JPH04236702A - Manufacture of metallic compact body using refined iron powder of converter dust - Google Patents
Manufacture of metallic compact body using refined iron powder of converter dustInfo
- Publication number
- JPH04236702A JPH04236702A JP7813991A JP7813991A JPH04236702A JP H04236702 A JPH04236702 A JP H04236702A JP 7813991 A JP7813991 A JP 7813991A JP 7813991 A JP7813991 A JP 7813991A JP H04236702 A JPH04236702 A JP H04236702A
- Authority
- JP
- Japan
- Prior art keywords
- iron powder
- converter dust
- refined
- refined iron
- converter
- 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
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 52
- 239000000428 dust Substances 0.000 title claims abstract description 38
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
- 229920003986 novolac Polymers 0.000 claims abstract description 14
- 229920005989 resin Polymers 0.000 claims abstract description 11
- 239000011347 resin Substances 0.000 claims abstract description 11
- 229920001187 thermosetting polymer Polymers 0.000 claims abstract description 9
- 239000002184 metal Substances 0.000 claims description 19
- 229910052751 metal Inorganic materials 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 15
- 238000004898 kneading Methods 0.000 claims description 4
- LTGPFZWZZNUIIK-LURJTMIESA-N Lysol Chemical compound NCCCC[C@H](N)CO LTGPFZWZZNUIIK-LURJTMIESA-N 0.000 claims description 2
- 239000002245 particle Substances 0.000 abstract description 13
- 229920003987 resole Polymers 0.000 abstract description 10
- 238000010438 heat treatment Methods 0.000 abstract description 7
- 238000012856 packing Methods 0.000 abstract description 7
- 239000011230 binding agent Substances 0.000 abstract description 6
- 238000009826 distribution Methods 0.000 abstract description 4
- 239000012535 impurity Substances 0.000 abstract description 2
- 238000007670 refining Methods 0.000 abstract description 2
- 239000000843 powder Substances 0.000 description 11
- 238000000465 moulding Methods 0.000 description 10
- 239000005011 phenolic resin Substances 0.000 description 9
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 6
- 239000002994 raw material Substances 0.000 description 6
- 238000005245 sintering Methods 0.000 description 6
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 5
- 238000010304 firing Methods 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 229920001568 phenolic resin Polymers 0.000 description 5
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 229910021529 ammonia Inorganic materials 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 2
- 239000004372 Polyvinyl alcohol Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000001993 wax Substances 0.000 description 2
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- 239000004640 Melamine resin Substances 0.000 description 1
- 229920000877 Melamine resin Polymers 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 229920001807 Urea-formaldehyde Polymers 0.000 description 1
- 239000003377 acid catalyst Substances 0.000 description 1
- 239000000783 alginic acid Substances 0.000 description 1
- 235000010443 alginic acid Nutrition 0.000 description 1
- 229920000615 alginic acid Polymers 0.000 description 1
- 229960001126 alginic acid Drugs 0.000 description 1
- 150000004781 alginic acids Chemical class 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000004203 carnauba wax Substances 0.000 description 1
- 235000013869 carnauba wax Nutrition 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 229920002301 cellulose acetate Polymers 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 229920000609 methyl cellulose Polymers 0.000 description 1
- 239000001923 methylcellulose Substances 0.000 description 1
- 235000010981 methylcellulose Nutrition 0.000 description 1
- 239000004200 microcrystalline wax Substances 0.000 description 1
- 235000019808 microcrystalline wax Nutrition 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920005749 polyurethane resin Polymers 0.000 description 1
- 235000019422 polyvinyl alcohol Nutrition 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Powder Metallurgy (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、転炉ダスト精製鉄粉を
主原料とする金属成形体の製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a metal molded body using converter dust refined iron powder as the main raw material.
【０００２】0002
【従来の技術】近年、産業機械及び金属部品の技術分野
において、積層、鍛造、鋳造等などの方法があるが、成
形性、コスト、技術の面で問題があり、これらの方法で
は製造困難な物や、材質あるいは形状の関係から仕上げ
の面倒な部品等に、例えば、特開平２−１４１５０２号
公報示されるように、金属粉末を主原料として、所望の
形状を有する型に充填し、プレス成形、焼結して部材品
を製造する方法が知られていた。[Prior Art] In recent years, methods such as lamination, forging, and casting have been used in the technical field of industrial machinery and metal parts, but these methods have problems in terms of formability, cost, and technology, and these methods are difficult to manufacture. For example, as disclosed in Japanese Patent Application Laid-open No. 2-141502, metal powder is used as the main raw material to fill a mold with a desired shape and press-form it for objects, parts that are difficult to finish due to material or shape. , a method of manufacturing components by sintering was known.
