JPH0328733A - Detector for balancing state and wearing state of grindstone - Google Patents

Abstract

PURPOSE:To discriminate between the grinding time and the non-grinding time automatically by providing a sound collecting means which detects a grinding sound when the graindstone of a grinding machine grinds a work. CONSTITUTION:An acoustic emission sensor 7 is disposed on the main shaft head of the grinding machine. The grinding sound detected by the sensor 7 converted into an electric sound wave signal, which is amplified 13. A BPF 14 extracts the sound wave signal of specific frequency from the sound wave signal and inputs it to a rectifying circuit 15. The rectified sound wave signal is inputted to a comparator 16. The comparator compares the voltage value of the sound wave signal with a previously set reference voltage value to output the detection code signal of 0 (1) to a CPU 11 when the reference voltage value is higher (lower). The CPU 11 in the case of inputting the signal of 0 (1) decides the non-grinding time (grinding time) according to a program stored on a ROM 18. Then the CPU 11 measures and displays the state of the grindstone on display devices 9 and 10 only in the case of deciding the non-grinding time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a grindstone balance state detection device and a grindstone wear state detection gi.

[Prior art] Conventionally, in a balance state display device for measuring and displaying the balance state of a grinding wheel, the balance state is determined based on the vibration caused by the unbalance of the grinding wheel itself. When measuring, vibrations caused by other factors such as grinding must be avoided. Therefore,
The operator operates this display device to measure the balance state during non-grinding when grinding is not being performed and the grindstone is spinning idly.

Also, the patent application No. 63-237860 previously filed by the present applicant
The wear state display device for measuring and displaying the wear state of the grindstone described in the above issue measures the amount of vibration generated when the grindstone is grinding the workpiece, and the amount of vibration generated when the grindstone is idling without grinding the workpiece. The amount of wear is determined based on the difference between the amount of vibration and the amount of vibration when the Therefore, the operator presses a button during grinding (when grinding is being performed) and during non-grinding (when no grinding is being performed) to cause the display device to distinguish between grinding and non-grinding.

``Problem to be solved by the invention'' However, with the two types of measuring devices mentioned above, it is necessary for the operator to distinguish between grinding and non-grinding, so it is difficult to carry out measurements in parallel with grinding work. was very complicated.

In addition, when periodically measuring an NG grinder using the above-mentioned balance status display device and wear condition display device, even though the grinding work is automatically performed under NG control, the work person needs to visit the grinding machine, N C
There is a problem that the advantage of IIJ ¥Id is halved.

The first object of the invention is to provide a grinding wheel balance state detection device that can completely automate the operation of detecting the balance state of the grinding wheel by automatically distinguishing between the time of grinding and the time of non-grinding. be.

A second object of the invention is to provide a grindstone wear state detection device that can completely automate the grindstone wear state detection operation by automatically distinguishing between grinding and non-grinding times. .

[Means for Solving Problem 1] A first invention provides a sound collection means for detecting grinding sound when a grinding wheel of a grinding machine is grinding a workpiece, and a sound collection means for detecting the grinding sound detected by the sound collection means. a discrimination means for discriminating between grinding and non-grinding based on the grinding wheel; a vibration detection means for detecting vibration generated in the grinding wheel; and a detection signal from the vibration detection means is input, and a discrimination result of the discrimination means is inputted. The gist of the present invention is a grindstone balance state detection device comprising a determination means for determining the balance state of the grindstone based on the vibration detected by the vibration detection means when the grindstone is not grinding.

A second invention includes a sound collecting means for detecting grinding sound when a grinding wheel of a grinding machine is grinding a workpiece, and a sound collecting means for detecting grinding sound when a grinding wheel of a grinding machine is grinding a workpiece, and a grinding time and a non-grinding time based on the grinding sound detected by the sound collecting means. a vibration detection means for detecting the vibration generated in the grinding wheel; a detection signal from the vibration detection means is input, and when the determination result of the discrimination means is during grinding, the vibration is detected. The amount of vibration detected by the detection means and the discrimination result are
The gist of the present invention is a grindstone wear state detection device comprising a determination means for determining the wear state of the grindstone based on the difference in vibration load detected by the vibration detection means during iI cutting.

