CN101837386A - Method for manufacturing titanium alloy thick-wall pipe - Google Patents

Abstract

The invention discloses a method for manufacturing a titanium alloy thick-wall pipe, which is suitable for thermal stretching manufacture of a Ti-6Al-4V titanium alloy thick-wall pipe. The method is characterized by comprising the following steps: (1) preparing a blank; (2) heating the pipe blank; (3) thermally stretching the pipe blank; (4) thermally scalping the pipe blank; (5) thermally straightening the pipe blank; (6) polishing a surface oxidation film; (7) fixing the size and blanking the pipe blank; and (8) polishing the pipe blank to obtain a qualified product. The method for producing the Ti-6Al-4V titanium alloy thick-wall pipe by adopting a new thermal stretching process overcomes the defect of the traditional drilling method, and has the characteristics of quick efficiency, good material, high yield and the like.

Description

A kind of manufacture method of titanium alloy thick-wall pipe

Technical field

The present invention relates to a kind of manufacture method of titanium alloy thick-wall pipe, particularly relate to a kind of hot-stretch manufacture method of Ti-6Al-4V titanium alloy thick-wall pipe, belong to the processing and fabricating technology of titanium alloy thick-wall pipe.

Background technology

The Ti-6Al-4V titanium alloy is widely used in fields such as aviation, navigation, medicine equipment, bioimplant owing to have excellent properties such as intensity height, corrosion-resistant, good biocompatibility.Its consumption accounts for 50% of titanium material use quantity.A great deal of need are wherein arranged with the tubing supply.But because the resistance of deformation of this alloy is big, be difficult to produce tubing with common cold deformation method, external diameter can only be used the machining process production of boring less than 15 millimeters tubing.Characteristics such as its process velocity is slow, accuracy is poor, lumber recovery is low make this class tubing price very expensive.

Summary of the invention

The objective of the invention is to solve the problems referred to above that prior art exists, by research improvement repeatedly, provided a kind of manufacture method of new titanium alloy thick-wall pipe, the manufacture method of this titanium alloy thick-wall pipe adopts new heat stretching process to produce the Ti-6Al-4V titanium alloy thick-wall pipe, overcome the shortcoming of conventional borehole method, had the advantages that efficient is fast, quality good, lumber recovery is high.

The technical scheme that the present invention provides is: the manufacture method of this titanium alloy thick-wall pipe, and its characteristics include following steps:

(1) blank is prepared: the pipe after will boring a hole is removed surface scale and blemish with the method for machinery or sandblast;

(2) heating of pipe blank: be heated to 300-800 ℃ with tubular electric resistance heating furnace or heating in medium frequency stove;

(3) hot-stretch: use hard metal stretching die, top heating on double-chain stretching-machine, stretch while lubricating, the pipe diameter is reduced, length increases, stretch through multi-pass, make pipe be stretched to required size, wherein draft temperature 300-800 ℃, draw speed 1-10 rice/minute, pass reduction 5-20%, lubricant are graphite powder;

(4) heat strips off the skin: the pipe that stretching is finished is heated to required temperature in advance, the carbide alloy slicing mould that Yuhuan shape bite is arranged with mill, on double-chain stretching-machine, carry out the slowness drawing, longitudinally prune pipe surface scale and defective, wherein drawing temperature 300-800 ℃, drawing speed 1-10 rice/minute, passage sizing reduction 0.1-0.4 millimeter;

(5) thermal straightening: the pipe two ends after will stripping off the skin are fixed on the stress straightening machine, pass to electric current and make its heating, and the limit heating edge stretches, till stretching, and wherein heating-up temperature 300-800 ℃, tubing percentage elongation 1-5%;

(6) centreless grinding: the tubing after will aligning grinds off surface film oxide on centerless grinder, and makes its external diameter reach tolerance;

(7) scale blanking: the length by customer requirement is cut off blanking;

(8) polishing: by the client requirement of roughness is polished on polishing machine the tubing surfaces externally and internally, obtain size and all qualified product of inside and outside quality.

