DE102019209962A1 - Cutting body and drilling or chiseling tool with a cutting body - Google Patents

Abstract

The invention relates to a cutting body for a drilling or chiselling tool, comprising a base body which has a first cutting edge and a second cutting edge, the cutting edges each having a starting point and an end point, the first cutting edge at least two pitch change points and the second cutting edge at least two having corresponding slope change point, with a first plane that intersects the first cutting edge, and a second plane that intersects the second cutting edge, wherein a straight line of intersection of the first and the second plane runs perpendicular to a central axis of the cutting body, the first plane and the second Plane have the same angle to the central axis and the first slope change point and the second slope change point are arranged on different sides of the first plane and the first corresponding slope change point and the second corresponding slope change point are arranged on different sides of the second plane, wherein a first distance of the first slope change point from the first plane corresponds essentially to a first corresponding distance of the first corresponding slope change point from the second plane. It is proposed that a center point between the first slope change point and the first corresponding slope change point is arranged at a distance from the central axis.

Description

Disclosure of the invention

The invention relates to a cutting body for a drilling or chiseling tool, comprising a first cutting edge and a second cutting edge, the cutting edges each having a starting point and an end point, the first cutting edge having at least two pitch change points and the second cutting edge having at least two corresponding pitch change points, with a first plane that intersects the first cutting edge, and a second plane that intersects the second cutting edge, a straight line of intersection of the first and second planes running perpendicular to a central axis of the cutting body, the first plane and the second plane forming the same angle of the central axis and the first slope change point and the second slope change point are arranged on different sides of the first plane and the first corresponding slope change point and the second corresponding slope change point on different sides th of the second level are arranged, wherein a first distance of the first slope change point from the first plane substantially corresponds to a first corresponding distance of the first corresponding slope change point from the second plane. It is proposed that a center point between the first slope change point and the corresponding first slope change point is arranged at a distance from the central axis. A particularly high removal efficiency can advantageously be achieved by such a cutting body.

The drilling tool is designed in particular as a rock drill which is provided for a hammer drill. Alternatively, it is also conceivable that the drilling tool is designed as a metal drill or as a tile drill. The chisel tool can for example be designed as a tile chisel, a gouge, a channel chisel, a pointed chisel, a flat chisel, a wing chisel, a joint chisel, a chisel, a tooth iron, a shovel chisel or an asphalt chisel and is intended in particular for a chisel or hammer.

At its end facing away from the cutting body, the drilling or chiselling tool has an insertion end which is designed for coupling to a hand-held power tool, such as a hammer drill or percussion hammer. The drilling or chiselling tool is preferably designed in the area of the insertion end in such a way that the drilling or chiselling tool can be coupled to a tool holder of the hand-held power tool. For example, the drilling or chiseling tool can have form-locking elements designed as special grooves in the area of the insertion end, which form an SDS-plus interface or an SDS-max interface. To machine a workpiece, the drilling tool is put into a rotating and linearly oscillating or impacting state by means of the hammer drill. The drilling or chiseling tool penetrates the workpiece in the feed direction during machining. The feed direction of the drilling or chiselling tool runs coaxially to the longitudinal axis or axis of rotation and, starting from the insertion end, in the direction of the cutting body. The longitudinal axis of the drilling or chiselling tool corresponds in particular to a working or rotational axis of the drilling or chiselling tool.

The cutting body can be formed in one piece with the base body of the drilling or chiseling tool. Alternatively, it is also conceivable that the cutting body is formed in one piece with the base body of the drilling or chiseling tool. The cutting body has a tip with which the drilling or chiseling tool is placed or applied to the workpiece to be machined when in use. The tip can be designed, for example, as a transverse cutting edge. The cutting body is formed in particular from a hard metal. The cutting body preferably has a higher hardness than the base body.

