MT法によるスイッチ作動力評価技術の研究

抄録

The judgment of a switch performance based on its working force has been traditionally made by the feeling in a sensory test. This paper reports the possibility of making judgment by the use of MTS method. The automation of switch quality inspection to substitute sensory tests has been considered to be difficult. When product quality is clearly distinguishable, automation is easy. But some quality items such as unevenness or roughness must rely on sensory tests. The performance varies depending on the proficiency, or the physical condition of inspectors. It is especially so when the speed of inspection is increased. In the study using MTS method, two groups of characteristics were selected based on the operating reaction of a switch: "difference and limit values" is one type and "the slope of operating force" is another. From each group of characteristics,Mahalanobis distance was calculated for the improvement of evaluation. Mahalanobis distance varies depending on the different ways of selecting the characteristics. However, its quality can be evaluated by the proportional relationship of the abnormality of a product using dynamic S/N ratio. From the study, it was found that there was a difference on the tendency of individual evaluation. But from the different curves on the working force of switches, a new way was found to discriminate the abnormal switch products that were unable to be detected by sensory test.