Machine tool with trunnion table

Abstract

The present invention provides a machine tool equipped with a trunnion table that can efficiently wash away chips that accumulate around the workpiece and the trunnion table after machining on the machine tool. [Solution] In a machine tool 10 having a trunnion table 40, the trunnion table 40 comprises a trunnion base 44 having an outer circumference concave shape in plan view, which is configured to move linearly and includes a left leg portion 52a and a right leg portion 52b that rotatably support the left and right sides of the cradle 42 with bearings, a beam member 48 that connects these on the front side, and a space portion 50 that communicates with the center trough 70 on the rear side, a servo motor 62 that rotates the cradle 42, and coolant nozzles 66a and 66b arranged on the beam member 48 that discharge cleaning coolant CT toward the workpiece W.

Description

[Technical Field]

[0001] This invention relates to a machine tool having a trunnion table. [Background technology]

[0002] Generally, chips that accumulate on a workpiece after machining are cleaned in the workpiece setup room or outside the machine tool. However, this type of cleaning, including the removal of the chips after cleaning, makes the process complicated and increases the number of work hours. For this reason, Patent Document 1 discloses a machine tool configured to remove chips accumulated on a workpiece, comprising a 5-axis vertical machining center with a spindle configured to move along the X, Y, and Z axis directions, and a table mounted on the bed, to which a pallet with a workpiece placed on its upper surface is attached, and which is configured to rotate freely around a rotation center axis parallel to the Y axis (horizontal axis) (B axis direction). According to this machine tool, after the completion of a series of machining operations, the workpiece is turned upside down by rotating the table in the B axis direction, and the chips accumulated on the workpiece are removed by coolant discharged from a nozzle located on the bed toward the workpiece. Furthermore, the chips can be dropped through chip discharge holes formed in the bed to a conveyor belt of a chip discharge device and transported outside the machine.

[0003] However, in order to thoroughly clean the chips accumulated on the workpiece, it becomes necessary to rotate the table and change the relative position of the table and nozzle while cleaning. However, if the relative position of the table and the chip discharge hole does not change, the chips sprayed with coolant may not fall directly into the discharge hole but accumulate on the side walls of the bed or on the stepped parts of the cover. Therefore, work is required to clean up the chips that have scattered outside the discharge hole. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2006-334682 [Overview of the Initiative] [Problems that the invention aims to solve]

[0005] In view of the above circumstances, the present invention aims to provide a machine tool having a trunnion table that can efficiently wash away chips that accumulate around the workpiece and the trunnion table after processing on the machine tool. [Means for solving the problem]

[0006] One aspect of the present invention is a machine tool having a trunnion table for mounting a workpiece to be machined by a tool attached to the spindle, the trunnion table comprising: a bed having a trough formed along the front-rear direction for receiving and guiding chips and coolant out of the machine; a spindle unit arranged on a column erected on the rear side of the bed and configured to be movable along a linear feed axis in the left-right direction and a linear feed axis in the up-down direction; and a trunnion table having a cradle with a workpiece mounting base, the trunnion table being arranged across the trough such that the central axis of the tilting oscillating feed axis of the cradle is perpendicular to the longitudinal direction of the trough, and configured to be movable along a linear feed axis in the front-rear direction that is perpendicular to the linear feed axis in the left-right direction and the linear feed axis in the up-down direction, wherein the trunnion table mounts a workpiece to be machined by a tool attached to the spindle unit, the trunnion table is The trunnion base is characterized by comprising: a trunnion base having an outer circumference concave shape in plan view, which engages with guide rails arranged along the front-rear direction on both the left and right sides of the trough, is configured to be able to move linearly along the front-rear direction, and has left and right legs that rotatably support both the left and right sides of the cradle with bearings, a beam member connecting the lower side of the left leg and the lower side of the right leg on the front side, and a space that communicates with the trough on the rear side, and having an outer circumference concave shape in plan view; an inclined oscillating drive device that rotates the cradle along an inclined oscillating feed axis and changes the orientation of the workpiece mounting surface of the workpiece mounting table from at least horizontally upward to horizontally downward; and a coolant nozzle arranged on the beam member of the trunnion base that discharges cleaning coolant diagonally upward and rearward. [Effects of the Invention]

