Rotational additive manufacturing device and control device

Abstract

Provided is a rotating additive manufacturing device comprising a table, feeder, heater, beam source, state information acquisition unit, and control unit. The control unit has: a stop operation unit that outputs, due to the input of abnormal state information, a first control signal to stop the irradiation of an electron beam; and a return operation unit that determines whether the abnormal state information relates to the state of a powder material, and if the abnormal state information relates to the state of the powder material, outputs a second control signal that controls at least one of a table rotation operation, a heater heating operation, and a feeder supply operation.

Description

[Technical field]

[0001] The present disclosure relates to a rotary additive manufacturing device and a control device. [Background technology]

[0002] Patent Document 1 discloses that, for an apparatus for manufacturing a three-dimensional object, a change in the temperature of a powder layer during manufacturing affects the quality of the product. Therefore, the manufacturing apparatus of Patent Document 1 selects an area of ​​the powder layer and designs an operation plan to maintain the temperature of the selected area.

[0003] Patent Document 2 discloses a three-dimensional modeling device. The three-dimensional modeling device of Patent Document 2 temporarily stops an operation of modeling a three-dimensional object, and then resumes the operation of modeling the three-dimensional object. More specifically, the three-dimensional modeling device of Patent Document 2 controls the discharge of a binder based on a situation after the operation is temporarily stopped. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 4639087 [Patent Document 2] JP 2017-119350 A Summary of the Invention [Problem to be solved by the invention]

[0005] The printing quality of a part manufactured by a rotary additive manufacturing device is affected by various factors during the manufacturing operation. For example, the printing quality is affected by the temperature distribution of the powder material. The printing quality is also affected by the surface condition of the powder material to which the energy beam is irradiated. In order to obtain the desired printing quality, it is necessary to maintain the powder material in a predetermined state. However, during the manufacturing operation, a situation may arise in which the manufacturing operation should not be continued for some reason. In a situation in which the manufacturing operation should not be continued, it becomes difficult to maintain a state in which the desired manufacturing quality can be obtained. As a result, it has been difficult to obtain a molded object that satisfies the desired manufacturing quality.

[0006] The present disclosure describes a rotational additive manufacturing layer and a control device for a rotational additive manufacturing device that can obtain a model that meets a desired modeling quality. [Means for solving the problem]

[0007] A rotary additive manufacturing apparatus according to an aspect of the present disclosure includes a table for rotating and supporting a powder material, a supply unit for supplying the powder material to the table, a heating unit for heating the powder material arranged on the table, an irradiation unit for irradiating the powder material arranged on the table with an energy beam, a state information acquisition unit for outputting abnormal state information including information on a state of the powder material arranged on the table and indicating a state in which irradiation of the energy beam should be stopped, and a control unit for controlling at least the irradiation unit based on the abnormal state information. The control unit includes a stop operation unit for outputting a first control signal for stopping irradiation of the energy beam due to input of the abnormal state information, and a return operation unit for determining whether the abnormal state information is information on the state of the powder material and, if the abnormal state information is information on the state of the powder material, outputting a second control signal for controlling at least one of the rotation operation of the table, the heating operation of the heating unit, and the supply operation of the supply unit. Effect of the Invention

[0008] A rotary additive manufacturing device and a control device according to an aspect of the present disclosure can obtain a molded object that satisfies a desired molding quality. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a diagram showing the configuration of a rotational layered manufacturing apparatus according to the first embodiment. [Diagram 2] 2 is a schematic diagram for explaining the positional relationship between the processing unit, the temperature information acquisition unit, and the table. Fig. 2(a) shows the state before the table is rotated, and Fig. 2(b) shows the state after the table is rotated. [Diagram 3] FIG. 3 is a block diagram showing the rotational additive manufacturing apparatus according to the first embodiment. [Figure 4] FIG. 4 is a timing chart for explaining the modeling retry. [Diagram 5] FIG. 5 is a flowchart showing an example of processing when an abnormality occurs in the rotational additive manufacturing apparatus according to the first embodiment. [Figure 6] FIG. 6 is a diagram showing the configuration of a rotational additive manufacturing apparatus according to the second embodiment. [Figure 7] FIG. 7 is a block diagram showing a rotary additive manufacturing apparatus according to the second embodiment. [Figure 8] FIG. 8 is a flowchart showing an example of processing when an abnormality occurs in the rotational additive manufacturing apparatus according to the second embodiment. [Figure 9] FIG. 9 is a diagram showing the configuration of a rotational layered manufacturing apparatus according to the third embodiment. [Figure 10] FIG. 10 is a block diagram showing a rotary additive manufacturing apparatus according to the third embodiment. [Figure 11] FIG. 11 is a flowchart showing an example of processing when an abnormality occurs in the rotational additive manufacturing apparatus according to the third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] A rotary additive manufacturing apparatus according to an aspect of the present disclosure includes a table for rotating and supporting a powder material, a supply unit for supplying the powder material to the table, a heating unit for heating the powder material arranged on the table, an irradiation unit for irradiating the powder material arranged on the table with an energy beam, a state information acquisition unit for outputting abnormal state information including information on a state of the powder material arranged on the table and indicating a state in which irradiation of the energy beam should be stopped, and a control unit for controlling at least the irradiation unit based on the abnormal state information. The control unit includes a stop operation unit for outputting a first control signal for stopping irradiation of the energy beam due to input of the abnormal state information, and a return operation unit for determining whether the abnormal state information is information on the state of the powder material and, if the abnormal state information is information on the state of the powder material, outputting a second control signal for controlling at least one of the rotation operation of the table, the heating operation of the heating unit, and the supply operation of the supply unit.

[0011] A control device according to one aspect of the present disclosure controls a three-dimensional printing device that uses a heating unit to heat powder material supplied from a supply unit onto a rotating table and irradiates an energy beam to form a three-dimensional object. The control device includes a stop operation unit that outputs a first control signal to stop irradiation of the energy beam due to input of abnormal state information including information about a state of the powder material arranged on the table and indicating a state in which the irradiation of the energy beam should be stopped, and a return operation unit that determines whether the abnormal state information is information about the state of the powder material and outputs a second control signal to control at least one of the rotation operation of the table, the heating operation of the heating unit, and the supply operation of the supply unit when the abnormal state information is information about the state of the powder material.

[0012] The rotary additive manufacturing device and the control device heat the powder material while rotating the table, and irradiate the powder material with an energy beam. The rotary additive manufacturing device and the control device stop the irradiation of the energy beam due to the input of the abnormal state information. When the abnormal state information is information regarding the state of the powder material, the rotary additive manufacturing device and the control device control at least one of the rotation operation of the table, the heating operation of the heating unit, and the supply operation of the supply unit. According to this configuration, when the state is such that the irradiation of the energy beam should be stopped, at least one of the rotation operation of the table, the heating operation of the heating unit, and the supply operation of the supply unit is controlled. As a result, even when the irradiation of the energy beam is stopped, it is possible to obtain a state required for the powder material in order to obtain a desired modeling quality. Therefore, a model that satisfies the desired modeling quality can be obtained.

