CN103128924A

CN103128924A - Fixed die compressible die

Info

Publication number: CN103128924A
Application number: CN2013100688341A
Authority: CN
Inventors: 庄俭; 张亚军; 戚传振; 王永涛; 王新良; 周刚; 王朝华
Original assignee: NINGBO LIJIN MACHINERY CO Ltd; Beijing University of Chemical Technology
Current assignee: NINGBO LIJIN MACHINERY CO Ltd; Beijing University of Chemical Technology
Priority date: 2013-03-05
Filing date: 2013-03-05
Publication date: 2013-06-05

Abstract

The invention provides a novel fixed die compressible die. A die structure comprises a compression structure, a fixed die structure, a movable die structure and an ejection structure, and the fixed die compressible die is mainly used for forming ultrathin products, such as light guide plate products and optical discs. The fixed die compressible die is characterized in that the compression structure is designed at the side of the fixed die, an adjustable gap with 0-3mm is kept between a solid plate and a solid base plate, a counter bore is processed between the solid plate and the solid base plate for fixing a compression return spring, two plates are connected by using a hexagon socket head cap screw, the hexagon socket head cap screw has the guiding effect, the gas between two plates and the compression return spring realize the injection compression function of the die, and different gaps are controlled and reserved through an injection machine to realize injection compression moulding with different compression distances.

Description

The compressible mould of a kind of cover half

Technical field

The invention belongs to the technical field of mold in injection mo(u)lding, relate to the compressible mould of a kind of cover half, it is a kind of injection-compression mould that designs for method for injection compression molding, be applied to especially the injection compression molding of ultra-thin goods, the for example moulding of ultra-thin light guide board, the present invention are mainly in order to adapt to own injection (mo(u)lding) machine with the injection compression function now.

Background technology

Complex-shaped, the accurate in size goods of injection moulding energy one-shot forming are a kind of high efficiency, the mode of production low-costly and in high volume, have developed into the topmost processing method of macromolecular material.Along with developing rapidly of plastics industry, injection molded article is applied in various fields, particularly uses more and more extensive in the modern manufacturing industries such as automobile, electronic product.Injection compression molding is a kind of advanced form of traditional injection moulding moulding, and it can increase the ratio of the streamer length/wall thickness of injection-moulded plastic part; Adopt less clamp force and injection pressure; Reduce the material internal stress; And raising processing throughput.Injection compression molding is applicable to the product that various thermoplasticity engineering plastics are made, as: large-sized curved surface part, thin-walled, microminiaturized part, optical mirror slip, and the part that good anti-attack characteristic requirements is arranged.Especially obtain good result in the refraction of light, so some optical articles of suitable for making.

Injection compression molding is compared with the traditional injection moulding process, and the distinguishing feature of injection compression molding is: its mold cavity thickness can require automatically to adjust according to difference.For example, it can seal the mould targeting part before material does not inject die cavity to some extent, and die cavity thickness expands the twice of part completion wall thickness to.In addition, also can be according to different modes of operation, the corresponding size of controlling die cavity thickness, make it to match with injection process during the material injection or after injection is completed, and allows polymer keep suitable pressured state, and reach the effect that compensative material shrinks.

The injection compression molding technology more and more is subject to people's attention now, in order to adapt to the needs in market, a lot of injection (mo(u)lding) machines itself are with the injection compression function, therefore the design of injection-compression mould is also more and more paid attention to by people, and various injection pressure shrinking structures emerge in an endless stream and adapt to the requirement of different goods.But the unstable performance of goods of giving of preset clearance has been brought unavoidable impact.The present invention is mainly for the unsettled problem of injection compression molding process preset clearance, solves because melt impacts the gap wild effect that reason is brought when injection, is specially adapted to thin-gage goods.

Summary of the invention

Problem to be solved by this invention be mainly in the injection pressure compression process because spring changes the unsettled problem of preset clearance cause, proposed a kind of simple in structurely, and can be applied to the existing injection machine that carries the injection compression function.

The technical scheme that this patent adopts is: a kind of cover half compressible structure mould mainly comprises fixed mould structure, pressure texture, dynamic model structure, ejecting structure.Leave the adjustable clearance of 0-3mm between fixed clamping plate 2 and solid plate 1, be used for realizing the adjusting of compression distance, by counterbore, compression reseting spring 4 is housed fixedly between two plates, realize resetting of compression clearance, two plates connect by hexagon socket head cap screw, and interior hexagonal plays a part simultaneously guide effect and guarantees the maximal clearance.The cover half inserts is fixed on solid plate 1, motion together with solid plate 1, fixed mold inserts 16 is fixed on fixed clamping plate 2, remains static, during compression, fixed mold inserts 16 with 6 relative motions of cover half inserts and stretch out forward with respect to solid plate, makes core thickness reach setting value.The fixed clamping plate 2 of cover half part is also compression section with solid plate 1 simultaneously, compression section is set in the cover half side namely compression reseting spring 4 is arranged on the cover half side, the preset clearance that has caused due to the impact of melt when having avoided injection is unstable, improve the stability of injection compression molding, simultaneously owing between solid plate 1 and fixed clamping plate 2, preset clearance being arranged, avoided solid plate to contact with the direct of solid plate, can reduce cover half side heat loss, and can realize the solid plate Fast Heating.In order to match with pressure texture, sprue bush 5 is designed to the structure with U-shaped groove of extended formula, this structure matches with dynamic model inserts 7 and consists of whole running gate system, and U-shaped groove plays a part runner and slag well here.Offer air discharge duct in solid plate 1 bottom surface, improved the exhaust effect in the injection pressure compression process, can avoid the defective that causes because exhaust is bad in compression process.

