JP3832642B2 - Defect inspection method and inspection apparatus for polyamide resin molded body - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a defect inspection method and apparatus for nondestructive inspection of internal defects such as pinholes and cracks interposed in a polyamide resin molded body, and more specifically, the resin molding is performed by searching for a defect using an ultrasonic flaw detector. The present invention relates to a technique for visualizing the presence or absence of defects on the outer peripheral surface of a body with a mark.
[0002]
[Prior art]
Conventionally, a polyamide resin molded body is placed horizontally on a receiving roll provided on an inspection table, the outer peripheral surface is wetted with a wet cloth, and a portable type flaw detection head is placed in the other hand while turning with one hand. Then, while observing the flaw detection screen while touching the surface and moving it sideways, if an abnormal wave was caught, it was replaced with a red pencil and a mark was drawn to draw the abnormal part. In this way, all inspections were performed manually.
[0003]
For example, Japanese Patent Laid-Open No. 10-282068 discloses a conventional ultrasonic flaw detection technique. According to this, a defect inspection of a resin-coated metal body having a coating thickness of 10 mm or less is performed using an ultrasonic flaw detector equipped with a roller-type probe. In addition, the shape and material were different, and the manufacturing form and usage were also different.
[0004]
[Problems to be solved by the invention]
However, the polyamide resin molded body is a solid resin rod cast by polymer molding by casting a resin liquid into a cylindrical mold or a core obtained by polymerizing and molding a resin liquid by placing a rod-shaped metal core at the center of the mold. It is formed of a resin rod containing gold and is to prevent internal defect defects such as pin holes and cracks interposed in the resin portion.
[0005]
Also, as described above, manually rotate and touch the outer peripheral surface with a probe to catch abnormal waves on the screen, pick up a red pencil, mark the position, and repeat this to explore the entire surface In order to do this, considerable labor is required, and there has been a problem of work variations such as misalignment of marks and oversight of defects, and occurrence of poker misses due to human labor.
[0006]
Accordingly, there has been a demand for automatic mechanization that improves such problems and has high reliability, high processing speed, and low cost. It is an object of the present invention to provide a technique capable of automatically detecting internal defects of a polyamide resin molded body that eliminates manual labor and performs mechanization of inspection with high processing speed and high processing accuracy from such a non-destructive inspection process.
[0007]
[Means for Solving the Problems]
  In the invention of the defect inspection method for a polyamide resin molded body according to claim 1, which solves the above problem, the internal defect of the polyamide resin molded body polymerized by a cylindrical mold is removed.,When inspecting for the presence or absence of defects using an ultrasonic flaw detection method, the polyamide resin molded body is immersed in water and rotated at a constant speed, and an ultrasonic wave is incident on the outer surface of the polyamide resin in close proximity to the outer surface. The resin molded body is fed at a constant speed in the axial direction from one end to the other end to scan the entire outer surface, detect an ultrasonic reflected wave from an internal defect portion interposed in the resin molded body, and detect the defective portion. On the outer surface ofGrooves were carved into the outer peripheral surface of the polyamide resin molded body and the grooves were colored.MarkinggoIt is characterized by visualizing the presence or absence of invisible defects inside.
[0008]
  In particular, it is possible to search for internal defects of the polyamide resin molded body from the outside, inspect the defective portions, and apply markings that do not disappear to the defective portions to cope with visualization at a glance.In addition, there was no trouble that the mark disappeared by scratching and scratching the outer peripheral surface of the resin molded body, and the visibility was improved because the groove was colored.
[0010]
  Claim 2The defect inspection apparatus for the polyamide resin molded body described is a water tank capable of submerging the polyamide resin molded body when searching for internal defects of the polyamide resin molded body polymerized with a cylindrical mold using an ultrasonic flaw detector, A plurality of driveable rotating rolls that are parallel to the lower surface of the resin molded body that is placed horizontally and rotated and received from below, and at least one end surface is displaced in the axial direction due to the rotation of the resin molded body. A placing means that can be submerged in the aquarium with a seating means to suppress, a first position where the polyamide resin molded body is submerged, and an elevating means that can be freely changed between a second position that can be easily put in and out on the aquarium, Close proximity installation part of the ultrasonic probe straddling the outer peripheral surface of the rotating resin molded body, a height changing part that can be moved up and down according to the outer diameter of the resin molded body, and a small height that absorbs variation in the outer diameter. Adjustment section and the above Pulling scanning means and a lateral feed portion of the universal feed in the axial direction of the fat moldings, the resin molded body of the elevating means after inspection completion is raised to the second positionTheMarkedYouAnd a marking means.
