JP5170453B2 - Machine Tools - Google Patents

Description

  The present invention relates to a machine tool provided with a tool magazine or a pot having a plurality of tool holding portions in a rotatable manner, and more particularly to a machine tool that ejects a cleaning liquid onto a tool mounting portion to perform cleaning.

  2. Description of the Related Art Conventionally, in machine tools, the periphery of a workpiece to be cut is covered with a coolant curtain to prevent chips from being scattered. However, according to this, although the scattering of the chips can be prevented by the curtain of the coolant, the coolant is scattered and adheres to various places. There are cases where the coolant liquid contains chips, and there are cases where the chips adhere to the scattered coolant liquid.

  In a turret type machine tool provided with a tool magazine for holding a plurality of tools in the same room as a part to be cut of a workpiece, such chips may adhere to a tool shank or the like. If chips adhere to the shank or the like of the tool, when the tool is changed by the automatic tool changer, the tool cannot be changed normally, which causes a reduction in machining accuracy.

  2. Description of the Related Art In recent years, a cleaning device is known that ejects a cleaning liquid onto a shank or the like of a tool to be replaced before the tool to be replaced is mounted on a spindle by an automatic tool changer (for example, Patent Documents). 1). In this cleaning device, the automatic tool changer starts an indexing operation in which the tool magazine is rotated to move the next tool to be changed to the mounting position on the spindle, and at the same time, the cleaning liquid starts to be ejected.

JP 2005-28460 A

  In the turret type machine tool as in the above prior art, the necessary turning amount (number of turning pitches) of the tool magazine in the indexing operation differs depending on the position of the tool to be replaced. For example, in the case of a tool magazine provided with tool holders at 21 locations in the circumferential direction, when the tool to be replaced is at the farthest position, the number of turning pitches is 10 for half-turn turning, but at the nearest position Becomes the minimum value of 1. Therefore, the time required for the indexing operation varies depending on the position of the tool to be replaced. In the above prior art, the indexing operation is started, and at the same time, the cleaning device starts to eject the cleaning liquid. For this reason, when the time required for the indexing operation is long, the cleaning liquid is ejected for a long time by the cleaning device, and the cleaning liquid is wasted.

  An object of the present invention is to provide a machine tool that can prevent wasteful consumption of cleaning liquid.

  In order to achieve the above object, a machine tool according to a first aspect of the present invention includes a spindle head that rotatably supports a spindle having a tool engaging portion that holds a tool, and moves the spindle head in the vertical direction. A tool that holds a tool holder to which the tool is attached and a vertical movement mechanism that can be positioned at a machining reference position that serves as a positioning reference when cutting with a tool and an exchange reference position that serves as a positioning reference when replacing the tool A rotation type magazine provided with holding portions in a plurality of locations in the circumferential direction, and a magazine driving means for rotating the rotation type magazine in the circumferential direction when the spindle head is located at the replacement reference position; While the spindle head moves from the machining reference position to the replacement reference position, the tool is interposed between the tool engaging portion of the spindle and the tool holding portion of the rotary magazine. A tool exchanging mechanism that can be exchanged, a cleaning nozzle that ejects a cleaning liquid for cleaning a tool that is newly mounted on the tool engaging portion of the main spindle when the tool is changed by the tool exchanging mechanism, and the cleaning nozzle In a machine tool comprising a cleaning mechanism having a cleaning liquid supply means for supplying a cleaning liquid, the tool holder holding a tool to be newly mounted on the tool engaging portion of the spindle according to the circumferential position of the rotary magazine A moving amount calculating means for calculating the moving amount of the rotary magazine by the magazine driving means at the time of tool change, and the cleaning liquid supplying means to the cleaning nozzle based on the moving amount calculated by the moving amount calculating means. Supply timing determining means for determining the supply start timing of the cleaning liquid, and the cleaning liquid supply means is determined by the supply timing determining means. When it turned to the supply start timing, and supplying a cleaning liquid to said cleaning nozzle.

  The machine tool of the first invention of the present application includes a spindle head that supports the spindle. The main shaft includes a tool engaging portion, and performs predetermined processing on the workpiece by holding and rotating the tool in the tool engaging portion. The tool engaging portion of the spindle can be used by attaching and detaching a plurality of tools. A tool change mechanism that performs tool change includes a rotary magazine and a magazine drive means. The rotary magazine includes tool holders at a plurality of locations in the circumferential direction, and each tool holder can hold a tool holder to which a tool is attached.

  When the tool is changed, the cleaning mechanism performs cleaning so that chips and the like are not attached to the tool newly attached to the spindle. The cleaning liquid supply means supplies the cleaning liquid to the cleaning nozzle, and the cleaning nozzle ejects the cleaning liquid toward the tool. In order to prevent wasteful consumption of the cleaning liquid, it is preferable to start ejection from the cleaning nozzle as soon as possible while holding a new tool in the tool engaging portion of the spindle.

  At the time of tool change, after the spindle head moves from the machining reference position to the change reference position, the magazine driving means rotates the rotary magazine in the circumferential direction. After the tool to be newly mounted is moved to a predetermined position (for example, the lowermost part) by this rotational drive, the spindle head moves from the replacement reference position to the machining reference position, and delivers the tool to the tool engaging portion of the spindle. The time required for the movement by the rotational drive differs depending on the position in the circumferential direction of the rotary magazine at the start of rotation of the tool holder to which the newly mounted tool is attached. In the machine tool according to the first aspect of the present invention, the movement amount calculating means calculates the movement amount of the rotary magazine at the time of tool change according to the circumferential position of the tool holder holding the newly mounted tool. Based on the amount of movement, the supply timing determining means determines the supply start timing of the cleaning liquid. When the supply start time comes, the cleaning liquid supply means supplies the cleaning liquid to the cleaning nozzle.

  When the circumferential position of the tool holder holding the newly mounted tool is far from a predetermined location for delivering the tool, the amount of movement of the rotary magazine is large and the rotational drive time is long. Determines the supply start time later. When the circumferential position of the tool holder holding the newly mounted tool is close to the predetermined location for delivering the tool, the amount of movement of the rotary magazine is small and the rotational drive time is shortened. Determines the supply start time early. As a result, when the tool is replaced, the cleaning liquid can be ejected at an appropriate timing immediately before the tool is attached to the spindle, regardless of the position of the tool holder to which the new tool is attached. As a result, wasteful consumption of the cleaning liquid can be prevented. Since wasteful circulation of the cleaning liquid can be prevented, deterioration of the cleaning liquid can be suppressed.

  A machine tool according to a second aspect of the present invention further comprises correlation storage means for storing a correlation between the predetermined amount of movement of the rotary magazine and the supply start time of the cleaning liquid, as defined in the first aspect. The time determination means determines the supply start time with reference to the correlation stored in the correlation storage means based on the movement amount calculated by the movement amount calculation means.

  In the machine tool according to the second aspect of the present invention, the amount of movement of the rotary magazine and the cleaning liquid supply start timing are stored in advance as correlations, and the supply timing determination means determines the cleaning liquid supply start timing with reference to the correlation. Thereby, rough pattern division can be performed in advance, and supply start control of the cleaning liquid can be easily performed by a simple method based on the pattern division.

