Continuous Mandrel Bar Extrusion for Smaller Billet Tubing
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Solution Overview
Problem
Conventional extrusion processes for manufacturing metal tubing require large billets and extensive machinery, leading to high start-up and maintenance costs, as well as manufacturing inefficiencies due to the need for continuous start-up and shut-down of equipment for each billet, limiting the production capacity and causing system component wear.
Innovation Solution
A continuous extrusion method that allows for the use of smaller billets by continuously loading and extruding multiple billets through a rotating die, utilizing a mandrel bar with gripping and cooling elements to secure and heat the billets, and a quenching system to cool the extruded material, reducing equipment size and operational costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If large billets are used in conventional extrusion processes, then the production of metal tubing is achieved, but the equipment size and manufacturing cost increase significantly
Solution Approach 1:
The continuous extrusion process divides the metal stock into discrete billets that are fed sequentially through the extrusion press. Each billet is processed individually but continuously, eliminating the need for a single large billet and corresponding large-scale equipment. The segmentation of the feeding mechanism into multiple stations allows smaller, more manageable equipment dimensions.
2Productivity
If conventional extrusion processes are used with separate billets, then metal tubing is produced, but continuous operation is interrupted requiring frequent start-up and shut-down
Solution Approach 1:
The extrusion press operates continuously with multiple billets fed in sequence through a continuous feeding mechanism. The press maintains constant operation without interruption, as each billet is automatically positioned and extruded in succession. This eliminates the repeated start-up and shut-down cycles of conventional processes, maintaining continuous useful action throughout the production run.
3Productivity
If multiple separate billets are processed individually, then metal tubing is produced, but system component wear increases due to constant start-up and shut-down
Solution Approach 1:
The continuous feeding mechanism with multiple billets eliminates repeated start-up and shut-down cycles, keeping the extrusion press in constant operation. This continuous operation significantly reduces mechanical stress and wear on system components such as the press ram, die, and feeding mechanisms, thereby improving reliability and reducing maintenance requirements.
4Quantity of substance
If large-scale machinery is used for processing large billets, then metal tubing is produced, but manufacturing cost and maintenance cost increase
Solution Approach 1:
The process segments the metal stock into smaller discrete billets that can be handled by smaller, less expensive equipment. The feeding mechanism is divided into multiple stations that can be manufactured independently at lower cost. This segmentation allows the use of smaller-scale machinery with reduced manufacturing and maintenance costs while maintaining production efficiency.
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 enables more efficient production of seamless metal tubing by reducing equipment size, lowering costs, and minimizing wear on system components, while maintaining high production capacity and quality.
Implementation Method 1
The rotating die heats the billet as the billet advances through the rotating die
Implementation Method 2
transporting the first billet along the mandrel bar and through cooling elements that clamp to the mandrel bar and deliver cooling fluid to the mandrel bar
Implementation Method 3
a quenching system to cool the extruded material
Data Source
AI summary
One or more hollow billets are loaded onto an elongate mandrel bar for extrusion. The billets are transported along the mandrel bar to a rotating die. The billets are transported through fluid clamps, which engage the mandrel bar and provide cooling fluid to the mandrel bar tip, and through mandrel grips, which engage the mandrel bar and prevent the mandrel bar from rotating. One or more press-rams advance the billets through a centering insert and into the rotating die. A quench assembly is provided at an extrusion end of the extrusion press to quench the extruded material. A programmable logic controller may be provided to control, at least in part, operations of the extrusion press system.