史玉升
长期从事粉末材料近净成形技术和节水产品快速开发领域的教学和科研工作。
个性化签名
- 姓名:史玉升
- 目前身份:
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- 学位:
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学术头衔:
“973”、“863”首席科学家, 博士生导师
- 职称:-
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学科领域:
材料合成与加工工艺
- 研究兴趣:长期从事粉末材料近净成形技术和节水产品快速开发领域的教学和科研工作。
史玉升,男,1962年生。博士,教授,博士生导师,华中科技大学特聘教授。现任华中科技大学材料科学与工程学院副院长、材料成形与模具技术国家重点实验室副主任、湖北省先进成形技术及装备工程技术研究中心副主任、中英先进材料及成形技术联合实验室副主任、中国机械工程学会特种加工分会快速成形技术委员会委员,中国机械工程学会高级会员,中国机械工程学会特种加工分会青年工作委员会委员,湖北省航空学会副理事长、湖北省机械工程学会理事、湖北省机械工程学会特种加工专业委员会副理事长、材料化学与服役失效湖北省重点实验室学术委员会委员、International Journal of Production Research、Journal of Engineering Manufacture等杂志的审稿人等职务。
长期从事粉末材料近净成形技术和节水产品快速开发领域的教学和科研工作,近年来承担863重大项目等28项,作为第一负责人主持16项;获发明专利5项、实用新型专利9项,受理发明专利18项;软件登记3项;项目鉴定4项;教材专著4部;论文100多篇,三大索引收录80多篇;成果达到国际先进或领先水平,获2001年国家科技进步二等奖1项、2005年湖北省科技进步一等奖1项、2006年湖北省科技发明二等奖1项、2006年高校自然科学二等奖1项、2006年高校科技进步二等奖1项;领导的研究团队获2004年湖北省自然科学基金创新群体;建立了粉末激光快速成形技术的学术体系及集成系统,在国内外200多家单位得到应用,并出口到俄罗斯、越南等国家,取得了显著的经济与社会效益。建立了滴灌节水产品创新设计理论及其快速实现方法,定义了滴灌灌水器自抗堵流道设计规则,发明了系列“非迷宫”自抗堵灌水器,建立了滴灌产品“柔性”快速制造平台,得到推广应用,取得重大经济社会效益。
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成果数
8
【期刊论文】Rapid Manufacturing Metal Parts by Laser Sintering Admixture of Epoxy Resin/Iron Powders
史玉升, Jinhui Liu, Yusheng Shi, Zhongliang Lu, Yang Xu, Shuhuai Huang,
ADVANCED ENGINEERING MATERIALS 2006, 8, No. 10,-0001,():
-1年11月30日
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【期刊论文】Compound scan mode developed from subarea and contour scan mode for selective laser sintering
史玉升, Y. Shi, W. Zhang, Y. Cheng, S. Huang
Y. Shi et al. International Journal of Machine Tools & Manufacture 47 (2007) 873-883,-0001,():
-1年11月30日
Scan mode is an important parameter for selective laser sintering (SLS) processing. The improved mode will optimize scan path and improve the precision, strength and fabrication efficiency of a SLS part. A compound scan mode, which combines subarea scan mode and contour scan mode, is proposed. The principle of its hatch (path-planning) algorithm and implementation are presented. To testify the effectiveness of this compound mode compared to that of subarea scan mode, it has been utilized for researches at a SLS machine developed at Huangzhong University of Science and Technique (HUST). The results from the researches indicate that the degree of precision of a SLS part with the compound scan mode is higher than that with subarea one. There is little difference in the tensile strength, flexural strength, shock strength and fabrication efficiency of a SLS part under the compound scan pattern and the subarea scan mode. Therefore, implementation of the compound scan mode is of importance to improve the precision of a SLS part.
