JP4735162B2 - Structure of sliding body in machine tool - Google Patents

Description

  The present invention relates to a structure of a sliding body of a machine tool, and more particularly to a structure of a sliding body that is advanced and retracted by a linear motor.

2. Description of the Related Art Conventionally, in a machine tool having a sliding body that is advanced and retracted by a linear motor, the inside of the sliding body is hollowed in order to improve both the advance / retreat speed (acceleration) of the sliding body and the rigidity of the sliding body. It is formed in a shape to reduce the mass and is reinforced by providing a rib member at an appropriate position.
Here, the prior art described in Patent Document 1 is shown in FIGS.
FIG. 4 shows a diagram in which members around the sliding body 10 are extracted from the machine tool having the sliding body 10 that is advanced and retracted by the linear motor 40. In this example, an example of a machine tool having a rotating grindstone is shown. Show. 5A shows a cross-sectional view along the line AA in FIG. 4, and FIG. 5B shows a diagram of another embodiment with respect to FIG. 5A. 6A shows a view of the main body 11 extracted from FIG. 5A (the oil passage to the static pressure pocket is not shown), and FIG. 7 shows a bottom view of the sliding body 10. Yes.
In the example shown in FIG. 4, the sliding body 10 (in this case, the grindstone base) includes a main body portion 11 and a bearing unit 13 fixed to an L-shaped mounting surface 11 </ b> D formed at the front portion of the main body portion 11. , Can move forward and backward in the Z-axis direction.
The bearing unit 13 rotatably supports the grindstone shaft 14 on a horizontal axis (X-axis) orthogonal to the advancing / retreating direction (Z-axis direction) of the sliding body 10. The grindstone shaft 14 is coupled to an output shaft of a grindstone drive motor (not shown) at one end on the back side in FIG. 4, and the grindstone G is fixed to the other end on the near side. In the state of FIG. 4 in which the sliding body 10 has advanced, the center support is provided so that the workpiece support device is composed of a headstock (not shown) and a tailstock (not shown) and is rotated on a horizontal axis parallel to the grindstone shaft 14. A grinding wheel G is grinding a workpiece W (in this example, a camshaft) which is a workpiece.
The linear motor 40 is disposed on the lower surface of the main body 11 and includes an electromagnetic coil unit 41 and a permanent magnet unit 42.
For example, when the machine tool is a cam grinder, the main body portion 11 moves forward (operation in the direction in which the main body portion 11 approaches the workpiece W in FIG. 4) and reverse movement (main body portion in FIG. 4) in synchronization with the rotation of the workpiece W. 11 is repeatedly executed at a high acceleration. For this reason, the main body 11 is required to be lightweight and have high rigidity.
In the main body 11, a plurality of partition walls 11M extending in the width direction are arranged at predetermined intervals in the advancing and retreating direction, and between the adjacent partition walls 11M and between the front wall 11F and the rear wall 11B and the adjacent partition wall 11M. A substantially box-shaped space 11S is formed to reduce weight and increase rigidity.

As shown in FIG. 5A, the main body 11 has a pair of horizontal guide members 20 having a rectangular cross section that is spaced apart in the horizontal direction (X-axis direction) perpendicular to the advance / retreat direction (Z-axis direction) and extends in the advance / retreat direction. Above, it is slidably guided. A pair of leg portions 11K is suspended from the lower surfaces of both side portions of the main body portion 11, and sandwiching plates 21 are fixed to the lower ends of the respective leg portions 11K, and the U-shaped space that opens outwardly by the leg portions 11K and the sandwiching plates 21. Is formed over the entire length (advancing and retracting direction) of the main body part 11, and the main body part 11 is moved in the horizontal direction (advancing and retreating direction) by fitting the horizontal guide members 20 into the U-shaped spaces with predetermined gaps. )
Further, the inner side surface of the sandwiching plate 21 faces the both side surfaces of the linear guide member 22 with a predetermined gap. The pair of horizontal guide members 20 and linear guide members 22 are set to a length obtained by adding substantially the entire length of the main body 11 in the advance / retreat direction and the advance / retreat stroke ST (see FIG. 4), and are fixed to the base 26 fixed to the bed 25. Has been. A plurality of static pressure pockets 31 are symmetrically arranged on the inner surface of each sandwich plate 21 over the entire length of the sandwich plate 21, and each static pressure pocket 31 is operated through a throttle hole (not shown). Oil is supplied. Further, on one side of the sliding body 10 where the grinding wheel G is disposed, the linear scale 51 is supported by the base 26 via the bracket 52, and the advance / retreat position is detected by the read head 53 fixed to the main body 11. .
Further, as shown in FIG. 7, static pressure pockets 27 are arranged in the forward and backward direction on the downward guide surface facing the upper surface of the horizontal guide member 20 in the sliding body 10, and hydraulic oil is supplied to each static pressure pocket 27. A throttle hole 28 is provided. Similarly, static pressure pockets 29 are arranged in an advancing and retreating direction on the upward guide surface facing the lower surface of the horizontal guide member 20 in the sandwich plate 21, and each static pressure pocket 29 is provided with a throttle hole (illustrated) for supplying hydraulic oil. (Omitted) is provided.

