车床跟刀架的改进

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Jun.2013机 床 与 液 压Hydromechatronics Engineering Vo1.41 No.12DOI：10.3969/j.issn.1001-3881.2013.12.O11The Improvement of Lathe Folow RestFENG Xiaofei ，ZHENG Weiganga.School ofEnergy And Power Enginering；b.Engineering Training Center，Wuhan University of Technology，Wuhan 430063，ChinaAbstract：Lathe folow rest is auxiliary device with the radial suppofl for the rotating workpiece，to-gether with the tool along the workpiece to move axialy when processing.There is a traditionallathe with folow rest suppofling claw badly worn at a workshop.The paper improved and de-signed a new folow rest by roling bearings，roling friction instead of sliding friction.Proven togood efect，and efectively solve the problem of suppoclaw wear。

Key words：foIlow rest，suppoclaw，wear，roling bearingsFollow rest is one of attachments of lathe，gener-aly fixed in the lathe saddle and lnoves following be-hind in turning tool when turning。to withstand cut-ting force on the workpiece[1].As slender shaftworse stiffness，turning is more dificult，especiallyturning that does not alow being connected to theknife in the middle，so follow rest should be used toclamp the slender shaft21.Ifllow rest is used tosupport slender shaft，which can enhance its strengthand rigidity，effectively prevent the bending deforma-tion of the workpiece，and ensure the quality of theprocessing.Wear of supporting claw of folow rest isone of the common faults in the turner production。

Follow rest usually has two types of two claws supportand three-jaw support，and based on the three-jawfollow rest to put forward and improve a new llowrest to extend the life in the turner production，there-by improve economic efficiency。

2.Analysis of the presentFrom the principle of follow rest point of view，Just two supporting claw is ok due to total cuttingReceived：2013-02-16ZHENG Weigan.E-mail：zfeidiao### 126.cornforce makes workpiece abutting against with two sup-port claws on the folow rest when turning.However，in actual use，especially turning elongate shaft，theworkpiece itself is with a downward gravity，while theworkpiece is inevitably somewhat curved.Thus.theworkpiece tends to generate vibration due to centrifu。

gal force instantaneously left supporting paw1.If usethree.jaw supporting，workpiece can not be moved upand down。1eft and right，in addition turn stablelyand difcult to produce vibration[3].Though three-jaw folow rest supporting and turning slender shaft isan important measure，but at the same time support-ing claw wear is inevitable.so it can be better usedin turning operations for three.jaw folow rest for de-sign and improvementThe material of supporting claw of three-jaw fol-low rest is usually ductile iron.and the material ofmachining shaft are usually ordinary carbon steel，high-quality carbon steel，alloy stee1.As supportingpawls。ductile iron directly contact with the material，and the major axis of the processing of high-speed ro--tation caused severe wear of supporting pawls due tothe greater coefficient of friction between the cast ironand stee1.and its top end close to the conical sup。

porting pawls before it is worn ，but concave seriouslyafter wear，as shown in Fig.1.At present in order torespond to such a support claw wear mainly continu-ously poured oil cooling and lubrication，and continu-ously adjust the position of folow rest supportingpawls to ensure the concentricity of the workpiece andavoid the generation of the shape error in the turner56 Hydromechatronics Engineeringproduction [4].However，ductile iron supportclaws still continue to wear.which causes great in-convenience to the turner production.As can be seenin Fig.1，each supporting claw wear is different，soit is necessary to be adjusted regularly when turning，which also causes some machining accuracy of shaftparts even scrapping。

Fig.1 Wear of folow rest support claw3.The improvement of follow rest3.1.Improvement schemeAccording to follow rest support claw wear，putforward improvement measures. In supporting clawfront end features rollingron to contact with axialbearings instead of ductile i-workpiece.Supporting clawsand tool jointly clamp.a workpiece. In order to im-prove stability when turning，the front end of eachsupport claw is provided with two rolling bearing，in-teraction， supporting pawls after the improvementshown in Fig.2.Bracket assembly instead of the duc-tile iron block in supporting pawl tip， two rolingbearingsSeS3 mounted on the bracket 1，the pin 2 pas-through the bearings and gaskets 5，and the pinensures the stability of the bearing in the longitudinalposition as the gasket ensures bearing not from side toside，and then screw 4 fixed pin。

