JPS5979143A - Measuring and detecting method of wear quantity of grindstone - Google Patents

Abstract

PURPOSE:To measure the wear quantity of a grindstone with high resolution and in simple constitution, by using a noncontact sensor utilizing high-frequency eddy current loss and utilizing the characteristic that the output voltage is changed in accordance with a relative distance when loading the sensor with constant voltage and current. CONSTITUTION:A pickup part 2 of the sensor which is attached to a grindstone 1 and a grindstone cover 3, which are attached to a grindstone shaft 8, through a back and forth moving wheel 7, a handle 4 for adjusting forward and backward movement, and an attaching arm 5 is arranged. The output corresponding to a distance G from the surface of the grindstone 1 to the pickup part 2 is outputted from the pickup part 2. If the relative distance G is changed to G' because of the wear of the grindstone, the output voltage is changed. Thus, the wear quantity of the grindstone is measured with high resolution and in simple constitution.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to polishing technology, particularly to a method for measuring and detecting the amount of wear on a polishing wheel.

Conventionally, there are two ways to measure the amount of wear on a polishing wheel: a method in which a contactor is placed on the surface of the wheel (contact measurement), and a method in which it is measured without contact (non-contact measurement). It is inefficient because the work must be interrupted and the grindstone stopped, and the discontinuous measurement delays the timing for determining the state of wear of the grindstone. Also, to improve this, a unit of 1 river is required, which results in a higher cost.

In the latter case, no specific measurement or detection method has yet been put into practical use. This is because the surface texture of Abrasive I is microscopically uneven and changes moment by moment due to the abrasive grains falling off at 1FnJ, so optical means (reflection type) cannot measure it with high precision. No other method has reached the level of practical use in terms of accuracy.

In addition to the above, instead of directly measuring the wear of the grinding wheel,
There is also an indirect method of estimating the amount of wear based on changes in the current of the grinding wheel shaft drive motor, but this method can measure clogging of the grinding wheel or reduction in sharpness by changes in the current value, but wear M
The disadvantage was that it could not be measured.

In the course of research on a grindstone wear meter measurement method, the present inventors discovered fτ1 frequency eddy current 10 using eddy current loss of high frequency current.
Non-contact C distance measurement is possible by using the Sen-o if the object is metallic, whether it is non-magnetic or magnetic.
Furthermore, in the case of a substance with a small amount of metal content in the grindstone, by applying a constant voltage and current to the sensor due to the metal content contained in the bonded weight (C) in the grindstone, it is possible to reach a distance of about 41 cm. They also discovered that the output voltage is proportional to the distance, and that it is possible to measure distances with an accuracy of ±0.01, which can be fully utilized for measuring and detecting the amount of wear.

Therefore, the present invention aims to directly measure the wear amount of a grinding wheel using a non-contact measurement method that allows continuous measurement of changes in the amount of wear, has high resolution (detection ability), and has a simple structure in terms of cost, installation, and workability. The purpose is to provide a measurement method.

For this purpose, Tiremon I containing metal in the binding material
: When measuring the amount of wear on grinding wheels and CBN grinding wheels, we use a non-contact sensor that utilizes high-frequency eddy currents, and when a constant voltage and current are applied to the sensor side, the output voltage changes in direct proportion to the relative distance of each other.゛C is achieved by a method of measuring and detecting the degree of wear of the grinding wheel using its characteristics.

The present invention will be described in detail below based on the accompanying drawings. 1 to 3 show one embodiment of the present invention. As shown in Fig. 1, the grinding wheel l attached to the grinding wheel shaft 8 and the grinding wheel cover 3 are 011 rear movement shaft 7, back and forth movement @ adjustment handle 4,
A pick-up section 2 of the sensor is mounted via a mounting arm 5. If the distance from the surface of the grindstone to the front surface of the pink °r knob at this time is G, then the distance F4
The output voltage corresponding to 11 is shown in Figure 4, which is connected to the pick-up section 2 (l'1 is output from the width gauge).The measurement method is as shown in Figure 3 from the initial relative distance G As a result, when the relative power changes to 141 G', there is a difference of 41'' in the respective output voltages by the amount of wear.The amount of wear of the grindstone can be read from the potential difference and correction can be made on the machine side.

As a means of informing the operator of these information, a monitor shown in FIG. 4, which is connected to the Biwak Asop, is provided, and display lamps 9 to 10 and a buzzer 12 are installed. In addition, there are digital settings that can be set according to the required accuracy.
C Sochi also belongs to A1 and makes the present invention practical.

In this case, it is necessary to place the big part 2 of the sensor in a position where the output voltage is directly proportional to the relative distance to the grinding wheel, so a longitudinal movement axis 7 and a longitudinal movement adjustment handle 4 are included to adjust the distance. The structure also includes a position adjustment mechanism.

Here, each limit position is displayed on the monitor using 1ζ display lamps 9 and 11, so that the operator can know it.

As is clear from the above, according to the present invention, changes in wear amount can be measured continuously using a non-contact measurement method, and the resolution (detection ability) is high (and the cost is low.) 2. Workability It has advantages such as a simple structure.

[Brief explanation of the drawing]

Figure 1 is a side view of the device used in the method of the present invention, Figure 2 is a front view of the device used in the method of the present invention, Figure 3 is an enlarged view of section A in Figure 1, and Figure 4 shows the front panel of the monitor. show. 1 ---- One grinding wheel 2 ---- High frequency eddy current loss sensor pickup section 3
------- Grindstone cover 4 --- Handle for adjusting forward and backward movement 5 --- Mounting arm, 7- Back and forth movement axis 8 -----
1 grinding wheel axis, 9-11-indication lamp + 2--buzzer, 13-----Digital Suisoji Applicant Tokota Automatic E? 4”72hishaj Figure 1 also Figure 3 Figure 2 Figure 4

Claims (1)

[Claims] Diamond whetstones and CBN containing metal in the binding material
To measure the amount of wear on a grinding wheel, we use a non-contact sensor that utilizes high-frequency eddy current loss, and we have developed a characteristic in which when a constant voltage and current are applied to the sensor, the output voltage changes in direct proportion to the relative distance between them. Measurement of the amount of wear on the grinding wheel used
Detection method.