CN104552767B - The system of fluid-assisted injection shaping - Google Patents
The system of fluid-assisted injection shaping Download PDFInfo
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- CN104552767B CN104552767B CN201510049933.4A CN201510049933A CN104552767B CN 104552767 B CN104552767 B CN 104552767B CN 201510049933 A CN201510049933 A CN 201510049933A CN 104552767 B CN104552767 B CN 104552767B
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- injection
- cavity
- water
- die cavity
- control device
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/1703—Introducing an auxiliary fluid into the mould
- B29C45/1704—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles
- B29C45/1706—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles using particular fluids or fluid generating substances
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/1703—Introducing an auxiliary fluid into the mould
- B29C45/1704—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles
- B29C45/1706—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles using particular fluids or fluid generating substances
- B29C2045/1707—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles using particular fluids or fluid generating substances using a liquid, e.g. water
Abstract
The present invention is a kind of system of fluid-assisted injection shaping, is related to polymer material molding device, formation system device used in specifically a kind of fluid-assisted Injection Molding forming method.The present invention is mainly by injection moulding machine（100）, current injection control device（200）, gases at high pressure injection control device（300）, injection forming mold（400）, water needle device（3）Formed with connecting pipe；Wherein, the injection forming mold（400）Installed in injection moulding machine（100）On, injection forming mold（400）There is shaping hollow product after closure（6）Die cavity（2）, material overflow cavity（5）, connection die cavity（2）And material overflow cavity（5）Interface channel（4）, and from die cavity（2）To material overflow cavity（5）Interface channel（4）On be sequentially arranged switch valve（4a）And current limiting element（4b）；Advantages of the present invention, the product inner wall smooth produced using present system, it is much better than the inwalls of the auxiliary technique institute moulded products of light water, does not find thin-walled position filling existing during the auxiliary injection molding of general water not exclusively and the defects of shrinkage cavity/shrinkage porosite/layering.
Description
Technical field
The present invention relates to polymer material molding device, specifically a kind of fluid-assisted Injection Molding forming method is used
Formation system.
Technical background
Fluid（Water）Assisted Injection Molding Technology, it is a kind of control fluid（Water）, it is injected into the specific melting zone of product
Domain is to form hollow technology.Acted on after injection molten thermoplastic melt using liquid drugs injection to its core injection water, the forward position of water
On the molten core of product, from the forward position of water to the changeover portion of melt, one layer of very thin plastic foil is have cured, promotes polymer to melt
Body, mold cavity is filled to obtain hollow product.Fluid（Water）Assisted Injection Molding Technology and gas assisted Injection Molding Technology
Compare, water aided injection forming have cool time and molding cycle are shorter, product inner surface is more smooth, thickness evenly, it is raw
Produce the advantages such as cost reduction, production efficiency increase.But also it is very easy in the resin section of the hollow product of water shaping
Incomplete defect is filled in die cavity in discovery shrinkage cavity or shrinkage defect, and product.This is mainly due to gas-assisted molding
Medium used（Generally high pressure nitrogen）With the medium used in water aided injection forming（Water）The difference of physical characteristic cause；
Such as in gas assistant injection molding, space-time is hollow because the thermal capacity of nitrogen is low in high pressure nitrogen promotes melten gel to be formed
Inwall will not solidify immediately, but from the product outer wall contacted with mold cavity wall to hollow wall cool down, simultaneously because nitrogen
Gas has compressibility, i.e. nitrogen has the bulbs of pressure to promote melten gel to move complementary contraction to cavity wall to mould and be sufficient filling with type
Chamber, shrinkage porosite can also be eliminated using high pressure nitrogen pressurize operation after hollow molding is completed and the endless congruence of cavity filling lacks
Fall into；And when using water shaping, because the thermal conductivity of water is 40 times of nitrogen, the thermal capacity of water is 4 times of nitrogen, ducted body
Inwall can quickly form hard cured layer, the outer wall at the same time contacted with mold cavity wall is also fast under the cooling of mould
Speed forms hard cured layer, but water has Incoercibility, it is meant that in stowing operation is flowed if without enough resistances
Power cannot form enough hydraulic pressure to act on resinite, solidification after so resulting between two layers of hard cured layer
Part produces the defects of shrinkage cavity or shrinkage porosite, and can not promote and not solidify the thin-wall construction that melten gel is fully populated with die cavity.For system
Product fill incomplete defect in die cavity, by the way of screw rod pressurize that mold cavity is abundant when melten gel fills die cavity
Filling is a kind of good method；But when in this way, in the moment that liquid drugs injection valve is opened, the melten gel in die cavity pours in down a chimney into water
Cause liquid drugs injection to block in pin mechanism and influence the continuity of production；Opening the switch valve between connection die cavity and material overflow cavity simultaneously
When using water shaping afterwards, melten gel pressure relaxes in die cavity, it is impossible to the shrinkage porosite/Shrinkage Problem being fully solved in product wall.2012
19 days 09 month year, Authorization Notice No. disclosed in Chinese patent literature：CN102672921B《The shaping of thermoplastic resin hollow product
Method》In, the present inventor proposes the method reversely pressurizeed using gases at high pressure in melten gel filling process to solve water shaping
In the presence of shrinkage porosite or the problems such as/shrinkage cavity, although there is good effect, found in implementation process to the close of mold cavity
The deficiencies of envelope requires higher, and implementation cost is higher, while can not solve liquid drugs injection blockage problem using the method.
