CN212385914U

CN212385914U - Injection mold back-off internal shrinkage structure

Info

Publication number: CN212385914U
Application number: CN202020248029.2U
Authority: CN
Inventors: 邱翌; 邬开华
Original assignee: Ningbo Lian Science And Technology Co ltd
Current assignee: Ningbo Lian Science And Technology Co ltd
Priority date: 2020-03-03
Filing date: 2020-03-03
Publication date: 2021-01-22
Anticipated expiration: 2030-03-03

Abstract

The utility model relates to the field of injection molds, in particular to an injection mold back-off retraction structure, which comprises a movable mold frame with a movable mold core, a fixed mold frame with a fixed mold core, an ejector plate with a reset mechanism, a sliding block component and a back-off component; the sliding block assembly obliquely penetrates through the movable die frame and is in sliding fit with the movable die frame, one end of the sliding block assembly is flexibly connected with the ejector plate, the other end of the sliding block assembly is fixedly connected with the reversing assembly, and the reversing assembly is provided with a protruding part which is matched with the female corner side of the reversing part; in the injection mold closing state, the movable mold core, the bulge part inside the movable mold core and the fixed mold core form a cavity; in the mold splitting state of the injection mold, the back-off component moves towards the direction far away from the movable mold core and the bulge part moves towards the direction far away from the back-off part; according to the technical scheme, the technical problems that when the products with the inverted buckle parts are subjected to batch injection molding by the transmission injection mold, demolding is difficult and the products are easy to damage are solved.

Description

Injection mold back-off internal shrinkage structure

Technical Field

The utility model relates to an injection mold field specifically relates to a structure contracts in injection mold back-off.

Background

When a product with a reverse buckling part (as shown in fig. 1) is finished, demolding is troublesome, a complicated demolding mechanism needs to be designed, and meanwhile, the product is damaged during demolding, so that the reject ratio of the product is easy to reduce.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a structure contracts in injection mold back-off is provided, this technical scheme solved transmission injection mold and moulded plastics in batches when having the product of back-off portion, the technical problem of drawing of patterns difficulty, fragile product.

In order to solve the technical problem, the utility model provides a following technical scheme:

an injection mold back-off retraction structure is applied to injection molding products, an L-shaped back-off part which protrudes upwards vertically and is then turned over horizontally is arranged at the top of the products, and the injection mold comprises a movable mold frame with a movable mold core, a fixed mold frame with a fixed mold core, an ejector plate with a reset mechanism, a sliding block assembly and a back-off assembly; the sliding block assembly obliquely penetrates through the movable die frame and is in sliding fit with the movable die frame, one end of the sliding block assembly is flexibly connected with the ejector plate, the other end of the sliding block assembly is fixedly connected with the reversing assembly, and the reversing assembly is provided with a protruding part which is matched with the female corner side of the reversing part; in the injection mold closing state, the movable mold core, the bulge part inside the movable mold core and the fixed mold core form a cavity; and under the mold splitting state of the injection mold, the back-off component moves towards the direction far away from the movable mold core and the bulge moves towards the direction far away from the back-off part.

Preferably, a plurality of concave dies are arranged on the movable die core, a plurality of convex dies are arranged on the fixed die core, the concave dies correspond to the convex dies one by one, the sliding block assemblies correspond to the back-off assemblies one by one, every two back-off assemblies correspond to one concave die, two adjacent back-off assemblies are symmetrically arranged relative to the symmetrical surface of the same concave die, and the two back-off assemblies in the same concave die move towards the direction away from the concave die and towards the direction close to or away from each other in the mold splitting state of the injection mold.

Preferably, a first insert located between the ejector plate and the movable mold core is fixedly installed in the movable mold base, an avoiding opening for avoiding the sliding block assembly is formed in the movable mold base, and the movable mold core and the first insert are in sliding fit with the sliding block assembly.

