CN113211793A - Anti-warping device and anti-warping method - Google Patents

Abstract

The application discloses an anti-warping device and anti-warping method, the device includes heating element, shading component, temperature measurement component, heating element with shading component connects, heating element with shading component is located moulding platform one side at least partially, the device leaves the space contactless with the printing object on the moulding platform, heating element is optical heating component, including at least a set of light source and light source controller, the light source with the light source controller is connected, the light source controller is used for controlling the intensity of light source, shading component includes photochopper and regulating unit, the regulating unit adjusts the position that the photochopper shines on the printing object according to temperature measurement component feedback position signal, the light source controller adjusts the light source intensity according to temperature measurement component feedback temperature signal to radiate to the printing object surface makes its temperature rise, to improve the uniformity of the surface temperature of the printed object.

Description

Anti-warping device and anti-warping method

Technical Field

The application belongs to the field of additive manufacturing, and particularly relates to a warping prevention device and a warping prevention method.

Background

In the 3D printing process, the printing object can form a printing object middle area temperature lower than a top area and a bottom area due to the heating of a heating spray head (top area) and a forming table (bottom area) in the vertical layering direction, the temperature distribution is uneven in the middle area due to reasons such as material heat dissipation, the temperature of the end part is lower than that of the end part, the warping of the printing object is caused due to different shrinkage performances of the uneven temperature material, and then the phenomena of low printing precision, cracking and the like are serious.

In the prior art, the device for preventing warping adjusts the temperature difference of the printed object by changing the temperature of the spray head (adding a fan and the like) and adjusting the temperature of the forming table, but the effect is not ideal.

The adjustment of the lower temperature of the middle area is necessary and urgent, and the method has important significance for improving the printing quality and precision.

Disclosure of Invention

The embodiment of the application aims to provide a warping prevention device and a warping prevention method, and the problem that printing quality and printing precision cannot be accurately adjusted in the prior art can be solved.

In order to solve the technical problem, the present application is implemented as follows:

in a first aspect, an embodiment of the present application provides an anti-warping device, configured to improve uniformity of a surface temperature of an object, and characterized in that the device includes a heating component, a light shielding component, and a temperature measuring component, where the heating component is connected to the light shielding component, the heating component and the light shielding component are at least partially located on one side of a forming table, and the device and a printed object on the forming table leave a space without contacting;

the heating assembly is a light heating assembly and comprises at least one group of light source and a light source controller, the light source is connected with the light source controller, and the light source controller is used for controlling the intensity of the light source;

the light shading assembly comprises a light shading device and an adjusting unit, the adjusting unit adjusts the position of the light shading device, which is irradiated on the printed object, according to the temperature measuring assembly feedback position signal, and the light source controller adjusts the intensity of the light source according to the temperature measuring assembly feedback temperature signal and irradiates the surface of the printed object, so that the surface temperature of the printed object is increased, and the uniformity of the surface temperature of the printed object is improved.

In a second aspect, an embodiment of the present application provides a warpage prevention method, where the warpage prevention method includes:

setting an initial area, measuring the surface temperature of a printed object in the area by a temperature measuring component, and recording;

adjusting the shading component to limit the light irradiation range in the area;

adjusting the heating assembly to enable the surface temperature of the printed object to reach a preset value or a larger value;

repeating the above process, measuring the temperature value of the adjacent area and adjusting the temperature value of the area;

and raising the lower temperature area of all the surfaces of the printed object to make the surface temperature of the printed object consistent.

In the embodiment of the application, the heating component is arranged to be beneficial to controlling the intensity of the light source and improving the surface temperature homogenization of the printed object, the shading component is arranged to be beneficial to projecting the light source to the designated area without influencing the non-heating area, and the temperature measuring component is arranged to be beneficial to identifying the temperature and the position signal of the designated area. Specifically, the temperature unevenness of the designated surface can be adjusted by arranging at least one group of light sources, and the temperature of the printed object in one direction can be at least increased by arranging at least one group of anti-warping devices, and all the surfaces of the printed object in the horizontal direction can also be increased. The embodiment of the application accurately improves the temperature uniformity of the surface of the printed object, has the advantages of preventing the warping of any position in the whole printing process, avoiding the cracking and twisting of the printed object, and improving the precision and quality of the printed object accurately.

Drawings

FIG. 1 is a schematic structural diagram of an anti-warping device according to an embodiment of the present disclosure;

fig. 2 is a schematic flow chart of a method for preventing warping of a carbon material in an embodiment of the present application.

