Thread Forming Tap With Variable Relief Lobes
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Solution Overview
Problem
Existing thread forming taps face limitations in design and architecture, particularly in achieving optimal thread formation with varying relief types and rates, which can affect tool performance and efficiency in cold forming applications.
Innovation Solution
The development of thread forming taps with a helical thread and longitudinally-extending linear grooves that form lobes, where adjacent lobes differ in relief type and/or relief rate, enhancing the tap's ability to form high-quality internal threads with improved tool life and reduced breakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional thread forming taps with uniform relief are used, then the design is simple, but the thread formation quality and tool life are limited
Solution Approach 1:
The patent applies local quality by varying the relief type and/or relief rate across different lobes of the helical thread. Each lobe can have customized relief characteristics tailored to specific threading requirements, allowing optimal thread formation quality in different regions of the workpiece while managing the complexity through a systematic multi-lobe structure.
2Manufacturing precision
If forming taps are used for materials with low tensile strengths, then high quality surface finish is achieved, but tool breakage risk increases
Solution Approach 1:
The patent employs parameter changes by varying the relief type and relief rate across different lobes. This allows optimization of the forming tap's interaction with materials of low tensile strength, distributing stress more evenly and reducing the risk of tool breakage while maintaining high surface finish quality through controlled material displacement.
3Productivity
If adjacent lobes have different relief characteristics, then thread formation is optimized, but manufacturing complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the helical thread into multiple lobes, where each lobe can have different relief characteristics. This segmentation allows independent optimization of each lobe for specific threading functions, improving overall thread formation efficiency while making the manufacturing process more manageable through modular design elements.
Data Source
AI summary
In one aspect, thread forming taps are described herein. In some embodiments a thread forming tap comprises a shank disposed at a first end adapted to engage a tool holder and an elongated working portion disposed at a second end. The working portion comprises at least one helical thread and a plurality of longitudinally-extending linear grooves. The longitudinally-extending linear grooves intersect the helical thread forming a plurality of lobes, wherein adjacent lobes differ from one another in relief type and/or relief rate.