CN109571942B - Three-dimensional object manufacturing apparatus, method thereof, and computer storage medium - Google Patents
Three-dimensional object manufacturing apparatus, method thereof, and computer storage medium Download PDFInfo
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- CN109571942B CN109571942B CN201811264706.3A CN201811264706A CN109571942B CN 109571942 B CN109571942 B CN 109571942B CN 201811264706 A CN201811264706 A CN 201811264706A CN 109571942 B CN109571942 B CN 109571942B
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 22
- 238000003860 storage Methods 0.000 title claims abstract description 11
- 239000000843 powder Substances 0.000 claims abstract description 75
- 238000000465 moulding Methods 0.000 claims abstract description 34
- 238000010438 heat treatment Methods 0.000 claims abstract description 10
- 238000005245 sintering Methods 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims abstract description 5
- 238000003892 spreading Methods 0.000 claims abstract description 5
- 239000000758 substrate Substances 0.000 claims abstract 2
- 238000004590 computer program Methods 0.000 claims description 6
- 238000005516 engineering process Methods 0.000 description 5
- 239000000654 additive Substances 0.000 description 4
- 230000000996 additive effect Effects 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000000110 selective laser sintering Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 238000010146 3D printing Methods 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
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- 238000000149 argon plasma sintering Methods 0.000 description 1
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- 238000002474 experimental method Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/10—Processes of additive manufacturing
- B29C64/141—Processes of additive manufacturing using only solid materials
- B29C64/153—Processes of additive manufacturing using only solid materials using layers of powder being selectively joined, e.g. by selective laser sintering or melting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/20—Apparatus for additive manufacturing; Details thereof or accessories therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/20—Apparatus for additive manufacturing; Details thereof or accessories therefor
- B29C64/264—Arrangements for irradiation
- B29C64/268—Arrangements for irradiation using laser beams; using electron beams [EB]
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/30—Auxiliary operations or equipment
- B29C64/386—Data acquisition or data processing for additive manufacturing
- B29C64/393—Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y50/00—Data acquisition or data processing for additive manufacturing
- B33Y50/02—Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
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Abstract
The present application relates to a three-dimensional object manufacturing apparatus, a method thereof, and a computer storage medium. The apparatus comprises a powder spreader for spreading a powder material onto a substrate or a layer that has been selectively solidified to form a powder layer, an energy source, a scanning system, a heating system, and a control system; the energy source is used for generating laser; the heating system is used for preheating the powder layer in the molding area; the control system is used for increasing the light spot of the laser under the control of the scanning system before the selective scanning sintering is carried out on the powder layer of the molding area, so that the laser with the increased light spot can carry out at least one scanning on the powder layer of a preset cylinder side area in the molding area under the control of the scanning system to improve the temperature of the cylinder side area. The invention not only improves the temperature of the edge area of the cylinder body, but also effectively enlarges the area of a molding area, improves the utilization rate of powder and has simple structure.
Description
Technical Field
The present application relates to the field of additive manufacturing technologies, and in particular, to a three-dimensional object manufacturing apparatus and method, and a computer storage medium.
Background
The additive manufacturing technology is an advanced manufacturing technology with the distinct characteristics of digital manufacturing, high flexibility and adaptability, direct CAD model driving, high speed, rich and various material types and the like, and has a very wide application range because the additive manufacturing technology is not limited by the complexity of the shape of a part and does not need any tool die. Selective Laser Sintering (SLS) and Selective Laser Melting (SLM) are the most rapidly developing additive manufacturing techniques in recent years.
The basic process of selective laser sintering molding is as follows: an infrared radiation device is arranged above a region to be formed to preheat powder in the region, so that the powder in the region reaches a uniform and stable temperature, a scanning system (namely a vibrating mirror) controls a high-energy laser beam to act on the nylon powder in the region to be formed according to layered slice information of a three-dimensional model of a formed part, most of energy is absorbed and converted into heat energy of the powder, and the powder temperature is rapidly increased to be above a melting point to be melted. After the scanning of one layer is finished, the piston in the forming cylinder can descend by one layer thickness; the powder feeding device feeds a certain amount of powder to a working table, and the powder spreading system spreads a layer of thick powder to be deposited on the formed layer. And repeating the forming process until all the slice layers of the three-dimensional model are completely scanned to form the workpiece to be printed.
