JPH0712533B2 - Deburring method of vacuum valve unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a vacuum die casting machine for communicating a cavity formed in a mold with a vacuum source and casting molten metal in the cavity under reduced pressure to cast a die cast product. The present invention relates to a method for removing burrs generated in a vacuum valve unit provided to prevent molten metal from flowing into a vacuum source from a cavity during injection.

[Prior Art] A conventional vacuum valve unit is usually attached to either one of both molds on a parting line of a fixed mold and a moving mold, and constitutes a part of the vacuum valve unit. The valve body is attached to both fixed and movable mold dividing surfaces and is slidably mounted in the valve hole communicating with the gas vent passage leading to the cavity.By moving the valve body, the vacuum source is opened and closed. Was there.

[Problems to be Solved by the Invention] In a vacuum die casting machine equipped with a vacuum valve unit, the molten metal that is splashed by the inertial force of the molten metal during casting of the product may enter the gap depending on the degree of the gap between the valve hole and the valve body. It may penetrate and remain as burrs. When the product is taken out after the mold is opened, the biscuit integrated with the cast product is taken out from the mold together with the cast product, but when the vacuum valve unit is attached to the fixed mold depending on the shape of the cast product, , The gap between the valve hole and the valve body provided on the same fixed mold on the parting, and the gap between the valve hole and the valve body provided on the same moving mold on the parting when attached to the moving mold. The generated burr is difficult to remove because the gap is small. In other words, burrs are not easily removed by air blow, etc., and they have to rely on human hands, making automation difficult, thus increasing the cost of the product.

The present invention eliminates such drawbacks and its purpose is to
The burr generated in the gap between the valve hole communicating with the gas vent passage leading to the cavity and the valve body slidably mounted in the valve hole is automatically removed without providing a burr removing structure. Another object of the present invention is to provide a method for removing burrs from a vacuum valve unit.

[Means for Solving the Problems] A method for removing burrs from a vacuum valve unit according to the present invention is
A valve hole engraved in the mold dividing surface above the gas vent passage that communicates with the cavity provided in the mold dividing surface, a valve body slidably mounted in the valve hole, and sliding on the mold dividing surface A sheet that has a hole that freely supports the valve element and that has a hole that connects the cavity and the gas vent passage to the vacuum source, and the valve element that is attached to the seat to move the valve element and use the cavity and the gas vent passage as the vacuum source. In a deburring method of a vacuum valve unit comprising a first cylinder communicating or closing and a second cylinder for moving the cylinder, a valve body and a seat, a second cylinder is used to raise the first cylinder, the valve body and the seat. After that, by moving the valve body up and down several times by the first cylinder, the burr generated in the gap between the valve hole and the valve body is shocked and pushed out to be dropped.

[Operation] By raising the first cylinder, the valve body, and the seat by the second cylinder, and then moving the valve body up and down several times by the first cylinder, a shock is generated in the burr generated in the gap between the valve hole and the valve body. It is given a pushing action and dropped.

[Examples] Hereinafter, the present invention will be described in detail with reference to the drawings illustrating examples. The figure shows a cross-section taken along the dividing surface between the fixed mold and the moving mold, and a cavity 12 is formed in the mold 11 (either the fixed mold or the moving mold), and the cavity 12 is a gas. It communicates with the extraction passage 13. A sheet 14 having a hole 14A at its center has a part (downward in the drawing) slidably inserted into the mold 11, and the open end (lower end surface in the drawing) of the hole 14A extends upward of the gas vent passage 13. Communicating with a valve hole 15A provided in contact with the portion, and the upper end of the hole 14A communicates with a vacuum source 17 through a hole 16 provided in the seat 14. The valve hole 15A is guided by the seat 14 and has its lower end attached to the seat 14.
A valve body 15 fixed to the tip of a piston 19 of a cylinder 18 is slidably inserted.

