JP5099420B2 - Degassing device, pressure receiving valve, and method of stably operating pressure receiving valve - Google Patents

Description

The present invention relates to a gas venting device used in a die casting mold, a pressure receiving valve used in the gas venting device, a pressure receiving valve in the gas venting device, and a stable operation method of the pressure receiving valve in the gas venting device.

As a two-valve type gas venting device, as shown in FIG. 8, a pressure receiving valve 3 that operates by increasing the molten metal pressure is provided at the outlet side of the gas vent groove 10 provided in communication with the cavity of the product molding die. provided with a closing valve 6, the lever 9 to close the closing valve 6 in operation of the pressure receiving valve 3 provided further on the open swing side of the lever 9, the closing piston 21 for pressing the lever 9 in the closing direction, the lever the closed swinging side of 9, have also the is known comprising an opening piston 20 for pressing the lever 9 in the opening direction.
The pressure receiving valve in this type of degassing device is closed by receiving the molten metal pressure, and is opened while the mold is opened, and is also moved away from the lever.

JP 2001-47187 A JP 2002-96151 A JP 2002-144008 A JP 2002-144209 A JP 2002-361364 A JP 2003-126952 A

Since the lever in the conventional gas venting device and the pressure receiving valve rod constituting the pressure receiving valve can be freely moved while the mold is open, the pressure receiving valve rod closes due to vibration when the mold closing vibration is applied. there were. In addition, a part of the molten metal that has entered the pressure receiving valve from the cavity at high speed and high pressure enters the gap between the pressure receiving valve rod and the pressure receiving bush, and a part thereof solidifies and accumulates, thereby improving the operability of the pressure receiving valve rod. There was also a decrease.

Accordingly, the present invention has been made in view of such problems of the prior art, and the object of the present invention is to provide a gas venting device used in vacuum die casting and a pressure receiving valve used in the gas venting device. It is to improve the reliability, in particular, to improve the stable operation method of the pressure receiving valve, and to improve the reliability and productivity in vacuum die casting.

In order to achieve the above object, a degassing apparatus according to the present invention, as claimed in claim 1 , closes the pressure receiving valve on the inlet side of the degassing groove provided in sequential communication with the cavity of the product mold and closed on the outlet side. the valve is arranged, at least provided with a lever chamber to the closed side of the pressure valve, comprising a lever for transmitting movement of the pressure receiving valves operating at impact load of the molten metal that has flowed into the gas vent groove in the lever chamber in the closed valve, the pressure valve stem receiving valve reciprocating I along with the pressure receiving bush, the closure valve is provided with a closing valve rod which reciprocates along a closed bushing, the notch tip portion of the lever passes through the closed bushing, closing In the gas venting device having a lateral groove that communicates with the notch in the valve stem and engages with the tip of the lever,
A connection port for compressed air that presses the closing valve rod in the opening direction is provided on the closing side of the closing valve, and the pressure receiving valve rod of the pressure receiving valve has a body portion having a non-circular cross section, and the body portion and the pressure receiving bush Is connected to the pressure receiving bush when the mold is clamped and the molten metal pressure flowing into the gas vent groove is received from the initial closed state, and the latter is closed. One end of the communication path is sequentially communicated with the connection port through the lever chamber and the notch, and the other side is opened toward the gas vent groove. It is characterized by that .

Here, the gas vent groove refers to one that communicates with the cavity, allows gas generated in the cavity to pass therethrough, and restricts the inflow of the molten metal.
Here, the closing valve is arranged on the outlet side of the gas vent groove and opens and closes the end portion of the gas vent groove, which allows gas to pass from the cavity to the vacuum device and prevents the melt from passing. As long as it is in direct contact with the fluid and has low sliding resistance and facilitates the passage of gas, the shape is arbitrary.
Here, the lever is transmitted to the closing operation of the pressure receiving valve closing the valve, the melt closes the closure valve before reaching the closing valve, in the mold opening process, the closing valve is returned to the open state from the closed state Accordingly, the lever chamber is a vacant chamber in which the lever can be swung freely and the air leak is small.
Here, compressed air (hereinafter referred to as air) refers to the air being fed by the air pressure circuit, and the connection port refers to the one that connects the air pressure circuit to the degassing device.
Here, the initial closed state refers to a state where one end of the pressure receiving valve rod is slightly inserted into the pressure receiving bush, and the late closed state refers to a state where the molten metal pressure flowing into the gas vent groove from the initial closed state is further closed. The state of sliding in the direction.

