JP2005097743A - Powder for repairing die-casting die, and method of repairing die-casting die using the same - Google Patents

Powder for repairing die-casting die, and method of repairing die-casting die using the same Download PDF

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JP2005097743A
JP2005097743A JP2004249388A JP2004249388A JP2005097743A JP 2005097743 A JP2005097743 A JP 2005097743A JP 2004249388 A JP2004249388 A JP 2004249388A JP 2004249388 A JP2004249388 A JP 2004249388A JP 2005097743 A JP2005097743 A JP 2005097743A
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powder
die
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heat
resistant alloy
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JP4170273B2 (en
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Naoji Yamamoto
直司 山本
Masato Hasuike
正人 蓮池
Tetsuya Kondo
鉄也 近藤
Takashi Ofuji
孝 大藤
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Honda Motor Co Ltd
Daido Steel Co Ltd
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Daido Steel Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide powder for repairing a die-casting die capable of performing the surface modification of a die-casting die and the secure repair of its damaged part, and further capable of obtaining a repaired part or the like excellent in durability such as heat check resistance and erosion resistance. <P>SOLUTION: The powder for repairing a die-casting die is alloy powder composed of at least one kind of carbide selected from NbC, VC and WC by ≤10 wt.% in total, and the balance Ni-Cr-Mo based heat resistant alloy or a powdery mixture of the powder of the above carbide with a particle diameter of ≤15 μm by ≤10 wt.%, and the balance powder of the above Ni based heat resistant alloy. The Ni-Cr-Mo based heat resistant alloy comprises 10 to 30 wt.% Cr, ≤10 wt.% Mo, ≤3 wt.% Fe, and Nb and Ta by 3 to 4 wt.% in total, and the balance Ni. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、アルミニウム合金などのダイカスト鋳造に用いられるダイカスト金型の表面改質および損傷部分の補修をするためのダイカスト金型補修用粉末およびこれを用いたダイカスト金型の補修方法に関する。   The present invention relates to a die-casting die repair powder for surface modification of a die-casting die used for die-casting such as an aluminum alloy and repairing a damaged portion, and a die-casting die repair method using the same.

ダイカスト金型は、アルミニウム合金の溶湯を高圧でそのキャビティ中に繰り返し充填されるため、係るキャビティの湯口付近の一部が損傷(ヒートチェック、アルミニウム溶損、欠けなど)することがある。
係る損傷部分を補修するため、硬質金属や耐熱合金からなる溶接棒を用いるTIG溶接が行われている。しかし、TIG溶接は、ワイヤ加工できる金属や合金に限定されるため、耐熱性および高硬度を求められる上記損傷部分の補修には不向きで、且つ損傷部分の位置によっては溶接できないこともあった。
ところで、金型などの補修に用いる溶接用超硬合金が提案されている。これは、総含有量が25〜45wt%のCoおよび/またはNiからなる結合材中に粒径0.3〜3μmのWC微粉末を均一に分散させている(例えば、特許文献1参照)。
Since die casting molds are repeatedly filled with molten aluminum alloy at a high pressure in the cavity, a part of the cavity near the gate may be damaged (heat check, aluminum melting, chipping, etc.).
In order to repair such a damaged portion, TIG welding using a welding rod made of a hard metal or a heat-resistant alloy is performed. However, since TIG welding is limited to metals and alloys that can be wire-processed, TIG welding is not suitable for repairing the above-mentioned damaged part that requires heat resistance and high hardness, and depending on the position of the damaged part, welding may not be possible.
By the way, a cemented carbide for welding used for repairing a mold or the like has been proposed. In this method, WC fine powder having a particle size of 0.3 to 3 μm is uniformly dispersed in a binder composed of Co and / or Ni having a total content of 25 to 45 wt% (see, for example, Patent Document 1).

特開平7−126792号公報 (第1〜6頁)JP 7-126792 A (pages 1 to 6)

