JPH0829471B2 - Positioning and fixing device for workpieces - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a positioning and fixing device for positioning and fixing a workpiece and an object to be measured on a rotation axis, and particularly to a lens and a holding frame of the lens. The present invention relates to a workpiece positioning and fixing device for performing centering processing and processing such as cutting the outer periphery of a holding frame.

[Prior Art] Conventionally, an apparatus shown in FIG. 6 has been used as an apparatus for positioning and fixing a workpiece on a rotary shaft. In such a device, a base 2 is fixed to a lathe main spindle 1, and an XY table 3 is movable in the base 2 only in a direction perpendicular to a central axis A of the base 2 by a guide surface 2a formed on the base 2. And the base 2 facing the central axis A and the tips 5a of two adjusting screws 5 provided on the base 2 at a relative angle of 90 degrees and facing the central screw A. It is pressed by the two springs 6 provided at the position. Further, in the XY table 3, a tilt table 7 having a screw hole 7a for mounting a work formed on the upper surface thereof is a guide surface 3a which can be tilted around the center of curvature of a guide surface 3a formed on the XY table 3. Is held slidably on the
To the XY table 3 facing the central axis B of the XY table 3.
The tips 8a of two tilt table adjusting screws 8 provided at a relative angle of 90 degrees and two springs 9 provided at the position of the XY table 3 facing the adjusting screws 8 are pressed.

According to the apparatus having the above configuration, when performing centering adjustment of a work fixed on the upper surface of the tilt table 7, position adjustment in a direction perpendicular to the rotation axis of the lathe main spindle 1 (horizontal direction) is performed by the XY table. The adjustment screw 5 is rotated to adjust the tilt direction by rotating the tilt table adjustment screw 8, and the adjusted position is adjusted to the respective adjustment screws 5 and 8.
And the springs 6 and 9 fix and hold them.

[Problems to be Solved by the Invention] However, the above conventional device has the following problems.

That is, the XY table 3 and the tilt table 7 have adjustment screws 5 and 8
And the springs 6 and 9 are positioned and held respectively, so when the center of gravity of the XY table 3, tilt table 7, work, etc. is deviated from the rotation axis of the lathe spindle 1 during machining of the lathe, the lathe spindle A centrifugal force acts on the XY table 3, tilt table 7, and work with the rotation of 1, and the holding force of the adjusting screws 5, 8 and springs 6, 9 causes the work to be displaced and the desired machining cannot be performed. was there. Also, with the lathe main spindle 1
Even when the center of gravity of the XY table 3, the tilt table 7, and the work is not displaced, the work moves due to an external force acting on the work during cutting, and there is a problem similar to the above.

Further, the guide surfaces 2a, 3 of the XY table 3 and the tilt table 7
It is very difficult to form a without play, and if a desired guide surface is formed, it becomes an expensive device. In addition to the problem of economy, the position adjustment is performed in the direction orthogonal to the lathe spindle 1 and the position adjustment is performed in the inclined direction. There is a problem that the structure is complicated because the parts are configured differently, the height of the device itself becomes high, and the rigidity becomes low.

The present invention has been made in view of the above-mentioned problems, and a workpiece positioning and fixing device having a high rigidity and a simple structure that can process a workpiece without displacement even if a centrifugal force or an external force is applied. For the purpose of providing.

[Means for Solving Problems] In the present invention, as shown in the conceptual diagram of FIG. 1, a base 20 fixed to the lathe main spindle 1 and a central axis 20b of the base 20 guided by the base 20 are provided. Three sets of position adjusting members 23 composed of two upper and lower wedges 21 and 22 which are movable in a right angle direction and which are held by the base 20 at a relative angle of 120 degrees and whose front end portions 21a and 22a are inclined surfaces. Inclined surfaces 24a, 24 contacting the inclined surfaces 21a, 22a of the wedges 21, 22 of the three sets of position adjusting members 23, respectively.
b A work mounting member 24 formed on the outer periphery and movably held in the base 20 by the position adjusting member 23.

[Operation] In the above configuration, the wedge guided by the base 1
Inclined surfaces 21a and 22a of 21,22 and taper surface of work mounting member 24
The work mounting member 24 is held by 24a and 24b (second
(See FIG. A). When the wedges 21 and 22 are moved to the left by the same distance from the state of FIG. 2a, the work mounting member 24 is moved to the left (see FIG. 2b), and only the upper wedge 21 is moved to the left. The workpiece mounting member 24 moves leftward and upward (see FIG. 2c), and the lower wedge
When only 22 is moved to the left, the work mounting member 24 moves to the left and moves downward (see FIG. 2d). Therefore, the work mounting member held in the base 20 by the three sets of position adjusting members 23 including the upper and lower wedges 21 and 22.
The position of 24 can be adjusted in a direction perpendicular to the rotation axis 1a of the lathe main spindle 1 and a direction in which it is inclined.

