WO2016135283A1

WO2016135283A1 - Machining tool and method for removing burrs by cutting

Info

Publication number: WO2016135283A1
Application number: PCT/EP2016/054073
Authority: WO
Inventors: Hans-Michael Beier
Original assignee: Hans-Michael Beier
Priority date: 2015-02-27
Filing date: 2016-02-26
Publication date: 2016-09-01
Also published as: EP3261793A1; JP6499772B2; JP2018505787A

Abstract

The invention relates to a machining tool, which is designed in particular for deburring edges in cavities, such as for example for removing a burr on edges of intersecting bores, and to a method for removing burrs by cutting on an edge extending three-dimensionally on a first end of an inner face of a hollow cylinder, in particular burrs on an edge formed by interpenetrating bores. The machining tool (Z) is suitable in particular for deburring edges (300) in cavities and comprises at least one cutting element (1) having a projecting first cutting blade (10), the cutting edge (14) of which extends between two substantially parallel planes (E1, E2), wherein the first cutting blade (10) has at least a first cutting segment (20) and a second cutting segment (30), which are arranged on the respective end regions (11, 12) of the cutting edge (14). The first cutting segment (20) has a first wedge angle (21) and the second cutting segment (30) has a second wedge angle (31), wherein a minimum of the first wedge angle (21) and of the second wedge angle (31) is in each case less than 88°, and the free surfaces (23, 33) which are formed by the respective wedge angles (21, 31) each face a respective one of the two parallel planes (E1, E2).

Description

Cutting tool and method for removing burrs

The present invention relates to a cutting tool which is particularly designed for deburring edges in cavities, such as for removing a ridge at edges of intersecting holes.

Furthermore, the present invention relates to a method for the removal of burr on a spatially extending at a first end of an inner side of a hollow cylinder edge, in particular of burr on an edge formed by intersecting holes, which is in particular run with the cutting tool according to the invention.

It is necessary to remove burrs created there after the introduction of cavities in bodies, such as after drilling solid materials. This process is particularly complicated in interdigitating or penetrating bores or

Cavities. Due to the fact that resulting edges and existing burr are relatively far away and difficult to access for processing tools, is a

Burr removal here relatively time and / or tool intensive. In addition, after the deburring process has taken place, a relatively complicated check is required to determine whether the burr has been completely removed. In particular, in the leadership of flowing media, a still existing burr may have an unfavorable effect on the flow conditions generated or possibly lead to disruption of burrs connected aggregates in demolition of ridge components.

Therefore, there is a need to completely and reliably remove generated burrs.

Difficult is such a burr removal, especially at acute intersecting holes. The pending penetration edge is in the form of an oval

trained, which extends spatially.

This means that this oval defines a curve in space that is symmetrical or asymmetrical depending on the crossing angle of the holes. The angle of the edge forming this oval is not constant over the course of the curve. Depending on

Crossing angle of the holes also varies the edge angle usually in a range between 15 ° to 165 °. Furthermore, tolerances affect the Distances, angles and diameters of the intersecting holes also depend on the size of the edge angle at a particular point in the spatial curve of the edge.

There are various methods and devices for removing burr in drilling known. It has been found that in particular milling process due to the formation of secondary ridge are not optimal to eliminate burr in cavities, especially in intersecting holes. The secondary burr must be removed with an additional operation, which has a negative effect on the time and thus on the

Cost impact.

From DE 102007020207 B9 is a tool for removing burr on the

Abutting edges of oblique transverse bores known which a

Tool shank having a clamping end and arranged on the tool-side shank end supporting body. The support body is adapted to a

To support a cutting body having a cutting edge with a shoulder. Of the

As a result, the cutting body can be applied to a edge to be deburred with a defined contact pressure. Upon rotation of the tool about its longitudinal axis, the cutting edge of the cutting body can descend the edge to be deburred and thereby eliminate existing burr there. In areas of the edge in which this has the smallest edge angle is bent around with the tool of the burr, so that with a subsequent

Processing step this bent burr can be separated.

DE 102012005246 A1 teaches a deburring tool for deburring in particular non-circular recesses in workpieces. This deburring tool is designed to function as a pushing and / or pulling tool which is driven stepwise about its longitudinal axis and / or driven in a displaceable manner and in the direction of its longitudinal axis. In a corresponding manner, a cutting edge of the tool is designed to reshape the burr by applying a compressive force and then to be able to separate. This means that two work steps have to be carried out in combination with each other, namely the forming and the separation. This causes a discontinuous operation and the formation of secondary ridge, which either reduces the quality of the product to be produced or

with further steps to remove.

From DE 10215004 B4 a deburring tool is known, which in a similar manner as the tool of DE 102007020207 B9 has a tool shank with a clamping end and a support body which supports a cutting body. The application of a fluid pressure causes the extension and application of the cutting body to the edge to be deburred. The cutting edge of the cutting body is designed such that it can be used in clockwise and counterclockwise rotation. The present invention is based on the object to provide a cutting tool and a method for cutting removal of burr for pleasure, with which in a simple, reliable and cost-effective the removal of burr in cavities, in particular at the edge of intersecting or crossing holes, is possible.

This object is achieved by the cutting tool according to claim 1 and by the method for the removal of burr on a spatially extending at a first end of an inner side of a hollow cylinder edge according to claim 9. Advantageous embodiments of the cutting tool are specified in the subclaims 2 to 8. Advantageous embodiments of the method for removing burrs are specified in subclaims 10 to 14.

The invention is supplemented by a computer program for carrying out the method according to claim 15.

