Drill bits
Representative top cutting-edge form
Profile


Taper cutting edge


Plane dual cutting edge


Candle cutting edge

Features
Major flank is taper surface, if it is closer to the Core bit,
Normal profile, soft material and high hard materials can
Plane grinding major flank's drill bit, easy for grinding, and with good grip performance
Commonly used for small-diameter drill bit
Double apex angle's drill bits, with good centrality, and less burrs when drill through
It is the drill bit to process thin boards and profiles.
Chisel edge grinding
The closer, the rake angle of drill bit's cutting-edge to the drill bit, the smaller, the center part, and it is negative rake angle at chisel edge part. When cutting, the center
part extrudes the materials, and the cutting resistance produced account for 50%-70%, but chisel edge grinding is very efficient in lowering the drill bit's cutting
resistance, discharging the cutting produced at chisel edge part and improving cut-in performance.
Profile

Type X

Type XR

Type S

Type N

Features Axial load is greatly reduced, cut-in
performance is improved, and efficient
when the core bit diameter is large
Cut-in is not as good as that of Type X, but cutting edge strength is high,work piece
material is widely applicable,andlifetime is long
General machining of steel,
casting steel and non-ferrous metal
Efficient when the diameter
of bit core is larger
Main application General machining, machiningof deep hole General machining of stainless steel General machining of steel,
casting steel and non-ferrous metal
Machining of deep hole
Chips when drill bit is processed
 
Cutting type Profile restrained by processed
1. Taper helical
The fan chip from cutting edge is formed via chip flute ,when machining ductile materials at low feed,
and will break when there are many rolls, so chip discharge is good
2. Long gear
Formed chips don't crimp, and are discharged as is and easy to entwine drill bit when discharging
3 Fan
Chips are controlled by chip flute and processed hole-wall, formed at high feed, and chip disposal is good.
4. Over breaking
Taper helical chips are restrained by processed hold wall. Before growing into long way of mesh,
chips are broken and discharged smoothly because of insufficient material plastics,
so chip disposal is good
5. Z-profile
Formed chips are squeezed, folded due to profile of chip flute, material characteristics etc,
and easily lead to jamming inside the flute
6. Needle
Brittle materials or small rolls of chips are formed by vibration breaking,
chips are discharged smoothly, but sometimes they are jammed inside the flute