JP2010024545A - Method for producing long-length alloy billet - Google Patents
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この発明は、押出加工等に供される長尺合金ビレットに関するものである。 The present invention relates to a long alloy billet used for extrusion and the like.
合金粉末を加圧成形して押出加工用の合金ビレットを製造する方法は、例えば特開平６−５７３０５号公報（特許文献１）に開示されている。この合金ビレットから押出加工等により所定形状の合金成形体が製造される。一般に、押出加工された押出材の先端部および末端部は分離して廃棄されるので、材料歩留まりの観点からすると、押出材の長さは長い程良い。長い押出材を得るには、合金ビレットの長さを長くするのが良い。 A method for producing an alloy billet for extrusion by pressing an alloy powder is disclosed in, for example, Japanese Patent Application Laid-Open No. 6-57305 (Patent Document 1). An alloy molded body having a predetermined shape is manufactured from the alloy billet by extrusion or the like. In general, since the front end portion and the end portion of the extruded extruded material are separated and discarded, the longer the length of the extruded material, the better from the viewpoint of the material yield. In order to obtain a long extruded material, it is preferable to increase the length of the alloy billet.
長尺の合金ビレットを製造するために、成形用型内に投入する合金原料粉末の量を多くして、押込み型によって加圧圧縮することが考えられる。この場合、押込み型の押込み量が増大し、成形用型の内壁面と合金粉末との摩擦力も増大するので、大きな加圧力が必要になる。押込み型から合金粉末に付与される加圧力は、押込み型の近くに位置する粉末に対しては大きいが、押込み型から遠く離れて位置する粉末に対しては小さくなる。そのため、押込み型から離れている合金粉末には、押込み型の加圧力が十分に伝達されず、最終的に得られる合金ビレット内に大きな密度勾配が発生するおそれがある。 In order to produce a long alloy billet, it is conceivable to increase the amount of the alloy raw material powder to be put into the molding die and to compress and compress it with an indentation die. In this case, the pressing amount of the pressing die increases, and the frictional force between the inner wall surface of the molding die and the alloy powder also increases, so that a large pressing force is required. The pressure applied to the alloy powder from the indentation die is large for the powder located near the indentation die, but is small for the powder located far from the indentation die. For this reason, the pressing force of the pressing die is not sufficiently transmitted to the alloy powder separated from the pressing die, and there is a possibility that a large density gradient is generated in the finally obtained alloy billet.
特開平５−７０８０２号公報（特許文献２）は、加圧成形される合金粉末とパンチとの間の距離を、見かけ上、縮めることを目的として、合金粉末を上下のパンチで抑えて、まず下側パンチを上方に動かして合金粉末を下から加圧し、次いで上側パンチを下方に動かして合金粉末を上から加圧する方法を開示している。この方法によれば、密度勾配の小さい長尺の合金ビレットを得ることができるが、加圧装置の構成が複雑になるという問題が生じる。 Japanese Patent Application Laid-Open No. 5-70802 (Patent Document 2) discloses that the alloy powder is suppressed by upper and lower punches for the purpose of apparently reducing the distance between the pressed alloy powder and the punch. A method is disclosed in which the lower punch is moved upward to pressurize the alloy powder from below, and then the upper punch is moved downward to pressurize the alloy powder from above. According to this method, a long alloy billet having a small density gradient can be obtained, but there arises a problem that the configuration of the pressurizing apparatus becomes complicated.
この発明の目的は、簡易な装置構成で密度勾配が発生し難い長尺合金ビレットの製造方法を提供することである。 An object of the present invention is to provide a method for producing a long alloy billet in which a density gradient hardly occurs with a simple apparatus configuration.
