JP2820758B2 - Abnormality detection device for transfer press - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transfer press abnormality detecting device, and more particularly to a transfer press abnormality detection device which is suitably used for a transfer press in a press line of an automobile production plant. It monitors the operation position of the feed bar that carries the work composed of automobile parts and the like conveyed on the line by the belt at a predetermined position and conveys it to the press table,
The vibration of each transmission member that drives the feed bar is measured to monitor the deterioration and the like of each transmission member.
This is to detect an abnormality of the press.

2. Description of the Related Art In recent automobile production plants, a transfer press for automatically feeding a work (workpiece) is often installed in order to improve the productivity of a press line. After that, it has been commercialized.

In the transfer press described above, when a certain distance is conveyed between a plurality of press positions by a feed bar composed of, for example, two parallel square bars, the feed bar does not stop at a predetermined position due to deterioration of a machine or the like, and the workpiece is In some cases, the press line is not placed at a predetermined position on the press table in a predetermined posture, and the press line is temporarily stopped. Further, the deterioration of the machine progresses, and the gears, bearings and shafts of the transmission member may be damaged.

As for the detection of the abnormality of the stop position of the feed bar, which causes the workpiece not to be placed at the predetermined position in the predetermined posture, or the abnormality due to the failure or damage of the transmission member, the conventional hand-held vibrometer is used to detect the abnormality of the machine. The vibration of the part is measured.

Problems to be Solved by the Present Invention However, the operation of the feed bar and the transmission member of the drive mechanism thereof is not continuous, and intermittent batch operation is performed.
Since the moving speed of the moving part of each member changes or stops, when vibration is measured using vibration measuring means used in a continuously rotating machine or the like, it is difficult to detect an abnormality or find an abnormal point. This is because even if the vibration of a machine that performs a batch motion is measured, the amplitude and frequency of the machine do not have any regularity, so that it cannot be determined whether the machine is abnormal or normal.

Furthermore, in the transfer press machine, the vibration resulting from the press operation of the press machine is superimposed on the measured vibration result, which makes it more difficult to analyze the measured vibration waveform.

Furthermore, in the transfer press machine, since complicated movement is performed, it is dangerous to approach the vicinity thereof and measure the vibration, and there is a safety problem.

Accordingly, it is an object of the present invention to monitor the operation of a feed bar that operates intermittently, particularly, a stop position, and to determine the deterioration of each transmission member of the drive system of the feed bar at a specific predetermined operating position. The present invention is to provide a device which can monitor by measuring the vibration in the above and detect the abnormality of the transfer press more reliably than before.

Means for Solving the Problems In order to achieve the above object, the present invention provides a transfer press in which a feed bar position at a specific stop point in a series of operations of a feed bar as a support rod for mounting a work. The present invention provides a transfer press abnormality detection device characterized in that a distance meter for measuring the feed pressure is installed and the position of the feed bar is monitored.

Specifically, the operation of the feed bar of the transfer press is performed in conjunction with a cam mounted on a cam shaft that is rotationally driven by a motor, and a rotation angle detector such as a rotary encoder is mounted on the cam shaft. Detecting the stop time of the feed bar according to the rotation angle detected from the rotation angle detector,
The position of the feed bar is monitored by a laser light type non-contact distance meter disposed on a side perpendicular to the axis of the feed bar and / or on an axis facing the longitudinal end face of the feed bar. .

Therefore, the present invention includes three types of cams: a gripping cam that performs a gripping operation and an opening operation of a feed bar with respect to a workpiece, an ascending cam that performs an ascent operation and a descending operation, and a feed cam that performs a feeding operation and a returning operation. While fixed to the cam shaft, a cam follower is provided opposite to these cams, and each cam follower is connected to the feed bar via a transmission bar or the like, and the cam shaft is connected to a reduction gear mechanism, a bevel gear mechanism, or the like. And a mechanism for rotating the camshaft by the motor to sequentially grip the feed bar, perform a raising operation, a feeding operation, a lowering operation, an opening operation and a returning operation, and perform a six-operation process, Appropriate vibration pickup for motor and cam, cam follower, gear mechanism, bearing, transmission, feed bar, etc. A transfer device, comprising: a vibration meter connected to each vibration pickup, an A / D converter connected to the vibration meter, and a control operation device, and configured to measure the vibration of each of the members. An object of the present invention is to provide a press abnormality detecting device.

