CN104626495B - Injection molding production method of transparent product with thick-walled curved surface structure - Google Patents
Injection molding production method of transparent product with thick-walled curved surface structure Download PDFInfo
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Abstract
The invention relates to an injection molding production method of a transparent product with a thick-walled curved surface structure, and in particular relates to an injection molding production method of a transparent plastic product with a complex curved surface, high surface quality requirement and good optical property. According to the injection molding production method provided by the invention, a sprue with a slit expansion type structure and a continuous stepwise variation thickness is adopted, so that the problems of a jetting phenomenon of melt filled for molding a thick-walled product and incomplete filling and insufficient injection caused by premature cooling of the sprue are avoided. The melt filling resistance can be effectively reduced by expansion of a mould cavity and low-speed injection, so that the orientation of molecular chains of materials and the flow-induced residual stress of the product are reduced, and the buckling deformation and optical defects caused by the stress are reduced. Compression action subjected to equal pressure control is achieved on the whole molded surface of the mould cavity, a role in compensating cooling shrinkage of the product can be played, so that the residual stress caused by pressure maintaining of a screw rod is reduced, the size precision of a geometric shape is guaranteed, and the high-precision production and molding of the product can be achieved.
Description
Technical field
The present invention relates to a kind of injection moulding manufacture method of heavy wall curved surface transparent products, especially it is a kind of it is complex-curved,
Great surface quality requires the injection moulding manufacture method with the transparent plastic product of favorable optical performance.
Background technology
Substantial amounts of transparent products can be all applied in fields such as Aero-Space, auto industry and marine vessels, wherein seeing
Survey and illuminator is higher to the performance requirement of transparent products, while the profile of product is also extremely complex.Curved profile, big thickness
Geometry and high optical property, it is desirable to surface quality is good, printing opacity, little light distortion, bubble-free and gas trace, residual stress
Low, three-dimensional dimension high precision, meanwhile, it is actually used in also require the shock resistance of product and pressure functional, it is all these all
Requirements at the higher level are proposed to material and moulding manufacture method.Transparent polycarbonate material has good impact resistance, is expected to
It is applied to the fields such as observation window and illuminator.Injection moulding is a kind of near-net-shape technology, goes for contour structures and answers
The manufacture of miscellaneous product, also apply be applicable to the molding of the optical clear products such as light guide plate, optical glass and overall face-port.Due to
Merlon easily absorbs water, stress sensitive, not damage resistant, and the difference on product wall thickness and size can also cause vacuum bubbles, shrink
The defects such as warpage, the performance and the installation in later stage for badly influencing product is on active service, substantially difficult using traditional injection moulding method
To realize the molding of heavy wall precision optics product, it is impossible to meet the demand of user.German IKV employ multi-cavity injection molding and
The method of regular injection compression forming, has successfully prepared heavy wall transparent products, but size is less, and outside substantially planar geometry
Shape, is not directed to curved-surface structure.The injection moulding method of exploitation heavy wall curved surface structured transparent product is explored, is special construction Transparent Parts
Using important prerequisite.
The content of the invention
It is an object of the invention to provide a kind of injection moulding manufacture method of heavy wall precision transparent products, saturating to solve heavy wall
Bright product size is less, the Transparent Parts manufacturing issue that curved-surface structure is difficult to.
The technical scheme is that：
A kind of injection moulding manufacture method of the transparent products of heavy wall curved-surface structure is comprised the following steps：(1) Injection moulded part
Gate shape using thickness continuously graded change slit expanding structure, wherein the minimum thickness of cast gate be product thickness
2/3, less than 2 times of product thickness, the length of cast gate is 30-50mm to maximum gauge, and injecting glue point is located at that to be bordering on cast gate maximum thick
Degree side；(2) sealing is ejected using dynamic model side cylinder, is retreated by moving platen and realize that mold cavity expands, mold temperature rises to
Product material glass temperature Tg10 DEG C of the above, injection at low velocity filling, maximum injection speed is the 40% of regular injection molding, leads to
Adjustment injection device is crossed, the 102-108% that injection volume is regular injection molding is made；(3) the screw rod dwell pressure after sand off
For the 105%-120% of injection pressure maximum, the dwell time is 0.2s；(4) pressurize terminates rear injecting glue point closing；(5) pressurize
Simultaneously or after end, moving platen compression starts, and extruding melt is full of whole die cavity, and using stagewise control compression stress, the upper limit is
The maximum clamp force of equipment；The logical rapid cooling down of cold water of rear mold, cool time is 90-150s；Extruding lasts till cooling
Terminate；(6) product cooling ejection device.
The heavy wall curved surface transparent products include domed region, hither plane region and peripheral edge margin.
The useful effect region of compressed action is domed region.
The type face of injection mold carries out sectional type compensation according to domed region and hither plane region, and wherein offset is closely put down
Face region>Domed region, realizes the monnolithic case control of product.
After the product demoulding, product is inserted in psychrolusia and is further shaped.