[0007] According to a machine tool having a trunnion table according to one aspect of the present invention, the trunnion table includes a trunnion base having left and right legs that engage with guide rails arranged on the bed along the front-rear direction on both the left and right sides of the trough, are configured to move linearly along the front-rear direction, and rotatably support the left and right sides of the tilting oscillating feed shaft with bearings. The trunnion base also includes a beam member connecting the lower side of the left leg and the lower side of the right leg on the front side, and a space that communicates with the trough on the rear side. As a result, the outer shape of the trunnion base is formed in a concave shape in plan view. Furthermore, the trunnion table includes a coolant nozzle arranged on the beam member of the trunnion base above the trough, which discharges cleaning coolant diagonally upward and rearward. By rotating the cradle with the tilting oscillating drive device and changing the orientation of the workpiece mounting table toward the rear side where the space is formed, the workpiece, workpiece mounting table, and cradle can be positioned in the upper region of the space formed behind the coolant nozzle located on the beam member. Therefore, the cleaning coolant discharged from the coolant nozzle diagonally upward and backward hits the workpiece, workpiece mounting base, and cradle, and together with the chips, passes through the concave space and falls directly into the connecting trough. Furthermore, the trunnion table can be moved forward as needed to increase the area of ​​the trough that receives the chips. In this way, the chips sprayed with cleaning coolant can be prevented from falling off the space and trough and falling to other places on the bed or to stepped parts of the cover. As a result, on the machine tool, chips that accumulate around the workpiece and trunnion table after machining can be dropped directly into the trough without scattering to other places, improving the efficiency of chip recovery and efficiently washing away chips from the workpiece. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 shows an external perspective view of the machine tool according to this embodiment. [Figure 2]Figure 2 shows a perspective view of the machine tool as seen when it is cut along the line II-II in Figure 1. [Figure 3] Figure 3 shows a partial plan view of a machine tool having a trunnion table according to this embodiment. [Figure 4] Figure 4 shows a perspective view of the trunnion table according to this embodiment. [Figure 5A] Figure 5A shows a perspective view of a trunnion table with its workpiece mounting surface facing forward and upward towards the machine tool (A=45 degrees). [Figure 5B] Figure 5B shows a perspective view of a trunnion table with its orientation changed so that the workpiece mounting surface of the workpiece mounting base is facing upwards (A=0 degrees). [Figure 5C] Figure 5C shows a perspective view of a trunnion table whose orientation has been changed so that the workpiece mounting surface of the workpiece mounting base is aligned in the vertical direction (A = -90 degrees). [Figure 5D] Figure 5D shows a perspective view of a trunnion table with its workpiece mounting surface facing forward and downward towards the machine tool (A = -195 degrees). [Modes for carrying out the invention]

[0009] The machine tool having a trunnion table according to the embodiment will be described below with reference to the attached drawings. Similar or corresponding elements are denoted by the same reference numerals, and redundant explanations are omitted. The scale of the drawings may be changed in the explanation to facilitate understanding.

[0010] Figure 1 shows an external perspective view of a machine tool 10 having a trunnion table 40 according to this embodiment. Figure 2 shows an internal perspective view of the machine tool 10 as seen from the boundary between the workpiece setup section 12 and the machining chamber 36. For this reason, the splash guard 18, operator door 20, rear cover 16, and stairs 22 are omitted from Figure 2. The machine tool 10 comprises a workpiece setup section 12 where a pallet exchange device (both not shown) is located to exchange the workpiece mounting base 54 of the trunnion table 40 (to which the workpiece W (see Figure 4) is attached) with a setup stocker, and a machining center 14 for machining. Between the workpiece setup section 12 and the machining center 14, there is a machining chamber 36 with space for machining the workpiece by a tool (not shown) attached to (gripped) by the spindle device 34 of the machining center 14. The workpiece setup section 12 and the machining chamber 36 are separated by a swivel cover (not shown) that is rotatable (swivelable) around a pivot axis parallel to the vertical direction (Y-axis direction). The machine tool 10's exterior consists of a rear cover 16 that covers the machining center 14 and a splash guard 18 that covers the machining chamber 36 to prevent the scattering of chips (not shown) generated during machining.

