CN112277265B - Injection mold and injection molding method - Google Patents

Abstract

The invention provides an injection mold and an injection method. The injection mold comprises a front mold assembly and a rear mold assembly, wherein the front mold assembly comprises a first front template and a first magnetic locking mold part arranged on the first front template; the rear die assembly comprises a rear die plate group, a second magnetic locking die piece arranged on the rear die plate group, an ejection mechanism arranged in the rear die plate group, a first spacing adjusting piece connected to the rear die plate group, a rear die seat plate arranged on the side, away from the front die assembly, of the rear die plate group and connected to the first spacing adjusting piece in a sliding mode, and a first elastic piece connected between the rear die seat plate and the rear die plate group, a second cavity is formed in the side, close to the front die assembly, of the rear die plate group, a sliding block structure is arranged on the side, close to the front die assembly, of the rear die plate group, and a rear die insert pin is fixed on the side, close to the rear die plate group; when the front die assembly and the rear die assembly are assembled, the end part of the rear die insert pin is abutted against the side of the sliding block structure, which is deviated from the front die assembly. The injection mold of the scheme has the advantages of simple structure, small occupied space, high reliability, high molding quality and low cost.

Description

Injection mold and injection molding method

Technical Field

The invention belongs to the technical field of injection molds, and particularly relates to an injection mold and an injection molding method.

Background

Many products in the related art are produced by an injection molding process, an injection mold is needed when injection molding is performed, the injection mold generally comprises an upper template and a lower template opposite to the upper template, the upper template and the lower template are matched to form a cavity matched with the products, then molten plastic materials are injected into the cavity, and the upper template and the lower template are separated after cooling and then ejected and demolded to obtain the products.

Some types of products need to form corresponding concave or hole-shaped side features on the side surface, and need to form hole-shaped features communicated with the side features at the positions close to the edges of the front surface or the back surface, in the related art, the side features are usually formed by adopting a slide block structure, the hole-shaped features communicated with the side features and positioned on the front surface or the back surface need to be formed in a mode that the ends of insert pins are abutted against the slide block structure, in the demolding process, the insert pins need to be drawn out firstly, then the slide block structure is drawn out, and finally the product is ejected out.

Disclosure of Invention

The invention aims to provide an injection mold and an injection method, which can realize the actions of firstly drawing out a die-following insert pin, then drawing out a slide block structure and finally ejecting a product in the demolding process, and realize the actions of firstly resetting the slide block structure and then resetting the die-following insert pin in the mold closing process.

The technical scheme of the invention is as follows: the injection mold comprises a front mold assembly and a rear mold assembly correspondingly matched with the front mold assembly, the front mold assembly and the rear mold assembly are matched to form a mold cavity when the front mold assembly and the rear mold assembly are closed, the front mold assembly comprises a first front template close to the rear mold assembly and a first magnetic locking module arranged on the peripheral side of the first front template, and the side of the first front template close to the rear mold assembly is provided with the first cavity;

the back die assembly includes being close to the back die plate group of front die assembly, set up in week side of back die plate group and with second magnetism locking module that first magnetism locking module position corresponds, set up in ejection mechanism in the back die plate group, connect in deviating from of back die plate group the first interval regulating part of front die assembly side, set up in deviating from of back die plate group the back die plate board of front die assembly side, and connect in back die plate with first elastic component between the back die plate group, back die plate along die sinking direction sliding connection in first interval regulating part, being close to of back die plate group second die cavity is seted up to front die assembly side, being close to of back die plate group front die assembly side sets up can stretch into the slider structure in the second die cavity, being close to of back die plate group side fixedly connected with along the die sinking direction wear to locate back die plate group and can slide and stretch into the back die plate group in the second die cavity Inserting a needle;

when the front die assembly and the rear die assembly are assembled, one ends of the sliding block structures and the rear die insert pins extend into the die cavity, and the end parts of the rear die insert pins abut against the side, deviating from the front die assembly, of the sliding block structures.

