Die-casting method and die-casting system

Abstract

To provide a method and system for die casting allowing for suppressing the occurrence of an unacceptable product.SOLUTION: A system for die casting 1 according to one aspect of the present disclosure, for casting metal parts continuously in a plurality of number of times, comprises a measuring section 12 that measures a temperature of a metal mold, a determining section 141 that determines whether or not a measured temperature of the metal mold is equal to or higher than a predetermined threshold, a cooling-liquid control section 142 that, if the measured temperature of the metal mold is equal to or higher than the predetermined threshold, increases the flow rate of cooling liquid to cool down the metal mold, a quality evaluating section 13 that evaluates the quality of the metal part cast in a predetermined cast cycle, and a threshold changing section 144 that changes the predetermined threshold based on an evaluation result of the quality of the metal part cast in the predetermined cast cycle.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a die casting method and a die casting system. [Background technology]

[0002] Patent Document 1 describes a temperature control device that controls the temperature of a mold used in die casting. The temperature control device described in Patent Document 1 cools the mold by applying a mold release agent to the mold. The temperature control device described in Patent Document 1 cools the mold until the surface temperature of the mold reaches a predetermined target temperature. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 9-122870 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when die casting is performed using a die with an excessively high temperature, a defect called galling is likely to occur. Therefore, in die casting, it is necessary to control the temperature of the die so that the temperature does not rise excessively.

[0005] However, the appropriate temperature of a die in die casting constantly changes depending on changes in the surrounding environment. If the die is cooled by referring to a fixed threshold value, as in the temperature control device described in Patent Document 1, it cannot respond to changes in the appropriate temperature of the die.

[0006] Therefore, in the temperature control device described in Patent Document 1, there are cases where die casting is performed using a mold whose temperature is higher than the appropriate temperature, i.e., a mold whose temperature has risen excessively. In other words, the technology described in Patent Document 1 has a problem in that it does not adequately control the temperature of the mold, and is unable to sufficiently suppress the occurrence of defective products.

[0007] The present disclosure has been made to solve such problems, and aims to provide a die-casting method and a die-casting system that can suppress the occurrence of defective products. [Means for solving the problem]

[0008] A die-casting method according to one aspect of the present disclosure includes: A die-casting method for continuously casting metal parts multiple times, comprising: measuring the temperature of the mold; determining whether the measured temperature of the mold is equal to or greater than a predetermined threshold; increasing the flow rate of the coolant for cooling the mold when the measured temperature of the mold is equal to or greater than the predetermined threshold; evaluating the quality of the cast metal parts in a given casting cycle; and changing the predetermined threshold value based on an evaluation result of the quality of the metal component cast in the predetermined casting cycle. This is a die-casting method.

[0009] A die casting system according to one aspect of the present disclosure includes: 1. A die casting system for casting metal parts multiple times in succession, comprising: a measuring unit for measuring the temperature of the mold; a determination unit that determines whether the measured temperature of the mold is equal to or higher than a predetermined threshold; a coolant control unit that increases the flow rate of the coolant that cools the mold when the measured temperature of the mold is equal to or higher than the predetermined threshold; a quality evaluation unit for evaluating the quality of a metal part cast in a predetermined casting cycle; a threshold value changing unit that changes the predetermined threshold value based on an evaluation result of the quality of the metal part cast in the predetermined casting cycle. It is a die-casting system.

[0010] With this configuration, the die-casting method and die-casting system according to the present disclosure can set a threshold value corresponding to an appropriate temperature change in the die, thereby preventing an excessive rise in the die temperature, and as a result, reducing the occurrence of defective products. [Effects of the Invention]

[0011] The present disclosure provides a die-casting method and a die-casting system that can suppress the occurrence of defective products. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a block diagram showing a configuration of a die-casting system according to a first embodiment. [Figure 2] FIG. 2 is a schematic cross-sectional view showing the configuration of a casting part according to the first embodiment. [Figure 3] 3 is a flowchart showing the operation of the die-casting system according to the first embodiment. [Figure 4] 3 is a flowchart showing the operation of the die-casting system according to the first embodiment. [Figure 5] 3 is a flowchart showing the operation of the die-casting system according to the first embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0013] (First embodiment) <Die-casting system configuration> A first embodiment of the present disclosure will be described in detail below with reference to the drawings. First, the configuration of a die-casting system according to this embodiment will be described in detail. Fig. 1 is a block diagram showing the configuration of the die-casting system according to the first embodiment.

