Machine tool

Abstract

To provide a machine tool including a chip recovery basket which enables easy removal in a scraping discharge device.SOLUTION: A machine tool includes: various kinds of processing devices for performing processing of workpieces in a processing chamber; a scraping discharge device which receives scrapings of the workpieces processed by the various kinds of processing devices with a storage tank disposed at a bottom part of the processing chamber to discharge the scrapings to the outside of the device; and a coolant device which filters a coolant stored in a coolant tank enclosing the storage tank to use the coolant repetitively. A circulation part for causing the coolant to flow from the storage tank to the coolant tank is formed at a side part of the storage tank which is located close to a front door of the processing chamber formed on a front surface of a machine body cover. At an outer side of the storage tank, a mesh recovery basket for capturing fine chips of scrapings is detachably attached to the side part so as to enclose the circulation part.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a machine tool having a chip discharge device, such as a chip conveyor, that is equipped with an easily removable chip collection basket. [Background technology]

[0002] Machine tools use cutting tools such as cutting tools and rotating tools such as drills to machine workpieces, and the chips generated inside the machine are washed away by coolant. Therefore, the chips are stored together with the coolant in a storage tank at the bottom of the machine, and the chips are discharged outside the machine by a chip discharge device such as a chip conveyor or a screw conveyor. With such chip discharge devices, relatively large chips can be transported outside the machine and collected, but small chips remain in the storage tank or the coolant tank surrounding the storage tank, where they sink and accumulate on the bottom.

[0003] The following Patent Document 1 discloses a machine tool in which a chip conveyor is provided with a structure for collecting some of the chips. In the conventional example of the document, a flow port is formed in the inclined rising part of the chip conveyor, and the coolant that passes through the flow port is collected in a drain chamber. Furthermore, a removable basket is housed in the drain chamber as a filter, and the drain chamber is connected to a coolant storage tank via a drain hose. In this conventional example, when chips are carried by the chip conveyor to the top and remain there without falling, even if they slide down the inclined part, they are collected by the basket in the drain chamber and do not flow out to the storage tank. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2008-238286 A Summary of the Invention [Problem to be solved by the invention]

[0005] In chip discharge devices such as chip conveyors, fine chips float on the liquid surface in a storage tank where coolant is stored without being carried away. For example, in the structure of the conventional example, some of the chips sink in the storage tank and accumulate on the bottom, and some flow into the drain chamber. In the conventional example, the basket is a metal mesh with openings that can remove fine chips from the coolant, so it can be said that chips received in the basket are easy to discharge. However, the conventional example has a special structure such as a drain chamber, in which the basket is placed, resulting in a complicated structure. In addition, the drain chamber and the basket are located behind the inclined part of the chip conveyor, making it very inconvenient for workers to handle the basket, such as putting it in and taking it out.

[0006] SUMMARY OF THE PRESENT DISCLOSURE In order to solve the above problems, an object of the present invention is to provide a machine tool having a chip discharge device with an easily removable chip collection basket. [Means for solving the problem]

[0007] The machine tool of the present invention has various processing devices for processing workpieces within a processing chamber, a chip discharge device for receiving chips from the workpiece processed by the various processing devices in a storage tank located at the bottom of the processing chamber and discharging them outside the machine, and a coolant device for repeatedly using coolant by filtering the coolant stored in a coolant tank surrounding the storage tank, and a circulation section for flowing coolant from the storage tank to the coolant tank is formed in the side of the storage tank near the front door of the processing chamber formed on the front surface of the body cover, and a mesh collection basket for capturing fine chips in the chips is removably attached to the side so as to surround the circulation section on the outside of the storage tank. Effect of the Invention

