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IE 330 Note 1

by: Wen Xuanhao

IE 330 Note 1 IE 330

Wen Xuanhao
U of I

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Notes 1
Industrial Quality Control
Douglas King
Class Notes
Industrial Engineering
25 ?




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This 2 page Class Notes was uploaded by Wen Xuanhao on Friday March 4, 2016. The Class Notes belongs to IE 330 at University of Illinois taught by Douglas King in Spring 2016. Since its upload, it has received 19 views. For similar materials see Industrial Quality Control in Industrial Engineering at University of Illinois.

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Date Created: 03/04/16
Quality Improvement in the Modern Business Environment 1.1 ● Dimensions of Quality - Performance (Will the product do the intended job?) - Reliability (How often does the product fail?) - Durability (How long does the product last?) The effective service life of the product - Serviceability (How easy is it to repair the product?) How quickly and economically a repair or routine maintenance activity can be accomplished - Aesthetics (What does the product look like?) This is the visual appeal of the product - Features (What does the product do?) - Perceived Quality (What is the reputation of the company or its product?) - Conformance to Standards (Is the product made exactly as the designer intended?) ● Definition of quality: 1. Traditional definition: Fitness of use a. quality of design: the quality which the producer or supplier is intending to offer to the customer; the variations in grades or levels of quality, intentional b. quality of conformance: how well the product conforms to the specifications required by the design 2. Modern definition: Quality is inversely proportional to variability (unwanted or harmful) 3. Quality improvement is the reduction of variability in processes and products. a. Excessive variability in process performance often results in waste. b. quality improvement is the reduction of waste Quality Engineering Terminology ● Quality characteristics (critical-to-quality (CTQ) characteristics): 1. Physical: length, weight, voltage, viscosity 2. Sensory: taste, appearance, color 3. Time Orientation: reliability, durability, serviceability ● Variability - reason why difficult to identical quality characteristics, only be described in statistical terms - Attributes data: discrete data, taking the form of counts - Variables data: continuous data (length, voltage…) ● specifications: the desired measurements and the desired values for quality characteristics ● A value of a measurement that corresponds to the desired value for that quality characteristic is called the nominal or target value for that characteristic. ● The largest allowable value for a quality characteristic is called the upper specification limit (USL), and the smallest allowable value for a quality characteristic is called the lower specification limit. ● Over the Wall Approach: the process of marketing, engineering design, manufacturing, testing and production where each stage of the development process is carried out separately, and the next stage cannot start until the previous stage is finished. ● Nonconforming products are those that fail to meet one or more of its specifications. A specific type of failure is called a nonconformity ● Concurrent Engineering has stressed a team approach to design, with specialists in manufacturing, quality engineering, and other disciplines working together with the product designer at the earliest stages of the product design process. Statistical Methods for Quality Control and Improvement - Statistical process control, design of experiments, and (to a lesser extent) acceptance sampling; - Control Chart (in SPC, used for process evaluating/monitoring): (un)controllable inputs, Quality Characteristics (CTQs), Output product - One major type of designed experiment (Off-line quality-control tool) is the factorial design, i.e. factors are varied together in such a way that all possible combinations of factor levels are tested - Acceptance sampling, from a sample of units selected at random from a larger batch or lot and the ultimate decision about disposition of the lot, usually occurs at two points: incoming raw materials or components, or final production. - Sampled lots may either be accepted or rejected (rectifying inspection).


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