CN216992905U - Inner cavity reverse-buckling position demoulding mechanism of injection mould and injection mould thereof - Google Patents

Abstract

The utility model relates to an inner cavity reverse buckling position demoulding mechanism of an injection mould, which comprises: the rear mold core, the fixed insert, the sliding insert pin and the buckling position slide block; a die core hole is formed in the rear die core; the fixed insert penetrates through the die core hole, and a first insert hole is formed in the fixed insert; the sliding insert pin is arranged through the first insert pin hole, the sliding insert pin comprises a first sliding part positioned at the upper end of the sliding insert pin, and the first sliding part comprises a first inclined surface facing outwards; the buckling position sliding block comprises a second sliding part and a buckling position type block, and the first sliding part is in sliding fit with the second sliding part so that the buckling position sliding block can slide on the sliding insert pin along the direction parallel to the first inclined plane; the lower end of the buckling position sliding block is abutted against the upper end of the fixed insert, and the inner cavity inverted buckling position demoulding mechanism and the injection mould thereof can realize demoulding when the inner cavity of a product contains an inverted buckling position, and have the advantages of simple structure, short manufacturing period and low maintenance cost.

Description

Inner cavity reverse-buckling position demoulding mechanism of injection mould and injection mould thereof

Technical Field

The utility model relates to the technical field of injection molds, in particular to an inner cavity reverse-buckling position demolding mechanism of an injection mold and the injection mold.

Background

In the design process of the injection mold, the plastic product with the inner cavity often cannot be directly demolded due to the fact that the inner cavity is also provided with the back-off position, and the injection mold usually adopts an inclined top or a sliding block structure to realize tripping.

With the continuous update of products, the situations that the internal space of the product is narrow and the reverse buckling position is small can be met, if the traditional lifter or sliding block is adopted for coping, due to the complexity of the structure of the traditional lifter or sliding block, the challenges of complex mold processing and poor mold strength can be faced, and the manufacturing cost and the maintenance cost of the mold can be high; if the product is treated by a forced release method, the product may be deformed or damaged. Therefore, improvement of the inner cavity reverse-buckling position demoulding structure of the injection mould is needed.

SUMMERY OF THE UTILITY MODEL

Therefore, the utility model aims to provide the inner cavity back-off position demoulding mechanism of the injection mould, which has the advantages of capability of realizing demoulding of the injection mould under the conditions of narrow inner cavity space and small inner cavity back-off position of a product, simple structure, short manufacturing period and low manufacturing and maintenance cost.

The utility model provides an injection mold's inner chamber back-off position demoulding mechanism, injection mold includes back mould benevolence, be equipped with mould benevolence hole on the back mould benevolence, a serial communication port, include: the fixed insert, the sliding insert pin and the buckling position sliding block are arranged on the fixed insert; the fixed insert is a cylinder, the fixed insert penetrates through the die core hole and extends along the axial direction of the die core hole, and a first insert hole coaxial with the die core hole is formed in the fixed insert; the sliding insert pin penetrates through the first insert pin hole and extends along the axis direction of the first insert pin hole, the sliding insert pin comprises a first sliding part positioned at the upper end of the sliding insert pin, and the first sliding part comprises a first inclined plane facing outwards, so that the first sliding part is narrowed from bottom to top; the buckling position sliding block comprises a second sliding part and a buckling position type block, the second sliding part is located at one end, the buckling position type block is located at the other end, and the first sliding part is in sliding fit with the second sliding part and enables the buckling position sliding block to slide on the sliding insert pin along the direction parallel to the first inclined plane; the lower end of the buckling position sliding block is abutted to the upper end of the fixed insert.

The operation process of the inner cavity back-off position demoulding mechanism of the injection mould is as follows: the sliding insert pin is pulled downwards, the buckling sliding block and the sliding insert pin slide in the direction parallel to the first inclined plane due to the sliding fit relation, and the motion component of the buckling sliding block in the direction vertical to the contact surface of the upper end of the buckling sliding block and the upper end of the fixed insert is counteracted due to the fact that the upper end of the fixed insert is abutted to the lower end of the buckling sliding block, so that the buckling sliding block can only slide on the plane where the contact surface is located, and tripping is achieved; after tripping, the rear mold core moves upwards, and the product is ejected from the mechanism to realize demolding. Injection mold's inner chamber back-off position demoulding mechanism can realize the injection mold's under the narrow, less condition in inner chamber back-off position in inner chamber space inside out of a mould to still have simple structure, the preparation cycle is short, preparation and maintenance cost low advantage.

