CN117325397A - Injection mold with slide block hidden in slide runner and molding method - Google Patents

Abstract

The application provides an injection mold with a slide block hidden in a runner and a molding method, which are applied to the technical field of injection molds, wherein the injection mold comprises a front mold and a rear mold; the front mold core of the front mold is provided with a pouring channel in a penetrating way; a slide block is slidably arranged on the rear mold, a lateral hiding gate communicated with the pouring gate and in a necking shape is arranged on one side of the upper end face of the insert on the slide block, and a melt at the pouring gate is guided to enter the product cavity laterally during mold closing of the lateral hiding gate, wherein the height of the lateral hiding gate in the mold opening and closing direction is lower than the parting surface height of the product cavity; and a residual material ejector pin of a residual material ejection mechanism is arranged on the rear die. The lateral submerged gate is arranged on the slide block, the lateral submerged gate guides the melt to laterally enter the product cavity, water gap marks cannot be exposed on the visible surface of the product, and the attractiveness of the product is not affected.

Description

Injection mold with slide block hidden in slide runner and molding method

Technical Field

The application relates to the technical field of injection molds, in particular to an injection mold with a slide block hidden in a slide runner and a molding method.

Background

An injection mold is a tool for producing plastic products and generally consists of a front mold (also called a movable mold) and a rear mold (also called a fixed mold); the pouring channel of the mold refers to the channel through which the plastic melt flows in the mold after exiting the nozzle of the injection molding machine before reaching the mold cavity, and is typically injected into the mold cavity via the front mold. The product cooling shaping back can form the mouth of a river structure, and traditional mouth of a river structure mostly sets up on plastic products's upper surface, and this surface is the surface that can be observed daily again, consequently can influence aesthetic property, has increased the process time on the one hand through modes such as polishing in the follow-up, and the surface after polishing still has the unevenness phenomenon on the other hand.

The utility model patent of China with the application number of CN201520834338.7 discloses a transparent dust cup mold, which comprises a movable mold base plate, a fixed mold base plate, a movable mold base plate and a fixed mold plate, wherein a mold core is arranged on the movable mold plate, an injection molding mold cavity is formed between the mold core and a mold cavity, a material pushing plate is arranged between the movable mold plate and the movable mold base plate, at least one material pushing rod is arranged on the material pushing plate, a plurality of sliding blocks are arranged on the movable mold plate, a reinforcing rib thinning core is arranged on the sliding blocks, an inclined guide pillar is arranged on the fixed mold plate, the sliding blocks are in sliding fit with the inclined guide pillar, a plurality of core pulling cylinders are arranged on the movable mold base plate, a local thin pressing core is arranged on a piston rod of each core pulling cylinder, and a reset rod is arranged on the movable mold base plate. The plastic melt directly enters the cavity through the injection molding opening, so that a water gap is formed on the upper surface of the dust cup, and the appearance is affected.

Referring specifically to fig. 1, taking a plastic dust cup of a conventional mite-removing instrument as an example, a water gap trace X is left on the upper surface of the dust cup after the dust cup is molded, so that the aesthetic property is affected.

Disclosure of Invention

First, the technical problem to be solved

In view of this, the application provides an injection mold and a molding method that slider is hidden at a slide gate, sets up the side direction and is hidden the gate port and guide plastics fuse-element side direction to get into the die cavity, opens through slide slider removal and realizes the stretch-breaking separation of mouth of a river clout and product, and the pouring point is on the side terminal surface of product, does not influence pleasing to the eye, can solve the defect that exists among the prior art.

(II) technical scheme

The embodiment of the specification provides the following technical scheme:

the embodiment of the specification provides an injection mold with a slide block hidden in a runner, which comprises:

the front die is provided with a front die core, and the front die core is provided with a pouring channel in a penetrating way;

the rear die is provided with a rear die core, a slide block perpendicular to the die opening direction is slidably arranged on the rear die, an insert corresponding to the rear die core is arranged on the slide block, and the front die core, the rear die core and the insert form a product cavity for forming a product workpiece;

a lateral hiding gate communicated with the pouring gate and in a necking shape is arranged on one side of the upper end surface of the insert, the lateral hiding gate is configured to guide a melt at the pouring gate to laterally enter the product cavity when the die is closed, and the height of the lateral hiding gate in the die opening and closing direction is lower than the parting surface height of the product cavity;

