Mushonga wekupisa wemakemikari wesimbi castings inoreva kuisa ma castings munzvimbo inoshanda pane imwe tembiricha kuitira kuchengetedza kupisa, kuti chimwe kana akati wandei chemakemikari apinde pamusoro. Kemikari kupisa kurapwa kunogona kushandura chimiro chemakemikari, metallographic chimiro uye mechanical zvimiro zvepamusoro pekukanda. Inowanzo shandiswa kemikari kupisa kurapwa maitiro anosanganisira carburizing, nitriding, carbonitriding, boronizing uye metalizing. Paunenge uchiita kemikari kupisa kupisa pakukanda, chimiro, saizi, mamiriro epamusoro, uye kupisa kwepamusoro kurapwa kwekukanda kunofanirwa kutariswa zvizere.
1. Carburizing
Kupisa (Carburizing) zvinoreva kudziyisa nekudziisa kukanda munzvimbo yekuviga, uyezve kupinza kabhoni maatomu pamusoro. Chinangwa chikuru che carburizing ndechekuwedzera kabhoni yemukati pamusoro pekukanda, uku uchigadzira imwe kabhoni yemukati gradient mukukanda. Iyo kabhoni yemukati me carburizing simbi inowanzo 0.1% -0.25% kuve nechokwadi chekuti musimboti wekukanda une kuoma uye simba rakakwana.
Kuoma kwepamusoro kweiyo carburized layer inowanzo 56HRC-63HRC. Iyo metallographic chimiro cheiyo carburized layer yakanaka tsono martensite + shoma shoma yakachengetwa austenite uye yakagovaniswa granular carbides. Network carbides haibvumidzwe, uye chikamu chevhoriyamu cheakachengetwa austenite kazhinji hachipfuure 15% -20%.
Iko kuomarara kwepakati kwekukanda mushure mekuviga carburizing kazhinji 30HRC-45HRC. Iyo yakakosha metallographic chimiro inofanirwa kuve yakaderera-kabhoni martensite kana yakaderera bainite. Hazvibvumirwi kuva neferrite yakakura kana yakanaya pamwe chete nemuganho wezviyo.
Mukugadzirwa chaiko, kune matatu akajairwa nzira dzekuviga: yakasimba carburizing, fluid carburizing uye gasi carburizing.
2. Nitriding
Nitriding inoreva nzira yekurapa kupisa iyo inopinza maatomu enitrogen pamusoro pekukanda. Nitriding inowanzoitwa pazasi peAc1 tembiricha, uye chinangwa chayo chikuru ndechekuvandudza kuomarara, kupfeka kuramba, simba rekuneta, kubatwa nekubata uye kupikisa kwemuchadenga corrosion yenzvimbo yekukanda. Nitriding yesimbi castings inowanzoitwa pa480°C-580°C. Kukandwa kuine aruminiyamu, chromium, titanium, molybdenum, uye tungsten, senge simbi yakaderera alloy, simbi isina tsvina, uye inopisa mold simbi, akakodzera nitriding.
Kuti ive nechokwadi chekuti musimboti wekukanda une inodiwa michina zvimiro uye metallographic chimiro, uye kuderedza deformation mushure me nitriding, pre-kurapwa pamberi nitriding inodiwa. Kune simbi yekugadzira, kudzima uye kupisa kurapwa kunodiwa pamberi penitriding kuitira kuti uwane yunifomu uye yakanakisa tempered sorbite chimiro; kune castings izvo zviri nyore kukanganisa panguva yekurapa nitriding, kushushikana kunetseka annealing kurapwa kunodiwawo mushure mekudzima uye kupisa; yesimbi isina tsvina uye Heat-resistant simbi castings inogona kazhinji kudzimwa nekudzikamiswa kuvandudza chimiro uye simba; kune austenitic simbi isina tsvina, mhinduro yekupisa kurapwa inogona kushandiswa.
Nguva yekutumira: Jul-21-2021