Saw Blade Neutral Toothing for Clean Bidirectional Cuts
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Solution Overview
Problem
Existing saw blades used for cutting kitchen worktops with dual-direction teeth fail to achieve a smooth cutting edge, leading to inefficiencies and tear-outs, especially when cutting thin materials.
Innovation Solution
A saw blade design featuring a butt toothing at one end, a tension toothing at the opposite end, and a neutral toothing in between, with varying tooth flank angles that decrease or increase gradually along the blade, ensuring the teeth at the ends have the lowest and highest cutting performance respectively, and the neutral teeth act as broaching teeth, while the angle bisectors intersect within a small circular area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dual-direction teeth are used in saw blade, then cutting capability in both directions is improved, but cutting edge smoothness deteriorates
Solution Approach 1:
The saw blade is divided into three distinct toothing zones: spur toothing at the first end for downward cutting, tension toothing at the second end for upward cutting, and neutral toothing in the middle section. Each zone has teeth with specific angle characteristics optimized for its function, eliminating the tear-outs caused by uniform dual-direction teeth while maintaining bidirectional cutting capability.
Solution Approach 2:
Different sections of the saw blade are given different tooth geometry properties. The spur toothing has teeth inclined for downward cutting, the tension toothing has teeth inclined for upward cutting, and the neutral toothing has teeth with reduced inclination angles. This local differentiation ensures smooth cutting edges in each zone while maintaining overall bidirectional cutting ability.
2Productivity
If teeth have high cutting performance at ends, then cutting efficiency is improved, but risk of cutting through wrong side of thin workpieces increases
Solution Approach 1:
The neutral toothing is positioned in the middle section of the blade to act as a buffer zone before the high-performance teeth at the opposite end engage the workpiece. This preliminary engagement with lower-cutting teeth reduces the risk of accidentally cutting through thin materials while the high-performance teeth at the working end maintain cutting efficiency.
Solution Approach 2:
The tooth flank angles are varied along the blade length, with the neutral toothing having reduced inclination angles compared to the spur and tension toothing. This parameter change creates a gradient in cutting aggressiveness, allowing efficient cutting at the working end while providing a safety buffer in the middle section.
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
The invention relates to a saw blade with a first tooth flank (7, 10, 13) pointing towards a first end (1) and inclined at a first angle (α1, α2, α3) to a line (8) perpendicular to the extension direction of the saw blade, and teeth (6, 9, 12) pointing towards a second end (2) and inclined at a second angle (β1, β2, β3) to the perpendicular line (8), which are arranged in a thrust toothing (3) adjacent to the first end (1), in which the first angles (α1) are larger than the second angles (β1), and which are arranged in a pull toothing (4) adjacent to the second end (2), in which the first angles (α2) are smaller than the second angles (β2).According to the invention, the teeth (12) which are arranged in a neutral toothing (5) located between the butt toothing (3) and the tension toothing (4) each have a first tooth flank (13) with a first angle (α3) to the vertical line (8) which is smaller than the first angles (α) of the butt toothing (2) and larger than the first angles (α2) of the tension toothing, and a second tooth flank (14) with a second angle (β3) to the vertical line (8) which is larger than the second angles (β1) of the butt toothing (3) and smaller than the second angles (β2) of the tension toothing (4).