JP2011214108A - Method for manufacturing ferrous sintered material - Google Patents
Method for manufacturing ferrous sintered material Download PDFInfo
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- 239000000463 material Substances 0.000 title claims abstract description 20
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 6
- 238000000034 method Methods 0.000 title abstract description 12
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 title abstract 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 44
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000000843 powder Substances 0.000 claims abstract description 26
- 238000009792 diffusion process Methods 0.000 claims abstract description 16
- 235000014113 dietary fatty acids Nutrition 0.000 claims abstract description 14
- 229930195729 fatty acid Natural products 0.000 claims abstract description 14
- 239000000194 fatty acid Substances 0.000 claims abstract description 14
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 13
- 238000005245 sintering Methods 0.000 claims abstract description 10
- 150000004665 fatty acids Chemical class 0.000 claims abstract description 9
- 239000000203 mixture Substances 0.000 claims abstract description 8
- 229910001562 pearlite Inorganic materials 0.000 claims abstract description 8
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 claims abstract description 7
- 238000013329 compounding Methods 0.000 claims abstract 2
- 229910052742 iron Inorganic materials 0.000 claims description 18
- -1 fatty acid aluminum salt Chemical class 0.000 claims description 5
- ULQISTXYYBZJSJ-UHFFFAOYSA-N 12-hydroxyoctadecanoic acid Chemical compound CCCCCCC(O)CCCCCCCCCCC(O)=O ULQISTXYYBZJSJ-UHFFFAOYSA-N 0.000 claims description 4
- UKMSUNONTOPOIO-UHFFFAOYSA-N docosanoic acid Chemical compound CCCCCCCCCCCCCCCCCCCCCC(O)=O UKMSUNONTOPOIO-UHFFFAOYSA-N 0.000 claims description 4
- POULHZVOKOAJMA-UHFFFAOYSA-N dodecanoic acid Chemical compound CCCCCCCCCCCC(O)=O POULHZVOKOAJMA-UHFFFAOYSA-N 0.000 claims description 4
- IPCSVZSSVZVIGE-UHFFFAOYSA-N hexadecanoic acid Chemical compound CCCCCCCCCCCCCCCC(O)=O IPCSVZSSVZVIGE-UHFFFAOYSA-N 0.000 claims description 4
- 235000021355 Stearic acid Nutrition 0.000 claims description 3
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 3
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims description 3
- 239000008117 stearic acid Substances 0.000 claims description 3
- 229940114072 12-hydroxystearic acid Drugs 0.000 claims description 2
- 235000021357 Behenic acid Nutrition 0.000 claims description 2
- 239000005639 Lauric acid Substances 0.000 claims description 2
- 235000021314 Palmitic acid Nutrition 0.000 claims description 2
- 229940116226 behenic acid Drugs 0.000 claims description 2
- 229940033355 lauric acid Drugs 0.000 claims description 2
- WQEPLUUGTLDZJY-UHFFFAOYSA-N n-Pentadecanoic acid Natural products CCCCCCCCCCCCCCC(O)=O WQEPLUUGTLDZJY-UHFFFAOYSA-N 0.000 claims description 2
- 229940098695 palmitic acid Drugs 0.000 claims description 2
- WBHHMMIMDMUBKC-XLNAKTSKSA-N ricinelaidic acid Chemical compound CCCCCC[C@@H](O)C\C=C\CCCCCCCC(O)=O WBHHMMIMDMUBKC-XLNAKTSKSA-N 0.000 claims description 2
- 229960003656 ricinoleic acid Drugs 0.000 claims description 2
- FEUQNCSVHBHROZ-UHFFFAOYSA-N ricinoleic acid Natural products CCCCCCC(O[Si](C)(C)C)CC=CCCCCCCCC(=O)OC FEUQNCSVHBHROZ-UHFFFAOYSA-N 0.000 claims description 2
- 229960004274 stearic acid Drugs 0.000 claims description 2
- TUNFSRHWOTWDNC-HKGQFRNVSA-N tetradecanoic acid Chemical compound CCCCCCCCCCCCC[14C](O)=O TUNFSRHWOTWDNC-HKGQFRNVSA-N 0.000 claims description 2
- 230000001747 exhibiting effect Effects 0.000 claims 1
- 229910002804 graphite Inorganic materials 0.000 abstract description 21
