Working machinery

Abstract

Foreign matter adhering to the tool holder is reliably removed using cleaning fluid. [Solution] The machining center 1 is equipped with a machining chamber 2, a magazine chamber 10 adjacent to the upper side of the machining chamber 2 via a partition plate 15, shutters 22, 22 that can open and close an opening 20, a tool changing means that moves the spindle 4 to a tool changing position P through the opening 20 opened by the shutters 22, 22 to remove a used tool holder 6A from the spindle 4 and attach a new tool holder 6 held on a magazine disk 30 to the spindle 4, and holder cleaning pipes 40, 40 that spray cleaning liquid onto the tool holder 6A at the tool changing position P. The holder cleaning pipes 40, 40 are arranged above the partition plate 15 on both the left and right sides of the tool changing position P and include a pair of nozzles 41, 41 that can spray cleaning liquid onto the tapered portion 7 of the tool holder 6A at the tool changing position P from both the left and right sides.

Description

[Technical Field]

[0001] The present disclosure relates to a machine tool including a machining chamber having a spindle and a magazine chamber containing a plurality of tool holders for holding tools, in which the tool holders attached to the spindle are interchangeable with the tool holders in the magazine chamber. [Background technology]

[0002] Machine tools such as machining centers have adjacent machining chambers, each having a spindle, and a magazine chamber housing a plurality of tool holders for holding tools. The machining chamber and the magazine chamber are separated by a partition plate, and the partition plate has an opening through which the spindle can move to a tool change position within the magazine chamber. The opening is closed by a door member during machining and is opened during tool change. When changing a tool holder, the spindle moves to the tool change position through the opened opening and exchanges the attached tool holder for a tool holder in the magazine chamber.

[0003] When replacing a tool holder, if foreign matter such as chips remains on the tool holder, it will tilt slightly when attached to the spindle, affecting machining accuracy. Therefore, when replacing a tool holder, a cleaning fluid is sprayed onto the used tool holder in the magazine chamber to clean it. For example, Patent Document 1 discloses an invention that provides a cleaning nozzle that sprays coolant (cleaning fluid) toward the tool change position from a position on the opposite side of the opening from the tool change position to prevent foreign matter scattered into the magazine chamber during cleaning from re-adhering to the holder mounting portion of the spindle or the tool holder. In this invention, when replacing a tool holder, coolant is sprayed from the cleaning nozzle toward the machining chamber through the tool change position and the opening, scattering foreign matter toward the machining chamber. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 7411187 Summary of the Invention [Problem to be solved by the invention]

[0005] In the invention of Patent Document 1, the coolant is sprayed onto the tool holder from one direction, so the entire circumference of the tool holder cannot be cleaned, and foreign matter may remain attached to part of the tool holder (especially the surface facing the machining chamber).As a result, there is a risk that the tool holder will be attached to the holder attachment part without the foreign matter being removed. Furthermore, when cleaning the tool holder at the tool change position, some of the foreign matter, such as chips, may scatter into the magazine chamber instead of into the machining chamber, which could result in the foreign matter adhering to the drive source in the magazine chamber and affecting, for example, the operation of the cover that opens and closes the opening or the rotation of the magazine.

[0006] Therefore, an object of the present disclosure is to provide a machine tool that can reliably remove foreign matter adhering to a tool holder using a cleaning liquid. [Means for solving the problem]

