JP2002036070A - Defect detection device for machined metal part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the yielding percentage of products by detecting the residual foreign matter such as cutting chips produced by the machining of formed products by casting and forging or the deformation of the inner bottom part of a machined groove. SOLUTION: This defect detection device comprises a measurement part having a turntable rotated by a motor at a constant speed and a metal part fixing means, a measurement element movable forward and backward by a means moved forward and backward to the inside of the metal part fixed to the turntable and a disk coaxially installed with the measurement element, and a means to displace the measurement element and the disk coaxially installed on the measurement element in a specified direction crossing the forward and backward moving direction and a sensor part allowed to abut on the outer peripheral surface of the disk and detecting the presence of the foreign matter in a cutting groove or the deformation of the bottom part in the groove by sensing the displacement of the disk. Thus, the remaining foreign matter such as cutting chips on various types of parts having recessed parts such as grooves formed on an inner diameter side by machining or the presence of the deformation of the bottom part in the groove can be inspected precisely, and the yielding percentage of the products can be increased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to various types of engine parts, such as automobile parts and marine pistons, which are formed by casting or forging, and in which recesses are formed on the inner diameter side of seal ring grooves by cutting. Product defects in parts, for example, foreign matter such as cutting chips adhered during cutting remains in the recess formed on the inner diameter side, or the groove bottom shape of the formed recess itself is elliptical, or undulation or step An apparatus for detecting a defect as a product due to having the object has an object to detect a remaining foreign substance or a defect and to remarkably improve a product yield rate.

[0002]

2. Description of the Related Art Engines and related parts of automobiles, ships, etc., have a complicated structure made of metal such as castings, iron or aluminum, and after casting, these are used for MC milling and NC lathes / special machines. In many cases, a concave cutting grooving process is performed on the inner peripheral surface by using such a method, and the product is finally washed and commercialized.

[0003]

However, at the time of cutting grooving, strip-shaped cutting chips having the same width as the grooving tool are likely to remain and adhere to the inside of the groove. Further, when a power failure or an unexpected impact is applied during the concave cutting grooving, a step may be formed on the bottom of the groove, or the contour of the groove may be elliptical or undulating. Therefore, if this is overlooked, the parts cannot be assembled due to, for example, malfunctions, dimensional defects, or concentric defects in each part, and undulation of the groove bottom surface occurs, and further, oil leakage of brake parts and the like occurs. Therefore, it is necessary to take complete measures to remove the remaining cutting chips or to detect the groove formation defect.

[0004]

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned problems in the prior art, and to eliminate foreign matter such as cutting chips after cutting, or to provide a product such as a step, an ellipse, and a undulation on the bottom surface in a groove. As a result, the product yield rate is remarkably improved by detecting a defect. Specifically, the invention according to claim 1 is configured to rotate at a constant speed by a motor,
Moreover, a turntable provided with means for fixing metal parts,
A probe that can be moved back and forth by means for moving back and forth toward the inside of the metal component fixed to the turntable, a disk provided coaxially with the probe, and a disk provided coaxially with the probe. A measuring unit having a means for displacing in a fixed direction intersecting the direction of its movement,
The present invention relates to a defect detection device for a cut metal part, which comprises a sensor portion which comes into contact with the outer peripheral surface of the disk and detects the presence of a foreign substance by detecting the displacement of the disk, or the deformation of a concave portion such as a step, an ellipse, and an undulation.

The invention according to claim 2 relates to the defect detecting device for a cut metal part according to claim 1, wherein the tracing stylus is a roller attached to a tip of a measuring shaft held by a measuring section. Further, the invention according to claim 3 is a roller in which the tracing stylus is attached to a tip of a measuring shaft held by a measuring unit, and the roller has a concave cutting surface formed along an inner peripheral surface of a metal part. The defect detection device for a cut metal part according to claim 1 or 2, wherein the device is capable of rolling along a bottom surface in the groove.

Further, the invention according to claim 4 is characterized in that the means for moving the probe and the disk provided coaxially with the probe toward the inside of the metal part fixed to the turntable includes an air cylinder or a hydraulic cylinder. The present invention relates to an apparatus for detecting a defect of a cut metal part according to any one of claims 1 to 3. Further, the invention according to claim 5 is characterized in that the means for displacing the measuring element and the disk provided coaxially with the measuring element in a certain direction intersecting the moving direction of the measuring element is an air cylinder or a hydraulic cylinder. 4. A defect detection device for a cut metal part according to item 4.