[0013] The state information acquisition unit may include a smoke information acquisition unit that outputs smoke information for determining the presence or absence of powder material in a scattered state to the control unit as information regarding the state of the powder material. The recovery operation unit may output a signal for controlling the rotation operation of the table and the heating operation of the heating unit as a second control signal when the smoke information constituting the abnormal state information received from the state information acquisition unit indicates the occurrence of smoke. According to this configuration, when smoke is occurring, the rotation operation of the table and the heating operation of the heating unit are controlled. As a result, even if smoke is generated and the modeling operation is stopped, it is possible to obtain a state required for the powder material in order to obtain a desired modeling quality. Therefore, a model that satisfies the desired modeling quality can be obtained.

[0014] The state information acquisition unit may include an unevenness information acquisition unit that outputs unevenness information indicating the unevenness state of the surface of the powder material irradiated with the energy beam to the control unit as information regarding the state of the powder material. The return operation unit may output a signal for controlling the rotation operation of the table and the supply operation of the supply unit as the second control signal when the unevenness information constituting the abnormal state information received from the state information acquisition unit does not satisfy a predetermined unevenness condition. According to this configuration, when the unevenness state formed on the surface of the powder material does not satisfy the predetermined unevenness condition, the rotation operation of the table and the supply operation of the supply unit are controlled. As a result, even if the modeling operation is stopped, it is possible to obtain the state required for the powder material in order to obtain the desired modeling quality. Therefore, a modeled object that satisfies the desired modeling quality can be obtained.

[0015] The stopping operation unit may output a third control signal to further stop the rotation operation of the table, the heating operation of the heating unit, and the supply operation of the supply unit due to the input of the abnormal state information. The restoring operation unit may output a fourth control signal to resume at least one of the rotation operation of the table, the heating operation of the heating unit, and the supply operation of the supply unit when the abnormal state information is information regarding the state of the powder material. With this configuration, the rotation operation of the table, the heating operation of the heating unit, and the supply operation of the supply unit can also be further stopped in a state where the irradiation of the energy beam should be stopped.

[0016] The control unit may further include a restart operation unit that outputs a fifth control signal to start irradiating the energy beam when the abnormal state information satisfies a predetermined condition. With this configuration, it is possible to restart the modeling operation after confirming that a required state of the powder material has been secured in order to obtain a desired modeling quality. Therefore, a modeled object that satisfies the desired modeling quality can be obtained.

[0017] Hereinafter, a rotary additive manufacturing apparatus and a control apparatus according to the present disclosure will be described in detail with reference to the drawings. In each drawing, the same or corresponding parts are designated by the same reference numerals, and duplicated explanations will be omitted.

[0018] [First embodiment] FIG. 1 is a diagram showing a configuration of a rotary additive manufacturing apparatus (three-dimensional modeling apparatus) 1 according to the first embodiment. The rotary additive manufacturing apparatus 1 is a so-called 3D printer. The rotary additive manufacturing apparatus 1 manufactures a three-dimensional model (three-dimensional model) 3 from a powder material 2. The powder material 2 is a metal powder. The powder material 2 is, for example, a titanium-based metal powder, an Inconel powder, or an aluminum powder. The powder material 2 is not limited to a metal powder. The powder material 2 may be, for example, a resin powder, or a powder containing carbon fibers and resin such as CFRP (Carbon Fiber Reinforced Plastics). The powder material 2 may be other powders having electrical conductivity. The powder material 2 in the present disclosure is not limited to those having electrical conductivity. For example, when a laser is used as an energy beam, the powder material 2 may not have electrical conductivity.

[0019] The rotary additive manufacturing apparatus 1 employs a powder bed method in which an electron beam is applied to a spread powder material 2 to perform modeling. The rotary additive manufacturing apparatus 1 imparts energy to the powder material 2 by irradiating the powder material 2 with an electron beam. When the rotary additive manufacturing apparatus 1 imparts energy to the powder material 2, the temperature of the powder material 2 increases. As a result, the powder material 2 melts or sinters. When the rotary additive manufacturing apparatus 1 stops applying energy, the temperature of the powder material 2 decreases. As a result, the powder material 2 solidifies. The rotary additive manufacturing apparatus 1 forms a three-dimensional object 3 by repeatedly applying and stopping the application of energy multiple times.

[0020] The rotary additive manufacturing apparatus 1 comprises a driving unit (driving member) 4, a control unit (controller, control device) 5, a processing unit (processing member) 6, a status information acquisition unit 7, and a housing 8. The driving unit 4 realizes various operations required for modeling. The control unit 5 is responsible for controlling the entire rotary additive manufacturing apparatus 1. The processing unit 6 processes the powder material 2 to obtain a modeled object 3. The processing of the powder material 2 includes a supplying process of the powder material 2, a preheating process of the powder material 2, and a modeling process of the powder material 2. The status information acquisition unit 7 acquires information indicating various statuses related to modeling. The housing 8 forms a modeling space S. The modeling space S is an airtight space that can be decompressed for processing the powder material 2 by the processing unit 6. The housing 8 is supported by a plurality of columns 9.

[0021] A table 10 and a modeling tank 11 are arranged in the modeling space S. The table 10 rotatably supports the powder material 2. The table 10 has a disk shape, for example. The table 10 is arranged so that the central axis of the table 10 overlaps with the central axis of the housing 8. The table 10 has a modeling surface (main surface or upper surface) 10a and a back surface 10b. The powder material 2, which is the raw material of the model 3, is arranged on the modeling surface 10a. A drive unit 4 is connected to the back surface 10b. The modeling tank 11 is a container that contains the powder material 2. The modeling tank 11 is arranged to surround the table 10.

[0022] The drive unit 4 rotates and raises and lowers the table 10. The drive unit 4 has a rotation unit 12 and a lifting unit 13. The rotation unit 12 rotates the table 10 around the central axis of the table 10 as the rotation axis. The upper end of the rotation unit 12 is connected to the table 10. A drive source (e.g., a motor) is attached to the lower end of the rotation unit 12. The lifting unit 13 raises and lowers the table 10 relative to the modeling tank 11. The table 10 rises and lowers along the rotation axis of the rotation unit 12. The drive unit 4 may be any mechanism that can rotate, raise, and lower the table 10, and is not limited to the mechanism described above.

[0023] The control unit 5 controls the operations of the drive unit 4 and the processing unit 6. The control unit 5 receives abnormal state information from the state information acquisition unit .

[0024] The processing section 6 is disposed so as to face the table 10. For example, the processing section 6 is disposed above the table 10 and faces the modeling surface 10a of the table 10. The processing section 6 has a feeder 14, a heater (heating section) 15, and a beam source (irradiation section) 16. The feeder 14 performs a supply process of the powder material 2. The heater 15 performs a preheating process of the powder material 2. The beam source 16 performs a modeling process of the powder material 2.

[0025] The feeder 14 functions as a supply unit that supplies the powder material 2 to the table 10. For example, the feeder 14 has a raw material tank and a leveling unit. The raw material tank stores the powder material 2. The raw material tank supplies the powder material 2 to the table 10. The leveling unit levels the surface of the powder material 2 on the table 10. For example, the surface layer of the powder material 2 on the table 10 comes into contact with the leveling unit as the table 10 rotates and is spread and leveled. The rotational additive manufacturing device 1 may have a roller unit, a rod-shaped member, a brush unit, etc. instead of the leveling unit.

[0026] The heater 15 functions as a heating unit that heats the powder material 2 placed on the table 10. The heater 15 preheats the powder material 2 before it is irradiated with the electron beam. For example, the heater 15 increases the temperature of the powder material 2 by radiating heat. The heater 15 may be one that heats by other methods, for example, an infrared heater.

