JPH0543461B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a forming grinder, and particularly to a forming grinder equipped with a grinding wheel suitable for high-precision forming grinding.

[Background of the invention]

A conventional forming grinder using a metal bonded grindstone is used by attaching the grindstone to a rotating jig on an electrical discharge machine, shaping the shape by electrical discharge machining, and then attaching it to the grinding machine. In such conventional grinding machines, errors may occur in the attachment of the grindstone. In order to remove this error, it is necessary to perform dressing using a dressing board, a rotary dresser, etc., which has the drawback of requiring a large amount of time.

Note that patents related to this type of grinding wheel for grinding machines include, for example, JP-A-51-43289 and JP-A-Sho 51-43289;
No. 51-84686, Japanese Patent Laid-Open No. 51-47688, etc., but all of them are methods for modifying the shape of a grinding wheel, and there is no method for modifying the shape of a grinding wheel on a grinding machine.

[Purpose of the invention]

SUMMARY OF THE INVENTION The present invention aims to improve the conventional grinding machine as described above, and provides a forming grinder that can easily form a grindstone and perform forming grinding with high precision.

[Summary of the invention]

In order to achieve the above object, the present invention provides a device for correcting the side runout of a grinding wheel on a grinding machine (including the shape of the outer peripheral tip) by electric discharge machining, and includes a discharge state detection mechanism and a discharge pole moving mechanism. In addition, a means for controlling the movement of the grindstone shaft is provided, a valve is provided in the nozzle that supplies machining fluid to the machining section during electrical discharge machining and grinding, and a control circuit for the grindstone shaft motor is incorporated in the valve, and according to each machining, The valve is switched to switch the machining fluid and the rotational speed of the grindstone.

[Embodiments of the invention]

Next, one embodiment of the present invention will be explained with reference to FIGS. 1 and 2.

FIG. 1 is a perspective view showing a schematic configuration of a grinding machine to which the present invention is applied, and FIG. 2 is a block diagram of a control circuit used in the grinding machine shown in FIG.

In FIGS. 1 and 2, the forming grinder of the present invention includes a grinder body 8 and a drive motor (not shown) mounted on the grinder body 8 to be rotated by the grinder body 8. The grinding wheel spindle 3 and
A disc-shaped grinding wheel 1 made of a thin plate is attached to the grinding wheel shaft 3, a table 9 is provided on the grinding machine body 8 so as to be movable in the direction perpendicular to the grinding wheel shaft 3 (in the X direction), and Insulating plates 12 on both sides of the grindstone 1
A discharge electrode plate 6 is detachably disposed through the grinding wheel shaft 3 and performs correction shaping including correction of lateral runout of the grinding wheel 1 mounted on the grinding wheel shaft 3, and a voltage is applied between the discharge electrode plate 6 and the grinding wheel 1. A power source 7 for electric discharge machining to be applied, and a detector 1 that detects the voltage between the electric discharge plate 6 and the grinding wheel 1.
8, and an electric discharge machining control device 10 that controls the movement of the table 9 according to the voltage detected by the detector 18.
b, and supplying machining fluids suitable for each of the discharge molding of the grindstone 1 and the grinding process by the grindstone 1,
It is configured to include a valve 15 for switching the rotation speed of the grindstone shaft 3.

In the above configuration, the grindstone 1 is attached via the flange 2 to the grindstone shaft 3 rotated by the drive motor and rotates in the direction of the arrow, and the grindstone 1 can be moved in the direction of the arrow Y by the forming and grinding control device 10a. It is equipped with movement control means. In addition, safety covers 11a and 1 are provided on the grinding wheel 1 and the grinding wheel shaft 3, respectively.
1b is provided.