[0007] In order to achieve the above object, the present disclosure provides a machining chamber in which a workpiece is machined by a spindle equipped with a tool holder for holding a tool; a magazine chamber adjacent to an upper side of the machining chamber via a partition plate having an opening, the magazine chamber containing a tool magazine holding a plurality of the tool holders, and allowing a predetermined tool holder to be moved to a predetermined tool change position above the opening; a door member that can open and close the opening; a tool changing means for moving the spindle to the tool changing position through the opening while the door member is keeping the opening open, removing the used tool holder from the spindle, and attaching a new tool holder held in the tool magazine to the spindle; and a holder cleaning unit that sprays cleaning liquid onto the tool holder at the tool changing position in the magazine chamber. The holder cleaning units are disposed above the partition plate on both the left and right sides of the tool changing position, and spray cleaning liquid onto the tool holder at the tool changing position from both the left and right sides. and clean the entire circumference of the tool holder. The nozzles may include at least one pair of nozzles. Another aspect of the present disclosure is characterized in that, in the above-mentioned configuration, a splash prevention cover is provided above the tool changing position in the magazine chamber, overlapping at least the tool holder at the tool changing position in the vertical direction and preventing splashing of cleaning liquid sprayed onto the tool holder from both the left and right sides. Another aspect of the present disclosure is characterized in that, in the above configuration, a second nozzle is provided at a position above the nozzle, which sprays cleaning liquid toward a location higher than the tool changing position in the magazine chamber when the nozzle sprays cleaning liquid onto the tool holder. [Effects of the Invention]

[0008] According to the present disclosure, since the cleaning liquid is sprayed from both the left and right directions onto the tool holder at the tool replacement position, the entire circumference of the tool holder can be cleaned and foreign matter adhering to the tool holder can be reliably removed by the cleaning liquid. Therefore, the tool holder will not be attached to the spindle with foreign matter adhering to part of it. According to another aspect of the present disclosure, in addition to the above-mentioned effects, a splash prevention cover is provided that overlaps the tool holder at the tool change position in the vertical direction, so that even if the cleaning fluid sprayed onto the tool holder from the nozzles on both sides splashes upward, it is caught by the splash prevention cover and falls back without scattering over a wide area. Therefore, there is no risk that foreign matter removed from the tool holder or the splashed cleaning fluid will splash over and adhere to a wide area within the magazine chamber, thereby affecting the operation of the door member or the tool magazine. According to another aspect of the present disclosure, in addition to the above-mentioned effects, a second nozzle is provided at a position above the nozzle, which sprays cleaning liquid toward a location in the magazine chamber that is higher than the tool changing position. Therefore, foreign matter removed from the tool holder is washed away toward the machining chamber by the cleaning liquid sprayed from the second nozzle, and does not accumulate in the magazine chamber. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 2 is a front view showing a part of the machining chamber and the magazine chamber of the machining center. [Figure 2] FIG. 2 is a partial cross-sectional view taken along the line AA in FIG. [Figure 3] FIG. 2 is a cross-sectional view taken along line BB in FIG. [Figure 4] FIG. 2 is a cross-sectional view taken along line CC in FIG. [Figure 5] FIG. 10 is a front perspective view of the lower part of the magazine chamber, omitting the magazine disk and the cleaning pipe cover. [Figure 6] FIG. 10 is a partial front view showing the interior cleaning state and the state where the spindle has reached the tool changing position. [Figure 7] FIG. 7 is a cross-sectional view taken along the line DD in FIG. 6. [Figure 8] FIG. 10 is a partial front view showing the interior of the chamber being cleaned and the used tool holder being cleaned. [Figure 9] FIG. 9 is a cross-sectional view taken along the line EE in FIG. 8. [Figure 10] FIG. 10 is an explanatory view showing the cleaning state of a used tool holder from below the opening. [Figure 11] FIG. 10 is a partial front view showing the state in which the chamber has been cleaned and the state in which a spindle with a new tool holder attached has been moved into the machining chamber. [Figure 12] FIG. 12 is a cross-sectional view taken along the line FF in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. Fig. 1 is a front view showing a part of a machining chamber and a magazine chamber in a machining center, which is an example of a machine tool, Fig. 2 is a partial cross-sectional view taken along line AA in Fig. 1, Fig. 3 is a cross-sectional view taken along line BB in Fig. 1, and Fig. 4 is a cross-sectional view taken along line CC in Fig. 1. In this embodiment, the machining chamber side is defined as the front, and the function chamber side is defined as the rear, defining the front-rear, left-right, and up-down directions. The machining center 1 has a machining chamber 2 formed in front of a function chamber (not shown) that houses the machine body. A portal frame 3 is provided between the function chamber and the machining chamber 2, and the machine body is equipped with a spindle 4 that protrudes into the machining chamber 2 from the inside of the portal frame 3. The front, top, and left and right sides of the machining chamber 2 are covered by a cover (not shown). The spindle 4 can move back and forth and left and right together with the machine body, and can also move up and down relative to the machine body. A holder mounting portion 5 is formed at the front end of the spindle 4. A tool holder 6 can be attached to the holder mounting portion 5 with the tapered portion 7 of the tool holder 6 attached with a tool T inserted into it. An air passage is provided inside the spindle 4, allowing compressed air supplied from an air supply source (not shown) to be sprayed from the inner surface of the holder mounting portion 5.

