Indexable Cutting Insert with Variable Rake Angles
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Solution Overview
Problem
Existing rotating cutting tools face issues with vibration or chatter during metal cutting processes, leading to accelerated tool wear, reduced surface finish, and potential spindle damage, which are difficult to mitigate without adjusting operating parameters, thereby reducing productivity and efficiency.
Innovation Solution
The indexable cutting insert features multiple geometrical configurations, allowing for varying axial and radial rake angles by indexing within the same pocket, enabling multiple cutting edge and rake surface profiles, which can be adjusted to reduce vibration and chatter while maintaining optimized operating parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If operating parameters (cutting depth, cutting speed, feed rate) are adjusted to eliminate vibration or chatter, then tool wear and surface finish are improved, but productivity and efficiency are reduced
Solution Approach 1:
The invention changes the geometrical parameters of the cutting insert (rake angles, clearance angles, edge orientations) rather than adjusting operating parameters. By providing multiple pre-configured cutting edge geometries on a single insert, the system can switch between different rake angle configurations to eliminate chatter while maintaining optimal cutting depth, speed, and feed rate, thus preserving productivity.
Solution Approach 2:
The invention introduces dynamic adaptability by allowing the cutting insert to be indexed between multiple predetermined positions, each presenting a different rake angle configuration. This dynamic reconfiguration capability enables real-time adaptation to varying cutting conditions without requiring changes to operating parameters, resolving the contradiction between reliability and productivity.
2Device complexity
If a single geometrical configuration is used for cutting inserts, then device complexity is reduced, but the ability to reduce vibration and chatter is limited
Solution Approach 1:
The invention makes a single cutting insert multi-functional by incorporating multiple cutting edges with different rake angle configurations on the same insert body. This universal design allows the insert to perform multiple cutting functions by indexing to different positions, eliminating the need for multiple specialized inserts while enhancing vibration reduction capability.
Solution Approach 2:
The invention merges multiple cutting edge geometries into a single insert body, combining different rake angle configurations (e.g., positive, zero, and negative rake angles) on one component. This consolidation reduces the number of replaceable parts while providing the flexibility to select appropriate geometries for different cutting conditions, thereby reducing chatter without increasing overall system complexity.
3Adaptability or versatility
If multiple cutting edges with different rake angles are provided on the same insert, then adaptability to reduce chatter is improved, but insert design complexity increases
Solution Approach 1:
The invention segments the insert body into distinct cutting edge zones, each with predetermined rake angle configurations. By dividing the insert into separable functional segments (different cutting edges) that can be independently activated through indexing, the design achieves high adaptability while maintaining a modular structure that limits overall complexity.
Data Source
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AI summary
An indexable cutting insert (20) and a milling cutter (58; fig.5) with identical indexable cutting inserts (20). The indexable cutting insert (20) has an upper surface (22), opposing lower surface (24), and a peripheral side surface (26). Major cutting edges(46,48) are formed on an upper peripheral edge(28), with adjacent major rake surfaces (54, 56) on the upper surface (22). At least two of the major cutting edges (46,48) have different insert axial rake angles (Al, A2) at equivalent index points(E,F) along the major cutting edges (46, 48), and at least two of the major rake surfaces (54, 56) have different rake surface profile angles (Bl, B2) at planar sections (P4,P5)which are perpendicular to the major cutting edges (46, 48) and contain an insert axis (A, B). The milling cutter (58) has a milling cutter body (62) with a plurality of identical insert receiving pockets (60), where an equal number of the identical indexable cutting inserts (20) are removably seated, having active major cutting edges (46,48) and active major rake surfaces (54, 56) with different axial and/or radial rake angles.