JPH058008A - Centrifugal casting apparatus in vacuum - Google Patents

Abstract

PURPOSE:To facilitate take-out of a casting product and maintenance of a casting apparatus by loading a centrifugal casting apparatus, rotary table, driving motor, power transmitting device, etc., on a shifting carriage and enabling carry-in/out to a vacuum tank. CONSTITUTION:In the vacuum tank 1, molten metal from an induction melting furnace 2 is poured into a centrifugal casting mold 3 through a tundish 3a. Successively, while rotating the above mold 3 with the driving motor 9 through the rotary table 4, the casting is executed. In the above centrifugal casting apparatus in the vacuum, the power transmitting device composed of a rotary shaft 5, pulleys 7, 7a and a belt 8 together with the motor 9, is hermetically incorporated in an incorporating vessel 13 and in this inner part, gas 12, such as inert gas, the air, is charged. The casting apparatus having these devices is held as liftable with a fixed table (not shown in the figure). Further, the casting apparatus containing the above mold 3 is loaded on the shifting carriage 14 and shifted on the wheels 15, and by opening/closing a door 19, this can be freely carried in/out to the vaccum tank 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum melting / centrifugal casting apparatus for performing vacuum melting in vacuum followed by centrifugal casting. More specifically, the present invention relates to a vacuum melting furnace and a mold in a vacuum tank. In a vacuum melting furnace having a mechanism for moving in and out of a tank, after vacuum melting, centrifugal casting was performed in a vacuum atmosphere, and then the mold of the centrifugal casting device, a rotary table, and a rotary force imparting mechanism were integrally combined. With the state kept, the mold is placed on a moving device such as a moving carriage, and the carriage moving mechanism is used to move it out of the vacuum tank to take out the cast product, and after taking out, it is returned to the vacuum tank by the moving mechanism,
The present invention relates to an in-vacuum centrifugal casting apparatus having a structure capable of performing centrifugal casting, gravity casting and the like in a vacuum atmosphere after vacuum melting.

[0002]

2. Description of the Related Art In a conventional vacuum centrifugal casting apparatus having the structure shown in FIG. 4, the inside of a vacuum tank 1 is evacuated by a vacuum exhaust device (not shown), and vacuum melting is performed by an induction melting furnace 2. The centrifugal casting mold 3 is fixed to a rotary table 4, and a motor 9 is driven by a rotary shaft 5, a bearing 6, a rotary shaft pulley 7, a motor shaft pulley 7a, and a rotation transmission belt 8. Is rotated by. The shaft seal 6a such as an O-ring transmits rotation into the vacuum tank 1 while maintaining the degree of vacuum in the vacuum tank 1. With this configuration, the molten metal melted in the induction melting furnace 2 is poured through the tundish 3a into the centrifugal casting mold 3 that is rotated by the above configuration.
After pouring, the atmosphere introducing valve (not shown) is opened, the inside of the vacuum tank 1 is set to atmospheric pressure, the door 19 of the vacuum tank is opened, and the centrifugal casting mold 3 is taken out to obtain a casting product as a product. There is.

[0003]

As shown in FIG. 4, in order to perform casting repeatedly by melting and casting with a conventional vacuum melting and casting apparatus, the door 19 of the vacuum tank is opened and centrifugal casting is performed. The mold 3 is taken out to take out the cast product, and when repairs are finished as necessary, the centrifugal cast mold 3 taken out is returned to the vacuum tank 1 and fixed on the rotary table 4, and then the door is opened. After closing, melting, and casting, as described above, it is necessary to repeat the work of opening and removing the door each time, especially when the centrifugal casting mold 3 is large, the work becomes very troublesome. . Also in the vacuum tank 1
Using the rotary table 4 installed in the same as it is, it must be removed when performing another casting method such as gravity casting after vacuum melting, and it is still placed in the vacuum tank 1 for maintenance. It will be done in the state of, and the work will be very difficult. Therefore, a complicated centrifugal casting apparatus composed of the members 3 to 9 in FIG. 4 is used as a mold driving mechanism assembly that rotationally drives the mold and the mold, and a structure in which these are detachably connected is used. There has been a demand for a vacuum melting centrifugal casting device that can be freely moved in and out of the tank. In addition, the mold for rotating the mold
Since a special electric motor such as a vacuum motor is required as a motor, there has been a demand for a measure to use a normal motor that can be used under atmospheric pressure.

