CN116423166A - Forming method of large thin-wall seal head - Google Patents
Forming method of large thin-wall seal head Download PDFInfo
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- CN116423166A CN116423166A CN202310629652.0A CN202310629652A CN116423166A CN 116423166 A CN116423166 A CN 116423166A CN 202310629652 A CN202310629652 A CN 202310629652A CN 116423166 A CN116423166 A CN 116423166A
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 241000219112 Cucumis Species 0.000 claims abstract description 70
- 235000015510 Cucumis melo subsp melo Nutrition 0.000 claims abstract description 70
- FJJCIZWZNKZHII-UHFFFAOYSA-N [4,6-bis(cyanoamino)-1,3,5-triazin-2-yl]cyanamide Chemical compound N#CNC1=NC(NC#N)=NC(NC#N)=N1 FJJCIZWZNKZHII-UHFFFAOYSA-N 0.000 claims abstract description 70
- 238000003466 welding Methods 0.000 claims abstract description 68
- 238000010438 heat treatment Methods 0.000 claims abstract description 32
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 23
- 238000005520 cutting process Methods 0.000 claims abstract description 12
- 229910052742 iron Inorganic materials 0.000 claims abstract description 11
- 238000000465 moulding Methods 0.000 claims abstract description 10
- 238000005496 tempering Methods 0.000 claims abstract description 7
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 6
- 238000004519 manufacturing process Methods 0.000 claims abstract description 6
- 239000010959 steel Substances 0.000 claims abstract description 6
- 238000012360 testing method Methods 0.000 claims description 23
- 238000007789 sealing Methods 0.000 claims description 22
- 238000001514 detection method Methods 0.000 claims description 20
- 239000010935 stainless steel Substances 0.000 claims description 17
- 229910001220 stainless steel Inorganic materials 0.000 claims description 17
- 239000007789 gas Substances 0.000 claims description 11
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 10
- 239000010962 carbon steel Substances 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 9
- 239000002131 composite material Substances 0.000 claims description 7
- 238000005422 blasting Methods 0.000 claims description 6
- 238000005259 measurement Methods 0.000 claims description 6
- 238000005498 polishing Methods 0.000 claims description 5
- 238000011084 recovery Methods 0.000 claims description 5
- 208000010727 head pressing Diseases 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 3
- 230000007547 defect Effects 0.000 claims description 3
- 230000008030 elimination Effects 0.000 claims description 3
- 238000003379 elimination reaction Methods 0.000 claims description 3
- 229910052739 hydrogen Inorganic materials 0.000 claims description 3
- 239000001257 hydrogen Substances 0.000 claims description 3
- 238000007373 indentation Methods 0.000 claims description 3
- 238000011056 performance test Methods 0.000 claims description 3
- 238000004080 punching Methods 0.000 claims description 3
- 238000004381 surface treatment Methods 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims description 2
- 230000000903 blocking effect Effects 0.000 claims 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000002826 coolant Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000010953 base metal Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 235000000396 iron Nutrition 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000009659 non-destructive testing Methods 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 230000007704 transition Effects 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
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The invention discloses a molding method of a large thin-wall seal head, which belongs to a seal head molding method, wherein a new mold is not required to be prepared, the seal head molding can be completed on the basis of the original mold, the molded seal head size is more in accordance with the regulations, and the surface quality of the seal head is improved. The method mainly comprises the following steps of inspecting and detecting the steel plate for manufacturing the seal head; respectively blanking the round plate at the top of the end socket and the melon petals at the end socket by adopting numerical control gas cutting; a lifting lug is welded on the head top round plate and each head melon petal; respectively conveying the head top circular plate and the head melon petals into a heating furnace through lifting lugs for heat treatment; carrying out stamping forming after heat treatment; performing heat treatment on the restoration performance of the seal head top round plate and the seal head melon segments after the stamping forming, and adopting a normalizing and tempering mode; checking the shape deviation of the end socket and checking the surface quality of the end socket; performing end socket assembly; and assembling the end sockets, and splicing and welding in a mode of fixing the welding gantry iron. The invention is mainly used for molding the large thin-wall seal head.
