CN219883177U - Make double-colored product paste more inseparable mould of moulding plastics - Google Patents

Abstract

The utility model discloses a die for enabling injection molding and pasting of a double-color product to be tighter, which comprises a front die and a rear die which are matched with each other, wherein the front die comprises a first front die core, a second front die core, a first nozzle group and a second nozzle group, the rear die comprises two rear die cores which are symmetrically arranged and have the same structure, the rear die also comprises two movable floating plates, two groups of driving mechanisms and two groups of floating needles, the number of each group of floating needles is multiple, the upper ends of the two groups of floating needles respectively penetrate through the two rear die cores, and one group of floating needles extend into a first cavity to enable a first color injection molding part to form a glue running channel with an inverted structure. The more inseparable mould of laminating is moulded plastics to both hands product during this time, through setting up floating plate, floating needle and actuating mechanism and cooperateing, makes first color injection molding form the gluey passageway that walks that has the back-off structure to this second color injection molding can form cylindricality back-off structure through walking gluey passageway with first color injection molding, the laminating degree of the little double-colored product of reinforcing body and area improves the quality of this kind of product.

Description

Make double-colored product paste more inseparable mould of moulding plastics

Technical Field

The utility model relates to the technical field of dies, and particularly discloses a die for enabling injection molding and adhesion of a double-color product to be tighter.

Background

Double-shot molding refers to a molding process in which two different materials are injected into the same set of mold, thereby realizing that the injection molded part is formed by the two materials. Some materials are different in color, and some materials are different in hardness, so that the attractiveness, assembly and other performances of the product are improved. The double-color injection molding technology is mainly applied to the fields of household appliances, daily plastic products, automobile part manufacturing and the like, and is a novel injection molding technology capable of simplifying assembly process and improving the appearance grade of the products.

In the injection molding production of the existing bicolor plastic part, in order to improve the efficiency and simplify the production, two sets of front molds respectively used for molding the first color and the second color are arranged, and the cavities of the two sets of front molds are different and have different structures so as to facilitate the embedding of materials during bicolor injection; and two rear molds with identical cavities are arranged at the same time. During injection molding production, two sets of molds are produced simultaneously, and after the first injection molding is finished, the rear mold rotates 180 degrees and forms a complete set of molds with the front mold of the second cavity for the second injection molding. Because of the adoption of double-color injection, the combination firmness between two materials is an important technical index, and the outer layer materials are tightly hooped on the embedded primary injection part by utilizing the shrinkage between different materials, the actual combination is not firm enough due to the fluctuation of the technological parameters in the actual production, the service life of the product is seriously influenced, and even waste products are directly caused.

The existing solution is that a slide block is arranged in a die to enable a first injection piece to form an inverted structure, the slide block is withdrawn before a second injection, and the inverted structure is filled up by the second injection, so that two injection pieces can be closely attached. However, the structure and the method are not suitable for the double-shot injection molding product with small bonding area, and the movable structure of the sliding block is difficult to accurately and reasonably set, so that how to enhance the bonding degree of the double-shot injection molding product with small bonding area becomes a problem to be solved urgently.

Disclosure of Invention

In order to overcome the defects and the shortcomings in the prior art, the utility model aims to provide a die for enabling a bicolor product to be subjected to injection molding and adhesion more tightly, and the adhesion degree of the bicolor injection product with small adhesion area is enhanced by modifying the internal structure of the die.

In order to achieve the above purpose, the utility model provides a mold for enabling a double-color product to be more tightly adhered by injection molding, comprising a front mold and a rear mold which are matched with each other, wherein the front mold comprises a first front mold core, a second front mold core, a first nozzle group and a second nozzle group, the rear mold comprises two rear mold cores which are symmetrically arranged and have the same structure, the first front mold core is matched with one of the rear mold cores to form a first cavity, the second front mold core is matched with the other rear mold core to form a second cavity, the first nozzle group is used for injecting a first-color injection molding fluid into the first cavity, and the second nozzle group is used for injecting a second-color injection molding fluid into the second cavity; the back mould still includes two floating mechanisms, and two floating mechanisms and two back mold cores one-to-one setting, and floating mechanism is used for floating so that first injection molding forms the gluey passageway of going when back mold core shaping first color injection molding.

