JP2002096149A - Venting device for die-casting metal die - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a venting device for a die-casting metal die which can exhaust gas in the metal die sufficiently and additionally ensure to prevent problems of molten metal intrusion. SOLUTION: Prior to closure of a shut-off valve 8 at a sucking hole of a vacuum pump device 6, immediately before or immediately after a cavity 21 of the die-casting metal die 1 is filled with molten metal 2 (when a sensor 14 at the upper end of the cavity detects molten metal 2), the shut-off valve 8 is driven to squeeze an opening at the suction hole of the vacuum pump device 6 in advance. In this way, time from the detection of the molten metal 2 by a vacuum vent sensor 3 to the closure of the suction hold of the vacuum pump 6 by the shut-off valve 8 is shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a degassing apparatus for a die casting mold for sucking a gas in the die casting mold during injection.

[0002]

2. Description of the Related Art Conventionally, in the ordinary die casting method, gas in a die casting mold has been discharged as a countermeasure in order to prevent generation of blowholes in a product.

For example, as shown in FIG. 7, in an apparatus 100 for performing a normal die casting method, the molten metal 102 is filled into a cavity 112 of a die casting mold 101 in an initial state in which a shutoff valve 108 is at an open end position. Then, when the injection operation is started, gas suction by the vacuum device 106 is started based on a gas release start signal transmitted during the injection operation. Thereby, the vacuum runner 10
7 and the die casting die 101 through the gas vent 109.
The gas inside can be exhausted.

However, if the gas suction by the vacuum device 106 is continued as it is, there is a problem that the molten metal 102 flowing in the die casting mold 101 enters the cylinder 110 and the vacuum device 106. It is necessary to terminate the gas suction by the vacuum device 106.

Therefore, when the molten metal 102 is detected by the molten metal detection sensor 103 provided in the vacuum runner 107,
By switching the hydraulic valve 105, the control device 104 retreats the piston 113 connected to the shutoff valve 108, and moves the shutoff valve 108 from the open end position to the closed end position. In addition to preventing the occurrence of a problem that the molten metal 102 enters the vacuum chamber 110 and the vacuum device 106, the gas suction by the vacuum device 106 is terminated.

The determination as to whether the shutoff valve 108 is located at the open end or the closed end is made by detecting the position of the piston 113 connected to the shutoff valve 108 with two limit switches 111. ing.

At this time, the molten metal detection sensor 10
Since a certain amount of time (time lag) is required from the time when the molten metal 102 is detected in Step 3 to the time when the shutoff valve 108 is moved to the closed end position, the molten metal 102 enters the cylinder 110 and the vacuum device 106. For example, as shown in FIG. 8, the vacuum runner 107 is provided in a meandering manner to prevent the
07 is increased to delay the speed at which the melt 102 is filled into the vacuum runner 107.

Further, a weir is provided in the vacuum runner 107 to further delay the speed at which the molten metal 102 is filled in the vacuum runner 107, or to reduce the stroke of the shutoff valve 108 (from the open end position to the closed end position). Is shortened to shorten the time lag described above.

[0009]

However, a weir is provided in the vacuum runner 107 or a shutoff valve 108 is provided.
Stroke (distance from open end to closed end)
Or shortening the length of the vacuum device 106 results in a narrowing of the suction port of the vacuum device 106, so that the gas in the die casting mold 101 may not be sufficiently discharged.

The present invention has been made in order to solve the above-mentioned problems, and it is possible to sufficiently discharge gas from a die-casting mold, and in addition to this, a molten metal enters. An object of the present invention is to provide a degassing device for a die-casting die that also ensures that occurrence of a defect is prevented.

[0011]

According to a first aspect of the present invention, there is provided an apparatus for opening a suction port communicating with a vacuum runner for sucking gas in a die casting mold. By this, while venting the gas in the die casting mold is started, and when the molten metal is detected by the vacuum runner sensor provided in the vacuum runner, the intake port is closed, whereby the inside of the die casting mold is opened. In the degassing apparatus of the die casting mold for ending the degassing, before or after the molten metal is filled in the cavity of the die casting mold, and before the vacuum runner sensor detects the molten metal, The valve opening is reduced in advance.

According to a second aspect of the present invention, in the degassing apparatus for a die-casting die according to the first aspect, when the molten metal is detected by a cavity sensor provided in a cavity of the die-casting die, It is characterized in that the valve opening of the intake port is reduced in advance.

According to a third aspect of the present invention, in the gas degassing apparatus for a die-casting die according to the first aspect, the injection piston for filling the molten metal into the die-casting die reaches a predetermined position. It is characterized in that upon detection, the valve opening of the intake port is reduced in advance.

