JPS62289329A - Automatic bend straightening device - Google Patents

Abstract

PURPOSE:To straighten the bend of a work with automatic operation altogether by actuating a displacement measuring means and pressing means by a control means after supporting with a supporting means the work placed on a storage means by lifting it with a transfer means. CONSTITUTION:A start button 32 is inputted by placing the work 1 of one lot part on the upper step conveyor 2a of a work loader 2. The work 1 is lifted by the arms 13, 13 for work transfer and supported on the roller 4 of a work transfer truck 3. A displacement measuring instrument 21 is then moved toward the work 1 and when it is stopped at the prescribed position, a swing stopping device 46 motions up and down to stop the vibration of the work 1. The work 1 is then subjected to a displacement measurement by a displacement measuring instrument 21 over the axial direction and peripheral direction, which is stored in a computor 31 and based on the measurement value the conditions optimum for correcting the eccentricity are decided. The work 1 is then controlled so as to come just under the ram of a hydraulic press device 41 for the straightening objective part, the eccentricity is corrected over the whole periphery in the axial direction of the work 1 until the eccentric amount comes within the range of the set value and the work 1 is transferred onto the lower step conveyor 2b.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Object of the Invention] (Industrial Application Field) The present invention automatically measures the bending of a bar or tubular material having a circular cross section, and The present invention relates to an automatic bend correction device that automatically corrects bends.

<Prior Art> In general, for piping materials used as components of machinery, etc., a limit value of the amount of eccentricity is specified due to processing or functional constraints. Among these, the permissible eccentricity of components that are driven in the axial direction or components that rotate around an axis is severe.

Therefore, the above-mentioned bending is corrected during the material stage or during the parts processing process.

One way to correct the eccentricity of piping material is to use a hydraulic press, which presses the piping material between the ram (the member that presses the piping material from above) and the abutment (or anvil) (the member that contacts the piping material from below). There is a method in which piping material is installed and plastic deformation is applied to the piping material by pressure bending. However, with this method, it is necessary to accurately measure the amount of eccentricity at a predetermined location over the entire length of the piping material, and from the results, it is necessary to determine the push position and push amount that will most efficiently correct the eccentricity. , it is necessary to calculate the angle, and it is necessary to press exactly as it is calculated.

However, it is not easy for workers to perform all of the above work manually, especially when the piping material is long and corrections are to be made in 0.1H units, which requires a lot of work from the workers. This results in a burden. Therefore, there is a need to automate all of this.Currently, there are devices that automatically correct the eccentricity of short objects, but there is no device that can automatically correct the eccentricity of long objects, and there is a need to realize this. was.

<Problems to be Solved by the Invention> As mentioned above, although there are conventional devices that automatically correct the eccentricity of short objects, no device has been realized that automatically corrects the eccentricity of long objects. The bookmark depends on the work, and the present invention was made based on this point, and its purpose is to automatically detect the spacing of long objects and automatically correct them. The object of the present invention is to provide an automatic error correction device that enables the following.

(Means for Solving the Problems) That is, the automatic correction device according to the present invention includes a workpiece storage means that separately accommodates both a workpiece to be subjected to eccentricity measurement and a workpiece for which eccentricity measurement and correction have been completed. , a work support means that is movable along a traveling rail installed on a mount and that moves and rotates a workpiece whose eccentricity is measured and corrected in the workpiece axis direction, and the workpiece support means and the workpiece storage means; A workpiece transporting means for transporting the workpiece between and the above-mentioned workpiece supporting means! ! A deviation measuring means for measuring the eccentricity of a placed workpiece, a pressing means for correcting the eccentricity by applying a pressing force to the workpiece placed on the workpiece supporting means, a workpiece storage means, and a workpiece supporting means. , workpiece conveyance means,
The present invention is characterized by comprising a control device for controlling the deflection measuring means and the pressing means.

(Operation) That is, the workpiece accommodated in the workpiece storage means is transferred to the workpiece support means by the workpiece transfer means, and eccentricity is first measured by the deviation measurement means.

Next, the control G device calculates the conditions for making the correction based on the measured deviation, and based on this, the correction is made by the pressing means. The workpiece that has been corrected is transported to the workpiece storage means by the workpiece transporting means.