- 239000010439 graphite Substances 0.000 abstract description 21
- 229910052810 boron oxide Inorganic materials 0.000 abstract description 7
- JKWMSGQKBLHBQQ-UHFFFAOYSA-N diboron trioxide Chemical compound O=BOB=O JKWMSGQKBLHBQQ-UHFFFAOYSA-N 0.000 abstract description 7
- 229910052582 BN Inorganic materials 0.000 abstract description 3
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 abstract description 3
- 238000000748 compression moulding Methods 0.000 abstract 1
- 229910045601 alloy Inorganic materials 0.000 description 12
- 239000000956 alloy Substances 0.000 description 12
- 239000011812 mixed powder Substances 0.000 description 10
- 239000002994 raw material Substances 0.000 description 9
- CEGOLXSVJUTHNZ-UHFFFAOYSA-K aluminium tristearate Chemical compound [Al+3].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CEGOLXSVJUTHNZ-UHFFFAOYSA-K 0.000 description 6
- 229940063655 aluminum stearate Drugs 0.000 description 6
- 238000005520 cutting process Methods 0.000 description 6
- 239000011159 matrix material Substances 0.000 description 6
- 239000000314 lubricant Substances 0.000 description 5
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- 239000011593 sulfur Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000010730 cutting oil Substances 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
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- 239000006185 dispersion Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
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Abstract
Description
本発明は、鉄系焼結材料の製造方法に係り、特に、焼結後の金属組織中に未拡散の黒鉛を分散させることにより、被削性を改善する技術に関する。 The present invention relates to a method for producing an iron-based sintered material, and more particularly to a technique for improving machinability by dispersing undiffused graphite in a sintered metal structure.
粉末冶金法による焼結材料は、ニアネットシェイプに造形することができることに加え、一度押型を作製すれば同形状の製品を多量に生産可能であり、製造コストが低廉であるという利点を有していることから、種々の分野で利用されている。しかし、高い精度が要求される部品に適用する場合は、焼結後に機械加工を要することがあり、その場合には良好な被削性が要求される。 Sintered materials by powder metallurgy can be shaped into a near net shape, and have the advantage of being able to produce a large number of products of the same shape once the stamping die is manufactured. Therefore, it is used in various fields. However, when applied to parts that require high accuracy, machining may be required after sintering, in which case good machinability is required.
したがって、このような観点から、鉄系焼結材料の被削性を向上させる目的で、種々の技術が提案されている。原料粉として硫黄を含有する鉄粉を使用したり、硫化物を原料粉に添加、混合する方法や、焼結体を硫化水素ガス雰囲気で硫化処理する方法などが採用されている(特許文献1など)。 Therefore, from such a viewpoint, various techniques have been proposed for the purpose of improving the machinability of the iron-based sintered material. A method of using iron powder containing sulfur as a raw material powder, a method of adding and mixing sulfide to the raw material powder, a method of sulfiding a sintered body in a hydrogen sulfide gas atmosphere, etc. are adopted (Patent Document 1). Such).
また、焼結合金の気孔中に樹脂などを充填する技術も提供されている(特許文献2など)。このような焼結合金では、切削加工中に気孔中の樹脂がチップブレーキングの起点となるため、切屑の分断性が良好である。 In addition, a technique for filling a resin or the like in the pores of a sintered alloy is also provided (Patent Document 2, etc.). In such a sintered alloy, the resin in the pores becomes the starting point of chip breaking during the cutting process, so that the chip breaking property is good.
黒鉛粉を含有する原料粉からなる圧粉体を炭素の拡散温度以下で焼結し、黒鉛を分散させた材料が実用に供されている(特許文献3など)。黒鉛は、固体潤滑剤としての効果があり被削性の改善に有効である。 A material in which a green compact made of a raw material powder containing graphite powder is sintered at a temperature equal to or lower than the diffusion temperature of carbon and graphite is dispersed has been put to practical use (Patent Document 3, etc.). Graphite has an effect as a solid lubricant and is effective in improving machinability.
