Saw Blade Tooth Geometry for Faster Cutting With Less Insert Wear
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Solution Overview
Problem
Conventional saw blades with carbide inserts face challenges in efficiently cutting hard materials like metal while minimizing damage to the cutting inserts and achieving optimal cutting speed and durability, and they often require a higher number of expensive cutting inserts.
Innovation Solution
The saw blade design incorporates cutting teeth with a positive rake angle and relief faces, along with gullets featuring undercut portions positioned opposite the cutting direction, and material limiters to guide material effectively into adjacent teeth, reducing insert wear and allowing for fewer, more durable cutting inserts, and a manufacturing method that includes stamping to form these features efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional saw blades use carbide inserts to cut hard materials, then cutting capability is improved, but insert wear and damage increase
Solution Approach 1:
The patent changes the geometric parameters of the cutting tooth by introducing a positive rake angle and an undercut portion. The positive rake angle reduces the contact pressure between the insert and workpiece, while the undercut portion minimizes material contact area. These parameter changes allow the insert to cut hard materials effectively while reducing wear and damage, thereby improving both cutting capability and insert durability.
2Area of stationary object
If conventional saw blades use more cutting inserts, then cutting coverage is improved, but cost increases
Solution Approach 1:
The patent modifies the tooth geometry parameters including positive rake angle and undercut depth to optimize cutting performance. These parameter changes enable each insert to cut more effectively and last longer, allowing reduced insert density while maintaining or improving overall cutting coverage, thus lowering the quantity of inserts needed and reducing cost.
3Speed
If conventional saw blades use positive rake angle teeth, then cutting speed is improved, but insert wear increases
Solution Approach 1:
The patent combines the positive rake angle parameter with an additional undercut portion parameter. The positive rake angle enables faster cutting by reducing resistance, while the undercut portion compensates for the increased wear by reducing the contact area between insert and workpiece. This combination of parameter changes allows high cutting speed while minimizing insert wear.
Data Source
AI summary
A saw blade includes a body and a plurality of cutting teeth formed on the body. The plurality of cutting teeth include a first cutting tooth having a tip adjacent a first end of the first cutting tooth, a rake face defining a rake face line extending from the tip toward the body at a positive rake angle, and a relief face extending from the tip toward a second end of the first cutting tooth. The saw blade also includes a plurality of gullets formed on the body between the plurality of cutting teeth. The plurality of gullets include a first gullet forming an undercut of the first cutting tooth. At least a portion of the undercut is positioned on a side of the rake face line in a direction opposite a cutting direction of the saw blade.