Demolding assembly for I-shaped inverted buckle on inner side of product

Abstract

The demolding assembly for the I-shaped inverted buckle on the inner side of the product comprises a front mold, a rear mold, an ejector plate and a bottom plate, an inclined ejection cavity and a sliding groove are formed in the rear mold, and a through ejector rod through hole is further formed in the bottom of the inclined ejection cavity; a large pitched roof, a small sliding block and a core-pulling sliding block are mounted on the rear mold side in a sliding manner, the core-pulling sliding block is mounted in the sliding groove and is driven by an inclined guide column on the front mold to move, and a deflector rod is fixedly mounted on one side, facing the large pitched roof, of the core-pulling sliding block. The large pitched roof is installed in the pitched roof cavity, a containing groove is formed in the side, facing the core pulling sliding block, of the large pitched roof, the small sliding block is installed in the containing groove in a sliding mode, and a deflector rod through hole matched with the deflector rod is formed in the small sliding block; and an ejector rod is fixedly mounted at the bottom of the large inclined ejector, downwards penetrates through the rear mold and the ejector plate in sequence and then is connected to the sliding base in a sliding manner through a first T-shaped block. The structure is simple, arrangement of the core pulling assembly is reduced, and the internal occupied space is reduced; and meanwhile, complete back-off demolding is guaranteed, the product yield is increased, and the injection molding efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of undercut demoulding of injection molds, and in particular to a demoulding component with an I-shaped undercut on the inner side of a product. Background Art

[0002] Existing injection molding products come in a variety of forms. Often, according to actual production and processing requirements, many products require undercuts with functional functions during molding, such as Figure 1 and Figure 2 As shown, I-shaped undercuts are provided on two opposite side walls inside the product cavity structure. After the product is injection molded, demoulding is required without damaging the product. Conventional undercut demoulding often adopts the core pulling demoulding method. However, one of the side walls of the opening end of the product is made with a flange structure inward, which hinders the overall running direction of the core pulling. If the core pulling demoulding is continued, it is easy to cause damage to the lower part of the product, resulting in demoulding failure, affecting the overall quality of the product, low product yield, and low injection molding efficiency. Summary of the invention

[0003] The purpose of the present invention is to solve the deficiencies of the above-mentioned prior art and to provide a demoulding component with an I-shaped undercut on the inner side of a product.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: the demoulding assembly with an I-shaped undercut on the inner side of the product includes a front mold, a rear mold, an ejector plate and a bottom plate, wherein the front mold and the rear mold can be relatively opened and closed to form a product injection cavity, the ejector plate is located below the rear mold, and the bottom plate is located below the ejector plate. A large inclined ejector, a small slider and a core-pulling slider are slidably installed on the side of the rear mold, and correspondingly, an inclined ejector cavity and a sliding groove are provided on the rear mold, and the two are interconnected, wherein the bottom of the inclined ejector cavity is provided with an ejector rod through hole that penetrates the rear mold.

[0005] The core-pulling slider is slidably installed in the sliding groove, and is provided with an inclined guide column through hole. Correspondingly, an inclined guide column is fixedly installed on the front mold and slidably inserted into the corresponding inclined guide column through hole; a lever is fixedly installed on the side of the core-pulling slider facing the large inclined top.

[0006] The above-mentioned large inclined top is slidably installed in the inclined top cavity, and a built-in accommodating groove is provided on the side facing the core-pulling slider, and the small slider is slidably installed in the accommodating groove, and a first I-shaped undercut forming groove is formed between its top and the large inclined top; the small slider is provided with a lever through hole matched with the above-mentioned lever, and the above-mentioned lever is slidably inserted in the corresponding lever through hole; the bottom of the large inclined top is fixedly installed with an ejector rod, and the ejector rod is slidably installed in the corresponding ejector rod through hole, and passes through the rear mold and the ejector plate downward in turn, and a first T-block is fixedly installed at the bottom end; a sliding base is provided between the ejector plate and the bottom plate, and is fixedly installed at the bottom of the ejector plate, and a first T-slot set at an inclined angle is provided on the sliding base, and the above-mentioned first T-block is slidably installed in the first trapezoidal groove.

[0007] Furthermore, sliding grooves are symmetrically arranged on the two side walls of the sliding groove on the rear mold, and a pressure plate is fixedly installed in the sliding groove by countersunk bolts. The width of the pressure plate is larger than the sliding groove, and a guide sliding groove is formed between the pressure plate and the sliding groove, and a guide block is fixedly installed at the bottom of the sliding groove, which is consistent with the direction of the guide sliding groove.

