CN115178964A - Surface fine crack eliminating process and processing equipment for stainless steel seamless steel pipe - Google Patents
Surface fine crack eliminating process and processing equipment for stainless steel seamless steel pipe Download PDFInfo
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- CN115178964A CN115178964A CN202210890334.5A CN202210890334A CN115178964A CN 115178964 A CN115178964 A CN 115178964A CN 202210890334 A CN202210890334 A CN 202210890334A CN 115178964 A CN115178964 A CN 115178964A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 225
- 239000010959 steel Substances 0.000 title claims abstract description 225
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 153
- 239000010935 stainless steel Substances 0.000 title claims abstract description 153
- 238000000034 method Methods 0.000 title claims abstract description 26
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 102
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 102
- 239000007788 liquid Substances 0.000 claims abstract description 102
- 238000007790 scraping Methods 0.000 claims abstract description 50
- 230000001680 brushing effect Effects 0.000 claims abstract description 37
- 230000006698 induction Effects 0.000 claims abstract description 24
- 238000001816 cooling Methods 0.000 claims abstract description 8
- 238000000227 grinding Methods 0.000 claims abstract description 6
- 238000007789 sealing Methods 0.000 claims abstract description 6
- 238000004140 cleaning Methods 0.000 claims abstract description 4
- 238000005498 polishing Methods 0.000 claims abstract description 4
- 230000008030 elimination Effects 0.000 claims abstract description 3
- 238000003379 elimination reaction Methods 0.000 claims abstract description 3
- 230000007246 mechanism Effects 0.000 claims description 60
- 238000010438 heat treatment Methods 0.000 claims description 42
- 230000005294 ferromagnetic effect Effects 0.000 claims description 13
- 239000002245 particle Substances 0.000 claims description 13
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- 239000002253 acid Substances 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- 239000004411 aluminium Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 description 5
- 230000000149 penetrating effect Effects 0.000 description 3
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007779 soft material Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P6/00—Restoring or reconditioning objects
- B23P6/04—Repairing fractures or cracked metal parts or products, e.g. castings
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Abstract
The invention discloses a process for eliminating fine cracks on the surface of a stainless steel seamless steel pipe, which comprises the following steps of firstly, cleaning the stainless steel seamless steel pipe; secondly, preheating the stainless steel seamless steel tube, sealing two ends of the stainless steel seamless steel tube and then sending the stainless steel seamless steel tube into a constant-temperature aluminum liquid pool; placing the stainless steel seamless steel tube in an aluminum liquid pool and repeatedly scraping and brushing the surface of the stainless steel seamless steel tube; step four, slowly lifting the stainless steel seamless steel tube from the molten aluminum pool, and continuously and repeatedly scraping and brushing the surface of the stainless steel seamless steel tube; fifthly, moving the stainless steel seamless steel tube out of the aluminum liquid pool and then sending the stainless steel seamless steel tube into an induction furnace; and sixthly, outputting, cooling, grinding and polishing the stainless steel seamless steel pipe to finish the elimination of the fine cracks, and providing a matched device to realize mechanization and automation of the process.
Description
Technical Field
The invention relates to a process for eliminating fine cracks on the surface of a stainless steel seamless steel pipe and processing equipment thereof.
Background
In the prior art, the fine cracks are usually generated on the surface of the steel pipe due to various reasons in the production process of the stainless steel seamless steel pipe, the surface of the steel pipe is generally ground and grinded, and the grinding and grinding depth needs to reach more than 1mm according to the international standard, so that the outer diameter and the wall thickness of the stainless steel seamless steel pipe are undoubtedly reduced, the stainless steel seamless steel pipe becomes a non-standard product or a defective product, and the loss of a stainless steel seamless steel pipe producer is huge.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a process and equipment for eliminating fine cracks on the surface of a stainless steel seamless steel pipe, wherein the process and the equipment do not obviously influence the outer diameter, the wall thickness and the performance of the steel pipe, and can effectively improve the efficiency of repairing and eliminating the fine cracks.