The first and the second cutting edges are preferably designed as main cutting edges. In particular, the cutting edges each form a transition between a rake face and a free face. The two cutting edges are in particular arranged on different sides of the cutting body, the sides being separated by a plane along the central axis of the cutting body. The cutting edges extend, at least in sections, essentially in a straight line. The wedge angle of the first and / or the second cutting edge is in particular in a range between 60 ° and 120 °, preferably in a range between 80 ° and 100 °. The wedge angle is preferably essentially 90 °. The wedge angle of the first cutting edge and the second cutting edge is preferably essentially at least partially, preferably completely, identical. The starting point of the cutting edge is particularly in the area of the tip. The starting point preferably at least partially forms the tip of the cutting body. The end point of the first cutting edge and / or the second cutting edge is preferably arranged on a radially outer edge of the cutting body.

In the context of this application, under the “central axis” of the cutting body in particular a geometric center axis in the plan view of the cutting body can be understood. The central axis is preferably also the axis of rotation about which the drilling or chiselling tool can be rotated during operation. The straight line of intersection is preferably arranged in such a way that it intersects the central axis of the cutting body.

The first plane is preferably arranged such that it only intersects the first cutting edge and the second plane is arranged such that it only intersects the second cutting edge.

The pitch change points are arranged at a transition between two essentially straight sections of the cutting edges. In particular, the pitch change point of the first cutting edge is arranged essentially at the same level as the corresponding pitch change point of the second cutting edge. In this context, “at the same height” should be understood to mean that a plane perpendicular to the central axis of the cutting body intersects both the pitch change point and the corresponding pitch change point, wherein the pitch change point and the corresponding pitch change point can also be a small distance from the plane that is preferably less than 10% of the extent of the cutting edge along the central axis.

The distance of the slope change point from the first plane or the corresponding distance of the corresponding slope change point from the second plane is in particular a shortest distance. Alternatively, however, it is also conceivable that the distance or the corresponding distance is a distance along a perpendicular to the central axis of the cutting body. In the context of this application, a distance and a corresponding distance that correspond to one another are to be understood as meaning, in particular, two distances that differ from one another by at most 15%, preferably differ from one another by no more than 8%, and are preferably essentially the same.

Furthermore, it is proposed that a second distance of the second incline change point from the first plane essentially corresponds to a second corresponding distance of the second corresponding incline change point from the second plane. The removal rate can advantageously be increased further in this way.

It is also proposed that only the first slope change point or only the second slope change point of the first cutting edge is designed as a cutting area of the first cutting edge. As a result, the removal rate of the cutting body can advantageously be increased locally and significantly. In the context of this application, a cutting area of the cutting edge is to be understood as meaning in particular an area which at least partially forms an envelope curve of the cutting body when it rotates about the central axis and is thus provided for removal when used.

It is also proposed that either the pitch change point of the first cutting edge or the corresponding pitch change point are designed as a cutting area. Advantageously, the removal rate can be increased significantly on one side.

It is further proposed that the respective slope change points and corresponding slope change points are arranged rotationally symmetrical to the central axis. This advantageous arrangement further improves the removal rate and the stability of the cutting body.

The invention also relates to a drilling or chiseling tool with a cutting body as described above.

It is also proposed that the cutting body be designed in one piece with the drilling or chiselling tool or that it is connected to the drilling or chiselling tool in a materially bonded manner.

Furthermore, the invention relates in particular to a cutting body for a drilling or chiselling tool, comprising a base body which has a first cutting edge and a second cutting edge, the cutting edges each having a starting point and an end point, the first cutting edge at least one pitch change point and the second Cutting edge has at least one corresponding slope change point, a slope of the first cutting edge changing by X at the first slope change point. It is proposed that a slope of the second cutting edge changes by - (X +/- 10 °) at the corresponding slope change point. In this way, an opposing cutting edge profile can advantageously be implemented, via which the removal rate of the cutting body is increased locally.

The designation "X" is a variable in degrees. In particular, X lies in a range between 0 ° and 120 °, preferably in a range between 0 ° and 60 °, preferably in a range between 0 ° and 30 °.

It is further proposed that the starting point and / or end point of the respective cutting edge are arranged at essentially the same height.

It is also proposed that the cutting edges have at least two, preferably at least three, rectilinear sections, the sections transitioning in the area of the slope change point or the corresponding slope change point. It is also proposed that the first cutting edge have at least one cutting area and the second cutting edge have at least one cutting area, the cutting areas of the first cutting edge not axially overlapping with the cutting areas of the second cutting edge.

drawings

Further advantages emerge from the following description of the drawings. The drawings, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into useful further combinations. Reference symbols of features of different embodiments of the invention which essentially correspond are provided with the same number and with a letter identifying the embodiment.

