Die casting device

Abstract

The invention provides a die casting device capable of maintaining the quality of a molded product and shortening the cleaning time of a die. A die casting device (100) is provided with common dies (52, 62) and dedicated dies (54, 64). When replacing the dedicated dies (54, 64), the cleaner (30) cleans the exposed surfaces (53, 63) of the general-purpose dies (52, 62) from which the dedicated dies (54, 64) have been removed. The exposed surfaces (53, 63) include molding surfaces (52A, 62A) and seating surfaces (52B, 62B). The molding surfaces (52A, 62A) are in contact with the molded article (70). The dedicated dies (54, 64) are seated on the seating surfaces (52B, 62B). The cleaner (30) cleans the molding surfaces (52A, 62A) until the foreign matter residual rate (Rco) is equal to or less than a first threshold value (Rth1). The cleaner (30) cleans the seating surfaces (52B, 62B) until the foreign matter residual rate (Rso) is equal to or less than a second threshold value (Rth2). The foreign matter residual rate of the second threshold value (Rth2) is higher than that of the first threshold value (Rth1).

Description

Technical Field

[0001] This specification discloses a die-casting apparatus. Background Technology

[0002] In Patent Document 1, burrs adhering to the mold of the die-casting device are removed by shot peening or the like. Furthermore, in Patent Document 2, high-pressure water is used to remove the coating agent adhering to the mold surface.

[0003] Furthermore, in Patent Document 3, both a general-purpose mold and a special-purpose mold were used as molds. The special-purpose mold can be assembled and disassembled relative to the general-purpose mold. For example, the special-purpose mold can be replaced depending on the product being molded.

[0004] Prior art literature

[0005] Patent documents

[0006] Patent Document 1: Chinese Patent Application Publication No. 115555541

[0007] Patent Document 2: Japanese Patent Application Publication No. 2000-262990

[0008] Patent Document 3: Japanese Patent Application Publication No. 2005-104071 Summary of the Invention

[0009] The problem to be solved by the present invention

[0010] However, as molds become larger, the cleaning time for the molds increases. Therefore, this specification discloses a die-casting apparatus that can shorten the mold cleaning time while maintaining the quality of the molded product.

[0011] Methods for solving problems

[0012] This specification discloses a die-casting apparatus. The apparatus includes a general-purpose mold, a special-purpose mold, and a cleaner. The general-purpose mold is used for various types of molded articles. The special-purpose mold is changed according to the type of molded article. The cleaner cleans the general-purpose mold. When changing to a special-purpose mold, the cleaner cleans the exposed surfaces of the general-purpose mold from which the special-purpose mold has been removed. The exposed surfaces when changing to a special-purpose mold include the molding surface and the seating surface. The molding surface contacts the molded article. The special-purpose mold sits on the seating surface. The cleaner cleans the molding surface until the foreign matter residue rate falls below a first threshold. Furthermore, the cleaner cleans the seating surface until the foreign matter residue rate falls below a second threshold. The foreign matter residue rate at the second threshold is higher than the first threshold.

[0013] Based on the above structure, since the seating surface does not contact the molded part, its impact on the quality of the molded part is relatively low. By reducing the cleaning requirements of the seating surface compared to the molding surface, it is possible to balance the maintenance of molded part quality and the reduction of cleaning time.

[0014] Furthermore, in the above structure, a connector can be provided on the seating surface of the general-purpose mold. The connector is connected to the cooling channel of the special-purpose mold. The cleaner cleans the connector until the foreign matter residue rate falls below a first threshold.

[0015] Based on the above structure, by setting the cleaning requirement of the joint to the same level as the molding surface, leakage of cooling water can be suppressed.

[0016] Furthermore, in the above structure, the cleaner cleans the molded surface until the discoloration residue rate falls below the third threshold and the foreign matter residue rate falls below the first threshold. Additionally, regardless of whether discoloration occurs, the cleaner cleans the seating surface until the foreign matter residue rate falls below the second threshold.

[0017] Sometimes, the seating surface and molding surface may discolor due to the adhesion of stains or other contaminants from the release material. If this discoloration is transferred to the molded part, the molded part may be deemed defective. Since the seating surface does not contact the molded part, the possibility of discoloration being transferred to the molded part is low. By eliminating discoloration from the seating surface as a cleaning requirement, cleaning time can be shortened.

