Bore clamp B1.48420 pages

Issue 2-14 E

B 1.4842
Bore Clamps
Flange type, without centring function, double acting,
for bore diameter 7.8  17.7 mm, max.operating pressure 250 bar
– 
Advantages
●●Axial clamping in simple bore holes
●●5-sided machining possible
●●Expand clamping bushing with spring force
●●Hold workpiece without hydraulic pressure
●●Clamp workpiece with adjustable hydraulics
●●Hardened workpiece support
●●Pneumatic seat check
●●Connection for positive air pressure protection
●●Standard FKM seals
●●2 sizes available

Function

2

1

1

2

1t Expand clamping bushing
with spring force
Hold workpiece
Safety in case of
pressure drop
2t Clamp workpiece with
hydraulics
Adjustable clamping force

Pneumatic seat
check

Position
workpiece

Application
The bore clamps are particularly suited for
clamping of workpieces with smooth bore holes
from diameter 7.8 to 17.7 mm in the support surface.
The required form-fit in the bore hole is obtained
by the special profile of the hardened clamping
bushings with penetrating points in the bore hole
wall. Hardened materials cannot be clamped
with these elements.
The workpiece is put directly onto the bore
clamp and will not be deformed during clamping.
Since clamping is effected within the bore, the
remaining surfaces are free for machining on 5
sides (see application example).

Description
Connecting possibilities
The bore clamp is a double-acting pull-type Drilled channels
cylinder. An exchangeable clamping bushing is
fixed to the piston.
The four segments of the clamping bushing are
radially expanded with spring force by a pyramid-shaped clamping bolt. Thus the expansion
force is always the same and independent of the
hydraulic clamping pressure.
The workpiece is also held without hydraulics by
means of the expanded clamping bushing.
Both pull-down of the workpiece and unclamping of the clamping bushing are hydraulically
controlled.
Connecting the positive air pressure protection,
the clamping bushing is protected against swarf
and coolants.
In the hardened support surface for the workpiece there is a bore hole for the pneumatic seat
check.

The size of the possible machining forces is certainly limited using this type of clamping, especially crosswise to the clamping surface.
Except the static friction force between the
workpiece and the support, the bore clamp cannot compensate any side loads. Additional stops Important notes
or positioning elements can help in such appli- The bore clamp has no centring function.
cations.
The clamping bushing has to be protected
Workpiece sections that are subject to vibrations against too high side loads during insertion or
and deformations during machining, have to be machining by suitable stops or centring bolts.
additionally supported or clamped in a flexible The required positioning precision is ± 0.2 mm.
(floating) position.
The required penetration depth of the toothing
depends on the strength of the material for the
Functional description
form-fit toothing with the workpiece. Therefore
hardened or coated workpieces cannot be used.
See page 4.
The tapering of the bore hole should not exceed 3°.

In case of doubt we recommend a clamping test.
Clean the support surface and blast clean the
clamping bushing before every clamping cycle.
If swarf fall into an open clamping bore, blast air
must be continuously switched on.
Clamping bushings and wiper should be
e
­ xchanged after 100,000 operations.
Part numbers for complete clamping sets:
see chart on page 3.
Operating conditions, tolerances and other data
see data sheet A 0.100.

Application example
Machining of a plate from 5
sides on an indexing bridge

Römheld GmbH · Postfach 1253 · 35317 Laubach, Germany · Tel.: +49 (0) 6405 / 89-0 · Fax: +49 (0) 6405 / 89-211

Actual issue see www.roemheld.com
Subject to modifications