  In the machine tool according to a third aspect of the present invention, in the first or second aspect of the invention, the supply timing determining means moves the spindle head from the machining reference position to the replacement reference position when the movement amount is smaller than the first reference value. When the movement is started, the supply start time is set. When the movement amount is larger than the second reference value, the rotational driving of the rotary magazine is finished, and the spindle head is moved from the replacement reference position to the machining reference position. When the movement is started, the supply start time is set. When the movement amount is not less than the first reference value and not more than the second reference value, the spindle head is moved from the machining reference position to the replacement reference position. When the rotary magazine starts to rotate after the movement is completed, the supply start time is set.

  As described above, when changing the tool, after the spindle head moves from the machining reference position to the exchange reference position, the magazine drive means rotates the rotary magazine in the circumferential direction, and the spindle head moves from the exchange reference position. Move to the machining reference position. Since the rotational drive time is short when the amount of movement of the rotary magazine is small, the cleaning liquid supply means supplies the cleaning liquid to the cleaning nozzle as soon as the spindle head starts to move from the processing reference position to the replacement reference position. Thus, the cleaning liquid can be surely ejected before the new tool is attached to the main shaft. Since the rotational drive time is long when the amount of movement of the rotary magazine is large, the cleaning liquid supply means supplies the cleaning liquid to the cleaning nozzle when the spindle head starts to return from the replacement reference reference position to the processing reference position. Thereby, it is possible to prevent waste due to the ejection of the cleaning liquid more quickly than necessary. When the amount of movement of the rotary magazine is medium, the cleaning liquid supply means supplies the cleaning liquid to the cleaning nozzle when the rotary magazine starts rotating between the two cases.

  As described above, regardless of the position of the tool holder to which a new tool is attached, the cleaning liquid can be surely ejected at an appropriate timing immediately before the tool is attached to the main shaft.

  A machine tool of a fourth invention is a rotation time calculation for calculating a rotation drive time Mt of the rotary magazine corresponding to the movement amount of the rotary magazine calculated by the movement amount movement amount calculation means in the first invention. The supply timing determining means outputs a cleaning liquid supply start instruction signal to the cleaning liquid supply means, Zt, as a time required for the spindle head to move from the machining reference position to the replacement reference position. Ct is the ejection time difference from when the cleaning liquid is actually ejected from the cleaning nozzle to the reference when the spindle head starts moving from the processing reference position to the replacement reference position. A time when Zt + Mt−Ct has elapsed is determined as the supply start time.

  In general, even if a supply start instruction signal is output to the cleaning liquid supply means, the cleaning liquid is not immediately ejected from the cleaning nozzle, and is ejected from the cleaning nozzle with a certain response delay. For this reason, it is necessary to output the supply start instruction signal earlier by the ejection time difference Ct due to this response delay.

  As described above, when changing the tool, after the spindle head moves from the machining reference position to the exchange reference position, the magazine drive means rotates the rotary magazine in the circumferential direction, and the spindle head moves from the exchange reference position. The procedure is to move to the processing reference position. The machine tool of the fourth invention of the present application is provided with a rotation time calculation means, and this rotation time calculation means calculates the rotation drive time Mt of the rotary magazine. If the time required for the spindle head to move from the machining reference position to the replacement reference position is Zt, the elapsed time from the start of movement of the spindle head to the end of rotation of the rotary magazine is Zt + Mt.

  In the fourth invention of the present application, as the supply timing control of the cleaning liquid, the time Zt + Mt−Ct is obtained by adding Mt to Zt and further subtracting the ejection time difference Ct, based on the start of movement of the spindle head from the machining reference position to the replacement reference position. Is used. By waiting for the passage of Zt + Mt-Ct from the reference time and outputting a supply start instruction signal to the cleaning liquid supply means, the cleaning liquid is surely ejected from the cleaning nozzle to the tool at the timing when the rotation of the rotary magazine is completed. Can be made.

  According to the present invention, wasteful consumption of the cleaning liquid can be prevented.

It is a side view showing the whole machine tool composition of an embodiment of the present invention. It is a longitudinal cross-sectional view showing in detail the configuration of the Z-axis moving device and its periphery. It is a longitudinal cross-sectional view of the principal part of a tool magazine. It is D arrow line view of FIG. FIG. 4 is a view taken along arrow E in FIG. FIG. 3 is a view taken in the direction of arrow F in FIG. It is a front view of a tool holder. It is a top view of the grip arm holding the tool holder. It is a figure which expands and shows the circumference | surroundings of the spindle and tool magazine at the time of a tool exchange. It is a figure which shows notionally the structure of a washing | cleaning-liquid circuit. It is a figure explaining the relationship between the process of the tool replacement | exchange in the machine tool of embodiment, and ejection of a washing | cleaning liquid. It is a figure which represents notionally an example of the ejection start time table which memorize | stores the ejection start time corresponding to the number of magazine turning pitches. It is a block diagram showing the electric constitution of a machine tool. It is a flowchart showing the control procedure performed by a control part. In the modification which designates an ejection start time in a process, it is a figure explaining the calculation content of the process of a tool change in a machine tool, and an ejection start time.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a side view showing the overall configuration of the machine tool of the present embodiment. In FIG. 1, a machine tool 1 includes an XY axis moving device (not shown), a Z axis moving device (vertical moving mechanism) 5, a spindle driving device 20, an automatic tool changing device (tool changing mechanism) 2, and the like. Consists of. The XY axis moving device moves the table 135 holding the workpiece in the X direction and the Y direction perpendicular to each other. The table 135 is moved by an X-axis motor 131 (see FIG. 13) and a Y-axis motor 132 (see FIG. 13). The Z-axis moving device 5 moves the spindle 22 (spindle head 6) up and down. The main shaft driving device 20 rotationally drives the main shaft 22. The automatic tool changer 2 automatically transfers the tool holder 75 (see FIGS. 2 and 7 described later) to the main spindle 22. The machine tool 1 is integrally provided with a controller 9 that numerically controls the operations of the plurality of moving mechanisms and driving mechanisms.

  The automatic tool changer 2 includes a vertical column 3, a frame 4, a spindle head 6, a tool magazine (rotary magazine) 8, and the like. The frame 4 extends forward from the column 3 and supports the tool magazine. The spindle head 6 is reciprocated in the Z-axis direction by the Z-axis moving device 5. The tool magazine 8 is rotatably supported on the frame 4 via the magazine support 7.

  The machine tool 1 is provided with a storage tank 134 for storing a coolant liquid on the back side. The machine tool 1 has a storage tank 86 inside. The storage tank 86 stores the coolant liquid sucked from the storage tank 134 by the first pump 83 (see FIG. 10) as a cleaning liquid.