To achieve the object, a cutting tool is provided according to the invention, which is particularly suitable for deburring edges in cavities. This cutting tool comprises at least one cutting element with a

protruding first cutting edge whose cutting edge extends between two substantially parallel planes, wherein the first cutting edge at least a first

Cutting segment and a second cutting segment, which are arranged at the respective end portions of the cutting edge. The first cutting segment has a first wedge angle, and the second cutting segment has a second wedge angle.

A minimum of the first wedge angle and the second wedge angle are each less than 88 °. The free surfaces, which are formed by the respective wedge angle, each facing one of the two parallel planes. That is, formed by the first wedge angle, a first free surface, which faces a first plane, and is formed by the second wedge angle, a second free surface, which faces a second plane which is parallel to the first plane. Thus, the first free surface facing a different plane than the plane which faces the second free surface. When defining a third plane which extends substantially between the first plane and the second plane and also parallel to the two planes, the bisector of the first wedge angle extends in an angular range of 120 ° to 160 ° to the third plane, and

Bisector of the second wedge angle extends in an angular range of 300 ° to 340 ° to the third plane.

There are thus provided on a cutting element two aligned in opposite directions wedge angle, which are formed on respective segment of the cutting element. As a result, the tool can be operated in opposite directions of rotation, so that in particular the edge can be machined at the same acute angle intersecting bores or existing burr with the same tool, depending on the respective direction of rotation, the corresponding cutting segment with the burr is bring into engagement , which forms an open space between cutting segment and burr. For the purpose of changing the use of the Schneidsegemte is only the direction of rotation to reverse and position the cutting tool according translational, so that it can bring the respective cutting segment in engagement. Consequently, it is not necessary to move the tool from another side into the object to be machined and / or further work steps in addition to the cutting process

perform.

In an advantageous embodiment of the cutting tool according to the invention, the cutting edge between the first cutting segment and the second

Cutting segment on a third cutting segment, the wedge angle is greater than the largest wedge angle of the first cutting segment and the second cutting segment.

Preferably, the wedge angle of the third cutting segment is 90 °. The length of the third cutting segment can be relatively small compared to the length of the serious one

Cutting segment and the second cutting segment, so that substantially the first cutting segment and the second cutting segment extend into or on a central portion of the first cutting edge.

The length of the third cutting segment may be shorter than the shortest length of the first cutting segment and the second cutting segment. This means that the length of the third Schneidsegmets is shorter than the shorter of the two designated as the first and second cutting segments cutting segments. The length of the third cutting segment may be so short that the other two

Cutting segments of the cutting element substantially in one point of

Cross cutting edge into each other.

In an advantageous embodiment of the cutting tool according to the invention it is provided that the first cutting identifies an arcuate course, so that the first cutting segment and the second cutting segment are designed arcuate. That is, the first cutting edge has a first wedge angle at a first end portion of its arc and a second wedge angle at a second end portion of its arc, wherein the first wedge angle and the second wedge angle are each less than 85 °. The two surfaces, which are formed by the respective wedge angle, each face a different one of the two parallel planes. The curvature of the

Cutting edge or its cutting edge causes it to extend in an arc in a spatial coordinate that runs between the two parallel planes. By the formation of the first wedge angle realized first free surface is facing the first plane, and realized by the formation of the second wedge angle second

Open space faces the second level. The two wedge angles are disposed between the two parallel planes on opposite sides of the cutting edge, the two wedge angles being in relation to the two parallel planes in each case

extending in opposite directions. The two end regions are separated from one another by a region arranged substantially in the central region of the arc, which region can be formed by the third cutting segment and which can have a wedge angle of 88 ° to 90 °.

When executing an arcuate edge, this may advantageously correspond in shape to a segment of a logarithmic spiral. In this case, this segment preferably extends in a range of 170 ° to 180 ° between the two parallel planes. The mean radius of the cutting edge can be in particular 0.5 mm to 1 mm.

However, the shape of the first cutting edge is not on the said arc

limited, but the two cutting segments, and in the case of an existing third cutting segment also the third cutting segment, can also be linear

Form cutting edges.

Preferably, the respective wedge angle increases in the course of a respective

Cutting segment from the end of the cutting segment towards the central portion of the first cutting edge. The end of the cutting segment is in this case also the respective end of the cutting edge of the first cutting edge. This means that with increasing distance from the cutting edge end of the respective wedge angle increases, which opens in the direction of one of the two parallel planes. This means that the

Wedge angle over the length of each cutting segment is not made constant.

The wedge angle can be dependent on the distance to the respective

Increase cutting edge end linearly or exponentially.

Preferably, a minimum of the wedge angle of the first cutting segment and the second cutting segment is between 84 ° and 87 °.

To give the first blade sufficient strength, this has

preferably in a central region a reinforcing element. This central area is in the presence of the third cutting segment in this third area

Cutting segment formed. Insofar as no third cutting segment should be present, this reinforcing element, also referred to as a shoulder, is preferably arranged substantially centrally between the first and the second cutting segment, so that the reinforcing element optionally separates the first and the second cutting element from one another. This so-called shoulder runs in her Longitudinal direction substantially perpendicular to the tangent, which lies at the intersection of the longitudinal axis of the reinforcing element with the cutting edge. The width of the reinforcing element or the shoulder should preferably be between 0.4 mm and 1 mm. In this embodiment, the reinforcing element or the shoulder should not reach to the edge, but end at least 0, 1 mm in front of the cutting edge.

In a further advantageous embodiment of the cutting tool according to the invention, the cutting element has a second cutting edge, which adjoins a first end of the first cutting edge and extends at an angle of 90 ° to 130 ° with respect to the region of the first cutting edge on which the second cutting edge connected. That is, with linear cutting segments, there is an angle of about 1 10 ° to 130 ° between the second cutting edge and the cutting edge segment of the first cutting edge to which the second cutting edge is connected. In the case of an arc-shaped first cutting edge, there is therefore an angle of approximately 90 ° to 130 ° between the second cutting edge and a tangent on the first cutting edge

Cutting segment of the first cutting edge, to which the second cutting edge is connected, wherein the tangent at a maximum distance of 1/10 of the length of the respective cutting segment from the end of the cutting edge is applied to this. Also the second

Cutting edge can be at least segmentally arcuate designed.