[0027] The beam source 16 functions as an irradiation unit that irradiates the powder material 2 placed on the table 10 with an electron beam. The beam source 16 is, for example, an electron gun. The electron gun generates an electron beam according to the potential difference generated between the cathode and the anode. The beam source 16 irradiates the powder material 2 with the electron beam.

[0028] The status information acquiring unit 7 outputs abnormal status information indicating a status in which the irradiation of the electron beam should be stopped. The abnormal status information includes information regarding the status of the powder material 2 arranged on the table 10. The status information acquiring unit 7 has a smoke information acquiring unit 71, an equipment information acquiring unit 73, and a temperature information acquiring unit 74.

[0029] The smoke information acquisition unit 71 outputs smoke information θ1 to the control unit 5 as information on the state of the powder material 2. The smoke information θ1 is used to determine whether or not the powder material 2 is in a scattered state. The powder material 2 is charged by irradiation with an electron beam. The charging of the powder material 2 may cause the powder material 2 to fly up in a mist. The phenomenon in which the powder material 2 fly up in a mist is called smoke. The smoke information θ1 indicates whether or not the powder material 2 is scattered to an extent that affects the modeling operation. The smoke information θ1 may be information that clearly indicates whether or not smoke is generated. The smoke information θ1 may be a measurement value that can be used as a judgment material for determining whether or not smoke is generated.

[0030] For example, the smoke information acquiring unit 71 may be an optical sensor. The smoke information acquiring unit 71 may acquire, as the smoke information θ1, the light intensity of a specific wavelength of the light emitted from the powder material 2.

[0031] When smoke is generated, electromagnetic waves (X-rays) having a specific wavelength are generated. The smoke information acquisition unit 71 may be a sensor that detects electromagnetic waves of a specific wavelength. For example, the smoke information θ1 output by the smoke information acquisition unit 71 includes information (1) indicating that smoke has been generated and information (0) indicating that smoke has not been generated. During the modeling operation, the smoke information acquisition unit 71 outputs information (0) indicating that smoke has not been generated. Then, when smoke is generated at a certain timing, the smoke information acquisition unit 71 outputs information (1) indicating that smoke is being generated.

[0032] The generation of smoke is influenced by various physical characteristics of the powder material 2. Examples of such characteristics include the capacitance of the powder material 2 or the electrical resistance of the powder material 2. The smoke information acquisition unit 71 may measure the characteristic value of the powder material 2 and output the measurement value obtained by the measurement. In this case, the smoke information θ1 is a measurement value. The measurement value does not directly indicate whether smoke is generated or not. However, the presence or absence of smoke generation can be determined by comparing the measurement value with a preset threshold value. The determination of whether smoke is generated or not may be performed by the smoke information acquisition unit 71 or by another component. When the determination of whether smoke is generated or not is performed by another component, the smoke information acquisition unit 71 outputs the measurement value as the smoke information θ1.

[0033] The smoke information acquisition unit 71 is not limited to the above-mentioned configuration as long as it can acquire the smoke information θ1.

[0034] The device information acquisition unit 73 detects a fault in the rotational additive manufacturing apparatus 1. The device information acquisition unit 73 outputs fault information θ3 as information related to the fault to the control unit 5. Examples of the fault information θ3 include an abnormality in the pressure in the modeling space S, a fault in the driving unit 4, a fault in the processing unit 6, and other abnormalities that require the continuation of the modeling process to be stopped.

[0035] The temperature information acquisition unit 74 measures the temperature of the printing surface 10a. The temperature information acquisition unit 74 outputs temperature information θ4 to the control unit 5 as information related to the temperature. For example, the temperature information acquisition unit 74 may be a thermocouple. The temperature information acquisition unit 74 may be attached to the back surface 10b of the table 10. The temperature information acquisition unit 74 may acquire the temperature information θ4 by other methods. The temperature information acquisition unit 74 may measure the temperature distribution of the printing surface 10a using, for example, an infrared camera. The temperature information acquisition unit 74 may acquire temperature information θ4 related to multiple measurement points. The temperature information θ4 may be multiple temperature values ​​related to the multiple measurement points. The temperature information θ4 may be a representative value obtained based on the multiple temperature values.

[0036] The operation of the rotary additive manufacturing apparatus 1 during modeling will be described with reference to Fig. 1. The lifting unit 13 moves the table 10 upward. The table 10 is disposed at a position above the modeling tank 11. The rotation unit 12 rotates the table 10.

[0037] The feeder 14 supplies the powder material 2 to the table 10. The surface of the supplied powder material 2 is smoothed by a recoater. The powder material 2 supplied by the feeder 14 moves as the table 10 rotates.

[0038] The heater 15 preheats the powder material 2 before it is irradiated with the electron beam. The powder material 2 is heated while rotating together with the table 10. The powder material 2 preheated by the heater 15 moves in accordance with the rotation of the table 10.

[0039] The beam source 16 irradiates the powder material 2 with an electron beam. As a result, the powder material 2 is melted or sintered, and the model 3 is formed.

[0040] The table 10 descends as the formation of the object 3 progresses. That is, the lifting unit 13 lowers the table 10. The descent of the table 10 may be synchronized with the rotation of the table 10, but does not have to be completely synchronized.

[0041] After the modeling of all layers is completed, the modeling of the object 3 is completed.

[0042] 2 is a schematic diagram for explaining the positional relationship between the processing unit 6, the temperature information acquisition unit 74, and the table 10. FIG. 2(a) shows the state before the table 10 rotates. The table 10 rotates in a rotation direction CW. The rotation direction CW is clockwise. The feeder 14, the heater 15, and the beam source 16 are arranged above the table 10 in this order along the rotation direction CW of the table 10.

[0043] The feeder 14 forms a supply area on the modeling surface 10a. The supply area is an area where the powder material 2 is supplied to the table 10 and leveled. The supply area has, for example, a rectangular shape with the longitudinal direction being the diameter direction (radial direction) of the table 10, but is not limited thereto.

[0044] The heater 15 forms a preheating area on the forming surface 10a. The preheating area is an area where the temperature of the powder material 2 is increased. The heater 15 heats the powder material 2 in the preheating area so that the temperature of the powder material 2 in the preheating area is higher than the temperature of the powder material 2 in the supply area. Such a heating process may be, for example, a process of presintering the powder material 2. Presintering is a state in which the powder materials 2 are diffused and bonded to each other at the minimum point by a diffusion phenomenon. As an example, the presintering temperature is more than half the melting point of the powder material 2. This is based on the fact that the diffusion phenomenon of the powder material 2 generally becomes active at more than half the melting point. For example, when the powder material 2 is titanium, the presintering temperature is 700°C or more and 800°C or less. The melting point of the titanium alloy is about 1500°C or more and 1600°C or less. When the powder material 2 is aluminum, the presintering temperature is 300°C. The melting point of aluminum is about 660°C. The preheating area has, for example, a fan-shaped shape, but is not limited thereto.

[0045] The beam source 16 forms a printing region on the printing surface 10a. The printing region is a region where the temperature of the powder material 2 is increased. The temperature of the powder material 2 heated in the printing region is higher than the temperature of the powder material 2 present in the preheating region. The temperature of the powder material 2 present in the printing region is a temperature at which a molded object 3 can be formed (sintering temperature or melting temperature). The beam source 16 irradiates a desired portion in the printing region while scanning the electron beam. The shape of the printing region is, for example, circular, but is not limited to this. The printing region may or may not coincide with the irradiation range (irradiable range) of the beam source 16.