The technical scheme of the invention is as follows: a process for eliminating fine cracks on the surface of a stainless steel seamless steel pipe comprises the following steps:
step one, carrying out acid washing, cleaning and drying on the stainless steel seamless steel pipe to clean oil stains and impurities on the surface of the stainless steel seamless steel pipe and in the fine cracks;
step two, heating the cleaned stainless steel seamless steel pipe to 670-900 ℃, sealing two ends of the stainless steel seamless steel pipe, and then sending the heated stainless steel seamless steel pipe into a constant-temperature aluminum liquid pool;
thirdly, placing the stainless steel seamless steel tube in an aluminum liquid pool for 10-60 seconds, wherein the surface of the stainless steel seamless steel tube is repeatedly scraped and brushed by using a tool during the period, so that the aluminum liquid mixed with ferromagnetic particles fully enters the hairline cracks on the surface of the stainless steel seamless steel tube;
step four, slowly lifting the stainless steel seamless steel tube from the aluminum liquid pool at the speed of 1-4 cm/s, continuously and repeatedly scraping and brushing the surface of the stainless steel seamless steel tube by using tools during the lifting period so as to scrape redundant aluminum liquid, enabling the aluminum liquid to be distributed in cracks of the stainless steel seamless steel tube as uniformly as possible, and enabling the scraped redundant aluminum liquid to fall back into the aluminum liquid pool;
fifthly, moving the stainless steel seamless steel pipe out of the molten aluminum pool, cooling the stainless steel seamless steel pipe to below 660 ℃, and sending the stainless steel seamless steel pipe into an induction furnace; the stainless steel seamless steel pipe passes through the inside of an induction furnace in a slow rotation mode, and the heating temperature of the induction furnace is 660 ℃;
and step six, after the stainless steel seamless steel pipe is output from the induction electric furnace, naturally cooling the induction electric furnace, and then grinding and polishing the induction electric furnace to finish the elimination of the fine cracks.
Specifically, an aluminum liquid mixed with ferromagnetic particles is arranged in the aluminum liquid pool, and the ratio of the aluminum liquid to the ferromagnetic particles is 1000: 1-500, and keeping the aluminum liquid in the aluminum liquid pool at a constant temperature of 670-900 ℃.
Preferably, steps two, three, four and five are all carried out in a vacuum environment.
A processing device applied to eliminating fine cracks on the surface of a stainless steel seamless steel pipe comprises a first heating device arranged at the inlet end of a vacuum chamber, a second heating device arranged at the outlet end of the vacuum chamber, a constant-temperature aluminum liquid pool arranged in the vacuum chamber and a steel pipe moving mechanism arranged above the constant-temperature aluminum liquid pool, wherein a steel pipe scraping and brushing mechanism is further arranged on the steel pipe moving mechanism;
the steel pipe moving mechanism comprises a guide rail fixed at the upper end in the vacuum chamber, a first trolley movably connected to the guide rail, two first telescopic mechanisms respectively connected to two ends of the first trolley in a left-right moving mode, and two clamping arms respectively fixed to telescopic rods of the first telescopic mechanisms, wherein end parts of the two clamping arms are respectively fixed with a plug, the plugs are used for inserting end parts of the stainless steel seamless steel pipe to seal the stainless steel seamless steel pipe, and the clamping arms are used for clamping two ends of the stainless steel seamless steel pipe;
the plug comprises a main body and a circular truncated cone-shaped lug which is convexly arranged at one end of the main body, the main body is fixed at the lower end of the clamping arm, one end of the lug, which is close to the main body, is also fixedly provided with a circle of copper ring, and the copper ring is made of a softer material and is used for sealing the end part of the stainless steel seamless steel tube so as to prevent aluminum liquid from entering the stainless steel seamless steel tube and being inconvenient to clean; the joint of the convex block and the main body is also provided with a circle of concave rings, the main body is also provided with a diversion trench which is communicated with the concave rings and the bottom of the main body, and the concave rings and the diversion trench are arranged for rapidly leading out the aluminum liquid accumulated between the end part of the stainless steel seamless steel pipe and the plug so as to avoid the aluminum liquid from being solidified between the plug and the stainless steel seamless steel pipe and leading the stainless steel seamless steel pipe to be difficult to fall off from the plug;
the scraping and brushing mechanism consists of a support and a scraping and brushing head, an inner rail is arranged in the middle of the first trolley, a second trolley is movably connected to the first trolley, a second telescopic mechanism is further arranged on the second trolley, the support is positioned below the first trolley and is connected with a telescopic rod of the second telescopic mechanism, and the scraping and brushing head is fixed at the bottom of the support and is coaxially arranged with the two plugs;
the middle part of the scraping and brushing head is provided with a through hole, two ends in the through hole are respectively provided with a convex ring which is obliquely arranged towards two ends of the through hole, the inner diameter of each convex ring corresponds to the outer diameter of a stainless steel seamless steel pipe to be processed, the section of each convex ring is an oblique triangle with an arc-shaped top, and the convex rings are abutted with the outer wall of the steel pipe to scrape and brush the outer wall of the stainless steel seamless steel pipe; the lower end of the scraping brush head is also provided with a plurality of deep grooves penetrating through the through holes, and the deep grooves are used for discharging the scraped aluminum liquid in time to prevent the aluminum liquid from being solidified in the scraping brush head.
