CN214214575U - Injection mould - Google Patents

Abstract

The utility model provides an injection mold, include: the male die core is provided with a downwards-sunken insert accommodating cavity and a first web groove; the female die core is arranged above the male die core and is provided with an insert accommodating hole which is positioned above the insert accommodating cavity and penetrates through the thickness direction of the female die core; the lower surface of the cavity insert is also provided with a sliding chute leading to the insert accommodating hole; the runner insert penetrates through the insert accommodating hole from the upper part of the female die core and is inserted into the insert accommodating cavity; the retractable sliding block is arranged in the sliding groove in a reciprocating sliding mode and is provided with a positioning portion and a back-off forming portion, the positioning portion is used for being matched with the tiger's mouth groove to position the back-off forming portion, the back-off forming portion is used for inserting the runner insert and extends downwards into the insert accommodating cavity from the insert accommodating hole to define a product cavity together with the cavity wall of the insert accommodating cavity and the runner insert. The utility model discloses a carry out institutional advancement to injection mold, improved injection mold's the mode of taking off the back-off, the structure is retrencied, occupies smallly.

Description

Injection mould

Technical Field

The utility model relates to a mould especially relates to injection mold.

Background

The injection mold is a tool for producing plastic products with fixed shapes, and in the injection molding process, plastic melted by heating is injected into a product cavity in the injection mold and is cooled and solidified to obtain a molded product.

Inside back-off structure that has of some plastic products, partial injection mold among the prior art, adopt the mould to push up to one side and the slider auxiliary structure as the shaping back-off each other usually, however, some plastic products whole volume ratio is smaller, and the distance is very near between a plurality of back-offs, this can lead to lacking sufficient space among the injection mold and arrange slider and mould to push up to one side, even arrange slider and mould to push up to one side in injection mold reluctantly, also can lead to the whole volume of injection mold great, the structure is complicated, still can influence the normal removal of slider and mould when taking off the back-off, lead to taking off the degree of difficulty increase of back-off, lead to the product to produce the damage when taking off the back-off very easily.

Therefore, how to improve the structure of the injection mold to change the way of releasing the undercut is a technical problem to be solved urgently by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an injection mold who solves above-mentioned problem at least partially.

The utility model discloses a further purpose improves injection mold's structure to it takes off the back-off mode to change it.

The utility model discloses a further purpose is to simplify injection mold's structure, reduces injection mold's volume.

The utility model provides an injection mold, include: the male die core is provided with a downwards-sunken insert accommodating cavity and a first web groove; the female die core is arranged above the male die core and is provided with an insert accommodating hole which is positioned above the insert accommodating cavity and penetrates through the thickness direction of the female die core; the lower surface of the cavity insert is also provided with a sliding chute leading to the insert accommodating hole; the runner insert penetrates through the insert accommodating hole from the upper part of the female die core and is inserted into the insert accommodating cavity; the retractable sliding block is arranged in the sliding groove in a reciprocating sliding mode and is provided with a positioning portion and a back-off forming portion, the positioning portion is used for being matched with the tiger's mouth groove to position the back-off forming portion, the back-off forming portion is used for inserting the runner insert and extends downwards into the insert accommodating cavity from the insert accommodating hole to define a product cavity together with the cavity wall of the insert accommodating cavity and the runner insert.

Optionally, the insert receiving cavity is cylindrical; the radius of the cross section of the insert accommodating cavity is equal to or larger than the hole radius of the insert accommodating hole; the runner insert is cylindrical, the central axis of the runner insert is coaxial with the central axis of the insert accommodating cavity and the central axis of the insert accommodating hole, the radius of the cross section of the runner insert positioned in the insert accommodating cavity is smaller than that of the cross section of the insert accommodating cavity, and the radius of the cross section of the runner insert positioned in the insert accommodating hole is equal to the hole radius of the insert accommodating hole.

