Ukuhlolisisa ukuphoswa kwamavalvu

1. Kuyini ukuphosa

Insimbi ewuketshezi ithululelwa emgodini wesikhunta ngejamo elifanele ingcenye, begodu ngemva kobana iqine, kutholakala umkhiqizo wengcenye onejamo elithileko, ubukhulu kanye nekhwalithi yendawo, okubizwa ngokuthi kuphosa. Izinto ezintathu eziqakathekileko: ingxubevange, ukumodela, ukuthulula nokuqinisa. Inzuzo ekulu: iingcenye eziyinkimbinkimbi zingabunjwa.

2. Ukuthuthukiswa kokuphosa

Ukukhiqiza kwathoma ngeminyaka yabo-1930 kusetjenziswa imitjhini yomoya kanye neenkambo zesihlabathi sobumba.

Umhlobo wesihlabathi sesimende wavela ngo-1933

Ngo-1944, kwavela umhlobo wegobolondo lesihlabathi elibandako eliqinileko

I-CO2 eqinileko yamanzi engilazi yesihlabathi yavela ngo-1947

Ngo-1955, kwavela umhlobo wegobolondo lesihlabathi le-resin

Ngo-1958, i-furan resin no-bake sand mold yavela

Ngo-1967, kwavela isikhunta sesihlabathi sokugeleza kwesamente

Ngo-1968, ingilazi yamanzi ene-organic hardener yavela

Eminyakeni ema-50 edlulileko, iindlela ezitjha zokwenza ama-mold wokuphosa ngeendlela ezibonakalako, ezifana: nokubumba ama-pellet wamazibuthe, indlela yokubumba ngokuvala nge-vacuum, ukubumba nge-foam elahlekileko, njll. Iindlela ezihlukahlukeneko zokuphosa ezisekelwe kuma-mold wensimbi. Njengokuphosa nge-centrifugal, ukuphosa ngegandelelo eliphezulu, ukuphosa ngegandelelo eliphasi, ukukhipha nge-liquid, njll.

3. Iimpawu zokuphosa

A. Ukutjhuguluka okukhulu nokutjhuguluka. Yonke imikhiqizo yensimbi. Ukuphosa akukhawulelwa budisi, ubukhulu kanye nobujamo bengcenye. Ubunzima bungaba kusuka kumagremu ambalwa ukuya kumakhulu wamathani, ukujiya kweboda kungaba kusuka ku-0.3mm ukuya ku-1m, begodu ijamo lingaba ziingcenye eziyinkimbinkimbi khulu.

B. Inengi lezinto ezisetjenziswako ezisetjenziswako ezisetjenziswako zitholakala eendaweni ezinengi begodu zitjhiphile, njengensimbi elahliweko nesihlabathi.

C. Ukuphosa kungenza ngcono ukunemba kwemilinganiso kanye nekhwalithi yendawo yokuphosa ngokusebenzisa ithekhnoloji yokuphosa ethuthukileko, ukwenzela bona iingcenye zingasikwa kancani begodu ngaphandle kokusikwa.