JP2004142023A - Index table - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an index table with reduced restrictions in conditions of it use and usable for general purposes. <P>SOLUTION: In a rectangular parallelepiped frame 11, which composes the external shape of an index table 1, of four faces 5, 6, 7 and 8 that orthogonally link with the rotary table installation face 4, at least two or three whole faces among three faces 5, 6 and 7, excluding D face 8, to which a power source 13 for driving the rotary table 2 protrudes, are horizontally machined so that these three faces can be used as reference faces. In the prior arts, two index tables with power sources for the revolving tables installed linear-symmetrically were required, but this invention can deal with the situation only by changing the posture of one face and to use the maximum of the four faces as the reference faces, if the E face 9 opposite to the revolving table installation face 4 is also used as another reference face, its versatility is further improved. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an index table which is used in parallel with a machine tool to hold a workpiece and change the attitude of the workpiece.
[0002]
[Prior art]
When drilling or cutting a workpiece made of metal or the like, a machine tool called a machining center or a milling machine is used. The machine tool is composed of a spindle that holds and rotates tools such as end mills and drills, and a table that fixes the workpiece.The workpiece and the tool are relatively movable so that they can be machined freely. Is generally responsible for movement in the front-rear, left-right (X-axis and Y-axis) directions, and up-down (Z-axis) direction. If drilling holes of the same diameter on the top, front, and bottom surfaces of a rectangular parallelepiped workpiece, there is no need to change tools during the processing, but the workpiece will not be replaced every time processing of each surface is completed. It is necessary to remove the table from the table, change the posture, and continue processing again. Note that the equipment for holding a table or a workpiece has a plane which is called a reference plane and is processed into a planar shape, and this reference plane needs to match the coordinate system of the machine tool.
[0003]
In the above case, the work is removed from the table each time processing of each surface is completed, which takes time and increases the work time, but this problem is caused by interposing the index table between the work and the table. Resolve. The index table is a device provided with a disk-shaped rotary table on which a workpiece can be fixed, and the rotary table is held by a highly rigid frame. The frame is provided with a precisely finished reference surface so that it can be in close contact with a table of a machine tool, and the rotary table can be freely rotated by a power source such as a servomotor. Furthermore, the parallelism and the perpendicularity of the rotation surface of the turntable surface and the rotation axis serving as the center of rotation with respect to the reference surface are managed, and high-precision machining is realized. When placing the index table on the machine tool table, make sure that both reference surfaces are in close contact, firmly integrate them with bolts etc. while checking the accuracy, then attach the work to the rotary table and start work, By rotating the rotary table according to the progress of processing, a plurality of surfaces can be continuously processed.
[0004]
[Problems to be solved by the invention]
Since machine tools require high precision, the main structure tends to be large to secure rigidity.As a result, there is not enough room around the table, and if auxiliary equipment such as coolant piping is installed, There is even less room. In addition, the index table must hold the workpiece securely, and the rotary table must be positioned with high accuracy. A highly rigid frame is used, and a worm gear for reduction, brakes and sensors are installed inside. are doing. The servo motor that is the power source of the rotary table is mounted protruding from the side of the frame due to size and maintenance problems, and this servo motor may interfere with equipment on the machine tool side, avoiding restrictions during installation. Absent.
[0005]
In the conventional index table, since only one surface is used as a reference surface for four surfaces orthogonal to the table installation surface on which the rotary table is provided, for example, the bottom surface of the four surfaces is the reference surface, and the rotary table is the side surface. In the case of the standard model equipped, since there is no room in the space around the table of the machine tool, two types of arrangement of the servomotor with respect to the rotary table are required to be axisymmetric as shown in FIG. . Since these two types have different structures, they are often distinguished by giving individual model names (for example, adding -R and -L to the end of the model names), and the shapes of frames and the like are different even when manufactured. Individual design drawings are required. For this reason, the index table manufacturer is unavoidable to increase costs due to complicated management of design drawings and parts, and there is no danger of receiving the wrong type of index table due to misidentification at the time of ordering. is not.
[0006]
The present invention has been developed on the basis of such a situation, and an object of the present invention is to provide an index table which has few restrictions on use conditions and can be used for general purposes.