Preferably, the first heating device and the second heating device are both high-frequency heating furnaces.
Preferably, the first telescopic mechanism and the second telescopic mechanism are both electric cylinders, the guide rail is a double-rail guide rail, the first trolley is movably connected in the double-rail guide rail, the two ends of the first trolley are also provided with the electric cylinders for driving the first telescopic mechanism to move, the top of the first trolley is also provided with a long groove communicated with the inner rail, and the upper end of the second telescopic mechanism extends out of the long groove to ensure the normal operation of each mechanism of the trolley.
Preferably, the outlet end of the first heating device and the inlet end of the second heating device are respectively provided with a first steel pipe bracket, the same side of the two first steel pipe brackets is respectively provided with a second steel pipe bracket, the first steel pipe bracket on one side of the first heating device and the second steel pipe bracket of the second heating device are respectively provided with a pipe turning mechanism so as to transfer the stainless steel seamless steel pipe to the other steel pipe bracket, the first steel pipe bracket of the second heating device is also provided with a steel pipe conveying roller, the steel pipe conveying roller is divided into a transverse conveying roller and an oblique conveying roller so as to convey the steel pipe into the second heating device in a rotating manner, the guide rail is positioned right above the two second steel pipe brackets, and the constant-temperature aluminum liquid pool is positioned between the two second steel pipe brackets so that the first trolley can clamp the stainless steel seamless steel pipe to perform the operation of each step.
Preferably, the outer surfaces of the clamping arm, the plug bracket and the scraping brush head are mirror surfaces so as to reduce the adhesion of aluminum liquid as much as possible.
Preferably, a plurality of guide rods are further arranged between the support and the second trolley, and guide holes corresponding to the guide rods are formed in the support, so that the support and the scraping brush head can run more stably.
Preferably, two pairs of convex rings are arranged in the through hole of the scraping brush head, a liquid discharge groove is formed between every two convex rings, and each liquid discharge groove is communicated with the corresponding deep groove.
The invention has the beneficial effects that:
1. the method adopts the technical means and equipment for repairing and eliminating the crazes on the surface of the stainless steel seamless steel pipe, does not need to deeply polish the stainless steel seamless steel pipe, does not generate obvious influence on the pipe diameter and the wall thickness of the stainless steel seamless steel pipe, has high repairing efficiency because the repairing and eliminating process temperature is relatively low and the process is relatively simple and convenient, and does not influence the performance of the stainless steel seamless steel pipe;
2. the preheated stainless steel seamless steel pipe is immersed in a constant-temperature aluminum liquid pool, so that the surface of the stainless steel seamless steel pipe can be prevented from condensing an aluminum film due to temperature difference, the speed of the aluminum liquid permeating into the hairline of the stainless steel seamless steel pipe can be increased, the processing efficiency is improved, and the adhesion strength of the aluminum liquid in the hairline of the stainless steel seamless steel pipe is improved;
3. through matched processing equipment, the stainless steel seamless steel tube immersed in the constant-temperature aluminum liquid pool is repeatedly scraped and brushed on the surface by the scraping and brushing head, so that the fine cracks on the surface of the stainless steel seamless steel tube can be ensured to be uniformly permeated with aluminum liquid, and the uniformity of the distribution of the aluminum liquid in the fine cracks is ensured, so that the final effect of repairing and eliminating the fine cracks is improved;
4. the stainless steel seamless steel tube is lifted slowly from the aluminum liquid pool, and the scraping and brushing head continues to scrape and brush the surface of the stainless steel seamless steel tube, so that the aluminum liquid attached in the hairline of the stainless steel seamless steel tube has a solidification process, and the surface of the stainless steel seamless steel tube is continuously and repeatedly scraped and brushed to scrape redundant aluminum liquid, and further the aluminum liquid is ensured to be uniformly distributed in the hairline;
5. the aluminum liquid is also mixed with a proper amount of ferromagnetic particles, the stainless steel seamless steel tube passes through the inside of the induction furnace in a slow rotation mode, and the effect similar to induction electric welding is achieved under the action of the induction furnace, so that the aluminum liquid in the cracks is combined with the cracks more stably;
6. and a matched processing device is also provided, so that the process can be mechanically and automatically operated.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a plan view of the steel pipe moving mechanism of the present invention;
FIG. 3 is a schematic structural view of a steel pipe moving mechanism and a steel pipe scraping and brushing mechanism according to the present invention;
FIG. 4 is a schematic view of the plug of the present invention;
FIG. 5 is a cross-sectional view of a bulkhead of the invention;
FIG. 6 is a schematic view of the construction of the squeegee head of the invention;
fig. 7 is a cross-sectional view of a squeegee head of the invention.