A second aspect of the present invention is the pressure receiving valve used in the degassing device according to the first aspect,
The pressure- receiving valve rod of the pressure-receiving valve has a valve portion on one end side of the body portion, and a flange that restricts the opening of the pressure-receiving valve rod on the other end side, and the valve rod body portion has an elliptical or rectangular non-circular cross section. The pressure receiving bush of the pressure receiving valve is provided with a hot water sump that widens toward the degassing groove on one end side of the cylindrical portion, and a lever on the other end side. It has a communication passage that communicates with the chamber, and the valve part of the pressure- receiving valve rod receives the molten metal pressure flowing into the gas vent groove from the initial closed state that is inserted into the pressure-receiving bush and enters the late-closed state. Slide toward the degassing groove side, enter at least the hot water reservoir from inside the bush cylinder, and open from the closed state. One side of the communication path is the hot water reservoir, and the other side is through the communication path, lever chamber, and notch. passed sequentially with the connection port, the compressed air has been blown to the lever chamber or communicating passage Te Ejected to the outside sequentially through the tundish via a communication path, characterized by being adapted to discharge the burrs that has entered the gap between the pressure valve stem and the pressure bush to the outside.

Here, the pressure receiving valve refers to a valve that is disposed on the inlet side of the gas vent groove and in which the pressure receiving valve rod is reciprocally inserted in the pressure receiving bush, and includes a high-temperature fluid (including gas), particularly a molten metal, Any shape can be used as long as it operates with molten resin, has low sliding resistance, and allows air to pass through the gap between the pressure receiving bush and the pressure receiving valve rod when opened.
Here, the cylinder part of the pressure-receiving bush means a cylindrical part, and the hot water reservoir is opened wide toward the gas vent groove, and the molten metal flowing into the gas vent groove is stored to increase the melt pressure. The part which helps the pressure-receiving valve rod to be pressed in the closing direction.
Here, the valve portion of the pressure-receiving valve rod means a portion that is inserted into the cylinder portion of the pressure-receiving bush when closed, and protrudes at least to the sump of the pressure-receiving bush when opened, and the trunk portion has an elliptical or rectangular cross section. A non-circular shape that forms a communication path between the pressure-receiving bush and a flange that is larger in diameter than the body and that abuts the bottom surface of the communication path when it is opened, limiting the opening stroke. Say .
Here, the non-circular cross-section means that the cross-section of the body of the pressure-receiving valve rod is an ellipse or a rectangle, and the communication path is a non-circular cross-section of the valve stem body and the pressure-receiving bush. An air passage formed between and.

A third aspect of the present invention relates to the gas venting device including the pressure receiving valve according to the second aspect,
The compressed air sent to the connection port presses the closing valve rod of the closing valve in the opening direction, flows into the lever chamber from the notch portion of the closing bush, and presses the receiving valve rod of the pressure receiving valve in the opening direction. , So that it can flow from the communication passage into the communication path between the valve stem body and the bush cylinder, and can be ejected from around the open valve portion to flow out along the sliding direction of the pressure-receiving valve stem. Thus, the pressure-receiving valve rod can be stably maintained in an open state even when there is vibration such as mold clamping.

Here, the opening direction of the pressure-receiving valve rod means that the pressure-receiving valve rod of the pressure-receiving valve is pushed in the opening direction from the closed state by the air flowing into the lever chamber from the connection port , and the valve portion of the pressure-receiving valve rod is inserted into the pressure-receiving bush. It refers to sliding toward the gas vent groove from the late closed state .
The around where the valve unit refers to a periphery of the valve portion, and ejected to the outside, means that the ejecting air toward the bonding surface side of the fixed body in the open state to the outside, at this time, This refers to discharging burrs or the like that have entered the gap between the pressure receiving valve rod and the pressure receiving bush.
Here, the stable maintenance in the open state, until the mold clamping completion, by pressing the pressure receiving valve rod of the pressure receiving valve in the opening direction by the air, even if the vibration of the mold clamping, to maintain the pressure valve in the open state Say.

