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Three-dimensional numerical simulation for plastic injection-compression molding

Yun ZHANG, Wenjie YU, Junjie LIANG, Jianlin LANG, Dequn LI

Frontiers of Mechanical Engineering 2018, Volume 13, Issue 1,   Pages 74-84 doi: 10.1007/s11465-018-0490-1

Abstract:

Compared with conventional injection molding, injection-compression molding can mold optical partsmelt flow process in a closed cavity becomes more complex because of the moving cavity boundary during compressionIn this study, a 3D simulation method was developed for injection-compression molding.molding.molding.

Keywords： injection-compression molding     simulation     injection molding     melt flow     cavity pressure    

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density measurement for plastic injection molding via ultrasonic technology

Frontiers of Mechanical Engineering 2022, Volume 17, Issue 4, doi: 10.1007/s11465-022-0714-2

Abstract: Density variation during the injection molding process directly reflects the state of plastic melt andExperiments with different process conditions are conducted, including different melt temperature, injectioni> measurement, non-destructive, high accuracy, low cost, and is of great application value for the injectionmolding industry.

Keywords： ultrasonic measurement     melt density     in-situ measurement     injection molding    

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Microcellular injection molding process for producing lightweight thermoplastic polyurethane with customizable

Thomas ELLINGHAM, Hrishikesh KHARBAS, Mihai MANITIU, Guenter SCHOLZ, Lih-Sheng TURNG

Frontiers of Mechanical Engineering 2018, Volume 13, Issue 1,   Pages 96-106 doi: 10.1007/s11465-018-0498-6

Abstract:

A three-stage molding process involving microcellular injection molding with core retraction and anfoams of varying local densities, microstructures, and mechanical properties in the same microcellular injection

Keywords： thermoplastic polyurethane     microcellular injection molding     cavity expansion     compressive strength     hysteresis    

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Micro-optical fabrication by ultraprecision diamond machining and precision molding

Hui LI, Likai LI, Neil J. NAPLES, Jeffrey W. ROBLEE, Allen Y. YI

Frontiers of Mechanical Engineering 2017, Volume 12, Issue 2,   Pages 181-192 doi: 10.1007/s11465-017-0444-z

Abstract: using ultraprecision single point diamond machining followed by high volume production methods such as compressionor injection molding.For consumers, compression molding or injection molding provide efficient and high quality optics atmachine design and machining processes such as slow tool and fast too servo are described then both compressionmolding and injection molding of polymer optics are discussed.

Keywords： ultraprecision machining     slow tool servo     fast tool servo     compression molding     injection molding     microlens    

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Pressure in Gas-assisted Injection Molding

Ou Changjin

Strategic Study of CAE 2007, Volume 9, Issue 5,   Pages 27-32

Abstract: nbsp;an effective control method and strategy based on fuzzy neural network has been developed for gas injectionpressure accurate control in gas-assisted injection.

Keywords： gas-assisted injection molding     fuzzy neural network     gas-injection pressure control    

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Numerical study of ignition mechanism of n-heptane direct injection compression-ignition engine

Xiaoping GUO, Zhanjie WANG,

Frontiers in Energy 2009, Volume 3, Issue 4,   Pages 432-439 doi: 10.1007/s11708-009-0050-9

Abstract: A detailed chemical dynamical mechanism of oxidation of n-heptane was implemented into kiva-3 code to study the ignition mechanism of a high-temperature, high-pressure, three-dimensional-space, transient turbulent, non-homogeneous, mono-component fuel in the engine. By testing the quantity of the heat released by the chemical reaction within the cylinder cell, the elementary reaction showing an obvious increase in the cell temperature was defined as ignition reaction and the corresponding cell as ignition position. The main pathway of the ignition reaction was studied by using the reverse deducing method. The result shows that the ignition in the engine can be divided into low-temperature ignition and high-temperature ignition, both of which follow the same rule in releasing heat, called the impulse heat releasing feature. Low-temperature ignition reaction, whose ignition reaction is c5h9o1-4=ch3cho+c3h5-a, follows the oxidation mechanism, while high-temperature ignition reaction, whose ignition reaction is c2h3o1-2=ch3co, follows the decomposition mechanism. No matter which ignition it is in, the chemical reaction that restrains the ignition reaction from lasting is the deoxidization reaction of alkylperoxy radicals.