[0007]
[Means for Solving the Problems]
The above object is a rectangular frame having a rotary table, wherein a power source for driving the rotary table protrudes among four surfaces orthogonal to the rotary table installation surface of the frame. The problem can be solved by using an index table characterized in that at least two of the three surfaces except one surface are formed as reference surfaces. The index table includes a heavy rectangular parallelepiped frame for securing rigidity, and a rotary table is installed on one surface of this frame. In addition, the frame also needs a reference surface to be in close contact with the machine tool table, but a servo motor for driving the rotary table from four surfaces that are orthogonal and adjacent to the surface on which the rotary table is installed is used. By performing high-precision cutting or grinding on two of the remaining three surfaces except the surface on which the power source is mounted, the index table can be used as a reference surface for mounting the table on a machine tool table or the like.
[0008]
Conventionally, in the frame of the index table, only one of the four surfaces orthogonal to and adjacent to the rotary table installation surface has been used as a reference surface. The degree of freedom of the position of the protruding power source is improved. For example, when two opposite surfaces of the frame are used as reference surfaces and the table is installed on a machine tool with a horizontal surface, the servomotor is located on the right side of the rotary table with one reference surface facing down. From this state, the index table can be turned upside down to change the state where the servomotor is located on the left side with respect to the rotary table with the other reference surface facing downward.
[0009]
In order to further enhance the convenience by developing the invention according to claim 1, three of the four surfaces of the frame orthogonal to the rotary table installation surface, from which the power source does not protrude, as in the invention according to claim 2, All of them can be used as a reference surface, and a surface facing the rotary table installation surface can also be used as a reference surface. Thus, by adopting the inventions of claims 1 to 3, it becomes possible to use, as the reference surface, four surfaces out of all six surfaces outside the frame except for the surface on which the rotary table is installed and the surface from which the power source projects. As a result, it is possible to position the servo motor on the upper, right, and left sides with respect to the rotary table.
[0010]
The servomotor, which is the power source for rotating the index table, has a worm gear directly connected to the rotating shaft, and moves the rotary table at a very low speed and powerfully. Is housed in The worm gear has one end supported by a servomotor and the other end supported by a frame, but it is difficult to reduce the size of parts such as bearings that support the worm gear from the viewpoint of strength. When buried in the frame, the dimensions of the frame become excessively large, so that only the casing accommodating the bearing may project outside the frame.
[0011]
In order to use the surface on which the casing is present as a reference surface, the casing protrudes from a part of the surface facing the surface from which the power source protrudes, as in the invention according to claim 4. On the surface to be processed, the periphery of the casing is processed into a flat shape to form a reference surface. In this way, the surface where the casing is present is also processed into a plane other than the casing to function as a reference surface, but if this surface is brought into direct contact with the table of the machine tool, the casing naturally interferes with the machine tool. Therefore, it cannot be installed in a normal mode. This problem can be solved by using an interposer such as a base plate or a block between the machine tool and the index table, and the base plate is processed in a planar manner on both sides in the same manner as the reference surface, and also accommodates the casing. Cavity. When one surface having the cavity is brought into contact with the index table and the other surface is brought into contact with the table of the machine tool, the surface on which the casing is present can also be used as a reference surface.
[0012]
The reference surface, which is formed by processing the outer surface of the index table frame with high precision, does not necessarily need to be processed on the entire surface. In general, a pure reference plane is arranged in an island shape.
