圧縮着火によるパンチレス衝撃打抜き性に及ぼす燃料量の影響

抄録

In this study, punchless punching by the compression ignition of octane and the effect of varying the amount of fuel on punchability were investigated. In the experiment, the compression in compression ignition was applied using a drop hammer. As the amount of fuel increased, the variation in the initial height of the hammer required for completing the piercing could be divided into the following four parts o the basis of the amount of fuel. In the first part, corresponding to the smallest amount of fuel, the height exhibited a large decrease. In the second part, the height decreased by a small amount. In the third part, the height increased. Finally, in the fourth part, corresponding to the largest amount of fuel, the height remained constant. The four parts were believed to be caused by differences in the chemical reactions. Moreover, the optimum amount of fuel for punching was the largest amount of fuel under the conditions of the first part.