According to a fourth aspect of the present invention, there is provided a degassing apparatus for a die-casting die according to any one of the first to third aspects, based on an amount of molten metal flowing into the die-casting die. Characterized in that the valve opening degree of the intake port is reduced in advance in multiple stages or continuously.

In the degassing apparatus for a die-casting die according to the present invention having the above-described features, the degassing inside the die-casting die is started by opening the intake port, and thereafter, the degassing device is provided on the vacuum runner. When the vacuum runner sensor detects the molten metal, the air vent is closed by closing the intake port, thereby terminating the degassing in the die casting mold.

At this time, prior to closing the intake port,
The valve opening of the intake port is previously reduced from immediately before or immediately after the molten metal is filled into the cavity of the die casting mold to before the molten metal is detected by the vacuum runner sensor. Therefore, when the molten metal is detected by the vacuum runner sensor, the valve opening of the intake port is already small, so the time spent from when the molten metal is detected by the vacuum runner sensor to when the intake port is opened is measured. Is shortened. Accordingly, the valve can be closed before the molten metal reaches the intake port communicating with the vacuum runner, so that the occurrence of a problem that the molten metal infiltrates can be prevented.

Moreover, the valve opening of the intake port can be maintained immediately before or immediately after the cavity of the die casting mold is filled with the molten metal, so that the gas in the die casting mold can be sufficiently discharged. it can.

Here, as means for knowing immediately before or immediately after the cavity of the die casting mold is filled with the molten metal, for example, by detecting the molten metal with a cavity sensor provided in the cavity of the die casting mold, The molten metal in the cavity of the die casting mold is detected by directly detecting the molten metal in the cavity of the mold or by detecting that the injection piston for filling the molten metal in the die casting mold reaches a predetermined position. This is done by indirect detection.

Incidentally, as the molten metal flows into the die casting mold, the gas in the die casting mold decreases, and the minimum capacity required for discharging the gas in the die casting mold decreases. Alternatively, the valve opening of the intake port may be reduced in advance in a multi-step or continuous manner based on the amount of the molten metal flowing into the die casting mold.

That is, in the degassing apparatus for a die casting mold according to the present invention, the molten metal is detected by the vacuum runner sensor immediately before or immediately after the molten metal is filled in the cavity of the die casting mold before closing the intake port. Before the opening, the valve opening of the intake port is reduced in advance, and the time spent from when the molten metal is detected by the vacuum runner sensor to when the intake port is closed is shortened. The gas can be sufficiently discharged, and in addition, it can be ensured that a problem that the molten metal infiltrates is prevented from occurring.

Further, the reduction in the time spent from the time when the molten metal is detected by the vacuum runner sensor to the time when the intake port is closed is reduced because the required length and capacity of the vacuum runner are reduced. The die casting die to be manufactured can be made compact.

[0022]

Embodiments of the present invention will be described below with reference to the drawings. First, a first embodiment will be described. An apparatus (corresponding to "a die-casting apparatus for a die-casting die") for performing the ordinary die-casting method according to the first embodiment is similar to the apparatus 100 for performing the ordinary die-casting method shown in FIG. In order to prevent the formation of blowholes in products, as a countermeasure, exhausting gas from a die-casting mold is performed.

That is, as shown in FIG. 1, in the apparatus 30A for performing the ordinary die casting method of the first embodiment, the molten metal 2 is poured into the injection sleeve 12, and the shutoff valve 8 is at the open end position. In the initial state, the injection piston 1 is used to fill the cavity 21 of the die casting mold 1 with the molten metal 2.
When the injection operation by 1 is started, gas suction by the vacuum device 6 is started based on a gas release start signal from the position sensor 20 that is transmitted during the injection operation. Thereby, the gas in the die casting mold 1 can be discharged through the vacuum runner 7 and the gas vent 9.

When the molten metal 2 is detected by the vacuum runner sensor 3 provided in the vacuum runner 7, the control device 17 drives the hydraulic valve 15 to cause the piston 18 connected to the shutoff valve 8 to operate. Retract, shut off valve 8
Is moved to the position of the closed end, thereby preventing a problem that the molten metal 2 intrudes into the cylinder 10 and the vacuum device 6 and ends the gas suction by the vacuum device 6.

The position of the piston 18 connected to the shutoff valve 8 is detected by a position sensor 16 to determine whether the shutoff valve 8 is located at the open end or the closed end.

