JP3848936B2 - Semi-melt forming method and molding machine for low melting point metal alloy - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
This invention uses a low melting point metal alloy such as a magnesium alloy or aluminum alloy having thixotropic properties in which the solidified structure is crystallized into a fine solid phase in advance as a molding material, which is injected and filled into a mold in a semi-molten state. The present invention relates to a molding method and a molding machine for metal products.
[0002]
[Prior art]
In conventional semi-melt molding, a cooled and solidified billet of an aluminum alloy or magnesium alloy is heated to a temperature range exceeding the solidus and held until the primary crystal is granulated, and then molded below the liquidus The temperature is further raised to a temperature to achieve a semi-molten state, which is supplied to a molding die and pressure-molded (see, for example, Patent Document 1).
Also, the molten magnesium alloy is cooled to produce a metal slurry containing a solid phase, and the metal slurry is cooled and solidified to form a cylindrical rod-shaped metal material, which is heated and melted in a semi-molten state by an injection device. Some products are injection-molded (see, for example, Patent Document 2).
[0003]
As a metal forming machine, a heating unit is provided on the outer periphery of a cylindrical body having a nozzle member at the tip, and a melting cylinder provided with an injection plunger in a movable manner is inclined, and a granular shape supplied from a hopper by the melting cylinder is provided. There is one in which a low melting point metal material is completely dissolved and injected into a mold (for example, see Patent Document 3).
[0004]
As a low melting point metal product manufacturing equipment, a low melting point metal rod-shaped material is melted in a melting furnace, and the molten metal is stirred and sheared with a screw in a cylinder maintained at a temperature higher than the solidus temperature and lower than the liquidus temperature. In some cases, it is stored in the front part of the plunger and injected into the mold by the plunger (for example, see Patent Document 4).
[0005]
[Patent Document 1]
Japanese Patent No. 3216684 (page 1-3, FIG. 1).
[Patent Document 2]
JP 2001-252759 A (page 4-5, FIG. 1).
[Patent Document 3]
JP 2001-191162 A (page 3-5, FIGS. 1 and 6).
[Patent Document 4]
JP-A-7-51824 (page 5-8, FIG. 1-2).
[0006]
[Problems to be solved by the invention]
The semi-melt molding method described in Patent Document 1 requires that the cooled and solidified billet is heated to a temperature range exceeding the solidus and held for 5 to 60 minutes until the primary crystal is granulated. Even if it can be applied when casting large metal products that take a long time to form by die-casting, the molding efficiency of the metal product with small product weight by injection molding will decrease due to its holding time. Have problems that are difficult to adopt.
[0007]
In the molding method described in Patent Document 2, a metal slurry containing a solid phase is cooled and solidified to form a cylindrical rod-shaped metal material that potentially holds thixotropy, which is semi-molten by a heating chamber of an injection device. Since the molten molten slurry is stored in a state and the semi-molten metal slurry is supplied to the mold for molding, the holding time until the primary crystal, which is the subject of Cited Document 1, is granulated becomes unnecessary. However, both melting and storage of the metal material are performed in the heating chamber, and the discharge port is located above the preliminary melting barrel, so the supply of the semi-molten metal slurry to the mold is not performed in the melting order, and the heating is performed. Some metal slurries remain in the chamber for a long time and the solid phase becomes coarse, and the thixotropic properties are lost systematically.This increases with the lapse of operating time and is mixed with the metal slurry supplied to the mold. And has a new problem of adversely affecting metal products.
[0008]
In the metal forming machine of Patent Document 3 described above, both melting and storage of the granular molding material are performed in the melting cylinder, but the melting cylinder is inclined and the molten metal is stored in its lower part, and the lowest molten metal From the injection filling into the mold and the granular material falls and melts on the molten metal, the injection filling into the mold is performed in the order of dissolution, there is nothing that stays long, but there From the structure, the molding material cannot be dissolved and stored separately.
[0009]
In the above cited reference 4, the material ingot is melted by a melting furnace, and the molten metal is supplied to a cylinder maintained at a temperature equal to or higher than the solidus temperature and equal to or lower than the liquidus temperature. This is because the molten metal has thixotropic properties. If a molding material having thixotropic properties is semi-melted and stirred and sheared with a screw in advance, the growth of the solid phase is promoted and the thixotropic properties are lost. Therefore, it is difficult to adopt for semi-melt molding of a low melting metal alloy.
