JP2003213400A - Member for diecasting machine and production method therefor - Google Patents
Member for diecasting machine and production method thereforInfo
- Publication number
- JP2003213400A JP2003213400A JP2002321715A JP2002321715A JP2003213400A JP 2003213400 A JP2003213400 A JP 2003213400A JP 2002321715 A JP2002321715 A JP 2002321715A JP 2002321715 A JP2002321715 A JP 2002321715A JP 2003213400 A JP2003213400 A JP 2003213400A
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- Prior art keywords
- die casting
- chromium
- casting machine
- surface layer
- layer portion
- Prior art date
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- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、アルミニウムまた
はマグネシウム用のダイカストマシンにおいて、金属溶
湯と接触する部分、即ち、入れ子、中子、押出ピン及び
鋳抜きピン等を含む金型部材や、押出用スリーブ並びに
プランジャチップ等に使用されるダイカストマシン用部
材に係る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a die casting machine for aluminum or magnesium, a portion which comes into contact with molten metal, that is, a die member including a nest, a core, an extrusion pin, a casting pin, etc. The present invention relates to members for die casting machines used for sleeves, plunger chips and the like.
【０００２】[0002]
【従来の技術】従来より、ダイカストマシンの金型には
ＳＫＤ６１（ＪＩＳ）などの合金工具鋼が広く使用され
ている。Ａｌ溶湯は活性が非常に高いので、それに接触
する部材はＡｌとの反応によって容易に溶損される。ま
た、ダイカスト用の素材として使用されるＭｇ合金中に
もＡｌが含まれているので、その溶湯に接触する部材も
同様に溶損される。2. Description of the Related Art Conventionally, alloy tool steel such as SKD61 (JIS) has been widely used for a die of a die casting machine. Since the Al molten metal has a very high activity, the member contacting it is easily melted by the reaction with Al. Further, since Al is also contained in the Mg alloy used as the material for die casting, the member that comes into contact with the molten metal is also melted and damaged.
【０００３】金属溶湯との接触による溶損の防止を目的
として、ダイカストマシン用部材の表面に窒化処理など
の表面処理を施すことが一般的に行われている。For the purpose of preventing melting damage due to contact with molten metal, surface treatment such as nitriding treatment is generally performed on the surface of the die casting machine member.
【０００４】鋼製の部材の表面に窒化処理を施すと、表
層部においてＦｅ素地の中にＦｅ−Ｎ化合物が形成され
る。このＦｅ−Ｎ化合物は溶融Ａｌと反応しにくいの
で、部材の耐溶損性が向上する。しかし、Ｆｅ−Ｎ化合
物は、その分解温度が比較的低いことから、使用中に分
解が徐々に進行し、ＦｅとＡｌの間で反応が起こるよう
になる。このため、従来の窒化処理のみでは十分な耐溶
損性を実現することが困難である。When the surface of a steel member is subjected to a nitriding treatment, an Fe-N compound is formed in the Fe matrix in the surface layer portion. Since this Fe-N compound does not easily react with molten Al, the corrosion resistance of the member is improved. However, since the Fe-N compound has a relatively low decomposition temperature, decomposition gradually progresses during use and a reaction occurs between Fe and Al. For this reason, it is difficult to realize sufficient melting loss resistance only by the conventional nitriding treatment.
【０００５】また、窒化処理した後に、クロムを拡散さ
せてクロム窒化物及びクロム炭化物からなる表層部を形
成する方法も提案されている。この表層部は耐溶損性を
有しているが、先に窒化処理を行った場合には、上記表
層部を厚くすることができず、表層部を形成した後に、
比較的大きな加工代を有する機械加工が必要な金型等に
は適さず、その改善が望まれていた。Further, a method has been proposed in which, after nitriding treatment, chromium is diffused to form a surface layer portion made of chromium nitride and chromium carbide. Although this surface layer portion has corrosion resistance, when the nitriding treatment is performed first, the surface layer portion cannot be thickened, and after the surface layer portion is formed,
It is not suitable for dies and the like that require machining with a relatively large machining allowance, and its improvement has been desired.
