JPH0234750B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a grinding fluid supply device for an automatic grinding machine that grinds the peripheral surface of a workpiece such as large-diameter glass, crystal, or ceramics.

[Conventional technology]

There are various types of grinding machines depending on how the relative movement between the grinding wheel and the workpiece is performed. When grinding into a shape, the workpiece 2 is usually placed on a table 1 that is moved by numerical control in two orthogonal directions on the same plane, that is, the X-axis and Y-axis directions, as shown in FIG. A grinding wheel 4 installed at the lower end of a rotating main shaft 3 that can move up and down and is rotated by a drive motor (not shown) is attached to the circumferential surface 5 of the workpiece 2.
There is known a device in which the peripheral surface 5 is ground by being brought into pressure contact with the surface 5 and being sequentially moved by the movement of the table 1. When grinding, as with general cutting machines, it is necessary to constantly supply grinding fluid to the interface between the workpiece and the grinding wheel. Therefore, a pipe 6 is placed near the grinding wheel 4, and a certain amount or more of grinding fluid is supplied from the pipe 6. Grinding fluid (polishing fluid) is constantly supplied to the grinding location. Particularly in the case of brittle materials such as glass and ceramics, the supply of grinding fluid is considered to be an important issue because lack of grinding fluid causes damage to the workpiece due to the heat generated on the machined surface.

[Problem that the invention seeks to solve]

By the way, in such a conventional automatic grinding machine, when the workpiece 2 moves, the grinding wheel 4 moves the workpiece 2
Since the contact area with the grinding wheel, in other words, the grinding area, changes, the pipe 6 cannot be fixed to the grinding wheel 4, and the operator must adjust the position and direction of the pipe 6 each time so that it points toward the grinding area. are doing. However, since the operator must constantly monitor the position and direction of the pipe 6 by manual operation, he or she cannot leave the position. It is extremely troublesome because the position and direction must be corrected from time to time. In particular, when grinding the circumferential surface of the same workpiece several times by changing the amount of grinding, the equipment must be attached to the machine for each time, and correcting the position and direction of the pipe 6 is a simple task. As a result, there was a problem in that the operator became bored and lost his/her attention, resulting in delays in correcting the position and direction.

Therefore, as a means to solve this problem, the table 1 is immersed in a grinding liquid tank, and the pipe 6 is
There are also known grinding machines that eliminate the use of grinding fluid, but these machines require a grinding fluid tank, making the equipment itself large-scale and making it impossible to observe the grinding location on the workpiece. Further, there were other inconveniences such as the work of attaching and detaching the workpiece 2 to the table 1 was troublesome.

[Means for solving problems]

The grinding fluid supply device for an automatic grinding machine according to the present invention has been made in order to solve the above-mentioned problems, and is capable of freely rotating a storage tank to which the grinding fluid is supplied around the main shaft of the grindstone. placed in
A supply pipe having a nozzle and a guide roller are disposed in the storage tank, and a constant rotational force is applied to the storage tank by an urging means to press the guide roller against the circumferential surface of the workpiece, The nozzle is always directed to the grinding location of the workpiece.

[Effect]

In the present invention, by applying a constant rotational force to the storage tank using the biasing means, even if the curvature or direction of the circumferential surface of the workpiece changes, the position and direction of the nozzle automatically change accordingly. Since the grinding point is always oriented, the grinding fluid can be reliably supplied to the grinding point, eliminating the need for operator monitoring and position/direction correction.

〔Example〕

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

Fig. 1 is a sectional view of the head of an automatic grinding machine equipped with a grinding fluid supply device according to the present invention, Fig. 2 is a front view of the head, and Fig. 3 shows the grindstone, guide roller, nozzle, and workpiece. It is a top view showing the relative positional relationship of. Components in the figure that are the same as those in FIG. 4 are designated by the same reference numerals. In these figures, above a table 1 that moves in the X-axis and Y-axis directions is a rotating main shaft 3 that is movable and adjustable in the vertical direction, and a diamond grindstone 4 as a grinding wheel is attached to the lower end.The upper end of the rotating main shaft 3 is a drive motor 10. , and is configured to be rotated at high speed when grinding the circumferential surface of the workpiece 2. The diamond grindstone 4 is fixed to the lower end of the rotating main shaft 3 by a nut 11, and is replaced with one having a different grain size depending on the material of the workpiece 2, the amount of grinding per time, etc.