Furthermore, the quantity of the sliding insert pins and the buckling slide blocks is two, and the sliding insert pins and the buckling slide blocks are symmetrically arranged along the axis of the fixed insert. Additionally, the number and the arranged positions of the sliding insert pins and the buckling position sliding blocks can be increased, decreased and adjusted according to the number and the positions of the product reversing positions.

Furthermore, a slide rail parallel to the first inclined surface is arranged on the first sliding portion, a slide groove parallel to the first inclined surface is arranged on the second sliding portion, and the slide groove is matched with the slide rail in a sliding mode to enable the buckling position slide block to slide on the sliding insert pin along the direction parallel to the first inclined surface. Additionally, a sliding groove parallel to the first inclined surface may be formed in the first sliding portion, a sliding rail parallel to the first inclined surface may be formed in the second sliding portion, and the fastening slider may slide on the sliding insert pin in a direction parallel to the first inclined surface by cooperation of the sliding groove and the sliding rail.

Furthermore, the sliding insert pin comprises a limiting part, and the limiting part is arranged at the lower end of a sliding rail of the sliding fit mechanism and protrudes out of the upper surface of the sliding rail. The limiting part limits the lowest position which can be reached by the buckling position sliding block, and further ensures that the buckling position type block is positioned at the position of the reverse buckling position required by the formed product.

Furthermore, the mold core hole is narrowed from bottom to top, the outer wall of the fixed insert is narrowed from bottom to top, and the outer wall of the fixed insert is matched with the wall of the mold core hole. The narrowing comprises gradual narrowing and gradient narrowing, the utility model is preferably the gradient narrowing, the narrowing can limit the height of the mold core after the upper end of the fixed insert protrudes, and the height of the mold core after the upper end of the fixed insert protrudes is avoided from being too high, so that the buckling position of the product is ensured to be at the designated height, and the qualification rate of the product is ensured.

Further, a gap exists between the outer wall of the sliding insert pin and the inner wall of the fixed insert. And a gap is formed between the outer wall of the sliding insert pin and the inner wall of the fixed insert. The existence of clearance can reduce fixed mold insert and slip inlay the needle and be in the wearing and tearing of slip inlay needle in the in-process of up-and-down motion, increase of service life reduces the maintenance cost in later stage.

The utility model also provides an injection mold comprising the inner cavity back-off position demolding mechanism of any injection mold, and further comprises an inner mold, and a base, an insert fixing seat and an upward pushing seat which are sequentially arranged from bottom to top, the base can move downwards without the insert fixing seat, the base is fixed with the lower end of the sliding insert pin, the insert fixing seat is provided with an insert fixing groove, the fixed insert is fixed in the insert fixing groove, the insert fixing groove is also internally provided with a second insert hole, the push-up seat is provided with a rear mould core groove for arranging a rear mould core, the rear die core groove is internally provided with a die insert hole, the die insert fixing groove, the second pin insert hole, the die insert hole and the die core hole are coaxial, the fixed insert penetrates through the insert hole and the mold core hole in sequence from the insert fixing groove, and the sliding insert pin penetrates through the second insert pin hole and the first insert pin hole in sequence from the base.

By using the injection mold, the operation process of demoulding at the back-off position is as follows: the base is pulled downwards, the sliding insert pin is pulled to move downwards along the first insert pin hole and the second insert pin hole, the fixed insert is fixed on the insert fixing seat, the upper end of the fixed insert is abutted against the lower end of the buckling slide block, and the motion component of the buckling slide block in the vertical direction of the contact surface of the buckling slide block and the upper end of the fixed insert is counteracted, so that the buckling slide block can only slide on the plane where the contact surface is located, and tripping is realized; after tripping, the upward pushing seat moves upwards to push the rear mold core arranged in the rear mold core groove to move upwards, so that the product is ejected out.