しかしながら、快削成分である硫黄を焼結合金の基地中に分散させる方法では、被削性の改善には限界がある。また、硫黄は、焼結合金の強度を低下させる元素であり、特に、靭性を低下させる原因になるとともに、焼結合金の腐食を促進するおそれもあるので用途に制限がある。
また、焼結合金の気孔中に樹脂などを充填する方法では、樹脂などの原料コストがかかるとともに、工程も増えるため、焼結材料のコストが上昇してしまう。
炭素の拡散温度以下で焼結を行うことで黒鉛を分散させる方法では、焼結温度が低いために強度が低くなってしまい、強度が必要とされる部材に適用することができない。
However, the method of dispersing sulfur, which is a free-cutting component, in the base of the sintered alloy has a limit in improving machinability. In addition, sulfur is an element that reduces the strength of the sintered alloy, and in particular, it causes a decrease in toughness and may promote corrosion of the sintered alloy, so that its use is limited.
Further, in the method of filling the pores of the sintered alloy with a resin or the like, the cost of the raw material for the resin or the like is increased and the number of processes is increased, so that the cost of the sintered material is increased.
In the method of dispersing graphite by performing sintering at a temperature equal to or lower than the carbon diffusion temperature, the sintering temperature is low, so the strength is low, and it cannot be applied to a member that requires strength.
そこで、本出願人は、炭素の拡散温度以上で焼結しても黒鉛を基地中に分散させることができる材料として、黒鉛粉末を0.1〜2.0質量%含む鉄系混合粉末に酸化硼素を0.01〜1.0質量%添加した混合粉末からなる圧粉体を焼結した、炭素の拡散が抑制されフェライトとパーライトからなる基地組織中に黒鉛が分散した鉄系焼結材料を提案している(特許文献4参照)。 Therefore, the present applicant oxidized iron-based mixed powder containing 0.1 to 2.0% by mass of graphite powder as a material capable of dispersing graphite in the matrix even when sintered at a temperature higher than the diffusion temperature of carbon. An iron-based sintered material obtained by sintering a green compact composed of a mixed powder to which 0.01 to 1.0% by mass of boron is added, in which carbon diffusion is suppressed and graphite is dispersed in a base structure composed of ferrite and pearlite. It has been proposed (see Patent Document 4).
上記の特許文献4の鉄系焼結材料は、焼結温度を高くしても基地中への炭素の拡散が酸化硼素によって抑制され、鉄系焼結合金の基地硬さを低下させて被削性を向上させることができるが、原料粉末に高価な酸化硼素粉末または酸化硼素を含有する窒化硼素粉末を添加するため、原料コストが上昇してしまう。そのため、低廉な製造方法が求められている。 In the iron-based sintered material of Patent Document 4 described above, even when the sintering temperature is increased, the diffusion of carbon into the matrix is suppressed by boron oxide, and the hardness of the iron-based sintered alloy is reduced, thereby reducing the work. However, since expensive boron oxide powder or boron nitride powder containing boron oxide is added to the raw material powder, the raw material cost increases. Therefore, an inexpensive manufacturing method is required.
そこで、本発明は、炭素の拡散を抑制して黒鉛を分散させた被削性に優れる鉄系焼結材料を経済的に提供することを目的とする。 Therefore, an object of the present invention is to economically provide an iron-based sintered material excellent in machinability in which graphite is dispersed by suppressing carbon diffusion.
上記の目的を達成するため、本発明は、焼結後にパーライト組織を呈する鉄系焼結材料用の粉末混合物より黒鉛粉末を除いた鉄系粉末混合物に対し、配合比で、高級脂肪酸のアルミニウム塩粉末を0.05〜1.5質量%と、黒鉛粉末を0.1〜2.0質量%とを添加した粉末混合物からなる圧粉体を炭素の拡散温度以上の温度で焼結することにより、鉄系焼結材料を得ることを特徴とする。 In order to achieve the above object, the present invention provides an aluminum salt of a higher fatty acid in a mixing ratio with respect to an iron-based powder mixture obtained by removing graphite powder from a powder mixture for an iron-based sintered material that exhibits a pearlite structure after sintering. By sintering a green compact made of a powder mixture to which 0.05 to 1.5% by mass of powder and 0.1 to 2.0% by mass of graphite powder are added at a temperature equal to or higher than the diffusion temperature of carbon. An iron-based sintered material is obtained.
