JPH0385407A - Inspecting apparatus of internal shape - Google Patents

Abstract

PURPOSE:To enable highly-precise and efficient inspection of the quality of a connector by bringing a contactor of a shape signal generator into contact with a seat part of the connector in a condition wherein the connector is rotated by a motor for rotation. CONSTITUTION:In a condition wherein a connector 1 is rotated by a motor 7 for rotation, a contactor of a shape signal generator 25 is brought into contact with a seat part 2 of the connector 1. The generator 25 is moved by a motor 13 for feed so that it is made to approach or separated from the connector 1, and the contactor thereof is displaced in accordance with the shape of the seat part 2. At this time, the generator 25 generates signals corresponding to the shape of the seat part 2, while a measuring means measures the surface precision and the dimensions of the seat part 2 on the basis of these shape signals. By turning the shape of the seat part 2 into the electric signals, accordingly, the quality of the connector 1 can be inspected highly precisely and efficiently.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applicable to the inspection of a part to be inspected provided inside a workpiece, such as a seat part protruding inside the mouthpiece of an automobile fuel hose. The present invention relates to an internal shape inspection device that inspects the shape.

[Prior Art] Conventionally, Japanese Patent Application Laid-Open No. 58-190707 discloses a method in which a slit-shaped parallel light beam is projected onto the surface of a workpiece, an image of the parallel light beam is photographed with a television camera, and the surface of the part to be inspected is A surface inspection method for testing accuracy is disclosed. However, although this conventional technique is suitable for inspecting the shape of a part to be inspected provided outside the workpiece, for example,
This method is inappropriate for inspecting a seat portion 2 protruding from the interior of a cap 1 of an automobile fuel hose as shown in FIG. This is because, since the seat portion 2 of the cap 1 is located at the back, the slit light is diffusely reflected internally due to the angle of the sheet surface 3 of the seat portion 2, making accurate measurement impossible. Therefore, the current situation is that a workpiece in which a portion to be inspected is provided has been manually inspected.

[Problems to be solved by the invention] However, in the case of manual inspection, not only does inspection efficiency decrease, but also variations in inspection accuracy occur due to the inspector's subjectivity, and flaws or dimensional defects may be overlooked. Due to this, such workpieces were found to be defective in the final inspection when they were commercialized.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an internal shape inspection apparatus that can efficiently and highly accurately inspect a workpiece in which a portion to be inspected is provided.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the internal shape inspection apparatus of the present invention includes a rotating means for rotating a workpiece having a part to be inspected therein, and a rotation means for rotating a workpiece having a part to be inspected therein; shape signal generating means for generating a signal corresponding to the shape of the part to be inspected based on contact between the part and the contact; and movement for moving at least one of the shape signal generating means or the work toward and away from the other. and a measuring means for measuring the surface accuracy and dimensions of the part to be inspected based on the signal from the shape signal generating means.

[Operation] In the internal shape inspection apparatus of the present invention, the contact of the shape signal generating means is brought into contact with the inspected portion of the workpiece while the workpiece is being rotated by the rotating means.

The shape signal generating means is moved toward or away from the work by the moving means, and its contacts are displaced to follow the shape of the part to be inspected. At this time, the shape signal generating means generates a signal corresponding to the shape of the part to be inspected, and the measuring means measures the surface accuracy and dimensions of the part to be inspected based on the shape signal. Therefore, by converting the shape of the part to be inspected into an electrical signal, it is possible to efficiently (inspect) the quality of the workpiece with high accuracy.

[Example] Hereinafter, an example embodying the present invention will be described based on the drawings.

1 to 5 show an embodiment of an internal shape inspection device according to the present invention, FIG. 1 is a front view showing the whole, and FIG. 2 is a partial front view showing an enlarged shape signal generator and a workpiece. , FIG. 3 is an explanatory diagram showing the relationship between the shape signal generator and the workpiece in different states, FIG. 4 is a block diagram showing the electric circuit, and FIG. 5 is a flow chart explaining the operation.

First, to explain the shape of the workpiece to be inspected, FIG. 2 shows a metal cap 1 that is attached to the end of an automobile fuel hose (not shown). Inside the cap 1, a sheet portion 2 serving as a portion to be inspected is provided in a protruding truncated conical shape. The seat portion 2 is formed with a seat surface 3 on which a mouthpiece of another hose (not shown) is seated, and a fluid passage 4. In order to prevent fluid leakage in the connected state, high precision is usually required for the surface precision of the seat surface 3 and the height h of the seat portion 2.

