JPS6014101A - Measuring method of working shape of object to be worked - Google Patents

Abstract

PURPOSE:To simplify teaching and measurement by storing the length between a displacement meter sensor and a shape primary standard in a relative measurement reference position at a teaching time and performing a relative measurement in consideration of this length when an object to be measured is measured. CONSTITUTION:A probe 8 incorporating the displacement meter sensor is provided at the tip of an arm 5 of a measuring arm mechanism 4. At a teaching time, the probe 8 is allowed to face measuring points, which are provided on a surface 10 of a shape primary standard 1, with a proper length between them from the direction of the normal of this surface 10, and then, the length is measured and is stored together with positions of measuring points. At a measurement time, the shape primary standard 1 is replaced with the object to be measured, and the probe 8 is allowed to face each measuring point from the direction of the normal of the surface 10 similarly, and the length is measured. The measured length is compared with the length, which is stored at the teaching time, to obtain a relative dimension difference.

Description

Detailed Description of the Invention (Field of Industrial Application) Paper shape prototype of the present invention and workpiece (processing of workpiece tτIS
It's called a minute. The present invention relates to a method for measuring the processed shape of a workpiece, which measures relative shape-comparative dimensions of the workpiece (the same applies hereinafter).

(Prior art) The dimensional accuracy of curved pressed panels used in automobiles, etc. and their assembled products is measured using a three-dimensional shape measuring machine.
Is going.

Conventionally, when measuring the shape comparison dimensions of a shape prototype and a measured object, measurements are continuously made along the curved surface thereof. In this case, there is a problem in that the distance between the shape prototype and the displacement needle sensor cannot always be kept constant at any measurement point. For this reason, skill is required to memorize the shape of the shape prototype (hereinafter referred to as "teaching man-hours"), and when the shape is used for a long period of time, V and cavities become rough.

(Object of the Invention) The present invention was invented in order to solve the problems of the prior art described above, and it is possible to perform teaching without accurately maintaining the distance between the pumping sensor and the shape prototype. In this way 1
It is an object of the present invention to provide a method for measuring the machined shape of a workpiece, which allows the work to be performed.

(Redundant structure) In order to achieve the second object, the present invention
Displacement meter Senzu 1'6iA 7! ! ', the distance of the shape Jt+ from the device to the displacement side SENTU 1 in the direction of the ifn fine slope surface, and the shape prototype and the measured object t twisted by 115.
Illusion LAil dill '7 Measuring the distance between the measured object and Kui Senzu on the 1st point) 1H degree reproduction 7, convex! l j+LJFV 1eft＼Relative to the shape standard of the object to be measured = J method difference?
In the step of writing down the exact distance calculation 1 from the step of finding it, ! R'U', j: 17 so that the distance between the I sensor and the shape prototype does not have to be maintained at a constant value, and the number of teaching operations can be reduced by one.

(Example) ``One embodiment of the present invention using Figures 1 to 3 below''
Explain.

1 tj, a shape IM device, which is removably mounted on a base 3 fixed to a table 2.

Reference numeral 4 denotes a measurement arm and arm mechanism, which consists of arms 5, 6, and 7 blue, each having I'A'rJ+J-type six-axis degrees of freedom. The regular arm machine 4 for d moves in the A direction in response to an operation signal transmitted from a control panel (not shown). It is still rotated about axis B by operating the rotary arm. A probe 8 equipped with a displacement sensor is installed at the tip of the arm 5, and this probe 8 moves from surface 10 or d of the shape prototype 1 to the surface 10 or d of the object to be measured 11 (the It faces the measurement point on plane 12 (see Figure 3).

The teaching process will now be explained.

rkJlo of shape yA device 1 has predetermined measurement points) 13.1'4, 15. ...... will be established.

Place the displacement side sensor at each measurement point 13, 14, 15°.
.

