JPH0613442Y2 - Automatic visual inspection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial field of application" The present invention relates to an automatic visual inspection apparatus for inspecting the external appearance of the tip of an inspected object such as a miniature drill.

"Conventional technology" Conventionally, the quality of a drill such as a miniature drill, the tip of which was processed by a drill tip processing machine, is judged by enlarging the tip shape of the drill with a microscope and inspecting the enlarged tip shape. The personnel were inspecting visually. In addition, at this time, the drill determined to be defective was processed using a manual pointer.

"Problems to be solved by the device" However, when the quality of the drill tip is judged by the above-mentioned conventional visual inspection, and when a defective drill is manually reprocessed, labor is required, which is troublesome. In addition to this, since the work is performed while looking through the microscope, there is a problem that the worker is easily tired and that the judgment result of the inspection varies depending on the worker.

Further, the present applicant has proposed an automatic drill tip processing machine that automatically processes the tip of the drill into a predetermined shape by importing an image of the unprocessed drill tip into the image pattern recognition device ( In Japanese Patent Application No. 60-41320), with this processing machine, the image of the flat, unprocessed drill tip can be clearly captured by the image pattern recognition device, and can be processed accurately into a predetermined shape. Since the drill tip after processing has a three-dimensional shape, it is not possible to capture a clear image into the image pattern recognition device, and it is difficult to use it for inspection or correction processing of the above-mentioned drill tip. It was

The present invention has been made in view of the above circumstances, and an object thereof is to automatically perform an unattended appearance inspection even for an inspection object having a three-dimensional shape such as the tip of a drill. It is an object of the present invention to provide an automatic appearance inspection device which can determine the quality of an object to be inspected easily and surely and can shorten the inspection time.

[Means for Solving the Problems] In order to achieve the above object, the present invention holds an object to be inspected and is horizontally moved in the X-Y axis direction by a moving means, and a first rotating means. It has a main shaft part that is horizontally rotated by the second rotating means and is vertically rotated by the second rotating means, and a depth-of-focus adjustment mechanism for obtaining a required depth of focus for the inspection target area at the tip of the inspection object. And a shape detecting device for detecting the shape of the tip of the object to be inspected held on the main shaft, and the shape of the tip of the object to be inspected obtained by the shape detecting device and a reference shape stored in advance. Image pattern recognition for determining the inspection position of the tip of the inspected object and determining whether the shape of the tip of the inspected object is good or bad based on a preset inspection area and an inspection criterion. Device and the image pattern recognition device A control device for positioning the inspection object by controlling at least the moving means or the first rotating means on the basis of the signal from, and a defective portion of the tip end portion of the inspection object which is determined to be defective by the image pattern recognition device. And a grinding means for grinding.

[Operation] In the automatic visual inspection apparatus of the present invention, the shape of the tip of the inspection object detected by the shape detection apparatus is compared with the reference shape in the image pattern recognition apparatus, and control is performed based on this result. The moving device and the first rotating device are operated by the device to index the inspection position of the tip of the inspection object,
The quality of the shape of the tip of the inspected object is determined based on the inspection area and the inspection determination standard set in advance. Then, when it is determined to be defective, the defective portion of the tip portion of the object to be inspected is ground by the grinding means and processed into a desired shape.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 9.

FIG. 1 shows the entire automatic drill tip inspection and re-grinding device. In FIG. 1, reference numeral 1 is a main shaft portion that detachably holds a drill 2 by a collet chuck. This spindle 1
Is rotated in the circumferential direction by the main shaft drive motor 3 and is tilted up and down by the θ-axis drive motor 4, and is also provided with an X-axis drive motor 5 and a Y-axis drive motor 6. It is provided on the table 7 and X
The structure is such that it can move in the axial and Y-axis directions.

A loading device 8 for loading the drill 2 on the spindle 1 is provided on the right side of the front of the XY table 7.
And an unloading device 10 for unloading the drill 2 of the spindle 1 onto the storage device 9, and on the opposite side thereof, the tip of the drill 2 held by the spindle 1 is ground. A point grinding unit 11 for processing is installed.

