CN111497126A - Injection mold for preparing automobile piston tube with metal insert and injection molding method thereof - Google Patents

Abstract

The invention provides an injection mold for preparing an automobile piston pipe with a metal insert, which comprises a rear mold frame, a rear mold core, a front mold core, a positioning mechanism and an auxiliary fixing system, wherein an inwards concave fixing groove is formed in the rear mold frame, the rear mold core is fixed in the fixing groove, the front mold core is arranged above the rear mold core and forms an injection flow channel with a space enclosed between the front mold core and the rear mold core, a pouring gate is arranged on the front mold core, the positioning mechanism for limiting and fixing the metal insert is embedded in the rear mold core, one end of the positioning mechanism extends into a rear mold cavity of the rear mold core, and the auxiliary fixing system is arranged on the side surface of the rear mold frame and is used for fixing the metal insert; the invention also provides an injection molding method, wherein the metal insert is limited and fixed through the positioning mechanism fixed on the rear mold core, then the metal insert is fixed through the auxiliary fixing system, and finally the rear mold core and the front mold core are assembled for injection molding. The invention has the characteristics of simple structure, reliable positioning and convenient operation.

Description

Injection mold for preparing automobile piston tube with metal insert and injection molding method thereof

Technical Field

The invention belongs to the technical field of injection molds, and particularly relates to an injection mold for preparing an automobile piston tube with a metal insert and an injection molding method thereof.

Background

Mold elements have the designation "industrial parent" which imparts or manufactures the corresponding appearance and structure of the part, primarily by changing the shape of the molten or liquid material. Compared with other types of molds, the injection mold is most widely applied in the manufacturing industry and is suitable for the production and the manufacture of precise and complex products. In the process of manufacturing the mould, metal inserts are inlaid in some special injection-molded parts, the strength, the durability and the like of the injection-molded parts can be improved by adopting a mode of wrapping metal materials by plastic materials, and the injection-molded parts have a wide application range.

For preparing the injection molding part with the metal insert, the existing injection mold has the defects of complex structure, troublesome positioning operation and low reliability, and an injection mold and an injection molding method for preparing the injection molding part with the metal insert, which can overcome the problems, are urgently needed.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provides an injection mold for preparing an automobile piston pipe with a metal insert and an injection molding method thereof.

The invention provides an injection mold for preparing an automobile piston pipe with a metal insert, which comprises a rear mold frame, a rear mold core, a front mold core, a positioning mechanism and an auxiliary fixing system, wherein an inwards concave fixing groove is formed in the rear mold frame, the rear mold core is fixed in the fixing groove, the front mold core is arranged above the rear mold core and forms an injection flow channel with a space enclosed by the rear mold core, a pouring gate is arranged on the front mold core, the positioning mechanism for limiting and fixing the metal insert is embedded in the rear mold core, one end of the positioning mechanism extends into a rear mold cavity of the rear mold core, and the auxiliary fixing system is arranged on the side surface of the rear mold frame and is used for fixing the metal insert positioned at one end of the positioning mechanism.

Furthermore, the positioning mechanism comprises a positioning insert, at least one positioning magnetic column for magnetically attracting and fixing the metal insert and at least one positioning insert pin for matching and fixing with a limiting hole of the metal insert, the first end face of the positioning insert embedded in the rear mold core is flush with the lower bottom face of the rear mold core, the positioning magnetic column is arranged on the second end face of the positioning insert, and the positioning insert pin extends into the first end face of the positioning insert and protrudes out of the second end face of the positioning insert.

Further, the front mold core comprises a first front mold core, a second front mold core, a first slide block system and a second slide block system, the second front mold core is fixed on the front mold base, the first front mold core is fixed through an auxiliary fixing system, the first slide block system comprises a first slide block and a first sliding device, the second slide block system comprises a second slide block and a second sliding device, the first slide block system and the second slide block system are both fixed on the rear mold base, the rear mold base is provided with a first chute and a second chute for the first slide block and the second slide block to slide respectively, the first slide block and the second slide block slide along the first chute and the second chute under the driving of the first sliding device and the second sliding device respectively, the first front mold core, the second front mold core, the first slide block and the second slide block are arranged above the rear mold core in a matching manner, and a cavity enclosed among the first front mold core, the second front mold core, the first sliding block, the second sliding block and the rear mold core forms an injection molding runner, and the second front mold core is provided with a pouring gate.

