The craft parameter to circularity influence of raceway groove of grinding bearing inner ring the rule

Summary: ? Angry  of sole of an ancient small-mouthed wine vessel of negative old man of the waterlogged collect that catch magpie controls file of  of a surname of Qia of ハ of associate Dang Qu  of Zou of honest of Pi of eight of Piao of Qiong of Bao of Qiong Xu postscript carries file of  of a surname of Qia of ハ of  model  5 neon of the waterlogged  that catch Ran circles a kind of bag idle of an ancient type of banner hoisted on a featherdecked mast of Chinese toon of  of Qiong stand upright, the working precision that affects bearing directly, smooth sex and service life. Grinding is the semifinishing machining of inner ring raceway groove or finish machining working procedure normally, have conclusive effect to the circularity of raceway groove of finished product inner ring, the circularity of grinding of inner ring raceway groove besides depend on outside the precision of grinding machining complex and dynamic character, return the craft parameter with grinding closely related. Former, already took seriously for a lot of scholar place, had much research, improved the circularity of raceway groove of grinding inner ring greatly thereby. As precision of grinding machining complex raise the improvement with dynamic character, grinding craft parameter becomes the main factor that affects circularity, because this studies grinding craft parameter is right the influence rule of circularity, to parameter of logical choice craft, ensure the grinding circularity of bearing raceway groove, the craft parameter that realizes grinding bearing raceway groove then is optimized, have important sense. Graph 1 it is raceway groove of grinding bearing inner ring the error circumstance of sectional real profile and ideal outline, in can expressing to be type of Rw(F)=Rw(F)-Rw0(1) of geometrical appearance error, rw(F) is radius of real work outline, rw0 is radius of good work outline. In the graph, the geometrical appearance center that O1, O2 is workpiece respectively and measure centre of turning circle. Outline error Rw(F) is the periodic function of F, progression of usable Fu Lixie expresses as in type of I=1xicos(iF+Fi)2(2) of Rw(F)=x0+ ∞ Σ : XI(i=0, 1, ... ) for harmonic amplitude: F, Fi is harmonic phase angle: X0/2 delegate processes on size error, also be the average of error function Rw(F) . Type (in 2) , what center of geometry of the circle outside raceway groove of harmonic X1cos(F+F1) corresponding inner ring measures centre of turning circle relatively is prejudicial: Come 2 times 15 times the circularity that of correspondence of 15) of ≤ of I of harmonic Xicos(iF+Fi)(2 ≤ is the circle outside bearing raceway groove. The raceway groove of inner ring of bearing of influencing factor analysis of 2 circularity is used normally change means of feed speed infeed grinding, can be its grinding divided circularly for: ? ⑾ of  of  of paper of ⒋ of  of Gu of Fen of ぜ  stew adds postscript of S of lofty of awl of soft-shelled turtle of mother of Liang of ハ of  of  of   buttock leavessing of pulse plants to wick archives of discharge of Ke of ハ children's hair is waterlogged the precision of the machining complex in catching magpie to be troubled by Mie of Tao  Qiong to bask in process of grinding of?(1) of Bin part of the day, this depends on parameter of the fixed position principle of the precision of grinder and clamping apparatus, structure and precision: (2) the trends of machining complex is characteristic, especially the balance position of emery wheel: In nap and grinding process, emery wheel is lopsided, can cause force vibration, as a result of the nap when nap emery wheel implement the difference of the relative position of the workpiece when the relative position with emery wheel and grinding and emery wheel, and what these two kinds of different situations issue machining complex stiffness is different the workpiece surface out of round that makes vibration causes grinding: And the contacts stiffness, emery wheel wear process that grinding craft parameter can affect emery wheel and work and the damp with oscillatory machining complex are characteristic, the vibration that affects grinding process thereby is characteristic, the geometrical figure that reflects finally in grinding workpiece (namely circularity) go up with other surface quality: (3) the flexibility of machining complex is out of shape the work that cause is original error answer mirrors: Rule of change of error of appearance of geometry of workpiece of analytic grinding loop is knowable, error answer mirrors the workpiece geometry appearance after grinding to basically depend on parameter of craft of machining complex stiffness, grinding, emery wheel wears away speed and work are original error. Consider above influencing factor integratedly, when machining complex stiffness and dynamic character are particular (especially emery wheel must pass good balance) , the circularity error of grinding workpiece basically depends on grinding craft parameter, because this can pass the progressively regression of data of pair of grinding circularity test to build a model, choose important parameter from inside much craft parameter, introduce recursive equation stage by stage, build the best regression equation of grinding circularity and craft parameter relation thereby. Level of element of test of 3 tests program expresses horizontal element Vw(m/min)a1(µm/r)a2(µm/r)Sd(mm/r)td(mm)T(mm3/mm)L2(mm)13040.

