CN112234372B

CN112234372B - Injection molding workpiece and processing method thereof

Info

Publication number: CN112234372B
Application number: CN202011026562.5A
Authority: CN
Inventors: 吴琼; 何金凤
Original assignee: Shenzhen Clip Electronic Co ltd
Current assignee: Wuhan Clip Electronic Co ltd
Priority date: 2020-09-25
Filing date: 2020-09-25
Publication date: 2022-06-28
Anticipated expiration: 2040-09-25
Also published as: CN112234372A

Abstract

The application relates to the field of injection molding workpieces, in particular to an injection molding workpiece, a mold for the injection molding workpiece and a processing method of the mold; one of them injection molding work piece, including two at least hardware, every the outer injection moulding of hardware has first gluey core or second to glue the core, first gluey core or second glue and be provided with on the core and be used for gluing core or first limit structure who glues the core and mutually support with the second. This application makes the distance between the stitch of the work piece injection moulding back in bank keep unanimous, has the effect that promotes the off-the-shelf quality of the work piece of moulding plastics.

Description

Injection molding workpiece and processing method thereof

Technical Field

The application relates to the field of injection molding workpieces, in particular to an injection molding workpiece and a processing method thereof.

Background

In the process of injection molding, the mold used for plastic injection molding is called an injection molding mold, which is called an injection mold for short. The injection mould can form plastic products with complex appearance, high size precision or hardware in one step.

In the related art, an injection mold needs to pour out an injection molding workpiece with hardware, the hardware comprises a plurality of pins, the plurality of pins are arranged in rows, and the pins often have two rows or even multiple rows. Because each row of pins are independent from each other and the distance between each row of pins is required to be consistent, the requirement on the cavity structure of the mold is high.

In view of the above-mentioned related art, the inventor believes that there is a problem that the distance between rows of pins is often inconsistent after the injection-molded workpiece is formed, resulting in a defect in the quality of the finished product.

Disclosure of Invention

In order to keep the distance between the rows of pins consistent after the injection molding of the injection molding workpiece, and improve the quality of the finished injection molding workpiece, the application provides the injection molding workpiece and a processing method thereof.

In a first aspect, the present application provides an injection molding workpiece, which adopts the following technical scheme: an injection molding workpiece comprises at least two hardware pieces, wherein each hardware piece comprises a plurality of pins, the pins are arranged in rows, a first rubber core is formed outside one hardware piece in an injection molding mode, and two ends of each pin penetrate through the first rubber core; a second rubber core is formed on the outer layer of the other hardware in an injection molding mode, and two ends of the other hardware also protrude out of the second rubber core; the first rubber core is provided with a limiting structure which is used for being matched with the second rubber core.

By adopting the technical scheme, the first rubber core and the second rubber core can be matched with each other through the limiting structure, and the pins penetrate out of the first rubber core and the second rubber core, so that the pins can be conveniently in plug-in fit with plug-in panels such as a PCB (printed circuit board) or a bread board and the like; be provided with the limit structure who is connected with the second rubber core on the first rubber core for relative fixation between first rubber core and the second rubber core, thereby guarantee that the distance between the stitch in a row keeps unanimous, help promoting the off-the-shelf quality of the work piece of moulding plastics.

Preferably, the limiting structure comprises a clamping convex buckle and a clamping groove; the clamping convex buckle is arranged on the first rubber core, and the clamping groove is formed in the second rubber core;

the first rubber core and the second rubber core are clamped and matched with the clamping groove through the clamping convex buckle to form inner-layer glue injection.

Through adopting above-mentioned technical scheme, glue between the core through the protruding knot of joint and the mutual joint cooperation of joint recess and form the inlayer injecting glue between core first gluey core and the second, consequently first gluey core is comparatively firm with being connected between the second gluey core, is difficult for breaking away from each other.

Preferably, still include outer injecting glue, outer injection moulding is in the periphery of inlayer injecting glue.

