Thin Tipped Circular Saw Blade Grooves for Chipping Control
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Solution Overview
Problem
Circular saw blades with thin blade thicknesses experience chipping due to frictional heat when cutting at high feed rates, leading to reduced durability and uneven cutting surfaces.
Innovation Solution
The design features a circular saw blade with alternately arranged first and second tips, each having a groove with a pair of chamfers and inclined surfaces, where the sum of the distances between the groove bottoms is minimized to reduce lateral displacement and frictional heat, and the groove end angles are set between 60° to 85° to prevent chipping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If the blade thickness is reduced to 2 mm or less, then the amount of cutting chips is reduced and cutting resistance is lowered, but lateral displacement of tips increases and frictional heat causes chipping
Solution Approach 1:
The tip is segmented into multiple regions by forming grooves that divide the cutting edge into several segments. This segmentation reduces the continuous contact area between the tip and workpiece, thereby reducing frictional heat generation and preventing chipping while maintaining thin blade thickness
Solution Approach 2:
Different regions of the tip are given different properties through asymmetric groove positioning. The groove is positioned closer to one side of the tip, creating local variations in heat distribution and stress concentration that prevent uniform thermal expansion and chipping
2Productivity
If the feed rate is increased to several times the normal rate, then productivity is improved, but frictional heat increases and chipping occurs
Solution Approach 1:
The cutting edge is divided into multiple segments by grooves, which reduces the continuous frictional contact area. This allows higher feed rates to be used without generating excessive frictional heat that would cause chipping
Solution Approach 2:
The asymmetric groove positioning creates periodic variations in heat generation and tip displacement during rotation. This periodic action prevents sustained thermal buildup at any single location, enabling higher feed rates without chipping
3Power
If grooves are formed in tips, then cutting resistance and chip volume are reduced, but lateral displacement increases causing friction and chipping
Solution Approach 1:
The groove is positioned asymmetrically within the tip, closer to one side rather than at the center. This asymmetric positioning creates a specific lateral displacement pattern that reduces frictional contact with the workpiece while maintaining the power-reducing benefits of groove segmentation
Solution Approach 2:
The position of the groove within the tip is optimized to specific parameters that balance lateral displacement reduction with cutting power reduction. By adjusting the groove position parameter, both objectives are 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 configuration reduces lateral displacement, suppresses frictional heat generation, and enhances the durability and longevity of the cutting tips, maintaining a satisfactory cut surface and reducing chipping occurrences.
Implementation Method 1
friction is generated between side faces of tips and the workpiece
Implementation Method 2
the tips to be laterally displaced (vibrate)
Implementation Method 3
Cycling of thermal expansion and thermal contraction of the tips occurs at locations where the frictional heat is generated
Implementation Method 4
frictional heat generated between the tips and the workpiece
Data Source
AI summary
A circular saw blade includes a disc-shaped base metal having an outer diameter of 200 mm to 500 mm, and a plurality of first tips, and a plurality of second tips alternately arranged along an outer circumference of the base metal. The circular saw blade has a blade thickness about 0.8 mm to 2.0 mm. The first tips and the second tips have cutting edges and a pair of chamfers at both ends of the cutting edges. A first groove and a second groove are formed in a flank so as to extend in a circumferential direction of the cutting edges. The first groove includes a first groove bottom that is deepest in a radial direction at a position of a first distance from a thickness center in a first thickness direction. The second groove has a second groove bottom that is deepest in the radial direction at a position of a second distance from the thickness center in a second thickness direction opposite to the first thickness direction. A sum of the first distance and the second distance is about 0.35 mm or less.