JPH0910893A - Apparatus for producing metal for half melt molding - Google Patents

Abstract

PURPOSE: To obtain a metal for half melt molding dispersed with primary crystals in a liquid phase by holding the metal in which crystal nuclei are generated by contact of molten metal with a jig for cooling while cooling the metal down to the molding temp. of a solid-liquid coexistence state by a heat insulated vessel. CONSTITUTION: The surface temp. of the jig 1 for cooling is kept lower than the m.p. of a molten alloy and the molten allay held at an excess heat degree of about <300 deg.C with respect to a liquidus temp. is poured onto the top end of the jig 1 for cooling of a nucleus forming section 10. The flowing down molten alloy is housed into the heat insulated vessel 22 where the molten alloy is held for about 5 seconds to 60 minutes at the temp. below the liquidus temp. and higher than the eutectic temp. or solidus temp. The extremely fine and isotropic dendrite-like primary crystals are formed in the molten allay from the crystal nuclei and grow as spheroidal primary crystals with an increase in the solid phase rate as the temp. of the melt falls. These spheroidal primary crystals are formed at a prescribed liquid phase rate. The half molten metal dispersed with the extremely fine primary crystals suitable for half melt molding in the liquid phase is extremely easily obtd. in such a manner.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for producing a metal for semi-melt forming, and particularly to a metal for semi-melt forming in which fine primary crystals suitable for semi-melt forming are dispersed in a liquid phase very easily and easily. The present invention relates to a manufacturing device.

[0002]

2. Description of the Related Art The thixocasting method has attracted attention recently because of its advantages such as less casting defects and segregation, uniform metal structure, longer die life and shorter molding cycle than the conventional casting method. Is a semi-melt molding technology. The billet used in this molding method (A) is characterized by a spheroidized structure obtained by performing mechanical stirring or electromagnetic stirring in the semi-melting temperature region, or by utilizing recrystallization after processing. Is. On the other hand, a method of semi-solid molding using a material obtained by a conventional casting method is also known.
This is, for example, a method (B) of adding Zr or a method (C) of using a carbon-based refiner in order to generate finer crystals in a Magne alloy which is likely to generate an equiaxed crystal structure. This is a method (D) in which an Al-5% Ti-1% B mother alloy is added as a refining agent in an aluminum alloy in an amount of about 2 to 10 times that of a conventional method (D). In this method, the primary crystals are made spherical by heating and molding. Also, for alloys within the solid solubility limit, after heating relatively quickly to a temperature near the solidus, the material exceeds the solidus in order to equalize the temperature of the entire material and prevent local melting. A method (E) of forming by heating gently to an appropriate temperature at which the material is softened is known. On the other hand, unlike the method of heating the billet to the semi-melting temperature range and molding,
A rheocast method (F) is known in which a melt containing spherical primary crystals is continuously generated by mechanical stirring, electromagnetic stirring, or the like, and is directly solidified as a billet without being solidified.

[0003]

However, the above-mentioned method (A) is complicated in both cases of the stirring method and the method of utilizing recrystallization, and there is a drawback that the manufacturing cost becomes high. Further, in the case of (B), in the case of the magnet alloy, Z
In the method (C), since the r is high and the cost is a problem, in order to sufficiently exert the refining effect by using the carbide-based refining agent, Be, which is an antioxidant element, is
It is necessary to control the concentration to be about 7 ppm, which is oxidative and combustible during the heat treatment immediately before molding, which is inconvenient for work. On the other hand, in the case of an aluminum alloy, it is about 500 μm just by adding a refiner, and it is not easy to obtain a fine grain structure of 100 μm or less. For this reason, there is a method (D) in which a large amount of the finely-dividing agent is added, but the finely-dividing agent is liable to settle on the furnace bottom and is industrially difficult, and the cost is high. Further, in the method (E), a thixo-molding method characterized by uniform heating and spheroidization of the material by gradually heating after exceeding the solidus line has been proposed. However, it does not change into the thixo structure (the primary dendrite is spheroidized). Moreover (A)
In any of the thixomolding methods (1) to (E), in order to perform semi-melt molding, it is necessary to once solidify the liquid phase and raise the billet again to a semi-melt temperature range in a high frequency induction furnace or the like. The cost is higher than. Also, (F)
In this method, since a melt containing spherical primary crystals is continuously generated and supplied, it is more advantageous in terms of cost and energy than thixocasting, but a machine for producing a metal raw material composed of a spherical structure and a liquid phase. It is difficult to interlock the equipment because the difference in processing capacity between the casting machine and the casting machine that manufactures the final product may occur. The present invention focuses on the problems of each of the above-mentioned conventional methods, and easily and easily without using a billet and without taking a complicated method, a fine primary crystal suitable for semi-melt molding is in the liquid phase. An object of the present invention is to provide an apparatus for producing a semi-molten metal suitable for dispersed semi-melt forming.

