JPH051622A - Al alloy piston for internal combustion engine and its manufacture - Google Patents
Al alloy piston for internal combustion engine and its manufactureInfo
- Publication number
- JPH051622A JPH051622A JP3008507A JP850791A JPH051622A JP H051622 A JPH051622 A JP H051622A JP 3008507 A JP3008507 A JP 3008507A JP 850791 A JP850791 A JP 850791A JP H051622 A JPH051622 A JP H051622A
- Authority
- JP
- Japan
- Prior art keywords
- heat
- piston
- resistant
- alloy
- region
- 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
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
- F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
- F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
- F02B23/0672—Omega-piston bowl, i.e. the combustion space having a central projection pointing towards the cylinder head and the surrounding wall being inclined towards the cylinder center axis
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
- F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
- F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
- F02B23/0603—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston at least part of the interior volume or the wall of the combustion space being made of material different from the surrounding piston part, e.g. combustion space formed within a ceramic part fixed to a metal piston head
- F02B2023/0612—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston at least part of the interior volume or the wall of the combustion space being made of material different from the surrounding piston part, e.g. combustion space formed within a ceramic part fixed to a metal piston head the material having a high temperature and pressure resistance, e.g. ceramic
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
- F02B2275/14—Direct injection into combustion chamber
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B3/00—Engines characterised by air compression and subsequent fuel addition
- F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は内燃機関用Ａｌ合金製ピ
ストン、特に、内燃機関の運転中に高温熱衝撃を受ける
耐熱領域と、その耐熱領域に連なる主領域とを備えたピ
ストンおよびその製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an Al alloy piston for an internal combustion engine, and more particularly to a piston provided with a heat resistant region which is subjected to high temperature thermal shock during operation of the internal combustion engine and a main region which is continuous with the heat resistant region. Regarding the method.
【０００２】[0002]
【従来の技術】例えば、直接噴射式ディーゼル機関に用
いられるＡｌ合金製ピストンにおいて、その頂部燃焼室
の開口周縁領域は、機関運転中に３００〜５００℃程度
の高温下で繰返し加熱、即ち高温熱衝撃を受ける耐熱領
域である。2. Description of the Related Art For example, in an Al alloy piston used in a direct injection diesel engine, the peripheral region of the opening of the top combustion chamber is repeatedly heated at a high temperature of about 300 to 500.degree. It is a heat-resistant area that receives impact.
【０００３】この耐熱領域における亀裂発生を防止する
ため、従来より種々の構成を有する耐熱領域を備えたピ
ストンが開発されており、例えば、アルフィン法を適用
することによって、ニレジスト等よりなる強化材を鋳ぐ
るんで耐熱領域を形成したもの、耐熱領域の形状を高温
熱衝撃を受けにくい形状にしたもの等が公知である。In order to prevent the occurrence of cracks in the heat-resistant region, pistons having heat-resistant regions having various structures have been developed so far. For example, by applying the Alfin method, a reinforcing material made of Niresist or the like is used. It is known that the heat-resistant region is formed by casting, and the heat-resistant region has a shape that is resistant to high-temperature thermal shock.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、前記ア
ルフィン法によると、次のような問題がある。 通
常、強化材の比重が大きいことに起因してピストンの重
量が増し、それに伴い機関性能の低下を招く、 ピス
トン本体と強化材との接合強度が低く、その接合強度は
ピストン本体の強度の１０分の１程度である、 強化
材の合金元素としては、Ｎｉ等の資源的にも少なく、ま
た高価なものが用いられているので、強化材を用いるこ
とは、省資源化および低コスト化の観点より好ましくな
い、 所定の形状を有する強化材を得るための成形性
が悪く、また鋳造後において、強化材を鋳ぐるんだ部分
の機械加工性も悪いため量産性に欠ける。However, the Alfin method has the following problems. Usually, the weight of the piston increases due to the large specific gravity of the reinforcing material, which causes deterioration of engine performance. The joint strength between the piston body and the reinforcing material is low, and the joint strength is 10 times that of the piston body. As the alloying element of the strengthening material, which is about one-third, is expensive and is also used in terms of resources such as Ni. Therefore, the use of the reinforcing material saves resources and lowers the cost. From the viewpoint, the moldability for obtaining a reinforcing material having a predetermined shape is poor, and the machinability of the part surrounded by the reinforcing material after casting is also poor, resulting in poor mass productivity.
