JPH0262001B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to the positioning of a reference point for a coordinate measuring machine used to locate a measurement reference point when measuring the accuracy of an automobile body, etc. Regarding the extraction jig.

There is a three-dimensional measuring machine as a device for measuring the manufacturing accuracy of automobile bodies and the like. When using this measuring device to measure the accuracy of a car's body, for example, from the measurement reference point set on the surface plate in the width direction of the car body (X direction), the longitudinal direction of the car body (Y direction), and the height direction of the car body ( The distance from the measurement reference point is measured in three directions (Z direction) using the measuring needle of the measuring device, and therefore it is necessary to zero-adjust the measuring needle of the measuring device at the measurement reference point.

Conventionally, when locating the measurement reference point, as shown in Fig. 6, in the X direction and the Y direction,
This is done by fitting two parallel keys 53 and 54 into the grooves 50 and 51 at predetermined positions on a surface plate 52 in which grid-like grooves 50 and 51 are formed in the vertical and horizontal directions, and a height gauge is used for the Z direction. 55 were in use. Then, the measuring needle 57 of the coordinate measuring machine 56 is brought into contact with the surface of the parallel key 53 facing the X direction to zero-adjust the display device. 57 was brought into contact with it to perform zero adjustment. Therefore, conventionally, the X direction, Y direction, Z direction
It was necessary to determine the position of the measurement reference point separately for each direction, and to perform zero adjustment of the measuring needle 57 separately for each reference point. This requires a lot of work and cannot be done efficiently.Especially when measuring the body of a car, eight reference points are set, and just locating the reference points requires a lot of work. The problem was that it was time consuming. In addition, since the reference points in the X and Y directions must be positioned below, the measuring needle must be lowered to a lower position, which may make work difficult or visually check the contact of the measuring needle at a lower position. There were also problems with workability, such as fatigue in the lower back.

(Object of the invention) The present invention has been made to solve such conventional problems, and its purpose is to
This is a reference point for a coordinate measuring machine that can simultaneously locate measurement reference points in three directions (direction, Y direction, Z direction, three-dimensional direction) at one point, and only needs to zero-adjust the measuring needle once. The purpose of the present invention is to provide a positioning jig.

(Structure of the Invention) That is, in order to achieve this object, the positioning jig of the present invention includes: a base that is detachable from the surface plate; an outer holder that is erected on the base; an inner holder inserted with an adjustment gap maintained therein; an upper part serving as a positioning part, a lower part serving as an adjusting part, and the adjusting part is rotatably and slidably fitted into the inner holder; and a positioning pin; and the positioning portion of the positioning pin is provided with a downward reference point on the rotation center of the upper surface, and a verticality side constant surface and a notch surface are formed on the side surface. The cutout surface is provided with an upward reference point located on an axis passing through the downward reference point, and the outer holder is provided with a vertical adjustment mechanism and a vertical adjustment mechanism for the positioning pin.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. First, the configuration of the positioning jig of this embodiment will be explained with reference to FIGS. 1 to 4.

The positioning jig A of this embodiment includes a base 1, an outer holder 2, an inner holder 3, and a positioning pin (hereinafter referred to as pin) 4.

The base 1 includes a main body 6 having a recess 5 formed on the bottom surface, and a magnet 7 fitted into the recess 5.
and a lattice-shaped groove 11 formed in the surface plate 10, fixed by screws 9 in a state protruding from the bottom surface into key grooves 8, 8 formed in the orthogonal direction on the bottom surface,
Keys 12, 12 are removably fitted into 11.
It consists of and.

Next, the outer holder 2 is vertically installed on the upper surface of the base 1, and has holding holes 13 for the inner holder 3 inside.
is formed, and a stepped portion 1 is formed on the bottom surface of the holding hole 13.
4 is formed, and vertical adjustment screws 15 and 16, which serve as vertical adjustment mechanisms, are provided at four locations on the front, rear, left, and right sides, respectively, at the bottom and top of the outer periphery, and at the bottom of the lower adjustment screw 15, there are vertical adjustment mechanisms. Vertical adjustment screws 17 serving as a mechanism are provided at four locations on the front, back, left and right, facing the axis. In addition, each of the vertical adjustment screws 1
The tip surfaces of 5 and 16 are formed into hemispherical surfaces 18 and 19, and the tip surface of the vertical adjustment screw 17 is formed into a tapered surface 1.
9 is formed.

In addition, the inner holder 3 has a fitting hole 2 for the pin 4 inside.
0 is formed, and the holding hole 13 of the outer holder 2
The lower end is inserted into the inner holder with the lower end supported by the stepped portion 14, and in the inserted state, an adjustment gap 21 is formed between the inner circumferential surface of the holding hole 13 and the outer circumferential surface of the inner holder 3.
are formed, and grooves 22, 22 each having an arcuate cross section are formed in the horizontal direction on the outer circumferential surface at positions corresponding to the vertical adjustment screws 15, 16, respectively.

The pin 4 is formed in a cylindrical shape and is attached to the inner holder 3.
It is rotatably and slidably fitted into the fitting hole 20 with the lower end supported by the vertical adjustment screw 17, and the lower part serving as the fitting part is an adjustment part 23, Further, the upper part protruding from the fitting hole 20 is formed as a positioning part 24, and the lower end is formed with an inclined surface 25 that matches the tapered surface 19 of the vertical adjustment screw 17. A downward reference point 26 is provided at the center of rotation, and the outer circumferential side is used as a perpendicularity measurement surface 27, and a cutout surface 28 is formed on the outer circumferential side.
An upward reference point 30 is provided on the cutout surface 28 on an axis 29 passing through the downward reference point 26 . The downward reference point 26 is the intersection point of the step 31 formed on the diameter of the pin 4 and the ultra-thin groove 32 on the diameter perpendicular to the step 31, and the upward reference point 30 is the intersection point of the step 31 formed on the diameter of the pin 4. This is the intersection of the extremely thin grooves 33 and 34 formed in the horizontal direction.

