WO2005084853A1 - Procede de moulage de matiere metallique composite - Google Patents

Procede de moulage de matiere metallique composite Download PDF

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Publication number
WO2005084853A1
WO2005084853A1 PCT/JP2005/001685 JP2005001685W WO2005084853A1 WO 2005084853 A1 WO2005084853 A1 WO 2005084853A1 JP 2005001685 W JP2005001685 W JP 2005001685W WO 2005084853 A1 WO2005084853 A1 WO 2005084853A1
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WIPO (PCT)
Prior art keywords
forming
porous preform
composite
metal
molding
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PCT/JP2005/001685
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English (en)
Japanese (ja)
Inventor
Makoto Fujita
Original Assignee
Central Motor Wheel Co., Ltd.
Priority date (The priority date 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 date listed.)
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Publication date
Application filed by Central Motor Wheel Co., Ltd. filed Critical Central Motor Wheel Co., Ltd.
Publication of WO2005084853A1 publication Critical patent/WO2005084853A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/10—Alloys containing non-metals
    • C22C1/1036—Alloys containing non-metals starting from a melt
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/10—Alloys containing non-metals
    • C22C1/1036—Alloys containing non-metals starting from a melt
    • C22C1/1073—Infiltration or casting under mechanical pressure, e.g. squeeze casting

Definitions

  • the present invention relates to a method of forming a metal composite formed by combining a light metal with a porous preform formed from a predetermined reinforcing material.
  • a metal composite formed by combining a light metal such as aluminum alloy with a reinforcing material having excellent wear resistance and sliding property high! And wear resistance and sliding property are obtained.
  • the required surface required is formed as a composite surface in which the reinforcing material is composited.
  • this metal composite is partially composited with a reinforcing material.
  • a required surface (composite surface) of a cavity formed on a mold for molding the metal composite material a porous preform having a predetermined reinforcing material force formed in advance.
  • a well-known truss forming method in which a molten metal of light metal is pressurized and supplied to the cavity after being placed in contact with a molding die for forming the metal mold.
  • the pressure-supplied molten metal is impregnated into the interior of the porous preform, and the properties of the porous preform are exhibited by bonding the preform and the light metal.
  • the resulting composite surface can be formed.
  • the fiber formed body is used as the porous preform described above, and the fiber formed body is preheated.
  • a method has been proposed which is disposed around a cylinder bore forming core so as to be filled with a molten metal and forged (for example, Patent Document 1).
  • the melt is sufficiently filled in the fiber formed body by preheating the fiber formed body in advance.
  • Patent Document 1 Japanese Patent Application Laid-Open No. 62-6766
  • a mold release material is applied in advance to the surface of the mold forming the cavity to which the molten metal is supplied, thereby preventing seizing between the mold and the molten metal, and after molding And molded articles can be easily separated, and can be molded into a smooth, smooth skin.
  • the mold release material is similarly applied and molded.
  • the composite surface of the metal composite material is molded to a rough, rough skin with irregularities. .
  • the time required for this cutting becomes longer, and the time to replace the cutter also becomes It gets faster.
  • the porous preform is made of ceramic short fibers or ceramic particles
  • the load on the cutter is large, and therefore, the time-consuming cutting process and the early replacement of the cutter are remarkable. It also contributes to an increase in manufacturing time and cost.
  • voids (defects) are present at the composite site of the porous preform and the light metal on the inner side of the composite surface.
  • the metal composite material which can be easily formed can sufficiently exhibit the above-described composite effect, and also has problems of wrinkles and wrinkles.
  • the above-mentioned mold release material it is easily known that a generally well-known particle-force release agent such as titanium-zircoa can be applied with a substantially uniform thickness. !, I have the advantage. However, even if this mold release material is applied to a molding die for forming a composite surface, as described above, the composite surface is molded to have a rough skin.
  • the present invention proposes a method of forming a metal composite material which solves the above-mentioned serious problems and can improve the smoothness of a required surface (composite surface).
  • the present invention relates to a method of forming a metal composite in which a porous preform having a predetermined reinforcing material force is formed on a required surface, the required surface of the porous preform.
  • a mold-releasing material comprising a scaly-shaped composition is applied to a molding surface to be in contact with a molding die for forming a coating, and the porous preform is heated to cover the molding surface.