【０００３】そして、該方法においては、バインダーと
してパラフイン、カルナウバワックス、マイクロクリス
タン、ポリエチレンワックス等のワックス類、アクリル
樹脂、酢酸セルロース、ポリビニールアルコール等の有
機性物質などが使用されている。この金属粉とバインダ
ーの１種又は２種以上を用いて、これらを混練し、この
混練したもの金型に充填しプレス等で加圧成形し、更に
これを、焼結炉にいれて加熱脱脂後約１２５０℃まで昇
温して焼結していた。また、炉内には粉末粒子の酸化を
防ぐために真空装置や、還元雰囲気が必要なため水素ガ
ス、アンモニア分解ガス等が使用されていた。[0003] In this method, waxes such as paraffin, carnauba wax, microcrystalline wax, and polyethylene wax, and organic substances such as acrylic resin, cellulose acetate, and polyvinyl alcohol are used as binders. This metal powder and one or more types of binder are used to knead them, and the kneaded product is filled into a mold and pressure-molded using a press, etc., and then placed in a sintering furnace to be heated and degreased. After that, the temperature was raised to about 1250°C and sintered. In addition, a vacuum device was installed in the furnace to prevent oxidation of the powder particles, and since a reducing atmosphere was required, hydrogen gas, ammonia decomposition gas, etc. were used.
【０００４】0004
【発明が解決しょうとする課題】しかしながら、上記方
法による金属焼結品の製造方法には以下のような問題点
を有していた。
○１１２５０℃という▲高▼温、且つ真空下で焼結が行
われるので、設備が大型で、複雑なものとなり、設備費
の増大を招く。そして、▲高▼温処理であるので脱脂を
行う必要があり、処理工程が複雑となる。
○２▲高▼温度に加熱するので、収縮による変形が起こ
り寸法精度が悪い。
○３加熱脱脂、焼結時に酸化が起こるので、真空または
還元性雰囲気が必要である。
○４従来の粉末冶金法では原料として還元鉄粉や、電解
鉄粉が用いられるので、非常にコスト▲高▼となる。[Problems to be Solved by the Invention] However, the method for manufacturing sintered metal products by the above method has the following problems. Since sintering is performed at a high temperature of 11,250°C and under vacuum, the equipment becomes large and complicated, leading to an increase in equipment costs. Furthermore, since it is a high-temperature treatment, it is necessary to degrease it, making the treatment process complicated. ○2▲ High▼ Since it is heated to a high temperature, deformation occurs due to shrinkage, resulting in poor dimensional accuracy. ○3 Oxidation occurs during heat degreasing and sintering, so a vacuum or reducing atmosphere is required. ○4 Conventional powder metallurgy methods use reduced iron powder or electrolytic iron powder as raw materials, resulting in extremely high costs.
【０００５】一方において、製鉄所の転炉操業中に鉄粉
ダストが舞い上がり、これを集めて精製すれば転炉ダス
ト精製鉄粉（ＯＧＰという）となるが、現在のところ該
転炉ダスト精製鉄粉の有効利用がなされておらず、適当
に塊状化し原料として還元されていた。本発明は上記事
情に鑑みてなされたもので、製鉄所で発生する転炉ダス
ト精製鉄粉の有効利用を図り、更には低コストの転炉ダ
スト精製鉄粉を用いた金属成形体の製造方法を提供する
ことを目的とする。On the other hand, iron powder dust is thrown up during the operation of a converter in a steel mill, and if it is collected and refined, it becomes converter dust refined iron powder (OGP). The powder was not being used effectively and was being lumped into lumps and being reduced as a raw material. The present invention has been made in view of the above circumstances, and aims to effectively utilize converter dust refined iron powder generated in steel works, and furthermore, provides a low-cost method for manufacturing metal molded bodies using converter dust refined iron powder. The purpose is to provide
【０００６】[0006]
【課題を解決するための手段】上記目的に沿う請求項第
１項記載の転炉ダスト精製鉄粉を用いた金属成形体の製
造方法は、転炉ダスト精製鉄粉に少量の熱硬化性樹脂を
添加混練した後、該混練鉄粉を金型に充填し、２ｔ／ｃ
ｍ２以上の圧力下でプレス成形し、該成形体を加熱して
硬化させて構成されている。[Means for Solving the Problems] A method for manufacturing a metal molded body using converter dust refined iron powder according to claim 1, which meets the above object, comprises adding a small amount of thermosetting resin to converter dust refined iron powder. After adding and kneading, the kneaded iron powder was filled into a mold and 2t/c
It is constructed by press molding under a pressure of m2 or more and heating and curing the molded product.
