Thread Cutter with Segmented Cutting Edges
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Solution Overview
Problem
Existing thread cutting methods require high forces due to simultaneous contact of multiple cutting edges with the projection, leading to significant force peaks at the beginning of the cutting process.
Innovation Solution
A thread cutter design with axially extending longitudinal recesses and radially outward cutting edges, where cutting edges are offset in the circumferential direction, allowing only one or a few edges to initially engage, reducing the force required by distributing the load and avoiding simultaneous contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple cutting edges simultaneously contact the projection during thread cutting, then the thread can be cut in a single revolution, but very high force is required leading to significant force peaks
Solution Approach 1:
The set of cutting edges is divided into multiple groups arranged at different circumferential positions. During rotation, these groups engage the projection sequentially rather than simultaneously, segmenting the total cutting force into smaller portions applied at different times. This maintains high productivity through multiple cutting edges while reducing peak force requirements.
Solution Approach 2:
The cutting edges are arranged to engage the projection in a periodic sequence during rotation, with each group of cutting edges taking turns to contact and cut the projection. This periodic engagement pattern distributes the force demand over time, avoiding simultaneous contact of all cutting edges while maintaining continuous cutting action.
2Force
If cutting edges are offset in the circumferential direction, then force peaks are reduced by distributing load, but the tool structure becomes more complex
Solution Approach 1:
The cutting edges are segmented into multiple groups positioned at different circumferential locations around the tool. This segmentation allows the cutting load to be distributed across different spatial positions, reducing the maximum force required at any single moment while maintaining a relatively simple overall tool structure.
Solution Approach 2:
Instead of arranging all cutting edges in a single radial plane, the invention distributes them across the circumferential dimension. This dimensional redistribution of cutting edges allows load sharing and force reduction while keeping the tool body structure straightforward and manufacturable.
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
Significantly lowers the maximum force needed to cut a thread by reducing initial force peaks and maintaining a more even force increase throughout the cutting process.
Implementation Method 1
When the cutting tool is rotated by a maximum of 360° to form the entire internal thread in the projection, the cutting edges successively penetrate the projection as the tap is rotated. This offers the advantage that initially only one or a few cutting edges rest against the projection and cut into it.
Data Source
AI summary
The method involves inserting a thread cutter (10) which has an axially longitudinal recess (22), where radially outwardly projecting cutting edges adjoin with cutting edges (24,24a,24b) in a circumferential direction. Multiple successively located cutting edges are provided in the longitudinal direction in the longitudinal recess. The cutting edges are inserted into a groove upon introduction of the thread cutter. An independent claim is included for a combination of a base body with a receptacle and a thread cutter.