Crankcase Casting Mold with Pre-Centered Land Core
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Solution Overview
Problem
The existing methods for cooling crankcases of internal combustion engines are time-consuming, costly, and inflexible, particularly due to the challenging positioning of cooling duct cores in thin-walled inter-cylinder lands, which requires precise and reliable alignment.
Innovation Solution
A casting mold for crankcases featuring a water jacket core with a frame core, cooling-duct core, and land core, where the land core is pre-centered within the frame core and further centered via a top core, utilizing separate retaining surfaces for stability and accurate positioning, and made from inorganic molding sand for environmental friendliness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cooling ducts are bored after the crankcase has been cast, then cooling functionality is achieved, but the process is time-consuming and costly
Solution Approach 1:
The cooling ducts are formed during the casting process itself by inserting water jacket cores and land cores into the mold before casting, rather than boring them after casting. This preliminary formation of cooling ducts eliminates the need for subsequent machining operations, significantly reducing manufacturing time and cost while ensuring the cooling functionality is integrated into the crankcase structure
2Reliability
If cooling ducts are formed by boring after casting, then cooling functionality is achieved, but the geometry is inflexible
Solution Approach 1:
The invention enables flexible geometry of cooling ducts by using specially designed water jacket cores and land cores with varying cross-sections, lengths, and configurations. These cores can be customized to create cooling ducts with different geometries adapted to specific engine designs and thermal management requirements, providing both functionality and geometric flexibility
3Reliability
If land cooling cores are used during casting, then cooling ducts are formed, but positioning is problematical and requires exceptional accuracy
Solution Approach 1:
The invention introduces frame cores as intermediary structures that provide standardized positioning surfaces and support for the water jacket cores and land cores. The frame cores act as mediators between the mold and the cooling duct cores, ensuring accurate and repeatable positioning through fixed geometric relationships, thereby reducing positioning problems and tolerance requirements
4Reliability
If land cores are positioned in thin-walled lands, then cooling ducts are formed, but minimal tolerances are permitted
Solution Approach 1:
The frame cores serve as intermediary positioning structures that support the water jacket cores and land cores at multiple points, distributing the positioning requirements and reducing the tolerance burden on any single interface. This intermediary framework enables the formation of cooling ducts in thin-walled lands while maintaining acceptable tolerances through cumulative positioning rather than single-point precision
Data Source
AI summary
A casting mold for a crankcase of an internal combustion engine includes a water jacket core which has a frame core and a cooling duct core. A land core is provided which is designed and positioned in such a way as to form a cooling duct in an inter-cylinder land of a crankcase. The land core is retained in the frame core and is, or can be, centered using a top core.