CN103978687B - A kind of application picosecond laser accurate temperature controlling 3D prints macromolecular material system - Google Patents

Abstract

The invention provides a system for applying picosecond lasers to realize 3D printing of polymer materials, which includes a laser system, a control system, an infrared temperature measuring device, and a feeding device. Through calibration, feedback, and laser power control to compensate for the temperature difference with the latest 3D printing job temperature, the temperature difference can be precisely controlled within ±0.5°C, effectively preventing warping and uneven processing of polymer materials during the 3D printing process.

Description

A 3D printing polymer material system with precise temperature control using picosecond laser

technical field

The invention relates to the field of laser 3D printing, in particular to a system for 3D printing polymer materials using picosecond lasers.

Background technique

3D printing technology is a new technology of laser rapid prototyping, a leap in laser application, and even known as the third industrial revolution. Laser 3D printing uses light-curing rapid prototyping technology to quickly print liquid or powder materials into originally designed objects. It integrates laser, machinery, control system. Materials currently available for laser 3D printing have covered polymers, metal powders, ceramics and their composites. Compared with metal and ceramic materials, polymer materials have lower surface energy, higher melt viscosity, lower forming temperature, lower laser power required, and no "balls" that appear during metal powder printing. transformation" effect. Therefore, polymer materials are most widely used in the field of SLS (SLS: Selective Laser Sintering).

However, polymer materials are sensitive to temperature, and the processable temperature of most polymer materials is between 200-300°C, and the processing temperature range is narrow. The processing temperature range of some polymer materials is close to the decomposition temperature of the polymer material itself. For example, the processable temperature range of PP (polypropylene) is 200-300°C, but its decomposition temperature is 310°C. The two temperature ranges are very close , and the thermal conductivity of polymer materials is low, which can easily lead to uneven processing effects and warping in actual processing. Moreover, the laser quickly loses a certain amount of energy to the polymer material during the rapid prototyping process, which leads to poor 3D printing effect due to insufficient temperature control accuracy of the actual polymer material in the 3D printing process, or warped parts. Warping, because warping is a common destructive phenomenon in the process of selective laser 3D printing of polymer materials. Therefore, it is of great significance to be able to provide precise temperature control for 3D printing of polymer materials.

Contents of the invention

In order to solve the phenomenon of warping and decomposition caused by poor temperature control in 3D printing due to the sensitive response of polymer materials in the background technology. The present invention provides a picosecond laser 3D printing polymer material system, which can correct and adjust the working temperature in real time according to the actual printing operation, so as to accurately control the working temperature of the polymer material. The system includes: a feeder, a laser system, a control system, a first infrared thermometer and a second infrared thermometer. Through the actual temperature measurement of the actual output temperature data of the preheating and the real-time 3D printing operation area, the actual measured temperature is compared with the set preheating temperature, and feedback is given when there is a large error. According to the feedback temperature difference, the preheating temperature adjustment can be changed or the output power of the picosecond laser can be adjusted to match the temperature of the 3D printing area with the optimal printing temperature of the material. Accurately control the temperature of the printing area of the 3D printing material to prevent uneven 3D printing and warping of the material. Its specific plan is:

The system is a 3D printing polymer material system that uses picosecond laser to precisely control the temperature. The system includes: laser system, feeder, control system, first infrared thermometer and second infrared thermometer; each component is connected as follows:

The first infrared thermometer is connected to the first temperature acquisition in the control system, and is used to monitor the preheating temperature of the output material of the feeder;

The second infrared thermometer is connected to the second temperature acquisition in the control system to monitor the real-time temperature of the picosecond laser 3D printing operation area;

The feeder is connected to the feed controller in the control system, which is used to preheat and convey the materials to be processed;

The laser system is connected to the laser controller in the control system, which includes a picosecond laser and a vibrating mirror. The function of the picosecond laser is to output the laser with corresponding indicators according to the instructions output by the laser controller to implement 3D printing operations. The function of the vibrating mirror is based on The printing output by the laser controller requires instructions to change the position of the laser beam output by the picosecond laser to implement fast 3D printing operations;

The control system is the core part of implementing picosecond laser precise temperature control 3D printing, including the first temperature acquisition, the second temperature acquisition, laser controller, feeding controller, calibrator and feedback and error reporting device.

