INTERNAL GEARS MANUFACTURING POSSIBILITY ON THE GEAR【原文】.pdf
内齿轮在滚齿机“ FD250 ”上制造的可能性外文文献翻译、中英文翻译
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内齿轮在滚齿机“
FD250
”上制造的可能性外文文献翻译、中英文翻译
齿轮
滚齿机
制造
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内齿轮在滚齿机“ FD250 ”上制造的可能性外文文献翻译、中英文翻译,内齿轮在滚齿机“,FD250,”上制造的可能性外文文献翻译、中英文翻译,齿轮,滚齿机,制造,可能性,外文,文献,翻译,中英文
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INTERNAL GEARS MANUFACTURING POSSIBILITY ON THEGEARHOBBING MACHINE “FD250”Sandor RAVAI NAGY,North Univrsity of Baia Mare, RomaniaGabor Laszlo PAY,Ph.D., College of Nyiaregyhaza, HungaryAbstract: Thepaperpresents the possibility to modify the FD250 gear hobbing machine, witha device, in a machine apply to manufacturing internal gears. Redesigned and equipped withdevice it is possible to obtain a machine tool with higher universality and a possibility to decreasethe manufacturing price for the internal spur and helical gear.Key words: Internal gears, gear hobbing machine, design, device.1.INTRODUCTIONThe paper presents the possibility to manufacture the internal cylindrical gears on thegear hobbing machines. To the present almost all internal gears what is manufactured with metalcutting methods are use the gear shaping procedures.With the presented solution it is possible to eliminate some problems what presupposethe gear shaping methods. In case when its manufactured helical gear for each helix angle thegear shaper need a varied 3D cam. This 3D cam presents many technical problems when aremanufactured and his precision has direct influence on the gear precision. On the financial sidethe gear hobbing machine are cheaper and his productivity are higher.2. APPLICATION AREAThis method and the device find applicability in branch of gear manufacture firms in casewhen it is needs to obtain gears for prototype and small series. Concomitantly is a possibility toinvestin the existingmachines to growth the machines productivity.With the presented device the universality of machines are growled and it is succeedingto manufacture on the same machine differed types of gears.3. THE“FD250” GEAR HOBBING MACHINEThe FD250 gear hobbing machine (Figure 1.) was designed by the Cugir MechanicalFactory able to manufacture spur and helical gears with 250-300 mm maximal diameter and m=6mm maximal module. On this machine it is possible to manufacture all work-piece with thegenerating method in the presented limits. For hob the maximal dimensions are the follows:Dh=105mm, Lh =100mm (hob diameter and length).Fig. 1. The FD250 gear hobbing machine4. THE “FD250” HOBBING MACHINE MODIFY TO BY ABLE MANUFACTURE INTERNALSGEARSTo effectuate the cutting procedure the cutting tools must by positioned inside of thedonut form work-piece. For this the kinematics chain of primary motion for the hob must by toprolong. This proposed modification and the original kinematics chain are presented in (Figure2.a. respective 2.b.)Fig. 2.a. The modified kinematics chainFig. 2.b. The original kinematics chainIn conformity with the adopted manufacturing method form-copying method orgenerating method in kinematics chain of indexing must introduce a manually indexing device forform copying case.After a dimensional and design study thefollow possibility for modification are identified:1-The work piece is fixed on the rotary-table and the cutting tool in device that introduceinside on the work piece, without modified the rearcolumn. (Figure.3.)Fig.3. Hobbing machine without modified the rear columnThis solution is applying in case of work piece with external diameter under 330mm,because the rearcolumn limits the work piece dimensions.2-The work pieces are fixed on the rotary-table and the cutting tool in device thatintroduce inside on the work piece and the rear column are dismantling. (Figure.4.)Fig.4. Hobbing machine with dismantled rear columnIn this case its possible to manufacture work piece with 800-850 mm maximum diameter.But in this case must by accorded a several attention for what cutting data are choice for avoidthe over require the kinematics chain of indexing. It is imported to not forget that FD250 aredesigned for cutting data adequate for work piece with maximal diameter250-300 mm.The work piece is fixed on the rotary-table of gear hobbing machine with jaw church orwith faceplate, in depends on his dimension.5. USED CUTTING TOOLSThe possible used cutting tools are the followings:-Gear-tooth side milling cutter, in case when the internal gear are manufactured with theform-copying method, tooth space by tooth space. (Figure.5.)The tools profile is obtaining similar with the profile for external dears, taking in considerationthe contact between the gears in gearing are convex-concave.Fig.5. Gear-tooth side milling cutterFig.6. Ellipsoid hob and fly hob-Ellipsoid hob (Figure.6.) and fly hob, in case when the internal gears is manufactured with thegenerating methods.With the ellipsoid hob and fly hob it is possible to generate worm wheel for the internalworm .6. DEVICE FOR THE CUTTINGTOOLS FOR MANUFACTURING INTERNAL GEARS ANDWHEELS.The proposed