CN101367261A - Centreless injection molding manufacturing technique for special-shaped tube and automobile water tank plastic cooling water tube - Google Patents
Centreless injection molding manufacturing technique for special-shaped tube and automobile water tank plastic cooling water tube Download PDFInfo
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- CN101367261A CN101367261A CNA2008100512837A CN200810051283A CN101367261A CN 101367261 A CN101367261 A CN 101367261A CN A2008100512837 A CNA2008100512837 A CN A2008100512837A CN 200810051283 A CN200810051283 A CN 200810051283A CN 101367261 A CN101367261 A CN 101367261A
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- injection molding
- injection
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- tube
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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
- B29C2045/1719—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 making tubular articles
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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
- B29C2045/1724—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 hollows used as conduits
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- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The invention provides a coreless injection molding process for special shaped pipes. The process comprises the following steps: injection molding pretreatment is carried out to a plastic material; the plastic material is completely plasticated into a molten body and then is injected into a special shaped pipe die; pressure is maintained till the material is cooled and solidified to form a tube wall and reach designed thickness; high-pressure gas is injected from one end of the special shaped pipe die; and the molten material which is not solidified in the tube wall is stripped off the tube wall and is blown out from the other end of the special shaped pipe die so as to form a special shaped pipe cavity, and then the coreless injection molding process of a special shaped pipe is completed. The high-pressure gas is adopted to blow out the molten body which is not condensed in the die so as to form the cavity for producing a tubular workpiece, thereby solving the problems that tubular components are complex in cavity shape and a mold core inside the workpiece is difficult to draw off in injection molding processes, and realizing the aim of using an injection molding method to produce cavity pipe fittings in complex shape. As the process utilizes the high-pressure gas to assist in molding and adopts a positive-pressure inflation method, injection molding pipe fittings complex to be molded can be produced, thereby improving production efficiency and reducing the development difficulty of dies.
Description
Technical field:
The present invention discloses a kind of shape tube centreless injection molding process, is used to produce radiator plastic cool water pipe, belongs to plastic products injection molding manufacturing technique technical field.
Background technology:
At present, the moulding of plastic shaped pipe is substantially by extruding hollow blow molding, be to utilize to extrude blow moulding machine and blow out an annular material embryo, close die then, inside charges into the moulding of air inflation, though this method technology is fairly simple, but the parts-moulding that profile is comparatively complicated is also relatively more difficult, and design size and outward appearance are also relatively poor, and this defective is outstanding more when the product wall thickness is big, not quite causes mainly due to the pressure that charges into gas.
The radiator cooling water pipe generally is metal tube or rubber tube.Metal tube is made the shape that meets bulk by bending and guarantee to be used, but many shortcomings such as its cost height (being mainly used in the higher gears vehicle), own wt are heavier, processing difficulties, power consumption.Utilize the forming technique of plastic shaped pipe to produce the radiator cooling water pipe, because the space of components size is comparatively complicated, inner core is impossible extract, the manufacturing of cooling water pipe that can't the implementation structure complexity.
Summary of the invention:
The invention provides a kind of shape tube centreless injection molding process, solved injection moulding and can not produce complex-shaped cavity pipe fitting problem.
The invention also discloses the radiator plastic cool water pipe of this explained hereafter.
Technical solution of the present invention is as follows: plastics materials is carried out the injection moulding preliminary treatment, inject the shape tube mould after fully plasticating into melt, pressurize to material cooled and solidified forms tube wall and reaches design thickness, end by the shape tube mould injects gases at high pressure again, not solidified melt material in the tube wall is peeled off out from tube wall, blow out to the other end, form a shape tube cavity, finish the process of shape tube centreless injection mo(u)lding.
Concrete technology is as follows:
1, drying is good material drops into hopper, fully plastifies through screw in injection molding machine, and it is as follows that injection machine is respectively distinguished temperature: feeding zone 60-90 ℃; 1 district 260-290 ℃; 2 district 260-290 ℃; 3 district 280-290 ℃; 4 district 280-290 ℃; 5 district 280-290 ℃; Nozzle 280-290 ℃; Inject product mold by the injection machine nozzle; Each parameter is as follows during this time:
Screw speed linear velocity 0.7-1.5m/s
Injection pressure is controlled at injection pressure 100-160MPa
Back pressure 2-8MPa is because the too high meeting of back pressure causes plasticizing uneven
Mold temperature is controlled at 60-80 ℃.
2, through after a while pressure maintaining period, dwell pressure, be generally injection pressure 50% (dwell time is according to the size and the wall thickness of goods, this product pressurize 0.2-1 second, reality also is the control product wall thickness in pressure maintaining period, long then product wall thickness of dwell time, short then wall approaches).