Working with picosecond laser 3D printing, through calibration, feedback, and laser power control to compensate the temperature difference with the real-time temperature of the 3D printing job, the temperature difference can be precisely controlled within ±0.5°C.

The picosecond laser can be a fiber laser or a solid-state laser, the average output power of which is continuously adjustable between 1 and 100W, the minimum spot diameter of the output beam focused is less than 400μm, the repetition frequency is between 1 and 800MHz, and the pulse width is 1 ～500ps, the wavelength is between 266～2000nm, its power is adjusted by the laser controller in the control system; The laser controller controls it.

The error of the first infrared thermometer and the second infrared thermometer is ±1°C.

The first temperature collection is to collect the temperature data of the first infrared thermometer and send it to the calibrator; the second temperature collection is to collect the temperature data of the second infrared thermometer and send it to the calibrator In the device and feedback and error reporting device; the laser controller is connected to the laser system, which synchronously outputs commands to the picosecond laser and the galvanometer, to the output power of the picosecond laser, to the galvanometer to print the shape and speed of operation; the feeding controller Connect the feeder, and give instructions on the preheating temperature and output rate of the materials conveyed in it; the calibrator is connected with the first temperature acquisition and feeding controller, and the feeding controller will measure the preheating temperature of the material and the first infrared temperature Compared with the real-time preheating temperature data measured by the instrument, if the temperature difference exceeds 10°C, an instruction will be sent to the feedback and error reporting device; the feedback and error reporting device is connected to the calibrator, and the best printing temperature data of various materials are stored inside. value, and compare it with the temperature data in the calibrator in real time, once the temperature difference is greater than 10°C, an alarm will be given.

The feeder can uniformly preheat and convey the materials therein, the preheating temperature can be controlled at 100-500°C, the temperature control accuracy is ±5°C, and the conveying rate can be controlled at 0-2m/s.

In addition, the present invention utilizes the advantages of high peak power and high repetition frequency of picosecond lasers to accurately print polymer materials. Because the picosecond laser output pulse time is short, the single pulse energy is high, the diameter of the focused beam is small, and the pulse repetition frequency is MHz and above, it can realize rapid and precise processing of materials.

The beneficial effects of the present invention are as follows:

The present invention uses picosecond laser 3D printing to work, and utilizes the advantages of picosecond laser in the field of material processing. Because it has the advantages of high peak power, high repetition frequency, and high single pulse energy. Accurate and fast 3D printing operations can be implemented on polymer materials.

Monitor and feed back the preheating temperature of polymer materials and real-time printing working temperature. By monitoring the temperature of the polymer material preheating and real-time 3D printing working area in real time, the working temperature of 3D printing can be precisely controlled by adjusting the preheating temperature and the output power of the laser according to the prompt of the calibrator 35 . Its specific implementation is to calibrate the preheating temperature set by the feeder 1 through the calibrator 35 and measure the actual temperature of the actual output material, and then adjust the power of the laser through feedback to correct the temperature of the printing work, so that the polymer material is at the best Printing working temperature, accurate printing of polymer materials, the error range of controllable temperature is ±0.5°C. The above-mentioned double adjustment optimization is adopted to ensure precise temperature control and better prevent uneven sintering and warping that tend to occur during the 3D printing process of polymer materials.

During the printing process, the printing temperature can be corrected by timely correcting the output power of the laser through parameter comparison, which can be accurately controlled within the error range of ±0.5°C, effectively preventing uneven sintering and warping. If you are skilled in operating this system The temperature error can be reduced even lower. This system has intelligent protection measures, if the difference between the two sets of preset preheating temperature data in the calibrator and the measured preheating output temperature data is greater than 10°C. The machine can be set to stop the printing operation to ensure a high yield of 3D printing. If the temperature of the printing work area reaches the decomposition temperature of the polymer material, the system can automatically stop the printing operation in time by presetting the feedback and error reporting device 36, so as to eliminate the waste of materials when the 3D printing effect is not good.

