JP2002066708A - Feeding device of molten metal - Google Patents
Feeding device of molten metalInfo
- Publication number
- JP2002066708A JP2002066708A JP2000254936A JP2000254936A JP2002066708A JP 2002066708 A JP2002066708 A JP 2002066708A JP 2000254936 A JP2000254936 A JP 2000254936A JP 2000254936 A JP2000254936 A JP 2000254936A JP 2002066708 A JP2002066708 A JP 2002066708A
- Authority
- JP
- Japan
- Prior art keywords
- cylinder
- molten metal
- screw
- layer material
- outer layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 70
- 239000002184 metal Substances 0.000 title claims abstract description 70
- 239000000463 material Substances 0.000 claims abstract description 65
- 239000010935 stainless steel Substances 0.000 claims abstract description 14
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 14
- VNNRSPGTAMTISX-UHFFFAOYSA-N chromium nickel Chemical compound [Cr].[Ni] VNNRSPGTAMTISX-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910018487 Ni—Cr Inorganic materials 0.000 claims abstract description 6
- 229910052581 Si3N4 Inorganic materials 0.000 claims abstract description 4
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims abstract description 4
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000010410 layer Substances 0.000 claims description 43
- 238000005299 abrasion Methods 0.000 claims description 10
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 9
- 239000011248 coating agent Substances 0.000 claims description 9
- 238000000576 coating method Methods 0.000 claims description 9
- 239000000835 fiber Substances 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 8
- 239000011247 coating layer Substances 0.000 claims description 6
- 230000002093 peripheral effect Effects 0.000 claims description 4
- 239000000843 powder Substances 0.000 claims description 4
- MEOSMFUUJVIIKB-UHFFFAOYSA-N [W].[C] Chemical compound [W].[C] MEOSMFUUJVIIKB-UHFFFAOYSA-N 0.000 claims 1
- 239000000203 mixture Substances 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 16
- 239000000956 alloy Substances 0.000 description 10
- 229910045601 alloy Inorganic materials 0.000 description 8
- 238000001816 cooling Methods 0.000 description 8
- 229910052742 iron Inorganic materials 0.000 description 8
- 229910052782 aluminium Inorganic materials 0.000 description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 7
- 229910001120 nichrome Inorganic materials 0.000 description 6
- 238000001746 injection moulding Methods 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 238000010828 elution Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 230000009257 reactivity Effects 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 239000007921 spray Substances 0.000 description 4
- 238000005507 spraying Methods 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000007751 thermal spraying Methods 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 3
- 210000001787 dendrite Anatomy 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 238000011144 upstream manufacturing Methods 0.000 description 3
- 229910052582 BN Inorganic materials 0.000 description 2
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 2
- 229910010293 ceramic material Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910018084 Al-Fe Inorganic materials 0.000 description 1
- 229910018192 Al—Fe Inorganic materials 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910001315 Tool steel Inorganic materials 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000005524 ceramic coating Methods 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910001092 metal group alloy Inorganic materials 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
Landscapes
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ダイカストや金属
射出成形等に用いられる溶融金属の供給装置に関するも
のである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molten metal supply device used for die casting, metal injection molding, and the like.
【０００２】[0002]
【従来の技術】一般に、固体の金属材料から所望の品質
及び形状の製品を製造するには、射出成形機が使用され
ている。この射出成形機は、室温で適当な金属合金の溶
融金属を受容する供給ホッパと、ケーシングであるシリ
ンダの内部に回転可能なスクリュを配設した押出機と、
該押出機の内部に連通するキャビティが設けられた金型
とを備えている。このような射出成形機を使用して製品
を製造するには、まず、供給ホッパから導管を介して押
出機内に溶融金属を供給し、次いで押出機のスクリュを
回転駆動させ、供給された溶融金属を押し出しながら冷
却してシャーベット状にした後、合金原料を押出機の先
端から金型のキャビティに圧入すれば、合金製品が得ら
れる。2. Description of the Related Art In general, an injection molding machine is used to produce a product of a desired quality and shape from a solid metal material. This injection molding machine has a feed hopper that receives a molten metal of a suitable metal alloy at room temperature, and an extruder that has a rotatable screw disposed inside a cylinder that is a casing.
A mold provided with a cavity communicating with the inside of the extruder. In order to manufacture a product using such an injection molding machine, first, molten metal is supplied into the extruder from a supply hopper via a conduit, and then the screw of the extruder is rotationally driven to supply the molten metal. After extruding and cooling the material into a sherbet shape, the alloy material is obtained by pressing the alloy raw material into the mold cavity from the tip of the extruder.
【０００３】図４は、上記した押出機のシリンダ５１の
一部を示す壁部断面図である。押出機は上述のように溶
融金属が供給され、この溶融金属がシリンダ内で攪拌さ
れることから耐熱性が高く、摩耗に対する強度の大きい
耐熱鋼が使用されている。具体的な材料としては、ＳＵ
ＳやＳＵＨのステンレス鋼が用いられている。図５は、
その内部に配設されているスクリュ５２を示す。スクリ
ュ５２の軸５３の外周部には、溶融金属押出用の螺旋状
の凸リブ５４が形成されている。そして、スクリュ５２
の材質としては、耐熱工具鋼（ＳＫＤ）や窒化鋼等が使
用されている。FIG. 4 is a sectional view of a wall showing a part of a cylinder 51 of the above-described extruder. The extruder is supplied with molten metal as described above, and since the molten metal is stirred in the cylinder, heat-resistant steel having high heat resistance and high strength against abrasion is used. Specific materials include SU
Stainless steel such as S or SUH is used. FIG.
