JP2818167B2 - 3-axis composite table - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-axis composite table capable of efficiently processing a work having a complicated shape in combination with a machine tool. 2. Description of the Related Art When a workpiece having a number of processing surfaces that are not orthogonal to each other is processed by a machine tool such as a machining center,
In order to arbitrarily set a relative angle of a workpiece with respect to a tool axis of a machine tool, a so-called tilted circular table has been developed. In this apparatus, a tilting frame is provided on a fixing base so as to be tiltable and indexable, and a rotary table rotatable and indexable is mounted on the tilting frame. Therefore, when a workpiece is set on a rotary table, the rotary indexing of the rotary table and the tilting index of the tilting frame are combined, so that the relative angle of the workpiece with respect to the tool axis of the machine tool is considerably wide. It is possible to reduce the chances of setting up the work during the work, reduce the machining time, and prevent the work accuracy from being reduced due to the setup setting. In addition, if such a tilting circular table is mounted on another rotating rotary table and used, the tilt index of the tilting frame,
In addition to the rotary indexing of the rotary table, the rotary indexing of the rotary rotary table can be combined, and the versatility can be further increased. Therefore, a tilted circular table used for high-precision machining of a complicated die or the like is generally used in such an embodiment. Problems to be Solved by the Invention According to such a conventional technique, the inclined rotary table must be used in combination with a rotary rotary table on which the rotary table can be mounted. The problem that the table is bent to lower the processing accuracy and that the overall height becomes excessively large and the processing area of the machine tool becomes narrow is inevitable.
In addition, for this purpose, an excessively large machine tool must be used, which is extremely inconvenient. Accordingly, an object of the present invention is to solve the above-mentioned problems of the prior art, and to completely integrate the rotating rotary table and the tilting rotary table, which have been separately configured in the related art, and to provide the rotation indexing mechanism of the intermediate base with the bottom base. Another object of the present invention is to provide a novel three-axis composite table capable of minimizing the overall height and achieving a significant reduction in size and weight as a whole by accommodating the positioning function of the intermediate base. Means for Solving the Problems The configuration of the present invention for achieving the above object includes a bottom base, an intermediate base rotatably indexed on the bottom base, and a pair of bearings, which are mounted on the intermediate base. A worm and a worm, each of which includes a tilt frame that is rotatably mounted on the tilt frame and a rotary table that is rotatably indexable on the tilt frame, and a bottom base that forms a rotary index mechanism of an intermediate base. The gist of the present invention is that the worm wheel is housed therein, and the worm wheel is fixed to the lower surface of the intermediate base and the outer periphery is slidably fitted in a positioning guide hole formed in the bottom base. According to the configuration of the present invention, the work set on the rotary table is combined with the rotary index of the intermediate base, the tilt index of the tilt frame, and the rotary index of the rotary table, so that the workpiece is set on the tool axis. The relative angle can be set arbitrarily. The worm and worm wheel forming the rotation indexing mechanism of the intermediate base are housed in the bottom base, and slidably fit into the positioning guide holes formed in the bottom base on the outer periphery of the worm wheel. By doing so, a positioning function for positioning the rotation center axis of the intermediate base can be provided, so that the overall height can be minimized and the size and weight can be reduced. Embodiments Hereinafter, embodiments will be described with reference to the drawings. The 3-axis composite table has a bottom base 10 and an intermediate base
20, an inclined frame 30 and a circular table 40 are combined (FIGS. 1 and 2). The bottom base 10 is a horizontally long rectangular plate-shaped member, and the length of its short side is selected to be slightly larger than the diameter of the circular table 40. Steps 11 and 11 for fixing are formed on both short side end surfaces of the bottom base 10, and a guide hole 12 for positioning is formed in a center part thereof.
Figure). However, the outer periphery of a worm wheel 22 fixed to the lower surface of the intermediate base 20 is slidably fitted in the guide hole 12. On the bottom surface of the bottom base 10, recesses 13, 13 ...
Are formed regularly, and a space portion 14 for accommodating the worm 21 and the worm wheel 22 is formed. Also, at the four corners of the bottom base 10, legs 15,
15 ... is attached. A pair of suspension rings 17, 17,... Are projected from both end surfaces on the long side of the bottom base 10 (FIGS. 1, 2). The intermediate base 20 is smaller than the long side of the bottom base 10,
A circle having a diameter larger than the short side is cut out along a chord parallel to the long side of the bottom base 10 to form a combination of two parallel straight lines and a pair of arcs facing each other (FIG. 5). The intermediate base 20 is mounted on the bottom base 10 as a whole,
The rotation indexing can be performed with respect to the bottom base 10 via a worm 21 and a worm wheel 22 forming a rotation indexing mechanism. A worm wheel 22 is fixed to the center of the lower surface of the intermediate base 20 via a center shaft 22a and a set screw 22b (FIG. 4). On the other hand, a worm 21 that meshes with the worm wheel 22 is supported on the lower surface of the bottom base 10 via bearing brackets 21a, 21a (FIG. 5). The extension shaft 21b of the worm 21 protrudes from one end surface on one long side of the bottom base 10, and the distal end of the extension shaft 21b has an operation handle 2
1c can be attached. An index scale 21d is attached to the base of the extension shaft 21b (FIG. 1). The arc portion forming the periphery of the intermediate base 20 has a step portion 23,
23 are formed, and a stepped portion is formed on the upper surface of the bottom base 10.
