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Turning tools for internal machining
Boring bars
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The various product ranges are fitted to each other in such a way as to offer a wide range of applications to the customer. Our tools are already
applicational starting at a diameter of 4 mm and are available with different approach angles. Depending on the individual application you can choose among boring bars with steel- or carbide shanks. Carbide shanks enable the usage of large L/D relations. |
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An additional design feature of our boring bars is the precision-ground insert (the second cutting edge is protected in the insert pocket), the positive chipbreaker geometry and excellent chip flow. These features are responsible for an advantageous chip forming, reduced machining force and as a result a superior process stability even under difficult machining
conditions.
Click here to find the exact measurements and the corresponding inserts. |
Mini-Boring bars
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Effective . . .
are the new mini-boring bars starting from 5 mm bore diameter
Their technical characteristics will convince you:
The efficient core part of our tools is a positive precision-ground
insert with two cutting edges. In the tool this insert is attached in
the special shaped insert pocket, which was manufactured with high
precision by electrical discharge machining.
The special form of the insert and the insert pocket result in a
selflocking device. Thus the arising cutting forces are intercepted as
far as possible.
Within the tool the main cutting edge of the insert has a central
position. This results in a maximum chip flute. At the same time this
avoids that the chips destroy the bore surface. As everybody knows this
is not possible in tools with back rakes and thus has negative
consequences (vibrations and problems with tool life).
Clamping is effected by a hidden clamping element.
 Free
chip flow is guaranteed. To change the insert the clamping element only
has to be loosened a bit, then the insert can radially be taken out of
the insert pocket of the tool. The clamping element continues to be
connected captive with the tool holder. The spare cutting edge of the
insert is completely protected in the insert pocket. A premature
destruction, e.g. due to chip flow, is impossible.
As a standard item these tools are available as right-hand and left-hand
versions, either with steel- or carbide shank. Three shank dimensions
for 5 mm- 7mm or 9 mm bore diameter can be chosen. The approach angles
are either 90° or 95°, depending on the intended purpose.
In order to hard-face these tools only a right-hand or a left-hand
insert type is necessary. By means of a special grinding these tools can
also be used for machining all kinds of form recesses. The maximum
plunging breadth for this is 1.2 mm. Special designs on request.
Possible materials are carbides, coated carbides, cermets, PCD and CBN.
Chip removal of steel-, cast- and light metal materials can be effected
in one tool by exchanging the insert with the corresponding cutting edge
geometry.
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Cartridges with tapered screw adjustment
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ISO-cartridges offer an utmost degree of flexibility in the design of customer specific tool solutions. The HOLLFELDER cartridges differ from the competition particularly in the way the radial adjustment is achieved whereas dimensions are also according to ISO-DIN. Contrary to other ISO-DIN-cartridges with adjustment by radial screw the machining diameter of HOLLFELDER cartridges is adjusted in a convenient and highly precise way by means of a tapered
screw.
