JPH09262728A - Machine tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To process the outside diameter of the tip of a ram and to make it easy to make access to a work by a method wherein a protrusion part is protruded upward from the rear part of the ram and the rotor or the stator of a linear motor is arranged at the protrusion part. SOLUTION: A ram is provided at an upper rear part with a rectangular box part 7c and by mounting linear motor moving elements L3b and L3b on the box part, the tip part of the ram protruding through a through-hole, formed in the central part of the rectangular front plate part of an Y-slide, to a machining region is formed in a cylindrical shape and an outside diameter is reduced. This constitution improves accessibility to a work. Further, since the ram tip part is formed in a cylindrical shape, chips are hardly accumulated on an upper part, and sealing is also easy to make, by mounting a cover, partitioned into a machining region and a machine region, on the front of the Y-slide, entrance of the chip and cutting oil to the machine region is prevented from occurring.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a machine tool using a linear motor, and more particularly to a structure of a ram drive mechanism section in which a horizontal main shaft is rotatably supported.

[0002]

2. Description of the Related Art In FTL (flexible transfer line), productivity of machine tools has recently been required more than ever. Therefore, in order to increase the productivity equivalent to that of the conventional transfer machine, the current 2
It is necessary to increase the speed by a factor of two to three, and increasing the speed of feed along with the spindle is an issue.

By the way, a ball screw and a servomotor are generally used as a feed driving means in a machine tool, but if a ball screw is used to increase the speed, the limit of DmN, vibration and noise increase. However, there are problems such as critical speed, increase in thermal expansion due to temperature rise, and decrease in rigidity due to high lead, and there is a limit to performing high speed feed and high acceleration / deceleration feed. Therefore, recently, a linear motor having no friction and high rigidity is being adopted as a driving means of a machine tool.

In particular, since the feeding ram of a machine tool repeats frequent positioning with a short stroke, a linear motor is suitable as its driving means.

Japanese Patent Application Laid-Open No. 6-179154 discloses a linear motor used as a driving means for a ram.
That is, Japanese Patent Application Laid-Open No. 6-179154 discloses a ram having a prismatic shape and a linear motor arranged on the outer peripheral surface thereof.

[0006]

However, since the linear motor does not have a closed structure like the rotary motor, chips or the like are likely to enter between the linear motor mover and the stator, which may cause magnetic short circuit. There is a possibility that problems such as thrust reduction and seizure may occur. In the above-mentioned conventional example, it is necessary to cover the entire protruding portion of the ram tip with a bellows cover in order to prevent chips from entering the linear motor. However, due to the deterioration of the cover, there is a possibility that fine cutting chips enter together with the cutting oil through the cover gap or the like, and travel along the ram and enter the inside of the motor below the ram.

Further, in the above-mentioned conventional example, the outer diameter of the ram is large because the outer diameter of the ram is formed in a prismatic shape for mounting the linear motor and the moving elements of a plurality of linear motors are directly mounted on the outer circumference of the ram. The attachment of the cover further increases the ram diameter, resulting in extremely poor accessibility to the workpiece. Further, since a motor that is a heat source is directly mounted on the outer periphery of the ram, there is a problem that the ram is thermally deformed and the machining accuracy is reduced.

In view of the above points, the present invention can improve the accessibility to the workpiece without increasing the size of the ram tip, further reduce the thermal effect of the linear motor to improve the machining accuracy, and improve the cutting accuracy. An object of the present invention is to provide a machine tool having a ram structure driven by a linear motor, which prevents powder and cutting oil from entering the inside of the motor to improve reliability.

[0009]

A first aspect of the present invention is a machine tool in which a ram having a horizontal main shaft rotatably supported is supported by a ram support member so as to be capable of advancing and retracting in the axial direction thereof. Part of the linear motor is mounted on the protrusion, and the linear motor is fixed on the protrusion by mounting the linear motor's mover or stator on the protrusion. It is characterized in that a child or a mover is provided.

