JP3372314B2 - Method and apparatus for measuring assembly accuracy of vehicle body - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an assembling accuracy measuring method and device for easily confirming the assembling accuracy in each welding step when assembling an automobile body by welding.

[0002]

2. Description of the Related Art Conventionally, when assembling a vehicle body of an automobile, an assembling method has been adopted in which required components are temporarily temporarily attached and then finally attached through various welding processes to complete the assembling. There is. In other words, in this method, the front and rear floors and the front complete are integrally welded together in the previous step, whereas the left and right side panel outers and side panel inners are integrally welded together in the previous step. The roof and the roof panel are welded together, and the roof complete is temporarily attached by a general welding machine, and then transferred to the welding robot process and after a plurality of welding processes, each part is finally attached. By the way, since the components temporarily attached by the general welding machine are only partially welded to each other, when the vehicle body is transported, it is held in a hanger or is transferred to the vehicle body. Because the car body size may change, the car body is removed from the line as necessary to check the assembly accuracy. That is, if the welding is performed in the final attachment process while the dimensions are changed, products with different vehicle body sizes will be produced, which is a problem in terms of quality maintenance. This confirmation method is performed using, for example, a layout machine 51 as shown in FIG. 4, and the vehicle body W extracted from the line after the temporary attachment process is positioned on the positioning table 53 on the bottom plate surface 52, and the vehicle body W is measured. The portion to be marked is marked, and the coordinates of the marking portion are measured by the pickup portion 54. Then, the measured body W is returned to the line again, and is extracted from the line again before being put into the welding robot before being placed on the layout machine
The amount of change is grasped by carrying to 1 and measuring the coordinates of the previously marked place and comparing with the previous measured value. This amount of change is a strain that occurs when the vehicle body W is transported, and either the strain during transportation is eliminated, or the jig position of the general welding machine is adjusted in anticipation of that amount, or the welding robot in the next step. The amount of change is eliminated by adjusting the position of the jig in the process.

[0003]

However, in such a conventional measuring method, after the process of the general welding machine is completed, the vehicle body W is taken out, transported to the layout machine 51, mounted on the positioning table 53 and measured. However, it was necessary to convey it again to the welding robot process and return it to the line, and the time and labor required for the work were enormous. In addition, since the vehicle body size and the like tend to change during transshipment of the vehicle body W, it is not clear what process the dimensional change greatly affects.
There is a problem that it is difficult to accurately grasp the amount of change during the transfer process.

[0004]

In order to solve such a problem, the present invention can easily read the amount of change in the assembling accuracy of the vehicle body in each process, and appropriately analyze and take measures against factors that impair the quality in each process. In order to provide a measurement system configured as described above, the measuring device is positioned and fixed on the floor of the temporarily mounted vehicle body, and at least one of the vehicle width, the vehicle height, and the vehicle length is measured by the sensor inside the vehicle body provided in the measuring device. one of the amount of change Nitsu
Therefore, while carrying the vehicle body, the measurement is continuously performed in each process . Then, the measured data is displayed on the storage display unit.

[0005]

The measuring device is mounted on the vehicle body, and a sensor such as a laser sensor positioned inside the vehicle body is installed on the side surface, the upper surface,
Irradiation is directed toward any of the front and rear components, and the distance is measured to measure any change in vehicle width, vehicle height, or vehicle length in each step while transporting the vehicle body . If this is displayed on the storage display unit, it is not necessary to take out the vehicle body from the line for measurement, and the amount of change in each process can be easily measured.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a vehicle body assembly accuracy measuring method and apparatus according to the present invention will be described with reference to the accompanying drawings. FIG. 1 is an overall view of an assembling accuracy measuring device of the present invention, FIG. 2 is a process drawing of assembling, and FIG. 3 is an example of a display by a storage display unit.

First, an outline of an assembling process of an automobile body will be described with reference to FIG.