[0011] A magazine chamber 10 is installed adjacent to the upper side of the processing chamber 2. The magazine chamber 10 is supported on the front side of the gate-shaped frame 3 via a pair of support arms 11, 11 that are attached to the left and right sides of the upper surface of the gate-shaped frame 3 and extend downward. The magazine chamber 10 has an outer shell made up of a lower outer cover 12, an upper outer cover 13, and a rear cover 14. The front surface of the magazine chamber 10 is covered by a front cover (not shown). The lower outer cover 12 has a partition plate 15 and left and right side plates 16, 16. The partition plate 15 extends in the left-right direction to separate the processing chamber 2. The left and right upper surfaces of the partition plate 15 are connected to the support arms 11, 11, respectively. The side plates 16, 16 extend upward from both left and right ends of the partition plate 15 outside the support arms 11, 11. The upper outer cover 13 is bent so as to form the upper half of an octagon when viewed from the front, and both ends are positioned inside the support arms 11, 11. The rear cover 14 is joined to both outer covers 12, 13 and has a shape that closes the area surrounded by the lower outer cover 12 and the upper outer cover 13 from the rear.

[0012] A pair of left and right inner covers 17, 17 are provided inside the magazine chamber 10. The upper ends of the inner covers 17, 17 are connected to the left and right ends of the upper outer cover 13 inside the support arms 11, 11, and extend downward toward the center of the partition plate 15, then bend downward to form an inclined shape that connects to the partition plate 15. An opening 20 is formed in the center of the partition plate 15 and the rear cover 14 in the left-right direction. The opening 20 has an L-shaped vertical cross section, spanning from the partition plate 15 to the rear cover 14, and communicates with the machining chamber 2. The opening 20 is large enough to allow the spindle 4 to pass through in the vertical direction. A pair of communication openings 21, 21 are formed in the partition plate 15 on the left and right outside of the opening 20. The communication openings 21, 21 are formed closer to the center than the lower ends of the inner covers 17, 17 and communicate with the processing chamber 2.

[0013] A pair of shutters 22, 22 capable of opening and closing the opening 20 are provided within the magazine chamber 10. Each shutter 22 is an L-shaped plate in a side view, consisting of a lower plate 23 located above the partition plate 15 and a rear plate 24 located in front of the rear cover 14, and is large enough to close each half of the opening 20. Upward-facing raised portions 25, 25 are bent and formed at the front end and the outer left and right ends of the lower plate 23. The shutters 22, 22 are an example of a door member of the present disclosure. A pair of left and right cylinders 26, 26 are attached to the inner surface of the rear cover 14 in the left-right direction with piston rods 27, 27 facing each other. The cylinders 26 operate in unison using air or hydraulic pressure. The ends of the piston rods 27 are connected to the lower plates 23 of the shutters 22 via connecting plates 28. Therefore, when the piston rods 27, 27 extend, the shutters 22, 22 slide toward the center on the left and right to a closed position that closes the opening 20. When the piston rods 27, 27 retract, the shutters 22, 22 slide outward on the left and right to an open position that opens the opening 20.