Optionally, the sliding groove extends inwards from the outer periphery of the cavity insert to the insert accommodating hole along the horizontal direction; the inward-contracting sliding block is provided with a sliding part which is embedded into the sliding groove and slides along the sliding groove, and the inverted buckle forming part is connected to one end, facing the runner insert, of the sliding part; the runner insert is provided with a sliding cavity communicated with the sliding groove and used for the inverted buckle forming part to extend into, and an injection molding runner communicated with the product cavity.

Optionally, the sliding cavity extends inwards from the side wall of the runner insert along the horizontal direction, and when the positioning portion is matched with the tiger mouth groove, in the extending direction of the sliding cavity, the distance between the inverted buckle forming portion and the cavity wall of the sliding cavity is greater than a set threshold value, so that when the positioning portion is separated from the tiger mouth groove, the inverted buckle forming portion is driven by the sliding portion to move inwards along the sliding cavity, and the inverted buckle forming portion is completely separated from the product inverted buckle cavity.

Optionally, the depth of the sliding groove is the same as the thickness of the sliding part; a gap is reserved between the positioning part and the inverted buckle forming part, and the positioning part is formed by downwards protruding from the lower surface of the end section of the sliding part; the lower surface of the cavity insert is also provided with a tiger's mouth matched with the tiger's mouth groove, and the thickness of the tiger's mouth is the same as that of the positioning part.

Optionally, the first web comprises a first web and a second web, the first web and the second web are symmetrically arranged on two sides of the sliding groove relative to the length extension direction of the sliding groove, and the distance between the first web and the second web is smaller than the width of the sliding groove; when the positioning part is matched with the first web groove, the positioning part is positioned between the first web groove and the second web groove, the surface of the positioning part facing the runner insert is an inclined surface, and the inclined surface is coplanar with the surfaces of the first web groove and the second web groove facing the runner insert.

Optionally, the injection mold further comprises: the fixed block is fixedly arranged on the cavity insert and is positioned on one side of the retracted slide block back to the runner insert; the fixed block is provided with a first fixed part assembled on the sliding groove and a second fixed part protruding downwards from the lower surface of the first fixed part; and one end of the spring is connected with the fixed block, the other end of the spring is connected with the inward-contracting sliding block, and when the positioning part is matched with the tiger's mouth groove, the spring is in a compressed state.

Optionally, the surface of the inward-retracting slider, which faces away from the runner insert, forms a vertical surface attached to the fixed block.

Optionally, the spring extends and retracts in the horizontal direction and is embedded in the fixed block and the inward-retracting sliding block.

Optionally, two sliding grooves are respectively arranged on two sides of the insert accommodating hole; the number of the inward-contracting sliding blocks is two, and each inward-contracting sliding block can be arranged in one sliding chute in a reciprocating sliding manner; and the number of the web openings is four, and every two web openings are arranged corresponding to one web opening groove.

The utility model discloses an injection mold, including public mould benevolence, cavity benevolence, runner mold insert and the interior slider that contracts, public mould benevolence has the mold insert and holds chamber and tiger mouth groove, and the cavity benevolence sets up in public mould benevolence top, and it has the mold insert accommodation hole that runs through the thickness direction and is formed at the lower surface and accesss to the spout of mold insert accommodation hole. The runner insert penetrates through the insert accommodating hole of the female mold core and then is inserted into the insert accommodating cavity of the male mold core, the inward-contracting sliding block is arranged in the sliding groove in a reciprocating sliding mode and provided with a positioning part and an inverted-buckle forming part, the inverted-buckle forming part can be positioned through the positioning part, and the inverted-buckle forming part is inserted into the runner insert to limit a product cavity with the cavity wall of the insert accommodating cavity and the runner insert. The utility model discloses a carry out institutional advancement to injection mold, improved injection mold's the mode of taking off the back-off, the slider that contracts in will having back-off shaping portion sets up in the spout of cavity benevolence, because the slider that contracts in can follow spout reciprocating sliding, when the location portion breaks away from the tiger mouth groove, the slider that contracts in can follow the spout and slide so that back-off shaping portion breaks away from the product back-off die cavity to realize taking off the back-off, whole process is very simple.