9 shows a screw 52 disposed therein. A helical convex rib 54 for extruding molten metal is formed on the outer periphery of the shaft 53 of the screw 52. And screw 52
As the material of the steel, heat-resistant tool steel (SKD), nitrided steel, or the like is used.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、シリン
ダ５１やスクリュ５２に鉄系金属を用いると、これが溶
融原料であるアルミニウムやマグネシウム等と反応し、
溶融アルミニウム等に鉄が溶出してシリンダ内部が減肉
したり、凸リブ（なおこの凸リブが形成されている部分
をスクリュフライト部という）５４が減肉することがあ
る。凸リブ５４が減肉すると、半溶融金属を効率良く押
出せなくなってしまう。これに加えて、押出機の使用温
度域である約６００℃付近では、シリンダ５１やスクリ
ュ５２の硬さが低下し、これらシリンダ５１とスクリュ
５２との接触や凝固しだした固相により凸リブ５４が摩
耗するため、さらに押出能力が低下し半溶融金属を排出
口側へ押し出せなくなってしまう。また、溶融アルミニ
ウム等に溶け込んだ鉄等の不純物が凝固時にＡｌ−Ｆｅ
等の脆い化合物を形成し、合金の機械的性質を劣化させ
る。However, when an iron-based metal is used for the cylinder 51 and the screw 52, the iron-based metal reacts with the molten raw material such as aluminum and magnesium.
Iron may be eluted into the molten aluminum or the like, and the inside of the cylinder may be reduced in thickness, or the convex rib (the portion where the convex rib is formed is referred to as a screw flight portion) 54 may be reduced in thickness. When the thickness of the convex rib 54 is reduced, the semi-molten metal cannot be efficiently extruded. In addition, in the vicinity of the operating temperature range of the extruder of about 600 ° C., the hardness of the cylinder 51 and the screw 52 is reduced, and the contact between the cylinder 51 and the screw 52 and the solidified solidified form cause the convex ribs. Since the abrasion of the metal 54 occurs, the extruding ability is further reduced and the semi-molten metal cannot be pushed out to the discharge port side. Further, impurities such as iron dissolved in the molten aluminum or the like may cause Al-Fe
Etc., and degrade the mechanical properties of the alloy.
【０００５】このような観点から、耐熱性があり反応性
の低い種々の材料をシリンダ５１やスクリュ５２に用い
ることを試みたが、シリンダ５１については、反応性が
低くても強度的に耐えられなかったり、スクリュ５２に
ついてはその形状の複雑さから加工がしにくく困難を極
めていた。本発明はこのような事情に鑑みてなされたも
ので、溶融金属に対して非反応性であり、かつ摩耗され
にくい材料を用いた押出機のシリンダやスクリュを備え
た溶融金属の供給装置を提供することにある。[0005] From such a viewpoint, various materials having heat resistance and low reactivity have been tried to be used for the cylinder 51 and the screw 52. However, the cylinder 51 can withstand the strength even if the reactivity is low. In addition, the screw 52 was difficult to machine due to the complexity of its shape, and was extremely difficult. The present invention has been made in view of such circumstances, and provides a molten metal supply apparatus including a cylinder or a screw of an extruder using a material that is non-reactive with the molten metal and that is not easily worn. Is to do.
【０００６】[0006]
【課題を解決するための手段】本発明は上記目的を達成
するために、溶融した金属が内部に導入されるシリンダ
と、該シリンダ内に設けられ、該シリンダ内の溶融金属
を撹拌しながら排出口側へ連続移送するスクリュとを備
えた溶融金属の供給装置において、上記シリンダの周壁
を異種材料の内層材と外層材とにより形成し、該内層材
が上記溶融金属に対して上記外層材よりも反応しにくい
材料を用いた。上記発明は、上記シリンダの内層材を窒
化珪素により形成し、上記外層材をステンレス鋼で形成
し、これら内層材及び外層材間に内外層材の熱膨張差を
吸収する緩衝材を配設することができる。また、上記発
明は、上記シリンダの内層材及び外層材の径方向の熱膨
張差を吸収する緩衝材として、アルミナ繊維及びこれに
充填されるステンレス粉を用い、上記シリンダの内層材
及び外層材の軸方向の熱膨張差を吸収する緩衝材とし
て、アルミナ繊維を用いることができる。さらに、上記
発明は、上記スクリュの表面に、７０〜８０重量％のタ
ングステンカーバイトと、残余が３０〜２０重量％のニ
ッケルクロムとからなる溶射膜層を形成することができ
る。また、本発明は、溶融した金属が内部に導入される
シリンダと、該シリンダ内に設けられ、該シリンダ内の
溶融金属を撹拌しながら排出口側へ連続移送するスクリ
ュとを備えた溶融金属の供給装置において、上記スクリ
ュの表面に該スクリュの母材よりも摩耗に対する強度が
大きく、かつ上記母材に対して上記溶融金属よりも反応
しにくい材料をコーティングすることができる。また、
この発明は、上記コーティング材を、７０〜８０重量％
のタングステンカーボンと残余が３０〜２０重量％のニ
ッケルクロムからなる溶射膜層とすることができる。SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a cylinder into which molten metal is introduced, and a cylinder provided in the cylinder, and the molten metal in the cylinder is discharged while being stirred. In a molten metal supply device including a screw that is continuously transferred to an outlet side, a peripheral wall of the cylinder is formed by an inner layer material and an outer layer material of different materials, and the inner layer material is formed by the outer layer material with respect to the molten metal. Also, a material that is difficult to react was used. In the above invention, the inner layer material of the cylinder is formed of silicon nitride, the outer layer material is formed of stainless steel, and a buffer material for absorbing a difference in thermal expansion between the inner and outer layer materials is provided between the inner layer material and the outer layer material. be able to. Further, the present invention uses alumina fiber and stainless steel powder filled therein as a buffer material for absorbing a difference in radial thermal expansion between the inner layer material and the outer layer material of the cylinder, and forms the inner layer material and the outer layer material of the cylinder. Alumina fiber can be used as a cushioning material for absorbing a difference in thermal expansion in the axial direction. Further, according to the present invention, a sprayed film layer composed of 70 to 80% by weight of tungsten carbide and 30 to 20% by weight of nickel chromium can be formed on the surface of the screw. Further, the present invention provides a molten metal having a cylinder into which a molten metal is introduced, and a screw provided in the cylinder and continuously transferring the molten metal in the cylinder to an outlet while stirring the molten metal. In the supply device, the surface of the screw can be coated with a material having a greater resistance to abrasion than the base material of the screw and less reactive to the base material than the molten metal. Also,
According to the present invention, the coating material is contained in an amount of 70 to 80% by weight.
