Pipe Elbow Manufacturing via Segmented Machining and Welding
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Solution Overview
Problem
Existing methods for manufacturing larger diameter pipe fittings are costly due to the need for large molding machines and molds, and economies of scale are low, making them inefficient.
Innovation Solution
A method involving cutting and machining polyethylene pipe stock to form pipe elbows with specific arcuate interior and exterior surfaces, allowing for welding and assembly of fittings that maintain the original pipe's outer diameter surface, enabling efficient production of high-pressure capable fittings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If large molding machines and molds are used to manufacture large diameter pipe fittings, then the fittings can be produced, but the manufacturing cost becomes relatively expensive and economies of scale are low
Solution Approach 1:
The pipe fitting is segmented into multiple sections that can be manufactured separately using standard-sized molding machines and then assembled together. This allows the use of smaller, more economical molding equipment while still producing large diameter fittings, thereby reducing manufacturing costs and improving economies of scale.
Solution Approach 2:
Multiple pipe fitting sections are nested or joined together to form the complete large diameter fitting. The sections can be manufactured independently using standard equipment and then assembled through welding or other joining methods, eliminating the need for expensive large-capacity molding machines.
2Ease of manufacture
If pipe fittings are assembled from cut and machined pipe stock, then manufacturing cost may be reduced, but the process complexity increases
Solution Approach 1:
The pipe sections are pre-formed using molding machines to create near-final shapes with minimal material removal required. This preliminary forming action reduces the complexity of subsequent machining and assembly operations compared to starting with solid pipe stock that requires extensive cutting and shaping.
Solution Approach 2:
The manufacturing process changes from mechanical cutting and machining of pipe stock to a combination of molding and minimal finishing operations. This parameter change in the manufacturing approach reduces both cost and process complexity by utilizing material forming rather than material removal.
Data Source
AI summary
A pipe elbow has a first end and a second end off parallel to the first end. An interior surface of the pipe elbow has a centerline having an arcuate portion. A circular cylindrical exterior surface portion of the pipe elbow surrounds the arcuate portion of the centerline.