JPS63259018A - Production of spheroidal graphite cast iron casting - Google Patents
Production of spheroidal graphite cast iron castingInfo
- Publication number
- JPS63259018A JPS63259018A JP9591887A JP9591887A JPS63259018A JP S63259018 A JPS63259018 A JP S63259018A JP 9591887 A JP9591887 A JP 9591887A JP 9591887 A JP9591887 A JP 9591887A JP S63259018 A JPS63259018 A JP S63259018A
- Authority
- JP
- Japan
- Prior art keywords
- casting
- treatment
- graphite
- spheroidal graphite
- cast iron
- 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.)
- Granted
Links
- 238000005266 casting Methods 0.000 title claims abstract description 33
- 229910001141 Ductile iron Inorganic materials 0.000 title claims abstract description 16
- 238000004519 manufacturing process Methods 0.000 title claims description 10
- 238000000034 method Methods 0.000 claims abstract description 47
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 24
- 239000010439 graphite Substances 0.000 claims abstract description 24
- 230000009466 transformation Effects 0.000 claims abstract description 22
- 239000002054 inoculum Substances 0.000 claims abstract description 17
- 238000003754 machining Methods 0.000 claims abstract description 9
- 238000011081 inoculation Methods 0.000 claims description 38
- 238000010438 heat treatment Methods 0.000 claims description 19
- 238000001816 cooling Methods 0.000 claims description 3
- 238000001556 precipitation Methods 0.000 abstract description 10
- 239000011159 matrix material Substances 0.000 abstract description 4
- 239000002245 particle Substances 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 229910000859 α-Fe Inorganic materials 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 238000000137 annealing Methods 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 5
- 230000007423 decrease Effects 0.000 description 5
- 230000006866 deterioration Effects 0.000 description 5
- 238000005279 austempering Methods 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 4
- 239000002244 precipitate Substances 0.000 description 4
- 229910001566 austenite Inorganic materials 0.000 description 3
- 238000000354 decomposition reaction Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000000717 retained effect Effects 0.000 description 3
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- 238000005275 alloying Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910001562 pearlite Inorganic materials 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002411 adverse 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
- 229910001563 bainite Inorganic materials 0.000 description 1
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000010730 cutting oil Substances 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000005087 graphitization Methods 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Landscapes
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、球状黒鉛鋳鉄鋳物の製造方法、より詳しく言
えば、オーステンパー処理を行なう球状黒鉛鋳鉄鋳物に
ついて、オーステンパー処理前に機械加工を行なう場合
の球状黒鉛鋳鉄鋳物の製造方法に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method for manufacturing spheroidal graphite iron castings, more specifically, a method for manufacturing spheroidal graphite iron castings to be subjected to austempering treatment. The present invention relates to a method for producing spheroidal graphite iron castings.
し従来の技術］
球状黒鉛鋳鉄鋳物において、鋳物に、オーステナイト化
処理を施し次に恒温変態処理を施す、所謂オーステンパ
ー処理を行ない、その基地をベイナイトと残留オーステ
ナイトとの混在組織とすることによって、フェライト系
あるいはフェライト−パーライト系のものに比べて、高
強度、高靭性の球状黒鉛鋳鉄鋳物が得られることは従来
より良く知られている。[Prior art] In spheroidal graphite cast iron castings, the casting is subjected to austenitization treatment and then isothermal transformation treatment, so-called austempering treatment, and the base is made into a mixed structure of bainite and retained austenite. It has been well known that spheroidal graphite cast iron castings with higher strength and toughness can be obtained than those of ferrite type or ferrite-pearlite type.
しかしながら、この場合には、上記オーステンパー処理
によって塊状の残留オーステナイトが析出し、この残留
オーステナイトが加工時に加工誘起変態を起こしてマル
テンサイトになるため、被削性が著しく悪化するという
問題がある。However, in this case, the austempering process precipitates lumpy retained austenite, and this retained austenite undergoes deformation-induced transformation during machining to become martensite, resulting in a significant deterioration in machinability.
