JPS62279063A - Molten metal supply apparatus - Google Patents

Abstract

PURPOSE:To obtain a fixed quantity molten metal supply having good accuracy by arranging a plunger for molten metal supplying hole opening, which opens the molten metal supplying hole arranged to an injecting sleeve, and closing the molten metal supplying hole after supplying the molten metal at the fixed quantity. CONSTITUTION:At the time of supplying the molten metal, the injecting plunger 2 is placed at the working start position, and the plunger 8 for molten metal supplying hole opening is placed at the descent position to become the molten metal supplying hole 4 to the open state. Under this condition, by working of molten metal supplying pump 5, a fixed quantity molten metal A is pushed out into the injecting sleeve 1. Next, by ascending the plunger 8 for molten metal supplying hole opening, the molten metal supplying hole 4 is become to closed state, and after the injecting plunger 2 is progressed to forward to start to injection. Then, even if the pressure in the injecting sleeve 1 becomes to high, as the molten metal supplying hole 4 is closed by the plunger 8 for molten metal supplying hole opening, occurrence of an error for hydraulic supplying quantity is prevented by reverse flow, caused by the molten metal A pressure in the injecting sleeve 1.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Industrial Field of Application] The present invention relates to a water heating device for a cold chamber type die casting machine, and particularly to a water heating device that can improve the accuracy of hot water supply.

[Prior Art] Conventionally, a hot water supply device for a cold chamber type die casting machine has a configuration as shown in FIG. In the figure, 1 is an injection sleeve, and 2 is an injection plunger driven by an actuator (not shown). Further, 3 is a hot water supply pipe that communicates with a hot water supply port 4 provided in the injection sleeve 1;
1 is a hot water supply pump consisting of an electromagnetic pump as a molten metal pumping device connected to a molten metal insulating furnace (not shown).

After a fixed amount of molten metal A is pumped into the injection sleeve by the hot water pump 5, the hot water pump 5 is stopped and at the same time the injection plunger 2 is moved in the direction of arrow a to push out the molten metal A inside the injection sleeve 1. At this time, a fixed amount of molten metal A is supplied into a cavity (not shown) by closing the hot water supply port 4 with the injection plunger 2.

[Problems to be Solved by the Invention] However, in such a conventional device, there is a time delay for the large-diameter injection plunger 2 to start and fully close the hot water supply port 4, and the injection plunger There is a serious problem in that the molten metal A flows backwards from the hot water supply port 4 due to the dynamic pressure of the molten metal caused by the start of step 2, causing an error in the amount of hot water supplied.

Therefore, in order to correct this hot water supply amount error, conventionally, an appropriate value has been set through trial and error, such as holding the pressure when the hot water pump 5 is stopped and adjusting the time delay using a timer.
There is a problem that the adjustment work is extremely troublesome.

The present invention has been made based on the above circumstances, and provides a water heater that can reliably prevent errors in the amount of hot water supplied due to backflow of molten metal from the hot water supply opening, can supply hot water with high precision, and does not require extremely troublesome adjustment work. The purpose is to provide.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides a plunger for opening and closing the hot water supply port provided in the injection sleeve for opening and closing the hot water supply port,
A backflow prevention means is provided for moving the plunger in one direction to open the hot water supply port during hot water supply, and after supplying a fixed amount of hot water, moving the plunger in the other direction to close the hot water supply port to prevent backflow of hot water. It is.

[Operations] In other words, in the present invention, with the above configuration, after a fixed amount of molten metal is injected into the injection sleeve, the injection plunger is started after closing the molten metal inlet by the molten metal opening/closing plunger. There is no backflow even if pressure is applied to the This enables highly accurate quantitative hot water supply.

[Example] The present invention will be described below based on the example shown in FIGS. 1 and 2.

In the figure, 1 is an injection sleeve connected to a mold cavity (not shown), and an injection plunger 2 that can freely reciprocate in the direction of arrow a is fitted into the injection sleeve 1 by an actuator (not shown). ing. Further, a cylinder block 7 having a hot water supply passage 6 whose opening at one end serves as a hot water supply port 4 is attached to the injection sleeve 1, and a hot water supply pipe 3 is connected to this cylinder block 7. ing.

