Under-blow Core Molding Machine with Fluidized Sand Filling
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Solution Overview
Problem
The under-blow type core molding machine faces challenges in effectively filling a core box with sand due to blowing sand against gravity, which affects the filling property.
Innovation Solution
A core molding machine with a blow head positioned under the core box, utilizing a sand filling device that includes a sand blow chamber, a compressed air supply unit, and an aeration air supply unit to float and fluidize the sand, ensuring it is blown upward into the core box, along with a rotary drive unit for rotating the movable die to simplify the machine's design and enhance sand filling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the under-blow type is employed to reduce machine height, then the machine size in height direction is reduced, but the filling property of core sand deteriorates due to blowing against gravity
Solution Approach 1:
The patent employs pneumatic principles by introducing aeration air through air holes in the blow head to fluidize the core sand. This creates a fluid state that allows sand to be blown upward effectively against gravity, resolving the filling property deterioration while maintaining the under-blow type compact configuration
Solution Approach 2:
The patent changes the physical state parameter of core sand from solid to fluidized state by supplying aeration air. This parameter change enables the sand to be propelled upward effectively, solving the problem of poor filling property in under-blow type machines
2Manufacturing precision
If the top-blow type is employed to improve sand filling property, then the filling property is improved, but the machine height increases making the machine bulky
Solution Approach 1:
The patent inverts the conventional top-blow configuration by using under-blow type, positioning the blow head below the core box. By combining this inverted configuration with aeration technology, it achieves both compact machine height and effective sand filling
3Adaptability or versatility
If separate actuators are added for rotation and cleaning functions, then the operational versatility is improved, but the device complexity increases
Solution Approach 1:
The patent makes the movable die perform multiple functions: it serves as both the molding cavity and the rotation mechanism. The movable die rotates together with the core during the molding cycle, eliminating the need for separate rotation actuators while maintaining operational versatility
Solution Approach 2:
The patent merges the cleaning function into the die opening process. When the movable die separates from the fixed die, the core is naturally released and can be removed, combining the release and cleaning operations into a single mechanical motion without requiring separate cleaning actuators
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 machine effectively fills the core box with sand even when using the under-blow type, improving the filling property while maintaining a compact size and simplifying the machine's design by eliminating the need for separate actuators for rotation and cleaning.
Implementation Method 1
an aeration air supply unit for supplying an aeration air for floating and fluidizing the core sand within the sand blow chamber
Data Source
Figure 1
Figure 2(a)~2(b)
Figure 3(a)~3(b)
AI summary
A core molding machine which can be made smaller while having a favorable core sand filling property is provided. The machine comprises a core box having a pair of laterally separable dies and a sand filling device, having a blow head disposed under the core box, for filling the core box with core sand directed upward from the blow head; the blow head having a sand blow chamber for guiding the core sand to the core box while being connected to the core box and a sand storage chamber communicating with the sand blow chamber; the sand filling device having a compressed air supply unit for supplying a compressed air for blowing the core sand into the core box and an aeration air supply unit for supplying an aeration air for floating and fluidizing the core sand within the sand blow chamber.