JP2632353B2 - Abnormal product removal method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an abnormal product removing method for detecting and removing an abnormal product from a large number of products manufactured collectively such as clad pins. is there.

[Conventional technology]

As the use of lead, such as for the PGA (P in G rid A rray ),
A clad pin in which a bonding material such as silver is welded to the head of the lead pin is used, and FIG. 2 is an enlarged plan view of the clad pin. The cladding pin 10 has a hemispherical bonding material 12 made of silver on the bottom surface of the head 11b of the lead pin 11 composed of a thin cylindrical shaft 11a and a disk-shaped head 11b having a diameter larger than the shaft 11a. It has a welded configuration. The process of manufacturing such a clad pin is as follows.

Prepare a tray in which a large number of holes having substantially the same shape of the lead pins are formed in a lattice shape, and fit the lead pins one by one into each hole of this tray with the head positioned on the opening side of the hole, One silver particle (joining material) is placed on the head of each lead pin. Next, the tray storing a large number of sets of lead pins and silver grains is carried into a heating furnace and heated at a high temperature. Then, the silver grains are heated, and are hemispherically welded to the heads of the lead pins as shown in FIG. 2 by surface tension to become silver solder, thereby producing clad pins.

By the way, when a tray is carried into a heating furnace, silver particles fly out of a hole and enter or disappear in another hole, so that a clad pin in which two or more silver particles are welded is produced, or a silver particle is produced. In some cases, a clad pin that does not adhere to the metal is produced. Therefore, it is necessary to inspect the capacity of the deposited silver particles in each of the large number of manufactured clad pins to remove abnormal clad pins.

Conventionally, as a method of inspecting the capacity of silver grains, a method of visually inspecting, or a method of selecting an excess capacity through a predetermined interval has been known.

[Problems to be solved by the invention]

However, in the inspection method as described above, since each clad pin is inspected one by one, there is a disadvantage that it takes a long time to inspect many clad pins.

The present invention has been made in view of such circumstances, and an allowable range obtained by measuring management items and positions of a large number of products by processing images simultaneously photographed by a camera and obtaining the measurement items based on measured values of the management items. Detection and removal of abnormal products for the control items (silver grain capacity) without contact, even for clad pins with a small silver grain capacity, for example, by detecting and removing products that are out of range as abnormal goods. It is an object of the present invention to provide a method for removing abnormal products.

[Means for solving the problem]

The abnormal product removing method according to the present invention is an abnormal product removing method for detecting and removing an abnormal product based on a predetermined control item from a large number of products manufactured collectively. Simultaneously shoot the product using a camera,
The individual management items and their positions are measured for each product by processing the photographed images, a histogram is created from the measured values and the total number of the management items of all products related to the photographing, and the allowable range of the management items is based on the histogram. ,
It is characterized in that a product out of the allowable range is detected as an abnormal product, and the abnormal product is removed based on the measured position information.

[Action]

In the abnormal product removing method of the present invention, the management items and their positions are simultaneously measured by image processing for each manufactured product. Next, a histogram is created using the measurement values of the management items based on the measurement values of the management items, and an allowable range of the management items is obtained based on the histogram,
Products out of the allowable range are detected as abnormal products, and are removed based on the position information of the abnormal products.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to the drawings showing the embodiments. In this embodiment, a case where an abnormal product in the clad pin is detected and removed will be described.

FIG. 1 is a schematic view of an apparatus for carrying out the method of the present invention. In FIG. 1, reference numeral 13 denotes a tray carried out of a heating furnace after clad pins have been manufactured. The tray 13 has a large number of holes in a lattice shape, and each of the holes stores one manufactured clad pin 10. The tray 13 is first placed on an inspection stage 20 which can be moved in XY directions (horizontal direction and front and back directions in FIG. 1) by driving means (not shown), and is then conveyed by conveying means (not shown) to be similar to the inspection stage 20. It is mounted on a removal stage 30 movable in the XY directions. The tray 13 has an inspection stage 20 and a removal stage 30.
And can be moved in the XY direction integrally.

A light source 1 is provided diagonally above the inspection stage 20, and a bonding material (silver grains) 12 is provided above the inspection stage 20.
In a mode in which this optical axis is perpendicular to the welding surface of, for example, a CCD
(C harge C oupled D evice) camera 2 consisting of a camera
Is provided. By the illumination from the light source 1, surface images of the heads of the clad pins 10 are captured by the camera 2.

The camera 2 is connected to an image processing device 3 for processing a surface image obtained by the camera 2. The image processing device 3 determines the imaging area of the bonding material of each clad pin based on the surface image from the camera 2. The information and the position information of each clad pin are output to the abnormal product detection device 4. The abnormal product detection device 4 detects an abnormal product based on information from the image processing device 3 and outputs position information of the abnormal product to the vacuum solenoid valve 7 described later.

