JP4462594B2 - Aluminum casting equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an aluminum casting apparatus using a casting mold for supplying molten aluminum to a cavity of a casting mold and casting an aluminum casting in the cavity.
[0002]
[Prior art]
In casting aluminum, when supplying molten aluminum to the mold cavity, an oxide film is formed on the surface of the molten aluminum, and the generated oxide film increases the surface tension of the molten aluminum and decreases the fluidity of the molten aluminum. It can happen. For this reason, when an oxide film is generated on the surface of the molten aluminum, it is difficult to keep the molten aluminum flowing around properly.
[0003]
Therefore, for example, Japanese Patent Application No. 11-91445 (Japanese Patent Laid-Open No. 2000-280063) “Aluminum Casting Method” has been proposed as a casting method for suitably maintaining the hot-rollability of molten aluminum during aluminum casting. Hereinafter, this technique will be described with reference to the figures in the publication.
[0004]
FIG. 18 is a schematic view for explaining a conventional aluminum casting method. When casting aluminum, first, nitrogen gas (N ₂ Gas) is filled into the cavity 152 of the mold 151. Next, nitrogen gas is sent to the storage tank 153, and the magnesium powder (Mg powder) in the storage tank 153 is sent into the heating furnace 155 together with the nitrogen gas.
In this heating furnace 155, magnesium powder is sublimated, and the sublimated magnesium is reacted with nitrogen gas to form a gaseous magnesium nitrogen compound (Mg _Three N ₂ )
[0005]
This magnesium nitrogen compound is introduced into the cavity 152 of the mold 151 through the pipe 156, and the introduced magnesium nitrogen compound is deposited on the surface of the cavity 152.
Next, molten aluminum 157 is supplied into the cavity 152. The supplied molten aluminum 157 is reacted with a magnesium nitrogen compound to remove oxygen from the oxide on the surface of the molten aluminum 157.
[0006]
Thereby, it can prevent that an oxide film generate | occur | produces on the surface of the molten aluminum 157, and can suppress that the surface tension of the molten aluminum 157 increases. Accordingly, it is possible to keep the hot water flowing property of the molten aluminum 157 into the cavity 152, and to improve the quality of the cast aluminum product.
[0007]
Here, the production | generation process of the magnesium nitrogen compound mentioned above and the pouring process of molten aluminum are demonstrated in detail.
First, the production | generation process of a magnesium nitrogen compound is demonstrated. The magnesium powder is sublimated inside the heating furnace 155, and the sublimated magnesium is reacted with nitrogen gas inside the heating furnace 155. Since the sublimated magnesium is floating inside the heating furnace 155, nitrogen gas adheres to the entire surface of the magnesium, and a magnesium nitrogen compound is generated over the entire surface.
[0008]
Next, the pouring process of the molten aluminum will be described.
FIG. 19 is an explanatory view of the main part of a conventional aluminum casting method. After depositing a magnesium nitrogen compound layer 159 (hereinafter referred to as “magnesium nitrogen compound layer 159”) on the surface of the cavity 152, molten aluminum in the cavity 152. The state where 157 is supplied is shown.
By supplying molten aluminum 157 to cavity 152, surface 157 a of molten aluminum 157 comes into contact with surface 159 a of magnesium nitrogen compound layer 159, and oxygen is removed from oxide 157 b generated on surface 157 a of molten aluminum 157.
[0009]
[Problems to be solved by the invention]
As described with reference to FIG. 19, by bringing the surface 157 a of the molten aluminum 157 into contact with the surface 159 a of the magnesium nitrogen compound layer 159, oxygen can be removed from the oxide 157 b generated on the surface 157 a of the molten aluminum 157.
Therefore, in order to remove oxygen from the oxide 157b generated on the surface 157a of the molten aluminum 157, it is sufficient that only the surface 159a of the magnesium nitrogen compound layer 159 with which the surface 157a of the molten aluminum 157 contacts is present. I understand.
[0010]
However, as described with reference to FIG. 18, since the magnesium nitrogen compound is generated in a state where magnesium is suspended inside the heating furnace 155, nitrogen gas adheres to the entire surface of the magnesium. For this reason, a magnesium nitrogen compound is produced in the entire surface of magnesium. Since this magnesium nitrogen compound is deposited on the surface of the cavity 152, a magnesium nitrogen compound layer 159 having a film thickness t is formed as shown in FIG.
[0011]
For this reason, an excessive magnesium nitrogen compound layer 159 is deposited on the surface of the cavity 152, and it takes time to generate the magnesium nitrogen compound layer 159, which hinders productivity.
In addition, since an excessive magnesium nitrogen compound layer 159 is generated, the amount of nitrogen gas used increases, which hinders cost reduction.
[0012]
Further, in the casting method of the above publication, in the previous step of the step of generating the magnesium nitrogen compound layer 159 on the surface of the cavity 152, the cavity 152 is filled with nitrogen gas while leaving air in the cavity 152. The method is adopted.
For this reason, it is difficult for air to escape smoothly from the inside of the cavity 152, and it takes time to bring the inside of the cavity 152 into a nitrogen gas atmosphere, which hinders productivity.
[0013]
Therefore, an object of the present invention is to provide an aluminum casting apparatus using a casting mold that can produce a magnesium nitrogen compound in a short time and reduce the amount of nitrogen gas used.
[0014]
[Means for Solving the Problems]
In order to achieve the above object, claim 1 of the present invention is an aluminum casting apparatus for casting an aluminum casting in a cavity by supplying molten aluminum to the cavity of the casting mold, wherein the aluminum casting apparatus includes air in the cavity. An air discharge portion for discharging the inert gas, an inert gas introduction portion for introducing an inert gas into the cavity from which the air has been discharged, and a magnesium introduction portion for introducing gaseous magnesium into the cavity after introducing the inert gas, By controlling the nitrogen gas introduction part for introducing heated nitrogen gas into the cavity after introducing gaseous magnesium, the air discharge part, the inert gas introduction part, the magnesium introduction part and the nitrogen gas introduction part, respectively. And a control unit that adjusts the inside of the cavity to a predetermined pressure.
[0015]
The aluminum casting apparatus was provided with an air discharge part, an inert gas introduction part, a magnesium introduction part, and a nitrogen gas introduction part, and these parts were controlled by the control part so as to adjust the inside of the cavity to a predetermined pressure. Thus, by adjusting the inside of the cavity to a predetermined pressure by the control unit, magnesium can be efficiently precipitated on the surface of the cavity, and magnesium nitrogen can be efficiently generated on the surface of the precipitated magnesium layer.
Therefore, the production of the magnesium nitrogen compound can be performed in a short time.
[0016]
In addition, by generating nitrogen magnesium only on the surface of the magnesium layer, it is possible to prevent nitrogen magnesium from being generated up to the inside of the magnesium layer. For this reason, the usage-amount of nitrogen gas can be decreased.
[0017]
According to a second aspect of the present invention, a part where the air discharge part faces the cavity and a part where the inert gas introduction part faces the cavity are provided to face each other.
[0018]
By providing the part where the air discharge part faces the cavity and the part where the inert gas introduction part faces the cavity, the air inside the cavity is brought to the air discharge part side by the inert gas supplied into the cavity. Can be sent efficiently.
For this reason, since the air in a cavity can be efficiently discharged | emitted from a discharge flow path, the inside of a cavity can be changed into the atmosphere of an inert gas in a short time.
[0019]
According to a third aspect of the present invention, the control unit can individually control the air discharge unit, the inert gas introduction unit, the magnesium introduction unit, and the nitrogen gas introduction unit.