Next, an explanation will be given of the internal shape inspection device of this embodiment for inspecting the shape of the seat portion 2 of the base 1 described above. As shown in FIG. 1, a rotation motor 7 is installed on a substrate 6 of the internal shape inspection device, and a chuck 8 is connected to a rotation shaft (not shown) of the rotation motor 7. The cap 1 is removably gripped by a plurality of gripping claws 9 of the chuck 8.

In this state, the base 1 is rotated around one vertical axis as the rotation motor 7 rotates.

A stand 11 is provided on the substrate 6 adjacent to the rotation motor 7.
is erected, and a holder 1 is placed on the top of the stand 11.
A feed motor 13 and a screw shaft 14 are each supported in an inclined manner via 2.

A kitchen rear 15 is attached to the threaded shaft 14 with its threaded cylindrical portion 16.
are screwed together. A support portion 17 and an adjustment portion 18 are protruded from the upper surface of the carrier 15, and an arm 19 is supported by the support portion 17 via a support shaft 20 so as to be swingable around a horizontal axis. An air cylinder 21 is installed on the carrier 15 so as to urge one arm clockwise in FIG. 1. Further, a pair of adjustment bolts 22 and 23 are screwed into the adjustment portion 18 to restrict the swinging position of one arm in both directions.

A shape signal generator 2 is provided at the lower end and side surface of the arm 19.
5 is attached to the base 1 so as to face diagonally from above. This shape signal generator 25, as shown in FIG.
It has an armature 26 that enters into the interior of the base 1, and a contact 27 made of diamond or the like that comes into contact with the seat surface 3 of the seat portion 2 is disposed at the tip of the armature 26. Further, the shape signal generator 25 has a built-in piezoelectric element 28 (see FIG. 4), and generates a signal corresponding to the unevenness of the seat surface 3 as the armature 26 moves.

Subsequently, the electric circuit of the internal shape inspection device of this example was
This will be explained according to the diagram. The piezoelectric element 28 of the shape signal generator 25 is connected to a microcomputer (CPU: 30) that controls the entire internal shape inspection device, and a flaw signal processing circuit 31.
connected via. This flaw signal processing circuit 31 is
Bypass filter 32, amplifier circuit 33, full wave rectifier circuit 3
4, amplifier circuit 35, A/D converter 36, sensitivity setting device 37
, a peak hold circuit 38, and an A/D converter 39. The maximum value of the signals output by the piezoelectric element 28 of the shape signal generator 25 is held in the peak hold circuit 38. In addition, the microcomputer 30 and the contact 2 of the shape signal generator 25
A contact signal processing circuit 40 is connected between the contact signal processing circuit 7 and the contact signal processing circuit 7.

The contact signal processing circuit 40 includes a buffer 41, a low level peak hold circuit 42, and an A/D converter 43.

On the other hand, the rotation motor 7 is connected to the output side of the microcomputer 30 via a motor drive circuit 44.
The feed motor 13 is connected via a motor drive circuit 45, and the air cylinder 21 is connected via a valve drive circuit 46. Further, the microcomputer 30 is connected to a surface accuracy display section 47 that displays the surface accuracy of the seat surface 3 of the cap 1 and a dimension display section 48 that displays the height h of the seat section 2 of the cap 1. .

Next, the operation of the internal shape inspection apparatus of this embodiment configured as described above will be explained with reference to the flowchart shown in FIG.

Now, when the start switch (path shown) is turned on with the cap 1 to be inspected set in the chuck 8, initial settings of the memory and the like are executed in step S1. Next, in step S2, the rotation motor 7 is driven and the base 1 is rotated. Subsequently, in step S3, the feed motor 13 is rotated in the normal direction, and the carrier 15 is moved diagonally downward as the screw sleeve 14 rotates. This results in
As shown in FIG. 2, the armature 26 of the shape signal generator 25 enters the interior of the base 1. As shown in FIG.

Next, in step S4, the presence or absence of a contact signal from the shape signal generator 25 is determined, and if no contact signal is generated, the feed motor 13 continues normal rotation.

The carrier 15 is further moved downward, and as shown in FIG.
is closed, the air cylinder 21 is operated to protrude in step S5, the arm 19 is swung clockwise in FIG. Pressed. At the same time, the feed motor 13 is reversed in step S6 to move the carrier 15 diagonally upward, and the number of revolutions of the feed motor 13 is counted in step S7.

During the upward movement period of the carrier 15, the contact 27 of the shape signal generator 25 is slid along a spiral on the seat surface 3 as the base 1 rotates, as shown in FIG. 3(b). . Therefore, scratches on the sheet surface 3 are transmitted as vibrations of the contactor 27 to the piezoelectric element 28 via the armature 26 and converted into a voltage signal.

