Control system, control method, and control program

Abstract

This disclosure provides a control system, control method, and control program that can suppress the accumulation of flammable gas in a mold. [Solution] The control system according to this disclosure is a control system for a mold 20 that raises the temperature by burning a supplied combustible gas, and controls the amount of combustible gas supplied to the mold 20 based on the amount of unburned combustible gas in the mold 20.

Description

Technical Field

[0001] The present disclosure relates to a control system, a control method, and a control program.

Background Art

[0002] Patent Document 1 discloses a core mold heating control device capable of reducing temperature unevenness in a mold.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the core mold heating control device disclosed in Patent Document 1 described above, even if the temperature of the mold is controlled to an appropriate temperature, there may be a case where the combustible gas supplied to the mold is excessively supplied and stays.

[0005] The present disclosure has been made in view of such circumstances, and provides a control system, a control method, and a control program capable of suppressing the retention of combustible gas in a mold.

Means for Solving the Problems

[0006] The control system according to the present disclosure is a control system for a mold that raises the temperature by burning the supplied combustible gas, and controls the supply amount of the combustible gas supplied to the mold based on the unburned amount of the combustible gas in the mold.

[0007] The control system described herein controls the amount of combustible gas supplied to the mold based on the amount of unburned combustible gas in the mold. This configuration prevents the combustible gas from being supplied in excess to the mold and accumulating inside the mold.

[0008] The system further comprises a combustion device that supplies the combustible gas to the mold and burns the combustible gas, and a sensor positioned below the combustion device in the mold for measuring the amount of unburned combustible gas in the mold, wherein the sensor measures the amount of combustible gas diffused downward from the combustion device as the amount of unburned combustible gas in the mold. With this configuration, the sensor can measure the amount of combustible gas diffused downward from the combustion device as the amount of unburned combustible gas in the mold, thereby enabling more reliable control of the amount of combustible gas supplied to the mold.

[0009] The aforementioned flammable gas is hydrogen gas. By using this configuration, even when hydrogen gas is used as the flammable gas, the accumulation of hydrogen gas inside the mold can be suppressed, thereby enhancing safety.

[0010] The control method relating to this disclosure is: A method for controlling a mold that raises the temperature by burning a supplied combustible gas, A computer performs a process to control the amount of combustible gas supplied to the mold based on the amount of unburned combustible gas in the mold.

[0011] The control method described herein controls the amount of combustible gas supplied to the mold based on the amount of unburned combustible gas in the mold. This configuration prevents the combustible gas from being excessively supplied to the mold and accumulating inside it.

[0012] The control program relating to this disclosure is A mold control program that raises the temperature by burning the supplied combustible gas, The computer is instructed to perform a process that controls the amount of combustible gas supplied to the mold based on the amount of unburned combustible gas in the mold.

[0013] The control program described herein controls the amount of combustible gas supplied to the mold based on the amount of unburned combustible gas in the mold. This configuration prevents the combustible gas from being supplied in excess to the mold and accumulating inside the mold. [Effects of the Invention]

[0014] This disclosure provides a control system, control method, and control program that can suppress the accumulation of flammable gas in a mold. [Brief explanation of the drawing]

[0015] [Figure 1] This is a block diagram showing the configuration of the control system according to Embodiment 1. [Figure 2] This is a cross-sectional view of the mold. [Figure 3] This is a flowchart illustrating the control method according to Embodiment 1. [Modes for carrying out the invention]

[0016] The present disclosure will be described below through embodiments of the invention, but the invention claimed is not limited to the following embodiments. Furthermore, not all of the configurations described in the embodiments are necessarily essential for solving the problem. For clarity of explanation, the following descriptions and drawings have been omitted and simplified as appropriate. In each drawing, the same elements are denoted by the same reference numerals, and redundant explanations have been omitted where necessary.

[0017] It should be noted that the right-handed xyz Cartesian coordinate system shown in the diagram is merely a convenient representation for explaining the positional relationships of the components. Typically, the positive z-axis is vertically upward, and the xy-plane is horizontal.

[0018] (Embodiment 1) <Control System> First, referring to FIGS. 1 and 2, the control system according to Embodiment 1 will be described. FIG. 1 is a block diagram showing the configuration of the control system according to Embodiment 1. FIG. 2 is a cross-sectional view of the mold.

[0019] As shown in FIG. 1, the control system 1 includes a control device 10 and a mold 20. In FIG. 1, the control device 10 is provided outside the mold 20, but it is not limited thereto, and it may be configured to be provided inside the mold 20. Hereinafter, the mold 20 and the control device 10 will be described in this order.

