Machining tool and machining method for deep taper hole of liquid rocket engine cavitation pipe

Abstract

The invention relates to a machining tool and a machining method for a deep taper hole of a liquid rocket engine cavitation pipe. The machining tool comprises a conical head and a reamer handle part,the conical head is of a 6-degree +/-5'conical structure, the molded surface is an arc tooth back, four cutting edges are evenly distributed on the molded surface, and each cutting edge has a 2-degreeedge inclination angle. The machining method of the deep taper hole comprises the steps that a reamer is adopted on a general lathe, the reaming procedure is divided into rough reaming, semi-finish reaming and finish reaming, the machining process is conducted in a pecking mode, and soybean oil is brushed for cooling. The reaming technology is adopted for machining the deep taper hole, compared with a traditional boring technology, the taper hole is good in roundness, tool vibration is little, the machining quality and consistency are good, each cutting edge of the conical finish reamer is ground into a special front-back angle and a special edge inclination angle, batch machining of deep taper holes in an expansion section of one liquid rocket engine cavitation pipe is achieved in cooperation with the machining method, abrasion of the reamer for machining the cavitation pipe taper hole is effectively reduced, the roughness of the inner surface of the hole is reduced, the machining efficiency of the cavitation pipe is improved, and the effect is remarkable in batch production.

Description

technical field [0001] The invention relates to a processing tool and processing method for a deep taper hole of a cavitation tube of a liquid rocket engine, in particular to a design scheme and a reaming method of a fine reamer for a deep taper hole of a liquid rocket engine, belonging to the deep taper hole of a liquid rocket engine processing technology field. Background technique [0002] Liquid rocket engine cavitation tube is an important part of the engine, mainly used for flow regulation of the engine system. The structure of the cavitation pipe is a trumpet-shaped part with a converging / expanding throat. When the liquid flows through the cavitation pipe, cavitation occurs in the throat. When the inlet pressure remains constant, the outlet flow can remain constant, and the flow rate will not change. Affected by back pressure, it can suppress the reverse transmission of pulsating pressure, so as to ensure that the system is in a stable working state. [0003] The ma...

AI Technical Summary

Problems solved by technology

Since the diameter of the deep taper hole changes from large to small, the traditional boring bar cannot be larger than the minimum diameter of the taper hole, resulting in a small diameter of the boring bar, which is very easy to vibrate during the machining process, resulting in the inability to guarantee the machining dimensional accuracy and surface roughness. Require

The rigidity of the variable-diameter boring bar is better than that of the ordinary boring bar during the machining process. However, due to the single-edged cutting and tool wear during the cutting process, it is easy to cause the roundness of the taper hole to decrease, and the dimensional consistency is poor. It is difficult to realize the cavitation tube. batch processing

The reaming process of ordinary conical reamer is used, the cutting edge wears seriously during the processing, the cutting edge is easy to break, there are grooves in the hole after processing, and the surface roughness is difficult to meet the requirements

With coated tapered reamer, its processing stability is better than that of boring process and ordinary tapered reamer, but the tool cannot be sharpened, and the cost of the tool is higher

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