[0008] According to the above-mentioned configuration, the workpiece is machined by the various machining devices in the machining chamber, and the chips of the workpiece generated there are washed away by the coolant and fall into the storage tank located at the bottom of the machining chamber to be stored. The chips in the storage tank are discharged outside the machine by the chip discharge device, but the fine chips in the chips float on the surface of the coolant, and some of them flow together with the coolant through the circulation section and from the storage tank to the coolant tank. At that time, the chips are captured by a mesh collection basket when they flow out of the storage tank. The collection basket in which the chips have accumulated is removably attached to the side of the storage tank near the front door of the machining chamber formed on the front of the machine cover, so that the operator can easily remove it. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view showing an internal structure of a machine body in one embodiment of a machine tool. [Diagram 2] FIG. 2 is an external perspective view showing the chip conveyor. [Diagram 3] FIG. 2 is an external perspective view of a machine tool covered with a machine body cover. [Figure 4] 13 is a perspective view showing a collection basket attached to a flow section of the storage tank. FIG. [Diagram 5] 4 is an enlarged view showing the feet of an operator standing at a working position relative to the machine tool, surrounded by a two-dot chain line in FIG. 3. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] An embodiment of a machine tool according to the present invention will be described below with reference to the drawings. Fig. 1 is a diagram showing the machine tool of this embodiment, and in particular a perspective view showing the internal structure of the machine body. The machine tool 1 of this embodiment is a small NC lathe in which various processing devices for processing a workpiece are mounted on a slant-type bed 6. The upper surface of the bed 6 is inclined forward, and mounted thereon are a first workpiece spindle device 3 that rotatably holds a workpiece, a second workpiece spindle device 4 that is disposed opposite the first workpiece spindle device 3 and rotatably holds a workpiece, and a turret device 5 having a plurality of turret tools T.

[0011] A first work spindle device 3 is disposed on the left side in front of the bed 6, and a second work spindle device 4 is disposed on the opposite right side. The first and second work spindle devices 3, 4 have spindles that are horizontal and in the machine width direction, and are further disposed coaxially. In this embodiment, the direction parallel to the spindles of the first and second work spindle devices 3, 4 (the left-right width direction of the bed 6) is described as the Z axis. The second work spindle device 4, which is coaxial with the first work spindle device 3, is configured to move in the machine width direction parallel to the Z axis.

[0012] The first work spindle device 3 has a spindle 12 rotatably assembled within a casing 11, and a spindle chuck fixed to the spindle 12 is rotated by a spindle motor to rotate the gripped workpiece. The second work spindle device 4 is similarly configured to have a rotatable spindle 16 assembled within a casing 15, and a spindle chuck fixed to the spindle 16 is rotated by a spindle motor. In the first work spindle device 3, the casing 11 is integrated with a headstock 13, and the headstock 13 is fixed to the bed 6, but in the second work spindle device 4, the casing 15 is mounted on a slidable headstock 14 and configured to move in the Z-axis direction.

[0013] Two guide rails 18 parallel to the Z axis for the second workpiece spindle device 4 are fixed to the bed 6. A guide block is fixed to the underside of the headstock 14, and a linear guide is formed by meshing the guide block with the guide rails 18. A screw shaft 19 parallel to the Z axis is journaled between the two guide rails 18, and a rotating shaft of a Z axis servo motor (not shown) is connected to the screw shaft 19. A nut member through which the screw shaft 19 passes is fixed to the underside of the headstock 14, and a ball screw mechanism is formed in which the headstock 14 moves linearly in the Z axis direction by the rotation output of the Z axis servo motor.

[0014] A turret device 5 is disposed behind the second workpiece spindle device 4. In the turret device 5, a plurality of turret tools T are attached at equal intervals in the circumferential direction to a disk-shaped turret tool rest 21, and the turret tool T used for machining is indexed by rotating the turret tool rest 21. The turret device 5 is configured so that the turret tool rest 21 moves in the Z-axis direction, a vertical direction perpendicular to the Z-axis, and a 45-degree direction that is the same as the inclination of the upper surface of the bed 6. In this embodiment, the vertical direction is defined as the Y-axis, and the inclination direction of the upper surface of the bed 6 is defined as the X-axis.

[0015] Two guide rails 23 parallel to the Z axis are fixed to the rear right part of the bed 6, and a linear guide is formed by these and a guide block fixed to the underside of a turret table 24. The turret table 24 is capable of moving in the Z axis direction by a ball screw mechanism. That is, a screw shaft 25 parallel to the Z axis is supported between the two guide rails 23 via bearings, and the screw shaft 25 passes through a nut member fixed to the underside of the turret table 24.