[0014] Within the magazine chamber 10, a magazine disk 30 is provided in an area surrounded by the lower outer cover 12 and the upper outer cover 13. The magazine disk 30 is circular when viewed from the front, and has a rotating shaft 31 extending rearward at its center. The rotating shaft 31 is supported in the front-rear direction by brackets 33 provided at the center of the left and right sides on a support plate 32 fixed to the upper surface of the portal frame 3. A motor 34 that rotates the magazine disk 30 is provided on the rotating shaft 31. The outer peripheral surface of the magazine disk 30 is provided with multiple pairs of gripping jaws 35, 35... that protrude radially outward and are arranged in the circumferential direction. Only three pairs are shown in each drawing, with the rest omitted. Each gripping jaw 35, 35 grips a tool holder 6 with a tool T attached, facing forward and parallel to the central axis of the magazine disk 30. A tool change position P is located radially outward of the magazine disk 30 and directly below the central axis. The magazine disk 30 is rotated by a motor 34, so that a specific tool holder 6 gripped by the gripping jaws 35, 35 can be indexed to the tool change position P. The magazine disk 30 is an example of a tool magazine disclosed herein.

[0015] As shown in FIG. 5 , a pair of left and right holder cleaning pipes 40 are provided below the magazine disc 30 and above the left and right cylinders 26. Each holder cleaning pipe 40 has a nozzle 41 at its tip and a tube 42 connected to its base end. The holder cleaning pipes 40 are supported laterally by mounting plates 43 attached to the rear cover 14, with the nozzles 41 facing each other. The tips of the nozzles 41 are tilted slightly upward and forward toward the side surfaces of the tapered portion 7 on the rear side of the tool holder 6 indexed to the tool change position P between them, spraying cleaning liquid (e.g., coolant) in a straight (jet-like) manner. Therefore, the cleaning liquid sprayed from the tips of the nozzles 41 is directly applied to the left and right side surfaces of the tapered portion 7. The tubes 42 pass through the rear cover 14 and are connected to a joint 44 attached to the support plate 32. A cleaning pipe (not shown) is connected to the joint 44. The cleaning pipe has a pump and a switching valve and is connected to a cleaning liquid tank (not shown). The upper and front sides of each holder cleaning pipe 40 are covered by a cleaning pipe cover 45 that is L-shaped when viewed from the side and is attached to the inner surface of the rear cover 14. However, the tip of each nozzle 41 is exposed to the tool changing position P side.

[0016] The rear cover 14 is provided with indoor cleaning nozzles 50A to 50C. The indoor cleaning nozzles 50A to 50C are arranged symmetrically, three on each side of the rotating shaft 31 on the rear side of the magazine disk 30. Each indoor cleaning nozzle 50A to 50C also penetrates the rear cover 14 and is connected to a respective joint 51, 51 provided on the support plate 32. Each joint 51 is connected to a cleaning liquid tank via a cleaning pipe separate from the holder cleaning pipe 40. The indoor cleaning nozzles 50A to 50C are an example of a second nozzle of the present disclosure. The indoor washing nozzles 50A, 50A located on the outermost left and right sides have their tips bent downward in front of the rear cover 14. The inner covers 17, 17 are located below the indoor washing nozzles 50A, 50A. Each indoor washing nozzle 50A sprays the washing liquid onto the inner cover 17 in a shower-like dispersion. The two indoor cleaning nozzles 50B, 50C located on the left and right of the rotating shaft 31 also have their tips bent downward in front of the rear cover 14. The tip of the indoor cleaning nozzle 50C is tilted more toward the center on the left and right than the tip of the indoor cleaning nozzle 50B. Cleaning pipe covers 45 are located below the indoor cleaning nozzles 50B, 50C. The indoor cleaning nozzles 50B, 50C spray cleaning liquid straight onto the top surface of the cleaning pipe cover 45.

