Porous Casting Die Steam Distribution for Uniform Heating
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Solution Overview
Problem
Conventional methods for manufacturing casting molds using resin-coated sand face challenges such as the generation of toxic substances and distortion due to uneven heating, particularly when using steam to cure the binder, as the steam distribution is inadequate for complex mold shapes.
Innovation Solution
A casting mold manufacturing apparatus and method utilizing a forming die made of porous material with strategically positioned injection and discharge holes, allowing steam to penetrate uniformly throughout the resin-coated sand, ensuring even heating and preventing toxic substance generation by using a steam supply system that includes a steam generator and heater to maintain the curing temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If steam is supplied through one or several injection holes to cure the binder, then toxic substance generation is prevented, but uniform heating of complex-shaped molds becomes difficult
Solution Approach 1:
The injection hole is divided into multiple small-hole arrays arranged in matrix patterns across the die surface. This segmentation allows steam to be injected at multiple distributed locations simultaneously, achieving uniform heating throughout the resin-coated sand while maintaining the steam curing method that prevents toxic substance generation.
Solution Approach 2:
Multiple injection holes are strategically arranged at different locations and orientations within the die to match the specific geometry of the mold cavity. This localized distribution ensures that steam penetrates uniformly into complex-shaped regions, addressing the heating uniformity problem while preserving the benefits of steam curing.
2Productivity
If the die is heated to high temperature to cure the binder, then manufacturing productivity is improved, but toxic substances are generated and mold distortion occurs
Solution Approach 1:
Steam is introduced as an intermediary heating medium between the die and the resin-coated sand. The steam circulates through the resin-coated sand particles, transferring heat uniformly and curing the binder at moderate temperatures. This eliminates direct contact between hot die surfaces and resin-coated sand, preventing toxic substance generation while maintaining manufacturing productivity.
3Speed
If the resin-coated sand is rapidly heated by contact with the hot die, then curing speed is improved, but mold distortion such as warpage occurs
Solution Approach 1:
Steam acts as an intermediary that transfers heat uniformly throughout the resin-coated sand mass. This indirect heating method prevents rapid localized heating at die-contact surfaces, eliminating thermal gradients that cause warpage and distortion while maintaining efficient curing speed through continuous steam circulation.
Solution Approach 2:
The direct thermal conduction mechanism (heat transfer through die-mold contact) is replaced with a fluid-based heat transfer system using steam circulation. This substitution enables uniform heat distribution throughout the resin-coated sand, preventing the rapid localized heating that causes mold distortion while maintaining high curing efficiency.
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 enables the production of homogeneous casting molds with improved quality and reduced distortion, as evidenced by higher bending strength and uniform steam distribution, even for complex shapes, while maintaining a safe working environment by preventing toxic substance generation.
Implementation Method 1
utilizing a forming die made of porous material with strategically positioned injection and discharge holes, allowing steam to penetrate uniformly throughout the resin-coated sand
Implementation Method 2
a steam supply system that includes a steam generator and heater to maintain the curing temperature
Implementation Method 3
blowing steam inside the die, whereby the resin-coated sand inside the die is heated with the steam and a binder therein is cured
Data Source
Figure 1(A)~1(C)
Figure 2~3
Figure 4(A)~4(B)
AI summary
To provide a casting mold manufacturing apparatus using steam heating. The apparatus includes a forming die having a cavity, a resin-coated sand supply section for supplying a resin-coated sand into the cavity, a steam supply section for supplying steam into the cavity, and a steam discharge section for discharging the steam from the cavity. At least a portion of the forming die is composed of a porous material having pores with an average diameter smaller than an average particle diameter of the resin-coated sand. At least a portion of the steam is supplied into the cavity through the porous material. Since it is possible to uniformly supply the steam into the cavity, a homogeneous casting mold can be manufactured.