The content of the invention
The present invention seeks to according to existing deficiency during above-mentioned existing water shaping hollow product, there is provided one kind is used to flow
The system and device of body aid injection molding.
The present invention is mainly by injection moulding machine 100, current injection control device 200, gases at high pressure injection control device
300th, injection forming mold 400, water needle device 3 and connecting pipe composition；Wherein, the injection forming mold 400 is arranged on note
On molding machine 100, injection forming mold 400 has the die cavity 2, material overflow cavity 5, connection die cavity 2 of shaping hollow product 6 after closing
With the interface channel 4 of material overflow cavity 5, and switch valve 4a and current limliting are sequentially arranged on the interface channel 4 from die cavity 2 to material overflow cavity 5
Element 4b；Wherein, the water needle device 3 is fixed on injection mould 400, has independent water passage 3b and gas passage 3c
And it is connected respectively with current injection control device 200 and gases at high pressure injection control device 300 by connecting pipe, stream therein
Body output end 3a includes pressed gas delivery outlet and current delivery outlet, and in die cavity 2.
Advantages of the present invention, the product inner wall smooth produced using present system, be much better than light water auxiliary technique institute into
The inwall of type product, do not find thin-walled position filling existing during the auxiliary injection molding of general water not exclusively and shrinkage cavity/shrinkage porosite/point
The defects of layer.
Brief description of the drawings
Fig. 1 present system schematic diagrames；
Mould arranges schematic diagram in Fig. 2 present invention；
Water needle device schematic diagram in Fig. 3 present invention；
Current limiting element schematic diagram in Fig. 4 present invention；
Fig. 5 forming method step schematic diagrams of the present invention；
Fig. 6 forming method step schematic diagrams of the present invention；
Fig. 7 forming method step schematic diagrams of the present invention；
Fig. 8 forming method step schematic diagrams of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawings by specific embodiment, the technical characteristic and its correlation technique spy spy of the present invention are done into one
Step illustrates：
As Fig. 1-8 illustrates, the label in figure represents respectively：100-injection moulding machine, 200-current injection control dress
Put, 300-gases at high pressure injection control device, 400-injection forming mold, 1a-dynamic model, 1b-cover half, 2-mould
Die cavity, 3-water needle device, 3a-fluid exit, 3b-water passage, 3c-gas passage, 4-interface channel, 4a-
Switch valve, 4b-current limiting element, 5-material overflow cavity, 6-hollow product, 6b-technique clout, 6c-externally it is fixedly connected with knot
Structure, 7-water, 8-enter cast gate, 8a-runner system, 9-injection machine injecting unit
The hollow product 6 made for the present embodiment as shown in Figure 8, is a hollow water pipe, resin material used is
Glass fiber enhanced nylon 66（PA66+30%GF）, resin density 1.35g/cm3, wherein, the water pipe external diameter is 22mm, hollow hole
17 mm of diameter ± 0.5mm.
