JPS62250125A - Brake parts and their manufacture - Google Patents
Brake parts and their manufactureInfo
- Publication number
- JPS62250125A JPS62250125A JP9369186A JP9369186A JPS62250125A JP S62250125 A JPS62250125 A JP S62250125A JP 9369186 A JP9369186 A JP 9369186A JP 9369186 A JP9369186 A JP 9369186A JP S62250125 A JPS62250125 A JP S62250125A
- Authority
- JP
- Japan
- Prior art keywords
- hub
- cast iron
- molten metal
- flake graphite
- brake parts
- 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
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000002184 metal Substances 0.000 claims abstract description 20
- 229910052751 metal Inorganic materials 0.000 claims abstract description 20
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 16
- 239000010439 graphite Substances 0.000 claims abstract description 16
- 229910001018 Cast iron Inorganic materials 0.000 claims abstract description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000000203 mixture Substances 0.000 claims abstract description 12
- 238000013016 damping Methods 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims description 8
- 229910001567 cementite Inorganic materials 0.000 claims description 4
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 claims description 4
- 239000004576 sand Substances 0.000 claims description 4
- 230000005496 eutectics Effects 0.000 claims description 3
- 229910001566 austenite Inorganic materials 0.000 claims description 2
- 238000007528 sand casting Methods 0.000 abstract 2
- 235000019589 hardness Nutrition 0.000 description 11
- 239000000463 material Substances 0.000 description 7
- 238000005266 casting Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 229910001141 Ductile iron Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
- F16D65/0006—Noise or vibration control
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、自動車用のハブドラム、ハブロータなどのブ
レーキ部品とその製造法に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to brake parts such as hub drums and hub rotors for automobiles, and a manufacturing method thereof.
ブレーキ部品としてはハブドラム及びハブロータの２種
類が一般に用いられている。第１，２図に示すようにハ
ブドラム１及びハブロータ２はいずれもボルト３によっ
てホイール４に固着して使用されるもので、ハブ部５は
強度と靭性が要求されるためＦＣＤ５０程度の球状黒鉛
鋳鉄が用いられ、ドラム部６、及びロータ部７は熱伝尋
性、減衰能など、いわゆるブレーキ性能の優れたＦＣ２
５程度の片状黒鉛鋳鉄が用いられている。Two types of brake parts are generally used: hub drums and hub rotors. As shown in Figures 1 and 2, both the hub drum 1 and the hub rotor 2 are used by being fixed to the wheel 4 with bolts 3, and the hub part 5 is made of spheroidal graphite cast iron with a FCD of about 50 because strength and toughness are required. The drum part 6 and rotor part 7 are made of FC2, which has excellent braking performance such as thermal conductivity and damping ability.
5 flake graphite cast iron is used.
このように１球状黒鉛組織のハブ部５と片状黒鉛組織の
ドラム部６、あるいはロータ部７にそれぞれ化学成分の
異る溶湯を注入して成形し使用されている。In this way, the hub portion 5 having a spherical graphite structure, the drum portion 6 having a flaky graphite structure, or the rotor portion 7 are each injected with molten metals having different chemical compositions, and then molded and used.
ところが近年、更にブレーキ性能の優れたドラム部及び
ロータ部の要求が高まり、特に制動時に発する、いわゆ
るブレーキの「鳴き」現象の防止が強く望まれている。However, in recent years, there has been an increasing demand for drum sections and rotor sections with even better braking performance, and in particular, there is a strong desire to prevent the so-called brake "squeal" phenomenon that occurs during braking.
この「鳴き」の発生の確率と、部材を構成する材料の減
衰能特性の間には密接な関係がある。There is a close relationship between the probability of occurrence of this "squeal" and the damping capacity characteristics of the material that constitutes the member.
すなわち、第１表に示すように部材より切り出したテス
トピースのＱ−１値が１６Ｘ１０−’以上で「鳴き」の
発生は防止できる。That is, as shown in Table 1, if the Q-1 value of the test piece cut out from the member is 16X10-' or more, the occurrence of "squeal" can be prevented.
第１表
次にＱ−”値と、材料の化学組成の一つである炭素当量
Ｃ−Ｅ＝Ｃ（％）＋ １／３ Ｓｉ（％）の間にも直線
関係が存在する。Table 1 Next, there is also a linear relationship between the Q-'' value and the carbon equivalent C-E=C (%) + 1/3 Si (%), which is one of the chemical compositions of the material.
すなわち、第３図に示すように材料の炭素当量が４．３
以上でほぼＱ−’値の１６Ｘ１０−’以上を満足する。That is, as shown in Figure 3, the carbon equivalent of the material is 4.3.
