Accuse what machine tool and precision of machining center job ask to rise increasingly as number, deputy high accuracy turns ball guide screw the inevitable trend that makes progress, its also become the outstanding issue in assembling gradually in the installation precision on lead plane. Ball guide screw deputy it is the helix drive component that is scroll body with ball between guide screw and nut, it is life of a kind of nicety, efficient, tall stiffness, longevity and the advanced drive component of energy-saving province report, but the sharp movement of the workbench of whirligig translate into electromotor, because this applies extensively in machinery to make, especially on numerical control machine tool and machining center, the efficient high speed that is lead plane is changed offerred good condition. Accuse what machine tool and precision of machining center job ask to rise increasingly as number, deputy high accuracy turns ball guide screw the inevitable trend that makes progress, the installation precision on lead plane also becomes the outstanding issue in assembling gradually, to achieve the requirement of precision of position of machine tool coordinate, reduce guide screw to circle degree, prevent radial and slant buy load, reduce guide screw shafting of each link warm up to be out of shape with heat, the reduces servo electric machinery transmission torque of utmost raises the dependability that the machine tool works continuously, must raise ball guide screw deputy the installation precision on the machine tool. Ball guide screw deputy commonly used installation means has the following kinds normally: Double push - free means; Double push - bearing means; Double push - double push way. Large horizontal machining center, it is the efficient treatment facilities of the Electromechanical unifinication that has high-powered, tall tigidity and high accuracy, it is to machine etc of spare parts of casing of drive of of all kinds high accuracy the ideal of large mould machines equipment. Its 3 coordinate direction all uses servo electric machinery to drive drive of scroll guide screw, 3 coordinate direction, namely the working distance of X, Y, Z is greater. As a result of ball guide screw deputy structural characteristic, make the ball guide screw of on lead plane 3 direction is installed deputily become particularly crucial. According to traditional technique, installation ball guide screw deputy all the time club of core of continue to use and fixed position are covered bearing of two upright bearing reach intermediate silk mother join is together corrective, core club with dial gauge axes and machine tool slideway search the method that parallel makes freely of core strong drive is light. Method of this kind of installation is on the machine tool of small-sized numerical control with lesser journey of 3 coordinate direction and machining center application is more convenient. Because core club and fixed position are covered, fixed position covers the bearing aperture with two upright bearing and the filar parent among aperture is existing to cooperate clearance, the bearing bearing aperture after often making install and filar mother the coaxial of aperture spends an error bigger, cause guide screw to circle degree increase, radial slants buy load increases, cause guide screw shafting the temperature of each link is elevatory, hot be out of shape greaten to increase with transmission torque wait for a series of serious consequence, bring about overload of servo electric machinery, overheat, servo calls the police, those who affect a machine tool is normal move. Additional, aperture of two upright bearing and mother of the silk intermediate the real difference of aperture is worth cannot accurate measure, adjust accurately the effect is further thereby. To 3 numerical control machine tools with coordinate direction greater distance and machining center, because what need core club to be in more 1500mm above, treatment is difficult, assure precision not easily, because this cannot use core club and fixed position,cover cooperate look for square law to undertake ball guide screw is installed deputily. Producing some model when horizontal machining center, because the 3 coordinate distance of the machine tool is greater, in the process that uses traditional technique installation, as a result of aperture of two upright bearing and mother of the silk intermediate aperture coaxial spends out of tolerance, cause ball guide screw radial and slant buy load increases, often appear overload of servo electric machinery, overheat, servo calls the police wait for a phenomenon, make the machine tool cannot move continuously, at the same time deputy service life mixes guide screw of serious effect ball transmission precision, shortened the maintenance of lead plane is periodic. Use method of other outfit recipe, if use mobile saddle, shorten filar mother with bearing distance, filar mother with two upright bearing search respectively method, as a result of need two paragraphs search respectively, add what check club and check cover to cooperate clearance, actual application effect is not ideal also, put in afore-mentioned problems likewise. Through tackling key problem to the spot technology of this product, fumble through what relapse for many times with manufacturing test and verify, summary gives a more reliable assembly technique. Above all, use integral formula special core club filar mother aperture is corrective, make of its and fiducial slideway, side direction parallelism is in 0. 01/1000 less than; filar mother after securing, use major to measure clamping apparatus to measure mother giving silk actually pitch is fiducial of slideway, side direction distance; Next, use integral formula likewise special check club allows bearing Kong Yuji slideway, side direction parallelism searchs to be in 0.
01/1000 less than, use special measure clamping apparatus to measure a bearing pitch actually of fiducial slideway, side direction distance, aperture of requirement silk mother and fiducial slideway, side direction distance is consistent, allow difference is 0.
01; bearing fixed. This kind of method uses integral formula special check club, not only length is short, and cover core club and fixed position close 2 for one, disappear is covered besides core club and fixed position between cooperate clearance, assured mother of bearing aperture, silk reliably the parallelism of aperture and slideway; Pass the measurement of actual distance, make aperture of bearing of two upright bearing and filar mother the coaxial of aperture is spent also got assuring reliably, reduced ball guide screw to be circled deputily so spend and radial slants buy load, raised guide screw to install precision deputily. Additional, in the process that installs ball guide screw, must control the axial change momentum of ball guide screw strictly, this technology index will affect the transmission position precision of system of feed of ball guide screw directly. According to the spot actual test and verify makes clear: Above all, the bearing that should carry installation servo electric machinery the bearing inside has been assembled, its have main effect in process of drive of scroll guide screw, the axial change momentum of ball guide screw control is in 0.
015~0.
02 between; Next, again bearing of will other one aspect of the matter the bearing inside has been assembled, make axial change momentum is controlled in 0.
01 less than. Can assure the stiffness of system of feed of ball guide screw and precision effectively so. Of axis of ball guide screw beforehand drawing also is very necessary. To raise the stiffness of system of feed of ball guide screw and precision, carry out to guide screw axis beforehand drawing is very effective, but differ as a result of each section of guide screw axis, and temperature rise is worth not easy and accurate set, reach by concerned document computation so beforehand pulling force can serve as referenced quantity only. The guide screw axis that aborning often is worth the cause that has the way that lose a value undertakes beforehand drawing, make the trend of the curve of fixed position precision of machine tool workbench approachs a level. Aborning, the sky of the ball guide screw of some 3 coordinate direction of large machining center that assembles through using afore-mentioned new technique carries torque to all be reduced apparently, carry electric current to also be reduced significantly for nothing, servo electric machinery and servo job are regular, did not appear the servo of 3 coordinate direction calls the police, the machine tool can run 72h above continuously. Afore-mentioned results fill minute of specification to use new technique, can make sure ball silk lever installs precision deputily effectively, additional, this method still does not accept the restriction of volume of machine tool distance. Machine tool distance is greater, more can dash forward show its advantage, for machine tool of large numerical control and guide screw of machining center ball deputy installation offerred a kind effective and reliable method. CNC Milling