しかしながら、前記溶接用超硬合金では、WC微粉末が全重量の過半数以上を占めているため、高硬度および高耐磨耗性が得られる反面、繰り返し高温度に加熱されるダイカスト金型のキャビティ付近の補修に用いた場合、熱応力による割れ(ヒートチェック)を生じ易く、耐久性に劣る、という問題があった。しかも、CoやNiとWC微粉末との燒結体を、純Ni溶接棒を用いて溶接するため、補修すべき損傷部分の位置によっては溶接できない、という問題もあった。
また、金型などの耐磨耗性を向上させるため、係る金型などの表面に粉体プラズマアーク溶接にて形成した溶接肉盛部を有する合金複合部材も提案されている(例えば、特許文献2参照)。
However, in the cemented carbide for welding, WC fine powder accounts for more than a majority of the total weight, so that high hardness and high wear resistance can be obtained, but the cavity of the die casting mold that is repeatedly heated to a high temperature. When used in the repair of the vicinity, there was a problem that cracking due to thermal stress (heat check) was likely to occur and the durability was poor. Moreover, since a sintered body of Co or Ni and WC fine powder is welded using a pure Ni welding rod, there is also a problem that welding cannot be performed depending on the position of a damaged portion to be repaired.
Further, in order to improve the wear resistance of a mold or the like, an alloy composite member having a weld overlay formed on the surface of the mold or the like by powder plasma arc welding has also been proposed (for example, Patent Documents). 2).

特開平8−267276号公報 (第1〜6頁、図1)JP-A-8-267276 (pages 1-6, FIG. 1)

前記合金複合部材の溶接肉盛部は、Co基またはNi基合金の金属生地中に面積率で80〜98%の炭化物(NbC、CrC)を分散させている。係る溶接肉盛部を得るため、Co基またはNi基合金の粉末に30〜55wt%のNbCおよびCrCの少なくとも一方の炭化物を添加した複合粉末を用意し、これを金型などの表面に粉体プラズマアーク溶接するものである。しかし、係る溶接肉盛部は、上記炭化物の量が多いため、例えばダイスにおけるポンチの進入孔の周縁に肉盛して、耐磨耗性を高めることはできるが、ダイカスト金型のキャビティ付近の補修に用いた場合、熱応力による割れを生じ易い、という問題があった。   In the weld overlay of the alloy composite member, carbide (NbC, CrC) having an area ratio of 80 to 98% is dispersed in a Co-based or Ni-based alloy metal cloth. In order to obtain such a weld overlay, a composite powder in which at least one carbide of NbC and CrC of 30 to 55 wt% is added to a Co-based or Ni-based alloy powder is prepared on the surface of a mold or the like. Plasma arc welding is performed. However, since the weld build-up part has a large amount of the carbide, for example, it can be built up on the peripheral edge of the punch entry hole in the die to improve the wear resistance, but it is near the cavity of the die-cast mold. When used for repair, there was a problem that cracking due to thermal stress was likely to occur.

本発明は、前述した背景技術における問題点を解決し、ダイカスト金型の表面改質や損傷部分などを確実に補修できると共に、耐ヒートチェック性や耐溶損性などの耐久性に優れた補修部などを得ることができるダイカスト金型補修用粉末およびこれを用いたダイカスト金型の補修方法を提供する、ことを課題とする。   The present invention solves the problems in the background art described above, and can reliably repair the surface modification or damaged portion of the die casting mold, and also has a repair portion excellent in durability such as heat check resistance and melt resistance. It is an object of the present invention to provide a die-casting die repair powder capable of obtaining the above and a die-casting die repair method using the same.

本発明は、上記課題を解決するため、炭化物の量および粉径を抑制し、且つ所定のNi基耐熱合金との合金粉末または混合粉末にする、ことに着想して成されたものである。
即ち、本発明のダイカスト金型補修用粉末(請求項1)は、NbC、VC、およびWCの少なくとも1種以上からなり総計で10wt%以下の炭化物と残部がNi−Cr−Mo系耐熱合金とからなる合金粉末、あるいは、粉径15μm以下の上記炭化物の粉末:10wt%以下と、残部:上記Ni−Cr−Mo系耐熱合金の粉末と、の混合粉末である、ことを特徴とする。
In order to solve the above-mentioned problems, the present invention has been conceived with the aim of suppressing the amount and powder diameter of carbides and making an alloy powder or a mixed powder with a predetermined Ni-base heat-resistant alloy.
That is, the powder for repairing a die-casting die of the present invention (Claim 1) is composed of at least one of NbC, VC, and WC and a total of 10 wt% or less of carbide and the balance being Ni—Cr—Mo heat-resistant alloy. Or a mixed powder of the carbide powder having a powder diameter of 15 μm or less: 10 wt% or less and the balance: the Ni—Cr—Mo heat-resistant alloy powder.

