Fiber hairbrush scraper

Abstract

The invention relates to a fiber hairbrush scraper for paving and conveying powder in a laser rapid forming process. The fiber hairbrush scraper consists of a supporting bracket and a hairbrush part, wherein a hairbrush is attached to the supporting bracket by virtue of an adhesive. In the powder paving process, on the one hand, when powder particles with the grain size being greater than the thickness of a powder paving layer enter between the scraper and a workpiece, the powder particles can be extruded, so that the frictional force between the scraper and the workpiece is increased; on the other hand, a metal solution is easily nodulized in a setting process. Problems on the above two aspects lead to bending deformation or movement of a formed piece in a forming process to affect the powder paving uniformity, so that the processing precision is reduced, or even the workpiece cannot be processed. The carbon fiber hairbrush scraper can be used for effectively solving the problem, and not only is suitable for the processing process of products with relatively great dimension, but also has advantages in processing microstructures. The carbon fiber hairbrush has the advantages of simple manufacturing, low processing cost, strong practicality, long service life and the like, is suitable for massive production and has a great economic benefit.

Description

technical field [0001] The invention relates to a carbon fiber brush scraper used in the laser rapid prototyping process, which is mainly used in the powder spreading process in the rapid prototyping process, is used to improve the precision of formed parts, and improves the service life of the scraper, belonging to the field of rapid prototyping. Background technique [0002] Since the 1990s, the market environment has undergone tremendous changes. On the one hand, consumer demands are becoming increasingly individualized and diversified; on the other hand, product manufacturers are focusing on fierce competition in the global market. [0003] In the face of a rapidly changing and unpredictable buyer's market, manufacturers not only need to design products that meet people's consumption needs quickly, but also must increase the speed of manufacturing to seize the market. Therefore, the traditional mass production mode can no longer meet the needs of rapid production. Respo...

AI Technical Summary

Problems solved by technology

In any of the above cases, the friction between the scraper and the workpiece will increase, which will not only affect the uniformity of powder spreading, but also accelerate the wear of the scraper

[0008] 2. Due to the large surface tension of the metal droplets after the powder is melted, the metal solution is prone to spheroidization during the solidification process. After the metal droplets solidify, hemispherical protrusions are formed on the surface of the forming layer. It is easy to collide with these protrusions when passing through these places, causing warping and deformation of the molded layer that has not been completely solidified or displacement of the molded part, thereby reducing the processing accuracy

[0013] (L is the distance from the contact point to the fixed point of the cantilever) if M 1 If it is too large, the cantilever of the formed part will be bent and deformed ( Figure 4 ), thereby reducing the processing accuracy

f 3 is the thrust in the horizontal direction on the formed part, if F 3 If it is too large, it will cause the shaking or movement of the molded parts, thereby reducing the machining accuracy and even causing the interruption of the machining process

Especially when processing microstructures, it is easy to deform the microstructures, reduce the machining accuracy of the microstructures, and even make the microstructures impossible to process.

[0014] 3. During the powder spreading process, the scraper continuously collides with the hemispherical protrusions formed by the spheroidization of the metal powder on the surface of the forming layer, which is prone to wear ( Figure 5 )

At the same time, friction occurs during the relative movement between the scraper and the powder, which is also the wear of the scraper, thereby reducing the service life of the scraper

This is caused by the defects of the steel material itself. Steel has high hardness and is not easy to deform, so the scraper can only collide with the protrusion rigidly. Under the action of long-term impact load, fatigue fracture will occur at the edge of the scraper. As a result, the blade is damaged, which in turn destroys the flatness of the blade and affects the accuracy of the formed part

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