Description
Technical Field
The invention relates to a seal head forming method, in particular to a forming method of a large thin-wall seal head.
Background
The closure head serves as an important connecting part of the container and plays a very important role in the final forming quality of the container. Along with the development of large-scale domestic equipment, the requirements on the forming of the sealing heads are more strict, and particularly the sealing heads for large-scale thin-wall containers are more strict. The large thin-wall seal head is easy to deform in the manufacturing process and cannot meet the requirement of assembly size after being assembled with other components of the container. At present, a seal head is usually prepared by adopting a stamping forming mode, but because the specification of the seal head is not fixed, a new die is needed to be prepared each time, the larger the size of the seal head is, the higher the specification of the needed die is, the higher the price is, and the recycling rate is not high.
Disclosure of Invention
The invention aims to provide a molding method of a large thin-wall seal head, which can finish seal head molding on the basis of an original mold without preparing a new mold, and the molded seal head has a size more in accordance with regulations, so that the surface quality of the seal head is improved.
The invention is realized by the following technical scheme:
a molding method of a large thin-wall seal head comprises the following steps,
s1: inspecting and detecting the steel plate for manufacturing the seal head;
s2: respectively blanking the round plate at the top of the end socket and the melon petals at the end socket by adopting numerical control gas cutting;
s3: a lifting lug is welded on the head top round plate and each head melon petal;
s4: respectively conveying the head top circular plate and the head melon petals into a heating furnace through lifting lugs for heat treatment; carrying out stamping forming after heat treatment;
s5, performing recovery performance heat treatment on the seal head top round plate and the seal head melon segments after stamping forming, and adopting a normalizing and tempering mode;
s6: checking the shape deviation of the end socket and checking the surface quality of the end socket;
s7: performing end socket assembly;
s8: the end socket assembly is carried out by adopting a welding gantry iron fixing mode to carry out splicing welding;
s9: the forming detection comprises end socket shape deviation detection and end socket surface quality detection;
s10: and (5) surface treatment.
Further, in step S2, the seal head top round plate adopts a block blanking mode, a groove is formed on the seal head top round plate to be spliced after block blanking, the formed groove needs to be polished, flaw detection is carried out on the groove, and the groove flaw detection of the seal head top round plate is carried out according to NB/T47013-2015 for 100%MT detection; and welding the end socket top round plate for block blanking.
Further, the offset of the end socket top round plate subjected to block blanking after welding forming is less than or equal to 2mm; welding is performed by welding rod arc welding, and the preheating temperature is more than or equal to 160 ℃; furnace external hydrogen elimination is carried out after welding: 2h at 250-300 ℃; weld inspection was performed according to NB/T47013-2015 criteria.
Further, in step S2, the method further includes preparing a test board, and numbering the test board, so as to facilitate subsequent testing; in step S4, the corresponding test plate is subjected to heat treatment in the same furnace during heat treatment, and is subjected to punch forming, wherein the test plate is used for verifying the performance test of the seal head.
Further, in step S4, polishing the surfaces of the punch and the blank holder of the punching machine to remove impurities and greasy dirt on the surfaces; removing oxide skin on a circular plate at the top of the seal head and a melon petal of the seal head, and avoiding the occurrence of pits and pit surface defects after stamping forming; if the round plate at the top of the seal head and the melon segments of the seal head are made of stainless steel or composite plates, a carbon steel tool during seal head pressing is required to be painted for protection, so that the stainless steel surface is prevented from being polluted by carbon steel.
Further, in step S4, when the curved surface of the closure head melon segment after the first press forming does not meet the requirement, the heat treatment is required again, and the second press forming is performed.