Since the degassing apparatus of the present invention is as described above, the following effects are achieved.
By providing the connection port to the air pressure supply circuit on the closing side of the closing valve, the closing valve rod in the closed state can be pressed in the opening direction by compressed air (hereinafter referred to as air). In addition, air flows into the lever chamber from the notch of the closed bush, pushes the pressure-receiving valve rod of the pressure- receiving valve in the closed state in the open direction, and degass along the communication path between the pressure-receiving valve rod and the pressure-receiving bush. Since it is discharged to the groove side , the pressure receiving valve can be kept open even if there is vibration in the product molding die or the gas venting device in the mold clamping process. That is, the pressure receiving valve can be kept open until the mold clamping is completed.
As a result, the operation reliability of the pressure receiving valve is significantly improved. That is, the usage period of the valve becomes longer, the frequency of repairs and replacements is reduced, and the cost is reduced.

Since the pressure receiving barba of the present invention has the above structure, the following effects can be obtained.
The pressure-receiving valve rod has a non-circular cross section of the body , and has a flange on one side of the body and a valve on the other side, and the pressure-receiving bush communicates with the lever chamber on one side. Is provided on the other side with a hot water reservoir that opens toward the gas vent groove, and is provided with a communication path that communicates with the communication path between the valve stem body and the pipe until it is in contact with the upper end of the pressure-receiving bush. Even if the pressure valve rod is slid in the opening direction, the communication path is in communication.
Moreover, when the pressure receiving barba is opened, the valve portion of the pressure receiving valve rod enters the hot water reservoir of the pressure receiving bush and is released from the closed state, and one side of the communication path communicates with the hot water reservoir and the other side communicates with the lever chamber via the communication passage. Therefore, air penetrates along the sliding direction of the pressure receiving valve rod. As a result, the pressure receiving valve can be cleaned with air every cycle.

Since the stable operation method of the pressure receiving valve in the gas venting apparatus of the present invention is as described above, the following effects can be obtained.
The air that flows into the lever chamber from the connection port via the closing valve presses the pressure receiving valve rod of the pressure receiving valve in the closed state in the opening direction, that is, passes along the sliding direction of the pressure receiving valve rod, and the state Is maintained until the completion of mold clamping, so that the pressure-receiving valve can be reliably maintained in an open state even if there is vibration in the product molding die or the gas venting device in the mold clamping process. As a result, the operation reliability of the pressure receiving valve is significantly improved.
In addition, since the air supplied to the pressure receiving valve is ejected outward from the entire circumference of the pressure receiving valve rod, burrs and the like that have entered the gap between the pressure receiving valve rod and the pressure receiving bush can be discharged to the outside. it can. As a result, the operability of the valve is significantly improved. That is, the molding cycle can be speeded up and the yield is improved.

It is sectional drawing which shows schematic structure of the degassing apparatus by this invention. It is sectional drawing which shows the arrangement | positioning relationship of a piston. It is sectional drawing which shows the operation example by the molten metal pressure of this invention pressure receiving valve. It is sectional drawing which shows the state at the time of the mold opening of the valve | bulb. It is sectional drawing which shows the operation state by the air pressure of the valve. It is sectional drawing of a cross-sectional surface (I) and a closing valve (B) of a pressure receiving valve. It is a cross-sectional view of a pressure receiving valve. They are a fixed-type joining side view (A) and a movable-type joining side view (B). It is sectional drawing of the stationary mold | type in the conventional gas venting apparatus.

First, the basic configuration of the gas venting apparatus will be described with reference to FIGS. 1-1, 1-2, and FIGS. 2 to 3. The fixed mold 1 to be attached to the fixed mold 31 of the product molding mold, and the product molding mold The movable mold 2 is attached to the movable mold 32, and a degassing groove 10 continuous to the cavity of the product molding mold is provided on the mold-matching side (parting line side) of the fixed mold 1 and the movable mold 2 and fixed. The mold 1 includes a fixed mold main body 1a having a block shape and a fixed mold lid 1b having a plate shape. The fixed mold main body 1a is opposite to a mold matching side ( hereinafter referred to as a lower side in accordance with the drawings). (Hereinafter, referred to as the upper side in accordance with the drawings) is provided with a lever chamber 19 that opens upward, and the opening side of the lever chamber 19 is closed by the fixed lid 1b , and on the inlet side with respect to the gas vent groove 10 7 the pressure receiving valve 3 as (b), placing the closure valve 6 on the outlet side, Bar chamber 19 includes an opening and closing lever 9 for transmitting the operation of the pressure receiving valve 3 in the closed valve 6 vertically swingably, and attached pipe 26 consecutive empty suction device (not shown) in the closed valve 6.
The movable mold 2 has a block shape and is provided with a gas vent groove 10 as shown in FIG.

