JP2014180730A - Machine tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a machine tool allowing a tool to be properly attached to a shrinkage fitting holder fixed to a main shaft at a low cost.SOLUTION: The machine tool comprises: a tool delivering device that delivers a tool between a shrinkage fitting holder and a tool magazine fixed to a main shaft which can be vertically moved; and a heating device that heats the shrinkage fitting holder and opens the shrinkage fitting holder. The tool delivering device is configured to deliver the tool between the shrinkage fitting device and the delivering device at a tool delivery position where the main shaft is descended. The heating device has a heating portion that descends together with the shrinkage fitting holder while heating the shrinkage fitting holder descending in association with the descending of the main shaft in at least part of the descending process of the main shaft.

Description

  The present invention relates to a machine tool, and more particularly to a machine tool that can automatically change a tool to a shrink-fit holder fixed to a main shaft that is movable in a vertical direction.

  Patent Document 1 describes a machine tool including a transfer arm that transfers a tool between a spindle and a tool magazine. In this machine tool, a concave holder is provided at the tip of the main shaft, while a convex holder is provided at the support portion of the tool. Then, in a state where the concave holder of the main shaft is heated and the inner diameter is enlarged, the tool is transported toward the main shaft by the transport arm, and the convex holder of the tool is fitted to the concave holder of the main shaft. After that, the concave holder of the main shaft is cooled and closed, so that the tool is attached to the main shaft. In addition, in Patent Document 1, when a device that applies fine vibration to one of the holders is provided, the convex portion holder and the concave portion holder can be smoothly fitted and removed. It is described.

  Patent Document 2 describes a machine tool including a tool gripping device that conveys a tool between a shrink-fit holder fixed to a main shaft and a tool magazine. In this machine tool, after the shrink-fit holder is heated and opened, the tool gripped by the tool gripping device is inserted into the shrink-fit holder and accurately positioned by movement control of the tool gripping device. The tool is attached to the shrink-fit holder by cooling and closing the shrink-fit holder.

  Patent Document 3 describes a machine tool including a tool conveying device that conveys a tool between a shrink-fit holder fixed to a main shaft and a tool magazine, and a suction device that sucks air from within the shrink-fit holder. Has been. In this machine tool, with the shrink-fit holder heated and released, the tool held by the tool transport device is transported to the tool delivery position facing the shrink-fit holder, and then the suction fit holder is placed inside the shrink-fit holder by the suction device. As the air is sucked from the tool, the tool held by the tool conveying device is sucked up into the shrink-fit holder, and then the shrink-fit holder is cooled and closed, so that the tool is attached to the spindle. It has become.

Japanese Patent No. 2912401 Japanese Patent No. 4163020 Japanese Patent No. 4410175

  However, according to the knowledge of the present inventors, in the machine tool described in Patent Document 1, even when the concave holder is heated and the inner diameter is enlarged, the concave holder and the convex holder The gap is only a few μm. Therefore, it is necessary that the positioning accuracy of the transfer arm is sufficient. If the positioning accuracy of the transfer arm is insufficient, there is a device that applies a slight vibration to one of the holders in order to smoothly engage and disengage, as employed in the technique of Patent Document 1. It becomes essential and the cost becomes high.

  Also, in the machine tool described in Patent Document 2, the gap between the shrink-fit holder and the tool is only a few μm in a state where the shrink-fit holder is heated and opened. Therefore, in order to smoothly insert the tool into the shrink fit holder, it is necessary that the positioning accuracy of the tool gripping device is sufficient. And in order to implement | achieve sufficient positioning accuracy, as the technique of patent document 2 is employ | adopted, the highly accurate positioning and axis movement apparatus of several micrometers or less are additionally employ | adopted as a tool holding device, for example. It is necessary and the cost becomes high.

  On the other hand, the machine tool described in Patent Document 3 employs a configuration in which a tool is sucked with respect to the shrink-fit holder. Therefore, when air is sucked by the suction device, dust such as cutting waste may be sucked together. Such dust becomes an obstacle, and there is a problem that the tool cannot enter a predetermined position or a misalignment occurs between the tool and the shrink-fit holder.