[0014] The die-casting system 1 according to the first embodiment die-casts metal parts multiple times in succession, that is, the die-casting system 1 starts the next casting cycle continuously after the end of a casting cycle. However, the casting cycle here refers to a series of steps that the die-casting system 1 executes to manufacture one metal part.

[0015] Specifically, the casting cycle in this embodiment begins with the step of applying a release agent to the mold and ends with the step of removing the cast metal part from the mold. Therefore, in this embodiment, the step of applying a release agent to the mold is started immediately after the step of removing the cast metal part from the mold.

[0016] The die-casting system 1 according to this embodiment measures the temperature of the mold when a release agent is applied to the mold, and if the measured temperature of the mold is equal to or higher than a predetermined threshold, increases the flow rate of the coolant that cools the mold.

[0017] Furthermore, the die-casting system 1 according to this embodiment evaluates the quality of the metal part cast in a predetermined casting cycle. Then, the die-casting system 1 changes the predetermined threshold value based on the evaluation result. More specifically, the die-casting system 1 changes the predetermined threshold value based on the evaluation result and the mold temperature measured in the casting cycle following the predetermined casting cycle. The die-casting system 1 according to the first embodiment includes a casting unit 11, a measuring unit 12, a quality evaluation unit 13, and a control unit .

[0018] FIG. 2 is a schematic cross-sectional view showing the configuration of the casting part according to the first embodiment. Naturally, the right-handed xyz Cartesian coordinate system shown in Fig. 2 is a convenient way to explain the positional relationships of the components. In the right-handed xyz Cartesian coordinate system shown in Fig. 2, the positive direction of the z axis indicates a vertically upward direction, and the xy plane indicates a horizontal plane. In addition, in the description of FIG. 2, reference will be made to FIG. 1 as appropriate.

[0019] The casting unit 11 according to this embodiment performs die-casting of metal parts under the control of the control unit 14. More specifically, the casting unit 11 performs the following steps as one casting cycle in the order listed: applying a release agent to a mold, closing the mold, pouring molten metal, injecting the molten metal, solidifying the molten metal, opening the mold, and removing the cast metal part from the mold.

[0020] Furthermore, casting unit 11 cools the mold with a coolant. More specifically, casting unit 11 regulates the temperature of the mold with the coolant so that the temperature of the mold does not rise excessively. Casting unit 11 adjusts at least the flow rate of the coolant based on control from control unit 14.

[0021] The casting part 11 according to this embodiment includes a movable mold 111, a fixed mold 112, coolant supply devices 113a and 113b, coolant flow paths 114a and 114b, a plunger 115, and a release agent application nozzle .

[0022] The movable mold 111 and the fixed mold 112 are molds that the casting section 11 includes. The movable mold 111 is a mold that can move in the positive and negative directions of the y-axis. The movable mold 111 has a coolant flow path 114a inside. The temperature of the movable mold 111 is adjusted by the coolant flowing through the coolant flow path 114a.

[0023] In the process of applying a release agent to a mold, the surface of the movable mold 111 is coated with a release agent by a release agent application nozzle 116. Furthermore, while the release agent is being applied to the movable mold 111, the surface temperature is measured by the measuring unit 12.

[0024] In the mold closing step, the movable mold 111 moves in the positive direction of the y-axis until it abuts against the fixed mold 112, and is then fixed. Thereafter, the movable mold 111 is fixed in position and maintained in a state of abutting against the fixed mold 112 until the step of solidifying the molten metal is completed.

[0025] In the mold opening step, the movable mold 111 moves in the negative y-axis direction to a predetermined position. Thereafter, in the step of removing the cast metal part from the mold, the cast metal part is removed from the movable mold 111. The movable mold 111 may be provided with a pin for removing the cast metal part.