  • the molding die is brought into contact with the molding surface of the porous preform, and the molten metal of light metal is pressurized and supplied to the back of the porous preform. It is a molding method of the metal composite material to be made into merit.
  • a first molding die for forming a composite surface to which a porous preform having a predetermined reinforcing material force is formed, and the other surface.
  • a mold release material comprising a scaly-shaped composition is applied to a molding surface of the porous preform in contact with the first molding die for forming the composite surface, and the porous preliminary molding is applied.
  • the first molding die After forming a bowl-shaped covering layer covering the molding surface by heating the molding, the first molding die is brought into contact with the molding surface of the porous preform to make the molten metal of the light metal into a cavity.
  • the metal composite characterized in that the pressure is supplied It is in the form method.
  • the molten metal supplied under pressure is preferentially filled so as to easily pass through the relatively large holes, it is present on the molding surface.
  • the molten metal coming through the large holes comes into contact with the molding die in a relatively short time. That is, in each place of the forming surface, a difference occurs in time until the pressure-supplied molten metal contacts the forming die.
  • the porous preform is preheated at a temperature close to the temperature of the molten metal so that the molten metal is easily impregnated, but the molding die is lower in strength than the temperature of the molten metal to prevent seizure with the light metal. Preheated by temperature.
  • the molten metal that has passed through the porous preform is brought into contact with the molding die and solidification is started. Therefore, at a place where relatively large holes are present on the molding surface of the porous preform, the molten metal reaches quickly and solidification occurs rapidly, and the solidification sites of the molten metal are dispersed. Then, the solidification that has occurred in this way proceeds to the periphery and also interferes with the filling of the sequentially supplied molten metal. For this reason, there are also places where the molten metal can not reach the molding die on the surface to be molded, and an uneven scaly surface is formed.
  • the filling may be prevented by the solidified molten metal also in the inside of the porous preformed body, a part where the molten metal does not sufficiently spread may be generated to form a void.
  • a part where the molten metal does not sufficiently spread may be generated to form a void.
  • the mold release material is applied to the molding die in contact with the molding surface, since the temperature of the mold release material is low, a rough surface of the unevenness is similarly formed.
  • the mold release material is applied to the mold, a slight amount of moisture may remain in the mold release because the preheating temperature of the mold is relatively low. This moisture is heated by the high-temperature molten metal to become water vapor, which also results in the formation of voids and surface irregularities.
  • a release material comprising a scaly-shaped composition is applied to the surface to be molded of the porous preform so as not to generate such roughened internal skin and internal voids.
  • the molten metal is pressurized and supplied.
  • the scaly coating layer formed by heating the mold release material composed of scaly-shaped composition adheres so as to close the holes present in the molding surface, and the composition Is present in a disordered state in the scaly coating layer where the water is evaporated.
  • the scaly covering layer is different in the state in which the scaly-shaped composition is irregularly distributed depending on the size of the hole present on the molding surface. That is, where relatively large holes are present, the composition is further disturbed to close the holes, and the voids formed by evaporation of water are also relatively large. Since it is present, it has a thick layer form. On the other hand, in the places where small holes are present, the composition is present in a relatively uniform manner and in the form of a thin-walled layer form with less voids as compared with the large holes. And, such a scaly coating layer is formed in a state in which a scaly-shaped composition is supported on the surface to be molded.
  • this bowl-shaped covering layer is preheated to a temperature substantially close to the temperature of the molten metal together with the porous preform, and comes into contact with the molding die. For this reason, even if the pressure-supplied molten metal is brought into contact with the sheath-like coating layer through the porous preform, the molten metal does not immediately solidify because the sheath-like coating layer is at a high temperature.
  • the pressure-supplied molten metal is first filled through the relatively large holes, the molten metal quickly comes into contact with the bowl-shaped covering layer at the locations of the large holes.
  • the molten metal does not solidify, and is spread and expanded into the preform by the molten metal that is subsequently pressurized and supplied one after another, and the wedge-shaped coating layer is pressed against the molding die.
  • the irregular flake-shaped composition is gradually aligned, and the voids in the layer decrease, and the layer itself is compressed and deformed. It can be Then, when the molten metal comes in contact with the bowl-like coating layer through the gradually smaller holes, it will be compressed and deformed by the same pressing action.
