JP2012179616A - Casting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a casting device capable of measuring the timing or time of molten metal pouring even when casting while controlling the atmosphere in a molten metal-retaining furnace or in a mold.SOLUTION: In the casting device comprising making the tapping hole of the molten metal-retaining furnace in close contact with the sprue 11 of a mold 10 and casting while controlling the atmosphere in the furnace and/or in the mold 10, a communicating hole 50 is provided to the sprue 11 to communicate the inside of the mold 10 with the outside, and a slit body 51, a heat-resistant glass 52 and a molten metal detector 53 are provided to the communicating hole 50 in turn from a sprue side.

Description

  The present invention relates to a casting apparatus in which a molten metal holding furnace is brought into close contact with a mold.

  Conventionally, in a casting apparatus for casting a casting such as a camshaft, for example, an infrared sensor is provided between a molten metal holding furnace and a mold, and by detecting light emitted from the molten metal by the infrared sensor, the start of pouring and A device for measuring the end timing and the pouring time during which the molten metal is poured is known (for example, see Patent Document 1).

JP-A-5-318073

However, in the above conventional configuration, a space for detecting the molten metal is required between the molten metal holding furnace and the mold, so that the molten metal holding furnace is brought into close contact with the mold, and the pressure and temperature in the molten metal holding furnace or in the mold. In the case of casting while adjusting the atmosphere such as the type of gas, the infrared sensor cannot be arranged, and the pouring timing and pouring time cannot be measured.
The present invention has been made in view of the above circumstances, and provides a casting apparatus capable of measuring the pouring timing and pouring time even when casting while adjusting the pressure in the molten metal holding furnace or the mold. The purpose is to do.

In order to achieve the above object, the present invention provides a casting apparatus for casting while adjusting the atmosphere in the molten metal holding furnace and / or the mold by bringing the outlet of the molten metal holding furnace into close contact with the molten metal pouring gate. A communication hole communicating between the inside and the outside of the mold is provided, and the communication hole is provided with a slit body, heat-resistant glass, and molten metal detection means from the gate side.
According to the above configuration, since the communication hole is provided with a communication hole that communicates the inside and outside of the mold, and the communication hole is provided with the slit body, the heat-resistant glass, and the molten metal detection means from the gate side, While maintaining the atmosphere, the molten metal can be detected by the molten metal detection means provided in the communication hole communicating between the inside and outside of the mold. Moreover, since the slit body was provided in the communicating hole on the gate side, it is possible to obtain a heat insulating effect and to prevent the molten metal from contacting the heat resistant glass.

The said structure WHEREIN: You may provide the said communicating hole in the molten metal holding furnace side rather than the molten metal pool provided in the runway of the said casting_mold | template.
According to the above configuration, since the communication hole is provided closer to the molten metal holding furnace than the molten metal pool, it is possible to prevent the molten metal from flowing into the communication hole even when the molten metal has a poor circulation.

  According to the present invention, the communication hole is provided with a communication hole that communicates the inside and outside of the mold, and the communication hole is provided with the slit body, the heat-resistant glass, and the molten metal detection means from the gate side. While maintaining the atmosphere, the molten metal can be detected by the molten metal detection means provided in the communication hole communicating between the inside and outside of the mold, and as a result, the outlet of the molten metal holding furnace is brought into close contact with the molten metal inlet of the mold, Even when casting while adjusting the atmosphere, the pouring timing and pouring time can be measured. Moreover, since the slit body was provided in the communicating hole on the gate side, it is possible to obtain a heat insulating effect and to prevent the molten metal from contacting the heat resistant glass.

  In addition, since the communication hole is provided on the molten metal holding furnace side with respect to the molten metal reservoir, it is possible to prevent the molten metal from flowing into the communication hole even in the case where a defect in the molten metal occurs.

