Hydraulic Circuit for Cold Chamber Die Casting Machine
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Solution Overview
Problem
Existing cold chamber die casting machine hydraulic circuit arrangements face limitations in applying high pressures due to check valves that reduce flow cross-section and increase manufacturing and maintenance costs.
Innovation Solution
A hydraulic circuit arrangement that omits check valves by using a controllable first control valve to block fluid feedback and connects the accumulator directly to the pressure booster piston chamber, allowing higher pressures to be applied during the first and second phases without additional mechanical components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If a check valve is arranged in the line connection between the accumulator and the working cylinder piston chamber to prevent hydraulic fluid feedback in the third phase, then the pressure intensifier can increase the pressure in the working cylinder piston chamber, but the check valve reduces the flow cross-section during the first and second phases and thus reduces the pressure that can be reached in the working cylinder piston chamber
Solution Approach 1:
The invention extracts and removes the check valve from the hydraulic circuit. By eliminating this component entirely, the system achieves full flow cross-section during the first and second phases, allowing higher pressure to be reached in the working cylinder piston chamber without the flow restriction that check valves inherently impose.
Solution Approach 2:
The invention introduces a controllable control valve as an intermediary element that replaces the passive check valve. This active valve provides bidirectional control, allowing the system to prevent hydraulic fluid feedback during the third phase while maintaining full flow capacity during the first and second phases, thus mediating between the conflicting requirements of pressure buildup and flow efficiency.
2Reliability
If a check valve is arranged in the line connection to prevent hydraulic fluid feedback, then the pressure intensifier can function in the third phase, but the check valve requires regular servicing and replacement
Solution Approach 1:
The invention extracts and removes the check valve from the hydraulic circuit. By eliminating this component entirely, the system achieves full flow cross-section during the first and second phases, allowing higher pressure to be reached in the working cylinder piston chamber without the flow restriction that check valves inherently impose.
Solution Approach 2:
The invention introduces a controllable control valve as an intermediary element that replaces the passive check valve. This active valve provides bidirectional control, allowing the system to prevent hydraulic fluid feedback during the third phase while maintaining full flow capacity during the first and second phases, thus mediating between the conflicting requirements of pressure buildup and flow efficiency.
3Reliability
If the pressure intensifier has a valve seat movably mounted to form a blocking valve, then hydraulic fluid feedback is prevented in the third phase, but the manufacturing costs and maintenance costs of the pressure intensifier are increased
Solution Approach 1:
The invention segments the hydraulic circuit into two separate line connections: one from the accumulator to the working cylinder piston chamber, and another from the accumulator to the pressure intensifier piston chamber. This segmentation allows independent control of each path, eliminating the need for a movable valve seat in the pressure intensifier while achieving the same feedback prevention function through the controllable control valve in the first line connection.
Solution Approach 2:
The invention introduces a controllable control valve as an intermediary element that replaces the passive check valve. This active valve provides bidirectional control, allowing the system to prevent hydraulic fluid feedback during the third phase while maintaining full flow capacity during the first and second phases, thus mediating between the conflicting requirements of pressure buildup and flow efficiency.
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
This solution enables higher forces to be applied to the working cylinder piston rod, allowing for the production of larger and more delicate components with reduced manufacturing and maintenance costs, and faster shot-in times.
Implementation Method 1
an accumulator (10) for providing a hydraulic fluid
Implementation Method 2
a pressure intensifier (30) having a pressure intensifier piston space (31) and a pressure intensifier rod space (32) for increasing the pressure in the working cylinder piston space (21)
Data Source
Figure 1
AI summary
The invention relates to a hydraulic circuit arrangement for a cold chamber die-casting machine for the production of metal components, comprising a battery (10) for providing a hydraulic fluid, a working cylinder (20) having a working cylinder piston chamber (21), a line connection having a first controllable control valve (41) via which the battery (10) can be connected to the working cylinder piston chamber (21), a pressure intensifier (30) having a pressure intensifier piston chamber (31) and a pressure intensifier rod chamber (32) for increasing the pressure in the working cylinder piston chamber (21), and a line connection via which the battery (10) can be connected to or is connected to the pressure intensifier piston chamber (31), characterized in that the first control valve (41) has a closed position and a flow position.that in the line connection (11) between the accumulator (10) and the working cylinder piston chamber (21) behind the first control valve (41) there are no internal components for closing the line connection (11), so that backflow of the fluid from the working cylinder piston chamber (21) can be prevented by closing the first control valve (41), and that the accumulator (10) is connected or connectable to the pressure intensifier piston chamber (31) by means of a line connection (12) parallel to the first control valve (41), through which the pressure intensifier piston chamber (31) can be pressurized during the pressure increase.