when the mold is opened, the front mold drives the slide block to move outwards to open, so that the gate excess material formed at the lateral submerged gate is broken and separated from the lateral end face of the molded product workpiece, and the lateral face of the molded product workpiece is a face which is not concerned by consumers when in use, thereby omitting the working procedures of polishing gates and the like and not affecting the overall aesthetic property; the upper end face of the insert is provided with a lower material returning cavity communicated with the pouring gate and the lateral submerged pouring gate, the rear die is provided with a residual material ejection mechanism, the residual material ejection mechanism comprises a residual material thimble movably arranged on the rear die, and the residual material thimble is configured to eject residual material at the lower material returning cavity along the die opening direction when the die is opened, so that the water gap residual material is completely separated from the insert upwards.

In some embodiments, the remainder ejection mechanism further comprises a floating ejector rod installed in the insert, the floating ejector rod is arranged right below the lower material returning cavity, and the slide block drives the floating ejector rod to be arranged right above the remainder ejector pin in a sliding manner during die opening.

In some embodiments, a mounting cavity for mounting a floating ejector rod is arranged in the insert, and the floating ejector rod is sleeved with a return spring.

In some embodiments, the front mold is provided with an inclined guide post, and the slide block is provided with a matching groove matched with the inclined guide post.

In some embodiments, the lateral submerged gate is disposed obliquely downward, and a side of the lower return cavity remote from the lateral submerged gate is provided with a balancing gate cavity.

In some embodiments, the lower material returning cavity is semi-cylindrical, the front mold core is correspondingly provided with a semi-cylindrical upper material returning cavity, and the lower material returning cavity and the upper material returning cavity are spliced to form a cylindrical material returning cavity.

In some embodiments, a pull break point is formed on a side end face of the product workpiece; and a product ejector pin for ejecting the product workpiece is arranged on the rear die core.

The embodiment of the specification also provides a molding method of the injection mold with the slide block hidden in the slide gate, which is realized based on the injection mold with the slide block hidden in the slide gate according to any embodiment of the specification, and when the injection mold is closed, melt to be molded sequentially passes through the gate on the front mold, the blanking cavity on the slide block and the lateral hidden gate, and laterally and obliquely enters into a product cavity of the injection mold; when the injection mold is opened, the slide block moves outwards to open, so that the gate excess material at the lateral submerged gate is broken and separated from the lateral end face of the molded product workpiece; and the excess material ejector pin of the excess material ejector mechanism ejects the excess material and the gate excess material in the lower material returning cavity of the insert upwards.

In some embodiments, the injection mold specifically includes the following steps when opening: step S01, after the injection mold is clamped and cooled, the front mold moves upwards relative to the rear mold, and the slide block is driven to move outwards synchronously by the inclined guide pillar of the front mold to open, so that the gate excess material at the lateral submerged gate is broken and separated from the lateral end face of the molded product workpiece; step S02, after the front die is opened, enabling a floating ejector rod in the slide block to be positioned right above a residual ejector pin; and S03, a floating ejector rod in the upper ejection insert of the residual material ejector pin ejects the residual material at the lower material returning cavity upwards, so that the gate residual material at the lateral submerged gate is completely separated from the insert of the slide block.

In some embodiments, in the step S03, the product workpiece is synchronously ejected out of the rear mold core through the product ejector pin in the rear mold, so as to complete demolding of the product workpiece; the height of the lateral submerged gate opening in the vertical direction is lower than the parting surface height of the product cavity.

