Compressible Feeder Sleeve for Metal Casting Pressure Resistance
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Solution Overview
Problem
Existing feeder systems in metal casting face challenges such as feeder sleeve breakage under high compression pressures, poor surface finish, and contamination due to exothermic materials, especially in high-pressure moulding processes, which affect the quality and complexity of castings.
Innovation Solution
A feeder system comprising a feeder sleeve mounted on a tubular body with a compressible portion that collapses under pressure, preventing sleeve breakage and incorporating a design that reduces the amount of cold metal, thereby improving feed performance and surface finish by embedding the tubular body within the feeder sleeve.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high compression pressures are applied during moulding to produce uniform strength moulds, then manufacturing productivity and mould strength are improved, but feeder sleeve breakage increases
Solution Approach 1:
A compressible breaker core is introduced as an intermediary element between the feeder sleeve and the mould cavity. This breaker core absorbs the high compression pressures during moulding, protecting the feeder sleeve from breakage while still allowing the mould to achieve uniform strength. The breaker core acts as a buffer that takes the place of the feeder sleeve in withstanding compression forces.
2Temperature
If exothermic materials are used in the feeder sleeve to maintain molten metal temperature, then feed performance is improved, but contamination and poor surface finish occur
Solution Approach 1:
The harmful exothermic material is extracted from the feeder sleeve and replaced with a non-exothermic compressible breaker core. This eliminates the source of contamination and surface defects while still maintaining the ability to protect the feeder sleeve during moulding. The temperature maintenance function is achieved through alternative means that do not involve exothermic reactions.
3Ease of operation
If the feeder sleeve cavity is tapered to facilitate knock-off of residual metal, then ease of operation is improved, but the footprint on the casting increases
Solution Approach 1:
The feeder system is segmented into distinct functional zones: the feeder sleeve maintains a consistent diameter for compact footprint, while the breaker core provides the necessary tapering and structural features for effective knock-off. This segmentation allows each component to optimize its shape for its specific function without compromising the other requirements.
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 effectively withstands high compression pressures, reduces the risk of sleeve breakage, and enhances feed performance and surface quality by absorbing energy and minimizing heat absorption from the metal, leading to improved casting outcomes.
Implementation Method 1
the tubular body having a first end and an opposite second end and a compressible portion therebetween so that upon application of a force in use, the distance between the first and second ends is reduced
Implementation Method 2
absorbing energy and minimizing heat absorption from the metal
Implementation Method 3
the cavity for receiving liquid metal during casting
Data Source
Figure 1a~1b
Figure 2a~2b
Figure 3a~3b
AI summary
A feeder system for metal casting comprising a feeder sleeve mounted on a tubular body. The tubular body has a first end and an opposite second end and a compressible portion therebetween so that upon application of a force in use, the distance between the first and second ends is reduced. The feeder sleeve has a longitudinal axis and comprises a continuous sidewall extending generally around the longitudinal axis that defines a cavity for receiving liquid metal during casting, the sidewall having a base adjacent the second end of the tubular body. The tubular body defines an open bore therethrough for connecting the cavity to the casting. The feeder sleeve has at least one cut-out that extends into the sidewall from the base and the second end of the tubular body projects into the cut-out to a fixed depth. The cut-out can be a groove which is separate from the cavity. The invention also resides in a feeder sleeve for use in the system and a process employing the feeder system.