Coated Cutting Insert Chamfer Geometry for Wear and Sharpness
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Solution Overview
Problem
Existing cutting inserts with coating layers face challenges in wear resistance and sharpness maintenance due to inadequate chamfer angles and widths, leading to premature wear and chipping during machining processes.
Innovation Solution
A cutting insert design featuring a C chamfered surface with a chamfer angle of 35° to 50° and a width of 5 μm to 30 μm, along with a nose portion between the front and side cutting edges, promotes the formation of a protective welded object that reduces wear and enhances sharpness by optimizing the contact angle and surface roughness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the chamfer angle is increased to improve wear resistance, then the coating layer wear resistance is improved, but the cutting edge sharpness deteriorates
Solution Approach 1:
The patent optimizes the chamfer angle parameter to a specific range of 35° to 50° and the C chamfered surface width to 5 μm to 30 μm. This parameter optimization resolves the contradiction by finding the optimal balance point where the chamfer angle is sufficient to protect the coating layer from wear while maintaining the cutting edge sharpness necessary for precise machining.
2Duration of action of stationary object
If the chamfer width is increased to improve durability, then the cutting insert durability is improved, but the cutting resistance increases
Solution Approach 1:
The patent specifies the C chamfered surface width parameter within the range of 5 μm to 30 μm. This optimized width provides sufficient durability protection for the cutting insert while limiting the increase in cutting resistance, thereby resolving the contradiction between durability and cutting resistance.
3Manufacturing precision
If the chamfer angle is decreased to maintain sharpness, then the cutting edge sharpness is improved, but the wear resistance deteriorates
Solution Approach 1:
The patent establishes the optimal chamfer angle range of 35° to 50° through parameter optimization. Within this range, the cutting edge maintains sufficient sharpness for precise machining while the coating layer receives adequate protection against wear, thus resolving the contradiction between sharpness and wear resistance.
4Reliability
If the C chamfered surface width is increased to reduce chipping, then the chipping resistance is improved, but the manufacturing precision deteriorates
Solution Approach 1:
The patent optimizes the C chamfered surface width to 5 μm to 30 μm. This optimized width provides sufficient protection against chipping while maintaining the manufacturing precision and surface finish quality, thereby resolving the contradiction between chipping resistance and surface finish quality.
Data Source
AI summary
In an embodiment, a cutting insert including a base member, a first face, a second face, a cutting edge, and a nose portion. The base member includes a coating layer on at least a part thereof. The first face has corner portions. The second face is adjacent to the first face. The cutting edge is on at least a part of the ridgeline portion of the first face and the second face, and includes first and second cutting edges. The first cutting edge is on the coating layer and has a C chamfered surface with a first width of 5 μm to 30 μm in the front view of the first face and a chamfer angle of 35° to 50°. The nose portion is at the corner portions between the first cutting edge and the second cutting edge.