[0011]
With this inspection device configuration, an ultrasonic flaw detector for internal defects in polyamide resin moldings can be used effectively, and variations can be absorbed if the installation height of the probe is adjusted according to the diameter size of the moldings. Thus, automatic mechanical scanning could be realized without fine adjustment of the probe.
[0012]
  Claim 3In the defect inspection apparatus for a polyamide resin molded body according to claim 3, in the configuration of claim 3, the placing means previously inclines two parallel horizontal axes so that the resin molded body is straddled between the two axes. The axis line is centered, and a rotatable seat is provided on the lower end side of the tilted axis line for positioning in the length direction. According to this, fine positioning is not required at the time of carrying the polyamide resin molded body onto the mounting means, the lateral positioning can be automatically performed, and the positioning operation can be monitored by the sensor.
[0013]
  Claim 4In the defect inspection apparatus for the polyamide resin molded body described inClaim 2In this configuration, the marking means is provided in common with the transverse feed portion of the ultrasonic probe. According to this, the lateral feed mechanism can be simplified without overlapping.
[0014]
  Claim 5In the defect inspection apparatus for the polyamide resin molded body described inClaim 2 or 4The marking means comprises a cutter for attaching a groove and an ink jet for coloring the inner surface of the groove. According to this, since the groove is formed on the surface of the resin molded body, it does not disappear. In addition, since the groove is colored, the ink in the groove is hardly peeled off.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of a defect inspection method for a polyamide resin molded body and a defect inspection apparatus thereof according to the present invention will be described with reference to FIGS. First, the defect inspection apparatus will be described in detail from its basic configuration. 1-3 show the front, top and side views of the defect inspection apparatus according to the present invention.
[0016]
First, using an ultrasonic flaw detector that performs vertical flaw detection by immersing the entire surface in a submerged state by a pulse reflection method, a placing means 4 for a polyamide resin molded body F (hereinafter simply referred to as a molded body), a water tank 3 to be submerged, and a water tank The lifting / lowering means 5 for taking in and out, the scanning means provided with the installation height change adjusting part and the lateral feed part for the ultrasonic probe 6, and the marking means 7 for marking and visualizing defects are configured.
[0017]
The configuration of the ultrasonic flaw detector is shown in FIG. 4, and is composed of a probe 6, an ultrasonic flaw detector main body 101, and a display 102. The probe 6 is close to the surface of the molded body F with a predetermined water distance. The ultrasonic flaw detector main body 101 is a well-known technique composed of a pulsar receiver having a transmission / reception function, a data processor for determining defects, and an oscilloscope capable of monitoring flaw detection waveforms.
[0018]
Next, the mounting means 4 according to the present invention rotates at a predetermined speed so that the molded body F can be horizontally placed and scanned all around, and the molded body F can be seated without being displaced and submerged in the water tank. Yes, the water tank 3 can submerge the probe 6 and the molded body F together with the rotary mounting means 4 to enable ultrasonic exploration and remove foreign matter in the water. The elevating means 5 is a mechanism for taking in and out of the water tank.
[0019]
Next, the scanning means 8 is provided with a roller guide on the outer peripheral surface of the molded body F that is submerged in the water tank 3 and rotated by the placing means 4, and has an ultrasonic probe 6a on the main body across the phase. A holding wheel 42 for bringing 6b close to the surface of the molded body, a height changing portion 9 for changing the outer diameter of the holding wheel 42, and a fine height adjusting portion 10 capable of absorbing the variation in the outer diameter and the amount of rotational vibration are provided. Formed by the ultrasonic probe 6 mounted on the roller guide portion, which is composed of a lateral feed portion 11 that presses and moves the proximity installation portion 103 provided with a roller guide to be separated by a distance to the other end. The surface of the body F is scanned parallel to the axis.
[0020]
Subsequently, the marking means 7 uses the scanning means 8 to cause the cutter 81 and the ink jet 51 to function, and feeds the defect data held in the ultrasonic flaw detector main body 101 by laterally feeding on the molded body F. A ring-shaped mark that makes a round on the outer peripheral surface of the molded body F corresponding to the position is attached.