According to a second aspect of the present invention, the protruding portion protruding from the rear portion of the ram has a surface symmetrical with respect to the surface including the ram axis, and the moving element or the stator of the linear motor is provided on each of the symmetrical surfaces. It is characterized by being attached.

According to a third aspect of the invention, on both side surfaces of the rear portion of the ram,
A guide mounting portion that is symmetrical with respect to a surface including the ram axis is formed to project, and a guide that engages with a rail provided on the ram support member is fixed to the guide mounting portion. To do.

A fourth aspect of the invention is characterized in that the ram driven by the linear motor is formed in a cylindrical shape.

A fifth aspect of the present invention is characterized in that the protruding portion protruding upward at the rear portion of the ram is formed in a hollow box shape.

[0014]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a front perspective view showing the entire machine tool of the present invention, and FIG. 2 is a rear perspective view thereof. In FIGS. 1 and 2, reference numeral 1 is a vertical bed of a machine tool, and a horizontal bed 2 is arranged on the lower part of the front side of the vertical bed 1, and a workpiece (not shown) is placed and fixed on the horizontal bed 2. The table 3 is fixed.

An X slide 4 is supported on the front surface of the vertical bed 1 so as to be movable in the X axis direction (horizontal direction), and the Y slide 5 is mounted on the X slide 4 in the Y axis direction (vertical direction). A ram 7 which is movably supported and further rotatably supports a horizontal main shaft 6 is movably supported on the Y slide 5 in the Z-axis direction (front-back direction). Then, the X slide 4, the Y axis slide 5 and the ram 7 are respectively attached to the vertical bed 1 in the X axis direction, the Y axis direction or the Z axis.
By moving the spindle 6 in the axial direction, the spindle 6 can be moved and positioned in three axial directions orthogonal to each other with respect to the workpiece mounted and fixed on the table 3.

By the way, the X slide 4, the Y slide 5 and the ram 7 are driven by axial feed by two linear motors arranged in parallel with each other.

The linear motor is two flat plates made of laminated steel plates, on the surface of which magnetic pole teeth having a U-shaped cross section formed at equal intervals in the direction orthogonal to the longitudinal direction and at equal intervals are formed. A long flat plate-shaped stator laid over the stroke length and a magnetic pole tooth of the stator are arranged so as to face each other, and a permanent magnet and a coil are arranged on the surface at equal intervals in the direction orthogonal to the longitudinal direction over the entire length at equal intervals. It is composed of arranged short flat plate-shaped moving elements, and the moving elements and the stator are arranged in each drive unit with a predetermined gap (0.05 to 0.2 mm).

As shown in FIGS. 3 and 4, the vertical bed 1 has a horizontally long rectangular frame shape having a through hole 1a in the center in front view, and a horizontal bed 2 (not shown) on the lower front side.
Are connected. On the front side of the vertical bed 1, two rails R _1a and R _1b extending in the X-axis direction are laid at upper and lower positions with the through hole 1a interposed therebetween, and the rail R _1a.
Above and above the rail R _1b , linear motor stators L _1a and L _1a for driving the X slide 4 are arranged in parallel with the rails R _1a and R _1b , respectively.

On the other hand, as shown in FIGS. 5 and 6, the X slide 4 is made of a light alloy such as an aluminum alloy and has a vertically long rectangular frame shape having a through hole 4a at the center in a front view.
That is, the X-slide 4 has vertical cross-sections 4b, 4b having right and left quadrangular cross-sections, and upper and lower end portions of the vertical column parts 4c, 4b, respectively.
4c is connected to each other. Both transverse girders 4 above
A plurality of guides G _1a and G _1b , which engage with upper and lower rails R _1a and R _1b extending in the X-axis direction, which are laid on the vertical bed 1, are mounted on the back surfaces of the c and 4c, respectively. The guides G _1a and G _1b are engaged with the upper and lower rails R _1a and R _1b laid on the vertical bed 1, respectively, and the X slide 4 is attached to the vertical bed 1 along the rails R _1a and R _1b. It is slidably supported in the X-axis direction.