• 1a eine Seitenansicht eines Bohrwerkzeugs mit einem erfindungsgemäßen Schneidkörper;
• 1b eine Draufsicht auf den Schneidkörper gemäß 1a;
• 1c eine perspektivische Ansicht des Schneidkörpers;
• 1d eine Seitenansicht des Schneidkörpers;
• 2a eine perspektivische Ansicht einer alternativen Ausführungsform des Schneidkörpers;
• 2b eine Seitenansicht des Schneidkörpers gem. 2a.

Show it:

• 1a a side view of a drilling tool with a cutting body according to the invention;
• 1b a plan view of the cutting body according to 1a ;
• 1c a perspective view of the cutting body;
• 1d a side view of the cutting body;
• 2a a perspective view of an alternative embodiment of the cutting body;
• 2 B a side view of the cutting body according to. 2a .

Description of the exemplary embodiments

In 1 a to 1d is a first embodiment of a cutting body according to the invention 10 shown.

In 1a is a drilling tool 100 with the cutting body 10 shown. The drilling tool 100 is designed as a rock drill, for example. The drilling tool 100 extends along a longitudinal axis 102 , which in this example is also an axis of rotation around which the drilling tool 100 is rotatable for operation in the state connected to a hand machine tool, such as a hammer drill (not shown). Along the longitudinal axis 102 instructs the drilling tool 100 a work area at its front end 104 on in which the cutting body 10 is arranged. The cutting body 10 is designed as a separate component that is firmly bonded to a base body 101 of the drilling tool 100 connected. The material connection takes place, for example, via a soldered connection. The basic body 101 consists for example of a tool steel. The cutting body 10 is designed in particular as a hard metal plate and consists of a hard metal. The cutting body 10 thereby advantageously has a greater hardness than the base body 101 , reducing the wear and tear in the work area 104 is reduced. In the work area 104 is in operation of the drilling tool 100 or the hand machine tool smashes or removes the material to be processed. The drilling tool has at its rear end 100 a spigot end 106 on. The plug-in end 106 is designed as a round shank and has a cylindrical shape. About the spigot end 106 is the drilling tool 100 connectable to a tool holder of the hand machine tool. Between the work area 104 and the male end 106 instructs the drilling tool 100 a transport area 108 for the removal of the cuttings or cuttings. In the transport sector 108 instructs the drilling tool 100 or the basic body 101 a spiral conveyor 110 on, which spiral around the longitudinal axis 102 on the outer surface of the base body 101 extends.

In 1b is the cutting body 10 in a plan view along a central axis 12th shown. The central axis 12th runs through the geometric center as an example 14th of the cutting body 10 in top view. The cutting body 10 can so with the drilling tool 100 be connected that the central axis 12th of the cutting body 10 coaxial to the longitudinal axis 102 of the drilling tool 100 runs. However, it is also conceivable that the cutting body 10 and the main body 101 of the drilling tool 100 are interconnected in such a way that the central axis 12th parallel to the longitudinal axis 102 is arranged.

In 1c is the cutting body 10 shown in a perspective view. The cutting body 10 has a tip 16 on. The summit 16 is exemplary as a cross cutting edge 18th educated. Furthermore, the cutting body 10 a first cutting edge 20th and a second cutting edge 22nd on. The first cutting edge 20th and the second cutting edge 22nd are over the cross cutting edge 18th connected with each other. The cutting edges 20th , 22nd each have a starting point 24 and an endpoint 26th on. The starting point 24 is exemplary in the field of top 16 of the cutting body 10 arranged. In particular is the starting point 24 in a transition area of the cutting edges 20th , 22nd to the cross cutting edge 18th arranged. The endpoints 26th the cutting edges 20th , 22nd are for example on the radially outermost area of the cutting body 10 arranged.

