Processing method of sealing teeth on the sealing surface of a certain type of high pressure turbine outer ring

Abstract

The invention belongs to the field of machining technology, and relates to an improvement in a machining method for sealing teeth on a sealing surface of an outer ring of a certain-type high-pressure turbine. The machining method is characterized in that a step of machining the sealing teeth (3) includes the steps of filling of teeth holder powder, solidifying, assembling of the outer ring of the high-pressure turbine, cutting, dissembling, removing of the teeth holder powder and cleaning. By the improved machining method for the sealing teeth on the sealing surface of the outer ring of the certain-type high-pressure turbine, the problem of difficulty in cleaning burrs of film holes (2) after lathing is solved, deburring efficiency is improved, and machining quality of an arc-section of the outer ring is guaranteed.

Description

technical field [0001] The invention belongs to mechanical processing technology, and relates to an improvement of a sealing tooth processing method on the sealing surface of a certain type of high-pressure turbine outer ring. Background technique [0002] The outer ring of a certain type of high-pressure turbine is composed of 27 outer ring arc segments 1 with the same structure along the circumference. Each outer ring arc segment 1 is a hollow structure. There are 4 rows of gas film holes 2, each row has 8 to 12 gas film holes, and the diameter of the gas film holes is 0.5mm to 0.8mm. 37 sealing teeth 3 are arranged, and the sealing teeth 3 penetrate the sealing surface of the outer ring arc section 1 along the arc direction; before processing the sealing teeth 3, the gas film hole 2 has been processed, and the outer ring arc section 1 The sealing surface is ground into a cylindrical surface. The current processing method is: first assemble 27 outer ring arc segments 1 o...

AI Technical Summary

Problems solved by technology

Its disadvantage is: in the process of cutting the sealing teeth 3 of the sealing surface of the outer ring, because there are air film holes 2 in the sealing surface of the outer ring arc section 1, there is intermittent cutting when cutting to the air film hole 2, A large number of flanging and burrs appear at the orifice of the gas film hole 2, resulting in the blockage of the gas film hole 2

There are obvious deficiencies in these three methods. One is that the outer ring arc section 1 is made of high-temperature alloy material with high hardness, and the port of the air film hole 2 has a space angle, which makes the efficiency of deburring low.

The second is that the tip of the tool is prone to break and block the small hole. In severe cases, the workpiece can be scrapped

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