Furthermore, the cutting element of the cutting tool according to the invention may have a third cutting edge, which adjoins a second end of the first cutting edge, wherein the third cutting edge with the region of the first cutting edge, to which the third cutting edge is connected, an angle of 90 degrees to 130 degrees includes. This means that here as well as the second cutting edge and arcuately extending first cutting edge, an angle of 90 ° to 130 ° between the third cutting edge and a tangent to the

Cutting segment of the first cutting edge to which the third cutting edge is connected, is realized, wherein the tangent at a maximum distance of 1/10 of the length of the respective cutting segment at the end of the cutting edge is applied to this.

In the case of linear cutting segments, an angle of approximately 110 ° to 130 ° is preferably realized between the third cutting edge and the region of the first cutting edge to which the third cutting edge is connected.

The arrangement of the second cutting edge and the third cutting edge is also technically meaningful if the first cutting edge does not have the cutting edge segments with the wedge angle which is smaller than 88 °.

Also, the third cutting edge can be configured arcuate at least in segments, wherein it can also have a combination of arcuate and linear sections.

Preferably, the length and the width of the respective rake face of the second cutting edge and / or the third cutting edge are each greater than 0.02 mm. The cutting tool may be in one through the second cutting edge or the third

Cutting edge cross section have a height of more than 0.2 mm, said length, the width and the height in the directions of the coordinate directions of a Cartesian coordinate system and therefore perpendicular to each other.

Furthermore, the cutting tool according to the invention should advantageously have a tool shank with a longitudinal extent, wherein the cutting element is mounted substantially vertically displaceable with respect to an axis leading in the direction of the longitudinal extent. The longitudinal axis of the cutting tool or an axis parallel thereto forms the axis of rotation of the tool, so that the

Cutting element is mounted radially movable.

In this embodiment, the cutting tool is advantageously formed when it has a support body with which the cutting element is mechanically supported or supported.

That is, a preferably made of an elastomeric material support body supports a support surface of a movable in a breakthrough of the tool shank cutting element and thus radially applied to the cutting element with a force when the cutting element is engaged with material to be machined.

In an alternative embodiment, it is provided that the cutting tool has a fluid supply device with which the cutting element can be exposed to a static and / or dynamic fluid pressure, so that when the pressure is applied to the cutting element, it can be moved. A pressed under pressure into a through hole of the tool shank liquid or gaseous and / or consisting of a gas-liquid mixture substance can thus move the cutting element to the outside. With reduction of the fluid pressure and due to a restoring force in the

Machining area can thus again to a radial retraction of the

Scheidelementes come.

The concrete structural design of the cutting tool in the area of

Support body and its operation and effect on the cutting element is set forth in DE 10215004 B4, whose relevant embodiments are hereby expressly incorporated in the disclosure of the present patent applications.

However, the cutting tool according to the invention is not limited to include only one cutting element, but it can - especially at

rotationally symmetrical design of a tool shank - have at the periphery of a plurality of cutting elements, which are preferably in the manner described radially extendable and retractable. To achieve the object, a method for removing burr on a spatially extending edge at a first end of a hollow cylinder is further provided in which a cutting tool is positioned in relation to the edge to be deburred such that at least a portion of a cutting edge of a cutting element the cutting tool in the longitudinal direction of the hollow cylinder covers the burr to be removed, and the cutting element rotatory relative to the hollow cylinder and in

Is moved in translation longitudinally of the hollow cylinder, so that the cutting edge of the cutting element, the spatially extending edge of the hollow cylinder at least

departing in sections and at least partially cutting off the ridge there.

Before the actual deburring operation, the cutting element may e.g. be applied with a point of the cutting edge to the inner wall of the hollow cylinder, not excluding the case in which the tool is already rotating to approach the edge to be deburred.

The rotation of the cutting element takes place simultaneously with the translation. The spatial edge is shaped three-dimensionally, that is, it stretches in the x, x, and z directions of a Cartesian coordinate system. This edge is traversed at least in sections and preferably completely. This means that the movement of the cutting edge in relation to the edge provided with the ridge is three-dimensional, namely simultaneously in rotational and translational movement, wherein the cutting edge of the

three-dimensional shape of the edge follows.

The translatory feed is preferably 0.05-0.1 mm per revolution.

The preferred feed movement takes place here only in the direction of the translational feed. This means that for the purpose of burr removal, the cutting element in

Moving essentially on the trajectory of a space curve whose projection into a plane that runs parallel to the planes between which the space curve of the edge to be deburred runs, the contour also corresponds to the projection of this edge in the parallel plane.

In a preferred embodiment of the method, it is provided that the burr to be removed is located on an edge extending spatially at a first end of an inner side of a hollow cylinder, in particular on an edge formed by intersecting bores, from which it is removed.

In this case, the variant of the method is not excluded, in which the inventive method on the outside of an object, in particular a cylinder is performed, in which case the hollow cylinder, for example in the form of a bore, extends through the cylinder, in particular extends radially through the cylinder. A burr arising during the radial introduction of the bore or the hollow cylinder into the solid cylinder can be removed by the rotational movement taking place simultaneously in the longitudinal direction of the hollow cylinder. This means that here the ridge is not on one on an inside of a

Hollow cylinder spatially extending edge is removed, but on an outer side of the hollow cylinder or the bore and thus substantially on the outside of the

Cylinder.