Description of drawings

Figure 1 Schematic diagram of picosecond laser precise temperature control 3D printing polymer material system.

Figure 2. Schematic diagram of the control system.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings. However, those skilled in the art understand that the present invention is not limited to the following examples, and any improvements and changes made on the basis of the present invention are within the protection scope of the present invention. The implementation of the present invention will be described in detail below in conjunction with the accompanying drawings.

Refer to the picosecond laser precise temperature control 3D printing polymer material system shown in Figure 1, which includes:

Two infrared thermometers, wherein the first infrared thermometer 41 is connected to the first temperature acquisition 31 in the control system 3, and the temperature monitored is the preheating temperature of the material delivered by the feeder 1; wherein the second infrared thermometer 42 is connected to the second temperature acquisition 32 in the control system 3, and the temperature monitored by it is the temperature during the actual 3D printing operation. The temperature measurement range of the two infrared thermometers is 20-1000°C, and the error range is ±1°C.

A control system 3, as shown in Figure 2, the control system 3 is a key part of precise temperature control in the whole system. It includes two temperature acquisition components, the first temperature acquisition 31 is connected to the first infrared thermometer 41 , and the second temperature acquisition 32 is connected to the second infrared thermometer 42 . A calibrator 35, which compares the temperature collected by the second temperature collection 32 with the preheating temperature data of the feeder 1. If the difference between the two sets of temperature data exceeds 10°C, it means that the preheating step has not been completed or malfunctioned. The preset will make the 3D printing system not start the 3D printing operation; if the temperature difference data is less than 10°C, the subsequent printing operation steps will be carried out smoothly. A feedback and error reporting device 36, which is to print the characteristic parameters of the initially set printed material, including the name of the 3D printing material, the best printing temperature value, and the temperature threshold for its decomposition. If the first infrared thermometer 41 collects If the data is greater than the decomposition threshold of the printing material, the 3D printing system can be stopped by setting the feedback and error reporting device 36. If the data collected by the first infrared thermometer 41 deviates from the preset optimal printing temperature value by more than 5 ℃, the feedback and error reporting device 36 will give an alarm prompt. A laser controller 33 controls the picosecond laser 21 and the vibrating mirror 22 in the laser system 2 . A feed controller 34 controls the preheating of the feeder 1 and the speed of the belt 5 .

A laser system 2, which is connected to the laser controller 33 in the control system 3, which includes a picosecond laser 21 and a vibrating mirror 22. Wherein the picosecond laser 21 can be a fiber laser or a solid-state laser, the power of which is continuously adjustable between 1 and 100 W, and the minimum focused spot diameter is less than 400 μm. The repetition frequency is between 1-800MHz, the pulse width is between 1-500ps, and the wavelength is between 266-2000nm. The vibrating mirror 22 is a high-speed vibrating mirror, which is also controlled by a laser controller 33 .

A feeder 1, which is connected to the feed controller 34 in the control system 3, which can preheat the materials to be 3D printed, and the preheating temperature can be 0-500°C, with an error of ±5°C.

Before printing, put the polymer material into the feeder 1, set the preheating temperature through the feeding controller in the control system 3, and set the output speed of the material according to actual needs, and the polymer material will be transported out through the conveyor belt 5. At this time, the name of the polymer material and its printing temperature range, as well as the value of the decomposition temperature and the optimal 3D printing working temperature are input into the feedback and error reporting device 36 in the control system 3 . Calculate the required picosecond laser power according to the printing requirements and the speed of conveying materials. At the same time, the first infrared thermometer 41 and the second infrared thermometer 42 are set to be in working condition. The laser controller 33 in the control system 3 gives control commands to the vibrating mirror 22 for the preset printing parameters.

