Saw Blade Transition Region for Low-Weight Bending Stiffness
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Solution Overview
Problem
Existing sawing tools face challenges with varying tool receptacles, application materials, and high cutting forces, leading to inefficiencies and increased energy demand, particularly in battery-operated hand-held power tools.
Innovation Solution
A sawing tool design with a transition region between the connecting and functional regions, featuring increased bending stiffness and optimized weight distribution, utilizing a main body with reduction grooves and a set saw toothing, allowing for low weight and high stiffness, and incorporating materials like heat-treatable steel and nickel for enhanced performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the main body is made thinner to reduce weight, then the total weight decreases, but the bending stiffness decreases
Solution Approach 1:
The patent applies local quality by creating a transition region with different geometric properties than the functional region. The transition region has increased material thickness and optimized cross-sectional geometry to provide higher bending stiffness specifically where needed for structural support, while the functional region maintains reduced thickness for weight optimization. This localized differentiation allows the blade to achieve both low overall weight and sufficient bending stiffness in critical areas.
Solution Approach 2:
The blade is segmented into distinct regions with different functional requirements: the connecting region for attachment, the transition region for structural support and stiffness, and the functional region for cutting operations. This segmentation allows each region to be optimized independently - the transition region can have increased thickness for stiffness without compromising the weight optimization of the functional region, thereby resolving the contradiction between overall weight reduction and localized bending stiffness requirements.
2Strength
If the main body is made thicker to increase bending stiffness, then the bending stiffness increases, but the total weight increases
Solution Approach 1:
Instead of uniformly thickening the entire main body, the patent applies local quality by concentrating the increased thickness specifically in the transition region where structural support is needed. The functional region maintains its reduced thickness for weight optimization. This localized approach to increasing thickness achieves the required bending stiffness improvement without the penalty of proportionally increasing the overall weight of the blade.
Solution Approach 2:
The segmentation of the blade into functionally distinct regions allows the transition region to be thickened for stiffness enhancement without forcing the entire blade to be thicker. This regional differentiation enables selective reinforcement only where structurally necessary, thereby achieving improved bending stiffness with minimal impact on total weight.
3Productivity
If the moment of inertia is increased to improve cutting performance, then the cutting performance improves, but the weight increases
Solution Approach 1:
The patent applies local quality by optimizing the moment of inertia specifically in the transition region through increased thickness and optimized cross-sectional geometry. This localized increase in moment of inertia improves cutting performance and structural rigidity without requiring the entire blade to have high moment of inertia, thereby avoiding proportional weight increase across the whole blade.
Solution Approach 2:
By segmenting the blade into regions with different functional requirements, the patent allows the transition region to have increased moment of inertia for improved cutting performance while the functional region maintains reduced mass. This segmentation enables selective optimization of moment of inertia only where it contributes most to cutting performance, minimizing the overall weight penalty.
Data Source
AI summary
The disclosure relates to a sawing tool, in particular a saw blade, comprising: at least one connection part, which at least partly forms a connection region for connecting to a tool receptacle of a hand-held power tool; at least one main body, in particular one single-piece main body, which is connected to the connection part; at least one array of saw teeth, in particular one array of set saw teeth, which is arranged on the main body; and at least one functional region, in particular one reduction groove region, which is arranged on the main body and on which the array of saw teeth is at least partly arranged. According to the disclosure, the sawing tool has at least one transition region, which is arranged between the at least one connection region and the at least one functional region and which has increased flexural stiffness, in comparison to the functional region, in a direction orthogonal and/or parallel to a cutting plane of the array of saw teeth.