Cutting Insert with Arcuate Edges for Ball-End Mill
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Solution Overview
Problem
Existing indexable ball-end mills require separate cutting inserts for outer peripheral and central cutting edges, leading to control challenges and increased machining costs due to the need for multiple types of inserts.
Innovation Solution
A single type of cutting insert with specific arcuate cutting edges and intersecting ridge lines is designed to function as both outer peripheral and central cutting edges, mounted on a tool body, allowing for three cutting edges in a three-blade configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate cutting inserts are used for outer peripheral and central cutting edges, then cutting performance is improved, but device complexity and control difficulty increase
Solution Approach 1:
The cutting insert is designed with multiple arcuate cutting edges (first, second, and third arcuate cutting edges) that can all function as either outer peripheral cutting edges or central cutting edges depending on mounting orientation. This universal design allows a single insert type to replace multiple specialized insert types, resolving the contradiction by maintaining cutting performance while reducing control complexity.
2Adaptability or versatility
If multiple types of cutting inserts are used for different cutting edges, then cutting functionality is improved, but the number of inserts needed increases and cost increases
Solution Approach 1:
The cutting insert features multiple arcuate cutting edges with different radial distances from the centerline, allowing a single insert type to provide both outer peripheral and central cutting functionality. This eliminates the need to stock multiple insert types and reduces the total number of inserts required, resolving the contradiction between versatility and quantity.
Solution Approach 2:
Multiple cutting edges with different functions (outer peripheral and central) are merged into a single cutting insert body. The insert includes first, second, and third arcuate cutting edges that can be configured to provide both outer peripheral and central cutting capabilities, combining what were previously separate components into one unified solution.
3Productivity
If three cutting edges are implemented in a ball-end mill, then machining efficiency is improved, but the complexity of managing cutting inserts increases
Solution Approach 1:
The cutting insert is designed with three arcuate cutting edges that can all serve as either outer peripheral or central cutting edges depending on how the insert is mounted. This allows the ball-end mill to have three cutting edges for improved productivity while using only one type of insert, eliminating the management complexity that would arise from using multiple insert types.
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
Intersecting ridge lines of the top surface (2) and side surfaces (4a, 4b) of a cutting insert (1) have opposing first and second arcuate cutting edges (8, 10). One intersecting ridge line of the bottom surface (3) and side surface (4a) has a third arcuate cutting edge (9). The first and third cutting edges are on one side and the second cutting edge is on the other side with respect to the middle line. The length between the first and second cutting edges is greater than the length between the third cutting edge and the other intersecting ridge line (11). In a cross section perpendicular to the middle line, the angle formed by the top surface and a line connecting the first and third cutting edges is different from the angle formed by the top surface and a line connecting the second cutting edge and the ridge line (11).