Rotatable Cutting Tool with Oblique Edges for Thread Trimming
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Solution Overview
Problem
Existing cutting tools, such as screw dies, are inconvenient to use for trimming damaged threads or removing dirt from screws due to the risk of cutting unintended threads and alignment issues.
Innovation Solution
A cutting tool with a rotatable body featuring an annular cutting end that includes obliquely extending cutting edges and slots for efficient trimming of threaded fasteners, allowing for precise cutting without truncating threads and easy removal of trimmed pieces through centrifugal force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a screw die is used to trim damaged threads or remove dirt from screws, then the cutting ability is improved, but the risk of cutting unintended threads increases and alignment becomes difficult
Solution Approach 1:
The cutting tool is segmented into distinct functional zones: a receiving space for the workpiece, oblique cutting edges for trimming, and slots for chip evacuation. This segmentation allows each zone to perform its specific function independently, improving both cutting accuracy and ease of operation.
Solution Approach 2:
Instead of using a traditional screw die that requires alignment with the screw axis, this invention inverts the approach by having the workpiece fit into a receiving space with cutting edges that engage automatically. The cutting action occurs as the workpiece is inserted, eliminating alignment difficulties while maintaining cutting reliability.
2Productivity
If a traditional cutting tool is used, then cutting action is achieved, but trimmed pieces cannot be easily removed
Solution Approach 1:
The invention extracts the chip removal function by incorporating slots that extend from the inner periphery through the outer periphery of the cutting end. These slots actively take out trimmed pieces from the cutting zone and evacuate them, improving productivity while ease of operation.
Solution Approach 2:
The cutting tool performs self-service by using the rotational motion generated during trimming to automatically evacuate chips through the slots. The centrifugal force generated during rotation self-propels the chip removal process without requiring additional mechanisms, thereby improving both productivity and ease of operation.
3Manufacturing precision
If oblique cutting edges are used, then precise cutting is achieved without truncating threads, but the tool structure becomes more complex
Solution Approach 1:
The cutting edges are designed with local quality by positioning them at specific angles and locations within the receiving space. The oblique orientation of cutting edges at different positions allows precise control over the cutting action, ensuring threads are trimmed without truncation while maintaining relatively simple overall tool structure.
Solution Approach 2:
The invention transitions from conventional linear cutting edges to oblique cutting edges that extend in multiple dimensions within the receiving space. This dimensional change allows the cutting edges to engage the workpiece at optimal angles for precise thread trimming while integrating smoothly into the overall tool geometry, balancing manufacturing precision with structural simplicity.
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
Enables effective trimming of threaded fasteners without reducing the number of threads and facilitates easy disposal of trimmed pieces, addressing the alignment and truncation issues of traditional tools.
Implementation Method 1
allowing for precise cutting without truncating threads and easy removal of trimmed pieces through centrifugal force
Data Source
AI summary
A cutting tool includes a body including a connecting end, a cutting end which includes a space for receiving the work piece, at least one projection with a ridge defining at least one cutting edge for cutting the work piece, and at least one slot for allowing pieces trimmed from the workpiece to exit from the body. The space has a top and a bottom and tapers outwardly from the top to the bottom. The at least one cutting edge has a first end adjacent to the top of the space and a second end adjacent to the bottom of the space and extends from the first end to the second end obliquely. The body is rotatable about a first axis, and the first axis extends longitudinally between the first and second ends of the body.