Through adopting above-mentioned technical scheme, first gluey core and second are glued the core and can be fixed in outer injecting glue, consequently can inject the distance between the hardware in first gluey core and the second is glued the core, consequently can promote the off-the-shelf quality of the work piece of moulding plastics.

Preferably, the outer layer glue injection body is internally provided with a first matching groove and a second matching groove, the first glue core is matched with the first matching groove in an embedded mode, and the second glue core is matched with the second matching groove in an embedded mode.

Through adopting above-mentioned technical scheme, first gluey core is inlayed in first cooperation groove, and the second is glued the core and is inlayed in second cooperation groove for position between first gluey core and the second is glued the core is injectd by outer injecting glue, consequently can strengthen the first connection effect of gluing between the core and the second, makes and is difficult for the pine to take off between first gluey core and the second glue the core.

Preferably, a material stagnation structure for increasing the contact area of the outer layer glue injection is arranged on one side of the first glue core and/or the second glue core.

Through adopting above-mentioned technical scheme, outer injecting glue is when moulding plastics once more, and the area of contact between inlayer injecting glue and the outer injecting glue can be increased to the structure of delaying material, consequently outer injecting glue adheres to more firmly on the inlayer injecting glue, consequently the connection between inlayer injecting glue and the outer injecting glue is more firm.

Preferably, the other side of the first rubber core and/or the second rubber core is provided with a material retaining groove used for forming a gap between the first rubber core and the second rubber core, the outer-layer rubber injection comprises a reinforcing plate, and the reinforcing plate is arranged between the first matching groove and the second matching groove.

Through adopting above-mentioned technical scheme, leave the silo setting and glue between the core at first gluey core and second, when moulding plastics once more, during outer injecting glue can flow into and leave the silo to the firm in connection degree of core opposite side has been glued with the second to first gluey core of having strengthened.

Preferably, the reinforcing plate is heat-conducting silica gel.

By adopting the technical scheme, the heat-conducting silica gel not only can play a role in bonding the first rubber core and the second rubber core, but also can play a role in serving as a filler for outer-layer glue injection; because heat conduction silica gel has good heat conduction effect and insulating effect, consequently as the raw materials of reinforcing plate, can make the connection between the first gluey second gluey core more firm, can in time reduce the temperature of inlayer injecting glue simultaneously, can also keep the insulating nature between first gluey core and the second gluey core simultaneously.

Preferably, the rows of the stitches are connected through connecting ribs.

Through adopting above-mentioned technical scheme, the setting of even muscle can be so that in every row of stitch, the distance between every adjacent stitch is injectd, consequently can make injection moulding's in-process, and the position between the stitch is injectd, has guaranteed the stability of distance between the stitch.

Preferably, a through groove for conveniently cutting off the connecting rib between the adjacent stitches is formed in the first rubber core and the second rubber core.

Through adopting above-mentioned technical scheme, lead to the groove and expose even muscle outside gluing the core, be convenient for even cutting off of muscle, the degree of difficulty when reducing to cut off even muscle.

In a second aspect, the present application provides an injection molding method for molding an injection molded workpiece, which adopts the following technical solution.

An injection molding method for molding an injection molded workpiece, applied to the injection molded workpiece as described above, comprises the following steps: s1, injection molding, namely performing injection molding on the two hardware parts to obtain a first rubber core and a second rubber core;

s2, assembling, namely mutually matching the first rubber core and the second rubber core to form inner-layer rubber injection;

and S3, performing injection molding again, namely performing injection molding again on the inner-layer injection molding, and molding to obtain the outer-layer injection molding.

Through adopting above-mentioned technical scheme, during the shaping work piece of moulding plastics, carry out the injecting glue with the hardware earlier and form first gluey core or the second glues the core respectively, then glue the core with first gluey core and second and mutually support, form the inlayer injecting glue to mould plastics once more, consequently the fashioned work piece of moulding plastics can guarantee that the interval between every hardware equals, is difficult for taking place the skew between the hardware, walking bad phenomena such as position, has promoted the shaping quality of the work piece of moulding plastics.

