JPS62114760A - Automatic molten metal supplying device for die-casting machine - Google Patents

Abstract

PURPOSE:To reduce a molten metal supplying time, to shorten a transporting distance and to prevent a temp. drop by constituting a combination of a pot dipped up the molten metal in a crucible with shifting up and down and a pouring bar submerged into the molten metal in the pot to adjust a shotting volume of the molten metal. CONSTITUTION:The pot 8 is lowered toward the crucible 5 to dip in the molten metal 6 by extension movement of a driving cylinder 11 for the pot, and after measuring the necessary time, which the molten metal is dipped up in the pot 8, by a timer, the pot 8 is elevated to a little upward molten metal surface by contraction movement of the cylinder 11. Then, the pot is stopped after elevation till an upper limit position by successive contraction movement of the cylinder 11. Next, the spout 25 is set just at pouring position for the molten metal by contraction movement of a driving cylinder for the spout, and the pouring bar 12 is lowered by extension movement of a driving cylinder 14 for the supplying bar, and consequently the bar 12 is submerged into the molten metal 6 in the pot 8. Then, the molten metal 6 in the pot 8 is overflowed from a pouring mouth 34 of the pot 8 and is poured to the sprue 7 through the spout 25.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an automatic water supply device for a die-casting machine that draws molten metal in a crucible and supplies it to a spout of the die-casting machine.

[Background of the invention]

As shown in FIG. 11, the automatic hot water supply device for this type of die casting machine has a small arm 3 rotatably pivoted to the tip of a large arm 2 whose base end is fixed to a reciprocating rotation shaft 1. It consisted of a ladle 4 attached to the tip.

Then, the molten metal 6 in the crucible 5 is scooped up by the ladle 4 at the position shown by the solid line in Figure 9, and then, as shown by the arrow, the small arm 3 is maintained in a substantially vertical state as the large arm 2 rotates, and the small arm 3 is held at two points. The ladle 4 was lifted to the position shown by the chain line, and then the trajectory of the ladle 4 became almost horizontal, and the ladle 4 was moved along the trajectory to the position shown by the broken line, and the molten metal 6 in the ladle 4 was poured into the pouring lower. .

By repeating the reciprocating movement of the ladle 4 between the crucible 5 and the pouring lower in this manner, the molten metal 6 in the crucible 5 was conveyed to the pouring lower of the die-casting machine.

However, in a die casting machine configured such that the large arm 2 rotates, the distance between the pouring lower and the crucible 5 is 1.4~
Because they are 1.7 m apart, when the amount of molten metal 6 supplied in the ladle 4 is particularly small, there is a drawback that the temperature of the molten metal 6 itself decreases and it takes too long to supply the hot water.

Further, since the amount of hot water supplied was adjusted by the inclination of the ladle 4, even a slight change in the inclination angle of the ladle 4 caused a significant change in the amount of molten metal 6 supplied, resulting in a disadvantage that the accuracy of hot water supply deteriorated.

[Purpose of the invention]

The present invention aims to eliminate such conventional drawbacks,
The objective is to create an automatic hot water supply system for a die-casting machine that can shorten the conveyance distance as much as possible, shorten the hot water supply time, prevent a drop in hot water temperature, and improve the accuracy of hot water supply. be.

[Summary of the invention]

In order to achieve the above-mentioned object, the present invention includes a pot that moves the molten metal in the crucible upward and downward to draw it up, and a pot in the bot. Equipped with a pouring bar that is immersed in the molten metal to adjust the discharge amount of the molten metal, said pouring bar is made of a polygon of triangular or larger size, and at least one side thereof is a concave surface extending in the vertical direction. It is characterized by

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a longitudinal sectional view showing an automatic hot water supply device for a die casting machine according to an embodiment of the present invention, FIG. 2 is a side view of essential parts of the automatic hot water supply device shown in FIG. 1, and FIG. An enlarged sectional view showing the relationship, Figure 4 is IV-I of the pouring gutter in Figure 3.
The V-line sectional view, FIGS. 5 and 6 are an enlarged side view and an enlarged sectional view of the hot water supply bar.

In FIG. 1, reference numeral 5 indicates a crucible, 6 indicates a molten metal, and 7 indicates a spout, which is the same as the conventional one.

8 is a pot for drawing up the molten metal 6 in the crucible 5, and this pot 8 is supported by a bracket 9, a block 10, and a cylinder 11 for driving the bot so that it can move up and down.

Reference numeral 12 denotes a pouring bar that moves up and down into the bot 8. This pouring bar 12 is supported by a pouring bar drive cylinder 14 attached to a mounting base 13 to adjust the amount of molten metal 6 to be discharged.

A rack 15 is fixed between the guide plates 16 and fixed to the end of the pouring bar 12.

17 is a pinion that meshes with the rack 15;
is connected to the potentiometer 9 by an axis I8.

20 is a support base for the shaft 18, 21 is a guide bar and block 1
0, and is slidably fitted into the guide 22.