Preferably, the ejector plate is fixedly provided with a second insert corresponding to each sliding block assembly one by one towards the movable die core, one side of the second insert towards the movable die core is provided with a groove which horizontally penetrates through the second insert, the groove is a T-shaped groove, one end of each sliding block assembly is located inside the corresponding groove, and the two sides of each sliding block assembly are provided with protruding parts which can slide in the corresponding groove.

Preferably, the protruding portion includes a roller and rollers, the roller penetrates through the slider assembly, the rollers are disposed on two sides of the slider assembly and mounted at two ends of the roller, and an outer circumferential surface of the roller abuts against an inner wall of the groove in the horizontal direction.

Preferably, the roller and the slider assembly are one piece, and the roller is a micro bearing.

Compared with the prior art, the utility model beneficial effect who has is:

after the movable mould frame and the fixed mould frame are assembled, the movable mould core and the fixed mould core are combined, a concave mould is arranged on the movable mould core, a convex mould is arranged on the fixed mould core, the back-off component is a vertical convex part in the concave mould, the convex part is a horizontal convex part on the vertical convex part, a cavity inside the combined movable mould core and the fixed mould core forms a cavity for product forming, and the back-off component and the convex part form a back-off for forming the back-off part; after the product injection moulding, movable mould frame and cover half frame divide the mould, the movable mould frame moves towards the direction of keeping away from the cover half frame, the product moves along with movable mould benevolence, the thimble board stops moving under the effect of retainer, slider assembly's one end is driven by the thimble board, make it slope on the movable mould frame and slide, slider assembly's other end drive back-off subassembly moves towards drawing of patterns direction, back-off subassembly moves towards the direction of keeping away from movable mould benevolence, the direction of keeping away from back-off portion of bellying orientation removes simultaneously, and then make bellying and back-off portion break away from, the product is extruded in the driven mould benevolence of back-off subassembly simultaneously, when the compound die once more, canceling release mechanism makes the thimble board reset, reset mechanism can be for spring guide pillar or return pin, the thimble board resets and drives.

The mold can be used for batch injection molding of products with the inverted buckle parts, and is simple in demolding and not easy to damage the products.

Drawings

FIG. 1 is a perspective view of a product;

FIG. 2 is a perspective view of the injection mold of the present invention in a mold closing state;

fig. 3 and 4 are perspective views of two different viewing angles of the split state of the injection mold of the present invention;

FIG. 5 is an enlarged view of a portion of FIG. 4 at A;

FIG. 6 is a side view of the movable mold frame of the present invention in a mold closing state;

FIG. 7 is a sectional view taken along line B-B of FIG. 6;

FIG. 8 is an enlarged view of a portion of FIG. 7 at C;

FIG. 9 is an enlarged view of a portion of FIG. 7 at D;

FIG. 10 is a side view of the movable mold frame of the present invention in a mold-splitting state;

FIG. 11 is a sectional view taken along line E-E of FIG. 10;

FIG. 12 is an enlarged view of a portion of FIG. 11 at F;

FIG. 13 is an enlarged view of a portion of FIG. 11 at G;

the reference numbers in the figures are:

1-product; 1 a-a back-off portion;

2-moving the die carrier; 2 a-a movable mould core; 2 b-a first insert; 2 c-avoiding the opening;

3-fixing a mould frame; 3 a-fixing the mold core;

4-ejector pin plate; 4 a-a reset mechanism; 4 b-a second insert; 4b 1-groove;

5-a slider assembly; 5 a-a roller; 5 b-a roller;

6-a back-off assembly; 6 a-boss.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, 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 merely illustrative of the invention and are not intended to limit the invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

