A three-dimensional printing method, a control unit and a three-dimensional printing system

Abstract

The application discloses a three-dimensional printing method, a control unit and a three-dimensional printing system. The three-dimensional printing method comprises the following steps: obtaining the stop positions of a spraying unit along an X-axis direction, a powder spreading unit along a Y-axis direction and a powder feeding unit after unexpected stop and start again; and performing a homing process of a motion mechanism according to the stop positions of the spraying unit, the powder spreading unit and the powder feeding unit to control the homing of the spraying unit, the powder spreading unit and the powder feeding unit. The control unit and the three-dimensional printing system are used to realize the three-dimensional printing motion mechanism homing method. According to the technical scheme, interference that may occur in the process of returning to the initial positions of the spraying unit, the powder spreading unit and the powder feeding unit after unexpected stop and start again can be avoided, and thus the safety and reliability are higher than those of the prior art.

Description

Technical Field

[0001] This application relates to the field of 3D printing, specifically to a 3D printing method, a control unit, and a 3D printing system. Background Technology

[0002] In existing technologies, the 3D printing method using powder materials involves layering powder and then selectively sintering the printing material layer by layer using flux spraying, ultimately forming a 3D printed part. A 3D printing system employing this method typically includes a 3D printer and a printing platform suitable for attachment to the printer. The 3D printer includes an ejection unit, a flux spreading unit, a heating unit, and a temperature sensor. The ejection unit moves along the X-axis to eject flux, the flux spreading unit moves along the Y-axis above the printing platform to spread powder evenly onto the platform, and the heating unit heats the printing material above the platform. The temperature sensor typically uses a thermopile to obtain the surface temperature of the printing material. The motion mechanism of the printing platform attached to the 3D printer generally includes powder feeding units positioned on both sides of the upper part of the printing platform along the Y-axis. These powder feeding units rotate around a rotation axis extending along the X-axis to lift the printing material above the printing platform for the flux spreading unit to spread. 3D printing typically takes a long time, usually several hours or even more than ten hours. During the printing process, it is susceptible to interference from unpredictable factors, such as abnormal power outages or mechanical failures, which can cause unexpected printer shutdowns. After an unexpected shutdown, the spraying unit, powder spreading unit, and powder feeding unit will stop at their current positions due to the loss of power. Upon restarting, interference may occur during the return process of these units to their initial positions, potentially leading to component damage. Summary of the Invention

[0003] The purpose of this application is to overcome the aforementioned defects or problems in the prior art and to provide a 3D printing method, control unit, and 3D printing system that can avoid interference that may occur when the jetting unit, powder spreading unit, and powder feeding unit return to their initial positions after an unexpected shutdown and restart, thus making it safer and more reliable than the prior art.

[0004] To achieve the above objectives, the following technical solution is adopted: The first technical solution relates to a 3D printing method, which includes, upon restarting after an unexpected shutdown, acquiring the stopping positions of the jetting unit along the X-axis, the powder spreading unit along the Y-axis, and the powder delivery unit, and executing a motion mechanism return process to control the jetting unit, powder spreading unit, and powder delivery unit to return to their original positions. The motion mechanism return process includes the following steps: S1: Determine whether the stopping position of the jetting unit is in the printing area. If so, first control the jetting unit to return to the initial position, and then execute step S2; otherwise, execute step S3. S2: Determine whether the stopping position of the powder spreading unit is in the interference area. If so, first control the powder spreading unit to return to the initial position, and then control the powder feeding unit to return to the initial position; otherwise, first control the powder feeding unit to return to the initial position, and then control the powder spreading unit to return to the initial position. S3: Determine whether the stopping position of the powder spreading unit is in the interference area. If so, first control the powder spreading unit to return to the initial position, then control the powder feeding unit to return to the initial position, and finally control the spraying unit to return to the initial position; otherwise, first control the powder feeding unit to return to the initial position, then control the powder spreading unit to return to the initial position, and finally control the spraying unit to return to the initial position. The printing area is the area occupied by the powder spreading unit along the X-axis; the interference area is the area occupied by the powder feeding unit along the Y-axis.