[0008] One-piece sliders are fixedly installed on both sides of the core-pulling slider, and the sliders are slidably installed in the corresponding guide slots; a guide slot is provided at the bottom of the core-pulling slider, and is slidably mounted on the guide block.

[0009] Furthermore, the lever is fixedly arranged to be tilted downward, and is fixedly mounted on the core-pulling slider by means of a limiting pressure block and a corresponding countersunk bolt.

[0010] Furthermore, the small slider includes a molding block in the upper half and a base in the lower half, which are integrally formed and embedded in the above-mentioned accommodating groove as a whole, and its outer side surface is flush with the outer side wall of the large slanted top; the molding block is provided with the same number as the above-mentioned first I-shaped inverted molding grooves, and its longitudinal cross-section is triangular, and the first I-shaped inverted molding groove is formed between the top of the molding block and the large slanted top.

[0011] A second T-shaped slot is provided on the side of the base in the small sliding block facing the large inclined top, and correspondingly, a second T-shaped block adapted to the second T-shaped slot is provided on the inner side wall of the accommodating slot in the large inclined top.

[0012] Furthermore, a second I-shaped inverted buckle forming groove is also provided at the top of the large slanted top, which is located on the opposite side of the above-mentioned first I-shaped inverted buckle forming groove; a sliding through hole is provided in the large slanted top below the second I-shaped inverted buckle forming groove, and an inlay pin is installed inside the large slanted top, and the top end of the inlay pin is the inner molding block of the second I-shaped inverted buckle forming groove, and together with the large slanted top, it forms a complete I-shaped inverted buckle forming groove, and the bottom end of the inlay pin is fixed to the large slanted top by a countersunk bolt.

[0013] Furthermore, the ejector plate is provided with a through long strip slot, the ejector rod passes through the corresponding long strip slot, and the length direction of the long strip slot is the same as the setting direction of the first T-slot on the lower sliding base.

[0014] Furthermore, the lever through hole provided on the small slider is inclined downward, with the end close to the large inclined top being lower and the end close to the core-pulling slider being higher.

[0015] Compared with the prior art, the present invention has the following beneficial effects: the present invention has a simple structure, reduces the setting of the demolding structure in the conventional mold, reduces the setting of the core pulling component, reduces the occupied space and the overall mold volume; at the same time, the setting of the small slider can prevent the demolding and adhesion of the I-shaped undercut, ensure its complete undercut demolding effect, improve the product yield, and improve the injection molding efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of the molded product targeted by the present invention;

[0017] Figure 2 for Figure 1 A magnified view of the structure of part A;

[0018] Figure 3 This is a schematic diagram of the overall structure of the demoulding assembly of the present invention being arranged on a mold;

[0019] Figure 4 This is a schematic diagram of the rear mold side structure of the present invention (mainly focusing on the location of the demoulding component);

[0020] Figure 5 It is a structural schematic diagram of the rear mold in the present invention (mainly focusing on the location of the demoulding component);

[0021] Figure 6 It is an assembly relationship diagram of the core-pulling slider and the large inclined top in the present invention;

[0022] Figure 7 for Figure 6 A longitudinal central section view of the middle structure;

[0023] Figure 8 The schematic diagram of the running track of the demoulding component of the present invention when opening the mold, wherein: ① is the running track diagram of the core-pulling slider, ② is the running track diagram of the large inclined top, and ③ is the running track diagram of the small slider;

[0024] Fig. 9 It is a schematic diagram of the overall structure of the core-pulling slider in the present invention;

[0025] Fig.10 It is a schematic diagram of the structure of the large inclined roof and its drive in the present invention;

[0026] Fig.11It is a schematic diagram of the structure of the large inclined top accommodating the small sliding block side in the present invention;

[0027] Fig.12 It is a structural schematic diagram of the small slider in the present invention;

[0028] In the figure: A0, first I-shaped undercut, A1, second I-shaped undercut, A2, flanging;

[0029] 1. Front mold, 2. Rear mold, 3. Ejector plate, 4. Bottom plate, 5. Core-pulling slider, 6. Oblique guide column, 7. Large oblique ejector, 8. Small slider, 9. Sliding base, 10. Ejector rod, 11. Push rod, 12. First T-block, 13. Inlay pin, 21. Sliding groove, 22. Oblique ejector cavity, 23. Slide groove, 24. Press plate, 25. Guide block, 26. Ejector rod through hole, 31. Long strip slot, 51. Slider, 52. Oblique guide column through hole, 71. First I-shaped undercut forming groove, 72. Second I-shaped undercut forming groove, 73. Accommodating groove, 74. Second T-block, 75. Brass oiling groove, 81. Forming block, 82. Base, 83. Second T-slot, 84. Push rod through hole, 91. First T-slot. DETAILED DESCRIPTION

[0030] It should be noted that, in the description of the present invention, terms such as "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are relational words determined only for the convenience of describing the structural relationships of the various components in the present invention, and do not specifically mean that any component in the present invention must have a specific direction, be constructed and operated in a specific direction, and should not be understood as a limitation on the present invention.