In the above-mentioned forming process, although there is an infrared radiation device to heat the whole area to be formed, the heat of the powder at the edge of the cylinder wall can be quickly conducted by the metal cylinder, so that the temperature of the powder with a certain thickness near the cylinder is always lower than that of the other area to be formed in the laser sintering process, however, the sintering occurs in the area with a lower temperature, which inevitably causes the deformation and warpage of the section after forming, and the forming process cannot be continued.
In order to solve the problems, the prior art generally adopts a conduction type heater to increase the temperature of the four walls of the cylinder body so as to ensure the forming range, but the forming effect near the cylinder body is not ideal all the time due to the limitation of the structure, the uniformity of the heater and the heat dissipation of the cylinder body.
Disclosure of Invention
In view of the above, it is necessary to provide a three-dimensional object manufacturing apparatus, a method thereof, and a computer storage medium, which can increase the temperature of the edge region of the cylinder, further effectively enlarge the area of the molding region, and improve the powder utilization rate, and which have a simple structure.
To achieve the above object, the present invention provides a three-dimensional object manufacturing apparatus including a powder spreader for spreading a powder material on a base plate or a layer that has been selectively solidified to form a powder layer, an energy source, a scanning system, a heating system, and a control system; the energy source is used for generating laser; the heating system is used for preheating the powder layer in the molding area; the control system is used for increasing the light spot of the laser under the control of the scanning system before the selective scanning sintering is carried out on the powder layer of the molding area, so that the laser with the increased light spot can carry out at least one scanning on the powder layer of a preset cylinder side area in the molding area under the control of the scanning system to improve the temperature of the cylinder side area.
As a further preferable aspect of the present invention, the scanning system includes a diverging mirror, a galvanometer, and a plano mirror, and the laser generated by the energy source sequentially enters the powder layer in the molding area through the diverging mirror, the galvanometer, and the plano mirror to scan.
As a further preferable aspect of the present invention, the control system adjusts the spot size of the laser light passing through the scanning system by controlling the movement of the diverging mirror.
The invention also provides a control method of the three-dimensional object manufacturing equipment, which comprises the following steps:
after the powder layer of the molding area is paved, laser is made to be incident into the molding area in a first light spot mode through control over a scanning system, and the powder layer of a preset cylinder edge area in the molding area is scanned at least once to improve the temperature of the cylinder edge area;
when the temperature of the powder layer in the molding area reaches a set temperature value, laser is made to enter the molding area through the second light spot by controlling the scanning system, and selective laser scanning is carried out on the powder layer in the molding area;
wherein the size of the first light spot is larger than the size of the second light spot.
As a further preferable aspect of the present invention, when the energy acquired at any one of the preset cylinder side areas is less than half of the central energy of the laser spot, the powder layer of the preset cylinder side area is scanned N times, otherwise, the powder layer of the preset cylinder side area is scanned once.
As a further preferable aspect of the present invention, N is calculated by the following formula:
N＝INT(n)；
wherein, ω is the first spot size, and L is the width of the preset cylinder side area.
In a further preferred embodiment of the present invention, K is 1.
As a further preferable aspect of the present invention, the powder layer in the preset cylinder side area is scanned N times by using a Z-scan method.
The invention also provides a computer-readable storage medium, on which a computer program is stored, which computer program, when being executed by a processor, carries out the steps of the method of any of the above.
According to the three-dimensional object manufacturing equipment and the method thereof, and the computer storage medium, before the powder layer of the forming area is subjected to selective scanning sintering, the light spot of the laser is increased through the control of the scanning system, so that the laser with the increased light spot scans the powder layer of the preset cylinder edge area in the forming area at least once under the control of the scanning system to improve the temperature of the cylinder edge area, and the temperature of the cylinder edge area is improved, so that the area of the forming area is effectively enlarged, the working efficiency of the equipment is improved, the powder utilization rate is improved, the equipment structure is simple, and the cost is low.
Drawings
FIG. 1 is a schematic structural diagram of a three-dimensional object manufacturing apparatus according to an embodiment;
FIG. 2 is a schematic method flow diagram of a method of controlling a three-dimensional object fabrication facility in one embodiment;
FIG. 3 is a diagram illustrating a scan strategy for a predetermined cylinder edge region in an embodiment.
In the figure: 1. the device comprises a control system, 2, laser, 3, a divergent mirror, 4, a galvanometer, 5, a planoscope, 6, a forming area, 7 and a heating system.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In the prior art, although a person skilled in the art generally preheats a powder layer before scanning and sintering with a laser 2 to increase the temperature of the powder layer and reduce internal stress, the person skilled in the art does not find the technical problem that the cylinder edge area of a forming cylinder is low in temperature due to the fact that heat is easily dissipated at the edge of the forming cylinder, so that when a to-be-printed workpiece is located at the edge of the forming cylinder, the formed section is deformed and warped, and further the workpiece is continuously printed, and therefore a great technical problem is brought to a 3D printing technology; in the face of this technical problem, another approach adopted by those skilled in the art is to reduce the area of the forming area 6 of the forming cylinder, i.e. to print the object only in the middle of the forming area 6, but this greatly reduces the forming efficiency.
In order to solve the above technical problem, in one embodiment, as shown in fig. 1, the present invention provides a three-dimensional object manufacturing apparatus including a powder spreader for spreading a powder material on a base plate or a layer that has been selectively solidified to form a powder layer, an energy source, a scanning system, a heating system 7, and a control system 1; the energy source is used for generating laser 2; the heating system 7 is used for preheating the powder layer of the molding area 6; the control system 1 is configured to increase the light spot of the laser 2 under the control of the scanning system before selectively scanning and sintering the powder layer in the molding area 6, so that the laser 2 with the increased light spot performs at least one scan on the powder layer in a preset cylinder side area in the molding area 6 under the control of the scanning system to increase the temperature of the cylinder side area. Therefore, the invention improves the temperature of the edge area of the cylinder body, effectively enlarges the area of the forming area 6 on the premise of ensuring the forming quality of a formed part to be printed, further improves the working efficiency of equipment and the utilization rate of powder, and has simple equipment structure and low cost.
The preset cylinder edge area is an area close to the edge of the cylinder wall of the forming cylinder in the forming area 6, and the heat of the powder at the edge of the cylinder wall of the forming cylinder can be rapidly conducted through the metal cylinder body, so that the temperature of the powder with a certain thickness near the cylinder body is always lower than that of other part areas in the forming area 6 in the laser 2 sintering process. It should be noted that the specific width value of the preset cylinder side area may be obtained by a designer through multiple experimental measurements, or may be obtained through calculation and analysis, for example, the temperature of each point in the molding area 6 may be detected by a temperature detector, and by comparing and determining which areas of the cylinder wall edge belong to the preset cylinder side area one by one, the width of the preset cylinder side area may be obtained by measuring the widths of the areas. Of course, it will be appreciated that the specific width of the above-mentioned predetermined cylinder edge region may also be obtained in other ways.
Specifically, the scanning system comprises a diverging mirror 3, a galvanometer 4 and a plano mirror 5, the laser 2 generated by the energy source is sequentially incident on a powder layer of a forming area 6 through the diverging mirror 3, the galvanometer 4 and the plano mirror 5 for scanning, and the control system 1 adjusts the size of a light spot of the laser 2 passing through the scanning system by controlling the movement of the diverging mirror 3, for example, when scanning the powder layer of a preset cylinder edge area in the forming area 6, the size of the light spot of the laser 2 is increased; and when the powder layer of the molding area 6 is subjected to selective scan sintering, the spot size of the laser 2 is reduced.
As shown in fig. 2, the present invention also provides a control method of a three-dimensional object manufacturing apparatus, including the steps of:
step S1, after the powder layer of the forming area 6 is laid, the scanning system is controlled to make the laser 2 enter the forming area 6 as a first light spot, and the powder layer of the preset cylinder edge area in the forming area 6 is scanned at least once to increase the temperature of the cylinder edge area;
in step S1, the preset cylinder rim area is an area close to the edge of the cylinder wall of the forming area 6, and since heat of the powder at the edge of the cylinder wall of the forming area is rapidly conducted through the metal cylinder, the temperature of the powder with a certain thickness near the cylinder is always lower than that of the other part area in the forming area 6 during the laser 2 sintering process. It should be noted that the specific width value of the preset cylinder side area may be obtained by a designer through multiple experiments, or may be obtained through calculation and analysis, for example, the temperature of each point of the forming area 6 is detected by a temperature detector, and by comparing and judging which areas of the cylinder wall edge belong to the preset cylinder side area one by one, the width of the preset cylinder side area is obtained by measuring the width of the areas. Of course, it will be appreciated that the specific width of the above-mentioned predetermined cylinder edge region may also be obtained in other ways.
Step S2, when the temperature of the powder layer in the molding area 6 reaches the set temperature value, the scanning system is controlled to make the laser 2 enter the molding area 6 as a second spot, and the powder layer in the molding area 6 is selectively scanned by the laser 2;
wherein the size of the first light spot is larger than the size of the second light spot.
In step S2, the set temperature value can be specifically set by a designer according to design requirements, and belongs to the prior art in the field, and will not be described in detail herein.
Preferably, in order to ensure a higher preheating effect of the preset cylinder side area, when the energy acquired at any one of the preset cylinder side areas is less than one-half of the central energy of the laser 2 light spot, scanning the powder layer of the preset cylinder side area for N times, otherwise, scanning the powder layer of the preset cylinder side area for one time.
The incident laser 2 scan follows the following principle: when the size of an incident light spot is adjusted to be specific but not enough to cover the whole preset cylinder side area, namely the energy acquired by each position of the preset cylinder side area is less than half of the energy of the center of the light spot, the area is scanned for multiple times, and partial area overlapping exists between scanning lines. According to the light intensity distribution of the Gaussian beam:
I0representing the beam axis position intensity of the laser 2, I being the intensity at r from the beam axis, and ω representing the first spot size. The scanning lines are assumed to overlap at a position r away from the center of the scanning lines, so that the energy in the area is not less than one half of the central energy of the light spot and not more than one half of the central energy of the light spotEnergy at the center of the spot, 1/4I0≤I(r)≤1/2I0Introducing a factor K into the reaction kettle,
k satisfies
When the distance between two adjacent scanning lines is
Assuming that the width of the preset cylinder edge area is L, the scanning times of the incident laser 2 in the preset cylinder edge area is n, and L satisfies the following conditions:
n satisfies:
from the above analysis, it can be seen that N is calculated by the following formula:
N＝INT(n)；
wherein, ω is the first spot size, and L is the width of the preset cylinder side area.
As a preferred embodiment of the present invention, K is 1, at this time, two adjacent scanning lines overlap at 1/2 of the central energy thereof, at this time, only the narrow edge region of the preset cylinder edge region obtains a lower energy, and the energy difference in most regions is very small, so that the entire region is heated more uniformly. For example, when the width of the preset cylinder edge area is 20mm, the first light spot size ω can be adjusted to 5mm, and according to the formula, the scanning frequency is 3, so that a large temperature difference in the low-temperature area can be effectively avoided, and the optimal heating effect is achieved.
Preferably, the powder layer in the preset cylinder edge area may be scanned N times by using a Z-shaped scanning manner, as shown in fig. 3, and of course, in a specific implementation, other scanning manners may also be used to scan, and only the preset cylinder edge area is scanned completely.
The invention also provides a computer-readable storage medium, on which a computer program is stored, which computer program, when being executed by a processor, carries out the steps of the method of any of the above.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (8)
1. A three-dimensional object manufacturing apparatus comprising a powder spreader for spreading a powder material onto a substrate or a layer that has been selectively solidified to form a powder layer, an energy source, a scanning system, a heating system and a control system; the energy source is used for generating laser; the heating system is used for preheating the powder layer in the molding area; the control system is used for increasing the light spot of the laser under the control of the scanning system before selectively scanning and sintering the powder layer of the molding area, so that the laser with the increased light spot can scan the powder layer of a preset cylinder edge area in the molding area at least once under the control of the scanning system to improve the temperature of the cylinder edge area; wherein,
and when the energy acquired at any position in the preset cylinder edge area is less than half of the central energy of the laser spot, scanning the powder layer of the preset cylinder edge area for N times, or else, scanning the powder layer of the preset cylinder edge area for one time.
2. The three-dimensional object manufacturing apparatus according to claim 1, wherein the scanning system includes a diverging mirror, a vibrating mirror, and a flat mirror, and the laser light generated by the energy source is incident on the powder layer of the molding area through the diverging mirror, the vibrating mirror, and the flat mirror in order to scan.
3. The three-dimensional object fabrication apparatus of claim 2, wherein the control system adjusts the spot size of the laser light passing through the scanning system by controlling movement of a diverging mirror.
4. A control method of the three-dimensional object manufacturing apparatus according to any one of claims 1 to 3, characterized by comprising the steps of:
after the powder layer of the molding area is paved, laser is made to be incident into the molding area in a first light spot mode through control over a scanning system, and the powder layer of a preset cylinder edge area in the molding area is scanned at least once to improve the temperature of the cylinder edge area; wherein,
when the energy acquired at any position in the preset cylinder edge area is less than half of the central energy of the laser spot, scanning the powder layer of the preset cylinder edge area for N times, or else, scanning the powder layer of the preset cylinder edge area for one time;
when the temperature of the powder layer in the molding area reaches a set temperature value, laser is made to enter the molding area through the second light spot by controlling the scanning system, and selective laser scanning is carried out on the powder layer in the molding area;
wherein the size of the first light spot is larger than the size of the second light spot.
5. The control method according to claim 4, wherein the N is calculated by the following formula:
wherein, ω is the first spot size, and L is the width of the preset cylinder side area.
6. The control method according to claim 5, wherein K = 1.
7. The control method according to claim 6, wherein the powder layer of the preset cylinder edge area is scanned for N times by adopting a Z-shaped scanning mode.
8. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 4 to 7.
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| CN111673084B (en) * | 2020-06-15 | 2023-08-08 | 杭州德迪智能科技有限公司 | Temperature control method, electronic device and computer readable storage medium |
| CN111829454A (en) * | 2020-07-17 | 2020-10-27 | 湖南华曙高科技有限责任公司 | Calibration device for scanning system and calibration method thereof |
| CN114413799B (en) * | 2022-04-02 | 2022-06-28 | 季华实验室 | Chip substrate warpage detection method, system and device and electronic equipment |
| CN115475961B (en) * | 2022-09-27 | 2023-06-30 | 湖南华曙高科技股份有限公司 | Control method and system for powder bed melting laser sintering and additive manufacturing equipment |
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|---|---|---|---|---|
| CN105880591A (en) * | 2016-05-10 | 2016-08-24 | 北京隆源自动成型系统有限公司 | Selective laser forming metal powder preheating method and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105880591A (en) * | 2016-05-10 | 2016-08-24 | 北京隆源自动成型系统有限公司 | Selective laser forming metal powder preheating method and device |
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