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International Journal of Minerals,Metallurgy and Materials 2022年第9期29卷 1770-1779页

作者： Yaoxiang Geng Hao Tang Junhua Xu Yu Hou Yuxin Wang Zhen He Zhijie Zhang Hongbo Ju Lihua Yu School of Materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China

Many studies have investigated the selective laser melting(SLM)of AlSi10Mg and AlSi7Mg alloys,but there are still lack of researches focused on Al-Si-Mg alloys specifically tailored for *** this work,a novel high Mg-content AlSi8Mg3 alloy was specifically designed for *** results showed that this new alloy exhibited excellent SLM processability with a lowest porosity of 0.07%.Massive lattice distortion led to a high Vickers hardness in samples fabricated at a high laser power due to the precipitation of Mg_(2)Si nanoparticles from theα-Al matrix induced by high-intensity intrinsic heat treatment during *** maximum microhardness and compressive yield strength of the alloy reached HV(211±4)and(526±12)MPa,*** aging treatment at 150℃,the maximum microhardness and compressive yield strength of the samples were further improved to HV(221±4)and(577±5)MPa,*** values are higher than those of most known aluminum alloys fabricated by *** paper provides a new idea for optimizing the mechanical properties of Al-Si-Mg alloys fabricated using SLM.

关键词： AlSi8Mg3 alloy selective laser melting process parameters microstructure aging treatment mechanical properties

Optimizing mechanical properties of HIPS fabricated with low-cost desktop 3D printers:investigating the impact of process parameters

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Advances in Manufacturing 2024年第2期12卷 379-395页

作者： Jin-Ting Xu Guang-Wei Zhang Man-Man Chen School of Automotive Engineering Dalian University of TechnologyDalian116024People’s Republic of China

Recently,low-cost desktop three-dimensional(3D)printers,employing the fused deposition modeling(FDM)technique,have gained widespread ***,most users cannot test the strength of printed parts,and little information is available about the mechanical properties of printed high-impact polystyrene(HIPS)parts using desktop 3D *** this study,the user-adjustable parameters of desktop 3D printers,such as crisscross raster orientation,layer thickness,and infill density,were *** experimental plans were designed using the Box-Behnken method,and tensile,3-point bending,and compression tests were carried out to determine the mechanical responses of the printed *** prediction models of the process parameters were regressed to produce the optimal combination of process *** experimental results showcase that the crisscross raster orientation has significant effects on the flexural and compression strengths,but not on the tensile *** an increase in the layer thickness,the tensile,flexural,and compression strengths first decreased and then increased,reaching their minimum values at approximately 0.16 mm layer *** addition,they all increased with an increase of infill *** was demonstrated that when the raster orientation,layer thickness,and infill density were 13.08°/–76.92°,0.09 mm,and 80%,respectively,the comprehensive mechanical properties of the printed HIPS were *** results can help end-users of desktop 3D printers understand the effects of process parameters on the mechanical properties,and offer practical suggestions for setting proper printing parameters for fabricating HIPS parts.

关键词： Desktop three-dimensional(3D)printers Fused deposition modeling(FDM) High-impact polystyrene(HIPS) process parameters

Improvement of titanium alloy TA19 fatigue life by submerged abrasive waterjet peening:Correlation of its process parameters with surface integrity and fatigue performance

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Chinese Journal of Aeronautics 2024年第1期37卷 377-390页

作者： Gongyu WANG Shulei YAO Yuxin CHI Chengcheng ZHANG Ning WANG Yalong CHEN Rongsheng LU Zhuang LI Xiancheng ZHANG Key Laboratory of Pressure Systems and Safety Ministry of EducationSchool of Mechanical and Power EngineeringEast China University of Science and TechnologyShanghai 200237China AECC Commercial Aircraft Engine Co.LTD Shanghai Engineering Research Center for Commercial Aircraft EngineShanghai 201108China

Submerged abrasive waterjet peening(SAWJP)is an effective anti-fatigue manufacturing technology that is widely used to strengthen aeroengine *** study investigated the correlation of SAWJP process parameters on surface integrity and fatigue life of titanium alloy *** with different water pressures and standoff distances(SoDs)was conducted on the TA19 *** surface integrity of the specimens before and after SAWJP with different process parameters was experimentally studied,including microstructure,surface roughness,microhardness,and compressive residual stress(CRS).Finally,fatigue tests of the specimens before and after SAWJP treatment with different process parameters were carried out at room *** results highlighted that the fatigue life of the TA19 specimen can be increased by 5.46,5.98,and 6.28 times under relatively optimal process parameters,which is mainly due to the improved surface integrity of the specimen after SAWJP ***,the fatigue life of specimens treated with improper process parameters is decreased by 0.55 to 0.69 times owing to the terrible surface roughness caused by the material *** work verifies that SAWJP can effectively improve the surface integrity and fatigue life of workpieces,and reveals the relationship between process parameters,surface integrity,and fatigue life,which provides support for the promotion of SAWJP in the manufacturing fields.