[0011] A staircase 22 is located on the side of the splash guard 18, allowing the operator to ascend and descend to access the processing chamber 36. On the processing chamber 36 side (inward in the left-right direction) of the staircase 22, a step 24 is provided for the operator to step onto when accessing the processing chamber 36. The upper surface of the step 24 is attached to the bed 26 so as to overlap it in a plan view. The upper surface of the step 24 is formed as a flat plate extending horizontally, and is configured to be continuous and flush with the upper surface of the top step of the staircase 22. An opening (not shown) for the operator to enter and exit is formed on the side of the splash guard 18, and an operator door 20 is provided that is movable (slidable) in the front-rear direction (Z-axis direction) to open and close the opening.

[0012] The machine tool 10 is equipped with a bed 26 placed on the floor of a factory or the like where it is installed. A column 28 is erected on the upper surface of the rear part 26b of the bed 26 on the Z-axis rear side, and is movable along a second linear feed axis in the left-right direction (X-axis direction). A spindle unit 34 is located on the front side of the column 28, and the spindle unit 34 is configured to move linearly relative to the column 28 along a third linear feed axis in the up-down direction (Y-axis direction). For this reason, the rear part 26b of the bed and the column 28 are equipped with an X-axis feed device for moving the spindle unit 34 along the X-axis direction and a Y-axis feed device for moving it along the Y-axis direction (neither of which are shown in the figure). In addition, at the boundary between the front part 26a of the bed 26 and the rear part 26b of the bed 26, retractable left and right telescopic covers 30 and upper and lower telescopic covers 32 are arranged to cover the front side of the column 28 in order to prevent chips generated by machining from scattering towards the rear part 26b of the bed 26. Alternatively, a column 28 may be fixed to the rear 26b of the bed, and the spindle unit 34 may be positioned to move linearly in the X-axis and Y-axis directions relative to the column 28.

[0013] Guide rails 60 are positioned on both the left-right (X-axis direction) sides of the upper surface of the front part 26a of the bed, extending along the front-rear direction (Z-axis direction) perpendicular to the X-axis and Y-axis directions. A trunnion table 40 is positioned above the guide rails 60. Trunnion base legs 52, consisting of a left leg 52a and a right leg 52b, are formed on both the left-right sides of the lower end of the trunnion table 40. The left leg 52a and the right leg 52b are engaged with the guide rails 60 via a carriage 58. The carriage 58 is configured to move the trunnion table 40 linearly along a first linear feed axis in the front-rear direction (Z-axis direction). Therefore, a workpiece attached to the trunnion table 40 moving along the first linear feed axis can be moved relative to a tool held by the spindle unit 34 moving along the second and third linear feed axes to process the workpiece.

[0014] Further, a center trough 70 as a groove-shaped trough is formed along the front-rear direction (Z-axis direction) at the center of the bed 26 between the guide rails 60 to which the trunnion base legs 52 are attached. Therefore, chips washed away by the cleaning coolant CT (both shown in FIG. 4) discharged from the coolant nozzles 66a and 66b and the discharged cleaning coolant CT can be dropped into and received (collected) by the center trough 70. As a result, as will be described later, chips deposited on the workpiece W after processing and the trunnion base 44 can be collected, and the dischargeability of the chips and the cleaning coolant CT to the outside of the machine tool 10 can be improved. Further, the cleaning coolant discharged from a coolant nozzle (not shown) installed on the ceiling of the spindle device 34 or the splash guard 18 also flows into the center trough 70 together with the chips.

[0015] FIG. 3 shows a plan view of the machining center 14 and the trunnion table 40. The trunnion table 40 includes a trunnion base 44 having trunnion base legs 52 and arranged so as to straddle the center trough 70, and a cradle 42 arranged inside the trunnion base 44 and configured to be swingable along a first rotary feed shaft A as an inclined swing feed shaft.

[0016] The first rotary feed shaft A has its central axis O A arranged along the left-right direction (X-axis direction) perpendicular to the longitudinal direction of the center trough 70, that is, the front-rear direction (Z-axis direction). The left and right ends of the cradle 42 that rotates along the first rotary feed shaft A are rotatably supported by bearings by the left leg 52a and the right leg 52b. Further, a servo motor 62 as an inclined swing drive device for swinging the cradle 42 supported by bearings is built in the left leg 52a. Therefore, the left leg 52a is formed larger than the right leg 52b. As a result, the machine tool 10 can operate the servo motor 62 to swing the cradle 42 along the first rotary feed shaft A.