本発明によれば、原料粉末に高価な酸化硼素粉末または酸化硼素を含有する窒化硼素粉末を添加することなく、焼結後の金属組織中に未拡散の黒鉛が分散した組織を有して被削性に優れる鉄系焼結合金を得ることができる。 According to the present invention, an expensive boron oxide powder or boron nitride powder containing boron oxide is not added to the raw material powder, and the sintered metal structure has a structure in which undiffused graphite is dispersed. An iron-based sintered alloy having excellent machinability can be obtained.
本発明者は、炭素の拡散を抑制させ黒鉛を分散させた焼結材料を得るため検討を重ねた結果、高級脂肪酸のアルミニウム塩粉末と黒鉛粉末とを添加することにより、黒鉛の拡散が抑制され、フェライトとパーライトからなる基地組織中に黒鉛が分散した組織となって、被削性に優れる鉄系焼結合金を製造することができることを見出した。 As a result of repeated investigations to obtain a sintered material in which graphite is dispersed by suppressing carbon diffusion, the present inventor has suppressed the diffusion of graphite by adding a higher fatty acid aluminum salt powder and graphite powder. It has been found that an iron-based sintered alloy having excellent machinability can be produced by forming a structure in which graphite is dispersed in a matrix structure composed of ferrite and pearlite.
次に、本発明の成分組成について説明する。高級脂肪酸のアルミニウム塩粉末の量は、0.05質量%未満では黒鉛の拡散を抑制させずに鉄系焼結合金はパーライト組織となる。また、1.5質量%を超えて添加してもこれ以上の炭素の拡散抑制効果は見られないばかりでなく、混合粉末の理論密度を低下させて圧粉体の密度が高くできないため、材料強度を低下させるとともに、混合粉末の流動性を低下させるため、金型への充填性を悪化させる。このため、高級脂肪酸のアルミニウム塩粉末の最適添加量の範囲を、0.05〜1.5質量%とした。なお、この粉末は通常用いられる平均粒径1〜30μm程度のものであればよい。平均粒径が1μm未満であると、凝集しやすくなり、30μmを超えると混合粉末中での均一分散が困難になる。 Next, the component composition of the present invention will be described. If the amount of the higher fatty acid aluminum salt powder is less than 0.05% by mass, the iron-based sintered alloy has a pearlite structure without suppressing the diffusion of graphite. Moreover, even if added over 1.5% by mass, not only the carbon diffusion suppression effect is not seen any more, but also the density of the green compact cannot be increased by lowering the theoretical density of the mixed powder. In order to reduce the strength and the fluidity of the mixed powder, the filling property into the mold is deteriorated. For this reason, the range of the optimal addition amount of the aluminum salt powder of the higher fatty acid was set to 0.05 to 1.5% by mass. In addition, this powder should just be a thing with the average particle diameter of about 1-30 micrometers normally used. When the average particle size is less than 1 μm, aggregation tends to occur, and when it exceeds 30 μm, uniform dispersion in the mixed powder becomes difficult.
また、高級脂肪酸のアルミニウム塩を構成する高級脂肪酸は、ステアリン酸、12−ヒドロキシステアリン酸、ラウリン酸、ミリスチン酸、パルミチン酸、リシノール酸、ベヘン酸の少なくとも1種であると、混合粉末の圧粉成形時に潤滑剤としても作用するため、成形潤滑剤を別途添加する必要も無く、原料コストおよび混合粉末の理論密度の両面で好ましい。なお、圧粉成形金型から圧粉体を抜き出す際の潤滑性が不足する場合には、他の潤滑剤を併せて添加してもよいが、混合粉末の理論密度が低下するため、添加量は、高級脂肪酸のアルミニウム塩との合計で1.5質量%以下であることが好ましい。 The higher fatty acid constituting the higher fatty acid aluminum salt is at least one of stearic acid, 12-hydroxystearic acid, lauric acid, myristic acid, palmitic acid, ricinoleic acid, and behenic acid. Since it also acts as a lubricant during molding, it is not necessary to add a molding lubricant separately, which is preferable in terms of both raw material cost and the theoretical density of the mixed powder. In addition, if the lubricity when extracting the green compact from the green compacting mold is insufficient, other lubricants may be added together, but the added amount because the theoretical density of the mixed powder decreases. Is preferably 1.5% by mass or less in total with the aluminum salt of the higher fatty acid.
