DE202011050277U1 - drilling - Google Patents

Abstract

Drilling tool, with a base body (12), and with an interchangeable cutting element (14) which has at least one cutting edge (44), the base body (12) having an axial through-bore (16) and a receiving area (22) for receiving it at one end area of the cutting element (14), in a fastened state the cutting element (14) is received in the receiving area (22) and held on the base body (12), and wherein in a released state the cutting element (14) is removed from the base body (12) is solved, characterized in that a pin (20) is arranged in the through hole (16), which in the released state is arranged in a first position in which it protrudes by a preset length into the receiving area (22) in which Through hole (16) an elastic element (26) is arranged which holds the pin (20) in the first position, the cutting element (14) on the side (70) opposite the cutting edge (44) has a recess (40) exhibits in ...

Description

The invention relates to a drilling tool with a base body and an exchangeable cutting element having at least one cutting edge. The main body has an axial through hole and also at an end region a receiving area for receiving the cutting element. In a fixed state, the cutting element is received in the receiving area and held on the main body and released in a dissolved state of the main body.

In particular, for drilling hard materials drilling tools are needed, the cutting of very hard material. In this case, cutting made of high-speed steels (HSS), hard metals, ceramics, cubic boron nitride or polycrystalline diamond are used. These materials are compared to conventional tool steels, very expensive, so often only a cutting element, which is also referred to as a cutting head or insert, is made of these materials and the body of the drilling tool is made of inexpensive tool steel. Thus, in the case of wear of the cutting element, only this must be changed, whereas the main body can continue to be used. Thus, the costs incurred by the wear costs are significantly reduced.

From the prior art, a number of different methods are known as the cutting elements are attached to the body. A common way to attach the cutting element to the body is to screw it over one or more separate screws to the body. In this case, the screws can be screwed both in the axial and in the radial direction in the main body and the cutting element. Such drilling tools are for example from the documents EP 0 460 237 A1 . DE 195 43 233 A1 . WO 2010/106117 A1 . EP 0 298 061 A1 . EP 0 441 302 A2 and EP 0 348 371 A2 known.

Another widely used method for fastening the cutting element to the base body is to provide on the cutting element itself an external thread or at least a part of such an external thread, which is rotated in a complementarily formed internal thread of the base body. Such drilling tools are for example from the documents EP 1 200 222 B1 and DE 100 42 990 A1 known.

Further drilling tools with interchangeable cutting elements which are fastened to the base body in a similar manner as described above are, for example, from the documents DE 196 05 157 A1 . WO 2010/142411 A1 . DE 103 33 340 A1 . WO 00/25967 . DE 199 14 170 C1 . EP 0 508 468 A1 . EP 0 549 548 A1 . DE 42 39 257 A1 . DE 37 38 000 A1 and DE 44 35 857 A1 known.

The previously described methods for fastening the cutting element to the base body all have a number of disadvantages. On the one hand, a high expenditure of force is necessary for fastening and in particular for releasing the cutting element, so that the replacement is very complicated. On the other hand, most tools with replaceable cutting element require a tool for replacing the cutting element; Often even a special, intended only for the drilling tool special tool is used. Furthermore, it is disadvantageous that the screw-on cutting elements are expensive to produce. In particular, the threads of the screw-on cutting elements must be milled and / or ground in the cutting elements, which is associated with the materials used with great effort.

It is an object of the invention to provide a drilling tool in which a basic body and an exchangeable cutting element can be connected to one another in a simple manner and can also be separated from each other in a simple manner.

This object is achieved by a drilling tool having the features of claim 1. Advantageous developments of the invention are specified in the dependent claims.

According to the invention, the base body comprises a pin and an elastic element, which are arranged in the through hole. In the released state, the pin is held by the elastic element in the first position in which it protrudes by a preset length in the receiving area. The cutting element has on the opposite side of the cutting edge a recess into which the pin engages in the attached state, wherein the pin is arranged in the attached state in a second position in which it counteracts a restoring force of the elastic element relative to the first position is pushed further into the through hole. Furthermore, the cutting element and the base body each have at least one engagement element, wherein the engagement element of the cutting element is held by the restoring force in engagement with the complementary formed engagement element of the base body, so that the cutting element is fixed to the base body.

By the engagement between the engagement elements is ensured in the attached state that the cutting element is held on the base body, so that it can not be lost. By holding the cutting element on the engagement elements is achieved that can be dispensed with an elaborate screw, either by a self-attached to the cutting element thread or separate screws, and thus a particularly easy to manufacture and again easy to solve connection between the Cutting element and the main body is reached. In particular, therefore, the cutting element can be pressed in a simple manner from the hard metal, without the need for elaborate processing steps, such as milling, are necessary. Thus, a particularly simple and inexpensive production is possible.

