skilled in the art, how to accurately and clearly form a dividing line between two materials is a technical problem that needs to be solved. Utility Model Content

[0009] The utility model provides a dynamic core pulling mechanism for a mold. With the help of the cooperation between the slider and the core pulling assembly, the core pulling assembly is pulled out during the pressure holding stage, which helps to form a clear dividing line between the two materials. The specific scheme is as follows:

[0010] A dynamic core pulling mechanism for a mold, comprising:

[0011] A slider capable of linear translation relative to the mold core along a first direction, wherein a guide rail is provided on the slider;

[0012] A core pulling assembly is slidably assembled on the mold core along the second direction, and the core pulling assembly is slidably assembled on the guide rail. When the guide rail moves along the first direction with the slider, the core pulling assembly is driven to translate along the second direction;

[0013] Among them, the end of the core pulling assembly can extend into the inner cavity of the mold core, dividing the inner cavity of the mold core into two cavities, each cavity is used for injecting one material; the core pulling assembly is used to separate the two materials during the filling process and to pull them out from the mold core during the pressure holding process.

[0014] Optionally, the first direction is perpendicular to the second direction, and the length direction of the guide rail forms an angle with the first direction.

[0015] Optionally, a slot is provided on the slider, and the guide rail is provided in the slot.

[0016] Optionally, the guide rail is a flat plate, and a sliding channel matching the guide rail is provided on the core pulling assembly.

[0017] Optionally, a guide block is provided on the slide block, and the guide block is used to slide in cooperation with the sliding groove on the mold core.

[0018] Optionally, the core pulling assembly includes a movable block and an insert, and the insert is detachably assembled on the movable block; the movable block moves relative to the slider, and the insert is used to extend into the mold core.

[0019] Optionally, the slider is provided with a driver, and the driver is used to drive the slider to translate along the first direction.

[0020] Optionally, a sensor is further included, wherein the sensor is used to detect the position of the slider, and the driver controls the stroke according to the detection signal of the sensor.

[0021] Optionally, the slider is linear, U-shaped or "mountain" shaped, and more than two guide rails are provided on the slider, thereby driving more than two core pulling assemblies to move simultaneously.

[0022] Optionally, the end of the core-pulling assembly extends from the bottom of the mold core into the mold core, and the stroke of the core-pulling assembly is greater than the thickness of the injection molded product.

[0023] The utility model provides a dynamic core-pulling mechanism for a mold, wherein a slider makes a linear translation relative to a mold core along a first direction, and drives a guide rail arranged thereon to translate synchronously; a core-pulling assembly can make a linear translation relative to the mold core along a second direction, and the core-pulling assembly is slidably assembled on the guide rail, and when the guide rail moves along the first direction with the slider, the core-pulling assembly is driven to translate along the second direction; during the injection molding process, the end of the core-pulling assembly extends into the inner cavity of the mold core, and the core-pulling assembly divides the inner cavity of the mold core into two cavities, each cavity being injected with one material respectively; the core-pulling assembly is used to separate the two materials during the process of filling the material, and to pull the materials out of the mold core during the pressure holding process, and the flow of the materials is greatly reduced during the pressure holding process, but the materials are sufficient to make up for the space originally occupied by the core-pulling assembly, so that the two materials fuse with each other and solidify; after the core-pulling assembly is pulled out, the two materials only flow in a small range, which can form a clear dividing line, thereby improving the quality of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 This is an axonometric diagram from an oblique downward perspective of an embodiment of the dynamic core-pulling mechanism of the mold of the present invention;

[0026] Figure 2 This is an axonometric diagram from an oblique upper perspective of an embodiment of the dynamic core-pulling mechanism for a mold of the present invention;

[0027] Figure 3 for Figure 2 A partial enlarged view of the core pulling component;

[0028] Figure 4 This is a front view schematic diagram of an embodiment of the dynamic core pulling mechanism of the mold of the utility model;

[0029] Figure 5 for Figure 4 A partial enlarged view of the dotted circle;

[0030] Figure 6 This is a bottom view of an embodiment of the dynamic core-pulling mechanism of the mold of the utility model;

[0031] Figure 7 It is an axonometric diagram of a first embodiment of the cooperation between the slider and the core pulling assembly;

[0032] Figure 8 It is an axonometric diagram of a second embodiment of the cooperation between the slider and the core pulling assembly;

[0033] Figure 9 A schematic isometric view of a third embodiment of the cooperation between the slider and the core pulling assembly;

[0034] Figure 10 Schematic diagram of the injection molding process.

