Ma roll bearing ndi zigawo zazikulu zomwe zimagwiritsidwa ntchito kwambiri mu uinjiniya wamakina, ndipo magwiridwe antchito awo amakhudza mwachindunji kudalirika kwa makina onse. Kuyesa kuuma kwa zigawo zozungulira ndi chimodzi mwa zizindikiro zotsimikizira magwiridwe antchito ndi chitetezo. Miyezo Yapadziko Lonse ya ISO 6508-1″ Njira Zoyesera za Kuuma kwa Zigawo Zozungulira” imafotokoza zofunikira zaukadaulo poyesa kuuma kwa zigawo, kuphatikiza izi:
1. Zofunikira za kuuma kwa ziwalo zogwirira ntchito pambuyo pozizira;
1） Chitsulo chonyamula chromium chapamwamba kwambiri (GCr15 mndandanda):
Kuuma pambuyo pa kutentha nthawi zambiri kumafunika kukhala pakati pa 60 ~ 65 HRC (Rockwell hardness C sikelo)；
Kuuma kocheperako sikuyenera kukhala kotsika kuposa 60 HRC; apo ayi, kukana kwa kutopa sikudzakhala kokwanira, zomwe zimapangitsa kuti kuvulala kuyambe msanga;
Kulimba kwakukulu sikuyenera kupitirira 65 HRC kuti zinthuzo zisawonongeke kwambiri, zomwe zingayambitse kusweka pamene zinthuzo zikugwedezeka.
2） Zipangizo zogwirira ntchito zapadera (monga chitsulo chonyamula mafuta, chitsulo chonyamula kutentha kwambiri):
Chitsulo chonyamula zinthu chopangidwa ndi carburi (monga 20CrNiMo): Kuuma kwa gawo lopangidwa ndi carburi pambuyo pa kutentha nthawi zambiri kumakhala 58 ~ 63 HRC, ndipo kuuma kwa pakati kumakhala kochepa (25 ~ 40 HRC), komwe kumagwirizanitsa kukana kwa pamwamba ndi kulimba kwa pakati;
Chitsulo chonyamula zinthu zotentha kwambiri (monga Cr4Mo4V): Pambuyo potenthetsa pamalo otentha kwambiri, kuuma kwake nthawi zambiri kumakhalabe pa 58~63 HRC kuti kukwaniritse zofunikira pakukana kutopa pa kutentha kwakukulu.
2. Zofunikira za kuuma kwa ziwalo zonyamula pambuyo pa kutentha kwambiri;
Mpikisano wa 200°C 60 – 63HRC Mpira wachitsulo 62 – 66HRC Roller 61 – 65 HRC
225°C Msewu wa Mpikisano 59 – 62HRC Mpira wa Chitsulo 62 – 66HRC Roller 61 – 65 HRC
Mpikisano wa 250°C 58 – 62HRC Mpira wachitsulo 58 – 62HRC Roller 58 – 62 HRC
Mpikisano wa 300°C 55 – 59HRC Mpira wachitsulo 56 – 59HRC Roller 55 – 59 HRC
3. Zofunikira zazikulu za zitsanzo zoyesedwa poyesa kuuma, komanso zofunikira zosiyanasiyana zoyesera monga kusankha njira zoyesera kuuma, mphamvu yoyesera, ndi malo oyesera.
1） Mphamvu zoyesera za Rockwell hardness tester: 60kg, 100kg, 150kg (588.4N, 980.7N, 1471N)
Mphamvu yoyesera ya Vickers hardness tester ndi yayikulu kwambiri: 10g ~ 100kg (0.098N ~ 980.7N)
Mphamvu yoyesera ya Leeb hardness tester: Mtundu D ndiye njira yodziwika kwambiri yogwiritsira ntchito mphamvu yoyesera (mphamvu yokhudza), yoyenera ziwalo zambiri zachitsulo
2） Onani chithunzi chomwe chili pansipa kuti mudziwe njira yoyesera
| Nambala ya seri | mfundo za gawo | Njira yoyesera | Ndemanga |
| 1 | D< 200 | HRA,HRC | HRC ndiyo yofunika kwambiri |
| bₑ≥1.5 | |||
| Dw≥4.7625~60 | |||
| 2 | bₑ<1.5 | HV | Ikhoza kuyesedwa mwachindunji kapena mutakhazikitsa |
| Dw<4.7625 | |||
| 3 | D ≥ 200 | HLD | Ziwalo zonse zozungulira zomwe sizingayesedwe kuuma pa choyesera cha kuuma kwa benchtop zitha kuyesedwa ndi njira ya Leeb |
| bₑ ≥ 10 | |||
| Dw≥ 60 | |||
| Chidziwitso: Ngati wogwiritsa ntchito ali ndi zofunikira zapadera pa mayeso a kuuma, njira zina zitha kusankhidwa kuti ayesere kuuma. | |||
| Nambala ya seri | Njira yoyesera | Gawo lofotokozera/mm | Mphamvu yoyesera/N |
| 1 | HRC | bₑ ≥ 2.0, Dw≥ 4.7625 | 1471.0 |
| 2 | HRA | bₑ > 1.5 ~ 2.0 | 588.4 |
| 3 | HV | bₑ > 1.2 ~ 1.5, Dw≥ 2.0 ~ 4.7625 | 294.2 |
| 4 | HV | bₑ > 0.8 ~ 1.2, Dw≥ 1 ~ 2 | 98.07 |
| 5 | HV | bₑ > 0.6 ~ 0.8, Dw≥ 0.6 ~ 0.8 | 49.03 |
| 6 | HV | bₑ < 0.6, Dw< 0.6 | 9.8 |
| 7 | HLD | bₑ ≥ 10, Dw≥ 60 | 0.011 J (Joule) |
Kuyambira pomwe idakhazikitsidwa mu 2007, njira zoyesera zomwe zafotokozedwa mu muyezo zakhala zikugwiritsidwa ntchito kwambiri pakulamulira bwino njira zopangira m'mabizinesi opanga zinthu zonyamula katundu.
Nthawi yotumizira: Ogasiti-20-2025