23 is a base plate, and on this base plate 23 there are a pot driving cylinder 11, a mounting base 13, and a guide 22.
is fixed and mounted on the fixed platen 24 of the die-casting machine.

25 is a hot water tank, one end of which is rotatably supported by a shaft 26;
Connected to the pouring lower of the die casting machine.

27 is the cylinder for driving the hot water tank, 28.29 is the hot water pouring bar 1
2) An electric heater embedded in the hot water tank 25, 30 a hot water liquid detection sensor attached to the outer periphery of the pot 8, 31 a V-shaped groove in the hot water tank 25, and 32 and 33 a pot driving cylinder 1.
1. Brake mechanism for pouring bar drive cylinder 14, 34
is the spout of pot 8, 35 is ceramic fiber, 3
6 is a casing of the hot water tank 25, and 37 is a hot water level.

In such a structure, the molten metal 6 in the crucible 5 is transferred to the pot 8.
However, before that, the cylinder 27 for driving the hot water tank shown in FIG. 3 is extended to rotate the hot water tank 25 from the position shown by the solid line in FIG. 3 to the position shown by the two-dot chain line using the shaft 26 as a fulcrum.

This is because when the hot water tank 25 is at the position indicated by the solid line in FIG. 3, the spout 34 of the pot 8 and the hot water tank 25 are in a fixed relationship as shown in FIG. 1, so the two points in FIG. This is because when the pot 8 is rotated to the position indicated by the chain line, the connection between the spout 34 of the pot 8 and the hot water tank 25 is released.

When the hot water tank 25 rotates, the pot driving cylinder 11 shown in FIG. 1 expands in response to a start signal, and the bot 8 descends toward the crucible 5 from the position shown by the solid line to the position shown by the broken line in FIG. When the crucible 5 is immersed in the molten metal 6 and reaches a position where the molten metal 6 enters the pot 8 from the spout 34 of the bot 8, its movement is temporarily stopped by the molten metal sensor 30 shown in FIG.

Then, after measuring the time necessary until the molten metal 6 in the crucible 5 is pumped into the bot 8 by a timer (not shown), the bot 8 is moved slightly above the molten metal level 37 by the contraction of the bot driving cylinder 11. Rise and excess molten metal 6
is caused to overflow from the pot 8 into the crucible 5, and then by contraction of the pot driving cylinder 11, the first
It rises to the upper limit position shown by the solid line in the figure and stops.

After confirming the upper limit position of the bot 8, the hot water tank 25 is moved from the position shown by the two-dot chain line in FIG. 3 to the hot water receiving position shown by the solid line in FIG. 3 by contraction of the hot water tank driving cylinder 27. The hot water tank 25 is set, and the spout 34 of the bot 8 and the 7-shaped groove 31 of the hot water tank 25 are brought into communication.

Then, when it is confirmed that the hot water supply tank 25 is set in the fixed position and a signal to start pouring is issued from the die-casting machine, the pouring bar drive cylinder 14 is extended and the pouring bar 12 is moved. The descent begins, and the molten metal 6 in the pot 8
The pouring bar 12 is immersed therein.

In this way, the molten metal 6 in the pot 8 overflows from the spout 34 of the bot 8 by the volume that the pouring bar 12 is immersed in the molten metal 6 in the pot 8, passes through the hot water tank 25, and reaches the molten metal 6 in the pouring lower. The water is poured into the water.

Here, the descending distance of the pouring bar 12 is set at a preset position using a potentiometer 19 that is linked to the movement of the pouring bar 12.
, and the pouring bar 12 is stopped.

In this way, the bot 8 descends as the pot drive cylinder 11 expands, scoops up the molten metal 6 in the crucible 5, and rises as the bot drive cylinder II contracts.

On the other hand, the molten metal 6 in the bot 8 is transferred to the cylinder I4 for driving the pouring bar.
As the pouring bar 12 is extended, it is lowered and immersed in the pot 8, causing the molten metal 6 in the pot 8 to sequentially overflow from the spout 34.

When the overflow is completed, the pouring bar 12 is moved upward by the contraction of the pouring bar driving cylinder 14, and the pouring gutter 25 is returned to the standby position, and the bot 8 is again filled with molten metal by the extension of the pot driving cylinder 11. Repeat step 6 for pumping.

In this way, the bot 8 and the pouring bar 12 can supply the molten metal 6 to the pouring lower by simply repeating upward and downward movements, and the molten metal 6 can be supplied to the pouring lower.
By significantly shortening the transport distance, the hot water supply cycle can be shortened.

In addition, since the required amount of molten metal 6 in the pot 8 can be poured according to the descending distance of the pouring bar 12, a drop in the temperature of the hot water can be prevented and the accuracy of hot water supply can be improved.

The bot 8, the pouring bar 12, and the hot water tank 25 shown in FIG. Since the electric heater 29 is built in as shown in FIG. 4, it is possible to prevent the temperature of the molten metal 6 from decreasing during pouring.