Furthermore, the rear template group comprises a first rear template close to the front template assembly and a second rear template arranged on the first rear template and far away from the front template assembly, the rear template base plate is arranged on the second rear template and far away from the first rear template side, a first caulking groove is formed on the second rear template close to the rear template base plate side, one end of the first elastic piece is embedded in the first caulking groove, and the other end of the first elastic piece abuts against the rear template base plate.

Furthermore, a first assembling hole is formed in the side, away from the second rear template, of the rear template base plate, a first sliding hole which penetrates through the rear template base plate and is close to the second rear template side is formed in the bottom of the first assembling hole, the first distance adjusting piece comprises a first sliding rod which is slidably assembled in the first sliding hole, one end of the first sliding rod is fixedly connected to the second rear template, and a first limiting head which is fixedly connected to the other end of the first sliding rod and is slidably assembled in the first assembling hole, and the length of the first sliding rod is greater than the distance from the bottom of the first assembling hole to the side, close to the second rear template, of the rear template base plate.

Furthermore, the rear die base plate is fixedly connected with a first guide post extending towards the second rear die plate, a guide sleeve corresponding to the first guide post is arranged on the side, close to the rear die base plate, of the second rear die plate, and the first guide post is connected in the guide sleeve in a sliding mode.

Furthermore, an assembly through hole is formed in the second rear template in the thickness direction, a supporting plate is arranged on the side, away from the first rear template, of the assembly through hole, the ejection mechanism comprises a needle plate group assembled in the assembly through hole in a sliding mode along the die opening direction, an ejector pin fixed on the needle plate group and penetrating through the first rear template along the die opening direction, and a second elastic element arranged between the first rear template and the needle plate group, and the rear template plate and the supporting plate are both provided with ejector pin holes.

Further, the needle plate group comprises a surface needle plate close to the first rear template and a surface needle bottom plate superposed on the surface needle plate and facing away from the first rear template, one end of the ejector needle abuts against the surface needle bottom plate, the ejection mechanism further comprises a second guide post fixedly connected to the surface needle plate and extending towards the first rear template, the second guide post is slidably assembled on the first rear template, and the second elastic member is sleeved outside the second guide post.

Furthermore, the front mold assembly further comprises a second front mold plate arranged on the first front mold plate and departing from the rear mold assembly, a second spacing adjusting piece fixedly connected to the first front mold plate and departing from the rear mold assembly and slidably connected with the second front mold plate, a third elastic piece arranged between the first front mold plate and the second front mold plate, and a front mold insert pin assembly connected to the second front mold plate and close to the first front mold plate and extending to the first cavity.

Furthermore, a second assembling hole is formed in the side, away from the first front template, of the second front template, a second sliding hole penetrating through the second front template and close to the first front template is formed in the bottom of the second assembling hole, the second distance adjusting piece comprises a second sliding rod which is slidably assembled in the second sliding hole, one end of the second sliding rod is fixedly connected to the first front template, and a second limiting head which is fixedly connected to the other end of the second sliding rod and slidably assembled in the second assembling hole, and the length of the second sliding rod is greater than the distance from the bottom of the second assembling hole to the side, close to the first front template, of the second front template; a second caulking groove is formed in the side, close to the second front template, of the first front template, one end of the third elastic piece is embedded in the second caulking groove, and the other end of the third elastic piece abuts against the second front template.

Furthermore, an assembly groove is formed in the first front template on the side close to the second front template, and the front mold insert pin assembly comprises an insert pin fixing plate which is slidably assembled in the assembly groove along the mold opening direction, a front mold insert pin of which one end is fixedly connected to the insert pin fixing plate and the other end extends to the first cavity, and a fourth elastic piece connected between the insert pin fixing plate and the bottom of the assembly groove.

Further, the front mold assembly further comprises a third guide post fixedly connected to the second front mold plate and extending toward the rear mold assembly, and the first front mold plate is slidably connected to the third guide post.

