JPH0899164A - Die for die casting - Google Patents

Abstract

PURPOSE: To obtain a die for die casting, in which a cavity and the misrun are not developed in a product. CONSTITUTION: An atmosphere release valve 17 and an air purge switch valve 18 are parallel connected to a gas discharge hole 16 in the die 1, and the air purge switch valve 18 is connected to the air purge means 19 and the atmosphere release valve 17 is released to the atmosphere. Further, a pressure detecting means 20 is provided between the air purge means 19 and the gas discharge hole 16. The atmosphere release valve 17, air purge switch valve 18, air purge means 19 and pressure detecting means 20 are connected to a control device 21, and the control device 21 is connected to a casting machine. In the air purge means 19, an air source as the air supplying source, an air filter for cleaning the air supplied from the air source and a pressure regulating valve for executing the pressure regulate of the air are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a die casting mold having a gas vent passage.

[0002]

2. Description of the Related Art Conventionally, a device disclosed in Japanese Utility Model Laid-Open No. 52059/1985 is known as a technique for degassing a die casting mold. In the invention described in the above publication, a vent made of ceramics is fixed to the opening of the gas vent hole on the cavity side to facilitate venting in the vent hole which leads from the cavity to the atmosphere.

[0003]

However, in the case of the above-mentioned conventional die, as the casting progresses, the die becomes soiled with a release agent, or aluminum sticks to the die due to baking. When casting is further advanced in this state, aluminum adheres to the passage of the gas vent hole communicating with the cavity, and if the amount of adhering increases, the molten aluminum will be cast without sufficient degassing of the cavity, For this reason, cavities are formed in the product, and poor flow of molten metal occurs.

Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide a die-casting die that does not cause cavities or defective molten metal flow in the product during casting.

[0005]

In order to achieve the above object, the present invention is a die casting mold having a gas vent passage for discharging gas and air in the die to the outside of the die, which is located at the end of the gas vent passage. An atmosphere release valve and an air purge on-off valve are connected in parallel to the gas outlet, an air purge means is connected to the air purge on-off valve, a pressure detection means is provided between the air purge means and the gas outlet, and The air purge on-off valve, the air purge means, and the pressure detection means are connected to the control device, and the control device is connected to the casting machine.

An atmosphere release valve and an air purge on-off valve are connected in parallel to the gas release port at the end of the gas vent passage, and an air purge means is connected to the air purge on-off valve, and between the air purge means and the gas release port. Is equipped with air flow rate detection means,
The air release valve, the air purge opening / closing valve, the air purge means, and the air flow rate detecting means are connected to the control device, and the control device is connected to the casting machine.

[0007]

In the operation according to claim 1, the mold is clamped before the casting is started. In this state, the atmosphere release valve is closed. Next, the injection plunger is retracted to the maximum.
In this state, the cavity is sealed except for the hot water supply port of the injection sleeve. Open the air purge on-off valve and send air into the cavity. This air flows into the cavity through the degassing passage, from the cavity to the gate, from the gate to the runner, from the runner to the injection sleeve, passes through the injection sleeve to the hot water inlet, and is released to the atmosphere.

The air pressure at this time is detected by the pressure detecting means, and the detected value is sent to the control device and input as an initial value. Next, continuous casting is started. Continuous casting includes a casting process, a product removal process, and a post mold clamping process.
At the end of the post mold clamping step, the atmosphere release valve is closed, the air purge opening / closing valve is opened, and air is sent into the cavity.

The air pressure at this time is detected by the pressure detecting means, and the detected value is sent to the control device and compared with the initial value input to the control device in advance. In this case, if the detected value after the rear mold is clamped is larger than the initial value, it is understood that the gas vent passage is clogged, dirt or aluminum adheres, and the gas escape is deteriorated. Thereby, the state of the gas vent passage can be detected.

According to the second aspect of the present invention, the mold is clamped before the casting is started. In this state, the atmospheric valve is closed. Next, the injection plunger is retracted to the maximum.
Open the air purge on-off valve and send air into the cavity. This air flows into the cavity through the degassing passage, from the cavity to the gate, from the gate to the runner, from the runner to the injection sleeve, passes through the injection sleeve to the hot water inlet, and is released to the atmosphere.

