Differential Carrier Mold With Inserted Pipe Fixation
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Solution Overview
Problem
High pressure casting processes face challenges in manufacturing differential carrier cases with inserted pipes, particularly due to shrinkage defects, oil leakage, and corrosion issues, especially when forming thick portions, as existing methods require external fixing devices that expose the pipe to the outside, leading to increased costs and reduced durability.
Innovation Solution
A mold assembly with a pipe inserted and fixed internally using a mold core and drive core pin, allowing for two-axis or three-axis fixation without external exposure, preventing shrinkage defects and corrosion by forming a thick portion without external sealing, thereby reducing manufacturing processes and costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If external fixing devices are used to secure the pipe during high pressure casting, then the pipe can be firmly fixed, but the pipe is exposed to the outside leading to oil leakage and corrosion
Solution Approach 1:
The pipe fixing mechanism is nested within the mold cavity itself. The pipe is inserted into the mold core and secured using internal fixing structures (such as positioning holes and fixing pins) that are integrated into the mold design, rather than using external fixing devices. This nesting approach keeps the pipe secured while preventing exposure to the external environment, thereby eliminating corrosion and oil leakage issues.
Solution Approach 2:
The mold core acts as an intermediary between the pipe and the external environment. By inserting the pipe into the mold core and using internal fixing mechanisms, the mold core mediates the securing process while protecting the pipe from external harmful factors. The thick portion surrounding the pipe further serves as a protective intermediary layer.
2Stability of the object's composition
If the pipe is inserted into the mold for high pressure casting, then integration is improved, but shrinkage defects occur along thick portions
Solution Approach 1:
The mold design incorporates local quality variations through the thick portion surrounding the pipe. This thick portion is strategically designed to control cooling rates and metal flow in specific areas, preventing shrinkage defects while maintaining overall integration. The local thickening provides structural support and regulates solidification patterns in the critical pipe region.
3Weight of moving object
If aluminum alloy is used for weight reduction, then weight decreases, but shrinkage defects occur more frequently due to smaller thickness
Solution Approach 1:
The invention changes the local thickness parameter by introducing a thick portion surrounding the pipe in aluminum alloy components. This parameter change compensates for the inherently smaller wall thickness of aluminum alloys, providing sufficient structural support and controlling cooling rates to prevent shrinkage defects while maintaining the weight reduction benefits of using aluminum alloy.
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 internal fixation of the pipe in the mold assembly prevents shrinkage defects and oil leakage, enhances corrosion resistance, and reduces manufacturing costs by eliminating the need for external fixing devices, enabling the production of high-quality differential carrier cases with thick portions.
Implementation Method 1
a mold core pin which is fixed to the mold core so as to fix the mold core and one end of the pipe, and a drive core pin which is inserted into the other end of the pipe
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
A differential carrier case with an inserted pipe for high pressure casting may include a mold core into which a first end of a pipe is inserted, a mold core pin fixed to the mold core to fix the mold core and the first end of the pipe, a drive core pin inserted into a second end of the pipe, and a thick portion surrounding an outer portion of the pipe.