CN100586694C - High speed injecting molding method by counter pressure method and chemical foaming method - Google Patents
High speed injecting molding method by counter pressure method and chemical foaming method Download PDFInfo
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- CN100586694C CN100586694C CN200710026382A CN200710026382A CN100586694C CN 100586694 C CN100586694 C CN 100586694C CN 200710026382 A CN200710026382 A CN 200710026382A CN 200710026382 A CN200710026382 A CN 200710026382A CN 100586694 C CN100586694 C CN 100586694C
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Abstract
The invention involves a counter-pressure chemical foaming high speed injection moulding shaping method. The invention provides a method which utilizes injection moulding shaping machine equipment, and dies, general gas energy, plastic raw materials and other system resources comprehensively, produces thick-wall plastic-foam product high speed and high effectively. The invention first closes the die and injects gas into die cavity, then injects molten material into die cavity, the welding fluid is full of die cavity after inner foaming, the molten material surface is closed to the metal wall-surface of die cavity, the molten material in die cavity is solidified and shaped after cooled, then opens the moving mold and static mold, the plastic products are prepared which surface is smooth anddense and inner is distributed with uniform foam. The invention can eliminate or reduce the converging cave and warping deformation of product surface, reduces injection moulding pressure, thereby reduces the lock-mode pressure of injection machine; reduces equipment operating costs, thereby improves the size accuracy and strength of products, can reduces 15% ~ 35% raw material consumption effectively, products have higher mechanical property and weight proportion.
Description
Technical field
The present invention relates to a kind of method of chemical blowing injection mo(u)lding operation of foamed plastic product, relate in particular to the low pressure chemical foam injection molding method of the plastic foamed product of heavy wall of sector applications such as a kind of auto parts machinery, sports equipment, household electrical appliances and toy.
Background technology
Be subjected to the influence of factors such as oil price and material energy scarcity, global plastic raw materials price has the trend of continuous rising, and the plastic applications technology that improves usefulness that economizes in raw materials is rapidly developed.Aspect injection mo(u)lding, application technology such as foaming, gas assistant injection molding and water-aid injection molding and equipment development thereof are the important component parts of plastics industry and Processing Technology Development in recent years.The foam injection molding technology is wherein a kind of in the industry cycle rather well received technology, and the place that this technology attracts people's attention most is that it can shorten the production cycle significantly and reduce consumption of raw materials.
At present, in physical blowing method and chemical blowing process two big class foam injection molding methods, the relative CBA of physical blowing agent can obtain bigger foaming effect.What but process was set has relatively high expectations, need be than the complicated mechanical devices technology, and related in extensive range of the operation of foundation; Thereby the processing (or moulding) to product need be paid more resources.On the other hand, current some foam injection molding operations in vogue both at home and abroad have certain restriction to the application of product; As " MuCell (little foaming forming technique) " operation,, also can not make secondary and decorate processing, as silk-screen, bat printing, plating etc. because of the rough surface of product because of the factor of outward appearance should not be produced transparent product.Therefore be necessary on the basis of traditional low pressure chemical foaming operation, to invent a kind of new foam injection molding method, to solve the above-mentioned problem that exists.
Summary of the invention
Problem at existing foam injection molding technology existence, technical problem to be solved by this invention is the shortcoming that overcomes above-mentioned physics and chemical blowing process existence, system resources such as a kind of comprehensive utilization injection mo(u)lding machine equipment, mould, the argoshield energy, plastic raw materials are provided, and high-speed and high-efficiency is produced the method for the plastic foamed product of heavy wall.This injection molding forming method is called " high speed injecting molding method by counter pressure method and chemical foaming method ".By this method, utilize at a high speed (injection speed that 200mm/s is above), low pressure (1200～1500kg/cm
2Injection pressure) injection moulding mode and melt foaming plastics internal and external pressure balance principle, the product of production has inner evenly distribution abscess, and the characteristics of smooth surface densification.
For reaching above-mentioned purpose, high speed injecting molding method by counter pressure method and chemical foaming method of the present invention comprises the steps:
1., at first dynamic model moves to cover half, mould closes, and gas storage and control system injecting gas in die cavity makes to form in the sealing die cavity and keep 2～7MPa stablize air pressure, at this moment seals automatically to chew device and seal the She Zui hole;
2., by compression, the melt pressure in the barrel increases when plasticized screw moves forward for the melt that contains blowing agent that plastified in barrel then;
3., envelope is chewed device moment and opened in plasticized screw reach process, melt is by injection speed, 1200～1500kg/cm with 200～500mm/s
2Injection pressure inject die cavity;
4., this moment melt in mold filling process, begin foaming because pressure descends rapidly, the quantity of abscess increases and increases of expanding, die cavity gas begins to be discharged from, but the die cavity internal gas pressure keeps weighing apparatus to decide, die cavity air pressure is resisted the abscess bulbs of pressure;
5., be full of die cavity through inside foaming melt, die cavity gas is all discharged simultaneously, abscess continues to expand and increases, make the melt surface be close to die cavity metal wall, plasticized screw begins rotation under the drive of screw actuator, the solid plastic in the hopper enters barrel and is fed forward, under reaction force, plasticized screw retreats while rotating, till the gauge position of setting;
6., in the die cavity that makes by above-mentioned steps melt through the cooling curing moulding, automatically envelope is chewed device and is sealed the She Zui hole at this moment, open dynamic model, cover half again, obtain smooth surface to close and plastic part inner even distribution abscess, the solid product of product weight ratio effectively reduces 15%～35%, return step this moment 1., repeats next circulation.