However, as shown in FIG. 1, in the apparatus 30A for performing the ordinary die casting method of the first embodiment, the molten metal 2
The upper cavity sensor 14 is provided above the cavity 21 as another sensor for detecting the pressure. Therefore, the molten metal 2 is detected by the upper cavity sensor 14.
Is detected, it is possible to know immediately before or immediately after the cavity 21 of the die casting mold 1 is filled with the molten metal 2.

When the molten metal 2 is detected by the upper cavity sensor 14 after the gas is sucked in the initial state, the control device 17 drives the hydraulic valve 15 so that the shutoff valve 8 and the shutoff valve 8 are closed. The connecting piston 18 is moved backward to move the shutoff valve 8 from the open end position to a position immediately before the closed end.

That is, in the apparatus 30A for performing the ordinary die casting method according to the first embodiment, as shown in FIG. 3, in the initial state, the shutoff valve 8 is set to the open end position A and communicates with the vacuum runner 7. The intake port 23 is opened. Thereafter, when the molten metal 2 is detected by the upper cavity sensor 14, the shutoff valve 8 is set to the position B immediately before the closed end, and the intake port 23 is closed.
The opening of the valve. Further, when the molten metal 2 is detected by the vacuum runner sensor 3, the shutoff valve 8 is closed at the closed end position C.
And the intake port 23 is closed.

As described in detail above, in the apparatus 30A for performing the ordinary die casting method of the first embodiment, the shutoff valve 8 is set to the open end position A, and the intake port 23 is opened to thereby obtain the die cast metal. Degassing of the mold 1 is started, and thereafter, when the vacuum runner sensor 3 provided in the vacuum runner 7 detects the molten metal 2, the shutoff valve 8 is set to the closed end position C, and the intake port 23 is closed. Then, the degassing in the die casting mold 1 is completed.

However, when the molten metal 2 is detected by the upper cavity sensor 14 provided in the cavity 21 of the die casting mold 1 during the degassing of the die casting mold 1, the shutoff valve 8 is closed immediately before the closing end. Position B, and the intake port 23
Is smaller. Therefore, immediately before or immediately after the cavity 21 of the die casting mold 1 is filled with the molten metal 2 (the upper cavity sensor 1
4 when the molten metal 2 is detected) and before the molten metal 2 is detected by the vacuum runner sensor 3.
The valve opening degree of No. 3 can be reduced in advance.

Accordingly, when the molten metal 2 is detected by the vacuum runner sensor 3, the valve opening of the intake port 23 is already small (the position B immediately before the closed end of the shutoff valve 8), so that the vacuum The time spent from when the melter 2 is detected by the runner sensor 3 to when the intake port 23 is closed is reduced.
Thereby, the intake port 23 can be closed before the molten metal 2 reaches the intake port 23 communicating with the vacuum runner 7 (the position C of the closed end of the shutoff valve 8), so that the molten metal 2 is supplied to the cylinder 10 or the cylinder 10. It is possible to prevent the inconvenience of entering the vacuum device 6.

In addition, the cavity 2 of the die casting mold 1
Immediately before or immediately after the molten metal 2 is filled in 1 (when the molten metal 2 is detected by the upper cavity sensor 14), the valve opening of the intake port 23 can be maintained (the shutoff valve 8).
At the open end position A), the function of discharging the gas in the die casting mold 1 can be sufficiently exhibited.

As the molten metal 2 flows into the die casting mold 1, the gas in the die casting mold 1 decreases, and the minimum capacity required to discharge the gas in the die casting mold 1 is as follows. descend. Therefore, immediately before or immediately after the molten metal 2 is filled into the cavity 21 of the die casting mold 1 (when the molten metal 2 is detected by the upper cavity sensor 14),
Until the intake port 23 is closed, the shutoff valve 8 is closed.
Is located at the position B immediately before the closed end, there is no problem in discharging the gas in the die casting mold 1. In other words, when the shutoff valve 8 is at the position B immediately before the closed end, the opening degree of the intake port 23 is set immediately before or immediately after the melt 21 is filled in the cavity 21 of the die casting mold 1 (the upper cavity sensor). Between the time when the molten metal 2 is detected at 14) and the time when the intake port 23 is closed, it is ensured that the gas in the die casting mold 1 is discharged without any trouble.

That is, in the apparatus 30A for performing the ordinary die-casting method of the first embodiment, prior to closing the intake port 23 (the position C of the closed end of the shutoff valve 8), the cavity 21 of the die-casting die 1 is closed. Immediately before or immediately after the molten metal 2 is filled (when the molten metal 2 is detected by the upper cavity sensor 14), and before the molten metal 2 is detected by the vacuum runner sensor 3, the intake port 23 is reduced in advance. (Position B immediately before the closed end of the shutoff valve 8), since the time spent from when the molten metal 2 is detected by the vacuum runner sensor 3 to when the intake port 23 is closed is reduced, the die casting die 1 It is possible to sufficiently discharge the gas inside, and in addition to this, it is also possible to ensure that a problem that the molten metal 2 enters is prevented.

