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# Pneumatic Cylinders 1

Apr 05, 2018

## Documents

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Step

Obtain the bore of the cylinder tube. Refer to Graphs 1 and 2.

qDetermine the load factor in accordance with the purpose.

Purpose of operation

Static operation (clamping, low speed vise crimping, etc.)

Dynamicoperation

Horizontal movement of load on guide

Vertical and horizontal movement of the load

0.7 or less(70% or less)

1 or less(100% or less)

0.5 or less(50% or less)(1)

Note 1) If it is particularly necessary to operate at high speeds,the load rate must be reduced further. (In the graph, it ispossible to select a load rate of 0.4, 0.3, 0.2, or less.)

wDetermine the operating pressure.

Generally, set the regulator to 85% of the source air pressure.

(In the graph, a selection between 0.2MPa and 0.8MPa is possible.)

eDetermine the direction in which the cylinder force will be used.

Extending side Refer to Graph 1.

Retracting side Refer to Graph 2.

Note: If the same load is applied both for pushing and pulling in ahorizontal operation, set the direction to the pulling side.

Take the impact at the stroke end into consideration.

qWhen an external stopper (shock absorber, etc.) is provided to

absorb the impact, select a stopper with sufficient absorption capacity.

wStopping the piston with the cylinder without a stopper:

Verify in Graphs 3 to 7 the absorption capacity of the cushion that is

enclosed in the cylinder.

1) Rubber bumper: Urethane rubber is used for preventingmetal-to-metal contact between the pistonand the cover.

2) Air cushion: The air in the exhaust side is compressedslightly before the stroke end, and its reactionforce absorbs the kinetic energy of the load,thus enabling the piston to stop quietly.

The aspects indicated below may need to be taken into

consideration, depending on how the cylinder is operated.qIf a lateral load is applied to the piston rod:

Verify in Graphs 8 to 11 whether the lateral load is within an allowable

range.

wWhen using a cylinder with a relatively long stroke, if a buckling force

acts on the piston rod or the cylinder tube, verify in the table whether

the stroke or the operating pressure is within a safe range.

Obtain the cylinder's air consumption and required air volume.

Obtain the air consumption (Graphs 12, 13) that is necessary forselecting a compressor and for calculating the running cost and the

required air volume (Graph 14) that is necessary for selecting equipment

such as an air filter or a regulator, or the size of the piping upstream.

Technical data for air cylinders

For detailed technical data other than the air cylinder model

selection procedure, refer to p.5.6-1 to 5.6-8.

Data 1: Tube Bore Selection (p.5.6-2 to 5.6-5)

Data 2: Air consumption and Required Air volume (p.5.6-6)

Data 3: Theoretical Force Table (p.5.6-7 and 5.6-8)

1

Step

2

Step

Step

3

4

Series MB

Series CJ2

Series CM2

Series CG1

Series CA1

Series CS1

Series CQ2

Air Cylinder Model Selection Procedures

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Air Cylinder Model Selection Procedures

Obtain the bore of the cylinder tube. Refer to Graphs 1 and 2.

Example 1: If a minimum force of 1000N is necessary to keep theworkpiece pressed as shown in Fig. 1, because this is the

extending side, use Graph 1 to determine the load factor of 0.7and the operating pressure of 0.5MPa. Then, seek the pointat which the cylinder force of 1000N intersects, and this willresult in a bore size of 63mm.

Example 2: To move a load with a 30kg weight horizontally on a guide asshown in Fig. 2, because the load is the same for both thepushing and retracting sides, use Graph 2, which is theretracting side with a smaller force. Determine the load factorof 1, and the operating pressure of 0.4MPa. Then, seek the

point at which it intersects with the load weight of 30kg, andthis will result in a bore size of 40mm.

Example 3: To pull a load with a 100kg weight vertically upward as shown

in Fig. 3, use Graph 2 to determine the load factor of 0.5 andthe operating pressure of 0.5MPa. Then, seek the point at whichit intersects with the load weight of 100kg, and this will result ina bore size of 80mm.

