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齿条制造工艺方法和控制措施

点击数:2021-07-28 14:30:08

  齿条(tiao)制造工艺方法和控(kong)制措(cuo)施

  粗加(jia)(jia)(jia)(jia)工(gong)(gong) 本(ben)序(xu)(xu)是从(cong)毛坯转化成(cheng)半(ban)成(cheng)品的(de)过程。为(wei)了既降成(cheng)本(ben)又提(ti)加(jia)(jia)(jia)(jia)工(gong)(gong)效率,安排在捷克(ke)斯柯达W200H数显落地镗床上,采用φ200mm刀盘(pan)、φ315mm三(san)(san)面刃铣(xian)(xian)刀和φ25mm刀盘(pan)进行加(jia)(jia)(jia)(jia)工(gong)(gong)。先采用φ200mm刀盘(pan)加(jia)(jia)(jia)(jia)工(gong)(gong)齿(chi)条(tiao)的(de)6个面,单(dan)面留10mm加(jia)(jia)(jia)(jia)工(gong)(gong)余量,然后用万角(jiao)度头(tou)上φ315mm三(san)(san)面刃铣(xian)(xian)刀,沿齿(chi)形轮廓开出直槽,再将工(gong)(gong)件侧立,用φ25mm刀盘(pan)按照排折线的(de)方(fang)式(shi)加(jia)(jia)(jia)(jia)工(gong)(gong)出两侧齿(chi)形面,各(ge)面留10mm加(jia)(jia)(jia)(jia)工(gong)(gong)余量,转下序(xu)(xu),这样可以快去(qu)大部分加(jia)(jia)(jia)(jia)工(gong)(gong)余量,比(bi)单(dan)用φ25mm刀盘(pan)粗铣(xian)(xian)齿(chi)槽齿(chi)条(tiao)加(jia)(jia)(jia)(jia)工(gong)(gong)效率提(ti)近3倍。

  一次半(ban)精加工 齿(chi)条经过调质处理后回到(dao)3m×8m数控龙(long)门铣床上进行(xing)半(ban)精加工。将工件平放到(dao)工作台上两次装夹加工。在(zai)找正过程中发现各齿(chi)条存在(zai)着向齿(chi)侧凹心的变(bian)形,变(bian)形量在(zai)3~5mm。

  这主要是粗加(jia)工(gong)(gong)阶(jie)段齿形侧去较大的加(jia)工(gong)(gong)量所造成的。均匀考虑加(jia)工(gong)(gong)余(yu)量后,半精加(jia)工(gong)(gong)外(wai)廓和齿形,各面留5mm余(yu)量,转下序进行人工(gong)(gong)时效。

  齿(chi)条厂(chang)家结构允许的(de)前提下,模数m应该稍微(wei)选(xuan)得大一(yi)点,对于有冲击载荷的(de)开始传动比(bi)较(jiao)重要。

  二次半精加(jia)工(gong)(gong) 齿条(tiao)经过人工(gong)(gong)时效(xiao)后(hou),内(nei)(nei)的(de)残余应(ying)力会得到释放。本序主要(yao)的(de)加(jia)工(gong)(gong)内(nei)(nei)容包括半精加(jia)工(gong)(gong)齿形、轮(lun)廓面(mian)和加(jia)工(gong)(gong)各把合孔等。在(zai)数控龙门铣(xian)床上,按照图2所示(shi)装夹方法(fa),采(cai)用万角(jiao)度(du)头上φ250mm直角(jiao)刀盘加(jia)工(gong)(gong)齿形,分2~3次走刀进行,单面(mian)留(liu)1mm加(jia)工(gong)(gong)余量,然(ran)后(hou)工(gong)(gong)件翻180°,加(jia)工(gong)(gong)齿条(tiao)底面(mian)至(zhi)1mm加(jia)工(gong)(gong)余量,转下序自然(ran)时效(xiao)5天。半精加(jia)工(gong)(gong)工(gong)(gong)序可在(zai)同一台机床成(cheng)组加(jia)工(gong)(gong)齿条(tiao),这样可以缩短整体加(jia)工(gong)(gong)周(zhou)期。


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