In each box-shaped space 11S, a pair of rib members 11R extending in the advancing and retreating direction of the main body 11 and integrally coupled to the front wall 11F, the rear wall 11B, and the partition wall 11M are provided. As shown in FIG. 6A, in the cross section in the width direction of the main body part 11, the pair of rib members 11R starts from the lower surface part of the main body part 11 and opens to the outside to be integrally coupled to the ceiling surface. By arranging the rib members 11R in an inclined manner in this way, an inverted trapezoidal space 11V is formed at the center of the cross section in the width direction of the main body 11, and triangular spaces 11T are formed on both sides of the inverted trapezoidal space 11V. . The inverted trapezoidal space 11V has the highest central portion in the width direction on the ceiling surface of the space, and has a surface inclined downward from the highest portion toward both sides, and is precisely a hexagonal space. Yes.
Further, the pair of leg portions 11K are suspended downward from the portions forming the triangular space 11T.
As shown in FIG. 6B, a combined force F of the weight of the sliding body 10 and the suction force of the linear motor 40 is applied to the lower surface of the sliding body 10, and when the lower surface is deformed by the combined force F, a pair of A force is received in the direction in which the leg 11K opens. In order to face the force in the opening direction, the rib member 11R is provided so as to form the triangular space 11T and the inverted trapezoidal space 11V.

5B shows an example in which the linear guide member 22 is omitted from the cross-sectional view shown in FIG. In this example, instead of the static pressure pocket 31 provided in the sandwiching plate 21 in FIG. 5A, a static pressure pocket 131 is provided in the leg portion 11K.
JP 2001-198815 A

In the prior art described in Patent Document 1, the necessary rigidity can be ensured with respect to the combined force F due to the suction force of the linear motor 40 at that time, and the deformation amount of the sliding body 10 is also small.
However, in recent years, the performance of the linear motor 40 has improved, and it has become possible to perform machining at a higher acceleration in a shorter time. However, when machining is performed at a higher acceleration by the linear motor 40 with improved performance, the combined force F increases with a stronger suction force, and vibration such as chatter may occur in the sliding body 10. If vibration such as chatter is generated on the sliding body 10, the processing accuracy is affected.
The present invention has been made in view of such a point, and an object thereof is to provide a structure of a sliding body in a machine tool having higher rigidity.

As means for solving the above-mentioned problems, a first invention of the present invention is a structure of a sliding body in a machine tool as described in claim 1.
The structure of the sliding body in the machine tool according to claim 1, wherein a pair of horizontal guide members for guiding the sliding body so as to advance and retreat are provided on the base so as to be spaced apart in parallel, and an electromagnetic coil unit and a permanent magnet unit of the linear motor In the structure of the sliding body in a machine tool in which one of the sliding body is fixed to the lower surface of the sliding body and the other is fixed to the upper surface of the base, the sliding body has a rectangular parallelepiped shape whose longitudinal direction is the advancing and retreating direction; A pair of legs provided on the lower surface of the main body along the advancing / retreating direction and suspended so as to face the opposed inner surfaces of the pair of horizontal guide members;
And in the cross section perpendicular to the advancing / retreating direction of the main body, the inside of the main body is hollow, and is inclined outward so as to form a first triangular space having one side as a side surface of the main body. In addition, a pair of first rib members that connect the upper surface of the main body portion and the bottom surface of the main body portion are provided along the longitudinal direction inside the main body portion.
Further, in the cross section perpendicular to the advancing and retreating direction in the main body portion, the pair of leg portions are disposed below the first triangular space, adjacent to the first triangular space, and the first rib member. A pair of second rib members connecting the upper surface of the main body portion and the bottom surface of the main body portion substantially perpendicularly to the bottom surface of the main body portion so as to form a second triangular space having one side as Provided along the longitudinal direction inside the main body.

