Hybrid Core Driving Device for Die Casting Machines
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Solution Overview
Problem
Existing core driving devices for die casting machines require large amounts of hydraulic oil, have complex structures, and share hydraulic circuits with mold clamping devices, making it difficult to shorten cycle times and leading to energy inefficiencies and environmental concerns.
Innovation Solution
A hybrid core driving device that combines hydraulic and electric power drives, utilizing a cylinder unit with a piston and screw shaft mechanism, and a separate hydraulic circuit with an accumulator and switching valve, allowing for independent operation and reduced hydraulic oil usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a hydraulic circuit is used to generate large driving force at low speed, then the initial stage operation is improved, but the device complexity increases and a large amount of hydraulic oil is required
Solution Approach 1:
The patent applies hydraulic principles by using a hydraulic cylinder and piston to generate large driving force during the initial stage of core insertion. The hydraulic circuit provides high force output when needed most, while the system design minimizes the amount of hydraulic oil required compared to conventional systems.
2Device complexity
If the hydraulic circuit is shared between mold clamping device and core driving device, then the device complexity is reduced, but the productivity decreases due to inability to perform operations simultaneously
Solution Approach 1:
The patent segments the hydraulic system into separate circuits: a first hydraulic circuit dedicated to the mold clamping device and a second hydraulic circuit dedicated to the core driving device. This segmentation allows both operations to occur simultaneously without interference, reducing cycle time and improving productivity while maintaining manageable system complexity.
3Force
If a large amount of hydraulic oil is used, then the driving force requirement is met, but the energy saving becomes difficult and working environment deteriorates
Solution Approach 1:
The patent uses partial hydraulic action by employing a hydraulic cylinder only for the initial stage of core insertion where large force is needed. After the initial insertion, the system transitions to electric motor-driven operation for the remaining行程, thereby reducing overall hydraulic oil consumption and improving energy efficiency while still meeting the force requirements when necessary.
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 hybrid core driving device achieves a significant reduction in hydraulic oil usage, simplifies the device structure, saves energy, reduces environmental impact from oil stains, and allows for faster cycle times by enabling simultaneous operations of core insertion and mold closing, and core retrieval and mold opening.
Implementation Method 1
a connection portion provided at the cylinder tube, the connection portion being connectable to a pipe supplying a hydraulic liquid operating the piston
Implementation Method 2
a screw shaft penetrating the second cover member and the nut, the screw shaft provided to be insertable into the rod and to be rotatable; a motor rotating the screw shaft
Data Source
AI summary
A hybrid core driving device of an embodiment includes: a cylinder tube; a first cover member at one end of the cylinder tube; a second cover member at the other end thereof; a rod in the cylinder tube, having a connecting portion at one end to be connectable to a core and an annular flange on the side of the second cover member, and penetrating the first cover member; a nut fixed to the rod; a screw shaft penetrating the second cover member and the nut and provided to be insertable into the rod; a motor rotating the screw shaft; a piston in the cylinder tube, allowing the rod to penetrate therethrough, and slidable with respect to the cylinder tube and the rod; and a connection portion connectable to a pipe supplying a hydraulic liquid to a region surrounded by the cylinder tube, the first cover member, and the piston.