18611727265
18611776020
北京精密机械加工工艺基(ji)(ji)准(zhun)：装配基(ji)(ji)准(zhun)、测量基(ji)(ji)准(zhun)及定(ding)位基(ji)(ji)准(zhun)。
一、测(ce)量(liang)(liang)(liang)基(ji)准(zhun)：用(yong)以检验(yan)已加工表面的尺寸及位置的基(ji)准(zhun),称(cheng)为测(ce)量(liang)(liang)(liang)基(ji)准(zhun)。内(nei)孔轴(zhou)线是检验(yan)外圆径(jing)向跳动的测(ce)量(liang)(liang)(liang)基(ji)准(zhun);表面A是检验(yan)长度(du)L尺寸l和的测(ce)量(liang)(liang)(liang)基(ji)准(zhun)。
二、定(ding)(ding)位基(ji)准(zhun)(zhun)(zhun)：加工(gong)(gong)时(shi)工(gong)(gong)件定(ding)(ding)位所用(yong)的(de)基(ji)准(zhun)(zhun)(zhun),称(cheng)为(wei)定(ding)(ding)位基(ji)准(zhun)(zhun)(zhun)。作为(wei)定(ding)(ding)位基(ji)准(zhun)(zhun)(zhun)的(de)表面(或线、点),在第一(yi)道工(gong)(gong)序中(zhong)只能(neng)选择未加工(gong)(gong)的(de)毛坯(pi)表面,这(zhei)种定(ding)(ding)位表面称(cheng)粗基(ji)准(zhun)(zhun)(zhun).在以(yi)后的(de)各个(ge)工(gong)(gong)序中(zhong)就可采用(yong)已(yi)加工(gong)(gong)表面作为(wei)定(ding)(ding)位基(ji)准(zhun)(zhun)(zhun),这(zhei)种定(ding)(ding)位表面称(cheng)精基(ji)准(zhun)(zhun)(zhun)。
三、装配(pei)基(ji)准(zhun)：装配(pei)时用以(yi)确定零件在部件或(huo)产(chan)品中的(de)(de)位置的(de)(de)基(ji)准(zhun),称为装配(pei)基(ji)准(zhun)。
