Workpiece Machining Assembly

Abstract

The invention relates to an apparatus for machining workpieces. The apparatus comprises a machining tool (1) with a cutting edge region (3), a shank (30) with a conical shank region (5) and a holding region (4) arranged adjacent to the conical shank region (5), a tool extension (2) with a conical receiving region (21), and a tool holding device (15) for receiving the tool extension (2). The conical shank region (5) and the conical receiving region (21) are designed complementary to each other such that the machining tool (1) is held in the tool extension (2) only by a press-fit connection between the conical shank region (5) and the conical receiving region (21). The tool holding device (15) is adapted to be connected to a rotatable spindle of a machine tool. The cutting edge region (3) has a maximum diameter D1 in a plane E perpendicular to the central axis X. The plane E intersects a bounding volume (12), which is an arithmetic extension of the external conical portion (8) of the tool extension (2), such that a maximum first distance A1 of the bounding volume (12) from the cutting edge region (3) is at most 10% of a diameter D1 of the cutting edge region (3), or the cutting edge region (3) is tangent to the bounding volume (12), or the bounding volume (12) intersects the cutting edge region (3) such that a maximum second distance A2 of the cutting edge region (3) in the plane E is not more than 30% of the diameter D1 of the cutting edge region (3). The external conical portion (8) has a first cone angle a of not more than 10°, and a distance A from a free end (31) of the cutting edge region (3) to the exposed end (6) of the tool extension (2) is smaller than 5 times the maximum diameter D1 of the cutting edge region (3).

Description

[Technical field]

[0001] The present invention relates to an apparatus for machining a workpiece using a machining tool and tool holding device for use with a metal cutting machine, such as a milling or drilling machine. [Background technology]

[0002] In milling, grinding and like machining operations, the machining tools are usually clamped in a tool holding device which is adapted at one end to clamp the machining tool with clamping means suitable for the clamping purpose.

[0003] Typically, the tool to be clamped is provided at its end with a cylindrical shank which is clamped in the tool holding device. This shank can be clamped using various clamping methods, among which the collet chuck is very common. In a collet chuck, an elastic collet is compressed by a nut, so that the shank of the tool is firmly clamped in the tool holding device. Another method of clamping the tool in the tool holding device is heat shrinking, in which a hole in the tool holding device is provided at the end to be clamped with the tool, which hole corresponds very precisely to the cylindrical shank of the tool. The hole in the tool holding device is widened by heating so that the shank of the tool can be inserted. When the tool holding device is then cooled again, the hole in the tool holding device also shrinks, clamping the shank of the tool. To release the tool, the tool holding device with the tool clamped therein is heated again until the tool can be removed. Here, it is particularly disadvantageous that heating must be applied, and also that the outer diameter of the tool holder is much larger than the diameter of the shank of the tool to be clamped, especially when collets are used. A large difference in diameter between the tool holder 103 and the shank of the machining tool 102, as shown in FIG. 10, is undesirable in many machining situations. As shown in FIG. 10, when a workpiece having relatively steep walls, narrow grooves, etc. has to be machined, a collision may occur between the tool holder 103 and the workpiece 101. The steep walls of the workpiece 101 can only be machined in their upper regions by the machining tool 102. Machining the lower region of the steep walls may result in a collision between the tool holder 103 and the workpiece 101 at position K.

[0004] Such collisions can be avoided by choosing a longer machining tool 102, so that the machining tool 102 protrudes further from the tool holding device 103. However, this has the disadvantages that on the one hand the machining tool 102 becomes more expensive and, in particular, the machining process becomes less stable and more susceptible to vibrations due to the longer length of the machining tool 102. This leads to increased inaccuracies and / or reduced surface quality.

[0005] Another problem with clamping machining tools with tool holding devices is that long machining tools have a higher risk of tool breakage, especially when high rotational speeds are applied. Furthermore, tool holding devices are usually made of steel. If the tool holding device is very long and thin, for example to hold a shorter machining tool to be clamped, there is a risk that at high rotational speeds the tool holding device will bend and eventually break, impacting with great force and penetrating machine housing parts in the working area, endangering workers in the vicinity of the machine tool.

[0006] It is therefore an object of the present invention to provide an apparatus for machining workpieces and a machine tool with a simple design and easy and cheap manufacturability, which on the one hand provides a secure clamping of the machining tools and on the other hand also allows machining of steep surfaces of difficult-to-machine workpieces such as wall areas, grooves, deep holes, etc. Furthermore, the apparatus according to the present invention improves safety in the environment of the machine tool.

