JPH0335860A - Automatic molten metal supplying device - Google Patents

Abstract

PURPOSE:To automatically supply molten metal having high quality with high productivity by introducing the molten metal stored in a temp. holding chamber back side of a tiltable furnace into a molten metal supplying chamber of front side through a filter and injecting the molten metal from a sleeve through an opening/shutting rod. CONSTITUTION:In inside of the furnace 2, the temp. holding chamber 5 providing a heater 3 at the back side and the molten metal supplying chamber 6 providing a sleeve 21 at the front side are arranged and both chambers 5, 6 are communicated with the filter 7. The above sleeve 21 is made lower part opening type arranging a closing ring 20 having valve seat and the opening/shutting rod 19 is engaged with the valve seat to shut the sleeve 21. The molten metal 8 introduced from molten metal supplying hole 9, is stored in the temp. holding chamber 5 and further, introduced into the molten metal supplying chamber 6 through the filter 7. Successively, the opening/shutting rod 19 is ascended with an air cylinder 17 through a piston rod 18, and by opening the sleeve 21, the molten metal 8 is supplied into an injection sleeve. In the above automatic molten metal supplying device 11, one end part of the furnace 2 is fitted on a table with a hinge and the other end part is fitted to an action end of lifting means with a hinge to tilt the furnace 2. By this method, the molten metal 8 can be efficiently supplied and further, repair in the molten metal supplying chamber 6 is facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an automatic water supply device for supplying molten metal into an injection sleeve 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 classified into vertical casting dies and horizontal casting dies according to the casting direction. Among these, one example of a horizontal clamping vertical die casting machine was proposed by the present applicant and published in 1983.
A device disclosed in Japanese Patent No. 55859 and the like is known, and is roughly configured 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 set up opposite 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 of the fixed plates. A cavity is formed at the joint between the movable mold and the fixed mold, which are moved together with the movable plate and clamped by a mold clamping cylinder on the other fixed plate side, and the fixed mold has a fixed mold that communicates with the cavity. The 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,
A plunger is connected to the piston rod and has a plunger tip at the tip fitted into an inner hole of an injection sleeve that is movable up and down on the injection frame side.

With this configuration, after mold clamping.

When the entire injection device is tilted and the molten metal is supplied 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, and the plunger tip of the injection cylinder is raised, the molten metal flows into the fixed sleeve. The molten metal is then injected into the cavity, and the cast product is obtained by solidifying the molten metal. Note that although this device is exemplified as one in which the entire injection device is tilted to supply hot water, a device has also been developed in which the entire injection device is moved horizontally and then hot water is supplied to the injection sleeve. Also, the two machines are of the horizontal clamping and horizontal casting type.

The structure of the injection device is also the same for the vertical clamping vertical casting type die casting machine.

In such die casting machines, the hot water supply device that supplies molten metal to the injection sleeve has conventionally been equipped with a melting furnace that stores the molten metal and a ladle that pumps out and pours the molten metal. Molten metal that has been melted in another melting furnace or transferred to the melting furnace and stored is
It is pumped out by the ladle and fed into the injection sleeve by the ladle moved above the injection sleeve. In addition, an automatic water heater has also been developed that uses a motor to perform everything from pumping out molten metal to moving the ladle and pouring the molten metal.

However, in such conventional water heaters,
Since the molten metal is exposed to the atmosphere during the supply, the surface of the molten metal is easily oxidized, resulting in a problem that the quality of the cast product deteriorates.

Therefore, the present applicant proposed JP-A-59-1.5356.
As disclosed in Publication No. 3, molten metal is poured into a closed ladle with an opening/closing rod in the center that opens and closes with a cylinder, and this ladle is moved horizontally and vertically by a motor to supply hot water. An automatic hot water supply device has been proposed.

[Problems 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 casting cycle is extended because pumping up the molten metal is troublesome. There is a problem with doing so.

In order to solve this problem, we installed a front hot water supply room and a rear hot water storage room inside the furnace, installed a filter between the hot water storage room and the hot water supply room to communicate these two chambers, and installed a valve seat inside the hot water supply room. It is also possible to construct a furnace with a bottom-opening type sleeve having an opening/closing rod.

