CN111014441B - Manufacturing process of step tube - Google Patents
Manufacturing process of step tube Download PDFInfo
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- CN111014441B CN111014441B CN201911388412.6A CN201911388412A CN111014441B CN 111014441 B CN111014441 B CN 111014441B CN 201911388412 A CN201911388412 A CN 201911388412A CN 111014441 B CN111014441 B CN 111014441B
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- stage
- sizing section
- cold rolling
- section
- sizing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D31/00—Other methods for working sheet metal, metal tubes, metal profiles
- B21D31/02—Stabbing or piercing, e.g. for making sieves
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B17/00—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling
- B21B17/02—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling with mandrel, i.e. the mandrel rod contacts the rolled tube over the rod length
- B21B17/06—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling with mandrel, i.e. the mandrel rod contacts the rolled tube over the rod length in a discontinuous process
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D3/00—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/16—Heating or cooling
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/73—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals characterised by the process
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G3/00—Apparatus for cleaning or pickling metallic material
- C23G3/04—Apparatus for cleaning or pickling metallic material for cleaning pipes
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Metal Extraction Processes (AREA)
Abstract
The invention relates to a manufacturing process of a step pipe, wherein the step pipe is in a hollow cylinder shape and comprises a first stage and a second stage, and the first stage and the second stage are step-shaped; the manufacturing process comprises the following steps: hot piercing, surface treatment, cold rolling and straightening of straightness. The cold rolling process is the cold rolling of the inner die and the outer die on the steel pipe; the inner die is a core rod with a conical front end and comprises two sizing sections, and the joint of the two sizing sections is step-shaped; the outer mold comprises an upper roller and a lower roller; in the cold rolling process, the outer die performs circular reciprocating motion; the inner die repeatedly moves in the two sizing sections of cold rolling until the cold rolling is finished.
Description
Technical Field
The invention belongs to the field of cold rolling of steel pipes, and particularly relates to a cold rolling process of a step pipe.
Background
The existing steel pipe cold rolling process is mostly directed at common steel pipes, and a cold rolling process technology for step pipes does not exist.
Disclosure of Invention
The invention provides a manufacturing process of a step tube aiming at the step tube, wherein the step tube is in a hollow cylinder shape and comprises a first stage and a second stage, the inner diameter of the first stage is larger than that of the second stage, and the outer diameters of the first stage and the second stage are the same; the first stage and the second stage are step-shaped; the manufacturing process of the step tube comprises the following steps:
the method comprises the following steps: hot perforating, namely heating the round bar to 1100-1500 ℃, rotating the round bar at a high speed, and inserting the round bar into the top; the outer diameter side of the round rod is controlled through a roller, and the size of the outer diameter is adjusted to increase the outer diameter to 52 mm;
step two: performing surface treatment, namely using a PP tank to perform acid washing, water washing, phosphate film treatment, water washing, metal saponification and drying on the blank pipe obtained in the step one in sequence; the pickling step is to wash the steel plate with hydrochloric acid for 40-50min at normal temperature, and the washing step is to wash the steel plate with flowing water at normal temperature for 3-5 min; the phosphate involucra treatment is to soak in phosphating solution for 40-50 min; the secondary washing is carried out for 3-5min in flowing water at normal temperature again; the metal saponification is carried out by soaking in saponification liquid at 70 ℃ for 3-5 min; the drying is naturally drying after the steps are finished;
step three: cold rolling, namely cold rolling the steel pipe obtained in the step two by using an inner die and an outer die; the inner die is a core rod with a conical front end, the inner die comprises a first sizing section and a second sizing section, the outer diameter of the first sizing section is larger than that of the second sizing section, and the first sizing section and the second sizing section are step-shaped; the back of the first sizing section is connected with a preforming section, and the other end of the preforming section is connected with a power device; the outer die comprises an upper roller and a lower roller; the cold rolling process comprises a first sizing section stroke and a second sizing section stroke, wherein the first sizing section stroke is a first stage of the first sizing section cold rolling of the inner die; the second sizing section stroke is a second stage of the second sizing section cold rolling of the inner die;
in the cold rolling process, the outer die does circular reciprocating motion, and the outer diameter of the steel pipe is cold rolled while the upper roller and the lower roller rotate;
after the inner die finishes the first sizing section stroke, pulling back towards the power device in a shutdown state, and adjusting to a second sizing section stroke; after the second sizing section stroke is finished, in a stopped state, the steel wire is pushed forward in a direction away from the power device, and is adjusted to the first sizing section stroke, and the steps are repeated until the cold rolling is finished;
step four: and straightening the straightness of the cold-rolled steel pipe obtained in the third step.
