JP2003039160A - Supply path construction for molten metal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the dripping of a molten metal from a discharge path to be quickly stopped, after, supplying a predetermined amount of the molten metal, while enabling the molten metal to be surely supplied in a casting equipment. SOLUTION: In the supply path construction for the molten metal, wherein by erecting a carrying terminal side of a pipeline 18 capable of carrying the molten metal B in the horizontal direction upward, a molten metal supply path 2, to which the discharge path 19 capable of discharging the molten metal downward is connected in the vertical direction, is provided on its terminal part, an opening 22 for introducing an inert gas to the connection place between the pipeline and the connecting place is provided on the upper part of the connecting place, a heating means 24 for heating the molten metal in the molten metal supply path is provided along the molten metal supply path excepting the discharge path.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention raises a conveying end side of a pipeline capable of laterally transporting a molten metal upward, and vertically extends a discharge passage capable of discharging the molten metal downward at the terminal end thereof. The present invention relates to a molten metal supply path structure in which a molten metal supply path connected to the above is provided, and an opening for introducing an inert gas into a connection point between the pipeline and the discharge path is provided above the connection point.

[0002]

2. Description of the Related Art The above-mentioned structure for supplying molten metal enables the molten metal that has been laterally conveyed to be discharged downward at a fixed position regardless of the conveying speed when the molten metal is supplied to a casting apparatus or the like. A molten metal supply passage is provided at a terminal end of a pipe line capable of laterally conveying the molten metal so that a discharge passage capable of discharging the molten metal downward is vertically connected.

After supplying a predetermined amount of the molten metal to the casting apparatus or the like, the supply of the molten metal can be stopped quickly, and the amount of the molten metal remaining in the molten metal supply path is made substantially constant. In order to be able to make the supply amount of the constant, the opening is provided in the upper part of the connection point between the pipeline and the discharge path, and the transport end side of the pipeline is raised upward,
The liquid level of the metal melt remaining in the melt supply passage can be held at a substantially fixed position on the end of the transfer route of the pipe line so that air will not flow in through the opening and the metal melt will not react with oxygen etc. The inert gas is introduced through the opening.

In the conventional molten metal supply passage structure, heating means for heating the molten metal in the molten metal supply passage is provided along substantially the entire length of the molten metal supply passage extending from the pipe passage to the discharge passage.

[0005]

Since the heating means for heating the molten metal in the molten metal supply passage is provided along substantially the entire length of the molten metal supply passage, it is possible to reliably supply the molten metal to a casting apparatus or the like. Since the heating means is provided along the discharge path for discharging the molten metal downward, the molten metal adhering to the inside of the discharge path is heated by the heating means even after the predetermined amount of the molten metal is supplied to the casting device or the like. It has a drawback that it is hard to be solidified by being heated by and the metal melt tends to drip from the discharge passage forever.

Further, in the case where the metal melt is a magnesium alloy melt which easily reacts with oxygen, when air enters the discharge passage through the opening, the high-temperature magnesium alloy melt adhering to the discharge passage is oxidized and burned. There is a drawback that it is easy to do.

The present invention has been made in view of the above circumstances, and after supplying a predetermined amount of molten metal while surely supplying the molten metal to a casting apparatus or the like, the molten metal is discharged from the discharge passage. The purpose is to be able to quickly stop the drooping of.

[0008]

According to the characterizing feature of the invention described in claim 1, the conveying terminal side of a pipe line capable of laterally conveying the molten metal is raised upward, and the molten metal is directed downward at the end portion. A molten metal supply path in which discharge paths capable of discharging are vertically connected is provided, and an opening for introducing an inert gas is provided at a connection point between the pipe path and the discharge path at an upper portion of the connection point. In a certain molten metal supply path structure, heating means for heating the molten metal in the molten metal supply path is provided along the molten metal supply path except the discharge path.

[Operation] Since the heating means for heating the molten metal in the molten metal supply path is provided along the molten metal supply path excluding the discharge path, the molten metal can be reliably supplied to the casting apparatus and the like. When the supply of molten metal is stopped, the molten metal adhering to the inside of the discharge passage is naturally cooled and easily solidifies. Then, when the molten metal flows into the discharge passage as the supply of the molten metal is restarted, the metal solidified in the discharge passage is melted by heating by the molten metal and discharged from the discharge passage.

[Effect] After supplying a predetermined amount of the metal melt while surely supplying the metal melt to the casting apparatus or the like, the metal melt adhering to the discharge passage is easily solidified, and It is possible to quickly stop dripping from the discharge passage.

A second aspect of the invention is characterized in that the metal melt is a magnesium alloy melt.

[Operation] When the supply of the molten metal is stopped, the magnesium alloy molten metal adhering to the inside of the discharge passage is naturally cooled and easily solidifies. Therefore, air enters the discharge passage through the opening. However, the magnesium alloy is difficult to react with oxygen.

[Effect] The magnesium alloy in the discharge passage is less likely to oxidize and burn.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a pouring device for pouring a molten metal B of a magnesium alloy into a mold C1 of a casting device C as an example of a molten metal, and includes a molten metal pump 1 and a molten metal supply path 2 for supplying the molten metal B to the mold C1. A switching valve 3 for switching the flow path between a state in which the molten metal B in the molten metal furnace D can be sucked into the molten metal pump 1 and a state in which the molten metal B sucked into the molten metal pump 1 can be discharged to the molten metal supply passage 2 is provided. A molten metal supply path structure A according to the present invention is provided so that the molten metal B discharged from the pump 1 can be poured into the mold C1 through the molten metal supply path 2.