The floating mechanism comprises a movable floating plate, a group of driving mechanisms and a group of floating needles, and the floating plate is used for installing the floating needles;

the number of each group of driving mechanisms is four, and the four driving mechanisms are respectively arranged at four corners of the floating plate and used for driving the floating plate to move;

the number of each group of floating needles is multiple, the upper ends of the two groups of floating needles penetrate through the two rear mold cores respectively, and one group of floating needles extend into the first cavity so that the first color injection molding piece forms a glue running channel with a back-off structure.

Specifically, the front mould comprises a front mould plate, two pouring gate seats and a front mould base which are sequentially connected, the quantity of the pouring gate seats is two, the two pouring gate seats are respectively used for fixedly mounting a first nozzle group and a second nozzle group, and the front mould base is used for fixedly mounting a first front mould core and a second front mould core.

Specifically, the front mold further comprises a front mold insert and a plurality of core needles, wherein the front mold insert is arranged on the first front mold core and forms the first cavity with one of the rear mold cores, the plurality of core needles are arranged on the first front mold core and penetrate through the front mold insert, the number of the core needles is smaller than or equal to that of a group of floating needles, each core needle is arranged corresponding to one floating needle and has the same axis, and the core needles are used for enabling the first color injection molding piece to form a glue running channel capable of injecting fluid for second color injection molding.

Specifically, the front mould still includes two locating levers, and the one end of two locating levers is installed in the front mould base, and the other end of two locating levers inserts and locates the back mould, and two locating levers all are located the one side that first front mould core is close to the preceding mould core of second, and the back mould is provided with the locating hole that is used for holding the locating lever, carries out the compound die location after the locating lever is used for the back mould to rotate.

Specifically, the back mould still includes bottom plate, mould foot, back template and the back die holder that connects gradually, and the quantity of mould foot is three, and three mould foot interval sets up and forms two movable spaces between bottom plate and the back template, and the back die holder is used for two back mold cores of fixed mounting, and the bottom of back die holder is provided with the space of stepping down that is used for holding the activity of floating plate, and floating plate is connected in the back die holder via the guide swing joint.

Specifically, the driving mechanism comprises a push rod, a lever and a hinge piece, wherein the push rod is movably inserted into the rear die holder, the lever is hinged to the rear die plate through the hinge piece, one end of the lever is abutted against the bottom end of the push rod, and the other end of the lever is abutted against the bottom of the floating plate.

Specifically, four abdication holes and four cushion blocks are arranged at the bottom of the front die holder, and the four abdication holes are arranged around the second front die core and are used for accommodating the top end of the ejector rod; four cushion blocks are arranged around the first front mold core and are used for propping against the top end of the ejector rod.

Specifically, the rear mould further comprises two ejection mechanisms, the two ejection mechanisms are movably arranged in the two movable spaces respectively, and the two ejection mechanisms are used for ejecting products.

The utility model has the beneficial effects that: the utility model relates to a die for enabling injection molding and pasting of a double-color product to be tighter, which comprises a front die and a rear die which are matched with each other, wherein the front die comprises a first front die core, a second front die core, a first nozzle group and a second nozzle group, the rear die comprises two rear die cores which are symmetrically arranged and have the same structure, and the rear die also comprises two movable floating plates, two groups of driving mechanisms and two groups of floating needles. In actual production, the front mould and the rear mould are clamped, at the moment, the floating plate corresponding to the first cavity is driven by the driving mechanism to move upwards, so that a corresponding group of floating needles extend into the first cavity, the first nozzle group injects first color injection molding fluid into the first cavity, the floating plate and the floating needles corresponding to the second cavity do not act, the second nozzle group does not work, and the floating needles enable the first color injection molding part to form a glue running channel with a back-off structure; after the first color injection part is cooled and molded, the front mold and the rear mold are opened, the rear mold rotates 180 degrees and then is clamped with the front mold again, at the moment, the second cavity of the cavity is changed into the first cavity, the corresponding floating plate is driven by the driving mechanism to move upwards, so that a corresponding group of floating needles extend into the first cavity, the first nozzle group injects first color injection fluid into the first cavity, the cavity with the first injection part is the second cavity, the corresponding floating plate is not driven by the driving mechanism to reset any more, the group of floating needles withdraw from the first color injection part, the second nozzle group injects second color injection fluid into the second cavity, and the second color injection fluid flows into a glue-moving channel filled with the first color injection part to be cooled and molded, so that the first color injection part and the second color injection part are tightly attached to form an integral product which is not divided. The more inseparable mould of laminating is moulded plastics to both hands product during this time, through setting up floating plate, floating needle and actuating mechanism and cooperateing, makes first color injection molding form the gluey passageway that walks that has the back-off structure to this second color injection molding can form cylindricality back-off structure through walking gluey passageway with first color injection molding, the laminating degree of the little double-colored product of reinforcing body and area improves the quality of this kind of product.

