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Bearing Steel Wire (52100): Drawn from Bar Through a Drawplate
Bearing balls are headed from thick wire of 52100 steel. Here 52100 bar is forged to rod and drawn through a drawplate. At 1 % carbon it is much harder than mild steel, so it is annealed soft before drawing and again after every two holes, using the 52100 anneal Verhoeven recommends.
The picture: our drawing, bar to coil.
Ilọsíwájú
2 days
Ìlànà
1
1
Forge to rod
Forge to rod
Heat the bar to a cherry-red heat and no hotter, and draw it out round on the anvil to a rod a little thicker than the drawplate's largest hole.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Ọ̀pá irin bearing (52100)1 kg
Èédú1 as requiredÀwọn irinṣẹ́ tí a nílò:
Ìléru alágbẹ̀dẹ
Ìdí Alágbẹ̀dẹ
Òòlù olórí ìtẹ̀ ìpakà
Ẹmú alágbẹ̀dẹ
Ìbọ̀wọ́ wẹ́lídìn
Gíláàsì ààbò2
2
Anneal
Anneal
In the oven, hold it at 793 °C (1460 °F) for 30 minutes, cool in the oven no faster than 500 °C an hour to 682 °C (1260 °F), then cool in air.
Àwọn irinṣẹ́ tí a nílò:
Ààrò ìtọ́jú ooru
Thermocouple pẹ̀lú ìkàẸmú alágbẹ̀dẹÌbọ̀wọ́ wẹ́lídìn3
3
Clean and taper
Clean and taper
Brush off all the scale, then file a long taper on the first 3 cm so it passes the first hole.
Àwọn irinṣẹ́ tí a nílò:
Ìṣètò búrọ́ọ̀ṣì okùn
Àkójọ Ìfá
Ìdìmú Tábìlì4
4
Wax and draw
Wax and draw
Clamp the drawplate in the vise. Wax the rod, push the taper through the first hole it does not slip through, and pull straight out with the draw tongs in one steady pull.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Ìdí Oyin20 gÀwọn irinṣẹ́ tí a nílò:
Àwo ìfàokùn irin
Ẹmú ìfàgùnÌdìmú Tábìlì
Ìbọ̀wọ́ Iṣẹ́ Awọ5
5
Anneal every two holes
Anneal every two holes
Draw through each next hole without skipping. After every two holes, coil the wire and anneal it again: hold it at 793 °C (1460 °F) for 30 minutes, cool in the oven no faster than 500 °C an hour to 682 °C (1260 °F), then cool in air.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Ìdí Oyin1 ẹyọÀwọn irinṣẹ́ tí a nílò:
Àwo ìfàokùn irinẸmú ìfàgùnÀàrò ìtọ́jú ooruThermocouple pẹ̀lú ìkà6
6
Finish soft
Finish soft
Stop at the diameter your balls need, checked with the caliper, and give the coil a last anneal so it is soft for heading.
Àwọn irinṣẹ́ tí a nílò:
Òṣùwọ̀n Kálípà Díjítà Ìnṣì 6Ààrò ìtọ́jú ooruThermocouple pẹ̀lú ìkà7
7
Troubleshooting
Troubleshooting
Bearing steel wire troubleshooting.
Flow
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