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Spherical surface frame of airplane body and method for manufacturing spherical surface frame

A manufacturing method and a technology for an aircraft fuselage, which are applied to the spherical frame of the aircraft fuselage and the manufacturing field thereof, can solve the problems of low fiber volume content, large safety factor, large porosity of liquid forming products, etc., and achieve the effect of solving the problem of precision manufacturing

Active Publication Date: 2012-07-18
COMAC +1
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Problems solved by technology

However, it is precisely because of its good fiber deformation performance that the fiber direction deviates from the design angle, and the liquid formed product has a large porosity and low fiber volume content, so it needs to be designed with a large safety factor, resulting in a large weight

Method used

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  • Spherical surface frame of airplane body and method for manufacturing spherical surface frame
  • Spherical surface frame of airplane body and method for manufacturing spherical surface frame
  • Spherical surface frame of airplane body and method for manufacturing spherical surface frame

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specific Embodiment

[0047] After obtaining the curved surface of the ball skin (assuming that the radius of the sphere where the curved surface is located is 2200mm), according to the width of the one-way belt (assumed to be 300mm) and the circumference of the meridian of the surface, it is determined that the spherical surface needs to be divided into at least 11 pieces, and the n value of the sphere corresponding to the curved surface of the ball skin is 49. According to the gap Δt=Rcosα(tgл / n−л / n), the maximum gap Δt is 0.198mm (α=0, on the meridian plane). Since the size of the notch is very small, according to the size of the largest notch on the meridian plane, the plane expanded with equal area is corrected to increase its width by 0.2mm, and the one-way tape is cut according to the corrected expansion diagram.

[0048] After determining the unfolding method of the single-layer curved surface, according to the thickness requirements of the structure and the thickness of the single-layer pr...

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Abstract

The invention provides a method for manufacturing a spherical surface frame of an airplane body. The method comprises the following steps of: acquiring a spherical skin curved surface according to the design requirement of an airplane; dividing the spherical skin curved surface into a plurality of strip-type parts, and unfolding the strip-type parts to form a plane by an equal-area method; determining that gaps delta t between theoretical boundaries and actual boundaries of the strip-type parts are equal to R cos alpha(tg pi / n-pi / n), wherein R is the radius of a sphere in which the spherical skin curved surface is positioned, alpha is included angles between the gaps and a meridian plane of the sphere, and n is the number of the strip-type parts divided on the sphere; shearing a unidirectional tape prepreg material by combining the sizes of the gaps with the shape of the plane formed by unfolding the strip-type parts; paving the shorn unidirectional tape prepreg material on a die for the spherical surface frame; curing for forming by using an autoclave; and machining complementally. The invention also provides the spherical surface frame of the airplane body, which is manufactured by the method. The spherical surface frame can meet the requirements of light weight and high strength.

Description

technical field [0001] The invention relates to an aircraft fuselage spherical frame and a manufacturing method thereof, in particular to an aircraft fuselage spherical frame paved with a unidirectional tape prepreg material and a manufacturing method thereof. Background technique [0002] Composite materials are widely used in aerospace structures because of their unique properties. The application of advanced composite materials in the main load-bearing structure of aircraft, increasing the amount of advanced composite materials used in aircraft structures, has become an important indicator to measure the advancement of aircraft structures, and it is also an important factor for reducing aircraft development costs and improving aircraft performance and market competitiveness. One of the means. [0003] The spherical frame is the rear end frame of the aircraft fuselage, which mainly bears the airtight pressure. The traditional spherical frame is a metal riveted structure,...

Claims

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Application Information

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IPC IPC(8): B29C70/44
Inventor 周良道李萍宫占峰
Owner COMAC
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