Abstract: It is of great significance to set bottleneck buffer to improve the stability of production system and the efficiency of output.According to the complex operating conditions of multi workpiece,multi working procedure and multi machine in the production of air suspensions,the basic model of bottleneck buffer which make the bottleneck procedure wait for the shortest time and make the cost lose least is established based on the fault degree and maintenance degree of machine,the Working in Process (WIP) inventory cost,the loss of bottleneck shutdown and the abnormal production fluctuation.In addition,the basic model of bottleneck buffer is amended according to the interval of process caused by the strategy of batch processing and withholding workpieces.At last,this modeling method is applied to validate the production scheduling of the key components in mechanical structure of the air suspensions and forecast the best bottleneck buffer accurately.

Key words: bottleneck buffer, withhold workpieces, mathematical modeling, model modification