On the contrary, if the furnace is kept in a horizontal position and not moved, it has the disadvantage that if the die-casting machine is left out of operation for a long time, the hot water remaining in the insulating chamber cannot be pumped out.

[Means for Solving the Problems] In order to solve these problems, in the present invention, a front hot water supply chamber and a rear hot water storage chamber are provided inside the furnace.

A filter is provided between the insulating room and the hot water supply chamber to communicate the two chambers, and a bottom-opening type sleeve having a valve seat and an opening/closing rod inside is provided in the hot water supply chamber, and the outer periphery of the furnace is... The end is pivotally mounted on a table and placed in a freely tiltable position, and
The other end is pivotally connected to the working end of the elevating means.

[Action 1] When molten metal is stored in a melting furnace or a heat retention furnace and the opening/closing rod is inserted into the injection sleeve moved below the tip of the furnace and opened, the molten metal in the furnace is supplied into the injection sleeve, but the furnace When the amount of molten metal stored in the sleeve becomes low, the molten metal necessary for injection can be supplied into the injection sleeve by tilting the furnace by operating the elevating means in a direction in which the front end of the furnace descends.

Thereafter, the opening/closing rod is closed to stop the hot water supply, and then the injection sleeve is moved to complete the hot water supply. After that, the injection sleeve is moved to a predetermined position and injection is performed.

In addition, in the event that the opening/closing rod breaks, operating the lifting means in the direction in which the rear end of the furnace descends will cause the molten metal to return from the hot water supply chamber to the insulating chamber, preventing the molten metal from scattering from inside the injection sleeve to the outside. can also be easily prevented.

[Example] Figures 1 to 4 show examples of the automatic hot water supply device according to the present invention. Figure 1 is a vertical cross-sectional view of the embodiment, and Figure 2 shows 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 whole shown to explain the operation. In figure 0, the furnace 2 of the automatic water heater l is formed as a whole in the shape of a C rectangular box, and its outer wall has a double structure. A heater 3 is housed inside. Inside Furnace 2.

A partition wall 4 separates a heating chamber 5 from a hot water supply chamber 6, and a filter 7 is provided in the center or lower part of the partition wall 4 to communicate the compartments 5 and 6. The molten metal 8 heated by the heater 3 is stored in the insulating chamber 5, and the molten metal 8, which has been filtered by a filter 7 to remove hard spots and oxides, is also stored in the hot water supply chamber 6. The hot water is stored on the same level as chamber 5. The mesh size of the filter 7 is set so as to slow down the passage of the molten metal 8.

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 for 720 seconds.

Reference numeral 9 denotes a pouring spout opened at the upper end of the furnace 2. It should be noted that piping for an inert gas such as N2 gas (not shown) is 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. The space is replaced with air to create a constant N2 gas atmosphere.
It is also possible to adopt a configuration in which the generation of oxides on the surface of the molten metal 8 can be prevented as much as possible.

The furnace 2 thus formed is mounted on a stand l as shown in FIG.
It is tiltably supported by O and an air cylinder 11.

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 14 are fixed to this shaft 13. The front end of the furnace 2 is connected to the support arm 1.
The left and right ends of the air cylinder t are rotatably connected to the free ends of the furnace 4 with bins 15, and the air cylinder t, which is pivotally connected to the table lO side, is attached to the center of the lower end of the furnace 2 in the longitudinal direction and the width direction. The working end of the piston rod 16 is pivotally mounted. By doing this, when the piston rod 16 of the air cylinder ti is advanced in the upward direction from the position shown in the figure, the furnace 2 rotates around the bottle 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 a downward direction. In addition, the air cylinder 11
When the piston rod 16 of the furnace 2 is retracted in the downward direction from the illustrated position, the furnace 2 swings the support arm 14 while moving the shaft 1
3, and the rear end is configured to tilt in a downward direction, as shown by a chain line 2B in the figure. This series of raising and lowering of the rear end of the furnace 2 about the shaft 13 is performed by supplying compressed air to the piston head side or the piston rod side of the air cylinder ti, which is a lifting means.

