JPS6348667B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a sphere machining device that simultaneously grinds a plurality of spheres, and in particular, although not limited thereto, it relates to a sphere machining device suitable for machining spheres made of ceramics.

[Technical background of the invention and its problems]

Spheres are widely applied in various technical fields as a component of various devices, and in particular, spheres made of ceramics are attracting attention for their application to special uses that take advantage of their corrosion resistance, heat resistance, abrasion resistance, etc. In general, regardless of whether the sphere is made of ceramics or not, it is required to have a certain diameter with good sphericity, and therefore a processing device suitable for this is required. Thus, for relatively large spheres, one at a time
In many cases, individual spheres are processed, but for relatively small spheres, it is desirable to process many spheres at the same time.

FIG. 1 shows an example of this, in which a steel disc-shaped press plate 2 is coaxially opposed to a steel disc-shaped lap plate 1, and a spherical workpiece is placed between these lap plates 1 and 2. A guide plate 3 that supports S is installed.
A plurality of spherical workpieces S are supported by support portions formed on the same circumference of the guide plate 3, and are fitted into the V-shaped annular groove 1a of the wrap plate 1, thereby preventing the rotation of the push plate 2 and the push plate. It rolls in the annular groove 1a due to the pressure applied through 2, and during this time, a wrapping agent is supplied from the outside and processed.

However, in this processing device, not only the pressurization applied via the press plate 2, the amount of wrapping agent supplied, and the interval between the wrapping agents slightly affect the amount of wrapping, but also the cross-sectional shape of the V-shaped annular groove 1a, and the The cross-sectional shape is second
As shown in the figure, it sometimes changes over time due to wear, making it extremely difficult to perform proper machining with high efficiency.

[Purpose of the invention]

The object of the present invention is to obtain a sphere processing device that grinds a plurality of spheres appropriately and with high efficiency.

[Summary of the invention]

The upper surface of the grinding plate is formed by a grinding wheel, the grinding plate is eccentric to the push plate installed opposite to it, and a guide plate supporting a plurality of spherical workpieces on the same circumference is attached to the grinding plate and the push plate. The grinding plate and the pressing plate were installed between the plates and rotated together to process the spherical workpiece.

[Embodiments of the invention]

Hereinafter, the present invention will be described based on embodiments with reference to the drawings.

FIG. 3 is a sectional view showing an embodiment of the present invention, in which a grinding plate 10 and a pressing plate 20 are installed so that the grinding surface and the pressurizing surface of the spherical workpiece face each other in parallel, and a guide plate 30 is placed between the two surfaces. The structure is such that there is an intervening structure.
Therefore, the grinding plate 10 has a disk-shaped support portion 11.
and an annular grindstone 12 integrally fixed to the outer periphery thereof, one end surface of this grindstone 12 serving as a grinding surface. A rotary shaft 13 rotated by a drive device (not shown) is vertically attached to the support portion 11, and the grinding plate 10 is mounted around the rotary shaft 13 in the axial direction of the rotary shaft 13 (in the direction of the push plate). ) is provided with a cylindrical advancement/retraction shaft 14 for advancing and retracting. Reference numeral 15 denotes a support portion that supports the reciprocating shaft 14 so as to be slidable in its axial direction. The push plate 20 is made of, for example, steel and has a disk shape, and is eccentric with respect to the grinding plate 10 . A rotating shaft 21 that is rotated by a drive device (not shown) is erected in the center of the push plate 20, and around this rotating shaft 21, the push plate 20 is moved by a pressure device (not shown). A cylindrical pressure section 22 that presses the pressure section 20 is provided. Note that 23 is a support portion that supports the processed portion 22 so as to be slidable in its axial direction. The guide plate 30 is a disc formed from an arbitrary member, and has a rotating shaft 21 that passes through the press plate 20 and projects toward the pressurizing surface of the spherical workpiece.
It is detachably and rotatably attached coaxially with the push plate 20 to the tip of the press plate 20. Therefore, this guide plate 3
0 is eccentric with respect to the grinding plate 10 similarly to the press plate 20 described above. The amount of eccentricity is greater than the radius of the guide plate 30. As shown in FIG. 4, this guide plate 30 has a plurality of through holes 31 arranged at regular intervals on a plurality of concentric circles centered on the part attached to the rotating shaft 21 (coinciding with the center of the disk). As shown in FIG. 5, the opening diameter of each through hole 31 on the side facing the lap plate 10 is smaller than the diameter of the spherical workpiece S, and the opening diameter on the opposite side is smaller than the diameter of the spherical workpiece S. It has a tapered hole shape larger than the diameter of S,
In addition, the side wall far from the center of the guide plate 30 is steeply sloped compared to the side wall near the center (α>β). Note that the number of circumferences on which the plurality of through holes 31 are formed is not plural;
It may be a single circumference.

