JPH05123753A - Stress relief device for rack bar - Google Patents

Abstract

PURPOSE:To provide the strain relief device which can easily be used and can improve the working efficiency by deciding the pressing force for the straightining of strain against the strain amount without relying to the experimental intuition. CONSTITUTION:Both ends of rack part of a rack bar 10 are supported with supporting means 2, and the strain is removed by pressing while moving the pressing point to the axial line direction of rack bar between both supporting means 2, and a storing means 12 to store the strain amount, etc., of rack bar detected with a detecting means, an arithmetic means 14 to calculate the pressing force based on the data are provided, the output of arithmetic means 14 is inputted to a pressing force controlling signal generating device 16, and received to the storing means as data, so the strain can be removed by driving the pressing means 6 with the output of the controlling signal generating means 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a strain relief device for a rack bar which supports near both ends of a rack portion and laterally pushes an intermediate portion. The present invention relates to a rack bar strain relief device capable of effectively performing strain relief with a pressure force corresponding to a strain amount by storing a relationship between the strain force and a current strain amount.

[0002]

2. Description of the Related Art Conventionally, a strain relief device for a rack bar corrects the strain by supporting both ends of the rack bar, abutting a press ram at a position where the strain is the largest, and further pressing. Is customary.

[0003]

However, in such a strain relief device, it is empirical to determine what kind of pressing force is applied when the strain is large.
There is a problem that it requires a great deal of skill in use and it is difficult to improve work efficiency. The present invention has been made in view of such circumstances, and an object of the present invention is to provide a strain relief device for a rack bar, which is easy to operate and can improve work efficiency.

[0004]

The present invention, which has been made to achieve such an object, is configured as follows. A As shown in FIG. 1, in a strain-removing device in which the strain is corrected by laterally pressing the rack bar 10 supported at at least two points, both ends of the portion of the rack bar 10 to be strain-relieved. Support means 2 for supporting
A detecting means 4 for detecting the strain amount of the rack bar 10 supported by the supporting means 2; and a rack bar 10 supported by the supporting means 2 with a pressing force corresponding to the strain amount. With the pressing means 6 for pressing in the direction perpendicular to the axis and the rack bar 10 pressed,
Relative moving means 8 for relatively moving the supporting means 2 and the pressing means 6 along the axis of the rack bar 10, the measured value of the strain amount before and after the pressing of the rack bar 10, and the pressing force applied by the pressing means 6. And a rack bar 10 supported by the support means 2 for storing input data
Calculating means 14 for calculating the pressing force of the pressing means 6 by comparing the amount of strain of the pressing means 6 with the data stored in the storage means 12.
And a control signal generating means 16 for generating a control signal for controlling the pressing force of the pressing means 6 based on the output of the comparison calculation means 14, the rack bar strain removing device. B In the rack bar strain eliminating device described in the paragraph A, the supporting means supports V near the both ends of the rack portion of the rack bar.
And a positioning cylinder device that presses the opposite end of the rack bar toward the positioning contact part, and two supporting parts having a V-shaped receiving groove, a positioning contact part that contacts the end surface of the rack bar, The detecting means is provided with a strain measuring device having a contact point with the rack bar at an intermediate portion of the both supporting portions to detect a strain amount, and the pressing means reciprocates in a direction perpendicular to the rack bar. A movably provided pressing part is made pressable by a hydraulic cylinder device, and at the tip of the pressing part, a roller part is arranged which can be pressed while rolling on the rack bar. A strain relief device for a rack bar, in which the supporting means is mounted on a slide table which is reciprocally movable in the axial direction, and the pressing means is provided in a fixed position. C In the rack bar strain removing device described in the item B, one strain measuring device is arranged on each side of the strain measuring device, and a calculation means for calculating a variation between the respective measured values and comparing with a certain allowable value The strain relief device for a rack bar, comprising: a strain relief completion determination means for stopping the output to the control signal generation means when the variation is equal to or less than a certain value.

[0005]

The rack bar is supported by the supporting means, and the strain amount of the rack bar detected by the detecting means and the pressing force for removing the strain are stored and accumulated by the storage means.
The accumulated content and the current strain amount are compared by the calculating means to calculate the pressing force corresponding to the strain amount, and a control signal for controlling the pressing force is generated based on this output, and the pressing means distorts the strain amount. Press the rack bar with the pressing force corresponding to. The relative moving means acts so that the pressing point of the pressing means against the rack bar moves while pressing along the axis of the rack bar.

