Parallelepipedic Milling Insert With Eight Active Cutting Corners
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Solution Overview
Problem
Existing milling tools with tangentially mounted cutting inserts can only utilize four cutting corners for one direction of rotation, leading to passive cutting edges being worn out, as they are not designed for simultaneous use in the same direction.
Innovation Solution
A cutting insert with eight cutting corners, featuring clearances between them to prevent interference and allowing all corners to be used for the same direction of rotation, is designed for a milling tool with a 90° setting angle, utilizing a parallelepipedic shape and cemented carbide material with Al2O3, TiN, or TiCN coatings, and incorporating nose cutting edges with a convenient radius of curvature for effective chip removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If four cutting corners are distributed on two sides for chip removing machining, then the cutting insert can be used for clockwise and anticlockwise rotary machining, but only four cutting corners can be utilized in one and the same milling tool and the passive minor cutting edges may be worn during machining
Solution Approach 1:
The cutting insert is divided into eight distinct cutting corners, with four active cutting corners and four inactive cutting corners clearly segmented. The inactive cutting corners are positioned to avoid interference with the machining path, while the active cutting corners are optimized for cutting performance. This segmentation allows all eight corners to be utilized in the same direction of rotation without interference.
Solution Approach 2:
The cutting insert design moves from a traditional two-sided configuration to an eight-corner configuration distributed around the insert perimeter. By arranging cutting corners in multiple dimensions around the insert body, the design enables all eight corners to be accessed during machining in the same rotation direction, effectively utilizing the three-dimensional space of the insert.
2Quantity of substance
If eight cutting corners are distributed on two sides with four corners for clockwise and four for anticlockwise machining, then the cutting insert has more cutting corners, but the passive minor cutting edges are worn and cannot be used effectively
Solution Approach 1:
All eight cutting corners of the insert are designed to function for machining in the same direction of rotation. The inactive cutting corners are positioned and shaped to serve as additional active cutting corners when the insert is indexed to different positions, making the insert universally applicable for all eight corners in the same rotation direction without requiring different corner configurations for different rotation directions.
3Productivity
If cutting corners are positioned close together to maximize cutting edges, then more cutting corners are available, but inactive cutting corners interfere with active cutting corner during machining
Solution Approach 1:
Different regions of the cutting insert are given different qualities and functions. The active cutting corners are positioned and shaped for optimal cutting performance, while the inactive cutting corners are positioned in locations that prevent interference with the machining path. The clearance between cutting corners is specifically designed to eliminate interference while maintaining compact overall dimensions.
Data Source
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AI summary
The present invention relates to an indexable milling insert (1) having parallelepipedic shape, the cutting insert (1) comprising a mounting hole (3) placed centrally in the cutting insert (1), a first support side (ST1) and a second support side (ST2), which support sides (ST1, ST2) are parallel with each other and act as alternating support sides (ST1, ST2), that the cutting insert (1) is provided with main cutting edges (H1-H8),whichare orientated perpendicularly tothe centre axis (C) of the mounting hole (3) as well as providedin such a way that a rotation of the cutting insert (1) around the centre axis (C) of the mounting hole (3) to analternative insert seat alternatively a turning of the cutting insert(1) to analternative insert seat provides an identical location of the maincutting edges (H1-H8) in relation to a piece to be machined. The invention also relates to a milling tool equipped with milling inserts according to the present invention. The cutting insert (1) according to the present invention comprises four identical sides (S1-S4) for chip removing machining.The sides (S1-S4) extend between the parallel support sides (ST1, ST2). Each side (S1-S4) has exactly two cutting edge areas (SEO1, SEO5 and SEO2, SEO6, respectively, and SEO3, SEO7 and SEO4, SEO8, respectively).