【０００５】一方、前記のように耐熱領域の形状を変え
ることは、機関性能向上のために必要な頂部燃焼室の設
計上の自由度を狭める、といった問題を生じる。On the other hand, changing the shape of the heat-resistant region as described above causes a problem that the degree of freedom in designing the top combustion chamber necessary for improving engine performance is narrowed.
【０００６】本発明は前記従来ピストンの有する各種問
題点を解決することのできる前記ピストンおよびその製
造方法を提供することを目的とする。It is an object of the present invention to provide the piston and a method for manufacturing the piston, which can solve various problems of the conventional piston.
【０００７】[0007]
【課題を解決するための手段】本発明は、内燃機関の運
転中に高温熱衝撃を受ける耐熱領域と、その耐熱領域に
連なる主領域とを備えたＡｌ合金製ピストンにおいて、
前記耐熱領域は、その合金元素量が前記主領域の合金元
素量よりも少なくなるように、局所溶融合金化処理によ
って純Ａｌを合金化させて形成されていることを特徴と
する。SUMMARY OF THE INVENTION The present invention provides an Al alloy piston having a heat-resistant region that is subjected to high-temperature thermal shock during operation of an internal combustion engine, and a main region connected to the heat-resistant region.
The heat resistant region is formed by alloying pure Al by a local melting alloying process so that the amount of alloying elements is smaller than that of the main region.
【０００８】本発明は、内燃機関の運転中に高温熱衝撃
を受ける耐熱領域と、その耐熱領域に連なる主領域とを
備えたＡｌ合金製ピストンを製造するに当り、前記主領
域と同一組成を有するピストン用Ａｌ合金製鋳造体の耐
熱領域形成部に純Ａｌよりなる添加材を付設し、次いで
前記耐熱領域形成部に局所溶融合金化処理を施すことに
よって純Ａｌを合金化させ、その後前記耐熱領域形成部
に機械加工を施すことによって前記耐熱領域を形成する
ことを特徴とする。According to the present invention, when an Al alloy piston having a heat-resistant region that is subjected to high-temperature thermal shock during operation of an internal combustion engine and a main region connected to the heat-resistant region is manufactured, the same composition as the main region is used. The additive material made of pure Al is attached to the heat-resistant region forming portion of the Al alloy cast body for piston having, and then pure Al is alloyed by subjecting the heat-resistant region forming portion to local fusion alloying treatment, and then the heat-resistant region is formed. The heat-resistant region is formed by subjecting the region forming portion to machining.
【０００９】[0009]
【実施例】図１，図２に示す直接噴射式ディーゼル機関
に用いられるＡｌ合金製ピストンＰ1 において、その頂
部燃焼室１の開口周縁領域は、機関運転中に３００〜５
００℃程度の高温下で繰返し加熱による衝撃、即ち高温
熱衝撃を受ける耐熱領域２である。したがって、ピスト
ンＰ1 は耐熱領域２と、その耐熱領域２に連なる主領域
３とを備えている。図中、４はリング溝である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the Al alloy piston P 1 used in the direct injection diesel engine shown in FIGS. 1 and 2, the opening peripheral region of the top combustion chamber 1 is 300 to 5 during engine operation.
The heat-resistant region 2 is subjected to the impact of repeated heating under a high temperature of about 00 ° C., that is, the high temperature thermal impact. Therefore, the piston P 1 has a heat resistant region 2 and a main region 3 continuous with the heat resistant region 2. In the figure, 4 is a ring groove.
【００１０】主領域３はＪＩＳ ＡＣ８Ａ材より構成さ
れ、また耐熱領域２は、その合金元素量が主領域３、し
たがってＡＣ８Ａ材の合金元素量よりも少なくなるよう
に、局所溶融合金化処理によって純Ａｌを合金化させて
形成されている。The main region 3 is made of JIS AC8A material, and the heat-resistant region 2 is purely melted by a local melting alloying treatment so that the alloy element amount thereof is smaller than that of the main region 3, and thus the AC8A material. It is formed by alloying Al.
