JP2006035240A - Casting apparatus having automatic temperature rising function - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To shorten a cycle time in a flapping process by proportioning to the temperature-lowered value. <P>SOLUTION: A casting apparatus is composed of a lower mold 2 loaded on a base 6 and fixed to a position of this base 6, an upper mold 1 arranged so as to shift to the vertical direction and move as turning-over under state of shifting to the upper part on the lower mold 2, and side molds 3 set as four divided state surrounding to the upper mold 1 and arranged so as to be slidingly shifted to the side direction. Thermal sensors 7 are arranged at back sides of the side molds 3 and based on signal from the side mold 3, a controlling member 7 for performing the cycle time control, etc., in the flapping process for promoting the temperature-rising around the side mold 3 is arranged. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an aluminum alloy wheel casting apparatus, and in particular, when the temperature around the mold is lowered in the casting process, the temperature around the mold is automatically increased to a predetermined value. The present invention relates to a casting apparatus having an automatic temperature raising function around a mold.

In general, as a casting apparatus for various products such as aluminum alloy wheels, for example, one described in Japanese Patent Publication No. 7-12538 can be cited. And this thing is formed with each metal mold | die which consists of an upper metal mold, a lower metal mold, a horizontal metal mold, etc., These predetermined molds are formed when each metal mold is closed A casting having a predetermined form is formed by injecting molten aluminum alloy into the space. In this way, after a product having a predetermined form is formed, each mold is opened, and the periphery of each opened mold is cleaned by high-pressure air blow etc. The mold is closed and a new casting process is advanced. By repeatedly performing such a series of steps, the casting step of the aluminum alloy wheel is continuously advanced.
Japanese Examined Patent Publication No. 7-12538

  By the way, in a series of processes in the above-mentioned conventional one, the temperature around the mold may be abnormally lowered. If the casting process proceeds in such a state that the temperature around the mold is lowered in this way, there is a possibility that a shrinkage or the like may be generated inside the product. In order to prevent such problems such as the formation of burrows, conventionally, when the temperature around the mold is lowered, as a recovery work, cooling from injection of molten metal into the cavity space is performed. The time (cycle time) until the mold is opened after the process is shortened. In this way, the temperature rise around the mold is promoted. That is, the time from the pouring of the molten metal to the opening of the mold is consciously shortened by the judgment of the operator, and the temperature rise around the mold is promoted. Such an operation (process) is referred to as a tilt process. However, this tilting process is performed based on the operator's intuition and experience. Therefore, the time required for the tilting process, that is, the time for raising the temperature around the mold to a predetermined temperature varies greatly depending on the ability of the operator. Further, in some cases, there is a problem that the casting process is restarted even though the temperature has not been sufficiently increased, and as a result, shrinkage or the like is caused in the product. In order to solve such problems caused by the skill of the operator, an automatic temperature raising function is provided so that the tilting process can be automatically controlled based on a preset program. An object (problem) of the present invention is to provide a casting apparatus.

  In order to solve the above problems, the following measures are taken in the present invention. That is, in the first invention according to the first aspect of the present invention, it is composed of a plurality of molds of an upper mold, a lower mold, and a horizontal mold, and includes a mold closing process, a tilting and pouring process. With respect to a casting apparatus having a series of processes such as a cooling process, a mold opening process, a product removal / cleaning process, a temperature sensor is provided at the back side of the cavity space forming surface of the horizontal mold, and Based on the signal, when it is determined that the temperature around the horizontal mold is below a predetermined value, the time from the cooling process to the mold opening process is shortened, and the series of processes is performed within a short time. It was decided to adopt a configuration in which the operation was repeated.

  Further, in a second invention which is the invention according to claim 2, in the casting apparatus having the automatic temperature raising function according to claim 1, when the temperature around the horizontal mold becomes a predetermined value or less, The time from the cooling process to the mold opening process was shortened in proportion to the temperature drop value. According to a third aspect of the present invention, a control device comprising a computer device is provided for the casting device having the automatic temperature raising function according to the first aspect, and the cooling device is provided in the computer device. It was decided to adopt a configuration in which a program that shortens the time from the process to the mold opening process in a state proportional to the temperature drop value was set in advance.

  According to the first invention, the time from the cooling process to the mold opening process is automatically shortened, and the temperature raising work around the horizontal mold is efficiently performed regardless of the skill of the operator. It will be advanced. As a result, it is possible to improve the efficiency of the casting operation and thus improve the productivity.

