CN104626495A - 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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- CN104626495A CN104626495A CN201410768563.5A CN201410768563A CN104626495A CN 104626495 A CN104626495 A CN 104626495A CN 201410768563 A CN201410768563 A CN 201410768563A CN 104626495 A CN104626495 A CN 104626495A
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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 a kind of complex-curved, great surface quality requires and the injection moulding manufacture method of transparent plastic product of favorable optical performance.
Background technology
All can be applied to a large amount of transparent products in fields such as Aero-Space, auto industry and marine vessel, wherein observation and the performance requirement of illuminator to transparent products higher, simultaneously the profile of product is also very complicated.The geometry of curved profile, heavy thickness and high optical property, require that surface quality is good, printing opacity, light distortion are little, bubble-free and gas trace, residual stress is low, three-dimensional dimension precision is high, simultaneously, actual use in also require the shock resistance of product and withstand voltage properties good, all these proposes requirements at the higher level to material and moulding manufacture method.Transparent polycarbonate material has good impact resistance, is expected to be applied to the field such as observation window and illuminator.Injection moulding is a kind of near-net-shape technology, goes for the manufacture of the product of contour structures complexity, also can be applicable to the shaping of the optical clear products such as light guide plate, optical mirror slip and overall face-port.Due to Merlon very easily absorb water, stress sensitive, not damage resistant, difference in product wall thickness and size also can cause vacuum bubbles, shrink the defects such as warpage, the performance and the installation in later stage that badly influence product are on active service, utilize traditional injection moulding method, substantially be difficult to realize the shaping of heavy wall precision optics product, the demand of user cannot be met.Germany IKV have employed the method for multi-cavity injection molding and regular injection compression forming, successfully prepare heavy wall transparent products, but size is less, and is plane geometry profile substantially, does not relate to curved-surface structure.Exploring the injection moulding method of exploitation heavy wall curved surface structured transparent product, is the important prerequisite of special construction Transparent Parts application.
Summary of the invention
The object of this invention is to provide the injection moulding manufacture method of the accurate transparent products of a kind of heavy wall, heavy wall transparent products size is less to solve, curved-surface structure is difficult to the Transparent Parts manufacturing issue that realizes.
Technical scheme of the present invention is:
A kind of injection moulding manufacture method of transparent products of heavy wall curved-surface structure comprises the following steps: the gate shape of (1) Injection moulded part adopts the slit expanding structure of thickness continuously graded change, wherein the minimum thickness of cast gate is 2/3 of product thickness, maximum gauge is less than 2 times of product thickness, the length of cast gate is 30-50mm, and injecting glue point is positioned at and is bordering on cast gate maximum gauge side; (2) utilize dynamic model side cylinder to eject sealing, retreated by moving platen and realize mold cavity expansion, mold temperature rises to product material glass temperature T
gabove 10 DEG C, injection at low velocity filling, maximum injection speed be regular injection shaping 40%, by adjustment injection device, make injection volume be the shaping 102-108% of regular injection; (3) the screw rod dwell pressure after sand off is the 105%-120% of injection pressure maximum, and the dwell time is 0.2s; (4) pressurize terminate rear injecting glue point close; (5) pressurize simultaneously or after terminating, moving platen compression starts, and extruding melt is full of whole die cavity, and adopt segmented to control compression stress, the upper limit is the maximum clamp force of equipment; Rear mold lead to the rapid cooling down of cold water, cool time is 90-150s; Extruding lasts till that cooling terminates; (6) product cooling ejection device.
Described heavy wall curved surface transparent products comprises domed region, hither plane region and peripheral edge margin.
The useful effect region of compressed action is domed region.
The profile of injection mold carries out sectional type compensation according to domed region and hither plane region, wherein offset hither plane region > domed region, and the monnolithic case realizing product controls.
After the product demoulding, product is inserted in cold bath and shapes further.
