Cims Environment Engine Valve Design, Analysis And Simulation Study

The research task of this paper comes from one of the major projects of YunNan Province Science Committee, the CIMS Application Project of YunNan Internal Combustion Engines Manufactory. The ordinary design, manufacture and analyzing methods of valve cam mechanism for internal combustion engines are researched indepth in this thesis. Aimed at the deficiencies of traditional design method for valve train cam, a new method for designing cam profile with analysis functions and numerical synthesis is proposed. Firstly, the predesign is carried out by use of the conventional analysis, and then the acceleration curve of the cam driven component is processed and revised discretely according to the requirements of dynamics performance.. The design equation based on a Refined Finite-Difference Algorithm is established and the calculating process is realized by the computer programs. Consequently, the cam profile with good performance can be attained. The machining method of cam with NC machine tool is discussed principally in the section of cam manufacturing, and the concreteness procedures of interactive and visual NC programming by means of UG-II/Manufacturing modules are described. In the end, the kinesis analysis and simulation methods of valve train utilizing UG-II/Motion modules are also discussed.In the environment of CIMS, a CAD/CAM integrated application system of valve cam is developed with UG/OPEN API, which is based on the Engineering Design Integrated CAD/CAE/CAM System UG-II. In this application system, the design of cam profile, machining simulation and cam lift data analyzing can be achieved. The complete data describing of the driven component movement disciplinarian can be acquired after the initiative devise parameters have been input the computer in this system. The precise three-dimensional model of valve cam can also be obtained through calling the Modeling module of UG-II. At the same time, the calculation results of the cam CAD section can be imported into UG- II /Manufacturing module directly. Using the designing information and inputing essential machining parameters, the movement track of the cutter can be generated automatically, thenmachining simulation for valve cam can proceed. The actual machining can also be executed by means of NC machine tool after the postprocessing NC code generated. It is denoted that the developmentof this application system is successful and effective through the practical calcalation example.