JPS63265792A - Positioning method for vehicle body - Google Patents

Abstract

PURPOSE:To achieve the enhancement in the accuracy of positioning, in the method by which the positioning of a vehicle body is carried out by supporting it with a pair of locating pins and receiving members, by carrying out the correction of positions both in the vehicle-width direction and in the vehicle- length direction, after the inclination from the vehicle-length direction has been corrected while the locating pin on one side is fixed. CONSTITUTION:The front locating pin 4 on one side is fixed, and the locating pin 4 on the other side is moved, and while receiving members 6 (not shown) are turned, the inclination from the vehicle-length direction of a vehicle body W is corrected. Next, both pins 4, 4 are moved so as to align with the reference line in the front and rear direction to correct the position of the vehicle body W in the vehicle-width direction. And, both pins 4, 4 are moved in the front and rear direction so as to coincide with respective reference positions O1, O2, thereby the position of the vehicle body W in the vehicle-length direction is corrected. Thus, in such a state as the inclination of the vehicle body W in the vehicle-length direction is restrained as small as possible, the vehicle body W can be positioned in its proper position with a good accuracy.

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention is directed to a method for positioning a vehicle body on an automobile assembly line. (Prior art) The applicant of the present application previously filed a patent application No. 61-76481 @.
A pair of locating pins that can each be fitted into a pair of reference holes on both sides of the vehicle body in the vehicle 1] direction and that can be moved independently of each other in the horizontal direction; After detecting the positions of these reference holes and fitting both of the locating pins into these reference holes using a positioning device equipped with a horizontally movable receiver that supports the separated parts, the vehicle body is moved between the two. A method has been proposed in which the vehicle body is positioned at a normal position by moving both locate pins while being supported by the locate pin and the receiver. Figure 4 shows the work process of position correction by moving the locate pin, in which W is the vehicle body, Wa is the reference hole, 08.02 is the reference position where each reference hole Wa matches at the normal position of the vehicle body W, and Each reference hole-a

