JP2014149183A - Position inspection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of easily inspecting a position of an inspection point on a vehicle body, without using an expensive device.SOLUTION: The position inspection method includes: a step of irradiating a vehicle body 1 with reference light S from a projection direction of a two-dimensional projection drawing G of the vehicle body 1, to project information (number line L or a position of a welding spot 2') written in the two-dimensional projection drawing G to the vehicle body 1; and a step of comparing a position of the reference light S irradiated on the vehicle body 1 with a position of a welding spot 2 on the vehicle body 1, to determine whether the position of the welding spot 2 is proper or not.

Description

  The present invention relates to a method for inspecting the quality of a position of an inspection point (for example, a welding hit point) provided on an automobile body.

  An automobile body is composed of a plurality of steel plates, most of which are joined by a spot welding method. Therefore, in the assembly process of the vehicle body, the number (number) and position (position) of welded points (welding points) are confirmed, and are they consistent with the number and positions of welding points on the design drawing? It is inspected whether or not (such inspection is generally referred to as “NP inspection”).

  In general, the NP inspection of the welding spot is performed by an operator comparing the position of the welding spot on the vehicle body with the position of the welding spot described in the design drawing (two-dimensional projection drawing) of the vehicle body. . However, it is not easy to compare the position of the welding spot on the three-dimensional vehicle body with the position of the welding spot described in the two-dimensional projection drawing. Performing such work on welding points that are usually provided at 3000 or more locations on the vehicle body is very burdensome for the operator and has problems in terms of work efficiency and reliability.

  Therefore, for example, in Patent Document 1, a welding spot applied to the vehicle body is photographed by a camera, the three-dimensional position of the welding spot is recognized from this photographed image, and the recognized three-dimensional position of the welding spot is stored in advance. 1 shows an inspection apparatus that performs an inspection by checking with a three-dimensional position of a welding spot of design data.

JP 2007-152371 A

  However, the inspection apparatus as described above requires a camera that performs imaging, an arithmetic system that converts information of the captured two-dimensional image into information of the three-dimensional position of the welding point, and the cost of the apparatus increases. End up.

  The above problems occur not only in the inspection of the welding spot, but also in the case of inspecting the quality of the position of the inspection point provided on the vehicle body.

  In view of the circumstances as described above, the problem to be solved by the present invention is to provide a method for easily inspecting the position of an inspection point on an automobile body without using an expensive device.

  The present invention, which has been made to solve the above-mentioned problems, is a method for inspecting the position of an inspection point provided on an automobile body, and is applied to the automobile body from a projection direction of a two-dimensional projection drawing of the automobile body. Projecting the information described in the two-dimensional projection drawing onto the automobile body by irradiating the reference light to the automobile body, the position of the reference light irradiated onto the automobile body, and the inspection point on the automobile body And a step of determining whether the position of the inspection point is good or bad.

  As described above, according to the inspection method of the present invention, the reference light is irradiated onto the vehicle body from the projection direction of the two-dimensional projection drawing of the automobile body, whereby the information (position of inspection points, number lines, etc.) ) Can be projected onto an actual vehicle body without being converted into three-dimensional data. Thus, by comparing the position of the reference light irradiated onto the vehicle body and the position of the inspection point on the vehicle body, it can be easily determined whether or not the inspection point on the vehicle body is at a desired position.

  For example, if the slit light as the reference light is irradiated from the projection direction to the position corresponding to the number line described in the two-dimensional projection drawing, the number line is projected as the slit light on the three-dimensional body. Thereby, the quality of the position of the inspection point on the vehicle body can be determined by comparing the distance between the slit light irradiated to the vehicle body and the inspection point and the distance between the number line on the drawing and the inspection point. .

Incidentally, for example, the inspection points on the curved surface as shown in FIG. 4 when inspecting a position of (welding point 2), the distance Y between the welding point 2 on the slit light S _H and the vehicle body 1 which is irradiated to the vehicle body, It is necessary to measure in a direction orthogonal to the projection direction (that is, a two-dimensional projection drawing direction), not in a direction parallel to the surface of the vehicle body. Therefore, if the inspection light is irradiated from the projection direction to the point to be inspected on the automobile body and the measurement instrument is arranged in the direction orthogonal to the projection direction, both the slit light and the inspection light are irradiated. By reading the scale between the slit light irradiated on the instrument and the inspection light, the distance between the slit light and the inspection light in the two-dimensional projection drawing direction can be easily measured. That is, the position inspection method according to the present invention includes a step of irradiating inspection light on an inspection point on an automobile body from a projection direction, and a slit light and inspection light on a measuring instrument arranged in a direction orthogonal to the projection direction. And measuring the distance between the slit light and the inspection light, and comparing the distance measured with the measuring instrument with the distance between the number line and the point to be inspected in the two-dimensional projection drawing. Furthermore, it can be set as the structure which has.

  On the other hand, if the spot light as the reference light is directly irradiated from the projection direction to the position corresponding to the inspection point described in the two-dimensional projection drawing, the spot light is irradiated to the inspection point on the vehicle body. Whether or not the position of the inspection point is good can be determined depending on whether or not the inspection is performed, so that the inspection can be performed very easily.

