JPS6029256A - Swing system - Google Patents

Abstract

PURPOSE:To reduce rotary swing of a center rod by fixing adjustable load applying means at plural positions on the flange face of the center rod and securing to the rotary surface plate. CONSTITUTION:A center rod 29 is fixed to a rotary surface plate 11 to mount a work 13 having central hole such as an original video disc on a mounting table 12 and position thus to perform working on the circumferential face. The base section of said rod 29 is made to a tapered shaft 24 which is fixed into a tapered hole 22 of the surface plate 11. A flange 25 is provided to the tapered shaft 24 and pressed against the surface plate through a screw 26 and a click 27. The screws 26 and clicks 27 are provided at plural positions on the circumference to minimize the rotary swing of the center rod 29 by adjusting them.

Description

Detailed Description of the Invention: This invention involves rotating the rotation center rod to improve concentricity when processing several plates with round holes at once using a rotation center rod. This invention relates to a tilting device that is mounted accurately at right angles to the surface of a surface plate and is adjusted and fixed to minimize rotational runout.

Conventionally known devices of this type include those shown in FIGS. 1 and 2. In the figure, l indicates rotating surface plate 1.
2 is a rotation center rod, 3 is a chuck main body, DA is a presser claw, J is a worm screw for moving the presser claw l back and forth in the direction of the center of the chuck body 3, and O is a mounting screw.

Next, the operation of the conventional device will be explained based on FIG. Insert the rotation center rod d into the chuck body 3 and tighten the worm screw j
Turn the handle with the handle to advance the four presser claws toward the center of the chuck, and temporarily fix the rotating center rod d. Next, an indicator is placed on the rotational center rod J, and the four worm screws J are gradually tightened so that the rotational runout in one rotation is minimized. In addition, the presser nails are made using raw nails that are not hardened.
In some cases, the tip of the presser claw is shaved in advance to match the diameter of the rotation center rod so that the rotation center rod can be fixed at right angles to the upper surface of the rotation surface plate.

The conventional tilting device using a four-jaw single-acting chuck tightens the four worm screws 6 while adjusting the rotation center rod.
Since it is fixed by discontinuous line contact, it takes time to set the rotation center rod d so that the rotational twist is small.
In addition, there was a drawback that the rigidity value measured by the lateral load on the rotational center rod d was also low. Furthermore, there are other drawbacks, such as the perpendicularity of the rotational center rod to the rotational surface plate cannot be easily obtained, and it is necessary to separately adjust the minute angle.

Furthermore, a device to reduce the rotational runout of the rotation center rod,
There is something shown in FIG. 2 according to the invention of the present invention. In the figure, / is a rotating surface plate having a tapered hole 7, C is a rotating center rod integrated with a tapered shaft, and 8 is a drawing screw. When the rotation center rod d is inserted into the taper hole 7 which is machined to have good concentricity (coaxiality) with the bearing part of the rotating surface plate, and the taper shaft is further pulled deeply l\\ by the draw puller 8, the taper part The rotational center rod is fixed so that the rotational runout of the rotational center rod is minimized. However, even with this method, the perpendicularity to the surface of the rotating surface plate has an error of 58# as an example of measurement. Even if an attempt was made to process the outer diameter, the eccentricity would be just over 14 μIT+ at a distance of 100 μInlm, which is not a satisfactory fixing method for the rotation center rod.

The tilting device of this invention was made to eliminate the above-mentioned conventional drawbacks, and has a tapered shaft at the tip.
A rotating center rod having a flange portion on the outer diameter is inserted into the rotating surface plate in a direction perpendicular to the rotating surface plate on the tapered shaft, and
Adjustable loads can be applied to several appropriate locations on the flange portion of the rotation center rod. It is an object of the present invention to provide a tilting device which can thereby fix a rotation center rod at a good right angle to the surface of a rotating surface plate, and which can also perform centering with high precision in disk processing of several plates that have been pre-whitened. The purpose is

An embodiment of the present invention will be described below with reference to the drawings. Third
The figure shows a chamber shaft type cylindrical grinder, // is a rotating surface plate, /e2
is the workpiece mounting table, /3 is the workpiece, /da is the grinding wheel,
7.5 is a physical plate to be processed, /A is a hydraulic system, /7 is a transverse feed motor that moves the workpiece side base -lO (described later) in the X-axis direction, 18 is a bed, /n is a column 1, Reference numeral 20 indicates a workpiece side base 1.2/ indicates a plate. In FIG. 4 showing the details of the rotating surface plate //, 1.2, 2 is the tapered hole 1.23 formed in the rotating surface plate // is the lower taper shaft, 2
1.2A is a collet chuck integrally formed with a flange and a flange 5. ．． 27 is a hardened claw for tilt adjustment 1. ．． ? Reference numeral 8 indicates a female threaded portion 1 for a tapered shaft drawing screw, 27 indicates a rotation center rod, and 30 indicates a bearing.

Next, the operation of a chamber shaft type cylindrical grinder using the tilting device of the present invention will be explained. Pass the workpiece /3, which has been whitened in advance, through the rotation center rod core and fix it with the presser plate 7.5.
The grinding wheel is rotated by a rotating surface plate and processed by a grinding wheel that rotates at high speed. By moving the grinding wheel /+t in the X-axis direction by the cutting wheel shaft vertical movement device inside, the entire outer periphery of the workpiece /3 is machined into a round shape. In addition, the machining diameter is determined by the distance between the axis center line of the rotating surface plate l/ and the tip of the grinding wheel/llt, and by displacing the base on the workpiece side in the X-axis direction by the transverse feed motor 17, any machining Get the diameter. Since this device aims to process a large amount of material with good coaxiality and with a single cutter 1-, there is a rotating center rod 2? which centers the workpiece.
It is important to fix the Also, if the white diameter is small, the rotation center rod, 2? It is thought that centering errors occur due to deflection.