Further, both lateral girder portions 4c of the X slide 4 are
On the back surface of 4c, above the guide G _1a and the guide G _1b.
Below each of the guides G _1a , G _1b and adjacent to each other by X.
The linear motor movers L _1b and L _1b extending in the axial direction are mounted, and are arranged to face the linear motor stators L _1a and L _1a mounted on the vertical bed 1.

A liner 8 for adjusting the gap between the linear motor stator L _1a and the linear motor mover L _{1b is} interposed between the linear motor movers L _1b and L _1b and the motor mounting surface of the X slide 4. Inside the liner 8, cooling oil flow passages are formed in a grid pattern and communicated with a cooling oil source by a pipe line (not shown).

Further, rails R ₂ and R ₂ extending in the vertical direction (Y-axis direction) are laid on the front surfaces of the left and right vertical column portions 4b and 4b on the front surface side of the X-slide 4, respectively. Linear motor stators L _2a and L _2a for driving Y slides extending in the Y-axis direction are provided on the respective outer side surfaces of the portions 4b and 4b which face each other.

FIG. 7 is a front perspective view of the Y slide 5 attached to the X slide 4, and FIG. 8 is a rear lower perspective view of the Y slide 5, showing a circular through hole _5a1 in the center in front view. The Y-slide 5 of the Y-slide 5 is formed by the horizontally long rectangular front plate portion 5a and the box frame portion 5b formed integrally with the front plate portion 5a and projecting rearward from the center of the rear surface and having a U-shaped cross section that opens downward. A body portion 5c is formed.

Motor mounting plates 5d, 5d having an L-shaped cross section are mounted on both sides of the front portion of the body portion 5c of the Y slide. That is, the motor mounting plate 5d having the L-shaped cross section is formed on the back surface of the front plate portion 5a of the Y slide body portion 5c.
One side is fixed, and the other piece of the motor mounting plate 5d is fixed to the side surface of the box frame portion 5b. The front plate portion 5a, the side surface of the box frame portion 5b and the motor mounting plate 5d having an L-shaped cross section are vertically attached. A frame portion 5e having a quadrangular cross section is formed so as to penetrate in the direction.

On the back surface of the front plate portion 5a, a plurality of guides G ₂ and G ₂ are mounted in the Y-axis direction at positions adjacent to both side surfaces of the box frame portion 5b.

Then, the frame portion 5e having a quadrangular cross section of the Y slide 5 is loosely fitted so as to surround the vertical column portion 4b of the X slide 4 (FIG. 9), and the guides G ₂ and G ₂ are attached to the X slide 4. The Y slide 5 is supported by the rails R ₂ and R ₂ laid on the front surface of the vertical column portion 4 b so as to be slidable in the Y axis direction with respect to the X slide 4. In this case, the U-shaped box frame portion 5b projecting to the back side of the front plate portion 5a is inserted into the through holes 1a and 4a of the vertical bed 1 and the X slide 4, and the tip end thereof is projected into the vertical bed 1. Therefore, the box frame portion 5b does not interfere with the vertical bed 1 and the X slide 4 over the movement range as the X slide 4 and the Y slide 5 move.

On the inner surface of each motor mounting plate 5d, each linear motor stator L _2a provided on each vertical column portion 4b of the X slide 4 is opposed to the linear motor stator L _2a. The linear motor mover L _2b is fixed so as to maintain the gap. Cooling oil passages are formed in a grid pattern inside the motor mounting plate, and are connected to a cooling oil source by a pipe line (not shown).

As shown in FIG. 8, box portions 5f and 5f are formed symmetrically on the inner surfaces of the side wall portions of the box frame portion 5b of the Y slide 5 which are opposed to each other, and the bottom surfaces of the box portions 5f and 5f are formed. Rails R ₃ and R ₃ extending in the Z-axis direction are laid respectively, and ram driving linear motor stators L _3a and L _3a are arranged and fixed on the inner surfaces of the boxes 5f and 5f facing each other. Has been done. Further, a plurality of ventilation holes 5g for removing heat generated in the box frame portion 5b by a linear motor are formed in the top plate portion of the box frame portion 5b, and a fan is provided if necessary. Thus, the cooling effect of the linear motor section can be increased.

