Dear Sirs:
I have a friend want to looking for RP postdoctoral research position
or job in your University or company. He will graduate in Sep. 1996 from
Tsinghua University in China. He is a very distiguished PhD candidate
over
there. Can you have a chance to employ him? If not, would you please help
to pass his resume to the related persons ? Thanks!
If you have interests with him and want to know further, please let me know!
Best regs,
Wang Wanlong
Postdoctoral Fellow
Dept. of Mech. & Prod. Engg.
National University of Singapore
Singapore 119260
***************************************************************************
Wei Feng
Bldg. No. 20 Room 209
Dept. of Mechanical Engineering
Tsinghua University
Beijing(100084), P.R.China
Mar. 14, 1996
Dear Sirs:
Greeting from China!
I am a doctor candidate in Department of Mechanical Engineering in Tsinghua
University (Beijing) and will graduate this Sept. I am interested in pursuing
a post Ph.D. in your Department. for the Fall of 1996.
As the enclosed resume indicates, I completed my undergraduate study at
Tsinghua University in July 1992 and received two bachelors(Mechanical Engineering
and Computer Science & Technology). After graduation, I was admitted to advance
my study directly for a Ph.D. at the Center of Laser Rapid Forming in Department
of Mechanical Engineering, Tsinghua University.
Because I have two B.E., mechanics and computer technology, I was appointed
to take the responsibility for the overall design and the development of control
system of M220, a multi-functional RP experimental machine. I was the main designer
of the software system which include STL verifying and repairing, slicing, real
time control, and etc. It took our group only one year to develop the M-220
machine successfully. A new Rapid Forming technology, SSM(Solid Slicing Manufacturing),
was also developed and gained the appraisal of the world advanced level from
the China Education Committee in July,1994, I was also the main designer of
the software and the control system.
For the strong background of mechanics, computer, and RP technology, I chose
the research of another Multi-functional RPMS to do my doctor thesis. I am
also responsible for the software systems' design of two another RP machines
(FDM and LOM) now.
I really want to continue my study in RP area or other manufacturing engineering
areas abroad. Today, Rapid Prototyping(RP) technology has advanced to the point
where it's viewed by many as a strategic tool, and the technology is expanding
rapidly into uncharted territories, with almost limitless potential. With wide
applications of computers, CAD, Simulation and Virtual Reality supply strong
tools for designers and manufacturers, a designer can see very conveniently
if his design fits for manufacturing demands and constraints. By way of Virtual
Assembly, Concurrent Engineering, in which designs and manufacturing are viewed
as an integrated area, has made a rapid progress recently. As a result, many
new thoughts and techniques have come into being. Depending on a common product
database, both engineers can share their information and work much more closely
and efficiently. CIM, which using information technology, has been employed
by many enterprises to improve their strategic competitive ability and remain
competitive in a changing world economy. Advanced manufacturing technologies
have been playing an increasingly important role in industrial engineering.
I have done my best to face these changes and developments. Beside working
hard at my study, I also take part in many research work: design of NC punch's
software and hardware, inject molds CAD software packages, development of RP
technologies and design of RP machines, etc. I also learned many theories and
technologies related to industrial engineering: THEORY OF AUTOMATIC CONTROL,
TECHNOLOGICAL ECONOMICS, MECHANICS OF MATERIALS, NUMERICAL ANALYSIS, PRINCIPLE
AND APPLICATIONS OF MICROCOMPUTER., MANAGEMENT INFORMATION SYSTEMS, COMPUTER
SIMULATION, QUALITY CONTROL and CIM:THEORY AND PRACTICE. All these give me a
very profound understanding and support a solid foundation for deeper probe.
I really want to continue my research on some aspects followed: 1) The
integration of Reverse Engineering, Solidification Modeling and RP for the
production of net-shape cast tooling. 2) Using Virtual Reality in RP to assist
the generation of support structure. 3) Based on the STL file format, establishing
a common standard of data transformation. 4) Developing a Multi-functional RP&M
System which can achieve LOM, FDM, SLA, SLS and some other RP technologies in
only one system. 5) The application of RP technologies, such as in Recuperation
Engineering and molds making, or using RP technologies to investigate ceramics,
photopolymers, or other composite materials. 7) Technology for the direct
production of metallic and polymer parts. 8) CAD/CAM/CAPP integration system.