  The present invention has been created based on the above findings. An object of the present invention is to provide a machine tool capable of accurately attaching a tool to a shrink-fit holder fixed to a main shaft at low cost.

  The present invention relates to a tool delivery device for delivering a tool between a shrink fit holder and a tool magazine fixed to a spindle movable in the vertical direction, and heating for heating the shrink fit holder to open the shrink fit holder. And the tool delivery device delivers a tool to and from the shrink-fit holder at a tool delivery position where the spindle is lowered, and the heating device lowers the spindle. In at least a part of the stroke, the machine tool is characterized by having a heating unit that moves down together with the shrink-fit holder while heating the shrink-fit holder that descends as the main shaft descends.

  According to the present invention, the spindle can be accurately lowered toward the tool delivery position by utilizing the high-precision positioning and axis moving device for the spindle that is originally provided in the machine tool. During the lowering of the main shaft, the shrink-fit holder fixed to the main shaft can be immediately heated and opened by the heating unit of the heating device that moves down together with the shrink-fit holder. Therefore, when the tool is held by the tool delivery device at the tool delivery position, the tool is smoothly and quickly inserted into the shrink-fit holder that descends as the spindle is lowered. Then, the shrink fitting holder fixed to the main shaft is accurately positioned at the tool delivery position, so that the tool can be accurately positioned within the shrink fitting holder. Thereby, it becomes possible to attach a tool correctly with respect to the shrink-fit holder fixed to the main axis | shaft at low cost.

  Preferably, the heating unit has a contact portion that contacts the housing of the main shaft while descending together with the main shaft. According to such an aspect, after the main shaft housing comes into contact with the contact portion of the heating portion while the main shaft is lowered, the contact portion of the heating portion faces downward from the housing of the main shaft as the main shaft is lowered. Since it is pushed, the heating unit can be easily lowered together with the shrink-fit holder fixed to the main shaft.

  More preferably, the heating device includes a support frame supported by the main body of the machine tool, and a heating unit support member that elastically supports the heating unit with respect to the support frame. According to such an aspect, when the contact portion of the heating unit is pushed downward from the housing of the main shaft while the main shaft is lowered, the housing of the main shaft is moved from the contact portion of the heating unit by the elastic force of the heating unit support member. Since an upward resistance force is applied to the heating portion, the contact portion of the heating portion is prevented from being separated from the housing of the main shaft, and the relative positional relationship between the heating portion and the shrink-fit holder can be maintained constant. Thereby, the heating efficiency of the shrink-fit holder by the heating unit can also be maintained constant.

  Specifically, for example, the heating unit support member is an air cylinder.

  Alternatively, the heating unit support member may be a spring.

  More preferably, the support frame is provided with a cooling passage through which air flows, and a cooling nozzle that communicates with the cooling passage and ejects air toward the shrink-fit holder, and the heating device Is configured as a heating and cooling device. According to such an aspect, the shrink-fit holder can be cooled by the air ejected from the cooling nozzle, so that the open shrink-fit holder can be quickly closed.

  Preferably, the heating device includes an arm member that is turned around a vertical rotation axis by a rotation drive mechanism, and the heating unit is mounted on the arm member. According to such an aspect, even when the main shaft and the tool magazine are arranged at different positions in plan view, the arm member is mounted on the arm member by turning around the vertical rotation axis. The heating unit can be moved horizontally between the spindle and the tool magazine.

  Further preferably, the tool delivery device is also mounted on the arm member. According to such an aspect, even when the main shaft and the tool magazine are arranged at different positions in plan view, the arm member is mounted on the arm member by turning around the vertical rotation axis. The tool delivery device can also be moved horizontally between the spindle and the tool magazine.

  Specifically, the machine tool having any one of the above features further includes, for example, a spindle control unit that controls the rotation and movement of the spindle, and a table on which a workpiece is placed.