Drawings

FIG. 1 is a schematic structural view of a related art hardware prior to cutting a tie bar;

FIG. 2 is a schematic view of a hardware of the related art in cutting off a connecting rib and removing a process edge;

FIG. 3 is a schematic diagram of an exploded structure of a first rubber core and a second rubber core according to an embodiment of the present application (see the clamping groove of the second rubber core);

FIG. 4 is a schematic diagram of an exploded structure of a first rubber core and a second rubber core according to an embodiment of the present application (the snap-fit buckle of the first rubber core can be seen);

FIG. 5 is a schematic view of the overall structure of an injection molded article according to an embodiment of the present application;

FIG. 6 is a bottom view of an injection molded workpiece according to an embodiment of the present application;

FIG. 7 is a cross-sectional view of the present application taken along line A-A of FIG. 6;

FIG. 8 is a front view of an injection molded article according to an embodiment of the present application;

FIG. 9 is a cross-sectional view of the present application taken along line C-C of FIG. 8;

FIG. 10 is a cross-sectional view of the present application taken along line D-D of FIG. 8;

FIG. 11 is a cross-sectional view taken along line B-B of FIG. 6;

FIG. 12 is a schematic view of an overall structure of an outer layer glue injection according to an embodiment of the present application;

FIG. 13 is a schematic diagram illustrating an overall configuration of an injection mold for forming an injection molded workpiece according to an embodiment of the present application;

FIG. 14 is a schematic view of a movable die face plate with a punch according to an embodiment of the present application;

FIG. 15 is a cross-sectional view of an injection mold for forming an injection molded workpiece according to an embodiment of the present application;

FIG. 16 is a schematic view of an assembled relationship between a movable mold and a stationary mold according to an embodiment of the present application;

fig. 17 is a partially enlarged view taken along a portion a in fig. 16;

fig. 18 is a partially enlarged view taken along B in fig. 16;

FIG. 19 is a process flow diagram of an injection molding method for forming an injection molded workpiece according to an embodiment of the present application.

Description of reference numerals: 1. hardware; 11. a stitch; 12. connecting the ribs; 13. a process edge; 131. a circular hole;

2. injecting glue into the inner layer; 21. a first rubber core; 211. clamping the convex buckle; 22. a second rubber core; 221. clamping the groove; 231. a material stagnation groove;

232. Material stagnation; 233. reserving a material groove; 24. a through groove;

3. injecting glue on the outer layer; 301. a first mating groove; 302. a second mating groove; 303. heat dissipation holes; 304. a diversion trench; 305. a material removing groove; 31. a reinforcing plate; 32. stabilizing the column; 33. a support plate; 34. a support plate;

41. a movable mould panel; 411. a punch; 42. moving the template;

51. fixing a template; 511. and (6) punching a groove.

61. A core; 611. forming a groove; 62. a cavity; 621. and forming the convex button.

Detailed Description

The present application is described in further detail below with reference to figures 1-19.

Referring to fig. 1 and 2, a hardware 1 in the related art includes pins 11 arranged in a row, adjacent pins 11 are connected by connecting ribs 12, a technical edge 13 is further adhered to the tail end of the pins 11 arranged in a row, and a circular hole 131 is formed in the technical edge 13. The hardware 1 needs to be placed in a mold and subjected to an injection molding and encapsulation process in order to form the first glue core 21 or the second glue core 22. After the first rubber core 21 or the second rubber core 22 is formed, the connecting ribs 12 need to be cut off to prevent short circuit phenomenon between the pins 11 during electric connection; while the process edge 13 also needs to be removed.

The embodiment of the application discloses a workpiece of moulding plastics.

Referring to fig. 3 and 4, the injection molding workpiece comprises at least two hardware 1, a first rubber core 21 or a second rubber core 22 is formed outside each hardware 1 in an injection molding mode, two ends of a pin 11 of each hardware 1 protrude outside, and a limiting structure used for being matched with the second rubber core 22 is arranged on the first rubber core 21.

