CN100448643C - Chemical foaming prepressing high speed injection molding method - Google Patents
Chemical foaming prepressing high speed injection molding method Download PDFInfo
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- CN100448643C CN100448643C CNB2007100266630A CN200710026663A CN100448643C CN 100448643 C CN100448643 C CN 100448643C CN B2007100266630 A CNB2007100266630 A CN B2007100266630A CN 200710026663 A CN200710026663 A CN 200710026663A CN 100448643 C CN100448643 C CN 100448643C
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Abstract
The invention relates to a pre compression chemical foaming high speed injection mold forming. It synthetically uses the resources like injection molding equipment, molds, plastic materials and so on. It starts with the tight closing of the mold, injecting the precompressed melt material into the mold cavity, filling the cavity through inside foaming with the melt material closely attached to the metal wall of the cavity, solidification of the material after cooling, opening the male mold and the female mold to get the smooth, tight, and evenly allocated plastic parts. It can eliminate or reduce the shrink dent or warpage of the part, reducing injection pressure and the mold locking pressure, with low running cost, improved product dimension precision and strength, effectively reducing material consumption by 15%-35%, with higher mechanical feature 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 chemical foaming prepressing injection molding forming 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.And general foaming forming technique to the requirement of mould and accessory thereof than higher, the technology relative complex, in order to make foaming technique can be widely used in every profession and trade, be not subjected to outside (as mould) factor affecting, therefore be necessary on the basis of traditional low pressure chemical foaming operation, invent a kind of new foam injection molding method, to solve the above-mentioned problem that exists.
Summary of the invention
At existing foam injection molding technology to subsidiary engine accessory problem such as have relatively high expectations, technical problem to be solved by this invention is to overcome above-mentioned physics, chemical blowing process to the high shortcoming of equipment requirement, system resources such as a kind of simple and practical comprehensive utilization injection mo(u)lding machine equipment, mould, 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 " chemical foaming prepressing high speed injection molding method ".By this method, utilize at a high speed (injection speed that 300mm/s is above), precompressed (1500～2000kg/cm
2Injection pressure) the injection moulding mode and the melt foaming plastics when high speed injection and the cavity pressure equilibrium principle, the product of production has inner distributed architecture sex vesicle hole, and the characteristics of smooth surface densification.
For reaching above-mentioned purpose, precompressed chemical blowing high speed injection molding method of the present invention comprises the steps:
1., at first dynamic model moves to cover half, mould closes, and at this moment envelope is chewed device and sealed the She Zui hole automatically, utilizes oil pressure or energy storage device to increase pressure for the injection chamber;
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, the precompression of fusion melt reaches (1500～2000kg/cm
2), drive the plasticized screw reach simultaneously;
3., envelope is chewed device moment and opened then, melt is by injection speed, 1500～2000kg/cm with 300～600mm/s
2Injection pressure inject die cavity;
4., high speed injection and internal pressure discharge and make blowing agent begin foaming in melt inside, gas has little time to discharge the rapid compression of quilt and forms certain pressure in the high speed mold filling process because in the die cavity simultaneously, the blowing agent abscess bulbs of pressure in this pressure opposing melt, make blowing agent in the inner foaming of melt, abscess can not be run out of the melt surface;
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, this moment, plasticized screw began rotation under the drive of transmission device, and the solid plastic in the hopper enters barrel and is fed forward, under reaction force, plasticized screw retreats while rotating, and begins to plastify metering till the gauge position of setting;
6., melt is opened dynamic model, cover half through the cooling curing moulding in the die cavity that makes by above-mentioned steps, obtain smooth surface, repeat next the circulation to close and 1. the inner evenly plastic part of distribution abscess returns step this moment.
Further, when the 3. described automatic envelope mouth of step was closed, by the energy storage supercharging, the screw rod reach was in the shaping of barrel metering section and keep 1500～2000kg/cm
2Pressure stable;
Melt is after the cooling curing moulding in the 6. described die cavity of above-mentioned steps, and envelope is chewed device and blocked the She Zui hole automatically earlier.
