Planar and abrade accident uses the analysis of parameter and calculation

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Mechanical and abrade method is current domestic and international blade grinds hard metal but on dislocation razor blade, the lower end is planar (razor blade of alloy of the following abbreviation is planar) a kind of main method. Especially but dislocation mill razor blade and the exacter level that are used on machine tool of machining center, numerical control, transfer matic but dislocation razor blade, our country most factory is to use abrade Falaijia to be versed in its go up, next making the same score. Abrade razor blade is planar, undertake on planar muller normally. The abrade quality stand or fall of bit plane and productivity discretion, grind millstones wears away uniformity, separator wears away degree, try very hard to control at will by operation personnel, but having affinity with the abrade motion of muller and athletic contrail however, concern of as logical as abrade motion parameter choice is very big. This article is planar muller is the connotation of abrade motion parameter, right the respect such as the make choice of of the parameter of planar muller motion of the athletic parameter computation of the influence of abrade surface quality and productivity, abrade executive machinery and new design, offer oneself view. The main movement parameter of 1 planar muller is current, domestic and international blade adjusts the muller of plane of golden razor blade, from the point of athletic condition, basically divide kinds of big: ? Shine humerus of Suo apology quilt covers? of  of large of thieve having enough separator makes prejudicial motion a kind, former call planetary type muller, latter calls prejudicial type muller. According to foreign data, the main movement parameter of muller of planetary type plane is: (The cycle of speed of average rate V;(2) that 1) work look grinds dish of motion to grinding alternates coefficient λ , it expresses Vmax of the oldest rate and Vmin of the minorrest rate than, namely λ =Vmax/Vmin;(3) is tangential acceleration α . Parameter of these 3 motion is opposite V, λ , α to be machined by the surface of plane of abrade razor blade quality (wait for) like parallelism of exterior surface roughness, flatness, two end panel, abrade productivity, abrade dish wear away uniformity have very big effect. According to concerning data introduction, when speed makes periodic shift, when total excision quantity and instantaneous productivity should compare material not to alternate, come greatly. For example, to improve abrade productivity, thick grind steel when ～ of =5 extraction λ 10, λ =1 is taken when essence of life grinds. Thick grind silicon when ～ of =2 extraction λ 4, v=40 ～ 70m/min, essence of life grinds silicon when ～ of =1 extraction λ 1.

3, v=100 ～ 180m/min. Better by abrade surface quality, productivity is tall also. Classics experiment makes clear, on planetary type muller, use diamond abrade makings is abrade alloy razor blade is planar, thick V=40 ～ 60m/min is taken when grinding, v=100 ～ is taken when essence of 3; of λ =2 ～ grinds 120m/min, λ =1.

1 ～ 1.

