JPH0327861A - Automatic pouring device - Google Patents

Abstract

PURPOSE:To improve the quality of a cast product by providing a holding chamber and a filter for pouring to an injection sleeve of a die casting machine. CONSTITUTION:This device has valve seats 20a, 21a at the front end in the lower part of a furnace 2 and is provided with the sleeve of a lower opening type for supplying a molten metal into the injection sleeve 22. A pouring chamber 6 having the above-mentioned sleeve 22 is disposed forward and the holding chamber 5 backward in the furnace 2 and the filter 7 is provided between the two chambers. The impurities in the molten metal are filtered in this way, by which the quality of the cast product is improved. In addition, the pouring without moving the furnace is possible and the prevention of the temp. drop is thus possible. The workability is improved.

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to an automatic water supply device that supplies molten metal into the injection sleep of a die-casting machine. [Prior Art] Die casting machines are classified into vertical clamping dies and horizontal clamping dies according to the mold clamping direction, and also into vertical casting dies and horizontal casting dies according to the casting direction. This lachi-horizontal clamping vertical casting die-casting machine was proposed by Ganto Motoyama in 1983.
The method disclosed in Publication No. 55859 is known, and this is generally structured as follows. In other words, a movable platen is supported on the tie rods at the four corners that connect a pair of fixed plates facing each other on the machine base, so that the movable platen can move forward and backward with respect to one fixed platen. A movable mold and a fixed mold are respectively attached to one fixed plate. A cavity is formed at the joint between the movable mold and the fixed mold, which are moved together with the movable plate to be clamped by a mold clamping cylinder on the other fixed plate side, and the fixed mold communicates with the cavity. The fixed sleeve is fitted with a downward opening. An injection device is supported below the fixed mold so that it can be tilted upright, and this injection device includes an injection cylinder fixed to an injection frame,
It is equipped with a plunger that is connected to the piston rod and has a plunger tip at the tip that fits into the inner hole of the injection sleeve that can move up and down on the injection frame side. With this structure, after the mold is clamped, the entire injection device is tilted to supply molten metal into the injection sleeve by the hot water supply device, the injection device is stood upright, and the injection sleeve is joined to the fixed sleeve. When the plunger tip of the injection cylinder is raised, the molten metal passes through the fixed sleep and is injected into the cavity, so that the molten metal solidifies and a cast product is obtained. In addition, although this device exemplifies a system in which the entire injection device is tilted to supply hot water, other systems have also been developed in which the entire injection device is moved horizontally and hot water is supplied during the injection sleep mode. In addition, although this equipment is of the horizontal clamping and horizontal casting type, the structure of the injection device is almost the same for vertical clamping and vertical casting die casting machines. In such die casting machines, the hot water supply device that supplies molten metal to the injection sleeper has conventionally been equipped with a melting furnace that stores molten metal and a ladle that pumps out and drains the molten metal. The molten metal that has been melted in the melting furnace or in another melting furnace and then transferred to and stored in the melting furnace is
It is pumped out by the ladle and supplied into the injection sleep by the ladle moved above the injection sleep. Additionally, an automatic water heater has been developed that uses a motor to perform everything from pumping out the molten metal to moving the ladle and pouring the metal. However, in such conventional hot water supply devices, the molten metal is exposed to the atmosphere during hot water supply, so the surface of the molten metal is easily oxidized, which causes a problem in that the quality of the cast product deteriorates. Therefore, the present applicant proposed Japanese Patent Application Laid-Open No. 59-153563.
As disclosed in the publication, molten metal is poured into a sealed container-shaped ladle with an opening/closing rod in the center that opens and closes with a cylinder, and the ladle is moved horizontally and vertically by a motor to supply hot water. An automatic hot water supply system has been proposed. In addition, in a horizontal casting type injection sleeper, the injection sleeper and the closed molten metal container are connected by a hot water supply pipe surrounded by an electromagnetic coil, and the air pressure applied to the surface of the molten metal is controlled by the electromagnetic coil. It has been proposed that the molten metal is moved by the action of the molten metal to supply hot water.

