Sand Core Hardening via Microwave and Drying Stream
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Solution Overview
Problem
Sand cores produced through 3D manufacturing are often brittle and difficult to handle due to their high brittleness, making it challenging to separate them from excess granular material without risking breakage, and existing hardening methods are inefficient and require additional equipment like microwave ovens.
Innovation Solution
A method and installation that uses a combination of microwaves and a drying stream in a controlled environment within the job box to harden sand cores, where the job box itself serves as a microwave receiver, reducing equipment costs and improving core drying and hardening efficiency, allowing for safer cleaning and increased productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sand cores are produced through 3D manufacturing, then the cores can be made with desired shapes and automated production is improved, but the cores become brittle and difficult to handle
Solution Approach 1:
The patent applies a preliminary hardening action by introducing a drying stream and heating elements during the 3D manufacturing process to evaporate water from the granular material before the core is fully formed. This preliminary removal of water prevents the core from becoming brittle during subsequent handling and cleaning operations, while still maintaining the benefits of automated 3D production.
2Ease of operation
If a hardening step is applied to reduce core brittleness, then the cores become easier to handle and clean, but the production time increases
Solution Approach 1:
The patent implements continuous useful action by integrating the hardening/drying process directly into the 3D manufacturing cycle. The drying stream and heating elements operate continuously during core formation, eliminating the need for separate hardening steps and maintaining continuous production flow, thus reducing overall production time while improving core handleability.
Solution Approach 2:
The patent merges the hardening function with the 3D manufacturing process itself. The drying stream introduction device and heating elements are integrated into the job box, combining the shaping and hardening operations into a single unified process, thereby eliminating sequential steps and reducing total production time.
3Reliability
If a separate microwave oven is used to harden cores, then the hardening effectiveness is improved, but the device complexity and cost increase
Solution Approach 1:
The patent makes the job box multi-functional by equipping it with both 3D manufacturing capabilities and integrated hardening/drying functions. The job box serves as both the construction chamber for adding granular material layers and the hardening chamber for drying the core, eliminating the need for separate microwave oven equipment while maintaining hardening effectiveness.
Solution Approach 2:
The patent enables the job box to serve itself by incorporating drying stream introduction devices and heating elements directly into its structure. The system uses its own internal resources (the job box structure itself) to perform the hardening function, eliminating dependency on external specialized equipment like microwave ovens and reducing overall system complexity.
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 combination of microwaves and a drying stream effectively hardens sand cores, making them less brittle and easier to clean, while reducing the hardening time and increasing productivity in sand core production.
Implementation Method 1
In the hardening step, in order to harden the core microwaves and a drying stream are applied in the inner space of the job box where the core is arranged. The material used for generating cores contains water, and the microwaves successfully move the particles of the water, evaporating it.
Implementation Method 2
The material used for generating cores contains water, and the microwaves successfully move the particles of the water, evaporating it. In addition to contributing to the drying, the drying stream entrains the evaporated water which is discharged from the area around the cores.
Data Source
AI summary
Method and installation for making sand cores. The method includes a generating step which is implemented in a first station of the installation, in which the cores are generated with the desired shape in an inner space demarcated by a job box by means of 3D manufacturing, in which layers of a granular material and of an additive that solidifies the granular material are applied in an alternating manner on a platform of the job box. The method also includes a subsequent hardening step which is implemented in a second station of the installation, in which the cores generated in the generating step are hardened. In the hardening step, in order to harden the previously generated cores microwaves and a drying stream are applied in the inner space of the job box.