Seria rozwiertaków GHI
Carbide reamer series for cast iron and steel with excellent finishing accuracy
Achieves high precision and high efficiency machining with „6 edges” + „unequal division”
Outstanding roundness by optimal unequal division
Excellent surface roughness by 6-edge processing
High efficiency machining with high feed rate
What is the GHI reamer series?
① GHI reamer
For general finishing holes
Features: High-precision machining by unequal division of 6 edges (straight flute)
- IT7 grade hole diameter accuracy
- Roundness 10 µm or less
- Surface roughness 12.5z
② GHI reamer Type T
For processing thin-walled workpieces
Features: Low resistance machining with right-hand helix (twist flute)
- IT7 grade hole diameter accuracy
- Roundness 10 µm or less
- Surface roughness 12.5z
③ GHI reamer Type R
For through-hole processing
Features: Improved through-hole chip evacuation with left-hand helix (twist flute)
- IT7 grade hole diameter accuracy
- Roundness 10 µm or less
- Surface roughness 12.5z
Amazing facts!
── Introducing ideas and technologies ──
The GHI series reamers for cast iron and steel achieve excellent roundness and surface roughness due to the optimised unequal division of the 6 cutting edges. Highly efficient machining at high feed rates contributes to shorter cycle times.
In addition to the standard version, the line-up includes Type T for thin-wall machining and Type R for through-hole machining.
Outstanding roundness
Good!
Conventional reamer
hole entry (mouth): 16 µm
hole bottom (depth): 18 µm
GHI reamer
hole entry (mouth): 4 µm
hole bottom (depth): 3 µm
(significantly better roundness)
Excellent surface roughness
Good!
Type T (right-hand helix)
Reduced cutting resistance
Good!
[Processing Conditions]
JIS FC250 / EN-GJL-250 / DIN GG50 / WNr 0.6025
ø10 mm, Vc = 100 m/min, f = 0.5 mm/rev
Type R (left-hand helix)
Improved chip evacuation
Good!
[Processing conditions]
JIS FCD450 / EN-GJS-450-10
ø8 mm, Vc = 100 m/min, f = 0.56 mm/rev
This is the point!
Improved machining accuracy by optimized 6-flute unequal division, cutting edge shape and coating
Excellent!
Unequal division at optimum angle for improved roughness.
Suitable for high feed rate:special specification with 6 edges + back taper for stable surface roughness at high feed rates
Development / product concept
“Current status and challenges”
- There was a need for finishing reamers capable of high-efficiency machining, but conventional multi-flute reamers were problematic because of their roundness and surface roughness sometimes deteriorated at high feed rates
“Development points”
- The GHI series has an optimised unequal division of the cutting edge, which significantly improves roundness. The number of cutting edges is set to six, with a back taper suitable for high feed rates, to achieve improved surface roughness.
Furthermore, the multi-layer coating contributes to lower tooling costs by extending tool life.
Processing example
Tools used
GHI Reamer
GHI Reamer Type T
GHI Reamer Type R
Machining work
Test piece
Work material
JIS FC250 / EN-GJL-250 /
DIN GG50 / WNr 0.6025
Tool diameter
ø10 mm
Cutting conditions
Feed: f = 0.5 mm/rev
Machining allowance
ø0.2 mm
Required accuracy
GHI Reamer, GHI Reamer Type T
Pilot hole ø9.5 mm
Reamed hole ø10 0/+0.015 mm
Roundness
Surface roughness
Product specification
- Tool specification
Tool name
GHI reamer
Target process
Grey cast iron (JIS FC / EN-GJL / DIN GG)
Spheroidal graphite or ductile cast iron (JIS FCD / EN-GJS / DIN GGG)
Steel hole finishing
Setting diameter
ø6 mm ~
Standard conditions
Feed: f = 0.2 ~ 0.6 mm/rev
Machining accuracy
Hole diameter: IT7 grade
- Tool specification
Tool name
GHI reamer type T
Target process
Grey cast iron (JIS FC / EN-GJL / DIN GG)
Spheroidal graphite or ductile cast iron (JIS FCD / EN-GJS / DIN GGG)
Steel hole finishing
Setting diameter
ø6 ~ ø20 mm
Standard conditions
Feed: f = 0.2~0.6 mm/rev
Machining accuracy
Hole diameter: IT7 grade
- Tool specification
Tool name
GHI Reamer type R
(for through holes only)
Target process
Grey cast iron (JIS FC / EN-GJL / DIN GG)
Spheroidal graphite or ductile cast iron (JIS FCD / EN-GJS / DIN GGG)
Steel hole finishing
Setting diameter
ø6 ~ ø20 mm
Standard conditions
Feed: f = 0.2~0.6 mm/rev
Machining accuracy
Hole diameter: IT7 grade
- Example of applicable work
Differential case
Connecting rod