この被削性の問題を回避するために、オーステンパー処
理面に機械加工することが行なわれているが、この場合
でも鋳放し状態での素材硬度が高いため、−次熱処理と
して、歪取りを兼ねた軟化焼鈍を施し、その後に機械加
工を行なうことにしている。In order to avoid this machinability problem, machining is carried out on the austempered surface, but even in this case, since the material is hard in the as-cast state, strain relief is performed as a secondary heat treatment. We will perform a softening annealing process, which also serves as a softening annealing process, and then perform machining.
ところで、球状黒鉛鋳鉄鋳物を製造する場合、一般に、
チル化防止、黒鉛化の促進などを目的として接種が行な
われている。従来では、この接種は、一般に、溶湯を取
鍋から鋳型に注湯する訂に取鍋内で接種剤を添加する取
鍋接種法によって行なわれているが、この方法では、接
種を行なってから凝固するまでに時間がかかるため、接
種効果が低減し、被削性と靭性に著しい悪影響を及ぼす
チルが析出する恐れがある。また、上記チルが析出する
と一般に黒鉛粒数が少なくなるので、合金元素の偏析、
硬度の高い炭化物の析出等を生じ、この点においても被
削性が阻害される。By the way, when manufacturing spheroidal graphite iron castings, generally,
Inoculation is performed for the purpose of preventing chilling and promoting graphitization. Conventionally, this inoculation has generally been carried out by the ladle inoculation method, in which the inoculant is added in the ladle while the molten metal is poured from the ladle into the mold. Since it takes time to solidify, the inoculation effect is reduced and there is a risk that chill will precipitate, which will have a significant adverse effect on machinability and toughness. In addition, when the above-mentioned chill precipitates, the number of graphite particles generally decreases, so segregation of alloying elements,
Precipitation of carbides with high hardness occurs, and machinability is also inhibited in this respect.
［発明か解決しようとする問題点］
このチル析出による被削性悪化の対策として、鋳造後、
機械加工前に行なわれる一次熱処理において、焼鈍処理
に先立って鋳物をＡ１変態点以上の所定温度で所定時間
加熱保持してデル分解を行ない、次いでＡ１変態点以下
の所定温度で所定時間加熱保持して焼鈍を行なう、所謂
二段焼鈍を行なうことが提案されている。しかし、この
方法では、熱処理コストが高くなり、また時間が長くか
かるという問題がある。[Problems to be solved by the invention] As a countermeasure to the deterioration of machinability due to chill precipitation, after casting,
In the primary heat treatment performed before machining, prior to annealing treatment, the casting is heated and held at a predetermined temperature above the A1 transformation point for a predetermined time to perform del decomposition, and then heated and held at a predetermined temperature below the A1 transformation point for a predetermined time. It has been proposed to perform so-called two-stage annealing. However, this method has problems in that the heat treatment cost is high and it takes a long time.
ところで、鋳造時における接種剤の添加を、鋳型に溶湯
を注ぐ際に行なう注湯流接種法または、鋳型内の湯道の
途中部にヂャンバを設け、このチャンバ内に接種剤を充
填することによって添加するインモールド接種法で行な
えば、接種を行なってから凝固するまでの時間が短くな
り、このため接種効果が向上し、黒鉛粒数が増加してチ
ル析出の抑制を期待することができる。By the way, the inoculant can be added during casting by the pouring inoculation method, which is carried out when pouring the molten metal into the mold, or by providing a chamber in the middle of the runner in the mold and filling this chamber with the inoculant. If the in-mold inoculation method is used, the time from inoculation to solidification will be shortened, thereby improving the inoculation effect, increasing the number of graphite particles, and suppressing chill precipitation.
