JPH0394915A - Straightening device for warpage of shaft body - Google Patents

Abstract

PURPOSE:To prevent damaging measuring instrument when a shaft body is set by incorporating a position detector for a straightening head in a cylinder device with which the straightening head is vertically moved, measuring the warpage of a shaft body with the straightening head and also straightening the warpage of the shaft body. CONSTITUTION:The position detector 19 with which the position of the straightening head 9 is detected is incorporated in the cylinder device 10 and the warpage of the shaft body is measured by bring the straightening head 9 into slight contact with the shaft body 2 and also the warpage is straightened by pressing the shaft body 2 with the straightening head 9 with a stroke corresponding to the difference between the measured value and the set value. Therefore the measuring instrument isn't damaged when the shaft body 2 is set and so on.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention is directed to the use of a support body for correcting distortions and bends in shaft bodies such as automobile crankshafts and screw pump shafts.
This invention relates to a 4Ill correction device.

(Prior Art) A conventional shaft straightening device includes a frame having a support section that supports the shaft at a plurality of locations, and a straightening device for correcting the bend by pressing the shaft supported by the support section. It has a cylinder device that drives the head up and down, and a measuring device, such as a dial gauge, that is installed on a stand and has all heads in contact with the shaft.When measuring bending, the shaft is rotated and the measuring device measures the bending. It was Yokunari with a total of 41 ri (see, for example, Jōkai No. 54-174639).

(Issue 8 to be Solved by the Invention) In the conventional configuration described above, since the measuring instrument is installed on the pedestal, the structure on the pedestal becomes complicated. Furthermore, since the measuring instrument is exposed, it is easy to damage the measuring instrument, especially the M1 head, when setting the shaft. Furthermore, it is necessary to replace or adjust the measuring device frequently depending on the amount of bending of the shaft body. Furthermore, this makes it difficult to automatically supply the shaft, and automation cannot be realized. Furthermore, when measuring the amount of bending of the shaft body at a plurality of positions at appropriate intervals in the axial direction, many measuring instruments are required.

(Means for Solving the Problems) In order to solve the above problems, the shaft body bending correction device of the present invention includes a pedestal having a support portion that supports the shaft body at a plurality of locations, and a frame supported by the support portions. A rotation drive device that rotates the shaft body around its axis; a cylinder device that drives up and down a correction head that presses the shaft body supported by the support portion to correct bending; and the cylinder device. A lateral feed device that moves the shaft body supported by the support portion in the axial direction, and a control device that controls the rotation drive device, the cylinder device, and the lateral feed device, and the cylinder device is provided with the correction device. It has a built-in position detector that detects the position of the head, and can measure bending l. +7, controlling the rotary drive device and the cylinder device by the control device,
The shaft body supported by the support part is rotated continuously or intermittently around the axis, the straightening head is brought into light contact with the shaft body, and the position of the straightening head is detected by the position detector. By doing so, the bending of the shaft body is measured.

(Operation) The control device continuously or intermittently rotates the shaft body supported by the support part around the axis, brings the orthodontic head into light contact with the shaft body, and detects the position of the orthodontic head using a position detector. Detection is performed using a bend meter 7IllJ.

(Example) Hereinafter, an example of the present invention will be described based on FIGS. 1 to 6.

Fig. 1 is a front view of a shaft straightening device according to an embodiment of the present invention, and Fig. 2 is a side view of the same, in which both ends of a shaft 2, such as a screw pump shaft, are supported on a pedestal 1. A servo motor 4 serving as a rotational drive device for rotating the shaft body 2 supported by the support portion 3 around its axis is installed, and is installed upright at the four corners of the pedestal 1. A frame 6 is supported by pillars 5. The frame 6 is equipped with a cylinder device 7 as a lateral feed device and a slide base 8 that is moved in the left-right direction in FIG. 1 by the cylinder device 7. A cylinder device 10 is installed to drive the correction head 9 upward to correct the bend. A hydraulic unit 11 that supplies hydraulic oil to the cylinder devices 7 and 10 is arranged near the bottom of the pedestal 1, and a control device 12 that controls the servo motor 4 and the cylinder devices 7 and 10 is located on the side of the pedestal 1.
are placed close together.

FIG. 3 is a diagram showing the structure of the main part of the shaft straightening device, and the control device 12 is composed of a personal computer 14 and a programmable controller 15. The servo motor 4 and cylinder devices 7 and 10 are electrically connected to a programmable controller 15, and the programmable controller 15 is electrically connected to a personal computer 14. The cylinder devices 7 and 10 are connected to a pressure unit 11 via hydraulic piping.