Further, the reduction of the time spent from the time when the molten metal 2 is detected by the vacuum runner sensor 3 to the time when the intake port 23 is closed reduces the required length and capacity of the vacuum runner 7. Therefore, in the apparatus 30A for performing the ordinary die casting method of the first embodiment, as shown in FIG. 2, the vacuum runner 7 is provided linearly short,
As a result, the volume of the vacuum runner 7 can be reduced as compared with the apparatus 100 for performing the ordinary die casting method shown in the section of the prior art (see FIG. 8), so that the die casting mold 1 into which the vacuum runner 7 is engraved can be used. It can be compact.

Next, a second embodiment will be described.
Apparatus for performing the ordinary die-casting method of the second embodiment (corresponding to "a degassing apparatus for a die-casting die")
In order to prevent blow holes from being generated in a product in the same manner as in the apparatus 100 for performing the ordinary die casting method shown in FIG. 7 described in the related art, as a countermeasure, the gas in the die casting mold is discharged. That is being done.

That is, as shown in FIG. 4, in the apparatus 30B for performing the ordinary die casting method according to the second embodiment, the molten metal 2 is poured into the injection sleeve 12, and the shutoff valve 8 is at the open end position. In the initial state, the injection piston 1 is used to fill the cavity 21 of the die casting mold 1 with the molten metal 2.
When the injection operation by 1 is started, based on a degassing start signal from the sensor 20 transmitted in the middle of the operation,
Gas suction by the vacuum device 6 is started. This allows
The gas in the die casting mold 1 can be discharged through the vacuum runner 7 and the gas vent 9.

When the molten metal 2 is detected by the vacuum runner sensor 3 provided in the vacuum runner 7, the control device 17 drives the hydraulic valve 15 to cause the piston 18 connected to the shutoff valve 8 to operate. Retract, shut off valve 8
Is moved to the position of the closed end, thereby preventing the failure of the molten metal 2 from entering the cylinder 10 and the vacuum device 6 and stopping the gas suction by the vacuum device 6.

The position of the piston 18 connected to the shutoff valve 8 is detected by the position sensor 16 to determine whether the shutoff valve 8 is located at the open end or the closed end.

However, as shown in FIG. 4, in the apparatus 30B for performing the ordinary die casting method of the second embodiment, the molten metal 2
And a lower cavity sensor 13 provided below the cavity 21 as a sensor for detecting
An upper cavity sensor 14 is provided above the cavity 21.
Is provided. Therefore, the lower cavity sensor 13
Thus, it is possible to know immediately before or immediately after the melt 2 flows into the cavity 21 by detecting the melt 2. Further, by detecting the molten metal 2 with the upper cavity sensor 14, it is possible to know immediately before or immediately after the molten metal 2 is filled into the cavity 21 of the die casting mold 1. That is, by detecting the molten metal 2 with the upper cavity sensor 14 and the lower cavity sensor 13,
The amount of the molten metal 2 flowing into the die casting mold 1 can be known.

When the molten metal 2 is detected by the lower cavity sensor 13 after the gas is sucked in the initial state, the control device 17 drives the hydraulic valve 15 so that the shutoff valve 8 is closed. The connecting piston 18 is moved backward to move the shutoff valve 8 from the open end position to a position intermediate between the open end and the closed end. Further, when the molten metal 2 is detected by the upper cavity sensor 14, the control device 1
7 retreats the piston 18 connected to the shutoff valve 8 by driving the hydraulic valve 15, and moves the shutoff valve 8 from a position between the open end and the closed end to a position immediately before the closed end. Let me.

That is, in the apparatus 30B for performing the ordinary die-casting method according to the second embodiment, as shown in FIG. 5, in the initial state, the shutoff valve 8 is set to the open end position A and communicates with the vacuum runner 7. The intake port 23 to be opened is opened. Thereafter, when the molten metal 2 is detected by the lower cavity sensor 13, the shutoff valve 8 is set to a position D between the open end and the closed end, and the valve opening of the intake port 23 is reduced. Thereafter, when the molten metal 2 is detected by the upper cavity sensor 14 provided above the cavity 21, the shutoff valve 8 is set to the position B immediately before the closed end, and the valve opening of the intake port 23 is further reduced.
Further, when the molten metal is detected by the vacuum runner sensor 3, the shutoff valve 8 is set to the closed end position C, and the intake port 23 is closed.