[0035] The diagram includes:

[0036] Slider 1, guide rail 11, guide block 12, sensor block 13, core pulling assembly 2, movable block 21, insert 22, driver 3, sensor 4, fixing bracket 41, mold core 5, partition cavity ①, partition cavity ②, two materials AB. DETAILED DESCRIPTION

[0037] In order to enable those skilled in the art to better understand the technical solution of the present invention, the dynamic core-pulling mechanism of the mold of the present invention will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0038] The utility model provides a dynamic core pulling mechanism for a mold, comprising a slider 1 and a core pulling assembly 2. The slider 1 can move linearly relative to the mold core along a first direction. Figure 1 As shown, slider 1 moves in the X-axis direction, enabling reciprocating translation along the X-axis. The mold core is a critical, precision component at the center of the mold, where the molded product solidifies and forms. Slider 1 is provided with a guide rail 11, which is fixed relative to the slider. Movement of slider 1 causes the guide rail 11 to move synchronously with it.

[0039] The core pulling assembly 2 is slidably mounted on the mold core and is capable of linear translation relative to the mold core in a second direction, which is different from the first direction. The core pulling assembly 2 is slidably mounted on a guide rail 11. The guide rail 11 and the core pulling assembly 2 are capable of transmitting force relative to each other, and the guide rail 11 drives the displacement of the core pulling assembly 2. When the guide rail 11 moves along the slider 1 in the first direction, the guide rail 11 drives the core pulling assembly 2 to translate in the second direction. The core pulling assembly 2 moves toward or away from the mold core in the second direction, and when the core pulling assembly 2 moves toward the mold core in the second direction, it can extend into the mold core.

[0040] The end of the core pulling component 2 can be extended into the inner cavity of the mold core, dividing the inner cavity of the mold core into two cavities, each cavity is used to inject one material; the core pulling component 2 is used to separate the two materials during the filling process and to pull them out of the mold core during the pressure holding process. Figure 10As shown in the figure, the four states of the injection molding process are shown from left to right, namely ⅠⅡⅢⅣ, which represent mold closing, filling, pressure holding and solidification of the finished product respectively; the upper mold and the lower mold of the mold core 5 are closed to form a cavity, and the core pulling component 2 extends into the cavity. As shown in state Ⅰ, the core pulling component 2 divides the internal cavity into two relatively independent spaces, separation chamber ① and separation chamber ②; as shown in state Ⅱ, separation chamber ① and separation chamber ② are respectively injected with liquids of two different materials AB. At this time, the two injected liquids are blocked by the core pulling component 2, and the two liquids cannot contact each other; as shown in state Ⅲ, when the core pulling component 2 is pulled out of the mold core 5, the two liquids have not yet been completely solidified and still have a certain fluidity. The two liquids contact and merge into one, but compared with the filling process, the fluidity of the liquid at this time is worse, and no large-scale flow will occur. Only a small range of flow fusion will occur. In this process, the boundary line position of the two liquids still maintains the position defined by the core pulling component 2, which improves the regular and clear molding effect of the boundary between the two materials AB after the product is solidified. Since the two materials fuse together in a fluid state, after cooling and solidification, the surfaces of the two materials become flat and consistent. In addition, since the two materials are separated and blocked by the core-pulling assembly 2 during the filling process, the size of the two materials can be set arbitrarily, and the filling amount of the two materials does not need to be roughly equal; nor does the filling time of the two materials need to be completely consistent.

[0041] It should be noted that the core-pulling assembly 2 defines the dividing line between the two materials AB. The shape of the dividing line can be a straight line, a curve, a wavy line, a zigzag line, etc. These specific structures should be included in the scope of protection of this utility model. In addition, it should be added that this utility model is mainly introduced with the fusion of two materials as an example. The two materials are separated from each other by a core-pulling assembly 2. It is also possible to set up applications for the fusion of more materials. For example, three materials require two core-pulling assemblies 2, and N core-pulling assemblies 2 correspond to N+1 materials.

[0042] On the basis of the above scheme, the first direction of the present invention is perpendicular to the second direction, the first direction is horizontal, and the second direction is vertical. When the slider 1 moves horizontally, it drives the core pulling assembly 2 to move in the vertical direction. In order to achieve the driving effect of the guide rail 11, the length direction of the guide rail 11 is at an angle to the first direction. The guide rail 11 is not set horizontally. The guide rail 11 forms a certain angle with the horizontal direction. The thickness of each position in the working range of the guide rail 11 remains consistent. Since the core pulling assembly 2 is limited to only vertical movement, different positions of the guide rail 11 face the core pulling assembly 2 when it moves horizontally. Different positions have different heights, so that the core pulling assembly 2 moves vertically.