In the second position, in particular, the pin projects into the receiving area by a second preset length which is less than the preset length by which the pin projects into the receiving area in the first position. When attaching the cutting element to the base body of this is used in particular in the axial direction in the receiving area and moved against the restoring force of the elastic element on the base further such that the now engaging in the recess of the cutting element pin is moved from the first to the second position , Subsequently, the cutting element is rotated radially until the engagement between the engagement elements is achieved. Unlike the prior art, no external thread is screwed into an internal thread in the radial rotation. In particular, in the radial rotation no movement of the cutting element in the axial direction, as is the case with threaded interconnected elements of the case.

The elastic element is designed in particular as a spring, so that a particularly simple cost-effective construction is achieved. Preferably, a coil spring is used, which is arranged such that it holds the pin in the first position.

If the pen is moved to the second position, d. H. moved deeper into the bore, so the coil spring is compressed so that the pin on the contact to the cutting element this presses away from the body in such a way that the two engagement elements are engaged with each other.

In a preferred embodiment, the through-hole is in the form of a stepped bore, wherein the pin is arranged in a first narrow region of the stepped bore and the elastic element in a second wide region of the stepped bore, which has a larger diameter than the first region, adjoining the narrow region are. At the end region of the pin facing away from the receiving area, a stop element is fixedly secured, which is arranged in the wide area and has a larger diameter than the narrow area. The elastic member contacts the abutment member and presses a contact portion of the abutment member against a stop formed by the transition from the wide to the narrow portion when the pin is located in the first position. About this contact between the stop element and the stop positioning of the pin is ensured in a simple manner in the first position, unless the pin is pressed into contact with the cutting element against the restoring force of the elastic element in the through hole. In the second position, there is thus no contact between the contact region of the stop element and the stop.

The recess of the cutting element is formed in particular frusto-conical, so that a secure positioning of the cutting element is ensured in the receiving area by the pin. In particular, a centering of the cutting element relative to the receiving area is achieved by this conical recess, d. H. a longitudinal axis of the cutting element coincides with the longitudinal axis of the base body. In a particularly preferred embodiment, at least a portion of the projecting into the receiving area end portion of the pin is frusto-conical, so that when the cutting element rests on the pin, the pin is received flush in the recess and thus a particularly secure attachment of the element to the Body is reached.

The pin may preferably have an axial through-hole, through which a cooling liquid can be carried out during drilling, so that cooling of the cutting element is achieved in a simple manner. The cutting element may also have one or more holes through which the supplied cooling liquid is transported further. Alternatively, the cooling liquid may also be passed between the cutting element and side walls of the Bohrwerkszeuges, where the cutting element in the fastened position, passed.

Furthermore, it is alternatively possible that the coolant is conveyed through between the pin and the wall of the through hole of the base body, so that the pin itself does not have to have a through hole. In this case, the through-bore of the base body in particular has a further third region, which is arranged between the first region of the through-hole and the receiving region and which has a larger diameter than the first region. The facing the receiving area In this case, the end region of the pin preferably has two frustoconical regions adjoining one another, this region adjoining one another with the base surfaces of the truncated cones, so that the diameter of the pin first increases in the direction of the receiving region and then decreases again. The increasing frustoconical region is at least partially disposed within the third region of the throughbore of the base body. The decreasing frusto-conical portion is at least partially disposed in the recess of the cutting element in the fastened state and preferably formed complementary to the recess. Thus, a secure attachment and accurate centering of the cutting element and a simple supply of the coolant can be achieved.

The engagement element of the cutting element is formed in particular in the form of a recess and the engagement element of the base body in the form of a projection. In the attached state, the projection and the recess engage in one another, so that the cutting element is fastened to the base body in a simple manner via this engagement. The recess and the projection are in particular each cylinder-segment-shaped, wherein the restoring force presses a base of the cylinder-segment-shaped recess against the base of the cylinder-segment-shaped projection. Under the base of a cylinder-segment-shaped element, the bottom or top surface of this cylinder-segment-shaped element is understood.

In a particularly preferred embodiment, both the cutting element and the base body each comprise at least two engagement elements, wherein in the attached state, in each case an engagement element of the cutting element with an engagement element of the body is engaged, so that a total of two interventions a particularly secure attachment of the cutting element to the Main body is achieved so that the cutting element does not accidentally disengage from the body. The engagement elements are in particular arranged such that the two are arranged symmetrically about the formed interventions to the longitudinal axis of the base body.

The main body itself is formed in particular axially symmetrical to its longitudinal axis. The cutting element is preferably also formed axially symmetrical to its longitudinal axis, so that in such a construction, a uniform distribution of the forces acting takes place.

