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Wire-Arc Spray Gun: Two Crossed Wires, a Vibrating Arc and an Air Blast (Schoop, US 1,133,508, 1915)
The first wire-arc metal sprayer. Two metal wires are pushed through iron tubes until their tips cross. Current through the wires also runs an electromagnet that pulls one tube back, so a small arc springs between the tips and melts them; a jet of air blows the molten metal off as a fine spray and puts the arc out, the magnet lets go, the wires touch again, and the cycle repeats very fast.
Result: a continuous spray of molten metal for coating a surface.
Source: M. U. Schoop, US 1,133,508 (1915). Unknown: the wire metals and sizes, the coil, the air pressure. Picture: the patent drawing.
高级
Unknown
说明
1
1
Make the feed tubes and rolls
Make the feed tubes and rolls
Make two feed tubes ending in nozzles, preferably of iron. For each, mount a pair of feed rolls in a frame to push a wire through the tube. Set the tubes at about 90° to each other so the wires cross as they come out, the nozzles only a few millimetres apart. Mount one tube on an elastic support so it can move a little. Not given: sizes, the roll drive (the air blast may drive a small turbine for it).
此步骤所需材料：
铁管2 feed tubes
未知金属1 rolls, frames
钢板弹簧1 elastic support所需工具：
金属车床
未知尺寸2
2
Fit the electromagnet
Fit the electromagnet
Wind an electromagnet beside the springing tube, so the tube is its armature. Wire the coil into the same circuit as the two tubes and wires, positive to one tube and negative to the other. When current flows the magnet pulls the tube aside and draws its wire slightly back from the other. Ours: enamelled copper wire for the coil. Not given: the coil.
此步骤所需材料：
漆包铜线1 coil未知金属1 magnet core
铜线1 circuit leads所需工具：
螺丝刀套装3
3
Fit the air blast
Fit the air blast
Aim a blast pipe at the point where the wires cross, either close to it or 20-30 mm away, whichever sprays best for the metal. Feed it with compressed air or another gas. Not given: the pressure.
此步骤所需材料：
空气喷嘴1 个
压缩空气软管1 个所需工具：
工业空气压缩机
活动扳手4
4
Spray
Spray
Load a wire of the coating metal in each tube and feed them until they touch. Switch on the current, generally 40 to 75 volts depending on the metal and wire thickness, and the air. The magnet pulls the wires apart, an arc melts their tips, the air blows the melt away as spray and snuffs the arc, the magnet releases, and the cycle repeats very rapidly. The positive wire burns faster, so feed it faster or use a thicker wire; match the feed to the melting. Hold the work in the spray. Without the vibration the arc flickers and the wires may weld together.
所需工具：
直流电源工业空气压缩机未知金属材料
7- 2 feed tubes占位符
- 1 magnet core占位符
- 1 elastic support占位符
- 1 coil占位符
- 1 circuit leads占位符
- 1 个占位符
- 1 个占位符
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