The molten metal pump 1 has a ceramic cylinder case 4 fixed so as to be entirely immersed in the molten metal B in a melting furnace D, and a ceramic piston which is vertically reciprocally movable in the cylinder case 4. 5, and a piston driving pneumatic cylinder 7 for vertically reciprocating a piston rod 6 formed integrally with the piston 5,
Of the molten metal in the molten metal furnace D by moving the piston 5 upward by connecting the suction / exhaust passage 8 of the same to the vicinity of the bottom of the cylinder case 4.
The molten metal B in the cylinder case 4 can be sucked into the cylinder case 4 through the suction / discharge passage 8, and the molten metal B in the cylinder case 4 can be discharged through the suction / discharge passage 8 by moving the piston 5 downward.

In the switching valve 3, a case body 9 of a cylinder case 4 is formed with a valve box 10, the entire valve box 10 is provided in a molten metal B in a molten metal furnace D, and a valve rod 11 is integrally formed. A ceramic valve body 12 is installed in the valve box 10 so as to be movable up and down, and an intake passage 13 communicating with the melt furnace D and a discharge passage 14 communicating with the melt supply passage 2 are provided.
And the suction and discharge passage 8 are formed so as to open into the valve body moving space 15.

Then, by the expansion and contraction operation of the pneumatic cylinder 16 for operating the valve, an intake position for connecting the intake passage 13 to the intake and exhaust passage 8 and blocking the communication between the exhaust passage 14 and the intake and exhaust passage 8.
The discharge passage 14 is connected to the suction and discharge passage 8 and the suction passage 13 is connected.
And the valve body 12 at the discharge position where the communication between the suction and discharge passage 8 is blocked.
Is provided so that it can be moved vertically.

Explaining the supply passage structure A, a ceramic cylindrical pouring pipe 17 is connected to the discharge passage 14 to provide a pouring pipe passage 18 capable of laterally conveying the molten metal B, and The molten metal pipe 17 is bent obliquely upward to raise the conveying end side of the pouring pipe line 18 obliquely upward, and a discharge passage 19 capable of discharging the molten metal B downward is vertically connected to the end portion thereof to form the molten metal. A supply path 2 is provided.

In the discharge passage 19, a ceramic cylindrical discharge pipe 20 is connected and fixed to the end portion of the pouring pipe 17 substantially vertically, and the molten metal B conveyed along the pouring pipe passage 18 is supplied. A cap 21 is provided on the upper portion of the discharge pipe 20 so as to be capable of discharging downward.
And an opening 22 for introducing an inert gas into the cap 21 at the connection between the pouring pipe line 18 and the discharge line 19.
And the conduit 23 for supplying the inert gas is provided with the opening 22
Connected to.

The molten metal supply path 2 excluding the discharge path 19,
That is, a heating means 24 for heating the molten metal B in the pouring pipe line 18 is provided along the pouring pipe line 18, and the pouring pipe 17 is covered with a heat-resistant heat insulating material 26 over substantially the entire length thereof. There is.

The heating means 24 is a metal heating element 25 such as a nichrome wire which generates Joule heat when energized.
Is wound around the outer periphery of the pouring pipe 17 inside the heat insulating material 26 in a coil shape, and the metal heating element 25 is energized to supply the pouring pipe line 1
The molten metal B in 8 can be heated.

Other Embodiments 1. The molten metal supply path structure according to the present invention may be provided for supplying the molten metal to a ladle or the like. 2. The supply path structure for molten metal according to the present invention has a pipeline capable of laterally transporting the molten metal, which rises upward from the transport start end side to the transport end side, and the metal melt is directed downward at the end portion. A molten metal supply path may be provided in which discharge paths capable of discharging are vertically connected. 3. The molten metal supply path structure according to the present invention may be provided with heating means for heating the molten metal in the molten metal supply path along a part of the molten metal supply path except the discharge path. 4. The heating means provided in the molten metal supply path structure according to the present invention may be one that heats by direct resistance heating, induction heating, dielectric heating or the like in addition to indirect resistance heating by a metal heating element or a non-metal heating element. . 5. The molten metal supply path structure according to the present invention may be provided to supply a molten metal such as aluminum, zinc, or tin.

[Brief description of drawings]

1] Partial cross-sectional side view of a pouring device

[Explanation of symbols]

B Metal melt 2 Molten metal supply path 18 pipelines 19 discharge path 22 opening 24 Heating means

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hiroshi Yamaguchi             2-47 Shikitsuhigashi, Naniwa-ku, Osaka-shi, Osaka               Kubota Corporation

Claims (2)

[Claims] 1. A molten metal in which a conveying terminal side of a pipeline capable of laterally transporting a molten metal is raised upward, and a discharge path capable of discharging the molten metal downward is vertically connected to the terminal end. A supply path is provided, and an opening for introducing an inert gas into a connection point between the pipe path and the discharge path is a supply path structure of the molten metal provided at the upper part of the connection point, wherein the discharge path is A molten metal supply path structure in which heating means for heating the molten metal in the molten metal supply path is provided along the molten metal supply path to be removed. 2. The supply path structure for a metal melt according to claim 1, wherein the metal melt is a magnesium alloy melt.