Ngaphantsi kweemeko eziqhelekileyo, ukuchaneka kwe-dimensional ye-precision castings kuchaphazeleka kwizinto ezininzi ezifana nesakhiwo sokuphosa, izinto zokuphosa, ukwenza i-mold, ukwenza i-shell, ukubhaka, ukugalela, njl njl. Nasiphi na isilungiselelo okanye ukusebenza ngokungekho ngqiqweni kwanoma yiyiphi ikhonkco kuya kutshintsha izinga le-shrinkage ye-casting. Oku kukhokelela ekuphambukeni kokuchaneka komgangatho wokusaswa kwiimfuno. Oku kulandelayo yimiba enokubangela iziphene ekuchanekeni kwedimensional ye-casts echanekileyo:
(1) Impembelelo yesakhiwo sokubunjwa: a. Ubunzima bodonga lokuphosa, isantya esikhulu sokushwabana, udonga olucekethekileyo lokuphosa, isantya esincinci sokushwabana. b. Ireyithi yokuncipha yasimahla inkulu, kwaye izinga lokucutheka elithintelweyo lincinci.
(2) Impembelelo yezinto ezibunjiweyo: a. Ukuphakama komxholo wekhabhoni kwizinto eziphathekayo, umncinci umlinganiselo wokunciphisa umgca, kunye nomxholo wekhabhoni ophantsi, umlinganiselo omkhulu wokunciphisa umgca. b. Isantya sokunciphisa izinto eziqhelekileyo zilandelayo: ukuphosa izinga lokunciphisa K = (LM-LJ) / LJ × 100%, i-LM ubukhulu becavity, kunye ne-LJ ubukhulu bokuphosa. I-K ichatshazelwa zezi zinto zilandelayo: i-wax mold K1, i-casting structure i-K2, uhlobo lwe-alloy K3, ubushushu obuthululwayo be-K4.
(3) Impembelelo yokwenziwa komngundo kumyinge wokucutheka komgca wokubunjwa: a. Impembelelo yokushisa kwe-wax injection, uxinzelelo lwe-wax injection, kunye noxinzelelo lokubamba ixesha kwisayizi yotyalo-mali yeyona nto ibonakalayo kwiqondo lokushisa kwe-wax, ilandelwa yi-injection ye-wax, kunye nexesha lokubamba uxinzelelo liqinisekisiwe Emva kokuba utyalo-mali lwenziwe, lunempembelelo encinci kubungakanani bokugqibela botyalo-mali. b. Izinga lokunciphisa umgca we-wax (mold) impahla malunga ne-0.9-1.1%. c. Xa isikhunta sotyalo-mali sigcinwa, kuya kubakho ukuncipha ngakumbi, kwaye ixabiso layo le-shrinkage li malunga ne-10% ye-shrinkage epheleleyo, kodwa xa igcinwe kwiiyure ze-12, ubukhulu be-mold mold buzinzile. d. Umyinge wokucutheka kweradial we-wax mold yi-30-40% kuphela yereyithi yokucutheka ngobude. Iqondo lobushushu benaliti yewax linempembelelo enkulu kakhulu kwisantya sokushwabana sasimahla kunesantya sokushwabana esithintelweyo (elona qondo lobushushu lihle lokutofa yi-57-59℃, Ukuba liphezulu iqondo lobushushu, kokukhona ukushwabana okukhulu).
(4) Impembelelo yezinto zokwenza igobolondo: isanti ye-zircon, i-zircon powder, isanti ye-Shangdian kunye ne-Shangdian powder zisetyenziswa. Ngenxa ye-coefficient yabo encinci yokwandisa, kuphela i-4.6 × 10-6 / ℃, ayinakuhoywa.
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(6) Impembelelo yobushushu bokuphosa: ngokukhona iqondo lobushushu liphezulu, kokukhona ukuncipha kwesantya, kwaye okukhona lisezantsi iqondo lobushushu lokugalela, kokukhona lisiba lincinci izinga lokushwabana, ngoko ke ubushushu bokuphosa kufuneka bufaneleke.
Ixesha lokuposa: Nov-15-2021