Pre-operations In Wire Drawing
Wire drawing is the process by which the wire is stretched and shaped. Wire is threaded through a diamond or carbide die and then wrapped around a capstan in the drawing machine. This capstan turns, and stretches the wire with its pull. The capstan is designed to take up the 12 to 30% increase in footage after the wire passes through the die. The wire drawing machine many contain from one to twenty-one dies, depending upon the finish diameter of the wire and its hardness. Each subsequent die is followed by a capstan of greater size than the previous capstan . |
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Lime has been found to be the most suitable coating for grease drawn bright finishes on carbon steel stock. However, it may be necessary to vary the weight of the lime coating in order to obtain the best balance between bright surface finish, die life, speed, and cleanliness. In fact, actually mixing lime with the grease in the die box may be helpful, or even necessary, depending on the number of reductions and finish required.
With lime coated rod continually running through a die box, the grease eventually becomes contaminated with excess lime, and tends to stiffen. At this point, it is often advisable to cut the grease with a small amount of oil or water to regain a good rolling consistency, and periodically the die box should be cleaned out entirely, and the compound replaced.
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