JPH0788612A - Method for cooling amorphous alloy and device therefor - Google Patents

Abstract

PURPOSE:To secure a cooling rate sufficient for making a cast alloy material nonamorphous even if a nonamorphous alloy is not completely solidified in the part of a metal mold gate and sufficient packing is possible. CONSTITUTION:The metal molds 1 are kept heated before casting of a nonamorphous alloy material 5 and the cast alloy material 5 is made nonamorphous by rapidly cooling the metal molds 1 simultaneously when the nonamorphous alloy material 5 is cast into the metal molds 1 at the time of casting the nonamorphous alloy material 5 into the metal molds 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel casting / cooling method for an amorphous alloy material and an apparatus for carrying out the method.

[0002]

2. Description of the Related Art The temperature control of a conventional die casting machine or injection molding machine is carried out by using a mold temperature controller and adjusting the amount of cooling water, thereby stabilizing the temperature of the mold. , Has been regarded as important in making defect-free molded products.
For example, in die casting of amorphous alloys, about 10,000
Ultra-quick cooling of ℃ / sec or more was indispensable for forming cast metal into amorphous.

In other words, a high mold temperature results in a lower cooling rate (a mold of about 200 ° C. has a cooling rate of 100 to 1000 ° C./sec at most), and the cooling rate is insufficient. Amorphous alloy cannot be obtained. Therefore,
Liquid nitrogen, for example, was used as a coolant instead of cooling water for the purpose of lowering the mold temperature for super-quenching.

However, when the mold temperature is 0 ° C. to −30 ° C., the cast metal is inevitably solidified in the mold gate before the filling of the cast metal into the mold cavity is completed, resulting in insufficient filling. It was found that a perfect molded product could not be obtained.

Therefore, when the amorphous alloy is produced by die casting, when the amorphous alloy is being filled, the mold temperature is kept high to prevent the amorphous alloy from solidifying, and the filling is completed. At times, it is necessary to cool the mold so that the cooling rate is as fast as required for amorphization.

[0006]

In view of the above problems, the problem to be solved by the present invention is that the amorphous alloy is not solidified at the mold gate portion and sufficient filling is possible. Nevertheless, it is necessary to ensure a sufficient cooling rate for amorphization.

[0007]

According to the method for cooling an amorphous alloy according to claim 1, "When the amorphous alloy material (5) is cast in a mold (1), the amorphous alloy material is Before casting (5), the mold (1) is heated, and the amorphous alloy material (5) is cast into the mold (1) and at the same time the mold (1) is rapidly cooled to cast alloy material. (5) is made amorphous ”.

According to this, since the temperature of the mold (1) is high before casting, the solidification of the casting alloy (5) at the start of casting is delayed, and the casting alloy (5) to the mold (1) is delayed. Since the filling is sufficiently performed and the cast alloy (5) is rapidly cooled at the same time as the casting, it is possible to achieve amorphization. As a result, it is possible to obtain an amorphous alloy die cast product that is not insufficiently filled.

The method for cooling an amorphous alloy according to a second aspect is a method for limiting the first aspect, wherein "a casting alloy is cast from a die gate closing time (t3) due to solidification of a casting alloy material (5) after casting.
The time (t4) until the completion of the casting of (5) into the mold (1) is shortened ”. As a result, the time to complete casting
(t4) is sufficiently faster than the mold gate closing time (t3) due to solidification of the casting alloy material (5), so that the casting cavity (1d) of the casting alloy (5) should be completely filled. become.

