Tilted Cutting Tool Geometry for Low-Vibration Hole Machining
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Solution Overview
Problem
Machining curved or thin holes in workpieces often results in tool vibration due to increased machining speed or depth, making efficient machining difficult.
Innovation Solution
A cutting tool and method where the tool moves inward from the aperture of the hole at a tilt angle of 120 to 240°, converting half of the cutting force into the central axis direction, reducing radial cutting force and vibration by using a tool with a shaft-shaped body and radially protruding blade parts with specific cutting edge angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a thin tool is used to machine curved or thin holes, then the tool can access the hole, but the tool vibrates when increasing machining speed or depth
Solution Approach 1:
The patent changes the geometric parameters of the cutting edge by forming a specific contour angle (30° to 150°) relative to the central axis. This parameter change redirects the cutting force vector, converting more force into the axial direction and reducing radial cutting force, thereby suppressing tool vibration while maintaining thin tool dimensions for accessing curved holes
2Productivity
If machining speed or depth is increased to improve efficiency, then productivity increases, but tool vibration occurs
Solution Approach 1:
By modifying the cutting edge contour angle parameter, the patent fundamentally changes the force distribution during machining. This allows increased machining speed and depth without triggering vibration, as the redirected cutting force maintains tool stability even under higher load conditions
3Reliability
If the cutting force in radial direction is reduced, then tool vibration decreases, but cutting efficiency may be affected
Solution Approach 1:
The patent optimizes the contour angle parameter to achieve a balanced force distribution. By setting the angle between 30° and 150°, the cutting force is redirected to convert at least half into axial direction, reducing radial force and vibration while maintaining sufficient cutting efficiency through proper force vector orientation
Data Source
AI summary
A tool (T) is provided with: a shaft-like tool body (11) having a first end portion (11a) extending along a central axis line (Ot) and attached to a main shaft, and a second end portion (11b) on an opposite side to the first end portion (11a); and a fore end portion (12) connected to the second end portion (11b) of the shaft-like tool body (11). The fore-end portion (12) includes a central portion (13) including a fore-end face (17) of the tool (T), and a plurality of blade portions (14) protruding radially outward from the central portion (13). A cutting blade of each blade portion (14) includes a main cutting blade (15) adjacent to the fore-end face (17). The main cutting blade (15) includes an outline that forms an angle of 30-150 degrees with respect to the central axis line (Ot) in a cross-sectional view including the central axis line (Ot).