Hydraulic Circuit Simplification in Fineblanking Press
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Solution Overview
Problem
Existing hydraulically driven fineblanking presses have complex hydraulic circuits with multiple lines, leading to high cycle times and low stroke rates due to separate hydraulic circuits for the main piston and rapid traverse piston, resulting in inefficient fluid management and reduced productivity.
Innovation Solution
The solution simplifies the hydraulic circuit by allowing hydraulic fluid to be displaced from one pressure chamber to another during the rapid traverse stroke, using disk-like working surfaces on the main piston to connect upper and lower pressure chambers via bypass channels, and employing pressure-controlled valves to manage fluid flow, reducing the need for separate hydraulic lines and optimizing fluid use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If separate hydraulic circuits are used for main piston and rapid traverse piston, then each piston can be controlled independently, but the hydraulic circuit becomes complex with multiple lines and high cycle times
Solution Approach 1:
The patent combines the hydraulic circuits for the main piston and rapid traverse piston into a single integrated circuit. The main piston's pressure chambers serve dual purposes: powering both the main piston movement and the rapid traverse piston movement. This merging eliminates the need for separate hydraulic lines while maintaining independent control capability through strategic placement of control valves.
Solution Approach 2:
The pressure chambers of the main piston are designed to serve multiple functions: they provide hydraulic power for the main piston's cutting stroke and simultaneously serve as the power source for the rapid traverse piston's quick positioning movement. This multi-functionality reduces the overall hydraulic system complexity while maintaining operational independence.
2Ease of operation
If separate hydraulic circuits are used for main piston and rapid traverse piston, then each piston can be controlled independently, but the cycle time increases and stroke rate decreases
Solution Approach 1:
The integrated hydraulic circuit enables continuous operation by allowing the main piston to drive the rapid traverse piston during the cutting stroke phase. The hydraulic fluid is continuously circulated and reused within the system rather than being discharged and requiring replenishment, maintaining uninterrupted operation and reducing cycle time.
Solution Approach 2:
Instead of discarding hydraulic fluid after use in separate circuits, the system recovers and reuses the hydraulic fluid from the main piston's pressure chambers to power the rapid traverse piston. This recovery and reuse mechanism eliminates wasted fluid cycles and improves overall system efficiency and productivity.
3Ease of operation
If separate hydraulic circuits are used, then fluid management is simplified for each piston, but the total amount of hydraulic fluid required increases
Solution Approach 1:
The patent merges the hydraulic fluid systems into a single shared circuit where the same hydraulic fluid serves both the main piston and rapid traverse piston. This eliminates the need for separate fluid reservoirs and supply lines for each piston, reducing the total hydraulic fluid volume required while maintaining adequate fluid management through centralized control.
4Ease of operation
If complex hydraulic circuits with multiple lines are used, then independent piston control is achieved, but system efficiency decreases
Solution Approach 1:
The patent merges the hydraulic circuits to eliminate redundant lines and components, reducing pressure losses and improving system efficiency. The integrated design allows direct transfer of hydraulic power from the main piston to the rapid traverse piston without requiring separate pump systems and extensive piping, thereby enhancing overall system efficiency while maintaining independent control through valve management.
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 configuration reduces the amount of hydraulic fluid required, increases the number of strokes, and enhances the efficiency of the press operation by allowing rapid traverse and power strokes with optimized fluid management, thereby improving productivity and cycle time.
Implementation Method 1
the first fluid channels being connected to the second fluid channels by a bypass channel each arranged in the base... allowing hydraulic fluid to be displaced from one pressure chamber to another during the rapid traverse stroke
Implementation Method 2
employing pressure-controlled valves to manage fluid flow
Data Source
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AI summary
The invention relates to a device and a method for controlling the main drive of a hydraulically driven fineblanking press. The object of the invention is to provide a device and a method for controlling the main drive of a hydraulically driven fineblanking press whose hydraulic circuitry can be simplified by eliminating hydraulic lines, and the amount of hydraulic fluid can be reduced while simultaneously increasing the stroke rate and using a simpler press design. This object is achieved by the main piston (20) having disc-shaped projecting working surfaces (22a, 22b) which, superimposed in the main cylinder chamber (19), divide the first (upper) and second (lower) pressure chambers (23a, 23b) with a small stroke, to which first (upper) fluid channels (24a, 24b, 24c, 24d) and second (lower) fluid channels (24e, 24f, 24g, 24h) connected to the hydraulic system (18) are assigned in the base (5).wherein the fluid channels (24a to 24d) are connected to the fluid channels (24e to 24f) by a bypass channel (26) arranged in the base (5), which forms an internal hydraulic system with these channels (24a to 24h) and the pressure chambers (23a, 23b), which is opened during rapid traverse by pressure-controlled proportional valves (25a, 25b, 25c, 25d) when the hydraulic fluid is displaced from the first to the second pressure chamber (23a, 23b) and closed during the power stroke, and wherein during the power stroke at least one second fluid channel is a power stroke channel and the first pressure chamber (23a) is connected to a relief channel (29), wherein this fluid channel is connected to supply hydraulic fluid of a predetermined pressure to the second pressure chamber (23b) by means of a supply channel (32) and a branch channel (33) and the relief channel (29) to The hydraulic fluid displaced from the first pressure chamber (23a) is discharged via a tank valve (30) connected to a collection tank (44).