In the figure: the device comprises a vacuum chamber 1, a first heating device 2, a second heating device 3, a constant-temperature aluminum liquid pool 4, a steel pipe moving mechanism 5, a steel pipe scraping and brushing mechanism 6, a guide rail 7, a first trolley 8, a first telescopic mechanism 9, a clamping arm 10, a plug 11, a main body 12, a convex block 13, a copper ring 14, a concave ring 15, a flow guide groove 16, a support 17, a scraping and brushing head 18, a second trolley 19, a second telescopic mechanism 20, a through hole 21, a convex ring 22, a deep groove 23, a long groove 24, a first steel pipe bracket 25, a second steel pipe bracket 26, a pipe overturning mechanism 27, a steel pipe conveying roller 28, a guide rod 29 and a liquid discharge groove 30.
Detailed Description
The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.
A process for eliminating fine cracks on the surface of a stainless steel seamless steel pipe comprises the following steps:
the method comprises the following steps of firstly, carrying out acid washing, cleaning and drying on the stainless steel seamless steel pipe to clean oil stains and impurities on the surface of the stainless steel seamless steel pipe and in fine cracks;
step two, heating the cleaned stainless steel seamless steel tube to 670-900 ℃, sealing two ends of the stainless steel seamless steel tube, and then sending the heated stainless steel seamless steel tube into a constant-temperature aluminum liquid pool;
in the above steps, an aluminum liquid mixed with ferromagnetic particles is arranged in the aluminum liquid pool, and the ratio of the aluminum liquid to the ferromagnetic particles is 1000: 1-500, too much or too little ferromagnetic particles can influence the later crack repairing effect;
keeping the aluminum liquid in the aluminum liquid pool at a constant temperature of 670-900 ℃ so as to keep the aluminum liquid in a liquid state;
the stainless steel seamless steel pipe is preheated, and the main purpose is to avoid that a layer of solidified aluminum film is formed on the surface of the stainless steel seamless steel pipe when the stainless steel seamless steel pipe with lower temperature enters an aluminum liquid pool, which is not beneficial to the aluminum liquid to enter fine cracks on the surface of the stainless steel seamless steel pipe;
thirdly, placing the stainless steel seamless steel tube in an aluminum liquid pool for 10-60 seconds, wherein the surface of the stainless steel seamless steel tube is repeatedly scraped and brushed by using a tool during the period, so that the aluminum liquid mixed with ferromagnetic particles fully enters the hairline cracks on the surface of the stainless steel seamless steel tube;
step four, slowly lifting the stainless steel seamless steel tube from the aluminum liquid pool at the speed of 1-4 cm/s, continuously and repeatedly scraping and brushing the surface of the stainless steel seamless steel tube by using a tool during the lifting period, wherein the aluminum liquid attached in the cracks of the stainless steel seamless steel tube can have a solidification process in the slow lifting process, and continuously and repeatedly scraping and brushing the surface of the stainless steel seamless steel tube to scrape redundant aluminum liquid, so that the aluminum liquid is uniformly distributed in the cracks of the stainless steel seamless steel tube as much as possible, and the scraped redundant aluminum liquid falls back into the aluminum liquid pool;
fifthly, moving the stainless steel seamless steel pipe out of the aluminum liquid pool, cooling the stainless steel seamless steel pipe to below 660 ℃, solidifying the aluminum liquid in the cracks, and then sending the solidified aluminum liquid into an induction furnace; the stainless steel seamless steel tube passes through the inside of the induction electric furnace in a slow rotation mode, and the movement mode can ensure that the stainless steel seamless steel tube is heated more uniformly and can also prevent aluminum liquid from falling off from cracks under the action of self weight after being heated;
in the process, because the ferromagnetic particles are mixed in the aluminum liquid in the cracks of the stainless steel seamless steel tube, the effect similar to induction electric welding is achieved under the action of the induction electric furnace, so that the aluminum liquid in the cracks and the cracks are combined more stably;
in the steps, the induction furnace heats the surface of the stainless steel seamless steel pipe and the aluminum liquid in the surface cracks of the stainless steel seamless steel pipe to 660 ℃ so as to enable the aluminum liquid to be in a semi-solid state and achieve a better repairing effect;
the ferromagnetic particles mixed in the aluminum liquid also improve the strength of the aluminum liquid after cooling to a certain extent;
step six, after the stainless steel seamless steel pipe is output to an induction electric furnace, naturally cooling the induction electric furnace, and then grinding and polishing the induction electric furnace to eliminate fine cracks;
it should be noted that the second, third, fourth and fifth steps are performed in a vacuum environment to prevent the stainless steel seamless steel tube and the aluminum liquid from being oxidized in a high temperature environment.
