Configuring The Hydraulic Drive - Siemens Sinumerik 840D Series Function Manual

2 Configuration

2.3 Configuring the hydraulic drive

2.3 Configuring the hydraulic drive
General
2.3.1 Cylinder selection
Piston and rod
diameter
Stroke length
2-30
Hydraulic drives are generally configured by technical sales personnel from the
hydraulics supplier, Rexroth.
The configuration is based on the data from the questionnaire in
Subsection 2.1.2 .
Please refer to Appendix A for a description of hydraulic components.
The hydraulic drive is configured in the sequence of steps described below.
The piston and rod diameters are calculated according to Pascal's theorem on
the basis of the necessary compressive and tensile forces F and a standard
pressure value of P=40...100 bar for machine tools (a maximum pressure set-
ting of 350 bar is permitted).
p =
The force value calculation must include friction and acceleration forces
as well as the actual feed force. Pistons and rods with the following standard
diameter dimensions are available:
Table 2-2 Typical cylinder data
Description
Piston ∅
25
Rod ∅ Standard
12
Rod ∅ Optional
18
The stroke is identical to the working stroke of the drive except that
it includes a few additional safety reserves.
SINUMERIK 840D/SIMODRIVE 611 digital, HLA Module (FBHLA) - 10.03 Edition
F
O
Diameter
32 40 50 63
14 18 22 28
22 28 36 45
 Siemens AG, 2003. All rights reserved
10.03
80 100 125
36 45 56
56 70 90