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B-Trimming knives with bearing

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D-Straight drill form class

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E-Knife round bottom line

EA-BOWL & TRAY BIT
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F-Convex half circular knife

FA-CORNER ROUND BIT
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刀具加工用数控机床的选择要点

发布时间:2013-08-08

  金属切削刀具的种类繁多,加工方法也多种多样,本文不可能对每种刀具的CNC加工设备都进行讨论,仅从以下三个方面进行论述:1.需要几个数控轴;2.需要几个数控轴联动;3.需要什么数控系统。

  1、需要几个数控轴

  刀具一般可根据其外形分为回转刀具(如铣刀,钻头)和方形轮廓刀具(如a车刀,镗刀),因而一般都需要X,Y,Z三个数控直线轴对其进行加工以保证其外形尺寸,有所区别的是对数控回转轴的要求。加工复杂的可转位刀具体现得较为明显。

  以加工可转位立铣刀工序中的数控铣削为例

  绝大多数可转位立铣刀都有数个(条)均布的切削齿,在每个齿加工完毕后都应对其进行分度旋转(如图1所示B轴)进行下一个(条)齿的加工。如果CNC铣床没有数控分度头或数控回转工作台,则应在程序中加入无条件停止指令,机床运动停止后通过人工旋转精密手动分度头实现分度旋转(应注意机床外罩锁的影响),然后继续执行NC程序。精度一般能够满足要求。但这样会增加工人劳动强度,同时影响工作效率。如果CNC铣床有数控分度头或数控回转工作台,则分度旋转运动可通过程序中的数控指令实现,精度和效率都较高,但增加一个CNC回转轴也会使CNC铣床的结构复杂化,CNC系统功能增加,大为增加CNC铣床的价格。

  需要指出的是,精密手动分度头的分度能力是有限的,特别是对于非整数的角度往往无法满足要求(可转位成形铣刀此类情况较多),此时只能用CNC回转轴实现。此类CNC回转轴一般用交流伺服电机驱动精密蜗杆副,液压或气动夹紧,高精度编码器作为角度检测元件,因而具备在行程范围内任意角度的旋转功能。而采用端面齿盘定位的CNC回转轴却只能进行等分转度,不适用于此类情况。

  某些可转位立铣刀有刃倾角λs,在铣削刀片槽或容屑槽时都应将槽底面转刃倾角λs,使其与CNC铣刀轴线垂直,此时需要一个回转轴,旋转刃倾角λs。

  受精密手动分度头的装夹结构和刚性的限制,将其作为A轴效果不佳。因此应选择具有较高刚性的CNC回转轴作为A轴。

  可见如果某CNC铣床加工的可转位刀具品种单一且无刃倾角,可以选择3轴CNC(X,Y,Z)铣床加精密手动分度头,可降低加工成本。否则应选择5轴CNC铣床(X,Y,Z,A,B)。

  2、需要几个数控轴联动BB霜排名很好抗痘祛痘产品哪种好化妆水丰胸好用疤痕修复哪个好最好什么彩妆刷好用

  CNC系统的若干轴联动插补功能最能体现CNC系统的性能和其档次高低,也往往决定着CNC系统的价格,因此应根据加工刀具产品的具体情况来仔细选择。对于加工一般可转位刀具的CNC铣床而言,具有2个直线轴的直线和圆弧插补功能就可以加工几乎所有的ISO标准刀片槽形式,其它运动都可单轴插补完成。如果也选择多达5-6轴联动的CNC系统则没有必要。要求比较高的是一些螺旋类精加工刀具。以下以加工"等螺旋角等前角锥度立铣刀"为例,若要加工(含铣削及磨削)这种立铣刀,CNC机床应具备:X轴和A轴联动插补切削螺旋槽;Z轴:X-A插补时也参加插补保证每个截面螺旋角相等;Y轴:由于前角γ0>0且轴向每个截面半径都不相等从而使偏移量e也处处不相等,为保证每个截面前角都相等,X-A-Z联动时Y轴也要参加插补运动。因此CNC机床应具备"X-Y-Z-A"4轴联动的插补功能。

  同理可知:"X-Y-Z-A-B" 5轴联动插补可完成同上的球头立铣刀的加工。

  3、需要什么数控系统

  加工一般精度的可转位刀具,选择具有间隙补偿和螺距误差补偿的半闭环CNC系统的数控机床就可以满足要求,而对较高精度刀具(如整体材质的精加工刀具)的精加工可以选择闭环CNC系统。需要注意的是:为编程方便,CNC编程软件系统都应具有工件坐标系的平移和旋转功能,并支持几何线性的多种表达方式。

  现代CNC系统的编程方法较多,相对而言,以ISO标准G,M代码编程的CNC系统具有较大的灵活性,能满足多品种中小批量的生产要求,但初期编程速度较慢,机床准备工作时间较长。而具有针对某类刀具产品开发的专业化软件包的CNC系统则可以满足某些复杂刀具的大批量加工,生产效率高,对人员素质要求较低,但价格昂贵且需要不断升级软件包以满足出现的新产品。

  选择CNC系统时还应注意:现代CNC系统的功能较多,可以根据实际情况去掉一些基本不用或近期很少用到的功能(例如某些用于FMS的接口和软件)以降低购买成本。

  以上通过几个例子讨论了针对加工刀具产品的CNC机床选择方法和大概原则,实际情况远不止这些。总之应根据产品具体情况灵活地作出选择,以满足市场对精度和成本的双重要求。



