Cast Component Cast-In Pipe Zinc Alloy Bushing Seal
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Solution Overview
Problem
Existing cast components with cast-in tubes often experience gaps or air gaps due to unfavorable material bonds and thermal expansion differences, leading to leaks as the medium intended to flow through the tube can escape into these gaps.
Innovation Solution
A metallic cast component with a metal bushing embedded in the cast body surface at the pipe end, forming a seal between the pipe and the cast body, using a zinc alloy bushing bonded to the aluminum alloy cast body, which is soldered, welded, or pressed onto the pipe end to prevent medium leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a tube is cast directly into a die-cast part, then the tube is securely embedded in the casting body, but gaps or air gaps form between the tube and casting material due to unfavorable material bonds and thermal expansion differences
Solution Approach 1:
A bushing made of zinc alloy is introduced as an intermediary component between the steel tube and the aluminum die-cast housing. The bushing is bonded to the tube and embedded in the casting material, serving as a mediator that bridges the two materials with incompatible thermal expansion properties and material bonds, thereby preventing gap formation and ensuring reliable sealing
Solution Approach 2:
The solution employs a composite structure consisting of three different materials: the steel tube, the zinc alloy bushing, and the aluminum die-cast housing. This multi-material composite approach allows each component to contribute its specific properties (strength, bondability, casting compatibility) to achieve a gap-free, leak-proof connection that none of the materials could provide alone
2Reliability
If end caps are used to seal tube ends during casting, then the tube ends are sealed against molten metal ingress, but the sealing effort at pipe connections increases and requires additional machining steps
Solution Approach 1:
The bushing combines multiple functions into a single integrated component: it seals the tube end against molten metal ingress during casting, provides a mounting surface for pipe connections, and ensures leak-proof connection to both the tube and housing. This merges the functions of end caps, mounting brackets, and sealing elements into one element, reducing overall device complexity
Solution Approach 2:
The bushing serves multiple purposes simultaneously: it acts as a seal against molten metal, provides structural support for pipe connections, enables thermal and mechanical coupling between dissimilar materials, and creates leak-proof pathways for fluid flow. This multi-functionality eliminates the need for separate sealing components and reduces assembly steps
3Ease of operation
If pipe fittings are located at the casting surface, then external access to the tube is enabled, but gaps can extend along the pipe to the component surface where connections are located, allowing medium to escape
Solution Approach 1:
The bushing acts as an intermediary sealing element at the casting surface where pipe connections are located. It prevents gaps from extending to the surface by creating a continuous sealed path between the tube interior and the external connection points, ensuring that the medium cannot escape through gap pathways while maintaining external accessibility
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 seals gaps between the cast material and the pipe, ensuring the medium remains within the pipe and preventing leaks, reducing the effort required for sealing at pipe connections.
Implementation Method 1
a bond can form between the aluminum alloy of the casting body and the zinc alloy of the bushing to be embedded
Implementation Method 2
with which a seal between the respective pipe end and the casting body is achieved or effected
Data Source
Figure 1~2
AI summary
The invention relates to a metallic cast component (100) which, in particular, is a housing component, comprising a cast body (110) and at least one pipe (120) which is cast in the cast body and through which a medium (F) can flow, wherein, at at least one of the pipe ends of the pipe, the pipe (120) has a pipe connection (121, 122) formed on or in the cast body surface. At this pipe end, the pipe (120) also has an enclosing bush (130), which is embedded in the cast body (110) and which effects a seal between the pipe and and the cast body (110). The invention further relates to a method for producing such a cast component (100).