Tool changing device for a machine tool, in particular a machine tool for machining a workpiece

Abstract

Tool changing device (10) for a machine tool (1), which has a tool changing magazine (20) with a magazine ring (21), along the circumference of which a number of tool holders (22, 22a) for receiving tools (W, W') that can be accommodated in a tool spindle (5) of the machine tool (1) and have shanks (S) aligned with respect to the magazine ring (21) can be accommodated, characterized in that the tool changing device (10) has an adjusting device (11) by which the tool changing magazine (20) can be moved from a parking position, in which the tool changing magazine (20) is located outside the working area of ​​the machine tool (1), to a changing position, in which the tool changing magazine (20) is located in the working area of ​​the machine tool (1), in that the tool changing magazine (20) is arranged on the adjusting device (11) of the tool changing device (10),that the tool changing device (10) has a displacement device (25), wherein the displacement device (25) carrying the magazine ring (21) of the tool changing magazine (20) is movable by the adjustment device (11), and wherein the tool changing magazine (20) is movable by the displacement device (25) at least by one chuck length of the tool (W) to be inserted or removed relative to the tool spindle (5) of the machine tool (1) receiving the respective tool (W, W'), that at least one tool (W) in the magazine ring (21) of the tool changing magazine (20) with an outwardly facing shank (S) can be received in the or one of the tool holders (22, 22a), so that the shank (S) of the tool (W) to be inserted or removed can be inserted or removed into the tool spindle (5) by the displacement device (25).

Description

[0001] The invention relates to a tool changing device for a machine tool, which has a tool changing magazine with a magazine ring, along the circumference of which a number of tool holders are arranged for receiving tools that can be received in a tool spindle of the machine tool and have shanks aligned with respect to the magazine ring, a machine tool with a tool spindle for receiving a tool held in a tool changing magazine, and a method for inserting and removing a tool into or from a tool spindle of the machine tool.

[0002] Such a tool changing device and a machine tool using it are known from DE 10 2013 010 701 A1 by the applicant. The tool changing device accommodates the tools to be loaded into the tool spindle of the machine tool in the tool changing magazine of the tool changing device, each with a shaft directed into the interior of the magazine ring. The magazine ring is rotatable about a central column of the machine tool, and the tool holders accommodating the tools are arranged only along a circumferential segment of the tool changing magazine, so that a free circumferential space is formed in the remaining area of ​​the magazine ring. The tool changing magazine has a rotary drive for performing a rotary movement about an axis that is essentially orthogonal to the plane of the magazine ring and extends through its center.

[0003] To replace a tool held in the tool spindle, the tool change magazine is moved from its parked position by a distance greater than or equal to the chuck length of the tool located in the tool spindle, and the tool change magazine is rotated about its axis of rotation until a free tool holder is positioned in front of the tool spindle. The tool change magazine is then moved in a direction opposite to the aforementioned direction of movement until the free tool holder is in its storage position below the tool spindle. This movement of the tool spindle deposits the tool held in it into this tool holder, and a further displacement of the magazine ring moves the tool holder holding the replaced tool away from the tool spindle.

[0004] To change a tool stored in the tool change magazine, the tool change magazine of the tool change device is rotated by its rotating mechanism until the tool holder containing the tool to be changed is positioned in front of the tool spindle. By sliding the magazine ring of the tool change magazine of the tool change device, the tool shank of this tool is chucked into the tool spindle. After the tool has been chucked, the magazine ring is moved away from the tool spindle by a sliding movement, and the magazine ring is rotated back to its parked position.

[0005] From DE 10 2008 059 089 A1, the applicant discloses a machine tool having a tool spindle for machining a workpiece using a tool mounted in the tool spindle, and having a rotatable tool change magazine. The tool change magazine has tool holders arranged around its circumference, into which tools can be accommodated in a defined position of their shank. For a tool change, the tool spindle is moved by an adjusting movement of the adjusting device to the tool change magazine, which is in its home position and pivotably mounted in the machine tool.The tool change magazine is pivotable in such a way that the shaft of the tool to be replaced, which is held in the tool holder, is arranged in a change position of the tool change magazine in front of a holder of the tool spindle, so that the shaft of this tool can be clamped in the holder of the tool spindle by a relative movement between the tool spindle held in the tool change magazine and the tool change magazine, and that the tool to be replaced can be moved out of its tool holder by a relative movement between the tool spindle and the tool change magazine.