[0016] A rotating shaft of a Z-axis servo motor 26 is connected to the screw shaft 25, and the rotation output of the motor causes the turret table 24 to move linearly in the Z-axis direction. A turret X-axis slide 27 is attached to the turret table 24 so as to slide on an X-axis guide rail formed on the upper surface of the turret table 24. The turret X-axis slide 27 has a vertical front surface on which a Y-axis guide rail is formed, and a turret main body 28 including the turret tool rest 21 and the indexing servo motor 22 is attached so as to slide on the Y-axis guide rail.

[0017] A screw shaft (not shown) connected to an X-axis servo motor 29 is supported by the turret table 24 via a bearing, and the screw shaft passes through a nut member fixed to the turret X-axis slide 27. Similarly, a screw shaft (not shown) connected to a Y-axis servo motor 30 is supported by the turret X-axis slide 27 via a bearing, and the screw shaft passes through a nut member fixed to the turret main body 28. Therefore, the rotational outputs of the X-axis servo motor 29 and the Y-axis servo motor 30 cause the turret X-axis slide 27 to move linearly in the X-axis direction, and the turret main body 28 to move linearly in the Y-axis direction.

[0018] The machine tool 1 of this embodiment is capable of a first machining process for a workpiece on the first workpiece spindle device 3 side and a second machining process for a workpiece on the second workpiece spindle device 4 side. In the first machining process, the turret tool T indexed by the turret device 5 moves to the workpiece gripped by the first workpiece spindle device 3 according to control in each axial direction. That is, the turret body 28 moves from the right side to the left side of the bed 6 in the machine body width direction, which is the Z axis, by drive control of the Z axis servo motor 26, and further moves in the machine body front-rear direction and machine body up-down direction by drive control of the X axis servo motor 29 and the Y axis servo motor 30 in combination. Then, outer diameter machining using a cutting tool is performed on the rotating workpiece, and hole drilling using a drill is performed on the phase-determined workpiece.

[0019] In the second machining, the second work spindle device 4 moves from the right side to the left side on the bed 6, and the work is handed over to the first work spindle device 3 by their chucks. At this time, the gripping state of the work is reversed, and the back surface of the work can be machined in the second machining. The second work spindle device 4 that grips the work is again driven and controlled to move from the left side to the right side in the machine body width direction and return to its original position. Then, as in the first machining, the turret body 28 moves to the right side of the bed 6 in accordance with the drive control of the Z-axis servo motor 26, and also moves in the machine body front-rear direction and up-down direction in accordance with the drive control of the X-axis servo motor 29 and the Y-axis servo motor 30. Then, the predetermined machining such as turning is performed on the work.

[0020] The machine tool 1 thus configured is covered by a machine body cover 9 (see FIG. 3), and a sealed machining chamber is formed inside the machine body cover 9. In the machining chamber, the machine tool 1 performs turning with a cutting tool or drilling with a drill, and chips such as swarf are generated from the work. The machine tool 1 is provided with a coolant device that sprays coolant to wash away the chips and to cool the machined part. The coolant splashes in the machining chamber, and the washed-away chips flow down the floor surface along the slope of the bed 6. The coolant device is configured to repeatedly use the coolant stored in the coolant tank 31 by filtering it with a filter.

[0021] FIG. 2 is an external perspective view showing a chip conveyor 8, which is an example of a chip discharge device. A coolant tank 31 is arranged horizontally in front of the bed 6, and the chip conveyor 8 is incorporated therein. The chip conveyor 8 takes out chips from the coolant and carries them out of the machine, and is provided with a storage tank 32 with a large inlet 321 facing the upper machining chamber. The storage tank 32 is designed to store chips generated in the first and second machining processes and the coolant that has washed away the chips. The chip conveyor 8 is incorporated with an endless belt (not shown in the drawing) so as to take out chips from the coolant in the storage tank 32 and discharge them out of the machine.

[0022] The chip conveyor 8 is assembled so that an inclined rising section cover 33 is formed continuously with respect to a horizontal storage tank 32, and an endless belt runs around between the horizontal and inclined sections. Here, FIG. 3 is an external perspective view of the machine tool 1 covered by the machine body cover 9, and as shown in the figure, the rising section cover 33 of the chip conveyor 8 extends so as to protrude from the side of the machine body to the outside. The rising section cover 33 has a downward discharge port formed at its upper end 34, where the belt turns back downward from the top. Therefore, chips transported to the upper end 34 drop and are collected in a collection box (not shown) placed below.

