Tube blank bilateral reverse central spindle thrusting reducing die and process

Abstract

The invention discloses a tube blank bilateral reverse central spindle thrusting reducing die and process. The process comprises the following steps that: in reducing, left and right reducing dies (9, 9/) are fed and reduced to the inner side of a tube blank (13) from the external end of the tube blank (13); meanwhile, a central spindle driving system pushes left and right central spindles (5, 5/) to do reverse motion to the external end of the tube blank (13) from the inner side of the tube blank (13); and after reduction, the left and right reducing dies (9, 9/) and the left and right central spindles (5, 5/) return, and a workpiece is fetched. The left reducing die assembly and the right reducing die assembly of the die are arranged between an upper template (11) and a lower die fixing plate (25), a left guide assembly and a right guide assembly are arranged at two sides of a lower fixing die (24), and the left central spindle assembly and the right central spindle assembly are respectively arranged in the left guide assembly and the right guide assembly. According to the invention, the central spindles are taken as parts for controlling the inside dimension of the tube blank, and a body of a self driving system hydraulic cylinder, the axial space of equipment is unnecessary to increase in reducing, and the amplification of deformation force is small in reducing, and after reducing, the increase of wall thickness of the tube blank is small and the inside dimension and outside dimension of the tube blank are high in precision.

Description

technical field [0001] The invention relates to the technical field of plastic forming of pipes, in particular to a diameter reduction process and a mold of a pipe blank with double-sided reverse mandrel pushing and reducing diameters. Background technique [0002] Pushing and shrinking the diameter is a forming method that makes the tube blank pass through a tapered die to reduce its outer diameter. According to whether there is a mandrel when the diameter is reduced, it can be divided into free diameter reduction and mandrel reduction. When the diameter is freely pushed and compressed, the length of the tube blank is elongated and the wall thickness increases after the diameter is reduced. When there is a mandrel pushing down the diameter, the increment of the wall thickness of the tube blank can be reduced. The mandrel can be floated without feeding, and the mandrel can also be fed synchronously with the reducing die, but the shrinking force is greatly increased, which is...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of large wall thickness increment and low precision of inner and outer diameters when the long-arm tube blank is pushed freely to shrink the diameter, and the large diameter shrinkage force when the mandrel pushes the tube blank to shrink the diameter, it is easy to cause the tube blank to be unstable, etc., the invention provides A tube billet double-sided reverse mandrel pushing and shrinking technology and mold, the invention effectively controls the wall thickness increment and the quality of the shrinking tube billet

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