[0010]
An object of the present invention is to provide a molding material of a semi-melt molding method using a solid of a low melting point metal alloy (for example, a magnesium alloy, an aluminum alloy, etc.) having thixotropic properties whose solid phase is crystallized into fine particles. By performing melting and storage separately, a new molding method capable of obtaining a metal product having a solidified structure with ease of injection molding and a preferable thixotropic property, and a metal molding machine described in Patent Document 3 above It is to provide a new semi-melt molding machine by improvement.
[0011]
[Means for Solving the Problems]
The semi-melt molding method of the present invention according to the above object uses a solid of a low melting point metal alloy having a thixotropic property whose solid phase is crystallized in a fine granular form as a molding material, and the solid material has a nozzle at the tip and has an inside. In a melt cylinder communicating with a melt holding cylinder equipped with an injection plunger, the metal slurry was melted into a semi-molten metal slurry having thixotropic properties in a solid-liquid coexistence state, and the metal slurry was maintained at a solid-liquid coexistence temperature in the melting order. The molten metal is allowed to flow down into the melt-holding cylinder and kept warm, and the product mold is injected and filled by the forward movement of the injection plunger within the time during which the thixotropic property is maintained by the melt-holding cylinder.
[0012]
The solid molding material is made of a solid material such as a chip-shaped granule, a rod, or an ingot, and the molding material is melted and the semi-molten metal slurry is kept warm in an inert gas atmosphere such as argon gas. That's it.
[0013]
A semi-molten molding machine of the present invention has a nozzle member at the tip, a melting holding cylinder having an injection plunger that can be moved forward and backward, an injection cylinder at the rear of the melting holding cylinder that moves the injection plunger forward and backward, and a melting holding A metal slurry of a low-melting-point metal alloy having thixotropic properties in the cylinder, a heating means around the outer periphery of the cylinder that holds the solid-liquid coexistence state, and an outflow path having a diameter smaller than the inner diameter of the cylinder at the closed end of the cylinder, A melting cylinder standing up in the upper part of the melting holding cylinder with the outflow path on the lower side, and a low melting point metal alloy having thixotropic properties in which the solid phase in the melting cylinder is crystallized into fine particles It consists of a heating means around the outside of the cylinder that melts the granular material into the metal slurry in the solid-liquid coexistence state, and a hopper with a feed screw inside that is connected to the top end of the melting cylinder.
[0014]
Further, the semi-melt molding machine has a nozzle member at the tip, and an injection plunger is provided in the inside thereof so that the injection plunger can be moved forward and backward, and a melt holding cylinder provided with heating means on the outer periphery of the cylinder, and a rear portion of the melt holding cylinder that moves the injection plunger forward and backward Injection cylinder, heating means for holding the metal slurry of the low melting point metal alloy having thixotropic properties in the melt holding cylinder in a solid-liquid coexistence state, and a diameter smaller than the cylinder inner diameter at the closed end of the cylinder And a thixotropic property in which the solid phase in the melting cylinder is crystallized into fine particles. The low melting point metal alloy rod-shaped material having a melting point is composed of a heating means around the outer periphery of the cylinder that melts into the metal slurry in a solid-liquid coexistence state, and a supply cylinder that is connected to the upper opening of the melting cylinder.
[0015]
Further, any of the above-mentioned semi-melt molding machines has an inert gas injection tube such as argon gas in the upper space from the lower part of the melting cylinder to the inner surface of the melt-holding cylinder. It is.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
In the figure, reference numeral 1 denotes an injection mechanism of a semi-melt molding machine using a solid of a low melting point metal alloy having a thixotropic property crystallized into a fine solid phase as a molding material, and has a nozzle member 22 at the tip of a cylindrical body 21. It consists of a melt holding cylinder 2 of a semi-molten metal slurry, a molding material melting supply device 3 standing on the melting holding cylinder 2, and an injection cylinder 4 at the rear of the melting holding cylinder. A mold clamping mechanism 5 for the mold 6 is installed on the upper surface of the machine base 7 together with the injection mechanism 1.
[0017]
The solid molding material with thixotropic properties, whose solid phase is crystallized into fine particles, is a low-melting metal alloy solution, and a semi-molten material with thixotropic properties as the solid phase in the solid-liquid coexistence temperature region is finely granulated. And the semi-molten product was produced by cooling and solidifying.