A cylindrical storage tank holding member 12 is disposed on the lower surface of the drive motor 10 with a cylinder body 13 interposed therebetween. A storage tank 14 is rotatably disposed via a thrust bearing 15 and a seal member 16. A grinding fluid 19 such as a water-soluble grinding fluid (for example, Jeonson Wax LE220 (trade name)) is supplied into the storage tank 14 from a pipe 17 through a passage 18 provided inside the storage tank holding member 12. A gear 20, a support shaft 21 and a supply pipe 22 that extend downward are disposed on the outer periphery, and a biasing means 30 (described later) is provided at the lower end of the support shaft 21.
A rotatable guide roller 24 made of tetrafluoroethylene or the like is pressed against the circumferential surface 5 of the workpiece 2 by
The upper end of the supply pipe 22 communicates with the inside of the storage tank 14, and the lower end is attached with a nozzle 25 having a plurality of small holes 26 on the circumferential surface. The nozzle 25 is adjustable in height and angle and is located between the diamond grinding wheel 4 and the guide roller 24, and the small holes 26 are provided in a single vertical row (or in multiple rows if necessary), and the direction thereof is the same as that of the guide roller. 24 is pressed against the circumferential surface 5 of the workpiece 2, so that it always points toward the contact point between the grindstone 4 and the workpiece 2, that is, near the grinding point P. Although the grinding point P moves back and forth somewhat depending on the shape and curvature of the circumferential surface 5, it is set near the point of contact between the guide roller 24 and the grindstone 4 on a tangent L that touches the circumferential surface of the grindstone 4.

The urging means 30 applies a constant rotational force to the storage tank 14 in the same direction as the grindstone 4, and is fixed to the device fixing part or the outer periphery of the drive motor 10 via a bracket (not shown). drive motor 31 and output shaft 31 of this motor 31
It is composed of a torque limiter 32 attached to A, an intermediate gear 34 that meshes with a gear 33 provided on this torque limiter 32, and the gear 20 that meshes with this intermediate gear 34, and the rotation of the drive motor 31 is caused by the rotation of the drive motor 31 through the gear 20. Torque limiter 32, gear 3
3 and the intermediate gear 34, a rotational force is applied to the storage tank 14 in the clockwise direction in FIG. It is always in pressure contact.

Note that the urging means 30 is not shown in FIG. 1. Further, 35 is a lid fixed to the lower surface of the storage tank holding member 12.

Although the grinding supply nozzle 25 and the guide roller 24 are placed on the right side of the grinding wheel 4 in FIGS. When the grinding wheel 4 rotates clockwise as shown in FIG. 3, it is disposed at the position shown in FIG.

In an automatic grinding machine with such a configuration,
To explain the operating procedure, first, a grinding wheel such as a diamond grindstone 4 having a predetermined selected grain size is set at the lower end of the rotating main shaft 3. At this time, depending on the height or wall thickness of the workpiece 2, the rotating main shaft may be replaced with a rotating main shaft having a length suitable for the required stroke. Next, the workpiece 2 is mounted and fixed on the table 1, and its center O (FIG. 4) is determined. Rotating main shaft 3
and align it with the center O. The NC control device controls the center position, grinding amount, table movement speed, movement distance (X, Y axis), start and end timing of supply of grinding fluid 19, processing start and end timing, curvature of the circumferential surface of the workpiece 2, etc. Set various information.

After setting the program, when the start button is pressed, the rotating main shaft 3 moves from the center O of the workpiece 2 to the grinding start point of the circumferential surface 5 and descends, and the drive motor 1
0, the rotating main shaft 3 rotates and the diamond grindstone 4 starts grinding the circumferential surface 5. at the same time,
The table 1 also has an X axis, according to the shape of the workpiece 2.
Moving in the Y-axis direction, the outer periphery of the workpiece 2 is ground, and the workpiece 2 rotates once around the diamond grindstone 4 with its peripheral surface in contact with the grindstone 4. Moreover, when grinding is started, the drive motor 31
is driven, and its rotational force is transmitted to the gear 20 via the torque limiter 32, gear 33, and intermediate gear 34, thereby rotating the storage tank 14 clockwise in FIG. Press at a specified pressure. This contact pressure is adjusted to an appropriate value by a torque limiter 32. Furthermore, pipe 17
The grinding fluid 19 is supplied to the storage tank 14, guided through the supply pipe 22 to the nozzle 25, and sprayed from the small hole 26 toward the vicinity of the grinding point P of the workpiece 2.