With the method according to the invention, it is possible to deburr in an optimal manner a three-dimensionally extending edge, such as is formed, in particular, by bores which pass obliquely through and / or crossing one another. The method is not limited to the processing of pipes connected to each other, but can also be used on bodies or objects whose insides are hollow cylindrical, but the outer sides can have almost any shape.

The cutting tool can be retracted by a second end of the hollow cylinder, which faces the first end of the hollow cylinder, said first end of the hollow cylinder having the ridge to be removed and ends in a further bore or a further hollow cylinder, so that the second end of the hollow cylinder This further bore or this further hollow cylinder is arranged at a distance from one another.

The rotational and translational movement of the cutting element relative to

Hollow cylinder can be carried out in that the hollow cylinder or the workpiece is fixed and the cutting element is moved rotationally and translatorily. However, it is not excluded the alternative in which at least one of the movements of rotation and translation of the hollow cylinder or workpiece is performed and in this movement, the cutting element is fixed or performs an opposite movement. As a result, there is a control technology between the rotation and the translation

Context, which is preferably carried out via a three- or five-axis control. As a result, the three-dimensional edge can be traveled at least in sections in its three-dimensional course, wherein preferably the edge is completely traversed.

By means of rotational and translational movements, the method is therefore particularly suitable for removing the burr at an edge formed by two intersecting bores, the bores enclosing an angle α of less than 90 °. The resulting Durchdringungskante in the larger tube has the shape of an oval in plan view, wherein at an angle α of 90 ° between the holes of this oval is a circle. The oval edge with the ridge runs between a maximum Plane passing through the maxima of the edge curve and a minima plane passing through the minima of the edge curve, the maxima plane and the minima plane being perpendicular to the plane in which the angle α is between the hollow cylinders is, but parallel to each other.

Preferably, the rake surface of the cutting element is guided substantially perpendicular to the tangent at the point of contact of the cutting edge of the cutting element with the spatially extending edge. This substantially vertical guidance of the rake face of the cutting element should be realized in such a way that the rake face occupies an angle of 75 ° to 100 °, preferably between 87 ° and 93 °, to the tangent.

In a further advantageous embodiment of the method is provided that a

Cutting edge forming edge of the cutting element is formed protruding and is moved so that at the point of contact of the cutting edge of the

Cutting elements with the burr normal to the cutting edge applied parallel to the

Extension direction of the ridge runs. If the cutting edge by linear

Cutting segments is formed, this normal is perpendicular to the respective linear edge segment edge in the direction of the extension of the ridge. If the cutting edge is formed by a curved cutting segment or by a plurality of curved cutting segments, this normal is perpendicular to a tangent which bears against the curved cutting edge at the point of contact of the curved cutting segment with the burr, and thus also extends in the direction of the extent of burr. The ridge extension direction is the direction in which the ridge protrudes, starting from the spatially extending edge. The said normal is thus aligned with the burr extension direction.

The protruding cutting edge can have a curved edge, so that the cutting edge has a convex course. In the case of linear cutting segments which form the cutting edge, the cutting edge thus protrudes angularly.

Preferably, a maximum angular deviation between the normal and the grater extension direction of 5 ° is tolerable.

To position the cutting tool before the actual start

Spanungsvorgangs is provided in one embodiment of the method, that the cutting tool is moved in the longitudinal direction of the hollow cylinder beyond the first end and then the cutting edge of the cutting element to the

removing ridge created or applied to the traversing edge extending. That is, the cutting tool is retracted by a second end of the hollow cylinder, which is opposite to the first end of the hollow cylinder. When the first end of the hollow cylinder is below the second end, the Driven cutting element to a position below the edge to be deburred and then moved back towards the second end, so that the cutting edge on the

Bottom of the first end is applied to the edge to be deburred. Thereafter, the chipping process can be started by moving the chipper tool in a rotational and translatory manner. In a guided transversely through the hollow cylinder cross-section with the viewing direction from the second end in the direction of the first end of the hollow cylinder thus the cutting element is superimposed by the ridge.

That is, only after the positioning of the cutting element from the second end of the hollow cylinder from behind the first end of the rotation and

Translational movements are initiated, which cause the removal of the burr, wherein the force acting on the burr cutting force is generated by a tensile force acting in the cutting tool.

In an alternative embodiment of the method is before the beginning of the actual

Zerspanungsvorgangs brought the cutting element from the outside to be deburred to the hollow cylinder or at the burr to be removed, positioned accordingly and then the cutting process to remove the burr is started. That is, the cutting force acting on the burr is generated by a pressing force acting in the cutting tool.

In a preferred embodiment of the method, it is provided that the translation of the cutting element taking place simultaneously with the rotation of the cutting element takes place substantially continuously in the direction of the flash foot. That is, the translation is preferably carried out at the same speed, with maximum

Speed variations of 20 percent are still tolerable. This continuous movement can also be realized by a plurality of individual translational steps.

When defining a Cartesian coordinate system with the z-axis in the direction of the longitudinal axis of the hollow cylinder and the x- and y-axes parallel to the minimum and maximum planes between which the spatially extending edge is arranged, per revolution of the cutting tool is preferably a Delivery in z-direction from 0.01 mm to 1 mm, in particular from 0, 1 mm to 0.5 mm. It has been found that the translational movement should preferably be between 0.1 mm / min to 10 mm / min, preferably 0.6 mm / min.

