JP2016069708A - Iron powder for surface finishing and method for producing the same - Google Patents
Iron powder for surface finishing and method for producing the same Download PDFInfo
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Abstract
Description
本発明は、ブラスト処理による表面仕上げ用の還元鉄粉に関する。 The present invention relates to reduced iron powder for surface finishing by blasting.
従来より、金属製品の表面仕上げのために還元鉄粉を使用したブラスト処理方法が知られている。鉄粉は、ガラスビーズやセラミックビーズに比べて高靭性であり破壊されにくい特徴を持っている。 Conventionally, a blasting method using reduced iron powder is known for surface finishing of metal products. Iron powder is tougher and harder to break than glass beads and ceramic beads.
例えば、特許文献１では、ショット材として高炭素鋼の球状鉄粉を使用することで、表面仕上げをした金属の表面粗さを低減させた、金属製品の表面仕上げ方法が提案されている。 For example, Patent Document 1 proposes a surface finishing method for a metal product in which the surface roughness of a surface-finished metal is reduced by using spherical iron powder of high carbon steel as a shot material.
従来の表面仕上げ用の鉄粉としては、特許文献１のような硬度の高い高炭素鋼の鉄粉や、硬度の低い還元鉄粉が知られていた。しかし、硬度の高い高炭素鋼の鉄粉は、研磨力が強すぎるため製品の損耗が激しいという問題点があった。また、硬度の低い還元鉄粉を用いると、適度な研磨力は得られるが、表面仕上げの処理むらが生じてしまうという問題点があった。 As conventional iron powder for surface finishing, high-carbon steel iron powder having a high hardness as in Patent Document 1 and reduced iron powder having a low hardness have been known. However, high-carbon steel iron powder with high hardness has a problem in that product wear is severe because the polishing power is too strong. Further, when reduced iron powder with low hardness is used, an appropriate polishing force can be obtained, but there is a problem that unevenness of the surface finish occurs.
表面仕上げの処理むらが生じる原因について、本発明者は表面仕上げ用に使用されていた還元鉄粉の見掛密度に注目した。すなわち、鉄粉の見掛密度が低いと、粒子内の空隙の割合が大きくなり、ブラスト処理時に製品表面での衝突応力の大きさにばらつきが生じ、処理むらが生じてしまうことに想到した。 Regarding the cause of unevenness in the surface finishing, the present inventor paid attention to the apparent density of the reduced iron powder used for the surface finishing. That is, when the apparent density of the iron powder is low, the ratio of voids in the particles increases, and the impact stress on the product surface varies during blasting, resulting in uneven processing.
本発明は、このような状況の下でなされたものであり、その解決しようとする課題は、表面仕上げ用鉄粉として適度な研磨力を持ちつつ、表面仕上げの処理むらを無くすために、見掛密度の高い還元鉄粉と、その製造方法を提供しようというものである。
The present invention has been made under such circumstances, and the problem to be solved is to eliminate surface unevenness of processing while having an appropriate polishing force as surface finishing iron powder. It is intended to provide reduced iron powder with a high density and a method for producing the same.
上述の課題を達成するため、本発明者らが鋭意研究を行った結果、還元鉄粉に対してハンマーミルでの粉砕処理を繰り返し行い、その後に分級処理を行う事で、鉄粉の見掛密度を高めることが出来るという知見を得た。本発明はこのような知見に基づいて完成したものである。 In order to achieve the above-mentioned problems, the present inventors have conducted intensive research. The knowledge that the density can be increased was obtained. The present invention has been completed based on such findings.