[0021]
Subsequently, the individual main parts described above will be described in detail with reference to the drawings. First, as for the mounting means 4 of the present invention, as shown in the side sectional view of FIG. 3, a work cradle 19 integrated with the back plate 20, two rows of rotating roller shafts 14, shaft seats 12, 2 The shaft rotation drive unit 13 is configured.
[0022]
First, the work cradle 19 is manufactured as a shelf-like bottom surface perpendicular to the back plate 20 provided as a vertical wall surface. As shown in the top view of FIG. 2, two parallel rotating shafts 14 are inserted into bearing brackets 21a, 21b and 21c so as to be rotatably supported, and a partially cylindrical rotating roll 15 is fitted on the shaft. It is inserted and is supported by circumscribing the required part of the long shaped product F.
[0023]
In FIG. 2, a biaxial rotational drive unit 13 is arranged at the left end of the parallel biaxial rotating shaft 14, and a timing pulley 22 is fitted and a timing belt is stretched between the two shafts. Can rotate. Further, one of the shafts has a shaft end projecting further and a timing pulley 22 is further fitted therein, and is connected to a drive motor 23 disposed above so as not to be submerged by a timing belt (see FIG. 1).
[0024]
Next, as shown in the top view of FIG. 2, the shaft core seating portion 12 for centering with the axis of the right end surface of the molded body F placed on the two parallel axes is placed on the parallel two-axis intermediate axis. It is provided. As shown in detail in FIG. 6, the molded body F placed horizontally and inclined to the right is slid on the rotating roll 15 that is received, and the right end surface of the formed body F is aligned with the axial height. Stopped by the push rod 18 and positioned in the axial direction.
[0025]
A sensor 93 is provided in the shaft seat 12 so that it can be detected that the molded body F is surely placed and positioned at the right end at the time of stopping. The pushed core pushing rod 18 is restrained by the groove end 57 of the core pushing rod 18 by a stop pin 56 fitted to the rotating shaft due to the loss of the built-in spring 55, and the flange collar 92 secured to the core pushing rod 18 by this movement. Can be detected by operating the non-contact sensor 93.
[0026]
Next, about the water tank 3, the front cross section is shown in FIG. 1, the upper surface is shown in FIG. 2, and the side cross section is shown in FIG. As shown in FIG. 1, it is divided into two by a dam plate 25 that determines the height of the water surface. When it exceeds the height of the upper side, it overflows and spills into the bottom of the left partition in the figure, and supplies water to a water storage tank (not shown). A return pipe is provided from the outlet 27. Water in the tank overflowed by submerging the molded body F is returned to the water storage tank through this pipe. At that time, the foreign matter is removed by filtering with a strainer. The other section is a submerged tank of the molded body F, and the water in the tank is replenished from the water supply inlet 26 at the bottom, and the drain port 28 is provided as a drain.
[0027]
Next, as shown in the side sectional view of FIG. 3 and the top view of FIG. 2, the lifting means 5 is lifted by extending the cylinder 33 to the second position P2 where the molded body F is located above the water tank. The cylinder 33 is reduced and the back plate 20 is lowered, so that the first position P1 where the molded body F is submerged can be obtained. A linear rail 34 that slides and supports this lifting operation is fixed to the vertical surface of the frame 2, and a linear bearing 35 is mounted on the vertical surface of the mounting bracket 36 that is fixed to the vertical surface on the back surface of the back plate. It can operate smoothly by the vertical force of the connection bracket 32.
[0028]
Subsequently, the scanning means 8 is composed of a holding wheel 42 for the ultrasonic probe 6, a height changing unit 9, a fine height adjusting unit 10, and a lateral feed unit 11. FIG. FIG. 4 shows a side view. Here, the ultrasonic probe 6 is mounted so as to float from the surface of the molded body F between the rollers of a holding wheel 42 provided with two guide rollers 41 circumscribing the surface of the molded body F (see FIG. 4). ).
[0029]
First, the holding wheel 42 of the ultrasonic probe 6 is shown in a side view in FIG. 4 and a front view in FIG. 5. The cross section is an inverted L shape, and two guide rollers 41 are provided at the lower end. The outer shape is circumscribed and straddles the outer circle, and is directed to the axis of the molded body. Further, here, the ultrasonic probe 6 is composed of two units 6a and 6b (see FIG. 5), and in the internal defect flaw detection of the resin layer of the polyamide resin molded body F in which the core metal is contained in the center part, The depth of the surface to the cored bar surface is divided and used in such a manner that it is divided into flaw detection from the surface to the middle part and from the middle part to the cored bar surface.