Further, first front mould benevolence includes mould benevolence body, left mouth of pipe mould benevolence and right mouth of pipe mould benevolence, this internal mounting through-hole that communicates its left and right sides face that is provided with of mould benevolence, left side mouth of pipe mould benevolence and right mouth of pipe mould benevolence all set up in this mounting through-hole and carry out the fixed positioning through fixing left positioning bolt and right positioning bolt on this mould benevolence body lateral wall respectively, the top side of mould benevolence body is seted up and is fixed the left operation through-hole and the right operation through-hole that left side mouth of pipe mould benevolence and right mouth of pipe mould benevolence correspond, set up respectively in left side mouth of pipe mould benevolence and the right mouth of pipe mould benevol.

Further, supplementary fixed system includes thimble, ejector pad, connecting rod, fixing base and cylinder, the fixing base is fixed in the die carrier side of back, the cylinder is fixed through this fixing base, the cylinder is fixed through connecting rod and this ejector pad, the ejector pad is fixed with this thimble and mould benevolence body simultaneously, the thimble runs through set up in fixing the die cavity that this internal left pipe bush benevolence of mould benevolence and right mouth of pipe mould benevolence enclose, and be used for fixing the metal mold insert of location on this positioning mechanism, the third spout has been seted up on the die carrier of back, this fixed slot and fixing base are connected to the third spout, the cylinder drives this ejector pad and carries out straight reciprocating motion along this third spout.

Furthermore, one end of the ejector pin extending into the injection molding cavity is provided with a sunken cross-shaped groove.

Furthermore, the number of the positioning magnetic columns is three, and the positioning magnetic columns are respectively a first positioning magnetic column, a second positioning magnetic column and a third positioning magnetic column.

Furthermore, the number of the positioning insert pins is two, and the two positioning insert pins are respectively a first positioning insert pin and a second positioning insert pin.

Further, first location magnetism post, second location magnetism post and third location magnetism post are a linear arrangement, first location is inlayed the needle and is set up respectively in the both sides of second location magnetism post placed in the middle with the second location, first location magnetism post, second location magnetism post and third location magnetism post and first location are inlayed needle and second location and are inlayed the needle and be the cross shape and arrange.

The invention also provides an injection molding method for manufacturing injection molded parts by applying the injection mold, which comprises the following steps:

step S1, placing a metal insert on the rear mold core fixed with the positioning mechanism, and limiting and fixing the metal insert through a positioning magnetic column and the positioning insert on the positioning mechanism;

step S2, controlling the auxiliary fixing system to drive the first front mold core to be placed at the position matched with the rear mold core;

step S3, controlling the first sliding device and the second sliding device to drive the first sliding block and the second sliding block to move to the position matched with the first front mold core along the first sliding groove and the second sliding groove respectively;

step S4, controlling a second front mold core to be placed at a position matched with the first slide block system, the second slide block system and the rear mold core;

step S5, performing injection molding through a sprue on the second front mold core;

and step S6, opening the mold.

The invention has the beneficial effects that:

the invention provides an injection mold for preparing an automobile piston pipe with a metal insert, which comprises a rear mold frame, a rear mold core, a front mold core, a positioning mechanism and an auxiliary fixing system, wherein an inwards concave fixing groove is formed in the rear mold frame, the rear mold core is fixed in the fixing groove, the front mold core is arranged above the rear mold core and forms an injection molding runner with a space enclosed by the rear mold core, a pouring gate is arranged on the front mold core, the positioning mechanism for limiting and fixing the metal insert is embedded in the rear mold core, one end of the positioning mechanism extends into a rear mold cavity of the rear mold core, and the auxiliary fixing system is arranged on the side surface of the rear mold frame and is used for fixing the metal insert positioned at one end of the positioning mechanism; the invention also provides an injection molding method, wherein the metal insert is limited and fixed through the positioning mechanism fixed on the rear mold core, then the metal insert is fixed through the auxiliary fixing system, and finally the rear mold core and the front mold core are assembled for injection molding. The invention has the characteristics of simple structure, reliable positioning and convenient operation.

