High-power, nanosecond-pulse Q-switch laser processing has become commonplace in both existing and emerging high-tech industries. As these industries grow and mature, there is increased need for low-cost, high-quality manufacturing techniques. This translates to a need for increasingly precise and efficient laser processing capabilities. In this work, Newport/Spectra-Physics’ latest Q-switch di...

Laser machining efficiency and quality are closely related to gas pressure, nozzle geometry, and standoff distance. Modeling studies of laser machining rarely incorporate gas effects in part because of the complex structure and turbulent nature of jet flow. In this paper, the interaction of a supersonic, turbulent axisymmetric jet with the workpiece is studied. Numerical simulations are carried...

A filter is used to remove undesirable frequency information from a dynamic signal. This paper shows that the Znotch filter filtering technique can be applied to remove the noise nuisance from a machining signal. In machining, the noise components were identified from the sound produced by the operation of machine components itself such as hydraulic system, motor, machine environment and etc. B...

Increasing attention is being paid to complete machining, i.e., machining of the whole part in a single machine tool, in the metal working industry. For this purpose, complex machine tools equipped with machining components, such as multiple spindles and turrets have been developed by leading machine tool builders. The efficiency of complex machine tools is largely dependent on how the machinin...

the paper attempts to study the efficiency of crop production and resource use effi-ciency on temple tenants and owner farms in tirunelveli district of tamil nadu. a sam-ple of 90 temple tenants and 50 owner farmers from two taluks of tirunelveli district, nawely, shencottah and tenkasi were selected for the study. the reference period of the study was 2002-2003. the efficiency analysis with th...

background: assessment of hospitals’ performance in achieving its goals is a basic necessity. measuring the efficiency of hospitals in order to boost resource productivity in healthcare organizations is extremely important. the aim of this study was to measure technical efficiency and determining status of resource allocation in some university hospitals, in tehran, iran.   methods : this study...

  A fuzzy goal programming-based approach is used to solve a proposed multi-objective linear programming model and simultaneously handle two important problems in cellular manufacturing systems, viz. cell formation and layout design. Considerations of intra-cell layout, the intra-cell material handling can be calculated exactly. The advantages of the proposed model are considering machining cos...

Hardened steels are commonly used in wide areas of technologies and industries. In respect of poor machinability of these steels and requirement of expensive cutting tools, study of machining economy is a matter of importance. Thus the present study deals with the economic considerations of various hole making processes. For this purpose, the hard steel samples were machined by conventional dri...

Abstract This paper focuses on process chains for power train components of passenger cars and heavy duty vehicles. In the project “Powertrain 2025” particular attention is being paid to increase resource efficiency manufacturing reduce energy demand during service life. detail cylinder liners are equipped with an adapted geometry topography which reduces friction losses. Process chassis invest...