[0020]
By controlling the air discharge part, inert gas introduction part, magnesium introduction part and nitrogen gas introduction part individually by the control part, the environment in the cavity is matched to the deposition conditions of the magnesium layer and the production conditions of magnesium nitride. Can be adjusted easily.
By simply setting the deposition conditions of the magnesium layer and the generation conditions of the magnesium nitride, the deposition of the magnesium layer and the generation of the magnesium nitride can be performed in a short time.
[0021]
According to a fourth aspect of the present invention, a sublimation part that sublimates magnesium to produce gaseous magnesium is provided in the magnesium introduction part, and a heating part that heats nitrogen gas is provided in the nitrogen gas introduction part. Each temperature can be adjusted by controlling with a control part, It is characterized by the above-mentioned.
[0022]
By controlling the sublimation part and the heating part respectively by the control part, magnesium can be sublimated efficiently and suitably in the sublimation part, and nitrogen gas can be efficiently and suitably heated in the heating part. Thereby, a magnesium layer can be deposited efficiently and magnesium nitride can be generated efficiently.
In addition, the deposition of the magnesium layer and the production of magnesium nitride can be performed in a short time.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a perspective view of a disk rotor cast by an aluminum casting apparatus (first embodiment) according to the present invention.
The disk rotor 10 is an aluminum member including a cylindrical hub portion 11 and a disk-shaped disk portion 18 formed integrally with the hub portion 11.
[0024]
The hub portion 11 is formed by integrally forming a lid 13 at the outer end of the peripheral wall 12. An opening 14 is opened at the center of the lid 13, and bolt holes 15... The same shall apply hereinafter) and stud holes 16...
Bolts (not shown) are inserted from the bolt holes 15... And the disk rotor 10 is attached to the drive shaft (not shown) side with these bolts.
The stud holes 16 are holes through which studs (not shown) are press-fitted in order to attach the wheels to the disk rotor 10.
[0025]
FIG. 2 is an overall schematic view of an aluminum casting apparatus (first embodiment) according to the present invention.
The aluminum casting apparatus 20 includes a casting apparatus body 21 having a casting mold 22, an air discharge unit 40 that discharges air in the cavity 25 provided in the casting mold 22, and argon ( An inert gas introduction part 45 for introducing Ar) gas (inert gas (rare gas)), and a magnesium introduction part 50 for introducing gaseous magnesium (Mg) into the cavity 25 after introducing the inert gas; , Heated nitrogen into the cavity 25 after introducing gaseous magnesium (N ₂ ) A nitrogen gas introduction unit 60 for introducing gas, a detection unit 65 for detecting the pressure in the cavity 25, and a control unit 70 for adjusting the inside of the cavity 25 to a predetermined pressure based on detection information of the detection unit 65. .
[0026]
The casting apparatus main body 21 has a fixed plate 31 attached to a base 30, a fixed die 23 of a casting mold 22 is attached to the fixed plate 31, guide rods 32 and 32 are attached to the fixed plate 31, and the guide rods 32 and 32 are movable. The movable plate 24 is supported by the movable plate 33, the movable mold 24 of the casting mold 22 is attached to the movable plate 33, and a hot water passage 34 that opens to the cavity 25 is formed in the fixed die 23 and the base 30. There is provided a plunger 35, a pouring gate 36 is formed vertically from the pouring passage 34, the upper end of the pouring gate 36 is closed with a tenon 37, and a pouring bath 38 that can communicate with the pouring gate 36 is provided above the pouring gate 36.
The fixed mold 23 and the movable mold 24 constitute a casting mold 22.
[0027]
According to this aluminum casting apparatus 20, the movable mold 24 is moved to the mold clamping position (position shown in the figure) and the mold opening position by moving the movable plate 33 in the direction of the arrow by a moving means (not shown). Can do. The cavity 25 can be formed by the fixed mold 23 and the movable mold 24 by making the movable mold 24 stationary at the mold clamping position. After supplying the molten aluminum 39 to the cavity 25, an aluminum casting can be cast in the cavity 25 by pressurizing the molten aluminum 39 with the plunger 35.
[0028]
The air discharge unit 40 is configured to communicate with a cavity 25 through a discharge channel 41 and to switch the vacuum pump 42 between a drive state and a stop state based on a control signal from the control unit 70. It is.
By switching the vacuum pump 42 to the driving state, the air in the cavity 25 can be discharged to the atmosphere via the discharge flow path 41.
[0029]
The inert gas introduction unit 45 communicates an argon gas cylinder 47 with the cavity 25 via the introduction channel 46, and includes an argon on-off valve 48 in the middle of the introduction channel 46. Is configured to switch between an open state and a closed state based on a control signal from
The argon in the argon gas cylinder 47 can be introduced into the cavity 25 via the introduction flow path 46 by switching the argon on-off valve 48 to the open state.
[0030]
A part 25a where the introduction flow path 46 of the inert gas introduction part 45 faces the cavity 25 and a part 25b where the discharge flow path 41 of the air discharge part 40 faces the cavity 25 are respectively opposed surfaces of the surface of the cavity 25. 26a and 26b. Thereby, the part 25a where the introduction flow path 46 faces the cavity 25 and the part 25b where the discharge flow path 41 faces the cavity 25 can be made to face each other.
Therefore, when argon gas is introduced into the cavity 25 from the argon gas introduction flow path 46, the air in the cavity 25 is brought closer to the discharge flow path 41 side with the argon gas. For this reason, the air in the cavity 25 can be efficiently discharged from the discharge channel 41.
[0031]
The magnesium introduction unit 50 includes a first magnesium introduction channel 51 and a second magnesium introduction channel 52 in the middle of the introduction channel 46, and the sublimation unit 53 communicates with the first and second magnesium introduction channels 51 and 52. A magnesium opening / closing valve 57 is provided in the middle of the first magnesium introduction flow path 51.
[0032]
The sublimation unit 53 includes an accommodation case 54 that communicates with the outlet end 51 a of the first magnesium introduction flow channel 51 and communicates with the inlet end 52 a of the second magnesium introduction flow channel 52, and a sublimation heater is provided outside the accommodation case 54. 55.
The sublimation unit 53 is configured to adjust the heating temperature by switching the sublimation heater 55 between a heating state and a non-heating state based on a control signal from the control unit 70.
By heating the sublimation heater 55, the inside of the housing case 54 is heated to a predetermined temperature (for example, 400 ° C. or more), thereby sublimating the magnesium ingot (magnesium) 58 in the housing case 54 to form a gas. can do.
[0033]
The magnesium on-off valve 57 is a valve that can be switched between an open state and a closed state based on a control signal from the control unit 70. By switching the magnesium on-off valve 57 to the open state, the argon gas in the argon gas cylinder 47 is introduced into the housing case 54 via the first magnesium introduction flow path 51, and gaseous argon is introduced into the storage case 54 with the introduced argon gas. It can be introduced into the cavity 25 through the 2 magnesium introduction channel 52 and the introduction channel 46.
[0034]
The nitrogen gas introduction unit 60 communicates a nitrogen gas cylinder 62 with the cavity 25 via a nitrogen introduction channel 61, and includes a nitrogen opening / closing valve 63 and a heating unit (heater) 64 in the middle of the nitrogen introduction channel 61.
The nitrogen on-off valve 63 is a valve that can be switched between an open state and a closed state based on a control signal from the control unit 70. By switching the nitrogen opening / closing valve 63 to the open state, the nitrogen gas in the nitrogen gas cylinder 62 can be introduced into the cavity 25 through the nitrogen introduction channel 61.