[0018]
Reference numeral 8 denotes a receiving base for the injection mechanism 1, which has a nozzle touch block 9 having a hot runner on the tip, and a pair of left and right plates 10a whose upper edges are inclined inwardly at an angle of about 45 ° at the rear. The support 10 of the melting holding cylinder 2 and the support 41 of the injection cylinder 4 are inserted through the support shaft 12 into the support 10 so that the injection mechanism 1 faces downward with respect to the mold clamping mechanism 5. The nozzle member 22 at the tip is nozzle-touched to the upper corner of the nozzle touch block 9.
[0019]
Reference numeral 13 denotes a nozzle touch device for the melt holding cylinder 2, a side hydraulic cylinder 13 a provided across the cylinder support 23 of the melt holding cylinder 2 and the support 41 of the injection cylinder 4, and a bearing on the side of the nozzle touch block 9. And a rod 13b having a tip pivotally attached thereto.
[0020]
Reference numeral 14 denotes a nozzle touch device for the injection cylinder 15 mounted horizontally on the front surface of the nozzle touch block 9. The hydraulic cylinder 14 a is fixed to the receiving member 16 installed on the upper surface of the machine base, and the tip is attached to the rear part of the nozzle touch block 9. It is composed of a connected rod 14b, and by moving the rod 14b forward and backward, the cradle 8 moves forward and backward together with the upper melting holding cylinder 2 so that the nozzle touch and release of the injection cylinder 15 to the mold 6 can be performed. It is.
[0021]
The melting and holding cylinder 2 is provided with the melting and supplying device 3 at the material supply port provided at the middle upper side of the cylinder 21 and has a thixotropic property in the melting and holding cylinder 2 around the outer periphery of the cylinder 21 in a semi-molten state. Is provided with a heating means 24 such as a band heater for maintaining the temperature of the liquid at a temperature in the solid-liquid coexistence temperature region. Also, as shown in FIG. 2, the inside of the tip portion communicating with the nozzle opening of the nozzle member 22 is formed in a measuring chamber 25 having a required length that is reduced to a diameter smaller by 8 to 15% than the inner diameter of the cylindrical body, An injection head 26a of an injection plunger 26 is inserted into the measuring chamber 25 so as to be able to advance and retract.
[0022]
In addition, the inside of the melting and holding cylinder 2 from the upper edge of the material supply port to the upper portion is closed by the closing member 27 provided with the inner end face close to the upper edge of the supply port. The closing member 27 is composed of a shaft member having a length extending from the vicinity of the upper edge of the supply port to the rear end of the cylinder, and is airtightly fixed by bolting the outer end to the rear end of the cylinder. A rod 26b of the injection plunger 26 is connected to a piston rod 42 of the injection cylinder 4 through a through hole formed in the center, and the periphery is hermetically sealed by a plurality of rings 28 so as to be freely advanced and retracted.
[0023]
The thickness of the rod 26b of the injection plunger 26 varies depending on the inner diameter of the melt-holding cylinder 2, but the ratio between the inner diameter of the cylinder and the rod diameter is 2.5 or more. It is preferable to set as 35 mm or more. Incidentally, as a dimension from the above ratio, the rod diameter is in the range of 32 to 40 mm when the cylinder inner diameter is 115 mm.
[0024]
The injection head 26a of the injection plunger 26 includes a check valve 26c having a seal ring embedded in the outer peripheral surface thereof so as to be able to advance and retreat to the outer periphery, and a flow gap formed between the check valve 26c and the injection head 26a (see FIG. Is inserted into the measuring chamber 25 so as to be able to move forward and backward so that it can be opened and closed by contact and separation between the rear end face of the check valve 26c and the seat ring at the rear part of the injection plunger.
[0025]
In such a semi-melt molding machine, by the backward movement of the injection plunger 26, the injection head 26a of the measuring chamber 25 is slid to the backward limit position shown in FIG. The metering chamber 25 can be weighed to measure the metal slurry M2 in the metering chamber 25 from the nozzle member 22 through the nozzle touch block 9 and the injection cylinder 15 by the forward movement of the injection plunger 26 after the metering. The mold 6 that has been clamped can be injection-filled.
