JP6512930B2 - Machine Tools - Google Patents

Description

  The present invention relates to a machine tool, and more particularly to a machine tool having a horizontally moving moving part.

Conventionally, various moving mechanisms are used in machine tools to move a workpiece to be machined and a machining tool to an arbitrary relative position.
For example, in the support structure of the table on which the work is placed or the support structure of the head on which the tool is mounted, a linear movement mechanism along each axis of X axis, Y axis, and Z axis to enable three-dimensional movement. Is adopted. Also, in order to change the orientation of the table or the head, a rotational movement mechanism is adopted.

These moving mechanisms have two members which move relative to each other (for example, a guide member and a moving member moving along the same), a drive mechanism which moves these two members, accuracy of the moving direction or moving axis (guide accuracy A guide mechanism for securing the
In such a guide mechanism, geometrical accuracy is required that the guide accuracy is high, that is, the linear movement is as straight as possible, and the rotational movement is as perfect as possible. Furthermore, the guide mechanism is required to have high load capacity, low friction, and high damping performance (vibration absorption performance).

In recent years, a hydrostatic pressure guide mechanism has been used as a guide mechanism of a machine tool (Patent Document 1).
In the hydrostatic pressure guide mechanism, a static pressure chamber is formed in one of a pair of sliding surfaces, lubricating oil is supplied to the static pressure chamber, and load transfer is performed between the other sliding surface by the static pressure. Do. That is, only the lubricating oil intervenes on the pair of sliding surfaces, and the pair of sliding surfaces are in non-contact with each other, so that the sliding resistance can be significantly reduced.

  However, the hydrostatic pressure guide mechanism has a limit in damping performance due to the structure of floating by the oil film. In addition, a supply device for supplying a lubricating oil for forming an oil film, and a recovery device for recovering the lubricating oil are required. In particular, in the conventional hydrostatic pressure guide mechanism, it is not possible to discharge the outside air like an aerostatic bearing using air because of the use of lubricating oil. Therefore, the lubricating oil supplied to the static pressure chamber is discharged from the outer peripheral edge to the outside of the guide mechanism. In particular, in the static oil pressure guide mechanism, since the amount of lubricating oil discharged is a huge amount compared to the sliding guide, it is necessary to recover the lubricating oil and return it to the supply device. Therefore, the apparatus configuration and piping associated with the guide mechanism must be complicated.

On the other hand, a traditional slide guide mechanism (dynamic pressure guide mechanism) has been frequently used as a guide mechanism for machine tools (Patent Document 2).
The slide guide mechanism is configured to slide lubricating oil while supplying lubricating oil between a pair of sliding surfaces formed to be smooth. The pair of sliding surfaces are lubricated by the lubricating oil, but maintain solid contact with each other.

The sliding guide mechanism is a sliding guide between a pair of sliding surfaces, so that it is possible to increase the guiding accuracy and the damping performance, and has the feature of being structurally simple. For this reason, a sliding guide mechanism is still frequently used as a guide mechanism for machine tools.
However, the sliding guide mechanism has a small load capacity, a large friction coefficient, and in particular, an increase in the friction coefficient at the time of start up or low speed, so the operation may not be smooth, which may affect the positioning accuracy.

  By the way, in a part of the machine tool, in the support structure of the spindle or head on which the tool is mounted, the weight of the tool itself causes tilting or falling, which affects the machining accuracy. In order to prevent or compensate for such deformation, various measures have been taken in conventional machine tools.

For example, in the support structure of the spindle head, reverse moment applying means for offsetting the moment causing the tilt with respect to the tilt due to the weight of the spindle head is installed in the column, and the moving axis of the column is corrected. There is one that compensates for the inclination (Patent Document 3).
Alternatively, as a support structure of the spindle head, there is a structure in which the spindle head is supported at two positions sandwiching the position of the center of gravity of the spindle head to prevent the spindle head from tilting due to its own weight (Patent Document 4).

JP 2004-58192 A JP, 2008-238397, A Unexamined-Japanese-Patent No. 2007-216319 JP 2012-96313 A

In some machine tools, horizontally moving moving parts are used. Here, the horizontal movement includes not only the case where the movement axis is horizontal but also the case where the movement axis is another direction having a horizontal component.
For example, in a machine tool, a support portion installed on a foundation, a moving portion supported by the support portion, and a moving mechanism for moving the moving portion in the horizontal direction with respect to the support portion are installed. As the movement mechanism, a guide mechanism such as the aforementioned slide guide mechanism or hydrostatic pressure guide mechanism is used.

As a specific example, the horizontal boring machine has a column standing on a bed, a head vertically supported on the column, and a head that can be moved back and forth from the head in order to support a main shaft whose rotation axis extends in the horizontal direction. Use a ram (or quill).
In such a structure, the ram including the main shaft is a moving part to move horizontally, and the head or column is a support part supporting the moving part. And, as a guide mechanism, the aforementioned slide guide mechanism or the like between the outer surface of the ram and the surface of the head opposite to this (the inner side surface of the insertion hole formed in the head for inserting the ram, etc.) An hydrostatic pressure guide mechanism is formed.

The position of the center of gravity of the ram, which is the moving part, changes with respect to the supporting part such as the head along with the movement (advancing / retracting in the direction of the spindle axis).
As described above, when the horizontal position changes in accordance with the operation, a measure to prevent inclination by mechanical arrangement with respect to the center of gravity position, such as Patent Document 4 described above, can not be used.
Further, even when using the reverse moment applying means as in the above-mentioned Patent Document 3, the barycentric position changes with the operation, and the moment to be offset changes, so complicated control becomes necessary in the reverse moment applying means. And structural complexity is also inevitable.

On the other hand, in the machine tool having the head and the ram as described above, the arrangement of the guide mechanism is taken into consideration to prevent the inclination of the ram although it is not the same as the reverse moment applying means described above.
For example, the head side portion of the guide mechanism is disposed close to each end opening of the insertion hole of the head through which the ram is inserted, and the distance between the pair of guide mechanisms is maximized at both ends.
By such a pair of guide mechanisms, the ram is drawn out and the center of gravity is moved largely, so that the inclination of the ram can be effectively prevented even when the inclination moment with respect to the head due to the weight of the ram is maximized.

However, even with such a pair of guide mechanisms, the load applied to each side of the guide mechanism changes when the center of gravity of the ram is at the center of the insertion hole and near any opening of the insertion hole. And there is a problem that it is difficult to eliminate the inclination of the ram.
Such a problem is a common problem in a machine tool having a moving part that moves horizontally (including moving in the other direction including a substantially horizontal or horizontal component) relative to the support part.

  An object of the present invention is to provide a machine tool which is simple in structure and capable of preventing tilting of a moving part moving horizontally.