[0035]
The nitrogen gas introduction unit 60 is configured to adjust the heating temperature by switching the heating unit 64 between a heating state and a non-heating state based on a control signal from the control unit 70. By heating the heating unit 64, the nitrogen gas flowing through the nitrogen introduction channel 61 can be heated to a predetermined temperature (for example, 400 ° C. or higher).
[0036]
The detection unit 65 includes a sensor 66 at the upper end of the cavity 25, detects the pressure in the cavity 25 with the sensor 66, and transmits the detected information to the control unit 70.
[0037]
The control unit 70 is configured so that the air discharge unit 40, the inert gas introduction unit 45, the magnesium introduction unit 50, and the nitrogen gas introduction unit 60 can be individually controlled based on the pressure detection information from the detection unit 65, and the air By controlling the discharge part 40, the inert gas introduction part 45, the magnesium introduction part 50, and the nitrogen gas introduction part 60, the pressure inside the cavity 25 is adjusted to a predetermined pressure.
[0038]
According to the control unit 70, a signal for switching the vacuum pump 42 to the driving / stopping state can be transmitted to the vacuum pump 42, and a signal for switching the argon opening / closing valve 48 to the opening / closing state is transmitted to the argon opening / closing valve 48. A signal for switching the magnesium on-off valve 57 to the open / closed state can be transmitted to the magnesium on-off valve 57, and a signal for switching the nitrogen on-off valve 63 to the open / closed state is transmitted to the nitrogen on-off valve 63. be able to.
Further, according to the control unit 70, a signal for switching the sublimation heater 55 of the sublimation unit 53 between the heating state and the non-heating state can be transmitted to the sublimation heater 55, and the heating unit 64 can be transmitted between the heating state and the non-heating state. A signal for switching to and can be transmitted to the heating unit.
[0039]
Hereinafter, the operation of the aluminum casting apparatus 20 (first embodiment) according to the present invention will be described.
FIG. 3 is a flowchart for explaining the operation of the first embodiment according to the present invention, and shows an aluminum casting method. In the figure, STxx indicates a step number.
ST10: Air is discharged from the cavity of the closed casting mold, and the cavity is filled with an inert gas, so that the cavity has a first pressure.
ST11: Gaseous magnesium is introduced into the cavity to precipitate magnesium on the cavity surface, and the inside of the cavity is set to the second pressure.
[0040]
ST12: Heated nitrogen gas is introduced into the cavity and magnesium nitride (Mg) is introduced into the cavity surface. _Three N ₂ ) And a third pressure P in the cavity.
ST13: An aluminum casting is supplied into the cavity, and an aluminum casting is cast in the cavity while reducing the surface of the molten aluminum with magnesium nitride.
Hereinafter, the operation of the aluminum casting according to the present invention, that is, the steps of the aluminum casting method (ST10 to ST13) will be described in detail with reference to FIGS.
[0041]
FIG. 4 is a first operation explanatory diagram of the first embodiment according to the present invention, and shows ST10.
By transmitting a drive signal from the control unit 70 to the vacuum pump 42 to drive the vacuum pump 42, the air in the cavity 25 is discharged to the atmosphere via the discharge channel 41.
At the same time, the controller 70 transmits an open signal to the argon on-off valve 48 to switch the argon on-off valve 48 to the open state. By switching the argon open / close valve 48 to the open state, the argon gas (indicated by “dots”) in the argon gas cylinder 47 is introduced into the cavity 25 through the introduction flow path 46.
[0042]
After the air in the cavity 25 is discharged, a stop signal is transmitted from the control unit 70 to the vacuum pump 42 to stop the vacuum pump 42. When the pressure in the cavity 25 detected by the sensor 66 of the detection unit 65 becomes 0.5 atm which is lower than the atmospheric pressure, the control unit 70 sends a close signal to the argon on-off valve 48. The argon on-off valve 48 is closed.
[0043]
Thereby, the inside of the cavity 25 can be made into the atmosphere state of argon gas. When the inside of the cavity 25 was changed to an argon gal atmosphere, air was discharged from the inside of the cavity 25. For this reason, the air in the cavity 25 can be changed to an argon gas atmosphere in a short time.
In addition, the air in the atmosphere can be prevented from entering the cavity 25 by adjusting the inside of the cavity 25 to the first pressure. For this reason, the inside of the cavity 25 can be more efficiently changed to an atmosphere of argon gas.
[0044]
FIG. 5 is an explanatory view of the second action of the first embodiment according to the present invention. A portion 25a where the introduction flow path 46 of the inert gas introduction section 45 faces the cavity 25 and a discharge flow path 41 of the air discharge section 40 are shown. A state in which the portion 25b facing the cavity 25 is provided opposite to each other is shown.
[0045]
In this way, the argon gas introduction flow path 46 is provided at a position facing the air discharge flow path 41, so that argon gas (indicated by “dots”) enters the cavity 25 from the argon gas introduction flow path 46. Is introduced as shown by arrow (1), the argon gas region 47a is increased, so that the air region 41a in the cavity 25 can be efficiently brought closer to the discharge channel 41 side.
For this reason, the air in the cavity 25 can be efficiently discharged from the discharge channel 41 as indicated by the arrow (2). Therefore, the air in the cavity 25 can be discharged in a shorter time to change to an argon gas atmosphere.
[0046]
FIG. 6 is an explanatory diagram of a third action of the first embodiment according to the present invention, and shows ST11.
The sublimation heater 55 of the sublimation unit 53 is heated by a signal from the control unit 70, and the inside of the housing case 54 is heated to a predetermined temperature (for example, 400 ° C. or higher). By heating the inside of the housing case 54, the magnesium ingot 58 is sublimated into a gaseous state. The gaseous magnesium in the housing case 54 is indicated by “dots”.
[0047]
An opening signal is transmitted from the control unit 70 to the magnesium on-off valve 57 to switch the magnesium on-off valve 57 to the open state. By switching the magnesium on-off valve 57 to the open state, the argon gas in the argon gas cylinder 47 is introduced into the housing case 54 via the first magnesium introduction flow path 51.
Gaseous magnesium (indicated by “dots”) is introduced into the cavity 25 through the second magnesium introduction channel 52 and the introduction channel 46 by the introduced argon gas. At this time, the second pressure (0.5 to 0.7 atm) in the cavity 25 is adjusted to be equal to or lower than the atmospheric pressure.
[0048]
Here, as described with reference to FIG. 4, the first pressure (0.5 atm) is set to be equal to or lower than the atmospheric pressure similarly to the second pressure (0.5 to 0.7 atm). Since the pressure difference between the first pressure and the second pressure can be made small or no pressure difference, the transition from the first pressure to the second pressure can be made in a short time. For this reason, the time lag at the time of changing from the first pressure to the second pressure can be suppressed.
Returning to FIG. 6, when the gaseous magnesium is introduced into the cavity 25, the second magnesium introduction channel 52 and the introduction channel 46 are heated by heating the second magnesium introduction channel 52 and the introduction channel 46. It is preferable to prevent magnesium from precipitating.
[0049]
FIG. 7 is an explanatory diagram of a fourth action of the first embodiment according to the present invention.
The gaseous magnesium introduced into the cavity 25 as shown by the arrow touches the surface of the cavity 25 and the temperature drops to 150 to 250 ° C. When the temperature of gaseous magnesium falls to 150 to 250 ° C., gaseous magnesium is deposited on the surface of the cavity 25. This precipitated magnesium is taken as a magnesium layer 58a.
[0050]
Here, by adjusting the second pressure (0.5 to 0.7 atm) in the cavity 25 to be equal to or lower than the atmospheric pressure, the condition in which magnesium is likely to precipitate in the cavity 25 (that is, the surface temperature of the cavity 25 is set to be lower). 150 to 250 ° C.), magnesium can be precipitated efficiently.
