Helical Knife Rollers for Continuous Strip Cutting Angle Control
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Solution Overview
Problem
Existing cutting systems for continuous strips in tire reinforcement are bulky, require high energy consumption, have limited cutting angle ranges, and result in reduced production throughput due to the need to stop the strip during cutting.
Innovation Solution
A cutting system using contrarotating cutting rollers with helical blades and a variable synchronizer to adjust the cutting angle dynamically, allowing precise and high-throughput cutting with low energy expenditure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a guillotine type rectilinear blade is used to cut the continuous strip, then the strip can be cut over all its width, but the cutter becomes relatively bulky and requires high cutting forces
Solution Approach 1:
The cutting operation is segmented into multiple passes, with each blade cutting only a portion of the strip width. The strip is fed incrementally between cuts, allowing a compact blade to achieve complete width cutting through sequential operations rather than requiring a single large blade to cover the entire width at once.
Solution Approach 2:
The cutting process transitions from a single-plane operation to a multi-dimensional process by adding the feed direction as a second dimension. The strip is advanced in the feed direction between cuts, transforming a width-based cutting problem into a combination of width cutting and length feeding operations.
2Manufacturing precision
If the strip is stopped during cutting to prevent deformation, then cutting precision is maintained, but production throughput is reduced
Solution Approach 1:
The cutting operation is designed to proceed continuously without stopping the strip feed. Multiple blades operate in sequence on the moving strip, allowing the useful action of cutting to continue uninterrupted while the strip advances, eliminating idle time between cuts and maintaining constant production flow.
Solution Approach 2:
The strip is pre-positioned and tensioned before cutting begins, and the cutting sequence is pre-planned with multiple blades positioned at different locations. This preliminary preparation allows the cutting to proceed continuously on the moving strip without needing to stop for repositioning or tensioning adjustments.
3Manufacturing precision
If a guillotine cutter is used to section the strip, then cutting is achieved, but high cutting forces are required consuming a great deal of energy
Solution Approach 1:
The total cutting force requirement is segmented and distributed across multiple smaller blades rather than concentrated in one large blade. Each blade cuts a portion of the strip width, dividing the total energy consumption into smaller incremental cuts that require less force per blade while achieving the same overall cutting result.
Solution Approach 2:
Each individual blade performs only a partial cutting action on a portion of the strip width rather than attempting to cut the entire width at once. This partial action approach reduces the force and energy required per blade, with the complete cutting effect achieved through the cumulative action of multiple blades.
4Device complexity
If the cutting angle range is restricted for mechanical feasibility, then the cutter structure is simplified, but the versatility of the cutting system is limited
Solution Approach 1:
The cutting system incorporates adjustable blade positions and orientations that can be dynamically reconfigured for different cutting angles. The blades and feed mechanism can be adjusted to accommodate various cutting angles without requiring complete structural redesign, enabling the system to adapt to different cutting requirements while maintaining mechanical feasibility.
Solution Approach 2:
The cutting system is designed with universal components that can perform multiple cutting angle operations. The same basic cutter structure and blade assembly can be configured for different cutting angles by adjusting blade positions and feed rates, making the system versatile for various cutting applications without requiring specialized equipment for each angle.
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
Enables sharp, precise cuts with a wide range of cutting angles and adaptability, compensating for strip deformation, and maintaining continuous production without stopping the strip.
Implementation Method 1
use of cutting rollers of this kind provided with a helical blade enables a cutting pressure to be exerted on a virtually point zone of the continuous strip that moves over the width of the continuous strip as the rollers rotate. It is therefore possible to exert on the continuous strip a very high shear stress and therefore to obtain easily a sharp cut
Data Source
AI summary
The cutting system is configured to cut a continuous strip which extends lengthwise in a longitudinal direction and widthwise between a first edge and a second edge into strips. The cutting system includes a drive device which imparts to the continuous strip a feed speed, a first cutting roller and a contrarotating second cutting roller that cooperate to cut the continuous strip across its full width. The first cutting roller is provided with a first helical blade and is driven in rotation A variable synchronizer makes it possible to select and to modify the synchronization ratio between the rotational speed of the first cutting roller and the non-zero forward speed of the continuous strip in such a way as to be able to adjust the cutting angle according to which the cross-section of the continuous strip is oriented with respect to the longitudinal direction of the continuous strip.