(Example) An example of the present invention will be described below with reference to FIG. FIG. 1 is a perspective view showing the configuration of the automatic correction device according to the present embodiment, and the reference numeral 1 in the figure is the piping material to be corrected (hereinafter referred to as a work), and in the figure, one work 1 is corrected. It is being operated, and several other works 1 are placed on the work lock 2. This work loader 2 is composed of a two-stage belt conveyor, and the work 1 before correction is placed on the upper belt conveyor 2a. The work 1 after soot removal is placed on the lower belt conveyor 2b. It's being bought. The belt conveyors 2a and 2b are both rotationally driven by a drive motor (not shown). These belt conveyors 2a and 2b are provided with work stoppers, and a plurality of works 1 are arranged at equal pitches.

On the other hand, the workpiece 1 being subjected to the above-mentioned correction operation is placed on each roller 4 of the two workpiece conveyance vehicles 3. The workpiece transport vehicle 3 runs on workpiece transport rails 6a and 6b installed on a pedestal 5. Four wheels 7 are attached to each workpiece carrier 3, and a workpiece carrier servo motor 9 is attached to the workpiece carrier 3, and a pinion 10 is attached to the rotating shaft of the workpiece carrier servo motor 9. is fixed. On the other hand, a rack 11 is attached to the pedestal 5111, and by driving the workpiece transport servo motor 9, the pinion 10 rotates while meshing with the rack 11, and as a result, the workpiece transport vehicle 3 is moved through the wheels 7. and travels on the workpiece conveyance rails 6a and 6b in the direction shown by arrow a in the figure. This also applies to the other workpiece transport vehicle 3. Incidentally, a power supply cable 12 is connected to the workpiece conveying servo motor 9.

The roller 4 is attached to the workpiece carrier 3 via a roller support portion 4a, and the roller supporter 4a is always urged upward by a spring (not shown) installed within the workpiece carrier 3. Therefore, when a force is applied to the row 54 from above, the roller 4, together with the roller support portion 4a, descends against the biasing force of the spring. Also work 1
The workpiece conveying arm 13 transports the workpiece from the upper belt conveyor 2a of the work loader 2 onto the row 54 of the workpiece conveying carriage 3. Two workpiece transfer arms 13 are also installed, and they move in the direction indicated by the arrow in the figure along a track 14 made of H-shaped steel. Further, each arm 13 a f is movable in the vertical direction (indicated by arrow C in the figure), and also performs an operation of grasping the workpiece 1 .

Reference numeral 21 in the figure is an attitude measuring device for measuring the amount of eccentricity of the workpiece 1. A plurality of site measuring devices 21 (six in this embodiment) are installed at predetermined intervals in the axial direction of the workpiece 1. That is, another pedestal 22 is attached to the pedestal 5, and another pedestal 23 is installed on this pedestal 22 so as to be movable in the direction shown by arrow C. This is made possible by installing a ball nut on the pedestal 23 side and moving this pole nut along the ball screw 24.

Furthermore, another pedestal 25 is attached to the pedestal 23 so as to be movable in the vertical direction indicated by the arrow d, and two of the deviation measuring devices 21 are installed on this pedestal 25. Above mount 2
5 is moved up and down by a pole nut and a ball screw 26. With this configuration, two eccentricity measuring devices are installed in each case, and the remaining two deviation measuring devices 21 are installed on the left side in the figure. These two eccentricity measuring instruments 2
1 is attached to a pedestal 29, its horizontal position is predetermined, and its vertical position (direction indicated by arrow e in the figure)
Only the position is adjusted by the ball screw 27. These deflection measuring devices 21 are automatically brought close to the workpiece 1 (distance M of 5 shoes from the surface of the workpiece 1) and positioned there during measurement. Further, while the device is performing a bending correction operation or loading/unloading the workpiece 1, it is evacuated to a predetermined position so as not to interfere with the operation. In addition, the above-mentioned deviation measuring device 2
Reference numeral 1 denotes a non-contact capacitance detection type displacement sensor, which can accurately measure the distance to the workpiece 1 in a non-contact manner in units of μm.

When measuring the displacement using the displacement measuring device 21, it is necessary to rotate the workpiece 1 in the direction indicated by the arrow f in the figure. The work rotation operation is performed by the roller 4 described above. That is, one of the four rollers 4 is configured to be rotationally driven by a pulse motor 28 installed on the traveling trolley 3, so that the workpiece can be rotated by driving the pulse motor 28 with a desired control pulse. 1 can be rotated by a predetermined angle in any direction.