この発明に従った長尺合金ビレットの製造方法は、第１の合金ビレット、第２の合金ビレットおよび合金粉末を用意する工程と、型内に下から順に第１合金ビレット、合金粉末および第２合金ビレットを積層する工程と、上記合金粉末の粒子を第１合金ビレットおよび第２合金ビレットに食込ませるように型内の積層体を加圧圧縮して一体化した１個の長尺合金ビレットを作製する工程とを備える。 The manufacturing method of a long alloy billet according to the present invention includes a step of preparing a first alloy billet, a second alloy billet and an alloy powder, and a first alloy billet, an alloy powder and a second one in order from the bottom in the mold. The process of laminating the alloy billet and one long alloy billet obtained by compressing and compressing the laminate in the mold so that the particles of the alloy powder are eaten into the first alloy billet and the second alloy billet The process of producing.
上記の本発明の製造方法によれば、合金粉末粒子が第１および第２合金ビレットの表層部に食込むので、第１合金ビレットと第２合金ビレットとは加圧圧縮されて表層部に食込んだ合金粉末圧縮体を介して強固に一体化されて接合する。第１合金ビレットおよび第２合金ビレットは、その長さが相対的に短く、予め密度勾配が生じないように成形されている。また、第１合金ビレットと第２合金ビレットとの間に位置する合金粉末の量は、第１および第２合金ビレットを接合するのに必要な分だけあれば良いので、比較的少量で足りる。したがって、積層体の加圧圧縮工程時に、中間の合金粉末には第１および第２ビレットを介して大きな加圧力が作用し、大きな食込み力を発生させる。こうして最終的に得られる長尺合金ビレットには密度勾配が発生し難く、全体的に均一な密度の長尺合金ビレットとなる。 According to the manufacturing method of the present invention described above, the alloy powder particles bite into the surface layer portions of the first and second alloy billets, so that the first alloy billet and the second alloy billet are pressurized and compressed and eaten into the surface layer portion. It is tightly integrated and joined via the packed alloy powder compact. The first alloy billet and the second alloy billet are relatively short in length and are previously formed so as not to cause a density gradient. Further, the amount of the alloy powder positioned between the first alloy billet and the second alloy billet is sufficient as long as it is necessary for joining the first and second alloy billets, so that a relatively small amount is sufficient. Therefore, during the pressure compression process of the laminated body, a large pressing force acts on the intermediate alloy powder via the first and second billets to generate a large biting force. Thus, the long alloy billet finally obtained does not easily generate a density gradient, and the long alloy billet has a uniform density as a whole.
さらに、上記の方法を実施するにあたり、第１合金ビレットおよび第２合金ビレットは既に成形されているので、装置の押込み型の必要なストロークは小さくてすみ、既存の通常の設備が利用可能である。 Furthermore, in carrying out the above method, the first alloy billet and the second alloy billet are already formed, so that the required stroke of the push-in mold of the apparatus is small, and existing normal equipment can be used. .
第１合金ビレット、第２合金ビレットおよび合金粉末は、それぞれ異なった組成の合金であっても良いが、好ましくは同じ組成の合金である。同じ組成の合金であれば、物性値が均一な長尺ビレットを作製できる。また、第１合金ビレットおよび第２合金ビレットは、鋳造ビレットであっても良いが、好ましくは合金粉末の圧粉固化体である。 The first alloy billet, the second alloy billet and the alloy powder may be alloys having different compositions, but are preferably alloys having the same composition. If the alloys have the same composition, a long billet having uniform physical properties can be produced. The first alloy billet and the second alloy billet may be a cast billet, but are preferably a powder solidified body of an alloy powder.
用意する合金ビレットの数を多くし、隣接配置する合金ビレット間に合金粉末を配置して加圧成形すれば、より長い長尺合金ビレットを得ることができる。また、積層配置する合金ビレットの長さや、合金ビレットの数を調整することによって、長さ自在に長尺ビレットを作製することができる。 If the number of alloy billets to be prepared is increased and the alloy powder is arranged between the adjacent alloy billets and press-molded, a longer long alloy billet can be obtained. Further, by adjusting the length of the alloy billet to be laminated and the number of alloy billets, a long billet can be produced freely.