[0004]

[Means for Solving the Problems] 1) Like the conventional method,
The casting mold was detachably attached to the rotary table placed in the vacuum tank, and the door of the vacuum tank was opened before and after the start of melting and casting, and only the mold was moved in and out of the vacuum tank. Instead of the device, the present invention uses a rotating table for the mold.
While it is still attached to the rotary drive and rotary drive, it is moved from the outside to the inside of the vacuum tank by a moving device such as a moving carriage and fixed in the vacuum tank for vacuum centrifugal casting, and vice versa. It is mounted on a moving device in a state where it is mounted on a table and a rotation driving device, and is released from the vacuum tank by releasing the fixation to the vacuum tank. The rotary table and the rotary driving device may be detachably fixed to the vacuum tank while being mounted on a moving device such as a moving carriage. The door of the vacuum chamber has a size such that the casting mold, the rotary table and the motor storage container are integrally combined so that the door can be moved in and out while being mounted on the moving carriage. 2) Also, the rotary shaft of the motor that drives the rotary table to rotate,
The rotary shaft part of the rotary table, of both rotary shafts, at least the motor is housed in a storage container, and the interior of this storage container is filled with an inert gas such as argon or air and is the same as the atmospheric pressure. The casting mold, the rotary table and the motor storage container are integrally connected by keeping the internal pressure or by communicating with the atmosphere outside the vacuum chamber with atmospheric pressure by means of a seal pipe sealed in the vacuum chamber. It is possible to move between the vacuum chamber and the outside by a movable carriage that can be moved by wheels while using a jack mechanism when centrifugal casting is performed, and it is lifted together with the movable carriage or lifted from the movable carriage to fix the vacuum chamber. The problem was solved by being fixed to. The means for solving the above 1) and 2) can achieve some actions and effects even if both are adopted independently, but it is more effective if both are used in combination.

[0005]

To perform the melting and casting operations, the door of the vacuum chamber is opened, the centrifugal casting mold on the moving device such as a moving carriage is introduced into the vacuum chamber, and the casting mold, rotary table and motor storage container are integrated. While still mounted on the moving carriage in a state of being connected to the moving carriage, or separated from the moving carriage and fixed to a fixed base in the vacuum tank to finish the mounting. In this state, the weight of the centrifugal casting mold and the moving carriage is applied to the fixed base. Then, the door is closed, the inside of the vacuum tank is evacuated, the pressure is reduced to a predetermined degree of vacuum, and the melting is started. When the melting is completed, the rotary table is rotated by the motor in the motor container to perform centrifugal casting. The motor storage container is
When the inside is filled with an inert gas such as argon, the inside of the vacuum tank and the atmosphere outside the tank are sealed and kept at atmospheric pressure, and the inside is filled with an inert gas such as argon. Also, since it is maintained at atmospheric pressure when communicating with the atmosphere outside the vacuum tank, it is not necessary to use a special motor such as a vacuum motor, and the usual atmospheric pressure is used. Motor can be used. When the casting is completed, open the door and introduce the atmosphere into the tank, and the mold containing the casting, the rotary table and the motor storage container are connected together as a unit outside the vacuum tank by the moving carriage. The casted product is taken out of the tank and the series of operations is completed.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 1 and 2, the same members as those in the conventional device are indicated by the same reference numerals. Figure 1
Is the overall arrangement of the centrifugal casting apparatus in vacuum as an embodiment of the present invention, and particularly, the motor storage container 13 and the motor, the rotary table 4, the rotary shaft 5, the bearing 6, the rotary shaft plug. −
Arrangement of the main members such as the mold drive mechanism assembly such as the reel 7 and the motor shaft pulley 7a, the piping of the cooling water into the motor storage container 13, and the connection with the external power source of the motor 9. It is a front view shown. To avoid complicating the drawing, a device for supporting and fixing a motor storage container 13 described later is shown as removed from FIG. FIG. 2 shows the motor housing 13 and a device for supporting and fixing the mold drive mechanism assembly, which is a side view showing an outline as seen from the direction of arrow AA in FIG. Is. In FIG. 1, reference numeral 1 is a vacuum tank, which is depressurized to a predetermined vacuum degree by a vacuum exhaust device (not shown) and vacuum melted by an induction melting furnace 2 shown in FIG. The centrifugal casting mold 3 is fixed to a rotary table 4, and includes a rotary shaft 5, a bearing 6, a rotary shaft pulley 7, and a motor shaft pulley.
The rotation is given by driving the motor 9 by the reel 7a and the rotation transmission belt 8. Reference numeral 13 stores the motor 9 and the rotary shaft, the rotary shaft of the rotary table 4, the pulley and the belt which are the rotation transmitting means between the rotary shafts, and the internal pressure equal to the atmospheric pressure. It is a storage container, but at least the motor 9
The normal motor can be used without using a special motor such as a vacuum motor just by storing the. An inert gas such as, for example, an inert gas so that the inside pressure of the storage container 13 becomes equal to the atmospheric pressure.
Argon gas or the like may be enclosed, or as shown in FIG. 2, so as to communicate with the atmosphere outside the vacuum tank,
The vacuum tank 1 is passed from the storage container 13 to the vacuum tank 1.
Two seal pipes for intake and exhaust that communicate with the atmosphere outside the room 1
9a and 19b are used for communication, and a coupler 19c
You may make it removable. The motor 9 is a normal motor that can be used in the atmosphere, and the shaft seal 6a seals between the vacuum tank 1 and the motor housing 13 having an internal pressure equal to atmospheric pressure.

