JP4204650B2 - High strength heat-resistant zinc alloy and molded product - Google Patents
High strength heat-resistant zinc alloy and molded product Download PDFInfo
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- JP4204650B2 JP4204650B2 JP32822096A JP32822096A JP4204650B2 JP 4204650 B2 JP4204650 B2 JP 4204650B2 JP 32822096 A JP32822096 A JP 32822096A JP 32822096 A JP32822096 A JP 32822096A JP 4204650 B2 JP4204650 B2 JP 4204650B2
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Description
【０００１】
【発明の属する技術分野】
本発明は高強度耐熱亜鉛合金及びコールドチャンバーダイカスト、チキソキャスト又は射出成形により成形された成形品に関し、より詳しくはコールドチャンバーダイカスト、チキソキャスト又は射出成形に用いる、高温下に於ける抗張力及び耐クリープ性に優れた亜鉛合金及びこれを用いてコールドチャンバーダイカスト、チキソキャスト又は射出成形により成形された成形品に関する。
【０００２】
【従来の技術】
亜鉛合金は装飾品を中心にして多くの用途の成形品に用いられてきている。それに加えて、最近、亜鉛合金のダイカスト、射出成形等のコストの有利性に着目して、耐熱性を必要とする一部の成形品にも亜鉛合金を活用しようという動きがあり、それで高温下に於ける抗張力に優れた亜鉛合金が求められている。
【０００３】
また、汎用として用いられている亜鉛合金であるＪＩＳ ＺＤＣ２種は高温下に於けるクリープ強度が劣るため熱に曝される状態では使用できず、また、クリープに起因するボルトのゆるみの問題が生じるため、使用範囲が限定されるという課題がある。
【０００４】
【発明が解決しようとする課題】
本発明は、このような従来技術の有する要求、課題に鑑みてなされたものであり、コールドチャンバーダイカスト、チキソキャスト又は射出成形に用いる、高温下に於ける抗張力及び耐クリープ性に優れた新規な亜鉛合金及びこれを用いてコールドチャンバーダイカスト、チキソキャスト又は射出成形により成形された成形品を提供することを目的とする。
【０００５】
【課題を解決するための手段】
本発明者らは、上記の目的を達成するために種々検討を重ねた結果、亜鉛合金においてマグネシウムを１〜４．５質量％含有させることにより、コールドチャンバーダイカスト、チキソキャスト又は射出成形に用いる、高温下に於いて優れた抗張力及び耐クリープ性を有する亜鉛合金が得られることを見出し、本発明を完成した。
【０００６】
即ち、本発明のコールドチャンバーダイカスト、チキソキャスト又は射出成形に用いる 、高温下に於ける抗張力及び耐クリープ性に優れた亜鉛合金は、マグネシウムを１〜４．５質量％含有し、残部が亜鉛と不可避の不純物からなることを特徴とする。
【０００７】
本発明の亜鉛合金は、所望により、
（ａ）銅、ニッケル及びマンガンの少なくとも１種を合計で７質量％以下、及び
（ｂ）チタン、ジルコニウム、クロム、コバルト、リチウム、ベリリウム、ケイ素及びランタン系元素からなる群から選ばれた少なくとも１種を合計で２質量％以下
からなる群から選ばれた何れか一群又は二群を追加含有することができる。
また、本発明の成形品は、上記した亜鉛合金からコールドチャンバーダイカスト、チキソキャスト又は射出成形により成形されたことを特徴とする。
【０００８】
【発明の実施の形態】
本発明の亜鉛合金においては、マグネシウムは高温下に於ける抗張力及び耐クリープ性を向上させる。マグネシウムを１質量％以上添加することにより、金属間化合物（Ｍｇ2 Ｚｎ11）が樹枝状に均一に晶出し、この樹枝状の金属間化合物が亜鉛合金の耐熱性を向上させる。しかしながら、マグネシウムの添加量が４．５質量％を越えると亜鉛合金は脆化する傾向がある。従って、本発明の亜鉛合金においてはマグネシウムの含有量を１〜４．５質量％、望ましくは１〜３質量％とする。
【０００９】
本発明の亜鉛合金においては、所望により銅、ニッケル及びマンガンの少なくとも１種を添加して亜鉛合金の機械的強度を強化させることができる。しかし、銅、ニッケル及びマンガンの少なくとも１種を合計で７質量％を超えて添加すると亜鉛合金が脆化する傾向がある。従って、本発明の亜鉛合金において銅、ニッケル及び／又はマンガンを添加する場合には、それらの少なくとも１種を合計で７質量％以下、望ましくは３質量％以下添加する。
【００１０】
