CN112718868A - System and process for eliminating pockmarks on inner surface of hot rotary expansion steel pipe - Google Patents
System and process for eliminating pockmarks on inner surface of hot rotary expansion steel pipe Download PDFInfo
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- CN112718868A CN112718868A CN202011432888.8A CN202011432888A CN112718868A CN 112718868 A CN112718868 A CN 112718868A CN 202011432888 A CN202011432888 A CN 202011432888A CN 112718868 A CN112718868 A CN 112718868A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 58
- 239000010959 steel Substances 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims abstract description 33
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 32
- 230000003064 anti-oxidating effect Effects 0.000 claims abstract description 32
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 32
- 239000010439 graphite Substances 0.000 claims abstract description 32
- 239000000428 dust Substances 0.000 claims abstract description 26
- 238000005096 rolling process Methods 0.000 claims abstract description 22
- 238000005488 sandblasting Methods 0.000 claims abstract description 22
- 238000009987 spinning Methods 0.000 claims abstract description 18
- 230000001050 lubricating effect Effects 0.000 claims abstract description 17
- 230000003647 oxidation Effects 0.000 claims abstract description 17
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 17
- 239000011261 inert gas Substances 0.000 claims abstract description 15
- 238000004140 cleaning Methods 0.000 claims abstract description 14
- 238000001816 cooling Methods 0.000 claims abstract description 14
- 230000002265 prevention Effects 0.000 claims abstract description 9
- 229910021538 borax Inorganic materials 0.000 claims description 41
- 239000004328 sodium tetraborate Substances 0.000 claims description 41
- 235000010339 sodium tetraborate Nutrition 0.000 claims description 41
- 238000007664 blowing Methods 0.000 claims description 19
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 12
- 230000001681 protective effect Effects 0.000 claims description 6
- 239000004576 sand Substances 0.000 claims description 6
- 239000007921 spray Substances 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 238000003912 environmental pollution Methods 0.000 abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 239000000243 solution Substances 0.000 description 5
- 229910052742 iron Inorganic materials 0.000 description 4
- 239000012266 salt solution Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000010926 purge Methods 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 239000012267 brine Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B19/00—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work
- B21B19/02—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work the axes of the rollers being arranged essentially diagonally to the axis of the work, e.g. "cross" tube-rolling ; Diescher mills, Stiefel disc piercers or Stiefel rotary piercers
- B21B19/06—Rolling hollow basic material, e.g. Assel mills
- B21B19/08—Enlarging tube diameter
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B25/00—Mandrels for metal tube rolling mills, e.g. mandrels of the types used in the methods covered by group B21B17/00; Accessories or auxiliary means therefor ; Construction of, or alloys for, mandrels or plugs
- B21B25/04—Cooling or lubricating mandrels during operation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0239—Lubricating
- B21B45/0245—Lubricating devices
- B21B45/0263—Lubricating devices using solid lubricants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a hot-spinning expanding steel pipe inner surface pockmark eliminating system and process, the system of the invention comprises a sand blasting anti-oxidation dust removing device, a graphite lubricating device, a top head cooling and cleaning device and an inert gas protecting device, the process of the invention comprises the following steps: conveying the capillary formed by perforating the blank pipe by a perforating machine into a sand blasting anti-oxidation dust removing device to perform dephosphorization and anti-oxidation treatment on the inner surface of the capillary; in the process of dephosphorization and antioxidation treatment of the inner surface of the capillary, the ejector is sprayed with graphite by a graphite lubricating device to carry out anti-sticking treatment on the ejector; the capillary after dephosphorization and antioxidation treatment is sent into a rotary expanding machine, and the top head after the steel-sticking prevention treatment reaches a rolling station to carry out hot rotary expanding rolling on the capillary; and (4) feeding the pierced billet formed by hot rotary expansion rolling into an inert gas protection device for carrying out the oxidation prevention treatment of the pierced billet. The system and the process can effectively eliminate the pockmarks on the inner surface of the hot-rotary-expanding steel pipe, greatly improve the product quality of the hot-rotary-expanding steel pipe, and have no environmental pollution and potential safety hazard in production.
Description
Technical Field
The invention belongs to the technical field of machining, and particularly relates to a system and a process for eliminating pockmarks on the inner surface of a hot-spinning steel pipe.
