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LIST
FEGURÐ OG VELLÍÐAN
HANDVERK
MENNING OG SAGA
SKEMMTUN
UMHVERFI
MATUR OG DRYKKUR
ÖFUGVERKFRÆÐI
VÍSINDI
ÍÞRÓTTIR
TÆKNI
KLÆÐANLEG TÆKNI
Magnetic-Field Press: Soft-Steel Punches as the Poles (Cochardt, US 3,412,461, 1968)
A press that lines magnetic powder up while it squeezes it. Two punches of magnetically soft steel close a die, and two coils around them make the punches the poles of an electromagnet. The field runs straight through the powder from one punch face to the other.
Result: a press for anisotropic magnets, about 4000 oersted in the pressing space.
Source: A. W. Cochardt, US 3,412,461 (1968). Unknown: the die's metal, sizes, coil windings, the press and the pump. Picture: the patent drawing.
Lengra kominn
Unknown
Leiðbeiningar
1
1
Make the punches and the die
Make the punches and the die
Make an upper and a lower press member (punches) of magnetically soft steel. Then the magnetic gap is only the thickness of the part being pressed. Make a die wall that the punches close to form a flat cavity. A wide, thin cavity keeps the field lines straight; they bend only at its edges. Ours: mild steel for the punches. Not given: the die's metal, sizes.
Efni fyrir þetta skref:
Sívöl stöng úr mjúku stáli1 upper and lower punches
Óþekktur málmur1 dieNauðsynleg verkfæri:
Málmrennibekkur
Óþekkt mál2
2
Wind the two coils
Wind the two coils
Wind two coils to sit around the punches, one above the die and one below, so that together they drive a field along the pressing direction. The patent's coils were water-cooled. Ours: enamelled copper wire. Not given: the turns, the wire size, how the cooling water runs.
Efni fyrir þetta skref:
Lakkeinangraður koparvír1 two coilsNauðsynleg verkfæri:
VatnÓþekkt mál3
3
Mount it in a press
Mount it in a press
Mount the punches, die and coils in a press, so the upper punch and the die can move down together while the lower punch stays put. Connect the coils to a current supply. Ours: a hydraulic press and a DC supply. Not given: the press, the supply.
Nauðsynleg verkfæri:
Vökvapressa
Jafnstraumsgjafi4
4
Press a plate in the field
Press a plate in the field
Raise the lower punch, lower the upper punch into the die, and pump in a ferrite slurry: water with 1 to 2 percent dispersing agent. Move the upper punch and die down to press the slurry and drive out the water, and energise the coils at the same time, to about 4000 oersted. A plate 0.5 x 10 x 9 cm took 8200 watts. Demagnetise the plate as far as possible, then raise the punch, lower the die and lift the plate off the lower punch. Ours: a diaphragm pump.
Nauðsynleg verkfæri:
HimnudælaJafnstraumsgjafiVatnEfni
3- 1 upper and lower punchesStaðgengill
- 1 dieStaðgengill
- 1 two coilsStaðgengill
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