| 摘要 |
Improved metallic rod product which substantially reduces die wear in wire drawing operations, and which provides other advantages during manufacturing. The exterior surface of the rod product is intentionally provided with a predetermined rough texture having certain characteristics, rather than the smooth bright surface conventionally imparted to metallic rod product intended for subsequent drawing into wire. Certain textured surface characteristics of the rod product reduce wear on the first few wire drawing dies by entraining lubricant as the rod moves through the dies, and carry the entrained lubricant into the dies, while at the same time avoiding some common wire drawing defects such as flakes and slivers. The textured-surface rod thus reduces frictional wear of the drawing dies, so that less force is required to draw the rod product through the dies and the useful life of the drawing dies is increased. The desired textured surface of the rod product is preferably provided by hot-rolling with finishing rolls having a roughened surface which is complementary to the desired surface roughness of the rod product; the useful life of such rolls is substantially greater than the life of rolls heretofore used to produce a smooth-finish rod, inasmuch as the textured surface rolls remain usable with a certain amount of wear. The use of complementary textured rolls provides certain texture characteristics not easily produced by any other means. |
