JPS63137137A - Sintered steel excellent in machinability - Google Patents
Sintered steel excellent in machinabilityInfo
- Publication number
- JPS63137137A JPS63137137A JP28070086A JP28070086A JPS63137137A JP S63137137 A JPS63137137 A JP S63137137A JP 28070086 A JP28070086 A JP 28070086A JP 28070086 A JP28070086 A JP 28070086A JP S63137137 A JPS63137137 A JP S63137137A
- Authority
- JP
- Japan
- Prior art keywords
- graphite powder
- powder
- sintered steel
- machinability
- sintered
- 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
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 32
- 239000010959 steel Substances 0.000 title claims abstract description 32
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 29
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 21
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 claims abstract description 15
- 239000000203 mixture Substances 0.000 claims abstract description 5
- 238000002844 melting Methods 0.000 abstract description 9
- 230000008018 melting Effects 0.000 abstract description 9
- 239000000654 additive Substances 0.000 abstract description 7
- 238000002156 mixing Methods 0.000 abstract description 7
- 238000005245 sintering Methods 0.000 abstract description 7
- 239000002994 raw material Substances 0.000 abstract description 6
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 abstract description 4
- 229910001634 calcium fluoride Inorganic materials 0.000 abstract description 4
- 230000000996 additive effect Effects 0.000 abstract description 2
- 150000002222 fluorine compounds Chemical class 0.000 abstract 3
- 229910001632 barium fluoride Inorganic materials 0.000 abstract 1
- 230000006866 deterioration Effects 0.000 abstract 1
- 229910001635 magnesium fluoride Inorganic materials 0.000 abstract 1
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 229910001637 strontium fluoride Inorganic materials 0.000 abstract 1
- FVRNDBHWWSPNOM-UHFFFAOYSA-L strontium fluoride Chemical compound [F-].[F-].[Sr+2] FVRNDBHWWSPNOM-UHFFFAOYSA-L 0.000 abstract 1
- 238000005520 cutting process Methods 0.000 description 21
- 229910001618 alkaline earth metal fluoride Inorganic materials 0.000 description 12
- 239000002245 particle Substances 0.000 description 11
- 239000000843 powder Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 230000007423 decrease Effects 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 description 4
- 238000005275 alloying Methods 0.000 description 3
- 229910052711 selenium Inorganic materials 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 229910021382 natural graphite Inorganic materials 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000004663 powder metallurgy Methods 0.000 description 2
- 229910052714 tellurium Inorganic materials 0.000 description 2
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 150000001342 alkaline earth metals Chemical group 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910001567 cementite Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229910001512 metal fluoride Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000009700 powder processing Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分野〉
本発明は、弗化物を添加した鉄粉末を用いた粉末加工に
よる切削性の優れた焼結鋼の製造方法に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for producing sintered steel with excellent machinability by powder processing using iron powder added with fluoride.
〈従来の技術〉
従来から粉末冶金法によって製造される焼結機械部品は
成形・焼結により所要の寸法・形状に製造され、切削な
どの機械加工を行なうのはまれであった。近年、焼結機
械部品の高精度化や複雑形状化による形状上の制約等か
らやむを得ず切削する焼結部品が増加してきた。一般に
焼結鋼は、残存する空孔のため断続切削になること、お
よび熱伝導性に劣ることから、その切削性は溶装鋼に比
較して極めて劣っている。この欠点を改善するため溶製
鋼で有用な快削元素Ｐｂ、Ｂｉ 、Ｓ 、Ｓｅ、Ｔｅ。<Prior Art> Conventionally, sintered machine parts manufactured by powder metallurgy have been manufactured into desired dimensions and shapes by molding and sintering, and machining such as cutting has rarely been performed. In recent years, there has been an increase in the number of sintered parts that must be cut due to shape constraints due to higher precision and more complex shapes of sintered machine parts. In general, sintered steel has extremely poor machinability compared to welded steel because it requires interrupted cutting due to remaining pores and has poor thermal conductivity. To improve this drawback, free-cutting elements Pb, Bi, S, Se, and Te are useful in molten steel.