[21] From the state shown in Figure (a) with the two locating pins fitted, first fix one of the locating pins, then move the other locating pin so that the connections of both locating pins are parallel to the straight line 0.0□. Move it to the position shown in (b) to correct the inclination of the vehicle body W in the vehicle length direction,
Next, move both locate pins in the direction of 111 at the same time,
Adjust the position of the vehicle body W in the vehicle length direction so that each locate pin matches the straight line 0102, and finally move both locate pins in the vehicle width direction so that they match the straight line 01.02. It moves to correct the position of the vehicle body W in the width direction. (Problems to be Solved by the Invention) By the way, the hole edge of the reference hole Wa is elastically deformed by the pressing force from the locate pin, and the IN fitting clearance of the locate pin with respect to the reference hole -a is small. , this results in a relatively large play of the locate pin with respect to the M11" direction, which is equivalent to the case where the reference hole Wa is formed as a large diameter hole that allows play of the locate pin as shown in FIG. 4. The above-mentioned receiver turns and moves in parallel in the vehicle width direction [1''] as the vehicle body moves due to the movement of the locate pin, but when the locate pin is moved in the vehicle width direction, it separates from the locate pin in the vehicle length direction. A turning moment acts on the receiver. In this case, if each locating pin is fitted into each reference hole without any play, the tilt of the vehicle body W and therefore the rotation of the receiver will be regulated, and the receiver will move in parallel in the width direction of the vehicle. Because of the play, the receiver turns when the locate pin moves in the vehicle width direction, causing the vehicle body W to tilt as shown in Figure 4 ((1)), and the end in the vehicle length direction away from the reference direction. The positional deviation at the 7f position becomes large, and the positioning accuracy of the vehicle body W deteriorates.
The purpose is to promote an improved method of the previously proposed method that can improve the positioning accuracy of the f-body. (Means for Solving the Problems) In order to achieve the above object, the present invention provides a device that can be fitted into a pair of holes on both sides of the bottom surface of the vehicle body in the width direction, and that can be moved horizontally independently of each other. The positions of these H4 semi-holes are determined using a positioning device that includes a pair of controllable locating pins and a horizontally movable holder that supports a portion of the bottom of the vehicle body that is spaced apart from these reference holes in the vehicle length direction. After detecting and fitting both of the locating pins into the reference holes, the locating pins are moved while the vehicle body is supported by the locating pins and the receiver, and the vehicle body is positioned at the correct position. In this method, position correction by moving the locating pin is performed by fixing one locating pin and moving the other locating pin to correct the inclination of the vehicle body in the longitudinal direction, and then simultaneously moving both locating pins in the vehicle width direction. The second step (2) in which the position of the vehicle body in the vehicle width direction is corrected by moving the pins, and the third step (3) in which the position of the vehicle body in the vehicle length direction is corrected by simultaneously moving both locate pins in the vehicle length direction. Features. (Function) The effect of the present invention can be achieved by moving the location r11 to location 1 to the bin.
An explanation will be given based on FIG. 3 showing the correction work process. Figure 3 (a) shows the state in which each locating pin is fitted into each reference hole a, Figure 3 (b) shows the state in which the inclination of the vehicle body W is corrected in the first step, and Figure 3 (C) shows the state in which the vehicle body W is in the second step. Figure 4(d) shows the corrected position of the vehicle body W in the vehicle length direction in the third step. The problem is that the order of correction and position correction in the vehicle length direction is reversed. In the second step, both locate pins are moved in the direction of the vehicle so that they match the reference line X4, x2 in the vehicle length direction passing through 01.02, but due to the play of the locate pins with respect to the reference hole, Similar to the previous proposal described above, the receiver pivots to cause the vehicle body W to tilt with respect to the longitudinal direction of the vehicle. However, when both locate pins are moved in the vehicle length direction along the respective reference lines X, X2 so as to match OI and 02 in the third step, the locate pins are deviated rearward in the moving direction due to the inclination of the vehicle body W. In Fig. 3 (C), the upper reference hole Wa is pushed forward before the lower reference hole Wa, and the inclination of the vehicle body W is corrected, and both reference holes -a and Ha are pushed forward in the pressing direction. Both locate pins come into contact with each other evenly, and when doing so, no turning moment acts on the receiver, and the vehicle body W is moved parallel to the vehicle length along with the receiver, reducing the inclination with respect to the vehicle length as much as possible. The vehicle body is positioned while suppressing this. (Example) Referring to Figures 1 and 2, (1) is a hanger (2).
The positioning device (1) is positioned below the transport path of the vehicle body W on the machine base (3) with the vehicle length direction being the front and rear direction and the vehicle width direction being the left and right direction. A pair of left and right locating pins (4) (4) that fit in a pair of left and right reference standards, -a, and a pair of left and right reference holes Wb, i at the rear of the bottom of the vehicle body W. The rear locating pins (5) (5), and a pair of right and left receivers (6) (6) that contact the bottom surface of the vehicle body W in the middle thereof are provided so as to be movable up and down, respectively. Reference hole Wa, Wa
A pair of left and right detection means (7) (7)
The front locating pins (4) (4) are connected to the single holes -a,
It is now possible to move to a position directly below the . To explain this in more detail, a guide bar (8b) is inserted into and supported by a guide sleeve (8a) fixed to the front part of the machine base (3) so that it can be raised and lowered, and is moved up and down by a cylinder (8C). A vertically elongated lifting platform (8) is provided, and 61 pairs of elevators are moved back and forth by cylinders (9b) along longitudinal guide rails (9a) on both left and right sides of the vertically extending platform (8). 1 slide stand (9) <9>, and a cylinder (10b
), and a front locate pin (4) is provided on each second slide table 00.
) and a detection means (1) consisting of a visual sensor are each erected,
In this way, the name section locating pin (4) can be moved horizontally in the front, rear, left, and right directions independently of each other by the movement of the first slide base (9) and the second slide base (IG), and the elevating base (8) The horizontal movement can be controlled in accordance with the detection signals from each detection means (7). A lifting platform (V) is provided in the section, which is supported by a guide bar (Ilb) inserted into the guide sleeve (11a) fixed thereto so as to be freely raised and lowered, and which is moved up and down by a cylinder (11C), and a lifting table (V) is provided on the lifting table (II). A cylinder (12a) that responds to a signal from the detection means (7) is mounted along a fixed longitudinal guide rail (12a).
12b), and a second slide table (Ie) which is movable in the horizontal direction via a flat bearing (not shown) is provided on the first slide table ab. A pair of receivers (6) are provided at both left and right ends of the horizontally elongated fixed frame (13a) on the stand 13.
(6) is erected, and thus both the supports (6) and (6) are provided with a predetermined support relative to the vehicle body W due to the movement of the first slide base (I2). Horizontal movement in any direction by the movement of the platform a3 and vertical movement by the lifting platform av can be provided. Furthermore, a rocking table aΦ is provided at the rear of the cough machine table (3) and is swung vertically by a cylinder (14a) via a link mechanism (14b), and on the rocking table aΦ there are installed a A pair of left and right rear locating pins (5) (5) are erected in two sets, front and rear, via cylinders (5a) (5a), and one set of front and rear locating pins (5) are installed in front and rear according to the model of the rocking table 11@ after upward movement. The rear locate pin (5) (5) is selectively raised by a cylinder (5aH5a). Next, to explain the procedure for positioning the vehicle body W, first, after stopping the hanger (2) in a fixed position, the hanger (2) is
), each detection means (1) detects the position of each reference hole Wa in the front of the bottom surface of the vehicle body W placed on the The position of each detection means (7) is set as the reference position 01, 0□ and
) is moved to a position directly below the reference position 07.02 by the movement of the IO and kept on standby.
The reference position 07.0 of the current position in the direction of each reference hole is determined by image data from the visual sensor constituting each detection means (7).
This is done by calculating the displacement from 2 using an image processing device. Next, according to this displacement, the first and second slide bases (9)
Operate the QG to horizontally move each front locating pin (4) to a position directly below each reference hole 14a, and then move the
) and move each capital locating pin (4) up as shown in Figure 3 (
a) As shown, fit in the direction of each reference hole, and move the pair of receivers (0) <6> up and down on the vehicle body W by the upward movement of the lifting platform (8).
In this state, attach the vehicle body W to the hanger (2).
lift it from Next, the position of the vehicle body W is corrected by moving these front locating pins (4) (4). This correction work is carried out by fixing one of the front locating pins (4) and moving the other O-catebin (4) so that the connections between the two bins (4) are at the reference position, as shown in Figure 3(b). Move it so that it is parallel to the connection 0102 of the
) (6) on the second slide table (13) and correcting the inclination of the vehicle body W with respect to the vehicle length direction, and both pins (4) (4) as shown in FIG. 3(C). as,
The position of the vehicle body W in the vehicle 11] direction is corrected by moving in the left-right direction so that each of the bins (4) coincides with the reference Q line x 1 x 2 in the longitudinal direction passing through each reference position 01.02. 2 steps and
Both bins (4) (4) are moved in the longitudinal direction along the reference lines This is carried out in the order of the third step of correcting the position of W in the longitudinal direction of the vehicle, and as explained in the section of the above-mentioned operation, the vehicle body W is positioned with almost no inclination in the longitudinal direction of the vehicle. The displacement of the rear part of the vehicle body from the normal position is significantly reduced compared to the previous proposal in which the position in the width direction of the vehicle is corrected last. Next, a predetermined pair of left and right rear locate pins (5) (5)
The upward swing of the rocking table 041 and the cylinder (5a) (5
By the operation of a), it is fitted into the rear reference hole Wb, ) Ib, further improving the positioning accuracy of the vehicle body W. in this case,
In the previous proposal, the displacement of the rear part of the vehicle body becomes so large that the rear locate pin (5) may not fit into the reference hole Wb, but according to the present invention, such a problem does not occur. (Effects of the Invention) As described above, the present invention has the effect that the vehicle body can be positioned at the normal position while the inclination of the vehicle body in the vehicle length direction is suppressed as much as possible.