Further, the utility model discloses an injection mold, the slider that contracts in can assemble in the spout of cavity benevolence through the sliding part, and can inject the position of back-off shaping portion through location portion, and this structure that is favorable to simplifying injection mold reduces injection mold's volume.

The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.

Drawings

Some specific embodiments of the present invention will be described in detail hereinafter, by way of illustration and not by way of limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:

fig. 1 is a sectional view of a partial structure of an injection mold in a mold clamping state according to an embodiment of the present invention;

FIG. 2 is a schematic view of a product being processed by an injection mold according to an embodiment of the present invention;

FIG. 3 is a schematic view of a partial structure of the injection mold shown in FIG. 1 in a clamped state;

FIG. 4 is a schematic view of a core insert of the injection mold shown in FIG. 1;

FIG. 5 is a bottom view of the cavity insert of the injection mold shown in FIG. 1, illustrating a bottom structure of the cavity insert;

FIG. 6 is a schematic view of a retracting slide of the injection mold shown in FIG. 1;

FIG. 7 is a schematic view of the female mold core and the retracted slide of the injection mold of FIG. 1;

fig. 8 is a schematic view of a partial structure of the injection mold shown in fig. 1 in an open state.

Detailed Description

Fig. 1 is a sectional view of a partial structure of an injection mold 10 in a mold clamping state according to an embodiment of the present invention, and fig. 2 is a schematic view of a product processed by the injection mold 10 according to an embodiment of the present invention. The injection mold 10 of the present embodiment can be applied to injection molding of a cylindrical product, and is particularly suitable for a small cylindrical product having an undercut 103 at its inner opening.

In the injection molding process, the injection mold 10 of the present embodiment adopts a backward glue injection manner. The injection mold 10 may generally include a core insert 200, a cavity insert 300, a runner insert 400, and a retraction slide 500, and may further include a fixing block 600, a spring 700, an a plate 800, and a B plate 900. The plane of the dotted line in fig. 1 shows the open-close plane between the a plate 800 and the B plate 900. The core insert 200, the runner insert 400, and the retraction slide 500 together define a product cavity 101.

The cavity 300 is disposed above the core 200. The core insert 200 and the cavity insert 300 may be substantially rectangular, the thickness direction of the core insert 200 and the cavity insert 300 may be substantially vertical, and the length direction and the width direction of the core insert 200 and the cavity insert 300 may be substantially horizontal, for example, the length direction may be substantially a transverse extending direction, and the width direction may be substantially a front-back extending direction. The upper surface of the core insert 200 and the lower surface of the cavity 300 may be substantially in the horizontal plane, and in the closed state, the upper surface of the core insert 200 may be attached to the lower surface of the cavity 300.

Fig. 3 is a schematic diagram of a part of the injection mold 10 shown in fig. 1 in a mold closing state, and fig. 4 is a schematic diagram of a core insert 200 in the injection mold 10 shown in fig. 1.

The core insert 200 has a downwardly concave insert-receiving cavity 210 and a tiger's mouth groove 220. The insert-receiving cavity 210 and the tiger groove 220 may be formed recessed downward from the upper surface of the core insert 200. The insert receiving cavity 210 may be located in the middle of the core insert 200, and the two tiger slot 220 may be disposed on two sides of the insert receiving cavity 210, for example, the two tiger slot 220 may be disposed on two lateral ends of the core insert 200, and may be symmetrically disposed along the length direction of the core insert 200.

The insert-receiving cavity 210 may be cylindrical, open at the top, and defined by a cylindrical sidewall and a circular bottom wall. The overall dimensions of the insert-receiving cavity 210 may be pre-set according to the product profile.

The tiger notch 220 is simultaneously engaged with the tiger notch 330 of the cavity insert 300 and the positioning part 530 of the retraction slider 500. The size of the slot 220 may be preset according to the shape of the tiger's mouth 330 of the cavity insert 300 and the positioning part 530 of the retraction slider 500.

Fig. 5 is a bottom view of the cavity insert 300 of the injection mold 10 shown in fig. 1, illustrating a bottom structure of the cavity insert 300.

The cavity insert 300 has an insert receiving hole 310 located above the insert receiving cavity 210 and penetrating through the thickness direction of the cavity insert 300. The insert receiving hole 310 is for inserting the runner insert 400. The radius of the cross-section of the insert-receiving cavity 210 may be equal to or greater than the bore radius of the insert-receiving bore 310. For example, the radius of the cross section of the insert-receiving cavity 210 may be equal to the radius of the bore of the insert-receiving bore 310, and when the injection mold 10 is in the closed state, the bore wall of the insert-receiving bore 310 and the bore wall of the insert-receiving cavity 210 form a smooth curved surface.

The lower surface of the cavity insert 300 is further formed with a tiger's mouth 330 for being engaged with the tiger's mouth groove 220. The web 330 is arranged corresponding to the web slot 220, the thickness of the web 330 is the same as the depth of the web slot 220, and the web 330 is clamped into the web slot 220 when the injection mold 10 is in a mold closing state.

The runner insert 400 is inserted through the insert-receiving hole 310 from above the cavity insert 300 and into the insert-receiving cavity 210. That is, the runner insert 400 passes through the cavity insert 300 from top to bottom and enters the insert receiving cavity 210. The flow passage insert 400 may be cylindrical, and may have a central axis coaxial with the central axis of the insert-receiving cavity 210 and the central axis of the insert-receiving hole 310, and may extend in a vertical direction.

The radius of the cross section of the flow passage insert 400 located in the insert-receiving cavity 210 is smaller than the radius of the cross section of the insert-receiving cavity 210, and the radius of the cross section of the flow passage insert 400 located in the insert-receiving hole 310 is equal to the hole radius of the insert-receiving hole 310.

For example, the radius of the cross-section of the insert-receiving cavity 210 may be equal to the bore radius of the insert-receiving bore 310. The runner insert 400 located in the insert receiving hole 310 may be in interference fit with the insert receiving hole 310 to fix the runner insert 400, and prevent the runner insert 400 from shaking in a mold closing state. The product may include the undercut 103 and the body 102 (body barrel in addition to the undercut 103). The runner insert 400 located in the insert-receiving cavity 210 encloses a product body cavity with the sidewalls and bottom wall of the insert-receiving cavity 210, the product body cavity being used to mold the body portion 102 of the product. The undercut molding portion 520 and the sidewall of the insert receiving cavity 210 enclose a product undercut cavity for molding the undercut 103 of the product.

The runner insert 400 is provided with an injection runner 410 communicated with the product cavity 101 for circulating injection fluid. The injection molding runner 410 penetrates the runner insert 400 from top to bottom along the vertical direction, and is located in the middle of the runner insert 400.

The lower surface of the cavity insert 300 is also formed with a slide groove 320 leading to the insert receiving hole 310. The slide groove 320 may extend horizontally inward from an outer peripheral edge of the cavity 300 to the insert receiving hole 310, for example, may extend inward from a lateral end of the cavity to the insert receiving hole 310 in a length direction of the cavity. The number and relative positions of the chutes 320 can be correspondingly set according to the number and relative positions of the inversed buckles 103, and one chute 320 corresponds to one inversed buckle 103.

In this embodiment, the sliding groove 320 may be T-shaped, and has a first groove portion extending along the width direction of the cavity 300 and a second groove portion extending along the length direction of the cavity 300, wherein the length extending direction of the second groove portion is parallel to the length direction of the cavity 300, and the second groove portion leads to the insert receiving hole 310. The first slot portion and the second slot portion may each be a rectangular slot. The first groove portion is close to the edge of the cavity 300, and the first groove portion extends outward along the length direction of the cavity 300 and is communicated with the external spaces at the two lateral sides of the cavity 300.

In some alternative embodiments, the slide groove 320 may also be a straight rectangular groove extending horizontally inward from a lateral end of the cavity insert 300 directly to the insert receiving hole 310.

The embodiment is merely exemplified by the injection mold 10 suitable for a product having two symmetrically arranged undercuts 103, and a person skilled in the art would be fully capable of arranging for other products based on the understanding of the embodiment, and will not be shown one by one here.