Here, the rotation angle of the storage tank 14 varies depending on the shape and curvature of the circumferential surface 5, but the rotation angle of the guide roller 24
is always in pressure contact with the circumferential surface of the workpiece 2 and never separates, so the small hole 26 of the nozzle 25 always points near the grinding point P, and a certain amount of grinding fluid 19
is stably and reliably supplied to the grinding point P. Therefore, the grinding fluid 19 can be supplied automatically, and there is no need for operator monitoring or correction of the position and direction of the nozzle 25, which can significantly reduce the burden on the operator. Moreover, the less manual correction of position and direction is required, the safer it is.

Note that when the workpiece 2 goes around the grindstone 4 once and the first grinding is completed, the rotating main shaft 3 is returned to the original starting position, that is, the center O position of the workpiece 2. If the second grinding is to be performed subsequently, the same grinding as described above may be performed again with a different amount of grinding.

Although the above embodiment uses the drive motor 31, torque limiter 32, and gears 20, 33, and 34 as the biasing means 30 for applying a constant rotational force to the storage tank, the present invention is not limited to this in any way. A space may be provided between the storage tank holding member 12 and the storage tank 14, and a spiral spring as a biasing means for applying rotational force to the storage tank 14 may be housed in this space. If further polishing is to be performed after the grinding process is completed, the grindstone 4 may be replaced with a jig with a polishing polyurethane sheet stretched on its surface, and a cerium oxide suspension for polishing may be used instead of the grinding fluid.

〔Effect of the invention〕

As explained above, the grinding fluid supply device for an automatic grinding machine according to the present invention includes a storage tank provided with a guide roller and a nozzle that is rotatably disposed around the rotating main shaft, and the storage tank is maintained at a constant level by a biasing means. The guide roller is pressed against the circumferential surface of the workpiece by applying a rotational force of Eliminates the need for monitoring and direction correction,
Significant improvements in workability can be achieved. In addition, the structure is simple, there is no need to immerse the table in a grinding liquid tank, and workpieces can be easily attached and removed. Furthermore, there is no problem in supplying the grinding fluid even if the storage tank rotates 360 degrees around the rotating spindle, and since the grinding fluid is evenly supplied to the grinding area, the wear in the thickness direction of the grinding wheel is uniform. , it becomes possible to accurately control the amount of grinding of the workpiece.

[Brief explanation of drawings]

Fig. 1 is a sectional view of the head of an automatic grinding machine equipped with a grinding fluid supply device according to the present invention, Fig. 2 is a front view of the head, and Fig. 3 shows the grindstone, guide roller, nozzle, and workpiece. FIG. 4 is a plan view showing the relative positional relationship between the two, and FIG. 4 is a diagram for explaining the supply of grinding fluid by a conventional automatic grinding machine. DESCRIPTION OF SYMBOLS 1... Table, 2... Workpiece, 3... Rotating shaft, 4... Grindstone, 5... Surrounding surface, 10... Drive motor, 14... Storage tank, 19... Grinding fluid, 21... Support Shaft, 22... Supply pipe, 24... Roller, 25...
Nozzle, 26...Small hole, 30...Biasing means, 31
... Drive motor, 32 ... Torque limiter.

Claims (1)

[Claims] 1. In an automatic grinding machine that grinds the peripheral surface of a workpiece that is moved in two orthogonal directions in a plane using a grindstone attached to a rotating main shaft rotated by a drive motor, the grinding wheel is the same as the rotating main shaft. A storage tank having a rotational center shaft, rotatably arranged around the rotational main shaft and supplied with grinding fluid, a guide roller arranged in the storage tank via a support, and a supply pipe having a nozzle at the lower end. , comprising a biasing means that presses the guide roller against the circumferential surface of the workpiece by applying a constant rotational force to the storage tank, and directs the nozzle to the grinding location of the workpiece. Grinding fluid supply device.