[Brief explanation of drawings]

FIG. 1 is a side view of a positioning device used to implement the present invention;
Figure 2 is its plan view, Figure 3 (a) (b) (c) (
d) is a line diagram showing the work process of position correction according to the present invention, and Figures 4(a), (b), (c), and (d) are diagrams showing the work process according to the prior art. Vehicle body Wa... Reference hole (4)...
・Locate pin (6)...Receiver Fig. 3 Fig. 4 (b) (d)

Claims (1)

[Claims] A pair of locating pins that can each be fitted into a pair of reference holes on both sides in the vehicle width direction on the bottom of the vehicle body and whose movement can be controlled independently of each other in the horizontal direction, and spaced apart from these reference holes on the bottom surface of the vehicle body in the vehicle length direction. After detecting the positions of these reference holes and fitting both of the locating pins into these reference holes using a positioning device equipped with a horizontally movable holder that supports the locating portion, In this method, the vehicle body is positioned at the correct position by moving both locate pins while supported by the pin and the receiver. A first step of correcting the inclination of the vehicle body in the vehicle length direction by movement, a second step of simultaneously moving both locate pins in the vehicle width direction to correct the position of the vehicle body in the vehicle width direction, and a second step of moving both locate pins in the vehicle width direction. A method for positioning a vehicle body, characterized in that the method is performed in the order of a third step of simultaneously moving the vehicle body and correcting the position of the vehicle body in the longitudinal direction.