Further, the base still includes inlays the needle fixed block, still be equipped with on the base and inlay the needle fixed slot, it fixes to inlay the needle fixed block inlay in the needle fixed slot, it will to inlay the needle fixed block the slip is inlayed the needle and is fixed in the base. The insert pin fixing block is independently arranged, so that the insert pin can be conveniently detached, maintained and replaced in the later period.

Furthermore, the lower end of the sliding insert needle is narrowed from bottom to top, a fixing hole narrowed from bottom to top is formed in the insert needle fixing block, and the lower end of the sliding insert needle penetrates through the fixing hole and is matched with the fixing hole. The narrowing can drive the insert pin to move downwards when the insert pin fixing block is pulled downwards, and the insert pin fixing block can be separated from the insert pin when moving upwards.

Further, the product inner die is connected with the upper end of the fixed insert. In one embodiment, the product inner mold is integrally connected with the fixed insert.

For a better understanding and an implementation, the present invention is described in detail below with reference to the accompanying drawings.

Drawings

FIG. 1 is a schematic cross-sectional view of a product having an internal cavity;

fig. 2 is a schematic view of an initial state of the cavity reverse-buckling position demolding mechanism of the injection mold according to embodiment 1;

fig. 3 is a schematic diagram of a releasing state of the inner cavity reverse-buckling position demoulding mechanism of the injection mould according to embodiment 1;

FIG. 4 is a front view of a sliding insert in cooperation with a clamping slide;

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

fig. 6 is a schematic structural view of an electronic cigarette cartridge injection mold of embodiment 3.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention

In the description of the present invention, it should be noted that the orientations or positional relationships indicated as the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., appear based on the orientations or positional relationships shown in the drawings only for the convenience of describing the present invention and simplifying the description, but not for indicating or implying that the referred devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Moreover, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance

In the description of the present invention, it should be noted that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" should be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1

The injection mold generally includes a front mold core and a rear mold core, and the description of the present invention does not refer to the specific structure of the front mold core, and therefore, the illustration of the front mold core is not given. As shown in fig. 1, some injection molded products will contain an inner cavity with a back-off location 1, and fig. 1 is a cross-sectional view of an e-cigarette cartridge tube.

The present embodiment provides an inner cavity back-off position demolding mechanism for an injection mold, wherein at least one mold core hole 15 is formed in a rear mold core 5 of the injection mold, and preferably, the mold core hole 15 narrows from bottom to top. The inner cavity back-off position demoulding mechanism comprises a fixed insert 6, a sliding insert pin 7 and a buckle position sliding block 4.

The fixed insert 6 is a cylinder, the fixed insert 6 passes through the mold core hole 15 and extends along the axis direction of the mold core hole 15, the fixed insert 6 is provided with a first insert hole 16 coaxial with the mold core hole 15, the first insert hole 16 can at least accommodate two sliding insert pins 7 to pass through and extend along the axis direction of the first insert hole 16, preferably, the upper end of the fixed insert 6 is matched with the mold core hole 15 to narrow from bottom to top, so as to limit the height of the upper end of the fixed insert 6 protruding out of the mold core hole 15.

The sliding insert pins 7 penetrate through the first insert pin holes 16 and extend along the axial direction of the first insert pin holes 16, and gaps exist between the outer walls of the sliding insert pins 7 and the inner walls of the fixed insert pins 6, so that abrasion caused by friction between the outer walls of the sliding insert pins 7 and the inner walls of the first insert pin holes 16 is avoided, and the service lives of the sliding insert pins 7 and the fixed insert pins 6 are prolonged; the sliding insert 7 includes a first sliding portion at an upper end thereof, and the first sliding portion includes a first inclined surface 73 facing outward to narrow the first sliding portion from bottom to top, in this embodiment, a lower end of the sliding insert 7 is narrowed from bottom to top, and in other embodiments, the lower end of the sliding insert 7 may be adjusted to a desired shape according to a connection manner of the sliding insert 7 and the base plate.

