Recip Saw Blade Tooth Pattern for Longer Life and Fewer Burrs
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Solution Overview
Problem
Existing recip or jig saw blades with negative rake angles on cutting teeth do not provide long enough blade life and generate excessive burrs or burrs of excessive size when cutting metal work pieces.
Innovation Solution
A recip blade design featuring a repeating pattern of cutting teeth, where the leading tooth has a negative rake angle and the trailing teeth have less negative or positive rake angles, reducing burr formation and enhancing blade life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If negative rake angles are used on cutting teeth to make the blade robust, then blade life is improved, but excessive burrs are generated
Solution Approach 1:
The patent applies different rake angles to different teeth within the same repeating pattern. The leading tooth has a negative rake angle for robustness and blade life, while the trailing tooth has a positive rake angle for clean cutting and reduced burr generation. This local differentiation of cutting tooth properties resolves the contradiction between blade life and burr generation.
2Strength
If negative rake angles are used on cutting teeth, then the blade becomes more robust, but cutting precision deteriorates due to excessive burrs
Solution Approach 1:
The patent differentiates the rake angle properties between leading and trailing teeth. The leading tooth with negative rake angle provides robustness and strength, while the trailing tooth with positive rake angle ensures precise, burr-free cutting. This local quality differentiation simultaneously achieves both blade robustness and cutting precision.
3Duration of action of stationary object
If uniform negative rake angles are used on all teeth, then blade life is extended, but additional deburring work is required
Solution Approach 1:
The patent implements a repeating pattern where leading teeth have negative rake angles for blade life extension, while trailing teeth have positive rake angles that produce burr-free cuts. This eliminates the need for additional deburring operations on trailing teeth, thereby reducing total deburring time while maintaining extended blade life.
Data Source
AI summary
A recip blade has a cutting edge defining a cutting direction and a repeating pattern of cutting teeth. Each repeating pattern includes (i) a leading tooth with respect to the cutting direction that includes a rake face defining a first rake angle that is negative, and (ii) a trailing tooth following the leading tooth with respect to the cutting direction that includes a rake face defining a second rake angle that is greater than the first rake angle.