Macro core-pulling mechanism in injection mold

Abstract

The utility model discloses a micro-distance core-pulling mechanism in an injection mold, which is characterized in that inclined surfaces are arranged on the peripheral surfaces of a left sliding block and a right sliding block which are provided with sliding block limiting holes; an inner inclined wall which can be in relative sliding contact with the inclined surface is arranged on the inner peripheral wall of the sinking groove of the core insert in which the left sliding block and the right sliding block are embedded and corresponds to the inclined surface; the left sliding block and the right sliding block are arranged in a sliding groove formed in the female die core in a sliding mode, a female die limiting hole formed in the female die core corresponding to the sliding block limiting hole and the sliding block limiting hole are coaxially formed before die assembly, and the female die limiting hole and the sliding block limiting hole are not coaxially formed during die assembly. The waist part of the limiting flicking needle with small middle and two large ends is provided with a thin part and a thick part; the head of the elastic needle is arranged in the sliding block limiting hole, the bottom and the thick portion of the elastic needle are arranged in the female die limiting hole, and the thin portion of the elastic needle is arranged in the female die limiting hole and the sliding block limiting hole simultaneously. According to the mechanism, micro-distance core pulling with the side face core pulling distance smaller than 0.5 mm of a product can be achieved, eight mold cavities of an injection mold can be distributed, and the productivity of the mold is greatly improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of injection molds, in particular to a micro-core pulling mechanism implemented inside an injection mold. Background Art

[0002] At present, in the injection mold industry, the status quo is that injection molds use a universal standard core pulling mechanism. Figure 1 As shown, the slide 10 of this universal standard core-pulling mechanism is relatively large and located externally to the mold cores (female mold core 20 and male mold core 30). This makes it suitable for products with a core-pulling distance greater than 1mm. For some products with side core-pulling distances less than 0.5mm, this universal standard core-pulling mechanism is not suitable. Furthermore, this universal standard core-pulling mechanism not only suffers from the problem of extending the core-pulling mechanism to the outside of the mold core, resulting in a long working stroke, but also occupies a large area of the mold core, limiting the mold core to only two or four cavities, resulting in a relatively small number of cavities, which seriously affects production capacity.

[0003] In summary, the current application of universal standard core pulling mechanisms faces significant bottlenecks in expanding the application scope and production capacity of injection molds. To overcome these technical difficulties, it is urgent to develop a solution with a wider application range, further improved production capacity, and greater market competitiveness. Utility Model Content

[0004] In order to solve the problems existing in the prior art, the utility model provides a macro core pulling mechanism inside an injection mold. The macro core pulling mechanism can not only realize macro core pulling with a side core pulling distance of less than 0.5mm for the product, but also realize an eight-cavity arrangement of the mold cavity of the injection mold, thereby greatly improving the mold production capacity and enhancing the market competitiveness of the product.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A micro-pitch core pulling mechanism inside an injection mold, comprising a slider assembly and a limiting spring pin built into the male mold core and the female mold core of the injection mold; wherein,

[0007] The slider assembly includes a left slider and a right slider, each of which is provided with a slider limiting hole, and the outer peripheral surfaces of the left slider and the right slider are both provided with an inclined surface; the left slider and the right slider are embedded in a recessed groove of the male mold core, and the inner peripheral wall of the recessed groove is provided with an inner inclined wall corresponding to the inclined surface and capable of relative sliding contact with the inclined surface;

[0008] The left slider and the right slider are slidably arranged in the slide groove provided on the mother mold core, and the mother mold core is provided with a mother mold limiting hole corresponding to the slider limiting hole; the mother mold limiting hole and the slider limiting hole are coaxially arranged before the mold is closed, and the mother mold limiting hole and the slider limiting hole are not coaxially arranged when the mold is closed;

[0009] The limiting spring pin is composed of a spring pin head, a spring pin waist, and a spring pin bottom in sequence; the outer diameter of the spring pin waist is smaller than the outer diameters of the spring pin bottom and the outer diameters of the spring pin head; the spring pin waist is composed of a thin part connected to the spring pin head and a thick part connected to the spring pin bottom, and the outer diameter of the thin part is smaller than the outer diameter of the thick part;

[0010] The head of the assembled limiting pin is placed in the limiting hole of the slider, the bottom of the limiting pin and the thick part of the pin waist are both placed in the limiting hole of the mother mold, and the thin part of the pin waist is placed in the limiting hole of the mother mold and the limiting hole of the slider at the same time.

