laboratornaya rabota - 5

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laboratornaya rabota - 5 sushka form i sterjney tsel raboti: izuchit metodi sushki form i sterjney. operatsiya sushki uvelichivaet prodoljitelnost texnologicheskogo tsikla izgotovleniya otlivok, poetomu stremyatsya vesti sushku sterjney i form s maksimalnoy skorostyu. skorost sushki opredelyaetsya temperaturoy nagreva. chem vishe temperatura sushki, tem bolshe skorost ispareniya vlagi s poverxnosti form i sterjney, tem bistree idut protsessi otverdevaniya svyazuyushix i tem menshe prodoljitelnost sushki. odnako, dlya preduprejdeniya razrusheniya svyazuyushix temperaturu sushki nelzya povishat bespredelno. temperatura sushki form doljna bit nije temperaturi, pri kotoroy glina teryaet svyazuyushuyu sposobnost, t.e. nije 400 °s. na praktike temperatura sushki form redko previshaet 350 °s. temperatura sushki sterjney opredelyaetsya prirodoy svyazuyushego. minimalnuyu temperaturu sushki imeyut sterjni, izgotovlennie na patoke ili kanifoli; maksimalnuyu — na gline. dlitelnost sushki zavisit ot tolshini stenok formi i sterjnya, vlajnosti smesi i gazovoy sredi, a takje ot stepeni uplotneniya formi. chem tolshe stenki form i massivnee sterjni, tem prodoljitelnee sushka …

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formi. vtoroy etap sushki sostoit v bistrom pod'eme temperaturi formi (sterjnya) do maksimalnogo urovnya i viderjke pri dannoy temperature v techenie neobxodimogo vremeni. vlajniy vozdux v etot period udalyaetsya iz sushila i poverxnost form (sterjney) obduvaetsya goryachimi suximi gazami. po mere ispareniya vlagi temperatura sterjnya (formi) povishaetsya do temperaturi pechnix gazov; v svyazuyushix proisxodyat neobxodimie izmeneniya (okislenie, plavlenie, obezvojivanie), povishayushie prochnost form i sterjney. tretiy etap sushki zaklyuchaetsya v otnositelno medlennom oxlajdenii suxix form (sterjney) do temperaturi 50-70 °s, pri kotoroy oni izvlekayutsya iz pechi. umenshenie skorosti oxlajdeniya pozvolyaet predupredit rastreskivanie poverxnostnix sloev sterjnya i ix osipanie, no uvelichivaet prodoljitelnost protsessa. ris. 1. sxema ustanovki dlya poverxnostnoy podsushki form: 1 — topka; 2 — otverstie dlya podvoda dopolnitelnogo vozduxa; 3 — raspredelitelnaya kamera; 4 — otverstie; 5 — shiber; 6 — polost formi v nekotorix sluchayax net neobxodimosti proizvodit sploshnuyu sushku form. visokoe kachestvo otlivok obespechivaetsya i togda, kogda formi …

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mi mogut uspeshno konkurirovat s perenosnimi sushilami. podsushka form infrakrasnimi luchami uspeshno primenyaetsya v krupnoseriynom proizvodstve. sushku form v bolshinstve sluchaev osushestvlyayut v kamernix pechax periodicheskogo deystviya. progressivnim sposobom yavlyaetsya sushka form pod povishennim davleniem. sushnost etogo sposoba sostoit v tom, chto v germetichno zakrituyu liteynuyu formu cherez polost pribili nagnetayut goryachiy vozdux pod davleniem 600-700 mm vod. st. proxodya cherez sloy uplotnennoy formovochnoy smesi, goryachiy vozdux visushivaet formu. etot sposob v 3-5 raz bolee proizvoditelen, chem sushka v pechax periodicheskogo deystviya, trebuet menshego rasxoda energii, isklyuchaet peregrev poverxnosti formi i delaet nenujnim nablyudenie za sushkoy. sushku sterjney osushestvlyayut v kamernix pechax periodicheskogo deystviya ili v konveyernix pechax neprerivnogo deystviya. kamernie pechi primenyayut v tsexax edinichnogo i melkoseriynogo proizvodstva, a konveyernie — v krupnoseriynom i massovom proizvodstvax. ris. 3. sxema sushki sterjney tokami visokoy chastoti: 1 — sterjen; 2 — elektrod; 3 — metallicheskaya plita na lente transportera ris. 2. …

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oden dlya sushki ploskix sterjney, izgotovlennix iz bezmaslyannix smesey. ravnomernost progreva sterjnya, sokrashenie tsikla sushki, umenshenie rasxoda energii, uluchshenie usloviy truda — takovi osnovnie dostoinstva etogo sposoba sushki pered drugimi. image1.png image2.png image3.png

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laboratornaya rabota - 5 sushka form i sterjney tsel raboti: izuchit metodi sushki form i sterjney. operatsiya sushki uvelichivaet prodoljitelnost texnologicheskogo tsikla izgotovleniya otlivok, poetomu stremyatsya vesti sushku sterjney i form s maksimalnoy skorostyu. skorost sushki opredelyaetsya temperaturoy nagreva. chem vishe temperatura sushki, tem bolshe skorost ispareniya vlagi s poverxnosti form i sterjney, tem bistree idut protsessi otverdevaniya svyazuyushix i tem menshe prodoljitelnost sushki. odnako, dlya preduprejdeniya razrusheniya svyazuyushix temperaturu sushki nelzya povishat bespredelno. temperatura sushki form doljna bit nije temperaturi, pri kotoroy glina teryaet svyazuyushuyu sposobnost, t.e. nije 400 °s. na praktike temperatura sushki form redko previshaet 350 °s. tem...

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