JP2005074461A - Molding manufacturing method - Google Patents

Molding manufacturing method Download PDF

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JP2005074461A
JP2005074461A JP2003307165A JP2003307165A JP2005074461A JP 2005074461 A JP2005074461 A JP 2005074461A JP 2003307165 A JP2003307165 A JP 2003307165A JP 2003307165 A JP2003307165 A JP 2003307165A JP 2005074461 A JP2005074461 A JP 2005074461A
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mold
molded
pressure
semi
cast
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Nobuo Kitada
Katsunori Noda
Hirobumi Okada
信雄 北田
博文 岡田
勝則 野田
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Kurimoto Ltd
Nisshin Seisakusho:Kk
株式会社日進製作所
株式会社栗本鐵工所
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a molding manufacturing method capable of manufacturing a molding of excellent material characteristic and strength at low cost in relatively simple processes. <P>SOLUTION: Molten metal 11a is poured into molds 1 and 2 and cooled while primary pressure P1 is being applied thereto to mold a semi-molding 11b in a semi-solidified or solidified state. At least part of the semi-molding 11b is plastically deformed to manufacture a molding 11 while secondary pressure P2 larger than the primary pressure P1 is being applied to the molds 1 and 2 without taking out the semi-molding 11b from the molds 1 and 2. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、例えば、アルミニウム合金やマグネシウム合金などのような非鉄金属によって各種の成形品を製造する際の製造方法に関する。   The present invention relates to a manufacturing method for manufacturing various molded articles using a non-ferrous metal such as an aluminum alloy or a magnesium alloy.
このような非鉄金属により各種の成形品を製造する方法としては、金型を使用した「鋳造法」が一般的で、金型内に注入した溶湯に圧力を加えて凝固させ、鋳造組織の成形品を製造する鋳造法も知られており、さらに、固体状の素材を塑性変形させて、鍛造組織の成形品を製造する「型鍛造法」も知られている(鋳造や鍛造はあまりにも一般的で、引用するのに適した特許文献は見当たらない)。   As a method of manufacturing various molded products using such non-ferrous metals, a “casting method” using a mold is generally used, and the molten metal injected into the mold is solidified by applying pressure to form a cast structure. There is also a known casting method for manufacturing products, and there is also known a “die forging method” in which a solid material is plastically deformed to produce a molded product with a forged structure (casting and forging are too common) And no patent literature suitable for citation).
しかし、従来の鋳造法による成形品では、偏析、収縮巣、ポロシティなどの内部欠陥の発生が知られており、たとえ溶湯に圧力を加えて凝固させる鋳造法であっても、あまり高い圧力を加えることができないので、内部欠陥発生の可能性があり、材料特性や強度の面で問題がある。
その点、型鍛造法によれば、内部欠陥の発生もなく、材料特性や強度の面で満足できる成形品を得ることができるが、しかし、固体状の素材を予め所望する成形品に対応する形状に形成しておく必要があり、場合によっては、複数の型を使用して徐々に成形品にまで鍛造する必要があるため、製造工程が複雑になって製造費が高くなるという欠点がある。
However, it is known that internal defects such as segregation, shrinkage, porosity, etc. are known to occur in molded products by conventional casting methods. Even casting methods that solidify by applying pressure to the molten metal apply too high pressure. Since this is not possible, internal defects may occur and there are problems in terms of material properties and strength.
In that respect, according to the die forging method, it is possible to obtain a molded product that is satisfactory in terms of material properties and strength without occurrence of internal defects. However, a solid material corresponds to a desired molded product in advance. It is necessary to form in a shape, and in some cases, it is necessary to gradually forge to a molded product using a plurality of dies, which has the disadvantage that the manufacturing process becomes complicated and the manufacturing cost increases. .
本発明は、このような従来の問題点に着目したもので、その目的は、比較的簡単な工程で安価に、しかも、材料特性や強度の面において優れた成形品を製造することのできる成形品の製造方法を提供することにある。   The present invention pays attention to such conventional problems, and its purpose is molding that can produce a molded product that is inexpensive in a relatively simple process and that is excellent in terms of material properties and strength. It is in providing the manufacturing method of goods.
本発明の第1の特徴構成は、溶湯を注入した金型に1次加圧力を加えながら冷却して半凝固状態または凝固状態の半成形品を鋳造し、その半成形品を前記金型から取り出すことなく、その金型に前記1次加圧力よりも大きな2次加圧力を加えながら、前記半成形品の少なくとも一部を塑性変形させて成形品を製造するところにある。   The first characteristic configuration of the present invention is that a mold into which a molten metal is injected is cooled while applying a primary pressure, and a semi-solid product or a semi-molded product in a solid state is cast, and the semi-molded product is removed from the mold. The molded product is manufactured by plastically deforming at least a part of the semi-molded product while applying a secondary pressure larger than the primary pressure to the mold without taking it out.
本発明の第1の特徴構成によれば、溶湯を注入した金型に1次加圧力を加えながら冷却して半凝固状態または凝固状態の半成形品を鋳造するので、この鋳造によって最終の成形品に近い形状を有し、尚かつ、内部欠陥のない半成形品を得ることができる。
そして、その半成形品を鋳造に使用した金型から取り出すことなく、その金型に1次加圧力よりも大きな2次加圧力を加え、半成形品の少なくとも一部を塑性変形させて成形品を製造する。
その結果、製造工程の簡略化と低廉化を図りながら、材料特質と強度の両面において優れた成形品を安価に製造することができる。
According to the first characteristic configuration of the present invention, the semi-molded product in a semi-solid state or a solid state is cast by cooling the mold into which the molten metal has been injected while applying a primary pressurizing force. A semi-molded product having a shape close to that of the product and having no internal defects can be obtained.
Then, without removing the semi-molded product from the mold used for casting, a secondary pressure greater than the primary pressure is applied to the mold to plastically deform at least a part of the semi-molded product. Manufacturing.
As a result, while simplifying the manufacturing process and reducing the cost, it is possible to manufacture a molded product excellent in both material characteristics and strength at a low cost.
本発明の第2の特徴構成は、前記2次加圧力を加えることにより前記半成形品の一部のみを塑性変形させて、鋳造組織の成形品を製造するところにある。   The second characteristic configuration of the present invention resides in that a molded product having a cast structure is produced by plastically deforming only a part of the semi-molded product by applying the secondary pressure.
本発明の第2の特徴構成によれば、2次加圧力を加えることにより半成形品の一部のみを塑性変形させて、鋳造組織の成形品を製造するので、均質で微細な組織の鋳造品を製造できるのに加えて、所望寸法どおりの鋳造品を安価に製造することができる。
すなわち、金型を使用して鋳造品を製造する際、鋳造品の容積に見合った量の溶湯を金型に注入すればよいが、実際の作業において必要量の溶湯を正確に注入するのはきわめてむずかしい。そこで、従来では、多少多目の量の溶湯を注入して鋳造し、その後、機械加工により所望寸法の製品に仕上げていたのが実情であり、機械加工による仕上げ作業が必要不可欠であった。
According to the second characteristic configuration of the present invention, a molded product having a cast structure is manufactured by plastically deforming only a part of the semi-molded product by applying a secondary pressurizing force. In addition to being able to produce a product, it is possible to produce a cast product according to the desired dimensions at a low cost.
In other words, when a cast product is manufactured using a mold, an amount of molten metal corresponding to the volume of the cast product may be injected into the mold. It is very difficult. Therefore, in the past, a slightly larger amount of molten metal was poured and casted, and then finished into a product with a desired dimension by machining, and finishing work by machining was indispensable.
ところが、本発明の第2の特徴構成によれば、2次加圧力により半成形品の一部のみを塑性変形させるので、その塑性変形により余肉部を形成することで、所望寸法の鋳造品を製造することが可能となる。
具体的には、多目の量の溶湯を金型に注入して半成形品を鋳造し、その後、2次加圧力を加えて所望寸法の鋳造品に成形し、余剰部分を塑性変形させながら金型内へ逃がして余肉部を形成するのである。それによって、鋳造品は所望どおりの寸法となり、その後、余肉部を切除するだけの作業で済み、従来不可欠であった機械加工による仕上げ作業を不用にし、寸法精度の高い鋳造品を安価に製造することができるのである。
However, according to the second characteristic configuration of the present invention, only a part of the half-molded product is plastically deformed by the secondary pressurizing force. Therefore, by forming the surplus portion by the plastic deformation, a cast product having a desired size is obtained. Can be manufactured.
