REMS Unimat 75 Instrucciones De Servicio página 12

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right end position by turning the start cutting lever (17) (Fig. 4), set the thread
length (see 4.2. and 4.3.).
Mechanical vice:
Insert the material carefully until it is touching the chase dies. The material is
clamped self-centring with the clamping lever (23) (Fig. 4).
Pneumatic vice:
Set the pneumatic vice to the diameter to be clamped as follows: Loosen the
clamping screw (27) (Fig. 12). Open the vice with the clamping lever (23) (Fig.
12). Move forward the pneumatically operated die (33) (Fig. 12) by pressing
the foot switch. Push the adjusting plate provided (31) (Fig. 12) between the
pneumatically operated die (33) (Fig. 12) and its die body (32) (Fig. 12). Open
the pneumatically operated die by pressing the foot switch again. Insert the
material to be clamped. Close the vice manually with the clamping lever (23)
(hand tight) until the dies are touching the material. Tighten the clamping screw
(27). Press the foot switch, remove the adjusting plate. Insert the material
carefully until it is touching the chase dies. Clamp the material tight by pressing
the foot switch.
The adjusting plate must be inserted if required when manual clamping is
necessary with the pneumatic vice otherwise the thread is not cut in centre.
To clamp plastic tubes or thin-walled metal pipes it may be necessary to reduce
the working pressure of the compressed air to avoid unround tension.
4.6. Work process
Close the protective cover (21) (Fig. 4). Switch on the machine (see 4.4. for
speed selection), start cutting thread by moving the start cutting lever (17) in
counterclockwise direction. The feed becomes automatic after 2 or 3 thread
turns have been cut. On reaching the set thread length, the closing lever (1)
hits the trigger cam (2) and the chase dies open automatically. Move the gear
unit clockwise by pressing the start cutting lever (17). Turn the start cutting
lever completely to the right past the spring loaded end position with the machine
running so that the die closes again. Now switch off the machine by pressing
the button (22) (Fig. 4) and remove the material.
With Unimat 75 long threads up to Ø 30 mm can be cut. Set the length stop to
max. length if necessary (see 4.3). The material is fed through the gearbox and
the motor (hollow shaft). Before the closing lever opens the die head, switch
off the machine, open the vice, move the die head with material to the right end
position with the start cutting lever (17) but not past the spring loaded end
position. Close the vice again, switch the machine back on. You can repeat this
process as often as you like.
4.7. Special clamping devices
Special dies Ø 6 – 42 mm are available for cutting threads on short bolts (Fig.
13).
REMS Nippelfix, the automatic inside clamping nipple holders in 9 sizes from
½ to 4" are used for cutting nipples. Make sure that the pipe ends are deburred
on the inside, the pipe sections are always pushed onto the nipple holder up
to the stop and that no shorter nipples are cut than the standard allows. Do the
setting work and work process the same as described in 4.1. to 4.6.
WARNING
Wear gloves to pull nipples off the nipple holder to avoid getting cuts
from the thread!
4.8. Difficult to cut materials
HSS chase dies must be used to cut threads on high strength materials (from
approx. 500 N/mm²) and on stainless steel (Inox).
4.9. Thread cutting on concrete ribbed steel
Chase dies with an additional cut (model „RHSSZ") must be used for this. The
concrete ribbed steel can be clamped with both manual and pneumatic vices.
The unround cross-section of the concrete ribbed steel must be inserted into
the manual vice so that the small diameter is horizontal. With the pneumatic
vice, make sure that the concrete ribbed steel is always clamped as the vice
was set, i.e. if the setting was made horizontally with a small diameter, the
concrete ribbed steel must always be inserted in the same position because
otherwise the clamping distance of the pneumatic vice is not sufficient to clamp
the material safely.
If material is difficult to cut, select speed 35 rpm (button I), use REMS Spezial
thread cutting material. The cutting starting process lasts longer than with
normal materials. Maintain the cutting start pressure until 2 to 3 thread turns
are cut and the further in-feed takes place automatically.
4.10. Chamfering/peeling dies
A chamfering/peeling die head 45°, Ø 7 – 62 mm, with chamfering/peeling dies
45°, Ø 7 – 62 mm, with holders is offered as an accessory for REMS Unimat
75. This can be used to chamfer pipes and bars at the ends with an angle of
45° at the outer diameter. Other angles can be ground onto the chamfering/
peeling dies by the user. The diameter at the end of a bar can also be reduced
with the chamfering/peeling dies, i.e. a point can be turned. If the chamfering/
peeling dies with holders are to be installed in a thread die head, the closing
lever (1) (Fig. 2) must be replaced by the collared bolt for chamfering/peeling
dies (Art. No. 751101). See 3.2. Mounting (changing) the closing lever.
The chip depth for peeling is a max. 7 mm. The lowest engagement depth is
approx. 0.35 mm in the diameter according to a number of the adjusting spindle
(10) (Fig. 2) of the die head. See 5.3 for setting the chamfering/peeling dies.
