JPS6190857A - Detecting device of balance in machine tool - Google Patents

Abstract

PURPOSE:To accurately display unbalance, by selecting a vibration of a rotating work unit and a supporting shaft by a filter circuit from the detected vibration and obtaining a deflecting amount corresponding to each index position on the basis of an original point. CONSTITUTION:A supporting shaft 4 and a rotary wheel 3 are rotated, and if a switch is turned on, a device, performing initialization and discriminating the supporting shaft 4 to reach a fixed speed, calculates both oscillation of an original point signal from an original point detecting sensor 8 and deflection amount data Dn to be stored in each indexing position. The device, comparing averaged data calculated in each indexing position with the maximum deflection amount and each indexing position to be selected and correcting the maximum deflection angle while converting the maximum deflection amount, discriminates whether or not the maximum deflection amount is in a reference value or more, and the device, unless the maximum deflection amount is in a reference value or more, and the device, unless the maximum deflection amount is in the reference value or more, decides the rotary wheel 3 being in a balanced condition, displaying a good condition in a deflection amount display unit.

Description

[Detailed Description of the Invention] Object of the Invention (Field of Industrial Application) ゛ This invention relates to a balance detection device that detects and displays the rotational balance of a machine tool such as a grinder.

(Conventional technology) When adjusting the rotational balance of the grinding wheel of a grinding machine, the grinding wheel is attached to one shaft, and the shaft is placed on two horizontal bars, and the grinding wheel is moved from a stationary state. By observing the natural rolling direction and speed, the unbalanced position and amount of the whetstone was estimated, and corrections were made to balance the whetstone accordingly.

However, this method is inefficient because it relies on skill, and it does not take into account the unbalance of the grinding wheel support shaft of the grinding machine. There was a problem in that when a grindstone was attached and rotated, an imbalance occurred.

(Problems to be Solved by the Invention) This invention was made in order to solve the above-mentioned conventional problems, and it is necessary to attach a rotary workpiece such as a grindstone to a support shaft so that it is not unbalanced when it is being rotated. The object of the present invention is to provide a machine tool balance detection device that can detect and accurately display the balance.

Structure of the Invention (Means for Solving the Problems) In order to solve the above problems, the present invention provides an origin detection sensor for detecting the origin of the rotational direction of the support shaft, and an origin detection sensor that is attached to a part of the machine base. detection means for detecting vibration of the
a filter circuit that selects the vibration of the rotary workpiece and the support shaft from the vibration; and a control means that calculates the amount of runout corresponding to each indexed position with respect to the origin from the vibration of the rotary workpiece and the support shaft. A configuration is adopted in which a display means is provided for displaying the shake amount of each indexed position and a predetermined indexed position by the control means.

(Function) Based on the above configuration, the vibration of the machine base is detected by the detection means, and the vibration of the rotary workpiece and the support shaft is selected from the detected vibration by the filter circuit. And in the control means,
The vibration between the rotary workpiece and the support shaft is reduced to the maximum,
Each υ based on the origin detected by the origin detection sensor]
Determine the starting position and obtain the deflection award corresponding to each starting position. The control means displays the amount of one draw corresponding to each index position and the index position using the display means.

<Example> Hereinafter, an example in which the present invention is embodied in a surface grinder will be described based on the drawings.

As shown in FIG. 1, a table 2 for holding a work W is provided on a frame 1 of a grinding die. A support lqh 4 shown in FIG. 2 is rotatably attached to the table 2-hi, and a grindstone 3 is fixed at the tip thereof so as to face the workpiece W on the daple 2 from above. Behind the support shaft 4 is a motor 6 that drives the support shaft 4.
is located.

A piezoelectric acceleration pickup 5 is attached to the upper column 1a of the frame 1. Also, as shown in FIG. 2, a detection piece 7 is protruded from the outer periphery of the base end of the support shaft 4. In addition, an origin detection sensor 8 made of a photocoupler 9 is provided on the frame 1 outside the base end of the support shaft 4, and outputs an origin detection signal every time the detection piece 7 passes this part. It has become.

Note that the frame 1 includes all parts except the part rotated by the motor 6. Further, the acceleration pickup 5 has a magnet (not shown), and is attracted to a part of the frame 1 by the magnet. Therefore, the mounting position of the acceleration pickup 5 can be changed freely.

A display 10 is arranged and fixed on the outside of the frame 1, and a power switch 11 is provided on the side surface of the display 10 for turning on and off the balance detection device of this embodiment.

As shown in FIG. 3, the front surface of the display device 10 is a display section 12, and the display section 12 displays a total of 36 images at every 10 degrees of rotation angle, corresponding to each index position 1ffl of the support shaft 4. The index position display bodies 13 are arranged in parallel in a ring shape. Each indexing position display body 13 includes a red light emitting diode and a green light emitting diode. Further, an origin indicator 14 having a built-in light emitting diode is arranged to correspond to an index position indicator 13 for the angular position at which the origin detection sensor 8 generates a signal. A swing display section 15 is provided within the index position display body 13 to display the deflection of the support shaft 4, and the maximum deflection is also provided within the ring of the display body 13. A U mode display 16a and a minimum shake amount mode display 16b are provided, respectively, and a hold display 17 indicating a display hold state is also provided. These display bodies 16a, 16b, 1
7 each have a built-in light emitting diode.