关键词： Fatigue testing process parameters Submerged abrasive waterjet peening Surface integrity Surface treatment Titanium alloy TA19

Automated process parameters tuning for an injection moulding machine with soft computing

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2011年第3期12卷 201-206页

作者： Peng ZHAO Jian-zhong FU Hua-min ZHOU Shu-biao CUI State Key Laboratory of Fluid Power Transmission and Control Zhejiang University Hangzhou 310027 China State Key Laboratory of Material processing and Die & Mould Technology Huazhong University of Science and Technology Wuhan 430074 China

In injection moulding production,the tuning of the process parameters is a challenging job,which relies heavily on the experience of skilled *** this paper,taking into consideration operator assessment during moulding trials,a novel intelligent model for automated tuning of process parameters is *** consists of case based reasoning (CBR),empirical model (EM),and fuzzy logic (FL) *** and EM are used to imitate recall and intuitive thoughts of skilled operators,respectively,while FL is adopted to simulate the skilled operator optimization ***,CBR is used to set up the initial process *** CBR fails,EM is employed to calculate the initial ***,a moulding trial is performed using the initial *** FL is adopted to optimize these parameters and correct defects repeatedly until the moulded part is found to be *** on the above methodologies,intelligent software was developed and embedded in the controller of an injection moulding *** results show that the intelligent software can be effectively used in practical production,and it greatly reduces the dependence on the experience of the operators.

关键词： Injection moulding machine (IMM) process parameters Case based reasoning (CBR) Empirical model (EM) Fuzzy logic (FL)

Effects of process parameters on nonaqueous gelcasting for copper powder

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International Journal of Minerals,Metallurgy and Materials 2016年第5期23卷 542-547页

作者： Karima Bekouche Zhao-li Wang Cheng-Chang Jia Bo-wen Liu Yi Tang Institute of Advanced Materials and Technology University of Science and Technology Beijing

An approach to fabricate sintered copper with high green strength and high sintered density using nonaqueous gelcasting technol- ogy is presented in this study. The effects of various gelcasting processing parameters such as monomer content, monomer/crosslinker ratio, initiator content, dispersant dosage, and temperature on the flexural strength of dried green bodies and the relative density of sintered bodies were studied to obtain better microstructures and properties. The appropriate process parameters obtained for copper gelcasting are as follows monomer content, 20vol%-30vol% （based on the total volume of reagents）; monomer/crosslinker ratio, 10：1 to 20：1; initiator content, 3vol%-4vol% （based on the volume of the monomer）; dispersant dosage, 1.5wt%-2.5wt% （based on the mass of the copper powder）; and reaction temperature, 65-75℃.

关键词： copper powder gelcasting monomer process parameters flexural strength density

Effect of process parameters on Morphology and Grain Refinement Efficiency of TiAl_3 and TiB_2 in Alumimum Casting

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Journal of Materials Science & Technology 2008年第1期24卷 54-56页

作者： Prapas Kunnam Chaowalit Limmaneevichitr National Metal and Materials Technology Center Thailand Science Park Klong 1Klong LuangPathumthani12120 Thailand Production Engineering Department Faculty of Engineering King Mongkut's University of Technology ThonburiBangmodTungkhruBangkok10140 Thailand

This paper presents the effects of different process parameters in producing Al-STi-1B grain refiner,*** sequences and reaction time,on grain refinement efficiency of aluminum *** was found that different process parameters resulted in different morphology and size distribution of TiAl-3 and TiB-2 in grain refiner. The experiment was carried out by adding KBF-4 and K-2TiF-6 to molten *** melting temperature was controlled at 800℃in an electric resistance *** different sequences of KBF-4 and K-2TiF-6 additions were applied,i.e.,adding KBF-4 before K-2TiF-6,adding K-2TiF-4 before KBF-4 and mixing both KBF-4 and K-2TiF-6 before adding to molten *** different holding time at 1 min,30 min and 60 min were *** results showed that no significant difference of morphology and size distribution was found by varying three different ***,the different holding time provided major differences in both morphology and size distribution,which are technically expectable from diffusion and agglomeration between particles resulting in larger particle size and wider range of size distribution of TiAI3 and *** the reaction time was longer than 30 rain,morphology of both TiAl-3 and TiB-2 became too *** the reaction time was too short,less reaction between TiAl-3 and TiB2 to form would be *** grain refinement efficiency, it was found that mixing KBF-4 and K-2TiF-6 before adding to molten aluminum with a holding time of 30 min resulted in best grain refinement efficiency.