The fastening slider 4 includes a second sliding portion at one end and a fastening block 42 at the other end, the first sliding portion is in sliding fit with the second sliding portion and enables the fastening slider 4 to slide on the sliding insert 7 along a direction parallel to the first inclined surface 73, in this embodiment, the sliding fit mechanism of the second sliding portion of the fastening slider 4 and the first sliding portion of the sliding insert 7 is as shown in fig. 4 and 5, the second sliding portion is provided with a sliding slot 41, the first sliding portion is provided with a sliding rail 72, and the cooperation of the sliding slot 41 and the sliding rail 72 enables the fastening slider 4 to slide on the sliding insert 7 along a direction parallel to the first inclined surface 73; the lower end of the buckling position sliding block 4 is abutted against the upper end of the fixed insert 6; additionally, in the present embodiment, the slide insert 7 further includes a limiting portion 71, the limiting portion 71 is disposed at a lower end of the slide rail 72 of the sliding fit mechanism and protrudes from an upper surface of the slide rail 72, in an initial state, as shown in fig. 2, a lower end of the catching slide block 4 abuts against an upper end of the fixed insert 6, so that a component in a direction perpendicular to the contact surface of the catching slide block 4 can be offset from a movement of the slide block, and the lower end of the catching slide block 4 also abuts against the limiting portion 71, and the two abutments act together to ensure that the catching slide block 4 can be located at a designated position in the initial state.

The operation process of the inner cavity back-off position demoulding mechanism of the injection mould is as follows: the sliding insert pin 7 is pulled down, the buckling sliding block 4 and the sliding insert pin 7 slide on the sliding insert pin 7 along the direction parallel to the first inclined plane 73 under the guiding action of the sliding chute 41 and the sliding rail 72 due to the sliding fit relation, and the motion component of the buckling sliding block 4 in the vertical direction relative to the contact surface of the upper ends of the buckling sliding block 4 and the fixed insert 6 is counteracted due to the fact that the upper end of the fixed insert 6 is abutted against the lower end of the buckling sliding block 4, so that the buckling sliding block 4 can only slide on the plane where the contact surface is located, and in the process, the buckling block 42 is gradually far away from the back-off position 1 of the product 3 to realize tripping; after tripping, the rear mold core 5 moves upwards, and the product 3 is ejected from the mechanism by the rear mold core 5, so that demolding is realized.

Example 2

The injection mold of this embodiment includes the inner cavity back-off position demolding mechanism of embodiment 1, and further includes an inner mold 2, and a base 9, an insert fixing seat 10, and an upward pushing seat 11 that are sequentially arranged from bottom to top.

The outer side of the inner mold 2 can form the inner cavity structure required for the product 3, and the lower end thereof is connected with the fixed insert 6, and in one embodiment, the inner mold 2 is integrally connected with the fixed insert 6.

The base 9 can move downwards in a way of being separated from the insert fixing seat 10, the base 9 is fixed with the lower end of the sliding insert 7, and in one embodiment, the base 9 and the sliding insert 7 are fixed through the matching between a fixing hole 16 which is formed in the insert fixing block 8 fixed on the base 9 and is gradually narrowed from bottom to top and the lower end of the sliding insert 7 is gradually narrowed from bottom to top; the insert fixing seat 10 is provided with an insert fixing groove 13, the lower end of the fixed insert 6 is fixed in the insert fixing groove 13, in one embodiment, the fixed insert 6 and the insert fixing groove 13 are fastened through screws, and a second insert hole 12 is further arranged in the insert fixing groove 13; the push-up base 11 is provided with a die core groove for arranging the rear die core 5, and a die core hole 14 is arranged in the die core groove.

The insert fixing groove 13, the second insert hole 12, the insert hole 14 and the mold core hole 15 are coaxial, so that the fixed insert 6 can sequentially penetrate through the insert hole 14 and the mold core hole 15 from the insert fixing groove 13, the sliding insert 7 can sequentially penetrate through the second insert hole 12 and the first insert hole 16, and finally the inner cavity back-off position demolding mechanism of the injection mold is arranged in the base 9, the insert fixing seat 10 and the push-up seat 11.