[0018] Furthermore, this specification discloses a die-casting apparatus. This apparatus includes a general-purpose mold, a special-purpose mold, a processor, and a cleaner. The general-purpose mold is used for various types of molded articles. The special-purpose mold is changed according to the type of molded article. The cleaner cleans the general-purpose mold. The processor controls the cleaner. When changing to a special-purpose mold, the processor causes the cleaner to clean the exposed surface of the general-purpose mold from which the special-purpose mold has been removed. The exposed surface during special-purpose mold replacement includes the molding surface and the seating surface. The molding surface contacts the molded article. The special-purpose mold sits on the seating surface. The processor causes the cleaner to perform cleaning of the molding surface until the foreign matter residue rate falls below a first threshold. Furthermore, the processor causes the cleaner to perform cleaning of the seating surface until the foreign matter residue rate falls below a second threshold. The foreign matter residue rate at the second threshold is higher than the first threshold.

[0019] Furthermore, in the above structure, a connector can be provided on the seating surface of the general-purpose mold. The connector is connected to the cooling channel of the special-purpose mold. The processor causes the cleaner to perform cleaning of the connector until the foreign matter residue rate falls below a first threshold.

[0020] Invention Effects

[0021] The die-casting apparatus disclosed in this specification can shorten the mold cleaning time while maintaining the quality of the molded product. Attached Figure Description

[0022] Figure 1 This is a diagram illustrating the die-casting apparatus according to this embodiment.

[0023] Figure 2 This is a side sectional view illustrating what it looks like when a special mold is mounted on a general mold.

[0024] Figure 3 This diagram illustrates the molding process using the die-casting apparatus described in this embodiment.

[0025] Figure 4 This is a diagram illustrating the hardware structure of a computer device.

[0026] Figure 5 This is a diagram illustrating the functional blocks of a computer device.

[0027] Figure 6 This diagram illustrates a general mold cleaning process. Detailed Implementation

[0028] 1. Device Overview

[0029] exist Figure 1 The die-casting apparatus 100 according to this embodiment is illustrated in the figure. The die-casting apparatus 100 includes a fixed mold 50, a movable mold 60, a cleaner 30, cameras 40A and 40B, and a computer device 10.

[0030] like Figure 3 As illustrated above, the fixed mold 50 and the movable mold 60 close together. A gate 55 and a cavity 57 are formed between the fixed mold 50 and the movable mold 60. The closing force is, for example, 4000t or more. Based on such a closing force, the die casting apparatus 100 is also called a MEGA die casting machine or a GIGA die casting machine (large integrated die casting machine).

[0031] Molten liquid 59 is injected into the sleeve 56 through the grout port 56A. The molten liquid 59 is injected at high speed and pressure into the gate 55 and the cavity 57 via the piston 58. Furthermore, cooling water is supplied to the cooling channels 52C and 54C of the fixed mold 50 and the cooling channels 62C and 64C of the movable mold 60. By cooling the molten liquid 59 within the gate 55 and the cavity 57, thus achieving… Figure 3 As illustrated in the lower part, the molded product 70 is obtained.

[0032] Furthermore, as described later, when changing the type of molded article 70, special molds 54 and 64 are replaced in the fixed mold 50 and the movable mold 60. At this time, the exposed surfaces 53 and 63 of the general-purpose molds 52 and 62 are cleaned. The exposed surfaces 53 and 63 include the molding surfaces 52A and 62A and the seating surfaces 52B and 62B. As described later, the cleaning standards for the seating surfaces 52B and 62B are set more leniently compared to the molding surfaces 52A and 62A. As a result, the cleaning time is reduced.

[0033] 2. General-purpose molds and special-purpose molds

[0034] Reference Figure 1 , Figure 2 The fixed mold 50 has a general-purpose mold 52 and a special-purpose mold 54. Similarly, the movable mold 60 has a general-purpose mold 62 and a special-purpose mold 64. The general-purpose molds 52 and 62 are used for various types of molded products. The special-purpose molds 54 and 64 are changed according to the type (shape) of the molded product.

[0035] For example, the specialized molds 54 and 64 are formed from multiple types. For instance, the shapes of the forming surfaces 54A of the multiple specialized molds 54 are all different. Similarly, the shapes of the forming surfaces 64A of the multiple specialized molds 64 are all different. Furthermore, the multiple specialized molds 54 can be mounted on the general-purpose mold 52. Similarly, the multiple specialized molds 64 can be mounted on the general-purpose mold 62. The specialized molds 54 and 64 are fixed to the general-purpose molds 52 and 62 by a mounting / removing mechanism (not shown).