5 when, its are abrade quality and productivity all more satisfactory. Because 3 parameter affect V, λ , α ,be mixed by the treatment quality of plane of abrade razor blade productivity, accordingly, muller of new design plane should be main basis with parameter of these 3 motion. The planar muller that muller of plane of 2 planets type carries the analysis that uses parameter and computational separator make a planet move is 3 sort model, it is to go up, next grinding millstones is fixed do not move, abrade campaign finishs; completely by the planetary motion of separator 2 it is to go up, next grinding millstones rotates, separator makes planetary motion; 3 be next grinding millstones rotates, millstones grinds to drift only on, separator makes planetary motion. Application is the widest is the 2nd kind, accordingly, computation is analysed only here the motion of muller of type of the 2nd kind of planet and athletic parameter. On, next grinding millstones rotates, the working principle of the muller of double end panel that separator makes a planet move. Planetary actuator includes central annulus (or sale in domestic market child dish) 1 with internal gear (export child dish) 3, its rotate speed is N1 and N3; separator respectively (planetary gear) 2 at the same time with the center annulus 1 outside clench the teeth, with internal gear 3 inside separator of; of clench the teeth (planetary gear) 2 circle axes rotation at the same time, circle central rotate again at the same time revolution motion, alloy razor blade 6 place respectively in separator the detached Kong Zhong of 2, by abrade dish 4 and 5 come abrade treatment, grind the rotate speed of millstones imagines department staff for N4 and N5; respectively the rotate speed of 7 is N7, criterion planetary gear (separator) 2 tie staff with the hypothesis 7 grind dish of rotate speed of 5 to be at next grinding relatively: N25=n2-n5=n35[1-i13(z1/z3)]/1-z1/z3 (1)n75=n7-n5=n35[1+i13(z1/z3)]/1+z1/z3 (2) among them, n35=n3-n5;i13(n1-n3)/(n3-n5);z1, z3, gear 1 with gear the tine of 3 is counted. N25, n75 is the basic data of affirmatory V, λ , α . Set in be assumed office to take a bit C by abrade alloy razor blade, criterion C dot photograph grinds to falling the athletic speed of millstones changes between Vmax=VB+VCB and Vmin=VB-VCB (among them VB chooses career for B, VCB nods the speed) that nods at B relatively for C. C nods each periodic and effective average rate to be able to be calculated by formulary V=Lc/Tc (among them the orbit length that Lc nods each campaign cycle for C, tc is periodic) . C nods V of actual and average rate and VB of B aspect rate to have a bit different, can press type is calculated approximately: VThe R7 in type of R7n75 (3) of ≈ VB=Vmax+Vmin/2=2 π , the hypothesis ties staff the radius of 7, namely R7=OB, n75, department staff 7 photographs grind dish of rotate speed of 5 to next grinding, but by (2) type is begged. Can λ of coefficient of speed cycle commutation press type is calculated: ? ?Vmax/Vmin=1+ | I27 | Rc/r7/1- | I27 | In Rc/r7 (4) type, rc, the radius that C dot nods relative to B, namely Rc=CB;i27=(n2-n5)/(n7-n5)i27, dot of the C on planetary separator grinds dish of drive of 5 to compare at next grinding relatively. C dot grinds dish of orbit appearance of 5 at grinding relatively, can be decided by transmission than I27, when I27<0, contrail of C dot motion shows hypocycloid; to become when 0<i27<1, orbit shows week of cycloidal; to show epicycloid when I27>1. Basis (4) type is calculable the λ value that gives muller of plane of a few kinds of model of domestic and drive are compared | I27 | , draw concerns into the curve. Can come by foregone λ value according to this graph value of I27 of make choice of. Central annulus (sale in domestic market child dish) 1 with internal gear (export child dish) 3 grind dish of drive of 5 at next grinding relatively is the computation of I15 as follows: ? Row the drive of 3 compares solemn? and internal gear I13 but by (1) type and (2) type is gotten for: I13=(1+z3/z1)+(1-z3/z1)i27/(1+z1/z3)+(1-z1/z3)i27 is become planar muller internal gear (export child dish) 3 fixed when be not being moved, namely N3=0, reach at this moment: IThe I15 in 15=n1/n5=1-i13=(1-i27)(z1/z3-z3/z1)/(1+z1/z3)(1-z1/z3)i27 (5) type, central annulus 1 photograph is compared to grinding dish of 5 drive at grinding. Basis (the concern that 5) form calculation gives I27 of 3 kinds of planar muller and I15, draw becomes a curve. Want to know I27 can use the value of I15 of this graph fish only. After Nextpage decides than I15 when transmission, optional center annulus mix next grinding the rotate speed N1 of millstones and N5. And N1 and N5 must assure given after V is worth; to know when speed V value, can connect on (3) type is gotten: N75=V/2 π R7 is like internal gear (export child dish) 3 fixed do not move, namely when N3=0, criterion N35=n3-n5=-n5, i13=1-i15, go up (1) type turns into: N5=-n35=-n75(1+z1/z3)/1+(1-i15)z1/z3 (6) presses formula (a few N5 are worth 6) plan cipher out, should choose N5 value and corresponding N1 value according to need (N1=n5i15) . Be like planar muller on, next grinding millstones is fixed do not move, abrade campaign is finished completely by the planetary motion of planetary separator (the first kind of) , at this moment when N5=0, n3 ≠ 0, criterion after cipher out I13 and N75 are worth, press type begs a N3:n again35=n3-n5n3=n35+n5=n75(1+z1/z3)/1+i13(z1/z3) (7) seeks cost giving N1 again finally (N1=n3i13) . The planar muller of 3 new designs basically moves the make choice of of parameter 3.

1 motion and result of athletic contrail test make clear, must the abrade motion of the planar muller of new design and athletic contrail satisfy: of the following requirement? Plane of razor blade of alloy of show off? is opposite at grinding the athletic way of millstones should change ceaselessly, such ability can avoid to have grain grinding; the 2nd, ought to make every bits of photograph on bit grinds dish of abrade distance that go up to grinding equal, the surplus with identical abrasion grinds in order to assure on bit, maintain the flatness of bit plane and the parallelism of two transverse plane, make grind millstones working face wears away even; the 3rd, to get used to thick, essence abrade, ask abrade speed V and speed cycle alternate coefficient λ can undertake adjustment. According to above 3 ask, the muller of new design, its job principle, it has the following characteristic: (It issues 1) only abrade dish 5, its direction of rotation and central gear wheel 1 contrary, and with separator the direction of rotation of 2 is identical, n5 of millstones rotate speed and N2 of separator rotate speed should grind below the change only, attainable λ of different periodic commutation coefficient, can undertake on a muller thick grind and grind. (2) by abrade razor blade 6 place in the clapboard inside separator 3 in, separator by platen 4 fixed position, central gear wheel 1 drive rotate, these 4 separator circle platen axes rotation only, do not make turn. (3) platen 4 control alone by piston of hydraulic pressure crock, give alloy razor blade certain and abrade pressure, want piston of hydraulic pressure crock to taking platen upgrade to carry only, separator can be rolled out alone, facilitating razor blade assembles and unassemble or detect. (4) classics analyses computation, the holds the post of a bit C motion contrail on the razor blade inside this muller separator is abnormal epicycloid or call short an epicycloid. Concern data introduction according to abroad, contrail of motion of epicycloid, hypocycloid, its are abrade journey oneness is better, motion is smooth, can better land takes work whole and abrade dish of surface. Athletic contrail shows cycloid is this muller important characteristic. 3.