The molding and first rubber core 21 and the second rubber core 22 may be made of PPS, PA6/PA66, LCP, TPE, PC, PP, PPA, PEEK, or the like, or may be made of ceramic.

The limiting structure comprises a clamping convex buckle 211 and a clamping groove 221; the clamping convex buckle 211 is arranged on the first rubber core 21, and the clamping groove 221 is arranged on the second rubber core 22. Of course, the first rubber core 21 may be provided with a clamping groove 221, and the second rubber core 22 may be provided with a clamping convex buckle 211. The convex clamping buckle 211 and the clamping groove 221 are clamped and matched, so that the first rubber core 21 and the second rubber core 22 are connected with each other to form the inner-layer glue injection 2. Furthermore, the limiting structure is provided with 4 pairs and distributed on one side of the rubber core in a matrix shape.

With continued reference to fig. 3 and 4, the first rubber core 21 and the second rubber core 22 are provided with a through groove 24 for conveniently cutting off the connecting rib 12 between the adjacent stitches 11. The through groove 24 is beneficial to exposing the connecting rib 12, and is convenient for cutting off the connecting rib 12 after injection molding.

Furthermore, the first rubber core 21 and the second rubber core 22 are connected between the clamping convex buckle 211 and the clamping groove 221 through an adhesive. By such arrangement, the connection between the first rubber core 21 and the second rubber core 22 is firmer, and the position deviation is not easy to occur.

Referring to fig. 5 and 6, the injection molding workpiece further comprises an outer layer injection glue 3, and the outer layer injection glue 3 can be formed on the periphery of the inner layer injection glue 2 through injection molding or can be directly formed and then sleeved on the periphery of the inner layer injection glue 2. In this embodiment, set up the holding tank in outer injecting glue 3, inlayer injecting glue 2 is located the holding tank.

With reference to fig. 7, further, in order to enhance the fixing effect of the first glue core 21, the second glue core 22 and the outer glue injection 3, so that the position between the first glue core 21 and the second glue core 22 is not easy to shift relative to the outer glue injection 3, a reinforcing plate 31 is further disposed inside the accommodating groove. The reinforcing plate 31 divides the accommodating groove into a first fitting groove 301 and a second fitting groove 302, and the first rubber core 21 is fitted in the first fitting groove 301, and the second rubber core 22 is fitted in the second fitting groove 302.

Referring to fig. 8 and 9, the reinforcing plate 31 may be integrally formed with the outer layer-injected rubber 3 during injection molding of the outer layer-injected rubber 3, or the reinforcing plate 31 may be first molded between the first rubber core 21 and the second rubber core 22. Reinforcing plate 31 can heat conduction silica gel, and heat conduction silica gel has good bonding leakproofness, can solidify under the greenhouse simultaneously, consequently when first gluey core 21 and the second matched with, can glue core 22's one side towards the second with first gluey core 21 coating of heat conduction silica gel earlier, again with first gluey core 21 and the cooperation of gluing core 22 joint of second. Of course, the aforementioned heat conductive silica gel may also be coated on one side of the second glue core 22 facing the first glue core 21, and then the second glue core 22 is snap-fitted with the first glue core 21. So set up, heat conduction silica gel can play the effect that first gluey core 21 and second glued core 22 bond for first gluey core 21 is inseparabler with being connected of second glued core 22, is difficult for producing the skew in the position when the outer injecting glue of shaping 3 between first core and the second glued core 22.

Simultaneously, the in-process of the work piece of moulding plastics after the shaping is at the transmission data generates heat easily, the higher heat in stitch 11 department can transmit to the lower reinforcing plate 31 of temperature through first gluey core 21 or second gluey core 22, heat conduction silica gel's heat conductivity is better, consequently heat conduction silica gel can be with in first gluey core 21 and the second gluey core 22 heat conduction to the air or in the outer injecting glue 3, make the heat of the work piece of moulding plastics can distribute, thereby the temperature of stitch 11 has been reduced, the transmission rate of data has been improved.