[0007] This object is achieved by providing an apparatus having the features of claim 1 and a machine tool having the features of claim 15. The dependent claims indicate further preferred embodiments of the invention.

[0008] In contrast, the device for machining workpieces according to the invention, having the features of claim 1, has the advantage of resolving the above-mentioned drawbacks. In particular, the machining tool can be reliably fixed on the tool-holding device, e.g. a collet chuck holder. This avoids the aforementioned protruding length of the tool-holding device, which is a danger for the operator. At the same time, it becomes possible to work with short and therefore cost-effective machining tools, so that the machining tool does not protrude unnecessarily from the tool-holding device in the axial direction of the machining tool. Nevertheless, the device can be made very narrow and narrow, so that the machining of deep grooves, deep holes, etc. is also possible safely and problem-free. This is achieved according to the invention in that the device for machining workpieces comprises a machining tool with a cutting edge region and a shank. The shank comprises a conical shank region and a holding region, in which the machining tool is gripped, which is arranged between the cutting edge region and the conical shank region. The machining tool can thus be gripped in this holding part. The holding region is preferably cylindrical, but may also be, for example, groove-shaped, etc. The device further comprises a tool extension with a receiving opening for receiving the machining tool. The receiving opening has a conical receiving area for the conical shank area of ​​the processing tool, the conical shank area and the conical receiving area being designed complementary to each other with the same cone angle, so that the processing tool is held in the tool extension only by a press-fit connection between the conical shank area and the conical receiving area, so that with the device according to the invention, it is not necessary to carry out shrinking operations or the like to hold the processing tool in the tool extension.

[0009] The device for machining a workpiece further comprises a tool holding device for receiving the tool extension, the tool holding device being adapted for connection to a rotating spindle of a machine tool or the like. The cutting edge region of the machining tool has a maximum diameter D1 in a plane E perpendicular to the central axis of the machining tool. In this case, the plane E intersects a bounding volume, which is a mathematical extension of the external cone of the tool extension, such that the maximum first distance A1 of the bounding volume from the cutting edge region is at most 10% of the diameter D1 of the cutting edge region. Alternatively, the bounding volume is tangent to the cutting edge region. The cutting edge region is thus preferably a sphere or a partial sphere, in which case the bounding volume, which is a truncated cone, is tangent to the cutting edge region. Furthermore, alternatively, the bounding volume penetrates the cutting edge region. In this case, the bounding volume penetrates the cutting edge region in the plane E such that the maximum second distance A2 of the cutting edge region to the bounding volume in the plane E is not more than 30% of the maximum diameter D1 of the cutting edge region.

[0010] Preferably, the bounding volume passes through the cutting edge region such that the maximum second distance A2 in the plane E to the bounding volume of the cutting edge region is not more than 20%, in particular not more than 10%, of the maximum diameter D1 of the cutting edge region.

[0011] Furthermore, the outer cone of the tool extension has a first cone angle a less than or equal to 10°, preferably less than 8°, and more preferably less than 5°. Furthermore, even in the assembled state, the distance A from the free end of the cutting edge region to the exposed end of the tool extension is less than 5 times the maximum diameter D1 of the cutting edge region, preferably less than 3 times, and more preferably less than 2 times the diameter D1.

[0012] Thus, according to the invention, short machining tools can be clamped reliably, making it possible to reach for machining surfaces of the workpiece which are difficult to machine.

[0013] Thus, by combining its features, the invention enables a machining tool to be simply and safely clamped to a tool extension which in turn can be simply and safely clamped to a tool holding device.

[0014] More preferably, the end of the tool extension opposite the conical receiving area is cylindrical so that this end can be clamped in an established manner within a tool holding device, such as, for example, a collet holder or a shrink fit holder.

[0015] Preferably, the conical shank region is designed as an outer cone with a second cone angle b and the conical receiving region is designed as an inner cone with a third cone angle c. This allows a simple, inexpensive and robust device design. Preferably, the outer diameter D2 of the exposed end of the tool extension is at most 20% larger, in particular at most 10% larger, than the diameter D1 of the cutting edge region.

[0016] Alternatively, the conical shank region is formed as an inner cone with a second cone angle b and the conical receiving region is formed as an outer cone with a third cone angle c. Thus, a conical cone is formed in the receiving region and a conical socket is formed in the processing tool. Preferably, the outer diameter D4 of the exposed end of the processing tool is at most 20% larger than the diameter D1 of the cutting edge region.

