Powder spreading mechanism and powder spreading device

Abstract

The utility model belongs to the field of additive manufacturing, and relates to a powder spreading mechanism and a powder spreading device, and the powder spreading mechanism comprises a scraper and a vibration module arranged on the scraper. According to the powder spreading mechanism and the powder spreading device, the compactness and the flatness of a powder layer can be improved, and the 3D printing powder spreading quality can be improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of additive manufacturing, and relates to a powder spreading mechanism and powder spreading device. BACKGROUND

[0002] In a metal powder 3D printing device, the doctor blade powder spreading is one of the key process steps. The purpose of this step is to evenly spread a thin layer of metal powder on the forming chamber base material to provide preparation for laser melting. However, when using the traditional doctor blade powder spreading method to spread powder, the spread powder layer is loose and uneven, the density is insufficient, and the powder layer cannot be compacted. Especially when spreading ultra-fine powder, referring to Figure 1 and Figure 2 , the powder layer is pushed to move, and it is more likely that part of the powder will be aggregated or loose, the spreading will be uneven, the porosity will be large, and the printing precision will be inevitably reduced, thereby affecting the forming quality. SUMMARY

[0003] In order to solve the above technical problems in the background art, the utility model provides a powder spreading mechanism and powder spreading device which can improve the powder layer compactness and flatness and improve the 3D printing powder spreading quality.

[0004] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0005] A powder spreading mechanism, characterized in that: the powder spreading mechanism comprises a doctor blade and a vibration module arranged on the doctor blade.

[0006] The powder spreading mechanism further comprises a doctor blade vibration fixing seat; the vibration module is arranged on the doctor blade through the doctor blade vibration fixing seat.

[0007] The vibration module is a mechanical vibration assembly, an electric vibration assembly, an electro-hydraulic vibration assembly, an electromagnetic vibration assembly, a piezoelectric vibration assembly or a magnetostrictive vibration assembly.

[0008] The vibration module is one or more groups.

[0009] The powder spreading mechanism further comprises a doctor blade fixed drag seat; the doctor blade vibration fixing seat is arranged on the doctor blade fixed drag seat.

[0010] The doctor blade fixed drag seat comprises a horizontal section and a vertical section connected with the horizontal section, and the doctor blade fixed drag seat as a whole has an L shape, and the doctor blade vibration fixing seat is movably arranged on the horizontal section of the doctor blade fixed drag seat.

[0011] A counterweight is arranged on the doctor blade vibration fixing seat.

[0012] The powder spreading mechanism further comprises a vibration isolation module arranged between the doctor blade vibration fixing seat and the vertical section of the doctor blade fixed drag seat.

[0013] The above-mentioned vibration isolation module is a spring isolator, a rubber isolator, an air spring isolator or a vibration isolation pad.

[0014] The powder spreading device is characterized in that the powder spreading device comprises a scraper frame and the powder spreading mechanism as described above; the powder spreading mechanism is arranged on the scraper frame and moves synchronously with the scraper frame.

[0015] The powder spreading device has the advantages that:

[0016] The utility model provides a kind of powder spreading mechanism and powder spreading device, and the powder spreading mechanism includes scraper and vibration module being set on scraper.The utility model adopts vibration module, corresponding vibration frequency and amplitude can be generated to scraper, make scraper uniform vibration in powder spreading process Powder layer, it can solve the problem of traditional scraper powder spreading mode of metal powder 3D printing equipment to exist loose and unevenly dense powder spreading, can realize the demand of dense and uniform powder layer of scraper powder spreading mode, improve 3D printing equipment powder spreading quality.Meanwhile, the utility model uses scraper fixed drag seat and vibration isolation module to cooperate, it plays the role of guiding to scraper, while reducing the influence of vibration to scraper frame, can improve the stability and reliability of powder spreading process. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 And Figure 2 They are working condition diagrams of prior art in actual powder spreading respectively;

[0018] Figure 3 It is the overall mechanism schematic diagram of the powder spreading mechanism provided by the utility model;

[0019] Figure 4 And Figure 5 They are working condition diagrams of the powder spreading mechanism provided by the utility model in actual powder spreading respectively;

[0020] Figure 6 It is the working condition diagram when powder layer is destroyed after completing powder spreading based on the powder spreading mechanism provided by the utility model;

[0021] Among them:

[0022] 1-scraper;2-scraper fixed drag seat;3-vibration isolation module;4-vibration module;5-scraper vibration fixed seat. DETAILED DESCRIPTION

[0023] Referring to Figure 3The utility model provides a kind of powder laying mechanism, including scraper 1, scraper vibration fixed seat 5 and vibration module 4 being set on scraper 1, vibration module 4 is set on scraper 1 by scraper vibration fixed seat 5.Scraper 1 is connected together with scraper vibration fixed seat 5, by vibration module 4 generates certain frequency and amplitude, is transferred to scraper 1, forces scraper 1 to vibrate in powder laying process, realizes the function that the powder layer that is laid vibrates evenly dense.

[0024] The utility model adopts vibration module 4 can be mechanical type vibration subassembly, electric type vibration subassembly, electrohydraulic type vibration subassembly, electromagnetic type vibration subassembly, piezoelectric type vibration subassembly or magnetostrictive type vibration subassembly. Among them, mechanical type vibration subassembly is excited by centrifugal force generated by rotating unbalanced mass, exemplary, mechanical type vibration subassembly can adopt eccentric rotation motor.Electric type vibration subassembly is excited by the interaction of constant magnetic field and coil with certain current in magnetic field, exemplary, the electric type vibration subassembly can adopt voice coil motor.Electrohydraulic type vibration subassembly is the capacity conversion device consisting of electrohydraulic servo valve and hydraulic actuator cylinder, and the energy of high-pressure fluid flowing out of oil pump is converted into exciting force.Electromagnetic type vibration subassembly can adopt electromagnetic vibration table;Piezoelectric type vibration subassembly can adopt piezoelectric ceramic;Magnetostrictive type vibration subassembly can select magnetostrictive vibrator.It needs to be explained that vibration module 4 can be according to specific scraper size parameter, can select one or more vibration modules to meet the amplitude and frequency required in powder laying process.