  Further, the present invention is a heating and cooling device installed in a machine tool having a shrink fit holder fixed to a main shaft movable in a vertical direction, and at least a part of the lowering process of the main shaft, While heating the shrink fitting holder that descends as it descends, the heating unit descends together with the shrink fitting holder, a support frame supported by the main body of the machine tool, and the heating unit with respect to the support frame. A heating portion supporting member that elastically supports, a cooling passage through which air flows, and a cooling nozzle that is communicated with the cooling passage and ejects air toward the shrink-fit holder. And a heating / cooling device.

  According to the present invention, while the main shaft is lowered, the shrink-fit holder fixed to the main shaft can be immediately heated and opened by the heating unit of the heating device that is lowered together with the shrink-fit holder. Here, when the abutting portion of the heating portion is brought into contact with the housing of the main shaft while the main shaft is descending, an upward resistance force is exerted on the housing of the main shaft from the abutting portion of the heating portion by the elastic force of the heating portion support member. Therefore, the contact portion of the heating unit is prevented from being separated from the housing of the main shaft, and the relative positional relationship between the heating unit and the shrink-fit holder can be maintained constant. Thereby, the heating efficiency of the shrink-fit holder by the heating unit can also be maintained constant. Moreover, since the shrink fit holder can be cooled by the air ejected from the cooling nozzle, the open shrink fit holder can be quickly closed.

  According to the present invention, the spindle can be accurately lowered toward the tool delivery position by utilizing the high-precision positioning and axis moving device for the spindle that is originally provided in the machine tool. During the lowering of the main shaft, the shrink-fit holder fixed to the main shaft can be immediately heated and opened by the heating unit of the heating device that moves down together with the shrink-fit holder. Therefore, when the tool is held by the tool delivery device at the tool delivery position, the tool is smoothly and quickly inserted into the shrink-fit holder that descends as the spindle is lowered. Then, the shrink fitting holder fixed to the main shaft is accurately positioned at the tool delivery position, so that the tool can be accurately positioned within the shrink fitting holder. As a result, the tool can be accurately attached to the shrink-fit holder fixed to the main shaft at low cost.

1 is a schematic perspective view of a machine tool according to an embodiment of the present invention. It is a schematic perspective view which expands and shows the tool delivery apparatus and heating apparatus with which the machine tool of FIG. 1 is provided. In the machine tool of FIG. 1, it is a schematic diagram for demonstrating the process in which the 2nd tool hold | maintained at the tool magazine is delivered to a tool delivery apparatus. In the machine tool of FIG. 1, while a tool delivery apparatus is moved to a tool delivery position, it is a schematic diagram for demonstrating the process by which a main axis | shaft is moved to the upper position corresponding to a tool delivery position. In the machine tool of FIG. 1, it is a schematic diagram for demonstrating the process which the housing of a main axis | shaft contacts the contact part of a heating part during the fall of a main axis | shaft. In the machine tool of FIG. 1, it is a schematic diagram for demonstrating the process in which the 1st tool hold | maintained at the shrink-fitting holder is inserted in a tool delivery apparatus. In the machine tool of FIG. 1, it is a schematic diagram for demonstrating the process by which a 1st tool is extracted from a shrink-fit holder. In the machine tool of FIG. 1, it is a schematic diagram for demonstrating the process in which the 1st tool and 2nd tool currently hold | maintained at the tool delivery apparatus reverse each other's position and attitude | position upside down. In the machine tool of FIG. 1, it is a schematic diagram for demonstrating the process in which the 2nd tool hold | maintained at the tool delivery apparatus is inserted in a shrink-fit holder. In the machine tool of FIG. 1, it is a schematic diagram for demonstrating the process in which the 2nd tool is extracted from a tool delivery apparatus. In the machine tool of FIG. 1, it is a schematic diagram for demonstrating the process in which the 1st tool hold | maintained at the tool delivery apparatus is delivered to a tool magazine.

  Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

  FIG. 1 is a schematic perspective view of a machine tool according to an embodiment of the present invention, and FIG. 2 is an enlarged schematic perspective view showing a tool delivery device provided in the machine tool.

