Applying the 5 Why method to verification of non-compliance causes established after application of the Ishikawa diagram in the process of improving the production of drive half-shafts

The automotive industry is one of the most important branches of the global industry. For this purpose, products are produced by an extensive network of suppliers. They supply components directly to the (OEM - Original Equipment Manufacturer) or to the secondary market of parts. In recent years, the economic situation in these companies has dramatically deteriorated and it is associated with a decrease in new car sales. These companies are constantly making decisions to improve their production processes using various quality tools. These actions may help to increase their competitive advantage and thereby improve their financial situation. The surveyed company produces drive half-shafts for different types of cars. The studies were carried out to analyse the causes of non-compliance - falling band from the housing on the drive shaft. In order to identify and verify the causes for non-compliance and undertake corrective action following methods were used: Ishikawa diagram, 5WHY and brainstorming.