Aluminum or copper laser 3D printing blade face steel bar adhesive tape composite powder scraper

Abstract

The invention discloses an aluminum or copper laser 3D printing blade face steel bar adhesive tape composite powder scraper. The scraper comprises a front K-shaped rubber strip scraper, a blade face steel strip scraper and a rear K-shaped rubber strip scraper, the front K-shaped rubber strip scraper, the blade face steel strip scraper and the rear K-shaped rubber strip scraper are fixedly connected to a scraper rest, and the blade face steel strip scraper is located between the front K-shaped rubber strip scraper and the rear K-shaped rubber strip scraper. The K-shaped adhesive tape scraper and the rear K-shaped adhesive tape scraper are symmetrically arranged on the two sides of the blade face steel strip scraper, so the generation of bias torque is avoided, the powder scraping is uniform, and the powder scraping effect of the scraper is improved; the K-shaped adhesive tape scrapers on the two sides are main powder scraping cutters, meanwhile, the blade face steel strip scraper is adopted as an auxiliary cutter, local ultrahigh protrusions and spheroidized molten drops of each layer of printing are planed, and the protrusions are prevented from continuing to deteriorate.

Description

technical field [0001] The invention belongs to the technical field of 3D printing doctor blades, and in particular relates to a compound doctor blade with aluminum or copper laser 3D printing blade surfaces, steel strips and rubber strips. Background technique [0002] Aluminum or copper laser 3D printing is powder bed fusion. Using a laser, the powder particles are fused together point by point, and processed layer by layer until the object is complete. Powder bed fusion systems have heat sources and powder distribution control mechanisms. [0003] During the aluminum or copper laser 3D printing process, a large number of problems that equipment operators try to avoid can occur, including porosity, residual stress, warpage, cracks, localized ridges, etc. [0004] (1) Common defects of aluminum or copper laser 3D printing [0005] 1. Porosity [0006] During the laser 3D printing process of parts, very small holes inside will form porosity, which can be caused by the al...

AI Technical Summary

Problems solved by technology

[0010] 2. Residual stress

[0015] 3. Crack

[0018] 4. Warping

[0021] 5. Local uplift

Expansion or spheroidization causes local swelling of the aluminum or copper laser 3D printed workpiece, which may cause the risk of the scraper hitting the part

[0023] (2) Causes of defects in aluminum or copper laser 3D printing

[0025] The powder has impurity powder, the powder fluidity is not good, the powder particles are too large, and the powder reflectivity is too large

[0026] 2. Laser parameters are unreasonable

The laser scanning control is unreasonable, and the residual stress will increase

[0028] 3. Unreasonable powder scraping method

However, whether the aluminum or copper laser 3D printing can be successfully completed is closely related to the quality of the aluminum or copper powder scraping powder. At present, the performance of the existing rigid scraping powder and flexible scraping powder is not stable, especially for large cross-sectional area and large thickness. For large-sized and complex workpieces, the probability of successful printing at one time is very low

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