And a balance of 30 to 20% by weight of nickel chromium.
【０００７】[0007]
【発明の実施の形態】以下、本発明を図示の実施の形態
について図面を参照しながら説明する。図１は本発明の
一実施形態に係る溶融金属の供給装置の構成図である。
図に示す如く、連続装置（押出機）は、例えばシリコン
（Ｓｉ）とアルミニウム（Ａｌ）との合金材料をシリン
ダ２の入口部２ａ内に供給する供給手段３と、当該シリ
ンダ２の外周壁を加熱または冷却してシリンダ温度を調
節することにより、シリンダ２内に供給された溶融金属
１を半溶融金属とする温度制御手段４と、当該シリンダ
２内の半溶融金属を連続的に撹拌及び移送する撹拌移送
手段５と、当該シリンダ２の出口部２ｂまで撹拌移送さ
れた半溶融金属の溶融状態を検出する溶融状態検出手段
６とをそれぞれ具備している。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings with reference to the drawings. FIG. 1 is a configuration diagram of a supply device of a molten metal according to an embodiment of the present invention.
As shown in the figure, a continuous apparatus (extruder) is provided with a supply means 3 for supplying an alloy material of, for example, silicon (Si) and aluminum (Al) into an inlet 2a of a cylinder 2, and an outer peripheral wall of the cylinder 2. Temperature control means 4 for converting the molten metal 1 supplied into the cylinder 2 into semi-molten metal by heating or cooling to adjust the cylinder temperature, and continuously stirring and transferring the semi-molten metal in the cylinder 2 And a molten state detecting means 6 for detecting a molten state of the semi-molten metal stirred and transported to the outlet 2b of the cylinder 2.
【０００８】上記シリンダ２は、先細りの有底円筒状に
形成され、ほぼ水平状態に配置されている。図２に示す
ように、シリンダ２は外側に配装された外層管２１と内
側に配装された内層管２２とに分割された２重構造であ
り、大径の円筒状の外層管２１の材質はＳＵＳ（ステン
レス）が用いられ、小径の円筒状の内層管２２には、Ｓ
ｉ3Ｎ4（窒化珪素）が用いられている。シリンダ２のサ
イズは種々の大きさがあるが、本実施の形態では外層管
２１の外径が約６０ｍｍであり、内層管２２の内径が約
３０ｍｍであり、外層管２１の肉厚は約５ｍｍとし、内
層管２２の肉厚は約１０ｍｍとした。そして、外層管２
１と内層管２２との間の隙間に設けられた中間層２３に
は、アルミナ繊維とこのアルミナ繊維中の隙間にＳＵＳ
粉を充填している。[0008] The cylinder 2 is formed in a tapered bottomed cylindrical shape and is arranged substantially horizontally. As shown in FIG. 2, the cylinder 2 has a double structure that is divided into an outer pipe 21 disposed on the outside and an inner pipe 22 disposed on the inside, and the cylinder 2 has a cylindrical outer pipe 21 having a large diameter. The material is SUS (stainless steel), and the small-diameter cylindrical inner tube 22 is made of S
i 3 N 4 (silicon nitride) is used. Although the cylinder 2 has various sizes, in the present embodiment, the outer diameter of the outer pipe 21 is about 60 mm, the inner diameter of the inner pipe 22 is about 30 mm, and the thickness of the outer pipe 21 is about 5 mm. The thickness of the inner tube 22 was about 10 mm. And outer layer pipe 2
The intermediate layer 23 provided in the gap between the inner layer pipe 1 and the inner layer pipe 22 has alumina fiber and SUS in the gap in the alumina fiber.
Filled with powder.
【０００９】内層管２２の肉厚は成形が可能であれば、
特に厚さは問わず、外層管２１は内層管２２等を支持す
るために設けている。中間層２３を設けたのは、ＳＵＳ
である外層管とＳｉ3Ｎ4である内層管２２の熱膨張率が
異なるので、その差を吸収させるためである。したがっ
て、シリンダ２の作業温度域差、及びＳＵＳとＳｉ3Ｎ4
との熱膨張率の差を乗ずることにより中間層２３の隙間
が設定される。なお、熱膨張率は、ＳＵＳの方がＳｉ3
Ｎ4よりも大きく、作業温度域である６００度では、１
０００ｍｍに対して約７〜８ｍｍの差がある。また、内
層管２２の端部には、シリンダ２の長手方向の熱膨張差
を吸収する環状層２４を環状に配設し、環状層２４には
アルミナ（Ａｌ2Ｏ3）繊維を用いている。なお、内層管
２２の材質は、反応性が低く、強度的に耐えられるもの
が使用でき、主としてセラミックがある。強度的にＳｉ
3Ｎ4よりも劣るが、その他ＢＮ（窒化ほう素）なども使
用できる。If the thickness of the inner tube 22 can be formed,
Regardless of the thickness, the outer tube 21 is provided to support the inner tube 22 and the like. The intermediate layer 23 is provided by SUS
This is because the difference between the thermal expansion coefficients of the outer tube 22 and the inner tube 22 made of Si 3 N 4 is different, and the difference is absorbed. Therefore, the working temperature range difference of the cylinder 2 and SUS and Si 3 N 4
The gap between the intermediate layers 23 is set by multiplying the difference in the coefficient of thermal expansion between them. The thermal expansion coefficient of SUS is higher than that of Si 3
Greater than N 4, at 600 ° a working temperature range, 1
There is a difference of about 7-8 mm for 000 mm. At the end of the inner tube 22, an annular layer 24 for absorbing a difference in thermal expansion in the longitudinal direction of the cylinder 2 is annularly disposed, and the annular layer 24 is made of alumina (Al 2 O 3 ) fiber. . In addition, as the material of the inner tube 22, a material having low reactivity and endurable in strength can be used, and there is mainly a ceramic. Si in strength
3 N 4 inferior, but like other BN (boron nitride) it can also be used.
【００１０】そして、シリンダ２の上流側の上壁には、
供給手段３と連通する入口部２ａが設けられると共に、
下流側の先端には、冷却装置（成形装置）７と連通する
出口部２ｂが設けられている。上記供給手段３は、外部
に設けられた図示しない加熱装置などで溶融され、かつ
搬送されてきた溶融金属１を貯蔵するホッパ状の保持炉
８と、この保持炉８の外周囲に配設され、保持炉８内の
溶融金属１の温度を一定に保つ保温ヒータ９と、保持炉
８の底部に一体的に設けられ、保持炉８及びシリンダ２
に連通する導管８ａとから構成されている。Then, on the upper wall on the upstream side of the cylinder 2,
An inlet 2a communicating with the supply means 3 is provided,
An outlet 2b communicating with the cooling device (forming device) 7 is provided at the downstream end. The supply means 3 is provided around an outer periphery of the holding furnace 8 and a hopper-shaped holding furnace 8 for storing the molten metal 1 which has been melted and conveyed by a heating device (not shown) provided outside. A heating heater 9 for keeping the temperature of the molten metal 1 in the holding furnace 8 constant, and a heating furnace 9 and a cylinder 2 provided integrally at the bottom of the holding furnace 8.
And a conduit 8a communicating with the
【００１１】さらに、上記温度制御手段４は、シリンダ
２の外周であって、入口部２ａと出口部２ｂとの間の中
間部に軸方向に沿って設けられており、シリンダ２内に
供給された溶融金属１を冷却してシャーベット状になる
ように構成されている。すなわち、保持炉８から供給さ
れた溶湯状態の溶融金属１は、温度制御手段４によって
シリンダ２内で半溶融状態に冷却されることにより、シ
リンダ7の壁面から中心にかけてデンドライトと称する
樹状晶が成長するようになる。一方上記撹拌移送手段５
は、シリンダ２内で回転可能に支持されているスクリュ
１２を備えており、該スクリュ１２はシリンダ２の外部
に設けた回転駆動装置１３によって回転駆動するように
構成されている。スクリュ１２は、円筒状のスクリュ本
体１２ａを備えており、該スクリュ本体１２ａの外周面
部には半溶融金属を撹拌移送する複数本の凸リブ１４が
軸方向へ間隔を開けて配設されている。Further, the temperature control means 4 is provided along the axial direction at the outer periphery of the cylinder 2 and at an intermediate portion between the inlet 2a and the outlet 2b, and is supplied into the cylinder 2. The molten metal 1 is cooled to form a sherbet shape. That is, the molten metal 1 in the molten metal supplied from the holding furnace 8 is cooled to a semi-molten state in the cylinder 2 by the temperature control means 4, so that dendrites called dendrites are formed from the wall surface of the cylinder 7 to the center. To grow. On the other hand, the stirring and transferring means 5
Has a screw 12 rotatably supported in the cylinder 2, and the screw 12 is configured to be rotationally driven by a rotation driving device 13 provided outside the cylinder 2. The screw 12 includes a cylindrical screw main body 12a, and a plurality of convex ribs 14 for stirring and transferring the semi-molten metal are arranged on the outer peripheral surface of the screw main body 12a at intervals in the axial direction. .
【００１２】図３に示すスクリュ１２は、母材が耐熱鋼
で形成してスクリュ１２の軸１２ｂ及び凸リブ１４の表
面には、コーティング層２５が設けられ、コーティング
材としてのＷＣ（タングステンカーバイド）が７０〜８
０ｗｔ％、好ましくは７５％、バインダとしてのＮｉＣ
ｒ（ニッケルクロム）が３０〜２０ｗｔ％、好ましくは
２５ｗｔ％からなる皮膜を溶射法等によって形成する。
コーティング材としては、反応性が低く、コーティング
させた際に被膜割れが生じない材料が使用できる。コー
ティング層２５の厚さは０．１ｍｍ〜０．５ｍｍであ
る。これよりも薄すぎると、耐摩耗性に欠け、均一に付
着していないような場合は、下地の金属が現れるおそれ
があり、それよりも厚いと割れやすく、溶射も困難であ
る。なお、上記のようにシリンダ２の内層管２２に用い
たＳｉ3Ｎ4を溶射することも考えられるが、母材とＳｉ
3Ｎ4の熱膨張差によりセラミックが剥がれてしまった。The screw 12 shown in FIG. 3 has a base material made of heat-resistant steel, and a coating layer 25 is provided on the surface of the shaft 12b and the convex rib 14 of the screw 12, and WC (tungsten carbide) as a coating material is provided. Is 70-8
0 wt%, preferably 75%, NiC as binder
A coating containing 30 to 20 wt%, preferably 25 wt%, of r (nickel chromium) is formed by thermal spraying or the like.