Further, a plunger 8 for opening and closing the hot water supply port is fitted into the cylinder block 7 and is capable of reciprocating in the direction indicated by the arrow by an actuator (not shown). 4 is opened, and after a fixed amount of hot water is supplied, the plunger 8 is moved forward to close the hot water supply port 4 to prevent backflow of the molten metal A. In addition, 5 in the figure is a hot water supply pump consisting of an electromagnetic pump as a molten metal pumping device connected to a molten metal insulating furnace (not shown).

When hot water is supplied, first, as shown in FIG. 1, the injection plunger 2 is at the starting position, and the hot water supply opening/closing plunger 8 is at the lowered position, opening the hot water supply opening 4. In this state, the hot water pump 5
operates, and a fixed amount of molten metal A is pumped into the injection sleeve 1.

Next, as shown in FIG.
rises to close the hot water supply port 4, after which the injection plunger 2 moves forward (to the left) and starts injection.

At this time, even if the pressure inside the injection sleeve 1 becomes high, the hot water supply port 4 is closed by the hot water supply port opening/closing plunger 8. Errors in the amount of hot water supplied do not occur due to stoppage of the pump 5, delay in closing the hot water supply port 4, and backflow due to the pressure of the molten metal A in the injection sleeve 1 caused by the injection plunger 2. , Further, there is no need for troublesome adjustment work to correct errors.

Note that the present invention can be modified in various ways without departing from the gist of the present invention.

For example, as shown in Figure 3, when changing the amount of hot water supplied by making the injection start position of the injection plunger 2 variable, there is no need to create a new injection sleeve, hot water supply port, or hot water pipe specifically for the mold. It may be possible to reduce costs by using common parts and to easily adjust the required amount of hot water supply to improve operability.

Conventionally, when the mold changes, the volume of the cavity changes, so (
A new member was manufactured specifically for the mold using the equation (inner diameter of the injection sleeve) x (injection stroke). In the case shown in Fig. 3, when the volume of the die-cast product increases,
By increasing the amount of hot water supplied, changing the starting position of the injection plunger 2 from Sl to Sl, and increasing the stroke by X, there is no need to change other members. This means that even if the mold is changed, the members can be used in common.

In the description of this other embodiment (FIG. 3), the same parts as those of the above-mentioned embodiment will be given the same reference numerals and detailed explanation will be omitted.

[Effects of the Invention] As explained above, according to the present invention, since the hot water supply port is closed by the plunger, there is no backflow of molten metal, and the accuracy of hot water supply can be improved.

Furthermore, since the molten metal inside the hot water supply pipe does not flow back, the pipe is always filled with molten metal and there is no air contact, which prevents oxidation of the molten metal and allows hot water to be supplied in a completely sealed state.

Furthermore, it is also possible to simultaneously solve the problem of the conventional method, such as the hot water inlet being blocked due to oxidation and coagulation caused by residual hot water at the hot water inlet.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the present invention,
Fig. 1 is a schematic sectional view, Fig. 2 is a sectional view of the main part showing the closed state of the hot water supply port, Fig. 3 is a sectional view of another embodiment of the present invention, and Fig. 4 is a conventional example. It is a schematic cross-sectional view. 1... Injection sleeve, 2... Injection plunger, 4...
...Hot water supply port, 8...Plunger for opening and closing the hot water supply port, 10.
・Backflow prevention means.

Claims (2)

[Claims] (1) In a hot water supply device for a cold chamber type die-casting machine, a hot water supply port opening/closing plunger is provided on the injection sleeve to open and close the hot water supply port, and during hot water supply, the plunger is moved in one direction to open the hot water supply port and supply a fixed amount of hot water. A hot water supply device characterized in that a backflow prevention means is provided for preventing backflow of hot water by moving the plunger in the other direction to close the hot water supply port. (2) The water heater according to claim 1, wherein the injection start position of the injection plunger is made variable, and by changing the injection start position of the injection plunger, the amount of molten metal supplied is made variable.