In addition, 35 is a handle for carrying, and the outer holder 2
installed on. Also, 40 is a coordinate measuring machine B
It is a measuring needle.

Next, a method for adjusting the positioning jig A of this embodiment will be explained with reference to FIG.

First, the positioning jig A and the coordinate measuring machine B are set on the surface plate 10. Note that the positioning jig A uses keys 12, 12 in the orthogonal direction provided on the base 1 to
The keys 12 and 12 are set by fitting them into the grooves 11 and 11 of 0, but in this case, both keys 12 and 12 are restricted from moving in the front, back, left and right directions, and are fixed in that position.

Then, a dial gauge D is attached to the layout machine B, and the difference between the R point and the S point is read while moving the dial gauge D vertically in parallel on the perpendicularity measuring surface 27 of the pin 4. Next, adjust the difference between the R point and the S point with the vertical adjustment screws 15x and 15x at the bottom to make the X-X direction vertical, and use the same procedure to adjust the Y-Y direction vertically with the vertical adjustment screws 15y and 15y. If you let it out, pin 4 will stand vertically.

To move the pin 4 in parallel in the X-X direction, turn the lower vertical adjustment screws 15x and 15x the same number of rotations, and turn the upper vertical adjustment screw 16
Similarly, you only need to turn x and 16x by the same number of rotations.
Further, parallel movement in the Y-Y direction is similarly performed using the lower vertical adjusting screws 15y, 15y and the upper vertical adjusting screws 16y, 16y.

Moreover, when adjusting the height of point T, it is sufficient to turn any one of the vertical adjustment screws 17z.

Then, X-X, Y, which will finally become the measurement reference point
-Y, Z-Z intersections are checked at R, S, and T points.

Therefore, when the positioning jig A of this embodiment is used, the three-dimensional directions of the The measurement reference point in the direction and the Z direction is positioned at one location, and the downward reference point 26 and upward reference point 30 are provided, so the measuring needle 40 can be used either downward or upward. Furthermore, since the base 1 can be attached to and detached from the surface plate 10, it can be moved, and even if the pin 4 rotates, the positions of the reference points 26 and 30 will not shift. Since the position is higher than the surface plate 10, the work can be done easily.

Although one embodiment of the present invention has been described above with reference to the drawings, the specific configuration of the present invention is not limited to the above-described embodiment.

For example, in this embodiment, the vertical adjustment screws 17 are provided at four locations on the front, back, left, and right, so that the height can be adjusted using the vertical adjustment screws 17 at positions that are easy for the operator to adjust. good.

As explained above, according to the present invention, the following effects are achieved.

B The inclination of the positioning pin can be adjusted perpendicularly to the surface plate by operating the vertical adjustment mechanism, and the reference point can be adjusted to a predetermined height by operating the vertical adjustment mechanism. The reference point of the tool is positioned in three dimensions.

(b) By making the base removable from the surface plate, the adjusted positioning jig can be moved closer to the measurement site, reducing the number of measurement steps. Furthermore, the number of man-hours required for positioning and adjusting the reference point can be reduced.

C. By providing an upward reference point and a downward reference point, the measuring needle can be brought into contact with the reference points while facing upward or downward, making the work easier.

D. By providing the reference point at the center of rotation of the positioning pin, the three-dimensional position of the reference point does not change even if the positioning pin is rotated, so there is no need to attach or remove a jig.

E. Since the positioning part of the positioning pin can be positioned above the surface plate, work can be done without lowering the measuring needle to a low position, improving work efficiency.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a positioning jig according to an embodiment of the present invention, Fig. 2 is a bottom view of the base, Fig. 3 is a plan view showing a reference point for downward direction, and Fig. 4 shows a reference point for upward direction. FIG. 5 is a front view, FIG. 5 is a perspective view for explaining a method of adjusting the positioning jig, and FIG. 6 is a perspective view showing a conventional positioning state. 1... Base, 2... Outer holder, 3... Inner holder, 4... Positioning pin (pin), 10... Surface plate,
15... Vertical adjustment screw (vertical adjustment mechanism), 16...
... Vertical adjustment screw (vertical adjustment mechanism), 17 ... Vertical adjustment screw (vertical adjustment mechanism), 21 ... Adjustment gap,
23... Adjustment section, 24... Positioning section, 26...
Reference point for downward direction, 27... Verticality measurement surface, 28...
... Notch surface, 29 ... Axis line, 30 ... Reference point for upward direction, A ... Positioning jig, B ... Three-dimensional measuring machine.

Claims (1)

[Claims] 1 A base that is detachable from the surface plate; An outer holder that is erected on the base; An inner holder that is inserted into the outer holder while maintaining an adjustment gap; The upper part is used as a positioning part. , the lower part is the adjustment part,
The adjusting portion includes a positioning pin rotatably and slidably fitted to the inner holder, and the positioning portion of the positioning pin is provided with a downward reference point on the rotation center of the upper surface. At the same time, a verticality side surface and a cutout surface are formed on the side surface, and an upward reference point located on the axis passing through the downward reference point is provided on the cutout surface, and a positioning pin is provided on the outer holder. A reference point positioning jig for a three-dimensional measuring machine, characterized in that it is provided with a vertical adjustment mechanism and a vertical adjustment mechanism.