Abstract: Provided is an aluminum alloy diecast that can be unlikely to crack at a part to be press-fitted while the proof stress of a main body part is being secured, and can eliminate the need for heat treatment to the main body part at the time of production. The aluminum alloy diecast (11) includes a part to be press-fitted (13) into which a joining member (20) is press-fitted and a main body part (14) in which the part to be press-fitted (13) is integrally formed, in which an average hardness of the part to be press-fitted (13) is lower than an average hardness of the main body part (14) or an average roundness of crystals other than a primary crystal of Al in the part to be press-fitted (13) is larger than an average roundness of crystals other than a primary crystal of Al in the main body part (14).

Abstract: A manufacturing method for joined bodies that allows galvanic corrosion to be reduced is provided. The method is for manufacturing a joined body obtained by joining together a mating member made of ferrous metal and a non-ferrous metal material. The method includes: a press fit step of press-fitting a joining element made of ferrous metal into a predetermined surface of the non-ferrous metal material; and a welding step of forming a melted portion between an exposed portion of the joining element press-fitted into the non-ferrous metal material and the mating member. After the press fit step, a part of the joining element is exposed from the predetermined surface and the remaining part of the joining element is not exposed and is buried in the non-ferrous metal material. The remaining part of the joining element includes a lodging portion having a surface facing to the predetermined surface.

Abstract: A projection of burr is provided by forming an appropriate gap to set a cast-in member to a cast-in mold, completely closing the gap when the cast-in mold is clamped, and correcting cast-in positioning (axis mating) to a die-cast component by a clamping operation of the die-cast mold, regardless of a dimensional precision of the cast-in member upon a manufacture. Steel plate cast-in member 2, wrapped cast except for a bonding portion 2b to a steel plate bonding member 3 upon molding a die-cast component 1, has a mold contact portion 4 at a boundary between a cast-in portion 2a wrapped cast with a die-cast component 1 and the bonding portion 2b. When a cast-in mold A is clamped, the mold contact portion 4 is brought into butting contact with the cast-in mold A, gap S between the cast-in member 2 and the cast-in mold A, cavity a, is closed.

Abstract: An object of the present invention is to surely provide a projection of burr by forming an appropriate gap needed to set a cast-in member to a cast-in mold, and by completely closing the gap when the cast-in mold is clamped, and to correct a cast-in positioning (axis mating) to a die-cast component by a clamping operation of the die-cast mold, regardless of a dimensional precision of the cast-in member upon a manufacture. A steel plate cast-in member 2, which is wrapped cast except for a bonding portion 2b to a steel plate bonding member 3 upon molding a die-cast component 1, has a mold contact portion 4 at a boundary between a cast-in portion 2a wrapped cast with a die-cast component 1 and the bonding portion 2b. When a cast-in mold A is clamped, the mold contact portion 4 is brought into intimate butting contact with the cast-in mold A, whereby a gap S between the cast-in member 2 and the cast-in mold A, i.e., a cavity a, is closed. Thus, a projection of burr is prevented.

Abstract: An object of the present invention is to surely provide a projection of burr by forming an appropriate gap needed to set a cast-in member to a cast-in mold, and by completely closing the gap when the cast-in mold is clamped, and to correct a cast-in positioning (axis mating) to a die-cast component by a clamping operation of the die-cast mold, regardless of a dimensional precision of the cast-in member upon a manufacture. A steel plate cast-in member 2, which is wrapped cast except for a bonding portion 2b to a steel plate bonding member 3 upon molding a die-cast component 1, has a mold contact portion A at a boundary between a cast-in portion 2a wrapped cast with a die-cast component 1 and the bonding portion 2b. When a cast-in mold A is clamped, the mold contact portion 4 is brought into intimate butting contact with the cast-in mold A, whereby a gap S between the cast-in member 2 and the cast-in mold A, i.e., a cavity is closed. Thus, a projection of burr is prevented.

Abstract: A welding method of carrying out an alternating current arc welding by switching polarities of a voltage applied between a wire and workpieces when weld-connecting the workpieces to each other by use of the wire, the workpieces including an aluminum cast material and an aluminum wrought material. In the welding method, the alternating current arc welding is carried out in a way to satisfy |B|/(A+|B|)?0.128 where A denotes an integrated value of an electric current over a time for which the polarity of the wire is positive, and B denotes an integrated value of an electric current over a time for which the polarity of the wire is negative; and thereby an amount of heat input into the aluminum cast material during the welding is set at not more than 67.8 J/mm2.