The invention can realize the cold rolling process of the step pipe quickly, has convenient and quick process and saves time and cost.
Drawings
Fig. 1 is a schematic structural view of an inner mold and an outer mold of the present invention.
FIG. 2 is a schematic view of the structure of the stepped pipe of the present invention.
Detailed Description
Referring to fig. 1 and 2, a manufacturing process of a stepped pipe, the stepped pipe is a hollow cylinder shape and comprises a first stage 1 and a second stage 2, the inner diameter of the first stage 1 is larger than that of the second stage 2, and the outer diameters of the first stage 1 and the second stage 2 are the same; the first stage 1 and the second stage 2 are stepped. The manufacturing process of the step tube comprises the following steps:
the method comprises the following steps: hot perforating, heating the round bar to 1100 ℃, rotating the round bar at a high speed, and inserting the round bar into a top; the outer diameter side of the round rod is controlled through a roller, and the size of the outer diameter is adjusted to increase the outer diameter to 52 mm;
step two: performing surface treatment, namely using a PP tank to perform acid washing, water washing, phosphate film treatment, water washing, metal saponification and drying on the blank pipe obtained in the step one in sequence; the pickling step is that hydrochloric acid is used for washing for 40min at normal temperature, and the washing step is that washing is carried out in flowing water at normal temperature for 3; the phosphate involucra treatment is to soak in phosphating solution for 40 min; the secondary washing is secondary washing in normal-temperature flowing water 3; the metal saponification is carried out by soaking in saponification liquid at 70 ℃ for 3 min; the drying is naturally drying after the steps are finished;
step three: cold rolling, namely cold rolling the steel pipe obtained in the step two by using the inner die 3 and the outer die 4; the inner die 3 is a core rod with a conical front end, the inner die 3 comprises a first sizing section 31 and a second sizing section 32, the outer diameter of the first sizing section 31 is larger than that of the second sizing section 32, and the first sizing section 31 and the second sizing section 32 are step-shaped; the back of the first diameter section 31 is connected with a preforming section, and the other end of the preforming section is connected with a power device; the outer die 4 comprises an upper roller 41 and a lower roller 42; the cold rolling process comprises a first sizing section stroke and a second sizing section stroke, wherein the first sizing section stroke is a first stage 11 of cold rolling of a first sizing section 31 of the inner die 3; the second sizing section stroke is a second stage 12 of cold rolling of a second sizing section 32 of the inner die 3;
in the cold rolling process, the outer die 4 makes a circular reciprocating motion, and the outer diameter of the steel pipe is cold rolled while the upper roller 41 and the lower roller 42 rotate;
after the inner die 3 finishes the first sizing section stroke, pulling back towards the power device in a shutdown state, and adjusting to a second sizing section stroke; after the second sizing section stroke is finished, in a stopped state, the steel wire is pushed forward in a direction away from the power device, and is adjusted to the first sizing section stroke, and the steps are repeated until the cold rolling is finished;
step four: and straightening the straightness of the cold-rolled steel pipe obtained in the third step.
Example 1
Cold rolling a blank pipe, wherein the inner diameter of the blank pipe is 36mm, and the outer diameter of the blank pipe is 46 mm:
the length of the inner mold 3 is 860mm, and the inner mold comprises a first sizing section 31, a second sizing section 32 and a pre-forming section; the length of the first sizing section 31 is 150mm, the length of the second sizing section 32 is 220mm, and the length of the preforming section is 490 mm; the bottom of the pre-forming section is provided with a connecting device which is connected with a power device; the outer diameter of the first sizing section 31 is 17mm, the outer diameter of the second sizing section 32 is 15mm, and after cold rolling, the outer diameter of the finished step tube is 25mm, wherein the inner diameter of the first stage 1 is 17mm, and the inner diameter of the second stage 2 is 15 mm;
the cold rolling process of the step pipe comprises the following steps: cold rolling the length 20CM of the first stage 1 with the first gauge section 31 → stopping → drawing back 22CM in the power plant direction → cold rolling the length 15CM of the second stage 2 with the second gauge section 32 again → pushing forward 22CM in the direction away from the power plant → then cold rolling the length 20CM of the first stage 1 with the first gauge section 31 → stopping → drawing back 22CM in the power plant direction → finally cold rolling the length 15CM of the second stage 2 with the second gauge section 32.