[0020] <Mold> As shown in FIG. 2, the mold 20 includes a pair of mold halves 31 and 32 that can be opened and closed. By closing the pair of movable mold halves 31 and 32 and filling the space (cavity) 33 formed inside with a filler (not shown), such as kneaded sand or molten metal, a casting is formed. Then, the pair of movable mold halves 31 and 32 are opened, and the formed casting is taken out. Note that one of the movable mold halves 31 and 32 may be a fixed mold.

[0021] Also, as shown in FIGS. 1 and 2, the mold 20 is provided with a combustion device 21 and a sensor 22. The combustion device 21 shown in FIG. 2 raises the temperature of the mold 20 by supplying combustible gas to the mold 20 and burning the combustible gas.

[0022] The combustion device 21 shown in FIG. 2 supplies, for example, hydrogen gas as the combustible gas to the mold 20. The combustion device 21 shown in FIG. 2 burns the supplied combustible gas and raises the temperature of the mold 20 by the combustion flame 35.

[0023] As shown in FIG. 2, the combustion device 21 is provided above the sensor 22 in the mold 20. Also, although not shown in FIG. 2, the combustion device 21 may be provided below the sensor 22 in addition to above the sensor 22 in the mold 20. By adopting such a configuration, the temperature increase rate of the mold 20 can be further increased.

[0024] The sensor 22 shown in Figure 2 measures the amount of unburned combustible gas in the mold 20. Also, as shown in Figure 2, the sensor 22 is located in the mold 20 below the combustion device 21.

[0025] Here, when the combustion device 21 burns the supplied combustible gas to raise the temperature of the mold 20, there are cases where the combustible gas cannot be completely burned due to an excess supply. The unburned combustible gas leaks from the combustion device 21 and diffuses downward. The sensor 22 measures the amount of combustible gas diffused downward from the combustion device as the amount of unburned combustible gas in the mold 20. The sensor 22 transmits information regarding the measured amount of unburned combustible gas to the control device 10.

[0026] Although not shown in Figure 2, the mold 20 may also be equipped with a thermal camera and a cooling device. The thermal camera measures the temperature of the mold 20. The cooling device supplies cooling water to the mold 20. The cooling device controls the temperature of the cooling water, the amount of cooling water, the timing of the cooling water supply, and the duration of the cooling water supply based, for example, on the temperature of the mold 20 or the amount of unburned combustible gas in the mold 20. Alternatively, a control device 10, described later, may control the cooling device based on the temperature of the mold 20 or the amount of unburned combustible gas in the mold 20, and control the temperature of the cooling water, the amount of cooling water, the timing of the cooling water supply, and the duration of the cooling water supply.

[0027] <Control device> As shown in Figure 1, the control device 10 includes a control unit 11. The control unit 11 shown in Figure 1 receives information from the sensor 22 regarding the amount of unburned combustible gas. Based on the amount of unburned combustible gas in the mold 20, the control unit 11 controls the amount of combustible gas supplied to the mold 20.

[0028] Specifically, the control unit 11 controls the amount of combustible gas supplied to the mold 20 of the combustion device 21 to a predetermined value based on the amount of unburned combustible gas. The control unit 11 controls the supply amount of the combustion device 21 so that the supply amount per unit time is, for example, 5 L / sec. Alternatively, the control unit 11 may control the supply amount of the combustion device 21 so that the total supply amount is, for example, 300 L. Furthermore, the control unit 11 may control the supply amount of the combustion device 21 so that it reaches the maximum combustion value of the combustion device 21.

[0029] <Control Method> Next, the operation of the control system according to Embodiment 1, that is, the control method according to Embodiment 1, will be described. Figure 3 is a flowchart illustrating the control method according to Embodiment 1. The explanation will refer to Figures 1 and 2 as appropriate.

[0030] First, as shown in Figure 3, the combustion device 21 (see Figure 2) starts heating the mold 20 (see Figure 2) by supplying it with a combustible gas and burning the gas (step ST1).

[0031] Next, as shown in Figure 3, the sensor 22 (see Figure 2) measures the amount of combustible gas (unburned amount) diffused downward from the combustion device 21 (see Figure 2) (step ST2).

[0032] Next, as shown in Figure 3, the control unit 11 (see Figure 1) controls the amount of combustible gas supplied to the mold 20 based on the amount of unburned combustible gas in the mold 20 detected by the sensor 22 (step ST3). This suppresses the generation of unburned combustible gas in the combustion device 21, thereby preventing the accumulation of combustible gas in the mold 20.

[0033] Next, as shown in Figure 3, the combustion device 21 (see Figure 2) terminates the heating of the mold 20 (step ST4). Specifically, the combustion device 21 (see Figure 2) terminates the heating when the temperature of the mold 20 reaches a predetermined temperature.