Further, the cooling water inlet 11 and the cooling water outlet 11a attached to the motor housing 13 are connected to the outlets and inlets A and C attached to the vacuum tank 1, and then the cooling water is cooled.
Water is passed between the inner and outer walls of the water container 13 to absorb heat generated during operation of the motor 9 and external heat. Outlet of cooling water, inlet 11,1
Couplers 11b and 11c are attached to 1a, respectively, so that the cooling water inlet 11 and the cooling water hose 11d connected to the cooling water outlet 11a can be easily attached and detached. . The motor power supply terminal 10 is
A motor mounted on the inner wall of the vacuum tank 1 is structured so as to seal between the vacuum in the vacuum tank 1 and the enclosed gas 12 in the motor housing 13 which is kept at the same pressure as the atmospheric pressure. Electric power is supplied to the motor 9 from an external power source by a power source plug 10a and a power source cable 10b using a terminal similar to the current terminal B. When the enclosed gas in the motor storage container 13 is the atmosphere, the motor storage container 13 passes through the vacuum chamber and is airtightly communicated with the atmosphere outside the vacuum tank 1, and normally, air is supplied in and out. Air and exhaust seal pipes 19a and 19
b is attached.

Next, the operation of the vacuum induction melting apparatus of the present invention described with reference to FIGS. 1 and 2 will be described. The molten metal melted in the induction melting furnace 2 is poured through the tundish 3a into the centrifugal casting mold 3 which is rotated by the above-mentioned configuration. After the pouring, the inside of the vacuum tank 1 is returned to the atmosphere by an air introduction valve (not shown) to open the door 19 of the vacuum tank 1.
Open, the centrifugal casting apparatus constituted by the members 3 to 13 is placed on the moving carriage 14, and the wheels 15 for moving the carriage are rotated to move the moving carriage 14 to the outside of the vacuum tank 1 to remove the centrifugal casting mold 3 from the product. Take out the casting that is. A device for returning the centrifugal casting mold 3 to the inside of the vacuum tank 1 by the moving carriage 14 after taking out the casting, and supporting the centrifugal casting mold 3.
The centrifugal casting mold 3 is lifted from the moving carriage 14 by the lifting device and the fixing device to release the load on the moving wheels,
The door 19 of the vacuum tank 1 is fixed to the fixed base in the vacuum tank 1.
Then, the inside of the vacuum tank 1 is returned to a vacuum, melting and casting are restarted, and the above-mentioned steps are repeated.

The centrifugal casting apparatus is placed on the moving carriage 14 and moved to the outside of the vacuum tank 1, and the centrifugal casting apparatus after taking out the cast product is returned into the vacuum tank 1 and fixed by an elevating device and a fixing device, or The specific mechanism and operation of releasing the fixation and making it movable will be supplementarily described below with reference to FIG. 3 showing an enlarged main part. First, a support device including a support arm 13a and a lifting screw rod 17 for supporting the centrifugal casting device including the members 3 to 13 so as to be movable up and down with respect to the moving carriage 14 will be described. As shown in FIG. 3 (A), the screw holes 13 of the support arms 13a attached to the left, right, front, and rear four positions of the outer wall of the motor storage container 13 are shown.
An elevating screw rod 17 having a screw head formed as an elevating handle 17c is provided at b with a screw portion 1 cut on its shaft portion.
7a is screwed in and attached, and the screw tip portion 17b is a support arm.
A play that allows relative rotation but only a very short movement in the axial direction with respect to the recess 14b at the upper end of the support column 14a that vertically penetrates the movable carriage 14 and projects downwardly. Are connected with each other. Therefore, the lifting handle 17 is rotated and the screw tip 17
If the protrusion amount of b is increased, the support arm 13a
The distance between the lower surface of the support column 14 and the upper end of the support column 14a is increased, and conversely, if the amount of protrusion is shortened, the interval is reduced, and the entire centrifugal casting apparatus supported by the support arm 13a is lifted from the moving carriage 14 to form a vacuum tank It functions as a jack that moves up and down with respect to one fixed base 1a.