Further, an injection molding method is provided, which is applied to the injection mold as described in any one of the above, and includes the following steps:

opening the mold: the rear die base plate moves towards the direction far away from the front die assembly in the process: in a first stage, the elastic force of the first elastic member separates the rear die holder plate and the rear die assembly by a predetermined distance, and the rear die insert pin separates the rear die insert pin from the slider structure as the rear die holder plate is moved away from the front die assembly; in the second stage, the rear die holder plate drives the rear die set to move towards the direction far away from the front die assembly through the first spacing adjusting piece, and the slider structure moves towards the direction far away from the die cavity until the slider structure is separated from the die cavity;

demolding: the ejection mechanism abuts against the product in the rear template group to enable the product to be separated from the rear template group;

die assembly: the rear die base plate moves towards the direction close to the front die assembly in the process: in the first stage, the first magnetic lock module and the second magnetic lock module are attracted, so that the rear template group is attached to the first front template, and in the attraction process, the sliding block structure moves towards the direction close to the mold cavity until the sliding block structure extends into the mold cavity; in the second stage, the rear die base plate continues to move towards the direction close to the front die assembly until the rear die base plate is attached to the rear die assembly, and the rear die insert pin moves along with the rear die base plate towards the direction far away from the front die assembly until the end part of the rear die insert pin abuts against the sliding block structure.

The invention has the beneficial effects that: in the initial stage of die opening, under the elastic action of the first elastic part and the action of the first distance adjusting part, the rear die base plate and the rear die plate group can be separated by a certain distance, and the rear die insert pin is fixed on the rear die base plate, so that the rear die insert pin can be far away from the front die assembly along with the rear die base plate, and the separation of the rear die insert pin and the slide block structure is realized; continuing to open the mold, and separating the first front template from the rear template set under the continuous action of the mold opening acting force, wherein the slide block structure is separated from the product in the process; and finally, the ejection mechanism abuts against the product to separate the product from the rear template group. In the process of die assembly, the ejection mechanism is released firstly; in the initial stage of die assembly, the rear die base plate and the rear die plate group are kept in a separated state under the elastic force action of the first elastic piece, and the first front die plate and the rear die plate group are firstly die assembled under the action of magnetic attraction, so that the slide block structure is driven to extend into the second cavity; and (4) continuing to mold, combining the rear mold base plate and the rear mold plate under the continuous action of mold closing force, and abutting the lower end part of the rear mold insert pin against the side deviating from the front mold assembly of the slide block structure under the driving of the rear mold base plate. The scheme can realize the actions of firstly drawing out the mold insert pin, then drawing out the slide block structure and finally ejecting the product in the demolding process, the demolding process is smooth and reliable, and the product molding quality can be improved; the scheme can realize the action of resetting the sliding block structure firstly and then resetting the rear die insert pin in the die closing process, so that a gap is not easy to generate between the sliding block structure and the rear die insert pin, the sliding block structure is not easy to damage the head of the rear die insert pin, and the forming quality can be ensured; the injection mold of the scheme has the advantages of simple structure, small occupied space, high reliability, high molding quality and low cost.

Drawings

FIG. 1 is a schematic view of the overall structure of the injection mold of the present invention;

FIG. 2 is a cross-sectional view of the injection mold of the present invention taken in the direction D-D of FIG. 1;

FIG. 3 is a cross-sectional view of the injection mold of the present invention taken along the direction E-E in FIG. 1;

FIG. 4 is a sectional view of the injection mold of the present invention in the direction F-F of FIG. 1;

FIG. 5 is a schematic perspective exploded view of a front mold assembly of the injection mold of the present invention;

FIG. 6 is a schematic perspective exploded view of a rear mold assembly of the injection mold of the present invention;

FIG. 7 is an enlarged view of a detail of section A of FIG. 2;

FIG. 8 is a schematic flow chart of the injection molding method of the present invention.

Detailed Description

The invention is further described with reference to the following figures and embodiments.

