Double-ironing cyclic extrusion solidification method for remanufacturing titanium abandoned cuttings

Abstract

The invention provides a double-ironing cyclic extrusion solidification method for remanufacturing titanium abandoned cuttings. The method includes the following steps of (1), recycling and pretreatment of the Ti cuttings, specifically, the Ti cuttings are cleaned for removing oil stains and impurities; (2), BM treatment of the Ti cuttings, specifically, the Ti cuttings pretreated in step (1) are subjected to ball milling; (3), sleeving and packaging of the BM-Ti cuttings, specifically, the BM-Ti cuttings are loaded into a copper barrel cavity, and then the cuttings are compressed preliminarily by a manual pressing machine; (4), room temperature cold squeezing of the sleeved and packaged BM-Ti cuttings; (5), double-ironing cyclic extrusion high-temperature solidification machining; (6), ejection and demoulding of a Ti material sample, specifically, an upper punch pin is removed, a pure-aluminum pseudo sample is placed in a die lower cavity, and a lower punch pin provides extension force to push the remanufactured Ti material obtained in step (5) for demoulding; (7), quenching, specifically, a block Ti material obtained in the ejection step (6) is quenched in a water cooling manner and cooled to the room temperature.

Description

technical field [0001] The invention belongs to the field of metal material processing, and relates to solid-phase recycling and reuse of waste metal resources, especially for titanium resources with high smelting costs, and develops a new technology for efficient and clean titanium chip remanufacturing. In particular, it relates to a double-shrinking circular extrusion solidification method for remanufacturing waste titanium chips. Background technique [0002] Titanium is a metal resource with high smelting costs. It has excellent biocompatibility, good corrosion resistance, and suitable mechanical properties. It is an important material for manufacturing medical devices, artificial joints, and large energy and chemical containers. However, in order to manufacture high-precision Ti structures, a large machining allowance needs to be designed, and a large amount of raw materials will be converted into waste chips. The traditional high-temperature melting and casting proces...

AI Technical Summary

Problems solved by technology

However, titanium (Ti) is an active metal that is easy to oxidize. The oxide on the chip surface exists in the form of TiO2, and its texture is tough. Although the oxide can be broken and dispersed to a certain extent after multiple passes of ECAP treatment, the larger oxidation The continuous distribution of substances will form metallurgical defects in the microstructure, weakening the mechanical properties of the material

There is also a refinement limit in ECAP processing, that is, when the dynamic recrystallization and strain refinement effects are balanced, it will be difficult for ECAP to further refine the microstructure.

At the same time, after the powder is processed by BM, subsequent processing processes such as hot pressing sintering or powder extrusion / forging are required to obtain bulk materials. In these processes, due to factors such as long heating (sintering) time and dynamic recrystallization, Grain coarsening will occur, weakening the strength of the material

Moreover, the processing efficiency of traditional hot extrusion technology still needs to be improved

The above technical problems have not been well resolved

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