阅读说明：本技术 一种薄壁高精度钛合金无缝方矩形管及其制造方法和应用 (Thin-wall high-precision titanium alloy seamless square and rectangular pipe and manufacturing method and application thereof ) 是由 贺峰 曹继敏 王戈 樊亚军 石金虎 于 2019-10-30 设计创作，主要内容包括：本发明属于钛合金管材技术领域,公开了一种薄壁高精度钛合金无缝方矩型管及其制备方法和应用。管体的内壁和外壁的横截面均为方形或矩形；外壁R角和内壁r角均为壁厚的1～1.5倍。以无缝钛合金薄壁圆管为坯料；用感应加热对圆管进行加热,采用模具拉拔的方法制备方矩型管,可对产品的R角进行调节；根据产品的强度需求选择合适的热处理工艺,校直切断,表面进行抛光处理。本发明的高精度薄壁钛合金无缝方矩管采用感应加热和模具拉拔的制备方法,有效解决了薄壁高精度钛合金方矩形管难加工、表面易开裂的问题及连续的感应加热可以生产长度可控的无缝方矩型管。(The invention belongs to the technical field of titanium alloy pipes, and discloses a thin-wall high-precision titanium alloy seamless square-rectangular pipe and a preparation method and application thereof. The cross sections of the inner wall and the outer wall of the pipe body are square or rectangular; the outer wall R angle and the inner wall R angle are 1-1.5 times of the wall thickness. Taking a seamless titanium alloy thin-wall round tube as a blank; the round tube is heated by induction heating, and the square and rectangular tube is prepared by adopting a die drawing method, so that the R angle of the product can be adjusted; and selecting a proper heat treatment process according to the strength requirement of the product, straightening and cutting, and polishing the surface. The high-precision thin-wall titanium alloy seamless square and rectangular tube is prepared by adopting the induction heating and die drawing method, so that the problems that the thin-wall high-precision titanium alloy square and rectangular tube is difficult to process and the surface is easy to crack are effectively solved, and the seamless square and rectangular tube with controllable length can be produced by continuous induction heating.)

1. The thin-wall high-precision titanium alloy seamless square rectangular tube is characterized in that the thin-wall high-precision titanium alloy seamless square rectangular tube is provided with: a pipe body;

integrally forming a pipe body;

the cross sections of the outer wall and the inner wall of the pipe body are square or rectangular; the R angle of the outer wall and the R angle of the inner wall are 1-1.5 times of the wall thickness.

2. The thin-walled high-precision titanium alloy seamless square rectangular tube according to claim 1, wherein the cross section of the tube body is square or rectangular.

3. The method for manufacturing a thin-walled high-precision titanium alloy seamless square rectangular pipe according to claim 1, wherein the method for manufacturing a thin-walled high-precision titanium alloy seamless square rectangular pipe comprises:

firstly, selecting a proper thin-wall seamless circular tube as a blank through conversion according to the size and the wall thickness specification of a square rectangular tube;

secondly, a heading machine is adopted to perform heading treatment on the pipe head of the circular pipe;

thirdly, lubricating the inner surface and the outer surface of the round pipe;

fourthly, heating the titanium alloy seamless circular tube by adopting induction heating, and deforming in a α + β two-phase region below a phase change point;

fifthly, continuously drawing the heated alloy circular tube by multiple modes according to a deformation mode from a circle to an ellipse and then from the ellipse to a square to manufacture a thin-wall high-precision titanium alloy seamless square rectangular tube;

sixthly, selecting a proper heat treatment system to carry out annealing treatment according to the strength requirement of the square and rectangular tube;

seventhly, straightening, fixing the length and cutting by adopting profile straightening equipment;

and eighthly, performing surface polishing treatment by adopting a square tube polishing machine.

4. The method of manufacturing a thin-walled high-precision titanium alloy seamless square rectangular tube according to claim 3, wherein the second step heats the alloy seamless circular tube to 500 to 700 ℃.

5. The method for manufacturing a thin-walled high-precision titanium alloy seamless square rectangular tube according to claim 3, wherein the fourth step is a heat treatment performed at a temperature of 700 to 800 ℃ in accordance with the strength requirement of the square rectangular tube.

6. The application of the thin-wall high-precision titanium alloy seamless square rectangular pipe as claimed in any one of claims 1-2 in aircraft manufacturing.