  • the ridge-like covering layer is deformed into a form in which the scaly-shaped composition is overlapped and laminated as a whole, and a substantially uniform layer is formed. It becomes thickness. Therefore, a substantially smooth surface shape can be formed by solidification of the molten metal in pressure contact with the deformed wedge-shaped covering layer.
  • the molten metal to be sequentially pressurized and supplied is sufficiently spread and filled in the porous preformed body. It can be By means of the molten metal charged in this way, the air present in the preform is pushed over the wedge-shaped covering layer. Since this air can escape through the overlapping scaly-shaped composition of the scaly coating layer, the formation of voids (defects) inside is also prevented. In addition, the air inherent in the initial scaly coating layer described above is similarly released by the pressing action of the molten metal.
  • the molding method of the present invention it is possible to mold the required surface (or the composite surface) of the metal composite into a substantially smooth surface and to form voids (defects) inside. Also in the prevention Can. Thus, it is possible to form a metal composite that can sufficiently exhibit the respective excellent properties of the light metal and the porous preform. In addition, even when the cutting process is performed after that, the cutting amount can be reduced compared to the above-described conventional method, and the manufacturing process can be made more efficient.
  • the wedge-like covering layer formed on the surface to be molded can be flexibly absorbed by compressive deformation of the pressing action of the pressure-supplied molten metal?
  • the metal composite can be relatively easily released from the molding die even after the molten metal solidifies.
  • a hollow cylindrical metal composite is formed by an inner first molding die for forming a hollow cylindrical cavity such as the cylinder block described above and an outer second molding die.
  • due to solidification shrinkage of the light metal it is difficult to release the metal composite from the first molding die.
  • the mold-releasing material adhered to the molding die surface can hardly be compressed and deformed.
  • the metal composite material is strongly pressed against the first molding die by the pressing force and solidification contraction force of the molten metal supplied under pressure, and sufficient releasability can not be exhibited.
  • the pressing action and the contraction force of the molten metal are compressed and deformed by the wedge-shaped covering layer. Since it can be relieved, the pressing force on the first molding die can be alleviated, and the metal composite can be released relatively easily.
  • the scaly-shaped composition forming the mold release material is graphite having a scaly shape.
  • a method is proposed in which the scaly-shaped composition is a scaly-shaped boron nitride.
  • graphite and boron nitride are excellent in slidability, they can move relatively easily when subjected to the pressing action of the molten metal, and they will be further aligned and stacked. In order to obtain such a ridge-like covering layer, it is easy to be compressed and deformed and the smoothness is also enhanced.
  • the above-mentioned effects of the present invention can be more appropriately exhibited.
  • the porous preformed body forms a framework.
  • a method is proposed in which the short staple fibers and particles having predetermined properties are sintered.
  • the composite is suitably bonded to the light metal.
  • Such a preform is in the form of coarse and dense porosity since the short fibers are intricately entangled.
  • porous preforms are made, for example, by sintering particles excellent in wear resistance and slidability, which is a weak point of light metals such as aluminum alloys, the porous porosity can be reduced.
  • the metal composite material to be formed by the preformed body strength is excellent in abrasion resistance and sliding property.
  • a mold release material comprising a scaly-shaped composition is applied to the molding surface of the porous preform to be bonded to the required surface of the metal composite, and the porous preform is After forming a bowl-shaped covering layer by heating, the forming surface is brought into contact with a forming mold forming a required surface, and a molten metal of light metal is pressurized and supplied to the back of the porous preform. Molding method.
  • a mold-releasing material having a scaly shape composition is applied to the surface to be molded of the porous preform, and the porous preform is heated to form a scaly coated layer, and then the porous preform is formed.
  • the molding surface is brought into contact with a first molding die for forming a composite surface to which a preform is to be bonded, and a molten metal of light metal is pressurized and supplied to the cavity.
  • a molten metal of light metal is pressurized and supplied to the cavity.
  • the metal composite composited in this manner is characterized by the excellent properties of the light metal and the porous preform respectively. It will be able to fully demonstrate.
  • the amount of cutting can be reduced compared to the above-described conventional method also in the cutting process performed after such forming, it is possible to make the manufacturing process more efficient.
  • the scaly-shaped covering layer is Since it is formed of graphite or boron nitride having excellent slidability, it is easy to be compressed and deformed by the pressing action of the molten metal, and the smoothness is also enhanced, and the above-mentioned effects of the present invention are more appropriately exhibited. It can be done.