  FIG. 2 is a longitudinal sectional view showing in detail the configuration of the Z-axis moving device 5 and its surroundings. In FIG. 2, the column 3 includes a guide rail 11 in the vertical direction. The guide rail 11 is attached to the spindle head 6 via a pair of sliding pieces 12 so as to be movable up and down (Z-axis). The column 3 is provided with a rotatable ball screw 14 in parallel along the guide rail 11. The ball screw 14 is inserted while being screwed into a nut 13 fixed to the back surface of the spindle head 6. The ball screw 14 rotates in both forward and reverse directions by driving of the Z-axis motor 11 disposed on the upper portion of the column 3. The spindle head 6 moves in the vertical direction along the guide rail 11 via the ball screw 14 and the nut 13 by driving the Z-axis motor 11.

  The spindle head 6 includes a spindle 22 in the vertical direction so as to be rotatable. The main shaft 22 is connected to a main shaft motor 23 disposed above the main shaft head 6 via a coupling 24. The main shaft 22 is rotationally driven by a main shaft motor 23. The main shaft 22 has a tool mounting portion (tool engaging portion) 21 at its lower end.

  In the illustrated example, the tool mounting portion 21 can be fitted with a taper engaging portion 75a in a tool holder 75 having a cutting tool (tool) 74 mounted on the tip. The main shaft 22 has a holder clamping portion 25 above the tool mounting portion 21. The main shaft 22 has a draw bar 26 above the holder clamping portion 25. The draw bar 26 includes a spring, and the holder holding portion 25 always acts to clamp the pull stud 75 b provided at the tip end of the tool holder 75 attached to the tool attachment portion 21. The holder clamping unit 25 releases the clamp of the pull stud 75b by pressing the draw bar 26, and the tool holder 75 can be removed.

  The spindle head 6 includes a crank lever 28 that presses or releases the draw bar 26. The support shaft 27 supports a substantially L-shaped crank lever 28 in a swingable manner. The crank lever 28 includes a short lever 28a integrally formed in the horizontal direction and a long lever 28b integrally formed in the vertical direction. The distal end portion of the short lever 28 a can be engaged with a pin 29 that projects orthogonally to the draw bar 26.

  The long lever 28b fixes a plate cam 30 having an inclined surface. The plate cam 30 can be engaged with and disengaged from a cam follower 31 disposed in the Z-axis motor 15. The tension coil spring 32 is interposed between the long lever 28b and the spindle head 6, and always urges the crank lever 28 in the clockwise direction in the drawing. The tension coil spring 32 releases the pressing of the pin 29 by the short lever 28a.

  When the spindle head 6 is raised, the plate cam 30 provided on the crank lever 28 is engaged with the cam follower 31 located at the fixed position in the raising process. The engagement gives the crank lever 28 a counterclockwise movement in the drawing around the support shaft 27. Therefore, the short lever 28a presses the pin 29 downward, biases the holder holding portion 25 via the draw bar 26, and releases the clamp of the tool holder 75 from the pull stud 75b.

  Next, the tool magazine 8 will be described with reference to FIGS. The magazine support 7 supports a support shaft 35 which is adjacent to the tool change area of the spindle head 6 and which is oriented obliquely left frontward. The support shaft 35 rotatably supports a cylindrical magazine base 36 with a flange through a bearing 37. The magazine base 36 supports a plurality of grip arms 38 (21 in the example of the present embodiment) radially and swingably at equal intervals in the circumferential direction. The grip arm 38 has a tool holding portion 38A at the tip. 4, 5, and 6 show the magazine base 36 provided with ten grip arms 38 in the circumferential direction in order to avoid the complexity of illustration, but in the present embodiment, a cleaning liquid ejection start timing described later is provided. In the following description, it is assumed that 21 grip arms 38 are provided in the circumferential direction of the magazine base 36.

  The magazine base 36 has an indexing disc 39 centered on the support shaft 35 fixed by bolts 40. A plurality of roller-shaped cam followers 41 are provided on one side surface of the indexing disc 39 so as to correspond to the position where the grip arm 38 is disposed.

  Next, the drive system of the tool magazine 8 will be described with reference to FIGS. The magazine support 7 fixes a casing 45 that supports the magazine motor 46 to the front. The drive shaft 46 a of the magazine motor 46 is connected to a connecting shaft 47 via a coupling 48. The bevel gear 49 is fixed to the lower end portion of the connecting shaft 47. The bevel gear 49 meshes with a bevel gear 52 fixed to a rotating shaft 51 that is supported rotatably by the bearing 50. Based on the configuration described above, the magazine motor 46 rotates the rotary shaft 51.

  The rotating shaft 51 is provided with a barrel cam 53 at the center thereof. The barrel cam 53 has a cam groove 53a in which a linear portion and a required curve are drawn on the outer peripheral surface. The cam groove 53a can be sequentially fitted with each cam follower 41 radiatingly arranged on the indexing disc 39. The indexing disc 39 is intermittently indexed and rotated based on the rotation of the barrel cam 53.

  Next, the grip arm 38 will be described with reference to FIGS. The magazine base 36 fixes a plurality of clevises 56 (ten in the illustrated example to prevent complications) at a required central angle in a circumferential direction around the support shaft 35. Each clevis 56 supports a rod-like grip arm 38 via a support shaft 57 so as to be swingable.

  As shown in FIG. 4, a non-open / close type bifurcated portion 38 a that holds the tool holder 75 is formed at the outer peripheral side end portion of the grip arm 38. The bifurcated portion 38 a is set to a dimension that allows the V-groove 75 e provided around the outer diameter portion of the tool holder 75 to be clamped. A dead hole 38b is formed in each of the forked portions 38a in a direction perpendicular to the length direction of the grip arm 38.

  Each dead hole 38b accommodates a holding pin 60 urged by a coil spring 59 so as to be retractable, and the leading end of each holding pin 60 faces the inside of the two crotch portions. In other words, the tool holding portion 38A is configured by the bifurcated portion 38a and the pair of holding pins 60, and the plurality of tool holding portions 38A are arranged on the outer periphery of the magazine base 36.

  Accordingly, the pair of holding pins 60 are inserted into the V-groove 75e by aligning and pushing the V-groove 75e of the tool holder 75 with the bifurcated portion 38a of the grip arm 38. The pair of holding pins 60 holds the tool holder 75 in a state where the tool holder 75 is clamped from both sides by the spring force of the coil spring 59. Each outer end portion of the bifurcated portion 38a is provided with a first cam follower 61 that is rotatable about the center of the holding pin 60, respectively.

  As shown in FIG. 3, the end on the inner diameter side of the grip arm 38 has a dead hole 38c. The dead hole 38 c holds the steel ball 63 together with the coil spring 62. A part of the steel ball 63 protrudes from the opening of the dead hole 38c. A boss portion 36a of the magazine base 36 has a grip support collar 64 inserted thereon. The grip support collar 64 has a guide surface 64a whose longitudinal section is formed in an arc shape around the outer periphery. The steel ball 63 provided on the grip arm 38 can be elastically contacted with the guide surface 64a.

  The guide surface 64a has a notch groove 64b provided on the magazine base 36 side. The notch groove 64b holds the grip arm 38 by engaging the steel ball 63 of each grip arm 38 in the index standby state.