[0006]

Embodiments of the present invention will now be described in detail with reference to the drawings. In FIG. 2, reference numeral 20 denotes a slide unit, which is constituted by a slide base 24 fixed to a machine base 22 and a slide table 26 reciprocally attached thereto. A pair of supporting members 28, 30 as a supporting means having a V-shaped receiving groove is attached on the slide table 26 to support the vicinity of both ends of the rack portion 33 of the rack bar 32 to be strained from below. A stopper 34 is attached to the support member 28 so that it can come into contact with the support member 28, and a positioning cylinder device 36 for pressing the opposite end surface of the rack bar 32 is attached to the other end of the slide table 26. The support members 28 and 30 are the pins 3
1 and 35 are attached so that they can be swung by a slight angle so that the rack bar 32 can be accurately centered when attached. A clamp arm 38 movably supported by a pin 37 is provided at one end of the slide table 26.
When one end of the rack bar 3 is pushed up by the clamp cylinder device 40, the other end of the rack bar 3 moves downward.
A clamping device is provided which is adapted to press the two ends.

Further, a guide device 43 is attached to the tip end portion of the piston rod of the pressing cylinder device 42 fixed to the machine base 22.
A pressing wheel 46 as a roller portion is rotatably mounted via a mounting member 44 guided by the guide member, and the piston rod is lowered to bring the pressing wheel 46 into contact with the strained position of the rack portion 33. The rack part 33 is pressed with the corresponding pressing force.
It is supposed to correct the distortion of. In this way, the pressing means is constructed. Further, when the slide table 26 is moved while the rack portion 33 is being pressed by the pressing wheel 46, the rack bar 32 is moved along the axial direction thereof. In this way, the relative movement means is configured.

As shown in FIG. 2, an abutment lever 48 of the detection means is arranged in the middle of the support members 28 and 30, so that the abutment lever 48 comes into contact with the circular outer peripheral portion of the rack portion 33 on the side opposite to the tooth portion. ing. The contact lever 48 is an L-shaped member having an intermediate portion rotatably supported as shown in FIG. 3, one of which is in contact with the rack bar 32 as described above, and the other is a differential sensor serving as a strain amount sensor. It is designed to abut the transformer 50. Reference numeral 52 is a tension spring, and 54 is an offset cylinder for preventing the contact lever 48 from contacting the rack bar 32.

The distortion removing work of the apparatus of this embodiment is controlled by a computer. That is, as shown in FIG. 4, a central processing unit (hereinafter referred to as CPU) 60, a memory 62 for storing input data to the CPU 60, operation data, etc., and a CPU 6
A computer provided with an arithmetic unit 64 and the like for performing various arithmetic operations according to a command from 0 is used. It should be noted that instead of the arithmetic unit 64, the arithmetic unit in the CPU 60 can also perform arithmetic operations. The contact lever 48 in contact with the circular outer periphery of the rack bar 32 gives a displacement corresponding to the amount of distortion to the differential transformer 50, and the amount of displacement is distorted via the differential transformer amplifier 68 and the A / D converter 70. The quantity data is input to the CPU 60 and stored in the memory 62. Further, the computing unit 64 compares the strain amount with the strain amount data and the pressure data already stored in the memory 62, and calculates a predetermined pressing force required for removing the strain. This calculated data is stored in the memory 62 via the CPU 60. Then, based on the calculated data, the CPU 60 commands a D / A converter 72, an electromagnetic proportional valve amplifier 74, and an electromagnetic proportional valve 76 to operate the pressing cylinder device 42 at a predetermined pressure, and the pressing wheel 46 causes the rack bar to operate. Press 32 to correct the distortion. During the distortion correction work, the slide table supporting the rack bar 32 is reciprocated to move the point of action of the pressing force in the axial direction of the rack bar 32. Further, as shown in FIG. 2, similar contact levers 80, 82 are provided on both sides of the contact lever 48.
Is placed, and the amount of strain at that position is measured.
When the variation in the amount of strain at one contact lever position becomes less than a certain value, the strain removal work is completed. In this way, the distortion removal end determination means is configured.
According to the program stored in the memory 62, the CPU 60 gives a command to the solenoid proportional valve 76 and the computing unit 64 to sequentially execute a predetermined operation to automatically correct the distortion of the rack bar 32. ..