When the floor complete is introduced in the step 1 of introduction, the floor complete is sent to the general welding machine 2 and side panel completes which are simultaneously introduced from both sides are erected on both side surfaces of the floor complete. To be done. Then, the roof complete is set on the side panel complete, and in each case, the minimum necessary parts are temporarily attached by the two general welding machines.

After the temporary attachment, the vehicle body goes through the payout step 3 and is then transferred to the transfer device by the payout drop lifter 4 and transferred in the transfer step 5.

Next, the vehicle body is loaded into the spot welding step 7 by the loading drop lifter 6 and various spot welding robots 7a to 7d sequentially perform the final fixing of the joints.

When the final attachment is completed, the vehicle body is transferred to the transfer device by the payout drop lifter 8 and, after the transfer process 9 is performed, is transferred to the general-purpose process 11 by the input drop lifter 10.

This general-purpose process is a process for performing special welding, and the work such as over-welding, MIG welding, T-stat welding, and caulking is sequentially performed at stations such as 11a to 11e.

Next, the vehicle body is transferred to the transfer device by the payout drop lifter 12 and is transferred in the transfer step 13 and is input into the assembly and inspection step 15 in 15 by the input drop lifter 14.

The assembling and inspecting step 15 is a step of performing a comprehensive inspection after assembling the door, the trunk, the hood and the like on the vehicle body, and is provided with stations 15a to 15d. Then, the inspected vehicle body is delivered by 16 delivery drop lifters.

Next, the assembling accuracy measuring device 20 will be described with reference to FIG.

The assembling accuracy measuring device 20 inputs a frame 21 positioned on the floor of the vehicle body W, a plurality of laser sensors 22a-22h attached to the frame 21, and signals from the laser sensors 22a-22h. A storage display unit 23 for storing and displaying is provided.

The pedestal 21 is positioned, for example, while straddling a floor tunnel portion in the center of the vehicle body W, and can be fixed to the floor surface by bolts or the like.

Further, the laser sensors 22a to 22h are
For example, the laser sensors 22a and 22b are arranged at positions facing the left and right front pillars, the laser sensors 22c and 22d are arranged at positions facing the center pillar, and the laser sensors 22e and 22f are arranged at positions facing the rear pillar, respectively. A laser sensor 22g is arranged at a position facing the board upper, and a laser sensor 22h is arranged at a position facing the rear panel.

Of course, the sensor may be provided at a position facing the roof, or any of the above sensors may be provided.

Then, the laser sensors 22a to 22a
The pulsed laser light is emitted from h and the reflected light is received to measure the distance.

The memory display unit 23 is fixed to the gantry 21, and a battery 24 as a power source is also fixed to the gantry 21. If the memory display unit 23 is for a DC power source, it can be used as it is, but if it is for an AC power source, as shown in the figure, an inverter 25 is provided to convert it to AC and then used.

The memory display unit 23 has a number of channels corresponding to the number of laser sensors 22, but a plurality of devices having a small number of channels may be mounted.

Assembly accuracy measuring device 2 constructed as described above
0 is fixed to the floor of the vehicle body W with bolts in the payout step 3 shown in FIG.

Then, when the power is supplied and the device is operated from the fixed point, the change amount after that is stored and displayed in the memory display unit 2.
3 is stored, and when it is launched by a printer, for example, it is represented by a graph as shown in FIG.

Here, in FIG. 3, for example, the upper graph shows the measured values of the laser sensor 22a, and the lower graph shows the measured values of the laser sensor 22b. Is the reference value 0 and indicates the amount of change in the vehicle width direction ((outer B) is the direction in which the vehicle width widens, (inner B) is the direction in which the vehicle width narrows), and the horizontal axis represents time (the number shown above is Number).