The air flow rate at this time is detected by the air flow rate detecting means, and the detected value is sent to the control device and input as an initial value. Next, continuous casting is started. For continuous casting,
There are a casting process, a product removing process, and a post mold clamping process. At the end of the post mold clamping process, the atmosphere release valve is closed, the air purge on-off valve is opened, and air is sent into the cavity.

The air flow rate at this time is detected by the air flow rate detecting means, and the detected value is sent to the control device and compared with the initial value which is input to the control device in advance. In this case, if the detected value after clamping the rear mold is smaller than the initial value, it can be seen that the gas vent passage is clogged, dirt or aluminum adheres, and gas escape is deteriorated. The condition of the passage can be detected.

[0013]

Embodiments of the present invention will be specifically described below with reference to the drawings. In each of the embodiments, common points will be denoted by common reference numerals and corresponding description will be omitted. FIG. 1 is a schematic cross-sectional view of a die casting mold used in the present invention.

In FIG. 1, the die-casting die is arranged such that the fixed die 1 and the movable die 3 face each other and the die can be opened at the position PL. A cavity 7 is formed by the fixed die 1 and the movable die 3 on the opposing surfaces of the two, and a runner 11, a gas vent passage 15 and a gas discharge port 16 are continuously provided in the cavity 7.

The fixed die 1 is fixed to the fixed die plate 2, and the injection sleeve 13 is fixed to the fixed die 1 and the fixed die plate 2.
While penetrating through and protruding to the surface of the die plate 2,
It is fixed between the fixed die 1 and the fixed die plate 2 via the protrusion 13a. A plunger tip 12 is movably disposed inside the injection sleeve 13, a hot water supply port 14 is opened on a side surface of the protruding portion, and a fixed die 1 side opening portion of the injection sleeve 13 is provided. The runner 11 is connected and communicates with the cavity 7.

On the other hand, the movable die 3 is fixed to the movable die plate 6 via the spacer block 4 and the mounting plate 5. A push-out plate 9 is provided between the movable mold 3 and the mounting plate 5, and the push-out pin 8 is provided on the push-out plate 9.
Also, one end of the return pin 10 is fixed. The push-out pin 8 and the return pin 10 are slidably provided so as to penetrate the movable mold 3. The tip of the return pin 10 contacts the PL surface in the mold clamped state, and the tip of the push-out pin 8 is in the surface position of the cavity 7. Yes, they are in the most retracted position with the push plate 9.

[0017]

[Embodiment 1] FIG. 2 is a schematic view of a detector for detecting the state of the gas vent passage according to Embodiment 1, and this embodiment is shown in FIG. 2 for the gas discharge port 16 of the die casting mold. A detection device for detecting the state of the gas vent passage is provided.

As shown in FIG. 2, an atmosphere release valve 17 and an air purge on-off valve 18 are connected in parallel to the gas discharge port 16, and the air purge on-off valve 18 has an air purge means 19.
Are connected, and one of the atmosphere release valves 17 is open to the atmosphere. Further, the air purge means 19 and the gas discharge port 16
A pressure detecting means 20 is provided between and.

The atmosphere release valve 17, the air purge opening / closing valve 18, the air purging means 19, and the pressure detecting means 20 are provided as a control device 21.
The control device 21 is connected to the casting machine 25. The air purge means 19 includes an air source (not shown) as an air supply source, an air filter (not shown) for cleaning the air supplied from the air source, and a pressure adjusting valve (not shown) for adjusting the pressure of the air. And).

Next, the operation of the die-casting die having this structure will be described. Before starting the casting, first, the fixed die 1 and the movable die 3 are clamped by the casting machine 25, the atmosphere release valve 17 is closed, and the plunger tip 12 is closed.
To the maximum. As a result, the cavity 7 is sealed except for the hot water supply port 14 of the injection sleeve 13.

When the air purge on-off valve 18 is opened, the air purge means 19 sends air to the gas discharge port 16. The air sent to the gas discharge port flows through the gas vent passage 15 into the cavity 7, from the cavity 7 to the runner 11, from the runner 11 to the injection sleeve 13, and from the injection sleeve 13 to the hot water supply port 14 to the atmosphere. Be released inside.

The pressure of the air at this time is detected by the pressure detecting means 20, the detected value is sent to the control device 21 and inputted as an initial value, and the next continuous casting step is started. In casting, the fixed mold 1 and the movable mold 3 are first clamped by the casting machine 25. At this time, the atmosphere release valve 17 is closed and the air purge opening / closing valve 18 is kept closed.