[Problem to be solved by the invention] However, in the case of a device that supplies hot water using a closed ladle, the capacity of the molten metal cannot be increased due to its structure, and the pouring cycle is extended because it is troublesome to pump up the molten metal. There is a problem with doing this. Additionally, when the ladle is moved, the temperature of the molten metal decreases, which tends to impair the flow of the molten metal during pouring. In addition, in the case where the injection sleeper and the molten metal container are connected by a hot water supply pipe, if the molten metal is aluminum and moves inside the hot water supply pipe, the inside of the hot water supply pipe is easily corroded by the molten metal, resulting in a lack of durability. be. [Means for Solving the Problems] In order to solve these problems, the present invention provides a bottom-opening type sleeper that has a valve seat and an opening/closing rod inside and can supply molten metal into the injection sleeper. A structure in which a front hot water supply chamber having the sleep and a rear hot water heating chamber are provided inside the furnace, and a filter is provided between the hot water heating chamber and the hot water heating chamber to communicate these two chambers. I did it. [Operation] When the furnace is fixed in a horizontal position and molten metal is supplied from the inlet,
First, the molten metal is stored in an insulating room, and this molten metal moves from the insulating room to the hot water supply room through a filter, and is stored in the hot water heating room at the same level as in the insulating room, but when the molten metal passes through the filter, the molten metal is Impurities such as hard spots and oxides are filtered out. In this state, the injection sleeve moves horizontally from the mold side, then rises to a predetermined position in the automatic water heater and inserts the sleeve into its inner hole. Next, when the cylinder is actuated and the opening/closing rod is raised via the piston rod, the molten metal in the hot water supply chamber is supplied into the injection sleeper, and at the same time, by lowering the plunger tip, a predetermined amount of hot water is supplied. Next, the cylinder operates to lower the opening/closing rod and stop the hot water supply, completing the hot water supply. After that, move the injection sleeper to the specified position and perform the injection operation. Note that the furnace does not move during the above series of operations. [Example] Figures 1 to 4 show examples of the automatic hot water supply device according to the present invention, Figure 1 is a longitudinal sectional view of one example, and Figure 2 is a view of the vicinity of the valve stem and its insertion. Fig. 3 is an enlarged longitudinal sectional view showing another embodiment near the valve stem; Fig. 4 is a longitudinal sectional view of the injection sleeve;
The figure is a partially cutaway schematic side view of the entire unit shown to explain the operation. In the figure, a furnace 2 of an automatic hot water supply system Nl is formed as a C-shaped box as a whole, and a heater 3 is housed within its double-walled outer wall. Inside the furnace 2, a heating chamber 5 and a hot water supply chamber 6 are separated by a partition wall 4, and a filter 7 is provided in the center or lower part of the partition wall 4 to communicate the two chambers 5.6. Inside the greenhouse 5, there is a heater 3.
The heated molten metal 8 is stored in the hot water supply chamber 6, and the molten metal 8, from which hard spots and oxides have been removed by passing through the filter 7, is on the same surface as the insulating chamber 5. It is stored as The size of the mesh of the filter 7 is set so as to slow the passage of the molten metal 8, and since one injection shot usually takes 20 seconds or more, the amount of molten metal 8 passing through is set to, for example, 1 kg/720 seconds. 9 is a pouring spout opened at the upper end of the furnace 2. It should be noted that pipes for an inert gas such as N2 gas (not shown) are installed in the hot water heating chamber 5 and the hot water heating chamber 6 separately, or at least in the hot water heating chamber 6, so that the upper part of the molten metal 8 in the hot water heating chamber 5 and the hot water heating chamber 6 are connected to each other. It is also possible to create a structure in which the space is constantly replaced with air to create a N2 gas atmosphere to prevent the generation of oxides on the surface of the molten metal 8 as much as possible. The furnace 2 shaped in this way has a stand 1 as shown in FIG.
0 and an air cylinder 1l to allow for free tilting.
That is, bearings 12 are integrally formed at the rear end of the stand 10 on both left and right sides, which are the front side of the figure and the back side of the paper, and a shaft 13 is rotatably mounted on these left and right bearings 12. A pair of left and right support arms l4 are fixed to this shaft l3. The front end of the furnace 2 is connected to the support arm l.
The left and right ends of the furnace 2 are rotatably connected to the free end of the furnace 2 by pins 15, and the air cylinder is pivotally connected to the table 10 at the center of the lower end of the furnace 2 in the longitudinal and width directions. The working end of piston rod l6 of l1 is pivotally connected. By doing this, when the piston rod 16 of the air cylinder 1l is advanced in the upward direction from the position shown in the figure, the furnace 2 rotates around the pin 15 while keeping the support arm 14 stationary, as indicated by the chain line 2A in the figure. As shown, the front end is configured to tilt in the downward direction. Also, air cylinder 1l
When the piston rod l6 of
3, and the rear end is tilted in a downward direction, as shown by chain line 2B in the figure. Note that when the furnace 2 tilts from the solid line position to the chain line 2A position, the surface of the molten metal 8 becomes flush with the lower end of the filter 7, as shown by reference numeral 8A in the figure, and the furnace 2 tilts from the solid line position to the chain line 2B.
