Feeder Insert Breaking Point for Casting Mold
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Solution Overview
Problem
Existing metal casting feeder systems require complex and prone-to-clogging spring mandrels, leading to uncontrolled breaking and sand contamination in the casting process, resulting in defects and inefficiencies.
Innovation Solution
A feeder sleeve with a predetermined breaking point formed by an annular recess, allowing controlled piercing and breaking, eliminating the need for spring mandrels and minimizing feeder breakage, while ensuring clean casting by preventing sand ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If spring mandrels are used to mold feeders, then the feeders can be formed, but the spring mandrels become clogged with sand quickly and become unusable
Solution Approach 1:
The invention removes the mandrel entirely from the feeder structure. Instead of using a spring mandrel that penetrates the feeder, the feeder is designed with a breakable connection to the model, allowing the feeder to separate naturally during molding without requiring a mandrel to remain in place.
Solution Approach 2:
The feeder is divided into two separate parts: the model and the feeder body. The feeder is initially connected to the model but designed to break away at a predetermined point, separating the functions of molding support and final casting feed.
2Reliability
If feeders are pushed onto a centering mandrel without spring mandrels, then the feeders cannot move during press-forming, but this causes gases to affect the casting surface and feeders to break
Solution Approach 1:
The feeder design incorporates dynamic characteristics through the breakable connection. During pressing, the feeder can move slightly as the connection breaks in a controlled manner, allowing gas escape while maintaining stability for the majority of the molding process.
Solution Approach 2:
The breakable connection is pre-designed in the feeder structure, allowing the controlled separation to occur automatically during the molding process at the optimal moment, before gas pressure builds up to harmful levels.
3Ease of operation
If a retaining mandrel applies force to pierce the feeder, then the mandrel can break through, but the feeder breaks very often and molding sand gets into the feeder
Solution Approach 1:
The invention eliminates the retaining mandrel piercing mechanism entirely. The feeder is designed to separate from the model without requiring any mandrel to pierce through the feeder body, thus preventing feeder breakage and sand contamination.
Solution Approach 2:
The connection between the feeder and model is designed as a temporary, breakable attachment that serves its purpose during molding and then naturally separates, eliminating the need for durable piercing mandrels and preventing contamination.
4Device complexity
If the feeder lies directly on the model and casting, then the structure is simple, but gases escaping from the feeder have a negative effect on the casting surface
Solution Approach 1:
The feeder is segmented into a model-connected portion and a free-standing portion. The breakable connection allows the feeder to separate from the model, creating space for gas escape while maintaining the simple overall structure.
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
The insert (1) has a feeder body made up of an exothermic and/or insulating material and including an inner space defined by side walls and an upper region (15). A feeder opening is formed in the base region of the body as connection to mold cavity. A predetermined breaking point (16) is provided in the upper region of the insert for piercing through a mandrel (2). The point is formed by a recess (29) in the body such that the body has a reduced wall thickness in the region of the recess.