JPH0631401Y2 - Dynamic balance correction device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a dynamic balance correction device for correcting an unbalance of a test body measured in a dynamic balance test.

[Prior Art] In a dynamic balance correction device that corrects an unbalance based on an unbalance amount and an unbalance angle measured by a dynamic balance test of a test body, a shape is grasped in advance based on a design drawing of the test body. The servo motor for rotating the test body held by the chucking device is driven to position the indexed correction position.
That is, the servo motor is driven to the correction position determined based on the shape of the test body that is grasped in advance to position the test body, and necessary corrections are made.

[Problems to be Solved by the Invention] In the above-described conventional positioning to the correction position, even if the servomotor is driven by feedback control, the range of the closed loop is up to this point, and the workpiece rotated by the servomotor is Since the chucking device and the chucked posture of the test body are completely ignored, positioning was done by open loop control.

Therefore, there are variations in the shape and size of the test body,
If the gears and the like of the power transmission unit of the positioning device have a dimensional deviation, the positioning will deviate by the amount of these errors, and there is a problem that it is not possible to perform precise positioning at the corrected position.

[Means for Solving the Problems] The present invention adopts the following configurations in order to solve the above problems.

That is, the dynamic balance correction device according to the present invention is a chucking device for a dynamic balance correction device in which an unbalance of a test body is measured by a dynamic balance test, a correction position is determined, and necessary correction is performed. An image sensor for scanning a test body held by a holding means such as, a binarizing means for binarizing an image signal output from the image sensor by a predetermined threshold value, and a time series from the binarizing means. The binary signal output in advance and the binary signal of the image signal preset as the correction position, and calculating the difference bit number, and the test object by the output signal of the calculating means. It is characterized in that a positioning device for a correction position is provided, which comprises a specimen holding attitude changing means for moving the holding means and changing the holding attitude.

[Operation] After performing rough positioning of the correction position based on the unbalance amount and the unbalance angle measured by the dynamic balance test, the test object is scanned by the image sensor and compared with preset data of the preset correction position. Then, the deviation of the holding posture of the test body is detected, and the test body holding posture changing means is driven based on this detection signal, whereby the positioning to the correction position can be accurately performed.

[Embodiment] FIG. 1 is a block diagram showing a configuration of a dynamic balance correcting apparatus according to an embodiment of the present invention. A test piece 1 such as an armature of a DC motor is held by a chucking device 2. The chucking device 2 is rotated by the positioning motor 3 while holding the test body 1, and the chucking device 2 is positioned so that the portion requiring correction detected by the dynamic balance test is located at the cutting position of the correction device (not shown). The positioning motor 3 is a servo motor or a pulse motor, and is driven by a positioning motor driver 6 that operates according to a command from the arithmetic and control unit 5.

The test body 1 held by the chucking device 2 is irradiated with light from the light source 9. The surface of the test body 1 illuminated by the light source 9 is scanned by the image sensor 10. The output signal from the image sensor 10 is input to the video amplifier 12 and is input to the comparator 13 as an image image signal. Slice level generation D / A device for comparator 13
The slice signal output from 14 is also input, and the image signal is binarized as a signal indicating the difference in the shape state of the surface of the test body according to the slice level (in the embodiment, the edge of the uneven portion on the surface of the test body). Will be a signal). The slice level, which is a threshold value, is arbitrarily set by the slice level generation D / A device 14 according to a command from the arithmetic and control unit 5. The binarized signal is stored in the arithmetic and control unit 5 and is subjected to data analysis and displayed on the CRT monitor 20 as an image signal.

When scanning is performed by the image sensor as shown in FIG. 2 using a one-dimensional sensor, FIG.
As shown in (a), the image output as an analog voltage image and binarized is as shown in (b) of the figure, and the change point of the image indicates the edge portion of the surface of the test body. When the two-dimensional image sensor is used for scanning as shown in FIG. 4, it is output as a multi-gradation image (for example, 256 gradations) as shown in FIG. The binarized image becomes a two-gradation image as shown in FIG.