また、前記Ni−Cr−Mo系耐熱合金は、Co:13wt%以下と、W:5wt%以下とを含む、ダイカスト金型補修用粉末(請求項2)も本発明に含まれる。
上記CoおよびWの添加理由を説明する。
Co:13wt%以下、Coは、高温強度を高めるため添加するが、13wt%を越えると脆性化を招くため、これ以下とした。その下限は、0.1wt%である。
W:5wt%以下、Wも、高温強度を高めるために添加するが、5t%を越えると脆性化を招くため、これ以下としたもので、その下限は、0.1wt%である。
In addition, the Ni—Cr—Mo heat-resistant alloy includes a powder for repairing a die-casting die containing Co: 13 wt% or less and W: 5 wt% or less (Claim 2).
The reason for adding Co and W will be described.
Co: 13 wt% or less, Co is added to increase the high-temperature strength. However, if it exceeds 13 wt%, brittleness is caused, so the content is made less than this. The lower limit is 0.1 wt%.
W: 5 wt% or less, W is also added to increase the high-temperature strength, but if it exceeds 5 t%, brittleness is caused. Therefore, the lower limit is set to 0.1 wt%.

更に、前記Ni−Cr−Mo系耐熱合金は、Cr:10〜30wt%、Mo:10wt%以下、Fe:3wt%以下、NbおよびTaの合計:3〜4wt%、および残部Niである、ダイカスト金型補修用粉末(請求項3)も本発明に含まれる。
ここで、上記Ni−Cr−Mo系耐熱合金の各元素の添加理由を説明する。
Cr:10〜30wt%、Crは、耐熱性および耐酸化性を高めるために添加され、係る効果を得るために10wt%以上添加するが、30wt%を越えると、固溶せず析出し始めるため、これ以下とした。
Mo:10wt%以下、Moは、高温強度および耐食性を高めるために添加するが、10wt%を越えると、係る効果が飽和するため、これ以下とした。尚、その下限値は、約0.1wt%である。
Fe:3wt%以下、Feは、不純物として不可避的に入るが、3wt%を越えると、耐食性が低下するため、これ以下とした。
NbおよびTaの合計:3〜4wt%、NbおよびTaは、結晶粒界強化のために添加され、係る効果を得るために3wt%以上添加するが、4wt%を越えると脆性化を招くため、これ以下とした。尚、その下限値は、約0.05wt%である。
Further, the Ni—Cr—Mo heat-resistant alloy is a die casting in which Cr: 10 to 30 wt%, Mo: 10 wt% or less, Fe: 3 wt% or less, Nb and Ta total: 3 to 4 wt%, and the balance Ni Mold repair powder (Claim 3) is also included in the present invention.
Here, the reason for adding each element of the Ni—Cr—Mo heat-resistant alloy will be described.
Cr: 10 to 30 wt%, Cr is added to enhance heat resistance and oxidation resistance. To obtain such effects, 10 wt% or more is added, but if it exceeds 30 wt%, it begins to precipitate without solid solution. This is less than this.
Mo: 10 wt% or less, Mo is added to increase the high-temperature strength and corrosion resistance, but if it exceeds 10 wt%, the effect is saturated. The lower limit is about 0.1 wt%.
Fe: 3 wt% or less, Fe inevitably enters as an impurity, but if it exceeds 3 wt%, the corrosion resistance deteriorates, so the content was made less than this.
Total of Nb and Ta: 3 to 4 wt%, Nb and Ta are added for strengthening grain boundaries, and 3 wt% or more is added to obtain such an effect, but if it exceeds 4 wt%, brittleness is caused. Less than this. The lower limit is about 0.05 wt%.

