CN112157431A - Manufacturing process of high-precision cold drawn pipe - Google Patents
Manufacturing process of high-precision cold drawn pipe Download PDFInfo
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- CN112157431A CN112157431A CN202010904939.6A CN202010904939A CN112157431A CN 112157431 A CN112157431 A CN 112157431A CN 202010904939 A CN202010904939 A CN 202010904939A CN 112157431 A CN112157431 A CN 112157431A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P23/00—Machines or arrangements of machines for performing specified combinations of different metal-working operations not covered by a single other subclass
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Abstract
The invention discloses a manufacturing process of a high-precision cold drawn pipe, which comprises the steps of heating, perforating, annealing, primary acid washing, cold rolling, stress relief annealing, secondary acid washing treatment, phosphating treatment, saponification treatment, cold drawing, normalizing air cooling treatment, quenching treatment, honing, thermal straightening treatment and detection; by adding the relevant detection and screening steps, unqualified products can be detected and removed in time, so that the further processing of the unqualified products is avoided, the processing energy and the manual operation are saved, and the unnecessary processing cost is reduced; and in addition, the rust removal and the fine grain refining treatment of the cold drawn pipe crystallization are added in the manufacturing process to remove surface pits, so that the overall yield is improved after the high-precision cold drawn pipe is manufactured.
Description
Technical Field
The invention belongs to the technical field of cold drawn pipe manufacturing processes, and particularly relates to a manufacturing process of a high-precision cold drawn pipe.
Background
The precision cold drawn pipe is a high precision steel pipe material which uses cold drawn seamless pipe as raw material to make tolerance control and surface bright processing, and has the characteristics of high precision, high finish, good inner wall cleanliness, no leakage when the steel pipe bears high pressure, no deformation in cold bending, flaring, flattening and no crack, etc., and can be used for various complex deformation and mechanical processing.
At present, most of high-precision cold drawn pipes are directly processed in batches, and the steps of detecting and removing unqualified raw materials are lacked in related processing flows, so that the phenomenon of high reject ratio can occur after the processing is finished, the processing resources are wasted by further processing the unqualified raw materials, and the manufacturing cost is increased.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a manufacturing process of a high-precision cold drawn pipe.
The purpose of the invention can be realized by the following technical scheme:
a manufacturing process of a high-precision cold drawn pipe comprises the steps of heating, perforating, annealing, primary acid washing, cold rolling, stress relief annealing, secondary acid washing, phosphating, saponification, cold drawing, normalizing air cooling, quenching, honing, heat straightening and detecting, and comprises the following steps:
(1) heating: uniformly heating the tube blank in an annular furnace;
(2) perforating: perforating the heat pipe blank by a perforating machine to obtain a steel pipe prototype;
(3) annealing: introducing the perforated pipe blank into a continuous annealing furnace for annealing to obtain an annealed pipe blank;
(4) pickling for the first time, pickling the tube blank with acid liquid after annealing, and judging whether the quality of the tube blank is enough to meet the requirement by observing whether a large amount of bubbles exist on the surface of the tube blank to remove unqualified products;
(5) cold rolling: introducing the annealed pipe blank into a pipe mill for cold rolling to obtain a rolled pipe;
(6) stress relief annealing: introducing the rolled tube into a heating furnace for heating and heat preservation, cooling along with the furnace, and discharging to obtain a high-strength annealed tube blank;
(7) and (3) acid washing treatment for the second time: pickling the annealed tube blank to remove the rust on the surface;
(8) and (3) phosphating treatment: forming a chemical generation coating of zinc phosphate on the surface of the tube blank;
(9) saponification treatment: forming a lubricating coating such as a metal soap on the coating;
(10) cold drawing: carrying out cold drawing processing on the cold-drawn pipe blank to obtain a cold-drawn pipe;
(11) normalizing and air cooling treatment: heating the cold drawn pipe, keeping the temperature for a period of time, discharging the cold drawn pipe from the furnace, and air cooling to refine crystal grains of the cold drawn pipe and prevent pits from appearing on the surface of the steel pipe;
(12) quenching treatment: quenching the cold drawn pipe, sending the cold drawn welded pipe into a quenching furnace, and cooling the welded pipe in an oil cooling mode; then the welded pipe is sent into a tempering furnace, and finally the welded pipe is cooled in a water cooling mode, so that the residual stress of the cold drawn pipe is reduced;
(13) honing: honing the cold drawn pipe by using a honing machine to enable the cold drawn pipe to reach high standard precision;
(14) and (3) thermal straightening treatment: preserving heat in a low-temperature tempering furnace, and then performing thermal straightening treatment to obtain a high-precision cold drawn pipe;
(15) and (3) detection: screening out unqualified products and removing the unqualified products.