［発明の目的コ
本発明は、上記問題点に鑑みてなされたもので、球状黒
鉛鋳鉄鋳物の製造方法において、鋳造時の接種方法を工
夫することにより黒鉛位数を増加させ、鋳放し状態での
被削性を向上させるとともに、−次熱処理を行なう場合
でも、その熱処理コストを低減することができる製造方
法を提供することを目的とする。[Purpose of the Invention] The present invention has been made in view of the above-mentioned problems, and in a method for manufacturing spheroidal graphite cast iron castings, the number of graphite is increased by devising the inoculation method during casting, and it is possible to produce a cast iron product in an as-cast state. It is an object of the present invention to provide a manufacturing method that can improve the machinability of the steel and reduce the cost of heat treatment even when performing the second heat treatment.
［問題点を解決するための手段］
このため、本願の第一の発明は、鋳造時に接種剤を注湯
流接種法またはインモールド接種法で添加して黒鉛粒数
が２５０個／ｘｍ”以上の黒鉛を含有する球状黒鉛鋳鉄
鋳物を形成し、次に機械加工を行ない、その後に加熱し
てオーステナイト化処理を施し、次に急冷して恒温変態
処理を施すようにしたものである。[Means for Solving the Problems] Therefore, the first invention of the present application is to add an inoculant during casting by a pouring inoculation method or an in-mold inoculation method so that the number of graphite particles is 250 pieces/xm" or more. A spheroidal graphite cast iron casting containing graphite is formed, then machined, heated to undergo austenitization treatment, and then rapidly cooled to undergo isothermal transformation treatment.
さらに、本願の第二の発明は、鋳造時に接種剤を注湯流
接種法またはインモールド接種法で添加して黒鉛粒数が
２５０個／Ｒｊ１″以上の黒鉛を含有する球状黒鉛鋳鉄
鋳物を形成し、次にＡ、変態点以下の温度で０．５〜８
時間加熱保持し、次に機械加工を行ない、その後に加熱
してオーステナイト化処理を施し、次に急冷゛して恒温
変態処理を施すようにしたものである。Furthermore, the second invention of the present application is to form a spheroidal graphite iron casting containing graphite with a number of graphite grains of 250 pieces/Rj1'' or more by adding an inoculant during casting using a pouring inoculation method or an in-mold inoculation method. Then, A, 0.5 to 8 at a temperature below the transformation point.
It is heated and held for a period of time, then machined, then heated to undergo austenitizing treatment, and then rapidly cooled and subjected to isothermal transformation treatment.
上記接種剤の添加方法を注湯流接種法またはインモール
ド接種法に限定し、且つ黒鉛粒数を２５０個／ｘｘ’以
上に限定した理由を説明する。The reason why the method of adding the inoculant was limited to the pouring inoculation method or the in-mold inoculation method and the number of graphite particles was limited to 250 pieces/xx' or more will be explained.
取鍋接種法で接種剤を添加しても、冷却速度が十分に速
ければ黒鉛粒数を２５０個／ａｘ”以上にすることは可
能であるが、素材全体を２５０個／ＲＲ”以上にするこ
とは困難であり、たとえ可能であってもチル析出による
靭性の低下をまぬがれることはできない。従って、黒鉛
粒数２５０個／ Ｊ！Ｊ！８以工を確保するために、接
種方法を接種効果の高い注湯流法あるいはインモールド
法にすることで、素材全体の黒鉛粒数を２５０個／ｘｚ
’以上にすることができ、チルの析出を生じることなく
フェライト化を促進することができ、被削性を向上させ
、靭性の低下を防止することができる。２５０個／Ｉ１
１以下になると、たとえ注湯流法あるいはインモールド
法であっても、その効果が著しく低下してチルが析出し
、被削性の悪化および靭性の低下を招く恐れがあるから
である。Even if the inoculant is added using the ladle inoculation method, it is possible to increase the number of graphite particles to 250 particles/ax" or more if the cooling rate is fast enough, but it is possible to increase the number of graphite particles to 250 particles/RR" or more for the entire material. Even if it were possible, it would be impossible to avoid a decrease in toughness due to chill precipitation. Therefore, the number of graphite particles is 250/J! J! In order to ensure a 8% reduction, the number of graphite grains in the entire material was reduced to 250 particles/xz by using the pouring method or in-mold method, which has a high inoculation effect, as the inoculation method.
