JP4760042B2 - Gravity casting method and apparatus - Google Patents

Description

  The present invention relates to a gravity casting method and apparatus, and more particularly, to a gravity casting method and apparatus for controlling the molten metal temperature in a hopper poured into a casting frame to an optimum inflow temperature and pouring into the casting frame. Is.

  In the conventional gravity casting method, as shown in FIG. 7A, a gypsum mold 2 and a hopper 3 for a hot water reservoir are set on a split casting frame 1 and are made of metal (aluminum or the like) housed in a hot water furnace 4. ) Is supplied to the hopper 3 via the hot water supply tray 5 as shown in FIG. 7C and 7D, the casting frame 1 is tilted by 90 ° together with the hopper 3, and the molten metal W in the hopper 3 is poured into the casting frame 1.

  Thereafter, after the molten metal W in the casting frame 1 is solidified, the casting frame 1 is divided, the casting Wz is released from the casting frame 1 and taken out, and the casting operation is completed (see, for example, Patent Document 1). ).

  By the way, in the conventional gravity casting method as described above, when pouring the molten metal W stored in the hot water supply furnace 4 into the casting frame 1 at a predetermined temperature (for example, around 700 ° C. in the case of aluminum), the time until pouring is performed. However, when the hot water is supplied to the casting frame 1, there is a problem that the molten metal W falls below the inflow set temperature (around 650 ° C.) and causes a filling failure when flowing into the casting frame 1.

  In view of this, the temperature of the molten metal W is expected to decrease during the time from the hot water supply furnace 4 to the casting frame 1, and the set temperature of the molten metal W previously stored in the hot water supply furnace 4 is increased by a temperature corresponding to the temperature decrease. It is also conceivable that the molten metal temperature is optimal when poured into the casting frame 1.

  However, if the set temperature of the molten metal W in the hot water furnace 4 is set higher than the pouring temperature and supplied to the hopper 3, the molten metal temperature in the hopper 3 also rises and flows into the casting frame 1 until it falls to the optimum inflow temperature. Therefore, there is a problem that it is difficult to improve the efficiency of the casting operation.

In addition, when it takes time to pour the molten metal W of the hot water furnace 4 into the casting frame 1, the molten metal temperature in the hopper 3 becomes lower than the set temperature as described above, causing a casting defect. In such a case, it was necessary to raise the molten metal temperature to the set temperature again.
JP-A-6-114535

  This invention pays attention to such conventional problems, and when pouring the molten metal supplied from the hot water furnace into the casting frame, it is always adjusted to the optimum molten metal temperature, thereby shortening the casting operation time and casting product defects. It is an object of the present invention to provide a gravity casting method and apparatus capable of effectively preventing the above.

In order to achieve the above object, according to the present invention, the gravity casting method of the present invention always detects the molten metal temperature with a temperature sensor provided in the hopper when the molten metal is poured into the casting frame from the hopper. If the detected molten metal temperature is higher or lower than the set temperature, a plurality of metal bars or metal plates, or metal bars or metal plates through which a refrigerant flows are implanted on the plate, and this plate is Optimal by cooling or keeping the temperature of the molten metal by using a temperature adjusting means configured to move the metal rod or metal plate into and out of the molten metal in the hopper by moving it with a cylinder. adjusted until Do inlet temperature, by tilting the casting frame with hopper when the molten metal temperature reaches the optimal inlet temperature in the hopper, soluble in the hopper It is an gist pouring the casting frame within.

  Here, the temperature sensor, the hopper and the tilting device of the casting frame are linked to perform pouring of the molten metal, and the temperature adjusting means enables the molten metal in the hopper to be taken in and out for a predetermined time.

Further, the gravity casting apparatus of the present invention is provided with a temperature adjusting means capable of keeping in and out of the molten metal in the hopper at a predetermined temperature, and a temperature sensor for detecting the molten metal temperature in the hopper. adjusting means double the number metal rods alone or a metal plate alone on the plate, or implanted metal rods or metal plates to flow of refrigerant, the plate is moved by a cylinder metal bar or a metal plate in the hopper The temperature sensor is connected to a control device that controls tilting of the hopper and the casting frame tilting device.

  Here, the temperature adjusting means is configured to plant a plurality of metal rods or metal plates alone or a metal rod or metal plate through which a coolant flows, and move the plate by a cylinder. A metal rod or metal plate is put in and out of the molten metal in the hopper, and the temperature adjusting means is provided with a heating means for a plurality of metal rods or metal plates implanted on the plate, and the plate is moved by a cylinder. Thus, the metal rod or the metal plate is taken in and out of the molten metal in the hopper.

  The tilting device is composed of a tilting cylinder and a hydraulic unit operated by a control signal from the control device, and the volume of the temperature adjusting means is set to 0.1 to 10% with respect to the molten metal volume in the hopper. To do.

  In the present invention, when the molten metal supplied from the hot water furnace is poured into the casting frame, the molten metal is always adjusted to the optimum molten metal temperature, so that the casting operation time can be shortened and casting defects can be effectively prevented. Is.

