CN114260314B - Manufacturing method of titanium alloy seamless tube blank with diameter-thickness ratio larger than 20 - Google Patents
Manufacturing method of titanium alloy seamless tube blank with diameter-thickness ratio larger than 20 Download PDFInfo
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- CN114260314B CN114260314B CN202111570078.3A CN202111570078A CN114260314B CN 114260314 B CN114260314 B CN 114260314B CN 202111570078 A CN202111570078 A CN 202111570078A CN 114260314 B CN114260314 B CN 114260314B
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Abstract
The invention discloses a method for manufacturing a titanium alloy seamless tube blank with the diameter-thickness ratio larger than 20, which comprises the following steps: selecting titanium sponge and alloy bags as raw materials, and performing secondary vacuum smelting to obtain cast ingots; forging the step ingot into square billets, sequentially carrying out blanking, surface grinding treatment, three upsetting and three drawing, then placing into an electric furnace for heating, preserving heat for 2-8 hours, and carrying out primary perforation, secondary perforation and tertiary perforation by using a three-roller oblique rolling perforating machine to manufacture a titanium alloy tube blank; and (3) conveying the titanium alloy tube blank into a sizing and reducing machine for sizing and reducing, then carrying out internal and external surface treatment and annealing treatment, straightening, deburring and polishing the finished tube after the annealing treatment, and then machining and cutting two ends of the tube blank to obtain the specified length size. The titanium alloy seamless tube blank with the diameter-thickness ratio larger than 20 has the advantages of good inner and outer surface quality and excellent mechanical property, reduces subsequent drawing passes and rolling passes, and improves production efficiency.
Description
Technical Field
The invention relates to the field of pipe fitting manufacturing, in particular to a manufacturing method of a titanium alloy seamless pipe blank with a diameter-thickness ratio larger than 20.
Background
The seamless steel pipe is made of a whole metal, has no seam on the surface, is called a seamless steel pipe, is divided into a hot rolled pipe, a cold drawn pipe, an extruded pipe, a jacking pipe and the like according to the production method, is divided into a round shape and a special shape according to the cross section shape, is provided with various complex shapes such as square, elliptic, triangular, hexagonal, melon seed shape, star shape and finned pipe, has the maximum diameter of 650mm and the minimum diameter of 0.3mm, and is provided with a thick-wall pipe and a thin-wall pipe according to the different purposes, and is mainly used as a petroleum geological drilling pipe, a cracking pipe for petrochemical industry, a boiler pipe, a bearing pipe and a high-precision structural steel pipe for automobiles, tractors and aviation. The conventional domestic perforation equipment is perforated once, and the diameter-thickness ratio is generally between 10 and 15. The wall thickness of the perforated tube blank causes difficulties for subsequent cold rolling of high-precision seamless titanium alloy tubes, the processing passes are multiple, the production period is long, the market needs are not met, and the production cost is high.
Disclosure of Invention
The invention aims to provide a manufacturing method of a titanium alloy seamless tube blank with the diameter-thickness ratio larger than 20, wherein the wall thickness of the titanium alloy tube blank after perforation is thin, a finished product can be obtained by only one cold rolling pass, the production period is short, and the production cost is reduced.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a manufacturing method of a titanium alloy seamless tube blank with the diameter-thickness ratio larger than 20 comprises the following steps:
(1) Selecting high-quality titanium sponge and alloy bags as raw materials, proportioning the titanium sponge and the alloy bags according to requirements, and carrying out secondary vacuum smelting to obtain cast ingots;
(2) Forging the cast ingot in the step (1) into square billets, sequentially blanking and surface grinding, and finally forging into titanium alloy bars with phi 114-620 mm through three upsets and three drawing;
(3) Heating the titanium alloy bar material prepared in the step (2) in an electric furnace at 880-1150 ℃ for 2-8 hours, and performing primary perforation, secondary perforation and tertiary perforation by using a three-roller oblique rolling perforating machine to prepare a titanium alloy tube blank;
(4) Feeding the titanium alloy tube blank in the step (3) into a sizing and reducing machine for sizing and reducing to obtain a titanium alloy tube blank;
(5) And (3) carrying out internal and external surface treatment on the titanium alloy tube blank prepared in the step (4), carrying out annealing treatment, straightening, deburring and polishing on the finished tube material subjected to annealing treatment, and carrying out machining and cutting on two ends of the tube blank to obtain a specified length size, thereby obtaining the titanium alloy seamless tube blank with the diameter-thickness ratio larger than 20.
Preferably, the three-roll oblique rolling perforation process method in the step (3) is as follows:
a) An electric furnace is adopted to heat the titanium alloy bar, and the heating temperature of the electric furnace is controlled by an optical temperature measuring instrument, so that the titanium alloy bar is uniformly heated;
b) The center line of a pushing cylinder of the three-roller oblique rolling perforating machine, the center line of rolling and the center line of a thrust bearing in the ejector rod trolley are adjusted to be on the same straight line;
c) The plug with the specification and the size meeting the requirements is selected, the material of the plug is 20CrNi4, the plug extends out of the roller compression belt for 40-80mm, the cooling water pressure of the plug is controlled to be 0.3-0.8Mpa, and the rolling speed is 0.30-0.55m/s.
