Hand-saw Blade Angled Apertures Chip Removal
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Solution Overview
Problem
Hand-saws with abrasive edges used for cutting softer materials suffer from unsatisfactory efficiency due to the inefficacy of chip removal and increased friction, leading to reduced cutting performance.
Innovation Solution
The hand-saw blade incorporates elongated apertures oriented at an angle between 15° and 65° relative to the cutting edge, which directs chips away from the teeth, reduces friction, and utilizes the pressure from chips and fibers to press the blade against the material, enhancing cutting efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional hand-saw blades are used for cutting, then the blade structure is simple, but the sawing efficiency is unsatisfactory due to poor chip removal and increased friction
Solution Approach 1:
The blade is segmented by introducing multiple elongated apertures that divide the solid blade structure into sections. These apertures create channels for chip removal and reduce the contact surface between the blade and workpiece, thereby reducing friction and improving sawing efficiency without compromising overall blade integrity
Solution Approach 2:
The blade is designed with elongated apertures that create a porous-like structure, allowing chips to be evacuated through the blade thickness. This porous configuration reduces the effective contact area between the blade and material, reducing friction and heat buildup while maintaining sufficient structural strength for cutting
2Object-generated harmful factors
If the blade contacts the material extensively, then structural strength is maintained, but friction increases and chip removal becomes inefficient
Solution Approach 1:
Material is extracted from the blade body to form elongated apertures that run through the thickness of the blade. These extracted portions serve as chip ejection channels, actively removing harmful chips from the cutting zone and reducing friction between the blade and workpiece while preserving the necessary structural strength in the remaining blade material
Solution Approach 2:
The chip removal mechanism is extended into the third dimension by creating apertures that traverse the blade thickness. This dimensional approach allows chips to be evacuated through the blade body rather than relying solely on lateral clearance, effectively removing harmful factors without reducing the blade's cutting edge strength
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
The angled apertures effectively remove chips, reduce friction, and increase the cutting efficiency of the hand-saw blade by ensuring better chip removal and maintaining blade strength, resulting in improved sawing performance.
Implementation Method 1
chips in the cutting area, as well as fibers protruding from the cut material, generate a pressure on an edge of the elongated apertures located opposite to a direction of movement of the hand-saw-blade. Due to the tilted orientation of the elongated apertures this pressure has a component pressing the teeth of the first edge of the hand-saw-blade against the material to be cut
Data Source
Figure 1~4
AI summary
A hand-saw-blade (1; 1' ; 1'' ; 1''' ) )- having a first edge (2a) provided with saw teeth (31-3n) and a plurality of elongated apertures (41-4m) spaced.apart in a direction of the first edge (2a) is disclosed. A direction (Da; Da') of elongation of the elongated apertures (41-4m) is oriented including an angle (α, α' ) of between 15 ° and 65 ° and especially between 20° and 55° and further especially between 25° and 45° relative to the first edge (2a). Furthermore, a hand-saw having this hand-saw-blade (1; 1'; 1 " ; 1''') and a handle or bow-shaped metal-frame is disclosed, wherein the handle is mounted at one edge of the hand-saw-blade ( 1; 1' ; 1''; 1 " ' ) other than the first edge (2a) respectively ends of the bow-shaped metal-frame are attached to opposing edges of the hand-saw-blade (1; 1'; 1''; 1" ' ) different from the first edge (2a).