In the hopper, as described above, a temperature adjusting means capable of keeping in and out of the molten metal in the hopper at a predetermined temperature or a temperature sensor for detecting the molten metal temperature in the hopper is provided, and the temperature adjusting means is double the number metal rods alone or a metal plate alone on the plate, or implanted a metal bar or a metal plate to refrigerant flow, the molten metal of the plate is moved by the cylinder in the hopper a metal bar or a metal plate The temperature sensor is connected to a control device that controls tilting of the hopper and casting frame tilting device, so that the casting work time can be shortened and defective castings can be effectively prevented. There is an effect that can be done.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Note that the same components as those in the conventional example are denoted by the same reference numerals and description thereof is omitted.

FIG. 1 shows a schematic configuration diagram of a gravity casting apparatus for carrying out the gravity casting method of the present invention, and this gravity casting apparatus accommodates a metal melt at a predetermined temperature as shown in FIG. 7 (b). A hot water furnace 4 to be divided, a split-type casting frame 1, a hopper 3 provided at a side of a hot water inlet of the casting frame 1, and a hot water tray 5 into which the molten metal W of the hot water furnace 4 flows into the hopper 3. The casting frame 1 is tilted together with the hopper 3 via a tilting device 9 (tilting means 9), and the molten metal W in the hopper 3 is poured into the casting frame 1.
In the gravity casting apparatus, a split casting frame 1 and a hopper 3 for hot water storage are installed on a support plate 6, and the molten metal temperature in the hopper 3 is kept at a predetermined temperature in the hopper 3. A temperature adjusting means 7 that can be taken in and out and a temperature sensor 8 that detects the temperature of the molten metal in the hopper 3 are provided. The tilting device 9 is connected to a control device 10 that controls tilting.

  As shown in FIGS. 2 to 4, the temperature adjusting means 7 has a plurality of round metal rods 12 or a plate metal plate 13 implanted on the plate 11, or as shown in FIG. It is also possible to plant a metal rod 12a (or a metal plate) through which the refrigerant Q circulates on the plate 11 and provide heating means such as a heater instead of the refrigerant.

  As shown in FIG. 1, such temperature adjusting means 7 is suspended on a hopper 3 via a cylinder 14, and the metal rods 12, 12 a or the metal plate 13 are moved into the molten metal in the hopper 3 by the expansion and contraction operation of the cylinder 14. It is configured to enter and exit W.

  Further, the volume of the temperature adjusting means 7 is preferably set to 0.1 to 10% with respect to the molten metal volume in the hopper 3. For example, when the molten metal in the hopper 3 is cooled, the temperature adjusting means 7. If the volume of the steel is less than 0.1%, the cooling efficiency is poor, and if it exceeds 10%, the cooling efficiency is too fast, and the molten metal W in the hopper 3 may fall below the set inlet temperature in a short time. .

  The tilting device 9 is composed of a tilting cylinder 15 and a hydraulic unit 16 that are actuated by a control signal from a control device 10 connected to the temperature sensor 8, and the tip of the rod 15 a of the tilting cylinder 15 is located below the hopper 3. The support plate 6, which is connected to the bottom surface of the support plate 6 by a connection fitting or the like and has the casting frame 1 and the hopper 3 installed by the expansion and contraction operation of the rod 15 a of the tilting cylinder 15, can turn 90 degrees clockwise around the fulcrum 17. It has become.

  The cylinder 14 of the temperature adjusting means 7 is connected to the hydraulic unit 16 of the tilting device 9, and the hydraulic unit 16 is driven by the control signal from the control device 10 connected to the temperature sensor 8 to supply the hydraulic oil to the cylinder 14. It is configured to supply or discharge.

Next, the gravity casting method of the present invention will be described based on the above configuration.
In this invention, as shown in FIG. 1 and FIGS. 6A to 6D, the molten metal W supplied to the hopper 3 through the hot water tray 5 with the molten metal W stored in the hot water supply furnace 4 is supplied to the hopper 3. The temperature sensor 8 provided in the inside always detects the molten metal temperature.

  When the temperature of the molten metal W supplied to the hopper 3 is higher than the set temperature, the metal rods 12 and 12a or the metal plate 13 of the temperature adjusting means 7 are immersed in the molten metal W in the hopper 3 as described above. Adjust until the proper inflow temperature is reached.

  Specifically, the metal rods 12 and 12a or the metal plate 13 of the temperature adjusting means 7 are hopper-operated by driving the hydraulic unit 16 of the control device 9 and extending the cylinder 14 based on the detected temperature signal from the temperature sensor 8. The temperature is adjusted while being immersed in the molten metal W in 3.

  On the other hand, when the temperature of the molten metal W supplied to the hopper 3 is lower than the set temperature, the metal rods 12 and 12a or the metal plate 13 provided with the heating means of the temperature adjusting means 7 are placed in the hopper 3 as described above. The molten metal W is soaked in the molten metal W and adjusted until the molten metal W is raised to the optimum inflow temperature, and when the molten metal W in the hopper 3 reaches the optimum inflow temperature, the temperature adjusting means 7 is extracted from the hopper 3. Is.

