Textured CBN Cutting Edge Structure for Lower Cutting Resistance
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Solution Overview
Problem
Conventional cutting tools experience high cutting resistance, which is not sufficiently reduced, limiting their efficiency in cutting processes.
Innovation Solution
A cutting tool with a cutting edge portion made of cubic boron nitride or polycrystalline diamond, featuring a flank face and negative land with recesses and projections formed by adjacent edges in contact, reducing cutting resistance and improving cooling effects through fluid entry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If conventional cutting tool surfaces are used without texture, then the structure is simple and easy to manufacture, but cutting resistance is high and cooling effect is insufficient
Solution Approach 1:
The cutting tool surface is segmented into multiple recesses and projections instead of being flat, creating a textured structure that reduces cutting resistance while maintaining manufacturability through controlled surface modification
Solution Approach 2:
The surface texture is applied locally to specific regions of the cutting tool (rake face and/or flank face) rather than uniformly across the entire tool, allowing targeted improvement of cutting performance where needed while preserving overall structural simplicity
2Temperature
If conventional flat surfaces are used on the cutting tool, then manufacturing is simple, but cooling effect by cutting fluid is insufficient
Solution Approach 1:
The cutting tool surface is modified to have a porous-like textured structure with recesses that can trap and channel cutting fluid, enhancing cooling effect while using conventional laser processing techniques that are already established in manufacturing
Solution Approach 2:
The complex mechanical process of creating surface textures through conventional machining is replaced with laser processing, which can create the same textured structure more simply and with greater precision
3Productivity
If recesses are provided on the cutting tool surface, then chip breakability is improved, but projections may fracture during cutting
Solution Approach 1:
The dimensions, depth, and distribution parameters of the recesses and projections are optimized to achieve the right balance between chip breakability and fracture resistance, ensuring projections are sufficiently robust while still enabling effective chip control
Solution Approach 2:
The projection structure is designed with adequate size and structural integrity to withstand cutting forces before chip breaking occurs, providing a cushioning effect that prevents premature fracture while enabling subsequent chip breakage function
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The tool achieves reduced cutting resistance, enhanced cooling, and improved chip breakability, while preventing projection fracture and chip adhesion, even during small cuts.
Implementation Method 1
a method for manufacturing a cutting tool includes a step of irradiating at least one of the negative land and the flank face with laser so as to form a plurality of recesses on a surface irradiated with laser
Data Source
Figure 1
Figure 2A~2B
Figure 3~4
AI summary
A cutting tool according to an aspect of the present disclosure includes a cutting edge portion which contains at least one of cubic boron nitride and polycrystalline diamond. The cutting edge portion includes a flank face, a negative land contiguous to the flank face, and a cutting edge formed by a ridgeline between the flank face and the negative land. At least one of the negative land and the flank face is provided with a plurality of recesses and a projection. The projection is formed by arranging the edges of adjacent recesses in contact with each other.