  As shown in FIG. 1, a machine tool 10 according to the present embodiment includes a spindle 11 that can move in the vertical direction, a spindle control unit (control panel) 17 that controls the rotation and movement of the spindle 11, and a workpiece. And a table 18 to be placed. A shrink-fit holder 12 that holds the tool 15 is attached to the main shaft 11. The tool 15 held by the shrink-fit holder 12 is a tool having a tool diameter of 4 mm or less, for example.

  In the present embodiment, the main shaft 11 is movable in the horizontal X direction, while the table 18 is movable in the horizontal Y direction perpendicular to the X direction. The spindle control unit 17 controls the rotation and movement of the spindle 11 and the table 18 is moved in the horizontal Y direction, so that the tool 15 held in the shrink-fit holder 12 is moved to a desired position on the table 18. It is possible to move relatively. As a result, the workpiece placed on the table 18 is processed into a desired shape by the rotating tool 15.

  In FIG. 1, a tool magazine 13 in which a plurality of spare tools 15 are set is arranged outside the table 18. That is, in the present embodiment, the main shaft 11 and the tool magazine 13 are arranged at different positions in plan view.

  As shown in FIG. 1, the machine tool 10 according to this embodiment includes a tool delivery device 20 that delivers a tool 15 between a shrink-fit holder 12 fixed to a main shaft 11 movable in a vertical direction and a tool magazine 13. And a heating device 30 that heats the shrink-fit holder 12 and opens the shrink-fit holder 12. The tool delivery device 20 delivers the tool 15 to and from the shrink-fit holder 12 at the tool delivery position where the main shaft 11 is lowered. Further, the heating device 30 includes a heating unit 31 that moves down with the shrink-fit holder 12 while heating the shrink-fit holder 12 that is lowered as the main shaft 11 is lowered in at least a part of the lowering process of the main shaft 11. doing.

  Specifically, the main body of the heating unit 31 is an annular electromagnetic induction heating coil. Commercially available products sold as combinations corresponding to each other can be used for the shrink-fit holder 12 and the main body of the heating unit 31.

  FIG. 2 is a schematic perspective view showing the tool delivery device 20 and the heating device 30 in an enlarged manner.

  As shown in FIG. 2, in the present embodiment, the heating device 30 includes a support frame 41 supported by the main body of the machine tool 10, and heating that elastically supports the heating unit 31 with respect to the support frame 41. Part support member 33.

  Specifically, as shown in FIG. 2, the support frame 41 has a flat plate shape and is horizontally supported by the main body of the machine tool 10 via an arm member 34 described later. The support frame 41 is provided with a through hole 44 coaxially with the main body of the heating unit 31.

  On the other hand, the heating unit support member 33 is specifically an air cylinder. The air cylinder 33 is erected at two locations on the support frame 41 with the through hole 44 interposed therebetween. The heating unit 31 is fixed to the rod portion of the air cylinder 33 via the flange member 39. The air cylinder 33 is configured to maintain a constant pressure inside. Therefore, the heating unit 31 is elastically supported on the support frame 41 by the pressure of the air in the air cylinder 33.

  In addition, bushes 37 are installed and fixed at a total of four locations on the support frame 41 so as to surround the through-holes 44, and the four shafts 36 inserted into the bushes 37 so as to be movable up and down. The upper end portion is also fixed to the flange member 39 of the heating unit 31. The four shafts 36 are provided so as to always stabilize the posture of the heating unit 31 during the descending (and ascending) by being linearly guided by the corresponding bushes 37.