[0017] In the center of the cradle 42 is a workpiece mounting base 54 having a workpiece mounting surface 56 on its upper side for mounting a workpiece W (see Figure 4). A T-groove 56a is formed in the workpiece mounting surface 56 of the workpiece mounting base 54. The workpiece mounting base 54 is configured to rotate relative to the cradle 42, and when the workpiece mounting surface 56 on which the workpiece W is mounted is facing upward, the workpiece mounting base 54 rotates around a central axis perpendicular to the workpiece mounting surface 56, in this case, a central axis perpendicular to the left-right direction (X-axis direction) and the front-back direction (Z-axis direction). B It can be rotated along the second rotary feed axis B that rotates around it. Here, the workpiece mounting table 54 is described as being configured to swing together with the cradle 42 along the first rotary feed axis A and to rotate along the second rotary feed axis B, but it is not limited to this configuration, and the workpiece mounting table may be configured to swing only along the first rotary feed axis A.

[0018] The trunnion base 44 is positioned to straddle the center trough 70 along the left-right direction (X-axis direction), and has a beam member 48 integrally formed with it, connecting the lower sides of the left leg 52a and the right leg 52b on the forward side in the Z-axis direction. The Z-axis forward end of the beam member 48 is formed flush with the front surfaces of the left leg 52a and the right leg 52b. Therefore, the front end of the trunnion base 44 is formed in a straight line along the left-right direction (X-axis direction) in a plan view. Furthermore, on the Z-axis rear side of the beam member 48, an inclined surface 48b is formed that slopes downward towards the rear side, i.e., towards the column 28 and the spindle device 34. The rear end of the inclined surface 48b is the rear end 48a of the beam member, and the rear end 48a of the beam member is on the central axis O of the first rotary feed shaft A. AAt approximately the same front-to-back position, it is formed in a straight line that straddles the center trough 70 along the left-to-right direction (X-axis direction). Furthermore, the rear end 48a of the beam member is formed to be located further forward in the Z-axis direction than the rear ends of the left leg 52a and the right leg 52b, and a space 50 that communicates with the center trough 70 is formed in the area enclosed by the rear end of the left leg 52a, the rear end of the right leg 52b and the beam member 48. The outer periphery of the trunnion base 44 configured in this way is formed in a concave shape in plan view (the outer shape enclosed by the thick straight line and dotted line in Figure 3) by the left leg 52a, the right leg 52b, the beam member 48 and the space 50. Furthermore, because the trunnion base 44 has a servo motor installed in the left leg 52a, the left leg 52a is formed to be larger in the X-axis direction compared to the right leg 52b. In addition, the left leg 52a, the right leg 52b, and the beam member 48 are integrally connected, which plays a role in ensuring the rigidity of the trunnion base 44 and enabling it to handle heavy workpieces.

[0019] Furthermore, the inner ends of the left leg portion 52a and the right leg portion 52b are formed along the front-to-back direction (Z-axis direction), and are formed at the same positions as the left-to-right (X-axis direction) ends of the center trough 70 which is formed along the front-to-back direction. Therefore, the left end portion 50a and the right end portion 50b, which are the left-to-right ends of the space portion 50, are formed in positions that communicate with the left and right ends of the space formed within the center trough 70.

[0020] As shown in Figure 3, the workpiece mounting base 54, which is positioned on the cradle 42 connected to the trunnion base 44, is aligned with the central axis O of the second rotary feed axis B when the workpiece mounting surface 56 is horizontally upward. B The position is the central axis O of the first rotational feed axis A. A The cradle 42 is positioned so as to be located forward by a predetermined offset length D1 from the position. Therefore, when the machine tool 10 operates the servo motor 62 and rotates and oscillates (changes posture) the cradle 42 along the first rotary feed axis A so that the workpiece mounting table 54 faces the column 28 and spindle device 34, a large portion of the workpiece mounting table 54 and the workpiece W attached thereto are aligned with the central axis O of the first rotary feed axis A. AIt can be positioned further back than the position indicated by the space 50, that is, towards the space 50. This allows the chips accumulated on the workpiece W and workpiece mounting base 54 after processing to fall directly from the space 50 into the space within the center trough 70.