Referring to fig. 3 and 4, further, at least one side of the first rubber core 21 or the second rubber core 22 is provided with a material stagnation structure for increasing the contact area of the outer layer rubber injection 3, and the material stagnation structure may be disposed on an opposite side of the two connected first rubber cores 21 or second rubber cores 22, or on a side of the two connected first rubber cores 21 or second rubber cores 22 deviating from each other. In this embodiment, the material stagnation structure is disposed on a side of the first rubber core 21 or the second rubber core 22 away from the limiting structure. Specifically, the material stagnation structure may be a convex material stagnation rib 232 or a concave material stagnation groove 231. The setting of the structure of holding a slow down can increase the area of contact of inlayer injecting glue 2 and outer injecting glue 3, consequently helps increasing the area of adhesion between inlayer injecting glue 2 and the outer injecting glue 3 to the firm in connection degree between inlayer injecting glue 2 and the outer injecting glue 3 has been improved.

Furthermore, a material reserving groove 233 is formed in at least one side of the first rubber core 21 or the second rubber core 22, and the material reserving groove 233 is formed in two opposite sides of the first rubber core 21 and the second rubber core 22. The material retaining groove 233 forms a cavity between the first glue core 21 and the second glue core 22, so that the outer glue core 3 can flow into the space between the first glue core 21 and the second glue core 22 during injection molding, and after the outer glue core 3 is molded, the positions of the first glue core 21 and the second glue core 22 are fixed by the outer glue core 3, so that the first glue core 21 and the second glue core 22 are not easy to shift in position.

Referring to fig. 9 and 10, further, a plurality of heat dissipation holes 303 have been seted up on outer injecting glue 3, and heat dissipation hole 303 communicates holding tank and the outside of outer injecting glue 3 to partial inlayer injecting glue 2 exposes in the air through heat dissipation hole 303, makes the heat of inlayer injecting glue 2 in time transmit to the air, helps reducing the temperature of stitch 11, promotes the transmission rate of data.

Furthermore, the outer layer glue injection 3 is further provided with a flow guide groove 304, and the flow guide groove 304 is communicated with the heat dissipation holes 303. The width of the guiding groove 304 is larger than that of the heat dissipation hole 303, and the groove bottom of the guiding groove 304 and the side wall of the guiding groove 304 are in smooth transition. The guiding gutter 304 is because the heat of inlayer injecting glue 2 escapes from louvre 303 for the air in louvre 303 is heated, and consequently the air density of louvre 303 department is less than the air density of guiding gutter 304 department, and consequently the air in the guiding gutter 304 can flow to in the louvre 303 that density is less, and the hot-air of louvre 303 can only flow to louvre 303 top, helps the flow of air, has promoted the inside thermal escape of injection molding.

When the injection molding workpiece is used, the pins 11 need to be plugged with a PCB. In order to facilitate the injection molding of the workpiece, the injection molding workpiece is more firmly inserted into the PCB, the two opposite sides of the outer layer glue injection 3 are integrally formed with the stabilizing columns 32, the stabilizing columns are stabilized to be parallel to the protruding pins 11, and the protruding lengths of the stabilizing columns 32 from the outer layer glue injection 3 are longer than the lengths of the pins 11 exposed out of the outer layer glue injection 3. With the arrangement, before the pins 11 are inserted into the PCB, the stabilizing posts 32 are inserted into the PCB in advance, and under the positioning of the stabilizing posts 32, the pins 11 are not easy to be inserted in wrong positions in the process of inserting the PCB, or the pins are not easy to be displaced when in inserting.

Referring to fig. 11 and 12, further, in order to prevent the injection molding workpiece from shaking or loosening during the process of inserting the PCB, the outer-layer glue injection 3 is integrally formed with a support plate 33, and the support plates 33 are arranged on two sides of the outer-layer glue injection 3 in pairs. The setting up of backup pad 33 has increased the area of contact between outer injecting glue 3 and the PCB board for outer injecting glue 3 can place stably on the PCB board, consequently moulds plastics the difficult relative movement that produces with the PCB board of work piece.