As the coating material, a material which has low reactivity and does not cause film cracking when coated can be used. The thickness of the coating layer 25 is 0.1 mm to 0.5 mm. If the thickness is too thin, the abrasion resistance is poor, and if it is not uniformly adhered, the underlying metal may appear. If it is thicker than that, the metal tends to crack and spraying is difficult. Although it is conceivable to spray Si 3 N 4 used for the inner tube 22 of the cylinder 2 as described above, the base material and the Si 3 N 4 may be sprayed.
Ceramic had peeled by thermal expansion difference 3 N 4.
【００１３】スクリュ１２の基端部は、スクリュ軸１２
ｂを介して回転駆動装置１３と連結されており、シリン
ダ２の上流側端壁にはスクリュ軸１２ｂを挿通させる貫
通孔１５が穿設されている。したがって、シリンダ２及
びスクリュ１２の外部に設けた回転駆動装置（回転駆動
部）１３とシリンダ２の上流側端壁とは、シール手段１
６で気密に仕切られ、このシール手段１６によって当該
貫通孔１５からの溶融金属１の漏れ出し及び空気の巻き
込みを防止している。溶融状態検出手段６は、シリンダ
２の出口部２ｂに設けられており、その検出手段６とし
ては、熱電対等による温度検出手段や、超音波センサに
よる半溶融金属の固相率検出手段がある。The base end of the screw 12 is
The cylinder 2 is connected to the rotary drive device 13 via a b, and a through hole 15 through which the screw shaft 12b is inserted is formed in the upstream end wall of the cylinder 2. Therefore, the rotation driving device (rotation driving unit) 13 provided outside the cylinder 2 and the screw 12 and the upstream end wall of the cylinder 2 are connected to the sealing means 1.
The sealing means 16 prevents the molten metal 1 from leaking out from the through hole 15 and preventing air from being trapped by the sealing means 16. The molten state detecting means 6 is provided at the outlet 2b of the cylinder 2. The detecting means 6 includes a temperature detecting means using a thermocouple or the like, and a solid phase ratio detecting means for semi-molten metal using an ultrasonic sensor.
【００１４】次に、本発明の実施形態に係る溶融金属の
供給装置の作用について説明する。アルミニウム合金等
の半溶融金属を冷却装置７へ連続的に押し出すには、図
１で示す如く、供給手段３の保持炉８内に貯蔵された溶
融金属１を入口部２ａよりシリンダ２内に導管８ａを介
して供給すると共に、回転駆動装置１３によって撹拌移
送手段５のスクリュ１２を回転させる。シリンダ２内に
供給された溶融金属１は、シリンダ２内でスクリュ１２
により撹拌されながら、温度制御手段４にて設定された
３つの冷却ブロア１１を順次経て移送される。Next, the operation of the molten metal supply device according to the embodiment of the present invention will be described. In order to continuously extrude a semi-molten metal such as an aluminum alloy into the cooling device 7, as shown in FIG. 1, the molten metal 1 stored in the holding furnace 8 of the supply means 3 is introduced into the cylinder 2 through the inlet 2 a. The screw 12 of the stirring / transferring means 5 is rotated by the rotation drive device 13 while being supplied through the feeder 8a. The molten metal 1 supplied into the cylinder 2
While being agitated, the liquid is sequentially transferred through the three cooling blowers 11 set by the temperature control means 4.
【００１５】半溶融金属は、スクリュ１２によってシリ
ンダ２の出口部２ｂより冷却装置７側へ連続的に押し出
され、該冷却装置７によってインゴット１８として成形
される。スクリユ１２の凸リブ１４はシリンダ２内に成
長したデンドライト（樹枝状結晶）を粒状に粉砕溝部を
介して移送する工程で攪拌・混合するから移送工程が進
行するに伴い微細な固相合金が溶融合金中に均一に拡散
した状態の半溶融合金が選られる。此れを更に冷却する
と、凝固収縮率が小さく、ひけ巣が少ない高品質の固体
合金を得る。なお、上記インゴット１８は、再加熱によ
り再び半溶融状態にされて図外の射出成形機に搬送さ
れ、所望の合金製品に製造される。この際、シリンダ２
はＳＵＳである外層管２１とＳｉ3Ｎ4である内層管２２
とが熱膨張するがその熱膨張率の違いによる熱膨張差
を、シリンダ２の径方向では、アルミナ繊維及びＳＵＳ
粉を充填した中間層２３が吸収し、シリンダ２の長さ方
向では、アルミナ繊維である緩衝材２４が吸収する。The semi-molten metal is continuously extruded from the outlet 2b of the cylinder 2 toward the cooling device 7 by the screw 12, and is formed as an ingot 18 by the cooling device 7. The convex ribs 14 of the screw 12 are agitated and mixed in the step of transferring the dendrite (dendritic crystals) grown in the cylinder 2 through the pulverizing groove, so that the fine solid alloy is melted as the transfer step proceeds. A semi-molten alloy that is uniformly diffused in the alloy is selected. When this is further cooled, a high-quality solid alloy having a small solidification shrinkage and few shrinkage cavities is obtained. The ingot 18 is again brought into a semi-molten state by reheating, transported to an injection molding machine (not shown), and manufactured into a desired alloy product. At this time, cylinder 2
Is an outer tube 21 made of SUS and an inner tube 22 made of Si 3 N 4
Are thermally expanded, but the difference in thermal expansion due to the difference in the coefficient of thermal expansion is determined by the alumina fiber and SUS in the radial direction of the cylinder 2.