With reference to fig. 1 to 7, an injection mold is provided, which includes a front mold assembly 10 and a rear mold assembly 20 correspondingly matched with the front mold assembly 10, when the front mold assembly 10 and the rear mold assembly 20 are closed, the front mold assembly 10 and the rear mold assembly 20 cooperate to form a mold cavity 100, the front mold assembly 10 includes a first front mold plate 11 close to the rear mold assembly 20 and a first magnetic locking mold part 12 disposed on the peripheral side of the first front mold plate 11, and a first cavity 111 is formed on the side of the first front mold plate 11 close to the rear mold assembly 20; the rear mold assembly 20 comprises a rear mold plate group 21 close to the front mold assembly 10, a second magnetic lock mold 22 arranged on the periphery of the rear mold plate group 21 and corresponding to the first magnetic lock mold 12, an ejection mechanism 23 arranged in the rear mold plate group 21, a first spacing adjuster 24 connected to the rear mold plate group 21 on the side away from the front mold assembly 10, a rear mold plate 26 arranged on the rear mold plate group 21 on the side away from the front mold assembly 10, and a first elastic member 25 connected between the rear mold plate 26 and the rear mold plate group 21, the rear die plate 26 is slidably connected to the first spacing adjuster 24 along the opening direction, a second cavity 2111 is formed on the side of the rear die plate group 21 close to the front die assembly 10, a slider structure 213 capable of extending into the second cavity 2111 is arranged on the side of the rear die plate group 21 close to the front die assembly 10, a rear mold insert pin 261 which penetrates through the rear mold plate group 21 in the mold opening direction and can extend into the second cavity 2111 in a sliding manner is fixedly connected to the side, close to the rear mold plate group 21, of the rear mold plate 26; when the front mold assembly 10 and the rear mold assembly 20 are closed, one ends of the slider structure 213 and the rear mold insert 261 both extend into the mold cavity 100, and the end of the rear mold insert 261 abuts against the side of the slider structure 213 away from the front mold assembly 10.

In the initial stage of mold opening, under the elastic force of the first elastic member 25 and the effect of the first distance adjusting member 24, the rear mold base plate 26 and the rear mold plate group 21 are separated by a distance, and the rear mold insert pin 261 is fixed on the rear mold base plate 26, so that the rear mold insert pin 261 can be far away from the front mold assembly 10 along with the rear mold base plate 26, and separation of the rear mold insert pin 261 from the slider structure 213 is realized, in this stage, because the first magnetic lock mold part 12 and the second magnetic lock mold part 22 are respectively arranged on the peripheral sides of the first front mold plate 11 and the rear mold plate group 21, under the effect of magnetic attraction, the first front mold plate 11 and the rear mold plate group 21 can be kept in a mold closing state; continuing to open the mold, and separating the first front mold plate 11 from the rear mold plate group 21 under the continuous action of the mold opening acting force, wherein the slide block structure 213 is separated from the product in the process; finally, the ejection mechanism 23 pushes the product away from the rear set of mold plates 21. In the mold closing process, the ejection mechanism 23 is released firstly; in the initial stage of mold closing, the rear mold plate 26 and the rear mold plate group 21 are kept separated under the elastic force of the first elastic member 25, and the first front mold plate 11 and the rear mold plate group 21 are closed under the magnetic attraction force, so as to drive the slider structure 213 to extend into the second cavity 2111; and (3) continuing to mold, combining the rear mold base plate 26 and the rear mold plate 21 under the continuous action of mold clamping force, and abutting the lower end part of the rear mold insert 261 against the side, away from the front mold assembly 10, of the slide block structure 213 under the driving of the rear mold base plate 26. According to the scheme, the actions of firstly drawing out the die insert pin 261, then drawing out the slider structure 213 and finally ejecting out a product can be realized in the demolding process, the demolding process is smooth and reliable, and the product molding quality can be improved; according to the scheme, the action that the sliding block structure 213 resets firstly and then the rear die insert pin 261 resets can be realized in the die assembly process, so that a gap is not easy to generate between the sliding block structure 213 and the rear die insert pin 261, the sliding block structure 213 does not easily damage the head of the rear die insert pin 261, and the forming quality can be ensured; the injection mold of the scheme has the advantages of simple structure, small occupied space, high reliability, high molding quality and low cost.

