Eccentric Scrap Knife Adjustment for Heavy Plate Trimming
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Solution Overview
Problem
Existing heavy plate trimming technologies face challenges in adjusting the scrap knife gap width and distance to accommodate varying sheet metal thicknesses, leading to potential damage to the trimmed edge or incomplete cutting, affecting precision and service life.
Innovation Solution
The scrap knife gap width and distance are dynamically adjusted by moving the scrap knives in a displacement vector with components transverse to both the trimming and scrap knife planes, utilizing a rotatable eccentric shaft connected to the scrap knife carriage guide, allowing for flexible adjustment based on sheet thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the scrap upper knife is mounted closer to the trimming edge, then the cutting precision is improved, but the trimmed edge may be damaged
Solution Approach 1:
The scrap knife carriage guide is made movable relative to the trimming knife plane through an eccentric shaft mechanism, allowing the scrap upper knife position to be dynamically adjusted based on sheet thickness rather than being fixed. This enables optimization of the distance between the scrap knife and trimming edge for different material conditions.
Solution Approach 2:
The position parameters of the scrap upper knife (distance to trimming edge and gap width) are made variable through the eccentric shaft adjustment mechanism. By changing these parameters according to sheet thickness, the system achieves both precise cutting and prevents edge damage.
2Duration of action of stationary object
If the scrap knife gap width is increased for thicker sheets, then the service life of knives is improved, but the distance between scrap cutter and plate must be increased, potentially causing incomplete cutting
Solution Approach 1:
Both the scrap knife gap width and the distance from the scrap upper knife to the trimming edge are made dynamically adjustable through the eccentric shaft mechanism. This allows simultaneous optimization of both parameters for different sheet thicknesses, ensuring complete cutting while maintaining knife service life.
3Object-affected harmful factors
If the scrap upper knife is mounted too far from the trimming edge, then edge damage is prevented, but the cutting edge will not cover the full width of the hem strip
Solution Approach 1:
The position of the scrap upper knife relative to the trimming edge is made dynamically adjustable through the eccentric shaft mechanism. This allows the system to optimize the distance for different sheet thicknesses, ensuring both edge damage prevention and complete hem strip coverage.
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
This solution ensures precise cutting without edge damage and maximizes the service life of the scrap knives by optimizing the scrap knife gap width and distance relative to the sheet thickness, enhancing the trimming process for both thin and thick sheets.
Implementation Method 1
rotating an eccentric shaft (21) which is operatively connected to the scrap knife carriage guide (20) in such a way that, when the eccentric shaft (21) is rotated, the scrap knife carriage guide (20) is displaced simultaneously in two directions, which are at least perpendicular to one another
Data Source
Figure 1a
Figure 1b~6
Figure 7~11
AI summary
With known trimming shears having a pair of scrap-cutting blades on the discharge side, the moving upper scrap-cutting blade must be moved as closely as possible past the trimmed plate edge in order to push the cutoff edge still hanging on the plate downward against the lower fixed scrap-cutting blade, which requires precise adjustment of the upper scrap-cutting blade. To that end, according to the invention, the distance between the upper scrap-cutting blade (2) or the lower scrap-cutting blade (3) and the trimming blade plane (5) is set prior to trimming in accordance with the thickness of each heavy plate (10) to be trimmed by displacement of the upper scrap-cutting blade (2) and/or the lower scrap-cutting blade (3) in a displacement direction with at least one component transverse to the trimming blade plane (5).