  As shown in FIG. 3, the support frame 41 of the present embodiment includes a cooling passage 42 through which air flows, and a cooling nozzle 43 that communicates with the cooling passage 42 and ejects air toward the shrink-fit holder 12. And are provided. The cooling passage 42 is provided in an annular shape so as to surround the through hole 44 inside the support frame 41, and is connected to a cooling air supply unit (not shown). On the other hand, a plurality of cooling nozzles 43 are provided substantially uniformly in the circumferential direction from the cooling passage 42, each obliquely upward, and the tip of each cooling nozzle 43 is exposed on the inner peripheral surface of the through hole 44. . When air is supplied from the cooling air supply unit into the cooling passage 42, the supplied air flows into each cooling nozzle 43 through the cooling passage 42, and obliquely enters the through hole 44 from the tip of each cooling nozzle 43. It is designed to be ejected upward. Thereby, when the shrink-fitting holder 12 is positioned close to the through hole 44 of the support frame 41, the shrink-fitting holder 12 is cooled by the air ejected from each cooling nozzle 43.

  That is, in the present embodiment, the heating device 30 is configured as a heating / cooling device that heats and cools the shrink-fit holder 12.

  As shown in FIGS. 1 and 2, the heating device 30 includes an arm member 34 that is turned around a vertical rotation axis by a rotation drive mechanism 38. Specifically, the rotation drive mechanism 38 is an air cylinder.

  In the present embodiment, as shown in FIG. 2, the arm member 34 has a pair of upper and lower horizontal elongated members 34 a and 34 b. The main body of the machine tool 10 is provided with a first shaft 35a coaxially with a vertical rotation axis, and the base end portions of the pair of upper and lower elongated members 34a and 34b are rotatable about the first shaft 35a, respectively. It is supported. On the other hand, the tip ends of the pair of upper and lower elongated members 34a and 34b are connected to each other via a vertical second shaft 35b.

  And the above-mentioned support frame 41 is being fixed to the front-end | tip part of the elongate member 34a of an upper side. That is, the heating unit 31 supported on the support frame 41 is mounted on the arm member 34 via the support frame 41.

  On the other hand, an elevating mechanism 25 is installed on the elongated member 34 b on the lower side, and the tool delivery device 20 is connected to a linear output portion of the elevating mechanism 25 via a connecting member 29. That is, the tool delivery device 20 is also mounted on the arm member 34 via the lifting mechanism 25.

  Specifically, the lifting mechanism 25 is an air cylinder. When the linear output portion of the lifting mechanism 25 is linearly driven, the tool delivery device 20 is linearly moved in the vertical direction together with the connection member 29.

  As shown in FIG. 2, the tool delivery device 20 specifically includes a second rotation driving mechanism 24 that rotates the rotation output unit 26 around a horizontal rotation axis, and a hand support coupled to the rotation output unit 26. Part 23, a first hand 21a that can be opened and closed supported by the hand support part 23, and a door that can be opened and closed that is supported by the hand support part 23 in an axially symmetric position and orientation with respect to the first hand 21a with respect to the horizontal rotation axis. Second hand 21b.

  Specifically, the second rotation drive mechanism 24 is an air actuator. When the rotation output unit 26 is driven to rotate 180 ° around the horizontal rotation axis, the first hand 21a and the second hand 21b supported by the hand support unit 23 are turned upside down symmetrically with respect to the horizontal rotation axis. It has become so.

  Specifically, the first hand 21a and the second hand 21b are known parallel open / close type air chucks, and are disposed in opposition to each other and can be moved relative to each other by air pressure. 22a (or 22b). When the pair of movable members 22a (or 22b) are brought close to each other, the tool 15 positioned between the pair of movable members 22a (or 22b) is sandwiched and gripped by the pair of movable members 22a (or 22b). It has come to be. On the other hand, when the pair of movable members 22a (or 22b) are separated from each other, the tool 15 held between the pair of movable members 22a (or 22b) is released.

  Also, as shown in FIG. 2, when the tool delivery device 20 is raised by the lifting mechanism 25, a pair of movable members 22a (or 22b) of the hand located on the upper side of the first hand 21a and the second hand 21b. Passes through the inside of the through hole 44 provided in the support frame 41 and protrudes above the support frame 41.

  Next, with respect to the operation of the present embodiment as described above, the first tool 15a fixed in the shrink-fit holder 12 is replaced with the second tool 15b set in the tool magazine 13 with reference to FIGS. The process of exchanging with will be described as an example.