[0043] Combine Figure 2 、 Figure 3 、 Figure 7As shown, the slider 1 is provided with a slot, which can be provided in different forms. The slot forms a downwardly recessed avoidance space, and the guide rail 11 is provided in the slot. The two ends of the guide rail 11 are respectively fixed on the two side walls of the slot. The position of the guide rail 11 is lower than the upper surface of the slider 1, and no protrusion is formed on the outer surface of the slider 1. Figure 2 、 Figure 3 In the structure shown, the width of the slot is smaller than the width of the slider 1, and the depth of the slot is smaller than the depth of the slider 1, forming an "L"-shaped slot structure with a bottom surface and three side surfaces, and the guide rail 11 is a side wall protruding from the "L"-shaped slot structure. Figure 7 、 Figure 8 In the illustrated structure, the slot width is equal to the width of the slider 1, and the slot depth is less than the slider 1's depth, forming a trough-like structure with a bottom surface and two side surfaces. The guide rail 11 is fixed at both ends and is suspended in the middle. In addition to the structure in which the slider 1 is provided with a slot and the guide rail 11 is disposed therein, the slider 1 can also be a flat structure with the guide rail 11 protruding from its outer surface. Such a structure is also included in the scope of protection of the present utility model.

[0044] for Figure 2 、 Figure 3 In the structure shown, a concave-shaped open notch is provided on the core pulling assembly 2 for slidingly matching with the guide rail 11. The side wall of the core pulling assembly 2 can contact the side of the "L"-shaped groove structure to keep the core pulling assembly 2 in a vertical state. Figure 7 、 Figure 8 In the illustrated structure, the guide rail 11 is a flat plate, and the core pulling assembly 2 is provided with a sliding channel that matches the guide rail 11. The sliding channel is slightly larger than the cross-section of the guide rail 11, and the two cooperate to achieve sliding. The guide rail 11 is non-cylindrical, so the core pulling assembly 2 cannot rotate relative to the guide rail 11. The contact area between the core pulling assembly 2 and the guide rail 11 has a certain thickness. The inner surface of the sliding channel of the core pulling assembly 2 and the outer surface of the guide rail 11 have an overlapping contact area, which ensures that the core pulling assembly 2 remains upright and does not tilt.

[0045] A guide block 12 is provided on the slider 1, and the guide block 12 is used to slide with the sliding groove on the mold core. Figure 1 、 Figure 4 、 Figure 6As shown, multiple independent guide blocks 12 are provided on the slider 1. Each guide block 12 has equal dimensions and can be slidably assembled in the sliding groove, allowing the slider 1 to move only along the X-axis and not along the Y-axis or Z-axis. In this embodiment, the width of the guide blocks 12 is greater than the width of the main body of the slider 1. The guide blocks 12 are fixed to the lower middle portion of the slider 1, leaving the upper portion of the slider 1 exposed. The upper surface of the guide blocks 12 is preferably flush with or lower than the bottom surface of the slotted area where the guide rails 11 are located to avoid interference with the core pulling assembly 2. Alternatively, no guide blocks 12 are provided in the slotted area.

[0046] Combine Figure 4 、 Figure 5 As shown, the core pulling assembly 2 includes a movable block 21 and an insert 22. The insert 22 can be detachably assembled on the movable block 21, so that the insert 22 can be quickly replaced. By adopting a disassembly and assembly structure, the corresponding insert 22 can be replaced according to different products, so that other parts of the entire mold dynamic core pulling mechanism can be reused.

[0047] The movable block 21 slides with the guide rail 11 and is provided with a sliding channel for the guide rail 11 to be inserted. The movable block 21 moves relative to the slider 1. The insert 22 is used to extend into the mold core, forming a partition at the boundary between the two material types of the product. The insert 22 can be made of steel, copper, aluminum, or other materials. The insert 22 is designed to match the product size and the boundary shape. The thickness of the insert 22 is small to avoid occupying excessive space in the mold core 5 cavity. The movable block 21 can be set to a larger thickness to create a large overlap area with the guide rail 11 to ensure stability during movement.

[0048] It should be noted that the present invention does not exclude the structure of the core pulling component 2 being arranged in an integrated manner. If an integrated structure is adopted, the lower part has a larger thickness and the upper part has a smaller thickness, and the same effect can also be achieved.

[0049] Combine Figure 1 、 Figure 4 As shown, the present invention is provided with a driver 3 at one end of the slider 1. Driver 3 can be an electric cylinder, a pneumatic cylinder, a rack-and-pinion mechanism, or other structures. Driver 3 is used to drive the slider 1 to translate in a first direction, thereby achieving an automated core pulling process. A clamping block structure is provided at the output end of driver 3. The clamping block structure is configured to engage with the slider 1 to achieve power transmission. The clamping block has a small opening and a large bottom. A protrusion is provided on the slider 1, which can be snapped into the inner cavity of the clamping block structure.