3, after pressure maintaining period finishes, utilize nitrogen (this product pressure is adjusted between the 150-200MPa) that the high pressure nitrogen generator produces to inject from an end of mould rapidly the uncooled melt of inner core is blown out, form a cavity because melt is blown and peels off out from the part of having coagulated.
4, high pressure nitrogen is closed, die sinking, and goods eject, and last matched moulds enters next working cycles.
Utilize the auxilliary shaping of high pressure gas, the parts cross section inner core that injection moulding forms is still whole, but internal temperature is near 280-290 ℃; But peripheral temperature is low, reduced to below the glassy state, condensation moulding, according to the length of dwell time, suitable control the thickness of tube wall, with gases at high pressure inner core molten state material is blown out the formation tube chamber.
Good effect of the present invention is: adopt gases at high pressure that the melt of the uncooled part in the mould is blown out formation cavity production tubular workpiece, solved tubular part cavity shape complexity, the workpiece interior core is difficult for the difficult problem of extraction during injection moulding, has realized the complex-shaped cavity pipe fitting purpose of injection moulding production; Utilize that high pressure gas is auxilliary to be shaped, adopt malleation inflation way, injection moulding pipe fitting that can production moulding complexity has improved production efficiency, reduces the development difficulty of mould.
Description of drawings:
Fig. 1 is a centreless injection moulding schematic diagram of the present invention.
Fig. 2 is the radiator plastic cool water pipe structure figure of explained hereafter of the present invention.
The specific embodiment:
By following examples the present invention is described for example further, and do not limit the present invention in any way, under the prerequisite that does not deviate from technical solution of the present invention, any change or change that those of ordinary skills that the present invention did are realized easily all will fall within the claim scope of the present invention.
Embodiment 1
1, raw material drying is handled: if material seals before the processing, so just there is no need drying.If the packing of material is opened or remains material and feed back, the dry processing 4-6 hour in 85 ℃ hot-air so.If humidity greater than 0.2%, also needs to carry out 105 ℃, 12 hours vacuum drying.
2, with reference to Fig. 1, the material that drying is good drops into hopper 1, fully plastifies through screw in injection molding machine 2, and it is as follows that injection machine is respectively distinguished temperature: feeding zone 60-90 ℃; 1 district 260-290 ℃; 2 district 260-290 ℃; 3 district 280-290 ℃; 4 district 280-290 ℃; 5 district 280-290 ℃; Nozzle 280-290 ℃; Inject product mold 3 by the injection machine nozzle; Each parameter is as follows during this time:
Screw speed linear velocity 0.7-1.5m/s
Injection pressure is controlled at injection pressure 100-160MPa
Back pressure 2-8MPa is because the too high meeting of back pressure causes plasticizing uneven
Mold temperature is controlled at 60-80 ℃.
3, through after a while pressure maintaining period, dwell pressure, be generally injection pressure 50% (dwell time is according to the size and the wall thickness of goods, this product pressurize 0.2-1 second, reality also is the control product wall thickness in pressure maintaining period, long then product wall thickness of dwell time, short then wall approaches).
4, after pressure maintaining period finishes, utilize nitrogen (this product pressure is adjusted between the 150-200MPa) that the high pressure nitrogen generator produces to inject from an end of mould rapidly the uncooled melt of inner core is blown out, form a cavity because melt is blown and peels off out from the part of having coagulated.
5, high pressure nitrogen is closed, die sinking, and goods eject, and last matched moulds enters next working cycles.
Embodiment 2
The production technology of radiator plastic cool water pipe is as follows:
1, raw material drying is handled: material dry processing 4-6 hour in 85 ℃ hot-air that PA66 and blend thereof are made.
2, with reference to Fig. 1, the material that drying is good drops into hopper 1, and inventory is according to bucket capacity, and this equipment is 10Kg, fully plastifies through screw in injection molding machine 2, and it is as follows that injection machine is respectively distinguished temperature: feeding zone 60-90 ℃; 1 district 260-290 ℃; 2 district 260-290 ℃; 3 district 280-290 ℃; 4 district 280-290 ℃; 5 district 280-290 ℃; Nozzle 280-290 ℃; Inject product mold 3 by the injection machine nozzle; Each parameter following (referring to the equipment schematic diagram) during this time:
Screw speed linear velocity 0.7-1.5m/s
Injection pressure is controlled at injection pressure 100-160MPa
Back pressure 2-8MPa is because the too high meeting of back pressure causes plasticizing uneven
Mold temperature is controlled at 60-80 ℃.
3, through after a while pressure maintaining period, dwell pressure, be generally injection pressure 50% (dwell time is according to the size and the wall thickness of goods, and this product pressurize 0.5-1 is between second, and reality also is that the control product wall thickness is in the 2.5+0.5mm scope in pressure maintaining period.
