JPH02113169A - Aluminum piston and manufacture thereof - Google Patents
Aluminum piston and manufacture thereofInfo
- Publication number
- JPH02113169A JPH02113169A JP26597788A JP26597788A JPH02113169A JP H02113169 A JPH02113169 A JP H02113169A JP 26597788 A JP26597788 A JP 26597788A JP 26597788 A JP26597788 A JP 26597788A JP H02113169 A JPH02113169 A JP H02113169A
- Authority
- JP
- Japan
- Prior art keywords
- piston
- pin
- aluminum
- edge
- cavity
- 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
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 36
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 36
- 238000004519 manufacturing process Methods 0.000 title claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 4
- 238000005275 alloying Methods 0.000 claims description 3
- 238000013329 compounding Methods 0.000 claims description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 abstract description 6
- 229910045601 alloy Inorganic materials 0.000 abstract description 4
- 239000000956 alloy Substances 0.000 abstract description 4
- 239000010949 copper Substances 0.000 abstract description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052802 copper Inorganic materials 0.000 abstract description 3
- 229910052759 nickel Inorganic materials 0.000 abstract description 2
- 239000004411 aluminium Substances 0.000 abstract 2
- 208000025599 Heat Stress disease Diseases 0.000 abstract 1
- 239000000463 material Substances 0.000 description 16
- 239000000835 fiber Substances 0.000 description 7
- 238000005496 tempering Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 239000002131 composite material Substances 0.000 description 4
- 238000010894 electron beam technology Methods 0.000 description 4
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical class [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 4
- 238000005266 casting Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000012925 reference material Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F3/00—Pistons
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F1/00—Cylinders; Cylinder heads
- F02F2001/008—Stress problems, especially related to thermal stress
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2201/00—Metals
- F05C2201/02—Light metals
- F05C2201/021—Aluminium
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、アルミ・ピストン及びその製造方法に係わり
、特にその熱疲労強度を改ＩＦしたアルミ・ピストン及
びその製造方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an aluminum piston and a method for manufacturing the same, and more particularly to an aluminum piston whose thermal fatigue strength has been improved and a method for manufacturing the same.
「従来の技術］
一般に、アルミ・ピストンは軽量で熱伝導性が良いこと
から、乗用車のエンジンに多用されている９上記アルミ
・ピストンを製造する場合、高い強度や良好な鋳造性が
要求されるため、アルミ材の中でも主にＪＩＳ ＡＣ２
＾、ＡＣ２Ｂ、ＡＣ４Ｂ、ＡＣ４Ｃ材等を採用Ｌ″′Ｃ
鋳造成形していた。"Prior Art" In general, aluminum pistons are lightweight and have good thermal conductivity, so when manufacturing the aluminum pistons listed above, which are often used in passenger car engines, high strength and good castability are required. Therefore, among aluminum materials, mainly JIS AC2
^, AC2B, AC4B, AC4C materials are used L'''C
It was molded by casting.
し発明が解決し、ようとする課題］ ところが、近年エンジンの出力向上に伴い。[Problems that the invention aims to solve] However, with the increase in engine output in recent years.
ピストンの機械的負荷及び熱的負荷が増大し、ているた
め、１この種のアルミ・ビ、ストン１にあっては、第５
図に示す如くピストン頭部２のキャビティ３のピン方向
Ｐの縁部に上記機械的負荷による疲労強度亀裂４が発生
し、ピンとスラスト方向Ｓの縁部に上記熱的負荷による
熱亀裂５が発生していた。Due to the increased mechanical and thermal loads on the piston, 1.
As shown in the figure, fatigue strength cracks 4 occur at the edge of the cavity 3 of the piston head 2 in the pin direction P due to the mechanical load, and thermal cracks 5 occur at the edge of the pin and the thrust direction S due to the thermal load. Was.
一般にハイサイクル疲労強度には引張強度及び硬度の向
上が有効であるが、ローサイクルの熱疲労強度には反対
に低剛性で伸び特性に優れた材料の方が優位である。従
って、同一のアルミ材で鋳造していたアルミ・ピストン
では、ハイサイクル疲労強度とローサイクルの熱強度と
のどちらがの強度を優先させると一方の強度が低ｒする
という問題があった。In general, improving tensile strength and hardness is effective for high-cycle fatigue strength, but on the contrary, materials with low rigidity and excellent elongation properties are advantageous for low-cycle thermal fatigue strength. Therefore, in aluminum pistons that are cast from the same aluminum material, there is a problem in that when either high-cycle fatigue strength or low-cycle thermal strength is given priority, the strength of the other becomes low.