[0036] General-purpose molds 52 and 62 have forming surfaces 52A and 62A and seating surfaces 52B and 62B. Similarly, special-purpose molds 54 and 64 have forming surfaces 54A and 64A and seating surfaces 54B and 64B.

[0037] The seating surfaces 54B and 64B of the special molds 54 and 64 are seated on the seating surfaces 52B and 62B of the general molds 52 and 62. The seating surfaces 52B and 62B of the general molds 52 and 62 and the seating surfaces 54B and 64B of the special molds 54 and 64 have complementary shapes.

[0038] The forming surfaces 52A and 62A of general molds 52 and 62, and the forming surfaces 54A and 64A of special molds 54 and 64, and the melt 59 (see reference). Figure 3 The surfaces 52A, 62A, 54A, and 64A are in contact with the molded article 70. That is, the surface shapes of the molded surfaces 52A, 62A, 54A, and 64A are transferred onto the surface of the molded article 70.

[0039] Cooling channels 52C and 62C are formed in the general molds 52 and 62. The cooling channels 52C and 62C are connected to the cooling water tank or drain hose from the back side opposite to the seat surface 52B and 62B.

[0040] Female connectors 52D and 62D are provided at the ends of the seating surfaces 52B and 62B of the cooling channels 52C and 62C. That is, female connectors 52D and 62D are provided on the seating surfaces 52B and 62B.

[0041] Cooling channels 54C and 64C are formed in special molds 54 and 64. Male connectors 54D and 64D are provided at both ends of the cooling channels 54C and 64C. The male connectors 54D and 64D protrude from the seating surfaces 54B and 64B of the special molds 54 and 64. Cooling channels 52C and 54C are connected by a female connector 52D connected to the male connector 54D. Similarly, cooling channels 62C and 64C are connected by a female connector 62D connected to the male connector 64D.

[0042] 3. Washer

[0043] The cleaner 30 cleans the general-purpose molds 52 and 62. The cleaner 30 enters between the fixed mold 50 and the movable mold 60 in the open state. The cleaner 30 is equipped with a robotic arm 20 and a nozzle 25. The robotic arm 20 is, for example, a multi-joint robot.

[0044] A nozzle 25 is provided at the top of the robotic arm 20. Multiple spray nozzles are provided on the nozzle 25, for example. Cleaning solution is sprayed at high pressure from these nozzles.

[0045] As described later, when changing the special molds 54 and 64, the cleaner 30 cleans the exposed surfaces 53 and 63 after the special molds 54 and 64 have been removed. The exposed surfaces 53 and 63 include the forming surfaces 52A and 62A and the seating surfaces 52B and 62B.

[0046] Aluminum residue (metal slag) adheres to the exposed surfaces 53 and 63. For example, when residue accumulates on the seating surfaces 52B and 62B, the special molds 54 and 64 will be seated on the general molds 52 and 62 in a misaligned state relative to their normal positions. Furthermore, when residue accumulates on the molding surfaces 52A and 62A, the shape of the residue will be transferred to the molded article 70.

[0047] In addition, exposed surfaces 53 and 63 may develop stains (discoloration) due to the release material and lubricating material. In particular, if stains are present on molded surfaces 52A and 62A, these stains may be transferred to the molded article 70, thus potentially causing discoloration on a portion of the surface of the molded article 70.

[0048] Therefore, the cleaner 30 removes the deposits and stains accumulated on the exposed surfaces 53 and 63. As will be described later, the cleaning standards for the seating surfaces 52B and 62B are set more leniently than those for the molded surfaces 52A and 62A. As a result, the cleaning time is reduced.

[0049] Reference Figure 1 The die-casting apparatus 100 is equipped with cameras 40A and 40B. The cameras 40A and 40B capture images of the degree of contamination on the exposed surfaces 53 and 63. The captured image data of the exposed surfaces 53 and 63 is sent to the computer device 10.

[0050] 4. Computer device

[0051] Reference Figure 4 The computer device 10 is connected to the display unit 16, the input device 17, the robotic arm 20, and the cameras 40A and 40B. (See reference...) Figure 1 The display unit 16 may be a display device. The input device 17 may be an input device such as a keyboard or mouse.