Further, on both sides of the upper part of the display section 12, a mode changeover switch 18 for selecting a maximum shake finger display mode or a small shake m display mode, and a hold switch 19 for holding the display are arranged.

FIG. 4 shows a block diagram of the balance detection device in this embodiment, in which an input/output device (hereinafter referred to as 110) 21 and an oscillator 25 are connected to a central processing unit (hereinafter referred to as CPU) 20. These constitute a control means 41.The input/output device 21 includes, as input devices, a piezoelectric acceleration pickup 5 that detects vibrations of the machine base via a filtering circuit 24, a K point detection sensor 9, and a hold point detection sensor 9. The switch 19, the mode changeover switch 18, and as output devices, the indexing position display 13, the origin display 14, the runout indicator 15, the maximum runout mode display 16a, the minimum runout mode display 16b1, and the hold display 17 are connected. has been done. Further, a read only memory (hereinafter referred to as ROM) 22 and a random access memory (hereinafter referred to as RAM) 23 are connected to the CPtJ 20, the ROM 22 stores a program, and the RAM and 23 are provided with a data area for storing data. ing. Note that the oscillator 25 is provided to measure the number of oscillations generated by one rotation of the grindstone 3.

The wave circuit 24 shown in FIG. 5 is a circuit that detects the vibrations of the stand using the piezoelectric acceleration pickup 5, and detects the vibrations of the grindstone 3 and the support shaft 4. A voltage generated by the charge of the piezoelectric acceleration pickup 5 is amplified as an acceleration signal SG1 by an electromagnetic amplification circuit 32, and the charge amplification circuit 32 adjusts the voltage amplification, that is, the sensitivity of imaging. At this time, the sensitivity can be adjusted using the resistor R1. and a low-pass filter (
L, P, F) 34 and high-pass filter (T1.P.

F) 35 attenuates the acceleration signal SGI, the attenuated acceleration signal SG1 is interpolated by the voltage amplification circuit 36, and the bandpass filter (B, P, F) 37 applies the acceleration signal SGI to the rotation of the grindstone.
GI can be synchronized. At this time, synchronization is adjusted using resistor R2. Then, an integration circuit 38 converts the acceleration signal SG1 into a speed signal SG2, a voltage amplification circuit 39 adjusts the output impedance, and an A/D converter 40 converts the analog signal into a digital signal, which converts the speed signal S0.
2 into a digital signal and inputs the signal SG2 to the control means 41.

Although not shown, a remote control device is installed so that it can be operated at hand, and this device includes the same hold switch as the hold switch 19, a vibration sensitivity regulator R1, and a synchronizer
A adjustment device R2! 1iii has been obtained.

The operation of the balance test device configured as described above is explained in the sixth section.
The explanation will be given according to the chart in FIG.

The program in this flowchart runs on the CPU 20.
With the rotating grindstone 3 attached to the support shaft 4, the motor 6 is started to rotate the support shaft 4 and the rotating grindstone 3. When the power switch 1 is turned on in this state, the first 10 settings are made in step S1, and in step S2 it is determined whether or not the support shaft 4 has achieved steady rotation. At this time,
This determination is made by measuring the pulse interval of the origin detection pulse oscillated by the origin detection sensor 8 based on the oscillation pulse of the oscillator 25, and using the data for a specified number of revolutions (in this example, 2
(rotation) is stored in the pulse interval area of the RAM 23, and the CPU 20 compares the data within the next specified number of rotations (one rotation in this embodiment), and if they are approximately the same number of oscillation pulses, the data is stored in the pulse interval area of the RAM 23. to move to. If the pulse interval data do not match, the count is restarted from the beginning. In step 3, origin detection sensor 8 or 6
After the 9th point signal is oscillated, the process proceeds to step S4 at the same time as the 9th point signal is oscillated.

In steps 84 to S7, while the grinding wheel 3 rotates once,
RA the data D that can be processed by the /D converter 40.
The process is stored in M23, and the process proceeds to step S8 at the same time as the grindstone 3 completes one revolution.

In this step S8, the vertical suspension data D (detected) is changed by 10 degrees according to the number of vibration part data D.
Then, in step S9, the M data Dn divided every 10 degrees is used as data for each index position, and the total for each index position is calculated, and averaged data sn is calculated from the number of data. . In step SIO, the averaged data Sn for each indexed position is stored in the RAM 23. Then, in step 311, it is determined whether or not the set rotation vl (four rotations in this embodiment) has been repeated, and if it has been repeated, the process proceeds to the next step 812,
Otherwise, the process returns to step S3 and steps S3 to S11 are not repeated until the set rotation is reached.