[0017] Preferably, the wall thickness of the part with the internal cone, ie the tool extension or machining tool, is in the range of 0.2 mm to 1.0 mm, in particular 0.3 mm to 0.8 mm, at the exposed end.

[0018] Preferably, only the tool extension is made of a hard metal material, or more preferably, the machining tool and the tool extension are each made of a hard metal material, preferably the same hard metal material.

[0019] The use of hard metal materials for the machining tools and tool extensions ensures that in the event of breakage of the machining tools or tool extensions, the machining tools or tool extensions will not bend at all or will only bend minimally at most. In the event of tool breakage, the forces acting on the broken part of the machining tool or tool extension are therefore significantly lower compared to long tool holding devices or tool extensions made of steel. This minimises the risk of penetration into housing parts of the machine tool or the like. This significantly reduces the risk of injury to workers in the immediate vicinity of the machine tool. Another preferred feature is that the tool holding device is also made of a hard metal material. It is particularly preferred that the machining tools, tool extensions and tool holding devices are made of a hard metal material.

[0020] Preferably, the first cone angle a is greater than or equal to the second cone angle b of the conical stem region and the third cone angle c of the conical receiving region.

[0021] Preferably, the second cone angle b of the conical stalk region and the third cone angle c of the conical receiving region are in the range of 1.5° to 4°, preferably 2° to 3°.

[0022] According to another preferred embodiment of the invention, the conical shank region is provided with a clamping region having a length L which is 1.5 times greater than the diameter D1 of the cutting edge region, thereby allowing a secure holding of the machining tool on the tool extension.

[0023] Preferably, the machining tool also comprises a circumferential collar which is arranged between the conical shank region and the holding region and protrudes radially outwards. On the one hand, the collar serves to close the conical shank region, and on the other hand, the collar prevents a gripping tool from reaching and damaging the conical shank region, for example when the machining tool is gripped in the holding region. In this way, the collar ensures a secure gripping of the machining tool on the tool extension.

[0024] Furthermore, it is preferred that the axial press-in path ranging from complete contact between the conical shank region and the conical receiving region to a pressure spring connection between the conical shank region and the conical receiving region is not more than 8%, in particular not more than 6%, of the maximum diameter D1 of the cutting edge region.

[0025] More preferably, the device comprises a control unit configured to move a gripper, which grips the processing tool at the holding area, in a path-controlled manner according to a press-fit path between the conical stalk area and the conical receiving area in order to form a pressure-fit connection between the conical stalk area and the conical receiving area, whereby the control unit predetermines the dimensions of the press-fit path between the conical stalk area and the conical receiving area in order to form a pressure-fit connection between the conical stalk area and the conical receiving area.

[0026] The path of the machining tool when it is pressed into the tool extension in the path-controlled manner is preferably selected depending on the maximum diameter of the conical receiving area and / or the cone angle of the conical receiving area.

[0027] More preferably, the control unit is configured to move the gripper, which grips the processing tool in the holding area, in a force-controlled manner depending on the press-in force between the conical stalk area and the conical receiving area in order to form a pressure spring connection between the conical stalk area and the conical receiving area, so that the control unit sets the press-in force used to form the pressure-fit connection between the conical stalk area and the conical receiving area.

[0028] Preferably, the maximum press-in force when press-fitting the machining tool onto the tool extension is selected as a function of the maximum diameter of the conical receiving area and / or the cone angle of the conical receiving area.

[0029] Preferably, when the press-fit is performed by the force fit method, the press-fit is path-controlled and force-controlled, for example by monitoring the press-in force during the path-controlled press-fit and pausing the path-controlled press-fit when a maximum press-in force is exceeded.

[0030] It is preferred that the apparatus further comprises a plunger, the tool extension and the tool holding device each having a through hole, the plunger being insertable through the through hole to release the press fit connection between the machining tool and the tool extension and remove the machining tool.

[0031] Furthermore, the invention relates to a machine tool, in particular a milling, grinding or drilling machine, comprising a device for machining a workpiece according to the invention, which preferably comprises a separate device, for example a robot, for automatic exchange of a machining tool into the tool extension, which is preferably force-fitted into the tool extension under path- and / or force-control by means of a control unit.