In this embodiment, two sliding grooves 320 are respectively disposed at two sides of the insert receiving hole 310, for example, the two sliding grooves 320 may respectively extend from two lateral ends of the lower surface of the cavity 300 to the insert receiving hole 310 along the length direction of the cavity 300.

In this embodiment, there may be four tiger mouths 330, and every two tiger mouths 330 are disposed corresponding to one tiger mouth slot 220. The number of the retraction sliders 500 may be the same as the number of the slide grooves 320. The retraction slider 500 may be two, and each retraction slider 500 is reciprocally slidably disposed in one of the sliding grooves 320.

The injection mold 10 is described in detail below by taking the first web 330, the first web slot 220, the sliding groove 320 and the retraction slider 500 on one lateral side of the injection mold 10 as an example, and those skilled in the art will be fully capable of designing structures on the other lateral side of the injection mold 10 with an understanding of the following embodiments.

The web 330 may include a first web and a second web, and is symmetrically disposed on both sides of the sliding groove 320 with respect to a length extending direction of the sliding groove 320. The length extending direction of the sliding groove 320 is the length direction of the cavity 300, that is, the first web 330 and the second web 330 are arranged along the width direction of the cavity 300. The distance between the first web 330 and the second web 330 is smaller than the width of the runner 320.

Fig. 6 is a schematic view of the retraction slider 500 in the injection mold 10 shown in fig. 1, and fig. 7 is a schematic view of the cavity insert 300 and the retraction slider 500 in the injection mold 10 shown in fig. 1.

The retraction slider 500 is reciprocally slidably disposed in the sliding groove 320, and has a sliding portion 510, a positioning portion 530 and an inverted-buckle-shaped portion 520. The sliding portion 510 is embedded in the sliding groove 320 and slides along the sliding groove 320, the positioning portion 530 is used for being matched with the first web groove 220 to position the inverted portion 520, the inverted portion 520 is used for being inserted into the runner insert 400 and extending downward from the insert accommodating hole 310 into the insert accommodating cavity 210, so as to define the product cavity 101 together with the cavity wall of the insert accommodating cavity 210 and the runner insert 400.

Since the slide groove 320 communicates with the insert-receiving hole 310, the retraction slider 500 may slide in a direction toward the insert-receiving hole 310 or in a direction away from the insert-receiving hole 310.

For example, the positioning portion 530 may be snapped into the slot 220 in a clamped state of the injection mold 10 to cooperate with the slot 220 to position the undercut portion 520 such that the undercut portion 520 defines the product cavity 101 together with the core insert 200 and the runner insert 400. After injection molding, when the injection mold 10 is demolded, the positioning portion 530 may be disengaged from the first web groove 220, and the sliding portion 510 may slide along the sliding groove 320, so as to drive the inverted buckle forming portion 520 to move, so as to form a gap with the inverted buckle 103 of the product.

The sliding portion 510 may be embedded in the second groove portion and configured to slide reciprocally along the second groove portion. The profile of the sliding part 510 is adapted to the profile of the second groove part. For example, the sliding portion 510 may have a substantially rectangular parallelepiped shape. The slide 510 is configured to be inserted into the slide groove 320 from an end of the slide groove 320 communicating with the insert receiving hole 310, and to slide outward along the slide groove 320, so that the retracting slider 500 is integrally assembled to the cavity insert 300.

In the injection mold 10 of the present embodiment, the retraction slide 500 may be assembled to the sliding groove 320 of the cavity insert 300 through the sliding portion 510, and the position of the undercut portion 520 may be limited by the positioning portion 530, which is beneficial to simplifying the structure of the injection mold 10 and reducing the volume of the injection mold 10.

The depth of the sliding groove 320 is the same as the thickness of the sliding portion 510, that is, when the sliding portion 510 is inserted into the second groove portion, the lower surface of the sliding portion 510 and the lower surface of the cavity insert 300 may be in the same horizontal plane.