The method that a kind of high-speed and high-efficiency that fully utilizes injection moulding resources commonly used such as injection mo(u)lding machine equipment, common die, plastics, CBA provided by the present invention is produced the plastic foamed product of heavy wall.This injection molding forming method, utilize high speed precompressed 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 simple and flexible, adapted to injection system by improving injection machine with common die (exhaust outlet of mould must be placed on inner surface or add portion's dispersed gas steel in die cavity) and 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 chemical foaming prepressing high speed injection molding 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 chemical foaming prepressing high speed injection molding movement structure of the present invention schematic diagram;
Fig. 2 chemical foaming prepressing high speed injection molding cyclic program of the present invention step 1 schematic diagram;
Fig. 3 chemical foaming prepressing high speed injection molding cyclic program of the present invention step 2 schematic diagram;
Fig. 4 chemical foaming prepressing high speed injection molding cyclic program of the present invention step 3 schematic diagram;
Fig. 5 chemical foaming prepressing high speed injection molding cyclic program of the present invention step 4 schematic diagram;
Fig. 6 chemical foaming prepressing high speed injection molding cyclic program of the present invention step 5 schematic diagram;
Fig. 7 chemical foaming prepressing high speed injection molding cyclic program of the present invention 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.
Relevant device structure of the present invention mainly comprises following parts (or device): dynamic model 1, cover half 2, envelope chew device 3, penetrate chew 4, blender 5, barrel 6, plasticized screw 7, hopper 8, barrel supporting seat 9, screw actuator 10, moving leader 11, plastic part 12.
Chemical foaming prepressing high speed injection molding method of the present invention, mould matched moulds are simultaneously penetrated and are chewed 4 holes and sealed, and avoid melt to flow into die cavity; The melt that contains CBA that has plastified in barrel 5 is under the promotion of plasticized screw 6 reach and by compression, the melt pressure increase reaches 1500～2000kg/cm
2Automatically envelope is chewed 3 and is opened in moment then, and melt is by with the injection speed more than the 300mm/s, 1500～2000kg/cm
2Injection pressure inject die cavity, melt begins foaming because pressure descends in mold filling process, under quick injection, abscess has little time to go to outer surface and foams in inside, and die cavity gas is compressed the low anti-blowing agent abscess bulbs of pressure of formation pressure and foams in melt inside on the other hand, and abscess can not be run out of outer surface; Then the melt of inner foaming is full of die cavity, and die cavity gas is all discharged, and abscess continuation Peng is expanded and increased, and makes 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 300mm/s is above): 1) 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 4 places and automatic envelope is housed chews device 3, infusion blender 5.Moving leader 11 connects barrel supporting seat 9 and screw actuator 10 on the injection molding machine, and barrel supporting seat 9 is provided with hopper 8, one covers common dynamic model 1, cover half 2 moulds and reaches independently exhaust outlet.
By a general hydraulic drive injection machine, have accumulator apparatus, to satisfy energy-conservation and demand high speed injection.Injection machine adopts in the plasticized screw 7, metering zone front end barrel 6 of screw plasticizing blender 5 is housed, and penetrates to chew the automatic envelope that 4 places have automatic control and chew device 3 (referring to accompanying drawing 1).
