JPS62136371A - Grinding fluid feed device for grinding machine - Google Patents

Abstract

PURPOSE:To ensure the proper feed of a grinding fluid from nozzle to grinding point by providing a controller for controlling a nozzle drive mechanism depending upon a rotary angle in the relative rotary shift of a grindstone for a workpiece. CONSTITUTION:With a grindstone 'T' rotating on a spindle 13, a workpiece 'W' is turned monolithically with a table 11 about the rotary center 'l' of said spindle 13 and the internal surface of the workpiece 'W' is gradually made to come in contact with the external surface of the grindstone 'T' for grinding. In this grinding process, when the grindstone 'T' has turned by a relative angle theta from a phantom base line 'G' for the workpiece 'W', a controller 18 and a drive mechanism 17 work to turn a nozzle 16 in the same direction and by the same angle. If the nozzle 16 is initially so set as to correspond to a grinding point 'P', therefore, the nozzle 16 can always opposite the grinding point 'P', in a grinding process, thereby enabling the proper feed of a grinding fluid to the grinding point 'P'.

Description

[Detailed description of the invention]

"Industrial Application Field" The present invention relates to a grinding fluid supply device for a grinding machine. ``Prior Art'' Conventionally, a machining center or an NC vertical milling machine has been used to perform deep-cut grinding on high-hardness materials such as cemented carbide or ceramics. The figure shows an example of this. In the figure, reference numeral W indicates a workpiece made of a high hardness material fixed to a table (not shown), and this workpiece W is configured to be moved from side to side behind the surface integrally with the table. In addition, a ring 3 is fixed to the outer periphery of a support cylinder 2 that rotatably supports the main spindle 1, and the tip of this ring 3 is attached to the grindstone T. The grinding fluid supply nozzle 4 extends to the outer periphery of 'r' or in the circumferential direction 9.
A total of 4 pieces are installed at 0 degree intervals. In the above processing device, the grindstone T is rotated on its own axis while the workpiece L is rotated around the rotation center Q of the grindstone T, so that the grindstone T is attached to the inner surface of the ring-shaped workpiece W. The workpiece W is ground by relatively rotationally moving the workpiece W. Furthermore, in the processing apparatus described above, grinding fluid is constantly supplied toward the grindstone T from the nozzle 4 during the grinding process. "Problems to be Solved by the Invention" By the way, in the above-mentioned grinding fluid supply device, the relative position of the grinding wheel T and the workpiece W is such that the - nozzle 4 is located as shown by the solid line in FIG. If the position corresponds to the grinding point P (the point where the grindstone T contacts the workpiece W and is actually ground), although sufficient grinding fluid can be supplied to the grinding point P, the When the grindstone T rotates relative to the workpiece W and none of the nozzles 4 correspond to the grinding point P, as shown by the two-dot chain line in the figure, the grinding fluid is sufficiently supplied to the grinding point P. become unable to do so. If a sufficient amount of grinding fluid cannot be supplied to the grinding point P in this way, seizure or abnormal wear may occur on the surface of the grinding wheel T, and especially if the workpiece W is made of cemented carbide or In the case of brittle materials such as ceramics,
A problem occurs in that the workpiece W is more likely to be cracked or damaged. Conventionally, in order to avoid the above-mentioned problems, measures such as lowering the grinding speed, increasing the frequency of dressing, and replacing the grinding wheel T early have been taken, which has led to improvements in efficiency and tool costs. The reality is that this also leads to higher costs. The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to reliably supply grinding fluid to the grinding point, thereby quickly solving the above-mentioned problems. [Means for Solving the Problems] In order to achieve the above object, the present invention installs a grinding fluid supply nozzle on the outer periphery of a support tube that supports the main shaft so as to be rotatable around the support tube, and rotates the nozzle. A drive mechanism for driving the drive mechanism is provided, and the drive mechanism is further controlled for controlling the drive mechanism according to the rotation angle at that time when the grindstone rotates relative to the workpiece about the fixed center line. The structure is such that a container is provided. "Action" When the grindstone moves and rotates relative to the table,
Although the grinding point moves every moment, the grinding fluid supply nozzle can be rotated in accordance with the movement of the grinding point so that the nozzle always corresponds to the grinding point. As a result,
Grinding fluid can be reliably supplied to the grinding point at all times during machining. "Embodiment" An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram of main parts showing a state in which a grinding fluid supply device according to the present invention is assembled into a processing machine such as a machining center or an NC vertical milling lathe. In the figure, reference numeral 11 indicates a table, and this table is configured to be able to move freely left and right and back and forth with respect to a processing machine base (not shown), and is mounted on its upper part via a jig 12. The workpiece W can be fixed. Further, reference numeral 13 indicates a main shaft, and a grindstone T is attached to the tip of this main shaft 13. Further, a nozzle support ring 15 is rotatably attached to the outer periphery of the support cylinder 14 that supports the main shaft 13, and a grinding fluid supply nozzle 16 is attached to this ring I5 so that its tip extends to the vicinity of the outer periphery of the grindstone T.
Only one is attached. A drive mechanism 17 such as a pulse motor is connected to the nozzle support ring I6 via a power transmission mechanism (not shown),
This drive mechanism 17 is controlled by a controller 18. The controller 18 controls the drive mechanism 17 according to the relative rotation angle between the grindstone T and the workpiece W. Specifically, as shown in FIG. On the other hand, when the relative phase angle θ is rotated from the virtual reference aG, the nozzle support ring 16 is rotated in the same direction by the same angle θ.
It controls the drive mechanism I7. therefore,
In the case of a machine such as a machining center, an NC milling machine, etc., in which the table 11 and the workpiece W integrated therewith are moved by a pre-installed program, the drive mechanism 17 is controlled based on a signal for moving the table 2, etc. In addition, a sensor may be provided to detect the relative rotation angle between the grindstone T and the workpiece W, and the drive mechanism 17 may be driven based on the detection signal from this sensor. It may be possible to generate a single signal. Next, a case in which the workpiece W is ground by the above processing machine will be described. The grindstone T is rotated on its own axis by the main shaft 13. In addition, in parallel with the rotation of the grindstone T, the workpiece W is rotated together with the table 11 around the rotation center σ of the grindstone T, and the inner surface of the workpiece W is rotated around the rotation center σ of the grindstone T. It is ground by gradually coming into contact with the outer periphery. During the above grinding, as shown in FIG. 2, when the grinding wheel T rotates by an angle θ relative to the virtual reference line G with respect to the workpiece W, the controller 18 and the drive mechanism 17 rotate the ring 16 in the same direction at the same angle θ. It is rotated and turned. Therefore, if the nozzle 16 is initially set to correspond to the grinding point P, the nozzle 16 will be
can be always opposed to the grinding point P, so that the grinding fluid can be reliably supplied from the nozzle I6 to the grinding point P. In this way, since grinding fluid can be constantly and reliably supplied to the grinding point, there is no burning or clogging of the grinding wheel T surface, which in turn allows the grinding feed rate to be set faster, improving efficiency. This is an advantage. Below, the grinding conditions in the actual experiment will be described.