[0011] In the above-described internal macro core-pulling mechanism of an injection mold, the slider limiting hole formed in the left slider is composed of a left slider limiting hole and a left slider guide hole that are interconnected and coaxial, and the slider limiting hole formed in the right slider is composed of a right slider limiting hole and a right slider guide hole that are interconnected; the master mold limiting hole formed corresponding to the left slider limiting hole of the left slider is composed of a left master mold limiting hole and a left master mold guide hole that are interconnected and coaxial, and the master mold limiting hole formed corresponding to the right slider limiting hole of the right slider is composed of a right master mold limiting hole and a right master mold guide hole that are interconnected and coaxial;

[0012] The head of the assembled limiting spring pin is placed in the limiting hole of the left slider and the limiting hole of the right slider; the bottom of the limiting spring pin is placed in the guide hole of the left mother mold and the guide hole of the right mother mold; the thick part and the thin part of the waist of the spring pin are placed in the limiting hole of the left mother mold and the limiting hole of the right mother mold, and the thin part of the waist of the spring pin is placed in the limiting hole and the guide hole of the left slider, and the limiting hole and the guide hole of the right slider at the same time.

[0013] The technical solution provided above has the following beneficial effects:

[0014] First, the internal macro core pulling mechanism of the injection mold of the utility model sets the mother mold limiting hole of the wire mold core and the slider limiting hole of the slider assembly on the same axis before the mold is closed, and sets them on different axes when the mold is closed. The limiting spring pin is designed to be a shape with a small middle and large ends that is easier to deform elastically. In addition, the detailed setting of smaller outer diameter can achieve macro core pulling with a side core pulling distance of less than 0.5mm for the product.

[0015] Secondly, the female mold core and the male mold core of the injection mold using the micro-core pulling mechanism of the utility model are relatively small in size. Based on the design requirements of the same type of mold base and double-sided slider core pulling, the mold cavities in the mold core frame can be arranged with eight cavities, which significantly improves the mold production capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0017] Figure 1 This is a schematic diagram of the structure of the core pulling mechanism of the conventional injection mold;

[0018] Figure 2 This is a schematic diagram of the top view of the micro-core pulling mechanism inside the injection mold of the utility model;

[0019] Figure 3 yes Figure 2 AA cross-sectional structure diagram (mother mold and male mold are in the mold closing state);

[0020] Figure 4 It is a cross-sectional structural diagram of the female mold core and the male mold core of the micro-core pulling mechanism inside the injection mold of the utility model in the mold opening state;

[0021] Figure 5 yes Figure 4 Schematic diagram of the enlarged structure of part C;

[0022] Figure 6 It is a schematic diagram of the main structure of the limiting spring pin of the utility model.

[0023] Figure 7 The utility model is a schematic diagram of the arrangement structure of eight female mold cores and eight male mold cores assembled into a mold core frame. DETAILED DESCRIPTION

[0024] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clear and understandable, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0025] In the claims, description and the above-mentioned drawings of the present utility model, unless otherwise clearly defined, the use of terms such as "first", "second" or "third" is to distinguish different objects rather than to describe a specific order.

[0026] In the claims, specification and the above-mentioned drawings of the present utility model, unless otherwise expressly defined, directional words, such as the terms "center", "transverse", "longitudinal", "horizontal", "vertical", "top", "bottom", "inside", "outside", "up", "down", "front", "back", "left", "right", "clockwise", "counterclockwise" and the like, indicating directions or positional relationships are based on the directions and positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the specific protection scope of the present utility model.

[0027] In the claims, specification and the above drawings of the present utility model, unless otherwise clearly defined, if the terms "fixed connection" or "fixed connection" are used, they should be understood in a broad sense, that is, any connection method without any displacement relationship and relative rotation relationship between the two parties, that is to say, including non-detachable fixed connection, detachable fixed connection, integral connection and fixed connection through other devices or elements.

[0028] In the claims, description and drawings of the present utility model, if the terms "include", "have" and their variations are used, they are intended to mean "including but not limited to".

[0029] Now combined Figures 2 to 6 As shown, the utility model describes a micro-core pulling mechanism inside an injection mold, which includes a slider assembly 100 and a limiting spring pin 200. The slider assembly 100 and the limiting spring pin 200 are built into the male mold core 300 and the female mold core 400 of the injection mold.