[0004]

In order to solve the above-mentioned problems, the present invention provides, in the first invention, an apparatus for producing a metal for semi-melt forming in which fine primary crystals are dispersed in a liquid phase. , A nucleation part for bringing the molten metal into contact with a cooling jig to generate crystal nuclei in the liquid, and the metal obtained by the nucleation part can be held while being cooled to a molding temperature in a solid-liquid coexisting state. And a crystal production unit having a heat insulating container. Further, in the second invention, the cooling jig of the nucleation section in the first invention is provided with a pair of left and right weirs provided with a flow passage through which a cooling medium passes inside and arranged along the flow direction of the molten metal. Was an inclined flat plate having an upper surface, or a cylindrical tube or a semi-cylindrical tube. Further, in the third invention, the cooling jig of the nucleation part in the first invention is a funnel tube which is rotatable by a stationary or rotary driving means. And 4th invention WHEREIN: 1st-3rd invention WHEREIN: The holding | maintenance part which suspends the heat insulation container of a crystal | crystallization production | generation part is arrange | positioned in the outer peripheral part at a substantially equal space | interval, and is horizontally rotatable about a vertical axis. In addition to a disk and a rotation driving means for the horizontal disk, an elevating means for lifting the heat insulating container suspended in one place of the fertilizer and a moving means for transferring the lifted heat insulating container,
In addition, a tilting means of the heat insulating container for tilting the heat insulating container, which is suspended on the holding portion of the horizontal disk and is poured through the cooling jig through the cooling jig, at an arbitrary inclination angle, is provided.

[0005]

In the present invention, a molten alloy having a superheat degree of less than 300 ° C. with respect to the liquidus temperature is poured into a cooling jig of the nucleation part to cool it below the melting point of the alloy. While being brought into contact with a jig to generate crystal nuclei in the liquid, the crystal nuclei are poured into the heat insulating container of the crystal forming part, cooled and cooled to near the molding temperature, and then transferred to a molding device for molding. Therefore, a semi-molten metal in which fine primary crystals suitable for semi-melt molding are dispersed in a liquid phase can be obtained very simply and easily without taking a complicated method.

[0006]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 10 relate to an embodiment of the present invention, and FIG. 1 is a side view of a semi-melt forming metal manufacturing apparatus 100,
FIG. 2 is a perspective view of the cooling jig 1 that constitutes the nucleation unit 10,
3 is a lateral sectional view of a cooling jig 1A showing another embodiment, FIG. 4 is a side sectional view of a cooling jig 1C (funnel tube) showing another embodiment, and FIG. 5 is another embodiment. FIG. 6 is an overall plan view of the semi-melt forming metal manufacturing apparatus 100A shown in FIG. 6, FIG. 6 is a vertical sectional view taken along line AA of FIG. 5, FIG. 7 is a vertical sectional view taken along line BB of FIG. 5, and FIG. 9 is a vertical cross-sectional view, FIG. 9 is a process explanatory view illustrating a method for producing a metal for semi-melt molding, and FIG. 10 is a copy of a micrograph showing a metal structure of a molded product. Further, FIG. 11 is a copy of a micrograph of a metal structure (comparative example) of a molded product obtained by pouring and cooling the molten metal directly into a heat insulating container without passing through the nucleation part.

