Continuous Wire Drawing from Rod

Commercial wire starts as a coil of hot-rolled rod about 9 mm thick. After the scale is removed, the rod is pulled through a row of ever smaller dies, each wrapped round a driven drum, or block, that pulls it on to the next; one machine may hold 3 to 12 dies. Each die takes away 15–25 % of the area on fine wire and 20–45 % on heavier wire, and the wire gets longer as it gets thinner. Cold drawing makes it stronger; if the total reduction passes about 50 % it is annealed before drawing on. High-carbon steel rod gives music wire, stainless rod stainless wire, and copper rod copper wire, which may get a final anneal for ductility and conductivity.

高级

Continuous (industrial)

说明

Clean the rod

The hot-rolled rod, about 9 mm, is uncoiled and its scale is removed.

此步骤所需材料：

高碳钢盘条1000 公斤

不锈钢盘条1000 公斤

铜杆1000 公斤

Point and string up

The end is pointed, pushed through each die and wound round each block in turn: this is called stringing-up.

所需工具：

连续拉丝机

硬质合金拉丝模

Draw

Lubricant floods the dies while each block pulls the wire through the next, smaller die; each block turns faster than the one before.

此步骤所需材料：

拉丝润滑剂1 升

所需工具：

连续拉丝机

硬质合金拉丝模

Anneal when needed

Past about 50 % total reduction the wire is annealed before further drawing. A final anneal may follow to make the wire more ductile and, for copper, more conductive.

所需工具：