Specifically, a large amount of molten metal is poured into a mold to cast a semi-molded product, and then a secondary pressurizing force is applied to form a cast product of a desired size, while the surplus portion is plastically deformed. It escapes into the mold and forms a surplus part. As a result, the cast product has the desired dimensions, and after that, it is only necessary to cut off the surplus part, eliminating the need for machining work that was indispensable in the past, and producing a cast product with high dimensional accuracy at low cost. It can be done.
本発明の第3の特徴構成は、前記2次加圧力を加えることにより前記半成形品を塑性変形させて、鍛造組織を有する成形品を製造するところにある。   A third characteristic configuration of the present invention resides in that a molded product having a forged structure is produced by plastically deforming the semi-molded product by applying the secondary pressure.
本発明の第3の特徴構成によれば、2次加圧力を加えることにより半成形品を塑性変形させて、鍛造組織を有する成形品を製造するので、鋳造品である半成形品は、鍛錬効果による塑性流動によって均質で微細な鍛造組織となり、同じ金型を使用して鋳造と鍛造を一連の作業で行うことで、最終製品である寸法精度の高い鍛造品を安価に製造することができる。   According to the third characteristic configuration of the present invention, since the semi-molded product is plastically deformed by applying a secondary pressurizing force to produce a molded product having a forged structure, Due to the plastic flow due to the effect, it becomes a homogeneous and fine forging structure, and forging with high dimensional accuracy, which is the final product, can be manufactured at low cost by performing casting and forging in a series of operations using the same mold. .
本発明の第4の特徴構成は、前記溶湯が、アルミニウム合金の溶湯であるところにある。   A fourth characteristic configuration of the present invention is that the molten metal is a molten aluminum alloy.
本発明の第4の特徴構成によれば、金型に注入する溶湯が、アルミニウム合金の溶湯であるから、例えば、耐熱性に優れた耐熱アルミニウム合金製の鋳造品や鍛造品をはじめとして、耐食アルミニウム合金製、あるいは、高力アルミニウム合金製などのような各種の特性を備えた鋳造品および鍛造品を製造することができる。   According to the fourth characteristic configuration of the present invention, since the molten metal to be injected into the mold is a molten aluminum alloy, for example, a cast product and a forged product made of a heat resistant aluminum alloy having excellent heat resistance, and corrosion resistance. Cast products and forged products having various characteristics such as those made of aluminum alloy or high-strength aluminum alloy can be manufactured.
本発明の第5の特徴構成は、前記1次加圧力が、50〜250MPaで、前記2次加圧力が、100〜1000MPaであるところにある。   A fifth characteristic configuration of the present invention is that the primary pressure is 50 to 250 MPa, and the secondary pressure is 100 to 1000 MPa.
本発明の第5の特徴構成によれば、アルミニウム合金の溶湯を使用するに際して、その1次加圧力が、50〜250MPaで、2次加圧力が、100〜1000MPaであるから、所望どおりの材料特質と強度を備えたアルミニウム合金製の鋳造品および鍛造品を確実に製造することができる。   According to the fifth characteristic configuration of the present invention, when using a molten aluminum alloy, the primary pressure is 50 to 250 MPa and the secondary pressure is 100 to 1000 MPa. It is possible to reliably produce castings and forgings made of aluminum alloy having characteristics and strength.
本発明による成形品の製造方法につき、その実施の形態を図面に基づいて説明する。
この製造方法は、例えば、アルミニウム合金やマグネシウム合金などの非鉄金属により各種の成形品、例えば、鋳造成形品や鍛造成形品を製造するための方法で、特に、高い強度と寸法精度の要求される成形品の製造に適し、第1実施例において鋳造品の製造方法につき、また、第2実施例において鍛造品の製造方法につき説明する。
Embodiments of a method for producing a molded article according to the present invention will be described with reference to the drawings.
This manufacturing method is a method for manufacturing various molded products such as cast molded products and forged molded products using non-ferrous metals such as aluminum alloys and magnesium alloys, and particularly requires high strength and dimensional accuracy. It is suitable for manufacturing a molded product, and a manufacturing method of a cast product in the first embodiment and a manufacturing method of a forging product in the second embodiment will be described.
(第1実施例)
鋳造品の製造には、図1に示すように、下金型1と上金型2から構成される金型を使用し、下金型1は、底盤3、底盤3上に設置された筒状の側型4、および、側型4内に上下方向に移動自在に設置された底型5などを備え、底型5は、図外のシリンダなどに連動するピストン棒6によって上下方向に移動可能に構成されている。
底型5の上面近傍には、冷却水用の冷却路7が設けられ、その冷却路7に連通する入水路7aと出水路7bが底盤3と底型5にわたって設けられていて、冷却路7に冷却水を通流させることにより底型5を冷却するように構成されている。
さらに、必要に応じて、側型4にも冷却路を設けることができ、また、図示はしないが、底型5や側型4には、予熱用の加熱手段が設けられている。
(First embodiment)
As shown in FIG. 1, a cast product is manufactured by using a die composed of a lower die 1 and an upper die 2, and the lower die 1 is a bottom plate 3 and a cylinder installed on the bottom plate 3. Side mold 4 and a bottom mold 5 installed in the side mold 4 so as to be movable in the vertical direction. The bottom mold 5 is moved up and down by a piston rod 6 interlocked with a cylinder (not shown). It is configured to be possible.
In the vicinity of the upper surface of the bottom mold 5, a cooling path 7 for cooling water is provided, and a water inlet path 7 a and a water outlet path 7 b communicating with the cooling path 7 are provided across the bottom plate 3 and the bottom mold 5. The bottom mold 5 is cooled by allowing cooling water to flow therethrough.
Furthermore, if necessary, the side mold 4 can also be provided with a cooling path, and although not shown, the bottom mold 5 and the side mold 4 are provided with heating means for preheating.
上金型2は、下金型1の側型4内に挿入自在な第1上型8と、上下方向に相対移動自在に構成された第2上型9などを備え、両上型8,9は、図外の加圧装置にそれぞれ連動されている。
第1上型8の下面近傍にも、冷却水用の冷却路10が設けられ、その冷却路10に連通する入水路10aと出水路10bが第1上型8に設けられていて、冷却路10に冷却水を通流させることにより第1上型8を冷却するように構成されている。そして、図示はしないが、この第1上型8にも予熱用の加熱手段が設けられている。
The upper mold 2 includes a first upper mold 8 that can be inserted into the side mold 4 of the lower mold 1, a second upper mold 9 that is configured to be relatively movable in the vertical direction, and the like. 9 are respectively linked to a pressurizing device (not shown).
A cooling path 10 for cooling water is also provided near the lower surface of the first upper mold 8, and an inlet path 10 a and an outlet path 10 b communicating with the cooling path 10 are provided in the first upper mold 8, and the cooling path The first upper mold 8 is cooled by passing cooling water through 10. Although not shown, the first upper mold 8 is also provided with heating means for preheating.
つぎに、この金型1,2を使用して鋳造品を製造する方法について説明する。
まず、図外の加熱手段により上下の金型1,2を予熱し、図1の(イ)に示すように、アルミニウム合金やマグネシウム合金などの非鉄金属の溶湯11aを下金型1内に注入する。
そして、図1の(ロ)に示すように、第1と第2の上型8,9に1次加圧力P1をそれぞれ加えながら、かつ、両金型1,2の冷却路7,10に冷却水を通流させて金型1,2を冷却しながら、金型1,2によって半凝固状態または凝固状態の半成形品11bを鋳造する。
Next, a method for producing a cast product using the molds 1 and 2 will be described.
