JP7265045B1 - Machine Tools - Google Patents

Abstract

An object of the present invention is to provide a machine tool having a table device that secures rigidity while achieving both weight reduction and improved chip discharge performance. A machine tool (10) for relatively moving a spindle (34) and a table (36a) and machining a workpiece attached to the table (36a) by a tool attached to the spindle (34) includes a bed (12) as a base of the machine tool (10), A base body 36 arranged on the upper surface side of the bed 12 extending in the front, rear, left, and right directions, on which a table 36a is arranged, and four legs spaced apart from each other and connected to the base body 36. A first leg portion 40 extending toward the right front side, a second leg portion 42 extending toward the right rear side of the bed 12, and a third leg portion extending toward the left front side of the bed 12. a table apparatus 14 having four legs consisting of 44 and a fourth leg 46 extending toward the rear left side of the bed 12; [Selection drawing] Fig. 1

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a machine tool having a table device that secures rigidity while simultaneously achieving weight reduction and improved chip discharge performance.

Patent Document 1 discloses a machining center (machine tool) having a bed, a table, a column, a spindle head, a spindle head, a spindle, an NC device, and an automatic tool changer. A pair of linear guides are arranged on the bed along the front-rear direction (Z-axis direction) of the machine. It is The table base is configured to be movable on rails of a pair of linear guides, and the table arranged on the upper surface side of the table base is movable along the Z-axis direction.

In such a machine tool, chips generated by machining the workpiece placed on the table tend to remain on the table base. In addition, although the rectangular table base is easy to ensure rigidity, it is heavy.

WO2020/089982

SUMMARY OF THE INVENTION In view of the above circumstances, it is an object of the present invention to provide a machine tool having a table device that secures rigidity while achieving both weight reduction and improved chip discharge performance.

According to the present invention, in a machine tool for processing a work by relatively moving a tool and a work, a bed as a base of the machine tool, a table on which the work is attached, and an upper surface side of the bed extending in the front, back, left, and right directions are provided. A base body on which a table is placed on the upper surface, and four legs separated from each other and connected to the base body, the first leg extending toward the right front side of the bed, the bed From the second leg extending toward the right rear side, the third leg extending toward the left front side of the bed, and the fourth leg extending toward the left rear side of the bed A machine tool is provided comprising: a table apparatus having four legs of

According to the machine tool according to the invention, the table device has four legs spaced apart from each other and connected to the base body. As a result, chips generated by machining the workpiece mounted on the table can be discharged downward from the table device through the space between the four legs, thereby improving the chip discharge performance of the machine tool. can be done. Also, the four legs extend in separate directions of the right front, right rear, left front and left rear sides of the bed. Therefore, it is possible to ensure uniform rigidity against loads acting on the table device from various directions. Furthermore, by having four legs spaced apart from each other, the table device can be made lighter while ensuring rigidity, compared to, for example, the case where the table device is formed in a plate shape. As a result, rigidity can be ensured while simultaneously reducing the weight of the table device of the machine tool and improving the chip discharge performance.

FIG. 1 shows a perspective view from above of a machine tool according to an embodiment of the present invention. FIG. 2 shows a perspective view of the table device. FIG. 3 shows a cross-sectional view of the table device taken along line AA shown in FIG.

A machine tool according to an embodiment will be described below with reference to the accompanying drawings. Similar or corresponding elements are denoted by the same reference numerals, and overlapping descriptions are omitted. In order to facilitate understanding, the scale of the drawings may be changed for explanation.

FIG. 1 shows, as an example, a machine tool 10 according to the present embodiment, which is a vertical machining center. In the drawing, the arrows indicate the machine front-back direction, the machine left-right direction, and the machine up-down direction when the machine tool 10 is arranged on a horizontal plane. In the drawings, Z indicates the machine front-back direction (Z-axis direction), X indicates the machine left-right direction (X-axis direction), and Y indicates the machine vertical direction (Y-axis direction).

The machine tool 10 includes a bed 12 as a base fixed to the floor of a factory, a table device 14 arranged on the upper surface of the bed 12 so as to be movable along the longitudinal direction of the machine, and a table device 14 arranged on the upper surface of the table device 14 . and a column 18 erected on the upper surface of the bed 12 . The table device 14 and the table 36a arranged on its upper surface constitute a rotary table having one or two rotary shafts. In addition, in FIG. 1, illustration of a housing forming an outer peripheral portion of the machine tool 10 is omitted.

