CN113059255A - Super-thick steel plate S-shaped welding groove and machining method - Google Patents
Super-thick steel plate S-shaped welding groove and machining method Download PDFInfo
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- CN113059255A CN113059255A CN202110428480.1A CN202110428480A CN113059255A CN 113059255 A CN113059255 A CN 113059255A CN 202110428480 A CN202110428480 A CN 202110428480A CN 113059255 A CN113059255 A CN 113059255A
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- 238000003466 welding Methods 0.000 title claims abstract description 67
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 45
- 239000010959 steel Substances 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims description 24
- 238000003754 machining Methods 0.000 title claims description 10
- 238000005520 cutting process Methods 0.000 claims abstract description 27
- 239000000463 material Substances 0.000 claims abstract description 17
- 238000012545 processing Methods 0.000 claims abstract description 16
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 14
- 239000004575 stone Substances 0.000 claims description 5
- 230000007547 defect Effects 0.000 claims description 4
- 238000013461 design Methods 0.000 claims description 4
- 238000005457 optimization Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 3
- 210000001503 joint Anatomy 0.000 claims description 3
- 239000002932 luster Substances 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 238000005498 polishing Methods 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims description 2
- 238000003672 processing method Methods 0.000 abstract description 6
- 230000000087 stabilizing effect Effects 0.000 abstract description 2
- 238000004140 cleaning Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 241001330002 Bambuseae Species 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000009865 steel metallurgy Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K7/00—Cutting, scarfing, or desurfacing by applying flames
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K7/00—Cutting, scarfing, or desurfacing by applying flames
- B23K7/10—Auxiliary devices, e.g. for guiding or supporting the torch
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/013—Arc cutting, gouging, scarfing or desurfacing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/32—Accessories
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/18—Sheet panels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/02—Iron or ferrous alloys
- B23K2103/04—Steel or steel alloys
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- Plasma & Fusion (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention discloses an S-shaped welding groove of an ultra-thick steel plate and a processing method, wherein the S-shaped groove is a combination of a V-shaped groove and a U-shaped groove, the V-shaped groove is processed by adopting flame linear cutting, then the root part of the V-shaped groove is planed by adopting a carbon arc gouging machine to form a small U-shaped groove surface, a final angle grinder is used for cleaning the surface, the S-shaped groove has the advantages of saving welding auxiliary materials, reducing labor intensity and improving efficiency, is convenient to operate in actual processing, is not restricted by a field, is simple in adopted machine tools, short in processing period and the like, the S-shaped groove can be used for processing and welding engineering thick steel plates of welding steel structure bridges, steel structure high-rise buildings and the like, the good effects of improving work efficiency and reducing cost are achieved, the problems of reducing welding deformation, stabilizing the geometrical size of a rod piece and the contradiction between the number of the used welding auxiliary materials and the size of the groove are, can save welding materials by more than 30 percent, and improve the working efficiency by more than 40 percent.
Description
Technical Field
The invention belongs to the technical field of steel structure processing, and particularly relates to an ultra-thick steel plate S-shaped welding groove and a processing method.
Background
With the development of metal material science in China, the steel metallurgy technology promotes the development of engineering technologies such as railways, high-rise high-steel structure buildings and the like, the design is novel, the shape is unique, particularly, large-span bridges and high-rise steel structures such as bamboo shoots in spring after rain, particularly, the variety of materials used by the engineering is more and more, and the thickness of the steel is thicker and thicker. Although the welding technology is greatly improved, the traditional processing method is still maintained in the processing and manufacturing process of steel structure engineering, wherein the processing of the welding groove has no major breakthrough at present. Welding materials are reduced, welding deformation and internal stress are reduced, machining is needed for completion, cost is increased, and work efficiency is affected; flame cutting improves work efficiency and reduces cost, but the used welding materials are increased, welding deformation is increased, and internal stress is increased. And various groove types and processing are optimized in the aspects of construction cost, structure types, plate thickness and the like, and a processing and manufacturing process is selected. The groove machining is directly processed by planing, milling, flame cutting and the like at present, and perfect optimization cannot be achieved.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides an S-shaped welding groove of an ultra-thick steel plate and a processing method thereof. The S-shaped groove and the processing method are simple and efficient in processing operation, welding materials are reduced, welding labor intensity is reduced, working efficiency is integrally improved, welding deformation and welding stress can be reduced, and labor, energy and efficiency are reduced, and cost is lowered in the actual processing and manufacturing process.
The specific technical scheme of the invention is as follows:
the S-shaped welding groove of the super-thick steel plate comprises a steel plate body, wherein the S-shaped groove is arranged on one side of the steel plate body, so that a planing area and a welding material saving area are formed on one side of the steel plate, and the angle of the S-shaped groove is 25-40 degrees.