すなわち、上述の課題を達成するための第１の発明は、
見掛密度が３０００ｋｇ／ｍ３以上４０００ｋｇ／ｍ３以下である、金属製品の表面仕上げ用の還元鉄粉である。
第２の発明は、
酸化鉄粉末を還元処理することで海綿鉄ケーキを得る工程と、
上記海綿鉄ケーキを破砕処理後に粉砕処理することで海綿状鉄粉の粉砕品を得る工程と、
上記海綿状鉄粉の粉砕品を、見掛密度を３０００ｋｇ／ｍ３以上４０００ｋｇ／ｍ３となるまで繰り返し粉砕する事で、海綿状鉄粉の見掛密度調整品を得る工程と、
上記海綿状鉄粉の見掛密度調整品を分級処理する工程、
とを有する、金属製品の表面仕上げ用の還元鉄粉の製造方法である。
That is, the first invention for achieving the above-described problem is:
It is a reduced iron powder for surface finishing of metal products having an apparent density of 3000 kg / m 3 or more and 4000 kg / m 3 or less.
The second invention is
A process of obtaining sponge iron cake by reducing iron oxide powder;
A step of obtaining a pulverized product of sponge-like iron powder by pulverizing the sponge iron cake after the crushing treatment;
A step of obtaining an apparent density adjusted product of sponge-like iron powder by repeatedly crushing the pulverized product of sponge-like iron powder until the apparent density is 3000 kg / m 3 or more and 4000 kg / m 3 ;
A step of classifying the apparent density adjusted product of the sponge iron powder,
A method for producing reduced iron powder for surface finishing of metal products.
本発明に係る表面仕上げ用の鉄粉を表面処理に用いる事で、製品の過度な損耗がなく、かつ表面仕上げの処理むら無く、表面仕上げをすることが可能となる。
By using the iron powder for surface finishing according to the present invention for the surface treatment, it becomes possible to finish the surface without excessive wear of the product and without unevenness of the surface finishing.
《表面仕上げ用鉄粉》
以下、本発明について詳細に説明する。
本発明に係る表面仕上げ用の鉄粉は、要求される研磨力とするために、還元鉄粉すなわち海綿状鉄粉であることが望ましい。高炭素鋼などと比較して硬度が低い還元鉄粉とする事で、研磨力も低く抑えることが出来、製品を必要以上に損耗することを防止できる。
《Surface finish iron powder》
Hereinafter, the present invention will be described in detail.
The iron powder for surface finishing according to the present invention is desirably reduced iron powder, that is, spongy iron powder, in order to obtain the required polishing power. By using reduced iron powder having a lower hardness than that of high carbon steel or the like, it is possible to keep the polishing power low and prevent the product from being worn more than necessary.
また、本発明に係る表面仕上げ用鉄粉は、見掛密度が３０００ｋｇ／ｍ３以上４０００ｋｇ／ｍ３以下である事が望ましい。
見掛密度が３０００ｋｇ／ｍ３未満であると、ブラスト処理時に製品表面での衝突応力の大きさにばらつきが生じ、処理むらが生じる原因となる。
逆に見掛密度が４０００ｋｇ／ｍ３超であると、見掛密度を高めるために著しく表面仕上げ用鉄粉の生産性や歩留まりが悪化するため大量生産には適さない。
The iron powder for surface finishing according to the present invention, it is desirable apparent density of 3000 kg / m 3 or more 4000 kg / m 3 or less.
When the apparent density is less than 3000 kg / m 3 , the magnitude of the collision stress on the product surface varies during the blasting process, which causes uneven processing.
On the other hand, if the apparent density exceeds 4000 kg / m 3 , the productivity and yield of the surface finishing iron powder are remarkably deteriorated in order to increase the apparent density, which is not suitable for mass production.
また、本発明に係る表面仕上げ用鉄粉は、仕上げにねらい表面粗さに応じて、鉄粉の粒度をふるいで調整することが出来る。
粒度の調整としては、たとえば１８０μm以上４２５μm以下、１５０μm以上３００μm以下、１２５μm以上２５０μm以下、１０６μm以上１８０μm以下、７５μm以上１５０μm以下などとすると良い。
Moreover, the iron powder for surface finishing which concerns on this invention can be adjusted by sieving the particle size of iron powder according to the surface roughness aiming at finishing.
For example, the particle size may be adjusted to 180 μm or more and 425 μm or less, 150 μm or more and 300 μm or less, 125 μm or more and 250 μm or less, 106 μm or more and 180 μm or less, or 75 μm or more and 150 μm or less.