After reaching the preheating temperature, the feeder 1 will give a signal, and the feeding controller 34 in the control system 3 will receive the signal, indicating that the 3D printing operation can be started. The conveyor belt 5 transports the polymer material, and the temperature data collected by the second infrared thermometer 2 is transmitted to the second temperature collection 32 in the control system 3, and the data will be compared with the preset temperature. If the temperature difference is less than 10°C , the 3D printing operation can be carried out; if the temperature difference is greater than 10°C, it means that the preheating step is not done well, and the feedback and error reporting device 36 in the control system 3 will stop the system in time. The temperature measured by the second infrared thermometer 42 and the preset preheating temperature are less than 10°C, the picosecond laser starts to output the preset power printing job, and at the same time the first infrared thermometer 41 will monitor the temperature of the actual printing work area, If this value is less than 1°C from the optimal 3D printing value, keep the other parameters unchanged and continue the 3D printing operation. If it is found that the printing effect of the printed product is not ideal in practice, if the real-time 3D printing temperature is lower than the optimal matching temperature, there are two ways to accurately increase the 3D printing temperature, the first is to collect 32 according to the second temperature The temperature difference between the temperature data and the optimum printing temperature is adjusted by the feeding controller 34 to adjust the preheating temperature of the feeder 1 to compensate for the temperature difference; power to compensate for this temperature difference. After compensation, the preheating temperature of the feeder 1 and the output power of the picosecond laser 21 can be fine-tuned according to the actual situation, so as to achieve the best 3D printing temperature. Until the 3D printing effect is ideal. If the real-time 3D printing temperature is higher than the best matching temperature, the temperature difference can be reduced by reducing the preheating temperature of the feeder 1 or the output power of the picosecond laser 21 accordingly.

Example 1

Using picosecond laser precise temperature control 3D printing polymer material system shown in Figure 1, this embodiment takes picosecond laser 3D printing nylon 66 (polyamide 66) 1mm thick strip material as an example, and its processing temperature range is 270- 290°C, thermal decomposition temperature is greater than 350°C. The most stable processing temperature is around 280°C. The picosecond laser 21 used is a fiber laser with an output wavelength of 1064 nm, a pulse width of 30 ps, a repetition rate of 50 MHz, an average power continuously adjustable between 0 and 100 W, and a focused spot diameter of 250 μm. The vibrating mirror 22 is a high-speed vibrating mirror, and the set scanning speed is 0.2 m/s. Through the laser controller 33, it is set to continuously print small grids of 2*3mm on the long-sized nylon material, but the nylon 66 material is not pierced. Both infrared thermometers use IRT-1200D fast infrared thermometer, the temperature measurement range is -20～1200℃, and the measurement error is ±1℃.

Firstly, the preheating temperature is set to 280° C. by the feeding controller 34 , the optimum printing temperature set in the feedback and error reporting device 36 is 280° C., and the stop temperature is 350° C. A temperature difference greater than 20°C set in the calibrator stops the 3D printing job. The preset speed of the transmission belt 5 is 0.05m/s. According to its thermal conductivity of 0.34w/mk, heat capacity of 1.675kJ/(kg K), density of 1.12g/ ^cm3 and other parameters, the power of the laser is preliminarily estimated to be 0.5W That's it. However, the ambient temperature of the printing environment is 22°C and the humidity is 53RH%. The nylon delivered by the feeder 1 will have a certain temperature diffusion and cause its temperature to drop. When the output speed is 0.05m/s, the temperature measured by the first infrared thermometer 41 is 275.6°C, which is already in a molten state. It is compensated to 280°C through laser processing and needs to be increased to an average power output of 2.5W. At this time, the temperature monitored by the second infrared thermometer 42 is 280.3°C. It shows that it is in a better printing state, and the processing result is an ideal 3D printed product.

