Circular Saw Blade Local Thickness Variation for Noise Reduction
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Solution Overview
Problem
Conventional circular saw blades emit high noise levels due to air circulation in hollow spaces and resonance, which is not effectively reduced by existing noise-reduction methods that compromise chip evacuation and machine operation.
Innovation Solution
The design of a circular saw blade with a chip clearance volume less than the apparent volume of the chip, allowing for efficient chip evacuation without blocking, and a blade geometry that minimizes noise by reducing hollow spaces, using a specific expansion coefficient and optimizing the blade's profile to maintain full-speed operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the hollow spaces upstream of each tooth are eliminated to reduce noise, then noise level is reduced, but chip evacuation is blocked causing machine overheating and tooth detachment
Solution Approach 1:
The blade body is designed with non-uniform thickness where the local thickness varies along the circumference. Specifically, the thickness is reduced in regions corresponding to the upstream spaces of teeth to eliminate hollow spaces and reduce noise, while maintaining sufficient thickness in other regions to ensure proper chip evacuation. This local variation in thickness allows simultaneous achievement of noise reduction and reliable chip evacuation without compromising blade integrity.
2Object-affected harmful factors
If conventional noise reduction methods are applied, then noise is reduced, but chip evacuation is compromised leading to machine blockage
Solution Approach 1:
The blade design implements local thickness variations that create specific geometric features: reduced thickness zones upstream of teeth eliminate noise-generating hollow spaces, while maintained or increased thickness zones ensure adequate chip evacuation channels. This localized differentiation allows the blade to operate at full speed with optimal chip evacuation while achieving noise levels below 70 dB.
Solution Approach 2:
The invention changes the geometric parameters of the blade body by varying the thickness along the circumference. The thickness parameter is optimized to create a balance between noise reduction (requiring minimal hollow spaces) and chip evacuation (requiring sufficient clearance volume). This parameter optimization enables full-speed operation without compromising either noise level or chip evacuation capability.
3Object-affected harmful factors
If the blade thickness is reduced to eliminate hollow spaces, then noise is reduced, but blade strength is compromised
Solution Approach 1:
The blade body thickness is varied locally along the circumference rather than uniformly reduced. The thickness is minimized only in specific regions where hollow spaces would form upstream of teeth, while maintaining adequate thickness in regions critical for structural strength and chip evacuation. This selective thinning approach reduces noise without compromising overall blade integrity.
Data Source
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AI summary
The invention relates to a device for sawing a material, comprising at least one circular saw blade consisting of: - a blade body (1) having the shape of a disc; - a plurality n (n>1) of teeth (2) inserted into the periphery of the blade body (1) so as to be distributed around the circumference of the disc, each tooth (2) generating a chip from the material being machined; a cutout (6) for chip evacuation being provided in the periphery of the blade body (1) at the level of each tooth (2) and incorporating a seat to which the tooth (2) is welded. This device is characterized in that, for at least one tooth, said cutout (6) defines a chip evacuation volume (VDGC) which is less than the apparent volume of the chip (V) generated by a tooth (2).