Sheet metal plays a leading role in the forming of torque chamber of liquid rocket engine, its commercial connection hose manufacturing. Compared with general sheet metal, aerospace commodity sheet metal has many characteristics, such as variety, complex appearance design, high smoothness, strict dimensional tolerance, etc. Sheet metal. The appearance of sheet metal processing is designed before. The following methods are generally selected for the production processing of sheet metal appearance design: scribing cutting, wire cutting, plasma cutting machine, oxyacetylene numerical control flame cutting, stamping processing, high pressure water jet cutting machine CO2 fiber laser cutting. All kinds of laser cutting methods have their advantages disadvantages. Precision, speed cost are different. It has a certain application field in industrial production. It is a daily task for the liquid rocket engine sheet metal parts manufacturing to adopt a most convenient fast production processing method.

2. Selection of processing plan for typical sheet metal parts

2.1 structural features of sheet metal

(1) Name: deflector.

(2) Structural features: the inner surface of production processing is of irregular curve contour structure.

2.2 technical standards

The raw material is 1Cr18Ni9Ti thick steel plate with thickness of 62mm diameter. The refractive index of the inner contour of large pipe cutting is only changeable, but also too smooth, the standard tolerance is 35 [- 0.3 ~ - 0.1] mm according to law.

2.3 analysis of processing technology selection of processing technology plan

According to the part drawing structural characteristics of the above parts, there are several kinds of production process planning schemes available for selection:

(1) Stamping processing;

(2) Spark discharge wire cutting;

(3) High pressure water jet cutting machine;

(4) Fiber laser cutting.

2.4 analysis comparison of various processing technologies for 16 pieces of guide plate production daily task

2.4.1 stamping

Only 16 pieces are produced processed. Although the abrasives can ensure the precision of the inner contour, the period of the male mold for machining holes is short easy to break. The cost of the abrasives increases, the production processing time is long, which is uneconomical.

2.4.2 spark discharge wire cutting

The precision excessive surface finish can be ensured. However, if the cut of pipe is smooth, the threading hole must be produced first. The production processing speed is too slow. Unscientific (Note: WEDM processing parallel line segments fiber laser cutting precision surface roughness is very. However, if the production process random curve irregular curve, the precision surface roughness can be compared with fiber laser cutting).