The machine tool of the present invention is a machine tool having a support portion, a moving portion supported by the support portion, and a movement mechanism for moving the movement portion horizontally with respect to the support portion, the movement mechanism comprising A load supporting guide mechanism and a position maintaining guide mechanism , wherein the load supporting guide mechanism is formed on the load supporting moving member installed on the moving portion and the load supporting moving mechanism. a load supporting guide surface for member sliding a Aburasei pressure guide the mechanism to have a, the load supporting movable member, the center position of the support load on the load supporting guide surface to the center of gravity of the moving part The posture holding guide mechanism, which is installed together, is formed in the moving portion and extends in the moving direction, and the posture is provided at two places which are installed in the supporting portion and are separated in the moving direction. For holding An attitude holding the moving member to the inner surface and the sliding, the sliding guide mechanism der Rukoto having characterized.

  In such an embodiment of the present invention, the movable portion is supported by the support portion and is moved in a predetermined movement direction by the movement mechanism. The moving part is transferred by its load to the supporting part by the load supporting guide mechanism and supported by the supporting part. In the load support guide mechanism, the load support moving member moves integrally with the moving portion, and slides against the load support guide surface formed on the support portion.

The load support moving member is installed with the center position of the support load with respect to the load support guide surface aligned with the center of gravity of the moving portion, so even if the moving portion moves relative to the support portion, the center of gravity of the moving portion It will support the position.
For this reason, even if the moving part moves to an arbitrary position with respect to the supporting part, the center of gravity is always supported, so that the moment does not change according to the position and tilt or tilting does not occur.
In the present invention, by using the hydrostatic pressure guide mechanism for the load support guide mechanism, high load capacity and low friction can be secured.
On the other hand, in the present invention, the moving part moving relative to the support part is guided by the posture maintaining guide mechanism and the posture thereof is accurately held.
In particular, in the posture holding guide mechanism, the movable part is inclined relative to the moving direction by sliding at two distant places of the support member, for example, two places near both side openings of the insertion hole through which the movable part is inserted. Can be regulated to further enhance the accuracy in the moving direction.
In the present invention, by using a slide guide mechanism for the posture maintaining guide mechanism, high guiding accuracy and damping performance required for posture maintaining can be obtained, and the structure can be simplified.
In the present invention, the load support of the moving part with respect to the supporting part is performed by the above-described load supporting guide mechanism, and as the slide guiding mechanism of the posture maintaining guide mechanism, the posture of the moving part may be exclusively maintained.
As described above, according to the present invention, the load supporting guide mechanism always supports the weight of the moving part at the center of gravity position to prevent the moving part from tilting and falling, and the posture maintaining guide mechanism holds the posture of the moving part. be able to.

In the present invention, the horizontal movement is not limited to the case where the movement axis is in the horizontal direction, but also includes the case where the movement axis is in the other direction having a horizontal component. For example, it includes movement in the other movement direction such that horizontal displacement occurs when the moving part moves, as well as horizontal direction or substantially horizontal direction.
Furthermore, the movement other than the vertical direction includes a component in the horizontal direction, and in the present invention, the movement of the horizontal component can be treated as horizontal movement. However, the present invention is effective when the movement of the center of gravity due to the horizontal component is remarkable, specifically, about 45 degrees with respect to the horizontal direction and the horizontal. However, the present invention is effective when movement in the direction inclined by 45 degrees or more with respect to the horizontal direction is largely affected by the movement of the center of gravity of the moving part.

  As the support portion and the moving portion in the present invention, various combinations for performing the above-described horizontal movement are applicable. For example, a ram (square cross section) or quill (circular cross section) can be used as a moving part with respect to a head that is a support part, and a spindle head that vertically moves and horizontally moves with respect to a column that is a support part It is possible to make the moving part the moving part in the state or in the state of projecting from the support part and moving horizontally.

  The load supporting guide surface may be a surface of a portion facing the moving portion, such as an inner surface of a portion that accommodates, holds or inserts the moving portion of the support portion, and a surface continuous in the moving direction can be used. The load supporting guide surface is not limited to one using the surface of the member of the support portion as it is, but may be formed by separately installing a guide member for sliding.

  In the machine tool according to the present invention, it is preferable that the load supporting moving member is installed at a position immediately below the center of gravity of the moving portion of the lower surface of the moving portion.

According to the present invention, load support by the load support moving member can be performed immediately below the center of gravity of the moving portion, and the center of gravity position of the moving portion can always be supported by the support portion.
The load supporting moving member is not limited to one independently disposed immediately below the position of the center of gravity. For example, a plurality of load supporting moving members are disposed on the lower surface of the moving portion or on the side surface of the moving member so as to surround the center of gravity. The resultant force of the support load by them may be configured to coincide with the center of gravity position.

However, if the load supporting moving member is independently disposed immediately below the center of gravity position, the structure is simpler and the relationship with the center of gravity position can be reliably set.
When the load supporting moving member is arranged alone, there is a limit to the area sliding against the load supporting guide surface, but if the hydrostatic pressure guide mechanism described later is used, a sufficiently high load capacity can be obtained even in a narrow area. It can be secured.

  In the machine tool of the present invention, an attachment can be attached to the moving portion, and the load supporting moving member is mounted immediately below the center of gravity of the moving portion in the non-attachment state and the attachment is attached. It is desirable that they are respectively installed immediately below the center of gravity of the moving part in the state.

In the present invention, the attachment is, for example, an angle head or the like attached to a spindle instead of a tool at the tip of a ram or quill which is a moving part of a machine tool.
In the present invention, as a specific configuration for respectively installing the load supporting moving member immediately below the center of gravity when the attachment is not attached and immediately below the center of gravity when the attachment is attached, a plurality of load supports It is possible to adopt the installation of the moving member at each barycentric position, the use of a long load supporting moving member straddling each barycentric position, and the like.

In such a present embodiment, even when the attachment is attached or not attached, the load supporting moving member can be disposed immediately below each barycentric position.
When using a plurality of load supporting moving members corresponding to the respective center of gravity positions, the load supporting moving members corresponding to the center of gravity position are made effective and the non-corresponding load supporting moving members are stopped according to the presence or absence of the attachment. , Etc. may be switched.
Furthermore, in the case of using another attachment in which the center of gravity is located between a plurality of load supporting moving members, the load balance of the two load supporting moving members is adjusted and the middle of the two load supporting moving members is adjusted. You may support the coming center of gravity.

  In the machine tool according to the present invention, the load supporting guide mechanism includes a static pressure chamber whose outer periphery is sealed, a supply path for supplying a lubricating oil to the static pressure chamber, and a recovery for recovering the lubricating oil from the static pressure chamber. It is desirable that the hydrostatic pressure guide mechanism has a path.

  In the present invention as described above, the hydrostatic pressure guide mechanism has a closed hydrostatic pressure structure in which the outer periphery of the hydrostatic pressure chamber is sealed. Such a hydrostatic pressure guide mechanism can ensure high load capacity and low friction in the load support guide mechanism.