, Which are engaged with 23, 23 are provided.
That is, the intermediate base 20 can be clamped to the bottom base 10 at any rotational position via the clamps 16, 16,. A vernier scale 24 for indicating the rotation angle of the intermediate base 20 is provided on one arc portion of the intermediate base 20 (FIG. 2). At both ends of the upper surface of the intermediate base 20, a pair of bearings 25, 25 which support the inclined frame 30 are formed.
FIG. 3). A worm case 26 is formed on the inner surface side of one of the support portions 25, and a worm 31 for tilting the inclined frame 30 is provided on the worm case 26.
Is stored. The inclined frame 30 is connected to the shafts 33, 33, the bearings 25, 25,
It is mounted on the intermediate base 20 so as to be able to be indexed. The inclined frame 30 has a pair of substantially fan-shaped clamp pieces 32, 32 formed at both end portions in contact with the support portions 25, 25. Each clamp piece 32 is formed with a curved elongated hole 32b, and the inclined frame 30 after the inclined indexing is provided with clamp bolts 32c, 3c.
By clamping 2c, it can be clamped to any inclination angle. The clamp piece 32 on the side corresponding to the worm case 26 has worm teeth 32a engraved on the outer periphery,
The worm teeth 32a mesh with the worm 31 in the worm case 26. The worm 31 is arranged obliquely in the tangential direction of the clamp piece 32. The shaft 31a of the worm 31 is
And an operation handle 31c can be attached via the extension shaft 31b. On the lower surface of the inclined frame 30, a worm 41 is incorporated in parallel with the axes 33, 33 (FIG. 1).
a is extended to the outside, and an operation handle 41b is attached. The worm 41 and the shaft 41a are housed in a worm case 34 formed integrally with the inclined frame 30. The circular table 40 is rotatably indexed at the center of the upper surface of the inclined frame 30 via a radial bearing and a thrust bearing (not shown). On the upper surface of the circular table 40, work setting dovetail grooves 42 are formed radially. Also, on the lower surface of the circular table 40,
A large-diameter worm wheel 43 meshing with the worm 41 is formed. On the periphery of the circular table 40, the inclined frame 30
Clamp bolts 35, 35 that are screwed on are disposed, and the clamp bolts 35, 35 can clamp the indexed rotary table 40. The three-axis composite table having such a configuration is set on a work table of a machine tool (not shown),
A work (not shown) is fixed and used. At this time,
It is convenient to take the column side of the machine tool on the arrow C side in FIGS. 1 and 2 and the operator side on the arrow W side. The intermediate base 20 has a worm 2
1.Because rotation indexing is possible via the worm wheel 22, first operate the operating handle 21c to move the intermediate base 2
A rotation angle θ3 of 0 is set, and the intermediate base 20 is clamped by the clamps 16, 16,. Here, it is generally sufficient that the rotation angle θ3 has a setting range of ± 45 ° with respect to the diameter direction of the circular table 40 coincident with the arrow C. Subsequently, by operating the operation handle 31c,
Worm 31 and worm tooth 32a engraved on clamp piece 32
The inclination angle θ2 of the inclined frame 30 is set through the above, and the inclined frame 30 is clamped using the clamp bolts 32c, 32c. The tilt angle θ2 is determined from the position at which the circular table 40 on the inclined frame 30 is horizontal (θ2 = 0 °, solid line in FIG. 2) to the position at which the circular table 40 vertically faces the column side (θ
It is sufficient if the range up to 2 = 90 ° and the two-dot chain line in FIG. Next, the rotation angle θ1 of the rotary table 40 is set via the worm 41 and the worm wheel 43 by the operation handle 41b, and the rotary table 40 is similarly clamped by using the clamp bolts 35. However, the rotation angle θ1 can be in the range of θ1 = 0 to 360 ° around a rotation center axis (hereinafter, referred to as α-axis and denoted by α in the drawing) of the rotary table 40. As described above, the rotation angle θ1, the inclination angle θ2, and the rotation angle θ
When 3 is set to a predetermined value, the work set on the circular table 40 can be set at an arbitrary angle relative to the tool axis of the machine tool. The worm wheel 22 fixed to the lower surface of the intermediate base 20 is slidably fitted on the outer periphery of the guide hole 12 of the bottom base 10 so that the rotation center axis of the intermediate base 20 (hereinafter referred to as the γ axis). No., indicated by γ in the figure). The γ axis is assumed to be on the same straight line as the α axis when setting the inclined frame 30 so that the circular table 40 is horizontal (FIGS. 2 and 3). So, the circle table
In the case of 40, even if the intermediate base 20 rotates, the position of the α-axis does not rotate, so that the work setup work can be extremely simplified. The rotation center axis of the tilt frame 30 when setting the tilt angle θ2 of the tilt frame 30 is
, Which is hereinafter referred to as the β axis, and β
Indicated by Other Embodiments The shafts 31a and 41a of the worms 31 and 41 are