On both the left and right motor mounting plates 5d of the Y slide 5, brackets are respectively provided on the rear side of the surface on which the linear motor mover L _2b is mounted, that is, on the outer surface side, at positions corresponding to the linear motor mover L _2b. 9 is provided, and the tip of the piston rod 10a of the counterbalance cylinder 10 in the Y-axis direction is pivotally attached to the bracket 9, while the cylinder body 10b of the counterbalance cylinder 10 is attached to the lower side surface of the X slide 4. Bracket 1
1 (see FIG. 10), and each cylinder body 1
0b is connected to the air source by a pipe line (not shown).

FIG. 11 is a side perspective view of a ram 7 which rotatably supports a horizontal main shaft 6. The ram 7 has a cylindrical ram body 7a made of a light alloy such as an aluminum alloy, and the ram body 7a. A protective cylinder coated with chrome plating is fitted on the outer surface of the. On the rear portion of the ram body 7a, a plurality of guide mounting portions 7b, which are axially separated from each other, are formed on both side surfaces of the ram body 7a so as to project symmetrically with respect to the surface including the axis of the ram 7. Mounting part 7
A guide G ₃ extending in the Z-axis direction is fixed on b.

Further, a rectangular box portion 7c which stands upright in the vertical direction is integrally projectingly formed on the upper surface of the rear portion of the ram body 7a, and the rams of the Y slide 5 are provided on both side surfaces of the box portion 7c. Linear motor movers L _3b and L _3b are fixed via a gap adjusting liner 12 so as to face the driving linear motor stators L _3a and L _3a while maintaining a predetermined gap. Cooling oil passages are formed in a grid pattern inside the liner 12, and are connected to a cooling oil source by a pipe line (not shown). Cylindrical stoppers 13 made of urethane foam are fixed to the front and rear end surfaces of the rectangular box portion 7c.
Is moving beyond a predetermined stroke, the rectangular box portion 7c collides with the front front plate portion 5a or the rear rear plate portion 5h of the Y slide box frame portion 5b through the stopper 13. The movement of the ram 7 is stopped, the ram 7 is disengaged from the rail R ₃ that guides and supports the ram 7, and the ram 7 does not drop off from the Y slide 5. Further, at the front end of the ram body 7a, a horizontal main shaft 6 to which a tool T is detachably mounted at the tip is rotatably supported by a plurality of bearings.
It is configured to be rotationally driven by a motor (not shown) provided coaxially.

By the way, as shown in FIG. 12, the tip of the ram 7 is inserted into the circular through hole _5a1 formed in the front plate portion 5a of the Y slide 5, and the spindle 6 having the tool T mounted thereon Each of the guides G ₃ has a box frame portion 5b of the Y slide 5, and the guide frame G ₃ protrudes to the front processing area.
The ram 7 is supported so as to be slidable in the Z-axis direction with respect to the Y slide 5 while being engaged with the rails R ₃ and R ₃ laid inside the ram driving linear motor mover L _3b. It is made to oppose to the corresponding linear motor stator L _3a provided at 5 with a predetermined gap.

Further, an annular seal for externally fitting the cylindrical outer peripheral portion of the tip of the ram 7 is arranged at the inner peripheral edge portion on the front surface side of the through hole _5a1 of the Y slide to prevent chips from entering the Y slide 5. It is prevented. Instead of the above seal, air may be constantly ejected from the inner circumference of the through hole.

A linear scale for position detection is provided in parallel with the linear motor on each of the slides and rams, and each linear scale for position detection is connected to the NC device by a cable together with each linear motor mover. N above
The C device drives the axis by controlling the current supplied to each axis linear motor mover based on the position detection signal of the linear scale.