  The load supporting guide mechanism can also be a hydrostatic pressure slide combination type that uses a hydrostatic pressure guide mechanism and a slide guide mechanism in combination. In such a hydrostatic pressure slide combination type guide mechanism, high load capacity and low friction can be secured by the hydrostatic pressure guide mechanism, and the guide accuracy and damping performance can be secured by the slide guide mechanism. As a result, it is possible to provide the anti-tilt mechanism having high load capacity, low friction, high guiding accuracy, and high damping performance.

The load supporting guide mechanism may be an hydrostatic pressure guide mechanism, and as described later, the attitude holding guide mechanism may be a slide guide mechanism.
In the moving mechanism, even when the hydrostatic pressure guiding mechanism and the sliding guide mechanism coexist, the lubricating oil overflowing from the hydrostatic pressure guiding mechanism can be reduced or eliminated by recovering the lubricating oil in the recovery path. This eliminates the possibility that the sliding guide mechanism or other parts of the machine tool have undesirable effects (such as mixing of different types of lubricating oil).

  In the present invention, in the hydrostatic pressure guide structure, load support between two members moving relative to each other is performed by the static pressure of the lubricating oil in the static pressure chamber. As the oil static pressure guide structure, any of an enclosed type oil static pressure structure and a flow type or circulation type oil static pressure structure can be used.

  In the enclosed hydrostatic pressure structure, only the supply path is connected to the static pressure chamber, and the recovery path is not connected. Lubricating oil is supplied from the supply path, and is filled into the static pressure chamber at a predetermined pressure. When the lubricating oil in the static pressure chamber decreases, the lubricating oil is replenished from the supply path.

In the flow type static oil pressure structure, the static pressure chamber is connected to the supply path and the recovery path. The lubricating oil is supplied from the supply path, generates static pressure while flowing in the static pressure chamber, and is recovered from the static pressure chamber to the recovery path.
In the flow type static oil pressure structure, by reusing the lubricating oil recovered from the recovery path in the supply path, a circulation type static oil pressure structure can be obtained.

In the present invention, the supply path and the recovery path can use a flow path formed in the moving portion, a pipe extending from the moving portion to the support portion, and the like.
A pump for driving the lubricating oil and a tank for storing the lubricating oil can be connected to the supply path and the recovery path, respectively, and an instrument or the like for detecting the state of the pressure or flow rate of the lubricating oil You may install it.
In addition, in the recovery path, not only the pipe sealed from the outside but also a path opened to the outside air, for example, a recovery path used for a conventional oil static pressure guide mechanism such as a weir can be used.

  In the machine tool according to the present invention, it is preferable that the supply path supplies lubricating oil to an outer peripheral side of the static pressure chamber, and the recovery path recovers the lubricating oil from a central portion of the static pressure chamber.

In the present invention as described above, the lubricating oil from the supply path is supplied to the outer peripheral side of the static pressure chamber, and the supplied lubricating oil circulates around the static pressure chamber and is connected to the central portion of the static pressure chamber. It is recovered from the recovery route.
By performing such a center recovery of the lubricating oil, the flow rate of the lubricating oil as the hydrostatic pressure guide mechanism can be reduced.

  That is, in the conventional hydrostatic pressure guide mechanism, a pressure holding portion (so-called land portion) is provided along the outer periphery of the static pressure chamber in order to generate a desired static pressure in the inner static pressure chamber (so-called recess). It is formed. Then, the lubricating oil in the static pressure chamber is discharged from the outer periphery through the pressure holding portion along the outer periphery. At this time, since the circumferential length of the pressure holding portion along the outer periphery is increased in proportion to the radius, a predetermined flow velocity (predetermined pressure in the inner static pressure chamber) is obtained when passing the pressure holding portion in the radial direction. In order to secure the flow velocity that can be maintained, the total flow rate must be a considerably large flow rate.

In order to supply such a large flow rate, a large capacity is required in the supply device, and an increase in the size of the device configuration, such as an increase in pipe diameter, can not be avoided.
On the other hand, in the present invention, in order to perform central recovery, the pressure holding portion may be formed around the opening for recovery, and the circumferential length thereof can be remarkably shortened. For this reason, the flow rate of the lubricating oil can be significantly reduced, and the lubricating oil supply device, supply path and recovery path can be miniaturized and simplified.

  In the machine tool according to the present invention, it is desirable that the load supporting movable member be formed with the static pressure chamber facing the load supporting guide surface and a seal portion surrounding the static pressure chamber.

In the present invention as described above, lubricating oil is supplied from the supply path into the static pressure chamber, and an oil film is formed between the inner surface of the static pressure chamber and the load supporting guide surface. The guide surface can be floated and supported.
At this time, the lubricating oil in the static pressure chamber is supplied from the supply path to the static pressure chamber, supports the load from the load supporting guide surface in the static pressure chamber, and moves inward from the outer peripheral side of the static pressure chamber. The whole amount is recovered from the central recovery path.
And, on the outer periphery of the static pressure chamber, the lubricating oil does not leak to the outside than the seal portion by the seal portion surrounding the static pressure chamber, thereby forming a closed type hydrostatic pressure guide mechanism. it can.
Furthermore, as described above, by performing the center recovery of the lubricating oil by the recovery path connected to the center of the static pressure chamber, it is possible to reduce the flow rate of the lubricating oil. The recovery path can be miniaturized and simplified.

In the present invention, as the static pressure chamber, a recess of a predetermined depth (about several tens of microns) formed concavely on the surface of the moving member can be used.
In the static pressure chamber, concentric pressure grooves are formed in the static pressure chamber to divide the static pressure chamber into an inner side and an outer side, the inner side is a pressure holding portion (land), and the outer side is a static pressure chamber main body Can be Even if the inner pressure holding portion and the outer static pressure chamber main body have the same depth, the pressure holding portion on the inner side can produce a pressure holding effect in the static pressure chamber main body by forming an isopressure groove deeper than these. it can. Thereby, in the static pressure chamber main body, it is possible to carry a load due to the static pressure of the lubricating oil, and it is possible to obtain a function as an oil static pressure guide structure.

In the present invention, the hydrostatic pressure guide structure is formed by forming a shallow pressure holding portion (a land portion taller than the outer static pressure chamber main body) having a depth surrounding the recovery path on the inner periphery of the static pressure chamber. You may get the function as
The planar shape of the static pressure chamber may be, for example, a circle, an ellipse, or an oval, and may be a rectangle such as a square or a rectangle, or another polygon. Also in the case of rectangles or polygons, it is desirable that each vertex be in the shape of a circular arc or the like, and that the rounded part be rounded.

