Transactions of Materials and Heat Treatment

Title：Research on cold extrusion forming process of center elongated-hole for automotive steering screw

Authors： LIU Bai-xuan SUN Hong-xing LIU Hua WANG Wei-qin LIU Dan

Unit： Zhengzhou Research Institute of Mechanical Engineering Xi'an Jiaotong University

KeyWords： elongated hole steering screw cold extrusion

ClassificationCode：TG376

year,vol(issue):pagenumber：2013,38(6):128-131

Abstract：

The ratio of length to diameter of an automotive steering screw center elongated hole is up to 15, and the month diameter is small, but the inside diameter is large. Usually it is machined with low production efficiency and high manufacturing cost. Three forming processes were designed considering the blank shape, sizing after the elongated hole formed and the shape of the extrusion mandrel, respectively. After the dies were designed and made, forming experiments were carried out. The experimental results show that all the three forming processes can form the elongated stepped center hole, but the degree of process complexity, and the size and shape of forgings after forming are slightly different. Finally, a good forming process was selected that the Ф12.5 mm through hole was firstly machined in the blank and the Ф12 mm center elongated-hole and the Ф8 mm end hole were secondly formed by inserting the stepped mandrel.

Funds：

郑州机械研究所研发基金资助项目（70709011）

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