[0005] The second technical solution is based on the first technical solution. When the machine is restarted after an unexpected shutdown, the surface temperature of the printing material is also acquired, and it is determined whether the surface temperature of the printing material reaches or exceeds a first threshold. If so, the motion mechanism return process is executed and the printing material is heated until the surface temperature of the printing material reaches a second threshold, and then 3D printing is continued. The second threshold is greater than the first threshold. Otherwise, only the motion mechanism return process is executed.

[0006] The third technical solution is based on the first or second technical solution, wherein the stopping positions of the spraying unit, the powder spreading unit, and the powder feeding unit are collected by an image sensor after the machine is turned on.

[0007] The fourth technical solution is based on the first or second technical solution, wherein the stopping positions of the spraying unit along the X-axis, the powder spreading unit along the Y-axis, and the powder feeding unit are collected by the position sensing unit after an unexpected stop and stored in a non-volatile memory. The position sensing unit and the non-volatile memory are powered by an independent power supply that is not affected by the unexpected stop.

[0008] The fifth technical solution relates to a control unit, which includes an input module, a storage module, an execution module, and an output module; the input module is used to acquire the stop positions of the jetting unit, the powder spreading unit, and the powder feeding unit; the storage module stores a computer program, which is executed by the execution module to implement the 3D printing method as described in the first technical solution, and the execution module is used to execute the computer program to generate control instructions; the output module is used to output control instructions to control the jetting unit, the powder spreading unit, and the powder feeding unit.

[0009] The sixth technical solution relates to a control unit, which includes an input module, a storage module, an execution module, and an output module; the input module is used to acquire the stop positions of the jetting unit, the powder spreading unit, and the powder feeding unit; the storage module stores a computer program, which is executed by the execution module to implement the 3D printing method as described in the second technical solution, and the execution module is used to execute the computer program to generate control instructions; the output module is used to output control instructions to control the heating unit, the jetting unit, the powder spreading unit, and the powder feeding unit.

[0010] The seventh technical solution relates to a 3D printing system, which includes a 3D printer and a printing platform suitable for attachment to the 3D printer; the 3D printer includes an ejection unit and a powder spreading unit; the printing platform includes a powder feeding unit; the 3D printer further includes: An independent power supply is provided to power the position sensing unit and non-volatile memory in the event of an unexpected shutdown. The position sensing unit is used to collect the stopping positions of the spraying unit along the X-axis, the powder spreading unit along the Y-axis, and the powder feeding unit after an unexpected shutdown. Non-volatile memory, used to store the stopping positions of the spraying unit (X-axis direction), the powder spreading unit (Y-axis direction), and the powder feeding unit, acquired by the position sensing unit; and The control unit, as described in the fifth technical solution, has its input module acquiring the stopping positions of the spraying unit along the X-axis, the powder spreading unit along the Y-axis, and the powder feeding unit from a non-volatile memory. The spraying unit, powder spreading unit, and powder delivery unit operate according to the control commands output by the output module.

[0011] The eighth technical solution relates to a 3D printing system, which includes a 3D printer and a printing platform suitable for attachment to the 3D printer; the 3D printer includes a heating unit, an ejection unit, and a powder spreading unit; the printing platform includes a powder feeding unit; the 3D printer further includes: An independent power supply is provided to power the position sensing unit and non-volatile memory in the event of an unexpected shutdown. The position sensing unit is used to collect the stopping positions of the spraying unit along the X-axis, the powder spreading unit along the Y-axis, and the powder feeding unit after an unexpected shutdown. Non-volatile memory is used to store the stopping positions of the spraying unit in the X-axis direction, the powder spreading unit in the Y-axis direction, and the powder feeding unit, which are collected by the position sensing unit. A temperature sensor is used to obtain the surface temperature of the printing material; and The control unit, as described in the sixth technical solution, has its input module acquiring the stopping positions of the jetting unit along the X-axis, the powder spreading unit along the Y-axis, and the powder feeding unit from a non-volatile memory, and acquiring the surface temperature of the printing material from a temperature sensor. The heating unit, spraying unit, powder spreading unit, and powder feeding unit operate according to the control commands output by the output module.