ＭｎＳ、 ＢａＳ、ＣａＳ 、 Ｂａ５Ｏ，、Ｃ
ａ５Ｏａ等を鉄１５）に合金化して添加する方法あるい
は混合添加する方法が検討された（特公昭４６−３９５
６４号、特公昭５２−１６６８４号参照）。MnS, BaS, CaS, Ba5O,,C
A method of alloying and adding a5Oa etc. to iron 15) or a method of adding it in a mixed manner was investigated (Japanese Patent Publication No. 46-395).
64, Special Publication No. 52-16684).
しかし、例えばｐｂは融点が約３３０℃と極端に低く、
しかも鉄中に合金せず焼結鋼に均一に分散させることが
困難である。また、Ｓ、Ｓｅ、Ｔｅを鉄粉中に固溶させ
た７トマイズ鉄粉があるが、Ｓ、Ｓｅ。However, for example, PB has an extremely low melting point of about 330°C.
Furthermore, it does not alloy in iron and is difficult to uniformly disperse in sintered steel. In addition, there is 7tomized iron powder in which S, Se, and Te are dissolved in iron powder, but S, Se.
Ｔｅは焼結鋼のマトリックスを脆化させてノツチ効果に
より切削性を改善させるので焼結鋼の場合強度低下が著
しい、また、特にＳの場合には焼結中発生したＭｚＳが
焼結炉耐火物および発熱体をｔ員傷させるので好ましく
ない、その他ではｉｊｌ： Ｉ）にＢａｄ。Te embrittles the matrix of sintered steel and improves machinability through the notch effect, resulting in a significant decrease in strength in the case of sintered steel.In addition, especially in the case of S, MzS generated during sintering increases the refractoriness of the sintering furnace. It is undesirable because it damages objects and heating elements. In other cases, it is bad for I).
Ｃａｂ、 Ｂａ５０ａ、 またはＣａ５Ｏ，を添加混合
して快削性焼結鋼を得る方法も提案されているが、切削
性は改善されるものの前述したように焼結中にＨ，Ｓを
発生すること、および焼結後にＢａＳ 、 ＣａＳが吸
水性を有していて焼結鋼が錆易いという欠点があった。A method of obtaining free-cutting sintered steel by adding and mixing Cab, Ba50a, or Ca5O has also been proposed, but although the machinability is improved, as mentioned above, H and S are generated during sintering. , and that BaS and CaS have water absorption properties after sintering, resulting in the sintered steel being susceptible to rust.
〈発明が解決しようとする問題点〉
本発明は、溶製鋼で有用な快削元素を添加した焼結鋼に
は前述のような問題点があるので、その“問題点を克服
し、切削性に優れた焼結鋼に関するものである。<Problems to be Solved by the Invention> Since sintered steel to which free-cutting elements useful in molten steel are added has the above-mentioned problems, the present invention aims to overcome the problems and improve machinability. This relates to sintered steel with excellent properties.
〈商題点を解決するための手段〉
本発明者らは、焼結鋼の快削性向上のため、硫化物系以
外の添加物について検討した結果、切削温度近傍の温度
に融点を存するアルカリ土類金属の弗化物を原料鉄粉に
混合させる゛ことが好結果をもたらすとの知見を得、こ
の知見にもとづいて本発明をなすに至った。<Means for Solving the Commercial Problems> As a result of studying additives other than sulfide-based additives to improve the free machinability of sintered steel, the present inventors discovered that alkali additives having a melting point near the cutting temperature We have found that mixing earth metal fluorides with raw iron powder brings about good results, and based on this knowledge, we have accomplished the present invention.
本発明は、原料鉄粉に対し、０．１〜１．２重量％に相
当するアルカリ土類弗化物の一部または全量を表面に付
着させた黒鉛粉を、前記原料鉄粉に添加、混合して焼結
する切削性に優れた焼結鋼である。In the present invention, graphite powder having a part or the entire amount of alkaline earth fluoride adhered to the surface of the raw material iron powder in an amount of 0.1 to 1.2% by weight is added to and mixed with the raw material iron powder. This is a sintered steel with excellent machinability.