[0032] More preferably, the machine tool is a high-speed machine tool having a speed in the range of 10,000 rpm to 100,000 rpm.

[0033] The invention therefore makes it possible to solve a problem that has existed for a long time in the prior art in a surprisingly simple manner by providing a conical press-fit connection between the machining tool and the tool extension. The machining tool and the tool extension are preferably made of hard metal, preferably made of the same hard metal. The invention is particularly advantageous when using small machining tools with a small maximum diameter D1 in the cutting edge area, preferably D1 less than 3 mm, and a short axial length, preferably at most 5 times shorter than D1. The device according to the invention is preferably used in machine tools for finishing operations, in which only small forces are generated. [Brief description of the drawings]

[0034] Preferred exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings, in which: [Figure 1] 1 is a schematic cross-sectional view of an apparatus for machining a workpiece according to a first exemplary embodiment of the present invention, showing a machining tool press fit within a tool extension; [Diagram 2] FIG. 2 is a schematic side view of the processing tool of FIG. [Diagram 3] FIG. 2 is a partial schematic cross-sectional view of the tool extension part of FIG. 1. [Figure 4] FIG. 2 is a schematic enlarged view of FIG. [Diagram 5] FIG. 2 is a schematic cross-sectional view of an apparatus for machining a workpiece according to a second exemplary embodiment, showing a machining tool press fit within a tool extension; [Figure 6]FIG. 13 is a schematic cross-sectional view of an apparatus for machining a workpiece according to a third exemplary embodiment, showing a machining tool press fit within a tool extension; [Figure 7] FIG. 13 is a schematic cross-sectional view of an apparatus for machining a workpiece according to a fourth exemplary embodiment of the present invention, showing a machining tool press fit within a tool extension; [Figure 8] FIG. 8 is a schematic partial cross-sectional view of the processing tool of FIG. [Figure 9] FIG. 8 is a schematic cross-sectional view of the tool extension of FIG. [Figure 10] 1 is a schematic diagram of a conventional workpiece machining apparatus; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0035] An apparatus 100 for machining a workpiece according to a preferred exemplary embodiment of the present invention will now be described in detail with reference to FIGS.

[0036] As can be seen from figure 1, the device 100 for machining a workpiece comprises a machining tool 1, a tool extension 2 and a tool holding device 15. Figure 1 shows the machining tool 1 mounted on the tool extension 2.

[0037] 2 shows the machining tool 1 in detail. The machining tool 1 comprises a cutting edge region 3 and a shank 30. The shank 30 comprises a conical shank region 5 and a holding region 4 arranged between the cutting edge region 3 and the shank region 5. The holding region 4 serves as an area where the machining tool 1 is gripped, for example by a gripper 14, when the machining tool 1 is inserted into or removed from the tool extension 2.

[0038] In this exemplary embodiment, the holding region 4 is cylindrical. Furthermore, a collar 11 is disposed between the holding region 4 and the conical shank region 5, and this collar protrudes radially outward from the side surface of the shank 30. The collar 11 is formed around the entire circumference.

[0039] The tool extension 2 has an outer conical portion 8 with a first cone angle a and a cylindrical portion 9 adjacent the outer conical portion 8 .

[0040] The conical stem region 5 has a second cone angle b. In the present exemplary embodiment, the second cone angle b is 2°.

[0041] In the present exemplary embodiment, the cutting edge region 3 of the machining tool 1 is spherical with a center M and a maximum diameter D1 in a plane E perpendicular to the central axis of the machining tool 1. In this case, the machining tool 1 is made of a hard metallic material.

[0042] 3 shows a detail of a portion of the tool extension 2. The tool extension 2 has a receiving opening 20, which in this exemplary embodiment is continuous through the tool extension. The receiving opening 20 comprises a cylindrical bore 10 and a conical receiving area 21. A shoulder 22 is provided between the conical receiving area 21 and the bore 10.

[0043] The conical receiving area 21 has a third cone angle c, which is also 2°. Thus, the conical stem area 5 and the conical receiving area 21 have the same cone angle b and the same cone angle c, and are complementary to each other.

[0044] The tool extension 2 further comprises an outer cone 8 having a first cone angle a, which is larger than the second cone angle b and the third cone angle c, and which is 3° in the present exemplary embodiment.