[0026]
The melt supply device 3 closes one end of an elongated cylindrical body (for example, a diameter of about 40 mm and a length of about 500 mm), and has a smaller diameter (for example, the inner diameter of the cylindrical body through which the metal slurry M1 flows in the center of the closed end. , About 7 mm), and the outflow path 31a is placed on the lower side, and the outflow path 31a is inserted into the material supply port provided in the cylindrical body 21 of the melting and holding cylinder 2, so that the melting and holding cylinder 2 And a hopper 35 connected to the top end of the melting cylinder 31.
[0027]
Heating means 32 such as a band heater or an induction heater for melting the granular material M supplied from the hopper 35 into a semi-molten metal slurry M1 having thixotropic properties is provided around the outer periphery of the melting cylinder 31. It is divided into a plurality of zones so that the temperature can be controlled.
[0028]
The hopper 35 is connected to the other end serving as the upper opening of the melting cylinder 31 via an intermediate member 33, and includes a feed screw 34 in the center of the inside thereof. The feed screw 34 is connected to a drive shaft of an electric motor 37 installed on the hopper cover plate 36 and is provided up to the inside of an intermediate member 33 that is an extension of the melting cylinder 31.
In addition, 38 is a material conveyance pipe | tube, 39 is an arm member which fixes the fusion | melting supply apparatus 3 to the support part 23 of the fusion | melting holding cylinder 2. FIG.
[0029]
In such a melting supply device 3, the granular material M can be stored in the hopper 35, and a predetermined amount thereof can be fed into the melting cylinder 31 by the rotation of the feed screw 34. The inside of the melting cylinder 31, the hopper 35 and the melting holding cylinder 2 is inactive by argon gas from the injection pipes 40a and 40b provided from the upper and lower parts of the melting cylinder 31 to the inside of the molten metal surface L of the melting holding cylinder 2. A gas atmosphere is maintained, thereby preventing the generation of oxides.
[0030]
The heating temperature of the melting cylinder 31 is a chip in which the granular material M employed therein is a magnesium alloy (AZ91D), and a solid material having a potential thixotropic property is cut to a length of less than 9.0 mm by a cutting machine. In the case of the shape, the temperature is set to a liquidus temperature or higher (600 ° C. to 620 ° C.) for the purpose of melting the granular material M into a semi-molten state in a short time. The heating means 24 maintains the temperature in the solid-liquid coexistence temperature region (570 ° to 595 ° C.).
[0031]
The granular material M is fed into the melting cylinder 21 from the hopper 35 by the rotation of the feed screw 34. In supplying the material to the melting cylinder 31, it is preferable that the rotational speed of the feed screw 34 is controlled in accordance with the melting capacity so that the material volume in the melting cylinder 31 is always adjusted to be constant. The granular material M in the melting cylinder 31 stays in the melting cylinder 31 without falling into the melting and holding cylinder 2 by the inner bottom surface 31b around the small-diameter outflow passage 31a, and is melted by heating from the surroundings.
[0032]
This material melting occurs when the temperature of the granular material M reaches the solid-liquid coexistence temperature region (550 ° C. or higher), and the finely granulated solid phase potentially possessed by the granular material M is uniformly dispersed. The metal slurry M1 is in a semi-molten state having a thixotropic property, and immediately flows down from the outflow path 31a into the molten holding cylinder 2 by its own weight and is stored.
[0033]
In the melting of the granular material M in the melting cylinder 31 having a small diameter, since the granular material M is heated in a dense state, the heat from the melting cylinder 31 is easily transmitted to each granular material M and the melting efficiency is improved. To do. Further, since melting proceeds at a temperature in the solid-liquid coexistence temperature region lower than the liquidus temperature, there is an energy saving effect. In addition, since the granular material M is rapidly melted by being heated from the surroundings in a dense state at the same time, it melts without being piled up on the upper surface of the metal slurry M1, so there is no steamed state and the generation of sludge caused by this is suppressed. Therefore, sludge deposition in the melting and holding cylinder 2 is also significantly reduced.
[0034]
The metal slurry M1 stored in the melt-holding cylinder 2 is heated to a temperature in the solid-liquid coexistence temperature region by the heating means 24 on the outer periphery, so that the solid phase is fine without melting completely. Maintains thixotropic properties that are granulated. However, even when the solid phase is in the solid-liquid coexistence temperature range, the solid phase continues to grow as time passes, the solid phase becomes coarse and dendritic, and the thixotropic properties are lost, making injection molding difficult. Therefore, it is preferable to limit the storage time of the semi-molten metal slurry, that is, the maximum storage amount.