As shown in FIG. 4, the cylinder device 10 includes a cylinder 16 and a piston rod 1 that is slidably fitted into the cylinder 16.
7, a servo valve 18 which incorporates a control circuit to be described later and which controls the working port, and a position detector 1 which detects the position of the straightening head 9 integrally formed at the tip of the piston rod 17.
It is composed of two parts. The cylinder 16 has an oil chamber 2
0 and 21 are formed, as well as a ura passage 23 that communicates the accommodation chamber 20 and the servo valve 18 via the filter module 22, and an oil chamber 2 via the filter module 22.
1 and the servo valve 18 are formed. The position detector 19 has a detection rod 25, which penetrates into a hole 17a formed in the piston rod 7 along the circumferential direction over almost its entire length.

The control circuit of the surf hub 18 is connected to the position detector 19 via a cable 26 and a cable 27.
It is connected to the programmable controller 15 via. One position detector is constituted by a magnetostrictive displacement sensor that utilizes the Wiedemann effect, for example, and detects the amount of extension of the piston rod 17, that is, the position of the correction head 9.

Note that a linear encoder, potentiometer, or the like may be used as the position detector 19. Further, the cylinder device 7 has the same configuration as the cylinder device 10.

As shown in FIG. 5, the control circuit built into the servo valve 18 includes two interface circuits for exchanging signals with the programmable controller 15, and a feedback signal processing circuit 30 for processing signals from the position detector 19. , a PID calculation circuit 31 that performs PID calculation based on signals from the interface circuit 29 and the feedback signal processing circuit 30, and a control signal that is pulse-radius modulated to the solenoid of the servo valve 18 based on the signals from the PID calculation circuit 31. PWM control circuit 32 that outputs
It is composed of:

Next, the operation of the control device 12 will be explained with reference to FIG. 6, which is a flowchart showing the operation of the control device 12.

When the shaft body 2 is set on the support portion 3 and a start button (not shown) of the control device 12 is pressed, the bending of the shaft body 2 is first measured in step a. That is, the cylinder device 7 operates to move the slide base 8 to a predetermined position, and the cylinder device 10 operates to bring the correction head 9 into contact with the shaft body 2 with a small force.

Note that the straightening head 9 may be brought into contact with the shaft body 2 by the weight of the piston rod 17 including the straightening head 9. Then, the servo motor 4 operates to rotate the shaft body 2, for example, once around the axis, and at this time, the position of the correction head 9 is detected by the position detector 19, and the data is transmitted via the control circuit of the servo valve 18. It is supplied to the control device 12.

The maximum measured value indicating the amount of deformation due to bending is the control device 1.
The information is digitally displayed on the display section 2 (not shown).

Note that the measurement may be performed by rotating the shaft body 2 by a predetermined angle around the axis using the servo motor 4. Also, the measurement point is shaft body 2
If there are multiple locations in the axial direction, the cylinder device 10 is sequentially sent to the measurement location by the cylinder device 7, and the above-mentioned total flpJ operation is performed for each measurement location.

Next, proceed to step b, and in step a total #IIll L
It is determined whether the measured value S1 of the curve is less than or equal to the setting 1!82 set in advance in the control device 12.

If it is determined that the measured value Sl is not less than the set value 82, the process proceeds to step C and a correction point is determined. That is, the cylinder device 7 operates to move the slide base 8 and position the cylinder device 10 at the position to be corrected.

Next, the process proceeds to step d, where the shaft body 2 is positioned. That is, the servo motor 4 is activated to rotate the shaft body 2 so that the apex of the bend is directed upward.

Next, the process proceeds to step e, where the bending of the shaft body 2 is automatically corrected.

In other words, the cylinder device 10 operates and bends for a total of 7 tpj.
The shaft body 2 is firmly pressed by the straightening head 9 with an optimum stroke amount according to the difference between the value S1 and the set value S2 to straighten the bend.

Next, proceed to step f and perform learning. In other words, the control device 12 has a learning function that understands and memorizes the work content and given conditions based on work experience, determines what should be done, and selects and implements the optimal control. Therefore, accurate and delicate control can be performed.

Next, return to step a and perform the same operation again. That is, the straightening operation is repeated while finely adjusting the stroke amount of the straightening head 9 until the measured value S1 of the bend becomes equal to or less than the set value 82.

If it is determined in step b that the total bending value S{ is less than or equal to the set value 82, the process proceeds to step g;
The completion of the correction work is notified by an indicator light or the like (not shown) of the control device 12, and the operation is stopped.