Furthermore, as the injection molding workpiece needs to connect the PCBs, firstly, the pin 11 at one end of the injection molding workpiece is inserted into one PCB, and then the pin 11 at the other end of the injection molding workpiece is inserted into the other PCB for matching. When the stitch 11 at the other end of the injection molding workpiece is in plug-in fit with another PCB, in order to enable the connection between the other PCB and the injection molding workpiece to be more stable, the limiting structure which is integrally formed on the outer layer glue injection 3 of the injection molding workpiece can be a stabilizing column 32 or a bearing plate 34. In this embodiment, the limiting structure is a supporting plate 34, and the supporting plate 34 and the pins 11 at the other end are arranged in parallel. The PCB board can be under the spacing of bearing board 34, bearing, be difficult for carrying out the skew of position with the work piece of moulding plastics.

In addition, the material removing groove 305 is further formed in the outer-layer glue injection 3, in the embodiment, the material removing groove 305 is formed in two opposite sides of the outer-layer glue injection 3 in the embodiment, the material of the outer-layer glue injection 3 of the injection molding workpiece can be reduced, meanwhile, the influence on the strength of the outer-layer glue injection 3 is not easily caused, and the cost-saving effect is achieved.

The implementation principle of the injection molding workpiece is as follows: when a plurality of rows of hardware 1 which are not in contact with each other are embedded in one injection molding workpiece, each hardware 1 is separately injection molded to form a first rubber core 21 or a second rubber core 22; the first rubber core 21 and the second rubber core 22 are connected together through a limiting structure on the first rubber core 21 or the second rubber core 22 to form an inner-layer rubber injection 2; and then the inner-layer glue injection 2 is injected again, and an outer-layer glue injection 3 is formed on the outer layer of the inner-layer glue injection 2. So set up, the position between the hardware 1 has obtained better injecing to the difficult emergence of distance between the hardware 1 in the work piece of moulding plastics changes, consequently arranges and the difficult emergence of the distance of stitch 11 between the row changes, has promoted the quality after the work piece shaping of moulding plastics.

The embodiment of the application also discloses an injection mold for molding the injection molding workpiece.

Referring to fig. 13 and 14, an injection mold for molding an injection workpiece is applied to an injection workpiece in the above embodiments, the injection mold is a vertical mold and includes a movable mold and a fixed mold, wherein the fixed mold is disposed below the movable mold. The movable die includes a movable die plate 41 and a movable die plate 42, and referring to fig. 15, a punch 411 is attached to the movable die plate 41, and the punch 411 cuts the connecting rib 12. The movable die plate 42 is provided with a core 61, and the punch 411 is inserted through the core 61 of the movable die plate 42. A spring is installed between the movable die plate 42 and the movable die panel 41, and both ends of the spring are respectively fixed to the movable die plate 42 and the movable die panel 41 by clamping, bonding, welding or the like.

Referring to fig. 16, a cavity 62 is formed in the fixed die, and the core 61 and the cavity 62 are correspondingly molded to form a cavity, wherein the cavity comprises a first cavity and a second cavity; the first glue core 21 is molded in the first cavity and the second glue core 22 is molded in the second cavity. With reference to fig. 17 and 18, the first cavity or the second cavity is provided with a molding structure for molding the limiting structure, specifically, the molding structure includes a molding groove 611 and a molding protrusion 621, the molding groove 611 is disposed in the first cavity, and the molding protrusion 621 is disposed in the second cavity.

The implementation principle of the mold for automatically cutting off the insert during injection molding is as follows: when the movable die moves towards the fixed die, the punch 411 can be in sliding fit with the fixed die plate 51, and when the movable die and the fixed die are pressed against each other, the movable die panel 41 can move towards the movable die plate 42 for a certain distance under the supporting action of the spring, so that the punch 411 is pressed into the cavity 62 of the fixed die plate 51; because be provided with two kinds of cavitys on one set of mould, consequently can one shot forming go out the first gluey core 21 and the second gluey core 22 that can mutually support, help the first gluey core 21 and the second glue the assembly between the core 22, the distance between a plurality of hardware 1 can be convenient for inject to the mode of the first gluey core 21 of single hardware 1 shaping or the second gluey core 22 simultaneously.