In this embodiment, the workpiece 1 is rotated by 45°, but the number of control pulses required to rotate the workpiece 1 by 45° is calculated from the ratio of the diameter of each workpiece 1 and the diameter of the roller 4, and this is calculated by a computer. 31 automatically.

The eccentricity of the workpiece 1 is measured at six locations in the axial direction (six eccentricity measuring instruments 21 are installed), and each of the eccentricity measurements is performed at 5 points of 45° in the circumferential direction.

The pulse motor 28 and the servo motor 9 are driven by i.
The control computer 31 mentioned above controls the IJ. Programming [
It will be 0. This control computer 31 will be described later.

A hydraulic press device 41 is installed in the center of the device. This hydraulic press device 41 is equipped with a ram 42 movable in the vertical direction (direction shown by arrow 9), an anvil 43, a digital positioning sensor 44, a workpiece contact sensor (for example, a limit switch, etc.) 45, and the like. Further, a vertically driven workpiece steady rest device 46 is installed between the pair of anvils 43. This workpiece steady rest device 46
has a structure with a sponge 46a attached to the top,
Workpiece 1 immediately after bending the workpiece or moving it in the axial direction
This is to prevent measurement errors from occurring due to photographing. Therefore, it is configured to come into contact with the workpiece 1 at a predetermined timing, thereby eliminating errors caused by photographing the workpiece during unmanned automatic measurement. Furthermore, when pressurizing with the hydraulic press device 41, the "know-how" of skilled workers who manually corrected bends was taken into consideration.
Various determination routines are determined and stored in the control computer 31 so that the bending can be corrected in a short time. In addition, due to the quality of the product (referring to workpiece 1), it is necessary to preferentially correct the parts near both ends of workpiece 1, or to measure it again after applying pressure once and judge excess or deficiency from the result, and calculate plastic deformation. It has a self-learning function. All of these are made possible by the control computer 31 mentioned above.

The operation for correcting the eccentricity of the workpiece 1 will be explained step by step based on the above configuration.

(1) Place the work 1 for 10 tons on the upper belt conveyor 2a of the work loader 2. At this time, the stacking pitch of the works 1 is set to a predetermined equal pitch by the work stops attached to the belt conveyor 2a, as described above.

(2) Turn on the power of the device with workpiece 1 placed on it,
Turn on the start button 32. At that time, the operation disk 5
The workpiece 1 is placed on the CRT display 52 installed on the
A question will be displayed asking about the type of When this question is answered, the control computer 31 recognizes the eccentricity limit dimension predefined according to the type of workpiece 1, and thereafter performs correction operations on the workpiece 1 until the amount of eccentricity of the workpiece 1 falls within the specified dimension value. will be carried out. However, if the value does not fall within the specified value even after performing the correction operation a predetermined number of times, it is determined that the value cannot be corrected.

(3) The control computer 31 determines whether each drive section of the device is positioned in its initial state before the device starts a corrective operation. If there is a part that is not positioned in the initial state, it is automatically returned to the origin II.

(4) Start the corrective action below. First, the two workpiece transfer arms 13 are synchronously controlled, and ii! Lift up one workpiece 1. Then, the image is moved to above the roller 4 on the workpiece transport vehicle 3. Note that the workpiece conveyance platform ratio 3 is located at a position corresponding to the length of the workpiece 1 in the axial direction. After the workpiece conveyance arm 13 conveys the workpiece 1 onto the rollers 4, it returns to its original position. The workpiece 1 is now supported by the rollers 4 at both ends.

(5) Next, the deflection measuring device 21 moves toward the workpiece 1 on the roller 4. At this time, the distance between the deflection measuring device 21 and the workpiece 1 is continuously read by the computer 31, and when the deflection measuring device 21 reaches a position of 5as+ from the surface of the workpiece 1, the displacement measuring device 21 is stopped. Stop.

(6) The workpiece stabilizing device 46 then moves up and down to stop photographing the workpiece 1.

(7) Next, the roller 4 is rotationally driven by the pulse motor 28, and the workpiece 1 is rotated in a predetermined direction by 45 degrees.