【００１１】表１は、主領域３と耐熱領域２との組成を
比較したものである。Table 1 compares the compositions of the main region 3 and the heat resistant region 2.
【００１２】[0012]
【表１】 [Table 1]
【００１３】比較のため、ＪＩＳ ＡＣ８Ａのみからな
るピストンＰ2 およびＪＩＳ ＡＣ８Ｂのみからなるピ
ストンＰ3 を製造した。ＪＩＳ ＡＣ８Ｂ材の組成は、
重量％にて、８．５〜１０．５Ｓｉ、２．０〜４．０Ｃ
ｕ、０．５〜１．５Ｍｇ、０．１〜１．０Ｎｉ、残部Ａ
ｌである。For comparison, a piston P 2 consisting only of JIS AC8A and a piston P 3 consisting only of JIS AC8B were manufactured. The composition of JIS AC8B material is
8.5 to 10.5 Si, 2.0 to 4.0 C in wt%
u, 0.5 to 1.5 Mg, 0.1 to 1.0 Ni, balance A
It is l.
【００１４】表２は、本実施例ピストンＰ1 および比較
例ピストンＰ2 ，Ｐ3 における熱衝撃試験結果を示す。
この試験は、次のような方法で行われた。先ず、各ピス
トンＰ1 〜Ｐ3 の頂面をガスバーナにより約３８０℃に
加熱し、次いで各ピストンＰ 1 〜Ｐ3 を約４０℃の冷却
水に浸漬して約７０℃に冷却し、この加熱冷却工程を１
サイクルとして繰返した。１サイクルに要する時間は１
５分間に設定された。そして繰返し回数５０回毎に試験
を約１０分間中断して、各ピストンＰ1 〜Ｐ3 を約４０
℃まで冷却し、その後、染色探傷法により頂部燃焼室１
の開口周縁領域、したがって耐熱領域２における亀裂の
有無を目視にて検査した。Table 2 shows the piston P of this embodiment.1And comparison
Example piston P2, P3The thermal shock test result in is shown.
This test was conducted in the following manner. First, each piss
Ton P1~ P3The top surface of the furnace is heated to approximately 380 ° C by a gas burner.
Heat, then each piston P 1~ P3To about 40 ℃
Immerse in water and cool to about 70 ° C.
Repeated as a cycle. The time required for one cycle is 1
It was set to 5 minutes. And test every 50 repetitions
For about 10 minutes to stop each piston P1~ P3About 40
After cooling to ℃, the top combustion chamber 1 by dye flaw detection
Of the cracks in the peripheral region of the opening of the
The presence or absence was visually inspected.
【００１５】[0015]
【表２】 [Table 2]
【００１６】表２から明らかなように、本実施例ピスト
ンＰ1 は比較例ピストンＰ2 ，Ｐ3 に比べて優れた耐高
温熱衝撃性を有する。As is clear from Table 2, the piston P 1 of the present embodiment has excellent high temperature thermal shock resistance as compared with the pistons P 2 and P 3 of the comparative examples.
【００１７】このような特性が得られるのは、次のよう
な理由によるものと思われる。合金元素であるＳｉは、
Ａｌ合金の熱膨脹を抑制する効果を有するもので、Ａｌ
マトリックス中に微細な結晶として分散している。また
Ｃｕ、Ｍｇ、Ｎｉは、Ａｌ合金の強化元素であってＡｌ
マトリックス中に金属間化合物を形成して固溶してい
る。たゞし、Ｃｕ等の有効性は加熱温度３００℃までの
低温域にて顕著である。The reason why such characteristics are obtained is considered to be as follows. Si, which is an alloying element,
It has the effect of suppressing the thermal expansion of the Al alloy.
It is dispersed as fine crystals in the matrix. Cu, Mg and Ni are strengthening elements of Al alloy and
An intermetallic compound is formed in the matrix to form a solid solution. However, the effectiveness of Cu and the like is remarkable in the low temperature range up to the heating temperature of 300 ° C.
