Sin- Cylinders Use And Maintenance Instruction - SMW Autoblok SIN-S Serie Manual De Instalación, Uso Y Mantenimiento

1. GENERAL
1.1 SIN- hydraulic cylinders are the most advanced on the market as re-
gards to speed, safety, and reliability; they have all the safety condi-
tions required by the Berufsgenossenschaft and by international regu-
lations.
1.2 SAFETY VALVES. SIN- cylinders have two inbuilt non-return valves
which can be inspected from the outside. They maintain the pressure
in the chambers even in the case of reduction or interruption in oil
pressure. (The minimum required pressure is 5 bar.)
1.3 PRESSURE RELIEF VALVES. In each SIN- cylinder chamber there is
a maximum pressure valve rated at 85 bar, which opens automatically
in case of overpressure.
1.4 PISTON STROKE CONTROL. The piston stroke control system can
be fitted on the rear of the cylinder, by means of proximity switches
(not supplied).
1.5 VERY HIGH AXIAL TRAVEL SPEED OF THE PISTON.
SIN- cylinders, have a rotating manifold, with well dimensioned oil
feed ports and a high pressure feed of up to 70 bar enabling the
piston to make a complete stroke in about 1 sec: they are perfectly
suited to mass production.
1.6 HIGH WORKING PRESSURE UP TO 70 BAR.
Working at high pressure permits a high traction force, with reduced
overall dimensions, weight and inertia of the cylinder.
1.7 MOUNTING WITH REAR SCREWS.
The SIN- cylinders can be mounted by means of rear screws (see
solution 1 of fig. 2), that allow in many applications mounting of the
cylinder directly onto the pulley, therefore, much closer to the rear
bearing of the spindle (also eliminating the need for an intermediate
adaptor).
1.8 CENTRAL THRU-HOLE FOR COOLANT OR AIR.
All SIN- cylinders have a central hole of 12.5mm for coolant or air to
pass through and are designed to accept a DEUBLIN rotating unit
mounted directly on the rear side of the piston rod.
1.9 The hydraulic rotating cylinder is packed with great care prior to de-
spatch and is therefore safe from any damage caused by ordinary
loading, transport and unloading. The external metal parts are coated
with suitable anticorrosion protection which must be removed before
operating the cylinder. This is best done by a light brushing with kero-
sene/paraffin, followed by the cylinder being thoroughly dried.
2. FIXING OF THE ROTATING HYDRAULIC CYLINDER TO THE
LATHE SPINDLE.
2.1 There are many different ways of mounting a rotating hydraulic cylin-
der to a lathe spindle. The fixing system chosen depends on how the
rear part of the spindle itself is built.
Fig. 1
Cylinder
Concentricity
Flatness
2.2 HANDLING OF THE CYLINDER
Important: the cylinder can be handled only by using the proper lifting
device. According to the location the cylinder will have on the machine
(horizontal or vertical) it will be necessary to use lifting chains, and or
belts, and or eyebolts. (see fig. 2).
n
Attention: the operator must check that:
- The belts or lifting chains are strong enough to lift the load and are in
perfect working conditions;
- The eyebolts are screwed to the bottom (see fig.3).
Z
2.3 In order to turn at high speed with minimum imbalance and
vibration, the cylinder must be as close as possible to the rear spindle
adaptors and turn perfectly centered in comparison to the machine's
rotational axis.
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SIN- CYLINDERS USE AND MAINTENANCE INSTRUCTION

Size ≤ 175 Size ≥ 200
0,01 0,015
0,005 0,010
It is therefore necessary before mounting the cylinder, to check that
the mating surface onto which the cylinder will bear, is running true to
the following precision criteria:
Fig. 2
Fig. 3
2.4 Once the precision of the adaptor has been checked, assemble the
cylinder on the adaptor itself, preferably using the rear fixing screws
(solution 1). First tighten the screws slightly, then center the cylinder
so that the rotation takes place according to the following precision
criteria:
Fig. 4
Then tighten the screws fully with the torque values in the following table:
Screw nominal
Size
M8
M10
M12
M16
M20
2.5 The connection of the rotating cylinder to the chuck or to any other
clamping device is made by means of a draw bar (for assemblieswith
closed center) or by a draw tube (for assemblies with partial open
center).
In assemblies with partial open center, we suggest the use of "AUTO-
BLOK" connecting units and to guide the tube into the spindle hole. In
closed center assemblies please note the following points:
A) The draw bar must have the fixing thread that screws into the F thread
of the cylinder 5-10mm less than the W-dimension (see page 3-5-7).
B) The draw bar must have a location diameter (concentric with the th-
read), matching the K1 diameter, for a lenght of 8mm, and a bearing
face square to the thread matching the front face of the piston rod (see
page 3-5-7).
C) The draw bar must be supported along its length by at least two
bushes, mounted on the bar to centralise in the machine spindle.
This is essential when using the piston in thrust conditions, to avoid
possible, bending of the draw bar, due to the "combined bending and
compressive stress".
Solution 1
Solution 2
Class 12.9
F (KN) M (Nm)
16 23
26 45
38 77
72 190
110 370