As shown in FIG. 1, a semi-molten metal forming manufacturing apparatus 100 comprises a nucleation section 10 and a crystal generation section 20. The nucleation section 10 has a pair of left and right on the upper surface of an inclined copper flat plate. A cooling jig 1 provided with a projecting weir 2, a stand 3 for holding it in an inclined state, and a cooling pipe 4 connected to a flow path for passing a cooling medium (usually cooling water) inside the cooling jig 1 ( Injection tube 4a and return tube 4b), while the crystal forming part 20 holds the molten metal obtained by the nucleation part 10 while cooling it to the forming temperature in the solid-liquid coexisting state, thereby forming fine crystals. And is formed by a heat insulating container 22 which serves as a container for the molten metal M poured after the cooling jig 1 has flowed down. Insulation container 2
2, if necessary, as shown in FIG.
It is assumed that it is housed inside and is rigidly held by being bolted with a lid plate 25, and as will be described later, a hanging tool 24a formed of a pair of left and right round steels on the side surface of the metal container 24 for the convenience of transportation. Is projected. When a metal flat plate such as a copper flat plate is used as the cooling jig 1, a non-metallic coating agent such as BN is applied to the surface of the metal cooling plate in order to prevent the molten metal from adhering to the cooling plate. Care should be taken to make the leaking property worse by applying it. The weir 2 is provided to control the flow state of the molten metal flowing on the upper surface of the cooling jig 1.

FIG. 3 shows an example in which a cooling jig 1A made up of a cylindrical tube and a cooling jig 1B made up of a semi-cylindrical tube are adopted as cooling jigs. Similarly to the cooling jig 1 for the flat plate made of copper, the cooling medium flow path 5 and the cooling pipe 4 (the injection pipe 4a and the return pipe 4b) are provided.

On the other hand, an example in which a funnel tube is used as a cooling jig is shown in FIG. 4, and the cooling jig 1C in this case is placed in the lower portion after pouring the molten metal M in a stationary state. You may make it fall to the heat-insulated container 22 which was covered,
In order to enhance the cooling effect, the cooling jig 1C may be rotatably supported by the thrust bearing 1b on the pedestal 1a, and injected while rotating at a low speed by the reduction motor 1f through the spur gears 1e and 1d. .

In the semi-melt forming metal producing apparatus 100 having the above-described structure, in order to obtain the semi-melt forming metal, first, the cooling jig 1 (or 1A, 1A, 1A) of the nucleation section 10 is obtained.
B, 1C) to the upper end of the liquidus temperature to 30 degrees
The alloy melt kept below 0 ° C. is poured and allowed to flow down. At this time, the surface temperature of the cooling jig 1 is kept at a temperature lower than the melting point of this alloy. Then, the molten alloy that has flowed down the cooling jig 1 (or 1A, 1B, 1C) is gently stored in the heat insulating container 22, and within the heat insulating container 22, the temperature is lower than the liquidus temperature and the eutectic temperature or the solid phase. By keeping the temperature higher than the line temperature for 5 seconds to 60 minutes,
A large number of fine spherical primary crystals are generated and molded at a predetermined liquid phase ratio. Here, the predetermined liquid phase ratio means the amount ratio of the liquid phase suitable for pressure molding, and the liquid phase ratio is 20% to 90%, preferably 30% to in high pressure casting such as die casting and squeeze casting. 70% (If less than 30%, the moldability of the material is poor,
If it is 70% or more, not only is it difficult to handle because the material is soft, it is difficult to obtain a uniform structure.) In the extrusion method or forging method, 0.1% to 70%, preferably 0.1%
-50% (50% or more may cause nonuniformity of the structure). Further, the heat insulating container 22 in the present invention means
A metal container or a non-metal container, or a metal container whose surface is coated with a non-metal material containing a semiconductor, or a metal container in which a non-metal material containing a semiconductor is combined, and the inside of the container Alternatively, the container can be heated or cooled from the outside.

Specifically, the work proceeds according to the following procedure. In step [2], the metal M, which is a complete liquid, put in the ladle 150 in step [1] of FIG. (Also adding an accelerating element) to generate crystal nuclei and pour into a heat insulating container 22 having a heat insulating effect, or
(B) A low-temperature molten metal immediately above the melting point containing the microstructure generation promoting element is directly poured into the heat insulating container 22 having a heat insulating effect to obtain an alloy immediately below the liquidus line containing a large number of crystal nuclei. Next, in step [3], the alloy is held in the semi-molten state in the heat insulating container 22. During this period, an extremely fine and isotropic primary crystal of dentrite as shown in FIG. 10 is generated from the introduced crystal nuclei ([3] -a), and the solid fraction increases as the temperature of the melt decreases. As a result, spherical primary crystals grow ([3] -c). If the molten metal is simply poured into the heat insulating container 22 without passing through the nucleation unit 10, only a slightly sharp and coarse dendrite structure as shown in FIG. 11 can be obtained. The metal M having a predetermined liquid phase ratio thus obtained is inserted into the die-casting injection sleeve 40 as shown in [3] -d, and then pressure-molded in the die cavity 50a of the die casting machine. To obtain a molded product.