[0046] The positional relationship between the supply region, the preheating region, and the modeling region corresponds to the positional relationship between the feeder 14, the heater 15, and the beam source 16. The supply region, the preheating region, and the modeling region may be formed in this order along the rotation direction CW. The areas occupied by the supply region, the preheating region, and the modeling region may be changed as appropriate.

[0047] The modeling surface 10a of the table 10 virtually includes four regions. The four regions are divided regions A1, A2, A3, and A4. In other words, the rotary additive manufacturing apparatus 1 has a plurality of divided regions. The divided regions A1, A2, A3, and A4 move with the rotation of the table 10.

[0048] The temperature information acquisition unit 74 may be attached to a plurality of locations on the rear surface 10b of the table 10. For example, the temperature information acquisition unit 74 has thermocouples 74a, 74b, 74c, and 74d. The thermocouples 74a, 74b, 74c, and 74d measure the temperatures of the divided regions A1, A2, A3, and A4, respectively. The thermocouple 74a is provided in the divided region A1. The thermocouple 74a measures the temperature of the divided region A1. The thermocouple 74b is provided in the divided region A2. The thermocouple 74b measures the temperature of the divided region A2. The thermocouple 74c is provided in the divided region A3. The thermocouple 74c measures the temperature of the divided region A3. The thermocouple 74d is provided in the divided region A4. The thermocouple 74d measures the temperature of the divided region A4. The temperature information acquisition unit 74 is fixed to the table 10. Therefore, the temperature information acquisition unit 74 moves with the rotation of the table 10. The thermocouples 74a, 74b, 74c, and 74d are fixed to the rear surface 10b of the table 10. Therefore, the temperatures output by the thermocouples 74a, 74b, 74c, and 74d are the temperatures of the rear surface 10b of the table 10. However, the rotational additive manufacturing apparatus 1 of this embodiment uses the temperature of the rear surface 10b of the table 10 as the temperature of the powder material 2 arranged thereover. For example, the rotational additive manufacturing apparatus 1 may use the temperatures obtained by the thermocouples 74a, 74b, 74c, and 74d as the temperature of the powder material 2. The rotational additive manufacturing apparatus 1 may convert the temperatures obtained by the thermocouples 74a, 74b, 74c, and 74d into the temperature of the powder material 2 using a previously obtained relational expression.

[0049] 2(b) shows a state after the table 10 has rotated. The positions of the feeder 14, the heater 15, and the beam source 16 do not change with the rotation of the table 10. The position of the temperature information acquisition unit 74 changes with the rotation of the table 10.

[0050] 3 is a block diagram showing a control unit (control device) 5 included in the rotational additive manufacturing apparatus 1 according to the first embodiment. The control unit 5 is a computer configured with hardware such as a CPU (Central Processing Unit), a ROM (Read Only Memory), and a RAM (Random Access Memory), and software such as a program stored in the ROM. The control unit 5 includes an input signal circuit, an output signal circuit, a power supply circuit, etc. The control unit 5 includes a calculation unit and a memory. The memory can store data necessary for various controls.

[0051] The control unit 5 may be electrically connected to the rotation unit 12, the lifting unit 13, the feeder 14, the heater 15, and the beam source 16. The control unit 5 controls at least the beam source 16 based on the abnormal state information. The control unit 5 can generate various control signals. The control unit 5 has a beam control unit 51, a feeder control unit 52, a heater control unit 53, a lifting control unit 54, a rotation control unit 55, a stop operation unit 56, a return operation unit 57, and a restart operation unit 58.

[0052] The beam control unit 51 controls the irradiation of the electron beam to melt or sinter the powder material 2. For example, the beam control unit 51 determines the start and end of the irradiation of the electron beam, the timing of the irradiation of the electron beam, the position of the irradiation of the electron beam, etc. The beam control unit 51 outputs an irradiation control signal φ1 for controlling the irradiation to the beam source 16. The beam source 16 operates in accordance with the irradiation control signal φ1.

[0053] The feeder control unit 52 performs supply control for supplying the powder material 2 to the table 10. For example, the feeder control unit 52 determines the timing for supplying the powder material 2 onto the table 10, the supply amount of the powder material 2, the operation of a recoater which is a leveling unit, and the like. For example, the feeder control unit 52 may control the force for pressing the recoater against the powder material 2, the angle of the recoater with respect to the surface of the powder material 2, and the like. The feeder control unit 52 outputs a supply control signal φ2 for supply control to the feeder 14. The feeder 14 operates in accordance with the supply control signal φ2.

[0054] The heater control unit 53 performs heating control to heat the powder material 2 placed on the table 10. For example, the heater control unit 53 determines the amount of heat to be applied to the powder material 2, etc. The operation of the heater control unit 53 may be determined by the amount of heat generated by the heater. The operation of the heater control unit 53 may be determined by the temperature of the heater itself. The amount of heat to be applied to the powder material 2 may be determined according to the material or type of the powder material 2, the rotation speed of the table 10, etc. The heater control unit 53 outputs a heating control signal φ3 to the heater 15 for performing heating control. The heater 15 operates according to the heating control signal φ3.

[0055] The lift control unit 54 performs lift control to raise or lower the table 10. For example, the lift control unit 54 determines the descent speed of the table 10. The lift control unit 54 outputs a lift control signal φ4 for performing lift control to the lift unit 13. The lift unit 13 operates in accordance with the lift control signal φ4.

[0056] The rotation control unit 55 performs rotation control to rotate the table 10. For example, the rotation control unit 55 determines the rotation speed and the like of the table 10. The rotation control unit 55 outputs a rotation control signal φ5 for performing the rotation control to the rotation unit 12. The rotation unit 12 operates in accordance with the rotation control signal φ5.

[0057] In response to the input of the abnormal state information, the stopping operation unit 56 outputs a first control signal Δ1 for stopping the irradiation of the electron beam to the beam control unit 51. The beam control unit 51 stops the irradiation of the electron beam in accordance with the first control signal Δ1.

[0058] The stopping operation unit 56 outputs a sixth control signal Δ6 to the lift control unit 54, which stops the ascent and descent of the table 10, due to the input of the abnormal state information. The lift control unit 54 stops the ascent and descent of the table 10 in accordance with the sixth control signal Δ6.

[0059] The recovery operation unit 57 judges whether or not the abnormal state information is information regarding the state of the powder material 2. When the abnormal state information is information regarding the state of the powder material 2, the recovery operation unit 57 outputs a second control signal Δ2 for controlling at least one of the rotation operation of the table 10, the heating operation of the heater 15, and the supply operation of the feeder 14.

[0060] For example, the return operation unit 57 may output a second control signal Δ2 to the rotation control unit 55 to continue the rotation operation of the table 10. The rotation control unit 55 continues the rotation operation of the table 10 in accordance with the second control signal Δ2. The return operation unit 57 may continue the rotation operation of the table 10 by not outputting the second control signal Δ2 to stop the rotation operation of the table 10.