[0013]
The index table uses a servomotor as a power source for driving the rotary table in order to turn the workpiece with high accuracy, and rotates the rotary table at a reduced speed with a worm gear. Since this drive system handles heavy loads, paste-type grease has a problem in lubrication, and lubricating oil having a low viscosity is stored in the frame. For this reason, an oil gauge for monitoring the amount and state of the lubricating oil, and an oil plug and a drain plug for replenishing and discharging the lubricating oil are required. In the present invention, since the index table is used in various postures, at least two of the respective surfaces of the frame are provided with at least one of an oil gauge, a fuel tap and a drain tap as in the invention according to claim 5. Convenience is high if it is provided. When installing an oil gauge, oil filler plug, or oil drain plug on the reference plane, do not protrude from the reference plane to prevent interference with the machine tool, and place it on the same plane as the reference plane or at a position retracted from the reference plane. Install.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
1 and 2 show the structure of the index table of the present invention. FIG. 1A is a plan view and FIG. 1B is a front view. 2A is a left side view, FIG. 2B is a right side view, and FIG. 2C is a rear view. Here, it is assumed that the table 10 of the machine tool is an upward horizontal plane, and the upper surface of the table 10 is strictly controlled not only for flatness but also for perpendicularity and parallelism with respect to a coordinate system. Side reference plane. The index table 1 is composed of a rectangular parallelepiped frame 11, a disk-shaped rotary table 2, a power source 13 using a servomotor, and the like. It is possible to turn in the direction. Inside the frame 11, in addition to a bearing for supporting the rotary table 2 with high rigidity, a worm gear and a worm wheel gear for driving are incorporated, and a sensor for detecting position information of the rotary table 2 is shown. (Not shown) are also incorporated.
[0015]
The surface of the rotary table 2 is referred to as a rotating surface 3 in the present specification, and the rotating surface 3 is finished in a planar shape, does not generate a run-out due to turning, and has a clamper 22 for fixing the workpiece 21 to the rotating surface 3. In some cases, a female screw is formed on the rotating surface 3 so that it can be mounted. In FIGS. 1 and 2, the B surface 6 of the frame 11 is the bottom surface, but this surface is cut at high precision so that it can be used as a reference surface at right angles to the rotating surface 3. When the index table 1 is installed on the table 10 of the machine tool, as shown by the broken line in FIG. 1B, the holding plate is inserted into the fixing groove 12 formed on the side surface of the frame 11 in parallel to the reference surface. The table 10 and the holding plate are fastened by bolts.
[0016]
In addition to the B surface 6 serving as the bottom surface, the A surface 5 serving as the upper surface and the E surface 9 serving as the back surface are also processed with high precision so that they can be used as reference surfaces. The plane A (upper surface) 5 is perpendicular to the rotation axis 20, and is parallel to the plane B (bottom surface) 6. Therefore, when the E-plane (rear face) 9 is turned over so that it faces downward, the table 10 of the machine tool and the E-plane 9 come into surface contact, and the rotary table 2 can be used as facing upward, and the top and bottom are switched. The surface A (upper surface) 5 can be used by bringing it into surface contact with the table 10. In addition, the rotary table mounting surface (front) 4 and the upper surface A 5 are equipped with an oil gauge 23, a fuel tap 24 and a drain plug 25, respectively. In consideration of the above, two oil gauges 23 are attached. Also, in case that the E surface 9 is installed downward, the oil gauge 23 and the like are also provided on the B surface 6 (not shown). The lubrication plugs 24 and the like provided on the two reference surfaces A and B are mounted at positions retracted from the reference surface in order to prevent interference with a machine tool or the like.
[0017]
FIG. 3 shows a conventional situation where two types of index tables of the line symmetric type are required, and shows a situation in which the index table 1 according to the present invention is used. In FIG. The index table 1 is installed closer to the left with the B surface 6 facing down, and closer to the left with the A surface 5 facing downward. In this case, although the distance from the upper surface of the table 10 to the rotary shaft 20 is different in both cases, this point can be adjusted on the machine tool side, and there is substantially no problem. FIG. 3B is a plan view of the situation shown in FIG. 3A as viewed from above. In any case, the power source 13 projects in the same direction.
[0018]
Although the index table 1 of the present invention can use the three surfaces of the frame 11 as reference surfaces as described above, the convenience is further improved by using the other surface as the reference surface. In the frame 11, the rotary table installation surface 4 and the D surface 8 having the power source 13 are difficult to use as reference surfaces, but the C surface 7 facing the power source 13 can be used as a reference surface. However, the casing 14 that covers the bearing that supports one end of the worm gear that rotates the rotary table 2 protrudes from the C surface 7, and some countermeasures are required.
[0019]
FIG. 4 shows a configuration in which a base plate 15 is interposed between the table 10 and the C-plane 7 of the machine tool in consideration of the above points. In addition, a hollow portion 16 for accommodating the casing 14 is secured in the central portion. In addition, a plurality of bolt holes 17 used for fastening the index plate 1 to the base plate 15 are provided, and a relief groove 18 for burying the head of the bolt 19 is also machined. In addition, the C-side surface 7 of the frame 11 is also processed in a planar shape so that surfaces other than the casing 14 become reference surfaces. When the base plate 15 is used, the upper surface of the base plate 15 is brought into contact with the C surface 7 of the index table 1 as shown in FIG. It is fixed while performing positioning by bringing it into contact with the table 10.
