JPH0758185B2 - Three-dimensional measuring device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-dimensional measuring device for measuring the dimensions of a three-dimensionally measured object represented by a vehicle body panel of an automobile.

2. Description of the Related Art A three-dimensional measuring device of this type is disclosed in, for example, Japanese Patent Laid-Open No. 62-2325
There is one disclosed in Japanese Patent Application Laid-Open No. 09-28242 and Japanese Patent Application Laid-Open No. 62-242811. In these measuring devices, for example, as shown in FIG. 7 and FIG.
Work Wa based on support plate 83 and locate pin 84 of 82
After positioning, the measurement sensor 86 supported by the measurement robot 85 basically measures the shape and dimension of the work Wa.

In the above structure, although the work Wa is positioned by the support plate 83 and the locate pin 84, the work support surface of the support plate 83 is a simple horizontal surface, for example, the work Wa
It is difficult to stably support the work Wa when the inclined surface has an inclined surface, and a dedicated positioning jig for supporting the inclined surface is required separately. As a result, when there are many types of workpieces to be measured, the number of positioning jigs 82 increases accordingly, and the management of positioning jigs becomes complicated.

The present invention has been made in view of the above problems,
It is an object of the invention to provide a versatile structure that can stably support a workpiece regardless of its shape.

Means for Solving the Problems The present invention measures a dimension of an object to be measured by a sensor head of the measuring mother machine after positioning the object to be measured with reference to a plurality of fixture units placed on a surface plate of the measuring mother machine. In the device, the fixture unit includes three spherical support members that form a virtual support plane for supporting the object to be measured, and the support members are individually moved up and down in accordance with the shape of the object to be measured. And a height adjusting mechanism for adjusting

Action According to this structure, since the three support members are spherical, the height of each support member is adjusted by the height adjusting mechanism, so that any virtual support plane regardless of whether it is horizontal or inclined. Can be created. As a result, it becomes possible to stably support an object to be measured of any shape.

Embodiment FIG. 1 to FIG. 4 are configuration explanatory views showing an embodiment of the measuring apparatus of the present invention, and as shown in FIG. 3 and FIG. , Surface plate 2, column 3 movable on surface plate 2 in the X direction, and Y with respect to column 3
Carrier 4 movable in any direction and Z with respect to carrier 4
And an arm 5 movable in a direction. The column 3 is moved in each axial direction by the action of a servo motor and a ball screw 9 not shown, and the carrier 4 and the arm 5 are moved in the respective axial directions by the action of the servo motors 7, 8 and ball screws 6, 10. 1
1,12 are rails.

On the surface plate 2, a plurality of fixture units 13, 13 having different heights for positioning a workpiece (a vehicle body panel of an automobile is illustrated in this embodiment) W as a measured object.
Besides, the sensor head 14 is attached to one side surface of the arm 5, and the sensor head 14 can swivel in the α and β directions. Orthogonal 3 in the X, Y, Z directions of
In addition to the degrees of freedom of the axes, the degrees of freedom of the two rotations of α and β are added to give a total of five degrees of freedom.

As shown in FIGS. 1 and 2, the fixture unit 13 has a housing 15, three shafts 16 inserted into and supported by the housing 15, and a spherical member as a support member attached to the tip of each shaft 16. A magnet chuck (not shown) is mounted on the bottom surface of the housing 15, and the fixture unit 13 is attracted and fixed to a predetermined position on the surface plate 2 by the function of the magnet chuck.

A spline shaft portion 16a is formed in an upper half portion of each shaft 16, and a screw shaft portion 16b forming a ball screw 23 together with a nut member 20 described later is formed in a lower half portion thereof. The spline shaft portion 16a is ball-spline-coupled to the bush 18 on the housing 15 side, which prevents the shaft 16 from rotating and allows only vertical movement.

As shown in FIG. 1, around each shaft 16, an electromagnetic brake 19, a nut member 20, an electromagnetic clutch 21, and a driven gear are provided.
22 are provided. The nut member 20 is rotatably supported by the housing 15 via a bearing 20a, and
A ball screw 23 is formed by being screwed into a screw shaft portion 16b of the shaft 16, and a brake disc 24 and a disc plate of an electromagnetic clutch 21 are provided to the nut member 20.
25 are connected together. The driven gear 22 is rotatably supported by the housing 15 via a bearing 26 and is integrally connected to the clutch disc 27. The driven gear 22 is connected to the drive gear 29 on the motor 28 side shared by the shafts 16. It is in mesh. Then, the motor 28, driven gear 29, driven gear 22, ball screw 2
3, each gauge 1 by electromagnetic brake 19, electromagnetic clutch 21 etc.
A height adjusting mechanism 30 for adjusting the height of 7 is configured. 31 and 32 are coils.

