JP2005153121A - Feed system structure and machine tool with it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a feed system structure and a machine tool with it capable of lengthening a feed stroke of a movable body (inner frame) without enlarging a structural body (outer frame) (without enlarging a machine outer size) in a box-in-box structure or the like. <P>SOLUTION: A saddle 6, which is the inner frame of a rectangular shape holding a main spindle 2 inside, is situated inside of a column 5 which is the outer frame of a rectangular shape. In this box-in-box structure, the column 5 has a structure in an X-axis direction in which ribs 5c are projectingly formed on an inner surface 5b of a frame plate 5a and the saddle 6 has a structure in the X-axis direction in which ribs 6c are projectingly formed on an outer surface 6b of a face place 6a. The ribs 5c of the column 5 and the ribs 6c of the column 6t are disposed at positions where they are parallel with each other and they overlap each other without interfering with each other when the saddle 6 is moved. In a Y-axis direction, the ribs 5c and the ribs 6c are disposed at positions where they are parallel with each other and overlap each other and they do not interfere with each other when the saddle 6 is moved. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a feed system structure and a machine tool including the same.

  In general, a feed system structure of a machine tool such as a machining center has a structure in which a feed guide is provided on the outer surface of a fixed structure, and the moving structure is linearly moved by feed driving means such as a feed screw. For example, it has a structure (back column structure) in which a moving structure (saddle) is arranged in front of a fixed structure (column). In this case, since the feed thrust vector applied to the moving body from the fixed side does not pass through the center of gravity of each other, a moment is generated in the moving body to cause vibration and deformation, which causes deterioration in machining accuracy.

  Therefore, for this measure, the fixed side is a rectangular outer frame (box-shaped structure), a rectangular inner frame (box-shaped moving body) is placed inside this outer frame, and a feed screw, etc. The feed thrust vector applied to the inner frame from the outer frame side by making the inner frame linearly move parallel to the outer frame (box-in-box structure) by the feed driving means of 2. Description of the Related Art Feeding system structures that can be directed toward each other's center of gravity are known. In this case, the outer frame and the inner frame have a rectangular cross-section (see FIG. 5) and have sufficient thickness to ensure rigidity.

  Patent Document 1 discloses a machine tool in which a box-in-box structure is adopted as a part of a feed system structure.

Japanese Patent Laid-Open No. 10-263960

  However, in order to prevent the generation of moment, it is desirable that the feed system structure is a box-in-box structure. However, in the conventional box-in-box structure, the cross-sectional shape of the outer frame and the inner frame is rectangular and the same structure is used. Since the rigidity of the frame is ensured by providing a sufficient thickness, the inner frame (spindle) can be fed when the outer dimensions of the machine are the same compared to general machine tools that do not have a box-in-box structure. There is a disadvantage that the stroke is shortened (see FIG. 5, details will be described later). In other words, in order to obtain a feed stroke having the same length as that of a general machine tool not having a box-in-box structure, the outer frame has to be enlarged, and the outer dimensions of the machine are increased. For this reason, for example, problems such as the inability to install the machine tool in a limited space in a part of the production line occur.

  Therefore, in view of the above circumstances, the present invention increases the feed stroke of the moving body (inner frame) in a box-in-box structure or the like without increasing the structure (outer frame) (without increasing the outer dimension of the machine). It is an object of the present invention to provide a feed system structure that can be used and a machine tool including the same.

The feed system structure of the first invention that solves the above problem is a feed system structure in which a movable body that is movable along a guide surface provided in the structure is moved in a first direction by a feed drive means.
A first structure rib projecting in the first direction is provided on an inner surface of the structure facing in the first direction;
A first moving body rib projecting in the first direction is provided on an outer surface of the moving body facing the first direction;
In addition, the first structure rib and the first moving body rib are provided at positions where they overlap without interfering with each other when the moving body moves in the first direction. .

The feed system structure of the second invention is the feed system structure of the first invention.
The guide surface is provided inside the structure,
The moving body is arranged inside the structure.