[0030] The slider assembly 100 of the present invention includes a left slider 110 and a right slider 120. Each of the left and right sliders 110 and 120 has an inclined surface on its outer circumference, forming a left outer inclined surface 111 on the outer circumference of the left slider 110 that slides within the male mold core 300, and a right outer inclined surface 121 on the outer circumference of the right slider 120 that slides within the male mold core 300. Furthermore, both the left and right sliders 110 and 120 are provided with slider-limiting holes. The slider-limiting holes formed in the left slider 110 are composed of a left slider-limiting hole 112 and a left slider guide hole 113 that are interconnected and coaxial, while the slider-limiting holes formed in the right slider 120 are composed of a right slider-limiting hole 122 and a right slider guide hole 123 that are interconnected. The left slider guide hole 113 and the right slider guide hole 123 ensure that the limiting spring pin 200 can smoothly penetrate into the left slider limiting hole 112 and the right slider limiting hole 122 during assembly.

[0031] Correspondingly, the male mold core 300 of the present invention is provided with a recessed groove 310, into which the left and right sliders 110 and 120 are embedded. Furthermore, the inner circumferential wall of the recessed groove 310 is provided with an inner slanted wall 311 corresponding to the inclined surfaces of the left and right sliders 110 and 120. During assembly, the inclined surfaces of the left and right sliders 110 and 120 can slide relative to each other with the inner slanted wall 311. Specifically, the inner circumferential wall of the recessed groove 310 is provided with an inner slanted wall 311 corresponding to the left outer slanted surface 111 and right outer slanted surface 121 of the left and right sliders 110 and 120. The inner slanted wall 311 can slide relative to each other with the left and right outer slanted surfaces 111 and 121 when the slider assembly 100 is assembled on the male mold core 300.

[0032] The female mold core 400 of the present invention is provided with a slide groove 410. The left and right sliders 110, 120, embedded in the male mold core 300, can slide simultaneously left and right within the slide groove 410, thereby enabling the left and right sliding movements of the left and right sliders 110, 120 within the male mold core 300. Furthermore, female mold limiting holes are provided in the female mold core 400 corresponding to the slider limiting holes of the slider assembly 100. The female mold limiting hole formed corresponding to the left slider limiting hole 112 of the left slider 110 is composed of a left female mold limiting hole 420 and a left female mold guide hole 430, which are interconnected and coaxial. The female mold limiting hole formed corresponding to the right slider limiting hole 122 of the right slider 120 is composed of a right female mold limiting hole 440 and a right female mold guide hole 450, which are interconnected and coaxial. The left mother mold guide hole 430 and the right mother mold guide hole 450 ensure that the limiting spring pin 200 can smoothly penetrate into the left mother mold limiting hole 420 and the right mother mold limiting hole 440 during assembly.

[0033] In the present invention, the female mold limiting holes and the slider limiting holes are coaxially arranged before the female mold core 400 and the male mold core 300 are in a closed position. Specifically, the left female mold limiting hole 420 and the left female mold guide hole 430 are coaxially arranged with the left slider limiting hole 112 and the left slider guide hole 113 before the female mold core 400 and the male mold core 300 are in a closed position; the right female mold limiting hole 440 and the right female mold guide hole 450 are coaxially arranged with the right slider limiting hole 122 and the right slider guide hole 123 before the female mold core 400 and the male mold core 300 are in a closed position.

[0034] The mother mold limiting hole and the slider limiting hole of the utility model are set at different axes when the mother mold core 400 and the male mold core 300 are molded together, so as to achieve micro core pulling with a side core pulling distance of less than 0.5mm. Specifically, when the mother mold core 400 and the male mold core 300 are molded together, the left mother mold limiting hole 420 and the left mother mold guide hole 430 are in a different axis state than the left slider limiting hole 112 and the left slider guide hole 113, forming a misalignment; the right mother mold limiting hole 440 and the right mother mold guide hole 450 are in a different axis state than the right slider limiting hole 122 and the right slider guide hole 123, forming a misalignment. Please refer to Figure 3 As shown, in this embodiment, the left mother mold limiting hole 420 and the left mother mold guide hole 430 are offset by 0.15mm from the left slider limiting hole 112 and the left slider guide hole 113 when the mother mold core 400 and the male mold core 300 are clamped; the right mother mold limiting hole 440 and the right mother mold guide hole 450 are offset by 0.15mm from the right slider limiting hole 122 and the right slider guide hole 123 when the mother mold core 400 and the male mold core 300 are clamped.