(III) beneficial effects

Compared with the prior art, the beneficial effects that above-mentioned at least one technical scheme that this description embodiment adopted can reach include at least:

the lateral submerged gate is arranged on the slide block, so that the lateral submerged gate guides the melt to enter the product cavity laterally, gate marks are not exposed on the visible surface of the product, the aesthetic property of the product is not affected, polishing treatment on the gate marks is not needed, and the operation procedure is saved; the lateral submerged gate is in a necking shape, so that the connection between the gate remainder and a product workpiece can be directly broken when the slide block slides and opens, and the separation mode is simple; through setting up clout thimble and the floating ejector pin of clout ejection mechanism for ejecting the clout of runner department of hiding when the drawing of patterns, the floating ejector pin is installed on the mold insert of slide slider, and its ejecting position realizes accurate positioning through the oblique guide pillar of front mould, and the floating ejector pin of messenger's drawing of patterns is placed directly over the clout thimble in the slip, and the rethread thimble bottom plate drives the ejection of the drawing of patterns that the clout thimble was realized to the top, and simple structure is stable and reliable.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a perspective view of a prior art plastic dirt cup embodying a water gap trace;

FIG. 2 is an exploded view of the front and rear molds of the injection mold of the present application;

FIG. 3 is a perspective view of a product workpiece of the present application;

FIG. 4 is a perspective view of a front mold of the present application;

FIG. 5 is an enlarged view of I of FIG. 4 in the present application;

FIG. 6 is a perspective view of the remainder of the present application;

FIG. 7 is a perspective view of a rear mold of the present application;

FIG. 8 is a cross-sectional view of a rear mold of the present application;

FIG. 9 is an enlarged view of II of FIG. 8 in the present application;

FIG. 10 is a perspective view of a row slider of the present application;

FIG. 11 is a perspective view of the remainder ejector pin in the present application with the floating ejector pin being ejected;

FIG. 12 is a perspective view of a front mold insert of the present application;

FIG. 13 is a perspective view of an insert of the present application;

FIG. 14 is a cross-sectional view of an insert of the present application;

FIG. 15 is a perspective view of a floating ram and return spring of the present application;

in the figure: 1 is a front mould; 2 is a rear mould; 3 is a front mold core; 4 is a pouring channel; 5 is a rear mold core; 6 is a row position slide block; 7 is an insert; 8 is a product workpiece; 9 is a lateral hidden gate; 10 is the gate excess material; 11 is a lower material returning cavity; 12 is a residue thimble; 13 is the remainder; 14 is a floating ejector rod; 15 is a mounting cavity; 16 is a return spring; 17 is an oblique guide post; 18 is a mating groove; 19 is a balanced runner cavity; 20 is an upper material returning cavity; 21 is the product thimble.

Detailed Description

Embodiments of the present application are described in detail below with reference to the accompanying drawings.

Other advantages and effects of the present application will become apparent to those skilled in the art from the present disclosure, when the following description of the embodiments is taken in conjunction with the accompanying drawings. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. The present application may be embodied or carried out in other specific embodiments, and the details of the present application may be modified or changed from various points of view and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

It is noted that various aspects of the embodiments are described below within the scope of the following claims. It should be apparent that the aspects described herein may be embodied in a wide variety of forms and that any specific structure and/or function described herein is merely illustrative. Based on the present application, one skilled in the art will appreciate that one aspect described herein may be implemented independently of any other aspect, and that two or more of these aspects may be combined in various ways. For example, apparatus may be implemented and/or methods practiced using any number and aspects set forth herein. In addition, such apparatus may be implemented and/or such methods practiced using other structure and/or functionality in addition to one or more of the aspects set forth herein.

It should also be noted that the illustrations provided in the following embodiments merely illustrate the basic concepts of the application by way of illustration, and only the components related to the application are shown in the drawings and are not drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of the components in actual implementation may be arbitrarily changed, and the layout of the components may be more complicated.

In addition, in the following description, specific details are provided in order to provide a thorough understanding of the examples. However, it will be understood by those skilled in the art that the present utility model may be practiced without these specific details.

Referring to fig. 2, fig. 4 and fig. 7, the application provides an injection mold with a slide block hidden in a runner, which specifically comprises a front mold 1 and a rear mold 2; the front die 1 is provided with a front die core 3, and the front die core 3 is provided with a pouring channel 4 in a penetrating way; the rear die 2 is provided with a rear die core 5, a slide block 6 perpendicular to the die opening direction is slidably arranged on the rear die 2, an insert 7 corresponding to the rear die core 5 is arranged on the slide block 6, and a product cavity for molding a product workpiece 8 is formed by the front die core 3, the rear die core 5 and the insert 7; the upper end face side of the insert 7 is provided with a lateral hiding gate 9 which is communicated with the runner 4 and is in a necking shape (so that when the slide block 6 slides outwards and is opened, the excessive residual materials cooled at the lateral hiding gate 9 can be broken off), the lateral hiding gate 9 is configured to guide a melt at the runner 4 to laterally enter a product cavity when the mold is closed, and the height of the lateral hiding gate 9 in the mold opening and closing direction is lower than the parting surface height of the product cavity.

