Madhawa's Blog

i'm Madhawa Ranga following BSc. in Materials Science and Engineering at the University of Moratuwa.

New Blog January 28, 2016

මේ බ්ලොග් අඩවිය ලිවීම මම නවතා ඇති අතර, මාගේ පවත්වාගෙන යන බ්ලොග් අඩවිය වෙත පහත සබැඳියෙන් යන්න.

මීට අමතරව මාගේ අනෙකුත් බ්ලොග් අඩවිද පරික්ෂා කර බලන ලෙස ආරාධනා කරමි.

කොටස් වෙළඳපළ ආයෝජන අත්වැල =

ඡායාරූපකරණ අත්වැල =

වෘත්තීය මාර්ගෝපදේශන අත්වැල =

හරිත තාක්ෂණ බ්ලොග් අඩවිය =




Rapid Prototyping April 25, 2009

This is a facinating and a latest technology used for prototype manufacturing.
I thought of sharing some info related to this because, most people don’t know what this is.
University of Moratuwa has a Rapid Prototyping machine brought from Germany about 8 months ago, with the funds of national Science Foundation and Induastrial Development Authority, and now sharing it with the industry at a conciderable price. It is very usefull tool for designers who want to make prototypes of their designs (like vehicle, new type of phone casing, engine parts, new shape of a computer mouse, etc) before going to the production process. it is quick, low cost and easy. No need of making moulds, struggling with machines, can produce very complex shapes. All aredone through the computer and feeding the data to the machine.

Below are some details I got from the internet.

Rapid prototyping is the automatic construction of physical objects using solid freeform fabrication. The first techniques for rapid prototyping became available in the late 1980s and were used to produce models and prototype parts. Today, they are used for a much wider range of applications and are even used to manufactureproduction quality parts in relatively small numbers. Some sculptors use the technology to produce complex shapes for fine arts exhibitions.

Rapid prototyping takes virtual designs from computer aided design(CAD) or animation modeling software, transforms them into thin, virtual, horizontal cross-sections and then creates each cross-section in physical space, one after the next until the model is finished. It is aWYSIWYG process where the virtual model and the physical model correspond almost identically.

With additive fabrication, the machine reads in data from a CAD drawing and lays down successive layers of liquid, powder, or sheet material, and in this way builds up the model from a series of cross sections. These layers, which correspond to the virtual cross section from the CAD model, are joined together or fused automatically to create the final shape. The primary advantage to additive fabrication is its ability to create almost any shape or geometric feature.

The standard data interface between CAD software and the machines is the STL file format. An STL file approximates the shape of a part or assembly using triangular facets. Smaller facets produce a higher quality surface.

The word “rapid” is relative: construction of a model with contemporary methods can take from several hours to several days, depending on the method used and the size and complexity of the model. Additive systems for rapid prototyping can typically produce models in a few hours, although it can vary widely depending on the type of machine being used and the size and number of models being produced simultaneously.

Some solid freeform fabrication techniques use two materials in the course of constructing parts. The first material is the part material and the second is the support material (to support overhanging features during construction). The support material is later removed by heat or dissolved away with a solvent or water.

Traditional injection molding can be less expensive for manufacturing polymer products in high quantities, but additive fabrication can be faster and less expensive when producing relatively small quantities of parts.

Rapid prototyping is now entering the field of rapid manufacturing and it is believed by many experts that this is a “next level” technology.[citation needed]

(from Wikipedia)

Mainly there are 4 main technologies used for rapid prototyping.

Prototyping technologies Base materials
Selective laser sintering (SLS) Thermoplastics, metals powders
Fused deposition modeling (FDM) Thermoplastics, eutectic metals.
Stereolithography (SLA) photopolymer
Laminated object manufacturing (LOM) Paper

But 2 more are there

Electron beam melting (EBM) Titanium alloys
3D printing (3DP) Various materials

A youtube video on RP.

Read more on RP,
Go to RP home page >>>

from these technologies the RPM in the University of Moratuwa use the Stereolithography technique with the use of a UV reactive photo polymer.

The RPM in University of Moratuwa can produce models with the maximum dimensions of 25,25,25 cm in volume. The machine is in the Engineering Design Center at the University of Moratuwa, and anyone interested or want a job to be done, can call the Design center and ask for shedules and prices.


Seed for Need January 3, 2009

Filed under: EDC,seed for need,university of moratuwa — madhawa.h @ 5:52 pm

Engineering Design Center (EDC) of University of Moratuwa is starting a new project named “Seed for Need” to share the resources at the university with the Industry, to help the industry to do and design their work do their researches, etc.


Junior new Inventors preparing for their next competition

The Junior new inventors (the first 10) are now prepairing for their next competition with another 10 exhibitors of NSF (National science foundation) competing for the USA tour sponsored by Intel. the exhibition will be held on around 20th of January.
They had a workshop on how to prepair display bourds and how to use Autocad and Solidworks to do their designs at the University of Moratuwa on 29th and 30th of December 2008.
Good Luck.


Department of Materials Science and Engineering – University of Moratuwa – Sri Lanka March 5, 2008

Filed under: engineering,mateials science,materials,university of moratuwa — madhawa.h @ 11:28 am

University of Moratuwa is the only university in Sri Lanka which conducts a Bsc. Engineering degree program in the field of materials engineering. The students who follow this four year program of studies, which is conducted by the “Department of Materials Science and Engineering“, have the opportunity of specializing in the areas of ceramics, metals and/or polymers.

in addition to its main function of producing materials engineers to the industry, the department’s objectives extend to providing assistance to the Sri Lankan industry in the form of technical advice, research, providing testing facilities, and technical training. The qualified staff in the department of materials engineering as well as the other staff members in the university has the expertise to advice on most of the technical problems encountered by the industry.

Long-term industrial problems are generally studied by the students as final year research projects under the supervision of a senior staff member. There is also provision for those who work in the industry to register for a postgraduate study program such as M.Sc. M.Eng. or M.Phil. by research. The research topic may be selected on an industrial problem encountered by the industry and may be carried out under the supervision of department staff utilizing the facilities available in the department and the industry. This is because, in industry the problems encountered are multifaceted and industry-university liaison is very essential to solve such problems.

A wide range of equipments and facilities are available in the department for teaching and research purposes. Some of the equipments available in the department are Scanning Electron microscope, X-ray Deffractometer, thermal analysis unit, optical microscopes, infra-red spectrometer, mechanical testing equipments.

History of “The Department of Materials Science and Engineering”

The Department of Materials Engineering presently the only academic body in Sri Lanka offering undergraduate studies in materials engineering, began as Department of Materials Science, a division of School of Applied Science, which was established in April 1974 with the assistance of British Government when a link-arrangement referred to as Katubedda-Leeds Link, was forged between the University of Moratuwa & University of Leeds.