[0006] DE 10 2006 037 435 A1 discloses a tool change magazine consisting of a circular magazine disc arranged in a horizontal plane, on whose outer circumference a vertically upward-facing magazine ring is arranged. The magazine disc, the magazine ring, and thus the entire magazine wheel are formed in a circular segment shape within an angular range, thus featuring a segment-shaped free cutout.This cutout serves the purpose of allowing partition walls to be moved into this cutout in the radial direction of the magazine wheel after the known tool change magazine has been moved out of the working area of ​​a machine tool using it, in order to close off the working area of ​​the machine tool in this way: If the partition walls are moved from their closed position, which shields the known tool change magazine from the working area, into an open position, this tool change magazine can be rotated about its vertical axis and its circumference engages in the working area of ​​the machine tool, so that a tool change can be carried out.A coaxially circumferential T-slot is machined into the upper edge of the tool change magazine, into which tool holders forming the magazine ring are inserted. The tool holders sit on the magazine disc with a foot and engage in the T-slot so that the tool holders can be moved in the T-slot in the circumferential direction of the magazine and clamped in the desired position. The tool holders also point vertically upwards from their foot and each form a U-shaped holder that opens upwards for one tool. The holders are designed so that the tool can be inserted into the holder from above. The tools are inserted into the tool holders in such a way that their shanks point radially inwards from the magazine wheel, while the actual tool points radially outwards.

[0007] A machine tool using such a tool change magazine is known from DE 10 2006 037 437 A1. It has a horizontal machine bed on which a tool spindle, in which a workpiece can be clamped, is mounted, movable horizontally in the X-direction. The working area of ​​the tool spindle is enclosed by movable partition walls. Behind the closed partition walls is the tool change magazine described above, in which tools are stored and ready for insertion into the tool spindle. The partition walls of the machine tool engage in the segment-like cutout of the magazine wheel. To perform a tool change, the partition walls are first moved away so that the magazine wheel can be rotated into the working area of ​​the machine tool.This is then rotated via a controlled motor drive so that a free tool holder is brought into the changing position.

[0008] European patent application EP-A 1 886 762 describes a machine tool having a horizontal machine bed on which a tool spindle is mounted so as to be movable horizontally along an X-axis. This tool spindle is arranged horizontally and can be driven in rotation via a workpiece spindle drive. On each side of the machine bed there is a vertically upward-facing side cheek. On the horizontal upper sides of the side cheeks, which run along the Y-axis, there is a Y-guide on each of these guides, on which a bridge is mounted. The bridge can be moved in a controlled manner along the Y-axis and spans a working area of ​​the machine tool between the side cheeks. A Z-slide is arranged centrally in the bridge and can be moved in a controlled manner along the vertical Z-axis and can be rotated about its vertical C-axis.A carrier is attached to the lower end of the Z-slide, on which a rotary-driven tool spindle with a horizontal axis is mounted. The spindle can be moved in a controlled manner along the horizontal axis. The machine tool has a magazine wheel that is driven in a controlled manner about a vertical axis parallel to the Z-axis. The magazine wheel consists of a circular magazine disc lying in a horizontal plane, on whose outer circumference a vertically upward-facing magazine ring is arranged. The magazine disc is seated centrally on a vertical drive shaft and is driven for its rotary movement by a motor. The magazine ring has several tool holders in which tools with shanks pointing towards the interior of the magazine wheel are accommodated.To change a tool, the magazine wheel is rotated from its home position into the work area of ​​the machine tool in such a way that a free tool holder is brought into a change position, i.e. positioned in the Y-movement plane of the Z-slide. The Z-slide is then rotated so that the carrier with the tool spindle is also aligned in this plane. The bridge now moves backwards in the Y-axis until the tool spindle is above the magazine wheel and within the circumference of the magazine ring. The Z-slide is then moved vertically downwards, with the tool being inserted with its gripping groove into the receptacle of the free tool holder. The Z-slide then moves further backwards in the Y-axis, causing the tool spindle to move radially inwards from the magazine ring.After the tool has been deposited in the magazine wheel, the magazine wheel is rotated by the motor until the next selected tool is positioned radially in front of the tool holder of the tool spindle in the change position. In this position, the tool spindle is again pushed radially outward by the Z-slide, causing its tool holder to slide onto the shank of the next tool, which has now been positioned, and clamps it. The Z-slide then moves the tool spindle upwards with the next clamped tool, lifting the tool out of the tool holder.As soon as the tool spindle with the tool is above the magazine ring, the tool spindle can be moved back into its working position and the magazine wheel is turned back to its home position so that the walls separating the working area of ​​the machine tool from the magazine wheel are closed and machining of the workpiece can begin with a new tool.