First, the upper and lower molds 1 and 2 are preheated by a heating means not shown, and a non-ferrous metal melt 11a such as an aluminum alloy or a magnesium alloy is injected into the lower mold 1 as shown in FIG. To do.
Then, as shown in FIG. 1B, the primary pressure P1 is applied to the first and second upper molds 8 and 9, respectively, and the cooling paths 7 and 10 of both molds 1 and 2 are applied. While the molds 1 and 2 are cooled by flowing cooling water, the molds 1 and 2 are used to cast a semi-solid or solidified semi-molded product 11b.
その後、金型1,2から半成形品11bを取り出すことなく、図1の(ハ)に示すように、第2上型9に1次加圧力P1を掛けたままで、第1上型8に1次加圧力P1よりも大きな2次加圧力P2を加えながら冷却する。
この2次加圧力P2の作用により半凝固状態または凝固状態にある半成形品11bを加圧し、第2上型9の上方への相対移動により半成形品11bの一部を塑性変形させて余肉部11cを形成させる。
その後、図1の(ニ)に示すように、上金型2と底型5を上昇させて余肉部11cを一体的に有する鋳造成形品11を取り出し、余肉部11cを切除して鋳造組織の成形品11を得るのである。
After that, without removing the semi-molded product 11b from the molds 1 and 2, the first upper mold 8 is applied to the second upper mold 9 while the primary pressure P1 is applied as shown in FIG. Cooling is performed while applying a secondary pressure P2 larger than the primary pressure P1.
The semi-molded product 11b in the semi-solid state or solidified state is pressurized by the action of the secondary pressure P2, and a part of the semi-molded product 11b is plastically deformed by the relative movement of the second upper mold 9 upward. The meat part 11c is formed.
Thereafter, as shown in FIG. 1 (d), the upper mold 2 and the bottom mold 5 are raised to take out the cast product 11 integrally having the surplus part 11c, and the surplus part 11c is cut off and cast. The molded article 11 having a structure is obtained.
つぎに、この鋳造品の製造方法を図3のタイムチャート図および図4の状態概念図を参照しながら、より一層具体的に説明する。
例えば、耐熱・耐磨耗アルミニウム合金(4032系合金)製の鋳造成形品11を製造する場合であれば、金型1,2を150〜300℃(423〜573K)に予熱しておいて、図4に示すように、750℃(1023K)程度にまで加熱したアルミニウム合金の溶湯11aを注入し、1次加圧力P1として175MPa前後の圧力を掛けて加圧する。
この1次加圧によって、液体状態にあった溶湯11aは、半凝固状態から凝固状態へと変化して半成形品11bとなり、その半成形品11bの表面温度が400℃(673K)程度、内部温度が500℃(773K)程度になった時点で、460MPa前後の2次加圧力P2を掛けて鋳造成形品11を得る。
Next, the manufacturing method of this cast product will be described more specifically with reference to the time chart of FIG. 3 and the conceptual diagram of FIG.
For example, in the case of producing a cast molded product 11 made of a heat-resistant and wear-resistant aluminum alloy (4032 alloy), the molds 1 and 2 are preheated to 150 to 300 ° C. (423 to 573 K), As shown in FIG. 4, a molten aluminum alloy 11a heated to about 750 ° C. (1023 K) is injected and pressurized by applying a pressure of about 175 MPa as the primary pressure P1.
By this primary pressurization, the molten metal 11a that has been in a liquid state changes from a semi-solid state to a solid state to become a semi-molded product 11b, and the surface temperature of the semi-molded product 11b is about 400 ° C. (673K). When the temperature reaches about 500 ° C. (773 K), the cast molding 11 is obtained by applying a secondary pressure P2 of about 460 MPa.
つぎに、第2実施例について説明するが、重複説明を避けるため、第1実施例で説明した構成や同じ作用を有する構成については、同じ符号を付すことで説明を省略し、主として第1実施例と異なる構成について説明する。   Next, the second embodiment will be described. However, in order to avoid redundant description, the configurations described in the first embodiment and the configurations having the same functions are denoted by the same reference numerals and the description thereof is omitted, and the first embodiment is mainly described. A configuration different from the example will be described.
