JPH0744377Y2 - Pressure pouring furnace - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a pressure pouring furnace, and more particularly to a pressure pouring furnace for feeding a non-ferrous metal melt such as aluminum to a casting machine.

[Conventional technology]

Conventionally, as shown in FIG. 2, a heating device 41 is provided along an inner wall of a furnace body casing 42, and a crucible 43 is detachably provided in the furnace body casing 42 and a lid 44 of the crucible 43 is attached. Pressurized pouring furnace 47 provided with pressurized gas line 45 and hot water supply port 46
It has been known. The casting of the casting product by the pressure pouring furnace 47 is performed after the mold 48 is provided on the lid 44 of the crucible 43.
Stoke 49 connected to mold 48 by supplying pressurized gas into 43
The molten metal 50 in the crucible 43 is fed to the mold 48 via the.

On the other hand, the hot water inlet, the pressurizing chamber and the pouring port are connected in a siphon shape at the bottom of the furnace body, and the pressurizing chamber is provided with a pressurized gas pipeline, while the pouring port is provided with a molten metal level detector, By supplying pressurized gas from the gas pipeline into the pressurizing chamber, the molten metal stored in the furnace body is poured from a pouring nozzle of the pouring port into a mold such as a sand mold or a metal mold, and There is also known a pressure pouring furnace configured so that the molten metal surface at the pouring port before and after the molten metal can be detected by the molten metal surface detector to keep the molten metal surface at the pouring port constant. (For example, JP-A-49
(See Japanese Unexamined Patent Publication No. 2719 and Japanese Unexamined Patent Publication No. 56-19968) [Problems to be Solved by the Invention] In the former pressure pouring furnace described above, heat retention control of the molten metal 50 poured into the crucible 43 is not possible It has various advantages such as being easy to use and the melt can be easily changed because the crucible 43 is used.On the other hand, when pouring into the mold 48, the melt 50 in the crucible 43 is greatly raised and lowered in the stoke 49 and the crucible 43. There is a problem that the generated oxide may be caught and flow out.

On the other hand, in the latter pressure pouring furnace described above, the pouring amount and pouring amount are generally controlled by controlling the pressurization of the pressurizing chamber, but the pouring amount is small because the pouring port is smaller than that of the pressurizing chamber. Since the amount of drop of the molten metal surface in the pressurizing chamber is small, and the volume of the gas used for pressurization is changed, it is difficult to stably control the supply of the molten metal in a fixed amount. In addition, the upper part of the pouring port is generally open to the atmosphere, the surface of the molten metal is oxidized at this part, and when pouring into the mold, this oxide is entrained in the molten metal by the swirl flow above the pouring nozzle. There is a risk of spillage. In particular, when receiving molten metal, the molten metal surface remaining in the furnace is lowered to receive the molten metal, and as the pouring port rises, it is easy for oxides to get caught in the molten metal, and the molten metal continues to be poured after receiving the molten metal. If you do it then it will be a problem. Further, since the pouring is performed by the pressure difference between the pouring nozzle and the molten metal surface at the pouring port, the pouring time is long and the mold must be placed at a position lower than the pouring nozzle. No
Cannot perform low-pressure casting on the mold.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a pressurized pouring furnace capable of stably controlling the fixed amount of pouring of molten metal into a mold and preventing the entrainment and outflow of oxides. It is provided.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, a pressurized pouring furnace according to the present invention comprises a furnace casing having a heating source, a crucible detachably provided in the furnace casing, and a volume provided in the crucible. A pressure pouring furnace mainly composed of a body, a molten metal level gauge, and a pressure crucible having a communication hole for the crucible at the bottom, wherein the volume body penetrates through the lid of the crucible and can move up and down. In addition to being supported by the casing, an opening / closing stopper is provided in the communication hole at the bottom of the pressure crucible, and a pouring hole is provided in the side wall, and the upper end of the pouring hole is the pouring water after pouring. It is opened at a position lower than the surface level.

[Action]

The present invention has a structure in which a volume can be moved up and down in the crucible, and the crucible and the pressure crucible can be communicated with each other through a communication hole provided at the bottom of the pressure crucible, and an opening / closing stopper is provided in the communication hole. By opening the stopper for opening and closing before pouring and adjusting the amount of immersion in the melt by raising and lowering the volume in this state, the level of the molten metal in the crucible is adjusted to the specified level. Since the level is controlled and then the opening / closing stopper is closed and the pressure in the pressure crucible is increased by applying a predetermined pressure, it is possible to stably control the amount of pouring.

