Precise extrusion molding method of thin wall long-pipe shaped parts bland and special mould

Abstract

The invention belongs to an extrusion forming technique of non-ferrous materials. The precise extrusion forming technique of a thin-wall long-tube part blank comprises two procedures, namely, a primary reverse extrusion and a secondary reverse extrusion; the primary reverse extrusion obtains a primarily extruded tube blank (18) by adopting a primary male die (7) and a primary concave die (8) by virtue of a primary backing-out punch (4), the secondary reverse extrusion is carried out by adopting a secondary fixed male die (16), a secondary movable male die (12), a secondary concave die (6) by virtue of a secondary backing-out punch (14); the secondary movable male die (12) is placed into the primarily extruded tube blank (18), the secondary fixed male die (16) moves downward along the secondary movable male die (12) to extrude the primarily extruded tube blank (18), therefore, the secondary reverse extrusion is completed. The thin-wall long-tube part blank produced by adopting the technique of the invention has the advantages that the internal quality, dimensional accuracy and the utilization ratio of materials are greatly improved, and the production efficiency is improved and the production cost is lowered.

Description

technical field [0001] The invention belongs to the extruding forming technology of non-ferrous metal materials, and mainly relates to a precision extruding forming method and a special mold for thin-walled long tubular part blanks. Background technique [0002] When domestic enterprises process thin-walled long tubular parts made of non-ferrous metals, there are two sources of parts blanks: casting thick-walled tube blanks and extruded thick-walled tubes. [0003] When processing parts with cast thick-walled tube blanks, its biggest disadvantages are: poor internal quality, defects such as pores and inclusions; defects are exposed after machining, and the scrap rate is high; the material utilization rate of the finished product is very low, and the machining workload Large; the hardness and strength after heat treatment are generally low. [0004] Although the application of equal-thickness extruded pipes overcomes most of the shortcomings of cast pipes, the disadvantages ...

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Problems solved by technology

[0003] When processing parts with cast thick-walled tube blanks, its biggest disadvantages are: poor internal quality, defects such as pores and inclusions; defects are exposed after machining, and the scrap rate is high; the material utilization rate of the finished product is very low, and the machining workload Large; the hardness and strength after heat treatment are generally low

[0004] Although the application of equal-thickness extruded pipes overcomes most of the shortcomings of cast pipes, the disadvantages of large machining volume and long processing cycle caused by the thin-walled and long tubular features of the parts still cannot be overcome, resulting in expensive parts; at the same time It is difficult to order a small amount of special-sized thick-walled pipes (small batches), and pipe manufacturers often cannot supply goods on time, which affects the normal production of downstream machining enterprises

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