41.Bracket，2.Pin，3.Bearing，4.Screw，5.GasketFig.2 Diagram of support claw after improved of folow rest3.2.Characteristics of follow rest that improvedI)Change sliding friction to roling friction。

The roling friction is hinder that is generated whenan object rols(or scrol trend)along the other objectsurface against objects roling，and roling instead ofsliding can greatly reduce the frictional resistance[5].Roiling bearings together with the workpieceare doing rotational movement when workpiece iswhirling，which changes the sliding friction to rollingfriction，reduces the coeficient of friction as a resultof reducing friction and wear.Besides damage to theworkpiece is also smaller， thereby overcome wearproblem of ductile iron block in supporting claw frontend before improved。

2)Double bearings.If single bearing，the con-tact area is small and small pressure roles in theworkpiece，and reach less than ideal results.There-fore it can increase the contact area and act the work。

piece suficient pressure to use double rolling bear-ings，and ensure the accuracy requirements whenturning。

3)Increase the allowed speed of the workpieceand improve the processing quality. Follow rest be-fore Improved when turning，due to the wear of sup-porting claws，with the result regularly adjust ductileiron block in supporting claw front end so as to guar-antee a stable turning.After improved，roling bear-ings together with the workpiece do rotation with min-imal wear and can be allowed high-speed rotation ofthe workpiece，which makes it achieved to turn slen-der shaft parts at high-speed。

The bracket assembly that improved is mountedon the adjustable sleeve of folow rest，and the struc-ture diagram shown in Fig.3。

Fig.3 Diagram ofllow rest after improved4.ConclusionsImproved follow rest applied to turning opera-tions，proven，to good effect in overcoming support-ing claws wear before improved while is also able tomeet the accuracy requirements，improve processingefficiency. The application of this program to im-provement of lathe centre rest is equally applicable。

(Continued from 77 page)W ANG Xiaomei，et al：Design on Manipulator Used for Hydraulic CylinderBotom Welding 775.ConclusionsIn modem industry，as the automated productionand the demand of human security in job continues tobe strengthened，manipulator is used more wildly.Thewelding manipulator has the advantages of simple in de-sign，stable and reliable act，and research and develop-merit in low-cost.The PLC control system has the char-acteristic of simple in programming，high reliability，good in versatility，strong functions and easy to use。

[2][3][4]References： [5][1] LV Juncheng，YANG Lianbo.Structural stability analy-液压缸缸底焊接机械手设计王晓梅h，向 伟 ，朱新才 ，周 雄(1.重庆科技学院，重庆 401331；2.重庆理工大学，重庆 400054)sis on 4-dof simple welding manipulator[C 1//AdvancedManufacturing Technology and Systems。2012。

DONG Maoqi，YU Fusheng，WANG Xue.Design of con-trol unit flor 3 D manipulator based on s7-200 PLC 1。

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WANG Yueqin.Control System Design of the Manipula。

GUAN Ming，ZHOU Xilun，MA Lijing.Control SystemDesign of Manipulator Based Oil PLc[J].ManufacturingAutomation，2012，34(14)：l20-121，142。

摘要：分析 了液压缸缸底焊装机械手的工作任务 ，确定了其总体设计方案，完成 了执行机构、送丝机构、起混测和灭弧 自动起弧功能的设计￠绍了该机械手气压传动 系统设计、PLC控制 系统设计等内容，为小型产品的焊接 自动化提供了-定的技术借鉴。

关键词：机械手；焊接；气动控制；PLC控制中图分类号：TH12(Continued on 56 page)References：[1][2]CUI Zhaohua， WANG Xihai. Turner operation skilltraining diagram[M].Jinan：Shandong Science＆Tech-nology Press，2008。

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武汉理工大学 a.能源与动力工程学院；b.工程训练中心，武汉 430063摘要：车床跟刀架是径向支撑旋转工件的辅助装置，加工时，与刀具-起 沿工件轴向移动。针对某车间现有传统车床跟刀架支承爪磨损严重的问题，借用滚动轴承改进设计了-种新型跟刀架，利用滚动摩擦代替滑动摩擦。经实践检验，该方法效果良好，有效地解决了支承爪的磨损问题。

关键词：跟刀架；支撑爪；磨损；滚动轴承中图分类号：TH16