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1. (WO2017033658) CIRCULAR SAW BLADE WITH TIPS

Pub. No.:    WO/2017/033658    International Application No.:    PCT/JP2016/072177
Publication Date: Fri Mar 03 00:59:59 CET 2017 International Filing Date: Fri Jul 29 01:59:59 CEST 2016
IPC: B23D 61/04
Applicants: KANEFUSA KABUSHIKI KAISHA
兼房株式会社
Inventors: NAKAJIMA, Yasutaka
中島 康貴
OKABE, Fuminori
岡部 史典
Title: CIRCULAR SAW BLADE WITH TIPS
Abstract:
[Problem] Circular saw blades which cut a seam-welded pipe while traveling in synchronization with the traveling speed of the seam-welded pipe and which go around the seam-welded pipe in a seam-welded pipe production line, have an excessive load put on hard tips thereof because of the limited cutting time, resulting in reduced durability and the possibility of chipping. [Solution] A flank 18 is provided with: a first flank 20 located at the center thereof; and second and third flanks 22, 24 located inclined toward each side of the first flank 20. Thus, the vicinity of the lateral sides of the flank 18 has a constant relief angle toward the rear from a cutting edge ridge 34, thereby providing the advantages of an increase in strength and resistance to chipping. Furthermore, a fourth flank 26 having a larger relief angle is separately provided at the rear of the first flank 20 located at the center. Thus, even if the wear on the first flank 20 occurs early, it is possible to reduce the wear on the fourth flank 26 and improve the durability.