To process the spherical workpiece S, first, the guide plate 30
A spherical workpiece S is placed on the through hole 31 and attached to the rotating shaft 21 of the press plate 20. Thereafter, the advance/retreat shaft 14 of the grinding plate 10 is advanced to bring the grinding surface of the grinding plate 10 into light contact with the spherical workpiece S, and the pressurizing section 22 is moved so that the presser plate 20 presses the spherical workpiece S. Add a constant load to S. When the grinding plate 10 and the pushing plate 20 are rotated in the direction shown by the arrow, the spherical workpiece S rotates, and thereby the guide plate 30 also rotates, and the spherical workpiece S on the guide plate 30 rotates. All grinding is done using the same mechanism as centerless grinding. That is, the spherical workpiece S is pressed against the grinding surface of the grinding plate 10 in the perpendicular direction by the pusher plate 20, and due to this pressure and rotation of the grinding plate 10 and the pusher plate 20, the spherical workpiece S is pressed parallel to the grinding surface. The guide plate 30 is rotated around the X axis, thereby rotating the guide plate 30. At the same time, due to the difference in contact points a and b with the guide plate 30 shown in FIG. 5, it also rotates around another axis different from the X-axis. By combining the rotations about these axes, all the spherical workpieces S are processed to gradually become a perfect sphere.

When processing spheres using this processing device, a large number of spheres can be processed at once, and in particular, since the grinding surface is formed by a grindstone, processing can be performed without supplying a lapping agent. In addition, the grinding plate is eccentric to the press plate, and the amount of eccentricity is greater than the radius of the press plate, so compared to conventional coaxial processing equipment,
It can process at least 20 times the efficiency, and in particular can process ceramic spheres, which are known as difficult-to-cut materials, in a short time.

[Brief explanation of drawings]

Figure 1 is a partially cutaway sectional view of a conventional sphere machining device, Figure 2 is a diagram showing changes in the groove shape of the grinding plate,
FIG. 3 is a partially cutaway cross-sectional view of an embodiment of the present invention, FIG. 4 is a plan view of a guide plate, and FIG. 5 is a cross-sectional view showing the shape of a through hole in the guide plate. 10: Grinding plate, 12: Grinding wheel, 13: Rotating plate, 2
0: Push plate, 21: Rotating shaft, 22: Pressure part, 30:
Guide plate, 31: Through hole.

Claims (1)

[Claims] 1. A push plate, a grinding plate that has a grindstone for grinding a spherical workpiece, is eccentrically opposed to the push plate, and is rotatably provided, and a first grinding plate that rotationally drives the grinding plate.
a drive device, and a disk-shaped guide installed coaxially and rotatably with respect to the press plate between the press plate and the grinding plate and having a plurality of through holes for rotatably supporting the workpiece. a plate, a second drive device that rotationally drives the guide plate, and a pressure device that presses the workpiece supported by the guide plate against the grindstone of the grinding plate via the press plate. The through holes of the guide plate are provided along a circumference coaxial with the pushing plate, and each of the through holes has an opening diameter on the grinding plate side that is smaller than an opening diameter on the pushing plate side. A sphere machining device characterized in that the grinding plate is formed in a tapered shape, and the eccentricity of the grinding plate is greater than or equal to the radius of the guide plate.