Drawings

FIG. 1 is a schematic perspective view of the present utility model;

FIG. 2 is a schematic cross-sectional view of A-A of FIG. 1 according to the present utility model;

FIG. 3 is a schematic cross-sectional view of the structure B-B in FIG. 1 according to the present utility model;

FIG. 4 is a schematic view of the partial structure of C in FIG. 2 according to the present utility model;

FIG. 5 is a schematic view of the partial structure of D in FIG. 2 according to the present utility model;

FIG. 6 is a schematic view of the part of the structure of E in FIG. 3 according to the present utility model;

FIG. 7 is a schematic view of the partial structure of F in FIG. 6 according to the present utility model;

fig. 8 is a schematic perspective view of a floating mechanism according to the present utility model.

The reference numerals include:

1-front mould 10-first front mould core 11-second front mould core

12-first nozzle group 13-second nozzle group 14-front template

15-runner seat 16-front die holder 161-yielding hole

162-cushion block 17-front mould insert 18-core needle

19-locating lever

2-rear mould 20-rear mould core 201-positioning hole

21-floating plate 22-driving mechanism 221-ejector rod

222-lever 223-hinge 23-floating needle

24-bottom plate 25-die leg 26-rear die plate

27-rear die holder 28-ejection mechanism

3-two-color product 31-first color injection molding 32-second color injection molding.

Detailed Description

The present utility model will be further described with reference to examples and drawings, which are not intended to be limiting, for the understanding of those skilled in the art.

Referring to fig. 1 to 8, a mold for making a two-color product more tightly adhered by injection molding of the present utility model includes a front mold 1 and a rear mold 2 that are matched with each other, wherein the front mold 1 includes a first front mold core 10, a second front mold core 11, a first nozzle group 12 and a second nozzle group 13, the shape of the first front mold core 10 is different from the shape of the second front mold core 11, and the first front mold core 10 needs to be provided with a columnar structure to form a hole structure of a first injection molding 31; the rear mold 2 comprises two rear mold cores 20 which are symmetrically arranged and have the same structure, a first front mold core 10 is matched with one rear mold core 20 to form a first cavity, a second front mold core 11 is matched with the other rear mold core 20 to form a second cavity, a first nozzle group 12 is used for injecting a first color injection fluid into the first cavity, and a second nozzle group 13 is used for injecting a second color injection fluid into the second cavity. The first nozzle set 12 and the second nozzle set 13 are respectively connected to different single-color injection molding machines, in this embodiment, the first nozzle set 12 and the second nozzle set 13 each include two nozzles, and one rear mold core 20 is provided with two cavities with the same structure, so that two products can be produced at a time.

In actual production, the first front mold core 10 and one rear mold core 20 form a first cavity, the first nozzle group 12 injects a first color injection fluid into the first cavity, the second front mold core 11 and the other rear mold core 20 form a second cavity, and the second nozzle group 13 does not inject a second color injection fluid into the second cavity; after the injection molding fluid in the first cavity is cooled and molded into a first color injection molding piece 31, the front mold 1 and the rear mold 2 are opened, the rear mold 2 rotates 180 degrees and then is combined with the front mold 1 again, at this time, the first front mold core 10 and the rear mold core 20 without the injection molding piece form a new first cavity, the second front mold core 11 and the rear mold core 20 containing the first color injection molding piece 31 form a new second cavity, the first nozzle group 12 injects the first color injection molding fluid into the new first cavity, and the second nozzle group 13 injects the second color injection molding fluid into the new second cavity; after the injection molding fluid in the first cavity and the second cavity is cooled and molded, the front mold 1 and the rear mold 2 are opened again, the double-color injection molding product in the second cavity is demolded, the rear mold 2 is rotated 180 degrees again, and the steps are repeated to carry out cyclic production.