Background
The hot rotary expanding machine set is equipment for producing large-diameter seamless middle-wall and thin-wall steel pipes from small blanks, and pits are generated on the inner surface of the hot rotary expanding steel pipe rolled by the hot rotary expanding machine set due to the deformation characteristics of the hot rotary expanding process. In detail, on one hand, iron oxide scales and impurities on the inner surface of a hollow billet formed after the hollow billet is perforated by a perforating machine, and iron oxide scales and impurities attached to the outer surface of a top head of a hot rotary expanding unit are extruded into the inner wall of a steel pipe in the process of rolling the hollow billet by the hot rotary expanding unit, and fall off from the inner wall of the hollow billet after hot rotary expanding rolling is finished, so that pits (pockmarks) are formed on the inner surface of the hot rotary expanding steel pipe; on the other hand, the steel dipping of the top of the hot rotary expanding unit is also an important factor for forming pits on the inner surface of the hot rotary expanding steel pipe.
In the short-flow thermal rotary expansion unit production line in the prior art, a salt solution spraying mode is usually adopted to remove phosphorus from a capillary tube penetrating out of a perforating machine so as to eliminate pockmarks on the inner surface of a steel tube. Although the method can basically meet the quality requirement of the steel pipe, the method has the advantages of large one-time investment cost, higher operation and maintenance cost, damage to the thermal rotary expansion unit due to the higher corrosivity of the salt solution, seriously influenced operation sight by the brine steam generated in the dephosphorization process and poorer production safety.
Disclosure of Invention
To solve the above problems in the prior art, in one aspect of the present invention, there is provided a hot-spinning steel pipe inner surface pockmark removing system, including:
the sand blasting oxidation-resistant dust removal device is arranged between the puncher and the rotary expander, and a capillary formed after the billet is punched by the puncher is subjected to dephosphorization and oxidation-resistant treatment on the inner surface of the capillary in the sand blasting oxidation-resistant dust removal device;
the graphite lubricating device and the plug cooling and cleaning device are arranged between the first section and the second section of the outlet platform of the rotary expander, the graphite lubricating device sprays graphite on the plug and dries the graphite to form a protective film, and the plug cooling and cleaning device cleans and cools the plug;
and the inert gas protection device is arranged on the outlet side of one section of the outlet table of the rotary expanding machine and is used for carrying out pierced billet anti-oxidation treatment on pierced billets formed by hot rotary expanding rolling.
As a specific embodiment, in the above pitting removal system for the inner surface of a hot-spun expanded steel pipe, the sand blasting, oxidation resisting and dust removing device includes: the system comprises a conveying roller way, a borax blowing component, a borax absorbing component and a dust removing component, wherein the borax blowing component is installed on the outlet side of the conveying roller way, the borax absorbing component is installed on the inlet side of the conveying roller way, and the dust removing component is installed on the top of the sand absorbing component.
In order to solve the problems in the prior art, in another aspect of the present invention, there is provided a hot-spinning steel pipe inner surface pockmark removing process implemented by using the system, including:
conveying the blank pipe into a sand blasting anti-oxidation dust removal device after the blank pipe is perforated by a perforating machine, and carrying out dephosphorization and anti-oxidation treatment on the inner surface of the blank pipe;
in the process of dephosphorization and antioxidation treatment of the inner surface of the capillary, the ejector is sprayed with graphite by a graphite lubricating device to carry out anti-sticking treatment on the ejector;
the capillary after dephosphorization and antioxidation treatment is sent into a rotary expanding machine, and the top head after the steel-sticking prevention treatment reaches a rolling station to carry out hot rotary expanding rolling on the capillary;
and (4) feeding the pierced billet formed by hot rotary expansion rolling into an inert gas protection device for carrying out the oxidation prevention treatment of the pierced billet.
Preferably, the process for eliminating pockmarks on the inner surface of the hot-spun expanded steel pipe further comprises: and after the hot rotary expansion rolling is finished, the ejector head is extracted from the pierced billet and returns to the graphite lubricating device, and then enters the ejector head cooling and cleaning device to clean and cool the ejector head.