  As shown in FIG. 3, the grip arm 38 rotatably supports a second cam follower 65 formed in a roller shape at a position close to the support shaft 57. The second cam follower 65 can come into contact with a sloped movable cam surface formed on the movable cam body 66 (see FIG. 2).

  As shown in FIG. 1, the inclined umbrella-shaped front cover 70 covers the front sides of the plurality of grip arms 38. The plate-shaped rear cover 71 covers the rear side of the magazine base 36. The front cover 70 and the rear cover 71 prevent chips generated during cutting with the cutting tool 74 from entering the magazine base 36.

  When the spindle head 6 moves to the Z-axis origin position (see FIGS. 9 and 11 described later) during tool replacement, the grip arm 38 positioned at the lowermost end of the tool magazine 8 is a tool holder to which a used cutting tool 74 is attached. 75 is held. Thereafter, the crank lever 28 presses the draw bar 26 against the pull stud 75b of the tool holder 75 while the spindle head 6 is raised in the vertical direction to the ATC origin position (see FIGS. 9 and 11) which is the tool change position. Release the clamp. Since the grip holder 38 holds the tool holder 75 attached to the spindle 22, the tool holder 75 is extracted from the tool attachment portion 21 of the spindle head 6.

  Next, the magazine base 36 is rotated by the rotational drive of the magazine motor 46, and the grip arm 38 holding the tool holder 75 to which the cutting tool 74 used in the next cutting operation is attached is formed on the tool mounting portion 21 of the spindle head 6. Moves directly under and is positioned. This positioning movement of the grip arm 38 due to the rotation of the magazine base 36 is called an indexing operation. Thereafter, since the spindle head 6 moves downward in the vertical direction, the newly determined tool holder 75 is inserted into the tool mounting portion 21 of the spindle head 6 to complete the tool exchange. While the spindle head 6 is descending, the crank lever 28 interrupts the pressing of the draw bar 26 by the spring force of the tension coil spring 32. Therefore, the holder clamping unit 25 clamps the tool holder 75 inserted into the tool mounting unit 21.

  Next, the tool holder 75 will be described with reference to FIG. As shown in FIG. 7, the tool holder 75 includes a taper engagement portion 75a that is a main body portion, a pull stud 75b that is integrally formed with one end portion of the taper engagement portion 75a, and the other end of the taper engagement portion 75a. And a collet chuck 75d for mounting a cutting tool 74 (drilling drill in the illustrated example) integrally formed on the hook-shaped portion 75c. However, the hook-shaped portion 75c has an annular V-shaped groove 75e to be held by the grip arm 38, and a pair of key grooves 75f are recessed.

  As shown in FIG. 8, when the tool holder 75 is mounted, the key member 42 made of a small plate member that engages with the key groove 75f is fixed to the proximal end portion of the bifurcated portion 38a of the grip arm 38. ing. The distal end portion of the key member 42 partially protrudes from the proximal end portion of the bifurcated portion 38 a and can be engaged with the key groove 75 f of the tool holder 75.

  FIG. 9 is an enlarged longitudinal sectional view showing the periphery of the main shaft 22 and the tool magazine 8 at the time of tool change. In the state shown in FIG. 9, the spindle head 6 has moved to the most elevated position by the rotational drive of the Z-axis motor 15 (see FIG. 2). The tool holder 75 held by the grip arm 38 is located below the lower end surface of the spindle head 6. In this state, the lower end surface of the spindle head 6 is sufficiently separated from the upper end portion (pull stud 75b) of the tool holder 75. Therefore, the tool magazine 8 can be freely indexed without the tool holder 75 interfering with the main shaft 22. The position of the lower end surface of the spindle head 6 in such a state is referred to as an ATC origin (exchange reference position).

  From the state shown in the drawing, the spindle 22 is lowered by driving the Z-axis motor 15, and the lower end surface of the spindle head 6 is made to coincide with the upper end surface of the bowl-shaped portion 75 c of the tool holder 75, whereby the tool holder 75 is moved to the spindle 22. Can be attached. At this time, as described above, the holder holding portion 25 clamps the pull stud 75 b of the tool holder 75 inside the main shaft 22. The position of the lower end surface of the spindle head 6 in such a state is called the Z-axis origin (machining reference position).

  The spindle head 6 is provided with a plurality of cleaning nozzles 81 around its lower end surface and the opening portion of the tool mounting portion 21. The plurality of cleaning nozzles 81 are slightly below the cleaning liquid supplied from the cleaning liquid circuit 82 (cleaning mechanism; see FIG. 10 to be described later) below the opening of the tool mounting portion 21 (position of the taper engaging portion 75a in the illustrated state). Erupts towards

  FIG. 10 is a diagram conceptually showing the configuration of the cleaning liquid circuit 82. In FIG. 10, the coolant liquid that also serves as the cleaning liquid is sucked from the storage tank 134 by the first pump 83, discharged to the coolant supply passage 84, and sent to the cutting site. A branch passage 85 branched from the coolant supply passage 84 is connected to the lower end portion of the storage tank 86. The coolant liquid that has passed through the branch passage 85 is stored in the storage tank 86 as a cleaning liquid.

  The branch passage 85 includes a filter portion 87 for removing foreign matters mixed in the cleaning liquid, and a check valve 88 that allows only a flow in the direction of the storage tank 86 provided between the filter portion 87 and the storage tank 86. It is arranged.

  A cleaning liquid hose 89 that connects the lower end of the storage tank 86 and the cleaning nozzle 81 has a first switching valve 90. The first switching valve 90 can be switched between a valve closing position that closes the passage of the cleaning liquid hose 89 and a valve opening position that allows flow in the direction of the cleaning nozzle 81. The first switching valve 90 is normally biased by biasing means so as to be in the closed position.

  In the intermediate region in the vertical direction of the storage tank 86, there is provided a so-called depressurization exhaust passage 91 that opens into the processing chamber of the machine tool 1 and releases the pressure in the storage tank 86. The exhaust passage 91 is provided with a second switching valve 92 that can be switched between a valve closing position that blocks the passage and a valve opening position that enables flow in the direction of the processing chamber. The second switching valve 92 is normally biased by biasing means so as to be in the valve open position.

  In the example of this embodiment, a factory air source 93 is used for pressurizing the cleaning liquid. Since the factory air source 93 can obtain a sufficient discharge pressure, it does not require an air compressor or the like for separately pressurizing the cleaning liquid. One end of first to third air passages 94, 95, 96 is connected to the air source 93, respectively.

  The other end of the first air passage 94 is connected to the first electromagnetic valve 97. The first electromagnetic valve 97 can be electrically switched between a first position and a second position described later. The first position prohibits the air supply in the downstream direction of the first electromagnetic valve 97 and releases the pressure downstream of the first electromagnetic valve 97 to the atmosphere via the silencer 98. The second position supplies air in the downstream direction of the first electromagnetic valve 97.

  The first electromagnetic valve 97 is urged by the urging means so as to be in the first position in the off state. A fourth air passage 100 capable of supplying air from the air source 93 is connected downstream of the first electromagnetic valve 97 to the first switching valve 90 and a third switching valve 99 described later.

