A manufacturing system with both quantitative and qualitative (QQ) quality responses (as a QQ system) is widely encountered in many cases. For example, in a lapping process of the semiconductor manufacturing, the quality of wafer’s geometrical characteristics is often measured by the total thickness variation as a quantitative response and the conformity of site total indicator reading as a bin...

The residual stress field of HIPed Si3N4 rolling elements were studied. Two kinds of HIPed Si3N4 ball blanks self-finished at different nominal lapping loads ranging from 1.3kgf/ball to 10.87kgf/ball and four kinds of commercially finished 1⁄2′′ (12.7mm) HIPed Si3N4 balls before, during and after RCF tests were investigated. The experimental results showed that in the finishing process of HIPed...

Conventional material removal of BK7 optical glass will normally result in brittle fracture at the surface, generating severe subsurface damage and poor surface finish. Subsurface damages induced by grinding strongly influence the mechanical strength and optical quality of optical glasses. However, through ductile mode grinding it is possible to reduce the surface and subsurface cracks. It is m...

We d i s t ingu i sh th ree main , over lapping act ivi t ies in an advice-giv ing dialogue: p r o b l e m fo rmula t ion , resolut ion, and exp lana t ion . T h i s pape r focuses on a p rob lem formu la t ion ac t iv i ty in a d ia logue m o d u l e which in te rac t s on one side wi th an exper t p rob lem solver for financial inves t ing and on the o the r side wi th a na t u r a l l anguag...

Abstract Double-sided lapping is an precision machining method capable of obtaining high-precision surface. However, during the process thin pure copper substrate, workpiece will be warped due to influence residual stress, including stress and initial which deteriorate flatness ultimately affect performance components. In this study, finite element (FEM) was adopted study effect stress-related ...

This article presents the results of research funded by Committee Science Ministry and Higher Education Republic Kazakhstan (grant № AP14972884 "Increasing wear resistance metal-cutting tools method lapping"). There was investigated state tools' problem in conditions machine-building enterprises (RK). It is revealed that do not always endure durability period according to standards are exposed ...