[0035] The limiting spring pin 200 of the present invention is sequentially composed of a spring pin head 210, a spring pin waist 220, and a spring pin bottom 230. The outer diameter of the spring pin waist 220 is smaller than the outer diameter of the spring pin bottom 230 and the outer diameter of the spring pin head 210, so as to form a shape that is smaller in the middle and larger at both ends, which is easier to elastically deform. Furthermore, the spring pin waist 220 is composed of a thin portion 221 connected to the spring pin head 210 and a thick portion 222 connected to the spring pin bottom 230, and the outer diameter of the thin portion 221 is smaller than the outer diameter of the thick portion 222. The thin portion 221 with a smaller outer diameter is formed in the spring pin waist 220 of the present invention, which can further effectively improve the elastic deformation coefficient of the local area of the limiting spring pin 200 and increase the deformation space of the limiting spring pin 200, ensuring that the short limiting spring pin 200 can achieve deformation and rebound action within a small range.

[0036] During assembly, the left slider 110 and the right slider 120 are first assembled into the slide groove 410 of the mother mold core 400, and then the limiting spring pin 200 is assembled into the mother mold limiting hole of the mother mold core 400 and the slider limiting hole of the slider assembly 100. The spring pin head 210 of the assembled limiting spring pin 200 is placed in the slider limiting hole, the spring pin bottom 230 of the limiting spring pin 200 and the thick part 222 of the spring pin waist 220 are both placed in the mother mold limiting hole, and the thin part 221 of the spring pin waist 220 is placed in the mother mold limiting hole and the slider limiting hole at the same time. Specifically, the limiting spring pin 200 can be assembled in the mother mold limiting hole of the mother mold core 400 while slightly moving the left slider 110 and the right slider 120, so that the spring pin head 210 of the limiting spring pin 200 is first pushed into the left slider guide hole 113 and the right slider guide hole 123, and then the limiting spring pin 200 is continued to be pushed so that the spring pin head 210 of the limiting spring pin 200 is in the left slider limiting hole 112 and the right slider limiting hole 122, so that the spring pin bottom 230 of the limiting spring pin 200 is gap-fitted in the left mother mold guide hole 430 and the right mother mold guide hole 450 of the mother mold core 400, and the thick part 222 and the thin part 221 of the spring pin waist 220 are gap-fitted in the mother mold. The left mother mold limiting hole 420 and the right mother mold limiting hole 440 of the core 400 are located in the left mother mold. At the same time, the detailed clearance of the elastic pin waist 220 fits in the left slider limiting hole 112 and the left slider guide hole 113 of the left slider 110 and the right slider 120, as well as the right slider limiting hole 122 and the right slider guide hole 123; at this time, due to the positioning of the limiting elastic pin 200, the left mother mold limiting hole 420 and the left mother mold guide hole 430 are in a coaxial state with the left slider limiting hole 112 and the left slider guide hole 113; the right mother mold limiting hole 440 and the right mother mold guide hole 450 are in a coaxial state with the right slider limiting hole 122 and the right slider guide hole 123.

[0037] Whenever the female mold core 400 and the male mold core 300 are closed, the inner inclined wall of the male mold core 300 will contact and press against the left outer inclined surface 111 and the right outer inclined surface 121 of the left slider 110 and the right slider 120, so that the female mold limiting hole of the female mold core 400 and the corresponding slider limiting holes of the left slider 110 and the right slider 120 are in different axial states. In this embodiment, the limiting spring pin 200 with a small middle and large ends, coupled with the smaller outer diameter detail 221, can make the female mold limiting hole of the female mold core 400 and the corresponding slider limiting holes of the left slider 110 and the right slider 120 have a slight misalignment of 0.15mm. After the female mold core 400 and the male mold core 300 are opened, the male mold core 300 is removed, and the left slider 110 and the right slider 120 are deformed and rebounded by the limiting spring pin 200, and the female mold limiting hole of the female mold core 400 and the corresponding slider limiting holes of the left slider 110 and the right slider 120 are restored to the coaxial state.