[Operation] In the first invention, the determining means determines the balance state of the grindstone based on the vibration level detected by the vibration detecting means when the determining means determines that grinding is not being performed. Therefore, there is no need for the operator to distinguish between grinding and non-grinding.

In the second invention, the difference between the amount of vibration detected by the vibration detecting means when the determining means determines that grinding is being performed and the amount of vibration detected by the vibration detecting means when determining that grinding is not being performed. Based on this, the determination means determines the wear state of the grindstone. Therefore, there is no need for the operator to distinguish between grinding and non-grinding.

[Example] Hereinafter, a first practical example in which the present invention is embodied in a balance state display device for measuring and displaying the balance state of a grinding wheel will be described.
This will be explained according to Figure 2.

As shown in FIG. 1, an acceleration pickup 3 is attached to the spindle head 2 of the grinding machine 1 as a vibration detection means for detecting vibrations occurring in the entire grinding machine 1. -5 = -6 to rotationally drive the grinding wheel 4 of the cutting machine 1. The origin detection hinge 4 and 6 are installed in the Tanabata 5, and the same IJ;
The ξ point detection sensor 6 outputs the origin detection signal Y3 once during one rotation of the grinding wheel 4. Also, the 1-axis head 2 has an AE (A) at the lower sound collecting stage. One stick
A sensor 7 is installed to detect the grinding sound generated when the grindstone 4 grinds the workpiece W.

The acceleration big-up 3, the origin detection sensor 6 and the AE
Sensor 7 shows 1% balance status! ffi's 1-roll box 8. In front of this control box 8, a large number of LIE I) 9a are arranged in a ring to form a position table 9, in order to display the balance state. has a numerical display section 10
has been established.

Next, the electrical structure of the balance status display device [d] of this embodiment will be explained with reference to FIG.

The acceleration pickup 3 is connected to the central processing unit 11 (hereinafter referred to as CPU) installed in the unit box 8 via the bandpass noise filter 12, and the origin detection A sensor 6 is connected to the CPU 11. Also, when the sensor 1 and the sensor 7 are connected to the CPU 11 via a rectifier circuit 15, a bandpass filter 14, and an amplifier circuit 13, , the above-described position display section 9 and numerical display section 10 are connected.

The grinding sound detected by the sensor A is converted into an electrical sound wave signal, and the amplification circuit 13 amplifies the sound wave signal. The center frequency of the bandpass filter 14 is I M
It is set near HZ, and a sound wave signal of that frequency is extracted from the sound waves and input to the rectifier circuit 15.

The sound wave signal rectified by the rectifier circuit 15 is sent to the comparator circuit 1.
6 is input. The comparator circuit 16 compares a preset reference voltage value with the voltage value of the multiplexed signal, and if the reference voltage value is higher, it is set as "O", and if the voltage value of the sound wave signal is higher, it is set as [゛1]. A detection code signal is output to the Cl) U11.

Further, the CPU 11 includes a random access memory 17.
(RAM), I and a read-only memory 18〈]peOM) are connected, and the ROM 18 contains a program for determining the balance state of the grinding wheel 4, and a program for determining when grinding and non-grinding. The prognome is stored, and the C
I) LJ 1 1 is designed to measure and display the balance state of the grinding wheel 4 according to these blocks.The RAM 17 is designed to temporarily store data for processing performed by CI) U11. It has become.

Then, the CPU 11 receives 1' O from the comparison circuit 16.
When the detection code signal of J is input, it is determined that it is not grinding, and when the detection code signal of "1" is input from the comparator circuit 16, vI
It is determined that it is time to remove it.

Further, the CPU 1 performs the following operation of measuring and displaying the balance state of the grinding wheel I 14 only when it is determined that it is not grinding. That is, the CPU 11 determines the number of rotations of the grinding wheel 4 by measuring the pulse period of the origin position signal from the origin detection sensor 6, and also adjusts the frequency of the bandpass filter so that the center frequency corresponds to the number of rotations. A control signal is output to 12. In addition, the CPU 11 inputs the detection signal g from the acceleration kick-up 3 via the bandpass filter 12, and determines the maximum vibration of the grinding wheel 4 when the detected signal is not detected. The generated phase position is determined based on the origin position signal from the origin detection sensor 6. Furthermore, C P jJ 11 is the maximum swing lilI
Wi is displayed on the numerical display section 10, and L on the position display section 9 corresponding to the phase position where the maximum amount of vibration occurs.
Turn on FD9a.

