Plug Sheathed Molding Process Optimization And Analysis Of Mould The Fuel Injector Spark

Spark plug sheath parts forming method in the past using the machining forming was carried out on the bar. It not only caused great part of the waste materials, but also caused the low production efficiency because of too long cutting time. Cold extrusion forming technology has been adopted in this paper. It simulated the cold extrusion forming process of the spark plug sheath, optimized parameters and verified the rationality of the numerical simulation. The first two chapters state the categories and their respective characteristics of cold extrusion technology, current situation of the application of the FEM on cold extrusion at the home and the abroad, the metal plastic forming are illustrated briefly in this paper, as well as by the basic principle of application of the related properties of DEFORM. The essential research of this paper is cold extrusion processing technology and modified. The original craft takes three steps—extrusion, backward extrusion and two-way backward extrusion, to forming, then through the test and improve it into two steps-compound extrusion and two-way backward extrusion. Second, through the orthogonal experiment of two steps find out the best parameters: In the compound extrusion one, the die angle is 90°; the work zone of the punch is 2.5mm and the fillet is 1.2mm; the work zone of die is lmm; the vertical plane of die is 1.5mm. In the two-way backward extrusion, the fillet of punch is lmm; the work zone of the punch and die both is 10 mm, the fillet of lower punch assigns 2mm; the fillet of upper punch assigns lmm. Then, simulate the best parameters and analyze the results, like the max press, the effective strain field, the effective stress field, and time-load curve. The fifth chapter analyses the die stress of the combination concave die.In the sixth chapter, experiments have been carried out to certify the dependability and science of the numerical simulation. First cut the parts for two through along the axis, one half is made the metal flow-line experiment, some special parts from the other half is made phase experiment, to observe the microstructure of the special position, measuring macro size of workpiece. It found that both of them are very close after comparison of the simulation results.