位置度量规设计计算过程

检具计算说明

要求测量M8螺纹空位置度①0.4。

M8螺纹孔在位宜度检测时根据最大时效尺寸可当做①6.647誉心，° = 6.647〃〃" 采用台阶式插入型功能量规

D、、w = D、、厂t ?)=6. 647-0. 4=6. 247mm

T, = T 】)+ T、、产°?265 + 0.4 = 0.665mm

由表一可査得

T 产W| = 0.012mm

7； = W= 0.008mm

S 二0.005mm

—mm

(=0. 02mm

11 = 0.006mm

由表二可得

p(=0.063mm

对检验部位有

dm = Dm =6.247mm

d. = (%+”)〉(6.247+0?063)二=6.31 爲呷

diw = (d IB+Fl)一(Ti+W|)=(6247+0.063) -(0.012+0.012) = 6.286mm 对导向部位

取d G B = DGB=8inin

D( ；W = D GB +(T G + W(；)= 8 + (0.008 + 0.008) = &016mm

d G=(d GB-S min)l T( = (8—0.005)：驱=7.995爲呷d GW =(d GB-S n,n)-(TG+Tw)=(8-0.005)-(0.008+0.008)=7.979mm

对加位部位

(|>28.8± 0.2mm

dkB = D M = 28.6mm T, = 0.4mm

由表一

T] =Wi. = 0.012mm

=28.6 -0.012

dk=dLB_Ti

duv = di.B 一(Ti+W J = 28.6 - (0.012+0.0 ⑵=28.576mm