  • the porous preform described above is formed by sintering short fibers forming a skeleton and particles having a predetermined property
  • the short fibers forming a skeleton since it can prevent deformation due to the force of the molten metal that impregnates the inside, the porous preform and the light metal can be properly bonded, and the characteristics possessed by the short fibers and the particles can be sufficiently exhibited.
  • the resulting metal composite can be formed.
  • FIG. 1 is an explanatory view showing a step of forming a porous preform 1 according to an embodiment of the present invention.
  • FIG. 2 (B) An enlarged photograph showing the surface morphology of the porous preform 1 and (en) an enlarged photograph showing the surface morphology coated with a release agent obtained by diluting scaly graphite.
  • FIG. 3 is an explanatory view showing a process of tumbling the metal composite 3 of Example 1.
  • FIG. 4 An explanatory view schematically showing a process of impregnating a porous preform 1 with a molten metal 2a to form a composite surface 4 in Example 1.
  • FIG. 5 (B) A magnified image showing the composite surface 4 of Example 1 and (Z) A magnified image showing the composite surface 4 'of the comparative example.
  • FIG. 6 is an explanatory view showing a process of tumbling the metal composite 3 of Example 2.
  • a rectangular solid metal composite 3 formed by bonding a flat plate-shaped porous preform 1 to a required surface (composite surface 4) is formed on an aluminum alloy 2 and the first embodiment
  • a cylindrical porous preform 41 is illustrated for Example 2 in which a cylindrical metal composite 43 formed by bonding to the inner circumferential surface (composite surface 44) is formed.
  • a mold release material comprising a composition having the same scaly shape as in Example 1 is not applied to the porous preform 1, and a molding die is produced.
  • a comparative example applied to 22 is also illustrated.
  • FIG. 1 shows a process of forming a porous preform (so-called preform) 1 according to the present invention.
  • the alumina short fibers 10 and the alumina particles 11 are stirred and mixed in water in a predetermined container 61.
  • alumina sol 12 is added as an inorganic binder to form a mixed aqueous solution 13 in which alumina short fibers 10, alumina particles 11 and alumina sol 12 are mixed almost uniformly.
  • the mixed aqueous solution 13 is transferred from the container 61 to the suction shaper 63.
  • a vacuum pump (not shown) is connected to the suction shaper 63, and as shown in FIG.
  • the water in the mixed aqueous solution 13 is sucked by the vacuum pump through the filter 64.
  • a preformed body 14 is obtained in which the alumina particles 11 are substantially uniformly dispersed in the alumina short fibers 10 and pseudo-bonded.
  • this preformed body 14 is removed from the suction forming device 63. Take out and dry in a drying oven maintained at about 120 ° C. to remove water sufficiently (not shown).
  • the volume content of the alumina short fibers 10 is about 12%
  • the volume content of the alumina particles 11 is about 10%
  • the remaining region is a void.
  • the above-mentioned mixed aqueous solution 13 is prepared so as to obtain such a volume content rate.
  • this preformed body 14 was placed on a table 66 in a heating furnace 65, and the inside of the furnace was heated to about 1000 ° C. and held for one hour. Thereafter, furnace cooling (not shown) to room temperature was performed to obtain a porous preform 1 having a flat plate shape.
  • the porous preform 1 molded in this manner is formed by combining the alumina short fibers 10 and alumina particles 11 which form a complex intertwining frame, It has a so-called porous form in which sites (relatively large pores) and dense sites (relatively small pores) are mixed.
  • the water-soluble scale-like graphite 8 (see FIG. 2 (mouth), see FIG. 4) is diluted about twice with water to form a release material (not shown) according to the present invention.
  • Hitzole 242B (manufactured by Hitachi) is used as the scaly graphite.
  • This mold release material is applied to the molding surface 5 of the porous preform 1 to form a required surface (hereinafter referred to as a composite surface) 4 formed by combining the porous preform 1 and the aluminum alloy 2 described above. Apply Then, it is dried in a drying oven maintained at about 120 ° C to remove water sufficiently (not shown).
  • a drying oven maintained at about 120 ° C to remove water sufficiently (not shown).
  • a scale-like coating layer 6 in which scale-like graphite 8 is randomly present is formed on the surface to be formed. Furthermore, this scaly coating layer 6 has an internal void formed after the evaporation of water (see FIG. 4 (i)).
  • the randomness of the scale-like graphite 8 is high and a large number of voids are present, and the layer thickness is thick.
