Extrusion Press Dummy Block With Elastic Plunger Disc
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing dummy blocks for metal extrusion presses face challenges in efficiently transferring force to the billet due to stress concentrations and limited deformation capabilities, leading to potential jamming and reduced operational efficiency at higher pressures.
Innovation Solution
A dummy block design featuring a separate plunger disc and shaft with an obtuse angle configuration, allowing for elastic deformation and reduced stress concentrations, along with a shrink-fitted collar that expands elastically to accommodate the billet, enabling improved force transfer and increased operational pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a traditional dummy block design is used, then the structure is simple, but stress concentrations occur and force transfer efficiency is limited
Solution Approach 1:
The dummy block is segmented into distinct components: a plunger shaft and a plunger disc. This segmentation allows the plunger disc to be replaced independently when worn, while the shaft can be reused. The separation enables optimized design of each component for its specific function, improving overall force transfer efficiency without requiring complete replacement of the entire dummy block assembly.
Solution Approach 2:
The plunger disc is designed with dynamic deformation capabilities, allowing it to elastically deform under extrusion pressure and then recover. This dynamic behavior enables the plunger disc to accommodate variations in billet geometry and maintain optimal contact pressure throughout the extrusion process, significantly improving force transfer efficiency compared to rigid traditional designs.
2Productivity
If higher extrusion pressures are applied, then productivity increases, but stress concentrations cause jamming and operational failures
Solution Approach 1:
The plunger disc's elastic deformability allows it to dynamically adapt to varying extrusion pressures and billet conditions. Under high pressure, the disc deforms to maintain uniform contact with the billet, preventing stress concentrations that would cause jamming. This dynamic response enables reliable operation at higher extrusion pressures, directly improving productivity without sacrificing reliability.
Solution Approach 2:
The invention changes the mechanical parameters of the dummy block by introducing a deformable plunger disc with specific elastic properties. This parameter change allows the system to operate in the elastic deformation regime even under high extrusion pressures, preventing the plastic deformation and permanent damage that would otherwise occur and cause operational failures.
3Ease of repair
If the plunger disc and shaft are integrated, then manufacturing is simpler, but maintenance costs increase due to complete replacement requirements
Solution Approach 1:
By segmenting the dummy block into a reusable shaft and a replaceable plunger disc, the invention enables selective replacement of only the worn component. The plunger disc, being the element subject to wear from contact with the billet, can be replaced independently while the shaft is retained. This segmentation dramatically reduces maintenance costs compared to replacing the entire integrated dummy block, while the manufacturing complexity increase is offset by the modular assembly process.
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
The design enhances force transfer efficiency, allows for higher extrusion pressures, and reduces maintenance costs by enabling easy replacement of the plunger disc while reusing the shaft, while maintaining the plunger disc in the elastic deformation regime to prevent plastic deformation.
Implementation Method 1
maintaining the plunger disc in the elastic deformation regime to prevent plastic deformation
Implementation Method 2
a shrink-fitted collar that expands elastically to accommodate the billet
Data Source
AI summary
A dummy block for a metal extrusion press includes: a generally cylindrical base having a forward surface and an outwardly extending circumferential flange; an expandable collar coupled to the base, the collar having an inwardly extending circumferential rib abutting the circumferential flange; a plunger disc seated against the forward surface of the base and accommodated by the collar, and a plunger shaft extending through the plunger disc and coupled to the base.