Indexable Drill Insert Multi-Edge Design for Versatile Cutting
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Solution Overview
Problem
Existing indexable drills face challenges with cutting inserts that require multiple types for internal and external cutting functions, leading to increased cutting loads and surface roughness due to unfavorable inclination angles and complexity in handling.
Innovation Solution
A cutting insert design with reference surfaces, internal, and external side surfaces featuring specific angles and widths, allowing for both internal and external cutting functions with optimized inclination angles, reducing cutting loads and improving surface roughness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple types of cutting inserts are used for internal and external cutting functions, then cutting functionality is improved, but device complexity and handling difficulty increase
Solution Approach 1:
The cutting insert is designed with multiple cutting edges (first and second internal cutting edges for internal cutting, first and second external cutting edges for external cutting) that can all be utilized by rotating the insert. This allows a single insert type to perform both internal and external cutting functions, eliminating the need for multiple specialized insert types and simplifying inventory and handling.
Solution Approach 2:
The cutting insert incorporates rotational capability, allowing the operator to rotate the insert to different orientations to access different cutting edges. This dynamic repositioning enables the same physical insert to adapt between internal and external cutting modes, providing versatility without requiring multiple static insert designs.
2Device complexity
If a greatly applied minus inclination angle in radial direction is used, then cutting insert structure is simplified, but cutting load increases and surface roughness degrades
Solution Approach 1:
The patent optimizes the inclination angle parameter in the radial direction, transitioning from a greatly applied minus angle to a controlled plus angle range (0° to +15°). This parameter change reduces cutting load and improves surface roughness while maintaining structural simplicity through the integrated multi-edge design.
3Device complexity
If a greatly applied minus inclination angle in radial direction is used, then cutting insert structure is simplified, but surface roughness degrades
Solution Approach 1:
The inclination angle in the radial direction is optimized to a plus angle within 0° to +15°, which significantly improves surface roughness compared to the conventional greatly applied minus angle. This parameter optimization achieves better machining quality while the integrated multi-edge structure maintains simplicity.
Data Source
AI summary
A cutting insert for an indexable drill according to the present disclosure may be used for external cutting or internal cutting depending on a position and a direction in which the cutting insert is installed even though a single type of cutting insert is provided. In addition, the cutting insert for an indexable drill according to the present disclosure has a section of the internal cutting edge which is involved in a cutting process or a section of the internal cutting edge which is not involved in the cutting process, which are clearly distinguished from each other, and as a result, the cutting insert may be rotated and mounted, and reversed and mounted on a drill body, such that maximum eight corners may be used to perform a cutting process.