.5?1bi0.5?b2i0.35484?c1i2?c2i0.25(2)计算误差n1?=(1n-mn0ia1i1bic1i)1n?100%?=0.8%n2?=(2n-mn0ia1i2bic1i)2n?100%?=2.1%n3?=(3n-mn0ia1i3bic1i)3n?100%?=0.8%n4?=(4n-mn0ia2i1bic1i)4n?100%?=2.1%n5?=(5n-mn0ia2i2bic1i)5n?100%?0.04%9n6?=(6n-mn0ia2i3bic1i)6n?100%?=2.1%n7?=(7n-mn0ia1i1bic2i)7n?100%?=0.04%n8?=(8n-mn0ia1i2bic2i)8n?100%?=0.7%n9?=(9n-mn0ia1i3bic2i)9n?100%?=0.04%n10?=(10n-mn0ia2i1bic2i)10n?100%?=0.8%n11?=(11n-mn0ia2i2bic2i)11n?100%?=0.4%n12?=(12n-mn0ia12i3bic2i)12n?100%?=0.7%(3)转速误差允许值为4.1%%101?????)(?本设计机床的十二级转速误差均在误差允许值范围内;转速验算合格。三、动力设计1.电机的选择合理的确定电动机的功率,使车床既能充分发挥其使用性能,满足生产要求,又不致使电动机经常轻载而降低功率因素。本设计车床典型重切削条件下的用量:刀具材料:YT15工件材料:45号钢切削方式:车削外圆参照《机床设计指导》选取:切削深度pa=5.25mm;进给量f=0.525mm/r;切削速度v=138m/min。1)主切削力:75.0pcfa1900F?=6152N2)切削功率:61200VFPc?切=12.6kw3)电动机功率:总切?PP?轴承齿轮总63V4?????=0.8计算得:总切?PP?=15.7kw;
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