Machining method of closed covering cap type part with multiple reinforcing ribs
A processing method and rib technology, which is applied in the field of aviation sheet metal parts manufacturing, can solve problems such as large bending angle springback, height of ribs not meeting the design requirements, and out-of-tolerance dimensions, so as to avoid the accumulation of tolerances
Active Publication Date: 2022-08-09
SHENYANG AIRCRAFT CORP
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Problems solved by technology
The box-shaped part of 0.8mm ultra-thin material, after heat treatment, due to the release of internal stress of the material, the deformation is large, and the surface of the part appears bulging; in the hydraulic process, the plastic deformation of the material and the slender rib structure cause the bending height of the part Insufficient, even the maximum height difference of 3~4mm, more seriously, it will cause dense wrinkles or cracks at the ribs, and the height of the ribs does not meet the design requirements
Based on this, the present invention explores a processing method suitable for parts such as closed lids, designs special tooling suitable for the forming of such parts, solves the defects of out-of-tolerance dimensions, large bending angle rebound, and surface rib forming, and adopts a one-step forming method to replace ordinary The advanced hydroforming process method completes the precise manufacturing of parts, and proposes a processing method for aluminum alloy thin material closed lid parts with bending, sinking and reinforcing ribs at the same time
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[0015] The specific embodiments of the present invention are further explained below with reference to the embodiments and the accompanying drawings, but are not intended to limit the present invention.
[0016] According to the processing process of the closed cover parts with multiple reinforcing ribs, taking the 0.8mm ultra-thin cover parts with 3 flanges and 4 reinforcing ribs as an example, the processing method includes the following steps:
[0017] Step 1: Check the surface quality of the 0.8mm sheet. The surface is required to be smooth and clean, and no visible cracks, cracks, scratches, delaminations, non-metallic inclusions, bubbles, burns, corrosion spots, delamination, and residual oxidation are allowed. Skins, scars, metallic and non-metallic inclusions, roll marks in the form of indentations and protrusions and other surface defects up to a depth not exceeding the negative thickness deviation are tolerated.
[0018] Step 2: Adjust the distance between the rear b...
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Abstract
The invention provides a machining method for a closed covering cap part with a plurality of reinforcing ribs, and belongs to the technical field of aviation sheet metal part manufacturing. According to the method, multi-bent-edge web reinforcing rib sheet metal parts with different thicknesses are formed, tolerance accumulation caused by multiple times of positioning is avoided, and the problems that the depth of the reinforcing ribs of the sealing covering cap part meets the digital-analog requirement, the surface quality is in smooth transition, the appearance tolerance of the part in the natural state is smaller than or equal to 0.5 mm, and the hole site precision of holes around all the reinforcing ribs is + / -0.2 mm are fundamentally solved.
Description
technical field [0001] The invention belongs to the technical field of aviation sheet metal parts manufacturing, and relates to a processing method of a closed cover type part with a plurality of reinforcing ribs. Background technique [0002] In the manufacture of various structural parts of aircraft, the process of closed flap parts is particularly complex, especially in the design of modern large aircraft, the surface quality and manufacturing precision of closed flap parts are high, the surface contour is complex, and the geometric dimensions vary. The process is very difficult. The closed cover parts with multiple reinforcing ribs on the curved surface are characterized by a "box" shape, the heights of the surrounding flanges are different, and the three-sided flanges also have small hooks and sags, boxes. The curved surface is full of openings, the diameter of the openings ranges from φ25-φ87, and the specifications of the reinforcing ribs on the curved surface are dif...
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IPC IPC(8): B23P15/00
CPCB23P15/00B23P2700/01
Inventor 金妍鄢胜辉王晓臣姜秀玉张霞光
Owner SHENYANG AIRCRAFT CORP