The rear mold 2 further comprises two floating mechanisms, the two floating mechanisms are arranged in one-to-one correspondence with the two rear mold cores 20, and the floating mechanisms are used for floating when the rear mold cores 20 form the first color injection molding piece so that the first injection molding piece forms a glue running channel. As shown in fig. 8, the floating mechanism includes a movable floating plate 21, a set of driving mechanisms 22, and a set of floating needles 23, and the floating plate 21 is used for mounting the floating needles 23. When the front mould 1 and the rear mould 2 are closed, the front mould 1 triggers a group of driving mechanisms 22 corresponding to the first front mould core 10, so that the driving mechanisms 22 drive the corresponding floating plates 21 to move close to the front mould 1, and a group of floating needles 23 on the floating plates 21 are driven to be inserted into the first cavity; the driving mechanism 22 corresponding to the second front mold core 11 is not triggered, so that the floating plate 21 corresponding to the driving mechanism is not moved, and the floating needle 23 on the floating plate 21 is not inserted into the second cavity and only stays in the rear mold core 20.

The number of each group of driving mechanisms 22 is four, and the four driving mechanisms 22 are respectively arranged at four corners of the floating plate 21 and are used for driving the floating plate 21 to move; each floating plate 21 is correspondingly provided with four driving mechanisms 22, the four driving mechanisms 22 are arranged at four corners, and the four driving mechanisms 22 simultaneously drive the floating plates 21 to move, so that the floating plates 21 move more stably, the group of floating needles 23 move stably, and the floating needles 23 are protected from being damaged.

The number of each group of floating needles 23 is multiple, the upper ends of the two groups of floating needles 23 respectively penetrate through the two rear mold cores 20, and one group of floating needles 23 extend into the first cavity to enable the first color injection molding piece 31 to form a glue running channel with a back-off structure. A group of floating needles 23 arranged corresponding to the first front mold core 10 extend into the first cavity and are matched with the columnar structure of the first front mold core 10, so that after the first cavity is filled with the first color injection molding fluid, a first color injection molding part 31 formed by cooling is provided with a glue running channel with a back-off structure; when the back mold 2 is opened and turned 180 degrees to close the mold again, a group of floating needles 23 extending into the holes of the first color injection molding piece 31 withdraw from the first color injection molding piece 31, so that the second color injection molding fluid enters the glue-moving channel, and then the second color injection molding fluid is cooled and molded into a columnar back-off structure, so that the first color injection molding piece 31 and the second color injection molding piece 32 are tightly attached to form a two-color product 3.

In actual production, the front mold 1 and the rear mold 2 are closed, at this time, the floating plate 21 corresponding to the first cavity is driven by the driving mechanism 22 to move upwards, so that a corresponding group of floating needles 23 extend into the first cavity, the first nozzle group 12 injects the first color injection fluid into the first cavity, the floating plate 21 and the floating needles 23 corresponding to the second cavity do not act, the second nozzle group 13 does not work, and the floating needles 23 can enable the first color injection part 31 to form a hole with a back-off structure; after the first color injection part 31 is cooled and molded, the front mold 1 and the rear mold 2 are opened, the rear mold 2 rotates 180 degrees and then is clamped with the front mold 1 again, at this time, the second cavity of the cavity is changed into the first cavity, the corresponding floating plate 21 is driven by the driving mechanism 22 to move upwards, so that a corresponding group of floating needles 23 extend into the first cavity, the first nozzle group 12 injects the first color injection fluid into the first cavity, the cavity with the first injection part is the second cavity, the corresponding floating plate 21 is not driven by the driving mechanism 22 to reset any more, the group of floating needles 23 withdraws from the first color injection part 31, the second nozzle group 13 injects the second color injection fluid into the glue-running channel filled with the first color injection part 31 for cooling and molding, and therefore the first color injection part 31 and the second color injection part 32 are tightly adhered to form an integral product which is not separable.

Referring to fig. 1 to 3, the front mold 1 includes a front mold plate 14, a runner seat 15 and a front mold base 16, which are sequentially connected, the number of runner seats 15 is two, the two runner seats 15 are respectively used for fixedly mounting the first nozzle set 12 and the second nozzle set 13, and the front mold base 16 is used for fixedly mounting the first front mold core 10 and the second front mold core 11. The two runner seats 15 are respectively arranged in a left-right matching manner corresponding to the positions of the first front mold core 10 and the second front mold core 11, in this embodiment, the gate for communicating the first nozzle group 12 is arranged on one side of the runner seat 15 for mounting the first nozzle group 12, and the gate for communicating the second nozzle group 13 and the injection molding machine is arranged on the front mold plate 14.

