穿孔機、プラグ及び継目無管の製造方法

Title:

穿孔機、プラグ及び継目無管の製造方法

Document Type and Number:

Japanese Patent JP4780107

Kind Code:

B2

Abstract:

A plug 2 used for a piercer according to the invention includes a tip end portion 23, a cylindrical portion 24, a barrel portion 25, a mandrel coupling portion 22, and an injection hole 21. The injection hole 21 penetrates from the surface of the cylindrical portion 24 to the surface of the mandrel coupling portion 22 and an externally supplied lubricant is injected from the hole. A clearance forms between the pierced material and the cylindrical portion 24. The injection hole 21 is formed at the cylindrical portion 24, and therefore the material in the process of piercing does not contact the injection hole 21. Therefore, an inner surface defect attributable to the contact between the material and the injection hole 21 can be prevented from being generated.

Inventors:

Kazumune Shimoda
Tomio Yamakawa

Application Number:

JP2007521315A

Publication Date:

September 28, 2011

Filing Date:

June 14, 2006

Export Citation:

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