Example 2
Cold rolling a blank pipe, wherein the inner diameter of the blank pipe is 35mm, and the outer diameter of the blank pipe is 46 mm:
the length of the inner mold 3 is 860mm, and the inner mold comprises a first sizing section 31, a second sizing section 32 and a pre-forming section; the length of the first sizing section 31 is 150mm, the length of the second sizing section 32 is 220mm, and the length of the preforming section is 490 mm; the bottom of the pre-forming section is provided with a connecting device which is connected with a power device; the outer diameter of the first sizing section 31 is 17mm, the outer diameter of the second sizing section 32 is 15mm, the outer diameter of the finished step pipe is 26mm after cold rolling, and the inner diameter of the first stage 1 is 17 mm. The inner diameter of the second stage 2 is 15 mm;
the cold rolling process of the step pipe comprises the following steps: cold rolling the length 20CM of the first stage 1 with the first gauge section 31 → stopping → drawing back 22CM in the power plant direction → cold rolling the length 15CM of the second stage 2 with the second gauge section 32 again → pushing forward 22CM in the direction away from the power plant → then cold rolling the length 20CM of the first stage 1 with the first gauge section 31 → stopping → drawing back 22CM in the power plant direction → finally cold rolling the length 15CM of the second stage 2 with the second gauge section 32.
Example 3
Cold rolling a blank pipe, wherein the inner diameter of the blank pipe is 37mm, and the outer diameter of the blank pipe is 46 mm:
the length of the inner mold 3 is 860mm, and the inner mold comprises a first sizing section 31, a second sizing section 32 and a pre-forming section; the length of the first sizing section 31 is 150mm, the length of the second sizing section 32 is 220mm, and the length of the preforming section is 490 mm; the bottom of the pre-forming section is provided with a connecting device which is connected with a power device; the outer diameter of the first sizing section 31 is 17mm, the outer diameter of the second sizing section 32 is 15mm, after cold rolling, the outer diameter of the finished step pipe is 24mm, and the inner diameter of the first stage 1 is 17 mm. The inner diameter of the second stage 2 is 15 mm;
the cold rolling process of the step pipe comprises the following steps: cold rolling the length 20CM of the first stage 1 with the first gauge section 31 → stopping → drawing back 22CM in the power plant direction → cold rolling the length 15CM of the second stage 2 with the second gauge section 32 again → pushing forward 22CM in the direction away from the power plant → then cold rolling the length 20CM of the first stage 1 with the first gauge section 31 → stopping → drawing back 22CM in the power plant direction → finally cold rolling the length 15CM of the second stage 2 with the second gauge section 32.
Claims (1)
1. A manufacturing process of a step pipe is characterized in that: the stepped pipe is in a hollow cylindrical shape and comprises a first stage (1) and a second stage (2), wherein the inner diameter of the first stage (1) is larger than that of the second stage (2), and the outer diameters of the first stage (1) and the second stage (2) are the same; the first stage (1) and the second stage (2) are step-shaped; the manufacturing process of the step tube comprises the following steps:
the method comprises the following steps: hot perforating, namely heating the round bar to 1100-1500 ℃, rotating the round bar at a high speed, and inserting the round bar into the top; the outer diameter side of the round rod is controlled through a roller, and the size of the outer diameter is adjusted to increase the outer diameter to 52 mm;
step two: performing surface treatment, namely using a PP tank to perform acid washing, water washing, phosphate film treatment, water washing, metal saponification and drying on the blank pipe obtained in the step one in sequence; the pickling step is to wash the steel plate with hydrochloric acid for 40-50min at normal temperature, and the washing step is to wash the steel plate with flowing water at normal temperature for 3-5 min; the phosphate involucra treatment is to soak in phosphating solution for 40-50 min; the secondary washing is carried out for 3-5min in flowing water at normal temperature again; the metal saponification is carried out by soaking in saponification liquid at 70 ℃ for 3-5 min; the drying is naturally drying after the steps are finished;