Also, since the side wall of the pressure crucible has a pouring hole whose upper end opens at a position lower than the level of the molten metal after pouring, during pouring, oxides etc. in the pressure crucible can be removed. The covered surface does not flow out of the pouring hole.

Further, since the pouring is performed by pressurizing the pressure crucible, low pressure casting can be performed by connecting a duct to the pouring hole.
The molten metal can be pumped to the mold.

Further, since the volume body is supported by the furnace casing so as to be vertically movable through the lid of the crucible, it is possible to easily replace the crucible by raising the volume body.

〔Example〕

An embodiment according to the present invention will be described below with reference to the drawings.

FIG. 1 is a cross-sectional explanatory view of a pressurized pouring furnace according to the present invention. In the figure, reference numeral 1 is a pressure pouring furnace, which is a refractory furnace body casing 2, a crucible 3 detachably provided in the furnace body casing 2, and a volume body provided in the crucible 3. 4, a melt level gauge 5 and a pressure crucible 6 are main components.

The refractory furnace body casing 2 is equipped with a heating device 7 along the inner surface thereof.

The crucible 3 is placed on a crucible stand 8 provided on the inner bottom of the furnace body casing 2, and a crucible lid 9 having a size reaching the upper end surface of the furnace body casing 2 is provided on the upper end surface. There is.

The volume 4 is made of a cylindrical refractory, and is provided with a rack 10 and a drive pinion 11 provided on the outer surface of the furnace casing 2.
The crucible lid 9 is attached to the lifting arm 13 of the lifting device 12 constituted by

The molten metal level gauge 5 is fixed on the upper surface of the crucible lid 9 and is provided at a position for detecting a predetermined molten metal level.

The pressure crucible 6 is composed of a ceramic bottomed cylindrical body 14 and a lid 15.
And a lower part of the cylindrical body 14 is formed with a through hole of the crucible lid 9.
The upper part of the crucible 16 is fixed to the crucible lid 9 by a support 17 provided on the lid 9. A communication hole 18 is opened at the bottom of the cylindrical body 14, and the communication hole 18 is provided at the tip of an arm 19 fixedly mounted on the upper surface of the crucible lid 9 and is a stroke drive motor.
It is openable and closable by a spindle 21 whose upper end is supported by 20. Through hole 22 of spindle 21 of lid 15 and spindle
21 is made airtight by a bellows 23. Further, a through hole 24 for pouring is formed in the side wall of the cylindrical body 14 at a position lower than the level of the molten metal after pouring, and a through hole 25 formed in the crucible 3 is penetrated there. And a pouring pipe 26 is airtightly fixed, and the end of the pouring pipe 26 is airtightly and detachably fixed to one end of a pouring connection pipe 27 penetrating the side wall of the furnace casing 2. . Further, the lid 15 is provided with a connection port 30 to the pressurized gas supply control pipeline 28 and the exhaust control pipeline 29.

31 is a casting machine comprising a die 32 and a molten metal supply cylinder 33 directly connected to the die 32.
Between the side wall of the molten metal supply cylinder 33 of 31 and the pouring connection pipe 27 penetrating the side wall of the furnace body casing 2 via a pouring duct 35 having a heater 34 on the outer peripheral surface. It is connected.

Reference numeral 36 is a drive device for moving the pressurized pouring furnace 1 back and forth with respect to the casting machine 31, and a rail 3 fixed on the floor.
7. Wheels 38 and drive cylinders 39 provided at four corners of the outer bottom of the pressurized pouring furnace 1.

Further, 40 is a heat insulating plate, which is a stroke drive motor 20.
The bellows 23 are protected from the heat of the volume body 4.

In the pressurizing pouring furnace 1 configured as described above, after a predetermined amount of molten metal is received from a ladle (not shown) or the like in the crucible 3 while the spindle 21 is raised and the communication hole 18 of the pressurizing crucible 6 is opened. The pouring into the casting machine 31 is performed as follows.

B) The volume 4 is lowered and immersed in the molten metal of the crucible 3, and the molten metal level is raised until it is detected by the molten metal level gauge 5 set at the pouring start level, and when this level is reached, the stroke Spindle 21 that was driving motor 20 and was moving up
And the communication hole 18 of the pressure crucible 6 is closed to obtain a pouring state.