The feed system structure of the third invention is the feed system structure of the first or second invention.
The first structure rib is provided so as to project parallel to the first direction,
The first moving body rib is provided so as to protrude in parallel to the first direction.

Further, the feed system structure of the fourth invention is the feed system structure of any one of the first invention to the third invention,
A plurality of the first structure ribs are provided on the inner surface of the structure facing the first direction,
A plurality of the first moving body ribs are provided on the outer surface of the moving body facing in the first direction,
The first moving body rib and the first moving body rib are arranged between the first moving body ribs when the moving body moves in the first direction. The ribs are provided so as to be arranged.

Further, the feed system structure of the fifth invention is any one of the feed system structures of the first invention to the fourth invention,
A second structure rib projecting in the second direction is provided on the inner surface of the structure facing in a second direction orthogonal to the first direction;
A second moving body rib projecting in the second direction is provided on the outer surface of the moving body facing the second direction orthogonal to the first direction;
In addition, the second structural body rib and the second moving body rib overlap each other, and are provided at positions that do not interfere with each other when the moving body moves in the first direction. And

Further, the feed system structure of the sixth invention is the feed system structure of any one of the first invention to the fifth invention,
The second structure rib is provided so as to project parallel to the second direction,
The second moving body rib is provided so as to protrude in parallel to the second direction.

Further, the feed system structure of the seventh invention is the feed system structure of any one of the first invention to the sixth invention,
A plurality of the second structure ribs are provided on the inner surface of the structure facing the second direction,
A plurality of the second moving body ribs are provided on the outer surface of the moving body facing in the second direction,
The second structure ribs and the second moving body ribs do not interfere with each other when the moving body moves in the first direction. 1 moving body rib is provided so that it may be arrange | positioned.

  A machine tool according to an eighth aspect is characterized by including any one of the feeding system structures according to the first to seventh aspects.

  According to the feed system structure of the first invention, the first structure rib projecting in the first direction is provided on the inner surface of the structure facing the first direction, and the first structure rib is provided. A first moving body rib projecting in the first direction is provided on an outer surface of the moving body facing in the direction, and the first structural body rib and the first moving body rib are Since the movable body is provided at a position that overlaps without interfering with each other when the movable body moves in the first direction, the first structural body rib and the first movable body rib include The moving body can be moved until it is overlapped (overlapped). For this reason, the feed stroke of the movable body can be lengthened without increasing the size of the structure (without increasing the outside dimension of the machine).

  According to the feed system structure of the second invention, the guide surface is provided inside the structure, and the moving body is arranged inside the structure. By having a structure, it is possible to prevent vibration and deformation due to the generation of moments and improve machining accuracy, and the first structure rib and the first moving body rib overlap as described above. Since the movable body can be moved until it reaches a state, the feed stroke of the movable body can be lengthened without enlarging the structure (without increasing the outside dimension of the machine).

  According to the feed system structure of the third aspect of the invention, the first structure rib is provided so as to project in parallel with the first direction, and the first moving body rib is the first structure rib. Since it is provided so as to protrude in parallel to the direction, the first structural body rib and the first structure can be easily and surely moved when the movable body moves in the first direction. The moving body ribs can overlap so as not to interfere with each other.

  According to the feed system structure of the fourth aspect of the invention, a plurality of the first structure ribs are provided on the inner surface of the structure facing the first direction, and the first moving body rib is A plurality of the first structure ribs and the first mover ribs when the movable body moves in the first direction. Since the first moving body rib is provided between the first structure ribs, the first movement between the first structure ribs is provided. The moving body can be moved until the body rib is arranged. For this reason, the feed stroke of the movable body can be lengthened without increasing the size of the structure (without increasing the outside dimension of the machine).

  According to the feed system structure of the fifth aspect of the invention, the second structure rib projecting in the second direction is provided on the inner surface of the structure facing the second direction orthogonal to the first direction. A second moving body rib projecting in the second direction is provided on the outer surface of the moving body provided in a second direction orthogonal to the first direction, and the second The structure rib and the second moving body rib overlap each other, and are provided at positions that do not interfere with each other when the moving body moves in the first direction. Without increasing the size of the body (without increasing the outside dimensions of the machine), the rigidity of the structure can be increased, and for example, a main shaft or the like inside the moving body along the guide surface provided on the moving body When moving another moving body in the second direction by the feed driving means, It is possible to lengthen the feed stroke of the other mobile.