上述の々口き課題に鑑みて本発明は、ハイサイクル疲労
強度とローサイクル熱強度との双方の強度に優れたアル
ミ・ピストンを提供することを目的とするものである。In view of the above-mentioned problems, an object of the present invention is to provide an aluminum piston that is excellent in both high-cycle fatigue strength and low-cycle thermal strength.
［課題を解決するための手段］
Ｌ記目的を達成すべく本発明は、全体がＴ５あるいはＴ
６熱処理されたアルミ・ピストンにおいて、ピストン頭
部のキャビティのピン方向縁部がハイサイクル疲労強度
を有する強化部にて形成されると共に、ピンとスラスト
方向縁部がローサイクル熱強度を有する軟化部にて形成
されたものである。[Means for Solving the Problems] In order to achieve the object described in L, the present invention has the following features:
6. In a heat-treated aluminum piston, the edge in the pin direction of the cavity of the piston head is formed of a reinforced part with high cycle fatigue strength, and the pin and thrust direction edges are formed into a softened part with low cycle thermal strength. It was formed by
また、アルミ・ピストンの全体をＴ５あるいはＴ６熱処
理し、た後、ピストン頭部のキャビティのピン方向縁部
を複合化あるいは合金化し、て強化すると共に、ピンと
スラスト方向縁部をピストンの最高運転温度以上の温度
で焼戻して軟化するようにしたものである。In addition, after the entire aluminum piston is heat treated to T5 or T6, the edge of the piston head cavity in the pin direction is composited or alloyed to strengthen it, and the pin and thrust edge are heated to the maximum operating temperature of the piston. It is tempered and softened at a temperature above.
［作用］
アルミ・ピストンのピストン頭部のピン方向にはハイサ
イクル振動が掛がり易く、ピンとスラスト方向にはロー
サイクルの振動が掛がり易い９そのため、ピストン頭部
のキャビティのピン方向縁部にはハイサイクル振動に疲
労強度亀裂が発生し、ピンとスラスト方向縁部には熱亀
裂が発生ずる。[Function] High cycle vibrations tend to be applied to the pin direction of the piston head of an aluminum piston, and low cycle vibrations are likely to be applied to the pin and thrust directions9. Therefore, the edge of the cavity in the piston head direction in the pin direction Fatigue strength cracks occur due to high-cycle vibration, and thermal cracks occur on the pins and edges in the thrust direction.
そ、二で、アルミ・ピストンの全体を１゛５あるいはＴ
６熱処理し２、ピストン頭部のキャビティのピン方向縁
部を複合化あるいは合金化し、て強化部を形成すると共
に、ピンとスラスト方向縁部をピストンの最高運転温度
以上の温度で焼戻し、て軟化部を形成する。これにより
、上記複合化あるいは合金化し、た強化部がハイサイク
ル疲労強度対して潰れ、ピストンの最高運転温度以上の
温度で焼戻してＴ５あるいはＴ６熱処理無し５の状態に
し、た軟化部がローサイクル熱強度に浸れることになる
。上記焼戻し温度をピストンの最高運転温度以上の温度
としたのは、焼戻しで熱的変化を防止するためであり、
溶体化処理温度を超えると１゛５あるいはＴ６熱処理の
効果が冷却後発生するのを防止するなめである。Second, the entire aluminum piston is 1゛5 or T.
6. Heat treatment 2. Composite or alloy the edge of the cavity in the piston head direction in the direction of the pin to form a reinforced part, and temper the edge of the pin and thrust direction at a temperature higher than the maximum operating temperature of the piston to form a softened part. form. As a result, the composite or alloyed reinforced part collapses against high cycle fatigue strength, is tempered at a temperature higher than the maximum operating temperature of the piston to a state without T5 or T6 heat treatment5, and the softened part is reduced to low cycle fatigue strength. You will be immersed in the strength. The reason why the above tempering temperature is higher than the maximum operating temperature of the piston is to prevent thermal changes during tempering.
This is to prevent the effects of 1゛5 or T6 heat treatment from occurring after cooling if the temperature exceeds the solution treatment temperature.
［実施例］
以下に本発明のアルミ・ピストンの一実施例を添付図面
に基づいて詳述する。[Example] An example of the aluminum piston of the present invention will be described below in detail with reference to the accompanying drawings.