[0052] The computer device 10 includes a CPU 11, RAM 12, ROM 13, storage 14, and input / output controller 15.

[0053] CPU 11 is the central processing unit, also known as a processor. As described later, CPU 11 controls the robotic arm 20, the nozzle 25, and the cameras 40A and 40B. RAM 12 is a volatile storage device that temporarily stores data during operation. ROM 13 is a storage device capable of data retrieval. Memory 14 is a storage device capable of data writing and retrieval. Memory 14 may be composed of, for example, HDD (Hard Disk Drive) or SSD (Solid State Drive).

[0054] By executing a program stored in memory 14 or ROM 13 through CPU 11, a system is built in computer device 10. Figure 5 The illustrated function blocks. CPU 11 (processor) includes a camera control unit 18A, a molding surface discoloration detection unit 18B, a molding surface foreign object detection unit 18C, a seating surface foreign object detection unit 18D, and a robot control unit 18E. These function blocks execute... Figure 6 The illustrated general mold cleaning process.

[0055] The molding surface discoloration detection unit 18B, the molding surface foreign object detection unit 18C, and the seating surface foreign object detection unit 18D can be neural networks for image recognition. For example, a convolutional neural network (CNN) is installed in the molding surface discoloration detection unit 18B, the molding surface foreign object detection unit 18C, and the seating surface foreign object detection unit 18D.

[0056] For example, images of the exposed surfaces 53 and 63 of the universal molds 52 and 62 are transmitted from cameras 40A and 40B to the molding surface color change detection unit 18B, the molding surface foreign object detection unit 18C, and the seating surface foreign object detection unit 18D. Algorithms for identifying the molding surfaces 52A and 62A and the seating surfaces 52B and 62B are installed in these detection units. For example, an SSD (Single Shot multibox Detector) is installed in these detection units as the identification algorithm.

[0057] In the molding surface discoloration detection unit 18B, the pixel values ​​of the image areas of molding surfaces 52A and 62A are input to the input layer. The discoloration retention rate R_cc is then output from the output layer. In the molding surface foreign object detection unit 18C, the pixel values ​​of the image areas of molding surfaces 52A and 62A are input to the input layer. The foreign object retention rate R_co is then output from the output layer. Furthermore, in the seating surface foreign object detection unit 18D, the pixel values ​​of the image areas of seating surfaces 52B and 62B are input to the input layer. The foreign object retention rate R_so is then output from the output layer.

[0058] As described later, the discoloration residue rate R_cc and foreign matter residue rate R_co of the molding surfaces 52A and 62A, and the foreign matter residue rate R_so of the sitting surfaces 52B and 62B are used as parameters to monitor the progress of the cleaning process of the general molds 52 and 62.

[0059] 5. General mold cleaning process

[0060] exist Figure 6 The flowchart illustrates the cleaning process for general-purpose molds 52 and 62. This process is performed when changing to special-purpose molds 54 and 64. When changing to special-purpose molds 54 and 64, the fixed mold 50 and the movable mold 60 are in the open state. Furthermore, as shown... Figure 1 As illustrated, special molds 54 and 64 are removed from general molds 52 and 62. Furthermore, the removed special molds 54 and 64 are cleaned by a cleaning device different from that of the cleaner 30.

[0061] When the special molds 54 and 64 are removed from the general molds 52 and 62, a removal completion notification is sent to the computer device 10 via the input device 17. Alternatively, if the replacement of the special molds 54 and 64 is performed automatically using a robot or the like, a removal completion notification can also be sent to the computer device 10 based on images captured by cameras 40A and 40B.

[0062] A notification indicating that disassembly is complete is sent to the camera control unit 18A and the robot control unit 18E. The robot control unit 18E sends a drive command to the robotic arm 20. The robotic arm 20 receives the drive command and moves the nozzle 25 between the universal molds 52 and 62.

[0063] When the nozzle 25 moves to a position opposite to the seating surfaces 52B and 62B, the robot control unit 18E designates the spray nozzle 25 with a spray port. Furthermore, the robot control unit 18E sprays cleaning fluid at a predetermined pressure from the designated spray port. This cleans the seating surfaces 52B and 62B (S10).

[0064] Cameras 40A and 40B capture images of the exposed surfaces 53 and 63 during cleaning. The captured images are sent to the foreign object detection unit 18D. As described above, the foreign object detection unit 18D extracts the image areas of the seating surfaces 52B and 62B from the captured images. Furthermore, the foreign object detection unit 18D calculates the foreign object residue rate R_so of the seating surfaces 52B and 62B. The calculated foreign object residue rate R_so is displayed on the display unit 16.