The undercut 520 is connected to the end of the slide 510 facing the runner insert 400. In this embodiment, the undercut portion 520 may be integrally formed with the sliding portion 510.

The runner insert 400 defines a sliding cavity 420 communicating with the sliding groove 320 and into which the inverted molding portion 520 extends. That is, the opening of the sliding chamber 420 faces the chute 320. The slide cavity 420 is in communication with the slide slot 320 and is located in the insert-receiving bore 310 and extends downwardly from within the insert-receiving bore 310 into the insert-receiving cavity 210 such that the undercut 520 may extend downwardly from within the insert-receiving bore 310 into the insert-receiving cavity 210. Since the second sliding groove 320 extends along the length direction of the cavity insert 300, the sliding direction of the sliding portion 510 is a horizontal direction, and the sliding portion 510 can drive the undercut molding portion 520 to move back and forth in the sliding cavity 420 along a horizontal inward direction or a horizontal outward direction when sliding along the sliding groove 320, so as to adjust the position of the undercut molding portion 520.

The slide cavity 420 extends horizontally inwards from the side wall of the runner insert 400, and when the positioning portion 530 is matched with the tiger slot 220, in the extending direction of the slide cavity 420, the distance between the inverted buckle forming portion 520 and the cavity wall of the slide cavity 420 is greater than a set threshold, so that when the positioning portion 530 is separated from the tiger slot 220, the inverted buckle forming portion 520 is driven by the slide portion 510 to move inwards along the slide cavity 420, so that the inverted buckle forming portion 520 is completely separated from the product inverted buckle 103 cavity.

Fig. 8 is a schematic view of a partial structure of the injection mold 10 shown in fig. 1 in an open state, in which the arrow direction shows the sliding direction of the retraction slider 500, and the dotted line shows a boundary line between the sliding portion 510 and the inverted portion 520 in the retraction slider 500. After injection molding, when the positioning portion 530 is separated from the slot 220, the sliding portion 510 slides inwards along the sliding slot 320 to drive the inverted molding portion 520 to move in the sliding cavity 420, so that the inverted molding portion 520 is separated from the product inverted cavity to realize inverted release. The set threshold may be set according to the lateral length of the undercut 103, and may be, for example, 1 to 2mm greater than the lateral length of the undercut 103.

The positioning portions 530 and the web 330 are simultaneously engaged with the web groove 220, that is, the positioning portions 530 and the web 330 can be simultaneously engaged in the web groove 220 to realize mold closing of the injection mold 10.

A gap is formed between the positioning part 530 and the undercut molding part 520. In this embodiment, the positioning portion 530 and the inverted-buckle-shaped portion 520 may be substantially distributed at two ends of the sliding portion 510. The positioning part 530 may be formed to protrude downward from a lower surface of the end section of the sliding part 510. Since the second groove portion extends along the length direction of the cavity insert 300, the sliding portion 510 has an end section close to the sliding chamber 420 and another end section far from the sliding chamber 420 with respect to the sliding chamber 420 in the extending direction of the second groove portion, and the positioning portion 530 may be formed to protrude downward from the lower surface of the end section far from the sliding chamber 420.

The thickness of the web 330 is the same as the thickness of the positioning parts 530, that is, the lower surface of the web 330 and the lower surface of the positioning parts 530 are in the same horizontal plane.

When the positioning portion 530 is engaged with the first web slot 220, the positioning portion 530 is located between the first web 330 and the second web 330, and the surface of the positioning portion 530 facing the runner insert 400 is an inclined surface 531, which is coplanar with the surfaces of the first web 330 and the second web 330 facing the runner insert 400. The tiger mouth groove 220 is correspondingly provided with a tiger mouth inclined surface 221 which is matched with the inclined surface 531, so that the demolding quality is improved.