  As shown in FIG. 3, the second tool 15 b set in the tool magazine 13 with the cutting edge directed upward in a state where the tool delivery device 20 is disposed at an upper position of the tool magazine 13 includes the tool magazine. By the operation 13, the tool is properly positioned at a predetermined position for delivering the tool to the tool delivery device 20.

  Next, in a state where the second hand 21b of the tool delivery device 20 is opened, the tool delivery device 20 is lowered by the elevating mechanism 25 and is stopped by a known stopper (not shown) at a predetermined height position. At this time, at least a part of the second tool 15b set in the tool magazine 13 is inserted between the pair of movable members 22b of the second hand 21b. Then, the second hand 21b is closed, and the second tool 15b inserted between the pair of movable members 22b is gripped by the second hand 21b. Subsequently, in a state where the second tool 15 b is gripped by the second hand 21 b, the tool delivery device 20 is raised by the lifting mechanism 25, and the second tool 15 b is removed from the tool magazine 13. The tool delivery device 20 that is ascending is not shown in a height position such that the pair of movable members 22a of the first hand 21a passes through the through holes 44 of the support frame 41 and protrudes above the support frame 41. It is stopped by a known stopper.

  Next, as shown in FIG. 4, the tool delivery device 20 is turned around the vertical rotation axis together with the heating device 30 by the rotation drive mechanism 38, and a tool for delivering the tool to the shrink-fit holder 12. It is stopped at a delivery position by a known stopper (not shown). On the other hand, the spindle 11 is horizontally moved by the spindle controller 17 and is accurately positioned at an upper position corresponding to the tool delivery position.

  Next, as shown in FIG. 5, the main shaft 11 is lowered together with the shrink-fit holder 12, the housing of the main shaft 11 is brought into contact with the contact portion 32 of the heating device 30, and the shrink-fit holder 12 is brought into contact with the heating portion. 31 is inserted. Then, heating of the shrink-fit holder 12 by the heating unit 31 is started.

  Next, as shown in FIG. 6, the spindle 11 is further lowered together with the shrink-fit holder 12 by the spindle controller 17 in a state where the heating of the shrink-fit holder 12 by the heating part 31 is continued. As the main shaft 11 is lowered, the contact portion 32 of the heating unit 31 is pushed downward from the housing of the main shaft 11, so that the heating unit 31 is easily lowered together with the shrink-fit holder 12 fixed to the main shaft 11.

  In the present embodiment, when the contact portion 32 of the heating unit 31 is pushed downward from the housing of the main shaft 11 while the main shaft 11 is being lowered, the elastic force of the air cylinder 33 causes the contact portion 32 of the heating unit 31 to move away from the contact portion 32. An upward resistance force is applied to the housing of the main shaft 11. For this reason, it is prevented that the contact part 32 of the heating part 31 is separated from the housing of the main shaft 11, and the relative positional relationship between the heating part 31 and the shrink-fit holder 12 is maintained constant. Thereby, the heating efficiency of the shrink fitting holder 12 by the heating part 31 is also maintained constant.

  The spindle 11 is stopped at a predetermined height position by the spindle controller 17. At this time, at least a part of the first tool 15a fixed to the shrink-fit holder 12 is inserted between the pair of movable members 22a opened in the first hand 21a. Then, the first hand 21a is closed, and the first tool 15a inserted between the pair of movable members 22a is gripped by the first hand 21a. Then, the shrink-fit holder 12 is opened by the heating of the heating unit 31.

  Next, as shown in FIG. 7, the spindle 11 is lifted together with the shrink-fit holder 12 by the spindle control unit 17 in a state where the first tool 15 a is gripped by the first hand 21 a, and from inside the shrink-fit holder 12. The first tool 15a is removed.

  Next, as shown in FIG. 8, after the tool delivery device 20 is lowered by the lifting mechanism 25 and the first tool 15 a gripped by the first hand 21 a is moved to a position below the support frame 41, the second By the rotation drive mechanism 24, the first hand 21a and the second hand 21b supported by the hand support portion 23 are turned upside down symmetrically about the horizontal rotation axis.