According to a third aspect of the present invention, there is provided a method for cooling an amorphous alloy, wherein "when the amorphous alloy material (5) is cast into a mold (1), the amorphous alloy material (5) is cast before the casting. In the cooling method of the amorphous alloy (5), in which the amorphous alloy material (5) is cast into the mold (1) at the same time as (1) is heated and the mold (1) is rapidly cooled. The alloy material (5) reaches the mold gate (7), and at the same time the refrigerant (30) reaches the inlet (26a) of the refrigerant passage (26), the amorphous casting is started from the pouring device start start time (t1). From the starting time (t2) of the refrigerant supply device start time (T1) until the material (5) reaches the mold gate (7), the refrigerant (30) passes through the refrigerant passage (2).
The refrigerant arrival time (T2) reaching the entrance (26a) of 6) is calculated in advance, and only the time (Δt) obtained by subtracting the refrigerant arrival time (T2) from the casting material arrival time (T1) (Δt) is set to the casting device start start time ( t
1) The supply of the refrigerant (30) is started later than that of 1) '. As a result, the time (T1) until the casting material (5) reaches the mold gate (7), and the refrigerant supply device starts to operate the refrigerant (30).
Until the refrigerant reaches the inlet (26a) of the refrigerant passage (26) (T2)
Amorphous alloy material (5) mold by adjusting the time lag (Δt) of
It was possible to match the casting into (1) with the start of quenching of the mold (1), and it was possible to die cast the amorphous member without insufficient filling.

According to a fourth aspect of the present invention, there is provided a cooling device for an amorphous alloy which comprises a "mold (1) having a refrigerant passage (26) and a heat medium passage (28) and an inlet (26a) of the refrigerant passage (26). ), A refrigerant passage sensor (25), a refrigerant supply unit (11) for supplying the refrigerant (30) to the refrigerant passage (25), and a heat medium (31) for the heat medium passage (28). Before the amorphous alloy material (5) is cast into the heat medium supply unit (12) and the mold (1), the heat medium supply unit (12) is operated to pass the heat medium (31) through the heat medium. Road
The mold (1) is heated by passing it through (28), and the refrigerant (3) is cooled by the refrigerant passage sensor (25) from the refrigerant supply device start start time (t2).
Amorphous casting material (5) reaches the mold gate (7) from the arrival time (T2) of the refrigerant reaching the inlet (26a) of the refrigerant passage (26) and the start time of the casting device start (t1). The casting material arrival time up to (T1) has been calculated in advance, and at the time of casting, the casting device start start time (t1 ) Refrigerant supply unit (11) so that the supply of refrigerant (30) is started later than
And a control unit (24) for cooling the mold to operate the mold. ”Thus, the method of the present invention is carried out.

[0012]

The present invention will be described in detail below with reference to the illustrated embodiments, but the present invention is not limited thereto. FIG. 1 is a partial schematic cross-sectional view of an example of a vertical injection die casting molding apparatus according to the present invention, centering on an injection device (2).
In the figure, (1) shows a mold, (2) shows an injection device, (3) shows a tilting mechanism, and (6) shows a toggle mechanism.

The mold (1) includes a fixed mold (1a) and a movable mold (1b).
It consists of and. Fixed mold (1a) is fixed plate (14)
The moving die (1b) is fixed to the moving plate (15) via the moving die mounting plate (1c).
(19) is an extrusion pin for extruding a molded product. The moving plate (15) is slidably mounted on the tie bar (17), and the moving die (1b) is opened and closed by the action of the toggle mechanism (6). (6a) is a toggle link of the link mechanism. Reference numeral (16) is a support roller, which is mounted on the moving plate (15) and is configured to reciprocate on the rail under the load of the moving plate (15).

The injection device (2) comprises an injection sleeve (4) and a tip which is slidably reciprocally driven in the injection sleeve (4).
(27), a plunger rod (10a) with the tip (27) attached to the tip, and an injection cylinder (10) for operating the plunger rod (10a).

The tilting mechanism (3) is mainly composed of a frame (20) which pivotally supports the injection device (2) at its central portion and a tilting cylinder (8) which tilts the injection device (2). (20a)
Is the tilt axis.

The injection sleeve (4) is provided with a raw material heating means (9). This is, for example, a heater or an induction heating coil wound around the outer circumference of the injection sleeve (4), and the temperature of the injection sleeve (4) is adjusted so as to maintain a predetermined temperature and supplied to the injection sleeve (4). The amorphous alloy is kept in a molten state.

Next, an embodiment of the mold cooling device according to the present invention will be described with reference to FIGS. FIG. 2 is a block diagram showing the cooling circuit, and FIG. 3 is a block diagram of the temperature adjusting circuit. Both are drawn separately for explanation, but they are attached to one mold (1). There is.