[0051]
Returning to FIG. 6, when the pressure in the cavity 25 detected by the sensor 66 of the detection unit 65 becomes the second pressure set in advance, the control unit 70 transmits a close signal to the magnesium on-off valve 57 to transmit magnesium. The on-off valve 57 is closed.
[0052]
FIG. 8 is an explanatory diagram of a fifth operation of the first embodiment according to the present invention, and shows ST12.
The heating unit 64 of the nitrogen gas introduction unit 60 is brought into a heating state by a signal from the control unit 70. In this state, an open signal is transmitted from the control unit 70 to the nitrogen open / close valve 63 to switch the nitrogen open / close valve 63 to the open state. By switching the open / close valve 63 for nitrogen to the open state, the nitrogen gas in the nitrogen gas cylinder 62 is caused to flow into the nitrogen introduction channel 61, the nitrogen gas in the nitrogen introduction channel 61 is heated by the heating unit 64, and the heated nitrogen The gas is introduced into the cavity 25 through the nitrogen introduction channel 61.
At the same time, a driving signal is transmitted from the control unit 70 to the vacuum pump 42 to drive the vacuum pump 42, whereby the gas in the cavity 25 is discharged to the atmosphere via the discharge channel 41. Thereby, the pressure in the cavity 25 is adjusted so that the third pressure P is, for example, 0.1 atm and atmospheric pressure or less.
[0053]
Thus, by individually heating the nitrogen gas individually in the heating furnace 64, the nitrogen gas flowing through the nitrogen introduction channel 61 can be efficiently heated to a predetermined temperature (for example, 400 ° C. or higher).
[0054]
FIG. 9 is an explanatory diagram of a sixth action of the first embodiment according to the present invention.
Here, when the third pressure P (atmospheric pressure) in the cavity 25 is T (° C.) and the temperature of the nitrogen gas (shown by “dots”) in the cavity 25 at this time is P ≦ (T− 270) / 130, the third pressure P and the gas temperature T of the nitrogen gas are set. By satisfying this condition, the magnesium layer 58a deposited on the surface of the cavity 25 reacts with the nitrogen gas, and magnesium nitride (Mg) is formed on the surface of the magnesium layer 58a. _Three N ₂ 58b can be generated.
[0055]
Specifically, for example, when the third pressure P in the cavity 25 detected by the sensor 66 of the detection unit 65 is 0.1 atm, the nitrogen in the cavity 25 is derived from the relationship P ≦ (T−270) / 130. By adjusting the gas temperature T to be 283 ° C., magnesium nitride 58b can be generated on the surface of the magnesium layer 58a.
Further, when the third pressure P in the cavity 25 is 1 atm, the temperature T of the nitrogen gas in the cavity 25 is adjusted to 400 ° C. from the relationship of P ≦ (T−270) / 130. The magnesium nitride 58b can be generated on the surface of the magnesium layer 58a.
In this way, the third pressure P and the gas temperature T of the nitrogen gas in the cavity 25 can be determined relatively easily based on the relationship P ≦ (T−270) / 130. It can be done in a short time.
[0056]
Furthermore, when producing the magnesium nitride 58b, the nitrogen gas was heated and the heated nitrogen gas was used. For this reason, since the nitrogen gas can be heated to a temperature at which the magnesium nitride 58b is easily generated, the magnesium nitride 58b can be generated efficiently.
[0057]
Here, by adjusting the inside of the cavity 25 to the third pressure P, the condition that the magnesium nitride 58b is likely to precipitate in the cavity 25 (that is, the third pressure P is 0.1 atm, the gas temperature in the cavity 25). Can be set to 283 ° C.), so that the magnesium nitride 58b can be generated efficiently.
In addition, by setting the third pressure P in the cavity 25 to be equal to or lower than the atmospheric pressure, the gas temperature of the nitrogen gas in the cavity 25 can be adjusted to a temperature at which the magnesium nitride 58b can be easily generated.
[0058]
7 and 9, when forming the magnesium nitride 58b, first, magnesium is deposited on the surface of the cavity 25 to form a magnesium layer 58a, and then nitrogen gas is introduced into the cavity 25 to form magnesium. Magnesium nitride 58b is formed on the surface of the layer 58a.
Thereby, since the magnesium nitride 58b can be produced | generated only on the surface of the magnesium layer 58a, the production | generation time of the magnesium nitride 58b can be shortened.
In addition, since only the magnesium nitride 58b needs to be generated on the surface of the magnesium layer 58a, the amount of nitrogen gas used can be reduced.
[0059]
FIGS. 10A and 10B are explanatory views of a seventh operation of the first embodiment according to the present invention and show the first half of ST13.
In (a), the tenon 37 of the casting apparatus main body 21 is operated to open the pouring gate 36, whereby the molten aluminum 39 in the pouring bath 38 is supplied to the cavity 25 through the pouring gate 36 and the pouring passage 34 as shown by the arrows.
[0060]
In (b), the surface 39a of the molten aluminum 39 supplied into the cavity 25 is in contact with the magnesium nitride 58b. Here, there is a possibility that the oxide 39b is generated on the surface 39a of the molten aluminum 39, but even if the oxide 39b is generated, the oxide 39b reacts with the magnesium nitride 58b to generate the oxide 39b. Can remove oxygen from the water.
[0061]
Thereby, it can prevent that an oxide film generate | occur | produces on the surface 39a of the molten aluminum 39, and can suppress that the surface tension of the molten aluminum 39 increases. Accordingly, it is possible to keep the hot water supply property to the cavity 25 of the molten aluminum 39 suitably.
[0062]
FIGS. 11A and 11B are explanatory views of the eighth action of the first embodiment according to the present invention and show the latter half of ST13.
In (a), after supplying a predetermined amount of molten aluminum 39 from the pouring bath 38 to the cavity 25 side, the gate 36 is closed with a tenon 37. In this state, the plunger 35 is extruded toward the cavity 25 to fill the cavity 25 with the molten aluminum 39.
Here, in FIG. 9, the third pressure P in the cavity 25 is adjusted to be equal to or lower than the atmospheric pressure (for example, 0.1 atmosphere), so that the molten aluminum 39 can be smoothly filled in the cavity 25. .
[0063]
In (b), the casting mold 22 is opened to take out an aluminum casting 39c obtained by solidification of the molten aluminum 39 (shown in (a)). Since the cast aluminum product 39c can keep the hot-rolling performance suitably during pouring, the quality can be further improved.
The aluminum casting 39c is processed to obtain the disk rotor 10 shown in FIG.
[0064]
As described above, according to the first embodiment, the aluminum casting apparatus 20 includes the air discharge part 40, the inert gas introduction part 45, the magnesium introduction part 50, and the nitrogen gas introduction part 60. 45, 50, and 60 are controlled by the control unit 70 to adjust the inside of the cavity 25 to a predetermined pressure.
[0065]
Thus, by adjusting the inside of the cavity 25 to a predetermined pressure by the control unit 70, the magnesium layer 58a can be efficiently deposited on the surface of the cavity 25, and the nitrogen magnesium 58b can be efficiently deposited on the surface of the deposited magnesium layer 58a. Can be generated.
Therefore, the production of nitrogen magnesium 58b can be performed in a short time.
In addition, since only the magnesium nitride 58b needs to be generated on the surface of the magnesium layer 58a, the amount of nitrogen gas used can be reduced.
[0066]
Further, according to the first embodiment, the air discharge unit 40, the inert gas introduction unit 45, the magnesium introduction unit 50, and the nitrogen gas introduction unit 60 can be individually controlled by the control unit 70. For this reason, the environment in the cavity 25 can be easily adjusted according to the deposition conditions of the magnesium layer 58a and the generation conditions of the magnesium nitride 58b.
