JPH0582896B2 - - Google Patents

Description

[Detailed Description of the Invention] Purpose of the Invention (Field of Industrial Application) This invention provides a balance display device for a rotating body used for balancing various rotating bodies such as a grindstone or a spindle of a machine tool. It is related to.

(Problems to be Solved by the Invention) Japanese Patent Application No. 115909/1989, filed on June 6, 1980 by the same applicant as this application, describes the position and amount of unbalance of a rotating body. A configuration is shown in which the display can be performed by detecting body vibrations. However, depending on the mounting direction or mounting position of the vibration detector or the phase shift of the vibration detection circuit, a difference may occur between the actual unbalanced position of the rotating body and its displayed position. Therefore,
In order to make the display on the display easier to see, it is necessary to correct the display position to the actual unbalanced position based on the above-mentioned phase fluctuation value.

Structure of the Invention (Means for Solving Problems) This invention was made in view of the above-mentioned needs, and as shown in FIG. a vibration detection means 7 for detecting the origin position of the rotating bodies 3 and 4; an origin detection means 10 for detecting the origin position of the rotating bodies 3 and 4; and a vibration detection means 10 for detecting the origin position of the rotating bodies 3 and 4; a calculation means 24 for calculating the amounts, a display 12 including a plurality of display bodies 14 corresponding to each of the index positions, and a selection means 24 for selecting the index position corresponding to the maximum value among the calculated shake amount values. , a correction means 21 for correcting the selected index position based on the phase variation value, and a control means 24 for displaying the display body 14 corresponding to the corrected index position.

(Function) In the balance display device of the present invention, the display position of the display body 14 is corrected as follows. First, the unbalanced rotating bodies 3 and 4
When you rotate the display 1, as shown in Figure 2,
On 2, the amount of runout of A is displayed numerically, and
An indicator 14 of the indexed position of θa° is displayed.
Next, when a weight of weight W is attached to the index position of θo° and the rotating bodies 3 and 4 are rotated, the display 12
At the top, a display 14 indicating the deflection amount of B and the indexed position of θb° is displayed. Therefore, if vector OC is derived based on vector OA and vector OB, this vector OC will indicate the position and amount of action of the weight on the display. Therefore, the phase fluctuation value of the indicator 12 can be determined by the difference (θc - θo)° between the acting position θc° of the weight on the display and the actual mounting position θo°. Therefore, after operating the correction means 21 based on this phase fluctuation value, if the rotating bodies 3 and 4 are rotated with the weights removed, the display 1
The display body 14 on 2 is displayed at the actual unbalanced position of the rotating bodies 3, 4.

(Example) Hereinafter, an example embodying the present invention will be described based on the aspect.

First, the configuration of the main parts of the surface grinding machine in which the balance display device of this embodiment is installed will be explained based on FIG. 3. A table 2 for holding a workpiece W is provided on a frame 1. . A spindle 3 is rotatably supported above the table 2, and a grindstone 4 is attached to the tip of the spindle 3 so as to face the workpiece W from above. Also, spindle 3
A motor 5 for driving the spindle 3 is disposed at the base end of the spindle 3.

On the other hand, a piezoelectric acceleration pickup 7 as a vibration detection means is removably attached to the tip of a grindstone head 11 which can be raised and lowered relative to the column 6 of the frame 1 via a magnet (not shown). A light reflecting plate 8 is attached to the front surface of the grindstone 4 and rotates together with the grindstone 4. An origin detection sensor 10 serving as origin detection means is disposed via a stand 9 at a position facing the rotation range of the light reflecting plate 8.

Next, the configuration of the balance display device of this embodiment, which is connected to the surface grinding machine, will be explained. As shown in FIG. 4, the front surface of the display 12 is a display section 13, and a total of 36 indexing position indicators 14 are arranged in an annular row for every 10 degrees of rotation angle of the spindle 3. has been done. An origin indicator 15 is provided at a position corresponding to the 0 degree index position indicator 14. Further, in the center of the display section 13, a numerical display section 16 is provided which numerically displays the run-out amount of the grinding wheel 4 and the rotation speed of the spindle 3 by blinking seven LEDs or liquid crystal segments for one character. ing.

Further, at the lower end of the display section 13, there is a gain setting switch 17 consisting of three switches, low, medium, and high, for setting the amplification factor of the signal detected by the acceleration pickup 7; A rotation speed switch 18 for displaying the rotation speed of 3, and a hold switch 19 for holding the display state of the numerical display section 16 and the index position display body 14 are arranged in a row. At the top of each switch 17, 18, 19, a confirmation display 1 is provided so that the operating status of each switch can be confirmed.
7a, 18a, and 19a are provided.

