Bewise Inc. www.tool-tool.com Reference source from the internet.

一、磨削加工类型

磨削加工可分为下列几种类型(见图143)

(1) 外圆磨削,包括外圆纵磨、外圆横磨和大切深缓进给磨削;

(2) 内圆磨削;

(3) 平面磨削;

(4) 成形磨削,包括螺纹磨削;

(5) 砂带磨削;

(6) 无心磨削,包括内圆无心磨削;

(7) 砂轮切断;

(8) 超精磨削加工,包括绗磨、抛光、研磨和液体抛光。

二、磨削运动

磨削时,一般有四个运动,如图144所示。

(1)主运动Vc:是砂轮的旋转运动。主运动速度是砂轮外圆的线速度,

(m/s) (141)

式中d。砂轮直径,mm;

n。砂轮转速,r/s

Vc——砂轮线速度;即磨削速度,m/s。

(2)径向进给量fr:工作台每双(单)行程内工件相对砂轮径向移动的距离。其单位为mm/d·str(当工作台每单行程作进给时,单位为mm/str;当作连续进给时,单位为mm/s)。一般情况下,fr=0.005—0.02mm/d·str

(3)轴向进结量fa:工件相对砂轮沿轴向的进结运动。一般情况下fa=(0.20.8)B;B为砂轮宽度,单位是mm;fa的单位,圆磨是mm/r,平磨是mm/(d·str)。

(4)工件速度Vw

外圆磨削时

(142)

平面磨削时

(143)

式中 Vw工件速度,m/s;

L——工作台行程,mm,

dw——工件直径,mm;

nw——工件转速,r/s;

ntab—工作台往复频率,s-1

三、磨削时金属切除率

磨削时,每秒钟金属切除量

Q=1000·Vw·fr·fa (mm3/s)

Q亦称为切除率,它表示磨削的生产率。而每秒钟内砂轮每1mm宽度所切除的金属量,则称为单位砂轮宽度切除率,以QB表示:

[mm3/(s·mm)] (144)

式中 B—砂轮宽度,mm。

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