Keywords： compression-ignition engine     ignition mechanism     elementary reaction     n-heptane    

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Intelligent methods for the process parameter determination of plastic injection molding

Huang GAO, Yun ZHANG, Xundao ZHOU, Dequn LI

Frontiers of Mechanical Engineering 2018, Volume 13, Issue 1,   Pages 85-95 doi: 10.1007/s11465-018-0491-0

Abstract:

Injection molding is one of the most widely used material processing methods in producing plasticstudies and developments of the intelligent methods applied in the process parameter determination of injectionmolding.

Keywords： injection molding     intelligent methods     process parameters     optimization    

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Control of homogeneous charge compression ignition combustion in a two-cylinder gasoline direct injection

WANG Zhi, WANG Jianxin, SHUAI Shijin, MA Qingjun, TIAN Guohong

Frontiers in Energy 2007, Volume 1, Issue 3,   Pages 311-315 doi: 10.1007/s11708-007-0045-3

Abstract: Homogeneous charge compression ignition (HCCI) has challenges in ignition timing control, combustionIn this paper, HCCI combustion was studied in a two-cylinder gasoline direct injection (GDI) engine withA two-stage gasoline direct injection strategy combined with negative valve overlap was used to control

Keywords： Homogeneous     control     combustion     consumption     extension    

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Trends of process parameters impact on forming quality of part during the gas-assisted injection molding

Qiu Shuijin,Jiang Shaofei,Chai Guozhong,Lu Congda

Strategic Study of CAE 2009, Volume 11, Issue 4,   Pages 84-90

Abstract: paper investigates process optimization for the specific rib with section s-3 during the gas-assisted injectionmolding firstly, which is to get relationship between process parameters and quality evaluations,based

Keywords： gas-assisted injection molding     rib     Taguchi experiment design    

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methodology for regulating fuel stratification and improving fuel economy of GCI mode via double main-injection

Frontiers in Energy 2023, Volume 17, Issue 5,   Pages 678-691 doi: 10.1007/s11708-022-0859-z

Abstract: Gasoline compression ignition (GCI) combustion faces problems such as high maximum pressure rise rateregulating concentration stratification and promoting fuel-gas mixing by utilizing the double main-injectionHigh-load experiments were conducted using the DMI strategy and compared with the single main-injectionAt a 10 bar indicated mean effective pressure, increasing the main-injection-2 ratio (Rm-2) shortens the injection duration and increases the mean mixing time.

Keywords： gasoline compression ignition     injection strategy     fuel stratification     high efficiency     high load    

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Improvement of engine performance with high compression ratio based on knock suppression using Millercycle with boost pressure and split injection

Haiqiao WEI, Jie YU, Lei ZHOU

Frontiers in Energy 2019, Volume 13, Issue 4,   Pages 691-706 doi: 10.1007/s11708-019-0621-3

Abstract: In theory, high compression ratio has the potential to improve the thermal efficiency and promote theHowever, the application of high compression ratio is substantially limited by the knock in practicalThe objective of this work is to comprehensively investigate the application of high compression ratioon a gasoline engine based on the Miller cycle with boost pressure and split injection.fuel consumption of CR12 at full load could be achieved by using the strong Miller cycle and split injection

Keywords： high compression ratio     knock     Miller cycle     split injection     engine performance    

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Injection Strategy in Natural Gas-Diesel Dual-Fuel Premixed Charge Compression Ignition Combustion under Article

Hyunwook Park, Euijoon Shim, Choongsik Bae

Engineering 2019, Volume 5, Issue 3,   Pages 548-557 doi: 10.1016/j.eng.2019.03.005

Abstract:

Dual-fuel premixed charge compression ignition (DF-PCCI) combustion has been proven to be a viablealternative to conventional diesel combustion in heavy-duty compression ignition engines due to itsIn this study, an injection strategy of fuel supply (NG and diesel) in a DF-PCCI engine was investigatedA double injection strategy of diesel was implemented to adjust the local reactivity of the mixture.The combination of an NG substitution of 40%, the double injection strategy of diesel, and a moderate

Keywords： Reactivity controlled compression ignition     Premixed charge compression ignition     Natural gas     Injection    

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Characteristics and energy distribution of modulated multi-pulse injection modes based diesel HCCI combustion

LIU Bin, SU Wanhua, WANG Hui, HUANG Haozhong

Frontiers in Energy 2007, Volume 1, Issue 4,   Pages 420-427 doi: 10.1007/s11708-007-0061-7