[0021] Figure 4 shows a perspective view of the trunnion table 40 in a state where the cradle 42 has been rotated to change the orientation of the workpiece mounting surface 56 of the workpiece mounting base 54, to which the workpiece W is attached, to a horizontal downward position. The workpiece W shown in Figure 4 is schematically represented by a dashed line as the maximum outer circumference shape of the workpiece W that can be attached to the workpiece mounting base 54 according to this embodiment. The trunnion table 40 is positioned above the center trough 70 and below the inclined surface 48b of the beam member 48 of the trunnion base 44, and has a coolant nozzle 66a that discharges cleaning coolant CT diagonally upward and backward toward the workpiece mounting base 54 and the workpiece W. The direction in which the coolant nozzle 66a discharges is recommended to be diagonally upward and backward, but is not limited to this. The trunnion table 40 also has coolant nozzles 66b positioned above the left leg portion 52a and the right leg portion 52b. The diagram of the cleaning coolant CT shown in Figure 4 is a schematic representation of an example of the discharge range of the cleaning coolant CT discharged from the coolant nozzles 66a and 66b, and is not limited thereto. The cleaning coolant CT may be discharged over a wider discharge range by adjusting the coolant nozzles 66a and 66b.

[0022] Figures 5A to 5D exemplify perspective views of the workpiece W and workpiece mounting table 54 after their orientation has been changed by rotating the cradle 42 along the first rotary feed axis A. Here, the state in which the workpiece mounting surface 56 of the workpiece mounting table 54 shown in Figure 5B is facing upward is defined as inclination angle A = 0 degrees. The cradle 42 of the machine tool 10 is configured to change the orientation of the workpiece mounting table 54 from the state in which the workpiece mounting surface 56 of the workpiece mounting table 54 is facing forward and upward towards the machine tool 10 (inclination angle A = 45 degrees) as shown in Figure 5A, through the state in which the workpiece mounting surface 56 is aligned in the vertical direction as shown in Figure 5C (inclination angle A = -90 degrees), to the state in which the workpiece mounting surface 56 is facing forward and downward towards the machine tool 10 as shown in Figure 5D (inclination angle A = -195 degrees). Therefore, not only can the cradle 42 be changed to accommodate machining at various inclination angles, but by rotating the cradle 42 along the first rotary feed axis A and discharging cleaning coolant CT from various angles toward the workpiece W and workpiece mounting table 54 which are inclined (changed in orientation) toward the space section 50, chips accumulated on the workpiece W and workpiece mounting table 54 can be washed away and dropped into the center trough 70. Furthermore, by changing the orientation of the workpiece W and workpiece mounting table 54 to any inclination angle, cleaning coolant CT can also be discharged from the coolant nozzles 66a and 66b into the gap SP1 (see Figure 4) that occurs at the connection part between the cradle 42 and the workpiece mounting table 54. This suppresses or prevents chips from scattering outside the center trough 70, and allows the chips to fall into the center trough 70, thereby improving the efficiency of chip recovery. However, the cradle may be configured to change the orientation of the workpiece mounting surface from horizontal upward to horizontal downward (tilt angle A = 0 degrees to -180 degrees), and is not limited to this configuration.

[0023] The effects and advantages of the machine tool 10 having the trunnion table 40 according to this embodiment are described below.