On the other hand, a shape detecting device 12 for detecting the tip shape of the drill 2 held by the main spindle portion 1 is arranged above the central portion of the XY table 7 with the main spindle portion 1 facing upward. ing. As shown in FIG. 3, the shape detecting device 12 includes a microscope section 13 for enlarging the tip of the drill 2.
And a television image pickup tube portion 14 for picking up an image of the tip shape enlarged by the microscope portion 13, and the microscope portion 13
A relay lens 16 for obtaining a magnification and a diaphragm mechanism 17 for adjusting a diaphragm are provided between the zoom type objective lens 15 and the television image pickup tube section 14. This allows
As shown in FIG. 4, the microscope section 13 has a deep focal depth that is sufficient to obtain a required focal depth D corresponding to various drills 2. In the figure, α
Is the tip angle of the drill 2 and is set to, for example, 110 ° to 130 °. Further, the tip shape (image) obtained by the television image pickup tube portion 14 is sent to an image pattern recognition device 18, as shown in FIG. 2, and the image pattern recognition device 18 is inputted in advance. Control device for controlling each of the drive motors 3, 5 and 6 such that an error amount (number of mismatched dots) c between the reference shape b of the tip of the drill 2 and the tip shape a is equal to or less than an allowable value or is minimum. A command signal is output to 19 to detect and position the detected position of the drill 2, and as shown in FIGS. 6 to 9,
The inspection areas (windows) W _{1 to} W ₄ and the error amounts c _{1 to} c _{4 that} are set in advance for each inspection item (gear and overlap, cutting edge offset and cutting edge taper, warp and droop, for cutting edge) Based on the allowable value (inspection criteria),
It is configured to determine the quality of the tip of the drill 2.

The drive motors 3, (4), 5 and 6 are pulse motors or servo motors, and the permissible values used in the image pattern recognition device 18 are determined by operating switches on the panel surface. It is configurable. Further, a monitor television 20 for monitoring the tip shape of the drill 2 is connected to the image pattern recognition device 18.

In the automatic drill tip inspection and regrinding apparatus configured as described above, when the tip of the drill 2 is inspected, first, the loading device 8 is operated to move to the position shown by the chain double-dashed line in FIG. Attach the drill 2 to the main shaft portion 1 at. Next, the XY table 7 is operated to move the main spindle 1 to the position of the shape detection device 12 in FIG. 1, and the θ-axis drive motor 4 is operated to direct the main spindle 1 upward. Then, the shape of the tip of the drill 2 (for example, the shape indicated by the symbol a in FIG. 5) is obtained by the microscope unit 13.
Is detected, converted into an electric signal (image signal) by the television image pickup tube portion 14, and input to the image pattern recognition device 18. Then, in this image pattern recognition device 18, it is compared with a reference shape (shape indicated by reference character b in FIG. 5) stored in advance, and the error amount (hatched portion indicated by reference character c in FIG. 5) does not match. Is detected as the dot number of. The image pattern recognition device 18 controls the control device 19 so that the number of dots is equal to or less than the set allowable amount.
Since a command signal is output to the control device 19, the control device 19 controls the spindle drive motor 3 to rotate the spindle part 1 by a predetermined angle based on the command signal, and the drill 2 is indexed and positioned at the inspection position. . At this time, the control device 19 also operates the X-axis and Y-axis drive motors 5 and 6 so that the error amount c is minimized, and also corrects the position of the drill 2 in both X and Y axis directions.

When the drill 2 is positioned at the detection position in this way, then, as shown in FIGS. 6 to 9, each inspection item (gear and overlap, cutting edge offset and cutting edge taper, sled and drooping). , in the inspection region W ₁ to _W-4, which is set in advance for each cutting edge over), the error amount c ₁ to c ₄ are each error amount c ₁ of the actual shape a and the reference shape b of the tip of the drill 2 ~ C ₄ is compared with the allowable value (inspection criterion), and if each inspection item is less than the allowable value, the image pattern recognition device 18 determines that the drill 2 is a good product. Based on the result, the unloading device 10 is operated to store the drill 2 in the storage device 9. If even one of the above inspection items exceeds the allowable value, the image pattern recognition device 18 determines that the drill 2 is defective, and based on this result, each drive motor 4, 5, 6 Is operated to expose the drill 2 to the point grinding unit 11, and the point grinding unit 11 re-grinds the portion of the drill 2 determined to be defective.

