Casting Mold Pressure Management via Porous Filling Material
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Solution Overview
Problem
Existing methods for casting large-volume castings from cast iron require thick-walled molds or support structures to absorb high internal pressures, which can be cumbersome and energy-intensive.
Innovation Solution
A method where a casting mold is enclosed in a housing with a filling space filled with free-flowing filling material at a temperature of less than 100°C, allowing the metal melt to be poured in and causing the binder to evaporate and burn, leading to the disintegration of the mold without the need for preheating the filling material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If thick-walled casting molds or support structures are used to absorb high internal pressure, then the casting mold can withstand the pressure without bursting, but the device complexity and energy consumption increase
Solution Approach 1:
The patent introduces a filling material as an intermediary substance between the casting mold and the environment. This filling material absorbs the high internal pressure generated during casting, replacing the need for thick-walled molds or external support structures. The filling material acts as a mediator that protects the fragile molding material from pressure-induced failure while maintaining mold integrity.
Solution Approach 2:
The patent employs a disposable filling material that is consumed during the casting process to absorb pressure. Rather than creating permanent, complex support structures, the system uses a temporary, inexpensive filling material that serves its pressure-absorbing function and is then discarded or reused, significantly simplifying the overall mold structure.
2Productivity
If the filling material is preheated to high temperature, then the binder decomposition is accelerated, but the energy consumption and process complexity increase
Solution Approach 1:
The patent implements a self-service mechanism where the filling material is not preheated externally but instead utilizes the heat naturally generated by the exothermic decomposition of the binder in the molding material. The binder decomposition releases heat that automatically raises the filling material temperature to the required 50-100°C, eliminating the need for external heating systems and reducing energy consumption while maintaining rapid mold decomposition.
Solution Approach 2:
The patent changes the temperature parameter of the filling material from traditional high-temperature preheating to a moderate range of 50-100°C. This parameter change is sufficient to accelerate binder decomposition and achieve rapid mold breakdown without requiring energy-intensive preheating processes, thereby improving productivity while reducing energy consumption.
3Quantity of substance
If high bulk density filling material is used, then the filling space is compactly filled, but gas flow through the filling material is restricted
Solution Approach 1:
The patent specifies that the filling material must have porous characteristics that allow gas flow through the filled space. This porosity enables the decomposition gases to escape freely during the casting process while the filling material still provides sufficient compactness for pressure absorption and mold support, resolving the contradiction between density and gas permeability.
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 achieves rapid and energy-efficient decomposition of the casting mold with reduced effort, allowing for simpler plant technology and improved operational reliability, while also ensuring faster cooling and increased dimensional stability of the casting.
Implementation Method 1
the binder of the molding material begins to evaporate and burn
Implementation Method 2
the binder of the molding material begins to evaporate and burn
Implementation Method 3
the filling material filled into the filling space has such a low bulk density that a gas flow can flow through the filling material package
Data Source
AI summary
A process for casting castings in which a casting mold is provided, the casting mold is enclosed in a housing, forming a filling space between at least one inner surface section of the housing and an associated outer surface section of the casting mold, the filling space is filled with a pourable filling material having a bulk density that allows gas to flow through the filling material after the filling of the filling space, and a metal melt is poured into the casting mold. The casting mold radiates heat as a result of the heat input caused by the metal melt, and as a result of the heat input caused by the metal melt, the binder begins to evaporate and burn, no longer binding the molding material, and the casting mold disintegrates into fragments. The filling material has a temperature of less than 100° C. when filled into the filling space.