And work 1 is axial direction 6! ! At this point, the displacement measurement device 21 measures the position at eight circumferential locations. Here, the deviation measurement is to measure the distance from the deviation measuring device 21 to the workpiece 1. The measured site is input to the control computer 31 and stored.

(8) After the deviation measurement by the deviation measuring device 21 is completed, the computer 31 calculates the amount of eccentricity, the eccentric angle, the maximum point of curvature of the bend, and the angle based on the measured values.

From these calculated values, optimal conditions for correcting eccentricity, ie, pressing position, pressing angle, pressing angle, etc., are determined.

(9) After each condition for correction is determined, the deviation measuring device 21 is evacuated so as not to interfere with the correction operation.

(10) Next, an operation command is output from the control computer 31 to each drive unit so that the part determined to be corrected is located directly below the ram 4 of the hydraulic press device 41. Specifically, the movement m for positioning the work 1 in the axial direction is output to the servo motor 9 for transporting the work, and at the same time, a predetermined movement m for positioning the pushing angle is output to the pulse motor 28 that drives the roller 4. Ill Ill pulses are output. The servo motor 9 and the pulse motor 28 are driven in accordance with these control signals to position the workpiece 1 at a predetermined pressurizing position directly below the ram 42.

(11) Next, after confirming that the determined part of the workpiece 1 is located directly below the ram 42 of the hydraulic press device 41, the ram 42 is lowered. At this time, the ram 42 descends at high speed until it contacts the work 1, and after detecting that it has contacted the work 1 (this detection is detected by the increase in load when the ram 42 contacts the work 1), the ram 42 descends at high speed until it contacts the work 1. 42 shifts to a lowering operation at low speed. As the ram 42 descends, the roller 4, together with the roller support portion 4a, descends against the biasing force of the spring.

(12) When the workpiece 1 contacts the workpiece contact sensor 45 installed on the anvil 43, the position of the workpiece 1 is
This is the position where the anvil 43 and the anvil 43 come into contact. The vJilt computer 31 reads and stores the dimensional values of the digital positioning sensor 44 at that time. Correction of the workpiece 1 by the ram 42 is then started from this position.

(13) The quantity control computer 31 in which the ram 42 presses the workpiece 1 is constantly reading the value of the digital positioning sensor 44. This allows the ram 42 to press the workpiece 1 by a predetermined amount. Here, the predetermined amount is the amount required to make the eccentricity of the workpiece 1 zero, and specifically, the amount of internal push of the peel elasticity limit +
(amount that causes plastic deformation). When the ram 42 is pressed by a predetermined amount, this state is held for a predetermined time.

(14) After a predetermined period of time has elapsed, the ram 42 is raised at high speed to release the hold state. This completes the pushing and bending operation.

(15) Next, an operation command signal is output to each drive unit so that the work 1 returns to the initial set position. In other words, a command signal is outputted to the workpiece conveyance servo motor 9 to return it to its original position in the workpiece axial direction, and the roller 4
A control pulse for returning to the original position around the axis is output to the pulse motor 28 that drives the axis. Based on these control signals, the servo motor 9 and pulse motor 28 perform predetermined operations to return the work 1 to its initial state.

(16) After confirming that the work 1 has returned to its original position, the series of operations described above are repeated.

The eccentricity correcting operation is continued over the entire circumference of the workpiece 1 in the axial direction until the measured eccentricity falls within the specified value range. At that time, the eccentricity was measured at 6 points in the axial direction and 8 points each, but the correction operation can be performed at any desired angle in the circumferential direction, for example, at 18 degrees from the origin.
If it is desired to pressurize the point, an ill control pulse to that effect can be output to the pulse motor 2. In the direction of the box axis, the pressing operation is performed at any one of the six locations mentioned above. In addition, if the eccentric tooth does not fall within the specified value range even after performing the correction operation a predetermined number of times, it is stored in the computer 31 as a work that cannot be corrected, and the correction operation for the next workpiece 1 is started. .

If the eccentricity of workpiece 1 does not fall within the specified value, there may be a problem with the snow-covered white body, or if the eccentricity of workpiece 1 is not within the specified value.
A case is assumed in which the deformation of is extremely complicated.

(17) The workpiece 1 whose eccentricity falls within the specified value range due to the I positive operation is conveyed from above the roller 4 onto the lower belt conveyor 2b by the workpiece loading arm 13. Then, a new workpiece 1 is conveyed from above the upper belt conveyor 2a to above the rollers 4. Thereafter, the eccentricity measurement and eccentricity correction operations are performed in the same manner.

