JPH0871724A - Gas venting device for metallic mold - Google Patents

Abstract

PURPOSE: To simplify the structure of a valve device and to manufacture the valve device at a low cost by fixing a valve cylinder to a parting surface of a fixed mold side and freely projectingly inserting a valve body so that the lower end surface does not immerse into the lower end opening of the valve cylinder. CONSTITUTION: The valve body 6b is formed almost same as an outer diameter as the inner diameter of the lower end opening of the valve cylinder 6a and flat and almost round disk shape at the lower end surface and projectably inserted so that the lower end surface of the valve body 6b does not immerse. Therefore, even when the whole valve mechanism 1 is not shifted upward, a solidified material invaded into a gas venting groove 5 and a bypass passage 5a can be removed. Further, a drawing mechanism for shifting the valve mechanism 6 upward is unnecessitate, and as a result, the valve device is simplified and the manufacturing cost can be reduced. Further, since the valve cylinder 6a of the valve mechanism 6 is fixed to the parting surface 3 of the fixed mold 1 side, the dislocation of the centers between the valve mechanism 6 and the gas venting groove 5 formed in the metallic mold 1 is not generated, and the clogging accident of the molten metal solidified material is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold degassing device for sucking air or gas in a cavity to close the cavity after the mold is closed in die casting, and more specifically, to a die degassing device. Form a gas vent groove on the split surface that leads to the cavity, and at the upper end of the mold split surface,
The present invention relates to a mold degassing device in which a valve mechanism is installed in which a molten metal that has risen from a cavity moves up a valve body so that the valve body is closed.

[0002]

2. Description of the Related Art As shown in FIG. 5, a conventional degassing device for a seed mold has a lower end surface b'of a valve body b of a valve mechanism a which is hollowed out in a reverse bowl shape. The molten metal that has risen in the gas vent groove c enters the lower end surface b ′ of the valve body b, and when the valve body b is pushed up, it solidifies as it is, and therefore when the cast product is taken out from the mold. Had to move the entire valve mechanism a upward by the driving cylinder e of the drawing mechanism d.

In addition, in this type of conventional mold degassing device, the locking groove g is formed in the valve rod f of the valve body b, and the locking ball i is elastically fitted in the locking groove g through the spring h. Since the valve body b of the valve mechanism a is held in the open state by mechanically engaging the valve mechanism b, the valve body b is held by wear of the locking groove g and the locking ball i, or the fatigue of the spring h. The force is likely to vary, and as a result, the valve body may be closed before the molten metal is filled in the cavity, or conversely, the molten metal may infiltrate into the valve mechanism.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and does not require a drawing mechanism for moving the valve mechanism upward. Therefore, the structure is simple and the cost is low. It is an object of the present invention to provide a mold degassing device that can be manufactured. Another object of the present invention is to provide a mold degassing device capable of reliably maintaining the valve open state or valve closed state of the valve body in the valve mechanism.

[0005]

[Means for Solving the Problems] To achieve the above object,
The mold degassing apparatus according to claim 1, wherein a degassing groove communicating with the cavity is formed on the split surface of the mold, and the degassing groove is raised from the cavity at the upper end of the split surface of the mold. In a mold degassing device in which a valve mechanism is installed in which the valve body is closed by the molten metal pushing up the valve body, a valve cylinder having the valve mechanism formed in a substantially cylindrical shape and a lower end opening of the valve cylinder. And a valve body that opens and closes the valve body, and the valve body is formed in a substantially disc shape having an outer diameter substantially the same as the inner diameter of the lower end opening of the valve cylinder and a flat lower end surface. It is characterized in that the valve body is fixedly attached to the divided surface, and the valve body is inserted and installed in the lower end opening of the valve cylinder so as to be able to project so that the lower end surface does not sink. Further, the mold degassing device according to claim 2 is characterized in that a plurality of ribs, which come into sliding contact with the inner peripheral surface of the lower end opening of the valve cylinder, are radially arranged on the upper surface of the valve body. It is a thing. Furthermore,
The mold degassing apparatus according to claim 3, wherein the valve mechanism comprises a valve cylinder formed into a substantially cylindrical shape and a valve body that opens and closes a lower end opening of the valve cylinder, and a valve guide is provided in the valve cylinder. The valve guide of the valve element is installed through the valve guide, and a piston is attached to the upper end of the valve rod protruding from the valve guide, and an air regulator is connected to the head side chamber of the piston. It is characterized in that the valve body is held in an open state via the piston by the pressure of air supplied from a regulator. Further, in the mold degassing device according to claim 4, a detection projection that projects upward from the upper end wall of the valve cylinder is integrally provided on the upper surface of the piston, and the detection projection is integrally formed on the upper surface of the upper end wall of the valve cylinder. The feature is that a sensor for monitoring the appearance of the detection protrusions is provided.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In the figure, 1 denotes a fixed mold, 2 denotes a movable mold, and these fixed mold 1 and movable mold 2 (hereinafter simply referred to as molds 1 and 2)
A cavity 4 is formed in the divided surface 3 of and the degassing groove 5 communicating with the cavity 4 is formed.