[0045] In this regard, the tool extension 2 has an outer diameter D2 and an inner diameter D3 at the exposed end 6 of the tool extension 2. It is preferred that the outer diameter D2 is at most 40%, preferably at most 30%, larger than the inner diameter D3. Likewise, it is further preferred that the outer diameter D2 is at most 20%, preferably at most 10% larger than the maximum diameter D1 of the cutting edge region 3.

[0046] As can be seen from Figures 1 and 4, the machining tool 1 is held in the tool extension 2 only by a press-fit connection between the conical shank region 5 and the conical receiving region 21. This results in a clamping region 5' with an axial length L between the two conical surfaces (see Figure 4). The clamping region 5' is slightly shorter than the entire conical shank region 5, so that a small part of the conical shank region 5 protrudes from the tool extension 2 (see Figure 1).

[0047] As can be seen in detail in FIG. 4, the maximum diameter D1 of the cutting edge region 3 is selected such that a bounding volume 12, which is the arithmetic extension of the external cone 8 of the tool extension 2, is tangential to the maximum diameter D1 on the plane E.

[0048] The bounding volume 12 therefore mathematically forms, depending on the first cone angle a of the external cone 8 of the tool extension 2, a truncated cone on which the cutting edge region 3 abuts tangentially with a maximum diameter D1 on the plane E. Furthermore, the distance A from the free end 31 of the cutting edge region 3 to the exposed end 6 of the tool extension 2 in the state in which the machining tool 1 is assembled in the tool extension 2 is less than five times the maximum diameter D1 of the cutting edge region 3. In the present exemplary embodiment, the distance A is twice the maximum diameter D1 (A=2×D1).

[0049] The tool extension 2 is also made of a hard metal material. Here, the same hard metal as the processing tool 1 may be used, or another hard metal may be used. It is particularly important that the tool extension 2 is made of hard metal, since it is longer than the short processing tool 1. The processing tool 1 may also be made of steel.

[0050] This in particular prevents deformation of the machining tool 1 and / or displacement of the tool extension 2 from the central axis X during operation, in particular at high rotational speeds.

[0051] Thus, although breakage of the machining tool 1 cannot be avoided 100% during the operation of the machine tool, the risk of breakage is significantly lower compared to the prior art using steel tool extensions or very long steel tool holding devices. If steel material is used for the machining tool 1 and / or the tool extension 2, these parts may bend at very high rotational speeds, and if the tool breaks, the broken tool part will have an additional momentum depending on the degree of bending (lever arm). As a result, the broken steel tool part may act like a bullet and penetrate protective means such as hoods or disks of the machine tool etc.

[0052] The insertion of the machining tool 1 into the receiving opening 20 of the tool extension 2 can be carried out in various ways to form a force-fit connection between the machining tool 1 and the tool extension 2. A control unit 13 is preferably provided which is configured to move the gripper 14, which grips the machining tool 1 at the holding area 4, in a path-controlled manner according to a press-fit path between the conical shank area 5 and the conical receiving area 21 so as to form a pressure spring connection. Thus, the control unit 13 determines the length of the press-fit path by which the machining tool 1 is moved into the tool extension 2 in order to establish the force-fit connection.

[0053] Alternatively or additionally, the control unit 13 may be adapted to move the gripper 14 in a force-controlled manner as a function of the press-in force between the conical shank region 5 and the conical receiving region 21 so as to form a pressure spring connection. By presetting the press-in force, a secure holding of the machining tool 1 on the tool extension 2 is ensured. Here, the control unit may predefine the combination, i.e. the value of the press-in path and the value of the press-in force, and may also specify respective ranges with lower and upper threshold values.

[0054] As can be seen from Figures 1 and 3, the tool extension 2 has a relatively thin wall thickness at its exposed end 6, in the range of 0.2 mm to 1.0 mm. Thus, by providing a very thin tool extension 2, deep grooves, deep holes or long wall areas can be machined in the direction of the central axis X of the machining tool 1. This allows the use of a relatively short machining tool 1, so that the risk of tool breakage is greatly minimized compared to longer tools.

[0055] As shown in FIG. 1, the tool holding device 15 may be attached to the spindle (not shown in FIG. 1) using any conventional clamping method.

[0056] 5 shows an apparatus 100 according to a second exemplary embodiment of the present invention. Identical or functionally identical parts are indicated with the same reference numbers as in the first exemplary embodiment.

