JP3678453B2 - Aluminum-based composite brake rotor - Google Patents
Aluminum-based composite brake rotor Download PDFInfo
- Publication number
- JP3678453B2 JP3678453B2 JP05789195A JP5789195A JP3678453B2 JP 3678453 B2 JP3678453 B2 JP 3678453B2 JP 05789195 A JP05789195 A JP 05789195A JP 5789195 A JP5789195 A JP 5789195A JP 3678453 B2 JP3678453 B2 JP 3678453B2
- Authority
- JP
- Japan
- Prior art keywords
- brake rotor
- aluminum
- powder
- based composite
- mixed
- 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.)
- Expired - Fee Related
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Description
【０００１】
【産業上の利用分野】
本発明はアルミニウム基複合材ブレーキロータに関し、特に自動車、鉄道車両、産業機械などの分野で使用される摺動部材であって初期から安定した摩擦特性を良好に発揮できるものである。
【０００２】
【従来の技術及び発明が解決しようとする課題】
自動車等のブレーキ装置の軽量化のためにセラミックス粉末等の強化粒子とアルミニウム合金とからなるアルミニウム基複合材ブレーキロータが使用されている。このようなブレーキロータの摩擦パッドとの摺動面には、パッド材からの移着物が多数見られるが、これらは均一には分布せずに移着物の少ない部分では線条痕状のスコーリングが発生しやすくなる。これと同時に該ブレーキロータ摺動面は粗面となるので安定した摩擦力は得られにくく、また移着物の堆積は，摩擦制動の負荷や回数で変化し、特に初期の摩擦特性は不安定である。
【０００３】
【課題を解決するための手段】
本発明はこのような問題を解決するため検討の結果、ブレーキロータの摺動面に、該摺動面と摩擦パッドとの摩擦により堆積する移着物を予め人工的に形成しておくことで上記の問題点を解消したアルミニウム基複合材ブレーキロータを開発したものである。
【０００４】
即ち本発明はアルミニウム基複合材からなるブレーキロータであって、該ブレーキロータは、摩擦パッド材粉末と、ブレーキロータを構成するアルミニウム合金粉末及び強化粒子とを、アルミニウム合金が一部液相を発生する温度にて混練した混合材からなる層により摺動面が形成されていることを特徴とするものである。
【０００５】
【作用】
従来の摩擦パッドとアルミニウム基複合材ブレーキロータとの摩擦時に生成される移着物は、ミクロ的観察によると互いの構成材料が高温と高圧とによって混練された状態の混合材からなっている。そこでこのような混合材を予めブレーキロータの摺動面に形成しておくことにより該摺動面に移着物が均一に分布していることになり、初期時点から安定した摩擦特性が得られると同時に耐スコーリング性に優れたブレーキロータが得られる。
【０００６】
次に製造法について説明する。
▲１▼摩擦パッド材の粉末、及びブレーキロータを構成するアルミニウム合金粉末と強化粒子を適量配合し攪拌して混合粉末を得る。
▲２▼この混合粉末を予熱して十分ガスを放出させる。
▲３▼これを加熱可能な混練機に投入し、アルミニウム合金粉末が一部液相を発生させる温度域に保持する。
▲４▼該混合粉末が一部液相を発生するか、もしくは流動を起こす温度域で該混合粉末に剪断力を加えながら混練した後、冷却して混合材を得る。
▲５▼この混合材がブレーキロータの摺動面に存在するようにブレーキロータの摺動面形状を成形する。
例えばブレーキロータの摺動面形状を成形する金型内に、それぞれ適量の上記混合粉末／アルミニウム複合材粉末／上記混合粉末を順に３層になるように投入し、予備成形の後半溶融温度下でプレス成形して本発明のブレーキロータを得る。
【０００７】
【実施例】
次に本発明を実施例に基づいて説明する。
【０００８】
パッド材の製造工程から多量に排出される摩擦パッド材の研磨粉とアルミニウム合金粉末（ＡＣ４Ｃ）と強化粒子（アルミナ）とを５：７：３の重量比で配合して乳鉢で１０分乾式攪拌を行い混合粉末ａを得た。該混合粉末ａを４００℃×１０分間空気雰囲気中で予熱し十分にガスを放出させた。次に該混合粉末を図１示すような混練機ｂ内に投入して内蔵したヒーターｃで該混練機ｂ内の温度を５７０℃とし、該混合粉末ａが一部液相を発生する温度域（540 〜 560℃）に１０分間保持した。
【０００９】
次に該混合粉末ａが流動を起こしやすい５４０〜５６０℃の温度に保持して混練機ｂ内のすり棒ｂ１を６０rpm で回転させ、混合粉末ａに剪断力を加えながら攪拌を行った。その後該混合粉末ａを冷却して混合材ａ１を得た。
そして図２に示すような外ダイｄ１及び内ダイｄ２と下パンチｄ３及び上パンチｄ４からなるリング状の金型ｄ内に、混合材ａ１／アルミニウム複合材粉末ｅ／混合材ａ１の順に投入して予備プレスの後、半溶融温度（540 〜 560℃）に１０分間保持して素早く２００ＭＰａの圧力を加え徐冷して成形体を得た。この成形体を通常の工程で切削加工して目的のブレーキロータを得た。
【００１０】
【発明の効果】
このように本発明によれば、ブレーキ制動の初期から安定した摩擦特性を発揮できる軽量のブレーキロータを提供できる効果を有する。
【図面の簡単な説明】
【図１】混練機を説明する説明図である。
【図２】本発明ブレーキロータの摺動面部の成形方法を示す説明図である。
