Double-Action Extrusion Press Mandrel Positioning
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Solution Overview
Problem
Conventional double-action extrusion presses experience movement deviations of the mandrel during extrusion due to mechanical delays in hydraulic pilot valve control, requiring frequent adjustments in stop position and fluid pressure to maintain the mandrel's position at the die bearing part.
Innovation Solution
The double-action extrusion press synchronizes the pressure receiving areas of cylinder chambers and the rod-side chamber of the piercer cylinder through a hydraulic pipeline, allowing for precise control of the mandrel's position by matching the fluid discharge from container cylinders with the piercer cylinder's rod-side chamber, eliminating the need for continuous pressure adjustments and enhancing positional precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a hydraulic pilot valve with mechanical stop control is used to hold the mandrel position, then the mandrel can be positioned at a predetermined stop position, but control delay occurs causing the mandrel to move back and forth by several millimeters
Solution Approach 1:
The patent replaces the mechanical pilot valve control system with a direct hydraulic control system. Instead of using a mechanical stop to activate a pilot valve that then controls the main valve, the system directly controls the main hydraulic valve through electrical signals or direct hydraulic actuation, eliminating the mechanical transmission delay and spool movement time that caused the several millimeter position deviations.
Solution Approach 2:
The patent introduces a pressure receiving area that directly receives hydraulic pressure from the main cylinder to control the pilot valve, eliminating the need for a separate pilot valve mechanism. This direct pressure transmission eliminates the control delay caused by mechanical pilot valve spool movement while maintaining precise mandrel position control.
2Measurement precision
If the stop position and fluid pressure are adjusted frequently to maintain mandrel position, then positional accuracy can be maintained, but operational complexity and time consumption increase
Solution Approach 1:
The patent implements a self-regulating hydraulic control system where the pressure receiving area automatically adjusts to maintain mandrel position without requiring manual intervention. The system self-corrects position deviations by directly responding to pressure changes, eliminating the need for operators to frequently adjust stop positions or fluid pressure settings.
Solution Approach 2:
The patent employs a feedback mechanism where the hydraulic pressure from the main cylinder directly influences the pilot valve or main valve through the pressure receiving area, creating a closed-loop control system that automatically maintains mandrel position accuracy without requiring manual adjustments.
3Reliability
If a mechanical stop and connecting rod system is used to control the pilot valve, then the mandrel position can be held, but device complexity increases due to additional mechanical components
Solution Approach 1:
The patent extracts and eliminates the complex mechanical pilot valve mechanism, stop, and connecting rod system from the control chain. By using direct hydraulic control or a simplified pressure receiving area, the system maintains position holding capability while removing unnecessary mechanical components that increased device complexity.
Solution Approach 2:
The patent replaces the mechanical control system (stop and connecting rod) with a hydraulic control system using a pressure receiving area that directly responds to hydraulic pressure. This substitution of mechanical components with hydraulic components simplifies the control mechanism while maintaining or improving position holding reliability.
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 configuration maintains the mandrel's position with improved precision and operability, reducing the need for frequent adjustments during changes in extrusion speed and eliminating deviations, thereby enhancing the overall control and efficiency of the extrusion process.
Implementation Method 1
the cylinder chambers at the sides for discharging working fluid from the container cylinders and a rod side of the piercer cylinder are connected by a hydraulic pipeline to be communicated with each other
Data Source
AI summary
A double-action extrusion press obtains a tubular product, wherein the pressure-receiving surface area of a cylinder chamber on the side from which hydraulic oil is discharged from a container cylinder and the pressure-receiving surface area on the rod-side chamber of a piercer cylinder are set to be the same when a container moves in the extrusion direction, and the cylinder chamber on the side from which hydraulic oil is discharged from the container cylinder and the rod-side chamber of the piercer cylinder are connected by an oil pressure conduit and are in communication with each other when a billet is extruded from the extrusion stem after piercing has been completed.