  • the scaly graphite 8 is in a relatively gathered state, and the thickness of the layer with few gaps is thin (see FIG. 4 (i)). It can be said that such a scaly covering layer 6 is formed in a state in which scaly graphite 8 is supported on the molding surface 5 of the porous preform 1.
  • the porous preform 1 has a flat plate shape of about 40 mm ⁇ about 40 mm and about 10 mm in thickness. And as a result of measuring a weight after the said drying, it is an increase of about lg, and this is the adhesion amount of scale-like graphite 8. Thereafter, the porous preform 1 having the bowl-shaped covering layer 6 formed on the molding surface 5 is subjected to a predetermined preheating furnace (not shown). Exposed to a high temperature atmosphere and preheat to about 600 ° C. At this time, the wedge-shaped covering layer 6 is also preheated to about 600.degree. In the present embodiment, after the release material is applied, it is once dried in a drying furnace and weight measurement is performed, but it is also possible to carry out preheating directly in a preheating furnace without performing this. A similar scaly covering layer 6 can be formed.
  • the porous preform 1 preheated by the preheating furnace is immediately placed at a predetermined position of the mold 20 for forming the metal composite 3 of the desired shape as shown in FIG.
  • the mold 20 is a substantially hollow rectangular parallelepiped outer frame mold 21 whose inner four sides are inclined surfaces which are respectively directed downward from above and inclined inward, and the lower part of the outer frame mold 21. It consists of a mold 22 which is fitted and forms the composite surface 4 and a insert 23 which is fitted inside the outer frame mold 21 and whose inner four sides are vertical surfaces.
  • the insert 23 is divided into right and left, and when it is taken out from the outer frame mold 21, it is divided and the metal composite 3 formed on the inside is easily released. It has become possible.
  • Such a mold 20 preheats the outer frame mold 21 to about 300 ° C. and preheats the mold 22 and the insert 23 to about 200 ° C. before the porous preform 1 is placed. It will A mold release material is applied to the inner vertical surface of the insert 23 in advance. This release material may be any of those obtained by diluting the scaly graphite described above or a release material composed of another general particulate composition.
  • the preheated porous preform 1 is placed on the molding die 22 with the molding surface 5 facing downward (FIG. 3 (B)).
  • the surface to be molded 5 is in contact with the molding die 22 through the ridge-like coating layer 6 (see FIG. 2 (opening)) applied to the surface to be molded 5.
  • a predetermined amount of molten metal 2a of aluminum alloy (JIS AC 4 CH alloy) heated to about 760 ° C. is formed in cavity 25 formed by insert 23 and forming die 22. Drain.
  • the pressing element 24 which has a substantially flat surface and which can be inserted into the cavity 25 is provided by a hydraulic press machine not shown.
  • the upper force molten metal 2a is pressed directly at a pressure of 50 MPa.
  • the molten metal 2a is pressurized and supplied in this manner, the inside of the porous preform 1 is gradually impregnated.
  • the composite alloy portion 7 in which the porous preform 1 and the aluminum alloy 2 are composite-bonded, and the aluminum alloy 2 are integrally formed.
  • Metal Composite 3 is obtained.
  • the composite surface 4 formed by combining the porous preform 1 and the aluminum alloy 2 is, as shown in FIG.
  • the molten metal 2a in contact with the bowl-shaped covering layer 6 is pushed and spread around by the molten metal 2a which is sequentially pressurized and supplied, and is filled into the preform 1 and is later pressurized.
  • the wedge-shaped covering layer 6 is pressed against the forming die 22 by the pressing action of the supplied molten metal 2 a.
  • the scaly graphites 8 are gradually aligned so as to gradually overlap each other at the portion of the scaly coating layer 6 which has received the pressing action of the molten metal 2 a,
  • the air contained therein flows out to the outside through the surface of the molding die 22 so that the space is reduced and the layer itself is compressed and deformed.
  • the molten metal 2a is gradually supplied to the dense portion of the porous preform 1 by pressure feeding so that the molten metal 2a is in contact with the bowl-shaped covering layer 6 over the entire area of the molding surface 5. I will. Then, as the bowl-shaped covering layer 6 and the molten metal 2a come into contact with each other, they are compressed and deformed in the same manner as described above, and the entire region of the bowl-shaped covering layer 6 is compressed and deformed.