[0026] The fixed mold 112 is a mold that is fixed in position. The fixed mold 112 has a coolant flow path 114b inside. The temperature of the fixed mold 112 is adjusted by the coolant that flows through the coolant flow path 114b.

[0027] In the process of applying a release agent to a mold, the surface of the fixed mold 112 is coated with a release agent by a release agent application nozzle 116. Furthermore, while the release agent is being applied to the fixed mold 112, the surface temperature is measured by the measuring unit 12. In the mold closing step, the fixed mold 112 comes into contact with the moving movable mold 111. Thereafter, the fixed mold 112 is maintained in contact with the movable mold 111 until the step of solidifying the molten metal is completed.

[0028] A cylinder C for injecting molten metal into the space inside the mold is formed in the fixed mold 112. A pouring port I for pouring molten metal into the cylinder C is formed on the side of the cylinder C. A plunger 115 for forcing molten metal into the internal space of the mold is fitted into the cylinder C.

[0029] In the process of pouring molten metal, molten metal is poured into cylinder C from pouring port I. In the process of injecting molten metal, the molten metal poured into cylinder C is pushed by plunger 115 and injected into the space within the mold.

[0030] The plunger 115 is a piston fitted into the cylinder C, and moves in the y-axis direction within the cylinder C based on the control of the control unit 14. In the process of injecting the molten metal, the plunger 115 pushes the molten metal poured into the cylinder C in the negative direction of the y-axis, and injects the molten metal into the internal space of the mold.

[0031] The coolant supply device 113a supplies coolant through the coolant flow path 114a to the inside of the movable mold 111. The coolant supplied by the coolant supply device 113a may be, for example, water or an antifreeze liquid containing ethylene glycol or the like as a main component.

[0032] The coolant supply device 113a supplies the coolant to the inside of the movable mold 111 based on control from the control unit 14. The coolant supply device 113a according to this embodiment adjusts at least the flow rate of the coolant based on control from the control unit 14.

[0033] The coolant supply device 113a may adjust parameters other than the flow rate of the coolant based on control from the control unit 14. For example, the coolant supply device 113a may adjust the temperature of the coolant based on control from the control unit 14.

[0034] The coolant supply device 113b supplies the coolant through the coolant flow path 114b to the inside of the fixed mold 112. The coolant supplied by the coolant supply device 113b may be, for example, water or an antifreeze liquid containing ethylene glycol or the like as a main component.

[0035] The coolant supply device 113b supplies the coolant to the inside of the fixed mold 112 based on control from the control unit 14. The coolant supply device 113b according to this embodiment adjusts at least the flow rate of the coolant based on control from the control unit 14.

[0036] The coolant supplying device 113b may adjust parameters other than the flow rate of the coolant based on control from the control unit 14. For example, the coolant supplying device 113b may adjust the temperature of the coolant based on control from the control unit 14.

[0037] Although the coolant supply devices 113a and 113b according to this embodiment are described as separate devices, the coolant supply devices 113a and 113b may be a single device. That is, a single coolant supply device may be configured to supply coolant to the interiors of the movable mold 111 and the fixed mold 112.

[0038] The coolant flow path 114a is a flow path through which the coolant flows, and passes through the inside of the movable mold 111. The coolant passing through the coolant flow path 114a cools the movable mold 111. The coolant flow path 114b is a flow path through which the coolant flows, and passes through the inside of the fixed mold 112. The coolant passing through the coolant flow path 114b cools the fixed mold 112.

[0039] The release agent application nozzle 116 is a nozzle that sprays the release agent. The release agent application nozzle 116 is configured so that the position and direction of the spray outlet can be freely adjusted. The release agent application nozzle 116 applies the release agent to the surfaces of the movable mold 111 and the fixed mold 112 in the process of applying the release agent to the mold. A measuring unit 12 is attached to the release agent application nozzle.

[0040] Returning to the explanation of Figure 1, in the following explanation, Figure 2 will be referred to as appropriate. The measuring unit 12 measures the temperature of the mold during the process of applying the mold release agent to the mold, and outputs the measured temperature to the control unit 14.