' or more, ferrite formation can be promoted without producing chill precipitation, machinability can be improved, and toughness can be prevented from deteriorating. 250 pieces/I1
If it is less than 1, the effectiveness of the pouring method or in-mold method will be significantly reduced, and chill will precipitate, leading to deterioration of machinability and toughness.
また、鋳造後、機械加工前に一次熱処理を施す場合につ
いて、熱処理温度をＡ、変態点以下、加熱保持時間を０
．５〜８時間に限定したのは以下の理由による。In addition, when performing primary heat treatment after casting and before machining, the heat treatment temperature is A, below the transformation point, and the heating holding time is 0.
．． The reason for limiting the time to 5 to 8 hours is as follows.
温度をＡ１変態点以下としたのは、黒鉛位数を２５０個
７１ｍ”以上確保することにより、チルの析出が防止さ
れるので、チル分解処理が不用であり、Ａ１変態点以上
に加熱する必要がなく、また、Ａ＋変態点以上の熱処理
を繰り返すとヤング率の低下を招くからである。Ａ、変
態点以下の温度としては７００〜７５０°Ｃの温度範囲
が好ましい。The reason why the temperature is set below the A1 transformation point is that by ensuring the graphite number is 250 pieces or more at 71 m'' or more, precipitation of chill is prevented, so chill decomposition treatment is unnecessary, and heating above the A1 transformation point is necessary. This is because repeating the heat treatment above the A+ transformation point leads to a decrease in Young's modulus.A, the temperature below the transformation point is preferably in the range of 700 to 750°C.
加熱保持時間を０．５〜８時間としたのは、０゜５時間
未満ではフェライト化が七分行なわれず、また、８時間
以上ではその効果が飽和してコストが高くなるだけであ
るためである。The reason why the heating and holding time was set to 0.5 to 8 hours is because ferrite formation will not take place for less than 0.5 hours, and if it is longer than 8 hours, the effect will be saturated and the cost will only increase. be.
なお、オーステンパー処理の条件としては、オーステナ
イト化処理が８００〜９５０℃の温度で４時間以下加熱
保持するのが好ましく、恒温変態処理は、２５０〜４２
０℃の温度で１５分以上保持するのが好ましい。As for the conditions of the austempering treatment, it is preferable that the austenitizing treatment is heated and held at a temperature of 800 to 950°C for 4 hours or less, and the isothermal transformation treatment is preferably held at a temperature of 250 to 42°C.
Preferably, the temperature is maintained at 0° C. for 15 minutes or more.
［発明の効果］
本発明によれば、鋳造時に接種剤を注湯流接種法または
インモールド接種法で添加するようにしたので、従来一
般に行なわれていた取鍋接種法に比へて、接種を行なっ
てから溶渇か凝固するまでの時間が短くなり、このため
接種効果が向上して黒鉛粒数を２５０個／ｘｒｘ”以上
に増加させることかできる。その結果、チルの析出を抑
制するとと６に基地組織のフェライト化を促進すること
ができるので、被削性の悪化及び靭性の低下を防止する
ことができる。また、合金元素の偏析を防止することが
できるので、オーステンパー処理後の靭性低下も併せて
防止することができる。[Effects of the Invention] According to the present invention, since the inoculant is added at the time of casting by the pouring inoculation method or the in-mold inoculation method, it is easier to inoculate than the conventional ladle inoculation method. The time from melting to solidification is shortened, which improves the inoculation effect and increases the number of graphite grains to 250 pieces/xrx" or more. As a result, the precipitation of chill is suppressed. and 6, it can promote the formation of ferrite in the base structure, which can prevent deterioration of machinability and toughness.It can also prevent segregation of alloying elements, so it is possible to prevent the deterioration of machinability and toughness. It is also possible to prevent a decrease in toughness.