(第2実施例)
鍛造品の製造には、図2に示すように、下金型1と上金型2から構成される金型を使用し、下金型1は、筒状の側型4、側型4内に上下方向に移動自在に設置された第1底型5a、および、その第1底型5aを貫通して上下方向に相対移動自在に構成された第2底型5bなどを備え、側型4と第2底型5bは、互いに固定状態に維持され、第1底型5aは、図外の加圧装置に連動されている。
上金型2は、第1実施例と同様に、下金型1の側型4内に挿入自在な第1上型8と、上下方向に相対移動自在に構成された第2上型9などを備え、両上型8,9は、図外の加圧装置にそれぞれ連動されている。
(Second embodiment)
As shown in FIG. 2, a forged product is manufactured by using a mold composed of a lower mold 1 and an upper mold 2, and the lower mold 1 includes a cylindrical side mold 4 and a side mold 4. The side mold 4 includes a first bottom mold 5a installed in a vertically movable manner, a second bottom mold 5b penetrating through the first bottom mold 5a and relatively movable in the vertical direction. The second bottom mold 5b is maintained in a fixed state, and the first bottom mold 5a is interlocked with a pressurizing device (not shown).
As in the first embodiment, the upper mold 2 includes a first upper mold 8 that can be inserted into the side mold 4 of the lower mold 1 and a second upper mold 9 that is configured to be relatively movable in the vertical direction. The upper molds 8 and 9 are respectively interlocked with a pressurizing device (not shown).
なお、図示はしないが、両底型5a,5bの上面近傍には、第1実施例で示したような冷却路7が設けられ、かつ、両底型5a,5bや側型4には、予熱用の加熱手段が設けられている。
同様に、第1上型8の下面近傍にも、第1実施例で示したような冷却路10が設けられ、かつ、予熱用の加熱手段が設けられている。
Although not shown, the cooling path 7 as shown in the first embodiment is provided in the vicinity of the top surfaces of the bottom molds 5a and 5b, and the bottom molds 5a and 5b and the side mold 4 have A heating means for preheating is provided.
Similarly, the cooling path 10 as shown in the first embodiment is also provided near the lower surface of the first upper mold 8, and heating means for preheating is also provided.
つぎに、この金型1,2を使用して鍛造品を製造する方法について説明する。
第1実施例と同様、図外の加熱手段により上下の金型1,2を予熱し、図2の(イ)に示すように、アルミニウム合金やマグネシウム合金などの非鉄金属の溶湯11aを下金型1内に注入する。
そして、図2の(ロ)に示すように、第1と第2の上型8,9に1次加圧力P1をそれぞれ加え、かつ、両金型1,2を冷却しながら、金型1,2によって半凝固状態または凝固状態の半成形品11bを鋳造する。
なお、この半成形品11bの鋳造時において、第1底型5aには、1次加圧力P1と同じ背圧P3を掛ける。
Next, a method for producing a forged product using the molds 1 and 2 will be described.
As in the first embodiment, the upper and lower molds 1 and 2 are preheated by a heating means (not shown), and as shown in FIG. 2 (a), a non-ferrous metal melt 11a such as an aluminum alloy or a magnesium alloy is used as a lower metal. Inject into mold 1.
Then, as shown in FIG. 2B, the mold 1 is applied while applying the primary pressure P1 to the first and second upper molds 8 and 9 and cooling both molds 1 and 2, respectively. , 2 is used to cast a semi-solid or solid-state semi-molded product 11b.
In addition, at the time of casting of this semi-molded product 11b, the same back pressure P3 as the primary pressure P1 is applied to the first bottom mold 5a.
