Ukucutheka kwiicastings ngumba obalulekileyo ochaphazela kakhulu umgangatho kunye nemfezeko yemveliso yokugqibela. Ukuqonda iintlobo ezahlukeneyo zokucutheka ezinxulumene nezixhobo ezahlukeneyo, njenge intsimbikwayeJula i-ayini, kunye nezinto ezinegalelo kwiziphene ezifana nokushwabana kwemingxuma kunye neentanda ezishushu, zibalulekile kwimisebenzi yokuphosa esebenzayo.
Ukushwabana kwintsimbi yeCast kunye neCast iron
Xa kuxoxwa ngokuncipha, kubalulekile ukwahlula phakathi kwezinto ezimbini eziphambili ezisetyenziselwa ukuphosa:intsimbikwayeJula i-ayini. Zombini izixhobo zibonisa ukucutheka, kodwa iindlela kunye namaxabiso anokwahluka.
Intsimbi yentsimbi idla ngokuba nokuncipha okupheleleyo malunga1.5% ukuya kwi-2%ukusuka kwimo etyhidiweyo ukuya kwimo eyomeleleyo. Oku kucutheka kubangelwa ikakhulu kukuncipha kwe-thermal yezinto njengoko ipholile. Ngokwahlukileyo, intsimbi etyhidiweyo inezinga eliphezulu lokucutheka, ngokubanzi2% ukuya kwi-3%. I-shrinkage eyongezelelweyo kwi-iron cast inokuthi ifakwe ekubunjweni kwayo, okubandakanya umxholo ophezulu wekhabhoni ochaphazela ukuziphatha kwayo kokuqina.
Okwenyani Ukucutheka kokuCasa
Okwenyani ukushwabana kubhekiselele kutshintsho olupheleleyo lwedimensional efunyanwa kukuphosa ukusuka kwimo yolwelo ukuya kwimo eqinileyo yokugqibela. Oku kunokubandakanya zombini i-shrinkage ye-volumetric ngexesha lokupholisa kunye nemiphumo yokuqina. Uyilo olufanelekileyo kunye nokubalwa kwejometri yokuphosa kubalulekile ukulungiselela oku kuncitshiswa, njengoko ukungaphumeleli ukwenza oko kunokukhokelela ekungalungi kwe-dimensional kunye neempawu zoomatshini eziphazamisayo.
I-Shrinkage Cavities kunye ne-Porosity
I-shrinkage cavities, eyaziwa ngokuba yi-shrinkage voids, iyenzeka xa isinyithi solwelo sisilela ukuzalisa ukungunda ngenxa yokungondleki ngokwaneleyo ngexesha lokuqina. Lo mcimbi unokukhokelela kumanqaku abuthathaka ekugayweni, okwenza kube lula ukungaphumeleli phantsi komthwalo. Ngakolunye uhlangothi, i-porosity-ehlala ibonwa kwi-castings-ikakhulukazi ibangelwa ukuvalelwa kwegesi okanye iindlela zokugalela ezingafanelekanga, ezinokunciphisa ngakumbi ukunyaniseka kwesakhiwo.
I-Hot Cracking kunye ne-Casting Stresses
Iintanda ezishushu yenye inkxalabo ebalulekileyo ekujuleni. Oku kwenzeka xa ukuphosa kusekho kumaqondo obushushu aphezulu kodwa sele iqalisile ukuqina. Uxinzelelo oluye lwenziwa ngexesha lokupholisa lunokugqithisa amandla ezinto eziphathekayo, okukhokelela ekuqhekekeni. Ukulawula izinga lokupholisa kunye nokuqonda iimpawu ze-thermal eziphathekayo kunokunceda ukunciphisa umngcipheko wokuqhekeka okushushu.
Ukuqhekeka okubandayo kunye nokuguqulwa
Ukuqhekeka okubandayo kwenzeka emva kokuba ukuphosa kupholile kwiqondo lobushushu begumbi kwaye kaninzi kuba sisiphumo soxinzelelo olushiyekileyo. Olu xinzelelo lunokuvela ngenxa yokupholisa okungalinganiyo, okukhokelela ekucuthekeni kokwahluka kulo lonke ixesha lokusa. Uxinzelelo olunjalo lusenokubangela ukuguquka, kube nefuthe kwimilo yokugqibela yecasting kunye nokusebenziseka.
Ukunciphisa ukubakho kokuqhekeka okubandayo kunye nokuguqulwa, kubalulekile ukuphumeza iindlela zokupholisa ezifanelekileyo kunye neenkqubo zokunciphisa uxinzelelo ngexesha nasemva kwenkqubo yokuphosa.
Ixesha lokuposa: Oct-25-2024