When the mold is opened, the front mold 1 drives the slide block 6 to move outwards to be opened, so that the gate excess material 10 formed at the lateral submerged gate 9 is broken and separated from the lateral end face of the molded product workpiece 8; the upper end face of the insert 7 is provided with a lower material returning cavity 11 which is communicated with the pouring gate 4 and the lateral hiding gate opening 9, the rear die 2 is provided with a residual material ejection mechanism, the residual material ejection mechanism comprises a residual material ejector pin 12 movably arranged on the rear die 2, and the residual material ejector pin 12 is configured to eject residual materials 13 at the lower material returning cavity 11 along the die opening direction when the die is opened, so that the gate residual materials 10 are completely separated from the insert 7 upwards. According to the method, the melt is guided to laterally enter the product cavity through the lateral submerged gate, the gate trace cannot be exposed on the visible surface of the product, the attractiveness of the product is not affected, and polishing treatment on the gate trace is not needed.

As shown in fig. 14, the right side end (discharge port) of the lateral submerged runner 9 is inclined downward into the product cavity, and the left side end (feed port) is connected with the lower return cavity 11 and the runner 4, and the whole is in a necking shape with one large end and one small end.

It should be noted that the shape of the lateral submerged gate orifice 9 is not limited in this application, and may be a conical necking structure, an oblate conical necking structure, a conical necking structure with a waist-shaped cross section, or the like.

In some preferred embodiments, as shown in fig. 9 and 15, the remainder ejection mechanism further includes a floating ejector rod 14 installed in the insert 7, the floating ejector rod 14 is disposed directly below the lower stripper cavity 11 (may be used as a part of the latent runner), and the slide block 6 drives the floating ejector rod 14 to slide and place in a position directly above the remainder ejector rod 12 during mold opening.

The hidden runner of the injection mold mainly comprises a lower material returning cavity 11 and a lateral hidden runner port 9, after the product is cooled and molded, the redundant residual material 13 in the hidden runner is ejected out through a residual material ejector pin 12 and a floating ejector pin 14, the residual material 13 formed after the hidden runner is cooled is shown in fig. 6, and a dotted line area in the drawing is an ejection contact area of the floating ejector pin 14.

In some embodiments, a mounting cavity 15 for mounting a floating ejector rod 14 is arranged in the insert 7, the mounting cavity 15 is communicated with the lower material returning cavity 11, and the floating ejector rod 14 is sleeved with a return spring 16.

The return spring 16 always provides a downward thrust for the floating ejector rod 14, and is used for automatic return of the floating ejector rod 14, so that the influence on the latency pouring channel is avoided.

In one example, as shown in fig. 4 and 7, an oblique guide post 17 is mounted on the front mold 1, a matching groove 18 matched with the oblique guide post 17 is provided on the slide block 6, and the sliding opening amount of the slide block 6 is controlled by the oblique guide post 17, so that the vertical direction of mold opening is switched to the transverse direction of slide opening.

In some embodiments, referring to fig. 14, the lateral submerged gate 9 is arranged obliquely downwards, and a balancing gate cavity 19 is arranged at one side of the lower material returning cavity 11 away from the lateral submerged gate 9 for balancing stress; as shown in fig. 6, the balance slug 22 is formed on the side of the slug 13 formed in the mold away from the nozzle slug 10 after cooling the product.

In some embodiments, the lower material-returning cavity 11 is semi-cylindrical, the front mold core 3 is correspondingly provided with a semi-cylindrical upper material-returning cavity 20, and the lower material-returning cavity 11 and the upper material-returning cavity are spliced to form a cylindrical material-returning cavity (the floating ejector rod 14 cooperates with the material-returning cavity to form a complete latency runner, and the latency runner is formed by the floating ejector rod 14 during mold opening).