すなわち、予め黒鉛粉にアルカリ土類金属の弗化物をそ
の融点によって、一部または全量を表面に付着させた後
鉄粉に添加混合して用いることにより、焼結時の黒鉛粉
と鉄粉との合金化を抑制し、空孔内にわずかのｆｒｅｅ
Ｃを残存させ、そのｆｒｅｅ Ｃの潤滑性によって焼
結鋼の切削性を向上させ、また同時にアルカリ土類金属
弗化物を焼結鋼に均一分散させ切削性を改善した。In other words, a part or all of alkaline earth metal fluoride is attached to the surface of graphite powder depending on its melting point, and then added to iron powder and mixed. suppresses alloying of
By allowing C to remain, the machinability of the sintered steel was improved by the lubricity of the free C, and at the same time, the alkaline earth metal fluoride was uniformly dispersed in the sintered steel to improve the machinability.
なお、使用するアルカリ土類金属弗化物の融点が低い時
には、その弗化物全量を予め黒鉛粉に付着させ、逆に融
点が高い時には、その弗化物の一部を黒鉛粉に付着させ
残りを弗化物付着黒鉛粉と一緒に添加混合し、つぎに成
形、焼結して焼結鋼を製造する。このような製造方法に
よって、焼結鋼内の空孔内にわずかに残存しているｆｒ
ｅｅ Ｃの潤滑性と、均一に分散しているアルカリ土類
金属弗化物とによって焼結鋼の切削性の向上が達成でき
た。切削温度近傍の融点を有するアルカリ土類金属弗化
物は、切削時に発生する切削熱によって一部融解し、焼
結鋼の切削抵抗を著しく減少し、焼結鋼の切削性を向上
させる。常温でのこの焼結鋼の機械的強度や寸法変化は
、アルカリ土類金属部、化物の添加、混合によって従来
の焼結鋼に比べて極端に変化することはなかった。When the melting point of the alkaline earth metal fluoride to be used is low, the entire amount of the fluoride is attached to the graphite powder in advance, whereas when the melting point is high, a part of the fluoride is attached to the graphite powder and the rest is attached to the graphite powder. It is added and mixed together with compound-attached graphite powder, and then molded and sintered to produce sintered steel. Through this manufacturing method, a small amount of fr remaining in the pores in the sintered steel
The lubricity of ee C and the uniformly dispersed alkaline earth metal fluoride made it possible to improve the machinability of sintered steel. Alkaline earth metal fluorides, which have a melting point near the cutting temperature, are partially melted by the cutting heat generated during cutting, significantly reducing the cutting resistance of sintered steel and improving the machinability of sintered steel. The mechanical strength and dimensional changes of this sintered steel at room temperature did not change drastically compared to conventional sintered steel due to the addition and mixing of alkaline earth metal parts and compounds.
〈作 用〉
以下に適正弗化物含有率、アルカリ土類金属弗化物、粒
度などについて説明する。<Function> The appropriate fluoride content, alkaline earth metal fluoride, particle size, etc. will be explained below.
アルカリ土類金属の弗化物が０．１％未満の添加である
と黒鉛粉に付着する弗化物量が少なく通常の１０００℃
以上の焼結温度では黒鉛粉全量が鉄粉と反応してセメン
タイト析出を生じ、切削工具への潤滑作用がなくなって
切削工具の摩耗が著しくなる。また、焼結鋼に分散した
弗化物のみだけでは少量すぎて切削性の改善が見られな
い。When less than 0.1% of alkaline earth metal fluoride is added, the amount of fluoride adhering to graphite powder is small and the temperature at 1000℃ is lower than normal.
At the above sintering temperature, the entire graphite powder reacts with the iron powder to form cementite precipitation, which loses its lubricating effect on the cutting tool and causes significant wear of the cutting tool. Furthermore, if only fluoride is dispersed in sintered steel, the amount is too small to improve the machinability.