[0061] For example, the recovery operation unit 57 may output a second control signal Δ2 to the heater control unit 53 to cause the heater 15 to continue the heating operation. The heater control unit 53 causes the heater 15 to continue the heating operation in accordance with the second control signal Δ2. The recovery operation unit 57 may cause the heater 15 to continue the heating operation by not outputting the second control signal Δ2 to stop the heating operation of the heater 15.

[0062] For example, the return operation unit 57 may output a second control signal Δ2 that stops the supply operation of the feeder 14 to the feeder control unit 52. The feeder control unit 52 stops the supply operation of the feeder 14 in accordance with the second control signal Δ2.

[0063] When the smoke information θ1 constituting the abnormal state information received from the state information acquisition unit 7 indicates the occurrence of smoke, the recovery operation unit 57 outputs, as the second control signal Δ2, a signal for controlling the rotation operation of the table 10 and the heating operation of the heater 15. Whether or not the smoke information θ1 indicates the occurrence of smoke may be determined by any of the smoke information acquisition unit 71, the stop operation unit 56, or the recovery operation unit 57.

[0064] When the abnormal state information satisfies a predetermined condition, the restart operation unit 58 outputs a fifth control signal Δ5 to the beam control unit 51 to start the irradiation of the electron beam. The beam control unit 51 starts the irradiation of the electron beam in accordance with the fifth control signal Δ5. The case when the abnormal state information satisfies the predetermined condition will be described later.

[0065] When the abnormal state information satisfies a predetermined condition, the restart operation unit 58 outputs a seventh control signal Δ7 to the lift control unit 54 to start the lift or lowering of the table 10. The lift control unit 54 starts the lift or lowering of the table 10 in accordance with the seventh control signal Δ7.

[0066] The stop operation unit 56 may output a third control signal Δ3 that further stops the rotation operation of the table 10, the heating operation of the heater 15, and the supply operation of the feeder 14 due to the input of the abnormal state information. For example, the stop operation unit 56 may output the third control signal Δ3 to the rotation control unit 55. The rotation control unit 55 that has received the third control signal Δ3 stops the rotation operation of the table 10 in accordance with the third control signal Δ3. The stop operation unit 56 may output the third control signal Δ3 to the heater control unit 53. The heater control unit 53 that has received the third control signal Δ3 stops the heating operation of the heater 15 in accordance with the third control signal Δ3. The stop operation unit 56 may output the third control signal Δ3 to the feeder control unit 52. The feeder control unit 52 that has received the third control signal Δ3 stops the supply operation of the feeder 14 in accordance with the third control signal Δ3.

[0067] The recovery operation unit 57 may output the fourth control signal Δ4 when the abnormal state information is information regarding the state of the powder material 2. The fourth control signal Δ4 resumes at least one of the rotation operation of the table 10, the heating operation of the heater 15, and the supply operation of the feeder 14.

[0068] For example, the return operation unit 57 may output a fourth control signal Δ4 for restarting the rotation operation of the table 10 to the rotation control unit 55. The rotation control unit 55 restarts the rotation operation of the table 10 in accordance with the fourth control signal Δ4.

[0069] For example, the recovery operation unit 57 may output a fourth control signal Δ4 to the heater control unit 53 to restart the heating operation of the heater 15. The heater control unit 53 restarts the heating operation of the heater 15 in accordance with the fourth control signal Δ4.

[0070] For example, the return operation unit 57 may output a fourth control signal Δ4 to the feeder control unit 52, which restarts the supply operation of the feeder 14. The feeder control unit 52 restarts the supply operation of the feeder 14 in accordance with the fourth control signal Δ4.

[0071] FIG. 4 is a timing chart for explaining a modeling retry. A modeling retry is a process performed to resume the modeling process. FIG. 4 shows an example of changes over time for the state of the device, the area being modeled, the rotational position of the modeling plate, the rotational speed of the modeling plate, the elevation position of the modeling plate, and the temperature of the modeling surface. The state of the device is the operating state of the rotary additive manufacturing device 1. The area being modeled is a divided area passing through the modeling area. The rotational position of the modeling plate is the rotation angle of the table 10. The rotational speed of the modeling plate is the rotational speed of the table 10. The elevation position of the modeling plate is the elevation position of the table 10. The temperature of the modeling surface is the temperature of the modeling surface 10a.

[0072] The rotation speed of the table 10 is constant. As the table 10 rotates, the divided areas A1, A2, A3, and A4 enter the printing region in this order and become the current printing area.

[0073] First, the divided area A1 enters the building area and becomes an area during building. While the powder material 2 in the divided area A1 is being irradiated with the electron beam, the table 10 continuously descends.

[0074] Next, the divided area A2 enters the printing area and becomes the area in the process of printing. As an example, assume that an abnormality (smoke) occurs in the rotary additive manufacturing apparatus 1 while the divided area A2 passes through the printing area. The control unit 5 receives abnormal state information from the status information acquisition unit 7. The control unit 5 outputs an irradiation control signal φ1 to the beam source 16 to stop the irradiation of the electron beam. The control unit 5 outputs a lift control signal φ4 to the lift unit 13 to stop the lifting of the table 10. In this case, it is not determined what type of abnormality the abnormal state information output by the status information acquisition unit 7 indicates. In other words, the control unit 5 stops the irradiation of the electron beam on the condition that the stop operation unit 56 of the control unit 5 receives the abnormal state information.

[0075] The control unit 5 starts a modeling retry when the smoke information θ1 constituting the abnormal state information indicates the occurrence of smoke. The above-mentioned stopping operation unit 56 does not judge the contents of the input abnormal state information. The recovery operation unit 57 judges what kind of abnormality the input abnormal state information indicates. Specifically, it judges whether the input abnormal state information is an abnormality related to the powder material 2. If the powder material 2 is abnormal, there is a possibility that the abnormal state can be recovered by the operation of at least one of the feeder 14, the heater 15, the lifting unit 13, and the rotation unit 12. In this case, the control unit 5 performs a modeling retry operation described later. The modeling retry operation refers to an operation that makes it possible to resume the modeling operation. If the powder material 2 is not abnormal, there is a low possibility that the abnormal state can be recovered by the operation of at least one of the feeder 14, the heater 15, the lifting unit 13, and the rotation unit 12. Therefore, in this case, the control unit 5 stops the entire operation of the rotational additive manufacturing device 1 as shown in steps S32, S34, and S35 described later.

[0076] For example, the return operation unit 57 performs a modeling retry by controlling the heater 15 and the rotation unit 12. As an example, the return operation unit 57 determines the heating operation of the heater 15 and the rotation operation of the table 10 so that the temperature information θ4 falls within the modeling restart temperature range. The modeling restart temperature range may be the preliminary sintering temperature of the powder material 2. For example, when the powder material 2 is titanium, the modeling restart temperature range is a preliminary sintering temperature of 700°C or more and 800°C or less. When the preliminary sintering temperature is reached, smoke is less likely to be generated. When the preliminary sintering temperature is reached, it can be determined that the smoke has been eliminated. The temperature information θ4 may be temperatures related to multiple measurement points. In this case, the return operation unit 57 may determine the operation of the heater 15 and the operation of the table 10 so that a part or all of the temperature information θ4 falls within the modeling restart temperature range. For example, the temperature of the heater 15 and the rotation speed of the table 10 during modeling may be maintained. The temperature of the heater 15 and the rotation speed of the table 10 during the build may be varied and set to other values.