Further, a position controller 21 as a correction means is provided at the lower end of one side of the display section 13. This position controller 21 is connected to the window hole 2.
2, and each ring 23 is integrally formed with a concave and convex operating portion 23a for rotating the ring. Above the position controller 21, there is a mode selection switch 35 for selecting either an adjustment mode including correction of the display position of the index position display 14 or a balance measurement mode, and a mode selection switch 35 for selecting either an adjustment mode including correction of the display position of the index position display 14 or a balance measurement mode. A condition setting switch 36 is provided for setting a condition as to whether or not a generating weight is attached. and,
By rotating each number ring 23 of the position controller 21 by an appropriate amount based on the display position correction data in the adjustment mode, it becomes possible to correct the display position of the index position display body 14 in angular units of 10 degrees. ing. Note that 20 shown in FIG. 4 is a power switch.

Next, the electric circuit of the balance display device of this embodiment will be explained based on the block diagram shown in FIG. Including calculation means, selection means and control means
The CPU 24 stores the program for the entire device.
The ROM 25 is connected to a RAM 26 having a data area for storing data. Also,
An input/output interface 27 is connected to the CPU 24, and the piezoelectric acceleration pickup 7 is connected to the input side of the CPU 24 via an A/D converter 28 and a filter circuit 29, as well as the origin detection sensor 10 and the hold switch. 19, a gain setting switch 17, a rotation speed switch 18, a position controller 21, a mode selection switch 35, and a condition setting switch 36 are connected, respectively. On the output side of the input/output interface 27, the index position display 14, origin display 15, numerical display 16, and confirmation display 17a, 18a,
19a is connected. Note that when the rotation speed switch 18 is operated, based on the origin pulse interval output from the origin detection sensor 10,
The CPU 24 detects the rotation speeds of the spindle 3 and the grindstone 4, and the values are displayed on the numerical display section 16.

As shown in FIG. 6, the filter circuit 29 includes a charge amplification circuit 30 that voltage converts the charge of the acceleration pickup 7 into an acceleration signal SG1, a voltage amplification circuit 31 that adjusts the vibration sensitivity with a variable resistor R1, and a voltage amplification circuit 31 that adjusts the vibration sensitivity using a variable resistor R1. An integrating circuit 32 that converts the signal SG1 into a speed signal SG2, a bandpass filter (BPF) 33 that selects a necessary signal, and a gain switching amplifier that switches the amplification factor of the speed signal SG2 based on the operation of the gain setting switch 17. The circuits 34 are connected in this order. The bandpass filter 33 includes a CPU.
An adjustment signal SG3 is input from 24 through the input/output interface 27, and the center frequency of the filter 33 is adjusted to synchronize with the rotational speed of the spindle 3 detected by the cooperation of the origin detection sensor 10 and the CPU 24. be done.

Next, the operation of the balance display device configured as above will be explained. FIGS. 7 and 8 are flowcharts showing programs that proceed under the control of the CPU 24. As shown in FIG. 7, when the power switch 20 of the display 12 is turned on, initial settings are made in step S1. After that, it is determined in step S2 whether or not the adjustment mode has been set by operating the mode selection switch 35. If the adjustment mode is not designed, that is, if the measurement mode is set, the process proceeds from step S3 to step S15 shown in FIG. 8, where processing for balance measurement and display is executed.

On the other hand, if the adjustment mode is set in step S2, the process advances to step S4 and the operation details of the condition setting switch 36 are confirmed. Here, the operator first rotates the spindle 3 without attaching the weight to the grinding wheel 4 according to the operation order, so if the condition setting switch 36 is switched to the position with the weight attached at this time, the step
At S5, an operation error is displayed on the numerical display section 16. On the other hand, if the condition setting switch 36 is correctly operated to the no weight position, the step
Proceeding to S6, by measuring and comparing the pulse intervals of the origin detection pulses output from the origin detection sensor 10, it is determined whether the rotational speeds of the spindle 3 and the grindstone 4 are in a stable state. When the rotation of the spindle 3 and grindstone 4 becomes stable, the measurement and display routine of step S7 is entered.
Each process after step S15 to be described later is executed based on FIG. 8, and the maximum value of the unbalance of the rotating bodies 3 and 4 is determined based on the vibrations generated as the spindle 3 and grindstone 4 rotate without weights. and the position where the unbalance occurs are detected, the maximum unbalance is displayed on the numerical display section 10, and the indexed position indicator 14 of the unbalance occurrence position is displayed blinking.