The difference between the present invention shown in FIGS. 1, 2, 3 and 4 and the conventional thixocasting method and rheocasting method is clear from the drawings. That is, in the present invention, unlike the conventional method, dendrite-like primary crystals crystallized in the semi-melting temperature region are not crushed into spherical particles by force by mechanical stirring or electromagnetic stirring, and crystals introduced into the liquid A large number of primary crystals that crystallize and grow with a decrease in temperature in the semi-melting temperature region starting from the nucleus (depending on the need, may be heated and held externally) continuously This is an extremely simple method because it is spheroidized and the step of semi-melting by reheating the billet in the thixocast method is omitted.

Casting conditions, spheroidizing conditions and molding conditions set in each of the above-mentioned processes, namely, the process of pouring into the cooling jig 1 shown in FIG. 1, the production of primary crystals, the spherical process, and the molding process. The reason for limiting the numerical value indicated by will be described below. When the casting temperature is higher than the melting point by 300 ° C. or higher, or when the surface temperature of the cooling jig 1 is higher than the melting point, (1) the generation of crystal nuclei is small, and (2) a heat insulating container having a heat insulating effect. Since the temperature of the molten metal M when it is poured into the liquid is higher than the liquidus, the proportion of remaining crystal nuclei is low,
The size of the primary crystals increases. Therefore, the casting temperature is set so that the degree of superheat with respect to the liquidus is less than 300 ° C., and the surface temperature of the cooling jig 1 is lower than the melting point of the alloy. A finer primary crystal size is obtained by setting the superheat degree to the liquidus below 100 ° C. and by lowering the temperature of the cooling jig 1 by 50 ° C. or more below the melting point of the alloy M. You can As a method of bringing the molten metal M into contact with the cooling jig 1, a method of moving the molten metal M on the surface of the jig (flowing the molten metal to the inclined jig 1) and a case of moving the cooling jig 1 in the molten metal In the embodiment of the present invention (FIGS. 1 to 3), the molten metal M is applied to the stationary cooling jigs 1, 1A, 1B.
In the cooling jig 1C of FIG. 4, the cooling efficiency is improved by pouring the molten metal M while rotating the cooling jig 1C (funnel tube) in addition to being stationary. Further, the cooling holding time in the heat insulating container 22 in the crystal forming part 20 is set to 5 seconds to 60 minutes, but if the holding time in the heat insulating container 22 is less than 5 seconds, the temperature showing the desired liquid phase rate is obtained. Is not easy, and it is difficult to generate spherical primary crystals. On the other hand, if the holding time exceeds 60 minutes, the generated spherical primary crystals and eutectic structure become coarse and the mechanical properties deteriorate.
Therefore, the holding time is 5 seconds to 60 minutes.

As described above, the holding time in the heat insulating container 22 varies over a wide range from 5 seconds to 60 minutes depending on the cooling time to the molding temperature, and when the holding time is long such as 10 minutes to 60 minutes, One nucleation unit 10 (cooling jig 1) for one crystal generation unit 20 (heat insulation container 2)
The production apparatus of the combination of 2) has remarkably low productivity.
This metal melting apparatus 100A for semi-molten forming solves this problem and improves productivity by avoiding production loss during cooling waiting time.
Is shown in FIG. In FIG. 5, the semi-melt forming metal manufacturing apparatus 100A includes a plurality of heat insulating containers 22 on the outer circumference.
The rotating disk (turntable) 60 is formed by a horizontal disk that has a gripping portion that can suspend the rotating disk 62 and is rotatable around a central rotating shaft 62. On the side surface of the metal container 24 accommodating the heat insulating container 22, as shown in FIG. 8, the hangers 24a and 24a formed of a pair of left and right round steels are welded in a state of horizontally protruding, Notches having a semicircular shape that is slightly larger than the diameter of the metal container 24 are provided on the outer peripheral portion of the rotating disk (turntable) 60 at approximately equal intervals, and a semicircular shape for mounting the suspenders 24a, 24a. A hanger receiver 30a made of a pipe is horizontally extended and fixed, and a metal container 24 integrated with the heat insulating container 22 is suspended as shown in FIG.