Next, the form of the degassing apparatus according to the present invention will be described . The closing valve 6 incorporated in the degassing apparatus A is reciprocated within the cylindrical closing bush 8 and the closing bush 8 as shown in FIG. The closing bush 8 comprises a movable gas outlet 16 on one side and a notch 18 through which the lever 9 penetrates on the other side. The outlet 16 is a vacuum suction device. A pipe 26 to be connected is attached, and the closing valve stem 7 includes a valve body 7b on the lower side of the body 7a, a head 7c on the upper side, and a lateral groove 17 that engages with the lever 9 on the head 7c. A discharge passage 15 communicating with the discharge port 16 is formed between the closed bushing 8 and the closing bush 8, and the connection port 12 of the pressure feeding circuit is provided on the closing side of the closing valve rod 7. As shown in FIG. 4, the fixed lid 1b is provided with a connection port 12, and is referred to as compressed air (hereinafter referred to as air). The one in which to air toward the closed valve 6.
When the degassing device A is opened, the closing valve stem 7 slides to the open side (lower side in the drawing) as shown in FIG. 3, and the valve body 7b projects from the closing bush 8 to the degassing groove 10 side. The exhaust passage 15 can be ventilated and slides to the closed side when the gas venting device A is clamped , and the valve body 7b approaches the closing bush 8 but the gas vent groove 10, the exhaust port 16, and the exhaust passage 15 are connected. In order to communicate sequentially, the melt gas can be sucked from the gas vent groove 10 to the vacuum suction device.
The molten metal M reaches the closing valve 6, and the valve body 7 b of the closing valve rod 7 is pushed into the closing bush 8 by the molten metal pressure, whereby the closing valve 6 is completely closed and the passage of the molten metal M is blocked. That is, when the molten metal gas generated in the cavity or the like is sucked by the vacuum suction device after the product molding die is clamped, the passage of the molten metal M is prevented.

To describe the best mode of the pressure receiving valve according to the invention based on FIG 5 and (b), the pressure receiving valve 3 and the pressure receiving bush 5, the pressure valve stem 4 for inserting reciprocably in the pressure receiving bush within 5 It is comprised and used for the degassing apparatus A of this invention.
The pressure receiving bush 5 constituting the pressure receiving valve 3 is formed with a communication path 14 communicating with the lever chamber 19 on the upper side of the cylindrical portion 5a as shown in FIG. 3, and the gas vent groove 10 on the lower side of the cylindrical portion 5a. A hot water reservoir 5b that opens toward the end is provided.
The pressure-receiving valve rod 4 constituting the pressure-receiving valve 3 has a valve portion 4b on the lower side of the body portion 4a and a flange 4c having a diameter larger than that of the body portion 4a on the upper side . 1 is inserted into the pressure receiving bushing cylinder portion 5a so as to be in an initial closed state . Upon receiving the pressure of the molten metal M flowing into the gas vent groove 10, it is further inserted as shown in FIG. On the contrary, when the pressure receiving valve 3 is opened by mold opening, the valve portion 4b enters at least the pressure receiving bush hot water reservoir 5b as shown in FIG. 4 and is opened from the closed state, creating a gap with the hot water reservoir 5b, The clearance is sequentially communicated with the communication path 14 and the lever chamber 19 via the communication path 13, and can be vented in the vertical direction along the pressure receiving valve rod 4.
The flange 4c has a projection 4d that contacts the lever 9 at the center, and contacts the bottom surface of the communication passage 14 when the pressure receiving valve 3 is opened to limit the opening stroke. The trunk 4a has an elliptical cross section. It is formed in a rectangular non-circular shape , and a communication path 13 is formed between the pressure receiving bushing cylinder part 5a, and the pressure receiving valve 3 can be vented in the vertical direction when the valve part 4b is opened.
When the pressure receiving barba 3 is closed, the valve portion 4b of the pressure receiving valve rod 4 is inserted deeper into the pressure receiving bush cylindrical portion 5a than in the initial closed state, and is in the late closed state. Can be prevented.