Next, after each of the above-mentioned displays become stable, when the hold switch 19 is turned on by the operator, the operation is confirmed in step S8 and the display state is maintained, and the unbalance when there is no weight is confirmed in step S9. The amount and position of , that is, its vector data (OA shown in Figure 2) are
It is temporarily stored in RAM26. Then, the operator temporarily stops the rotation of the spindle 3 and the grindstone 4 in this state, and after attaching a weight of the standard weight to the grindstone 4 at a predetermined angular position from the origin (θo° shown in Fig. 2), The condition setting switch 36 is switched to the weight on position and the spindle 3 is rotated again.

Subsequently, when it is confirmed in step S11 that the rotation of the spindle 3 and grindstone 4 is stabilized, the process proceeds to step S12, and similarly to step S7, the unbalance vector ( OB) shown in Figure 2 is measured and displayed. Then, in step S13, the vector of unbalance caused by the weight (OC shown in Figure 2) is calculated based on the vector data with the weight and the vector data without the weight, and the amount is displayed on the numerical display section 16, and the indexed position indicator 14 at that position (the angle of θc° shown in FIG. 2) is also displayed. Subsequently, when the ON operation of the hold switch 19 is confirmed in step S14, the display state is maintained as described above, and then the process returns to step S2 to complete the series of processing in the adjustment mode.

Therefore, the operator can subtract the mounting position (θo°) of the weight from the position (θc°) of the indexing position indicator 14, which is lit at this time (θc° - θo°), and then calculate the result. It can be recognized as a phase variation value between the balance display position and the actual unbalance position. Therefore, by rotating the number ring 23 by an angle corresponding to the phase fluctuation value in the position controller 21, the shift in the display phase of the display 12 during the subsequent balance measurement work can be eliminated. The unbalance display position by the indexing position display 14 can be made to accurately match the actual unbalance position, and the display can be easily seen and balancing work can be easily performed.

Next, the operation of the measurement mode will be explained based on the flowchart of FIG.

When the above-mentioned display position correction work is completed and the measurement mode is set by operating the mode selection switch 35, the result of the step S2 becomes NO and the process proceeds to step S15, where the rotation speed switch 1 is set.
8 operation is confirmed. When the rotation speed display mode is selected by operating the switch 18, the step
In S16, the rotation speed of the spindle 3 is detected based on the pulse interval of the origin detection pulse outputted by the origin detection sensor 10, and after that value is displayed on the numerical display section 16 in step S17, the process returns to step S15.

On the other hand, if the rotation speed switch 18 is not operated and the runout amount display mode is set in step S15, any one of the high, medium, and low gain setting switches 17 is set in step S18. Based on the ON operation, the amplification factor of the signal output from the acceleration pickup 7 is set, and the confirmation display 17a corresponding to the gain setting switch 17 operated in step S19 is lit.

In steps S20 and S21, the origin detection sensor 10
By measuring and comparing the pulse intervals of origin detection pulses output from the grinding wheel 3, the rotational speed of the spindle 3 and the grindstone 4 is detected, and it is determined whether or not the rotation is in a stable state. Then, in step S22, the center frequency of the bandpass filter 33 of the filter circuit 29 is adjusted so as to be synchronized with the rotational speed of the spindle 3 detected in step S21.

When the origin position of the grinding wheel 4 is detected by the origin detection sensor 10 in step S23, the process proceeds to step S24.
~ In S27, while the grindstone 4 rotates once, the A/
The maximum amount of data that can be processed by the D converter 28,
Or it matches the number of index position indicators 14.
36 runout amounts were detected and their data
It is stored in RAM26. And step S26
When the origin position is detected in step S28, the total number of detected runout amount data is divided by the number of indexed positions every 10 degrees, that is, 36, and then the process proceeds to step S29.
At , the shake amount data for each indexed position is summed, and the value is divided by the number of data to calculate primary average shake amount data. The calculated primary average runout amount data for each indexed position is stored in the data area of the RAM 26 in step S30.

In step S31, it is determined whether or not the runout amount data detection and storage process has repeated a preset predetermined number of rotations.If NO, the process returns to step S23 in step S32, and if YES, the process returns to step S23.
Proceeding to S33, the primary average runout amount data for each rotation is read from the RAM 26, and the secondary average runout amount data for each indexed position is calculated by summing these values and dividing by the set number of rotations. The calculated secondary average runout data is then
In S34, each indexed position is stored in the RAM 26.