Drawings

The invention is further illustrated by means of the attached drawings, but the embodiments in the drawings do not constitute any limitation to the invention, and for a person skilled in the art, other drawings can be obtained on the basis of the following drawings without inventive effort.

FIG. 1 is a schematic view of an overall structure of an injection mold according to the present invention when a front mold frame is installed.

Fig. 2 is a schematic overall structure diagram of an injection mold provided by the invention with a front mold frame removed.

Fig. 3 is a partial schematic structural view of a metal insert of an injection mold according to the present invention mounted on a positioning mechanism.

Fig. 4 is a sectional view taken along line E-E in fig. 3.

FIG. 5 is a schematic structural diagram of a positioning mechanism in an injection mold according to the present invention.

Fig. 6 is a top view of an assembly of a back mold core and a front mold core in an injection mold according to the present invention.

Fig. 7 is a sectional view taken along line a-a in fig. 6.

Fig. 8 is a schematic structural diagram of a front mold core of an injection mold according to the present invention.

Fig. 9 is a sectional view taken along line B-B in fig. 8.

FIG. 10 is a top view of an injection mold provided by the present invention.

Fig. 11 is a sectional view taken along line C-C in fig. 10.

Fig. 12 is a sectional view taken along line D-D in fig. 10.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Referring to fig. 1 to 4, the embodiment provides an injection mold for preparing an automobile piston tube with a metal insert, which includes a rear mold frame 1, a rear mold core 2, a front mold core, a positioning mechanism and an auxiliary fixing system 5, wherein the rear mold frame 1 is provided with a recessed fixing groove 11, the rear mold core 2 is fixed in the fixing groove 11, the front mold core is arranged above the rear mold core 2 and forms an injection molding runner with a space enclosed between the front mold core and the rear mold core 2, the front mold core is provided with a pouring gate, the positioning mechanism for limiting and fixing the metal insert 7 is embedded in the rear mold core 2, one end of the positioning mechanism extends into a rear mold cavity of the rear mold core 2, and the auxiliary fixing system 5 is arranged on a side surface of the rear mold frame 1 and is used for fixing the metal insert 7 positioned at one end of the positioning mechanism.

It should be noted that the first end of the positioning mechanism embedded in the rear mold core 2 is flush with the bottom surface of the rear mold core 2, the second end of the positioning mechanism is protruded out of the bottom surface of the rear die cavity of the rear die core 2 and extends into the space of the rear die cavity, because the metal insert 7 is fixed at the second end of the positioning mechanism, the metal insert 7 has a certain distance from the bottom surface of the rear mold cavity, so that an injection molding piece made of plastic material wrapping the metal material can be conveniently prepared, the auxiliary fixing system 5 limits the interior of the metal insert 7 to further provide auxiliary fixing for the metal insert 7, and the limiting fixing given by the positioning mechanism from the outer surface of the metal insert 7 is combined, so that double guarantee is provided for fixing the metal insert 7, and the positioning mechanism has the characteristics of simple structure, reliable positioning and convenience in operation.

Referring to fig. 5, in the present embodiment, the positioning mechanism includes a positioning insert 41, three positioning magnetic pillars for magnetically attracting and fixing the metal insert 7, and two positioning insert pins for cooperating and fixing with the limiting holes of the metal insert 7, where the positioning magnetic pillars are a first positioning magnetic pillar 42, a second positioning magnetic pillar 43, and a third positioning magnetic pillar 44, and the positioning insert pins are a first positioning insert pin 45 and a second positioning insert pin 46, respectively; an insert fixing step hole is formed in the rear die core 2 and comprises an insert fixing lower counter bore and an insert fixing through hole, a first end face of the positioning insert 41 is clamped in the insert fixing lower counter bore and is flush with the lower bottom face of the rear die core 2, and a second end face of the positioning insert 41 penetrates through the insert fixing through hole and extends into a space of a rear die cavity; a magnetic column fixing step hole is formed in the positioning insert 41 and comprises a magnetic column fixing lower counter bore and a magnetic column fixing through hole, the first positioning magnetic column 42, the second positioning magnetic column 43 and the third positioning magnetic column 44 are respectively and correspondingly arranged in the magnetic column fixing lower counter bore, the magnetic column fixing through hole is communicated with the magnetic column fixing lower counter bore and a first end face of the positioning insert 41, and one end face of the first positioning magnetic column 42, the second positioning magnetic column 43 and the third positioning magnetic column 44 which are arranged in the magnetic column fixing lower counter bore is flush with a second end face of the positioning insert 41; an insert pin fixing step hole is further formed in the positioning insert 41 and comprises an insert pin fixing lower counter bore and an insert pin fixing through hole, first ends of the first positioning insert pin 45 and the second positioning insert pin 46 are respectively clamped in the corresponding insert pin fixing lower counter bore, and second ends of the first positioning insert pin and the second positioning insert pin protrude out of the second end face of the positioning insert 41 through the corresponding insert pin fixing through holes.

