Floating Rolling Head for Conical Pipe Threads

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Solution Overview

Problem

Current pipe thread rolling processes are time-consuming, inconvenient for on-site processing, and prone to material damage due to high axial punching pressures, resulting in inner hole narrowing that exceeds standard allowances, affecting fluid transport stability and safety.

Innovation Solution

A rolling head with floating connections between rolling wheels and a seat, allowing axial and radial movement, which omits the axial punching step and uses a cylindrical pipe blank with a standard outside diameter to form conical pipe threads directly, aligning with national and international standards.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If axial punching conical surface is performed using large equipment before pipe thread rolling, then pipe thread rolling can be completed, but the processing time increases and on-site processing becomes inconvenient

Engineering Contradiction:

Improvepipe thread rolling completenessVSAvoidprocessing time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The invention merges the conical surface formation and pipe thread rolling operations into a single integrated rolling head assembly. The rolling wheels are designed with specific geometries that simultaneously create the conical surface and roll the pipe threads in one continuous motion, eliminating the need for separate axial punching equipment and operations.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The rolling head assembly performs multiple functions: it forms the conical surface, rolls the pipe threads, and controls the deformation process all through a single device. This multi-functional design replaces the need for separate large punching equipment and rolling machinery, enabling both operations to be completed efficiently in one setup.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If axial punching conical surface is performed with large equipment, then pipe thread rolling can proceed, but pipe materials especially welded seam materials are vulnerable to damage

Engineering Contradiction:

Improvepipe thread rolling feasibilityVSAvoidmaterial damage

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The invention converts the potentially harmful concentrated axial punching force into a beneficial distributed rolling pressure. By using rolling wheels that apply force progressively across the pipe surface, the process transforms what would be a damaging impact load into a controlled compressive stress that shapes the material without causing damage to the pipe body or welded seams.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The rolling process inherently provides cushioning by progressively deforming the material through controlled plastic flow. The rolling wheels distribute the forming force over time and area, preventing sudden stress concentrations that could damage the pipe material, especially vulnerable welded seam areas.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Ease of manufacture

If steel pipe standard outside diameter is used for rolling cylindrical pipe blank, then cutting pipe thread technology is maintained, but the outside diameter is too large causing excessive inner hole narrowing

Engineering Contradiction:

Improvecompatibility with cutting technologyVSAvoidinner hole narrowing control

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The invention changes the critical parameter of pipe blank outside diameter from the standard cutting pipe diameter to a specifically calculated smaller diameter. This parameter change ensures that when the pipe undergoes rolling deformation to form conical threads, the final inside diameter narrowing remains within acceptable limits for fluid transport stability.

Inventive Principle:

Principle #35Parameter changes

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

This method simplifies the pipe thread rolling process, reduces material damage, ensures inner hole narrowing within standard limits, and enhances fluid transport stability and safety, while reducing steel usage and costs.

Implementation Method 1

rolling directly on a cylindrical pipe blank to form scaled conical pipe threads

Methodology Applied

Scientific EffectPlastic deformation: Plasticity

Implementation Method 2

an axial movement space is present in a direction along the rolling wheel axle of the rolling wheel body relative to the rolling wheel seat

Methodology Applied

Scientific EffectMechanical movement:

Data Source

PatentUS10464119B2Rolling head for rolling pipe threads, apparatus and pipe column blank machined by the apparatus

Publication Date: 2019.11.05 SHANGHAI PAN CHINA FASTENING SYST

AI summary

A rolling head for rolling pipe threads includes at least two rolling wheels and a rolling wheel seat for positioning the rolling wheels, in which the rolling wheel includes a rolling wheel body and a rolling wheel axle, the rolling wheel body includes a rolling wheel pipe thread forming portion, an axial movement space is present in a direction along the rolling wheel axle of the rolling wheel relative to the rolling wheel seat, an axial distance of the axial movement space is 0.5 thread pitch to 1 thread pitch of a corresponding thread of the rolling wheel pipe thread forming portion.