  Further, according to the second invention, since the temperature raising step is proportional to the temperature drop value from a preset temperature, the required time from the cooling step to the mold opening step is shortened. As the temperature around the horizontal mold is lower, the mold opening timing is made earlier, and the injection frequency of the molten metal into the cavity space is increased, so that the temperature rise around the horizontal mold can be promoted. Become. As a result, the temperature rise around the horizontal mold can be efficiently performed, and the temperature raising process, that is, the tilting process can be shortened. As a result, the restart of the casting process can be promoted, and as a result, productivity can be improved.

  According to the third aspect of the invention, the temperature rise work around the mold, particularly the horizontal mold, is performed by automatically shortening the time until mold opening by a control action based on a preset program or the like. It comes to be. As a result, regardless of the skill of the operator, the temperature raising work around the horizontal mold can be carried out most efficiently, so that the casting work can be made more efficient and the productivity can be improved. Become.

  The best mode for carrying out the present invention will be described with reference to FIGS. As shown in FIG. 1, the embodiment of the present invention is mounted on a base 6 and fixed on the base 6, and on the lower mold 2. The upper mold 1 provided so as to perform a reversing movement in the state of moving in the vertical direction and moving upward, and installed in a state of being divided into four around the upper mold 1 The present invention relates to an aluminum alloy wheel casting apparatus comprising a horizontal mold 3 provided so as to be slidable in a direction. In the structure having such a configuration, the ladle 4 provided in a part of the horizontal mold 3 is tilted by a predetermined angle after the molds 1, 2, and 3 are closed. In this state, the molten metal poured into the ladle 4 is rotated by rotating the entire casting apparatus at a predetermined speed. The aluminum alloy wheel is finally cast into the cavity space formed by the above process.

  In such a configuration, a plurality of air blow nozzles 15 are provided on the surface side forming the cavity space on the lower surface side of the upper mold 1 as shown in FIG. . And from this air blow nozzle 15, predetermined high pressure air is jetted suitably. The injection of high-pressure air from these air blow nozzles 15 is controlled based on a control command (signal) from a separately provided control means 5. A plurality of air blow nozzles 66 are provided at the base 6 on which the lower mold 2 is mounted as shown in FIG. The high-pressure air injection timing from the air blow nozzle 66 is also based on a control command (signal) from the control means 5.

  In such a configuration, a temperature sensor 7 is provided on the back side of the cavity space forming surface of the horizontal mold 3. An appropriate temperature in the cavity space is detected by a signal from a temperature sensor 7 provided on the back side of the horizontal mold 3.

  Based on the signal from the temperature sensor 7 having the above structure, the control means 5 controls the operation of the tilting process for promoting the temperature rise around the horizontal mold 3 described later, and controls the operation of each process. Is composed of a computer device mainly formed with a microprocessor unit (MPU), which performs various arithmetic processes and performs various controls based on the results of the arithmetic processes. is there. In the computer device, a program for determining the timing of mold opening is set in advance.

  Next, a casting process in the present casting apparatus having such a configuration will be described with reference to FIG. That is, in the casting process, first, as shown in FIG. 2A, when the molds 1, 2, and 3 are closed in the mold closing process, they are rotated by a predetermined angle. 2 is installed in the state shown in FIG. Next, in such a state, a molten metal made of an aluminum alloy is poured into the ladle 4, and in this state, the entire mold closed is rotated. That is, by adopting the tilting and pouring process as shown in FIG. 2C, the molten aluminum alloy is injected into the cavity space formed by the molds 1, 2, and 3. The Rukoto.

  And in such a state, as shown to (D) of FIG. 2, a cooling process will be taken continuously. In this cooling process, a predetermined coolant is introduced into each of the molds 1, 2, 3 via the coolant introduction path 8 shown in FIG. 1 and further via a valve 88 provided in the middle of the coolant introduction path 8. It is to be done by being done. The opening / closing operation of the valve 88 for restricting the introduction of the coolant and the introduction time of the coolant are performed based on a command from the control means 5. Then, after the cooling process (D) for a predetermined time has elapsed, the mold opening process shown in (E) of FIG. 2 is started. The time from the start of the cooling process (D) to the mold opening process (E) is based on a control command (signal) from the control means 5 and a program incorporated in advance in the computer device forming the control means 5 Is to be performed on the basis of In particular, in this case, the control action by the control means 5 is performed based on a command (signal) from the temperature sensor 7 provided on the back side of the cavity space forming surface of the horizontal mold 3 shown in FIG. It is what.

  Next, in this state, as shown in FIG. 2 (F), the product is taken out, and subsequently, as shown in FIG. 2 (G), cleaning around the molds 1, 2, and 3 is performed. Work is done. Further, as shown in FIG. 2A, a mold closing step is taken and the original state is restored. In this way, the casting operation of the aluminum alloy wheel is continuously advanced by the progress of a series of steps.

