A kind of processing method of nozzle

Abstract

The invention relates to a connecting pipe nozzle and a processing method thereof. The connecting pipe nozzle comprises a flow guide part and an annular connecting part; the flow guide part is L-shaped; an inner hole connected along the L shape is formed in the flow guide part; a through hole of the annular connecting part is provided with a step part arranged on the outer side surface of the connecting part; one end of the flow guide part is welded and connected with the inner side surface of the connecting part; the through hole communicates with the inner hole; the step part of the through hole and the inner hole are concentrically arranged; and when the connecting pipe nozzle is used, the step part is sleeved and connected with an external matching part, and the outer side surface of the connecting part is used as a connecting end surface to be fitted and matched with an external connecting part. During processing, the connecting pipe nozzle is clamped by using a soft claw matched with the annular outer edge of the connecting part of the connecting pipe nozzle, the inner side surface of the connecting part is used as a supporting surface, and the annular outer edge of the connecting part is clamped by the soft claw, so that the connecting pipe nozzle is convenient to clamp as well as accurate and reliable in location, the concentricity of the step part of the through hole of the connecting part and the inner hole of the flow guide part of the connecting pipe nozzle and the planeness of the connecting end surface are greatly improved, the production cost is reduced, and the production period of the connecting pipe nozzle is shortened.

Description

technical field [0001] The invention relates to the technical field of mechanical processing, in particular to a method for processing nozzles. Background technique [0002] The Ⅱ guide part in the starter of the aero-engine is an overhaul wearing part, and the nozzle is an important part of the Ⅱ guide part; its function is that the Ⅱ guide is connected with the corresponding parts on the connecting shaft of the Ⅱ guide through the nozzle, and the lubricating oil passes through Take over the nozzle to flow to the connecting shaft between guide II and guide II. Because when the connecting shaft of guide II is working, it rotates at high speed and generates a lot of heat. If there is no cooling of lubricating oil, the expansion of the connecting shaft will be unstable and cause failure to start. The cooling of the shaft affects the work of the starter. [0003] This type of nozzle is formed by welding the L-shaped flow guide part 1 and the ring-shaped connecting part 2 (suc...

AI Technical Summary

Problems solved by technology

[0012] In step D, the nozzle after welding is clamped. There are two existing clamping methods: one is to use a four-jaw chuck for clamping (such as figure 2 and image 3 ), respectively clamp the four claws on the upper end face 11, the lower end face 12, the left end face 13 and the right end face 14 of the guide part. Since the guide part is a precision casting, the verticality is not good, and the guide part and the connecting part are welded Deformation occurs, the through hole and the inner hole are deformed, it takes a long time to adjust when clamping and aligning the connecting end face, and the size consistency of the processed nozzle is poor, which greatly reduces the processing efficiency and cannot meet the processing needs

[0013] The second is to use assembly fixtures for clamping (such as Figure 4 and Figure 5 ), fix the assembly fixture on the lathe with three claws, position and support the rear end face 15, the lower end face 12, the left end face 13 and the right end face 14 of the guide part, and press the upper end face 11 of the guide part. Quickly complete the clamping of the nozzle. At the same time, because the rear end surface 15 of the flow guide part 1 is fixed, it is easy to align the connection end surface 21 of the connection part. The verticality of the end face 15 is poor, which will also cause the inner hole of the guide part and the step part of the through hole to be out of concentricity after turning, which cannot meet the assembly requirements

[0014] To sum up, the main disadvantages of previous tooling are as follows: difficult and complicated machining and clamping, difficult to guarantee the quality of parts machining, poor controllability of machining process quality, and unguaranteed machining accuracy. The degree of flatness is poor, and the flatness error of the connection end face is large, which cannot meet the assembly requirements. The pass rate of processed parts is only 50%, and the production efficiency is low.

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