After that, the injection sleeve 1 is fed from the hot water supply port 14.
Molten metal is poured into 3, and the molten metal is pushed by the plunger tip 12. The molten metal passes through the runner 11 and is filled in the cavity 7. At this time, as the molten metal is filled, the air and the generated gas in the cavity 7 pass through the gas vent passage 15, the gas discharge port 16 and the atmosphere release valve 17 and are discharged to the outside of the mold, thus ending the casting process.

After the casting process is completed and the molten metal is solidified, the mold is opened by the casting machine, and the pushing plate 9 is moved to the PL side by a driving source (not shown). As a result, the tip of the push pin 8 projects into the cavity 7, and the cast product is released from the movable mold 3. At this time, the return pin 10 also projects to the PL side at the same time as the push pin 8.

After releasing the mold, the mold is clamped by the casting machine 25. At this time, the tip of the return pin 10 abuts against the surface of the fixed mold 1 and is pushed, whereby the push plate 9 and the push pin 8 are moved as the movable mold 3 approaches the surface of the fixed mold 1.
Is pushed back to the original position at the same time and the mold clamping is completed.

In this state, the atmosphere release valve 17 is closed, the air purge opening / closing valve 18 is opened, and air is sent into the cavity 7. The pressure at this time is detected by the pressure detection means 20, and the detected value is sent to the control device 21 and compared with the initial value which has been input to the control device 21 in advance. After that, the same process is repeated.

In this case, if the detected value after the mold is clamped is larger than the initial value, it is understood that the gas vent passage 15 is clogged, dirt or aluminum adheres, and the gas escape is deteriorated. Therefore, the state of the gas vent passage 15 can be detected by this. Therefore, the pressure detection means 20 checks how much the detected value increases compared to an initial value input in advance, which causes a nest or a defective molten metal flow in the product, and inputs the pressure to the control device 21 as an upper limit. Therefore, if the casting is stopped when the upper limit is exceeded, defects can be prevented in advance.

According to the present embodiment, by detecting the gas pressure in the gas vent passage 15 by the pressure detecting means 20, it is possible to prevent casting in the state where the product has a cavity or defective molten metal flow. You can

[0029]

[Embodiment 2] FIG. 3 is a schematic view of a detector for detecting the state of the gas vent passage according to Embodiment 2 of the present invention. In this embodiment, a detection device for detecting the state of the gas vent passage shown in FIG. 3 is provided for the gas discharge port 16 of the die casting mold.

In the detector for detecting the state of the gas vent passage of this embodiment, an atmosphere release valve 17 and an air purge on-off valve 18 are connected in parallel to the gas discharge port 16, and the air purge on-off valve 18 has an air purge means 19. Are connected, and one of the atmosphere release valves 17 is open to the atmosphere. Further, an air flow rate detecting means 22 is provided between the air purging means 19 and the gas discharge port 16.

The atmosphere release valve 17, the air purge opening / closing valve 18, the air purging means 19, and the air flow rate detecting means 22 are connected to a control device 21, and the control device 21 is connected to a casting machine 25.

Next, the operation of the die-casting die having this structure will be described. Before starting the casting, first, the fixed die 1 and the movable die 3 are clamped by a casting machine, the atmosphere release valve 17 is closed, and the plunger tip 12 is retracted to the maximum. As a result, the cavity 7 is sealed except for the hot water supply port 14 of the injection sleeve 13.

When the air purge on-off valve 18 is opened, air is sent to the gas discharge port 16 by the air purge means 19. The air sent to the gas discharge port 16 flows through the gas vent passage 15 into the cavity 7, from the cavity 7 to the runner 11, from the runner 11 to the injection sleeve 13, passes from the injection sleeve 13 to the hot water supply port 14, and exits to the atmosphere. Be released inside.

The air flow rate at this time is detected by the air flow rate detecting means 22.
Detected, and the detected value is sent to the control device 21 and input as an initial value, and the next continuous casting process is started. First, the fixed mold 1 and the movable mold 3 are clamped by the casting machine 25. At this time, the atmosphere release valve 17 is kept open and the air purge opening / closing valve 18 is kept closed.