好ましくは、積層体を加圧圧縮する前の状態では、上記型の内壁面と第１および第２合金ビレットの外面との間には、隙間がある。その場合、型の内壁面と第１および第２合金ビレットの外面との間の隙間は、合金粉末粒子の粒径と同じか、それよりも小さいのが望ましい。このような隙間の大きさであれば、合金粉末粒子が隙間内に落下するのを防ぐことができる。隙間を設けることにより、合金ビレットと型の内壁面とが大きな圧力で接することが無いので、積層体の加圧圧縮時に大きな摩擦力は発生しない。 Preferably, there is a gap between the inner wall surface of the mold and the outer surfaces of the first and second alloy billets in a state before the laminate is compressed and compressed. In that case, the gap between the inner wall surface of the mold and the outer surfaces of the first and second alloy billets is preferably equal to or smaller than the particle size of the alloy powder particles. With such a gap size, the alloy powder particles can be prevented from falling into the gap. By providing the gap, the alloy billet and the inner wall surface of the mold do not come into contact with each other with a large pressure, so that a large frictional force is not generated when the laminate is pressurized and compressed.
型内に投入する合金粉末の全量は、第１および第２合金ビレットの各ビレットの体積と同じか、それよりも少なくするのが望ましい。投入する合金粉末の全量がこの程度であるならば、積層体を加圧圧縮する設備として、１個の合金ビレットを製造するのに使用される既存設備を使用することができる。 It is desirable that the total amount of the alloy powder charged into the mold is equal to or less than the volume of each billet of the first and second alloy billets. If the total amount of the alloy powder to be charged is about this level, the existing equipment used to manufacture one alloy billet can be used as the equipment for compressing and compressing the laminate.
好ましくは、第１合金ビレットおよび第２合金ビレットを、型内に入れるのに先立ち加熱しておく。さらに、好ましくは、合金粉末を常温の状態で型内に投入する。このような温度条件であれば、短尺の第１合金ビレットおよび第２合金ビレットは、合金粉末に比べて高温であるため相対的に硬度が低く、合金粉末は短尺ビレットの表層部に楔のように食込む効果が高くなり、さらなる一体化を促進する。各合金ビレットと合金粉末との温度差を、例えば、１００℃以上にして積層体の加圧圧縮を行なう。 Preferably, the first alloy billet and the second alloy billet are heated prior to placing them in the mold. Further, preferably, the alloy powder is put into a mold at a room temperature. Under such temperature conditions, the short first billet and the second alloy billet are relatively low in hardness because they are hotter than the alloy powder, and the alloy powder is like a wedge on the surface layer of the short billet. Increases the effect of eating into and promotes further integration. The temperature difference between each alloy billet and the alloy powder is set to, for example, 100 ° C. or more, and the laminate is pressurized and compressed.
この発明の他の局面における長尺合金ビレットの製造方法は、第１の合金粉末を第１の穴径を有する第１の型内に投入して加圧圧縮することにより第１の合金ビレットを作製する工程と、第２の合金粉末を第１の穴径を有する第１の型内に投入して加圧圧縮することにより第２の合金ビレットを作製する工程と、第１および第２の合金ビレットを加熱する工程と、第１の穴径よりも大きな第２の穴径を有する第２の型内に、下から順に加熱された第１合金ビレット、常温状態の第３の合金粉末および加熱された第２合金ビレットを積層する工程と、第３合金粉末粒子を第１および第２合金ビレットに食込ませるように第２の型内の積層体を加圧圧縮して一体化した１個の長尺合金ビレットを作製する工程とを備える。 According to another aspect of the present invention, there is provided a method for producing a long alloy billet, wherein a first alloy powder is injected into a first mold having a first hole diameter and compressed by pressure. A step of producing, a step of producing a second alloy billet by putting the second alloy powder into a first mold having a first hole diameter and compressing the second alloy powder, and the first and second A step of heating the alloy billet; a first alloy billet heated in order from the bottom in a second mold having a second hole diameter larger than the first hole diameter; a third alloy powder in a room temperature state; The step of laminating the heated second alloy billet and the laminated body in the second mold are integrated by pressing and compressing so that the third alloy powder particles are eaten into the first and second alloy billets. And a step of producing individual long alloy billets.
