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美制梯形螺(luo)(luo)(luo)紋(wen)稱為(wei)愛(ai)克母(mu)(mu)螺(luo)(luo)(luo)紋(wen),牙(ya)(ya)形角(jiao)29度,分為(wei)一般(ban)用(yong)途愛(ai)克母(mu)(mu)螺(luo)(luo)(luo)紋(wen),對中(zhong)愛(ai)克母(mu)(mu)螺(luo)(luo)(luo)紋(wen)和(he)矮牙(ya)(ya)愛(ai)克母(mu)(mu)螺(luo)(luo)(luo)紋(wen)三種. 征代(dai)號"ACME".通常(chang)(chang)采(cai)用(yong)一般(ban)用(yong)途愛(ai)克母(mu)(mu)螺(luo)(luo)(luo)紋(wen),如(ru)果(guo)使用(yong)一般(ban)愛(ai)克母(mu)(mu)螺(luo)(luo)(luo)紋(wen)有困(kun)難,如(ru)內,外螺(luo)(luo)(luo)紋(wen)間經(jing)常(chang)(chang)出現(xian)卡死的場合,則選用(yong)對中(zhong)愛(ai)克母(mu)(mu)螺(luo)(luo)(luo)紋(wen).矮牙(ya)(ya)愛(ai)克母(mu)(mu)螺(luo)(luo)(luo)紋(wen)僅用(yong)于空間受限制的 殊場合.
愛(ai)克(ke)(ke)(ke)母(mu)(mu)(mu)螺(luo)(luo)紋(wen)(wen)(wen)(wen)(Acme)即美制(zhi)梯形(xing)螺(luo)(luo)紋(wen)(wen)(wen)(wen),出(chu)現于1895年以前,采(cai)用(yong)(yong)(yong)英寸制(zhi),牙(ya)型角為29°,不僅應用(yong)(yong)(yong)于傳(chuan)動(進給和升降)和位置調整裝置中,也可用(yong)(yong)(yong)于緊固連接(jie)場(chang)合(he),尤其(qi)在石油(you)及化(hua)工機械產品中 是有(you)(you)(you)著 的應用(yong)(yong)(yong)[1-3]。目前使用(yong)(yong)(yong)的愛(ai)克(ke)(ke)(ke)母(mu)(mu)(mu)螺(luo)(luo)紋(wen)(wen)(wen)(wen)有(you)(you)(you)一般(ban)(ban)用(yong)(yong)(yong)途愛(ai)克(ke)(ke)(ke)母(mu)(mu)(mu)螺(luo)(luo)紋(wen)(wen)(wen)(wen)、對中愛(ai)克(ke)(ke)(ke)母(mu)(mu)(mu)螺(luo)(luo)紋(wen)(wen)(wen)(wen)和矮(ai)牙(ya)愛(ai)克(ke)(ke)(ke)母(mu)(mu)(mu)螺(luo)(luo)紋(wen)(wen)(wen)(wen)3種, 應用(yong)(yong)(yong)的是一般(ban)(ban)用(yong)(yong)(yong)途愛(ai)克(ke)(ke)(ke)母(mu)(mu)(mu)螺(luo)(luo)紋(wen)(wen)(wen)(wen)。如果使用(yong)(yong)(yong)一般(ban)(ban)愛(ai)克(ke)(ke)(ke)母(mu)(mu)(mu)螺(luo)(luo)紋(wen)(wen)(wen)(wen)有(you)(you)(you)困難,如內,外(wai)螺(luo)(luo)紋(wen)(wen)(wen)(wen)間經常出(chu)現卡死的場(chang)合(he),則選(xuan)用(yong)(yong)(yong)對中愛(ai)克(ke)(ke)(ke)母(mu)(mu)(mu)螺(luo)(luo)紋(wen)(wen)(wen)(wen).矮(ai)牙(ya)愛(ai)克(ke)(ke)(ke)母(mu)(mu)(mu)螺(luo)(luo)紋(wen)(wen)(wen)(wen)僅用(yong)(yong)(yong)于空間受限制(zhi)的 殊場(chang)合(he).
愛克(ke)(ke)母(mu)螺(luo)(luo)紋(wen) 標準(zhun)的(de)制定(ding)(ding)工(gong)作(zuo)始于1932年,1941年美國(guo)(guo)頒(ban)布(bu)了愛克(ke)(ke)母(mu)螺(luo)(luo)紋(wen)標準(zhun)ASA B1·3,之后經過多次的(de)修訂改版(ban)使得(de)該標準(zhun)得(de)到(dao)不斷完善(shan)。現在的(de)美國(guo)(guo)標準(zhun)為ASME B1·5-1997(R2004)[4],國(guo)(guo)內對(dui)該螺(luo)(luo)紋(wen)的(de)使用(yong)主要是(shi)參照美國(guo)(guo)標準(zhun),目前還(huan)沒有出現可替(ti)代的(de)標準(zhun)。愛克(ke)(ke)母(mu)螺(luo)(luo)紋(wen)標準(zhun)系(xi)列限定(ding)(ding)在0·250~5·000 in(6·35~127 mm)尺寸范圍內,而對(dui)石油機械(xie)產品和許多 殊工(gong)業場合,使用(yong)較多的(de)是(shi)直(zhi)徑(jing)與螺(luo)(luo)距的(de)非標準(zhun)組合系(xi)列。
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