  In this way, while the temperature of the molten metal in the hopper 3 is detected by the temperature sensor 8, the temperature adjusting means 7 cools or keeps the temperature, and when the molten metal temperature in the hopper 3 reaches the optimum inflow temperature, the temperature sensor 8 An operation signal is output to the control device 9, and the support plate 6 on which the casting frame 1 and the hopper 3 are installed via the hydraulic unit 16 and the tilting cylinder 15 is rotated 90 degrees clockwise around the fulcrum 17, thereby The molten metal W in 3 is sequentially poured into the casting frame 1 to perform the casting operation. In addition, since it is the same as that of a conventional example after completion of the casting operation, the description thereof is omitted.

  As described above, according to the present invention, when the molten metal W supplied from the hot water furnace 4 is poured into the casting frame 1, the casting temperature is always adjusted to the optimum molten metal temperature, thereby reducing the casting operation time and casting defects. Can be effectively prevented.

It is a schematic block diagram of the gravity casting apparatus for enforcing the gravity casting method of this invention. It is a perspective view which shows 1st Embodiment of a temperature adjustment means. It is a perspective view which shows 2nd Embodiment of a temperature adjustment means. It is a perspective view which shows 3rd Embodiment of a temperature adjustment means. It is a perspective view which shows 4th Embodiment of a temperature adjustment means. (A)-(d) is explanatory drawing of the process of pouring the molten metal in the hopper of this invention into a casting frame one by one, and performing a casting operation. (A)-(e) is explanatory drawing of the process of the casting operation | work which pours the molten metal supplied from the hot water furnace in the conventional gravity casting method into a casting frame via a hopper.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Casting frame 2 Gypsum mold 3 Hopper 4 Hot-water supply furnace 5 Hot-water supply tray W Molten metal 6 Support plate 7 Temperature adjustment means 8 Temperature sensor 9 Tilt device 10 Control apparatus 11 Plate 12, 12a Metal rod 13 Metal plate 14 Cylinder 15 Tilt cylinder 15a Rod 16 Support plate 17 fulcrum

Claims (7)

From a hot water furnace for storing a molten metal made of metal at a predetermined temperature, a split-type casting frame, a hopper provided on the side of the hot water outlet of the casting frame, and a hot water tray for pouring the molten metal of the hot water furnace into the hopper In the gravity casting method, a molten metal made of metal set to a predetermined temperature is supplied to the hopper from the hot water furnace through a hot water tray, and the casting frame is tilted together with the hopper, and the molten metal in the hopper is poured into the casting frame. ,
When the molten metal is poured into the casting frame from the hopper, the molten metal temperature is always detected by a temperature sensor provided in the hopper, and the molten metal temperature detected by the temperature sensor is higher or lower than the set temperature. In addition, a plurality of metal bars or metal plates alone, or metal bars or metal plates through which a refrigerant flows are placed on the plate, and this plate is moved by a cylinder so that the metal bars or metal plates are put into and out of the molten metal in the hopper. The temperature of the metal rod or metal plate is taken in and out of the molten metal using a temperature adjusting means configured to adjust the molten metal temperature to the optimum inflow temperature by cooling or keeping the molten metal, and the molten metal temperature in the hopper is optimal. A gravity casting method, wherein the casting frame is tilted together with the hopper when the inflow temperature is reached, and the molten metal in the hopper is poured into the casting frame.   The gravity casting method according to claim 1, wherein the molten metal is poured by interlocking the temperature sensor, a hopper, and a casting frame tilting device.   3. The gravity casting method according to claim 1, wherein the temperature adjusting means allows the molten metal in the hopper to be taken in and out for a predetermined time. From a hot water furnace for storing a molten metal made of metal at a predetermined temperature, a split-type casting frame, a hopper provided on the side of the hot water outlet of the casting frame, and a hot water tray for pouring the molten metal of the hot water furnace into the hopper In the gravity casting apparatus that tilts the casting frame together with the hopper through the tilting means and flows the molten metal in the hopper into the casting frame,
In the hopper, and a temperature sensor for detecting the molten metal temperature in the out possible temperature adjusting means and the hopper for warmth or cooling the molten metal temperature in the hopper at a predetermined temperature is provided, said temperature adjusting means, several on a plate A single metal rod or metal plate of a book, or a metal rod or metal plate through which a refrigerant flows is implanted, and the plate is moved by a cylinder so that the metal rod or metal plate is taken in and out of the molten metal in the hopper. A gravity casting apparatus, wherein the temperature sensor is connected to a control device that controls tilting of the tilting device of the hopper and the casting frame.   The temperature adjusting means is provided with heating means for a plurality of metal bars or metal plates implanted on the plate, and the plate is moved by a cylinder so that the metal bars or metal plates are taken in and out of the molten metal in the hopper. The gravity casting apparatus according to claim 4.   The gravity casting apparatus according to claim 4 or 5, wherein the tilting device includes a tilting cylinder and a hydraulic unit that are operated by a control signal from a control device.   The gravity casting apparatus according to claim 4, 5 or 6, wherein a volume of the temperature adjusting means is set to 0.1 to 10% with respect to a molten metal volume in the hopper.

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