Title of Invention

CUTTING TOOL FOR WORK PIECES

Abstract A tool for the fine machining of workpieces is proposed, having at least one cutter tip and at least one setting device, acting on the cutter tip, this tool being distinguished by the fact that the setting device (25) comprises an adjusting element (27, 27'), extending over a region of a side face of the cutter tip (11), and a set screw (31) displacing the adjusting element relative to the cutter tip.
Full Text FORM 2
THE PATENTS ACT, 1970 (39 of 1970)
COMPLETE SPECIFICATION (See Section 10)
CUTTING TOOL FOR WORK PIECES
MAPAL FABRIK FUR PRAZISIONSWERKZEUSE Dr. Kress KG of OBERE BAHNSTRASSE 13, 73431 AALEN., GERMANY, GERMAN Company

The following specification particularly describes the nature of the invention and the manner in which it is to be performed 5 -


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Description
The invention relates to a tool for the fine machining of workpieces according to the preamble of claim 1. •
Tools of the type addressed here are known. They have at least one cutter tip, by meemn of which chips, are removed from the workpiece by a relative movement being realized between the tool or the cutting edge of the cutter tip and the workpiece The tool is usually set in rotation in order to machine -n stationary workplace. The at least one cutter tip can be displaced by means -.of a setting device, it lias
been. found that, in the process, an exact orientation of the cutter tip cannot be realized or can only be realized with Considerable effort.
The object- of the invention is therefore to provide a tool which does not have this disadvantage. to achieve this object, a tool is proposed which is
Point-like contact between setting device and dutber tip is thus avoided. At the sam time, ;on account, of the tact that
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the adjusting element extends over a (region of the side face
of the cutter tip, exact positioning of the cutter tip is
possible.
An exemplary embodiment of the tool which is distinguished by the fact thai: the adjusting element has an adjusting surface which comprises two bearing surfaces arranged at a distance from one another is preferred. In other words: the adjusting surface has an interruption in order to realize two contact regions arranged at a distance
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from one another, between the cutter tip and the adjusting element,
An exemplary embodiment of the tool which is
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distinguished by the fact that the setting device has two adjusting elements which act on different side faces of the cutter tip and thus permits different setting directions is
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especially preferred.
Further configurations follow from the remaining subclaims
The invention is explained in; more detail below with
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reference to the drawing in which: i
Figure 1 shows a diagrammatic ketch of a tool in front view Figure 2 shows a detail of the tool in aide view, Figure 3 shows a first modified form compared with the tool shown in figure 2;

Figure 4 shows a further modified form of the tool shown in
figure 2; "
Figure 5 shows views of an adjusting element; Figure 6 shows a plan view of a modified exemplary embodiment
of the adjusting element, and Figure 7 shows a side view of the adiustinq element shown in
figure S. The diagrammatic sketch according to figure 1 shows a tool 1 in front view, that is the front end 3 of the tool.
Here, the basic body 4 of the tool l, by way of example, is designed to be essentially cylindrical, It is provided with a recess which extends in the longitudinal direction of the tool 1 andserves as chip space 5. recess 9 into which a cutter tip1 11 is inserted is made in a boundary surface 7 of the chip space 5. An edge of the cutter tip 11 which projects beyond the peripheral surface 13 serves as cutting edge 15 and to remove chips from a workpiece. For example, the tool 1 serves for the fine machining of a bore surface 17, indicated by a circle, in a workpiece.
in the exemplary embodiment shown here, the cutter tip 11 is fastened to the basic body of the tool 1 by means of a clamping screw 19 which passes through the cutter tip 11 and holds the latter securely by means of a screw head, It is also possible to fasten the cutter tip 11 to the basic body of the tool 1 by means of a conventional clamping shoe.
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Figure 1 shows the cutter tip 11 in side view. It can be seen that the top and bottom side faces 21 and 23, respectively,
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run conically toward one another and enclose an acute angle With one another, which opens from right to left. As a result, a "positive" clearance angle is realised: the side face 21 falls away from left to right starting from the cutting edge 15, whereas the bottom side face .23 rises from left to right.
A setting device 25, which comprises an adjusting element 27, interacts with the bottom side face 23. The adjusting element 27 is provided, with an adjusting surface 29, which bears flat against: the bottom side face 23 of the cutter tip 11 and falls away from right to left. The adjusting element 27 can be displaced relative to the cutter tip 11 by means of a set screw 31. The bottom side face 23 and the adjusting surface 29 virtually form a wedge mechanism. During a displacement of the adjusting element 27 to the left, the cutter tip 11 is displaced outward in the radial direction relative to the rotational or center axis 33 of the tool 1.
The adjusting element 27 has a preferably cylindrical extension 35, which is accommodated in a corresponding recess in the basic body 4 of the tool .1 and serves to guide the adjusting element 2 7 in the tool 1.