Further, in step S6 or S9,
and (3) checking shape deviation of the end socket:
1) Adopting a full-size inner template with a gap to check the shape deviation of the head melon petals, wherein the retraction size of the gap template is 0.625% -1% Di, the template is perpendicular to the surface to be tested during checking, and the maximum shape deviation of the template and the inner surface of the head is the largest: the convex and concave are smaller than or equal to the numerical values specified in GB/T25198-2010;
2) The limit deviation of the template profile size is checked according to the specification of m level in GB/T1804-2000;
3) When the shape tolerance of the inner surface of the seal head is checked, providing a gap data every less than or equal to 400mm on 4 position sections at the effective size, measuring at least 10 points of gap data in each group, providing the thickness measurement size of the seal head at the position, arranging measurement points to meet the requirements of GB/T25198-2010, and enabling the thickness of the seal head to be more than or equal to the minimum thickness number required;
and (3) checking the surface quality of the end socket:
if the indentation depth exceeds the numerical value specified by the standard and technical conditions, repair welding and grinding are needed, and the thickness of the ground seal head is larger than the minimum wall thickness.
Further, in step S7, the method further includes the steps of:
1) Supporting each head melon segment and each head top round plate through a supporting working platform for head welding, and carrying out secondary number line, gas cutting and demonstration assembly on each head melon segment and each head top round plate; after proper modeling, removing the allowance of the last head melon segment and making a groove;
2) After the assembly of each head melon segment is completed and proper, the head top round plate and each head melon segment are assembled;
3) Removing the allowance of a circular plate at the top of the seal head in a gas cutting mode, and simultaneously forming a groove;
4) And (3) checking the size of the head after the head is assembled, numbering each melon segment according to the sequence of head assembling, and marking.
Further, in step S8, the method further includes the steps of:
1) Checking the sizes of the sealing head melon petals and the sealing head top round plate and the grooves of the to-be-welded parts by using a test template, reserving 10-20 mm allowance at the large opening end of each sealing head melon petal, and turning after the whole welding of the sealing heads is finished;
2) Welding gantry iron at intervals of 200mm-300mm at the weld joint to be welded, adding a meter-shaped support at the end opening of the end socket, isolating the welding position of the meter-shaped support and the inner wall of the end socket by adopting a stainless steel backing plate of 1mm-2mm if the end socket adopts stainless steel or a composite plate and other materials, and eliminating the need of isolating if the welding position is made of carbon steel of the same material;
3) And (3) performing splicing welding, wherein symmetrical welding and multi-pass welding are adopted when welding seams among the seal head melon segments and between the seal head melon segments and the seal head top circular plate are spliced.
Further, in step S10, the forming head is surface-treated by shot blasting, the scale is removed, and the part which cannot be removed by shot blasting is polished.
Compared with the prior art, the invention has the beneficial effects that:
1. for large thin-wall sealing heads, the dependence on the die is reduced by adopting a split assembly welding mode, a new die is not required to be prepared, and the sealing head forming can be completed on the basis of the original die.
2. In order to prevent welding deformation, welding gantry irons at intervals of 200mm-300mm at the weld joint to be welded, and ensuring that the formed offset after welding meets the requirement.
3. The secondary stamping can enable the large-size thin-wall sealing head to meet the processing requirement on the basis of utilizing the original grinding tool, and the size of the formed sealing head meets the regulations.
4. And (3) polishing the surfaces of tools such as a punch and a blank holder to remove impurities and greasy dirt on the surfaces, and if the seal head is made of stainless steel or composite board materials, performing painting protection on the carbon steel tool during seal head pressing to prevent carbon steel from polluting the stainless steel surface.
5. The test plate is treated in the same furnace, so that the performance of the sealing head can be better verified.
6. The heat treatment of recovery performance adopts a normalizing and tempering mode, and tempering heat treatment is carried out after normalizing treatment, so that the strength, plasticity and toughness of the plate can be improved, and the plate can obtain better mechanical performance; when the plate is cooled, the uniformity of the cooling medium influences the mechanical properties of each melon segment and the top circular plate.