[0035]
The maximum storage amount of the metal slurry M1 in the melt holding cylinder 2 is determined based on the injection filling amount per unit time obtained from the molding cycle time and the product weight, but the total amount does not exceed the storage time of 30 minutes. It is preferable to limit to a storage amount that can be injected and filled inside. Thereby, all of the injection filling of the metal slurry M1 can be performed within the time period in which the thixotropic property is maintained by the melt holding cylinder 2. For example, in the case of a molding cycle of 25 seconds and a shot weight of 50 g, since it takes 72 shots in 30 minutes, the storage amount is 3,600 g. In addition, in the case of one shot weight of 100 g, the storage amount is 7,200 g.
In addition, when the holding temperature is set at a temperature lower than normal of 550 ° C., for example, in the case of AZ91D, the storage time is allowed up to 60 minutes.
[0036]
The metal slurry M1 stored in the melting and holding cylinder 2 is measured by the injection head 26a that slides and moves the measuring chamber 25 to the retreat limit position by the retreating movement of the injection plunger 26. In this measurement, since the tip of the nozzle cylinder 15 is closed by the molding material remaining after cooling in the previous molding, the metering chamber 25 becomes negative pressure by the forcible retraction of the injection head 26a, thereby opening the check valve 26c. Then, the metal slurry M1 is sucked into the measurement chamber 25 from the flow gap with the injection head 26a, and is stored in the measurement chamber 25 until the injection head 26a stops at the retreat limit position, and the measurement is performed.
[0037]
The metal slurry M2 in the measuring chamber 25 is moved from the nozzle member 22 through the nozzle touch block 9 and the injection cylinder 15 to the product mold 6 that has been clamped as thixotropic metal slurry by the forward movement of the injection plunger 26 after measurement. It becomes a metal product with a solidified structure that is injected and filled and the solid phase is crystallized into fine particles.
[0038]
FIG. 3 shows an example of the melt supply device 3 in the case where the rod-shaped material M ′ formed into a round bar is used as the molding material. The round bar is made of the above-mentioned magnesium alloy and has a diameter of 40 to 60 mm and a length. It consists of 300 mm.
The melting supply device 3 includes a melting cylinder 31 provided with the heating means 32 on the outer periphery of the cylinder, a vertically long supply pipe 44 having a charging port 43 on a side portion connected to the upper portion thereof via an intermediate member 33, and a material pushing-in device. The plunger 45 is inserted downward, and is composed of an air or hydraulically operated pressing cylinder 46 attached to the top end of the supply pipe 44, and is erected on the melting holding cylinder 2 with the outflow path 31a side of the melting cylinder 31 as a lower part. Further, inert gas injection pipes 40 a and 40 b such as argon gas are provided from the lower part to the inside of the molten metal surface L of the melting and holding cylinder 2 and in the upper space of the melting cylinder 31.
[0039]
In such a melting and supplying apparatus 3, the plunger 45 is reduced and the rod-like material M ′ put into the supply pipe through the inlet 43 is pushed into the melting cylinder 31 by the extension of the plunger 45, and is heated by the outer peripheral heating means 32. The rod-shaped material M ′ is melted into a semi-molten metal slurry by heating the temperature to a temperature in the solid-liquid coexistence temperature range with a gradient in temperature.
[0040]
The semi-molten metal slurry M1 generated in the melting cylinder 31 becomes a thixotropic metal slurry M1 in which the finely granulated solid phase of the rod-shaped material M ′ is uniformly dispersed, and the small diameter is caused by its own weight. It flows down from the outflow path 31a (for example, 10 mm) into the melt holding cylinder 2 and is stored. In this rod-shaped material M ′, since the surface area per unit mass can be made smaller than that of the granular material M, it becomes difficult for oxides and the like adhering to the surface of the material to be brought into the melting cylinder 31 or the melting holding cylinder 2, and the sludge caused by oxidation Since the generation is further suppressed, the operating rate of the molding machine is improved as compared with the case of the granular material M.
[0041]
In the above embodiment, the rod-shaped material M ′ is pushed by the plunger 45. However, the rod-shaped material M ′ may be dropped and inserted by its own weight, and in this case, the supply cylinder except for the pressing cylinder 46 and the plunger 45 may be used. The material can be supplied simply by opening the upper portion of 44 and inserting the rod-like material M ′ from the upper opening.