It is a figure which shows typically the casting apparatus which concerns on embodiment of this invention. It is a figure which expands and shows a communicating hole. It is a figure which shows the casting apparatus after molten metal pouring. It is a figure which shows the casting apparatus after the molten metal pouring at the time of poor hot water circulation. It is a figure which shows typically the casting apparatus which concerns on the modification of this invention.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a schematic diagram showing a casting apparatus according to the present embodiment.
The casting apparatus 1 is generally configured to include a mold 10 and a molten metal holding furnace 20. The molten metal holding furnace 20 includes, for example, a furnace body 21 that stores a molten metal M in which a cast iron material is melted, and a discharge port 22 for discharging the molten metal M is formed at the bottom of the furnace body 21. In the furnace body 21, for example, a supply port 26 for supplying the molten metal M into the furnace body 21 is formed at the top, and the supply port 26 is provided with an openable and closable upper lid 27. The upper lid 27 is opened when the molten metal M is supplied to the furnace body 21, and is configured to seal the interior of the furnace body 21 during closing.

In the furnace body 21, a rod-shaped stopper 30 that opens and closes the hot water outlet 22 is provided through the top of the furnace body 21. The stopper 30 is configured to be movable up and down by a drive source (not shown) such as an air cylinder, and is disposed so as to close the tap hole 22 at a lower position. A sealing material (not shown) is provided between the top of the furnace body 21 and the stopper 30 so that the sealed state of the furnace body 21 can be maintained even when the stopper 30 moves up and down. A pressure adjusting means 40 for adjusting the pressure in the furnace body 21 is connected to the furnace body 21 via a pressure path 40A. The pressure path 40A passes through the furnace body 21 and communicates with the furnace body 21, and is connected to the furnace body 21 in an airtight manner by a sealing material (not shown).
The furnace body 21 is disposed on the mold 10 such that the pouring gate 22 faces the pouring gate 11 of the casting mold 10. A sealing member 45 is provided between the mold 10 and the furnace body 21 so as to surround the gate 11 and the outlet 22, and the inside of the mold 10 and the furnace body 21 are sealed. The seal member 45 is made of, for example, silicon rubber.

  The mold 10 is a copper mold for casting two camshafts as an example of a casting, and the mold 10 is provided with a cooling means (not shown). The mold 10 includes a fixed mold 10A (for example, the lower half of the mold 10 in the direction perpendicular to the paper surface) and a movable mold 10B (for example, the upper half of the mold 10 in the direction of the paper surface), and the fixed mold 10A and the movable mold 10B can be opened and closed with respect to each other. Has been. FIG. 1 is a diagram showing the fixed mold 10A from the movable mold 10B side. The mold 10 includes a gate 11, a main runner 12, a sub runner 13, a choke 14, a filter 15, a gas vent hole 16, a gate 17, and a cavity 18 on the mating surface of the fixed mold 10 </ b> A and the movable mold 10 </ b> B. The configuration of the mold 10 is symmetrical with respect to the main runner 12.

  The gate 11 is an inlet for the molten metal M. The main runner 12 is a runner that supplies the molten metal M injected from the gate 11 to the left and right sub-runners 13, and a molten metal reservoir 12 </ b> A for accumulating the molten metal M is formed on the main runner 12. The sub runner 13 is a runner that supplies the molten metal M from the main runner 12 to the cavity 18. The choke 14 is a throttle portion that is provided on the inlet side of the sub-runner 13 and decelerates the flow rate of the molten metal M supplied to the sub-runner 13. The filter 15 is provided between the choke 14 and the gate 17 in the sub-runner 13 and removes gas and foreign matter in the molten metal M. The vent hole 16 is connected to the sub-runner 13 and discharges gas generated from the molten metal M. The gate 17 is provided on the outlet side of the sub-runner 13 and is connected to the cavity 18. One left and right gates 17 are provided corresponding to the number of cavities 18. The mold 10 is a sealed mold in which the cavity 18 is sealed.