It should be noted that the first positioning magnetic pillar 42, the second positioning magnetic pillar 43, and the third positioning magnetic pillar 44 are installed in the magnetic pillar fixing lower counter bore, flush with the second end face of the positioning insert 41 and form a face, and contact with the outer wall surface of the metal insert 7 in a face contact manner, and attract the metal insert 7 by using magnetic attraction; in addition, the first positioning insert pin 45 and the second positioning insert pin 46 respectively extend into the corresponding insert pin fixing sunken holes, when the first ends of the first positioning insert pin 45 and the second positioning insert pin 46 are clamped into the corresponding insert pin fixing sunken holes, the second ends of the first positioning insert pin 45 and the second positioning insert pin 46 protrude out of the second end surface of the positioning insert 41, are matched with the limiting through holes formed in the metal insert 7 and position the metal insert 7, and are respectively positioned by the positioning magnetic column magnetic attraction and the positioning of the positioning insert pin and the limiting through holes, so that the fixing reliability of the positioning mechanism to the metal insert 7 is improved.

Additionally, as one preferable scheme, the first positioning magnetic column 42, the second positioning magnetic column 43, and the third positioning magnetic column 44 are arranged in a straight line, the first positioning insert pin 45 and the second positioning insert pin 46 are respectively disposed on both sides of the second positioning magnetic column 43, and the first positioning magnetic column 42, the second positioning magnetic column 43, and the third positioning magnetic column 44 are arranged in a cross shape with the first positioning insert pin 45 and the second positioning insert pin 46. Under this scheme, for the circular tube type metal insert, three location magnetism posts are arranged along the circumferencial direction of circular tube type metal insert outer wall, and the location is inlayed the needle and is arranged along the central axial of circular tube type metal insert, effectively prevents the rotation of circular tube type metal insert, and is more effective to the fixed of circular tube type metal insert.

Referring to fig. 6 to 12, in this embodiment, the front mold core includes a first front mold core 31, a second front mold core 32, a first sliding block system 33 and a second sliding block system 34, the second front mold core 32 is fixed to the front mold frame 6, the first front mold core 31 is fixed by the auxiliary fixing system 5, the first sliding block system 33 includes a first sliding block 331 and a first sliding device 332, the second sliding block system 34 includes a second sliding block 341 and a second sliding device 342, the first sliding block system 33 and the second sliding block system 34 are both fixed to the rear mold frame 1, the rear mold frame 1 is provided with a first sliding groove 12 and a second sliding groove 13 for the first sliding block 331 and the second sliding block 341 to slide, the first sliding block 331 and the second sliding block 341 are respectively driven by the first sliding device 332 and the second sliding device 342 to slide along the first sliding groove 12 and the second sliding groove 13, the first front mold core 31, the second front mold core 32, the first sliding block 331 and the second sliding block 341 are cooperatively disposed above the rear mold core 341, the cavities enclosed between the first front mold core 31, the second front mold core 32, the first slide block 331, the second slide block 341 and the rear mold core 2 form an injection molding runner, and the second front mold core 32 is provided with a gate 321.

Referring to fig. 8 to 9, the first front mold core 31 includes a mold core body 311, a left nozzle mold core 312 and a right nozzle mold core 313, a mounting through hole 314 is disposed in the mold core body 311 to connect the left and right side surfaces of the mold core body, the left nozzle mold core 312 and the right nozzle mold core 313 are both disposed in the mounting through hole 314 and are fixed and positioned by a left positioning bolt and a right positioning bolt fixed on the sidewall of the mold core body 311, a left operating through hole 315 and a right operating through hole 316 corresponding to the left nozzle mold core 312 and the right nozzle mold core 313 fixed in the mounting through hole 314 are disposed on the top side of the mold core body 311, and a left oblique through groove 317 and a right oblique through groove 318 corresponding to the left operating through hole 315 and the right operating through hole 316 are disposed in the left nozzle mold core 312 and the right nozzle.