In 1d Figure 3 is a side view of the cutter body 10 shown. The first cutting edge 20th and the second cutting edge 22nd each have, for example, a single cutting area 28 on. In the cutting areas 28 these are areas of the cutting edges 20th , 22nd that is the envelope 30th of the cutting body 10 when rotating around the central axis 12th at least partially form. The cutting area 28 the first cutting edge 20th starts at the starting point 24 in the area of the tip 16 and ends about halfway up to the end point 26th . At the same height as the first cutting edge 20th the cutting area 28 has, has the second cutting edge 22nd essentially no cutting area 28 on. At the same height as the cutting area 28 the first cutting edge 20th ends, the cutting area begins 28 the second cutting edge 22nd . The cutting area 28 the second cutting edge 22nd ends at the end point, for example 26th the second cutting edge 22nd . Thus becomes the envelope 30th of the cutting body 10 essentially through two cutting areas 28 formed that do not overlap with each other.

By having the two on different cutting edges 20th , 22nd arranged cutting areas 28 do not overlap or are arranged at different heights, when machining the workpiece, for example when drilling or chiseling, the force does not act over the entire first and second cutting edge 20th , 22nd but only over part of the first cutting edge 20th and part of the second cutting edge 22nd . It is advantageous in these parts or in the cutting areas 28 this significantly increases the force, which increases the removal rate.

To such a geometry of the cutting edges 20th , 22nd to realize, point the cutting edges 20th , 22nd each have different sections which each extend essentially in a straight line. The first cutting edge 20th and the second cutting edge 22nd each have, for example, three rectilinear sections, at least one adjacent section, preferably both adjacent sections, having a different gradient. In this context, a slope is intended in particular to be an angle between the extent of the respective section and the central axis 12th of the cutting body 10 can be understood in the side view.

At the transition between two sections, the cutting body 10 a slope change point 32 on. The first cutting edge 20th thus has two slope change points 32 on. The second cutting edge 22nd also has three straight sections with different slopes and two corresponding slope change points 34 on. The slope change points 32 the first cutting edge 20th and the corresponding slope change point 34 the second cutting edge 22nd are arranged essentially at the same height.

At the first incline change point 36 the pitch of the first cutting edge changes 20th from 70 ° to X to 40 °, where X is about -30 °. Correspondingly, the slope changes at the first corresponding slope change point 37 the second cutting edge 22nd from 35 ° by -X +/- 10 ° to 72 °, and thus by approx. 37 °.

At the second incline change point 39 the pitch of the first cutting edge changes 20th from 40 ° to X to 70 °, where X is about 30 °. Correspondingly to this, the slope changes at the second corresponding slope change point 40 the second cutting edge 22nd by -X +/- 10 ° from 72 ° to 32 °, and thus by approx. -40 °.

The first grade change point 36 the first cutting edge 20th and the first corresponding slope change point 37 the second cutting edge 22nd , are at the first height 38 arranged. The second slope change point 39 the first cutting edge 20th and the second corresponding slope change point 40 the second cutting edge 22nd , are at a second level 41 arranged.

In order to achieve the highest possible removal rate, the slope change points are 32 and the corresponding slope change points 34 arranged such that a first level 46 who have made the first cutting edge 20th intersects, and a second level 48 who have made the second cutting edge 22nd intersects, with a straight line of intersection 50 the first and second levels 46 , 48 perpendicular to a central axis 12th of the cutting body 10 runs, with the first level 46 and the second level 48 the same angle to the central axis 12th have and the slope change points 32 on different sides of the first level 46 and the corresponding slope change points 34 on different sides of the second level 48 are arranged.

In particular, a first distance corresponds 52 of the first slope change point 36 from the first level 46 essentially a first corresponding distance 53 of the first corresponding slope change point 37 from the second level 48 . In addition, a second distance corresponds 55 of the second slope change point 39 from the first level 46 essentially a second corresponding distance 56 of the second corresponding slope change point 40 from the second level 48 . The specified distances can be as in 1d shown at distances of the points of change of slope from the planes perpendicular to the central axis 12th act. Alternatively, it would also be conceivable that the distances are the shortest distance between the points of change of slope and the planes, that is to say orthogonal to the planes.

Furthermore are the centers 58 between the slope change points 32 and the corresponding slope change points 34 from the central axis 12th spaced. Preferably the different centers are 58 as shown by way of example, in each case by the same distance 60 from the central axis 12th spaced.