《表面仕上げ用鉄粉の製造方法》
表面仕上げ用鉄粉の原料としては、不純物の少ない酸化鉄を使用することが望ましい。原料としては、製鉄所の熱間圧延工程で生じるミルスケールが好例である。
<Production method of iron powder for surface finishing>
As a raw material for the iron powder for surface finishing, it is desirable to use iron oxide with few impurities. A good example of the raw material is a mill scale generated in a hot rolling process at a steel mill.
上記原料を、還元剤とともにトンネル炉などの焼成炉に導入し、還元処理する事で、海綿鉄ケーキを得る。還元処理の方法としては、特開昭６１−１８３４０２、特開２００５−２６４３０２、特開２００４−６００００など、公知の方法で実施すればよい。還元剤としては、コークス粉、石炭などの炭素材を利用可能である。 Sponge iron cake is obtained by introducing the raw material together with a reducing agent into a firing furnace such as a tunnel furnace and performing a reduction treatment. The reduction treatment may be performed by a known method such as JP-A-61-183402, JP-A-2005-264302, and JP-A-2004-60000. Carbon materials such as coke powder and coal can be used as the reducing agent.
上記海綿鉄ケーキを破砕し、その後に粉砕する事で、粒度５００μm以下である海綿状鉄粉の微粉砕品を得る。破砕処理ならびに粉砕処理は、公知の装置ならびに方法にて実施すればよい。 The sponge iron cake is crushed and then pulverized to obtain a finely pulverized product of sponge iron powder having a particle size of 500 μm or less. What is necessary is just to implement a crushing process and a crushing process with a well-known apparatus and method.
上記海綿状鉄粉の微粉砕品を篩い分けし、１８０μm以下の粒度の鉄粉を除去することで、海綿状鉄粉の粒度調整品を得る。 The finely pulverized product of the sponge iron powder is sieved, and the iron powder having a particle size of 180 μm or less is removed to obtain a particle size adjusted product of the sponge iron powder.
上記海綿状鉄粉の粒度調整品に対して、ハンマーミルにて微粉砕処理を実施し、海綿状鉄粉の見掛密度調整品を得る。この微粉砕処理は、処理後にサンプリングした鉄粉の見掛密度が３０００ｋｇ／ｍ３以上４０００ｋｇ／ｍ３となるまで、繰り返し実施する。 The sponge iron powder particle size adjusted product is finely pulverized with a hammer mill to obtain a sponge iron powder apparent density adjusted product. This fine pulverization process is repeatedly performed until the apparent density of the iron powder sampled after the process reaches 3000 kg / m 3 or more and 4000 kg / m 3 .
上記海綿状鉄粉の見掛密度調整品に対して、篩い分け処理を実施し、たとえば１８０μm以上４２５μm以下、１５０μm以上３００μm以下、１２５μm以上２５０μm以下、１０６μm以上１８０μm以下、７５μm以上１５０μm以下などに粒度調整することで、見掛密度が３０００ｋｇ／ｍ３以上４０００ｋｇ／ｍ３である本発明に係る表面仕上げ用の還元鉄粉が得られる。
For the apparent density adjusted product of the spongy iron powder, a sieving process is performed, for example, a particle size of 180 μm to 425 μm, 150 μm to 300 μm, 125 μm to 250 μm, 106 μm to 180 μm, 75 μm to 150 μm, etc. By adjusting, the reduced iron powder for surface finishing according to the present invention having an apparent density of 3000 kg / m 3 or more and 4000 kg / m 3 is obtained.
（実施例１）
原料として、製鉄所の熱間圧延工程で生じる酸化鉄である、ミルスケールを使用した。
Example 1
As a raw material, a mill scale, which is iron oxide generated in a hot rolling process at a steel mill, was used.