The degassing groove 5 has a bypass path 5a that branches off from the middle and detours, and is provided at the lower end opening 61a of the valve cylinder 6a of the valve mechanism 6 installed at the upper end of the dividing surface 3 of the molds 1 and 2. Gas and air that are communicated with each other and have come from the cavity 4 through the gas vent groove 5 are discharged to the outside of the molds 1 and 2 through the valve cylinder 6a of the valve mechanism 6.

The valve mechanism 6 is a valve cylinder 6 formed in a substantially cylindrical shape.
a, a valve body 6b for opening and closing the lower end opening 61a of the valve cylinder 6a,
A valve guide 6 that supports the valve rod 61b of the valve body 6b so as to be vertically movable.
c and a piston 6d which is installed in the valve cylinder 6a and moves up and down in the same body as the valve body 6b.

The valve cylinder 6a is divided into an upper member 62a formed in a bottomed cylindrical shape and a lower member 63a formed in a cylindrical shape, and the valve guide 6c is provided between the upper member 62a and the lower member 63a.
The upper member 62a, the lower member 63a, and the valve guide 6c are integrated with the flange 61c sandwiched therebetween.

The valve cylinder 6a is provided with mounting bosses 64a formed on both outer sides of the lower member 63a, and the upper ends of the split surfaces 3 of the molds 1 and 2, more specifically, the upper ends of the split surfaces on the fixed die 1 side. The lower end opening 61a is made to face the end of the gas vent groove 5 so as to be communicated therewith, and the exhaust hose 8 is connected to the exhaust port 66a of the valve chamber 65a.

On the other hand, the valve body 6b is formed in a substantially disk shape having an outer diameter substantially the same as the inner diameter of the lower end opening 61a of the valve cylinder 6a and a flat lower end surface 62b, and the valve rod 61b and the valve cylinder 6a are formed on the upper surface thereof. A plurality of ribs 63 that come into sliding contact with the inner peripheral surface of the lower end opening 61a of the
b is symmetrically arranged and projected around the valve rod 61b.
In the illustrated embodiment, the four ribs 63b are arranged in a substantially cross shape in a plane so as to protrude from the same body as the valve body 6b.

Then, the valve body 6b is inserted into the lower end opening 61a of the valve cylinder 6a in a projecting manner so that the lower end surface 62b thereof does not sink, and faces the end of the gas vent groove 5. That is, when the valve is open, the valve body 6b is the lower end opening 61a of the valve cylinder 6a.
Completely projecting from the gas vent groove 5 to close the upper end opening 5b of the gas vent groove 5 and the lower end opening 61a of the valve cylinder 6a communicates with the bypass passage 5a of the gas vent groove 5, and in the closed state, the lower end surface of the valve body 6b.
62b is installed so as to project slightly into the lower end opening 61a of the valve cylinder 6a without being completely immersed therein.

Further, the valve rod 61b of the valve body 6b is vertically movably supported by a valve guide 6c installed in the valve cylinder 6a.
The piston 6d is integrally attached to the tip of the valve rod 61b protruding from the valve guide 6c.

