Saw Blade Gullet Undercut for Chip Clearance and Insert Protection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing saw blades face challenges in efficiently cutting hard materials while protecting the cutting inserts from damage and ensuring adequate chip removal, particularly when machining operations require fewer teeth per inch.
Innovation Solution
The saw blade design incorporates material limiters and gullets with undercut portions, formed through stamping or other processes, to guide material away from cutting inserts and enhance chip removal, while using carbide inserts for durability and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fewer teeth per inch are used to increase cutting speed, then productivity improves, but chip removal becomes inadequate and insert damage increases
Solution Approach 1:
The gullet is segmented into multiple functional zones: an undercut portion with negative rake angle to break chips, a transition portion to redirect chips, and a clearance portion for chip storage. This segmentation allows each zone to perform a specific function in the chip breaking and removal process, enabling effective chip control with fewer teeth per inch.
Solution Approach 2:
The undercut portion acts as an intermediary element between the cutting insert and the chip flow path. By providing a negative rake angle surface, it mediates the chip breaking process, redirecting chips away from the insert and preventing damage while maintaining productivity with fewer teeth.
2Reliability
If material limiters are positioned closer to cutting inserts to protect them, then insert protection improves, but chip removal becomes restricted
Solution Approach 1:
The gullet is divided into distinct functional portions: the undercut portion for chip breaking, the transition portion for redirection, and the clearance portion for chip storage. This segmentation allows the material limiter to be positioned close to the insert for protection while the undercut portion effectively breaks chips and the clearance portion ensures adequate chip removal space.
Solution Approach 2:
The undercut portion introduces a dimensional change by creating a negative rake angle surface that extends below the horizontal plane. This three-dimensional feature allows chips to be broken and redirected away from the insert in a different spatial dimension, enabling close material limiter positioning without compromising chip removal.
3Ease of manufacture
If conventional gullet designs are used with fewer teeth per inch, then manufacturing simplicity is maintained, but chip breaking and removal become inadequate
Solution Approach 1:
The gullet is pre-formed with an undercut portion during the blank formation process, before cutting inserts are attached. This preliminary action creates the chip breaking geometry in advance, ensuring effective chip removal is built into the blade structure itself, enabling fewer teeth per inch to be used while maintaining manufacturing efficiency.
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
A saw blade includes a body and a plurality of cutting teeth formed on the body. Each cutting tooth includes a tip at a first end of the cutting tooth, a rake face extending from the tip toward the body, a relief face extending from the tip toward a second end of the cutting tooth and sloping toward the body, and a projection at the second end of the cutting tooth and sloping away from the body. The saw blade also includes a plurality of gullets formed on the body between the plurality of cutting teeth. Each gullet forms an undercut portion between the body and the projection of each cutting tooth.