The rotational speed should preferably be between 1 min ^"1 and 1000 min ^{" 1} ,

preferably between 30 min ^"1 and 200 min ^{" 1} , in particular 120 min ^"1 , wherein the rotational speed of the angle of inclination of the planes between which the spatially extending edge is arranged, with respect to the longitudinal axis of the hollow cylinder is dependent. In this case, with respect to an angle range of 0 ° to 90 ° between the planes between which the spatially extending edge is arranged, and the longitudinal axis of the hollow cylinder that the rotational speed of rotation is greater, the greater the angle α between the intersecting Hollow cylinders is. Preferably, a ratio of the angle α to the rotational speed ω of: α / ω = 0.09 to 0.25 [rad min].

The method is usually carried out in such a way that each point of the spatially extending edge is traveled several times from the cutting edge of the cutting element.

Furthermore, it is advantageously provided that the cutting tool a

Tool shank having a longitudinal extent, wherein the cutting element is mounted substantially vertically displaceable relative to a longitudinal axis extending in the direction of the longitudinal extent and the rotation about the longitudinal axis of the

Tool shank done.

In an alternative embodiment of the method, it is provided that the

The cutting tool has a tool shank with a longitudinal extension, wherein the cutting element is mounted substantially vertically displaceable with respect to a longitudinal axis extending in the direction of the longitudinal extent, wherein the rotation takes place about an axis of rotation which is parallel and spaced from the longitudinal axis of the

Tool shank is arranged.

For both process variants, it holds that the cutting edge is relative to the longitudinal axis of the

Zerspanungswerkzeugs is preferably mounted radially displaceable. At a distance of the longitudinal axis of the cutting tool or the tool shank to

Rotation axis, this distance can be theoretically unlimited size, where he

Preferably, the difference of the maximum longitudinal extent of the shaped as an oval-shaped extending edge and the distance of the maximum extended cutting edge of the cutting segment with respect to the longitudinal axis of the cutting tool corresponds.

In a further advantageous embodiment of the method, it is provided that, during the deburring process, the cutting element is displaced substantially perpendicularly with respect to the longitudinal axis, possibly with an angular movement of 5 °. This can be realized in particular by the fact that the cutting tool has a support body, with which the cutting element is mechanically supported or supported, and which is suitable due to its elasticity to realize such adjustment movement of the cutting element. Alternatively, the cutting tool has a fluid supply device, with which the cutting element is exposed to a static and / or dynamic fluid, so that the cutting element moves. This means that an existing preferably of an elastomeric material support body, a support surface in a breakthrough of the Tool shank movably arranged cutting elements and thus supports the cutting element with a force radially.

Alternatively, a liquid or gaseous material compressed under pressure into a through bore of the tool shank and / or consisting of a gas-liquid mixture moves the cutting element outwards. When the fluid pressure is reduced and due to a restoring force in the cutting region, it is therefore also possible for the separating element to retract radially.

In a further advantageous embodiment of the method is provided that the

Cutting tool has a plurality of cutting elements, wherein during the

Rotation movement and after conditioning of the cutting edge of the cutting elements of the cutting edge to be removed or to be traversed spatially extending edge at least one cutting edge constantly in the ridge or at the edge is engaged. The several

Cutting elements are arranged substantially regularly on the circumference of the tool shank of the cutting tool. The cutting elements are preferably in

described manner radially extendable and retractable.

In a further advantageous embodiment of the method, the respective cutting element on a second cutting edge, which adjoins a first end of the first cutting edge and extends at an angle of 90 ° to 130 ° with respect to the region of the first cutting edge on which the second cutting edge is connected, and / or that a respective cutting element has a third cutting edge, which adjoins a second end of the first cutting edge, wherein the third cutting edge and the region of the first cutting edge, to which the third cutting edge is connected, an angle of 90 ° include up to 130 °, and that

A method of removing burrs at a first end of a burr

Hollow cylinder spatially extending edge in a secondary hollow cylinder, which leads into a main hollow cylinder, and then the cutting tool is inserted into the main hollow cylinder and the second or third cutting edge on the edge between the main hollow cylinder and the side Hollow cylinder is removed. The

Implementation of this method is particularly advantageous if the

The radius of curvature of the ridge-edged edge is so small that the

Cutting element due to a necessary thickness can not extend the entire edge, but forms a secant in this curvature in particularly narrow curved areas. By arranging the second and the third cutting edge of the main cylinder of the ridge in the region of the resulting secant can be separated with the same tool with which the processing of the ridge was made from the secondary cylinder.

To solve the problem, a computer program is provided in addition, which provides a program code for performing all the method steps according to one of preceding claims, when the computer program is executed in a computer. This means that software also forms part of the teaching according to the invention if this software is suitable for carrying out the method steps according to the invention, if this software is realized by a control device which performs the function of a computer.

The invention will be explained below with reference to the embodiments illustrated in the accompanying drawings.

Show it

1 shows an inventive cutting tool in different designs and views,

FIG. 1 a: a first embodiment of the cutting tool according to the invention in a view from one side,

1 b shows a sectional view of the cutting tool according to the invention along the section D-D according to FIG. 1 a, FIG.

FIG. 1c shows a sectional view of the cutting tool according to the invention along the section E-E in FIG. 1a, FIG.

FIG. 1 d: A cutting tool according to the invention for carrying out the invention

inventive method in a second embodiment,

FIG. 1 e: a first frontal view of the cutting tool shown in FIG. 1 d,

FIG. 1f: a second frontal view of the cutting tool shown in FIG. 1d,

FIG. 1 g: a sectional view along the section B-B through the cutting tool illustrated in FIG. 1 d,

FIG. 1 h: a sectional view along the section A - A through the cutting tool illustrated in FIG. 1 d,

FIG. 1 i: a plan view of the cutting tool illustrated in FIG. 1 d,

FIG. 1j: a sectional view along the section C-C through the cutting tool illustrated in FIG. 1d,

FIG. 2: Two hollow cylinders crossing one another in a side view,

FIG. 3: the enlarged detail X from FIG. 2,

FIG. 4 shows a plan view of the connecting edge between the intersecting hollow cylinders illustrated in FIGS. 2 and 3; 5 shows an illustration of the cutting tool according to the invention when deburring an obtuse-angled region of the edge, FIG.