加えて、前記Ni−Cr−Mo系耐熱合金は、Si:0.5wt%以下、Mn:0.3wt%以下、C:0.10wt%以下、S:0.01wt%以下、Al:3.0wt%以下、およびTi:3.5wt%以下を更に含む、ダイカスト金型補修用粉末(請求項4)も本発明に含まれる。
上記Ni−Cr−Mo系耐熱合金の各元素の添加理由を説明する。
Si:0.5wt%以下、Siは、脱酸作用を得るために添加するが、0.5wt%を越えると、脆性化を招くため、これ以下とした。
Mn:0.3wt%以下、Mnも、脱酸作用を得るために添加するが、0.3wt%を越えると、肉盛り溶接時に酸化を招くため、これ以下とした。
C:0.10wt%以下、Cは、結晶粒界強化のために添加するが、0.10wt%を越えると、脆性化を招くため、これ以下とした。
S:0.01wt%以下、Sは、不純物として不可避的に入るが、0.01wt%を越えると、粒界に析出して脆くするため、これ以下とした。
Al:3.0wt%以下、Alは、Ni(Al,Ti)の分散強化のため添加するが、3.0wt%を越えると脆性化するため、これ以下とした(下限値は0.01wt%)。
Ti:3.5wt%以下、Tiも、Ni(Al,Ti)の分散強化のため添加するが、3.5wt%を越えると脆性化するため、これ以下とした(下限値は0.01wt%)。
In addition, the Ni—Cr—Mo heat-resistant alloy has Si: 0.5 wt% or less, Mn: 0.3 wt% or less, C: 0.10 wt% or less, S: 0.01 wt% or less, Al: 3. Die-casting mold repair powder (Claim 4) further containing 0 wt% or less and Ti: 3.5 wt% or less is also included in the present invention.
The reason for adding each element of the Ni—Cr—Mo heat resistant alloy will be described.
Si: 0.5 wt% or less, Si is added to obtain a deoxidizing action. However, if it exceeds 0.5 wt%, brittleness is caused, so the content is made less than this.
Mn: 0.3 wt% or less, Mn is also added to obtain a deoxidizing action. However, if it exceeds 0.3 wt%, oxidation is caused at the time of build-up welding.
C: 0.10 wt% or less, C is added for strengthening the grain boundaries. However, if it exceeds 0.10 wt%, brittleness is caused, so the content is made less than this.
S: 0.01 wt% or less, S inevitably enters as an impurity, but if it exceeds 0.01 wt%, it precipitates at the grain boundary and becomes brittle, so it was set below this.
Al: 3.0 wt% or less, Al is added for dispersion strengthening of Ni 3 (Al, Ti), but when it exceeds 3.0 wt%, it becomes brittle. %).
Ti: 3.5 wt% or less, Ti is also added for dispersion strengthening of Ni 3 (Al, Ti). However, when it exceeds 3.5 wt%, it becomes brittle, so that the lower limit is set to 0.01 wt%. %).

一方、本発明におけるダイカスト金型の補修方法(請求項5)は、NbC、VC、およびWCの少なくとも1種以上からなり総計で10wt%以下の炭化物と残部がNi−Cr−Mo系耐熱合金とからなる合金粉末、あるいは、粉径15μm以下の上記炭化物の粉末:10wt%以下と、残部:上記Ni−Cr−Mo系耐熱合金の粉末と、の混合粉末であるダイカスト金型補修用粉末を用い、係るダイカスト金型補修用粉末を溶接トーチに送給するステップと、送給された前記ダイカスト金型補修用粉末をプラズマアークにより溶解しつつダイカスト金型の欠け部または表面に対して肉盛溶接するステップと、を含む、ことを特徴とする。
尚、上記Ni−Cr−Mo系耐熱合金に、Co:13wt%以下と、W:5wt%以下とを含むもの、または、Cr:10〜30wt%、Mo:10wt%以下、Fe:3wt%以下、NbおよびTaの合計:3〜4wt%、および残部Niであるもの、あるいは、Si:0.5wt%以下、Mn:0.3wt%以下、C:0.10wt%以下、S:0.01wt%以下、Al:3.0wt%以下、およびTi:3.5wt%以下を更に含むものを用いた、ダイカスト金型の補修方法も本発明に含めることが可能である。
On the other hand, the die casting mold repair method according to the present invention (Claim 5) comprises at least one of NbC, VC, and WC and a total of 10 wt% or less of carbide and the balance being Ni—Cr—Mo heat resistant alloy Or a powder for repairing a die-casting die, which is a mixed powder of the powder of the carbide having a powder diameter of 15 μm or less: 10 wt% or less and the balance: the powder of the Ni—Cr—Mo heat-resistant alloy. A step of feeding the die casting mold repair powder to the welding torch, and overlay welding to the chipped portion or the surface of the die casting mold while melting the fed die casting mold repair powder by a plasma arc. And a step of performing.
The Ni—Cr—Mo heat-resistant alloy contains Co: 13 wt% or less and W: 5 wt% or less, or Cr: 10-30 wt%, Mo: 10 wt% or less, Fe: 3 wt% or less , Nb and Ta total: 3 to 4 wt%, and the balance being Ni, or Si: 0.5 wt% or less, Mn: 0.3 wt% or less, C: 0.10 wt% or less, S: 0.01 wt It is also possible to include in the present invention a method for repairing a die-casting die using a material further including:% or less, Al: 3.0% by weight or less, and Ti: 3.5% by weight or less.