In the representation according to figure l, the basic
"body 4 of the tool 1 is partly cut away so that the clamping
screw 19, the extension 35 and the set screw 31 can be seen.
The set screw 31 is accommodated in a hole which is made in
the basic body 4 and opens to the right, that is to say it intersects the peripheral surface 13..; As a result, the set screw 31 is fiehley accaafliblo from the right. However, it is also possible to design the chip space 5 to be so large that the set screw 3,1 is also accessible from the left via the chip space 5.
Figure 2, in plan view, shows the front part of the tool 1 with" the cutter tip 11, the top longitudinal edge of which forms the cutting edge 15, the right-hand top corner 37 likewise belonging to the cutting edge of the cutter tip 11. Here, by way of example, the cutter tip is designed to be
essentially square. However, it may also be designed, for
example, as a parallelogram or as a rhombus. The head of the
clamping screw 19 which passes through the cutter tip 11 and
is anchored in trie basic body of the tool l, can clearly be
seen, By means " of this clamping screw 19, the full face of
the cutter tip 11 is pressed against the base of the recess
9. The setting device 25 can clearly be seen here, in

Particular the adjusting element 27, which extends over a region of the bottom side face 23 of the cutter tip 11. The adjusting element preferably extends" over a substantial part
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of the: side face of the cutter tip 11 in particular Virtually over Its entire width. The extension 35, which projects at the bottom beyond the adjusting element, can also be seen in the plan view. Here, just" like the clamping screw 19, the set screw 31 extends perpendicularly to the plane of figure 2.
It can be seen from the representation accoxding to figure 2 that the setting device 25 comprises an adjusting element 27 which, during an appropriate displacement, displaces the cutter tip 11 at an angle of 90° to the center axis 33. The machining radius of the tool 1, that is the size of the projection of the cutting edge 15 relative to the peripherals surface 13, can thus bo set.
It can be seen from figure 2 that the cutter tip 11 also projects relative to the front end 3.
Figure 3 shows a first modified form of the tool l. The same elements are provided with the same reference numerals, so that in this respect reference is made to the description of figures 1 and 2.
The exemplary embodiment shown in figure 3 differs from that shown in figure 2 solely by virtus of the fact that the setting device 2 5 is not arranged between the putter tip .3.1 and the center axis 33 of the tool 1 " but at the inner side face 39 of the cutter tip 11 the side face 39 here running essentially perpendicularly to the center axis 33 and


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parallel to the outer side face 41 which projects beyond the
front end 3 of the tool 1.