The receiving region is delimited in particular by a bottom surface and at least two side walls of the main body, the bottom region at least partially delimiting the receiving region in the axial direction in the radial direction. The opening of the through hole of the base body is arranged in particular in the bottom surface. The engagement elements of the base body are arranged on the side walls and protrude into the receiving area. After the side element has been pressed into the receiving region in the axial direction against the restoring force of the elastic element, the rotation in the radial direction ensures that the engagement elements of the side element are arranged in the region between the engagement elements of the base body and the bottom surface of the base body. The restoring force pushes the cutting element and thus the engagement elements of the cutting element away from the bottom surface and thus against the engagement elements of the main body.

Thus, a secure attachment of the cutting element is achieved on the body in a simple manner. The compound formed in this way can be easily prepared manually without the aid of a tool and also released again. In particular, no great effort is required for this purpose.

The bottom surface has two converging legs in the direction of the longitudinal axis of the main body, which enclose an angle in the range between 90 ° and 195 ° to each other. The side of the cutting element opposite the cutting edge has, in particular, a shape that is complementary to the bottom surface, so that a secure attachment of the cutting element to the base body is achieved via the contact between the bottom surface and the cutting element during drilling and in particular prevents slippage of the cutting element in the radial direction becomes. In particular, a centering of the cutting element on the base body is ensured by the described shape of the contact areas. The bottom surface of the base body as well as the contact area of the cutting element formed complementary to it are in particular approximately V-shaped.

The engagement elements of the cutting element and the base body are in particular arranged such that in the attached state, the cutting element does not contact the bottom surface. Between the bottom surface and the surface of the cutting element opposite the cutting edge, a preset clearance is preferably formed in the attached state, so that the attachment of the cutting element to the base body is particularly easy. For releasing the cutting element, ie for bringing the cutting element from the fixed to the released state, the cutting element is in particular initially easy in axial direction against the restoring force of the spring element is pressed to the bottom surface, so that there is no engagement between the engagement elements. Subsequently, the cutting element is rotated radially, so that it can be removed in the axial direction of the main body, without the interference elements interfere with each other.

In a drilling state, due to the forces acting on the cutting element during drilling, the cutting element presses the pin even further into the through-hole, relative to the restoring force of the elastic element, relative to the second position, so that the pin is arranged in a third position. The drilling state is in particular that state in which a bore is bored with the aid of the drilling tool. In the drilling state, at least a partial region of the side of the cutting element opposite the cutting edge is preferably located on the bottom surface, so that the forces acting on the cutting element during cutting can be transmitted to the base body via this contact.

By moving the pen to the third position, d. H. in particular, the engagement element of the cutting element and the engagement element of the base body in the drilling state are not engaged with each other by the moving of the pin at the transition from the fastened state to the drilling state, wherein the cutting element in the drilling state only on the drilling acting forces is held in the receiving area. If drilling stops, d. H. at the transition from the drilling state to the fastened state, the cutting element is moved by the restoring force of the elastic element back into the second position so that it is held on the engagement between the engagement elements on the base body and thus even if no longer with the drilling tool is bored, can not be lost from the main body.

In this embodiment of the drilling tool, the attachment of the cutting element to the base body in the attached state only serves to ensure that the cutting element is held by the drilling tool on the base body, but not to absorb the forces acting during drilling. When drilling the cutting element is held by the forces acting during drilling forces on the body, so that when drilling no attachment of the cutting element to the body via connecting elements, such as engagement elements, is necessary. Thus, provided for holding the cutting element on the base body in the fastened state connection via the engagement elements can be very simple, so that the connection can be easily made and also released again.

The cutting element presses in the drilling state in particular against the side walls of the base body, so that the forces acting in the radial direction are absorbed by the base body.

Further, it is advantageous if the bottom surface has at least one elevation at its radial edge, and if the cutting element has at least one recess formed complementary to the elevation. In the attached state and also in the drilling state, the elevation is at least partially disposed in the recess, so that slipping of the cutting element in the radial direction relative to the base body is avoided. In a particularly preferred embodiment, two elevations are provided, wherein the cutting element has correspondingly complementary thereto two recesses. The survey is arranged in particular on the through hole remote from the ends of the bottom surface.

The cutting element is preferably made of a hard metal, a high-speed steel, a ceramic, cubic boron nitride or a polycrystalline diamond so that it has a strength. The main body may also be made of a hard metal or a high-speed steel, but alternatively also made of a less expensive, less hard tool steel. The simply formed shape of the cutting element makes it possible to produce this via a pressing process, so that elaborate processing methods, such as milling and grinding, can be dispensed with or at least only a few such processing steps, for example for forming the cutting edge, are necessary.

The drilling tool is designed in particular in the form of a spiral drill, for which purpose preferably the base body has corresponding spiral-shaped recesses.