The intermediate layer 23 filled with the powder absorbs, and in the length direction of the cylinder 2, the buffer material 24 which is an alumina fiber absorbs.
【００１６】本発明の供給装置にあっては、シリンダの
内層材をＳｉ3Ｎ4で形成したので、溶融アルミニウムと
シリンダ２との反応が大幅に減少し、鉄の溶出やシリン
ダの減肉が殆どなくなった。Ｓｉ3Ｎ4等のセラミック材
は、高硬度であり耐摩耗性が大きく、使用温度域の約６
００℃では硬さが殆ど低下しないため、シリンダの摩耗
が殆どなくなった。また、スクリュー１２の表面にＷＣ
７０〜８０重量％と残余が３０〜２０重量％のＮｉＣｒ
を溶射してコーティング層２５を形成したので、スクリ
ュ１２と溶融アルミニウムの反応が大幅に減少すること
から、鉄の溶出やスクリュフライト部の減肉が殆どなく
なった。ＷＣ−ＮｉＣｒの溶射被膜は、高硬度で耐摩耗
性が高く使用温度域の約６００℃では硬さが低下が少な
いため、スクリュ１２の摩耗が殆どなくなった。In the supply device of the present invention, since the inner layer material of the cylinder is formed of Si 3 N 4 , the reaction between the molten aluminum and the cylinder 2 is greatly reduced, and the elution of iron and the reduction of the thickness of the cylinder are reduced. Almost gone. Ceramic materials such as Si 3 N 4 have high hardness and high abrasion resistance.
At 00 ° C., the hardness was hardly reduced, and the wear of the cylinder was almost eliminated. In addition, WC is applied to the surface of the screw 12.
70-80 wt% NiCr with a balance of 30-20 wt%
Since the coating layer 25 was formed by thermal spraying, the reaction between the screw 12 and the molten aluminum was greatly reduced, so that elution of iron and thinning of the screw flight portion were almost eliminated. The sprayed coating of WC-NiCr had high hardness and high abrasion resistance, and had a small decrease in hardness at the operating temperature range of about 600 ° C.
【００１７】さらに、ＷＣ−ＮｉＣｒの溶射被膜は、金
属とセラミックの中間的な性質のため、Ａ１２０３等の
セラミック被膜のような熱衝撃等による剥離が少ない。
溶射により被膜を付着させていることからスクリュフラ
イトのような複雑な形状にも全体に亘ってほぼ均一に被
膜を付着することができ、しかも低コストである。その
他、シリンダ１及びスクリュ１２から溶融アルミニウム
中に溶け込む不純物元素が殆どなくなり、合金の清浄度
や機械的性質などの品質を良好に保つことができる。Further, the thermal spray coating of WC-NiCr has a small intermediate property between a metal and a ceramic, and therefore has little peeling due to a thermal shock or the like like a ceramic coating such as A1203.
Since the coating is applied by thermal spraying, it is possible to apply the coating almost uniformly over a complicated shape such as a screw flight, and the cost is low. In addition, almost no impurity element is dissolved into the molten aluminum from the cylinder 1 and the screw 12, and the quality of the alloy, such as cleanliness and mechanical properties, can be kept good.
【００１８】以上、本発明の実施の形態につき述べた
が、本発明は既述の実施の形態に限定されるものではな
く、本発明の要旨を逸脱しない範囲内において種々の変
形及び変更を加え得るものである。なお、スクリュ１２
に溶射したＷＣ−ＮｉＣｒをシリンダ２の内孔に付着さ
せても同様な効果はある。しかしながら、シリンダ２が
長手方向に長いことから、溶射ガンが挿入できるシリン
ダの端部など部分的に溶射することが可能であるが、シ
リンダ２の内孔全体には、溶射ガンが内部に入らず、特
別な溶射ガン等を製造すれば可能である。Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications and changes may be made without departing from the scope of the present invention. What you get. The screw 12
The same effect can be obtained even if WC-NiCr sprayed onto the cylinder 2 is adhered to the inner hole of the cylinder 2. However, since the cylinder 2 is long in the longitudinal direction, it is possible to perform partial thermal spraying such as the end of the cylinder into which the thermal spray gun can be inserted. However, the thermal spray gun does not enter the entire inner hole of the cylinder 2. It is possible if special thermal spray guns are manufactured.