Example 2

Using the picosecond laser precise temperature control 3D printing polymer material system shown in Figure 1, this embodiment uses picosecond laser 3D printing polypropylene (PP) thermoplastic resin material. The PP material in its strip shape Φ5 is 3D printed and processed into regular particles. Because PP material has a large shrinkage rate (1% to 2.5%), it is easy to form depressions on the surface of thicker products. With general nanosecond or continuous light lasers, it is easy to accumulate heat on the surface of the material, and the depression phenomenon is difficult to eliminate. Therefore, the use of high-repetition-frequency picosecond laser 3D printing PP materials can be rapidly prototyped, and there is almost no heat accumulation on the surface of the material, which overcomes the phenomenon of surface depressions.

The picosecond laser 21 used is a fiber laser with an output wavelength of 1064 nm, a pulse width of 10 ps, a repetition rate of 100 MHz, an average power continuously adjustable between 0 and 100 W, and a focused spot diameter of 200 μm. The vibrating mirror 22 is a high-speed vibrating mirror, and the set scanning speed is 0.3m/s. The speed of the transmission belt is set to 0.15m/s. Through the laser controller 33, the vibrating mirror 22 is set to cut the strip-shaped PP material of Φ5 into plastic particles of Φ5*5. Both infrared thermometers use IRT-1200D fast infrared thermometer, the temperature measurement range is -20～1200℃, and the measurement error is ±1℃.

The 3D printing temperature of PP material is 200-300°C, and the best printing temperature of this material is 250°C. However, its thermal decomposition temperature is 310°C, which is very close to the printing temperature, so its precise temperature control is of great significance. The hot melt of PP polymer material is 1.8kJ/(kg K), the thermal conductivity is 0.12w/m·k, the melting point is 164-170°C, and the density is 0.90-0.91g/cm ³ . The ambient temperature during 3D printing is 26°C and the humidity is 55RH%. In order to prevent thermal decomposition during the 3D printing process, we set the preheating temperature of the feeder 1 to 250° C. in the feeding controller 36 to ensure that it is in a molten state during output. The initial picosecond output laser set by the laser controller 33 is 10W, its peak power is 10kW, and the single pulse energy is 0.1μJ. Fully able to cut PP material. Since the preset speed of the vibrating mirror 22 is 0.3m/s, the time for the picosecond laser to cut a PP strip of Φ5 is about 17ms, the energy output by the laser within 17ms is 170mJ, and the 200μm spot cuts the volume of the PP material scanned once The mass of the PP material in the 3D printing area is 3.5mg. According to its thermal melting parameters, the energy required to raise the 3.5mg PP material by one degree is ^6.3mJ . Theoretical calculations show that the laser energy can quickly heat the PP material by 20 However, the thermal conductivity of PP materials is low, and the time required for heat conduction of PP materials during picosecond pulse processing is longer than the pulse width, so it is difficult to correct the temperature through comprehensive laser power. Therefore, in the process of correcting the temperature, we do not adjust the output power of the laser, but adjust the preheating temperature of the feeder 1 to fine-tune the temperature of the printing area.

After the feeder 1 gives the preheating completion instruction, the transmission belt outputs the PP strip material at a rate of 0.15m/s, and the temperature of the PP material after the output is tested by the first infrared thermometer 41, and the temperature displayed by the first temperature collection 31 It is 246°C, and the calibrator allows it to proceed to the next step. After cutting with a 10W picosecond laser, it can be cut, but the surface is cut unevenly. After analysis, it is the temperature, and the temperature displayed by the second temperature acquisition 32 is 242°C. Because the best temperature matching was not achieved, the 3D printing job did not work well, and the system was manually stopped. We increased the preheating temperature to 256°C without changing the laser output power. Then perform the 3D printing operation again, and the temperature displayed by the second temperature collection 32 is 250°C. The effect of 3D printing is better, and the cutting surface has no depression, and the section after cutting is flat.

