Wind field flow guide structure of additive manufacturing equipment
By designing the wind field flow diversion structure of plasma discharge support columns and honeycomb deflectors in additive manufacturing equipment, the problem of wind field in SLM is solved, and the uniform distribution of airflow and the improvement of printing quality is achieved.
Patent Information
- Application Number
- CN202421087601.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-20
- Publication Date
- 2025-01-17
- Estimated Expiration
- 2034-05-20
AI Technical Summary
In laser selection melting technology (SLM), during laser scanning and sintering under a closed environment, smoke and molten pool splashes lead to uneven wind field, affecting printing quality and accuracy. The existing wind speed regulation system cannot effectively solve the uniformity of the wind field air outlet. Sexual problems.
Design a wind field diversion structure for additive manufacturing equipment, including plasma discharge support columns, honeycomb deflectors, fixing rods and discharge conductors, and form a uniform airflow distribution through plasma discharge support columns and honeycomb deflectors. Ensure uniformity of wind speed and reduce the interference of smoke and dust on the laser.
The smooth operation of airflow in the cavity and uniformity of wind speed are achieved, the interference of smoke and dust on the laser is reduced, the printing quality and stability are improved, and the powder blowing phenomenon and the accumulation of splash residue in the molten pool are avoided.
Smart Images
Figure CN222359283U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of additive manufacturing, and in particular relates to a wind field guide structure of additive manufacturing equipment. Background Art
[0002] Selective laser melting (SLM) is a method of metal additive manufacturing. During the processing, the laser emits laser light, which is processed by the optical system and then irradiated onto the processing plane. Under the control of the control system, the laser scans and sinters the powder bed of metal powder according to the contour curve calculated by the system's STL file, so that the metal powder is melted and formed into a final part.
[0003] Since the SLM powder laying equipment molding chamber is in a closed environment, during the laser scanning and sintering process, the metal powder irradiated by the laser is easy to produce smoke and molten pool splashes under high temperature conditions. The rising smoke will interfere with the irradiated laser, weaken the laser intensity, and affect the molding quality of the printed parts. At the same time, the splashing residue of the molten pool falls on the powder bed, causing secondary sintering of the lower layer of powder laser scanning, affecting the molding accuracy. Therefore, having a stable wind field in the laser printing area is crucial to printing accuracy.
[0004] Although a wind speed adjustment system is currently installed in the circulating air duct to stabilize the wind speed in the wind field, it only adjusts the wind speed of the wind field and lacks the design of the uniformity of the entire air outlet of the wind field. The applicant found that if the SLM powder spreading equipment cannot ensure the uniformity of the wind speed above the powder spreading molding area, the printing quality at different positions in the powder spreading molding area will be uneven. The lighter powder at the position with higher wind speed will be blown away along with the smoke and splashes, causing the powder on the powder bed to be lost, resulting in powder blowing and defects in part forming; the area with lower wind speed cannot blow away the splashed residue from the molten pool, which seriously reduces the printing quality. Therefore, it is necessary to optimize the design of the guide structure on the air outlet side. Utility Model Content
[0005] The main technical problem solved by the utility model is to provide a wind field guide structure for additive manufacturing equipment, which occupies a small space, and the airflow formed runs smoothly in the cavity with uniform wind speed, and reduces the probability of smoke and dust blocking the laser from reaching the sintering section, thereby improving the printing quality and printing stability of the workpiece to be printed.
[0006] In order to solve the above technical problems, a technical solution adopted by the utility model is: to provide a wind field guide structure of an additive manufacturing device, which is arranged on a base, and a protruding boss is arranged in the middle of the base, and the center of the boss is a powder laying and forming area with a hollow structure that penetrates longitudinally, including a plasma discharge support column, a honeycomb guide plate, a fixed rod and a discharge guide head, the plasma discharge support column includes a first plasma discharge support column and a second plasma discharge support column, the honeycomb guide plate is distributed longitudinally and fixed to the base on both sides by the first plasma discharge support column, the fixed rods are arranged in two parallel lines transversely, and the two ends are respectively fixed to the base by the second plasma discharge support column, the discharge guide head is arranged in a transversely distributed Y-shaped structure, the discharge guide head is arranged toward the honeycomb guide plate, and the two forks on the fixed side are respectively fixed on the two fixed rods.
[0007] In a preferred embodiment of the present invention, the plasma discharge support column, the honeycomb guide plate, the fixing rod and the discharge guide head are sequentially arranged in two groups and are located on both sides of the boss.
[0008] In a preferred embodiment of the present invention, a plurality of discharge guides are provided and are laterally evenly spaced and arranged between the two fixing rods.
[0009] In a preferred embodiment of the present invention, reinforcing rods are respectively provided on the upper and lower sides of the two fixing rods and are connected and fixed to the second plasma discharge supporting column.