[0077] During the modeling retry, the beam source 16 stops emitting the electron beam. Meanwhile, the heating operation of the heater 15 and the rotation operation of the table 10 continue. As the table 10 rotates, the divided areas A3 and A4 enter the modeling area in this order. After the table 10 rotates once, the divided area A1 again enters the modeling area.

[0078] The control unit 5 resumes the printing process when the abnormal state information satisfies a predetermined condition. Examples of the predetermined condition include that the temperature of the printing surface 10a is maintained at the printing resumption temperature, or that the area where smoke is generated (here, the divided area A2) has entered the printing area again. The control unit 5 outputs an irradiation control signal φ1 to the beam source 16 to start irradiating the electron beam. The control unit 5 outputs a lift control signal φ4 to the lift unit 13 to start lowering the table 10. The control unit 5 may output the irradiation control signal φ1 and the lift control signal φ4 simultaneously or at different timings.

[0079] FIG. 5 is a flowchart showing an example of a process executed by the rotational layered manufacturing device 1 according to the first embodiment when an abnormality occurs.

[0080] The control unit 5 receives the abnormal state information from the state information acquisition unit 7 (step S10).

[0081] The control unit 5 stops the irradiation of the electron beam (step S12). The control unit 5 outputs an irradiation control signal φ1 to the beam source 16. Upon receiving the irradiation control signal φ1, the beam source 16 stops the irradiation of the electron beam.

[0082] The control unit 5 stops the ascent or descent of the table 10 (step S14). The control unit 5 outputs a lift control signal φ4 to the lift unit 13. The lift unit 13 receives the lift control signal φ4 and stops the descent of the table 10.

[0083] The control unit 5 stops the supply of the powder material 2 (step S16). The control unit 5 outputs a supply control signal φ2 to the feeder 14. The feeder 14 receives the supply control signal φ2 and stops the supply of the powder material 2.

[0084] The control unit 5 determines whether or not a modeling retry is possible (step S18). The control unit 5 determines that a modeling retry is possible when the abnormal state information is smoke information θ1. The control unit 5 determines that a modeling retry is impossible when the abnormal state information is failure information θ3. If a modeling retry is possible (YES in step S18), the process proceeds to step S20. If a modeling retry is impossible (NO in step S18), the process proceeds to step S32.

[0085] The control unit 5 starts the electron gun (step S20). The control unit 5 outputs an irradiation control signal φ1 to the beam source 16 to start the electron gun. Starting the electron gun means putting the electron gun into a state in which it is possible to irradiate an electron beam. In other words, in step S20, the beam source 16 does not irradiate an electron beam.

[0086] The control unit 5 controls the heating operation of the heater 15 and the rotation operation of the table 10 (step S22). The control unit 5 outputs a rotation control signal φ5 to the rotation unit 12. Upon receiving the rotation control signal φ5, the rotation unit 12 continues the rotation operation of the table 10. The control unit 5 outputs a heating control signal φ3 to the heater 15. Upon receiving the heating control signal φ3, the heater 15 continues the heating operation.

[0087] The control unit 5 determines whether the printing surface temperature satisfies the printing restart condition (step S24). In one example, when the temperature information θ4 is included in the printing restart temperature range, the control unit 5 determines that the printing restart condition is met. When the temperature information θ4 is not included in the printing restart temperature range, the control unit 5 determines that the printing restart condition is not met. When the printing restart condition is met (YES in step S24), the process proceeds to step S26. When the printing restart condition is not met (NO in step S24), the process returns to step S22.

[0088] The control unit 5 resumes the supply of the powder material 2 (step S26). The control unit 5 outputs a supply control signal φ2 to the feeder 14. Upon receiving the supply control signal φ2, the feeder 14 resumes the supply of the powder material 2.

[0089] The control unit 5 resumes the irradiation of the electron beam (step S28). The control unit 5 outputs an irradiation control signal φ1 to the beam source 16. Upon receiving the irradiation control signal φ1, the beam source 16 resumes the irradiation of the electron beam.

[0090] The control unit 5 resumes raising and lowering the table 10 (step S30). The control unit 5 outputs a lift control signal φ4 to the lift unit 13. Upon receiving the lift control signal φ4, the lift unit 13 resumes raising and lowering the table 10.

[0091] The control unit 5 stops the rotation of the table 10 (step S32). The control unit 5 outputs a rotation control signal φ5 to the rotation unit 12. The rotation unit 12 receives the rotation control signal φ5 and stops the rotation of the table 10.

[0092] The control unit 5 stops the heating operation of the heater 15 (step S34). The control unit 5 outputs a heating control signal φ3 to the heater 15. Upon receiving the heating control signal φ3, the heater 15 stops the heating operation.

[0093] The control unit 5 interrupts the formation process (Step S36).

[0094] The rotary additive manufacturing apparatus 1 and the control unit 5 heat the powder material 2 while rotating the table 10 and irradiate the powder material 2 with an electron beam. The rotary additive manufacturing apparatus 1 and the control unit 5 stop the irradiation of the electron beam due to the input of the abnormal state information. When the abnormal state information is information about the state of the powder material 2, the rotary additive manufacturing apparatus 1 and the control unit 5 control at least one of the rotation operation of the table 10, the heating operation of the heater 15, and the supply operation of the feeder 14. According to this configuration, even in a state in which the irradiation of the electron beam should be stopped, at least one of the rotation operation of the table 10, the heating operation of the heater 15, and the supply operation of the feeder 14 is controlled. This makes it possible to suppress the increase in the temperature difference of the powder material 2 during the stop of modeling. As a result, it is possible to obtain a state required for the powder material 2 in order to obtain a desired modeling quality. In other words, it is possible to ensure the uniformity of the temperature required for the powder material 2 in order to obtain a desired modeling quality. As a result, it is possible to obtain a modeled object 3 that satisfies the desired modeling quality.

[0095] The state information acquisition unit 7 includes a smoke information acquisition unit 71 that outputs smoke information θ1 to the control unit 5 to determine the presence or absence of the powder material 2 in a scattered state as information on the state of the powder material 2. When the smoke information θ1 constituting the abnormal state information received from the state information acquisition unit 7 indicates the occurrence of smoke, the recovery operation unit 57 outputs a signal to control the rotation operation of the table 10 and the heating operation of the heater 15 as the second control signal Δ2. According to this configuration, when smoke is occurring, the rotation operation of the table 10 and the heating operation of the heater 15 are controlled. This makes it possible to suppress the expansion of the temperature difference of the powder material 2 during the stop of modeling. Furthermore, the modeling operation can be resumed in a state where the smoke is eliminated.

[0096] The stop operation unit 56 outputs a third control signal Δ3 that further stops the rotation operation of the table 10, the heating operation of the heater 15, and the supply operation of the feeder 14 due to the input of the abnormal state information. The return operation unit 57 outputs a fourth control signal Δ4 that resumes at least one of the rotation operation of the table 10, the heating operation of the heater 15, and the supply operation of the feeder 14 when the abnormal state information is information about the state of the powder material 2. According to this configuration, in a state in which the irradiation of the electron beam should be stopped, the rotation operation of the table 10, the heating operation of the heater 15, and the supply operation of the feeder 14 are also stopped. When the abnormal state information is information about the state of the powder material 2, at least one of these operations is resumed. This makes it possible to start only the operations necessary to resume modeling. Furthermore, it is possible to suppress the expansion of the temperature difference of the powder material 2 during the stop of modeling.