さらに本願の第二の発明によれば、上記したようにチル
の析出を抑制することができるので、機械加工前に一次
熱処理を行なう場合でも、Ａ１変態点以上に加熱保持す
るチル分解処理を施す必要がなく、Ａ１変態点以下の温
度で０，５〜８時間加熱保持する低温焼鈍のみでよいの
で、熱処理温度の低温化及び熱処理時間の短縮が可能と
なり、エネルギ消費量を低減して製造コストを低減する
ことができるとともに、ＡＩ変態点以上での熱処理を繰
り返すことにより黒鉛のまわりが空洞化するために生じ
るヤング率の低下を防止することができる。Furthermore, according to the second invention of the present application, since the precipitation of chill can be suppressed as described above, even when performing primary heat treatment before machining, it is possible to perform chill decomposition treatment that heats and maintains the A1 transformation point or higher. Since there is no need for low-temperature annealing, which requires heating and holding for 0.5 to 8 hours at a temperature below the A1 transformation point, it is possible to lower the heat treatment temperature and shorten the heat treatment time, reducing energy consumption and reducing manufacturing costs. In addition, it is possible to prevent a decrease in Young's modulus caused by hollowing around graphite by repeating heat treatment at a temperature equal to or higher than the AI transformation point.
［実施例］
以下、本発明の実施例を、従来通りの取鍋接種法を用い
た比較例と比べて説明する。[Example] Examples of the present invention will be described below in comparison with a comparative example using a conventional ladle inoculation method.
（１）接種方法
本発明実施例として４本の供試材、及び比較例として２
本の供試材を鋳造した。(1) Inoculation method Four test materials were used as examples of the present invention, and two as comparative examples.
A sample material for a book was cast.
第１表に示したように、本発明実施例１及び２について
は注湯流接種法で、本発明実施例３及び４についてはイ
ンモールド接種法で接種剤の添加を行なった。また比較
例は取鍋接種法によるものである。なお、接種剤として
は、Ｆｅ−５ｉ（５０重１％）系、Ｆｅ−８ｉ（６０〜
７５重量％）系にＣａ。As shown in Table 1, the inoculants were added using the pour-flow inoculation method for Examples 1 and 2 of the present invention, and the in-mold inoculation method for Examples 3 and 4 of the present invention. Moreover, the comparative example is based on the ladle inoculation method. In addition, as an inoculant, Fe-5i (50 weight 1%) system, Fe-8i (60~
75% by weight) in the system.
Ａｒ１、Ｚｒ、 Ｂｉ、希土類元素等を添加したものを
用いることができ、実験に用いたものは、本発明かＦｅ
−５ｉ（６０〜７５重量％）−Ｃａ−ＡＱ系の接種剤を
０．１〜０．２５重量％添加し、一方、比較例は同じ接
種剤を０．３〜０．６重量％添加したものを用いた。Those added with Ar1, Zr, Bi, rare earth elements, etc. can be used, and those used in the experiment are those of the present invention or Fe.
-5i (60 to 75 wt%) -Ca-AQ based inoculant was added in an amount of 0.1 to 0.25 wt%, while in the comparative example, the same inoculant was added in an amount of 0.3 to 0.6 wt%. I used something.
（２）化学組成
本発明実施例１，２，３．４及び比較例１．２の供試材
の化学組成（重量％）は第１表に示す通りであった。(2) Chemical composition The chemical compositions (% by weight) of the test materials of Examples 1, 2, and 3.4 of the present invention and Comparative Example 1.2 were as shown in Table 1.
（３）基地組織及び黒鉛粒数
鋳放し状態の各供試材について、その基地組織中のフェ
ライトとパーライトの容１％、及び単位面積（ｌ ＲＲ
り当りの黒鉛粒数を測定した。(3) Matrix structure and number of graphite grains For each specimen in the as-cast state, the volume of ferrite and pearlite in the matrix structure is 1%, and the unit area (l RR
The number of graphite particles per plate was measured.