As can be seen from FIGS. 1 and 4, the mold (1) is provided with a large number of refrigerant passages (26) and heat medium passages (28), and the refrigerant passages (26) are provided with a refrigerant. (30) is heat medium passage (28)
A heat medium (31) is allowed to flow through each.
A cavity (1d) is provided in the parting surface (P) of the mold (1) so that the injection sleeve (4) is connected through the mold gate (7).

At the outlet of the refrigerant passage (26) of the mold (1), the refrigerant is
A cold insulation tank (17) storing (30) is connected, and the refrigerant (30) in the cold insulation tank (17) is fed to the refrigerant passage (26) by the cooler (11a). Cooler (11
A cooling valve (20) is installed in the pipeline from a) to the inlet of the refrigerant passage (26), and an air valve (22) is installed in the pipeline.
An air source (29) is connected via. Further, a refrigerant passage sensor (25) is installed at the inlet of the refrigerant passage (26), and whether the refrigerant (30) supplied by the cooler (11a) reaches the inlet of the refrigerant passage (26). Is detecting.

The detection data of the refrigerant passage sensor (25) is the control unit.
Sent to (24). The control unit (24) opens and closes the cooling valve (20), the air valves (22) and (23), the temperature control valve (21), and the like based on the calculation result. Here, the cooling valve (2
0) is opened and then the refrigerant (30) is detected by the refrigerant passage sensor (25).
By detecting the time until it reaches the inlet of the refrigerant passage (26), after the refrigerant (30) opens the cooling valve (20) by the cooler (11a), the refrigerant passage (26) The time to reach the entrance can be measured.

The air source (29) is provided with a refrigerant passage (26) and a heat medium passage (2) via a cooling valve (22) and a temperature control valve (23).
8) and is connected to the cooling valve (22) or temperature control valve (2
By opening 3), compressed air is blown into the refrigerant passage (26) or the heat medium passage (28) and remains in the refrigerant passage (26) or the heat medium passage (28) ( The heat medium (31) and the heat medium (31) are blown off and returned to the cold insulation tank (17) and the heat insulation tank (18).

FIG. 3 is a temperature control circuit, which is a circuit for allowing the heat medium (31) to flow through the heat medium passage (28) formed in parallel with the refrigerant passage (26). A heat insulation tank (18) storing the heat medium (31) is installed at the outlet of the heat medium passage (28). Thermal insulation tank (1
The temperature controller (12a) is installed at the entrance of the heat medium passage (28) and the heat medium passage (28), and the heat medium (12a) is installed by the temperature control valve (21) at the outlet side of the temperature controller (12a). The supply of 31) to the heat medium passage (28) is intermittent. An air source (29) is connected to a pipeline for supplying the heat medium (31) via an air valve (23). The coolant (30) is, for example, water or liquid nitrogen. As the heat medium (31), for example, hot water or oil is used.

Next, the operation of the molding apparatus will be described with reference to the drawings. The toggle link (6a) of the toggle mechanism (6) is contracted to separate the moving mold (1b) from the fixed mold (1a), and the mold is opened.
Then, the tilting mechanism (3) is activated to move the injection device (2) to the tilt axis.
Rotate around (20a) and tilt the injection device (2).

Next, the parting surface of the mold (1a) (1b)
(P) and directly above the inclined injection sleeve (4), and the lubricant (26) is ejected from the lubricant injection nozzle (25) to allow the mold (1a) (1b) parting surface (P ), And apply the lubricant (26) to the surface of the injection sleeve (4).

Subsequently, the molten metal (5) of the amorphous alloy material is supplied to the injection sleeve (4) in an inert gas atmosphere, and the tilting mechanism is set.
Operate (3) in the opposite direction to raise the injection device (2) vertically.

During this time, the heater (9) is heating the injection sleeve (4), and the molten metal (5) in the injection sleeve (4) is heated.
Are kept in a molten state.

