Composite forming method and mold for sheet metal part with raised structure at the bottom

Abstract

The invention relates to a method and a die for combined forming of parts of a metal plate with a protrusion structure at the bottom. The metal plate comprises a deep-drawn part main body portion and a protrusion portion which are of an integral structure. The method is characterized by including the following steps for one-step forming of the metal plate: 1, blanking, namely blanking to form a deep-drawing blank; 2, back-pressure deep drawing, namely deeply drawing the blank falling from the former step, applying back pressure to compress the bottom of the deep-drawn part in the process of deep drawing of a back pressure block to realize deep drawing while compressing, allowing a metal material to flow into a small concave die of a forming protrusion while deep drawing, and simultaneously forming the main body portion and the protrusion portion. The die is small in processing load, uniform in stress and deformation, stable in processing course, capable of reducing contraction cavity defects at the protrusion and large in adaptability to processing material thickness. By the method, product quality is guaranteed, service life of the die is prolonged, product production efficiency is improved, and production cost is lowered.

Description

technical field [0001] The invention relates to a compound forming method and mold for a metal plate part with a raised bottom structure, which belongs to the production field of drawn metal parts with a raised bottom and similar parts, and relates to punching and drawing in plastic forming technology Deep, extrusion and other processes and composite forming die design. Background technique [0002] As we all know, lightweight is a development trend of electronic product manufacturing. Under the premise of meeting the material performance requirements and product functions, it is mainly achieved by simplifying the structure and minimizing the number of parts. For cavities, boxes and boxes that play a fixed role in electronic products, forming various protrusions on their inner surfaces to fix components is a manifestation of simplified structure, and the integrated design of protrusions and them also reduces parts. The number meets the lightweight manufacturing requirements...

AI Technical Summary

Problems solved by technology

[0004] Extrusion forming The protrusion leans against the punch to apply a large processing load, and the billet is extruded until it yields and then flows into the cavity for forming. The processing load is large, the life of the mold is short, and the stress on the sheet is concentrated, which belongs to local forming. Defects such as shrinkage cavities are prone to appear at the starting point, and the raised billet formed by reverse extrusion cannot be too thin, and the limitation is relatively large

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