Foundry Core Hardening Catalyst Vapor System
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Solution Overview
Problem
Existing methods for hardening foundry cores made of sand-containing molding materials are inefficient, requiring long curing times and high catalyst consumption, leading to increased costs, environmental impact, and complex safety monitoring.
Innovation Solution
A device that heats the organic catalyst and compressed air together in a heating and mixing stage, with separate lines for catalyst vapor and compressed air, allowing for time-controlled gassing and flushing, reducing catalyst usage and eliminating the need for preheating and complex temperature control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the curing process is accelerated by overdosing amines, then the curing time is reduced, but the binder may be partially dissolved again, reducing the final strength of the core to approx. 80 to 85%
Solution Approach 1:
The invention changes the physical state of the catalyst from liquid amine to gaseous catalyst vapor, and adjusts the temperature parameter to 50-150°C range. This allows precise control of the curing process without overdosing, maintaining both fast curing time and full binder strength by using catalytic vapor that reacts completely and predictably with the resin system.
Solution Approach 2:
The invention replaces the mechanical dosing system (pumps, valves, pressure control) with a thermal field-based system. By heating the catalyst to generate vapor and controlling the temperature parameter, the process eliminates the need for complex mechanical dosing mechanisms, achieving more reliable and consistent catalyst delivery.
2Quantity of substance
If dosing pumps are switched on between the catalyst source and the mixing point, then the catalyst can be better dosed, but the pressure conditions in the catalyst feed remain absolutely indifferent during each dosing process
Solution Approach 1:
The invention extracts the pressure control function from the catalyst feed line by separating the catalyst delivery system from the compressed air supply system. The catalyst is delivered as vapor through a separate pathway, eliminating pressure fluctuations and control issues associated with liquid dosing pumps, while compressed air provides stable pressure for the gassing process.
3Productivity
If both catalyst vapor-carrier gas mixture and compressed air are stored in dosing containers and shot suddenly, then the gassing process can be controlled, but the technical effort is enormous and systems of this type allow few variables
Solution Approach 1:
The invention segments the gas delivery system into separate pathways: one for catalyst vapor generation and another for compressed air supply. This allows independent control of each component, simplifying the overall system compared to using complex dosing containers for both gases, while maintaining precise control over the gassing process through separate temperature and pressure parameters.
4Temperature
If preheated compressed air is supplied via a switching valve to a heating and mixing stage and a reheater, then contour hardening can be achieved, but close monitoring of temperatures is required to ensure the safety of the facility
Solution Approach 1:
The invention merges the heating functions into a single integrated heating and mixing stage, eliminating the need for separate reheaters and multiple temperature monitoring points. The catalyst and compressed air are heated together in one location, simplifying the temperature control system while achieving the necessary temperature profiles for effective gassing and contour hardening.
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 approach significantly reduces catalyst consumption, emissions, and disposal costs, while maintaining cycle time and safety, resulting in a more environmentally friendly and cost-effective process.
Implementation Method 1
heats the organic catalyst and compressed air together in a heating and mixing stage
Implementation Method 2
a heating source (3) by means of which the compressed air used for the time-controlled flushing is heated separately
Implementation Method 3
the core, for its hardening in a core mold, is exposed to a mixture of catalyst vapor and carrier gas
Data Source
Figure 1
AI summary
A device for hardening foundry cores of a sand-containing molding material, wherein the core, for its hardening, is subjected in a core molding tool to a catalyst vapor/carrier gas mixture and subsequently to a pressurized air stream is provided. Each of the vapor/carrier gas and air stream are at a predetermined pressure and a predetermined temperature, wherein a heating and mixing stage, is connected to a container containing an organic catalyst in liquid form and to a pressurized air source. The liquid organic catalyst and the pressurized air are heated together in the heating and mixing stage. The device has a separate flushing line, wherein a first cutoff valve is arranged in the line to the heating and mixing stage, which is closed at the beginning of the flushing, and a second cutoff valve is arranged in the flushing line, which is open at the beginning of the flushing.