Research On Modeling And Simulation And Optimization Of Mechanical Workshop In Aerospace Fastener Enterprise

With the rapid development of China’s aerospace business, aerospace fastenerbusiness faces new opportunities for development. But the changes of the marketenvironment introduces new features for manufacturing: make to orders (MTO), morevariety, middle and small lot size, high quality, short delivery time and lower cost,which presents new challenges to aerospace fastener enterprises. How to develop andproduce the products in need quickly is the most important problem to be solved.Aerospace fastener enterprises need to re-examine and make appropriate adjustmentsfor its existing production systems to match the market demand. As one of the coreaerospace fastener business shops, machine shop has direct impacts on the output andproduction cycle of the whole enterprise. Owing to the multi-type of equipment andlarge number of devices in the machine shop, functional layout is the most commonlayout form in aerospace fastener business machine shop. Although functional layoutshows strong adaptation to the variety of products, this layout form lets the workshopmanagement become complicated, resulting in long order cycle, unbalanced productionprocess, low capacity utilization rate and other issues. Due to the inherent complexity offunctional layout workshop, it is difficult to build a mathematical analysis model tosettle this problem, however, computer simulation techniques shed a light on thesecomplicated systematic problems.In this paper we proposed the Simulation modeling approach of the mechanicalworkshops of aerospace fastener enterprises based on in-depth study of the features ofthe shops. This approach includes four aspects:①formulate production cells based onsecondary buffer and push-pull delivery mechanism;②formulate batch managementbased on opening and closing the paths before and after the device;③formulate theconversion of machines between different products;④formulate the scheduling networkand establish product process sequence table and creation basic information tables ofproducts. And we used Simio as our simulation software to complete the simulationmodel of mechanical workshop of A Company. The modeling approach this paperproposed is also suitable for the modeling and simulation for other functional layoutproduction systems and it has theoretical and practical value for the research onmodeling and simulation of production systems. In this paper we also presented theoptimization method based on simulation for mechanical workshops of aerospace fastener enterprises, and we conducted an optimizing research according to thesimulation results of A Company: we conversed the function layout of A Company intocombination layout of functional layout and flexible cell, and analyzed the optimizationprogram through simulation, and determined the optimal transfer lot size of thepost-optimizing mechanical shop. Through the comparative analysis of simulationresults before and after optimization of mechanical workshop we proved the feasibilityof flexible cell layout in mechanical workshops of aerospace fastener enterprises.