That is, when the braking state of the electromagnetic brake 19 corresponding to the gauge 17 whose height is to be adjusted is released and the corresponding electromagnetic clutch 21 is operated to rotate the motor 28,
The rotation torque of the driven gear 22 is transmitted to the nut member 20 via the clutch disc 27 and the disc plate 25 of the electromagnetic clutch 21, and the nut member 20 rotates to move the shaft 16 up and down to adjust the height of the gauge 17. Will be done.

Next, the operation of the measuring device configured as described above will be described.

First, as shown in FIGS. 3 and 4, a plurality of fixture units 13 are provided according to the shape of the workpiece W to be measured.
Is fixed at a predetermined position on the surface plate 2. Then, the height of the gauge 17 is adjusted for each of the fixture units 13. In this height adjustment work, since the three gauges 17 of the fixture unit 13 share one motor 28 as described above, the electromagnetic brake 19 and the electromagnetic clutch 21 which are independent of each shaft 16 are selectively operated. Then, the height of each gauge 17 is adjusted individually.

When the height adjustments of the gauges 17 of all the fixture units 13 are completed, the work W is set on the fixture units 13. At this time, since the height of each gauge 17 is adjusted in advance according to the shape of the work W, the virtual support plane a (the first gauge) for supporting the work W by the three gauges 17 of each fixture unit 13 is used. 2) is formed and these virtual support planes a
The work W is supported in a predetermined manner.

Subsequently, when the type data of the work W is input to the control panel (not shown) together with the measurement start signal, the control panel is required to move the sensor head 14 according to the type of the work W, and the trajectory data, Since the measurement reference data assuming that the work W is finished according to the design data is input in advance, the data corresponding to the type of the work W to be measured is called. Then, the sensor head 14 moves along the designated path to measure the shape and dimension of the work W, and the control panel side compares the measurement data with the measurement reference data, and displays the measurement result on the graphic display, for example. Along with that, plot with an XY plotter.

When the measurement is completed, the sensor head 14 moves to the arm 5 of the measuring mother machine 1.
Each work is returned to the origin position, and the work W is removed from the surface plate 2 to complete a series of operations.

Here, depending on the shape of the work W, the fixture unit 13 having the three gauges 17 and the fixture unit having only one gauge may be used together. Further, the motor 28 of the height adjusting mechanism 30 may be provided independently for each gauge 17.

In the embodiment shown in FIG. 5, a magnet 17 having a suction block 40 and a coil 41 is spherically coupled to the gauge 17 so as to be tiltable. In this example,
Since the magnet chuck 42 is tilted and displaced according to the shape of the work W, and the work W is attracted and clamped, there is an advantage that the support state of the work W is further stabilized.

The embodiment shown in FIG. 6 uses a vacuum cup 51 in place of the magnet chuck 42. That is, the bearing member 52 is spherically coupled to the gauge 57 so as to be capable of tilting displacement, and the vacuum cup 55 integral with the holder 54 is attached to the bearing member 52 via the compression coil spring 53. By sucking the air in the vacuum cup 55, the work W is sucked and clamped by its negative pressure suction action. Reference numeral 58 is a seal member.

Also in the case of this embodiment, the same effect as that of the second embodiment can be obtained.

EFFECTS OF THE INVENTION As described above, according to the present invention, a fixture unit that supports an object to be measured has three spherical support members that form a virtual support plane that supports the object to be measured, and the support members to be measured. Since the height adjusting mechanism adjusts the height by individually moving up and down according to the shape of the object, the three support members allow an arbitrary virtual support plane according to the shape of the object to be measured. The fixture unit itself can be generalized, and the object to be measured can be stably supported regardless of the shape of the object to be measured. Further, since the fixture unit is generalized as described above, the number of required fixture units can be minimized, and the number of fixture unit management steps can be significantly reduced.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of a measuring device of the present invention, an enlarged sectional view of a fixture unit, FIG. 2 is a perspective view of the fixture unit, and FIG. FIG. 4 is an explanatory plan view of a surface plate, FIG. 5 is an enlarged explanatory view of a gauge showing a second embodiment of the present invention, and FIG. 6 is an enlarged view of a gauge showing a third embodiment of the present invention. Explanatory drawing, No. 7
FIG. 8 is a configuration explanatory view showing an example of a conventional measuring apparatus, and FIG. 8 is a perspective view of a positioning jig used in the conventional measuring apparatus. 1 …… Measuring mother machine, 2 …… Surface plate, 13 …… Fixture unit, 14 …… Sensor head, 17 …… Gauge, 23 …… Ball screw, 19 …… Electromagnetic brake, 21 …… Electromagnetic clutch, 28
...... Motor, 30 …… Height adjustment mechanism, W …… Work, a…
… Virtual support plane.

Claims (1)

[Claims] 1. An apparatus for measuring a dimension of an object to be measured by a sensor head of the measuring mother machine after positioning the object to be measured with reference to a plurality of fixture units placed on a surface plate of the measuring mother machine. The cha unit includes three spherical support members that form a virtual support plane for supporting the object to be measured, and height adjustments for individually moving the supporting members up and down according to the shape of the object to be adjusted. A three-dimensional measuring device comprising a mechanism.