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Copper and Brass Tube Drawn from Strip
Jewellers make tube from flat strip: the strip is curled into a gutter, then pulled through the shrinking holes of a drawplate, which closes it into a round tube with a seam along it. Drawn over a steel rod, the bore comes out the rod's size. The seam can be silver-soldered for a sealed tube. Copper and brass are both drawn this way, annealed between draws.
中级
Half a day
说明
1
1
Strip width
Strip width
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2
2
Cut the strip
Cut the strip
Mark and cut a straight strip of annealed copper or brass sheet to the width, and taper one end to a point over 2 cm. File the long edges square.
此步骤所需材料：
铜板0.01 sqm
黄铜板0.01 sqm所需工具：
划针
铁皮剪
锉刀套装
6 英寸数显卡尺3
3
Curl it
Curl it
Lay the strip over a groove in the swage block and hammer a steel rod down on it so it curls into a U along its whole length; close the tapered end round the rod by hand.
所需工具：
型砧块
钢芯轴杆
圆头锤4
4
Draw it closed
Draw it closed
Wax it and pull it through the drawplate with the seam facing up, starting in a hole that just takes it. Go down the holes until the edges meet; draw over the steel rod to size the bore.
此步骤所需材料：
蜂蜡5 克所需工具：
钢制拉丝板
拉丝钳
台虎钳钢芯轴杆5
5
Anneal between draws
Anneal between draws
Anneal at a dull red and quench whenever it stiffens.
此步骤所需材料：
水5 升所需工具：
丙烷喷灯
耐火砖
铁匠钳
淬火水桶6
6
Solder the seam
Solder the seam
For a sealed tube, flux the seam and run silver solder along it with the torch. Pickle and rinse.
此步骤所需材料：
银焊料2 克
助焊剂5 克所需工具：
丙烷喷灯耐火砖
安全眼镜7
7
Trim and measure
Trim and measure
Cut off the tapered end, file the ends square and measure the outside diameter.
所需工具：
锉刀套装6 英寸数显卡尺8
8
Troubleshooting
Troubleshooting
Tube drawing troubleshooting.
Flow
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