Above the removal stage 30, a removal unit 5 including a plurality of suction nozzles 5a, 5a,... Is provided in a state where the suction port is substantially in contact with the tray 13, and each of the suction nozzles 5a, 5a,
.. Perform suction of an abnormal clad pin in each region equally divided into the tray 13 while sliding on the surface of the tray 13. Each of the suction nozzles 5a, 5a,... Of the removing unit 5 is connected to a collection tank 6 that stores the sucked abnormal product. A vacuum solenoid valve 7 is connected to the collection tank 6, and a vacuum generating unit 8 for forming a vacuum state is connected to the vacuum solenoid valve 7.
Based on the position information of the abnormal product from the abnormal product detection device 4, the pressure in the suction nozzle 5a positioned at the corresponding position is reduced, and the abnormal clad pin at that position is sucked. .

 Next, the operation will be described.

First, the tray 13 containing a large number of clad pins manufactured in the heating furnace is placed on the inspection stage 20. The inspection stage 20 (tray 13) is moved, and the plurality of clad pins 10 located below the camera 2 are irradiated with light from the light source 1, and the camera 2 images the heads of the plurality of clad pins 10.

The image obtained by the camera 2 is input to the image processing device 3 to perform the following image processing. First, the input image is binarized, and the binarized image for each clad pin is
A unique number is labeled for each clad pin. The imaging area of the bonding material for each clad pin and the position (XY coordinate) of each clad pin are measured based on each of the labeled binary images. Then, the measured imaging area and position information are output to the abnormal product detection device 4.

As described below, the abnormal product detection device 4 detects an abnormal clad pin from the input information and outputs the position information of the abnormal product to the vacuum solenoid valve 7. First, a histogram is created at an appropriate class interval based on the inputted area information of each clad pin and the total number thereof, and then an allowable range of the area information is calculated based on the created histogram.
It is determined whether or not the area value of each clad pin falls within the allowable range, the contained clad pin is determined to be non-defective, and the off-cladding pin is determined to be abnormal. Then, the position information of the clad pin determined to be abnormal is output to the vacuum solenoid valve 7.

When the surface image is captured, the tray 13 containing a large number of clad pins is transported by transport means (not shown), and is placed on the removal stage 30.

Move the removal stage (tray 13) 30 and use the suction nozzle
Position 5a, 5a, ... above the corresponding hole. Based on the position information of the abnormal product input to the vacuum solenoid valve 7, the pressure in the suction nozzle 5 a corresponding to the position of the clad pin determined to be the abnormal product is sequentially reduced by the action of the vacuum generating unit 8. Then, the abnormal clad pin is sucked from the hole of the tray 13. The sucked abnormal clad pin is
It is conveyed to the collection tank 6 through the inside of 5a and accumulated in the collection tank 6.

In this embodiment, the imaging area of the bonding material is measured by image processing, and the capacity of the bonding material is inspected based on the imaging area. Therefore, even if the bonding pin has a small capacity, the capacitance can be accurately inspected. can do.

In addition, since the clad pins are inspected in a non-contact manner, there is no possibility that the clad pins may be damaged due to the inspection.

In addition, since the binarized image for each clad pin is labeled, a large number of clad pins can be inspected at the same time, and the inspection time can be reduced.

In addition, since the stage for detecting an abnormal product and the stage for removing the abnormal product are separated, the inspection process and the removal process can be performed in parallel, so that the detection and removal processes can be speeded up and online. Is possible.

Since the population is formed based on the measured area values, it is unnecessary to set the allowable range (population) of the management item for each production unit.

In this embodiment, the case where an abnormal clad pin is detected and removed has been described, but it is a matter of course that the present invention is not limited to this.

〔The invention's effect〕

As described in detail above, in the method of the present invention, a large number of products manufactured in a lump are simultaneously photographed using a camera, and individual management items and positions of the products are measured by processing the photographed images, A histogram is created from the measured values of the management items of all the products related to the photographing and the total number thereof, an allowable range of the management items is obtained based on the histogram, products out of the allowable range are detected as abnormal products, and the measured positions are determined. Since the method is characterized by removing the abnormal product based on the information, it is possible to perform a large number of inspections in a short time.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an embodiment of the method of the present invention, and FIG. 2 is an enlarged plan view of a clad pin. 1 light source 2 camera 3 image processing device 4
... abnormal product detection device, 5 ... removal unit, 5a ... suction nozzle, 6 ... collection tank, 7 ... vacuum solenoid valve, 8 ... vacuum generation unit, 10 ... clad pin, 12 ... joining Material 13 Tray 20 Inspection stage 30 Removal stage

Claims (1)

(57) [Claims] 1. An abnormal product removing method for detecting and removing an abnormal product from a large number of products manufactured collectively based on a predetermined control item, wherein the multiple products manufactured collectively using a camera. In the same way, the individual management items and their positions are measured for each product by processing the captured image, and a histogram is created from the measured values and the total number of the management items of all products related to the imaging, and the histogram is created. A method for removing an abnormal product, comprising: obtaining an allowable range of a management item based on the information; detecting a product out of the allowable range as an abnormal product; and removing the abnormal product based on measured position information.