Next, the operation of the machine tool configured as described above will be described.

When current is supplied to the upper and lower linear motor movers L _1b and L _1b fixed to the back surface of the X-slide 4, the front surface of the vertical bed 1 is opposed to the linear motor movers L _1b and L _1b. Linear motor stators L _1a , L fixed to the
Is generated in the longitudinal direction of the thrust between the _1a, rail R _1a laid on a vertical bed 1, X slide 4 along the R _1b is X
Driven in the axial direction.

When current is supplied to the linear motor movers L _2b and L _2b fixed to the motor mounting plates 5d and 5d, the vertical column of the X slide 4 faces the movers L _2b and L _2b. The thrust in the longitudinal direction is generated between the linear motor stators L _2a and L _2a fixed to the outer surfaces of the portions 4b and 4b, and the rails R ₂ and R laid on the front surface of the X-slide 4 are generated.
_The Y slide 5 is driven in the Y-axis direction along the line ₂ .

Further, counterbalance cylinders 10 and 1 pivotally attached to the L-shaped motor mounting plates 5d and 5d of the Y slide 5 and the X slide 4 via brackets 9 and 11, respectively.
Air of a constant pressure is supplied to the bore of 0, and the Y slide 5 is moved to Y through the cylinder rod 10a and the bracket 9.
It always pushes upward in the axial direction, and acts to cancel the gravity acting on the Y slide 5. This makes it possible to reduce the size of the motor without requiring excessive thrust to the linear motor L _{2 including the} linear motor stator L _2a and the mover L _2b during the Y slide raising drive, and when the movement is stopped. Since it is not necessary to constantly supply a large amount of current, heat generation of the motor can be reduced, and further, even when the power supply to the linear motor L ₂ is stopped, the Y slide 5 does not drop.

Moreover, since the counter balance cylinders 10 are mounted on the rear surface of the linear motor L ₂ , the motor drive position and the gravity support position are the same,
No couple force acts on the Y slide 5. Also, a motor mounting plate 5 for driving the Y slide 5 in the Y axis direction.
d and 5d are the Y-shaped front plate portion 5a in the front of the Y slide and Y
Since it is fixed to the side of the box in the center of the slide,
The driving force acts on a position close to the center of gravity of the Y slide 5,
The couple acting on the Y slide 5 at the time of driving can be reduced, and the vibration generated at the time of starting and stopping can be minimized.

When a current is supplied to the linear motor movers L _3b and L _3b fixed to both side surfaces of the rectangular box portion 7c above the ram body, a Y slide arranged to face the mover. The thrust is generated in the longitudinal direction with respect to the linear motor stator L _3a inside the ram 7, and the ram 7 is inserted into the boxes 5f and 5f in the Y slide.
It is driven in the Z-axis direction following the rails R ₃ and R ₃ laid on the.

When the ram 7 is driven, a thrust force in the longitudinal direction is generated between the linear motor movers L _3b and L _3b and the stators L _3a and L _3a, and several times that thrust force and a suction force are applied. Acting at the same time, the U-shaped box frame part 5b of the Y slide 5
Of it is deformed acts to closing the lower opening, minimizing the deformation of the box frame portion 5b of the Y slide by the arrangement and mounting the spacing between the guide G ₃ to match the length of the linear motor moving element You can

The ram 7 has a rectangular box portion 7 on the upper rear side.
c is provided and the linear motor movers L _3b and L _3b are attached to the box portion, so that the ram protruding from the through hole 5 _a1 provided in the center of the rectangular front plate portion 5a of the Y slide 5 to the processing area. The outer diameter can be reduced by forming the tip portion into a cylindrical shape, and thus the accessibility to the workpiece can be improved. Further, since it is a cylindrical shape, chips are less likely to accumulate on the upper part and sealing is easy. Therefore, by providing a cover for separating the machining area and the machine area on the front surface of the Y-slide, the machine area for chips and cutting oil can be easily transferred. Can be prevented. Further, even if cutting oil or cutting chips enter, the linear motor of the Y-slide is arranged at the upper part, so that it can be prevented from entering the inside of the motor.

