Door Gap Improvement On The New Microwave Oven Product In W Company

How is the gap uniformity among the cosmetic parts on the microwave oven is one of the most important quality control contents.which is even related to whether the consumers are willing to buy this product.Company W is a large multinational company specializing in the design and manufacture of home appliances.According to the marketing research results of new products in 2019,There are more than 80% of consumers who tend to consider the overall appearance of microwave ovens as the first stimulus for purchase.The gap between the door and the control box is one of the critical indicates for measuring the quality of the microwave oven's appearance.This paper elaborates how to stably manage the critical parameters on the microwave oven in terms of the new product development knowledge in W company.The main research purpose is to refine the gap evenness between the door and the console on the new product LP and then to find the root cause and improve the yield rate through the key parameter management.First of all.It summarizes the logic and the basic overview of critical parameter management based on the product development process of W corporation.Secondly,Taking door gap as the main research object by adopting CPM in this paper.A quality improvement group was formed dedicated on the door gap failure.The team members used 4M1 D method and checked how the door gap was generated from the aspects of material,man,machine,method and design.Then the component variance was screened out as the root cause by using the data analysis and the field observation as well as brainstorming,etc.Later.The team identified the plastic door length as the main factor through measurement system evaluation(MSE)and component of variation(COV)and other tools.In order to improve and stabilize the door length.The team continued to analyze the flow chart of the plastic door frame and then found the direct reason was the breakage of the anti-inverse ring of the injection molding machine,which led to door gap failure.Last,The door gap issue was solved by taking the process capability of the door frame into account in the CPM.Finally.After quality improvement study,The defective rate caused by the door gap beyond the spec was dropped from the initial 4.5% to 0.5% for W corporation.At the same time,through the use of key parameter management to study the issue.It further improves the enthusiasm of the company in quality improvement and also provides experience and lessons to other similar quality issues.Not only does it effectively enhance the market competitiveness of LP product and ensure the products are able to sustainably meet the customer requirements.But also leverage the quality improvement reference for other similar appliance corporations.