【符号の説明】
ａ 混合粉末
ａ１ 混合材
ｂ 混練機
ｂ１ すり棒
ｃ ヒーター
ｄ 金型
ｄ１ 外ダイ
ｄ２ 内ダイ
ｄ３ 下パンチ
ｄ４ 上パンチ
ｅ アルミニウム複合材[0001]
[Industrial application fields]
The present invention relates to an aluminum-based composite brake rotor, and is particularly a sliding member used in the fields of automobiles, railway vehicles, industrial machines, etc., and can exhibit a stable friction characteristic from the beginning.
[0002]
[Prior art and problems to be solved by the invention]
2. Description of the Related Art An aluminum-based composite brake rotor made of reinforcing particles such as ceramic powder and an aluminum alloy is used to reduce the weight of a brake device for an automobile or the like. A large number of transferred materials from the pad material are found on the sliding surface of the brake rotor with the friction pad. Is likely to occur. At the same time, the sliding surface of the brake rotor becomes rough, so that it is difficult to obtain a stable frictional force, and the accumulation of transferred materials changes depending on the load and frequency of friction braking, and the initial friction characteristics are particularly unstable. is there.
[0003]
[Means for Solving the Problems]
As a result of studies to solve such problems, the present invention has been described above by artificially forming in advance a transfer object that accumulates due to friction between the sliding surface and the friction pad on the sliding surface of the brake rotor. This is an aluminum-based composite brake rotor that has solved this problem.
[0004]
That is, the present invention is a brake rotor made of an aluminum-based composite material, wherein the brake rotor generates friction pad material powder, aluminum alloy powder and reinforcing particles constituting the brake rotor, and the aluminum alloy generates a liquid phase partially. The sliding surface is formed by a layer made of a mixed material kneaded at a temperature.
[0005]
[Action]
According to microscopic observation, the transfer material generated during the friction between the conventional friction pad and the aluminum matrix composite brake rotor is made of a mixed material in which the constituent materials are kneaded at a high temperature and a high pressure. Therefore, by forming such a mixed material on the sliding surface of the brake rotor in advance, the transferred material is uniformly distributed on the sliding surface, and a stable friction characteristic can be obtained from the initial time point. At the same time, a brake rotor with excellent scoring resistance can be obtained.
