JPH0338022B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a molten metal supply device, and more specifically, in a die casting machine or the like, an induction heating device is attached to a sleeve for supplying molten material to a die, and the raw material for forming a product is fed into the sleeve. The present invention relates to a melt supply device configured to melt at a temperature.

Die-casting machines have become widely used as devices that produce high-precision, high-quality castings in large quantities in a short time by heating molten alloy to a high temperature and press-fitting it into precisely configured molds under high pressure and high speed. It is used in

In conventional die-casting machines, a furnace is installed adjacent to the machine body in order to supply molten metal to the machine, and the molten metal is stored in the furnace in advance, and the machine is heated through a ladle etc. during casting. A predetermined amount of molten metal was supplied to the injection sleeve. Therefore, in order to operate a die-casting machine, a melting furnace is required to melt raw materials such as aluminum alloy and zinc alloy in advance, and a furnace is used to store the melted hot water near the machine body as described above. It has the disadvantage that it has to be installed and occupies a relatively large space. In addition, the high temperature molten metal must be transported from the melting furnace to the above-mentioned storage furnace, which is always dangerous, and this has the disadvantage of deteriorating the working environment. Furthermore, when the molten metal is transported as described above, the molten metal shakes and comes into contact with oxygen in the air and is oxidized, which may reduce the quality of the molded product. On the other hand, a furnace for storing molten metal or a melting furnace must always have more molten metal than the number of molded products. Therefore, it has been pointed out that there are inconveniences such as not only is an excessive molten metal heat insulating device required for this purpose, but also the surplus molten metal generated when molding is completed must be taken out from the furnace and disposed of.

Therefore, as a result of repeated research and ingenuity, the present inventor focused on a sleeve that is used when a press-fitting plunger rod descends to push molten metal into a die in a die-casting machine. If a heating device is attached, the molten metal supply device can easily melt the pellet-like molten metal material into the sleeve and energize the induction heating device, leading it immediately to the molding process. As a result, it was found that the above-mentioned disadvantages were eliminated.

Therefore, an object of the present invention is to provide a molten metal supply device that has a simple structure, is free from danger, is suitable for miniaturization, and is capable of obtaining a desired amount of molten metal, as well as a molded product of high quality. It is on offer.

In order to achieve the above object, in the present invention, a sleeve made of a highly permeable insulator is disposed inside the furnace main body, an oblique hole for introducing the molten material is connected above the sleeve, and the sleeve is connected to the sleeve for introducing the molten material. An induction coil constituting an induction heating device is wound and mounted on the lower side of the oblique hole in the sleeve, the bottom of the sleeve is directly connected to the die, and a single press-fit cylinder is disposed above the sleeve, It is characterized in that the molten metal melted within the sleeve under the action of induction heating under the biasing action of the press-fitting cylinder is fed to the die.

Next, the molten metal supply device according to the present invention will be described in detail below with reference to the accompanying drawings, citing preferred embodiments in relation to a die-casting machine incorporating the device.

As is well known, die casting machines can be divided into hot chamber type and cold chamber type, and FIG. 1 shows this hot chamber type die casting machine. The die casting machine, designated by reference numeral 10, is divided into a fixed furnace section 12 and a movable section 14. The movable part 14 is connected to the base 1
A pair of rail members 18 are laid on the rail member 18, and a movable die plate 20 and an end frame 22 are arranged on this rail member 18, while a fixed die plate 24 is fixedly installed in the vicinity of the furnace section 12. It becomes. In this case, the movable die plate 20 can slide on tie bars 25, 25 disposed above and below, and a mold clamping cylinder 26 is disposed on the end frame 22. Toggle links 28, 28 are provided at the upper and lower ends of the end frame 22 and the movable die plate 20, respectively, to bridge the two. The crankshafts 30, 30 of the toggle links 28, 28 are connected via pin members 36, 36 to a crosshead 34 which fits into a cylinder rod 32 extending from the clamping cylinder 26. A movable die 40 is mounted using the movable die plate 20, while a fixed die 42 provided opposite to the movable die 40 is fixed to the fixed die plate 24. As can be understood from the figure, the fixed die plate 24 has a hole 44 formed substantially in the center thereof, and is arranged so that the nozzle 46 extending from the furnace section 12 faces the hole 44.

Next, the internal structure of the furnace section 12 will be explained with reference to FIG. The furnace section 12 includes a rectangular or cylindrical main body 50 in which heat-resistant blocks 48 are laminated, a cylindrical hole extending vertically in the substantially central part thereof is defined, and a ceramic, quartz, etc. A sleeve 52 made of a magnetically permeable material is fitted. A diagonal hole 54 is formed in the wall of the sleeve 52, and is used as an introduction hole for pellets 56 as a casting material. As can be understood from FIG. 2, an induction coil 60 constituting an induction heating device 58 is wound around the wall of the sleeve 52 within the casing 57, and a molten metal lead-out passage 62 extends from the bottom of the sleeve 52.
The nozzle 46 is communicated through.