[0030]
Next, the probe height changing unit 9 is a mechanism for matching the height of the holding wheel 42 circumscribing the surface of the molded body F in accordance with the change in the diameter size of the molded body F in accordance with the size. This is shown in FIG. This is because two guide rods 59 are provided on the base plate 58 so that the slide plate 62 to which the holding wheel 42 or the like is attached can be moved away from the molded body F, and the rod 59 is attached to the back surface of the slide plate 62. The inserted guide bushing is attached and supported so that it can move up and down smoothly.
[0031]
Further, a rotating handle 66 mounted on the upper end of the screw shaft is provided by arranging the screw shaft of the ball screw 65 between the two guide rods 59 and screwing the screw nut provided on the back surface of the slide plate 62 described above. The above-mentioned slide plate 62 is slid up and down by rotating forward and backward. Further, a shaft locking split collar 63 is provided on the slide plate 62 in order to prevent the displacement of the vertically moved position, and the lock handle 64 is turned and tightened so that the guide rod 59 can be grasped and fixed.
[0032]
Subsequently, the probe height fine adjustment unit 10 follows the fluctuation of the vertical movement during the scanning after the height change as described above to ensure that the proximity height of the probe 6 is secured. As shown in FIGS. 4 and 5, the connecting bracket 49 is fixed to the rod end of the cylinder 52 mounted on the above-mentioned slide plate 62, and the lower surface thereof is configured. A coil spring 44 is interposed between a holding wheel 42 provided further downward from 46 and is configured to be extendable.
[0033]
The two guide shafts 45 are provided on the upper surface of the holding wheel 42, the lower surface 46 of the connecting bracket 49 is inserted, the coil spring 44 is inserted on the shaft 45 therebetween, and the shaft tip is closed by a fixing flange 48. When the spring is extended, the lower surface of the fixing flange 48 comes into contact with the upper surface of the spring guide seat 47 fitted in the insertion portion of the lower surface 46 of the connecting bracket 49 and is supported by tension. When the spring is compressed, the lower surface of the fixing flange 48 is compressed. And a clearance between the upper surface of the spring guide seat 47 and the compression of the coil spring 44 can be absorbed. As a result, the height of the holding wheel 42 can be finely adjusted up and down at all times, and the fluctuation of the vertical movement can be followed.
[0034]
Subsequently, the lateral feed unit 11 is a mechanism that collectively feeds the base plate 58 on which the ultrasonic probe 6, the marking unit 7, the height changing unit 9, and the fine height adjusting unit 10 shown in FIG. 5 are mounted. FIG. 1 is a front view thereof, FIG. 2 is a top view thereof, and FIG. 3 is a side view thereof. It comprises a linear bearing 77 for traversing slide, a linear rail 78, a traversing belt 72, a pulley 73, a driving pulse motor 74, and a connecting metal fitting 70 that connects the traversing belt 72 to the base plate 58.
[0035]
First, as shown in FIG. 3, in the base plate 58, two linear rails 78 are fixed in the horizontal direction for lateral feed at an upper position where the vertical surface of the back plate 20 is not submerged, and linear bearings 77 are attached to the rails 78. It is fastened to the base plate 58 and can be moved laterally smoothly.
[0036]
The connecting plate 70 is extended in the horizontal direction on the upper end surface of the base plate 58 in the horizontal direction, and is driven by being pushed and pulled in the horizontal direction. As shown in the upper surface of FIG. 2, the left end in FIG. 2 is used as a drive shaft at both ends on the back side of the back plate 20, and a driven pulley is provided at the right end, and a transverse belt 72 is suspended between them. As shown in the front of FIG. 1, the upper row of the belt and the connecting metal fitting 70 are fastened, the belt is rotated from one end to the other end, and the belt is rotated in the normal direction.
[0037]
As shown in FIG. 3, this rotational driving is performed by attaching a mounting bracket 71 to the back surface of the back plate 20, supporting a drive pulley 84, and directly connecting to a pulse motor 74 via a shaft joint 76. As a result, the drive pulley 84 is rotated.
