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Effect of Ti on microstructure and strengthening behavior in press hardening steels

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Journal of Central South University 2017年第10期24卷 2215-2221页

作者： WEN Yu-hui ZHU Guo-ming DAI Si-yu KANG Yong-lin School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China State Key Laboratory for Advanced Metals and Materials(University of Science and Technology Beijing) Beijing 100083China

Effect of Ti addition on the microstructure and strengthening behavior in press hardening steels(PHS)was analyzed by optical metallography(OM),scanning electron microscopy(SEM),transmission electron microscopy(TEM)and X-ray diffraction(XRD).The results show that the microstructure of PHS is martensite,and two sizes of particles disperse in the martensite matrix during the forming and quenching *** size of the bigger particles is between 100 and 200 nm,and the small particles are *** quantity of the particles has a positive relation with the Ti *** importantly,the microstructure and strengthening mechanism are affected by the precipitating behavior of the *** the prior austenite grain,martensite packet,block and lath are refined by Ti *** steels are strengthened by the fine grains,martensite substructure and *** uniformly distributed dislocation in the martensite lath,the density of which is between 3.0?10^(14) cm^(–2) and 5.0?10^(14) cm^(–2),strengthens the steels through associating with fine carbide particles.

关键词： martensite particles prior austenite grain martensite lath press hardening steel

Study of utilizing differential gear train to achieve hybrid mechanism of mechanical press

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Science China(Technological Sciences) 2007年第1期50卷 69-80页

作者： HE YuPeng ZHAO ShengDun ZOU Jun ZHANG ZhiYuan School of Mechanical Engineering Nanjing University of Science&TechnologyNanjing 210094China School of Mechanical Engineering Xi’an Jiaotong UniversityXi’an 710049China

The problems of hybrid input of mechanical press are studied in this paper, with differential gear train as transmission mechanism. It is proposed that “adjust-able-speed amplitude” or “differential-speed ratio” is the important parameters for the hybrid input mechanism. It not only defines the amplitude of the adjustable speed, but also determines the ratio of the power of the servomotor to the power of the conventional motor. The calculating equations of the ratio of transmission in all axes, the power of two motors, and the working load distribution are deduced. The two kinds of driving schemes are put forward that the servomotor and the conven-tional motor simultaneously drive and the servomotor and the conventional motor separately drive. The calculating results demonstrate that the latter scheme can use much lower power of the servomotor, so this scheme makes manufacture and use cost much lower. The latter scheme proposes a feasible way to apply the hybrid mechanism of mechanical press in practice engineering.

关键词： mechanical press hybrid mechanism differential gear train adjustable-speed

Sugarcane press mud modification of expansive soil stabilized at optimum lime content:Strength,mineralogy and microstructural investigation

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Journal of Rock Mechanics and Geotechnical Engineering 2020年第2期12卷 395-402页

作者： Jijo James SSN College of Engineering Chennai603110India

This study attempted to investigate the potential of sugarcane press mud(PM) as a secondary additive in conjunction with lime for the stabilization of an expansive *** physico-mechanical properties of an expansive soil,such as plasticity,shrink-swell behavior,unconfined compressive strength(UCS),mineralogical and microstructural characteristics were *** expansive soil was stabilized at its optimum lime content(7%) for producing maximum strength,and was modified with four different quantities of PM in small dosages(0.25%-2%).Cylindrical soil samples,38 mm in diameter and 76 mm in height,were cast and cured for varying periods to evaluate the strength of the amended *** spent samples after strength tests were further used for determination of other *** test results revealed that PM modification led to a substantial improvement in 7-d strength and noticeable increase in 28-d strength of the lime-stabilized soil(LSS).The addition of PM does not cause any detrimental changes to the shrink-swell properties as well as plasticity nature of the stabilized soil,despite being a material of organic *** investigation revealed that the formation of calcium silicate hydrate(CSH) minerals,similar to that of pure lime stabilization with only the type of mineral varying due to the modification of PM addition,does not significantly alter the microstructure of the LSS except for superficial changes being noticed.

关键词： Expansive soil Lime stabilization press mud(PM) Strength Shrink-swell Mineralogy Microstructure

Prediction of effects of punch shapes on tableting failure by using a multi-functional single-punch tablet press

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Asian Journal of Pharmaceutical Sciences 2017年第5期12卷 412-417页

作者： Takashi Osamura Yoshiko Takeuchi Risako Onodera Masahiro Kitamura Yoshiteru Takahashi Kohei Tahara Hirofumi Takeuchi Laboratory of Pharmaceutical Engineering Gifu Pharmaceutical University1-25-4Daigaku-NishiGifu501-1196Japan Pharmaceutical Technology Department Sawai Pharmaceutical Co.Ltd12-34HiroshibachoSuita-ShiOsaka564-0052Japan

We previously determined 'Tableting properties' by using a multi-functional single-punch tablet press(GTP-1). We proposed plotting 'Compactability' on the x-axis against'Manufacturability' on the y-axis to allow visual evaluation of 'Tableting properties'. Various types of tableting failure occur in commercial drug production and are influenced by the amount of lubricant used and the shape of the punch. We used the GTP-1 to measure'Tableting properties' with different amounts of lubricant and compared the results with those of tableting on a commercial rotary tableting machine. Tablets compressed with a small amount of lubricant showed bad 'Manufacturability', leading to sticking of powder on *** also tested various punch shapes. The GTP-1 correctly predicted the actual tableting results for all punch shapes. With punches that were more likely to cause tableting failure, our system predicted the effects of lubricant quantity in the tablet formulation and the occurrence of sticking in the rotary tableting machine.