The embodiment of the application also discloses an injection molding method for molding the injection molding workpiece.

Referring to fig. 19, an injection molding method for molding an injection molded workpiece, applied to an injection molded workpiece in the above-described embodiment, or applied to an injection molded workpiece in the above-described embodiment, includes the steps of: s1, injection molding, namely placing the two hardware 1 in a molding groove, and injection molding the two hardware 1 to obtain a first rubber core 21 and a second rubber core 22.

Specifically, S1 includes the steps of: and S11, placing the hardware 1 on the cavity 62 of the fixed die plate 51.

And S12, closing the die, moving the movable die to the direction of the fixed die, and pressing the hardware 1 by the movable die plate 42 so that the hardware 1 is clamped by the movable die plate 42 and the fixed die plate 51.

And S13, injecting glue, injecting the molten glue into the cavity, and forming in the cavity. Specifically, the first cavity forms a first core 21, and the second cavity forms a second core 22.

And S14, cutting ribs, wherein the punch 411 penetrates through the fixed die plate 51, the punch 411 moves towards the die closing direction, the tail end of the punch 411 cuts off the connecting ribs 12 of the hardware 1, and then the punch 411 is pressed down to be matched with the fixed die plate 51 in an inserting mode.

S15, tapping, the punch 411 moves to the mold opening direction, the punch 411 leaves the punch slot 511 and separates from the fixed die plate 51.

And S16, opening the mold, moving the movable mold away from the fixed mold, separating the molded first rubber core 21 or second rubber core 22 from the fixed mold under the action of the demolding mechanism, and taking the first rubber core 21 or second rubber core 22 out of the mold by using a suction nozzle, a manipulator or other devices.

S2, assembling, namely mutually matching the first rubber core 21 and the second rubber core 22 to form an inner-layer rubber injection 2; the first glue core 21 and the second glue core 22 can be assembled manually.

And S3, performing injection molding again, performing injection molding on the inner-layer injection molding 2 again, and molding to obtain an outer-layer injection molding 3.

The implementation principle of the injection molding method for molding the injection molding workpiece is as follows: the connecting ribs 12 are cut off after the hardware 1 is matched, and the hardware 1 is compressed before rib cutting, so that the hardware 1 is not easy to shift in the process of cutting the connecting ribs 12; after the connecting rib 12 is cut off, the punch 411 is separated from the first rubber core 21 or the second rubber core 22, so that the demolding of the first rubber core 21 or the second rubber core 22 is facilitated, and the material blocking of the first rubber core 21 or the second rubber core 22 is reduced.

The above are preferred embodiments of the present application, and the scope of protection of the present application is not limited thereto, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. An injection molding method for molding an injection molding workpiece comprises the steps that an injection mold is used for injection molding to form the injection molding workpiece, the injection molding workpiece comprises at least two hardware (1), a rubber core is formed outside each hardware (1) in an injection molding mode, a limiting structure used for being matched with another rubber core is arranged on each rubber core, each rubber core comprises a first rubber core (21) and a second rubber core (22), the injection mold comprises a movable mold and a fixed mold, the movable mold comprises a movable mold panel (41) and a movable mold plate (42), a mold core (61) is arranged on each movable mold plate (42), a mold cavity (62) is arranged on each fixed mold, the mold core (61) and the mold cavity (62) correspond to each other to form a cavity in a mold combination mode, and the cavity comprises a first cavity and a second cavity; the first cavity is used for forming a first rubber core (21), and the second cavity is used for forming a second rubber core (22); the first cavity and/or the second cavity are/is provided with a forming structure for forming a limiting structure; the movable die panel (41) is provided with a punch (411) for cutting off the connecting rib (12), the punch (411) penetrates through a core (61) of the movable die plate (42), and the punch (411) is in sliding fit with the fixed die plate (51); a spring is arranged between the movable die plate (42) and the movable die panel (41), and two ends of the spring are respectively fixed on the movable die plate (42) and the movable die panel (41); when the movable die moves towards the fixed die plate (51), the punch (411) is in sliding fit with the fixed die plate (51), and when the movable die and the fixed die plate (51) are pressed against each other, the movable die panel (41) can also move towards the movable die plate (42) for a distance under the supporting action of a spring, so that the punch (411) is pressed down into the cavity (62) of the fixed die plate (51);