[0009] DE 28 47 418 A1 describes a plate transfer system along which several machine tools are arranged. Each of these machine tools has tool magazines. At one end of the transfer line, a waiting area is provided for receiving plates on which workpieces to be machined are arranged and secured. At the other end of the transfer line, an area is provided for collecting those plates carrying workpieces whose processing has been interrupted. A self-driven carriage is used to transport the plates through the plate transfer system. This carriage is arranged on the transfer line in such a way that it can move to any desired location along the transfer line by driving its wheels. A transfer bar is used to place a plate on a table of a machining center.The known device functions in such a way that a workpiece to be machined is placed and secured on each plate in the waiting area. The respective plate is then transported by the carriage to a specific machining center and transferred to a table of the respective machining center using the transfer bar. After the workpiece has been machined, the plate and workpiece are moved back onto the carriage by the transfer bar and transported further by this. The device has a second transfer line, which is intended to supplement tools arranged in a tool storage area. The second transfer line has a second carriage similar to the aforementioned carriage, which is arranged so as to be movable on the second transfer line. A tool plate with a tool container for holding several tools is arranged on the second carriage.The tool plate supports a tool robot that can pick up a tool contained in the tool storage and transfer it to the tool container of the tool plate. This tool robot can also transfer defective tools contained in the tool container of the tool plate to a tool storage and cause one or more desired tools to be clamped into a spindle of a specific machining center and removed from the machining center spindle any tool deemed broken or worn.

[0010] It is therefore an object of the present invention to provide a tool-changing device for a machine tool, in particular for a machine tool for machining material, that enables simple tool changing. A machine tool using this tool-changing device and a method for changing a tool are also to be proposed.

[0011] The tool changing device according to the invention provides that the tool changing device has an adjusting device by which the tool changing magazine can be moved from a parking position, in which the tool changing magazine is located outside the working area of ​​the machine tool, to a changing position, in which the tool changing magazine is located in the working area of ​​the machine tool, that the tool changing magazine is arranged on the adjusting device of the tool changing device, that the tool changing device has a displacement device, wherein the displacement device carrying the magazine ring of the tool changing magazine is movable by the adjusting device and wherein the displacement device can move the tool changing magazine at least by one chuck length of the tool to be inserted or removed relative to the tool spindle of the machine tool holding the respective tool,that at least one tool in the magazine ring of the tool change magazine can be accommodated with an outwardly facing shank in the or one of the tool holders, so that the shank of the tool to be removed or replaced can be inserted or removed from the tool spindle by the displacement device.

[0012] The machine tool according to the invention is characterized in that it has the tool changing device according to the invention.

[0013] The method according to the invention provides that the tool changing device according to the invention is used, wherein it is preferably provided that the tool spindle of the machine tool is moved from its parking position to its changing position during the tool change in the opposite direction to the direction of the tool changing magazine.