一方、１．２％を超えるアルカリ土類金属弗化物の添加
であると、実施例１の第３図に示すように切削抵抗のひ
とつである主分力および切削工具の横逃げ面摩耗量は添
加量とともに直線的に改善されて好ましいのであるが、
第２図に示すように圧縮性が低下するため機械的強度も
極端に低下するので好ましくない。On the other hand, if more than 1.2% of alkaline earth metal fluoride is added, as shown in FIG. It is preferable that it improves linearly with the amount added, but
As shown in FIG. 2, the compressibility is lowered and the mechanical strength is also extremely lowered, which is not preferable.
ここで本発明におけるアルカリ土類金属弗化物とは、１
２００℃以上の融点を有する ＭｇＦ＊ 、 ＣａＦｚ
。Here, the alkaline earth metal fluoride in the present invention is 1
MgF*, CaFz with a melting point of 200°C or higher
.
ＳｒＦ、 、 ＢａＦ、の４種類であり、ＢｅＦ、は低
融点のため本発明から除外する。また、その粒度は黒鉛
粉に付着させるため４４μｍ以下好ましくは１０μｍ以
下がよい、なお、その他使用する鉄粉、黒鉛粉、Ｃｕ粉
、ステアリン酸亜鉛等の固体金型潤滑剤は、粉末冶金で
用いる普通の粒度のもので十分であり特に制限はしない
。There are four types: SrF, , BaF, and BeF is excluded from the present invention because of its low melting point. In addition, the particle size is preferably 44 μm or less, preferably 10 μm or less in order to adhere to the graphite powder. In addition, other solid mold lubricants such as iron powder, graphite powder, Cu powder, and zinc stearate are used in powder metallurgy. A particle of normal particle size is sufficient and there are no particular restrictions.
つぎに、黒鉛粉表面にアルカリ土類金属の弗化物を付着
させる方法としては、アルカリ土類金属弗化物の粒度を
黒鉛粉粒度の１７１０程度に細かく粉砕しておき、両者
を市販の混合機あるいは造粒機を用いて表面改質処理す
ることにより、大きな黒鉛粉表面に細かなアルカリ土類
金属弗化物が付着した複合粉を簡単に得ることができる
。必要ならさらに、粉砕機を用いて軽く粉砕してより膜
厚を均−にコーティングすることが可能である。Next, as a method for attaching the alkaline earth metal fluoride to the surface of the graphite powder, the particle size of the alkaline earth metal fluoride is finely ground to about 1710 the particle size of the graphite powder, and both are mixed using a commercially available mixer or By performing surface modification treatment using a granulator, it is possible to easily obtain a composite powder in which fine alkaline earth metal fluorides are attached to the surface of a large graphite powder. If necessary, it is possible to further coat the film evenly by pulverizing it lightly using a pulverizer.
〈実施例〉
（実施例１）
原料粉末として、粒度１５０μｍ以下のミルスケール還
元鉄粉、４Ｃｃｒｍ以下のＣａＦｚ 、 ５０ｐ ｍ以
下の天然黒鉛粉、１００μｍ以下の電解Ｃａ粉およびス
テアリン酸亜鉛を用いた。<Example> (Example 1) As raw material powders, mill-scale reduced iron powder with a particle size of 150 μm or less, CaFz with a particle size of 4 Ccrm or less, natural graphite powder with a particle size of 50 pm or less, electrolytic Ca powder with a particle size of 100 μm or less, and zinc stearate were used.
ＣａＦ、は添加量の半分を黒鉛粉に付着させ、残り半分
をＣａＦ！付着黒鉛粉、電解Ｃａ粉として、Ｆｅ−３％
Ｃｕ −０，９％Ｃ−Ｘ％ ＣａＦｚにしさらにステア
リン酸亜鉛を１．０％加えて混合し、成形圧力５ｔ／ｄ
で抗折力、引張強さの試験に用いる試験片および内径２
０１−φ外径６０■−φのリング試験片を成形した。Half of the amount of CaF added is attached to graphite powder, and the remaining half is CaF! Fe-3% as adhered graphite powder and electrolytic Ca powder
Cu -0.9%C-X% CaFz was further mixed with 1.0% zinc stearate, and the molding pressure was 5t/d.