A second invention of the present invention is a structure of a sliding body in a machine tool as described in claim 2.
In the structure of the sliding body in the machine tool according to claim 2, a pair of horizontal guide members for guiding the sliding body so as to freely advance and retract are provided on the base so as to be spaced apart in parallel, and the electromagnetic coil unit and the permanent magnet unit of the linear motor are provided. In the structure of the sliding body in the machine tool in which one is fixed to the lower surface of the sliding body and the other is fixed to the upper surface of the base, the sliding body has a body portion having a polygonal column shape whose longitudinal direction is the advancing and retreating direction; A pair of legs provided on the lower surface of the main body along the advancing / retreating direction and suspended so as to face the opposed inner surfaces of the pair of horizontal guide members;
And in the cross section perpendicular to the advancing and retreating direction in the main body, the inside of the main body is hollow, and the polygonal columnar shape is such that the upper surface of the main body is parallel to the bottom of the main body, A pair of first side surfaces are provided so as to incline toward the inside of the main body portion from both ends of the bottom surface of the main body portion toward a predetermined height position lower than the upper surface of the main body portion, and the first side surface portion The first side surface portion and the upper surface of the main body portion are inclined from the predetermined height position toward the upper surface of the main body portion with an inclination that is gentler than the inclination of the first side surface portion. It has a pair of 2nd side part to connect.
Further, in the cross section perpendicular to the advancing and retreating direction of the main body portion, the main body portion is inclined outwardly so as to form a first triangular space having the first side surface portion as one side, and the predetermined height of the first side surface portion is increased. A pair of first rib members that connect the vertical position and the bottom surface of the main body are provided along the longitudinal direction inside the main body.
Further, in the cross section perpendicular to the advancing and retreating direction in the main body portion, the pair of leg portions are arranged in a lower portion of the first triangular space, and from the connection portion between the second side surface portion and the upper surface of the main body portion, A pair of second rib members for connecting the upper surface of the main body portion and the bottom surface of the main body portion are provided in the main body portion along the longitudinal direction substantially perpendicularly to the bottom surface of the main body portion.

According to a third aspect of the present invention, there is provided a sliding body structure in a machine tool according to the third aspect.
The structure of the sliding body in the machine tool according to claim 3 is the structure of the sliding body in the machine tool according to claim 2, wherein the bottom surface of the main body portion is a cross section perpendicular to the advancing and retreating direction of the main body portion. The first side surface portion and the second side surface portion are arranged along an arc centered at a position on the inner side from the end of the bottom surface of the main body portion by a distance of the radius, with a distance between the upper surface of the main body portion and the upper surface of the main body portion Has been.

According to a fourth aspect of the present invention, there is provided a sliding body structure in a machine tool as set forth in the fourth aspect.
The structure of the sliding body in the machine tool according to claim 4 is the structure of the sliding body in the machine tool according to claim 2 or 3, wherein the first vertical section of the main body section is perpendicular to the advancing / retreating direction. The thickness of the side surface portion and the first rib member is made thicker than the upper surface of the main body portion, the second side surface portion, and the second rib member.

A fifth aspect of the present invention is the structure of the sliding body in the machine tool as described in the fifth aspect.
The structure of the sliding body in the machine tool according to claim 5 is the structure of the sliding body in the machine tool according to claim 2 or 3, wherein the main body portion has a cross section perpendicular to the advancing and retreating direction in the main body portion. A portion of the first triangular space surrounded by the bottom surface, the first side surface portion, and the first rib member is filled without forming a hollow shape.

