CN116689480A - Processing and manufacturing method of seamless pipe - Google Patents
Processing and manufacturing method of seamless pipe Download PDFInfo
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- CN116689480A CN116689480A CN202310752058.0A CN202310752058A CN116689480A CN 116689480 A CN116689480 A CN 116689480A CN 202310752058 A CN202310752058 A CN 202310752058A CN 116689480 A CN116689480 A CN 116689480A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- 238000003672 processing method Methods 0.000 title claims abstract description 10
- 238000010438 heat treatment Methods 0.000 claims abstract description 38
- 238000000034 method Methods 0.000 claims abstract description 37
- 230000008569 process Effects 0.000 claims abstract description 28
- 238000004513 sizing Methods 0.000 claims abstract description 28
- 238000005520 cutting process Methods 0.000 claims abstract description 18
- 239000000463 material Substances 0.000 claims abstract description 12
- 238000004080 punching Methods 0.000 claims abstract description 8
- 230000008719 thickening Effects 0.000 claims abstract description 8
- 238000001816 cooling Methods 0.000 claims description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 230000009467 reduction Effects 0.000 claims description 11
- 238000012856 packing Methods 0.000 claims description 8
- 230000002035 prolonged effect Effects 0.000 claims description 7
- 238000005096 rolling process Methods 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 4
- 230000001590 oxidative effect Effects 0.000 claims description 4
- 239000013589 supplement Substances 0.000 claims description 4
- 230000001502 supplementing effect Effects 0.000 claims description 4
- 238000010301 surface-oxidation reaction Methods 0.000 claims description 4
- 238000005516 engineering process Methods 0.000 abstract description 2
- 230000001419 dependent effect Effects 0.000 abstract 1
- 239000000047 product Substances 0.000 description 9
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
- B21B1/18—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section in a continuous process
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
-
- 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
- B21B17/08—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 having one or more protrusions, i.e. only the mandrel plugs contact the rolled tube; Press-piercing mills
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B43/00—Cooling beds, whether stationary or moving; Means specially associated with cooling beds, e.g. for braking work or for transferring it to or from the bed
- B21B43/04—Cooling beds comprising rolls or worms
-
- 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
- B21B45/004—Heating the product
-
- 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
- B21B45/08—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 hydraulically
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B15/0007—Cutting or shearing the product
- B21B2015/0014—Cutting or shearing the product transversely to the rolling direction
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Extraction Processes (AREA)
Abstract
The invention discloses a processing and manufacturing method of a seamless pipe, which relates to the field of seamless pipe processing, and comprises the following steps: s1, a tube blank heating step, namely cutting the tube blank according to the process length requirement, feeding the tube blank into a stepping furnace for heating, enabling the temperature to reach 1260-1280 ℃, pushing out the material by a pusher and conveying the material to a puncher, and then carrying out punching operation; according to the invention, the oil cylinder device is added at the locking position of the portal frame, the wall thickness of the capillary is dependent on the roll gap, the guide distance and the forward extension of the ejection head during punching, the added oil cylinder device ejects the capillary during biting and ejection, which is equal to the increase of the ejection extension of the ejection head, so that the wall thickness of the head and tail punching holes is properly reduced, the two ends of the punched capillary are thin and the middle is thick, the two-end sharpening technology is adopted, after the capillary enters the stretch reducing sizing process, the head and tail thickening during the stretch reducing sizing process is inhibited due to the small wall thickness of the two ends, the yield is improved, the arrangement of two punching machines and one stretch reducing machine is adopted, the equipment utilization rate of the stretch reducing machine is improved, and the investment is saved.
Description
Technical Field
The invention relates to the field of seamless tube processing, in particular to a processing and manufacturing method of a seamless tube.
Background
Is a long steel material with hollow section and without seam on the periphery. A seamless tube, the thinner the wall thickness of the product, the more economical and practical it is, the thinner the wall thickness, and the greater it rises; secondly, the process of the product determines the limitation performance of the product, and the precision of a general seamless steel tube is low: the wall thickness is uneven, the brightness of the surface light inside and outside the pipe is low, the fixed-length cost is high, and the pits and black spots on the inner and outer surfaces are not easy to remove; thirdly, its detection and shaping must be handled off-line. Therefore, it has the advantages in the aspects of high pressure, high strength and mechanical structural materials.