  The other end of the second air passage 95 is connected to the second electromagnetic valve 101. The second solenoid valve 101 can be electrically switched between a first position and a second position described later. The first position prohibits air supply in the downstream direction of the second solenoid valve 101 and releases the pressure downstream of the second solenoid valve 101 to the atmosphere via the silencer 102. The second position supplies air in the downstream direction of the second electromagnetic valve 101.

  The second solenoid valve 101 is biased by the biasing means so as to be in the first position in the off state. A fifth air passage 103 capable of supplying air from the air source 93 to the second switching valve 92 is connected downstream of the second electromagnetic valve 101.

  The other end of the third air passage 96 is connected to the upper end portion of the storage tank 86. The third air passage 96 includes a variable throttle valve 104, a third switching valve 99, and a check valve 105 that allows only air supply in the direction of the storage tank 86. The third switching valve 99 can be switched between a valve closing position that blocks the passage and a valve opening position that enables air supply in the direction of the storage tank 86 via a check valve. The third switching valve 99 is normally urged by the urging means so as to be in the closed position.

  The storage tank 86 includes a liquid level sensor 136 at a predetermined height from the lower end. The mounting height of the liquid level sensor 136 is such that when the remaining amount of the cleaning liquid is equal to or higher than the above height, the cleaning liquid is not interrupted even if the standard cleaning process is performed once, for example, for 5 seconds. It is installed in.

  The control unit 9 switches and controls the first electromagnetic valve 97 and the second electromagnetic valve 101 described above between the first position and the second position. When the cleaning liquid is ejected from the cleaning nozzle 81, the control unit 9 turns on the first electromagnetic valve 97 (actuates to a so-called second position) and turns on the second electromagnetic valve 101 (so-called second position). Operate. As a result of the first electromagnetic valve 97 being in the second position, the air of the air source 93 passes through the first electromagnetic valve 97 and flows into the fourth air passage 100. The air that flows to the first switching valve 90 side of the fourth air passage 100 compresses the urging means of the first switching valve 90 and switches the first switching valve 90 to the valve opening position. The air that has flowed to the third switching valve 99 side of the fourth air passage 100 compresses the urging means of the third switching valve 99 and switches the third switching valve 99 to the valve opening position. The pressurized air from the air source 93 passes through the variable throttle valve 104, the third switching valve 99, and the check valve 105 and is supplied into the storage tank 86.

  As a result of the second electromagnetic valve 101 being in the second position, the air from the air source 93 passes through the second electromagnetic valve 101 and flows into the fifth air passage 103. The air that has flowed into the fifth air passage 103 compresses the urging means of the second switching valve 92 and switches the second switching valve 92 to the closed position. The second switching valve 92 closes the exhaust passage 91. As a result, the air from the air source 93 supplied into the storage tank 86 pressurizes the cleaning liquid in the storage tank 86. The cleaning liquid stored in the storage tank 86 is ejected from the cleaning nozzle 81 vigorously by the pressure of air. When the control unit 9 detects that the remaining amount of the cleaning liquid stored in the storage tank 86 by the liquid level sensor 136 is not equal to or higher than the height, the control unit 9 operates that the filter unit 87 is clogged. Inform the person.

  In the cleaning liquid circuit 82 provided in the machine tool 1 of the present embodiment configured as described above, the first switching valve 90 that switches between supply and stop of the cleaning liquid to the cleaning valve 81 is a so-called pilot using air from the air source 93. The operation is controlled by the method. Therefore, even if the control unit 9 turns on the first solenoid valve 97 and the second solenoid valve 101, a predetermined response delay (hereinafter referred to as a cleaning liquid ejection time lag) until the cleaning liquid is actually ejected from the cleaning nozzle 81. ) Occurs.

  FIG. 11 is a diagram for explaining the relationship between the tool changing process in the machine tool 1 of the present embodiment and the ejection of the cleaning liquid.

  FIG. 11 shows an enlarged view of the periphery of the spindle 22 and the tool magazine 8 corresponding to FIG. 9 at four timings during the tool changing process. The timing (A) shown at the leftmost position indicates the timing when the lower end surface of the spindle head 6 is positioned at the Z-axis origin and the tool change is started. As shown in FIG. 8, the holding pin 60 of the tool holding portion 38 </ b> A protrudes and enters the V groove 75 e of the tool holder 75, and the tool holding portion 38 </ b> A completely holds the tool holder 75.

  In the period (B) next to the period (A), the spindle head 6 is raised by driving the Z-axis motor 15 from the state (A), and the lower end surface thereof rises from the Z-axis origin to the ATC origin ( 1). During this time, the holder clamping unit 25 releases the clamp of the tool holder 75 based on the operation of the crank lever 28.

  Time (C) next to time (B) is a state after passing through the index operation step (2) in which the tool magazine 8 is turned and the next tool to be used is arranged below the spindle head 6.

  In the example of the step (2) shown in the figure, an example in which a tool holder 75A having a tool (for example, a drill drill) removed from the spindle head 6 is replaced with a tool holder 75B having a tool to be used next (for example, a milling cutter). Is shown. In this example, the indexing operation of the tool magazine 8 is performed by turning the tool magazine 8 by a half turn in order to move the uppermost tool holder 75B to the index position below the spindle head 6. Note that the turning of the tool magazine 8 in this indexing operation is possible in both forward and reverse directions, and is usually turned in a direction with a small turning amount.

  The most right time (D) is a process in which the spindle head 6 is lowered by driving the Z-axis motor 15 from the time (C) when the indexing operation is completed, and the lower end surface thereof is lowered from the ATC origin to the Z-axis origin. It will be in the state which passed through (3). In the grip arm 38 at the indexing position (that is, the position below the spindle head 6), the tool holding portion 38A holds the tool holder 75 completely as in the time (A).

  Changes in time (A) to time (D) after these steps (1) to (3) are performed automatically and continuously. Among these, it is necessary to remove the chips adhering to the taper engaging portion 75a during the period (C) to the period (D) (that is, during the step (3)). In the step (3), the taper engagement portion 75a is exposed in a state where the tool holder 75B to be used next is arranged at the index position. The period between the period (C) and the period (D) (that is, during the step (3)) is the cleaning liquid ejection essential period.

  The position of the main shaft 22 in the Z-axis direction can be detected in real time by a rotary encoder (not particularly shown) linked to the Z-axis motor 15. The position of the main shaft 22 in the Z-axis direction is the same for each combination of time (A) and time (D), time (B) and time (C). The control unit 9 can accurately detect the respective times (A) to (D) from the flow of the change in the Z-axis direction position) and the flow of operations of the steps (1) to (4).

  FIG. 12 is a diagram conceptually illustrating an example of the ejection start time table that stores the ejection start time corresponding to the number of magazine turning pitches.