[0031] In addition, in the invention, the descriptions such as "first" and "second" are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the invention. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features.

[0032] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings:

[0034] A demoulding component with an I-shaped undercut on the inner side of a product, mainly for Figure 1 and Figure 2 In the product structure shown in FIG, a first I-shaped undercut A0 and a second I-shaped undercut A1 are provided on the inner side wall of the cavity structure of the molded product, and are integrally injection molded with the product. Figures 3 to 7 As shown, the demoulding assembly includes a front mold 1, a rear mold 2, an ejector plate 3 and a bottom plate 4, wherein the front mold 1 and the rear mold 2 can open and close relative to each other, and form a product injection cavity when the molds are closed; the ejector plate 3 is located below the rear mold 2, and includes an ejector panel and an ejector bottom plate, wherein the ejector panel is located on the upper surface of the ejector bottom plate; the bottom plate 4 is located below the ejector plate 3, and is spaced apart from the ejector plate 3. The upper surface of the above-mentioned rear mold 2 is provided with a sliding groove 21 and an inclined top cavity 22, which are arranged at a position facing the cavity structure of the product. The sliding groove 21 and the inclined top cavity 22 are connected to each other, and the inclined top cavity 22 is located at the rear side of the sliding groove 21; the left and right vertical side walls of the sliding groove 21 are provided with mutually symmetrical sliding grooves 23, and a pressing plate 24 is fixedly installed above the sliding groove 23 by countersunk bolts. The width of the pressing plate 24 is greater than the width of the sliding groove 23, so that its inner edge extends out of the sliding groove 23 and forms a guiding sliding groove with the sliding groove 21; a sliding groove is fixedly installed at the center of the bottom surface of the sliding groove 21 along the sliding groove 23. A rectangular guide block 25 is provided in the length direction; a core-pulling slider 5 is slidably installed in the sliding groove 21, and an integrally formed slider 51 is fixedly provided on the left and right sides of the core-pulling slider 5, which are respectively placed in the guide sliding grooves on the corresponding sides, and a guide groove adapted to the guide block 25 is provided on the bottom surface of the core-pulling slider 5, and the core-pulling slider 5 is slidably installed in the sliding groove 21 through the cooperation of the two; an inclined guide post through hole 52 is also provided on the core-pulling slider 5, and correspondingly, an inclined guide post 6 is fixedly installed at the bottom of the front mold 1, and the inclined guide post 6 can be slidably inserted into the corresponding inclined guide post through hole 52. At the same time, combined with Fig. 9 As shown, two mutually parallel and spaced shifting rods 11 are fixedly installed on the rear end side of the core-pulling slider 5 through a limiting pressure block and its matching countersunk bolts, and the shifting rods 11 are arranged to be inclined downward.

[0035] A large inclined ejector 7 is slidably installed in the inclined ejector cavity 22. The bottom of the inclined ejector cavity 22 is provided with an ejector rod through hole 26 that passes through the upper and lower rear mold 2. A guide sleeve is fixedly installed in each ejector rod through hole 26. An ejector rod 10 is fixedly installed at the bottom of the large inclined ejector 7. The ejector rod 10 passes through the rear mold 2 and the ejector plate 3 downward in sequence, and a first T-shaped block 12 is fixedly installed at its lower end. Fig.11 As shown, the side of the large inclined top 7 facing the core-pulling slider 5 is provided with a receiving groove 73, and a small slider 8 is slidably installed in the receiving groove 73, as shown in FIG. Fig.12 As shown, the small slider 8 includes an integrally formed base 82 and a forming block 81, wherein two forming blocks 81 are provided, and their longitudinal cross-sections are triangular in shape, respectively located at the top of both ends of the base 82, and adapted to the above-mentioned accommodating groove 73. A second T-block 74 arranged in the up-and-down direction is also fixedly installed at the center position of the inner side wall of the accommodating groove 73. A second T-slot 83 slidably adapted to the above-mentioned second T-block 74 is provided at the center of one side of the base 82 facing the large inclined top 7 in the small slider 8, and a brass oiling groove 75 is fixedly installed on the inner side wall of the accommodating groove 73 to reduce the sliding friction damage between the small slider 8 and the large inclined top 7; when the small slider 8 is in the mold closing state, it is embedded in the above-mentioned accommodating groove 73 as a whole, and its outer side surface is flush with the outer side wall of the large inclined top 7, and the top of the forming block 81 in the small slider 8 and the large inclined top 7 just form a first I-shaped undercut forming groove 71. The base 82 of the small slider 8 is also provided with a lever through hole 84 that is compatible with the above-mentioned lever 11, which is also inclined, with the end close to the large inclined top 7 being lower and the end close to the core-pulling slider 5 being higher. The lever 11 set on the above-mentioned core-pulling slider 7 can be slidably inserted into the corresponding lever through hole 84.