  According to the feed system structure of the sixth aspect of the invention, the second structure rib is provided so as to protrude in parallel with the second direction, and the second moving body rib is the second structure rib. Since it is provided so as to protrude in parallel with the direction, the first structural body rib and the first structure can be easily and surely moved when the movable body moves in the first direction. The movable body ribs can be prevented from interfering with each other when they overlap each other.

  According to the feed system structure of the seventh invention, a plurality of the second structure ribs are provided on the inner surface of the structure facing the second direction, and the second moving body ribs A plurality of outer surfaces of the movable body facing in the direction of 2, and the second structural body rib and the second movable body rib interfere with each other when the movable body moves in the first direction. The first moving body rib is disposed between each of the second structure body ribs so that the structure body is not enlarged (the outer size of the machine is increased). Without increasing the rigidity of the structure, and for example, another moving body such as a main shaft is moved inside the moving body along the guide surface provided on the moving body by the feed driving means. When moving in the direction of 2, the feed stroke of the other moving body It can be lengthened.

  According to the machine tool of the eighth invention, it is characterized by having a feed system structure, so that a machine tool with excellent machining performance having the effect of any one of the first to seventh inventions is realized. be able to.

  Embodiments of the present invention will be described below in detail with reference to the drawings.

  1 is a perspective view of a feed system structure of a machine tool (machining center) according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, and FIG. 3 is a line BB in FIG. FIG. 4 is an explanatory diagram showing a state when the inner frame of the feed system structure is moved, and FIG. 5 is an explanatory diagram showing a state when the inner frame is moved in a conventional feed system structure (box-in-box structure). It is.

  As shown in FIGS. 1, 2, and 3, on the bed 1, a feed system structure unit 4 is provided for linearly moving the main shaft 3 as a feed object. A tool 2 is attached to the front end portion of the main shaft 3. Although not shown, the bed 1 is also equipped with a table arranged so as to be positioned in front of the feed system structure 4, an automatic tool changer for automatically changing the tool 2, and the like. ing. And the workpiece | work installed in the table is processed with the various tools 2 with which the spindle 3 was mounted | worn with the automatic tool changer.

  At this time, the tool 2 can be linearly moved in the X-axis direction and the Y-axis direction indicated by arrows in the drawing along with the main shaft 3 by the feed system structure portion 4, and the workpiece is shown in the drawing by the feed system structure portion provided on the table. The table can be linearly moved together with the table in the Z-axis direction indicated by an arrow. The X, Y, and Z axis directions are orthogonal to each other, the X axis direction is the left and right horizontal direction, the Y axis direction is the vertical (vertical) direction, and the Z axis direction is the front and rear horizontal direction.

  The feed system structure 4 of the machine tool, which will be described in detail later, prevents the generation of moment by allowing the feed thrust vector applied to the moving body from the fixed side to pass through the center of gravity of each other. A saddle 6 which is a rectangular inner frame as a moving body is arranged inside a column 5 which is a rectangular outer frame, and the saddle 6 is linearly moved in parallel with the main shaft 3 and the column 5 in the column 5. The structure of the column 5 and the saddle 6 is devised in order to have a box-in-box structure and to increase the feed stroke of the main spindle 3 without increasing the outside dimensions of the machine. Although details will be described later, the saddle 6 moves in the X-axis direction, and the head stock 7 moves in the Y-axis direction inside the saddle 6.