Therefore, in the apparatus 30B for performing the ordinary die casting method of the second embodiment, the valve opening of the intake port 23 is set to 2 based on the amount of the molten metal 2 flowing into the die casting mold 1.
At the stage (the position D between the open end and the closed end of the shutoff valve 8 and the position B just before the closed end of the shutoff valve 8), the size is reduced.

As described above in detail, in the apparatus for performing the ordinary die casting method according to the second embodiment, the shut-off valve 8 is set to the open end position A, and the intake port 23 is opened, whereby the die-casting mold is opened. When the vacuum runner sensor 3 provided in the vacuum runner 7 detects the molten metal 2, the shutoff valve 8 is set to the closed end position C, and the intake port 23 is closed. This completes the degassing of the die casting mold 1.

However, when the molten metal 2 is detected by the upper cavity sensor 14 provided above the cavity 21 of the die casting mold 1 during the degassing of the die casting mold 1, the shutoff valve 8 is closed. , And the intake port 23 is made small. Therefore, prior to closing the intake port 23, immediately before or immediately after the molten metal 2 is filled into the cavity 21 of the die casting mold 1 (when the molten metal 2 is detected by the upper cavity sensor 14), the vacuum runner sensor 3 is started. The valve opening degree of the intake port 23 can be reduced in advance before the molten metal 2 is detected by the above method.

Therefore, when the molten metal 2 is detected by the vacuum runner sensor 3, the valve opening of the intake port 23 is already small (the position B immediately before the closed end of the shutoff valve 8). The time spent from when the melter 2 is detected by the runner sensor 3 to when the intake port 23 is closed is reduced.
Thereby, the intake port 23 can be closed before the molten metal 2 reaches the intake port 23 communicating with the vacuum runner 7 (the position C of the closed end of the shutoff valve 8), so that the molten metal 2 is supplied to the cylinder 10 or the cylinder 10. It is possible to prevent inconvenience that enters the vacuum device 6.

As the molten metal 2 flows into the die casting mold 1, the gas in the die casting mold 1 decreases, and the minimum capacity required for discharging the gas in the die casting mold 1 is as follows. Therefore, the valve opening of the intake port 23 may be reduced in advance in multiple stages based on the amount of the molten metal 2 flowing into the die casting mold 1.

Therefore, in the apparatus 30B for performing the ordinary die casting method according to the second embodiment, when the molten metal 2 is detected by the lower cavity sensor 13 provided below the cavity 21, the shutoff valve 8 is closed. When the molten metal 2 is detected by the upper cavity sensor 14 provided above the cavity, the shutoff valve 8 is moved to the position B immediately before the closed end. Thus, two stages (a position D between the open end and the closed end of the shutoff valve 8;
At a position B) immediately before the closed end of the shutoff valve 8, the valve opening of the intake port 23 is reduced.

Therefore, the cavity 2 of the die casting mold 1
Immediately before or immediately after the molten metal 2 is filled in 1 (when the molten metal 2 is detected by the upper cavity sensor 14), the valve opening of the intake port 23 can be maintained (the shutoff valve 8).
The position A of the open end and the position D) between the open end and the closed end of the shutoff valve 8 and the function of discharging the gas in the die casting mold 1 can be sufficiently exhibited.

That is, in the apparatus 30B for performing the ordinary die casting method of the second embodiment, prior to closing the intake port 23 (the position C of the closed end of the shutoff valve 8), the cavity 21 of the die casting mold 1 is closed. Immediately before or immediately after the molten metal 2 is filled (when the molten metal 2 is detected by the upper cavity sensor 14), and before the molten metal 2 is detected by the vacuum runner sensor 3, the intake port 23 is reduced in advance. (Position B immediately before the closed end of the shutoff valve 8), since the time spent from when the molten metal 2 is detected by the vacuum runner sensor 3 to when the intake port 23 is closed is reduced, the die casting die 1 It is possible to sufficiently discharge the gas inside, and in addition to this, it is also possible to ensure that a problem that the molten metal 2 enters is prevented.

Further, the reduction in the time spent from the time when the molten metal 2 is detected by the vacuum runner sensor 3 to the time when the intake port 23 is closed reduces the required length and capacity of the vacuum runner 7. Therefore, in the apparatus 30B for performing the ordinary die casting method of the second embodiment, as shown in FIG.
As a result, the volume of the vacuum runner 7 can be reduced as compared with the apparatus 100 for performing the ordinary die casting method shown in the section of the prior art (see FIG. 8), so that the die casting mold 1 into which the vacuum runner 7 is engraved can be used. It can be compact.

