The disappear unoccupied place orgnaization of workbench of circumgyrate of a kind of numerical control

  • Time:
  • Click:151
  • source:FANYA CNC Machining
Summary: Introduced worm of a kind of double worm wheel flexible disappear unoccupied place orgnaization, applicable is on workbench of numerical control circumgyrate. This structure reduced the demand that machines precision to worm wheel worm, reduced cost, be in at the same time worm wheel worm deputy after wearing away but self-correcting compensates clearance, labor the adjustment of dish reed and the calculation that reduce an amount. Keyword: Worm of circumgyrate workbench worm wheel is flexible outside the motion of feed of line of spring of disappear unoccupied place dish, still have the B axis that circles Y axis to rotate, namely circumgyrate workbench. In circumgyrate system, as a result of clearance of transmission deputy existence, cause circumgyrate displacement lag at command signal, in retrorse when create backlash, affect fixed position precision, produce mechanical concussion and vibration at the same time, cause the machining error of the spare parts. Machine the dynamic character with good system to assure a machine tool, must deputy to drive of worm wheel worm take disappear unoccupied place step, in order to raise fixed position precision. Current, circumgyrate disappear unoccupied place orgnaization basically has: Disappear of worm of double lead worm wheel disappear of unoccupied place, double servo disappear of worm of worm wheel of two paragraphs of type is unoccupied place, unoccupied place wait, the article basically introduces worm of a kind of double worm wheel flexible disappear unoccupied place orgnaization. Plan of 1 orgnaization introduction is shown 1 times for worm of double worm wheel flexible disappear unoccupied place orgnaization, deputy worm 12 with deputy transmission shaft 11 use key connection, deputy worm 12 can axial is mobile, washerbed down the livestock the ply of 14 makes dish reed 13 generation deformation, adjust deputy worm thereby 12 with worm wheel of 9 beforehand pressure, deputy worm the right tooth flank of 9 sticks the left tooth flank of 12 and worm wheel close, deputy worm 12 drive worm wheel 9, make worm wheel the left tooth flank of 9 and advocate the right tooth flank of 8 sticks worm close. According to right hand formula, when workbench arranges hour hand to rotate, deputy worm 12 deliver load, conversely, advocate worm 8 deliver load, no matter workbench is suitable, anticlockwise rotational, 12 all have deputy worm one tooth flank and worm wheel clench the teeth, achieve the goal that eliminates tine side gap thereby. Dish reed of 13 press muscularity canzonet to rectify beforehand must proper, pressure is too great, worm wheel the tooth flank of 9 wears away accelerate, pressure is too little, do not have the effect with unoccupied place disappear again. In this drive catenary, bevel gear 5, 6 for 5 class precision, decelerate machine is exact form, adjust bevel gear 5, the tine of 6 is unoccupied place for 0.

02~0.

04 Mm, servo electric machinery and decelerate electric machinery use unoccupied place locking of very close to each other to join, the shaft coupling that decelerate machine uses nicety not to have clearance 3 with advocate 7 join of transmission shaft. The adjustment of reed of 2 worm dish and odd the computation of a F of quantity of dish reed deformation 2.

Worm of 1 worm wheel suffers force to analyse workbench to use static press bearing bearing, carring capacity 10 000 Kg, because moment of inertia is bigger, requirement 2r/min, be about to make workbench divide evenly fast rotate, worm needs to offer corresponding moment of force to overcome the attrition moment of force between workbench and workbench base, the deformation that the axial force of worm produces by dish reed will offer. The basis is academic and mechanical, inside the plane that circles fixed axis to rotate its balance equation to be: If the graph is shown 2 times, surface contact is between workbench and workbench base, attrition moment of force arises by attrition force, because attrition force is all cloth is on whole mesa, reason is nodding the moment of force of place to be able to pass integral method to get with worm wheel contact. By the graph 2 can roll out the following formula: By balance type (1) reach form (2) , (3) , (4) can roll out: In type: M1 is workbench load moment of force, n · M; M2 is the moment of force of worm, n · M; F2 is the axial force of worm, n; F1 is the attrition force of workbench and workbench base, n; M1 is workbench load, kg; M2 is workbench quality, kg; μ is attrition factor; G attachs most importance to force acceleration, m/s2; R is workbench radius, m; R is radius of worm reference circle, m. 2.

The compression of 2 dish reed measures computational dish reed to be tightened beforehand use combine to closing (series connection is combined) 4 dish reed, if pursue,3 are shown. By mechanical knowledge, check mechanical design manual, load of knowable dish reed and metabolic computation are formulary: In type: Fz is dish reed total load, n; Hz is measured for dish reed total deformation, mm; F is sheet piece dish reed load, n; F is sheet piece dish reed deformation, mm; I is number of pair of reed adding up to dish, i=4; ￡ is Poisson comparing, spring steel takes ￡ =0.

3; E is stretch model quantity, spring steel takes E=206 GPa; T is the ply of dish reed, mm; H0 is planish deflection, mm; D is dish reed internal diameter, mm; D is dish reed external diameter, mm; K1, K4 is computational factor, can check mechanical design manual by C=D/d, choose K1=0.

686, dish reed does not have the face that prop up, take K4=1; H0 is sheet piece the free height of dish reed, mm. The axial force of worm produces deformation to offer by dish reed, reason: Era enters type (9) , can push cipher out to issue sheet in F2 load piece dish reed deformation measures F. 2.

The make repairs and supply replacements of 3 gasket by type (8) the total form that can promote reed of cipher out dish to combine is variable: Hz=4f. Make deputy worm the right tooth flank of 9 sticks the left tooth flank of 12 and worm wheel close, measure washerbed down the livestock 14 with deputy worm the distance L of 12, 12 nap quantity is hypothesis deputy worm when λ , washerbed down the livestock the 14 height after with deputy worm the distance of 12 is equal to dish reed combination to compress Hz, derive namely next type: By type (11) can calculate a nap quantity λ , take nap quantity to be less than λ commonly, assemble finishing later, rotate the degree of tightness that workbench feels spacer, redo is proper nap, this workbench uses full closed-loop control, the requirement is retrorse when circumgyrate, the system does not have oscillation, precision of the smallest graduation is 0.

001 ° , fixed position precision is ± 5 ″ . 3 last words use worm of double worm wheel flexible disappear unoccupied place law, in the transverse tooth thickness of worm wheel worm and week red-letter day discrepant circumstance falls, can maintain unoccupied place clench the teeth of very close to each other from beginning to end, with other pass the time in a leisurely way photograph of unoccupied place structure is compared, not only the demand that reduced pair of worm wheel worm to machine precision, still reduced finished cost, be in at the same time worm wheel worm deputy after wearing away but self-correcting compensates clearance. CNC Milling CNC Machining