  The column 5 is a frame plate 5a formed in a rectangular shape as an outer frame main body, and a plurality of (four in the illustrated example) projecting from the inner side surface 5b of the frame plate 5a to reinforce the frame plate 5a. The rib 5c is structured. Each rib 5c protrudes at a predetermined interval, and the cross-sectional shape of the column 5 is comb-like as shown in FIG. Each rib 5c includes a first column rib 5c-1 as a first structure rib and a second column rib 5c-2 as a second structure rib, and the inner surface of the frame plate 5a. As shown in FIG. 2, the first column rib 5c-1 protrudes in parallel with the same direction in the moving direction (X-axis direction) of the saddle 6 as shown in FIG. As shown, in the direction (Y-axis direction) orthogonal to the moving direction of the saddle 6, the second column rib 5 c-2 protrudes in parallel to the same direction. In addition, the height (length in the protruding direction) of the rib 5c (5c-1, 5c-2) is high enough to obtain a predetermined strength and maintain high rigidity.

  On the other hand, the saddle 6 has a frame plate 6a formed in a rectangular shape as an inner frame main body, and a plurality of sheets (3 in the illustrated example) protruding from the outer surface 6b of the frame plate 6a to reinforce the frame plate 6a. Sheet) rib 6c. Each rib 6c protrudes at a predetermined interval, and the cross-sectional shape of the saddle 6 is also comb-teeth as shown in FIG. Each rib 6c includes a first saddle rib 6c-1 as a first moving body rib and a second saddle rib 6c-2 as a second moving body rib, and the outer surface of the frame plate 6a. As shown in FIG. 2, in the moving direction of the saddle 6 (X-axis direction), the first saddle rib 6c-1 protrudes in parallel to the same direction as shown in FIG. As shown, the second saddle rib 6c-2 projects in parallel to the same direction in the direction orthogonal to the moving direction of the saddle 6 (Y-axis direction). The height of the rib 6c (6c-1, 6c-2) (length in the protruding direction) is high enough to obtain a predetermined strength and maintain high rigidity, and the column 5 The height is equal to or less than the height of the rib 5c (5c-1, 5c-2).

  The rib 5a of the column 5 and the rib 6a of the saddle 6 are provided at positions that are parallel to each other and do not interfere with each other by shifting the pitch. That is, as shown in FIG. 2, in the movement direction (X-axis direction) of the saddle 6, the first column rib 5c-1 of the column 5 and the first saddle rib 6c-1 of the saddle 6 are parallel to each other in FIG. As shown, even if the saddle 6 moves and the first column rib 5c-1 and the first saddle rib 6c-1 approach each other, they do not interfere with each other, and the first saddle rib is interposed between the first column ribs 5c-1. It is provided in the overlapping position where 6c-1 is arranged. Further, as shown in FIG. 3, in the direction orthogonal to the moving direction of the saddle 6 (Y-axis direction), the second column rib 5c-1 of the column 5 and the second saddle rib 6c-1 of the saddle 6 A second saddle rib 6c-2 is disposed between each of the two column ribs 5c-2 and overlaps with each other in parallel. As shown in FIG. 4, the second column rib is moved when the saddle 6 moves in the X-axis direction. The 5c-2 and the second saddle rib 6c-2 are provided at positions that do not interfere with each other. That is, when the saddle 6 moves in the X-axis direction, the saddle 6 moves in a direction perpendicular to the paper surface in FIG. 3, so that the second column rib 5c-2 and the second saddle rib 6c-2 interfere with each other. Saddle 6 can move without

  As shown in FIG. 2, a spindle housing 8 is provided inside the saddle 6 via a headstock 7. The main shaft housing 8 accommodates a main shaft 3 rotatably supported on the main shaft housing 8 via a bearing, and an electric motor 9 that rotationally drives the main shaft 3.

  On the other hand, as shown in FIG. 3, between the rib 5c of the column 5 and the rib 6c of the saddle 6 (two places on the upper side and two places on the lower side), a linear motor 10 as a feed driving means is interposed. Yes. Further, in the direction (Y-axis direction) orthogonal to the moving direction (X-axis direction) of the saddle 6, the end portions 5c-3 of the second column ribs 5c-2 located at both ends in the width direction of the column 5 are It is bent inward in the width direction and is parallel to the frame plate 6 a of the saddle 6. A linear guide 11 serving as a guide surface is interposed between the rib tip 5c-3 and the frame plate 6a (two places on the upper side and two places on the lower side). Is supported by the column 5 through the linear guide 11 so as to be movable in the X-axis direction.