Referring to fig. 5, in the present embodiment, the front mold 1 further includes a front mold insert 17 and a plurality of core pins 18, the front mold insert 17 is disposed on the first front mold core 10 and forms the first cavity with one of the rear mold cores 20, the plurality of core pins 18 are mounted on the first front mold core 10 and penetrate through the front mold insert 17, the number of the core pins 18 is less than or equal to the number of a set of floating pins 23, each core pin 18 is disposed corresponding to one floating pin 23 and has the same axis, and the core pins 18 are used for forming a glue path for injecting the second color injection fluid into the first color injection molding 31. The number of the front mold inserts 17 is two, and the front mold inserts 17 correspond to two cavities of one rear mold 2 respectively, and the columnar structure required to be set by the first front mold core 10 is replaced by a plurality of core pins 18 and the protruding columns arranged on the front mold inserts 17 in this embodiment, so that the production and the processing of the first front mold core 10 are facilitated. The diameter of the core pin 18 and the diameter of the convex column are smaller than the diameter of the floating pin 23, the convex column of the core pin 18 or/and the front mould insert 17 is in propping fit with the floating pin 23, so that the aperture formed by the first injection molding piece 31 is small at the top and large at the bottom, the second injection molding fluid flows into the glue running channel to be cooled to form a column with the small diameter at the top and large at the bottom, the column of the second injection molding piece 32 is matched with the hole of the first injection molding piece 31 in a reverse buckling manner, and the first injection molding piece and the second injection molding piece are tightly adhered.

Referring to fig. 2 and 5, the front mold 1 further includes two positioning rods 19, one ends of the two positioning rods 19 are mounted on the front mold base 16, the other ends of the two positioning rods 19 are inserted into the rear mold 2, the two positioning rods 19 are located at one side of the first front mold core 10 close to the second front mold core 11, the rear mold 2 is provided with positioning holes 201 for accommodating the positioning rods 19, and the positioning rods 19 are used for mold clamping and positioning after the rear mold 2 rotates. The back mould 2 is provided with four locating holes 201, and four locating holes 201 are set up in the inboard of two back mould cores 20 in pairs, and in the injection moulding process, the die sinking, when the back mould 2 rotates 180 degrees back and the compound die again, the cooperation of two locating levers 19 and locating holes 201 can make front mould 1 and back mould 2 accurate compound die, ensures the precision and the quality of product.

Referring to fig. 1 to 3, the rear mold 2 further includes a bottom plate 24, mold pins 25, a rear mold plate 26 and a rear mold base 27 sequentially connected, the number of the mold pins 25 is three, the three mold pins 25 are arranged at intervals to form two movable spaces between the bottom plate 24 and the rear mold plate 26, the rear mold base 27 is used for fixedly mounting two rear mold cores 20, a yielding space for accommodating the floating plate 21 is arranged at the bottom of the rear mold base 27, and the floating plate 21 is movably connected to the rear mold base 27 through a guide piece. The positioning holes 201 penetrate through the rear mold core 20, the rear mold base 27 and the rear mold plate 26, the bottom plate 24 is connected with a central shaft, the central shaft penetrates through the middle mold leg 25 and the rear mold plate 26 and is connected with the rear mold base 27 at the end part, the two rear mold cores 20 and the four positioning holes 201 are symmetrically arranged at the axis center point of the central shaft, and the whole rear mold 2 rotates around the axis of the central shaft.

Referring to fig. 6 to 8, the driving mechanism 22 includes a push rod 221, a lever 222 and a hinge member 223, wherein the push rod 221 is movably inserted into the rear mold base 27, the lever 222 is hinged to the rear mold plate 26 via the hinge member 223, one end of the lever 222 contacts with the bottom end of the push rod 221, and the other end of the lever 222 contacts with the bottom of the floating plate 21. The ejector rod 221 is propped against one end of the lever 222 by the front mould 1 to apply pressure to the corresponding group of driving mechanisms 22 of the first front mould core 10, and the other end of the lever 222 prizes the floating plate 21 to approach the rear mould core 20, so that the group of floating needles 23 are driven to be inserted into the first cavity; the corresponding set of driving mechanisms 22 of the second front mold core 11 is not in contact with the front mold 1, so that the ejector rod 221 and the lever 222 are in a static state, and the floating plate 21 and the floating needle 23 are in a starting position.