Preferably, the angle of the S-shaped groove is 30 °.
According to the preferable technical scheme, an arc is drawn downwards to the position of 2-5 mm on the bottom edge of the groove by taking the contact point of the diameter of the welding gun sheath and the bevel face as a base point, and the planing area is formed.
According to the preferable technical scheme, a 45-degree groove line on one side of the steel plate body, a 45-degree groove line and an optimized S-shaped groove edge forming area are used as welding material saving areas.
The groove machining method for the S-shaped welding groove of the super-thick steel plate is characterized by comprising the following steps of: the method comprises the following steps:
step 1: designing an S-shaped groove:
groove optimization is carried out on a conventional joint form to be welded:
1) firstly, determining the angle of an original V-shaped groove, wherein the distance between a welding gun nozzle and the bottom edge of the groove is less than 20 mm;
2) the minimum groove angle is optimized by taking the contact point of the diameter of the sheath of the welding gun and the bevel face as a base point and taking the principle that the welding gun can move freely, the welding wire melting amount is reduced and the welding time is reduced as a principle;
3) taking the contact point of the diameter of the welding gun sheath and the bevel face as a base point to draw an arc downwards to a position of 2mm on the bottom edge of the groove to be used as a planing range;
step 2: processing a single-side V-shaped groove:
after the groove angle is well machined, cutting according to the groove angle designed by the process by adopting a linear flame cutting machine, and performing modulation cutting on cutting process parameters according to conventional cutting process parameters and operation steps to finish flame cutting of the groove to form an upper half groove of the S-shaped groove;
and step 3: and (3) planing by carbon arc air planing:
after the flame cutting of the groove is finished, marking a carbon arc gouging range side line on the lower half part of the groove surface by using a stone pencil according to the thickness of the steel plate and the process design requirements; during planing, the lower half part of the S-shaped groove is planed layer by layer from top to bottom in a layered and divided way, the planing thickness of each layer is not more than 3mm, the shape of the planed single-side groove is like a half water drop, the width and the width of the planed whole body are consistent, the relative height difference of a planed surface is not more than 0.5mm, and the lower half part of the S-shaped groove is finished;
and 4, step 4: finishing an S-shaped groove:
after finishing the carbon arc gouging, polishing the surface of the gouging surface, exposing the polished gouging surface with metallic luster, wherein the thickness of a removing layer is not less than 0.5mm, the polished surface has no defect and consistent width after being polished, and the gouging surface and the edge of a flame cutting surface are in smooth transition;
and 5: and after the whole process is finished, carrying out quality detection and inspection on the geometric dimensions and the appearance of the groove and the bevel face.
As a preferred technical scheme, the original V-shaped groove comprises a butt joint, a T-shaped joint double V-shaped groove and a single-side V-shaped groove.
Preferably, the diameter of the welding gun sheath is 22 mm.
In the step 3, a stone pencil is used to draw a carbon arc gouging range side line on the lower half part of the bevel face.
Preferably, in step 4, the planing surface is ground by an angle grinder.
Has the advantages that:
the invention is applied to the manufacturing and processing industries of bridges and other steel structures with thick steel plate steel structures, can process single and double surfaces, reduces the consumption of welding auxiliary materials and welding deformation, saves raw materials, improves the work efficiency and reduces the cost.
Drawings
In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
Fig. 1 is a schematic view of a conventional welding groove.
FIG. 2 is a schematic structural view of an S-shaped welding groove of an ultra-thick steel plate.
In the figures, the reference numerals are as follows:
1 is a steel plate body, 2 is an S-shaped groove, 3 is a planing area, and 4 is a welding material saving area.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention will now be further described with reference to the accompanying drawings.
As shown in fig. 1, the conventional welding groove in the prior art belongs to a V-groove, and generally, the angle of the V-groove is 45 °, fig. 2 is a schematic view of an S-groove of the present invention, and the S-groove of the ultra-thick steel plate includes a steel plate body 1, wherein the S-groove 2 is disposed on one side of the steel plate body 1, so that a planing zone 3 and a welding material saving zone 4 are formed on one side of the steel plate, and the angle of the S-groove is 30 °.