上記のミルスケールを、ロータリードライヤーで120℃にて乾燥させた後に、還元剤として無煙炭を添加混合した。この無煙炭は、固定炭素 80〜90％、サイズ 4ｍｍ以下のものを用いた。このミルスケール・無煙炭混合物とは別に、固定炭素 50〜90％のコークス粉を準備した。 The mill scale was dried at 120 ° C. with a rotary dryer, and then anthracite was added and mixed as a reducing agent. The anthracite used was 80 to 90% fixed carbon and had a size of 4 mm or less. Apart from this mill scale and anthracite mixture, coke powder with fixed carbon 50-90% was prepared.
炭化ケイ素製の耐熱容器に、ミルスケール・無煙炭混合物を円筒状に、その中心と外側にコークス粉とを充填した。充填した耐熱容器をトンネルキルン炉にて１０５０〜１２５０℃の温度範囲で大気雰囲気中で熱処理し、海綿鉄ケーキを得た。 A silicon carbide heat-resistant container was filled with a mill scale and anthracite mixture in a cylindrical shape and filled with coke powder at the center and outside. The filled heat-resistant container was heat-treated in a tunnel kiln furnace at a temperature range of 1050 to 1250 ° C. in an air atmosphere to obtain a sponge iron cake.
上記熱処理により得られた海綿鉄ケーキに対し、（１）ロールクラッシャーよる粒度約３０ｃｍ以下の粗破砕、（２）ハンマークラッシャーによる粒度約４ｃｍ以下までの微破砕、（３）ハンマーミルで粒度約４ｍｍ以下までの粗粉砕、（４）ハンマーミルの1種であるノボローターミルでの粒度５００μm以下までの微粉砕を、この順に実施し、海綿状鉄粉の微粉砕品を得た。 For the sponge iron cake obtained by the heat treatment, (1) coarse crushing with a roll crusher with a particle size of about 30 cm or less, (2) fine crushing with a hammer crusher to a particle size of about 4 cm or less, (3) a particle size of about 4 mm with a hammer mill The coarse pulverization up to the following and (4) fine pulverization to a particle size of 500 μm or less with a Novorotor mill which is one kind of hammer mill were carried out in this order to obtain a finely pulverized product of spongy iron powder.
上記海綿状鉄粉の微粉砕品に対し、分級点１０μmのサイクロンにて分級処理を実施した後に、振動ふるいにかけ、１８０μm以上の粒度に調整した海綿状鉄粉の粒度調整品を得た。 The finely pulverized sponge iron powder was subjected to a classification treatment with a cyclone having a classification point of 10 μm, and then subjected to a vibration sieve to obtain a particle size adjusted product of sponge iron powder adjusted to a particle size of 180 μm or more.
上記、海綿状鉄粉の粒度調整品を、再度ノボローターミルで微粉砕処理した。処理は、見掛密度が３３００〜３５００ｋｇ/ｍ３の範囲になるまで繰り返し実施し、海綿状鉄粉の見掛密度調整品を得た。 The particle size adjusted product of the spongy iron powder was finely pulverized again with a Novo rotor mill. The treatment was repeated until the apparent density was in the range of 3300 to 3500 kg / m 3 to obtain an apparent density adjusted product of spongy iron powder.
上記海綿状鉄粉の見掛密度調整品に対し、分級点１０μmのサイクロンにて分級処理を実施した後に、振動ふるいにかけ、４２５μm以上ならびに１８０μm以下の粒度成分を除去することで、本発明の実施例１に係る表面仕上げ用鉄粉を得た。その結果を表１に示す。得られた鉄粉で、金属製品の表面仕上げ処理を１ｍ３にわたり実施した後に、処理後の表面を目視観察したところ、処理むらは観察されなかった。
The above-mentioned sponge iron powder apparent density adjusted product is subjected to a classification treatment with a cyclone having a classification point of 10 μm, and then subjected to a vibration sieve to remove particle size components of 425 μm or more and 180 μm or less. The iron powder for surface finishing according to Example 1 was obtained. The results are shown in Table 1. After the surface finish treatment of the metal product was carried out for 1 m 3 with the obtained iron powder, the treated surface was visually observed, and no treatment unevenness was observed.