device for a simply use must by designed thus that do not modify thecalculus method of the change gears compare with the toothed (external) gears. Namely thedevices gearings must by have the constant equal with 1 and do not modify the rotation directionof cutting tools. For this the easy solution is using two gears Z2 and Z3 for to maintain therotation direction and the toothed gear Z4 and the pinion Z1are identical (Z1 =Z4 ).The cross slide “2”(Figure.7.b.) are dismtled and in they place are mounting the newdevice.Fig.7. The mounting of the newdeviceFig.8. The fixing method of the new deviceFor mounting the device the hob support with the cross slide”2” (Figure.8.) are remove. Hisfixing system it is used to fix a new device. This system is with saddle key “4”for eliminate theclearance between cross slide “2” and the fixing gripper “3” (Figure.8.)The cutting tools and theZ4 -toothed gear are fixed on the same shaft-type arbor and the tools (ellipsoid hob, gear-toothside milling cutter, fly hob) are drive by the principal shaft through the device gearings (Z1Z4 ).Fig.9. The proposed deviceFigure.9. presents the 3D model of the proposed device. When the cutting tool is change,because exist a several dimension restriction inside a work piece the shaft-type arbor with thetool and toothed gear Z4all is dismantled and remounting with the new tool.7. CONCLUSION-It is possible to manufacturing internal gears and wheels on the gear hobbing machineusing a new device and adequate cutting tools.-Using the presented device it is a real possibility to manufacture helical gear without3D cam for each helix angle , as are in case of manufacturing with the gear shapingmethods.-The ellipsoid hob has a good defined domain where are able to use and are differ foreach gear with module “m” and number of toothThis device has possibility to be a beginning for few optional device families forthe existinggear hobbing machines.In the gear hobbing machine processing , gear requirements , However, thecalculation of the differential gear selection especially cumbersome in gear, thehelical gear (helical gear) movement and the driving force is to rely on thetransmission of axial movement along the access track to achieve the, Helical gear istherefore a direct impact on the machining accuracy of the work of the helical gearstability. And helical gear of all kinds of mechanical processing methods, the first stepis the calculation of the differential gear selection.However, due to traditional manual calculation of matching gear is not fast.Precise requirements of the above reasons, we studied differential gear selectionalgorithm based on the use of computer technology has developed a machinedifferential gear Select Software, The purpose of choosing this subject is to changethe traditional differential gear hobbing machine of choice to find a simple and quickmethod of high accuracy, to replace the traditional time-consuming and error-pronethat the look-up table method, the accuracy of this method is very low, sometimeseven adjust the gear machine tools and installation conditions can not be equippedwith gear to meet the requirements of the distribution of computing.The use of computer-assisted support options to meet on the set of gear withthe requirements. In this paper, the use of computer technology to solve differentialgear selection tools that exist in the database form, gear and traditional methods tofind the problem of low accuracy, increased machine differential Calculation of gearto find accuracy and speed, the actual production to meet the needs of.Understandingoflearningthroughtextbooksdifferentialgearhobbingofcomputer-assisted selection based on the principles and knowledge, more traditionalhanging round the drawbacks of lack of choice. Aware that the choice of a new waythe importance of the development.In the early stage of c With a deep understanding of language, according to theactual needs of the work to prepare the diagram c language program, to prepare aset of procedures used to select the right differential gear hobbing machine,debugger interface. Calculation of the transmission ratio and the transmission ratiomust meet the conditions of assembly by applying the computer technology hasdeveloped a tool to choose software differential gear.Meet the user according to their actual gear machine tool settings with theneeds of the situation. Select to differential gear, the gear can detect the correctinstallation and mating.Understanding of learning through textbooks differential gear hobbing ofcomputer-assisted selection based on the principles and knowledge, more traditionalhanging round the drawbacks of lack of choice. Aware of the choice of a new way theimportance of the development. In the early stage of c has a profound understandingof the language, according to the actual needs of the work to prepare the diagram clanguage program, to prepare a set of procedures used to select the right differentialgear hobbing machine, debugger interface. Calculation of tra
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