  As described above, according to the present invention, the position of the inspection point on the automobile body can be easily inspected without using an expensive device.

It is a perspective view which shows the mode of the inspection method which concerns on one Embodiment of this invention. It is a block diagram of the irradiation apparatus used for the said inspection method. It is the model of the two-dimensional projection drawing of a motor vehicle body, and its enlarged view. It is the conceptual diagram which looked at the inspection method of FIG. 1 from the front. It is the conceptual diagram which looked at the inspection method concerning other embodiments from the front. It is the conceptual diagram which looked at the inspection method concerning other embodiments from the front.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  The position inspection method according to the present embodiment determines whether the positions of a plurality of inspection points (for example, welding hit points 2) applied to the automobile body 1 as shown in FIG. This position inspection method is performed using an irradiation device 3 that irradiates the automobile body 1 with reference light and a measuring instrument 8. As shown in FIG. 2, the irradiation device 3 includes an irradiation unit 4, a drive unit 5 that moves the irradiation unit 4, a detection unit 6 that detects a reference position of the vehicle body 1 (for example, the axis of the front wheel), and an irradiation unit. 4, a drive unit 5, and a control unit 7 connected to the detection unit 6. The irradiation device 3 irradiates the vehicle body 1 with reference light from the irradiator 4 based on information described in the two-dimensional projection drawing G (see FIG. 3) of the vehicle body 1. The irradiation direction of the reference light by the irradiation device 3 is the projection direction of the two-dimensional projection drawing G. For example, as shown in FIG. 3, when the two-dimensional projection drawing G is a side view, the irradiation direction of the irradiation device 3 is the vehicle width direction. In addition, when the two-dimensional projection drawing G is a top view or a bottom view, the irradiation direction of the irradiation device 3 is a vertical direction, and when the two-dimensional projection drawing G is a front view or a rear view, the irradiation of the irradiation device 3 is performed. The direction is the front-rear direction.

The irradiator 4 irradiates the linear slit light S as shown in FIG. Irradiator shown example 4 is for irradiating the cross-shaped slit beam S consisting of a horizontal slit beam S _H and the vertical direction of the slit beam S _V.

  The drive unit 5 translates the irradiator 4 in a direction orthogonal to the projection direction of the two-dimensional projection drawing G (the vehicle width direction in the present embodiment) while keeping the irradiation direction parallel to the projection direction. is there. In the present embodiment, a drive unit 5 having a mechanism for sliding the irradiator 4 in the front-rear direction of the vehicle body 1 and a mechanism for sliding the irradiator 4 in the vertical direction is used (details are not shown).

  The detection unit 6 detects the reference position of the vehicle body 1, and a contact or non-contact sensor can be used.

  The measuring instrument 8 has a light receiving surface 8 a irradiated from the irradiator 4. A scale is provided on the light receiving surface 8a.

  Hereinafter, a specific procedure for inspecting the position of the welding spot 2 on the vehicle body 1 using the irradiation device 3 will be described.

First, the detection unit 6 detects the reference position of the vehicle body 1 (for example, the axial center position of the front wheels), and information on this reference position is transmitted to the control unit 7. Then, on the drawing G, the operator selects an intersection X of the line L closest to the welding hit point 2 ′, and inputs information on the intersection X to the control unit 7. Then, the control unit 7 issues a command to the drive unit 5 to move the irradiator 4 to the same position as the intersection X with respect to the reference position on a plane orthogonal to the projection direction (vehicle width direction) of the drawing G. Then, as shown in FIG. 1, the irradiator 4 irradiates the vehicle body 1 with a cruciform slit light S (reference light), whereby the line L on the drawing G is applied to the vehicle body 1 with the slit light S (horizontal direction). It is projected as a slit beam S _V of the slit beam S _H and the vertical direction). Then, the measuring instrument 8 is arranged in the vertical direction near the welding spot 2. Thus, the light receiving surface 8a of the measuring instrument 8, the horizontal direction of the slit beam S _H is irradiated.

Then, as shown in FIG. 4, the operator measures the distance between the number line (slit light S _H ) projected on the vehicle body 1 and the welding hit point 2 of the vehicle body 1 with the measuring instrument 8. In the illustrated example, the measuring instrument 8 is set in the vertical direction, and the distance Y (height difference) between the horizontal slit light _SH and the welding spot 2 is measured. At this time, the distance Y can be measured by reading the scale having the same height as the welding spot 2 when the measuring instrument 8 is viewed from the horizontal direction. This distance Y is compared with the distance Y ′ between the number L on the drawing and the welding spot 2 ′, and the quality of the position of the welding spot 2 is determined. Specifically, if the difference between the distance Y and the distance Y ′ is within a predetermined range, it is determined that the position of the welding spot 2 is normal, and if the difference between the distance Y and the distance Y ′ exceeds a predetermined value. It is determined that the position of the welding spot 2 is abnormal.