H-Classical linear decorative knives

HA-CLASSICAL MOULDING BIT
HB-CLASSICAL MOULDING BIT WITHOUT BEARING
HB-Bilateral double R line knife
HC-CURVED LING BIT
HD-CLASSICAL BIT
HE-CLASSICAL BIT WITHOUT BEARING
HF-DOUBLE ROMAN BIT
HG-DOUBLE ROMAN BIT WITHOUT BEARING
HH-ROMAN OGEE BIT
HI-ROMAN OGEE BIT WITHOUT BEARING
HJ-CLASSICAL OGEE BIT
HK-CLASSICAL OGEE BIT
HL-WAVY EDGE BIT
HM-WAVY EDGE BIT WITHOUT BEARING
HN-CURVED ROUND WITH BEARING
HO-CLASSICAL BIT
HP-CLASSICAL BIT
HQ-Magic Knife
HR-Butterfly knife
HS-CLASSICAL MOULDING BIT
HT-CLASSICAL MOULDING BIT WITHOUT BEARING
HU-CLASSICAL MOULDING BIT
HV-CLASSICAL MOULDING BIT WITHOUT BEARING

I-Beaded Curve Knife

IA-DOUBLE BEADING BIT
IB-DOUBLE BEADING BIT
IC-DOUBLE BEADING BIT
ID-DRAGON BALL BIT
IE-A TYPE DRAWING LINE BIT
IF-DOUBLE DRAGON BALL BIT
IG-DRAGON BALL BIT

J-Crown curve decoration knives

JA-EDGE MOULDING BIT
JB-PALACE TYPE BIT
JC-CROWN MOULDING BIT
JD-CROWN MOULDING BIT
JE-CROWN MOULDING BIT
JF-CROWN MOULDING BIT

K-Architectural decorative knives streamlined

KA-DOUBLE ROUND NOSE BIT
KB-SPECIAL MOULDING BIT
KC-INTEREST MOULDING BIT
KD-FISH HANDRAIL BIT
KE-HANDRAIL BIT
KF-VARIABLE-BEADING BIT
KG-CROWN MOULDING BIT
KH-HANDRAIL BIT

L-Rail line/line Knife

LA-TABLE EDGE BIT
LB-TABLE OGEE BIT
LC-TABLE CORNER BIT
LD-HANDRAIL CLASSICAL BIT
LE-TABLE CURVED ROUND BIT
LF-TRADITIONAL BIT
LG-15Degree HORSE NOSE BIT
LH-ROMAN CLASSICAL BIT
LI-TRADITIONAL BIT
LJ-TABLE EDGE BIT

M-Combination of high handrail Knife Bottle

MA-HANDRAIL BIT
MB-HANDRAIL BIT
MC-HANDRAIL BIT

N-Polymorphic classical Knife

NA-VERTICAL BIT
NB-RAISED PANEL BIT
NC-PANEL BIT
ND-15 degrees plate type knife
NE-45 Degree PANEL BIT
NF-UNDERMOUNT BOWL BIT
NG-S-TYPE BIT

O-Knife nail-like model lines

OA-FINGER GRIP BIT
OB-DOUBLE FINGER BIT
OC-A TWO SLOPES FINGERNAIL BIT
OD-SIDE FINGER NAIL TYPE BIT
OE-ARCH TYPE ROUTER BIT
OF-ARCH TYPE ROUTER BIT
OG-FINGER NAIL BIT

P-T-tenon Knife

PA-DRAWER LOCK BIT
PB-T-TYPE SLOTTING CUTTER
PC-KEYHOLE BIT
PD-T-SLOT ROUTER BIT
PE-T-TYPE BIT WITH BEARING
PF-HINGE BIT
PG-JOINT BIT
PH-MITER BIT
PI-T-SLOT ROUTER BIT
PK-Long households knife

Q-T-tenon cutter combination of class

QA-BEAD & FLUTE BITS
QB-TONGUE & GROOVE BITS
QC-STYLE & RAIL ASSEMBLES
QD-STYLE & RAIL ASSEMBLES
QE-STYLE & RAIL ASSEMBLES
QF-STYLE & RAIL ASSEMBLES
QG-TONGUE & GROOVE BITS

R-Door Knife

RA-Tanaka knife
RB-Oblique arc knife
RC-Cascade knife
RD-Curved knife
RE-Feng cutter
RF-Qingping knife
RG-Type clever knife
RH-Thin round knife
RI-Liu knife edge
RJ-Kocho knife
RK-CLASSICAL PLUNGE BIT
RL-CLASSICAL PLUNGE BIT
RM-CLASSICAL PLUNGE BIT
RN-CLASSICAL PLUNGE BIT
RO-15Degree HORSE NOSE BIT
RP-10Degree HORSE NOSE BIT
RQ-OPEN-END CARVING BIT
RR-FLAT BOTTOM CUTTER

T-Solid Carbide cutting knives

TCT-SOLID CARBIDE STRAIGHT BIT

U-Other series

UA-Spindle machine flat knife, four planing knives
UB-Finger Joint Cutter Series
UC-Circular knife
UD-Speaker Knife
UE-A knife series
UF-Helical flat knife
UG-Small door knife (knife cabinet) series
UH-Ceiling moldings, edge line series
UI-Wallboard knife
UJ-Door Knife
Uk-Spiral Square Series
UL-Staircase handrail wire cutter series
UM-Frame Line Cutters
UN-Edge Knife
UO-Large door knife series
UP-Slot Knife
UQ-Flooring Knife
UR-Cabinet plate knife series
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