JPH09325054A - Inspection apparatus for backup process of multiaxial clamping apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a backup process inspection apparatus for a multiaxial clamping apparatus by which it is inspected whether or not a clamped part causing a clamping failure is backed up. SOLUTION: The inspection apparatus is provided with a transmitter 6a, a receiver 10, a coordinate data-forming means 12, a judging means 13 and a notifying means 14. The transmitter 6a is attached to a torque wrench 6, started at a predetermined torque thereby to transmit distance-measuring ultrasonic signals and at the same time transmit a trigger instructing a transmission time point as an electric signal. The receiver 10 measures a distance to the torque wrench 6 based on a delay time of a time point when the distance-measuring ultrasonic signal is received to a time point when the trigger is received. In response to a transfer position signal of a vehicle body 1, the forming means 12 forms two-dimensional coordinate data of a position of a clamped part causing a clamping failure to a reference position of the receiver 10 at a backup area. The judging means 13 compares data of a distance between the reference position and the failing clamped part operated from coordinate data when the trigger is received with distance data measured by the receiver 10. The notifying means 14 notifies according to a result of the judgment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device for indicating a tightening error portion detected by the multi-screw tightening device when tightening a plurality of tightening parts of a vehicle body by the multi-screw tightening device. The present invention relates to an inspection device for a backup process of a multi-axis tightening device for inspecting the correctness of the selection of the working part when the tightening part is manually back-up tightened with a torque wrench.

[0002]

2. Description of the Related Art As shown in FIG. 4, when an automobile body 1 conveyed on a line is simultaneously tightened by a multi-screw tightening device 2 at a plurality of preset positions, each tightening screw has a regular tightening position. If not reached, the multi-axis tightening device 2 detects the abnormal portion by detecting the tightening force, and the control panel 3
On the other hand, the tightening portion is displayed on the display device 5, so-called ANDON. As a result, the worker re-tightens with the torque wrench 6 in the backup area during line transportation. Then, when the predetermined torque set by adjusting the spring force for the wrench head is reached, the mechanism driven by the wrench head generates a click sound and at the same time operates the switch to send an operation signal to the control panel 3. are doing. If this activation signal is not sent, the line is stopped.

[0003]

In such a backup operation, if the ANDON display does not match the actually tightened portion that has been backed up, the automobile body 1 that is not properly tightened may flow out as it is. Although a click sound is generated when a predetermined torque is reached, a click sound may be generated even when the torque wrench 6 is slightly operated even in a normal portion, which may cause a backup error. . In order to avoid such a backup mistake, if an abnormality is displayed on the display device 5, all the tightened parts may be backed up, but the work time becomes longer accordingly.

In view of the above points, the present invention is an inspection for a backup process of a multi-axis tightening device for inspecting whether or not backup tightening is actually performed on a tightened portion where a tightening defect actually occurs. The purpose is to provide a device.

[0005]

In order to achieve this object, the present invention provides a fastening error detection, which is detected by a multi-axis fastening device for fastening a plurality of fastening portions of a vehicle body, according to claim 1. According to the display of the display device that indicates the part to be attached, when the tightening part that was instructed in the transport state of the vehicle body is backed up with a torque wrench, the backed up tightening part has a tightening error. It is an inspection device for a backup process of a multi-axis tightening device for inspecting whether it matches with or not, and it is attached to a torque wrench and is started when a predetermined torque is reached A transmitter that transmits a sound wave signal and at the same time sends a trigger indicating the transmission time point as an electric signal, and the distance to the torque wrench based on the delay time of the reception time point of the ultrasonic signal for distance measurement with respect to the reception time point of the trigger. Coordinate data creation that creates two-dimensional coordinate data of the position of the tightening part where the tightening error has occurred in the backup area relative to the receiver's reference position in the backup area And the correctness of the tightened part backed up by comparing the distance data between the tightened part where the tightening error occurred from the reference position calculated by the coordinate data at the time of receiving the trigger with the distance data measured by the receiver. It is characterized by comprising a judging means for judging and a notifying means for notifying according to the judgment result.

The conveyed vehicle body is tightened by the multi-axis tightening device, and if a tightening failure occurs at that time, the tightened portion is displayed on the display device. In the backup area, the worker tightens the backup, and at the predetermined torque of the torque wrench, the transmitter transmits the trigger and the ultrasonic signal together with the generation of the click sound. The receiver measures the distance based on the delay time at the time of receiving the ultrasonic signal with respect to the received trigger. The coordinate data creating means creates two-dimensional coordinate data according to the transport position of the vehicle body. The coordinate data creating means judging means collates the distance data at the time of receiving the trigger between the tightening portions where the tightening error has occurred from the reference position calculated by the coordinate data with the distance data measured by the receiver and backs them up. Determine whether the tightened part matches the tightened part where the tightening error occurred. Informing means Informing whether or not the tightened portion is correct according to the result of the determination.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION A backup process inspection device for a multi-axis fastening device according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. When a fastening abnormality occurs in the multi-axis fastening device 2, the control panel 3a displays the defective fastening portion on the display device 5 in response to the detection signal.

A torque wrench that mechanically generates a clicking sound at the time when a predetermined torque is reached and at the same time operates a switch to transmit a radio signal for operation notification is well known. Is equipped with a transmitter 6a which is activated by such a switch to transmit an ultrasonic signal for distance measurement and at the same time transmits a trigger indicating a transmission time point as an electric signal on a line 19.