The specific embodiments described above have further described the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above descriptions are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention. In addition, the above-mentioned definitions of each element and method are not limited to the various specific structures, shapes or methods mentioned in the embodiments, and those skilled in the art can easily modify or replace them, for example: simple application of the present invention Into the 3D printing of metal powder materials.

Claims (12)

1. an application picosecond laser accurate temperature controlling 3D prints macromolecular material system, it is characterized in that, this system comprises: laser system (2), feed appliance (1), control system (3), the first infrared radiation thermometer (41) and the second infrared radiation thermometer (42); Each part connects as follows:

The first temperature acquisition (31) in first infrared radiation thermometer (41) connection control system (3), exports the preheat temperature of material for monitoring feed appliance (1);

The second temperature acquisition (32) in second infrared radiation thermometer (42) connection control system (3), for monitoring the real time temperature in picosecond laser 3D print job district;

Feeding controller (34) in feed appliance (1) connection control system (3), for carrying out preheating and conveying to material to be processed;

Laser controller (33) in laser system (2) connection control system (3), it comprises picosecond laser (21) and galvanometer (22), the effect of picosecond laser (21) is that the laser that the instruction exported according to laser controller (33) exports corresponding index implements 3D print job, the effect of galvanometer (22) is the laser beam position that the printing exported according to laser controller (33) requires instruction to change picosecond laser (21) to export, to implement quick 3D print job;

Control system (3) is the core of implementing picosecond laser accurate temperature controlling 3D printing, comprises the first temperature acquisition (31), the second temperature acquisition (32), laser controller (33), feeding controller (34), calibrator (35) and feedback and the device that reports an error (36);

Native system utilizes picosecond laser high-peak power, the advantage of high repetition frequency prints accurately to macromolecular material, and monitoring feedback is carried out to the feed appliance output preheat temperature of macromolecular material and the real time temperature in picosecond laser 3D print job district simultaneously, carry out the operating temperature that dual regulation optimizes 3D printing, thus realize the accurate control of print job temperature.

2. system according to claim 1, is characterized in that, with picosecond laser 3D print job, compensate the temperature difference with 3D print job real time temperature by calibration, feedback, laser power control, this temperature difference can accurately control within ± 0.5 DEG C.

3. system according to claim 1 and 2, it is characterized in that, described picosecond laser can be optical fiber laser or solid state laser, it exports mean power is continuously adjustabe between 1 ~ 100W, the minimum light spot diameter that output beam focuses on is less than 400 μm, and repetition rate is between 1 ~ 800MHz, and pulse width is between 1 ~ 500ps, wavelength, between 266 ~ 2000nm, is regulated its power by the laser controller (33) in control system (3); Described galvanometer (22) is high-speed vibrating mirror, and running speed can reach 1m/s, is also controlled it by the laser controller (33) in control system (3).

4. the system according to any one of claim 1 or 2, is characterized in that, described the first infrared radiation thermometer (41) and the error of the second infrared radiation thermometer (42) are ± 1 DEG C.

5. system according to claim 3, is characterized in that, described the first infrared radiation thermometer (41) and the error of the second infrared radiation thermometer (42) are ± 1 DEG C.

6. the system according to any one of claim 1,2,5, it is characterized in that, described the first temperature acquisition (31) is the temperature data of collection first infrared radiation thermometer (41), and sends it in calibrator (35); Second temperature acquisition (32) is the temperature data of collection second infrared radiation thermometer (42), and send it to calibrator (35) and feedback and the device that reports an error (36) in; Laser controller (33) connects laser system (2), it is to picosecond laser (21) and galvanometer (22) synchronism output instruction, to the instruction of picosecond laser (21) power output, print the instruction of shape and running speed to galvanometer (22); Feeding controller (34) connects feed appliance (1), and to wherein convey materials preheat temperature and output speed provide instruction; Calibrator (35) is connected with feeding controller (34) with the first temperature acquisition (31), and by the real-time preheat temperature Data Comparison that record of feeding controller (34) to the preheat temperature of material and the first infrared radiation thermometer (41), if temperature difference is more than 10 DEG C, feedback and the device that reports an error (36) will be sent instructions to; Feedback and the device that reports an error (36) are connected with calibrator (35), its storage inside has the optimal printing temperature data value of various material, and the temperature data in real time and in calibrator (35) contrasts, once the temperature difference is greater than 10 DEG C, will provide alarm.