【００１８】このような状況下において、Ａｌ合金が３
００〜５００℃の加熱、それに次ぐ冷却といった冷熱サ
イクル下に保持されると、Ｓｉ結晶とＡｌマトリックス
との熱膨脹量の差異およびＣｕ等の固溶と析出との繰返
しに起因してＡｌ合金には繰返し応力が発生することに
なり、この繰返し応力が３００〜５００℃におけるＡｌ
合金の脆化を招くものと考えられる。Under such a circumstance, if the Al alloy is 3
When kept in a cold heat cycle such as heating at 00 to 500 ° C. and then cooling, the Al alloy is affected by the difference in the thermal expansion amount between the Si crystal and the Al matrix and the repeated solid solution and precipitation of Cu and the like. Repetitive stress is generated, and this repetitive stress is Al at 300 to 500 ° C.
It is considered to cause embrittlement of the alloy.
【００１９】本実施例においては、前記観点より耐熱領
域２の合金元素量を主領域３のそれよりも少なくしたも
ので、これにより前記繰返し応力の僅少化を図って３０
０〜５００℃におけるＡｌ合金の脆化を回避することが
可能となる。In the present embodiment, the amount of alloying elements in the heat-resistant region 2 is made smaller than that in the main region 3 from the above viewpoint, whereby the cyclic stress is reduced to 30
It becomes possible to avoid embrittlement of the Al alloy at 0 to 500 ° C.
【００２０】またベンチ試験において、本実施例ピスト
ンＰ1 では耐熱領域２に亀裂、欠落等の発生は観察され
なかったが、ＪＩＳ ＡＣ８Ａよりなる比較例ピストン
Ｐ2 では耐熱領域２に亀裂および欠落の発生が認められ
た。In the bench test, no cracks or chippings were observed in the heat resistant region 2 of the piston P 1 of this embodiment, but cracks or chippings were found in the heat resistant region 2 of the comparative piston P 2 of JIS AC8A. Occurrence was observed.
【００２１】さらに本実施例ピストンＰ1 は、外径１２
０mmのものにおいて、ニレジスト製強化材を鋳ぐるんだ
ものよりも３０ｇ軽く、これにより軽量化を達成し得る
ことが判る。Further, the piston P 1 of this embodiment has an outer diameter of 12
It can be seen that in the case of 0 mm, the weight is 30 g lighter than that of the casted Ni-resist reinforcing material, which makes it possible to reduce the weight.
【００２２】その上、両領域２，３間に境界を生じるこ
とはないので、前記従来の鋳ぐるみによる接合強度の問
題は生じない。Moreover, since no boundary is formed between the two regions 2 and 3, the problem of the bonding strength due to the conventional cast stuff does not occur.
【００２３】次に、本実施例ピストンＰ1 （外径１２０
mm）の製造方法について説明する。
（１） 図３に示すように、ＪＩＳ ＡＣ８Ａ材を用い
てピストン用Ａｌ合金製鋳造体５を鋳造した。この鋳造
体５は頂部燃焼室１およびリング溝４を備えておらず、
これらは後の工程で機械加工により形成される。
（２） 図４に示すように、鋳造体５において、頂部燃
焼室１の開口周縁領域に対応する耐熱領域形成部６に深
さ８mm、幅８mmの環状溝７を機械加工により形成した。
（３） 図５に示すように、純度９９．７％以上の純Ａ
ｌよりなる直径８mmの線状添加材８を、環状溝７に嵌込
んで耐熱領域形成部６に付設した。
（４） 図６に示すように、鋳造体５を電子ビーム加熱
溶融装置に設置し、次いで添加材８と共に耐熱領域形成
部６を深さ約１２mm、幅約１２mmに亘って溶融し、この
局所溶融合金化処理によって耐熱領域形成部６に純Ａｌ
を合金化させた。Next, the piston P 1 (outer diameter 120
mm) will be described. (1) As shown in FIG. 3, an AI alloy cast body 5 for a piston was cast using a JIS AC8A material. This cast body 5 does not include the top combustion chamber 1 and the ring groove 4,
These are formed by machining in a later process. (2) As shown in FIG. 4, in the cast body 5, an annular groove 7 having a depth of 8 mm and a width of 8 mm was formed in the heat-resistant region forming portion 6 corresponding to the opening peripheral region of the top combustion chamber 1 by machining. (3) As shown in FIG. 5, pure A having a purity of 99.7% or more
The linear additive 8 having a diameter of 8 mm and having a diameter of 1 was fitted in the annular groove 7 and attached to the heat-resistant region forming portion 6. (4) As shown in FIG. 6, the cast body 5 is placed in an electron beam heating and melting apparatus, and then the heat resistant region forming portion 6 is melted together with the additive material 8 over a depth of about 12 mm and a width of about 12 mm, and this local Pure Al is formed on the heat-resistant region forming portion 6 by the melt alloying treatment.
