Indexable Turning Insert Geometry for Longer Cutting Edge Life
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Solution Overview
Problem
Existing indexable cutting inserts for material processing machines, particularly metal processing machines, are limited in versatility and longevity, failing to maintain desired cutting geometry over time due to inadequate design and functionality.
Innovation Solution
An indexable cutting insert with n-fold rotational symmetry around a first axis and 180-degree rotational symmetry about a second axis, featuring main cutting edges that form acute angles with orthogonal planes, and a cutting insert holder with a tilted support surface to maintain precise cutting geometry, allowing for extended use and reproducible cutting performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If conventional indexable cutting inserts are designed with limited cutting edges, then the initial cutting geometry can be achieved, but the service life and versatility are limited
Solution Approach 1:
The cutting insert is divided into multiple cutting edges (at least 4 main cutting edges and 4 secondary cutting edges) arranged on different sides of the insert body. Each edge can be used independently, allowing the insert to be indexed to a fresh edge after each cutting edge is worn, thereby extending service life while maintaining versatility for different cutting operations.
Solution Approach 2:
The cutting insert is designed with multiple cutting edges and secondary cutting edges that can perform different cutting functions. The insert can be used for various cutting operations by indexing to different edges, making a single insert versatile for multiple applications and extending its useful life beyond conventional single-use inserts.
2Productivity
If main cutting edges are designed to converge at small corner angles, then cutting performance is improved, but the length of main cutting edges is reduced
Solution Approach 1:
Instead of extending cutting edges in a single direction, the invention arranges multiple cutting edges in different spatial dimensions around the insert body. By distributing cutting edges on multiple sides and utilizing the third dimension (depth/height of the insert), the design achieves both short corner angles for good cutting performance and sufficient total cutting edge length through multiple edges available for indexing.
3Manufacturing precision
If cutting insert geometry is optimized for specific cutting angles, then cutting precision is improved, but the insert cannot maintain geometry over extended use
Solution Approach 1:
Multiple precisely engineered cutting edges are prepared in advance on the same insert body, each with identical precise geometry. When one edge wears and geometry degrades, the insert can be indexed to a pre-prepared fresh edge that restores the desired cutting geometry without requiring replacement, thus maintaining precision over extended operating time.
Data Source
AI summary
An indexable cutting insert for a cutting tool for material processing machines has a first axis of symmetry, at least one fastening bore passing through the indexable cutting insert parallel or coaxially to this first axis, two groups of main cutting edges, secondary cutting edges and cutting corners having a second axis of symmetry rotationally symmetrically opposite one another. At least the main cutting edges enclose an acute cutting edge angle with a plane oriented orthogonally to the first axis of symmetry. A cutting insert holder holds and fixes an indexable cutting insert. A recess for receiving the indexable cutting insert is on an elongated base body with polygonal cross-section. A support surface for supporting the indexable cutting insert is rotated about the base-body longitudinal axis and tilted about a second axis, a line of intersection between the rotated support surface and a plane perpendicular to the longitudinal axis.