The rear die plate group 21 includes a first rear die plate 211 close to the front die assembly 10 and a second rear die plate 212 arranged on the first rear die plate 211 and deviating from the front die assembly 10, the rear die plate base 26 is arranged on the second rear die plate 212 and deviates from the first rear die plate 211, a first caulking groove 2121 is arranged on the second rear die plate 212 close to the rear die plate base 26, one end of the first elastic element 25 is embedded in the first caulking groove 2121, and the other end of the first elastic element abuts against the rear die plate base 26. Specifically, the first elastic member 25 is a spring, the first elastic member 25 may be arranged in a central symmetry, and the number of the first elastic members 25 may be set according to practical situations, for example, four, six, eight, ten, and so on.

The side of the rear mold base plate 26 that deviates from the second rear mold plate 212 is provided with a first assembling hole 262, the bottom of the first assembling hole 262 is provided with a first sliding hole 263 that runs through the rear mold base plate 26 and is close to the side of the second rear mold plate 212, the first distance adjusting member 24 comprises a first sliding rod 241 that is slidably assembled in the first sliding hole 263 and one end of which is fixedly connected to the second rear mold plate 212 and a first limiting head 242 that is fixedly connected to the other end of the first sliding rod 241 and slidably assembled in the first assembling hole 262, and the length of the first sliding rod 241 is greater than the distance from the bottom of the first assembling hole 262 to the side of the rear mold base plate 26 that is close to the second rear mold plate 212. Specifically, the end of the first sliding bar 241 is provided with a screw, the first sliding bar 241 is connected with the second rear mold plate 212 by a screw, and the size of the distance between the rear mold plate 26 and the second rear mold plate 212 which can be opened can be adjusted by adjusting the first distance adjusting member 24. The number of the first distance adjusting members 24 may be set according to practical circumstances and arranged uniformly.

The rear mold base plate 26 is fixedly connected with a first guide post 264 extending toward the second rear mold plate 212, a guide sleeve 2122 corresponding to the first guide post 264 is arranged on the side of the second rear mold plate 212 close to the rear mold base plate 26, and the first guide post 264 is slidably connected in the guide sleeve 2122. The first guide post 264 and the guide sleeve 2122 are slidably assembled, so that the direction accuracy of the relative movement between the rear mold plate 26 and the second rear mold plate 212 can be ensured.

The injection mold may be provided in a one-mold one-cavity or one-mold multi-cavity form, in this embodiment in a one-mold two-cavity form. According to the actual conditions of the product, the quantity of the rear die insert pins 261 can be adaptively adjusted, in the scheme, one product is correspondingly provided with two rear die insert pins 261, in the scheme, the rear die insert pins 261 penetrate through the second rear die plate 212 side deviating from the rear die seat plate 26, the mode that the top plate 265 is fixed to abut against the end part of the rear die insert pins 261 through the second rear die plate 212 side deviating from the rear die seat plate 26 is fixed, and the fixing mode of the rear die insert pins 261 and the rear die seat plate 26 can be adaptively adjusted according to the actual conditions.

An assembly through hole 2123 is formed in the thickness direction of the second rear template 212, a supporting plate 2124 is arranged on the side, deviating from the first rear template 211, of the assembly through hole 2123, the ejection mechanism 23 includes a needle plate group 231 assembled in the assembly through hole 2123 in a sliding manner along the mold opening direction, an ejector pin 232 fixed to the needle plate group 231 and penetrating through the first rear template 211 along the mold opening direction, and a second elastic element 233 arranged between the first rear template 211 and the needle plate group 231, and the rear template plate 26 and the supporting plate 2124 are both provided with ejector pin holes 200. The needle plate group 231 includes a needle plate 2311 close to the first rear mold plate 211, a needle bottom plate 2312 superposed on the needle plate 2311 and away from the first rear mold plate 211, one end of the thimble 232 abuts against the needle bottom plate 2312, the ejector mechanism 23 further includes a second guide post 23111 fixedly connected to the needle plate 2311 and extending towards the first rear mold plate 211, the second guide post 23111 is slidably assembled on the first rear mold plate 211, and the second elastic member 233 is sleeved outside the second guide post 23111. During demolding, the top roller penetrates through the top roller hole 200 and abuts against the top surface needle bottom plate 2312, so that the surface needle plate 2311 and the surface needle bottom plate 2312 slide in the assembling through hole 2123, the ejector pins 232 abut against a product under the driving of the surface needle plate 2311, and the product is separated from the first rear mold plate 211; after the ejector rod is withdrawn, under the action of the second elastic member 233, the needle plate group 231 moves away from the first rear mold plate 211, so as to drive the ejector pin 232 to return, that is, the ejector pin 232 can be reset before the slider structure 213 is reset.