【０００７】また、請求項第２項記載の転炉ダスト精製
鉄粉を用いた金属成形体の製造方法は、特に自動車用カ
ウンターウエイトに適するように、転炉ダストを磨鉱し
その粒度を１０〜７４μｍ；５〜３０％、７４〜１４９
μｍ；５０〜７０％；１４９〜５００μｍ；５〜２０％
とした転炉ダスト精製鉄粉に、適当量のリゾールとノボ
ラックを添加して再混練し、次いで該混練鉄粉を金型に
充填し、２ｔ／ｃｍ２以上の圧力下でプレス成形し、該
成形体を１５０〜２５０℃で焼成して構成されている。[0007] Furthermore, the method for manufacturing a metal molded body using refined iron powder from converter dust according to claim 2 is such that the converter dust is polished to a particle size of 10% so as to be particularly suitable for automobile counterweights. ~74 μm; 5-30%, 74-149
μm; 50-70%; 149-500 μm; 5-20%
Appropriate amounts of Lysol and Novolac are added to the converted converter dust refined iron powder and kneaded again.Then, the kneaded iron powder is filled into a mold, press-molded under a pressure of 2t/cm2 or more, and the molded It is constructed by firing the body at 150 to 250°C.
【０００８】[0008]
【作用】請求項第１項記載の転炉ダスト精製鉄粉を用い
た金属成形体の製造方法においては、転炉ダスト精製鉄
粉に少量の熱硬化性樹脂を添加混練した後、該混練鉄粉
を金型に充填し、２ｔ／ｃｍ２以上の圧力下でプレス成
形しているので、これによって所定の形状の成形体が出
来上がる。そして、これを加熱することによって、熱硬
化性樹脂を硬化させているが、ここで加熱温度は熱硬化
性樹脂の硬化温度まで加熱すれば充分であるので、比較
的低い温度で加熱することになり、これによって製品寸
法の狂いが少なくて済む。[Operation] In the method for manufacturing a metal molded body using converter dust refined iron powder according to claim 1, after adding and kneading a small amount of thermosetting resin to converter dust refined iron powder, the kneaded iron powder is Since the powder is filled into a mold and press-molded under a pressure of 2 t/cm2 or more, a molded article of a predetermined shape is completed. Then, by heating this, the thermosetting resin is cured, but since it is sufficient to heat it to the curing temperature of the thermosetting resin, we decided to heat it at a relatively low temperature. This reduces deviations in product dimensions.
【０００９】請求項第２項記載の転炉ダスト精製鉄粉を
用いた金属成形体の製造方法においては、転炉ダストの
粒度分布を１０〜７４μｍ；５〜３０％、７４〜１４９
μｍ；５０〜７０％；１４９〜５００μｍ；５〜２０％
としているので、粗粒と細粒の混合比率が理想的である
ので、鉄粉の充填密度が極めて▲高▼くなる。次に適当
量のレゾールとノボラックを混入するが、レゾールは０
．５〜２．０重量％、ノボラックは２．０〜５．０重量
％の範囲内が良く、これらの添加量以下であると焼結後
の強度不足をもたらし、これらの添加量以上であると焼
結時に膨張、亀裂が発生する。また、レゾールの添加量
が多過ぎると寸法精度が悪くなるので、減らすようにす
るのが好ましい。次に、金型に投入して２ｔ／ｃｍ２以
上の圧力下が加圧成形を行うが、これによって充填密度
の▲高▼い成形品が製造される。そして、１５０〜２５
０℃の温度が該成形品を焼成するが、これによってフェ
ノール樹脂が硬化する。この場合、温度が▲高▼過ぎる
とフェノール樹脂が飛んでしまい、低過ぎるとフェノー
ル樹脂が硬化しない。[0009] In the method for producing a metal molded body using converter dust refined iron powder according to claim 2, the particle size distribution of the converter dust is 10 to 74 μm; 5 to 30%, 74 to 149 μm;
μm; 50-70%; 149-500 μm; 5-20%
Since the mixing ratio of coarse particles and fine particles is ideal, the packing density of iron powder is extremely high. Next, mix appropriate amounts of resol and novolac, but the resol is 0.