[0024] In the machine tool 10 having the trunnion table 40 according to this embodiment, the trunnion base 44 is arranged to straddle the center trough 70 along the left-right direction (X-axis direction), and has a beam member 48 that is integrally formed with the lower side of the left leg portion 52a and the lower side of the right leg portion 52b on the forward side in the Z-axis direction. Furthermore, an inclined surface 48b is formed on the rear side in the Z-axis direction of the beam member 48, which slopes downward toward the column 28 and the spindle device 34. The rear end of the inclined surface 48b is the rear end 48a of the beam member, and the rear end 48a of the beam member is on the central axis O of the first rotary feed axis A. A At approximately the same front-to-back position, it is formed in a straight line that straddles the center trough 70 along the left-to-right direction (X-axis direction). Furthermore, the rear end 48a of the beam member is formed to be located forward in the Z-axis direction than the rear ends of the left leg 52a and the right leg 52b, and a space 50 communicating with the center trough 70 is formed in the area enclosed by the rear end of the left leg 52a, the rear end of the right leg 52b and the beam member 48. As a result, the outer circumferential shape of the trunnion base 44 is formed in a concave shape in plan view. Furthermore, the trunnion table 40 is positioned above the center trough 70 and below the inclined surface 48b of the beam member 48, and has coolant nozzles 66a and 66b that discharge cleaning coolant CT toward the workpiece mounting table 54 and the workpiece W. Therefore, by rotating the cradle 42 along the first rotary feed axis A using the servo motor 62, the orientation of the workpiece mounting surface 56 of the workpiece mounting table 54 is changed so that it faces the rear side where the space 50 is formed. This allows the workpiece W and the workpiece mounting table 54 to be positioned in the space 50 formed behind the coolant nozzles 66a and 66b located on the beam member 48. As a result, the cleaning coolant CT discharged from the coolant nozzles 66a and 66b diagonally upward and inward in the left and right directions is blown onto the chips accumulated around the workpiece W and the workpiece mounting table 54, and can fall into the center trough 70 via the space 50.

[0025] Furthermore, according to the machine tool 10 having the trunnion table 40 according to the present embodiment, the inner ends of the left leg portion 52a and the right leg portion 52b in the left-right direction are formed along the front-rear direction, and are formed at the same positions as both ends in the left-right direction of the center trough 70 formed along the front-rear direction. Therefore, the left end portion 50a and the right end portion 50b of the space portion 50 are formed at positions communicating with both left and right ends of the space formed in the center trough 70. Further, the work mounting table 54 disposed on the cradle 42 connected to the trunnion base 44 has the center axis O of the second rotary feed shaft B when the work mounting surface 56 is horizontally upward. B is positioned at a position forward of the center axis O of the first rotary feed shaft A A by a predetermined offset length D1. Therefore, when the machine tool 10 operates the servo motor 62 and the cradle 42 rotates and swings (changes its posture) along the first rotary feed shaft A so that the work mounting table 54 faces the column 28 and the spindle device 34 side, many parts of the work mounting table 54 and the work W attached thereto can be positioned on the rear side of the center axis O of the first rotary feed shaft A A , that is, on the space portion 50 side. As a result, the processed work W and the chips deposited on the work mounting table 54 can be directly dropped from the space portion 50 into the space in the center trough 70, so that the chip collection efficiency can be improved.

[0026] Furthermore, according to the machine tool 10 having the trunnion table 40 of this embodiment, the cradle 42 of the machine tool 10 is configured to change the orientation of the workpiece mounting surface 56 of the workpiece mounting table 54 from a state in which the workpiece mounting surface 56 is directed toward the front and upward side of the machine tool 10 (inclination angle A = 45 degrees) to a state in which the workpiece mounting surface 56 is directed toward the front and downward side of the machine tool 10 (inclination angle A = -195 degrees). Therefore, not only can the cradle 42 change orientation to accommodate machining at various inclination angles, but by rotating the cradle 42 along the first rotary feed axis A, cleaning coolant CT is discharged from below and to the side of the workpiece W toward the workpiece W and workpiece mounting table 54, which have been reoriented toward the space section 50 side, thereby washing away the chips accumulated on the workpiece W and workpiece mounting table 54 and causing them to fall into the center trough 70. Furthermore, by changing the orientation of the workpiece W and the workpiece mounting base 54 at any tilt angle, the cleaning coolant CT can be discharged from the coolant nozzle 66b into the gap SP1 that occurs at the connection between the cradle 42 and the workpiece mounting base 54. In addition, by rotating along the second rotary feed axis B, the number of areas to which the cleaning coolant CT can be directly applied can be increased, and chips in the intricate shapes of the workpiece W and in the T-grooves 56a of the workpiece mounting base 54 can be washed away. This suppresses or prevents chips from scattering outside the center trough 70, and allows the chips to fall into the center trough 70, thereby improving the efficiency of chip recovery.