The above substantially satisfies the Q-' value of 16×10-' or more.
なお、鋳鉄材の減衰特性を支配する大きな要素は黒鉛の
形状と斌である。形状においては片状黒鉛が最も減衰能
を向上させ、量においては黒鉛の組織中に占める面積率
が約１５％以上でＱ−”値〉１６ＸＩＯ−’を満足する
様になる。この黒鉛面積率〉１５％はＣ−Ｅ値を共晶点
以上にすることによって満足されるため、本明細書では
、工業的に制御し易いＣ−Ｅ値をもって表示することと
した。The major factors governing the damping characteristics of cast iron materials are the shape and shape of the graphite. In terms of shape, flaky graphite improves the attenuation ability the most, and in terms of quantity, when the area ratio of graphite in the structure is about 15% or more, it satisfies the Q-" value of 16XIO-'. This graphite area ratio >15% can be satisfied by making the C-E value equal to or higher than the eutectic point, and therefore, in this specification, it is expressed by the C-E value, which is easy to control industrially.
本発明の目的は、単一化学組成の溶湯を鋳型に注入して
、摺動源付近は「鳴き」を防止するに充分な材質とし、
しかもハブ部は使用中に塑性変形及び損耗することのな
い材質としたブレーキ部品とその製造法を提供するもの
である。The purpose of the present invention is to inject molten metal with a single chemical composition into a mold, and make the material near the sliding source sufficient to prevent "squeal".
Furthermore, the present invention provides a brake component in which the hub portion is made of a material that will not undergo plastic deformation or wear during use, and a method for manufacturing the brake component.
本発明者は、上述せる欠点に鑑み、摺動源付近のブレー
キ性能の向上、およびハブ部付近の機械的性質の改善に
ついて１種々研究を重ねた結果、自動車用ブレーキに用
いる部品として最も好適なブレーキ部品とその製造法を
開発するに到ったものである。In view of the above-mentioned drawbacks, the inventor of the present invention has conducted various studies on improving the braking performance near the sliding source and improving the mechanical properties near the hub, and has found the most suitable parts for use in automobile brakes. This led to the development of brake parts and their manufacturing method.
すなわち、本発明のブレーキ部品は、摺動部とハブ部を
有し単一溶湯による鋳造製一体構造のブレーキ部品であ
って、上記摺動源付近を高減衰能を有する片状黒鉛組織
となし、上記ハブ部付近を高強度鋳鉄組織となすことを
特徴とするものであり、さらに本発明のブレーキ部品の
製造法は、砂型鋳型内のハブ部付近に冷し金を埋設し、
過共晶片状黒鉛鋳鉄組成を有する溶湯を注入することを
特徴とするものである。That is, the brake component of the present invention is a brake component having a sliding part and a hub part and having an integral structure made by casting from a single molten metal, and in which the vicinity of the sliding source is made of flake graphite structure having high damping ability. , the vicinity of the hub portion is characterized by a high-strength cast iron structure, and the method for manufacturing a brake component of the present invention further includes embedding a cold metal in the vicinity of the hub portion in a sand mold,
It is characterized by injecting molten metal having a hypereutectic flake graphite cast iron composition.
さらに他の発明であるブレーキ部品の製造法は。Yet another invention is a method for manufacturing brake parts.
砂型鋳型内のハブ部付近に冷し金を埋設し、過共晶片状
黒鉛鋳鉄組成を有する溶湯を注入して得た鋳造品を共晶
セメンタイトが分解する温度以上の温度に加熱保持し、
然る後、基地組織がオーステナイトである温度範囲より
放冷することを特徴とするものである。A cold metal is buried near the hub in a sand mold, and a cast product obtained by injecting molten metal having a composition of hypereutectic flake graphite cast iron is heated and maintained at a temperature higher than the temperature at which eutectic cementite decomposes,
After that, it is characterized in that it is allowed to cool from a temperature range in which the base structure is austenite.
以下本発明の実施例を図面に基いてさらに詳細に説明す
る。Embodiments of the present invention will be described in more detail below with reference to the drawings.
〔実施例、１〕
（１）１８造方案
第４，５図はともに鋳型の断面図であり、第４図はハブ
ドラムの鋳造方案、第５図はハブロータの鋳造方案を示
すものである。[Example 1] (1) 18 manufacturing method Figures 4 and 5 are both sectional views of the mold, and Figure 4 shows a method for casting a hub drum, and Figure 5 shows a method for casting a hub rotor.