[0014] The measures according to the invention advantageously provide a tool changing device, a machine tool using the same and a method for changing a tool of a machine tool by means of the tool changing device according to the invention, which are characterized in that the tool changing process can be carried out in a particularly simple manner.By providing according to the invention that the tool change magazine can be moved by an adjusting device from a parking position, in which it is preferably located outside the working area of ​​the machine tool, into a tool change position, in which the tool change magazine is located in front of the tool spindle of the machine tool according to the invention and thus in its working area, and by providing that the tool change magazine can be moved by an adjusting device into this change position relative to the tool spindle, a particularly simple and rapid tool change is achieved in an advantageous manner.The advantage here is that the aforementioned displaceability of the tool change magazine by the adjustment device prevents a displacement movement of the tool spindle, which not only leads to short changeover times, but also advantageously to less wear on the lifting device that moves the tool spindle.

[0015] An advantageous development of the invention provides that at least one tool holder of the magazine ring of the tool change magazine of the tool change device according to the invention is arranged radially in the magazine ring such that, in the change position, the orientation of the shank of the tool accommodated therein coincides with the direction of movement of the adjustment device. Such a measure has the advantage of achieving simple kinematics for the tool change process.

[0016] A further advantageous development of the invention provides that at least one tool holder of the magazine ring of the tool change magazine of the tool change device according to the invention is arranged offset relative to the direction of movement of the adjustment device of the tool change device according to the invention. Such a measure has the advantage of increasing the available space for a tool holder arranged offset in this way.

[0017] A further advantageous development of the invention provides that the adjusting device of the tool-changing device has a boom supporting the tool-changing magazine, which boom is actuated by an actuating unit by which the boom can be moved from the parked position of the tool-changing magazine to its change position. This actuating unit preferably has a pneumatic cylinder acting on the boom, the piston rod of which acts on the boom. The measures according to the invention have the advantage that a pivoting movement of the tool-changing magazine according to the invention from its parked position to its change position can be achieved in a simple manner.

[0018] Further advantageous developments of the invention are the subject of the subclaims.

[0019] Further details and advantages of the invention can be found in the exemplary embodiment described below with reference to the figures. They show: Fig. 1 an embodiment of a machine tool together with an embodiment of a tool changing device in its parking position, Fig. 2 the embodiment of the Fig. 1, wherein the tool change magazine of the tool change device is in its change position, Fig. 3 a plan view of the embodiment according to Fig. 1, Fig. 4 a plan view of the embodiment according to Fig. 2, Fig. 5 the tool changing device of the Fig. 1 to 4, Fig. 6 the tool change magazine of the Fig. 1 to 5, Fig. 7a to 7i a schematic representation of a tool change, Fig. 8 a schematic plan view of the magazine ring of the tool changing device according to the first embodiment, and Fig. 9 a schematic plan view of a magazine ring of a second embodiment of the tool changing device.

[0020] The figures show a machine tool, generally designated 1, whose basic structure is known and therefore will not be described in more detail. The machine tool 1 has a machine bed 2, on which a workpiece carriage 3 is arranged, which can be moved in an X-direction and which supports a workpiece carriage spindle 4, in which the workpiece to be machined (not shown) can be clamped. The workpiece is machined by a tool W, which can be received in a tool spindle 5 and can be driven in rotation by it. The tool spindle 5 is carried by a lifting device 6, which here is designed as a carriage 6' that can be moved in the Y-direction and runs on linear guides 6". Preferably, the tool spindle 5 is pivotable about a rotation axis B, which runs parallel to the aforementioned Y-direction.

[0021] The machine tool 1 has a tool changing device 10 which has a tool changing magazine 20 which can be moved by an adjusting device 11 of the tool changing device 10 from a position in the Fig. 1 and Fig. 3 shown parking position into one in the Fig. 2 and Fig. 4 shown change position. The tool change magazine 20 is - as also described further below - rotatable and movable relative to the tool spindle 5. As best seen from the Fig. 3, the tool change magazine 20 is located in its parking position outside a working area of ​​the machine tool 1.

[0022] In order to move the tool change magazine 20 from its parking position outside the working area of ​​the machine tool 1 into its changing position, in which the tool change magazine 20 is located in front of the tool spindle 5 and thus in the working area of ​​the machine tool 1, the tool change magazine 20 is pivoted into its changing position.