The piston 6d is installed in the upper member 62a of the valve cylinder 6a so as to be slidable up and down, and an air inlet is provided in a head side chamber 67a defined by the upper surface of the piston 6d and the upper member 62a of the valve cylinder 6a. 67a 'is formed, the air regulator 9 is connected to the air inlet 67a' of the head side chamber 67a, and the pressure of the air supplied from the air regulator 9 into the head side chamber 67a causes the valve body to pass through the piston 6d and the valve rod 61b. 6b is configured to be held in a valve open state.

An exhaust port 68a 'is formed in the rod side chamber 68a defined by the lower surface of the piston 6d and the valve guide 6c so as not to hinder the downward movement of the piston 6d, and the upper surface of the valve guide 6c is formed. Install o-ring 62c.

Further, the upper surface 61d of the piston 6d is integrally provided with a detection projection 61d protruding upward from the upper end wall 69a of the valve cylinder 6a, and the detection projection is formed on the upper surface of the upper end wall 69a of the valve cylinder 6a. The sensor 10 for monitoring the appearance of 61d is installed.

The operation of the die degassing device configured as described above will be described. After closing the molds 1 and 2, by supplying air of a predetermined pressure from the air regulator 9 into the head side chamber 67a, the piston 6d is pushed down by the pressure of the air as shown in FIG. Simultaneously with the contact with the upper surface of 6c, the valve body 6b is pushed down through the valve rod 61b connected to the piston 6d, and as a result, the valve body 6b projects from the lower end opening 61a of the valve cylinder 6a and is held in the open state. It In this valve open state, the upper end opening 5b of the gas vent groove 5 has the lower end surface 62 of the valve body 6b.
It is closed at b, and the lower end opening 61a of the valve cylinder 6a and the degassing groove 5 are communicated with each other by a bypass passage 5a.
The air is supplied from the air regulator 9 to the inside of the head side chamber 67a until just after the completion of the molten metal filling into the cavity 4.

In this state, when the molten metal is injected and filled in the cavity 4, the gas and air in the cavity 4 pass from the gas vent groove 5 through the bypass passage 5a, the lower end opening 61a of the valve cylinder 6a to the valve chamber 65a, and the exhaust port 66a. And is discharged through the exhaust hose 8. On the other hand, a part of the molten metal m rises in the degassing groove 5 and hits the lower end surface 62b of the valve body 6b.
As shown in FIG. 4, the head side chamber in which the valve body 6b is pushed down
The valve body 6b is pushed upward against the residual pressure of 67a.
Then, the valve body 6b is fitted and inserted into the lower end opening 61a of the valve cylinder 6a, the lower end opening 61a of the valve cylinder 6a is closed, the intrusion of the molten metal m into the valve cylinder 6b is prevented, and the valve closed state is Retained.

After the molten metal in the cavity 4 is cooled and solidified for a predetermined time, the molds 1 and 2 are opened, and the cast product in the cavity 4 is taken out (extruded). The solidified material that has entered and solidified in 5a is also removed from the dividing surfaces 3 of the molds 1 and 2. As a result, the valve body 6
b is opened so that it can freely move up and down, and the valve body 6b is pushed down again via the piston 6d and the valve rod 61b by the pressure of the air supplied into the head side chamber 67a of the valve cylinder 6a, thereby opening the valve. Becomes After that, the above operation is repeated.

[0020]

According to the present invention, in particular, according to the die degassing apparatus of claim 1, the outer diameter of the valve body is substantially the same as the inner diameter of the lower end opening of the valve cylinder, and the lower end surface is Since it was formed into a flat, substantially disk shape and was inserted so that its lower end face could not be immersed in the lower end opening of the valve cylinder, it was possible to use the gas mechanism without moving the entire valve mechanism upward like conventional devices. It is possible to remove the solidified material that has solidified by penetrating into the bleed groove or the bypass passage, thus eliminating the need for a drawing mechanism for moving the valve mechanism upward, resulting in simplification of the device and reduction of manufacturing cost. Not only can it be achieved, but the troubles associated with the extraction mechanism can be eliminated.

Moreover, since the valve cylinder of the valve mechanism is fixed to the divided surface on the fixed mold side, there is no fear of misalignment between the valve mechanism and the degassing groove formed in the mold, and as a result, burr blowing is performed. It is possible to reduce the clogging accident of the molten metal solidified product due to the burr or the burr.

