Metal material mould moving type reciprocating extruding device suitable for one-way four-column hydraulic press

Abstract

The invention discloses a metal material mould moving type reciprocating extruding device suitable for a one-way four-column hydraulic press. The device comprises an upper ejector rod, a lower ejectorrod, a stress frame structure, a reciprocating extruding hydraulic cylinder, an extruding inner mold sleeve, upper padding, lower padding, a heating system, a hydraulic control system and other parts. According to the device, main pressure of an existing four-column hydraulic press is utilized for vertically locking the mould moving type reciprocating extruding device, then four hydraulic cylinders are utilized for achieving motion of the mould moving type reciprocating extruding device, the structure is simple, the cost is greatly reduced, the reciprocating extruding sped can be continuouslyadjusted, different requirements of different materials for different plastic deformation speeds can be met, and the application metal material range is wider. A reciprocating extruding blank (13) bears three-dimensional pressure stress actions, reciprocating extruding is carried out many times, the large deformation amount of the extruding blank (13) is accumulated, cracks, gaps and other structural defects in the metal deformation process are remarkably relieved, and meanwhile metal crystal grains can be effectively refined through reciprocating extruding.

Description

technical field [0001] The invention is a metal material mold-moving reciprocating extrusion device (hereinafter referred to as the reciprocating extrusion device) suitable for a one-way four-column hydraulic press, which belongs to the field of plastic deformation of metal materials. Background technique [0002] Large strain is the common development direction of various plastic deformation technologies. For example, traditional rolling developed into cumulative rolling (ARB), forging developed into multiple (directional) forging (MF), conventional extrusion developed into high ratio extrusion (HRE), and continued to evolve into equal channel angular extrusion (ECAEor ECAP ), reciprocating extrusion (RE or CEC), torsional deformation developed into high pressure torsion (HPT), etc. Plastic deformation techniques with large strains are called large plastic deformation techniques (SPD). Large plastic deformation technology, which has a strong ability to refine grains, can ...

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Problems solved by technology

However, at present, the reciprocating extrusion technology has not realized the real engineering application, mainly because of the following bottlenecks: 1. With the increase of extrusion billet specifications, the requirements for equipment capacity are higher, and the cost is higher; 2. The existing market lacks Appropriate bidirectional extrusion equipment realizes the reciprocating extrusion process, and in most cases special equipment is required; 3. Some studies have used the extrusion die to rotate up and down to realize the reciprocating extrusion process. On the one hand, the efficiency is low, and on the other hand, the extrusion process The medium billet is only subjected to unidirectional compressive stress, which has a weak effect on improving the internal defects of the material

4. High temperature reciprocating extrusion has higher requirements for extrusion dies, and the die loss is larger

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