[0023] In order to achieve this pivotability of the tool change magazine 20 from its parking position to its changing position and back, the described embodiment of the tool change device 10 provides that - as best seen from the Fig. 5 and Fig. 6 - the tool change magazine 20 is arranged on a boom 13 of an adjustment device 11 of the tool changing device 10. This is rotatably mounted on a column 12 of the adjustment device 11 and movable by an actuating unit 14. A piston 15 of a pneumatic cylinder 16 of the actuating unit 14 is articulated on the boom 13, wherein the pneumatic cylinder 16 is articulated on a support element 17 of the adjustment device 11. By extending or retracting the piston 15 of the pneumatic cylinder 16, a pivoting movement of the boom 13 and thus of the tool change magazine 20 carried thereby is effected, so that a movement of the tool change magazine 20 between the parking position and the changing position can be achieved in an advantageous and simple manner.

[0024] Preferably, the extension arm 13 is designed to be length-adjustable. In the case described here, this is achieved by the extension arm 13 having a carriage 13a that is movable on a carriage guide 13b. Such a measure has the advantage that the described tool changing device 10 can be easily adapted to differently dimensioned machine tools 1 and / or tools. This length-adjustable design of the extension arm 13 of the adjusting device 11 also has the advantage of simple initial adjustment of the tool changing magazine 20 relative to the tool spindle 5: For this purpose, the tool changing device 10 is mounted in the machine tool 1 with the extension arm 13 retracted. This reduces the risk of a collision and thus damage to the tool spindle 5.Only after the tool changing device 10 has been mounted in the machine tool 1 is the boom 13 pulled apart until the tool changing magazine 20 is correctly positioned in the changing position in front of the tool spindle 5.

[0025] The tool change magazine 20 is now in Fig. 6. It comprises a magazine ring 21 having a base element 23 on which a number of tool holders 22 are arranged. In the case described here, eight tool holders 22 are provided. However, it is clear to a person skilled in the art that the number of eight tool holders 22 mentioned here is only exemplary. The tool holders 22 are designed to be open at the top, so that a tool W can be inserted into each tool holder 22 from above, i.e. in the direction of the negative Y-axis, and can be removed from the respective tool holder 22 opposite to the aforementioned direction, i.e. in the Y-direction. As can be seen from the Fig. As can be clearly seen in Figure 6, it is provided that the shanks S of the tools W in the first embodiment are radially aligned in the respective tool holders 22, specifically such that the shanks S of the tools W point outwards. The machining elements W' of the tools W are thus located inside the magazine ring 21 of the tool change magazine 20, defined by the tool holders 22.

[0026] In the case shown here, the individual tools W are also designed with a coolant supply. However, it will be clear to a person skilled in the art from the following description of the tool change process that the specific design of the tools W is of secondary importance. The only essential factor is that the shanks S of the tools W held in the tool holders 22 are arranged facing outwards.

[0027] The tool changing device 10 has a drive device for the tool changing magazine 20, by means of which the magazine ring 21 of the tool changing magazine 20 can be rotated about its vertical axis. This ensures that the tool holder 22 that accommodates the tool W to be changed, or the tool holder 22 (here, the tool holder 22a) in which the tool W to be changed, located in the tool spindle 5, is to be placed, can be positioned in front of the tool spindle 5.

[0028] The magazine ring 21 is arranged on a displacement device 25, which has linear guides 25a, 25b, on which a carriage 26 carrying the base element 23 of the magazine ring 21 can be displaced. The carriage 26 is driven by a pneumatic cylinder 27, which ensures the lifting movement of the magazine ring 21 described below. It will also be apparent to those skilled in the art from the following description that the described configuration of the displacement device 25, namely a carriage 26 actuated by the pneumatic cylinder 27, is not mandatory. It is also possible to displace the magazine ring 21 linearly by other means, e.g., by an electric motor. The only essential requirement is that the displacement device 25 enables the lifting movement of the magazine ring 21 described below to be achieved during the tool change process.

[0029] The tool change process is now carried out using the Fig. 7a to 7i. For the sake of clarity, all components of the machine tool 1 that are not required to explain the tool change process have been omitted from the schematic representations of Fig. 7a to 7i omitted.