[0097] The control unit 5 further includes a restart operation unit 58 that outputs a fifth control signal Δ5 to start the irradiation of the electron beam when the abnormal state information satisfies a predetermined condition. This makes it possible to restart modeling while suppressing the influence on the quality of the modeled object 3.

[0098] [Second embodiment] 6 is a cross-sectional view of a rotary additive manufacturing apparatus 1A according to the second embodiment. The rotary additive manufacturing apparatus 1A according to the second embodiment differs from the rotary additive manufacturing apparatus 1 of the first embodiment in that it includes a concavo-convex information acquisition unit 72 instead of the smoke information acquisition unit 71 and the temperature information acquisition unit 74.

[0099] The status information acquisition unit 7A has an unevenness information acquisition unit 72 and an equipment information acquisition unit 73. The unevenness information acquisition unit 72 outputs unevenness information θ2 to the control unit 5A as information regarding the status of the powder material 2. The unevenness information θ2 indicates the unevenness state of the surface of the powder material 2 irradiated with the electron beam. For example, the unevenness information acquisition unit 72 may be a camera. The unevenness information acquisition unit 72 images the surface layer (coated surface) of the powder material 2 and acquires the roughness of the surface layer as the unevenness information θ2. The unevenness information acquisition unit 72 is not limited to the above-mentioned configuration as long as it is able to acquire the unevenness information θ2.

[0100] 7 is a block diagram showing a control unit (control device) 5A according to the second embodiment. When unevenness information θ2 constituting the abnormal state information received from the state information acquisition unit 7A does not satisfy a predetermined unevenness condition, the recovery operation unit 57 outputs a signal for controlling the rotation operation of the table 10 and the supply operation of the feeder 14 as a second control signal Δ2. Whether or not the unevenness information θ2 satisfies the predetermined unevenness condition may be determined by any of the unevenness information acquisition unit 72, the stop operation unit 56, or the recovery operation unit 57.

[0101] For example, the return operation unit 57 determines the rotation operation of the table 10 and the supply operation of the feeder 14 so that the unevenness information θ2 satisfies a predetermined unevenness condition. The predetermined unevenness condition is that the roughness of the surface layer of the powder material 2 is smaller than the thickness of one layer, but is not limited to this. As an example, the return operation unit 57 determines the supply amount of the powder material 2. Then, the return operation unit 57 adjusts the supply amount of the powder material 2 while continuing the rotation operation of the table 10. As a result, the roughness of the surface layer of the powder material 2 is adjusted.

[0102] Fig. 8 is a flowchart showing an example of processing when an abnormality occurs in the rotary layered manufacturing apparatus 1A according to the second embodiment. The processing flow of the rotary layered manufacturing apparatus 1A according to the second embodiment differs from the processing flow of the rotary layered manufacturing apparatus 1 according to the first embodiment in that the determination in step S18 is different. Furthermore, the processing flow of the rotary layered manufacturing apparatus 1A according to the second embodiment also differs from the processing flow of the rotary layered manufacturing apparatus 1 according to the first embodiment in that it includes steps S23, S25, and S27 instead of steps S24 and S26. In Fig. 8, explanations of steps that are the same as those in the processing flow of the rotary layered manufacturing apparatus 1 according to the first embodiment will be omitted.

[0103] The control unit 5A determines whether or not a modeling retry is possible (Step S18). The control unit 5A determines that a modeling retry is possible when the abnormal state information is unevenness information θ2. The control unit 5A determines that a modeling retry is impossible when the abnormal state information is failure information θ3. If a modeling retry is possible (YES in Step S18), the process proceeds to Step S20. If a modeling retry is impossible (NO in Step S18), the process proceeds to Step S32.

[0104] The control unit 5A resumes the supply of the powder material 2 (step S23). The control unit 5A outputs a supply control signal φ2 to the feeder 14. The feeder 14, which has received the supply control signal φ2, resumes the supply of the powder material 2.

[0105] The control unit 5A adjusts the supply amount of the powder material 2 (step S25). The control unit 5A outputs a supply control signal φ2 to the feeder 14. The feeder 14 receives the supply control signal φ2 and adjusts the supply amount of the powder material 2.

[0106] The control unit 5A determines whether or not the surface layer of the powder material 2 meets the modeling restart condition (step S27). In one example, the control unit 5A determines that the modeling restart condition is met when the unevenness information θ2 is less than the thickness of one layer. The thickness of one layer may be defined as the thickness of the modeled object that increases during one rotation of the table 10. The control unit 5A determines that the modeling restart condition is not met when the unevenness information θ2 is equal to or greater than the thickness of one layer. If the modeling restart condition is met (YES in step S27), the process proceeds to step S28. If the modeling restart condition is not met (NO in step S27), the process returns to step S25.

[0107] The rotary additive manufacturing apparatus 1A according to the second embodiment adjusts the unevenness of the powder material 2 while rotating the table 10 during modeling stop. The state information acquisition unit 7A includes an unevenness information acquisition unit 72. The unevenness information acquisition unit 72 outputs unevenness information θ2 indicating the unevenness of the surface of the powder material 2 irradiated with the electron beam to the control unit 5A as information on the state of the powder material 2. When the unevenness information θ2 constituting the abnormal state information received from the state information acquisition unit 7A does not satisfy a predetermined unevenness condition, the return operation unit 57 outputs a signal for controlling the rotation operation of the table 10 and the supply operation of the feeder 14 as the second control signal Δ2. According to this configuration, when the unevenness of the surface of the powder material 2 does not satisfy the predetermined unevenness condition, the rotation operation of the table 10 and the supply operation of the feeder 14 are controlled. This makes it possible to suppress the temperature difference of the powder material 2 from increasing during modeling stop. Furthermore, the unevenness of the surface of the powder material 2 can be adjusted.

[0108] The rotary layered manufacturing apparatus 1A according to the second embodiment also achieves the same effects as the rotary layered manufacturing apparatus 1 according to the first embodiment.

[0109] [Third embodiment] 9 is a cross-sectional view of a rotational additive manufacturing apparatus 1B according to the third embodiment. In the rotational additive manufacturing apparatus 1B according to the third embodiment, a status information acquisition unit 7B includes a smoke information acquisition unit 71, a concavo-convex information acquisition unit 72, a device information acquisition unit 73, and a temperature information acquisition unit 74.

[0110] 10 is a block diagram showing a control unit (control device) 5B according to the third embodiment. A recovery operation unit 57 outputs a second control signal Δ2 in response to information indicated by the smoke information θ1 or the unevenness information θ2.

[0111] Fig. 11 is a flowchart showing an example of processing when an abnormality occurs in the rotary additive manufacturing apparatus 1B according to the third embodiment. The rotary additive manufacturing apparatus 1B according to the third embodiment adjusts at least one of the temperature of the manufacturing surface 10a and the roughness of the surface layer of the powder material 2. For example, the rotary additive manufacturing apparatus 1B according to the third embodiment executes steps S25 and S27 after steps S22, S24, and S26. In Fig. 11, explanations of steps that are the same as those in the processing flows of the rotary additive manufacturing apparatuses 1 and 1A according to the first and second embodiments will be omitted.