Here, in the horizontal plane, the side on which the table device 14 is arranged (left side in FIG. 1) is called the front side of the machine, and the side on which the column 18 is erected (right side in FIG. 1) is called the rear side of the machine. The right hand side when viewing the table device 14 from the column 18 side is referred to as the machine right hand side (upper side in FIG. 1), and the left hand side is referred to as the machine left hand side (lower side in FIG. 1).

The machine tool 10 includes a pair of Z-axis linear motion guides 20 as guides arranged along the Z-axis direction on the upper surface side of the bed 12 . The table device 14 is connected to a carriage 22 as a mounting portion assembled to a Z-axis linear motion guide 20. A Z-axis ball screw unit 120 including a motor and a ball screw moves the table device 14 together with the carriage 22 in the longitudinal direction of the machine (Z-axis). direction).

The column 18 is attached to a pair of X-axis linear motion guides 30 arranged along the machine left-right direction (X-axis direction) on the upper surface side of the bed 12, and is X-axis driven by an X-axis ball screw unit 100 including a motor and a ball screw. It is configured to be reciprocatable (directly movable) along the axial direction. The machine tool 10 also includes a saddle 24 . The saddle 24 is attached to a pair of Y-axis direct-acting guides 26 arranged along the machine vertical direction (Y-axis direction) on the machine front side of the column 18 and on the top side of the bed 12, and includes a motor and a ball screw. It is configured to be reciprocatable (directly movable) along the Y-axis direction by the axial ball screw unit 110 .

A spindle head 32 is attached to the saddle 24 and protrudes toward the front side of the machine. The spindle head 32 supports a spindle 34 arranged on the front side of the machine so as to be rotationally driven by a built-in servomotor (not shown). A tool (not shown) is attached to the tip of the spindle 34, and a work (not shown) attached to the table 36a is machined by the tool. In order to perform a wide variety of machining, the machine tool 10 may be provided with a tool magazine or a tool changer so that the tools mounted on the spindle 34 can be changed.

FIG. 2 shows a perspective view of the table device 14. As shown in FIG. The table device 14 has a base body 36 on which a table 36a (see FIG. 1) is arranged, and four legs 40, 42, 44, 46 connected to the base body 36 while being spaced apart from each other. The table 36a has a pallet 16 on which workpieces are attached. Alternatively, the work may be configured to be directly attached to the table 36a.

The four legs 40, 42, 44, 46 of the table device 14 are a first leg 40 extending toward the right front side of the machine, a second leg 42 extending toward the right rear side of the machine, It consists of a third leg 44 extending toward the left front side of the machine and a fourth leg 46 extending toward the left rear side of the machine. These four legs 40, 42, 44, 46 extend away from each other in four distinct directions. Therefore, as in the case where the four legs 40, 42, 44, 46 extend along the same direction (for example, the left-right direction of the machine or the front-rear direction of the machine), the load from the extending direction is high. Not only is it rigid, but it is also possible to ensure rigidity against loads from both the machine left-right direction and the machine front-back direction.

The four legs 40, 42, 44, and 46 are formed in an X shape in plan view, and are configured to have a symmetrical structure in the machine front-rear direction and the machine left-right direction. Therefore, the table 36a and the table device 14 can be supported in good balance. Furthermore, the table device 14 can ensure uniform rigidity against loads acting from the longitudinal direction and/or lateral direction of the machine. The four legs 40, 42, 44, and 46 may have a structure that is symmetrical only in one of the machine front-rear direction and the machine left-right direction in a plan view.

Four legs 40 , 42 , 44 , 46 extend downward from the base body 36 . Therefore, it is possible to ensure rigidity against loads acting downward on the table 36a and the table device 14, such as the weight of the work attached to the table 36a and the load applied from the tool during machining.

A right side hole portion 48 as a hole portion is formed through the first leg portion 40 and the second leg portion 42 along the vertical direction of the machine. A left side hole portion 50 as a hole portion is formed through the third leg portion 44 and the fourth leg portion 46 along the vertical direction of the machine. Therefore, chips generated by machining the workpiece can be dropped (discharged) to the lower side of the table device 14 through the right hole portion 48 and the left hole portion 50 . The four legs 40, 42, 44, 46 extend outward from the table 36a in plan view. Therefore, it is possible to suppress or prevent chips from remaining on the four legs 40, 42, 44, and 46 (hindering chip discharge). Note that the table is not limited to this, and may be formed so as not to overlap the right side hole and the left side hole in a plan view.

Each of the four legs 40 , 42 , 44 , 46 has an inclined surface 52 that is inclined downward toward the right hole 48 or the left hole 50 . Therefore, it is possible to facilitate the discharge of chips generated by machining the workpiece downward through the right hole portion 48 or the left hole portion 50 .

