Continuous Roll Forming Method for Curved Surfaces of Equal Thickness
A technology of roll forming and equal thickness, which is applied in the fields of rapid prototyping, continuous roll forming of thick curved surfaces, and low cost, and can solve the problems of uneven strength distribution, easy damage, weak strength, etc.
Inactive Publication Date: 2016-04-13
JILIN UNIV
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Problems solved by technology
The uneven thickness distribution of curved surface parts directly leads to the uneven strength distribution. Small thickness parts are weak and prone to damage. Designing parts according to the strength of the smallest thickness part will inevitably lead to waste of materials and increase of part weight
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[0040] The working process and implementation steps of the present invention will be further described below in conjunction with the accompanying drawings.
[0041] Such as Figure 1a , 1b , 2a and 2b, the continuous roll forming process of equal-thickness curved surfaces involved in the present invention is realized by two-pass rolling, and the sheet material 1 passes through two-pass continuous rolling of work rolls with a convex (or concave) profile, A three-dimensional curved surface part 2 with equal thickness is formed.
[0042] Such as Figure 1a , 1b As shown, the first pass of rolling is completed by a pair of upper work roll I3 and lower work roll I4 with the same concave roll profile, and a straight roll gap with variable gap along the transverse direction is formed between the upper and lower work rolls; in addition ,Such as Figure 4b As shown, the rolling of the first pass can also be completed by a pair of upper work roll III10 and lower work roll III11 with ...
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The invention provides a method of forming a constant-thickness three-dimensional curved surface part by a plate material, and belongs to the field of metal plastic processing. The method comprises the following steps: forming the constant-thickness three-dimensional curved surface part by performing two-pass rolling on the plate material by virtue of a convex (concave) working roll, wherein the first-pass rolling is completed by a pair of upper and lower working rolls with convex (or concave) roll outlines, a straight roll seam with a varied clearance in the transverse direction is formed between the upper and lower working rolls, and the plate material is changed into a variable-thickness pre-formed flat plate after being subjected to the first-pass rolling, the second-pass rolling is completed by a pair of upper and lower working rolls with concave and reverse roll outlines, an arc-shaped roll seam with an equal clearance in the transverse direction is formed between the upper and the lower working rolls, and the variable-thickness flat plate subjected to the first-pass pre-forming is changed into the constant-thickness three-dimensional curved surface part after being subjected to the second-pass rolling; controlling the longitudinal bending deformation of the finally formed three-dimensional curved surface by virtue of transverse distribution of the first-pass rolling roll seam clearance, and controlling the transverse bending deformation of the finally formed three-dimensional curved surface by virtue of the outline shape of the second-pass rolling arc-shaped roll seam.
Description
technical field [0001] The invention relates to a curved surface forming method, in particular to a continuous roll forming method for a curved surface of equal thickness, which belongs to the field of metal plastic processing and is suitable for low-cost and rapid forming of three-dimensional curved surface parts. Background technique [0002] In the manufacturing fields of aircraft, ships, high-speed trains, chemical containers, etc., as well as in modern architectural structures, urban sculptures, etc., the demand for three-dimensional curved surface parts is increasing day by day. The thickness of curved surface parts produced by traditional surface processing technologies such as mold forming, stretch forming, hydroforming, and spinning forming is usually uneven. The thickness is small where the deformation is large, and the thickness is small where the deformation is small. larger. The uneven thickness distribution of curved surface parts directly leads to the uneven ...
Claims
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IPC IPC(8): B21D5/14
CPCB21D5/14
Inventor 蔡中义吴皓杨振崔如坤胡维学胡志清
Owner JILIN UNIV