[0065] The foreign object detection unit 18D on the seating surface determines whether the calculated foreign object residue rate R_so is below a predetermined second threshold R_th2 (S12). If R_so > R_th2, the cleaning process returns to step S10. That is, the seating surfaces 52B and 62B are cleaned until the foreign object residue rate R_so becomes below the predetermined second threshold R_th2.

[0066] When the foreign matter residue rate R_so of the seating surfaces 52B and 62B falls below a predetermined second threshold R_th2, the seating surface foreign matter detection unit 18D extracts the image areas of the female connectors 52D and 62D from the captured image. Furthermore, the seating surface foreign matter detection unit 18D calculates the foreign matter residue rate R_cp of the female connectors 52D and 62D. The calculated foreign matter residue rate R_cp is displayed on the display unit 16.

[0067] The foreign object detection unit 18D on the seating surface determines whether the calculated foreign object residue rate R_cp is below a predetermined first threshold R_th1 (S14). If R_cp > R_th1, the cleaning process returns to step S10. That is, the female connectors 52D and 62D are cleaned until the foreign object residue rate R_cp becomes below the predetermined first threshold R_th1.

[0068] As shown in step S18 described later, the first threshold R_th1 is set as the acceptable value for the foreign matter residue rate of the molding surfaces 52A and 62A. By requiring the female connectors 52D and 62D to have the same cleanliness as the molding surfaces 52A and 62A, the connection between the female connectors 52D and 62D and the male connectors 54D and 64D can be performed smoothly.

[0069] When the foreign matter residue rate R_cp of the female connectors 52D and 62D falls below the first threshold R_th1, the robotic arm 20 moves the nozzle 25 to a position opposite to the molding surfaces 52A and 62A. Then, cleaning of the molding surfaces 52A and 62A begins (S16).

[0070] Cameras 40A and 40B capture images of the exposed surfaces 53 and 63 during cleaning. The captured images are sent to the molding surface discoloration detection unit 18B and the molding surface foreign matter detection unit 18C. As described above, the molding surface discoloration detection unit 18B and the molding surface foreign matter detection unit 18C extract image areas of the molding surfaces 52A and 62A from the captured images. Furthermore, the molding surface discoloration detection unit 18B calculates the discoloration residue rate R_cc of the molding surfaces 52A and 62A. Additionally, the molding surface foreign matter detection unit 18C calculates the foreign matter residue rate R_co of the molding surfaces 52A and 62A. The calculated discoloration residue rate R_cc and foreign matter residue rate R_co are displayed on the display unit 16.

[0071] The foreign matter detection unit 18C on the molding surface determines whether the calculated foreign matter residue rate R_co is below a predetermined first threshold R_th1 (S18). If R_co > R_th1, the cleaning process returns to step S14. That is, the molding surfaces 52A and 62A are cleaned until the foreign matter residue rate R_co becomes below the predetermined first threshold R_th1.

[0072] When the foreign matter residue rate R_co of the molding surfaces 52A and 62A falls below a predetermined first threshold R_th1, the molding surface discoloration detection unit 18B determines whether the calculated discoloration residue rate R_cc falls below a predetermined third threshold R_th3 (S20). If R_cc > R_th3, the cleaning process returns to step S14. That is, the molding surfaces 52A and 62A are cleaned until the discoloration residue rate R_cc falls below the predetermined third threshold R_th3. When the discoloration residue rate R_cc of the molding surfaces 52A and 62A falls below the third threshold R_th3, the cleaning process ends.

[0073] In the above cleaning process, the second threshold R_th2 for the foreign matter residue rate R_so of the seating surfaces 52B and 62B is set to a higher value than the first threshold R_th1 for the foreign matter residue rate R_co of the molding surfaces 52A and 62A. That is, the cleaning requirements for the seating surfaces 52B and 62B are lower than those for the molding surfaces 52A and 62A. For example, a value less than 1% is set as the first threshold R_th1 (R_th1 < 0.01). Furthermore, a value exceeding the first threshold R_th1 but less than 5% is set as the second threshold R_th2 (R_th1 < R_th2 < 0.05).

