日本锻造技术现状

日本锻造技术现状

RESEARCH AND DEVELOPMENT OF PRECISION FORGING IN JAPAN

1

T. Nakamura1 , K.Osakada2

2

Faculty of Engineering, Shizuoka University, Japan

Graduate School of Engineering Science, Osaka University, Japan;

Summary

The historical trend of Japanese precision forging is reviewed first, and then the results of research and development in recent 15 years are introduced. New forging methods such as enclosed die forging, divided flow method, forging utilizing friction, controlling of elastic deformation of die, extrusion against pressure supported tool, forging of sheet metal are explained. Some topics related with servo controlled mechanical press, finite element simulation and tribology are also presented.

Keywords: Japan, precision, forging, servo, press, simulation, tribology

1 Introduction

1.1 Car Production in Japan

Since about 70% of the forged products are used in the automotive industry in Japan, the historical trend of the domestic production of cars is explained by using Figure 1. The automakers began production of small passenger cars around 1960 and the annual production grew rapidly until the oil crisis

increase of export.

From around 1990, overseas manufacturing

production decreased, and thus the forging car makers are producing almost half of

their cars in their overseas factories.

1.2 Precision Forging 1960 - 1990 forging was introduced in the 1960s from production of small parts.

Cold forging was chosen as one of the national projects and Prof. H. Kudo was

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