In some embodiments, a pull-off point Y (the water gap trace described in the background art) is formed on the side end surface of the product workpiece 8, and the pull-off point Y is arranged on the side end surface, and after the product workpiece 8 is mounted on the mite removal body, the side end surface is in contact connection with the mite removal body, that is, the pull-off point Y is an unobservable part after assembly, so that the pull-off point Y does not need to be subjected to a polishing correction procedure; the rear die core 5 is provided with a product thimble 21 for ejecting the product workpiece 8, and the product thimble 21 is used for ejecting the product workpiece 8 to the rear die core 5.

Based on the same inventive concept, the embodiment of the present disclosure further provides a molding method of an injection mold with a slide block hidden in a runner, which is implemented based on the injection mold with a slide block hidden in a runner according to any one of the foregoing embodiments of the present disclosure, and when the injection mold is closed, a melt to be molded sequentially passes through a runner 4 on a front mold 1, a material returning cavity 11 on a runner slide block 6, and a lateral hidden runner port 9, and obliquely enters into a product cavity of the injection mold in a lateral direction; the lateral hidden gate 9 is in a necking shape, so that when the injection mold is opened, the slide block 6 moves outwards to be opened (the slide block 6 is driven to be opened by the inclined guide pillar 17 on the front mold 1), so that the gate excess material 10 at the lateral hidden gate 9 is broken and separated from the lateral end face of the molded product workpiece 8; the excess material ejector pins 12 of the excess material ejector mechanism are used for ejecting the excess material and the water gap excess material in the lower material returning cavity 11 of the insert 7 upwards.

The gate slide block 6 is moved outwards to be opened, so that the gate excess material at the gate 9 can be separated from the side end face of the formed product workpiece 8 by breaking.

In some embodiments, when the injection mold is opened, the method specifically comprises the following steps: step S01, after the injection mold is clamped and cooled, the front mold 1 moves upwards relative to the rear mold 2, and the slide block 6 is driven to synchronously move outwards to be opened by the inclined guide pillar of the front mold 1, so that the gate excess material at the side submerged gate 9 is broken and separated from the side end face of the molded product workpiece 8; step S02, after the front die 1 is opened, a floating ejector rod 14 in a slide block 6 is positioned right above a residual ejector pin 12 (the slide block 6 is driven by an inclined guide post 17 on the front die 1 to realize accurate control of the position); and S03, a floating ejector rod 14 in the insert 7 is ejected by the excess material ejector pin 12, and excess material at the lower material returning cavity 11 is ejected upwards, so that the gate excess material at the lateral submerged gate 9 is completely separated from the insert 7 of the slide block 6.

In some embodiments, in step S03, the product workpiece 8 is synchronously ejected out of the rear mold core 5 through the product ejector pins 21 in the rear mold 2, so as to complete demolding of the product workpiece 8; the height of the lateral hidden gate 9 in the vertical direction is lower than the parting plane height of the product cavity.

In this specification, identical and similar parts of the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, the description is relatively simple for the embodiments described later, and reference is made to the description of the foregoing embodiments for relevant points.

The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions easily conceivable by those skilled in the art within the technical scope of the present application should be covered in the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (10)

1. An injection mold with a slider submerged in a runner, comprising:

a front mold (1) provided with a front mold core (3), wherein the front mold core (3) is provided with a pouring channel (4) in a penetrating way;

a rear die (2) provided with a rear die core (5), wherein a slide block (6) perpendicular to the die opening direction is slidably arranged on the rear die (2), an insert (7) corresponding to the rear die core (5) is arranged on the slide block (6), and the front die core (3), the rear die core (5) and the insert (7) form a product cavity for forming a product workpiece (8); it is characterized in that the method comprises the steps of,

a lateral hiding gate (9) which is communicated with the pouring gate (4) and is in a necking shape is arranged on one side of the upper end surface of the insert (7), the lateral hiding gate (9) is configured to guide a melt at the pouring gate (4) to laterally enter the product cavity when the mold is closed, and the height of the lateral hiding gate (9) in the mold opening and closing direction is lower than the parting surface height of the product cavity;

when the mold is opened, the front mold (1) drives the slide block (6) to move outwards to be opened, so that the gate excess material (10) formed at the lateral submerged gate (9) is broken and separated from the side end surface of the molded product workpiece (8); insert (7) up end is formed with intercommunication runner (4) with lower material return chamber (11) of pouring gate (9) of hiding in the side direction, install clout ejection mechanism on rear mould (2), clout ejection mechanism is including movable mounting clout thimble (12) on rear mould (2), clout thimble (12) are configured to follow during the die sinking ejecting clout (13) of unloading chamber (11) department in the die sinking direction, make mouth of a river clout (10) upwards breaks away from completely insert (7).