2 speed V and grind the basis of make choice of of N5 of millstones rotate speed needs, muller grinds certainly D=<500mm of millstones external diameter, internal diameter D=<170mm, through computation of long research, analysis, v value is taken: 50 ～ 120m/min is more satisfactory, when V=50m/min, n5min=48.

When 25r/min;V=120m/min, n5max=115.

8r/min. To simplify gearing, muller is used double fast electromotor, make choice of of will actual rotate speed is N5=50r/min, 100r/min two kinds. When × of π of Dn5/1000= of π of the Vmax= when N5=50r/min 500 × 50/1000=78.

160 × of × of π of 5m/minVmin= π Dn5/1000= 50/1000=25.

V=Vmax+Vmin/2=78 of 12m/min average rate.

5+25.

12/2=51.

81m/min is become when N5=100r/min, computation goes out: VMax=157m/min, vmin=50.

24m/min, v=103.

62m/min. Computation makes clear as a result, v=51.

81, 103.

62m/min, accord with: V=50 ～ the requirement of 120m/min. 3.

λ of coefficient of commutation of 3 speed cycle and N2 of separator rotate speed are decided really go up to already was mentioned, grind with diamond abrasive is abrade hard alloy razor blade is planar, thick λ =2 ～ is taken when grinding 3, λ =1 is taken when essence of life grinds.

1 ～ 1.

5, according to λ span, can calculate an essence fast N2. Because muller is abrade direction of rotation and dish of separator are identical, reason is abrade dish most outside aspect rate Vmax and direction of separator speed V2 are consistent, most inside dot Vmin and V2 way are opposite, get: so? ?Vmax-V2/Vmin+V2, v2=Vmax-Vmin λ / 1+ λ are become when N5=50r/min, at this moment: VMax=78.

5m/min, vmin=25.

12m/min, thick grind =2 extraction λ , criterion V2=Vmax-Vmin λ / 1+ λ =78.

5-25.

12 × 2/1+2=9.

42m/min, × of N2=1000V2/ π D2=1000 9.

170=17 of 42/ π × .

λ =1 is taken when 64r/min essence grinds.

3, computation goes out: V2=19.

93m/min, n2=37.

The D2 in 33r/min type, separator internal diameter, d2=<170mm, when N5=100r/min, vmax=157m/min, vmin=50.

When 24m/min, computational eventuate: ? ?2 of ˇ of handleless cup raw meat or fish, v2=18.

84m/min, n2=35.

2r/min essence grinds =1 extraction λ .

3, v2=39.

86m/min, n2=74.

N2 of rotate speed of affirmatory finally separator is 6r/min 17.

5r/min, 35r/min, 70r/min 3 kinds, corresponding effective rate V2 is 9.

34m/min, 18.

68m/min, 37.

36m/min. Does corresponding effective rate cycle alternate coefficient λ value is: ? Bao 5=50r/min, vmax=78.

5m/min, vmin=25.

The: when 12m/min? ?=Vmax-V2/Vmin+V2=78.

5-9.

34/25.

12+9.

34=2 λ 2=78.

5-18.

68/25.

12+18.

68=1.

36; λ 3=78.

5-37.

36/25.

12+37.

36=0.

67. When N5=100r/min, vmax=157/min, vmin=50.

When 24m/min, press afore-mentioned methodological computation, get λ 1=2.

48, λ 2=2, λ 3=1.

37. 4 actor choose a result to pass above analysis and computation, planar muller grinds make choice of of millstones revolution N5 is 50r/min, 100r/min two kinds, n2 of separator rotate speed is by make choice of 17.

5r/min, 35r/min, 70r/min 3 kinds, corresponding main movement parameter (tangential acceleration α computation is omitted) see by the watch, this muller has 6 kinds of speed change, can use rough machining, also can use at finish machining and careful treatment. CNC Milling