Air Cylinders Model Selection 2000 1500 1000 500 400 300 200 150 100 50 40 30 20 15 10 54 3 2 1.5 1 0.6 5000 4000 3000 2000 1500 1000 500 400 300 200 150 100 50 3000 2000 1500 1000 500 400 300 200 150 100 50 40 30 20 15 10 54 3 2 1.5 1 0.5 0.4 0.3 0.2 0.15 0.1 0.05 0.04 0.03 0.02 0.015 0.01 3000 0.2 0.3 0.4 0.5 0.6 0.7 0.8 300 250 200 180 160 140 125 100 80 63 50 40 32 25 20 16 10 6 300 250 200 180 160 140 125 100 80 63 50 40 32 25 20 16 10 6 2 Best Pneumatics How to Obtain the Air Consumption/How to Read Graphs (20), (21) How to Obtain the Required Air Volume/How to Read Graph (22) In equipment that used a cylinder, air consumption is the volume of air that is consumed in the cylinder, or in the piping between the cylinder and the switching valve, every time the switching valve operates. This is necessary for selecting a compressor and for calculating the running cost. The required air volume is the volume of air that is necessry for operating a specified load at a specified speed, and it is necessary for selecting the F.R.L equipment or the size of the upstream piping. Obtain the cylinder’s air consumption and its required air volume. Step 4 Cylinder’s air consumption and its required air volume. Step 1 Step 2 Step 3 Step 3 Graph (20) Cylinder’s Air Consumption (For one cycle) Cylinder stroke (mm) Air consumption (L (ANR)) Air consumption (L (ANR)) Operating pressure (MPa) Bore size (mm) Note) In selecting a compressor, the temperature drop, leakage, and consumption by the intermediary equipment must be taken into consideration. Thus, select one with a generous capacity, with a discharge that exceeds the total air consumption indicated above. (Reference: At a minimum, select one with 1.4 times the volume; select one with a higher volume as needed.) Example: When 10 air cylinders with a 50 mm bore size and a 600 mm stroke are used at a pressure of 0.5 MPa, what is the air consumption of their 5 cycles per minute? (A 2 m tube with a 6 mm bore is used for piping between the cylinders and the switching valve.) By using Graph (20), obtain the air consumption of the air cylinder. q Seek the point at which the operating pressure (diagonal line) intersects with the cylinder stroke, and from that point, perpendicularly extend a vertical line upward. w From the point at which it intersects with the bore size (diagonal line) of the cylinder to be used, look sideways (eithr to the right or left) to obtain the air consumption that is required by one cycle of the air cylinder. Obtain the total air consumption per minute as described below. (Air consumption of air cylinder + Air consumption of tube or steel pipe) x Number of cycles per minute x Number of cylinders being used = Total air consumption [Unit: L/min (ANR)] By using Graph (21), obtain the air consumption of the tube or steel pipe in the same way as in Step 1. By using Graph (22), obtain the air cylinder’s required air volume. q Seek the point at which the operating pressure (diagonal line) intersects with the cylinder stroke, and from that point, perpendicularly extend a vertical line upward. w From the point at which it intersects with the bore size (diagonal line) of the cylinder to be used, look sideways (eithr to the right or left) to obtain the air consumption that is required by one cycle of the air cylinder. Example:What is the required air volume for operating a cylinder with a bore size of 50 mm, at pressure of 0.5 MPa, and at a speed of 500 mm/s? How to read: Operating pressure 0.5 MPa → Maximum piston speed 500 mm/s → Bore size 50 mm → Then, a required air volume 350 L/min (ANR) can be obtained. 1. Operating pressure 0.5 MPa → Cylinder stroke 600 mm → Bore size 50 mm → Air consumption . 13 L (ANR) 2. Operating pressure 0.5 MPa → Piping length 2 m → Bore 6 mm → Air consumption . 0.56 L (ANR) 3. Total air consumption = (13 + 0.56) x 10 x 5 = 678 L/min (ANR) Front matter 36