As a specific implementation mode, in the process for removing pits on the inner surface of the hot-rotary-expanding steel tube, in the dephosphorization and antioxidation treatment of the inner surface of the capillary, after the capillary penetrates out by the puncher, the capillary is shifted into a conveying roller way of a sand-blasting antioxidation dust removal device, the borax blowing component performs alignment according to the tube head of the capillary, and the borax sucking component performs alignment and alignment according to the tail of the capillary; after the borax blowing component and the borax sucking component are aligned relative to the capillary, the conveying roller table rotates, the borax blowing component, the borax sucking component and the dust removing component start working to carry out dephosphorization and antioxidation treatment, wherein the borax blowing component carries out sand blasting at the tube head of the capillary, the borax sucking component carries out sand sucking at the tail of the capillary, iron oxide scales on the inner surface of the capillary are removed, and the inner surface of the capillary is coated with borax to prevent the surface from being further oxidized.
In the above-described pitting removal process for the inner surface of the hot-spun steel pipe, in the treatment of the plug anti-sticking steel, graphite is uniformly coated on the surface of the plug and dried to form a protective film.
The hot-spinning expanding steel pipe inner surface pockmark eliminating system and the process can reduce the generation of iron scales in the steel pipe and prevent the iron scales from being adhered to the top head, thereby effectively eliminating the hot-spinning expanding steel pipe inner surface pockmark, enhancing the protection of the steel pipe inner surface, greatly improving the product quality of the hot-spinning expanding steel pipe, and having no environmental pollution and production potential safety hazard.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a block diagram schematically showing the construction of a hot rotary-expanding steel pipe inner surface pockmark removing system according to the present invention.
FIG. 2 is a schematic structural diagram of a sand blasting oxidation-resistant dust removal device in the hot-spinning expanding steel pipe inner surface pockmark elimination system.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 and 2, the system for eliminating pockmarks on the inner surface of a hot-spun expanded steel pipe of the present invention comprises: the sand blasting oxidation-resistant dust removal device 101 is arranged between the puncher 11 and the rotary expander 12, and the inner surface of a capillary formed after the blank pipe is punched by the puncher 11 is subjected to dephosphorization and oxidation-resistant treatment in the sand blasting oxidation-resistant dust removal device 101; the graphite lubricating device 102 and the top head cooling and cleaning device 103 are arranged between the first section and the second section of the outlet platform of the rotary expander 12, the graphite lubricating device 102 sprays graphite on the top head and dries the graphite to form a protective film, and the top head cooling and cleaning device 103 cleans and cools the top head; and the inert gas protection device 104 is arranged on the outlet side of one section of the outlet table of the rotary expanding machine 12, and the inert gas protection device 104 is used for performing pierced billet anti-oxidation treatment on pierced billets formed by hot rotary expanding rolling.
The sand blasting oxidation resistant dust removing apparatus 101 mainly comprises: a conveying roller table 201, a borax blowing assembly 202, a borax sucking assembly 203 and a dust removing assembly 204. The borax blowing assembly 202 is installed on the outlet side of the conveying roller way 201, the borax suction assembly 203 is installed on the inlet side of the conveying roller way 201, and the dust removal assembly 204 is installed on the top of the sand suction assembly 203.
The process for eliminating the pockmarks on the inner surface of the hot-spinning steel pipe mainly comprises the following three process steps: 1. dephosphorization and antioxidation treatment are carried out on the inner surface of the capillary, 2, steel sticking prevention treatment is carried out on the top, and 3, antioxidation treatment is carried out on the pierced billet. Specifically, the blank pipe is perforated by a perforating machine 11 to form a capillary, and the capillary is sent into a sand blasting anti-oxidation dust removal device 101 to carry out dephosphorization and anti-oxidation treatment on the inner surface of the capillary; in the process of dephosphorization and antioxidation treatment of the inner surface of the capillary, the ejector is sprayed with graphite by a graphite lubricating device 102 to carry out anti-sticking treatment on the ejector; then the capillary after dephosphorization and antioxidation treatment is sent to a rotary expanding machine 12, the top head after the steel-sticking prevention treatment reaches a rolling station, and the hot rotary expanding rolling of the capillary is carried out; the pierced billet formed by hot rotary expansion rolling is sent into an inert gas protection device 104 for carrying out the oxidation prevention treatment of the pierced billet.
