UBUHANZI
UBWIZA N'UBUZIMA
UBUKORIKORI
UMUCO N'AMATEKA
IMYIDAGADURO
IBIDUKIKIJE
IBIRIBWA N'IBINYOBWA
UBWUBATSI BUSUBIRA INYUMA
UBUMENYI
SIPORO
IKORANABUHANGA
IBYAMBARWA
Screwdrivers: Drawn Wire, Cold-Formed Tips and Turned Handles
A screwdriver's shaft, or bar, starts as coiled steel wire drawn to size and annealed, about 1,350 °F (732 °C) for 12 hours. It is straightened and fed to a cold-forming press that cuts it to length and forms the tip and the "wings" that lock into the handle; Phillips tips have their four grooves cut in a separate operation. The bars are hardened in an in-line furnace at about 1,555 °F (846 °C), dropped into an oil quench and tempered at 450–500 °F (about 230–260 °C), then nickel-plated. Handles are usually cellulose acetate, extruded into bars, turned to shape and drilled, and the bar is pressed hydraulically into the handle.
Hejuru
Factory process
Amabwiriza
1
1
Draw and anneal the wire
Draw and anneal the wire
Draw the coiled wire to the shaft diameter and anneal it at about 1,350 °F (732 °C) for 12 hours.
Ibikoresho by'iyi ntambwe:
Umuzingo w'inkoni z'insinga z'icyuma1 as requiredIbikoresho bikenewe:
Imashini ikurura insinga idahagarara
Itanura ryo koroshya ibyuma2
2
Cold-form
Cold-form
Straighten the wire and cold-form each bar: cut to length, form the tip and the wings that key into the handle.
Ibikoresho bikenewe:
Imashini ikanda ibumba idashyushye3
3
Harden and temper
Harden and temper
Heat the bars in an in-line furnace at about 1,555 °F (846 °C), drop them into oil, then temper them at 450–500 °F.
Ibikoresho bikenewe:
Itanura rikomeza ridahagarara rifite gukonjesha mu mavuta
Ifuru yo gusubiza ubukomere4
4
Plate
Plate
Nickel-plate the bars against rust.
Ibikoresho by'iyi ntambwe:
Nikeli1 as required5
5
Make the handles
Make the handles
Extrude cellulose acetate into bars, turn the handles to shape and drill them.
Ibikoresho by'iyi ntambwe:
Utubuye twa cellulose acetate1 as requiredIbikoresho bikenewe:
Imashini izunguruka ikora yonyine6
6
Assemble
Assemble
Press each bar hydraulically into its handle.
Ibikoresho bikenewe:
Imashini ikanda ya hidoroli yo guteranyaIbikoresho
3- 1 as requiredUmwanya
- 1 as requiredUmwanya
- 1 as requiredUmwanya
Ibikoresho bikenewe
7- Umwanya
- Umwanya
Iki gishushanyo gikora
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