  • this compressive deformation causes the thick portion of the bowl-like covering layer 6 to be greatly compressed and deformed by the relatively large pressing action at the rough portion, and the thin portion by the relatively small pressing action at the dense field position. It will be made small compression deformation.
  • the scale-like coating layer 6 is compressed and deformed into a generally uniform layer thickness in which the scale-like graphites 8 are laminated in a uniform manner. Therefore, the molten metal 2a in pressure contact with the weir-like coating layer 6 solidifies, whereby a substantially smooth composite surface 4 is formed.
  • the air remaining in the porous preformed body 1 has a ridge-like covering layer formed by the molten metal 2a.
  • the mixture is pressed to 6 and flows to the surface of the molding die 22 through between the flaky graphite (not shown) constituting the scale-like coating layer 6 and flows out to the outside.
  • the flaky graphite not shown
  • the bowl-shaped coating layer 6 can be flexibly absorbed by compressively deforming the pressing action of the molten metal 2a. Since it is possible, the molding die 22 and the molten metal 2a can be shielded reliably. Therefore, the composite surface 4 in which the porous preform 1 and the aluminum alloy 2 are combined so that the aluminum alloy 2 is not seized on the forming die 22 can be relatively easily released from the forming die 22. it can. From this point on as well, the smoothness of the composite surface 4 is maintained.
  • a mold release material obtained by diluting the scaly graphite as in Example 1 is applied to the surface of the molding die 22 to which the molding surface 5 contacts, and the molten metal 2a
  • the metal composite is formed by pressure supply (see Figures 1 and 3). That is, the porous preform 1 is formed in the same manner as in Example 1 described above, and the molded surface 5 of the porous preform 1 is not coated with a release material obtained by diluting scaly graphite (see FIG. 2) Preheat to about 600 ° C.
  • the mold release material is applied to the surface of the molding die 22 on which the composite surface of the metal composite is to be formed (not shown).
  • the coating amount of the release agent is made to be substantially the same as that of the above-mentioned Example 1.
  • the mold 22 is preheated at about 200 ° C. to form a substantially smooth ridge-like covering layer covering the mold 22.
  • a cavity 25 is formed by the forming die 22 and the outer frame die 21 and the insert 23 which are each preheated.
  • the molten metal 2a of the aluminum alloy 2 is poured, and the molten metal 2a is also directly pressed by the pressing element 24 in the upward direction.
  • the molten metal 2a is pressurized and supplied to impregnate the porous preform 1 with the molten metal 2a.
  • a metal composite material 3 formed by integrally forming an aluminum alloy 2 and a composite site where the porous preform 1 and the aluminum alloy 2 are composited is obtained. obtain.
  • the release material obtained by diluting scaly graphite is not applied to the surface to be molded 5 of the porous preform 1 but applied to the molding die 22.
  • the molding is performed in the same manner as in Example 1 described above, and the same reference numerals and descriptions are omitted.
  • a composite surface 4 ′ formed by combining the porous preform 1 and the aluminum alloy 2 is as shown in FIG. With rough skin on the ground became.
  • this composite surface 4 ' is compared with the composite surface 4 (Fig. 5 (i)) of the metal composite 3 of Example 1 described above, it can be seen that the bald surface of the composite surface 4' of the comparative example is rough.
  • the molten metal 2a of the aluminum alloy 2 is pressure-supplied and impregnated into the porous preform 1 and / or passes quickly through the rough part of the porous preform 1 in the course of the process.
  • the asperity shape is formed, and the complex surface 4 'of roughened persimmon skin is to be formed. Also, in this way, on the surface to be molded, if solidification proceeds more quickly than in the interior, a void may be contained in the porous preform 1. In the case of the composite part formed in this manner, the effects such as strength improvement and wear resistance improvement by the composite of the porous preform 1 and the aluminum alloy 2 are not sufficiently exhibited.
  • the metal composite 43 is molded (see FIG. 6).
  • a hollow cylindrical porous preform 41 is molded by the same molding method as in Example 1 described above (see FIG. 1).
  • the inner peripheral surface of this porous preformed body 41 is a molding surface 45 forming the composite surface 44 of the metal composite 43.
  • a composite gauze portion 47 in which a porous preformed body 41 and the aluminum-um alloy 2 are composited is formed on the inner side in the cylindrical diameter direction. It is assumed that aluminum alloy 2 is integrally formed on the outside (Fig. 6 (2)).