The traditional seamless tube processing and manufacturing can not be through the capillary advance stretch reducer before increase high-pressure water dephosphorization system has got rid of the oxide layer on capillary surface, can't reduce the friction between sizing roller and the pipe, and can not prolong the life of sizing roller, can't guarantee the surface quality of finished product pipe, can't restrain capillary head wall thickness increase, be difficult to make the head thin, can't solve stretch and subtract back head bodiness problem, can't reduce head cutting length, be difficult to improve the yield, deformation is big when traditional cooling bed does not have the small-bore pipe of straightening function cooling, and the blowing difficulty when irregular tortuosity is big to cause the straightening is difficult, bad operation.
Therefore, a person skilled in the art provides a method for manufacturing a seamless tube, so as to solve the problems in the prior art.
Disclosure of Invention
The invention aims to provide a processing and manufacturing method of a seamless pipe, which aims to solve the problems that the traditional processing and manufacturing method of the seamless pipe provided in the background technology cannot remove an oxide layer on the surface of a capillary by adding a high-pressure water dephosphorization system before the capillary enters a straightening and reducing machine, cannot reduce friction between a sizing roller and the pipe, cannot prolong the service life of the sizing roller, cannot ensure the surface quality of a finished pipe, cannot inhibit the increase of the wall thickness of the head of the capillary, cannot thin the head, cannot solve the problem of thickening of the head after the straightening and reducing, cannot reduce the cutting length of the head, cannot improve the yield, and the conventional cooling bed has no straightening function, is large in deformation and large in irregular bending degree, so that the discharging is difficult in straightening and is not easy to operate.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the processing and manufacturing method of the seamless pipe comprises the following steps of:
s1, a tube blank heating step, namely cutting the tube blank according to the process length requirement, feeding the tube blank into a stepping furnace for heating, enabling the temperature to reach 1260-1280 ℃, pushing out the material by a pusher and conveying the material to a puncher, and then carrying out punching operation;
s2, in the perforation process, controlling the length of the ejector rod through an adjusting oil cylinder on the lock frame so as to adjust the ejection amount of the ejector head, so that the wall thickness of the perforation at the head part and the wall thickness of the perforation at the tail part are reduced, and the two-head wall thickness of the capillary tube is thinner than the middle wall thickness to achieve two-head sharpening;
s3, a secondary heating step, wherein the temperature of the perforated capillary tube is far lower than the temperature required by the stretch reducing process due to temperature reduction. The perforated capillary tube is sent into a secondary heating furnace, and the temperature of the capillary tube is increased to 900 plus or minus 50 degrees through the heat supplement of the secondary heating furnace;
s4, performing high-pressure water dephosphorization and tension reducing, namely oxidizing the surface of the capillary after secondary heating, removing a surface oxidation layer through high-pressure water dephosphorization, so that the surface of the capillary entering the tension reducing machine is bright, the surface quality of a finished pipe is ensured, the friction coefficient between a roller and the pipe of the tension reducing machine is reduced, the roller is protected, the service life of the roller is prolonged, and when the capillary entering the tension reducing machine is perforated, the two-end sharpening is adopted, so that the end-cutting and end-cutting losses caused by thickening of the two ends are greatly reduced;
s5, cooling, packing and warehousing, namely cooling through a roller cooling bed, straightening and detecting the flaw through straightening and detecting the flaw, wherein the stretched and reduced pierced billet enters the roller cooling bed, is cooled on the roller cooling bed and straightened, the cooled pipe is sent to a straightener, and the straightened pipe is cut into lengths, detected and packaged and warehoused.
As a preferred embodiment of the present invention: in the cooling, packing and warehousing steps, the wall thickness of the straightened small-caliber seamless pipe can reach 2.4mm, and the length can reach more than 12 m.
As a preferred embodiment of the present invention: in the tube blank perforation process, the distance between the centering roller frames is properly increased, and a group of centering roller frames are additionally arranged, so that the perforated capillary tube length is increased from 6 meters to 7-8 meters, and a foundation is laid for lengthening the finished tube length.