[0025] Powder laying mechanism also includes scraper fixed drag seat 2;Scraper vibration fixed seat 5 is placed on scraper fixed drag seat 2.In use, by counterweight of scraper vibration fixed seat 5, the gravity center of scraper 1, vibration module 4 and scraper vibration fixed seat 5 is designed to above scraper fixed drag seat 2, guarantee the stability of entire powder laying process.Scraper fixed drag seat 2 includes horizontal section and vertical section, and the whole is L-shaped, and scraper vibration fixed seat 5 is movably arranged on the horizontal section of scraper fixed drag seat 2.At the same time, by increasing counterweight on scraper vibration fixed seat 5, the gravity center of scraper 1, vibration module 4 and scraper vibration fixed seat 5 is controlled on the horizontal section of scraper fixed drag seat 2.

[0026] The powder laying mechanism further comprises a vibration isolation module 3 arranged between the scraper vibration fixing seat 5 and the vertical section of the scraper fixing seat 2. The vibration isolation module 3 is a vibration isolation module with a certain rigidity, which not only isolates the vibration generated by the vibration module 4 and reduces the influence on the scraper fixing seat 2, but also cooperates with the scraper fixing seat 2 to play a guiding (when vibrating, the vibration module 4 drives the scraper vibration fixing seat 5 to vibrate, the scraper vibration fixing seat 5 drives the scraper 1 to vibrate synchronously, and since the counterweight is arranged above the scraper vibration fixing seat 5, the scraper vibration fixing seat 5 is limited in the vertical direction and can only drive the scraper 1 to make a horizontal micro-movement vibration on the horizontal section of the scraper fixing seat 2, thereby playing a horizontal guiding role) and supporting role during powder laying. For example, the vibration isolation module 3 is a spring vibration isolator, a rubber vibration isolator, an air spring vibration isolator or a vibration isolation pad. For example, the vibration isolation pad can be any one of cork, felt, rubber pad and glass fiber plate.

[0027] The utility model discloses a powder laying mechanism as described above, and further provides a powder laying device formed based on the powder laying mechanism, which comprises a scraper frame and the powder laying mechanism as described above; the powder laying mechanism is arranged on the scraper frame and moves synchronously with the scraper frame.

[0028] Referring to Figure 4 and Figure 5 , when the powder laying mechanism provided by the utility model works, the base material roughness is 0.8 (the base material surface is smooth) and the ultrafine powder (for example, the particle size of the ultrafine powder is 0-20 μm) is used for powder laying. Since the vibration module 4 generates vibration frequency and amplitude for the scraper 1 and transmits the vibration frequency and amplitude to the scraper 1, the scraper 1 is forced to vibrate during powder laying, thereby realizing the function of uniform and compact vibration of the powder layer, forming the functions of "smoothing" and "vibrating", promoting the powder layer to be flat, smooth and compact, avoiding the defects of powder aggregation or loosening and uneven paving, effectively improving the printing precision and forming quality. Meanwhile, referring to Figure 6 , the powder layer is damaged, and the compactness and tightness of the cross section of the powder layer are clearly visible. In addition, no large pores are visible to the naked eye, which sufficiently proves that the porosity is small and can meet the needs of actual production.

Claims

1. A powder laying mechanism characterized by: The powder spreading mechanism comprises a scraper (1) and a vibration module (4) arranged on the scraper (1).

2. The powder spreading mechanism of claim 1, wherein: The powder spreading mechanism further comprises a scraper vibration fixing seat (5); the vibration module (4) is arranged on the scraper (1) through the scraper vibration fixing seat (5).

3. The powder spreading mechanism of claim 2, wherein: The powder spreading mechanism further comprises a scraper fixing seat (2); the scraper vibration fixing seat (5) is arranged on the scraper fixing seat (2).

4. The powder spreading mechanism of claim 3, wherein: The scraper fixing seat (2) comprises a horizontal section and a vertical section connected with the horizontal section, and the scraper fixing seat (2) is in an L shape as a whole; the scraper vibration fixing seat (5) is movably arranged on the horizontal section of the scraper fixing seat (2).

5. The powder spreading mechanism of claim 4, wherein: The scraper vibration fixing seat (5) can move along the length direction of the horizontal section on the scraper fixing seat (2).

6. The powder spreading mechanism of claim 5, wherein: The scraper vibration fixing seat (5) is provided with a counterweight.

7. The powder spreading mechanism of claim 6, wherein: The powder spreading mechanism further comprises a vibration isolation module (3) arranged between the scraper vibration fixing seat (5) and the vertical section of the scraper fixing seat (2); the vibration isolation module (3) is a spring isolator, a rubber isolator, an air spring isolator or a vibration isolation pad.

8. The powder spreading mechanism according to any one of claims 1 to 7, characterized in that: The vibration module (4) is a mechanical vibration assembly, an electric vibration assembly, an electro-hydraulic vibration assembly, an electromagnetic vibration assembly, a piezoelectric vibration assembly or a magnetostrictive vibration assembly.

9. The powder spreading mechanism of claim 8, wherein: The vibration module (4) is one or more groups.

10. A powder spreading device characterized by: The powder spreading device comprises a scraper frame and the powder spreading mechanism according to claim 9; the powder spreading mechanism is arranged on the scraper frame and moves synchronously with the scraper frame.

Images