That is, for example, the carrying step 5 after temporary attachment
Then, due to the relationship of the transport device, a force that pulls the side panel of the vehicle body W laterally acts, and since the joining force is weak, the amount of change in the (outer B) direction becomes large in the measured values of the laser sensors 22a and 22b. In the spot welding process of No. 7 and No. 7, it becomes clear that the amount of change becomes large only when the relevant panel is actually attached.

Therefore, if the measurement of such assembling accuracy is adopted when a new line is installed, a model is changed, the body quality is unstable, or daily body quality control is performed, It is valid. It should be noted that the type of the sensor in this embodiment is arbitrary and is not particularly limited to the laser sensor.

[0028]

As described above, according to the present invention, in the conventional case, after the temporary welding by the general welding machine, the car body is taken out from the line and conveyed to the layout machine, transferred to the layout machine, measured, and again. What had to be complicated work such as returning to the line and measuring again with the layout machine before putting it in the spot welding process,
Since the device only needs to be mounted once on the vehicle body, time and labor can be significantly reduced. Moreover, although any step problems with is was often difficult to explore what has occurred, if conventional, while conveying the vehicle body in the merits each
Since it is measured in each process, it is possible to analyze the cause easily because it is continuously displayed in a graph for each process, and it is possible to deal with it appropriately, which is very useful for improving the vehicle body quality.

[Brief description of drawings]

FIG. 1 is an overall view of an assembly accuracy measuring device of the present invention.

[Fig. 2] Assembly process diagram of vehicle body

FIG. 3 is an example diagram of a display by a memory display unit, in which an upper side is a measurement value of a sensor on the left side of the vehicle body, a lower side is a measurement value of a sensor on the right side of the vehicle body, and the vertical axis is a value measured at the time of temporary attachment. With reference value 0, the amount of change in the vehicle width direction ((outer B) is the direction in which the vehicle width widens, (inner B) is the direction in which the vehicle width narrows), the horizontal axis is time (the number shown above is the process number)

FIG. 4 is an explanatory diagram of a conventional measurement method.

[Explanation of symbols]

20 Assembly accuracy measuring device 21 stand 22 Laser sensor 23 Memory display

─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Kikuhei Kubo 1907 Hirata-cho, Suzuka-shi, Mie Honda Motor Co., Ltd. Suzuka Factory (72) Inventor Mihide Kusagawa 1907, Hirata-cho, Suzuka-shi, Mie Honda Motor Co., Ltd. Suzuka Factory Co., Ltd. (72) Inventor Norihiro Suetsuji 1907 Hirata-cho, Suzuka City, Mie Prefecture Honda Motor Co., Ltd. Suzuka Factory (56) Reference JP-A-2-20481 (JP, A) (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) B62D 65/00 B25J 19/00 B23P 19/00

Claims (2)

(57) [Claims] 1. A method for measuring the accuracy of assembly of a vehicle body, which measures the assembly accuracy of the vehicle body after temporarily mounting the required components of the vehicle body and then permanently mounting them by a welding robot or the like until the assembly is completed. Then , the measuring device is positioned and fixed on the floor of the temporarily mounted vehicle body, and a sensor inside the vehicle body provided in the measuring device conveys the vehicle body about at least one change amount of the vehicle width, the vehicle height, and the vehicle length, while transporting the vehicle body. A method for measuring an assembling accuracy of a vehicle body, which is characterized by continuously measuring in a process. 2. After temporarily mounting the required components of the vehicle body,
Until the assembly is completed by permanently attaching with a contact robot etc.
During the period, each work is carried out while transporting the car body regarding the assembly accuracy of the car body.
It is a device for measuring the accuracy of assembly of the car body that continuously measures
And a sensor that can be positioned and fixed to the floor of the vehicle body, and a sensor that is attached to this vehicle and faces the inside of the vehicle body from at least one of the components on the vehicle body side surface, vehicle body upper surface, or vehicle body front-rear surface. And an assembling accuracy measuring device for a vehicle body, which comprises a memory display unit for storing and displaying a signal of this sensor.