【０００６】また、機械加工をせずに使用できる部分に
おいても、表層部が薄いために使用中の僅かな摩耗や割
れによってもＡｌ溶湯が基材まで達してしまい、その箇
所を起点として一気に溶損が進行してしまうので、効果
を発揮できる環境が限定される。Further, even in a portion which can be used without machining, the Al molten metal reaches the base material even if it is slightly worn or cracked during use because the surface layer portion is thin, and the molten aluminum melts from that portion as a starting point. As the loss progresses, the environment in which the effect can be exerted is limited.
【０００７】その他、ＰＶＤ処理によって各種窒化物や
炭化物の薄膜を形成したものも一部で採用されている
が、膜の剥離やピンホールなどの欠陥があると、そこか
ら溶損が始まるので寿命が安定せず、余り使用されてい
ないのが現状である。[0007] In addition, some thin films of various nitrides and carbides formed by PVD treatment are also used, but if there is a defect such as peeling of the film or pinhole, melting loss starts from there, so that the life is shortened. Is not stable and is rarely used.
【０００８】[0008]
【発明が解決しようとする課題】本発明は、以上のよう
な従来のダイカストマシン用部材についての問題点に鑑
み成されたものであり、本発明の目的は、耐溶損性に優
れたダイカストマシン用部材を提供することにある。ま
た、本発明の目的は、耐溶損性に優れた表層部をより厚
く形成することができるとともに剥離などの問題もな
く、表層部の形成後に機械加工して上記ダイカストマシ
ン用部材を製造可能な同部材の製造方法を提供すること
にある。SUMMARY OF THE INVENTION The present invention has been made in view of the problems of the conventional members for a die casting machine as described above, and an object of the present invention is to provide a die casting machine excellent in erosion resistance. To provide a member for use. Further, an object of the present invention is that it is possible to form the surface layer portion excellent in melting resistance to be thicker and there is no problem such as peeling, and the die casting machine member can be manufactured by machining after forming the surface layer portion. It is to provide a manufacturing method of the member.
【０００９】[0009]
【課題を解決するための手段】本発明のダイカストマシ
ン用部材は、鋼製の母材の表面に、窒化クロムが分散し
た表層部が形成されていることを特徴とする。The member for a die casting machine of the present invention is characterized in that a surface layer portion in which chromium nitride is dispersed is formed on the surface of a steel base material.
【００１０】鋼製の母材の表面から、クロムと窒素を同
時にまたはこの順序で逐次的に拡散させると、３０μｍ
以上の深さに渡って表層部にＣｒＮ，Ｃｒ２Ｎなどのク
ロム窒化物が分散された層が形成され、その表層部の厚
さは１００μｍ以上とすることも可能である。そこで、
この表層部を形成後に機械加工してもこの表層部を十分
に残すことが可能となる。これらのクロム窒化物は、Ａ
ｌ溶湯に対する耐溶損性に優れているとともに、分解温
度が高いのでダイカストの際の使用温度では分解せず、
安定性に優れている。When chromium and nitrogen are diffused simultaneously or sequentially in this order from the surface of the steel base material, it becomes 30 μm.
A layer in which chromium nitrides such as CrN and Cr 2 N are dispersed is formed in the surface layer portion over the above depth, and the thickness of the surface layer portion can be 100 μm or more. Therefore,
Even if the surface layer portion is machined after being formed, the surface layer portion can be sufficiently left. These chromium nitrides are
l It has excellent erosion resistance against molten metal and has a high decomposition temperature, so it will not decompose at the operating temperature during die casting,
It has excellent stability.
【００１１】なお、上記のダイカストマシン用部材にお
いて、鋼製の母材の表面に、窒化クロムとともに窒化鉄
が混在して分散していても良い。In the above member for die casting machine, iron nitride may be mixed and dispersed together with chromium nitride on the surface of the steel base material.
