Shaped saw wire with controlled curvature at bends
AssigneeBekaert Binjiang Steel Cord Co., Ltd.
InventorsAlain SIMONART, Wenxian HUANG
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Abstract
A saw wire to cut hard and brittle materials is disclosed that comprises a steel wire that is provided with bends with segments in between. The average degree of bending of the bends is between 0.5% and 5%. Such a saw wire has a higher breaking load compared to saw wires having a conventional, higher average degree of bending. A method to measure the curvature is described as well as a process to make the inventive saw wire. The invention is applicable to any shaped saw wire for example a single crimped saw wire, a saw wire with at least two crimps in different planes, a saw wire with crimps rotating in a plane.
Claims19
A saw wire for cutting hard and brittle materials comprising a steel wire with a diameter ‘d’ and a centreline, said saw wire having bends with segments in between, said centreline having a top curvature ‘ki’ at each of said bends when measured with a load of about one newton on said saw wire,
- wherein the average of the product of said top curvatures with half said diameter, over a length of saw wire comprising at least ‘N’ bends, with ‘N’ being not less than 50, is between 0.5 and 5 percent or in formula:
- 0.005
- <
- ∑
- i
- =
- 1
- N
-
- k
- i
-
- d
- /
- 2
- N
- <
- 0.050
- .
Dependencies are inferred from the claim text.