CN115740954A - Overlaying device and repairing process for 7-shaped movable walking frame wear surface of wheel band rolling mill - Google Patents
Overlaying device and repairing process for 7-shaped movable walking frame wear surface of wheel band rolling mill Download PDFInfo
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- CN115740954A CN115740954A CN202211512100.3A CN202211512100A CN115740954A CN 115740954 A CN115740954 A CN 115740954A CN 202211512100 A CN202211512100 A CN 202211512100A CN 115740954 A CN115740954 A CN 115740954A
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Abstract
The invention discloses a build-up welding device and a repair process for a 7-shaped movable walking frame wear surface of a rim rolling mill, wherein the build-up welding device comprises a structural part tool frame and a heating tool, wherein the structural part tool frame is integrally rectangular, and a moving device and a lifting device are arranged on the structural part tool frame; four corners of structure frock frame symmetry respectively are provided with the supporting shoe, and supporting shoe center department sets up threaded hole, elevating gear includes threaded connection in the downthehole adjusting screw of supporting shoe threaded hole, and adjusting screw's bottom can be dismantled or fixed be provided with discoid screw rod seat, and this repair technology of cooperation can effectively be restoreed to hoop rolling mill "7" style of calligraphy portable wear surface of walking, and investment cost is low, and the maintenance time is short, and repair effect is good, can provide the guarantee for the orderly operation of rolling mill.
Description
Technical Field
The invention belongs to the field of machinery, and relates to a surfacing device and a repairing process for a 7-shaped movable walking frame wear surface of a rim rolling mill.
Background
The roughing mill is a special equipment for rolling train wheel hoop, various ring parts, gear blank, crane wheel and inner and outer rings of rolling bearing, etc., and is an eight-roller horizontal rolling mill comprising base, movable large carriage, movable small carriage mechanical transmission system and high pressure water control system. These large or small traveling carriages are typically 7-shaped, as shown in fig. 1, and the wall thickness of the rolled product is controlled by the wrap rollers mounted on these large or small 7-shaped traveling carriages. Due to the long-term rolling of the roughing mill, two sides of the large and small 7-shaped movable walking frame which continuously moves back and forth are abraded, and the requirements of a rolling process cannot be met gradually along with the fact that the abrasion surface is larger and larger. If the large and small 7-shaped movable walking frames are integrally replaced, a large amount of purchasing cost is wasted, and if outsourcing manufacturers carry out off-line repair, the period is long, and the orderly development of rolling production is influenced; if an enterprise carries out bulk wear additive surfacing aiming at the wear surface, MT and PT penetration flaw detection without cracks and pore defects need to be ensured, the drawing size and precision are restored through mechanical and manual grinding, and the large walking frame and the small walking frame of the wheel band rolling mill are made of ZG270-500 materials, so that the materials have better weldability, but the main problems during welding repair are as follows: the welding thickness of the large walking frame and the small walking frame is more than 150mm, so that welding cold cracks, layered tearing and overlaying layer thickness control are easy to generate.
Disclosure of Invention
Aiming at the problems in the background technology, the invention provides a surfacing device and a repairing process for a 7-shaped movable walking frame wear surface of a rim rolling mill, and the technical scheme for solving the technical problems is as follows:
the invention relates to a 7-shaped movable type surfacing device for a wear surface of a carriage of a rim rolling mill, which comprises a structural part tool frame and a heating tool, wherein the structural part tool frame is integrally rectangular, and a moving device and a lifting device are arranged on the structural part tool frame; four corners of structure frock frame symmetry respectively are provided with the supporting shoe, and supporting shoe center department sets up threaded hole, elevating gear includes threaded connection in the downthehole adjusting screw of supporting shoe screw, and adjusting screw's bottom can be dismantled or fixed be provided with discoid screw rod seat.
Furthermore, the moving device is four moving rollers symmetrically arranged on two sides of the bottom of the structural part tooling frame.
