JPH0645092B2 - Suction removal method - Google Patents

Description

The present invention relates to a method of sucking and removing an object housed in a hole by utilizing a pressure difference.

[Conventional technology]

A clad pin in which a bonding material such as silver is welded to the head of the lead pin is used as a lead for a PGA (Pin Grid Array), and the process for manufacturing such a clad pin is as follows. .

Prepare a tray in which a large number of holes having substantially the same shape as the lead pins are formed in a grid pattern, and insert one lead pin into each hole of this tray with the head located on the opening side of the hole, One silver grain (bonding material) is placed on the head of each lead pin. Next, a tray containing a large number of sets of lead pins and silver particles is carried into a heating furnace and heated at a high temperature. Then, the silver particles are heated, and due to the surface tension, they are fused in a hemispherical shape to the head of the lead pin to become a silver solder, and a clad pin is manufactured.

By the way, when the tray is carried into the heating furnace, silver particles fly out from one hole and enter or disappear into another hole to produce a clad pin in which two or more silver particles are welded, or no silver particles at all. There are cases where a clad pin that does not weld is manufactured.

Therefore, it is necessary to judge normality / abnormality of a large number of manufactured clad pins and remove the abnormal clad pin from the tray. The removal method is to detect the abnormal clad pin while scanning the suction nozzle. A non-contact method of suctioning and removing from the tray can be considered.

[Problems to be Solved by the Invention]

When the object stored in the hole is sucked in a non-contact manner as in the above-described example, it is necessary to completely bring the suction port into close contact with the hole. By the way, when trying to remove an abnormal clad pin as in the example described above, when sucking an object (clad pin) while scanning the suction nozzle, it is necessary to ensure the degree of adhesion to the hole of the suction port. Is mechanically difficult. As a result, it is difficult to stably suck the abnormal clad pin from the suction port of the suction nozzle, and it is efficiently removed from the tray by moving it through the lumen of the suction nozzle to the outside of the suction nozzle. It was impossible.

The present invention has been made in view of the above circumstances, and provides a suction removal method capable of performing stable suction removal even when performing scanning suction by providing a notch at the tip of the suction port. The purpose is to do.

[Means for Solving the Problems]

The suction removal method according to the present invention is a suction method for sucking an object stored in a hole from a suction port of a suction nozzle by utilizing a pressure difference, and moving and removing the object through a lumen of the suction nozzle to the outside of the suction nozzle. In the removal method, the suction nozzle has an opening for sucking the object in the central portion of the tip surface facing the object, and is configured to have a suction port radially provided with notches around the object, and the air is provided above the object. It is characterized in that a portion with a high flow velocity is generated to exert buoyancy on the object, and the object is sucked from the opening by the air flow flowing into the opening through each notch generated as the floating object approaches the suction port. To do.

[Action]

In the present invention, the object in the hole is sucked by the suction nozzle having a notch formed at the tip of the suction port. Then, at the time of suction, a part with a high air velocity will occur in the upper part of the object,
Buoyancy acts on an object. Then, at the moment when the object floats due to this buoyancy, a large amount of air flows in through the notch, the object is sucked by the flow of the air, and is moved to the outside of the suction nozzle through the lumen of the suction nozzle.

〔Example〕

Hereinafter, the present invention will be specifically described with reference to the drawings illustrating the embodiments. In the present embodiment, a case will be described in which an abnormal item in the clad pin is removed by suction from the tray.

FIG. 1 is a schematic view showing an implementation state of the method of the present invention. In FIG. 1, reference numeral 10 denotes a tray in which a clad pin has been manufactured and then carried out from a heating furnace to detect an abnormal product. The tray 10 has a large number of holes in a grid pattern, and each of the holes accommodates one clad pin 11 that has been manufactured and determined to be normal or abnormal. The tray 10 is placed on a removal stage 13 that can be moved in the XY directions (left-right direction and front-back direction in FIG. 1) under the control of the position controller 12, and can be moved integrally with the removal stage 13 in the XY directions. Is.

Above the tray 10, there is provided a removing unit 1 composed of, for example, 16 suction nozzles 1a, 1a, ... Nozzle 1
a, 1a, ... slide the tray 10 over the tray 10 side
Abnormal clad pin suction is performed on each of the six equally divided regions. Further, each suction nozzle 1a of the removing unit 1 is connected to a collection tank 2 for accumulating the abnormal product that has been moved and removed to the outside of the suction nozzle 1a through the lumen of the suction nozzle 1a.