The end region of the base body opposite the receiving region is in particular designed such that it can be clamped in a drilling machine with the aid of which the drilling tool can be displaced into a rotation necessary for the bore. For this purpose, the shaft of the basic body is preferably designed to be complementary to a receptacle of the respective drills for which the drilling tool is intended, so that additional connecting pieces can be dispensed with in this opposite end region. Thus concentricity errors are prevented.

Further features and advantages of the invention will become apparent from the following description which the invention with reference to embodiments in conjunction with the accompanying figures explained in more detail.

Show it:

1 a schematic sectional view of a drilling tool;

2 a side view of a cutting element of the drilling tool according to 1 ;

3 a top view of the cutting element after 2 ;

4 a plan view of a base body of the drilling tool according to 1 ;

5 a sectional view of the body after 4 along the section BB to 4 ;

6 a sectional view of the drilling tool according to 1 along the section AA after 4 ;

7 a schematic representation of a pin and a stop element of the body after 1 ;

8th a schematic representation of an Allen screw of the main body of the drilling tool according to 1 , and

9 a schematic perspective view of the drilling tool according to 1 ,

In 1 is a schematic sectional view of a drilling tool 10 that is a basic body 12 and a cutting element 14 which is also referred to as a turning plate, cutting head or cutting tip. The cutting element 14 is about a, described in more detail below, detachable connection with the body 12 connectable and again removable from this, so that the cutting element 14 can be easily replaced. Thus, in case of wear of the cutting element 14 only this will be replaced, with the main body 12 can be used further, so that the cost of materials and thus the costs are reduced.

The main body 12 has a through hole designed as a stepped bore 16 on, in which also a through hole 18 having a pen 20 , a stop element 24 , as a spring 26 formed elastic element and an Allen screw 28 are included. The pencil 20 and the stopper element 24 are in 7 shown closer and firmly connected. The stop element 24 is here at a first end portion of the pin 20 arranged, wherein the first end region opposite the second end portion of the pin 20 into a recording area 22 for receiving the cutting element 14 protrudes. The feather 26 and the stopper element 24 are in a wide range of through-hole 16 arranged, whereas the pin 20 in a narrow area of the through hole 16 is arranged. The transition from the wide to the narrow area is a stop 30 trained, against which the spring 26 the stop element 24 in a dissolved state, not shown. The released state is the state in which the cutting element 14 from the main body 12 is removed. In the released state is the pen 20 arranged at a first position in which it by a preset first length in the receiving area 22 protrudes. Will the cutting element 14 in the recording area 22 taken and attached to the main body 12 attached, it is in the direction of arrow P1 in the axial direction on the body 12 to be moved, it being the pen 20 also in the direction of arrow P1 deeper into the through hole 16 against the spring force 26 shifts in. Thus, the pen 20 in the 1 shown fastened state in a second position, in which it by a second length from the through hole 16 out into the reception area 22 protrudes, this second length is less than the first length. The feather 26 is compressed in this case, so that the stop element 24 no longer in contact with the attack 30 is.

The Allen screw 28 , in the 8th is shown isolated, has an external thread 32 on, about that the Allen screw 28 in one in the through hole 16 provided internal thread 34 can be screwed in, so that over the allen screw 28 the feather 26 can be biased so that it is the stop element 24 in the released state against the stop 30 pushes and thus the pen 20 holds in the first position.

The Allen screw 28 also has a through hole 36 on, so through the through hole 36 the Allen screw and the through hole 18 the pin a coolant for cooling the cutting element 14 can be transported through. The cutting element 14 may also have one or more holes through which the coolant continues to the cutting surface 42 of the cutting element 14 can be transported. Alternatively, the cutting element 14 also have no holes, in which case the coolant on the outer wall of the cutting element 14 in the direction of the cutting surface 42 is guided along.

The feather 26 is designed in particular as a helical spring, so that a particular simple and inexpensive construction is achieved. Furthermore, this coil spring makes it possible 26 in that the cooling liquid can be easily transported through it.

In 1 is the lateral surface of the main body 12 shown schematically as a smooth surface for easy representation. The drilling tool 10 but is preferably as a twist drill, as in 9 shown, formed, in which case the lateral surface of the body 12 has spiral-shaped recesses as chip spaces. Alternatively, the main body 12 also have other Spanraumausführungen.

In 2 is a side view of the cutting element 14 and in 3 a top view of the cutting element 14 shown. The cutting element 14 has a frusto-conical recess 40 on top of the cutting surface 42 opposite side 70 of the cutting element 14 is arranged. At the cutting surface 42 is at least one cutting edge 44 intended. Alternatively, you can also cut two or more than two 44 on the cutting surface 42 be arranged.

The frustoconical recess 40 is coaxial with a longitudinal axis 46 of the cutting element 14 arranged, wherein the cutting element 14 preferably axisymmetric to this longitudinal axis 46 is trained.