（粒度分布）
本発明に係る鉄粉の粒度分布は、ＪＩＳＺ２５１０−２００４に定められた方法を用いてふるい分けすることによって評価した。なお、本明細書中の粒度は、ふるい目開きにより定める。
(Particle size distribution)
The particle size distribution of the iron powder according to the present invention was evaluated by sieving using the method defined in JISZ2510-2004. In addition, the particle size in this specification is defined by the sieve opening.
（組成分析）
（金属鉄の分析）
本発明に係る鉄粉中の鉄濃度については、JIS M 8212:2005 鉄鉱石―全鉄定量方法の手順により分析を行った。
(Composition analysis)
(Analysis of metallic iron)
The iron concentration in the iron powder according to the present invention was analyzed by the procedure of JIS M 8212: 2005 Iron Ore-Total Iron Quantitative Method.
（Ｃの分析）
本発明に係る鉄粉中のＣ濃度については、JIS G 1211-3:2011 鉄及び鋼−炭素定量方法−第3部：燃焼−赤外線吸収法の手順により分析を行った。
(Analysis of C)
About the C density | concentration in the iron powder which concerns on this invention, it analyzed by the procedure of JIS G 1211-3: 2011 Iron and steel-carbon determination method-Part 3: Combustion-infrared absorption method.
（見掛密度の測定）
本発明に係る鉄粉の見掛密度については、JIS Z 2504 金属粉の見掛密度試験方法の手順により分析を行った。
(Measurement of apparent density)
The apparent density of the iron powder according to the present invention was analyzed by the procedure of the apparent density test method of JIS Z 2504 metal powder.
（実施例２）
実施例１において、海綿状鉄粉の見掛密度調整品に対して、分級点１０μmのサイクロンにて分級処理を実施した後に、振動ふるいにかけ、３００μm以上ならびに１５０μm以下の粒度成分を除去した以外は、実施例１と同様とすることで、本発明の実施例２に係る表面仕上げ用鉄粉を得た。得られた鉄粉で、金属製品の表面仕上げ処理を１ｍ３にわたり実施した後に、処理後の表面を目視観察したところ、処理むらは観察されなかった。
(Example 2)
In Example 1, the apparent density adjusted product of spongy iron powder was subjected to classification treatment with a cyclone having a classification point of 10 μm, and then subjected to a vibration sieve to remove particle size components of 300 μm or more and 150 μm or less. In the same manner as in Example 1, iron powder for surface finishing according to Example 2 of the present invention was obtained. After the surface finish treatment of the metal product was carried out for 1 m 3 with the obtained iron powder, the treated surface was visually observed, and no treatment unevenness was observed.
（実施例３）
実施例１において、海綿状鉄粉の見掛密度調整品に対して、分級点１０μmのサイクロンにて分級処理を実施した後に、振動ふるいにかけ、２５０μm以上ならびに１２５μm以下の粒度成分を除去した以外は、実施例１と同様とすることで、本発明の実施例３に係る表面仕上げ用鉄粉を得た。得られた鉄粉で、金属製品の表面仕上げ処理を１ｍ３にわたり実施した後に、処理後の表面を目視観察したところ、処理むらは観察されなかった。
(Example 3)
In Example 1, the apparent density adjusted product of the spongy iron powder was subjected to classification treatment with a cyclone having a classification point of 10 μm, and then subjected to a vibration sieve to remove particle components of 250 μm or more and 125 μm or less. In the same manner as in Example 1, iron powder for surface finishing according to Example 3 of the present invention was obtained. After the surface finish treatment of the metal product was carried out for 1 m 3 with the obtained iron powder, the treated surface was visually observed, and no treatment unevenness was observed.