[0012] The ninth technical solution is based on the seventh or eighth technical solution, wherein the independent power supply is a capacitor; the position sensing unit includes a first sensor for acquiring the stopping position of the spraying unit along the X-axis, a second sensor for acquiring the stopping position of the powder spreading unit along the Y-axis, and a third sensor for acquiring the stopping position of the powder feeding unit.

[0013] The tenth technical solution is based on the ninth technical solution, wherein the first sensor is a magnetic grating ruler extending along the X-axis direction; the second and third sensors are both encoders of DC motors.

[0014] Compared with existing technologies, the above solution has the following beneficial effects: In the first, fifth, and seventh technical solutions, if the jetting unit is stopped in the printing area, the jetting unit is first controlled to return to its original position. This avoids interference between the toner spreading unit and the jetting unit caused by the jetting unit returning to its original position when the jetting unit is stopped in the printing area. If the toner spreading unit is stopped in the interference area, the toner spreading unit is first controlled to return to its initial position. This avoids interference between the jetting unit and the toner spreading unit caused by the jetting unit returning to its original position when the toner spreading unit is stopped in the interference area. If the toner spreading unit is not stopped in the interference area, the toner delivery unit is first controlled to return to its initial position. This avoids interference between the toner spreading unit and the toner delivery unit caused by the toner spreading unit returning to its original position. Therefore, the first, fifth, and seventh technical solutions can avoid interference between the jetting unit, toner spreading unit, and toner delivery unit when restarting after an unexpected shutdown, as they do not interfere with each other during the return process. This makes them safer and more reliable than existing technologies.

[0015] In the second, sixth, and eighth technical solutions, the decision to continue 3D printing is based on whether the surface temperature of the printing material reaches a first threshold. This first threshold refers to the temperature at which cracks will occur on the surface of the printing material when it drops below this threshold, causing a shift in the already printed portion. If the surface temperature of the printing material does not reach the first threshold, the conditions for continuing 3D printing are not met. If the surface temperature of the printing material reaches the first threshold, a motion mechanism return process is executed, and the printing material is heated until its surface temperature reaches a second threshold before continuing 3D printing. This avoids the waste of printing material and inefficiency caused by unexpected short-term shutdowns that could terminate the printing process. Therefore, compared to existing technologies, this approach can avoid waste of printing material and improve printing efficiency while ensuring print quality.

[0016] In the third technical solution, the stopping positions of the spraying unit, the powder spreading unit, and the powder feeding unit are collected by the image sensor after power-on, which can avoid modifying the hardware of the 3D printer. Only the control logic needs to be improved to achieve the first technical solution.

[0017] In the fourth, seventh, and eighth technical solutions, the position sensing unit and the non-volatile memory are powered by an independent power supply, enabling the position sensing unit and the non-volatile memory to collect and store the shutdown positions of the spraying unit, the powder spreading unit, and the powder feeding unit after an unexpected shutdown, and the shutdown position is determined more accurately.

[0018] In the tenth technical solution, the stopping position of the spraying unit along the X-axis is sensed by a magnetic grating ruler, resulting in more accurate position sensing. The stopping positions of the powder spreading and feeding units are sensed by the encoder of the DC motor, eliminating the need for additional sensors and reducing costs. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments, the accompanying drawings used are briefly described below: Figure 1 This is a schematic diagram of the 3D printing system in Example 1; Figure 2 This is a schematic diagram of the motion mechanism of the 3D printing system in Example 1.

[0020] Figure 3 This is a schematic diagram of the motion mechanism's return-to-position process in Example 1; Explanation of key figure labels: 1. 3D printing system; 2. 3D printer; 3. Printing platform; 4. Injection unit; 5. Powder spreading unit; 6. Powder feeding unit; 7. Heating unit; 8. Temperature sensor. Detailed Implementation

[0021] Unless otherwise specified, the terms “first,” “second,” or “third,” etc., in the claims and description are used to distinguish different objects and not to describe a particular order.