好ましくは、第２の穴径と第１の穴径との差は、第３合金粉末粒子の粒径と同じか、それよりも小さい。第２の型内での積層体の加圧圧縮は、加熱された各合金ビレットと常温の第３合金粉末との温度差を例えば１００℃以上にして行う。第１合金粉末、第２合金粉末および第３合金粉末は、例えば、同じ組成の合金である。 Preferably, the difference between the second hole diameter and the first hole diameter is the same as or smaller than the particle diameter of the third alloy powder particles. The pressure compression of the laminated body in the second mold is performed by setting the temperature difference between each heated alloy billet and the third alloy powder at room temperature to 100 ° C. or more, for example. The first alloy powder, the second alloy powder, and the third alloy powder are alloys having the same composition, for example.
図１は、本発明に従った長尺合金ビレットの製造工程を図解的に示す図である。 FIG. 1 is a view schematically showing a manufacturing process of a long alloy billet according to the present invention.
まず、図１(ａ)に示すように、合金粉末を所定の径の型内に投入し、押込み型（パンチ）により適切な加圧力を与えて合金ビレット１を作製する。この合金ビレット１を複数個用意する。 First, as shown in FIG. 1 (a), alloy powder is put into a mold having a predetermined diameter, and an appropriate pressurizing force is applied by a pressing mold (punch) to produce an alloy billet 1. A plurality of the alloy billets 1 are prepared.
次に、図１（ｂ）に示すように、合金ビレット１の外径よりも大きな内径を有する成形用型３内に、下から順に合金ビレット１、合金粉末２、合金ビレット１、合金粉末２および合金ビレット１を積層する。好ましくは、合金ビレット１と合金粉末２とは、同じ組成の合金である。 Next, as shown in FIG. 1 (b), the alloy billet 1, the alloy powder 2, the alloy billet 1, and the alloy powder 2 are placed in order from the bottom in the molding die 3 having an inner diameter larger than the outer diameter of the alloy billet 1. And an alloy billet 1 are laminated. Preferably, the alloy billet 1 and the alloy powder 2 are alloys having the same composition.
合金ビレット１と型３の内壁面とのクリアランスは、合金粉末粒子の径と同程度、またはそれよりも小さくするのが好ましい。このような寸法関係であれば、合金粉末粒子の落下等の問題を生じることなく、積層体を加圧成形できる。但し、クリアランスが小さすぎると、合金ビレット１の型３内への投入が困難となったり、合金ビレット１と型３の内壁面との間に大きな摩擦力が発生したりする。 It is preferable that the clearance between the alloy billet 1 and the inner wall surface of the mold 3 is equal to or smaller than the diameter of the alloy powder particles. With such a dimensional relationship, the laminate can be pressure-formed without causing problems such as dropping of the alloy powder particles. However, if the clearance is too small, it is difficult to put the alloy billet 1 into the mold 3 or a large frictional force is generated between the alloy billet 1 and the inner wall surface of the mold 3.
既存の装置の押込み型の押込みストロークの観点から、型３内に投入する合金粉末２の全量を合金ビレット１の１個分未満にするのが良い。このような合金粉末投入量であれば、既存装置をそのまま利用できる。 From the viewpoint of the indentation stroke of the indentation die of the existing apparatus, the total amount of the alloy powder 2 put into the die 3 is preferably less than one alloy billet 1. With such an alloy powder input amount, the existing apparatus can be used as it is.
型３内に配置された積層体を上方から加圧することにより、図１（ｃ）に示す長尺合金ビレット４が得られる。加圧力は、投入合金粉末２の量に依存するが、前述のように全量で合金ビレット１の一個分以下であれば、短尺の合金ビレット１の作製時と同程度で良い。 By pressing the laminate disposed in the mold 3 from above, the long alloy billet 4 shown in FIG. 1C is obtained. The applied pressure depends on the amount of the input alloy powder 2, but as long as the total amount is equal to or less than one alloy billet 1 as described above, it may be approximately the same as that for producing the short alloy billet 1.
