EFFECT OF QUALITY ON THE ECONOMICS OF ASSEMBLY PROCESSES

Abstract

Production of a. defect .free component and assembly requires a . routine adoption of defect-prevention-oriented - plans and procedures. Quality control procedures are thus required in .preventing the defects. An on-line control scheme is necessary to keep the process under control.. The process of planning effective control of assembly-quality begins long before the product 'finally arrives on an assembly floor.. This control starts with the activities of the. design engineering, and follows . through every .step of pre.-production planning and tool designs. Considerations are taken into account while preparing process sheets and conducting .motion-time study. Assembly is increasingly gaining importance in the production of industrial products because it is in the assembly that the end product takes,. its, final shape. Besides, there is always pressures to increase productivity' and quality. The assembly shop also plays a prominent role in the production of machines of high quality, determining, their efficiency` and,serivice life. The technical inspection of. the assembled unit or machine has to be properly organized.. The task of the technical inspection service in the assembly shop is to check the parts and units for correct joining and interaction and the whole machine ;for correct assembly. The checking requirements must comply with the technical specifications detailed for the acceptance of finished parts, units and the machine as a whole. It is often useful -when. discussing the cost of. complex test and verification stations to remember the effect of poor quality .products on the manufacturer. With poor quality there is obviously an increased risk of warranty cost escalating. Assembly processes are affected by the quality of the component parts. being assembled. It is rather impossible to guarantee 100% 'quality of components during manufacture, so it -must be expected that defects will proceed to the assembly process. The central element of assembly planning concentrates on the design of the product from the assembly point of view. This planning also fixes the type and the sequence of assembly opera-tions. Four types of case studies has been undertaken in B.H.E.L. .Hardwar.- There as follows: i.) Assembly design and-quality. ii) Defectives impairing quality. iii) Product parameter and quality. iv) A finished product not meeting specifications. These case studies reveal the fact that how the quality affects the assembly. process. The quality plays a major role in the assembly process.- So it has been studied how to improve upon the quality of a product for final assembly. Ultimately, from the studies, .a conclusion has been drawn with the help of a flow chart, which when followed, will help in the maintenance of quality of the product during assembly