3 - Design for Cleanability

Abstract

This chapter presents several guidelines for designing machining process to manufacture parts that can be cleaned without recourse to chlorinated solvents. These are meant to supplement rules for designing parts for the same purpose. These rules are aimed at creating a mindset among product design, process design, manufacturing, and contamination control engineers that they need to collaborate fully and early with one another to produce parts that are easily cleanable. It is mentioned that design of microelectronic components and subassemblies for nonsolvent cleanability is crucial. The underlying premise of this chapter is that if an effort to replace chlorinated solvents in metal cleaning applications is to be successful, the first order of business is to render the manufacturing process compatible with that subsequent effort. The allocations of investigative resources must be at least equally divided between improving the manufacturing process and developing alternative cleaning processes. For this purpose, a Vendor Process Contamination Checklist (Appendix 2) has been developed at IBM San Jose. The checklist emphasizes a systems approach, a comprehensive outlook that ignores nothing, from raw materials receiving/inspection at the vendor to final shipping to IBM, in the manufacturing process. It is based on the principle that solvent replacement in cleaning is not a stand-alone effort, but rather the culmination of a series of efforts to tailor part and process design to make this happen.