When tilted to the position, the surface of the molten metal 8 becomes flush with the lower end of the filter 7, as shown by reference numeral 8B in the figure, and no molten metal 8 remains in the hot water supply chamber 6. An air cylinder 17 is fixed to the upper surface of the front end of the furnace 2, and its piston rod 18 is suspended into the hot water supply chamber 6, and an opening/closing rod 19 made of, for example, ceramic is attached to the working end of the air cylinder 17. are connected concentrically. On the other hand, a closing ring 20 and a sleeper 2l are fitted into a hole drilled at the lower end of the hot water supply chamber 6, and the sleeper 21 has a valve that is opened and closed at its tip valve portion by advancing and retracting the opening/closing rod l9. A seat 21a is provided. Further, the closing ring 20 is provided with a valve seat 20a which is closed by the upper end valve portion in the event that the opening/closing rod 19 is broken. Reference numeral 22 denotes an injection sleeve on the side of the injection device which is movable horizontally and vertically. When the sleeve 2l moves downward and rises, the sleeve 2l is inserted into its inner hole, and the opening/closing rod 19 closes the valve seat. The molten metal 8 in the hot water supply chamber 6 is supplied into the injection sleeve 22 by opening 21a. A plunger tip 23 that moves forward and backward with an injection cylinder (not shown) is fitted into the inner hole of the injection sleeve 22, and when the plunger tip 23 rises while being joined to a fixed sleeve (not shown) on the mold side, the injection sleeve 22 moves forward and backward. The molten metal 8 in 22 is injected into the cavity of the mold. The elevating structure of the injection sleeve 22 and the plunger tip 23 is disclosed in Japanese Patent Application No. 1999 filed by the present applicant.
As disclosed in Japanese Patent Application No. 20053, it is preferable to use a pole screw from the viewpoints of smooth movement and shortening of the injection cycle. 24 is a detection rod consisting of a thermocouple that detects the temperature of the molten metal 8 in the sleep 21. The operation of the automatic hot water supply system constructed as described above will be explained. When the furnace 2 is placed in a horizontal position as shown by the solid line in FIG.
The hot water passes through the Noirta 7 and is stored in the hot water supply chamber 6 at the same level as in the insulating chamber 5. At this time, N2 gas is introduced into the insulating room 5 and hot water supply room 6 to replace the atmosphere with N2 gas.
A gas atmosphere may also be used. In this state, injection sleep 22
After moving horizontally from the mold side, it rises to the position shown in the figure and the sleep 2l is inserted into its inner hole. When the air cylinder l7 operates, the opening/closing rod l9 rises via the piston rod l8 and the valve seat 21a opens, so that the hot water supply chamber 6
Inner melting! 8 is fed into the injection sleeve 22. When a predetermined amount of hot water is supplied, the air cylinder 17 is operated, the opening/closing rod 19 is lowered, and the valve seat 21a is closed to stop the hot water supply, so that the injection sleeper 22 moves downward, moves horizontally, and then rises and is fixed. It is connected to the sleeve, and hot water 8 is injected. In such hot water supply, since the molten metal 8 is heated by the heater 3, it does not cool down and is kept warm, and since the filter 7 is provided, hard spots and oxides are filtered out. It does not mix with the molten metal 8 on the hot water supply chamber 6 side. Further, the amount of molten metal 8 corresponding to one injection shot and the amount of hot water supplied passes through the filter 7 and is passed through the hot water supply chamber 6.
will be replenished to. When the amount of molten metal in the furnace 2 decreases and the level of the molten metal falls below the upper end of the filter 7, air is introduced to the head end side of the air cylinder 11, the piston rod 16 rises, and the furnace 2 moves the support arm 14. Since it tilts to the state shown by chain line 2A around the stationary pin 15, by repeating this tilting and returning to the horizontal position while supplying hot water, the hot water level is kept warm as shown by the symbol 8A in Fig. 4. The molten metal 8 in the chamber 5 is
It can be taken out. In addition, if the opening/closing rod 19 should break or the opening/closing rod 1
If the valve seat 21a on the sleeper zl side that comes into contact with the tip of the opening/closing rod 9 is chipped, the air cylinder 17 will operate and the piston rod l8 will move down significantly, causing the valve part at the proximal end of the opening/closing rod l9 that remains to be broken off. closes the valve seat 20a, so the hot water supply is stopped and at the same time the air pump is closed. Air is supplied to the rod end side of the cylinder l1, and the piston rod 16 descends.
Since the furnace 2 tilts around the axis 13 to the state shown by the chain line 2B while swinging the support 7-m 14, the molten metal 8 in the hot water supply chamber 6 rises as indicated by the numeral 8A in FIG. It does not return to the hot water storage room 5 through the filter 7 and go to the hot water supply room 6. Therefore, the piston rod 18 and the air cylinder l7
This prevents the equipment from overheating and allows maintenance work to be started immediately. In this embodiment, the heat-retaining furnace 2 is used as an example of the furnace for storing the molten metal 8, but billets can be placed in the furnace and melted directly.
It is also possible to supply hot water directly from this melting furnace to the injection sleeper. [Effects of the Invention] As is clear from the above description, according to the present invention, in an automatic hot water supply system, hot water is directly supplied to the injection sleep from a furnace having an opening/closing rod inserted into the injection sleep at its tip. Moreover, since the inside of the furnace is separated between the hot water supply room and the insulating room through a filter, when the molten metal supplied to the insulating room passes through the filter, impurities such as hard spots and oxides contained in the molten metal are removed. is passed through, producing clean molten metal and improving the quality of cast products. In addition, since the molten metal can be supplied into the injection sleeper without moving the furnace, the temperature of the molten metal will not drop too much during supply, and air will not get mixed into the molten metal due to vibration, so during injection. The melt flows well, there are few cavities, and it is easy to obtain high-quality cast products. Additionally, by using a larger furnace, a large volume of molten metal can be placed in the insulated furnace, improving work efficiency. Furthermore, depending on the size of the cavity in both the fixed mold and the movable mold, the appropriate amount of molten metal can be supplied into the injection sleeper simply by operating the cylinder and raising the opening/closing rod, giving you greater flexibility. becomes larger, improving the workability of hot water supply work.