本発明のアルミニウムピストンは、特に材質的改良を加
えたものである。このアルミ・ピストンは第５図に示し
、た従来のピストン形状と同一形状に鋳造成形されてい
る。当該アルミ・ピストンは、ＪＩＳ ＡＣ２Ａ、＾Ｃ
２Ｂ、八〇４Ｂ、＾Ｃ４Ｃ材等のアルミニウム合金をピ
ストンの鋳型内に鋳込んで形成されたものである。そし
て、アルミ・ピストン１０は全体にＴ５あるいはＴ６熱
処理が施されて、第１図に示す如く、硬化部１１とし、
て形成されている９まな、４二のアルミ・ピ、ストン１
０のピストン頭部２のキャビティ３のピン方向Ｐ両縁部
が半円状の強化部１２とし、て形成されている。この強
化部１２は例えばニッケル（Ｎｉ）や銅（Ｃｕ）等を添
加した合金、あるいは炭化珪素ウィスカー（Ｓｉ０２）
や短繊維あるいは長繊維等の繊維強化金属（ＦＲＭ）に
て形成されている。また、上記ピストン頭部２のキャビ
ティ３のピンとスラスト方向縁部縁部が焼戻されて半円
状の軟化部１３として形成されている。The aluminum piston of the present invention has particularly improved material properties. This aluminum piston is shown in FIG. 5 and is cast into the same shape as the conventional piston. The aluminum piston is JIS AC2A, ^C
It is formed by casting aluminum alloy such as 2B, 804B, ^C4C material into the piston mold. The aluminum piston 10 is then subjected to T5 or T6 heat treatment to form a hardened portion 11 as shown in FIG.
9 pins, 42 aluminum pins, and 1 stone are formed.
Both edges in the pin direction P of the cavity 3 of the piston head 2 of No. 0 are formed as semicircular reinforced portions 12. This reinforced portion 12 is made of, for example, an alloy containing nickel (Ni), copper (Cu), etc., or silicon carbide whiskers (Si02).
It is made of fiber reinforced metal (FRM) such as short fibers or long fibers. Further, the pin and the edge of the cavity 3 of the piston head 2 in the thrust direction are tempered to form a semicircular softened portion 13.
尚、図中１４はピストンピンであり、これにより上記ピ
ン方向Ｐ、ピンとスラスト方向Ｓを特定する。14 is a piston pin, which specifies the pin direction P and the pin and thrust direction S.
次に本発明のアルミ・ピストンの製造方法の一実施例及
びこれら実施例における作用を述べる。Next, one embodiment of the method for manufacturing an aluminum piston of the present invention and the effects of these embodiments will be described.
まず、ＪＩＳ ＡＣ２Ａ、ＡＣ２Ｂ、ＡＣ４Ｂ、へＣ４
Ｃ材等（７）７／レミニウム合金をビスｊ−ンの鋳型内
に鋳込む。その後、型抜きし、た成形品の全体にＴ５あ
るいはＴ６熱処理を施し、て、引張強度及び硬度を向上
させる。これによりアルミ・ピストン１０の全体は、上
記硬化部１１として形成される４そし、て、Ｔ５あるい
はＴ６熱処理を施したアルミ・ピストン１０のピストン
頭部２のキャビティ３のピン方向Ｐ縁部を複合化あるい
は合金化して強化部１２を形成する９上記合金化は、高
密度エネルギー源で上記ピストン頭部２のキャビティ３
のピン方向Ｐ両縁部を局部的に半円状に再溶融し２、ニ
ラゲル（Ｎｉ）や銅（Ｃｔ、＋）等の合金元素を添加し
、て凝固させるものである。また上記複合化は、上記ピ
ストン頭部２のキャビティ３のピン方向Ｐ縁部を高密度
エネルギー源で局部的に半円状に再溶融し１．炭化珪素
ウィスカー（ＳｉＯ２）や短繊維あるいは長繊維等を鋳
込み局部的に繊維強化金属（ＦＲＭ）とし、て強化する
ものである。上記高密度エネルギー源には、例えばティ
グアーク（ＴＩＧ）、電子ビーム（ＥＢ）あるいはレー
ザービーム（ＬＢ）等を使用する、二のキャビティ３の
ピン方向Ｐ両縁部の複合化は、Ｔ５あるいはＴ６熱処理
を施す前のアルミ・ピストン１０の鋳造成形時に、上記
炭化珪素ウィスカー（Ｓｉ０２）や短繊維あるいは長繊
維等を鋳込んで形成し、ても良い。そし、て、上記ピス
トン頭部２のキャビティ３のピンとスラスト方向Ｓ両縁
部を高密度エネルギー源で半円状に焼戻して軟化部１３
を形成する。この高密度エネルギー源には、同様に例え
ばティグアーク（ＴＩＧ）、電子ビーム（ＥＢ）あるい
はレーザービーム（ＬＢ）等を使用する。その焼戻し、
温度条件は、ピストンが運転中に負荷される最高温度以
上の温度とし、例えば約４００〜４５０’Ｃで３ｈｒ焼
き戻す。焼戻し、温度をピストンが運転中に負荷される
最高温度以上の温度とし、たのは、焼戻しで熱的変化を
防止するためであり、溶体化処理温度を超えるとＴ５あ
るいはＴ６熱処理の効果が冷却後発生するのを防止する
ためである。First, JIS AC2A, AC2B, AC4B, C4