  • this embodiment 2 is the same as the above-described embodiment except that the hollow cylindrical metal composite 43 having the composite surface 44 combined with the porous preform 41 on the inner peripheral surface is formed.
  • This is the same shaping method as in Example 1, and in the same process, symbols and explanations are appropriately omitted.
  • Example 2 a mixed solution 13 in which alumina short fibers 10, alumina particles 11 and alumina sol 12 are substantially homogeneously mixed is drawn into a cylindrical storage tank in which a cylindrical core is disposed at the center thereof. Then, a hollow cylindrical preform is obtained by suction with a vacuum pump (see FIG. 1). Then, when the preform is dried in a drying furnace, the volume fraction of alumina short fibers 10 is about 12%, and the volume fraction of alumina particles 11 is about 12 as in Example 1 described above. It is 10%. Thereafter, this preform was sintered by heating at about 1000 ° C. for one hour to obtain a hollow cylindrical porous preform 41 (see FIG. 6).
  • the porous preformed body 41 has a tapered shape in which the outer peripheral surface is substantially straight and the inner peripheral surface is inclined by about 0.5 degrees. Then, it is molded to have a height of about 80 mm, an outer diameter of about 80 mm, and a minimum inner diameter of about 70 mm.
  • a mold release material obtained by diluting scaly graphite as in Example 1 described above is applied, and Remove moisture thoroughly in a drying oven held at ° C and dry.
  • a scaly covering layer (not shown) formed by overlapping scaly graphite on top of the molding surface 45 is formed (see FIG. 2 (opening), FIG. 4).
  • the scaly coated layer is formed in a state in which the scaly graphite is scattered differently depending on the rough and dense form of the molding surface 45 as in the first embodiment described above.
  • the adhesion amount of scaly graphite was about 2 g.
  • the porous preformed body 41 is preheated to about 600 ° C. in a preheating furnace as in the above-mentioned Example 1.
  • the cavity 55 forming the hollow cylindrical metal composite 43 has an internal structure as shown in FIG.
  • An outer frame mold 51 having an inner peripheral inclined surface which inclines inward from the upper side to the lower side on the side, and the lower end of the outer frame mold 51 are fitted to one open end face of the metal composite 43
  • a lower mold 52 to be formed a nest 53 having a vertical surface internally fitted to the outer frame mold 51 and forming an outer peripheral surface of the metal composite 43 inside, and detachable from the center of the lower mold 52
  • It is comprised of a core 56 which is arranged and has an outer peripheral surface with a taper angle which is directed upwards and inclined inwards.
  • the core 56 is formed such that the upper outer diameter is about 70 mm and the taper angle of the outer peripheral surface is about 0.5 degree, and the porous preform 41 described above is externally fitted by a slightly provided tolerance. It is possible.
  • the nest 53 is divided into right and left as described above.
  • the core 56 in contact with the molding surface 45 of the porous preform 41 is the first molding die according to the present invention, and the insert 53 and the lower die 52 are the second molding die. is there.
  • the outer frame mold 51, the lower mold 52, and the insert 53 described above are preheated to about 300 ° C. before the porous preform 1 is placed, and the core 56 is about 200 °. Preheat to C.
  • a mold release material is applied in advance to the surface of the lower mold 52 and the insert 53 on which the cavity 55 is to be formed.
  • the preheated porous preform 41 is immediately fitted on the core 56 and placed in the center of the lower mold 52 as shown in FIG. This results in the porous preform 45 being placed within the cavity 55.
  • the porous preform 41 is not in contact with the inner circumferential surface of the insert 53 and is disposed inside the cavity 55.
  • a predetermined amount of molten metal 2a of aluminum alloy (JIS AC 4 CH alloy) heated to about 760 ° C. is poured into this cavity 55, as shown in FIG.
  • the pressure applied to the inner side of the insert 52 by the pressure of about 50 MPa also directly presses the upward force of the molten metal 2a.
  • the molten metal 2a is gradually impregnated into the porous preformed body 41 by pressure supply of the molten metal 2a. Then, after cooling in this state, it is taken out, and on the inner peripheral side, a composite metal portion 47 where the porous preform 41 and the aluminum alloy 2 are complexed, and the aluminum alloy 2 hardened on the outer side.