The thick plate S-shaped groove and the processing method are as follows:
designing an S-shaped groove:
before the S-shaped groove is processed, the groove optimization needs to be carried out on the conventional joint form to be welded:
1) firstly, determining the angle of an original V-shaped groove (comprising a butt joint double V-shaped groove and a single-side V-shaped groove), wherein the distance between a welding gun nozzle and the bottom edge of the groove is less than 20mm, and the welding process requirement is ensured;
2) the minimum groove angle is optimized by taking the contact point between the diameter (generally 22mm) of a sheath of the welding gun and the bevel face as a base point, and the principle that the welding gun can move freely, the welding wire melting amount is reduced, and the welding time is shortened is taken as a principle;
3) taking the contact point of the diameter of the sheath of the welding gun and the bevel face as a base point to draw an arc downwards to the position of 2mm on the bottom edge of the groove to be used as a planing range (part to be planed), wherein the actual range of the planed arc is 2-3mm beyond a range line
And a second step of single-side V-shaped groove machining:
after the groove angle is well machined, a linear flame cutting machine can be directly adopted to cut according to the groove angle designed by the process, the cutting process parameters are modulated and cut according to the conventional cutting process parameters and the operation steps, the flame cutting groove is completed, and the upper half groove of the S-shaped groove is formed.
Thirdly, carbon arc gouging planing:
after the flame cutting of the groove is finished, marking a carbon arc gouging range side line on the lower half part of the groove surface by using a stone pencil according to the thickness of the steel plate and the process design requirements; during planing, the water is planed layer by layer from top to bottom in a layered and separated way, the planing thickness of each layer is not easy to exceed 3mm, and the planed shape is like a half water drop (the shape of a single-side groove). The width of the whole planing is consistent, the relative height difference of the planing surface is not easy to exceed 0.5mm, and the lower half part of the S-shaped groove is finished.
And step four, finishing the S-shaped groove:
after the carbon arc air gouging is finished, the gouged surface needs to be polished by an angle grinder. The polished planed surface is exposed with metallic luster, the thickness of a clearing layer (according to the planing flatness) is not less than 0.5mm, the polished surface is free of defects after polishing, the width is consistent, and the planed surface and the edge of a flame cutting surface are in smooth transition.
After the whole process is finished, the geometrical size and appearance of the groove and the bevel face need to be inspected for quality detection.
Therefore, the invention is a combination of two grooves of a V-shaped groove and a U-shaped groove, which firstly adopts flame linear cutting to process the V-shaped groove, then adopts a carbon arc gouging to process the root gouging of the V-shaped groove surface to form a small U-shaped groove surface, and finally adopts a corner grinder to clean the surface, thereby having the advantages of saving welding auxiliary materials, reducing labor intensity, improving efficiency, being convenient to operate in actual processing, being free from site restriction, simple in adopted machines and tools (common tools: a linear flame cutting machine, a carbon arc gouging and a corner grinder), short in processing period and the like, adopting the S-shaped groove to process and weld thick steel plates of engineering such as steel structure bridges, steel structure high-rise buildings and the like, being capable of improving work efficiency and reducing cost, solving the problems of reducing welding deformation, stabilizing the geometrical size of a rod piece and the contradiction between the number of the used welding auxiliary materials and the size of the groove, and being capable of being used in a, the welding material can be saved by more than 30%, the working efficiency is improved by more than 40%, and a reference basis can be provided for welding processing of similar steel structures.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
Claims (9)
1. The utility model provides an ultra-thick steel plate S type welding groove which characterized in that: the steel plate comprises a steel plate body, wherein an S-shaped groove is formed in one side of the steel plate body, so that a planing area and a welding material saving area are formed in one side of the steel plate, and the angle of the S-shaped groove is 25-40 degrees.
2. The S-shaped welding groove of an ultra-thick steel plate according to claim 1, wherein: the angle of the S-shaped groove is 30 degrees.
3. The S-shaped welding groove of an ultra-thick steel plate according to claim 1, wherein: and drawing an arc downwards to a position of 2-5 mm above the groove by taking the contact point of the diameter of the welding gun sheath and the bevel face as a base point to form the planing zone.
4. The S-shaped welding groove of an ultra-thick steel plate according to claim 1, wherein: and a 45-degree groove line on one side of the steel plate body, the 45-degree groove line and an optimized S-shaped groove edge forming area are used as welding material saving areas.