Description of reference numerals:

10. a warpage preventing device; 20. a heating assembly; 21. a light source; 22. a light source controller; 30. a shading component; 31. a light chopper; 32. an adjustment unit; 321. a drive unit; 322. an execution unit; 40. a forming table; 50. printing an object; 60. a temperature measuring component; 61. a temperature measuring instrument; 62. a position measuring instrument; 70. a steering assembly; 80. 3D printer

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that embodiments of the application may be practiced in sequences other than those illustrated or described herein, and that the terms "first," "second," and the like are generally used herein in a generic sense and do not limit the number of terms, e.g., the first term can be one or more than one. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.

The warping prevention device and the warping prevention method provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings through specific embodiments and application scenarios thereof.

Referring to fig. 1, an embodiment of the present application provides a warpage preventing device 10, configured to improve uniformity of a surface temperature of an object, and characterized in that the warpage preventing device includes a heating assembly 20, a light shielding assembly 30, and a temperature measuring assembly 60, where the heating assembly 20 is connected to the light shielding assembly 30, the heating assembly 20 and the light shielding assembly 30 are at least partially located at one side of a forming table 40, and the device 10 and a printed object 50 on the forming table 40 are left with a space and are not in contact with each other;

the heating assembly 20 is a light heating assembly and comprises at least one group of light source 21 and a light source controller 22, the light source 21 is connected with the light source controller 22, and the light source controller 22 is used for controlling the intensity of the light source 21;

the shading assembly 30 comprises a shading device 31 and an adjusting unit 32, the adjusting unit 32 adjusts the position of the shading device 31 irradiated on the printed object 50 according to the position signal fed back by the temperature measuring assembly 60, and the light source controller 22 adjusts the intensity of the light source 21 according to the temperature signal fed back by the temperature measuring assembly 60 and irradiates the surface of the printed object 50, so that the surface temperature of the printed object 50 is increased, and the uniformity of the surface temperature of the printed object 50 is improved.

In the embodiment of the present application, the arrangement of the heating assembly 20 is beneficial to controlling the intensity of the light source 21 and improving the surface temperature uniformity of the printed object 50, the arrangement of the light shielding assembly 30 is beneficial to projecting the light source 21 to the designated area without affecting the non-heating area, and the arrangement of the temperature measuring assembly 60 is beneficial to identifying the temperature and position signals of the designated area. Specifically, the temperature unevenness of the designated surface can be adjusted by providing at least one set of light source 21, and the temperature of one side of the printing object can be increased by providing at least one set of warp preventing device 10, and all sides of the printing object in the horizontal direction can also be increased. The embodiment of the application accurately improves the temperature uniformity of the surface of the printed object, has the advantages of preventing the warping of any position in the whole printing process, avoiding the cracking and twisting of the printed object, and improving the precision and quality of the printed object accurately.

It should be noted that the forming table 40 is located on the 3D printer 80, the object 50 is printed and formed on the forming table 40, and the anti-warping device 10 may be connected to the forming table 40 and move along with the forming table 40 according to different forming modes of the 3D printer, or may be fixed on the printer and does not move along with the forming table 40.

It should be noted that, at least one group of light sources 21 may be arranged, and when there are multiple groups of light sources 21, the light sources may be arranged in an array, and the on/off, intensity and time of the light sources may be controlled according to the measured temperature and position.

It should be noted that the shutter 31 may be a plate-shaped structure, the shutter 31 is connected to the light source 21, and the angle of the shutter 31 is adjusted by the adjusting unit 32 so that the light irradiates the designated area.

It should be noted that, the temperature value of the lower temperature region can be increased without the temperature measuring component 60, so as to reduce the temperature difference, but the temperature control cannot be realized accurately.

It should be noted that, in the device, all the temperature and position signals can be memorized and fed back, and can be accessed into the control system of the 3D printer for unified control and feedback, or can be directly controlled and adjusted by the components of the device.

In the process of starting printing, the surface of the printed object 50 gradually forms a temperature unevenness phenomenon, and the temperature unevenness phenomenon is more obvious along with the increase of the layering thickness of the printed object 50;

optionally, the light source 21 is a current-driven heating and light-emitting device, such as an infrared heating bulb or a lamp bead, or a laser.

It should be noted that the light source 21 generates heat light after being energized, and the light is radiated to the surface of the object 50 to generate heat, thereby increasing the temperature.

