Reciprocating Saw Blade With Micro-Structured Back Edge Deburring
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Solution Overview
Problem
Conventional reciprocating saw blades are prone to frequent replacement due to durability issues and pose safety risks during handling and orientation changes, as both edges often have cutting teeth, limiting user safety and versatility.
Innovation Solution
A bimetallic or trimetallic saw blade with a cutting edge made of high-speed steel and a back edge featuring a non-cutting micro-structured surface for deburring, providing improved grip and safety, and allowing dual functionality without orientation changes, using materials like low-alloy steel or carbon steel for the body and high-speed steel for the cutting edge, and optionally tool steel for enhanced wear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If both edges of the saw blade are provided with cutting teeth to increase versatility, then the blade can be used in different orientations, but user safety deteriorates due to the risk of injury when handling and changing orientations
Solution Approach 1:
The patent applies local quality by providing different surface characteristics to different parts of the blade. The cutting edge portion has a smooth surface suitable for cutting, while the back edge portion has a micro-structured non-cutting surface that provides grip safety. This localized differentiation allows the blade to be versatile in function while maintaining safety through distinct surface properties in different regions.
2Object-affected harmful factors
If the back edge portion is made smooth to improve handling safety, then user grip is enhanced, but the blade loses the ability to perform deburring functions
Solution Approach 1:
The patent applies parameter changes by modifying the surface topology of the back edge portion through micro-structuring. Instead of making the surface completely smooth or completely toothed, the invention introduces micro-scale structures (protrusions and recesses) that change the surface parameters to provide both grip safety for handling and deburring functionality for material removal.
3Ease of manufacture
If a flat back edge portion is used to simplify manufacturing, then production cost is reduced, but user grip and safety deteriorate
Solution Approach 1:
The patent applies the curvature principle by introducing micro-scale protrusions and recesses on the back edge portion surface. This micro-structuring creates a non-planar, three-dimensional surface topology that enhances grip characteristics while maintaining compatibility with standard manufacturing processes like rolling or embossing.
4Reliability
If the cutting edge portion uses high-speed steel to improve durability, then tooth durability is enhanced, but manufacturing complexity increases due to bimetallic construction
Solution Approach 1:
The patent applies composite materials by constructing the blade from bimetallic sheet material, combining low-alloy steel or carbon steel for the body portion with high-speed steel for the cutting edge portion. This composite construction optimizes the mechanical properties of each region while managing the complexities of multi-material manufacturing through established techniques like explosive welding or diffusion bonding.
Data Source
AI summary
A blade for a reciprocating saw, said blade being made from at least a bimetallic sheet material and comprising a flat body portion comprising a low-alloy steel material or a carbon steel material, a cutting edge portion comprising a high-speed steel material provided with a plurality of teeth arranged at a first edge of said flat body portion, and a back edge portion arranged at a second edge of said flat body portion opposite of said cutting edge portion, wherein said back edge portion is provided with a non-cutting micro-structured surface.