Description of drawings

Fig. 1 is the mold integral structure chart;

Fig. 2 is mould schematic diagram after matched moulds finishes for the first time;

Fig. 3 is mould schematic diagram after matched moulds for the second time;

Fig. 4 sprue bush schematic three dimensional views;

Fig. 5 is that sprue bush coordinates figure with the dynamic model inserts;

Fig. 6 is solid plate bottom surface exhaust structure figure.

The specific embodiment

The present invention is the course of work that example illustrates this invention with regard to injection moulding LGP goods.This mould structure mainly contains solid plate 1 as shown in Figure 1, fixed clamping plate 2, hexagon socket head cap screw 3, compression reseting spring 4, sprue bush 5, cover half inserts 6, dynamic model inserts 7, moving platen 8, gripper shoe 9, moving clamping plate 10, push pedal 11, ejector pin retaining plate 12, thimble 13, release link 14, the compositions such as dynamic mould core inserts 15 and fixed mold inserts 16.The specific works process is, matched moulds for the first time, injector moving platen driven mold dynamic model structure moves forward, contact with solid plate 1 and promote solid plate 1 reach, until solid plate 1 and the compression distance of fixed clamping plate 2 gaps for setting, in this process, fixed mold inserts 16 can travel forward by relative solid plate, make core thickness reach setting value, sprue bush 5 also can stretch out forward along with moving after solid plate 2 and cover half inserts 6, and coordinates the whole running gate system of formation with dynamic model inserts 7.The injection machine calibrated shot, in injection process due to compressible portion design in the cover half part, during injection, melt impacts on dynamic model inserts 7, can thereby not cause the wild effect of compression distance because of impact former of melt in injection process, can guarantee that compression distance is setting value, U-shaped groove on sprue bush 5 plays a part slag well, better prevents the product defect that causes because cold burden enters die cavity.After completing, injection carries out the secondary locked mode, moving platen continues reach, until solid plate 1 contacts fully with fixed clamping plate 2, die cavity thickness reaches setting value, compression stress reaches setting value, the air discharge duct of the air discharge duct in this process on die joint and solid plate 1 bottom surface plays scavenging action, and exhaust effect is relatively good, has avoided the product defect that causes because exhaust is bad.Compress die sinking after cooling completing, solid plate 1 returns to initial maximal clearance with fixed clamping plate 2 under the effect of compression reseting spring 4, and after die sinking is completed, goods eject, and then enter next cycle.

Claims

1. A fixed mold compressible injection mold, the mold structure mainly includes a fixed mold structure, a compression structure, a movable mold structure and an ejection structure. Its main feature is that the compression structure is designed on the fixed mold side, and there is an adjustable gap of 0~3mm between the fixed mold plate and the fixed mold bottom plate, and the counterbore is processed between the fixed mold bottom plate and the fixed mold plate to fix the compressed return spring. The two plates are connected by hexagon socket bolts, and the hexagon socket bolts also play a guiding role. The injection compression function of the mold is realized by the gap between the two plates and the return spring. Different gaps are reserved by the injection molding machine to achieve different compression distances. Injection compression molding.

2. A fixed mold compressible injection mold according to claim 1, characterized in that the compression part is designed on the side of the fixed mold. There is a 3mm gap between the fixed template 1 and the fixed mold bottom plate 2, so as to achieve different compression distances. The compression return spring 4 is fixed through the counterbore between the two plates. The compression return spring can be a compressed ring spring, because the gap remains in the fixed On the mold side, springs with relatively low stiffness can be selected, which are easy to install, and the two plates are fixed and guided by hexagon socket head bolts 3.

3. A fixed mold compressible injection mold according to claims 1 and 2, characterized in that the reserved gap also plays a role of heat insulation to realize rapid heating of the fixed mold plate.

4. A fixed mold compressible injection mold according to claim 1, characterized in that the sprue bushing 5 is extendable and cooperates with the movable mold insert 7 to form the entire pouring system.

5. A fixed mold compressible injection mold according to claims 1 and 4, characterized in that there is a U-shaped groove at the front end of the main channel to cooperate with the movable mold insert as the entire runner system and serve as a cold well effect.