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Feeding must take place manually during the whole process for chamfering
and peeling.
5. Maintenance / inspection / service
WARNING
Pull out the mains plug before performing maintenance, inspection and
setting work!
5.1. Maintenance
REMS Unimat 75 and 77 are maintenance-free in normal operation. The gears
run with a life-long oil or grease filling and need no relubrication.
If the closing lever is difficult to move by hand, the complete die head must be
cleaned thoroughly. To do this, it is best to remove the die head from the machine
(see 3.1). Dismantle the cover, closing lever and die set and unscrew the label
plate (24) (Fig. 2) from the die head. Now dirt and chips can be blown through
from above, preferably with compressed air. The adjusting spindle (10) may
not be removed or adjusted! Clean the cover, square bar in the die head and
die set with a clean, lint-free cloth. Remove stuck residue of thread cutting
material and dust with petroleum or benzene. Reinstall the closing lever, plate,
die set and cover, tighten the fillister head screw (8) (Fig. 4) and check the
smooth action of the closing lever. Remove the die head again if necessary
and check the cover, square bar in the die head and die set for burr or other
damage and remove this properly with a fine file or oilstone.
In case of heavy stress, e.g. series production, the oil level in the gear must
be checked on the REMS Unimat 75. To do this, remove the screw cap with
oil dipstick (34) (Fig. 11), wipe off the dipstick, screw back in completely, remove
again and check the oil level on the dipstick. The oil level must be between the
two marks at the end of the dipstick. Refill gear oil (Art. No. 091040 R1,0) if
necessary.
The tank for the thread cutting material in the machine stand must be cleaned
at certain intervals. To do this, remove, empty and clean the chip collector (37)
(Fig. 4). Drain the thread cutting material at the drain nozzle (35) (Fig. 1) and
filter or dispose of properly. Clean the tank for the thread cutting material
thoroughly with cloths through the opening for the chip collector. Preferably fill
with new REMS thread cutting material.
5.2. Sharpening the chase dies
The value γ = 20° has proven most effective as a cutting angle (Fig. 7) for
general applications. A notch which corresponds to the value γ = 20° has been
cut in the enclosed setting gauge (Fig. 8). It may be advisable to increase the
cutting angle for harder materials. On the other hand, it may be necessary to
reduce the value of γ especially when the chase dies stick, e.g. with thin-walled
pipes, nonferrous metals and plastics. The following values generally apply
from experience:
Medium strength steels (300...400 N/mm²), high grade steel
High strength steels
Nonferrous metals
Plastics, e.g. PVC hard (special chase dies)
For thread diameters > 33 mm an angle of 45° must be made at the end of the
face on the chase dies (Fig. 7). This must be big enough so that the chase dies
do not protrude over the gliding surface (26) (Fig. 10).
The chase dies are angled in the holder according to the thread pitch. According
to this angle, the angle δ (Fig. 9) must be applied to the chase dies so that the
teeth tips of the chase dies are on a level parallel with the base surface of the
holder after installation in the holder. A tolerance of ± 0.05 mm must be kept
here. The angle of inclination must also be observed when installing replace-
ment chase dies because different chase dies can be installed in several holders
to produced fine threads.
Guide teeth must be ground onto certain chase dies to improve the pitch toler-
ance for longer threads. These must be reground when regrinding the chase
dies.
5.3. Setting the chase dies in the holder
Make sure that the numbering of the chase dies matches the numbering of the
holders and that the mounted clamping plate including the screw does not protrude
over the holder surfaces. Overhangs must be removed if necessary (e.g. grinding
off). Chase dies delivered already in holders are ground to size at the factory and
should fit without modification, clean the die head if necessary.
To set the chase dies and the chamfering/peeling dies in the holder to dimen-
sion 55.4 mm in REMS Unimat 75 (Fig. 10) or 95.4 mm in REMS Unimat 77,
the screw of the clamping plate (25) is screwed tight. The specified dimension
must now be set with a dial gauge or the setting gauge provided (Fig. 8) between
the bottom edge of the holder and the first tooth after the cutting start (Fig. 10).
To do this, the chase die is pressed forward with the adjusting screw on the
bottom of the holder. The adjusting screw must be under pressure to the chase
die. In REMS Unimat 75 the dimension 55.4 mm (Fig. 10) must be kept with a
tolerance of ± 0.05 mm. For smaller threads (Ø 6 ...12 mm) it can be set pref-
erably to 54.3 mm. However, it is important that the tolerance of ± 0.05 mm is
kept within the 4 chase dies of a die set. For REMS Unimat 77 the value 95.4
mm ± 0.05 mm must be kept accordingly.
5.4. Service
WARNING
Pull out the mains plug before carrying out maintenance or repair work!
eng
γ = 20°
γ = 20 ... 25°
γ = 10 ... 20°
γ = 0°