CN102990881A - Water-assisted injection molding process method - Google Patents
Water-assisted injection molding process method Download PDFInfo
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- CN102990881A CN102990881A CN2012105318007A CN201210531800A CN102990881A CN 102990881 A CN102990881 A CN 102990881A CN 2012105318007 A CN2012105318007 A CN 2012105318007A CN 201210531800 A CN201210531800 A CN 201210531800A CN 102990881 A CN102990881 A CN 102990881A
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Abstract
The invention relates to a water-assisted injection molding process method; the invention is characterized in that the method comprises the following steps: step one, heating a charging barrel of an injection molding machine to 300-315 DEG C; heating a mold to 80-110 DEG C; heating water to 60-80 DEG C; step two, injecting raw materials into a cavity to fill 60-80% of the cavity; step three, starting water injection with a water pressure of 10-20 Mpa, maintaining the pressure for 5-10 s; step four, compressing air to blow out water in the product with a pressure of 0.6-0.8 Mpa, maintaining the pressure for 10-15 s; step five, opening the mold, and taking the product out to finish the processing. The method of the invention improves the processing efficiency and the product quality, saves materials, reduces the production cost, and can process hollow products with large diameters very well.
Description
Technical field
The present invention relates to a kind of moulding process of automobile-used pipeline, relate in particular to a kind of process by water-aid injection molding.Belong to technical field of automobile parts.
Background technology
At present, the pipe on the automobile has two kinds of processing methods, and a kind of is extrusion molding, and another kind is injection mo(u)lding.The mode of extruding mainly is to use die head or module to produce straight tube, by former straight tube is machined to the shape of requirement again, then forms pipe-line systems at some parts of pipe assembling.Sometimes need be designed to the pipeline of threeway, that must assemble a three-way connection (or triple valve) between pipe, could realize.Other parts merchant just need to fix pipeline at the fixtures such as assigned address assembling pipe clamp of pipe in vehicle body or the car if pipe-line system will be fixed on.The technique of injection moulding then be directly by injection mold with the pipe one-shot forming, settle at one go, be made of one (the comprising three-port structure and fixing support) of formula.
Compare with extrusion way, injection mo(u)lding has not only been saved the time, and has saved several procedures, has also reduced very large cost simultaneously, generally adopts gas assistant injection molding, gas assistant injection molding (
GAIM) be a kind of inert gas to be injected the specific melt region of product to form the technology of hollw article.This technology starts from the eighties in 20th century, has to reduce buckling deformation, indenture, improves surface quality, alleviates quality of item, shortens molding cycle, the advantages such as goods that plastic Wall-Thickness Difference is larger.At present
GAIMTechnology has been widely used in the manufacturing field of automobile, household electrical appliances, furniture, articles for daily use etc.
But
GAIMTechnology can not production major diameter goods shortcoming, limited its application.In addition for the production of the relatively large media lines of diameter,
GAIMStill there is relatively large product wall thickness in technique, again because gas transferring heat internally causes increase cool time, thereby the danger of flux foaming increase, for fear of foaming, the earth pressure release time of the dwell time of gas or gas is extended, certainly, so also increased circulation timei.When the diameter of product surpasses 40 mm, after air flue forms, the danger that also can exist melt to flow downward along die wall.Therefore,
GAIMBe difficult to be applied to the moulding of the larger hollow product of diameter.
Summary of the invention
The object of the invention is to overcome above-mentioned deficiency, a kind of water-aid injection molding process is provided, improved the quality of working (machining) efficiency and product, save material, reduced production cost, can well process the larger hollow product of diameter simultaneously.
The object of the present invention is achieved like this: a kind of water-aid injection molding process said method comprising the steps of:
Step 1, production are prepared
Injecting machine material tube is heated to 300-315 ℃; Mold temperature is heated to 80-100 ℃; Water temp. heating is to 60-80 ℃;
Step 2, injection material
The end of raw material in the above-mentioned injecting machine material tube by mould injected the die cavity of the full mould of injection;
Step 3, die cavity water filling
To be marked with raw-material mould other end implantation temperature be 60-80 ℃ warm water to above-mentioned, and warm water pressure is 10-20Mpa, keeps this pressure 5-10s;
Step 4, air pressure draining
Pass into compressed air in the above-mentioned mold cavity that is marked with raw material and warm water, under compressed-air actuated effect water is discharged, compressed-air actuated pressure is 0.6-0.8Mpa, keeps this pressure 10-15s;
Step 5, die sinking
Above-mentioned mould is opened, taken out product, machine.