In an arrangement of the setting device 25 and of the associated adjusting element 27 according to figure 3, an axial displacement of the cutter tip 11 is achieved by means of the set screw 31, so that ir.s outer side face 41 projects more or lean beyond the front end 3 of the tool 1.
The modified exemplary embodiment of the tool 1 shown in
figure 4 is distinguished by the fact that the setting device
25 has two adjusting elements 27 and 27" , the first adjusting
element, as explained with reference to figure 2, running
between cuttar tip 11 and center axis 33 of the tool, and the
second adjusting element 27 as explained with reference to
figure 3, running at a distance from the front end 3
"perpendicularly to the center axis 33. It is therefore
possible to set the projection of the cutter tip beyond both
the peripheral surface 13 and the front end 3, that is the
radius and the length of the tool.
Figure 5 shows one of the adjusting elements, for example the adjusting element 27 of the setting device 25, in various view and also the set screw 31. At the top in figure 5, the set screw 31 is shown in aide view on. the extreme left. The set screw 31 hers is a differential screw" which has two separate regions with different external threads; for example, the left-hand region 43 is designed aa
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a right-handed thread and the right-hand region 43 is deigned as a left-handed thread The threaded regions may of course also be transposed it is essential here that the threaded regions have opposite orientation.
To the right of the set screw 31, the adjusting element 37 is shown in side view, as is the case in figure 1. The adjusting element 27 is again shown to the right of this in front view, as is the case in figures 2 and 4. On. the extreme right at the top, the adjusting element 27 is again shown in
side view, although here the left side of the adjusting element 27 is reproduced. At the bottom in figure 5, the adjusting element 27 is reproduced in plan view, 30 that the adjusting surface 29 can also be seen in plan view. The cylindrical extension 35, which serves to guide. the adjusting element 27 in the basic body of the , tool 1-, becomes clear from the representation according to figure 5. The hole 47 serving to receive the set screw 31 can clearly be seen in the various representations of the adjusting element 27. It passes through the extension 35,
In the top half of figure 5, it can be seen that the adjusting surface 29 is inclined relative to the center plane 47, indicated by a line, of the adjusting element 27. The angle of inclination of the adjusting surface 29 is matched to the angle of inclination of that side face of the cutter tip 11 against which the adjusting element 27 bears.
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In an especially preferred manner, the adjusting surface 29 13 designed in such a way that it has two bearing surfaces 29a and "29b lying at a distance from one another. The region 29o lying in between is sunk relative to the adjacent regions, so that the adjusting element 27 does not touch the associated aide face of the cutter tip 11 here. This configuration ensures that, the adjusting element 27 bears flat against the associated side faces of the cutter tip 11, so that- support of the cutter tip 11 over a relatively large area by means of the setting element 2 5 is ensured. In particular, more or less point-like contact of a set screw, ay ussed in a conventional manner, is avoided.
Figure: i5 shows a modified exemplary embodiment of. an
adjusting element 27 in plan view, Parts which correspond to
, the parts? described above are provided with the same
reference numerals, so that in this respect -reference is made
to tha description with regard to figures 1 to 5.
The. adjusting element 27 has an adjusting surface 29 which, as explained with refensnce . to figure 5, has two bearing surfaces 29a and 29b arranged at a distance from one another. Provided between the bearing surfaces 29a and 29b is a sunk reqion 29c, which does not touch the associated side face ,of a cutter tip 11 when the adjusting element is being used.-
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. A hole 47, into which a clamping screw (not shown here) can be inserted, passes through the adjusting element 27.
The exemplary embodiment of the adjusting element 27 shown here is distinguished by the fact that wall regions laterally adjoining the adjusting surface 29 are designed in a V-shape, the V opening from top to bottom in the direction of the adjusting surface 29. This results in two opposite contact surfaces 51 and 51 the length of which is defined by the bottom region 53 opposite the adjusting surface 29 being rounded off. The contact surfaces used are the rectilinear sections between the region 53 and the adjusting surface 29 of the side wall of the adjusting element 27.
The region 53 connecting the two contact surfaces 51, 51" Is of curved design. Its outer contour preferably follows ah arc of a circle. The radius of the arc of a circle is preferably selected to be larger than that of the recess in the basic body 4 of the tool 1, into which recess the adjusting element 27 is inserted. This ensures that the adjusting -element 27 touches the basic body 4 of the tool l merely in the region of the contact surfaces 51, 51".
An exaet angular orientation of the adjusting element"27 and thus of the adjusting surface 79 is obtained by means of the v.-shaped contact surfaces 51, 51", which interact with corresponding bearing surfaces in the basic body" 4 of the tool 1- This exact orientation enables the cutter tip 11
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interacting "with the adjusting element 27 to be oriented exactly and thus enables, for example, the desired slope of a secondary cutting edge, which slopes down from the front edge of a cutter tip 11 (SEE figure 2 for example) to the left, to be ensured.
The yj.de view of the adjusting element 27 shown in figure 7 shows that it is designed essentially like the adjusting element explained with reference to figures 1 to 5. Figure 7 shows the width B of the. contact surfaces 51, 51" . A first, line 55 indicates how far the contact surfaces 51, 51" extend downward. A second line 57 indicates that the contact surfaces 51, 5l do not have to extend fully up to the adjusting surface 29.
It is essential that the adjusting element 27 explained with reference to figures 6 and 7 is distinguished by the fact that both the adjusting element 27 and the adjusting surface 29 are exactly oriented by V-shaped or: prismatic orientation of the contact surfaces 51 51