As shown in FIG. 5, the heat insulating container 22 suspended on the rotating disk (turntable) 60 thus constructed is poured through the cooling jig 1 on the left side, and is cooled at a low speed. It is transferred to a rotating disk (turntable) 60 which rotates at a temperature of 60 ° C., and after a lapse of a predetermined cooling time, it is rotated to a right position rotated by 180 ° C. At this right position, as shown in FIG. 6, an elevating means (hydraulic cylinder) 26 for the heat insulating container 22 such as a hydraulic cylinder is installed below the heat insulating suspending position of the turntable 60 to push up the bottom surface of the heat insulating container 22. Insulation container 2 which acts and is attached to injection sleeve 40 in the next step
After transferring 2, the metal melt in a semi-solidified state inside is supplied. Further, as shown in FIG. 7, when the molten metal is directly poured into the heat insulating container 22 which is upright from the cooling jig 1, air entrainment may occur, which may cause casting defects. It is desirable to tilt it so that the side wall of the heat insulating container 22 is transmitted and the molten metal is gently poured. Therefore, a pressing means (hydraulic cylinder) 28 such as a hydraulic cylinder having a piston rod 28a to which a rotatable pressing plate 28b supported by a pin at the tip is attached,
It is installed below the cooling jig 1. The metal manufacturing apparatus for semi-melt molding 1A configured as described above includes a plurality of heat insulation containers 2
Since the molten metal can be sequentially supplied to the injection sleeve by sequentially performing the processes of 2, ..., As compared with the case of the single heat insulating container 22, a waiting time for cooling is not required, and a decrease in productivity can be prevented.

As described above, in the metal-making apparatus 100 or 100A for semi-melt forming of the present invention, fine primary crystals suitable for semi-melt forming are dispersed in the liquid phase, and non-metallic inclusions are not mixed. No semi-molten metal can be obtained. Moreover, since the surface of semi-molten metal is hard to be oxidized because it is held and cooled in a heat-insulating container, and the temperature distribution inside the metal is very good, it is usually molded in semi-melt molding. The high frequency furnace used to heat the material is not needed in most alloys. The side of the container that is held by a robot or a dedicated machine and contacts the surface of the injection chip in the injection sleeve 40 of the die cast (including the squeeze casting machine) of the metal in the heat-insulated container 22 that has reached a predetermined molding temperature. If the metal is inserted with the upper end facing to, semi-molten molding can be performed, and a high-quality cast material having a structure having fine spherical primary crystals as shown in FIG. 10 can be obtained. However, if the molten metal is simply poured into the heat insulating container 22 without passing through the nucleation unit 10, only coarse dendrites with a slight angle as shown in FIG. 11 can be obtained. The semi-molten metal produced by the apparatus of the present invention may be subjected to a pressure molding method other than die casting, or may be gently inserted into a sand mold or a metal mold without being pressurized. In the above example, a copper flat plate having a cooling means inside was used as the means for generating nuclei, but it is sufficient if it can prevent crystal nuclei from being generated and, further, re-dissolve. Can be applied.

Instead of attaching the weir 2, as described above, a cylindrical or arc-shaped cooling jig 1A as shown in FIG.
It is also possible to use 1B. Further, as shown in FIG. 4, a conical cooling jig 1 rotated by a driving means.
After pouring the molten metal into C to generate crystal nuclei, the molten metal can be poured into the heat insulating container 22 from below. The material of the cooling jig 1 is not limited to metal as long as it is cooled within a predetermined time and contains a nucleus. Further, in the above-described embodiment, a heat insulating ceramic container is used as the crystal generating means, and in other embodiments of the present invention, the rotary turntable 60 in which a large number of the containers 22 can be arranged is used. The arrangement and the fixing method are not limited to this, and they may be arranged linearly or by other methods, and the fixing method can be positioned at a predetermined position, for example, as shown in FIG. Alternatively, the heat insulating container 22 may be placed in a metal container 24 having an inner diameter slightly larger than the diameter of the heat insulating container 22, the bottom surface may be pressed if necessary, and the heat insulating container 22 may be lifted and lowered by a lifting means 26 such as a hydraulic cylinder. . Although the nucleation part and the crystal formation part are separated in the present invention, both steps can be combined. For example, nucleation and crystal formation may be performed by using a cooling jig or a molten surface vibrating jig for the molten metal in the heat insulating container 22.

