フランジヘッダー試験による線材用
潤滑皮膜評価法の提案

抄録

In the production of fasteners, the lubrication of wire films plays an important role in determining formability and die life. Zinc phosphate is one of the most popular lubricants for wires because of its high performance in terms of lubrication and cost. A one-liquid lubricant has been developed and an attempt has been made to apply it in place of conversion lubricants such as zinc phosphate. However, the performance of the one-liquid lubricant is generally unstable, thus; its improvement is strongly desired. The lubrication of wire films is enhanced by gluing powdered metal soap together at the time of drawing. Therefore, a tribosimulator at the side face of a testpiece is desired. Thus, we designed the shape via finite element (FE) simulation. This tribosimulator test was named the “flange header test”. In this test, forging load is increased at a point known as the lubrication limit. In addition, from the measurement of knockout load, the test enables us to evaluate the galling of a lubricant. Moreover, the test simulates the tendency to bring about die damage as in the case of mass production by continuous forging.