7. system according to claim 3, is characterized in that, described the first temperature acquisition (31) is the temperature data of collection first infrared radiation thermometer (41), and sends it in calibrator (35); Second temperature acquisition (32) is the temperature data of collection second infrared radiation thermometer (42), and send it to calibrator (35) and feedback and the device that reports an error (36) in; Laser controller (33) connects laser system (2), it is to picosecond laser (21) and galvanometer (22) synchronism output instruction, to the instruction of picosecond laser (21) power output, print the instruction of shape and running speed to galvanometer (22); Feeding controller (34) connects feed appliance (1), and to wherein convey materials preheat temperature and output speed provide instruction; Calibrator (35) is connected with feeding controller (34) with the first temperature acquisition (31), and by the real-time preheat temperature Data Comparison that record of feeding controller (34) to the preheat temperature of material and the first infrared radiation thermometer (41), if temperature difference is more than 10 DEG C, feedback and the device that reports an error (36) will be sent instructions to; Feedback and the device that reports an error (36) are connected with calibrator (35), its storage inside has the optimal printing temperature data value of various material, and the temperature data in real time and in calibrator (35) contrasts, once the temperature difference is greater than 10 DEG C, will provide alarm.

8. system according to claim 4, is characterized in that, described the first temperature acquisition (31) is the temperature data of collection first infrared radiation thermometer (41), and sends it in calibrator (35); Second temperature acquisition (32) is the temperature data of collection second infrared radiation thermometer (42), and send it to calibrator (35) and feedback and the device that reports an error (36) in; Laser controller (33) connects laser system (2), it is to picosecond laser (21) and galvanometer (22) synchronism output instruction, to the instruction of picosecond laser (21) power output, print the instruction of shape and running speed to galvanometer (22); Feeding controller (34) connects feed appliance (1), and to wherein convey materials preheat temperature and output speed provide instruction; Calibrator (35) is connected with feeding controller (34) with the first temperature acquisition (31), and by the real-time preheat temperature Data Comparison that record of feeding controller (34) to the preheat temperature of material and the first infrared radiation thermometer (41), if temperature difference is more than 10 DEG C, feedback and the device that reports an error (36) will be sent instructions to; Feedback and the device that reports an error (36) are connected with calibrator (35), its storage inside has the optimal printing temperature data value of various material, and the temperature data in real time and in calibrator (35) contrasts, once the temperature difference is greater than 10 DEG C, will provide alarm.

9. the system according to any one of claim 1,2,5,7,8, it is characterized in that, described feed appliance (1) can carry out even preheating and conveying to wherein material, the temperature of its preheating can control at 100 ~ 500 DEG C, temperature-controlled precision is ± 5 DEG C, and transfer rate can control at 0 ~ 2m/s.

10. system according to claim 3, it is characterized in that, described feed appliance (1) can carry out even preheating and conveying to wherein material, and the temperature of its preheating can control at 100 ~ 500 DEG C, temperature-controlled precision is ± 5 DEG C, and transfer rate can control at 0 ~ 2m/s.

11. systems according to claim 4, it is characterized in that, described feed appliance (1) can carry out even preheating and conveying to wherein material, and the temperature of its preheating can control at 100 ~ 500 DEG C, temperature-controlled precision is ± 5 DEG C, and transfer rate can control at 0 ~ 2m/s.

12. systems according to claim 6, it is characterized in that, described feed appliance (1) can carry out even preheating and conveying to wherein material, and the temperature of its preheating can control at 100 ~ 500 DEG C, temperature-controlled precision is ± 5 DEG C, and transfer rate can control at 0 ~ 2m/s.