Referring to fig. 6, four relief holes 161 and four pads 162 are provided at the bottom of the front mold base 16, and the four relief holes 161 are disposed around the second front mold core 11 and are used for accommodating the top ends of the ejector pins 221; four pads 162 are provided around the first front mold core 10 and are used to abut against the top ends of the ejector pins 221. When the mold is closed, the four cushion blocks 162 simultaneously support against the top ends of the corresponding ejector rods 221, so that the ejector rods 221 apply pressure to one end of the lever 222, and the other end of the lever 222 prizes the floating plate 21 to approach the rear mold core 20, thereby driving the group of floating pins 23 to be inserted into the first mold cavity; the floating plate 21 and the floating needle 23 corresponding to the second front mold core 11 are at the initial position, the floating plate 21 presses one end of the lever 222, the other end of the lever 222 props against the ejector rod 221, and the upper end of the ejector rod 221 extends into the abdication hole 161. When the front die 1 and the rear die 2 are opened and the rear die 2 is rotated to be clamped again, the four abdicating holes 161 and the four cushion blocks 162 are exchanged relative to the rear die 2, and the moving states of the two groups of driving mechanisms 22 are opposite to the states, so that the alternating work is realized.

Referring to fig. 1 to 3, the rear mold 2 further includes two ejector mechanisms 28, the two ejector mechanisms 28 are movably disposed in the two movable spaces, and the two ejector mechanisms 28 are used for ejecting the product. The ejector mechanism 28 includes a push plate, an ejector plate, and a plurality of ejector pins, the push plate is connected to the rear mold plate 26 via guide posts, the ejector plate is mounted on the push plate, and the plurality of ejector pins are mounted on the ejector plate. The two ejection mechanisms 28 do not eject the product at the same time, but eject the two-color product 3 formed on the corresponding rear mold core 20 alternately, and the two-color product 3 is ejected and demolded by the corresponding ejection mechanism 28 in which the formed two-color product 3 is formed in the cavity of the rear mold core 20. The bottom plate 24 is provided with through holes corresponding to the two ejection mechanisms 28 respectively, and the driving ends of the two cylinders penetrate through the through holes to drive the two ejection mechanisms 28 respectively, so that alternate ejection actions are realized.

Specifically, the method also comprises the following processes:

A. driving the front die and the rear die to carry out die assembly so as to form a first cavity and a second cavity between the front die and the rear die; B. the floating needle is driven to ascend through the driving mechanism;

C. injecting a first color injection molding fluid into the first cavity to form a first color injection molding;

D. the floating needle is controlled by the driving mechanism to reset so as to form a glue running channel for running glue by the fluid for the second color injection in the first color injection molding part, then the front mold and the rear mold are driven to open,

E. controlling the rear die to rotate 180 degrees and then driving the front die and the rear die to carry out die assembly;

F. b, injecting a second-color injection fluid into the first cavity to form a second-color injection part, and simultaneously executing the step B in the second cavity, and then injecting the first-color injection fluid into the second cavity to form a first-color injection part; G. and opening the mold and taking out the second color injection molding.

The foregoing is merely exemplary of the present utility model, and those skilled in the art should not be considered as limiting the utility model, since modifications may be made in the specific embodiments and application scope of the utility model in light of the teachings of the present utility model.

Claims (9)

1. The utility model provides a make double-colored product paste more inseparable mould of moulding plastics, including front mould (1) and back mould (2) that cooperate each other, front mould (1) include first front mould core (10), second front mould core (11), first nozzle group (12) and second nozzle group (13), back mould (2) include two symmetrical setting and the same back mould core (20) of structure, first front mould core (10) cooperate with one of them back mould core (20) and form first die cavity, second front mould core (11) cooperate with another back mould core (20) and form the second die cavity, first nozzle group (12) are used for injecting first color injection fluid to first die cavity, second nozzle group (13) are used for injecting second color injection fluid to second die cavity; the method is characterized in that: the rear mould (2) further comprises two floating mechanisms, the two floating mechanisms are arranged in one-to-one correspondence with the two rear mould cores (20), and the floating mechanisms are used for floating when the rear mould cores (20) are used for forming the first color injection molding piece so that the first injection molding piece forms a glue running channel.