【００１９】[0019]
【発明の効果】以上説明したように、本発明に係る半溶
融金属の供給装置にあっては、シリンダの内層材をＳｉ
3Ｎ4で形成したので、溶融金属とシリンダとの反応が大
幅に減少し、鉄の溶出やシリンダの減肉が殆どなくなっ
た。Ｓｉ3Ｎ4等のセラミック材は、高硬度であり耐摩耗
性が大きく、使用温度域の約６００℃では硬さが殆ど低
下しないため、シリンダの摩耗が殆どなくなった。ま
た、スクリューの表面にＷＣ−ＮｉＣｒを溶射したコー
ティング層を形成したので、スクリュと溶融金属の反応
が大幅に減少することから、鉄の溶出やスクリュフライ
ト部の減肉が殆どなくなった。ＷＣ−ＮｉＣｒの溶射被
膜は、高硬度で耐摩耗性が高く使用温度域の約６００℃
では硬さが低下が少ないため、スクリュの摩耗が殆どな
くなった。したがって、供給装置の寿命を長くするとと
もに、高品質の製品を製造することが可能になる。ま
た、スクリュ１２の材質は、スクリュの母材よりも摩耗
に対する強度が大きく、かつ母材に対して溶融金属より
も反応しにくい材料を使用することができる。As described above, in the apparatus for supplying a semi-molten metal according to the present invention, the inner layer material of the cylinder is made of Si.
3 so formed by N 4, greatly reduced the reaction between the molten metal and the cylinder, thinning of elution and cylinder iron almost disappeared. Ceramic materials such as Si 3 N 4 have high hardness and high abrasion resistance, and hardly decrease in hardness at about 600 ° C. in an operating temperature range, so that wear of the cylinder is almost eliminated. In addition, since a coating layer formed by spraying WC-NiCr on the surface of the screw was formed, the reaction between the screw and the molten metal was significantly reduced, so that elution of iron and thinning of the screw flight portion were almost eliminated. The WC-NiCr thermal spray coating has high hardness and high abrasion resistance, and is approximately 600 ° C. in the operating temperature range.
In this case, the hardness was little reduced, so that the screw was hardly worn. Therefore, it is possible to extend the life of the supply device and to manufacture a high-quality product. Further, as the material of the screw 12, a material having a greater strength against abrasion than the base material of the screw and less responsive to the base material than the molten metal can be used.
【図１】本発明の第１実施形態に係る半溶融金属の供給
装置の構成を示す概念図である。FIG. 1 is a conceptual diagram illustrating a configuration of a semi-molten metal supply device according to a first embodiment of the present invention.
【図２】図１のシリンダを斜視方向から見た断面図であ
る。FIG. 2 is a sectional view of the cylinder of FIG. 1 as viewed from a perspective direction.
【図３】図１のシリンダ内に配設されるスクリュの部分
破断側面図である。FIG. 3 is a partially cutaway side view of a screw provided in the cylinder of FIG. 1;
【図４】従来のシリンダを斜視方向から見た断面図であ
る。FIG. 4 is a sectional view of a conventional cylinder viewed from a perspective direction.
【図５】従来のシリンダ内に配設されるスクリュの部分
破断側面図である。FIG. 5 is a partially cutaway side view of a screw provided in a conventional cylinder.
１ 溶融金属 ２ シリンダ ２ａ 入口部 ２ｂ 出口部 ３ 供給手段 ４ 温度制御手段 ５ 撹拌移送手段 ６ 溶融状態検出手段 ８ 保持炉 ８ａ 導管 ９ 保温ヒータ １０ 加熱ヒータ １１ 冷却ブロア １２ スクリュ １３ 回転駆動装置 １４ 凸リブ １５ 貫通孔 １６ シール手段 ２１ 外層管 ２２ 内層管 ２３ 中間層 ２４ 環状層 ２５ コーティング層 DESCRIPTION OF SYMBOLS 1 Molten metal 2 Cylinder 2a Inlet part 2b Outlet part 3 Supply means 4 Temperature control means 5 Stirring transfer means 6 Melting state detection means 8 Holding furnace 8a Duct 9 Heat retention heater 10 Heater 11 Cooling blower 12 Screw 13 Rotary drive device 14 Convex rib Reference Signs List 15 through hole 16 sealing means 21 outer layer pipe 22 inner layer pipe 23 intermediate layer 24 annular layer 25 coating layer
Claims (6)
ダと、該シリンダ内に設けられ、該シリンダ内の溶融金
属を撹拌しながら排出口側へ連続移送するスクリュとを
備えた溶融金属の供給装置において、 上記シリンダの周壁を異種材料の内層材と外層材とによ
り形成し、該内層材に上記溶融金属に対して上記外層材
よりも反応しにくい材料を用いたことを特徴とする溶融
金属の供給装置。1. A supply of molten metal comprising a cylinder into which molten metal is introduced, and a screw provided in the cylinder and continuously transferring the molten metal in the cylinder to a discharge port side while stirring. In the apparatus, the peripheral wall of the cylinder is formed of an inner layer material and an outer layer material of different materials, and a material less reactive with the molten metal than the outer layer material is used for the inner layer material. Feeder.
形成し、上記外層材をステンレス鋼で形成し、これら内
層材及び外層材間に内外層材の熱膨張差を吸収する緩衝
材を配設したことを特徴とする請求項１に記載の溶融金
属の供給装置。2. An inner layer material of the cylinder is formed of silicon nitride, an outer layer material is formed of stainless steel, and a cushioning material is provided between the inner layer material and the outer layer material to absorb a difference in thermal expansion between the inner and outer layer materials. The molten metal supply device according to claim 1, wherein the molten metal is supplied.
向の熱膨張差を吸収する緩衝材として、アルミナ繊維及
びこれに充填されるステンレス粉を用い、上記シリンダ
の内層材及び外層材の軸方向の熱膨張差を吸収する緩衝
材として、アルミナ繊維を用いたことを特徴とする請求
項２に記載の溶融金属の供給装置。3. An alumina fiber and stainless steel powder filled therein are used as a cushioning material for absorbing a difference in radial thermal expansion between an inner layer material and an outer layer material of the cylinder, and a shaft of the inner layer material and the outer layer material of the cylinder are used. 3. The molten metal supply device according to claim 2, wherein an alumina fiber is used as a buffer material for absorbing a difference in thermal expansion in the directions.