前記ダイカスト金型補修用粉末(請求項1)によれば、前記前記Ni−Cr−Mo系耐熱合金の生地中に比較的少量の上記炭化物がほぼ均一に分布していため、硬さが過大に上がらず、靭性および耐熱性が向上する。このため、アルミニウム合金の溶湯を繰り返しダイカスト鋳造しても、これに伴うヒートチェック(割れ)や溶損を確実に低減することが可能となる。
また、前記ダイカスト金型補修用粉末(請求項2〜4)によれば、上記効果を一層確実に発揮せしめることができる。
更に、前記ダイカスト金型の補修方法(請求項5)によれば、ダイカスト金型の表面改質や損傷部分などを確実に補修できると共に、耐ヒートチェック性や耐溶損性などの耐久性に優れた補修部などを得ることができる。
According to the die-casting mold repair powder (Claim 1), since a relatively small amount of the carbide is distributed almost uniformly in the Ni-Cr-Mo heat-resistant alloy dough, the hardness is excessive. The toughness and heat resistance are improved. For this reason, even if the aluminum alloy melt is repeatedly die-cast, it is possible to reliably reduce the heat check (cracking) and melting loss associated therewith.
Moreover, according to the said die-cast metal mold | die repair powder (Claims 2-4), the said effect can be exhibited more reliably.
Furthermore, according to the repair method of the die casting mold (Claim 5), it is possible to reliably repair the surface modification or damaged portion of the die casting mold, and it is excellent in durability such as heat check resistance and melt resistance. You can get a repair department.

予め、NbC、VC、およびWCの少なくとも1種以上からなり総計で10wt%以下の炭化物と残部がNi−Cr−Mo系耐熱合金とからなる合金粉末を、公知のアトマイズ法により作製する。
あるいは、それぞれ個別に作製した粉径15μm以下で且つ総計が10wt%以下の上記炭化物からなる粉末と、上記Ni−Cr−Mo系耐熱合金の粉末とを、公知のブレンダにより均一に混合した混合粉末を作製する。
次いで、図1に示すように、ダイカスト金型Kにおいて、アルミニウム合金の溶湯を繰り返しダイカスト鋳造して溶損したキャビティに連通する湯口付近の欠け部に対し、図1に示す溶接トーチTを用いてプラズマアーク溶接による粉末肉盛溶接を行う。尚、ダイカスト金型Kには、例えばシリンダブロック用やクランクケース用などがある。
In advance, an alloy powder made of at least one of NbC, VC and WC and consisting of a total of 10 wt% or less of carbide and the balance of Ni—Cr—Mo heat-resistant alloy is prepared by a known atomizing method.
Alternatively, a mixed powder obtained by uniformly mixing, with a known blender, a powder made of the above carbide having a powder diameter of 15 μm or less and a total of 10 wt% or less, and a powder of the Ni—Cr—Mo heat-resistant alloy, which are individually produced. Is made.
Next, as shown in FIG. 1, in the die-casting die K, the weld torch T shown in FIG. Powder overlay welding is performed by plasma arc welding. The die casting mold K includes, for example, a cylinder block and a crankcase.

図1に示すように、上記溶接トーチTは、その中心部のタングステン電極1と内筒3との間にプラズマアークPの流路2が環状に形成され、且つ内筒3と外筒5との間に前記粉末pまたは混合粉末pとキャリアガスとの流路4が環状に形成されている。また、外筒5の外周寄りには、Arなどのシールドガスの流路6が環状に形成されている。尚、図1に示すように、タングステン電極1とダイカスト金型Kとには、主電源9が導通している。
上記溶接トーチTの流路4には、前記合金粉末pまたは混合粉末pがホッパHから搬送管7を経て送給され(送給するステップ)、キャリアガスとの混合物8となり、溶接トーチTの先端で中心部のプラズマアークPにより溶解されつつ当該溶接トーチTから上記欠け部に肉盛り溶接Wされる(肉盛溶接するステップ)。
尚、上記混合粉末pを用いる場合、2つのホッパHに予め個別に貯留した前記炭化物の粉末と前記合金粉末pとを、途中で合流させてから上記溶接トーチTに送給するようにしても良い。
As shown in FIG. 1, the welding torch T has a plasma arc P flow path 2 formed annularly between a tungsten electrode 1 and an inner cylinder 3 at the center thereof, and an inner cylinder 3 and an outer cylinder 5. Between, the flow path 4 of the said powder p or mixed powder p, and carrier gas is formed in cyclic | annular form. Further, a shield gas flow path 6 such as Ar is formed in an annular shape near the outer periphery of the outer cylinder 5. As shown in FIG. 1, a main power supply 9 is electrically connected to the tungsten electrode 1 and the die casting mold K.
In the flow path 4 of the welding torch T, the alloy powder p or the mixed powder p is fed from the hopper H through the transport pipe 7 (feeding step) to become a mixture 8 with the carrier gas, and the welding torch T Overlay welding W is performed from the welding torch T to the chipped portion while being melted by the plasma arc P in the center at the tip (step of overlay welding).
When the mixed powder p is used, the carbide powder and the alloy powder p, which are individually stored in two hoppers H in advance, are joined on the way and then fed to the welding torch T. good.