The invention has the beneficial effects that: by adding the relevant detection and screening steps, unqualified products can be detected and removed in time, so that the further processing of the unqualified products is avoided, the processing energy and the manual operation are saved, and the unnecessary processing cost is reduced; and in addition, the rust removal and the fine grain refining treatment of the cold drawn pipe crystallization are added in the manufacturing process to remove surface pits, so that the overall yield is improved after the high-precision cold drawn pipe is manufactured.
Detailed Description
The technical scheme of the invention is further described as follows:
a manufacturing process of a high-precision cold drawn pipe comprises the steps of heating, perforating, annealing, primary acid washing, cold rolling, stress relief annealing, secondary acid washing, phosphating, saponification, cold drawing, normalizing air cooling, quenching, honing, heat straightening and detecting, and comprises the following steps:
(1) heating: uniformly heating the tube blank in an annular furnace;
(2) perforating: perforating the heat pipe blank by a perforating machine to obtain a steel pipe prototype;
(3) annealing: introducing the perforated pipe blank into a continuous annealing furnace for annealing to obtain an annealed pipe blank;
(4) pickling for the first time, pickling the tube blank with acid liquid after annealing, and judging whether the quality of the tube blank is enough to meet the requirement by observing whether a large amount of bubbles exist on the surface of the tube blank to remove unqualified products; if a large amount of bubbles are generated, the quality of the tube blank cannot meet the corresponding standard, and screening and taking out are carried out;
(5) cold rolling: introducing the annealed pipe blank into a pipe mill for cold rolling to obtain a rolled pipe;
(6) stress relief annealing: introducing the rolled tube into a heating furnace for heating and heat preservation, cooling along with the furnace, and discharging to obtain a high-strength annealed tube blank;
(7) and (3) acid washing treatment for the second time: pickling the annealed tube blank to remove the rust on the surface;
(8) and (3) phosphating treatment: forming a chemical generation coating of zinc phosphate on the surface of the tube blank;
(9) saponification treatment: forming a lubricating coating such as a metal soap on the coating;
(10) cold drawing: carrying out cold drawing processing on the cold-drawn pipe blank to obtain a cold-drawn pipe;
(11) normalizing and air cooling treatment: heating the cold drawn pipe, keeping the temperature for a period of time, discharging the cold drawn pipe from the furnace, and air cooling to refine crystal grains of the cold drawn pipe and prevent pits from appearing on the surface of the steel pipe;
(12) quenching treatment: quenching the cold drawn pipe, sending the cold drawn welded pipe into a quenching furnace, and cooling the welded pipe in an oil cooling mode; then the welded pipe is sent into a tempering furnace, and finally the welded pipe is cooled in a water cooling mode, so that the residual stress of the cold drawn pipe is reduced;
(13) honing: honing the cold drawn pipe by using a honing machine to enable the cold drawn pipe to reach high standard precision;
(14) and (3) thermal straightening treatment: preserving heat in a low-temperature tempering furnace, and then performing thermal straightening treatment to obtain a high-precision cold drawn pipe;
(15) and (3) detection: screening out unqualified products and removing the unqualified products.
After the pipe blank is processed by related processes of heating, perforating, annealing, primary pickling, cold rolling, stress relief annealing, secondary pickling, phosphating, saponification, cold drawing, normalizing air cooling, quenching, honing, heat straightening and detection, unqualified products can be detected and removed in time, further processing of the unqualified products is avoided, processing energy and manual operation are saved, and unnecessary investment processing cost is reduced; and in addition, the rust removal and the fine grain refining treatment of the cold drawn pipe crystallization are added in the manufacturing process to remove surface pits, so that the overall yield is improved after the high-precision cold drawn pipe is manufactured.
Finally, it should be noted that:
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, improvements and the like that are within the spirit and principle of the present invention are intended to be included in the scope of the present invention.
