Cylinder Block Casting with Homogeneous Dummy Liner
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Solution Overview
Problem
The existing cylinder block manufacturing methods for aluminum alloy blocks with cast-in iron-based liners are costly due to the need for machining the dummy cylinder liner and recycling issues, as well as inefficiencies in molten metal flow during the casting process.
Innovation Solution
A method involving a dummy cylinder liner made of aluminum alloy, with a longer axial length and specific internal diameters to form seals with the dies, allowing molten aluminum to overcast the iron-based cylinder liner without the need for machining, and enabling efficient recycling by eliminating the separation of the dummy cylinder liner from the block during re-melting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an iron-based cylinder liner is used in the preheating step, then the sealing effect is improved, but the recycling process becomes complex and costly due to the need to separate the liner from the dummy block
Solution Approach 1:
The dummy cylinder liner is made of the same aluminum alloy material as the dummy block, creating a homogeneous structure. This allows the entire dummy assembly to be recycled together without separation, eliminating the complex recycling process while maintaining the sealing function during preheating
2Device complexity
If an aluminum alloy cylinder liner is used in the preheating step, then the recycling process is simplified, but machining is required to prevent molten metal infiltration, increasing manufacturing cost
Solution Approach 1:
The dummy cylinder liner is made of the same aluminum alloy material as the dummy block, creating a homogeneous structure. This allows the entire dummy assembly to be recycled together without separation, eliminating the complex recycling process while maintaining the sealing function during preheating
3Manufacturing precision
If the dummy cylinder liner has the same dimensions as the iron-based cylinder liner, then the casting accuracy is improved, but the sealing effect deteriorates due to molten metal flow between the liner and liner support
Solution Approach 1:
The dummy cylinder liner is designed with an enlarged axial length before the actual casting process. This preliminary dimensional adjustment creates a seal between the liner and liner support, preventing molten metal infiltration while maintaining accurate casting dimensions
4Reliability
If the dummy cylinder liner is made of iron-based material, then the sealing effect is improved, but the manufacturing cost increases due to the expense of aluminum alloy materials
Solution Approach 1:
The dummy cylinder liner is made of the same aluminum alloy material as the dummy block, creating a homogeneous structure. This allows the entire dummy assembly to be recycled together without separation, eliminating the complex recycling process while maintaining the sealing function during preheating
Data Source
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AI summary
In a cylinder block manufacturing method, first and second dies (1 and 2) and a liner support (4) are provided to form a liner overcast configuration. The first and second dies (1 and 2) are positioned with respect to the liner support (4) and a dummy cylinder liner (7) made of an aluminum alloy such that the first die (1) contacts a pressing section (4b) of a first axial end of the liner support (4) and a first axially facing end of the dummy cylinder liner (7), and the second die (2) contacts a second axial end of the liner support (4) and a second axially facing end of the dummy cylinder liner (7). The first and second dies (1 and 2) are preheated to a prescribed temperature (T*) with the dummy cylinder liner (7) positioned on the liner support (4) by injecting molten aluminum alloy into a cylinder block molding cavity (6) to form a dummy cylinder block with the dummy cylinder liner (7) casted in the dummy cylinder block.