1935: Txoj kev vam meej ntawm fiber ntau nylon cim qhov kev nkag ntawm cov khoom siv hluavtaws polymer rau hauv daim ntawv thov engineering, tso lub hauv paus rau kev yug me nyuam ntawm cov yas yas.
Tom qab ntawd, vim nws qhov zoo xws li lub teeb yuag, tsis muaj suab nrov, tus kheej -lubrication, thiab corrosion kuj, yas tau pib siv los tsim cov iav, feem ntau yog rau qis -load thiab qis- cov xwm txheej ceev, xws li cov khoom ua si thiab cov cuab yeej siv yooj yim.
Hauv ob xyoos dhau los, nrog rau kev txhim kho ua tiav thiab kev hloov kho ntawm siab - lub zog, siab - hnav- tiv taus thiab lwm yam siab - kev ua tau zoo engineering plastics, cov iav yas tau tsim los ntawm kev thauj khoom ntau dua, thiab lawv cov ntawv thov tau nthuav dav ntxiv. Hauv ntau qhov chaw xws li tsheb thiab cov khoom siv hauv tsev, tau muaj ib qho qauv ntawm "hloov hlau nrog yas". Nyob rau hauv cov nqe lus ntawm standardization, thawj lub teb chaws tus qauv ntawm Tuam Tshoj lub yas iav kev lag luam, "GB / T38192-2019 Precision System rau Txhaj Molded Plastic Cylindrical Gears", tau tso tawm nyob rau hauv 2019, sau lub domestic sib txawv [2]. Nyob rau hauv 2024, lub teb chaws tus qauv "GB / T 44846-2024 xam ntawm Load Capacity ntawm yas Gears" raug tso tawm, uas ua ke nrog cov precision txheem tsim lub hauv paus txheej txheem ntawm yas zog.