After the teaching process is completed, the shape prototype 1 is transferred to the object to be measured 1.
1, and performs a step of automatically calculating the relative dimensional difference between the object to be measured 11 and the shape prototype 1.

Each measurement point 13, 14, 15, . . . of the shape prototype 1 is determined based on the information stored during the teaching.
(Each measurement point of the object to be measured 11 that corresponds relatively to...)
16.17,18. Compare ・-・・・The measurement reference position is well expressed at and measure the distance. The measured distance is compared with the distance stored during the teaching to determine the relative dimensional difference.

Next, another embodiment of the method of the present invention for measuring the deviation of the large cry IA will be described.

Reference numeral 19 in FIG. 4 is a measurement terminal, which is attached to the displacement sensor. The lower part 20 of this measurement terminal 19
is provided with a taper 21, and a bin 22 extending from the tapered portion 21 of and coincident with its axis.

When teaching the reference hole 23 shown in FIG. 5, it is difficult to insert the pin 22 of the measurement terminal 19 into the center O of the reference hole 23 shown in FIG.

Assume that during this teaching, the pin 22 of the measurement terminal 19 is inserted at a point K which is offset from the center O of the reference hole 23 in the X direction and by a distance ty in the 'x a '/direction. At this time, the measuring terminal 19 detects the deviations 1X and 1y of the point K from the center O by the tapered portion 21. Compare point K to measurement reference position v
, (the position to be reproduced when measuring the object to be measured) is 1.0
shi, still memorize the deviations 1X and 1y from the center O.

When measuring the position of the hole 24 of the object to be measured 11, the point 1 (memorized during the teaching) is reproduced as a comparison measurement reference position.The measurement terminal 19 is inserted into the hole 24 of the object to be measured 11. .

At this time, the bottle 22 may be inserted from any position in the hole 24. ) With the tapered portion 21 of the measurement terminal 19 fitted into the hole 24, the center O' of the hole 24 is measured as L'> and L'A with respect to the reference measurement reference position. The deviation between the hole 24 of the object to be measured 11 and the above-mentioned upper hole 23 is the deviation t' determined by K Rt: ti during the teaching.
x, t'y, the center o', the relationship between o is the deviation t' in the X direction -ty.

The deviation in the y direction is calculated as ty'Q.

In this way, when measuring the displacement of the hole position, the displacement can be measured without inserting the pin 22 of the differential terminal 19 into the center of the hole.

(Effect of the invention l(',,) As mentioned above, the measuring force method of the present invention memorizes the distance between the displacement meter sensor and the shape prototype at a fixed reference position, and measures the measured object. Since comparative measurements can sometimes be performed taking into account the comparison measurement reference distance 11, no skill is required for measurement and the number of teaching hours can be reduced.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing an example of the teaching process according to the method of the present invention, FIG. 2 is an enlarged cross-sectional view showing a part of the first part, and FIG. 4 is a cross-sectional view showing the process of measuring the object to be measured. FIG. 4 is a 4111-plane view showing an example of the structure of a measurement terminal used for hole position measurement in another embodiment of the present invention. FIG. 5 is an explanatory diagram showing an example of calculating a hole position shift. 1... Shape standard 11... Measured object 13.14, 15... Measurement button 16.17
, 18...Reproduced measurement point %t+Ii
Applicant: Toyota Motor Corporation (and 1 other person) Fang 1, Fang 2, Fang 3, Fig. 41 O, Yo

Claims (1)

[Claims] (1) A step in which a displacement meter sensor faces the shape prototype at a predetermined measurement point, and the exact distance in the surface normal direction from the shape prototype to the displacement meter sensor is memorized;
With respect to the workpiece replaced with the shape prototype, the distance measurement between the workpiece and the displacement sensor at the measurement point is accurately reproduced, and the measured value is stored as the stop distance.
A method for measuring the machined shape of a workpiece, comprising the step of determining the relative dimensional difference between the shape prototype of the machined part of the workpiece and the shape prototype of the machined part of the workpiece.