The process principle of water-aid injection molding technology:
Main difference is that gas has compressibility between water and the gas, and water can not.Just because of with respect to gas, the viscosity of water and Incoercibility so that water can in hollow molding, work.During injecting, when the mode that can not evaporate with water is injected, the forward position of water resembles and acts on the molten core of product the mobile plunger, from the forward position of water to the changeover portion of melt, solidified the very thin plastic foil of one deck, it resembles a full-bodied core, further promotes polymer melt, thereby product is emptied.Water pressure pushing it when advancing, water also cools off melt.Utilize at last gravity or compressed air that water is discharged from product, flow to a storage tank, water can recycle use.Water-aid injection molding can greatly shorten the molding cycle of goods, can be used for production lightweight, firm hollow product, and has good appearance effect.
Compared with prior art, the present invention has following beneficial effect and is:
1, water-aid injection molding is the core that the water under high pressure of uniform temperature is injected melt in the die cavity, therefore water can be directly cools off goods from the core of product wall thickness, and this cooling is along with from inside to outside stepless action of article shape, cooling fully, effective, therefore can greatly shorten the molding cycle of goods;
2, inject the melt of die cavity in the water assistant formation, under the effect of water pressure up to nearly 10-20Mpa, to be close to die cavity wall to flow with cooling curing, the effect that the whole moulding contraction of goods and cooling and shaping process are subject to the water pressure of own product core all the time, product wall thickness density is high, cooling is evenly shunk unanimously, and surfacing is without shrink mark, do not have warpage and torsional deformation, presentation quality is good;
3, since the used coolant-temperature gage of water assistant formation far below melt temperature, so the interface that the water that injects die cavity contacts with high-temperature fusant can form the smooth high viscosity cured film of one deck immediately because melt temperature reduces rapidly, the water of cured film inboard is outwards evenly exerted pressure under pressure, make the product wall thickness pressurized of ot-yet-hardened and attenuate, but water can not penetrate cured film and enter wall thickness, the melt on the front sharp side of current is passed forward under effect of water pressure more melt is flowed forward simultaneously, thereby obtains the goods that wall thickness is thinner and inner surface is smooth;
4, thinner goods of the plastic wall thickness that can reach than gas assistant formation of water assistant formation, thereby save material alleviate product weight, reduce cost, and experiment shows that water aided injection forming can save material 30%～40%.
The specific embodiment
The present invention relates to a kind of water-aid injection molding process, said method comprising the steps of:
Step 1, production are prepared
Injecting machine material tube is heated to 300-315 ℃; Mold temperature is heated to 80-100 ℃; Water temp. heating is to 60-80 ℃;
Step 2, injection material
The end of raw material in the above-mentioned injecting machine material tube by mould injected the die cavity of the full mould of injection;
Step 3, die cavity water filling
To be marked with raw-material mould other end implantation temperature be 60-80 ℃ warm water to above-mentioned, injects quantitative warm water (come according to the size of product fixed), and warm water pressure is 10-20Mpa, keeps this pressure 5-10s;
Step 4, air pressure draining
Pass into compressed air in the above-mentioned mold cavity that is marked with raw material and warm water, under compressed-air actuated effect water is discharged, compressed-air actuated pressure is 0.6-0.8Mpa, keeps this pressure 10-15s;
Step 5, die sinking
Above-mentioned mould is opened, taken out product, machine.