FIG. 3 shows a cross-sectional view of the table device 14 taken along the vertical direction of the machine and the horizontal direction of the machine. A table 36a is arranged on the upper side of the base body 36, and a bearing 54 is arranged on the lower side of the table 36a. The base body 36 is formed to have an inverted truncated conical cross section (mortar shape) so that the outer peripheral shape of the base body 36 becomes smaller toward the lower side. Therefore, the right side hole 48 or the left side hole 50 can be formed larger toward the lower side of the table device 14, and it is possible to promote the discharge of chips generated by machining the work.

As shown in FIG. 1, the ends of the four legs 40, 42, 44, and 46 on the side of the Z-axis linear motion guide 20 are arranged on a carriage spaced apart from each other in the machine front-back direction and the machine left-right direction. 22. Also, the first leg portion 40 and the second leg portion 42 extending to the same right side of the right front side and the right rear side are connected via a connecting member 60 on the Z-axis linear motion guide 20 side. Similarly, the third leg portion 44 and the fourth leg portion 46 extending to the same left side on the left front side and the left rear side are connected via a connecting member 60 on the Z-axis linear motion guide 20 side. Thereby, the rigidity of the table device 14 can be improved.

Here, it is assumed that the first leg portion 40 and the second leg portion 42 are connected, and the third leg portion 44 and the fourth leg portion 46 are connected. Instead, the right front side and the left front side leg extending to the same front side may be connected, and the right rear side and the left rear side leg extending to the same rear side may be connected.

A space in which the table device 14 is arranged is a processing chamber 56 . A conveyor 58 as a chip discharging section is arranged along the longitudinal direction of the machine below the table device 14 in the processing chamber 56 . Therefore, chips generated by machining the workpiece can be discharged (dropped) onto the conveyor 58 through the right hole portion 48 or the left hole portion 50 . Moreover, the chips discharged onto the conveyor 58 can be moved to the machine rear side of the machine tool 10 by the conveyor 58 and discharged to the outside of the machine tool 10 . Furthermore, since the machining chamber 56 is not provided with an oil pan or the like, it is possible to prevent chips from accumulating in the oil pan or the like. As a result, the chip discharge performance of the machine tool 10 can be improved.

In the following description, the conveyor 58 is arranged on the lower side of the table device 14. However, the conveyor 58 is not limited to this. The chip discharging portion may be configured by a trough or the like.

The four legs 40, 42, 44, and 46 are arranged between the base body 36 and the carriage 22 on the side of the processing chamber 56 where the table 36a is arranged and the side of the Z-axis linear motion guide 20 (outside the processing chamber 56). ) are covered by a pair of covers 62 that separate the . The cover 62 is formed so as to incline downward toward the inside of the processing chamber 56 . Therefore, it is possible to suppress or prevent chips generated by machining the workpiece and coolant used in the table device 14 from scattering or being discharged outside the machining chamber 56 . The cover 62 is integrally attached to the table device 14, and reciprocates together when the table device 14 reciprocates along the longitudinal direction (Z-axis direction) of the machine. If necessary, a structure such as a bellows may be added to the portion where the cover 62 covers the table device 14 . To prevent chips and coolant from scattering outside the processing chamber 56, other covers are also connected. not shown.

Next, the operation and effects of the machine tool 10 according to this embodiment will be described below.

According to the machine tool 10 of this embodiment, the table device 14 has four legs 40 , 42 , 44 , 46 which are spaced apart from each other and connected to the base body 36 . A right hole 48 is formed through the first leg 40 and the second leg 42 along the vertical direction of the machine. A left side hole 50 is formed through the gap along the vertical direction of the machine. For this reason, the chips generated by machining the work attached to the table 36a are discharged (dropped) to the conveyor 58 through the right hole 48 and the left hole 50 between the legs 40, 42, 44, 46. , and the chip discharge performance of the machine tool 10 can be improved.

Further, according to the machine tool 10 according to this embodiment, the four legs 40, 42, 44, 46 extend in separate directions of the right front side, the right rear side, the left front side, and the left rear side of the bed 12. ing. For this reason, the rigidity of the table device 14 can be ensured against loads from both the machine left-right direction and the machine front-rear direction. Furthermore, by having the four legs 40, 42, 44, 46 that are spaced apart from each other, the table device 14 can be lightened while ensuring uniform rigidity, compared to, for example, the case where the table device is formed in a plate shape. Can be configured. Thereby, the rigidity can be ensured while reducing the weight of the table device 14 .

