Manufacturing Technology Today

Kushal Singh ¹, Manish Kumar ¹, Ashok Ponram ¹, Hari Prasad ¹, Arjun Vedadri ¹

Affiliations
1 Defence Research & Development Laboratory, Hyderabad, IN

Abstract

There are a variety of technologies for digitally acquiring the shape of a 3D object. Broadly it can be classified in two categories i.e. contact and non-contact. The Laser technology which falls under non contact type active scanning technique uses Time-of-flight or triangulation 3D laser scanner to probe the object. In Laser Scanning data is collected by a computer and recorded as data points within three-dimensional space, with processing this con be converted into a triangulated mesh and then a Computer-aided design model, often as Nonuniform rational B-spline surfaces. This paper presents the evolved measurement methodologies with the help of CMM, Portable Laser Scanner and other conventional measurement instruments to generate 3D CAD models & engineering drawings and evaluate the critical parameters for missile subsystems.

Keywords

Laser Scanning, CAD Model, Digitization, Metrology.

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K. Bala Murugan ¹, Manish Kumar ¹, B. Ashok ¹, B. Hari Prasad ¹, Arjun Vedadri ¹

Affiliations
1 Defence Research & Development Laboratory, Hyderabad, IN

Abstract

According to international standards, measurement uncertainties have to be stated with all measurements and any measurement result is meaningless without a quantitative statement of uncertainty. Measurement uncertainty is characterized by the dispersion of values that could be attributed to the result of measurement. The dispersion of measurement result is obtained from the dispersion of various quantities influencing the measurement. The suitable information about the parameters which influence the measurement is described by probability density functions. This paper describes a method for evaluation of measurement uncertainty of high precision length measuring equipment by considering various factors associated with the measurement process.

Keywords

Uncertainty, Calibration, Accuracy.

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R. Thanigaivelan ¹, R. Arunachalam ², N. Natarajan ³, Abdu Rahoof ¹, Jishnu Sanjay ¹, Manish Kumar ¹

Affiliations
1 Mahendra Engineering College (Autonomous), Mallasamudrum, Namakkal Dist, IN
2 Dept. of Mech and Industrial Engg., Sultan Qaboos University, Sultanate of Oman, OM
3 Department of Mechanical Engineering, Muthayammal Engineering College (Autonomous), Rasipuram, Namakkal Dist, IN

Abstract

The application of Ti–6Al-4V alloy in the fields of biomedical and aerospace industries attracts the manufacturing engineers to understand the behavior of alloy during machining. Ti–6Al-4V alloy posses high specific strength and corrosion resistance and besides its advantages they poses challenges in machining due its low thermal conductivity nature. The heat generated during machining is dissipated through cooling medium and cutting tool. Considering the situation detailed experiments are planned for turning of Ti–6Al-4V alloy with varies cutting speed, feed rate and depth of cut. The cutting tool is cooled with the process of evaporative cooling technique by using the water soaked banana fiber pad along with fan and flooded coolant. This method dissipates 39.51% of heat generated during cutting operation at parameter combination of 1200 rpm cutting speed, 1.5mm/rev feed rate and 0.6 mm depth of cut. The lowest average surface roughness (R_a) is recorded at parametric combination of 1200 rpm cutting speed, 0.25mm/rev feed rate and 0.6 mm depth of cut for banana fiber cooled tool. The use of banana fiber resulted in lesser R_a of 0.42μm. Further studies with multi-pad evaporative cooling facilitate for increased tool heat dissipation.

Keywords

Banana Fiber, Evaporative Cooling, Ti-6Al-4V Alloy, Surface Roughness, Cutting Temperature.

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