本発明の亜鉛合金においては、所望によりチタン、ジルコニウム、クロム、コバルト、リチウム、ベリリウム、ケイ素及びランタン系元素からなる群から選ばれた少なくとも１種を添加して亜鉛合金の機械的強度を改善することができる。しかし、それらの添加量が合計で２質量％を超えると衝撃値が低下するのでそれらの元素からなる群から選ばれた少なくとも１種の元素の添加量は合計で２質量％以下に限定される。
【００１１】
本発明の亜鉛合金は、コールドチャンバーダイカスト、チキソキャスト及び射出成形に特に適している。
【００１２】
本明細書において、「チキソキャスト法」とは、特公平２−１５６２０号公報に記載されているような射出成形機のシリンダー内で原料亜鉛合金の半溶融状態を実現し、スクリューによる剪断力でチキソトロピーを発現させて成形する方法を意味し、又「射出成形法」とは、チキソキャスト法と同様であるが、原料亜鉛合金の溶融温度直上の温度に加熱して溶融状態で鋳造する方法を意味する。
【００１３】
【実施例】
以下に、実施例等に基づいて本発明を具体的に説明する。
実施例１〜１６及び比較例１〜５
黒鉛坩堝中にベースとしての電気亜鉛及び所要量のＭｇ、Ｃｕ、Ｎｉ、Ｍｎ、Ｔｉ、Ｚｒ、Ｃｒ、Ｃｏ、Ｌｉ、Ｂｅ、Ｓｉ、Ｌａ、Ｍｍ（ミッシュメタル）を添加した。Ｃｕ、Ｎｉ、Ｍｎ、Ｔｉ、Ｚｒ、Ｃｒ、Ｃｏ、Ｌａ、Ｍｍは母合金の形で装入し、Ｍｇ、Ｌｉ、Ｂｅ、Ｓｉは直接添加で装入し、それらを溶解させて、表１及び表２に示す合金成分を表１及び表２に示す量（質量％）で含有し、残部が亜鉛と不可避の不純物からなる亜鉛合金を調製した。それらの亜鉛合金から、コールドチャンバーダイカスト、射出成形又はチキソキャストにより、下記の成形条件下で、長さ２３０ｍｍ、平行部直径６ｍｍφの引張試験片、及び長さ１５０ｍｍ、平行部直径８ｍｍφのクリープ試験片を作製した。
【００１４】
成形条件：
コールドチャンバーダイカスト： 溶湯温度４７０〜５５０℃、型温度１５０℃、型締力３５ｔｏｎ 、アキュームレーター圧力７０ｋｇｆ／ｃｍ2 。
射出成形： 溶湯温度＝液相線温度＋１０℃（合金により異なるがほぼ４００℃）、型温度１５０℃、型締力５０ｔｏｎ、射出圧力１９９０ｋｇｆ／ｃｍ2 、スクリュー回転数２２０ｒｐｍ。
チキソキャスト： 溶湯温度＝液相線温度−１０℃（合金により異なるがほぼ３８０℃）、型温度１５０℃、型締力５０ｔｏｎ 、射出圧力１９９０ｋｇｆ／ｃｍ2 、スクリュー回転数２２０rpm 。
【００１５】
これらの試験片を用いて以下の試験を実施した。
引張試験： インストロン引張試験機による。条件：標点間距離５０ｍｍ、平行部直径６ｍｍφ、引張速度１０ｍｍ／ｍｉｎ、試験温度１００℃。
クリープ試験： 単軸クリープ試験機による。条件：標点間距離５０ｍｍ、平行部直径８ｍｍφ、試験温度１００℃、試験荷重２５ＭＰａ、１００時間後。
【００１６】
測定結果は表１及び表２に示す通りであった。なお、表１及び表２中の成形方法の欄中において、ＣＣＤＣはコールドチャンバーダイカストの略記であり、ＴＣはチキソキャストの略記である。
【００１７】
【表１】
【表２】
表１及び表２のデータから明らかなように、本発明の亜鉛合金である実施例１〜１６の亜鉛合金は、既存の亜鉛合金である比較例１のＩＬＺＲＯ１４の亜鉛合金と比較して、試験温度１００℃に於ける抗張力が高い値を示しており、クリープ歪も少ない。
【００２０】
一方、本発明の亜鉛合金の組成範囲から外れているＭｇ含有量が極めて少ない比較例３の亜鉛合金は抗張力及びクリープ特性の両方が既存の亜鉛合金よりも劣っており、また、Ｍｇ含有量が少ない比較例２の亜鉛合金は抗張力及びクリープ特性の両方が既存の亜鉛合金より少し改善されているに過ぎない。また、比較例４及び５の亜鉛合金の場合には鋳造性が悪く健全な鋳物が得られなかった。
【００２１】
【発明の効果】
以上に説明したように、本発明の高強度耐熱亜鉛合金はコールドチャンバーダイカスト、チキソキャスト及び射出成形に特に適しており、高温下に於ける抗張力及び耐クリープ性に優れており、亜鉛合金成形品の用途を大幅に広げるものである。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a high-strength heat-resistant zinc alloy and a molded article formed by cold chamber die casting, thixocasting or injection molding , and more particularly, tensile strength and creep resistance at high temperatures used for cold chamber die casting, thixocasting or injection molding. The present invention relates to a zinc alloy having excellent properties and a molded product formed by cold chamber die casting, thixocasting or injection molding using the same .