The injection molding method sequentially comprises the following steps:

s1, injection molding, namely performing injection molding on the two hardware pieces (1) to obtain a first rubber core (21) and a second rubber core (22) which are respectively formed; the hardware (1) comprises stitches (11) arranged in rows, adjacent stitches (11) are connected through connecting ribs (12), and the tail ends of the stitches (11) arranged in rows are adhered with technical edges (13); the first rubber core (21) and the second rubber core (22) are provided with through grooves (24) for conveniently cutting off connecting ribs (12) between adjacent stitches (11); the through grooves (24) are arranged to facilitate the exposure of the connecting ribs (12) and facilitate the cutting off of the connecting ribs (12) after injection molding;

s2, assembling, namely mutually matching the first rubber core (21) and the second rubber core (22) to form an inner-layer rubber injection (2);

s3, performing injection molding again on the inner-layer injection molding (2), and forming to obtain an outer-layer injection molding (3);

the step S1 sequentially includes the following steps:

s11, placing the hardware (1) on the cavity (62) of the fixed die plate (51);

s12, clamping the mold, wherein the movable mold moves towards the fixed mold direction, and the movable mold plate (42) presses the hardware (1), so that the hardware (1) is clamped by the movable mold plate (42) and the fixed mold plate (51);

S13, injecting glue, injecting the molten glue into the cavity, and forming in the cavity, wherein the first cavity forms the first glue core (21), and the second cavity forms the second glue core (22);

s14, cutting ribs, wherein the punch (411) moves towards a mold closing direction, and the tail end of the punch (411) cuts off the connecting ribs (12) of the hardware (1); in the rib cutting step of S14, the punch (411) penetrates through the fixed die plate (51), the punch (411) moves towards the die closing direction, the tail end of the punch (411) cuts off the connecting rib (12) of the hardware (1), and then the punch (411) is pressed down to be in inserted fit with the fixed die plate (51);

s15, tapping, wherein the punch (411) moves towards the die opening direction, and the punch (411) leaves the punching groove (511) and is separated from the fixed die plate (51);

and S16, opening the mold, moving the movable mold away from the fixed mold, separating the molded first rubber core (21) or second rubber core (22) from the fixed mold under the action of a demolding mechanism, and taking the first rubber core (21) or second rubber core (22) out of the mold.

2. An injection molding method according to claim 1, characterized in that: the limiting structure comprises a clamping convex buckle (211) and a clamping groove (221); the clamping convex buckle (211) is arranged on the first rubber core (21), and the clamping groove (221) is formed in the second rubber core (22); the clamping convex buckle (211) is used for clamping the clamping groove (221) to form the inner-layer glue injection (2) in a clamping matching mode.

3. An injection molding method according to claim 2, characterized in that: the outer layer glue injection (3) is formed on the periphery of the inner layer glue injection (2).

4. An injection molding method according to claim 1, characterized in that: and a material stagnation structure used for increasing the contact area of the outer layer glue injection (3) is arranged on one side of the first glue core (21) and/or the second glue core (22).

5. An injection molding method according to claim 1, characterized in that: and a material retaining groove (233) used for allowing the outer-layer glue injection (3) to flow into the space between the first glue core (21) and the second glue core (22) is formed in the other side of the first glue core (21) and/or the second glue core (22).

6. An injection molded workpiece, characterized in that: based on an injection molding method for molding an injection molded workpiece as claimed in claim 1.