Furthermore, the cutting element 14 two opposing radial recesses 48 . 50 on, with an inner boundary surface 52 . 54 the recess 48 . 50 is formed circular sector. In addition, the cutting element has 14 two as recesses 56 . 58 trained engagement elements on two side surfaces 60 . 62 of the cutting element 14 are arranged. The recesses 56 . 58 are in particular cylinder segment-shaped, wherein by the base surfaces 64 . 66 of the cylinder segment in each case a paragraph is formed, which, as described in more detail later, for attachment of the cutting element 14 with complementary projections of the body 12 engaged.

In 4 is a plan view of the body 12 to 1 shown. 5 shows a sectional view of the body 12 along the section BB to 4 , Neither in 4 still in 5 is the cutting element 14 in the recording area 22 recorded and thus not shown.

The recording area 22 is in the axial direction through a bottom surface 80 and in the radial direction through two side walls 82 . 84 and two radial elevations 86 . 88 limited. The side walls 82 . 84 are here designed higher than the radial recesses 86 . 88 , In between the side walls 82 . 84 and the recording areas 22 arranged intermediate areas 90 . 92 the dimension of the body in the axial direction is less than in the region of the receiving area 22 so that the recording area 22 , in particular also its floor area 80 over these intermediate areas 90 . 92 protrudes, so that at the height of the receiving area 22 between the side walls 82 . 84 a free space is formed, so that, the cutting element 14 as described in more detail below, in a simple manner by a radial rotation of the base body 12 is fastened.

The recording area 22 is particularly complementary to the cutting element 14 designed so that this most accurately in the receiving area 22 can be included. The floor area 80 includes two beveled legs 94 . 96 where the two legs 94 . 96 each a preset angle α to the longitudinal axis 98 of the basic body 12 which has a value in the range between 70 ° and 88 °, preferably between 80 ° and 85 °.

The cutting surface 42 opposite ground surface 70 of the cutting element 14 is particularly complementary to the floor surface 80 of the basic body 12 formed, and accordingly also has two bevelled legs 72 . 74 up to the longitudinal axis 46 preferably have the same angle α.

The two side walls 82 . 84 of the basic body 12 each have a recess 100 on, in each case a pen 102 . 104 is arranged. The pencils 102 . 104 protrude at least partially into the receiving area 22 into it, so by their base area 106 one projection each 108 is formed in the receiving area 22 protrudes and with the base areas 64 . 66 the recesses 56 . 58 for fastening the cutting element 14 on the body 12 can be brought into engagement.

In an alternative embodiment, the projections 108 also directly to the side walls 82 . 84 be molded, so no separate pins 102 . 104 must be provided. It is alternatively also possible that the engagement between the body 12 and the cutting element 14 for fixing the cutting element 14 on the body 12 is formed by the fact that the cutting element 14 Protrusions and the body 12 Complementarily designed for this purpose has recesses. In addition, it is alternatively also possible that the cutting element 14 only one engagement element 56 . 58 and accordingly also the basic body 12 just a head start 108 having. Furthermore, the cutting element 14 also more than two engagement elements 56 . 58 , for example four engaging members 56 . 58 , in which case the main body 12 a corresponding number of complementarily formed engagement elements 108 having.

As already described, the cutting element is in a released state 14 not at the base 12 attached and thus not in the recording area 22 added. In the released state, the pin protrudes 20 at the preset first length in the recording area 22 into and is thus arranged in a first position. For attaching the cutting element 14 on the body 12 the cutting element is so in the axial direction in the direction of arrow P1 on the body 12 moved to at least partially within the intermediate areas 90 . 92 is arranged and not completely in the receiving area 22 is included. The cutting element 14 is moved so far in the direction of the arrow P1, until its bottom surface 70 the floor area 80 of the basic body 12 at least partially contacted. This will make the pen 20 against the spring force of the spring 26 deeper into the through hole 16 pressed until it only a preset third length, which is less than the first and the second length, in the receiving area 22 protrudes. That in the reception area 22 protruding end of the pin 20 is here in the frusto-conical recess 40 taken, wherein by the frustoconical design of the recess 40 a centering of the cutting element 14 reached and tilting the cutting element 14 is prevented. This is the second end of the pen 20 preferably also frusto-conical, in particular complementary to the frusto-conical recess 40 educated.

Subsequently, the cutting element 14 turned in the direction of the arrow P2 until its the cutouts 56 . 58 having side surfaces 60 . 62 on the side walls 82 . 84 issue. Here, a pure radial rotational movement, without the cutting element 14 , For example, as in a thread, also in the axial direction P1 is moved.