The fixing block 600 is fixedly disposed on the cavity insert 300 and located on a side of the retracted slide block 500 opposite to the runner insert 400. The fixing block 600 may be fixed to the cavity 300 by screws. The fixing block 600 has a first fixing portion fitted to the sliding groove 320, and a second fixing portion downwardly protruding from a lower surface of the first fixing portion. The first fixing portion and the second fixing portion may be a single piece. The thickness of the first fixing portion may be the same as the depth of the sliding groove 320. The first fixing portion may be inserted into the sliding groove 320 from one lateral side of the cavity, for example, may be inserted into the first groove portion. The shape of the first fixing part can be matched with that of the first groove part. The second fixing portion is located between the first web 330 and the second web 330, and the lower surface of the second fixing portion and the lower surface of the positioning portion 530 are located in the same horizontal plane.

In the embodiment, the tiger's mouth 330 of the cavity insert 300 and the tiger's mouth groove 220 of the core insert 200 are improved, and the tiger's mouth 330 and the tiger's mouth groove 220 are matched with the inward-shrinkage sliding block 500 and the fixing block, so that the demolding of a small cylindrical product is met, the structure of the injection mold 10 is simplified, and multiple purposes are achieved.

One end of the spring 700 is connected to the fixed block 600, and the other end is connected to the retractable slider 500, in this embodiment, the spring 700 is embedded in the fixed block 600 and the retractable slider 500 and extends and retracts in the horizontal direction. And when the positioning portion 530 is engaged with the tiger notch 220, the spring 700 is in a compressed state. The surface of the retracting slider 500 facing away from the runner insert 400 is attached to the fixing block 600. The surface of the fixing block 600, which is attached to the retracting slider 500, is a vertical plane. That is, the surface of the retracting slider 500 facing away from the runner insert 400 forms a vertical surface that is attached to the fixing block 600. After the injection molding is completed, the core insert moves downward, and when the positioning portion 530 is separated from the slot 220, the retractable slider 500 moves inward along the sliding groove 320 under the driving of the elastic force of the spring 700, thereby being away from the fixing block 600.

The injection mold 10 of the present embodiment includes a core insert 200, a cavity insert 300, a runner insert 400 and a retraction slider 500, wherein the core insert 200 has an insert receiving cavity 210 and a tiger's mouth groove 220, the cavity insert 300 is disposed above the core insert 200, and has an insert receiving hole 310 penetrating through the thickness direction and a sliding groove 320 formed on the lower surface and leading to the insert receiving hole 310. The runner insert 400 is inserted into the insert receiving cavity 210 of the core insert 200 after passing through the insert receiving hole 310 of the cavity insert 300, the retraction slide 500 is reciprocally slidably disposed in the slide groove 320, and has a positioning portion 530 and a undercut portion 520, the undercut portion 520 can be positioned by the positioning portion 530, and the undercut portion 520 is inserted into the runner insert 400 to define the product cavity 101 with the cavity wall of the insert receiving cavity 210 and the runner insert 400. This embodiment is through carrying out the institutional advancement to injection mold 10, improved injection mold 10's the mode of taking off the back-off, the slider 500 that contracts in will have back-off shaping portion 520 sets up in the spout 320 of cavity core 300, because the slider 500 that contracts in can follow spout 320 reciprocating sliding, when positioning portion 530 breaks away from slot 220, the slider 500 that contracts in can follow spout 320 and slide so that back-off shaping portion 520 breaks away from product back-off 103 die cavity, thereby realize taking off back-off 103, whole process is very simple.

Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been shown and described in detail herein, many other variations and modifications can be made, consistent with the principles of the invention, which are directly determined or derived from the disclosure herein, without departing from the spirit and scope of the invention. Accordingly, the scope of the present invention should be understood and interpreted to cover all such other variations or modifications.

Claims (10)

1. An injection mold, comprising:

the male die core is provided with a downwards-sunken insert accommodating cavity and a first web groove;

the cavity insert is arranged above the core insert and is provided with an insert accommodating hole which is positioned above the insert accommodating cavity and penetrates through the thickness direction of the cavity insert; the lower surface of the female die core is also provided with a sliding chute leading to the insert accommodating hole;

the runner insert penetrates through the insert accommodating hole from the upper part of the female die core and is inserted into the insert accommodating cavity;

the retractable sliding block is arranged in the sliding groove in a reciprocating sliding mode, and is provided with a positioning portion and a back-off forming portion, the positioning portion is used for being matched with the tiger's mouth groove to position the back-off forming portion, the back-off forming portion is used for being inserted into the runner insert and extending downwards in the insert accommodating hole to the insert accommodating cavity, so that the runner insert and the cavity wall of the insert accommodating cavity define a product cavity together.