An injection mold undercut draw-in structure is applied to an injection molding product 1, as shown in fig. 1, the product 1 is in a thin flat plate shape, an L-shaped undercut part 1a which protrudes upwards vertically and is then turned over horizontally is arranged at the top of the product 1, as shown in fig. 2, 3, 4 and 5, the injection mold comprises a movable mold frame 2 with a movable mold core 2a, a fixed mold frame 3 with a fixed mold core 3a, an ejector plate 4 with a reset mechanism 4a, a slide block assembly 5 and an undercut assembly 6;

the sliding block assembly 5 obliquely penetrates through the movable die frame 2 and is in sliding fit with the movable die frame 2, one end of the sliding block assembly 5 is flexibly connected with the ejector plate 4, the other end of the sliding block assembly 5 is fixedly connected with the back-off assembly 6, and the back-off assembly 6 is provided with a protruding part 6a matched with the internal corner side of the back-off part 1 a; in the injection mold closing state, the movable mold core 2a, the bulge part 6a in the movable mold core and the fixed mold core 3a form a cavity; in the mold splitting state of the injection mold, the back-off component 6 moves towards the direction far away from the movable mold core 2a and the protrusion 6a moves towards the direction far away from the back-off part 1 a.

After the movable mould frame 2 and the fixed mould frame 3 are assembled, the movable mould core 2a and the fixed mould core 3a are combined, a concave mould is arranged on the movable mould core 2a, a convex mould is arranged on the fixed mould core 3a, the back-off component 6 is a vertical convex part in the concave mould, the bulge part 6a is a horizontal convex part on the vertical convex part, a cavity inside the movable mould core 2a and the fixed mould core 3a after being combined forms a cavity for forming the product 1, and the back-off component 6 and the bulge part 6a form a back-off for forming the back-off part 1 a; after the product 1 is injection molded, the movable mold frame 2 and the fixed mold frame 3 are separated, the movable mold frame 2 moves towards the direction far away from the fixed mold frame 3, the product 1 moves along with the movable mold core 2a, the ejector plate 4 stops moving under the action of the stop piece, one end of the slide block component 5 is driven by the ejector plate 4 to enable the slide block component to tilt and slide on the movable mold frame 2, the other end of the slide block component 5 drives the back-off component 6 to move towards the demolding direction, the back-off component 6 moves towards the direction far away from the movable mold core 2a, and meanwhile, the bulge part 6a moves towards the direction far away from the back-off part 1a, so that the convex part 6a is separated from the back-off part 1a, meanwhile, the product 1 is extruded from the driven die core 2a by the back-off component 6, when the die is closed again, the reset mechanism 4a resets the ejector plate 4, the reset mechanism 4a can be a spring guide post or a return pin, and the ejector plate 4 resets to drive the sliding block assembly 5 and the reversing assembly 6 to reset.

During demolding, the product 1 may also be ejected by an ejector pin mounted on the ejector plate 4, or the product 1 may be ejected by both the ejector pin and the reversing component 6, and the specific embodiment is not limited.

The injection mold is characterized in that a plurality of female molds are arranged on the movable mold core 2a, a plurality of male molds are arranged on the fixed mold core 3a, the female molds correspond to the male molds one by one, the sliding block assemblies 5 correspond to the back-off assemblies 6 one by one, every two back-off assemblies 6 correspond to one female mold, the two adjacent back-off assemblies 6 are symmetrically arranged relative to the symmetrical surface of the same female mold, and the two back-off assemblies 6 in the same female mold move towards the direction away from the female molds and towards the direction close to or away from each other under the mold splitting state of the injection mold.

Each female die and each male die are used for combining into a cavity for forming a product 1, and each cavity is internally provided with two back-off assemblies 6; as shown in fig. 1, the top of the product 1 is provided with a pair of inverted portions 1a which are symmetrical to each other with respect to the symmetrical plane of the product 1, and the female corner faces of the inverted portions 1a are disposed to face each other, so that the inverted assembly 6 is required to move in a direction away from the die and in a direction approaching each other at the time of die release, and if the male corner faces of the inverted portions 1a are disposed to face each other, the inverted assembly 6 is required to move in a direction away from the die and in a direction away from each other at the time of die release;

as shown in fig. 6 to 13, a first insert 2b located between the ejector plate 4 and the movable mold core 2a is fixedly installed in the movable mold frame 2, an avoiding opening 2c for avoiding the slide block assembly 5 is formed in the movable mold frame 2, and the movable mold core 2a and the first insert 2b are both in sliding fit with the slide block assembly 5.