9) Concurrent Engineering and Computer Integrated Manufacturing System.
10) Other advanced technologies in manufacturing engineering area. Since you
have rich experiences and high reputation in this field, your University has
better research conditions, I will really appreciate any chance to learn from
you. I deeply believe that I can really learn many advanced technologies from
you. Of course, while assiduously pursuing for a post Ph.D. and displaying
fully my originality and potentiality, I hope to do some good to your department.
If you are interested in my research, please give me a reply at your earliest
convenience.
Thanks for your consideration.
Sincerely yours,
Wei Feng
*****************************************************************************
RESUME
OBJECTIVE:
To do academic research work in institute or university on post Ph.D.
EDUCATION:
Sept, 1987--July, 1992 Undergraduate for two Bachelors of Engineering:
Dept. of Mechanical Engineering,
Dept. of Computer Science and Technology,
Tsinghua University, Beijing, China.
Sept, 1992 - Dept. of Mechanical Engineering, Postgraduate
direct for Ph.D. since 1992, majoring in Rapid
Prototyping theory,technology equipment and
software,Tsinghua University, Beijing, China.
RESEARCH EXPERIENCE: (See BRIEF INTRODUCTION OF RESEARCH enclosed)
1) Research on design of Multi-functional RP&M System, mainly on NC system and
software system. (Thesis applying for Ph.D.)
2) Overall design of M-220 multi-functional experimental machine and development
of Its control system, data treatment and control system software. (Thesis
applying for M.E.)
3) Research on RP technology of LOM(SSM), SLA, SLS and FDM.
4) Injection mold CAD. (Thesis applying for B.E.)
5) NC system design(hardware and software) of NC punch.(Assistant work)
==Summer Vacation==
1) Developed some software for Huajiao Co., using AutoCAD Development System
(ADS) and C language.(Summer Vacation in 1993,1994)
2) Developed a 9p printer Chinese characters print software for TianLi Co.(1993).
3) Developed a family property management software system for Stone Co.(1994).
HONORS:
1)"Excellent Student Scholarship", Nov. 1988, Tsinghua University. (For top 10% in my Dept.)
2)"Excellent Student Scholarship", Nov. 1989, Tsinghua University. (For top 10% in my Dept.)
3)"Guanghua Scholarship", Oct. 1990, Tsinghua University. (For top 5% in my Dept.)
4)"Jiang Nanxiang Scholarship", Oct. 1991, Tsinghua University. (For top 5% in my Dept.)
5)"Excellent Graduate Student of 1992", Tsinghua University, July 7,1992.
(For top 5% in all 2300 Graduate students)
6)Recommended to study direct for Ph.D. in Tsinghua University, waived of the
admission test, which is a policy to endow the most distinguished students.
7)"Guanghua Scholarship", Oct. 1993, Tsinghua University. (For top 10% in my Dept.)
8)"Social Practice Scholarship", Oct. 1993, Tsinghua University. (For top 5% in my Dept.)
9)"Guanghua Scholarship", Oct. 1994, Tsinghua University. (For top 10% in my Dept.)
FOREIGN LANGUAGE:
English Listening and reading : Excellent, Speaking and writing: fair.
Japanese Speaking and reading: fair, Listening and writing: a little.
STRONG POINTS:
RP Technology------Rapid Prototyping and Manufacturing Technology,
LOM, SLA, FDM, SLS, 3DP, etc. Equipment R&D.
Especially in Software and Technology.
Mechanical Engineering------Forging Technique, Finite Element simulation,
Thermomechanical Processing.
Software and Hardware R&D of Control System in
Mechanical Eng. CAD/CAM/CAPP.
Industrial Engineering-----CIMS.
Decision and Quality Control System.
Computer Technology-------Excellent in C, C++, FORTRAN, Pascal Language.
Windows 3.1, Win32, Win'95 API and Programming.
AutoCAD, Pro/E, Application.
Computer Graphics, Programming
Novel Network, Application.