FIG. 2 is a cross-sectional view of the tip of the suction nozzle 1a on the suction port side. The suction nozzle 1a of the present invention has a tip on the suction port side, that is, when the suction port faces the clad pin. Notches 1b each having a radial, specifically, cross-shaped notch are formed over a wider area than the pin 11. The cross-shaped cut is formed symmetrically with respect to the lumen of the suction nozzle 1a.

A vacuum solenoid valve 3 to which positional information of an abnormal product is input from an abnormal product detection device (not shown) is connected to the collection tank 2, and the vacuum solenoid valve 3 forms a vacuum state in a vacuum generation unit 4
Are connected. Then, based on the abnormal item position information from the abnormal item detection device, the pressure in the suction nozzle 1a 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 10 containing a large number of clad pins manufactured in a heating furnace and judged to be abnormal or normal is transferred onto the removal stage 13 by a transfer means (not shown).

Next, the position controller 12 is driven to move the removal stage 13 (tray 10) and position the 16 suction nozzles 1a, 1b ... Above the corresponding holes. Then, based on the position information of the abnormal product input to the vacuum solenoid valve 3, the pressure in the corresponding suction nozzle 1a is sequentially reduced to 300 to 400 mmHg by the action of the vacuum generation unit 4. That is, the pressure in the suction nozzle 1a corresponding to the position of the clad pin determined to be an abnormal product is reduced. Then the corresponding suction nozzle 1a
An abnormal clad pin in the hole of the tray 10 is sucked into the inside. The sucked abnormal clad pin is carried into the collection tank 2 through the suction nozzle 1a and accumulated in the collection tank 2.

The action during the inhalation is as follows. Since the notch 1b is formed at the tip of the suction nozzle 1a, a portion with a high air flow velocity occurs in the upper part of the clad pin,
Buoyancy acts on the clad pin. At the moment when the clad pin floats by this buoyancy, a large amount of air flows into the suction nozzle 1a from the notch 1b, and the clad pin is completely sucked by the flow of this air. At this time, cutout 1b
Is formed symmetrically with respect to the lumen of the suction nozzle 1a, so that the clad pin is sucked upward without any trouble.

In this manner, all the abnormal clad pins on the tray 10 are sucked and removed while sliding the 16 suction nozzles 1a, 1a ... On the surface of the tray 10. As described above, in the present invention, stable suction can be performed without completely bringing the suction port of the suction nozzle into close contact with the hole of the tray during suction.

In the present embodiment, the notches are formed by the cross-shaped notches, but the shape, number, etc. of the notches are not limited to the configuration of the embodiment, and the inhalation action described above is realized. The shape and the number can be arbitrarily selected as long as the configuration is possible. However, in order to stably realize the inhalation action described above, it is desirable that the structure be symmetrical with respect to the lumen of the suction nozzle.

Further, in the present embodiment, the case where the abnormal clad pin is sucked and removed from the hole of the tray has been described, but the present invention is not limited to this, and other objects housed in the hole can of course be performed in the same manner as in this embodiment. .

When the method of the present invention is compared with the conventional scanning suction method in which suction is performed after the suction port is completely attached to the hole, the suction time per object is 500 msec at the suction pressure of 400 mmHg in the conventional method.
However, in the method of the present invention, the pressure at inhalation is 400 mmHg.
It was 30 msec, and the inhalation time was significantly reduced, and it was found that the method of the present invention enables stable high-speed inhalation.

〔The invention's effect〕

As described in detail above, in the present invention, since the notch is formed at the tip of the suction port, even when performing scanning suction, the suction port is stable without being brought into complete contact with the hole.
Moreover, the present invention has excellent effects such that high-speed suction is possible and the device configuration is simple.

[Brief description of drawings]

FIG. 1 is a schematic view showing an implementation state of the suction removal method of the present invention, and FIG. 2 is a cross-sectional view of a tip end portion of a suction nozzle used in the method of the present invention on the suction port side. 1 ... removal part, 1a ... suction nozzle, 1b ... notch,
2 ... Collection tank, 3 ... Vacuum solenoid valve, 4 ... Vacuum generator, 10 ... Tray, 11 ... Cladding pin, 12 ... Position controller, 13 ... Removal stage

Claims (1)

[Claims] 1. A suction removal method for sucking an object contained in a hole from a suction port of a suction nozzle by utilizing a pressure difference, and moving and removing the object through a lumen of the suction nozzle to the outside of the suction nozzle. The suction nozzle has an opening for sucking an object in the center of the tip end surface facing the object, and a suction port with radial cutouts around the opening. And a buoyancy force is applied to the object, and the object is sucked from the opening by an airflow flowing into the opening through each notch generated as the floating object approaches the suction port. .