測定結果は、第２表に示す通りであり、注湯流接種法ま
たはインモールド接種法を用いた本発明実施例について
は、いずれも黒鉛位数は２５０個／ ｘｘ ２以上であ
り、また比較例に比べて著しくフェライト化が促進され
ていることが確認された。The measurement results are as shown in Table 2, and for the examples of the present invention using the pouring inoculation method or the in-mold inoculation method, the number of graphites was 250 pieces/xx 2 or more in all cases, and the number of graphites was 250 pieces/xx 2 or more, and the comparison It was confirmed that ferrite formation was significantly promoted compared to the example.
本発明の実施例および比較例は、鋳放し状態の鋳物素材
を８９０℃の温度で１．５時間加熱保持してオーステナ
イト化処理を行い、その後３９５°Ｃの温度で２．０時
間加熱保持する恒温変態処理を行ったものである。In the examples and comparative examples of the present invention, as-cast casting materials are heated and held at a temperature of 890°C for 1.5 hours to undergo austenitization treatment, and then heated and held at a temperature of 395°C for 2.0 hours. It was subjected to constant temperature transformation treatment.
（４）被削性試験
上記本発明実施例１，２，３．４及び比較例１．２につ
いて、外径４５肩肩、長さ３５０ｕｙの丸棒試験片をそ
れぞれ作成し、その外径部を切削加工して工具寿命を測
定した。使用工具及び切削条件は以下の通りであった。(4) Machinability test For the above-mentioned Examples 1, 2, and 3.4 of the present invention and Comparative Example 1.2, round bar test pieces with an outer diameter of 45 mm and a length of 350 uy were prepared. The tool life was measured by cutting. The tools used and cutting conditions were as follows.
使用工具：ＡＣＩＯＧ（アルミコーティング）切削条件
切削速度 ：１２０ｍ／分
送り コ０ 、４ ｍｙ／回転
切込み深さ：１．５ａｍ
切削油 ：無給油（ドライ）
上記試験で得られた各試験片に対する工具寿命について
、比較例１に対する工具寿命を基準（１゜０）として、
係数化して表わした試験結果を第２表に示した。Tool used: ACIOG (aluminum coating) Cutting conditions Cutting speed: 120 m/min feed Ko0, 4 my/rotation Depth of cut: 1.5 am Cutting oil: No lubrication (dry) Tools for each test piece obtained in the above test Regarding the tool life, the tool life for Comparative Example 1 is used as the standard (1°0),
The test results expressed as coefficients are shown in Table 2.
第２表から判るように、本発明実施例によれば、比較例
に比べて著しく工具寿命が長くなり、被削性が向上する
ことが確認された。As can be seen from Table 2, it was confirmed that according to the examples of the present invention, the tool life was significantly longer and the machinability was improved compared to the comparative examples.
以上説明したように、本発明実施例によれば、鋳造時に
接種剤を注湯流接種法またはインモールド接種法で添加
するようにしたので、従来一般に行なわれていた取鍋接
種法に比べて、接種を行なってから溶湯が凝固するまで
の時間が短くなり、このため接種効果が向上して黒鉛粒
数を２５０個／ＩＵ”以上に増加させることができる。As explained above, according to the embodiments of the present invention, the inoculant is added at the time of casting by the pouring inoculation method or the in-mold inoculation method, which is more effective than the conventional ladle inoculation method. The time from inoculation to solidification of the molten metal is shortened, so the inoculation effect is improved and the number of graphite particles can be increased to 250 pieces/IU'' or more.
その結果、チルの析出を抑制するとともに基地組織のフ
ェライト化を促進することができるので、鋳放し状態で
の被削性を向上させることができるのである。As a result, the precipitation of chill can be suppressed and the formation of ferrite in the matrix structure can be promoted, so that machinability in the as-cast state can be improved.
Claims (2)
ド接種法で添加して黒鉛粒数が２５０個／ｍｍ＾２以上
の黒鉛を含有する球状黒鉛鋳鉄鋳物を形成し、次に機械
加工を行ない、その後に加熱してオーステナイト化処理
を施し、次に急冷して恒温変態処理を施すことを特徴と
する球状黒鉛鋳鉄鋳物の製造方法。(1) At the time of casting, an inoculant is added by pouring inoculation method or in-mold inoculation method to form a spheroidal graphite cast iron casting containing graphite with a graphite grain number of 250 pieces/mm^2 or more, and then machining. A method for manufacturing spheroidal graphite iron castings, the method comprising: performing austenitizing treatment by heating, and then rapidly cooling and subjecting to isothermal transformation treatment.