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

(First Embodiment) FIG. 3 shows a first embodiment of a workpiece positioning and fixing device according to the present invention. FIG. 3a is a front view with a part cut away, and FIG. 3b is FIG. 3a. 6 is a sectional view taken along line XX of FIG.

Reference numeral 30 in the drawing denotes a workpiece positioning and fixing device. This fixing device 30 includes a base 31 fixed to the rotary spindle 1 such as a lathe, and a position adjusting member 32 rotatably provided on the base 31. The position adjusting member 32 is movably held in the base 31 and is composed of a work attaching member 33 for attaching a workpiece.

The base 31 is provided with guide portions 34 for rotatably guiding the position adjusting member 32 at three positions at a relative angle of 120 degrees in the circumferential direction of the base 31. The guide portion 34 is formed by two parallel upper and lower guide holes 35 and 36 which penetrate the outer surface 31a and the inner surface 31b of the base 31 in a direction orthogonal to the central axis 31c of the base 31. On a side surface 35a of the guide hole 35, a tap 37a is formed in a direction orthogonal to the central axis 31c, and a nut rod 37 having a position adjusting screw 38 with which the position adjusting member 32 and the tip 38a abut is fixed. There is. Further, a spring case 41 in which a push rod 39 and a spring 40 are set is fixed to the other side surface 35b of the guide hole 35 so that the push rod 39 can bias the position adjusting member 32 in the direction of the central axis 31c by the spring 40. It is configured. On the other hand, in the guide hole 36, the spring case 4 is provided on the side surface 36a.
1, the nut rod 37 is fixed to the other side surface 36b, and the guide hole 35
The spring case 41 and the nut rod 37 fixed to the above are arranged at positions symmetrical to each other.

The position adjusting member 32 is composed of two wedges 43 and 44 with the tips 43a and 44a as inclined surfaces. The wedge 43 positions the inclined surface 43a upward, and the wedge 44 positions the inclined surface 44a downward and guides them respectively. It is inserted into the holes 35 and 36 and is guided by the guide holes 35 and 36 so as to be rotatable around pins 45 and 46 attached to the base 31. The pins 45 and 46 are provided at positions displaced from the centers 43b and 44b of the wedges 43 and 44, and the distance between the tip ends 43a and 44a of the wedges 43 and 44 and the central shaft 31c by the adjusting screw 38 and the push rod 39. Can adjust the wedge 43,44
Is configured to be pivotally positioned about the pins 45 and 46.

The workpiece mounting member 33 has tapered surfaces 33a and 33b formed on the outer peripheral surface 33f that contact the tips 43a and 44a of the wedges 43 and 44, and are held in the base 31 by the wedges 43 and 44. The part is the inclined surface 43a, 4 of the wedge 43,44 as shown in FIG.
4a and either or both of the tapered surfaces 33a and 33b of the workpiece mounting member 33 are formed as curved surfaces to make point contact.
On the upper surface 33c of the work mounting member 33, there are screw holes 5 for mounting the work.
0 is provided, and in the figure, the toy 52 to which the work 51 is attached is fixed to the work attachment member 33 with the screw 53. Further, the work mounting member 33 is formed with a hollow inside 33d, and is configured so that laser light for position measurement such as centering adjustment of the work can pass through.

When the device 51 having the above-mentioned configuration is used to horizontally move to the left in the figure to position and fix the work 51, the adjustment screw
When 38 is rotated and screwed in, the wedge 43 is pressed by the tip 38a of the adjusting screw 38. The wedges 43 and 44 are rotated around the pins 45 and 46, and the pins 45 and 46 are provided at positions deviated from the centers of the wedges 43 and 44, so that the tips 43 of the wedges 43 and 44 are formed.
a, 44a are moved in the direction of the central axis of rotation of the main shaft 1, and the wedge 43,
44 inclined surfaces 43a, 44a and work mounting member 33 taper surfaces 33a, 3a
The work attaching member 33 is pressed while contacting with 3b, and the work attaching member 33 is moved in the pressing direction. On the other hand, when the adjustment screw 38 is screwed in, the adjustment screw 38 on the side where the workpiece mounting member 33 is moved (hereinafter, although not shown, the same member as the screwing side will be described with the same reference numerals). When loosened, the push rod 39 rotates the wedges 43, 44 about the pins 45, 46, and the tips 43a, 44a of the wedges 43, 44 and the work mounting member 33.
The contact with the tapered surfaces 33a and 33b is released. Therefore, the work 51 is positioned and fixed at a predetermined position by screwing and loosening the adjustment screw 38 by a predetermined amount. When positioning the work by raising, lowering or inclining the work mounting member 33, the amount of loosening and adjusting of the adjusting screw is adjusted as described above to adjust the amount of movement of the wedges 43, 44. be able to.