Furthermore, according to the machine tool 10 according to the present embodiment, the four legs 40, 42, 44, and 46 are formed in an X shape in plan view, and have a symmetrical structure in the machine front-back direction and the machine left-right direction. is configured to be Therefore, the table device 14 can be supported in a well-balanced manner, and the rigidity of the table device 14 can be uniformly ensured against loads acting from the longitudinal direction and/or the lateral direction of the machine.

Further, according to the machine tool 10 according to this embodiment, the four legs 40 , 42 , 44 , 46 extend downward from the base body 36 . Therefore, it is possible to ensure rigidity against loads acting downward on the table device 14, such as the weight of the work attached to the table 36a and the load applied from the tool during processing.

Furthermore, according to the machine tool 10 of this embodiment, the four legs 40, 42, 44, 46 extend outward from the table 36a in plan view. Therefore, it is possible to suppress or prevent chips from remaining on the four legs 40, 42, 44, and 46 (hindering chip discharge).

Further, according to the machine tool 10 according to this embodiment, the four legs 40, 42, 44, and 46 are each formed so as to be inclined downward toward the right hole portion 48 or the left hole portion 50 side. It has an inclined surface 52 with a Therefore, it is possible to facilitate the discharge of chips generated by machining the workpiece downward through the right hole portion 48 or the left hole portion 50 .

Furthermore, according to the machine tool 10 of the present embodiment, the base body 36 is formed to have an inverted truncated cone shape (mortar shape) in cross section so that the outer peripheral shape of the base body 36 becomes smaller toward the lower side. Therefore, the right side hole 48 or the left side hole 50 can be formed larger toward the lower side of the table device 14, and it is possible to promote the discharge of chips generated by machining the work.

Further, according to the machine tool 10 according to the present embodiment, the four legs 40, 42, 44, and 46 are arranged between the base body 36 and the carriage 22 on the machining chamber 56 side and the Z-axis linear motion guide 20 side. The cover 62 is formed so as to incline downward toward the inside of the processing chamber 56 . Therefore, it is possible to suppress or prevent chips generated by machining the workpiece and coolant used in the table device 14 from scattering or being discharged outside the machining chamber 56 .

As described above, the machine tool 10 according to the present embodiment can ensure the rigidity of the table device 14 while achieving both weight reduction and improved chip discharge performance.

Although the embodiment of the machine tool 10 has been described above, the present invention is not limited to the above embodiment. Those skilled in the art will appreciate that many variations of the above-described embodiments are possible.

REFERENCE SIGNS LIST 10 machine tool 12 bed 14 table device 40 first leg 42 second leg 44 third leg 46 fourth leg

Claims (11)

In a machine tool that relatively moves a tool and a workpiece to process the workpiece,
a bed as a base of the machine tool;
a table on which the workpiece is attached; a base body on which the table is placed on the upper surface side of the bed extending in the front, rear, left, and right directions; and four legs spaced apart from each other and connected to the base body. A first leg extending toward the right front side of the bed, a second leg extending toward the right rear side of the bed, and a second leg extending toward the left front side of the bed. a table device having four legs consisting of three legs and a fourth leg extending toward the left rear side of the bed ;
A machine tool according to claim 1, wherein said four legs are connected to mounting portions spaced apart from each other . 2. The machine tool according to claim 1, wherein said four legs are configured to have a symmetrical structure in plan view. Among the four legs, the table device has two legs that extend toward the same side, i.e., the front side and the rear side, or the left side and the right side. 3. A machine tool according to claim 1 or 2, characterized in that it has a hole formed through it toward. 4. The machine tool according to any one of claims 1 to 3, wherein the four legs extend downward from the table device from the base body. 5. The machine tool according to any one of claims 1 to 4, wherein the four legs are formed to extend outward from the table in a plan view. The machine tool according to any one of claims 1 to 5, wherein the base body is formed so that the outer peripheral shape becomes smaller toward the lower side. 7. The machine tool according to any one of claims 1 to 6, further comprising a chip discharger having a conveyor or a trough on the lower side of the table device. 8. The machine tool according to any one of claims 1 to 7, wherein said mounting portion is a carriage assembled so as to be able to move linearly with respect to a guide arranged on the upper surface side of said bed. machine. 8. Of the four legs, two legs extending toward the same side, i.e., the front side and the rear side, or the left side and the right side, are connected on the side of the carriage. The machine tool described in . 4. The four legs are covered by a cover that separates a processing chamber side in which the table is arranged from a side of the guide between the base body and the carriage. A machine tool according to claim 8 or claim 9 . A machine tool according to any one of claims 1 to 10, wherein said table is a rotary table having one or two rotary axes .

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