[0036] A sliding base 9 is also provided between the ejector plate 3 and the bottom plate 4, and is located directly below the ejector rod 10. The sliding base 9 is fixedly mounted on the bottom surface of the ejector plate 3 by countersunk bolts, and a first T-shaped groove 91 is provided thereon. Fig.10 As shown, the first T-slot 91 is inclined, and the first T-block 12 at the bottom end of the ejector rod 10 is slidably installed in the corresponding first T-slot 91; at the same time, the ejector plate 3 is provided with a long strip slot 31 running through its thickness, and its length direction is set in the same direction as the first T-slot 91, corresponding to the ejector rod 10, and the ejector rod 10 passes through the long strip slot 31.

[0037] The top of the above-mentioned large slanted top 7 is also provided with a second I-shaped undercut forming groove 72 that is compatible with the second I-shaped undercut A1 on the product, which is located on the opposite side of the first I-shaped undercut forming groove 71, and is also provided with two; corresponding to the lower part of the second I-shaped undercut forming groove 72, the interior of the large slanted top 7 is provided with a sliding through hole, and a pin 13 is installed inside the pin 13 through bolts and springs, and the top of the pin 13 is the inner molding block of the second I-shaped undercut forming groove 72, and a complete second I-shaped undercut forming groove 72 is formed between the large slanted top 7.

[0038] When in use, the specific working principle is as follows: when the product is demoulded after injection molding, the front mold 1 and the rear mold 2 perform a mold opening action, the rear mold 2 does not move, and the front mold 1 moves upward, thereby driving the inclined guide column 6 fixed thereon to move upward, such as Figure 8In the vertical motion track shown in ①, since the inclined guide column 6 is set at an inclined angle, it moves vertically upward, thereby driving the core-pulling slider 5 to move horizontally to the left along the sliding groove 21 on the rear mold 2; continue to combine Figure 8 The movement trajectory shown in ③, in which the horizontal direction is the movement direction of the core-pulling slider 5, thereby driving the oblique lever 11 fixed thereon to move horizontally to the left. Since the lever 11 is set at an oblique downward angle, along with its horizontal movement to the left, it drives the small slider 8 to slide in the accommodating groove 73, and at the same time is limited by the sliding of the second T-block 74 and the second T-slot 83, so that the small slider 8 slides vertically downward, first disengaging from the above-mentioned first I-shaped undercut A0 to prevent it from sticking; then the ejector plate 3 is ejected upward, driving the sliding base 9 to move upward synchronously, and since the first T-slot 91 thereon is set at an inclined angle, the first T-block 12 inside it slides downward along it, driving the ejection rod 10 to slide downward, thereby driving the large oblique ejector 7 to perform a core-pulling movement downward, so that the first I-shaped undercut forming groove 71 and the second I-shaped undercut forming groove 72 at the top thereof are respectively separated from the corresponding first I-shaped undercut A0 and second I-shaped undercut A1 on the product, thereby realizing the demoulding of the above-mentioned product. At the same time, the bottom of the small slider 8 is set at an inclined angle, and the side close to the core-pulling slider 5 is slightly higher. A guide slider is fixedly installed to avoid mold damage caused by collision with the upper flange A2 of the product, thereby ensuring the molding integrity of the product and improving its product quality.

[0039] The relevant technical features not mentioned or described in the above embodiments can be realized by adopting or drawing on the relevant technical solutions in the prior art; and the setting of the structure inside the overall mold is set according to the production and processing requirements of the actual product, and only the Figure 2 The demoulding of the I-shaped undercut in the cavity structure of the product is described here, and other mold structures are not described here.