(B) The pressurizing crucible 6 is supplied with an amount of pressurized gas from the air supply control pipe 28 in an amount corresponding to a preset amount of pouring of molten metal, and the molten metal surface in the pressing crucible 6 is pushed down. It is supplied to the molten metal supply cylinder 33 of the casting machine 31 through the pouring pipe 26, the pouring connection pipe 27 and the pouring duct 35.

C) While the casting machine 31 is operating, release the pressurized gas from the air supply control line 28 to the exhaust control line 29 and drive the stroke drive motor 20 to raise the spindle 21 and pressurize it. The communication hole 18 of the crucible 6 is opened.

D) The following steps from a) to c) are repeated until the casting machine
Pour into # 31.

Then, when the amount of the molten metal stored in the crucible 3 has decreased to a predetermined amount, the pressure crucible 6 is kept in the pouring state, while the volume 4 is moved upward and positioned above the crucible 3. A predetermined amount of molten metal is received in the crucible 3 from an external ladle or the like.

Therefore, the molten metal in the pressurizing crucible 6 does not descend from the pouring port of the pouring pipe 26 during pouring, and the molten metal discharged from the pouring connection pipe 27 is applied to the heater 34 on the outer peripheral surface. Since it flows in the pouring duct 35 equipped with and is poured into the casting machine 31,
Oxidation of the molten metal is suppressed and there is no inclusion of oxides in the molten metal. Further, control such as fixed amount supply of the pouring amount to the casting machine 31 can be stably performed.

Further, because of the crucible structure, it is possible to easily perform processing such as pumping out the residual hot water in the crucible 3, and when the type of molten metal is changed frequently, use the crucible 3 having a relatively small capacity to change the molten metal. Can be done more easily.

In the above embodiment, an example in which the melt prepared in advance is received in the crucible 3 has been described. However, a raw material such as aluminum is put into the crucible 3 and the heating device 7 mounted on the inner surface of the furnace casing 2 is installed. Use to melt, thereby obtain molten metal and casting machine
You may also pour into 31.

[Effect of device]

As described above, according to the pressure pouring furnace according to the present invention,
It is possible to perform stable control of the pouring amount, etc., and the pouring hole on the side wall of the pressure crucible is opened at a position lower than the level of the molten metal after pouring. Since there is no entanglement of oxides and the pouring is performed by pressurizing the pressure crucible, low-pressure casting can be performed by connecting the pouring duct to the pouring pipe, and the molten metal can be pumped to the mold. .

[Brief description of drawings]

FIG. 1 is a sectional explanatory view of a pressurized pouring furnace according to the present invention, and FIG. 2 is an explanatory view of a conventional technique. 1 ... Pressurized pouring furnace, 2 ... Furnace casing 3 ... Crucible, 4 ... Volume 5 ... Level gauge, 6 ... Pressurized crucible 7 ... Heating device, 8 ... Crucible stand 9 ...... Crucible lid, 10 ...... Rack 11 ...... Drive pinion, 12 ...... Elevating device 13 ...... Elevating arm, 14 ...... Cylindrical body 15 ...... Lid, 17 ...... Supporting tool 16,22,24,25 ... … Through hole 18 …… Communication hole, 19 …… Arm 20 …… Stroke drive motor 21 …… Spindle, 23 …… Bellows 26 …… Pouring pipe, 27 …… Pouring connection pipe 28 …… Air supply control pipe Channel, 29 ... Exhaust control pipeline 30 ... Connection port, 31 ... Casting machine 32 ... Mold, 33 ... Molten metal supply cylinder 34 ... Heater, 35 ... Pouring duct 36 ... Driving device, 37 …… Rail 38 …… Wheels, 39 …… Driving cylinder 40 …… Heat shield

Claims (1)

[Scope of utility model registration request] 1. A furnace body casing provided with a heating source, a crucible detachably provided in the furnace body casing, a volume body, a melt level gauge, and a crucible at the bottom provided in the crucible. A pressure pouring furnace mainly composed of a pressure crucible having a communication hole, wherein the volume body is supported by a furnace body casing so as to vertically move through a lid of the crucible,
An opening / closing stopper is provided in the communication hole at the bottom of the pressure crucible,
Further, the pressurizing pouring furnace is characterized in that each of the side walls is provided with a pouring hole, and an upper end portion of the pouring hole is opened at a position lower than a molten metal surface level after pouring.