Next, a fixing device for fixing the centrifugal casting device supported by the supporting device in the vacuum tank 1 will be described. As shown in FIG. 3A, the fixing screw hole 1b formed near the inner (left in the figure) end of the fixed base 1a mounted in the vacuum tank 1 has an outer end of the support arm 13a. Through the fixing hole 13c opened nearby, the fixed handle 1
By attaching the handle screw portion 18a of No. 8 and firmly tightening it, the centrifugal casting apparatus constituted by the members of 3 to 13 is lifted from the moving carriage to the pouring position in the vacuum tank 1 while being supported. It is fixed to suppress vibration during operation of the centrifugal casting equipment. For this purpose, the support arm 13a
It is necessary to provide a fixing ring 13e at the upper end of the entrance of the fixing hole 13c and to provide a gap in the recess 14b at the upper end of the support column 14a.

The operation of this fixing device will be described. When melting and centrifugal casting in the vacuum tank 1 are completed and the entire centrifugal casting device is moved to the outside of the vacuum tank 1, as shown in FIG. The fixation by the fixed handle 18 is released. At this time, as shown in FIG. 3 (B), a horseshoe-shaped clasp 18c is sandwiched between the notches 18b provided in the shaft portion of the fixed handle 18 shown in FIG. 3 (A), and the handle 18 slides by its own weight. Hold it in that position to prevent it from falling. The fixed handle 18
May be made removable and may be removed when the centrifugal casting apparatus is moved. In this state, the restraint by the fixed base is released, but the jack function of the support device is achieved by the weight of the movable carriage and the entire centrifugal casting apparatus. Therefore, FIG.
As shown in (C), if the screw handle 17c is extended by the lifting handle 17c and the lower end thereof is brought into contact with the bottom surface of the recess of the support column 14a, the lower surface of the support arm 13a is located above the upper surface of the fixed base 1a. As a result, the weight of the movable carriage and the entire centrifugal casting apparatus is loaded on the movable wheels, and the movable carriage can be moved smoothly. Although not shown, the fixed handle and the lifting handle provided on each of the plurality of support arms may be linked by a sprocket and a chain, respectively. Further, the structure may be simplified, and the movable carriage 14 and the entire centrifugal casting apparatus 3 to 13 may be fixed to the fixed base 1a inside the vacuum tank 1 while being integrally connected.

In this state, the centrifugal casting device and the moving carriage 14
Are a plurality of rows of wheels 1 which are a carriage moving mechanism via rails.
5, the wheels 15 of the carriage moving mechanism are loaded onto the motor 16
It can be easily moved by driving with. When the centrifugal casting device is fixed in the vacuum tank 1, the centrifugal casting device is moved and fixed in the reverse order of the above. The trolley moving mechanism composed of 15 and 16 in the figure uses this vacuum tank to perform vacuum melting, but when gravity casting is performed without centrifugal casting depending on the type of cast product, the trolley has a gravity casting mold. It can also be used when gravity casting is carried out by placing a mold on the mold, and when the mold is moved into and out of the vacuum tank for repairs.

[0013]

1) The rotary shaft of the rotary table and the motor for driving the rotary table are housed in a hermetically sealed motor storage container, and the storage container is provided with respect to the vacuum tank. It is hermetically sealed and is filled with an inert gas such as argon, or is communicated with the atmosphere outside the vacuum tank. Since it can be driven under atmospheric pressure, it is not necessary to use a special motor such as an in-vacuum motor, and a normal motor used in the atmosphere is used as a rotary drive source, and the vacuum of a centrifugal casting apparatus is used. It is effective to install in the tank. 2) The vacuum casting mold, the rotary table, the rotary shaft of the rotary table and the drive motor are integrally mounted on a trolley to move between the inside and the outside of the vacuum tank, and centrifugal centrifugal casting. Since the entire casting device can be left on the moving carriage, or the entire centrifugal casting device can be separated from the moving carriage and jacked up, it can be fixed to the fixed base in the vacuum tank.
Various operations can be facilitated because it is possible to take out cast products, which are products, and to attach and detach centrifugal casting molds for maintenance of centrifugal casting equipment outside the vacuum tank. 3) By using a moving method using a dolly, the same dolly can be used for casting other than centrifugal casting such as gravity casting, and operations such as moving the mold, attaching and detaching the mold can be facilitated.

[Brief description of drawings]

FIG. 1 is a schematic front view showing the arrangement in a vacuum tank of an embodiment of the in-vacuum centrifugal casting apparatus of the present invention.

