Tipped Saw Blade Tip Geometry for Low-Resistance Cutting
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Solution Overview
Problem
Existing tipped saw blades face challenges in achieving low cutting resistance and reduced cutting power, which affects efficiency and battery life in rechargeable tools and increases cutting time in stationary machines.
Innovation Solution
The tipped saw blade design incorporates a disc-shaped base metal with a plurality of tips, including flat edges and beveled edges, where the cutting edge line lengths are optimized to reduce cutting power. Specifically, the sum of cutting edge line lengths of the beveled edges is less than or equal to two times the sum of the cutting edge line lengths of the flat edges, and the cutting edge line-related length is kept below a certain threshold to minimize cutting power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cutting edge line length is increased to improve cutting stability, then the cutting power requirement increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the cutting edge line lengths of flat and beveled edges within specific mathematical relationships. The flat edge cutting edge line length is set to 0.4-0.8mm, and the beveled edge cutting edge line length is set to 0.2-0.5mm, with their sum satisfying specific formulas. This optimization of geometric parameters reduces the total cutting edge line length while maintaining cutting stability through the coordinated action of multiple edges with different orientations.
2Productivity
If the number of tips is increased to improve cutting efficiency, then the device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the cutting edge into multiple discrete tips (typically 3-5 tips) arranged around the blade periphery. Each tip has segmented edges (flat and beveled portions) that work in sequence. This segmentation allows the cutting action to be distributed across multiple smaller cutting elements, improving efficiency through repeated cutting while keeping each individual tip simple in structure.
Solution Approach 2:
The patent implements periodic action through the sequential engagement of multiple tips and edges during rotation. As the blade rotates, tips engage the workpiece in a periodic sequence, with each tip performing multiple cutting strokes. The flat and beveled edges of each tip work in alternating periodic fashion, creating a rhythmical cutting action that improves efficiency while maintaining simple blade structure.
Data Source
AI summary
A tipped saw blade includes a disc-shaped base metal and a plurality of tips. Each tip has an edge selected from a flat edge, a left beveled edge, and a right beveled edge. The tips are positioned circumferentially adjacent each other about a radially outer periphery of the base metal. Each flat edge includes a cutting edge that is oriented parallel to a thickness direction of the base metal. Each left beveled edge and each right beveled edge include a corresponding cutting edge that is inclined with respect to the thickness direction of the base metal. Cutting edge line lengths correspond to the lengths at which the cutting edges come in contact with a workpiece when cutting a workpiece. The cutting edges have the following relationship: (sum of cutting edge line lengths of the plurality of beveled edges)≤[((cutting edge line length of one of the flat edges)−(kerf thickness+1.5))×(number of the plurality of flat edges)×1.2].