The operation procedure of the distortion removing work by the embodiment apparatus configured as described above will be described with reference to FIG. In step P1, the rack section 3 of the rack bar 32 is detected by the detecting means.
The strain amount of 3 is measured. In Step P2, it is judged whether or not the maximum amount of strain is within the allowable range and the dispersion of the measured values at the three points is within the allowable range. If the result is OK, the distortion correction work is completed, and if the result is NG, then Proceeding to Step P3, in the first pressing, the pressing force that should be OK is calculated from the database stored in the memory 62 in Step P4, and in Step P5, the value obtained by multiplying the pressing force by the coefficient β (less than 1) is used. A new pressing force is set, and in step P6, the pressing force is applied to correct the distortion. Next, the process proceeds to steps P1 and P2, but in the case of NG, the second and subsequent pressing is performed in step P3, and the process proceeds to step P7 to calculate the strain amount due to the previous pressing force from the database. In Step P8, the ratio α between the calculated value of the strain amount and the actually measured value is calculated. In step P9, α and β are compared. If α> β, step P10
In step P11, the average value of α and β is calculated as a new β, and in the case of α <β, β is increased by 1 point. In step P12, the pressing force that should be an OK value is calculated from the database. Calculation is performed by taking β into consideration. In step P13, the pressing force multiplied by α is calculated as a new pressing force, and in step P6, the pressing force is applied to correct the distortion. After the correction, the process returns to step P1, and if the determination in step P2 is OK, the distortion correction ends. NG
In the case of, it is repeated as described above. In the above embodiment, the pressing means is fixed and the supporting means is moved, but conversely, the pressing means may be movable and the supporting means may be fixed. Further, it is also possible to use a servo valve instead of the solenoid proportional valve. Although the embodiments of the present invention have been described above, the present invention is not limited to such embodiments, and it is needless to say that the present invention can be implemented in various modes without departing from the scope of the present invention.

[0011]

Since the present invention is constructed as described above, it has the following effects. Based on the data indicating the relationship between the strain amount and the pressing force accumulated in the storage means, the pressing force required for strain relief of the rack bar can be calculated by the calculating means, so that the empirical intuition required for conventional strain relief can be obtained. It becomes unnecessary and easy to use, improving work efficiency. Particularly, when the same data indicating the relationship between the strain amount and the pressing force is stored for the rack bars of the same shape, the strain can be removed extremely efficiently based on the data. Further, since the supporting means and the pressing means of the rack bar can be moved relative to each other along the axis of the rack bar while the rack bar is being pressed, strain relief can be achieved as compared with pressing at a fixed portion. It is easy and the accuracy of distortion removal is improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing a basic configuration of the present invention.

FIG. 2 is a schematic explanatory view showing a main part of an embodiment of the present invention.

FIG. 3 is an explanatory diagram showing a part of the embodiment.

FIG. 4 is a system block diagram of the same embodiment.

FIG. 5 is a flowchart showing a procedure of a distortion removing operation of the embodiment.

[Explanation of symbols]

 26 slide table unit 28 support member 30 support member 32 rack bar 42 pressing cylinder device

Claims (3)

[Claims] 1. A strain relief device adapted to correct a strain by laterally pressing a rack bar supported at at least two points, for supporting both ends of a portion of the rack bar to be strain-removed. Supporting means, detection means for detecting the amount of strain of the rack bar supported by the supporting means, and the rack bar supported by the supporting means with respect to the axis of the rack bar with a pressing force corresponding to the amount of strain. The pressing means for pressing in a right angle direction, the relative moving means for relatively moving the supporting means and the pressing means along the axis of the rack bar in the state of pressing the rack bar, and the strain before and after pressing the rack bar. Storage means for storing the input data of the measured value of the quantity and the pressing force applied by the pressing means, the distortion amount of the rack bar supported by the supporting means, and the data stored in the storage means. And a control signal generating means for generating a control signal for controlling the pressing force of the pressing means based on the output of the comparison calculating means. A strain relief device for a rack bar, comprising: 2. The strain relief device for a rack bar according to claim 1, wherein the support means has two support portions having V-shaped receiving grooves for supporting the vicinity of both ends of the rack portion of the rack bar, and an end surface of the rack bar. The positioning means includes a positioning abutting portion that abuts, and a positioning cylinder device that presses the opposite end of the rack bar toward the positioning abutting portion, and the detection means has a contact point with the rack bar at an intermediate portion of the both supporting portions. A strain measuring device having a pressure sensor is provided to detect the amount of strain, and the pressing means is provided with a pressing portion that is reciprocally movable in a direction perpendicular to the rack bar and can be pressed by a hydraulic cylinder device. At the tip of the pressing portion, a roller portion that can be pressed while rolling on the rack bar is arranged, and the relative moving means mounts the supporting means on a slide table that can reciprocate in the axial direction of the rack bar. And the rack bar for stress relief device provided with the pressing means stationary. 3. The strain relief device for a rack bar according to claim 2, wherein one strain measurement device is arranged on each side of the strain measurement device to calculate a variation between the measured values and to set a certain allowable value. A strain relief device for a rack bar, which comprises a strain relief end determination means for stopping the output to the control signal generation means when a comparison means is provided and the variation is below a certain value.