Mapangidwe apakati pa mchenga ndi gawo lofunikira kwambiri pakuponyera m'magawo oyambira, pomwe mawonekedwe owoneka bwino ndi zibowo zamkati zimapangidwa m'zigawo zachitsulo. Kumvetsetsa mitundu yosiyanasiyana ya mchenga wa mchenga, mfundo zowakhazikitsira, kukonza kwawo ndi kuyika kwawo ndikofunikira kuti apange ma castings apamwamba.
Mitundu ya Sand Cores
Miyendo yamchenga imabwera m'mitundu yosiyanasiyana, iliyonse imagwira ntchito yake popanga:
1.Dry Sand Cores: Izi zimapangidwa kuchokera ku mchenga womangidwa ndi utomoni ndikuwotcha kuti ukhale wolimba. Amagwiritsidwa ntchito popanga mawonekedwe ovuta komanso zibowo zamkati momwe zimafunikira kulondola kwapamwamba kwambiri.
2.Green Sand Cores: Izi zimapangidwa kuchokera ku mchenga wonyowa ndipo nthawi zambiri zimagwiritsidwa ntchito posavuta pomwe sikofunikira mphamvu yayikulu.
3.Mafuta a Sand Cores: Izi zimamangiriridwa ndi mafuta ndipo zimapereka kutha kwabwinoko kuposa zitsulo zamchenga zouma, zomwe zimawapangitsa kukhala abwino kwa mapulogalamu omwe amafunikira kuchotsa pachimake mosavuta.
4.Cold Box Cores: Izi zimapangidwa pogwiritsa ntchito chomangira chomwe chimaumitsa kutentha kwa chipinda, kupereka mphamvu pakati pa mphamvu ndi kuchotsa mosavuta.
5.Zithunzi za Shell Cores: Amapangidwa pogwiritsa ntchito mchenga wopaka utomoni womwe umatenthedwa kuti upange chigoba. Amapereka mapeto abwino kwambiri a pamwamba ndi kulondola kwa dimensional.
Mfundo Zoyambira za Sand Core Setting
Kuyika ma cores a mchenga moyenera ndikofunikira kuti mtundu wake ukhale wabwino. Mfundo zazikuluzikulu ndi izi:
1.Kuyanjanitsa: Miyendo iyenera kulumikizidwa molondola ndi nkhungu kuti zitsimikizire kuti miyeso yomaliza ya kuponyera ndiyolondola. Kusalongosoka kungayambitse zolakwika monga kulakwitsa ndi kusintha.
2.Kukhazikika: Miyendo iyenera kukhala yokhazikika mkati mwa nkhungu kuti zisasunthike panthawi yothira, zomwe zingayambitse kuponyera zolakwika.
3.Kutulutsa mpweya: Mpweya wolowera bwino uyenera kuperekedwa kuti mpweya utuluke panthawi yothira, kuteteza mpweya wa gasi pakuponya komaliza.
4.Thandizo: Zothandizira zokwanira ziyenera kukhalapo kuti zigwiritsire ntchito ma cores, makamaka mu nkhungu zovuta momwe ma cores angapo amagwiritsidwa ntchito.
Kukonza ndi Kuyika kwa Mchenga
Kukonza ndi kuyika kwa ma cores amchenga kumachitika kudzera m'njira zosiyanasiyana kuti zitsimikizire kuti zimakhalabe m'malo poponya:
1.Zosindikiza za Core: Izi ndi zowonjezera za nkhungu zomwe zimasunga pachimake. Amapereka njira zamakina zokonzera pachimake ndikuwonetsetsa kulumikizana.
2.Chaplets: Izi ndi zothandizira zitsulo zazing'ono zomwe zimagwira pachimake. Amapangidwa kuti aziphatikizana ndi chitsulo chosungunula, kukhala gawo la kuponya komaliza.
3.Mabokosi a Core: Izi zimagwiritsidwa ntchito popanga zitsulo zamchenga ndikuwonetsetsa kuti zikwanira bwino mkati mwa nkhungu. Mapangidwe a bokosi lapakati ayenera kuwerengera kuchepa ndi kufalikira kwa mchenga.
Negative Cores
Negative cores, kapena core negatives, amagwiritsidwa ntchito popanga ma undercuts kapena zinthu zamkati zomwe sizingapangidwe ndi ma cores wamba. Amapangidwa kuchokera ku sera kapena zinthu zina zomwe zimatha kuchotsedwa pambuyo poponya. Mapangidwe a ma cores olakwika amafunika kuganiziridwa mosamala kuti atsimikizire kuti akhoza kuchotsedwa mosavuta popanda kuwononga kuponyera.
Venting, Assembly, ndi Pre-Assembly of Sand Cores
1.Kutulutsa mpweya: Kutulutsa mpweya moyenera ndikofunikira kuti mpweya wotuluka panthawi yothira utuluke. Ma venti amatha kupangidwa mkati mwapakati kapena kuwonjezeredwa ngati zigawo zosiyana. Kusatulutsa mpweya wokwanira kungayambitse kuphulika kwa gasi ndi zina zowonongeka.
2.Msonkhano: Mu zisankho zovuta, ma cores angapo angafunikire kusonkhanitsidwa kuti apange mawonekedwe omaliza. Izi zimafuna kuyanjanitsa bwino ndi kukonza kuti ma cores agwirizane bwino. Ma jigs ndi ma fixtures nthawi zambiri amagwiritsidwa ntchito kuthandizira izi.
3.Pre-Assembly: Kusonkhanitsa koyambirira kunja kwa nkhungu kumatha kuwongolera kulondola ndikuchepetsa nthawi yokhazikitsa. Izi zimaphatikizapo kusonkhanitsa ma cores kukhala gawo limodzi musanawaike mu nkhungu. Pre-assembly ndi yothandiza makamaka pazitsulo zazikulu kapena zovuta zomwe zimakhala zovuta kuzigwira payekha.
Nthawi yotumiza: Oct-31-2024