．． 5 to 2.0% by weight, and novolac should preferably be in the range of 2.0 to 5.0% by weight; less than these amounts will result in insufficient strength after sintering, and more than these amounts will result in poor strength. Expansion and cracks occur during sintering. Furthermore, if the amount of resol added is too large, the dimensional accuracy will deteriorate, so it is preferable to reduce the amount. Next, it is put into a mold and subjected to pressure molding under a pressure of 2 t/cm2 or more, thereby producing a molded product with a high packing density. And 150-25
A temperature of 0° C. bakes the molded article, which causes the phenolic resin to harden. In this case, if the temperature is too high, the phenolic resin will fly off, and if the temperature is too low, the phenolic resin will not harden.
【００１０】0010
【実施例】続いて、本発明を具体化した実施例につき説
明し、本発明の理解に供する。酸素転炉操業における発
生ガスを非燃焼状態で処理する際に、捕集される粗粒ダ
ストを精製して転炉ダスト精製鉄粉（ＯＧＰ）を製造し
た。この転炉ダスト精製鉄粉の成分はＴ・Ｆｅ＞９２％
で金属鉄を９０％以上有している。そして、その粒度分
布は多少のバラツキを有するが表１の通りである。原料
の粒度範囲が表１の上限あるいは下限の何れかに外れる
と、充填密度が低下するが、転炉ダスト精製鉄粉は、転
炉に酸素を吹付け精錬時に飛散し、冷却回収されるので
、大粒から小粒が存在した状態となり、この範囲で磨鉱
精製して不純物を除去すれば、鉄粉粒径が表１の範囲に
なる。この範囲で混合充填すると最も効率の良い充填密
度が達成できることになる。[Examples] Next, examples embodying the present invention will be explained to provide an understanding of the present invention. When gas generated during oxygen converter operation is treated in a non-combustible state, coarse dust collected is purified to produce converter dust refined iron powder (OGP). The composition of this converter dust refined iron powder is T・Fe>92%
It contains over 90% metallic iron. The particle size distribution is shown in Table 1, although there is some variation. If the particle size range of the raw material deviates from either the upper or lower limit in Table 1, the packing density will decrease, but since the converter dust refined iron powder is scattered during refining by blowing oxygen into the converter, it is cooled and recovered. , the iron powder particle size will be in the range shown in Table 1 if the iron powder is polished to remove impurities within this range. The most efficient packing density can be achieved by mixing and packing within this range.
【００１１】上記の転炉ダスト精製鉄粉にバインダーと
して熱硬化性樹脂の一例であるフェノール樹脂を所定量
混合するが、バインダーとしてフェノール樹脂を使用し
た理由については以下の通りである。
○１フェノール樹脂は成形性が良く、成形強度が比較的
強い。
○２一般的に使用されている通常のバインダー（例えば
、メチルセルロース、アルギン酸、ポリビニルアルコー
ル）は保形剤であり、１５０〜２５０℃の加熱では強度
は出ない。勿論、高温（例えば１１５０℃）に加熱すれ
ばその間に飛んでしまい、金属粉が焼結して強度を出す
ことができるが、極めて▲高▼い温度に加熱する必要が
ある。一方、上記フェノール樹脂は熱硬化性樹脂である
ので、比較的低温（１５０〜２５０℃）に加熱すること
によってその強度を発揮することができる。
○３フェノール樹脂を使用すると加熱温度が低いので、
適当な材料の配分を選ぶと、この温度から常温まで降下
させても寸法精度が狂わない。A predetermined amount of phenol resin, which is an example of a thermosetting resin, is mixed as a binder into the above-mentioned converter dust refined iron powder.The reason for using the phenol resin as the binder is as follows. ○1 Phenol resin has good moldability and relatively strong molding strength. ○2 Commonly used binders (for example, methyl cellulose, alginic acid, polyvinyl alcohol) are shape retainers, and do not develop strength when heated at 150 to 250°C. Of course, if the metal powder is heated to a high temperature (for example, 1150°C), it will fly away and the metal powder will sinter and become stronger, but it is necessary to heat it to an extremely high temperature. On the other hand, since the phenol resin is a thermosetting resin, it can exhibit its strength by heating to a relatively low temperature (150 to 250°C). ○3 When using phenolic resin, the heating temperature is low, so
If appropriate material distribution is selected, dimensional accuracy will not be lost even if the temperature is lowered from this temperature to room temperature.