As described above, in the automatic drill tip inspection and re-grinding device, the shape detecting device 12, the image pattern recognizing device 18, the control device 19 and the spindle drive motor 3 are used to detect the position of the drill 2. Since the positioning is automatically performed and the quality of the drill 2 is surely judged by the image pattern recognition device 18, the visual inspection of the drill 2 and the re-grinding of the defective drill 2 are unmanned and automated. The inspection standard can be maintained high and constant.
Further, even for many kinds of works, the reference shape of each work can be dealt with only by inputting and storing it in the image pattern recognition device 18, and the setup time can be shortened. Furthermore, since the inspection area can be changed for each inspection item, the inspection can be completed in a short time.

In addition, in the above-mentioned embodiment, the case where the shape of the tip portion of the drill 2 is inspected has been described, but since a microscope having a deep depth of focus is used, it can be applied to the appearance inspection of other three-dimensionally inspected objects. In addition, in order to shorten the inspection time, the inspection position of the inspection object is indexed in advance,
In the apparatus of the present invention, only the visual inspection of the inspection object may be performed.

[Advantage of Invention] As described above, according to the present invention, even if the shape of the object to be inspected obtained by the shape detection device is three-dimensional, the shape is compared with the reference shape in the image pattern device. Then, based on this result, the control unit operates the moving means, the first rotating means, etc. to index the inspection position of the tip of the object to be inspected, and sets the inspection area and the inspection judgment standard set in advance. Since the shape of the object to be inspected is judged based on the, the unattended and automatic appearance inspection can be performed, the inspection efficiency can be improved, and the inspection accuracy can be kept high and constant. The time required for replacement is shortened, and it is possible to easily deal with the inspection of many kinds of works. Moreover, there is an advantage that not only the visual inspection but also the correction of the inspection object can be automatically performed by correcting the defective portion of the inspection object determined to be defective with the grinding means.

[Brief description of drawings]

1 to 9 show an embodiment of the present invention.
1 is a plan view of the whole, FIG. 2 is a block diagram, FIG. 3 is a schematic configuration diagram showing the configuration of a shape detection device, FIG. 4 is a side view of a drill, and FIG. 5 is a principle of inspection position indexing. Explanatory diagram showing
FIGS. 6 to 9 show various inspection items. FIG. 6 is an explanatory diagram for explaining the gear trap and the overlap, FIG. 7 is an explanatory diagram for explaining the cutting edge shift and the cutting edge taper, and FIG. FIG. 9 is an explanatory diagram for explaining a warp and a droop, and FIG. 9 is an explanatory diagram for explaining cutting edge cutting. 1 ... Spindle part, 2 ... Drill (inspection object), 3 ... Spindle drive motor (rotating device), 12 ... Shape detection device, 13
...... Microscope section, 14 ...... TV image pickup tube section, 15 ...... Zoom type objective lens, 16 ...... Relay lens, 17 ...... Aperture mechanism, 18 ...... Image pattern recognition device, 19 ...... Control device, a ...... tip shape, b ...... reference shape, D ...... required focal _depth, W 1 ~W ₄ ...... inspection area (window).

Claims (1)

[Scope of utility model registration request] 1. An object to be inspected is held, horizontally moved in the XY axis directions by a moving means, horizontally rotated by a first rotating means, and vertically rotated by a second rotating means. It has a main shaft part and a focal depth adjustment mechanism to obtain the required depth of focus for the inspection target area of the tip part of the inspected object, and the tip part of the inspected object held on the main shaft part The shape detection device that detects the shape is compared with the shape of the tip of the object to be inspected obtained by the shape detection device and a reference shape stored in advance to determine the inspection position of the tip of the object to be inspected. An image pattern recognition device for indexing and determining the quality of the shape of the tip of the inspected object based on a preset inspection region and an inspection determination standard, and at least the movement based on a signal from the image pattern recognition device. Means or first time An automatic appearance comprising: a control device for controlling the means for positioning the object to be inspected, and a grinding means for grinding the defective part of the tip of the object to be inspected, which is determined to be defective by the image pattern recognition device. Inspection device.