As the seal portion, a combination of a seal groove deeper than the depth of the static pressure chamber formed along the periphery of the static pressure chamber and an annular seal member installed in the seal groove can be used.
As the sealing member, a sealing member is preferably secured by being in close contact with the bottom surface of the static pressure chamber and the guide surface facing each other, and a molded article made of an elastomeric material having a height greater than the depth of the static pressure chamber can be used. . For example, although oil-resistant O-rings and the like can be used, it is also effective to appropriately add lip seals etc. so as to be able to cope with the high pressure in the static pressure chamber and to prevent the leakage of lubricating oil.
The planar shape of the seal portion may be a shape along the contour of the static pressure chamber, and may be a circle, a rectangle or another shape according to the static pressure chamber.

In the present invention, the recovery path may be in communication with the central portion of the static pressure chamber, and may not be the geometric center as long as it is near the central portion of the static pressure chamber.
The supply path may be in communication with the outer peripheral side of the recovery path of the static pressure chamber, and may be in the vicinity of the outer periphery of the static pressure chamber or inside the seal groove of the seal portion. At this time, the supply path may be in communication with an arbitrary position of the seal groove, but may be in communication with a plurality of places of the seal portion so as to prevent unevenness in the circumferential direction.

  According to the present invention, it is possible to provide a machine tool having a simple structure and capable of preventing inclination of a moving part moving horizontally.

BRIEF DESCRIPTION OF THE DRAWINGS The perspective view which shows the machine tool of 1st Embodiment of this invention. FIG. 5 is a perspective view showing a moving mechanism of the first embodiment. The disassembled perspective view which shows the moving mechanism of the said 1st Embodiment. The perspective view which shows the principal part of the guide mechanism for attitude | position holding | maintenance of the said 1st Embodiment. Sectional drawing which shows the principal part of the guide mechanism for attitude | position holding | maintenance of the said 1st Embodiment. The perspective view which shows the principal part of the guide mechanism for load supports of the said 1st Embodiment. Sectional drawing which shows the principal part of the guide mechanism for load supports of the said 1st Embodiment. The model side view which shows operation | movement of the mechanism for load support of the said 1st Embodiment. Sectional drawing which shows the principal part of the guide mechanism for load supports of 2nd Embodiment of this invention. The model top view which shows the guide mechanism for load supports of 3rd Embodiment of this invention. The model side view which shows the guide mechanism for load supports of 4th Embodiment of this invention. The model side view which shows the guide mechanism for load supports of 5th Embodiment of this invention.

First Embodiment
1 to 8 show a first embodiment according to the present invention.
In FIG. 1, a machine tool 10 has a table 12 and a column 13 on the upper surface of a base 11.
The table 12 is formed in a disk shape, and is rotatably supported around a vertical axis (B axis). Between the base 11 and the table 12, a B-axis moving mechanism 21 is installed to rotate the table 12 with respect to the base 11.

The column 13 is formed in a prismatic shape, and the head 14 is supported on the side so as to be able to move up and down.
A Y-axis moving mechanism 22 is provided between the column 13 and the head 14 in order to move the head 14 up and down, that is, in the vertical direction (Y-axis direction) along the column 13.
A part of the column 13 and the head 14 in which the Y-axis moving mechanism 22 is formed is covered by a cover 19.

An insertion hole 15 is formed in the head 14. A prismatic ram 16 extending in the horizontal direction is inserted into the insertion hole 15. A main shaft 17 is rotatably supported by the ram 16 and a tool 18 is mounted at its tip.
Although a ram 16 (square cross section) is used in the present embodiment, a quill (circular cross section) or the like may be used.

A Z-axis moving mechanism 23 is provided between the head 14 and the ram 16 in order to move the ram 16 horizontally with respect to the head 14, that is, in the horizontal direction (Z-axis direction).
In the present embodiment, the head 14 is a support portion of the present invention, the ram 16 is a moving portion of the present invention, and the Z-axis moving mechanism 23 is a moving mechanism for moving the moving portion horizontally with respect to the support portion.

[Z-axis moving mechanism]
In FIG. 2, the Z-axis moving mechanism 23 has four inner side surfaces (upper inner side surface 15A, lower inner side surface 15B, left and right inner side surfaces 15C, 15D) of the insertion hole 15, and outer side surfaces of the ram 16 facing each other. A posture maintaining guide mechanism 30 (first to fourth posture maintaining means for maintaining the posture of the ram 16 with respect to the head 14 between the upper outer side surface 16A, the lower outer side surface 16B, and the left and right outer side surfaces 16C, 16D) Guide mechanisms 30A to 30D). Furthermore, the Z-axis moving mechanism 23 is a load-supporting guide mechanism that causes the head 14 to support the load of the ram 16 between the lower inner side surface 15B of the insertion hole 15 and the lower outer side surface 16B of the opposing ram 16. It has 37.

[Guide mechanism for maintaining posture]
In FIGS. 2 and 3, the posture maintaining guide mechanism 30 has first to fourth postures along the inner side (upper inner side 15A, lower inner side 15B, left and right inner sides 15C, 15D) of the insertion hole 15. The holding guide mechanisms 30A to 30D are provided with posture holding moving members 31 (first to fourth posture holding moving members 31A to 31D).
The posture maintaining moving members 31 are formed of plate members extending in the Z-axis direction, and two pairs of the posture maintaining moving members 31 are provided along the both sides of the inner side surface of the insertion hole 15.

The surface of the posture maintaining moving member 31 is opposed to the outer surface (upper outer surface 16A, lower outer surface 16B, left and right outer surfaces 16C, 16D) of the ram 16, respectively, and these outer surfaces are used as the posture maintaining guide surface The posture maintaining guide mechanism 30 is configured between each other.
In the present embodiment, a slide guide mechanism 50 (see FIGS. 6 and 7), which will be described later, is employed as the posture holding guide mechanism 30.

[Guide for Load Support]
In FIGS. 2 and 3, the load support guide mechanism 37 includes a load support moving member 38 that moves along the lower inner side surface 15 </ b> B of the insertion hole 15.

The load supporting moving member 38 is formed of a short plate material, and is installed between the pair of posture maintaining moving members 31B installed on the lower outer side surface 16B of the ram 16.
The load supporting moving member 38 is disposed immediately below the barycentric position G of the ram 16 so that the horizontal position overlaps with the barycentric position G.

The surfaces of the load supporting moving members 38 are opposed to the lower inner side surface 15B of the insertion hole 15, respectively. The lower inner side surface 15B is used as a posture holding guide surface, and the load supporting guide mechanism 37 is configured between each other. There is.
In the present embodiment, a hydrostatic pressure guide mechanism 40 (see FIGS. 4 and 5), which will be described later, is employed as the load support guide mechanism 37.