[0020]
【The invention's effect】
According to the first, second and third aspects of the present invention, up to four surfaces of a rectangular parallelepiped frame constituting the index table can be used as reference surfaces. In the case where two types of index tables whose arrangement is line-symmetrical are required, the present invention can cope with only one type of posture conversion, and the same shape after reducing the number of parts when manufacturing the index table. Can be mass-produced, thereby lowering prices and shortening delivery times.
[0021]
According to the fourth aspect of the present invention, the surface on which the protrusion such as the casing exists on the outer surface of the frame can also be used as the reference surface. Therefore, the entire surface other than the rotary table installation surface and the power source installation surface can be used as the reference surface. Further improve.
[0022]
According to the fifth aspect of the present invention, by installing an oil gauge, a filler plug, and a drain plug on a plurality of surfaces of the frame, it is possible to supply, exchange, and monitor the lubricating oil regardless of the orientation of the index table. Since maintenance and inspection can be performed easily, problems such as poor lubrication can be prevented beforehand and reliability can be improved.
[Brief description of the drawings]
FIG. 1 (a) (b)
1 shows a structure of an index table according to the present invention, wherein (a) is a plan view and (b) is a front view.
FIG. 2 (a) (b) (c)
Fig. 3 shows a structure of an index table according to the present invention, wherein (a) is a left side view, (b) is a right side view, and (c) is a rear view.
FIG. 3 (a) (b)
In the index table according to the present invention, there are shown a case where the frame B is fixed to the machine tool with the surface B facing down, and a case where the frame A is fixed with the frame A facing down by changing the top and bottom. (B) is a plan view when viewed from above.
FIG. 4 (a) (b)
In the index table of the present invention, a case where a surface on which a casing is present is used as a reference surface, (a) is a perspective view showing an outer shape of a base plate, and (b) is a state where the index table is fixed with a base plate interposed therebetween. Is shown.
FIG. 5 is a perspective view showing a case where an index table having a conventional structure is used, and it is necessary to use two types of servomotors with respect to the rotary table which are symmetrical with each other depending on the use situation.
[Explanation of symbols]
1 Index table 2 Rotary table 3 Rotary surface 4 Rotary table installation surface 5 A surface (upper surface)
6 side B (bottom)
7 C side (left side)
8 D side (right side)
9 E side (back)
10 Table (machine tool side)
11 Frame 12 Fixed groove 13 Power source (servo motor)
14 Casing 15 Base plate 16 Cavity part 17 Bolt hole 18 Relief groove 19 Bolt 20 Rotating shaft 21 Workpiece 22 Clamper 23 Oil gauge 24 Oil plug 25 Oil drain plug

Claims (5)

A rectangular parallelepiped frame (11) having a rotary table (2), the rotary table (2) of four surfaces (5, 6, 7, 8) orthogonal to the rotary table mounting surface (4) of the frame (11). An index table characterized in that at least two of the three surfaces (5, 6, 7) excluding the surface (8) from which the power source (13) for driving the motor protrudes are formed as reference surfaces. The index table according to claim 1, wherein all of the three surfaces (5, 6, 7) are formed as reference surfaces. 3. The index table according to claim 1, wherein a surface (9) facing the rotary table installation surface (4) is formed as a reference surface. A casing (14) projects from a part of the surface (7) facing the surface (8) from which the power source (13) projects, and the casing (14) projects from the casing (14). The index table according to any one of claims 1 to 3, wherein the periphery of (14) is processed into a planar shape and is formed as a reference surface. At least two of the surfaces (4, 5, 6, 7, 8, 9) of the frame (11) have at least one of an oil gauge (23), a fuel tap (24) and a drain tap (25). 5. The electronic device according to claim 1, wherein when one of these is provided on the reference surface, the device is provided on the same surface as the reference surface or at a position retracted from the reference surface. 6. Index table.

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