Aluminum pipe having excellent surface quality, method and apparatus for manufacturing the aluminum pipe, and photosenstive drum base body

Abstract

In a manufacturing method in which an aluminum bullet is extruded to obtain an extruded raw pipe 4 and then the extruded raw pipe 4 is subjected to a drawn process, the aluminum extruded raw pipe 4 is cut at a position within 10m from a discharge position M of an extruding die to obtain an aluminum extruded raw pipe 4 with a length of 10m or shorter, and the extruded raw pipe 4 is subjected to a drawing process. With this, an aluminum pipe excellent in surface quality having no surface defect such as white peeling can be manufactured at high manufacturing efficiency.

Description

[0001] This application requires the Japanese patent application No. 2003-303334 submitted on August 27, 2003 and the U.S. provisional application submitted on September 3, 2003 (title of the invention is: aluminum tube with excellent surface quality and its manufacturing method and manufacturing device and Aluminum Tube with Excellent Surface Quality, Method and Apparatus for Producing the Same and Photosensitive Drum Substrate, Applicant: SHOWADENKO K.K, Inventor: Koji Iwanaga, TakeshiGOCHO , Kunihiro SAGAWA, Youichi MOMO, the provisional application has not yet been notified of the application number from the US Patent Office), the disclosure content of which directly constitutes a part of the application of the present invention. [0002] Representation of related applications [0003] This application is based on Section 119(e)(l) of the U.S. Patent Law, and is based on the U.S. provisional application filed on September 3, 2003 in accordance with Section 111(b) of the U.S....

AI Technical Summary

Problems solved by technology

[0008] However, in the aluminum drawn tube manufactured as above, there are many very small and elongated rib-shaped surface defects (hereinafter referred to as "white roads") as shown in the optical microscope photo of Figure 14 along the drawing direction (Figure 14 , the white line extends obliquely upward from the center of the photo image)

In recent years, as photosensitive drums of electrophotographic devices such as copiers, printers, and facsimile machines, excellent image quality has been demanded, but aluminum tubes that have surface defects such as the above-mentioned white marks cannot fully meet the requirements.

In the aluminum drawn tube obtained by the above-mentioned conventional manufacturing method, the yield of good-quality products without surface defects such as white spots, that is, the material utilization rate is about 70%, so the production efficiency is low.

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