7. After each melon petal of the end socket is punched, prepared and molded in a head modeling mode, the residual allowance is removed, and the large-port allowance of the end socket is not removed temporarily in order to ensure the molding quality of the final end socket; preparing a groove by adopting a gas cutting mode, polishing the surface of the groove after gas cutting, and carrying out nondestructive testing on the surface of the groove; and after proper assembly, removing the allowance of the melon petals 8, chamfering, removing the allowance of the top round plate in a gas cutting mode, chamfering, and ensuring that the assembly of the end socket meets the requirements.
8. In order to ensure the final forming of the sealing heads, a 10mm-20mm allowance is reserved at the large opening end of each melon petal, and the sealing heads are machined after the whole welding is finished, so that the flatness of the ports is ensured, the straightness of the container is further ensured, and the use requirement of the container is met; the rice-shaped support is adopted, and the welding position of the rice-shaped support and the inner wall of the seal head is isolated by adopting a stainless steel backing plate with the thickness of 1mm-2mm, so that the welding quality is ensured.
Drawings
FIG. 1 is a schematic view of the head top circular plate and head melon petals of the present invention;
FIG. 2 is a schematic view of a weld planer iron of the present invention;
FIG. 3 is a schematic view of the structure of the gantry iron of the present invention;
FIG. 4 is a schematic view of the installation of the stainless steel backing plate of the present invention;
FIG. 5 is a schematic flow chart of the present invention;
FIG. 6 is a schematic view of the test panel numbering of the present invention;
FIG. 7 is a schematic view of a heat treatment of the present invention;
FIG. 8 is a schematic of a recovery performance heat treatment of the present invention.
In the figure: 1. a gantry iron; 2. stainless steel backing plate.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1, 2 and 5, the molding method of the large thin-wall seal head in embodiment 1 comprises the following steps,
s1: inspecting and detecting the steel plate for end socket manufacturing, inspecting the steel plate for end socket manufacturing, conforming to the standard GB/T713-2011, detecting 100% UT of the steel plate according to NB/T47013.3-2015, and qualified in T1 grade;
s2: respectively blanking a round plate at the top of the end socket and blanking melon petals (melon petals 1-8) of the end socket by adopting numerical control gas cutting;
s3: a lifting lug is welded on the head top round plate and each head melon petal;
s4: the head top circular plate and the head melon petals are respectively conveyed into a heating furnace through lifting lugs to be subjected to heat treatment, as shown in fig. 7, the heat treatment of a certain material is performed, and the heat treatment of other materials is also performed in the prior art and is not described; carrying out stamping forming after heat treatment;
s5, performing recovery performance heat treatment on the seal head top round plate and the seal head melon petals after stamping forming, wherein as shown in FIG. 8, a normalizing (allowing accelerated cooling) +tempering mode is adopted, and water cooling is usually performed by adopting circulating water of a water tank; if the thickness of the plate is relatively large, tempering heat treatment is carried out after normalizing treatment, so that the strength, plasticity and toughness of the plate can be improved, and the plate has better mechanical properties; when the plate is cooled, the uniformity of the cooling medium influences the mechanical properties of each melon segment and the top circular plate;
s6: checking the shape deviation of the end socket and checking the surface quality of the end socket;
s7: performing end socket assembly;
s8: the end socket assembly is carried out by adopting a mode of fixing the welding gantry iron 1;
s9: the forming detection comprises end socket shape deviation detection and end socket surface quality detection;
s10: and (5) surface treatment.