The L-shaped motor mounting plate 5 of the liners 8 and 12 and the Y-slide 5 interposed between the sliders L _1b and L _3b of the linear motor of the X slide 4 and the ram 7 and their mounting surfaces.
By constantly flowing cooling oil whose temperature is controlled in synchronization with the machine body temperature or the outside air temperature to the cooling oil passages provided in d, the slides generated by the heat generated by the movers L _1b , L _2b , and L _3b. It is possible to prevent thermal displacement of the.

In the above embodiment, two linear motors are used in parallel for each axis feed drive to secure thrust, and a lightweight material (for example, aluminum alloy) is used for the driven parts ram, Y slide and X slide. ) Is used to reduce the inertia, the feed rate and acceleration can be improved.

In the above embodiment, the hybrid linear pulse motor is used as the linear motor. However, the linear motor is not limited to this. For example, a synchronous linear motor or an induction linear motor may be used. . Further, in the present embodiment, the Y slide 5 is shown to slide along the two vertical column portions 4b on the left and right, but it may slide along one vertical column.

In the above embodiment, the rectangular box portion 7c of the ram 7 is used.
The case where the linear motor mover L _3b is arranged on the side has been described, but the present invention is not limited to this, and on the contrary, a stator is arranged in the box part and a mover is arranged in the box frame part of the Y slide 5. Good. It is more advantageous to place a mover on the ram side in order to shorten the ram and make it lighter, but by arranging the stator on a ram that moves frequently, it is necessary to provide a power line to the ram and cooling oil piping. It is possible to solve problems such as disconnection and oil leakage.

[0047]

As described above, according to the present invention, the protrusion is provided on the rear portion of the ram and the linear motor's mover or stator is provided on the protrusion. Can be reduced, and the accessibility to the workpiece can be improved. Further, since the linear motor is arranged above the ram as described above, even if cutting oil or cutting chips enter the ram support portion side, they do not enter the inside of the linear motor. The reliability can be improved. Furthermore, since the linear motor is not directly mounted on the ram body but is mounted above the ram, it is possible to prevent the ram from being thermally deformed and improve the machining accuracy.

Further, guide mounting portions which are symmetrical with respect to the surface including the shaft center are formed on both side surfaces of the rear portion of the ram so as to project, and the guide mounting portions engage with the rails provided on the ram support member. When the above is provided, the ram support member can be prevented from being deformed due to the suction force generated by the operation of the linear motor, and the gap between the stator and the mover of the linear motor can always be kept constant.

Further, the cylindrical shape of the ram facilitates the sealing between the machining area and the machine area, and prevents chips and the like from accumulating on the upper part, preventing the chips and the like from entering the machine area. It can be surely prevented.

Further, when the protrusion for mounting the linear motor moving element is formed in a hollow box shape, air can be circulated in the protrusion and the cooling effect of the linear motor can be increased.

[Brief description of drawings]

FIG. 1 is a perspective view of an entire front surface showing an embodiment of a machine tool of the present invention.

FIG. 2 is a rear perspective view of the machine tool of FIG.

FIG. 3 is a front perspective view of a vertical bed of the machine tool of the present invention.

4 is a rear perspective view of the vertical bed of FIG.

FIG. 5 is a front perspective view of the X slide.

FIG. 6 is a rear perspective view of the X slide.

FIG. 7 is a front perspective view of a Y slide.

FIG. 8 is a rear perspective view of the Y slide.

FIG. 9 is a partial cross-sectional view showing a state where the Y slide is attached to the X slide.

FIG. 10 is a side view of FIG. 9;

FIG. 11 is a front perspective view of a Z slide.

FIG. 12 is a rear perspective view showing a state in which the Z slide is attached to the Y sillad.