After that, the injection sleeve 13 is supplied from the hot water supply port 14.
By pouring the molten metal into the inside and pushing it with the plunger tip 12, the molten metal passes through the runner 11 and enters the cavity 7. At this time, as the molten metal is filled, the air and the generated gas in the cavity 7 pass through the gas vent passage 15, the gas discharge port 16 and the atmosphere release valve 17 and are discharged to the outside of the mold, thus ending the casting process.

After the casting is completed and the molten metal is solidified, the mold is opened by the casting machine, and the extruding plate 9 is moved to the PL side so that the tip of the extruding pin 8 projects into the cavity 7 and the cast product is a movable mold. It is released from 3. At this time, the return pin 10 also projects to the PL side at the same time as the push pin 8.

After releasing the mold, the mold is clamped by the casting machine 25. At this time, the tip of the return pin 10 abuts on the surface of the fixed die 1, and as the movable die 3 approaches the surface of the fixed die 1, the return pin 10 is pushed back to the original position together with the pushing plate 9 and the pushing pin 8. The tightening is complete.

In this state, the atmosphere release valve 17 is closed, the air purge opening / closing valve 18 is opened, and air is sent into the cavity 7. The air flow rate at this time is detected by the air flow rate detection means 22, and the detected value is sent to the control device 21 in advance.
Compare with the initial value entered in 1. After that, the same process is repeated.

In this case, if the detected value after mold clamping is smaller than the initial value, it can be understood that the gas vent passage 15 is clogged, dirt or aluminum adheres, and gas escape is deteriorated. . Thereby, the state of the gas vent passage 15 can be detected. Therefore, the air flow rate detecting means 22 examines how much the detected value increases compared to the initial value input in advance, which causes a nest or a defective molten metal flow in the product, and inputs the flow rate to the control device 21 as a lower limit. By doing so, if the casting is stopped when the lower limit is exceeded, defects can be prevented in advance.

According to the present embodiment, by detecting the gas flow rate in the gas vent passage 15 by the air flow rate detecting means 22, it is possible to prevent casting in a state where the product has a cavity or a defective molten metal flow. be able to.

[0041]

Third Embodiment FIG. 4 is a schematic view of a detection device for detecting the state of the gas vent passage. In this embodiment, a detection device for detecting the state of the gas vent passage shown in FIG. 4 is provided for the gas discharge port 16 of the die casting mold.

In the detector for detecting the state of the gas vent passage of this embodiment, an atmosphere release valve 17 and an air purge on-off valve 18 are connected in parallel to the gas outlet 16, and the air purge on-off valve 18 has an air purge means 19. Is connected, and one atmosphere release valve 17 is connected to the vacuum device 23. Further, a pressure detecting means 20 is provided between the air purging means 19 and the gas discharge port 16.

The atmosphere release valve 17, the air purge opening / closing valve 18, the air purge means 19 and the pressure detecting means 20 are provided as a control device 21.
The controller 21 is connected to a casting machine (not shown).

Next, the operation of the die-casting die having this structure will be described. Before starting the casting, first, the fixed die 1 and the movable die 3 are clamped by the casting machine 25, the atmosphere release valve 17 is closed, and the plunger tip 12 is retracted to the maximum. As a result, the cavity 7 is sealed except for the hot water supply port 14 of the injection sleeve 13.

When the air purge opening / closing valve 18 is opened, air is sent to the gas discharge port 16 by the air purge means 19. The air sent to the gas discharge port 16 flows through the gas vent passage 15 into the cavity 7, from the cavity 7 to the runner 11, from the runner 11 to the injection sleeve 13, and from the injection sleeve 13 to the hot water supply port 14. Released into the atmosphere.

The air pressure at this time is detected by the air pressure detecting means 2
0 is detected, the detected value is sent to the control device 21 and input as an initial value, and the next continuous casting process is started.
First, the fixed mold 1 and the movable mold 3 are clamped by the casting machine 25. At this time, the atmosphere release valve 17 is kept open and the air purge opening / closing valve 18 is kept closed.

Thereafter, the injection sleeve 13 is fed from the hot water supply port 14.
When the molten metal is poured into the cavity and the plunger tip 12 is passed through the hot water supply port 14 to close the cavity 7, the vacuum device 23 evacuates the cavity 7. Next, the molten metal is pushed by the plunger tip 12, passes through the runner 11, and is filled in the cavity 7. At this time, as the molten metal is filled, the air and the generated gas in the cavity 7 are discharged to the outside of the mold by the vacuum device 23 through the gas vent passage 15, the gas discharge port 16 and the atmosphere release valve 17, and the casting process is performed. finish.

