Abstract
The study is devoted to the defects organizational causes analysis in the machine building products production process. The companies with the small batch production were taken into consideration. Factors related to the time norms fulfilling percentage, the work rhythm, the consolidation of operations at one workplace, the new technologies introduction and equipment failures were chosen. A preliminary factors selection according to independence criteria allowed us to build a reliable regression model for the defects rate calculating. The main factors influencing the defects rate in small batch production are the time norms fulfilling percentage, the rate of consolidation of operations at one workplace, and the number of new technological processes introduced. This allowed us to offer recommendations on the machining sites work organization. The final operations and productswhich are made from expensive metals should be carried out at workplaces with a low rate of operations consolidation. Also, it is important that the wage system should not contribute to over-fulfillment of norms. The maintenance and repair system should prevent malfunctions during operations fulfilment.
Highlights
Product quality management concepts change according to the production development
The traditional quality assessment methods are based on large statistical samples of indicators
The influence of all 5 factors was taken into consideration in the model
Summary
Product quality management concepts change according to the production development. The traditional quality assessment methods are based on large statistical samples of indicators. The statistical concept of ‘six sigma’ is widely used to improve the processes quality and to identify the reject causes [3] This does not applicable to small-batch manufacturing and customer-oriented production. Other authors consider the relationship between the quantity of defective products, caused by the workers’ errors, and the complexity of design and technology [9] This is relevant for labour-consuming processes such as assembly. The quality issues of raw materials and components, which are related to the control factors, go beyond the scope of the production process and are not considered in the work. They are discussed in other investigations, for example [11]. The purpose of the investigation is to determine the organizational factors of the reject during the metalworking operations at a particular workplace in small-batch manufacturing
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