[0041] The measuring unit 12 according to this embodiment is an infrared temperature sensor provided in a nozzle that applies the release agent, that is, a release agent application nozzle 116. The measurement unit 12 is attached near the nozzle of the release agent application nozzle 116, and is configured so that the measurement point moves in accordance with the movement of the position and direction of the nozzle. With this configuration, the measurement unit 12 can measure the temperature of the mold surface without any blind spots.

[0042] However, the configuration of the measurement unit 12 is not limited to this, and any configuration is possible as long as it is capable of measuring the temperature of the mold surface. For example, the measurement unit may be a thermal camera that measures the temperature of the mold surface from a predetermined position.

[0043] The quality evaluation unit 13 evaluates the quality of the metal part cast in a predetermined casting cycle, and outputs the quality evaluation result to the control unit 14. However, the predetermined casting cycle here may refer to, for example, the entire casting cycle executed by the casting unit 11, or may refer to a part of the casting cycle executed by the casting unit 11.

[0044] That is, the quality evaluation unit 13 may evaluate the quality of the cast metal part during the entirety of the executed casting cycle, or may evaluate the quality of the cast metal part during a portion of the executed casting cycle.

[0045] For example, the quality evaluation unit 13 may evaluate the quality of the cast metal part every time a predetermined number of casting cycles are executed. Also, for example, the quality evaluation unit 13 may evaluate the quality of the cast metal part in a casting cycle designated by a user.

[0046] The quality evaluation method executed by the quality evaluation unit 13 and the device configuration of the quality evaluation unit can be selected appropriately depending on the type of part, etc. However, the die-casting system 1 according to the present disclosure is configured to feed back the evaluation results output by the quality evaluation unit 13 to the temperature control of the mold. Therefore, it is particularly preferable that the quality evaluation unit 13 is configured to be able to evaluate the presence or absence of defects correlated with the surface temperature of the mold as the quality of the metal part. An example of a defect correlated with the surface temperature of the mold is a galling defect on the surface of the metal part.

[0047] For example, the quality evaluation unit 13 may be a device that takes an image of the surface of a cast metal part and evaluates the amount of defects on the surface of the metal part from the taken image. Furthermore, for example, the quality evaluation unit 13 may be configured to measure the weight of the cast metal part and evaluate the amount of shrinkage cavities inside the metal part based on the measured weight. Furthermore, for example, the quality evaluation unit 13 may be a device for the user to input the results of the user's visual quality evaluation.

[0048] The control unit 14 includes a calculation unit such as a CPU (Central Processing Unit) (not shown), and a storage unit such as a RAM (Random Access Memory) or a ROM (Read Only Memory) that stores programs and data for controlling the die-casting system 1. In other words, the control unit 14 functions as a computer, and controls the die-casting system 1 based on the programs.

[0049] 1 can be realized in hardware terms by the CPU, memory unit, other circuits, etc., and in software terms by a program stored in the memory unit for controlling the die-casting system 1. In other words, the control unit 14 can be realized in various forms by hardware, software, or a combination of both.

[0050] The control unit 14 acquires the surface temperature of the mold from the measurement unit 12. When the acquired surface temperature is greater than a predetermined threshold, the control unit 14 controls the coolant supply devices 113a and 113b so as to increase the flow rate of the coolant.

[0051] Furthermore, the control unit 14 acquires the evaluation results of the quality of the metal part cast in a predetermined casting cycle from the quality evaluation unit 13. Then, the control unit 14 changes the above-mentioned predetermined threshold value based on the acquired evaluation results and the mold surface temperature measured by the measurement unit 12 in the casting cycle next to the predetermined casting cycle. The control unit 14 includes a determination unit 141 , a coolant control unit 142 , a notification unit 143 , and a threshold value change unit 144 .

[0052] The determination unit 141 acquires the mold temperature measured by the measurement unit 12 from the measurement unit 12. The determination unit 141 determines whether the measured mold temperature is equal to or higher than a predetermined threshold value. The determination unit 141 outputs the determination result to the coolant control unit 142 and the notification unit 143.

