Investigation of Shrinkage Defect in Castings by Quantitative Ishikawa Diagram

Abstract

Metal casting process involves processes such as pattern making, moulding and melting etc. Casting defects occur due to combination of various processes even though efforts are taken to control them. The first step in the defect analysis is to identify the major casting defect among the many casting defects. Then the analysis is to be made to find the root cause of the particular defect. Moreover, it is especially difficult to identify the root causes of the defect. Therefore, a systematic method is required to identify the root cause of the defect among possible causes, consequently specific remedial measures have to be implemented to control them. This paper presents a systematic procedure to identify the root cause of shrinkage defect in an automobile body casting (SG 500/7) and control it by the application of Pareto chart and Ishikawa diagram. with quantitative Weightage. It was found that the root causes were larger volume section in the cope, insufficient feeding of riser and insufficient poured metal in the riser. The necessary remedial measures were taken and castings were reproduced. The shrinkage defect in the castings was completely eliminated.

An Improvement of Quality of the Rear Cover of Bearing Turbine with the use of Selected Methods

“…In order to identify the causes of porosity cluster the Ishikawa diagram and 5Why method were used. These methods are popular and are described in the literature of study (Bilsel and Lin, 2012;Chokkalingam et al, 2017;Pacana et al 2014;2015;2019;Salvador and Goldfarb, 2004;Benjamin et al, 2015;Braglia et al 2017;Malindzak et al, 2017). In the main part of the diagram the nonconformity was noted (porosity cluster) and the potential causes these problems were noted in the next element of the diagram.…”

Quality Management of Aluminum Pistons with the Use of Quality Control Points

“…It is important that employees and management are aware of and oriented towards solving problems and correcting errors that may occur in internal processes, and in particular to eliminate their causes. [4,5,17,22].…”

Control of incompatibilities in the production of helmets for mining

“…Fig. 2 presents the Ishikawa diagram [9][10][11][12] for the problem of cracks, inaccurate casting of the shell. This diagram was implemented on the basis of brainstorming carried out among the employees of the analyzed plant, which take an active part in the preparation and implementation of the helmet's production.…”