In the structure of the sliding body in the machine tool according to claim 1, as shown in the example of FIG. 1, the pair of first rib members 61 </ b> A and the second ribs are provided inside the body portion 61 having a rectangular parallelepiped shape (hollow shape). The rigidity of the main body 61 is further increased by providing the member 61B at an appropriate position.
With the structure of the main body 61 (sliding body structure), a sliding body having higher rigidity can be obtained.

Further, in the structure of the sliding body in the machine tool according to claim 2, as shown in the example of FIG. 2A, the bottom surface 61D, the top surface 61U, the first side surface portion 61M, and the second side surface portion 61N are polygonal columns. The rigidity of the main body 61 is further increased by providing the pair of first rib members 61A and second rib members 61B at appropriate positions inside the main body 61 configured in a shape (hollow shape).
With the structure of the main body 61 (sliding body structure), a sliding body having higher rigidity can be obtained.

Moreover, the structure of the sliding body in the machine tool according to claim 3 is the same as that of the sliding body in the machine tool according to claim 2, as shown in the example of FIG. A first side surface portion 61M and a second side surface portion 61N are arranged along an arc R having a radius r centering on a position P inside from the end of the bottom surface 61D by a distance r.
Thereby, the inclination angle and the length of the first side surface portion 61M and the second side surface portion 61N can be set more appropriately, and a sliding body having higher rigidity can be obtained.

  The structure of the sliding body in the machine tool according to claim 4 is the same as that of the sliding body in the machine tool according to claim 2 or 3 from the example shown in FIG. By increasing the thickness of the 1 rib member 61A, a sliding body having higher rigidity can be obtained.

  Further, the structure of the sliding body in the machine tool according to claim 5 is the same as the structure of the sliding body in the machine tool according to claim 2 or 3 from the example shown in FIG. By adopting a structure in which the portion of the first triangular space 61T surrounded by 61M and the first rib member 61A is filled without forming a hollow shape, a sliding body having higher rigidity can be obtained.

The best mode for carrying out the present invention will be described below with reference to the drawings.
FIG. 1 shows an example of a cross-sectional view of a main body 61 for explaining a first embodiment of a structure of a sliding body in a machine tool of the present invention. FIG. 2 (A) shows a machine tool of the present invention. The example of sectional drawing of the main-body part 61 for demonstrating 2nd Embodiment of the structure of the sliding body in a machine is shown.
Note that in the cross-sectional views shown in FIGS. 1, 2A, and 2B, an oil passage that supplies hydraulic oil to the static pressure pocket is omitted. Further, the static pressure pocket for keeping the horizontal gap may be provided on the inner side surface 71M of the sandwiching plate 71 or may be provided on the outer side surface 62G of the leg portion 62.
Further, in the structure of the sliding body in the machine tool of the present invention, the machine tool is provided with a pair of horizontal guide members 20 for guiding the sliding body so as to be able to advance and retreat in a manner spaced apart in parallel on the base 26. Further, the electromagnetic coil unit 41 of the linear motor 40 is fixed to the lower surface of the sliding body, and the permanent magnet unit 42 of the linear motor 40 is fixed to the upper surface of the base 26.

[First embodiment (FIG. 1)]
FIG. 1 shows a cross section perpendicular to the advancing / retreating direction (Z-axis direction) in a sliding body of a machine tool.
In the first embodiment, the sliding body is provided along the advancing / retreating direction on the lower surface of the main body 61 and a main body 61 having a substantially rectangular parallelepiped shape whose inside is a hollow in the advancing / retreating direction. A pair of legs 62 is provided so as to hang down so as to face the opposed inner side surfaces of the horizontal guide member 20. A sandwich plate 71 is provided below each leg portion 62, and a U-shaped sandwiching portion 62 </ b> K formed by the bottom surface 61 </ b> D, the leg portion 62, and the sandwich plate 71 is fitted to the horizontal guide member 20. .
As shown in FIG. 1, the cross section of the main body 61 has an upper surface 61U, a side surface 61L, and a bottom surface 61D. A pair of first rib members 61A are provided in the main body 61 along the longitudinal direction so as to form a first triangular space 61T having the side surface 61L as one side.
The first rib member 61A is inclined outward and connects the upper surface 61U and the bottom surface 61D, and the upper end is connected to a connection portion between the upper surface 61U and the side surface 61L.