[Grinding conditions]

Workpiece: Grindstone using cemented carbide rolls...
...Diamond #140-170 cut...
...1-1.5mm feed ...2.
5-3mm/min Grinding wheel rotation speed...1800r
pm or more Grinding speed...6.6m/sec Grinding power...5KW or more Uraffi ・= -= ioo 12/min
Machining method: Up-cut On the other hand, when grinding is performed using the grinding fluid supply device shown in Figures 3 to 5 above and using the same conditions for the workpiece, grindstone, etc. as above, , cut...OJ~
0, 5mm feed =...-1~1.5mm/
Min cutting speed: 3 to 4 m/sec. As described above, when the grinding fluid supply device according to the present invention is used, the grinding speed etc. can be significantly increased compared to the case where the conventional device is used. In the explanation of the embodiment shown in FIGS. 1 and 2 above, the case where the workpiece W is ring-shaped and the inner surface thereof is processed is taken as an example. However, the workpiece is limited to a ring-shape. It may be of other shapes without being
The location to be ground is not limited to the inner surface, but may be, for example, the outer surface. ``Effects of the Invention'' As explained above, according to the present invention, a grinding fluid supply nozzle is rotatably attached to the outer periphery of a support tube that supports the main shaft, and a drive mechanism that rotationally drives the nozzle is provided. furthermore, the drive mechanism is configured such that the grindstone is directed against the workpiece;
Since the configuration includes a controller that controls the drive mechanism according to the rotation angle at the time of relative rotational movement around the fixed center line, the grinding fluid can be reliably supplied to the grinding point, There is no seizure or abnormal wear on the surface of the grindstone, and there is no slippage, and as a result, the grinding feed speed can be increased, improving efficiency. In addition, especially when the workpiece is made of brittle materials such as cemented carbide or ceramics, the occurrence of cracks and defects that were previously seen are completely eliminated, and a significant improvement effect can be obtained from this point as well.

[Brief explanation of drawings]

1 and 2 show one embodiment of the present invention, in which FIG. 1 is a vertical cross-sectional view of the main part, FIG. 2 is a cross-sectional view along the - shore line in FIG. The figures show a conventional example, in which FIG. 3 is a perspective view, FIG. 4 is a longitudinal sectional view, and FIG. 5 is a sectional view taken along the line -V in FIG. 4. 11... Table, I3... Main shaft, 15... Nozzle support ring, 16... Grinding fluid supply nozzle, 17... Drive mechanism, 18 ... Controller, 'r ... Grindstone, W ... Workpiece.

Claims (1)

[Claims] A grindstone is attached to the tip of the spindle, while a workpiece is fixed to a table, and the grindstone rotates around the fixed center line of the workpiece fixed to the table. In a grinding machine that processes a workpiece by rotating relative to the workpiece, a grinding fluid supply nozzle is attached to the outer periphery of a support cylinder that supports the main shaft so as to be rotatable around the support cylinder. , a drive mechanism for rotationally driving the nozzle is provided, and the drive mechanism is configured to drive the drive mechanism according to the rotation angle at that time when the grindstone rotates relative to the workpiece about the fixed center line. A grinding fluid supply device for a grinding machine, characterized by being provided with a controller for controlling a mechanism.