The front mold assembly 10 further includes a second front mold plate 13 disposed on the side of the first front mold plate 11 away from the rear mold assembly 20, a second spacing adjusting member 14 fixedly connected to the side of the first front mold plate 11 away from the rear mold assembly 20 and slidably connected to the second front mold plate 13, a third elastic member 15 disposed between the first front mold plate 11 and the second front mold plate 13, and a front mold insert pin assembly 16 connected to the second front mold plate 13 near the side of the first front mold plate 11 and extending to the first cavity 111. The first front mold plate 11 has a mounting groove 113 formed at a side thereof adjacent to the second front mold plate 13, and the front mold insert pin assembly 16 includes an insert pin fixing plate 161 slidably mounted in the mounting groove 113 in a mold opening direction, a front mold insert pin 162 having one end fixedly coupled to the insert pin fixing plate 161 and the other end extended toward the first cavity 111, and a fourth elastic member 163 coupled between the insert pin fixing plate 161 and a bottom of the mounting groove 113. In the same stage of withdrawing the rear mold insert 261 from the product, that is, in the initial stage of mold opening, the first front mold plate 11 and the second front mold plate 13 are separated by the elastic force of the third elastic member 15, the insert pin fixing plate 161 is away from the bottom of the assembly groove 113 by the elastic force of the fourth elastic member 163, and the front mold insert pin 162 is drawn away from the product by the insert pin fixing plate 161, so that it can be seen that the front mold insert pin 162 can be drawn away from the product before the slider structure 213 is drawn away, so that the mold opening reliability of the product is higher.

A second assembling hole 131 is formed in the side, away from the first front template 11, of the second front template 13, a second sliding hole 132 penetrating through the second front template 13 and close to the first front template 11 is formed in the bottom of the second assembling hole 131, the second spacing adjusting piece 14 comprises a second sliding rod 141 which is slidably assembled in the second sliding hole 132 and one end of which is fixedly connected to the first front template 11, and a second limiting head 142 which is fixedly connected to the other end of the second sliding rod 141 and slidably assembled in the second assembling hole 131, and the length of the second sliding rod 141 is greater than the distance from the bottom of the second assembling hole 131 to the side, close to the first front template 11, of the second front template 13; a second caulking groove 112 is formed in the side, close to the second front template 13, of the first front template 11, one end of the third elastic element 15 is embedded in the second caulking groove 112, and the other end of the third elastic element abuts against the second front template 13.

The front mold assembly 10 further includes a third guide post 133 fixedly connected to the second front mold plate 13 and extending toward the rear mold assembly 20, and the first front mold plate 11 is slidably connected to the third guide post 133, so as to ensure accurate position when the first front mold plate 11 and the second front mold plate 13 move relatively.

With reference to fig. 8, an injection molding method applied to the injection mold described above is provided, which includes the following steps:

s100, opening the mold: during movement of the rear die plate 26 away from the front die assembly 10:

s101, in a first stage, the elastic force of the first elastic member 25 separates the rear die plate 26 and the rear die set 21 by a predetermined distance, and the rear die insert pin 261 separates the rear die insert pin 261 from the slider structure 213 as the rear die plate 26 moves away from the front die assembly 10;

s102, in the second stage, the rear mold base plate 26 drives the rear mold base plate set 21 to move towards a direction away from the front mold assembly 10 through the first distance adjusting member 24, and the slider structure 213 moves towards a direction away from the mold cavity 100 until the slider structure is separated from the mold cavity 100;

s200, demolding: the ejection mechanism 23 abuts against the product in the rear template group 21, so that the product is separated from the rear template group 21;