[0038]
Subsequently, the marking means 7 uses the blown air 38 for the defect portion based on the flaw detection result to cause the cutter 81 and the ink jet 51 to function, and the defect is held in the ultrasonic flaw detector main body 101 by traversing the formed body F. While reproducing the data, a ring-shaped mark is attached on the outer peripheral surface of the molded body F corresponding to the defect position. The cutter 81, the holder collar 82, the cutter arm 83, the contacting / separating cylinder 52c, the air blow 38, the ink jet 5, the front face is shown in FIG. 5, and the air blow 38 and the ink jet 39 are shown in FIG. As will be described later, this marking is configured such that the molded body F is raised to the second position P2.
[0039]
Submerged, flaw detected with ultrasonic probe 6, catches defect, determines defect, records and holds defective portion corresponding to the length direction, and in this case, flaw detection is performed by one reciprocating lateral feed and then rises above the tank Then, the cutter is made to function instead of the probe 6, and the previous defect record is reproduced again during one reciprocating lateral feed, and the cutter 81 is pressed to the corresponding defective position to form a groove. Then, ink is sprayed on the inner surface of the groove with the inkjet 39 to color.
[0040]
First, referring to FIG. 5, a mechanism in which the marking means 7 including the probes 6a and 6b, the cutter 81, the air blow 38, and the ink jet 39 is mounted on the base plate 58 and the lateral feed is suitably shared will be described. . The probes 6a and 6b and the marking means 7 are mounted on a slide plate 62 having a height changing portion 9 that can change the height in the vertical direction on a base plate 58 configured to be capable of lateral feed.
[0041]
Probes 6a and 6b are integrated with cylinders 52a and 52b, which switch the working position and standby position by expansion and contraction with height fine adjustment unit 10 interposed therebetween. 53a and 53b are provided and fastened.
[0042]
Next, the marking means 7 similarly mounts a cylinder 52c that switches between an operating position and a standby position by expansion and contraction on a slide plate 62 via a mounting bracket 53c, and provides a cutter arm 83 below the cylinder rod. As shown in the drawing, a groove is formed by pressing the round blade-shaped cutter 81 on the formed body F rotating for a predetermined timer time by the extension of the cylinder 52c and its force.
[0043]
A round blade cutter 81 is sandwiched and supported by holder collars 82 from both sides, and the cutter shaft is supported by a cutter arm 83 as a rotary shaft. The cutting edge is pressed against the surface of the rotating molded body F by the expansion and contraction of the cylinder 52c, and the outer periphery of the blade 52 makes a circle around it to make a ring-shaped scratch and perform marking.
[0044]
At the same time, the air blow gun 38 and the ink jet gun 39 attached to the cutter arm 83 are made to function to blow off water remaining in the vicinity of the groove, and water-resistant ink is applied onto the groove to be colored. In this order of operation, grooving and air blowing are performed for a predetermined time from the start of lowering of the cutter arm 83, and after that time, black ink is applied for a predetermined time by the ink jet gun 39 to form a ring-shaped mark.
[0045]
Next, an ultrasonic inspection method in which an inspection process is performed using an ultrasonic inspection apparatus that searches for internal defects of the above-described polyamide resin molded body from the outside will be described with reference to an operation block diagram of FIG. 1) First, in START, the mounting means 4 is at the P2 position above the water tank 3, the ultrasonic probes 6a and 6b and the marking means 7 are in the upper position as the cylinder 52c contracts and is at the left end standby position. Is filled with water and circulated.
[0046]
2) S1 is performed here (placement of the molded body). First, based on the outer diameter of the molded body F to be placed, the shaft core seat 12 is set to a predetermined mark on the gauge. Subsequently, the rod-shaped molded body F is laid across the biaxial rotating roll 15 of the mounting means 4 of the defect inspection apparatus 1 so that the right end surface of the molded body F is generally pressed by the core seating portion 12. It mounts so that it may contact | connect the rod 18 (refer P1 position of FIG. 1 as P2 position above a tank).
[0047]
3) Hereinafter, the process is automatically advanced until the completion of (marking) S9 with the activation of (cradle descending) S2. As the cradle 19 is lowered, the molded body F is placed and the mounting means 4 is submerged to the P1 position. Along with this submergence, the water that has been drained and overflowed the weir plate 25 is collected from a water supply outlet 27 to a water storage tank (not shown) provided below the water tank, and filtered from the water outlet 26 to the water tank 3 through the water supply outlet 26 .