Further, according to the present invention, a rotation angle detector comprising a rotary encoder or the like is mounted on the camshaft, and the vibration of each of the above members is measured at a specific rotation angle detected from the rotation angle detector. The present invention provides an apparatus for detecting an abnormality of a transfer press according to the preceding paragraph, wherein an abnormality of each member is detected based on whether vibration is measured at the same position and at the same speed.

Function In the transfer press, the operation of the feed bar having the function of transporting the workpiece is determined by the transfer press.
It greatly affects the operation stability of the press. In particular, chatter vibration and run-out of the work immediately before stopping the operation of gripping the work and the operation of feeding the work, stop accuracy of the work (correct position and posture of the work). It is considered to cause aggravation.

Deterioration of any part of the drive system that operates the feed bar, such as looseness or damage to the gears, bearings, shaft keys or fitting parts, immediately manifests as a feed bar malfunction. The operation failure of the feed bar causes deterioration of the stopping accuracy of the work, and frequently causes the transfer press to stop. If the transfer press further proceeds, the transfer press will fail.

Therefore, monitoring the operation of the feed bar is the most important in the equipment diagnosis of the transfer press,
In particular, the operation monitoring at the final stage of the gripping operation stroke and the feed operation stroke is most easily able to detect the initial stage of equipment deterioration.

Therefore, in the present invention, as described above, a distance meter, preferably a laser light type, is provided on the axis perpendicular to the axis of the feed bar and / or on the axis facing the longitudinal end face of the feed bar. Install a non-contact distance meter,
A distance measurement is taken at a particular stop position of the feed bar, preferably at the time when the feed bar stops immediately after the completion of the gripping stroke and the feed stroke, and the position of the feed bar is monitored.

At the same time, in order to find out which part of the drive system of the feed bar has deteriorated, a vibration pickup is attached to the electric motor of the drive system and each transmission component, and further to the feed bar, etc. Vibration is measured at a specific operation time, and if vibration is measured at the same speed at the same position in each operation cycle of the part, the part is normal, and if a difference occurs in vibration, abnormality is detected. I have to.

Examples Hereinafter, the present invention will be described in detail with reference to examples shown in the drawings.

First, the transfer press equipment using the abnormality detecting device according to the present invention and the operation thereof will be schematically described with reference to the principle diagrams shown in FIGS. transfer·
In the press equipment, a work W is fed from an automobile part continuously conveyed by a conveyor belt V to a feed bar 1.
The press bars P1P2, P3, and P4 are transported along the press line L by A and 1B, and are spaced apart from each other by a predetermined distance between the feed bars 1A and 1B. As shown in FIGS. 2 and 3, the pair of feed bars 1A and 1B are brought close to each other as shown by the arrow Z1 in FIG. With the attachment A provided, the gripping working gap for supporting the work W from both sides is raised as shown in the direction of the arrow Y2 while the work W is supported. Along with the feed working gap advancing in the direction indicated by the arrow X1 while supporting the work W, descends as shown by the arrow Y1, and moves down the working gap W Z2 for mounting the work W on the corresponding press table P1 etc. As shown in the drawing, they move in the directions away from each other, and release the attachment A from the work W mounted on the press table. It is as to do back working to. While the feed bars 1A and 1B are returning, the work W mounted on the press table is subjected to press working.

The drive mechanism of the feed bars 1A and 1B will be described with reference to FIGS. 4 and 5. The lower part of the drive vertical shaft 2 which is rotationally driven by a motor and a reduction gear (not shown) arranged at the upper part of the transfer press equipment. , And the bevel gear 3 is meshed with a bevel gear 5 fixed to the tip of a horizontal drive shaft 4. A small gear 6 is fixed to the horizontal drive shaft 4, and meshes with a large gear 8 that fixes the small gear 6 to a cam shaft 7.

As described above, the ascending cam 9 is provided on the camshaft 7 which is driven to rotate by the engagement of the driving vertical shaft 2 gap bevel gear 3 gap bevel gear 5 gap horizontal driving shaft 4 small gear 6 gap large gear 8 by the electric motor. , Feed cam 10 and grip cam 11 are fixed. A rotation angle detector 12 composed of a rotary encoder is attached to a shaft end portion of the cam shaft 7.