However, when supplying the molten metal 8 to the injection sleeve 22.

In the unlikely event that the opening/closing rod 19 is broken or the valve seat 21a on the sleeve 21 side that comes into contact with the tip of the opening/closing rod 19 is chipped, the molten metal 8 may overflow from the injection sleeve 22, causing an alarm. A sequence is constructed in which compressed air is supplied to the piston rod side of the air cylinder 11 and extracted from the piston head side at the same time. The structure is such that the molten metal 8 is returned from the insulating chamber 5 to the insulating chamber 5 to prevent the molten metal 8 from overflowing from the injection sleeve 22. Note that when the furnace 2 is tilted 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 is tilted from the solid line position to the chain line 2B position. When tilted, 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 made of, for example, ceramic is attached to the working end of the air cylinder 17. 19 are concentrically connected. On the other hand, a blockage ring 20 is installed in the hole drilled at the lower end of the hot water supply chamber 6.
and a sleeve 21 are fitted, and the sleeve 21 is provided with a valve seat 21a that is opened and closed at its tip valve portion as the opening/closing rod 19 moves forward and backward. Further, the closing ring 20 is provided with a valve seat 20 & 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 injection device side that is movable horizontally and vertically. When the sleeve 21 moves downward and rises, the sleeve 21 is inserted into its inner hole, and the opening/closing rod 19 closes the valve seat. 2. The molten metal 8 in the hot water supply chamber 6 is supplied into the injection sleeve 22 by opening La. A plunger tip 23 is inserted into the inner hole of the injection sleeve 22 and is moved forward and backward by an injection cylinder (not shown).
When the plunger tip 23 rises while being connected to a fixed sleeve on the mold side (not shown), the molten metal 8 in the injection sleeve 22 is injected into the cavity of the mold. The elevating structure of the injection sleeve 22 and the plunger tip 23 is as disclosed in Japanese Patent Application No. 1-20053 filed by the present applicant.
It is preferable to use a pole screw from the viewpoint of smooth movement and shortening of the injection cycle. Reference numeral 24 denotes a detection rod consisting of a thermocouple that detects the temperature of the molten metal 8 within the sleeve 21.

The operation of the automatic water heater configured as 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 filter 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 heat preservation room 5 and the hot water supply room 6 to replace the atmosphere with N2 gas.
In this state, the injection sleeve 22 may be placed in a gas atmosphere.
After being moved horizontally from the mold side, it is raised to the position shown in the figure, and the sleeve 21 is inserted into the inner hole. When the air cylinder 17 operates, the opening/closing rod 19 rises via the piston rod 18 and the valve seat 21a opens, so that the hot water supply chamber 6
The molten metal 8 inside is supplied into the injection sleeve 22. When a predetermined amount of hot water is supplied, the air cylinder 17 is activated and the opening/closing row 2 is activated.
The door 19 is lowered, the valve seat 21a is closed, and hot water supply is stopped.

The injection sleeve 22 moves down, moves horizontally, and moves up to join the fixed sleeve, and the 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, and the hot water is heated. The molten metal 8 does not mix with the molten metal 8 on the chamber 6 side, and 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 replenished into the hot water supply chamber 6.

When the amount of molten metal in the furnace 2 decreases and the level of the molten metal becomes below the E end of the filter 7, air is introduced into the head end side of the air cylinder 11, and the piston rod 16 is raised to L2, causing the furnace 2 to rise.
While the supporting arm 14 remains stationary, it tilts around the bottle 15 to the state shown by the chain line 2A. By repeating this tilting and returning to the horizontal position while supplying hot water, the hot water level is reached at 8A in FIG. As shown, a large amount of the molten metal 8 in the insulating chamber 5 can be taken out.