[0010] The beneficial effects of the utility model are as follows: the wind field guide structure of the additive manufacturing equipment pointed out by the utility model occupies a small space, and the airflow formed runs smoothly in the cavity with uniform wind speed, and reduces the probability of smoke and dust blocking the laser from reaching the sintering section, thereby improving the printing quality and printing stability of the workpiece to be printed. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative work, among which:
[0012] Figure 1 It is a three-dimensional diagram of a preferred embodiment of a wind field guide structure of an additive manufacturing device of the utility model;
[0013] Figure 2 yes Figure 1 A partial enlarged view of part A. DETAILED DESCRIPTION
[0014] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0015] See also Figure 1 Combination Figure 2 As shown, the embodiment of the utility model includes:
[0016] A wind field guide structure of an additive manufacturing device is arranged on a base 1, comprising a plasma discharge support column, a honeycomb guide plate 2, a fixing rod 3 and a discharge guide head 4. A protruding boss 5 is arranged in the middle of the base 1, and the center of the boss 5 is a powder laying forming area with a hollow structure that penetrates longitudinally.
[0017] The plasma discharge support column, honeycomb guide plate 2, fixing rod 3 and discharge guide head 4 are arranged in two groups in sequence and are located on both sides of the boss 5. An air outlet device that can effectively ensure the uniformity of the airflow entering the wind field is arranged on the air inlet side. After the gas is ionized, the airflow is evenly distributed in the air of the honeycomb structure, and a uniform wind field is formed above the powder forming area. During the printing process, the circulating wind field above the entire powder forming area always maintains a stable and uniform state, which can effectively ensure the sewage discharge capacity of the entire powder forming area and improve the quality of printed parts.
[0018] The plasma discharge support column comprises a first plasma discharge support column 6 and a second plasma discharge support column 7. The honeycomb guide plate 2 is distributed longitudinally and fixed on the base 1 at both sides through the first plasma discharge support column 6 to ensure stable fixation.
[0019] Two fixed rods 3 are arranged in parallel transversely, and both ends are fixed to the base 1 through the second plasma discharge support column 7 respectively. The discharge guide 4 is arranged in a transversely distributed Y-shaped structure. The discharge guide 4 is arranged toward the honeycomb guide plate 2, and the two forks on the fixed side are respectively fixed on the two fixed rods 3. The discharge guide 4 is provided with a plurality of them and is evenly distributed transversely between the two fixed rods 3 to provide sufficient ionized air.
[0020] Reinforcing rods 8 are respectively provided on the upper and lower sides of the two fixing rods 3 to be connected and fixed to the second plasma discharge supporting column 7 to increase the fixing stability.
[0021] Through the above structure, the stability between the circulating wind field and the powder laying and forming area is improved. The different wind speeds in the pipeline can adapt to the wind field diversion structure and meet the needs of the wind field during the printing process. While taking away the smoke and molten pool splashes during the laser scanning of the powder bed, it can also avoid the powder blowing phenomenon caused by uneven wind speed on the air outlet side, thereby improving the accuracy of metal powder after printing.
[0022] To sum up, the wind field guide structure of the additive manufacturing equipment pointed out in the utility model occupies a small space, and the airflow formed runs smoothly in the cavity with uniform wind speed, and reduces the probability of smoke and dust blocking the laser from reaching the sintering section, thereby improving the printing quality and printing stability of the workpiece to be printed.
[0023] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.
Claims
1. A wind field guide structure of an additive manufacturing device, arranged on a base, wherein a protruding boss is arranged in the middle of the base, and a powder laying forming area with a hollow structure that penetrates longitudinally in the center of the boss is provided, characterized in that: It includes a plasma discharge support column, a honeycomb guide plate, a fixed rod and a discharge guide head. The plasma discharge support column includes a first plasma discharge support column and a second plasma discharge support column. The honeycomb guide plate is distributed longitudinally and fixed on the base at both sides through the first plasma discharge support column. Two fixed rods are arranged in parallel transversely, and both ends are fixed on the base through the second plasma discharge support column respectively. The discharge guide head is arranged in a transversely distributed Y-shaped structure. The discharge guide head is arranged toward the honeycomb guide plate, and the two forks on the fixed side are respectively fixed on the two fixed rods.
2. The wind field guide structure of the additive manufacturing equipment according to claim 1, characterized in that: The plasma discharge supporting column, the honeycomb guide plate, the fixing rod and the discharge guide head are sequentially arranged in two groups and are located on both sides of the boss.
3. The wind field guide structure of the additive manufacturing equipment according to claim 1, characterized in that: The discharge guides are provided in plurality and are evenly spaced and laterally distributed between the two fixing rods.
4. The wind field guide structure of the additive manufacturing equipment according to claim 1, characterized in that: The upper and lower sides of the two fixing rods are respectively provided with reinforcing rods which are connected and fixed to the second plasma discharge supporting column.