关键词： Grain refinement process parameters TiAl3 TiB2 K2TiF6 KBF4

Effects of process parameters on warpage of rapid heat cycle moulding plastic part

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Journal of Central South University 2014年第8期21卷 3024-3036页

作者：刘东雷辛勇曹文华孙玲 College of Mechanical and Electrical Engineering Nanchang University National Engineering Research Center for Application Plastic processing Technology (NERC-APPT) Zhengzhou University

The effects of process parameters in rapid heat cycle moulding （RHCM） on parts warpage were investigated. A vehicle-used blue-tooth front shell （consisting of ABS material） was considered as a part example manufactured by RHCM method. The corresponding rapid heat response mould with an innovational conformal heating/cooling channel system and a dynamic mould temperature control system based on the Jll-W-160 type precise temperature controller was proposed. During heating/cooling process, the mould was able to be heated from room temperature to 160 ~C in 6 s and then cooled to 80 ~C in 22 s. The effects of processing conditions in RHCM on part warpage were investigated based on the single factor experimental method and Taguchi theory. Results reveal that the elevated mould temperature reduces unwanted freezing during the injection stage, thus improving mouldability and enhancing part quality, whereas the overheated of mould temperature will lead to defective product. The feasible mould temperature scope in RHCM should be no higher than 140 ~C, and the efficient mould temperature scope should be around the polymer heat distortion temperature. Melt temperature as well as injection pressure effects on warpage can be divided into two stages The lower stage gives a no explicit effect on warpage whereas the higher stage leads to a quasi-linear downtrend. But others affect the warpage as a V-type fluctuation, reaching to the minimum around the heat distortion temperature. Under the same mould temperature condition, the effects of process parameters on warpage decrease according to the following order, packing time, packing pressure, melt temperature, injection pressure and cooling time, respectively.

关键词： rapid heat cycle moulding plastic part process parameters warpage

Relationship between Microcellular Foaming Injection Molding process parameters and Cell Size

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Journal of Donghua University(English Edition) 2008年第3期25卷 308-313页

作者：胡广洪姜朝东崔振山 National Mold & Die CAD Engineering Research Center Shanghai Jiaotong University GE (China) Research Development Center

In order to study the relationship between the main process parameters and the cell size, the mathematical model of cell growth of microcellular foaming injection process is built. Then numeric simulation is employed as experimental method, and the Taguchi method is used to analyze significance of effect of process parameters on the cell size. At last the process parameters are focused on melt temperature, injection time, mold temperature and pretidied volume. The significance order from big to small of the effect of each process parameters on cell size is melt temperature, pre-filled volume, injection time, and mold temperature. On the basis of above research, the effect of each process parameter on cell size is further researched. Appropriate reduction of the melt temperature and increase of the pre-filled volume can optimize the cell size effectively, while the effects of injection time and mold temperature on cell size are less significant.

关键词： Microcellular foaming injection molding process parameters cell size numeric simulation Taguchi method

Effect of pulsed laser process parameters on welding quality of automobile fuel injector

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China Welding 2011年第3期20卷 75-80页

作者：崔厚学胡伦骥余圣甫 School of Material Science and Engineering Huazhong University of Science and Technology Wuhan 430074

In this research, pulverization plate and base of a fuel injector in an automobile electronic-controlled engine was joined by pulsed laser welding. The different welding parameters were evaluated and effect of process parameters on joint characteristics was analyzed. The optimal process parameters were obtained as follows： welding current 120 A, welding speed 600 ram/rain, pulse duration 1.80 ms and pulse frequency 60 Hz. The microstructure of weld metal was investigated. Results show that the fusion zone is austenitic dendrite, the weld center is equiaxed grain, while the transition zone between fusion zone and weld center is mixed crystal with austenitic dendrite and equiaxed grain. The weld layered phenomenon was observed, and eddy caused by keyhole effect is the main reason for the formation of layered structure in molten pool.

关键词： fuel injector pulsed laser welding process parameters microstructure

Effect of process parameters on weld quality by friction stir welding of 2219 aluminum alloy

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China Welding 2011年第2期20卷 12-16页

作者：杜岩峰田志杰高培涛张彦华 Beihang University Beijing 100083. Capital Aerospace Machinery Corporation Beijing 100076.

In the friction stir welding （FSW） process, welding speed and tool rotation speed are two important parameters, which have great effect on the weld quality. Because neither of each parameter can ensure the welding process effectively, an energy factor n, which is the ratio of rotation speed（to） to welding speed （v）, was selected to represent the heat generation intensity. According to this energy input factor n, the effect of heat input on the weld quality was estimated qualitatively. The results show that the optimized scope for the factor n should be within 2. 5 and 6. 0, outside of which groove defects and burr defects will appear.

关键词： friction stir welding process parameters weld formation tensile strength