Then, during the actual glass cutting work, when I turned on the power to the balance status display device to start the measurement, C l)
11 performs polishing based on the sound wave signal from the AE sensor 7.
The balance state of the grindstone 4 is measured and displayed only during non-grinding. Therefore, both display sections 9 and 10 of the control box 8 perform a display operation only when not grinding.

Ideally, the balance state of the grinding wheel 4 should be judged based only on the vibrations caused by its own unbalance. In the balance state display device of this embodiment, since the balance state of the grinding wheel 4 is measured and rotated only during non-grinding, the influence of morning grinding vibration etc. is avoided. It is possible to display highly reliable judgment results without being subjected to

Furthermore, since it is designed to automatically distinguish between grinding and non-grinding, there is no need for the operator to make this discrimination, and the work of measuring the balance state can be completely automated.

This embodiment is embodied in a balance state display device that displays the balance state of the grinding wheel 4. It may be embodied in a correction device. Even with this configuration, a highly reliable judgment result can be obtained based on the vibration during non-grinding, and the imbalance of the grinding wheel 4 can be automatically corrected with high accuracy according to the judgment result. . In this case as well, there is no need for the operator to distinguish between grinding 011 and non-grinding, making it possible to completely automate the balance correction work.

Next, this invention will show the wear condition of the grindstone 1! A second embodiment of the wear condition display device for measuring and displaying wear conditions (including clogging and spillage) will be described with reference to FIG. 3.4.

As shown in FIG. 3, the wear state display device of this embodiment has almost the same configuration as the balance state display device of the first embodiment, and the difference is that the position display section 9 is located on the control box 21. is not provided, and a grindstone designation switch 22 for specifying the type of inkstone 4 used for grinding is provided in the control box 21.

As shown in FIG. 4, the difference in the electrical configuration is that the field display section 9 is eliminated and the grindstone designation switch 22 is connected to the CPU 23. Also, CPU23
The ROM 2 4 connected to the grinding wheel 4 stores a program for determining the wear state of the grindstone 4 and a program for determining whether grinding is being performed or not. moreover,
The ROM 24 stores the amount of vibration at the wear limit corresponding to the type of each stone 4 designated by the grindstone designation switch 22. The CPU 23 is designed to measure and display the wear state according to these programs, and the RAM 25 is designed to temporarily store data of processing performed by the CPU 23.

Then, as in the first embodiment, C I) [J 2
3 discriminates between ω1 grinding and non-grinding based on the sound wave signal from the AE sensor 7.

Also, the CPU 23 generates an acceleration big-up 3 during grinding.
Based on the difference between the amount of vibration detected in the acceleration kick-up 3 during non-grinding, the following operation of measuring and displaying the wear state of the grindstone 4 is performed. below,
The procedure for measuring the wear state of the grindstone 4 using the wear state display device of this embodiment will be described in detail.

First, the operator specifies the type of grindstone 4 to be measured using the grindstone specification switch 22, and uses the grindstone 4 under pre-specified grinding conditions, that is, the predetermined grindstone rotation speed, feed rate, and depth of cut. , Grinding is performed using the workpiece material. During grinding, the grinding wheel 4 comes into contact with the workpiece W during its traverse, and during grinding. A non-grinding period in which grinding is not performed at a distance from the workpiece W is alternately repeated. The GPtJ23 specifies the amount of vibration generated in the grinding wheel Fi4 during grinding and during non-grinding, and calculates the difference between the two amounts of vibration.

Generally, the wear of the grindstone 4 occurs non-uniformly on its outer periphery, so that there are areas on the outer periphery of the grindstone where the grinding resistance is high and areas where the grinding resistance is low. Therefore, only when cutting the workpiece,
Vibrations occur in the grindstone 4 due to variations in grinding resistance. On the other hand, vibrations also occur when the grindstone 4 is unbalanced, but vibrations caused by this occur both when grinding and when not grinding. Therefore, the difference in the amount of vibration during grinding and during non-grinding described above can be regarded as the amount of vibration generated due to wear of the grindstone 4.

