Yiyngo Ƴeewndo Valve

1. Ko woni casting

Njamndi mboɗeeri ndii ina werlee e nder ɓuuɓri mooftirndi ndi mbaadi mum fotndi e feccere ndee, caggal nde ndi tiiɗi, geɗel heen fof ina heɓee mbaadi, mawneeki e sifaa dowri, ko ɗum wiyetee casting. Geɗe tati mawɗe : alloy, modeling, werlaade e tiiɗtinde. Nafoore ɓurnde mawnude : geɗe caɗtuɗe ina mbaawi feeñde.

2. Ƴellitaare casting

Pewnugol ngol fuɗɗii ko e kitaale 1930 e kuutoragol masiŋaaji pneumatik e peeje ceene loope artificielle.

Sifaa sanngara simin feeñii e hitaande 1933

E hitaande 1944, sifaa koɗorɗe ceene resin coofɗe tiiɗɗe peeñi

CO2 tiiɗɗo ndiyam gilaas njaareendi feeñii e hitaande 1947

E hitaande 1955, sifaa koɗorɗe njaareendi resin coktirgal nguleeki feeñi

E hitaande 1958, mbaydi njaareendi ndi resin furan alaa ko ɓuuɓnata feeñi

E hitaande 1967, mooftirgel ceene ɓuuɓɗe simmeeji feeñi

E hitaande 1968, gilaas ndiyam e hardener organik feeñi

E nder duuɓi 50 jawtuɗi ɗii, laabi kesi peewnugol mooftirɗi ɓuuɓɗi e laabi ɓalli, ko wayi no : mooftirɗi pellet magnetik, laabi mooftirɗi ɓuuɓɗi vacuum, mooftirɗi foam majjuɗo ekn... Laabi ɓuuɓɗi ceertuɗi tuugiiɗi e mooftirɗi njamndi. Ko wayi no ɓuuɓri centrifugal, ɓuuɓri toowndi, ɓuuɓri les, ɓuuɓri ndiyam ekn.

3. Sifaaaji casting

A. Yaajde jokkere enɗam e ɓuuɓri. Denndaangal geɗe njamndi. Casting limtaaka e teddeendi, mawneeki e mbaadi feccere ndee. Teddeendi ndii ina waawi wonde gila e grammeeji seeɗa haa e teemedde ton, teddeendi mahol ngol ina waawi wonde gila e 0,3mm haa 1m, mbaadi ndii ina waawi wonde geɗe caɗtuɗe no feewi.

B. Ko ɓuri heewde e geɗe mbaylaandi e ballondiral kuutorteeɗe ina keewi, ina njuuti, ko wayi no njamndi mboɗeeri e njaareendi.

C. Castings ina waawi ɓeydude laaɓal dimensiyonal e kalite surface castings rewrude e karallaagal castings yahrude yeeso, mbele geɗe ina mbaawa taƴde ko famɗi fof tawa taƴaaka.