Thin Tipped Circular Saw Blade Groove Geometry for Chip Splitting
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Solution Overview
Problem
Conventional circular saw blades with a blade thickness less than 2.0 mm suffer from poor durability and are prone to breaking due to insufficient chipping resistance, leading to scratches on workpiece surfaces during cutting.
Innovation Solution
A tipped circular saw blade with a blade thickness of 0.8 mm to 1.1 mm, featuring a disc-shaped base metal with tips that protrude radially, each having a flank, chamfer, and a groove with a width of 0.20 mm to 0.30 mm and a depth of 0.10 mm to 0.15 mm, designed to enhance chipping resistance and prevent scratches by effectively splitting cutting chips.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the circular saw blade thickness is reduced below 2.0 mm, then the amount of cutting chips is reduced and workpiece utilization is improved, but the durability of the circular saw blade deteriorates and it breaks at the groove for splitting cutting chips
Solution Approach 1:
The patent changes the geometric parameters of the groove, specifically setting the groove width to 0.20 mm to 0.30 mm and the groove depth to 0.10 mm to 0.15 mm. These parameter optimizations allow the groove to effectively split cutting chips while maintaining sufficient material around the groove to prevent blade breakage, thus resolving the contradiction between reducing chip quantity and maintaining blade durability.
Solution Approach 2:
The patent employs a curved groove bottom configuration instead of sharp corners. The curved bottom radius is optimized to distribute stress evenly during cutting operations, preventing stress concentration that would lead to groove breakage. This curvature design allows the blade to be thinner while maintaining reliability at the groove location.
2Reliability
If the groove width is increased to improve chip splitting, then chipping resistance is improved, but the effective length of the cutting edge is reduced
Solution Approach 1:
The patent optimizes the groove width parameter to a specific range of 0.20 mm to 0.30 mm, which is sufficient to split cutting chips effectively while minimizing the reduction in cutting edge length. This precise parameter control resolves the contradiction between chip splitting capability and cutting edge effectiveness.
Solution Approach 2:
The groove depth is limited to 0.10 mm to 0.15 mm, which is partial penetration into the tip rather than through-and-through. This partial action provides sufficient chip splitting while preserving most of the cutting edge length, avoiding the excessive groove depth that would compromise cutting edge effectiveness.
3Productivity
If the blade thickness is reduced to enhance workpiece effectiveness, then material usage is improved, but the circular saw blade becomes prone to breaking at the groove
Solution Approach 1:
The curved groove bottom with optimized radius distributes mechanical stresses evenly during cutting, preventing stress concentration that would cause groove breakage in thinner blades. This curvature allows the blade to be thinner (0.8 mm to 1.1 mm) while maintaining strength at the groove location.
Solution Approach 2:
The patent optimizes multiple parameters simultaneously: groove width (0.20-0.30 mm), groove depth (0.10-0.15 mm), and curved bottom radius, to achieve the right balance between chip splitting capability and structural integrity in thin-blade configurations.
Data Source
Figure 1
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Figure 3~4
AI summary
A tipped circular saw blade (1) includes a disk-shaped base metal (2), and tips (4) joined to the base metal (2) so as to protrude in a radial direction from an outer periphery of the base metal (2). An outer diameter of the circular saw blade (1) is 280 mm to 500 mm and blade thickness of the tips is 0.8 mm to 1.1 mm. A tip (4) has a flank (4a) oriented outwardly in the radial direction, a side face (4b) located on one of both ends in the thickness direction of the flank (4a), and a chamfer (4c) defined between the flank (4a) and the side face (4b) wherein the chamfer (4c) has a chamfered angle (θ) with respect of the flank (4a). Further, each of the tips (4) includes a cutting edge (4d) located on one end of the flank (4a) in the circumferential direction, wherein the cutting edge (4d) is configured to cut the workpiece, and a groove (4f) formed on the flank (4a) so as to extend from the cutting edge (4d) in the circumferential direction. The width of the groove (4f) may be 0.20 mm to 0.30 mm.