Double Cutting Disc Structure for Higher Critical Rotational Speed
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Solution Overview
Problem
Existing rotary cutting discs face limitations in structural integrity, dynamic stability, and rotational speed due to resonance frequencies and centrifugal forces, leading to inefficiencies and potential mechanical failures.
Innovation Solution
A rotary cutting disc design comprising two coaxial, mutually opposed disc-shaped elements with circumferential edges joined to form a cutting edge, featuring at least partly curved elongated deformation lines that increase radially along their length, enhancing dynamic stability and critical rotational speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the cutting disc is made thinner to reduce material removal and power consumption, then cutting efficiency is improved, but structural integrity and dynamic stability deteriorate due to centrifugal forces and resonance
Solution Approach 1:
The cutting disc is divided into two separate disc-shaped elements that are coaxially arranged and mutually opposed. These elements are joined at their circumferential edges to form a complete cutting edge, while maintaining a gap between their inner regions. This segmentation allows each element to be thinner and lighter individually, improving cutting efficiency, while the distributed mass and structural arrangement maintain overall structural integrity and dynamic stability during rotation.
2Productivity
If the rotational speed is increased to improve cutting efficiency, then productivity increases, but dynamic stability deteriorates due to resonance and critical frequency limitations
Solution Approach 1:
By segmenting the cutting disc into two separate elements arranged coaxially and oppositely, the mass distribution is optimized to improve rotational dynamics. The segmented structure reduces resonance effects and raises the critical frequency, allowing the disc to operate stably at higher rotational speeds without experiencing the severe deformations that would limit a monolithic disc of comparable thickness.
Solution Approach 2:
The invention transitions from a single-plane monolithic structure to a three-dimensional coaxial arrangement of two elements. This dimensional change allows the cutting disc to exploit spatial distribution of mass to improve dynamic characteristics, enabling stable operation at higher speeds by avoiding resonance conditions that would occur in a conventional single-element design.
3Productivity
If the cutting disc operates above critical frequency to maintain productivity, then cutting efficiency is maintained, but deformation increases leading to wider cut and material waste
Solution Approach 1:
The two-element segmented structure distributes the centrifugal forces and reduces resonance-induced deformations compared to a monolithic disc. This allows the cutting disc to operate at higher rotational speeds without experiencing the severe radial and tangential deformations that would cause the cutting line to widen and deviate, thereby maintaining cutting precision while preserving productivity.
4Use of energy by moving object
If the cutting disc is made thinner to reduce power consumption, then energy efficiency improves, but dynamic stability deteriorates due to increased resonance effects
Solution Approach 1:
The segmented two-element design enables each element to be thinner than a conventional monolithic disc would need to be for equivalent strength. This reduces the overall mass and moment of inertia, lowering power consumption during operation. Simultaneously, the distributed mass arrangement and coaxial configuration improve dynamic stability by reducing resonance effects, allowing thin elements to rotate stably at higher speeds.
Data Source
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AI summary
A rotary cutting disc (10) comprising two coaxial mutually opposed disc-shaped elements (12a, 12b) each having a circumferential edge, wherein circumferential edges (14a, 14b) of the disc-shaped elements (12a, 12b) are joined together forming a cutting edge (16) of the cutting disc (10); wherein each of the disc-shaped elements (12a, 12b) comprises one or more at least partly curved elongated deformation lines (30), wherein the one or more deformation lines (30) have a radial distance from the centre (26) of the cutting disc (10) that increases along at least a part of the length of the deformation line (30). The rotary cutting disc (10) has an increased critical speed that allows improving the efficiency of a cutting operation with a cutting disc while maintaining acceptable levels of quality, cutting precision and safety.