[0022] Unless otherwise specified, in the claims and description, the terms “center,” “lateral,” “longitudinal,” “horizontal,” “vertical,” “top,” “bottom,” “inner,” “outer,” “upper,” “lower,” “front,” “rear,” “left,” “right,” “clockwise,” “counterclockwise,” etc., indicating orientation or positional relationship, are based on the orientation and positional relationship shown in the drawings and are only for the purpose of simplifying the description, and do not imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation.

[0023] Unless otherwise specified in the claims and description, the terms "fixed connection" or "fixed connection" shall be interpreted broadly to mean any connection in which there is no displacement or relative rotation relationship between the two parties, including non-removable fixed connection, detachable fixed connection, integral connection, and fixed connection by other means or components.

[0024] Unless otherwise specified, in the claims and description, the terms "comprising," "having," and variations thereof mean "including but not limited to."

[0025] In the claims and description, unless otherwise specified, the term "have" means that a technical feature that follows is part of a technical feature that precedes it.

[0026] The technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings.

[0027] Example 1 See Figure 1 and Figure 2 , Figure 1 and Figure 2 The structure of the 3D printing system 1 and the structure of its motion mechanism are shown. For example... Figure 1 As shown, the 3D printing system 1 in this embodiment includes a 3D printer 2 and a printing platform 3. The printing platform 3 is movable relative to the 3D printer 2 and is adapted to be attached to the 3D printer 1 and powered and controlled by the 3D printer 1.

[0028] like Figure 2 As shown, the printing platform 3 includes two powder feeding units 6 on both sides of its upper surface along the Y-axis direction. Each powder feeding unit 6 rotates about a rotation axis extending along the X-axis direction to lift the printing material onto the printing platform 3.

[0029] like Figure 1 and Figure 2As shown, in this embodiment, the 3D printer 1 includes an ejection unit 4, a powder spreading unit 5, a heating unit 7, a temperature sensor 8, and independent power supply, position sensing unit, non-volatile memory, and control unit (not shown in the figure).

[0030] The jetting unit 4 moves along the X-axis to selectively jet flux onto the upper surface of the printing platform 3. The powder spreading unit 5 moves above the printing platform 3 along the Y-axis to spread the printing material onto the printing platform 3. The jetting unit 4, the powder spreading unit 5, and the powder feeding unit 6 together constitute the motion mechanism of the 3D printing system 1.

[0031] The heating unit 7 is located above the printing platform 3 and is used to heat the printing material on the upper surface of the printing platform 3. In this embodiment, a heating lamp array is used.

[0032] Temperature sensor 8 is used to obtain the surface temperature of the printing material; in this embodiment, a thermopile is used.

[0033] An independent power supply is used to power the position sensing unit and non-volatile memory after an unexpected shutdown; in this embodiment, a capacitor is used.

[0034] The position sensing unit is used to collect the stopping positions of the spraying unit 4 along the X-axis, the powder spreading unit 5 along the Y-axis, and the powder feeding unit 6 after an unexpected shutdown. Specifically, the position sensing unit includes a first sensor for collecting the stopping position of the spraying unit 4 along the X-axis, a second sensor for collecting the stopping position of the powder spreading unit 5 along the Y-axis, and a third sensor for collecting the stopping position of the powder feeding unit 6. In this embodiment, the first sensor is a magnetic grating ruler extending along the X-axis; the second and third sensors are both encoders of a DC motor.

[0035] The non-volatile memory is used to store the stopping positions of the spraying unit 4 along the X-axis, the powder spreading unit 5 along the Y-axis, and the powder feeding unit 6, which are collected by the position sensing unit after an unexpected shutdown.

[0036] The control unit includes an input module, a storage module, an execution module, and an output module.

[0037] Specifically, the input module is used to obtain the stopping positions of the jetting unit 4 along the X-axis, the powder spreading unit 5 along the Y-axis, and the powder feeding unit 6 from the non-volatile memory after power-on, and to obtain the surface temperature of the printing material from the temperature sensor 8.

