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美制梯形(xing)(xing)螺(luo)(luo)(luo)紋(wen)(wen)(wen)(wen)稱為愛(ai)(ai)克(ke)(ke)(ke)(ke)母(mu)(mu)螺(luo)(luo)(luo)紋(wen)(wen)(wen)(wen),牙形(xing)(xing)角29度,分為一般(ban)用(yong)途(tu)愛(ai)(ai)克(ke)(ke)(ke)(ke)母(mu)(mu)螺(luo)(luo)(luo)紋(wen)(wen)(wen)(wen),對中(zhong)(zhong)愛(ai)(ai)克(ke)(ke)(ke)(ke)母(mu)(mu)螺(luo)(luo)(luo)紋(wen)(wen)(wen)(wen)和(he)矮牙愛(ai)(ai)克(ke)(ke)(ke)(ke)母(mu)(mu)螺(luo)(luo)(luo)紋(wen)(wen)(wen)(wen)三(san)種. 征代號"ACME".通(tong)常采用(yong)一般(ban)用(yong)途(tu)愛(ai)(ai)克(ke)(ke)(ke)(ke)母(mu)(mu)螺(luo)(luo)(luo)紋(wen)(wen)(wen)(wen),如果(guo)使(shi)用(yong)一般(ban)愛(ai)(ai)克(ke)(ke)(ke)(ke)母(mu)(mu)螺(luo)(luo)(luo)紋(wen)(wen)(wen)(wen)有(you)困難,如內,外螺(luo)(luo)(luo)紋(wen)(wen)(wen)(wen)間經常出現卡死的(de)(de)場合,則選(xuan)用(yong)對中(zhong)(zhong)愛(ai)(ai)克(ke)(ke)(ke)(ke)母(mu)(mu)螺(luo)(luo)(luo)紋(wen)(wen)(wen)(wen).矮牙愛(ai)(ai)克(ke)(ke)(ke)(ke)母(mu)(mu)螺(luo)(luo)(luo)紋(wen)(wen)(wen)(wen)僅用(yong)于(yu)空間受限制的(de)(de) 殊場合.
愛(ai)(ai)克(ke)(ke)母(mu)(mu)螺(luo)紋(wen)(wen)(wen)(Acme)即美(mei)制(zhi)梯形螺(luo)紋(wen)(wen)(wen),出現于1895年以(yi)前(qian)(qian),采用(yong)英寸制(zhi),牙型角為29°,不僅應用(yong)于傳動(dong)(進給和升降(jiang))和位置(zhi)調(diao)整裝(zhuang)置(zhi)中,也可(ke)用(yong)于緊固(gu)連接場(chang)合,尤其在石油及(ji)化(hua)工機械產品中 是有著(zhu) 的(de)(de)(de)應用(yong)[1-3]。目(mu)前(qian)(qian)使用(yong)的(de)(de)(de)愛(ai)(ai)克(ke)(ke)母(mu)(mu)螺(luo)紋(wen)(wen)(wen)有一般用(yong)途愛(ai)(ai)克(ke)(ke)母(mu)(mu)螺(luo)紋(wen)(wen)(wen)、對中愛(ai)(ai)克(ke)(ke)母(mu)(mu)螺(luo)紋(wen)(wen)(wen)和矮牙愛(ai)(ai)克(ke)(ke)母(mu)(mu)螺(luo)紋(wen)(wen)(wen)3種(zhong), 應用(yong)的(de)(de)(de)是一般用(yong)途愛(ai)(ai)克(ke)(ke)母(mu)(mu)螺(luo)紋(wen)(wen)(wen)。如果(guo)使用(yong)一般愛(ai)(ai)克(ke)(ke)母(mu)(mu)螺(luo)紋(wen)(wen)(wen)有困難(nan),如內(nei),外螺(luo)紋(wen)(wen)(wen)間(jian)經(jing)常出現卡死的(de)(de)(de)場(chang)合,則選用(yong)對中愛(ai)(ai)克(ke)(ke)母(mu)(mu)螺(luo)紋(wen)(wen)(wen).矮牙愛(ai)(ai)克(ke)(ke)母(mu)(mu)螺(luo)紋(wen)(wen)(wen)僅用(yong)于空間(jian)受限制(zhi)的(de)(de)(de) 殊場(chang)合.
愛(ai)克(ke)母(mu)螺(luo)紋(wen) 標(biao)(biao)準(zhun)的(de)(de)制定(ding)工(gong)(gong)作始于1932年,1941年美(mei)國頒布了愛(ai)克(ke)母(mu)螺(luo)紋(wen)標(biao)(biao)準(zhun)ASA B1·3,之后經過多次(ci)的(de)(de)修訂改版使(shi)得該標(biao)(biao)準(zhun)得到不(bu)斷完善。現(xian)在(zai)的(de)(de)美(mei)國標(biao)(biao)準(zhun)為ASME B1·5-1997(R2004)[4],國內對該螺(luo)紋(wen)的(de)(de)使(shi)用主要是(shi)參照美(mei)國標(biao)(biao)準(zhun),目(mu)前還沒有出現(xian)可(ke)替代(dai)的(de)(de)標(biao)(biao)準(zhun)。愛(ai)克(ke)母(mu)螺(luo)紋(wen)標(biao)(biao)準(zhun)系列限定(ding)在(zai)0·250~5·000 in(6·35~127 mm)尺寸(cun)范圍內,而對石油機械產品和許多 殊(shu)工(gong)(gong)業場合,使(shi)用較多的(de)(de)是(shi)直徑與(yu)螺(luo)距的(de)(de)非標(biao)(biao)準(zhun)組合系列。
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