In the present embodiment, in the main runner 12, the molten metal reservoir 12A is provided at a distance from the upper surface 10C of the mold 10, and the molten metal reservoir 12A is a passage 12B made smaller than the molten metal reservoir 12A. Yes. A communication hole 50 communicating with the outside of the mold 10 is connected to the passage 12B, avoiding the mating surface of the fixed mold 10A and the movable mold 10B. FIG. 2 shows the communication hole 50 in an enlarged manner.
The communication hole 50 is formed so as to be orthogonal to the passage 12B (pouring gate 11). The communication hole 50 is provided with a slit body 51, heat-resistant glass 52, and molten metal detection means 53 from the pouring gate 11 side. . The slit body 51 is formed of stainless steel, for example, and has a plurality of slits 51 </ b> A that penetrates the slit body 51 linearly along the communication direction of the communication hole 50. The cross-sectional shape of the slit 51A is not limited. The slit body 51 is arranged so as not to protrude into the passage 12B, or on the same surface as the passage 12B or toward the outside (heat-resistant glass 52 side) from the passage 12B.

The heat-resistant glass 52 is formed of a glass that can withstand a relatively high temperature, such as quartz glass. The heat resistant glass 52 has a cross-sectional shape that is substantially the same as that of the communication hole 50, and is fitted into the communication hole 50 via a packing 54 such as an O-ring. It is desirable that the heat-resistant glass 52 be disposed apart from the slit body 51.
The molten metal detection means 53 is a sensor that detects the molten metal M poured from the pouring gate 11, and the molten metal detection means 53 includes, for example, an infrared sensor that detects light emitted from the molten metal M, a visible light sensor, and the like. An optical sensor is used. The communication hole 50 is formed in such a size that the molten metal detection means 53 can detect the light of the molten metal M flowing through the passage 12B.

Next, the operation of the present embodiment will be described with reference to FIGS. FIG. 3 is a view showing the casting apparatus 1 after the molten metal pouring, and FIG. 4 is a view showing the casting apparatus 1 after the molten metal pouring when the hot water is poor.
Referring to FIG. 1, first, the fixed mold 10A and the movable mold 10B are clamped. A sealing member 45 is disposed on the mold 10 so as to surround the gate 11, and the furnace body 21 is disposed on the mold 10 so that the outlet 22 faces the gate 11. The mold 10 is in close contact. In the molten metal holding furnace 20, the stopper 30 is lowered to close the hot water outlet 22, and the molten metal M is supplied into the furnace body 21 from the supply port 26 with the upper lid 27 opened. When the supply of the molten metal M for one time is finished, the upper lid 27 is closed, and the inside of the sealed furnace body 21 is pressurized by the pressure adjusting means 40. When the pressure in the furnace body 21 rises to a predetermined pressure, the stopper 30 is raised, and the molten metal M in the furnace body 21 is poured smoothly into the mold 10 due to the pressure difference between the furnace body 21 and the mold 10 and gravity. Is done.

In the present embodiment, as shown in FIG. 2, a communication hole 50 is provided in the gate 11, and since the heat resistance glass 52 and the molten metal detection means 53 are provided in the communication hole 50 from the side of the gate 11, The molten metal detection means 53 can detect the light of the molten metal M while maintaining the atmosphere in the mold 20 and the mold 10. Therefore, even when the furnace body 21 is brought into close contact with the mold 10 and casting is performed while adjusting the pressure in the mold 10 and the furnace body 21, the pouring timing and pouring time can be measured.
Since the heat-resistant glass 52 is fitted into the communication hole 50 via the packing 54, the inside of the mold 10 and the furnace body 21 and the outside are surely cut off, so that the pressure inside the furnace body 21 and the mold 10 is reliably maintained. can do.

  Since the slit body 51 is provided on the side of the gate 11 of the heat-resistant glass 52, an air layer is formed by the slit body 51 and a heat insulation effect is obtained. Therefore, the heat-resistant glass 52 and the packing 54 are disposed outside the slit body 51 in the communication hole 50. The temperature can be maintained. Since the slit 51 </ b> A of the slit body 51 is formed so as to be substantially along the communication direction of the communication hole 50, the molten metal light leaking from the slit body 51 can be detected by the molten metal detection means 53.