The present invention is not limited to the above embodiment, and various changes can be made without departing from the gist of the present invention. For example, in the apparatus 30B for performing the ordinary die casting method of the second embodiment, as shown in FIGS. 4 and 5, when the lower cavity sensor 13 detects the molten metal 2, the shutoff valve 8 is closed. From the position A, it is moved to a position D between the open end and the closed end. Further, when the upper cavity sensor 14 detects the molten metal 2, the shutoff valve 8 is moved from the position D between the open end and the closed end. , To the position C immediately before the closed end, and the intake port 23 is reduced in advance in two stages. However, if the function of discharging the gas in the die casting mold 1 can be sufficiently exhibited, a sensor for detecting the molten metal 2 is further provided in the die casting mold 1, and a shutoff valve 8 based on the newly installed sensor is provided. By moving, the intake port 23 may be reduced in advance in multiple stages.

Next, a third embodiment will be described.
Apparatus for performing the ordinary die-casting method of the third embodiment (corresponding to "a degassing apparatus for a die-casting die")
In order to prevent blow holes from being generated in a product in the same manner as in the apparatus 100 for performing the ordinary die casting method shown in FIG. 7 described in the related art, as a countermeasure, the gas in the die casting mold is discharged. That is being done.

That is, as shown in FIG. 6, in the apparatus 30C for performing the ordinary die casting method according to the third embodiment, the molten metal 2 is poured into the injection sleeve 12, and the shutoff valve 8 is at the open end position. In the initial state, when the injection operation by the injection piston 11 is started to fill the cavity 21 of the die casting mold 1 with the molten metal 2, the degassing from the position sensor 20 transmitted during the injection operation is started. Gas suction by the vacuum device 6 is started based on the signal. Thereby, the gas in the die casting mold 1 can be discharged through the vacuum runner 7 and the gas vent 9.

When the molten metal 2 is detected by the vacuum runner sensor 3 provided in the vacuum runner 7, the control device 17 drives the hydraulic valve 15 to cause the piston 18 connected to the shutoff valve 8 to operate. Retract, shut off valve 8
Is moved to the position of the closed end, thereby preventing a problem that the molten metal 2 intrudes into the cylinder 10 and the vacuum device 6 and ends the gas suction by the vacuum device 6.

Whether the shutoff valve 8 is located at the open end or the closed end is determined by the piston 18 connected to the shutoff valve 8.
Is detected by the position sensor 16.

However, as shown in FIG. 6, in the apparatus 30C for performing the ordinary die casting method according to the third embodiment, a sensor 24 for continuously detecting the position of the injection piston 11 is provided. Since the position of the injection piston 11 corresponds to the amount of the molten metal 2 flowing into the die casting mold 1, the position of the injection piston 11 is determined by the position sensor 24.
, The amount of the molten metal 2 flowing into the die casting mold 1 can be estimated.

Therefore, in the apparatus 30C for performing the ordinary die-casting method of the third embodiment, the position of the injection piston 11 corresponding to immediately before or immediately after the molten metal 2 is filled in the cavity 21 of the die-casting die 1 is set to a predetermined position. After the gas in the initial state is sucked, the injection piston 1
1 has reached the "predetermined position", the position sensor 24
Is detected, the control device 17 drives the hydraulic valve 15 to retract the piston 18 connected to the shutoff valve 8, and moves the shutoff valve 8 from the open end position to a position immediately before the closed end. Let me.

That is, in the apparatus 30C for performing the ordinary die casting method according to the third embodiment, as shown in FIG. 3, in the initial state, the shutoff valve 8 is set at the open end position A and communicates with the vacuum runner 7. The intake port 23 is opened. Thereafter, when the position sensor 24 detects that the injection piston 11 has reached the “predetermined position”, the shutoff valve 8 is set to the position B immediately before the closed end, and the valve opening of the intake port 23 is reduced.
Further, when the molten metal is detected by the vacuum runner sensor 3, the shutoff valve 8 is set to the closed end position C, and the intake port 23 is closed.

As described in detail above, in the apparatus 30C for performing the ordinary die casting method according to the third embodiment, the shut-off valve 8 is set to the open end position A, and the intake port 23 is opened, whereby the die-casting metal is opened. Degassing of the mold 1 is started, and thereafter, when the vacuum runner sensor 3 provided in the vacuum runner 7 detects the molten metal 2, the shutoff valve 8 is set to the closed end position C, and the intake port 23 is closed. Then, the degassing in the die casting mold 1 is completed.

