Polygonal Cutting Blade Arc-Groove Clamping for Stable Positioning
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Solution Overview
Problem
Concentrically clamped cutting blades experience instability and rapid wear due to limited contact area between the fastener and the cutting blade, leading to vibration, reduced efficiency, and shortened service life.
Innovation Solution
A polygonal cutting blade with a central hole featuring circular arc-shaped grooves that accommodate a fastening screw, providing multi-point repeated positioning clamping and improved rigidity, allowing for vertical clamping force direction and adjustable clamping restraints to prevent vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the fastener is arranged away from the center of the round hole to ensure contact between the cutting blade side surface and cutter groove side surface, then the contact between cutting blade and cutter groove is improved, but the contact area between fastener and cutting blade is reduced to a small area or point contact
Solution Approach 1:
The patent applies curvature by transforming the traditional point contact or small area contact into a circular arc-shaped groove that provides continuous multi-point contact. The circular arc groove fits with the fastening screw surface, creating a curved contact path that increases the effective contact area and distributes the clamping force along the arc, thereby resolving the contradiction between ensuring side surface contact and maintaining sufficient fastener contact area.
Solution Approach 2:
The patent segments the contact interface by introducing a circular arc-shaped groove with multiple positioning points along its arc. This segmentation allows the fastening screw to contact the cutting blade at multiple discrete points distributed along the circular arc, transforming a single small contact area into multiple contact points that collectively provide sufficient clamping stability while maintaining the necessary offset from the hole center.
2Force
If the fastener provides enough clamping force through small-area contact, then the cutting blade can be securely held, but the fastener is easily distorted to induce cutting vibration in many directions
Solution Approach 1:
The circular arc-shaped groove provides a curved contact path that guides and constrains the fastening screw, preventing distortion in multiple directions. The curvature of the groove naturally directs the clamping force along a controlled arc path, reducing unwanted lateral distortion and vibration while maintaining sufficient clamping force.
Solution Approach 2:
The circular arc-shaped groove acts as an intermediary element between the fastening screw and the cutting blade body. It mediates the force transmission by providing a controlled contact interface that distributes the clamping force evenly along the arc, preventing direct distortion of the fastener and reducing cutting vibrations.
3Device complexity
If the fastener contacts the central hole in a small-area manner, then the structure is simple, but the cutting blade easily chips at high speed cutting and service life is short
Solution Approach 1:
The circular arc-shaped groove introduces a curved geometric feature that significantly improves fastener contact and force distribution. While this adds some structural complexity, the benefit is substantial: the curved groove prevents fastener distortion, eliminates chipping at high speeds, and extends service life by providing stable multi-point contact throughout the cutting operation.
Solution Approach 2:
The patent transitions from a simple radial offset arrangement (2D plane) to a circular arc groove that adds a curved dimensional element. This dimensional change creates a three-dimensional contact path along the arc, allowing the fastener to maintain stable contact at multiple points while accommodating the forces generated during high-speed cutting, thereby improving reliability without excessive complexity.
Data Source
AI summary
A polygonal cutting blade having a circular arc-shaped groove in a hole includes a blade body composed of an upper surface, a lower surface and a plurality of main side surfaces connecting the upper surface and the lower surface. The blade body has a central hole penetrating through the upper surface and the lower surface, and is centrally symmetrical about a central axis of the central hole. At least one set of positioning side surface comprised of adjacent two of the main side surfaces is provided. An inner surface of the central hole has at least one circular arc-shaped groove fitting with a fastening screw for fixing the cutting blade. The circular arc-shaped groove directly faces toward an intersection of the two main side surfaces of the set of positioning side surface. A groove central axis of the circular arc-shaped groove has an offset distance from the central axis.