Mumamiriro ezvinhu akajairika, kururamisa kwedimensional ye-precision castings kunokonzerwa nezvinhu zvakawanda zvakadai sekukanda maitiro, kukanda zvinhu, kugadzira mold, kugadzira shell, kubika, kudurura, nezvimwewo. Chero kugadzirisa kana kushanda kusina musoro kwechibatanidza chero chipi zvacho chichashandura shrinkage rate yekukanda. Izvi zvinotungamira mukutsauswa mukurongeka kwedimensional yekukanda kubva kune zvinodiwa. Izvi zvinotevera zvinhu zvinogona kukonzera kukanganisa mukurongeka kwedimensional yekukandwa chaiko:
(1) Pesvedzero yemaitiro ekukanda: a. Kukanda madziro ukobvu, yakakura shrinkage rate, nhete yekukanda madziro, diki shrinkage rate. b. Iyo yemahara shrinkage rate yakakura, uye iyo inodziviswa shrinkage mwero idiki.
(2) Pesvedzero yezvinokandwa: a. Iyo yakakwira iyo kabhoni yemukati mune izvo, iyo diki iyo mutsara shrinkage mwero, uye yakadzikira iyo kabhoni yemukati, iyo yakakura mutsara shrinkage rate. b. Iyo yekukanda shrinkage rate yezvinhu zvakajairika ndeiyi: kukanda shrinkage rate K=(LM-LJ)/LJ×100%, LM ndiyo saizi yegomba, uye LJ ndiyo saizi yekukanda. K inobatwa nezvinhu zvinotevera: wax mold K1, casting structure K2, alloy type K3, kudira tembiricha K4.
(3) Pesvedzero yekugadzira mold pane mutsara shrinkage mwero wekukanda: a. Kurudziro yetembiricha yejekiseni rewakisi, kudzvanywa kwejekiseni rewakisi, uye kumanikidza kubata nguva pahukuru hwekudyara ndiyo inonyanya kuoneka mukupisa kwejekiseni rewakisi, inoteverwa nekudzvanywa kwejekiseni rewakisi, uye kudzvanywa kwekubata nguva kunovimbiswa Mushure mekudyara kwagadzirwa, haina mhedzisiro pahukuru hwekupedzisira hwekudyara. b. The linear shrinkage rate of wax (mold) material inenge 0.9-1.1%. c. Kana iyo mold yekudyara ichichengetwa, pachava nekumwe shrinkage, uye kukosha kwayo kwe shrinkage inenge 10% yehupamhi hwese, asi kana yakachengetwa kwemaawa gumi nemaviri, saizi yekudyara yakagadzikana. d. Radial shrinkage rate yewakisi mold ingori 30-40% yehurefu hwekuderera. Tembiricha yejekiseni rewakisi ine simba rakakura kwazvo pakukura kwemahara pane kuderedzwa kwemazinga (tembiricha yakanakisa yemajekiseni i57-59 ℃, Kukwirisa tembiricha, ndiko kukura kuderera).
(4) Pesvedzero yezvigadzirwa zvekugadzira goko: jecha zircon, zircon powder, Shangdian jecha uye Shangdian poda inoshandiswa. Nekuda kweiyo diki yekuwedzera coefficient, chete 4.6 × 10-6 / ℃, ivo vanogona kufuratirwa.
(5) Mhedzisiro yekubheka goko: Nekuti iyo yekuwedzera coefficient yegoko idiki, kana tembiricha yegoko iri 1150 ℃, inongova 0.053%, saka inogona kufuratirwa.
(6) Kufuridzira tembiricha yekukanda: kukwirisa tembiricha yekukanda, kuwedzera kuderera kwemwero, uye kudzika kwetembiricha yekukanda, kudiki kuderera, saka tembiricha yekukanda inofanira kunge yakakodzera.
Nguva yekutumira: Nov-15-2021