また、黒鉛粉末の添加量は、0.1質量%未満では基地中に拡散する炭素の量が少なく所望の強度が得られないばかりでなく、未拡散の黒鉛量も少なく被削性改善の効果が少ない。また、2.0質量%を超えて添加した場合は、パーライト組織となり被削性を低下させるため、高級脂肪酸のアルミニウム塩粉末の添加量を多くする必要があるが、その被削性改善におよぼす効果は少ないため、黒鉛の最適添加量の範囲を0.1〜2.0質量%とした。 Further, if the amount of graphite powder added is less than 0.1% by mass, not only the amount of carbon diffusing into the matrix is small and the desired strength cannot be obtained, but also the amount of undiffused graphite is small and the effect of improving machinability. Less is. Moreover, when added over 2.0% by mass, it becomes a pearlite structure and the machinability is lowered, so it is necessary to increase the amount of aluminum salt powder of higher fatty acid, but this will improve the machinability. Since the effect is small, the range of the optimum addition amount of graphite is set to 0.1 to 2.0% by mass.
表1に示す配合比で原料粉末を用意し、これをV型ミキサーで30分間混合した後に、混合粉末を密度6.8Mg/m3に圧粉成形し、外径50mm、内径30mm、高さ25mmの圧粉体を各5個づつ作製した。次いで、それぞれの圧粉体を1130℃の還元性ガス(分解アンモニアガス)雰囲気で30分間加熱して焼結した。ここでは、高級脂肪酸のアルミニウム塩としてステアリン酸アルミニウム(Al−St)を用いた。また、ステアリン酸アルミニウムを含まない試料1および試料8については、圧粉成形用の潤滑剤としてステアリン酸亜鉛(Zn−St)を添加した。 After preparing the raw material powder with the blending ratio shown in Table 1 and mixing it with a V-type mixer for 30 minutes, the mixed powder is compacted to a density of 6.8 Mg / m 3 and has an outer diameter of 50 mm, an inner diameter of 30 mm, and a height. Five pieces of 25 mm green compacts were produced. Subsequently, each green compact was sintered by heating in a reducing gas (decomposed ammonia gas) atmosphere at 1130 ° C. for 30 minutes. Here, aluminum stearate (Al-St) was used as the aluminum salt of the higher fatty acid. Moreover, about the sample 1 and the sample 8 which do not contain aluminum stearate, zinc stearate (Zn-St) was added as a lubricant for compacting.
各焼結体に対して切削試験を行い、工具刃先の逃げ面摩耗幅を工具摩耗量として評価した。切削試験は、ダイヤモンド製のスローアウエイチップを用いてNC旋盤で行い、切削速度を300mm/分、送りを0.03mm/rev、切込量を0.10mmとし、水溶性切削油を用いて4000mの距離を切削した。工具逃げ面を、切削距離800m、1600m、2400m、3200mおよび4000mにおいて走査型電子顕微鏡(SEM)で観察して、工具摩耗量を測定した。測定結果を表1に併せて示した。 A cutting test was performed on each sintered body, and the flank wear width of the tool edge was evaluated as the amount of tool wear. The cutting test was performed on an NC lathe using a diamond throwaway tip, the cutting speed was 300 mm / min, the feed was 0.03 mm / rev, the depth of cut was 0.10 mm, and water-soluble cutting oil was used to make 4000 m. Cut the distance. The tool flank face was observed with a scanning electron microscope (SEM) at cutting distances of 800 m, 1600 m, 2400 m, 3200 m, and 4000 m to measure the amount of tool wear. The measurement results are also shown in Table 1.