隣接する合金ビレット１間に投入される合金粉末２は、上下の合金ビレット１の表層部に食込み、継ぎ目となる。この合金粉末２が存在しなければ、上下の合金ビレット１の継ぎ目は、表面のひび割れとして認識できる状態であり、一体化せず、衝撃等で分離するおそれがある。合金粉末２が継ぎ目として作用するには、隣接する合金ビレット１間の合金粉末２の層高さは、１０ｍｍ程度あれば良い。 The alloy powder 2 put between the adjacent alloy billets 1 bites into the surface layer portions of the upper and lower alloy billets 1 and becomes a seam. If this alloy powder 2 does not exist, the joints of the upper and lower alloy billets 1 are in a state where they can be recognized as surface cracks, and may not be integrated and may be separated by impact or the like. In order for the alloy powder 2 to act as a joint, the layer height of the alloy powder 2 between the adjacent alloy billets 1 may be about 10 mm.
図３は、本発明に従った長尺合金ビレットの製造工程の他の例を示す図解図である。 FIG. 3 is an illustrative view showing another example of the production process of the long alloy billet according to the present invention.
まず、図３（ａ）に示すように、穴径Ｄ１を有する第１の型１２内に合金粉末１１を投入し、この合金粉末を加圧圧縮して図３（ｂ）に示す相対的に短尺の合金ビレット１３を作製する。円柱形状の合金ビレット１３の外径は、第１の型１２の穴径と同じＤ１である。同様の方法で、複数の合金ビレット１３を作製する。複数の合金ビレットは同じ組成のものであっても良いし、異なった組成のものであっても良い。 First, as shown in FIG. 3A, the alloy powder 11 is put into a first mold 12 having a hole diameter D1, and this alloy powder is compressed and compressed as shown in FIG. A short alloy billet 13 is produced. The outer diameter of the cylindrical alloy billet 13 is D1 which is the same as the hole diameter of the first mold 12. A plurality of alloy billets 13 are produced by the same method. The plurality of alloy billets may have the same composition or may have different compositions.
次に、図３（ｃ）に示すように、複数の合金ビレット１３を例えば加熱炉１４内で加熱する。 Next, as shown in FIG. 3C, the plurality of alloy billets 13 are heated in, for example, a heating furnace 14.
次に、図３（ｄ）に示すように、第１の型１２の穴径Ｄ１よりも大きな穴径Ｄ２を有する第２の型１６内に、下から順に加熱された合金ビレット１３、常温状態の合金粉末１５、加熱された合金ビレット１３、常温状態の合金粉末１５および加熱された合金ビレット１３を積層する。各合金ビレット１３の外径Ｄ１は、第２の型１６の穴径Ｄ２よりも僅かに小さいので、各合金ビレット１３の外周面と第２の型１６の内壁面との間には、（Ｄ２−Ｄ１）の大きさの隙間が生ずる。好ましくは、この隙間の大きさは、合金粉末１５の粒子の粒径と同じか、それよりも小さくする。このような寸法関係であれば、合金粉末１５の粒子の落下等の問題を生じることなく、積層体を加圧圧縮成形することができる。ただし、隙間が小さすぎると、合金ビレット１３の投入が困難となったり、合金ビレット１３の外周面と型１６の内壁面との間に大きな摩擦力が発生したりする。 Next, as shown in FIG. 3 (d), the alloy billet 13 heated in order from the bottom in the second mold 16 having the hole diameter D2 larger than the hole diameter D1 of the first mold 12, the room temperature state The alloy powder 15, the heated alloy billet 13, the room temperature alloy powder 15, and the heated alloy billet 13 are laminated. Since the outer diameter D1 of each alloy billet 13 is slightly smaller than the hole diameter D2 of the second die 16, (D2) is provided between the outer peripheral surface of each alloy billet 13 and the inner wall surface of the second die 16. A gap having a size of -D1) is generated. Preferably, the size of the gap is the same as or smaller than the particle diameter of the alloy powder 15. With such a dimensional relationship, the laminate can be compression-compressed without causing problems such as dropping of the particles of the alloy powder 15. However, if the gap is too small, it is difficult to insert the alloy billet 13 or a large frictional force is generated between the outer peripheral surface of the alloy billet 13 and the inner wall surface of the mold 16.