[0050] The dynamic core pulling mechanism of the mold further includes a sensor 4, which is used to detect the position of the slider 1. The driver 3 controls the stroke according to the detection signal of the sensor 4. Figure 1 、 Figure 4As shown, a sensing block 13 is provided on the slider 1. The sensing block 13 protrudes from the slider 1 and moves synchronously with the slider 1, approaching or moving away from the sensor 4. The sensor 4 is mounted on a fixing bracket 41, and the fixing bracket 41 is used to position the sensor 4.

[0051] The slider 1 provided by the present invention has different appearance structures and can be applied to different scenes. Figure 1 、 Figure 7 、 Figure 8 As shown, the slider 1 adopts a linear structure, and one or a row of guide rails 11 are set on the slider 1; Figure 9 As shown, the slider 1 is a U-shaped structure, and two or two rows of guide rails 11 can be set on the slider 1; the slider 1 can also be set in a "mountain" shape, and three or three rows of guide rails 11 can be set on the slider 1.

[0052] The guide rails 11 are matched with the core pulling components 2 in a one-to-one manner. More than two guide rails 11 are provided on the slider 1, thereby simultaneously driving more than two core pulling components 2 to move, and core pulling operations can be performed on multiple products at the same time.

[0053] Specifically, combined Figure 10 As shown, the upper end of the core pulling assembly 2 of the present invention extends from the bottom of the mold core into the interior of the mold core 5, that is, a channel for the core pulling assembly 2 to extend into is provided at the lower mold of the mold core 5. The upper end of the core pulling assembly 2 can be pushed against the upper surface of the inner cavity of the mold core, and the stroke of the core pulling assembly 2 is greater than the thickness of the injection molded product, ensuring that the core pulling assembly 2 is completely separated from the product. When the product is being molded, the upper surface is the appearance surface, which extends from the bottom, and when disengaged, the bottom is finally separated from the core pulling assembly 2, which can ensure the molding effect of the upper appearance surface to the greatest extent. Accordingly, if the lower surface is the appearance surface, the core pulling assembly 2 can also be inserted from top to bottom into the inner cavity of the mold core 5.

[0054] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A dynamic core pulling mechanism for a mold, characterized in that: include: A slider (1) capable of linear translation relative to the mold core along a first direction, wherein a guide rail (11) is provided on the slider (1); A core pulling assembly (2) is slidably mounted on the mold core along the second direction, and the core pulling assembly (2) is slidably mounted on the guide rail (11). When the guide rail (11) moves along the first direction with the slider (1), the core pulling assembly (2) is driven to translate along the second direction. The end of the core-pulling assembly (2) can extend into the inner cavity of the mold core, dividing the inner cavity of the mold core into two cavities, each cavity being used for injection of a different material; the core-pulling assembly (2) is used to separate the two materials during the filling process and to pull them out of the mold core during the pressure holding process.

2. The dynamic core pulling mechanism of the mold according to claim 1, characterized in that: The first direction is perpendicular to the second direction, and the length direction of the guide rail (11) is at an angle to the first direction.

3. The dynamic core pulling mechanism of the mold according to claim 2, characterized in that: A slot is provided on the slider (1), and the guide rail (11) is provided in the slot.

4. The dynamic core pulling mechanism of the mold according to claim 2, characterized in that: The guide rail (11) is a flat plate, and a sliding channel matching the guide rail (11) is provided on the core pulling assembly (2).

5. The dynamic core pulling mechanism of the mold according to claim 1, characterized in that: A guide block (12) is provided on the slider (1), and the guide block (12) is used to slide in cooperation with the sliding groove on the mold core.

6. The dynamic core pulling mechanism of the mold according to claim 1, characterized in that: The core pulling assembly (2) comprises a movable block (21) and an insert (22), wherein the insert (22) is detachably assembled on the movable block (21); the movable block (21) moves relative to the slider (1), and the insert (22) is used to extend into the mold core.

7. The dynamic core pulling mechanism of the mold according to claim 1, characterized in that: The slider (1) is provided with a driver (3), and the driver (3) is used to drive the slider (1) to translate along a first direction.

8. The dynamic core pulling mechanism of the mold according to claim 7, characterized in that: It also includes a sensor (4), which is used to detect the position of the slider (1), and the driver (3) controls the stroke according to the detection signal of the sensor (4).

9. The dynamic core pulling mechanism of the mold according to claim 1, characterized in that: The slider (1) is linear, U-shaped or "mountain" shaped, and two or more guide rails (11) are provided on the slider (1), thereby driving two or more core pulling assemblies (2) to move simultaneously.

10. The dynamic core pulling mechanism of the mold according to claim 1, characterized in that: The end of the core-pulling component (2) extends from the bottom of the mold core into the mold core, and the stroke of the core-pulling component (2) is greater than the thickness of the injection molded product.

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