  • the composite surface 44 is formed to have a substantially smooth skin as in Example 1 described above (see FIG. 5 (c)). )reference). This is because, as shown in Example 1, a gauze-like object formed on the molding surface 45 of the porous preform 41. This is because the coating layer is compressed and deformed by the pressing action of the pressure-supplied molten metal 2a, so that an effect that can form a substantially smooth composite surface 44 can be exhibited (see FIG. 4).
  • the core is generally removed because the molten aluminum alloy supplied into the cavity shrinks and deforms in the cooling process. difficult.
  • the load required to extract the core 56 (hereinafter referred to as the extraction load) was measured.
  • a mold release material in which flake graphite is diluted is not applied to the molding surface 45, and an outer surface of the core 56 is coated with a mold release material having a general particle shape.
  • a metal composite was formed, and the unloading load of the core 56 was measured.
  • the removal load of the core 56 is about 70% as compared with the case where the release agent composed of the particle shape of the particle is applied. It has fallen.
  • the mold release layer formed by the adhesion of the mold release agent applied to the outer peripheral surface of the core 56 can hardly be compressed and deformed.
  • the metal composite is strongly pressed against the core 56 by the pressing force of the metal and the solidification contraction force of the molten metal.
  • Example 2 in which the present invention works as described above, since the wedge-shaped covering layer can be compressed and deformed, the pressing force and the contraction force of the molten metal can be relaxed.
  • the force applied to the core 56 is reduced as compared to the above.
  • the metal composite can be removed relatively easily. Therefore, in order to facilitate mold removal, it is necessary to increase the taper angle of the outer peripheral surface of the core, and to use the method of cutting after molding, etc. to reduce the time and cost required for the molding process. Is also possible.
  • the porous preform is formed by sintering alumina short fibers and alumina particles, but in addition, shorts such as metal fibers, ceramic fibers, carbon fibers, etc. Even in the case of using fibers and particles such as ceramic particles and metal particles, and porous metals, etc., the effects and advantages of the present invention can be appropriately exhibited.
  • the method of forming the metal composite material of the present invention by high pressure structure, die casting, gas pressure structure, etc. It can be suitably used in various methods for filling.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
  • Mold Materials And Core Materials (AREA)

Abstract

La présente invention a trait à un procédé de moulage de matière métallique composite capable d'accroître le caractère lisse de sa surface déterminée (surface composite) assemblée à un article poreux de moulage préliminaire. Dans le procédé de moulage de la matière métallique composite (3) un matériau de démoulage formé d'une composition en forme d'écailles est appliqué à la surface moulée (5) de l'article poreux de moulage préliminaire (1) et l'article poreux de moulage préliminaire (1) est chauffé pour former une couche de revêtement en forme d'écailles (6), la surface moulée (5) est mise en contact avec la matrice de moulage (22) formant une surface déterminée (ou surface composte (4)) assemblée à l'article poreux de moulage préliminaire (1), et le métal en fusion (2a) d'un métal léger est alimenté lors d'une mise sous pression. Ainsi, la surface déterminée (ou surface composite (4)) présentant une surface de coulée lisse peut être formée, en évitant la formation de vides dans la matière, et le métal léger et l'article poreux de moulage préliminaire peuvent développer leur excellentes propriétés dans la matière métallique composite (3).
PCT/JP2005/001685 2004-02-09 2005-02-04 Procede de moulage de matiere metallique composite WO2005084853A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2004-031589 2004-02-09
JP2004031589A JP4291705B2 (ja) 2004-02-09 2004-02-09 金属複合材の成形方法

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09295102A (ja) * 1996-05-07 1997-11-18 Nippon Light Metal Co Ltd 金型鋳造用離型剤及びそれを用いた軽金属金型鋳造法
JP2002224814A (ja) * 2001-02-05 2002-08-13 Mazda Motor Corp 予備成形体と軽合金との複合方法及びそれに用いる予備成形体

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11277217A (ja) * 1998-01-19 1999-10-12 Mitsubishi Materials Corp 放熱用基板およびその製造方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09295102A (ja) * 1996-05-07 1997-11-18 Nippon Light Metal Co Ltd 金型鋳造用離型剤及びそれを用いた軽金属金型鋳造法
JP2002224814A (ja) * 2001-02-05 2002-08-13 Mazda Motor Corp 予備成形体と軽合金との複合方法及びそれに用いる予備成形体

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