Beneficial effect 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, make melt filling flow simultaneously and develop into laminar flow gently, avoid the melt jet phenomenon of the shaping filling of thick-wall part and cast gate and cool the scarce material caused too early and the problem such as to short.
2. mold cavity expansion and injection at low velocity can effectively reduce melt filling resistance, reduce the orientation of material molecule chain and the flowing residual stress of product, reduce the buckling deformation caused by stress and optical defect.
3. compressed action realizes equal pressure control in whole cavity mold surface, and serve the effect compensating product cooling meat, reduce the residual stress that screw rod pressurize causes, ensure that the dimensional accuracy of geometric shape, the high-accuracy manufacture that can realize product is shaping.
4. the stage change of mold temperature and equipment clamp force, effectively reduces border oriented layer thickness and the residual stress of product, ensure that shape and size precision and the surface quality of product, avoid the appearance of bubbles of vacuum.
5. the subregion of carrying out die curve compensates, and achieves the accurate control of transparent products curved-surface structure size, in conjunction with other technologies, and the series of problems such as solve that heavy wall curved surface structured transparent product light transmittance is low, mist degree is large and light distortion is bigger than normal;
6. the gate design that the present invention adopts is that the injection moulding of other thick-wall parts is laid a good foundation, and can carry out promotion and application on Related product.
Accompanying drawing illustrates:
Fig. 1 is mould gate design diagram of the present invention
Fig. 2 is product design structural representation of the present invention
Fig. 3 is the schematic diagram that the present invention's molding cycle inner mold temperature and clamp force develop
Fig. 4 is that the die face of surface compression compensates distribution schematic diagram
Mark in Fig. 1: 1-note waters a little
Specific implementation method:
For better the object, technical solutions and advantages of the present invention being described, below in conjunction with the drawings and specific embodiments, the invention will be further described.
Injection moulding manufacture method comprises the following steps: the gate shape of (1) Injection moulded part adopts the slit expanding structure of thickness continuously graded change, wherein the minimum thickness of cast gate is 2/3 of product thickness, maximum gauge is less than 2 times of product thickness, the length of cast gate is 30-50mm, and injecting glue point 1 is positioned at and is bordering on cast gate maximum gauge side; (2) utilize dynamic model side cylinder to eject sealing, retreated by moving platen and realize mold cavity expansion, mold temperature rises to product material glass temperature T
gabove 10 DEG C, injection at low velocity filling, maximum injection speed be regular injection shaping 40%, by adjustment injection device, make injection volume be the shaping 102-108% of regular injection; (3) the screw rod dwell pressure after sand off is the 105%-120% of injection pressure maximum, and the dwell time is 0.2s; (4) pressurize terminates rear injecting glue point 1 and closes; (5) pressurize simultaneously or after terminating, moving platen compression starts, and extruding melt is full of whole die cavity, and adopt segmented to control compression stress, the upper limit is the maximum clamp force of equipment; Rear mold lead to the rapid cooling down of cold water, cool time is 90-150s; Extruding lasts till that cooling terminates; (6) product cooling ejection device.
Embodiment
The thickness of Injection moulded part is 10mm, and the profile of Injection moulded part as shown in Figure 2;
(1) cast gate of Injection moulded part is positioned at fringe region, and its shape adopts the slit expanding structure of thickness continuously graded change, as shown in Figure 1, injecting glue point 1 is positioned at and is bordering on cast gate maximum gauge side, cast gate maximum gauge is 20mm, and cast gate minimum thickness is 7mm, and cast gate length is 50mm; (2) dynamic model side cylinder ejects sealing, retreating expansion mold cavity to die joint gap by moving platen is 5mm, mold temperature rises to 160 DEG C, screw rod is adopted to advance the multistage injection molding process of low speed of 5mm/s-10mm/s-20mm/s, by the adjustment parameter such as screw back pressure and screw stroke, make injection volume be regular injection shaping 108%; (3) the screw rod dwell pressure after sand off is the 105%-120% of injection pressure maximum, and the dwell time is 0.2s; (4) pressurize terminates rear injecting glue point 1 and closes; (5) pressurize simultaneously or after terminating, moving platen compression starts, and extruding melt is full of whole die cavity, and compensate for shrinkage, compression stress (i.e. clamp force) adopts segment increasing to maximum compression, rear mold lead to the rapid cooling down of cold water, cool time is 120s; Extruding lasts till that cooling terminates, as shown in Figure 3; (6), after product cooling ejection device, product is inserted in cold bath and shapes further.Because compression is different to the impact effect that curved surface zones of different is shaping, the design compensation value of corresponding mould zones of different there are differences, so, two regions are adopted to compensate design for the mould in the present invention, divide as shown in Figure 4, region 1 is domed region, and offset is 0.2mm, region 2 is hither plane region, and offset is 0.5mm.