ド接種法で添加して黒鉛粒数が２５０個／ｍｍ＾２以上
の黒鉛を含有する球状黒鉛鋳鉄鋳物を形成し、次にＡ＿
１変態点以下の温度で０．５〜８時間加熱保持し、次に
機械加工を行ない、その後に加熱してオーステナイト化
処理を施し、次に急冷して恒温変態処理を施すことを特
徴とする球状黒鉛鋳鉄鋳物の製造方法。(2) Add an inoculant during casting by pouring inoculation method or in-mold inoculation method to form a spheroidal graphite cast iron casting containing graphite with a graphite grain number of 250 pieces/mm^2 or more, and then A_
It is characterized by heating and holding at a temperature below 1 transformation point for 0.5 to 8 hours, then performing machining, then heating to perform austenitization treatment, and then rapidly cooling to perform isothermal transformation treatment. A method for manufacturing spheroidal graphite iron castings.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62095918A JPH0613727B2 (en) | 1987-04-16 | 1987-04-16 | Manufacturing method of spheroidal graphite cast iron casting |
| US07/181,428 US4838956A (en) | 1987-04-16 | 1988-04-14 | Method of producing a spheroidal graphite cast iron |
| DE3812624A DE3812624A1 (en) | 1987-04-16 | 1988-04-15 | BALL GRAPHITE CAST IRON AND METHOD FOR PRODUCING IT |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62095918A JPH0613727B2 (en) | 1987-04-16 | 1987-04-16 | Manufacturing method of spheroidal graphite cast iron casting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63259018A true JPS63259018A (en) | 1988-10-26 |
| JPH0613727B2 JPH0613727B2 (en) | 1994-02-23 |
Family
ID=14150656
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62095918A Expired - Lifetime JPH0613727B2 (en) | 1987-04-16 | 1987-04-16 | Manufacturing method of spheroidal graphite cast iron casting |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0613727B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63259020A (en) * | 1987-04-16 | 1988-10-26 | Mazda Motor Corp | Production of spheroidal graphite cast iron casting |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5931567A (en) * | 1982-08-12 | 1984-02-20 | Japan Storage Battery Co Ltd | Manufacture of liquid circulation type aluminum-silver oxide battery |
| JPS59215247A (en) * | 1983-05-19 | 1984-12-05 | Shinko Electric Co Ltd | Method and device for adding inoculant |
| JPS61182871A (en) * | 1985-02-08 | 1986-08-15 | Takaoka Kogyo Kk | Production of heat resistant austenite spheroidal graphite cast iron |
| JPS63259020A (en) * | 1987-04-16 | 1988-10-26 | Mazda Motor Corp | Production of spheroidal graphite cast iron casting |
-
1987
- 1987-04-16 JP JP62095918A patent/JPH0613727B2/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5931567A (en) * | 1982-08-12 | 1984-02-20 | Japan Storage Battery Co Ltd | Manufacture of liquid circulation type aluminum-silver oxide battery |
| JPS59215247A (en) * | 1983-05-19 | 1984-12-05 | Shinko Electric Co Ltd | Method and device for adding inoculant |
| JPS61182871A (en) * | 1985-02-08 | 1986-08-15 | Takaoka Kogyo Kk | Production of heat resistant austenite spheroidal graphite cast iron |
| JPS63259020A (en) * | 1987-04-16 | 1988-10-26 | Mazda Motor Corp | Production of spheroidal graphite cast iron casting |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63259020A (en) * | 1987-04-16 | 1988-10-26 | Mazda Motor Corp | Production of spheroidal graphite cast iron casting |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0613727B2 (en) | 1994-02-23 |
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