Automatically-Returning Mold Ejection Device for Steering Knuckle Casting
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Solution Overview
Problem
Existing differential-pressure molds for aluminum alloy automobile steering knuckles face issues with ejection rods not automatically resetting, leading to potential mold damage and casting surface scratches due to asynchronous release and deformation during the molding process, especially with lateral pull core structures.
Innovation Solution
An automatically-returning mold ejection device is designed with a lower-portion part and upper-portion part, featuring returning rod ejection columns, reset springs, and a specific structural arrangement that ensures ejection rods return to their original positions after casting, preventing collisions with lateral pull cores and maintaining uniform stress during the ejecting process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If ejection rods are used to eject castings from the mold, then the casting can be removed from the mold cavity, but the ejection rods remain at ultimate positions and do not reset automatically, causing potential collision with lateral pull cores and mold damage
Solution Approach 1:
The reset spring is pre-installed in the ejection rod structure, ready to automatically push the ejection rod back to its initial position after ejecting the casting. This preliminary preparation of the resetting mechanism ensures that the ejection rod will automatically return without manual intervention, preventing collision with lateral pull cores and avoiding mold damage in the next molding cycle
Solution Approach 2:
The ejection rod system is designed to be self-resetting through the reset spring mechanism. After ejecting the casting, the ejection rod automatically returns to its initial position through spring force without requiring external manual operation. This self-service capability eliminates the need for manual resetting and prevents operational errors that could lead to mold damage
2Ease of operation
If long ejection rods are used to eject castings from deep mold cavities, then the casting can be fully ejected, but the long ejection rods produce large deformations and cause asynchronous release and surface scratching
Solution Approach 1:
The reset spring is pre-compressed during the ejection process and automatically expands to reset the ejection rod to its initial position. This preliminary preparation of the spring mechanism ensures that the ejection rod returns to the correct position without deformation, preventing asynchronous release and surface scratching of the casting
Solution Approach 2:
The reset spring mechanism changes the positional parameter of the ejection rod from the ultimate position to the initial position automatically. By controlling the spring force and compression parameters, the system ensures that the ejection rod returns precisely to its starting position, eliminating deformation and ensuring synchronous release for all ejection rods regardless of length
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 device ensures ejection rods automatically return to their original positions, preventing mold damage and surface scratches, synchronizing the ejection process, and maintaining uniform stress, thus enhancing the quality and longevity of the differential-pressure steering knuckle casting mold.
Implementation Method 1
the upper-middle positions of the returning rods (5) are sleeved with the reset springs (12), the reset springs (12) are located at the circular hole positions of the flange centers of the returning rods (5) and are configured to make the lower ends of the reset springs (12) in contact with flange circular groove planes of the upper mold connecting plate (18) and the upper ends of the reset springs (12) in contact with lower planes of the returning rod connecting plates (13), so that the reset springs (12) are compressed and spring back only in the vertical direction
Data Source
AI summary
An automatically-returning mold ejection device and a casting mold comprising the same. The mold ejection device includes a lower-portion part and an upper-portion part and is wherein the lower-portion part comprises returning rod ejection columns fixed to a mold rack base plate; the upper-portion part comprises returning rods corresponding to the returning rod ejection columns, the top ends of the returning rods are fixed to an ejection rod pushing plate and penetrate through an upper mold connecting plate through returning rod flanges, and a lower mold core of a mold is fixed to the mold rack base plate through a screw. An embodiment of the device has the advantages that the self-returning structure is simple, easy to install and convenient to replace and maintain, and has very good practicability.