FIG. 6 shows an illustration of the cutting tool according to the invention during deburring of an acute-angled region of the edge;

Figure 7: An illustration of a cutting tool according to the invention in the

Removal of burr an acute-angled area of the edge,

8 shows an illustration of the cutting tool when deburring an edge of intersecting bores, FIG.

9 shows an illustration of the cutting tool in the removal of burr on solid material penetrated by a bore in a first position, FIG.

FIG. 10: A representation of the cutting tool in the removal of burr on the solid material penetrated by the bore, with reference to FIG. 9

opposite side.

In order to explain the cutting tool according to the invention which preferably carries out the method according to the invention, reference is initially made to FIG. 1 with the views and embodiments shown in the individual illustrations a - j.

According to FIG. 1 a, the cutting tool Z comprises a cutting element 1, which is essentially projecting in relation to a tool shank 70.

The cutting element 1 is defined in its projecting region by a first cutting edge 10, which is delimited by a cutting edge 14, so that the first cutting edge 10 has a first end 1 1 and opposite a second end 12.

In the figure 1 a illustrated embodiment is clearly a first, linear running cutting segment 20 and a second, also linearly executed second

Cutting segment 30 recognizable. The first cutting segment 20 and the second

Cutting segment 30 are through a central portion of the first cutting edge 40

separated from each other, which also runs substantially linear, and which is configured in the present embodiment as a third cutting segment 41.

The length of the first cutting edge Ls is at least twice as long as the length of the central region Lz. The length of the first cutting edge Ls may in particular be between 1.5 and 2 mm, and the length of the central region Lz may be between 0.6 and 1 mm.

However, the cutting tool is not limited to linear cutting segments 20,30 that these cutting segments 20,30 from each other by a third Cutting segment 41 are separated, but it may also be designed such that the first cutting segment 20 and the second cutting segment 30 are connected directly to each other in the central region of the first cutting edge 40 to each other. In Figure 1 d is another embodiment of the invention

Zerspanungswerkzeugs Z shown, in which, however, the first cutting edge 10 has a convex arcuate course 13, so that the first cutting segment 20 and the second cutting segment 30 are designed convexly arcuate. Also in this

Embodiment exists in the central region of the first cutting edge 40, a third

Cutting segment, which is preferably also arcuate in arcuate first and second cutting segments 20,30.

In the central region of the first cutting edge 40 is in both embodiments

Reinforcing element 42 is arranged, but not up to the cutting edge 14th

zoom ranges.

In both of the embodiments shown in FIGS. 1 a and 1 d, the first cutting segment 20 has a first wedge angle 21 and the second cutting segment 30 has a second wedge angle 31. As can be seen in particular from FIG. 1 i, when the plane of the cutting element 1 is guided substantially perpendicularly through the first wedge angle 21, a first free surface 23 is formed on an edge to be deburred, and a second free surface 33 is formed by the second wedge angle 31. These

Open spaces are also the side views shown in Figures 1 e and 1f

removable.

FIG. 1j shows that the first cutting edge 10 essentially extends between a first plane E1 and from a second plane E2. The first wedge angle 21 on the first cutting segment 20 opens in this case to the second plane E2, and the second wedge angle 31 on the second cutting segment 30 opens to the first plane E1. That is, the two wedge angles 21, 31 are oppositely opened with respect to the third plane E3 extending between the first plane E1 and the second plane E2.

The bisecting line of the first wedge angle extends in an angular range of 120 ° to 160 ° with respect to the third plane, and the bisector of the second wedge angle extends in an angular range of 300 ° to 340 ° with respect to the third plane E3.

Accordingly, a first wedge angle 21 is formed at the first end of the first cutting edge 10 and a second wedge angle 31 is formed at the second end 12 of the first cutting edge 10, wherein the two wedge angles 21, 31 are aligned such that the cutting tool can be used in opposite directions of rotation, being in a first

Direction of rotation to bring the first cutting segment 20 is to be engaged, and in the second, opposite direction of rotation, the second cutting segment 30 is to be engaged. In the embodiment of the cutting tool Z shown in FIG. 1a, it is shown that a second cutting edge 50 adjoins the first end 1 1 of the first cutting edge 50 which, in the embodiment shown here, is slightly curved, but not limited thereto, but also linear can.

At the second end 12 of the first blade 10 is followed by a third blade 60, which is executed in the embodiment shown here is substantially linear, however, similar to the second blade also connected with a bow portion of the first blade 10.

FIG. 1 b shows the section along the course D-D in FIG. 1 a, the rake face 51 of the second cutting edge 50 being visible here.

Similarly, FIG. 1c shows the section along the section E-E in FIG. 1a, so that here the rake face 61 of the third cutting edge 60 can be seen. It can also be seen that the second cutting edge 50 as well as the third cutting edge 60 are each provided with a wedge angle smaller than 90 °.

The length L and the width B of the respective rake face 51, 61 should each be greater than or equal to 0.2 mm. Likewise, the height H should be more than 0.2 mm.

In Figure 2, two intersecting hollow cylinder, which may be carried out for example by drilling, shown in which the inventive method

is to perform. It is obvious that a so-called auxiliary hollow cylinder 100 crosses a main hollow cylinder 200 at an acute angle or dips into it. In this case, a first end 101 of the auxiliary hollow cylinder 100 abuts against the main hollow cylinder 200. On the other hand, a second end 102 of the sub-hollow cylinder 100 is away from the main hollow cylinder 200. The longitudinal axes of the slave hollow cylinder 100 and the main hollow cylinder 200 include an angle α.

