JP2002239710A - Structure of molten metal supplying tube in casting machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain damage to a minimum by quickly detecting such trouble as flow-out of molten metal caused by breakage, etc., of a molten metal supplying tube. SOLUTION: Surrounding of a ceramic tube 15 as the molten metal supplying tube 6 is covered with a heat-insulating material 16, and on the upper part of the ceramic tube 15, bar-like heaters 17 are disposed and also, on the lower part of the ceramic tube 15, a molten metal leakage sensor 18 is disposed. Further, in the molten metal leakage sensor 18, when the molten metal leakage is detected, an interlock circuit, with which the molten metal in the center part of the ceramic tube 15 is returned back to a molten metal supplying furnace 5, is connected by working an air cylinder 11 in a pulse-rod control so as to make the inner part of a furnace to the negative pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a hot water supply pipe for supplying molten metal to a machine sleeve of a die casting machine, for example.

[0002]

2. Description of the Related Art Conventionally, there has been known a casting machine in which molten metal of a hot water supply furnace is fed into a machine sleeve of a die casting machine, and the molten metal is fed into the machine sleeve through a hot water supply pipe connecting the hot water supply furnace and the machine sleeve. As a structure of such a hot water supply pipe, for example, a structure as shown in FIG. 6 is known. The hot water supply pipe 50 is wound around a coil heater 52 over substantially the entire length so as to enclose a heat-resistant ceramic pipe 51 for flowing the molten metal, and the surroundings are covered with a heat insulating material 53 such as heat insulating wool.

[0003]

However, in the conventional structure, even if the molten metal flows out due to, for example, damage to the ceramic pipe 51, it cannot be detected quickly, and the ceramic pipe 51, the coil heater 52, The hot water supply pipe 50 including the heat insulating material 53 and the like is almost completely damaged and the damage is enormous, and there is a problem that the repair cost is enormous.

[0004] Therefore, an object of the present invention is to provide a technique capable of quickly detecting even when molten metal flows out due to, for example, damage to a ceramic tube and minimizing damage.

[0005]

In order to achieve the above object, the present invention relates to a structure of a hot water supply pipe connecting a machine sleeve of a casting machine and a hot water supply furnace, wherein a ceramic pipe for flowing molten metal is provided. A rod-shaped heater was disposed at the top of the tube, a leak detection sensor was disposed below the ceramic tube, and the periphery of the ceramic tube was covered with a heat insulating material.

By arranging the rod-shaped heater above the ceramic pipe, a leak detecting sensor can be disposed in the vicinity of the lower portion of the ceramic pipe so that even if a leak occurs, it can be quickly detected. It is possible to
Quick response is possible.

Further, in the present invention, an interlock circuit for returning the molten metal inside the hot water supply pipe to the hot water supply furnace when the hot water leak is detected is connected to the hot water leak detection sensor.

If the molten metal inside the hot water supply pipe is returned to the hot water supply furnace when the leak of hot water is detected, damage around the hot water supply pipe can be suppressed. Incidentally, as a means for returning the molten metal in the hot water supply pipe to the hot water supply furnace, for example, the inside of the hot water supply furnace in a sealed state is made to have a negative pressure.

[0009]

Embodiments of the present invention will be described with reference to the accompanying drawings. Here, FIG. 1 is a general schematic view of a casting machine employing a hot water supply pipe structure according to the present invention, FIG. 2 is an explanatory view of a connection structure of the hot water supply pipe, FIG. 3 is a cross-sectional view taken along line AA of FIG.
FIG. 4 is a sectional view taken along the line BB of FIG. 2, and FIG. 5 is a conventional view of the pressurized float.

The hot water supply pipe structure of the casting machine according to the present invention is characterized by a structure of a hot water supply pipe connecting a machine sleeve of a casting machine such as aluminum die casting and a hot water supply furnace.
Even when hot water leaks or the like occur, it is quickly detected and appropriate measures can be taken at an early stage.

That is, as shown in FIG. 1, the casting machine includes a machine sleeve 4 for injecting molten metal into a cavity 3 of a die 2 of a die casting machine 1 and a hot water supply furnace 5 for holding molten metal. A hot water supply pipe 6 is connected to the hot water supply furnace 5, and a predetermined amount of the molten metal is fed into the machine sleeve 4 through the hot water supply pipe 6 by pressurizing the molten metal in the hot water supply furnace 5 with the pressurized float 7. I try to inject.

The hot water supply furnace 5 shuts off or opens the molten metal on the pressurized float 7 and the molten metal on the molten metal surface holding float 9 for holding the molten metal level at a constant level. A partition valve 10, a water level sensor, and the like are provided. The pressurized float 7 repeatedly performs a stroke calculation with an air cylinder 11 of a pulse rod control so as to have an accuracy of ± 0.5 mm or less. Even if the resistance reaches about 60 kg due to the adhesion of aluminum oxide or the like, the resistance is calculated to ensure the operation.

As shown in FIG. 5, in the operation of the conventional general pressurized float, since the servo motor 54 is connected to the float 55 via a gear, aluminum oxide adheres to the float sliding portion. Thus, when the resistance is increased, the malfunction of the servomotor 54 is likely to occur.