Test piece used for transverse rupture strength and tensile strength tests and inner diameter 2
A ring test piece with an outer diameter of 01-φ and 60 cm-φ was molded.
その後、Ｊ １１ ／ｗｉｎ 、 Ｈｚ ３１ ／１１
ｉｎの雰囲気中にて６００℃で３０ｍ＋ｎ間脱ろう後１
１３０℃で３０ａ＋ｉｎ間焼結した。切削条件は以下の
通りである。Then J 11 /win, Hz 31 /11
After dewaxing for 30m+n at 600℃ in an atmosphere of 1
It was sintered at 130°C for 30a+in. The cutting conditions are as follows.
試験片・・・内径２０ｍａφ、外径６０ｍｍφ、高さ２
００Ｘ３個
切込み・・・１．５ａｍ
送 リ・・・０．２５ｍ■／回転
切削速度−１００ｍ ／１ａｉｎ
切削距離・・・２２４ｍ
切削工具・・・ＪＩＳ ＰＩＯ種
焼結後の抗折力用試験片の長さ方向の寸法変化を第１図
に、引張強さ、伸びを第２図に、切削抵抗のひとつであ
る主分力、切削工具の横逃げ面摩耗量を第３図に示した
。また、第１表には切削切粉を分析した結果を示す。Test piece: inner diameter 20maφ, outer diameter 60mmφ, height 2
００ Figure 1 shows the dimensional change in the length direction, Figure 2 shows the tensile strength and elongation, and Figure 3 shows the principal component force, which is one of the cutting resistances, and the amount of wear on the flank flank of the cutting tool. Furthermore, Table 1 shows the results of analyzing cutting chips.
第１図から、ＣａＦ、の添加量が増加すると寸法変化が
膨張傾向になるが、その差はわずかであることがわかる
。From FIG. 1, it can be seen that as the amount of CaF added increases, the dimensional change tends to expand, but the difference is small.
第 １ 表
（単位 重量％）
第２図から、ＣａＦｚ添加量が１．２％を超えると、引
張強さおよび体びが低下するのがわかる。Table 1 (Unit: Weight %) From FIG. 2, it can be seen that when the amount of CaFz added exceeds 1.2%, the tensile strength and body length decrease.
第３図から、切削抵抗のひとつである主分力が（ａＦｚ
の添加量の増加とともにほぼ直線的に低下しており、こ
れは第１表に示すｆｒｅｅ Ｃによる切削工具の潤滑性
のためと焼結鋼中に分散されたＣａＦ２の量が増加した
ためである。また、同様の理由から４！逃げ面摩耗量も
ＣａＦ、の増加とともに直線的に低下している。従って
、焼結鋼の機械的強度を保ったままで切削性を改善する
にはＣａＦｌがＱ、１〜１．２％の範囲が好ましいこと
がわかる。From Figure 3, we can see that the principal force, which is one of the cutting forces, is (aFz
It decreases almost linearly as the amount of CaF2 added increases, and this is due to the lubricity of the cutting tool due to free C shown in Table 1 and the increase in the amount of CaF2 dispersed in the sintered steel. Also, for the same reason, 4! The amount of flank wear also decreases linearly as CaF increases. Therefore, it can be seen that in order to improve the machinability of the sintered steel while maintaining its mechanical strength, it is preferable that CaFl is in the range of Q and 1 to 1.2%.
（実施例２）
実施例１と同粒度のミルスケール還元鉄粉、天然黒鉛粉
、電解Ｃａ粉、ＭｇＦｚ 、 ＢａＦｚ 、 ５ｒＦｚ
およびステアリン酸亜鉛を用い（Ｆｅ残余部−３％Ｃｕ
−０，９％Ｃ−０，３％弗化物）＋１．０％Ｚｎ５ｔ
、に混合した。(Example 2) Mill scale reduced iron powder with the same particle size as Example 1, natural graphite powder, electrolytic Ca powder, MgFz, BaFz, 5rFz
and zinc stearate (Fe remainder - 3% Cu)
-0,9%C-0,3% fluoride) +1.0%Zn5t
, mixed with.