Was alloyed.
【００２４】前記鋳造体５に熱処理を施した後、切削等
の機械加工を施して耐熱領域２を含む頂部燃焼室１およ
び各リング溝４を形成し、図１，図２に示すピストンＰ
1 を製造した。このピストンＰ1 においては、純Ａｌの
合金化に起因して耐熱領域２の合金元素量が主領域３の
合金元素量よりも、表１に示すように少なくなる。After heat-treating the cast body 5, machining such as cutting is performed to form the top combustion chamber 1 and the ring grooves 4 including the heat-resistant region 2, and the piston P shown in FIGS. 1 and 2 is formed.
Manufactured 1 . In this piston P 1 , the amount of alloying elements in the heat-resistant region 2 becomes smaller than that in the main region 3 as shown in Table 1 due to the alloying of pure Al.
【００２５】前記機械加工において、耐熱領域２と主領
域３とはＡｌ材より構成されているので、両領域２，３
間に加工性の差異は殆どなく、したがって加工性は良好
である。In the above machining, the heat resistant region 2 and the main region 3 are made of an Al material, so both regions 2 and 3 are formed.
There is almost no difference in workability between them, and thus workability is good.
【００２６】なお、本発明は、ディーゼル機関以外の内
燃機関におけるピストンにも適用することが可能であ
る。The present invention can also be applied to pistons in internal combustion engines other than diesel engines.
【００２７】[0027]
【発明の効果】請求項１記載の発明によれば、高強度な
耐熱領域を備え、軽量で、耐熱領域および主領域間が一
体化され、省資源化および低コスト化を達成された、設
計自由度の大きなピストンを提供することができる。According to the first aspect of the present invention, a design having a high-strength heat-resistant region, being lightweight, integrating the heat-resistant region and the main region, and achieving resource saving and cost reduction is achieved. A piston having a large degree of freedom can be provided.
【００２８】請求項２記載の発明によれば、鋳造、局所
溶融合金化処理、機械加工といった比較的単純な各工程
を経て前記ピストンを容易に量産することが可能であ
る。According to the second aspect of the present invention, the piston can be easily mass-produced through relatively simple steps such as casting, local melting alloying treatment, and machining.
【図１】ピストンの平面図である。FIG. 1 is a plan view of a piston.
【図２】図１の２−２線で切断したピストンの縦断側面
図である。FIG. 2 is a vertical sectional side view of the piston taken along the line 2-2 in FIG.
【図３】鋳造後における鋳造体の縦断側面図である。FIG. 3 is a vertical sectional side view of a cast body after casting.
【図４】環状溝を形成された鋳造体の縦断側面図であ
る。FIG. 4 is a vertical sectional side view of a cast body having an annular groove formed therein.
【図５】環状溝に線状添加材を嵌込んだ鋳造体の縦断側
面図である。FIG. 5 is a vertical sectional side view of a cast body in which a linear additive is fitted in an annular groove.
【図６】局所溶融合金化処理を施された鋳造体の縦断側
面図である。FIG. 6 is a vertical cross-sectional side view of a cast body that has been subjected to local melting alloying treatment.