[0030] The tool change magazine 20 is moved from its Fig. 7a shown parking position into its Fig. 7b shown change position. According to the illustration of the Fig. 7b, the tool spindle 5 was rotated around its rotational axis B, which is parallel to the Y-axis, from its position in the Fig. 1 to 4 shown working direction into its tool change position. Fig. The configuration shown in Figure 7b corresponds to a tilt of approximately 20° in a counterclockwise direction. As can be seen from the Fig. 7b, the pivoting movement of the tool spindle 5 occurs opposite to the pivoting direction of the tool change magazine 20 from its parking position to its changing position. The tool spindle 5 thus runs towards the tool change magazine 20 moving in its direction. Such a measure has the effect of shortening the pivoting path of the tool change magazine 20 from its parking position to its changing position and thus reducing the time required by the tool change magazine 20 for this pivoting movement. This has the advantage of reducing the tool changing time. It is preferred that the pivoting movement of the tool spindle 5 from its working position to its changing position is carried out simultaneously or essentially simultaneously with the pivoting movement of the tool change magazine 20 from its parking position to its changing position.

[0031] The described design of the tool changing device 10 and the tool changing process achievable thereby result in a reduced load on the lifting device 6 and thus a longer service life of the machine tool 1.

[0032] The tool change magazine 20 is thus pivoted by a corresponding pivoting movement from its parking position, in which it is located outside the working area of ​​the machine tool 1, into the working area of ​​the same and positioned in its change position in front of the tool spindle 5, while the tool spindle 5 performs its pivoting movement about its B-axis as described above.

[0033] The magazine ring 21 is preferably rotated at the same time until the empty tool holder 22a, into which the tool W located in the tool spindle 5 is to be exchanged, is - as in Fig. 7b - in front of the tool spindle 5.

[0034] As from the Fig. 7c, the magazine ring 21 is then moved by the displacement device 25 in the direction of the tool spindle 5, the length of this displacement movement being at least the chuck length of the tool W to be replaced. Fig. 7c, that the slide 26 of the displacement device 25 carrying the magazine ring 21 is in its Fig. 7c, it is in the left end position, i.e., it has been displaced along the linear guides 25a, 25b by the displacement device 25. In the embodiment shown here, this is achieved by a corresponding stroke movement of the pneumatic cylinder 16.

[0035] As from the Fig. 7d, the tool spindle 5 is lowered in the Y direction. This occurs here by the carriage 6' carrying the tool spindle 5 being moved downward along the linear guides 6" of the lifting device 6 of the machine tool 1. This movement of the tool spindle 5 causes the tool W held therein to be deposited in the free tool holder 22a.

[0036] As from the Fig. 7e, the magazine ring 21 is then moved back by the displacement device 25 at least by the chuck length of the tool W to be replaced, in that the carriage 26 carrying the base element 23 of the magazine ring 21 is moved along the linear guides 25a, 25b by a corresponding actuating movement of the pneumatic cylinder 27 from its position in the Fig. 7b and Fig. 7c shown, left end position into its position in Fig. 7e, further to the right. This movement of the magazine ring 21 causes the shank S of the tool W to be replaced to be removed from the tool spindle 5. The replacement process of the tool W is thus completed.

[0037] In order to now feed a follow-on tool W held in another tool holder 22 into the tool spindle 5, the magazine ring 21 is rotated until the tool W to be changed is located in front of the tool spindle 5.

[0038] As from the Fig. 7f, the magazine ring 21 is again advanced by the displacement device 25 of the tool changing device 10 in the direction of the tool spindle 5, so that the shank S of the tool W is inserted into the tool spindle 5 and the tool W is thus chucked. Since the tool spindle 5 has not moved in the meantime, the shank S of the tool W to be changed is aligned with the tool spindle 5. Any kind of travel movement of the tool spindle 5 is therefore not necessary for chucking the subsequent tool W. This advantageously allows not only short tool change times.