  Therefore, the saddle 6 is guided by the linear guide 11 together with the main shaft 3 by the driving force of the linear motor 10 and can linearly move in parallel with the column 5 in the X-axis direction. The feed driving means in the X-axis direction is not limited to the linear motor 10 and may be, for example, a feed driving means including a feed screw and an electric motor that rotationally drives the feed screw.

  Further, as shown in FIG. 2, a linear motor 12 as a feed driving means is interposed between the saddle 6 and the head stock 7 (upper and lower two places). A protrusion 7b is formed on the front portion of the outer peripheral surface of the main body 7a of the headstock 7, and between the headstock protrusion 7b and the front end of the saddle 6 (upper and lower two locations) and the headstock Between the main body portion 7a and the inner side surface of the saddle 6, linear guides 13 as guide surfaces are interposed. The head stock 7 is supported by the saddle 6 through these linear guides 13 so as to be movable in the Y-axis direction.

  Therefore, the main shaft 3 is guided by the linear guide 13 together with the main shaft housing 8 and the head stock 7 by the driving force of the linear motor 12, and can be linearly moved in parallel to the column 5 in the Y-axis direction. The feed driving means in the Y-axis direction is not limited to the linear motor 12 and may be, for example, a feed driving means including a feed screw and an electric motor that rotationally drives the feed screw.

  As described above, according to the present embodiment, the saddle 6 that is a rectangular inner frame that holds the main shaft 3 inside is disposed inside the column 5 that is a rectangular outer frame, and the linear motor 10 or the like. With this structure, the saddle 6 is linearly moved in parallel with the main shaft 3 and the column 5 in the column 6 by the feed driving means (box-in-box structure), so that vibration and deformation due to moment generation are prevented and machining accuracy is improved. Can be improved.

  The column 5 has a structure in the movement direction (X-axis direction) of the saddle 6, and the first column rib 5c-1 is parallel to the X-axis direction on the inner side surface 5b of the frame plate 5a (both left and right side plate portions). The saddle 6 has a structure in the X-axis direction, and the first saddle rib 6c-1 projects parallel to the X-axis direction on the outer surface 6b of the frame plate 6a (both left and right side plate portions). A position where the first column rib 5c-1 of the column 5 and the first saddle rib 6c-1 of the saddle 6 are parallel to each other and do not interfere with each other when the saddle 6 moves. Therefore, the feed stroke in the X-axis direction of the saddle 6 (main shaft 3) can be lengthened without increasing the column 5 (without increasing the outside dimension of the machine).

  That is, when the cross-sectional shape of the column 55 and the saddle 56 is rectangular as in the conventional box-in-box structure shown in FIG. 5, when the saddle 56 is moved in the X-axis direction, the saddle 56 The outer face plate 56 a can only move to a position where it interferes with the inner face plate 55 a of the column 55. That is, the saddle 56 cannot be moved so that the column 55 and the saddle 56 overlap. Therefore, in order to further increase the feed stroke of the saddle 56, the column 55 must be enlarged, resulting in an increase in the outer dimensions of the machine. In contrast, in the present embodiment, as shown in FIG. 4, the saddle 6 is in a state where the first saddle rib 6 c-1 of the saddle 6 and the first column rib 5 c-1 of the column 5 overlap (overlap). Therefore, the feed stroke of the saddle 6 (main shaft 3) can be lengthened without enlarging the column 5 (without increasing the outside dimension of the machine).

  Furthermore, in the present embodiment, the column 5 has a structure in a direction (Y-axis direction) orthogonal to the moving direction of the saddle 6 and the second column rib on the inner side surface 5b of the frame plate 5a (top plate portion and bottom plate portion). 5c-2 has a structure projecting in parallel with the Y-axis direction, and the saddle 6 has a structure in the Y-axis direction, the second saddle rib 6c on the outer surface 6b of the frame plate 6a (top plate portion and bottom plate portion). -2 projecting parallel to the Y-axis direction, and the second column rib 5c-2 of the column 5 and the second saddle rib 6c-2 of the saddle 6 overlap each other in parallel. Since the saddle 6 is provided at a position where the saddle 6 does not interfere with each other, the column 5 and the saddle 56 are not enlarged as compared with the case where the cross-sectional shapes of the column 55 and the saddle 56 are rectangular as shown in FIG. Y axis of main spindle 3 without increasing it) It is possible to increase the feed stroke of the direction.