  Next, as shown in FIG. 9, the tool delivery device 20 is raised by the elevating mechanism 25, and the pair of movable members 22 b of the second hand 21 b passes through the through holes 44 of the support frame 41 and above the support frame 41. It is stopped by a known stopper (not shown) at such a height that it protrudes to the side. On the other hand, the spindle 11 is lowered together with the shrink-fit holder 12 by the spindle controller 17. The second tool 15b held by the second hand 21b is smoothly and quickly inserted into the shrink-fitting holder 12 that descends as the main shaft 11 descends. Then, the spindle 11 is accurately positioned at the tool delivery position by the spindle control unit 17, whereby the second tool 15 b is accurately positioned in the shrink-fit holder 12.

  The heating of the shrink-fitting holder 12 by the heating unit 31 is stopped, and the ejection of air from each cooling nozzle 43 is started. The ejected air flows toward the shrink-fit holder 12, and the shrink-fit holder 12 is cooled. Thereby, the shrink-fitting holder 12 in an open state can be quickly closed.

  When the shrink-fit holder 12 is closed, the second tool 15 b is fixed to the shrink-fit holder 12.

  Next, as shown in FIG. 10, with the second hand 21b opened, the spindle 11 is raised together with the shrink-fit holder 12 by the spindle control unit 17, and the second tool 15b is removed from the second hand 21b. It is pulled out.

  Next, as shown in FIG. 11, the tool delivery device 20 is swung around the vertical rotation axis together with the heating device 30 by the rotation drive mechanism 38, and a known stopper (not shown) is positioned above the tool magazine 13. Quiesced. On the other hand, by the operation of the tool magazine 13, the hollow pod on which the first tool 15 a is to be set is appropriately positioned at a predetermined position for delivering the tool to the tool delivery device 20. Then, the tool delivery device 20 is lowered by the lifting mechanism 25 and is stopped at a predetermined height position by a known stopper (not shown). At this time, the first tool 15 a gripped by the first hand 21 a is appropriately set in the hollow pod of the tool magazine 13.

  Thereafter, with the first hand 21a opened, the tool delivery device 20 is raised by the lifting mechanism 25, and the first tool 15a is removed from the first hand 21a.

  According to the present embodiment as described above, the spindle 11 is brought to the tool delivery position by using the spindle control unit 17 which is a high-precision positioning and axis moving device for the spindle that is originally provided in the machine tool. It can be accurately lowered. During the lowering of the main shaft 11, the shrink fitting holder 12 fixed to the main shaft 11 can be immediately heated and released by the heating unit 31 of the heating device 30 that moves down together with the shrink fitting holder 12. Therefore, when the second tool 15b is held by the tool delivery device 20 at the tool delivery position, the second tool 15b is smoothly and quickly inserted into the shrink-fit holder 12 that descends as the spindle 11 descends. It will be done. And the said 2nd tool 15b can be correctly positioned in the said shrink-fit holder 12 by the said spindle 11 being correctly positioned in a tool delivery position. As a result, the second tool 15b can be accurately attached to the shrink-fit holder 12 fixed to the main shaft 11 at low cost.

  Further, according to the present embodiment, after the housing of the main shaft 11 comes into contact with the contact portion 32 of the heating unit 31 while the main shaft 11 is lowered, the heating unit 31 comes into contact with the lowering of the main shaft 11. Since the part 32 is pushed downward from the housing of the main shaft 11, the heating unit 31 can be easily lowered together with the shrink-fit holder 12 fixed to the main shaft 11.

  Furthermore, according to the present embodiment, when the contact portion 32 of the heating unit 31 is pushed downward from the housing of the main shaft 11 while the main shaft 11 is being lowered, the heating unit 31 is caused by the elastic force of the heating unit support member 33. Since an upward resistance force is applied to the housing of the main shaft 11 from the contact portion 32 of the main shaft 11, the contact portion 32 of the heating portion 31 is prevented from being separated from the housing of the main shaft 11, and the heating portion 31 and the shrink-fit holder 12 are The relative positional relationship can be kept constant. Thereby, the heating efficiency of the shrink-fit holder 12 by the heating part 31 can also be maintained constant.