The connection structure between the hot water supply pipe 6 and the machine sleeve 4 is, as shown in FIGS.
Ring 1 built into the peripheral wall of the lower surface on the base end side
2 and a connecting surface of a ceramic connecting port 13 provided below the ceramic ring 12 and provided at an end of the hot water supply pipe 6 is in surface contact with each other, and the hot water supply pipe is urged by a spring 14 (FIG. 3). 6 is connected to the machine sleeve 4 while being pressed.

At this time, the connection surface of the ceramic ring 12 and the connection surface of the ceramic connection port 13 are both mirror-finished, so that the molten metal is not leaked from the contact surface in close contact, and the machine sleeve is vibrated or the like. Even if the hot water supply pipe 4 and the hot water supply pipe 6 are relatively displaced laterally, the lateral displacement can be absorbed by sliding the connection surface.

Further, as shown in FIG. 4, the structure of the hot water supply pipe 6 is such that a heat insulating material 16 is disposed around the ceramic pipe 15 and a rod-shaped sheathed wire heater 17 is provided above the ceramic pipe 15. A leak detection sensor 18 for detecting molten metal leak is provided below the ceramic tube 15.

When the molten metal leak detection sensor 18 detects a molten metal leak, the air cylinder 1 of the pulse rod control is detected.
An interlock circuit for returning the molten metal inside the hot water supply pipe 6 to the hot water supply furnace 5 by connecting the hot water supply furnace 5 to a negative pressure by raising the pressure of the hot water supply furnace 1 is connected. Also, when the hot water supply pipe 6 is connected by pressing the ceramic connection port 13 at the front end to the ceramic ring 12 on the machine sleeve 4 side, the front end on the machine sleeve side is slightly higher and the slope on the hot water supply furnace 5 side is lower. I'm making it.

For this reason, when the inside of the hot water supply furnace 5 is set to a negative pressure, the molten metal in the hot water supply pipe 6 returns to the inside of the hot water supply furnace 5 smoothly.

In the casting machine as described above, the molten metal on the pressurized float 7 side and the molten metal on the molten metal surface holding float 9 are shut off by the partition valve 10 so that the pressurized float 7 side is sealed and pressurized. The float 7 is lowered by a predetermined stroke to feed a fixed amount of molten metal into the machine sleeve 4. At this time, the molten metal is gently fed from below the machine sleeve 4 in a sealed state, so that entrainment of air and oxides can be suppressed.

After the mold 2 is clamped and the molten metal is injected into the cavity 3 by the injection plunger 8, when the molten metal solidifies, the mold 2 is opened and the cast product is discharged. When the hot water supply pipe 6 is leaked due to damage or the like during the casting of the casting by the casting cycle, the leak detection sensor 18 immediately detects the leak and raises the pressurized float 7 through the interlock circuit, and The inside of the hot water supply pipe 6 is returned to the hot water supply furnace 5 with a negative pressure.

Therefore, damage is minimized, the restoration operation is easy, and the restoration cost is low.

The present invention is not limited to the above embodiment. Those having substantially the same configuration as those described in the claims of the present invention and exhibiting the same operation and effect belong to the technical scope of the present invention. For example, the means for pressing the hot water supply pipe 6 against the machine sleeve 4 is the spring 1
Means other than 4 may be used, and when the spring 14 is used, its position and the like are arbitrary.

[0023]

As described above, in the hot water supply pipe structure of the casting machine according to the present invention, the rod-shaped heater is disposed above the ceramic pipe for flowing the molten metal, and the leak detection sensor is provided below the ceramic pipe. Since it is arranged and the periphery of the ceramic tube is covered with a heat insulating material, even when a molten metal leaks, it can be detected promptly, and prompt measures can be taken. If an interlock circuit for returning the molten metal in the hot water supply pipe to the hot water supply furnace when the hot water leak is detected is connected to the hot water leak detection sensor, it is preferable to further suppress damage.

[Brief description of the drawings]

FIG. 1 is a general schematic diagram of a casting machine employing a hot water supply pipe structure according to the present invention.

FIG. 2 is an explanatory view of a connection structure of a hot water supply pipe.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a sectional view taken along line BB of FIG. 2;

FIG. 5 is a conventional view of a pressurized float.

FIG. 6 is an explanatory view of a conventional hot water supply pipe.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Die-casting machine, 4 ... Machine sleeve, 5 ... Hot water supply furnace, 6 ... Hot water supply pipe, 15 ... Ceramic pipe, 16 ... Heat insulation material,
17: sheathed wire heater, 18: hot water leak detection sensor.

Claims (2)

[Claims] 1. A structure of a hot water supply pipe connecting a machine sleeve of a casting machine and a hot water supply furnace, comprising: a ceramic pipe for flowing molten metal; a rod-shaped heater disposed on an upper part of the ceramic pipe; A hot water supply pipe structure for a casting machine, comprising: a leak detection sensor disposed below the ceramic pipe; and a heat insulating material covering the periphery of the ceramic pipe. 2. The hot water supply pipe structure of a casting machine according to claim 1, wherein said hot water leak sensor is connected to an interlock circuit for returning molten metal inside the hot water supply pipe to the hot water supply furnace when detecting hot water leak. Hot water supply pipe structure of casting machine.