The pair of leg portions 62 are disposed below the bottom surface 61D and below the first triangular space 61T.
A pair of second rib members 61B that are substantially perpendicular to the bottom surface 61D are provided in the main body 61 along the longitudinal direction.
The second rib member 61B connects the upper surface 61U and the bottom surface 61D to form a second triangular space 61S. The second triangular space 61S is adjacent to the first triangular space 61T, and has the first rib member 61A as one side and the second rib member 61B as one side. As a result, a rectangular space 61 </ b> V is formed at the center of the main body 61.
Further, the electromagnetic coil unit 41 (or the permanent magnet unit 42) is fixed from the upper or lower portion of the second rib member 61B (from the upper portion in the example of FIG. 1) with bolts. As long as one of the electromagnetic coil unit 41 and the permanent magnet unit 42 of the linear motor 40 is fixed to the lower surface of the sliding body 10 and the other is fixed to the upper surface of the base 26, either may be fixed to the lower surface of the sliding body 10. .
The second rib member 61B (vertical rib) is a position where the electromagnetic coil unit 41 (or the permanent magnet unit 42) is bolted and is a position where force acts.

  In the first embodiment, the cross section is simplified to a rectangular parallelepiped shape with respect to FIG. 6A showing the structure of the conventional main body, and a pair of second rib members 61B is added. Different. In 1st Embodiment, while making the main-body part 61 into the external shape (cuboid shape) which is easier to shape | mold, rigidity is improved more conventionally than in the 2nd rib member 61B.

[Second Embodiment (FIGS. 2A, 2B)]
FIG. 2A shows a cross section perpendicular to the advancing / retreating direction (Z-axis direction) in the sliding body of the machine tool.
In the second embodiment, the sliding body is provided along the advancing / retreating direction on the lower surface of the main body 61 and the main body 61 having a hollow polygonal interior with the advancing / retreating direction as the longitudinal direction. A pair of legs 62 is provided so as to hang down so as to face the opposed inner side surfaces of the horizontal guide member 20. A sandwich plate 71 is provided below each leg portion 62, and a U-shaped sandwiching portion 62 </ b> K formed by the bottom surface 61 </ b> D, the leg portion 62, and the sandwich plate 71 is fitted to the horizontal guide member 20. .
As shown in FIG. 2A, the cross section of the main body 61 has a top surface 61U, a bottom surface 61D, a pair of first side surface portions 61M, and a pair of second side surface portions 61N.
Further, the bottom surface 61D and the upper surface 61U are parallel to each other, and are inclined inward of the main body 61 from the both ends of the bottom surface 61D to a position having a predetermined height H lower than the upper surface 61U (inclination angle θ1 in FIG. 2A). A pair of first side surface portions 61M is provided so as to achieve this. The second side surface portion 61N is inclined more gently than the inclination (inclination angle θ1) of the first side surface portion 61M from the position (upper end) of the predetermined height H of the first side surface portion 61M toward the upper surface 61U (see FIG. The first side surface portion 61M and the upper surface 61U are connected to each other at an inclination angle θ2) of 2 (A).

Inside the main body 61, a pair of first rib members 61A are provided along the longitudinal direction so as to form a first triangular space 61T having the first side surface 61M as one side. The first rib member 61A is inclined outward and connects the position (upper end) of the predetermined height H of the first rib member 61M and the bottom surface 61D.
The pair of leg portions 62 is disposed below the bottom surface 61D and below the first triangular space 61T.
A pair of second rib members 61B that are substantially perpendicular to the bottom surface 61D are provided in the main body 61 along the longitudinal direction.
The second rib member 61B connects the connection portion between the upper surface 61U and the second side surface portion 61N and the bottom surface 61D to form a second triangular space 61S. The second triangular space 61S is a space adjacent to the first triangular space 61T and surrounded by the first rib member 61A, the second side surface portion 61N, and the second rib member 61B. As a result, a rectangular space 61 </ b> V is formed at the center of the main body 61.
Further, the electromagnetic coil unit 41 (or the permanent magnet unit 42) is fixed from the upper or lower portion of the second rib member 61B (from the upper portion in the example of FIG. 2A) with bolts. As long as one of the electromagnetic coil unit 41 and the permanent magnet unit 42 of the linear motor 40 is fixed to the lower surface of the sliding body 10 and the other is fixed to the upper surface of the base 26, either may be fixed to the lower surface of the sliding body 10. .
The second rib member 61B (vertical rib) is a position where the electromagnetic coil unit 41 (or the permanent magnet unit 42) is bolted and is a position where force acts.