[0053] The coolant control unit 142 controls the coolant supply devices 113a and 113b. More specifically, the coolant control unit 142 controls the flow rate of the coolant supplied by the coolant supply devices 113a and 113b. The coolant control unit 142 may also control the temperature of the coolant supplied by the coolant supply devices 113a and 113b.

[0054] The coolant control unit 142 acquires the determination result as to whether the measured temperature of the mold is equal to or higher than a predetermined threshold value from the determination unit 141. If the measured temperature of the mold is equal to or higher than the predetermined threshold value, the coolant control unit 142 increases the flow rate of the coolant that cools the mold. With this configuration, the control unit 14 can prevent the temperature of the mold from rising excessively, and as a result, the control unit 14 can prevent the occurrence of defective products caused by a rise in the temperature of the mold.

[0055] When increasing the flow rate of the coolant that cools the mold, the coolant control unit 142 may increase the flow rate of the coolant by, for example, a predetermined numerical value. Furthermore, when increasing the flow rate of the coolant that cools the mold, the coolant control unit 142 may increase the flow rate of the coolant at a predetermined rate, for example.

[0056] Furthermore, when increasing the flow rate of the coolant that cools the mold, the coolant control unit 142 may calculate a value based on the difference between the measured mold temperature and a predetermined threshold value, and then the coolant control unit 142 may increase the flow rate of the coolant by that value.

[0057] The notification unit 143 notifies the user of a warning. For example, the notification unit 143 may display a warning message using a display device or the like. Furthermore, the notification unit 143 may emit an alarm sound using a speaker device or the like.

[0058] The notification unit 143 acquires the determination result as to whether or not the measured mold temperature is equal to or higher than a predetermined threshold value from the determination unit 141. If the measured mold temperature is equal to or higher than the predetermined threshold value, the notification unit 143 notifies the user of a warning. When notifying the user of a warning, the notification unit 143 may notify the user of a message that there is a high possibility of defective products being produced.

[0059] The threshold value changing unit 144 acquires the evaluation results of the quality of the metal part cast in a predetermined casting cycle from the quality evaluation unit 13. The threshold value changing unit 144 changes the predetermined threshold value based on the evaluation results of the quality of the metal part cast in the predetermined casting cycle. The threshold value changing unit 144 outputs the changed predetermined threshold value to the determining unit 141 .

[0060] As described above, in the die-casting system 1 according to this embodiment, after the process of removing the cast metal part from the mold is completed, the process of applying a mold release agent to the mold is started immediately.

[0061] Therefore, the temperature of the mold measured at the timing when the mold release agent is applied to the mold in the casting cycle following a given casting cycle reflects the casting conditions of the metal part in the given casting cycle.

[0062] In other words, there is a correlation between the quality of the metal part cast in a given casting cycle and the temperature of the mold measured at the timing when the mold release agent is applied to the mold in the casting cycle following the given casting cycle.

[0063] Therefore, the threshold value changing unit 144 changes the predetermined threshold value based on the evaluation results of the quality of the metal part cast in a predetermined casting cycle and the temperature of the mold measured at the timing of applying the mold release agent to the mold in the casting cycle next to the predetermined casting cycle. With this configuration, the control unit 14 can more appropriately reflect appropriate changes in the mold temperature in the predetermined threshold value.

[0064] However, the configuration of the threshold value changing unit 144 is not limited to the above. For example, the threshold value changing unit 144 may change the predetermined threshold value based only on the evaluation result of the quality of the metal part cast in a predetermined casting cycle. In addition, the threshold value changing unit 144 may change the predetermined threshold value based on the evaluation results of the quality of the metal part cast in a predetermined casting cycle and the temperature of the mold measured at the timing when the mold release agent is applied to the mold in the predetermined casting cycle. Even with this configuration, the threshold value changing unit 144 according to this embodiment can appropriately change the predetermined threshold value.

[0065] For example, the threshold value changing unit 144 may change the predetermined threshold value using a trained model that receives the temperature of the mold and the quality of the metal part as input data and outputs a predetermined threshold value according to the input data. In other words, the threshold value changing unit 144 may change the predetermined threshold value using artificial intelligence (AI).

[0066] <Die-casting system operation> Next, the operation of the die-casting system, that is, the die-casting method according to the first embodiment will be described in detail, with reference to Figures 1 and 2 as needed in the following description.