[0112] The control unit 5B determines whether or not a modeling retry is possible (step S18). The control unit 5B determines that a modeling retry is possible when the abnormal state information is smoke information θ1 or unevenness information θ2. The control unit 5B determines that a modeling retry is impossible when the abnormal state information is failure information θ3. If a modeling retry is possible (YES in step S18), the process proceeds to step S20. If a modeling retry is impossible (NO in step S18), the process proceeds to step S32.

[0113] Control unit 5B controls the heating operation of heater 15 and the rotation operation of table 10 (step S22). Control unit 5B outputs a rotation control signal φ5 to rotation unit 12. Upon receiving the rotation control signal φ5, rotation unit 12 continues the rotation operation of table 10. Control unit 5B outputs a heating control signal φ3 to heater 15. Upon receiving the heating control signal φ3, heater 15 continues its heating operation.

[0114] The control unit 5B determines whether the printing surface temperature meets the printing restart condition (step S24). In one example, when the temperature information θ4 falls within the printing restart temperature range, the control unit 5B determines that the printing restart condition is met. When the temperature information θ4 does not fall within the printing restart temperature range, the control unit 5B determines that the printing restart condition is not met. When the printing restart condition is met (YES in step S24), the process proceeds to step S26. When the printing restart condition is not met (NO in step S24), the process returns to step S22.

[0115] The control unit 5B resumes the supply of the powder material 2 (step S26). The control unit 5B outputs a supply control signal φ2 to the feeder 14. The feeder 14, which has received the supply control signal φ2, resumes the supply of the powder material 2.

[0116] The control unit 5B adjusts the supply amount of the powder material 2 (step S25). The control unit 5B outputs a supply control signal φ2 to the feeder 14. The feeder 14 receives the supply control signal φ2 and adjusts the supply amount of the powder material 2.

[0117] The control unit 5B determines whether or not the surface layer of the powder material 2 meets the modeling restart condition (step S27). In one example, when the unevenness information θ2 is less than the thickness of one layer, the control unit 5B determines that the modeling restart condition is met. When the unevenness information θ2 is equal to or greater than the thickness of one layer, the control unit 5B determines that the modeling restart condition is not met. When the modeling restart condition is met (YES in step S27), the process proceeds to step S28. When the modeling restart condition is not met (NO in step S27), the process returns to step S25.

[0118] The rotary additive manufacturing apparatus 1B according to the third embodiment adjusts the temperature of the modeling surface 10a and the roughness of the surface layer of the powder material 2. The rotary additive manufacturing apparatus 1B according to the third embodiment also achieves the same effects as the rotary additive manufacturing apparatuses 1 and 1A according to the first and second embodiments.

[0119] The present disclosure is not limited to the above-described embodiment, and various modifications as described below are possible without departing from the gist of the present disclosure.

[0120] In FIG. 4, an example has been described in which the table 10 rotates once during the modeling retry. The table 10 may rotate any number of times until the modeling restart condition is met. In the embodiment, the powder material 2 is heated by the heater 15 during the modeling retry. An electron beam may be used as the heating source. In the embodiment, the modeling restart condition is the temperature of the modeling surface 10a or the roughness of the surface layer of the powder material 2. The modeling restart condition may be the heating time of the modeling surface 10a. [Explanation of symbols]

[0121] 1 Rotational additive manufacturing device (3D modeling device) 2 Powder material 3 Sculptures 4 Drive unit 5 Control unit (control device) 6 Processing section 7 Status information acquisition section 8. Housing 9 Column 10 Tables 11 Modeling tank 10a Modeling surface 10b back 12 Rotating Unit 13 Lifting unit 14 Feeder (supply section) 15 Heater (heating part) 16 Beam source (irradiation part) 51 Beam control section 52 Feeder control section 53 Heater control section 54 Lift control section 55 Rotation control section 56 Stop operation section 57 Return action part 58 Resume operation section 71 Smoke information acquisition unit 72 Concave / convex information acquisition unit 73 Device information acquisition section 74 Temperature information acquisition section A1,A2,A3,A4 divided area CW Rotation direction S Build space θ1 Smoke Information θ2 Unevenness information θ3 Fault information θ4 Temperature information φ1 Irradiation control signal φ2 supply control signal φ3 Heating control signal φ4 Lift / lower control signal φ5 Rotation control signal Δ1 First control signal Δ2 Second control signal Δ3 Third control signal Δ4 Fourth control signal Δ5 Fifth control signal Δ6 Sixth control signal Δ7 Seventh control signal

Claims

1. A table that rotatably supports the powder material; A supply unit that supplies the powder material to the table; A heating unit that heats the powder material placed on the table; an irradiation unit that irradiates the powder material placed on the table with an energy beam; a status information acquiring unit that outputs abnormal status information including information regarding a status of the powder material placed on the table and indicating a status in which the irradiation of the energy beam should be stopped; A control unit that controls at least the irradiation unit based on the abnormal state information, The control unit is a stop operation unit that outputs a first control signal to stop the irradiation of the energy beam due to the input of the abnormal state information; A rotational additive manufacturing device having a recovery operation unit that determines whether the abnormal condition information is information regarding the state of the powder material, and if the abnormal condition information is information regarding the state of the powder material, continues the rotation operation of the table and outputs a second control signal that controls the heating operation of the heating unit or the supply operation of the supply unit.

2. The state information acquisition unit includes a smoke information acquisition unit that outputs smoke information for determining whether or not the powder material is in a scattered state to the control unit as information regarding the state of the powder material, The rotary additive manufacturing device of claim 1, wherein the recovery operation unit outputs a signal for controlling the rotation operation of the table and the heating operation of the heating unit as the second control signal when the smoke information constituting the abnormal state information received from the state information acquisition unit indicates the occurrence of smoke.

3. the state information acquisition unit includes an unevenness information acquisition unit that outputs unevenness information indicating an uneven state of a surface of the powder material irradiated with the energy beam to the control unit as information regarding the state of the powder material, The rotary additive manufacturing device according to claim 1, wherein the recovery operation unit outputs, as the second control signal, a signal for controlling the rotation operation of the table and the supply operation of the supply unit when the unevenness information constituting the abnormal state information received from the state information acquisition unit does not satisfy a predetermined unevenness condition.

4. the stopping operation unit outputs a third control signal to further stop the rotation operation of the table, the heating operation of the heating unit, and the supply operation of the supply unit, due to the input of the abnormal state information; The rotational additive manufacturing device according to any one of claims 1 to 3, wherein the recovery operation unit outputs a fourth control signal to resume at least one of the rotation operation of the table, the heating operation of the heating unit, and the supply operation of the supply unit when the abnormal state information is information regarding the state of the powder material.

5. The rotary additive manufacturing device according to any one of claims 1 to 4, wherein the control unit further has a restart operation unit that outputs a fifth control signal to start irradiating the energy beam when the abnormal state information satisfies a predetermined condition.

6. A control device for controlling a three-dimensional modeling device that heats a powder material supplied from a supply unit onto a rotating table with a heating unit and forms a three-dimensional object by irradiating the powder material with an energy beam, comprising: a stop operation unit that outputs a first control signal to stop the irradiation of the energy beam due to input of abnormal state information including information about a state of the powder material arranged on the table and indicating a state in which the irradiation of the energy beam should be stopped; A control device comprising: a recovery operation unit that determines whether the abnormal state information is information regarding the state of the powder material, and if the abnormal state information is information regarding the state of the powder material, continues the rotation operation of the table and outputs a second control signal that controls the heating operation of the heating unit or the supply operation of the supply unit.

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