2. The mold for making two-color product injection-molding adhesion closer according to claim 1, characterized in that: the floating mechanism comprises a movable floating plate (21), a group of driving mechanisms (22) and a group of floating needles (23),

the floating plate (21) is used for installing a floating needle (23);

the number of each group of driving mechanisms (22) is four, and the four driving mechanisms (22) are respectively arranged at four corners of the floating plate (21) and are used for driving the floating plate (21) to move;

the number of each group of floating needles (23) is multiple, the upper ends of the two groups of floating needles (23) respectively penetrate through the two rear mold cores (20), and one group of floating needles (23) extend into the first cavity so that the first color injection molding piece (31) forms a glue running channel with a back-off structure.

3. The mold for making two-color product injection-molding adhesion closer according to claim 1, characterized in that: the front mould (1) comprises a front mould plate (14), a runner seat (15) and a front mould base (16) which are sequentially connected, the number of the runner seats (15) is two, the two runner seats (15) are respectively used for fixedly mounting a first nozzle group (12) and a second nozzle group (13), and the front mould base (16) is used for fixedly mounting a first front mould core (10) and a second front mould core (11).

4. The mold for making two-color product injection-molding adhesion closer according to claim 1, characterized in that: the front die (1) further comprises a front die insert (17) and a plurality of core pins (18), the front die insert (17) is arranged on the first front die core (10) and forms the first cavity with one of the rear die cores (20), the plurality of core pins (18) are arranged on the first front die core (10) and penetrate through the front die insert (17), the number of the core pins (18) is smaller than or equal to the number of a group of floating pins (23), each core pin (18) is correspondingly arranged with one floating pin (23) and has the same axis, and the core pins (18) are used for enabling the first color injection molding piece (31) to form a glue running channel capable of injecting fluid for second color injection molding.

5. A mold for making two-color product injection-molding adhesion more compact as defined in claim 3, wherein: the front die (1) further comprises two positioning rods (19), one ends of the two positioning rods (19) are mounted on the front die holder (16), the other ends of the two positioning rods (19) are inserted into the rear die (2), the two positioning rods (19) are located on one side, close to the second front die core (11), of the first front die core (10), the rear die (2) is provided with positioning holes (201) for accommodating the positioning rods (19), and the positioning rods (19) are used for clamping and positioning after the rear die (2) rotates.

6. The mold for making two-color product injection-molding paste more tightly according to claim 2, wherein: the back mould (2) is still including bottom plate (24), mould foot (25), back template (26) and back die holder (27) that connect gradually, and the quantity of mould foot (25) is three, and three mould foot (25) interval sets up and makes and forms two activity spaces between bottom plate (24) and back template (26), and back die holder (27) are used for two back mold cores of fixed mounting (20), and the bottom of back die holder (27) is provided with the space of stepping down that is used for holding floating board (21) activity, and floating board (21) are in back die holder (27) through guide swing joint.

7. The mold for making two-color product injection-molding adhesion closer according to claim 6, characterized in that: the driving mechanism (22) comprises a push rod (221), a lever (222) and a hinge piece (223), wherein the push rod (221) is movably inserted into the rear die holder (27), the lever (222) is hinged on the rear die plate (26) through the hinge piece (223), one end of the lever (222) is abutted against the bottom end of the push rod (221), and the other end of the lever (222) is abutted against the bottom of the floating plate (21).

8. The mold for making two-color product injection-molding adhesion closer according to claim 7, characterized in that: four abdicating holes (161) and four cushion blocks (162) are formed in the bottom of the front die holder (16), and the four abdicating holes (161) are arranged around the second front die core (11) and are used for accommodating the top ends of the ejector rods (221); four pads (162) are arranged around the first front mould core (10) and are used for propping against the top end of the ejector rod (221).

9. The mold for making two-color product injection-molding adhesion closer according to claim 6, characterized in that: the rear mould (2) further comprises two ejection mechanisms (28), the two ejection mechanisms (28) are respectively movably arranged in the two movable spaces, and the two ejection mechanisms (28) are used for ejecting the double-color products (3).