Fig. 1 show injection molding system used by the present embodiment, wherein, injection machine 100 is represented using picture frame, note
9 signals of molding machine injecting unit, are 400 tons of clamp force injection machines；Current injection control device 200 is made by oneself for the present inventor
Set of device, the injection length of PLC technology water, output volume flow rate and output cumulative volume, include the dynamical system of output
Deng；Gases at high pressure injection control device 300 is the homemade set of device of the present inventor, during the output of PLC technology pressed gas
Between, the through and off etc. of output pressure, gas output, and the supercharging device including gas；As depicted in figs. 1 and 2, it is this embodiment party
Mould structure used by case, including dynamic model 1a and cover half 1b, mould form the mold cavity 2 of shaping hollow tube, overflow after closing
The interface channel 4 of chamber 5, connection mold cavity 2 and material overflow cavity 5 is expected, from mold cavity 2 to the side of material overflow cavity 5 on interface channel 4
To switch valve 4a and current limiting element 4b is set gradually, runner system 8a is provided with cover half 1b, passes through glue-feeder 8 and mould type
Chamber 2 connects；In the present embodiment, used water needle device 3 such as Fig. 3 illustrates, and water needle device 3 is fixed on injection forming mold 400
On, there is independent water passage（3b）And gas passage（3c）Injected respectively with current injection control device 200 and gases at high pressure
Control device 300 connects, and the fluid exit 3a of water needle device 3 is located in mold cavity 2, contains water passage 3b and gas leads to
Road 3c delivery outlet, so as to which pressed gas and current are injected into die cavity 2 in molten resin body, wherein gas passage 3c's is defeated
Outlet is arranged to a kind of narrow slit structure for only allowing pressed gas to pass through, and in the centre of water passage 3b delivery outlets.For fully into
The hollow space of type product, the interface channel 4 between water needle device 3 and die cavity 2 and material overflow cavity 5 are arranged in be formed in product
The one end at the both ends of the die cavity of empty part, i.e. product hollow space imports fluid, and the other end of product hollow space sets connection
Passage and material overflow cavity；For some complicated products, there may be multiple interconnected hollow spaces, at this moment can be by water needle device
Hollow space one end therein is arranged in, and interface channel and material overflow cavity are set respectively in the end of remaining hollow branch, and
On each interface channel, switch valve and current limiting element are respectively provided with, to be controlled and to be molded respectively.
Injection moulded products are generally designed one or more structures being connected with exterior part, as shown in FIG.
External connecting structure 6c, the wall thickness of these structures is typically as product others thin-walled position, and wall thickness is in 2.5mm or so.
Because the mold cavity space of moulded products hollow space is big, resistance is small when molten resin fills die cavity, can preferentially be filled；And
Easily there is lack of fill or not because filling resistance is big in other thin-walled portions of external connecting structure 6c and product in product
The problems such as closely knit, cause product lack material or intensity decline the defects of.To solve these problems, the present inventor is in specific embodiment
In, by first being injected in the water needle device 3 for introducing pressed gas and current respectively when the switch valve 4a on interface channel 4 is closed
Pressed gas makes die cavity 2 be melt melt resin fully to fill, and is molded required attachment structure 6c；Then open on interface channel 4
Switch valve 4a, when injecting current and releasing the not solidified molten resin of hollow space, pass through the limit being arranged on interface channel 4
Fluid element 4b effect, maintain not solidify molten resin in sufficient forming under the pressure hollow space in die cavity 2, eliminate and making
The risk for producing shrinkage porosite/shrinkage cavity and intensity decline in product.Filled to be established when injecting current to the molten resin in die cavity 2
The pressure divided, current limiting element 4b latus rectum set 1/3 less than product hollow space latus rectum, and preferably smaller than product hollow space leads to
The 1/4 of footpath.
Fig. 2 and Fig. 5 to Fig. 8 illustrates to be molded several steps of hollow product, and specific method includes the following steps：
Guan Bi mould, now, water needle device 3 are in the closed position, and switch valve 4a is in the closed position；Injection moulding machine
Injecting unit 9 injects scheduled volume molten thermoplastic resin into the die cavity 2 of mould 400, makes to fill in the die cavity 2 before switch valve 4a
Divide filling molten thermoplastic resin, the fluid exit 3a of water needle device 3 is melt melt resin and coated completely, as shown in Figure 2；Complete
Into while injecting molten thermoplastic resin into die cavity 2, gases at high pressure injection control device 300 is triggered, according to setting in advance
Fixed pressure in resinites of the gas passage 3c of water needle device 3 into die cavity 2 by injecting pressed gas, the pressure injected
Gas pressure is higher than the pressure of die cavity molten resin body, such as a pressure between 150bar -300bar, promotes in die cavity
Molten resin filled up completely with mould die cavity 2, form the thin-wall construction of product, and before the fluid exit 3a of water needle device 3
Portion forms a pressed gas space, persistently injects gas until the melten gel in die cavity reaches gas pressure set in advance
Pressed gas space pressure anterior the fluid exit 3a of power, i.e. water needle device 3 reaches gas pressure set in advance；This
When, triggering current injection control device 200 injects water in the water passage 3b into water needle device 3, and one is established in water passage 3b
The pressure of individual setting, such as 50 bar；Then, at the same open water needle device 3 water passage 3b and beat switch valve 4a, and stop to
Supply pressure gas in water needle device 3, current injection control device 200 press volume flow rate set in advance by water needle device 3
With injection water 7 in molten thermoplastic resin's body of the injected slurry volume into die cavity 2, the not solidified thermoplastic resin of core is promoted to pass through
Current limiting element 4b enters material overflow cavity 5, in the presence of current limiting element 4b, makes to protect in molten thermoplastic resin's body in die cavity 2
Sufficient pressure is held, the pressure energy in the molten resin body is shown by injecting the pressure of water, as shown in Figure 6；Complete
After injecting the water of predetermined in resinite into die cavity 2, stop water filling；Then formerly inject and be present in water column and resin
Between pressed gas effect under, and under the Gravitative Loads of water, hollow product reclaimed water after cooled and solidified is passed through into water needle device 3
Water passage 3b discharge, as shown in fig. 7, the water being excluded can return to current injection control device 200, can also be discharged in factory
Cistern in, do not express in figure；Pickup is molded, technique is removed and expects such as glue-feeder 8 and interface channel and flash 6b, in acquisition
Empty product 6 is as shown in Figure 8.
