Ball Track Milling Head Geometry for Even Wear and Low Vibration
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Solution Overview
Problem
Existing milling heads for ball track milling cutters have a limited service life due to uneven wear distribution along the cutting edge, leading to premature wear at the second cutting edge end and increased vibrations during processing.
Innovation Solution
The milling head is designed with a varying negative rake angle and free angle along the cutting edge, with different values at the first and second cutting edge ends, while maintaining a constant wedge angle. This adaptive geometry reduces wear and vibrations by optimizing the cutting edge geometry to match current processing conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a constant rake angle and clearance angle are used along the cutting edge, then the manufacturing process is simple, but the wear is uneven and service life is limited
Solution Approach 1:
The patent applies local quality by varying the rake angle and clearance angle at different locations along the cutting edge. Specifically, the rake angle changes from a first value at the first cutting edge end to a second value at the second cutting edge end, and similarly for the clearance angle. This localized variation optimizes wear distribution across different regions of the cutting edge, thereby extending service life while maintaining manufacturability through controlled gradient design.
Solution Approach 2:
The patent implements parameter changes by systematically varying the rake angle and clearance angle along the cutting edge profile. The rake angle transitions from an initial value to a final value, and the clearance angle transitions from an initial value to a final value, creating optimized cutting geometry at different positions. This parameter variation ensures more uniform wear distribution and extended tool life.
2Duration of action of moving object
If a varying rake angle and clearance angle are used along the cutting edge, then service life is extended through even wear distribution, but the manufacturing complexity increases
Solution Approach 1:
The patent applies dynamics by introducing a gradient variation in the rake angle and clearance angle along the cutting edge rather than using static constant values. The angles change progressively from one end to the other, creating a dynamic geometric profile that adapts to different cutting conditions at different positions, thereby extending service life through more uniform wear distribution.
Solution Approach 2:
The patent implements parameter changes by systematically varying the rake angle and clearance angle along the cutting edge profile. The rake angle transitions from an initial value to a final value, and the clearance angle transitions from an initial value to a final value, creating optimized cutting geometry at different positions. This parameter variation ensures more uniform wear distribution and extended tool life.
3Reliability
If the cutting edge geometry is optimized for one region, then that region performs well, but other regions experience excessive wear and chipping
Solution Approach 1:
The patent applies local quality by varying the rake angle and clearance angle at different locations along the cutting edge. Specifically, the rake angle changes from a first value at the first cutting edge end to a second value at the second cutting edge end, and similarly for the clearance angle. This localized variation optimizes wear distribution across different regions of the cutting edge, thereby extending service life while maintaining manufacturability through controlled gradient design.
Solution Approach 2:
The patent implements parameter changes by systematically varying the rake angle and clearance angle along the cutting edge profile. The rake angle transitions from an initial value to a final value, and the clearance angle transitions from an initial value to a final value, creating optimized cutting geometry at different positions. This parameter variation ensures more uniform wear distribution and extended tool life.
4Ease of manufacture
If a standard cutting edge geometry is used, then manufacturing is straightforward, but vibrations occur during machining due to poor adaptation to instantaneous engagement conditions
Solution Approach 1:
The patent applies local quality by varying the rake angle and clearance angle at different locations along the cutting edge. Specifically, the rake angle changes from a first value at the first cutting edge end to a second value at the second cutting edge end, and similarly for the clearance angle. This localized variation optimizes wear distribution across different regions of the cutting edge, thereby extending service life while maintaining manufacturability through controlled gradient design.
Solution Approach 2:
The patent implements parameter changes by systematically varying the rake angle and clearance angle along the cutting edge profile. The rake angle transitions from an initial value to a final value, and the clearance angle transitions from an initial value to a final value, creating optimized cutting geometry at different positions. This parameter variation ensures more uniform wear distribution and extended tool life.
Data Source
Figure 1
Figure 2~3
AI summary
The invention relates to a milling head (1) for a ball track milling cutter (3), comprising a notional central axis (M), a first working-side end (5) and a second clamping-side end (7) opposite the first end (5) when viewed along the central axis (M), and comprising at least one geometrically defined cutting edge (9) which extends along a cutting edge course of the cutting edge (9) from a first cutting edge end (11) facing the first end (5) of the milling head (1), in the direction of the second end (7) of the milling head (1), up to a second cutting edge end (13) facing the second end (7) of the milling head (1), wherein the at least one cutting edge (9) is designed as an intersecting line between a rake face (15) associated with the at least one cutting edge (9) and a first flank face (17) associated with the at least one cutting edge (9), wherein the at least one cutting edge (9) is assigned a negative rake angle (a), a first flank angle (ß) and a wedge angle (γ). According to the invention: the negative rake angle (a) has a different value in the region of the first cutting edge end (11) than in the region of the second cutting edge end (13); the first flank angle (ß) has a different value in the region of the first cutting edge end (11) than in the region of the second cutting edge end (13); and the wedge angle (γ) is constant along the course of the cutting edge.