  In 2nd Embodiment, with respect to FIG. 6 (A) which shows the structure of the conventional main-body part, the 1st side part 61M inclines inside, and a pair of 2nd rib member 61B is added. The point is different. As a result, the rigidity is further improved as compared with the prior art.

The inclination and length of the first side surface portion 61M and the second side surface portion 61N will be described with reference to FIG.
When a distance r between the bottom surface 61D and the top surface 61U is a distance r, and an arc R having a radius r centered on a position P that is a distance r from the end of the bottom surface 61D is drawn, the first side surface portion along the arc R It is preferable to set the inclination and length of the first side surface portion 61M and the second side surface portion 61N so that the 61M and the second side surface portion 61N are positioned, because the rigidity is further improved. The position P is the position of the bolt hole of the bolt that fixes the electromagnetic coil unit 41, and the bolt hole of the bottom surface 61D (the bolt hole of the second rib member 61B) and the bolt hole of the electromagnetic coil unit 41 abut. Position.
The first rib member 61A is disposed along the radius of the arc R centered at the position P. The position P is a position to which a force due to the suction force of the linear motor 40 is applied.
Further, when the thickness T1 of the first rib member 61M and the thickness T2 of the first side surface portion 61M are made thicker than the thicknesses of the upper surface 61U, the second side surface portion 61N, and the second rib member 61B, the rigidity is further increased. Since it improves, it is preferable.

● [Third embodiment]
In the third embodiment, a structure in which the first triangular space 61T is filled without forming a hollow shape is used as compared with the second embodiment shown in the example of FIG. That is, from the second embodiment, the thickness of the first side surface portion 61M and the thickness of the first rib member 61A are made as thick as possible (not shown).

● [Effects of the first to third embodiments]
Next, the result confirmed about the effect by the 1st-3rd embodiment is demonstrated using FIG. FIG. 3 shows the suction force of the linear motor with respect to the conventional structure, the structure of the first embodiment, the structure of the second embodiment, and the structure of the third embodiment. The graph which measured each deformation amount (opening amount of a pinch board) at the time of generating is shown.
From the graph shown in FIG. 3, it can be confirmed that the rigidity of each of the first to third embodiments is improved more than the conventional structure.

The structure of the sliding body in the machine tool of the present invention is not limited to the appearance and configuration described in the present embodiment, and various modifications, additions, and deletions can be made without departing from the scope of the present invention.
In the description of the present embodiment, the example of the sliding body having the linear motor feed static pressure slide structure in the machine tool provided with the rotating grindstone has been described, but various machine tools provided with the sliding body that is slid by the linear motor. It is possible to apply to the sliding body.
In the description of the present embodiment, the example of the static pressure slide has been described, but the present invention can also be applied to an LM guide (linear motion (linear motion) guide).

In the structure of the sliding body in the machine tool of this invention, it is sectional drawing explaining 1st Embodiment. In the structure of the sliding body in the machine tool of this invention, it is sectional drawing explaining 2nd Embodiment. It is a graph explaining the effect by the 1st-3rd embodiment. It is the figure which extracted the member around the sliding body 10 from the conventional machine tool which has the sliding body 10 advanced / retreated by the linear motor 40. FIG. It is AA sectional drawing (A) in FIG. 4, and sectional drawing (B) of another example. It is the figure which extracted the main-body part 11 from FIG. 5 (A) (The oil path etc. to a static pressure pocket are abbreviate | omitting illustration). It is a bottom view of the sliding body 10 shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Sliding body 11 Main-body part 11K Leg part 11T 1st triangular space 20 Horizontal guide member 21 Clip board 22 Linear guide member 26 Base 25 Bed 40 Linear motor 41 Electromagnetic coil unit 42 Permanent magnet unit 61 Main-body part 61A 1st rib member 61B Second rib member 61T First triangular space 61S Second triangular space 61U Upper surface 61D Bottom surface 61L Side surface 61M First side surface portion 61N Second side surface portion 62 Leg portion 71 Clipping plate

