TECH 343 Servo and Nonservo  Hydraulics

Experiment #5: Clamping and Cutting Circuit

Equipment

1. Vickers hydraulic training bench

2. Cylinders, vertical and horizontal

3. Directional valve

4. Sequence valve

5. Flow control valve

6. Pressure reducing valve

7. PC w/Labview program

Objectives

1. To design a clamp and cutting circuit with speed and force control.

2. To determine the effect of various pressure settings on the circuit performance.

3. To determine the effect of various cutting speeds and pressure settings on the circuit performance.

Procedure

1. Using items 1 through 3 construct a hydraulic circuit with the cylinders in series.

2. Set the relief valve for reasonable operation and appropriate pressures throughout the circuit. Observe the operation of this circuit through several cycles.

3. Using the same equipment construct a hydraulic circuit with the cylinders in parallel.

4. Repeat step 2.

5. Using items 1 through 4 construct a circuit with separate cylinder motions. The vertical cylinder should move first followed by the horizontal cylinder.

6. Operate the circuit and measure the pressures and times as appropriate.

7. Assume the vertical cylinder is performing a clamping action requiring a limited maximum force. Add the pressure reducing valve to the circuit to keep the vertical cylinder at some limiting pressure.

8. Repeat step 6.

9. Based on the circuit performance specify settings for the adjustable valves.

10. Assume the horizontal cylinder is to do a cutting operation. Add the flow control valve to the circuit to accomplish this.

11. Using the settings of step 9 vary the speed of the cylinders and determine the performance and effect on pressures.

12. Adjust the settings as necessary to obtain working systems for 3/4, 1/2, and 1/3 speed.

Questions

1. What features can you associate with the sequence and pressure reducing valves?

2. Include graphs of pressure versus reducer valve settings and velocity versus flow control valve settings.