  In such a series of steps, when it is determined that the information from the temperature sensor 7 provided on the back side of the horizontal mold 3 shown in FIG. 1 is lower (low temperature) than a preset value. The time from the cooling step (D) to the mold opening step (E) (referred to as cycle time) t is shortened. That is, the time from the molten metal injection (B) to the mold opening (D) and product removal (F) is shortened, and a new pouring process (B, C) is performed before the temperatures of the molds 1, 2, 3 are lowered. To quickly increase the temperature around each of the molds 1, 2, and 3 to an appropriate value. That is, the tilting process is introduced to keep the temperature around the molds 1, 2, and 3 at an appropriate temperature, and to prevent the occurrence of shrinkage or the like inside the casting product.

  With respect to this tilting process, in this embodiment, as shown in FIG. 3, the cycle time (t) is shortened in proportion to the rate of temperature decrease. An embodiment relating to the reduction of the cycle time (t) will be described. Specifically, when the series of casting steps proceeds with the cycle time (t) set to a value of 2 minutes, the temperature around the horizontal mold 3 shows a value of 480 ° C., In this state, no shrinkage or the like occurs in the cast product. However, as a rule of thumb until now, it has been found that if the temperature around the horizontal mold 3 is lowered to 400 ° C. or lower during the series of casting processes, there is a possibility that a shrinkage or the like may occur inside the casting product. Yes. In order to cope with this, conventionally, an operator performs the above tilting process based on his / her own experience and the like. In the present embodiment, such a tilting process is performed by preset program control.

  As a specific example, as shown in FIG. 3, it was determined that the temperature around the horizontal mold 3 dropped to 400 ° C. based on information from the temperature sensor 7 installed on the back side of the horizontal mold 3. Sometimes, the value of the cycle time (t) is shortened to 1 minute 30 seconds. And until the temperature around the horizontal mold 3 reaches 480 ° C., the cycle time (t) is increased according to the temperature rise, and when the temperature reaches 480 ° C., the cycle time (t) is Change to a normal value of 2 minutes. That is, the value of the cycle time (t) is automatically changed in a proportional state in correspondence with the temperature change value around the horizontal mold 3. Such a control program is incorporated in a computer device forming the control means 5. In addition to the above, each set value (see FIG. 3) set in the program includes, for example, a minimum mold opening limit time of about 1 minute 25 seconds, and a cycle time ( In some cases, t) is set to about 1 minute 50 seconds, the absolute defective temperature 400 ° C. is set to 420 ° C., and the stable lower limit temperature 480 ° C. is set to about 470 ° C.

  By automatically performing the tilting process on the basis of the program previously incorporated in the control means 5, the tilting process can be most efficiently advanced regardless of the skill of the operator. . As a result, the temperatures of the molds 1, 2, and 3 can be automatically maintained in an optimum state, and the efficiency of the entire casting process can be improved, and thus the productivity can be improved. .

It is sectional drawing which shows the whole structure of this invention. It is process explanatory drawing which shows the whole casting process concerning this invention. It is a figure (graph) which shows the control aspect of the tilting process concerning this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Upper die 15 Air blow nozzle 2 Lower die 3 Horizontal die 4 Ladle 5 Control means 6 Base 66 Air blow nozzle 7 Temperature sensor 8 Coolant introduction path 88 Valve

Claims (3)

  It consists of a plurality of molds, an upper mold, a lower mold, and a horizontal mold, and includes a series of processes such as a mold closing process, a tilting / pouring process, a cooling process, a mold opening process, a product removal / cleaning process, etc. In the casting apparatus having a process, a temperature sensor is provided on the back side of the cavity space forming surface of the horizontal mold, and the temperature around the horizontal mold is a value equal to or lower than a predetermined value based on a signal from the temperature sensor. An automatic temperature rise function characterized in that the time from the cooling step to the mold opening step is shortened and the series of steps is repeated in a short time. Having casting equipment.   2. A casting apparatus having an automatic temperature raising function according to claim 1, wherein when the temperature around the horizontal die becomes a predetermined value or less, the time from the cooling step to the mold opening step is proportional to the temperature drop value. A casting apparatus having an automatic temperature raising function, characterized in that it is shortened by the above.   2. A casting apparatus having an automatic temperature raising function according to claim 1, wherein a control means comprising a computer device is provided, and the time from the cooling step to the mold opening step is proportional to the temperature drop value in the computer device. A casting apparatus having an automatic temperature raising function, wherein a program to be shortened is set in advance.

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