第４図の８，９は黒鉛系塗型を施した鋳鉄製リング状冷
し金で、厚さは相対するハブ部の肉厚と同じ１７ｍｍで
あり、第５図の１０．１１は上記と。8 and 9 in Fig. 4 are cast iron ring-shaped chillers coated with graphite, and the thickness is 17 mm, which is the same as the wall thickness of the opposing hub part, and 10 and 11 in Fig. 5 are the same as above. .
同様の処理を施した冷し金で、厚さはハブ部の肉厚と同
じ１３ａＩＩ１１である。It is a cold metal that has undergone similar treatment, and its thickness is 13aII11, which is the same as the thickness of the hub part.
（２）！８型 鋳型はＣＯ２鋳型を使用した。(2)! Type 8 mold used a CO2 mold.
（３）化学成分
鉄と不可避的不純物と第２表の成分とからなる（４）溶
湯処理
注湯直前にＣ，ａ−Ｓ ＬをＳＬ当量で０．３％接種し
た。(3) Chemical composition consisting of iron, unavoidable impurities, and the components shown in Table 2. (4) Molten metal treatment Immediately before pouring, 0.3% C, a-SL equivalent to SL was inoculated.
（５）！２）造
上記溶湯を第４，５図の鋳型に注湯しハブドラムとハブ
ロータを製作した。(5)! 2) The above molten metal was poured into the molds shown in Figures 4 and 5 to manufacture a hub drum and hub rotor.
（６）硬度
ハブドラム及びハブロータの鋳放し硬度を第３表に示す
。 第３表 （ＨＢ）（７）組織
第６図にハブロータのハブ部付近の鋳放し状態の顕微鏡
組織を、第７図にハブロータの潜動部付近の鋳放し状態
の顕微鏡組織を示す。尚、ハブドラムの各部の組織もハ
ブロータと殆ど同様であった。(6) Hardness Table 3 shows the as-cast hardness of the hub drum and hub rotor. Table 3 (HB) (7) Structure FIG. 6 shows the microscopic structure of the as-cast state near the hub portion of the hub rotor, and FIG. 7 shows the microscopic structure of the as-cast state near the sliding portion of the hub rotor. The structure of each part of the hub drum was almost the same as that of the hub rotor.
（８）結果
第３表より明らかなように、ハブ部付近の硬度はＦＣ２
５相当の硬度を示し、この値は従来からの経験により使
用中に塑性変形及び損耗を生じることはない。一方摺動
部付近は良好な減衰能を有する過共晶片状黒鉛！５鉄に
相当する低い硬度を示している。(8) As is clear from Table 3, the hardness near the hub is FC2
It shows a hardness equivalent to 5, and this value does not cause plastic deformation or wear during use, based on conventional experience. On the other hand, the area near the sliding part is hypereutectic flake graphite with good damping ability! It shows a low hardness equivalent to 5 iron.
第６図の組織は冷し金により急冷されて機密化し、硬度
と整合するＦＣ２５相当の組織を示している。さらに第
７図は充分に成長した過共晶片状点’Ｘｆ鋳鉄組織が認
、ぬられる。The structure shown in FIG. 6 is quenched with a chiller and becomes classified, and shows a structure corresponding to FC25, which matches the hardness. Furthermore, in FIG. 7, a fully grown hypereutectic schistose 'Xf cast iron structure is recognized and painted.
〔実施例、２〕
実施例、Ｙで明らかなようにハブドラムとハブロータは
いずれも殆ど同一の結果を得ることができたので本実施
例では、ハブロータの製造法についてのみ記述する。[Example 2] As is clear from Example Y, almost the same results were obtained with both the hub drum and the hub rotor, so in this example, only the method for manufacturing the hub rotor will be described.
（＋）鋳造方案
実施例、１と同様であるが、冷し金の厚さを実施例６１
の３倍すなわち３９關とした。(+) Casting method Example, same as 1, but the thickness of the chilled metal was changed to Example 61
The number was set to three times that of the previous year, or 39 angles.
（２）鋳型 鋳型はＣ○２訪型を使用した。(2) Mold A C○2 mold was used as the mold.
（３）化学成分
鉄と不可避的不純物と第４表の成分とからなる（４）鋳
造
上記溶湯を第５図の鋳型に注入しハブロータを製作した
。(3) Chemical composition consisting of iron, unavoidable impurities, and the components shown in Table 4. (4) Casting The above molten metal was poured into the mold shown in FIG. 5 to produce a hub rotor.
（５）ｕ放し状態の組織
第８図にハブロータのハブ部付近の全屈顕微鏡組織を示
す。(5) Structure in u-released state Figure 8 shows the structure under a full bending microscope near the hub portion of the hub rotor.