Further, the heating tool comprises a gas main pipe, a gas interface is arranged in the middle of the gas main pipe, two ends of the gas main pipe are respectively communicated with 7-shaped gas pipes, and a plurality of burners are uniformly distributed on each 7-shaped gas pipe.
Further, the structural part tool frame is formed by cutting and processing a steel plate with the thickness of 80 mm.
Furthermore, the supporting block is formed by machining a steel plate with the thickness of 60mm and is welded at the corner of the structural part tool rack, and the adjusting screw is formed by machining a round bar with the diameter of 50 mm.
The invention relates to a repair process of a 7-shaped movable walking frame wear surface of a wheel band rolling mill, wherein the wear surface is positioned on two side surfaces of the 7-shaped movable walking frame, the repair process is carried out through a surfacing welding device of the 7-shaped movable walking frame wear surface of the wheel band rolling mill in the technical scheme, the 7-shaped movable walking frame is horizontally placed on a horizontal plane on one side of a structural member tool frame, then the whole body is moved to a welding field through a moving device, the structural member tool frame is adjusted through an adjusting screw of a lifting device, so that the structural member tool frame is fixed on the horizontal ground, the wear surfaces on two sides of the 7-shaped movable walking frame on the structural member tool frame are positioned at a horizontal welding position, and then welding repair is carried out according to the following steps;
s1, preparation before welding:
1.1 And welding equipment: a digitally controlled inversion type manual carbon dioxide gas shielded welding machine adopts an ER50-6 welding wire as a welding material, and the mixed gas is argon and carbon dioxide gas;
1.2 A heating device: heating the tool;
1.3 Auxiliary facilities): angle grinder, file, hammer, flat shovel, mask, sample plate, thermodetector, magnifier, and heat insulation cotton;
1.4 And weldment material: body ZG270-500;
1.5 And surfacing before welding requires: cleaning the worn surface by a manual angle grinder to remove rust, grease and moisture, and preheating by using a heating tool;
1.6 And welding position: horizontal transverse welding;
1.7 And welding requirements: all welding layers must be free of any welding defects and fused to the base material;
1.8 And welding process parameters: formulating welding parameters according to welding equipment, welding materials, weldment materials and welding requirements;
s2, welding implementation:
2.1 Cleaning the wear surfaces on the two sides of the 7-shaped movable walking frame through a manual angle grinder to remove rust, grease and moisture, and simultaneously preheating the wear surfaces on the two sides of the 7-shaped movable walking frame to a set temperature through a heating tool;
2.2 In surfacing, the wear surfaces on two sides are symmetrically surfaced by a digital control inverse manual carbon dioxide gas shielded welding machine, the bottom layer transverse seam is welded by a left-hand welding method, the included angle of the upper horizontal line and the lower horizontal line of a welding gun is 70-85 degrees, the inclination angle is 50-70 degrees, the transverse seam of the surface surfacing layer is surfacing by a right-hand welding method, and the included angle of the upper horizontal line and the lower horizontal line of the welding gun is 70-85 degrees, and the inclination angle is 50-70 degrees;
2.3 Each layer is controlled to be 2-4mm in surfacing, and the surface of a welding seam is detected layer by layer through visual inspection and a magnifier, so that whether welding defects exist is ensured;
2.4 After surfacing is finished, annealing heat treatment is carried out on the whole surfacing layer at 550-650 ℃ for 4 hours, and then the whole surfacing layer is wrapped by heat-insulating cotton and slowly cooled;
2.5 Detecting the surface of the surfacing layer by flaw detection, performing machining and manual grinding after no welding defect is confirmed, and checking and accepting through a sample plate to ensure that the repaired 7-shaped movable walking frame completely meets the operation and use requirements of the installation accessory and is put into use.
Further, the digital control inversion type manual carbon dioxide gas shielded welding machine is an NB-500 digital control inversion type manual carbon dioxide gas shielded welding machine, and the mixed gas is 80% of argon and 20% of carbon dioxide gas.