[0039] This also avoids an unnecessary displacement movement of the tool spindle 5: To meet high precision requirements, the lifting device 6 for the tool spindle 5 must be designed with extreme precision in order to position the tool spindle 5 and thus the tool W accommodated in it with sufficient accuracy in relation to the workpiece to be machined. This requires precise guidance of the carriage 6' in the linear guides 6" of the lifting device 6. It is known that such high-precision guides are extremely sensitive and therefore fulfills the aim of avoiding unnecessary displacement movements of the tool spindle 5 and thus of the carriage 6' supporting it.

[0040] As in Fig. 7g, the tool spindle 5 is then raised in the Y direction, whereby the inserted tool W is removed from the tool holder 22b of the tool change magazine 20.

[0041] After moving the magazine ring 21 back to its right end position in the figures (see Fig. 7h) the tool change magazine 20 is moved to its parking position (see Fig. 7i) is moved back, the tool change is thus completed.

[0042] As already mentioned above, in the first embodiment of the described tool changing device 10, tools W are accommodated in the magazine ring 21 of the tool changing magazine 20 of the described tool changing device 10 in such a way that their shafts S each extend in the radial direction, i.e. in the direction of the radial R, of the magazine ring 21. This is evident from the top view of the Fig. 8. It can be seen that the tool holders 22 are aligned such that the shafts S of the tools W accommodated in them each run in the aforementioned radial direction of the magazine ring 21. For this purpose, the tool holders 22 are preferably arranged orthogonally to this radial direction. Fig. 8 also shows that in the change position, the shaft of the tool to be inserted or removed, here the shaft S of the tool W to be inserted, lies in the displacement direction of the displacement device 25, so that by means of a corresponding displacement movement of the latter, the magazine ring 21 of the tool change magazine 20 of the first exemplary embodiment of the displacement device 25 contained in the tool changing device 10 can be inserted into or removed from the tool spindle 5 by means of a displacement movement of the displacement device 25 and thus of the magazine ring 21, which displacement movement runs in the shaft direction. Such an arrangement of the tool holders 22 has the advantage that the kinematics of the tool changing device 10 are relatively simple when loading or unloading the tool W to be inserted or removed.

[0043] In Fig. 9 is now one of the representations of the Fig. 8 shows a plan view of a tool changing device 10 according to a second embodiment. The first and second embodiments differ - as explained below - only in the arrangement of the tool holders 22, so that a repeated description of the other construction of the tool changing device 10, whose tool changing magazine 20 of a machine tool 1 using the tool changing device 10 is not necessary. As described above with reference to Fig. 8, in the first embodiment of the tool changing device 10, it is provided that the tool holders 22 are arranged such that the shanks S of the tools W run in the radial direction of the magazine ring 21, so that the shank direction of the tool W to be inserted or removed from the tool spindle 6 coincides with the direction of movement of the displacement device 25 moving the magazine ring 21.

[0044] In the second embodiment it is now provided that - as can be seen from the Fig.9 - the tool holders 22 are no longer arranged in the tool change magazine 20 as described above. Rather, it is provided that the tool holders 22 are arranged in the magazine ring 21 of the tool change magazine 20 of the second exemplary embodiment in such a way that, in the tool change position, the shank S of the tool W to be inserted or removed runs parallel and offset to the displacement direction of the displacement device 25. The corresponding tool holders 22 are then in turn preferably arranged orthogonally to this shank direction. Such a measure has the advantage that this oblique arrangement of the tool holders 22 increases the space available for accommodating a tool to be inserted or removed.This measure thus advantageously makes it possible either to accommodate larger tools W in the magazine ring 21 or to reduce the size of the magazine ring 21 accordingly, which leads to a more compact design of the described tool changing device 10.

[0045] In the above description, it is assumed that all tool holders 22 of the tool change magazine 20 are arranged either - as in the first embodiment - radially extending, ie a holder of the tools W with a radially extending shaft S, or - as in the second embodiment - offset to the displacement direction of the displacement device 25.

[0046] Of course, it is not absolutely necessary that all tool holders 22 of the tool change magazine 20 always have the same orientation.

