JPS6025218B2 - Die-casting machine mold clamping device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mold vertical method device for a die casting machine.

Generally, in a die-casting machine, molding is performed by injecting port water into a mold cavity formed on the mating surfaces of a fixed mold and a movable mold using an injection plunger. If gas remains, this gas will mix into the product, creating so-called cavities, resulting in deterioration of the quality of the molded product.

SUMMARY OF THE INVENTION An object of the present invention is to provide a mold device for a die-casting machine that is configured to be able to discharge gas in a mold cavity with an extremely simple structure and to prevent molten metal from spouting out.

In order to achieve the above object, in the present invention, in a die casting machine equipped with a die casting device that can change the mold clamping force, one die in the shape of a ring spring is used, and this die is connected to the other die. The mold mating surface of the mold is formed by a napper-shaped peripheral surface that comes into contact with each other even when the mold clamping force is weak, and a surface that continues to the outside of this peripheral surface and contacts each other only when the mold clamping force is strong. , a structure was adopted in which a gas exhaust path was provided between the cavity and both parts that continued to the outside of the peripheral surface.

The present invention will be described in detail below based on embodiments shown in the drawings.

1 and 2 are for explaining one embodiment of the present invention, and a vertical die-casting machine, which is indicated by the reference numeral 1 as a whole in the figures, has a fixed platen 2 at the lower end, and an upper part opposite to the fixed platen 2. It has a movable platen 3, a lower mold 4 is fixed to the fixed platen 2 side, and an upper mold 5 is fixed to the movable platen 3 side.

6 is a column, and this column 6 is continuous between the fixed platen 2 and the platen 7a which is integrated with the mold vertical cylinder 7, and also has the role of slidingly guiding the movable platen 3. Fulfilling.

13 is a mold opening cylinder provided between the movable platen 3 and the platen 7a.

The mold clamping cylinder 7 and the mold opening cylinder 13 are provided with an electromagnetic switching valve 1.
4. A hydraulic pump 16 is connected via a leaf valve 15 to regulate the strong longitudinal force of the mold.

Further, a relief valve 18 was connected to the drain port of the relief valve 15 via an electromagnetic switching valve 17 to regulate weak mold force. In this case, 1” leaf valve 15,1
8. The electromagnetic switching valve 17 and the like can be said to be devices that can change the mold longitudinal force during mold clamping. 8 is an injection plunger, and 8a is an injection sleeve. The injection sleeve 8a, in which the injection plunger 8 is slidably built in, is provided so as to be movable up and down a predetermined distance with respect to the fixed platen 2. It can rotate to the side of the device through the notch 2a formed on the side and the notch 9a formed on the side of the bolster 9 fixed on the stationary platen 2, and can receive the supply of molten metal. It is said to be composed of

By the way, the lower mold 4 is formed from two parts as shown in FIG.

That is, the lower mold 4 is composed of a ring spring part 10 and a base 11 fixed to the lower surface of the ring spring part 10. The ring spring portion 10 is formed, for example, in an annular shape, and has the property of expanding outward when a large force is applied from the inside. A tapered surface 10a is formed on the inner circumferential surface of the ring spring portion 10 on the upper mold 5 side, and a tapered surface 5a having the same forehead inclination angle as this seven-part surface 10a is also formed on the upper mold 5 side. ing.

The peripheral surfaces of the lower mold and the upper mold consisting of these tapered surfaces 10a and 5a are structured so that they can come into contact with each other even when the upper and lower molds 4 and 5 are held vertically with a weak force. Surface portion 10b continuous to peripheral surface portions 10a and 5a on the par
, 5b, there is a slight gap x between them. A gas exhaust path 12 is formed between the mold cavity and a portion of the upper end of the circumferential portion 10a that intersects with the circumferential surface 5a. In the state shown in FIG. 2, the gas exhaust path 12 is illustrated as one, but of course, a plurality of gas exhaust paths 12 may be provided radially. In this embodiment, if the relief valve 18 is activated by the action of the electromagnetic switching valve 17, the upper mold 5 will be lowered together with the movable platen 3 by the operation of the mold clamping cylinder 7, and the lower mold 4 will be attached to the weak vertically. In the state of contact with force, the surface portions 10b and 5 that become the mating surfaces of the molds 4 and 5
As mentioned above, there is a gap of x between b.