【００１２】好ましくは、クロム及び窒素の濃度が、表
面から傾斜的に変化するように前記表層部を形成する。Preferably, the surface layer portion is formed so that the concentrations of chromium and nitrogen change from the surface in an inclined manner.
【００１３】表面からクロム及び窒素を拡散させてクロ
ム窒化物を形成すると、クロム及び窒素の濃度は、表面
が最も高く内部に行くに従って次第に低くなる。このよ
うな場合、急激な組織の変化がないので、表層部が剥離
するおそれがない。When chromium and nitrogen are diffused from the surface to form a chromium nitride, the concentration of chromium and nitrogen is highest at the surface and becomes gradually lower toward the inside. In such a case, since there is no rapid change in the structure, there is no risk of peeling off the surface layer portion.
【００１４】好ましくは、前記表層部の表面におけるク
ロム濃度を２０ｗｔ％以上とする。Preferably, the chromium concentration on the surface of the surface layer portion is 20 wt% or more.
【００１５】表面のクロム濃度が低くなると、クロム窒
化物の分散密度が小さくなるので、耐溶損性に与える効
果が減少する。従って、表面のクロム濃度として２０ｗ
ｔ％程度を確保することが好ましい。また、クロム濃度
の上限としては４５ｗｔ％以下が好ましい。クロム濃度
が４５ｗｔ％を超えると、非常に脆い鉄とクロムの金属
間化合物が形成される可能性があり、靭性が著しく低下
するおそれがある。When the chromium concentration on the surface becomes low, the dispersion density of chromium nitride becomes small, so that the effect on the corrosion resistance decreases. Therefore, the surface chromium concentration is 20w
It is preferable to secure about t%. The upper limit of the chromium concentration is preferably 45 wt% or less. If the chromium concentration exceeds 45 wt%, a very brittle iron-chromium intermetallic compound may be formed, and the toughness may be significantly reduced.
【００１６】好ましくは、前記母材を構成する鋼の炭素
組成を０．２ｗｔ％以下とする。[0016] Preferably, the carbon composition of the steel constituting the base material is 0.2 wt% or less.
【００１７】母材中のＣ量が０．２ｗｔ％以上の場合に
は、母材中のＣとＣｒが反応して、表面に緻密な炭化物
層が形成される。この炭化物層は、厚さが４０μｍ以下
と薄く、Ｃｒの拡散時に生じる母材の熱変形を補正する
ための加工代が確保できないので、寸法公差の小さな部
品を加工することが困難である。Ｃ量が０．２ｗｔ％以
下の場合には、１００μｍ以上の厚さの拡散層が形成さ
れ、Ｆｅ基固溶体に窒化物が分散しているので靱性もあ
り、機械加工で容易に所定寸法に仕上げることができ
る。また、表層部を厚くできるので、多少の摩耗や割れ
が発生してもＡｌ溶湯が母材に到達せず、過酷な使用環
境でも安定して効果を発揮できる。When the amount of C in the base material is 0.2 wt% or more, C and Cr in the base material react with each other to form a dense carbide layer on the surface. This carbide layer has a thin thickness of 40 μm or less, and a machining allowance for correcting the thermal deformation of the base material that occurs when Cr diffuses cannot be secured, so that it is difficult to machine a component having a small dimensional tolerance. When the amount of C is 0.2 wt% or less, a diffusion layer having a thickness of 100 μm or more is formed, and the nitride is dispersed in the Fe-based solid solution so that it has toughness and is easily machined to a predetermined size. be able to. Further, since the surface layer portion can be thickened, the molten aluminum does not reach the base material even if some wear or crack occurs, and the effect can be stably exhibited even in a harsh usage environment.
【００１８】なお、上記のクロムの代りに、チタンを用
いることもできる。Note that titanium may be used instead of the above chromium.
