Grating Ruling Machines Friction Drive Mechanism Of Dynamic Analysis

Grating ruling machines have always been in the field of precision machinery iscalled "the king of precision machinery, since the first grating ruling machines available inquite long period in history, grating ruling machines system structure and technicalprogress always marks the development and progress in the field of precision machinerytechnology. To achieve high precision positioning and high resolution, and considering thedomestic existing processing and detection technology, drive way elected friction drive.Friction drive mechanism is made up of the drive shaft and the driven compactionforce generated by the friction between the rod in the follower lever to produce movement,continuous exhibition into the linear motion of the follower lever, thus realizing movementand power transmission. Traditional screw nut mechanism, gear rack mechanism comparedwith friction drive, there are a lot of shortcomings, mainly in the current technicalconditions, the motion precision can’t meet the requirements, such as the screw pitch error,pitch error of gear and so on are the important factors affecting the transmission accuracy.In addition, the transmission of the clearance and friction heat is caused by transmissionerror factors cannot be ignored. Friction drive can overcome the above shortcomings, inthe transmission because of its simple element shape, easy to guarantee machiningaccuracy, the transmission zero clearance, thus can reduce the frequency fluctuation ofmotor and speed measuring machine. So in the ultra precision machine tool using frictiondrive, can achieve high precision transmission.But the friction drive drive mode has the defects of his own, will appear in the processof movement crawl and skid phenomenon, and skid phenomenon through thecorresponding increase of preloading can eliminate the influence, So-called crawling thefollower in friction pair under the condition of uniform friction drive and must be producedby the periodically when the continual walk or slow fast movement phenomenon.crawlingphenomenon in theory, the author of this paper by using matlab simulink part of theory analysis, through the discussion of experimental data of friction drive mechanism offriction drive creep influence on positioning precision of the actual size.Through experiments prove, friction drive in the process of the work of100Npre-pressure crawling phenomenon does not affect the positioning accuracy.