In the figure, reference numeral 64 indicates a press-fit cylinder, and reference numeral 66 indicates a press-fit plunger rod that feeds the molten metal in the sleeve 52 to the dies 40, 42 under a predetermined pressure by the press-fit cylinder 64. , and reference numeral 68 is a piston attached to the tip of the rod 66.

The molten metal supply device according to the present invention is basically configured as described above, and its operation and effects will be explained next.

First, a predetermined amount of melting pellets 56 made of a metal conductor are introduced into the sleeve 52 through the oblique hole 54, and the induction heating device 58 is energized. As a result, the induction coil 60 of the induction heating device 58 generates predetermined lines of magnetic force due to the current flowing therein. Therefore, since these lines of magnetic force easily reach the inside of the sleeve 52 made of a highly permeable material and generate an alternating magnetic field, an induced current flows in the pellet 56 within the sleeve 52 due to electromagnetic induction.
This causes the pellets to be heated. As a result, the pellets 56 are relatively easy to heat.
gradually melts and is stored in the sleeve 52 and moves toward the nozzle 46. At this time, the heat-resistant block constituting the furnace body 50 serves to maintain the molten metal material at a high temperature.

On the other hand, in the movable portion 14, the mold clamping cylinder 26 is energized, and its cylinder rod 32 performs forward movement. As a result, the toggle link 28 is actuated through the crosshead 34, causing the movable die plate 20 to slide on the tie bar 25, and the movable die 40 to firmly engage the fixed die 42.

Therefore, if the press-fit cylinder 64 is energized and the press-fit plunger rod 66 is lowered, the piston 68
As a result, the metal material molten within the sleeve 52 reaches the nozzle 46 via the molten metal lead-out passage 62, and from this nozzle 46 it reaches a predetermined-shaped space defined by the fixed die 42 and the movable die 40.
Therefore, after a certain period of time, the dice 40, 42
Since the metal material inside has solidified, by reenergizing the mold clamping cylinder and moving it back, a molded product of a predetermined shape can be obtained from the dies 40, 42.

In this way, molded products are successively obtained, but if the molten material in the sleeve 52 becomes insufficient, the required amount of pellets 56 can be replenished through the oblique hole 54.

According to the present invention, as described above, since a melting furnace, a furnace for storing molten metal, a ladle, etc. are not required, the die casting machine as a whole becomes extremely compact, and there is no need to transport high-temperature molten metal. Since it is no longer present, there is no danger and the working environment is improved. Furthermore, by supplying the required amount of metal material, the corresponding number of molded products can be obtained, eliminating waste, and preventing the molten metal from oxidizing during transportation, resulting in high-quality molded products. It has remarkable effects such as being able to obtain the following.

Although the present invention has been described above with reference to preferred embodiments, the present invention is not limited to this embodiment. Of course, various modifications can be made without departing from the gist of the present invention, such as improving induction heating efficiency and utilizing the difference in melting point during recovery.

[Brief explanation of drawings]

FIG. 1 is an explanatory view of a state in which a molten metal supply device according to the present invention is incorporated into a die-casting machine, and FIG. 2 is an enlarged explanatory view of the furnace portion of FIG. 1. 10... Die casting machine, 12... Furnace section, 1
4... Movable part, 16... Base, 18... Rail member, 20... Movable die plate, 22... End frame, 24... Fixed die plate, 25...
Tie bar, 26...Mold clamping cylinder, 28...Toggle link, 30...Crankshaft, 32...Cylinder rod, 34...Cross head, 36...Pin member, 40...Movable die, 42...Fixed die, 44 ... Hole, 46 ... Nozzle, 48 ... Heat-resistant block, 50 ... Main body, 52 ... Sleeve, 54 ... Diagonal hole, 56 ... Pellet, 57 ...
Casing, 58... Induction heating device, 60... Induction coil, 62... Molten metal outlet passage, 64... Press fit cylinder, 66... Press fit plunger rod, 68
……piston.

Claims (1)

[Scope of Claims] 1. A sleeve made of a highly permeable insulator is disposed inside the furnace body, and an oblique hole for introducing molten material is connected above the sleeve, and the oblique hole is connected to the upper part of the sleeve. An induction coil constituting an induction heating device is wound around the lower side of the sleeve, the bottom of the sleeve is directly connected to the die, and a single press-fit cylinder is arranged above the sleeve, and this press-fit cylinder is energized. A molten metal supply device, characterized in that the molten metal melted in the sleeve under the action of induction heating is fed to the die. 2. In the device according to claim 1,
The sleeve is a molten metal supply device made of ceramics.