The computation that Cp of diameter of workpiece of MS lathe cutting is worth

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One, summary: By the requirement that machines precision at Zuo bed, suffers Yin of dimension of spare parts to consider its poor, this tastes Zuo to control main tool of the method, difference is the dimension on one average size quantity of the that divide , of of root differs Yin to calculate Cp (capability Of Precision) of Xuan Cheng precision, by Cp the value can be decided the Chu sex of precision of treatment of this Zuo bed. The Cp value that can decide by place Yu again pushs cipher out to machine the Yu Yin of dimension public errand to be worth, the Cp that asks to place with Zuo is worth. 2, the formula that Cp is worth pushs : Before Yin calculates Xuan Cheng precision Cp, the that needs Zuo gets measure of spare parts sufferring first is poor. By of place of dimension of spare parts sufferring unripe Zuo leads Jin of music of Xuan of dimension Kui , a Zuo of dimension cent that of Jin of music of as usual can see A Jian is concentrated, b Jian take second place, c Jian is the poorest. The value measuring that of root N gets measure of spare parts divides X1, x2, .

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, xn, but Yin calculates his average Fs24 X is shown as follows: (1) but Yin considers its poor (１ ) following place show: (2) but Yin calculates precision of its Xuan Cheng (2) following place show: If the Ji such as 2 Cp divides place to show, cp value is great at 1.

33 namely A Ji , cp is worth interpose at 1 Ning 1.

The Ji of Zuo B of 33, cp is worth interpose at 0.

67 Ning the Ji of Zuo C of 1, cp value is little at 0.

67 namely D Ji , cp value states Xuan builds Jian fruit to heal greatly more nicety. 3, the Cp value of measure of work of cutting of MS Zuo bed: of measure of work of cutting of MS Zuo bed, f1, the Yu Yin dimension of F2 divides 45 Mm of Ning of 44 Mm, value of Yin of Yu of its public errand divides 0.

015 Mm Ning 0.

012 Mm, 45 of machine the F1 of the spare parts, if the watch is shown 1 times,the quantity of 2 Jian dimension is worth F2, depends on formula (1)~(3) divides but Yin of Yu of difference of of each Jian average, , public errand is worth Yin cipher out the value that reach Cp, row at the watch of 1 pour 4 in. Root expresses the Jian fruit of 1 to be able to see: 45 +-0.

015 Mm =>Cp = 1.

401 45 +-0.

012 Mm =>Cp = 0.

Zuo of of of this Jian of 946 　 shows the Cp of 44 the value is great at 1.

33, root the Ji of A of the that decide Li of 2, the Cp of 45 is worth C Ji , the treatment precision beautiful of F44, and the treatment precision Zuo of 45 is poor. Because this improves the Cp value of 45, the Yin of tolerancepublic errand Yu with former is worth by 0.

012 Mm rises to 0.

015 Mm, but 45 +-0 of Yin cipher out.

015 Mm =>Cp = 1.

186 if want value of its Cp to rise,come A Ji , value of Yin of Yu of its public errand needs Zuo rises to 0.

017 Mm, namely 45 +-0.

017 Mm =>Cp = 1.

Value of Yin of Yu of the cutting workpiece straight of 342 above, public errand and Cp value are listed at the watch 2 in. Nextpage expresses of average of 1 each Jian , 　 of 　 of 　 of 1 of straight of 　 　 of value of Yin of Yu of difference, public errand and Cp value 　 (　 of 　 of 　 of 2 of straight of 　 of 　 of 　 of 　 of 　 of 　 of 　 of 　 of 　 of 　 of 44 Mm) ( of volume of order of 45 Mm) workpiece is worth (.

00024 44.

0031 44.

99724 45.

0072 43.

99925 44.

0042 44.

99825 45.

0023 43.

99926 44.

0043 44.

99826 45.

0024 43.

99827 44.

0024 44.

99827 45.

0015 43.

99828 44.

0035 44.

99528 45.

0016 43.

99629 44.

0036 44.

99629 45.

0027 43.

99830 44.

0037 44.

99530 45.

0028 43.

99731 44.

0048 44.

99331 45.

0029 43.

99732 44.

0059 44.

99432 45.

00410 43.

99633 44.

00410 44.

99333 45.

00211 43.

99634 44.

00511 44.

99534 45.

00412 43.

99835 44.

00512 44.

99635 45.

00613 43.

99936 44.

00513 44.

99636 45.

00314 43.

99737 44.

00514 44.

99537 45.

00415 43.

99938 44.

00515 44.

99638 45.

00516 43.

99839 44.

00716 44.

99739 45.

00617 43.

99940 44.

00717 44.

99640 45.

00618 43.

99840 44.

00718 44.

99840 45.

00519 43.

99942 44.

00719 44.

99842 45.

00720 43.

99943 44.

00620 44.

99843 45.

00521 44.

00044 44.

00621 44.

99944 45.

00722 44.

00145 44.

00722 44.

99945 45.

00623 44.

23 45 of 001 　 　 .

000 　 average 44.

0015 (mm) average 45.

of 0002 (mm) is poor 0.

of 0036 (mm) is poor 0.

Yin of Yu of 0042 (mm) public errand is worth 0.

Yin of Yu of 030 (mm) public errand is worth 0.

024 (mm) Cp 1.

401Cp 0.

946 watches value of Yin of Yu of straight of 2 cutting workpiece, public errand and Cp are worth straight ( Yin of Yu of Mm) public errand is worth (the Ji such as precision of Mm) Cp value 440.

015 1.

401A 450.

012 0.

946C 　 0.

015 1.

186B 　 0.

017 1.

342A 4, Jian Zha : By the watch 2 can see Yin of Yu of F44 public errand is worth 0.

015 Mm , its Cp is worth 1.

401 state its machine precision special spirit Chu . And the dimension of F45, if Yin of Yu of its public errand is worth 0.

012 Mm , its Cp is worth 0.

946 state its machine precision Zuo difference, and the method that improves Fs24 Cp value is enlarge of value of Yin of Yu of public errand namely to 0.

017 Mm, be worth the precision to A Ji in order to raise Cp, at Li of another meaning character, cp is worth too small Yi Ke to be able to state Yin of tolerancepublic errand Yu is worth Zuo at exacting. CNC Milling CNC Machining