In the embodiment 2, a large-size end enclosure and an end enclosure top round plate are subjected to block blanking (for example, a plate 1 and a plate 2 are subjected to block blanking, the sizes of the plate 1 and the plate 2 are adjustable, and a block scheme is shown in fig. 1), grooves are formed in the end enclosure top round plate to be spliced after the block blanking, the formed grooves are polished, flaw detection is carried out on the grooves, and the end enclosure top round plate groove flaw detection is carried out by 100% MT according to NB/T47013-2015; welding end socket top round plates subjected to block blanking; the offset of the end socket top round plate subjected to block blanking after welding forming is less than or equal to 2mm; welding is performed by welding rod arc welding, a J507 welding rod phi 3.2/phi 5.0 is adopted, and the preheating temperature is more than or equal to 160 ℃; furnace external hydrogen elimination is carried out after welding: (250-300) DEG C x 2h; weld flaw detection is carried out according to NB/T47013-2015 standard; in step S2, further including preparing a test board, and numbering the test board, as shown in fig. 6, to facilitate subsequent testing; in the step S4, the corresponding test plate is subjected to heat treatment in the same furnace during heat treatment, the test plate is subjected to stamping forming, the test plate is used for verifying the performance test of the sealing head, if the results of all detection items of the test plate are compared with the mechanical property detection of a base metal of a plate manufacturer, the tensile strength and the yield strength are only slightly reduced, the impact energy of-20 ℃ (V-type) is not greatly changed, the shearing strength is slightly improved, no crack is generated in an intergranular corrosion test, and under the condition, the relevant performance still meets the requirements of user design and relevant material standards after the sealing head is subjected to heat forming; in step S4, polishing the surfaces of tools such as a punch and a blank holder of a punching machine, and removing impurities and greasy dirt on the surfaces; removing oxide skin on a circular plate at the top of the seal head and a melon petal of the seal head, and avoiding surface defects such as pits, pits and the like after stamping forming; if the round plate at the top of the seal head and the melon segments of the seal head are made of stainless steel or composite plates, a carbon steel tool during seal head pressing is required to be painted for protection, so that the carbon steel is prevented from polluting the surface of the stainless steel; in the step S4, when the curved surface of the head melon segment after the first stamping forming does not meet the requirement, heat treatment is needed again, and the second stamping forming is carried out;
in step S6 or S9,
and (3) checking shape deviation of the end socket:
1) The shape deviation of the end socket melon petals is checked by adopting a full-size inner template (prior art) with a gap, the retraction size of the gap template is 0.625% -1% Di, the template is perpendicular to the surface to be tested during checking, and the maximum shape deviation of the template and the end socket inner surface is: the convex and concave are smaller than or equal to the numerical values specified in GB/T25198-2010;
2) The limit deviation of the template profile size is checked according to the specification of m level in GB/T1804-2000;
3) When the shape tolerance of the inner surface of the seal head is checked, providing a gap data every less than or equal to 400mm on 4 position sections at the effective size, measuring at least 10 points of gap data in each group, providing the thickness measurement size of the seal head at the position, arranging measurement points to meet the requirements of GB/T25198-2010, and enabling the thickness of the seal head to be more than or equal to the minimum thickness number required; after the seal head is stamped, the thickness of the middle part of the seal head is often reduced, and the end opening of the seal head is thickened due to huge impact force, so that the use performance and the service life of the container are ensured, and the parts (the top part of the seal head, the corner transition part and the like) and the straight edge parts of the seal head, which are easy to be subjected to process reduction, are detected;
and (3) checking the surface quality of the end socket:
if the indentation depth exceeds the numerical value specified by the standard and technical conditions, repair welding and grinding are needed, and the thickness of the ground seal head is larger than the minimum wall thickness;
in step S7, the method further includes the steps of:
1) Supporting each head melon segment and each head top round plate through a supporting working platform for head welding, wherein the supporting working platform for head welding is in the prior art, carrying out secondary number line and gas cutting and performing assembly on each head melon segment (melon segment 1-melon segment 8) and each head top round plate (the head melon segment 8 and the head top round plate are temporarily not provided with grooves for leaving allowance), removing allowance and providing grooves after each melon segment is properly performed, and the port allowance at the straight edge of each melon segment 1-melon segment 8 is reserved); after proper modeling, removing the allowance of the last head melon petal (melon petal 8) and making a groove;