なお、比較例では弗化物を黒鉛粉に付着しないで用い、
本発明例ではＳｒＦ、のみ混合量の半量を黒鉛粉に付着
してから上記組成に混合し、Ｍｇｌ”、とＢａＦｚは全
量黒鉛粉に付着させてから添加混合し、実施例１と同（
、；試験片を得た。In addition, in the comparative example, fluoride was used without adhering to graphite powder,
In the example of the present invention, only half of the mixed amount of SrF was attached to the graphite powder and then mixed to the above composition, and the entire amount of Mgl" and BaFz were attached to the graphite powder and then added and mixed.
, ; A test piece was obtained.
寸法変化を第４図に、引張強さ、伸びを第５図に、主分
力、横逃げ面摩耗量を第６図に、第２表には切削切粉分
析値を示す。Figure 4 shows the dimensional changes, Figure 5 shows the tensile strength and elongation, Figure 6 shows the principal force and side flank wear amount, and Table 2 shows the cutting chip analysis values.
第４図から、黒鉛粉に予め弗化物を付着させない比較例
はいずれも寸法変化が本発明例よりも収縮傾向にある。As can be seen from FIG. 4, in all the comparative examples in which fluoride was not attached to the graphite powder in advance, the dimensional changes tended to shrink more than in the inventive examples.
これは第２表のｆｒｅｅ Ｃの差による鉄粉と黒鉛粉と
の合金化の違いによるものと思われる。This seems to be due to the difference in alloying between iron powder and graphite powder due to the difference in free C shown in Table 2.
第５図から、焼結鋼中に均一に弗化物が分散していない
比較例は本発明例よりも引張強さ、伸びが低下するのが
わかる。From FIG. 5, it can be seen that the comparative example in which fluoride is not uniformly dispersed in the sintered steel has lower tensile strength and elongation than the inventive example.
第６図から比較例が本発明例よりも主分力、横逃げ面摩
耗量が大きいのがわかる。これも第２表のｆｒｅｅ Ｃ
量の違いによる工具潤滑性の違い、および弗化物が均一
分散していないための両方の理由によるものと思われる
０以上から添加する黒鉛粉には弗化物の一部または全量
をＩす着させてから混合するのが必要な条件であること
がわかる。From FIG. 6, it can be seen that the comparative example has a larger principal force and side flank wear amount than the inventive example. This is also free C in Table 2.
This is thought to be due to both the difference in tool lubricity due to the difference in the amount and the fact that the fluoride is not uniformly dispersed.For graphite powder added from 0 or more, some or all of the fluoride is added to it. It can be seen that the necessary condition is to mix the mixture after mixing.
〈発明の効果〉
本発明によると、寸法変化および機械的強度低下を最小
限に抑えて、切削性のよい焼結鋼を容易に製造すること
ができ、この発明は、焼結鋼の利用分野拡大に大いに寄
与する。<Effects of the Invention> According to the present invention, sintered steel with good machinability can be easily produced while minimizing dimensional changes and decreases in mechanical strength. It will greatly contribute to expansion.
第１図は、実施例１におけるＣａＦ２Ｎと抗折力用試験
片の長さ方向の寸法変化との関係を示す特性図、第２図
は、実施例１におけるＣａＦ８Ｉと引張強さ、伸びとの
関係を示す特性図、第３図は、実施例１におけるＣａＦ
ｔ量と切削抵抗の主分力、切削工具の横逃げ面摩耗量と
の関係を示す特性図、第４図は、実施例２における添加
物と抗折力用試験片の長さ方向の寸法変化との関係を示
す特性図、第５図は、実施例２における添加物と引張強
さ、伸びとの関係を示す特性図、第６図は、実施例２に
おける添加物と主分力、
横逃げ面摩耗量との関係を示す特性図である。
特許出願人 川崎製鉄株式会社
第 １ 図
０ １．０ ２０
ＣａＦ２Ｍ 加量（％）
第２図
（ａＦ２添加量（−）
第 ３ 図
ＣａＦ２添加量（チ）
第 ４ 図
Ｍ９Ｆ２ ＢａＦ２ＳｒＦ２
第 ５ 図Figure 1 is a characteristic diagram showing the relationship between CaF2N in Example 1 and dimensional change in the longitudinal direction of the transverse rupture strength test piece, and Figure 2 is a characteristic diagram showing the relationship between CaF8I, tensile strength, and elongation in Example 1. A characteristic diagram showing the relationship, FIG. 3, shows the CaF in Example 1.