Mentioned equipment is the existing equipment that can purchase on the market in technique scheme, and for example, the manufacturer of carbide alloy slicing mould is Zhuzhou Hard Alloy Group Co Ltd's (diamond plate, material: alloy Y G8; Model: adopt the respective series product) according to different size; The manufacturer of centerless grinder is WuXi Machine Tools Co., Ltd's (model: MT1040A); And the manufacturer of equipment such as tubular electric resistance heating furnace or heating in medium frequency stove, double-chain stretching-machine, stress straightening machine is more, and selecting suitable device according to technological requirement then is industry technical staff's required technical knowledge and skills.

Compared with prior art, the invention has the beneficial effects as follows: adopt new heat stretching process to produce the Ti-6Al-4V titanium alloy thick-wall pipe, overcome the shortcoming of conventional borehole method, have the advantages that efficient is fast, quality good, lumber recovery is high.

The specific embodiment

Pipe after at first will boring a hole is removed surface scale and blemish with the method for machinery or sandblast; Be heated to 300-800 ℃ with tubular electric resistance heating furnace or heating in medium frequency stove again; Use hard metal stretching die then, in the heating of double-chain stretching-machine top, stretch while lubricating, the pipe diameter is reduced, length increases.Stretch through multi-pass, make pipe be stretched to required size; The pipe that stretching is finished is heated to required temperature in advance again, has the carbide alloy slicing mould of Yuhuan shape bite to carry out the slowness drawing on double-chain stretching-machine, longitudinally prune pipe surface scale and defective with mill; Pipe two ends after will stripping off the skin again are fixed on the stress straightening machine, pass to electric current and make its heating, and the limit heating edge stretches, till stretching; Tubing behind the aligning is ground off surface film oxide on centerless grinder, and make its external diameter reach tolerance; Length by customer requirement is cut off blanking; By the client requirement of roughness is polished on polishing machine the tubing surfaces externally and internally, obtain size and all qualified product of inside and outside quality at last.

Main technologic parameters in the above-mentioned technological process is as follows:

(1) pipe hot-stretch: draft temperature 300-800 ℃, draw speed 1-10 rice/minute, pass reduction 5-20%, lubricant are graphite powder;

(2) heat strips off the skin: 300-800 ℃ of drawing temperature, and drawing speed 1-10 rice/minute, passage sizing reduction 0.1-0.4 millimeter;

(3) thermal straightening: heating-up temperature 300-800 ℃, tubing percentage elongation 1-5%.

Claims (1)

1. the manufacture method of a titanium alloy thick-wall pipe is characterized in that including following steps:

(1) blank is prepared: the pipe after will boring a hole is removed surface scale and blemish with the method for machinery or sandblast;

(2) heating of pipe blank: be heated to 300-800 ℃ with tubular electric resistance heating furnace or heating in medium frequency stove;

(3) hot-stretch: use hard metal stretching die, top heating on double-chain stretching-machine, stretch while lubricating, the pipe diameter is reduced, length increases, stretch through multi-pass, make pipe be stretched to required size, wherein draft temperature 300-800 ℃, draw speed 1-10 rice/minute, pass reduction 5-20%, lubricant are graphite powder;

(4) heat strips off the skin: the pipe that stretching is finished is heated to required temperature in advance, the carbide alloy slicing mould that Yuhuan shape bite is arranged with mill, on double-chain stretching-machine, carry out the slowness drawing, longitudinally prune pipe surface scale and defective, wherein drawing temperature 300-800 ℃, drawing speed 1-10 rice/minute, passage sizing reduction 0.1-0.4 millimeter;

(5) thermal straightening: the pipe two ends after will stripping off the skin are fixed on the stress straightening machine, pass to electric current and make its heating, and the limit heating edge stretches, till stretching, and wherein heating-up temperature 300-800 ℃, tubing percentage elongation 1-5%;

(6) centreless grinding: the tubing after will aligning grinds off surface film oxide on centerless grinder, and makes its external diameter reach tolerance;

(7) scale blanking: the length by customer requirement is cut off blanking;

(8) polishing: by the client requirement of roughness is polished on polishing machine the tubing surfaces externally and internally, obtain size and all qualified product of inside and outside quality.