As shown in FIG. 4, the rising cam 9 has a rising cam follower 13, the feed cam 10 has a feeding cam follower 14, and a gripping cam.
The cam followers 15 are arranged in sliding contact with the cam shafts 11 respectively.
The cam followers 13, 14, and 15 are operated in accordance with the rotation of the cam followers.

The ascending cam follower 13 is axially attached to one end of the ascending transmission bar 16, and has a rack portion 16a formed with teeth on the other side of the ascending transmission bar 16 as shown in FIG. The rack portion 16a meshes with a pinion 18 fixed to the lower end of a vertical shaft 17, and
A bevel gear 20 attached to the upper end of 17 is engaged with a bevel gear 22 fixed to one end of a horizontal shaft 21. On both sides of the horizontal shaft 21, gears 23 and 24 co-rotate, but are slidably mounted in the axial direction, and gears 25 and 24 of the same shape that mesh with the gears 23 and 24.
26 are installed. The above-mentioned gears 23 and 25 are provided with elevating attachments 27 protruding outside the feed bar 1A.
Gears 24 and 26 are engaged with the rack portions 28a and 28b of the elevating attachment 28 on the feed bar 1B side in the same manner. Therefore, the operation of the ascending cam follower 13 according to the rotation angle of the cam shaft 7 causes the above-described transmission members and the feed bar
1A and 1B are lowered in the direction of arrow Y1 by a predetermined distance, and arrow Y2
The processing distance is increased in the direction of.

The lower ends of the feed drive arms 31A and 31B are pivotally mounted on both sides of the main shaft 30 of the feed cam follower 14 which is in sliding contact with the feed cam 10, and levers 32A and 32B are respectively mounted on the upper ends of the drive arms 31A and 31B. I'm wearing Lever 32A is connected shaft 33
Feeder bar 1A via lever 34A gap connecting plate 35A gap support shaft 36A gap slide sleeve 37A gap lever 38A
Similarly, the other lever 32B also has a lever 34B gap connecting plate 35B gap support shaft 36B gap slide sleeve 37B gap lever 38B
And the feed bar 1B. In response to the operation of the feed cam follower 14 via these transmission members, the feed bars 1A and 1B are moved by a predetermined distance in a feed direction indicated by an arrow X1 and a return direction indicated by an arrow X2 in the figure.

The gripper cam follower 15 slidingly contacting the gripper cam 11 is connected to the gripper transmission bar 40 via a lever 41, and a rack portion 40a is provided on the other side of the gripper transmission bar 40.
Is formed. A pinion 43 attached to a lower portion of the vertical drive shaft 42 is engaged with the rack portion 40a, and a pinion 44 is attached to an upper end of the vertical drive shaft 42. The pinion 44 meshes with a rack portion 45a formed on a horizontal drive shaft 45 connected to the feed bar 1B, and the horizontal drive shaft 45
A rack portion 45b is formed on the other side, and a pinion 46 is engaged with the rack portion 45b. The pinion 46 has a rack 47 formed on a horizontal drive shaft 47 connected to the other feed bar 1A.
is engaged with a. Transmission member and feed bar 1
The gripping directions A and 1B are indicated by the gripping cam 11 and the gripping cam follower 14 according to the rotation of the camshaft 7, and by the gripping direction indicated by the arrow Z1 in the figure (the direction in which the feed bars 1A and 1B approach each other) and the arrow Z2. It is designed to move a predetermined distance from the opening direction.

The camshaft 7 makes one rotation (360
2), the feed bars 1A and 1B complete one cycle of the gripping operation gap raising operation gap feeding operation gap lowering operation gap opening operation gap return operation as shown in FIG. It is transported to a table and is stationary.

As described above, chatter vibration and swing of the operation immediately before the stop of the gripping operation and the feed operation of the feed bars 1A and 1B have a great effect on the deterioration of the stop accuracy of the workpiece W. Therefore, in order to monitor these stop positions, as shown in FIGS. 4 and 5, the outer portions along the line l2 perpendicular to the axis 1 of the feed bars 1A and 1B are each provided with a non-contact type laser beam. Are installed, and the reflecting mirrors 55A and 55B are attached to the feed bars 1A and 1B side. Therefore, the distance traveled (stop position) of the feed bars 1A, 1B is measured by receiving the reflected light from the reflecting mirrors 55A, 55B by the distance meters 50A, 50B. Rangefinder 50A, 50
B is connected to a control operation device (computer) 52 via an A / D converter 51 as shown in FIG. 4, and the control operation device 52 includes a rotation angle detector 12 attached to the cam shaft 7, Display 53
And the storage device 54 are connected.