Beneficial effects of the present invention：
1. the slit expanding structure cast gate of thickness continuously graded change can effectively prevent cold burden from entering mold cavity,
The melt filling flowing is caused gently to develop into laminar flow simultaneously, it is to avoid the melt jet phenomenon and cast gate of thick-wall part molding filling
The problems such as cooling down the scarce material for causing too early and short.
2. mold cavity expands and injection at low velocity can effectively reduce melt filling resistance, reduces taking for material molecule chain
To the flowing residual stress with product, the buckling deformation caused by stress and optical defect are reduced.
3. compressed action such as realizes at the Stress control in whole cavity mold surface, serves the work of compensation product cooling meat
With, reduce the residual stress that screw rod pressurize causes, it is ensured that the dimensional accuracy of geometric shape, it is capable of achieving the high-accuracy system of product
Cause type.
4. the stage change of mold temperature and equipment clamp force, effectively reduces the border oriented layer thickness of product and residual
Residue stress, it is ensured that the shape and size precision and surface quality of product, it is to avoid the appearance of bubbles of vacuum.
5. the subregion domain compensation of die curve is carried out, the precise control of transparent products curved-surface structure size is realized, with reference to
Other technologies, solve a series of problems, such as low heavy wall curved surface structured transparent product light transmittance, big mist degree and light distortion bigger than normal；
6. the gate design that the present invention is adopted is laid a good foundation for the injection moulding of other thick-wall parts, can be in related product
Promotion and application are carried out on product.
Description of the drawings：
Fig. 1 is the mould gate design diagram of the present invention
Fig. 2 is the product design structural representation of the present invention
Fig. 3 is the schematic diagram that a molding cycle inner mold temperature of the invention and clamp force are developed
Fig. 4 is the die face compensation distribution schematic diagram of surface compression
Mark in Fig. 1：1- notes are poured a little
Specific implementation method：
To better illustrate the object, technical solutions and advantages of the present invention, below in conjunction with the drawings and specific embodiments pair
The present invention is described further.
Injection moulding manufacture method is comprised the following steps：(1) gate shape of Injection moulded part adopts thickness continuously graded
The slit expanding structure of change, the wherein minimum thickness of cast gate are the 2/3 of product thickness, and maximum gauge is less than product thickness
2 times, the length of cast gate is 30-50mm, and injecting glue point 1 is located at and is bordering on cast gate maximum gauge side；(2) using dynamic model side cylinder top
Go out sealing, retreated by moving platen and realize that mold cavity expands, mold temperature rises to product material glass temperature TgThe above 10
DEG C, injection at low velocity filling, maximum injection speed is the 40% of regular injection molding, by adjusting injection device, makes the injection volume be
The 102-108% of regular injection molding；(3) the screw rod dwell pressure after sand off is the 105%- of injection pressure maximum
120%, the dwell time is 0.2s；(4) pressurize terminates rear injecting glue point 1 and closes；(5) simultaneously or after end, moving platen compresses for pressurize
Start, extruding melt is full of whole die cavity, compression stress is controlled using stagewise, the upper limit is the maximum clamp force of equipment；Rear mold
The tool rapid cooling down of logical cold water, cool time is 90-150s；Extruding lasts till that cooling terminates；(6) product cooling ejection is de-
Mould.
Embodiment
The thickness of Injection moulded part is 10mm, and the profile of Injection moulded part is as shown in Figure 2；
(1) cast gate of Injection moulded part is located at marginal area, and its shape is expanded using the slit of thickness continuously graded change
Formula structure, as shown in Figure 1, injecting glue point 1 is located at and is bordering on cast gate maximum gauge side, and cast gate maximum gauge is 20mm, and cast gate is most
Little thickness is 7mm, and cast gate length is 50mm；(2) dynamic model side cylinder ejection sealing, is retreated by moving platen and expands mold cavity extremely
Die joint gap is 5mm, and mold temperature rises to 160 DEG C, and using screw rod the multistage note of low speed of 5mm/s-10mm/s-20mm/s is advanced
Filling is penetrated, by adjusting the parameter such as screw back pressure and screw stroke, injection volume is made for the 108% of regular injection molding；(3) fill
The screw rod dwell pressure filled out after terminating is the 105%-120% of injection pressure maximum, and the dwell time is 0.2s；(4) pressurize knot
Injecting glue point 1 is closed after beam；(5) simultaneously or after end, moving platen compression starts for pressurize, and extruding melt is full of whole die cavity, and mends
Repay contraction, compression stress (i.e. clamp force) using segment increasing to maximum compression, the rear mold rapid cooling down of logical cold water, it is cold
But the time is 120s；Extruding lasts till that cooling terminates, as shown in Figure 3；(6) after product cooling ejection device, product is inserted
Further shaped in psychrolusia.Because compression is different to the impact effect of curved surface zones of different molding, correspondence mould is different
The design compensation value in region has differences, so, design is compensated using two regions for the mould in the present invention, divide such as
Shown in accompanying drawing 4, region 1 is domed region, and offset is 0.2mm, and region 2 is hither plane region, and offset is 0.5mm.