[0048]
4) Subsequently, (molded body rotation) S3 starts, and the molded body F that has been submerged and inclined starts to skid by its own weight. Just the side slip is received by the core pushing rod 18 which is the tip of the shaft core seating portion 12. The pressed core push rod 18 is pressed by the built-in spring 55 and is detected by the sensor 93 in the abutting state. When (Sitting sensor: ON / OFF?) S4 is ON, it advances to the next process and does not turn ON. And (molded body rotation) S3 is continued.
[0049]
5) Next (probe traverse / flaw detection), the process enters S5. Since the seating sensor 93 confirms the positioning of the molded body F and is ready for flaw detection, flaw detection is executed. First, the probe 6a is laterally fed from the standby position to the left end position of the molded body F and stopped. First, the ultrasonic probe 6a is submerged and rotating, descends on the molded body F, and the holding wheel 42 is fixed with the two guide rollers 41 straddling the surface, and is mounted on the holding wheel 42. The ultrasonic probe 6a is set at a proximity position obtained in advance.
[0050]
Subsequently, since the flaw detection preparation is completed, it is laterally moved to a predetermined position at the other end at a predetermined speed determined in advance, and the entire outer surface is scanned and stopped. During this time, the defect position is held in correspondence with the lateral position. Next, in the return step, the ultrasonic probe 6a is contracted by the cylinder 52a, and instead the ultrasonic probe 6b is extended by the cylinder 52b and the ultrasonic probe 6b is set in proximity. Since the lateral positions of the probes 6a and 6b are different, the lateral position is reset, the probe 6a and 6b are returned to the original position while being scanned in the lateral direction, and the ultrasonic probe 6b is raised. At this time (flaw detection: completed / incomplete?) In S6, the completion is determined to be incomplete based on the scanning distance and the presence or absence of a control abnormality during this time, and when completed, the next step is performed.
[0051]
6) Then (molded body rise) enters S7. Here, the reverse operation of the cradle descending S2 is performed, and the P2 position is returned to when the cradle 19 is lowered. As a result of the defect inspection described above (defect: presence?), If it is present in S8, the process proceeds to the next (marking) S9, and if not (procedure of the molded body), the process proceeds to S10. However, in the defect inspection, if the number of defective parts is larger than a preset number, the marking is skipped and removed.
[0052]
7) Subsequently (marking) S9. Here, the cutter 81 is made to function in place of the above-described ultrasonic probes 6a and 6b, and marking is performed on the outer periphery of the position where the above-described ultrasonic probes 6a and 6b have detected a defect. In the lateral direction, the mounting positions of the ultrasonic probes 6a and 6b and the cutter 81 are different, so that the difference is corrected in the data so that the probe 6 and the cutter are at the same position. It stops at the defect position in the axial direction, and the marking cutter 81 is pressed and grooved for the pressing timer time.
[0053]
8) Next (unloading the molded body) In S10, the ultrasonic probes 6a and 6b and the marking means 7 are both stored in the upper position with the cylinder 52 contracted. return. As a result, the round bar which is opened at the top and lies on the mounting means 4 with a slight inclination can be taken out with bare hands or a handy hanging tool.
[0054]
In addition, in the method of the polyamide resin molding of this invention and its defect inspection apparatus, it is not limited to what is shown in FIGS. 1-8, For example, you may change and implement to the following forms.
1) An example of a manual change mechanism for a height changing portion that can be moved up and down according to the outer diameter of the resin molded body is related to the proximity installation portion of the ultrasonic probe. It is possible to use a mechanism that can automatically change the height by giving the outer diameter of the molded body as instruction data.
[0055]
【The invention's effect】
  In the defect inspection method for a polyamide resin molded body according to claim 1, the presence of a defect in the cross section of the molded body is visualized by marking applied to the defective portion without breaking, thereby preventing the outflow of the defective defect. soIn addition, the markings are not disappearing and are easily visible, so that oversight of defects by humans can be prevented and leakage of defects can be prevented.
[0057]
  Claim 2The polyamide resin molded product defect inspection system described in 1 can automatically perform machine scanning without human intervention, so inspection variations and exploration reliability are significantly improved and marking is reliable compared to inspections that rely on humans. It became possible to carry out early.
[0058]
  Claim 3In the polyamide resin molded product defect inspection device described in 3, the positioning of the polyamide resin molded product does not require troublesome positioning and can be monitored by a sensor, so the lateral accuracy improves and the marking accuracy is much higher. It got better.
