Original document(5 pages)  中文版
    The present invention relates to furniture producing technology. One conic die, which has lower end inner diameter equal to the outer diameter of one cylindrical steel pipe and upper inner diameter slightly smaller than the diameter of one cylindrical steel pipe, is pressed into the steel pipe from its one end by means of one oil press to produce conic middle pipe. Compared with available techonlogy, the present invention has the advantages of stable product quality, low cost, low labor strength and others.
Application Number
申请号		 02102601 Application Date
申请日		 2002.01.16
Title 名称 Making process of conic middle tube
Publication Number
公开号		 1432441 Publication Date
公开日		 2003.07.30
Approval Pub. Date Granted Pub. Date
International Classification 分类号 B21D41/00
Applicant(s) Name
申请人		 Xu Guangping
Address 地址 313300
Inventor(s) Name 发明人
Attorney & Agent 代理人
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