Further, the control panel 3a has a receiver 10 for measuring the distance to the torque wrench 6 based on the delay time of the ultrasonic signal for distance measurement received by the receiving element 11 after receiving the trigger.
And coordinate data for creating two-dimensional coordinate data x and y (see FIG. 2) in the conveyance direction and in the orthogonal direction to the position of the tightening portion where the tightening error occurs with respect to the reference position O of the receiver 10 in the backup area 7. Whether or not the tightening portion backed up by collating the creating means 12, the two-dimensional coordinate data x and y and the distance data measured by the receiver 10 coincides with the tightening portion in which the tightening error has occurred is determined. Judgment means 13 for judging
Then, an informing means 14 for announcing whether the backup portion is correct or not according to the result of the determination is displayed, for example, on the display device 5.

In response to the detection signal of the vehicle detection sensor 9, the coordinate data creating means 12 takes in a position signal in the carrying direction of the rotating encoder 8 which is interlocked with the carrying device of the line, and at the same time the position in the direction orthogonal to the carrying direction. Assuming that the relationship is known, the coordinate data x and y with respect to the reference position O of the tightening portion designated by the multi-axis tightening device 2 are sequentially calculated. The judging means 13 judges whether the coordinate value x or y in one carrying direction matches the coordinate value y or x of the other side and the distance data r of the receiver 10 which are successively calculated based on the following formula, for example. It is determined whether or not the trigger is received.

Y = √ (r ² −x ² ) ... (1)

The operation of the backup process inspection device for the multi-axis tightening device thus configured is as follows. Performing tightening operations simultaneously transport state the tightening portion ₄₁ to ₄ of 4 points of the conveyed vehicle body 1 has, for example sub-frame portion is Tajikushime with device 2. At this time, if a tightening failure occurs, the defective portion is displayed on the display device 5 through the control panel 3a. When the worker is moved to the backup area 7, the operator holds the torque wrench 6 in the transport state and performs backup tightening on the defective portion shown in FIG. 2, for example, the tightened portion 4 ₂ , and clicks at a predetermined torque point. With generation of sound, the transmitter 6a transmits an ultrasonic signal together with a trigger signal.

As shown in FIG. 3, the receiver 10 creates distance data r based on the delay time ΔT of the reception time of the ultrasonic signal with respect to the received trigger signal. The judging means 13
The distance data r and the coordinate values x ₂ and y _{2 of} the tightening portion 4 ₂ sequentially created by the coordinate data creating means 12 are fetched at the time of receiving the trigger signal, and y is calculated based on the above-mentioned formula (1). Calculate, y
_It is determined whether or not the result matches _2, and the notification means 10 displays OK on the display device 5 when the results match, and NG when they do not match.
Display and re-tighten the backup.

In the above-described embodiment, discrimination is possible even when the distances are the same, for example, on concentric circles 4 ₂ and 4 ₃ with respect to the reference position O of the receiver 10.
When there is no possibility that the tightened parts will have the same distance, the determination means calculates the distance data r and the distance data calculated from the coordinate values x and y created by the coordinate data creation means 12 = √ It may be determined whether or not (x ² + y ² ) matches.

Further, the transmission of the trigger from the torque wrench 6 may be wireless transmission instead of wired transmission.
The notification means may be configured to notify both OK and NG or only NG by a buzzer.

[0016]

According to the first aspect of the present invention, it is surely confirmed whether or not the backup region by the torque wrench in the backup region matches the region designated on the display. Therefore, the number of man-hours is significantly reduced as compared to backing up all the tightened parts just in case. Claim 2
According to the invention of (1), it is possible to discriminate even when there are a plurality of tightening portions having substantially the same distance from the reference position of the receiver.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a backup process inspection device for a multi-axis fastening device according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating an operation of the inspection apparatus.

FIG. 3 is a diagram illustrating a principle of distance measurement of the inspection apparatus.

FIG. 4 is a diagram illustrating a backup configuration of a conventional multi-axis tightening device.

[Explanation of symbols]

 1 Automobile body 2 Multi-axis tightening device 6 Torque wrench 6a Transmitter 7 Backup area

Claims (2)

[Claims] 1. A transporting state of the vehicle body is instructed according to a display of a display device for instructing a tightening portion of a tightening error detected by a multi-axis tightening device for tightening a plurality of tightening portions of the vehicle body. When performing backup tightening on the tightened part with a torque wrench, multi-axis tightening for inspecting whether or not the backed up tightened part matches the tightened part where a tightening error has occurred An inspection device for a backup process of an apparatus, which is attached to the torque wrench and is started when a predetermined torque is reached and transmits an ultrasonic signal for distance measurement, and at the same time, an electric signal triggers for instructing the transmission time. As a transmitter, a receiver that measures the distance to the torque wrench based on the delay time at the time of receiving the ultrasonic signal for distance measurement with respect to the time of receiving the trigger, and the vehicle body. Coordinate data creating means for creating two-dimensional coordinate data of the position of the tightened portion where a tightening error has occurred in the backup area with respect to the reference position of the receiver in response to the transport position signal; The correctness of the backed up tightening portion is determined by collating the distance data between the tightening portions where the tightening error has occurred from the reference position calculated from the coordinate data with the distance data measured by the receiver. An inspection device for a backup process of a multi-axis tightening device, comprising: a judging means and a notifying means for giving a notification according to the judgment result. 2. The determining means, instead of collating the distance, collates whether one coordinate value of the coordinate data matches the other coordinate value and the coordinate value calculated from the distance data of the receiver. The fastening error prevention device for a multi-axis fastening device according to claim 1, wherein