50.

10.

011T00.

025250.

5810.

20.

025T0383121.

80.

30.

0310T00.

04 note: ? Anchor Xiao 0 for sheet unit polishing width is ground except workpiece bulk, this experiment T0=7.

07mm3/mm. The analysis of influencing factor of grinding workpiece circularity is faced before the basis, factory of give attention to two or morethings produces the limitation of condition and equipment performance, the intercrop when stiffness of Vs, machine tool and dynamic character and light grind linear velocity of the function emery wheel and grinding fluid, emery wheel is changeless element, keep stable as far as possible in grinding experiment process. Study the experiment element: of the choice originally? D of Ta of draw water of male of Pan  abstruse value, every time Td of deepness of journey nap emery wheel, workpiece linear velocity Vw, thick feed workpiece every turn grinding deepness A1, fine feed workpiece every turn grinding deepness A2, l2 of fine feed journey, unit polishing width is ground except metallic bulk T. Each craft parameter takes 2 levels except L2 of fine feed journey outside, the others all is taken, level, between consideration craft parameter alternant effect, by mix model orthogonal watch has a test. Cause emery wheel equivalent to mirror different workpiece diameter at the same time the diametical change influence to grinding circularity, be opposite in order to part 208, 308 undertake with 306 bearing grinding experiments, measure the circularity of grinding workpiece. Experiment element level sees right on watch. Experiment condition: (Is 1) machine tool 3MZ1310: ? Way of location of work of?2) of Bo of ゴ of excessive of archives of  of a surname of heart of Ke of Jiu of Dong of  far  moves bearing for double circular arc: (3) emery wheel is GB100ZR2A, diametical Ds=560mm, rotate speed Ns=1600r/min: (4) nap tool is sheet diamond nap implement, light repairs: (5) light rubs time 2.

5s, common emulsion cooling fluid: (Taylor-HOBSON of 6) circularity measuring instrument: (7) grinding workpiece is 208, 306, the raceway groove outside 308 bearing inner ring, diametical Dw=48.

1, 40, 51mm, material GCr15, hardness 60 ～ 65HRC. The model of the maths that build a model of 4 grinding circularity and craft parameter relation faces grinding circularity influencing factor to analyse before hypothesis basis, the consideration may put the alternant effect that be in between craft parameter, the R0 in can assuming the mathematical model of grinding circularity is R0= KVwa1a1a2L2a3D4a4Twb1Sdb2ab23tdb4b1=p1+lnVwb1a1b2Tb3Sdb4a2b5Deb6b2=p2+c1lna1+c2lnSdb3=p3+dlna1b4=p4+f1lnSd+f2lntd(3) type represents circularity value, the others is mixed for craft parameter wait for calm constant, de=dsdw/(d3+dw) of diameter of emery wheel equivalent. Adopt pair of form (after 3) both sides takes logarithm and into travel variable era is changed, but Y=B0+B1x1+B2x2+ of linear melt into... + the circularity data of raceway groove of inner ring of the actual measurement after the progressively regression of circularity of raceway groove of B19x19(4) grinding inner ring builds a model to use grinding to experiment, to afore-mentioned type (the response of 3) linearization function type (4) undertakes progressively regression, introduce main factor namely, eliminate secondary element (note: FExamine critical value takes Fa=0.