As a preferred embodiment of the present invention: in the high-pressure water dephosphorization and tension reducing step, a tension reducing mill is selected to replace an original sizing mill, the tension reducing process replaces the sizing process, the wall increase is restrained, the small wall increase, no wall increase and wall reduction operation are realized, and the wall thickness range of the thin-wall pipe is 2.4-3mm.
As a preferred embodiment of the present invention: in the secondary heating step, a secondary heating furnace is added between the perforating machine and the stretch reducing machine for supplementing heat, so that the temperature of a capillary tube can reach over 850 degrees when the capillary tube enters the stretch reducing machine, the requirement of stretch reducing rolling temperature is met, the capillary tube directly enters a sizing mill after perforation in the past, when the temperature is too low and sizing is carried out, the low-temperature rolling is actually carried out, the mechanical property of a finished product tube is poor, and after the secondary heating furnace is added, the capillary tube is heated to over 900 degrees, so that metal grains are thinned, and the mechanical property of the capillary tube are improved.
Compared with the prior art, the invention has the beneficial effects that:
according to the method for processing and manufacturing the seamless pipe, the high-pressure water dephosphorization system is added before the capillary pipe enters the stretch reducer to remove the oxide layer on the surface of the capillary pipe, so that friction between the sizing roller and the pipe is reduced, the service life of the sizing roller is prolonged, and the surface quality of a finished pipe is greatly improved. The finished pipe cooling bed adopts a roller cooling bed, the cooling bed is elaborately designed, the friction force generated by small included angles between rollers is skillfully utilized to drive the pipe to move forward, the included angles are utilized to control the trend of the pipe, and thus, the pipe is subjected to preliminary straightening while being cooled, and a foundation is laid for smooth secondary straightening. The improved portal frame device increases the top extension of the top head when the perforation starts and ends, so that the wall thickness of the head and the tail of the capillary is reduced, the problem of head thickening after the expansion is reduced, the head cutting length is reduced, and the yield is improved. The concrete method is that an oil cylinder device is added at the locking position of the portal frame, the wall thickness of the capillary is determined by the roll spacing, the guide distance and the forward extension of the ejection head during perforation, and the added oil cylinder device ejects when the capillary bites and is about to eject, which is equal to the increase of the ejection extension of the ejection head, so that the wall thickness of the perforation of the head and the tail is reduced properly. The production line adopts two perforating machines and uses one tension reducing machine, thereby improving the utilization rate of tension reducing machine equipment and saving investment.
Detailed Description
In the embodiment of the invention, a processing and manufacturing method of a seamless pipe comprises the following steps:
s1, a tube blank heating step, namely cutting the tube blank according to the process length requirement, feeding the tube blank into a stepping furnace for heating, enabling the temperature to reach 1260-1280 ℃, pushing out the material by a pusher and conveying the material to a puncher, and then carrying out punching operation;
s2, in the perforation process, controlling the length of the ejector rod through an adjusting oil cylinder on the lock frame so as to adjust the ejection amount of the ejector head, so that the wall thickness of the perforation at the head part and the wall thickness of the perforation at the tail part are reduced, and the two-head wall thickness of the capillary tube is thinner than the middle wall thickness to achieve two-head sharpening;
s3, a secondary heating step, wherein the temperature of the perforated capillary tube is far lower than the temperature required by the stretch reducing process due to temperature reduction. The perforated capillary tube is sent into a secondary heating furnace, and the temperature of the capillary tube is increased to 900 plus or minus 50 degrees through the heat supplement of the secondary heating furnace;
s4, performing high-pressure water dephosphorization and tension reducing, namely oxidizing the surface of the capillary after secondary heating, removing a surface oxidation layer through high-pressure water dephosphorization, so that the surface of the capillary entering the tension reducing machine is bright, the surface quality of a finished pipe is ensured, the friction coefficient between a roller and the pipe of the tension reducing machine is reduced, the roller is protected, the service life of the roller is prolonged, and when the capillary entering the tension reducing machine is perforated, the two-end sharpening is adopted, so that the end-cutting and end-cutting losses caused by thickening of the two ends are greatly reduced;
s5, cooling, packing and warehousing, namely cooling through a roller cooling bed, straightening and detecting the flaw through straightening and detecting the flaw, wherein the stretched and reduced pierced billet enters the roller cooling bed, is cooled on the roller cooling bed and straightened, the cooled pipe is sent to a straightener, and the straightened pipe is cut into lengths, detected and packaged and warehoused.
