Research Of Product Cost Estimation Based On Function In DFC

With the development of economic globalization, the global market is taking shape gradually and developing constantly, and producing the high-quality products with the lowest costs within the shortest time has already become the manufacturers' competition focus. Running side by side engineering technology reflects this thought, people constantly develop the support tool DFX(Design for X), such as design for manufacture, design for assembly, etc. The application of these tools has made some effects in shortening the products' development cycle, but there is no substantive progress in reducing of the cost of the products. In reality, the products' designers don't usually grasp enough knowledge of products' cost. Therefore, studying the estimating method and predicting theory of products' cost in design process as well as the design method for reducing the products' cost and realizing the technologically economically synthetic optimization for products' design plan have very important meaning in reducing the products' cost as well as improving its market competitiveness.Based on the study of the domestic and international products' cost estimating method, the paper spreads out from four following respects. First, study the concept and the key technology for DFC and analyze every factor influencing the products' cost within the products' life cycle; second, set up the estimating model of products' cost based on the function to meet the modem products' design idea of the "top-down", unifying the products' cost and structure on this functional concept; third, based on the functionally estimating model of the products' cost, propose two grades of products' cost estimating method based on the function . The method can be used in the cost' estimation in the whole course of product design; finally, regarding Solidworks as the developing platform, Delphi as the programming tool, structure a based on function-based products' cost estimating system to tentatively prove the practicability and feasibility of this text's estimating method.