DOS and UNIX Operation System.
PUBLICATION:
1) Pan Weiguo, Wei Feng , "The Forming Mechanism and Limit of Pressings with
Curved Surfaces"
2) Wei Feng, Wanlong Wang, "The Method of Data Treatment and Transformation
in Rapid Prototype Manufacturing", China Mechanical Engineering, 1996,1
3) Wei Feng, "CAD/CAM Integration Technologies in Laser Rapid Forming System",
Proceedings of 5th Sino-Polish Conference on CAD in Machinery, June 18-20,1994.
4) Wei Feng, "The Software System Design on Multi-function Rapid Prototype
manufacturing System", Proceedings of 1st China Symposium on RP&M Technology,
Nov. 21-24,1995.
5) Wei Feng, "The Test and Analysis of Slicing Solid Manufacturing Processing
Accuracy", Proceedings of 1st China Symposium on RP&M Technology, Nov. 21-24,
1995.
6) Haibin Guo, Wei Feng, "Design and Analysis of Optical System Used in M-220
Testing Machine Based on SSM Technology", Proceedings of 1st China Symposium
on RP&M Technology, Nov. 21-24,1995.
SPORTS:
5000-m, the second, Tsinghua University Graduate Game, 1994.
5000-m, the third, Tsinghua University Graduate Game, 1995.
Good at long-distance running, swimming, basketball, soccer.
PERSONAL:
Birth: 10/18/69, Xingjiang, P.R.China
Sex: Male
Health: Excellent
Marital Status: Single
REFERENCES
Prof. Yongnian Yan
My supervisor , Director of the Institute of Mechatronics Engineering,
Tsinghua University.
Prof. Baixin Liu
Professor of the Material Science Department., Tsinghua University.
*****************************************************************************
BRIEF INTRODUCTION OF RESEARCH
1. Research on overall design of Multi-function RP&M System, its NC system
and software system.
-----Thesis applying for Ph.D. (1992.9--present)
1) The Multi-functional Rapid Prototyping and Manufacturing System is an
instrument capable of producing a prototype and/or a real part using Laminated
Object Manufacturing(LOM), Selective Laser Sintering(SLS),Fused Deposition
Modeling(FDM), powder/wax/slurry deposition via nozzle method in under 24 hours.
2) Applied intelligent control theory and distribute control method, AT6400(Parker
Hannifin Co., the USA) was used as the main controller of NC system. Assembled
AT6400 and some 8098 chip microprocessors to consist a distribute control system,
an industrial PC-486 worked as the kernel of the M-RPMS.
3) The software system included two main parts: data treatment software and
real time control software. Using Pro/E to design CAD models on a workstation(SGI),
the STL file was generated and served as a data transformation standard. Data
treatment software read a STL file, a data-compress technique was used to
eliminate the data verbose problem that STL file cannot avoid. Verifying and
correcting STL mistakes, 3D model rebuilding, slicing, netting and filling
were main functions of the data treatment software. NC code generating, process
parameters setting, subsystem's control and other works were all the functions
of the real time control software package.
4) Based on PC486, Windows'95, Borland C++4.0, the software is a multi-
functional system, which can fit the needs of LOM, FDM, SLS, SLA and some
other RP technologies. Class Lib, DDE, MDI, Visual Programming and other
techniques were used in the software system. ANN theory was used in parts'
merging and arrangement, ES technology was used to define the direction of
process(Z-axis direction).
2. Overall design of M-220 multi-functional experimental machine and development
of Its control system, data treatment and control system software.
------Thesis applying for M.E.(1992.9--1994.10)
1) Overall design of M-220 M-RPMS, including its mechanical system, NC, laser
system, software and technology control system.
2) Development of M-220's control system. It is a distributed control system that
could meet the special need of reliability, flexibility, expandability of M-220.
Development of M-220's software system, include STL-file Verifying program,
Slicing program, Netting and Filling program, NC Code Generating program,
Real Time Supervisor & Control system.
3) The software system is a multi-function software, which can be directly used
for LOM, SLA, SLS, FDM and other technologies.
4) Using the idea and method of window interface design under DOS operation system
in the software system of M-220.