However, when the position sensor 24 detects that the injection piston 11 has reached the "predetermined position" during the degassing of the die casting mold 1, the shut-off valve 8 is closed immediately before the closed end. And the intake port 23 is made smaller. Therefore, immediately before or immediately after the molten metal 2 is filled into the cavity 21 of the die casting mold 1 (the position sensor 24 detects that the injection piston 11 has reached the “predetermined position”) before closing the intake port 23. From the time) to before the molten metal 2 is detected by the vacuum runner sensor 3, the valve opening of the intake port 23 can be reduced in advance.

Accordingly, when the molten metal 2 is detected by the vacuum runner sensor 3, the valve opening of the intake port 23 is already small (the position B immediately before the closed end of the shutoff valve 8). The time spent from when the melter 2 is detected by the runner sensor 3 to when the intake port 23 is closed is reduced.
Thereby, the intake port 23 can be closed before the molten metal 2 reaches the intake port 23 communicating with the vacuum runner 7 (the position C of the closed end of the shutoff valve 8), so that the molten metal 2 is supplied to the cylinder 10 or the cylinder 10. It is possible to prevent the inconvenience of entering the vacuum device 6.

Moreover, the cavity 2 of the die casting mold 1
Immediately before or after filling 1 with the molten metal 2 (position sensor 2
Until the injection piston 11 reaches the "predetermined position" at 4), the valve opening of the intake port 23 can be maintained (the position A of the open end of the shutoff valve 8). Thereby, the function of discharging the gas in the die casting mold 1 can be sufficiently exhibited.

As the molten metal 2 flows into the die casting mold 1, the gas in the die casting mold 1 decreases, and the minimum capacity required for discharging the gas in the die casting mold 1 is as follows. descend. Therefore, immediately before or immediately after the cavity 21 of the die casting mold 1 is filled with the molten metal 2 (when the position sensor 24 detects that the injection piston 11 has reached a “predetermined position”), the intake port 23 is closed. Until that time, even if the shutoff valve 8 is at the position B immediately before the closed end, there is no problem in discharging the gas in the die casting mold 1. In other words, when the shutoff valve 8 is at the position B immediately before the closed end, the valve opening of the intake port 23 is:
Immediately before or after the cavity 21 of the die casting mold 1 is filled with the molten metal 2 (the position sensor 24 detects the injection piston 11
From when it has reached a “predetermined position” until the intake port 23 is closed, it is ensured that the gas in the die casting mold 1 is not hindered from being discharged. ing.

That is, in the apparatus 30C for performing the ordinary die-casting method of the third embodiment, prior to closing the intake port 23 (the position C of the closed end of the shutoff valve 8), the cavity 21 of the die-casting die 1 is closed. From immediately before or immediately after the molten metal 2 is filled (when the position sensor 24 detects that the injection piston 11 has reached a "predetermined position"), and before the molten metal 2 is detected by the vacuum runner sensor 3.
The intake port 23 is reduced in advance (the position B immediately before the closed end of the shutoff valve 8), and the time spent from when the molten metal 2 is detected by the vacuum runner sensor 3 to when the intake port 23 is closed is taken. Since it is shortened, the gas in the die casting mold 1 can be sufficiently discharged, and in addition to this, it is also possible to ensure that the occurrence of a problem that the molten metal 2 enters the vacuum device 6 or the like can be prevented. .

Further, the reduction in the time spent from the time when the molten metal 2 is detected by the vacuum runner sensor 3 to the time when the intake port 23 is closed reduces the required length and capacity of the vacuum runner 7. Therefore, in the apparatus 30C for performing the ordinary die casting method according to the third embodiment, as shown in FIG.
As a result, the volume of the vacuum runner 7 can be reduced as compared with the apparatus 100 for performing the ordinary die casting method shown in the section of the prior art (see FIG. 8), so that the die casting mold 1 into which the vacuum runner 7 is engraved can be used. It can be compact.

It should be noted that the present invention is not limited to the above embodiment, and various changes can be made without departing from the gist of the present invention.

For example, in the apparatus 30C for performing the ordinary die casting method according to the third embodiment, as shown in FIGS. 3 and 6, immediately before or immediately after the molten metal 2 is filled in the cavity 21 of the die casting mold 1, When the position sensor 24 detects that the injection piston 11 has reached the “predetermined position”, the shut-off valve 8 is moved from the open position A to the closed position. By moving to the position B immediately before the above, the intake port 23 is reduced in advance.