[0038] The storage module stores a computer program. This computer program is executed by the execution module to implement a 3D printing method. The 3D printing method will be described in detail later. The execution module executes the computer program to generate control instructions. The output module outputs the control instructions to control the heating unit, spraying unit, powder spreading unit, and powder feeding unit. The heating unit, spraying unit, powder spreading unit, and powder feeding unit operate according to the control instructions output by the output module.

[0039] The 3D printing method in this embodiment includes: upon restarting after an unexpected shutdown, obtaining the shutdown positions of the jetting unit 4 along the X-axis, the powder spreading unit 5 along the Y-axis, the powder feeding unit, and the surface temperature of the printing material from the input module. It then determines whether the surface temperature of the printing material reaches or exceeds a first threshold. If so, it executes a motion mechanism return process and heats the printing material until the surface temperature reaches a second threshold before continuing 3D printing. Of course, continuing 3D printing must be done after the motion mechanism return process is completed; otherwise, only the motion mechanism return process is executed. The second threshold is greater than the first threshold. In this embodiment, the first threshold is the temperature at which the surface of the printing material is prone to cracking, generally between 30-50 degrees Celsius. Within the range. The second threshold is the surface temperature of the printing material required for 3D printing, typically between 150-170°C. Within the range.

[0040] See Figure 3 , Figure 3 The repositioning process of the motion mechanism in this embodiment is illustrated. For example... Figure 3 As shown, the motion mechanism's return-to-position process includes the following steps: S1: Determine whether the stopping position of the jetting unit 4 is in the printing area. If so, first control the jetting unit 4 to return to the initial position, and then execute step S2; otherwise, execute step S3. S2: Determine whether the stopping position of the powder spreading unit 5 is in the interference area. If so, first control the powder spreading unit 5 to return to the initial position, and then control the powder feeding unit 6 to return to the initial position; otherwise, first control the powder feeding unit 6 to return to the initial position, and then control the powder spreading unit 5 to return to the initial position. S3: Determine whether the stopping position of the powder spreading unit 5 is in the interference area. If so, first control the powder spreading unit 5 to return to the initial position, then control the powder feeding unit 6 to return to the initial position, and finally control the spraying unit 4 to return to the initial position. Otherwise, first control the powder feeding unit 6 to return to the initial position, then control the powder spreading unit 5 to return to the initial position, and finally control the spraying unit 4 to return to the initial position. The printing area is the area occupied by the powder spreading unit 5 along the X-axis; the interference area is the area occupied by the powder feeding unit 6 along the Y-axis.

[0041] In this embodiment, the decision to continue 3D printing is based on whether the surface temperature of the printing material reaches a first threshold. If the surface temperature of the printing material does not reach the first threshold, the conditions for continuing 3D printing are not met. If the surface temperature of the printing material reaches the first threshold, the motion mechanism returns to its original position, and the printing material is heated until the surface temperature reaches a second threshold before continuing 3D printing. This avoids the waste of printing material and inefficiency caused by unexpected short-term shutdowns that could lead to the termination of the printing process. Therefore, compared to existing technologies, this method can avoid waste of printing material and improve printing efficiency while ensuring print quality.

[0042] In this embodiment, since the stopping position of the jetting unit 4 is in the printing area, the jetting unit 4 is controlled to return to its original position first, which can avoid interference between the powder spreading unit 5 and the jetting unit 4 caused by the powder spreading unit 5 returning to its original position when the stopping position of the jetting unit 4 is in the printing area.

[0043] In this embodiment, since the stopping position of the powder spreading unit 5 is in the interference region, the powder spreading unit 5 is first controlled to return to the initial position. This can prevent the spraying unit 4 from returning to its original position when the stopping position of the powder spreading unit 5 is in the interference region, thus avoiding interference between the spraying unit 4 and the powder spreading unit 5.

[0044] In this embodiment, since the powder spreading unit 5 is not in the interference area when it stops, the powder feeding unit 6 is first controlled to return to its initial position, which can avoid the powder spreading unit 5 interfering with the powder feeding unit 6 when it returns to its position.

