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Ballscrew is widely used in many fields, such as: electronic machinery, automation equipment, semiconductors, aerospace and the recent emerging medical equipment industry, etc. The ball screw is one of the main products of the case company. In order to maintain the competitiveness of this product in the market, the case company's requirements and attention to the quality of this product are self-evident. This study uses Failure Mode and Effect Analysis (FMEA) to explore the reasons for the failure in the ballscrew manufacturing process, and formulate corresponding improvement methods.
The results of this study show the top five failure modes with the highest risk priority number (RPN) are: “customers have different perceptions of product quality” (RPN=363.6), and “poor thread surface roughness” (RPN= 354.4), “insufficient screw hardness” (RPN=287.3), “screw is bent” (RPN= 262.5), “grinding breakpoint” (RPN=207.7); the failure mode with the highest severity score is “nut assembly reverse”; the failure mode with the highest occurrence score and the highest detection score is “poor thread surface roughness”. The improvement methods are proposed in this study for all the failure modes to prevent and reduce the loss caused by abnormal products.
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