In addition, as shown by the two-dot chain line in FIG. 5, the feed bar 1A, 1B is located at an outer position facing the longitudinal end faces 1A- ₁ , 1B- ₁ at a required distance from the feed bars 1A, 1B. Distance meters 50C and 50D may be installed on the axis 1 of 1B. At this time, the distance meters 50C and 50D may be installed together with the distance meters 50A and 50B, or only the distance meters 50A and 50B may be installed instead of the distance meters 50A and 50B. (However, in the following description of the operation, it is assumed that only the rangefinders 50A and 50B indicated by solid lines in FIG. 5 are provided.) With the above configuration, the rotation angle is detected by the rotation angle detector 12. 7, when the feed bars 1A and 1B are stopped to rotate by 12 ° from the time when it is detected that the cam shaft 7 has rotated 56.5 °, as shown in FIG. , And when the feed bars 1A and 1B stop feeding between 12 ° and 12 ° when the rotation of 148 ° is detected, the measured values from the rangefinders 50A and 50B are measured via the A / D converter 51. Is input to the control arithmetic unit 42. The control operation device 42 analyzes the stop position from the input signal, stores the data in the storage device 54, and displays an error on the display 53 when an error equal to or more than the set value between the stop position and the predetermined stop position, The stop position is monitored.

The measurement of the stop position by the distance meter is not limited to the gripping operation stop position and the feed operation stop position, and it goes without saying that the stop position may be set so that other operation stop positions can also be measured.

Further, a vibration pickup 6 is provided on the feed bars 1A and 1B (only the feed bar 1B is shown in FIG. 4).
0,61 are screwed and connected to these vibration pickups 60,61. The vibrometer 62 is connected to the rotation angle detector 12 and the control arithmetic unit 52, and the gripping operation stop position and the feed operation stop position detected from the rotation angle of the cam shaft 7 (and the stop positions of other operations). , The vibration is measured to determine whether chatter vibration occurs when the feed bar is stopped. Further, at the same time, it is measured whether or not the vibration at the time of the stop is the same as in each cycle, and when the vibration level is equal to or higher than the alarm value, it is displayed on the display 53 to monitor the deterioration of the feed bar.

In the present invention, further, the feed bars 1A, 1B
In order to monitor the deterioration of each member of the drive system to these members, a vibration pickup is appropriately attached to these members as well.
In this embodiment, as shown in FIG. 4, vibration pickups 63, 64, 65, and 66 are screwed to the ascending cam follower 13, the feed cam follower 14, the grasping cam follower 15, and the grasping transmission bar 40, respectively. These vibration pickups 63 to 66 are connected to a vibration meter 62 in the same manner as the vibration pickup attached to the feed bar, and a rotation angle detector.
Vibration is measured when a certain rotation angle of the camshaft 7 detected by 12 is reached. At the time of the measurement, as shown in FIG. 7, the measurement is performed at a rotation angle of T1 to T4. For example, for the gripping operation stroke in which the cam shaft 7 rotates between 0 and 62.5 °, 21 ° indicated by T1 Between 20 ° after reaching, the vibration pickup 65 attached to the gripping cam follower 15 and the vibration pickup 66 attached to the gripping transmission bar 40
, And a measurement signal is input to the control arithmetic unit 52 via the vibrometer 62. The control arithmetic unit 52 analyzes the vibration waveform based on the input signal, and stores data in the storage unit 54. The data of each cycle is stored in the storage device 54, and the vibration is measured at the same position and at the same speed in each driving cycle. The same constant vibration level will be detected. Therefore, when the vibration level is different and reaches the vibration level higher than the alarm value,
It is here that an abnormality has occurred in the member to which the vibration pickup is attached, and the abnormality is displayed on the display 53.