In addition, is the cross-sectional shape of the hot water tank 25 V-shaped? By setting s31, even if the amount of molten metal 6 during pouring is small, the hot water tank 25
Since the contact area with the molten metal 6 in contact with the molten metal 6 becomes smaller, the molten metal 6
The molten metal 6 does not harden and the flow of the molten metal 6 is better than that of the conventional method.

Next, regarding the shape of the pouring bar 12, see Figures 5 to 10.
This will be explained using figures. As the shape of the pouring bar 12, the first
A cylindrical shape as shown in Fig. 0 can be considered. In this case, when the pouring bar 12 is inserted into the pot 8 to cause the molten metal 6 to overflow and then removed from the pot 8, the molten metal 6 adhering to the circumferential surface of the pouring bar 12 cools and solidifies, causing the molten metal 6 to overflow. A continuous coating 37 is formed on the surface. The thickness of this coating 37 gradually increases as the pouring bar 12 is repeatedly used.
Therefore, the amount of overflow of the molten metal 6 changes and the accuracy of hot water supply decreases.

Therefore, in one embodiment of the present invention, as shown in FIGS. 5 and 6, the pouring bar 12 has a star-shaped cross-sectional shape when viewed from above.
use. That is, in this example, there are six edges 38 extending in the vertical direction (axial direction) of the pouring bar 12,
The side surfaces between each edge 38 are concave surfaces 39 that are curved inward, and these concave surfaces 39 also extend in the vertical direction (axial direction) like the third edge.

7 and 8 are diagrams for explaining the principle of peeling off the coating 37 when this pouring bar 12 is used. Immediately after the molten metal 6 in the pot 8 is overflowed and the pouring bar 12 is pulled out from the pot 8, as shown in FIG. It remains in a shape.

When the molten metal 6 adhering to the pouring bar 12 is cooled by the surrounding air, the molten metal 6 adhering to the vicinity of each edge 38 of the pouring bar 12 is initially drawn toward the concave surface 39 due to its contraction force. The amount of molten metal near the edge 38 decreases.

As the cooling and solidification further progresses, a coating 37 is formed on the concave surface 39, but due to the contraction force of the coating 37, the coating 37 does not follow the concave surface 39 but is formed between the ridges 38, as shown in FIG. The film 37 becomes a straight line so that the distance is the shortest in the case of 2000, and the coating 37 is separated from the concave surface 39. Due to the mutual tensile force of the coatings 37 stretched in a straight line in this way, the coating 37 is
is torn, and the coating 37 is peeled off from the pouring bar 12.

FIG. 9 is a sectional view showing a modification of the pouring bar 12.

This example differs from the pouring bar 12 shown in FIG. 6 in that the bottom surface of the concave surface 39 is flat.

In the above embodiment, a hexagonal column pouring bar was explained.
The present invention is not limited to this, and any polygon that is triangular or larger may be used.

〔Effect of the invention〕

The present invention is constructed by a combination of a pot that moves the molten metal in the crucible upward and downward to draw it up, and a pouring bar that adjusts the amount of molten metal discharged by immersing it in the molten metal in the pot.
By shortening the transport distance of the molten metal, it is possible to shorten the hot water supply time and prevent a drop in the hot water temperature.Furthermore, since the shape of the pouring bar is as described above, cooling and solidification can be carried out from the circumference of the pouring bar. The coated film is easily peeled off, so it is possible to improve the accuracy of hot water supply.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an automatic water heater for a die casting machine according to an embodiment of the present invention, FIG. 2 is a side view of FIG. 1, FIG. 3 is an enlarged view showing the relationship between the pot and the water heater, and FIG. The figure is a cross-sectional view taken along the line IV-rl in FIG. An explanatory diagram showing the principle of peeling, FIG. 9 is an enlarged cross-sectional view showing a modified example of the pouring bar, FIG. 10 is a perspective view showing a comparative example of the pouring bar, and FIG.
FIG. 1 is a schematic diagram of a conventional automatic hot water supply device for a die casting machine. 5... Crucible, 6... Molten metal, 7...
...Pouring spout, 8...Pot, 12...
・Hot water pouring bar. Figure 3 Figure 4

Claims (2)

[Claims] (1) An automatic hot water supply device for a die casting machine that pumps up molten metal in a crucible and supplies it to a spout, which includes a pot that moves the molten metal in the crucible upward and downward to draw it up, and a pot that is immersed in the molten metal in this pot. A die casting machine comprising: a pouring bar for adjusting the amount of molten metal discharged, the pouring bar being made of a triangular or larger polygon, at least one side of which is a concave surface extending in the vertical direction. automatic water heater. (2) An automatic hot water supply device for a die casting machine, characterized in that the pot according to claim (1) and the pouring spout of the die casting machine are connected by a hot water supply gutter that moves approximately horizontally.