5. The method for beveling an S-shaped welding groove of an ultra-thick steel plate according to any one of claims 1 to 4, comprising the steps of: the method comprises the following steps:
step 1: designing an S-shaped groove:
groove optimization is carried out on a conventional joint form to be welded:
1) firstly, determining the angle of an original V-shaped groove, wherein the distance between a welding gun nozzle and the bottom edge of the groove is less than 20 mm;
2) the minimum groove angle is optimized by taking the contact point of the diameter of the sheath of the welding gun and the bevel face as a base point and taking the principle that the welding gun can move freely, the welding wire melting amount is reduced and the welding time is reduced as a principle;
3) taking the contact point of the diameter of the welding gun sheath and the bevel face as a base point to draw an arc downwards to a position of 2mm on the bottom edge of the groove to be used as a planing range;
step 2: processing a single-side V-shaped groove:
after the groove angle is well machined, cutting according to the groove angle designed by the process by adopting a linear flame cutting machine, and performing modulation cutting on cutting process parameters according to conventional cutting process parameters and operation steps to finish flame cutting of the groove to form an upper half groove of the S-shaped groove;
and step 3: and (3) planing by carbon arc air planing:
after the flame cutting of the groove is finished, marking a carbon arc gouging range side line on the lower half part of the groove surface by using a stone pencil according to the thickness of the steel plate and the process design requirements; during planing, the lower half part of the S-shaped groove is planed layer by layer from top to bottom in a layered and divided way, the planing thickness of each layer is not more than 3mm, the shape of the planed single-side groove is like a half water drop, the width and the width of the planed whole body are consistent, the relative height difference of a planed surface is not more than 0.5mm, and the lower half part of the S-shaped groove is finished;
and 4, step 4: finishing an S-shaped groove:
after finishing the carbon arc gouging, polishing the surface of the gouging surface, exposing the polished gouging surface with metallic luster, wherein the thickness of a removing layer is not less than 0.5mm, the polished surface has no defect and consistent width after being polished, and the gouging surface and the edge of a flame cutting surface are in smooth transition;
and 5: and after the whole process is finished, carrying out quality detection and inspection on the geometric dimensions and the appearance of the groove and the bevel face.
6. The groove machining method according to claim 5, characterized in that: the original V-shaped groove comprises a butt joint, a T-shaped joint double V-shaped groove and a single-side V-shaped groove.
7. The groove machining method according to claim 5, characterized in that: the diameter of the welding gun sheath is 22 mm.
8. The groove machining method according to claim 5, characterized in that: and 3, marking a carbon arc gouging range side line on the lower half part of the bevel face by using a stone pencil.
9. The groove machining method according to claim 5, characterized in that: and 4, grinding the surface of the planed surface by using an angle grinder.
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| CN202110428480.1A CN113059255A (en) | 2021-04-21 | 2021-04-21 | Super-thick steel plate S-shaped welding groove and machining method |
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| CN202110428480.1A CN113059255A (en) | 2021-04-21 | 2021-04-21 | Super-thick steel plate S-shaped welding groove and machining method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114769789A (en) * | 2022-04-13 | 2022-07-22 | 太重（天津）滨海重型机械有限公司 | Method for processing groove |
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| JPH02217164A (en) * | 1989-02-16 | 1990-08-29 | Koike Sanso Kogyo Co Ltd | Method and device for cutting groove of electroslag deposition part of square pillar |
| CN104759797A (en) * | 2015-04-14 | 2015-07-08 | 攀钢集团工程技术有限公司 | Combined groove for thick workpiece crack repairing and combined groove repairing technology |
| CN105689968A (en) * | 2014-11-26 | 2016-06-22 | 重庆市巴南区永兴机械厂 | Slope machining method for pressure container |
| CN107824937A (en) * | 2017-11-13 | 2018-03-23 | 南京奥特电气股份有限公司 | A kind of automatic bottoming welding technique of the narrow groove of thick-walled pipe and welding head |
| CN112453659A (en) * | 2020-10-09 | 2021-03-09 | 江阴兴澄特种钢铁有限公司 | Welding method for improving tensile stress resistance of welding joint |
| CN214867887U (en) * | 2021-04-21 | 2021-11-26 | 中铁四局集团有限公司 | Super-thick steel plate S-shaped welding groove |
-
2021
- 2021-04-21 CN CN202110428480.1A patent/CN113059255A/en active Pending
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|---|---|---|---|---|
| JPH02217164A (en) * | 1989-02-16 | 1990-08-29 | Koike Sanso Kogyo Co Ltd | Method and device for cutting groove of electroslag deposition part of square pillar |
| CN105689968A (en) * | 2014-11-26 | 2016-06-22 | 重庆市巴南区永兴机械厂 | Slope machining method for pressure container |
| CN104759797A (en) * | 2015-04-14 | 2015-07-08 | 攀钢集团工程技术有限公司 | Combined groove for thick workpiece crack repairing and combined groove repairing technology |
| CN107824937A (en) * | 2017-11-13 | 2018-03-23 | 南京奥特电气股份有限公司 | A kind of automatic bottoming welding technique of the narrow groove of thick-walled pipe and welding head |
| CN112453659A (en) * | 2020-10-09 | 2021-03-09 | 江阴兴澄特种钢铁有限公司 | Welding method for improving tensile stress resistance of welding joint |
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Non-Patent Citations (1)
| Title |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114769789A (en) * | 2022-04-13 | 2022-07-22 | 太重（天津）滨海重型机械有限公司 | Method for processing groove |
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