JPH0792074A - Method and device for measuring grain size of powder - Google Patents
Method and device for measuring grain size of powderInfo
- Publication number
- JPH0792074A JPH0792074A JP5259378A JP25937893A JPH0792074A JP H0792074 A JPH0792074 A JP H0792074A JP 5259378 A JP5259378 A JP 5259378A JP 25937893 A JP25937893 A JP 25937893A JP H0792074 A JPH0792074 A JP H0792074A
- Authority
- JP
- Japan
- Prior art keywords
- powder
- granulated powder
- particle size
- measuring
- granulated
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000000843 powder Substances 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000005259 measurement Methods 0.000 claims abstract description 17
- 230000003287 optical effect Effects 0.000 claims abstract description 8
- 239000000919 ceramic Substances 0.000 claims abstract description 5
- 239000002245 particle Substances 0.000 claims description 30
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- 239000007789 gas Substances 0.000 claims description 6
- 239000011195 cermet Substances 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 238000007664 blowing Methods 0.000 claims description 2
- 238000005507 spraying Methods 0.000 claims description 2
- 238000004663 powder metallurgy Methods 0.000 abstract description 2
- 238000000691 measurement method Methods 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- 239000002994 raw material Substances 0.000 description 3
- 238000007873 sieving Methods 0.000 description 3
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000001694 spray drying Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Analysing Materials By The Use Of Radiation (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、粉末の粒度測定に関
するもので、特に粉末冶金法に用いる超硬合金やサーメ
ット等の造粒粉末の粒度測定に適した測定方法とその装
置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to powder particle size measurement, and more particularly to a measurement method and apparatus suitable for particle size measurement of granulated powder such as cemented carbide and cermet used in powder metallurgy. .
【０００２】[0002]
【従来の技術】粉末粒子の粒度測定方法としては、従来
より種々の原理を利用したものがあるが、特に網目、音
波、或は機械振動等を利用した機械的手法によるふるい
分け法や、可視光、レーザー、エックス線等を利用した
光学的方法による測定法が用いられていた。2. Description of the Related Art Conventionally, various particle size measuring methods have utilized various principles. In particular, a sieving method by a mechanical method using mesh, sound waves, or mechanical vibration, and visible light A measurement method by an optical method using a laser, an X-ray, etc. has been used.
【０００３】光学的測定方法とは、粉末の集合体が測定
部を通過した時、一方から可視光、レーザー光線、エッ
クス線等の光を当て、ある瞬間に反対側で受光し、粉末
のシシルエットを解析して粉末の粒度を検出するもので
ある。この光学的測定方法のうち近年の主流となってい
る湿式法は、溶媒中に粉末を分散させた状態でその粒度
を測定する方法で、機械的手法のふるい分け法等に比べ
て毎ロットの測定量が多くとれ、又、測定できる粒度範
囲も広い。The optical measurement method is that when a powder aggregate passes through a measuring section, it is irradiated with visible light, laser light, X-rays, etc. from one side, and is received at the other side at a certain moment to obtain a powder silhouette. It analyzes and detects the particle size of powder. Among these optical measurement methods, the wet method, which has become the mainstream in recent years, is a method of measuring the particle size of a powder in a solvent in a dispersed state. A large amount can be taken and the measurable particle size range is wide.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、上記し
た従来の粒度測定装置は、何れも硬質の原料粉末を測る
のには適するが、そのまま造粒粉末の粒度測定に応用す
ると種々の問題が生じる。なぜなら、原料粉末を湿式混
合し、噴霧乾燥して造粒された粉末は、原料粉末に比べ
てその表面が柔らかく、且つ壊れたり凝集しやすくなっ
ているからである。However, all of the above-mentioned conventional particle size measuring devices are suitable for measuring hard raw material powders, but when they are directly applied to the particle size measurement of granulated powders, various problems occur. This is because the powder obtained by wet-mixing the raw material powders and spray-drying the powder has a softer surface than the raw material powders and is more likely to be broken or aggregated.
【０００５】そのため、機械的手法のふるい分け法を用
いると、網目通過時や測定時の音波や機械振動等により
造粒粉末が潰れてしまい正確な粒度が測定できない。Therefore, when the mechanical sieving method is used, the granulated powder is crushed due to sound waves or mechanical vibrations when passing through the mesh or at the time of measurement, so that an accurate particle size cannot be measured.
【０００６】又、レーザー光を用いた湿式法を用いて
も、溶媒中で造粒粉末が崩れたり凝集したりして真の粒
度が測定できなくなる。溶媒を用いないで真空吸引によ
り試料を測定部へ運ぶ乾式で行なっても、造粒粉末は分
散が悪く、凝集したままの状態で運ばれるので、正確な
粒度を測定するのは難しかった。Even if a wet method using a laser beam is used, the granulated powder collapses or agglomerates in the solvent, making it impossible to measure the true particle size. Even if the sample is dried by vacuum suction without using a solvent, the granulated powder is poorly dispersed and is transported in an agglomerated state. Therefore, it is difficult to accurately measure the particle size.