Optionally, the temperature measuring component 60 comprises a temperature measuring instrument 61, and the temperature measuring instrument 61 measures and feeds back the temperature generated by the light source 21 radiating on the printing object 50.

It should be noted that, after the temperature measuring instrument 61 detects the temperature of the designated area, the signal is fed back to the heating assembly 20 and the light shielding assembly 20 to adjust the temperature of the designated area, when the preset temperature value is reached, the next area is entered for temperature detection and adjustment, and the process is repeated until all the surface temperatures of the printing object 50 are uniform.

It should be noted that in the process, after the temperature measuring instrument 61 detects all temperature signals in the designated area, the temperature measuring instrument feeds back the signals to the heating assembly 20 and the light shielding assembly 20 to adjust the temperature change in the designated area, when the preset temperature value is reached, the printing process continues, the next area is entered to detect the temperature and adjust the temperature, and the process is repeated until all the surface temperatures of the printed object 50 are uniform.

Optionally, the light source controller 22 controls the light source 21 of the relevant region to be switched on or off according to the feedback signal of the temperature measuring component 60, so as to realize the change of the illumination intensity of the region.

It should be noted that the light source controller 22 can control at least one group of light sources 21 simultaneously, so as to generate a temperature change in a certain direction.

It should be noted that the light source controller 22 may implement turning off and turning on of any group of light sources 21 at a certain position by switch control, and may also implement the intensity of any group of light sources 21 at a certain position.

Optionally, the thermometric assembly 60 further comprises a position measuring instrument 62, and the position measuring instrument 62 measures and feeds back position information of the temperature signal of the measurement area.

It should be noted that the position measuring instrument 62 is mainly used for measuring the position of the temperature signal.

Optionally, the adjusting unit 32 includes a driving unit 321 and an executing unit 322, and the driving unit 321 and the executing unit 322 are connected;

the driving unit 321 is a power device, such as a motor, one end of the executing unit 322 is connected to the shutter 31, and the executing unit 322 adjusts the shutter 31 under the driving of the driving unit 321 to change the position of the printed object 50.

It should be noted that the adjusting unit 32 is mainly used for accurately radiating light to a desired range.

Optionally, the apparatus 10 is at least one set for illuminating at least one face of the printed object 50.

The devices 10 may be four sets, which are respectively distributed in four directions of the forming table 40, or may be one set, which are distributed on a certain plane, and the devices 10 may be circumferential, parallel to the forming table 40, and distributed around the printing object 50.

Optionally, the device 10 further comprises a steering assembly 70, and the steering assembly 70 controls the position or the angle of the temperature measuring assembly 60 to change so as to measure the temperature signals at different positions.

It should be noted that the steering assembly 70 is used to control the movement of the temperature measuring assembly 60, where the movement may be a change in the position or a change in the angle of the temperature measuring assembly 60, and the steering assembly 70 includes a driving unit and a steering unit, where the driving unit may be a motor, and drives the steering unit to move or rotate, so as to detect the temperature of the temperature measuring assembly 60 at different positions on the printed object 50.

Referring to fig. 2, an embodiment of the present application provides a warpage prevention method, which is characterized by including the steps of:

setting an initial area, measuring the surface temperature of the printed object 50 in the area by the temperature measuring component 60, and recording;

step S101: setting an initial region, wherein the initial region is positioned on a bottom layer which does not comprise a contact with the forming table 40 and a top layer which does not comprise a contact with the printing spray head, measuring the temperature value of the region can be averaged, or can be refined to each position, and the measured signal value can be stored in a 3D printing system medium or directly stored in the light source controller 22;

adjusting the shading component 30 to limit the light irradiation range in the area;

step S102: the area is an area with a measured temperature value, the area is set according to a 3D printing program, the driving unit is controlled to move 321, and then the execution unit 322 is driven, and the execution unit 322 drives the shutter 31 to zoom the area range;

adjusting the heating assembly 20 to make the surface temperature of the printed object 50 reach a preset value or a larger value;

step S103: according to the current temperature value of the area, the intensity of the light source 21 is changed by adjusting the light source controller 22, if the area uses the average value, the difference between the preset value and the average value is the temperature value to be increased, if the area is accurately adjusted, the light intensity irradiated at the position of the area is accurately controlled according to the temperature distribution of the area, and the increased temperature value is the preset value and the temperature value at the position;

wherein the larger value of the surface temperature is the measured higher temperature value of the bottom layer or the top layer;

repeating the above process, measuring the temperature value of the adjacent area and adjusting the temperature value of the area;

step S104: when the temperature of the area reaches a preset value, the irradiation range of the device 10 enters the next area, wherein if the irradiation range is small and is not enough to cover the horizontal length of the printing object 50, the next area is a horizontal adjacent area, and the temperature of the printing object 50 is preferably ensured to be gradually adjusted along the vertical direction of the printer after the horizontal surface temperature reaches the preset value; if the irradiation range is large enough to cover the horizontal length of the print object 50, the temperature is adjusted only in the vertical direction of the printer, and the adjacent area is an area adjacent to the vertical direction.

Until the area of lower temperature on all surfaces of the printed object 50 is raised, the surface temperature of the printed object 50 is made to be consistent.

Step S105: the temperature rise process is repeated, so that the lower temperature of the surface of the printed object 50 gradually reaches a preset temperature value, and the surface temperature of the printed object 50 tends to be consistent.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. Further, it should be noted that the scope of the methods and apparatus of the embodiments of the present application is not limited to performing the functions in the order illustrated or discussed, but may include performing the functions in a substantially simultaneous manner or in a reverse order based on the functions involved, e.g., the methods described may be performed in an order different than that described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.

While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (9)

1. A warping prevention device (10) is used for improving the uniformity of the surface temperature of an object and is characterized by comprising a heating assembly (20), a shading assembly (30) and a temperature measuring assembly (60), wherein the heating assembly (20) is connected with the shading assembly (30), the heating assembly (20) and the shading assembly (30) are at least partially arranged on one side of a forming table (40), and a space is reserved between the device (10) and a printed object (50) on the forming table (40) and is not in contact with the printed object;

the heating assembly (20) is a light heating assembly and comprises at least one group of light source (21) and a light source controller (22), the light source (21) is connected with the light source controller (22), and the light source controller (22) is used for controlling the intensity of the light source (21);

the shading assembly (30) comprises a shading device (31) and an adjusting unit (32), the adjusting unit (32) adjusts the position of the shading device (31) irradiated on the printed object (50) according to a position signal fed back by the temperature measuring assembly (60), and the light source controller (22) adjusts the intensity of the light source (21) according to a temperature signal fed back by the temperature measuring assembly (60) and radiates to the surface of the printed object (50), so that the surface temperature of the printed object (50) is increased, and the uniformity of the surface temperature of the printed object (50) is improved.

2. The warpage preventing device (10) according to claim 1, wherein the light source (21) is a current driven heat emitting light emitting device, such as an infrared heating bulb or bead, a laser.

3. The warpage preventing device (10) according to claim 1, wherein the temperature measuring component (60) comprises a temperature measuring instrument (61), and the temperature measuring instrument (61) measures and feeds back the temperature generated by the light source (21) radiating onto the printed object (50).

4. The warping prevention device (10) according to claim 1, wherein the light source controller (22) controls the light source (21) of the relevant area to be turned on or off or changed in intensity according to the feedback signal of the temperature measurement component (60) to achieve the change of the illumination intensity of the area.

5. The warpage preventing device (10) according to claim 1, wherein the temperature measuring component (60) further comprises a position measuring instrument (62), and the position measuring instrument (62) measures and feeds back position information of the temperature signal of the measuring area.

6. The warpage preventing device (10) according to claim 1, wherein the adjusting unit (32) comprises a driving unit (321) and an executing unit (322), the driving unit (321) and the executing unit (322) being connected;

the driving unit (321) is a power device, such as a motor, one end of the execution unit (322) is connected with the light chopper (31), and the execution unit (322) adjusts the light chopper (31) under the driving of the driving unit (321) to change the position irradiated to the surface of the printing object (50).

7. The warpage preventing device (10) according to claim 1, wherein the device (10) is at least one set for illuminating at least one side of the printed object (50).

8. The warping prevention device (10) according to claim 1, wherein the device (10) further comprises a steering assembly (70), and the steering assembly (70) controls the position or angle of the temperature measurement assembly (60) to change to measure the temperature signals at different positions.

9. A method of preventing warpage, the method comprising the steps of:

setting an initial area, measuring the surface temperature of a printed object in the area by a temperature measuring component, and recording;

adjusting the shading component to limit the light irradiation range in the area;

adjusting the heating assembly to enable the surface temperature of the printed object to reach a preset value or a larger value;

repeating the above process, measuring the temperature value of the adjacent area and adjusting the temperature value of the area;

and raising the lower temperature area of all the surfaces of the printed object to make the surface temperature of the printed object consistent.

Images