IMEKO Event Proceedings Search

   

Page 168 of 977 Results 1671 - 1680 of 9762

N. Venkatachalapathi, S. Sudhakara Babu, A. Ramakrishna Rao
Predicting the performance of Flexible Manufacturing Systems – A multiple regression approach

This paper attempts to establish quantitative relationship between output indicators like Total Flow time, Resource utilization, AGV utilization and input variables like part arrival rate, uniform processing times at Machining centers and AGVs and decision rules such as Large remaining capacity, small number busy, cyclical and random rules in a dynamic dedicated FMS. Dummy data are generated and the system is simulated to produce the output indicator for a given set of input variables and decision rules. The simulation results are employed to develop Multiple Regression equations for each output indicator. Dummy dependent variables are used in the Regression. The results indicate a significant relationship between the variables and the output indicators.

J. Gren, K. Konkarikoski, R. Ritala
Optimal measurement schedule to support quality management

In industrial processes, such as in papermaking, the product quality is measured from end product samples in laboratory. It is a common practice to measure all quality parameters at regular time intervals. However, this is costly and may limit possibilities to measure those quality parameters that would be most important for overall uncertainty management and thus for decision support. This paper show general theory for measurement information dynamics and discusses how we can find the lowest cost measurement schedule satisfying the constraints on uncertainty in quality information. This paper gives theoretical approach with real data application and results show how optimal measurement schedule can be obtained to support quality management.

M. M. Bhoomkar, P. B. Likhite , L. G. Navale
Experimental investigation and modification in inking rollers of offset printing to achieve WCM approach in SMPI

Due to technological advancements and globalization, technically perfect, aesthetically attractive, quality products are available in market. To meet expectations of quality and survive global competition, the World Class Manufacturing (WCM) approach is imperative. The small and medium scale printing industries (SMPI) should also be world class, as they are directly related to advertising, packagings and newspaper industries. Printing is the process of uncertainty. Minute change in the process parameters like ink properties, paper quality, machine performance and operator skills may cause drastic variation in print quality. In this paper an attempt is made to experimentally investigate the trend of variation of print quality parameters to control the process variation and modification suggested in the machine to control the quality.

K. N. Vijaykumar, S. S. Mantha, Arun Kumar
Measurement system analysis with attribute data

This paper highlights improvement in quality of data produced by measuring instruments. If measuring instruments itself is not producing the accurate data, analysis of manufacturing process will no longer be meaningful. All measurement systems and equipments have some degree of measurement error or uncertainty. Under such circumstances it has become important to understand the magnitude of the variability the instrument causes and how to bring uncertainty within reasonable limits. In order to determine the amount of variation, the thorough study of capability of measuring systems is of prime importance. The present case study highlights the application of Measurement System Analysis (MSA) with attribute data in a leading automotive industry assembly line.

P. P. Shah, R. L. Shrivastava, D. J. Tidke
Six sigma application for process improvement - A case study

In a fast changing world, competitive advantage comes through operational efficiency. Operational efficiency drives profit, return on investment, and ultimately, shareholder value. It is companies that can bring well-designed new products to market quickly, operate efficiently with minimal overhead, and produce high-quality products with minimal scrap or rework that will succeed and grow. A critical factor in operational efficiency is the ability to design and build high-quality products. Six Sigma has been recognized globally as a structured statistical quality improvement process leading to operational and performance excellence through error free and robust process. This paper discusses six sigma fundamentals as well as various success stories of its implementation in companies like GE, Motorola etc. There are several approaches and strategies suggested for adopting six sigma The strategies and their effect depends on operational characteristics as well as cultural settings of an organization. Similarly, there are number of tools and techniques that can be effectively employed in various situations for getting optimum results. The paper attempts to develop an approach/strategy for implementing six sigma in Indian industrie7. The application through a case study is finally reported with its detailed findings.

T. S. R. Murthy
Measurement and evaluation of three intersecting axes of precision equipment

In many precision machines and equipment, there are 2 or 3 axes intersecting at a point as per the drawing theoretically. One example is gyro spin axes construction. The other examples are N/C Machine tools with spindle and table and space equipment. In all of the above examples the axes are meeting at a common point. Presently each axis is measured separately for its straightness or perpendicularity with some surface. Though the axes can be measured separately, one cannot say to what extent they are meeting at a common point. And there are no standards to specify this error. As there are no methods so far to consider all the three axes simultaneously, satisfying condition, that they meet at a common point, a measurement and evaluation technique has been attempted in this paper. As the axis measurement data can be obtained on a CMM, different evaluation methods are explained in this paper. The algorithm takes into account the condition of passing through a point. This technique helps in managing the knowledge about each axis and the knowledge about all three axes. This knowledge and method of evaluation helps in managing such situations. The article also suggests different ways of specifying the accuracy in combination. A method to evaluate the axes when all the three axes are mutually perpendicular and later when any three axes are closely approaching is established by the author and now the method is established for any 3 axes meeting at a point.

V. N. Borikov
Measurement system for coating quality control during high-current process in electrolyte solution

This paper presents both a tool and a method for control of ceramic coating process by high pulse current in electrolytes. The method is based on the use of symmetric trapezoidal voltage pulse power source for oxidation, running volt-ampere characteristics and defining active and capacitive currents what allows to estimate the coating quality.

P. M. M. S. Sarma, L. Karunamoorthy
Quality improvement in machining GFRP composites by PCD tooling using response surface methodology

The present study proposed the analysis of cutting forces of GFRP pipes using PCD tool. The filament wound tubes with different fibre orientations are prepared for the purpose of a work specimen. The process parameters used are cutting speed, feed, depth of cut and fibre orientation. The tool forces are measured using KISTLER Dynamometer. The effect of process parameters on Cutting, Thrust and Feed forces is evaluated and the optimum cutting conditions for minimizing the tool forces are evaluated which result in high quality machined surfaces. Second order models have been developed between each of the responses and the process variables using response surface methodology. The predicted values and measured values are in close acceptance, which indicates that the developed models can be effectively used for the prediction of the respective tool forces in the machining of GFRP Composite pipes.

A. V. Kale, H. T. Thorat
Measurement of ovality in pipe introduced due to bending

Commonly used pipe bending mechanisms are studied in the small-scale industries. Defects introduced in the pipe due to bending on these mechanisms are observed and reasons behind these defects are studied. Ovality is a main defect in the entire pipe bending techniques. To measure the ovality, experimentation is carried out on the existing compression bender. Out of various sizes and materials available, ten pipes of three different materials with variable thickness are selected. Their maximum and minimum diameters are checked before bending. From these diameters, initial ovality and percentage ovality is computed and recorded. These ten pipes are bent on the existing compression bender. Maximum and minimum diameters of these pipes are measured after bending. Increase in percentage ovality after bending is computed. Average values of the percentage ovality are presented in this paper. From the experimental results, it is observed that bent pipe is almost flattened in the bent portion in the existing mechanism, which reduces strength and aesthetics of the fabrication work and hence required to be controlled.

Albert Weckenmann, Peter-Frederik Brenner
A fuzzy logic based system analysis approach for design of experiments

Design of Experiments (DoE) is mainly used during process planning, manufacturing and assembly. When the task of a DoE project is to analyse and optimize complex products or processes, the phase system analysis will become a crucial step in the DoE approach. The paper combines the use of fuzzy logic and multi criteria decision making methods with DoE and points out an approach for system analysis of products and processes. The system analysis approach can be integrated into software for DoE.

Page 168 of 977 Results 1671 - 1680 of 9762