Ukwenziwa kobunjwa beqokobheyinkqubo apho isanti exutywe nentlaka ye-thermosetting ivunyelwe ukuba idibane neplate yepateni yesinyithi eshushu, ukuze iqokobhe elibhityileyo neliqinileyo lokungunda lenziwe lijikeleze i-pattem. Emva koko igobolondo iyasuswa kwipatheni kwaye i-cope kunye ne-drag isuswe kunye kwaye igcinwe kwi-flask kunye nezinto eziyimfuneko zokubuyisela kunye nentsimbi etyhidiweyo igalelwe kwi-mold.
Ngokuqhelekileyo, isanti eyomileyo necolekileyo (i-90 ukuya kwi-140 GFN) ekhululekile ngokupheleleyo kudongwe isetyenziselwa ukulungiselela isanti yokubumba iqokobhe. Ubungakanani beenkozo ezikhethiweyo buxhomekeke kwisiphelo somphezulu ofunekayo ekugaleleni. Ukucolwa kakhulu ubungakanani beenkozo kufuna isixa esikhulu sentlaka, nto leyo eyenza ukuba ukungunda kubize kakhulu.
Iireyini zokwenziwa ezisetyenziswa ekubumbeni iqokobhe ngokwesiseko ziiresina zokubeka i-thermosetting, ezithi zibe lukhuni ngokungenakujikwa bubushushu. Iireyini ezisetyenziswa kakhulu zii-phenol formaldehyde resins. Xa zidibene nesanti, zinamandla aphezulu kakhulu kunye nokuchasana nobushushu. I-phenolic resins ezisetyenziswa ekubumbeni iqokobhe zihlala ziziindidi ezimbini, oko kukuthi, i-resin ine-phenol engaphezulu kwaye isebenza njengesixhobo se-thermoplastic. Ngexesha lokugquma ngesanti i-resin idityaniswe ne-catalyst efana ne-hexa methylene tetramine (hexa) ngomlinganiselo omalunga ne-14 ukuya kwi-16% ukwenzela ukuphuhlisa iimpawu ze-thermosetting. Iqondo lobushushu lokunyanga kwezi zinto liya kuba malunga ne-150 C kwaye ixesha elifunekayo liya kuba yimizuzwana engama-50 ukuya kuma-60.
Izinto eziluncedo zeNkqubo yokuCasa i-Shell Mold
1.Ukubunjwa kweqokobhezichanekile ngokubanzi kunokwakheka kwesanti. Kunokwenzeka ukuba ufumane ukunyamezela kwe-+0.25 mm ye-castings yensimbi kunye +0. I-35 mm ye-grey cast iron castings kunyei-ductile iron castingsphantsi kweemeko eziqhelekileyo zokusebenza. Kwimeko yokubumba iqokobhe esondeleleneyo, umntu unokuyifumana kuluhlu lwe +0.03 ukuya +0.13 mm kwizicelo ezithile.
2. Umphezulu ogudileyo unokufumaneka kwi-shell castings. Oku kuphunyezwa ikakhulu ngobungakanani obucolekileyo obusetyenziswayo. Uluhlu oluqhelekileyo loburhabaxa luyi-odolo ye-3 ukuya kwi-6 microns.
3. Ii-engile zokuyila, ezingaphantsi kune ukuchithwa kwesanti, ziyafuneka kwiimbumba zeqokobhe. Ukuncitshiswa kwee-angles eziqulunqiweyo kunokusuka kwi-50 ukuya kwi-75%, egcina kakhulu iindleko zempahla kunye neendleko zomatshini ezilandelayo.
4. Ngamanye amaxesha, ii-cores ezikhethekileyo zinokukhutshwa ekubunjweni kweqokobhe. Kuba isanti inamandla aphezulu ukungunda kunokuyilwa ngendlela yokuba imingxunya yangaphakathi yenziwe ngokuthe ngqo kunye nesidingo semiqolo yeqokobhe.
5. Kwakhona, amacandelo amancinci kakhulu (ukuya kwi-0.25 mm) yohlobo lweentloko ze-cylinder ezipholileyo zomoya zingenziwa ngokulula ngokubumba igobolondo ngenxa yamandla aphezulu entlabathi esetyenziselwa ukubumba.
6. Ukunyanzeliswa kwegobolondo kuphezulu kwaye ngoko akukho kufakwa kwegesi okwenzekayo.
7. Isanti encinci kakhulu kufuneka isetyenziswe.
8. Umatshini unokwenzeka ngokulula ngenxa yokulungiswa okulula okubandakanyekayo ekubumbeni iqokobhe.
Unyino lweNkqubo yokuCalwa kokungunda kwiqokobhe
1. Iipateni zibiza kakhulu kwaye ngoko zinoqoqosho kuphela xa zisetyenziswa kwimveliso enkulu. Kwisicelo esiqhelekileyo, ukubumba iqokobhe kuye kuqoqosho ngaphezulu kokubumba isanti ukuba imveliso efunekayo ingaphezulu kwamaqhekeza angama-15000 ngenxa yexabiso eliphezulu lepatheni.
2. Ubungakanani bokubunjwa obufunyenwe ngokubunjwa kweqokobhe bukhawulelwe. Ngokubanzi, ukujula okunobunzima obuya kuthi ga kwi-200 kg kunokwenziwa, nangona kuncinci, ukubunjwa ukuya kuthi ga kubunzima be-450 kg kuyenziwa.
3. Iimilo ezinobunzima kakhulu azinakufunyanwa.
4. Izixhobo ezinobunkunkqele ziyafuneka ekuphatheni i-shell moldings ezifana nezo zifunekayo kwiipateni zetsimbi ezifudumalayo.
Ixesha lokuposa: Dec-25-2020