(18) When the correction operation is completed for all the works 1 placed as correction targets on the upper belt conveyor 2a, the call light 61 is turned on. Then, the correction result (final eccentricity amount), pass/fail, deformation state, etc. of each workpiece 1 are displayed on the display 52. These data are printed out. This completes the correction work for 10 tons.

The workpiece 1 on the lower belt conveyor 2b is then transported to another location.

According to this embodiment, the following effects can be achieved. In other words, the work 1 to be corrected is transferred to the work loader 2.
Once placed on the upper belt conveyor 2a, the amount of eccentricity is automatically measured and corrected.

Therefore, the measurement of eccentricity and its correction work are easier than in the case where the work was conventionally done manually by workers, and the accuracy thereof is also extremely high. Furthermore, the deviation measurement by the deviation measuring device 21 is performed in a non-contact manner, so that even if the workpiece 1 to be corrected has undergone outer diameter polishing, the deviation measurement can be performed without causing any scratches. .

Next, a second embodiment will be described with reference to FIG.

This shows a configuration for positioning the workpiece 1 placed on the roller 4 in the circumferential direction, and reference numeral 101 in the figure is a reflective sensor. With this reflective sensor 101,
The origin of the workpiece 101 is detected. In other words, the above work 1
Draw a line on the edge using black marker ink, etc. The workpiece 1 is rotated at a low speed until this line can be read by the reflective sensor 101. This is the original position of work 1. Next, the workpiece 1 is rotated once, and the number of control pulses of the pulse motor 4a required for one rotation is counted. If this number of control pulses is divided into 8 equal parts, workpiece 1 can be divided into 45 parts.
The number of control pulses required to rotate by ° is calculated. This value is independent of the diameter of the workpiece 1, and its value can be used to perform various eccentricity corrections of the workpiece 1.

According to this embodiment, it is possible to provide deviation measurement and correction with much higher precision than in the first embodiment.

Although the above embodiments were directed to piping materials, the present invention is not limited thereto, and can be similarly applied to rods and the like.

[Effects of the Invention] As detailed above, according to the automatic bend correction device of the present invention, even long piping materials or rod materials can be placed on the work loader 2 and the rest can be automatically operated. Since the eccentricity measurement and its correction operations are performed by the system, the work is much easier compared to the case where workers had to do it manually in the past, and it has great effects, such as improving the eccentricity measurement and its correction by 11 degrees. It is.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a correction device showing an embodiment of the present invention;
FIG. 2 is a perspective view of a roller portion and its vicinity showing another embodiment. DESCRIPTION OF SYMBOLS 1... Work, 2... Work loader, 3... Work conveyance truck, 4... Roller, 13... Work loading arm, 21... Displacement measuring device, 41... Hydraulic pressure Press equipment.

Claims (5)

[Claims] (1) A work storage means that separately accommodates both the workpiece to be subjected to eccentricity measurement and the workpiece for which eccentricity measurement and correction has been completed, and a workpiece storage means that can travel along a traveling rail laid on a mount and is capable of measuring eccentricity. a workpiece support means for moving and rotating a workpiece to be corrected in the workpiece axial direction; a workpiece transport means for transporting the workpiece between the workpiece support means and the workpiece storage means; A deviation measuring means for measuring the eccentricity of a placed workpiece, a pressing means for correcting the eccentricity by applying a pressing force to the workpiece placed on the workpiece supporting means, a workpiece storage means, and a workpiece supporting means. An automatic bend correction device comprising: a control device for controlling a workpiece conveying means, a deflection measuring means, and a pressing means. (2) The automatic bend correction device according to claim 1, wherein the work supporting means includes a pulse motor and rotates the work at a desired angle in response to a control signal from a control device. (3) The automatic device according to claim 1, wherein the deviation measuring means has a plurality of deviation measuring devices in the axial direction of the workpiece and measures simultaneously at a plurality of locations in the axial direction. Bending correction device. (4) The automatic bend correction device according to claim 1, wherein the pressing means includes workpiece steadying means for preventing vibration of the workpiece. (5) The automatic bend correction device according to claim 1, wherein the control device determines the pressing conditions for the pressing means based on the deviation measurement result by the deviation measuring means.