  An appropriate storage device (correlation storage means; for example, RAM 113 described later) provided in the control unit 9 stores and holds an ejection start time table. The ejection start time table is a magazine turning pitch number (rotary magazine) in which the required turning amount of the tool magazine 8 is expressed by the number of pitches (the turning amount of the grip arm 38 unit) in the indexing operation of the step (2) shown in FIG. ) And the ejection start time (supply start time) that is appropriate for starting the supply of the cleaning liquid to the cleaning nozzle 81. In the illustrated example, the ejection start timing table used in this embodiment in which 21 grip arms 38 are provided in the tool magazine 8 is shown, and the maximum value of the magazine turning pitch number is "10" "

  Of the number of magazine turning pitches set by the values “1” to “10”, “4” is set as the first reference value and “7” is set as the second reference value in the present embodiment. For the magazine turning pitch numbers “1” to “3” smaller than the first reference value “4”, the corresponding ejection start timing is set to the timing (A). Timing (A) is timing when the lower end surface of the spindle head 6 is positioned at the Z-axis origin and tool change is started. The magazine turning pitch numbers “4” to “7” that are equal to or larger than the first reference value “4” and equal to or smaller than the second reference value “7” set the corresponding ejection start timing as the timing (B). Time (B) is the timing when the lower end surface of the spindle head 6 has risen to the ATC origin. For magazine turning pitch numbers “8” to “10” that are larger than the seventh reference value “7”, the corresponding ejection start timing is set to time (C). Time (C) is the timing when the indexing operation by turning of the tool magazine 8 is completed.

  Next, the electrical configuration of the machine tool 1 will be described. As illustrated in FIG. 13, the control unit 9 includes a control circuit 110 and various drive circuits 121 to 128. The control circuit 110 controls a machining operation and a tool change operation of the machine tool 1 by executing a control program (see FIG. 14 described later) stored in a ROM 112 described later. The control circuit 110 basically includes a microcomputer including a CPU 111, a ROM 112, and a RAM 113, an input interface 114, and an output interface 115. The RAM 113 stores a processing program for performing desired processing on the machine tool 1 in addition to the ejection start time table described above. The machining program includes a plurality of operation blocks, and is created by an operator via an operation panel described later.

  The input interface 114 is electrically connected to a keyboard 130 of an operation panel (not shown) provided on the front surface of the machine tool 1. The output interface 115 includes a drive circuit 121 that drives the X-axis motor 131, a drive circuit 122 that drives the Y-axis motor 132, a drive circuit 123 that drives the Z-axis motor 15, and a drive circuit 124 that drives the spindle motor 23. A drive circuit 125 for driving the magazine motor 46, a drive circuit 126 for driving the first pump 83, a drive circuit 127 for driving the CRT 133 of the operation panel, and the first and second electromagnetic valves 97 and 101. A drive circuit 128 for driving is electrically connected to each other. The X-axis motor 131 includes an encoder 131a that detects the position of the table 135 in the X-axis direction. The encoder 131a is connected to the input interface 114. The Y-axis motor 132 includes an encoder 132a that detects the position of the table 135 in the Y-axis direction. The encoder 132a is connected to the input interface 114. The Z-axis motor 15 includes an encoder 6a that detects the position of the spindle head 6 in the Z-axis direction. The encoder 6a is connected to the input interface 114.

  FIG. 14 is a flowchart showing a control procedure executed by the control unit 9. This flow is started when the operator selects a desired machining program from the operation panel after the machine tool 1 is turned on and then presses an activation key (not shown) on the operation panel.

  In FIG. 14, first, in step S <b> 5, the CPU 111 reads one operation block constituting the machining program stored in the RAM 113 of the control circuit 110. The operation blocks are read in the order specified in advance.

  Next, the process moves to step S10, and the CPU 111 determines whether the instruction content of the operation block read in step S5 is the end of processing. When the instruction content of the read operation block is processing end (Yes in step S10), the CPU 111 ends this control. If the instruction content is not the end of processing (No in step S10), the CPU 111 moves the control to the next step S15.

  In step S15, the CPU 111 determines whether or not the instruction content of the operation block read in step S5 is an instruction for tool replacement. If the instruction content is not a tool change (No in step S15), the CPU 111 executes operation control according to the instruction content of the operation block in step S20, and then returns to step S5 and repeats the same procedure. When the instruction content of the read operation block is tool change (Yes in step S15), the CPU 111 moves the control to the next step S25.

  In step S25, the CPU 111 specifies the next tool to be used from the instruction content of the tool change operation block, and from the circumferential position of the next tool in the tool magazine 8 to the index position below the spindle head 6 at that time. The number of magazine turning pitches required to perform the indexing operation by turning 8 is calculated.

  Next, the CPU 111 obtains an appropriate ejection start timing corresponding to the number of magazine turning pitches calculated in step S25 from the ejection start timing table shown in FIG. 12 (step S30), and controls to the next step S35. Move.

  In step S35, the CPU 111 starts a tool change operation. Specifically, the CPU 111 controls the Z-axis motor 15 and the magazine motor 46 to automatically and continuously execute the operations of the steps (1) to (3) by multitask processing. While the tool changing operation is automatically performed, the CPU 111 moves the process to the next step S40.

  In step S40, the CPU 111 determines whether or not the ejection start timing acquired in step S30 has been reached. If the ejection start timing has not yet been reached (No in step S40), the CPU 111 repeats the same determination and waits for a loop. To do. When the ejection start timing has been reached (Yes in step S40), the CPU 111 outputs an ON operation control signal to the first electromagnetic valve 97 and the second electromagnetic valve 101 (step S45), and the process proceeds to step S50. The process of step S45 starts supplying the cleaning liquid to the cleaning nozzle 81. Whether or not the ejection start time has been reached is determined based on the position of the spindle head 6 obtained from the encoder 6a of the Z-axis motor 6 and whether or not the magazine motor 46 has already been driven. The timing (A) and the timing (D) are the same in the position of the spindle head 6, but at the timing (A), before the magazine motor 46 is driven, and at the timing (D), the magazine motor 46 is driven. Later. Similarly, the CPU 111 can distinguish time (B) from time (C).

  The CPU 111 determines whether or not the ejection stop timing has been reached, that is, whether or not the lower end surface of the spindle head 6 has been lowered to the Z-axis origin and the cleaning liquid is no longer ejected (step S50). If the ejection stop timing has not been reached (No in step S50), the CPU 111 repeats the same determination and waits in a loop. When the ejection stop timing has been reached (Yes in step S50), the CPU 111 outputs an off operation control signal to the first electromagnetic valve 97 and the second electromagnetic valve 101 to stop the ejection of the cleaning liquid (step S55). At this time, at the same time, the spindle 22 is in a state (D) when the tool holder 75 is completely held.

  Next, proceeding to step S60, the CPU 111 determines whether or not the spindle 22 has reached the machining standby position. At the machining standby position, the grip arm 38 at the indexing position at this time is rotated away from the spindle head 6 and the tool holder 75 is separated from the tool holding portion 38A. The machining standby position is usually a position below the Z-axis origin. If the spindle 22 has not yet reached the machining standby position (No in step S60), the CPU 111 repeats the same determination and waits in a loop. If the processing standby position has been reached (Yes in step S60), the CPU 111 moves the process to step S5 and repeats the same procedure.

