– The purpose of this paper is to improve the key quality performance of the terminal of earphone in an electronic company.
– Sequential experimental designs are employed. Significant input variables are found through a full factorial design. Then a response surface model is constructed considering curvature in the linear model.
– Optimized key input variables’ parameters are found using the response surface model. The key quality performance, coplanarity of the terminal of earphone has been improved.
– Instead of running a full factorial design in the first stage, a fractional factorial may be used to reduce experimental runs.
– The paper presents a good solution for reducing defects caused by large coplanarity of a kind of earphone terminal.
– The methodology used in this case can be easily extended to similar cases.
