Flexible four-point bending pre-bending fixture for aging formation

Abstract

The invention belongs to manufacturing technology, and relates to a flexible four-point bending pre-bending fixture for aging formation in wallboard deformation. The pre-bending fixture includes a base plate, supporting blocks, a gantry bracket, pressure heads, sliding plates and adjusting screw rods, wherein the base plate is rectangular; two elongated slots are uniformly distributed in the length direction and the width direction of the base plate respectively; one supporting block is arranged at each end of the base plate in the length direction, and is fixed on the base plate; the upper surface of each supporting plate is circular arc; the gantry bracket is fixed in the middle of the base plate; the sliding plates are mounted on the gantry bracket by through holes therein; four elongated slots are uniformly distributed in the sliding plates, and are arranged in the same way as the elongated slots of the base plate; one pressure head is arranged at each end of each sliding plate in the length direction, each pressure head is connected with each sliding plate; the lower surface of each pressure head is circular arc; and adjusting screw rods penetrate through threaded holes at the centers of cross beams of the gantry bracket to be fixed with the sliding plates. As the flexible four-point bending pre-bending manner is adopted, the pre-bending amount of a test piece is uniform and adjustable, and test fixtures are reduced at the same time.

Description

technical field [0001] The invention belongs to the manufacturing technology, and relates to a flexible four-point bending pre-bending fixture used for aging forming in panel forming. Background technique [0002] Age forming technology or age creep forming technology is a technology developed in the early 1950s for forming integral wall panel parts. This forming method is suitable for forming integral ribs of age-strengthenable alloys and integral panel members with variable thickness, large curvature, complex shape and structure, and is considered to be one of the particularly important metal forming processes for the next generation of large civil aircraft. [0003] The basic principle of aging forming technology is: combining artificial aging with part forming, that is, using aging treatment to obtain the required properties of aluminum alloy, and at the same time using the creep deformation of the material at a certain temperature (artificial aging temperature) under th...

AI Technical Summary

Problems solved by technology

[0005] When pre-bending the specimen by mechanical pressure, there are two types of test fixtures commonly used at present: one is a solid arc surface fixture (such as figure 1 ), that is, one pre-bending amount corresponds to one fixture, and the fixture needs to be replaced every time a pre-bending radius is formed. The advantage of this type of fixture is that the pre-bending deformation is uniform, and the test piece has no concentrated force. The disadvantage is high cost and low efficiency.

The other is a three-point bending flexible pre-bending fixture (such as figure 2 ), the advantage of this type of fixture is that the amount of pre-bending can be adjusted, a set of molds can form multiple parts, and cost savings, but the disadvantage is that the specimen is subjected to concentrated force, the bending moment changes along the length of the specimen, and the pre-deformation is uneven

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