As shown in fig. 1, the equipment for eliminating and processing the fine cracks on the surface of the stainless steel seamless steel tube comprises a first heating device 2 arranged at the inlet end of a vacuum chamber 1, a second heating device 3 arranged at the outlet end of the vacuum chamber 1, a constant-temperature aluminum liquid pool 4 arranged in the vacuum chamber 1, and a steel tube moving mechanism 5 arranged above the constant-temperature aluminum liquid pool 4, wherein a steel tube scraping and brushing mechanism 6 is further arranged on the steel tube moving mechanism 5;
referring to fig. 2 and 3, the steel tube moving mechanism 5 includes a guide rail 7 fixed at the upper end in the vacuum chamber 1, a first trolley 8 movably connected to the guide rail 7, two first telescoping mechanisms 9 respectively moving left and right and connected to two ends of the first trolley 8, and two clamping arms 10 respectively fixed to telescoping rods of the first telescoping mechanisms 9, wherein end parts of the two clamping arms 10 are respectively fixed with a plug 11, the plugs 11 are used for inserting end parts of stainless steel seamless steel tubes to seal the stainless steel seamless steel tubes, and are used for clamping two ends of the stainless steel seamless steel tubes by the clamping arms 10;
as shown in fig. 4 and 5, the plug 11 is composed of a main body 12 and a truncated cone-shaped projection 13 protruding from one end of the main body 12, the main body 12 is fixed at the lower end of the clamping arm 10, a circle of copper ring 14 is further fixed at one end of the projection 13 close to the main body 12, and the copper ring 14 is made of a soft material and is used for sealing the end of the stainless steel seamless steel tube, so that aluminum liquid is prevented from entering the stainless steel seamless steel tube and is not convenient to clean; a circle of concave ring 15 is further arranged at the joint of the convex block 13 and the main body 12, a flow guide groove 16 penetrating through the concave ring 15 and the bottom of the main body 12 is further arranged on the main body 12, and the concave ring 15 and the flow guide groove 16 are arranged for quickly guiding out aluminum liquid accumulated between the end part of the stainless steel seamless steel pipe and the plug 11 so as to avoid solidification between the plug 11 and the stainless steel seamless steel pipe and prevent the stainless steel seamless steel pipe from falling off from the plug 11;
referring to fig. 2 and 3, the steel pipe scraping and brushing mechanism 6 comprises a support 17 and a scraping and brushing head 18, an inner rail is arranged in the middle of the first trolley 8, a second trolley 19 is movably connected to the first trolley 8, a second telescopic mechanism 20 is further arranged on the second trolley 19, the support 17 is positioned below the first trolley 8 and connected with a telescopic rod of the second telescopic mechanism 20, and the scraping and brushing head 18 is fixed at the bottom of the support 17 and coaxially arranged with the two plugs 11;
as shown in fig. 6 and 7, a through hole 21 is formed in the middle of the scraping brush head 18, protruding rings 22 which are respectively arranged to be inclined towards two ends of the through hole 21 are respectively arranged at two ends in the through hole 21, the inner diameter of each protruding ring 22 corresponds to the outer diameter of a stainless steel seamless steel pipe to be processed, the cross section of each protruding ring 22 is an inclined triangle with an arc-shaped top, and the protruding rings 22 abut against the outer wall of the steel pipe to scrape the outer wall of the stainless steel seamless steel pipe; the lower end of the scraping brush head 18 is also provided with a plurality of deep grooves 23 penetrating through the through holes 21, and the deep grooves 23 are used for discharging the scraped aluminum liquid in time to prevent the aluminum liquid from being solidified in the scraping brush head 18.