【０００７】[0007]
【課題を解決するための手段】本発明者らは、硬質合金
の造粒粉末の粒度測定における上記問題点を解決し、造
粒粉末をいかに効率よく且つ正確に測定できるかを検討
した結果、この発明に至ったものである。Means for Solving the Problems The present inventors have solved the above problems in particle size measurement of granulated powder of hard alloys, and as a result of studying how efficiently and accurately the granulated powder can be measured, This invention was reached.
【０００８】この発明は、レーザー又はエックス線等の
光学的方法により超硬合金、サーメット又はセラミック
からなる造粒粉末の粒度を測定する方法において、造粒
粉末に振動を加えながら乾式で測定部に供給し、測定の
直前に空気、窒素等のガスを吹きつけて粉末を分散する
方法を採用したものである。The present invention is a method for measuring the particle size of a granulated powder made of cemented carbide, cermet or ceramics by an optical method such as laser or X-ray, which is supplied to the measuring section in a dry manner while vibrating the granulated powder. Then, a method of spraying a gas such as air or nitrogen to disperse the powder immediately before the measurement is adopted.
【０００９】[0009]
【作用】まず、粒度測定にはその測定効率や正確さから
レーザー又はエックス線等の光学的手法を用いる。又、
溶媒中に試料を分散させる湿式法だと表面が柔らかい造
粒粉末が変質してしまうので、乾式状態にて造粒粉末を
落下させ、その途中で測定を行なうようにする。First, an optical method such as laser or X-ray is used for the particle size measurement because of its measuring efficiency and accuracy. or,
If the wet method of dispersing the sample in the solvent changes the quality of the granulated powder having a soft surface, the granulated powder is dropped in a dry state and the measurement is performed in the middle.
【００１０】造粒粉末は複数が弱く凝集して２〜５ｍｍ
程度の塊となっており、この塊のままで測定部に運ばれ
ると正確な粒度が検出できないので、測定のための落下
前に造粒粉末に振動を加えて凝集をほぐして分散させる
が、この振動はモーター等の駆動により供給される通常
の機械的振動でよい。A plurality of granulated powders are weakly agglomerated and are 2 to 5 mm.
It is a lump of degree, and if it is carried to the measurement part as it is, the accurate particle size cannot be detected, so before applying the drop for measurement, vibration is applied to the granulated powder to loosen and disperse the agglomerates, This vibration may be ordinary mechanical vibration supplied by driving a motor or the like.
【００１１】更に、落下して測定直前の造粒粉末に、空
気や窒素等のガスを吹きつける。ガスの吹きつけによる
分散を行なえば、表面が柔らかい造粒粉末を痛めずに個
々の粒子に分散させることができ、正確な粒度測定を行
なうことができる。Further, a gas such as air or nitrogen is blown onto the granulated powder immediately after dropping and immediately before measurement. When the dispersion is performed by blowing a gas, the granulated powder having a soft surface can be dispersed into individual particles without damaging, and accurate particle size measurement can be performed.
【００１２】[0012]
【実施例】以下、この発明の実施例を添付図面を参照し
て説明する。Embodiments of the present invention will be described below with reference to the accompanying drawings.
【００１３】ＷＣ−５％Ｃｏに配合して湿式混合後、ス
プレードライヤーにより乾燥、造粒した超硬合金の造粒
粉末を、本発明の方法を用いて粒度を測定した。The granulated powder of cemented carbide was blended with WC-5% Co, wet-mixed, dried with a spray dryer and granulated, and the particle size was measured by the method of the present invention.
【００１４】まず、ガイド１に被測定物である造粒粉末
を供給する。ガイド１全体には振動が加えられており、
ガイド１内の造粒粉末は斜め下方向に滑り落ちるように
送られ、測定物供給口２の真上で落下する。又、この時
に加えられる振動により造粒粉末の複数個が凝集した塊
がほぐされる。First, a granulated powder, which is an object to be measured, is supplied to the guide 1. Vibration is applied to the entire guide 1,
The granulated powder in the guide 1 is fed so as to slide down diagonally and drops right above the measured substance supply port 2. Further, the vibrations applied at this time loosen the lumps of the plurality of granulated powders.
【００１５】落下する造粒粉末３は、ガス噴射装置４に
て空気５が吹きつけられ、更に複数粒子の凝集が個々の
粒子にほぐされた状態で落下し、測定部６において、造
粒粉末３にレーザー発光装置７にてレーザー光が当てら
れ、受光部８にて造粒粉末３の回析像が検出され、解析
後粒度が測定される。The falling granulated powder 3 is blown with air 5 by a gas injection device 4 and further drops in a state in which agglomeration of a plurality of particles is disentangled into individual particles. Laser light is applied to the laser beam 3 by the laser emitting device 7, the diffraction image of the granulated powder 3 is detected by the light receiving unit 8, and the particle size after analysis is measured.