2) After the assembly of each head melon segment is completed and proper, the head top circular plate and each head melon segment are assembled, and the relative positions of the top circular plate edge joint and the melon segment edge joint are needed to be paid attention to during the assembly;
3) Removing the allowance of a circular plate at the top of the seal head in a gas cutting mode, and simultaneously forming a groove;
4) Checking the size of the head after the assembly, numbering each melon segment according to the assembly sequence of the head and marking after the size meets the requirement;
in step S8, the method further includes the steps of:
1) Checking the size of each head melon petal and the head top round plate and the groove of the part to be welded by using a test template, reserving 10-20 mm allowance at the large opening end of each head melon petal for guaranteeing the final forming of the head, and turning after the head is integrally welded to ensure the flatness of the port, thereby guaranteeing the straightness of the container and meeting the use requirement of the container;
2) In order to ensure the dimensional tolerance of the end socket port, an anti-deformation tool is required to be added before the end socket is assembled, as shown in fig. 3, a welding method of a gantry iron 1 is adopted, according to actual conditions, the gantry iron 1 is welded at intervals of 200mm-300mm at a welding line to be welded, a rice-shaped support is added at the end socket port, as shown in fig. 4, if the end socket is made of stainless steel or a composite plate and other materials, the welding position of the rice-shaped support and the inner wall of the end socket is isolated by a stainless steel backing plate 2 of 1mm-2mm, and if the end socket is made of carbon steel of the same material, the isolation is not required;
3) Performing splicing welding, wherein when welding seams among the seal head melon segments and the seal head top circular plate are spliced, symmetrical welding and multiple welding are adopted to prevent welding deformation; controlling welding parameters, adopting small current, controlling the temperature between channels, and welding by a welding machine to improve the working efficiency, wherein the parameters can be adjusted and then the welding is performed by an automatic welding machine;
in step S10, the forming head is surface-treated by shot blasting, the scale is removed, and the part which cannot be removed by shot blasting is polished, otherwise, the same as in example 1.
Claims (10)
1. A molding method of a large thin-wall seal head is characterized in that: comprises the following steps of the method,
s1: inspecting and detecting the steel plate for manufacturing the seal head;
s2: blanking a circular plate at the top of the seal head and blanking a melon petal of the seal head;
s3: a lifting lug is welded on the head top round plate and each head melon petal;
s4: respectively conveying the head top circular plate and the head melon petals into a heating furnace through lifting lugs for heat treatment; carrying out stamping forming after heat treatment;
s5, performing recovery performance heat treatment on the seal head top round plate and the seal head melon segments after stamping forming, and adopting a normalizing and tempering mode;
s6: checking the shape deviation of the end socket and checking the surface quality of the end socket;
s7: performing end socket assembly;
s8: the end socket assembly is carried out by adopting a fixed mode of welding a gantry iron (1);
s9: the forming detection comprises end socket shape deviation detection and end socket surface quality detection;
s10: and (5) surface treatment.
2. The method for forming a large thin-walled closure according to claim 1, wherein: in the step S2, the seal head top round plate adopts a blocking blanking mode, a groove is formed on the seal head top round plate to be spliced after blocking blanking, the formed groove needs to be polished, flaw detection is carried out on the groove, and 100% MT detection is carried out on the seal head top round plate groove flaw detection according to NB/T47013-2015; and welding the end socket top round plate for block blanking.
3. The method for forming a large thin-walled closure according to claim 2, wherein: the offset of the end socket top round plate subjected to block blanking after welding forming is less than or equal to 2mm; welding is performed by welding rod arc welding, and the preheating temperature is more than or equal to 160 ℃; furnace external hydrogen elimination is carried out after welding: (250-300) DEG C x 2h; weld inspection was performed according to NB/T47013-2015 criteria.
4. The method for forming a large thin-walled closure according to claim 1, wherein: in the step S2, a test board is prepared, and the test board is numbered, so that the subsequent test is convenient; in step S4, the corresponding test plate is subjected to heat treatment in the same furnace during heat treatment, and is subjected to punch forming, wherein the test plate is used for verifying the performance test of the seal head.