After the casting process is completed and the molten metal is solidified, the mold is opened by the casting machine 25, and the extruding plate 9 is moved to the PL side by a driving source (not shown) so that the tip of the extruding pin 8 enters the cavity 7. The cast product is ejected and released from the movable mold 3. At this time, return pin 10
Also protrudes to the PL side at the same time.

After releasing the mold, the mold is clamped by a casting machine. At this time, the tip of the return pin 10 abuts on the surface of the fixed die 1, and as the movable die 3 approaches the surface of the fixed die 1, the return pin 10 is pushed back to the original position together with the pushing plate 9 and the pushing pin 8. Complete the tightening.

In this state, the atmosphere release valve 17 is closed, the air purge opening / closing valve 18 is opened, and air is sent into the cavity 7. The air pressure at this time is detected by the air pressure detecting means 20, and the detected value is sent to the control device 21 to advance the control device 2 in advance.
Compare with the initial value entered in 1. After that, the same process is repeated.

In this case, if the detected value after the mold clamping is larger than the initial value, it is understood that the gas vent passage 15 is clogged, dirt or aluminum adheres, and the gas escape is deteriorated. . Thereby, the state of the gas vent passage 15 can be detected. Therefore, the pressure detecting means 20 checks how much the detected value increases compared with the initial value input in advance, which causes a nest or a defective molten metal flow in the product, and the upper limit of the pressure is input to the control device 21. Therefore, if the casting is stopped when the upper limit is exceeded, defects can be prevented in advance.

According to the present embodiment, the gas pressure in the gas vent passage 15 is detected by the pressure detecting means 20, so that the clogging of the gas vent passage can be confirmed even if the vacuum degree on the vacuum device side reaches the specified value. can do. As a result, it is possible to prevent casting in a state in which the product has cavities and defective molten metal flow.

[0053]

According to the present invention, by detecting the condition of the gas vent passage, it is possible to prevent casting defects due to cavities and molten metal flow defects from occurring.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a die casting mold used in the present invention.

FIG. 2 is a schematic diagram of a detection device for detecting the state of the gas vent passage according to the first embodiment of the present invention.

FIG. 3 is a schematic diagram of a detection device that detects a state of a gas vent passage according to a second embodiment of the present invention.

FIG. 4 is a schematic diagram of a detection device for detecting a state of a gas vent passage according to a third embodiment of the present invention.

[Explanation of symbols]

 1 Fixed type 2 Fixed die plate 3 Movable type 4 Spacer block 5 Mounting plate 6 Movable die plate 7 Cavity 8 Extrusion pin 9 Extrusion plate 10 Return pin 11 Runner 12 Plunger tip 13 Injection sleeve 14 Hot water inlet 15 Gas vent passage 16 Gas release Outlet 17 Atmosphere release valve 18 Air purge release valve 19 Air purge means 20 Pressure detection means 21 Control device 22 Air flow rate detection means 23 Vacuum device 35 Casting machine

Claims (2)

[Claims] 1. In a die-casting die having a gas vent passage for exhausting gas and air in the die to the outside of the die, an atmosphere release valve and an air purge on-off valve are arranged in parallel at a gas discharge port at the end of the gas vent passage. The air purge opening / closing valve is connected to the air purging means, the pressure detecting means is provided between the air purging means and the gas discharge port, and the atmosphere opening valve, the air purge opening / closing valve, the air purging means and the pressure detecting means are controlled. A die-casting die, characterized in that the control device is connected to the casting machine. 2. A die casting mold having a gas vent passage for exhausting gas and air inside the die to the outside of the die, wherein an atmosphere release valve and an air purge on-off valve are arranged in parallel at a gas discharge port at the end of the gas vent passage. The air purge opening / closing valve is connected to the air purging means, the air flow detecting means is provided between the air purging means and the gas discharge port, and the atmosphere release valve, the air purge opening / closing valve, the air purging means and the air flow detecting means are connected. A die casting mold characterized in that it is connected to a control device, and the control device is connected to a casting machine.