JPH01321164A - Grinding equipment - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a grinding device for surface grinding hard and brittle materials such as ferrite and ceramics.

BACKGROUND OF THE INVENTION In recent years, grinding machines are required to have high reliability due to 24-hour operation in production processes.

An example of the conventional grinding apparatus mentioned above will be described below with reference to the drawings. FIG. 4 shows a main configuration diagram of a conventional grinding device.

In FIG. 4, 1 is a grindstone for grinding, 2 is a tool spindle that rotates the grindstone, 2o is a workpiece, 21 is a jig for holding the workpiece, and 22 is a tool for attaching the workpiece.
23 is a table on which the work spindle is placed and can slide in the direction of arrow X; 24 is a ball screw that linearly drives the table; 26 is a ball screw that rotationally drives the ball screw. motor,
26 is a grinding fluid supply nozzle.

The operation of the grinding device configured as described above will be described below. First, as a pre-processing step,
The tool spindle 2 is rotated to rotate the grindstone 1. At the same time, the workpiece spindle 22 is rotated to rotate the workpiece sticking jig 21 and the workpiece 2o, and the grinding liquid is injected through the grinding liquid supply nozzle 26.

Next, when the motor 26 is rotated and the ball screw 24 is driven to move the table 23 in the direction of the arrow X, the grindstone and the workpiece come into contact and a grinding process begins. When the table has been moved to a predetermined setting value, the machining process is completed and the table is returned to its original position, completing the machining.

Problems to be Solved by the Invention However, with the above configuration, there is no function to inspect the grinding wheel for damage immediately before starting the machining process, so the workpiece enters the grinding process with a damaged whetstone and becomes a defective product. It had some problems.

In view of the above problems, the present invention provides a grinding device that automatically detects damage to the grindstone that may occur during machine operation, stops the next process, and prevents the production of defective products. It is something to do.

Means for Solving the Problems In order to solve the above problems, the grinding device of the present invention has the following features:
It is equipped with a nozzle that ejects and sprays liquid such as grinding water from near the grinding area, and the reaction force generated in this area causes distortion in a part of the cantilever held. This phenomenon is detected by a detector such as a strain gauge, and if this signal exceeds a certain limit, a stop signal is output to the control device.

According to the present invention, with the above-described configuration, if the grindstone is damaged, signals can be detected at the same angle when the grindstone shaft is rotated, so automatic recognition is possible according to this principle.

EXAMPLE Hereinafter, a grinding apparatus according to an example of the present invention will be described with reference to the drawings.

FIG. 1 shows a grindstone shaft portion of a grinding device according to an embodiment of the present invention. In FIG. 1, 1 is a grindstone for grinding, 2 is a tool spindle that rotates the grindstone, and 3 is a nozzle that sprays liquid onto the grindstone. 4 is a supply pipe that supplies liquid to the nozzle, 5 is a cantilever that holds the nozzle and generates strain by the reaction force generated by the nozzle, and 6 is a sensor such as a strain gauge that converts the strain generated by the cantilever into an electrical signal. be. 7 is a base bracket that holds the cantilever and is rotatable; 8
is an actuator such as a motor that rotates the base bracket. In FIG. 2, 9 is an amplifier that amplifies the output signal of the sensor, 10 is a limit detection device, and 11
is the control device.

The operation of the grinding apparatus configured as described above will be described below with reference to FIGS. 1 and 2. First of all
The figure shows the grinding wheel shaft part of the grinding device,
Before starting the machining process, the grindstone 1 is rotated at low speed by the tool spindle 2.

Then, the actuator 8 is driven and the base bracket 7 is
The nozzle 3, which is attached and held by the cantilever 6, is moved to the front of the grindstone, and liquid is supplied from the supply pipe 4 and ejected from the nozzle. Since the gap between the nozzle and the grindstone is set to be very small, a -like fluid film is formed between the nozzle and the grindstone. Therefore, the nozzle moves in a manner that follows the unevenness of the surface of the grinding wheel, and a corresponding strain is generated in the cantilever. The sensor 6 converts the strain into an electrical signal. In Figure 2, amplifier 9
amplifies the electrical signal output from the sensor attached to the cantilever and transmits it to the limit detection device 10. Here, the quality of the grindstone is determined, and if there is a defect, the control device 11
outputs a stop signal to stop further machining and prompt the operator to replace the grindstone.

As described above, according to this embodiment, a nozzle is provided near the grindstone, a liquid is ejected from the nozzle, and the grindstone is rotated while maintaining a constant gap from the surface of the grindstone.

By providing a cantilever and a sensor to detect the displacement of this nozzle, if the grinding wheel is damaged, the waveform of the signal obtained by amplifying the sensor signal with an amplifier is as shown in Figure 3 (a).
), which is different from the waveform for a normal grindstone shown in FIG. 3 (1)). This change is detected by a limit detection device, and if an abnormal state occurs, it becomes possible to stop the operation of the machine.

Effects of the Invention As described above, the present invention provides a grindstone damage detection device that is characterized by providing a nozzle near the grindstone and causing the nozzle to eject liquid toward the grindstone, so that when the grindstone is damaged, It becomes possible to stop machining.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the main parts of a grinding device according to an embodiment of the present invention, Fig. 2 is a system diagram of control signals, and Fig. 3 (,), (
b) is a waveform diagram of a displacement signal, and FIG. 4 is a plan view of a main part of a conventional grinding device. 1... Grindstone, 2... Tool spindle, 3... Nozzle, 5... Cantilever, 6... Sensor, 9... ...Amplifier, 1
o... Limit detection device, 2°... Work, 22... Work spindle. Name of agent: Patent attorney Toshio Nakao and 1 other person1-
Shichiji stone G=-τshi length-

Claims (1)

[Claims] A nozzle that ejects liquid from near the grinding wheel, a cantilever that deflects due to the reaction force generated by the nozzle, an amplifier that detects the deflection generated by the cantilever and amplifies the signal, and if there is an abnormality in the output signal of the amplifier. , a limit detection device that recognizes this and outputs a stop signal, and a control device that can stop the operation of the machine in response to the stop signal.