C material, etc. (7) 7/Cast the reminium alloy into a bis jean mold. Thereafter, the entire molded product is subjected to T5 or T6 heat treatment to improve tensile strength and hardness. As a result, the entire aluminum piston 10 is formed by forming the hardened portion 11 4 and the pin direction P edge of the cavity 3 of the piston head 2 of the aluminum piston 10 which has been subjected to T5 or T6 heat treatment. 9. The alloying is performed using a high-density energy source to form the reinforced portion 12 in the cavity 3 of the piston head 2.
Both edges in the pin direction P are locally remelted in a semicircular shape 2, and an alloying element such as Niragel (Ni) or copper (Ct, +) is added thereto and solidified. Further, the above-mentioned compounding is achieved by locally remelting the edge of the cavity 3 of the piston head 2 in the pin direction P in a semicircular shape using a high-density energy source.1. Silicon carbide whiskers (SiO2), short fibers, long fibers, etc. are cast to locally form fiber-reinforced metal (FRM) for reinforcement. For example, TIG arc (TIG), electron beam (EB), or laser beam (LB) is used as the high-density energy source, and the composite of both edges of the second cavity 3 in the pin direction P is treated with T5 or T6 heat treatment. The silicon carbide whiskers (Si02), short fibers, long fibers, etc. may be cast and formed when the aluminum piston 10 is cast before being formed. Then, the pin of the cavity 3 of the piston head 2 and both edges in the thrust direction S are tempered into a semicircular shape using a high-density energy source to form a softened portion 13.
form. Similarly, for example, a TIG arc (TIG), an electron beam (EB), or a laser beam (LB) is used as the high-density energy source. Its tempering,
The temperature condition is a temperature higher than the maximum temperature to which the piston is subjected during operation, and is tempered at about 400 to 450'C for 3 hours, for example. The tempering temperature was set to a temperature higher than the maximum temperature to which the piston is subjected during operation, in order to prevent thermal changes during tempering.If the temperature exceeds the solution treatment temperature, the effect of T5 or T6 heat treatment will be reduced. This is to prevent this from occurring later.
一般に焼戻しによりアルミ材のＴ５あるいはＴ６熱処理
効果は、温度と時間とのパラメータで示され、温度の上
昇、時間の増加とともに軟化していく９例えばＡＣ２Ｂ
材にＴ６熱処理を施し１．２６０’Ｃで焼戻しな時の硬
度を第２図に示す、この２６０ ”Ｃでは、約３ｈｒで
処理するとＦ材と同等の硬さまで軟化し、さらに１００
ｈｒではより大巾に軟化する。In general, the T5 or T6 heat treatment effect of aluminum materials due to tempering is expressed by the parameters of temperature and time, and softens as the temperature and time increase.9For example, AC2B
Figure 2 shows the hardness when the material is subjected to T6 heat treatment and tempered at 1.260'C. At this 260"C, when treated for about 3 hours, it softens to the same hardness as material F, and further softens to 100"C.
In hr, it softens more widely.