The operation process of the injection mold comprises the following steps: the base 9 is pulled downwards, the sliding insert pin 7 is pulled to move downwards along the first insert pin hole 16 and the second insert pin hole 12, the fixed insert 6 is fixed on the insert fixing seat 10, the upper end of the fixed insert 6 is abutted to the lower end of the buckling slide block 4, the motion component of the buckling slide block 4 in the vertical direction of the contact surface of the buckling slide block 4 and the upper end of the fixed insert 6 is offset, the buckling slide block 4 only can slide on the plane of the contact surface, and in the process, the buckling block 42 is gradually far away from the back-off position 1 of the product 3, so that tripping is realized; after tripping, the upward pushing seat 11 moves upward to push the rear mold core 5 arranged in the mold core groove to move upward, and the product 3 is ejected out.

Example 3

As shown in fig. 5, the injection mold of the present embodiment is an injection mold for an electronic cigarette cartridge tube. The product 3 shown therein is an e-cig cartridge. The inner mould 2 is shown positioned within the inner cavity of the product 3 to form the desired inner cavity configuration of the product 3.

The structure of the injection mold of the embodiment is the same as that of the embodiment 2, in the embodiment, the insert pin fixing block 8 is fastened with the base 9 through screws, the insert pin fixing block 8 is provided with a gradient narrowing fixing hole 16 from bottom to top, the lower end of the sliding insert pin 7 is in a structure of gradient narrowing from bottom to top, the gradient narrowing fixing hole 16 from bottom to top on the insert pin fixing block 8 is matched with the structure of gradient narrowing from bottom to top at the lower end of the sliding insert pin 7, so that when the insert pin fixing block 8 moves downwards, the sliding insert pin 7 can also move downwards along with the insert pin fixing block 8, and the loss of the outer wall of the lower end of the sliding insert pin 7 and the inner wall of the fixing hole 16 can be reduced by adopting the narrowing mode. The sliding fit structure of the sliding insert pin 7 and the catching slide block 4 adopts the scheme shown in fig. 4 and 5, the second sliding part is provided with a sliding groove 41, the first sliding part is provided with a sliding rail 72, and the matching of the sliding groove 41 and the sliding rail 72 enables the catching slide block 4 to slide on the sliding insert pin 7 along the direction parallel to the first inclined surface 73; the slide insert 7 further includes a limiting portion 71, the limiting portion 71 is disposed at a lower end of a slide rail 72 of the slide fit mechanism and protrudes above an upper surface of the slide rail 72 to limit a lower sliding limit of the buckle position slider 4 on the slide rail 72, and the buckle position cavity 42 at one end of the buckle position slider 4 can form a reverse buckle position 1 required by a product.

Fig. 5 shows the injection molding, cooling, the front core is separated from the rear mold, then the base 9 moves downward, the sliding insert 7 also moves downward, the lower end of the button position slide block 4 is supported by the upper end of the fixed insert 6, the motion component of the button position slide block 4 in the vertical direction of the contact surface of the button position slide block 4 and the upper end of the fixed insert 6 is offset, the button position slide block 4 can only slide on the plane of the contact surface, the sliding process is a process of making the buckling-position block 42 of the buckling-position sliding block 4 completely separated and far away from the reverse buckling position 1, when the buckling position sliding block 4 is completely separated from the reverse buckling position 1, the base 9 stops moving, at the moment, the tripping process of the product is finished, and then the upward pushing seat 11 starts to move upwards, the upward pushing seat 11 pushes the rear mold core 5 to move upwards, and the rear mold core 5 pushes the product 3 to move upwards, so that the product 3 is separated from the inner mold 2, and the electronic cigarette bullet tube is demoulded.

Additionally, the injection mold can simultaneously produce a plurality of electronic cigarette cartridge tubes by arranging a plurality of corresponding second pin-embedding holes 12, insert fixing grooves 13, insert holes 14 and mold core holes 15 on the insert pin fixing plate 8, the insert fixing seat 10, the push-up seat 11 and the rear mold core 5 and then arranging a plurality of corresponding inner cavity back-off position demolding mechanisms, and the injection mold shown in fig. 5 can simultaneously produce 6 electronic cigarette cartridge tubes.

