3,350mm-level ellipsoid scalloped segment liquid-filling and forming process and die thereof

Abstract

The invention provides a 3,350mm-level ellipsoid scalloped segment liquid-filling and forming process and a die thereof. A hydromechanical deep drawing forming mode is adopted. The hydromechanical deep drawing forming mode comprises the following specific steps: a, cleaning: removing sundries on a molded surface of the die and the surface of a blank before liquid filling; b, uniformly smearing an integral molded surface of a male die of the die with lubricating oil; c, filling of a liquid filling chamber: enabling a liquid filling chamber of a female die to be filled with hydraulic oil; d, loading: placing the blank on the female die, adjusting the front and rear positions of the blank to enable the blank to be centered, and adjusting the liquid level of the liquid filling chamber to be parallel and level to the blank; e, paving an annular plastic film on one side, which is in contact with a blank holder, of the blank, and paving a plastic film of which the shape is consistent to that of the blank on the other side, which is in contact with the liquid filling chamber, of the blank; f, hydromechanical deep drawing of a part: controlling the matching relation between the pressure of the liquid-filling chamber and a blank holder force, and carrying out hydromechanical deep drawing forming on the blank; and g, unloading. A one-time liquid-filling forming process is adopted, liquid-filling forming of a 3,350mm-level ellipsoid scalloped segment is realized, a qualified product which meets use requirements is obtained, and the quality of the surface of the part and the precision of the molded surface are improved remarkably.

Description

technical field [0001] The invention belongs to the technical field of forming ellipsoidal melon petals, and in particular relates to a 3350mm-level ellipsoidal melon petal liquid-filled forming process and a mold thereof. Background technique [0002] In the research and development launch vehicle, the bottom structure of the Ф3350mm box is a square melon petal structure, and the size of the parts is about 1300mm×1300mm. The product structure is as follows figure 1 As shown, the raw material used is 6mm-10mm annealed 2219 aluminum alloy, and the product needs to be quenched and artificially aged. At present, such products are produced by deep drawing with a rigid die using a large-tonnage hydraulic press. [0003] The melon petals of the 3.35-meter-class storage tank of the active launch vehicle adopt the traditional deep-drawing forming process, which is formed in two passes and quenched in the middle. In the prior art, the manufacturing process of Ф3350mm ellipsoidal me...

AI Technical Summary

Problems solved by technology

[0005] (1) The surface accuracy is not easy to guarantee, and a lot of manual trimming is required;

[0006] (2) The trimming marks bring certain difficulties to the subsequent processing technology;

[0007] (3) The mechanical properties of the product are unstable, and the mechanical properties of some products do not meet the design requirements;

[0008] (4) Surface roughness caused by "coarse grain" often occurs

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