[0038] When assembling the mold, first assemble the eight pieces of the female mold core 400 and the male mold core 300 into the mold. Figure 7 In the mold frame 500 shown, eight mold points are arranged within it (first mold point 510, second mold point 520, third mold point 530, fourth mold point 540, fifth mold point 550, sixth mold point 560, seventh mold point 570, and eighth mold point 580). The horizontal center-to-center spacing between mold cavities is 54 mm (reference value), and the vertical center-to-center spacing between cavities is 33 mm (reference value). (Note: The minimum distance between cavity boundaries requires space for runners, ensuring a 4 mm safety margin on each side of the main runner and a 2 mm safety margin on each side of the branch runner.) By modifying the mold point layout of the mold frame 500 within the same mold base, eight-cavity production can be achieved by using the mold core with the micro-core pulling mechanism within the injection mold of the present invention.

[0039] The foregoing description illustrates and describes preferred embodiments of the present invention. As previously stated, the present invention is not limited to the form disclosed herein and should not be construed as excluding other embodiments. Rather, the present invention is applicable to various other combinations, modifications, and environments and is capable of modification within the scope of the present invention as described herein, through the teachings above, or through techniques or knowledge in the relevant art. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention are intended to be protected by the claims appended hereto.

Claims

1. A micro core pulling mechanism inside an injection mold, characterized in that: It comprises a slider assembly (100) and a limiting spring pin (200) built into a male mold core (300) and a female mold core (400) of an injection mold; wherein, A slider assembly (100) comprises a left slider (110) and a right slider (120) both provided with slider limiting holes, wherein the outer peripheral surfaces of the left slider (110) and the right slider (120) are provided with inclined surfaces; the left slider (110) and the right slider (120) are embedded in a sink groove (310) of a male mold core (300), and the inner peripheral wall of the sink groove (310) is provided with an inner inclined wall (311) corresponding to the inclined surface and capable of relative sliding contact with the inclined surface; The left slider (110) and the right slider (120) are slidably arranged in a slide groove (410) provided on the mother mold core (400), and the mother mold core (400) is provided with a mother mold limiting hole corresponding to the slider limiting hole; the mother mold limiting hole and the slider limiting hole are coaxially arranged before the mold is closed, and the mother mold limiting hole and the slider limiting hole are not coaxially arranged when the mold is closed; The limiting elastic pin (200) is sequentially composed of an elastic pin head (210), an elastic pin waist (220) and an elastic pin bottom (230); the outer diameter of the elastic pin waist (220) is smaller than the outer diameter of the elastic pin bottom (230) and the outer diameter of the elastic pin head (210); the elastic pin waist (220) is composed of a thin part (221) connected to the elastic pin head (210) and a thick part (222) connected to the elastic pin bottom (230); and the outer diameter of the thin part (221) is smaller than the outer diameter of the thick part (222); The pin head (210) of the assembled limiting pin (200) is placed in the limiting hole of the slider, the pin bottom (230) of the limiting pin (200) and the thick part (222) of the pin waist (220) are both placed in the limiting hole of the mother mold, and the thin part (221) of the pin waist (220) is placed in the limiting hole of the mother mold and the limiting hole of the slider at the same time.

2. The micro-pitch core-pulling mechanism inside an injection mold according to claim 1, characterized in that: exist The slider limiting hole formed in the left slider (110) is composed of a left slider limiting hole (112) and a left slider guide hole (113) that are interconnected and coaxial, and the slider limiting hole formed in the right slider (120) is composed of a right slider limiting hole (122) and a right slider guide hole (123) that are interconnected; the master mold limiting hole formed corresponding to the left slider limiting hole (112) of the left slider (110) is composed of a left master mold limiting hole (420) and a left master mold guide hole (430) that are interconnected and coaxial, and the master mold limiting hole formed corresponding to the right slider limiting hole (122) of the right slider (120) is composed of a right master mold limiting hole (440) and a right master mold guide hole (450) that are interconnected and coaxial; The pin head (210) of the assembled limiting pin (200) is placed in the limiting hole (112) of the left slider and the limiting hole (122) of the right slider; the pin bottom (230) of the limiting pin (200) is placed in the left mother mold guide hole (430) and the right mother mold guide hole (450); the thick part (222) and the thin part (221) of the pin waist (220) are placed in the left mother mold limiting hole (420) and the right mother mold limiting hole (440), and the thin part of the pin waist (220) is simultaneously placed in the left slider limiting hole (112) and the left slider guide hole (113), and the right slider limiting hole (122) and the right slider guide hole (123).

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