Method for processing composite pipe shell with 120-degree equally divided straight flutes

Abstract

The invention discloses a method for processing a composite pipe shell with 120-degree equally divided straight flutes. The method comprises processing of an inner hole of the composite pipe shell and processing of the 120-degree equally divided straight flutes of the composite pipe shell. The method for processing the composite pipe shell with the 120-degree equally divided straight flutes provided by the invention is strong in maneuverability and high in production efficiency; and a clamping tool specially used for processing the inner hole of the special composite pipe shell is used during the processing of the inner hole of the composite pipe shell, so as to ensure that the processed inner hole of the pipe shell is concentric with an original datum hole, and the concentricity and the parallelism are within 0.01mm; an upper locating hole and a lower locating hole of the composite pipe shell are on the same perpendicular line and are high in accuracy; the composite pipe shell is fixed by a special tooling when the 120-degree equally divided straight flutes are processed; a special core mould base, a core bar and a special broach are designed, and the prepared 120-degree equally divided straight flutes inside the composite pipe shell have the advantages that the phenomena of large and small heads and waist drum shapes are avoided, the straightness can reach 0.01mm, no burr is generated, no anger is generated at the root part, and the roughness is up to Ra0.4 microns; a plurality of defects in the prior art can be overcome, and the method can be widely used.

Description

technical field [0001] The invention relates to a processing method of a traveling wave tube, in particular to a processing method of a composite tube shell with 120-degree equally divided straight grooves. Background technique [0002] Composite shells are widely used in the assembly of traveling wave tubes. The secondary processing of the inner hole of conventional composite shells is to locate the outer circle of the pole shoe on a slow-moving machine tool and cut the inner circle. There are three problems in this processing method: the solder flows to the outer circle of the pole shoe during welding, and the outer circle needs to be trimmed if it is out of circle, so it is difficult to ensure that the inner circle and the outer circle are concentric; when the shell is assembled, the inner hole is used for positioning, and the reference and assembly of the inner hole are cut. Datums are inconsistent; when there are heat sinks on the pole piece, there is no datum on the ou...

AI Technical Summary

Problems solved by technology

There are three problems in this processing method: the solder flows to the outer circle of the pole shoe during welding, and the outer circle needs to be trimmed if it is out of circle, so it is difficult to ensure that the inner circle and the outer circle are concentric; when the shell is assembled, the inner hole is used for positioning, and the reference and assembly of the inner hole are cut. Inconsistent datums; no datums on the outer circle when there are fins on the pole piece

And the processing of the three equal straight grooves of the composite pipe shell in the prior art adopts the wire cutting machine tool to directly cut the groove or use a simple broach to pull the groove

This processing method has the following three problems: the groove has a large and small head and a drum shape, and the bottom of the groove is not clear.

The roughness and straightness of the straight groove do not meet the requirements of the drawing, which affects the assembly accuracy of the helical wire component; the straight groove processed by wire cutting does not have secondary processability. If the groove depth is found to be insufficient during assembly, it cannot be reprocessed, and the shell can only be scrapped , the cost is high; the simple broach has no round hole positioning, three grooves are processed at the same time, the cutting edge of the broach cannot exclude cutting objects, the broach has no guide teeth, and no correction teeth, so the precision of the straight grooves processed is poor, and the symmetry is not good , this processing method has many man-hours and high cost

Images