Further, the invention according to claim 6 relates to the defect detecting device for a cut metal part according to any one of claims 1 to 5, wherein the sensor section is a limit switch or a displacement sensor. Further, according to a seventh aspect of the present invention, the sensor section includes:
The method according to claim 1, wherein when detecting the presence of a foreign object or deformation of the concave portion by detecting the displacement of the disk, the starting power of the fixing means is cut off so that the fixing of the metal part fixed on the turntable cannot be released. The present invention relates to a defect detection device for a cut metal part described in any one of 1 to 6.

The invention according to claim 8 is that the sensor unit activates an alarm sound and / or an alarm lamp when detecting the presence of a foreign substance or deformation of the concave portion by detecting the displacement of the disk. The present invention relates to a defect detecting device for a cut metal part according to any one of claims 1 to 7.

In the above construction, the metal parts are mounted on the rotary shaft core of the turntable so as to be coaxially aligned therewith and fixed integrally by fixing means, and then the motor is driven to drive the turntable at a constant speed. By rotating the cylinder and then driving the cylinder, the probe at the tip of the measuring shaft is advanced toward the inside of the metal part fixed on the turntable, and another cylinder is driven to drive the probe and the measurement. The disk coaxial with the probe is moved in the side direction, that is, in a certain direction intersecting the reciprocating direction of the probe, etc., while the probe is in contact with the bottom of the excavation groove formed inside the metal part, and the turntable is further turned on. Continue rotating.

At this time, if excavation debris or the like adheres to the excavation groove formed inside the metal part on the turntable, or if there is a concave deformation such as a step, an ellipse, or undulation at the bottom of the groove, the above measurement is performed. The sensor is in contact with a disk coaxial with the measuring element, and the displacement is caused by the displacement of the axis of rotation of the element.As a result, the drive power of the motor for driving the turntable is turned off and the turntable is turned off. Stop the rotation of
Or turn off the power while keeping the fixing means fixed,
The metal part is locked so that it cannot be removed, or an alarm sound and / or an alarm light is activated to emphasize the presence of foreign matter or the presence of a concave deformation.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The specific contents of the present invention will be described below with reference to the embodiment of FIGS. 1 to 4. Reference numeral 1 denotes a turntable, 6 denotes a measuring unit, and 14 denotes a sensor unit.
The turntable 1 is integrally fixed to one end of a rotating shaft 2 of a motor 3 mounted on a horizontal base 5, and is configured to rotate at a constant speed as the motor 3 rotates. Further, the upper surface of the turntable 1 is provided with fixing means 4.4 for fixing a metal component (work) 17.
That is, for example, the fixing means 4 includes two or three fixed ends that are rotatably fixed and the free ends are driven by electromagnetic force, hydraulic pressure, or an air cylinder.
A chuck having a known structure including a plurality of claw pieces provided at symmetrical positions may be used.

The measuring section 6 comprises a measuring element 13 which can be moved back and forth by means for moving back and forth toward the inside of the metal part 17 fixed to the turntable 1 and a disk 11 provided coaxially with the measuring element 13. And a means 10 for displacing the tracing stylus 13 and the disk 11 provided coaxially with the tracing stylus 13 in a fixed direction intersecting the moving direction of the tracing stylus. That is, in this case, as means for moving back and forth toward the inside of the metal part 17 fixed to the turntable 1, in this case, in the vertical direction along the rod 7 a attached to the back panel 19 erected on the base 5 described above. Air cylinder that can be moved toward (or may be a hydraulic cylinder) 7
Is used.

A tracing stylus 13 and a disk 11 provided coaxially with the tracing stylus 13 are attached to a measuring shaft 12 which is mounted in the direction of the turntable 1 via an arm 8 which is integrally mounted to the air cylinder 7. The disc 13 is mounted coaxially and integrally at a position close to the mounting base of the measuring shaft 12 at a fixed interval from each other, with the probe 13 as the tip. As for the tracing stylus 13 attached to the tip of the measuring shaft 12 described above, in the cutting groove 18 formed inside the metal part 17 fixed to the turntable 1, a constant speed is set with the rotation of the turntable 1. A roller is preferably used so that the rolling sliding contact is smooth along the inner bottom surface of the concave cutting groove 18 formed on the inner peripheral surface of the rotating metal part 17.

