JPH10118866A - Main spindle supporting boxy structural body for machine tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure the whole rigidity as much as necessary by forming each of left/right vertical surfaces which are opposed to each other across a main spindle in the direction for approximately crossing at right angles with the vertical sides opposed to each other in the front/rear direction, of cylindrical members having appropriate bending rigidity. SOLUTION: Vertical points formed into respective lateral ends of left/right vertical sides 1c, 1d are formed of lateral cylindrical members 14a extending to the whole height of the vertical sides 1c, 1D. The front/rear/left/right directions of the top/bottom ends between these cylindrical members are connected by lateral cylindrical members 14b, 14c formed into appropriate sectional dimensions. The four lateral cylindrical members 14a effectively contribute to the increase in the rigidity of the whole box structural body because of its predominancy in its installation position. A typical dimension of the section of the vertical cylindrical members 14a is set to approximately 1/7-7/4 of the front/rear or the left/right directional length of the boxy structural body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a box-shaped structure for supporting a spindle of a machine tool.

[0002]

2. Description of the Related Art Some machine tools are provided with a box-shaped structure in which a main shaft is supported so as to be vertically movable. When the machine tool is relatively large, the structure of the box-shaped structure is, for example, shown in FIG. 7A.
And B. Here, FIG. A is a plan sectional view showing a state in which a main shaft is mounted on a box-shaped structure, and FIG.

As shown in these figures, a box-shaped structure 1
Is generally formed by assembling plate members,
That is, the flat plates 2 are arranged on the front, rear, left and right vertical side surfaces 1a, 1b, 1c, and 1d and are connected to each other, and the vertical ribs 3 and the horizontal ribs 4 are fixed to the inner surface of each flat plate 2 to increase the overall rigidity. It has been made.

A spindle unit 5 includes a spindle 6. The spindle unit 5 includes a support guide 7 and a spindle drive motor (not shown), and is supported by rails 7a, 7a fixed on the front side plate 2. It is guided up and down via the guide table 7 and is moved up and down by an up and down driving device (not shown).

[0005]

In a box-shaped structure of this kind, slits s, s are formed in longitudinal side surfaces 1a, 1b opposed in the front-rear direction, as shown in FIGS. 8A and 8B. In some cases, it is necessary to insert the main shaft 6 through these slits s and s so that the main shaft 6 can be vertically moved. Here, FIG. A is a plan sectional view showing a state in which a main shaft is mounted on a box-shaped structure, and FIG.

However, if the structure shown in FIG.
The rigidity holding ability of the longitudinal side surfaces 1a and 1b opposed in the front-rear direction is reduced, and the connection of the left and right vertical side surfaces 1c and 1d is almost cut off. There is.

According to the present invention, the slits s, s are formed on the longitudinal side surfaces 1a, 1b facing each other in the front-rear direction as described above, and the main shaft 6 is inserted through these slits s, s to form a bridge-like arrangement. An object of the present invention is to provide a box-shaped structure for supporting a main shaft of a machine tool, which can be mounted vertically so as to be able to secure a necessary rigidity as a whole.

[0008]

In order to achieve the above object, according to the present invention, each of the right and left vertical side faces facing each other across the main shaft in a direction substantially perpendicular to the longitudinal side faces in the front-rear direction is appropriately adjusted. It is formed of a cylindrical member having a high bending rigidity.

[0009] The longitudinal side surface formed of such a cylindrical member has a significantly increased rigidity as compared with a flat plate assembled.
Even if the slit for inserting the main shaft is provided, the rigidity as a whole is secured to a necessary degree.

In the above-mentioned invention, the vertical portions forming the respective lateral ends of the left and right vertical sides opposed to each other so as to sandwich the main shaft in a direction substantially orthogonal to the longitudinal sides opposed in the front-rear direction are suitable. It is formed of a vertical cylindrical member having bending rigidity. With this configuration, the tubular member effectively contributes to an increase in overall rigidity due to the superiority of the installation position.

At this time, the longitudinal cylindrical members may be connected in the front-rear and left-right directions by a lateral cylindrical member. This makes it possible to obtain a box-shaped structure that has a relatively simple structure and allows the internal space to be viewed from the outside.

Further, the left and right vertical side surfaces opposed to each other so as to sandwich the main shaft in a direction substantially orthogonal to the vertical side surfaces opposed in the front-rear direction are closely arranged in parallel with a vertical cylindrical member having a length substantially covering the entire height. It can also be formed by forming. According to this, the vertical side surface is relatively easily formed only of the cylindrical member,
As a whole, the structure becomes simple and the rigidity becomes large.

