Double-Sided Drilling Insert With Asymmetric Chip Grooves
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Solution Overview
Problem
Double-sided cutting inserts face limitations in drilling performance due to varying cutting speeds along the cutting edge in radial direction, leading to increased wear and inefficiencies in rotary machining applications.
Innovation Solution
The double-sided cutting insert features distinct external profiles and chip groove geometries on both top and bottom faces, with eight indexable cutting edges, allowing for different carbide grades and optimized cutting geometries to address the wear issues and improve machining performance by adapting to varying cutting speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If identical cutting geometry is used on both top and bottom faces to support inscribed circle, then manufacturing simplicity is maintained, but machining performance deteriorates due to varying cutting speeds in drilling operations
Solution Approach 1:
The patent applies different cutting geometries to different regions of the insert. The top face has a first cutting geometry optimized for stationary machining, while the bottom face has a second cutting geometry optimized for rotary drilling operations. This local differentiation allows each face to perform optimally in its specific application context, resolving the contradiction between manufacturing simplicity and machining performance.
Solution Approach 2:
The patent introduces asymmetry by using non-identical cutting geometries on the top and bottom faces of the insert. The first cutting geometry on the top face differs from the second cutting geometry on the bottom face, allowing optimization for different machining modes (stationary vs. rotary) while maintaining the same inscribed circle diameter for manufacturing consistency.
2Productivity
If double-sided cutting insert is used to double the number of cutting edges, then cost reduction is achieved, but cutting performance deteriorates due to inability to optimize for varying cutting speeds in drilling
Solution Approach 1:
The patent optimizes different regions of the double-sided insert for different functions. The top face cutting geometry is optimized for stationary machining applications, while the bottom face cutting geometry is optimized for rotary drilling with varying cutting speeds. This regional optimization maintains cost benefits of double-sided inserts while improving cutting performance in each specific application.
Solution Approach 2:
The patent introduces dynamic adaptability by providing different cutting geometries that can be selected based on the specific machining operation. The operator can choose the appropriate face (top or bottom) based on whether stationary or rotary machining is being performed, allowing the insert to adapt to different cutting speed conditions and maintain optimal performance.
3Productivity
If positive cutting geometry is used to reduce cutting forces and power consumption, then machining efficiency is improved, but insert strength deteriorates compared to square-shaped inserts
Solution Approach 1:
The patent optimizes the cutting geometry parameters (rake angles, clearance angles, edge orientations) to achieve positive cutting action that reduces cutting forces and power consumption. By carefully selecting and optimizing these geometric parameters for each face, the insert achieves improved machining efficiency while maintaining sufficient strength through proper geometry design rather than relying solely on square shape.
Data Source
Figure 1A~1B
Figure 2A~2E
Figure 3A~3E
AI summary
A double-sided cutting insert (10) for a drilling tool includes a top side (11), a bottom side (12), and at least one side surface interconnecting the top side (11) and the bottom side (12) and forming at least one cutting edge (13a, 13b, 13c, 13d, 14a, 14b, 14c, 14d). The top side and the bottom side comprise a different external profile and chip groove (17,19) geometry and an identical inscribed circle (33), and each of the top side (11) and the bottom side (12) comprises four indexable cutting edges (13a, 13b, 13c, 13d, 14a, 14b, 14c, 14d).