Histori ea makotikoti a aluminium
Makoti a tšepe a biri le a ho paka lino a na le nalane ea lilemo tse fetang 70. Mathoasong a lilemo tsa bo-1930, United States e ile ea qala ho hlahisa makotikoti a tšepe a biri. Kotikoti ena ea likarolo tse tharo e entsoe ka poleiti ea tin. Karolo e ka holimo ea 'mele oa tanka e bōpehile joaloka khoune, 'me karolo e ka holimo ke sekoahelo sa kotikoti se bōpehileng joaloka moqhaka. Ponahalo ea eona ka kakaretso ha e fapane haholo le ea libotlolo tsa khalase, kahoo mohala oa ho tlatsa botlolo ea khalase o ne o sebelisetsoa ho tlatsa qalong. E bile feela ho fihlela lilemong tsa bo-1950 moo mohala o inehetseng oa ho tlatsa o ileng oa fumaneha. Sekoahelo sa kotikoti se ile sa fetoha sebopeho se bataletseng bohareng ba bo-1950 'me sa ntlafatsoa hore e be sekoahelo sa lesale la aluminium lilemong tsa bo-1960.
Li-can tsa lino tsa aluminium li hlahile pejana bofelong ba lilemo tsa bo-1950, 'me li-can tsa DWI tse likarolo li peli li ile tsa hlaha ka molao mathoasong a lilemo tsa bo-1960. Nts'etsopele ea li-can tsa aluminium e potlakile haholo. Qetellong ea lekholo lena la lilemo, tšebeliso ea selemo le selemo e fihlile ho feta limilione tse likete tse 180, e leng sehlopha se seholo ka ho fetisisa li-can tsa tšepe tse felletseng lefatšeng (tse ka bang limilione tse likete tse 400). Tšebeliso ea aluminium e sebelisetsoang ho etsa li-can tsa aluminium le eona e ntse e hola ka potlako. Ka 1963, e ne e le haufi le lefela. Ka 1997, e fihlile ho lithane tse limilione tse 3.6, e leng se lekanang le 15% ea tšebeliso eohle ea lisebelisoa tse fapaneng tsa aluminium lefatšeng.
Theknoloji ea tlhahiso ea makotikoti a aluminium e ntse e ntlafatsoa khafetsa.
Ka mashome a lilemo, theknoloji ea tlhahiso ea makotikoti a aluminium e ntse e ntlafala khafetsa. Boima ba makotikoti a aluminium bo fokotsehile haholo. Mathoasong a lilemo tsa bo-1960, boima ba makotikoti a aluminium a sekete ka seng (ho kenyeletsoa le 'mele oa makotikoti le sekoahelo) bo fihlile ho liponto tse 55 (hoo e ka bang lik'hilograma tse 25), 'me bohareng ba bo-1970 bo ile ba theohela ho liponto tse 44.8 (25 kg). Likilograma), e ile ea fokotseha ho ea ho liponto tse 33 (lik'hilograma tse 15) bofelong ba bo-1990, 'me joale e fokotsehile ho ea ho liponto tse ka tlase ho tse 30, e leng hoo e ka bang halofo ea lilemo tse 40 tse fetileng. Lilemong tse 20 ho tloha ka 1975 ho isa ho 1995, palo ea makotikoti a aluminium (bokhoni ba li-ounces tse 12) a entsoeng ka ponto e le 'ngoe ea aluminium e eketsehile ka 35%. Ho phaella moo, ho ya ka dipalopalo tsa k'hamphani ya Amerika ya ALCOA, thepa ya aluminium e hlokahalang bakeng sa makotikoti a aluminium a sekete e ile ya fokotseha ho tloha ho diponto tse 25.8 ka 1988 ho ya ho diponto tse 22.5 ka 1998 mme ya fokotseha ho ya ho diponto tse 22.3 ka 2000. Dikhamphani tsa Amerika tse etsang makotikoti di ntse di etsa diphetoho tse tswetseng pele ho tiiseng mechine le mahlale a mang, kahoo botenya ba makotikoti a aluminium United States bo fokotsehile haholo, ho tloha ho 0.343 mm ka 1984 ho ya ho 0.285 mm ka 1992 le 0.259 mm ka 1998.
Tsoelo-pele e bobebe likoahelong tsa makotikoti a aluminium le eona e totobetse. Botenya ba likoahelo tsa makotikoti a aluminium bo theohile ho tloha ho 039 mm mathoasong a bo-1960 ho ea ho 0.36 mm lilemong tsa bo-1970, ho tloha ho 0.28 mm ho ea ho 0.30 mm ka 1980, le ho ea ho 0.24 mm bohareng ba bo-1980. Bophara ba sekoahelo sa makotikoti le bona bo fokotsehile. Boima ba likoahelo tsa makotikoti bo ntse bo tsoela pele ho fokotseha. Ka 1974, boima ba makotikoti a aluminium a sekete e ne e le liponto tse 13, ka 1980 bo ile ba fokotseha ho ea ho liponto tse 12, ka 1984 bo ile ba fokotseha ho ea ho liponto tse 11, ka 1986 bo ile ba fokotseha ho ea ho liponto tse 10, 'me ka 1990 le 1992 bo ile ba fokotseha ho ea ho liponto tse 9 le liponto tse 9 ka ho latellana. Liponto tse 8, li fokotsehile ho ea ho liponto tse 6.6 ka 2002. Lebelo la ho etsa mathini le ntlafalitsoe haholo, ho tloha ho 650-1000cpm (ka motsotso feela) lilemong tsa bo-1970 ho ea ho 1000-1750cpm lilemong tsa bo-1980 le ho feta 2000cpm hona joale.
Nako ea poso: Tshitwe-28-2021