Adjusting elements as have been explained with reference to figures 6 and 7 may be used individually, as described with reference to figures 2 and 3. However, it is also possible to use two such adjusting elements, as has been
explained, with reference to figure 4
It is especially advantageous that the setting device 25 is of very simple construction" and the inclination of the
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side faces of the cutter tip 11 which is provided for by the positive clearance angle, is utilized for forming wedge mechanism, it is thus possible in a simple manner to displace the cutter tip 11 in the direction of the center axis 33 and/or at an angle thereto by displacing the adjusting element 27 and./or the second adjusting element 27
In practice, the size of the adjustment... is relatively small and. essentially serves to compensate for tolerances in the manufacture of the cutter tip 11 and/or of the recess 9 receiving the cutter tip. In addition, any clearance possibly .still present between clamping screw 19 and cutter tip 11 can be compensated fox- by means of the setting devices described hers. In particular, a settling movement of the cutter tip, that is a displacement of the cutter tip 11 during the initial use of the tool 1, can be reliably avoided in a simple manner.
From the explanations with regard to figures 1 to 7, it-can readily be seer that the setting device described here may also in particular, be used in tools which have a "plurality of cutter tips By means of the setting device 25, dimensional differences between the various cutter tips can then also be compensated For, that is to say not only dimensional differences which exist in the respective cutting edge 15 of a cutter tip 11.
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Finally, the setting device 25 described here may also *e uaod together with tools whose outer contour is not cylindrical, at least not continuously cylindrical. In all cases, it is ensured that the setting of the cutter tip and its positioning can be optimally predetermined, so that dimensional specifications can he exactly adhered to during the fine machining.
From the above, it becomea clear that, when the set screw 31 is turned in the one direction of rotation, the adjusting element 21 is displaced and, on account of the wedge-shaped contact between the adjusting element: 27 and the cutter tip 11, the cutter tip 11 is displaced radially outward, in the course of which the clamping ©crew 19 holding the cutter tip 11 is elascically deformed. If, in the course of setting work, the Bet screw 31 is turned in the other direction of rotation, "the adjusting element 27 is accordingly displaced in the other direction/ as a result of which, on account of the wedge-shaped contact with the cutter tip 11, the latter is moved back into the position directed radially inward. This movement is effected on.account of the elastic deformation of the clamping screw 19 by virtue of the fact, that the existing prestreas is reduced ayain ss a function of the yiae of the displacement o£ the adjusting element 27, it is therefore not necessary to knock "the cutter tip 11 inward with a tool, but rather this return
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WE CLAIMS :
1. A cutting tool for workpieces comprises a parent body, having at least one cutting edge projecting beyond a circumferential surface of the parent body, and having a setting device that sets the radial distance of the at least one cutting edge from a center axis of the parent body, wherein the setting device has a setting element, and an adjusting device able to actuated to vary the bending of the setting element, and wherein the said setting element is disposed in the parent body of the tool in such a way that, when the bending of the setting element is varied from an initial position, the radial distance of said at least one cutting edge is varied from an initial position.
2. The tool as claimed in claim 1, wherein the setting element is planar in said initial position.
3. The tool as claimed in claim 1, wherein the setting element is curved in said initial position.
4. The tool as claimed in claim 1, wherein the parent body of the tool has an abutment which supports the setting element so as to prevent displacement of the setting element in the direction along the center axis when the adjusting device is actuated.
5. The tool as claimed in claim 4, wherein the abutment comprises a welded connection between the setting element and the parent body.
6. The tool as claimed in claim 1, wherein the setting element is made of spring steel.
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The tool as claimed in claim 1, wherein the tool has a plurality of said cutting edges, and the bending of the setting element sets the radial distance of more than one of the plurality of cutting edges of the tool .
The tool as claimed in claim 7, wherein the bending of the setting element sets the radial distance of all of the plurality of cutting edges of the tool.
The tool as claimed in claim 1, wherein the radial distance of the at least one cutting edge can be either increased or reduced from said initial position by the setting element.
The tool as claimed in claim 1, wherein said setting element is capable of both increasing and reducing the radial distance of the cutting edge.
The tool as claimed in claim 1, wherein the adjusting device comprises an adjusting screw.
The tool as claimed in claimll, wherein the adjusting device comprises both an adjusting screw and a clamping screw.
The tool as claimed in claim 3, wherein said setting element is initially curved convexly away from said parent body of said tool.
The tool as claimed in claim 3, wherein said setting element is initially curved concavely toward said parent body of said tool .
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Documents:


Patent Number 213157
Indian Patent Application Number 348/MUM/2003
PG Journal Number 13/2008
Publication Date 28-Mar-2008
Grant Date 20-Dec-2007
Date of Filing 08-Apr-2003
Name of Patentee MAPAL FABRIK FUR PRAZISIONSWERKZEUGE DR. KRESS KG
Applicant Address OBERE BAHnSTRASSE 13, 73431 AALEN, GERMANY
Inventors:
# Inventor's Name Inventor's Address
1 DR. DIETER KRESS WALKSTRASSE 87, 73431 AALEN,
2 FRIEDRICH HABERLE FLIEDERSTRASSE 14, 73466 LAUCHHEIM,
PCT International Classification Number B26D 1/14
PCT International Application Number N/A
PCT International Filing date
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 102 23 687.9 2002-05-23 Germany
2 102 37 680.3 2002-08-16 Germany