The movable die core 2a and the first insert 2b are provided with chutes for guiding the sliding block assemblies 5 to slide obliquely, and the chutes enable one ends of the pair of sliding block assemblies 5 applied to the same female die to be close to each other at the ends where the back-off assemblies 6 are installed when the sliding block assemblies slide towards the direction where the fixed die frame 3 is close to each other.

One side of the ejector plate 4 facing the movable die core 2a is fixedly provided with second insert 4b corresponding to each slide block assembly 5 one to one, one side of the second insert 4b facing the movable die core 2a is provided with a groove 4b1 horizontally penetrating through the second insert 4b, the groove 4b1 is a T-shaped groove, one end of each slide block assembly 5 is located inside the groove 4b1, and two sides of each slide block assembly 5 are provided with protruding parts capable of sliding in the grooves 4b 1.

The second insert 4b sandwiches upper and lower surfaces of the projecting portion by the groove 4b1 so that the slider assembly 5 moves vertically along with the second insert 4b, while the end of the slider assembly 5 provided with the projecting portion can move horizontally in the groove 4b1 so that the slider assembly 5 can reciprocate obliquely under the drive of the ejector plate 4.

The protruding portion includes a roller 5a and rollers 5b, the roller 5a penetrates through the slider assembly 5, the rollers 5b are disposed on two sides of the slider assembly 5 and are mounted on two ends of the roller 5a, and the outer circumferential surface of the roller 5b abuts against the inner wall of the groove 4b1 in the horizontal direction.

Roller 5a and roller 5b convert the sliding engagement of the projection with groove 4b1 to a rolling engagement between roller 5b and groove 4b1, greatly reducing the friction between groove 4b1 and the projection.

The roller 5a and the slider assembly 5 are an integral piece, and the roller 5b is a micro-bearing.

The roller 5a and the slider assembly 5 are in a single piece, so that the roller 5a and the slider assembly 5 are difficult to separate, the problem that the roller 5a is difficult to move in the groove 4b1 due to the fact that the end face of the roller 5a abuts against the inner wall of the groove 4b1 when the roller moves axially relative to the slider assembly 5, and large friction force is generated is solved, and the roller 5b has excellent radial bearing force and extremely small rolling friction force.

The utility model discloses a theory of operation:

after the movable mould frame 2 and the fixed mould frame 3 are assembled, the movable mould core 2a and the fixed mould core 3a are combined, a concave mould is arranged on the movable mould core 2a, a convex mould is arranged on the fixed mould core 3a, the back-off component 6 is a vertical convex part in the concave mould, the bulge part 6a is a horizontal convex part on the vertical convex part, a cavity inside the movable mould core 2a and the fixed mould core 3a after being combined forms a cavity for forming the product 1, and the back-off component 6 and the bulge part 6a form a back-off for forming the back-off part 1 a;

after the product 1 is injection molded, the movable mold frame 2 and the fixed mold frame 3 are separated, the movable mold frame 2 moves towards the direction far away from the fixed mold frame 3, the product 1 moves along with the movable mold core 2a, the ejector plate 4 stops moving under the action of the stop piece, one end of the slide block component 5 is driven by the ejector plate 4,

the second insert 4b clamps the upper and lower surfaces of the roller 5b through the groove 4b1, so that the slide assembly 5 moves vertically along with the second insert 4b, and the roller 5b can horizontally roll in the groove 4b1, so that the slide assembly 5 can obliquely reciprocate along the movable mold core 2a and the inclined grooves formed on the first insert 2b under the driving of the ejector plate 4;