The method that a kind of high-speed and high-efficiency that fully utilizes system resources such as injection mo(u)lding machine equipment, mould, the argoshield energy, plastics provided by the present invention is produced the plastic foamed product of heavy wall.This injection molding forming method, utilize high velocity, low pressure injection moulding mode and melt foaming plastics internal and external pressure balance principle, the product of producing has inner evenly distribution abscess, and the characteristics of smooth surface densification, the product surface that the present invention obtained can carry out secondary and decorate processing, as bat printing, silk-screen, plating etc.This foam injection molding method can improve product design flexibility, improve working (machining) efficiency and reduce cost, properties of product are reliable, yield rate is high.This method can effectively reduce by 15%～35% raw materials consumption when producing plastic part, but preserves enough intensity and weight reduction effectively simultaneously, has improved value-added content of product.
The advantage that high speed injecting molding method by counter pressure method and chemical foaming method has:
I. eliminate or reduce the contraction indenture and the buckling deformation on product surface;
II. reduce injection pressure, thereby reduce the locked mode pressure of injection machine, reduce the equipment operating cost;
III. reduce the internal stress of product, thereby improve dimensional accuracy of products and intensity;
IV. reduce the weight of product, thus conservation;
V. the product smooth surface can be carried out decoration process processing as bat printing, silk-screen, plating etc.;
VI. shorten the molding cycle of product, especially the heavy wall product;
VII. the sound insulation of product and heat insulation usefulness are better;
VIII. product has higher mechanical properties and part by weight.
Description of drawings
Fig. 1 back-pressure method of the present invention foam injection molding movement structure schematic diagram;
Fig. 2 back-pressure method of the present invention foam injection molding cyclic program step 1 schematic diagram;
Fig. 3 back-pressure method of the present invention foam injection molding cyclic program step 2 schematic diagram;
Fig. 4 back-pressure method of the present invention foam injection molding cyclic program step 3 schematic diagram;
Fig. 5 back-pressure method of the present invention foam injection molding cyclic program step 4 schematic diagram;
Fig. 6 back-pressure method of the present invention foam injection molding cyclic program step 5 schematic diagram;
Fig. 7 back-pressure method of the present invention foam injection molding cyclic program step 6 schematic diagram.
The specific embodiment
For further understanding feature of the present invention, technological means and the specific purposes that reached, function, the present invention is described in further detail below in conjunction with the accompanying drawing and the specific embodiment.
Dependency structure of the present invention mainly comprises following parts (or device): gas storage and control system 1, dynamic model 2, cover half 3, envelope chew device 4, penetrate chew 5, barrel 6, plasticized screw 7, hopper 8, barrel supporting seat 9, screw actuator 10, moving leader 11, plastic part 12.
High speed injecting molding method by counter pressure method and chemical foaming method of the present invention is to inject a certain amount of gas in the die cavity that closes to sealing, and gas is penetrated and chewed 5 holes and sealed in die cavity internal shaping and the pressure stable that keeps 2～7MPa simultaneously, avoids melt to flow into die cavity; The melt that contains CBA that has plastified in barrel 6 is under the promotion of plasticized screw 7 reach and by compression, melt pressure increases; Automatically envelope is chewed 4 and is opened in moment then, and melt is by with the injection speed more than the 200mm/s, 1200～1500kg/cm
2Injection pressure inject die cavity, melt begins foaming because pressure descends rapidly in mold filling process, the increasing and the increase of expanding of abscess; Die cavity gas begins to be discharged from, but the die cavity internal gas pressure keeps weighing apparatus fixed; The pressure that die cavity air pressure opposing abscess Peng is expanded, abscess can not burst bath surface, then the melt of inner foaming is full of die cavity, die cavity gas is all discharged, abscess continues the bloated increase of Peng, make the melt surface be close to the die cavity wall, the contraction of having avoided melt to occur in the cooling curing process, and need not injection moulding pressurize operation.The melt foaming plastics are opened mould and are obtained smooth surface to close through the cooling curing moulding, and the inner evenly plastic part 12 of distribution abscess.