Keywords: Selective laser sintering, Improved subarea scan mode, Compound scan mode, Fabrication precision
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史玉升, Y Shi, J Chen, Y Wang, Z Li, and S Huang
Proc. IMechE Vol. 221, Part L: J. Materials: Design and Applications,-0001,():
-1年11月30日
Polycarbonate (PC) powder, a common and low-cost amorphous polymer, can be moulded easily by the process of selective laser sintering (SLS). However, the sintered parts cannot be used as functional parts because of their poor mechanical properties. In this article, epoxy resin was applied to improve the mechanical properties of PC SLS parts. Specimens for testing dimensional accuracy, tensibility, flexibility, and impact strength were made by SLS with 75–100mm PC powder. Some of the specimens were posttreated with two types of epoxy resins. Dimensional accuracy and mechanical properties of the specimens were measured. Microstructures of tensile fracture were observed by scanning electron microscopy. The result shows that the mechanical properties of the specimens are reinforced greatly after the epoxy resin has been infiltrated. Extent of the reinforcement depends on curing agents of epoxy resins. For example, with curing agent W, it is increased to 13.82, 8.00, and 3.69 times, respectively, in tensile, flexural, and impact strength and with curing agent Y, it is increased to 19.87, 7.43, and 1.55 times, respectively, in the same properties. The reinforcement in mechanical properties of PC SLS parts can be improved a step further by means of optimizing the epoxy resin system. Therefore, the PC SLS parts reinforced by epoxy resin can be used as functional parts, if the requirement on mechanical properties is not very high.
selective laser sintering, polycarbonate, epoxy resin, strength,, mechanical property, post process
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史玉升, J. Zhang, Y.S. Shi, J.H. Liu, K.H. Chen and S.H. Huang
Materials Science and Technology 2007, Vol. 23, No. 3,-0001,():
-1年11月30日
The properties of alloy parts can be adjusted conveniently if alloy element powders are used for manufacturing alloy parts by indirect selective laser sintering, but no research has been reported on this so far. In this paper several composite powders have been obtained by blending pure Fe, Cu and graphite powders, which have been used to produce green parts by indirect selective laser sintering. Cu infiltrated Fe–Cu–C alloy was manufactured after green parts had been degreased, high temperature sintered and infiltrated. Contents of composite powders, post-processing of green parts, microstructures and mechanical property of alloys were investigated. The results indicate that: Cu and C can diffuse into c-Fe when green parts are being sintered at high temperature; the microstructures of alloy are composed of a large quantity of eutectoid structures mixtures of Fe–C and Fe–Cu at room temperature besides a coarse structure; the eutectoid structure varies regionally owing to the inhomogeneous concentration of Cu and C; the yield strength of Fe–Cu–C sample alloys is. >300MPa and the elongation is, <3%.
Selective laser sintering, Fe–Cu–C composite powder, Alloy parts, Property
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史玉升, Y Shi, Z Li, H Sun, S Huang and F Zeng
Proc. Instn Mech. Engrs Vol. 218 Part L: J. Materials: Design and Applications,-0001,():
-1年11月30日
The effect of the properties of the polymer materials, such as molecular weight, molten viscosity, crystallization rate and the particle size of the powder, on the quality of selective laser sintering (SLS) parts is researched. The results indicate that the molecular weight affects the quality of the SLS parts through the melting viscosity. SLS parts of higher density can be fabricated with polymer materials of lower melting viscosity. Crystallinity largely affects the precision of the SLS part-shrinkage is more serious with increasing crystallinity. SLS parts sintered with polymer powder materials whose melting peak and crystalline peak differ greatly, have high dimensional precision. The particle size of the powder affects not only the precision but also the density of the SLS part. The appropriate particle size is about 75-100m.