In addition, if the opening/closing rod 19 breaks or the opening/closing rod 19 breaks,
If the valve seat 21a on the sleeve 21 side that comes into contact with the tip of the opening/closing rod 9 is chipped, the air cylinder 17 is activated and the piston rod 218 is lowered significantly, causing the remaining proximal end of the opening/closing rod 19 to break off. Since the valve portion closes the valve seat 20a, the hot water supply is stopped, and at the same time, air is supplied to the rod end side of the air cylinder 11 and the piston rod 16 is lowered.
Since the furnace 2 is tilted about the shaft 13 to the state shown by the chain line 2B while swinging the support arm 14, the molten metal 8 in the hot water supply chamber 6 becomes noil-tough, as shown by the molten metal level 8A in FIG. After that, the piston rod 18 and air cylinder 17
overheating is prevented and maintenance work can 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 sleeve.

[Effects of the Invention] As is clear from the above description, according to the present invention, an automatic hot water supply system is configured such that hot water is directly supplied to the injection sleeve from a furnace having an opening/closing rod inserted into the injection sleeve at its tip. As a result, the molten metal is not exposed to the atmosphere and oxidized, improving the quality of the cast product, and when feeding the molten metal into the injection sleeve like in conventional equipment.

Since there is no need to immerse the hot water supply ladle at the tip of the furnace and repeatedly pour the desired amount of molten metal into the ladle for each product, there is no need for a ladle conveying device with many moving parts, making maintenance easier. Less work and more productivity.

Further, according to the present invention, a large amount of molten metal can be stored in the insulating chamber in the furnace, and an appropriate amount of molten metal can be stored depending on the size of the cavity in both the fixed mold and the movable mold. You can feed into the injection sleeve simply by raising the cylinder, giving you a greater degree of freedom.

Improves the workability of hot water supply work.

Furthermore, in the event that it becomes necessary to stop the supply of molten metal to the injection sleeve, the molten metal can be easily returned from the hot water supply chamber to the insulating chamber by simply lowering the rear end of the furnace using the lifting means. Safety can be ensured.

Conversely, by simply raising the rear end of the furnace using the lifting means, l
Molten metal in an amount corresponding to the injection shot and the amount of hot water supplied passes through the filter and can be easily replenished into the hot water supply chamber, improving work efficiency.

Furthermore, since the inside of the furnace is separated between the hot water supply room and the insulating room via 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 filtered out. clean molten metal is obtained, improving the quality of cast products.

In addition, since the molten metal can be fed into the injection sleeve without moving the furnace, the temperature of the molten metal will not drop too much during feeding, and air will not get mixed into the molten metal due to vibration, so during injection. Good leakage flow, less occurrence of cavities, and it is easier to obtain high-quality cast products.Also, using a larger furnace, a large volume of molten metal can be placed in the insulating furnace, improving work efficiency. do.

[Brief explanation of drawings]

1 to 4 show an embodiment of an automatic water heater according to the present invention, and FIG. 1 is a longitudinal sectional view of the first embodiment. Fig. 2 is a vertical sectional view of the vicinity of the valve stem and the injection sleeve into which it has been inserted, Fig. 3 is an enlarged longitudinal sectional view showing another embodiment near the valve stem, and Fig. 4 is for explaining the operation. FIG. 1...Automatic hot water supply device, 2...Furnace, 3
... Heater, 4 ... Bulkhead,
5... Warming room, 6... Hot water supply room. 7... Filter, 8... Molten metal. 17... Air cylinder, 18... Piston rod, 19... Opening/closing rod, 20.
... Closure ring, 21 ... Sleeve, 20a, 21a ... Valve seat, 22 ... Injection sleeve.

Claims (1)

[Claims] A front hot water supply chamber and a rear hot water supply chamber are provided inside the furnace, a filter is provided between the hot water supply chamber and the hot water supply chamber to communicate these two chambers, and further, a valve seat and an opening/closing rod are provided inside the hot water supply chamber. A bottom-opening type sleeve is provided, one end of the outer periphery of the furnace is pivotally mounted on a table so as to be tiltable, and the other end is pivotally connected to the working end of the lifting means. Automatic hot water supply device.