The equipment aspect needs the logical injection machine of a Daepori, and this injection machine can be hydraulic drive, all-electric or electric liquid associating transmission.Adopt hydraulic drive as the adapted to injection system of injection machine, then have two on this basis equally each scheme is optional and select, to satisfy the requirement of high speed injection (injection speed that 200mm/s is above): (one), adopt accumulator apparatus; (2), increase pumping plant power.Injection molding machine adopts the plasticized screw 7 and the injection device of screw plasticizing, penetrates to chew 5 places and automatic envelope is housed chews device 4.Moving leader 11 connects barrel supporting seat 9 and screw actuator 10 on the injection molding machine, barrel supporting seat 9 is provided with hopper 8, one cover sealing property dynamic model 2, cover half 3 moulds preferably have the turnover air flue of independent control, gas to enter the steady pressure value that keeps 2～7MPa in the die cavity behind the die cavity.One cover gas storage and control system 1 (gas storage and control system device thereof) is for die cavity provides source of the gas.These gases can be that compressed air, nitrogen or carbon dioxide etc. very easily obtain general industry gas.
By a general hydraulic drive injection machine, have accumulator apparatus, to satisfy energy-conservation and demand high speed injection.Injection machine adopts the plasticized screw 7 and the injection device of screw plasticizing, penetrates to chew the automatic envelope that 5 places have automatic control and chew device 4.The requirement of mould is the frothing injection particular manufacturing craft that opens and closes flexibly, guarantees sealing property, built-in turnover air flue.By a gas storage device and a control system thereof that is applicable to general industries such as compressed air, nitrogen, carbon dioxide with gas, for die cavity provides source of the gas (referring to accompanying drawing 1).
The injection molding forming method of plastic foamed product of the present invention is called high speed injecting molding method by counter pressure method and chemical foaming method, and its detailed process goes on foot to gather and is:
1., at first dynamic model 2 moves to cover half 3, dynamic model 2, cover half 3 close tightly, mould closes, die cavity is by gas storage and control system 1 injecting gas, gas is full of die cavity, being shaped also (to make in the sealing die cavity) keeps the stable gas pressure of 2～7MPa, and at this moment envelope is chewed device 4 and sealed to penetrate and chew 5 holes automatically, in order to avoid melts enter die cavity (referring to accompanying drawing 2) in the barrel 6;
2., the melt that contains blowing agent that in barrel 6, has plastified then when plasticized screw 7 reach by compression, therefore envelope is chewed device 4 sealings the time, plasticized screw 7 reaches, the melt that contains CBA that in barrel 6, has plastified by compression, the melt pressures in the barrel 6 increase (referring to accompanying drawing 3);
3., automatically envelope is chewed device 4 moment in plasticized screw 7 quick reach processes and opened, melt is by with the injection speed more than the 200mm/s, 1200～1500kg/cm
2Injection pressure inject die cavity, melt begins foaming (referring to accompanying drawing 4) because pressure descends rapidly in mold filling process;
4., this moment, melt began foaming because pressure descends rapidly in mold filling process, the quantity of abscess increases and the increase of expanding, and die cavity gas begins to be discharged from, but the die cavity internal gas pressure keeps weighing apparatus fixed, the die cavity air pressure opposing abscess bulbs of pressure, abscess can not burst bath surface (referring to accompanying drawing 5);
5., be full of die cavity through inside foaming melt, die cavity gas is all discharged simultaneously, abscess continues to expand and increases, make the melt surface be close to die cavity metal wall, the contraction of having avoided melt to occur in the cooling curing process, and need not injection moulding pressurize operation, plasticized screw 7 begins rotation under the drive of screw actuator 10, solid plastic in the hopper 8 enters barrel 6 and is fed forward, under reaction force, plasticized screw 7 retreats while rotating, till the gauge position of setting (referring to accompanying drawing 6);
6., in the die cavity that makes by above-mentioned steps melt through the cooling curing moulding, automatically envelope was chewed device 4 and was sealed to penetrate and chew 5 holes this moment, open dynamic model 2, cover half 3 again, obtain smooth surface to close and plastic part 12 inner even distribution abscess, return step this moment 1., repeats next circulation (referring to accompanying drawing 7).
The 6. described smooth surface of step is to close and plastic part 12 inner evenly distribution abscess, and the solid product of its weight ratio is minimizing 15%～35% effectively.
And on the other hand, the melt of injection moulding has next time plastified and has been stored in barrel 6 and treats injection moulding, and a molding cycle is finished, its injection mo(u)lding cyclic program such as accompanying drawing 2 → accompanying drawing 3 → accompanying drawing 4 → accompanying drawing 5 → accompanying drawing 6 → accompanying drawing 7 → accompanying drawing 2 processes.