[0045] Therefore, the technical solution of this embodiment can avoid interference between the spraying unit 4, the powder spreading unit 5 and the powder feeding unit 6 when restarting after an unexpected shutdown, thus making it safer and more reliable than the prior art.

[0046] In this embodiment, the position sensing unit and the non-volatile memory are powered by an independent power supply, so that the position sensing unit and the non-volatile memory can collect and store the shutdown position of the spraying unit 4, the powder spreading unit 5 and the powder feeding unit 6 after an unexpected shutdown, and the shutdown position is determined more accurately.

[0047] In this embodiment, the stopping position of the spraying unit 4 along the X-axis is sensed by a magnetic grating ruler, resulting in more accurate position sensing. The stopping positions of the powder spreading unit 5 and the powder feeding unit 6 are sensed by the encoder of the DC motor, eliminating the need for additional sensors and reducing costs.

[0048] Example 2 The main difference between Example 2 and Example 1 is that when the 3D printing system 1 is restarted after an unexpected shutdown, the input module no longer acquires the surface temperature of the printing material. The computer program stored in the storage module no longer determines whether the surface temperature of the printing material has reached the first threshold, nor does it continue to execute 3D printing. Of course, the computer program can still be executed to realize the motion mechanism's return process. Correspondingly, after the execution module executes the computer program, it no longer outputs control commands for controlling the heating unit.

[0049] Example 3 The difference between Embodiment 3 and Embodiment 1 is that the 3D printer 2 no longer includes an independent power supply, position sensing unit, and non-volatile memory. Instead, upon restarting after an unexpected shutdown, the controller uses existing image sensors in conventional 3D printers to acquire images, specifically the stopping positions of the jetting unit 4 (along the X-axis), the powder spreading unit 5 (along the Y-axis), and the powder delivery unit 6. The input module then uses the image sensors to acquire these stopping positions as well.

[0050] In this embodiment, the stopping positions of the spraying unit 4, the powder spreading unit 5, and the powder feeding unit 6 are collected by the image sensor after power-on. This avoids modifying the hardware of the 3D printer 2, and only requires improving the control logic to achieve the desired technical effect.

[0051] The description of the above specification and embodiments is used to explain the scope of protection of this application, but does not constitute a limitation on the scope of protection of this application.

Claims

1. A three-dimensional printing method, characterized in that, This includes, upon restarting after an unexpected shutdown, acquiring the stopping positions of the spraying unit along the X-axis, the powder spreading unit along the Y-axis, and the powder feeding unit, and executing a motion mechanism return process to control the spraying unit, powder spreading unit, and powder feeding unit to return to their original positions. The motion mechanism return process includes the following steps: S1: Determine whether the stopping position of the jetting unit is in the printing area. If so, first control the jetting unit to return to the initial position, and then execute step S2; otherwise, execute step S3. S2: Determine whether the powder spreading unit is in the interference zone when it stops. If so, first control the powder spreading unit to return to the initial position, and then control the powder feeding unit to return to the initial position. Otherwise, first control the powder feeding unit to return to the initial position, and then control the powder spreading unit to return to the initial position. S3: Determine whether the stopping position of the powder spreading unit is in the interference area. If so, first control the powder spreading unit to return to the initial position, then control the powder feeding unit to return to the initial position, and finally control the spraying unit to return to the initial position; otherwise, first control the powder feeding unit to return to the initial position, then control the powder spreading unit to return to the initial position, and finally control the spraying unit to return to the initial position. The printing area is the area occupied by the powder spreading unit along the X-axis; the interference area is the area occupied by the powder feeding unit along the Y-axis.

2. The three-dimensional printing method as described in claim 1, characterized in that, When the machine is restarted after an unexpected shutdown, the surface temperature of the printing material is also acquired, and it is determined whether the surface temperature of the printing material reaches or exceeds the first threshold. If so, the motion mechanism return process is executed and the printing material is heated until the surface temperature of the printing material reaches the second threshold, and then 3D printing is continued. The second threshold is greater than the first threshold; otherwise, only the motion mechanism return process is executed.

3. The three-dimensional printing method as described in claim 1 or 2, characterized in that, The stopping positions of the spraying unit, the powder spreading unit, and the powder delivery unit are collected by the image sensor after the machine is turned on.