【００１９】鋼製の母材の表面から、チタンと窒素を同
時にまたはこの順序で逐次的に拡散させると、上記クロ
ムと窒素の場合と同様に、表層部にＴｉＮ，Ｔｉ２Ｎな
どのチタン窒化物が分散された状態で形成される。これ
らのチタン窒化物は、先に挙げたクロム窒化物と同様
に、Ａｌ溶湯に対する耐溶損性に優れているとともに、
分解温度が高いのでダイカストの際の使用温度では分解
せず、安定性にも優れている。When titanium and nitrogen are simultaneously or sequentially diffused from the surface of the steel base material, titanium nitride such as TiN, Ti 2 N, etc. is formed on the surface layer portion as in the case of chromium and nitrogen. The object is formed in a dispersed state. These titanium nitrides, like the chromium nitrides mentioned above, have excellent erosion resistance to molten Al, and
Since the decomposition temperature is high, it does not decompose at the operating temperature during die casting and is excellent in stability.
【００２０】なお、上記のダイカストマシン用部材にお
いて、鋼製の母材の表面に、窒化チタンとともに窒化鉄
が混在して分散していても良い。In the above die casting machine member, iron nitride may be mixed and dispersed together with titanium nitride on the surface of the steel base material.
【００２１】好ましくは、チタン及び窒素の濃度が、表
面から傾斜的に変化するように前記表層部を形成する。[0021] Preferably, the surface layer portion is formed so that the concentrations of titanium and nitrogen change from the surface in an inclined manner.
【００２２】好ましくは、前記表層部の表面におけるチ
タン濃度を１０ｗｔ％以上とする。また、チタン濃度の
上限は、クロムの場合と同様な理由から３０ｗｔ％以下
が好ましい。Preferably, the titanium concentration on the surface of the surface layer portion is 10 wt% or more. Further, the upper limit of the titanium concentration is preferably 30 wt% or less for the same reason as in the case of chromium.
【００２３】好ましくは、前記母材を構成する鋼の炭素
組成を０．２ｗｔ％以下とする。Preferably, the carbon composition of the steel constituting the base material is 0.2 wt% or less.
【００２４】[0024]
【発明の実施の形態】ダイカストマシン用の鋳抜きピン
（φ２０×１５０）を、次の手順で作製した：
（ａ）ＳＵＳ６３０（ＪＩＳ）の素材に粗加工を施し、
母材を作製する；
（ｂ）母材にＣｒ合金粉末（またはＴｉ合金粉末）を接
触させた状態で加熱して、母材の表層部にＣｒ（または
Ｔｉ）を拡散させる；
（ｃ）表面の仕上げ加工を行う；
（ｄ）ガス窒化処理を行う；
（ｅ）表面の研磨加工を行う。BEST MODE FOR CARRYING OUT THE INVENTION A casting pin (φ20 × 150) for a die casting machine was produced by the following procedure: (a) A material of SUS630 (JIS) was roughly processed,
(B) Heat the base material in contact with Cr alloy powder (or Ti alloy powder) to diffuse Cr (or Ti) in the surface layer of the base material; (c) Surface (D) Gas nitriding is performed; (e) Surface polishing is performed.
【００２５】図１に、Ｃｒ拡散後ガス窒化処理を行った
供試体（供試体１）の断面の顕微鏡組織写真を示す。Ｃ
ｒは表面から約１００μｍ、Ｎは表面から約１４０μｍ
の深さまで拡散している。FIG. 1 shows a microstructure photograph of a cross section of a specimen (specimen 1) subjected to gas nitriding treatment after Cr diffusion. C
r is about 100 μm from the surface, N is about 140 μm from the surface
Has diffused to the depth of.
【００２６】図２に、上記の供試体の表面のＸ線回折結
果を示す。検出されたピークは、ＣｒＮ、Ｆｅ４Ｎ及び
Ｆｅを示すものである。FIG. 2 shows the X-ray diffraction result of the surface of the above-mentioned specimen. The detected peaks are indicative of CrN, Fe 4 N and Fe.
【００２７】なお、Ｔｉ拡散後ガス窒化処理を行った供
試体（供試体２）では、ＴｉＮ、Ｆｅ４Ｎ及びＦｅを示
すピークが検出された。In the test piece (test piece 2) which was subjected to gas nitriding treatment after diffusion of Ti, peaks showing TiN, Fe 4 N and Fe were detected.