7. The application of the thin-wall high-precision titanium alloy seamless square rectangular pipe as claimed in any one of claims 1-2 in automobile manufacturing.

8. The application of the thin-wall high-precision titanium alloy seamless square rectangular pipe as claimed in any one of claims 1-2 in ship manufacturing.

9. The thin-wall high-precision titanium alloy seamless square rectangular pipe as claimed in any one of claims 1 to 2, and the application thereof in petrochemical industry.

10. The application of the thin-wall high-precision titanium alloy seamless square rectangular pipe as claimed in any one of claims 1-2 in nuclear power industry.

Technical Field

The invention belongs to the technical field of titanium alloy pipes, and particularly relates to a thin-wall high-precision titanium alloy seamless square rectangular pipe and a manufacturing method and application thereof.

Background

Because the titanium alloy has the advantages of higher strength ratio, excellent corrosion resistance, no magnetism and the like, a pipeline system and a pressure vessel prepared from the titanium alloy are widely applied to the fields of aviation, aerospace, ships, nuclear industry, petroleum, chemical industry and the like. The thin-wall high-precision titanium alloy seamless square rectangular pipe is a special-shaped pipe which has extremely wide application and is the most common, and is also an economic section pipe. The titanium alloy is in a close-packed hexagonal structure at room temperature, less in deformable sliding system, high in deformation difficulty and difficult to form at one time through large deformation. The existing process for producing the thin-wall titanium alloy seamless square and rectangular tube mainly comprises extrusion forming and special-shaped rolling forming, and the two production modes have great problems on the production of the thin-wall high-precision seamless square and rectangular tube, such as poor dimensional precision, limited length of a finished tube and easy generation of cracks on the surface.

In summary, the problems of the prior art are as follows: the existing process for producing the thin-wall titanium alloy seamless square tube has the defects of poor dimensional precision, limited length of a finished tube and easy generation of cracks on the surface.

Disclosure of Invention

In order to solve the problems, the invention provides a thin-wall high-precision titanium alloy seamless square rectangular tube and a manufacturing method and application thereof.

The invention is realized in this way, the thin-wall high-precision titanium alloy seamless square rectangular tube is provided with: a pipe body;

integrally forming a pipe body;

the cross sections of the outer wall and the inner wall of the pipe body are square or rectangular; the R angle of the outer wall and the R angle of the inner wall are 1-1.5 times of the wall thickness.

Further, the cross section of the pipe body is square or rectangular.

Another object of the present invention is to provide a method for manufacturing the thin-walled high-precision titanium alloy seamless square rectangular tube, which includes:

firstly, selecting a proper thin-wall seamless circular tube as a blank through conversion according to the size and the wall thickness specification of a square rectangular tube;

secondly, a heading machine is adopted to perform heading treatment on the pipe head of the circular pipe;

thirdly, lubricating the inner surface and the outer surface of the round pipe;

fourthly, heating the titanium alloy seamless circular tube by adopting induction heating, and deforming in a α + β two-phase region below a phase change point;

fifthly, continuously drawing the heated alloy circular tube through a multi-die according to a deformation mode from a circle to an ellipse and then from the ellipse to a square to manufacture a thin-wall titanium alloy seamless square rectangular tube;

sixthly, selecting a proper heat treatment system to carry out annealing treatment according to the strength requirement of the square and rectangular tube;

seventhly, straightening, fixing the length and cutting by adopting profile straightening equipment;

and eighthly, polishing by using a square tube polishing machine.

Further, the third step uses graphite milk as a lubricant.

Further, the fourth step is to heat the titanium alloy seamless round tube to 500-700 ℃.

Further, the drawing from the round pipe to the square pipe in the fifth step adopts a drawing mode with a core rod, and the drawing times are 5.

Further, the sixth step is to select 700-800 ℃ for heat treatment according to the specification size and thickness of the square rectangular tube.

The invention also aims to provide application of the thin-walled high-precision titanium alloy seamless square rectangular pipe in aircraft manufacturing.

The invention also aims to provide application of the thin-wall high-precision titanium alloy seamless square rectangular pipe in automobile manufacturing.

The invention also aims to provide application of the thin-walled high-precision titanium alloy seamless square rectangular pipe in ship manufacturing.

The invention also aims to provide application of the thin-wall high-precision titanium alloy seamless square rectangular pipe in petrochemical industry.