the other end of the sliding block component 5 drives the back-off component 6 to move towards the demoulding direction, the back-off component 6 moves towards the direction far away from the movable mould core 2a, and meanwhile, the bulge 6a moves towards the direction far away from the back-off part 1a, so that the bulge 6a is separated from the back-off part 1a, and meanwhile, the product 1 is extruded from the movable mould core 2a by the back-off component 6;

when the mold is closed again, the reset mechanism 4a resets the ejector plate 4, the reset mechanism 4a can be a spring guide post or a return pin, and the ejector plate 4 resets to drive the sliding block assembly 5 and the reversing assembly 6 to reset.

Claims

1. An injection mold inverted buckle retraction structure is applied to an injection molding product (1), an L-shaped inverted buckle part (1a) which protrudes upwards vertically and is then turned over horizontally is arranged at the top of the product (1), and the injection mold comprises a movable mold frame (2) with a movable mold core (2a), a fixed mold frame (3) with a fixed mold core (3a), an ejector pin plate (4) with a reset mechanism (4a), a sliding block assembly (5) and an inverted buckle assembly (6); the device is characterized in that a sliding block component (5) obliquely penetrates through a movable mould frame (2) and is in sliding fit with the movable mould frame (2), one end of the sliding block component (5) is flexibly connected with an ejector plate (4), the other end of the sliding block component (5) is fixedly connected with a back-off component (6), and the back-off component (6) is provided with a protruding part (6a) which is inosculated with the internal corner side of a back-off part (1 a);

in the injection mold closing state, the movable mold core (2a), the bulge (6a) inside the movable mold core and the fixed mold core (3a) form a cavity;

under the mould splitting state of the injection mould, the back-off component (6) moves towards the direction far away from the movable mould core (2a) and the bulge part (6a) moves towards the direction far away from the back-off part (1 a).

2. An injection mold undercut draw-in structure according to claim 1, characterized in that, the movable mold core (2a) is provided with a plurality of female molds, the stationary mold core (3a) is provided with a plurality of male molds, the female molds correspond to the male molds one by one, the slider assemblies (5) correspond to the undercut assemblies (6) one by one, every two undercut assemblies (6) correspond to one female mold, two adjacent undercut assemblies (6) are symmetrically arranged with respect to the symmetry plane of the same female mold, and in the mold parting state of the injection mold, the two undercut assemblies (6) in the same female mold face away from the female mold and move toward the direction close to or away from each other.

3. An injection mold undercut draw-in structure according to claim 1, characterized in that, a first insert (2b) between the ejector plate (4) and the movable mold core (2a) is fixedly installed in the movable mold base (2), an avoiding opening (2c) for avoiding the slide block assembly (5) is provided on the movable mold base (2), and the movable mold core (2a) and the first insert (2b) are both in sliding fit with the slide block assembly (5).

4. An injection mold undercut draw-in structure according to claim 1, characterized in that one side of the ejector plate (4) facing the moving core (2a) is fixedly provided with a second insert (4b) corresponding to each slide block assembly (5), one side of the second insert (4b) facing the moving core (2a) is provided with a groove (4b1) horizontally penetrating through the second insert (4b), the groove (4b1) is a T-shaped groove, one end of the slide block assembly (5) is located inside the groove (4b1), and two sides of the slide block assembly (5) are provided with protrusions capable of sliding in the groove (4b 1).

5. An injection mold undercut structure as claimed in claim 4, wherein the protrusion comprises a roller (5a) and a roller (5b), the roller (5a) penetrates through the slider assembly (5), the rollers (5b) are disposed on both sides of the slider assembly (5) and are installed on both ends of the roller (5a), and the outer circumferential surface of the roller (5b) abuts against the inner wall of the groove (4b1) in the horizontal direction.

6. An injection mould undercut structure as claimed in claim 5, wherein the roller (5a) and the slider assembly (5) are one piece, and the roller (5b) is a micro-bearing.