（実施例４）
実施例１において、海綿状鉄粉の見掛密度調整品に対して、分級点１０μmのサイクロンにて分級処理を実施した後に、振動ふるいにかけ、１８０μm以上ならびに１０６μm以下の粒度成分を除去した以外は、実施例１と同様とすることで、本発明の実施例４に係る表面仕上げ用鉄粉を得た。得られた鉄粉で、金属製品の表面仕上げ処理を１ｍ３にわたり実施した後に、処理後の表面を目視観察したところ、処理むらは観察されなかった。
Example 4
In Example 1, the apparent density adjusted product of spongy iron powder was subjected to a classification treatment with a cyclone having a classification point of 10 μm, and then subjected to a vibration sieve to remove particle size components of 180 μm or more and 106 μm or less. In the same manner as in Example 1, iron powder for surface finishing according to Example 4 of the present invention was obtained. After the surface finish treatment of the metal product was carried out for 1 m 3 with the obtained iron powder, the treated surface was visually observed, and no treatment unevenness was observed.
（実施例５）
実施例１において、海綿状鉄粉の見掛密度調整品に対して、分級点１０μmのサイクロンにて分級処理を実施した後に、振動ふるいにかけ、１５０μm以上ならびに７５μm以下の粒度成分を除去した以外は、実施例１と同様とすることで、本発明の実施例５に係る表面仕上げ用鉄粉を得た。得られた鉄粉で、金属製品の表面仕上げ処理を１ｍ３にわたり実施した後に、処理後の表面を目視観察したところ、処理むらは観察されなかった。
(Example 5)
In Example 1, the apparent density adjusted product of spongy iron powder was subjected to classification treatment with a cyclone having a classification point of 10 μm, and then subjected to a vibration sieve to remove particle components of 150 μm or more and 75 μm or less. In the same manner as in Example 1, the iron powder for surface finishing according to Example 5 of the present invention was obtained. After the surface finish treatment of the metal product was carried out for 1 m 3 with the obtained iron powder, the treated surface was visually observed, and no treatment unevenness was observed.
（比較例）
実施例１における海綿状鉄粉の微粉砕品に対し、ノボローターミルによる再度の微粉砕処理を実施せず、分級点１０μmのサイクロンにて分級処理を実施した後に、振動ふるいにかけ、１０６μm以下の粒度成分に調整することで、比較例に係る鉄粉を得た。得られた鉄粉で、金属製品の表面仕上げ処理を１ｍ３にわたり実施した後に、処理後の表面を目視観察したところ、処理むらが観察された。
(Comparative example)
The finely pulverized product of the spongy iron powder in Example 1 was subjected to a classification process with a cyclone having a classification point of 10 μm without performing a second pulverization process with a Novorotor mill, and then subjected to a vibration sieve to obtain a particle size of 106 μm or less. The iron powder which concerns on a comparative example was obtained by adjusting to a particle size component. After the surface finish treatment of the metal product was performed for 1 m 3 with the obtained iron powder, the treated surface was visually observed, and treatment unevenness was observed.
表１に、本発明に係る実施例ならびに比較例の鉄粉の粒度分布、組成分析、見掛密度の測定結果をまとめた。
なお、実施例ならびに比較例に係る表面仕上げ用鉄粉の粒度分布の測定結果は以下の通りとなった。
実施例１は、４２５μm超：０．０質量％、２５０μm超４２５μm以下：７６．９質量％、１８０μm超２５０μm以下：２１．６質量％、１８０μm以下：１．５質量％であった。
実施例２は、３００μm超：０．０質量％、１８０μm超３００μm以下：８３．５質量％、１５０μm超１８０μm以下：１３．４質量％、１５０μm以下：３．１質量％であった。
実施例３は、２５０μm超：０．０質量％、１５０μm超２５０μm以下：７９．８質量％、１２５μm超１５０μm以下：１５．８質量％、１２５μm以下：４．４質量％であった。
実施例４は、１８０μm超：０．０質量％、１２５μm超１８０μm以下：６３．５質量％、１０６m超１２５μm以下：２５．０質量％、１０６μm以下：１１．５質量％であった。
実施例５は、１５０μm超：０．５質量％、１０６μm超１５０μm以下：５７．５質量％、７５μm超１０６μm以下：３９．４質量％、７５μm以下：２．６質量％であった。
比較例１は、２５０μm超：０．０質量％、１５０μm超２５０μm以下：０．０質量％、７５μm超１５０μm以下：１８．５質量％、７５μm以下：８１．５質量％であった。
Table 1 summarizes the measurement results of the particle size distribution, composition analysis, and apparent density of the iron powders of Examples and Comparative Examples according to the present invention.