The working principle of the structure is as follows: the stainless steel seamless steel pipe is heated by the first heating device 2 and waits for the next working procedure in the vacuum chamber 1; the first trolley 8 translates along the guide rail 7 to drive the two clamping arms 10 and the steel pipe scraping and brushing mechanism 6 to displace; when the stainless steel seamless steel tube is moved to one end, the steel tube scraping and brushing mechanism 6 descends firstly, so that the scraping and brushing head 18 is sleeved on the stainless steel seamless steel tube, the first trolley 8 moves forwards continuously until the stainless steel seamless steel tube is positioned at two ends of the stainless steel seamless steel tube, at the moment, the two clamping arms 10 move downwards and move towards the middle of the trolley, so that the two plugs 11 are respectively inserted into two ends of the stainless steel seamless steel tube, and the stainless steel seamless steel tube is clamped; then the first trolley 8 moves to the position above the constant-temperature aluminum liquid pool 4 along the guide rail 7, the two clamping arms 10 and the steel pipe scraping and brushing mechanism 6 continue to descend simultaneously, and the stainless steel seamless steel pipe is immersed in aluminum liquid in the constant-temperature aluminum liquid pool 4; after the stainless steel seamless steel tube is immersed, the second trolley 19 drives the steel tube scraping and brushing mechanism 6 to reciprocate along the axial direction of the stainless steel seamless steel tube, and the scraping and brushing head 18 of the steel tube scraping and brushing mechanism 6 carries out reciprocating scraping and brushing on the outer wall of the stainless steel seamless steel tube; after the scraping and brushing are finished, the clamping arm 10 and the steel pipe scraping and brushing mechanism 6 are lifted simultaneously to lift the stainless steel seamless steel pipe and move the stainless steel seamless steel pipe out of the constant-temperature aluminum liquid pool 4, and in the lifting process, the steel pipe scraping and brushing mechanism 6 continuously scrapes and brushes the stainless steel seamless steel pipe; after the stainless steel seamless steel pipe is moved out of the constant temperature molten aluminum bath 4, the trolley, the steel pipe scraping and brushing mechanism 6 and the clamping arm 10 reversely carry out the action of clamping the stainless steel seamless steel pipe, the stainless steel seamless steel pipe is put down, and the stainless steel seamless steel pipe enters the second heating device 3 to be heated and then is output to the vacuum chamber 1.
Specifically, the first heating device 2 and the second heating device 3 are both high-frequency heating furnaces;
specifically, as shown in fig. 2 and 3, the first telescoping mechanism 9 and the second telescoping mechanism 20 are both electric cylinders, the guide rail 7 is a double-track guide rail, the first trolley 8 is movably connected in the double-track guide rail, the electric cylinders for driving the first telescoping mechanism 9 to move are further disposed at two ends of the first trolley 8, a long groove 24 running through the inner track is further disposed at the top of the first trolley 8, and the long groove 24 extends from the upper end of the second telescoping mechanism 20 to ensure normal operation of each mechanism of the trolley;
in another embodiment, as shown in fig. 1, a first steel pipe bracket 25 is respectively disposed at the outlet end of the first heating device 2 and the inlet end of the second heating device 3, a second steel pipe bracket 26 is respectively disposed at the same side of the two first steel pipe brackets 25, a pipe turning mechanism 27 is respectively disposed at the first steel pipe bracket 25 at one side of the first heating device 2 and the second steel pipe bracket 26 of the second heating device 3 for transferring the stainless steel seamless steel pipe to the other steel pipe bracket, a steel pipe conveying roller 28 is further disposed at the first steel pipe bracket 25 of the second heating device 3, the steel pipe conveying roller 28 is divided into a transverse conveying roller and an oblique conveying roller for rotatably conveying the steel pipe into the second heating device 3, the guide rail 7 is located right above the two second steel pipe brackets 26, and the constant temperature aluminum liquid bath 4 is located between the two second steel pipe brackets 26, so that the first trolley 8 can clamp the stainless steel seamless steel pipe for performing the operation of each step;
in another embodiment, the outer surfaces of the clamping arm 10, the plug 11, the bracket 17 and the scraping head 18 are all mirror surfaces so as to reduce the adhesion of aluminum liquid as much as possible;
in another embodiment, as shown in fig. 3, a plurality of guide rods 29 are further arranged between the support 17 and the second trolley 19, and the support 17 is provided with guide holes corresponding to the guide rods 29, so that the support 17 and the wiping head 18 can run more smoothly;
in another embodiment, two pairs of convex rings 22 are arranged in the through hole 21 of the scraping head 18, a liquid discharge groove 30 is formed between every two convex rings 22, and each liquid discharge groove 30 is communicated with the corresponding deep groove 23.
