Simintin Gyare Gyare

Simintin Gyare Gyare Ƙaƙƙarfan ɓangaren kuma ana saninsa da simintin gyare-gyare, wanda aka fitar da shi ko kuma ya karye daga cikin ƙirjin don kammala aikin.  Kayan simintin gyare-gyare yawanci ƙarfe ne ko kayan saitin lokaci daban-daban waɗanda  ke warkewa bayan haɗa abubuwa biyu ko fiye tare;  misalan su ne epoxy, concrete, filasta da  yumbu.  Ana amfani da simintin gyare-gyare mafi yawa don yin hadaddun sifofi waɗanda zasu yi wahala ko rashin tattalin arziki don yin ta wasu hanyoyin.  Ana iya jefa kayan aiki masu nauyi kamar gadaje na kayan aikin injin, na'urorin sarrafa jiragen ruwa, da sauransu. Ana iya jefa su cikin sauƙi cikin girman da ake buƙata, maimakon ƙirƙira ta hanyar haɗa ƙananan gundumomi da yawa.1]Degarmo, E. Paul; Black, J T.; Kohser, Ronald A. (2003), Materials and Processes in Manufacturing (9th ed.), Wiley, p. 277, ISBN 0-471-65653-4 Yin wasan kwaikwayo tsari ne na shekaru 7,000.  Mafi dadewa da ya tsira shine kwaɗin jan karfe daga shekarar alif 3200 BC2]Ravi, B. (2005), Metal Casting: Computer-Aided Design and Analysis (1st ed.), PHI, ISBN 81-203-2726-8.

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