Kaʻina hana hoʻopaʻapaʻa ʻana i ka pōleʻa hoʻopaʻa metala

Ⅰ.Nānā nui

I loko o nā mea kanu wela, nā ʻōnaehana petrochemical, nā wai viscosity kiʻekiʻe i ka ʻoihana kemika lanahu, nā wai hui pū me ka lepo a me nā ʻāpana paʻa, a me nā wai ʻino loa, pono e hoʻohana nā kiwi pōleʻa i nā pahu pōpō metala paʻa paʻa, no laila e koho i ka metala paʻa paʻa. kiwi poepoe.He mea koʻikoʻi ke kaʻina hana paʻakikī o ka pōleʻa a me ka noho o ka valve ball.

Ⅱ.ʻO ke ʻano paʻakikī o ka pōleʻa a me ka noho metala paʻa i hoʻopaʻa ʻia

I kēia manawa, ʻo nā kaʻina hana hoʻopaʻapaʻa maʻamau no ka ʻili o nā metala paʻa paʻa hoʻopaʻa ʻana i nā pōlele pōlele e komo pū me kēia:

(1) Paʻa paʻa paʻa i luna (aiʻole spray welding) ma luna o ka ili o ka poepoe, hiki i ka paakiki ke piʻi aku ma mua o 40HRC, paʻakikī ke kaʻina hana o ka paʻa paʻa ma luna o ka sphere, haʻahaʻa ka hana hana, a me ka wahi nui. maʻalahi ka hoʻoheheʻe ʻana i nā ʻāpana.Hoʻohana pinepine ʻia ke kaʻina hana paʻakikī.

(2) Hoʻopili ʻia ka ʻili o ka honua me ka chrome paʻakikī, hiki i ka paʻakikī ke hiki i 60-65HRC, a ʻo ka mānoanoa he 0.07-0.10mm.ʻO ka papa chrome-plated he paʻakikī kiʻekiʻe, kūpaʻa ʻaʻahu, kūpaʻa ʻino a hiki ke mālama i ka ʻili no ka manawa lōʻihi.He mea maʻalahi ke kaʻina hana a he haʻahaʻa ke kumukūʻai.Eia naʻe, e emi koke ana ka paʻakikī o ka paʻa chrome paʻakikī ma muli o ka hoʻokuʻu ʻana o ke koʻikoʻi o loko ke piʻi ka mahana, a ʻaʻole hiki ke kiʻekiʻe kona mahana hana ma mua o 427 °C.Eia kekahi, he haʻahaʻa ka ikaika hoʻopaʻa ʻana o ka papa chrome plating, a hāʻule ka papa plating.

(3) Hoʻohana ka ʻili o ka honua i ka nitriding plasma, hiki i ka paʻakikī o ka ʻili ke hiki i 60 ~ 65HRC, a ʻo ka mānoanoa o ka papa nitride he 0.20 ~ 0.40mm.Ma muli o ka maikaʻi ʻole o ka corrosion o ka plasma nitriding treatment hardening process, ʻaʻole hiki ke hoʻohana ʻia i nā kula o ka corrosion ikaika.

(4) ʻO ke kaʻina hana supersonic spraying (HVOF) ma ka ʻili o ka pōʻai he paʻakikī a hiki i ka 70-75HRC, ka ikaika aggregate kiʻekiʻe, a me ka mānoanoa o 0.3-0.4mm.ʻO ka pulupulu HVOF ke ʻano hana nui no ka paʻakikī ʻana o ka honua.Hoʻohana nui ʻia kēia kaʻina hana paʻakikī i nā mea kanu wela, nā ʻōnaehana petrochemical, nā wai viscosity kiʻekiʻe i ka ʻoihana kemika lanahu, nā wai i hui pū ʻia me ka lepo a me nā ʻāpana paʻa, a me nā wai corrosive loa.

ʻO ke kaʻina hana hoʻoheheʻe supersonic kahi kaʻina hana i ka hoʻopau ʻana o ka wahie oxygen e hoʻopuka i ka ea holo wikiwiki e hoʻolalelale i nā ʻāpana pauka e pā i ka ʻili o ka mea e hana ai i kahi uhi ʻili.I ka wā o ke kaʻina hana, ma muli o ka wikiwiki o ka ʻāpana (500-750m / s) a me ka haʻahaʻa haʻahaʻa haʻahaʻa (-3000 ° C), hiki ke loaʻa ka ikaika hoʻopaʻa kiʻekiʻe, haʻahaʻa porosity a me ka haʻahaʻa oxide ma hope o ka paʻi ʻana i ka ʻili o ka ʻāpana. .ka uhi ʻana.ʻO ka hiʻohiʻona o ka HVOF ʻo ia ka wikiwiki o nā ʻāpana pauka alloy ma mua o ka wikiwiki o ke kani, ʻo 2 a 3 mau manawa ka wikiwiki o ke kani, a ʻo ka wikiwiki o ka lewa he 4 mau manawa o ka wikiwiki o ke kani.