Furthermore, when the bottom layer is welded, the welding wire is an ER50-6 welding wire with the diameter of 1.0mm, the welding current is 200-250A, the arc voltage is 28 +/-1V, and the welding speed is 18 +/-1 cm/min; when the surfacing layer is used for welding, the electrode is an ER50-6 welding wire with the diameter of 1.2mm, the welding current is 260-300A, the arc voltage is 30 +/-1V, and the welding speed is 19 +/-1 cm/min.
Further, the bottom of the wearing surface on two sides of the 7-shaped movable walking frame is simultaneously preheated to a set temperature of 250-350 ℃ through a heating tool.
Compared with the prior art, the bead welding device and the bead welding repair process for the 7-shaped movable walking frame wear surface of the rim rolling mill have the advantages of simple structure, reasonable design, low manufacturing cost and convenience in use, are matched with a guiding deviation correction method, effectively eliminate welding stress by preheating the wear surface at 250-350 ℃ before welding repair and performing heat treatment at 550-650 ℃ for 4 hours after welding, avoid the generation of cold cracks during welding (the necessary condition of the cold cracks is that the concentration of hydrogen and a hardened structure cannot be released to generate stress concentration), reduce the Z-direction restraint force of the wear surface on the welding process by striving to select preheating and control welding heat input and the like, avoid layered tearing (the phenomenon mainly comes from the factors of welding Z-direction restraint force and heat affected zone hardening), and reduce the stress and deformation of the whole structure by symmetrically transversely welding the wear surface and controlling the bead welding layer to be 2-4mm (large-area bead welding generates large welding heat input to generate stress and deformation which cannot be released).
Drawings
FIG. 1 is a schematic structural view of a 7-shaped movable walking frame according to the present invention;
FIG. 2 is a schematic structural view of a bead welding device for a 7-shaped movable carriage wear surface of a rim rolling mill according to the present invention in use;
FIG. 3 is a schematic structural view of the front side of the bead welding device of the 7-shaped movable carriage wear surface of the rim rolling mill in use;
FIG. 4 is an explosion schematic diagram of the bead welding device for the 7-shaped movable carriage wear surface of the rim rolling mill in the invention;
in the figure: 1. a 7-shaped movable walking frame; 11. a wear surface; 2. a structural member tooling frame; 21. moving the roller; 22. a support block; 3. a lifting device; 31. adjusting the screw rod; 32. a screw seat; 4. heating the tool; 41. a 7-shaped gas pipe; 42. burning the nozzle; 43. a gas main pipe; 44. a gas interface.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The terms "upper", "lower", "left", "right", "front", "rear", "inner", "outer", "lateral", "longitudinal", and the like used in the specification and claims of the present disclosure are used only to indicate relative positional relationships, and when the absolute position of an object to be described is changed, the relative positional relationships are also changed accordingly. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The present invention is not described in detail, but is known to those skilled in the art.
Example 1:
fig. 1 shows a schematic structural diagram of a 7-shaped movable carriage 1 of a tyre rolling mill, wherein the structure of each large and small movable carriage on the tyre rolling mill is basically the same, the whole movable carriage is 7-shaped, and after long-term operation, wear surfaces 11 are formed on two sides.
As shown in fig. 2-4, the surfacing device for the 7-shaped movable walking frame wear surface of the rim rolling mill comprises a structural part tooling frame 2 and a heating tool 4, wherein the structural part tooling frame 2 is integrally rectangular, the structural part tooling frame 2 is used for horizontally placing a 7-shaped movable walking frame 1 to be repaired, and the structural part tooling frame is integrally frame-shaped and is matched with the 7-shaped movable walking frame 1; the structural part tooling frame 2 is provided with a moving device and a lifting device 3, the moving device is used for moving the 7-shaped movable walking frame 1 of the surfacing device to a welding area or moving the 7-shaped movable walking frame 1 which is welded and repaired out of the welding area, and generally, four moving rollers 21 can be symmetrically arranged on two sides of the bottom of the structural part tooling frame 2; for the convenience of the 7-shaped movable walking frame 1 to be in a horizontal position during welding repair, the supporting blocks 22 are symmetrically arranged at four corners of the structural member tooling frame 2 respectively, a threaded hole is formed in the center of each supporting block 22, each lifting device 3 comprises an adjusting screw 31 in the threaded hole of each supporting block 22 in a threaded connection mode, the bottom of each adjusting screw 31 is detachably or fixedly provided with a disc-shaped screw seat 32, the structural member tooling frame 2 is adjusted through the four adjusting screws 31, the wear surface 11, on which the 7-shaped movable walking frame 1 is placed, is in the horizontal position, meanwhile, the four movable rolling wheels 21 of the structural member tooling frame 2 are separated from the ground, and the stability of the wear surface 11 during welding repair is facilitated.
