Hydraulic Adjustable Die Assembly for Variable Extrusion Diameter
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Solution Overview
Problem
Existing die assemblies in extrusion processes lack the ability to adjust their diameter in response to force, resulting in fixed workpiece diameters, which limits versatility and efficiency in shaping metal and plastic products.
Innovation Solution
An adjustable diameter die assembly is developed, featuring a piston/cylinder combination that hydraulically actuates first and second rings to change the die's axial diameter, allowing for selective increase or decrease of the workpiece diameter based on applied force, with a precision of ±0.005 inches, and can be computer-controlled using sensor data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional fixed-diameter die is used, then the extrusion process is simple and reliable, but the workpiece diameter cannot be adjusted, reducing versatility and requiring multiple dies for different sizes
Solution Approach 1:
The die is divided into multiple segments or sections that can move relative to each other along the extrusion axis. These segments can be adjusted independently to change the internal diameter of the die, allowing a single die to produce multiple workpiece sizes. The segmentation enables dimensional adjustment without requiring complete die replacement.
Solution Approach 2:
The die transitions from a static fixed-diameter structure to a dynamic adjustable-diameter structure. The die segments are designed to move axially under controlled forces, enabling real-time or batch adjustment of the working diameter during the extrusion process, thereby improving adaptability while maintaining operational simplicity.
2Productivity
If the die diameter is fixed, then manufacturing and operation are simple, but productivity decreases due to inability to adapt to varying production requirements
Solution Approach 1:
The die assembly incorporates a self-adjusting mechanism where the die segments automatically position themselves based on applied forces or internal actuation systems. This reduces the need for complex manual adjustment operations while enabling quick diameter changes, thereby improving productivity without significantly complicating ease of operation.
3Loss of time
If multiple fixed-diameter dies are used to produce different workpiece sizes, then each die is simple and reliable, but device complexity increases and time is lost changing dies
Solution Approach 1:
The die assembly is designed as a universal tool that can produce multiple workpiece diameters through internal adjustment mechanisms. Instead of requiring separate dedicated dies for each size, a single multi-functional die replaces multiple single-purpose dies, eliminating die change time and reducing the total number of die assemblies needed in the system.
4Manufacturing precision
If the die structure is simplified for easy operation, then ease of operation is improved, but manufacturing precision may suffer due to lack of adjustment control
Solution Approach 1:
The die adjustment mechanism incorporates feedback systems such as sensors, indicators, or control systems that monitor the position of die segments and provide real-time information about the current diameter setting. This feedback ensures precise and repeatable diameter adjustments while maintaining ease of operation through intuitive control interfaces that guide the operator to the correct settings.
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
Enables dynamic adjustment of workpiece diameter during extrusion, enhancing the versatility and precision of metal and plastic extrusion processes by allowing the die to adapt to varying forces, improving the shape and size consistency of extruded products.
Implementation Method 1
a piston/cylinder combination operatively coupled to the adjustable die that, when actuated, selectively causes (1) a tightening, of the first and second rings toward one another such that the axial diameter is decreased or (2) a relaxing of the first and second rings away from one another such that the axial diameter is increased
Implementation Method 2
a cooling tank having a volume of water for cooling the workpiece
Data Source
AI summary
An adjustable diameter die assembly for extruding a heated and malleable workpiece being forcefully moved downstream includes a die having a first ring and a second ring spaced apart from the first ring, the die having an axial portion extending intermediate the first and second rings that defines a throughbore having an axial diameter that is adjustable. The adjustable diameter die assembly includes a piston/cylinder combination operatively coupled to the die that, when actuated, causes (1) a compression of the first and second rings toward one another such that the axial diameter is decreased or (2) a stretching of the first and second rings away from one another such that the adjustable axial diameter is adjusted, respectively.