By simply setting the deposition conditions of the magnesium layer 58a and the generation conditions of the magnesium nitride 58b, the deposition of the magnesium layer 58a and the generation of the magnesium nitride 58b can be performed in a short time.
[0067]
In addition, according to the first embodiment, the sublimation unit 53 and the heating unit 64 are controlled by the control unit 70, respectively, whereby the sublimation unit 53 can efficiently and suitably sublimate magnesium into a gaseous state, and heating Nitrogen gas can be efficiently and suitably heated by the portion 64. Thereby, the magnesium layer 58a can be efficiently deposited, and the magnesium nitride 58b can be efficiently generated.
In addition, deposition of the magnesium layer 58a and generation of the magnesium nitride 58b can be performed in a short time.
[0068]
Next, a modification in which the disk rotor 10 (see FIG. 1) is cast by the aluminum casting apparatus 20 shown in FIG. 2 will be described.
This modification is characterized in that the first and second pressures in the cavity 25 are set to atmospheric pressure, and the third pressure P in the cavity 25 is set to a negative pressure lower than atmospheric pressure. In addition, in the aluminum casting method of FIGS. 3-11, the 1st, 2nd pressure and 3rd pressure P are each set to below atmospheric pressure.
[0069]
By setting the first pressure to the atmospheric pressure, the pressure in the cavity 25 can be made the same as in the atmosphere. Therefore, when the inside of the cavity 25 is changed to an argon gas atmosphere, the air in the atmosphere becomes the cavity 25. It is possible to more reliably prevent intrusion into the inside.
[0070]
The second pressure in the cavity 25 was set to atmospheric pressure. As described in the first embodiment, the condition for depositing magnesium on the surface of the cavity 25 is to lower the surface temperature of the cavity 25 to about 150 to 250 ° C. If it is about 150 to 250 ° C. Even if the second pressure in the cavity 25 is not reduced below atmospheric pressure, the temperature can be adjusted relatively easily.
In addition, when the 2nd pressure in the cavity 25 is set to atmospheric pressure, the precipitation temperature of magnesium is 300 degreeC. For this reason, for example, if the surface temperature of the cavity 25 is set to about 150 to 250 ° C., magnesium can be sufficiently precipitated.
[0071]
Furthermore, the pressure in the cavity 25 can be made the same as that in the atmosphere by setting the second pressure to atmospheric pressure. For this reason, when depositing magnesium on the surface of the cavity 25, it is possible to continuously and efficiently prevent air in the atmosphere from entering the cavity 25.
[0072]
Thus, by setting the first pressure and the second pressure to atmospheric pressure, it is possible to more reliably prevent air from entering the cavity 25, so that the nitrogen magnesium 58 b is added to the surface of the cavity 25. It can be generated more efficiently.
Further, when the molten aluminum 39 is supplied into the cavity 25, it is possible to suppress the generation of the oxide 39b on the surface 39a of the molten aluminum 39.
[0073]
Further, by setting the third pressure P to a negative pressure lower than atmospheric pressure, the molten aluminum 39 can be more smoothly filled into the cavity 25 during pouring. Here, when the pressure in the cavity 25 is adjusted from the second pressure (atmospheric pressure) to the third pressure P (less than atmospheric pressure), the controller 70 controls the vacuum pump 42 as in the first embodiment. The drive signal is transmitted to the vacuum pump 42 to drive the gas in the cavity 25 to the atmosphere via the discharge channel 41.
[0074]
Thus, according to the modification of the first embodiment, by setting the first pressure and the second pressure to atmospheric pressure and setting the third pressure P to a negative pressure less than atmospheric pressure, The aluminum casting process can be performed more efficiently, and the productivity can be further increased.
[0075]
Next, 2nd Embodiment is described based on FIGS. In the second embodiment, the same members as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.
FIG. 12 is an overall schematic view of an aluminum casting apparatus (second embodiment) according to the present invention.
The aluminum casting apparatus 80 includes a casting apparatus main body 81 provided with a casting mold 82, an air discharge unit 40 that discharges air in the cavity 87 provided in the casting mold 82, and argon ( An inert gas introduction part 45 for introducing Ar) gas (inert gas (rare gas)), and a magnesium introduction part 50 for introducing gaseous magnesium (Mg) into the cavity 87 after introducing the inert gas; , Heated nitrogen (N) in the cavity 87 after introducing gaseous magnesium ₂ ) A nitrogen gas introduction unit 60 for introducing gas, a detection unit 65 for detecting the pressure in the cavity 87, and a control unit 70 for adjusting the inside of the cavity 87 to a predetermined pressure based on detection information of the detection unit 65. .
[0076]
The casting apparatus main body 81 has a fixed plate 91 attached to a base 90, a fixed die 83 attached to the fixed plate 91, a movable plate 92 attached to the base 90 in a movable manner, a movable die 84 attached to the movable plate 92, and a movable plate. A moving means 93 for moving 92 is provided on the base 90, a core 85 of the casting mold 82 is attached to the base 90 so as to be movable up and down by an elevating means 94, and a runner 95 opening to the cavity 87 is formed in the movable mold 84, A pouring gate 96 is formed vertically with respect to the hot water passage 95, a pouring bath 97 for storing the molten aluminum 39 is provided above the pouring gate 96, and an opening 98 for degassing and hot water is provided at the upper end of the casting mold 82.
The fixed mold 83, the movable mold 84, and the core 85 constitute a casting mold 82.
[0077]
In FIG. 12, in order to facilitate understanding of the casting apparatus main body 81, the pouring gate 96 and the opening 98 are illustrated and described with respect to the cavity 87. However, the actual pouring gate 96 and the opening 98 are separated from the cavity 87. When the casting mold 82 is clamped, the cavity 87 can be kept almost sealed.
[0078]
According to this aluminum casting apparatus 80, the movable mold 92 can be moved between the mold clamping position (position shown in the figure) and the mold opening position by moving the movable plate 92 in the direction of the arrow by the moving means 93. Further, the core 85 can be moved to the mold clamping position (position shown in the figure) and the mold opening position by moving the core 85 in the direction of the arrow by the elevating means 94.
[0079]
By making the movable mold 84 and the core 85 stationary at the mold clamping position, the cavity 87 can be formed by the fixed mold 83, the movable mold 84 and the core 85. An aluminum casting 39 can be supplied into the cavity 87 to cast an aluminum casting in the cavity 87.
The casting apparatus main body 81 is configured to flow the molten aluminum 39 into the cavity 87 using its own weight under atmospheric pressure, and is different from the casting apparatus main body 21 of the first embodiment in this respect.
[0080]
Next, an operation of the aluminum casting apparatus 80 (second embodiment) according to the present invention, that is, an aluminum casting method will be described with reference to FIGS. 3 and 12 to 17.
First, step ST10 in FIG. 3 will be described.
By transmitting a drive signal from the control unit 70 shown in FIG. 12 to the vacuum pump 42 to drive the vacuum pump 42, the air in the cavity 87 is discharged to the atmosphere via the discharge flow channel 41.
[0081]
At the same time, the controller 70 transmits an open signal to the argon on-off valve 48 to switch the argon on-off valve 48 to the open state. The argon gas in the argon gas cylinder 47 is introduced into the cavity 87 through the introduction flow path 46 by switching the argon on-off valve 48 to the open state.