[0040] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. The demoulding assembly with an I-shaped undercut on the inner side of the product comprises a front mold, a rear mold, an ejector plate and a bottom plate, wherein the front mold and the rear mold can be relatively opened and closed to form a product injection cavity, the ejector plate is located below the rear mold, and the bottom plate is located below the ejector plate, and is characterized in that: A large inclined top, a small slider and a core-pulling slider are slidably mounted on the side of the rear mold, and correspondingly, an inclined top cavity and a sliding groove are provided on the rear mold, and the two are connected to each other, wherein a through hole for a push rod penetrating the rear mold is provided at the bottom of the inclined top cavity; The core-pulling slider is slidably installed in the sliding groove, and is provided with an inclined guide column through hole. Correspondingly, an inclined guide column is fixedly installed on the front mold and slidably inserted into the corresponding inclined guide column through hole; a lever is fixedly installed on the side of the core-pulling slider facing the large inclined top; The above-mentioned large inclined top is slidably installed in the inclined top cavity, and a built-in accommodating groove is provided on the side facing the core-pulling slider, and the small slider is slidably installed in the accommodating groove, and a first I-shaped undercut forming groove is formed between its top and the large inclined top; the small slider is provided with a lever through hole matched with the above-mentioned lever, and the above-mentioned lever is slidably inserted in the corresponding lever through hole; the bottom of the large inclined top is fixedly installed with an ejector rod, and the ejector rod is slidably installed in the corresponding ejector rod through hole, and passes through the rear mold and the ejector plate downward in turn, and a first T-block is fixedly installed at the bottom end; a sliding base is provided between the ejector plate and the bottom plate, and is fixedly installed at the bottom of the ejector plate, and a first T-slot set at an inclined angle is provided on the sliding base, and the above-mentioned first T-block is slidably installed in the first trapezoidal groove.

2. The demoulding assembly with an I-shaped undercut on the inner side of the product according to claim 1, characterized in that: The two side walls of the sliding groove on the rear mold are symmetrically provided with sliding grooves, and a pressing plate is fixedly installed in the sliding groove by countersunk bolts. The width of the pressing plate is larger than the sliding groove, and a guide sliding groove is formed between the pressing plate and the sliding groove, and a guide block is fixedly installed at the bottom of the sliding groove, which is consistent with the direction of the guide sliding groove; One-piece sliders are fixedly installed on both sides of the core-pulling slider, and the sliders are slidably installed in the corresponding guide slots; a guide slot is provided at the bottom of the core-pulling slider, and is slidably mounted on the guide block.

3. The demoulding assembly with an I-shaped undercut on the inner side of the product according to claim 2, characterized in that: The lever is fixedly arranged in an oblique downward tilt, and is fixedly mounted on the core-pulling slider by a limiting pressure block and a corresponding countersunk bolt.

4. The demoulding assembly with an I-shaped undercut on the inner side of the product according to claim 1, characterized in that: The small slider includes a forming block of the upper half and a base of the lower half, which are integrally formed and embedded in the above-mentioned accommodating groove as a whole, and its outer side surface is flush with the outer side wall of the large inclined top; the forming block is provided with the same number as the first I-shaped undercut forming grooves, and its longitudinal cross-section is triangular, and the first I-shaped undercut forming groove is surrounded by the top of the forming block and the large inclined top; A second T-shaped slot is provided on the side of the base in the small sliding block facing the large inclined top, and correspondingly, a second T-shaped block adapted to the second T-shaped slot is provided on the inner side wall of the accommodating slot in the large inclined top.

5. The demoulding assembly with an I-shaped undercut on the inner side of the product according to claim 4, characterized in that: The top of the large slanted top is also provided with a second I-shaped inverted buckle forming groove, which is located on the opposite side of the above-mentioned first I-shaped inverted buckle forming groove; a sliding through hole is provided in the large slanted top below the second I-shaped inverted buckle forming groove, and an inlay pin is installed inside the large slanted top, and the top of the inlay pin is the inner molding block of the second I-shaped inverted buckle forming groove, and together with the large slanted top, it forms a complete I-shaped inverted buckle forming groove, and the bottom end of the inlay pin is fixed to the large slanted top by a countersunk bolt.

6. The demoulding assembly with an I-shaped undercut on the inner side of the product according to claim 1, characterized in that: The ejector plate is provided with a through long strip slot, and the ejector rod passes through the corresponding long strip slot. The length direction of the long strip slot is the same as the setting direction of the first T-slot on the lower sliding base.

7. The demoulding assembly with an I-shaped undercut on the inner side of the product according to claim 1, characterized in that: The lever through hole arranged on the small slider is arranged to be tilted downward, with the end close to the large inclined top being lower and the end close to the core-pulling slider being higher.

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