The means 10 for displacing the measuring element 13 and the disk 11 provided coaxially with the same in a fixed direction intersecting the direction of movement of the measuring element 13 includes a pair of right and left support plates 8a attached to the arm 8. An air cylinder (or a hydraulic cylinder) that can move in a certain direction (left and right in the embodiment of FIG. 1) along the rod 9 supported therebetween is used.
The disk 11, the drive shaft 12, and the tracing stylus 13 are attached to the lower side of. In addition, as the above-mentioned displacement means 10, a step motor or the like can be used in addition to the above.

Further, the sensor section 14 only needs to be capable of detecting the displacement of the disk 11 described above, and in the case of the present embodiment, such a displacement sensing element is a bracket that is provided upright on the horizontal base 5. 15 and a contact switch 16a at the tip thereof.
The position of the limit switch 16 is determined by contacting the outer peripheral surface (radial surface) of the disk 11 with the displacement switch of the disk 11 and detecting the presence of foreign matter. By loosening
The mounting position is configured to be adjustable. As the sensor in this case, a contact displacement sensor can be used in addition to the limit switch described above.

Further, in the sensor section 14, the disk 1
When the presence of foreign matter in the groove or the deformation of the bottom of the concave groove is detected by detecting the displacement of
The so-called inspection omission is eliminated by turning off the start-up power supply so that the fixing of the metal component 17 fixed on the turntable 1 cannot be released, or by activating an alarm sound and / or an alarm lamp. be able to.

In the above configuration, the turntable 1
The metal part 17 is placed on the rotating shaft core, and the metal part 17 is fixed by fixing means 4. The motor 3 is driven to rotate the turntable 1 at a constant speed. Next, the measuring unit 6 is lowered by driving the air cylinder 7 which is means for moving forward and backward toward the inside of the metal component 17, and the measuring element 13 attached to the measuring axis 12 together with the disk 11 together with the tip of the measuring axis 12 is attached to the measuring axis 12. The metal part 17 is rotated toward the inside of the axis of the rotating metal part 17.

Next, the probe 13 and the probe 13
The air cylinder, which is means 10 for displacing the disk 11 coaxial with the disk 11 in a fixed direction (side direction) intersecting the direction in which the disk 11 advances and retracts, drives the measurement shaft 12 along the rod 9 toward the sensor unit 14. And, along with this, probe 1
3 contacts the inner bottom of the cutting groove 18 formed inside the metal component 17, and the outer peripheral surface of the disk 11 also contacts the contact 16 a of the limit switch 16.

However, if chips or the like remain in the cutting groove of the metal part 17 or deformation such as a step, an ellipse, or undulation is observed at the bottom of the cutting groove, the tracing stylus 13 is moved to the inner bottom surface of the cutting groove 18. In the process of rolling along, the disk 11 gets over a deformed portion such as the above-mentioned cutting waste or a step, and as a result, the disk 11 is displaced as a result of this getting over, so that a slight impact is applied to the contact 16 a of the limit switch 16. Accordingly, the limit switch 16 can detect the presence of foreign matter such as cutting chips and the presence of deformation in the concave portion.

In the sensor section 14, the metal parts 17
When the presence of foreign matter or deformation in the cutting groove 18 is detected, the starting power source of the fixing means 4 is cut off so that the metal component 17 fixed on the turntable 1 cannot be released. Alternatively, by activating an alarm sound and / or an alarm lamp, so-called inspection omission can be eliminated.

[0021]

According to the present invention, as described above, the turntable provided at the constant speed by the motor and provided with the means for fixing the metal parts, and the means for moving the metal table fixed to the turntable toward the inside of the metal parts move back and forth. A measuring unit comprising: a freely tracing stylus, a disc provided coaxially with the tracing stylus, and a means for displacing the measuring stylus and a disc provided coaxially with the tracing stylus in a fixed direction intersecting the direction of movement thereof. And a sensor portion that abuts on the outer peripheral surface of the disk and senses the displacement of the disk to detect the presence of foreign matter or deformation in the concave groove. In addition, it is possible to accurately detect the presence of foreign matter such as cutting debris or the presence of deformation at the bottom of the cutting groove in various parts that have been formed by casting, forging, etc., and that have formed recesses such as grooves on the inner diameter side by cutting. It can be, such as the presence of foreign matter or groove bottom deformation remaining, it can be achieved significant improvement in product yield rate by detecting a product defect.

