V-Shaped Cutting Insert Geometry for Short Chip Formation
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Solution Overview
Problem
Existing cutting inserts used for producing V-shaped profiles in workpieces, particularly for V-belt pulleys, often result in long tangled chips during radial piercing, leading to process disturbances and machine downtime due to inadequate chip breaking, especially when working with ductile materials.
Innovation Solution
The cutting insert features a V-shaped piercing area with mirror-symmetrical cutting edges, chip guiding indentations, and chip breaker depressions and elevations strategically designed to deflect and break chips, with specific angles and orientations that promote plastic deformation and chip stiffening, preventing long chip formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional rake face with a simple depression is used, then chip breaking is promoted in some materials, but chip breaking is inadequate when piercing ductile materials
Solution Approach 1:
The rake face is equipped with multiple chip guiding indentations at different positions (first, second, and third indentations) with varying geometries and orientations. Each indentation is specifically designed to handle different chip flow conditions, providing localized chip control functions that collectively achieve effective chip breaking for ductile materials while maintaining versatility across different material types.
Solution Approach 2:
The chip breaking function is divided into multiple segments through the use of several distinct chip guiding indentations rather than a single depression. These segmented indentations work in sequence and in combination to progressively control and break chips, transforming the monolithic chip breaking approach into a multi-stage process that handles ductile materials effectively.
2Device complexity
If no chip breaking features are provided, then the cutting insert is simple, but long tangled chips form causing process disturbances and machine downtime
Solution Approach 1:
The chip guiding indentations are pre-configured on the rake face before cutting begins. These indentations create predetermined paths and deformation zones that actively guide and break chips as they form during the cutting process, preventing long tangled chip formation before it can cause process disturbances or require manual removal.
3Reliability
If chip breaking features are added to the rake face, then chip formation is improved, but the rake face geometry becomes more complex
Solution Approach 1:
The chip guiding indentations are defined by specific geometric parameters including depths (first, second, and third depths), orientations (first, second, and third orientations), and positions relative to the cutting edge. By optimizing these parameters within specific ranges, the patent achieves effective chip breaking while controlling the complexity of the rake face geometry through systematic parameter management rather than arbitrary feature addition.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively breaks chips into shorter, manageable lengths, reducing machine downtime and improving productivity by ensuring efficient chip removal and maintaining cutting insert stability.
Implementation Method 1
chip formation, which takes place plastically in such a way that the sliding of the chip into the respective chip deflection depression creates beads along the longitudinal axis of the chip in the chip, which lead to a chip stiffening
Data Source
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AI summary
A cutting insert (2, 201, 202, 203, 204, 205), which is designed to produce a V-shaped profile (1002) in a workpiece (1000) by radial plunging with respect to a workpiece rotation axis (1001) of the workpiece (1000), comprising a reference plane (100) and a V-shaped plunging area (1, 101, 102, 103, 104), the V-shaped plunging area (1, 101, 102, 103, 104) comprising, among other things, two cutting edges (3, 4) contained in the reference plane (100), a rake face (7) and several elongated chip-guiding recesses (8, 8', 8", 80, 80', 80") in the rake face (7), each of which is parallel to a cutting edge (3, 4) contained in the reference plane (100). (100) containing recession extension axis (10), which has improved chip formation compared to the prior art, it is proposed that the recession extension axes (10) each extend under a recession chip guiding angle (12) in the range of 0° to 45°.