Festo DYSC-…-Y1F - Handbuch (Seite 3)

Shock absorber DYSC-…-Y1F English . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1 Function and application
The DYSC shock absorber is filled with hydraulic oil. The impact of the working load
causes the oil to be displaced via a path-dependent restrictor. The kinetic energy is
converted into thermal energy. A compression spring resets the piston rod.
The DYSC has been designed for cushioning mass forces. It is intended exclusively
for cushioning forces in an axial direction. The DYSC also functions as a stop within
the permitted loading limits.
The DYSC is
not intended for use in moist environments.
2 Requirements for product use
Note
Improper handling can result in malfunctions.
• Be sure to always comply with the specifications in this chapter.
• Compare the limit values specified in these operating instructions with your
actual application (e.g. forces, frequencies, masses, temperatures, speeds).
Operation of the DYSC in compliance with the relevant safety regulations is
contingent on adherence to the load limits.
• Observe the prevailing environmental conditions on site.
• Observe the regulations applicable to the place of use (e.g. of trade
associations or national institutions).
• Use the DYSC in its original state. Unauthorized product modification is not
permitted.
3 Installation
• Select the installation variant for your application.
Drill hole Thread (through)
Fig. 4
If the permitted impact force is exceeded:
• Use an additional fixed stop with the shock absorber.
• Fit the DYSC into position with regard to the following:
– The working load should strike as flatly against the fixed stop as possible 5
( Fig. 1).
– The working load should strike as axially against the buffer as possible 1
( Fig. 1), (max. deviation: 5° Fig. 2).
– The permitted torque on the internal hexagon 4 ( Fig. 1) must not be
exceeded ( Table Fig. 5).
• Tighten the lock nuts 3 ( Fig. 1) in accordance with the fastening method
selected. The following tightening torque must be observed here:
DYSC 4-4 5-5 7-5 8-8 12-12 16-18 20-18 25-25
Perm. torque 4 [Nm] 0,5 0,8 2,2 5 13 20 20 25
Max. tightening torque 3 [Nm] 1 2 3 5 20 35 60 80
Fig. 5
4 Commissioning
• Observe the permissible values for:
– The insertion force (F
2
) ( Technical data Fig. 8)
– The resetting force (F
1
) ( Technical data Fig. 8)
Fig. 6
This insertion force (F
2
) must be applied
at the very least in order for the shock
absorber to be pressed accurately into
the rear end position. This value will be
reduced accordingly if there is an external
upstream end position.
The resetting force (F
1
) must be applied
at maximum to the piston rod in order for
the shock absorber to extend to its full
length (e.g. upstream bolt).
• First, start a test run of the moveable working load at reduced operating speed.
During the test run:
• Accelerate the effective load in steps until the operating speed is reached.
Please refer to the calculations for your application. If the end position is set
correctly, the piston rod of the shock absorber will reach the end position
(fixed stop) without striking hard against it.
5 Operation
If the operating conditions are modified:
Note
Modifications to the effective load may cause the working load to strike hard
against the end position (load peaks).
• Repeat the setting of the DYSC (
Chapter “Commissioning”).
Hard knocking requires the following remedy:
• Reduce the impact speed; measure the cushioning length (s) (
Fig. 3) as a
check ( Technical data Fig. 8). Insufficient cushioning indicates a consider-
able loss of oil. In this case the DYSC must be replaced.
Maximising the service life of the DYSC:
If the shock absorber is not used to its full extent, there will be an increase in the
oil leakage.
• Make sure that the shock absorber is operated with an energy utilisation of at
least 25 % to max. 100 %. The recommended range lies between 50 and 80 %.
• Make sure that the DYSC is utilized as follows:
0 25 50 80 100 125 %
D B B C A
A = unfavourable
B = permissible
C = optimal
D = impermissible
Fig. 7
• Take into account that the viscosity of the hydraulic oil diminishes during
operation due to the frictional heat which arises.
The shock absorber can therefore break through after a long period of operation.
At temperatures below 0 °C:
• Note that the reset times of the DYSC become longer (approx. 1 s).
Low temperatures cause an increase in the viscosity of the hydraulic oil.
6 Maintenance and care
• Check the oil loss on the DYSC approximately every 2 million load changes.
At the same time, it is recommended to check the cushioning length (s)
(
Fig. 3) of the DYSC.
Otherwise the DYSC does not require any maintenance.
7 Disassembly and repairs
• Observe environmental protection requirements when disposing of the DYSC
(material recycling). The DYSC is filled with hydraulic oil.
Due to the design, the hydraulic oil cannot be refilled.
8 Accessories
Note
• Please select the appropriate accessories from our catalogue
www.festo.com/catalogue
9 Technical data
DYSC 4-4 5-5 7-5 8-8 12-
12 16-
18 20-
18 25-
25
Cushioning length (s) ( Fig. 3) [mm] 4 5 5 8 12 18 18 25
Mode of operation Single-acting, pushing
Cushioning Self-adjusting
Mounting position Any
Thread M6 M8 M10 M12 M16 M22 M26 M30
Lead [mm] 0.5 1 1 1 1 1.5 1.5 1.5
Width across flats
Internal hexagon [mm] 2 2.5 3 4 5 5 6 8
Lock nut [mm] 8 10 13 15 19 27 32 36
Impact speed [m/s] 0.05 … 2 0.05 … 3
Product weight [g] 5 9 17 36 81 210 370 575
Ambient temperature [°C] -10 … +80
Reset time at ambient temperature [s] ≤ 0.2 ≤ 0.3
Resetting force F 1 [N] 0.7 0.9 1.2 2.5 5 6 10 14
Insertion force F 2 [N] 6.5 7.5 10 18 35 60 100 140
Max. stop force in end position [kN] 0.1 0.2 0.3 0.5 1 2 3 4
Max. energy absorption per stroke
1)
[J] 0.6 1 2 3 10 25 38 100
Max. energy absorption per hour 1) [kJ] 5.6 8 12 18 36 50 80 140
Max. working load
1)
[kg] 1.2 1.5 5 15 45 70 100 160
Information on materials
Housing High-alloy steel Galvanised steel
Piston rod High-alloy steel
Buffer Polyacetate, polyamide
Seals Nitrile rubber
1) The specified technical data refers to ambient temperature. At higher temperatures in the 80 °C range,
the max. working load and the energy absorption must be reduced by approx. 50 %.
Fig. 8