[0027] As described above, the machine tool 10 having the trunnion table 40 according to this embodiment can efficiently wash away chips that accumulate on the machine tool 10, including the workpiece W after processing and the area around the trunnion table 40.

[0028] Furthermore, swash plates 68, as shown by the dashed lines in Figure 2, may be attached to the left and right sides of the front and rear of the trunnion table 40, respectively, to act as covers to prevent chips and cleaning coolant from getting on the guide rails 60. In this case, it goes without saying that the left-right inward slope of the vertical portions of the left and right swash plates 68 should be as close as possible to the left-right inward slope of the center trough (trough) 70. In addition, although the machine tool 10 has been described as a horizontal spindle machine in this embodiment, the present invention is not limited to this and may be applied to vertical spindle machine tools as well.

[0029] Although embodiments of the machine tool 10 having a trunnion table 40 have been described above, the present invention is not limited to the above embodiments. In addition to the above, it is expected that those skilled in the art will understand that various modifications of the above embodiments are possible. [Explanation of Symbols]

[0030] 10 Machine tools 26 beds 28 Columns 34 Spindle device 40 Trunnion Table 42 Cradle 44 Trunnion Base 48 Beam members 48b Slope 50 Space 52a Left leg 52b Right leg 54 Workpiece mounting stand 56 Workpiece mounting surface 60 Guide Rail 62. Servo motor (tilt and oscillation drive device) 66a Coolant nozzle 66b Coolant nozzle 68 Swash plate 70. Central Trough (Trough) A. First rotary feed axis (inclined oscillating feed axis) B Second rotational feed axis

Claims

1. A bed with a trough formed along the front-to-rear direction for receiving chips and coolant and guiding them out of the machine, A spindle device is positioned in a column erected on the rear side of the bed and configured to be movable along the left-right linear feed axis and the up-down linear feed axis, A trunnion table is provided, comprising a cradle having a workpiece mounting base, positioned across the trough such that the central axis of the tilting and oscillating feed axis of the cradle is perpendicular to the longitudinal direction of the trough, and configured to be movable along the linear feed axis in the front-rear direction which is perpendicular to the linear feed axis in the left-right direction and the linear feed axis in the up-down direction, A machine tool comprising a trunnion table for mounting a workpiece to be machined by a tool attached to the spindle device, The aforementioned trunnion table is It is trunnion-based, The left and right legs engage with guide rails positioned on the bed along the front-rear direction on both the left and right sides of the trough, are configured to be able to move linearly along the front-rear direction, and rotatably support the left and right sides of the cradle with bearings, A beam member connecting the lower part of the left leg and the lower part of the right leg on the front side, A space that communicates with the trough on the rear side, The trunnion base comprises, and the outer periphery is formed in a concave shape when viewed from above, A tilting and oscillating drive device rotates the cradle along the tilting and oscillating feed axis and changes the orientation of the workpiece mounting surface of the workpiece mounting table from at least horizontally upward to horizontally downward, A coolant nozzle is positioned above the trough on the beam member of the trunnion base and discharges cleaning coolant diagonally upward and rearward, A machine tool having a trunnion table, characterized by being equipped with the following:

2. A machine tool having a trunnion table according to claim 1, wherein the rear side of the beam member has an inclined surface that slopes downward toward the column.

3. A machine tool having a trunnion table according to claim 1, wherein the tilting and oscillating drive device is configured to rotate the tilting and oscillating feed shaft of the cradle so as to change its orientation between a position in which the workpiece mounting surface is directed upward and toward the front of the bed and a position in which the workpiece mounting surface is directed downward and toward the front of the bed.

4. The machine tool having a trunnion table according to claim 1, wherein the rear end of the beam member is at the same position in the front-rear direction as the central axis of the inclined oscillating feed shaft.

5. A machine tool having a trunnion table according to claim 1, wherein the workpiece mounting table has a rotary feed axis that rotates relative to the cradle about a central axis perpendicular to the workpiece mounting surface.

6. A machine tool having a trunnion table according to claim 5, wherein when the workpiece mounting surface is horizontally upward, the position of the central axis of the rotary feed shaft is located forward of the position of the central axis of the inclined oscillating feed shaft.

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