Further, the above-mentioned tracing stylus is a roller attached to the tip of a measuring shaft held by a measuring part, and the roller extends along the inner bottom surface of a concave cutting groove provided along the inner peripheral surface of the metal part. When rolling is possible, the rolling sliding contact along the inner bottom surface of the concave cutting groove provided on the inner peripheral surface of the metal part rotating at a constant speed becomes smooth, and the measurement accuracy is further improved. .

Further, when the sensor detects the displacement of the disk and detects the presence of foreign matter in the cutting groove or the presence of a step or other deformation at the bottom of the groove, the starting power supply of the fixing means is cut off and fixed on the turntable. Can not release the fixed metal parts,
Alternatively, if the alarm sound and / or the alarm light is activated, the post-processing when detecting the presence of foreign matter in the cut groove of the metal part or deformation of the bottom of the groove in the sensor unit can be more complete, so-called There is no danger of missing the inspection.

[Brief description of the drawings]

FIG. 1 is a front view of a defect detection apparatus for a cut metal part according to an embodiment of the present invention.

FIG. 2 is a side view of the defect detection device for a cut metal part in FIG. 1;

FIG. 3 is a front view showing a state of detecting a defect in a cut groove of the cut metal part.

FIG. 4 is an enlarged view of a portion A in FIG. 3;

[Explanation of symbols]

 Reference Signs List 1 turntable 2 rotating shaft 3 motor 4 fixing means 5 base 6 measuring section 7 air cylinder 7a rod 8 arm 9 rod 10 means for displacing in a fixed direction 11 disk 12 measuring axis 13 measuring element 14 sensor section 15 bracket 16 limit switch 16a contact Child 17 Metal parts 18 Cutting groove 19 Back panel

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2F069 AA06 AA60 GG01 HH04 JJ17 JJ19 MM02 MM04 MM23 MM34 QQ03 3C029 BB01 BB02

Claims (8)

[Claims] 1. A turntable which is rotated at a constant speed by a motor and has means for fixing a metal part, and a probe which can move forward and backward by means for moving forward and backward toward the inside of the metal part fixed to the turntable, and the measuring element A measuring unit having a disc provided coaxially with the probe, and a means for displacing the probe and the disc provided coaxially with the probe in a fixed direction intersecting the direction of movement of the probe, A defect detecting device for a cut metal part, comprising: a sensor portion which comes into contact with an outer peripheral surface and senses a displacement of a disk to detect the presence of foreign matter or deformation of a concave portion. 2. The defect detecting device for a cut metal part according to claim 1, wherein the tracing stylus is a roller attached to a tip of a measuring shaft held by a measuring unit. 3. The measuring element is a roller attached to the tip of a measuring shaft held by a measuring section, and the roller is attached to a concave cutting groove inner bottom surface formed along the inner peripheral surface of the metal part. The defect detection device for a cut metal part according to claim 1, wherein the defect can be rolled along. 4. The air cylinder or the hydraulic cylinder, wherein the means for moving the probe and the disk provided coaxially with the probe toward the inside of the metal part fixed to the turntable is an air cylinder or a hydraulic cylinder. 2. The defect detection device for a cut metal part according to claim 1. 5. The air cylinder or the hydraulic cylinder according to claim 1, wherein the measuring element and the means for displacing the disk provided coaxially with the measuring element in a predetermined direction intersecting the moving direction of the measuring element are air cylinders or hydraulic cylinders. Defect detection device for cutting metal parts. 6. An apparatus according to claim 1, wherein said sensor is a limit switch or a displacement sensor. 7. When the presence of foreign matter or deformation of the concave portion is detected by detecting the displacement of the disk, the sensor section can cut off the starting power supply of the fixing means and release the fixing of the metal part fixed on the turntable. The defect inspection apparatus for a cut metal part according to claim 1, wherein the defect inspection apparatus is to eliminate the defect. 8. The sensor according to claim 1, wherein the sensor section activates an alarm sound and / or an alarm lamp when the presence of a foreign object or the deformation of the concave portion is detected by detecting the displacement of the disk. Defect detection device for cutting metal parts.