Browse Prior Art Database

INTEGRATED MANUFACTURING TESTING

IP.com Disclosure Number: IPCOM000148796D
Original Publication Date: 1984-Dec-26
Included in the Prior Art Database: 2007-Mar-30
Document File: 46 page(s) / 2M

Publishing Venue

Software Patent Institute

Related People

Ghosh, Sakti P.: AUTHOR [+2]

Abstract

RJ 4552 (48880) 12/26/84 Computer Science INTEGRATED MANUFACTURING TESTING Sakti P. Ghosh IBM Research Laboratory

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RJ 4552 (48880) 12/26/84
Computer Science
INTEGRATED MANUFACTURING TESTING Sakti P. Ghosh

IBM Research Laboratory

San Jose, California 95 193

ABSTRACT: This paper discusses some statistical and database techniques for integrating tests used in manufacturing products. An analytic model of manufacturing process is developed and is used for establishing criteria for optimally locating work station boundaries. It introduces some applications of statistical databases for real time manufacturing process control. Some new statistical methods of testing, e.g., test-compression, testing-by-sampling, testing-by-factorial-design, are discussed, which can significantly reduce the cost of testing without compromising product quality.

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1. Introduction.

  In a manufacturing environment, the manufacturing process is not perfect, very often it produces a product, whose key properties deviate from what is desired. Hence any good manufacturer establishes certain tolerances for the key properties of the products. The test process of a product is to ensure that the key properties of the products are within the established tolerance limits. The main objectives of product testing are:
(i) To examine a minimum set of properties (at a minimum cost) to assure that the desired properties of the product are satisfied.
(ii) To examine properties
of rite product in environme?zts which are to be encountered by the' product in its expected life time, so that certain producr reliability can be guaranteed.

  In this paper the words properties (of a product) will refer to some measurable variable or observable event in a specific environment. Thus, 'magnetic field exceeding the threshold value when applied current exceeds 1 miliamp', 'find out at what voltage a circuit failure occurs in a card when the temperature exceeds 120 degrees', are examples of properties of a product.

  The basic component of. a product test are as follows: (i) Selection of measurable or detectable properties, (ii) Instrumentation for measurements or

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detection of properties, (iii) Translation of measurable (or detectable) properties to key properties, {iv) Translation of key properties to product quality.

  In the formulation of tests for a product the proper sequence of activities that need to be formulated should be as follows: The first step should be to quantify the quality of the product, i.e. to determine a set of measurable and detectable properties that will characterize the desired quality level of the product. These will be referred to as key properties . In some situations, it may be necessary to prioritize the key properties by superimposing some measure of desirabil...