According to the mold degassing apparatus of the second aspect of the present invention, since the plurality of ribs which come into sliding contact with the inner peripheral surface of the valve cylinder are radially formed on the upper surface of the valve body, the valve is formed. The valve body does not become unstable when the body is projected from the lower end opening of the valve cylinder to open the valve, and the valve body can be stably held even if the valve guide is small.

According to the third aspect of the present invention, the piston is attached to the upper end of the valve rod protruding from the valve guide, and the air regulator is connected to the head side chamber of the piston. Since the valve body is kept open by the pressure of the air supplied from the regulator, the variation in holding force in the open state is reduced, ensuring the open or closed state. Therefore, it is possible to reduce the number of accidents such as the occurrence of product defects and the intrusion of molten metal into the valve mechanism.

According to the die degassing apparatus of the present invention, the piston is integrally provided with the detection projection protruding upward from the upper end wall of the valve cylinder, and the upper end wall of the valve cylinder is projected. Since a sensor for monitoring the appearance of the above-mentioned detection protrusions is provided on the upper surface, the operation of the valve mechanism can be constantly monitored, and as a result, defective products due to failure of the gas venting device can be quickly and accurately detected. It becomes possible to do.

[Brief description of drawings]

FIG. 1 is a front view showing an example of implementing the present invention.

FIG. 2 is an enlarged sectional view taken along line (2)-(2) of FIG.

FIG. 3 is an enlarged cross-sectional view taken along the line (3)-(3) of FIG. 1, showing a valve open state.

FIG. 4 is a cross-sectional view showing a valve closed state in FIG.

FIG. 5 is a partially cutaway front view showing a conventional example.

[Explanation of symbols]

1: Mold (fixed mold) 2: Mold (movable mold) 3: Mold dividing surface 4: Cavity 5: Gas vent groove 6: Valve mechanism 6a: Valve cylinder 61a: Lower end opening 67a: Head side chamber 69a: Upper end Wall 6b: Valve body 61b: Valve rod 62b: Lower end surface 63b: Rib 6c: Valve guide 6d: Piston 61d: Detection protrusion 9: Air regulator 10: Sensor

Claims (4)

[Claims] 1. A gas release groove communicating with a cavity is formed on a mold dividing surface, and an upper end portion of the mold dividing surface is provided with:
In a mold degassing apparatus in which a valve mechanism is installed in which the molten metal that has risen from the cavity through the degassing groove pushes up the valve body to close the valve body, the valve mechanism is formed in a substantially cylindrical shape. And a valve body that opens and closes the lower end opening of the valve cylinder, and the valve body has a substantially disk shape with an outer diameter substantially the same as the inner diameter of the lower end opening of the valve cylinder and a flat lower end surface. And the valve cylinder is fixed to a split surface on the fixed mold side, and the valve body is inserted and installed so as to be freely projectable so that the lower end surface does not sink into the lower end opening of the valve cylinder. Degassing device for molds. 2. The degassing tool for a mold according to claim 1, wherein a plurality of ribs which are in sliding contact with the inner peripheral surface of the lower end opening of the valve cylinder are radially arranged on the upper surface of the valve body. apparatus. 3. A gas release groove communicating with a cavity is formed on a mold dividing surface, and an upper end portion of the mold dividing surface is provided with:
In a mold degassing apparatus in which a valve mechanism is installed in which the molten metal that has risen from the cavity through the degassing groove pushes up the valve body to close the valve body, the valve mechanism is formed in a substantially cylindrical shape. And a valve body that opens and closes the lower end opening of the valve cylinder, and a valve guide is installed in the valve cylinder.
While allowing the valve guide of the valve element to penetrate through the valve guide,
A piston is attached to the upper end of the valve rod protruding from the valve guide, an air regulator is connected to the head side chamber of the piston, and the valve body is opened via the piston by the pressure of air supplied from the air regulator. A mold degassing device characterized in that it is held in a valve state. 4. A sensor for integrally projecting a detection projection protruding upward from an upper end wall of the valve cylinder on an upper surface of the piston, and monitoring the appearance of the detection projection on the upper surface of the upper end wall of the valve cylinder. The mold degassing device according to claim 3, wherein the degassing device is installed.