Cutting Insert Frustocone Face Seating Stability
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Solution Overview
Problem
Existing cutting inserts for milling, particularly double-sided indexable plates, face challenges in achieving secure and stable seating without substrate plates, leading to high production costs and limited chip removal performance due to sintering irregularities and the need for additional grinding processes.
Innovation Solution
A cutting insert with a frustocone face around the central mounting hole that tapers radially inward, allowing sintering irregularities to be corrected by tightening the mounting screw, providing a secure and stable seating without a substrate plate, and featuring additional flat support surfaces and grooves for enhanced chip removal and protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a continuously closed raised support surface is used to ensure secure seating of the cutting insert, then manufacturing precision and stability are improved, but production costs increase due to additional grinding processes after sintering
Solution Approach 1:
The invention applies a frustoconical surface (a curved surface) around the central mounting hole instead of a flat ground surface. This curved geometry self-compensates for sintering irregularities when the mounting screw is tightened, eliminating the need for additional grinding processes while ensuring secure seating of the cutting insert.
2Device complexity
If the cutting insert is designed without a substrate plate to reduce complexity, then device complexity is reduced, but seating stability and precision are worsened due to sintering irregularities
Solution Approach 1:
The frustoconical surface geometry provides self-centering and self-compensation capabilities that ensure stable seating directly on the tool holder support surface without requiring a substrate plate. The curved surface adapts to minor irregularities when clamped, maintaining reliability while simplifying the overall structure.
3Reliability
If the frustocone face taper angle is increased to improve correction of sintering irregularities, then seating stability is improved, but manufacturing precision of the frustocone face becomes more difficult to control
Solution Approach 1:
The invention specifies an optimal range for the taper angle (0.1° to 2°, preferably 0.3° to 0.35°) that balances the correction capability for sintering irregularities with the controllability of manufacturing precision. This parameter optimization ensures that the frustocone face can effectively compensate for irregularities while remaining manufacturable with standard precision.
Data Source
AI summary
The invention relates to a cutting insert, in particular for a milling work, with a basic body which respectively has on opposite sides peripheral cutting edges, which protrude beyond the respectively adjoining face regions (15), descending at a positive rake angle, in the middle of which one or more planar supporting surfaces (16) are arranged, and with a central fastening hole (12) for receiving a tensioning screw. Arranged around the central fastening hole is at least one conical surface (19), with a cone descending inwards, i.e. towards the fastening hole.