The invention also aims to provide application of the thin-wall high-precision titanium alloy seamless square rectangular pipe in the nuclear power industry.

In conclusion, the thin-wall high-precision titanium alloy seamless square rectangular tube is manufactured by drawing and forming a seamless titanium alloy circular tube, then carrying out heat treatment and subsequent straightening and polishing. Compared with the prior production process, the method has the advantages and positive effects as follows:

1) the drawing mode with the core rod is adopted, the size precision of the finished square rectangular tube can be greatly improved, and the outer R angle and the inner R angle can be strictly controlled according to the die.

2) By adopting continuous induction heating, the heat loss of the round tube in the drawing process can be reduced, the generation of cracks on the surface is reduced, meanwhile, the length of the finished square and rectangular tube can be increased, the number of times of heading is reduced, and the yield is increased.

3) The technical scheme of the invention can produce the thin-wall high-precision titanium alloy seamless square rectangular pipe with high dimensional precision, excellent comprehensive mechanical property and good surface roughness.

Drawings

FIG. 1 is a schematic structural diagram of a titanium alloy seamless square rectangular tube according to an embodiment of the present invention;

in the figure: 1. a pipe body; 2. an inner wall; 3. an outer wall; 4. an outer R angle; 5. the inner r angle.

FIG. 2 is a cross-sectional view of a titanium alloy seamless square rectangular tube according to an embodiment of the present invention.

FIG. 3 is a flow chart of a method for manufacturing a titanium alloy seamless square rectangular tube according to an embodiment of the present invention.

FIG. 4 is a diagram illustrating an actual effect of the titanium alloy seamless square rectangular tube according to the embodiment of the present invention.

FIG. 5 is a crystal phase diagram of a seamless square rectangular tube of titanium alloy according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Aiming at the problems in the prior art, the invention provides a titanium alloy seamless square rectangular pipe and a manufacturing method and application thereof, and the invention is described in detail below with reference to the accompanying drawings.

As shown in fig. 1, the TC4 titanium alloy seamless square tube provided by the embodiment of the present invention includes: the pipe comprises a pipe body 1, an inner wall 2, an outer wall 3, an outer R angle 4 and an inner R angle 5.

The pipe body 1 is integrally formed, and the cross section of the pipe body 1 is square. The cross sections of the outer wall 2 and the inner wall 3 of the tube body 1 are square. The outer wall R angle 4 and the inner wall R angle 5 are controlled to be 1-1.5 times of the wall thickness.

As shown in fig. 3, the method for manufacturing the seamless square tube made of the TC4 titanium alloy 30 × 30mm, the wall thickness of 2mm, the R angle of 2.4mm, and the R angle of 2mm according to the embodiment of the present invention includes the following steps:

s301: selecting a titanium alloy seamless circular tube with phi of 37.5 multiplied by 3mm as a blank through calculation according to the required dimension and the wall thickness of the square tube with 30 multiplied by 30 mm;

s302: adopting a heading machine to perform heading treatment on the pipe head of the circular pipe;

s303: the inner surface and the outer surface of the round pipe are dipped with the graphite emulsion;

s304, adopting induction heating to quickly heat the titanium alloy seamless circular tube to 700 ℃, and deforming in a α + β two-phase region below a phase change point;

s305: continuously drawing the heated alloy circular tube by multiple times according to a deformation mode from a circle to an ellipse and then from the ellipse to a square to prepare a thin-wall TC4 titanium alloy seamless square rectangular tube;

s306: selecting 700 ℃ for heat treatment according to the strength requirement of the square pipe;

s307: straightening, sizing and cutting by adopting special-shaped straightening equipment;

s308: and (4) performing surface polishing treatment by adopting a square and rectangular tube polishing machine.

The picture of the titanium alloy seamless square rectangular tube of the embodiment of the invention is shown in figure 4.

The crystal phase photo of the titanium alloy seamless square rectangular tube of the embodiment of the invention is shown in FIG. 5.

The mechanical properties of the titanium alloy seamless square rectangular tube of the embodiment of the invention are shown in table 1.

TABLE 1 mechanical Properties of titanium alloy seamless Square rectangular tube

Mechanical properties at room temperature	Rm/MPa	Rp0.2/MPa	A/％	Z/％
					Example TC4 Square tube	1050	900	13	40

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.