[0017] The rear cover 14 is provided with a shatterproof cover 55. The shatterproof cover 55 has an upper surface 56, a pair of inclined surface portions 57, 57, and a rear inclined surface portion 58. The upper surface 56 is a flat surface extending in the left-right direction. The inclined surface portions 57, 57 are inclined surfaces that become lower from the left and right ends of the upper surface 56 toward the left and right outer sides. The rear inclined surface portion 58 is an inclined surface that becomes lower from the rear ends of the upper surface 56 and the inclined surface portions 57, 57 toward the rear. A connecting bar 59 with a V-shaped cross section that extends to the right is fixed to the upper surface 56. The right end of the connecting bar 59 is fixed to the lower end of a hanging plate 60. The upper part of the hanging plate 60 is attached to the support plate 32, penetrates the rear cover 14, extends downward on the front side of the rear cover 14, and is fixed to the connecting bar 59. The scattering prevention cover 55 is supported in a posture inclined downwards toward the front between the central axis of the magazine disc 30 and the tool changing position P. In this state, the top surface 56 is located above the tapered portion 7 of the tool holder 6 (hereinafter referred to as "6A" when distinguishing between them) located at the tool changing position P, as shown in Figures 8 and 10, and the left and right inclined surface portions 57, 57 are located above the tapered portions 7 of the tool holders 6, 6 (hereinafter referred to as "6B" when distinguishing between them) located on the left and right of the tool changing position P.

[0018] In the machining center 1 configured as described above, an NC device (not shown) provided adjacent to the function room performs machining of a workpiece in the machining room 2 based on a preset NC program. When a tool needs to be changed during machining, the tool is changed on the spindle 4. The procedure for changing tools by the NC device will be described below. During the pre-processing, the left and right shutters 22, 22 are in the closed position to close the opening 20, as shown in FIGS. When a tool change is performed from this position, the NC device first activates the pumps and switching valves of the cleaning pipes connected to the interior cleaning nozzles 50A-50C, as shown in Figures 6 and 7, and sprays cleaning liquid from each of the interior cleaning nozzles 50A-50C to clean the inside of the magazine chamber 10. The cleaning liquid C1, C1 sprayed from the interior cleaning nozzles 50A, 50A is sprayed above the tool change position P on the interior covers 17, 17 to clean the interior covers 17, 17. The cleaning liquid C2, C2 sprayed from the interior cleaning nozzles 50B, 50C is also sprayed above the tool change position P on the cleaning pipe covers 45, 45 to clean the cleaning pipe covers 45, 45. The cleaning liquid that falls onto the partition plate 15 falls into the machining chamber 2 through the communication ports 21, 21, and is collected in a collection tank from a discharge port provided at the bottom of the machining chamber 2.

[0019] After cleaning the inside of the magazine chamber 10, the NC device operates the left and right cylinders 26, 26 to move the left and right shutters 22, 22 to the open position. Then, as shown in Figures 6 and 7, the NC device moves the spindle 4 upward to grip the tool holder 6A with the gripping jaws 35, 35 at the tool change position P, and then retracts the spindle 4 while spraying compressed air from the inner surface of the holder mounting portion 5 through the air passage of the spindle 4 to blow air toward the tapered portion 7 of the tool holder 6A. Note that at this time, the cleaning liquids C1, C2 are still being sprayed from the internal cleaning nozzles 50A to 50C.

[0020] The NC device then operates the switching valves of the cleaning piping to the holder cleaning pipes 40, 40, causing the left and right nozzles 41 to spray cleaning liquid toward the tool holder 6A at the tool change position P removed from the spindle 4. As a result, the cleaning liquids C3, C3 sprayed from the nozzles 41, 41, are sprayed onto the left and right side surfaces of the front portion of the tapered portion 7, cleaning the tapered portion 7, as shown in FIGS. 8 to 10 . Because the nozzles 41, 41, are positioned below the tool change position P and spray the cleaning liquids C3, C3 upward toward the tapered portion 7 of the tool holder 6A, the sprayed cleaning liquids C3, C3 directly impinge on the tapered portion 7 of the tool holder 6A without impinging on the tapered portions 7 of the tool holders 6B, 6B adjacent to the tool holder 6A on the left and right. Therefore, even if foreign matter such as chips adheres to the tapered portion 7 of the tool holder 6A, it is reliably removed by the cleaning liquids C3, C3. When cleaning the tapered portion 7, the cleaning liquids C1 and C2 are sprayed from the chamber cleaning nozzles 50A-50C, so even if the cleaning liquid sprayed onto the tapered portion 7 splashes into the magazine chamber 10, it does not remain inside the magazine chamber 10. Compressed air is also sprayed from the inner surface of the holder mounting portion 5, so the cleaning liquid does not enter the holder mounting portion 5. Furthermore, because a splash prevention cover 55 is located above the tool holder 6A, even if the cleaning liquids C3 and C3 sprayed onto the tapered portion 7 splash upward, they are caught by the splash prevention cover 55 and fall without splashing upward. The fallen cleaning liquid falls into the machining chamber 2 through the opening 20 or the communication port 21 and is discharged.