At the time of illustration, since the upper slope of the valve body 15 is in contact with the end face of the hole 14A of the seat 14, the communication between the cavity 12 communicating with the gas vent passage 13 and the vacuum source 17 is closed, but the A cylinder 18 is closed. When the pressure fluid is flown into the head side and the upper surface of the valve body 15 is projected downward from the valve hole 15A and lowered from the upper side to the lower side of the gas vent passage 13, the cavity 12 becomes the gas vent passage 13
Connected to the vacuum source 17 via. In the figure, a bracket 20 is fixed to the upper surface of the mold 11, and the lower end of the piston 22 of the B cylinder 21 mounted on the upper surface of the bracket 20 is the A cylinder.
It is stuck to 18. Since the lower end surface of the valve body 15 of the B cylinder 21 is flat and is in contact with a cast product (not shown), the valve body 15 becomes an obstacle when the mold is opened or the cast product is extruded. The valve body 15 is pulled up together, and the pressure fluid is introduced into the rod side of the B cylinder 21 to raise the A cylinder 18, the seat 14 and the valve body 15 so that the seat and the valve body are integrated with the biscuit. It is to be removed from the cast product.

Next, the operation of the above-described embodiment will be described.

In the illustrated state, when a pressure fluid is flown into the head side of the A cylinder 18 and the piston 19 is lowered, the upper surface of the valve body 15 has a valve hole 15
The cavity 12 protrudes from A and descends from the upper side to the lower side of the gas vent passage 13, and the cavity 12 communicates with the vacuum source 17 through the hole 16 from the gas vent passage 13, so that the cavity 12 is in a depressurized state. By supplying pressure fluid to the rod side of the A cylinder 18 when the cavity 12 reaches a predetermined vacuum pressure, the valve body
15 rises and is buried in the valve hole 15A, and the upper surface of the valve body 15 contacts the lower end surface of the seat 14 to return to the original position and the hole 14A
Close. Here, after the molten metal is filled in the cavity 12 from an injection mechanism (not shown), it waits for the molten metal to cool and solidify. When the molten metal solidifies to form a cast product, a pressure fluid is caused to flow into the rod side of the B cylinder 21 so that the A cylinder 1
8. The valve body 15 and the seat 14 are lifted to separate the valve body 15 and the like from the cast product (not shown). In this way, if the valve body 15 and the like are released from the cast product, it is possible to open the mold and extrude the cast product.

On the other hand, burrs (not shown) are generated in the gap between the valve hole 15A of the mold 11 and the outer peripheral surface of the valve body 15 during casting. When the cast product is extruded, the seat 14 and the valve body 15 are raised by the B cylinder 21. At this time, the burr rises together with the valve body 15 or adheres to the inner surface of the valve hole 15A and remains with the die 11, or There are also cases in between.

Here, in the present invention, when the A cylinder, the seat 14 and the valve body 15 are raised by the B cylinder 21, the valve body 15 is moved to the A position.
Cylinder 18 moves up and down several times. Due to this operation, in any of the above cases, the burr easily falls due to the shock and the pushing action of the valve body 15.

[Effects of the Invention] As described above, the method for removing burrs of a vacuum valve unit according to the present invention makes it possible to slide the valve body and the valve body freely when the seat and the valve body are in the raised position prior to extrusion of the cast product. The valve body was moved up and down several times to the burr generated in the gap between the valve hole and the valve hole, and the shock and the pushing action were given to the burr so that the burr was dropped. For this reason, deburring, which was difficult in the past, is automatically performed, and since the vertical mechanism of the valve body, which is an essential component of the vacuum valve unit, can be used, a special device is added for deburring. It has the advantage that it is not necessary.

[Brief description of drawings]

The drawing is a cross-sectional view showing an embodiment of the present invention. 11 …… Mold, 12 …… Cavity, 13 …… Gas vent passage,
15 ... Valve, 15A ... Valve hole.

Claims (1)

[Claims] 1. A valve hole formed in the mold dividing surface above a gas vent passage communicating with a cavity provided in the mold dividing surface,
A valve body slidably mounted in the valve hole, and a hole slidably mounted on the mold dividing surface to pivotally support the valve body and to communicate the cavity and the gas vent passage with a vacuum source. A seat, a first cylinder attached to the seat to move the valve body to communicate or close the cavity and the degassing passage with the vacuum source, and a second cylinder to move the cylinder, the valve body and the seat In the method for removing burrs of a vacuum valve unit, which comprises: (1) raising the first cylinder, the valve body and the seat by the second cylinder, and then moving the valve body up and down several times by the first cylinder, A deburring method of a vacuum valve unit, wherein a burr generated in a gap between a valve hole and the valve body is dropped by applying a shock and a pushing action.