It should be noted that, the first front mold core 31, the second front mold core 32, the first sliding block system 33 and the second sliding block system 34 cooperate to form a front mold core, the lower sides of the first sliding block 331 and the second sliding block 341 are provided with a clamping seat, and are respectively in clamping fit with the first chute 12 and the second chute 13 on the rear mold frame 1, so as to prevent the first sliding block 331 and the second sliding block 341 from directly separating from the rear mold frame 1 from the upper side, and ensure that the first sliding block 331 and the second sliding block 341 can only move along the first chute 12 and the second chute 13 under the driving of the first sliding device 332 and the second sliding device 342; additionally, in order to perform injection molding on the inclined installation plane of the automobile piston tube 8, the first front mold core 31 is matched with the first sliding block 331 and the second sliding block 341 through an inclined plane; in order to better complete the injection molding of the orifice of the automobile piston tube 8, the first front mold core 31 is further provided with a left orifice mold core 312 and a right orifice mold core 313, the left orifice mold core 312 and the right orifice mold core 313 are respectively pushed into the two sides of the installation through hole 314, and are fixed and positioned by a left positioning bolt and a right positioning bolt fixed on the side wall of the mold core body 311 after reaching the set position, a cavity for injection molding of the orifice of the automobile piston tube 8 is formed between the fixed left orifice mold core 312 and the right orifice mold core 313, and the left and right operation through holes 315 and 316 of the top side of the core body 311 can directly touch the corresponding left and right slanted through grooves 317 and 318, the left and right chamfered grooves 317 and 318 are applied with force to combine and separate the left and right nozzle cores 312 and 313, thereby providing an operation window and facilitating the operation.

Referring to fig. 10 to 12, in the embodiment, the auxiliary fixing system 5 includes a thimble 51, a push block 52, a connecting rod 53, a fixing seat 54 and a cylinder 55, the fixing seat 54 is fixed to a side surface of the rear mold frame 1, the cylinder 55 is fixed by the fixing seat 54, the cylinder 55 is fixed by the connecting rod 53 and the push block 52, the push block 52 is fixed to the thimble 51 and the mold core body 311 at the same time, the thimble 51 penetrates through a cavity defined by a left nozzle mold core 312 and a right nozzle mold core 313 fixed in the mold core body 311 and is used for fixing the metal insert 7 positioned on the positioning mechanism, the rear mold frame 1 is provided with a third sliding groove 14, the third sliding groove 14 is connected to the fixing groove 11 and the fixing seat 54, and the cylinder 55 drives the push block 52 to linearly reciprocate along the third sliding groove 14.

It should be noted that the mold core body 311 is fixed on the push block 52 in advance, the left nozzle mold core 312 and the right nozzle mold core 313 are fixed in the mold core body 311, and the ejector pin 51 is fixed on the push block 52, the ejector pin 51 passes through a cavity enclosed by the left nozzle mold core 312 and the right nozzle mold core 313 and is directly communicated to the cavity of the second front mold core 32, and the push block 52 is driven by the air cylinder 55 to perform linear reciprocating motion along the third chute 14 between the fixed seat 54 and the rear mold core 2, so as to realize mold opening and mold closing motion of the first front mold core 31.

Additionally, the end of the thimble 51 that extends into the mold cavity is provided with a recessed "cross" groove 56 to facilitate injection molding of the structure of the closed end of the automotive piston tube 8.

The invention also provides an injection molding method for manufacturing injection molded parts by applying the injection mold, which comprises the following steps:

step S1, placing a metal insert 7 on the rear mold core 2 fixed with the positioning mechanism, and limiting and fixing the metal insert 7 through a positioning magnetic column and a positioning insert on the positioning mechanism;

step S2, controlling the auxiliary fixing system 5 to drive the first front mold core 31 to be placed on the position matching with the rear mold core 2;

step S3, controlling the first sliding device 332 and the second sliding device 342 to drive the first sliding block 331 and the second sliding block 341 to move along the first sliding slot 12 and the second sliding slot 13 to the position matching with the first front mold core 31;

step S4, controlling the second front mold core 32 to be placed at the position where the first sliding block system 33, the second sliding block system 34 and the rear mold core 2 are matched;

step S5, performing injection molding through the gate 321 of the second front mold core 32;

and step S6, opening the mold.

