![]() Swaging is of great antiquity, possibly dating to the beginning of the 2nd millennium BCE in Egypt and in the Bronze and Iron Ages in Europe for torcs and fibulae. In this method a metal rod was struck between grooved metal blocks, or between a grooved punch and a grooved metal anvil. Square and hexagonal wires were possibly made using a swaging technique. There is some evidence for the use of drawing further East prior to this period. The strip twist wire manufacturing method was superseded by drawing in the ancient Old World sometime between about the 8th and 10th centuries AD. Such twisted strips can be converted into solid round wires by rolling them between flat surfaces or the strip wire drawing method. From the middle of the 2nd millennium BCE most of the gold wires in jewelry are characterized by seam lines that follow a spiral path along the wire. This strip drawing technique was in use in Egypt by the 2nd Dynasty ( c. This causes the strips to fold round on themselves to form thin tubes. In some cases, strips cut from metal sheet were made into wire by pulling them through perforations in stone beads. In antiquity, jewelry often contains large amounts of wire in the form of chains and applied decoration that is accurately made and which must have been produced by some efficient, if not technically advanced, means. Edge-wound coil springs, such as the Slinky toy, are made of special flattened wire. Usually cylindrical in geometry, wire can also be made in square, hexagonal, flattened rectangular, or other cross-sections, either for decorative purposes, or for technical purposes such as high-efficiency voice coils in loudspeakers. In electricity and telecommunications signals, a "wire" can refer to an electrical cable, which can contain a "solid core" of a single wire or separate strands in stranded or braided forms. Wires are used to bear mechanical loads, often in the form of wire rope. Wire gauges come in various standard sizes, as expressed in terms of a gauge number or cross-sectional area. Wire is commonly formed by drawing the metal through a hole in a die or draw plate. Sample diameter 40 mmĪ wire is a flexible, round, bar of metal. The conductor consists of seven strands of steel (centre, high tensile strength), surrounded by four outer layers of aluminium (high conductivity). For other uses, see Wire (disambiguation).
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |