JPH06229984A - Inspection method of powder compression molded product - Google Patents
Inspection method of powder compression molded productInfo
- Publication number
- JPH06229984A JPH06229984A JP1394493A JP1394493A JPH06229984A JP H06229984 A JPH06229984 A JP H06229984A JP 1394493 A JP1394493 A JP 1394493A JP 1394493 A JP1394493 A JP 1394493A JP H06229984 A JPH06229984 A JP H06229984A
- Authority
- JP
- Japan
- Prior art keywords
- molded product
- density
- surface layer
- electromagnetic induction
- layer part
- 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.)
- Pending
Links
Landscapes
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
- Powder Metallurgy (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、金属粉とバインダから
なる複合軟磁性体材料を圧縮成形して作製した粉末圧縮
成形体を、電磁誘導試験を用いて、その成形体表層部密
度を測定し、成形体の良否判定をする粉末圧縮成形体の
検査方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention measures the density of the surface layer of a powder compact formed by compression molding a composite soft magnetic material consisting of metal powder and a binder, using an electromagnetic induction test. However, the present invention relates to a method for inspecting a powder compression-molded product for determining the quality of the molded product.
【０００２】[0002]
【従来の技術】従来、複合軟磁性体材料を圧縮成形して
作製した圧縮成形体の良否判定を行うための密度測定方
法は、次に述べるような方法で行っていた。2. Description of the Related Art Conventionally, the density measuring method for judging the quality of a compression molded body produced by compression molding a composite soft magnetic material has been carried out by the following method.
【０００３】第１の方法として、まず粉末圧縮成形体の
外形寸法をマイクロメータなどを用いて寸法測定をし、
その測定結果から粉末圧縮成形体の体積を算出する。次
に粉末圧縮成形体の質量を電子天秤などを用いて測定す
る。このようにして求められたそれぞれの結果から、質
量を体積で割ることによって粉末圧縮成形体の密度を求
めていた。As a first method, first, the external dimensions of the powder compression molded product are measured using a micrometer or the like,
The volume of the powder compression molded product is calculated from the measurement result. Next, the mass of the powder compression molded product is measured using an electronic balance or the like. From each of the results thus obtained, the density of the powder compression molded body was obtained by dividing the mass by the volume.
【０００４】第２の方法として、粉末圧縮成形体を水に
つけた状態での重量測定と水中外での質量測定により、
成形体の密度を求めるアルキメデス法を利用した密度測
定機を用いて密度の評価を行っていた。As a second method, the powder compression molding is weighed in water and the mass is measured in and out of water.
The density was evaluated using a density measuring machine using the Archimedes method for determining the density of a molded body.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら従来のい
ずれの方法でも、粉末圧縮成形体の密度の高い表層部分
と、密度の低い中心部分との平均密度を測定しているこ
とになり、表層部分のみの密度の測定をすることはでき
なかった。このようにして密度測定の精度が低いために
良否判定を行うには、測定後さらに顕微鏡による表層部
の粉末充填状態を確認することが必要であるという問題
点を有していた。However, in any of the conventional methods, the average density of the surface layer portion having a high density and the center portion having a low density of the powder compression molded product is measured, and only the surface layer portion is measured. It was not possible to measure the density of. As described above, since the accuracy of the density measurement is low, it is necessary to further confirm the powder filling state of the surface layer portion by the microscope after the measurement in order to perform the quality determination.
【０００６】本発明は上記問題点を解決するものであ
り、圧縮成形体の表層部密度を簡単な方法によって迅速
に良否判定を行うことを目的とする。The present invention solves the above problems, and an object of the present invention is to quickly determine the quality of the surface layer portion density of a compression molded product by a simple method.
【０００７】[0007]
【課題を解決するための手段】この目的を達成するため
に本発明は、金属粉とバインダからなる複合軟磁性体材
料を圧縮成形によって作製した粉末圧縮成形体を、電磁
誘導試験を用いて成形体表層部密度を測定することを特
徴とするものである。In order to achieve this object, the present invention is to form a powder compression-molded article produced by compression-molding a composite soft magnetic material material consisting of metal powder and a binder by using an electromagnetic induction test. It is characterized in that the body surface layer density is measured.
【０００８】[0008]
【作用】本発明は電磁誘導試験の特徴である試験コイル
に近い試験体表層部分に誘導電流が集中し、試験体内部
に行くほど減少するという表皮効果を利用することによ
って、粉末圧縮成形体の表層部密度を測定することが可
能となり、その測定結果から成形時の加圧が不完全な両
押し状態で成形されている試料や、加圧圧力の不足して
いる試料などを不良品として迅速に判定する。The present invention utilizes the skin effect, which is a feature of the electromagnetic induction test, in which the induced current is concentrated on the surface layer portion of the test body close to the test coil and decreases toward the inside of the test body. It is possible to measure the surface layer density, and from the measurement results, it is possible to quickly determine defective products such as samples that are molded in a double-pressed state where the pressure during molding is incomplete or samples with insufficient pressure. To judge.
【０００９】以上のように金属粉とバインダからなる粉
末圧縮成形体を電磁誘導試験にて、成形体表層部密度を
測定することによって、成形体表層部分の粉末の充填状
態を容易かつ定量的に評価でき、成形体の良否判定を行
える。As described above, the powder compression molding formed of the metal powder and the binder is subjected to the electromagnetic induction test to measure the density of the surface layer of the molded body to easily and quantitatively determine the filling state of the powder in the surface layer of the molded body. It can be evaluated and the quality of the molded product can be judged.
【００１０】[0010]
【実施例】以下、本発明の一実施例について説明する。
平均粒径100μmの純鉄粉にエポキシ樹脂と硬化剤を混練
して、成形用コンパウンドを得る。得られた成形用コン
パウンドを金型にて圧縮成形する。成形後、120℃で１
時間硬化させて粉末圧縮成形体試料を得る。このように
して作製した粉末圧縮成形体を電磁誘導試験機で測定し
て、成形体表層部密度の測定を行う。EXAMPLES An example of the present invention will be described below.
An epoxy resin and a curing agent are kneaded with pure iron powder having an average particle size of 100 μm to obtain a molding compound. The obtained molding compound is compression-molded with a mold. After molding, 1 at 120 ℃
It is cured for a time to obtain a powder compression molded sample. The powder compression molded product thus produced is measured with an electromagnetic induction tester to measure the surface layer density of the molded product.
【００１１】図１は本発明の一実施例における成形体密
度による電磁誘導試験機の出力電圧の変化を示したもの
である。FIG. 1 shows changes in the output voltage of the electromagnetic induction tester according to the density of the molded body in one embodiment of the present invention.
【００１２】図１より粉末圧縮成形体の密度(横軸)が上
昇するにしたがって、電磁誘導試験機の出力電圧(縦軸)
も上昇していることがわかる。これは、成形体の測定面
の状態が低密度の試料については、表層部分に空孔が多
いため電磁誘導によって生じる誘導電流の流れが阻害さ
れ、出力電圧が低くなった。また、高密度の試料につい
ては、空孔が少なく誘導電流を妨げる因子が少ないた
め、出力電圧が高くなったものと考えられる。From FIG. 1, the output voltage of the electromagnetic induction tester (vertical axis) increases as the density (horizontal axis) of the powder compression molding increases.
It can be seen that is also rising. This is because the sample having a low density measurement surface of the molded body had many pores in the surface layer, which hindered the flow of the induced current generated by electromagnetic induction, resulting in a low output voltage. Further, it is considered that the high-density sample has a high output voltage because it has few vacancies and few factors hindering the induced current.
【００１３】このことを利用すれば、成形体表層部分に
流れる誘導電流の変化によって、粉末圧縮成形体の表層
部分の密度を測定することができるため、成形体の特性
に必要な密度の範囲の設定を行えば、設定範囲から外れ
る成形体については不良品として取り除くことができる
と同時に、粉末の表層部における充填状態についても定
量的に評価することができる。By utilizing this, the density of the surface layer portion of the powder compression molding can be measured by the change of the induced current flowing in the surface layer portion of the molding, so that the density range required for the characteristics of the molding can be obtained. If the setting is made, a molded product out of the set range can be removed as a defective product, and at the same time, the filling state of the powder in the surface layer portion can be quantitatively evaluated.
【００１４】[0014]
【発明の効果】以上説明したように、本発明の粉末圧縮
成形体の検査方法は、電磁誘導試験を用いて金属粉末を
含有する圧縮成形体の表層部密度の測定をすることによ
って、成形体表層部分の粉末の充填状態を定量的に評価
することができ、商品製造時における成形体の良否判定
を容易、かつ迅速にすることができるという利点を有し
ている。As described above, the method for inspecting a powder compression-molded article of the present invention comprises measuring the surface layer density of the compression-molded article containing the metal powder by using an electromagnetic induction test. The powder filling state of the surface layer portion can be quantitatively evaluated, and there is an advantage that the quality of the molded product at the time of product manufacture can be determined easily and quickly.
【図１】本発明の一実施例における成形体密度による電
磁誘導試験機の出力電圧の変化を示したものである。FIG. 1 is a graph showing a change in output voltage of an electromagnetic induction tester according to a density of a molded body according to an embodiment of the present invention.
Claims (1)
材料の得られた成形用コンパウンドを圧縮成形によって
作製した粉末圧縮成形体を、電磁誘導試験を用いて成形
体表層部密度を測定することを特徴とする粉末圧縮成形
体の検査方法。1. A powder compression molded article produced by compression molding of a molding compound obtained from a composite soft magnetic material comprising metal powder and a binder, and the density of the surface layer of the molded article is measured by an electromagnetic induction test. A method for inspecting a powder compression-molded article, comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1394493A JPH06229984A (en) | 1993-01-29 | 1993-01-29 | Inspection method of powder compression molded product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1394493A JPH06229984A (en) | 1993-01-29 | 1993-01-29 | Inspection method of powder compression molded product |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06229984A true JPH06229984A (en) | 1994-08-19 |
Family
ID=11847324
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1394493A Pending JPH06229984A (en) | 1993-01-29 | 1993-01-29 | Inspection method of powder compression molded product |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06229984A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1795889A1 (en) * | 2005-12-07 | 2007-06-13 | EATON Corporation | Method and apparatus for determining density of metal-inclusive components by inductance technics |
| EP2772754A1 (en) * | 2011-10-24 | 2014-09-03 | JFE Steel Corporation | Measuring method and measuring device for apparent density of metallic powder, production method and production device for mixed powder, and production method and production device for powder compact |
-
1993
- 1993-01-29 JP JP1394493A patent/JPH06229984A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1795889A1 (en) * | 2005-12-07 | 2007-06-13 | EATON Corporation | Method and apparatus for determining density of metal-inclusive components by inductance technics |
| EP2772754A1 (en) * | 2011-10-24 | 2014-09-03 | JFE Steel Corporation | Measuring method and measuring device for apparent density of metallic powder, production method and production device for mixed powder, and production method and production device for powder compact |
| EP2772754A4 (en) * | 2011-10-24 | 2015-01-07 | Jfe Steel Corp | Measuring method and measuring device for apparent density of metallic powder, production method and production device for mixed powder, and production method and production device for powder compact |
| US10092952B2 (en) | 2011-10-24 | 2018-10-09 | Jfe Steel Corporation | Method and apparatus for measuring apparent density of metal powder, method and apparatus for producing mixed powder, and method and apparatus for producing powder compact |
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