On the table 9 facing the grinding wheel 1, a grinding wheel 1 is mounted.
Electric discharge electrodes 6, 6 are provided at appropriate intervals on both sides of the grinding wheel 1, and a necessary voltage is applied between the electric discharge electrodes 6, 6 and the grinding wheel 1 from a power source 7 for electric discharge machining to perform electric discharge machining. By detecting the discharge electrode plate between the discharge electrode plate 6 and the grindstone 1 with the discharge state detector 18, the machining state is detected and controlled. During electrical discharge machining of the grindstone 1, the rotation speed of the grindstone 1 is set to several hundred revolutions per minute, and the pump 16 for electrical discharge machining shown in FIG.
5 is switched to electric discharge machining, and the machining fluid is supplied from the machining fluid supply nozzle 4. The machining state can be detected by the discharge state detector 18, and the table 9 is moved by the arrow X by the discharge machining control device 10b.
Make it possible to control movement in the direction.

In this manner, the side surface and tip of the grinding wheel 1 are formed by performing electrical discharge machining under the conditions of electrical discharge machining: peak current of 3 A, pulse width of 17 μs, voltage of 80 V, and white kerosene as machining fluid.

After processing the tip and side surface of the grinding wheel 1 in this manner, the discharge electrodes 6, 6 and the insulating plate 12 are removed from the table 9, the sample to be ground is mounted on the table 9, and the processing fluid supply pump 16 and switching valve are removed. At the same time, the grinding liquid supply pump 17 is switched to perform the grinding process. A grindstone shaft motor control circuit 14 is incorporated into the valve 15 so that when the grinding liquid supply pump 17 is switched to the grinding liquid supply pump 17 during this grinding process, the circumferential speed of the grindstone 1 becomes approximately 2000 m/min. Further, while the grinding state of the grindstone 1 is detected by the grinding state detector 13, the table 9 is controlled to move in the direction of the arrow X by the forming grinding control device 10a to perform processing. According to the inventor's experiment using the grinding machine, as a result of machining under the above-mentioned electrical discharge machining conditions, the side surface of the grinding wheel was formed to have a thickness of 0.3 mm, an outer diameter of the grinding wheel of 58 mm, and a protruding length of the grinding wheel of 4.5 mm. was completed. This shaped whetstone has a grindstone side runout of ±1 μm, which is significantly improved compared to the conventional 20-30 μm. Cutting was performed using this shaped grindstone using a water-soluble grinding fluid, and as a result, results with good processing accuracy were obtained.

〔Effect of the invention〕

As described above, in the forming grinder of the present invention, the grindstone placed on the grinder can be formed by electrical discharge machining on the table, so there is no need to attach the grindstone, which results in installation errors. It is possible to form a high-precision grindstone without any fear, and since grinding can be performed by simply removing the electrical discharge machining device and switching the machining fluid switching valve, there is an effect that high-precision molding and grinding can be performed.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a schematic configuration of a grinding machine to which the present invention is applied, and FIG. 2 is a block diagram of a control circuit used in the grinding machine shown in FIG. 1...Whetstone, 2...Flange, 3...Whetstone shaft,
4... Machining fluid supply nozzle, 6... Discharge electrode, 7...
...Electric discharge machining power source, 8... Grinding machine body, 9... Table, 10a... Forming and grinding control device, 10b...
... electrical discharge machining control device, 12 ... insulating plate, 13 ...
Machining state detector, 14... Grinding wheel axis control circuit, 15
... Machining fluid switching valve, 16... Electric discharge machining fluid supply pump, 17... Grinding fluid supply pump, 18...
Discharge state detector.

Claims (1)

[Claims] 1 A forming grinder body, a grindstone shaft rotatably provided on the form grinder main body, a disc-shaped grindstone attached to the grindstone spindle, and a table top movable in a direction perpendicular to the grindstone axis. A discharge electrode plate is removably disposed on both sides of the grindstone with an insulator interposed therebetween, and performs correction shaping including correction of side runout of the grindstone mounted on the grindstone shaft; a power source for electrical discharge machining that applies voltage between grinding wheels; a detector that detects voltage between the electrical discharge electrode plate and the grinding wheel; and movement control of the table in accordance with the voltage detected by the detector. A forming grinding machine comprising: an electric discharge machining control device for controlling the grinding wheel; and a valve for supplying machining fluid suitable for each of the electric discharge forming of the grinding wheel and the grinding process using the grinding wheel, and switching the rotation speed of the grinding wheel shaft. .