发明名称 PLUG, METHOD OF EXPANDING INSIDE DIAMETER OF METAL PIPE OR TUBE USING SUCH PLUG, METHOD OF MANUFACTURING METAL PIPE OR TUBE, AND METAL PIPE OR TUBE
摘要 <p>The plug is for expanding the inside diameter of the end portion of a metal pipe. Its cross section is a circle, and includes a taper portion and a parallel portion connected to the tail end of the taper portion. The diameter of the taper portion gradually increases from the head end of the taper portion to the tail end of the taper portion where the diameter is D1. The axial distance LR from the point where the diameter D2=D1×0.99 to the tail end where the diameter is D1 satisfies the Expression 22≰LR/((D1−D2)/2)≰115. The taper angle on the surface where the diameter is D2 is larger than or equal to the taper angle on the tail surface of the taper portion following the point where the diameter is D2. The diameter of the parallel portion is D1.</p>
申请公布号 EP1799374(A1) 申请公布日期 2007.06.27
申请号 EP20050785771 申请日期 2005.09.15
申请人 SUMITOMO METAL INDUSTRIES, LTD. 发明人 OKUI, TATSUYA;KURODA, KOICHI;AKIYAMA, MASAYOSHI
分类号 B21D39/20 主分类号 B21D39/20
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