【００２８】上記の手順で作製された二種類の鋳抜きピ
ン（供試体１及び２）をダイカストマシンに組み込ん
で、その寿命について調査した。なお、比較材として、
従来のＳＫＤ６１からなる母材に窒化処理を施したもの
（供試体３）、及びＳＵＳ６３０からなる母材に窒化処
理を施したもの（供試体４）についても、同じ方法でそ
の寿命について調査した。Two types of die-cast pins (specimens 1 and 2) produced by the above procedure were incorporated in a die casting machine, and their lifespan was investigated. As a comparative material,
The same method was used to investigate the life of a conventional base material made of SKD61 that was subjected to a nitriding treatment (specimen 3) and a base material made of SUS630 that was subjected to a nitriding treatment (specimen 4).
【００２９】その結果を表１に示す。The results are shown in Table 1.
【００３０】[0030]
【表１】 [Table 1]
【００３１】表１に示されているように、本発明に基づ
く鋳抜きピン（供試体１及び２）の寿命は、従来品（供
試体３）の８〜１０倍程度であった。As shown in Table 1, the life of the cast pin (specimens 1 and 2) according to the present invention was about 8 to 10 times that of the conventional product (specimen 3).
【００３２】また、ＳＵＳ６３０からなる母材に窒化処
理のみを施したもの（供試体４）は、従来品と比べて寿
命が余り変わらなかった。その理由として、母材のＳＵ
Ｓ６３０中に含まれているＣｒ量のみでは、表層部に形
成されるクロム窒化物の量が十分ではなく、耐溶損性に
及ぼす効果が少ないことが考えられる。In addition, the life of the base material made of SUS630, which was subjected only to the nitriding treatment (specimen 4), was not much different from that of the conventional product. The reason is SU of the base material
It is conceivable that the amount of Cr contained in S630 alone is not sufficient for the amount of chromium nitride formed in the surface layer portion, and has little effect on the corrosion resistance.
【００３３】[0033]
【発明の効果】本発明に基づくダイカストマシン用部材
によれば、金属溶湯と接触する部材の耐溶損性が改善さ
れるので、それらの部材の寿命を増大させることができ
る。更に、それらの部材の寿命が増大する結果、ダイカ
ストマシンの稼働率が上がるとともに、ダイカスト製品
の品質が安定して良品率が向上する。According to the member for a die casting machine according to the present invention, the erosion resistance of the member in contact with the molten metal is improved, so that the service life of these members can be increased. Further, as a result of increasing the life of these members, the operating rate of the die casting machine is increased, and the quality of the die casting product is stabilized, and the non-defective rate is improved.
【図１】供試体１（Ｃｒ拡散後ガス窒化処理）の断面の
顕微鏡組織写真。FIG. 1 is a microstructure photograph of a cross section of a specimen 1 (gas nitriding treatment after Cr diffusion).
【図２】供試体１の表面のＸ線回折結果を示す図。FIG. 2 is a view showing an X-ray diffraction result of the surface of the sample 1.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 藤本 亮輔 静岡県沼津市大岡2068の３ 東芝機械株式 会社内 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Ryosuke Fujimoto 2068 Ooka, Numazu City, Shizuoka Prefecture Toshiba Machine Co., Ltd. In the company
Claims (14)
した表層部が形成されていることを特徴とするダイカス
トマシン用部材。1. A member for a die casting machine characterized in that a surface layer portion in which chromium nitride is dispersed is formed on the surface of a steel base material.
鉄が混在して分散した表層部が形成されていることを特
徴とするダイカストマシン用部材。2. A member for a die casting machine characterized in that a surface layer portion in which chromium nitride and iron nitride are mixed and dispersed is formed on the surface of a steel base material.
に変化することを特徴とする請求項１または２に記載の
ダイカストマシン用部材。3. The member for a die casting machine according to claim 1, wherein the concentrations of chromium and nitrogen change from the surface in an inclined manner.
