Tham khảo tài liệu 'manufacturing handbook of best practices 2011 part 4', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 4 DFMA DFSS John W. Hidahl Design for manufacture and assembly DFMA and design for Six Sigma DFSS are complementary approaches to achieving a superior product line that maximizes quality while minimizing cost and cycle time in a manufacturing environment. DFMA is a methodology that stresses evolving a design concept to its absolute simplest configuration. It embodies ten simple rules which can have an incredible impact on minimizing design complexity and maximizing the use of cost-effective standards. DFSS applies a statistical approach to achieving nearly defect-free products. It uses a scorecard format to quantify the parts process performance and software if applicable capabilities or sigma level. It facilitates the effective design of a product by aiding the selection of 1 suppliers parts 2 manufacturing and assembly processes process 3 a system architecture and design performance and 4 a software process software that minimizes defects and thus produces a high-quality product in a short cycle time. DESIGN FOR MANUFACTURE AND ASSEMBLY DFMA The DFMA methodology consists of six basic considerations and ten related rules as shown in Table . DFMA is intended to increase the awareness of the engineering design staff to the need for concurrent product and process development. Several studies have proven that the design process is where approximately 80 of a product s total costs are determined. Stated differently the cost of making changes to a product as it progresses through the product development process increases by orders of magnitude at various stages. For instance if the cost of making a change to a product during its conceptual design phase is 1000 then the cost of making the same change after the drawings are released and the initial prototype is fabricated is approximately 10 000. If this same change is not applied until the production run has started the cost impact will be approximately 100 000. If the need for the design change is not recognized