Above illustrated embodiment only is used for conveniently illustrating the present invention, be not that the present invention is done any pro forma restriction, have in the injection moulding applied technical field under any and know the knowledgeable usually, if in the scope that does not break away from technical characterictic that the present invention carries, utilize disclosed technology contents to make the local equivalent embodiment that changes or modify, and do not break away from technical characterictic content of the present invention, all still belong in the scope of the technology of the present invention feature.
Claims (1)
1, a kind of high speed injecting molding method by counter pressure method and chemical foaming method is characterized in that, comprises following injection mo(u)lding step:
1., at first dynamic model (2) moves to cover half (3), mould closes, and gas storage and control system (1) injecting gas in die cavity makes to form in the sealing die cavity and keep 2～7MPa stablize air pressure, at this moment seals automatically to chew device (4) and seal to penetrate and chew (5) hole;
2., by compression, the melt pressure in the barrel (6) increases when plasticized screw (7) moves forward for the melt that contains blowing agent that plastified in barrel (6) then;
3., envelope is chewed device (4) moment and opened in plasticized screw (7) reach process, melt is by injection speed, 1200～1500kg/cm with 200～500mm/s
2Injection pressure inject die cavity;
4., this moment melt in mold filling process, begin foaming because pressure descends rapidly, the quantity of abscess increases and increases of expanding, die cavity gas begins to be discharged from, but the die cavity internal gas pressure keeps weighing apparatus to decide, die cavity air pressure is resisted the abscess bulbs of pressure;
5., be full of die cavity through inside foaming melt, die cavity gas is all discharged simultaneously, abscess continues to expand and increases, make the melt surface be close to die cavity metal wall, plasticized screw (7) begins rotation under the drive of screw actuator (10), the solid plastic in the hopper (8) enters barrel (6) and is fed forward, under reaction force, plasticized screw (7) retreats while rotating, till the gauge position of setting;
6., in the die cavity that makes by above-mentioned steps melt through the cooling curing moulding, automatically envelope was chewed device (4) and was sealed to penetrate and chew (5) hole this moment, open dynamic model (2), cover half (3) again, obtain smooth surface to close and plastic part (12) inner even distribution abscess, the solid product of product weight ratio effectively reduces 15%～35%, return step this moment 1., repeats next circulation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710026382A CN100586694C (en) | 2007-01-18 | 2007-01-18 | High speed injecting molding method by counter pressure method and chemical foaming method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710026382A CN100586694C (en) | 2007-01-18 | 2007-01-18 | High speed injecting molding method by counter pressure method and chemical foaming method |
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| CN101007437A CN101007437A (en) | 2007-08-01 |
| CN100586694C true CN100586694C (en) | 2010-02-03 |
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI508837B (en) | 2010-08-26 | 2015-11-21 | 私立中原大學 | Mold gas pressure and temperature control device |
| CN102398352B (en) * | 2010-09-10 | 2013-12-18 | 私立中原大学 | Cavity gas back pressure and temperature control device |
| TWI598161B (en) * | 2016-03-04 | 2017-09-11 | 中原大學 | System for metal injection and counter pressure and method using the same |
| CN105646930B (en) * | 2016-03-04 | 2018-10-26 | 郑州大学 | Clay/thermoplastic polyurethane microporous foam nanocomposite and preparation method thereof |
| CN105751467B (en) * | 2016-03-04 | 2018-06-15 | 郑州大学 | Microporous foam thermoplastic polyurethane material and preparation method thereof |
| CN107553808A (en) * | 2017-08-16 | 2018-01-09 | 全兴工装设备（南京）有限公司 | Car inner plate low pressure chemical frothing injection mould and its forming method |
| US11780129B2 (en) * | 2020-03-20 | 2023-10-10 | King Steel Machinery Co., Ltd. | Molding method for operating molding device |
| CN111688106A (en) * | 2020-06-11 | 2020-09-22 | 上海萍青工贸有限公司 | Micro-foaming injection molding device and method |
| TW202214418A (en) * | 2020-10-14 | 2022-04-16 | 中原大學 | Injection molding apparatus and injection molding method |
| CN113334682B (en) * | 2021-04-25 | 2021-12-21 | 昆山佳禾兴电子科技有限公司 | Injection molding device for molding plastic grinding tool |
| CN113878829B (en) * | 2021-08-31 | 2023-05-12 | 东风汽车集团股份有限公司 | Moldflow-based automobile bumper injection molding process method, equipment and storage medium |
| CN113787668A (en) * | 2021-09-14 | 2021-12-14 | 深圳创维－Rgb电子有限公司 | Injection molding process, display and molding equipment |
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