Grinding method of inner wall surface of 3D printing rocket engine combustor

Abstract

The invention discloses a grinding method for the inner wall surface of a 3D printing rocket engine combustion chamber. The grinding method comprises the following steps that the combustion chamber ismounted on a grinding device; a boron carbide grinding paste fills the part between a mandrel of the grinding device and the inner wall of the combustion chamber for coarse grinding, the mesh numberof the boron carbide grinding paste is 80-120 meshes, the rotating speed of the mandrel is 1300-1500 r / rad, and the grinding time is 5-7 h; and a diamond grinding paste fills the part between the mandrel of the grinding device and the inner wall of the combustion chamber for fine grinding, the mesh number of the diamond grinding paste is 18-22 meshes, the rotating speed of the mandrel is 3000-4000r / rad, and the grinding time is 1.5-2.5h. According to the grinding method, the surface roughness of the inner wall of the whole combustion chamber is uniform after grinding is completed, moreover, the wall thickness dimension of the inner wall of the combustion chamber can be ensured to be consistent, the phenomenon of uneven thickness is avoided, the cost is low, and the performance is stable.

Description

technical field [0001] The invention relates to the technical field of a method for treating the inner wall surface of a rocket engine combustion chamber, in particular to a method for grinding the inner wall surface of a 3D printed rocket engine combustion chamber. Background technique [0002] With the development of industrialization, 3D printing technology has developed rapidly as an emerging industry, bringing about huge changes to the traditional machining industry. Especially in the field of aerospace, with the continuous development and improvement of 3D printing technology, it has begun to be used in many complex structural parts. [0003] The combustion chamber is a key component of the liquid rocket engine. The propellant is mixed and ignited in the combustion chamber, which generates a high temperature of nearly 3000 ° C. Therefore, there must be a complex cooling channel between the inner and outer walls of the combustion chamber. In the past, traditional combus...

AI Technical Summary

Problems solved by technology

3D printing technology can improve the traditional process, provide new design and performance, and greatly reduce this time. However, because 3D printing technology is made of very fine metal powder accumulation and sintering, the surface of the formed product has a grainy feel, which cannot be achieved. Roughness of conventionally machined surfaces

However, the current manual grinding is prone to uneven roughness or local thickness out of tolerance, resulting in unqualified products.

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