【００１２】そして、上記転炉ダスト精製鉄粉にアルカ
リ触媒（フォルマリン／フェノール＝１以上）にて造ら
れた液状のレゾール（Ｒ）を転炉ダスト精製鉄粉に対し
て約１重量％混ぜて、均一に混練した後、酸触媒（フォ
ルマリン／フェノール＝１以下）にて造られた粉末状の
ノボラック（Ｎ）を転炉ダスト精製鉄粉の約３重量％に
なるように添加し、均一に混合する。[0012] Then, about 1% by weight of liquid Resol (R) made with an alkaline catalyst (formalin/phenol = 1 or more) is mixed with the converter dust purified iron powder. After uniformly kneading, powdered novolak (N) made with an acid catalyst (formalin/phenol = 1 or less) was added to the converter dust refined iron powder in an amount of about 3% by weight, Mix evenly.
【００１３】この場合、その添加順序は、レゾール（Ｒ
）が液体でありノボラック（Ｎ）は粉末であるため、ま
ず上述の転炉ダスト精製鉄粉に液体のレゾール（Ｒ）を
添加混練して転炉ダスト精製鉄粉の表面を均一に被い、
その後、粉体のノボラック（Ｎ）を添加して再混練する
と、鉄粉の周囲に均一にノボラック（Ｎ）が付着する。
ここで、レゾール（Ｒ）とノボラック（Ｎ）の添加順序
を逆にするとノボラック（Ｎ）の数珠玉が出来やすく、
転炉ダスト精製鉄粉に均一にノボラック（Ｎ）が付着し
ないという欠点を有する。In this case, the order of addition is resol (R
) is a liquid and novolac (N) is a powder, so first add and knead liquid Resol (R) to the above-mentioned converter dust refined iron powder to uniformly cover the surface of the converter dust refined iron powder,
Thereafter, when powdered novolak (N) is added and kneaded again, novolak (N) is uniformly attached around the iron powder. Here, if the order of addition of resol (R) and novolac (N) is reversed, beads of novolac (N) can be easily formed.
Converter dust has the disadvantage that novolak (N) does not adhere uniformly to refined iron powder.
【００１４】ここでレゾール（Ｒ）は前記した通り、０
．５〜２．０重量％、ノボラック（Ｎ）は２．０〜５．
０重量％の範囲内が良い。この後、該混合物を４５ｍｍ
×７９ｍｍ×１３ｍｍの型に充填して２ｔ／ｃｍ２、５
ｔ／ｃｍ２、７ｔ／ｃｍ２で成形した。[0014] As mentioned above, Resol (R) is 0
．． 5-2.0% by weight, novolak (N) 2.0-5.
It is preferably within the range of 0% by weight. After this, the mixture was poured into 45 mm
Fill a mold of x79mm x 13mm and make 2t/cm2,5
It was molded at t/cm2 and 7t/cm2.
【００１５】次に、この成形品を焼成炉に入れて、大気
中の雰囲気でフェノール樹脂を硬化させたが、その時の
温度を、その強度を十分に発現させる１５０〜２５０℃
とした。[0015] Next, this molded product was placed in a firing furnace and the phenolic resin was cured in the atmosphere, but the temperature at that time was set at 150 to 250°C to fully develop its strength.
And so.