[0057] As can be seen from Fig. 5, in the second exemplary embodiment, with respect to the first exemplary embodiment, the dimension between the bounding volume 12 and the maximum diameter D1 of the cutting edge region 3 is different. As shown in Fig. 5, the maximum diameter D1 of the cutting edge region 3 in the plane E is smaller than the diameter of the conical bounding volume 12 in the plane E. In this case, a first distance A1 is provided on both sides of the cutting edge region 3 in the plane E. The first distance A1 is at most 10% of the diameter D1 of the cutting edge region. Otherwise, this exemplary embodiment corresponds to the first exemplary embodiment and provides similar advantages as the first exemplary embodiment, so please refer to the description of the first exemplary embodiment.

[0058] 6 shows an apparatus 100 for machining a workpiece according to a third exemplary embodiment of the present invention. Identical or functionally identical parts are designated with the same reference numerals as in the previous exemplary embodiments.

[0059] As can be seen from Fig. 6, in the third exemplary embodiment, the bounding volume 12 is formed such that it intersects with the cutting edge region 3. This results in a second distance A2 between the conical bounding volume 12 and the maximum diameter D1 of the cutting edge region 3 in the plane E. The second distance A2 is the distance from both sides of the bounding volume to the armoured area of ​​the cutting edge region 3. The second distance A2 is at most 30% of the maximum diameter D1 of the cutting edge region 3. Otherwise, this exemplary embodiment corresponds to the previous exemplary embodiment and provides similar advantages, so please refer to the description of the previous exemplary embodiment.

[0060] 7 to 9 show an apparatus 100 for machining a workpiece according to a fourth exemplary embodiment of the present invention. Identical or functionally identical parts are designated with the same reference numerals as in the previous exemplary embodiments.

[0061] The fourth exemplary embodiment is substantially the same as the first exemplary embodiment, but with the arrangement of the conical parts and the conical sockets swapped between the machining tool 1 and the tool extension 2. That is, here the machining tool 1 has an inner conical part with a second cone angle b as the conical receiving area 105 as the conical shank area, and the tool extension 2 has an outer conical part with a third cone angle c as the conical area 121 (see Figs. 8 and 9). Here too the second cone angle b and the third cone angle c are formed identically, so that only a press-fit connection is formed between the conical receiving area 105 of the machining tool 1 and the conical area 121 of the tool extension 2. The outer diameter D4 of the exposed end of the machining tool 1 is 10% larger than the diameter D1 of the cutting edge area 3.

[0062] In particular, this device has the advantage that the conical receiving area 105 allows the exposed end 106 of the tool extension 2 to be inserted deeper into the machining tool 1, thereby making it possible to further shorten the machining tool 1. In other respects, this embodiment of the exemplary embodiment corresponds to the preceding embodiment of the exemplary embodiment, so reference is made to the description given therein.

[0063] It should be noted that for all exemplary embodiments, the invention is illustrated with a partially spherical machining tool 1 having a partially spherical cutting edge region 3. However, the cutting edge region 3 may also be cylindrical, toric or even conical, in particular tapering towards the free end 31 of the cutting edge region 3. Other tool geometries may also be used with the invention, thereby obtaining similar advantages as the machining tool 1 described in the above exemplary embodiments.

[0064] The apparatus for machining a workpiece according to the present invention is preferably used in combination with a machine tool, such as a milling machine, grinding machine or drilling machine.

[0065] In addition to the above description of the invention, explicit reference is also made to the pictorial representations of the invention in FIGS. 1-10 for additional disclosure of the invention.

[0066] Explanation of symbols 1 Processing tools 2 Tool extension 3 Cutting edge area 4 Cylindrical holding area 5 Cone-shaped stem area 5' Integral clamp region 6 Exposed End of Tool Extension 8 Outer cone 9 Cylindrical part of tool extension 10 Hole 11 Color 12 Bounding Volumes 13. Control Unit 14 Gripper 15 Tool holding device 20 Tool receiving opening 21 Conical receiving area of ​​tool extension 22 Shoulder 30 Handle 31 Free end 100 Workpiece machining equipment 101 Workpiece 102 Processing tools 103 Tool holding device 105 Cone-shaped receptor area 106 Exposed end of tool extension 107 Exposed ends of machining tools 121 Conical receiving area of ​​tool extension A: Distance between exposed end 6 and free end 30 A1 First distance A2 2nd distance D1 diameter of cutting edge area D2 Outside diameter of tool extension at exposed end D3 Inside diameter of tool extension at exposed end D4 Outside diameter of the machining tool at the exposed end E plane K Collision position L Clamping length of the clamping area M center point X center axis a First cone angle / external cone of tool extension b Second cone angle c 3rd cone angle