When the cutting element 14 on the side walls 82 . 84 is present, is between the bases 64 . 66 the recesses 56 . 58 of the cutting element 14 and the projections 108 the pencil 102 . 104 a preset distance so that they are not engaged with each other. Will now be the cutting element 14 let go, so move the spring 26 due to their spring force the cutting element 14 opposite to the direction of the arrow P1 from the bottom surface 80 of the basic body 12 away, until the bases 64 . 66 with the projections 108 are engaged and thus the cutting element 14 on the body 12 is held. This is the pen 20 through the spring 26 moved from the third to the second position, in which he is about the second length from the through hole 16 protrudes. Thus, the in 1 shown attached state in which the cutting element 14 about the engagement between the recesses 56 . 58 and the pins 102 . 104 easily and safely in the receiving area 22 is held. The fastening according to the method described above can thus be done easily without the aid of a tool.

In this fastened state is between the bottom surface 70 of the cutting element 14 and the floor area 80 of the basic body 12 a pre-set game 110 formed so that the two bottom surfaces 70 . 80 do not contact in the attached state. In the attached state, the pin engages 20 in the frusto-conical recess 40 and the two radial elevations 86 . 88 grab in the radial recesses 48 . 50 a, so that about these interventions a centering of the cutting element 14 is achieved relative to the base body and slipping and / or tilting of the cutting element 14 relative to the main body 12 is avoided.

6 shows a sectional view along the section AA after 4 , The pencil 102 is arranged such that its longitudinal axis 112 by a preset angle δ relative to the longitudinal axis 98 of the basic body 12 is tilted. In addition, its base area 106 relative to an orthogonal 114 to the longitudinal axis 98 beveled by a preset angle β, so that the projection 108 from the side wall 82 out in the direction of the receiving area 22 seen in the direction of the floor area 80 is inclined. The base area 64 the recess 56 is correspondingly chamfered to this, so that in the in 6 shown attached state on the engagement between the base 64 and the lead 108 a secure attachment of the cutting element 14 at the base body 12 is reached. In particular, this beveled formation of the projection 108 and the base area 64 achieved that the cutting element 14 can not turn independently against the direction of the arrow P2, without it in the direction of the arrow P1 against the spring force of the spring 86 is moved. This is a particularly secure attachment to the body 12 guaranteed.

In particular, the angle δ has a value between 1 ° and 5 °, preferably 2 °. The angle β has in particular a value between 1 ° and 10 °, preferably of 5 °. In a particularly preferred embodiment, the angles β and δ are equal.

In an alternative embodiment of the invention, only the pin can be used 102 relative to longitudinal axis 98 be arranged tilted or only the base 106 beveled. Furthermore, alternatively, the projection 108 or the complementary base 64 not oblique but orthogonal to the side wall 84 be arranged.

To release the cutting element 14 from the main body 12 this is at least as far moved in the axial direction in the direction of the arrow P1 that no engagement between the projections 108 and the bases 64 . 66 consists. Subsequently, the cutting element 14 rotated against the direction of the arrow P2 and then against the direction of the arrow P1 from the receiving area 22 taken.

About the above-described attachment via the locking connection between the projections 108 and the bases 64 . 66 is achieved on the one hand, that this locking connection easily made and on the other hand but also can be solved easily. The cutting element 14 can be particularly easily formed, since no thread or the like must be provided for attachment. The cutting element 14 Thus, it is possible in particular to press it from a blank so that it can be cut, with only the boundary surfaces 52 . 54 and the cutting diameter of the cutting edge 44 be sanded. As a result, a particularly low-material, cost-effective construction is ensured.

When drilling is the drilling tool 10 in a drilling state where the cutting element 14 due to the forces acting during drilling so far against the spring force of the spring 26 moved in the direction of arrow P1 is that of its bottom surface 70 the floor area 80 of the basic body 12 contacted and supported on this. Further, by the cutting forces, the side surfaces 60 . 62 of the cutting element 14 against the side walls 82 . 84 pressed. Due to the beveled design of the two bottom surfaces 70 . 80 and those in the radial recesses 48 . 50 recorded radial elevations 86 . 88 Furthermore, slipping and / or tilting of the cutting element 12 avoided during drilling.

Thus, when drilling the interventions between the projections 108 and the base area 64 . 66 solved, because the cutting element 14 as well as in the loosening and fixing of the cutting element 14 , the floor area 80 contacted and the pin 20 is arranged in the third position. Due to the forces acting during drilling the cutting element 14 but still reliable over the contact to the floor area 80 , the side walls 82 . 84 and / or the surveys 86 . 88 in the recording area 22 held. Thus, the interventions between the projections need 108 and the base area 64 . 66 only for holding the cutting element 14 in the attached state, so if not drilled to be trained.