【００１６】また、レゾール（Ｒ）が硬化するときに、
８０〜１３０℃で水分が発生し、ノボラック（Ｎ）が硬
化するときに１３０〜１８０℃でアンモニアが発生する
。そのため、２ｔ／ｃｍ２位の成形圧では成形物の気孔
が比較的大きく、従ってガスが抜けやすく、早い昇温速
度でも膨張、割れ、剥離等は起こらないので、図２に示
すように早い焼成パターンであっても良い。一方、成形
圧が５ｔ／ｃｍ２や７ｔ／ｃｍ２程の成形圧力になると
成形物からのガスが抜け難くなり、製品の膨張、割れ、
剥離の原因となるので、図１のように、ゆっくりした昇
温条件で焼成を行う。[0016] Furthermore, when Resol (R) is cured,
Moisture is generated at 80-130°C, and ammonia is generated at 130-180°C when novolak (N) is cured. Therefore, at a molding pressure of around 2t/cm2, the pores of the molded product are relatively large, so gas easily escapes, and expansion, cracking, peeling, etc. do not occur even at a high temperature increase rate. It may be. On the other hand, when the molding pressure is about 5t/cm2 or 7t/cm2, it becomes difficult for gas to escape from the molded product, causing the product to expand, crack, etc.
Since this may cause peeling, firing is performed under conditions of slow temperature rise, as shown in FIG.
【００１７】以上の工程によって製造された製品の性状
を表２に示す。また、成形圧と製品の嵩比重を図３に示
すが、点線で示す還元鉄粉の場合に比較して、実線で示
す転炉ダスト精製鉄粉の場合には成形圧力が成形圧５ｔ
／ｃｍ２を越えると飽和状態となる。これは転炉ダスト
精製鉄粉が成形時の変形抵抗が大であるからと考えられ
る。従って、転炉ダスト精製鉄粉を用いた金属成形体の
製造方法においては、成形圧は５ｔ／ｃｍ２程度で曲げ
、圧縮とも優れた強度を有することがわかる。なお、表
２の最後の２欄は全体評価は×であったが、比較の為に
掲載した。Table 2 shows the properties of the product manufactured by the above steps. In addition, the molding pressure and bulk specific gravity of the product are shown in Figure 3. Compared to the case of reduced iron powder shown by the dotted line, the molding pressure is 5t for the converter dust refined iron powder shown by the solid line.
/cm2, saturation occurs. This is thought to be because the converter dust refined iron powder has high deformation resistance during molding. Therefore, it can be seen that in the method of manufacturing a metal molded body using converter dust refined iron powder, the molding pressure is about 5 t/cm2, and the molded body has excellent strength in both bending and compression. The last two columns of Table 2 gave an overall evaluation of ×, but are listed for comparison.
【００１８】なお、他の熱硬化性樹脂として、尿素樹脂
、メラミン樹脂、ポリエステル樹脂、ポリウレタン、エ
ポキシ樹脂等がある。[0018] Other thermosetting resins include urea resin, melamine resin, polyester resin, polyurethane, and epoxy resin.
【００１９】[0019]
【発明の効果】請求項第１項及び第２項記載の転炉ダス
ト精製鉄粉を用いた金属成形体の製造方法においては、
以上の説明から明らかなように原料として転炉ダスト精
製鉄粉を使用するため、材料原価が低廉となる。また、
その製造方法においては、比較的低温で樹脂を硬化させ
ているため、設備費が安く、しかも加熱する為のエネル
ギーコストも安い。そして、混合した樹脂が鉄粉の酸化
を防ぐための真空設備や水素ガス、アンモニア分解ガス
等の還元雰囲気の為の設備等も不要となる。更には、加
熱温度が低いので常温降下に伴う熱収縮も小さく、従来
の方法による成形品に比較して寸法精度が良い。特に、
請求項第２項記載の転炉ダスト精製鉄粉を用いた金属成
形体の製造方法のように、自動車の振動防止用カウンタ
ーウエイト（例、４４×７８×１２ｍｍの板からなる）
に適用した場合、従来よりコストが安く、寿命の長い製
品を製造することができる。Effects of the Invention In the method for manufacturing a metal molded body using converter dust refined iron powder according to claims 1 and 2,
As is clear from the above description, since converter dust refined iron powder is used as the raw material, the material cost is low. Also,
In this manufacturing method, the resin is cured at a relatively low temperature, so the equipment cost is low, and the energy cost for heating is also low. Further, there is no need for vacuum equipment to prevent the mixed resin from oxidizing the iron powder, or equipment for a reducing atmosphere such as hydrogen gas or ammonia decomposition gas. Furthermore, since the heating temperature is low, the thermal shrinkage caused by the drop in room temperature is also small, and the dimensional accuracy is better than molded products made by conventional methods. especially,
A counterweight for vibration prevention of an automobile (for example, made of a plate of 44 x 78 x 12 mm), as in the method for producing a metal molded body using converter dust refined iron powder according to claim 2.