The high-pressure water dephosphorization system is added before the capillary tube enters the tension reducing machine, so that an oxide layer on the surface of the capillary tube is removed, friction between the sizing roller and the tube is reduced, the service life of the sizing roller is prolonged, and the surface quality of a finished product tube is greatly improved. The finished pipe cooling bed adopts a roller cooling bed, the cooling bed is elaborately designed, the friction force generated by small included angles between rollers is skillfully utilized to drive the pipe to move forward, the included angles are utilized to control the trend of the pipe, and thus, the pipe is subjected to preliminary straightening while being cooled, and a foundation is laid for smooth secondary straightening.
In the cooling, packing and warehousing steps, the wall thickness of the straightened small-caliber seamless pipe can reach 2.4mm, and the length can reach more than 12 m. In the tube blank perforation process, the interval between the centering roller frames is properly increased, and a group of centering roller frames are additionally arranged, so that the perforated capillary tube length is increased from 6 meters to 7-8 meters, and a foundation is laid for lengthening the finished tube length. In the high-pressure water dephosphorization and tension reducing step, a tension reducing mill is selected to replace an original sizing mill, the tension reducing process replaces the sizing process, the wall increase is restrained, the small wall increase, no wall increase and wall reduction operation are realized, and the wall thickness range of the thin-wall pipe is 2.4-3mm. In the secondary heating step, a secondary heating furnace is added between the perforating machine and the stretch reducing machine for supplementing heat, so that the temperature of a capillary tube can reach over 850 degrees when the capillary tube enters the stretch reducing machine, the requirement of the stretch reducing rolling temperature is met, the capillary tube directly enters a sizing mill after the perforation is carried out in the past, the actual low-temperature rolling is carried out when the temperature is too low for sizing, the mechanical property of a finished product tube is poor, and the capillary tube is heated to over 900 degrees after the secondary heating furnace is added, so that metal grains are thinned, and the mechanical property of the capillary tube are improved.
The portal frame device is improved, the increase of the head and tail wall thickness during the expansion and the reduction of the pierced billet is effectively restrained, the head and tail parts are thinned, the problem of head and tail thickening after the expansion and the reduction is solved, the head and tail cutting length is reduced, and the yield is improved. The concrete method is that an oil cylinder device is added at the locking position of the portal frame, the wall thickness of the capillary is determined by the roll spacing, the guide distance and the forward extension of the ejection head during perforation, and the added oil cylinder device ejects the capillary when the capillary bites a person and is about to eject, which is equal to the increase of the ejection extension of the ejection head, so that the wall thickness of the perforation of the head and the tail is reduced properly. The production line adopts two perforating machines and uses one tension reducing machine, thereby improving the utilization rate of tension reducing machine equipment and saving investment.
The working principle of the invention is as follows: the processing and manufacturing method of the seamless pipe comprises the following steps:
s1, a tube blank heating step, namely cutting the tube blank according to the process length requirement, feeding the tube blank into a stepping furnace for heating, enabling the temperature to reach 1260-1280 ℃, pushing out the material by a pusher and conveying the material to a puncher, and then carrying out punching operation; in the tube blank perforation process, the interval between the centering roller frames is properly increased, and a group of centering roller frames are additionally arranged, so that the perforated capillary tube length is increased from 6 meters to 7-8 meters, and a foundation is laid for lengthening the finished tube length.