その後、金型1,2から半成形品11bを取り出すことなく、図2の(ハ)に示すように、第1と第2上型8,9に1次加圧力P1よりも大きな2次加圧力P2を加えながら冷却し、さらに、図2の(ニ)に示すように、第1上型8に2次加圧力P2を掛けたまま、例えば、第2上型9への加圧力を1次加圧力P1程度にまで減少させる。
なお、この2次加圧力P2の加圧時において、第1底型5aには、加圧当初、2次加圧力P2よりも小さな背圧P3(例えば、1次加圧力P1と同じ背圧)を掛け、第1底型5aが図2の(ハ)に示す位置まで下降したところで、2次加圧力P2と同じ背圧P3を掛ける。
Then, without removing the semi-molded product 11b from the molds 1 and 2, as shown in FIG. 2C, the first and second upper molds 8 and 9 are subjected to a secondary pressure larger than the primary pressure P1. Cooling while applying the pressure P2, and, as shown in FIG. 2 (d), with the secondary pressure P2 applied to the first upper mold 8, for example, the pressure applied to the second upper mold 9 is 1 The pressure is reduced to about the next applied pressure P1.
When the secondary pressure P2 is applied, the first bottom mold 5a is initially applied with a back pressure P3 smaller than the secondary pressure P2 (for example, the same back pressure as the primary pressure P1). When the first bottom mold 5a is lowered to the position shown in FIG. 2C, the same back pressure P3 as the secondary pressure P2 is applied.
この2次加圧力P2の作用により半凝固状態または凝固状態にある半成形品11bを塑性変形させて鍛造し、塑性流動による変形で材料特性を大幅に改善するとともに、第2上型9の上方への相対移動により余肉部11cを形成させる。
その後、図示はしないが、上金型2と第1底型5aを上昇させて余肉部11cを一体的に有する鍛造成形品11を取り出し、余肉部11cを切除して鍛造組織を有する成形品11を得るのである。
The semi-molded product 11b in the semi-solid state or solidified state is plastically deformed and forged by the action of the secondary pressure P2, and the material characteristics are greatly improved by the deformation caused by the plastic flow. The surplus portion 11c is formed by relative movement.
Thereafter, although not shown, the upper mold 2 and the first bottom mold 5a are raised to take out the forged molded product 11 integrally having the surplus portion 11c, and the surplus portion 11c is excised to form a forged structure. The product 11 is obtained.
この鍛造品の製造方法においても、例えば、耐熱・耐磨耗アルミニウム合金(4032系合金)製の鍛造成形品11を製造する場合であれば、金型1,2を150〜300℃(423〜573K)に予熱しておいて、750℃(1023K)程度にまで加熱したアルミニウム合金の溶湯11aを注入し、1次加圧力P1として175MPa前後の圧力を掛けて加圧して半成形品11bを得る。
そして、その半成形品11bの表面温度が400℃(673K)程度、内部温度が500℃(773K)程度になった時点で、460MPa前後の2次加圧力P2を掛けて鍛造成形品11を得るのである。
Also in this forged product manufacturing method, for example, in the case of manufacturing a forged molded product 11 made of a heat-resistant and wear-resistant aluminum alloy (4032-based alloy), the molds 1 and 2 are set to 150 to 300 ° C. (423 to 423). 573K), a molten aluminum alloy 11a heated to about 750 ° C. (1023K) is injected, and a pressure of about 175 MPa is applied as the primary pressure P1 to obtain a semi-molded product 11b. .
Then, when the surface temperature of the semi-molded product 11b is about 400 ° C. (673K) and the internal temperature is about 500 ° C. (773K), a secondary pressure P2 of about 460 MPa is applied to obtain the forged product 11. It is.
ただし、上述した温度や加圧力、つまり、第1実施例と第2実施例において示した数値は単なる一例であり、実際の実施に際しては、使用する合金の種類や成形品11の形状などに応じて、最適な温度や加圧力を選択することになる。
この点に関して種々の実験を行ったところ、図4の右側に示すように、1次加圧力P1としては、50〜250MPaの範囲内が、また、2次加圧力P2としては、100MPa以上、特に、100〜1000MPaの範囲内で、1次加圧力P1よりも大きな圧力を選択するのが好ましいことが判明した。
その1次加圧と2次加圧時における溶湯11aおよび半成形品11bの温度は、図4の左側に示すように、1次加圧時で350〜730℃(623〜1003K)、2次加圧時で200〜550℃(473〜823K)程度であった。
However, the above-described temperatures and pressures, that is, the numerical values shown in the first and second embodiments are merely examples, and in actual implementation, depending on the type of alloy used, the shape of the molded article 11, and the like. Therefore, the optimum temperature and pressure are selected.