FIG. 2 is a side view showing a support, an elevating device and a fixing device of the centrifugal casting apparatus as seen from the direction of arrow AA in FIG.

3A and 3B are partially enlarged side views of essential parts of the supporting, elevating, and fixing device shown in FIG. 2, in which FIG. 3A shows a fixed state, and FIG. 3B shows a released state. (C) shows a state in which the support arm of the centrifugal casting apparatus is further separated slightly above the fixed base.

FIG. 4 is a schematic front view showing an arrangement in a vacuum tank of a conventional vacuum melting / centrifugal casting apparatus.

[Explanation of symbols]

1 vacuum tank 1a Fixed base 1b Fixing screw part 2 induction melting furnace 3 Centrifugal casting mold 3a tundish 4 rotation table 5 rotation axes 6a shaft seal 9 motors 10a power plug 11, 11a Cooling water inlet and outlet 12 Gas enclosed in the motor storage container 13 motor storage container 13a Support arm 13b Support arm screw part 14 Mobile trolley 14a Support pillar 15 trolley movement mechanism wheels 17 Lifting handle 18 fixed handle 18a Fixed handle screw part 19 Vacuum tank door 19a, 19b Seal piping for air supply and exhaust

Claims (7)

[Claims] 1. A vacuum tank, a melting furnace housed in the vacuum tank, and a removably mounted on a rotary table housed in the vacuum tank, which rotates integrally with the rotary table. Mold including a centrifugal casting mold, a drive motor for rotating the rotary table and its rotary shaft, the rotary table and its rotary shaft, a connecting mechanism between the two rotary shafts, and the like. And a mold drive mechanism assembly, and a moving device for placing a centrifugally cast mold that has finished casting and moving it to the outside of the vacuum tank and returning it to the vacuum tank for casting. At least the drive motor in the mechanism assembly is housed in a hermetically sealed container, and air near atmospheric pressure or a gas such as an inert gas is enclosed in the container. In-vacuum centrifugal casting equipment. 2. A vacuum tank, a melting furnace housed in the vacuum tank, and a detachable mount on a rotary table housed in the vacuum tank to rotate integrally with the rotary table. Mold including a centrifugal casting mold, a drive motor for rotating the rotary table and its rotary shaft, the rotary table and its rotary shaft, a connecting mechanism between the two rotary shafts, and the like. And a mold drive mechanism assembly, and a moving device for placing the centrifugally cast mold that has finished casting, moving it to the outside of the vacuum tank, and returning it to the vacuum tank for casting. It is detachably connected to the mold drive mechanism assembly, placed on the moving device in a connected and integrated state, moved to the outside of the vacuum tank after the casting is completed, and a vacuum is applied when the casting is restarted. Moved into the tank and before The centrifugal casting apparatus in vacuum, which is placed on the moving device or separated from the moving device and returned to the casting position. 3. The vacuum centrifugal casting apparatus according to claim 1, wherein the mold and the mold driving mechanism assembly are integrally mounted on the moving device, and when the casting is completed, the vacuum tank It is moved to the outside and moved to a vacuum tank when the casting is restarted, and is kept on the moving device or is separated from the moving device and returned to the casting position. Vacuum centrifugal casting equipment. 4. The vacuum centrifugal casting apparatus according to claim 1, wherein the gas enclosed in the container is the atmosphere, and the inside of the container is the atmosphere outside the vacuum tank through a seal pipe. In-vacuum centrifugal casting equipment that is in communication with. 5. The in-vacuum centrifugal casting apparatus according to claim 4, wherein the seal pipe is composed of two flow paths through which the atmospheric air flows in and out. 6. The in-vacuum centrifugal casting apparatus according to claim 2 or 3, wherein the in-vacuum centrifugal casting apparatus further separates the mold and the mold driving mechanism assembly from a moving device and fixes the vacuum tank. A fixing device that is detachably fixed to the member and the mold and the mold drive mechanism assembly that are in a state of being released from the fixation with the fixing member are moved up and down with respect to the moving device to load or load the moving device. An elevating device for releasing the above, and a centrifugal casting apparatus in vacuum. 7. The in-vacuum centrifugal casting apparatus according to claim 2 or 3, wherein the in-vacuum centrifugal casting apparatus further includes the mold, the mold driving mechanism assembly, and the moving device that are integrally connected. In this state, the fixing device for removably fixing to the fixing member of the vacuum tank, the mold, the mold driving mechanism assembly and the moving device which are released from the fixing with the fixing member are integrally connected. An in-vacuum centrifugal casting apparatus comprising: an elevating device that is moved up and down as it is to load or unload the fixing device.