4) , till both neither can eliminate, progressively regression computation ends below the case that can no more introduce variable again. Decide answer function type (the value of coefficient of 4) each independent variable, again the response after linearization function generation is changed recover from an illness, parameter of attainable grinding craft and the mathematical model that circularity concerns are R0=0.

0623Vw0.

442a13.

262L20.

201De1.

08Tb1Sdb2a2b3tdb4b1=-0.

335lna1-0.

368lnSdb2=4.

833+1.

161lna1+2.

178lnSdb3=-0.

233lna1b4=-0.

S=0 of 441lnSd(5) standard deviation.

36, correlation coefficient G=0.

94, f=26>Fa=0.

The 4 correlation coefficient that build a model from place and variance analysis F examine the value is knowable, plan to add up to the effect to compare satisfaction, the model is feasible. 5 results and discuss (note: A1=8µm/r, a2=1.

5µm/r, vw=50.

5m/min, l2=0.

03mm, de=45mm, the metabolic case that T=58mm3/mm) graph 2 R0 follows Sd, Td (note: SD=0.

15mm/r, td=0.

02mm, vw=50.

5m/min, l2=0.

03mm, de=45mm, the metabolic case that T=58mm3/mm) graph 3 R0 follows A1, A2 (note: SD=0.

15mm/r, td=0.

02mm, a1=8µm/r, a2=1.

5µm/r, de=45mm, l2=0.

The metabolic case that 03mm) graph 4 R0 follows Vw, T (note: SD=0.

15mm/r, td=0.

02mm, a1=8µm/r, a2=1.

5µm/r, vw=50.

5m/min, the metabolic case that T=58mm3/mm) graph 5 R0 follows De, L2 pursues the relation of the 2 lead that show nap emery wheel and deepness and grinding circularity R0. In the graph, when Sd<0.

When 16mm/r, as nap lead Sd reduce, the circularity of grinding increases: But when Sd>0.

When 16mm/r, the circularity of grinding increases along with the accretion of nap lead, in Sd=0.

16mm/r place, circularity amounts to dinky value. As the accretion of deepness of emery wheel nap, the circularity of grinding increases by degrees. Graph the 3 concerns that express thick feed and deepness of fine feed grinding and grinding circularity. From inside the graph knowable, the accretion of thick feed and deepness of fine feed grinding, all make the circularity of grinding is reduced with different level, follow the accretion of A1 of deepness of thick feed grinding among them, the scope that grinding circularity reduces and A2 of deepness of fine feed grinding are concerned, a2 is bigger, the amplitude that circularity reduces is bigger also. Graph 4 state Vw and unit grind workpiece linear velocity the concern that removes metallic bulk T and grinding circularity. The circularity of grinding increases along with the accretion of workpiece linear velocity, and the unit grinds the change that divides metallic bulk to do not have apparent effect to the circularity of grinding. The specification wears away normally in emery wheel level, the sharp condition of emery wheel surface does not affect circularity. Graph the 5 concerns that express De of diameter of equivalent emery wheel and L2 of fine feed journey and grinding circularity R0. Apparent, the accretion of fine feed journey and De of diameter of equivalent emery wheel, all make the circularity of grinding increases. This agrees with the conclusion 2 o'clock. Is what final need points out: ? Does Zi of  of  of Xi of cabin of  of act of Lu of  of plaque of Qiong of  of Lu of Zha of Piao of abstruse establish yellow glue subtle head of  of ぜ of Bei of postscript wicking ハ is caught now take 13  to brush beard of ぷ of personal Mei grave to prick  exuviate abstruse to regretful of tall of  of Guo of glue of personal Mei natrium Li? CNC Milling