Claims (10)
1. A process for eliminating fine cracks on the surface of a stainless steel seamless steel pipe is characterized by comprising the following steps:
the method comprises the following steps of firstly, carrying out acid washing, cleaning and drying on the stainless steel seamless steel pipe to clean oil stains and impurities on the surface of the stainless steel seamless steel pipe and in fine cracks;
step two, heating the cleaned stainless steel seamless steel tube to 670-900 ℃, sealing two ends of the stainless steel seamless steel tube, and then sending the heated stainless steel seamless steel tube into a constant-temperature aluminum liquid pool;
placing the stainless steel seamless steel tube in an aluminum liquid pool for 10-60 seconds, and repeatedly scraping and brushing the surface of the stainless steel seamless steel tube by using a tool during the process, so that the aluminum liquid mixed with ferromagnetic particles fully enters the hairline cracks on the surface of the stainless steel seamless steel tube;
step four, slowly lifting the stainless steel seamless steel tube from the aluminum liquid pool at the speed of 1-4 cm/s, continuously and repeatedly scraping and brushing the surface of the stainless steel seamless steel tube by using tools during the lifting period so as to scrape redundant aluminum liquid, enabling the aluminum liquid to be distributed in cracks of the stainless steel seamless steel tube as uniformly as possible, and enabling the scraped redundant aluminum liquid to fall back into the aluminum liquid pool;
step five, moving the stainless steel seamless steel pipe out of the aluminum liquid pool, cooling the stainless steel seamless steel pipe to below 660 ℃, and feeding the stainless steel seamless steel pipe into an induction furnace; the stainless steel seamless steel pipe passes through the inside of an induction furnace in a slow rotation mode, and the heating temperature of the induction furnace is 660 ℃;
and step six, after the stainless steel seamless steel pipe is output from the induction electric furnace, naturally cooling the induction electric furnace, and then grinding and polishing the induction electric furnace to finish the elimination of the fine cracks.
2. The process for eliminating the fine cracks on the surface of the stainless steel seamless steel tube as claimed in claim 1, wherein the molten aluminum pool is internally provided with molten aluminum mixed with ferromagnetic particles, and the ratio of the molten aluminum to the ferromagnetic particles is 1000: 1-500 ℃, and keeping the aluminum liquid in the aluminum liquid pool at a constant temperature of 670-900 ℃.
3. The process for eliminating microcracks on the surface of a stainless steel seamless steel pipe according to claim 1, wherein the second, third, fourth and fifth steps are carried out in a vacuum environment.
4. A processing device applied to the surface crazing removal process of the stainless steel seamless steel tube according to the claim 1 is characterized by comprising a first heating device (2) arranged at the inlet end of a vacuum chamber (1), a second heating device (3) arranged at the outlet end of the vacuum chamber (1), a constant-temperature aluminum liquid pool (4) arranged in the vacuum chamber (1) and a steel tube moving mechanism (5) arranged above the constant-temperature aluminum liquid pool (4), wherein a steel tube scraping and brushing mechanism (6) is further arranged on the steel tube moving mechanism (5);
the steel pipe moving mechanism (5) comprises a guide rail (7) fixed at the upper end in the vacuum chamber (1), a first trolley (8) movably connected to the guide rail (7), two first telescopic mechanisms (9) respectively connected to two ends of the first trolley (8) in a left-right moving mode, and two clamping arms (10) respectively fixed to telescopic rods of the first telescopic mechanisms (9), wherein end parts of the two clamping arms (10) are respectively fixed with a plug (11);
the plug (11) consists of a main body (12) and a truncated cone-shaped convex block (13) which is convexly arranged at one end of the main body (12), the main body (12) is fixed at the lower end of the clamping arm (10), one end, close to the main body (12), of the convex block (13) is further fixedly provided with a circle of copper ring (14), the joint of the convex block (13) and the main body (12) is further provided with a circle of concave ring (15), the main body (12) is further provided with a diversion trench (16) which penetrates through the concave ring (15) and the bottom of the main body (12), and the concave ring (15) and the diversion trench (16) are arranged for rapidly guiding out aluminum liquid accumulated between the end part of the stainless steel seamless steel pipe and the plug (11);
the steel pipe scraping and brushing mechanism (6) consists of a support (17) and a scraping and brushing head (18), an inner rail is arranged in the middle of the first trolley (8), a second trolley (19) is movably connected to the first trolley (8), a second telescopic mechanism (20) is further arranged on the second trolley (19), the support (17) is located below the first trolley (8) and is connected with a telescopic rod of the second telescopic mechanism (20), and the scraping and brushing head (18) is fixed at the bottom of the support (17) and is coaxially arranged with the two plugs (11);
scrape brush head (18) middle part and have through-hole (21), both ends still have respectively in through-hole (21) bulge loop (22) to the slope setting at through-hole (21) both ends, the internal diameter of bulge loop (22) and the seamless steel pipe external diameter of processed stainless steel are corresponding, the section of bulge loop (22) is curved oblique triangle for the top, and bulge loop (22) scrape the brush with the outer wall looks butt of steel pipe to the outer wall of seamless steel pipe of stainless steel, the lower extreme of scraping brush head (18) still has deep trouth (23) that the multichannel link up through-hole (21), deep trouth (23) are used for in time discharging the aluminium liquid of being scraped down.