In Figure 3 is an enlarged view of the indicated in Figure 2 cutout X can be seen, here clearly a ridge 400 can be seen, which connects with its Gratfuß 401 formed on the side between the hollow cylinder 100 and main hollow cylinder 200 edge 300.

This edge 300 is clearly visible again, omitting the drawings of the secondary hollow cylinder 100 in a plan view of the main hollow cylinder 200 in FIG.

The oval-shaped edge 300, results from the fact that the auxiliary hollow cylinder 100 is connected at an acute angle to the main hollow cylinder 200.

As can be seen from FIG. 2, the edge 300 has a three-dimensional course in this acute-angled arrangement, so that it has a first maximum 301 and an opposite one second maximum 302 forms, and substantially offset by 90 °, a first

Minimum 303 and a second minimum 304. That is, in the embodiment illustrated here, the oval-shaped edge 300 is arranged between a maximum plane 305, in which the first maximum 301 and the second maximum 302 are arranged, and a minimum plane 306, in which the first minimum 303 and the second minimum 304 are arranged runs.

FIGS. 5 to 7 show individual steps of the method according to the invention, which is carried out with the illustrated cutting tool according to the invention.

In Figure 5 it is shown that the cutting tool Z was retracted by the second end 102 of the auxiliary hollow cylinder 100 in this and with the first

Cutting segment 20 at the edge 300 is engaged, in which case the obtuse-angled portion of the edge 300 is traversed. In this case, the Zerspannungswerkzeug Z rotates about the axis of rotation 500 shown. At the same time leads to this rotation that

Cutting tool Z from a translational movement 600 along the axis z, in order to remove the three-dimensionally extending edge 300 shown in Figures 2 and 4.

In FIG. 6, the cutting tool Z is shown substantially rotated by 180 ° in a position shown in relation to FIG. It can be seen that further the second cutting segment 30 acts on the edge 300 in the acute-angled region. Upon further rotation of the cutting tool Z, this is again in

Translation direction 600 along the coordinate z to move back.

From a synopsis of Figures 5 and 6 it can be seen that in order to bring the first cutting segment 20 and the second cutting segment 30 into engagement, the direction of rotation of the cutting tool Z is to turn over, so that the respective wedge angle 21, 31 the respective cutting process in the ridge 400 can execute.

FIG. 7 shows a further method aspect of the method according to the invention, in which the cutting tool Z, here designed only with linear cutting segments 20, 30, is not brought into engagement with the edge 300 in the secondary hollow cylinder 100, but in the main hollow cylinder 200 In the situation illustrated here, the third cutting edge 60 is in engagement with the edge 300 or with the burr 400 present thereon. By a rotation of the cutting tool Z, burr 400 can be at this point of the edge 300, at which also the second maximum 302 is present, remove. In a corresponding manner, upon further translation of the cutting tool Z in the longitudinal direction of the main hollow cylinder 200, the second cutting edge 50 can be brought into engagement with the edge 300 in the region in which the first maximum 301 is present and the two hollow cylinders 100, 200 obtuse each other bump. FIG. 8 shows the embodiment of the method according to the invention with the preferably used cutting tool according to the invention in the removal of burrs on an edge passing through holes penetrating one another, in the case of FIG

Penetration of the main hollow cylinder 200 with the auxiliary hollow cylinder 100, has arisen.

It can be seen here that the cutting tool Z has been moved into a position by the secondary hollow cylinder 100, in which the cutting tool Z abuts the edge 300, which is realized by the immersion of the lower secondary hollow cylinder 100 in the main hollow cylinder 200 , In this case, the cutting tool engages with the second cutting segment 20 with the edge 300. Also in this process embodiment, the spatially extending edge 300 is deburred by simultaneous rotation and translation of the cutting tool, wherein the cutting tool Z follows substantially the contour of the edge 300. From this it can be seen that the same cutting tool can be used which likewise has the features shown in FIGS. 5 to 7

Implemented method embodiments, wherein only on the basis of the preferably oppositely directed wedge angle on the cutting tool Z, the direction of rotation is reversed. The present invention is not limited to the fact that a cutting tool is used with oppositely executed wedge angle, but optionally can be realized on the first cutting edge 10 aligned to the same page wedge angle.

FIGS. 9 and 10 show a method embodiment in which the

Cutting tool on only one on a round solid material 700 through

Penetration with a side hollow cylinder 100 formed edge 300 is used. From Figure 9 it can be seen that while the Zerspanungswerkzeug Z at his

Submersible movement in the direction of the coordinate z opposite edge 300 is processed with the first cutting segment 20.

After passing through the auxiliary hollow cylinder 100 with the cutting tool Z to the opposite side of the solid material 700, the edge 300 present here can also be machined with the same cutting tool Z, with the second cutting segment 30 now engaging the edge 300 as shown , Also in the process embodiments shown in FIGS. 9 and 10, this leads to

Zerspanungswerkzeug Z at the same time a translational and a rotational movement to follow the spatial path of the edge 300 and remove there existing burr.

However, the present invention is not limited to the positions or movements of the cutting tool Z shown in FIGS In the deburring process, the tool may also be positioned with respect to the solid material 700 such that the axis of rotation of the cutting tool Z is substantially perpendicular to the top or to a tangent to a cross section of the solid material 700 at its top point.