[0018]

As is apparent from the above description, in the apparatus for producing a metal for semi-melt forming according to the present invention,
An adiabatic container capable of holding the molten metal while cooling it to the forming temperature in the solid-liquid coexisting state by bringing the molten metal into contact with a cooling jig to generate crystal nuclei in the liquid and the metal obtained by the nucleation part By providing a crystal-forming part having, the semi-molten metal in which fine primary crystals suitable for semi-melt molding are dispersed in the liquid phase can be produced very simply and easily without taking a complicated method. Specifically, 1) no complicated device such as mechanical stirring or electromagnetic stirring is required. 2) In order to obtain a semi-molten metal suitable for molding in a heat-insulating container, it is necessary to prepare only an amount necessary for molding. Since it is possible, there is no problem with trouble in the subsequent molding process. 3) No expensive high-frequency superheater is required to raise the temperature to the semi-melt molding temperature.
4) The temperature distribution of the metal material is good because it is held in a heat-insulating container before the semi-melt molding, it hardly oxidizes, and there is almost no temperature drop immediately before the molding of the metal material. 5) The heat insulation before the semi-melt molding Being held in a container,
A temperature suitable for molding can be achieved regardless of the liquid phase ratio of the metal material. 6) There are various excellent effects such that the metal or scrap other than the product part of the cast product obtained from the semi-molten metal can be easily used as a raw material of the semi-molten metal by remelting.

[Brief description of the drawings]

FIG. 1 is a side view of a semi-melt forming metal manufacturing apparatus according to an embodiment of the present invention.

FIG. 2 is a perspective view of a cooling jig constituting a nucleation part of the semi-melt forming metal manufacturing apparatus according to the embodiment of the present invention.

FIG. 3 is a cross-sectional view of a cooling jig that constitutes a nucleation unit of a semi-melt forming metal manufacturing apparatus according to another embodiment of the present invention.

FIG. 4 is a side sectional view of a cooling jig that constitutes a nucleation unit of a semi-melt forming metal manufacturing apparatus according to another embodiment of the present invention.

FIG. 5 is an overall plan view of a semi-melt forming metal manufacturing apparatus showing another embodiment of the present invention.

6 is a vertical cross-sectional view taken along the line AA of FIG.

FIG. 7 is a vertical cross-sectional view taken along the line BB of FIG.

FIG. 8 is a vertical cross-sectional view of a heat insulating container according to an embodiment of the present invention.

FIG. 9 is an explanatory process diagram illustrating a method for producing a metal for semi-solid forming according to the present invention.

FIG. 10 is a copy of a micrograph showing a metal structure of a molded product according to the present invention.

FIG. 11 is a copy of a micrograph showing a metal structure of a comparative example according to the present invention.

[Explanation of symbols]

 1 Cooling Jig 1A Cooling Jig 1B Cooling Jig 1C Cooling Jig (Leak Half Pipe) 1a Pedestal 1b Thrust Bearing 1d Spur Gear 1e Spur Gear 1f Reducer Motor 2 Weir 3 Stand 4 Cooling Pipe 4a Cooling Pipe ( Injection pipe 4b Cooling pipe (return pipe) 5 Cooling medium flow path 10 Nucleation part 20 Crystal generation part 22 Thermal insulation container 24 Metal container 26 Elevating means (hydraulic cylinder) 28 Pressing means (hydraulic cylinder) 28a Piston rod 28b Pressing plate 40 Injection sleeve 50 Mold 50a Mold cavity 60 Rotating disk (turntable) 62 Rotating shaft 100 Semi-melt forming metal manufacturing apparatus 100A Semi-melt forming metal manufacturing apparatus 150 Ladle

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[Procedure amendment]

[Submission date] June 24, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction contents]

