Claims
- 1. 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.
- 2. A guide according to claim 1, wherein the first end is tapered such that a transitional portion from the maximum diameter to the minimum diameter has a radius of curvature of 0.5 mm or more.
- 3. A guide according to claim 1, wherein the ceramic constituting the guide has a Vickers hardness of 1,100-1,600 at room temperature and 900-1,200 at 800.degree. C. and a bending strength of 500-1,000 Mpa at room temperature to 800.degree. C.
- 4. A guide according to claim 3, wherein the ceramic has a Vickers hardness of 1,200-1,400 at room temperature and 900-1,200 at 800.degree. C.
- 5. A guide according to claim 1, which has a metallic housing thereon.
- 6. 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..
- 7. A guide unit according to claim 6, wherein a buffer material is filled between outer surfaces of the guides and an inner surface of the metallic housing.
Priority Claims (1)
Number |
Date |
Country |
Kind |
5-334525 |
Dec 1993 |
JPX |
|
Parent Case Info
This application is a continuation of application Ser. No. 08/361,671 filed Dec. 22, 1994, now abandoned.
US Referenced Citations (5)
Foreign Referenced Citations (1)
Number |
Date |
Country |
1 427 882 |
Sep 1969 |
DEX |
Continuations (1)
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Number |
Date |
Country |
Parent |
361671 |
Dec 1994 |
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