When finishing drilling, ie when no more cutting forces on the cutting element 14 act, the cutting element 14 by the spring force of the spring 26 again so far moved against the arrow P1 in the axial direction, that the engagement between the recesses 56 . 58 and the projections 108 is restored, so that the cutting element 14 again in the reception area 22 is held and can not be lost.

LIST OF REFERENCE NUMBERS

10

drilling

12

body

14

cutting element

16, 18

Through Hole

20

pen

22

reception area

24

stop element

26

feather

28

Allen screw

30

attack

32, 34

thread

36

Through Hole

40, 48, 50

recess

42

cutting surface

44

cutting edge

46

longitudinal axis

52, 54

boundary surface

56, 58

recess

60, 62

side surface

64, 66

Floor space

70, 80

floor area

72, 74, 94, 96

leg

82, 84

Side wall

86, 88

survey

90, 92

intermediate area

98

longitudinal axis

100

recess

102, 104

pen

106

Floor space

108

head Start

110

game

112

longitudinal axis

114

orthogonal

P1, P2

direction

α, β, δ

angle

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 0460237 A1 [0003]
• DE 19543233 A1 [0003]
• WO 2010/106117 A1 [0003]
• EP 0298061 A1 [0003]
• EP 0441302 A2 [0003]
• EP 0348371 A2 [0003]
• EP 1200222 B1 [0004]
• DE 10042990 A1 [0004]
• DE 19605157 A1 [0005]
• WO 2010/142411 A1 [0005]
• DE 10333340 A1 [0005]
• WO 00/25967 [0005]
• DE 19914170 C1 [0005]
• EP 0508468 A1 [0005]
• EP 0549548 A1 [0005]
• DE 4239257 A1 [0005]
• DE 3738000 A1 [0005]
• DE 4435857 A1 [0005]

Claims (22)