A characteristic diagram showing the relationship between the amount of t, the principal component of the cutting resistance, and the amount of side flank wear of the cutting tool. Figure 4 shows the longitudinal dimensions of the additive and transverse rupture force test piece in Example 2. FIG. 5 is a characteristic diagram showing the relationship between additives and tensile strength and elongation in Example 2. FIG. 6 is a characteristic diagram showing the relationship between additives and principal component force in Example 2. FIG. 3 is a characteristic diagram showing the relationship with side flank wear amount. Patent applicant Kawasaki Steel Corporation No. 1 Figure 0 1.0 20 CaF2M addition (%) Figure 2 (aF2 addition amount (-)) Figure 3 CaF2 addition amount (h) Figure 4 M9F2 BaF2SrF2 Figure 5
Claims (1)
カリ土類弗化物の一部または全量を表面に付着させた黒
鉛粉を、前記原料鉄粉に添加、混合して焼結することを
特徴とする切削性に優れた焼結鋼。Add graphite powder to the surface of which a part or all of an alkaline earth fluoride equivalent to 0.1 to 1.2% by weight of the raw iron powder is attached, mix and sinter. Sintered steel with excellent machinability.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28070086A JPS63137137A (en) | 1986-11-27 | 1986-11-27 | Sintered steel excellent in machinability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28070086A JPS63137137A (en) | 1986-11-27 | 1986-11-27 | Sintered steel excellent in machinability |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63137137A true JPS63137137A (en) | 1988-06-09 |
Family
ID=17628730
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28070086A Pending JPS63137137A (en) | 1986-11-27 | 1986-11-27 | Sintered steel excellent in machinability |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63137137A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2669142A1 (en) * | 1990-11-08 | 1992-05-15 | Doryokuro Kakunenryo | Heat-resistant radiological protection material |
| US5545247A (en) * | 1992-05-27 | 1996-08-13 | H ogan as AB | Particulate CaF2 and BaF2 agent for improving the machinability of sintered iron-based powder |
| EP1258537A3 (en) * | 2001-05-17 | 2005-08-03 | JFE Steel Corporation | Iron-based mixed powder for powder metallurgy and iron-based sintered compact |
| JP2012052167A (en) * | 2010-08-31 | 2012-03-15 | Toyota Motor Corp | Iron-based mixed powder for sintering and iron-based sintered alloy |
-
1986
- 1986-11-27 JP JP28070086A patent/JPS63137137A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2669142A1 (en) * | 1990-11-08 | 1992-05-15 | Doryokuro Kakunenryo | Heat-resistant radiological protection material |
| US5545247A (en) * | 1992-05-27 | 1996-08-13 | H ogan as AB | Particulate CaF2 and BaF2 agent for improving the machinability of sintered iron-based powder |
| EP1258537A3 (en) * | 2001-05-17 | 2005-08-03 | JFE Steel Corporation | Iron-based mixed powder for powder metallurgy and iron-based sintered compact |
| CN100347324C (en) * | 2001-05-17 | 2007-11-07 | 杰富意钢铁株式会社 | Iron-based mixed powder for powder metallurgy, and iron-based sintering brequette |
| JP2012052167A (en) * | 2010-08-31 | 2012-03-15 | Toyota Motor Corp | Iron-based mixed powder for sintering and iron-based sintered alloy |
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