Extrusion forming process of thin-wall long pipe-shaped part blank with flange and mould

Abstract

The invention belongs to extrusion forming technologies for non-ferrous metal materials and relates to a precise extrusion forming process of a thin-wall long pipe-shaped part blank with a flange. The forming process comprises two steps of primary backward extrusion and secondary forward extrusion, wherein in the step of primary backward extrusion, a primary backward extrusion convex mould (6) is utilized to match with a primary backward extrusion concave mould to together with a piece pusher (11) as an auxiliary for obtaining a primary backward extrusion pipe blank (17) with a web; a secondary forward extrusion convex mould consisting of a forward extrusion convex mould (14) and a mandrel (13) and a secondary forward extrusion concave mould (15) are utilized to carry out the secondary forward extrusion; and the secondary forward extrusion convex mould is placed into a primary backward extrusion pipe blank (18) and moves downwards to extrude the primary backward extrusion pipe blank (18) to obtain a secondary forward extrusion pipe blank (19) so as to finish a secondary forward extrusion process. The internal quality, the size precision and the material utilization rate of the produced thin-wall long pipe-shaped part blank with the flange are greatly improved; and meanwhile, the production efficiency is improved, and the production cost is reduced.

Description

technical field [0001] The invention belongs to the extruding forming technology of non-ferrous metal materials, and mainly relates to an extruding forming process and a die of a thin-walled long tubular part blank with a flange. Background technique [0002] At present, when processing thin-walled long tubular parts with flanges made of non-ferrous metals in China, there are two sources of part blanks: casting thick-walled tube blanks and extruded thick-walled tubes. [0003] The disadvantages of using cast thick-walled tubes to process parts are: due to defects such as pores and porosity, the internal quality is poor; machining exposes defects and has a high scrap rate; the material utilization rate of finished products is low, and the machining workload is large; it is difficult to pass Heat treatment enables the workpiece to achieve higher strength. [0004] Although the application of extruded thick-walled pipes overcomes most of the shortcomings of cast pipes, there a...

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Problems solved by technology

[0003] The disadvantages of using cast thick-walled tubes to process parts are: due to defects such as pores and porosity, the internal quality is poor; machining exposes defects and has a high scrap rate; the material utilization rate of finished products is low, and the machining workload is large; it is difficult to pass Heat treatment enables the parts to achieve higher strength

[0004] Although the application of extruded thick-walled pipes overcomes most of the shortcomings of cast pipes, there are still problems such as large consumption of machining materials, low material utilization, high price and difficulty in ordering.

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