Note that the weight of the ram 16 is solely borne by the load supporting moving member 38 and the load supporting guide mechanism 37. Therefore, even when the hydrostatic pressure guide mechanism 40 described later is used as the load support guide mechanism 37, an auxiliary guide mechanism is provided between the upper outer surface 16A of the ram 16 and the upper inner surface 15A of the insertion hole 15. There is no need to provide it.
However, the same configuration as the load supporting moving member 38 and the load supporting guiding mechanism 37 described above is applied to the upper outer surface 16 A of the ram 16 and the upper inner surface 15 A of the insertion hole 15 for the purpose of applying preload. It may be installed between

[Slide guide mechanism]
In FIG. 4 and FIG. 5, two sets of the slide guide mechanism 50 are formed separately at both ends of the posture maintaining moving member 31.
The slide guide mechanism 50 has sliding surfaces 51 and outer peripheral surfaces (upper outer surface 16A, lower outer surface 16B, left and right outer surfaces) of the ram 16 which is a guide surface for posture holding, at both ends of the moving member 31 for posture holding. The posture of the ram 16 and the head 14 in the Z-axis direction can be accurately maintained by bringing them into contact with 16C and 16D).

The sliding guide mechanism 50 has a smooth sliding surface 51 that slides on the guiding surface. On the sliding surface 51, a sheet formed of a low friction material such as tetrafluoroethylene is attached over the entire surface.
Further, an oil supply groove 52 continuous in the vertical and horizontal directions is formed on the sliding surface 51, and the oil supply path 53 is in communication with the oil supply groove 52. Therefore, when the lubricating oil is supplied to the oil feeding path 53, the supplied lubricating oil is diffused to the entire sliding surface 51 by the oil feeding groove 52.
With such a sliding surface 51, it is possible to reduce sliding resistance and wear while securing high guiding accuracy with the outer circumferential surface of the ram 16 which is the posture maintaining guide surface.

The sliding guide mechanism 50 is connected to a lubricating oil supply device 60 for supplying lubricating oil to the oil supply path 53.
The lubricating oil supply device 60 has a tank 69 for storing lubricating oil, and a supply pipe 66 for supplying the lubricating oil in the tank 69 to the sliding guide mechanism 50. In the middle of the supply pipe 66, a filter 68 for filtering the passing lubricating oil, and a pump 67 for intermittently pumping the lubricating oil at an appropriate amount are installed.

  A recovery weir is provided below the side of the posture maintaining moving member 31 as a discharge path of the lubricating oil supplied to the sliding guide mechanism 50, and the lubricating oil received by this recovery weir is returned to the waste oil tank and stored. It is also good. You may use piping suitably as a discharge path.

[Oil static pressure guide mechanism]
In FIGS. 6 and 7, the hydrostatic pressure guide mechanism 40 is formed side by side on the load supporting moving member 38.
The hydrostatic pressure guide mechanism 40 has a smooth surface 49 that slides on the guide surface. On the smooth surface 49, a sheet formed of a low friction material such as tetrafluoroethylene is attached over the entire surface.
Furthermore, the smooth surface 49 is formed with a circular static pressure chamber 41 formed in a concave shape, and a seal portion 42 that continuously surrounds the periphery in an annular shape.

  In the assembled state, the static pressure chamber 41 is a closed space covered by upper and lower inner side surfaces (upper inner side surface 15A, lower lower side surface 15B) of the insertion hole 15 which is a guide surface. And, by carrying out load support of the guide surface with the lubricating oil supplied into the static pressure chamber 41, an oil static pressure structure is formed, and a high load capacity and sufficient low friction performance with respect to the guide surface can be obtained.

In order to supply and recover the lubricating oil to the static pressure chamber 41, a supply path 43 and a recovery path 44 are formed.
At the bottom of the static pressure chamber 41, a communication hole 441 of the recovery path 44 is communicated with the center thereof, and an annular groove 411 is formed concentric with the opening.
The bottom surface of the static pressure chamber 41 is divided into an inner portion 412 and an outer portion 413 with the annular groove 411 as a boundary. A communication groove 414 in the radial direction from the annular groove 411 to the seal portion 42 is formed in a part of the outer portion 413.

An annular seal groove 421 is formed in the seal portion 42 along the outer periphery of the static pressure chamber 41. In the seal groove 421, a seal member 422 made of an elastomer molded product such as oil resistant rubber is disposed.
A communication hole 431 of the supply path 43 is in communication with a part of the seal groove 421 on the inner side (the static pressure chamber 41 side) than the seal member 422.

The supply and recovery of the lubricating oil to the static pressure chamber 41 is performed by the lubricating oil supply device 60.
The lubricating oil supply device 60 has a tank 61 for storing lubricating oil, a supply pipe 63 extending from the tank 61 to the supply path 43, and a recovery pipe 64 returning from the recovery path 44 to the tank 61.
In the middle of the supply pipe 63, a filter 65 for filtering the passing lubricating oil and a pump 62 for pressurizing the lubricating oil are installed.

The lubricating oil supply device 60 takes out the lubricating oil stored in the tank 61 from the supply pipe 63, filters it with the filter 65, pumps it with the pump 62, and supplies it to the supply path 43. As a result, pressurized lubricating oil is supplied from the seal portion 42 of the outer periphery into the static pressure chamber 41 from the supply path 43.
On the other hand, the lubricating oil in the static pressure chamber 41 is recovered from its center into the recovery path 44, and the entire amount is returned to the tank 61 through the recovery pipe 64.

In such an oil static pressure guide mechanism 40, pressurized lubricating oil is supplied from the supply path 43, flows from the seal groove 421 into the static pressure chamber 41, and the inside of the static pressure chamber 41 from the outer portion 413 to the inner portion It moves to 412 and is recovered from the communication hole 441 to the recovery path 44.
At this time, the lubricating oil in the static pressure chamber 41 floats and supports the upper and lower inner side surfaces (upper inner side surface 15A, lower inner side surface 15B) of the insertion hole 15 which is the guide surface by the static pressure. The function as the guide mechanism 40 is obtained.
On the other hand, the lubricating oil in the static pressure chamber 41 is entirely recovered from the recovery path 44. Furthermore, since the periphery of the static pressure chamber 41 is sealed by the seal portion 42, the lubricating oil is prevented from leaking to the outside.

In the present embodiment, the thickness of the static pressure chamber 41 (the distance between the inner portion 412 and the upper inner surface 15A and the lower inner surface 15B as guide surfaces), that is, the depth of the recess with respect to the smooth surface 49 It is formed extremely shallow (about several tens of microns) compared to the groove 411.
Furthermore, the inner portion 412 and the outer portion 413 are set at the same height. That is, the depth (with respect to the smooth surface 49) of the static pressure chamber 41 in the inner portion 412 is the same as the depth in the outer portion 413.

Therefore, in the assembled state, the thickness of the outer portion 413 of the static pressure chamber 41 (the distance between the outer portion 413 and the upper inner surface 15A and the lower inner surface 15B) and the thickness of the inner portion 412 of the static pressure chamber 41 (inner portion) The distance between the portion 412 and the upper inner surface 15A and the lower inner surface 15B is the same.
However, an annular groove 411 is formed between the inner portion 412 and the outer portion 413, and the annular groove 411 is in communication with the seal groove 421 by the communication groove 414. Therefore, in the outer portion 413, the pressure is maintained at the same pressure as the pressure of the lubricating oil from the supply path 43 supplied through the communication hole 431.