s300, mold closing:

during the movement of the rear die plate 26 in the direction approaching the front die assembly 10:

s301, in the first stage, the first magnetic lock module 12 and the second magnetic lock module 22 are attracted to each other, so that the rear mold plate set 21 is attached to the first front mold plate 11, and in the attraction process, the slider structure 213 moves toward the direction close to the mold cavity 100 until it extends into the mold cavity 100;

s302, in the second stage, the rear mold base plate 26 continues to move toward the direction close to the front mold assembly 10 until the rear mold base plate fits to the rear mold group 21, and the rear mold insert 261 moves along with the rear mold base plate 26 toward the direction away from the front mold assembly 10 until the end of the rear mold insert 261 abuts against the slider structure 213.

While the foregoing is directed to embodiments of the present invention, it will be understood by those skilled in the art that various changes may be made without departing from the spirit and scope of the invention.

Claims (11)

1. The utility model provides an injection mold, including preceding mould subassembly and with preceding mould subassembly corresponds the back mould subassembly that matches, preceding mould subassembly with when the back mould subassembly compound die preceding mould subassembly with back mould subassembly cooperation forms the mould cavity, its characterized in that:

the front die assembly comprises a first front die plate close to the rear die assembly and a first magnetic locking die part arranged on the peripheral side of the first front die plate, and a first cavity is formed in the side, close to the rear die assembly, of the first front die plate;

the back die assembly includes being close to the back die plate group of front die assembly, set up in week side of back die plate group and with second magnetism locking module that first magnetism locking module position corresponds, set up in ejection mechanism in the back die plate group, connect in deviating from of back die plate group the first interval regulating part of front die assembly side, set up in deviating from of back die plate group the back die plate board of front die assembly side, and connect in back die plate with first elastic component between the back die plate group, back die plate along die sinking direction sliding connection in first interval regulating part, being close to of back die plate group second die cavity is seted up to front die assembly side, being close to of back die plate group front die assembly side sets up can stretch into the slider structure in the second die cavity, being close to of back die plate group side fixedly connected with along the die sinking direction wear to locate back die plate group and can slide and stretch into the back die plate group in the second die cavity Inserting a needle;

when the front die assembly and the rear die assembly are assembled, one ends of the sliding block structures and the rear die insert pins extend into the die cavity, and the end parts of the rear die insert pins abut against the side, deviating from the front die assembly, of the sliding block structures.

2. The injection mold of claim 1, wherein the rear mold plate set comprises a first rear mold plate close to the front mold assembly and a second rear mold plate arranged on the first rear mold plate and facing away from the front mold assembly, the rear mold plate base plate is arranged on the side of the second rear mold plate facing away from the first rear mold plate, a first caulking groove is formed on the side of the second rear mold plate close to the rear mold base plate, one end of the first elastic member is embedded in the first caulking groove, and the other end of the first elastic member abuts against the rear mold plate base plate.

3. The injection mold according to claim 2, wherein a first assembly hole is formed in a side of the rear mold base plate facing away from the second rear mold base plate, a first slide hole penetrating the rear mold base plate and facing toward the second rear mold base plate is formed in a bottom of the first assembly hole, the first distance adjusting member comprises a first slide rod slidably fitted in the first slide hole and having one end fixedly connected to the second rear mold base plate, and a first stopper fixedly connected to the other end of the first slide rod and slidably fitted in the first assembly hole, and a length of the first slide rod is greater than a distance from the bottom of the first assembly hole to a side of the rear mold base plate facing toward the second rear mold base plate.

4. An injection mold as claimed in claim 3, wherein said rear mold plate is fixedly connected with a first guide post extending towards said second rear mold plate, a guide sleeve corresponding to said first guide post is provided on the side of said second rear mold plate close to said rear mold plate, and said first guide post is slidably connected in said guide sleeve.