When injection by the injection plunger 8 is started in this state, the molten metal in the injection sleeve 8d begins to be supplied into the mold cavity, and the gas in the cavity passes through the gas discharge passage 12 at a distance of x. It passes through the gap and is discharged out of the mold. On the other hand, just before the mold cavity is almost filled with molten metal, this state is detected by detecting means such as detecting the stroke of the injection plunger 8 or a mitt switch, and the electromagnetic switching valve 17 is closed by the signal, thereby causing A set pressure by the relief valve 15 acts within the circuit.

That is, since a pressure change device is provided in the hydraulic circuit on the mold vertical cylinder 7 side, when the above-mentioned signal is received, this pressure change device is activated and mold clamping with a strong force is started. Then, the tapered surface 5a of the upper mold 5 is strongly pressed into the tapered surface 10a of the ring spring part 10, so that the ring spring part 10 spreads outward due to the wedge effect.

Then, the upper and lower molds 4 and 5 approach each other, the gap x mentioned above disappears, and the surface portions 10b and 5b are brought into complete contact. Therefore, the molten metal that has rushed inside the cavity will not spray out from the above-mentioned gap. In addition,
In the above embodiments, the gas exhaust passage 12 was shown as being provided so as to penetrate through the inside of the upper mold 5, but in this case, the gas exhaust passage 12 was provided along the tapered surface 5a as shown in FIG. Of course, it may also be provided.

Further, the present invention can be used not only in a vertical die-casting machine but also in a horizontal die-casting machine, and the ring-spring mold can be provided on the fixed platen side or on the movable platen side.

As is clear from the above description, the present invention is equipped with a mold clamping device that can change a weak mold clamping force into a strong mold total force when the mold total force is generated and before the cavity is completely filled with molten metal. , one mold is a ring spring-shaped mold, and the mold mating surfaces of one ring-shaped mold and the other mold are connected to the peripheral surface part on the taper that contacts each other even when the molding force is weak. , is formed by a surface that continues on the outside of this peripheral surface and contacts each other only when the mold clamping force is strong, and a gas exhaust path is provided between the cavity and the surface, so special gas discharge is prevented. It has the excellent effect of ensuring that a high-quality product without cavities is easily obtained by sufficiently discharging gas during injection without installing any equipment, and that it also completely prevents molten metal from spewing out. .

[Brief explanation of the drawing]

FIG. 1 is a front view of a vertical die-casting machine to which the present invention is applied, and FIG. 2 is a longitudinal sectional view illustrating one embodiment of the present invention.
FIG. 3 is a longitudinal sectional view illustrating another embodiment of the present invention. 1... Vertical die casting machine, 2...
Fixed plate, 3... Movable plate, 4... Fixed mold, 5... Movable mold, 5a, 10a...
・Peripheral part, 5b, 10b... Surface part, 7...
...Mold clamping cylinder, 8...Injection plunger, 8
a... Injection sleeve, 10... Ring spring, 12...
...Gas exhaust path.・ Figure 2, screen 3

Claims (1)

[Claims] 1.Equipped with a mold clamping device that can change a weak mold clamping force to a strong mold clamping force when the mold clamping force is generated and before the cavity is completely filled with molten metal, and one of the molds is equipped with a metal ring shaped like a ring spring. Using a mold, the mold mating surfaces of this ring-shaped mold and the other mold are formed into a tapered peripheral surface that contacts each other even when the mold clamping force is weak, and a tapered peripheral surface that continues on the outside of this peripheral surface to prevent mold clamping force. A mold clamping device for a die-casting machine using a mold formed by a surface portion that contacts each other only when the pressure is strong, and a gas discharge path is provided between the cavity and the surface portion that continues outside the peripheral surface portion. .