Tool for fine machining boring surfaces

Details Tool for fine machining boring surfaces Tool for fine machining boring surfaces

1999-06-09

2001-05-01

Wellington, A. L. (Department: 3722)

Cutting by use of rotating axially moving tool

Tool-support with means to permit positioning of the tool...

Pivotable tool

C407S047000, C407S113000, C408S231000, C408S713000

Reexamination Certificate

active

06224301

ABSTRACT:

DESCRIPTION
The invention relates to a cutter insert for a tool for the finish machining, by chip removal, of bore surfaces in workpieces as described in the preamble to claim
1
and relates to a tool as described in the preamble to claim
9
. The invention also relates to a cutter insert for a tool for the chip-removal machining of bore surfaces as described in the preamble to claim
10
and as described in the preamble to claim
16
and a tool as described in the preamble to claim
17
.
Cutter inserts and tools of the type discussed here are known. The cutter insert(s) are held in the basic body of the tool with the aid of at least one clamping shoe, a clamping lip of the clamping shoe interacting with a clamping surface which is preferably arranged on the so-called cutter face, i.e. on the front surface of the cutter insert. It has been found that, particularly in the case of high machining speeds of 6000 rpm and more, secure retention of the cutter insert can no longer be ensured. This leads to people and machines in the vicinity being endangered because a cutter insert which is released can lead to injury and/or damage.
It is therefore the object of the invention to create a cutter insert which can be securely fastened in an associated tool.
To achieve this object, a cutter insert is proposed which has the features quoted in claim
1
. The cutter insert is distinguished by the fact that it has a substantially rectangular configuration and that the clamping surface encloses an acute angle with the hypothetical center line of the cutter insert. Because of this configuration, an oblique clamping surface occurs which leads to secure retention of the cutter insert in the tool.
An embodiment of the cutter insert is preferred which is characterized in that the cutter insert is configured as a reversible insert and has two clamping surfaces of preferably identical configuration. Such a cutter insert is characterized in that it can be rotated, in the case of wear of one cutting edge, by 180° about an axis which is at right angles to the center line so that a further cutting edge is available for the finish machining of bore surfaces.
Further embodiments follow from the other sub-claims.
In order to achieve the object, a tool with the features of claim
9
is, in addition, proposed. It is distinguished by a high level of functional safety.
In order to achieve this object, a cutter insert with the features of claim
10
is also proposed. The cutter insert is characterized in that the clamping surface of the cutter insert is directed in such a way that, when it is firmly clamped by means of the clamping shoe, the cutter insert permits the generation of clamping forces of which one component acts against the centrifugal force and guarantees secure retention of the cutter insert in the basic body of the tool.
An embodiment example of the cutter insert is preferred which is characterized in that the clamping surface is arranged so as to be inclined in two directions relative to a hypothetical central plane of the cutter insert. On the one hand, this special arrangement of the clamping surface ensures build-up of the usual clamping forces, which anchor the cutter insert in the basic body of the tool and press it against an abutment which absorbs the cutting forces occurring during the machining of bore surfaces. On the other hand, the inclination of the clamping surface in the second direction ensures that—as stated—clamping forces are built up which force the cutter insert in the direction of the axis of rotation of the tool and therefore act against the centrifugal forces. In this way, it is possible to ensure—without particular design complexity—that the cutter insert is secured against displacement even at high rotational speeds.
Particularly preferred is an embodiment example of the cutter insert which is characterized in that the cutter insert is configured as a reversible insert in which the clamping surface has two clamping surface regions which are arranged so as to be inclined in two directions relative to the hypothetical central plane of the cutter insert. The two clamping surface regions intersect in an intersection line which encloses an angle with a hypothetical center line of the cutter insert. Even in the case of a rotation by 180° about an axis at right angles to a front surface of the cutter insert, this ensures that a cutter insert of this type is both pressed against an abutment and subjected to clamping forces which are directed in the direction toward the axis of rotation of the tool and secure the cutter insert against displacement at high centrifugal forces.
Further embodiments follow from the other sub-claims.
In order to achieve this object, a cutter insert with the features of claim
16
is also proposed which is characterized in that the clamping surface is arranged in the region of a narrow side of the cutter insert. This clamping surface interacts with an abutment which is inclined in such a way that, when the cutter insert is firmly clamped, clamping forces are built up which oppose the centrifugal force and securely retain the cutter insert even at high rotational speeds.
In order to achieve the object, a tool is also proposed which has the features quoted in claim
17
.


REFERENCES:
patent: 3987524 (1976-10-01), Hollfelder et al.
patent: 4264245 (1981-04-01), Lindsay
patent: 5211516 (1993-05-01), Kress et al.
patent: 5221162 (1993-06-01), Okawa
patent: 5904452 (1999-05-01), Kress
patent: 5967706 (1999-10-01), Hughes, Jr.
patent: 4034345 (1991-08-01), None
patent: 21462716 (1985-04-01), None
patent: 88/08767 (1988-11-01), None

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