selective laser sintering (, SLS), , SLS part, polymer material, melting viscosity, crystallinity, melting–crystal process, step effect
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【期刊论文】Application software system based on direct slicing for rapid prototyping
史玉升, Y. SHI, X. CHEN, D. CAI and S. HUANG
INT. J. PROD. RES., 01 June 2004, Vol. 42, No. 11, 2227-2242,-0001,():
-1年11月30日
A direct-slicing approach might improve the accuracy and quality of small, complex parts produced with rapid prototyping technology. An application software based on direct slicing for rapid prototyping was used on the foundation of PowerSHAPE models. Lines, conic arcs and cubic bezier curves were adopted as the basic elements describing the direct-slicing contours. Moreover, a scheme to carry out subdivided software development was proposed. A picture (PIC) format le was selected as an interface for the slicing data, and a macro-AutoSection software, which collects the direct-slicing contour data of arbitrary complex computer-aided design models and provides power to produce the direct-slicing PIC files, was developed. On the above basis, an application software called PDSlice based on direct-slicing data processing was developed for the commercial selective laser sintering machine HRPS-III, which was made at the Huazhong University of Science and Technology (HUST), P. R. China. The major input and output interfaces as well as the PIC model reconstruction method of the PDSlice are described. Furthermore, a batch of direct-slicing polymer parts were successfully fabricated with the selective laser sintering machine. The application example shows that the accuracy and surface finish of three-dimensional complex curvature surface parts fabricated with the application software system based on a direct-slicing format were better than the application software system based on a stereolithography (STL) format.
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【期刊论文】A Linear Cross-Coupled Control System for High-Speed Machining
史玉升, Q. Zhong, Y. Shi, J. Mo and S. Huang
A Linear Cross-Coupled Control System,-0001,():
-1年11月30日
We present a linear cross-coupled controller to improve high-speed contouring accuracy independently of tracking accuracy in a biaxial machine tool feed drive servomechanism. Unlike conventional cross-coupled controllers, the cross-coupled controller presented here is a linear system, so it is very easy to perform the stability and steady-state error analysis, and to optimise the controller parameters. The proposed controller is evaluated experimentally on a CNC LOM machine and compared to an uncoupled controller and a conventional cross-coupled controller. Controller performance is evaluated for a circular contour at a feedrate of 30m min-1. The experimental results show that the proposed controller can greatly reduce the contour error at large feedrates. The linear cross-coupled controller is simple to implement and is practical.
Computer numerical control, Contour error, High-speed machining, PID algorithms References
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【期刊论文】Manufacturing metal parts via indirect SLS of composite elemental powders
史玉升, J.H. Liu, Y.S. Shi, Z.L. Lu, Y. Xu, K.H. Chen, S.H. Huang
J. H. Liu et al. Materials Science and Engineering A 444 (2007) 146-152,-0001,():
-1年11月30日
Many more attempts have been made to develop new powder materials to fabricate metal objects via indirect SLS process. Unfortunately, current attention still focuses on singular alloy powders, which has conned the development of indirect SLS. Hence composite elemental powders (CEPS) of Fe–Cu–C system and Fe–Cu–Ni–C system are selected and obtained by briefly blending iron, copper, nickel, graphite and polymer binder powders in this study. Green shapes composed of aforementioned polymer bonded CEPS were formed via indirect SLS process firstly. Then full density hybrid alloys composed of Fe–Cu–C or Fe–Cu–Ni–C system alloys and copper were manufactured after the green shapes had been decomposed at 900℃, sintered at 1200℃, infiltrated at 1200℃ with molten copper and thermally treated. Some aspects of the SLS forming process and post process were discussed. The microstructures and the mechanical properties of sample alloys were investigated either. The bending strength of metal green shapes is 2.41MPa; the binder material decomposes almost entirely below 900℃; copper, nickel and graphite can diffuse into γ-Fe and distribute uniformly after sintering and infiltration process; quenched at different temperatures over 900℃ and tempered at 200℃, the copper infiltrated alloys have a yield strength over 400MPa and a elongation under 3%; compared to that of other alloys, the mechanical properties of hybrid alloy composed of Fe–8Cu–4Ni–0.5C alloy and copper are better. Hence CEPS can be used to manufacture metal parts via indirect SLS process, which is also an additional contribution to SLS.
Indirect SLS process, Composite elemental powders, Hybrid alloys, Thermal treatment, Mechanical properties
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