Abstract: Disclosed is a welding method of carrying out an alternating current arc welding by switching polarities of a voltage applied between a wire 7 and workpieces when weld-connecting the workpieces to each other by use of the wire 7, the workpieces including an aluminum cast material 1 and an aluminum wrought material 3. In the welding method, the alternating current arc welding is carried out in a way to satisfy |B|/(A+|B|)?0.128 where A denotes an integrated value of an electric current over a time for which the polarity of the wire 7 is positive, and B denotes an integrated value of an electric current over a time for which the polarity of the wire 7 is negative; and thereby an amount of heat input into the aluminum cast material 1 during the welding is set at not more than 67.8 J/mm2.

Abstract: By determining an amount of a metal to be prepared into a slurry in its liquid state, thereafter applying a motion to the melted metal via a mechanical or physical means when at least a part of the melted metal reaches a temperature below the liquidus temperature and cooling the melted metal in a slurry preparing container to prepare the melted metal into a metal slurry in a semi-solid state, and by concurrently making the semi-solid metal slurry in the slurry preparing container with a shape to be kept almost unchanged, and feeding the semi-solid metal slurry in a state wherein the shape is nearly kept as it is into the shot sleeve/prechamber of the part making machine, a semi-solid metal slurry with the non-dendritic (spherical) primary crystal particles being fine and almost uniform can be fed into the part making machine, with no need of any specifically complex process but with a simple system and plain equipment. Thus, a shaped part with high quality can be produced.

Abstract: An intermediate material is formed by coating at least a half of the surface of a function selecting material having at least one of physical property values that are different from those of a casting metal material forming a cast product with a coating metal material and the casting metal material is cast together with the intermediate material to form a composite body in casting the product.

Abstract: By determining an amount of a metal to be prepared into a slurry in its liquid state, thereafter applying a motion to the melted metal via a mechanical or physical means when at least a part of the melted metal reaches a temperature below the liquidus temperature and cooling the melted metal in a slurry preparing container to prepare the melted metal into a metal slurry in a semi-solid state, and by concurrently making the semi-solid metal slurry in the slurry preparing container with a shape to be kept almost unchanged, and feeding the semi-solid metal slurry in a state wherein the shape is nearly kept as it is into the shot sleeve/prechamber of the part making machine, a semi-solid metal slurry with the non-dendritic (spherical) primary crystal particles being fine and almost uniform can be fed into the part making machine, with no need of any specifically complex process but with a simple system and plain equipment. Thus, a shaped part with high quality can be produced.

Abstract: By determining an amount of a metal to be prepared into a slurry in its liquid state, thereafter applying a motion to the melted metal via a mechanical or physical means when at least a part of the melted metal reaches a temperature below the liquidus temperature and cooling the melted metal in a slurry preparing container to prepare the melted metal into a metal slurry in a semi-solid state, and by concurrently making the semi-solid metal slurry in the slurry preparing container with a shape to be kept almost unchanged, and feeding the semi-solid metal slurry in a state wherein the shape is nearly kept as it is into the shot sleeve/prechamber of the part making machine, a semi-solid metal slurry with the non-dendritic (spherical) primary crystal particles being fine and almost uniform can be fed into the part making machine, with no need of any specifically complex process but with a simple system and plain equipment. Thus, a shaped part with high quality can be produced.

Abstract: An intermediate material is formed by coating at least a half of the surface of a function selecting material having at least one of physical property values that are different from those of a casting metal material forming a cast product with a coating metal material and the casting metal material is cast together with the intermediate material to form a composite body in casting the product.

Abstract: The device includes a cavity defined by a fixed die and a movable die; a plunger disposed in a runner connected to the cavity in such a manner as to be movable to and from a gate of the cavity; a molten metal inlet formed midway in the runner; wherein molten metal supplied from the molten metal inlet in the cavity is pressurized by the advance of the plunger. This die device further includes an auxiliary die unit having a runner and a molten metal inlet connected to the cavity, which is disposed in a border of the fixed die; wherein excessive solidified metal is produced in the vicinity of the molten metal inlet of the auxiliary die unit.

Abstract: This invention provides a die casting method comprising the steps of that a pulverized insulation agent is coated to form a porous insulation layer on the interior surface of die cavity when a casting products are made by utilizing a die casting machine, wherein a molten metal is filled into the cavity with a slow pace thereon, a high pressure is applied upon the molten metal mechanically so as to crush and make thin the porous insulation layer pressed by the high pressurization upon the molten metal, simultaneously the molten metal sinks into and passes through the porous insulation layer to reach at the interior surface of the cavity wherein the molten metal is rapidly solidified to produce a final casting products according to the temperature drop due to the direct contact with the interior surface of the cavity.

Abstract: Molten metal is prevented from cooling too quickly when supplied to an injection sleeve of a casting device by applying a heat insulating powder onto an inner surface of the injection sleeve between each supply of molten metal. The heat insulating powder can be applied to the inner surface of the injection sleeve by way of an electrostatic field created between an electrode which has been inserted into the injection sleeve and the injection sleeve itself.