5. The method for forming a large thin-walled closure according to claim 1, wherein: in step S4, polishing the surfaces of the punch and the blank holder of the punching machine to remove impurities and greasy dirt on the surfaces; removing oxide skin on a circular plate at the top of the seal head and a melon petal of the seal head, and avoiding the occurrence of pits and pit surface defects after stamping forming; if the round plate at the top of the seal head and the melon segments of the seal head are made of stainless steel or composite plates, a carbon steel tool during seal head pressing is required to be painted for protection, so that the stainless steel surface is prevented from being polluted by carbon steel.
6. The method for forming a large thin-walled closure according to claim 1, wherein: in step S4, when the curved surface of the melon segments of the end socket after the first stamping forming does not meet the requirement, the heat treatment is performed again, and the second stamping forming is performed.
7. The method for forming a large thin-walled closure according to claim 1, wherein: in step S6 or S9,
and (3) checking shape deviation of the end socket:
1) Adopting a full-size inner template with a gap to check the shape deviation of the head melon petals, wherein the retraction size of the gap template is 0.625% -1% Di, the template is perpendicular to the surface to be tested during checking, and the maximum shape deviation of the template and the inner surface of the head is the largest: the convex and concave are smaller than or equal to the numerical values specified in GB/T25198-2010;
2) The limit deviation of the template profile size is checked according to the specification of m level in GB/T1804-2000;
3) When the shape tolerance of the inner surface of the seal head is checked, providing a gap data every less than or equal to 400mm on 4 position sections at the effective size, measuring at least 10 points of gap data in each group, providing the thickness measurement size of the seal head at the position, arranging measurement points to meet the requirements of GB/T25198-2010, and enabling the thickness of the seal head to be more than or equal to the minimum thickness number required;
and (3) checking the surface quality of the end socket:
if the indentation depth exceeds the numerical value specified by the standard and technical conditions, repair welding and grinding are needed, and the thickness of the ground seal head is larger than the minimum wall thickness.
8. The method for forming a large thin-walled closure according to claim 1, wherein: in step S7, the method further includes the steps of:
1) Supporting each head melon segment and each head top round plate through a supporting working platform for head welding, and carrying out secondary number line, gas cutting and demonstration assembly on each head melon segment and each head top round plate; after proper modeling, removing the allowance of the last head melon segment and making a groove;
2) After the assembly of each head melon segment is completed and proper, the head top round plate and each head melon segment are assembled;
3) Removing the allowance of a circular plate at the top of the seal head in a gas cutting mode, and simultaneously forming a groove;
4) And (3) checking the size of the head after the head is assembled, numbering each melon segment according to the sequence of head assembling, and marking.
9. The method for forming a large thin-walled closure according to claim 1, wherein: in step S8, the method further includes the steps of:
1) Checking the sizes of the sealing head melon petals and the sealing head top round plate and the grooves of the to-be-welded parts by using a test template, reserving 10-20 mm allowance at the large opening end of each sealing head melon petal, and turning after the whole welding of the sealing heads is finished;
2) Welding gantry iron (1) at intervals of 200mm-300mm at a welding seam to be welded, adding a meter-shaped support at a port of the sealing head, and isolating the welding position of the meter-shaped support and the inner wall of the sealing head by adopting a stainless steel backing plate (2) with the length of 1mm-2mm if the sealing head is made of stainless steel or composite board materials;
3) And (3) performing splicing welding, wherein symmetrical welding and multi-pass welding are adopted when welding seams among the seal head melon segments and between the seal head melon segments and the seal head top circular plate are spliced.
10. The method for forming a large thin-walled closure according to claim 1, wherein: in step S10, the forming head is surface-treated by shot blasting, and the scale is removed and the part which cannot be removed by shot blasting is polished.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310629652.0A CN116423166A (en) | 2023-05-31 | 2023-05-31 | Forming method of large thin-wall seal head |
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| CN202310629652.0A CN116423166A (en) | 2023-05-31 | 2023-05-31 | Forming method of large thin-wall seal head |
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