Ram Position Detection via Cylinder Integration
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Solution Overview
Problem
Conventional fluid pressure machines for press machines face limitations in achieving high-velocity movement of rams while maintaining low-velocity pressurization operations, restricting design freedom and efficiency due to fixed pressure reception area ratios and requiring expensive linear sensors for accurate position detection.
Innovation Solution
The proposed solution involves a ram driving method and apparatus where a large-diameter cylinder and small-diameter cylinder are integrated, with a large-diameter piston rod fixed to the ram and a small-diameter piston rod connected to a motor-driven moving member, allowing the cylinders to communicate and move together, enabling high-velocity ram movement and low-velocity pressurization by adjusting fluid flow rates and using a counterbalance valve to manage pressure differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional fluid pressure machine uses a large-diameter cylinder and small-diameter cylinder with fixed pressure reception area ratios, then the system can maintain stable pressure control, but the design freedom is restricted and the ram velocity cannot be independently optimized
Solution Approach 1:
The invention divides the cylinder system into two independent cylindrical units: a large-diameter cylinder for pressurization and a small-diameter cylinder for positioning. Each cylinder has its own piston and can operate independently, allowing separate optimization of pressurization capability and positioning accuracy without being constrained by fixed pressure reception area ratios.
2Productivity
If the working fluid is simply filled into the large-diameter cylinder compartments, then the system structure is simple, but it takes a relatively long time to raise the internal pressure to desired levels
Solution Approach 1:
The system pre-fills the large-diameter cylinder compartments with working fluid before operation. This preliminary preparation ensures that when pressurization is needed, the fluid is already in position and can be pressurized immediately, eliminating the time delay associated with filling during operation.
3Measurement precision
If a linear sensor is arranged between the fixing unit and the large-diameter cylinder for accurate position detection, then the position can be detected accurately, but the system cost increases significantly
Solution Approach 1:
The invention uses a rotary encoder on the small-diameter cylinder as a substitute for expensive linear sensors. By detecting the rotational position of the small-diameter cylinder and using the known mechanical relationship between the two cylinders, the system calculates the position of the large-diameter cylinder indirectly, achieving accurate position detection at lower cost.
4Speed
If the large-diameter piston rod is fixed to the fixing unit and the large-diameter cylinder is moved, then the position detection is easier, but the ram cannot move at high velocity equal to the motor-driven member
Solution Approach 1:
Instead of fixing the large-diameter piston rod to the fixing unit and moving the cylinder, the invention inverts the configuration by fixing the large-diameter cylinder to the fixing unit and moving the large-diameter piston rod. This allows the ram to move at high velocity while the position is detected through the rotational position of the small-diameter cylinder.
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 allows for high-velocity ram movement equal to the motor-driven member, efficient pressurization with strong force, and accurate position detection without the need for expensive sensors, enhancing design flexibility and operational efficiency.
Implementation Method 1
a small-diameter piston 7P reciprocably included in a small-diameter cylinder 7... moving the large-diameter piston rod 5R and the ram 3 with a strong force by a working fluid supplied from the small-diameter cylinder 7
Implementation Method 2
a ball screw mechanism 105 rotation-driven by a motor M such as a servo motor... a piston rod 103R provided on one side of the small-diameter piston 103P integrally is connected to a moving member 107 such as a ball nut reciprocably provided in a ball screw mechanism 105
Data Source
AI summary
A ram driving method including the steps of fixing one end of a large-diameter piston rod integral with a large-diameter piston reciprocably included in a large-diameter cylinder attached integrally to a ram to a fixing unit, connecting one end of a small-diameter piston rod integral with a small-diameter piston reciprocably included in a small-diameter cylinder integral with the large-diameter cylinder to a moving member moved by a motor driving, integrally moving the small-diameter cylinder and the small-diameter piston and communicating a first compartment and a second compartment of the large-diameter cylinder divided by the large-diameter piston with each other, moving the ram integrally with the small-diameter piston rod moved by the moving member, and communicating the small-diameter cylinder with the large-diameter cylinder, thereby moving the large-diameter cylinder with a strong force by a working fluid supplied from the small-diameter cylinder.