高温の上記プラズマアークPにより溶解された前記合金粉末pまたは混合粉末pが前記欠け部に肉盛り溶接されると、Ni−Cr−Mo系耐熱合金からなる生地とその中にほぼ均一に分散したNbC、VC、およびWCの少なくとも1種または2種以上の炭化物とからなる溶接肉盛り部Wが形成される。
係る溶接肉盛り部Wは、Ni−Cr−Mo系耐熱合金の生地中に比較的少量の上記炭化物がほぼ均一に分布していため、硬さが過大に上がらないと共に、靭性および耐熱性が向上する。このため、アルミニウム合金の溶湯を繰り返しダイカスト鋳造しても、これに伴うヒートチェック(割れ)や溶損を確実に低減することが可能となる。尚、上記溶接肉盛り部は、その外周面を適宜研削しても良い。
When the alloy powder p or the mixed powder p melted by the high temperature plasma arc P is welded to the chipped portion, the Ni-Cr-Mo heat-resistant alloy material and the material powder are almost uniformly dispersed therein. A weld overlay W composed of at least one or two or more carbides of NbC, VC, and WC is formed.
The weld build-up part W has a relatively small amount of the carbides distributed almost uniformly in the Ni-Cr-Mo heat-resistant alloy material, so that the hardness does not increase excessively and the toughness and heat resistance are improved. To do. For this reason, even if the aluminum alloy melt is repeatedly die-cast, it is possible to reliably reduce the heat check (cracking) and melting loss associated therewith. In addition, you may grind the outer peripheral surface of the said weld buildup part suitably.

表1に示すように、実施例1〜6用のNi−Cr−Mo系耐熱合金(INCONEL625相当)、実施例7用のNi−Cr−Mo−Co−W系耐熱合金、比較例1のFe−Cr−Mo系工具鋼(SKD61相当)、および比較例2のFe−Ni−Co−Mo系強力高合金鋼からなる平均粒径150μmの合金粉末を、それぞれ個別にガスアトマイズによって製造した。
実施例1〜7用のNi−Cr−Mo系耐熱合金などの合金粉末に対し、表1に示す粉径10μm以下の炭化物を表1の重量でそれぞれ混合することにより、実施例1〜7の混合粉末を得た。
As shown in Table 1, the Ni—Cr—Mo heat resistant alloy for Examples 1 to 6 (corresponding to INCONEL 625), the Ni—Cr—Mo—Co—W heat resistant alloy for Example 7, and the Fe of Comparative Example 1 -Cr-Mo type tool steel (equivalent to SKD61) and alloy powders having an average particle size of 150 μm made of the Fe—Ni—Co—Mo type high strength alloy steel of Comparative Example 2 were individually produced by gas atomization.
For the alloy powders such as Ni—Cr—Mo heat-resistant alloys for Examples 1 to 7, carbides having a powder diameter of 10 μm or less shown in Table 1 are mixed with the weights shown in Table 1, respectively. A mixed powder was obtained.

Figure 2005097743
Figure 2005097743

次に、各例の混合粉末または合金粉末から、公知のプラズマアーク溶接トーチを用いて、直径15mm×厚み5mmの試験片を作製した。各例の試験片の外周に対し、高周波加熱(700℃×4秒)および水冷(常温×3秒)を交互に1000回繰り返すことにより、熱応力によるヒートチェックを生成させた。
そして、各例の試験片を観察し、発生したヒートチェックの総長さ、平均長さなどを測定し、それらの結果を表2および図2〜5のグラフに示した。また、各例の肉盛溶接部の硬度および溶損(面積)率も測定し、表2に示した。
Next, a test piece having a diameter of 15 mm and a thickness of 5 mm was prepared from the mixed powder or alloy powder of each example using a known plasma arc welding torch. A heat check by thermal stress was generated by alternately repeating high-frequency heating (700 ° C. × 4 seconds) and water cooling (room temperature × 3 seconds) 1000 times on the outer periphery of the test piece of each example.
And the test piece of each example was observed, the total length of the heat check which generate | occur | produced, average length, etc. were measured, and those results were shown in the graph of Table 2 and FIGS. In addition, the hardness and melting loss (area) rate of the weld overlay in each example were also measured and shown in Table 2.

