Segmented Casting Mold Ventilation Gap Design

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Solution Overview

Problem

Existing ventilation apparatuses for casting molds face issues with wear in the inflow region due to high flow velocities, leading to increased maintenance costs and the need for expensive wear-resistant materials, and can be hindered by premature solidification of material in ventilation channels.

Innovation Solution

The apparatus features segmented mold halves with interchangeable segments made from cost-effective materials, such as steel, and a stair-shaped gap design with varying materials like tungsten and copper alloys to optimize wear resistance and heat dissipation, allowing for efficient air and molten metal flow without the need for a cooling device or ejector.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If wear-resistant materials are used in the inflow region, then wear resistance is improved, but manufacturing cost increases

Engineering Contradiction:

Improvewear resistanceVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The valve body is divided into multiple segments that can be independently replaced. The wear-prone inflow region can be renewed by replacing only the affected segment rather than the entire valve body, significantly reducing maintenance costs while maintaining wear resistance where needed

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the valve body have different material properties tailored to their specific functions. The inflow region uses wear-resistant materials or coatings, while other regions use standard materials, optimizing both performance and cost by applying expensive materials only where necessary

Inventive Principle:

Principle #3Local quality

2Productivity

If high flow velocity is achieved in the valve body, then ventilation efficiency is improved, but wear in the inflow region increases

Engineering Contradiction:

Improveventilation efficiencyVSAvoidwear resistance

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The valve body is segmented so that the high-wear inflow region can be independently replaced. This allows the design to maintain high flow velocities for ventilation efficiency while accepting that the inflow segment will wear and needs periodic replacement, rather than requiring the entire structure to be overly robust

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The high flow velocity that causes wear is converted into a beneficial feature for ventilation efficiency. The design accepts wear in the inflow region as a trade-off for achieving the necessary flow rates, and manages the wear through segment replacement rather than trying to eliminate it through design modifications

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Manufacturing precision

If ventilation channels are designed for efficient air removal, then casting quality is improved, but premature solidification of material may occur

Engineering Contradiction:

Improvecasting qualityVSAvoidventilation channel functionality

Core Design Contradiction:

Manufacturing precisionVSReliability

Solution Approach 1:

The geometry parameters of the ventilation channels are optimized to balance air removal efficiency with prevention of premature solidification. Channel dimensions, curvature, and positioning are carefully selected to maintain molten material flow while effectively evacuating air from the casting cavity

Inventive Principle:

Principle #35Parameter changes

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 configuration reduces maintenance costs by allowing individual segment replacement, minimizes wear, and ensures high-quality cast parts by optimizing ventilation without premature solidification, while maintaining low operational costs and handling ease.

Implementation Method 1

a gap having an inlet and an outlet forms between the mold halves, at least in part, which gap is particularly washboard-shaped, labyrinth-shaped and/or meander-shaped, and through which gap air displaced out of the casting mold and excess molten material can flow during filling of the casting mold

Methodology Applied

Scientific EffectFluid flow through gap:

Implementation Method 2

at least one or preferably each mold half is formed by multiple segments disposed next to one another in the longitudinal direction of the mold half and releasably attached, preferably connected with one another

Methodology Applied

Scientific EffectMechanical attachment: Mechanical Fastener

Data Source

PatentUS9272326B2Apparatus for ventilation of a casting mold

Publication Date: 2016.03.01 KSM CASTINGS GROUP GMBH

AI summary

An apparatus for ventilation of a casting mold has two mold halves that lie opposite one another and are complementary, in terms of shape and function, to one another. The halves have a plurality of elevations and/or depressions, in each instance, which run essentially parallel to one another and essentially transverse to a flow direction, on their surfaces that face one another, in such a manner that when the mold halves are set onto one another, a gap having an inlet and an outlet forms between the mold halves, at least in part. The gap is washboard-shaped, labyrinth-shaped and/or meander-shaped. Through the gap, air displaced out of the casting mold and excess molten material flow during filling of the casting mold. At least one mold half is formed by multiple segments disposed next to one another in the longitudinal direction of the mold half and releasably attached.