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硬质合金立铣刀

发布时间:2013-08-08

铣刀是一种应用广泛的多刃回转刀具,其种类很多。按用途分有:1)加工平面用的,如圆柱平面铣刀、端铣刀等;2)加工沟槽用的,如立铣刀、T形刀和角度铣刀等;3)加工成形表面用的,如凸半圆和凹半圆铣刀和加工其它复杂成形表面用的铣刀。铣削的生产率一般较高,加工表面粗糙度值较大。
     铣刀与钻头是机械加工用得最多的整体刀具,其种类也相当的多:
a) 圆柱铣刀——>加工狭长平面
     分为粗齿(粗加工)和细齿(精加工)
b) 面铣刀——> 加工大平面
c) 三面刃铣刀——>铣弧尾槽、通槽、台阶面(刀宽精度较高)
d) 锯片铣刀——>铣窄槽、切断
e) 立铣刀——>加工圆头槽、通槽、台阶面、侧面
f) 键槽铣刀——>铣圆头封闭键槽
f) 指状铣刀——>铣各种模具型腔
h) 角度铣刀——>铣各种斜面、斜槽
i) 成形铣刀——>铣各种成形面
1.常用铣刀简介
(1)圆柱铣刀 :用圆周上的刀刃进行切削
① 外径D :50、63、80、100 ; 孔径 :22、27、32、40
② 选刀原则 :L刀 > B工件 ;D尽量小
(3)键槽铣刀 :
① 分为直柄和锥柄;
② 特点:
a) 只有两个刀齿;
b) 直径精度 :e8—>加工槽宽精度为H9的键槽,d8—>加工槽宽精度为N9的键槽 ;
c)端面刃为主刀刃,圆周刃为副刀刃,能轴向进给;
d)刀具重磨时只磨端面刃(直径不变)。
(4)尖齿槽铣刀 :
① 直径D = 50、63、80、100、125
② 宽度L = 4~25 ,精度k8
③ 加工H9槽
④ 端面没有刃 ,重磨后宽度变化小。
(5)三面刃铣刀
① 分为直齿(Ⅰ型和Ⅱ型)、错齿(有刃倾角)和镶齿(可恢复刀宽)    
② 特点:三面有刃,加工表面质量好;重磨后宽度尺寸变化较大    
③ 精度:外径(js16),宽度(普通级k11和精密级k8)    
④ 应用:
    单独使用:铣弧形尾的槽
    两刀组合:同时加工两侧面(两侧面的距离由中间隔套控制)    
如图:铣弧尾槽    组合铣刀    
(6)模具铣刀——加工模具型面、型腔    
① 高速钢:分为圆锥形、圆锥形球头和圆柱形球头,又分为直柄、削平型直柄、莫氏锥柄    
② 硬质合金旋转锉    
    对淬硬后(HRC<65)的模具型腔的修整、去毛刺    
2、铣刀几何角度的合理选择:
    选择依据:与车刀相同,但
① 前角:比车刀小些
② 后角:比车刀大些
③ 刃倾角:即为刀具的螺旋角
③ 分为粗齿和细齿,且两种又分为直槽(不常用)和螺旋槽(左旋和右旋)
在进行自由曲面(模具)加工时,由于球头刀具的端部切削速度为零,因此,为保证加工精度,切削行距一般采用顶端密距,故球头常用于曲面的精加工。而平头刀具在表面加工质量和切削效率方面都优于球头刀,因此,只要在保证不过切的前提下,无论是曲面的粗加工还是精加工,都应优先选择平头刀。另外,刀具的耐用度和精度与刀具价格关系极大,必须引起



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