Conversion to gravitational units

1MPa 10.2kgf/cm2 1N 0.102kgf1kgf/cm20.098MPa 1kgf 9.8N

Step

1

P=0.4MPa

W

Fig. 2

30kgP=0.5MPa

Fig. 3

W

100kg

Fig. 1

P=0.5MPa

Example: Example:

600005000040000

300002500020000

15000

10000

50004000

300025002000

1500

1000

500400

300250200

150

100

5040

302520

15

10

54

32.5

2

1.5

10.80.8

0.70.6

0.50.4

0.3

0.2

600050004000

300025002000

1500

1000

500400

300250200

150

100

5040

302520

15

10

54

32.52

1.5

1

0.50.4

0.30.250.2

0.15

0.10.08

CylinderforceF(N)

Operatingpressure(MPa)

300250

200180160140125

100

80

63

50

40

32

25

20

16

10

6

300250

200180160140

125

100

80

63

50

40

32

25

20

16

10

6

1 0.70.5

0.40.3

0.2

Retracting side cylinder force (Double acting cylinder)

Bore size (mm)

600005000040000

300002500020000

15000

10000

50004000

300025002000

1500

1000

500400

300250200

150

100

5040

302520

15

10

54

32.5

2

1.5

10.8

0.70.6

0.50.4

0.3

0.2

600050004000

300025002000

1500

1000

500400

300250200

150

100

5040

302520

15

10

54

32.52

1.5

1

0.50.4

0.30.250.2

0.15

0.1

CylinderforceF(N)

Operatingpressure(MPa)

300

250

200180160140125

100

80

63

50

40

32

25

20

16

10

6

300

250

2001801601401

25100

80

63

50

40

32

25

20

16

10

6

1 0.70.5

0.40.3

0.2

Extending side cylinder force (Double acting cylinder)

Bore size (mm)

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Take the impact at the stroke end into consideration.

How to view the Graphs

Example 1: According to Graph 3, to move a load weight of 50kg using CM2-40A, it is necessary to set the maximum speed at

300mm/s or less, considering the capacity of the air cushion.

Cylinder with an air cushion

CJ2

CM2

CG1

CA1

CS1

Step

2

200

100

50

30

20

10

5

3

2

1

0.4

0.3

0.2

100 200 300 500 1000

Max. speed (mm/s)

Series CJ2/CM2

CM2-40

CM2-32

CM2-25

CM2-20

CJ2-16

CJ2-10

1000

500

300

200

100

50

30

20

10

5

3

2

1

0.5

Max. speed (mm/s)

Series CG1CG1-100

CG1-80

CG1-63

CG1-50

CG1-40

CG1-32

CG1-25

CG1-20

10000

5000

3000

2000

1000

500

300

200

100

50

30

20

10

5

100 200 300 500 1000100 200 300 500 1000

Max. speed (mm/s)

Series CA1/CS1

CS1-300

CS1-250

CS1-200

CS1-180

CS1-160

CS1-140CS1-125

CA1-100

CA1-80

CA1-63

CA1-50

CA1-40

Air Cylinder Model Selection Procedures

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Example 2: According to Graph 7, to move a load weight of 50kg at a maximum speed of 500mm/s, in the CG1 series, a bore size

of 80 can be selected.

Cylinder with a rubber bumper

MB

How to view the Graphs

CJ2

CM2

CG1

200

100

50

30

20

10

5

3

2

1

0.4

0.3

0.2

0.1

0.05

100 200 300 500 750 1000

Max. speed (mm/s)

Series CJ2/CM2

CM2-40

CM2-32

CM2-25

CM2-20

CJ2-16

CJ2-10

CJ2-6

1000

500

300

200

100

50

30

20

10

5

3

2

1

0.5

100 200 300 500 1000

Max. speed (mm/s)

Series CG1CG1-100

CG1-80

CG1-63

CG1-50

CG1-40

CG1-32

CG1-25

CG1-20

1000

500

300

200

100

50

30

20

10

5

4

3

2

100 200300 500 1000 2000

Max. speed (mm/s)

Series MB

MB100

MB80

MB63

MB50

MB40

MB32

Air Cylinder Model Selection Procedures

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Bushing (Bearing)fR

The aspects indicated below may need to be taken into consideration, depending on how the cylinder is operated.

qThe maximum stroke at which the cylinder can be operated under a lateral load.The region that does not

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