Claims (1)
1. A manufacturing process of a high-precision cold drawn pipe comprises the steps of heating, perforating, annealing, primary acid washing, cold rolling, stress relief annealing, secondary acid washing, phosphating, saponification, cold drawing, normalizing air cooling, quenching, honing, thermal straightening and detecting, and is characterized by comprising the following steps:
(1) heating: uniformly heating the tube blank in an annular furnace;
(2) perforating: perforating the heat pipe blank by a perforating machine to obtain a steel pipe prototype;
(3) annealing: introducing the perforated pipe blank into a continuous annealing furnace for annealing to obtain an annealed pipe blank;
(4) pickling for the first time, pickling the tube blank with acid liquid after annealing, and judging whether the quality of the tube blank is enough to meet the requirement by observing whether a large amount of bubbles exist on the surface of the tube blank to remove unqualified products;
(5) cold rolling: introducing the annealed pipe blank into a pipe mill for cold rolling to obtain a rolled pipe;
(6) stress relief annealing: introducing the rolled tube into a heating furnace for heating and heat preservation, cooling along with the furnace, and discharging to obtain a high-strength annealed tube blank;
(7) and (3) acid washing treatment for the second time: pickling the annealed tube blank to remove the rust on the surface;
(8) and (3) phosphating treatment: forming a chemical generation coating of zinc phosphate on the surface of the tube blank;
(9) saponification treatment: forming a lubricating coating such as a metal soap on the coating;
(10) cold drawing: carrying out cold drawing processing on the cold-drawn pipe blank to obtain a cold-drawn pipe;
(11) normalizing and air cooling treatment: heating the cold drawn pipe, keeping the temperature for a period of time, discharging the cold drawn pipe from the furnace, and air cooling to refine crystal grains of the cold drawn pipe and prevent pits from appearing on the surface of the steel pipe;
(12) quenching treatment: quenching the cold drawn pipe, sending the cold drawn welded pipe into a quenching furnace, and cooling the welded pipe in an oil cooling mode; then the welded pipe is sent into a tempering furnace, and finally the welded pipe is cooled in a water cooling mode, so that the residual stress of the cold drawn pipe is reduced;
(13) honing: honing the cold drawn pipe by using a honing machine to enable the cold drawn pipe to reach high standard precision;
(14) and (3) thermal straightening treatment: preserving heat in a low-temperature tempering furnace, and then performing thermal straightening treatment to obtain a high-precision cold drawn pipe;
(15) and (3) detection: screening out unqualified products and removing the unqualified products.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010904939.6A CN112157431A (en) | 2020-09-01 | 2020-09-01 | Manufacturing process of high-precision cold drawn pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010904939.6A CN112157431A (en) | 2020-09-01 | 2020-09-01 | Manufacturing process of high-precision cold drawn pipe |
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| Publication Number | Publication Date |
|---|---|
| CN112157431A true CN112157431A (en) | 2021-01-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010904939.6A Pending CN112157431A (en) | 2020-09-01 | 2020-09-01 | Manufacturing process of high-precision cold drawn pipe |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1402441A (en) * | 1971-07-02 | 1975-08-06 | Faure Bertrand Ets | Machine for cutting tubes and doming their ends and a tube- length obtained by the use of such machine |
| CN101172287A (en) * | 2007-11-14 | 2008-05-07 | 攀钢集团成都钢铁有限责任公司 | Limiting core rod cold drawn tube technique and equipment thereof |
| CN104338777A (en) * | 2013-07-31 | 2015-02-11 | 无锡大金高精度冷拔钢管有限公司 | Production method of cold-drawn precision seamless steel pipes |
-
2020
- 2020-09-01 CN CN202010904939.6A patent/CN112157431A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1402441A (en) * | 1971-07-02 | 1975-08-06 | Faure Bertrand Ets | Machine for cutting tubes and doming their ends and a tube- length obtained by the use of such machine |
| CN101172287A (en) * | 2007-11-14 | 2008-05-07 | 攀钢集团成都钢铁有限责任公司 | Limiting core rod cold drawn tube technique and equipment thereof |
| CN104338777A (en) * | 2013-07-31 | 2015-02-11 | 无锡大金高精度冷拔钢管有限公司 | Production method of cold-drawn precision seamless steel pipes |
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Application publication date: 20210101 |