Ceramic End Mill Center-Groove Structure for Thrust Cutting
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Solution Overview
Problem
Conventional radius end mills lack cutting ability at the center portion of the tool end surface, making them unsuitable for thrust and helical processes when cutting difficult-to-cut materials like heat-resistant alloys, as they fail to maintain cutting efficiency and uniformity across the entire surface.
Innovation Solution
A ceramic end mill design featuring center cut edges and end cutting edges that are continuous, with center grooves acting as rake faces and swarf discharge paths, ensuring cutting ability from the rotation axis to the outer peripheral side, and incorporating a configuration that enhances rigidity and swarf dischargeability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If end cutting edges are not continuous to the core in radial direction, then the structure is simplified, but the cutting ability at the center portion of the tool end surface deteriorates
Solution Approach 1:
The cutting edge structure is segmented into discrete types (peripheral, end, and center cutting edges) with clear functional boundaries. Each type is positioned and configured independently according to its specific function, avoiding unnecessary structural complexity while ensuring that center cutting edges are properly formed and continuous to the core for effective center portion cutting.
Solution Approach 2:
The end mill is designed with multi-functional cutting edges that can handle various cutting operations. The center cutting edges serve dual purposes: they provide cutting ability at the center portion and contribute to the overall structural integrity by being continuous to the core, thus maintaining both structural simplicity and cutting effectiveness.
2Productivity
If high speed cutting is performed on difficult-to-cut materials, then productivity is improved, but tool strength and heat resistance requirements increase
Solution Approach 1:
Different regions of the end mill are optimized for their specific functional requirements to handle high-speed cutting of difficult-to-cut materials. The peripheral cutting edges are designed with specific rake angles for efficient material removal at high speeds, the end cutting edges provide smooth transitions, and the center cutting edges enable thrust and helical processes. This localized optimization ensures that each region contributes to overall productivity while maintaining the necessary strength and heat resistance for ultrahigh-speed cutting.
Data Source
Figure 1
Figure 2(a)
Figure 2(b)
AI summary
[Problem] While a configuration is equivalent to a configuration where a cutting edge portion of a tool includes a core, cutting ability is provided to a part near a center of a tool end surface to secure an ability of handling a thrust process and a helical process that allow a cutting at the center part. [Solution] A cutting edge portion 1 includes gashes 8 and 9 between cutting edges 1A and 1A adjacent in a rotation direction. Center cut edges 10a to 10f are formed at parts of end cutting edges 2a to 2f constituting the cutting edges 1A close to a rotation axis O so as to face the rotation axis O. Center grooves 10A to 10F are formed on rear sides of the center cut edges 10a to 10f and the end cutting edges 2a to 2f in the rotation direction continuous with a radial direction. The center grooves 10A to 10F are continuous with positions where end cutting edge second surfaces 4a to 4f face the rotation axis O. Alternatively, the center grooves 10A to 10F are continuous with positions where the end cutting edge second surfaces 4a to 4f approach the rotation axis O. The end cutting edge second surfaces 4a to 4f are laid between the center cut edges 10a to 10f and the end cutting edges 2a to 2f. The center grooves 10A to 10F are formed between the end cutting edge second surfaces 4a to 4f and the center cut edges 10a to 10f positioned on a rear side of the end cutting edge second surfaces 4a to 4f in the rotation direction. The center grooves 10A to 10F pass on the rotation axis O. The center grooves 10A to 10F double as rake faces of the respective center cut edges 10a to 10f. The center grooves 10A to 10F are continuous with the gashes 8.