A method for cross rolling piercing of pure titanium seamless pipe

Abstract

The invention discloses a pure titanium seamless pipe cross rolling piercing method which includes the steps: hot spraying a zirconium oxide coating with the thickness of 0.2-0.4mm on a working surface of a guide plate of a cross rolling piercing machine by the aid of plasma; grinding the zirconium oxide coating with surface roughness of 0.9-1.5 micrometers; smearing boron nitride lubricants on a working surface of a front guide plate of the cross rolling piercing machine; setting the ellipticity of a pure titanium seamless pipe cross rolling piercing hole pattern to be 1.09-1.2. By the method, piercing and sizing can be performed on a hot rolling mill comprising the cross rolling piercing machine, so that a high-precision pure titanium seamless pipe is directly produced on a production process line, and the problems of easiness in adhesion and low yield of guide plates of a cross rolling piercing machine in the prior art are solved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a cross-rolling piercing method for a pure titanium seamless pipe. Background technique [0002] The production of pure titanium seamless pipe generally adopts cold rolling or cold drawing process after extrusion of round tube billet. However, extrusion has problems such as high cost and low yield. If the cross-rolling piercing machine is used instead of extrusion, the production cost will be greatly reduced. Specifically, the cross-rolling piercer consists of two barrel-shaped rolls arranged left and right, and two guide plates arranged vertically up and down to form a fully enclosed pass. The specific structure and working method of the cross-rolling piercer is the prior art, and will not be repeated here. . But because there is a very thin oxide film on the surface of pure titanium, this oxide film will be destroyed during the plastic deformation process, and...

AI Technical Summary

Problems solved by technology

But because there is a very thin oxide film on the surface of pure titanium, this oxide film will be destroyed during the plastic deformation process, and the exposed new pure titanium is easy to stick to the mold to produce abrasive particles, which affects the forming process and product quality

Pure titanium has the characteristics of easy adhesion, 1.5 times the width of carbon steel, and poor high-temperature plasticity. When using a cross-rolling piercer to perforate a pure titanium seamless pipe, the two guide plates of the cross-rolling piercer are very easy to stick, and the guide plate Adhesive scarring will scratch the surface of the titanium tube, resulting in the scrapping of the titanium tube