  The present invention relates to a feed system structure and a machine tool such as a machining center equipped with the feed system structure. For example, the present invention can be applied to a case where a box-in-box structure is adopted as a feed system structure. The feed stroke of the moving body (inner frame) can be lengthened without increasing the frame) (without increasing the outside dimension of the machine).

1 is a perspective view of a feed system structure of a machine tool (machining center) according to an embodiment of the present invention. It is AA arrow sectional drawing of FIG. It is a BB arrow directional cross-sectional view of FIG. It is explanatory drawing which shows a state when the inner frame of the said feeding system structure moves. It is explanatory drawing which shows a state when an inner frame moves in the conventional feeding system structure (box-in-box structure).

Explanation of symbols

1 Bed 2 Tool 3 Spindle 4 Feed system structure 5 Column (outer frame)
5a frame plate 5b inner side surface 5c rib 5c-1 first column rib 5c-2 second column rib 5c-3 tip 6 saddle (inner frame)
6a Frame plate 6b Outer side surface 6c Rib 6c-1 First saddle rib 6c-2 Second saddle rib 7 Headstock 7a Main body 7b Protrusion 8 Spindle housing 9 Electric motor 10 Linear motor 11 Linear guide 12 Linear motor 13 Linear guide

Claims (8)

In a feed system structure in which a movable body that is movable along a guide surface provided in the structure is moved in a first direction by a feed driving means,
A first structure rib projecting in the first direction is provided on an inner surface of the structure facing in the first direction;
A first moving body rib projecting in the first direction is provided on an outer surface of the moving body facing the first direction;
In addition, the first structural body rib and the first moving body rib are provided at positions where they overlap without interfering with each other when the moving body moves in the first direction. Feed system structure. In the feed system structure according to claim 1,
The guide surface is provided inside the structure,
The moving system is characterized in that the moving body is arranged inside the structure. In the feed system structure according to claim 1 or 2,
The first structure rib is provided so as to project parallel to the first direction,
The feed system structure according to claim 1, wherein the first moving body rib is provided so as to project in parallel to the first direction. In the feed system structure according to any one of claims 1 to 3,
A plurality of the first structure ribs are provided on the inner surface of the structure facing the first direction,
A plurality of the first moving body ribs are provided on the outer surface of the moving body facing in the first direction,
The first moving body rib and the first moving body rib are arranged between the first moving body ribs when the moving body moves in the first direction. A feed system structure characterized in that a rib is provided. In the feeding system structure according to any one of claims 1 to 4,
A second structure rib projecting in the second direction is provided on the inner surface of the structure facing in a second direction orthogonal to the first direction;
A second moving body rib projecting in the second direction is provided on the outer surface of the moving body facing the second direction orthogonal to the first direction;
In addition, the second structural body rib and the second moving body rib overlap each other, and are provided at positions that do not interfere with each other when the moving body moves in the first direction. The feed system structure. In the feed system structure according to any one of claims 1 to 5,
The second structure rib is provided so as to project parallel to the second direction,
2. The feed system structure according to claim 1, wherein the second moving body rib is provided so as to protrude in parallel with the second direction. In the feeding system structure according to any one of claims 1 to 6,
A plurality of the second structure ribs are provided on the inner surface of the structure facing the second direction,
A plurality of the second moving body ribs are provided on the outer surface of the moving body facing in the second direction,
The second structure ribs and the second moving body ribs do not interfere with each other when the moving body moves in the first direction. A feed system structure characterized in that one moving body rib is provided. A machine tool comprising the feed system structure according to any one of claims 1 to 7.

Images