[0067] Fig. 3 is a flowchart showing the operation of the die-casting system according to the first embodiment. More specifically, Fig. 3 is a flowchart showing the operation that the die-casting system 1 performs in one casting cycle.

[0068] First, the measuring unit 12 measures the temperature of the mold while the release agent application nozzle 116 applies the release agent (step ST101). Next, the determining unit 141 determines whether the measured temperature of the mold is equal to or higher than a predetermined threshold value (step ST102).

[0069] If the measured mold temperature is equal to or higher than a predetermined threshold value (YES in step ST102), the notification unit 143 issues a warning to the user (step ST103), and the coolant supply devices 113a and 113b increase the flow rate of the coolant (step ST104). The order of execution of step ST103 and step ST104 may be reversed. That is, step ST103 may be executed after step ST104 is executed. Furthermore, step ST103 and step ST104 may be operations executed in parallel.

[0070] If the measured mold temperature is not equal to or higher than the predetermined threshold (NO in step ST102), the die-casting system 1 executes step ST105 without executing steps ST103 and ST104. In other words, if the measured mold temperature is not equal to or higher than the predetermined threshold, the coolant supply devices 113a and 113b do not change the flow rate of the coolant.

[0071] Next, the casting unit 11 performs die-casting (step ST105). More specifically, the casting unit 11 casts a metal part by die-casting. Fig. 4 is a flowchart showing the operation of the die-casting system according to the first embodiment. More specifically, Fig. 4 is a flowchart showing the process executed by the casting unit 11 in step ST105.

[0072] In step ST105, first, the movable die 111 and the fixed die 112 are closed (step ST151). Next, molten metal is poured into the cylinder C (step ST152). Note that step ST152 may be performed by, for example, a user or by a molten metal supply device (not shown).

[0073] Next, the cylinder C and plunger 115 inject the molten metal (step ST153). More specifically, the plunger 115 pushes the molten metal poured into the cylinder C. Then, the pushed-in molten metal is injected from the cylinder C into the space within the mold.

[0074] Next, casting unit 11 solidifies the molten metal (step ST154). More specifically, casting unit 11 solidifies the molten metal injected in step ST153 in the space within the mold. Finally, movable mold 111 and fixed mold 112 open (step ST155), and casting unit 11 completes the operation of step ST105.

[0075] Returning to the explanation of Figure 3. Finally, after step ST105 is completed, that is, after the metal part is cast, the casting unit 11 removes the cast metal part from the mold (step ST106), and the die-casting system 1 completes the series of operations. The die-casting system 1 executes the above-described series of operations multiple times in succession.

[0076] Next, the operation of the die-casting system 1 to change the predetermined threshold will be described in detail. Fig. 5 is a flowchart showing the operation of the die-casting system according to the first embodiment. More specifically, Fig. 5 is a flowchart showing the operation of the die-casting system 1 to change the predetermined threshold.

[0077] First, the quality evaluation unit 13 evaluates the quality of a metal part cast in a predetermined casting cycle (step ST201). Next, the threshold change unit 144 acquires the temperature of the mold measured in the casting cycle next to the predetermined casting cycle (step ST202).

[0078] More specifically, the quality evaluation unit 13 evaluates the quality of the metal part cast in the nth step ST105. Then, the threshold change unit 144 acquires the mold temperature measured in the (n+1)th step ST101, where n is an integer equal to or greater than 1, and the nth casting cycle corresponds to the predetermined casting cycle.

[0079] Finally, the threshold value changing unit 144 changes the predetermined threshold value based on the acquired quality of the metal part and the acquired temperature of the mold (step ST203), and the die-casting system 1 ends the series of operations.

[0080] In other words, the die-casting system 1 according to this embodiment changes the predetermined threshold value based on the quality of the metal part cast in the nth step ST105 and the temperature of the mold measured in the n+1th step ST101.

[0081] Step ST101 of the (n+1)th time is a step that is executed consecutively after execution of steps ST105 and ST106 of the nth time. Therefore, the temperature of the mold measured in step ST101 of the (n+1)th time reflects the casting conditions in step ST105 of the nth time.