3. Research on RP technology of LOM(SSM), SLA, SLS and FDM.
1) LOM(SSM) test: based on M-220, the test was concentrated on the processing
parameters and the processing accuracy of Slicing Solid Manufacturing(SSM).
2) The SSM processing accuracy tests consist of two aspects, one is the processing
accuracy test in one layer and the other is the global processing accuracy
test. Orthogonal experiment design and analysis method is used to do researches
on technological processing accuracy test, the optimum technological test
conditions and the arrangement of key factors are obtained, which affords us
theorial and testing basis on the intelligent setting of SSM processing parameters.
LOM (SSM) Technology passed the appraisal of China Education Committee in July,
1994. I was one of the main design group.
3) SLA technology and material performance test: on M-220, the tests are focused
on the diagnostic tests of a new resin and the production of tiny proportional
samples. We use the Windowpane technology to measure Dp and Ec of a new-developed
SL resin, which was developed by our partner Chemical Department and us.
4) SLS and FDM technology test: on M-220, we have also done some tests of SLS and
FDM RP technologies. Based on these tests, we are developing a FDM Machine now.
4. Injection mold CAD.
------Thesis applying for B.E.(1991.9-1992.7)
1) Having made some investigations, studied the structure characteristics of
injection mold, I found that the difficulty of injection mold design was the
cavity design.
2) Based on a PC386, developed a CAD program which could generate injection mold's
cavity, pouring path and separating plane automatically. The program was based
on GCD4.0 and UPL language. GCD4.0 is one of the main CAD productions of CV
Co., the USA.
3) Developed a program to generate the drawings of an injection mold. The program
considered the shrinkage of material, the structure characteristics of injection
mold, and could generate the NC code by PD4.0, an NC part of GCD4.0.
5. NC system design(hardware and software) of NC punch.
------Assistant work
1) In the Simulation Laboratory of our Dept., I have also done some research works
as an assistant. One of the works was the development of the NC system of an NC
punch, including hardware and software.
2) Developed a position control module which could control XY two axis simultaneously,
the precision could be less then (0.01mm. The module is compatible with PC bus.
The control software I developed had some functions, including graphic input
(using keyboard and mouse), NC Code generating and verifying, simulated process,
real time control, and etc. The software was under DOS environment and C language
was used.
6. Other research works
------spare time research works
1) Developed a reverse-counter module which is compatible with PC bus and used for
photoelectricity coder. The module had two input channels, the maximum number
could be (220((1048576).
2) Developed some software using AutoCAD Development System(ADS) and C language,
included: Chinese character editing environment, 2D hidden(parts assemble)
software, drawings' management software, local expanding software, and etc.
These software were developed for Huajiao Co. and have been used widely in
general mechanical design.
3) In order to fit the needs of family computer's users, I developed a family
education software system for Stone Co., which had many functions, such as
Chinese characters input, memo editing and saving, printer management, tele-
phone number record, general medical knowledge, and etc. The software was
based on DOS environment and C language.
4) Because a 9p printer cannot print out Chinese characters, I developed a
software to let the 9P printer print out Chinese characters. Using this
software and a 9p printer, the user can print file as using a 24p printer,
and save more money, especial for family users. The software was edited for
Tianli Co. and based on DOS environment, Assembly language.
*****************************************************************************
PUBLICATIONS
1) Pan Weiguo, Wei Feng , "The Forming Mechanism and Limit of Pressings with
Curved Surfaces"
2) Wei Feng, Wanlong Wang, "The Method of Data Treatment and Transformation
in Rapid Prototype Manufacturing", China Mechanical Engineering, 1996,1
3) Wei Feng, "CAD/CAM Integration Technologies in Laser Rapid Forming System",
Proceedings of 5th Sino-Polish Conference on CAD in Machinery, June 18-20,
1994.
4) Wei Feng, "The Software System Design on Multi-function Rapid Prototype
manufacturing System",Proceedings of 1st China Symposium on RP&M Technology,
Nov. 21-24,1995.
5) Wei Feng, "The Test and Analysis of Slicing Solid Manufacturing Processing
Accuracy",Proceedings of 1st China Symposium on RP&M Technology, Nov. 21-24,
1995.
