A method for processing the substrate of a lobe diffuser
A processing method and diffuser technology, applied in the direction of machines/engines, jet propulsion devices, etc., can solve the problems of increasing the weight of components, low casting pass rate, difficult control of external dimensions and geometric shapes, etc., to achieve reliable quality, The effect of light structure and low cost
Active Publication Date: 2020-07-03
XIAN AEROSPACE PROPULSION INST +1
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Problems solved by technology
Limited by the casting process, the wall thickness of the wave lobe needs to meet the minimum wall thickness requirements of the casting process, which increases the weight of the component itself, which does not meet the requirements of lightweight engines; in addition, the pass rate of castings is not high. The shape is not easy to control, nor can it meet the requirements of subsequent mass production
Method used
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[0067] The present invention will be further described below in conjunction with accompanying drawing. The core technical issues of lobe diffuser matrix processing are elaborated in detail.
[0068] The specific process is as follows:
[0069] 1) Split the model and calculate the expanded size
[0070] Through the analysis, in order to form the parts well, choose the Image 6 The (A-B), (C-D) lines shown in the figure are divided, and the sheet metal forming analysis software DYNAFORM is used to carry out the calculation of the expansion of the blank. According to the calculated theoretical size, the machining allowance is 5mm / single side, and simplified. Calculate the specific size of the blank blank, as attached Figure 7 shown.
[0071] 2) Obtain the blank for forming by mechanical processing method
[0072] Layout according to the above size, and the blank can be processed by laser cutting or shearing blanking.
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The invention discloses a machining method of a lobe-type diffuser base body. The machining method comprises the following steps: (1) a model is divided, and the unfolded dimension is calculated; (2)a blank for forming is obtained through a machining process method; (3) preforming is conducted through a mold; (4) forming is conducted through the mold; (5) solution treatment is conducted for stress elimination; (6) reshaping is conducted through the mold; (7) assembling and welding are conducted; (8) subsequent machining is completed according to requirements of a drawing; and (9) surface treatment is conducted. The lobe-type diffuser base body is machined in the machining modes of divided lobe metal plate forming and welding; through the reasonable process design, mold design and weldingjig design, a product meeting drawing dimension requirements is finally achieved; and the machined product has the advantages of being low in cost, light in structure and reliable in quality.
Description
technical field [0001] The invention relates to a processing method for engine parts, in particular to a processing method for a lobe diffuser substrate, which belongs to the technical field of engine processing. Background technique [0002] Lobe diffusers are widely used in turbojet engines abroad, and in the past few decades, research on the application of lobe diffusers in turbojet engines has also begun in China. Compared with the traditional axisymmetric circular outlet nozzle, the lobe expander can improve the mixing effect by 200%, and it also has more outstanding performance in terms of mixing enhancement, noise reduction and infrared shielding. Many turbofan engines abroad also use this kind of diffuser. [0003] The lobe diffuser is assembled and welded by diffuser base, spoiler column, petal-shaped cover plate, circular cover plate and ring (as attached figure 1 shown), mainly used in fuel injection systems of combined engines. The diffuser base is the core pa...
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IPC IPC(8): B23P15/00
CPCB23P15/00F02K1/48
Inventor 石勇何建桥魏林冯定艳肖永印
Owner XIAN AEROSPACE PROPULSION INST