CN1891430A - Car sundries box gas auxiliary injection moulding - Google Patents
Car sundries box gas auxiliary injection moulding Download PDFInfo
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- CN1891430A CN1891430A CN 200510016927 CN200510016927A CN1891430A CN 1891430 A CN1891430 A CN 1891430A CN 200510016927 CN200510016927 CN 200510016927 CN 200510016927 A CN200510016927 A CN 200510016927A CN 1891430 A CN1891430 A CN 1891430A
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Abstract
This invention relates to a technology for producing car sundries boxes with a gas-assisting injection molding technology including an optimum design of a casting system, layout of gas channels and selection of diameter parameters aimed at injecting controlled high pressure inert gas into a plastic melt by a preset gas channel to form hollow gas channels in the melt so as to press the melt tightly to the surface of the cavity to form high qualified sundries boxes.
Description
Technical field:
The present invention relates to use the production that the gas assistant injection molding technology realizes the car sundries box plastic products, be the technology that the gas assistant injection molding technology is made car sundries box, comprise the optimal design of running gate system, the layout of gas passage, selection of dimensional parameters or the like, belong to the Plastics Injection Molding Technology field.
Background technology:
The injection moulding of car plastics glove compartment normally is expelled to the plastics of fusion in the mold cavity, and cooling back forms required product, reach eject temperature after, mold open takes out product.Because car plastics glove compartment is a kind of housing product of complexity, when adopting conventional injection molding technology to produce, can produce the shrink mark phenomenon in the zone of became uneven, defectives such as warpage and distortion also appear in the planar section of bottom easily.In order to address the above problem, a kind of emerging gas auxiliary injection molding process has abroad appearred, Volume Changes or pressure by control gas change pressure and the speed of adjusting injected gas, reach selectivity and empty the thick wall area of melt product, thus defectives such as the shrink mark of inhibition finished product, buckling deformation.But its fabrication process condition is difficult to control, and the moulding window is comparatively narrow.
Summary of the invention:
The invention provides layout, dimensional parameters selection of optimal design, the gas passage of a kind of production method of gas assistant injection molding car plastics glove compartment and running gate system thereof etc., purpose is by default gas passage to the inner high-pressure inert gas (normally nitrogen) that injects through control of plastic melt, at the inner hollow gas passage that forms of melt, thereby melt is pressed on cavity surface, the high-quality glove compartment product of moulding appearance good quality, no shrink mark, buckling deformation.By the Design of Runner System of rationally determining, the layout of gas passage and size Selection reach the mechanical performance that reduces the moulding injection pressure, improves product.
Gas assistant injection molding car sundries box processing technology comprises four parts such as running gate system, gas passage are arranged, dimensional parameters is selected, gas assisted molding device technique parameter is determined.It is characterized in that: by the gas passage that designs in advance, after the melt injection process finished, the gases at high pressure of gas assisted molding device output entered the melt core through the gas injection point of mould inside, promoted melt and finished the last filling process of mould.According to the moulding requirement of this car sundries box housing, respectively be provided with a gas passage along the above-below direction transitional region of housing, diameter is between 1.1-1.3 times of glove compartment housing wall thickness, and optimum diameter is 1.2 times of glove compartment housing wall thickness.
In this car sundries box process of gas assistant injection molding, according to the moulding requirement of glove compartment and the raw material that use, the injection volume in advance of melt is between 95%-98%, and best preform injection amount is 96%.After both can having avoided occurring gas injection melt this moment,, cause the product part to blow and wear because the injection volume in advance of melt is too small; For traditional moulding process, saved raw-material use amount again.The pin type cast gate is adopted in the melt injection, and quantity is 1, and behind mold open, running gate system is separated with the glove compartment product.The air tube of corresponding gas injection point is arranged in the core rod part of mould, and quantity is 2.The other end links to each other with the gas passage that is opened in mould inside, and is connected the gases at high pressure output interface place of gas assisted molding device by flexible pipe.The selection of gas assistant injection molding, gas injection point position and the quantity of corresponding other automobile glove compartment product is still effective.
Description of drawings:
Fig. 1 is a structure principle chart of the present invention;
Fig. 2 is the pathway structure schematic diagram in the structure principle chart of the present invention.
The specific embodiment:
Art designs scheme of the present invention is as follows: car sundries box is complex-curved housing.Because the above-below direction transition region of glove compartment front panel all is a thick wall area, this place respectively lays a gas passage, and its cross section is a sub-circular.Gas passage runs through glove compartment along thick wall area, and length is about 0.8 times of product total length, and thickness is about 1.1 times of origianl wall thickness, and in the gas assisted molding process, gases at high pressure will be located gas passage along this and advance, thereby can effectively prevent the generation of surperficial shrink mark.The device of gas assistant injection molding is not described in detail at this.
In the forming process, melt at first enters die cavity by the cast gate that is arranged on the glove compartment, fills the mould inside die cavity according to traditional injection moulding pattern, because the follow-up gas injection process that also exists, therefore should calculate the injection volume of melt in advance, so that reserve the volume that gas takes up space.Usually the melt injection volume in the gas assistant injection molding is between 60%-98%, and by analysis, the melt injection volume of this glove compartment can be between 90%-98%, and the optimal injection amount is 96%.After the melt injection process finishes, through the time delay of regulation, the gas injection point that the gases at high pressure of gas assistant injection molding equipment output are set at mould inside is injected into the melt core, the wall thickness of gas passage zone is bigger, so melt core temperature height, gas is easy to charge into, thereby promotes the end that melt is charged to die cavity.But gas injection pressure is too high, can cause the local appearance of gas passage " gas refers to " phenomenon, and causes near too attenuate of the remaining wall thickness of the melt of gas injection point, causes the intensity of product, bearing capacity to descend.By analysis, the injection pressure of gas can be at 20-30Mpa, can cause the melt can't the complete filling die cavity less than 20Mpa, causes parts scrap; Be higher than 30Mpa and " gas refers to " noted earlier phenomenon then can occur, can not obtain the product of acceptable quality equally.