When the pressure receiving valve 3 of the present invention is incorporated in the gas venting device A of the present invention and the product molding die to which the gas venting device A is attached is opened as shown in FIG. 3, the valve of the pressure receiving valve rod 4 constituting the pressure receiving valve 3. The portion 4b enters at least the hot water reservoir 5b from the cylindrical portion 5a of the pressure receiving bush 5 and is exposed to the outside from the mold matching side as shown in FIG. 4 and is opened from the closed state, and communicates with the lever chamber 19 and the communication passage 14. The path 13 and the hot water reservoir 5b communicate with each other sequentially.
As a result, the air sent from the connection port 12 to the closing valve 6 assists the opening operation of the closing valve rod 7, while flowing into the lever chamber 19 through the notch 18 of the closing bush 8 and from the lever chamber 19. The water is discharged from the hot water reservoir 5b through the communication passage 14 and the communication passage 13.
When the air is discharged from the hot water reservoir 5b to the outside via the communication path 13, it is discharged from around the valve portion 4b, so that burrs and the like attached to the gap h between the pressure receiving valve rod 4 and the pressure receiving bush 5 are blown off. As a result, the smooth operation of the pressure receiving valve 3 is enabled over a long period of time.
When the pressure receiving valve 3 is opened and the rod 4c of the pressure receiving valve rod 4 is slid until it contacts the bottom surface of the communication passage 14, the valve portion 4b of the pressure receiving valve rod 4 extends from the mold matching side to the outside as shown in FIG. It protrudes and is released from the closed state .
When the product molding die is clamped, the pressure-receiving valve rod 4 of the pressure-receiving valve 3 that has protruded to the outside is pushed back against the fixed mold 1, and the valve portion 4b is slightly inserted into the pressure-receiving bush 5 as shown in FIG. After the mold is clamped, the pressure of the molten metal M flowing into the gas vent groove 10 is received and pressed in the direction of the lever chamber 19 as shown in FIG. 2, so that the valve portion 4b is in the cylinder of the pressure-receiving bush 5 from the initial closed state. It is pushed into the portion 5a to be in the late closed state, and the intrusion of the molten metal M is blocked.

The lever 9 is longer than the arrangement interval between the pressure receiving valve 3 and the closing valve 6 and is positioned on the upper side (closing operation side) of the pressure receiving valve rod 4, and the base is pivoted by the bottom surface of the lever chamber 19 and the fixed lid 1 b. Holding as if supported, penetrating the notch 18 of the closing bush 8 at the tip, engaging the lateral groove 17 of the closing valve rod 7 at the tip, and swinging up and down around the base It becomes.
When the pressure receiving valve rod 4 of the pressure receiving valve 3 is pushed up by the molten metal pressure, the lever 9 slides upward with the base portion as a fulcrum (the closing direction of the closing valve rod 7 of the closing valve 6) by the pushing operation. .
On the contrary, when the closing valve rod 7 of the closing valve 6 is operated in the opening direction (downward), the lever 9 is slid downward along with the operation of the closing valve rod 7, and accordingly, the lever 9 is positioned below the lever 9. The pressure receiving valve rod 4 of the pressure receiving valve 3 is actuated in the opening direction (downward).

If the product mold is opened, the fixed mold 1 and the movable mold 2 of the gas venting apparatus A of the present invention attached to the mold are also opened.
When the gas venting device A is opened, the surplus member in which the molten metal M has solidified in the gas venting groove 10 is discharged to the outside together with the cast product from the gas venting groove 10 or gas is provided by an extrusion pin (not shown). It is protruded from the punching device A to the outside . Accordingly, the pressure receiving valve 3 and the closing valve 6 are returned from the closed state to the open state.

  When the gas sucked from the cavity by the vacuum suction device passes through the gas venting device A, it passes through the gas vent groove 10 without pushing out the pressure receiving valve rod 4 of the pressure receiving valve 3, and reaches the closing valve 6 in the open state. Then, it passes through the discharge path 15 which is a gap between the closing bush 8 and the closing valve rod 7, reaches the discharge port 16, and is absorbed by the vacuum suction device via the pipe 26 attached to the discharge port 16.