However, if the function of discharging the gas in the die casting mold 1 can be sufficiently exhibited, the “predetermined position”
In addition, the position of the injection piston 11 corresponding to immediately before or immediately after the molten metal 2 flows into the die casting mold 1 is set as a “new position”, and the position sensor detects that the injection piston 11 has reached the “new position”. At the time of detection at 24, as shown in FIG. 5, the shutoff valve 8 is moved from the open end position A to the intermediate position D between the open end and the closed end, so that the intake port 23 is preliminarily controlled in two stages. It may be smaller.

In the apparatus 30C for performing the ordinary die casting method according to the third embodiment, the position of the injection piston 11 is continuously detected by the position sensor 24, so that the molten metal 2 flowing into the die casting mold 1 is removed. If the function of discharging the gas in the die casting mold 1 can be sufficiently exhibited, the position sensor 2 can be estimated.
By continuously moving the shutoff valve 8 in accordance with the position of the injection piston 11 continuously detected in step 4, the valve opening of the intake port 23 may be continuously reduced in advance.
However, from the viewpoint of sufficiently exhibiting the function of discharging gas from the die casting mold 1, it is not necessary to continuously move the shutoff valve 8 from the beginning when the molten metal 2 flows into the die casting mold 1. Absent.

[0071]

According to the degassing apparatus of the die casting mold of the present invention, the molten metal is detected by the vacuum runner sensor immediately before or immediately after the molten metal is filled into the cavity of the die casting mold before closing the intake port. Before you do
Exhaust gas in the die-casting mold is reduced because the valve opening of the intake port is reduced in advance, and the time spent from when the molten metal is detected by the vacuum runner sensor to when the intake port is closed is reduced. Can be sufficiently exhibited, and in addition, it can be ensured that the occurrence of the problem that the molten metal infiltrates is prevented.

Further, the reduction in the time spent from when the molten metal is detected by the vacuum runner sensor to when the intake port is closed is reduced, because the required length and required capacity of the vacuum runner are reduced. The die casting die to be manufactured can be made compact.

[Brief description of the drawings]

FIG. 1 is a sectional view of an apparatus for performing a normal die casting method according to a first embodiment.

FIG. 2 is a front view of one die-casting die in the apparatus for performing the ordinary die-casting method according to the first, second, and third embodiments, and is provided on the other die-casting die; FIG. 5 is a diagram showing a positional relationship with a vacuum runner.

FIG. 3 is a diagram for explaining a valve opening degree of an intake port in an apparatus for performing the ordinary die casting method according to the first embodiment and the third embodiment.

FIG. 4 is a sectional view of an apparatus for performing a normal die casting method according to a second embodiment.

FIG. 5 is a diagram for explaining a valve opening degree of an intake port in an apparatus for performing a normal die casting method according to a second embodiment.

FIG. 6 is a sectional view of an apparatus for performing a normal die casting method according to a third embodiment.

FIG. 7 is a cross-sectional view of an apparatus for performing a conventional ordinary die casting method.

FIG. 8 is a front view of one die-casting die in a conventional apparatus for performing the ordinary die-casting method, showing a positional relationship with a vacuum runner provided on the other die-casting die.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Die-casting mold 2 Melt 3 Sensor for vacuum runner 7 Vacuum runner 8 Shut-off valve 11 Injection piston 13 Sensor for lower cavity 14 Sensor for upper cavity 21 Cavity 23 Inlet 24 Position sensor 30A, 30B, 30C Normal die-casting method is performed. apparatus

Claims (4)

[Claims] 1. A gas vent in the die casting mold is started by opening an intake port communicating with a vacuum runner for sucking gas in the die casting mold, and the vacuum runner is provided in the vacuum runner. When the molten metal is detected by the vacuum runner sensor, in the die casting mold degassing device that terminates the gas venting in the die casting mold by closing the intake port, the cavity of the die casting mold is A degassing device for a die-casting die, characterized in that the valve opening of the suction port is reduced in advance immediately before or immediately after the molten metal is filled and before the molten metal is detected by the vacuum runner sensor. 2. The degassing apparatus for a die-casting die according to claim 1, wherein when a molten metal is detected by a cavity sensor provided in a cavity of the die-casting die, the valve opening of the intake port is previously determined. A degassing device for a die-casting die, characterized in that it is made smaller. 3. The degassing device for a die-casting die according to claim 1, wherein when detecting that an injection piston for filling the molten metal in the die-casting die reaches a predetermined position, the suction port. A valve opening degree of the die-casting mold is reduced beforehand. 4. The degassing apparatus for a die-casting die according to claim 1, wherein the die-casting die is a multi-stage or continuously based on the amount of molten metal flowing into the die-casting die. A degassing device for a die-casting mold, wherein the valve opening of the intake port is reduced in advance.