关键词： Tableting Formulation design Lubricant Punch shape Single-punch tablet press Losartan potassium

Formulation design of granules prepared by wet granulation method using a multi-functional single-punch tablet press to avoid tableting failures

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Asian Journal of Pharmaceutical Sciences 2018年第2期13卷 113-119页

作者： Takashi Osamura Yoshiko Takeuchi Risako Onodera Masahiro Kitamura Yoshiteru Takahashi Kohei Tahara Hirofumi Takeuchi Laboratory of Pharmaceutical Engineering Gifu Pharmaceutical University Pharmaceutical Technology Department Sawai Pharmaceutical Co.Ltd

We previously determined "Tableting properties" by using a multi-functional single-punch tablet press(GTP-1). We plotted "Compactability" on the x-axis against "Manufacturability"on the y-axis to allow visual evaluation of "Tableting properties". Here, we examined whether this evaluation method can be used in the formulation design of tablets prepared by wet granulation. We used the GTP-1 to measure "Tableting properties" with different amounts of binder, disintegrant, and lubricant, and compared the results with those of tableting on a commercial rotary tableting machine. Tableting failures(capping and binding in particular) occurred when samples that had been evaluated as having poor "Compactability" or"Manufacturability" on the GTP-1 were compressed on the rotary tableting machine. Thus,our evaluation method predicted tableting failure at the commercial scale. The method will prove useful for scaling up production.

关键词： tableting formulation design wet granulation capping binding single-punch tablet press

Preparation of HPMA and Its Application in Durable press Finishing of Cotton Fabric

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Journal of China Textile University(English Edition) 2000年第3期17卷 32-34页

作者：赵敏周翔 Coll. of Chem. and Chem. Eng. China Textile Univ. Shanghai 200051 China

A series of hydrolyzed poly(maleic anhydride)(HPMA) is synthesized by using maleic anhydride as the monomer and hydrogen peroxide as the *** effects of reaction temperature,reaction time period and amount of initiator on the double bond residue in the products are studied to decide a suitable synthesizing *** amount of the initiator is 50 wt％,and thepolymerization should be carried out at 105℃ for two *** fabrics are finished with the synthesized products and several commercial HPMAs,*** the performance properties of the finished fabrics are *** fabric finished with the synthetic HP-MA using the above-mentioned synthesizing process isimparted a high wrinkle recovery angle.

关键词： cotton fabric crosslink durable press finishing.

Study of Dynamic Robustness of Servo Control System on a Water press

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武汉理工大学学报 2006年第S1期28卷 126-131页

作者： KONG Xiangdong1,YAO Jing1,GAO Yingjie1,ZHANG Qin2 (1.Yanshan University,Qinhuangdao 066004,China 2.University Illinois of Urbana-Champaign,Urbana,IL,USA) Yanshan University Qinhuangdao 066004China University Illinois of Urbana-Champaign UrbanaILUSA

The reliability and robustness of the electro-hydraulic servo control system for heavy-duty forging machine play an important role in forging processes. A mathematic model of 50 MN water press for free forging was created in this research. The dynamic robust compensator integrating with PID control method is designed and applied to the mathematical model simulation. The simulated results approved that the dynamic robust compensator application restrains interference from extra load and improves the electro-hydraulic position servo control system accuracy and stability.

关键词： electro-hydraulic servo control system water press free forging robust compensator

A comparative study on the performances of synthetic diamond made by belt press & cubic press

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金刚石与磨料磨具工程 2008年第S1期28卷 50-55页

作者： Jia Pan~1,Lu Canhua~1,Ye Hongyu~2,Li Zhihong~3 (1.Nanyang Zhongnan Diamond Co.,Ltd.Nanyang,China) (2.Wuhan Wanbang Laser Diamond Tools Co.,Wuhan,China) (3.Industrial Diamond Association of China,Zhengzhou 450013,China )

There are mainly two kinds of equipment to produce synthetic diamond,namely belt press & cubic *** has been customary in the industry to regard synthetic diamond produced by cubic press is inferior to that made by belt *** the on-going improvement in technology,know-how & accumulated experiences, perhaps it’ s time for us to review the qualities & performances of synthetic diamond made by the cubic press more *** were carried out on the performances of the two kinds of diamond by choosing from top brands & top qualities,with coarser mesh sizes 20/30 & 30/*** were made on parameters, such as TI,TTI,PPC,bulk density,compact,roughness and *** the diamonds chosen were used to produce the relevant diamond core drill bits and saw blades,their respective cutting performances such as cutting efficiency,segments consumption were measured and reported in this *** report demonstrates that producing the high quality diamond does not depend on the type of presses(Belt or Cubic) but rather on the know-how,technology and what it is made.

关键词： comparative study,performance,synthetic diamond belt press,cubic press

Load spectrum analysis for combined frame of closed high-speed press

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Journal of Southeast University(English Edition) 2011年第1期27卷 40-46页

作者：郑恩来贾方张志胜史金飞东南大学机械工程学院南京211189

Based on the basic theory of mechanics,kinematic and dynamic analysis for a slider-crank mechanism with a balance mechanism is *** theoretical formula of the load spectrum for the interaction between the crank shaft and the bearing seat of the upper beam is achieved by approximately simplifying the mechanical model of the crank *** simulation for the load spectrum data of combined frame under the operating conditions of blanking or piling is performed using Matlab and the law of the load spectrum curves under these two conditions is *** simulation results show that under a no-load condition,the load spectrum curves of the interaction between the crank shaft and the bearing seat of the upper beam present a form of periodic sine wave and under the piling condition,the load spectrum curves of the interaction between the crank shaft and the bearing seat of the upper beam present a form of periodic pulse *** simulation results can provide a theoretical foundation for the load determination during the process of analyzing the dynamic characteristics on the combined frame of a closed high-speed press through the finite element method.

关键词： press load spectrum crank shaft slider-crank mechanism