Tangential Thread Rolling Head Asymmetric Claw Alignment
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Solution Overview
Problem
Existing tangential thread rolling heads face issues with incorrect assembly of thread rolls, leading to potential damage during machining due to the lack of a reliable method to ensure each thread roll is inserted into the correct rolling head arm, resulting in increased assembly effort and risk of misalignment.
Innovation Solution
The design of the thread rolls and pinions features unique claw configurations that allow interaction only with their assigned pinion, ensuring each thread roll can be inserted into the correct rolling head arm in a single defined rotational position, preventing incorrect assembly through complementary claw designs and stop surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thread rolls are marked to indicate assignment to specific rolling head arms, then incorrect assembly can be prevented, but assembly effort and complexity increase
Solution Approach 1:
The patent applies asymmetry by designing the claws of thread rolls and pinions with non-symmetric geometries that are complementary to each other. Each thread roll has claws with specific shapes that only match the corresponding pinion's claw geometry, creating an asymmetric fit that prevents incorrect assembly without requiring additional markings or complex procedures.
2Reliability
If thread rolls are designed with unique claw configurations for each pinion, then unambiguous assignment is ensured, but manufacturing complexity increases
Solution Approach 1:
The patent applies local quality by making only the claw regions of the thread rolls and pinions unique and differentiated, while the rest of the components can be manufactured using standard processes. The asymmetric claw geometries are localized features that provide the necessary identification and matching functionality without requiring the entire components to be custom-manufactured.
3Manufacturing precision
If the claws of thread rolls and pinions are designed to interact in a single defined rotational position, then correct alignment is ensured, but the design complexity increases
Solution Approach 1:
The patent uses asymmetric claw geometries where the shape, size, and orientation of claws on thread rolls are specifically designed to complement only the corresponding pinion's claws in a single rotational position. This asymmetric design inherently enforces correct rotational alignment when the components are assembled, as any other rotational position would result in mismatched claw geometries that prevent proper engagement.
Data Source
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AI summary
The invention relates to a tangential thread rolling head comprising two fork-like rolling head arms each rotatably coupled with a thread roll by an axle. The thread rolls respectively engage with a pinion and can be pushed laterally into an assembled position into the rolling head arms before installation of axles, in which one of the axles can be pushed into a bearing bore hole of the thread rolls. The thread rolls and the pinions have interacting catches that are configured such that each of the thread rolls can only be pushed laterally into the assembled position in a single defined rotary position.