If there are multiple correction points in the axial direction of the shaft body 2, the cylinder device 1o is sequentially sent to the next correction point by the cylinder device 7, and the above correction operation is performed for each correction point, so that all the correction points are corrected. Step g is completed after the correction of the corrected area is completed.
Proceed to.

In this way, by incorporating the position detector 19 into the cylinder device 10 and bringing the correction head 9 into light contact with the shaft body 2, the bending of the shaft body 2; Since ipI is performed, there is no need to install the measuring instrument on the pedestal 1 as in the conventional device, so the structure on the pedestal 1 is simplified, and the arrangement of the support part 3, servo motor 4, etc. Great degree of freedom. Furthermore, since one position detector is built into the cylinder device 10, the measuring device is not damaged when setting the shaft body 2, unlike conventional devices, and durability and reliability can be improved. can. In addition, the position detector 19 is connected to the cylinder device 1.
0 and measures the bending of the shaft 2 by lightly abutting the straightening head 9 against the shaft 2, unlike conventional devices, the measuring device can be adjusted according to the amount of bending of the shaft 2. There is no need for frequent replacement or adjustment, and because of this, automatic supply of the shaft body 2 is easy and complete automation can be realized. Furthermore, since the cylinder device 7 that moves the cylinder device 10 in the axial direction of the shaft body 2 is provided, the bending of the shaft body 2 can be measured at any position in the axial direction.
Unlike conventional devices, there is no need to install a large number of 71p+ devices in total depending on the number of measurement points, so costs can be reduced. Also, as in the example in the text, the control device 1
If 2 is provided with a learning function, accurate and delicate control can be easily performed, and correction accuracy can be improved.

(Another Embodiment) In the above embodiment, the servo motor 4 was used as the rotational drive device, but the present invention is not limited to this configuration, and instead of the servo motor 4, for example, a stepping motor or the like may be used. May be used.

Further, in the above embodiment, the cylinder device 7 having the same configuration as the cylinder device 10 was used as the lateral feed device, but the present invention is not limited to such a configuration, and instead of the cylinder device 7, for example, a rack is used. - A pinion mechanism etc. may be used.

(Effects of the Invention) As explained above, according to the shaft bending straightening device of the present invention, the position detector is built into the cylinder device, and the straightening head is brought into light contact with the shaft, thereby reducing the bending of the shaft. Since the measurement is carried out, there is no need to install the measuring instrument on a pedestal as in conventional devices, and the structure on the pedestal is completely free, allowing for greater freedom in the placement of supporting parts, rotary drive devices, etc. is large.

Furthermore, since the position detector is built into the cylinder device, the measuring device will not be damaged when setting the shaft as in conventional devices, and durability and reliability can be improved.

In addition, by incorporating a position detector into the cylinder device and lightly touching the correction head to the shaft body, the bending of the shaft body can be measured by 7L.
ll1, there is no need to replace the measuring device or make frequent adjustments depending on the amount of bending of the shaft unlike in conventional equipment, and this also makes it easy to automatically feed the shaft. Yes, full automation can be achieved.

In addition, we have installed a cross-feeding device that moves the cylinder device in the axial direction of the free body, making it possible to measure the bending of the shaft at any position in the axial direction. Since there is no need to install a large number of measuring instruments, costs can be reduced.

[Brief explanation of drawings]

Fig. 1 is a front view of the shaft bending correction device in the one-length embodiment of the present invention, Fig. 2 is a side view of the same, Fig. 3 is a schematic diagram of the main parts thereof,
FIG. 4 is a schematic configuration diagram of the cylinder device, FIG. 5 is a circuit block diagram of a control circuit built into the cylinder device, and FIG. 6 is a flowchart explaining the operation of the control device.

Claims (1)

[Claims] 1. A pedestal having a support portion that supports a shaft body at a plurality of locations, a rotation drive device that rotates the shaft body supported by the support portion around an axis, and the shaft supported by the support portion. A cylinder device that drives a straightening head up and down for pressing a body to correct a bend, a lateral feeding device that moves this cylinder device in the axial direction of the shaft body supported by the support part, and a rotation drive thereof. a control device for controlling the device, a cylinder device, and a lateral feed device; the cylinder device has a built-in position detector for detecting the position of the correction head; and when measuring bending, the control device controls the rotation drive device. and controlling the cylinder device to continuously or intermittently rotate the shaft body supported by the support portion around the axis, and to bring the straightening head into light contact with the shaft body, so that the straightening head 1. An apparatus for correcting the bending of a shaft body, characterized in that the bending of the shaft body is measured by detecting the position of the shaft body with the position detector.