型１６内に入れられた各合金ビレット１３は加熱され、その間に位置する各合金粉末１５は常温状態である。合金ビレット１３と合金粉末１５とが同じ合金組成であったとしても、常温状態の合金粉末１５の硬度は、加熱状態にある合金ビレット１５の硬度よりも相対的に高くなる。したがって、第２の型１６内の積層体に対する加圧圧縮工程時に、常温状態の合金粉末１５の粒子が上下の合金ビレット１５の表層部に楔のように食込み、全体として一体化した長尺合金ビレット１７が得られる。 Each alloy billet 13 placed in the mold 16 is heated, and each alloy powder 15 positioned therebetween is in a normal temperature state. Even if the alloy billet 13 and the alloy powder 15 have the same alloy composition, the hardness of the alloy powder 15 in the normal temperature state is relatively higher than the hardness of the alloy billet 15 in the heated state. Therefore, at the time of the pressure compression process for the laminated body in the second mold 16, the particles of the alloy powder 15 in a normal temperature state bite into the surface layer portions of the upper and lower alloy billets 15 like a wedge and are integrated as a whole. Billet 17 is obtained.
図３（ｅ）は、第２の型１６内で加圧圧縮成形された長尺合金ビレット１７を示している。この円柱状の長尺合金ビレット１７の外径は、第２の型１６の穴径と同じＤ２である。 FIG. 3 (e) shows a long alloy billet 17 that is compression-compressed in the second mold 16. The outer diameter of the cylindrical long alloy billet 17 is D2 which is the same as the hole diameter of the second die 16.
合金粉末粒子の食込み効果を高めるためには、第２の型１６内に投入される短尺合金ビレット１３と合金粉末１５との温度差は大きいほど好ましい。例えば、短尺合金ビレット１３と合金粉末１５との温度差を１００℃以上にして積層体を加圧圧縮すれば、良好な楔効果によって全体として一体化した長尺合金ビレット１７を効率的に作製することができる。一方、合金ビレットの温度が高すぎると表面酸化するおそれがあるので、そのような酸化現象を生じない程度の温度にしておくことも必要である。 In order to enhance the encroaching effect of the alloy powder particles, it is preferable that the temperature difference between the short alloy billet 13 and the alloy powder 15 put into the second mold 16 is larger. For example, if the laminated body is pressure-compressed by setting the temperature difference between the short alloy billet 13 and the alloy powder 15 to 100 ° C. or more, the long alloy billet 17 integrated as a whole is efficiently produced by a good wedge effect. be able to. On the other hand, if the temperature of the alloy billet is too high, surface oxidation may occur, and it is also necessary to set the temperature so as not to cause such an oxidation phenomenon.
合金ビレットを加熱する方法として、上述したように加熱炉内で加熱するようにしても良いし、第１の型１２にヒータを設けておき、短尺合金ビレット１３の加圧圧縮成形と同時に加熱するようにしても良い。また、第２の型１６内に配置された加熱合金ビレット１３の温度低下防止のために、第２の型１６の内壁面近傍にヒーターを設けるようにしても良い。 As a method of heating the alloy billet, the alloy billet may be heated in the heating furnace as described above, or a heater is provided in the first mold 12 and heated simultaneously with the pressure compression molding of the short alloy billet 13. You may do it. Further, a heater may be provided in the vicinity of the inner wall surface of the second mold 16 in order to prevent a temperature drop of the heated alloy billet 13 disposed in the second mold 16.