Can gas passage be the parameter of a key in assisted injection molding techniques, realize successfully that to product the auxilliary technology of gas plays crucial effects.The one end links to each other with the gas injection point, and the other end extends to the side direction end along the housing of glove compartment.The gas passage size adopts 1.1～1.2 times of thickness of glove compartment main casing wall thickness by analysis, and cross sectional shape is a sub-circular.Can obtain best gas filling effect like this.
The gas injection point is 2, is symmetrically distributed in the above-below direction of glove compartment front panel, links to each other with gas passage.Mould inside is embedded with the gas injection pin, and an end contacts with the gas injection point, and the other end links to each other with the gases at high pressure output gas path joint of gas assistant formation device by the gas circuit of mould inside.
The running gate system of glove compartment housing comprises sprue, runner and cast gate, is used to guarantee that melt enters die cavity smoothly, and loading mould cavity inner space balancedly.Therefore its position and dimensional parameters select that the quality of product is had significant effects.Cast gate is arranged on the edge center place of glove compartment upper bottom portion housing, and quantity is 1.The type of cast gate is the pin type cast gate.Sprue is conical.Behind the mold open, running gate system is separated with the glove compartment product, can reuse after pulverizing.
The glove compartment mould mainly is divided into die cavity and core rod two parts.The corresponding gas injection point of core rod part place is furnished with 2 air tubes respectively.And corresponding gas passage is in and processes corresponding shape in the mould.
The invention has the advantages that, avoided caused blemish of traditional injection moulding glove compartment such as problems such as shrink mark, warpage, can reduce the injector tonnage significantly simultaneously, save raw material, shorten cool time, enhance productivity.
Claims (6)
1, car sundries box gas auxiliary injection moulding technology comprises four parts such as running gate system, gas passage are arranged, dimensional parameters is selected, gas assisted molding device technique parameter is determined.It is characterized in that: by the gas passage that designs in advance, after the melt injection process finished, the gases at high pressure of gas assisted molding device output entered the melt core through the gas injection point of mould inside, promoted melt and finished the last filling process of mould.
2, car sundries box gas auxiliary injection moulding technology according to claim 1, it is characterized in that: according to the moulding requirement of this car sundries box housing, above-below direction transitional region along housing respectively is provided with a gas passage, diameter is between 1.1-1.3 times of glove compartment housing wall thickness, and optimum diameter is 1.2 times of glove compartment housing wall thickness.
3, according to claim 1,2 described car sundries box gas auxiliary injection moulding technologies, it is characterized in that: in this car sundries box process of gas assistant injection molding, according to the moulding requirement of glove compartment and the raw material that use, the injection volume in advance of melt is between 95%-98%, and best preform injection amount is 96%.After both can having avoided occurring gas injection melt this moment,, cause the product part to blow and wear because the injection volume in advance of melt is too small; For traditional moulding process, saved raw-material use amount again.
4, according to claim 1,2,3 described car sundries box gas auxiliary injection moulding technologies, it is characterized in that: the pin type cast gate is adopted in the melt injection, and quantity is 1, and behind mold open, running gate system is separated with the glove compartment product.
5, according to claim 1,2,3 described car sundries box gas auxiliary injection moulding technologies, it is characterized in that: the air tube of corresponding gas injection point is arranged in the core rod part of mould, and quantity is 2.The other end links to each other with the gas passage that is opened in mould inside, and is connected the gases at high pressure output interface place of gas assisted molding device by flexible pipe.
6, according to claim 1,2,3,4,5 described requirements, it is characterized in that: the selection of gas assistant injection molding, gas injection point position and the quantity of corresponding other automobile glove compartment product is still effective.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510016927 CN1891430A (en) | 2005-07-01 | 2005-07-01 | Car sundries box gas auxiliary injection moulding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510016927 CN1891430A (en) | 2005-07-01 | 2005-07-01 | Car sundries box gas auxiliary injection moulding |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1891430A true CN1891430A (en) | 2007-01-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510016927 Pending CN1891430A (en) | 2005-07-01 | 2005-07-01 | Car sundries box gas auxiliary injection moulding |
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| Country | Link |
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| CN (1) | CN1891430A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105729728A (en) * | 2016-03-15 | 2016-07-06 | 江西五十铃汽车有限公司 | Method for gas-assisted injection molding of automobile instrument board |
| CN109910572A (en) * | 2017-12-13 | 2019-06-21 | 现代自动车株式会社 | The car door of vehicle |
| WO2022198247A1 (en) | 2021-03-24 | 2022-09-29 | Kogelnik Holding Gmbh | Container, especially suitcase, comprising at least one half-shell component or shell |
-
2005
- 2005-07-01 CN CN 200510016927 patent/CN1891430A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105729728A (en) * | 2016-03-15 | 2016-07-06 | 江西五十铃汽车有限公司 | Method for gas-assisted injection molding of automobile instrument board |
| CN109910572A (en) * | 2017-12-13 | 2019-06-21 | 现代自动车株式会社 | The car door of vehicle |
| WO2022198247A1 (en) | 2021-03-24 | 2022-09-29 | Kogelnik Holding Gmbh | Container, especially suitcase, comprising at least one half-shell component or shell |
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