4. The three-dimensional printing method as described in claim 1 or 2, characterized in that, The stopping positions of the spraying unit along the X-axis, the powder spreading unit along the Y-axis, and the powder feeding unit are collected by the position sensing unit after an unexpected shutdown and stored in a non-volatile memory. The position sensing unit and the non-volatile memory are powered by an independent power supply that is not affected by the unexpected shutdown.

5. A control unit, characterized in that, It includes an input module, a storage module, an execution module, and an output module; the input module is used to obtain the stop positions of the jetting unit, the powder spreading unit, and the powder feeding unit; the storage module stores a computer program, which is executed by the execution module to implement the 3D printing method as described in claim 1, and the execution module is used to execute the computer program to generate control instructions; the output module is used to output control instructions to control the jetting unit, the powder spreading unit, and the powder feeding unit.

6. A control unit, characterized in that, It includes an input module, a storage module, an execution module, and an output module; the input module is used to obtain the stop positions of the jetting unit, the powder spreading unit, and the powder feeding unit; the storage module stores a computer program, which is executed by the execution module to implement the 3D printing method as described in claim 2, and the execution module is used to execute the computer program to generate control instructions; the output module is used to output control instructions to control the heating unit, the jetting unit, the powder spreading unit, and the powder feeding unit.

7. A three-dimensional printing system comprising a three-dimensional printer and a printing platform adapted to be attached to the three-dimensional printer; The 3D printer includes an inkjet unit and a powder spreading unit; The printing platform includes a toner feeding unit; characterized in that the 3D printer further includes: An independent power supply is provided to power the position sensing unit and non-volatile memory in the event of an unexpected shutdown. The position sensing unit is used to collect the stopping positions of the spraying unit along the X-axis, the powder spreading unit along the Y-axis, and the powder feeding unit after an unexpected shutdown. Non-volatile memory, used to store the stopping positions of the spraying unit (X-axis direction), the powder spreading unit (Y-axis direction), and the powder feeding unit, acquired by the position sensing unit; and The control unit as described in claim 5, wherein the input module obtains the stopping positions of the spraying unit along the X-axis, the powder spreading unit along the Y-axis, and the powder feeding unit from a non-volatile memory; The spraying unit, powder spreading unit, and powder delivery unit operate according to the control commands output by the output module.

8. A three-dimensional printing system comprising a three-dimensional printer and a printing platform adapted to be attached to the three-dimensional printer; The 3D printer includes a heating unit, an ejection unit, and a powder spreading unit; The printing platform includes a toner feeding unit; characterized in that the 3D printer further includes: An independent power supply is provided to power the position sensing unit and non-volatile memory in the event of an unexpected shutdown. The position sensing unit is used to collect the stopping positions of the spraying unit along the X-axis, the powder spreading unit along the Y-axis, and the powder feeding unit after an unexpected shutdown. Non-volatile memory is used to store the stopping positions of the spraying unit in the X-axis direction, the powder spreading unit in the Y-axis direction, and the powder feeding unit, which are collected by the position sensing unit. A temperature sensor is used to obtain the surface temperature of the printing material; and The control unit as described in claim 6, wherein the input module obtains the stopping positions of the jetting unit along the X-axis, the powder spreading unit along the Y-axis, and the powder feeding unit from a non-volatile memory, and obtains the surface temperature of the printing material from a temperature sensor; The heating unit, spraying unit, powder spreading unit, and powder feeding unit operate according to the control commands output by the output module.

9. The three-dimensional printing system as described in claim 7 or 8, characterized in that, The independent power supply is a capacitor; the position sensing unit includes a first sensor for acquiring the stopping position of the spraying unit along the X-axis, a second sensor for acquiring the stopping position of the powder spreading unit along the Y-axis, and a third sensor for acquiring the stopping position of the powder feeding unit.

10. The three-dimensional printing system as described in claim 9, characterized in that, The first sensor is a magnetic scale extending along the X-axis; the second and third sensors are both encoders of DC motors.

Images