直径数ｍｍの平板状マグネシウム合金片からなる合金粉末を所定量、成形用型内に投入し、適切な加圧力を与えて直径７８ｍｍ、長さ６０ｍｍの短尺円柱状合金ビレットを３個作製した。 A predetermined amount of an alloy powder made of a flat magnesium alloy piece having a diameter of several mm was put into a molding die, and three short columnar alloy billets having a diameter of 78 mm and a length of 60 mm were produced by applying an appropriate pressing force.
内径７９ｍｍの成形用型内に、下から順に円柱状合金ビレット、合金粉末（層高さ１０ｍｍ）、円柱状合金ビレット、合金粉末（層高さ１０ｍｍ）および円柱状合金ビレットを積層した。合金ビレットおよび合金粉末は、同一組成のマグネシウム合金である。 A cylindrical alloy billet, alloy powder (layer height 10 mm), columnar alloy billet, alloy powder (layer height 10 mm), and columnar alloy billet were laminated in this order from the bottom in a molding die having an inner diameter of 79 mm. The alloy billet and the alloy powder are magnesium alloys having the same composition.
成形用型内に配置された積層体に対して、押込み型（パンチ）で加圧力を与えて、直径７９ｍｍ、長さ１８５ｍｍの長尺合金ビレットを得た。長尺合金ビレットを得るための加圧力と、短尺合金ビレットを得るための加圧力とは、同程度であった。 A pressurizing die (punch) was applied to the laminate placed in the molding die to obtain a long alloy billet having a diameter of 79 mm and a length of 185 mm. The applied pressure for obtaining the long alloy billet and the applied pressure for obtaining the short alloy billet were approximately the same.
図２は、上から順に、合金粉末、３個の短尺円柱状合金ビレットおよび最終的に得られた長尺合金ビレットを示す写真である。 FIG. 2 is a photograph showing the alloy powder, the three short cylindrical alloy billets, and the finally obtained long alloy billet in order from the top.
以上、図面を参照してこの発明の実施形態を説明したが、この発明は、図示した実施形態のものに限定されない。図示した実施形態に対して、この発明と同一の範囲内において、あるいは均等の範囲内において、種々の修正や変形を加えることが可能である。 As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to the thing of embodiment shown in figure. Various modifications and variations can be made to the illustrated embodiment within the same range or equivalent range as the present invention.
（１）短尺合金ビレットの作製
直径数ｍｍの平板状マグネシウム合金片からなる合金粉末を所定量、成形用型内に投入し、適切な加圧力を与えて直径７８ｍｍ、長さ６０ｍｍの短尺円柱状合金ビレットを３個作製した。
(1) Production of short alloy billet A predetermined amount of alloy powder made of a plate-like magnesium alloy piece having a diameter of several millimeters is put into a molding die, and an appropriate pressure is applied to form a short cylindrical shape having a diameter of 78 mm and a length of 60 mm. Three alloy billets were produced.
（２）短尺合金ビレットの加熱
３個の短尺合金ビレットを加熱炉内で加熱した。所定温度に達した後に、３個の合金ビレットを加熱炉から取り出し、速やかに穴径７９ｍｍの成形用型内に常温状態の合金粉末を間に介在させて投入した。成形用型内では、下から順に、合金ビレット、合金粉末（層高さ約１０ｍｍ）、合金ビレット、合金粉末（層高さ約１０ｍｍ）および合金ビレットが積層された。成形用型は、その穴径が７９ｍｍであり、内壁面近傍に棒状のカートリッジヒーターを８本備えている。ヒーターは、成形用型を短尺合金ビレットと同程度の温度に予め加熱していた。
(2) Heating of short alloy billet Three short alloy billets were heated in a heating furnace. After reaching the predetermined temperature, the three alloy billets were taken out from the heating furnace and immediately put into a molding die having a hole diameter of 79 mm with the alloy powder in a normal temperature state interposed therebetween. In the molding die, an alloy billet, an alloy powder (layer height of about 10 mm), an alloy billet, an alloy powder (layer height of about 10 mm), and an alloy billet were laminated in order from the bottom. The mold has a hole diameter of 79 mm and is provided with eight rod-like cartridge heaters near the inner wall surface. The heater had previously heated the shaping | molding die to the temperature comparable as a short alloy billet.