In this embodiment, during the mold closing process, the metal insert 7 is first placed on the positioning mechanism, the auxiliary fixing system 5 is then controlled, the cylinder 55 pushes the push block 52 to drive the first front mold core 31 to move along the third sliding slot 14 toward the upper side of the rear mold core 2, the thimble 51 fixed at the push block 52 penetrates through the inside of the round tube-shaped metal insert to perform the second limit fixing on the metal insert 7, the first slider 331 and the second slider 341 are then controlled to move along the first sliding slot 12 and the second sliding slot 13 to the position matching with the first front mold core 31, the first front mold core 31 is clamped and fixed from the left and right sides, the front mold base 6 is then controlled to descend, and the second front mold core 32 fixed on the front mold base 6 descends to the position matching with the first slider system 33, the second slider system 34 and the rear mold core 2, so that the first front mold core 31, the second front mold core 31, and the second mold core 2 are fixed on the front mold, A closed cavity is formed among the second front mold core 32, the first slide block 331, the second slide block 341 and the rear mold core 2, injection molding is performed through the sprue 321 on the second front mold core 32, mold opening is completed, the mold opening sequence is that the second front mold core 32 is opened first, then the rear mold core 2 is opened, the first slide block 331 and the second slide block 341 are opened simultaneously, and finally the first front mold core 31 is drawn out, so that the injection molding part is sleeved on the thimble 51, and the next cycle can be performed after the injection molding part is taken down by hands.

Compared with the prior art, the embodiment provides an injection mold for preparing an automobile piston tube with a metal insert, which comprises a rear mold frame 1, a rear mold core 2, a front mold core, a positioning mechanism and an auxiliary fixing system 5, wherein the rear mold frame 1 is provided with an inwards concave fixing groove 11, the rear mold core 2 is fixed in the fixing groove 11, the front mold core is arranged above the rear mold core 2 and forms an injection molding runner with a space enclosed by the rear mold core 2, the front mold core is provided with a pouring gate, the positioning mechanism for limiting and fixing the metal insert 7 is embedded in the rear mold core 2, one end of the positioning mechanism extends into a rear mold cavity of the rear mold core 2, and the auxiliary fixing system 5 is arranged on the side surface of the rear mold frame 1 and is used for fixing the metal insert 7 positioned at one end of the positioning mechanism; the invention also provides an injection molding method, wherein the metal insert 7 is limited and fixed through a positioning mechanism fixed on the rear mold core 2, the metal insert 7 is fixed through an auxiliary fixing system 5, and finally the rear mold core 2 and the front mold core are assembled for injection molding. The invention has the characteristics of simple structure, reliable positioning and convenient operation.

Finally, it should be emphasized that the present invention is not limited to the above-described embodiments, but only the preferred embodiments of the invention have been described above, and the present invention is not limited to the above-described embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The utility model provides a preparation has injection mold of car piston tube of metal mold insert which characterized in that, includes back die carrier, back mould benevolence, front mould benevolence, positioning mechanism and supplementary fixed system, be provided with the fixed slot of indent on the back die carrier, back mould benevolence is fixed in this fixed slot, front mould benevolence set up in the top of back mould benevolence and the back mould benevolence between enclosed space form the runner of moulding plastics, be provided with the runner on the front mould benevolence, a positioning mechanism for carrying out spacing fixed to the metal mold insert sets up in this back mould benevolence with embedding, positioning mechanism's one end stretches into in the back die cavity of this back mould benevolence, supplementary fixed system sets up in the side of back die carrier and is used for fixing the metal mold insert of location in positioning mechanism.

2. The injection mold according to claim 1, wherein the positioning mechanism comprises a positioning insert, at least one positioning magnetic post for magnetically attracting and fixing the metal insert, and at least one positioning insert pin for matching and fixing with a limiting hole of the metal insert, wherein a first end surface of the positioning insert embedded in the rear mold core is flush with a lower bottom surface of the rear mold core, the positioning magnetic post is arranged on a second end surface of the positioning insert, and the positioning insert pin extends from the first end surface of the positioning insert and has one end protruding out of the second end surface of the positioning insert.