Figure 2005097743
Figure 2005097743

表2および図2〜5のグラフによれば、実施例1〜7では、ヒートチェックの最大長さ(μm):58〜90、総数:138〜304、発生頻度(Σn/cm):約30〜65となり、ヒートチェックの総数と発生頻度では比較例1,2の間に入ったが、最大長さは比較例1,2よりも明らかに短くなった。これは、実施例1〜7では、それなりの頻度と数でヒートチェックが発生するが、その平均長さでも分かるように、微細なものが多く、ダイカスト金型の耐久性(寿命)を高められることが理解できる。   According to the graph of Table 2 and FIGS. 2-5, in Examples 1-7, the maximum length (micrometer) of a heat check: 58-90, the total number: 138-304, occurrence frequency ((SIGMA) n / cm): About 30 The total number of heat checks and the frequency of occurrence fell between Comparative Examples 1 and 2, but the maximum length was clearly shorter than Comparative Examples 1 and 2. In Examples 1 to 7, heat check occurs at a reasonable frequency and number, but as can be seen from the average length, there are many fine ones, and the durability (life) of the die casting mold can be improved. I understand that.

また、表2によれば、実施例1〜7では、硬さ(HRC):約12〜34、溶損率:4.2〜7.1%であったの対し、比較例1,2はこれらよりも更に硬く且つ更に多く溶損していた。これは、実施例1〜7の肉盛溶接部には、生成する炭化物が比較的少ないため、硬度が下がると共に、耐熱性および靭性を有するため、高圧で鋳込まれるアルミニウム合金の溶湯による溶損に対し、十分に耐えたことが理解される。
以上のような実施例1〜7の結果によって、本発明の作用が理解され且つ効果が裏付けられた。
尚、本発明は、その趣旨を逸脱しない範囲で適宜変更することが可能である。
例えば、前記合金粉末または混合粉末は、水アトマイズ法や鋳塊を粉砕する方法にって作製したり、更に分級を加えて作製しても良い。
また、ダイカスト金型の表面改質についても、本発明の補修用粉末を適用することが可能である。
Moreover, according to Table 2, in Examples 1-7, hardness (HRC): About 12-34 and melt | dissolution rate: 4.2-7.1% was compared with Comparative Examples 1 and 2. It was harder and more melted than these. This is because the build-up welds of Examples 1 to 7 have a relatively small amount of carbide to be produced, so that the hardness is lowered and the heat resistance and toughness are obtained. However, it is understood that it fully endured.
From the results of Examples 1 to 7 as described above, the operation of the present invention was understood and the effect was supported.
In addition, this invention can be suitably changed in the range which does not deviate from the meaning.
For example, the alloy powder or mixed powder may be produced by a water atomization method or a method of pulverizing an ingot, or may be produced by further classification.
Also, the repair powder of the present invention can be applied to the surface modification of a die casting mold.

本発明の補修方法を示す概略図。Schematic which shows the repair method of this invention. 実施例および比較例のヒートチェックの総長さを示すグラフ。The graph which shows the total length of the heat check of an Example and a comparative example. 実施例および比較例のヒートチェックの平均長さを示すグラフ。The graph which shows the average length of the heat check of an Example and a comparative example. 実施例および比較例のヒートチェックの最大長さを示すグラフ。The graph which shows the maximum length of the heat check of an Example and a comparative example. 実施例および比較例のヒートチェックの発生頻度を示すグラフ。The graph which shows the occurrence frequency of the heat check of an Example and a comparative example.

符号の説明Explanation of symbols

p…合金粉末/混合粉末
K…ダイカスト金型
T…溶接トーチ
P…プラズマアーク
p ... Alloy powder / mixed powder K ... Die casting mold T ... Welding torch P ... Plasma arc

Claims (5)