In addition, the measurement result of the particle size distribution of the iron powder for surface finishing which concerns on an Example and a comparative example was as follows.
Example 1 was more than 425 μm: 0.0% by mass, more than 250 μm and not more than 425 μm: 76.9% by mass, more than 180 μm and not more than 250 μm: 21.6% by mass, and not more than 180 μm: 1.5% by mass.
Example 2 was more than 300 μm: 0.0 mass%, more than 180 μm and 300 μm or less: 83.5 mass%, more than 150 μm and 180 μm or less: 13.4 mass%, and 150 μm or less: 3.1 mass%.
Example 3 was more than 250 μm: 0.0 mass%, more than 150 μm and 250 μm or less: 79.8 mass%, more than 125 μm and 150 μm or less: 15.8 mass%, and 125 μm or less: 4.4 mass%.
Example 4 was more than 180 μm: 0.0 mass%, more than 125 μm and 180 μm or less: 63.5 mass%, more than 106 m and 125 μm or less: 25.0 mass%, 106 μm or less: 11.5 mass%.
Example 5 was more than 150 μm: 0.5% by mass, more than 106 μm and 150 μm or less: 57.5% by mass, more than 75 μm and 106 μm or less: 39.4% by mass, and less than 75 μm: 2.6% by mass.
The comparative example 1 was more than 250 micrometers: 0.0 mass%, more than 150 micrometers 250 micrometers or less: 0.0 mass%, more than 75 micrometers 150 micrometers or less: 18.5 mass%, 75 micrometers or less: 81.5 mass%.
実施例１〜５に係る鉄粉では見掛密度が３３００〜３５００ｋｇ／ｍ３であり、金属製品の表面仕上げ処理後の表面には処理むらが観察されなかったが、比較例に係る鉄粉では見掛密度が２５００ｋｇ／ｍ３と低い結果であり、金属製品の表面仕上げ処理後の表面には処理むらが観察された。 In the iron powder according to Examples 1 to 5, the apparent density is 3300 to 3500 kg / m 3 , and no processing unevenness was observed on the surface after the surface finishing treatment of the metal product, but in the iron powder according to the comparative example, The apparent density was as low as 2500 kg / m 3, and treatment unevenness was observed on the surface of the metal product after the surface finishing treatment.
Claims (2)
上記海綿鉄ケーキを破砕処理後に粉砕処理することで海綿状鉄粉の粉砕品を得る工程と、
上記海綿状鉄粉の粉砕品を、見掛密度を３０００ｋｇ／ｍ３以上４０００ｋｇ／ｍ３となるまで繰り返し粉砕する事で、海綿状鉄粉の見掛密度調整品を得る工程と、
上記海綿状鉄粉の見掛密度調整品を分級処理する工程
とを有する、金属製品の表面仕上げ用の還元鉄粉の製造方法。
A process of obtaining sponge iron cake by reducing iron oxide powder;
A step of obtaining a pulverized product of sponge-like iron powder by pulverizing the sponge iron cake after the crushing treatment;
A step of obtaining an apparent density adjusted product of sponge-like iron powder by repeatedly crushing the pulverized product of sponge-like iron powder until the apparent density is 3000 kg / m 3 or more and 4000 kg / m 3 ;
A method for producing reduced iron powder for surface finishing of metal products, comprising a step of classifying an apparent density adjusted product of the sponge iron powder.
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| CN114851094A (en) * | 2021-02-04 | 2022-08-05 | 同和电子科技有限公司 | Abrasive material for shot blasting |
| JP2022119253A (en) * | 2021-02-04 | 2022-08-17 | Ｄｏｗａエレクトロニクス株式会社 | Abrasive for shot-blasting |
| CN114851094B (en) * | 2021-02-04 | 2024-05-28 | 同和电子科技有限公司 | Sweeping material for shot blasting |
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