Patent ID: 7904281

Claim:
A mounting process simulation system for a reflow soldering process in which a solder printing step, a component placement step and a reflow step are carried out, said mounting process simulation system comprising: a condition setting section for setting condition parameters for mounting process simulations, an analysis section for carrying out the respective simulations of said solder printing step, said component placement step and said reflow step on the basis of said condition parameters and for storing and outputting a plurality of analysis results showing different kinds of mounting process performance values calculated in the respective simulations, an evaluation processing section for creating a single evaluation value showing a common process performance value (Q(X)) by weighing and normalizing the plurality of analysis results of the different kinds of the mounting process performance values from said analysis section and for comparing the evaluation value with a preset target value, and an optimizing section for searching for a tentative parameter on the basis of said evaluation value and said plurality of analysis results from said analysis section at the time when said evaluation value does not reach the target value, and for outputting the tentative parameter to said condition setting section as condition parameters, wherein said evaluation processing section is configured such that said evaluation value is calculated by a mounting process performance value, wherein said mounting process performance value is calculated by using a first mounting process performance value and a second process performance value, wherein said first mounting process performance value is obtained from said analysis results of said respective simulations in said analysis section, and said second mounting process performance value is obtained from results of experiment which is conducted by using facility parameters in advance, and includes a contribution degree, and said second mounting process performance value (Eqi(X)) obtained by the experiment result has an upper limit value (Ui), a lower limit value (Li), an ideal value (Oi) and the contribution degree (Wi) of the respective step, and said mounting process performance value (Qi(X)) of the respective step is normalized by the following equation; Qi ( X )=|( Fqi ( X ))−( Oi )|/( Ui−Li )× Wi, wherein Fqi(X) means said first mounting process performance value obtained by said analysis results of said respective simulations.