（３）長尺合金ビレットの作製
成形用型内の積層体を加圧圧縮成形して直径７９ｍｍ、長さ１８５ｍｍの長尺合金ビレットを得た。この加圧圧縮成形時における短尺合金ビレットと合金粉末との温度差は１００℃以上であった。このようにして作製した長尺合金ビレットは、全体として一体化したものであった。
(3) Production of long alloy billet The laminate in the molding die was compression-compressed to obtain a long alloy billet having a diameter of 79 mm and a length of 185 mm. The temperature difference between the short alloy billet and the alloy powder during the pressure compression molding was 100 ° C. or more. The long alloy billet thus produced was integrated as a whole.
この発明は、密度が均一な長尺合金ビレットを製造するための方法として、有利に利用され得る。 The present invention can be advantageously used as a method for producing a long alloy billet having a uniform density.
１ 合金ビレット、２ 合金粉末、３ 型、４ 長尺合金ビレット、１１ 合金粉末、１２ 第１の型、１３ 短尺合金ビレット、１４ 加熱炉、１５ 合金粉末、１６ 第２の型、１７ 長尺合金ビレット。 DESCRIPTION OF SYMBOLS 1 Alloy billet, 2 Alloy powder, 3 type | mold, 4 Long alloy billet, 11 Alloy powder, 12 1st type | mold, 13 Short length alloy billet, 14 Heating furnace, 15 Alloy powder, 16 2nd type | mold, 17 Long alloy Billet.
Claims (13)
型内に下から順に前記第１合金ビレット、合金粉末および第２合金ビレットを積層する工程と、
前記合金粉末粒子を前記第１合金ビレットおよび第２合金ビレットに食込ませるように前記型内の積層体を加圧圧縮して一体化した１個の長尺合金ビレットを作製する工程とを備える、長尺合金ビレットの製造方法。 Providing a first alloy billet, a second alloy billet and an alloy powder;
Laminating the first alloy billet, the alloy powder and the second alloy billet in order from the bottom in the mold;
Producing a single long alloy billet by pressing and compressing the laminated body in the mold so that the alloy powder particles are eaten into the first alloy billet and the second alloy billet. The manufacturing method of a long alloy billet.
第２の合金粉末を前記第１の穴径を有する第１の型内に投入して加圧圧縮することにより第２の合金ビレットを作製する工程と、
前記第１および第２の合金ビレットを加熱する工程と、
前記第１の穴径よりも大きな第２の穴径を有する第２の型内に、下から順に加熱された前記第１合金ビレット、常温状態の第３の合金粉末および加熱された前記第２合金ビレットを積層する工程と、
前記第３合金粉末粒子を前記第１および第２合金ビレットに食込ませるように前記第２の型内の積層体を加圧圧縮して一体化した１個の長尺合金ビレットを作製する工程とを備える、長尺合金ビレットの製造方法。 Producing a first alloy billet by putting the first alloy powder into a first mold having a first hole diameter and compressing the first alloy powder;
Producing a second alloy billet by charging the second alloy powder into the first mold having the first hole diameter and compressing the second alloy powder;
Heating the first and second alloy billets;
In the second mold having the second hole diameter larger than the first hole diameter, the first alloy billet heated in order from the bottom, the third alloy powder in the normal temperature state, and the heated second Laminating alloy billets;
A step of producing a single long alloy billet by compressing and compressing the laminate in the second mold so that the third alloy powder particles are bitten into the first and second alloy billets. A method for producing a long alloy billet.
The method for producing a long alloy billet according to any one of claims 10 to 12, wherein the first alloy powder, the second alloy powder, and the third alloy powder are alloys having the same composition.
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