Drilling tool, with a basic body ( 12 ), and with a replaceable cutting element ( 14 ), the at least one cutting edge ( 44 ), wherein the basic body ( 12 ) an axial through-bore ( 16 ) and at one end a receiving area ( 22 ) for receiving the cutting element ( 14 ), in a fixed state, the cutting element ( 14 ) in the reception area ( 22 ) and on the base body ( 12 ), and wherein in a released state the cutting element ( 14 ) of the basic body ( 12 ), characterized in that in the through-bore ( 16 ) a pen ( 20 ), which in the released state is arranged in a first position in which it is moved by a preset length into the receiving area (FIG. 22 ) protrudes, in the through hole ( 16 ) an elastic element ( 26 ) is arranged, which the pin ( 20 ) holds in the first position, the cutting element ( 14 ) at the cutting edge ( 44 ) opposite side ( 70 ) a recess ( 40 ) into which the pin ( 40 ) in the fastened state, the pin ( 20 ) is arranged in the fastened state in a second position, in which it counter to a restoring force of the elastic element ( 26 ) relative to the first position further into the through hole ( 16 ), and that at least one engagement element ( 56 . 58 ) of the sheath element ( 14 ) by the restoring force for fastening the cutting element ( 14 ) in engagement with at least one complementary engagement element ( 102 . 104 ) of the basic body ( 12 ) is held. Drilling tool ( 10 ) according to claim 1, characterized in that the elastic element ( 26 ) is designed as a spring, in particular as a helical spring. Drilling tool ( 10 ) according to one of the preceding claims, characterized in that the through-bore ( 16 ) is designed as a stepped bore, that the pin ( 20 ) in a narrow area of the stepped bore ( 16 ) and the elastic element ( 26 ) in a wide region of the stepped bore adjoining the narrow region ( 16 ) are arranged, that at the receiving area ( 22 ) end portion of the pen ( 20 ) a stop element ( 24 ), which is arranged in the wide area and has a larger diameter than the narrow area, that the elastic element (FIG. 26 ) the stop element ( 24 ), and that the elastic element ( 26 ) a contact area of the stop element ( 24 ) against a stop formed by the transition from the wide area to the narrow area ( 30 ) presses when the pen ( 20 ) is arranged in the first position. Drilling tool ( 10 ) according to one of the preceding claims, characterized in that the recess ( 40 ) of the cutting element ( 14 ) is frusto-conical. Drilling tool ( 10 ) according to one of the preceding claims, characterized in that the pin ( 20 ) an axial through-bore ( 18 ) having. Drilling tool ( 10 ) according to one of the preceding claims, characterized in that the longitudinal axis ( 98 ) of the basic body ( 12 ) and the longitudinal axis of the through hole ( 16 ) of the basic body ( 12 ) coincide. Drilling tool ( 10 ) according to one of the preceding claims, characterized in that the engagement element ( 56 . 58 ) of the cutting element ( 14 ) in the form of a recess and the engagement element ( 102 . 104 ) of the basic body ( 12 ) in the form of a projection ( 108 ) are formed, and that in the attached state, the projection ( 108 ) and the recess ( 56 . 58 ) are engaged with each other. Drilling tool ( 10 ) according to claim 7, characterized in that the recess ( 56 . 58 ) and the lead ( 108 ) are each formed in the shape of a cylinder segment, and that the restoring force is a base area ( 64 . 66 ) of the cylinder segment-shaped recess ( 56 . 58 ) against a base area ( 106 ) of the cylinder segment-shaped projection ( 108 ) presses. Drilling tool ( 10 ) according to one of the preceding claims, characterized in that the cutting element ( 14 ) and the basic body ( 12 ) at least two engagement elements ( 56 . 58 . 102 . 104 ), which are engaged with each other in the attached state. Drilling tool ( 10 ) according to one of the preceding claims, characterized in that the basic body ( 12 ) and / or the cutting element ( 14 ) each axisymmetric to their respective longitudinal axis ( 46 . 98 ) are. Drilling tool ( 10 ) according to one of the preceding claims, characterized in that the receiving area ( 22 ) in the axial direction through a bottom surface ( 80 ) of the basic body ( 12 ) and in the radial direction at least partially by two side walls ( 82 . 84 ) of the basic body ( 12 ) is limited. Drilling tool ( 10 ) according to claim 11, characterized in that the engagement elements ( 102 . 104 ) of the basic body ( 12 ) on the side walls ( 82 . 84 ) and in the receiving area ( 22 protrude). Drilling tool ( 10 ) according to claim 11 or 12, characterized in that the bottom surface ( 80 ) two in the direction of the longitudinal axis ( 98 ) of the basic body ( 12 ) converging legs ( 94 . 96 ), which enclose an angle in the range between 90 ° and 175 ° to each other, and that of the cutting edge ( 44 ) opposite side ( 70 ) of the cutting element ( 14 ) one complementary to the bottom surface ( 80 ) of the basic body ( 12 ) has a trained form. Drilling tool ( 10 ) according to one of claims 11 to 13, characterized in that the engagement element ( 56 . 58 ) of the cutting element ( 14 ) and the engagement element ( 102 . 104 ) of the basic body ( 12 ) are arranged such that in the attached state, the bottom surface ( 80 ) of the basic body ( 12 ) the cutting element ( 14 ) not contacted. Drilling tool ( 10 ) according to claim 14, characterized in that between the bottom surface ( 80 ) of the basic body ( 12 ) and the cutting edge ( 44 ) opposite surface ( 70 ) of the cutting element ( 14 ) in the attached state a preset game ( 110 ) is provided. Drilling tool ( 10 ) according to claim 14 or 15, characterized in that in a drilling state the cutting element ( 14 ) the pencil ( 20 ) due to when drilling on the cutting element ( 14 ) forces further relative to the second position against the restoring force of the elastic element ( 26 ) into the perforation ( 16 ), so that the pen ( 20 ) is arranged in a third position. Drilling tool ( 10 ) according to claim 16, characterized in that in the drilling state, at least a portion of the the cutting edge ( 44 ) opposite side ( 70 ) of the cutting element ( 14 ) on the floor surface ( 80 ) of the basic body ( 12 ) rests. Drilling tool ( 10 ) according to claim 16 or 17, characterized in that in the drilling state the engagement element ( 56 . 58 ) of the cutting element ( 14 ) and the engagement element ( 102 . 104 ) of the basic body ( 12 ) are not in engagement with each other, and that the cutting element ( 14 ) in the drilling state only on the forces acting during drilling in the receiving area ( 22 ) is held. Drilling tool ( 10 ) according to one of claims 16 to 18, characterized in that the cutting element ( 14 ) in the drilling state against the side walls ( 82 . 84 ) of the basic body ( 12 ) is pressed. Drilling tool ( 10 ) according to one of claims 11 to 19, characterized in that the bottom surface ( 80 ) of the basic body ( 12 ) at its radial edge at least one elevation ( 86 . 88 ), preferably two opposite elevations ( 86 . 88 ), and that the cutting element ( 14 ) at least one complementary to the survey ( 86 . 88 ) formed recess ( 48 . 50 ), preferably at least two complementary to the two surveys ( 86 . 88 ) formed recesses ( 48 . 50 ), and that in the attached state the survey ( 86 . 88 ) or the surveys ( 86 . 88 ) at least partially in the recess ( 48 . 50 ) or the recesses ( 48 . 50 ) is arranged or are. Drilling tool ( 10 ) according to one of the preceding claims, characterized in that the cutting element ( 14 ) made of a hard metal, a high-speed steel, a ceramic, cubic boron nitride or a polycrystalline diamond, in particular pressed. Drilling tool ( 10 ) according to one of the preceding claims, characterized in that the drilling tool ( 10 ) has helical and / or straight chip spaces.

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