The CPU 23 compares this difference in vibration amount with the vibration amount at the wear limit stored in the ROM 24, calculates the ratio of the difference vibration amount to the wear limit vibration amount, and displays the numerical value display section 1.
■Display as % at 0. Therefore, if the grindstone 4 is unused, the display unit 10 will show a value around 0%, and if the grindstone 4 is worn out and is unusable, it will show a value around 100%. Dimensions. Further, when the grindstone 4 is in use, the display section 10 shows the number of grindstones depending on the degree of wear.

In this way, in the wear state display 1 & tl of this embodiment, the wear state of the inkstone Ij4 can be accurately grasped at each work.

Furthermore, the wear state will be judged based on the amount of vibration of the grinding wheel 4 during grinding and non-grinding. 4 on shift. 13, it automatically distinguishes between grinding and non-grinding, achieving complete automation of wear judgment work. I can tell you two things. Therefore, when measuring the wear state, the operator may perform grinding according to the specified grinding conditions.

In addition, in the balance state display device of the first embodiment and the wear state display device of the second embodiment, the high wave signal detected by the sensor 7 is further processed by the bandpass noilter 14 to Only a signal with a frequency of The discrimination operation may be performed based on a high-wave signal having a frequency far more in the listening range.

In addition, in the balance state display device of the first embodiment and the wear state display device of the second embodiment, the sonic signal 8 detected by the AE sensor 7 is converted by the comparison circuit 16 into a detection sign signal g of 1.0. I later entered it into C Puri 11 and 23, but
Instead, the combined signal is sent directly to the CPU via an AD converter.
It may also be possible to enter I 1.23.

[Effects of the Invention] As described in detail below, the grinding wheel balance state detection device of the second invention automatically distinguishes between grinding and non-grinding to determine the balance state of the grinding wheel. Qin 4 has the excellent effect of being able to completely automate the detection operation.

Moreover, according to the grinding wheel wear state detection device of the second invention, it is possible to automatically distinguish between grinding and non-grinding times and completely automate the grindstone wear state detection operation. The effect of Qin.

[Brief explanation of drawings]

Fig. 81 and Fig. 2 show the balance state detection device of the grinding wheel of the first practical example embodying the present invention; Fig. 1 is a JE view of the grinding machine and the balance state detection equipment; Figure 2 is a block diagram of the electrical configuration of the balance state detection device;
3 and 4 show a second embodiment of a grindstone wear state detection device embodying the present invention, and FIG. The physical diagram of the L grinding machine and the wear state detection device, and Figure 4 is a diagram showing the electrical W4 command of the wear state detection device. 1 is the {DL grinder, 3 is the vibration detection means 4 is the grindstone, 7 is the AE sensor as a sound collection means, 11.23 is the discrimination f stage and judgment. = 7-stage CF) L and W are the workpieces. Special Training Applicant: Nagase Tetsuchosho Co., Ltd. Attorney: 11 Patent Attorneys (1 person)
17

Claims (1)

[Claims] 1. Sound collecting means (7) for detecting grinding sound when the grinding wheel (4) of the grinding machine (1) is grinding the workpiece (W); and the sound collecting means (7). a discrimination means (11) for discriminating between grinding and non-grinding based on the grinding sound detected by the grinder; a vibration detection means (3) for detecting vibrations generated in the grindstone (4); Inputting the detection signal from the means (3), and based on the vibration detected by the vibration detecting means (3) when the determination result of the determining means (11) is non-grinding,
Judgment means (11) for judging the balance state of the grindstone (4)
A grindstone balance state detection device consisting of: 2. Sound collecting means (7) for detecting the grinding sound when the grinding wheel (4) of the grinding machine (1) is grinding the workpiece (W); and the grinding sound detected by the sound collecting means (7). Discrimination means (23) for distinguishing between grinding and non-grinding based on sound; Vibration detection means (3) for detecting vibrations generated in the grinding wheel (4); In addition to inputting a detection signal, the amount of vibration detected by the vibration detection means (3) when the discrimination result of the discrimination means (23) is for grinding, and the amount of vibration detected by the vibration detection means (3) when the discrimination result is for non-grinding. ) A grindstone wear state detection device comprising a determination means (23) for determining the wear state of the grindstone (4) based on the difference between the amount of vibration detected by the grindstone (4) and the amount of vibration detected by the grindstone (4).