Ceramic-made guide for rolling line
AssigneeNGK Insulators, Ltd.
InventorKeiji Kawasaki
Life of this patent
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Abstract
A ceramic guide for a rolling line, used for wire rod transfer in a rolling line, which has a cylindrical contour and a throughhole for wire rod transfer. The throughhole includes a tapered hole and a straight hole of constant diameter, the tapered hole being provided at the wire rod inlet side of the guide. This ceramic guide, when used in a rolling line, is less liable to cause seizure with a wire rod and has higher durability.
Claims7
A guide for wire rod transfer in a rolling line, said guide being comprised of sintered silicon nitride or sialon and having a cylindrical contour and a throughhole for wire rod transfer, said throughhole having an as-fired surface and a surface roughness, R.sub.max, of 10 .mu.m or less and having a first end and a second end, said throughhole being tapered at said first end so as to gradually decrease from a maximum diameter at said first end to a minimum diameter at a point within said guide, and said throughhole having said minimum diameter from said point to said second end.
A guide unit for a rolling line, comprising
- (a) a plurality of ceramic guides having a cylindrical contour and a throughhole for wire rod transfer, said throughhole including a tapered hole and a straight hole of constant diameter, said tapered hole being provided at a wire rod inlet side of each guide, and
- (b) a metallic housing of curved cylindrical contour accommodating the guides,
- wherein any two adjacent guides are provided so that a plane perpendicular to a central axis of one adjacent guide and a plane perpendicular to a central axis of the other adjacent guide define an angle of larger than 0.degree. but smaller than 30.degree..
Dependencies are inferred from the claim text.