Furthermore, the vertical cylindrical member having a vertical side surface has a cross section of a geometric shape such as a circle or a square, and a typical dimension of this cross section size is defined by the front, rear, left and right sides of the box-shaped structure for supporting the spindle. The length is preferably about 1/7 to 1/4 of the length in the direction. According to this, the tubular member can be easily manufactured, and the tubular member is formed to have an appropriate size with a small number of vertical side surfaces, and thus the assembly is facilitated.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
FIG. 1 shows a frame structure of a machine tool provided with a box-shaped structure according to the present invention. Reference numeral 8 denotes a base unit. The feed unit 11 is a column unit as the box-shaped structure 1 according to the present invention, which is slidably guided in the left-right direction via rails 12 fixed to the upper surface of the feed unit 9. A spindle unit 5 described later is mounted on the box-shaped structure 1.

Any of the units 1 except for the spindle unit 5,
8 and 9 are basically formed by connecting cylindrical members vertically and horizontally.

The box-shaped structure 1 and the spindle unit 5 will be described in more detail with reference to FIGS.
Here, FIG. 2 is a sectional plan view in which the upper part of the box-shaped structure is cut horizontally. As shown in these figures, the box-shaped structure 1 has slits s, s on longitudinal sides 1a, 1b facing each other in the front-rear direction, and the spindle unit 5 is inserted through these slits s, s. It is installed in a handover arrangement. At this time, the spindle unit 5 is attached to the support guide plate 7 by the spindle 6.
Are fixed horizontally and a motor 13 for driving the spindle is mounted on the rear end of the spindle case 6b.

Each of the left and right vertical side surfaces 1c and 1d opposed to the main shaft 6 in a direction substantially perpendicular to the longitudinal side surfaces 1a and 1b opposed in the front-rear direction is formed of a cylindrical member having appropriate bending rigidity. I have.

More specifically, the vertical portions forming the lateral ends of the left and right vertical side surfaces 1c and 1d are replaced with a vertical cylindrical member 14a extending over the entire height of the vertical side surfaces 1c and 1d. Formed. Then, the upper and lower ends of the cylindrical members are connected in the front-rear, left-right and left-right directions by lateral cylindrical members 14b and 14c having an appropriate cross-sectional size. Here, the vertical cylindrical member 14a has a typical cross-sectional size of about 1/7 to 1/4 of the length in the front-rear or left-right direction of the box-shaped structure 1.

A cylindrical guide member 14a on the front vertical side surface 1a,
Rails 7a, 7a are fixed to 14a, and the support guide plate 7 is guided by this.

The box-shaped structure 1 is provided with a vertical drive (not shown) for vertically moving the spindle unit 5 while the spindle 6 is horizontal. And a specific tubular member 14a
, The tip of the piston rod 15a is fixed to the support guide plate 7, and the weight of the main shaft unit 5 and the upward force of the piston rod 15a due to the fluid pressure in the cylinder 15 are balanced. The vertical displacement of the spindle unit 5 by the vertical drive unit can be performed with a small amount of power.

In the above-mentioned box-shaped structure, the fact that the whole is composed of the vertical cylindrical member 14a and the horizontal cylindrical members 14b and 14c is effective in simplifying the whole structure.

Further, the four vertical cylindrical members 14 are provided.
a is based on the superiority of the installation position, that is, the vertical side surfaces 1c, 1d
Rather than at a position closer to the center in the lateral direction of the box-shaped structure 1, it effectively contributes to an increase in rigidity of the entire box-shaped structure 1.

The typical dimension of the cross-sectional size of the vertical cylindrical member 14a is set to about 1/7 to 1/4 of the length in the front-rear or left-right direction of the box-shaped structure 1, so that the required rigidity is obtained. This makes it possible to economically obtain the necessary space with less labor for construction.

Next, a modified example of the box-shaped structure according to the present invention will be described. 3 and 4 show a first modified example, in which FIG. 3 is a perspective view of the entire box-shaped structure, and FIG. 4 is a plan sectional view showing a state in which the upper part thereof is cut horizontally.

In this modification, left and right vertical side surfaces 1c, 1d
Is a vertical cylindrical member 14a having a length substantially covering the entire height thereof.
Are closely arranged in parallel. According to this, the vertical side surfaces 1c and 1d can be relatively easily formed only by the cylindrical member 14a, the structure becomes simple as a whole, and the rigidity of the whole surface is large.