When various experiments were conducted on this point, as shown on the right side of FIG. 4, the primary pressure P1 was within a range of 50 to 250 MPa, and the secondary pressure P2 was 100 MPa or more. It was found that it is preferable to select a pressure greater than the primary pressure P1 within the range of 100 to 1000 MPa.
The temperatures of the molten metal 11a and the semi-molded product 11b at the time of the primary pressurization and the secondary pressurization are 350 to 730 ° C. (623 to 1003 K) at the time of the primary pressurization, as shown on the left side of FIG. It was about 200-550 degreeC (473-823K) at the time of pressurization.
〔別実施形態〕
先の実施形態では、アルミニウム合金製の成形品11を製造する例について説明したが、アルミニウムやアルミニウム合金以外にも、マグネシウムやマグネシウム合金などの各種の非鉄金属製の成形品を製造する場合にも適用することができる。
製造の対象となる成形品11については、特に制限はなく、したがって、使用する金型についても、先の実施形態で示した金型1,2に限るものではなく、各種の形状や構成を有する金型を使用することができる。
[Another embodiment]
In the previous embodiment, the example of manufacturing the molded article 11 made of an aluminum alloy has been described. However, in addition to aluminum and aluminum alloy, various non-ferrous metal molded articles such as magnesium and magnesium alloy are manufactured. Can be applied.
The molded product 11 to be manufactured is not particularly limited. Therefore, the mold to be used is not limited to the molds 1 and 2 shown in the previous embodiment, and has various shapes and configurations. A mold can be used.
鋳造品の製造工程を示す概念図Conceptual diagram showing the manufacturing process of castings 鍛造品の製造工程を示す概念図Conceptual diagram showing the manufacturing process of forged products 製造工程のタイムチャート図Manufacturing process time chart 製造工程の状態概念図Manufacturing process state conceptual diagram
符号の説明Explanation of symbols
1,2 金型
11 成形品
11a 溶湯
11b 半成形品
P1 1次加圧力
P2 2次加圧力
1, 2 Mold 11 Molded product 11a Molten metal 11b Semi-molded product P1 Primary pressure P2 Secondary pressure

Claims (5)

  1. 溶湯を注入した金型に1次加圧力を加えながら冷却して半凝固状態または凝固状態の半成形品を鋳造し、その半成形品を前記金型から取り出すことなく、その金型に前記1次加圧力よりも大きな2次加圧力を加えながら、前記半成形品の少なくとも一部を塑性変形させて成形品を製造する成形品の製造方法。   The mold into which the molten metal has been injected is cooled while applying a primary pressure to cast a semi-solid or solid-state semi-molded product, and the semi-molded product is removed from the mold without removing the 1 A method for producing a molded product, wherein a molded product is produced by plastically deforming at least a part of the semi-molded product while applying a secondary pressure greater than the secondary pressure.
  2. 前記2次加圧力を加えることにより前記半成形品の一部のみを塑性変形させて、鋳造組織の成形品を製造する請求項1に記載の成形品の製造方法。   The method for producing a molded article according to claim 1, wherein a molded article having a cast structure is produced by plastically deforming only a part of the semi-molded article by applying the secondary pressure.
  3. 前記2次加圧力を加えることにより前記半成形品を塑性変形させて、鍛造組織を有する成形品を製造する請求項1に記載の成形品の製造方法。   The method for producing a molded product according to claim 1, wherein the molded product having a forged structure is produced by plastically deforming the semi-molded product by applying the secondary pressure.
  4. 前記溶湯が、アルミニウム合金の溶湯である請求項2または3に記載の成形品の製造方法。   The method for producing a molded article according to claim 2 or 3, wherein the molten metal is a molten aluminum alloy.
  5. 前記1次加圧力が、50〜250MPaで、前記2次加圧力が、100〜1000MPaである請求項4に記載の成形品の製造方法。   The method for producing a molded product according to claim 4, wherein the primary pressure is 50 to 250 MPa, and the secondary pressure is 100 to 1000 MPa.
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