[0021] 8 and 9, when the spindle 4 is retracted to the retracted position and cleaning of the tapered portion 7 of the removed tool holder 6A is completed, the NC device rotates the magazine disc 30 to index the next tool holder 6 to be used to the tool changing position P. Therefore, the tapered portion 7 of the next tool holder 6 to be used is also cleaned with the cleaning fluids C3, C3 from the nozzles 41, 41. The NC device then advances the spindle 4 and attaches the next tool holder 6 to the holder attachment portion 5, stopping the spraying of cleaning fluid C3 from the nozzles 41 and the blowing of compressed air from the inner surface of the holder attachment portion 5. When the spindle 4 subsequently descends, the tool holder 6 is removed from the gripping jaws 35 at the tool change position P, and the spindle 4 enters the machining chamber 2, as shown in FIGS. 11 and 12. The NC device then activates the left and right cylinders 26 to move the left and right shutters 22 to the closed position, closing the opening 20, and the next machining operation is performed. Once the opening 20 is closed, the cleaning fluid from the chamber cleaning nozzles 50A-50C stops.

[0022] The machining center 1 of the above embodiment includes: a machining chamber 2 in which a workpiece is machined by a spindle 4 equipped with a tool holder 6 that holds a tool; a magazine chamber 10 adjacent to the upper side of the machining chamber 2 via a partition plate 15 having an opening 20, which stores a magazine disk 30 that holds a plurality of tool holders 6 and allows a predetermined tool holder 6 to be moved to a predetermined tool change position P above the opening 20; shutters 22, 22 that can open and close the opening 20; tool change means (magazine disk 30, rotating shaft unit 31, motor 34, NC device) that moves the spindle 4 to the tool change position P through the opening 20 opened by the shutters 22, 22, removes a used tool holder 6 from the spindle 4, and attaches a new tool holder 6 held on the magazine disk 30 to the spindle 4; and a holder cleaning unit (holder cleaning pipes 40, 40) that sprays cleaning liquid onto the tool holder 6A at the tool change position P within the magazine chamber 10. The holder cleaning pipes 40, 40 are arranged above the partition plate 15 on both the left and right sides of the tool changing position P, and include a pair of nozzles 41, 41 that can spray cleaning liquid from both the left and right sides onto the tapered portion 7 of the tool holder 6A at the tool changing position P.

[0023] According to this configuration, the cleaning liquid is sprayed onto the tool holder 6A from both the left and right directions, so the entire circumference of the tapered portion 7 of the tool holder 6A can be cleaned and foreign matter adhering to the tapered portion 7 can be reliably removed by the cleaning liquid. Therefore, the tool holder 6A will not be mounted on the spindle 4 with foreign matter adhering to part of the tapered portion 7.

[0024] Above the tool changing position P in the magazine chamber 10, a splash prevention cover 55 is provided which overlaps the tapered portion 7 of the tool holder 6A at the tool changing position P in the vertical direction and prevents the cleaning liquid sprayed from both the left and right sides from splashing onto the tapered portion 7. Therefore, even if the cleaning liquid sprayed onto the tapered portion 7 of the tool holder 6A from the nozzles 41, 41 on both the left and right sides splashes upward, it is caught by the anti-scattering cover 55 and falls back without scattering over a wide area. Therefore, there is no risk that foreign matter removed from the tapered portion 7 or the splashed cleaning liquid will splash onto and adhere to the magazine disk 30 or other tool holders 6, etc., and affect the operation of the shutters 22, 22 or the tool magazine disk 30. Located above the nozzles 41, 41 are indoor cleaning nozzles 50A to 50C that spray cleaning liquid toward a location higher than the tool changing position P within the magazine chamber 10 when the nozzles 41, 41 spray cleaning liquid onto the tool holder 6A. Therefore, the foreign matter removed from the tapered portion 7 is washed away toward the machining chamber 2 by the cleaning liquid sprayed from the interior cleaning nozzles 50A to 50C, and does not accumulate inside the magazine chamber 10.

