Set Carbide Saw Blade Teeth Using Ductile Weld Fusion Zones
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Solution Overview
Problem
Existing saw blades with fine pitch struggle to effectively attach and set hard metal cutting tips or strips due to their small size, leading to difficulties in welding, brazing, or attaching them to the blade body, which results in fracturing or damage, especially when trying to set teeth in different directions.
Innovation Solution
The saw blade design incorporates hard metal strips with full cutting teeth that are attached to the blade body using ductile weld fusion zones, allowing for the teeth to be set by bending the weld zones, forming angled side faces to create a parallelogram shape, enabling effective setting of teeth without traditional bending forces that could cause fracturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hard metal cutting tips or inserts are attached to fine pitch saw blade teeth, then cutting performance on hard materials is improved, but the tips are too small to effectively weld, braze, or attach them to the teeth
Solution Approach 1:
The hard metal cutting element is divided into a tip portion and a holder portion. The holder portion is attached to the tooth while the tip portion extends forward to perform cutting. This segmentation allows the larger holder to be easily attached to the fine pitch tooth while maintaining the cutting effectiveness of the hard metal tip.
Solution Approach 2:
A holder portion acts as an intermediary between the fine pitch tooth and the hard metal tip. The holder provides a larger attachment surface area that facilitates reliable welding or brazing, while still supporting the hard metal cutting tip. This intermediary structure resolves the attachment difficulty of directly attaching small tips to fine pitch teeth.
2Reliability
If teeth are set by traditional bending forces to create angled directions, then cutting performance is improved, but the hard metal teeth or carbide strips tend to fracture or damage
Solution Approach 1:
The setting mechanism transitions from direct bending of hard metal teeth to bending a more ductile holder or weld material. The hard metal tip remains relatively static while the holder or weld zone deforms to create the set angle, reducing fracture risk.
Solution Approach 2:
The weld fusion zone or holder acts as an intermediary that absorbs the bending stress during setting. Instead of directly bending the brittle hard metal tooth, the ductile weld material or holder deforms to create the angled configuration, protecting the hard metal tip from fracture.
3Adaptability or versatility
If hard metal strips with multiple teeth are set in different directions, then cutting versatility is improved, but the setting operation causes weakness in the attachment joint or damages the carbide teeth
Solution Approach 1:
Each hard metal cutting element is segmented into a tip portion and a holder portion. This allows individual tips to be set in different directions by deforming their respective holders or weld zones without affecting adjacent teeth, maintaining attachment joint strength while achieving cutting versatility.
Solution Approach 2:
The setting process dynamically deforms only the holder or weld fusion zone of each individual tooth, leaving the hard metal tip intact. This selective deformation enables different set directions for different teeth while preserving the overall attachment joint strength.
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
This approach allows for longer blade life and improved cutting performance, particularly on fine pitch saw blades, with the ability to mix carbide grades for enhanced versatility in cutting various materials, such as cast iron, stainless steel, and carbon steel.
Implementation Method 1
attached to the blade body using ductile weld fusion zones, allowing for the teeth to be set by bending the weld zones
Data Source
AI summary
A saw blade includes an elongated body with a working edge extending along a longitudinal axis. A first strip composed of carbide or cermet and including at least one first full cutting tooth is coupled to a first portion of the working edge by a first weld fusion zone composed of a ductile material. The first strip is set in a first direction at a first angle out of a plane of the body by a first bend in the first weld fusion zone. A second strip composed of carbide or cermet and including at least one second full cutting tooth is coupled to a second portion of the working edge by a second weld fusion zone composed of a ductile material. The second strip is set in a second direction, opposite the first direction, at a second angle out of the plane of the body by a second bend in the second weld fusion zone.