Deep drawing method and device for sheet metal part
A technology of sheet metal parts and forming grooves, which is applied to the deep drawing forming method and forming device of sheet metal parts, and the deep drawing forming of parts with larger depths. In this field, it can solve the problems of large material flow resistance, inconsistent material thickness, and thinning of the bottom of the box shape, and achieve the effect of alleviating the fracture of deep drawing forming, improving the performance of deep drawing forming, and requiring low precision of the die
Inactive Publication Date: 2014-02-12
XIAN AIRCRAFT BRANCH OF XIAN AIRCRAFT INT
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Problems solved by technology
The biggest disadvantage of this kind of mold structure is: in the process of forming parts, the thickness of the material in contact with the blank holder ring is inconsistent, and the thickening is most obvious at the corner, which leads to the concentration of the blank holder here; therefore, the flow resistance of the material into the die is too large , the bottom of the box is obviously thinned and finally cracked and scrapped
If the blank holder force is increased, the parts are more likely to crack, and the reduction of the blank holder force cannot meet the effect of preventing wrinkling
Method used
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[0017] See attached picture: figure 1 It is the force analysis principle of part deep drawing. In the figure: F1 is the tensile force provided by the material itself, F2 is the force of the inflatable bag on the surface of the part, F3 is the friction force generated by the force of F2, and F4 is the die against the part. The blank holder force, F5 is the friction generated by the blank holder force.
[0018] figure 1 In the prior art deep drawing, the parts are mainly formed by the effects of F1, F4, and F5. Since the gap between the convex and concave molds is 1.1 times the material thickness, F2 and F3 are ignored. When F4 is small, F5 is also small, and the material flows too fast into the die, the parts are wrinkled seriously, and the surface quality is poor. When F4 is larger, F5 is also larger. The parts rely on F1 to provide power to resist F5 to promote the flow of materials to the die; the material in the danger zone will gradually become thinner due to plastic deformat...
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The invention provides a deep drawing method and device for a metal plate part; the device comprises a forming female die and a forming male die, and an inflatable rubber bag structure is arranged on the inner side wall of a forming groove of the forming female die. A rubber bag provides flexible pressure, from the inner side of the forming female die, to a plate part, the deep drawing breakage of the part is relieved, and even the function of transferring the breakage area of part can be achieved; a safe area during forming of a traditional drawing die is taken as a force transmission area, and the deep drawing performance of a material is improved.
Description
Technical field [0001] The invention relates to a forming technology of thin-walled plates, in particular to a drawing forming method and a forming device of sheet metal parts, and is especially suitable for deep drawing forming of parts with larger depths. Background technique [0002] At present, the general drawing die uses the concave die and the blank holder to clamp the wool and then moves downwards to form the parts on the punch; it is completely powered by the material's own tensile force to promote the part of the material in contact with the blank to flow into the die . The biggest disadvantage of this kind of mold structure is: in the process of forming the part, the thickness of the material in contact with the blank holder is inconsistent, and the thickening at the corner will most obviously cause the blank holder to concentrate here; therefore, the material flow resistance into the die is too large , The bottom of the box is obviously thinned and eventually cracked...
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IPC IPC(8): B21D37/10B21D22/20
Inventor 倪兴屹邱超斌段嘉庆
Owner XIAN AIRCRAFT BRANCH OF XIAN AIRCRAFT INT