ʻO ka HVOF heʻenehana hana hou,ʻo ka mānoanoa spray he 0.3-0.4mm, ka uhi a me ka mea i hoʻopaʻaʻia me ka mechanically, ke kiʻekiʻe o ka ikaika paʻa (77MPa), a he haʻahaʻa ka porosity uhi (<1%).ʻO kēia kaʻina hana he haʻahaʻa haʻahaʻa wela no nā ʻāpana (<93 ° C), ʻaʻohe deformed nā ʻāpana, a hiki ke kanu ʻia i ke anu.I ka hoʻoulu ʻana, kiʻekiʻe ka wikiwiki o ka pauka (1370m / s), ʻaʻohe wahi i hoʻopili ʻia i ka wela, ʻaʻole loli ke ʻano a me ke ʻano o nā ʻāpana, kiʻekiʻe ka paʻakikī o ka uhi, a hiki ke hana ʻia.

ʻO ka hoʻoheheʻe ʻia ʻana he hana hoʻōla wela ma luna o ka ʻili o nā mea metala.Hoʻomaʻamaʻa ia i ka pauka (pauka metala, pauka huila, pauda ceramic) i kahi kūlana i hoʻoheheʻe ʻia a kiʻekiʻe paha ma o kahi kumu wela, a laila hoʻoheheʻe ʻia e ka ea a waiho ʻia ma ka ʻili o ka ʻāpana i hana mua ʻia e hana i kahi papa me ka ili o ka hapa.(Substrate) i hui pū ʻia me kahi ʻāpana pale (weld) ikaika.

Ma ke kaʻina hana hoʻoheheʻe ʻana a me ka hoʻopaʻapaʻa ʻana i luna, ʻo ka carbide cemented a me ka substrate he kaʻina hoʻoheheʻe, a aia kahi wahi hoʻoheheʻe wela kahi e hui ai ka carbide cemented a me ka substrate.ʻO ka ʻāpana ka ʻili pili metala.Manaʻo ʻia ʻo ka mānoanoa o ka carbide cemented e ʻoi aku ma mua o 3mm ma o ka hoʻoheheʻe ʻana a i ʻole ke kau ʻana i luna.

Ⅲ. ʻO ka paʻakikī o ka ʻili pili ma waena o ka pōleʻa a me ka noho o ka pahu pōpō paʻa paʻa

Pono ke ʻano o ka ʻokoʻa paʻakikī o ka ili hoʻoheheʻe metala, inā ʻaʻole e maʻalahi ke kumu o ka hopu ʻana.Ma ka hoʻohana pono ʻana, ʻo ka ʻokoʻa paʻakikī ma waena o ka pōpō valve a me ka noho valve maʻamau ʻo 5-10HRC, kahi e hiki ai i ka valve pōpō ke loaʻa kahi ola lawelawe ʻoi aku ka maikaʻi.Ma muli o ka hana paʻakikī o ka sphere a me ke kumukūʻai hoʻoili kiʻekiʻe, i mea e pale ai i ka pōʻino mai ka pōʻino a me ka ʻaʻahu, ʻoi aku ka paʻakikī o ka pōʻai ma mua o ka paʻakikī o ka ʻili o ka noho valve.

ʻElua ʻano hui pū ʻana o ka paʻakikī i hoʻohana nui ʻia i ka paʻakikī o ka ʻili o ka pōpō valve a me ka noho valve: ①ʻO 55HRC ka paʻakikī o ka pōpō valve, a ʻo ka ili o ka noho valve he 45HRC.ʻO Alloy, ʻo kēia pāʻani paʻakikī ka pāʻani paʻakikī i hoʻohana nui ʻia no nā kiwi pōpō metala i hoʻopaʻa ʻia, hiki ke hoʻokō i nā koi maʻamau o nā kiwi pōpō metala i hoʻopaʻa ʻia;②ʻO 68HRC ka paʻakikī o ka pōpō valve, ʻo 58HRC ka ili o ka noho valve, a hiki ke hoʻopuʻi ʻia ka ʻili o ka pōpō valve me ka supersonic tungsten carbide.Hiki ke hana ʻia ka ʻili o ka noho valve me Stellite20 alloy e ka supersonic spraying.Hoʻohana nui ʻia kēia paʻakikī i ka ʻoihana kemika lanahu a loaʻa ke kūpaʻa ʻaʻahu kiʻekiʻe a me ke ola lawelawe.

Ⅳ.Epilogue

ʻO ka pōleʻa valve a me ka noho valve o ka pahu pahu paʻa paʻa paʻa paʻa i hoʻopaʻa ʻia i kahi kaʻina hana paʻakikī kūpono, hiki ke hoʻoholo pololei i ke ola lawelawe a me ka hana ʻana o ka pahu paʻa paʻa paʻa, a hiki i ke kaʻina hana paʻakikī ke hōʻemi i ke kumukūʻai hana.