Glass lubricant for hot extrusion of titanium alloy section bar

Abstract

The invention provides a glass lubricant combination for hot extrusion of a titanium alloy section bar at a temperature of 900 DEG C-1,200 DEG C. The lubricant is composed of glasses being powder-coated glass and glass-pad glass with novel glass formulas. The two types of glass are used in a roller coating stage and an extruding stage respectively. Compared with conventional products, the lubricant provided by the invention has better protective and lubricative performances. With the products provided by the invention, surface roughness of the titanium alloy section bar is low; defects are few; and coping rate can be significantly reduced.

Description

technical field [0001] The invention relates to a novel glass lubricant, in particular to a glass lubricant for hot extrusion of titanium alloy profiles at 900°C to 1200°C. Background technique [0002] Titanium alloy profile is an important near-net-shape semi-finished product. It can be directly used as a part with only a small amount of machining or no machining. It has high structural efficiency and is currently widely used in aviation, medical and other fields. The more varieties and specifications of profiles, the shorter the development cycle of equipment. The research on the preparation and processing technology of titanium alloy profiles at home and abroad has continued for many years. The preparation and processing methods of titanium alloy profiles mainly include rolling method, hot extrusion method, machining method, plate bending forming method, etc. Among them, the hot extrusion method is a processing technology that cannot be replaced by other methods. Compar...

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Problems solved by technology

However, the existing glass lubricants are not originally developed for the extrusion of titanium alloy profiles, and it is difficult to match the extrusion process of titanium alloy profiles. Excessive heat absorption will lead to a large temperature difference between the surface of the billet and the interior, which will easily cause metal turbulence during extrusion; the viscosity of the glass used for the glass pad is too high, and it cannot be melted quickly when it contacts the billet to be extruded, which will easily lead to hard glass particles. As the metal enters the mold cavity and embeds on the metal surface, craters and serious scratches are formed. The above two aspects lead to serious surface defects and cracking of titanium alloy profiles produced by using the existing glass lubricant combination, and the surface roughness Rz is much greater than 80 μm. The finished product low rate

The problem of surface quality has seriously restricted the development and production of titanium alloy profiles. Therefore, it is necessary to provide a combination of glass lubricants specially used for hot extrusion of titanium alloy profiles.

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