2. The injection mold with the slide block hidden in the row position runner according to claim 1, wherein the remainder ejection mechanism further comprises a floating ejector rod (14) installed in the insert (7), the floating ejector rod (14) is arranged under the lower material returning cavity (11), and the row position slide block (6) drives the floating ejector rod (14) to be slidingly arranged at a position right above the remainder ejector pin (12) during mold opening.

3. The injection mold with the slide block hidden in the runner according to claim 2, characterized in that a mounting cavity (15) for mounting a floating ejector rod (14) is arranged in the insert (7), and the floating ejector rod (14) is sleeved with a return spring (16).

4. Injection mold with a slide block hidden in a runner according to claim 1, characterized in that an oblique guide post (17) is installed on the front mold (1), and a matching groove (18) matched with the oblique guide post (17) is arranged on the runner slide block (6).

5. The injection mold with the slide block hidden in the runner according to claim 1, wherein the lateral hidden runner port (9) is arranged obliquely downwards, and a balance runner cavity (19) is arranged at one side of the lower material returning cavity (11) away from the lateral hidden runner port (9).

6. The injection mold with the slide block hidden in the runner according to claim 5, wherein the lower material returning cavity (11) is semi-cylindrical, the front mold core (3) is correspondingly provided with a semi-cylindrical upper material returning cavity (20), and the lower material returning cavity (11) and the upper material returning cavity (20) are spliced to form a cylindrical material returning cavity.

7. Injection mold with a slide latent in a runner according to claim 1, characterized in that the side end faces of the product pieces (8) are formed with pull-off points; and a product thimble for ejecting the product workpiece (8) is arranged on the rear die core (5).

8. A method for forming an injection mold with a slide block hidden in a runner, which is realized based on the injection mold with the slide block hidden in the runner according to any one of claims 1 to 7, and is characterized in that when the injection mold is closed, a melt to be formed sequentially passes through a runner (4) on a front mold (1), a material returning cavity (11) on a runner slide block (6) and a lateral hidden runner port (9) and obliquely enters into a product cavity of the injection mold in a lateral direction; when the injection mold is opened, the slide block (6) moves outwards to open, so that the gate excess material (10) at the lateral submerged gate (9) and the side end face of the molded product workpiece (8) are broken and separated; and the excess material ejector pins (12) of the excess material ejector mechanism are used for ejecting the excess material (13) and the nozzle excess material (10) in the lower material returning cavity (11) of the insert (7) upwards.

9. The method for casting an injection mold with a runner with a slider hidden in a row according to claim 8, wherein the method comprises the following steps when the injection mold is opened: step S01, after the injection mold is clamped and cooled, the front mold (1) moves upwards relative to the rear mold (2), and the slide block (6) is driven to move outwards synchronously by the inclined guide pillar (17) of the front mold (1) to be opened, so that the gate excess material (10) at the lateral hidden gate (9) is broken away from the side end face of the formed product workpiece (8); s02, after the front die (1) is opened, enabling a floating ejector rod (14) in the slide block (6) to be positioned right above the excess material ejector rod (12); and S03, a floating ejector rod (14) in the upper ejection insert (7) of the excess material ejector pin (12) ejects the excess material (13) at the lower material returning cavity (11) upwards, so that the gate excess material (10) at the lateral submerged gate opening (9) is completely separated from the insert (7) of the slide block (6).

10. The method for casting an injection mold with a slide-block hidden in a runner according to claim 8, wherein in the step S03, the product workpiece (8) is synchronously ejected out of the rear mold core (5) through the product ejector pin in the rear mold (2), so as to finish the demolding of the product workpiece (8); the height of the lateral hidden gate (9) in the vertical direction is lower than the parting plane height of the product cavity.