JPH06254496A - Classification of fine metal spheres - Google Patents

Abstract

PURPOSE:To efficiently and accurately classify small metal particles with a predetermined sphere size by a method wherein a plate material is provided so as to be separated from a screen net by an almost sphere size upper limit value in the classification of small metal spheres made of Pt for a medical treatment device and the small metal spheres classified through the screen net are collected to exclude different shape matter. CONSTITUTION:For example, when a cylindrical screen net 1 with a mesh size of 60mum is used as a screen net having the upper limit of a sphere size, an unperforated cylindrical plate material 2 is arranged so as to form a gap of an almost sphere size upper limit value, for example, 65mum between the plate material 2 and the screen net. Small metal spheres classified through a screen net with a mesh size of 50mum are charged in the screen net 1 from an opening 5 to be subjected to up-and-down motion and rotary motion and classified from the gap 4. At this time, a rod-shaped different material is caught between the screen net 1 and the plate material and not passed through the gap 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a jig for selecting metal microspheres, and more particularly to Pt, PtIr alloys used in medical devices such as heart pacemakers and Au, Au alloys used for semiconductor electronics such as bumps. The present invention relates to classification of microspheres made of Ag and Ag alloy used for electric contacts and the like.

[0002]

2. Description of the Related Art Conventionally, classification of small spheres having a predetermined diameter from small spheres produced by the atomizing method or the thermal spraying method has been carried out by using a sieve mesh or the like. The efficiency and workability were poor, and the accuracy was poor. In particular, in order to meet the specifications of the true spherical microspheres, it is necessary to further screen the profiled material (rod-shaped, flat-shaped, etc.) as a final inspection after classification, resulting in poor efficiency and accuracy.

[0003]

It is an object of the present invention to provide a method for classifying metal microspheres having a predetermined spherical diameter with high efficiency and accuracy by eliminating deformed materials such as rod-shaped and flat-shaped materials.

[0004]

According to the present invention, a plate material is separated from a sieving net by an approximately upper limit value in classification with a sieving net having an upper limit value after performing classification with a sieving net having a lower limit value of a desired spherical diameter. Is provided to classify and collect the metal microspheres that have been classified by passing through a sieve net.

In still another invention, a sieving net having a sieving diameter of the upper limit value and a sieving net having a sieving diameter of the lower limit value are used after classifying by arranging plate materials at intervals substantially equal to the upper limit value. It is characterized by classifying, classifying and collecting metal microspheres.

[0006]

According to the method for selecting metal microspheres of the present invention configured as described above, the plate material is separated from the sieving net by a value of about the upper limit value, and the plate material is classified. The bar-shaped, flat-shaped, and other shaped materials cannot be caught and cannot pass through. Therefore, only the metal microspheres having a desired spherical diameter from the lower limit value to the upper limit value can be efficiently and accurately classified and collected.

Further, according to the method for selecting metal microspheres of still another aspect of the invention, classification is performed by providing a sieve net having a sieving diameter of an upper limit value and a plate material at a distance substantially equal to the upper limit value. A bar-shaped or flat-shaped profiled material cannot be caught and cannot pass, and metal microspheres having an upper limit value or less are classified. Then, after that, the particles are classified by a sieving net having a lower limit sieve diameter, so that only the metal microspheres having a desired spherical diameter from the lower limit value to the upper limit value can be efficiently and accurately classified and collected. In addition, it is desirable to appropriately remove them in order to prevent a decrease in efficiency due to the clogging of an irregular shape in the sieve mesh.

[0008]

EXAMPLES Examples will be described below. First, as an example, FIG. 1 shows a cylindrical sieving jig having an upper limit sieving net. 1 is a cylindrical sieve mesh with a mesh diameter of 60 μm, 2 is a cylindrical plate material without holes, and the distance between 1 and 2 is 65 μm,
The clearance is open at the bottom 4. 3 is a disc with no holes, 4 is the above 1, sieving net and the above 2, gap between plate material,
In No. 5, the lid is closed after the metal microspheres classified at the opening are put therein. First, put the metal microspheres classified by a sieving net with a mesh diameter of 50 μm into the jig and rotate it while vertically moving or tilting it with an operating device (not shown) to collect it from the skimmer 4. I did the classification. However, it was possible to sort and collect metal microspheres of 50 to 60 μm efficiently and accurately. As shown in FIG. 2, the rod-shaped or flat-shaped profiled material 6 cannot be caught and cannot pass, and the metal microspheres 7
Was able to pass smoothly as indicated by the arrow.

[0009]

As described above, according to the method for selecting metal microspheres of the present invention, the rod-shaped and flat-shaped profiled materials can be eliminated by the plate material provided with the sieve mesh and the space therebetween, so that the efficiency can be improved.
It has an excellent effect that classification can be performed accurately.

[Brief description of drawings]

FIG. 1 is a view showing a cross section of a cylindrical classification jig including a sieve mesh and a plate material according to an embodiment of the present invention.

FIG. 2 is an enlarged view of an essential part showing a state of classification and catching in FIG.

[Explanation of symbols]

 1 Cylindrical sieving net 2 Cylindrical plate material 3 Disc 4 Clearance between sieving net and plate material 5 Opening part for closing the lid 6 Deformed material 7 Metal microspheres

Claims (2)

[Claims] 1. In classifying with a sieving net having an upper limit value after performing classification with a sieving net having a desired lower limit value of a spherical diameter, a plate material is provided apart from the sieving net by an approximately upper limit value, and sieved. A method for selecting metal microspheres, which comprises classifying and collecting metal microspheres that have been classified through a net. 2. A sieving net having an upper limit sieving diameter,
The metal microspheres are characterized by classifying and collecting the metal microspheres by classifying with a sieving net having a lower limit sieve diameter after classifying by providing plate materials at intervals substantially equal to the upper limit. Method.