The same applies to the members of the other drive systems. In the ascending and descending movement steps (T2, T4), the vibration of the vibration pickup 63 attached to the ascending cam follower 13 is sampled.
In the feed operation stroke (T3), the vibration of the vibration pickup 64 attached to the feed cam follower 14 is sampled, and the deterioration of the cam followers 1, 14 is monitored.

The members to which the vibration pickup is attached are not limited to the above members, and are attached to necessary members such as an electric motor, a speed reducer, a bevel gear, a cam, various levers, shafts, bearings, and a cam shaft detected by the rotation angle detector 12. It is needless to say that the vibration can be sampled from the vibration pickup at a specific rotation angle, that is, when the member to which the vibration pickup is attached is operated, and the deterioration of the member can be monitored.

Advantageous Effects of the Invention As is clear from the above description, according to the transfer press abnormality detecting device according to the present invention, since the stop position of the feed bar is monitored by the distance meter, the abnormality of the stop position of the feed bar is detected. Thus, it is possible to quickly detect an abnormality in the stop accuracy of the work caused by the above. In addition, a vibration pickup is appropriately attached to each transmission member of the drive system, including the feed bar, and in each operation cycle, vibration is measured at a specific time when the member is operated. Even if batch operation is performed intermittently, vibration is measured each time at the same time and at the same position and at the same speed, so that the vibration pickup can reliably detect the abnormality of the member. I can do it.

In a transfer press, failure of an automatic machine that automatically conveys a work to the next press significantly impairs the productivity of the press line. There are very few serious stop accidents as transfer press failures,
Due to the deterioration of the machine, small stops, such as temporarily stopping the press line without the work getting on the predetermined position of the press table in the predetermined posture, are likely to occur frequently, and this may hinder productivity. ing. By using the abnormality detection device according to the present invention, it is possible to early detect the abnormality of the stop position of the feed bar and the abnormality of each member of the drive system,
Since the countermeasures can be made quickly and easily, the above-mentioned temporary stop can be eliminated.
This has the advantage that the productivity of the press can be greatly improved.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a schematic operation of a transfer press, FIG. 2 is an operation principle diagram of a feed bar for transferring a work used in the transfer press, and FIG. 3 shows a method of transferring a work by the feed bar. 4 and 5 are partial perspective views of a drive mechanism showing an embodiment of the present invention. FIG. 6 is a view showing the relationship between each operation stroke by a feed bar and the rotation angle of a cam shaft. The figure shows the relationship between the rotation angle of the cam shaft and the time of vibration detection and the time of distance detection. 1A, 1B… Feed bar 2… Drive vertical shaft 3,5… Bevel gear 7… Cam shaft 9… Up cam 10… Feed cam 11… Grip cam 12… Rotation angle detector 13… Up cam follow 14… Feed cam follow 15… Grip Cam follower 50A, 50B ... distance meter 52 ... control arithmetic unit 60, 61, 63-66 ... vibration pickup 62 ... vibration meter

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-61740 (JP, A) JP-A-63-122725 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) B21D 43/05

Claims (2)

(57) [Claims] A cam for performing a gripping operation and an opening operation of a feed bar with respect to a workpiece, an ascending cam for performing an ascending and descending operation, and a feed cam for performing a feeding operation and a returning operation; While fixing to the cam shaft, a cam follower is provided opposite to these cams, each cam follower is connected to the feed bar via a transmission bar or the like, and the cam shaft is connected to a reduction gear mechanism,
In cooperation with a motor via a bevel gear mechanism or the like, the cam shaft is rotationally driven by the motor, and the feed bar is sequentially gripped, and the feed bar is subjected to six operation strokes of an operation, a raising operation, a feeding operation, a lowering operation, an opening operation and a returning operation. As a mechanism, a vibration pickup is attached to a member of a drive system such as the motor and the cam, cam follower, gear mechanism, bearing, transmission, and feed bar, and a vibration meter connected to each vibration pickup, and an A / A connected to the vibration meter.
An abnormality detection device for a transfer press, comprising a D converter and a control operation device, and configured to measure vibration of each of the above members. 2. A rotation angle detector comprising a rotary encoder or the like is mounted on the camshaft. Vibrations of the respective members are measured at specific rotation angles detected by the rotation angle detector. 2. The apparatus according to claim 1, wherein an abnormality of each member is detected based on whether vibration is measured at the same position and at the same speed.