step three: cold rolling, namely cold rolling the steel pipe obtained in the step two by using the inner die (3) and the outer die (4); the inner die (3) is a core rod with a conical front end, the inner die (3) comprises a first sizing section (31) and a second sizing section (32), the outer diameter of the first sizing section (31) is larger than that of the second sizing section (32), and the first sizing section (31) and the second sizing section (32) are step-shaped; the back of the first diameter section (31) is connected with a pre-forming section, and the other end of the pre-forming section is connected with a power device; the outer die (4) comprises an upper roller (41) and a lower roller (42); the cold rolling process comprises a first sizing section stroke and a second sizing section stroke, wherein the first sizing section stroke is a first sizing section (31) cold rolling stage (11) of the inner die (3); the second sizing section stroke is a second sizing section (32) cold rolling second stage (12) of the inner die (3);
in the cold rolling process, the outer die (4) makes circular reciprocating motion, and the outer diameter of the steel pipe is cold rolled while the upper roller (41) and the lower roller (42) rotate;
after the inner die (3) finishes the first sizing section stroke, the inner die is pulled backwards towards the direction of a power device in a shutdown state and is adjusted to a second sizing section stroke; after the second sizing section stroke is finished, in a stopped state, the steel wire is pushed forward in a direction away from the power device, and is adjusted to the first sizing section stroke, and the steps are repeated until the cold rolling is finished;
step four: and straightening the straightness of the cold-rolled steel pipe obtained in the third step.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911388412.6A CN111014441B (en) | 2019-12-30 | 2019-12-30 | Manufacturing process of step tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911388412.6A CN111014441B (en) | 2019-12-30 | 2019-12-30 | Manufacturing process of step tube |
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| Publication Number | Publication Date |
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| CN111014441A CN111014441A (en) | 2020-04-17 |
| CN111014441B true CN111014441B (en) | 2021-04-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911388412.6A Active CN111014441B (en) | 2019-12-30 | 2019-12-30 | Manufacturing process of step tube |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6012130B2 (en) * | 1980-12-25 | 1985-03-30 | 日本鋼管株式会社 | Continuous manufacturing method for seamless steel pipes with different outside diameters |
| JP3977687B2 (en) * | 2002-05-23 | 2007-09-19 | 株式会社アステア | Shock absorbing member |
| CN201558845U (en) * | 2009-05-10 | 2010-08-25 | 温州市金洛机械设备制造有限公司 | Cold rolling die suitable for special tube of double-roll cold rolled tube machine |
| CN102389900A (en) * | 2011-09-17 | 2012-03-28 | 西部钛业有限责任公司 | High-precision processing method for Ti-3Al-2.5V (TA18) aviation titanium tube |
| CN204486461U (en) * | 2015-03-31 | 2015-07-22 | 聊城鑫鹏源金属制造有限公司 | There is the cold pilger mill of reducing type plug |
| JP2015213950A (en) * | 2014-05-12 | 2015-12-03 | 湯川王冠株式会社 | Different-diameter pipe |
| CN205926597U (en) * | 2016-07-28 | 2017-02-08 | 张家港华裕有色金属材料有限公司 | Titanium or cold rolling wall forming device that increases of titanium alloy pipe |
| CN109013704A (en) * | 2018-08-04 | 2018-12-18 | 青岛浩檀汽车配件有限公司 | Seamless steel pipe manufacture craft |
-
2019
- 2019-12-30 CN CN201911388412.6A patent/CN111014441B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6012130B2 (en) * | 1980-12-25 | 1985-03-30 | 日本鋼管株式会社 | Continuous manufacturing method for seamless steel pipes with different outside diameters |
| JP3977687B2 (en) * | 2002-05-23 | 2007-09-19 | 株式会社アステア | Shock absorbing member |
| CN201558845U (en) * | 2009-05-10 | 2010-08-25 | 温州市金洛机械设备制造有限公司 | Cold rolling die suitable for special tube of double-roll cold rolled tube machine |
| CN102389900A (en) * | 2011-09-17 | 2012-03-28 | 西部钛业有限责任公司 | High-precision processing method for Ti-3Al-2.5V (TA18) aviation titanium tube |
| JP2015213950A (en) * | 2014-05-12 | 2015-12-03 | 湯川王冠株式会社 | Different-diameter pipe |
| CN204486461U (en) * | 2015-03-31 | 2015-07-22 | 聊城鑫鹏源金属制造有限公司 | There is the cold pilger mill of reducing type plug |
| CN205926597U (en) * | 2016-07-28 | 2017-02-08 | 张家港华裕有色金属材料有限公司 | Titanium or cold rolling wall forming device that increases of titanium alloy pipe |
| CN109013704A (en) * | 2018-08-04 | 2018-12-18 | 青岛浩檀汽车配件有限公司 | Seamless steel pipe manufacture craft |
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| CN111014441A (en) | 2020-04-17 |
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