In step S12, the average data Sn at each indexed position is taken out from the RAM 123; the average data Sn for the set number of revolutions is added for each indexed position, and the average data yn is obtained from the set number of revolutions for each indexed position. In step 813, the average data Yn is
Store on AM23.

From step S14 onwards, the mode changeover switch 18 is at its maximum setting, and steps 314 to 816 are processed within the specified number of rotations of the grindstone 3 (three rotations in this embodiment). In this step S14, the maximum image capture amount and each index position thereof (hereinafter referred to as angle) are selected by comparing the average data Yn, and in step S15, maximum shake angle correction and maximum image capture m conversion are performed. This maximum deflection angle correction sets a tolerance range from the maximum deflection value to the maximum deflection angle, and the angle of the whistle that falls within this tolerance range is referred to as maximum deflection angle correction. In addition, the maximum shake m conversion is the shake foot surface water body 15
It is to crush the tension that can be displayed on the screen.

In step 316, it is determined whether the maximum runout obtained in step S14 is greater than or equal to the reference value, and the base t11
If it is equal to or greater than the reference value, the process proceeds to step S17, and if it is not equal to or greater than the reference value, it is determined that the rotating grindstone is in a balanced state, and the process proceeds to step S819.

Then, "'good" is displayed on the shaking table water body 15 as a signal indicating the completion of balancing.

In step 817, the maximum runout found in step 815♀
In step 818, when the hold switch 19 is turned on, the hold display 17 indicating the maintained state is turned on while the display state is maintained. When the hold switch 19 is off, the process returns to step $3 and the maximum swing mode display action is repeated again.

Although the steps after step 814 have been described assuming the case where the amount of shake is the maximum, when the amount of shake is the minimum, the amount of shake is displayed with the same effect as when the amount of shake is the maximum. At this point, the mode selector switch 18 is in the minimum mode. That is, in the case of the minimum mode, the minimum swing and its drama are selected and the processes corresponding to steps 814 to S17 are performed.

Next, the display state of the display 10 will be explained. At the same time as turning on the switch 11, "-TI" is displayed on each digit of the surface water body 15, and the grinding wheel 3 is
At the same time as passing the origin, the origin indicator 14 lights up and turns on. The origin indicator 14 appears to continue to be lit because the lighting intervals are narrow. Then, as the rotation of the grindstone 3 stabilizes, the specified rotation speed (
In this embodiment, every 10 rotations), the vibration (2) is marked on the surface water body 15, and the position indicator 13 points the light emitting diode at the minimum or maximum tilt angle position. At this time, either the minimum or maximum display is lit by the mode changeover switch 18. Then, when the rotating grindstone 3 is balanced, the display 15 shows the runout.
ood” is displayed.

As described above, in this balance detection device J5, the maximum unbalance position and the distribution of the unbalance can be determined together with the support lllIh4 while the rotary grindstone 3 is attached to the support shaft 4 without removing it from the support shaft 4. Since the display 13 allows accurate recognition, no skill is required.

Note that the present invention is not limited to the above-mentioned embodiment, and the detectors may be changed to ones different from those of the above-mentioned embodiment 1, or
Changes can be made without departing from the spirit of the invention, such as arranging the display bodies in parallel in a straight line, arranging them in a MIJ pattern, and simultaneously displaying the shake range and its indexed position in analog form.

Effects of the Invention As detailed above, according to the present invention, it is possible to easily and easily recognize the unbalance of the rotary grindstone and the support shaft when a rotary workpiece such as a rotary grindstone is attached to the support shaft, and to correct the unbalance. This has the effect of making it possible to maintain a positive Mf in a well-balanced state.

[Brief explanation of the drawing]

Figure 1 is a schematic side view of the balance detection device installed on the grinding machine, Figure 2 is a partial sectional view of the support shaft, Figure 3 is a front view of the display, and Figure 4 is a block diagram of the control means. , FIG. 5 is a Haruwa circuit diagram, and FIG. 6 is a flowchart without showing the display function of the balance detection device. 4 is a support shaft, 5 is a piezoelectric acceleration pick-up, 8 is an origin detection sensor, 10 is a display, 20 is a central processing unit, 2
4 is a filter circuit. Patent applicant Nagase Iron Works Co., Ltd. Agent Patent attorney On 1) Hironobu Figure 1

Claims (1)

[Claims] 1. A machine tool having a support shaft (4) rotated by a motor (6) and a rotary workpiece such as a grindstone (3) mounted on the support shaft (4), an origin detection sensor (8) for detecting the rotational origin of the support shaft (4); a detection means (5) attached to a part of the machine base for detecting vibrations of the machine base; a filter circuit (24) that selects the vibration of the shaft (4); and a control means (24) that calculates the amount of runout corresponding to each indexed position with respect to the origin from the vibration of the rotary workpiece and the support shaft (4). 41); and display means (10) for displaying the runout amount of each index position and a predetermined index position by the control means (41).