Reciprocating Saw Blade With Welded Ceramic Tips for Longer Wear
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Solution Overview
Problem
Reciprocating saw blades face challenges in incorporating cubic carbides due to their low thermal conductivity, making welding or brazing difficult, especially with many small joint interfaces, which limits their use in improving wear life and cutting efficiency.
Innovation Solution
Welding cemented ceramic tips made of tungsten carbide and cubic carbides with a metal matrix material to the blade body, overcoming thermal conductivity issues and creating a metallurgical bond for improved hardness and wear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If cubic carbides are incorporated into saw blade teeth, then wear life and hardness are improved, but welding and brazing become difficult due to low thermal conductivity
Solution Approach 1:
The patent uses composite cemented ceramic tips combining tungsten carbide particles (high thermal conductivity) with cubic carbide particles (low thermal conductivity but superior hardness). This composite structure allows the material to maintain weldability through the tungsten carbide component while achieving enhanced wear resistance from the cubic carbide component, thus resolving the contradiction between improved wear life and manufacturing difficulty.
2Manufacturing precision
If many small joint interfaces are present in the blade, then cutting precision is improved, but welding complexity increases due to cumulative thermal conductivity issues
Solution Approach 1:
The patent changes the thermal conductivity parameter of the tip material by incorporating tungsten carbide particles into the cemented ceramic composition. This parameter change enables successful welding even across multiple small joint interfaces, allowing the blade to achieve high cutting precision with many teeth without proportionally increasing welding complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The approach results in higher hardness at operating temperatures, increased wear life, and faster cutting performance for reciprocating saw blades, with the cemented ceramic tips exhibiting twice the performance of conventional tungsten carbide tipped blades.
Implementation Method 1
The other ceramic particles are made of at least one ceramic material having a hardness of at least 1500 HV10 and a thermal conductivity of 50 W/mK or less
Implementation Method 2
A tip is welded to the base, and the tip is made of a cemented ceramic material
Data Source
AI summary
Embodiments of the disclosure relate to a reciprocating saw blade. The reciprocating saw blade includes a body having a first end, a second end spatially disposed from the first end, a spine edge, and a cutting edge opposite to the spine edge. The reciprocating saw blade also includes a plurality of teeth defining a cutting portion of the cutting edge. Each tooth of the plurality of teeth includes a base having a unitary construction with the body. The base is made of a first material having a first hardness. A tip is welded to the base, and the tip is made of a cemented ceramic material having a second hardness that is greater than the first hardness. The cemented ceramic material includes tungsten carbide particles and at least 3 wt % of other particles including one or more cubic carbides.