[0042]
Further, in the semi-melt molding machine, the injection mechanism 2 is installed at an inclination with respect to the mold clamping mechanism 1. However, even if the injection mechanism 2 is installed horizontally, it functions in the same manner as in the installation at an inclination. Is not limited to the above embodiment.
[Brief description of the drawings]
FIG. 1 is a side view of a low melting point metal alloy semi-melt molding machine according to the present invention.
FIG. 2 is a vertical side view of the main part of the above.
FIG. 3 is a longitudinal side view of a main part of another embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Injection mechanism 2 Melting holding cylinder 3 Melting supply apparatus 4 Injection cylinder 5 Clamping apparatus 6 Mold 9 Nozzle touch block 15 Injection cylinder 22 Nozzle member 23 Support part 24 Heating means 25 Metering chamber 26 Injection plunger 31 Melting cylinder 32 Heating means 33 Intermediate member 34 Feed screw 35 Hopper 37 Electric motor 40a, 40b Inert gas injection pipe 43 Input port 44 Supply pipe 45 Plunger 46 Press cylinder

Claims (6)

Using a solid of low melting point metal alloy having thixotropic properties that solid phase is crystallized into fine particles as a molding material,
The solid material is melted into a semi-molten metal slurry having thixotropic properties in a solid-liquid coexistence state in a melt cylinder communicating with a melt holding cylinder having a nozzle at the tip and having an injection plunger inside,
The metal slurry is kept warm by flowing down to a melt-holding cylinder maintained at a solid-liquid coexistence temperature in the order of melting,
A method for semi-molten molding of a low-melting-point metal alloy, wherein the product mold is injection-filled by the forward movement of the injection plunger within a time period during which the thixotropic property is maintained by the melt-holding cylinder.   2. The method of semi-melt molding of a low-melting-point metal alloy according to claim 1, wherein the solid molding material is made of a solid material such as a chip-shaped granule, a rod, or an ingot.   2. The method of semi-melt molding of a low melting metal alloy according to claim 1, wherein the melting of the solid molding material and the heat retention of the metal slurry are performed in an inert gas atmosphere such as argon gas. A melt-holding cylinder having a nozzle member at the tip and an injection plunger inside and out so as to freely advance and retract;
An injection cylinder at the rear of the melt-holding cylinder that moves the injection plunger forward and backward;
A heating means around the outside of the cylinder for holding the metal slurry of the low melting point metal alloy having thixotropic properties in the melting and holding cylinder in a solid-liquid coexistence state;
A melting cylinder having an outflow path smaller in diameter than the inner diameter of the cylinder at the closed end of the cylinder, and standing up on the upper part of the melting holding cylinder on the lower side and communicating with each other inside;
A heating means around the outside of the cylinder for melting the granular material of the low melting point metal alloy having thixotropic properties in which the solid phase in the melting cylinder is crystallized into fine particles, into the metal slurry in a solid-liquid coexisting state;
A low melting point metal alloy semi-melt molding machine characterized by comprising a feed screw interior hopper continuously provided at the top end of a melting cylinder. A melt holding cylinder having a nozzle member at the tip, an injection plunger inside and outside to be freely moved back and forth, and provided with a heating means around the cylinder;
An injection cylinder at the rear of the melt-holding cylinder that moves the injection plunger forward and backward;
A heating means around the outside of the cylinder for holding the metal slurry of the low melting point metal alloy having thixotropic properties in the melting and holding cylinder in a solid-liquid coexistence state;
A melting cylinder having an outflow path smaller in diameter than the inner diameter of the cylinder at the closed end of the cylinder, and standing up on the upper part of the melting holding cylinder on the lower side and communicating with each other inside;
A heating means around the outside of the cylinder for melting the rod-shaped material of a low-melting-point metal alloy having a thixotropic property in which the solid phase in the melting cylinder is crystallized into fine particles, into the metal slurry in a solid-liquid coexisting state;
A low-melting-point metal alloy semi-melt molding machine characterized by comprising a supply cylinder continuously provided in an upper opening of a melting cylinder. The semi-melt molding machine has an injection pipe for an inert gas such as argon gas in a space from the lower part of the melting cylinder to the semi-molten liquid surface of the melting and holding cylinder. Item 6. A low melting point metal alloy semi-melt molding machine according to Item 4 or 5 .

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