  By performing the above control, when the number of magazine turning pitches in the tool change operation is relatively large from “8” to “10”, that is, when the time required for the indexing operation for turning the tool magazine 8 is relatively long. The ejection start operation can be performed at a later timing (C). Accordingly, the cleaning liquid can be reliably ejected within the above-described cleaning liquid ejection essential period, and the cleaning liquid ejection time is shortened compared to the case where the magazine turning pitch number is “1” to “7”, and the ejection is performed faster than necessary. Therefore, wasteful consumption of the cleaning liquid can be prevented.

  When the magazine turning pitch number is relatively small from “1” to “3”, that is, when the time required for the indexing operation for turning the tool magazine 8 is relatively short, the ejection start operation is performed at an earlier time (A). Can be done. Since the time required for the indexing operation is short, wasteful consumption of the cleaning liquid can be suppressed even if the ejection is started early. Since the cleaning liquid ejection time lag described above can be allowed to elapse between the process (1) and the process (2), the cleaning liquid can be ejected before the time (C) that is the start timing of the cleaning liquid ejection essential period. That is, the cleaning liquid can be ejected at a timing in consideration of the cleaning liquid ejection time lag.

  When the magazine turning pitch number is “4” to “7”, that is, when the time required for the indexing operation is medium, the ejection start operation can be performed at an earlier time (B). Since the time required for the indexing operation is medium, wasteful consumption of the cleaning liquid can be suppressed even if ejection is started early. Since the cleaning liquid ejection time lag described above can be allowed to elapse during the step (2), the cleaning liquid is ejected at a timing in consideration of the cleaning liquid ejection time lag, as in the case where the magazine turning pitch number is “1” to “3”. It can be performed.

  The magazine motor 46, the connecting shaft 47, the coupling 48, the bevel gears 49 and 50, the rotating shaft 51, the barrel cam 53 and the like constitute a magazine driving means. The first pump 83, the first switching valve 90, the second switching valve 92, the third switching valve 99, the air source 93, the first electromagnetic valve 97, and the second electromagnetic valve 101 constitute a cleaning liquid supply unit. The CPU 111 that executes the procedure of step S25 in the flowchart of FIG. 14 functions as a movement amount calculating unit, and the CPU 111 that executes the procedure of step S30 functions as a supply time determining unit.

  As described above, the machine tool 1 of the present embodiment has a movement amount necessary for the indexing operation of the tool magazine 8 at the time of tool change according to the circumferential position of the tool holder 75B holding the newly mounted tool. Calculate the magazine turning pitch. Based on the number of magazine turning pitches, the ejection start timing for starting the supply of the cleaning liquid is determined. When the ejection start time comes, the first pump 83, the first switching valve 90, the second switching valve 92, the third switching valve 99, the air source 93, the first electromagnetic valve 97, and the second electromagnetic valve 101 are cleaned nozzles. The supply of the cleaning liquid to 81 is started.

  When the circumferential position of the tool holder 75B holding the newly mounted tool 74 is far from the indexing position for delivering the tool, the swivel movement amount of the tool magazine 8 is large, and the rotational drive time becomes long. Decide on a later date. When the circumferential position of the tool holder 75B holding the newly mounted tool 74 is close to the indexing position for delivering the tool, the rotational movement time of the tool magazine 8 is small and the rotational drive time is shortened. Determine the start time early. When the tool is replaced, the cleaning liquid can be ejected at an appropriate timing immediately before the tool holder 75B is attached to the main shaft 22 regardless of the position of the tool holder 75B to which the new tool 74 is attached. As a result, wasteful consumption of the cleaning liquid can be prevented. Useless consumption of air and power can be prevented. Since the circulation amount of the cleaning liquid can be reduced, deterioration of the cleaning liquid itself can be suppressed.

  In this embodiment, in particular, the magazine turning pitch number and the ejection start timing are stored in advance as a correlation, and the procedure of step S30 determines the ejection start timing at which the supply of the cleaning liquid is started with reference to the correlation. Thereby, rough pattern division can be performed in advance, and supply start control of the cleaning liquid can be easily performed by a simple method based on the pattern division.

  Particularly in this embodiment, when the magazine turning pitch number is “1” to “3” and the turning movement amount of the tool magazine 8 is small, the rotational drive time is short, so that the spindle head 6 moves from the Z-axis origin to the ATC origin. At the time (A) when the movement starts, the supply of the cleaning liquid to the cleaning nozzle 81 is started early. Accordingly, the cleaning liquid can be surely ejected before the new tool 74 is attached to the main shaft 22. When the magazine turning pitch number is “8” to “10” and the turning movement amount of the tool magazine 8 is large, the rotation drive time is long, and therefore the spindle head 6 starts to return from the ATC origin to the Z-axis origin ( In C), the supply of the cleaning liquid to the cleaning nozzle 81 is started. Thereby, it is possible to prevent waste due to the ejection of the cleaning liquid more quickly than necessary. When the magazine turning pitch number is “4” to “7” and the turning movement amount of the tool magazine 8 is medium, the time when the tool magazine 8 starts to rotate between the above two cases (B ), Supply of the cleaning liquid to the cleaning nozzle 81 is started.

  As described above, regardless of the position of the tool holder 75B to which the new tool 74 is attached, the cleaning liquid can be surely ejected at an appropriate timing immediately before the tool is attached to the main shaft 22.

  The present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit and technical idea of the present invention. Hereinafter, such modifications will be described.

(1) When designating the ejection start time during the process In the machine tool 1 of the above embodiment, the three times (A) to (C) that are appropriate for the number of magazine turning pitches required for the indexing operation. Supply of the cleaning liquid is started at any timing. Therefore, in consideration of the cleaning liquid ejection time lag and the like, it is not always possible to actually start ejection of the cleaning liquid from the cleaning nozzle 81 at the timing (C) itself, which is the start timing of the cleaning liquid ejection essential period. . This modification corresponds to this, and during the step (1) of raising the main shaft 22 so as to actually start the ejection of the cleaning liquid from the cleaning nozzle 81 at the timing of the timing (C), or the indexing operation step (2). In the middle of this, the ejection start time is specified.

  FIG. 15 is a diagram for explaining the tool replacement process and the calculation content of the ejection start time in the machine tool 1 of the present modification, and corresponds to FIG. 11 in the above embodiment.

  In FIG. 15, the time required for the step (1) for shifting from time (A) to time (B) is that the spindle head 6 is raised by driving the Z-axis motor 15 and its lower end surface is moved from the Z-axis origin. This is the Z-axis movement time Zt required to raise the ATC origin. The time required for the step (2) for shifting from the time (B) to the time (C) is the time required for the indexing operation of the tool magazine 8, that is, the time required for turning the tool magazine 8 by one pitch. The magazine turning time Mt (= Pt × Pn), which is the product of Pt and the calculated magazine turning pitch number Pn.