Preferably, the process for eliminating pockmarks on the inner surface of the hot-spinning steel pipe can further comprise the following steps: after the hot rotary expansion rolling is finished, the ejector is extracted from the pierced billet and returned to the graphite lubricating device 102, and then enters the ejector cooling and cleaning device 103 for cleaning and cooling, and the ejector is cleaned and cooled by the ejector cooling and cleaning device 103, so that the anti-sticking steel treatment effect of the ejector can be further improved.
The specific implementation of the hot-spinning steel pipe inner surface pockmark eliminating process is called as follows:
after the puncher 11 penetrates out of the capillary, the capillary is pushed into a conveying roller table 201 of the sand blasting anti-oxidation dust removal device 101, a borax blowing assembly 202 aligns according to the pipe head of the capillary, and a borax sucking assembly 203 aligns and aligns according to the tail of the capillary;
after the borax blowing component 202 and the borax absorbing component 203 are aligned relative to the capillary, the conveying roller table 201 starts to rotate, the borax blowing component 202, the borax absorbing component 203 and the dust removing component 204 start to work to carry out dephosphorization and antioxidation treatment, the borax blowing component 202 carries out sand blasting at the tube head of the capillary, the borax absorbing component 203 carries out sand absorbing at the tail of the capillary, iron oxide scales on the inner surface of the capillary are removed, and borax is coated on the inner surface of the capillary to prevent the surface from being further oxidized;
in the process of dephosphorization and antioxidation treatment of the inner surface of the capillary, the ejector sprays graphite in a graphite lubricating device 102 to perform anti-sticking steel treatment of the ejector, the graphite is uniformly coated on the surface of the ejector and is dried to form a protective film, and the characteristic that the graphite is high temperature resistant and does not react with steel is utilized to ensure that the ejector is not stuck with the steel;
after the sand blasting of the capillary is finished, the borax blowing component 202 and the borax absorbing component 203 return to the original positions, the conveying roller table 201 conveys the capillary to the rotary expanding machine 12, and meanwhile, the top treated by the anti-sticking steel reaches a rolling station to perform hot rotary expanding rolling on the capillary;
after the hollow billet is rolled by the rotary expanding machine to form a hollow billet, the ejector head is drawn out from the hollow billet through the pipe stripping die orifice, the hollow billet passes through the graphite lubricating device 102 and then reaches the ejector head cooling and cleaning device 103 to be cleaned and cooled, the hollow billet is turned over to the inert gas protection device 104 from one section of outlet side of the outlet platform of the rotary expanding machine 12, the inert gas protection device 104 purges the inert gas for the hollow billet so as to purge and remove residual iron oxide scales in the hollow billet, and the inner surface of the hollow billet is protected against oxidation by the inert gas. And then, according to the practical application requirement of the hot rotary expanding steel pipe, the pierced billet enters the subsequent process.
In the hot rotary expanding steel pipe inner surface pockmark eliminating system and the process, the novel antioxidant equipment is adopted to replace a salt solution dephosphorization system in the prior art, so that the investment cost and the production running cost of the equipment are reduced, and the pollution is reduced; through the graphite lubricating device and the plug cooling and cleaning device which are arranged on the outlet table of the rotary expanding machine, the plug can be effectively prevented from being stained with steel and is not easy to adhere to the steel, and the service life of the plug is prolonged; the inert gas protection device arranged at the outlet table of the rotary expanding machine ensures the quality of the inner surface of the hot rotary expanding steel pipe and provides certain inert gas anti-oxidation protection for the inner surface of the hot rotary expanding steel pipe.
In conclusion, the hot-spinning expanding steel pipe inner surface pockmark eliminating system and the process can reduce the generation of iron scales in the steel pipe and prevent the iron scales from being adhered to the top head, thereby effectively eliminating the hot-spinning expanding steel pipe inner surface pockmark, simultaneously enhancing the protection of the steel pipe inner surface, greatly improving the product quality of the hot-spinning expanding steel pipe, and having no environmental pollution and production potential safety hazard.
It is to be noted that, in this document, the term "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion, so that an article or an apparatus including a series of elements includes not only those elements but also other elements not explicitly listed or inherent to such article or apparatus. Meanwhile, the term "connected" and the like as used herein should be broadly interpreted as referring to a fixed connection, a detachable connection, a direct connection, or an indirect connection through intermediate components. In addition, "front", "rear", "left", "right", "upper", "lower", "inner", "outer", and the like are referred to herein as being placed in the state shown in the drawings.