Subsequently, the toggle link (6) of the toggle mechanism (6)
a) is extended to close the moving mold (1b), and the injection sleeve is inserted into the runner hole provided on the parting surface (P) of both molds (1a) and (1b).
Connect the tip of (4).

Finally, the injection cylinder (10) is activated,
The tip (27) connected to the plunger rod (10a) is rapidly raised to push up the molten metal (5a) and cast the molten metal (5a) into the mold cavity.

The injection cylinder (10) operates and the cylinder rod (10a) pushes the molten metal (5) toward the mold gate (7) of the mold cavity (1d) and reaches the mold gate (7). The heat medium (31) passes through the temperature control valve (21) and the heat medium passage (28) by the operation of the temperature controller (12a) until the moment, and the mold (1) is maintained at a predetermined temperature.

The mold temperature is generally maintained at a temperature of 50 to 100 ° C. When the molten metal (5) reaches the mold gate (7), cooling of the cooler (11a) will be started, but the cooling passage (26) will be opened after the cooling valve (20) is opened. It will take a certain amount of time to reach the entrance of, and the start of cooling the mold (1) will be delayed. Therefore, by calculating the time until the refrigerant (30) reaches the inlet of the refrigerant passage (26) from the cooling valve (20), taking this into account, by opening the cooling valve (20) early, The time when the molten metal (5) reaches the die gate (7) and the time when the refrigerant (30) reaches the entrance of the refrigerant passage (26) are made to coincide with each other.

This makes it possible to match the start of casting of the amorphous alloy material (time when the molten metal (5) reaches the mold gate (7)) with the start of mold cooling. The method will be described below. From when the cooling valve (20) of the mold (1) was turned on, the mold
The time until the refrigerant passage sensor (25) provided immediately before the entrance of the cooling passage (26) of (1) is activated is measured in advance by the control unit (24).

Up to immediately before injection, the temperature control valve (2
1) is turned on and the mold (1) is about 50 ℃ -100 ℃
The temperature is regulated.

At the same time when the injection is started, the temperature control valve (21) of FIG. 2 is turned off, and at the same time, the air valve shown in FIG.
(23) is turned on, and all hot water or hot oil for temperature control in the mold (1) is stored in the heat retaining tank (18). If the heat medium (31) with a large specific heat such as water remains in the mold (1), when cooling, the heat medium (31) must be cooled at the same time, and the cooling rate becomes slower accordingly. Therefore, it is completely discharged by air before cooling.

Since the injection conditions such as the injection speed are input to the control unit (24) in advance, the injection time from the start of injection to the completion of filling (injection stop) is controlled by the control unit (2).
It can be easily calculated in 4), the refrigerant arrival time calculated in is subtracted from the injection time, and the refrigerant (30) will be exactly
Measure the time calculated above from the start of injection so that it comes immediately before the inlet (26a) of the refrigerant passage (26) of the mold (1), and at the same time when the time arrives, the cooling valve of the mold (1) ( Turn on 20). As a result, the passage of the amorphous alloy (5) through the die gate (7) coincides with the start of die cooling, and thereafter, ultra-quick cooling is performed to achieve amorphization.

After the amorphous alloy has cooled and solidified,
Although it is taken out from the mold (1), the cooling valve (20) of Fig. 2 is turned off almost at the same time as it is taken out, and the air valve (22)
Turns on with a little delay. This is the cooling pipe and mold (1)
All the refrigerant (30) in the refrigerant passage (26) is collected in the heat insulation tank (17). That is, if the refrigerant (30) such as water having a large specific heat remains in the refrigerant passage (26) of the mold (1), the heat of the mold (1) in the time cycle is taken away, and the temperature control is performed. Since the effect is hindered, it is completely discharged by the air as described above.

The temperature control valve (21) of FIG. 3 is turned on,
The heat medium (31) flows through the heat medium passage (28) again, and the die (1) is heated.

The injected molten metal (5a) is a cavity (1d)
When it solidifies inside, the toggle mechanism (6) is contracted again, the moving mold (1b) is separated from the fixed mold (1a), and the mold is opened.
The molded product is extruded by the extruding pin (19). Hereinafter, the above-mentioned work is repeated.