The air supplied to the connection port 12 presses the closing valve rod 7 of the closing valve 6 in the opening direction, and flows into the lever chamber 19 from the notch 18 of the closing bush 8, and the pressure receiving valve rod 4 of the pressure receiving valve 3. Is pressed in the opening direction to release the valve portion 4b of the pressure-receiving valve rod 4 from the closed state, and from the communication passage 14 through the communication path 13 to be ejected to the outside from around the valve portion 4b in the released state. The pressure receiving valve rod 4 is held in an open state until is completed. That is, air is ejected from the lever chamber 19 through the communication path 14 and the communication path 13 of the pressure receiving valve 3 to the outside from around the valve portion 4b in the open state.
As a result, even if the product molding die or the gas venting device vibrates by clamping, the pressure receiving valve 3 can be reliably held in an open state, so that the operation reliability can be improved. At this time, productivity is also improved by discharging the burr that has entered the gap h between the pressure receiving valve rod 4 and the pressure receiving bush 5 to the outside.

When the valve portion 4b of the pressure receiving valve rod 4 is exposed to the outside from the mold matching side as shown in FIG. 4, the projecting side end of the pressure receiving valve rod 4 comes into contact with the movable die 2 as shown in FIG. 1-1. It is pushed in the closing direction (upward) and enters the initial closed state when the mold clamping is completed.
When the molten metal M is filled into the cavity after completion of the mold clamping and the gas is sucked from the cavity, the gas first passes through the gas vent groove 10 of the gas venting device A, and then the molten metal M flows into the gas vent groove 10.
While the molten metal M flowing into the gas vent groove 10 reaches the hot water pool 6b of the pressure receiving bush 5 and the molten metal pressure is increased, the pressure receiving valve rod 4 is pushed in the closing direction, and the closed state is later than the initial closed state. By the sliding operation of the pressure-receiving valve rod 4, the lever 9 is pushed up with the base as a fulcrum, so that the lever 9 rotates clockwise, and the closing valve rod 7 slides in the closing direction, and the closing valve 6 is initially closed. Put it in a state. That is, the closing valve 6 is brought into the initial closed state by the lever 9.
If the product mold is opened after the melt M is solidified in the cavity and the gas vent groove 10, the fixed mold 1 and the movable mold 2 are also opened at the same time. Therefore, the surplus member solidified in the gas vent groove 10 is fixed. It is separated from the mold 1 and the movable mold 2 and discharged together with the product.

In addition, the form of this invention is not limited to an Example. For example, the base portion of the lever 9 can be pivotally supported by a pin, or the pivoting range of the lever 9 can be adjusted by interposing the pivotal support lid 29 between the lever 9 and the fixed lid 1b. Is possible.
The clearance h between the pressure-receiving bush 5 and the pressure-receiving valve rod 4 is 1/1000 to 6/1000 μ as an operable range, and 1/1000 to 3/1000 μ as an optimal range.
Further, in the embodiment, the gas vent groove 10 is formed in the movable mold 2. However, the gas vent groove 10 may be formed across the fixed mold 1 and the movable mold 2, or the gas vent groove 10 may be formed as shown in FIG. The delay path 11 may be formed on the way.
Even if the movable mold 2 is attached to the fixed mold 31 and the fixed mold 1 is attached to the movable mold 32, substantially the same purpose can be achieved, and as a surplus member discharge means, the surplus member discharge function part ( (Not shown) can be provided.

The pressure receiving barba 3 and the closing valve 6 may be circulated as a single unit, but are generally incorporated into the gas venting apparatus A and circulate.
A closing piston 21 that presses the lever 9 in the closing direction is provided on the opening swing side of the lever 9, and an opening piston 20 that presses the lever 9 in the opening direction is provided on the closing swing side of the lever 9. If the compressed air supply circuit is connected to the piston 20, it is possible to assist the swinging of the lever 9. In addition, either one of the closing piston 21 and the opening piston 20 can be a spring or can be omitted.