In the arithmetic and control unit 5, the binarized signal is compared with the image signal at the preset correction position, in other words, the edge detection positions indicated by each are compared to determine the correction position of the test body. A gap is required. The detection of this positional deviation is obtained by the method of least squares. For example, the test object, the image range, and the cutting position have a positional relationship as shown in FIG. 6, the preset screen obtained by calculation is shown in FIG. 7 (a), and the actual image data screen is shown in FIG. 6 (b). It is assumed to be in the state shown. 7th
The numbers of bits shown in FIGS. (A) and (b) indicate the digitized edge detection positions on the surface of the test body. The most appropriate measurement equation for _obtaining x _o in these relations is 500−x _o = 490 x _o = 10 650 −x _o = 660 x _o = −10 1524−x _o = 1510 x _o = 14 1674−x _o = 1685 x _o = −11 (However, in order to avoid a large number of noises, the range of x _o is limited by mechanical precision, for example, and measurement equations other than −20 ≦ x _o ≦ 20 are omitted. .), A
_{When i} x _o = M _i , Σa _i ² = 4, Σa _i M _i = 3, and the standard equation becomes 4x _o = 3. Therefore x _o = 0.75
Therefore, it is only necessary to move 0.75 bits to the right on the screen shown in FIG. 7 (b).

When the difference bit number from the preset image is obtained in this way, the arithmetic and control unit 5 converts it into the pulse number of the positioning motor corresponding to the bit number and outputs an operation command to the positioning motor driver 6. Motor driver 6
Outputs a predetermined pulse signal based on this command to drive the positioning motor. By this driving, the holding posture of the test body 1 by the chucking device 2 is changed, the deviation to the correction position is corrected, and the positioning to the correction position is performed again.

FIG. 8 is a flowchart showing a positioning procedure in the dynamic balance correcting apparatus described above.

As described above, in the apparatus of the embodiment of the present invention, the positioning of the test body at the correction position is performed by the feedback control so that the holding posture of the test body is directly adjusted to the correction position while visually recognizing by the image sensor. Positioning can be performed more accurately than in the case where positioning is performed by grasping the position on a mechanical drawing as in the related art.

As described above, the one-dimensional or two-dimensional image sensor can be used, and a mechanical scanning type or an electronic scanning type by electron beam scanning or fixed scanning can be used.

[Effect of the Invention] As is apparent from the above description, according to the dynamic balance correction apparatus of the present invention, the test body at the correction position 1 can be accurately positioned, which has been impossible in the past. It is possible to improve the performance as a repair machine by achieving the reduction rate.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of the embodiment, FIG. 2 is a diagram showing an example of scanning by a one-dimensional image sensor, and FIGS. 3 (a) (b).
Is a diagram showing the process of image processing by the one-dimensional image sensor, FIG. 4 is a diagram showing an example of scanning by the two-dimensional image sensor, and FIGS. 5 (a) and 5 (b) are diagrams showing the image processing process by the two-dimensional image sensor. , FIG. 6 is a diagram illustrating a relationship between a test object, an image range, and a cutting position, and FIGS. 7 (a) and 7 (b) are diagrams illustrating a relationship between preset data and input data for explaining arithmetic processing, FIG. 8 is a flowchart showing the positioning processing procedure. 1 ... Test object, 2 ... Chucking device 3 ... Positioning motor (test object holding posture changing means) 5 ... Computational control device 10 ... Image sensor, 13 ... Comparator

Claims (1)

[Scope of utility model registration request] Claims: 1. A dynamic balance correction device in which an unbalance of a test body is measured by a dynamic balance test, and a correction position is determined to make a necessary correction. The dynamic balance correction device is held by a holding means such as a chucking device. An image sensor for scanning the test body, a binarizing unit for binarizing an image signal output from the image sensor with a predetermined threshold value,
The binarized signal output from the binarizing means in time series is preset as the correction position to the preset 2 of the image signal.
A modification comprising a calculation means for comparing the digitized signal with the digitized signal and calculating the difference bit number, and a test body holding posture changing means for moving the holding means of the test body according to the output signal of the calculation means to change the holding posture. A dynamic balance correction device comprising a position positioning device.