Control Method of Residuals in Machining Process of Cavity with Annular Gap

Abstract

The invention provides a method for controlling excess objects in cavities with annular gaps during a machining process. The method is as follows: before machining the molded surface of a cavity, adopting clean animal fat as an annular gap filler, and using a spring steel sheet to block an annular gap inlet, so as to prevent large cuttings, fine cuttings and cutting fluid from entering the product cavity; after machining, adopting heat treatment, hot steam blowing, ultrasonic cleaning and under-pressure cleaning processes to clean the lard in the cavity annular gap, so as to ensure that the cleanliness of the product cavity meets requirements. According to the invention, the technical problem of excess objects prevention and control during the machining process of the shell of a pintle-type injector in the thrust chamber of a liquid-propellant rocket engine is effectively solved, thereby avoiding the impact of the excess objects on the product performance and improving the operational reliability of the product.

Description

technical field [0001] The invention belongs to the technical field of liquid rocket engine manufacturing, and mainly relates to a method for controlling redundant matter in the processing of a pintle type injector shell in a thrust chamber of a liquid rocket engine. Background technique [0002] Due to its simple structure, low cost, and excellent performance, the pintle thrust chamber has obvious advantages in the field of variable thrust engines and low-cost booster engines. Due to the integrated design of the pintle injector, the difficulty of processing the shell of its important parts and the difficulty of excess control are greatly increased. The injector shell processing process is long, covering shell blank processing, shell semi-finished welding and shell precision machining. It will affect the performance of the product, and in severe cases, it will lead to a decrease in engine performance, or even failure of the launch mission. [0003] In the conventional proc...

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Problems solved by technology

The injector shell processing process is long, covering shell blank processing, shell semi-finished welding and shell precision machining. Affect the performance of the product, in severe cases, it will lead to a decrease in engine performance, or even failure of the launch mission

[0003] In the conventional processing process, the entrance of the annular gap is often blocked by sticking insulating tape to prevent excess material from entering the inner cavity of the product. The effect of cutting temperature and cutting temperature makes the tape easy to fall off, causing cutting fluid, chips, etc. to enter the annular gap of the product and produce excess; the excess that enters the annular gap is difficult to remove and clean with conventional cleaning methods, bringing safety to the use of the product Hidden danger

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