It should be further noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and are not limited thereto; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or alterations do not depart from the spirit of the invention.
Claims (6)
1. A hot-spinning expanding steel pipe inner surface pockmark eliminating system is characterized by comprising:
the sand blasting oxidation-resistant dust removal device is arranged between the puncher and the rotary expander, and a capillary formed after the billet is punched by the puncher is subjected to dephosphorization and oxidation-resistant treatment on the inner surface of the capillary in the sand blasting oxidation-resistant dust removal device;
the graphite lubricating device and the plug cooling and cleaning device are arranged between the first section and the second section of the outlet platform of the rotary expander, the graphite lubricating device sprays graphite on the plug and dries the graphite to form a protective film, and the plug cooling and cleaning device cleans and cools the plug;
and the inert gas protection device is arranged on the outlet side of one section of the outlet table of the rotary expanding machine and is used for carrying out pierced billet anti-oxidation treatment on pierced billets formed by hot rotary expanding rolling.
2. The system for eliminating pockmarks on the inner surface of the hot-spun expanded steel pipe as claimed in claim 1, wherein the sand-blasting, oxidation-resisting and dust-removing device comprises: the system comprises a conveying roller way, a borax blowing component, a borax absorbing component and a dust removing component, wherein the borax blowing component is installed on the outlet side of the conveying roller way, the borax absorbing component is installed on the inlet side of the conveying roller way, and the dust removing component is installed on the top of the sand absorbing component.
3. The hot-spinning expanding steel pipe inner surface pockmark removal process implemented by the hot-spinning expanding steel pipe inner surface pockmark removal system of claim 2, wherein the hot-spinning expanding steel pipe inner surface pockmark removal process comprises the following steps:
conveying the blank pipe into a sand blasting anti-oxidation dust removal device after the blank pipe is perforated by a perforating machine, and carrying out dephosphorization and anti-oxidation treatment on the inner surface of the blank pipe;
in the process of dephosphorization and antioxidation treatment of the inner surface of the capillary, the ejector is sprayed with graphite by a graphite lubricating device to carry out anti-sticking treatment on the ejector;
the capillary after dephosphorization and antioxidation treatment is sent into a rotary expanding machine, and the top head after the steel-sticking prevention treatment reaches a rolling station to carry out hot rotary expanding rolling on the capillary;
and (4) feeding the pierced billet formed by hot rotary expansion rolling into an inert gas protection device for carrying out the oxidation prevention treatment of the pierced billet.
4. The process for eliminating pockmarks on the inner surface of a hot-spun expanded steel pipe as claimed in claim 3, further comprising: and after the hot rotary expansion rolling is finished, the ejector head is extracted from the pierced billet and returns to the graphite lubricating device, and then enters the ejector head cooling and cleaning device to clean and cool the ejector head.
5. The process for removing pockmarks on the inner surface of the hot-rotary-expanding steel tube as claimed in claim 4, wherein in the dephosphorization and antioxidation treatment of the inner surface of the capillary, after the capillary is penetrated out by the puncher, the capillary is pushed into a conveying roller way of a sand-blasting antioxidation dust removal device, the borax blowing component carries out alignment according to the tube head of the capillary, and the borax sucking component carries out alignment and alignment according to the tail of the capillary; after the borax blowing component and the borax sucking component are aligned relative to the capillary, the conveying roller table rotates, the borax blowing component, the borax sucking component and the dust removing component start working to carry out dephosphorization and antioxidation treatment, wherein the borax blowing component carries out sand blasting at the tube head of the capillary, the borax sucking component carries out sand sucking at the tail of the capillary, iron oxide scales on the inner surface of the capillary are removed, and the inner surface of the capillary is coated with borax to prevent the surface from being further oxidized.
6. The process for eliminating pitting on the inner surface of a hot-spun steel pipe as claimed in claim 5, wherein in the treatment of the plug anti-sticking steel, graphite is uniformly coated on the surface of the plug and dried to form a protective film.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011432888.8A CN112718868A (en) | 2020-12-10 | 2020-12-10 | System and process for eliminating pockmarks on inner surface of hot rotary expansion steel pipe |
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| CN202011432888.8A CN112718868A (en) | 2020-12-10 | 2020-12-10 | System and process for eliminating pockmarks on inner surface of hot rotary expansion steel pipe |
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