With such a setting, when the lubricating oil flows from the outer portion 413 of the static pressure chamber 41 to the inner portion 412, the inner portion 412 acts as a land portion or a pressure holding portion.
That is, on the outer side of the inner portion 412 (area facing the annular groove 411), although the pressure is the same as that of the outer portion 413, the pressure gradually decreases as it flows inward, and it is large when reaching the communication hole 441 of the recovery path 44. It will be about atmospheric pressure.

Thus, the inner portion 412 acts as a land portion or a pressure holding portion, whereby static pressure for load support can be secured in the outer portion 413 which is the recess portion or the static pressure chamber main body.
Further, the static pressure support by the lubricating oil in the static pressure chamber 41 is performed on the outer side 413 which is mainly on the outer peripheral side and the area of the static pressure chamber 41 is large, and the pressure receiving area can be expanded. Efficient hydrostatic support can be provided by the incoming high pressure lubricating oil.

Operation of First Embodiment
In the present embodiment, even when the ram 16 moves horizontally with respect to the head 14, the load supporting guide mechanism 37 always receives the weight of the ram 16 at its center of gravity G. The attitude of the ram 16 with respect to the head 14 is accurately maintained by the attitude holding guide mechanism 30. Therefore, even if the ram 16 moves horizontally, the ram 16 is prevented from tilting or falling relative to the head 14.

In FIG. 8A, when the ram 16 moves horizontally in the tip direction (right side in the figure), the tip end side of the ram 16 largely protrudes from the head 14 and the barycentric position G of the ram 16 corresponds to the head 14 and the insertion hole 15 Move to near the right end.
As shown in FIG. 8B, when the ram 16 horizontally moves in the opposite direction (left side in the drawing), the opposite side of the ram 16 largely protrudes from the head 14, and the center of gravity G of the ram 16 is the head 14 and the insertion hole. Move to the vicinity of the left edge of 15.

  In these states, if the ram 16 is supported only by the attitude holding guide mechanism 30, the weight of the ram 16 is exclusively carried by the right end portion or the left side portion of the attitude holding guide mechanism 30, and the load on each side is The tip side of the ram 16 may be inclined downward by the increase of.

However, in the present embodiment, the load supporting guide mechanism 37 is installed at the gravity center position G of the ram 16, and the weight of the ram 16 is always received by the load supporting guide mechanism 37. Load fluctuation accompanying horizontal movement of the ram 16 is slightly suppressed.
Therefore, even if the ram 16 moves horizontally with respect to the head 14, the ram 16 is prevented from tilting or falling with respect to the head 14.

[Effect of First Embodiment]
According to the present embodiment, the ram 16 which is the moving part is supported by the head 14 which is the supporting part, and can be moved in the predetermined moving direction by the Z-axis moving mechanism 23.
That is, the ram 16 is supported by the load supporting guide mechanism 37 by transmitting its own weight to the head 14. In the load support guide mechanism 37, the load support moving member 38 moves integrally with the ram 16 and slides on the load support guide surfaces (upper inner side surface 15A and lower inner side surface 15B) of the head 14.

The load support moving member 38 is installed in such a manner that the center position of the support load with respect to the load support guide surface matches the center of gravity position G of the ram 16. For this reason, in the load support guide mechanism 37, even if the ram 16 moves with respect to the head 14, it always supports the gravity center position G of the moving part.
Thus, the ram 16 is always supported at the center-of-gravity position G even if it moves to any position relative to the head 14. Therefore, the moment changes according to the horizontal position of the ram 16 and the ram 16 does not tilt or fall with respect to the head 14.
Therefore, according to the present embodiment, it is possible to provide the machine tool 10 having a simple structure and capable of preventing the inclination of the moving part moving horizontally.

In the present embodiment, since the load supporting moving member 38 is independently disposed immediately below the center of gravity position, the structure is simpler, and the relationship with the center of gravity position G can be reliably set.
At this time, there is a limit to the area sliding on the lower inner side surface 15B which is a load supporting guide surface, and a sufficiently large area may not be secured. However, the hydrostatic pressure guide mechanism as the load support guide mechanism 37 Since 40 is used, a sufficiently high load capacity can be secured even in a narrow area.

In the present embodiment, as described above, the load supporting guide mechanism 37 always supports the weight of the ram 16 at the gravity center position G, and can prevent the ram 16 from tilting and falling. , The attitude of the ram 16 can be held.
In particular, in the posture holding guide mechanism 30, the inclination with respect to the moving direction of the ram 16 is restricted by sliding and supporting in the vicinity of the two openings which are two places apart in the insertion hole 15 of the head 14, Accuracy can be further enhanced.

In the present embodiment, by using the hydrostatic pressure guide mechanism 40 as the load support guide mechanism 37, high load capacity and low friction can be ensured in the load support guide mechanism 37.
Furthermore, since the load supporting guide mechanism 37 is the hydrostatic pressure guide mechanism 40 and the slide guide mechanism 50 is used as the attitude holding guide mechanism 30, high guiding accuracy and damping characteristics can be secured, By using the characteristic complementarily, the guiding performance of the ram 16 can be enhanced.

  As described above, in the present embodiment, the load support of the ram 16 with respect to the head 14 is performed by the load supporting guide mechanism 37, and the attitude maintaining guide mechanism 30 may perform the attitude maintaining of the ram 16 exclusively. . Therefore, by using the slide guide mechanism 50 for the posture maintaining guide mechanism 30, high guiding accuracy and damping performance necessary for maintaining the posture can be obtained, and the structure can be simplified.

  In the present embodiment, the hydrostatic pressure guide mechanism 40 used for the load supporting guide mechanism 37 has a closed hydrostatic pressure structure in which the outer periphery of the static pressure chamber 41 is sealed. Was collected in total. For this reason, the lubricating oil overflowing from the hydrostatic pressure guide mechanism 40 can be reduced or eliminated, and the slide guide mechanism 50 or other parts of the machine tool 10 have undesirable effects (such as mixing different types of lubricating oil) Can eliminate the possibility of

Second Embodiment
A second embodiment according to the present invention is shown in FIG.
In the present embodiment, the basic configurations of the machine tool 10, the attitude holding guide mechanism 30, the load support guide mechanism 37, the hydrostatic pressure guide mechanism 40, and the slide guide mechanism 50 are common, and redundant descriptions will be omitted. The different configurations are described below.

  In the first embodiment described above, the static pressure chamber 41 of the hydrostatic pressure guide mechanism 40 has the annular groove 411, the inner portion 412, the outer portion 413, and the communication groove 414. The annular groove 411 and the communication groove 414 communicate with the seal groove 421 while the inner portion 412 and the outer portion 413 have the same depth, so that the inner portion 412 functions as a pressure holding portion (land portion), The outer portion 413 functions as a static pressure chamber main body (recess portion).