  Thus, the time is started from the time (A) when the tool change operation is started, and the time (C) is reached when the total time (= Zt + Mt) of the Z-axis movement time Zt and the magazine turning time Mt has elapsed. In order to actually start the ejection of the cleaning liquid from the cleaning nozzle 81 when this time (C) is reached, the first electromagnetic valve 97 and the second electromagnetic valve 97 and the second are moved back by the above-described cleaning liquid ejection time lag Ct (ejection time difference Ct). A control signal (supply start instruction signal) for turning on the solenoid valve 101 may be output. In other words, when the timing is started from the timing (A), when (Zt + Mt) −Ct has elapsed, the first solenoid valve 97 and the second solenoid valve 101 are turned on, and the timing is reached when the timing (C) is reached. Then, the ejection of the cleaning liquid from the cleaning nozzle 81 can be started.

  In this case, the Z-axis movement time Zt and the cleaning liquid ejection time lag Ct are respectively determined in advance, and the number of magazine turning pitches (calculated in step S25) in the procedure of step S30 in the flowchart of FIG. 14 in the above embodiment. The magazine turning time Mt based on the above is calculated, and the time of (Zt + Mt) −Ct is calculated using it. Time measurement is started when the tool change operation is started at the time of step S35 (reference time), and it is only necessary to determine whether or not (Zt + Mt) −Ct has elapsed in step S40. As described above, it is possible to actually start the ejection of the cleaning liquid from the cleaning nozzle 81 when the time (C) is reached without referring to the ejection start timing table.

  In the above, the magazine turning time Mt corresponds to the rotational driving time Mt of the rotary magazine, and the Z-axis movement time Zt corresponds to the required time Zt for the spindle head to move from the machining reference position to the replacement reference position. In addition, the procedure of step S30 described in the modification functions as a rotation time calculation unit.

  As described above, in this modification, the magazine turning time Mt is calculated, and together with the Z-axis movement time Zt, the elapsed time from the start of movement of the spindle head 6 to the end of rotation of the tool magazine 8 is Zt + Mt. Is calculated. Based on the start of movement of the spindle head 6 from the Z-axis origin to the ATC origin (that is, time (A)), the time Zt + Mt−Ct obtained by adding Mt to Zt and further subtracting the cleaning liquid ejection time lag Ct is the cleaning liquid supply timing. It is determined as a certain eruption start time. The timing when the rotation of the tool magazine 8 is completed by outputting a control signal for turning on the first electromagnetic valve 97 and the second electromagnetic valve 101 after waiting for the passage of Zt + Mt−Ct from the reference time ( The cleaning liquid can be reliably ejected from the cleaning nozzle 81 at the timing C).

  The operation timing for stopping the ejection of the cleaning liquid may be set by the same method. That is, the time required for the step (3) for shifting from the timing (C) to the timing (D) is calculated as the Z-axis return movement time Rt, and the time (Zt + Mt + Rt) −Ct has elapsed from the timing (A). By outputting a control signal for turning off the first electromagnetic valve 97 at the time, the actual ejection of the cleaning liquid from the cleaning nozzle 81 can be stopped at the timing (D).

1 Machine tool 2 Automatic tool changer (tool changer)
5 Z-axis movement device (vertical movement mechanism)
6 Spindle head 8 Tool magazine (Rotary magazine)
15 Z-axis motor 21 Tool mounting part (tool engaging part)
22 Spindle 23 Spindle motor 38 Grip arm 38A Tool holder 46 Magazine motor (magazine drive means)
47 Connecting shaft (magazine drive means)
48 Coupling (magazine drive means)
49, 50 Bevel gear (magazine drive means)
51 Rotating shaft (magazine drive means)
53 Barrel cam (magazine drive means)
74 Cutting tool (tool)
75, 75A, 75B Tool holder 81 Cleaning nozzle 82 Cleaning liquid circuit (cleaning mechanism)
83 First pump (cleaning liquid supply means)
90 1st switching valve (cleaning liquid supply means)
92 Second switching valve (cleaning liquid supply means)
99 3rd switching valve (cleaning liquid supply means)
93 Air source (cleaning liquid supply means)
97 1st solenoid valve (cleaning liquid supply means)
101 Second solenoid valve (cleaning liquid supply means)
113 RAM (correlation storage means)

Claims (4)

A spindle head that rotatably supports a spindle having a tool engaging portion that holds a tool; and
An up-and-down movement mechanism capable of positioning the spindle head in a vertical direction, and a positioning reference position serving as a positioning reference when cutting with the tool, and a replacement reference position serving as a positioning reference when replacing the tool;
A rotary magazine having tool holders for holding a tool holder to which the tool is attached at a plurality of locations in the circumferential direction, and the rotary magazine rotated in the circumferential direction when the spindle head is located at the replacement reference position. Magazine driving means for driving, while the spindle head moves from the machining reference position to the replacement reference position, the tool engaging portion of the spindle and the tool holding portion of the rotary magazine A tool change mechanism capable of delivering the tool between,
A cleaning nozzle for ejecting a cleaning liquid for cleaning a tool to be newly mounted on the tool engaging portion of the main spindle, and a cleaning liquid supply means for supplying the cleaning liquid to the cleaning nozzle when the tool is changed by the tool changing mechanism; In a machine tool equipped with a cleaning mechanism having
The amount of movement of the rotary magazine by the magazine driving means during tool change is calculated according to the circumferential position of the rotary magazine in the rotary magazine of the tool holder holding a tool to be newly mounted on the tool engaging portion of the spindle Movement amount calculation means for
Supply time determining means for determining the supply start time of the cleaning liquid to the cleaning nozzle by the cleaning liquid supply means based on the movement amount calculated by the movement amount calculating means;
The cleaning liquid supply means includes
A machine tool, wherein a cleaning liquid is supplied to the cleaning nozzle at the supply start time determined by the supply time determination means. The machine tool according to claim 1,
Correlation storage means for storing a predetermined correlation between the amount of movement of the rotary magazine and the supply start time of the cleaning liquid,
The supply time determining means includes
The machine tool characterized in that the supply start time is determined with reference to the correlation stored in the correlation storage unit based on the movement amount calculated by the movement amount calculation unit. In the machine tool according to claim 1 or claim 2,
The supply time determining means includes
When the amount of movement is smaller than the first reference value, the time when the spindle head starts moving from the machining reference position to the replacement reference position is the supply start time,
When the movement amount is larger than the second reference value, the rotation start of the rotary magazine is finished, and the time when the spindle head starts moving from the replacement reference position to the machining reference position is set as the supply start time. ,
When the movement amount is not less than the first reference value and not more than the second reference value, the rotary magazine starts to rotate after the spindle head has finished moving from the machining reference position to the replacement reference position. A machine tool characterized in that time is set as the supply start time. The machine tool according to claim 1,
A rotation time calculation unit that calculates a rotation drive time Mt of the rotary magazine corresponding to the movement amount of the rotary magazine calculated by the movement amount movement amount calculation unit;
The supply time determining means includes
The time required for the spindle head to move from the machining reference position to the replacement reference position is Zt,
A jet time difference from when the cleaning liquid supply start instruction signal is output to the cleaning liquid supply means until the cleaning liquid is actually jetted from the cleaning nozzle is represented by Ct,
When
When the spindle head starts moving from the machining reference position to the replacement reference position, the reference time Zt + Mt−Ct
A machine tool characterized in that the time when only the time has elapsed is determined as the supply start time.

Images