LIST OF REFERENCE NUMBERS

Cutting tool Z

Cutting element 1 first cutting edge 10 first end of the first cutting edge 1 1 second end of the first cutting edge 12 convex arcuate course 13th

Cutting edge 14 first cutting segment 20 first wedge angle 21st

Bisector of the 1. Wedge angle 22 first free surface 23 second cutting segment 30 second wedge angle 31st

Bisector of the second wedge angle 32 second free surface 33 central portion of the first cutting edge 40 third cutting segment 41st

Reinforcement element 42 second cutting edge 50th

Rake face of the second cutting edge 51 third cutting edge 60

Rake face of the third cutting edge 61 first plane E1 second plane E2 third plane E3 Tool shank 70

Secondary hollow cylinder 100 first end of the auxiliary hollow cylinder 101 second end of the auxiliary hollow cylinder 102nd

Main hollow cylinder 200

Edge, Oval 300

First maximum 301 Second maximum 302

First minimum 303 second minimum 304

Maxima level 305

Minima level 306

Burr 400

Gratfuß 401

Rotation axis 500

Translation 600

Solid material 700

Angle α

Length L

Width B

Height H

Length of the first cutting edge Ls length of the central region Lz

Claims

claims

1 . Cutting tool (Z), in particular for deburring edges (300) in cavities, comprising at least one cutting element (1) with a projecting first cutting edge (10) whose cutting edge (14) extends between two substantially parallel planes (E1, E3), wherein the first cutting edge (10) has at least one first cutting segment (20) and a second cutting segment (30) arranged at the respective end regions (11, 12) of the cutting edge (14), and wherein the first cutting segment (20). a first wedge angle (21) and the second cutting segment (30) has a second wedge angle (31), wherein a minimum of the first wedge angle (21) and the second wedge angle (31) is less than 88 °, and the free surfaces (23 , 33), which are formed by the respective wedge angle (21, 31), each facing one of the two parallel planes (E1, E3).

2. Cutting tool according to claim 1, characterized in that the first

Cutting edge (10) between the first cutting segment (20) and the second

Cutting segment (30) has a third cutting segment (41) whose wedge angle is greater than the largest wedge angle (21, 31) of the first cutting segment (20) and the second cutting segment (30).

3. Cutting tool according to claim 2, characterized in that the length of the third cutting segment (41) is shorter than the shortest length of the first

Cutting segment (20) and the second cutting segment (30).

4. Cutting tool according to one of the preceding claims, characterized

in that the first cutting edge (10) has a convex arcuate course (13), so that the first cutting edge segment (20) and the second cutting edge segment (30) are of convex arcuate design.

5. Cutting tool according to one of the preceding claims, characterized

characterized in that the wedge angle (21, 31) in the course of a respective

Cutting segment (20, 30) from the end of the cutting segment in the direction of the central region (40) of the first cutting edge (10) increases.

6. Cutting tool according to one of the preceding claims, characterized in that the cutting element (1) has a second cutting edge (50) which adjoins a first end (1 1) of the first cutting edge (10) and at an angle of 90 ° extends to 130 ° with respect to the region of the first cutting edge (10) to which the second cutting edge (50) is connected.

7. Cutting tool according to one of the preceding claims, characterized

characterized in that the cutting element (1) has a third cutting edge (60) adjoining a second end (12) of the first cutting edge (10), the third cutting edge (60) and the region of the first cutting edge (10) where the third cutting edge (60)

connected, include an angle of 90 ° to 130 °.

8. Cutting tool according to one of the preceding claims, characterized

characterized in that the cutting tool (Z) has a tool shank (70) with a longitudinal extension, wherein the cutting element (1) is mounted substantially vertically displaceable in relation to a longitudinal axis extending in the direction of the longitudinal extent.

9. A method for the removal of burr (400) on a at a first end (101) of a hollow cylinder (100) spatially extending edge (300, wherein a

Cutting tool (Z), in particular a cutting tool according to one of claims 1 to 8, is positioned in relation to the edge to be deburred such that at least a portion of a cutting edge (14) of a cutting element (1) of

Cutting tool (Z) in the longitudinal direction of the hollow cylinder covers the burr to be removed, and the cutting element (1) relative to the hollow cylinder (100) is rotatory and in the longitudinal direction of the hollow cylinder (100) translationally, so that the cutting edge (14) of the cutting element (1 ) the at least partially abuts the spatially extending edge (300) of the hollow cylinder (100) and there located at least partially ridge (400).

A method of removing burrs (400) according to claim 9, characterized in that burrs are formed on a first end (101) of an inside of a burr Hollow cylinder (100) spatially extending edge (300), in particular burr (400) on an intersecting holes formed edge (300) is removed.

A method for chip removing burr as claimed in any one of claims 9 and 10, characterized in that the rake face of the cutting element (1) is substantially perpendicular to the tangent at the point of contact of the cutting edge (14) of the cutting edge

Cutting elements (1) with the extending edge (300) is guided.

12. A method for chip removal of burr according to one of claims 9 to 1 1, characterized in that a cutting edge (14) forming the cutting edge (10) of the cutting element (1) is formed protruding and is moved such that a at the contact point of Cutting edge (14) of the cutting element (1) with the ridge (400) to the cutting edge (14) applied normal parallel to the extension direction of the ridge (400).

The method for chip removal according to any one of claims 9 to 12, characterized in that the hollow cylinder (100) has a second end (102) facing the first end (101) and the cutting tool (Z) in the Hollow cylinder (100) is retracted by the second end (102), wherein the

Cutting element of the cutting tool (Z) in the longitudinal direction of the hollow cylinder (100) beyond its first end (101) is moved out and then the cutting operation to remove the burr is started.

14. A method for chip removal of burr according to one of claims 9 to 13, characterized in that at the same time to the rotation of the cutting element (1) occurring translation of the cutting element (1) in the direction of the flash foot (401) takes place substantially continuously.

15. Computer program with program code for carrying out all method steps according to one of claims 9 to 14, when the computer program is executed in a computer.