[0023] When the chips are discharged, the coolant adhering to the chips also falls off along the way, flows down inside the riser cover 33, and accumulates in the storage tank 32. Furthermore, even the finest chips among the chips remain in the coolant in the storage tank 32. Chips that tend to float will sink in the storage tank 32 over time, and also flow outward and sink in the coolant tank 31. For this reason, the storage tank 32 and the coolant tank 31 need to be cleaned periodically, but the machine tool 1 of this embodiment is particularly configured to reduce the frequency of cleaning the coolant tank 31.

[0024] In the coolant device of the machine tool 1, large chips are discharged from the coolant in the storage tank 32 to the outside of the machine, and some of the fine chips are carried by the flow of the coolant to the coolant tank 31. That is, a circulation section 35 is formed on the side of the storage tank 32, and the insides of the storage tank 32 and the coolant tank 31 are connected. FIG. 4 is a perspective view showing a collection basket attached to the circulation section 35 of the storage tank 32. As shown in the figure, a mesh collection basket 36 is detachably attached to the outside of the storage tank 32 so as to surround the circulation section 35. This is to capture chips that flow out from the storage tank 32 to the coolant tank 31.

[0025] The flow sections 35 are elliptical and oriented horizontally so that their longitudinal direction is aligned with the height of the liquid surface, and two of them are arranged close to each other and formed at the same height against the side wall of the storage tank 32. The collection basket 36 is attached to the side wall of the storage tank 32 from the outside so as to surround the two flow sections 35. The collection basket 36 is formed of a metal mesh with openings large enough to allow the coolant to pass through and capture the chips. However, the size of the openings that make up the mesh does not need to be large enough to block all chips, even the finest ones, as long as it can capture a certain amount of chips.

[0026] The collection basket 36 has a box-like shape with an open top, and a large opening 361 is formed on the side surface in contact with the storage tank 32 so as not to block the flow section 35. Furthermore, the side surface extends left and right and upward, and mounting sections 363 are formed on the left and right, and a hook section 365 is formed on the upper side. A mounting plate 37 is fixed to the side of the storage tank 32 at a position sandwiching the two flow sections 35. The mounting plate 37 is made of two overlapping plates of different sizes, and is designed to create a gap (slit section) between the side of the storage tank 32. The mounting section 363 has a step formed so that the part inserted into the gap and the part hooked on the mounting plate 37 have different widths. Therefore, the collection basket 36 is attached to the mounting plate 37 by being inserted from above, and the collection basket 36 can be removed by a worker hooking his or her finger on the bent hook section 365 and pulling it up.

[0027] The circulation section 35 is formed by penetrating the side of the storage tank 32 to circulate the coolant, but the machine tool 1 is configured so that the collection basket 36 is located near the feet of the operator so that the chip discharge work can be easily performed. As shown in FIG. 3, the position where the operator S is standing is the work position where the operator S performs a predetermined work on the machine tool 1. This is because there is an openable front door 41 at the front of the machine body that allows the operator to work inside the machining chamber, and to the right of the door is an operation panel 45 for the operator to perform various operations. Therefore, it can be said that the configuration in which the operator S can perform the chip collection work without moving from the standing position at the front of the machine body is excellent in workability.

[0028] 5 is an enlarged view showing the feet of an operator S standing at a working position relative to the machine tool 1, surrounded by a two-dot chain line in FIG. 3. The machine body cover 9 has a lower center cover 42 below a front door 41, and is configured to be removable as shown in the figure. Therefore, by removing the lower center cover 42, the hidden collection basket 36 appears at the feet of the operator S. The flow section 35 of the storage tank 32 shown in FIG. 2 is formed near the front door 41.

[0029] 1, the inlet 321 of the chip conveyor 8 is open wide toward the machining chamber and occupies the entire horizontal storage tank 32 so as to receive chips that fall from the workpieces during the first and second machining processes. The circulation section 35 of the storage tank 32 is formed at a position closer to the first workpiece spindle device 3 side of the inlet 321. This mounting position is because it provides good workability for the worker S standing at the working position in front of the machine body. In other words, the position of the circulation section 35 where the collection basket 36 is mounted is the lower part on the front side of the machine body, and particularly in this embodiment, it is below the front door 41 located in the center.

