Automotive／Transmission
Transmission
For Finishing Valve Body Spool Holes / PCD Rotating Tool
For Finishing Valve Body Spool Holes / PCD Rotating Tool
Valve body spool hole finishing requires high machining accuracy in quality items such as surface roughness, roundness, cylindricity, and coaxiality, because the machined area has intersecting oil channels and multiple holes on the same coaxial line. We offer tool design proposals and advice tailored to your needs based on our various machining achievements and verifications. ・Cutting tool design for multi-step hole finishing realizes process integration. ・Precise and stable performance is brought out by diamond material characteristics and edge grinding technology. ・We offer suggestions to improve machining efficiency by tuning machining conditions. ■Features
Example of Valve Body Spool Hole Finishing
Specification
PCD Reamer
Carbide Reamer
Cutting Speed Vc (m/min) Feed Per Revolution f (mm/rev)
120
120
0.2 0.4
0.2 0.4
Stock Removal
(φ)
Coolant
JIS W1 Class Emulsion
JIS N2 Class Insoluble
Surface Roughness
Roundness
10
10
8
8
6
6
Improved by 2.7 Times
Improved by 2 Times
4
4
Shape
2
2
0
0
PCD Reamer
PCD Reamer
Carbide Reamer
Carbide Reamer
Proposal of High Efficiency Finishing by Unequal Layout Design 【Problem】 ・Cutting force and vibrations generated during the use of multi-blade rotating tools affect the quality of machining. 【Improvement Plan】 ・Unequally distributed cutting edges with opposite side edges prevent biting into the finished surface. ・Chatter can be suppressed and roundness and cylindricity can be improved by preventing the bite. ・The multi-blade design enables high feed rate and short machining time, resulting in high productivity.
Touring Example of PCD Rotating Tool for Finishing Valve Body Spool Hole
■Machining Examples
High roundness and coaxiality are achieved by 1-flute + multi-step as well as a cutting tool design that promotes constraint and chip evacuation. ■1-Flute 4-Step PCD Reamer
The preceding blade, which ensures coaxiality in the previous process, prevents misalignment and realizes high quality hole finishing even in high feed machining environments. ■4-Flute 4-Step PCD Reamer with Leading Edge
4-Flute Equalizer Arrangement
4-Flute Unequal Layout
1-Flute Balanced
Shape
This step drill is used for rough and medium finishing. Contributes to high quality hole finishing by stabilizing stock removal in the finishing process. ■2-Flute 4-Step PCD Step Drill
The unequal cutting edge design suppresses vibration during machining and improves roundness, cylindricity, and other qualities. ■5-Flute 3-Step Unequal Arrangement PCD Reamer
Stock Removal Rotational Speed
（mm/dia.）
0.4
0.4
0.4
（min -1 ）
6,600 5,300
4,000
4,000
Feed Rate
（mm/min）
400
960 0.24 0.06
Feed Per Revolution f (mm/rev)
0.8 0.2
0.1 0.1
Feed Per Tooth fz
(mm/z)
Coolant Chatter
Water-Soluble Oil Emulsion
None
None
Yes
Example of Additional Functions
Roundness
(µm) (sec)
2
3 2
4
Machining Time
0.15
0.8
■Roundness Comparison (Hole Finish Shape)
Enlarged Diagram
Enlarged Diagram
Enlarged Diagram
Exit side of hole is not strong enough, and the cutting force may cause issues such as chipping or ring shaped chips wrapped around the Workpiece along with chips. This is prevented by the cutting edge design that suppresses cutting resistance. ■Workpiece Chipping Prevention Function
Chip breaker prevents scratches on workpiece as well as equipment stoppage due to chips wrapped around holder. ■Chip Breaking Function
A single cutting edge with an ejection groove in the guide pad section to prevent build-up to the cutting edge, thereby preventing quality deterioration. ■Chip Evacuation Function
Roundness: 4-Flute Unequal Layout
※Note: Image is for illustration purposes.
Roundness: 4-Flute Equal Arrangement
015
016
Made with FlippingBook flipbook maker