UBUHANZI
UBWIZA N'UBUZIMA
UBUKORIKORI
UMUCO N'AMATEKA
IMYIDAGADURO
IBIDUKIKIJE
IBIRIBWA N'IBINYOBWA
UBWUBATSI BUSUBIRA INYUMA
UBUMENYI
SIPORO
IKORANABUHANGA
IBYAMBARWA
Ball Bearings: Races, Balls and Cage
A ball bearing has four parts: an outer race, an inner race, the balls that roll between them, and a cage that keeps the balls evenly spaced. Almost all of it is steel, usually 52100 (1.5% chromium, 1% carbon), which can be made very hard and tough by heat treating; 440C stainless is used where rust is a problem. The races are turned from tubing, the balls are cold headed from thick wire, both are hardened, tempered, ground and lapped to an almost mirror finish, and the cage is stamped from thin sheet. Even an inexpensive bearing's balls may be out of round by no more than 25 millionths of an inch; precision bearings allow five millionths.
Hejuru
Factory process
Amabwiriza
1
1
Turn the races
Turn the races
Cut the basic shape of both races from steel tubing on automatic lathe-like machines, leaving every dimension slightly oversize: the steel usually warps in heat treatment.
Ibikoresho by'iyi ntambwe:
Itiyo y'icyuma cya roulement (52100)1 as requiredIbikoresho bikenewe:
Imashini izunguruka ikora yonyine2
2
Harden and temper the races
Harden and temper the races
Heat to about 843 °C (1,550 °F) for up to several hours depending on size, then quench in oil: hard but brittle. Temper at about 149 °C (300 °F) and let cool in air: hard and tough.
Ibikoresho bikenewe:
Itanura rikomeza ridahagarara rifite gukonjesha mu mavuta
Ifuru yo gusubiza ubukomere3
3
Grind and lap the races
Grind and lap the races
The hardened steel is too hard to cut, so grind almost every surface: the fitting surfaces round, the sides flat. Grind the ball track, then lap it for several hours with a very fine abrasive slurry to an almost mirror finish.
Ibikoresho bikenewe:
Imashini isena impeta za roulement
Imashini inoza inzira y'imipira
Ifu inoza4
4
Cold head the balls
Cold head the balls
Feed thick wire from a roll into a machine that cuts off a short piece and smashes both ends in toward the middle between two dies, without heating. The ball comes out with a ring of "flash" round its middle.
Ibikoresho by'iyi ntambwe:
Urudodo rw'icyuma cya roulement (52100)1 as requiredIbikoresho bikenewe:
Imashini ikora imitwe idashyushye5
5
Remove the flash
Remove the flash
Run the balls many times round rough grooves between two cast-iron discs, one turning and one fixed, until the flash is gone and they are nearly round. Leave about 0.008 in (0.2 mm) for finishing.
Ibikoresho bikenewe:
Imashini ikuraho ibisigazwa ku mipira6
6
Harden, grind and lap the balls
Harden, grind and lap the balls
Heat treat and temper the balls like the races. Grind them in the same kind of disc machine with grinding wheels to within a few ten-thousandths of an inch, then lap them 8–10 hours on cast-iron wheels with lapping compound.
Ibikoresho bikenewe:
Itanura rikomeza ridahagarara rifite gukonjesha mu mavutaIfuru yo gusubiza ubukomere
Imashini isena imipira
Imashini inoza imipiraIfu inoza7
7
Stamp the cage
Stamp the cage
Stamp the cage halves from thin steel sheet and bend them to shape in a die. (Plastic cages are injection moulded instead.)
Ibikoresho by'iyi ntambwe:
Urupapuro rw'icyuma1 as requiredIbikoresho bikenewe:
Ikandagira ryo gukanda ibyuma8
8
Assemble
Assemble
Put the inner race inside the outer race, pushed as far to one side as it goes, and drop the balls into the gap opposite. Centre the races and spread the balls evenly, fit the cage (steel cages riveted, plastic ones snapped in) and coat the bearing with a thin film of petroleum jelly against rust.
Ibikoresho by'iyi ntambwe:
Utuma tw'icyuma1 as required
Vazelini1 as requiredIbikoresho
5- 1 as requiredUmwanya
- 1 as requiredUmwanya
- 1 as requiredUmwanya
- 1 as requiredUmwanya
- 1 as requiredUmwanya
Ibikoresho bikenewe
11- Umwanya
- Umwanya
- Umwanya
- Umwanya
Iki gishushanyo gikora
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