（６）熱処理
ハブロータを９２０℃に加熱し３時間保持した後、８２
０℃まで炉冷し１時間保持した後放冷した。(6) Heat treatment After heating the hub rotor to 920°C and holding it for 3 hours,
The mixture was cooled in a furnace to 0°C, maintained for 1 hour, and then allowed to cool.
（７）硬度 熱処理後のハブロータの硬度を第５表に示す。(7) Hardness Table 5 shows the hardness of the hub rotor after heat treatment.
第５表 （ＩＩ Ｂ ）
（８）組織
第９図にハブロータの熱処理後のハブ部付近の顕微鏡組
織を、第１０図に同じく摺動品付近の顕微鏡組織を示す
。Table 5 (II B) (8) Structure FIG. 9 shows the microscopic structure near the hub portion of the hub rotor after heat treatment, and FIG. 10 shows the microscopic structure near the sliding product.
（９）結果
冷し金を厚くした場合、第１０図に示すようにセメンタ
イトが晶出する。従ってこのまま使用するとハブ部付近
より欠損する恐れがある。(9) As a result, when the thickness of the cooled metal is increased, cementite crystallizes as shown in FIG. Therefore, if you use it as is, there is a risk that it will break off near the hub.
これに対し前述の熱処理を施すとハブ部付近はセメンタ
イトが分解して塊状の黒鉛組織になると同時に硬度もＩ
Ｉ Ｂ ２３５となり実施例、１と比較して更に塑性変
形及び損耗に対して抵抗性を増大した材質となる。On the other hand, when the heat treatment described above is applied, the cementite near the hub part decomposes into a lumpy graphite structure, and at the same time the hardness decreases to I.
IB 235, which is a material with increased resistance to plastic deformation and wear compared to Example 1.
一方摺動部付近の片状黒鉛の形態および量は変化がなく
、硬度もＩＩ Ｂ １４３と高減衰能を満足する過共品
片状思鉛鋳軟組織となっている。On the other hand, there is no change in the form or amount of graphite flakes near the sliding part, and the hardness is II B 143, which is a super-composite graphite flake cast soft structure that satisfies high damping performance.
尚、これらの硬度は、放冷する温度の設定および放冷時
の冷却条件を適宜設定することにより。These hardnesses can be determined by appropriately setting the cooling temperature and the cooling conditions during cooling.
所望の値に調整することができる。It can be adjusted to the desired value.
以上の説明で明らかなように本発明により製造されたハ
ブドラム、ハブロータなどのブレーキ部品は摺動品付近
は高減衰能を有する片状黒鉛組織で良好なブレーキ性能
を備え、ハブ部付近は機械的性質の優れた高強度鋳鉄組
織を有するものである。As is clear from the above explanation, brake parts such as hub drums and hub rotors manufactured according to the present invention have good braking performance due to the flaky graphite structure with high damping ability near the sliding parts, and mechanical It has a high strength cast iron structure with excellent properties.
また、このような両特性を備えたブレーキ部品をｊｌｊ
、−の７８湯によって製作し得た本発明は製造原価の低
減、耐用寿命の増大、安全性の向上等工業的に極めて優
れた多くの効果を有するものである。In addition, brake parts with both of these characteristics are
The present invention, which can be manufactured using 78 hot water of -, has many industrially excellent effects such as reduction in manufacturing cost, increase in service life, and improvement in safety.