[0082]
After the air in the cavity 87 is discharged, a stop signal is transmitted from the control unit 70 to the vacuum pump 42 to stop the vacuum pump 42. When the pressure in the cavity 87 detected by the sensor 66 of the detection unit 65 becomes 0.5 atm which is lower than the atmospheric pressure, the control unit 70 sends a close signal to the argon on-off valve 48. The argon on-off valve 48 is closed.
[0083]
Thereby, the inside of the cavity 87 can be changed to the atmosphere of argon gas. When the inside of the cavity 87 is changed to an atmosphere of argon gal, air is discharged from the inside of the cavity 87. For this reason, the air in the cavity 87 can be changed to an atmosphere of argon gas in a short time.
In addition, the inside of the cavity 87 was adjusted to the first pressure. For this reason, since air in the atmosphere can be prevented from entering the cavity 87, the inside of the cavity can be changed to an argon gas atmosphere more efficiently.
[0084]
FIG. 13 is an explanatory view of the first action of the second embodiment according to the present invention. A portion 87 a where the introduction flow path 46 of the inert gas introduction portion 45 (see also FIG. 12) faces the cavity 87 is designated as the air discharge portion 40. The state where the discharge channel 41 (see also FIG. 12) is provided at a position away from the portion 87 b facing the cavity 87 is shown.
[0085]
As described above, since the argon gas introduction flow path 46 is provided at a position separated from the air discharge flow path 41, argon gas (indicated by “dots”) is indicated by an arrow from the argon gas introduction flow path 46 into the cavity 87. When introduced as in (3), the area of argon gas 100 is increased, so that the area of air 101 in the cavity 87 can be efficiently brought closer to the discharge channel 41 side.
For this reason, the air in the cavity 87 can be efficiently discharged from the discharge channel 41 as indicated by the arrow (4). Therefore, the air in the cavity 87 can be discharged in a shorter time to change to an argon gas atmosphere.
[0086]
Next, step ST11 of FIG. 3 will be described.
Returning to FIG. 12, the sublimation heater 55 of the sublimation unit 53 is heated by a signal from the control unit 70, and the inside of the housing case 54 is heated to a predetermined temperature (for example, 400 ° C. or higher). By heating the inside of the housing case 54, the magnesium ingot 58 is sublimated into a gaseous state.
[0087]
An opening signal is transmitted from the control unit 70 to the magnesium on-off valve 57 to switch the magnesium on-off valve 57 to the open state. By switching the magnesium on-off valve 57 to the open state, the argon gas in the argon gas cylinder 47 is introduced into the housing case 54 via the first magnesium introduction flow path 51.
Gaseous magnesium is introduced into the cavity 87 through the second magnesium introduction channel 52 and the introduction channel 46 by the introduced argon gas. At this time, the second pressure (0.5 to 0.7 atm) in the cavity 87 is adjusted to be equal to or lower than the atmospheric pressure.
[0088]
Here, the first pressure (0.5 atm) when the inside of the cavity 87 is changed to the atmosphere of argon gas is set to be equal to or lower than the atmospheric pressure similarly to the second pressure (0.5 to 0.7 atm). Thus, the transition from the first pressure to the second pressure can be made in a short time. For this reason, the time lag at the time of changing from the first pressure to the second pressure can be suppressed.
When the gaseous magnesium is introduced into the cavity 87, the magnesium is not deposited in the second magnesium introduction channel 52 and the introduction channel 46 by heating the second magnesium introduction channel 52 and the introduction channel 46. It is preferable to do so.
[0089]
FIG. 14 is an explanatory diagram of a second action of the second embodiment according to the present invention.
The gaseous magnesium introduced into the cavity 87 as shown by the arrow touches the surface of the cavity 87 and the temperature drops to 150 to 250 ° C. When the temperature of gaseous magnesium falls to 150 to 250 ° C., gaseous magnesium is deposited on the surface of the cavity 87. Hereinafter, the precipitated magnesium will be described as the magnesium layer 102.
[0090]
Here, by adjusting the second pressure in the cavity 87 to be equal to or lower than the atmospheric pressure, the condition in which the magnesium easily precipitates in the cavity 87 (that is, the surface temperature of the cavity 87 is 150 to 250 ° C.) is easily set. Therefore, magnesium can be precipitated efficiently.
[0091]
Returning to FIG. 12, when the pressure in the cavity 87 detected by the sensor 66 of the detection unit 65 reaches the preset second pressure (0.5 to 0.7 atmospheric pressure), the control unit 70 supplies the magnesium. A closing signal is transmitted to the opening / closing valve 57 to close the magnesium opening / closing valve 57.
[0092]
Next, step ST12 of FIG. 3 will be described.
The heating unit 64 of the nitrogen gas introduction unit 60 is heated by a signal from the control unit 70 shown in FIG. In this state, an open signal is transmitted from the control unit 70 to the nitrogen open / close valve 63 to switch the nitrogen open / close valve 63 to the open state. By switching the open / close valve 63 for nitrogen to the open state, the nitrogen gas in the nitrogen gas cylinder 62 is caused to flow into the nitrogen introduction channel 61, the nitrogen gas in the nitrogen introduction channel 61 is heated by the heating unit 64, and the heated nitrogen A gas is introduced into the cavity 87 through the nitrogen introduction channel 61.
At the same time, a driving signal is transmitted from the control unit 70 to the vacuum pump 42 to drive the vacuum pump 42, whereby the gas in the cavity 87 is discharged to the atmosphere via the discharge channel 41. Thereby, the 3rd pressure P in the cavity 87 is adjusted so that it may become 0.7-0.8 atmospheres and an atmospheric pressure or less as an example.
[0093]
Thus, by individually heating the nitrogen gas individually in the heating furnace 64, the nitrogen gas flowing through the nitrogen introduction channel 61 can be efficiently heated to a predetermined temperature (for example, 400 ° C. or higher).
[0094]
FIG. 15 is an explanatory diagram of a third action of the second embodiment according to the present invention.
Here, when the third pressure in the cavity 87 is P (atmospheric pressure) and the temperature of the nitrogen gas in the cavity 87 (indicated by “dots”) at this time is T (° C.), P ≦ (T− 270) / 130, the third pressure P and the temperature T of the nitrogen gas are set. By satisfying this condition, the magnesium layer 102 deposited on the surface of the cavity 87 reacts with the nitrogen gas, and the magnesium nitride 103 can be generated on the surface of the magnesium layer 102.
[0095]
Specifically, for example, when the third pressure P in the cavity 87 detected by the sensor 66 of the detection unit 65 is 0.7 atmospheric pressure, the nitrogen in the cavity 87 is determined from the relationship P ≦ (T−270) / 130. By adjusting the gas temperature T to be 361 ° C., the magnesium nitride 103 can be generated on the surface of the magnesium layer 102.
Further, when the third pressure P in the cavity 87 is 1 atm, the temperature T of the nitrogen gas in the cavity 87 is adjusted to 400 ° C. from the relationship of P ≦ (T−270) / 130. The magnesium nitride 103 can be generated on the surface of the magnesium layer 102.
Thus, the third pressure P and the gas temperature T of the nitrogen gas in the cavity 87 can be determined relatively easily based on the relationship of P ≦ (T−270) / 130. It can be done in a short time.
[0096]
Furthermore, when producing the magnesium nitride 103, the nitrogen gas was heated and the heated nitrogen gas was used. For this reason, since the nitrogen gas can be heated to a temperature at which the magnesium nitride 103 is easily generated, the magnesium nitride 103 can be generated efficiently.
[0097]
Here, by adjusting the inside of the cavity 87 to the third pressure P, conditions under which the magnesium nitride 103 is likely to precipitate in the cavity 87 (for example, the third pressure P is 0.7 atm and the gas in the cavity 87 is The temperature can be set to 361 ° C.), so that the magnesium nitride 103 can be generated efficiently.