[0047] In summary, the described measures result in a tool changing device 10 that is characterized by its simple design. A particular advantage is that the unclamping of the tool W to be replaced and the loading of the subsequent tool W' are essentially carried out by a movement of the tool changing magazine 20. The tool spindle 5 is not moved between the unclamping of the tool W and the loading of the subsequent tool W, which not only leads to short tool changing times. Rather, this also avoids travel movements of the tool spindle 5, which leads to minimal wear on the linear guides 6a, 6b supporting the tool spindle 5.

Claims

[1] Tool changing device (10) for a machine tool (1), which has a tool changing magazine (20) with a magazine ring (21), along the circumference of which a number of tool holders (22, 22a) for receiving tools (W, W') which can be accommodated in a tool spindle (5) of the machine tool (1) and have shanks (S) aligned with respect to the magazine ring (21) can be accommodated, characterized bythat the tool changing device (10) has an adjusting device (11) by means of which the tool changing magazine (20) can be moved from a parking position, in which the tool changing magazine (20) is located outside the working area of ​​the machine tool (1), into a changing position, in which the tool changing magazine (20) is located in the working area of ​​the machine tool (1), that the tool changing magazine (20) is arranged on the adjusting device (11) of the tool changing device (10), that the tool changing device (10) has a displacement device (25), wherein the displacement device (25) carrying the magazine ring (21) of the tool changing magazine (20) is movable by the adjusting device (11) and wherein the displacement device (25) displaces the tool changing magazine (20) at least by one chuck length of the tool (W) to be inserted or removed relative to the chuck length of the respective tool (W,W') receiving the tool spindle (5) of the machine tool (1), that at least one tool (W) in the magazine ring (21) of the tool change magazine (20) with an outwardly facing shank (S) can be received in the or one of the tool holders (22, 22a), so that the shank (S) of the tool (W) to be replaced or removed can be inserted or removed into the tool spindle (5) by the displacement device (25). [2] Tool changing device (10) according to claim 1, characterized by that at least one tool holder (22, 22a) of the tool changing magazine (20) of the tool changing device (10) is arranged such that in the changing position the orientation of the shaft (S) of the tool (W) accommodated in it coincides with the direction of movement of the displacement device (25). [3] Tool changing device (10) according to one of claims 1 or 2, characterized bythat at least one tool holder (22, 22a) of the tool change magazine (20) of the tool change device (10) is accommodated in the tool change magazine (20) in such a way that, at least in the change position, the shank (S) of the tool (W) accommodated in it runs parallel and spaced apart in the direction of movement of the displacement device (25). [4] Tool changing device (10) according to one of the preceding claims, characterized by that the adjusting device (11) of the tool changing device (10) has a boom (13) which carries the tool changing magazine (20), and that the rotatable boom (13) is acted upon by an actuating unit (14) by means of which the boom (13) can be moved from the parking position of the tool changing magazine (20) into its changing position, wherein preferably the actuating device (14) has a pneumatic cylinder (16) acting on the boom (13), the piston rod (15) of which acts on the boom (13). [5] Tool changing device (10) according to claim 4, characterized by that the boom (13) is designed to be variable in length and preferably has a carriage (13a) which is displaceable on a carriage guide (13b). [6] Tool changing device (10) according to one of the preceding claims, characterized by that the magazine ring (21) which can be driven by a drive device has a base element (23) which can be displaced by the displacement device (25). [7] Machine tool (1) having a tool spindle (5) and a tool changing device (10) for inserting and / or removing a tool (W, W') from or into a tool changing magazine (20), characterized by that the tool changing device (10) is designed according to one of claims 1 to 6. [8] Machine tool (1) according to claim 7, characterized bythat the work spindle (5) of the machine tool (1) is pivotable at least against a direction of movement of the tool change magazine (20), which runs from its parking position to its changing position. [9] Method for inserting and / or removing a tool (W, W') into and / or from a tool spindle (5) of the machine tool (1), characterized by that a tool changing device (10) according to one of claims 1 to 6 is used, wherein preferably the tool spindle (5) of the machine tool (1) is moved opposite to the direction of movement of the tool changing magazine (20) from its parking position to its changing position.

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