Three-Tip Indexable Drilling Insert for Protected Cutting Edges
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing indexable cutting inserts for drilling operations lack a high cutting extent relative to their size/volume and do not provide stable, secure, and protected non-operative cutting edges.
Innovation Solution
An indexable drilling insert with a central portion and three tip portions, each with two diverging cutting edges, is designed to maximize cutting extent and protection, featuring a central axis with three circumferentially spaced tip portions and a rotary cutting tool with insert pockets for secure mounting, ensuring efficient use of cemented carbide and protecting non-operative edges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional indexable cutting inserts are used for drilling operations, then the insert structure is simple, but the cutting extent relative to size/volume is low
Solution Approach 1:
The cutting insert is divided into a central portion and three tip portions, each tip portion having two diverging cutting edges. This segmentation allows the insert to achieve high cutting extent relative to its size by distributing cutting edges across multiple segmented regions, maximizing the utilization of cemented carbide material.
2Ease of operation
If conventional drilling inserts are used, then the insert is easy to mount, but non-operative cutting edges are not protected from damage
Solution Approach 1:
The cutting insert is centrally mounted within the rotary cutting tool, with the central portion nested in the tool center and tip portions extending outward. This nesting arrangement protects non-operative cutting edges by positioning them inside the tool structure where they are shielded from external damage during storage and transport.
3Productivity
If a drilling insert with three tip portions is designed to maximize cutting extent, then cutting efficiency improves, but secure mounting becomes more difficult
Solution Approach 1:
The cutting insert features an asymmetric configuration with a central portion and three tip portions circumferentially spaced about it. The central portion has opposing side surfaces that interface with the tool body, creating an asymmetric mounting interface that ensures stable, secure positioning despite the complex multi-tip geometry.
Data Source
AI summary
A drilling insert has a central portion with a central axis, and three circumferentially spaced tip portions. Each tip portion has a first axis and two diverging first cutting edges with radially outermost cutting points defining a first circle lying on a tip plane perpendicular to the first axis and having a first cutting diameter. In a view along one of the first axes, a second circle having a second diameter circumscribes the drilling insert, and the first cutting diameter is at least sixty percent of the second diameter. A cutting tool rotatable about a tool axis with a tool cutting diameter includes the drilling insert, and a second cutting insert having a second cutting edge. One of the tip portions is operative having its first axis coaxial to the tool axis, and the second cutting edge extends radially outward of the first cutting diameter.