The injection molding forming method of plastic foamed product of the present invention is called preloading method chemical blowing high speed injection molding method, and its detailed process goes on foot to gather and is:
1., at first dynamic model 1 moves to cover half 2, dynamic model 1, cover half 2 close tightly, and mould closes, and at this moment envelope is chewed device 3 and sealed to penetrate and chew 4 holes automatically, in order to avoid melts enter die cavity (referring to accompanying drawing 2) in the barrel 6, melt before ejaculation barrel (6) in formation 1500～2000kg/cm
2Stable injection pressure;
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 3 sealings the time, plasticized screw 7 reaches, the melt that contains CBA that in barrel 6, has plastified by compression, the melt pressure increases in the barrel 6 reach 1500～2000kg/cm
2(referring to accompanying drawing 3);
3., automatically envelope is chewed device 3 moment in plasticized screw 7 quick reach processes and opened, melt is by with the injection speed more than the 30mm/s, 1500～2000kg/cm
2Injection pressure inject die cavity, melt begins foaming (accompanying drawing 4) because the fast pressure of speed descends in mold filling process;
4., this moment, melt began to foam because pressure descends in mold filling process, the quantity of abscess increases and the increase of expanding, die cavity gas begins to be discharged from, one side has little time to run out of the surface owing to the fast blowing agent of speed and foams in inside, the interior gas boosting resistance of die cavity blowing agent is run out of the surface and is foamed in inside on the one hand, and 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, this moment, plasticized screw 7 began 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, earlier automatically envelope is chewed device 3 and is blocked to penetrate and chew 4 holes, open dynamic model 1, cover half 2 again, obtain smooth surface to close and plastic part 12 inner even distribution abscess, the solid product of its weight ratio effectively reduces 15%～35%, return step this moment 1., repeats next circulation (referring to accompanying drawing 7).
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 (3)
1, a kind of chemical foaming prepressing high speed injection molding method is characterized in that, comprises following injection mo(u)lding step:
1., at first dynamic model (1) moves to cover half (2), mould closes, and at this moment envelope is chewed device (3) and sealed to penetrate and chew (4) hole automatically;
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 (3) moment and opened in plasticized screw (7) reach process, melt is by injection speed, 1500～2000kg/cm with 300～600mm/s
2Injection pressure inject die cavity;
4., this moment melt in mold filling process, begin foaming because pressure descends, the quantity of abscess increases and increases of expanding, die cavity gas begins to be discharged from because speed is fast, the abscess bulbs of pressure are resisted in the cavity pressure increase;
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 this moment (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, open dynamic model (1), cover half (2) 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.
2, preloading method chemical blowing high speed injection molding method according to claim 1 is characterized in that: step 1. melt forms 1500～2000kg/cm in barrel (6) before ejaculation
2Stable injection pressure.
3, preloading method chemical blowing high speed injection molding method according to claim 1 is characterized in that: melt is after the cooling curing moulding in the 6. described die cavity of step, and envelope is chewed device (3) and blocked She Zui (4) hole automatically earlier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100266630A CN100448643C (en) | 2007-02-01 | 2007-02-01 | Chemical foaming prepressing high speed injection molding method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100266630A CN100448643C (en) | 2007-02-01 | 2007-02-01 | Chemical foaming prepressing high speed injection molding method |
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| CN101011850A CN101011850A (en) | 2007-08-08 |
| CN100448643C true CN100448643C (en) | 2009-01-07 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105415566B (en) * | 2015-12-22 | 2017-07-11 | 常州信息职业技术学院 | A kind of plastic inspection well ultrasonic vibration micro foaming injection moulding devices and methods therefor |
| CN105500586B (en) * | 2016-01-20 | 2017-11-07 | 贵州省材料产业技术研究院 | A kind of chemistry injection fretting map system and foaming method |
| CN106985329B (en) * | 2017-04-26 | 2019-11-08 | 长春富维安道拓汽车饰件系统有限公司 | A kind of good appearance chemical blowing injection molding process |
| CN108000823B (en) * | 2017-12-28 | 2023-12-29 | 东华机械有限公司 | Chemical micro-foaming injection molding equipment and chemical micro-foaming injection molding process |
| 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 |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1484576A (en) * | 2000-12-27 | 2004-03-24 | ������������ʽ���� | Foam injection molding method |
| CN1488481A (en) * | 2002-09-09 | 2004-04-14 | ������������ʽ���� | Injection molded artide and injection-moulding mould and injection-moulding method |
-
2007
- 2007-02-01 CN CNB2007100266630A patent/CN100448643C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1484576A (en) * | 2000-12-27 | 2004-03-24 | ������������ʽ���� | Foam injection molding method |
| CN1488481A (en) * | 2002-09-09 | 2004-04-14 | ������������ʽ���� | Injection molded artide and injection-moulding mould and injection-moulding method |
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| CN101011850A (en) | 2007-08-08 |
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