As for the processing specifications for workpiece No. 3, there are many cylindrical (disc) shaped items with an inner diameter machined, and the coaxiality (concentricity) of the inner diameter machined part and the outer diameter machined part is, for example, a glass disk for a video disk master. In the case of ・Many products require high precision of 15μI11 or less. Hence,
If the coaxiality of the 100I+111 workpieces on the workpiece stage/2 is required to be 15 μm or less, the eccentricity of the center rod -7 for one revolution must be less than that. -For example, on a surface plate with a taper hole, is the taper shaft =? Rotating center rod with da, 2? When fixed, the eccentricity error near the surface plate surface was quite small at 0.6μI11, but the perpendicularity to the surface plate surface was quite large at 58#. Therefore, the rotation center rod, 2? The present invention was developed because it was necessary to correct the perpendicularity error with respect to the surface plate after the rotary surface plate l/ was placed at the center of rotation.

Next, the operation of the tilting device of the present invention will be explained with reference to FIG. The collet chuck with the above-mentioned taper shaft, 21I, and the flange surface of 23 are provided with a claw d applying the lever principle.
A load is applied to the tilt adjustment screw 2B to produce an extremely small angular displacement.

This will be explained using a more detailed example.

National Taper No. 40 was used as the taper shaft, M16 was used as the drawing screw, and a rotary surface plate with a diameter of 290 mm was used. In addition, the rotation center rod d has a diameter of 20 mm, a length of 250 mm, a circularity of 2 μm or less, and a coaxiality of 5 μm.
For the one below J'jL, a collet chuck was used as the chuck. Furthermore, adjust the screw diameter of the tilt adjustment screw 2 to M8.
And so.

The rotation center rod in the above case, 2? We will explain the measurement results of rotational runout. Rotation runout before tilt adjustment,
Figures 5 (A) and (B) show the rotational runout after tilt adjustment.
Shown below. According to it, the rotational runout ranges from 28μm to 1.4μm.
It can be seen that the value is improved to μIn. Rotation center rod, 2
Cholera when a load is applied to the tip of the wo to generate a moment 1 - The center of rotation near the chuck, 2? The inclination angle is 6.5' at 215kg-u+I11, and the chuck has high rigidity. Using this as an actual workpiece, the diameter of the circular hole is 7.3.
111111 When nine sheets of soda lime glass with a thickness of 8III11 are stacked and processed with a diamond grindstone to form a glass disk for a video disc master, the concentricity of the top layer of glass that is stacked 71 times is 8 μIn, and that in the middle is 6 μIn.
We obtained a good result of m. 4 In the above embodiment, four claws for tilt adjustment were used to act on the flange surface, but three or more claws may be provided, and in any case, the tilt adjustment can be made sufficiently, and the above The same effects as in the embodiment are achieved. In addition, although Cholera 1 to Chuck [Kuroda Seiko Co., Ltd. 1] were used as the chuck, for example, a flange may be formed on a structure in which the Taber shaft d and the rotation center rod 27 are integrated. Even if a load is applied only by the tilt adjustment screw, the same effects as in the above embodiment can be obtained.

As described above, according to the present invention, the rotation center rod, 2? It is possible to make minute tilt adjustments, which has the effect of machining highly concentric discs with ease.

In addition, by discontinuously applying the load from the flange surface,
The work can be done entirely on the surface plate without the need for a pulling screw, and the rigidity of the entire chuck makes work easy and has the excellent effect of being stable at high precision.

[Brief explanation of drawings]

Fig. 1 is a plan view and a front view showing a conventional four-jaw scroll chuck, Fig. 2 is a plan view and a front view showing a tilting device simply consisting of a tapered hole and a draw screw, and Fig. 3 is a plan view and a front view showing a tilting device of the present invention. A front view of a spindle-type cylindrical grinder using the device in the main part, FIG. 4(A) is a sectional view showing an embodiment of the tilting device of the present invention, and FIG. 4(B) is a perspective view of the main part. , Figure 5 (
p, ), (B) is a graph showing that the rotational runout value of the rotation center rod is reduced by the present invention. Il, , Rotation constant * i, :y, , Workpiece, 2,2
．． ,, Tapered hole ,, 2 da 01. Tapered shaft, 2.5. ,
, flange , 2 Otsu 09. Tilt adjustment screw, 27. ,
, nails , 2? ,,,Rotation center rod Fig. 1 Fig. 2 Fig. 4 <A)

Claims (1)

[Scope of Claims] / 1. When processing several plates with circular holes at once using a rotating center rod, the flange surface of the rotating center rod fixed to a rotating surface plate Adjustable load applying means (= tilting device characterized by 1 digit) are installed at multiple locations. 2. The rotating center rod has a tapered shaft formed at its tip. The tilting device according to claim 1, which comprises: 3. The adjustable load applying means is comprised of a pawl that incorporates a tilt adjustment screw and is attached to a rotating surface plate and that applies the principle of a lever. , the flange device according to claim 1 or 2, wherein the pawl acts on the flange surface. 4. The flange and the pawl each form a predetermined gap with respect to the rotating surface plate surface. A tilting device according to claim 3 comprising: