Novel melting device for laser powder bed based on induction heating preheating
The laser powder bed melting device, which uses induction heating preheating, employs induction heating coils and infrared thermal sensors for temperature control, thus solving the problems of temperature gradient and equipment stability caused by heating wire heating and achieving high-precision temperature control and equipment stability.
Patent Information
- Application Number
- CN202520562602.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-27
- Publication Date
- 2026-02-13
- Estimated Expiration
- 2035-03-27
AI Technical Summary
In existing laser powder bed melting devices, the preheating temperature gradient caused by heating wire leads to a decrease in equipment stability and affects motion accuracy.
The laser powder bed melting device, which uses induction heating preheating, employs induction heating coils and infrared thermal sensors to measure and control temperature through heat conduction, avoiding the Z-axis gradient problem of heating with electric heating wires. Furthermore, the cylinder and substrate fixing plane are constructed from high-temperature resistant materials, improving the stability of the equipment.
It achieves high-precision temperature control, avoids temperature gradient errors and equipment expansion caused by heating wire, and improves the motion accuracy and lifespan of the device.
Smart Images
Figure CN223902930U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to additive manufacturing technical field, concretely relates to a kind of new melting device for laser powder bed based on induction heating preheating. BACKGROUND
[0002] Laser powder bed fusion (LPBF) is an additive manufacturing technology that uses a laser beam to melt and solidify metal powder layer by layer at extremely high speeds to form the desired parts. It has a wide range of applications and integrates design and manufacturing. It has obvious advantages in the fine manufacturing of complex structures and has been widely used in the manufacturing process of complex components of various equipment. In the LPBF process, preheating is a critical step. It can reduce thermal gradients and internal stresses and improve the processability of materials. The preheating method of existing LPBF equipment almost all uses electric heating wire to heat the forming substrate to indirectly preheat the powder bed. Since electric heating wire heating is a contact heating method, the top of the electric heating wire heating lifting device is heated and then conducted to the forming substrate, which then heats the powder to be formed.
[0003] This contact-type indirect heating has two problems. First, the preheating temperature gradient problem. As the build height increases, the apparent preheating temperature on the surface may deviate significantly from the nominal preheating temperature in the forming substrate.
[0004] Second, the device stability decreases. The heating wire causes the movement mechanism to expand, affecting the movement precision.
[0005] Therefore, a new melting device for laser powder bed based on induction heating preheating is needed to solve the above problems. UTILITY MODEL CONTENTS
[0006] The utility model aims to provide a new melting device for laser powder bed based on induction heating preheating to solve the problems raised in the background technology.
[0007] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a new melting device for laser powder bed based on induction heating preheating, comprising a forming chamber, a forming part, metal powder, an induction heating coil, a forming substrate, a Z-axis lifting device, a cylinder, a thermocouple, an infrared thermal sensor, and a sensor field of view, characterized in that: the Z-axis lifting device comprises a stepper motor, a motor transmission member, a piston, a steel insert, a forming substrate fixing plane, and a piston sealing washer, the stepper motor is connected to the bottom of the forming chamber, the output shaft of the stepper motor is connected to the motor transmission member, the motor transmission member is connected to the piston, the piston has a steel insert connected inside, the steel insert is connected to the forming substrate fixing plane, the piston sealing washer is connected outside the piston, the piston sealing washer is lapped inside the cylinder, the piston is slidingly connected inside the cylinder, and the induction coil is connected inside the cylinder.
[0008] The upper surface of the forming substrate fixing plane is connected with the forming substrate, the metal powder is arranged on the forming substrate, the forming part is arranged in the metal powder, and the top of the forming chamber is vertically connected with the laser emitter.
[0009] As a preferred scheme, the laser emitter is arranged directly above the forming part, and the infrared thermal sensor is arranged on one side of the laser emitter.
[0010] As a preferred scheme, the thermocouples are arranged between the steel insert and the forming substrate fixing plane, and the number of the thermocouples is several, so that the temperature distribution can be comprehensively monitored.
[0011] As a preferred scheme, the infrared thermal sensor is arranged at the top of the forming chamber, and the measurement field range of the infrared thermal sensor covers the entire forming area.
[0012] As a preferred scheme, the material of the cylinder is quartz material, and the maximum temperature bearing capacity of the cylinder is greater than or equal to 1250 DEG C.
[0013] As a preferred scheme, the material of the forming substrate fixing plane is high-temperature-resistant ceramic or ceramic composite material, and the maximum temperature bearing capacity of the forming substrate fixing plane is 1100 DEG C. to 2700 DEG C.
[0014] As a preferred scheme, the material of the induction heating coil is pure copper material, and water is circulated in the induction heating coil.
[0015] Compared with the prior art, the beneficial effects of the utility model are:
[0016] In the utility model, temperature measurement is performed through heat conduction, and since there is no Z-direction gradient problem in induction heating, the measurement error that the temperature of the thermocouple measurement point heated by the electric heating wire is higher than the actual temperature of the forming substrate and the part can be avoided.
[0017] In the utility model, the cylinder and the forming substrate fixing plane are arranged, and in the use process, since the material of the cylinder is quartz material, the maximum temperature bearing capacity of the cylinder is greater than or equal to 1250 DEG C., the material of the forming substrate fixing plane is high-temperature-resistant ceramic or ceramic composite material, and the maximum temperature bearing capacity of the forming substrate fixing plane is 1100 DEG C. to 2700 DEG C., so that the cylinder and the forming substrate fixing plane are not easy to expand in the heating process, thereby avoiding the problem of equipment motion precision reduction, and the device can be accurately moved. BRIEF DESCRIPTION OF DRAWINGS
[0018] Figure 1 It is a structure schematic view of the utility model from the front view;
[0019] Figure 2 It is the structure schematic diagram of the front view section of the Z-axis lifting device of the utility model
[0020] Figure 3 It is the structure schematic diagram of the front view section of the steel insert of the utility model
[0021] Figure 4 It is the structure schematic diagram of the laser transmitter of the utility model.
[0022] In the figure: 1, forming chamber; 2, laser transmitter; 3, forming part; 4, metal powder; 5, induction heating coil; 6, forming base plate; 7, Z-axis lifting device; 710, stepping motor; 711, motor transmission part; 712, piston; 713, steel insert; 714, forming base plate fixed plane; 715, piston sealing washer; 8, cylinder body; 9, thermocouple; 10, infrared thermal sensor; 11, sensor field of view. DETAILED DESCRIPTION
[0023] The utility model will be further described below in combination with examples.
[0024] The following examples are used to illustrate the utility model, but cannot be used to limit the protection scope of the utility model. The conditions in the examples can be further adjusted according to specific conditions, and simple improvement of the method of the utility model under the concept premise of the utility model all belong to the range required to be protected by the utility model.
[0025] Please refer to Figures 1-4 The utility model provides a kind of new melting device for laser powder bed based on induction heating preheating, including forming chamber 1, forming part 3, metal powder 4, induction heating coil 5, forming base plate 6, Z-axis lifting device 7, cylinder body 8, thermocouple 9, infrared thermal sensor 10 and sensor field of view 11;
[0026] Z-axis lifting device 7 includes stepping motor 710, motor transmission part 711, piston 712, steel insert 713, forming base plate fixed plane 714 and piston sealing washer 715, stepping motor 710 is connected at the bottom of forming chamber 1, the output shaft of stepping motor 710 is connected with motor transmission part 711, motor transmission part 711 is connected with piston 712, piston 712 is connected with steel insert 713 in, steel insert 713 is connected with forming base plate fixed plane 714, piston sealing washer 715 is connected outside piston 712, piston 712 sealing ring is overlapped in cylinder body 8, piston 712 is slidingly connected in cylinder body 8, induction coil is connected in cylinder body 8;
[0027] The upper surface of forming base plate fixed plane 714 is connected with forming base plate 6, metal powder 4 is arranged on forming base plate 6, forming part 3 is arranged in metal powder 4, and the top of forming chamber 1 is vertically connected with laser transmitter 2.
[0028] As Figure 1 shown, the utility model provides a kind of laser powder bed melting method based on induction heating preheating, laser emitter 2 is arranged in the top of forming part 3, infrared thermal sensor 10 is arranged in the side of laser emitter 2.
[0029] As Figure 3 shown, the utility model provides a kind of laser powder bed melting method based on induction heating preheating, thermocouple 9 is arranged between steel insert 713 and forming substrate fixed plane 714, the quantity of thermocouple 9 is provided with several, several thermocouples 9 can comprehensively monitor temperature distribution;Mainly through heat conduction to measure temperature, since induction heating does not exist Z gradient problem, so can avoid the measurement error that electric heating wire heating thermocouple 9 temperature point temperature is higher than actual forming substrate 6 and part temperature;
[0030] Infrared thermal sensor 10 is arranged in the top of forming chamber 1, and the measurement field range of infrared thermal sensor 10 covers entire forming area;
[0031] In printing process, infrared thermal sensor 10 always monitors forming plane, especially the temperature of part forming cross section area, and then feedback to control system to judge and control.
[0032] As Figure 1 and Figure 2 shown, the utility model provides a kind of laser powder bed melting method based on induction heating preheating, the material of cylinder body 8 is quartz material, and the maximum temperature bearing capacity of cylinder body 8 is ≥1250 ℃;
[0033] The material of forming substrate fixed plane 714 is high-temperature-resistant ceramic or ceramic composite material, and the maximum temperature bearing of forming substrate fixed plane 714 is 1100 ℃ to 2700 ℃;
[0034] The material of induction heating coil 5 is pure copper material, and water is passed in the inside of induction heating coil 5, temperature is close to normal temperature, on the one hand, compared with the service life of electric heating wire, on the other hand, it does not affect other structures of printer.
[0035] The working principle and use process of the utility model are as follows: when the device is used, the laser beam generated by working laser emitter 2 is irradiated on forming part 3, induction heating coil 5 is arranged in the wall surface cylinder body 8 of Z-axis lifting device 7 in forming chamber 1, so that forming part, already covered metal powder 4, forming substrate 6 and the piston 712 part of Z-axis lifting device 7 are all placed in induction heating field;At this time, induction heat field can effectively heat entire forming substrate 6 and already formed part 3 in printing, so preheating temperature gradient problem generated when electric heating wire heats is not caused;In addition, induction field also has heating effect on metal powder 4 in printing process.
[0036] While the embodiments of the present application have been illustrated and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the spirit and scope of the application, which is defined by the appended claims and their equivalents.
Claims
1. A new type of melting device for laser powder bed based on induction heating preheating, comprising a forming chamber (1), a formed part (3), metal powder (4), an induction heating coil (5), a forming base plate (6), a Z-axis lifting device (7), a cylinder (8), a thermocouple (9), an infrared thermal sensor (10) and a sensor field of view (11), characterized in that: The Z-axis lifting device (7) comprises a stepper motor (710), a motor transmission (711), a piston (712), a steel insert (713), a shaped substrate fixing plane (714) and a piston sealing washer (715), the stepper motor (710) is connected at the bottom of the forming chamber (1), the output shaft of the stepper motor (710) is connected with the motor transmission (711), the motor transmission (711) is connected with the piston (712), the steel insert (713) is connected in the piston (712), the steel insert (713) is connected with the shaped substrate fixing plane (714), the piston sealing washer (715) is connected outside the piston (712), the piston (712) sealing ring is overlapped in the cylinder (8), the piston (712) is slidingly connected in the cylinder (8), and the induction heating coil is connected in the cylinder (8); The upper surface of the shaped substrate fixing plane (714) is connected with the shaped substrate (6), the metal powder (4) is arranged on the shaped substrate (6), the shaped part (3) is arranged in the metal powder (4), and the top of the forming chamber (1) is vertically connected with the laser emitter (2).
2. A novel fusing device for laser powder bed based on induction heating preheating according to claim 1, characterized in that: The laser emitter (2) is arranged directly above the shaped part (3), and the infrared thermal sensor (10) is arranged on one side of the laser emitter (2).
3. A novel induction heating preheating based melting device for laser powder bed as claimed in claim 1, wherein: The thermocouple (9) is arranged between the steel insert (713) and the shaped substrate fixing plane (714), and a plurality of thermocouples (9) are arranged.
4. A novel fusing device for laser powder bed based on induction heating preheating as claimed in claim 1, wherein: The infrared thermal sensor (10) is arranged on the top of the forming chamber (1), and the infrared thermal sensor (10) measures the field of view range covering the entire forming area.
5. A novel induction heating preheating based melting device for laser powder bed as claimed in claim 1, wherein: The material of the cylinder (8) is quartz material, and the maximum temperature bearing capacity of the cylinder (8) is greater than or equal to 1250 DEG C.
6. A novel fusing device for laser powder bed based on induction heating preheating as claimed in claim 1, wherein: The material of the shaped substrate fixing plane (714) is high-temperature-resistant ceramic or ceramic composite material, and the maximum temperature bearing capacity of the shaped substrate fixing plane (714) is 1100 DEG C. to 2700 DEG C.
7. A novel induction heating preheating based melting device for laser powder bed as claimed in claim 1, wherein: The material of the induction heating coil is pure copper material, and water is passed through the inside of the induction heating coil.