Result Less feed force.小的进给抗力 Stabilizing the main cutting edge.让主切削刃更稳定 Stabilizing the corner. Less wear on the corner.让钻头的两个角更强壮，减少磨损 Optimized chipcontrol and improved cutting geometry. Optimized chipcontrol and improved cutting geometry. Less feed force.
D3-0031-0008-E-p
Precision Cutting Tools
Steel grades.
Structural steels
Structural steel grades
Rm < 690 N/mm2 (100,000 psi) and lower than 0.05% P and S
Outer corner
D3-0011-0008-E-p
Precision Cutting Tools
Clearance angle.后角
a
a = clearance
angle
D3-0012-0008-E-p
Precision Cutting Tools
Drill points.钻尖
Style A and C B D E U
90° ... 130° d2 = d1 + 0,5...1 d1
D3-0029-0008-E-p
Precision Cutting Tools
Axial forces.轴向力
60 - 70% 30 - 40%
D3-0030-0008-E-p
Precision Cutting Tools
The influence of tip-angle on the cutting forces. 钻尖角度对切削力的影响。
D3-0020-0008-E-p
整体硬质合金钻头刃口结构
Precision Cutting Tools
D3-0021-0008-E-p
Precision Cutting Tools
Basic drill types.基本钻头形式
Typ N
general Purpose 通用型
Typ H
brittle Materials 短削材料
Soft Materials 软材料
90°
118°
130°
140° Hard
Materials 硬材料
B
Small tip-angles: drill's tip enters first and provides guidance.
a a
A A B
Large tip-angles: cutting force A enters the drill axially. Side-slip is reduced.
Typ W
soft Materials 软材料
D3-0023-0008-E-p
Precision Cutting Tools
Profile of a twist drill.
Profiles of the types N and UFL
web
A
B
section A - B
Type N
Type UFL
heavy normal
small
D3-009-0008-E-p
Precision Cutting Tools
Different drill shanks.不同的钻头柄部模式
Plain cylindrical 圆柱柄
Morse taper莫式柄
Standard shank标准柄
D3-0010s.
Feed 进给
Rotation 旋转
D3-004-0008-E-p
Precision Cutting Tools
Components of resultant force action on cutting edge of drill
B4_007_E.ppt
D3-005-0008-E-p
Precision Cutting Tools
Shank柄部
Tool material刀具材料
Flute排削槽
Tip 钻尖
D3-006-0008-E-p
Precision Cutting Tools
Chip formation 铁削形成
Sources: Sandvik Coromant
B4_001_E.ppt
Constructional steels
Unalloyed constructional steels
D3-007-0008-E-p
Precision Cutting Tools
Back taper.
d
100
d – 0.02 ... 0.08
D3-008-0008-E-p
Precision Cutting Tools
Web taper.
d
100
d + 1 - 2 mm
1 : 50 1 : 50 1 : 80 1: 100
D3-0024-0008-E-p
Precision Cutting Tools
Flute geometry.排削槽型
High rigidity
Large Chipspace 大的排削空间
D3-0025-0008-E-p
Precision Cutting Tools
Step drill for machining with minimum burr formation.
Precision Cutting Tools
Land
Body clearance diameter
Web or core thickness
Heel Depth of body clearance
Chisel edge Diameter直径 Main cutting Edge主切削刃
Chisel edge angle
Precision Cutting Tools
BASIC NOMECLATURE ROTATING TOOLS. Training for Salesengineer
DRILLING 钻头 TAPPING 丝锥 MILLING 铣刀
D3-001-0008-E-p
Harald Preusser
Precision Cutting Tools