Abstract: fuel energy distribution and combustion characteristics of early in-cylinder diesel homogenous charge compressionignition (HCCI) combustion organized by modulated multi-pulse injection modes are studied by the engine

Keywords： combustion     compression     homogenous     in-cylinder     modulated multi-pulse    

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Performance and emission characteristics of QHCCI dimethyl ether engine

WANG Ying, LI Wei, ZHOU Longbao, LIU Shenghua, HU Tiegang

Frontiers in Energy 2008, Volume 2, Issue 4,   Pages 401-405 doi: 10.1007/s11708-008-0075-5

Abstract: different pilot amounts of dimethyl ether (DME) on the performance and emission of a single-cylinder direct-injectionshow that a DME engine can operate at a wider range of speeds and loads at quasi-homogenous charge compression

Keywords： Experimental investigation     single-cylinder direct-injection     exhaust temperature     dimethyl     compression    

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Review of small aspheric glass lens molding technologies

Shaohui YIN,Hongpeng JIA,Guanhua ZHANG,Fengjun CHEN,Kejun ZHU

Frontiers of Mechanical Engineering 2017, Volume 12, Issue 1,   Pages 66-76 doi: 10.1007/s11465-017-0417-2

Abstract: As an advanced manufacturing technology, the glass lens molding process has been recognized as a low-costprofile deviation of the glass lens are greatly affected by various key technologies for glass lens molding, including glass and mold-die material forming, mold-die machining, and lens molding.These key technical factors, which affect the quality of the glass lens molding process, are systematicallytechnical bottlenecks and problems, as well as to predict the potential applicability of glass lens molding

Keywords： aspheric glass lens     mold-die manufacturing     lens molding     molding process simulation    

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Title Author Date Type Operation

Three-dimensional numerical simulation for plastic injection-compression molding

Yun ZHANG, Wenjie YU, Junjie LIANG, Jianlin LANG, Dequn LI

Journal Article

density measurement for plastic injection molding via ultrasonic technology

Journal Article

Microcellular injection molding process for producing lightweight thermoplastic polyurethane with customizable

Thomas ELLINGHAM, Hrishikesh KHARBAS, Mihai MANITIU, Guenter SCHOLZ, Lih-Sheng TURNG

Journal Article

Micro-optical fabrication by ultraprecision diamond machining and precision molding

Hui LI, Likai LI, Neil J. NAPLES, Jeffrey W. ROBLEE, Allen Y. YI

Journal Article

Pressure in Gas-assisted Injection Molding

Ou Changjin

Journal Article

Numerical study of ignition mechanism of n-heptane direct injection compression-ignition engine

Xiaoping GUO, Zhanjie WANG,

Journal Article

Intelligent methods for the process parameter determination of plastic injection molding

Huang GAO, Yun ZHANG, Xundao ZHOU, Dequn LI

Journal Article

Control of homogeneous charge compression ignition combustion in a two-cylinder gasoline direct injection

WANG Zhi, WANG Jianxin, SHUAI Shijin, MA Qingjun, TIAN Guohong

Journal Article

Trends of process parameters impact on forming quality of part during the gas-assisted injection molding

Qiu Shuijin,Jiang Shaofei,Chai Guozhong,Lu Congda

Journal Article

methodology for regulating fuel stratification and improving fuel economy of GCI mode via double main-injection

Journal Article

Improvement of engine performance with high compression ratio based on knock suppression using Millercycle with boost pressure and split injection

Haiqiao WEI, Jie YU, Lei ZHOU

Journal Article

Injection Strategy in Natural Gas-Diesel Dual-Fuel Premixed Charge Compression Ignition Combustion under

Hyunwook Park, Euijoon Shim, Choongsik Bae

Journal Article

Characteristics and energy distribution of modulated multi-pulse injection modes based diesel HCCI combustion

LIU Bin, SU Wanhua, WANG Hui, HUANG Haozhong

Journal Article

Performance and emission characteristics of QHCCI dimethyl ether engine

WANG Ying, LI Wei, ZHOU Longbao, LIU Shenghua, HU Tiegang

Journal Article

Review of small aspheric glass lens molding technologies

Shaohui YIN,Hongpeng JIA,Guanhua ZHANG,Fengjun CHEN,Kejun ZHU

Journal Article