In this embodiment, for promoting the steadiness of whole device, structure frock frame 2 can be formed by 80mm thick steel sheet cutting process, and supporting shoe 22 can adopt 60mm steel sheet processing to form and weld on structure frock frame 2, and adjusting screw 31 can adopt phi 50mm pole machining to form.
In this embodiment, in order to facilitate preheating and postweld heat treatment during repair of the wear surface 11 of the 7-shaped movable carriage 1, the heating tool 4 includes a gas main pipe 43, a gas port 44 is arranged in the middle of the gas main pipe 43, two ends of the gas main pipe 43 are respectively communicated with the 7-shaped gas pipes 41, a plurality of burners 42 are uniformly distributed on each 7-shaped gas pipe 41, when the wear surface 11 of the 7-shaped movable carriage 1 is heated, gas is introduced into the gas main pipe 43, the gas flows into the two 7-shaped gas pipes 41 through the gas main pipe, and the wear surface 11 can be heated by igniting each burner 42.
Example 2:
the invention relates to a repair process of a 7-shaped movable walking frame wear surface of a rim rolling mill, wherein the wear surface 11 is positioned on two side surfaces of a 7-shaped movable walking frame 1, the repair process is carried out through a surfacing welding device of the 7-shaped movable walking frame wear surface of the rim rolling mill in the embodiment 1, the 7-shaped movable walking frame 1 is horizontally placed on a horizontal plane on one side of a structural member tool frame 2, then the whole body is moved to a welding field through a moving device, the structural member tool frame 2 is adjusted through an adjusting screw 31 of a lifting device 3, so that the structural member tool frame 2 is fixed on the horizontal ground, the wear surfaces 11 on two sides of the 7-shaped movable walking frame 1 on the structural member tool frame 2 are positioned at a horizontal welding position, and then welding repair is carried out according to the following steps;
s1, preparing before welding:
1.1 And welding equipment: an NB-500 digital control inversion type manual carbon dioxide gas shielded welding machine adopts an ER50-6 welding wire as a welding material, and the mixed gas is argon and carbon dioxide gas (80% of argon and 20% of carbon dioxide gas);
1.2 A heating device: heating the tool 4;
1.3 Auxiliary facilities): angle grinder, file, hammer, flat shovel, mask, sample plate, thermodetector, magnifier, and heat insulation cotton;
1.4 Raw materials of weldments): the body ZG270-500;
1.5 And the surfacing before welding requires that: cleaning the worn surface by a manual angle grinder to remove rust, grease and water, and preheating by using a heating tool 4;
1.6 Host), welding position: horizontal transverse welding;
1.7 And welding requirements: all welding layers must be free of any welding defects and fused to the base material;
1.8 And welding process parameters: formulating welding parameters according to welding equipment, welding materials, weldment materials and welding requirements;
welding process parameters
S2, welding implementation:
the implementation process technical route comprises the following steps: installing and adjusting a surfacing device of a 7-shaped movable walking frame wear surface of a wheel band rolling mill, horizontally positioning a surfacing layer, cleaning the surface of the surfacing layer, preheating, surfacing, welding the thickness of a welding seam, performing postweld heat treatment, inspecting the surfacing layer, mechanically roughing and finely machining the surfacing layer, partially manually grinding and finely machining, delivering for use, and periodically verifying. The method specifically comprises the following steps:
2.1 Cleaning the wear surfaces 11 on the two sides of the 7-shaped movable walking frame 1 by a manual angle grinder to remove rust, grease and moisture, and simultaneously preheating the bottoms of the wear surfaces 11 on the two sides of the 7-shaped movable walking frame 1 to a set temperature through a heating tool 4, wherein the set temperature is usually 250-350 ℃, so that the large stress concentration generated in the welding process of the 7-shaped movable walking frame 1 with large thickness at the bottom of a surfacing layer is avoided, cold cracks after welding are caused, and in addition, the preheating realizes the metallurgical combination of the fusion performance of the bottom layer and a surfacing material;
