JP2876486B2 - Punch inspection device for rotary press - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an apparatus for inspecting a punch of a rotary press used for manufacturing a press-formed product such as a ferrite core.

(Summary of the Invention) The present invention relates to a punch inspection apparatus for a rotary press used for manufacturing a press-molded body such as a ferrite core, which compares an image of a punch with a correct punch image without any abnormality. This configuration detects an abnormality of a punch, and enables early detection of an abnormality such as chipping or deformation of the punch, thereby reducing defective products.

(Prior Art) Conventionally, as a device for manufacturing a pressed body such as a core by pressing a material powder such as a ferrite, the filling of the material powder,
A rotary press that automatically performs pressure molding and removal of a molded body is disclosed in Japanese Patent Publication No. 55-23719. In such a rotary press, a plurality of mortars are provided on the same circumference of a rotatably provided rotating disk, and an upper punch and a lower punch are provided above each mortar so as to fit into each of the mortars. A lower punch is provided.

Then, a fixed amount of a material powder such as ferrite is filled in a state where the lower punch is fitted to the die, and the powder is pressed from above and below with the upper punch and the lower punch to perform pressure molding. Each of the steps of filling the material powder, scraping the excess material powder, press molding, and taking out the molded body is performed continuously by rotating the rotating disk.

(Problems to be Solved by the Invention) In the conventional rotary press, a die is filled with a material powder and pressed by an upper punch and a lower punch to perform pressure molding. Even if it is mixed into a molded product, it cannot be detected immediately, and the finished product may be defective in lot units. In addition, there is a problem that chipping or deformation of the punch causes a defective outer shape of the product.

In view of the above, an object of the present invention is to provide an apparatus for inspecting a punch of a rotary press capable of early detecting an abnormality such as chipping of an edge of the punch of a rotary press and reducing the number of defective products.

(Means for Solving the Problems) In order to achieve the above object, a punch inspecting apparatus for a rotary press according to the present invention comprises a punch which can be inserted into a die on a rotating disk side,
Imaged by a camera by illuminating away from the mortar, the captured image captured by the camera is compared with a master image showing a correct punch image by comparison means, and when both are different, The captured image is stored in an image memory, and coincidence detecting means detects whether or not two or more captured images of the same punch stored in the image memory match each other.

(Operation) In the punch inspection device of the rotary press of the present invention,
Since the punch inspection of the rotary press becomes possible, even if an abnormality such as chipping of the edge of the punch occurs at the time of manufacturing and a defective product is generated, it is possible to detect the abnormality at an early stage and to easily identify the defective product. That is, it is not necessary to make a defect on a lot basis as in the conventional apparatus, and the number of defective products can be reduced.

(Embodiment) Hereinafter, an embodiment of a punch inspection apparatus for a rotary press according to the present invention will be described with reference to FIG. 1 to FIG.

1 and 2 show a schematic configuration of a rotary press. In these figures, 1 is a rotating disk in the rotary press, 2 is a die, 3 is an upper punch, 4
Indicates a lower punch. A plurality of dies 2 are provided on the same circumference of the rotatably supported rotating disk 1 at equal angular intervals, and the dies 2 are placed above and below each of the dies so as to be freely fitted into the respective dies. A punch 3 and a lower punch 4 are provided, respectively. The mortar 2 and the corresponding upper punch 3 and lower punch 4 move with the rotation of the rotary disk 1. Then, a powder supply unit 5 for filling the material powder on the circumference passing through the die 2, a powder stopper 6 for scraping off excess material powder, and an upper punch 3 and a lower punch 4 are press-formed. A product take-out section 7 for taking out the molded body is provided.

In FIG. 1, an arrow P near the outer peripheral portion of the rotating disk 1 indicates a mounting range of the upper punch imaging camera (that is, a range in which the upper punch is away from the mortar and above), and an arrow Q indicates the lower punch imaging camera. The mounting range (that is, the range in which the lower punch is separated from the mortar and located below) is shown.

FIG. 3 shows a configuration for creating a captured image of the upper punch 3 or the lower punch 4, and the CCD camera 8 in FIG. For imaging of the lower punch, it is installed in the range of arrow Q.
Mirrors (for example, plane mirrors) 9A and 9B for reflecting the image of the punch to the camera 8 in the range of P and Q are provided for the upper punch 3 and the lower punch 4, respectively, and can irradiate the punches 3 and 4 respectively. A strobe lamp 10 is installed at the position. Reference numeral 11 denotes a strobe drive circuit, reference numeral 12 denotes an image processing device for receiving a video signal from the CCD camera 8, and reference numeral 13 denotes a TV monitor for receiving an output signal of the image processing device (that is, an image captured by the camera).

FIG. 4 shows an output signal (captured image) of the image processing device 12.
23 shows a configuration of an inspection circuit for determining whether the upper punch 3 or the lower punch 4 is good or not by using an exclusive OR circuit 23 as a comparing means. It has a function of comparing with a master image 22 showing a correct punch image without abnormality such as chipping, deformation, bending, and the like, and outputting a captured image 21 to a subsequent image memory 24 only when both are different. . The image memory 24 is n (n is an integer of 2 or more) is composed of a memory unit 24 ₁ to 24n of. The output of each memory section is applied to an AND circuit 25 as coincidence detecting means.