5. The apparatus for eliminating the fine cracks on the surface of the stainless steel seamless steel pipe according to claim 4, wherein the first heating device (2) and the second heating device (3) are both high-frequency heating furnaces.
6. The equipment for eliminating the fine cracks on the surface of the stainless steel seamless steel tube according to claim 5, wherein the first telescoping mechanism (9) and the second telescoping mechanism (20) are both electric cylinders, the guide rail (7) is a double-track guide rail, the first trolley (8) is movably connected in the double-track guide rail, the electric cylinders for driving the first telescoping mechanism (9) to move are further arranged at two ends of the first trolley (8), a long groove (24) which runs through the inner track is further formed in the top of the first trolley (8), and the long groove (24) extends out of the upper end of the second telescoping mechanism (20).
7. The equipment for eliminating and processing the microcracks on the surface of the stainless steel seamless steel pipe as claimed in claim 6, wherein the outlet end of the first heating device (2) and the inlet end of the second heating device (3) are respectively provided with a first steel pipe bracket (25), the same side of the two first steel pipe brackets (25) is respectively provided with a second steel pipe bracket (26), the first steel pipe bracket (25) on one side of the first heating device (2) and the second steel pipe bracket (26) of the second heating device (3) are respectively provided with a pipe turning mechanism (27) for transferring the stainless steel seamless steel pipe to the other steel pipe bracket, the first steel pipe bracket (25) of the second heating device (3) is further provided with a steel pipe conveying roller (28), the steel pipe conveying roller (28) is divided into a transverse conveying roller and an oblique conveying roller for conveying the steel pipe into the second heating device (3) in a rotating manner, the guide rail (7) is positioned right above the two second steel pipe brackets (26), and the constant temperature aluminum liquid pool (4) is positioned between the two second steel pipe brackets (26).
8. The equipment for eliminating the fine cracks on the surface of the stainless steel seamless steel tube as claimed in claim 7, wherein the clamping arm (10), the plug (11), the bracket (17) and the scraping brush head (18) are all mirror surfaces in appearance.
9. The equipment for eliminating the fine cracks on the surface of the stainless steel seamless steel pipe according to claim 8, wherein a plurality of guide rods (29) are further arranged between the bracket (17) and the second trolley (19), and guide holes corresponding to the guide rods (29) are formed in the bracket (17).
10. The equipment for eliminating the fine cracks on the surface of the stainless steel seamless steel tube as claimed in claim 9, wherein two pairs of convex rings (22) are arranged in the through hole (21) of the scraping brush head (18), a liquid discharge groove (30) is formed between every two convex rings (22), and each liquid discharge groove (30) is communicated with the corresponding deep groove (23).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210890334.5A CN115178964B (en) | 2022-07-27 | Stainless steel seamless steel pipe surface fine crack elimination process and processing equipment thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210890334.5A CN115178964B (en) | 2022-07-27 | Stainless steel seamless steel pipe surface fine crack elimination process and processing equipment thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115178964A true CN115178964A (en) | 2022-10-14 |
| CN115178964B CN115178964B (en) | 2024-07-05 |
Family
ID=
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Effective date of registration: 20240605 Address after: No. 229 Ruiyang Avenue, Xiping Street, Songyang County, Lishui City, Zhejiang Province, 323400 Applicant after: ZHEJIANG JINXIN STAINLESS STEEL MANUFACTURE CO.,LTD. Country or region after: China Address before: 323400 No.278 Yongning Road, Xiping street, Songyang County, Lishui City, Zhejiang Province Applicant before: ZHEJIANG JUNDA STEEL PIPE MANUFACTURING Co.,Ltd. Country or region before: China |
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