  Since the communication hole 50 is provided in the passage 12B which is made smaller on the top of the molten metal reservoir 12A, the molten metal M is melted as shown in FIG. The molten metal M is difficult to enter the communication hole 50 even when the filling is completed. Even if the molten metal M overflows from the molten metal pool 12A, the slit body 51 can prevent the molten metal M from coming into direct contact with the heat-resistant glass 52 and prevent damage to the heat-resistant glass 52 and the like.

  As described above, according to the present embodiment, the communication hole 50 that communicates the inside and outside of the mold 10 is provided in the pouring gate 11, and the slit body 51, the heat-resistant glass 52, and the molten metal detection means 53 are provided in the communication hole 50 from the pouring gate 11 side. It was set as the structure provided. With this configuration, the molten metal M can be detected by the molten metal detection means 53 provided in the communication hole 50 communicating between the inside and outside of the mold 10 while the atmosphere inside the molten metal holding furnace 20 and the mold 10 is held by the heat resistant glass 52. As a result, even when casting while adjusting the pressure in the molten metal holding furnace 20 or the mold 10 by bringing the outlet 22 of the molten metal holding furnace 20 into close contact with the molten metal inlet 11 of the mold 10, the pouring timing and pouring time can be reduced. It can be measured. Further, since the slit body 51 is provided in the communication hole 50 on the side of the gate 11, a heat insulating effect can be obtained and the molten metal M can be prevented from coming into contact with the heat resistant glass 52.

  In addition, according to the present embodiment, since the communication hole 50 is provided on the molten metal holding furnace 20 side with respect to the molten metal reservoir 12A, the molten metal M is in the communication hole 50 even when a molten metal around the molten metal M is defective. Can be prevented.

However, the above embodiment is an aspect of the present invention, and it is needless to say that the embodiment can be appropriately changed without departing from the gist of the present invention.
For example, in the above-described embodiment, the communication hole 50 is formed horizontally so as to be substantially orthogonal to the gate 11, but may be formed obliquely with respect to the gate 11.

  In the above-described embodiment, the communication hole 50 is formed in the passage 12B that is made smaller on the top of the molten metal reservoir 12A. However, the molten metal reservoir 121A is formed from the upper surface 10C of the mold 110 as in the casting apparatus 100 shown in FIG. The communication hole 50 may be formed in the upper part of the pool 112A. Also in this case, the molten metal M is unlikely to enter the communication hole 50 when the filling of the molten metal M is completed or when the molten metal M is accumulated in the molten metal pool 112 </ b> A due to poor hot water circulation.

Moreover, in the said embodiment, although the pressure adjustment means was connected to the furnace body, you may connect to a casting_mold | template or you may connect to both a furnace body and a casting_mold | template. In any case, the furnace body may be pressurized against the pressure in the mold during pouring.
In the above embodiment, the present invention is applied to a casting apparatus that adjusts the pressure as the atmosphere in the furnace and / or the mold. However, the present invention is not limited to this, and the atmosphere in the furnace and / or the mold is used. The present invention may be applied to a casting apparatus that adjusts the temperature and a casting apparatus that replaces air with another gas.

DESCRIPTION OF SYMBOLS 1,100 Casting device 10,110 Mold 11 Pouring gate 12A, 112A Molten pool 20 Molten holding furnace 22 Outlet port 50 Communication hole 51 Slit body 52 Heat resistant glass 53 Molten metal detection means M Molten metal

Claims (2)

In the casting apparatus for casting while adjusting the atmosphere in the molten metal holding furnace and / or the mold, the outlet of the molten metal holding furnace is brought into close contact with the pouring gate of the mold,
A communicating hole is provided in the gate for communicating inside and outside the mold,
A casting apparatus comprising a slit body, heat-resistant glass, and molten metal detection means from the gate side in the communication hole.   The casting apparatus according to claim 1, wherein the communication hole is provided closer to a molten metal holding furnace than a molten metal pool provided in the runway of the mold.

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