[0034] Thus, in the control method according to Embodiment 1, the amount of combustible gas supplied to the mold is controlled based on the amount of unburned combustible gas in the mold. With this configuration, the control method according to Embodiment 1 can suppress the excessive supply of combustible gas to the mold and its accumulation within the mold.

[0035] Furthermore, since the sensor measures the amount of combustible gas diffused downward from the combustion device as the amount of unburned combustible gas in the mold, the amount of combustible gas supplied to the mold can be controlled more reliably.

[0036] Furthermore, in the control method according to Embodiment 1, the supply amount of flammable gas is controlled to an appropriate amount so as not to be excessive. As a result, in the control method according to Embodiment 1, the mold can be heated to the set temperature with an appropriate supply amount, and therefore the mold heating efficiency is high.

[0037] If an excessive amount of flammable gas is supplied to the mold, it can not only accumulate inside the mold but also cause the temperature to rise above the set speed of the mold. In this case, cooling water is required to lower the mold to the set speed. However, in the control method according to Embodiment 1, the supply of flammable gas is controlled to an appropriate amount, so the temperature of the mold cannot rise above the set speed of the mold, making it easy to set the mold to an appropriate temperature. Moreover, since cooling water is not required, equipment costs can be reduced. Thus, the control method according to Embodiment 1 enables appropriate temperature control and reduces equipment costs.

[0038] Furthermore, although hydrogen gas is highly flammable, the control method according to Embodiment 1 can suppress the accumulation of hydrogen gas within the mold 20 even when hydrogen gas is used as the flammable gas, thus ensuring high safety. In addition, since the control method according to Embodiment 1 can suppress the accumulation of hydrogen gas within the mold 20, hydrogen embrittlement of the mold 20 can be suppressed.

[0039] In Figure 4, an example is illustrated in which the control device 10 controls the amount of combustible gas supplied to the mold 20 by the combustion device 21 based on the amount of unburned combustible gas while raising the temperature of the mold. For example, when the temperature of the mold is raised repeatedly, the control device 10 may control the amount of combustible gas supplied to the mold 20 by the combustion device 21 based on the temperature history of the mold. Alternatively, the control device 10 may control the temperature of the cooling water, the amount of cooling water, the timing of the cooling water supply, and the duration of the cooling water supply based on the temperature history of the mold.

[0040] Furthermore, some or all of the processing in the control unit 11 described above can be implemented as a computer program. Such a program can be stored using various types of non-temporary computer-readable media and supplied to a computer. Non-temporary computer-readable media include various types of tangible recording media. Examples of non-temporary computer-readable media include magnetic recording media (e.g., flexible disks, magnetic tapes, hard disk drives), magneto-optical recording media (e.g., magneto-optical disks), CD-ROMs (Read Only Memory), CD-Rs, CD-R / Ws, and semiconductor memories (e.g., mask ROMs, PROMs (Programmable ROMs), EPROMs (Erasable PROMs), flash ROMs, and RAMs (Random Access Memory)). Programs may also be supplied to a computer by various types of temporary computer-readable media. Examples of temporary computer-readable media include electrical signals, optical signals, and electromagnetic waves. Temporary computer-readable media can be supplied to a computer via wired communication channels such as electric wires and optical fibers, or via wireless communication channels.

[0041] This disclosure is not limited to the embodiments described above, and may be modified as appropriate without departing from its intent. [Explanation of symbols]

[0042] 10 Control device 11 Control Unit 20 molds 21 Combustion device 22 sensors 31, 32 type 33. Space (cavity) 35 Combustion flame

Claims

1. A mold control system that raises the temperature by burning a supplied combustible gas, Based on the amount of unburned combustible gas in the mold, the amount of combustible gas supplied to the mold is controlled. Control system.

2. A combustion device that supplies the combustible gas to the mold and burns the combustible gas, The mold further comprises a sensor provided below the combustion device for measuring the amount of unburned combustible gas in the mold, The sensor measures the amount of combustible gas diffused downward from the combustion device as the amount of unburned combustible gas in the mold. The control system according to claim 1.

3. The aforementioned flammable gas is hydrogen gas. The control system according to claim 1 or 2.

4. A method for controlling a mold that raises the temperature by burning a supplied combustible gas, Based on the amount of unburned combustible gas in the mold, the amount of combustible gas supplied to the mold is controlled. The computer performs the process. Control method.

5. A mold control program that raises the temperature by burning the supplied combustible gas, Based on the amount of unburned combustible gas in the mold, the amount of combustible gas supplied to the mold is controlled. To have the computer perform the process. Control program.

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