[0002]
[Prior art]
Zinc alloys have been used in molded articles for many uses, mainly for decorative products. In addition, recently, there has been a movement to use zinc alloys for some molded products that require heat resistance, focusing on the cost advantages of zinc alloy die casting, injection molding, etc. There is a need for zinc alloys with excellent tensile strength.
[0003]
In addition, JIS ZDC type 2, which is a zinc alloy used as a general purpose, cannot be used in the state of being exposed to heat because of its poor creep strength at high temperatures, and the problem of loosening of bolts caused by creep occurs. Therefore, there is a problem that the range of use is limited.
[0004]
[Problems to be solved by the invention]
The present invention has been made in view of such requirements and problems of the prior art, and is used for cold chamber die casting, thixocasting or injection molding, and is a novel material excellent in tensile strength and creep resistance at high temperatures. It is an object of the present invention to provide a zinc alloy and a molded product formed by cold chamber die casting, thixocasting or injection molding using the zinc alloy.
[0005]
[Means for Solving the Problems]
As a result of repeated studies to achieve the above object, the present inventors have used magnesium in a zinc alloy in an amount of 1 to 4.5 % by mass , so that it can be used for cold chamber die casting, thixocasting , or injection molding. The inventors have found that a zinc alloy having excellent tensile strength and creep resistance can be obtained at high temperatures, and have completed the present invention.
[0006]
That is, cold chamber die casting of the present invention, used in the thixotropic casting or injection molding, excellent zinc alloy in tensile strength and creep resistance to high temperatures, magnesium containing 1 to 4.5% by weight, and the balance zinc It consists of inevitable impurities.
[0007]
The zinc alloy of the present invention is optionally
(A) a total of at least one of copper, nickel and manganese is 7 % by mass or less , and
(B) titanium, zirconium, chromium, cobalt, lithium, beryllium, silicon, and any group or two selected from the group consisting of 2 wt% or less of at least one selected from the group consisting of lanthanide in a total Additional groups can be included.
The molded product of the present invention is characterized by being molded from the above-described zinc alloy by cold chamber die casting, thixocasting or injection molding .
[0008]
DETAILED DESCRIPTION OF THE INVENTION
In the zinc alloy of the present invention, magnesium improves the tensile strength and creep resistance at high temperatures. By adding 1% by mass or more of magnesium, the intermetallic compound (Mg 2 Zn 11 ) is crystallized uniformly in a dendritic shape, and this dendritic intermetallic compound improves the heat resistance of the zinc alloy. However, when the added amount of magnesium exceeds 4.5 % by mass , the zinc alloy tends to become brittle. Therefore, in the zinc alloy of the present invention, the magnesium content is 1 to 4.5 % by mass , preferably 1 to 3 % by mass .
[0009]
In the zinc alloy of the present invention, if desired, at least one of copper, nickel and manganese can be added to enhance the mechanical strength of the zinc alloy. However, when at least one of copper, nickel and manganese is added in excess of 7 % by mass , the zinc alloy tends to become brittle. Therefore, when adding copper, nickel and / or manganese to the zinc alloy of the present invention, at least one of them is added in a total of 7 % by mass or less, desirably 3 % by mass or less.
[0010]
In the zinc alloy of the present invention, the mechanical strength of the zinc alloy is improved by adding at least one selected from the group consisting of titanium, zirconium, chromium, cobalt, lithium, beryllium, silicon and lanthanum elements as desired. be able to. However, since the impact value decreases when the total amount of these elements exceeds 2 % by mass, the total amount of at least one element selected from the group consisting of these elements is limited to 2 % by mass or less. .
[0011]
Zinc alloy of the present invention, cold chamber die casting, that is particularly suitable for thixotropic casting and injection molding.
[0012]
In this specification, the “thixocast method” means that a semi-molten state of a raw material zinc alloy is realized in a cylinder of an injection molding machine as described in Japanese Patent Publication No. 2-15620, and a shearing force by a screw is used. This means a method of forming with thixotropy, and the “injection molding method” is the same as the thixocast method, but it is a method of casting in the molten state by heating to a temperature just above the melting temperature of the raw material zinc alloy. means.