In the present embodiment, the present inventor is according to such scheme, according to thermoplastic resin（PA66+30GF）Physical property and production
The size of product, dynamic model 1a and cover half 1b temperature are set and controlled at 120 DEG C, the temperature of water is 70 DEG C, the pressure of pressed gas
Power is set as 200 bar, and the latus rectum of current limiting element is set to 4mm, and the initial pressure in water needle device in aquaporin is set to 30bar,
The speed that current are injected into die cavity is set to 15 liters/min, and the volume for injecting water is set to 600 milliliters, last whole injection molding
Cycle is 40 seconds；Continuously shaped 50 mould, the phenomenon that water needle device is blocked by melten gel does not occur；By dissecting product inspection, not only
Thin-walled position filling existing during the auxiliary injection molding of general water is not found not exclusively and the defects of shrinkage cavity/shrinkage porosite/layering, and
The deviation of bore is less than desired ± 0.5mm scopes in the range of ± 0.3mm, and also it has unexpectedly been discovered that, the inwall light of pipe
It is sliding, it is much better than the inwall of the auxiliary technique institute moulded products of light water；Each position sampling and testing, strength character etc. meet wanting for product
Ask.
Although above referring to the drawings to being elaborated according to the design of the object of the invention, people in the art
Member will recognize, in the case where limiting the precondition of scope without departing from claim, still the present invention can be made various
Modifications and variations, and this modifications and variations still should belong to protection scope of the present invention.
Claims (1)
1. the system of fluid-assisted injection shaping, is characterized in, mainly by injection moulding machine（100）, current injection control device
（200）, gases at high pressure injection control device（300）, injection forming mold（400）, water needle device（3）Formed with connecting pipe；
Wherein, the injection forming mold（400）Installed in injection moulding machine（100）On, injection forming mold（400）Have after closure
It is molded hollow product（6）Die cavity（2）, material overflow cavity（5）, connection die cavity（2）And material overflow cavity（5）Interface channel（4）, and certainly
Die cavity（2）To material overflow cavity（5）Interface channel（4）On be sequentially arranged switch valve（4a）And current limiting element（4b）；Wherein, the water
Needle device（3）It is fixed on injection mould（400）On, there is independent water passage（3b）And gas passage（3c）And pass through connection
Pipeline respectively with current injection control device（200）With gases at high pressure injection control device（300）Connection, fluid output therein
End（3a）Comprising pressed gas delivery outlet and current delivery outlet, and it is located at die cavity（2）In.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510049933.4A CN104552767B (en) | 2015-01-31 | 2015-01-31 | The system of fluid-assisted injection shaping |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510049933.4A CN104552767B (en) | 2015-01-31 | 2015-01-31 | The system of fluid-assisted injection shaping |
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| CN104552767A CN104552767A (en) | 2015-04-29 |
| CN104552767B true CN104552767B (en) | 2017-11-17 |
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| CN106217774A (en) * | 2016-07-29 | 2016-12-14 | 江西通达实业有限公司 | A kind of water pipe moulding process of New type water pipe mould and this mould |
| CN112140470A (en) * | 2020-08-28 | 2020-12-29 | 金发科技股份有限公司 | Flash tank, injection molding device for manufacturing DDR connector and quality inspection method |
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| IT1397058B1 (en) * | 2009-11-23 | 2012-12-28 | Nuovo Pignone Spa | CENTRIFUGAL IMPELLER MOLD, MOLD INSERTS AND METHOD TO BUILD A CENTRIFUGAL IMPELLER |
| JP5642760B2 (en) * | 2011-12-02 | 2014-12-17 | Ckd株式会社 | Fluid control valve |
| CN204487940U (en) * | 2015-01-31 | 2015-07-22 | 北京中拓机械集团有限责任公司 | The system that fluid-assisted injection is shaping |
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