2. An injection mold according to claim 1,

the insert accommodating cavity is cylindrical; the radius of the cross section of the insert receiving cavity is equal to or greater than the bore radius of the insert receiving bore;

the runner insert is cylindrical, the central axis of the runner insert is coaxial with the central axis of the insert accommodating cavity and the central axis of the insert accommodating hole, the radius of the cross section of the runner insert in the insert accommodating cavity is smaller than that of the cross section of the insert accommodating cavity, and the radius of the cross section of the runner insert in the insert accommodating hole is equal to the hole radius of the insert accommodating hole.

3. An injection mold according to claim 1,

the sliding groove extends inwards from the outer periphery of the female die core to the insert accommodating hole along the horizontal direction; the inward-retracting sliding block is provided with a sliding part which is embedded into the sliding groove and slides along the sliding groove, and the inverted buckle forming part is connected to one end, facing the runner insert, of the sliding part;

the runner insert is provided with a sliding cavity communicated with the sliding groove and used for the inverted buckle forming part to stretch into, and an injection molding runner communicated with the product cavity.

4. An injection mold according to claim 3,

the slide cavity extends inwards from the side wall of the runner insert along the horizontal direction, and when the positioning portion is matched with the tiger mouth groove, the distance between the inverted buckle forming portion and the cavity wall of the slide cavity is larger than a set threshold value in the extending direction of the slide cavity, so that when the positioning portion is separated from the tiger mouth groove, the inverted buckle forming portion moves inwards along the slide cavity under the driving of the slide portion, and the inverted buckle forming portion is completely separated from the product inverted buckle cavity.

5. An injection mold according to claim 3,

the depth of the sliding groove is the same as the thickness of the sliding part; a gap is reserved between the positioning part and the inverted buckle forming part, and the positioning part is formed by downwards protruding from the lower surface of the end section of the sliding part;

the lower surface of the cavity insert is also provided with a tiger's mouth matched with the tiger's mouth groove, and the thickness of the tiger's mouth is the same as that of the positioning part.

6. An injection mold according to claim 5,

the first web jaw and the second web jaw are symmetrically arranged on two sides of the sliding groove relative to the length extension direction of the sliding groove, and the distance between the first web jaw and the second web jaw is smaller than the width of the sliding groove;

when the positioning part is matched with the first web groove, the positioning part is positioned between the first web and the second web, the surface of the positioning part facing the runner insert is an inclined surface, and the inclined surface is coplanar with the surfaces of the first web and the second web facing the runner insert.

7. An injection mold according to claim 6, further comprising:

the fixed block is fixedly arranged on the cavity insert and is positioned on one side of the inward-shrinkage sliding block back to the runner insert; the fixed block is provided with a first fixed part assembled on the sliding groove and a second fixed part protruding downwards from the lower surface of the first fixed part;

and one end of the spring is connected with the fixed block, the other end of the spring is connected with the inward-contracting sliding block, and when the positioning part is matched with the tiger's mouth groove, the spring is in a compressed state.

8. An injection mold according to claim 7,

and a vertical surface which is attached to the fixed block is formed on the surface of the inward-retracting sliding block, which faces back to the runner insert.

9. An injection mold according to claim 7,

the spring stretches out and draws back along the horizontal direction, and inlays and locates the fixed block with in the slider that contracts.

10. An injection mold according to claim 5,

the two sliding grooves are respectively arranged on two sides of the insert accommodating hole;

the number of the inward-retracting sliding blocks is two, and each inward-retracting sliding block can be arranged in one sliding chute in a reciprocating sliding manner; and is

The first web is provided with a first web slot, and the first web slot is provided with a first web slot.

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