Then, in step S8, the flaw signal is transmitted to the flaw signal processing circuit 3.
1, the microcomputer 30 measures the surface accuracy of the sheet surface 3 based on the maximum value of the flaw signal in step S9, and displays the measured value on the surface accuracy display section 47 in step S10. expressed as the maximum surface roughness.

In step S11, it is determined whether there is a contact signal from the shape signal generator 25, and if there is a contact signal, the above-described surface accuracy measurement and display processing is continued.

On the other hand, as shown in FIG. 3(C), the contact 27
When the contact signal processing circuit 40 is released from the sheet surface 3, counting of the number of revolutions of the feed motor 13 is stopped in step S12, and a predetermined coefficient is added to the number of revolutions of the feed motor 13 in step S13. The height h of the seat portion 2 is measured by multiplying by . Then, this measured value is determined in step S1.
4 is displayed on the dimension display section 48. Therefore, the inspector can judge the quality of the shape of the seat portion 2 in the cap 1 by checking the displays on the surface accuracy display section 47 and the dimension display section 48.

After that, the rotation motor 7 is stopped in step S15,
The air cylinder 21 is contracted in step 816, and the feed motor 13 is reversed in step S17, so that the carrier 1
5 is returned to its original position.

As described above, the internal shape inspection device of this embodiment includes the rotation motor 7 that rotates the base 1 having the seat portion 2 inside,
A shape signal generator 25 that generates a signal corresponding to the shape of the sheet portion 2 using a contactor 27;
A feed motor 1 that moves the
3, and the seat portion 2 based on the signal from the shape signal generator 25.
A microcomputer 30 is provided to measure the surface accuracy and height h.

Therefore, according to the internal shape inspection device of the above embodiment,
The shape signal generator 25 generates a signal corresponding to the shape of the seat 2, and the microcomputer 30 measures the surface accuracy and height h of the seat 2 based on this shape signal. By converting this into an electrical signal, the quality of the cap 1 can be efficiently inspected with high accuracy.

By the way, in the above embodiment, the shape signal generator 25 is moved toward and away from the base 1, but this may be reversed so that the base 1 is moved relative to the shape signal generator 25. , or both may be configured to move. Further, in the above embodiment, the die 1 is illustrated as a workpiece, but the present invention is not limited thereto, and various products having a portion to be inspected inside can be inspected in the same manner as in the above embodiment.

In addition, in the above embodiment, the surface accuracy of the workpiece having a part to be inspected inside is displayed, but when implementing the present invention, it is possible to display defects in the object to be inspected or to select defects. You can also do it.

The measurement means for measuring the surface of the part to be inspected based on the signal from the shape signal generator 25 of the above embodiment is 1. Although the accuracy and length of the surface of the part to be inspected are tested, when implementing the present invention, only the accuracy or length of the surface of the part to be inspected may be tested.

[Effects of the Invention] As described above, the internal shape inspection device of the present invention includes a rotating means for rotating a workpiece having a portion to be inspected therein, and a contact between the portion to be inspected of the rotating workpiece and a contact. shape signal generating means for generating a signal corresponding to the shape of the part to be inspected based on the shape of the part to be inspected;
It consists of a moving means for moving either the shape signal generating means or the work toward and away from the other, and a measuring means for measuring the surface accuracy and dimensions of the part to be inspected based on the signal from the shape signal generating means. This has the effect of converting the shape of the part to be inspected into an electrical signal and efficiently inspecting the quality of the workpiece with high accuracy.

[Brief explanation of drawings]

1 to 5 show an embodiment of an internal shape inspection device according to the present invention, FIG. 1 is a front view showing the whole, and FIG. 2 is a partial front view showing an enlarged shape signal generator and a workpiece. , FIG. 3 is an explanatory diagram showing the relationship between the shape signal generator and the workpiece in different states, FIG. 4 is a block diagram showing the electric circuit, and FIG. 5 is a flow chart explaining the operation. In the figure, these are a base 2: a seat member: a rotation motor 13: a feed motor 25: a shape signal generator 27: a contactor 30: a microcomputer. In addition, in the figures, the same reference numerals and the same symbols indicate the same or equivalent parts.

Claims (1)

[Claims] (1) A shape signal having a rotating means for rotating a workpiece having a part to be inspected therein, and a contactor that enters the inside of the workpiece, and generating a signal based on contact between the part to be inspected of the workpiece and the contactor. A generating means; a moving means for displacing the relative distance between the shape signal generating means and the workpiece; and a measuring means for measuring the surface of the part to be inspected based on the signal from the shape signal generating means. Characteristic internal shape inspection device.