[0013]
【Example】
Hereinafter, the present invention will be specifically described based on examples and the like.
Examples 1 to 16 and Comparative Examples 1 to 5
Mg of electrolytic zinc and requirements as a base in a graphite crucible, was added Cu, Ni, Mn, T i , Zr, Cr, Co, Li, Be, Si, La, Mm the (misch metal). C u, Ni, Mn, Ti , Zr, Cr, Co, La, Mm is charged in the form of a mother alloy, Mg, L i, Be, Si is charged with direct addition, by dissolving them, A zinc alloy containing the alloy components shown in Tables 1 and 2 in the amounts ( mass% ) shown in Tables 1 and 2 and the balance consisting of zinc and inevitable impurities was prepared. These zinc alloy or al, co chromatography Cold chamber die casting, injection molding or thixotropic casting, a molded under the following conditions, length 230 mm, a tensile test piece parallel portion diameter diameter: 6 mm, and length 150 mm, parallel part diameter 8mmφ A creep specimen was prepared.
[0014]
Molding condition:
Co over Cold chamber die-casting: melt temperature 470-550 ° C., mold temperature 0.99 ° C., the mold clamping force of 35 ton, accumulator pressure 70 kgf / cm 2.
Injection molding: Molten metal temperature = liquidus temperature + 10 ° C. (depending on the alloy, almost 400 ° C.), mold temperature 150 ° C., mold clamping force 50 ton, injection pressure 1990 kgf / cm 2 , screw rotation speed 220 rpm.
Thixocast: Molten metal temperature = liquidus temperature−10 ° C. (depending on the alloy, almost 380 ° C.), mold temperature 150 ° C., mold clamping force 50 ton, injection pressure 1990 kgf / cm 2 , screw rotation speed 220 rpm.
[0015]
The following tests were carried out using these test pieces.
Tensile test: According to Instron tensile tester. Conditions: distance between gauge points 50 mm, parallel part diameter 6 mmφ, tensile speed 10 mm / min, test temperature 100 ° C.
Creep test: Based on a single-axis creep tester. Conditions: Distance between gauge points 50 mm, parallel part diameter 8 mmφ, test temperature 100 ° C., test load 25 MPa, after 100 hours.
[0016]
The measurement results were as shown in Tables 1 and 2. Note that, in the column of the molding method in Table 1 and Table 2, CCDC is an abbreviation for cold chamber die casting, T C is Ru abbreviated Der of thixotropic casting.
[0017]
[Table 1]
[Table 2]
As is clear from the data in Tables 1 and 2, the zinc alloys of Examples 1 to 16 which are the zinc alloys of the present invention are compared with the zinc alloy of ILZRO14 of Comparative Example 1 which is an existing zinc alloy. The tensile strength at a test temperature of 100 ° C. is high, and the creep strain is small.
[0020]
On the other hand, zinc alloys Mg content is extremely small in Comparative Example 3 which is outside the composition range of the zinc alloy of the present invention are inferior to both the existing zinc alloy anti-tension and creep properties, also, the Mg content The zinc alloy of Comparative Example 2 with a small amount of both has only a slight improvement in both tensile strength and creep properties over the existing zinc alloy . In addition, in the case of the zinc alloys of Comparative Examples 4 and 5, the castability was poor and a sound casting could not be obtained .
[0021]
【The invention's effect】
As described above, the high-strength heat-resistant zinc alloy of the present invention is particularly suitable for cold chamber die casting, thixocasting and injection molding, and is excellent in tensile strength and creep resistance at high temperatures. This greatly expands the use of.
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32822096A JP4204650B2 (en) | 1996-12-09 | 1996-12-09 | High strength heat-resistant zinc alloy and molded product |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32822096A JP4204650B2 (en) | 1996-12-09 | 1996-12-09 | High strength heat-resistant zinc alloy and molded product |
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| Publication Number | Publication Date |
|---|---|
| JPH10168533A JPH10168533A (en) | 1998-06-23 |
| JP4204650B2 true JP4204650B2 (en) | 2009-01-07 |
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| JP32822096A Expired - Fee Related JP4204650B2 (en) | 1996-12-09 | 1996-12-09 | High strength heat-resistant zinc alloy and molded product |
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1996
- 1996-12-09 JP JP32822096A patent/JP4204650B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111607718A (en) * | 2020-05-28 | 2020-09-01 | 宁波市佳利来机械制造有限公司 | Zinc alloy casting and preparation method thereof |
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