％のタングステンカーバイトと、残余が３０〜２０重量
％のニッケルクロムとからなる溶射膜層を形成したこと
を特徴とする請求項１に記載の溶融金属の供給装置。4. A sprayed film layer comprising 70 to 80% by weight of tungsten carbide and a balance of 30 to 20% by weight of nickel chromium is formed on the surface of the screw. A supply device for the molten metal according to the above.
ダと、該シリンダ内に設けられ、該シリンダ内の溶融金
属を撹拌しながら排出口側へ連続移送するスクリュとを
備えた溶融金属の供給装置において、 上記スクリュの表面に該スクリュの母材よりも摩耗に対
する強度が大きく、かつ上記母材に対して上記溶融金属
よりも反応しにくい材料をコーティングしたことを特徴
とする溶融金属の供給装置。5. A supply of molten metal comprising a cylinder into which molten metal is introduced, and a screw provided in the cylinder and continuously transporting the molten metal in the cylinder to a discharge port side while stirring. An apparatus for supplying a molten metal, wherein a surface of the screw is coated with a material having a greater resistance to abrasion than the base material of the screw and less reactive to the base material than the molten metal. .
％のタングステンカーボンと残余が３０〜２０重量％の
ニッケルクロムからなる溶射膜層であることを特徴とす
る請求項５に記載の溶融金属の供給装置。6. The molten metal coating according to claim 5, wherein said coating material is a sprayed coating layer comprising 70 to 80% by weight of tungsten carbon and a balance of 30 to 20% by weight of nickel chromium. Feeding device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000254936A JP2002066708A (en) | 2000-08-25 | 2000-08-25 | Feeding device of molten metal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000254936A JP2002066708A (en) | 2000-08-25 | 2000-08-25 | Feeding device of molten metal |
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| JP2002066708A true JP2002066708A (en) | 2002-03-05 |
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| JP2000254936A Pending JP2002066708A (en) | 2000-08-25 | 2000-08-25 | Feeding device of molten metal |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007111257A1 (en) * | 2006-03-24 | 2007-10-04 | Toshiba Kikai Kabushiki Kaisha | Melt feed pipe for aluminum die casting |
| US7829138B2 (en) | 2004-03-22 | 2010-11-09 | Toshiba Kikai Kabushiki Kaisha | Metal material for parts of casting machine, molten aluminum alloy-contact member and method for producing them |
| US8333920B2 (en) | 2005-12-02 | 2012-12-18 | Toshiba Kikai Kabushiki Kaisha | Melt supply pipe for aluminum die casting |
| JP2017159313A (en) * | 2016-03-08 | 2017-09-14 | 東芝機械株式会社 | Hot water supply pipe for non-ferrous metal alloy molten metal, hot water pipe assembly and non-ferrous metal casting system |
| CN109530649A (en) * | 2017-09-22 | 2019-03-29 | 株式会社日本制钢所 | The screw rod of metal injection molded molding machine |
| CN115229155A (en) * | 2022-06-07 | 2022-10-25 | 泰州英格伟精密机械有限公司 | Aluminum alloy injection molding device applying metal semi-solid molding technology |
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2000
- 2000-08-25 JP JP2000254936A patent/JP2002066708A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7829138B2 (en) | 2004-03-22 | 2010-11-09 | Toshiba Kikai Kabushiki Kaisha | Metal material for parts of casting machine, molten aluminum alloy-contact member and method for producing them |
| US8349468B2 (en) | 2004-03-22 | 2013-01-08 | Toshiba Kikai Kabushiki Kaisha | Metal material for parts of casting machine, molten aluminum alloy-contact member |
| US8333920B2 (en) | 2005-12-02 | 2012-12-18 | Toshiba Kikai Kabushiki Kaisha | Melt supply pipe for aluminum die casting |
| US8771789B2 (en) | 2005-12-02 | 2014-07-08 | Toshiba Kikai Kabushiki Kaisha | Method for producing melt supply pipe for aluminum die casting |
| WO2007111257A1 (en) * | 2006-03-24 | 2007-10-04 | Toshiba Kikai Kabushiki Kaisha | Melt feed pipe for aluminum die casting |
| JP5015138B2 (en) * | 2006-03-24 | 2012-08-29 | 東芝機械株式会社 | Hot water pipe for aluminum die casting |
| US8580187B2 (en) | 2006-03-24 | 2013-11-12 | Toshiba Kikai Kabushiki Kaisha | Melt supply pipe for aluminum die casting |
| JP2017159313A (en) * | 2016-03-08 | 2017-09-14 | 東芝機械株式会社 | Hot water supply pipe for non-ferrous metal alloy molten metal, hot water pipe assembly and non-ferrous metal casting system |
| US10835953B2 (en) | 2016-03-08 | 2020-11-17 | Toshiba Kikai Kabushiki Kaisha | Molten metal feed pipe for molten nonferrous alloy, assembly of molten metal feed pipes, and nonferrous alloy casting system |
| CN109530649A (en) * | 2017-09-22 | 2019-03-29 | 株式会社日本制钢所 | The screw rod of metal injection molded molding machine |
| CN115229155A (en) * | 2022-06-07 | 2022-10-25 | 泰州英格伟精密机械有限公司 | Aluminum alloy injection molding device applying metal semi-solid molding technology |
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