Specifically, the work proceeds according to the following procedure. In step [2], the metal M, which is a complete liquid, put in the ladle 150 in step [1] of FIG. (Also adding an accelerating element) to generate crystal nuclei and pour into a heat insulating container 22 having a heat insulating effect, or
(B) A low-temperature molten metal immediately above the melting point containing the microstructure generation promoting element is directly poured into the heat insulating container 22 having a heat insulating effect to obtain an alloy immediately below the liquidus line containing a large number of crystal nuclei. Next, in step [3], the alloy is held in the semi-molten state in the heat insulating container 22. During this time, as shown in isotropic 10 in very fine from the introduced crystal nuclei de
A ndrite- shaped primary crystal is formed ([3] -a), and grows as a spherical primary crystal as the solid fraction increases with the temperature decrease of the melt ([3] -c). If the molten metal is simply poured into the heat insulating container 22 without passing through the nucleation unit 10, only a slightly sharp and coarse dendrite structure as shown in FIG. 11 can be obtained. The metal M having a predetermined liquid phase ratio thus obtained is inserted into the die-casting injection sleeve 40 as shown in [3] -d, and then pressure-molded in the die cavity 50a of the die casting machine. To obtain a molded product.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0015

[Correction method] Change

[Correction contents]

As shown in FIG. 5, the heat insulating container 22 suspended on the rotating disk (turntable) 60 thus constructed is poured through the cooling jig 1 on the left side, and is cooled at a low speed. It is transferred to a rotating disk (turntable) 60 which rotates at a temperature of 60 ° C., and after a lapse of a predetermined cooling time, it is rotated to a right position rotated by 180 ° C. At this right position, as shown in FIG. 6, an elevating means (hydraulic cylinder) 26 for the heat insulating container 22 such as a hydraulic cylinder is installed below the heat insulating suspending position of the turntable 60 to push up the bottom surface of the heat insulating container 22. Insulation container 2 which acts and is attached to injection sleeve 40 in the next step
After transferring 2, the metal melt in a semi-solidified state inside is supplied. Further, as shown in FIG. 7, when the molten metal is directly poured into the heat insulating container 22 which is upright from the cooling jig 1, air entrainment may occur, which may cause casting defects. It is desirable to tilt it so that the side wall of the heat insulating container 22 is transmitted and the molten metal is gently poured. Therefore, a pressing means (hydraulic cylinder) 28 such as a hydraulic cylinder having a piston rod 28a to which a rotatable pressing plate 28b supported by a pin at the tip is attached,
It is installed below the cooling jig 1. More thixoforming metal production apparatus 1 00 A configured as described above, a plurality of heat insulating container 22, ... can be supplied successively semi molten metal continuous processing to the injection sleeve to a single adiabatic Compared with the container 22, the cooling waiting time is not required, and the productivity can be prevented from lowering.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tatsuo Sakamoto 1980, Okiyama, Ogushi, Ube, Yamaguchi Prefecture Ube Machinery Co., Ltd.

Claims (4)

[Claims] 1. A device for producing a semi-melt forming metal in which fine primary crystals are dispersed in a liquid phase, which comprises a nucleation unit for bringing a molten metal into contact with a cooling jig to generate crystal nuclei in the liquid. And a crystal forming part having a heat insulating container capable of holding the metal obtained by the nucleation part while cooling it to a forming temperature in a solid-liquid coexisting state. apparatus. 2. A slanting flat plate having a pair of left and right weirs provided on the upper surface of the cooling jig of the nucleation section, the flow path through which a cooling medium passes being disposed, and being provided along the flow direction of the molten metal. Or
The apparatus for producing a metal for semi-melt forming according to claim 1, which is a cylindrical tube or a semi-cylindrical tube. 3. The apparatus for producing a metal for semi-melt forming according to claim 1, wherein the cooling jig of the nucleation part is a funnel tube which is stationary or rotatable by a rotary drive means. 4. A horizontal disc rotatable around a vertical axis, which is provided with a plurality of gripping portions for suspending a heat-insulating container of a crystal production unit at an outer peripheral portion at substantially equal intervals, and a rotation driving means for the horizontal disc. And a moving means for transferring the lifted heat-insulating container and a means for transferring the lifted heat-insulating container, the cooling jig being suspended on the grip of the horizontal disk. The apparatus for producing a metal for semi-melt forming according to claim 1, further comprising tilting means of the heat insulating container for tilting the heat insulating container poured through the tool at an arbitrary tilt angle during pouring.