In the present embodiment, the annular groove 411 and the communication groove 414 are omitted, and the inner portion 412 is actually made a land (pressure holding portion) by forming the depth of the outer portion 413 deeper than the inner portion 412, and The outer portion 413 is a recess (static pressure chamber main body).
In the present embodiment, the depth of the inner portion 412 is about several tens of microns as in the first embodiment described above, and the depth of the outer portion 413 is deeper than the inner portion 412.

  According to the present embodiment, the basic configurations of the machine tool 10, the posture maintaining guide mechanism 30, the load supporting guide mechanism 37, the hydrostatic pressure guide mechanism 40, and the slide guide mechanism 50 are the same as the first embodiment described above. As they are common, the effects of these can be obtained as well.

  Furthermore, although the annular groove 411 and the communication groove 414 are omitted in the present embodiment, static pressure load support is performed in the same manner as the first embodiment described above by setting the depths of the inner portion 412 and the outer portion 413. Thus, the function as the hydrostatic pressure guide mechanism 40 can be obtained.

Third Embodiment
A third embodiment of the present invention is shown in FIG.
In the present embodiment, the basic configurations of the machine tool 10, the attitude holding guide mechanism 30, the load support guide mechanism 37, the hydrostatic pressure guide mechanism 40, and the slide guide mechanism 50 are common, and redundant descriptions will be omitted. The different configurations are described below.

  In the first embodiment described above, the posture maintaining guide mechanism 30 is provided on each inner side (upper inner side 15A, lower inner side 15B, left inner side 15C, right inner side 15D) of the insertion hole 15 of the head 14. The pair of posture maintaining moving members 31 (first to fourth posture maintaining moving members 31A to 31D) are provided.

  Then, load supporting moving members 38 are installed on the lower outer side surface 16B of the ram 16 and arranged so as to be fitted between a pair of attitude maintaining moving members 31 installed on the upper and lower inner side surfaces 15A and 15B. (See Figure 2 and Figure 3).

Thus, in the first embodiment, the load support moving member 38 is disposed immediately below the gravity center position G of the ram 16, and the load support guiding mechanism 37 supports the weight of the ram 16 at the gravity center position G of the ram 16. It was supposed to be.
On the other hand, in the present embodiment, the plurality of load supporting moving members 38 are disposed at a position not immediately below the gravity center position G, and the combined force of the respective support loads is configured to match the gravity center position G.

In FIG. 10, the head 14, the insertion hole 15 and the ram 16, the upper and lower left and right inner side surfaces 15A to 15D, and the upper and lower left and right outer sides 16A to 16D are the same as those in the first embodiment described above.
In the present embodiment, one posture is taken as the posture maintaining guide mechanisms 30 (first and second posture maintaining guide mechanisms 30A, 30B) installed on the upper and lower inner side surfaces 15A, 15B of the insertion hole 15. A holding moving member 31 (first and second attitude holding moving members 31A, 31B) is installed.

A pair of load supporting moving members 38 are installed on both sides of the posture maintaining moving member 31 on the lower outer side surface 16B of the ram 16, and a load supporting guiding mechanism 37 is formed by the pair.
The pair of load support guiding mechanisms 37 are arranged symmetrically with respect to the center of gravity G of the ram 16. Therefore, the resultant force of the loads carried by the two load support guide mechanisms 37 can be made to coincide with the center of gravity position G.

In this embodiment, the combined force of the support load can be made to coincide with the gravity center position G while using the pair of load support guiding mechanisms 37 and installing the portion not directly under the gravity center position G of the ram 16. As in the first embodiment described above, tilting or falling can be prevented even if the ram 16 moves horizontally.
Furthermore, since two load supporting moving members 38 receiving the own weight are provided below the ram 16 and the load supporting moving member 38 used in the first embodiment is used, the area to bear the load is doubled. Can be

Fourth Embodiment
A fourth embodiment based on the present invention is shown in FIG.
In the present embodiment, the basic configurations of the machine tool 10, the attitude holding guide mechanism 30, the load support guide mechanism 37, the hydrostatic pressure guide mechanism 40, and the slide guide mechanism 50 are common, and redundant descriptions will be omitted. The different configurations are described below.

In the head 14, an expansion member 151 is installed adjacent to the opening of the insertion hole 15.
The extension member 151 is formed such that the upper surface 151 B is continuous with the lower inner side surface 15 B of the insertion hole 15, and is formed to have sufficient strength to receive the weight of the ram 16.

In this embodiment, for example, the ram 16 is further moved from the state shown in FIG. 8A, that is, from the state where the center of gravity G of the ram 16 and the load supporting moving member 38 reach near the right end in the drawing of the insertion hole 15. Can pay out.
That is, the load supporting moving member 38 comes out of the insertion hole 15 in a state in which the ram 16 is further drawn out, but by loading it on the upper surface 151B continuous with the lower inner side surface 15B, the load by the expanding member 151 Support is continued.

Therefore, even when the center of gravity position G protrudes from the insertion hole 15, the load support at the center of gravity position G can be maintained, and the inclination and the fall due to the horizontal movement of the ram 16 can be prevented.
Therefore, according to this embodiment, the same effect as that of the first embodiment described above can be obtained, and the horizontal movement range of the ram 16 can be expanded.

  As described above, the same configuration as the load supporting moving member 38 and the load supporting guiding mechanism 37 on the lower side of the ram 16 may be installed on the upper side of the ram 16. For example, when the load supporting moving member 38S and the load supporting guiding mechanism 37S shown by the chain line in FIG. 11 are provided, the extension member 151S is installed on the head 14 to form a surface continuous with the upper inner side surface 15A of the insertion hole 15. It is desirable that the function of the hydrostatic pressure guide mechanism 40 be maintained with the load supporting moving member 38S.

Fifth Embodiment
A fifth embodiment of the present invention is shown in FIG.
In the present embodiment, the basic configurations of the machine tool 10, the attitude holding guide mechanism 30, the load support guide mechanism 37, the hydrostatic pressure guide mechanism 40, and the slide guide mechanism 50 are common, and redundant descriptions will be omitted. The different configurations are described below.

  In the first embodiment described above, the tool 18 is attached to the tip of the ram 16 (see FIG. 1). The load supporting moving member 38 is disposed immediately below the gravity center position G of the ram 16, and the load supporting guide mechanism 37 is configured to support the weight of the ram 16 at the gravity center position G of the ram 16 (FIG. 2). reference).

In the present embodiment, an attachment 181 can be attached to the tip of the ram 16 instead of the tool 18. That is, the attachment 181 may be attached to the tip of the ram 16 according to the processing content, and the tool 18 may be attached to the tip to perform processing.
When such an attachment 181 is attached, the center of gravity of the ram 16 which is a moving part is G1. On the other hand, when the attachment 181 is removed (the tool 18 is directly attached to the ram 16), the center of gravity of the ram 16 which is the moving part is G0 (the same as the center of gravity G of the first embodiment shown in FIG. 8) It is.