[0030] In general, a machine tool has a front door opened to perform a predetermined operation on a spindle device and the like in a machining chamber. A storage tank is arranged corresponding to the position of the spindle chuck so that a chip discharge device such as a chip conveyor or a screw conveyor also receives chips. Therefore, even if the machine tools have different structures, the entire storage tank of the chip discharge device or a part of the storage tank is located in the lower front part of the machine body. Therefore, even if a machine tool has a structure different from that of machine tool 1, the flow section of the storage tank can be formed in the lower front part of the machine body as in this embodiment.

[0031] In addition, in the case of the machine tool 1, the circulation section 35 of the storage tank 32 is formed close to the first work spindle device 3 side. This is because the machine tool 1 is structured mainly for workpiece machining using the first work spindle device 3, and a large amount of coolant flows to the first work spindle device 3 side. In other words, the position of the circulation section 35 is preferably a location where the flow from the storage tank 32 to the coolant tank 31 is strong, from a viewpoint other than the above-mentioned improvement in workability. This is because the cutting chips in the storage tank 32 flow out to the coolant tank 31 with the flow of the coolant. However, as described above, in a general machine tool, a predetermined operation is performed on the spindle device and the like in the machining chamber by opening the front door. For this reason, even from the viewpoint of the flow of the coolant other than the improvement in workability, the position of the circulation section 35 to which the collection basket 36 is attached is preferably a lower part on the front side of the machine body, below the front door, even in various machine tools.

[0032] In the machine tool 1 of this embodiment, chips and the like floating in the coolant in the storage tank 32 are captured by the collection basket 36 as they flow through the circulation section 35 into the coolant tank 31. Therefore, the total amount of chips and the like flowing into the coolant tank 31 is less than in the past, and the cleaning period for collecting chips and the like accumulated on the bottom surface can be extended. Instead, to prevent clogging, it is necessary to periodically remove the chips and the like accumulated in the collection basket 36, but such work can be done very easily by removing the collection basket 36, and the workload on the worker is very light.

[0033] In addition, since the recovery basket 36 is attached to the side of the storage tank 32 by inserting a small portion of the attachment portion 363 into the attachment plate 37, it is only necessary to hook the fingers on the hook portion 365 and pull it up when removing it as well as when installing it. Therefore, the recovery basket 36 is extremely easy for the worker to operate. Moreover, since the recovery basket 36 is located at the feet of the worker standing in front of the machine tool 1, there is no need to go around to the back of the machine body and operate it in a narrow space, which also reduces the burden on the worker.

[0034] Although one embodiment of the present invention has been described above, the present invention is not limited to this embodiment, and various modifications are possible without departing from the spirit of the present invention. For example, in the above embodiment, the machine tool 1 is an opposed two-axis lathe, but the present invention may be applied to lathes of different structures, as well as machining centers and hobbing machines. [Explanation of symbols]

[0035] 1...machine tool 3...first work spindle device 4...second work spindle device 5...turret device 8...chip conveyor 9...machine body cover 31...coolant tank 32...storage tank 33...rising section cover 35...circulation section 36...recovery basket 37...mounting plate 41...front door 42...lower center cover 321...feeding port 361...opening 363...mounting section 365...hook section

Claims

1. Various processing devices for processing the workpiece in the processing chamber; a chip discharge device that receives chips of the workpieces processed by the various processing devices in a storage tank arranged at the bottom of the processing chamber and discharges them outside the machine; a coolant device for repeatedly using the coolant by filtering the coolant stored in a coolant tank surrounding the storage tank; having A machine tool in which a circulation section for flowing coolant from the storage tank to a coolant tank is formed in a side section of the storage tank near a front door of the machining chamber formed on the front surface of the body cover, and a mesh collection basket for capturing fine chips in the cuttings is removably attached to the side section on the outside of the storage tank so as to surround the circulation section.

2. 2. The machine tool according to claim 1, wherein the machine body cover on which the front door is provided has a removable lower cover below the front door, and the collection basket is located in a portion where the lower cover is removed.

3. A machine tool as described in claim 1 or claim 2, wherein a slit portion is formed in the side of the storage tank at a position sandwiching the circulation portion, the collection basket has a box-like shape with an open top, and the side surface adjacent to the side of the storage tank has a large opening so as not to block the circulation portion, and an attachment portion that can be inserted into the slit portion.

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