  As described above, on the basis of the information (position of the line L) described in the two-dimensional projection drawing G, the slit light with respect to the vehicle body 1 from the projection direction (vehicle width direction in the present embodiment) of the two-dimensional projection drawing G. By irradiating S, the number L can be projected onto the three-dimensional vehicle body 1. Thereby, the position of the welding spot 2 can be easily specified without requiring a camera for shooting the welding spot 2 or an arithmetic system for converting an image shot by the camera into three-dimensional position information. By comparing the position of the welding spot 2 on the vehicle body 1 thus identified with the position of the welding spot 2 'on the drawing G, the quality of the position of the welding spot 2 can be easily determined.

  Moreover, by projecting the number L on the vehicle body 1 as described above, the position of the welding spot 2 near the number L can be inspected without moving the irradiator 4. Further, even when the vehicle type of the vehicle body 1 to be inspected is changed, it is possible to cope with the change by simply changing the reference position of the line L, so that versatility is improved.

The present invention is not limited to the above embodiment. For example, in the above-described embodiment, the distance Y is measured by reading the scale having the same height as the welding spot 2 when the measuring instrument 8 is viewed from the horizontal direction. In this case, the measurement result depends on the posture of the operator. Errors are likely to occur. Therefore, in the embodiment shown in FIG. 5, an irradiator 9 that directly irradiates the welding spot 2 is provided in addition to the irradiator 4 for projecting the wire. Like the irradiator 4, the irradiator 9 irradiates the inspection light S ₀ (for example, slit light or spot light) from the projection direction (vehicle width direction) of the drawing G, and in a direction orthogonal to the projection direction. It can be translated. In this case, the slit light _SH is irradiated from the irradiator 4 in the same manner as in the above embodiment to project the line L near the welding spot 2 onto the vehicle body 1 and the inspection of the irradiator 9 at the welding spot 2 on the vehicle body 1. It is irradiated with light S _0. In this state, by irradiating both the inspection light S ₀ of the slit beam S _H and illuminator 9 of the irradiation device 4 to the light receiving surface 8a of the measuring instrument 8 disposed in the vertical direction, a slit irradiated to the measuring instrument 8 just read the scale between the inspection light S ₀ and an optical S _H, the distance Y (height difference) between the welding point 2 and track number L can be easily measured.

In the above-described embodiment, the case where the distance Y between the horizontal slit light _SH and the welding hit point 2 is measured is shown, but instead of or in addition to this, the vertical slit light S _{V is used.} And the distance between the welding hit point 2 may be measured.

  In the embodiment shown in FIG. 6, the spot light S is irradiated as the reference light from the irradiator 4 to the position corresponding to the welding spot 2 'on the drawing G. Specifically, after detecting the reference position of the number line (for example, the axis of the front wheel) by the detection unit 6, with respect to the reference position on the plane orthogonal to the projection direction of the drawing G (the vehicle width direction in the present embodiment). The irradiator 4 is moved to the same position as the welding spot 2 ′. Then, by irradiating the vehicle body 1 with the spot light S from the irradiator 4, the position where the welding spot 2 should be is projected onto the vehicle body 1. By comparing the irradiation position of the spot light S with the position of the welding spot 2, the quality of the position of the welding spot 2 can be determined. That is, as shown in FIG. 6 (a), if spot light S is irradiated on the welding spot 2 of the vehicle body 1, it is determined that the position of the welding spot 2 is normal, and from the welding spot 2 of the vehicle body 1. If the irradiation position of the spot light S is shifted, it can be determined that the position of the welding spot 2 is abnormal. In this case, since the measurement work by the measuring instrument 8 is not required, the burden on the operator is greatly reduced.

  Moreover, although the case where the position of the welding hit point was inspected as an inspection point was shown in the above embodiment, the present invention is not limited to this, and other inspection points provided on the vehicle body 1 (for example, machining holes). It can also be applied to the inspection of the quality of the position.

DESCRIPTION OF SYMBOLS 1 Automobile body 2 Welding spot 3 Irradiation device 4 Irradiator 5 Drive part 6 Detection part 7 Control part 8 Measuring instrument 9 Irradiator G Two-dimensional projection drawing L Number line S Reference light (slit light, spot light)
S ₀ inspection light

Claims (3)

A method for inspecting the position of an inspection point provided on an automobile body,
Projecting information described in the two-dimensional projection drawing onto the automobile body by irradiating the automobile body with reference light from a projection direction of the two-dimensional projection drawing of the automobile body; A position inspection method comprising a step of comparing the position of the irradiated reference light and the position of the inspection point on the vehicle body to determine the quality of the position of the inspection point.   The position inspection method according to claim 1, wherein a slit light as a reference light is irradiated on the vehicle body from the projection direction at a position corresponding to a number line described in the two-dimensional projection drawing.   A step of irradiating inspection light on the inspection point on the automobile body from the projection direction, and a state in which both the slit light and the inspection light are irradiated to a measuring instrument arranged in a direction orthogonal to the projection direction And measuring the distance between the slit light and the inspection light, and comparing the distance measured by the measuring instrument with the distance between the number line and the point to be inspected in the two-dimensional projection drawing. Item 3. The position inspection method according to Item 2.

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