Threading Tool Cutting Edge Geometry for Continuous Groove Formation
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Solution Overview
Problem
Conventional threading tools with a front end bite outer diameter smaller than the thread crest and root inner diameter require excessive rotational movement to form a thread of predetermined width and depth, leading to inefficient processing time due to the need for separate rough and finish cutting steps.
Innovation Solution
A threading tool with a cutting edge portion featuring a primary cutting edge and two secondary cutting edges, where the secondary cutting edges are shorter and slanted at an obtuse angle, allowing for wider material removal and continuous groove formation without the need for finish cutting, reducing the number of tool movements and processing time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the outer diameter of the front end of the bite is made smaller than the inner diameter of the corner part of the crest and the root of the thread, then the threading tool can form threads with smooth surfaces, but the cutting amount scraped off per rotation becomes less, requiring more rotational movements and increasing processing time
Solution Approach 1:
The cutting edge portion is divided into multiple functional edges: a primary cutting edge for rough cutting with large cutting amount, and secondary cutting edges for finish cutting with smaller cutting amounts. This segmentation allows the tool to perform both rough and finish cutting in one operation, eliminating the need for separate finish cutting steps and reducing total processing time while maintaining smooth surface quality
Solution Approach 2:
The cutting edge portion is designed to perform multiple functions simultaneously - the primary cutting edge removes material efficiently for rapid material removal, while the secondary cutting edges provide surface finishing. This multi-functionality allows a single tool configuration to complete both rough cutting and finish cutting operations that previously required separate tools or multiple passes
2Quantity of substance
If the front end of the bite with small outer diameter is used for rough cutting, then the thread groove can be formed, but separate finish cutting is required afterward, increasing the number of tool movements
Solution Approach 1:
The invention merges the rough cutting function and finish cutting function into a single cutting edge portion with multiple edges. The primary cutting edge performs rough cutting while the secondary cutting edges perform finish cutting, combining what were previously separate operations into one integrated tool element, thereby reducing the number of discrete cutting steps and tool movements required
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
The tool efficiently forms thread grooves with reduced movement of the tool main body, eliminating the need for separate finish cutting and enabling faster processing by utilizing the primary and secondary cutting edges to create smooth, wide groove surfaces.
Implementation Method 1
a cutting edge portion, which is provided on a tip portion of the tool main body and has a rake face and a flank face
Data Source
AI summary
A threading tool includes: a tool main body; and a cutting edge portion, which is provided on a tip portion of the tool main body and has a rake face and a flank face. The cutting edge portion includes: a primary cutting edge extending in a tooth width direction of the cutting edge portion; two corner edges, one and other of which are provided on one and other of both ends of the primary cutting edge, respectively, and are in a convex curve shape; and two secondary cutting edges, one and other of which extend from the one and the other of the two corner edges to a rear end side of the cutting edge portion, respectively. Two secondary cutting edges are shorter than the primary cutting edge. At least one of the two secondary edges is slanted to a direction intersecting the primary cutting edge in an obtuse angle.