Preferably, in the perforation process in the step (3), the compression ratio of the primary perforation is 14% -16%, the compression ratio of the secondary perforation is 8% -10%, and the compression ratio of the tertiary perforation is 8% -10%.
Preferably, in the step (3), the primary perforation heating temperature of the titanium alloy bar in the electric furnace is 930-1150 ℃; the heating temperature of the secondary and the tertiary perforation is 880-1080 ℃.
Preferably, in the step (1), the alloy package is nickel-molybdenum alloy, and the mass ratio of Ti, ni, mo is 1:0.008:0.003.
Preferably, in the step (1), the alloy package is an aluminum-vanadium alloy, and the mass ratio of Ti, al and V is 1:0.06:0.04.
Compared with the prior art, the invention has the beneficial effects that:
the tube blank perforation process mainly comprises three times of perforation in three-roller perforation equipment, wherein the tube blank is perforated until the diameter-thickness ratio is more than 20. The wall thickness of the perforated titanium alloy tube blank is thin, the finished product can be obtained by only cold rolling for one pass, the production period is short, and the production cost is reduced. And secondly, the titanium alloy seamless tube blank with the diameter-thickness ratio larger than 20 has the advantages of good inner and outer surface quality and excellent mechanical property, reduces subsequent drawing passes and rolling passes, and improves the production efficiency.
Detailed Description
The following description of the technical solutions in the embodiments of the present invention will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
A manufacturing method of a titanium alloy seamless tube blank with the diameter-thickness ratio larger than 20 comprises the following steps:
(1) Selecting high-quality sponge titanium and alloy bags as raw materials, proportioning the sponge titanium and alloy bags according to requirements, and carrying out secondary vacuum smelting to obtain cast ingots, wherein when the alloy bags are nickel-molybdenum alloy, the mass ratio of Ti, ni and Mo is 1:0.008:0.003; when the alloy package is aluminum-vanadium alloy, the mass ratio of Ti, al and V is 1:0.06:0.04;
(2) Forging the cast ingot in the step (1) into square billets, sequentially blanking and surface grinding, and finally forging into titanium alloy bars with phi 114-620 mm through three upsets and three drawing;
(3) Heating the titanium alloy bar material prepared in the step (2) in an electric furnace at the temperature of 880-1150 ℃ for 2-8 hours, and performing primary perforation, secondary perforation and tertiary perforation by using a three-roller oblique rolling perforation machine to prepare a titanium alloy tube blank, wherein the primary perforation compression ratio is 14-16%, the secondary perforation compression ratio is 8-10%, the tertiary perforation compression ratio is 8-10%, the primary perforation heating temperature of the titanium alloy bar material in the electric furnace is 930-1150 ℃, and the secondary perforation heating temperature of the tertiary perforation is 880-1080 ℃;
(4) Feeding the titanium alloy tube blank in the step (3) into a sizing and reducing machine for sizing and reducing to obtain a titanium alloy tube blank;
(5) And (3) carrying out internal and external surface treatment on the titanium alloy tube blank prepared in the step (4), carrying out annealing treatment, straightening, deburring and polishing on the finished tube material subjected to annealing treatment, and carrying out machining and cutting on two ends of the tube blank to obtain a specified length size, thereby obtaining the titanium alloy seamless tube blank with the diameter-thickness ratio larger than 20.
The three-roller oblique rolling perforation process method in the step (3) comprises the following steps:
a) An electric furnace is adopted to heat the titanium alloy bar, and the heating temperature of the electric furnace is controlled by an optical temperature measuring instrument, so that the titanium alloy bar is uniformly heated;
b) The center line of a pushing cylinder of the three-roller oblique rolling perforating machine, the center line of rolling and the center line of a thrust bearing in the ejector rod trolley are adjusted to be on the same straight line;
c) The plug with the specification and the size meeting the requirements is selected, the material of the plug is 20CrNi4, the plug extends out of the roller compression belt for 40-80mm, the cooling water pressure of the plug is controlled to be 0.3-0.8Mpa, and the rolling speed is 0.30-0.55m/s.
The foregoing is merely illustrative and explanatory of the invention, as it is well within the scope of the invention, as it is intended to provide those skilled in the art with various modifications, additions and substitutions to the specific embodiments disclosed and those skilled in the art without departing from the scope of the invention as disclosed in the accompanying claims.