5 and 6 show a second modification. FIG. 5 is a perspective view of the entire box-shaped structure, and FIG. 6 is a cross-sectional plan view showing a state in which the upper portion is cut horizontally. It is.

In this modification, left and right vertical side surfaces 1c, 1d
Among the tubular members 14a formed with the above, those at both ends in the horizontal direction have a square cross section, and those at the inner side have a circular cross section. Also according to this, the utility according to the above-described modified example can be obtained.

[0028]

According to the present invention constructed as described above, the rigidity of the left and right vertical side surfaces can be increased by the cylindrical member even if the slits for mounting the main shaft are formed on the front and rear vertical side surfaces. Thus, the rigidity of the entire structure can be easily secured to a necessary degree.

According to the second aspect, the rigidity of the entire structure is effectively increased due to the superiority of the installation position of the tubular member. According to the third aspect,
It is possible to form a simple structure in which the corners are simply connected by a cylindrical member, or an approximate structure thereof. In addition, the internal space can be seen from the outside.

According to the fourth aspect of the present invention, the vertical side surface is relatively easily formed only of the cylindrical member, and the rigidity of the entire vertical side surface is increased, so that the rigidity of the entire structure is further increased. be able to.

According to the fifth aspect, each vertical side surface can be formed by a small number of cylindrical members, so that it is easy to assemble, and it is possible to obtain a space for the main shaft supporting guide having an appropriate vertical side surface thickness. Can be done.

[Brief description of the drawings]

FIG. 1 is a view showing a frame structure of a machine tool having a box-shaped structure of the present invention.

FIG. 2 is a cross-sectional plan view in which the upper part of the box-shaped structure of FIG. 1 is cut horizontally.

FIG. 3 is a perspective view showing a first modified example of the box-shaped structure.

FIG. 4 is a plan sectional view of the box-shaped structure of FIG.

FIG. 5 is a perspective view showing a second modification of the box-shaped structure.

FIG. 6 is a cross-sectional plan view of an upper portion of the box-shaped structure of FIG. 5 cut horizontally.

7A and 7B show a conventional box-shaped structure, wherein A is a perspective view, and B is a cross-sectional plan view in a state where an upper portion is cut horizontally.

8 shows a state in which a conventional box-shaped structure is deformed, wherein A is a perspective view, and B is a cross-sectional plan view of a state in which an upper portion is cut horizontally.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Box-shaped structure 1a, 1b Longitudinal side which opposes in the front-back direction 1c, 1d Right and left vertical side which oppose so that a main shaft may be interposed.

Claims (5)

[Claims] 1. A main shaft supporting box-shaped structure having slits on each of longitudinal side surfaces facing each other in the front-rear direction, and through which the main shaft is mounted so as to be vertically movable in a crosswise arrangement. Wherein the left and right vertical side surfaces facing each other so as to sandwich the main shaft in a direction substantially perpendicular to the vertical side surfaces are each formed of a cylindrical member having appropriate bending rigidity. Structure. 2. A vertical portion forming each lateral end of each of the left and right vertical sides opposed to the longitudinal side opposed in the front-rear direction so as to sandwich the main axis in a direction substantially orthogonal to the longitudinal side has appropriate bending rigidity. 2. The box-shaped structure for supporting a main shaft of a machine tool according to claim 1, wherein the box-shaped structure is formed of a vertically oriented cylindrical member. 3. A vertical portion forming each lateral end of each of the left and right vertical sides opposed to the longitudinal side opposed in the front-rear direction so as to sandwich the main axis in a direction substantially orthogonal to the longitudinal side has appropriate bending rigidity. 2. A box-shaped structure for supporting a spindle of a machine tool according to claim 1, wherein said cylindrical member is formed of a vertical cylindrical member, and the front, rear, left and right directions between said cylindrical members are connected by a horizontal cylindrical member. . 4. A structure in which a pair of vertical wall surfaces facing in a direction substantially orthogonal to a vertical side surface facing in the front-rear direction is formed by closely arranging vertical cylindrical members having a length substantially covering the entire height. The box-shaped structure for supporting a spindle of a machine tool according to claim 1, wherein: 5. A vertical cylindrical member having a vertical side surface having a cross section of a geometric shape such as a circle or a square, and a representative dimension of this cross section size is determined by the front, rear, left and right of a box-shaped structure for supporting a spindle. 5. The box-shaped structure for supporting a spindle of a machine tool according to claim 1, wherein the length is about 1/7 to 1/4 of the length in the direction.