Claims (5)
1. a kind of injection moulding manufacture method of the transparent products of heavy wall curved-surface structure, it is characterised in that injection moulding manufacturer
Method is comprised the following steps：(1) the slit expanding structure that the gate shape of Injection moulded part is changed using thickness continuously graded, its
The minimum thickness of middle cast gate is the 2/3 of product thickness, maximum gauge less than 2 times of product thickness, the length of cast gate is 30-
50mm, injecting glue point is located at and is bordering on cast gate maximum gauge side；(2) sealing is ejected using dynamic model side cylinder, is retreated by moving platen
Realize that mold cavity expands, mold temperature rises to product material glass temperature Tg10 DEG C of the above, injection at low velocity filling, maximum note
Firing rate degree is the 40% of regular injection molding, by adjusting injection device, makes the 102- that injection volume is regular injection molding
108%；(3) the screw rod dwell pressure after sand off for injection pressure maximum 105%-120%, the dwell time is
0.2s；(4) pressurize terminates rear injecting glue point closing；(5) simultaneously or after end, moving platen compression starts for pressurize, and extruding melt is full of
Whole die cavity, using stagewise compression stress is controlled, and the upper limit is the maximum clamp force of equipment；The logical cold water of rear mold lower the temperature rapidly it is cold
But, cool time is 90-150s；Extruding lasts till that cooling terminates；(6) product cooling ejection device.
2. the injection moulding manufacture method of the transparent products of a kind of heavy wall curved-surface structure according to claim 1, its feature
It is：The heavy wall curved surface transparent products include domed region, hither plane region and peripheral edge margin.
3. the injection moulding manufacture method of the transparent products of a kind of heavy wall curved-surface structure according to claim 1, its feature
It is：The useful effect region of compressed action is domed region.
4. the injection moulding manufacture method of the transparent products of a kind of heavy wall curved-surface structure according to claim 1, its feature
It is：The type face of injection mold carries out sectional type compensation, wherein offset hither plane according to domed region and hither plane region
Region>Domed region, realizes the monnolithic case control of product.
5. the injection moulding manufacture method of the transparent products of a kind of heavy wall curved-surface structure according to claim 1, its feature
It is：After the product demoulding, product is inserted in psychrolusia and is further shaped.
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| CN201410768563.5A CN104626495B (en) | 2014-12-12 | 2014-12-12 | Injection molding production method of transparent product with thick-walled curved surface structure |
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| CN201410768563.5A CN104626495B (en) | 2014-12-12 | 2014-12-12 | Injection molding production method of transparent product with thick-walled curved surface structure |
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| CN104626495B true CN104626495B (en) | 2017-05-17 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106738736B (en) * | 2016-11-29 | 2019-03-29 | 延锋彼欧仪征汽车外饰***有限公司 | Bumper manufactures modification method of tracing to the source |
| CN106626297A (en) * | 2016-12-14 | 2017-05-10 | 武汉通畅汽车电子照明有限公司 | Injection molding process for eliminating shrinkage marks and shrinkage cavities of thick-wall light guide piece during manufacturing of automobile lamps |
| CN107571465B (en) * | 2017-10-17 | 2020-03-27 | 中国航发北京航空材料研究院 | Molding method for multiple injections of single melt |
| CN109895341A (en) * | 2017-12-11 | 2019-06-18 | 财团法人金属工业研究发展中心 | The mode compensation method of free surface lens |
| CN110576568A (en) * | 2019-07-01 | 2019-12-17 | 中国航发北京航空材料研究院 | Injection compression molding die and method for curvature transparent part |
| CN111361096A (en) * | 2020-04-14 | 2020-07-03 | 奕东电子科技股份有限公司 | Injection mold and injection method for improving forming internal stress of vehicle-mounted light guide plate |
| CN115122590B (en) * | 2022-07-13 | 2024-05-24 | 中国航发北京航空材料研究院 | Injection molding method for eliminating optical distortion of complex curvature transparent piece |
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| CN202114867U (en) * | 2011-06-13 | 2012-01-18 | 东莞劲胜精密组件股份有限公司 | Injection mold with insert |
| CN103496218A (en) * | 2013-10-21 | 2014-01-08 | 田艳 | Corrosion-resistance and thermal-insulation cloth |
| CN103552225A (en) * | 2013-10-28 | 2014-02-05 | 郑州大学 | Real-time detection method for internal stress distribution in transparent product injection compression molding process |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4823752B2 (en) * | 2006-04-21 | 2011-11-24 | 株式会社タイテック | Molded product take-out machine |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201538022U (en) * | 2009-10-12 | 2010-08-04 | 北京化工大学 | Device for module chamber temperature controlling and pressure maintaining process |
| CN202114867U (en) * | 2011-06-13 | 2012-01-18 | 东莞劲胜精密组件股份有限公司 | Injection mold with insert |
| CN103496218A (en) * | 2013-10-21 | 2014-01-08 | 田艳 | Corrosion-resistance and thermal-insulation cloth |
| CN103552225A (en) * | 2013-10-28 | 2014-02-05 | 郑州大学 | Real-time detection method for internal stress distribution in transparent product injection compression molding process |
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