Casting Mold Bent Portion Cover Member Thermal Management
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Solution Overview
Problem
Casting molds experience deformation and cracking due to thermal expansion and contraction, leading to molten metal adhesion and reduced production efficiency, particularly in bent portions of the passageway where metal flow changes direction.
Innovation Solution
A casting mold design featuring a cover member with lower thermal conductivity than the base material, covering the inner wall of bent portions to manage temperature and prevent cracking, while allowing communication between upstream and downstream passageways.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the passageway is cooled by a cooling device to prevent deformation, then the mold shrinks and the inner wall is compressed, but the inner wall is easily deformed and likely to crack
Solution Approach 1:
The patent applies local quality by providing reinforcement ribs specifically at the bent portion of the passageway where cracks are most likely to occur, rather than uniformly reinforcing the entire mold. This localized reinforcement strengthens the inner wall at the critical area while maintaining the overall cooling functionality of the passageway.
Solution Approach 2:
The patent creates a composite structure by combining the passageway material with reinforcement ribs that have different mechanical properties. The ribs act as a reinforcing phase within the passageway structure, creating a composite that resists compression and cracking while allowing thermal expansion and contraction.
2Shape
If the passageway is constrained to prevent expansion, then the mold maintains shape, but the inner wall is compressed and easily deformed
Solution Approach 1:
The reinforcement ribs are strategically placed at the bent portion where the inner wall is most vulnerable to compression and cracking. This localized reinforcement provides structural support exactly where needed without constraining the overall thermal expansion of the passageway.
Solution Approach 2:
The reinforcement ribs are built into the passageway structure in advance to cushion and absorb the compressive stresses that occur during thermal expansion and contraction. This preemptive reinforcement prevents deformation and cracking before they can occur during operation.
3Reliability
If maintenance work is performed to remove adhered metal and fill cracks, then the mold functionality is restored, but the casting mold is out of operation and production amount is reduced
Solution Approach 1:
The reinforcement ribs are built into the passageway structure in advance to prevent crack formation and metal adhesion before they occur. By preemptively strengthening the bent portion, the patent prevents the need for maintenance operations that would stop production, thereby maintaining both reliability and productivity.
4Ease of operation
If the bent portion is designed to change metal flow direction, then the passageway guides molten metal into the cavity, but the temperature becomes higher and cracks tend to occur
Solution Approach 1:
The reinforcement ribs are specifically placed at the bent portion where temperature is highest and cracks are most likely to occur. This localized reinforcement strengthens the area against thermal stress without interfering with the metal flow guidance function of the bent portion.
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 solution reduces maintenance operations due to metal adhesion, extends mold life, and minimizes production downtime by suppressing temperature rise and crack formation in critical bent areas.
Implementation Method 1
the cover member having a lower thermal conductivity than a base material of the mold
Implementation Method 2
The passageway (corresponding to the sprue, the runner, and the gate) of the casting mold is heated by molten metal and expands
Implementation Method 3
the passageway of the casting mold is cooled by a cooling device and shrinks
Data Source
AI summary
A casting mold includes a cavity for molding a product, and a pouring basin and a passageway that guide molten metal into the cavity. The passageway includes, at portions thereof positioned below the pouring basin and the cavity, bent portions (a first bent portion, a second bent portion) that change the advancing direction of the molten metal, and the casting mold further includes a cover member, which covers the inner wall of the bent portion, allows the passageway positioned on the upstream side of the bent portion to communicate with the passageway positioned on the downstream side of the bent portion, and has a lower thermal conductivity than the base material of the mold.