[0025] Modifications of the present disclosure will be described below. The holder cleaning pipe may be provided with multiple pipes on each side instead of one on each side. In this case, the multiple holder cleaning pipes may be arranged at different heights up and down or at different intervals from front to back. The nozzle may be branched to spray cleaning liquid from multiple locations. As long as the nozzle is facing the tool holder, the holder cleaning pipe does not need to be supported in the left-right direction. The cleaning liquid sprayed from the nozzle does not have to be straight. The horizontal length of the splash guard cover may be shorter than that of the above embodiment as long as it covers at least the area above the tool holder at the tool changing position. The shape of the splash guard cover may also be changed as appropriate. The splash guard cover may also be omitted. The number of interior cleaning nozzles on the left and right can be increased or decreased as needed. The direction and spray shape of the nozzles can also be changed as needed. For example, it is possible to use a single interior cleaning nozzle that sprays onto the cleaning pipe cover, spraying the cleaning liquid in a shower-like manner. It is also possible to eliminate the interior cleaning nozzle that sprays onto the cleaning pipe cover and only provide an interior cleaning nozzle that sprays onto the inner cover. The interior cleaning nozzle may not be necessary.

[0026] The shutters do not have to be a pair, and the opening may be opened and closed by sliding a single shutter. The door element is not limited to a single-plate shutter, but may be formed of multiple plates. The door element may be provided to be extendable so as to open and close the opening. The tool magazine may be a type that rotates a chain with multiple gripping jaws attached, rather than a type that rotates a magazine disk. In this case, the tool magazine is not limited to a circular shape, but may also be oval, square, or serpentine. A changer arm may also be used for tool replacement. The present disclosure is also applicable to machine tools other than machining centers. [Explanation of symbols]

[0027] 1··Machining center, 2··Processing chamber, 4··Main spindle, 5··Holder mounting section, 6··Tool holder, 7··Taper section, 10··Magazine chamber, 12··Lower outer cover, 13··Upper outer cover, 15··Partition plate, 20··Opening, 22··Shutter, 26··Cylinder, 30··Magazine disc, 40··Holder cleaning pipe, 41··Nozzle, 45··Cleaning pipe cover, 50A~50C··Indoor cleaning nozzle, 55··Spatter prevention cover, T··Tool.

Claims

1. a machining chamber in which workpieces are machined using a spindle equipped with a tool holder for holding a tool; a magazine chamber adjacent to an upper side of the machining chamber via a partition plate having an opening, the magazine chamber containing a tool magazine holding a plurality of the tool holders, and allowing a predetermined tool holder to be moved to a predetermined tool change position above the opening; a door member that can open and close the opening; a tool changing means for moving the spindle to the tool changing position through the opening while the door member is keeping the opening open, removing the used tool holder from the spindle, and attaching a new tool holder held in the tool magazine to the spindle; and a holder cleaning unit that sprays cleaning liquid onto the tool holder at the tool changing position in the magazine chamber, the holder cleaning units are arranged above the partition plate on both the left and right sides of the tool change position, and include at least one pair of nozzles capable of spraying cleaning liquid onto the tool holder at the tool change position from both the left and right sides to clean the entire circumference of the tool holder.

2. 2. The machine tool according to claim 1, wherein a splash prevention cover is provided above the tool changing position in the magazine chamber, the splash prevention cover overlapping at least the tool holder at the tool changing position in the vertical direction and preventing splashing of cleaning liquid sprayed from both the left and right sides onto the tool holder.

3. 3. The machine tool according to claim 1, wherein a second nozzle is provided at a position above the nozzle for spraying cleaning liquid toward a location in the magazine chamber that is higher than the tool changing position when the nozzle sprays cleaning liquid onto the tool holder.

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