また、このＴ６熱処理を施し、２６０°Ｃで、、３ｈｒ
と１００ｈｒとで焼戻しなＡＣ２Ｂ材のローサイクルの
熱疲労強度を第３図に示す。図示するように、ＡＣ２Ｂ
材をＴ６熱処理したままのものに比べて、３ｈｒ焼戻し
たものでは５＠、１００ｈｒ焼戻し、たものでは８倍も
の驚異的な熱疲労強度を示す。図中−点鎖線で示すＡは
、金型内で冷却した参考材である９すなわち、本実施例
にあっては上記的４００〜４５０℃で３ｈｒ焼き戻すの
で、軟化効果に優れている。In addition, this T6 heat treatment was performed at 260°C for 3 hours.
Figure 3 shows the low cycle thermal fatigue strength of AC2B material tempered for 100 hours. As shown, AC2B
Compared to the material that has been subjected to T6 heat treatment, the material that has been tempered for 3 hours has an amazing thermal fatigue strength of 5@, and the material that has been tempered for 100 hours has an amazing thermal fatigue strength of 8 times. A shown by the dotted chain line in the figure is a reference material 9 cooled in the mold, that is, in this example, it is tempered at 400 to 450° C. for 3 hours, so it has an excellent softening effect.
二、二で１．二のアルミ・ピストン１０のビ、ストン頭
部２のピン方向Ｐにはハイサイクル振動が掛かり易く、
ピンとスラスト方向Ｓには口〜サイクルの振動が掛かり
易く、上記ピストン頭部２のキャビティ３のピン方向Ｐ
縁部にはハイサイクル振動に疲労強度亀裂が発生し、ピ
ンとスラスト方向Ｓ縁部には熱亀裂が発生する。上記ハ
イサイクル振動には、引張強度及び硬度が高いほうが寿
命が長く、ローサイクル振動には、軟らかく伸びの大き
い材料のほうが寿命が長い。Two, two and one. High cycle vibration is likely to be applied to the pin direction P of the second aluminum piston 10 and the piston head 2,
The pin and the thrust direction S are susceptible to vibration from the mouth to the cycle, and the pin direction P of the cavity 3 of the piston head 2 is likely to be applied to the pin and the thrust direction S.
Fatigue strength cracks occur at the edges due to high-cycle vibration, and thermal cracks occur at the pin and thrust direction S edges. For high-cycle vibrations, materials with higher tensile strength and hardness have a longer lifespan, and for low-cycle vibrations, materials that are softer and have greater elongation have a longer lifespan.
従って、上記複合化あるいは合金化した強化部１２がハ
イサイクル疲労強度対し、て優れ、ピストンの最高運転
温度以上の温度で焼戻してＴ５あるいはＴ６熱処理無し
、の状態にし、た軟化部１３がローサイクル熱強度に浸
れることになる５尚、第４図はエンジンの運転状態に件
ってピストンの温度・応力の変化を示すものである。Therefore, the composite or alloyed reinforced portion 12 has excellent high-cycle fatigue strength, and the softened portion 13, which is tempered at a temperature higher than the maximum operating temperature of the piston without T5 or T6 heat treatment, has excellent high-cycle fatigue strength. Figure 4 shows changes in the temperature and stress of the piston depending on the operating conditions of the engine.
図中りはローサイクル域を示し、Ｈはハイサイクル（エ
ンジン振動による桟械的応力）を示すものである。The middle part of the figure shows the low cycle region, and H shows the high cycle (mechanical stress due to engine vibration).
［発明の効果］
以上要するに本発明の請求項１及び請求項２によれば、
ハイサイクル疲労強度とローサイクルの熱疲労強度との
双方の強度に優れたアルミ・ピストンを提供することが
できる９[Effect of the invention] In summary, according to claims 1 and 2 of the present invention,
Can provide aluminum pistons with excellent strength in both high-cycle fatigue strength and low-cycle thermal fatigue strength9
第１図は本発明のアルミ・ピストンを示す斜視図、第２
図は本発明の焼戻しの保持時間と硬さの関係を示すグラ
フ、第３図は正振幅と熱寿命の関係を示すグラフ、第４
図はエンジンの運転状態に伴うピストンの温度及び応力
変化を示すグラフ、第５図は従来のピストンに生じた疲
労強度亀裂及び熱亀裂を示す斜視図である９
図中、２はピストン頭部、３はキャビティ、１０はアル
ミ・ピストン、１２は強化部、１３は軟化部Ｐはピン方
向、Ｓはピンとスラスト方向である。
特許出願人 いず−′自動車株式会社代理人弁理士
絹 谷 信 雄石更づ
（ＨＢ ”１５００）
零くシ七キ子スト・１フイクル１０デｒαた一２メた
第３図
第４図
Ｃ／）ｍ（、ＭＮＯＯＪ〜
第５図Figure 1 is a perspective view showing the aluminum piston of the present invention, Figure 2 is a perspective view showing the aluminum piston of the present invention.