【００１６】尚、本発明の実施例の他、比較例として従
来のレーザー乾式真空吸引法、レーザー湿式法、及
びふるい分け法、による測定も行ない、それらの測定
粒度とばらつき（Ｒ：最大値と最小値の差）の結果を表
１に示す。In addition to the examples of the present invention, the conventional laser dry vacuum suction method, laser wet method, and sieving method were also measured as comparative examples, and the measurement particle size and variation (R: maximum value and minimum value) were measured. The results of (value difference) are shown in Table 1.
【００１７】[0017]
【表１】 [Table 1]
【００１８】[0018]
【発明の効果】以上説明したように、本発明によれば、
造粒粉末の粒度分布を効率よく正確に測定できるので、
この粒度測定を活用して粒度を調整した造粒粉末を用い
れば、プレス体の寸法精度が向上したり、サーメットの
プレス体のキレツ不良が減少する等の効果がある。As described above, according to the present invention,
Since the particle size distribution of the granulated powder can be measured efficiently and accurately,
The use of the granulated powder whose particle size is adjusted by utilizing this particle size measurement has the effects of improving the dimensional accuracy of the pressed body and reducing defects in the cermet pressed body.
【図１】本発明による粉末の粒度測定装置を示す概略図
である。FIG. 1 is a schematic view showing a powder particle size measuring apparatus according to the present invention.
１ ガイド ３ 造粒粉末 ５ 空気 ６ 測定部 ７ レーザー発光装置 1 Guide 3 Granulated powder 5 Air 6 Measuring part 7 Laser emission device
───────────────────────────────────────────────────── フロントページの続き (72)発明者 湊 嘉洋 兵庫県伊丹市昆陽北一丁目１番１号 住友 電気工業株式会社伊丹製作所内 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Yoshihiro Minato 1-1-1 Kunyokita, Itami City, Hyogo Prefecture Sumitomo Electric Industries, Ltd. Itami Works
Claims (2)
により超硬合金、サーメット又はセラミックからなる造
粒粉末の粒度を測定する方法において、造粒粉末に振動
を加えながら乾式で測定部に供給し、測定の直前に空気
又は窒素等のガスを吹きつけて粉末を分散することを特
徴とする造粒粉末の粒度測定方法。1. A method for measuring the particle size of a granulated powder made of cemented carbide, cermet or ceramics by an optical method such as laser or X-ray, which is supplied to a measuring section in a dry manner while vibrating the granulated powder, A particle size measuring method for a granulated powder, which comprises spraying a gas such as air or nitrogen immediately before measurement to disperse the powder.
により超硬合金、サーメット又はセラミックからなる造
粒粉末の粒度を測定する装置において、試料粉末に振動
を加えながら乾式で測定部に供給する装置と、測定の直
前に空気又は窒素等のガスを吹きつけて粉末を分散する
装置からなることを特徴とする造粒粉末の粒度測定装
置。2. An apparatus for measuring the particle size of a granulated powder made of cemented carbide, cermet or ceramics by an optical method such as laser or X-ray, and an apparatus for supplying the powder to the measuring section in a dry manner while vibrating the sample powder. A particle size measuring device for granulated powder, which comprises a device for dispersing a powder by blowing a gas such as air or nitrogen immediately before measurement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25937893A JP3260217B2 (en) | 1993-09-22 | 1993-09-22 | Method and apparatus for measuring powder particle size |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25937893A JP3260217B2 (en) | 1993-09-22 | 1993-09-22 | Method and apparatus for measuring powder particle size |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0792074A true JPH0792074A (en) | 1995-04-07 |
| JP3260217B2 JP3260217B2 (en) | 2002-02-25 |
Family
ID=17333302
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25937893A Expired - Fee Related JP3260217B2 (en) | 1993-09-22 | 1993-09-22 | Method and apparatus for measuring powder particle size |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3260217B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011145162A (en) * | 2010-01-14 | 2011-07-28 | Japan Atomic Energy Agency | X-ray detection method of fine particles in fluid |
| CN113702253A (en) * | 2021-07-08 | 2021-11-26 | 中国科学院金属研究所 | Method for detecting particle size of ultrafine powder for selective laser melting forming |
-
1993
- 1993-09-22 JP JP25937893A patent/JP3260217B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011145162A (en) * | 2010-01-14 | 2011-07-28 | Japan Atomic Energy Agency | X-ray detection method of fine particles in fluid |
| CN113702253A (en) * | 2021-07-08 | 2021-11-26 | 中国科学院金属研究所 | Method for detecting particle size of ultrafine powder for selective laser melting forming |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3260217B2 (en) | 2002-02-25 |
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