Application of root conflict analysis (RCA+) to identify contradiction in manufacturing process

The presence of defects in the product is a sign that the quality level is not good enough. In the drilling process of composite fiber-reinforced plastic (CFRP) there are quality problems, namely failure of machine tooling. Therefore, we will discuss root cause analysis in manufacturing process problems. In addition to analyzing the root of the problem, there are usually conditions called contradictions. Contradiction means a condition in which positive and negative effect simultaneously occur at the same time. Therefore, the Root Conflict Analysis (RCA+) has been adopted to find the root cause of the problem and at the same time identify the contradictions. Based on the results, it was found that there are 3 causes of problems in the drilling process, high cutting speed, high feed rate and large point angle. As well as found several contradictions, regarding drilling productivity, tool temperature, thrust force during the process and drill burr.