Claims

1. A processing tool (1) comprising a cutting edge region (3), a handle portion (30) having a conical handle region (5) and a holding region (4) arranged adjacent to the conical handle region (5); a tool extension (2) having a conical receiving area (21); said conical shank region (5) and said conical receiving region (21) are complementary to one another such that said machining tool (1) is held in said tool extension (2) exclusively by a press-fit connection between said conical shank region (5) and said conical receiving region (21); a tool holding device (15) adapted to receive the tool extension (2) and to be connected to a rotatable spindle of a machine tool, The cutting edge region (3) has a maximum diameter D1 in a plane E perpendicular to the central axis X, said plane E intersects with a bounding volume (12), which is an arithmetic extension of the external cone (8) of said tool extension (2), such that a maximum first distance A1 of said bounding volume (12) from said cutting edge region (3) is at most 10% of a diameter D1 of said cutting edge region (3), or said cutting edge region (3) is tangent to said bounding volume (12), or said bounding volume (12) intersects with said cutting edge region (3) such that a maximum second distance A2 of said cutting edge region (3) in said plane E is less than or equal to 30% of a diameter D1 of said cutting edge region (3), The outer cone portion (8) has a first cone angle a of less than or equal to 10°; 1. An apparatus for machining a workpiece, wherein a distance A from a free end (31) of said cutting edge region (3) to an exposed end (6) of said tool extension (2) is less than 5 times a maximum diameter D1 of said cutting edge region (3).

2. said conical stem region (5) being an outer cone having a second cone angle b; 2. The device according to claim 1, wherein the conical receiving area (21) is an inner cone having a third cone angle c.

3. the outer diameter D2 of the exposed end (6) of the tool extension (2) is at most 20% greater than the diameter D1 of the cutting edge region (3); and / or The apparatus of claim 2, wherein the tool extension (2) has a wall thickness at the exposed end (6) in the range of 0.2 mm to 1.0 mm.

4. the conical stem region (105) being an internal cone having a second cone angle b in the processing tool (1); 2. The device according to claim 1, wherein the conical receiving area (121) is an external cone having a third cone angle c at the tool extension (2).

5. 5. The device according to claim 4, wherein the outer diameter D4 of the exposed end (107) of the machining tool is at most 20% greater than the diameter D1 of the cutting edge region (3).

6. Device according to any one of the preceding claims, wherein the tool extension (2) is made of a hard metallic material.

7. 7. The device according to claim 1, wherein the first cone angle a of the outer cone portion (8) is equal to or greater than the second cone angle b of the conical stem region (5) and equal to or greater than the third cone angle c of the conical receiving region (21).

8. The device according to any one of the preceding claims, wherein the second cone angle b of the conical stem region (5) and the third cone angle c of the conical receiving region (21) are in the range of 1.5° to 4°.

9. The device according to any one of the preceding claims, wherein the conical shank region (5) comprises a clamping region (5') having a length L of 1.5 times the diameter D1 of the cutting edge region (3).

10. 10. The device according to claim 1, wherein the machining tool (1) further comprises a radially outwardly projecting circumferential collar (11) arranged between the conical stem region (5) and the holding region (4).

11. 11. The device according to claim 1, wherein the axial press-in path within the range of full contact between the conical stalk region (5) and the conical receiving region (21) and the press-fit connection between the conical stalk region (5) and the conical receiving region (21) is less than or equal to 8% of the diameter D1 of the cutting edge region (3).

12. 12. The device according to claim 11, further comprising a control unit (13) configured to move a gripper (14) which grips the processing tool (1) at the holding area (4) in a path-controlled manner according to a press-fit path between the conical handle area (5) and the conical receiving area (21) so as to form a pressure spring connection between the conical handle area (5) and the conical receiving area (21).

13. 13. The device according to claim 11 or 12, further comprising a control unit (13) adapted to move a gripper (14) which grips the processing tool (1) at the holding area (4) in a force-controlled manner depending on the press-in force between the conical stalk area (5) and the conical receiving area (21) so as to form a pressure spring connection between the conical stalk area (5) and the conical receiving area (21).

14. Apparatus according to any one of the preceding claims, wherein the tool extension (2) comprises an outer housing having the outer conical portion (8) and a cylindrical portion (9).

15. A machine tool comprising an apparatus according to any one of claims 1 to 14.

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