[Brief explanation of drawings]

Figures 1 to 4 show an embodiment of the automatic hot water supply device according to the present invention. Figure 1 is a vertical cross-sectional view of the first embodiment, and Figure 2 shows the vicinity of the valve stem and the injection sleeve into which it is inserted. A vertical cross-sectional view, FIG. 3 is an enlarged vertical cross-sectional view showing another embodiment near the valve stem, and FIG.
The figure is a partially cutaway schematic side view of the entire unit shown to explain the operation. l...Automatic hot water supply device, 2...
...Furnace, 3...Heater, 4...
... Bulkhead, 5 ... Warming room, 6 ...
...Water supply room, 7...Filter, 8...
...Molten metal, 17...Air cylinder. 18・
...Piston rod, l9... Opening/closing rod, 20... Closing ring, 21...
·sleep,

Claims (1)

[Claims] A bottom-opening sleeper with a valve seat and an opening/closing rod inside and capable of supplying molten metal into the injection sleeper is provided at the lower tip of the furnace, and a front hot water supply chamber with the sleeve inside the furnace and a rear water supply chamber are provided inside the furnace. 1. An automatic hot water supply system, comprising: a heat insulating room; and a filter is provided between the heat insulating room and the hot water supply room, allowing the two rooms to communicate with each other.