Forming device and springback control method for a high-temperature alloy tension-bending cylindrical part

Abstract

The invention relates to a high-temperature alloy stretch bending curved cylindrical part forming device and a springback control method. The high-temperature alloy stretch bending curved cylindricalpart forming device comprises a mold, a loading mold, a medium bin and a plunger; the mold with a mold cavity is connected outside the loading mold in a sleeving manner, a cylinder blank is connectedbetween the mold and the loading mold in a sleeved manner, the medium bin is fixedly connected to the bottom of the mold, the plunger is slidably connected into the medium bin and the loading mold, the loading mold is internally provided with an injection channel, the injection channel is filled with a viscous medium, the arc face, opposite to the mold cavity, of the loading mold is provided witha plurality of output channels, the output channels are in communication with the injection channel, the opening diameters of the output channels are decreased along with increase of the radial depthof the mold cavity, and the number of the output channels in the axial direction is increased along with increase of the axial length of the mold cavity. The high-temperature alloy stretch bending curved cylindrical part forming device has the mode of controlling the viscous medium to load and unload through the difference of sizes of the injection channels of the loading mold, the internal stressdistribution is even after the high-temperature alloy cylindrical part forming, and the advantage of controlling stretch bending forming springback is achieved.

Description

technical field [0001] The invention relates to the technical field of sheet metal forming, in particular to a forming device and springback control method for a high-temperature alloy tension-bending cylindrical part. Background technique [0002] High-temperature alloy tension-bending cylindrical parts are typical thin-walled shell parts commonly used in the field of aviation and aerospace, such as figure 1 As shown, its main feature is a "V"-shaped bending form in the radial direction. Considering the uniformity of wall thickness, the billet should flow into the "V"-shaped deformation zone axially from both ends. During the deformation flow process, the billet is subjected to tensile stress and The role of bending, after deformation, due to the difference in stress distribution in the thickness direction of the blank, elastic recovery is very easy to occur, and the dimensional accuracy is reduced. This is a common problem for this type of parts. It is difficult to control...

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Problems solved by technology

[0002] High-temperature alloy tension-bending cylindrical parts are typical thin-walled shell parts commonly used in the field of aviation and aerospace, such as figure 1 As shown, its main feature is a "V"-shaped bending form in the radial direction. Considering the uniformity of wall thickness, the billet should flow into the "V"-shaped deformation zone axially from both ends. During the deformation flow process, the billet is subjected to tensile stress and The role of bending, due to the difference in stress distribution in the thickness direction of the blank after deformation, elastic recovery is very easy to occur, and the dimensional accuracy is reduced. This is a common problem for this type of parts. It is difficult to control the deformation of materials before and after forming.

[0003] In conventional stamping forming, the stress distribution of the section after the blank is bent and deformed under the action of bending moment is as follows: figure 2 As shown in (a), unloading is equivalent to imposing a hypothetical reverse elastic bending moment on the blank, and the stress distribution caused by the elastic bending moment in the section is as follows figure 2 as shown in (b), figure 2 The composite stress of (a) and 2(b) is the residual stress in the section in the free state after unloading, such as figure 2 As shown in (c), after unloading, the residual stress in the section of the billet is large and unevenly distributed, which will cause large springback, and it is easy to produce large springback near the apex of the deformation area. Therefore, conventional stamping cannot solve this problem. Severe Springback Problems of Superalloy Cylindrical Parts After Forming

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