Claims (1)
1. water-aid injection molding process is characterized in that said method comprising the steps of:
Step 1, production are prepared
Injecting machine material tube is heated to 300-315 ℃; Mold temperature is heated to 80-100 ℃; Water temp. heating is to 60-80 ℃;
Step 2, injection material
The end of raw material in the above-mentioned injecting machine material tube by mould injected the die cavity of the full mould of injection;
Step 3, die cavity water filling
To be marked with raw-material mould other end implantation temperature be 60-80 ℃ warm water to above-mentioned, and warm water pressure is 10-20Mpa, keeps this pressure 5-10s;
Step 4, air pressure draining
Pass into compressed air in the above-mentioned mold cavity that is marked with raw material and warm water, compressed-air actuated pressure is 0.6-0.8Mpa, keeps this pressure 10-15s;
Step 5, die sinking
Above-mentioned mould is opened, taken out product, machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105318007A CN102990881A (en) | 2012-12-12 | 2012-12-12 | Water-assisted injection molding process method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105318007A CN102990881A (en) | 2012-12-12 | 2012-12-12 | Water-assisted injection molding process method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102990881A true CN102990881A (en) | 2013-03-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012105318007A Pending CN102990881A (en) | 2012-12-12 | 2012-12-12 | Water-assisted injection molding process method |
Country Status (1)
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105965771A (en) * | 2016-05-03 | 2016-09-28 | 江阴标榜汽车部件有限公司 | High molecular material pipeline injection moulding technology |
| CN110435079A (en) * | 2019-08-06 | 2019-11-12 | 宁波信泰机械有限公司 | A kind of auxiliary injection moulding apparatus of automobile luggage racks water and method |
| CN113263685A (en) * | 2021-04-23 | 2021-08-17 | 宝顿电子机械股份有限公司 | Injection molding process for slender water pipe |
Citations (6)
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| JPH10151647A (en) * | 1996-11-21 | 1998-06-09 | Marusho:Kk | Injection mold |
| JP2006213041A (en) * | 2005-02-07 | 2006-08-17 | Shisuko:Kk | Heating-cooling system of mold and mold apparatus for hollow injection molded product |
| CN201002331Y (en) * | 2006-12-30 | 2008-01-09 | 浙江大学 | Water assisted forming water hydraulic proportion system |
| CN102029695A (en) * | 2010-11-15 | 2011-04-27 | 昆山乙盛机械工业有限公司 | Sharp quenching and sharp heating highlight molding technology of die |
| CN102285060A (en) * | 2011-07-22 | 2011-12-21 | 韩国海 | Water-assisted molding process and constant pressure water-assisted injection molding equipment |
| CN102672921A (en) * | 2012-01-16 | 2012-09-19 | 北京中拓机械有限责任公司 | Molding method of hollow products made of thermoplastic resin |
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2012
- 2012-12-12 CN CN2012105318007A patent/CN102990881A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10151647A (en) * | 1996-11-21 | 1998-06-09 | Marusho:Kk | Injection mold |
| JP2006213041A (en) * | 2005-02-07 | 2006-08-17 | Shisuko:Kk | Heating-cooling system of mold and mold apparatus for hollow injection molded product |
| CN201002331Y (en) * | 2006-12-30 | 2008-01-09 | 浙江大学 | Water assisted forming water hydraulic proportion system |
| CN102029695A (en) * | 2010-11-15 | 2011-04-27 | 昆山乙盛机械工业有限公司 | Sharp quenching and sharp heating highlight molding technology of die |
| CN102285060A (en) * | 2011-07-22 | 2011-12-21 | 韩国海 | Water-assisted molding process and constant pressure water-assisted injection molding equipment |
| CN102672921A (en) * | 2012-01-16 | 2012-09-19 | 北京中拓机械有限责任公司 | Molding method of hollow products made of thermoplastic resin |
Non-Patent Citations (2)
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| 刘旭辉 等: "熔体温度对水穿透行为影响的可视化研究", 《中国塑料》 * |
| 洪慎章: "《实用注塑成型及模具设计》", 28 February 2006 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105965771A (en) * | 2016-05-03 | 2016-09-28 | 江阴标榜汽车部件有限公司 | High molecular material pipeline injection moulding technology |
| CN110435079A (en) * | 2019-08-06 | 2019-11-12 | 宁波信泰机械有限公司 | A kind of auxiliary injection moulding apparatus of automobile luggage racks water and method |
| CN113263685A (en) * | 2021-04-23 | 2021-08-17 | 宝顿电子机械股份有限公司 | Injection molding process for slender water pipe |
| CN113263685B (en) * | 2021-04-23 | 2023-03-14 | 宝顿电子机械股份有限公司 | Injection molding process for slender water pipe |
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Application publication date: 20130327 |