5. The injection mold according to claim 2, wherein the second rear mold plate is provided with an assembly through hole in a thickness direction, a support plate is arranged on a side of the assembly through hole, which is away from the first rear mold plate, the ejection mechanism comprises a needle plate group which is slidably assembled in the assembly through hole along an opening direction, an ejector pin which is fixed to the needle plate group and penetrates through the first rear mold plate along the opening direction, and a second elastic member which is arranged between the first rear mold plate and the needle plate group, and the rear mold plate and the support plate are both provided with ejector pin holes.

6. An injection mold according to claim 5, wherein the needle plate set comprises a face needle plate close to the first rear mold plate and a face needle base plate superposed on the face needle plate and facing away from the first rear mold plate, one end of the ejector pin abuts against the face needle base plate, the ejector mechanism further comprises a second guide post fixedly connected to the face needle plate and extending toward the first rear mold plate, the second guide post is slidably assembled to the first rear mold plate, and the second elastic member is sleeved outside the second guide post.

7. An injection mold according to any one of claims 1-6, wherein the front mold assembly further comprises a second front mold plate disposed on a side of the first front mold plate facing away from the rear mold assembly, a second spacing adjustment member fixedly connected to the side of the first front mold plate facing away from the rear mold assembly and slidably connected to the second front mold plate, a third elastic member disposed between the first front mold plate and the second front mold plate, and a front mold insert pin assembly connected to the second front mold plate adjacent to the side of the first front mold plate and extending toward the first cavity.

8. The injection mold according to claim 7, wherein a second assembly hole is formed in a side of the second front mold plate, which is away from the first front mold plate, a second slide hole penetrating through the second front mold plate and close to the first front mold plate is formed in a bottom of the second assembly hole, the second distance adjusting member comprises a second slide rod slidably fitted in the second slide hole and having one end fixedly connected to the first front mold plate, and a second limiting head fixedly connected to the other end of the second slide rod and slidably fitted in the second assembly hole, and a length of the second slide rod is greater than a distance from the bottom of the second assembly hole to the side of the second front mold plate, which is close to the first front mold plate; a second caulking groove is formed in the side, close to the second front template, of the first front template, one end of the third elastic piece is embedded in the second caulking groove, and the other end of the third elastic piece abuts against the second front template.

9. The injection mold according to claim 7, wherein the first front mold plate is provided with a mounting groove on a side thereof adjacent to the second front mold plate, and the front mold insert assembly includes an insert pin fixing plate slidably mounted in the mounting groove in a mold opening direction, a front mold insert pin fixedly connected to the insert pin fixing plate at one end thereof and extending toward the first cavity at the other end thereof, and a fourth elastic member connected between the insert pin fixing plate and a bottom of the mounting groove.

10. An injection mold according to claim 7, wherein said front mold assembly further comprises a third guide post fixedly connected to said second front mold plate and extending toward said rear mold assembly, said first front mold plate being slidably connected to said third guide post.

11. An injection molding method applied to the injection mold according to any one of claims 1 to 10, comprising the steps of:

opening the mold: the rear die base plate moves towards the direction far away from the front die assembly in the process: in a first stage, the elastic force of the first elastic member separates the rear die holder plate and the rear die assembly by a predetermined distance, and the rear die insert pin separates the rear die insert pin from the slider structure as the rear die holder plate is moved away from the front die assembly; in the second stage, the rear die holder plate drives the rear die set to move towards the direction far away from the front die assembly through the first spacing adjusting piece, and the slider structure moves towards the direction far away from the die cavity until the slider structure is separated from the die cavity;

demolding: the ejection mechanism abuts against the product in the rear template group to enable the product to be separated from the rear template group;

die assembly: the rear die base plate moves towards the direction close to the front die assembly in the process: in the first stage, the first magnetic lock module and the second magnetic lock module are attracted, so that the rear template group is attached to the first front template, and in the attraction process, the sliding block structure moves towards the direction close to the mold cavity until the sliding block structure extends into the mold cavity; in the second stage, the rear die base plate continues to move towards the direction close to the front die assembly until the rear die base plate is attached to the rear die assembly, and the rear die insert pin moves along with the rear die base plate towards the direction far away from the front die assembly until the end part of the rear die insert pin abuts against the sliding block structure.

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