The figure is a graph showing the relationship between tempering retention time and hardness of the present invention, Figure 3 is a graph showing the relationship between positive amplitude and thermal life, and Figure 4 is a graph showing the relationship between positive amplitude and thermal life.
The figure is a graph showing temperature and stress changes in the piston due to engine operating conditions, and Figure 5 is a perspective view showing fatigue cracks and thermal cracks that occur in a conventional piston.9 In the figure, 2 is the piston head; 3 is a cavity, 10 is an aluminum piston, 12 is a reinforced part, 13 is a softened part P is in the pin direction, and S is in the pin and thrust direction. Patent applicant: Izu-' Jidosha Co., Ltd. Representative Patent Attorney
Kinu Tani Nobuo Sarazu Oishi (HB "1500) Zero Shichikiko Strike 1 Fukuru 10 Derα Ta 2 Meta Figure 3 Figure 4 C/) m (, MNOOJ ~ Figure 5
Claims (1)
トンにおいて、ピストン頭部のキャビティのピン方向縁
部がハイサイクル疲労強度を有する強化部にて形成され
ると共に、ピンとスラスト方向縁部がローサイクル熱強
度を有する軟化部にて形成されたことを特徴とするアル
ミ・ピストン。 ２、アルミ・ピストンの全体をＴ５あるいはＴ６熱処理
した後、ピストン頭部のキャビティのピン方向縁部を複
合化あるいは合金化して強化すると共に、ピンとスラス
ト方向縁部をピストンの最高運転温度以上の温度で焼戻
して軟化するようにしたことを特徴とするアルミ・ピス
トンの製造方法。[Claims] 1. In an aluminum piston that has been entirely T5 or T6 heat treated, the edge of the cavity in the piston head in the pin direction is formed of a reinforced part with high cycle fatigue strength, and the pin and thrust direction An aluminum piston characterized in that an edge portion is formed of a softened portion having low cycle thermal strength. 2. After the entire aluminum piston is subjected to T5 or T6 heat treatment, the edge of the piston head cavity in the direction of the pin is reinforced by compounding or alloying, and the pin and the edge of the thrust direction are heated to a temperature higher than the maximum operating temperature of the piston. A method for manufacturing an aluminum piston, characterized in that the aluminum piston is tempered and softened.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63265977A JP2701376B2 (en) | 1988-10-24 | 1988-10-24 | Aluminum piston and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63265977A JP2701376B2 (en) | 1988-10-24 | 1988-10-24 | Aluminum piston and manufacturing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02113169A true JPH02113169A (en) | 1990-04-25 |
| JP2701376B2 JP2701376B2 (en) | 1998-01-21 |
Family
ID=17424657
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63265977A Expired - Fee Related JP2701376B2 (en) | 1988-10-24 | 1988-10-24 | Aluminum piston and manufacturing method thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2701376B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2798180A1 (en) | 1999-07-30 | 2001-03-09 | Unisia Jecs Corp | PISTON OF INTERNAL COMBUSTION ENGINE AND METHOD FOR THE PRODUCTION THEREOF |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59108849A (en) * | 1982-12-14 | 1984-06-23 | Toyota Motor Corp | Piston for internal-combustion engine |
| JPS6210455A (en) * | 1985-07-08 | 1987-01-19 | Mazda Motor Corp | Piston structure of direct injection type engine |
-
1988
- 1988-10-24 JP JP63265977A patent/JP2701376B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59108849A (en) * | 1982-12-14 | 1984-06-23 | Toyota Motor Corp | Piston for internal-combustion engine |
| JPS6210455A (en) * | 1985-07-08 | 1987-01-19 | Mazda Motor Corp | Piston structure of direct injection type engine |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2798180A1 (en) | 1999-07-30 | 2001-03-09 | Unisia Jecs Corp | PISTON OF INTERNAL COMBUSTION ENGINE AND METHOD FOR THE PRODUCTION THEREOF |
| US6427579B1 (en) | 1999-07-30 | 2002-08-06 | Unisia Jecs Corporation | Piston of internal combustion engine and method of producing same |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2701376B2 (en) | 1998-01-21 |
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