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UBUHANZI
UBWIZA N'UBUZIMA
UBUKORIKORI
UMUCO N'AMATEKA
IMYIDAGADURO
IBIDUKIKIJE
IBIRIBWA N'IBINYOBWA
UBWUBATSI BUSUBIRA INYUMA
UBUMENYI
SIPORO
IKORANABUHANGA
IBYAMBARWA
Disc Pressing Die: Hardened Steel, the Bore Lapped Along the Stroke (Schumacher & Souden, 1944)
The die in which powder is pressed into a flat disc: a block of hardened steel with a round bore, and close-fitting plungers that press the powder in it. The bore is lapped with rouge along the stroke, so its last fine scratches run the way the disc comes out.
Result: a die for pressing metal or ceramic powders into discs, at 5 to over 100 tons per square inch.
Source: E. E. Schumacher and A. G. Souden, Some Aspects of Powder Metallurgy, Bell System Technical Journal 23 (1944), pp. 431-433 and 454-455. Unknown: the steel, the hardening, sizes and clearances. Picture drawn by Youblob.
Hejuru
Unknown
Amabwiriza
1
1
Make the die and plungers
Make the die and plungers
Make the die of steel with a round bore through it, and plungers that fit the bore closely; there must be some clearance between them. Make the bore about three times as deep as the disc will be thick. Light, fluffy powders need a deeper die and longer plungers. Ours: tool steel for the die, and a lathe to bore and turn. Not given: the steel, sizes, clearance, the plungers' metal.
Ibikoresho by'iyi ntambwe:
Inkoni ya kare y'icyuma cy'ibikoresho1 die
Icyuma kitazwi1 plungersIbikoresho bikenewe:
Imashini yo guhinguza icyuma
Ingano zitazwi2
2
Harden the die
Harden the die
Harden the die. For very abrasive powders, make the die of hard carbide or line it with carbide instead. Ours: a heat-treating oven and a quench. Not given: the hardening heat and quench.
Ibikoresho bikenewe:
Itanura ryo gutunganya hakoreshejwe ubushyuhe
Indobo yo gukonjesha3
3
Lap the bore along the stroke
Lap the bore along the stroke
Polish the bore to a high finish by lapping with polishing rouge, moving the lap in the direction of the plunger stroke. The fine scratches that remain then run the way the pressed disc is pushed out, not across it.
Ibikoresho bikenewe:
Umutuku w'umucuzi4
4
Press a disc
Press a disc
Fill the bore with powder and press it with the plungers in a mechanical or hydraulic press, at 5 to over 100 tons per square inch. The powder hardly flows sideways, and friction at the die wall makes the pressure uneven: a part that is long for its width may come out with a soft, less dense middle. Push the disc out along the bore.
Ibikoresho bikenewe:
Imashini ikanda ikoresha amaziIbikoresho
2- Umwanya
- 1 plungersUmwanya
Ibikoresho bikenewe
6- Umwanya
- Umwanya
- Umwanya
- Umwanya
Ibikoresho by'Ibishushanyo Bifitanye Isano
10% igabana
Tool-Steel Bar: Crucible Steel Drawn Out at a Cherry-Red Heat
na Forge
Umucuzi
32
0
0
0
5
0
10% igabana
Jewellers' Rouge Precipitated from Copperas, Ure 1839
na Charlie
Bidafite Ubuzima
12
0
0
0
1
0
10% igabana
Hydraulic Press
na Emma
Ubucuzi bw'Ibyuma
54
0
0
0
10
0
10% igabana
Building a Screw-Cutting Lathe — The Machine That Makes Other Machines
na Gimli
Ubucuzi bw'Ibyuma
57
0
0
0
4
0
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