6 can be disposed in parallel with the extension shaft 21b, and a shaft end can be provided on the operator side (FIGS. 6 and 7). Further, at this time, the entire extension shaft 21b, shafts 31a and 41a may be concentrated on the right side when viewed from the worker side (FIG. 7). Extension shaft 21b,
Since the shafts 31a and 41a can be uniformly accessed, high operability can be easily realized. The γ-axis, together with the α-axis lying on the same straight line, can be decentered from the mechanical center O of the bottom base 10 to the column side (the same figure). Even if the intermediate base 20 is rotated by the same rotation angle θ3, the projecting dimension of the intermediate base 20 protruding from the bottom base 10 toward the column can be reduced, so that the column of the machine tool and the α-axis are brought close enough. This is advantageous for realizing high precision machining. At this time, the long side on the column side of the bottom base 10 and the straight line on the column side among the two parallel straight lines forming the outer shape of the intermediate base 20 are made to coincide with the circumference of the circular table 40, or By being located on the α-axis side than
The movable range of the column can be maximized (Fig. 3). It should be noted that the relative positions of the α axis, β axis, and γ axis can be arbitrarily determined. That is, the α axis and the γ axis do not necessarily have to be on the same straight line, and
The axis may be separated from both the α axis and the γ axis,
At least one of the γ axes may be orthogonal to the same plane. Advantageous Effects of Invention As described above, according to the present invention, according to the present invention, a bottom base, an intermediate base rotatable with respect to the bottom base, an inclined frame which is rotatably indexable on the intermediate base, Combining the rotary indexable rotary table with the frame, and storing the worm and the worm wheel, which are the rotary indexing mechanism of the intermediate base, in the bottom base, the bottom base can be used for other parts after the intermediate base. In addition to functioning as a fixing base for mounting members, it also houses a rotary indexing mechanism for the intermediate base, so the overall height is lower than in the conventional case where the rotary circular table and the inclined circular table are individually combined. There is an excellent effect that it is possible to reduce the size and weight while minimizing the size. In addition, the rotation indexing mechanism of the intermediate base also has a positioning function of positioning the rotation center axis of the intermediate base by slidably fitting the outer periphery of the worm wheel that forms it into the guide hole of the bottom base. Therefore, when assembling the worm wheel to the intermediate base, the axes of both can be automatically matched to each other, achieving high assembly accuracy extremely easily. Since there is no need to provide an engaging step or the like for positioning, there is also a practically excellent effect that the overall height can be reduced and the manufacturing cost can be greatly reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 to FIG. 5 show an embodiment, FIG.
2 is a partially cutaway side view, FIG. 3 is a front view, FIG. 4 is a central vertical sectional view of a bottom base portion, and FIG. 5 is a partially cutaway bottom view. 6 and 7 show another embodiment, FIG. 6 is a side view,
FIG. 7 is a plan view. O Mechanical center α, β, γ Rotation center axis 10 Bottom base 12 Guide hole 16 Clamp 20 Intermediate base 21 Worm 22 Worm wheel 25 Bearing 30 …… Incline frame 40 …… Circular table

Claims (1)

(57) [Claims] A bottom base, an intermediate base rotatably indexed on the bottom base, an inclined frame pivotally mounted on the intermediate base via a pair of bearings so as to be capable of being indexed on the intermediate base, and rotating on the inclined frame; A circular table mounted indexably, wherein the bottom base houses a worm and a worm wheel forming a rotary indexing mechanism of the intermediate base, and the worm wheel is disposed on a lower surface of the intermediate base. A three-axis composite table, wherein the outer periphery is slidably fitted into a positioning guide hole formed in the bottom base. 2. The bottom base is formed in a horizontally long rectangle having a clamp on an upper surface, and the intermediate base is formed by forming a circle having a diameter larger than a short side of the bottom base and smaller than a long side into a chord parallel to the long side of the bottom base. 3. The three-axis composite according to claim 1, wherein the clamp has a combination shape of two parallel straight lines cut out along the arc and a pair of arcs, and the clamp is arranged corresponding to the arc of the intermediate base. table. 3. 3. The three-axis composite table according to claim 1, wherein the rotation axes of the intermediate base and the circular table are on the same straight line. 4. 4. The rotation center axis of the inclined frame is orthogonal to at least one of the rotation center axes of the intermediate base and the circular table in the same plane. 3 axis composite table. 5. The three-axis composite table according to any one of claims 1 to 4, wherein a rotation center axis of the intermediate base is eccentric from a mechanical center of the bottom base.