[0038]

Since the mold temperature is high, solidification in the mold gate is slightly delayed when the amorphous alloy is passing through the mold gate, so that a good flow of the molten metal is ensured and the mold of the molten metal is secured. The effect of eliminating defective filling of the cavity was obtained. Further, since the mold is cooled at the same time when the amorphous alloy is cast into the mold cavity, the mold temperature is rapidly lowered, and the amorphous alloy is also rapidly cooled, so that the amorphous alloy can be formed without insufficient filling. It became possible to obtain quality alloys.

[Brief description of drawings]

FIG. 1 is a partial schematic vertical sectional view centering on an injection device of an example of a vertical injection die casting molding device of the present invention.

FIG. 2 is a block diagram of a cooling circuit in FIG.

FIG. 3 is a block diagram of a temperature adjustment circuit in FIG.

FIG. 4 is a perspective view of one of the molds used in the present invention.

FIG. 5 is a front view of the mold used in the present invention when the mold is closed.

FIG. 6 is a graph showing a cooling and temperature control cycle in the present invention.

[Explanation of symbols]

 (1)… Mold (2)… Injection device (3)… Tilt mechanism (4)… Injection sleeve (5)… Molten metal (6)… Toggle mechanism (7)… Mold gate (9)… Material heating means ( 10) ... Injection cylinder (11) ... Refrigerant supply part (12) ... Heat medium supply part (13) ... Control part (27) ... Chip (30) ... Refrigerant (31) ... Heat medium

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Ken Masumoto, 3-8-22 Uesugi, Aoba-ku, Sendai-shi, Miyagi Prefecture (72) Akihisa Inoue Kawauchi, Kawauchi, Aoba-ku, Sendai-shi, Miyagi 11-806 (no house number) (72) Inventor Takao Nakamura 523 No. 1 Nishinoyama, Fukusato, Futami-cho, Akashi-shi, Hyogo Prefecture Toyo Kikai Kinzoku Co., Ltd.

Claims (4)

[Claims] 1. When casting an amorphous alloy material into a die, the die is heated before the amorphous alloy material is cast, and the amorphous alloy material is cast into the die at the same time. A method for cooling an amorphous alloy, which comprises quenching a die to amorphize a cast alloy material. 2. The method according to claim 1, wherein the time taken to complete the casting of the cast metal into the die is shorter than the time for closing the die gate due to the solidification of the cast alloy material after casting. Cooling method for crystalline alloy. 3. When casting an amorphous alloy material into a die, the die is heated before casting the amorphous alloy material, and the amorphous alloy material is cast into the die at the same time. In a method of cooling an amorphous alloy in which a die is rapidly cooled, the amorphous casting material is cooled from the start time of the casting device so that the casting alloy material reaches the die gate and the refrigerant reaches the inlet of the refrigerant passage at the same time. The arrival time of the casting material until reaching the mold gate and the arrival time of the refrigerant at the inlet of the refrigerant passage from the starting time of the refrigerant supply device are calculated, and the arrival time of the casting material is subtracted from the arrival time of the refrigerant. A method for cooling an amorphous alloy, characterized in that the supply of the refrigerant is started later than the starting time of the pouring device. 4. A mold having a refrigerant passage and a heat medium passage, a refrigerant passage sensor provided at an inlet of the refrigerant passage, a refrigerant supply unit for supplying the refrigerant to the refrigerant passage, and a heat medium passage. The heat medium supply unit that supplies the heat medium to the passage and the heat medium supply unit is activated before the amorphous alloy material is cast into the mold to allow the heat medium to pass through the heat medium passage and heat the mold. In advance, from the start time of the coolant supply device to the time when the coolant reaches the entrance of the coolant passage by the coolant passage sensor, and from the start time of the casting device until the amorphous casting material reaches the mold gate. Calculate the material arrival time in advance,
At the time of casting, it was configured with a control unit that operates the coolant supply unit to cool the mold so that the supply of the coolant is started later than the start time of the casting device by the time obtained by subtracting the coolant arrival time from the casting material arrival time. Cooling device for amorphous alloys.