4, after pressure maintaining period finishes, utilize nitrogen (this product pressure is adjusted between the 160-200MPa) that the high pressure nitrogen generator produces to inject from an end of mould rapidly the uncooled melt of inner core is blown out, form a cavity because melt is blown and peels off out from the part of having coagulated.
5, high pressure nitrogen is closed, die sinking, and goods eject, and last matched moulds enters next working cycles.
The performance indications data of the popular new Bora radiator plastic cool water pipe that the present invention produces:
| Test item | Specification requirement |
| But extraction component | ≤4％ |
| Hydrolysis | ≥20MPa |
| Elongation at break | ≥80％ |
| Cryogenic property (40 ℃) | Crack-free |
| Hot property (125 ℃) | The profile no change |
| Resistance to ag(e)ing (150 ℃, 200h) | Crack-free |
Claims (3)
1. shape tube centreless injection molding process, it is characterized in that: plastics materials is carried out the injection moulding preliminary treatment, inject the shape tube mould after fully plasticating into melt, pressurize to material cooled and solidified forms tube wall and reaches design thickness, inject gases at high pressure by an end of shape tube mould again, not solidified melt material in the tube wall is peeled off out from tube wall, blow out to the other end, form a shape tube cavity, finish the process of shape tube centreless injection mo(u)lding.
2. the described moulding process of claim 1 may further comprise the steps:
1) drying is good material drops into hopper, fully plastifies through screw in injection molding machine, and it is as follows that injection machine is respectively distinguished temperature: feeding zone 60-90 ℃; 1 district 260-290 ℃; 2 district 260-290 ℃; 3 district 280-290 ℃; 4 district 280-290 ℃; 5 district 280-290 ℃; Nozzle 280-290 ℃; Inject product mold by the injection machine nozzle;
Each parameter is as follows during this time: screw speed linear velocity 0.7-1.5m/s; Injection pressure is controlled at injection pressure 100-160MPa; Back pressure 2-8MPa; Mold temperature is controlled at 60-80 ℃;
2) pressurize to material cooled and solidified forms tube wall and reaches design thickness;
3) after pressure maintaining period finishes, utilize nitrogen that the high pressure nitrogen generator produces, inject from an end of mould rapidly the uncooled melt of inner core is blown out, and peel off out and form a cavity at 150-200MPa;
4) high pressure nitrogen is closed, and die sinking promptly gets goods.
3. according to the radiator plastic cool water pipe of the described explained hereafter of claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100512837A CN101367261A (en) | 2008-10-17 | 2008-10-17 | Centreless injection molding manufacturing technique for special-shaped tube and automobile water tank plastic cooling water tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100512837A CN101367261A (en) | 2008-10-17 | 2008-10-17 | Centreless injection molding manufacturing technique for special-shaped tube and automobile water tank plastic cooling water tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101367261A true CN101367261A (en) | 2009-02-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008100512837A Pending CN101367261A (en) | 2008-10-17 | 2008-10-17 | Centreless injection molding manufacturing technique for special-shaped tube and automobile water tank plastic cooling water tube |
Country Status (1)
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| CN (1) | CN101367261A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011091638A1 (en) * | 2010-01-26 | 2011-08-04 | 华尔达（厦门）塑胶有限公司 | Manufacturing method for water passage of water outlet device |
| CN102635739A (en) * | 2012-02-07 | 2012-08-15 | 常熟市谷雷特机械产品设计有限公司 | Manufacture method of composite pipeline used for building |
| CN102135201B (en) * | 2010-01-26 | 2012-09-05 | 华尔达（厦门）塑胶有限公司 | Water outlet part of temperature-regulating water nozzle and making method thereof |
| CN108688047A (en) * | 2018-05-10 | 2018-10-23 | 朱连成 | Manufacture craft, daily necessities, pillow, pillow and the back cushion of daily necessities |
-
2008
- 2008-10-17 CN CNA2008100512837A patent/CN101367261A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011091638A1 (en) * | 2010-01-26 | 2011-08-04 | 华尔达（厦门）塑胶有限公司 | Manufacturing method for water passage of water outlet device |
| CN102135201B (en) * | 2010-01-26 | 2012-09-05 | 华尔达（厦门）塑胶有限公司 | Water outlet part of temperature-regulating water nozzle and making method thereof |
| CN102635739A (en) * | 2012-02-07 | 2012-08-15 | 常熟市谷雷特机械产品设计有限公司 | Manufacture method of composite pipeline used for building |
| CN102635739B (en) * | 2012-02-07 | 2013-08-07 | 常熟市谷雷特机械产品设计有限公司 | Manufacture method of composite pipeline used for building |
| CN108688047A (en) * | 2018-05-10 | 2018-10-23 | 朱连成 | Manufacture craft, daily necessities, pillow, pillow and the back cushion of daily necessities |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20090218 |