Claims (5)
1. the injection moulding manufacture method of the transparent products of a heavy wall curved-surface structure, it is characterized in that, injection moulding manufacture method comprises the following steps: the gate shape of (1) Injection moulded part adopts the slit expanding structure of thickness continuously graded change, wherein the minimum thickness of cast gate is 2/3 of product thickness, maximum gauge is less than 2 times of product thickness, the length of cast gate is 30-50mm, and injecting glue point is positioned at and is bordering on cast gate maximum gauge side; (2) utilize dynamic model side cylinder to eject sealing, retreated by moving platen and realize mold cavity expansion, mold temperature rises to product material glass temperature T
gabove 10 DEG C, injection at low velocity filling, maximum injection speed be regular injection shaping 40%, by adjustment injection device, make injection volume be the shaping 102-108% of regular injection; (3) the screw rod dwell pressure after sand off is the 105%-120% of injection pressure maximum, and the dwell time is 0.2s; (4) pressurize terminate rear injecting glue point close; (5) pressurize simultaneously or after terminating, moving platen compression starts, and extruding melt is full of whole die cavity, and adopt segmented to control compression stress, the upper limit is the maximum clamp force of equipment; Rear mold lead to the rapid cooling down of cold water, 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, is characterized in that: described heavy wall curved surface transparent products comprises 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, is characterized in that: 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, it is characterized in that: the profile of injection mold carries out sectional type compensation according to domed region and hither plane region, wherein offset hither plane region > domed region, the monnolithic case realizing product controls.
5. the injection moulding manufacture method of the transparent products of a kind of heavy wall curved-surface structure according to claim 1, is characterized in that: after the product demoulding, is inserted in cold bath by product and shape further.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN106738736A (en) * | 2016-11-29 | 2017-05-31 | 延锋彼欧仪征汽车外饰系统有限公司 | Bumper manufactures modification method of tracing to the source |
| CN107571465A (en) * | 2017-10-17 | 2018-01-12 | 中国航发北京航空材料研究院 | A kind of forming method of single melt multiple injection |
| 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 |
| CN115122590A (en) * | 2022-07-13 | 2022-09-30 | 中国航发北京航空材料研究院 | Injection molding method for eliminating optical distortion of complex-curvature transparent part |
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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 |
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| JP2007290154A (en) * | 2006-04-21 | 2007-11-08 | Tietech Co Ltd | Molded product ejector |
| 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 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106738736A (en) * | 2016-11-29 | 2017-05-31 | 延锋彼欧仪征汽车外饰系统有限公司 | Bumper manufactures modification method of tracing to the source |
| CN106738736B (en) * | 2016-11-29 | 2019-03-29 | 延锋彼欧仪征汽车外饰系统有限公司 | 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 |
| CN107571465A (en) * | 2017-10-17 | 2018-01-12 | 中国航发北京航空材料研究院 | A kind of forming method of single melt multiple injection |
| 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 |
| CN115122590A (en) * | 2022-07-13 | 2022-09-30 | 中国航发北京航空材料研究院 | Injection molding method for eliminating optical distortion of complex-curvature transparent part |
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