According to this embodiment, the work mounting member is held by the six contact points with the wedge, and the necessary holding force can be generated by screwing the adjusting screw. In addition, the movement of the wedge base 31 toward the center (31c) of the wedge is reduced relative to the axial movement of the adjusting screw, and the generated force is large, so it is easy to make fine adjustments, and the adjusting screw is small. A large holding force can be obtained even if it is rotated by force.

Further, since the shapes of the base and the work mounting member are rotationally symmetric with respect to the central axis, vibration caused by unbalance is less likely to occur when rotating, vibration during rotation, centrifugal force, or cutting work etc. It is possible to prevent the movement of the work, which has been precisely positioned, by the external force on the work.

In FIG. 3, the tips 43a, 44a of the wedges 43, 44 are linearly inclined surfaces (gradients), but not limited to this, the tips 43a, 44a of the wedges 43, 44 are curved as shown in FIG. May be formed,
Further, the tapered surfaces 33a and 33b of the work attaching member 33 may also be formed as curved surfaces.

(Second Embodiment) FIG. 5 is a partially broken front view showing a second embodiment of the workpiece positioning and fixing apparatus according to the present invention.

In the apparatus 50 of this embodiment, an O-ring 51 is provided between the inner diameter end surface 31d of the base 31 and the lower end surface 33e of the work mounting member 33, and the outer peripheral surfaces 33 of the upper and lower parts of the work mounting member 33 are provided.
Circumferential grooves 52, 53 are formed in the f, O-rings 54, 55 are mounted in the grooves 52, 53, respectively, and the work mounting member 33 and the base 31 are attached.
O-rings 54 and 55 are interposed between the inner side surfaces 31b. The other parts of the configuration are the same as those of the first embodiment, and therefore the same parts are designated by the same reference numerals and the description thereof is omitted.

In this embodiment, the inclined surfaces 43a and 44a of the wedges 43 and 44 are attached to the work mounting member when the adjusting screw 38 is not sufficiently screwed in.
Even when the taper surfaces 33a and 33b of 33 are not in contact with each other, the work mounting member 33 is attached to the base 31 without backlash.
It can be retained inside, and when positioning and fixing the work, the wedge 43
When the inclined surface 43a (44a) of (44) presses the taper surface 33a (33b) of the work mounting member 33, the work mounting member 33 is moved by the wedge 43 (44) while the O-rings 54 and 55 are compressed and deformed. Positioned.

Therefore, according to the present embodiment, it is possible to achieve the same effect as that of the first embodiment, and to position the work mounting member and the base without rattling while pushing the wedge little by little by inserting the O-ring. You can In addition, instead of the O-ring, it is possible to achieve the same effect as the above-mentioned effect by using an elastic body such as a spring.

[Advantages of the Invention] As described above, according to the present invention, a holding force capable of reliably holding a workpiece after positioning can be obtained, movement during processing can be prevented, and a compact structure of the apparatus with a simple configuration. And cost reduction.

[Brief description of drawings]

FIG. 1 is a conceptual view of the device according to the present invention, FIGS. 2a to 2d are explanatory views showing the operating state of the device according to the present invention, and FIG. 3 shows a first embodiment of the device according to the present invention. Fig. 3a is a front view with a part broken away, Fig. 3b is a plan view taken along the line X-X of Fig. 3a, and Fig. 4 is a contact state between the inclined surface of the wedge and the tapered surface of the workpiece mounting member. FIG. 5 is a front view showing a second embodiment of the apparatus according to the present invention with a part broken away, and FIG. 6 is an explanatory view of the prior art. 1 …… Rotating spindle 20 …… Base 20b …… Center shaft 21a, 22a …… Tip 21,22 …… Wedge 23 …… Position adjusting member 24a, 24b …… Tapered surface 24 …… Workpiece mounting member

Claims (1)

[Claims] 1. A device for positioning and fixing a workpiece, which is mounted on a spindle such as a lathe, a hollow base mounted on the spindle, a work mounting member loosely fitted in a hollow portion of the base, and the work mounting. A workpiece positioning and fixing device comprising a position adjusting member mounted on the base so that the member can be pressed and moved in a direction orthogonal to the axial direction to position and fix the member.