When applied to , it is possible to manufacture products with lower cost and longer lifespan than before.
【図１】金属成形体の焼成条件を示すグラフである。FIG. 1 is a graph showing firing conditions for a metal molded body.
【図２】金属成形体の焼成条件を示すグラフである。FIG. 2 is a graph showing firing conditions for a metal molded body.
【図３】成形圧力と嵩比重の関係を示すグラフである。FIG. 3 is a graph showing the relationship between molding pressure and bulk specific gravity.
Claims (2)
樹脂を添加混練した後、該混練鉄粉を金型に充填し、２
ｔ／ｃｍ２以上の圧力下でプレス成形し、該成形体を加
熱して硬化させたことを特徴とする転炉ダスト精製鉄粉
を用いた金属成形体の製造方法。Claim 1: After adding and kneading a small amount of thermosetting resin to converter dust refined iron powder, the kneaded iron powder is filled into a mold, and 2
1. A method for producing a metal molded body using converter dust refined iron powder, characterized in that the molded body is press-formed under a pressure of t/cm2 or more, and the molded body is heated and hardened.
７４μｍ；５〜３０％、７４〜１４９μｍ；５０〜７０
％；１４９〜５００μｍ；５〜２０％とした転炉ダスト
精製鉄粉に、適当量のリゾールとノボラックを添加して
再混練し、次いで該混練鉄粉を金型に充填し、２ｔ／ｃ
ｍ２以上の圧力下でプレス成形し、該成形体を１５０〜
２５０℃で焼成した、特に自動車用カウンターウエイト
に適する転炉ダスト精製鉄粉を用いた金属成形体の製造
方法。[Claim 2] Converter dust is polished to a grain size of 10 to
74 μm; 5-30%, 74-149 μm; 50-70
%; 149-500 μm; Converter dust refined iron powder with a concentration of 5-20%, an appropriate amount of Lysol and Novolak added and kneaded again, then the kneaded iron powder was filled into a mold, and 2t/c
The molded body is press-formed under a pressure of 150 m2 or more.
A method for manufacturing a metal molded body using converter dust refined iron powder fired at 250°C and particularly suitable for automobile counterweights.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7813991A JPH04236702A (en) | 1991-01-19 | 1991-01-19 | Manufacture of metallic compact body using refined iron powder of converter dust |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7813991A JPH04236702A (en) | 1991-01-19 | 1991-01-19 | Manufacture of metallic compact body using refined iron powder of converter dust |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04236702A true JPH04236702A (en) | 1992-08-25 |
Family
ID=13653553
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7813991A Pending JPH04236702A (en) | 1991-01-19 | 1991-01-19 | Manufacture of metallic compact body using refined iron powder of converter dust |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04236702A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010262996A (en) * | 2009-04-30 | 2010-11-18 | Hitachi Metals Ltd | Rare earth permanent magnet and method of manufacturing the same |
| JP2012504189A (en) * | 2008-09-29 | 2012-02-16 | タータ スチール リミテッド | Agglomerate formation method of alloy iron fine powder such as ferromanganese fine powder, ferrochrome fine powder and ferrosilicon fine powder |
| JP2012144784A (en) * | 2011-01-13 | 2012-08-02 | Astec Irie Co Ltd | Method for agglomerating metal iron-containing dust, and agglomerated material |
-
1991
- 1991-01-19 JP JP7813991A patent/JPH04236702A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012504189A (en) * | 2008-09-29 | 2012-02-16 | タータ スチール リミテッド | Agglomerate formation method of alloy iron fine powder such as ferromanganese fine powder, ferrochrome fine powder and ferrosilicon fine powder |
| JP2010262996A (en) * | 2009-04-30 | 2010-11-18 | Hitachi Metals Ltd | Rare earth permanent magnet and method of manufacturing the same |
| JP2012144784A (en) * | 2011-01-13 | 2012-08-02 | Astec Irie Co Ltd | Method for agglomerating metal iron-containing dust, and agglomerated material |
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