Foundry Core Deformation Method for Complex Geometries
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional foundry core production methods limit design freedom and complexity due to brittleness and the inability to produce undercuts without complex core boxes or additional loose parts, restricting the creation of intricate core geometries like hourglass or wound helix shapes.
Innovation Solution
A method involving the use of a mould material mixture of binder and mould sand, where the foundry core is shaped by external deformation after initial hardening, allowing for deformation techniques like bending, compressive, or torsional deformation within specific temperature and force ranges to achieve complex shapes without requiring multi-part core boxes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional core shooting machines with standard mould materials are used, then foundry cores can be produced efficiently, but the cores are brittle and breakable, limiting design freedom and complexity
Solution Approach 1:
The patent applies parameter changes by heating the foundry core to a deformation temperature (e.g., 100-300°C) before deformation, which changes the material's physical state from brittle to more ductile, enabling subsequent deformation without breaking
Solution Approach 2:
The patent performs preliminary heating of the foundry core before deformation to soften the binder and mould sand mixture, preparing the material to be more susceptible to deformation forces while maintaining structural integrity
2Shape
If multi-part core boxes or loose parts are used to produce undercuts, then complex geometries can be formed, but the device complexity and production time increase significantly
Solution Approach 1:
The patent forms the basic core shape in a standard single-part core box, then performs additional deformation operations (bending, twisting, compressing) after removal from the mould to create undercuts and complex geometries, eliminating the need for complex multi-part core boxes
Solution Approach 2:
The patent transforms the static mould cavity into a dynamic process by applying external deformation forces (mechanical, thermal, or combined) after core removal, enabling the core to be shaped into complex forms like undercuts, hourglass shapes, and wound helices without complex moulding tools
3Ease of manufacture
If standard mould materials are used without additives, then the production process is simple, but the dimensional stability and surface quality are insufficient
Solution Approach 1:
The patent introduces additives (e.g., lubricants, plasticizers, or surface modifiers) to specific components of the mould material mixture to improve local properties such as dimensional stability and surface quality while maintaining the overall simplicity of the production process
Solution Approach 2:
The patent enhances the mould material by combining standard binder and mould sand with additional additives to create a composite mixture that provides improved dimensional stability and surface quality while maintaining processability
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 method enhances design freedom and complexity in cast parts, enabling the production of undercuts and optimizing dimensional stability and surface quality, allowing for the creation of previously unattainable core geometries with improved properties.
Implementation Method 1
d) heating the foundry core to a deformation temperature
Implementation Method 2
e) deforming the heated foundry core by applying a deformation force to the foundry core
Implementation Method 3
f) cooling the foundry core
Data Source
AI summary
Foundry cores, which consist of a mould material mixed from a binder and a mould sand, as well as optionally added additives, that are moulded in a complex way or are optimised with regard to their quality and which are provided for casting cast parts, can be produced by: a) moulding the foundry core by introducing the mould material into a foundry core mould; b) hardening the mould material; c) removing the foundry core from the foundry core mould; d) heating the foundry core to a deformation temperature; e) deforming the heated foundry core by applying a deformation force to the foundry core; and f) cooling the foundry core.