[0074] Furthermore, for the molding surfaces 52A and 62A, as shown in step S18, the presence or absence of discoloration is determined. On the other hand, for the seating surfaces 52B and 62B, the presence or absence of discoloration is not a factor in determining whether to clean them. In other words, regardless of whether there is discoloration, the seating surfaces 52B and 62B are cleaned until the foreign matter residue rate R_so falls below the second threshold R_th2.

[0075] Sealing surfaces 52B and 62B and molded part 70 (see reference) Figure 3 They do not contact each other. Therefore, compared to molding surfaces 52A and 62A, the impact on the quality of molded part 70 is relatively small. Thus, in Figure 6 In the cleaning process, the cleaning requirements for the seating surfaces 52B and 62B are less stringent than those for the forming surfaces 52A and 62A. This results in a shorter cleaning time.

[0076] Furthermore, due to the seating surfaces 52B and 62B being different from the molded part 70 (see reference) Figure 3 Since they do not come into contact, even if the seating surfaces 52B and 62B change color, it will not transfer to the molded part 70. Therefore, in Figure 6 In the cleaning process, discoloration of the seating surfaces 52B and 62B is not considered. This results in a reduction in cleaning time.

[0077] Symbol Explanation

[0078] 10…Computer device; 11…CPU (processor); 18A…Camera control unit; 18B…Molded surface discoloration detection unit; 18C…Molded surface foreign object detection unit; 18D…Sitting surface foreign object detection unit; 18E…Robot control unit; 20…Robotic arm; 25…Spray nozzle; 30…Washer; 40A, 40B…Camera; 50…Fixed mold; 52, 62…General purpose mold; 52A, 62A…Molded surface of general purpose mold; 52B… 62B…The sitting surface of a general-purpose mold; 52C, 62C…Cooling channels of a general-purpose mold; 52D, 62D…Female connectors; 53, 63…Exposed surfaces; 54, 64…Special-purpose molds; 54A, 64A…Forming surfaces of special-purpose molds; 54B, 64B…The sitting surface of a special-purpose mold; 54C, 64C…Cooling channels of a special-purpose mold; 54D, 64D…Male connectors; 60…Modible mold; 70…Molded product; 100…Die-casting device.

Claims

1. A die-casting apparatus, comprising: Universal molds are used for a variety of types of molded products; Specialized molds, which are changed according to the type of product being molded; A cleaner that cleans the general-purpose mold. The die-casting apparatus is characterized in that... During the replacement of the special mold, the cleaner cleans the exposed surface of the general mold from which the special mold has been removed. The exposed surface during the replacement includes a molding surface that contacts the molded article and a seating surface for the special mold to sit on. The cleaner cleans the molding surface until the foreign matter residue rate falls below a first threshold, and cleans the seating surface until the foreign matter residue rate falls below a second threshold. The foreign matter residue rate at the second threshold is higher than the foreign matter residue rate at the first threshold.

2. The die-casting apparatus as described in claim 1, wherein, A connector is provided on the seating surface to connect with the cooling channels of the special mold. The cleaner cleans the connector until the foreign matter residue rate falls below the first threshold.

3. The die-casting apparatus as described in claim 1, wherein, The cleaner cleans the molded surface until the discoloration residue rate falls below the third threshold and the foreign matter residue rate falls below the first threshold. Regardless of whether there is discoloration, the seating surface shall be cleaned until the foreign matter residue rate is below the second threshold.

4. A die-casting apparatus, comprising: Universal molds are used for a variety of types of molded products; Specialized molds, which are changed according to the type of product being molded; A cleaner for cleaning the general-purpose mold; A processor that controls the cleaner. The die-casting apparatus is characterized in that... During the replacement of the specialized mold, the processor causes the cleaner to clean the exposed surface of the general-purpose mold from which the specialized mold has been removed. The exposed surface during the replacement includes a molding surface that contacts the molded article and a seating surface for the special mold to sit on. The processor causes the cleaner to clean the molding surface until the foreign matter residue rate falls below a first threshold, and causes the cleaner to clean the seating surface until the foreign matter residue rate falls below a second threshold. The foreign matter residue rate at the second threshold is higher than the foreign matter residue rate at the first threshold.

5. The die-casting apparatus as described in claim 4, wherein, A connector is provided on the seating surface to connect with the cooling channels of the special mold. The processor causes the cleaner to perform cleaning of the connector until the foreign matter residue rate becomes below the first threshold.

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