Bimetallic Pipe Production Without Mandrel
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Solution Overview
Problem
Existing methods for producing corrosion-resistant bimetallic pipes are costly and inefficient, often requiring large-scale equipment and mandrels that limit pipe length and wall thickness, and are time-consuming due to processes like weld-deposit overlaying and drawing through a die.
Innovation Solution
A system and method that involves using an outer shell with a larger inner diameter than the inner shell, where the inner shell is inserted and the outer shell is reduced in diameter using a die or roller stands without a mandrel, allowing for secure engagement and efficient production of bimetallic pipes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional methods using large-scale equipment and mandrels are used to produce bimetallic pipes, then the pipes can be produced with secure engagement, but the equipment size and cost increase, and the pipe length is limited
Solution Approach 1:
The patent removes the mandrel from the drawing process entirely. Instead of using a mandrel to support the inner shell during drawing, the method draws the telescoped pipes through a die without any mandrel, eliminating the equipment complexity and cost associated with mandrels while still achieving secure engagement between the shells
Solution Approach 2:
The patent uses the nested configuration of the inner shell within the outer shell, telescoping one pipe inside the other, to create a self-supporting structure during the drawing process. The nested arrangement allows the pipes to be drawn through a die without requiring additional mandrel support
2Reliability
If weld-deposit overlaying is used to produce bimetallic pipes, then corrosion resistance is achieved, but the production time increases
Solution Approach 1:
The patent performs preliminary actions by pre-forming both the inner and outer shells with their complete corrosion-resistant properties before assembly. The shells are manufactured separately with their desired material properties already in place, eliminating the need for time-consuming weld-deposit overlaying operations after assembly
Solution Approach 2:
The patent uses composite materials by combining different metal shells with distinct properties - the inner shell made from corrosion-resistant material and the outer shell made from structural material. This composite construction achieves both corrosion resistance and structural integrity through material selection rather than through time-consuming deposit overlaying processes
3Manufacturing precision
If drawing process with mandrel is used, then dimensional control is improved, but the wall thickness capability is limited
Solution Approach 1:
The patent removes the mandrel constraint that limited wall thickness capability. By drawing the telescoped pipes through a die without a mandrel, the process can accommodate pipes with various wall thicknesses, including thicker walls that would not fit around a mandrel, while still maintaining dimensional control through the die
Solution Approach 2:
The patent changes the dimensional approach by drawing the pipes through a die in a different configuration - with the inner shell telescoped inside the outer shell rather than around a mandrel. This dimensional rearrangement allows the drawing process to accommodate greater wall thickness variations while maintaining dimensional control
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 approach reduces production costs and equipment size, enabling the efficient manufacture of longer, thicker bimetallic pipes with improved performance characteristics, such as better dimensional control and resistance to corrosive substances.
Implementation Method 1
The outer shell may be reduced to securely engage the inner shell by drawing the outer shell with the inner shell disposed therein through a die
Implementation Method 2
The method may then reduce the outer shell by sizing the outer shell with the inner shell disposed therein through at least one roller stand
Implementation Method 3
Some applications may include annealing the outer and inner shells after reducing the outer shell
Data Source
AI summary
The present invention involves a system and method for producing bimetallic pipe. In one embodiment of the present invention, the method includes inserting an inner shell into an outer shell and reducing the outer shell to securely engage the inner shell by drawing the outer shell and inner shell through a die without the use of a mandrel placed in the inner shell. In another embodiment of the present invention, the method includes inserting an inner shell into an outer shell and reducing the outer shell to securely engage the inner shell by sizing the outer shell using at least one roller stand.