  Further, according to the present embodiment, the shrink-fit holder 12 can be cooled by the air ejected from the cooling nozzle 43, so that the open-fit holder 12 can be quickly closed.

  Further, according to the present embodiment, even if the main shaft 11 and the tool magazine 13 are arranged at different positions in plan view, the arm member 34 is turned around the vertical rotation axis, so that the arm member 34 The mounted heating unit 31 can be moved horizontally between the spindle 11 and the tool magazine 13.

  Furthermore, according to the present embodiment, even if the main shaft 11 and the tool magazine 13 are arranged at different positions in plan view, the arm member 34 is swung around the vertical rotation axis, so that the arm member 34 The mounted tool delivery device 20 can also be moved horizontally between the spindle 11 and the tool magazine 13.

  In the present embodiment, the heating unit support member 33 is an air cylinder, but is not limited thereto, and the heating unit support member 33 may be a spring.

DESCRIPTION OF SYMBOLS 10 Machine tool 11 Main axis | shaft 12 Shrink fitting holder 13 Tool magazine 15 Tool 15a 1st tool 15b 2nd tool 16a 1st tool pod 16b 2nd tool pod 17 Main axis | shaft control part 18 Table 20 Tool delivery apparatus 21a 1st hand 21b 2nd hand 22a a pair of movable members 22b a pair of movable members 23 a hand support portion 24 a second rotation drive mechanism 25 a lifting mechanism 26 a rotation output portion 30 a heating device 31 a heating portion 32 a contact portion 33 a heating portion support portion 34 a pair of arm members 34a and 34b Elongated member 35a First shaft 35b Second shaft 36 Shaft 37 Bush 38 Rotation drive mechanism 39 Flange member 41 Support frame 42 Cooling passage 43 Cooling nozzle 44 Through hole

Claims (10)

A tool delivery device for delivering a tool between a shrink-fit holder fixed to a spindle movable in the vertical direction and a tool magazine;
A heating device that heats the shrink-fit holder and opens the shrink-fit holder;
With
The tool delivery device delivers a tool to and from the shrink-fit holder at the tool delivery position where the spindle is lowered,
The heating device has a heating section that lowers with the shrink fitting holder while heating the shrink fitting holder that descends as the spindle lowers in at least a part of the descending stroke of the spindle. A featured machine tool. The machine tool according to claim 1, wherein the heating unit includes a contact portion that contacts the housing of the main shaft while descending together with the main shaft. The heating device includes a support frame supported by a main body of the machine tool, and a heating unit support member that elastically supports the heating unit with respect to the support frame. The machine tool according to claim 2. The machine tool according to claim 3, wherein the heating unit support member is an air cylinder. The machine tool according to claim 3, wherein the heating unit support member is a spring. The support frame is provided with a cooling passage through which air flows, and a cooling nozzle that communicates with the cooling passage and ejects air toward the shrink-fit holder,
The machine tool according to claim 3, wherein the heating device is configured as a heating / cooling device. The heating device has an arm member that is turned around a vertical rotation axis by a rotation drive mechanism,
The machine tool according to claim 1, wherein the heating unit is mounted on the arm member. The machine tool according to claim 7, wherein the tool delivery device is also mounted on the arm member. A spindle control unit for controlling rotation and movement of the spindle;
A table on which the workpiece is placed;
The machine tool according to claim 1, further comprising: A heating / cooling device installed in a machine tool having a shrink-fit holder fixed to a main shaft movable in a vertical direction,
A heating unit that lowers with the shrink-fit holder while heating the shrink-fit holder that descends as the main shaft descends in at least a part of the lowering process of the main shaft;
A support frame supported by the main body of the machine tool;
A heating unit support member that elastically supports the heating unit with respect to the support frame;
With
The support frame is provided with a cooling passage through which air flows and a cooling nozzle that communicates with the cooling passage and ejects air toward the shrink-fit holder. .

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