DESCRIPTION OF SYMBOLS 1 Fixed type, 1a Fixed type main body, 1b Fixed type lid body 2 Movable type 3 Pressure receiving valve, 13 Connection path 4 Pressure receiving valve rod, 4a Body part, 4b Valve part, 4c collar, 4d Projection part 5 Pressure receiving bush, 5a Tube part 5b Hot water reservoir, 14 communication path 6 Closing valve, 15 discharge path, 16 discharge port 7 Closing valve rod, 7a fuselage , 7b valve body , 7c head, 17 lateral groove 8 closing bush, 18 notch 9 lever, 19 lever Chamber, 29 Shaft support lid 10 Gas vent groove, 11 Delay path 12 Connection port
20 open piston
21 Closed piston 25 Fixing bolt 26 Pipe 31 Fixed mold 32 Movable mold A Degassing device M Molten metal h Clearance between pressure receiving bush and pressure receiving valve rod

Claims (3)

A pressure receiving valve (3) is arranged on the inlet side of the gas vent groove (10) provided in communication with the cavity of the product molding die, and a closing valve (6) is arranged on the outlet side, and at least the pressure receiving valve (3) is closed. with lever chamber (19) on a side, the lever chamber (19) to the gas release groove receiving valves (3) operating at impact load of the molten metal that has flowed into the (10) (M) of the motion closing the valve (6 ) to comprise a lever (9) for transmitting the pressure valve (3) pressure valve rod (4 reciprocating I along the pressure receiving bush (5) is), closing valve (6) is in the closed bushing (8) A closed valve rod (7) that reciprocates along, a notch (18) through which the tip of the lever (9) penetrates the closing bush (8), and a notch (18) in the closing valve rod (7). In the gas venting device having a lateral groove (17) fitted to the tip of the communication lever (9),
On the closing side of the closing valve (6), a compressed air connection port (12) for pressing the closing valve rod (7) in the opening direction is provided,
The pressure receiving valve rod (4) of the pressure receiving valve (3) includes a body (4a) having a non-circular cross section, and a communication path (13) between the body (4a) and the pressure receiving bush (5). Form the
When the mold is clamped, it receives the molten metal pressure flowing into the gas vent groove (10) from the initial closed state inserted into the pressure receiving bush (5), and enters the late closed state .
When the mold is opened, it slides toward the degassing groove (10) side from the late closed state, and one end thereof is opened from the closed state ,
One side of the communication path (13) communicates sequentially with the connection port (12) via the lever chamber (19) and the notch (18), and the other side opens toward the gas vent groove (10). Degassing device. In the pressure-receiving valve (3) used for the degassing apparatus according to claim 1,
The pressure receiving valve rod (4 ) of the pressure receiving valve (3) has a valve portion (4b) on one end side of the body portion (4a) and a rod (4c) for restricting the opening of the pressure receiving valve rod (4) on the other end side. The valve stem body (4a) has an oval or rectangular non-circular cross section, and forms a communication path (13) between the pressure receiving bush (5),
The pressure receiving bush (5 ) of the pressure receiving valve (3) is provided with a hot water sump (5b) that widens toward the degassing groove (10) on one end side of the cylindrical portion (5a), and a lever chamber on the other end side. A communication passage (14) communicating with (19) ,
The valve portion (4b) of the pressure receiving valve rod (4) receives the molten metal pressure flowing into the gas vent groove (10) from the initial closed state to be inserted into the pressure receiving bush (5), and enters the late closed state .
When the mold is opened, it slides toward the degassing groove (10) from the late closed state, enters at least the hot water reservoir (5b) from the bush cylinder (5a), and is opened from the closed state .
One side of the communication path (13) communicates sequentially with the hot water reservoir (5b), and the other side sequentially communicates with the connection port (12) via the communication path (14), the lever chamber (19), and the notch (18) .
The compressed air sent to the lever chamber (19) passes through the communication passage (14) through the communication passage (13) to the hot water sump (5b) and is ejected to the outside. The pressure receiving valve rod (4) and the pressure receiving bush A pressure receiving valve characterized in that burrs and the like that have entered the gap (h) in (5) can be discharged to the outside. In the degassing apparatus provided with the pressure receiving valve according to claim 2,
The compressed air sent to the connection port (12) presses the closing valve rod (7) of the closing valve (6) in the opening direction,
It flows into the lever chamber (19) from the notch (18) of the closing bush (8) , presses the pressure receiving valve rod (4) of the pressure receiving valve (3) in the opening direction ,
It flows into the communication path (13) between the valve stem body part (4a) and the bush cylinder part (5a) from the communication path (14), and is ejected to the outside from around the valve part (4b) in the open state .
By allowing the pressure-receiving valve rod (4) to flow out along the sliding direction, the pressure-receiving valve rod (4) can be stably maintained in the open state even when there is vibration such as clamping. A method for stably operating a pressure receiving valve in a degassing apparatus.

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