The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the utility model. It should be noted that, to those skilled in the art, changes and modifications may be made without departing from the spirit of the present invention, and it is intended that the present invention encompass such changes and modifications.

Claims (10)

1. The utility model provides an injection mold's inner chamber back-off position demoulding mechanism, injection mold includes back mould benevolence, be equipped with mould benevolence hole on the back mould benevolence, a serial communication port, include: the fixed insert, the sliding insert pin and the buckling position sliding block are arranged on the fixed insert;

the fixed insert is a cylinder, the fixed insert penetrates through the die core hole and extends along the axial direction of the die core hole, and a first insert hole coaxial with the die core hole is formed in the fixed insert;

the sliding insert pin penetrates through the first insert pin hole and extends along the axis direction of the first insert pin hole, the sliding insert pin comprises a first sliding part positioned at the upper end of the sliding insert pin, and the first sliding part comprises a first inclined plane facing outwards, so that the first sliding part is narrowed from bottom to top;

the buckling position sliding block comprises a second sliding part and a buckling position type block, the second sliding part is located at one end, the buckling position type block is located at the other end, and the first sliding part is in sliding fit with the second sliding part and enables the buckling position sliding block to slide on the sliding insert pin along the direction parallel to the first inclined plane; the lower end of the buckling position sliding block is abutted to the upper end of the fixed insert.

2. The inner cavity back-off position demolding mechanism for the injection mold according to claim 1, wherein the number of the sliding insert pins and the number of the back-off position sliding blocks are two and are symmetrically arranged along the axis of the fixed insert.

3. The inner cavity back-off position demolding mechanism for the injection mold according to claim 1, wherein the first sliding portion is provided with a sliding rail parallel to the first inclined surface, the second sliding portion is provided with a sliding groove parallel to the first inclined surface, and the sliding fit of the sliding groove and the sliding rail enables the back-off position sliding block to slide on the sliding insert pin in a direction parallel to the first inclined surface.

4. The inner cavity back-off position demolding mechanism for the injection mold according to claim 3, wherein the sliding insert comprises a limiting portion, and the limiting portion is arranged at the lower end of a sliding rail of the sliding fit mechanism and protrudes above the upper surface of the sliding rail.

5. The inner cavity back-off position demolding mechanism of the injection mold according to claim 1, wherein the mold core hole narrows from bottom to top, the outer wall of the fixed insert narrows from bottom to top, and the outer wall of the fixed insert is matched with the wall of the mold core hole.

6. The injection mold cavity undercut position ejection mechanism of claim 1, wherein a gap exists between an outer wall of the sliding insert and an inner wall of the fixed insert.

7. An injection mold comprising the cavity-inverted position demolding mechanism as claimed in any one of claims 1 to 6, it is characterized by also comprising an inner die, and a base, an insert fixing seat and an upper pushing seat which are arranged from bottom to top in sequence, the base can move downwards without the insert fixing seat, the base is fixed with the lower end of the sliding insert pin, the insert fixing seat is provided with an insert fixing groove, the fixed insert is fixed in the insert fixing groove, the insert fixing groove is also internally provided with a second insert hole, the push-up seat is provided with a rear mould core groove for arranging a rear mould core, the insert fixing groove, the second insert hole, the insert hole and the die core hole are coaxial, the fixed insert penetrates through the insert hole and the mold core hole in sequence from the insert fixing groove, and the sliding insert pin penetrates through the second insert pin hole and the first insert pin hole in sequence from the base.

8. The injection mold of claim 7, wherein the base further comprises an insert pin fixing block, the base further comprises an insert pin fixing groove, the insert pin fixing block is fixed in the insert pin fixing groove, and the insert pin fixing block fixes the sliding insert pin to the base.

9. The injection mold of claim 7, wherein the lower end of the sliding insert pin is narrowed from bottom to top, the insert pin fixing block is provided with a fixing hole narrowed from bottom to top, and the lower end of the sliding insert pin penetrates through the fixing hole and is matched with the fixing hole.

10. The injection mold of claim 7, wherein the inner mold is connected to an upper end of the fixed insert.

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