第１図はハブドラムの断面図、第２図はハブロータの断
面図、第３図は減衰能とＣ−Ｅ値の関係図、第４，５図
はともに鋳型の断面図、第６〜１０図は金属顕微鏡組織
写真である。
１：ハブドラム ２：ハブロータ ５：ハブ部６：ドラ
ム部 ７：ロータ部
第１図 ｂｓ２図
第４図
第３図Figure 1 is a sectional view of the hub drum, Figure 2 is a sectional view of the hub rotor, Figure 3 is a diagram of the relationship between damping capacity and C-E value, Figures 4 and 5 are both sectional views of the mold, and Figures 6 to 10. is a photo of the metallurgical microstructure. 1: Hub drum 2: Hub rotor 5: Hub part 6: Drum part 7: Rotor part Fig. 1 BS2 Fig. 4 Fig. 3
Claims (1)
造のブレーキ部品であって、上記摺動部付近を高減衰能
を有する片状黒鉛組織となし、上記ハブ部付近を高強度
鋳鉄組織となすことを特徴とするブレーキ部品。 ２、砂型鋳型内のハブ部付近に冷し金を埋設し、過共晶
片状黒鉛鋳鉄組成を有する溶湯を注入することを特徴と
するブレーキ部品の製造法。 ３、砂型鋳型内のハブ部付近に冷し金を埋設し、過共晶
片状黒鉛鋳鉄組成を有する溶湯を注入して得た鋳造品を
共晶セメンタイトが分解する温度以上の温度に加熱保持
し、然る後、基地組織がオーステナイトである温度範囲
より放冷することを特徴とするブレーキ部品の製造法。[Scope of Claims] 1. A brake component having a sliding part and a hub part and having an integral structure made of a single molten metal, the vicinity of the sliding part being made of flake graphite structure having high damping ability, A brake component characterized in that the vicinity of the hub portion has a high-strength cast iron structure. 2. A method for manufacturing brake parts, which comprises embedding cold metal near the hub in a sand mold and injecting molten metal having a composition of hypereutectic flake graphite cast iron. 3. A cold metal is buried near the hub in the sand mold, and the cast product obtained by injecting molten metal having a composition of hypereutectic flake graphite cast iron is heated and maintained at a temperature higher than the temperature at which eutectic cementite decomposes. A method for producing brake parts, which is then allowed to cool from a temperature range in which the base structure is austenite.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9369186A JPS62250125A (en) | 1986-04-23 | 1986-04-23 | Brake parts and their manufacture |
| US07/026,750 US4807728A (en) | 1986-03-20 | 1987-03-17 | Brake member and method of manufacturing same |
| DE19873709062 DE3709062A1 (en) | 1986-03-20 | 1987-03-19 | BRAKE ELEMENT FOR MOTOR VEHICLE BRAKES AND METHOD FOR THE PRODUCTION THEREOF |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9369186A JPS62250125A (en) | 1986-04-23 | 1986-04-23 | Brake parts and their manufacture |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62250125A true JPS62250125A (en) | 1987-10-31 |
Family
ID=14089428
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9369186A Pending JPS62250125A (en) | 1986-03-20 | 1986-04-23 | Brake parts and their manufacture |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62250125A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1658913A1 (en) * | 2004-11-19 | 2006-05-24 | Siemens Aktiengesellschaft | Casting method and casting article |
-
1986
- 1986-04-23 JP JP9369186A patent/JPS62250125A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1658913A1 (en) * | 2004-11-19 | 2006-05-24 | Siemens Aktiengesellschaft | Casting method and casting article |
| WO2006053838A3 (en) * | 2004-11-19 | 2006-11-09 | Siemens Ag | Casting method and cast component |
| KR100929451B1 (en) | 2004-11-19 | 2009-12-02 | 지멘스 악티엔게젤샤프트 | Casting method and casting parts |
| US7681623B2 (en) | 2004-11-19 | 2010-03-23 | Siemens Aktiengesellschaft | Casting process and cast component |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4807728A (en) | Brake member and method of manufacturing same | |
| JP5669392B2 (en) | Steel material with high silicon content for the production of piston rings and cylinder liners | |
| CA1229777A (en) | Method of making cg iron | |
| JP2001520313A (en) | Molybdenum-containing iron alloy | |
| JP2007197747A (en) | Cast iron containing spheroidal graphite | |
| JPS62250125A (en) | Brake parts and their manufacture | |
| US3673004A (en) | Method of making piston rings | |
| JPH02138527A (en) | Hub rotor | |
| JPS62222026A (en) | Manufacture of brake part | |
| WO2000075387A1 (en) | Non-austempered spheroidal graphite cast iron | |
| JPH07216495A (en) | Brake parts excellent in heat check resistance and its production | |
| US3518128A (en) | Process for manufacturing high-strength,wear-resistant piston rings | |
| CN112921233A (en) | Synthetic cast iron cylinder sleeve and preparation method thereof | |
| JPH04175524A (en) | Brake disc member | |
| US2105220A (en) | Ferrous metal | |
| JPS6029420A (en) | Manufacture of composite cylinder liner having high strength and toughness | |
| CN104878285A (en) | High-strength wear-resisting casting material for hydraulic wrench piston and preparation method thereof | |
| US2192645A (en) | Ferrous metal | |
| JPS5867844A (en) | Spherical graphite cast iron excellent in tenacity and preparation thereof | |
| JPH0115576B2 (en) | ||
| JPH06246415A (en) | Centrifugal casting of tough ductile cast iron tube | |
| JPH02138437A (en) | Hub drum | |
| JP2659352B2 (en) | Manufacturing method of Bamikiura graphite cast iron | |
| JPH01107957A (en) | Casting and casting method thereof | |
| JP2676456B2 (en) | Brake disc material manufacturing method |