S2, in the perforation process, controlling the length of the ejector rod through an adjusting oil cylinder on the lock frame so as to adjust the ejection and extension amount of the ejector head, and realizing that the thickness of two ends of the capillary is thinner than the thickness of the middle wall so as to achieve two-end sharpening;
s3, a secondary heating step, wherein the temperature of the perforated capillary tube is far lower than the temperature required by the stretch reducing process due to temperature reduction. The perforated capillary tube is sent into a secondary heating furnace, and the temperature of the capillary tube is increased to 900 plus or minus 50 degrees through the heat supplement of the secondary heating furnace; in the secondary heating step, a secondary heating furnace is added between the perforating machine and the stretch reducing machine for supplementing heat, so that the temperature of a capillary tube can reach over 850 degrees when the capillary tube enters the stretch reducing machine, the requirement of the stretch reducing rolling temperature is met, the capillary tube directly enters a sizing mill after the perforation is carried out in the past, the actual low-temperature rolling is carried out when the temperature is too low for sizing, the mechanical property of a finished product tube is poor, and the capillary tube is heated to over 900 degrees after the secondary heating furnace is added, so that metal grains are thinned, and the mechanical property of the capillary tube are improved.
S4, performing high-pressure water dephosphorization and tension reducing, namely oxidizing the surface of the capillary after secondary heating, removing a surface oxidation layer through high-pressure water dephosphorization, so that the surface of the capillary entering the tension reducing machine is bright, the surface quality of a finished pipe is ensured, the friction coefficient between a roller and the pipe of the tension reducing machine is reduced, the roller is protected, the service life of the roller is prolonged, and when the capillary entering the tension reducing machine is perforated, the two-end sharpening is adopted, so that the end-cutting and end-cutting losses caused by thickening of the two ends are greatly reduced; in the high-pressure water dephosphorization and tension reducing step, a tension reducing mill is selected to replace an original sizing mill, the tension reducing process replaces the sizing process, the wall increase is restrained, the small wall increase, no wall increase and wall reduction operation are realized, and the wall thickness range of the thin-wall pipe is 2.4-3mm.
S5, cooling, packing and warehousing, namely cooling through a roller cooling bed, straightening and detecting the flaw through straightening and detecting the flaw, wherein the stretched and reduced pierced billet enters the roller cooling bed, is cooled on the roller cooling bed and straightened, the cooled pipe is sent to a straightener, and the straightened pipe is cut into lengths, detected and packaged and warehoused. In the cooling, packing and warehousing steps, the wall thickness of the straightened small-caliber seamless pipe can reach 2.4mm, and the length can reach more than 12 m.
The high-pressure water dephosphorization system is added before the capillary tube enters the tension reducing machine, so that an oxide layer on the surface of the capillary tube is removed, friction between the sizing roller and the tube is reduced, the service life of the sizing roller is prolonged, and the surface quality of a finished product tube is greatly improved. The finished pipe cooling bed adopts a roller cooling bed, the cooling bed is elaborately designed, the friction force generated by small included angles between rollers is skillfully utilized to drive the pipe to move forward, the included angles are utilized to control the trend of the pipe, and thus, the pipe is subjected to preliminary straightening while being cooled, and a foundation is laid for smooth secondary straightening. The portal frame device is improved, the wall thickness increase of the head and the tail is effectively restrained, the wall thickness of the head and the tail is thinned, the wall thickness increase of the head and the tail after the expansion and the reduction is weakened, the head and the tail cutting length is reduced, and the yield is improved. The concrete method is that an oil cylinder device is added at the locking position of the portal frame, the wall thickness of the capillary is determined by the roll spacing, the guide distance and the forward extension of the ejection head during perforation, and the added oil cylinder device ejects out when the capillary bites a person and ejects the capillary, which is equal to the increase of the ejection extension of the ejection head, so that the wall thickness of the perforation of the head and the tail is reduced properly. The production line adopts two perforating machines and uses one tension reducing machine, thereby improving the utilization rate of tension reducing machine equipment and saving investment.