試料1〜8の結果から、ステアリン酸アルミニウムを0.05質量%以上添加することで、ステアリン酸亜鉛を添加した試料1よりも工具摩耗量が著しく少なくなることが判った。また、本発明によれば、特許文献4に記載の被削性改善材である試料8と同等以上の被削性が得られることが確認された。ただし、ステアリン酸アルミニウムの添加量が1.5質量%を上回る試料7では、被削性は良好であるが混合粉末の理論密度が低下し、圧粉体の高密度化による強度向上ができないとともに、混合粉末の流動性が低下して金型への充填性が悪化することが確認された。このことから、高級脂肪酸のアルミニウム塩の添加量は、0.05〜1.5質量%が好ましいことが判った。 From the results of Samples 1 to 8, it was found that the amount of tool wear was remarkably reduced by adding 0.05% by mass or more of aluminum stearate as compared with Sample 1 to which zinc stearate was added. Moreover, according to this invention, it was confirmed that the machinability equivalent to or more than the sample 8 which is a machinability improving material described in Patent Document 4 can be obtained. However, in Sample 7 in which the amount of aluminum stearate added exceeds 1.5 mass%, the machinability is good, but the theoretical density of the mixed powder is lowered, and the strength cannot be improved by increasing the density of the green compact. It was confirmed that the fluidity of the mixed powder was lowered and the filling property into the mold was deteriorated. From this, it was found that the addition amount of the higher fatty acid aluminum salt is preferably 0.05 to 1.5% by mass.
ステアリン酸アルミニウムとステアリン酸亜鉛は、ともにステアリン酸の金属塩であるが、ステアリン酸亜鉛には鉄系焼結合金基地への黒鉛の拡散を抑制する効果がない。従って、そのメカニズムは未解明であるが、アルミニウムが何らかの作用により鉄系焼結合金基地への黒鉛の拡散を抑制しているものと推定される。 Both aluminum stearate and zinc stearate are metal salts of stearic acid, but zinc stearate has no effect of suppressing the diffusion of graphite into the iron-based sintered alloy matrix. Therefore, although the mechanism is not yet elucidated, it is presumed that aluminum suppresses the diffusion of graphite to the iron-based sintered alloy matrix by some action.
試料9〜14の結果から、黒鉛を0.1質量%以上添加することで、黒鉛を添加しない試料9よりも工具摩耗量が著しく少なくなることが判った。また、黒鉛添加量が2.0質量%を上回る試料14では、パーライトが生成されたために工具摩耗量が増加した。このことから、黒鉛の添加量は、0.1〜2.0質量%が好ましいことが判った。 From the results of Samples 9 to 14, it was found that the amount of tool wear was remarkably reduced by adding 0.1% by mass or more of graphite as compared with Sample 9 to which no graphite was added. Further, in Sample 14 in which the amount of graphite added exceeds 2.0% by mass, tool wear increased because pearlite was generated. From this, it was found that the addition amount of graphite is preferably 0.1 to 2.0% by mass.
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CN104550922A (en) * | 2014-12-25 | 2015-04-29 | 铜陵市经纬流体科技有限公司 | Powder metallurgy material for high-finish-degree valve and preparation method of powder metallurgy material |
KR20190119353A (en) * | 2018-04-12 | 2019-10-22 | 한국과학기술원 | Boron-nitride nanoplatelets/metal nanocomposite powder and method of manufacturing thereof |
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JPS58126959A (en) * | 1982-01-22 | 1983-07-28 | Mitsubishi Metal Corp | Sintered material having cast iron structure and its manufacture |
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CN104550922A (en) * | 2014-12-25 | 2015-04-29 | 铜陵市经纬流体科技有限公司 | Powder metallurgy material for high-finish-degree valve and preparation method of powder metallurgy material |
KR20190119353A (en) * | 2018-04-12 | 2019-10-22 | 한국과학기술원 | Boron-nitride nanoplatelets/metal nanocomposite powder and method of manufacturing thereof |
KR102191865B1 (en) | 2018-04-12 | 2020-12-17 | 한국과학기술원 | Boron-nitride nanoplatelets/metal nanocomposite powder and method of manufacturing thereof |
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