[0059]
  Claim 4In the defect inspection apparatus for a molded article of polyamide resin described in 1), the lateral feed mechanism can be simplified without duplication, so that the apparatus can be made compact and inexpensive.
[0060]
  Claim 5In the defect inspection apparatus for a polyamide resin molded body described in 1), since the ring-shaped marking on the surface of the resin molded body is difficult to peel off and is colored, the presence / absence and location of the defect becomes clear at a glance and there is no oversight of the defect.
[0061]
  As described above, claims 1 to 1 of the present application.5The invention relating to the defect inspection method and the inspection apparatus for the polyamide resin molded article described can exhibit its function.
[Brief description of the drawings]
FIG. 1 is a front view of a defect inspection apparatus for a polyamide resin molded body according to the present invention.
FIG. 2 is a top view of FIG.
3 is a side view of FIG. 1, and is a cross-sectional view of a part of FIG. 2 as viewed from the direction AA.
FIG. 4 is a state diagram for explaining the proximity installation of a probe during flaw detection.
FIG. 5 is an explanatory diagram in which marking means and an ultrasonic probe are gathered on a slide plate.
6 is a detailed view of a shaft core seating portion, and is a detailed view of a part B of FIG.
FIG. 7 is a one-cycle process flow chart of a defect inspection method for a polyamide resin molded body according to the present invention.
FIG. 8 is an explanatory diagram of a marking state according to the present invention.
[Explanation of symbols]
F Polyamide resin molding
P1 1st position
P2 2nd position
1 Defect inspection equipment for polyamide resin moldings
4 Placement means
5 Lifting means
7 Marking means
8 Scanning means
9 Height change part
10 Height fine adjustment part
11 Horizontal feed section
15 Rotating roll
17 Rotating shaft
20 Backboard
25 Barrage
38 Air blow gun
39 Inkjet gun
42 holding car
58 Base plate
62 Slide board
81 cutter
93 sensors
101 Ultrasonic flaw detector body
103 Proximity installation section

Claims (5)

The internal defects of polymerized molded polyamide resin molded body cylindrical mold, when examining whether a defect using the ultrasonic flaw detection method,
While the polyamide resin molded body is submerged in water and rotated at a constant speed, an ultrasonic probe is brought close to the outer surface of the polyamide resin in the water so that an ultrasonic wave is incident, and the resin molded body is axially fixed from one end to the other end. The entire outer surface is scanned at high speed to detect an ultrasonic wave reflected from an internal defect located inside the resin molding, and a groove is formed on the outer surface of the polyamide resin molding on the outer surface of the defective portion. chopped in a defect inspection method of the polyamide resin molding, characterized in that to visualize the presence or absence of a defect invisible inside performing marking is colored in the groove portion. In exploring the internal defects of a polyamide resin molded body polymerized with a cylindrical mold using an ultrasonic flaw detector,
A water tank in which the polyamide resin molded body can be submerged, a plurality of parallel rotatable two-axis rotating rolls circumscribed on the lower surface side of the resin molded body that is horizontally placed and rotated, and the resin on at least one end surface Seating means for suppressing lateral displacement in the axial direction due to rotation of the molded body, a placing means that can be submerged in the water tank, a first position where the polyamide resin molded body is submerged, and a second that can be easily put in and out of the water tank. Elevating means that can change the position, the proximity installation part of the ultrasonic probe straddling the outer peripheral surface of the rotating resin molded body, and the height changeable up and down according to the outer diameter of the resin molded body A scanning means having a height adjusting portion that absorbs the outer diameter variation and the laterally feeding portion that can be fed in the axial direction of the resin molding, and the lifting means is raised to the second position after the flaw detection is completed. mer by pulling the resin molded body Defect inspection apparatus of the polyamide resin molded body characterized by providing the facilities to the marking means ring. The placing means described above inclines two parallel horizontal shafts integrally, places the resin molded product between the two shafts and places the resin molded body to center the axis, and further, the lower end side of the tilted axis The defect inspection device for a polyamide resin molded body according to claim 2 , further comprising a seat portion that is freely rotatable, and performing positioning in the length direction. The defect inspection apparatus for a polyamide resin molded body according to claim 2 , wherein the marking means is provided so as to be shared with a lateral feed portion of the ultrasonic probe. 5. The defect inspection apparatus for a polyamide resin molded body according to claim 2 , wherein the marking means comprises a cutter for attaching a groove and an ink jet coloring the inner surface of the groove.

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