２ 耐熱領域 ３ 主領域 ５ 鋳造体 ６ 耐熱領域形成部 ８ 添加材 2 Heat resistant area 3 main areas 5 cast bodies 6 Heat-resistant area forming part 8 additive materials
Claims (2)
耐熱領域（２）と、その耐熱領域（２）に連なる主領域
（３）とを備えたＡｌ合金製ピストンにおいて、前記耐
熱領域（２）は、その合金元素量が前記主領域（３）の
合金元素量よりも少なくなるように、局所溶融合金化処
理によって純Ａｌを合金化させて形成されていることを
特徴とする内燃機関用Ａｌ合金製ピストン。1. An Al alloy piston comprising a heat-resistant region (2) that is subjected to high-temperature thermal shock during operation of an internal combustion engine and a main region (3) connected to the heat-resistant region (2), wherein the heat-resistant region ( The internal combustion engine 2) is formed by alloying pure Al by a local melting alloying treatment so that the amount of the alloying elements is smaller than that of the main region (3). Al alloy piston for use.
耐熱領域（２）と、その耐熱領域（２）に連なる主領域
（３）とを備えたＡｌ合金製ピストンを製造するに当
り、前記主領域（３）と同一組成を有するピストン用Ａ
ｌ合金製鋳造体（５）の耐熱領域形成部（６）に純Ａｌ
よりなる添加材（８）を付設し、次いで前記耐熱領域形
成部（６）に局所溶融合金化処理を施すことによって純
Ａｌを合金化させ、その後前記耐熱領域形成部（６）に
機械加工を施すことによって前記耐熱領域（２）を形成
することを特徴とする内燃機関用Ａｌ合金製ピストンの
製造方法。2. When manufacturing an Al alloy piston having a heat-resistant region (2) that is subjected to high-temperature thermal shock during operation of an internal combustion engine, and a main region (3) connected to the heat-resistant region (2), A for piston having the same composition as the main region (3)
Pure Al in the heat-resistant region forming part (6) of the cast alloy (5)
Is added to the heat-resistant region forming part (6), and then the heat-resistant region forming part (6) is locally melt-alloyed to alloy pure Al, and then the heat-resistant region forming part (6) is machined. A method for manufacturing an Al alloy piston for an internal combustion engine, characterized in that the heat resistant region (2) is formed by applying the piston.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3008507A JPH051622A (en) | 1991-01-28 | 1991-01-28 | Al alloy piston for internal combustion engine and its manufacture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3008507A JPH051622A (en) | 1991-01-28 | 1991-01-28 | Al alloy piston for internal combustion engine and its manufacture |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH051622A true JPH051622A (en) | 1993-01-08 |
Family
ID=11695040
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3008507A Pending JPH051622A (en) | 1991-01-28 | 1991-01-28 | Al alloy piston for internal combustion engine and its manufacture |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH051622A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4963038A (en) * | 1988-09-29 | 1990-10-16 | Nippon Seiko Kabushiki Kaisha | Linear guide apparatus with protector |
| DE10029810A1 (en) * | 2000-06-16 | 2001-12-20 | Mahle Gmbh | Piston for diesel engine; has steel base with combustion mould and has thermal sprayed NiCrAl, CoCrAl or FeCrAl alloy coating, which is thicker at mould edge |
| WO2007012373A1 (en) * | 2005-07-26 | 2007-02-01 | Federal-Mogul Nürnberg GmbH | Method of producing a piston for an internal combustion engine and piston for an internal combustion engine |
| WO2013144072A1 (en) * | 2012-03-28 | 2013-10-03 | Mahle International Gmbh | Method for producing an aluminum piston |
-
1991
- 1991-01-28 JP JP3008507A patent/JPH051622A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4963038A (en) * | 1988-09-29 | 1990-10-16 | Nippon Seiko Kabushiki Kaisha | Linear guide apparatus with protector |
| DE10029810A1 (en) * | 2000-06-16 | 2001-12-20 | Mahle Gmbh | Piston for diesel engine; has steel base with combustion mould and has thermal sprayed NiCrAl, CoCrAl or FeCrAl alloy coating, which is thicker at mould edge |
| US6877473B2 (en) | 2000-06-16 | 2005-04-12 | Mahle Gmbh | Diesel engine piston |
| WO2007012373A1 (en) * | 2005-07-26 | 2007-02-01 | Federal-Mogul Nürnberg GmbH | Method of producing a piston for an internal combustion engine and piston for an internal combustion engine |
| WO2013144072A1 (en) * | 2012-03-28 | 2013-10-03 | Mahle International Gmbh | Method for producing an aluminum piston |
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