The foregoing description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical solution of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (5)
1. The processing and manufacturing method of the seamless pipe is characterized by comprising the following steps of:
s1, a tube blank heating step, namely cutting the tube blank according to the process length requirement, feeding the tube blank into a stepping furnace for heating, enabling the temperature to reach 1260-1280 ℃, pushing out the material by a pusher and conveying the material to a puncher, and then carrying out punching operation;
s2, in the perforation process, controlling the length of the ejector rod through an adjusting oil cylinder on the lock frame so as to adjust the ejection amount of the ejector head, so that the wall thickness of the perforation at the head part and the wall thickness of the perforation at the tail part are reduced, and the two-head wall thickness of the capillary tube is thinner than the middle wall thickness to achieve two-head sharpening;
s3, a secondary heating step, wherein the temperature of the perforated capillary tube is far lower than the temperature required by the stretch reducing process due to temperature reduction. The perforated capillary tube is sent into a secondary heating furnace, and the temperature of the capillary tube is increased to 900 plus or minus 50 degrees through the heat supplement of the secondary heating furnace;
s4, performing high-pressure water dephosphorization and tension reducing, namely oxidizing the surface of the capillary after secondary heating, removing a surface oxidation layer through high-pressure water dephosphorization, so that the surface of the capillary entering the tension reducing machine is bright, the surface quality of a finished pipe is ensured, the friction coefficient between a roller and the pipe of the tension reducing machine is reduced, the roller is protected, the service life of the roller is prolonged, and when the capillary entering the tension reducing machine is perforated, the two-end sharpening is adopted, so that the end-cutting and end-cutting losses caused by thickening of the two ends are greatly reduced;
s5, cooling, packing and warehousing, namely cooling through a roller cooling bed, straightening and detecting the flaw through straightening and detecting the flaw, wherein the stretched and reduced pierced billet enters the roller cooling bed, is cooled on the roller cooling bed and straightened, the cooled pipe is sent to a straightener, and the straightened pipe is cut into lengths, detected and packaged and warehoused.
2. The method for manufacturing the seamless pipe according to claim 1, wherein in the cooling, packing and warehousing step, the wall thickness of the straightened pipe with small caliber can reach 2.4mm, and the length can reach more than 12 m.
3. The method for manufacturing the seamless tube according to claim 1, wherein in the tube blank perforation process, the distance between the centering roller frames is properly increased, and a group of centering roller frames are additionally arranged, so that the perforated capillary tube length is increased from 6 meters to 7-8 meters, and a foundation is laid for lengthening the finished tube length.
4. The method for manufacturing the seamless pipe according to claim 1, wherein in the high-pressure water dephosphorization and tension reducing step, a tension reducing mill is selected to replace an original sizing mill, a sizing process is replaced by a tension reducing process, wall increase is restrained, small wall increase, no wall increase and wall reduction operations are realized, and the minimum wall thickness of the thin-wall pipe can reach 2.4mm.
5. The method for manufacturing the seamless pipe according to claim 1, wherein in the secondary heating step, a secondary heating furnace is added between the perforating machine and the stretch reducing machine for supplementing heat, so that the temperature of the blank pipe can reach above 850 ℃ when the blank pipe is fed into the stretch reducing machine, the requirement of stretch reducing rolling temperature is met, the blank pipe is directly fed into a sizing mill after the perforation is finished in the past, the blank pipe is actually rolled at a low temperature when the temperature is too low for sizing, the mechanical property of the finished pipe is poor, and after the secondary heating furnace is added, the blank pipe is heated to above 900 ℃, metal grains are thinned, and the mechanical property of the blank pipe are improved.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310752058.0A CN116689480A (en) | 2023-06-25 | 2023-06-25 | Processing and manufacturing method of seamless pipe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310752058.0A CN116689480A (en) | 2023-06-25 | 2023-06-25 | Processing and manufacturing method of seamless pipe |
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| Publication Number | Publication Date |
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| CN116689480A true CN116689480A (en) | 2023-09-05 |
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| CN202310752058.0A Pending CN116689480A (en) | 2023-06-25 | 2023-06-25 | Processing and manufacturing method of seamless pipe |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116890033A (en) * | 2023-09-11 | 2023-10-17 | 江苏常宝钢管股份有限公司 | Preparation method of pipe |
-
2023
- 2023-06-25 CN CN202310752058.0A patent/CN116689480A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116890033A (en) * | 2023-09-11 | 2023-10-17 | 江苏常宝钢管股份有限公司 | Preparation method of pipe |
| CN116890033B (en) * | 2023-09-11 | 2023-12-19 | 江苏常宝钢管股份有限公司 | Preparation method of pipe |
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