Ingeniero

Projecting instructions for
speed controls
using switching directional valves
1.6

Projecting Data Sheet

Designation:

Identification:
Feed drive left

Actuator

Function

Symbol/installation position/nominal size/
port designations/speed cycle

Working values
Flow
Idling pressure
s
t
F
v
Q1
Q2
pZ1
pZ2
in mm in s in kN in mm/min in L/min in L/min in bar in barHalt

down

–

–

0

0

0

0

0

0

EV

400

6

0

4000

20.1

16

10

0

AV

50

20

5

150

0,8

0.6

5

0

ER

2 Ø80/36x630 1

A2

ER

EV

A1

up

AV

Z1

450

6

0

4500

22.6

18

0

15

F
A1 = 50.3 cm2

A2 = 40.1 cm2

Other data and requirements

Preliminary control selection to Fig. 12/3:
No. 4Moved mass (including counterweights):

m=

1000 kg

Pipe dimensions:

dext x th x L =

15x1.5x3000 mm 1.5x1.5x3000

System pressure:
p0 =

50 bar

Stroke volume/line ratio:
VS/VL
≥

1.25

5.3

Speed/load characteristics:
|∆vAV/vAV|max
≤±5%

± 2.5

Speed/temperature characteristics:
(∆vAV/vAV)± 5 K
≤±5%
≤ ± 10 %

(∆vEV/vEV)± 5 K

50

0

A

C

T

aNo data

Start-up jump:
|∆x|

N/µm

b

32.2

≤ 1.5 mm

1.23

Acceleration and deceleration:
≤ 15 m/s2
|a|max

13.7

Changeover accuracy:
F1
≤ ± 5 mm

± 2.69

Flow control valve type: 2FRM6B

F2

Given specification

± 0.15

4WE62
not available

Solenoid voltage:

24 V DC

Fluid:
≤ ± 0.5 mm

Direct. valve f. rapid speed:
Counterbalance:

Positioningaccuracy:

HLP 68

Operating temperature:

50 °C ± 5 K

Calculated or selected parameters

Mannesmann Rexroth GmbH
D-97813 Lohr am Main • Tel. (0 93 52) 18-0

RE 48 005/01.96

B

P

± 2.5

Static stiffness:

Status: 01/96

1

Foreword
The objective of the present projecting instructions is to put the expert reader
into a position to calculate important technical datafor a complete drive on
the basis of given technical specifications and thus to be able to project a
hydraulic speed control with switching directional valves.

These projecting instructions mainly refer to translatory
drives. However, the contents can also be applied to rotary
systems without any difficulty.
These instructions assume that a hydraulic actuator is available as part of
thespeed drive and does therefore only focus on the design and rating of
speed controls.

2

RE 48 005/01.96

Foreword

2

Table of contents

3

1. Projecting documentation

5

1.1 Function chart of machines and production systems

5

1.2 Parts placement diagram

6

1.3 Travel/time diagram

7

1.4 Speed/time diagram

8

1.5 Speed/travel diagram

9

1.6Projecting data sheet

10

1.7 Function table

11

2. Definitions

12

3. Speed controls

13

3.1 General systematics

13

3.2 Important standard components

15

3.2.1 2-way flow control valves

15

3.2.2 Counterbalance valves

21

3.2.3 Directional valves with switching delay

25

3.3 Series and parallel connection

26

3.3.1 Criteria for the design of circuits26

3.3.2 Preliminary selection of controls

28

RE 48 005/01.96

3

4. Static technical data
4.1 Flow/pressure requirements

29
29

4.1.1 Speeds

29

4.1.2 Maximum flow

29

4.1.3 System pressure required at rapid speeds

30

4.1.4 Minimum flow control valve flow

31

4.1.5 System pressure required at working speeds and
under external force

32

4.2 Strokevolume/line ratio

33

4.3 Speed/load characteristics

34

4.4 Speed/temperature characteristics

35

4.5 Static stiffness

38

5. Technical data for changeover characteristics

40

5.1 Start-up jump

41

5.2 Acceleration and deceleration

45

5.3 Changeover and positioning accuracy

47

6. Projecting steps and preliminary selection of the control

50

7....