[0006]
Next, a manufacturing method is demonstrated.
(1) A suitable amount of powder of friction pad material, aluminum alloy powder constituting the brake rotor and reinforcing particles are mixed and stirred to obtain a mixed powder.
(2) The mixed powder is preheated to sufficiently release gas.
{Circle around (3)} This is put into a heatable kneader and kept in a temperature range in which the aluminum alloy powder partially generates a liquid phase.
(4) The mixed powder is kneaded while applying a shearing force in a temperature range where the mixed powder partially generates a liquid phase or flows, and then cooled to obtain a mixed material.
(5) The shape of the sliding surface of the brake rotor is formed so that this mixed material exists on the sliding surface of the brake rotor.
For example, a proper amount of the mixed powder / aluminum composite material powder / the mixed powder is put into a mold for forming the sliding surface shape of the brake rotor in order of three layers, respectively, The brake rotor of the present invention is obtained by press molding.
[0007]
【Example】
Next, this invention is demonstrated based on an Example.
[0008]
Friction pad material abrasive powder, aluminum alloy powder (AC4C) and reinforcing particles (alumina) discharged in large quantities from the pad material manufacturing process are mixed in a weight ratio of 5: 7: 3 and dry-stirred in a mortar for 10 minutes. And mixed powder a was obtained. The mixed powder a was preheated in an air atmosphere at 400 ° C. for 10 minutes to sufficiently release gas. Next, the mixed powder is put into a kneader b as shown in FIG. 1, and the temperature inside the kneader b is set to 570 ° C. with a built-in heater c. The temperature range in which the mixed powder a partially generates a liquid phase. (540-560 ° C.) for 10 minutes.
[0009]
Next, the mixed powder a was maintained at a temperature of 540 to 560 ° C. at which the mixed powder a was likely to flow, and the grinder b1 in the kneader b was rotated at 60 rpm, and stirring was performed while applying a shearing force to the mixed powder a. Thereafter, the mixed powder a was cooled to obtain a mixed material a1.
Then, the mixed material a1 / aluminum composite powder e / mixed material a1 are put in this order into a ring-shaped mold d composed of the outer die d1, the inner die d2, the lower punch d3, and the upper punch d4 as shown in FIG. After the preliminary pressing, the molded body was obtained by holding at a semi-melting temperature (540 to 560 ° C.) for 10 minutes and quickly applying a pressure of 200 MPa and gradually cooling. The molded body was cut by a normal process to obtain a target brake rotor.
[0010]
【The invention's effect】
As described above, according to the present invention, it is possible to provide a lightweight brake rotor capable of exhibiting stable friction characteristics from the initial stage of brake braking.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram for explaining a kneading machine.
FIG. 2 is an explanatory view showing a method for forming a sliding surface portion of the brake rotor of the present invention.
[Explanation of symbols]
a Mixed powder a1 Mixed material b Kneading machine b1 Grinding rod c Heater d Mold d1 Outer die d2 Inner die d3 Lower punch d4 Upper punch e Aluminum composite material
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05789195A JP3678453B2 (en) | 1995-02-22 | 1995-02-22 | Aluminum-based composite brake rotor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05789195A JP3678453B2 (en) | 1995-02-22 | 1995-02-22 | Aluminum-based composite brake rotor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08226477A JPH08226477A (en) | 1996-09-03 |
| JP3678453B2 true JP3678453B2 (en) | 2005-08-03 |
Family
ID=13068617
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP05789195A Expired - Fee Related JP3678453B2 (en) | 1995-02-22 | 1995-02-22 | Aluminum-based composite brake rotor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3678453B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6306340B1 (en) * | 1999-10-22 | 2001-10-23 | Daimlerchrysler Corporation | Method of making a brake rotor |
-
1995
- 1995-02-22 JP JP05789195A patent/JP3678453B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08226477A (en) | 1996-09-03 |
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