In addition, by setting the third pressure P in the cavity 87 to be equal to or lower than the atmospheric pressure, the gas temperature of the nitrogen gas in the cavity 87 can be adjusted to a temperature at which the magnesium nitride 103 can be easily generated.
[0098]
As shown in FIGS. 14 and 15, when forming the magnesium nitride 103, first, magnesium is deposited on the surface of the cavity 87 to form the magnesium layer 102, and then nitrogen gas is introduced into the cavity 87 to introduce the magnesium layer. Magnesium nitride 103 is generated on the surface of 102. Thereby, since the magnesium nitride 103 can be produced | generated only on the surface of the magnesium layer 102, the production | generation time of the magnesium nitride 103 can be shortened.
In addition, since it is only necessary to generate the magnesium nitride 103 only on the surface of the magnesium layer 102, the amount of nitrogen gas used can be reduced.
[0099]
Next, step ST13 in FIG. 3 will be described.
16 (a) and 16 (b) are explanatory views of the fourth action of the second embodiment according to the present invention.
In (a), by pouring the pouring tank 97 of the casting apparatus main body 81, the molten aluminum 39 in the pouring tank 97 is supplied to the cavity 87 through the gate 96 and the hot water channel 95 as shown by arrows.
Here, since the third pressure P in the cavity 87 is adjusted to be equal to or lower than the atmospheric pressure, the aluminum melt 39 can be smoothly filled in the cavity 87.
[0100]
In (b), the surface 39 a of the molten aluminum 39 supplied into the cavity 87 is in contact with the magnesium nitride 103. Here, there is a possibility that the oxide 39b is generated on the surface 39a of the molten aluminum 39. However, even if the oxide 39b is generated, the oxide 39b reacts with the magnesium nitride 103 to generate the oxide 39b. Can remove oxygen from the water.
[0101]
Thereby, it can prevent that an oxide film generate | occur | produces on the surface 39a of the molten aluminum 39, and can suppress that the surface tension of the molten aluminum 39 increases. Accordingly, it is possible to keep the hot water supply property to the cavity 87 of the molten aluminum 39 suitably.
[0102]
17 (a) and 17 (b) are explanatory views of a fifth operation of the second embodiment according to the present invention.
In (a), after supplying a predetermined amount of molten aluminum 39 from the pouring bath 97 to the cavity 87, the pouring bath 97 is returned to the horizontal. After the molten aluminum 39 is solidified, the casting mold 82 is opened by lowering the core 85 with the lifting / lowering means 94 as shown by the arrow (5) and moving the movable mold 84 with the moving means 93 as shown by the arrow (6). To do.
[0103]
In (b), the casting mold 82 is opened to take out an aluminum casting 105 obtained by solidification of the molten aluminum 39 (shown in (a)). Since the cast aluminum product 105 can keep the hot-rolling performance suitable during pouring, the quality can be further improved.
After removing the non-product part 105a and the non-product part 105b from the cast aluminum product 105, the product part is processed to obtain an engine cylinder block.
[0104]
As described above, according to the second embodiment, the aluminum casting apparatus 80 includes the air discharge part 40, the inert gas introduction part 45, the magnesium introduction part 50, and the nitrogen gas introduction part 60. 45, 50 and 60 are controlled by the control unit 70 to adjust the inside of the cavity 87 to a predetermined pressure.
[0105]
Thus, by adjusting the inside of the cavity 87 to a predetermined pressure by the control unit 70, the magnesium layer 102 can be efficiently deposited on the surface of the cavity 87, and the nitrogen magnesium 103 can be efficiently deposited on the surface of the deposited magnesium layer 102. Can be generated.
Therefore, the production of nitrogen magnesium 103 can be performed in a short time.
In addition, since it is only necessary to generate the magnesium nitride 103 only on the surface of the magnesium layer 102, the amount of nitrogen gas used can be reduced.
[0106]
Furthermore, according to the second embodiment, the air discharge part 40, the inert gas introduction part 45, the magnesium introduction part 50, and the nitrogen gas introduction part 60 can be individually controlled by the control part 70. For this reason, the environment in the cavity 87 can be easily adjusted according to the deposition conditions of the magnesium layer 102 and the generation conditions of the magnesium nitride 103.
By simply setting the deposition conditions of the magnesium layer 102 and the generation conditions of the magnesium nitride 103, the deposition of the magnesium layer 102 and the generation of the magnesium nitride 103 can be performed in a short time.
[0107]
In addition, according to the second embodiment, the sublimation unit 53 and the heating unit 64 are controlled by the control unit 70, respectively, so that the sublimation unit 53 can sublimate magnesium efficiently and preferably in a gaseous state, and heating. Nitrogen gas can be efficiently and suitably heated by the portion 64. Thereby, the magnesium layer 102 can be deposited efficiently, and the magnesium nitride 103 can be generated efficiently.
In addition, deposition of the magnesium layer 102 and generation of the magnesium nitride 103 can be performed in a short time.
[0108]
Next, a modification in which a cylinder block is cast by the aluminum casting apparatus 80 shown in FIG. 12 will be described.
This modification is characterized in that the first and second pressures in the cavity 87 are each set to atmospheric pressure, and the third pressure P is set to a negative pressure less than atmospheric pressure. In addition, in the aluminum casting method of FIGS. 13-17, the 1st, 2nd pressure and 3rd pressure P are each set to below atmospheric pressure.
[0109]
By setting the first pressure to atmospheric pressure, the pressure in the cavity 87 can be made the same as that in the atmosphere. Therefore, when the inside of the cavity 87 is changed to an argon gas atmosphere, the air in the atmosphere becomes the cavity 87. It is possible to more reliably prevent intrusion into the inside.
[0110]
The second pressure in the cavity 87 was set to atmospheric pressure. The condition for precipitating magnesium on the surface of the cavity 87 is to lower the surface temperature of the cavity 87 to about 150 to 250 ° C. as described in the second embodiment. The temperature can be adjusted relatively easily without reducing the second pressure in the cavity 87 to atmospheric pressure or lower.
In addition, when the 2nd pressure in the cavity 25 is set to atmospheric pressure, the precipitation temperature of magnesium is 300 degreeC. For this reason, for example, if the surface temperature of the cavity 87 is set to about 150 to 250 ° C., magnesium can be sufficiently precipitated.
[0111]
Furthermore, the pressure in the cavity 87 can be made the same as that in the atmosphere by setting the second pressure to atmospheric pressure. For this reason, when depositing magnesium on the surface of the cavity 87, it is possible to more reliably prevent air in the atmosphere from entering the cavity 87.
[0112]
In this way, by setting the first pressure and the second pressure to atmospheric pressure, it is possible to more reliably prevent air from entering the cavity 87, so that the nitrogen magnesium 103 is put on the surface of the cavity 87. It can be generated more efficiently.
Furthermore, when the molten aluminum 39 is supplied into the cavity 87, it is possible to suppress the generation of the oxide 39b on the surface 39a of the molten aluminum 39.
[0113]
Moreover, the molten aluminum 39 can be more smoothly filled in the cavity 87 by setting the third pressure P to a negative pressure lower than the atmospheric pressure. Here, when the pressure in the cavity 87 is adjusted from the second pressure (atmospheric pressure) to the third pressure P (less than atmospheric pressure), the controller 70 controls the vacuum pump 42 as in the second embodiment. The drive signal is transmitted to the vacuum pump 42 to drive the gas in the cavity 87 to the atmosphere via the discharge channel 41.