3. An injection mold according to claim 2, wherein the front mold core comprises a first front mold core, a second front mold core, a first slide block system and a second slide block system, the second front mold core is fixed on the front mold base, the first front mold core is fixed by an auxiliary fixing system, the first slide block system comprises a first slide block and a first sliding device, the second slide block system comprises a second slide block and a second sliding device, the first slide block system and the second slide block system are both fixed on the rear mold base, the rear mold base is provided with a first sliding groove and a second sliding groove for the first slide block and the second slide block to slide respectively, the first slide block and the second slide block slide along the first sliding groove and the second sliding groove under the driving of the first sliding device and the second sliding device respectively, the first front mold core, the second front mold core, the first slide block and the second slide block are cooperatively arranged above the rear mold core, and a cavity enclosed among the first front mold core, the second front mold core, the first sliding block, the second sliding block and the rear mold core forms an injection molding runner, and the second front mold core is provided with a pouring gate.

4. An injection mold according to claim 3, wherein the first front mold core comprises a mold core body, a left nozzle mold core and a right nozzle mold core, the mold core body is provided therein with a mounting through hole for communicating the left and right side surfaces thereof, the left tube opening mold core and the right nozzle mold core are both disposed in the mounting through hole and are respectively fixed and positioned by a left positioning bolt and a right positioning bolt fixed on the side wall of the mold core body, the top side of the mold core body is provided with a left operation through hole and a right operation through hole corresponding to the left tube opening mold core and the right nozzle mold core fixed in the mounting through hole, and the left nozzle mold core and the right nozzle mold core are respectively provided therein with a left oblique through hole and a right oblique through hole corresponding to the left operation through hole and the right operation through hole.

5. An injection mold according to claim 4, wherein the auxiliary fixing system comprises an ejector pin, a push block, a connecting rod, a fixing seat and a cylinder, the fixing seat is fixed on a side surface of the rear mold frame, the cylinder is fixed by the fixing seat, the cylinder is fixed with the push block by the connecting rod, the push block is simultaneously fixed with the ejector pin and the mold core body, the ejector pin penetrates through a cavity defined by a left pipe orifice mold core and a right pipe orifice mold core fixed in the mold core body and is used for fixing a metal insert positioned on the positioning mechanism, a third chute is formed in the rear mold frame, the third chute is connected with the fixing groove and the fixing seat, and the cylinder drives the push block to linearly reciprocate along the third chute.

6. An injection mould according to claim 5, wherein the end of the spike projecting into the injection mould cavity is provided with a recessed "cross" recess.

7. The injection mold of claim 2, wherein the number of the positioning magnetic columns is three, and the positioning magnetic columns are respectively a first positioning magnetic column, a second positioning magnetic column and a third positioning magnetic column.

8. An injection mold according to claim 7, wherein the number of the positioning pins is two, and the two positioning pins are a first positioning pin and a second positioning pin.

9. The injection mold of claim 8, wherein the first positioning magnetic column, the second positioning magnetic column and the third positioning magnetic column are arranged in a straight line, the first positioning insert pin and the second positioning insert pin are respectively disposed on two sides of the second positioning magnetic column, and the first positioning magnetic column, the second positioning magnetic column and the third positioning magnetic column are arranged in a cross shape with the first positioning insert pin and the second positioning insert pin.

10. An injection molding method for producing an injection molded part by using the injection mold according to any one of claims 3 to 6, comprising the steps of:

step S1, placing a metal insert on the rear mold core fixed with the positioning mechanism, and limiting and fixing the metal insert through a positioning magnetic column and the positioning insert on the positioning mechanism;

step S2, controlling the auxiliary fixing system to drive the first front mold core to be placed at the position matched with the rear mold core;

step S3, controlling the first sliding device and the second sliding device to drive the first sliding block and the second sliding block to move to the position matched with the first front mold core along the first sliding groove and the second sliding groove respectively;

step S4, controlling a second front mold core to be placed at a position matched with the first slide block system, the second slide block system and the rear mold core;

step S5, performing injection molding through a sprue on the second front mold core;

and step S6, opening the mold.

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