Claims (3)
1. The manufacturing method of the titanium alloy seamless tube blank with the diameter-thickness ratio larger than 20 is characterized by comprising the following steps:
(1) Selecting high-quality sponge titanium and alloy bags as raw materials, proportioning the sponge titanium and the alloy bags, and performing secondary vacuum smelting to obtain cast ingots, wherein the alloy bags are nickel-molybdenum alloy or aluminum-vanadium alloy;
(2) Forging the cast ingot in the step (1) into square billets, sequentially blanking and surface grinding, and finally forging into titanium alloy bars with phi 114-620 mm through three upsets and three drawing;
(3) Heating the titanium alloy bar material prepared in the step (2) in an electric furnace at 880-1150 ℃ for 2-8 hours, and performing primary perforation, secondary perforation and tertiary perforation by using a three-roller oblique rolling perforating machine to prepare a titanium alloy tube blank, wherein the primary perforation compression ratio is 14-16%, the secondary perforation compression ratio is 8-10%, the tertiary perforation compression ratio is 8-10%, and the primary perforation heating temperature of the titanium alloy bar material in the electric furnace is 930-1150 ℃; the heating temperature of the secondary and the tertiary perforation is 880-1080 ℃;
(4) Feeding the titanium alloy tube blank in the step (3) into a sizing and reducing machine for sizing and reducing to obtain a titanium alloy tube blank;
(5) Carrying out internal and external surface treatment and annealing treatment on the titanium alloy tube blank prepared in the step (4), straightening, deburring and polishing the finished tube blank subjected to annealing treatment, and machining and cutting two ends of the tube blank to obtain a specified length size, thus obtaining the titanium alloy seamless tube blank with the diameter-thickness ratio larger than 20;
the three-roller oblique rolling perforation process method in the step (3) comprises the following steps:
a) An electric furnace is adopted to heat the titanium alloy bar, and the heating temperature of the electric furnace is controlled by an optical temperature measuring instrument, so that the titanium alloy bar is uniformly heated;
b) The center line of a pushing cylinder of the three-roller oblique rolling perforating machine, the center line of rolling and the center line of a thrust bearing in the ejector rod trolley are adjusted to be on the same straight line;
c) The plug with the specification and the size meeting the requirements is selected, the material of the plug is 20CrNi4, the plug extends out of the roller compression belt for 40-80mm, the cooling water pressure of the plug is controlled to be 0.3-0.8Mpa, and the rolling speed is 0.30-0.55m/s.
2. The method for producing a titanium alloy seamless tube blank having a diameter-thickness ratio of more than 20 according to claim 1, wherein: in the step (1), when the alloy package is nickel-molybdenum alloy, the mass ratio of Ti, ni and Mo is 1:0.008:0.003.
3. The method for producing a titanium alloy seamless tube blank having a diameter-thickness ratio of more than 20 according to claim 1, wherein: in the step (1), when the alloy package is an aluminum-vanadium alloy, the mass ratio of Ti, al and V is 1:0.06:0.04.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4991419A (en) * | 1988-11-18 | 1991-02-12 | Sumitomo Metal Industries, Ltd. | Method of manufacturing seamless tube formed of titanium material |
| CN106493187A (en) * | 2016-10-27 | 2017-03-15 | 南京宝泰特种材料股份有限公司 | A kind of heavy caliber thick wall titanium and its low-cost manufacture method of alloy seamless tubing |
| CN107052076A (en) * | 2016-11-28 | 2017-08-18 | 安徽宝泰特种材料有限公司 | A kind of method of chuck plug hot rolling heavy caliber titanium or titanium alloy thin-wall seamless pipe |
| CN109622659A (en) * | 2018-12-17 | 2019-04-16 | 安徽宝泰特种材料有限公司 | A kind of manufacturing method of heavy caliber TC4 titanium alloy thick-wall seamless material |
| CN112676374A (en) * | 2020-12-04 | 2021-04-20 | 安徽宝泰特种材料有限公司 | Preparation method of pure titanium target spare tube of magnetron sputtering film |
| CN112718910A (en) * | 2020-12-08 | 2021-04-30 | 安徽宝泰特种材料有限公司 | Manufacturing method of large-caliber TC4 titanium alloy thick-wall pipe |
-
2021
- 2021-12-21 CN CN202111570078.3A patent/CN114260314B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4991419A (en) * | 1988-11-18 | 1991-02-12 | Sumitomo Metal Industries, Ltd. | Method of manufacturing seamless tube formed of titanium material |
| CN106493187A (en) * | 2016-10-27 | 2017-03-15 | 南京宝泰特种材料股份有限公司 | A kind of heavy caliber thick wall titanium and its low-cost manufacture method of alloy seamless tubing |
| CN107052076A (en) * | 2016-11-28 | 2017-08-18 | 安徽宝泰特种材料有限公司 | A kind of method of chuck plug hot rolling heavy caliber titanium or titanium alloy thin-wall seamless pipe |
| CN109622659A (en) * | 2018-12-17 | 2019-04-16 | 安徽宝泰特种材料有限公司 | A kind of manufacturing method of heavy caliber TC4 titanium alloy thick-wall seamless material |
| CN112676374A (en) * | 2020-12-04 | 2021-04-20 | 安徽宝泰特种材料有限公司 | Preparation method of pure titanium target spare tube of magnetron sputtering film |
| CN112718910A (en) * | 2020-12-08 | 2021-04-30 | 安徽宝泰特种材料有限公司 | Manufacturing method of large-caliber TC4 titanium alloy thick-wall pipe |
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