In step S35, by comparing the secondary average shake amount data, the maximum shake amount data and the indexed position where it occurs are selected. step
In S36, the index position where the maximum shake amount has occurred is corrected based on the data corrected by the operation of the position controller 21. In step S37, the maximum shake amount data is converted into a numerical value that can be displayed on the shake amount display section 16. In step S38, it is determined whether the maximum runout amount is greater than or equal to a reference value, and if it is greater than or equal to the reference value, the step S38 is performed.
Proceeding to S39, the maximum shake amount is displayed on the shake amount display section 16, and the indexed position indicator 14 corresponding to the corrected maximum shake amount occurrence position is displayed blinking. Note that at this time, not only the display body 14 at the maximum shake amount occurrence position but also other display bodies 14 adjacent within a predetermined range centering on this display body 14 are displayed. However, while the other display bodies 14 are lit, the center display 14 is a blinking display, making it easy to confirm the position where the maximum shake amount occurs.

Next, in step 40, hold switch 19 is turned on.
When the ON operation is confirmed, the display state is maintained, and the confirmation display 19a lights up and displays the maintained state. If the switch 19 is not turned on, the process returns to step S2 in step S41 to repeat the above-described operations.

On the other hand, if the maximum runout amount is not equal to or greater than the reference value in step S38, that is, if it is determined that the spindle 3 and grindstone 4 are in a balanced state, the process proceeds to step S42, where it is determined that the balancing work has been completed. The characters "GOOD" to be displayed are displayed on the shake amount display section 16, and then the process proceeds to step S40.

Note that the numerical conversion in step S37 is as follows:
Based on the data calculated in the previous step, this
This can be carried out by converting into a relative value based on m'r (mass x radius), acceleration, velocity, displacement, or reference runout amount.

Further, according to the balance display device having the configuration of the above embodiment, the vector OC in FIG. 2 not only indicates the display position by the weight of weight W, but also
Since it also shows the displayed swing amount of the weight, by finding the ratio between the swing amount and the weight's actual weight W, it is possible to convert the swing amount of the rotating body into weight based on this ratio. can. Therefore,
Balance piece (weight) of the converted weight
By attaching it to the angular position of the rotating body that corresponds to the displayed index position indicator 14, it is possible to easily eliminate the unbalance of the rotating body.

Furthermore, as shown in FIG. 4, the index position indicators 14 on the display 12 are arranged so that the angle increases as the clockwise direction progresses, but the rotation direction of the spindle 3 of a grinding machine etc. depends on the model. Therefore, they are different. In this case, if a rotation direction changeover switch is provided on the display 12 and the switch is selectively operated according to the rotation direction of the rotating body, the data collection conditions will be the same, and a single banglas display will show the rotation direction. Balancing work for many types of rotating bodies with different values can be performed without any problem.

Effects of the Invention As detailed above, according to the present invention, the unbalance display position can be easily corrected to the actual unbalance position of the rotating body by the correction means, so the display becomes easier to see and the balancing work is easier. It has the excellent effect of being able to perform the process easily and accurately.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing the configuration of this invention, Fig. 2 is an explanatory diagram of the operation, Fig. 3 is a side view of a surface grinder, and Fig. 4 is a balance display device showing an embodiment embodying this invention. 5 is a block diagram showing the electric circuit, FIG. 6 is an electric circuit diagram showing the configuration of the filter circuit, and FIGS. 7 and 8 are flowcharts showing the operation. Frame...1. Spindle as a rotating body...
...3. Grinding wheel...4. Acceleration pick-up as vibration detection means...7. Origin detection sensor...1
0, Display unit...12, Index position display unit...1
4. Shake amount display unit...16, CPU including calculation means, selection means, and control means...24, ROM...2
5. RAM...26. Position controller as correction means...21.

Claims (1)

[Scope of Claims] 1. Vibration detection means 7 that detects vibrations caused by unbalance of the rotating bodies 3 and 4; Origin detection means 10 that detects the origin positions of the rotating bodies 3 and 4; The vibration detection means a calculation means 24 for calculating shake amounts for each of a plurality of index positions based on the signal from the origin position; and a plurality of display bodies 1 corresponding to each of the index positions.
4, a selection means 24 for selecting the index position corresponding to the maximum value among the shake amount calculation values, and a correction means 21 for correcting the selected index position based on the phase fluctuation value. and a control means 24 for displaying the display body 14 corresponding to the corrected indexed position.