Claims (5)

A pair of horizontal guide members for guiding the sliding body so as to freely advance and retract are provided on the base so as to be spaced apart in parallel.
In the structure of the sliding body in the machine tool in which one of the electromagnetic coil unit and the permanent magnet unit of the linear motor is fixed to the lower surface of the sliding body and the other is fixed to the upper surface of the base,
The sliding body is
A main body having a rectangular parallelepiped shape with the advancing / retreating direction as the longitudinal direction;
A pair of legs provided along the advancing and retreating direction on the lower surface of the main body, and hanging down so as to face the opposed inner surfaces of the pair of horizontal guide members;
In a cross section perpendicular to the advance / retreat direction in the main body,
The inside of the main body is hollow,
A pair of first rib members that incline outward and connect the upper surface of the main body and the bottom surface of the main body so as to form a first triangular space having one side as a side surface of the main body, Provided along the longitudinal direction inside the main body,
The pair of legs are arranged at the bottom of the first triangular space,
The main body portion is substantially perpendicular to the bottom surface of the main body portion so as to be adjacent to the first triangular space and to form a second triangular space having the first rib member as one side. A pair of second rib members for connecting the upper surface and the bottom surface of the main body are provided along the longitudinal direction inside the main body.
A structure of a sliding body in a machine tool characterized by the above. A pair of horizontal guide members for guiding the sliding body so as to freely advance and retract are provided on the base so as to be spaced apart in parallel.
In the structure of the sliding body in the machine tool in which one of the electromagnetic coil unit and the permanent magnet unit of the linear motor is fixed to the lower surface of the sliding body and the other is fixed to the upper surface of the base,
The sliding body is
A main body having a polygonal column shape with the forward / backward direction as the longitudinal direction;
A pair of legs provided along the advancing and retreating direction on the lower surface of the main body, and hanging down so as to face the opposed inner surfaces of the pair of horizontal guide members;
In a cross section perpendicular to the advance / retreat direction in the main body,
The inside of the main body is hollow,
In the polygonal column shape, the upper surface of the main body portion is parallel to the bottom surface of the main body portion, and the main body extends from both ends of the bottom surface of the main body portion toward a predetermined height position lower than the upper surface of the main body portion. A pair of first side surfaces so as to be inclined inward of the first portion, and from the predetermined height position of the first side surface toward the upper surface of the main body, which is gentler than the inclination of the first side surface A pair of second side surface portions that are inclined to the inside of the main body portion and connect the first side surface portion and the upper surface of the main body portion;
A pair of inclining outwards to connect the predetermined height position of the first side surface portion and the bottom surface of the main body portion so as to form a first triangular space having the first side surface portion as one side. A first rib member is provided along the longitudinal direction inside the main body,
The pair of legs are arranged at the bottom of the first triangular space,
A pair of second rib members that connect the upper surface of the main body portion and the bottom surface of the main body portion substantially perpendicularly to the bottom surface of the main body portion from a connection portion between the second side surface portion and the upper surface of the main body portion. Is provided along the longitudinal direction inside the main body,
A structure of a sliding body in a machine tool characterized by the above. The structure of the sliding body in the machine tool according to claim 2,
In a cross section perpendicular to the advance / retreat direction in the main body,
The distance between the bottom surface of the main body portion and the top surface of the main body portion is a radius, and the first side surface portion and the first side portion along an arc centered at a position inside the radius portion from the end of the bottom surface of the main body portion. 2 side parts are arranged,
A structure of a sliding body in a machine tool characterized by the above. The structure of the sliding body in the machine tool according to claim 2 or 3,
In a cross section perpendicular to the advance / retreat direction in the main body,
The first side surface portion and the first rib member are thicker than the upper surface of the main body portion, the second side surface portion, and the second rib member.
A structure of a sliding body in a machine tool characterized by the above. The structure of the sliding body in the machine tool according to claim 2 or 3,
In a cross section perpendicular to the advance / retreat direction in the main body,
A structure in which a portion of the first triangular space surrounded by the bottom surface of the main body portion, the first side surface portion, and the first rib member is filled without forming a hollow shape,
A structure of a sliding body in a machine tool characterized by the above.

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