【正文】 the lathe work, according to the bearing in the hole basic hole system39。s service life, raised the production efficiency and the product working accuracy effectively, to a great extent reduced equipment39。 主軸箱主軸前軸承孔的改造為保證車床主軸孔與滾動軸承外環(huán)的配合精度，加工時(shí)應(yīng)遵循基軸制的原則，并安排在鏗床上對主軸箱前軸承孔進(jìn)行鏗孔加工。5 增加主軸箱主軸轉(zhuǎn)速 更換車床主動輪（皮帶輪），將主軸轉(zhuǎn)速由原來的n max=600r/min增加至n max=900r/min。前后軸承裝配、調(diào)整完畢后，進(jìn)行1h的高速空轉(zhuǎn)試驗(yàn)，主軸軸承溫度不超過70oC，則說明主軸前后軸承調(diào)整適當(dāng)。其結(jié)構(gòu)由主軸、端蓋 、壓板、殼體、軸承、調(diào)整墊圈、螺釘、鎖緊螺母等組成。s thermostability.(2) headstock39。s structure before the original main axle, simultaneously enhances the spindle speed to n max=900r/min, made the obsolete equipment to enhance the rigidity and the rotation precision, raised equipment39。s service life, causes the main axle rotation precision gradual reduction, the very great degree has affected the working accuracy and the production benefit.Because sliding bearing39。s reasonable lubrication is the main axle normal work reliable guarantee, must therefore pay attention to the fuel feed which the main axle front bearing lubricates. When the summer temperature is high, if the fuel feed are excessively many, not only on the bearing cannot cool and lubricate, because instead seriously stirs the phenomenon to cause the bearing elevation of temperature。為解決以上弊端，將原來主軸前滑動軸承改為滾動軸承的結(jié)構(gòu)，同時(shí)將主軸轉(zhuǎn)速提高到n max=900r/min，使陳舊的設(shè)備提高了剛性和回轉(zhuǎn)精度，提高設(shè)備的利用率。即用扳手緊固螺母9，當(dāng)手用力扳動主軸時(shí)主軸能自動回轉(zhuǎn)12周，則說明前軸承的徑向間隙已調(diào)整適當(dāng)，反之說明間隙過大或太小，然后擰緊螺釘8。180㎜。圓柱度公差=(如圖1) 主軸前軸頸部分的改造首先應(yīng)檢查原主軸滑動部分的軸頸段的尺寸，因余量不多，要掌握好加工余量。有利提高產(chǎn)品的加工精度和生產(chǎn)率，延長設(shè)備的使用壽命，降低維修費(fèi)用，提高設(shè)備利用率。s bearing inner rim along the main axle coneshape then to realize the adjustment. Namely with spanner tight nut 9, when the hand makes an effort moves the main axle the main axle to be able to rotate automatically for 12 weeks, then explained that front bearing39。附錄 C620 lathe main axle structure transformation design Ren Fu jun huang ru lin wang qun Abstract: The C620 lathe main axle front bearing, changes present39。19 ) the size 100 requests (request to leave leeway grinding allowance). Simu