[0114]
Thus, according to the modification of the second embodiment, by setting the first pressure and the second pressure to atmospheric pressure and setting the third pressure P to a negative pressure less than atmospheric pressure, The aluminum casting process can be performed more efficiently, and the productivity can be further increased.
[0115]
In the above-described embodiment, the example is described in which the atmosphere is changed to the argon gas atmosphere in the cavity of the casting mold. However, it is also possible to use an inert gas such as helium instead of the argon gas.
Furthermore, instead of an inert gas such as argon gas, it is possible to use a nitrogen gas that is chemically inert compared to air.
[0116]
In addition, the aluminum casting apparatus according to the embodiment can be applied to an aluminum alloy containing silicon, nickel, copper, or pure aluminum as an example.
Furthermore, each value of the 1st, 2nd, 3rd pressure demonstrated by the said embodiment shows an example, and the 1st, 2nd, 3rd pressure is not restricted to this.
[0117]
Furthermore, in the said embodiment, although the pressure in the cavities 25 and 87 was detected with the sensor 66 of the detection part 65, the example which adjusts the inside of the cavities 25 and 87 to desired pressure based on this detection pressure information was demonstrated. Without being limited thereto, the inside of the cavities 25 and 87 can be adjusted to a desired pressure without using the detection unit 65.
As an example, when the detection unit 65 is not used, the inside of the cavities 25 and 87 can be adjusted to a desired pressure by controlling the control unit 70 based on a previously taught condition.
[0118]
【The invention's effect】
The present invention exhibits the following effects by the above configuration.
According to the first aspect of the present invention, the aluminum casting apparatus includes an air discharge unit, an inert gas introduction unit, a magnesium introduction unit, and a nitrogen gas introduction unit, and these parts are controlled by the control unit so as to adjust the inside of the cavity to a predetermined pressure. Configured. Thus, by adjusting the inside of the cavity to a predetermined pressure by the control unit, magnesium can be efficiently precipitated on the surface of the cavity, and magnesium nitrogen can be efficiently generated on the surface of the precipitated magnesium layer.
Therefore, the production of the magnesium nitrogen compound can be carried out in a short time, so that productivity can be improved.
[0119]
In addition, by generating nitrogen magnesium only on the surface of the magnesium layer, it is possible to prevent nitrogen magnesium from being generated up to the inside of the magnesium layer. For this reason, since the usage-amount of nitrogen gas can be decreased, cost can be held down.
[0120]
According to the second aspect of the present invention, the portion where the air discharge portion faces the cavity and the portion where the inert gas introduction portion faces the cavity are provided to face each other, so that the air in the cavity is supplied with the inert gas supplied into the cavity. Efficiently approaching the air discharge part side.
For this reason, since the air in a cavity can be efficiently discharged | emitted from a discharge flow path, the inside of a cavity can be changed into the atmosphere of an inert gas in a short time, and productivity can be improved.
[0121]
According to the third aspect of the present invention, the air discharge unit, the inert gas introduction unit, the magnesium introduction unit, and the nitrogen gas introduction unit are individually controlled by the control unit, so that the environment in the cavity can be controlled according to the deposition conditions of the magnesium layer and the magnesium nitride. It can be easily adjusted according to the generation conditions.
By simply setting the deposition conditions of the magnesium layer and the generation conditions of the magnesium nitride, the deposition of the magnesium layer and the generation of the magnesium nitride can be performed in a short time. Therefore, the productivity of the aluminum casting product can be increased.
[0122]
According to the fourth aspect of the present invention, the sublimation unit and the heating unit are controlled by the control unit, respectively, so that magnesium can be sublimated efficiently and suitably, and nitrogen gas can be efficiently and suitably heated by the heating unit. it can. Thereby, a magnesium layer can be deposited efficiently and magnesium nitride can be generated efficiently.
In addition, since the deposition of the magnesium layer and the production of magnesium nitride can be performed in a short time, the productivity of the aluminum casting can be increased.
[Brief description of the drawings]
FIG. 1 is a perspective view of a disk rotor cast by an aluminum casting apparatus according to the present invention (first embodiment).
FIG. 2 is an overall schematic view of an aluminum casting apparatus (first embodiment) according to the present invention.
FIG. 3 is a flowchart for explaining the operation of the first embodiment according to the present invention.
FIG. 4 is a diagram illustrating a first operation of the first embodiment according to the present invention.
FIG. 5 is a diagram illustrating a second operation of the first embodiment according to the present invention.
FIG. 6 is an explanatory diagram of a third action of the first embodiment according to the present invention.
FIG. 7 is a diagram illustrating a fourth operation of the first embodiment according to the present invention.
FIG. 8 is an explanatory diagram of a fifth operation of the first embodiment according to the present invention.
FIG. 9 is an explanatory diagram of a sixth action of the first embodiment according to the present invention.
FIG. 10 is an explanatory diagram of a seventh action of the first embodiment according to the present invention.
FIG. 11 is an explanatory diagram of an eighth action of the first embodiment according to the present invention.
FIG. 12 is an overall schematic view of an aluminum casting apparatus (second embodiment) according to the present invention.
FIG. 13 is a diagram illustrating a first operation of the second embodiment according to the present invention.
FIG. 14 is a diagram illustrating a second operation of the second embodiment according to the present invention.
FIG. 15 is an explanatory diagram of a third action of the second embodiment according to the invention.
FIG. 16 is a diagram illustrating a fourth operation of the second embodiment according to the invention.
FIG. 17 is a diagram illustrating a fifth operation of the second embodiment according to the invention.
FIG. 18 is a schematic diagram for explaining a conventional aluminum casting apparatus.
FIG. 19 is an explanatory view of main parts of a conventional aluminum casting apparatus.
[Explanation of symbols]
20, 80 ... Aluminum casting apparatus, 22, 82 ... Casting mold, 25, 87 ... Cavity, 25a ... Site where inert gas introduction part faces cavity, 25b ... Site where air discharge part faces cavity, 39 ... Molten aluminum 39a ... surface of molten aluminum, 39c, 105 ... cast aluminum, 40 ... air discharge part, 45 ... inert gas introduction part, 50 ... magnesium introduction part, 53 ... sublimation part, 60 ... nitrogen gas introduction part, 64 ... Heating unit, 70... Control unit.

Claims (4)

In an aluminum casting apparatus for supplying molten aluminum to a cavity of a casting mold and casting an aluminum casting in the cavity,
The aluminum casting apparatus includes an air discharge unit that discharges air in the cavity,
An inert gas introduction part for introducing an inert gas into the cavity from which the air has been discharged;
A magnesium introduction part for introducing gaseous magnesium into the cavity after introducing the inert gas;
A nitrogen gas introduction part for introducing heated nitrogen gas into the cavity after introducing gaseous magnesium;
An aluminum casting apparatus comprising: a control unit that adjusts the inside of the cavity to a predetermined pressure by controlling the air discharge unit, the inert gas introduction unit, the magnesium introduction unit, and the nitrogen gas introduction unit. The aluminum casting apparatus according to claim 1, wherein a part where the air discharge part faces the cavity and a part where the inert gas introduction part faces the cavity are provided to face each other. 2. The aluminum casting apparatus according to claim 1, wherein the control unit is capable of individually controlling the air discharge unit, the inert gas introduction unit, the magnesium introduction unit, and the nitrogen gas introduction unit. In the magnesium introduction part, a sublimation part for sublimating magnesium to produce gaseous magnesium is provided, and a heating part for heating nitrogen gas is provided in the nitrogen gas introduction part,
2. The aluminum casting apparatus according to claim 1, wherein the temperature can be adjusted by controlling the sublimation unit and the heating unit by the control unit.

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