Nippon Light Metal Company, Ltd.

Fuji Xerox Co., Ltd.

Nikkei Techno-research Co. Ltd.

Takuo Kusano

Koji Masuda

Kazuo Asano

Ken Ebihara

Masatoshi Namba

Kouichi Masuda

It is an object of the invention to provide a dielectric drum where manufacturing costs can be reduced while keeping pressure resistance high and having an anodic oxidized film with a uniform dielectric characteristic, and also to provide an electrostatic recording device which is inexpensive and provides a high image reliability using the dielectric drum. According to the present invention, a dielectric drum includes an aluminum substrate and a dielectric layer of an anodic oxidized film on the surface of the aluminum substrate. The aluminum substrate is produced by conducting a drawing and hardening treatment M on an aluminum alloy pipe of the 5000 series alloys of the Aluminum Association. Also, the dielectric drum is used to construct an electrostatic recording device. The electrostatic recording device includes toner image forming means for forming a toner image on a dielectric drum, and pressure applying means for transferring by pressure or transferring and fixing by pressure the toner image on the dielectric drum to a member to be transferred.

Dielectric drum and electrostatic recording device using the same

The method for producing an aluminum wheel rim comprises axially pressing a thin walled cylindrical aluminum or aluminum alloy material under the action of compressive stress acting thereon through tapered portions of a die and a punch cooperating therewith in a press machine so that the diameter of the material is enlarged so as to form the required configuration of the rim, while the wall thickness of the material is increased at positions where compressive stress is applied through the tapered portions of the die and the punch thereby increasing the mechanical strength of the material at positions where otherwise weakening tends to occur due to the thinning of the wall thickness of the material by the roll working thereof. In order to successfully carry out the method, it is preferred to select the ratio H/D of the height H of the material with respect to the inner diameter D thereof to be equal to or less than 1.5, the ratio t/D of the wall thickness t of the material with respect to the inner diameter D to be in the range of 0.006 to 0.06 and the mean deformation resistance or mean flow stress of the material to be in the range of 10 to 25 kg/mm.sup.2, while the inclination angle of the tapered portions of the die and the punch is set to be in the range of 10.degree. to 65.degree..

Method of producing an aluminum wheel rim

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Tokyo, Japan

Takuo Kusano