Thermoplastic precise forming nitrogen protection oxidation preventing system

Abstract

The invention belongs to the field of modern precision hot-working technique, and relates to a system that uses Nitrogen to prevent oxidation during the thermoplasticity fine forming process. The system mainly includes following system: the bar stock cleaning system, system using sealed dynamic Nitrogen to heat, cooling and non-oxidation device, mesotherm cooling system and controlling system. Blast sand and baiting, dewatered bar stock first are heated in heated Nitrogen chamber before being pre-formed. After being pre-formed, the above work pieces are heated in Nitrogen chamber again, then are formed more finely. After above process, the workpieces are cooled first in Nitrogen chamber that for protecting cooling path. When the temperature becomes mesotherm, they are sent into the mesotherm cooling chamber to be cooled once more. Finally, the workpieces are sent out by the material carrying machine. The invention not only can eliminate wasting material due to oxidation in high temperature, also improve the workpiece size precision and surface quality, prolong the mould's service life.

Description

Technical field: [0001] The invention belongs to the field of precision thermal processing of modern advanced manufacturing technology, and specifically relates to a nitrogen protection and anti-oxidation device for the production process of thermoplastic fine forming. technical background: [0002] Thermoplastic precision forming plays an important role in modern manufacturing technology. For ferrous metals at high temperature, the initial forging temperature is about 1200 ° C, and the final forging temperature is about 800 ° C. Oxidation produces a large amount of scale, which not only wastes raw materials and pollutes the environment , and seriously affect the dimensional accuracy, surface quality and service life of the mold. In order to prevent high-temperature oxidation, glass coatings are often used for protection at home and abroad. However, the glass coating may solidify and be pressed into the surface of the workpiece. The chemical reaction of the base metal will a...

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Problems solved by technology

[0002] Thermoplastic precision forming plays an important role in modern manufacturing technology. For ferrous metals at high temperature, the initial forging temperature is about 1200 ° C, and the final forging temperature is about 800 ° C. Oxidation produces a large amount of scale, which not only wastes raw materials and pollutes the environment , and seriously affect the dimensional accuracy, surface quality and service life of the mold. In order to prevent high-temperature oxidation, glass coatings are often used for protection at home and abroad. However, the glass coating may solidify and be pressed into the surface of the workpiece. The chemical reaction of the base metal will affect the surface quality of the workpiece, and the coating and removal of the coating are labor-intensive, so it is imperative to prevent or reduce the installation and facilities of high-temperature oxidation

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