In 2a and 2 B is an alternative embodiment of the cutting body 10 shown. The cutting body 10a has a first cutting edge 20a and a second cutting edge 22a on whose starting points 24a Corner points of a cross cutting edge 18a which in turn are the two cutting edges 20a , 22a connects.

The cutting edges 20a , 22a each have three straight sections, at their transition points of slope change 32a , 34a are arranged. The slope change points 32a the first cutting edge 20a and the corresponding slope change point 34a the second cutting edge 22a are arranged essentially at the same height. The slope change points are analogous to the previous exemplary embodiment 32a , 34a on different sides of levels 46a , 48a arranged whose line of intersection 50a the central axis 12th cuts perpendicularly.

The slope change points 32a and the corresponding slope change points 34a are arranged such that a first distance 52a of the first slope change point 36a from the first level 46a essentially a first corresponding distance 53a of the first corresponding slope change point 37a from the second level 48a corresponds. The distances 52a , 53a are measured perpendicular to the plane. In addition, a second distance corresponds 55a of the second slope change point 39a from the first level 46a essentially a second corresponding distance 56a of the second corresponding slope change point 40a from the second level 48a .

Furthermore are the centers 58a between the slope change points 32a and the corresponding slope change points 34a from the central axis 12a spaced. In this embodiment, the distances between the center points differ 58a from each other. In particular, it has the first slope change points 36a , 37a assigned first center point 62a a smaller distance than that of the second slope change points 39a , 40a associated second center point 64a . In particular, the second center point 64a a distance substantially twice as large as the first center point 62a on. The distance from the second center point is preferably 64a not less than the distance of the first center point 62a and no greater than three times the distance of the first center point 62a .

Claims (9)

Cutting body for a drilling or chiseling tool, comprising a first cutting edge (20) and a second cutting edge (22), the cutting edges (20, 22) each having a starting point (24) and an end point (26), the first cutting edge ( 20) has at least two pitch change points (32) and the second cutting edge (22) has at least two corresponding pitch change points (34), with a first plane (46) which intersects the first cutting edge (20) and a second plane (48) which the second cutting edge (22) intersects, a line of intersection (50) of the first and the second plane (46, 48) running perpendicular to a central axis (12) of the cutting body (10), the first plane (46) and the second plane (48) have the same angle to the central axis (12) and the first slope change point (36) and the second slope change point (39) are arranged on different sides of the first plane (46) and the first corresponding slope change eration point (37) and the second corresponding incline change point (40) are arranged on different sides of the second plane (48), a first distance (52) of the first incline change point (36) from the first plane (46) being essentially a first corresponding distance (53) corresponds to the first corresponding slope change point (37) from the second plane (48), characterized in that a center point (58) is arranged between the first slope change point (36) and the corresponding first slope change point (37) at a distance from the central axis (12) is. Cutting body after Claim 1 , characterized in that a second distance (55) of the second slope change point (39) from the first plane (46) essentially corresponds to a second corresponding distance (56) of the second corresponding slope change point (40) from the second plane (48). Cutting body according to one of the preceding claims, characterized in that only the first slope change point (36) or only the second slope change point (39) of the first cutting edge (20) is designed as a cutting area (28) of the first cutting edge (20). Cutting body according to one of the preceding claims, characterized in that either the pitch change point (32) of the first cutting edge (20) or the corresponding pitch change point (34) of the second cutting edge (22) are designed as a cutting area (28). Cutting body according to one of the preceding claims, characterized in that the straight line (50) intersects the central axis (12) of the cutting body (10). Cutting body according to one of the preceding claims, characterized in that the respective pitch change points (32) and corresponding pitch change points (34) are arranged rotationally symmetrical to the central axis (12). Cutting body according to one of the preceding claims, characterized in that the respective slope change points (32) and the corresponding slope change points (34) are arranged essentially at the same height. Drilling or chiseling tool with a cutting body (10) according to one of the preceding claims. Drilling or chiseling tool Claim 8 wherein the cutting body (10) is formed in one piece with the drilling tool (100) or is connected to the drilling tool (100) in a materially bonded manner.

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