[0082] Here, the quality of the metal part is determined by the casting conditions in step ST105. Therefore, the temperature of the mold measured in step ST101 of the (n+1)th casting has a correlation with the quality of the metal part cast in step ST105 of the nth casting.

[0083] Therefore, the die-casting system 1 according to this embodiment changes the predetermined threshold value based on the temperature of the mold measured in step ST101 of the (n+1)th iteration and the quality of the metal part cast in step ST105 of the (n)th iteration. With this configuration, the die-casting system 1 according to this embodiment can prevent the temperature of the mold from rising excessively even when the appropriate temperature of the mold changes.

[0084] As described above, the die-casting system 1 according to this embodiment measures the temperature of the mold during the process of applying a release agent to the mold. With this configuration, the die-casting system 1 can measure the surface temperature of the mold without any blind spots.

[0085] Furthermore, when the measured temperature is higher than a predetermined threshold, the die-casting system 1 increases the flow rate of the coolant flowing through the die. With this configuration, the die-casting system 1 can suppress the occurrence of defective products caused by an excessive rise in the temperature of the die.

[0086] Furthermore, the die-casting system 1 changes the predetermined threshold value based on the evaluation results of the quality of the metal part cast in a predetermined casting cycle. With this configuration, even if the appropriate temperature of the mold changes, the die-casting system 1 can prevent the mold from excessively increasing in temperature. As a result, the die-casting system 1 can reduce the occurrence of defective products.

[0087] In addition, the die-casting system 1 changes the predetermined threshold value based on the evaluation results of the quality of the metal part cast in a predetermined casting cycle and the temperature of the mold measured at the timing of applying a mold release agent to the mold in the casting cycle next to the predetermined casting cycle. With this configuration, the die-casting system 1 can change the predetermined threshold value more appropriately.

[0088] The present invention has been described above in accordance with the above-described embodiments, but the present invention is not limited to the configurations of the above-described embodiments, and naturally includes various modifications, alterations, and combinations that can be made by a person skilled in the art within the scope of the invention claimed in the claims of this application. [Explanation of symbols]

[0089] 1 die-casting system, 11 casting section, 111 movable mold, 112 fixed mold, 113a and 113b coolant supply device, 114a and 114b coolant flow path, 115 plunger, 116 release agent application nozzle, C cylinder, I intake port, 12 measurement section, 13 quality evaluation section, 14 control section, 141 judgment section, 142 coolant control section, 143 notification section, 144 threshold change section

Claims

1. A die-casting method for continuously casting metal parts multiple times, comprising: measuring the temperature of the mold; determining whether the measured temperature of the mold is equal to or greater than a predetermined threshold; increasing the flow rate of the coolant for cooling the mold when the measured temperature of the mold is equal to or greater than the predetermined threshold; evaluating the amount of galling defects on the surface of the metal part as a quality of the metal part cast in a predetermined casting cycle; and changing the predetermined threshold value based on the evaluation result of the quality of the metal part cast in the predetermined casting cycle and the temperature of the mold measured at the timing of applying a mold release agent to the mold in the casting cycle next to the predetermined casting cycle. Die-casting method.

2. In the step of measuring the temperature of the mold, the temperature of the mold is measured by an infrared temperature sensor provided in a nozzle for applying the mold release agent. The die casting method according to claim 1 .

3. 1. A die casting system for casting metal parts multiple times in succession, comprising: a measuring unit for measuring the temperature of the mold; a determination unit that determines whether the measured temperature of the mold is equal to or higher than a predetermined threshold; a coolant control unit that increases the flow rate of the coolant that cools the mold when the measured temperature of the mold is equal to or higher than the predetermined threshold; a quality evaluation unit that evaluates the amount of galling defects on the surface of the metal part as the quality of the metal part cast in a predetermined casting cycle; a threshold value changing unit that changes the predetermined threshold value based on an evaluation result of the quality of the metal part cast in the predetermined casting cycle and a temperature of the mold measured at a timing when a mold release agent is applied to the mold in a casting cycle next to the predetermined casting cycle. Die casting system.

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