[Explanation of symbols]

1 vertical bed 3 table 4 X slide 4a through hole 4b vertical column part 4c horizontal girder part 5 Y slide 5a front plate part 5b box frame part 5c Y slide body part 5d motor mounting plate 5e frame part 6 spindle 7 ram 7a ram body 7b Guide mounting part 10 Counterbalance cylinder G _1a , G _1b , G ₂ , G ₃ guide R _1a , R _1b , R ₂ , R ₃ rail L _1a , L _2a , L _3a Linear motor stator L _1b , L _2b , L _3b linear motor mover

 ─────────────────────────────────────────────────── ─── Continuation of front page (71) Applicant 000005326 Honda Motor Co., Ltd. 2-1-1 Minami-Aoyama, Minato-ku, Tokyo (71) Applicant 000002059 Shinko Electric Co., Ltd. 3--12-2, Nihonbashi, Chuo-ku, Tokyo (71) Applicant 000006013 Mitsubishi Electric Co., Ltd. 2-3-3 Marunouchi, Chiyoda-ku, Tokyo (72) Inventor Toru Yagami 106 Mt. Kita-Goriyama-cho, Yamatokoriyama-shi, Nara Mori Seiki Co., Ltd. (72) Inventor Masayori Ito 3-2068 Ooka, Numazu-shi, Shizuoka Prefecture Numazu Works, Toshiba Machine Co., Ltd. (72) Inventor Katsuhito Endo 3-2068 Ooka, Numazu City, Shizuoka Prefecture Numazu Works, Toshiba Machine Co., Ltd. (72) Inventor Fujiwara Akihiko 1 Tatsumi Uzumasa-cho, Ukyo-ku, Kyoto City, Kyoto Prefecture Mitsubishi Heavy Industries, Ltd. Kyoto Seiki Works (72) Inventor Naoya Matsunaga Right Kyoto City, Kyoto Prefecture No. 1 Uzumasa-cho, Ku Mitsubishi Heavy Industries, Ltd.Kyoto Seiki Co., Ltd. (72) Inventor Takao Nakagawa 8-10 Kita Itami, Itami City, Hyogo Prefecture In-house company of Osaka Kiko Co., Ltd. (72) Inventor Honda, Itami City, Hita Prefecture 8-10 Osaka Kiko Co., Ltd. (72) Inventor Jun Tori, 1-10-1 Shin-Sayama, Sayama City, Saitama Prefecture, Honda Engineering Co., Ltd. (72) Inventor, Mitsuji Kanda 100 Takegahana-cho, Ise-shi, Mie 100 Shinko Electric Company Stock (72) Inventor Hiroshi Nakagawa 100 Takegahana Town, Ise City, Mie Prefecture Shinko Electric Co., Ltd. (72) Inventor Torao Takeshita 2-3-3 Marunouchi, Chiyoda-ku, Tokyo Sanryo Electric Co., Ltd.

Claims (5)

[Claims] 1. A machine tool in which a ram rotatably supporting a horizontal main shaft is supported by a ram support member so as to be capable of advancing and retracting in the axial direction of the ram.
The mover or stator of the linear motor is mounted on the protrusion, and the stator or the linear motor of the linear motor is mounted on the ram support member corresponding to the mover or the stator of the linear motor mounted on the protrusion. A machine tool characterized by having a mover. 2. The protrusion provided on the rear portion of the ram has a plane symmetrical with respect to the plane including the ram axis, and a moving element or a stator of the linear motor is mounted on each of the symmetrical surfaces. The machine tool according to claim 1, wherein: 3. A guide mounting portion, which is bilaterally symmetric with respect to a surface including the ram axis, is formed on both side surfaces of a rear portion of the ram so as to project therefrom.
The machine tool according to claim 1 or 2, wherein a guide engaging with a rail provided on the ram support member is fixed to the guide attachment portion. 4. The machine tool according to claim 1, wherein the ram has a cylindrical shape. 5. The machine tool according to claim 1, wherein the protrusion is formed in a hollow box shape.