Trigon Cutting Insert with Rounded Minor Edges
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing cutting inserts often result in insufficient surface quality with bumps during machining operations due to higher feed speeds, particularly in surface milling cutters, where the machined surface exhibits circular arcs and poor finish.
Innovation Solution
A double-sided trigon cutting insert with three major cutting edges and three minor cutting edges, featuring planar peripheral side surfaces and a cutting tool with specific insert-receiving pockets for secure mounting, where the minor cutting edges are designed with a rounded rake surface and a radius to ensure only the high point contacts the workpiece, improving surface finish.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If higher feed speeds are used in surface milling operations, then productivity increases, but surface quality deteriorates with bumps and circular arcs
Solution Approach 1:
The cutting insert applies local quality by providing different surface characteristics at different locations: the major cutting edges have planar rake surfaces for roughing operations, while the minor cutting edges have rounded rake surfaces for finishing operations. This allows the tool to maintain high productivity while achieving good surface quality at the critical finishing contact points.
Solution Approach 2:
The cutting insert is segmented into distinct functional zones with three major cutting edges for roughing and three minor cutting edges for finishing. Each edge type is optimized independently, allowing the tool to perform multiple functions simultaneously and resolve the contradiction between productivity and surface quality.
2Adaptability or versatility
If multiple cutting edges are arranged at different levels on the cutting insert, then both roughing and finishing functions are achieved, but the surface topography becomes very complex
Solution Approach 1:
The cutting insert uses asymmetric geometry with three major cutting edges and three minor cutting edges arranged in a trigon configuration. The minor cutting edges are positioned and shaped differently from the major edges, creating the necessary asymmetry to achieve both roughing and finishing functions while maintaining a manageable topography through systematic arrangement.
Solution Approach 2:
The cutting insert arrangement transitions from traditional two-dimensional edge placement to a three-dimensional configuration where cutting edges are distributed across multiple levels and angles. This dimensional approach allows simultaneous roughing and finishing capabilities while organizing the complexity in a systematic manner that reduces overall topographical complexity.
Data Source
AI summary
A double-sided, trigon cutting insert has three three major cutting edges formed at an intersection between a first planar side surface portion and first and second surfaces, and three minor cutting edges formed at an intersection between a second planar side surface portion and first and second surfaces. A planar rake surface extends radially inward and downward from each major cutting edge, and a rounded rake surface extends radially inward and downward from each minor cutting edge. An insert-receiving pocket of a cutting tool includes a planar bottom support surface, a first planar side support surface, a second planar side support surface, and a third planar side support surface. Each rounded rake surface is formed with a radius, R, that causes only a high point of each minor cutting edge to contact a workpiece during a machining operation.