6) Haibin Guo, Wei Feng, "Design and Analysis of Optical System Used in M-220
Testing Machine Based on SSM Technology",Proceedings of 1st China Symposium
on RP&M Technology, Nov. 21-24,1995.
ABSTRACTS
1) "The Forming Mechanism and Limit of Pressings with Curved Surfaces"
Based on experiments, this paper explores the pressing forming mechanism of
workpieces with curved shapes, analyze the deformation of each point of flat
blanks in a die and the process that flat blanks are predded close to the
punch, proposed the wrinkling and breaking limit while a flat blank taking
shape of curved surface in die.
2) "CAD/CAM Integration Technologies in Laser Rapid Forming System"
Laser rapid forming is a new "additive" process, which use a laser
scanning device to polymerlize, fuse, carve, or cut the layering
material, directly copy solid or surface CAD models to hard 3D
models. CAD/CAM integration refers to the information extraction,
exchange, sharing and handling between each module of CAD,
CAPP and CAM, that is totally integration of information stream.
The CAD/CAM integration in laser rapid forming system is a link
between CAD data base and the data laser rapidforming machines needed,
that is information intergration.
3) "The Method of Data Treatment and Transformation in Rapid Prototype Manu-facturing"
This paper introduces the method of data treatment and transformation
in rapid prototype manufacturing, analyses the effects of data treatment and
transformation on parts' precision, and gives two improved methods.
4) "The Software System Design on Multifunction Rapid Prototype Manufacturing System"
The software system of Multifunctional Rapid Prototype Manufacturing System
(M-RPMS) is introduced in this paper. M-RPMS is a multifunctional technological
platform based on technology integration, on this platform we can achieve many
kinds of RP technologies such as LOM, FDM, SLS, SLA, 3DP and etc. The software
system must fit different technological needs, achieve the functions followed:
CAD modeling, data treatment & transfer, data check & repair, slicing, processing
parameters input, NC code generating, and real time monitor.
The software of M-RPMS consist of three parts: CAD modeling software, data check
& treatment software, monitor software. CAD software achieves geometric modeling,
hand-adding supports and STL files output. Data check & treatment software
reads STL files, checks and repairs invalidates and slices 3D objects. The
monitor software inputs slicing information and processing parameters, generates
NC codes and achieves real time processing. CAD software and data treatment
software are the same to LOM, FDM, SLS, SLA and 3DP, just because different
processing technologies, they have different needs on processing parameters,
different methods of hatching and monitor. So the monitor software must fit
different technological needs, controls the processing machine to finish different
technologies, achieves the goal of multifuctional fast prototype manufacturing .
5) "The Test and Analysis of Slicing Solid Manufacturing Processing Accuracy"
In this paper, the researches are concentrated on the processing parameters
and the processing accuracy of Slicing Solid Manufacturing(SSM). The SSM
processing accuracy tests consist of two aspects, one is the processing accuracy
test in one layer and the other is the global processing accuracy test. Orthogonal
experiment design and analysis method is used to do researches on technological
processing accuracy test, the optimum technological test conditions and the
arrangement of key factors are obtained, which affords us theorial and testing
basis on the intelligent setting of SSM processing parameters.
SSM technology uses the theory of laminated processing. The processing accuracy
in one layer is the principal factor which defines the global processing accuracy.
The factors which effect the accuracy in one layer include: the dimensions of
laser facula, laser power, scanning speed, heater-roller's temperature, heater
-roller's pressure, heater-roller's speed, quality and thickness of the row
material(paper), quality of adhesive and etc. The processing tests in one layer
are centered on these factors. Using orthogonal experiment design method, we
get two kinds of orthogonal lists, one considering the interaction of these
factors but the other not. Comparing the results obtained from the two kinds
of lists, we can define better testing condition.
The Global processing accuracy is defined by the degree that a prototype is
keeping with its design in shape, dimensions and surface. To do the researches
on global processing accuracy, we design a standard prototype which affords us
many group data. The standard prototype reflects the dimensions accuracy, shape
accuracy and surface accuracy of parts produced by SSM system successfully.
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