Saw Blade Grooves and PCD Roughness for Friction Reduction
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Solution Overview
Problem
Tipped saw blades used for cutting wooden boards face issues with resin and saw dust adherence, leading to increased friction coefficients and power consumption, which reduces their lifespan despite having high wear-resistant cutting tips.
Innovation Solution
The saw blade features a disc-shaped base metal with radially extending curved grooves and cutting tips made of sintered polycrystalline diamond (PCD) with rake faces having a surface roughness of 1 to 3.4 µm, reducing friction and adherence by preventing continuous contact with the workpiece and enhancing wear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If cutting tips with high wear resistance (sintered PCD) are used, then the lifetime of the saw blade is extended, but resin and saw dust adherence to the base metal increases, causing friction and power consumption issues that still require blade replacement
Solution Approach 1:
The base metal surface is segmented into multiple grooves that divide the continuous contact area into separate sections. These grooves create discrete contact zones between the base metal and the workpiece, reducing the overall adherence area for resin and saw dust accumulation.
Solution Approach 2:
The harmful adherence-prone continuous surface is extracted and replaced with a grooved structure. The grooves remove the problematic continuous contact area, leaving only the necessary cutting edges while eliminating the large flat surfaces where resin and saw dust would accumulate.
2Manufacturing precision
If the base metal surface is made smooth, then the cutting precision is improved, but the friction coefficient increases and resin adherence worsens
Solution Approach 1:
Different surface qualities are applied to different areas: the cutting edges maintain smooth surfaces for precision cutting, while the base metal surface incorporates grooves with rougher characteristics that reduce friction and resin adherence. This local differentiation allows each area to optimize its specific function.
Solution Approach 2:
The grooves introduce curved surfaces instead of flat planes on the base metal. These curved grooved surfaces reduce the contact area and friction with the workpiece while maintaining the precision needed at the cutting edges, as the curvature prevents continuous flat surface contact.
3Object-affected harmful factors
If grooves are added to the base metal to reduce resin adherence, then the friction coefficient decreases, but the device complexity increases
Solution Approach 1:
The base metal is given a grooved structure that creates a porous-like surface topology. This network of grooves provides multiple small cavities and surfaces that prevent resin and saw dust from forming continuous adhesive layers, reducing friction while maintaining structural integrity.
4Object-affected harmful factors
If the rake face surface roughness is increased to reduce resin adherence, then the friction coefficient decreases, but the cutting edge sharpness may be compromised
Solution Approach 1:
Different surface roughness qualities are applied locally: the rake face has increased roughness (Rz 1-3.4 μm) to reduce resin adherence and friction, while the cutting edges themselves maintain the sharpness needed for precision cutting. This local differentiation allows both goals to be achieved simultaneously.
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 design significantly reduces the friction coefficient and adherence of resin and saw dust, extending the saw blade's lifetime by distributing force evenly and maintaining low cutting resistance.
Implementation Method 1
the friction coefficient of the base metal with respect to the workpiece can be reduced, and additionally the resin and saw dust adherence to the base metal can also be reduced
Implementation Method 2
the friction coefficient of the rake face with respect to the workpiece can further be reduced
Data Source
Figure 1
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AI summary
A right side face (11a) and a left side face (11b) define the circular surfaces on opposite sides of the main body (11) of a base metal (10) of a blade (1), wherein the each face includes a plurality of first grooves (15) and second grooves (16) extending radially and in a curved manner, facing opposite to each other. A plurality of cutting tips (20) are bonded to the blade (1) around an outer circumferential periphery of the base metal (10), where each of the cutting tips (20) includes a rake face (21) that has a surface roughness Rz of 1 to 3.4 µm.