NbC、VC、およびWCの少なくとも1種以上からなり総計で10wt%以下の炭化物と残部がNi−Cr−Mo系耐熱合金とからなる合金粉末、
あるいは、粉径15μm以下の上記炭化物の粉末:10wt%以下と、残部:上記Ni−Cr−Mo系耐熱合金の粉末と、の混合粉末である、
ことを特徴とするダイカスト金型補修用粉末。
An alloy powder comprising at least one of NbC, VC, and WC, and a total of 10 wt% or less of carbide and the balance being a Ni—Cr—Mo heat resistant alloy;
Or the powder of the said carbide | carbonized_material of 15 micrometers or less: It is a mixed powder of 10 wt% or less, and remainder: The said powder of the said Ni-Cr-Mo type heat-resistant alloy,
A powder for repairing die-casting molds.
前記Ni−Cr−Mo系耐熱合金は、Co:13wt%以下と、W:5wt%以下とを含む、ことを特徴とする請求項1に記載のダイカスト金型補修用粉末。   The die-casting mold repair powder according to claim 1, wherein the Ni-Cr-Mo heat-resistant alloy contains Co: 13 wt% or less and W: 5 wt% or less. 前記Ni−Cr−Mo系耐熱合金は、Cr:10〜30wt%、Mo:10wt%以下、Fe:3wt%以下、NbおよびTaの合計:3〜4wt%、および残部Niである、ことを特徴とする請求項1に記載のダイカスト金型補修用粉末。   The Ni—Cr—Mo heat-resistant alloy is Cr: 10-30 wt%, Mo: 10 wt% or less, Fe: 3 wt% or less, the total of Nb and Ta: 3-4 wt%, and the balance Ni The powder for die-casting die repair of Claim 1. 前記Ni−Cr−Mo系耐熱合金は、Si:0.5wt%以下、Mn:0.3wt%以下、C:0.10wt%以下、S:0.01wt%以下、Al:3.0wt%以下、およびTi:3.5wt%以下を更に含む、
ことを特徴とする請求項2または3に記載のダイカスト金型補修用粉末。
The Ni—Cr—Mo heat-resistant alloy has Si: 0.5 wt% or less, Mn: 0.3 wt% or less, C: 0.10 wt% or less, S: 0.01 wt% or less, Al: 3.0 wt% or less And Ti: further containing 3.5 wt% or less,
The powder for die-casting die repair of Claim 2 or 3 characterized by the above-mentioned.
NbC、VC、およびWCの少なくとも1種以上からなり総計で10wt%以下の炭化物と残部がNi−Cr−Mo系耐熱合金とからなる合金粉末、あるいは、粉径15μm以下の上記炭化物の粉末:10wt%以下と、残部:上記Ni−Cr−Mo系耐熱合金の粉末と、の混合粉末であるダイカスト金型補修用粉末を用い、
上記ダイカスト金型補修用粉末を溶接トーチに送給するステップと、
送給された上記ダイカスト金型補修用粉末をプラズマアークにより溶解しつつダイカスト金型の欠け部または表面に対して肉盛溶接するステップと、を含む、
ことを特徴とするダイカスト金型の補修方法。
Alloy powder consisting of at least one of NbC, VC and WC and a total of 10 wt% or less of carbide and the balance of Ni—Cr—Mo heat-resistant alloy, or the above-mentioned carbide powder having a powder diameter of 15 μm or less: 10 wt %, And the balance: the powder of the Ni—Cr—Mo heat-resistant alloy, and a die-casting mold repair powder, which is a mixed powder,
Feeding the die-casting die repair powder to a welding torch;
Including overlay welding to the chipped portion or surface of the die-casting mold while melting the supplied powder for repairing the die-casting mold with a plasma arc,
A method for repairing a die-casting mold characterized by that.
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WO2006129608A1 (en) * 2005-06-01 2006-12-07 Honda Motor Co., Ltd. Die reinforcing method and die repairing method
US7927653B2 (en) 2005-12-16 2011-04-19 Honda Motor Co., Ltd. Metal mold repair method and metal mold repair paste agent
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WO2006129608A1 (en) * 2005-06-01 2006-12-07 Honda Motor Co., Ltd. Die reinforcing method and die repairing method
US8337639B2 (en) 2005-06-01 2012-12-25 Honda Motor Co., Ltd. Die reinforcing method and die repairing method
US7927653B2 (en) 2005-12-16 2011-04-19 Honda Motor Co., Ltd. Metal mold repair method and metal mold repair paste agent
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WO2015019603A1 (en) * 2013-08-07 2015-02-12 日鉄住金ハード株式会社 Buildup welding material, straightening roll, guide roll, transporting roll, and anvil
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JP5859175B2 (en) * 2013-08-07 2016-02-10 日鉄住金ハード株式会社 Welding material for overlaying, straightening roll, guide roll, transport roll and anvil
JPWO2015019603A1 (en) * 2013-08-07 2017-03-02 日鉄住金ハード株式会社 Welding material for overlaying, straightening roll, guide roll, transport roll and anvil
US10112254B2 (en) 2014-08-21 2018-10-30 Huntington Alloys Corporation Method for making clad metal pipe
CN114182139A (en) * 2021-12-10 2022-03-15 西北工业大学 Precipitation strengthening nickel-based high-temperature alloy and preparation method thereof

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