In this embodiment, in order to correspond to such two barycentric positions G1 and G0, the load supporting moving member 38 and the auxiliary load supporting moving member 381 are disposed immediately below each other.
That is, the load supporting moving member 38 is installed immediately below the barycentric position G0 in a state where the attachment 181 is not attached. The load supporting moving member 38 is the same as that of the first embodiment described above.
On the other hand, the auxiliary load supporting moving member 381 is installed immediately below the barycentric position G1 in the state where the attachment 181 is attached.

In this embodiment, since the control device of the machine tool 10 can identify the presence or absence of the attachment 181, the load support moving member 38 and the auxiliary load support moving member 381 can be selected according to the presence or absence of the attachment 181. , Can be switched.
And, by such switching, even if the gravity center positions G0 and G1 change according to the presence or absence of the attachment 181, load support can be performed immediately below and immediately above.

Other Embodiments
In addition, this invention is not limited to the structure of embodiment mentioned above, The deformation | transformation in the range which can achieve the objective of this invention, etc. are included in this invention.

  The sliding guide mechanism 50 is not limited to one using the same lubricating oil as the hydrostatic pressure guiding mechanism 40 for lubrication and wear prevention, but uses other fats and oils, or uses a solid lubricating material for the sliding surface 51 It may be Even in such a case, since the leakage of the lubricating oil from the hydrostatic pressure guide mechanism 40 can be prevented by the seal portion 42, no problem occurs in the slide guide mechanism 50 due to the leaked lubricating oil.

In the hydrostatic pressure guide mechanism 40 according to the embodiment described above, the lubricating oil is supplied from the supply path 43 to the static pressure chamber 41, and the lubricating oil discharged from the static pressure chamber 41 is recovered from the recovery path 44. A circulating oil static pressure structure was adopted.
However, the present invention is not limited to the circulation type, but may be a simple flow type oil static pressure structure. For example, the lubricant oil is not returned to the tank 61 but is supplied from the supply channel 43 to the static pressure chamber 41 and the static pressure is generated in the static pressure chamber 41 and then recovered in the recovery channel 44. You may just do it.

  Furthermore, the oil static pressure guide mechanism 40 may have a sealed oil static pressure structure that utilizes the static pressure of the lubricating oil stored in the static pressure chamber 41. Even in this case, in order to maintain the amount and pressure of the lubricating oil in the static pressure chamber 41 at predetermined values, the supply path 43 needs to be installed, but the recovery path 44 can be omitted.

  INDUSTRIAL APPLICABILITY The present invention can be used as a machine tool, in particular, a machine tool having a horizontally moving moving part.

  DESCRIPTION OF SYMBOLS 10 ... Machine tool, 11 ... Base, 12 ... Table, 13 ... Column, 14 ... Head, 15 ... Insertion hole, 151, 151S ... Expansion member, 151B ... Upper surface, 15A ... Upper inner side, 15B ... Lower inner side ( Guide surface for load support), 15C: left inner surface, 15D: right inner surface, 16: ram, 16A: upper outer surface (first attitude holding guide surface), 16B lower outer surface (second attitude holding Guide surface), 16C ... Left outer surface (third attitude holding guide surface), 16D ... Right outer surface (fourth attitude holding guide surface), 17 ... Main axis, 18 ... Tool, 181 ... Attachment, 19 ... cover, 21 ... B axis moving mechanism, 22 ... Y axis moving mechanism, 23 ... Z axis moving mechanism, 30 ... attitude holding guiding mechanism, 30A ... first attitude holding guiding mechanism, 30B ... second attitude holding Guide mechanism, 30C ... third attitude maintaining guide mechanism, 30D Fourth attitude holding guide mechanism, 31 ... attitude holding moving member, 31 A: first attitude holding moving member, 31 B: second attitude holding moving member, 31 C: third attitude holding moving member, 31D: fourth attitude maintaining moving member, 37, 37S: load supporting guide mechanism, 38, 38S: load supporting moving member, 381: auxiliary load supporting moving member, 40: oil static pressure guide mechanism, 41: ... Static pressure chamber 411 annular ring 412 inner portion 413 outer portion 414 communication groove 42 seal portion 421 seal groove 422 seal member 43 supply path 431 communication hole 44 ... recovery path, 441 ... communication hole, 49 ... smooth surface, 50 ... guiding mechanism, 51 ... sliding surface, 52 ... oil feeding groove, 53 ... oil feeding path, 55 ... recovery weir, 56 ... waste oil tank, 60 ... lubricating oil supply Device, 61: Tank, 62: Pump 63 ... supply piping, 64 ... recovery pipe, 65 ... Filter, 66 ... supply piping, 67 ... pumps, 68 ... Filter, 69 ... tanks, G ... center-of-gravity position.

Claims (6)

A machine tool comprising: a support portion; a movable portion supported by the support portion; and a movement mechanism for horizontally moving the movable portion with respect to the support portion,
The moving mechanism has a load support guide mechanism and a posture holding guide mechanism .
The load supporting guiding mechanism, oils chromatic and load supporting movable member which is installed in the moving portion, and the load supporting guide surface on which the formed in the support portion to the moving member and the sliding said load supporting, the Static pressure guide mechanism,
The load support moving member is installed with the center position of the support load with respect to the load support guide surface aligned with the center of gravity of the moving portion .
The attitude maintaining guide mechanism is an attitude maintaining guide surface which is formed in the moving portion and extends in the moving direction, and the attitude maintaining guide surface is provided at the supporting portion and separated in two directions. machine tools for the orientation holding movable member slides, the sliding guide mechanism der Rukoto having said. In the machine tool according to claim 1,
The machine tool according to claim 1, wherein the load supporting moving member is installed at a position immediately below the center of gravity of the moving portion on the lower surface of the moving portion. In the machine tool according to claim 2,
An attachment can be attached to the moving part,
The load supporting moving member is installed immediately below the center of gravity of the moving portion in the non-mounted state and immediately below the center of gravity of the moving portion in the state in which the attachment is mounted. Machine tool with features. The machine tool according to any one of claims 1 to 3
The load supporting guide mechanism includes a static pressure chamber whose outer periphery is sealed, a supply path for supplying lubricating oil to the static pressure chamber, and a recovery path for recovering the lubricating oil from the static pressure chamber. A machine tool characterized in that it is a pressure guide mechanism. In the machine tool according to claim 4 ,
The supply path supplies lubricating oil to the outer peripheral side of the static pressure chamber;
The machine tool according to claim 1, wherein the recovery path recovers the lubricating oil from a central portion of the static pressure chamber. In the machine tool according to claim 4 or 5 ,
A machine tool characterized in that the static pressure chamber facing the load supporting guide surface and a seal portion surrounding the static pressure chamber are formed in the load supporting moving member.

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