２０ｗｔ％以上、４５ｗｔ％以下であることを特徴とす
る請求項１または２に記載のダイカストマシン用部材。4. The member for a die casting machine according to claim 1, wherein the chromium concentration on the surface of the surface layer portion is 20 wt% or more and 45 wt% or less.
２ｗｔ％以下であることを特徴とする請求項１または２
に記載のダイカストマシン用部材。5. The carbon composition of the steel constituting the base material is 0.
It is 2 wt% or less, and 1 or 2 characterized by the above-mentioned.
The member for a die casting machine described in.
時にまたはこの順序で逐次的に拡散することによって、
窒化クロムが分散した表層部を形成することを特徴とす
るダイカストマシン用部材の製造方法。6. Chromium and nitrogen are simultaneously or sequentially diffused on the surface of the steel base material in the order mentioned,
A method for manufacturing a member for a die casting machine, which comprises forming a surface layer portion in which chromium nitride is dispersed.
時にまたはこの順序で逐次的に拡散することによって、
窒化クロムと窒化鉄が混在して分散した表層部を形成す
ることを特徴とするダイカストマシン用部材の製造方
法。7. A method of diffusing chromium and nitrogen into the surface of a steel base material simultaneously or sequentially in this order,
A method for manufacturing a member for a die casting machine, which comprises forming a surface layer portion in which chromium nitride and iron nitride are mixed and dispersed.
した表層部が形成されていることを特徴とするダイカス
トマシン用部材。8. A die casting machine member, wherein a surface layer portion in which titanium nitride is dispersed is formed on the surface of a steel base material.
鉄が混在して分散した表層部が形成されていることを特
徴とするダイカストマシン用部材。9. A member for a die casting machine, wherein a surface layer portion in which titanium nitride and iron nitride are mixed and dispersed is formed on the surface of a steel base material.
的に変化することを特徴とする請求項８または９に記載
のダイカストマシン用部材。10. The member for a die casting machine according to claim 8, wherein the concentrations of titanium and nitrogen change from the surface in an inclined manner.
が１０ｗｔ％以上、３０ｗｔ％以下であることを特徴と
する請求項８または９に記載のダイカストマシン用部
材。11. The die casting machine member according to claim 8, wherein the titanium concentration on the surface of the surface layer portion is 10 wt% or more and 30 wt% or less.
０．２ｗｔ％以下であることを特徴とする請求項８また
は９に記載のダイカストマシン用部材。12. The member for a die casting machine according to claim 8, wherein a carbon composition of steel constituting the base material is 0.2 wt% or less.
同時にまたはこの順序で逐次的に拡散することによっ
て、窒化チタンが分散した表層部を形成することを特徴
とするダイカストマシン用部材の製造方法。13. A member for a die casting machine characterized in that a surface layer portion in which titanium nitride is dispersed is formed on a surface of a base material made of steel by simultaneously diffusing titanium and nitrogen or sequentially in this order. Manufacturing method.
同時にまたはこの順序で逐次的に拡散することによっ
て、窒化チタンと窒化鉄が混在して分散した表層部を形
成することを特徴とするダイカストマシン用部材の製造
方法。14. A surface layer portion in which titanium nitride and iron nitride are mixed and dispersed is formed on the surface of a steel base material by simultaneously diffusing titanium and nitrogen or sequentially in this order. And a method for manufacturing a member for a die casting machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002321715A JP2003213400A (en) | 2001-11-12 | 2002-11-05 | Member for diecasting machine and production method therefor |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001-346556 | 2001-11-12 | ||
| JP2001346556 | 2001-11-12 | ||
| JP2002321715A JP2003213400A (en) | 2001-11-12 | 2002-11-05 | Member for diecasting machine and production method therefor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003213400A true JP2003213400A (en) | 2003-07-30 |
Family
ID=27667124
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002321715A Pending JP2003213400A (en) | 2001-11-12 | 2002-11-05 | Member for diecasting machine and production method therefor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2003213400A (en) |
-
2002
- 2002-11-05 JP JP2002321715A patent/JP2003213400A/en active Pending
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