Next, the operation of the above embodiment will be described. First, in FIG. 3, a specific lower punch 4 corresponding to a specific one of a plurality of mortars among a plurality of CCD cameras 8 arranged in the range of arrow Q in FIG. 1 using a mirror 9A. The case of imaging is described. When the punch 4A comes to the position where the mirror 9A and the camera 8 are installed (in the range of the arrow Q in FIG. 1), the strobe lamp 10 is turned on by the strobe driving circuit 11, and the punch 4A is irradiated with light. The light is reflected by 9A, enters the camera 8, and is imaged. The image of the punch picked up by the camera 8 is processed by the image processing device 12 and output to the TV monitor 13 and the inspection circuit of FIG. 4 as a captured image. The captured image is displayed on the TV monitor 13. The lighting timing of the strobe lamp 10 is set, for example, so as to be turned on when the specific lower punch 4 reaches a position where the camera 8 can capture an image.

The captured image 21 output from the image processing device 12 is subjected to a comparison process together with the master image 22 by an exclusive OR circuit 23 as a comparison unit. During the period in which the master image 22 that is the correct punch image matches the captured image 21, there is no output from the exclusive OR circuit 23, indicating that no abnormality has been detected.

If the master image 22 which is a correct punch image and the captured image 21 are different for some reason, the captured image 21 is output to the next image memory 24 and the first memory unit 24 ₁ of the image memory 24 is output. Is stored as a first memory image. When the second captured image 21 of the same punch captured at the next lighting timing of the strobe lamp 10 is different from the master image 22, the second captured image 21 is stored in the second memory unit 24. ₂ is stored as a second memory image. Thereafter, stored as third to n memory image sequentially third and subsequent memory unit 24 ₃ to 24n each time a same punch captured image 21 captured for each lighting of the flash lamp 10 is different from the master image 22 Is done.

Each output of the memory unit 24 ₁ to 24n (first to n memory image) is applied to the AND circuit 25 as a match detecting means, the AND circuit 25 determines whether each memory image match. The AND circuit 25 outputs the abnormality detection image 26 only when the respective memory images match each other. That is, the punch which seems to be abnormal is repeatedly imaged, and it is determined whether or not the n memory images different from the master image 22 coincide with each other. Recognize. Where AND
The reason for providing the circuit 25 is that even when the material powder temporarily adheres to the punch, there is a possibility that the captured image 21 and the master image 22 may be different, but in that case, This is because we focused on the fact that multiple memory images did not match, and if the material powder temporarily adhered to the punch by detecting mutual matches between the memory images with the AND circuit 25, it was considered that the punch was abnormal. Prevents misidentification. The captured image 21 finally determined to be abnormal is the abnormality detection image
Output to TV monitor etc. as 26.

In the description of the operation of Mr. Jin, the case where the image of the lower punch 4 is captured by the camera 8 with the mirror 9A has been described. However, the mirror 9B is arranged as shown by the imaginary line in FIG. With the CCD camera 8 provided, an image of one specific upper punch 3 corresponding to a specific one of the plurality of mortars can be similarly captured and processed. However, when performing the inspection of both the upper punch and the lower punch, it is necessary to install at least two sets of the camera 8, the mirror, and the strobe lamp 10 for the upper punch and the lower punch.

In addition, as for the inspection order of each punch, in addition to the method of repeating the inspection for one punch at least n times, and then performing the same number of inspections for the next punch and shifting the punches to be inspected sequentially, By providing several sets of image memory 24, one punch for all punches corresponding to each die
The second image capture was performed, and the second, third,
.., It is also possible to perform the n-th image capture and perform the inspection. The lighting timing of the above-described strobe lamp 10 is set in accordance with the above-described method.

Items that can be inspected by this inspection apparatus are (1) chipping and deformation of the edge of the upper punch, (2) chipping and deformation of the edge of the lower punch, (3) bending of the upper punch (center shift), and (4) lower (5) Sorting of different types of punches (in the case where an unsuitable punch is mounted on a die due to an operator's error), and the like.

(Effects of the Invention) As described above, according to the punch inspection apparatus for a rotary press of the present invention, the punch inspection of the rotary press can be executed by image processing, and an abnormality of the punch can be detected at an early stage. For example, even if a defect occurs in the product due to an abnormality such as chipping of the edge of the punch at the time of manufacturing, early detection of the abnormality of the punch makes it easy to identify the defective product, and the finished product does not become defective in lot units. And the number of defective products can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic plan view of a rotary disk portion of an embodiment of a rotary press punch inspection apparatus according to the present invention, and FIG. 2 is a cross-sectional view of a main portion showing a die shape and upper and lower punch portions of the rotary press in the embodiment. FIG. 3 is a configuration diagram showing a configuration for capturing an image of a punch in the embodiment, and FIG. 4 is a block diagram showing an inspection circuit portion for processing the captured image in the embodiment. 1 ... Rotating disk, 2 ... Mold type, 3 ... Upper punch, 4 ... Lower punch, 5 ... Powder supply unit, 6 ... Powder stopper, 7 ...
Product take-out part, 8 …… Camera, 9A, 9B …… Mirror, 10 ……
Lamp strobe, 11 Strobe drive circuit, 12 Image processing device, 13 TV monitor, 21 Captured image, 22
Master image, 23 ... Exclusive or circuit, 24
…… Image memory, 25… AND circuit, 26… Abnormality detection image.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B30B 11 / 08,15 / 00 G01B 11/30

Claims (1)

(57) [Claims] An image of a punch that can be fitted into a die on a rotating disk side is illuminated while being away from the die, and an image is taken by a camera. A comparison is made between the master image and the master image shown in the table. If the two images are different from each other, the captured image is stored in the image memory, and two or more captured images of the same punch stored in the image memory are mutually recognized. A punch inspection apparatus for a rotary press, wherein coincidence is detected by coincidence detection means.