2.2 In the process of overlaying welding, the wear surfaces 11 on two sides are symmetrically overlaid by adopting an NB-500 digital control inverse manual carbon dioxide gas shielded welding machine simultaneously, so that the stress and the deformation generated by large-area overlaying welding are reduced, a left-hand welding method is adopted for welding the transverse seam of the bottom layer, the included angle between the upper horizontal line and the lower horizontal line of a welding gun is 70-85 degrees, the inclination angle is 50-70 degrees, the transverse seam of the surface overlaying welding layer is overlaid by a right-hand welding method, the included angle between the upper horizontal line and the lower horizontal line of the welding gun is 70-85 degrees, the inclination angle is 50-70 degrees, therefore, the integral welding seam not only avoids various welding defects of incomplete fusion, slag inclusion and the like of the overlaying welding layer, but also is beneficial to the wear resistance of the wear surfaces;
2.3 Each layer is controlled to be 2-4mm, and the surface of a welding seam is detected layer by layer through visual inspection and a 5-time magnifier, so that no welding defect is ensured;
2.4 After surfacing is finished completely, annealing heat treatment is carried out on the whole surfacing layer for 4 hours at the temperature of 550-650 ℃, and then the whole surfacing layer is slowly cooled by adopting heat-insulating cotton bundling, so that not only can residual welding stress and large deformation be reduced, but also the welding quality of the surfacing layer can be ensured;
2.5 Detecting the surface of the surfacing layer by flaw detection, carrying out machining and manual grinding after confirming that no welding defect exists, and then checking and accepting through a sample plate to ensure that the repaired 7-shaped movable walking frame 1 is delivered after completely meeting the operation and use requirements of the installation matching parts.
Claims (9)
1. The utility model provides a bead welding device of portable walking frame wearing and tearing face of rim of a tyre rolling machine "7" style of calligraphy which characterized in that: the heating device comprises a structural part tool frame (2) and a heating tool (4), wherein the structural part tool frame (2) is integrally rectangular, and a moving device and a lifting device (3) are arranged on the structural part tool frame (2); four corners of structure frock frame (2) are the symmetry respectively and are provided with supporting shoe (22), and supporting shoe (22) center department sets up threaded hole, elevating gear (3) are including threaded connection in supporting shoe (22) threaded hole adjusting screw (31), and the bottom of adjusting screw (31) can be dismantled or fixed be provided with discoid screw rod seat (32).
2. The bead welding device for the 7-shaped movable walking frame wear surface of the rim rolling machine according to claim 1, characterized in that: the moving device is four moving rollers (21) symmetrically arranged on two sides of the bottom of the structural part tooling frame (2).
3. The bead welding device for the 7-shaped movable walking frame wear surface of the rim rolling machine according to claim 1, characterized in that: the heating tool (4) comprises a gas main pipe (43), a gas interface (44) is arranged in the middle of the gas main pipe (43), two ends of the gas main pipe (43) are respectively communicated with 7-shaped gas pipes (41), and a plurality of burners (42) are uniformly distributed on each 7-shaped gas pipe (41).
4. The bead welding device for the 7-shaped movable carriage wear surface of the rim rolling mill according to claim 1, characterized in that: the structural part tool frame (2) is formed by cutting and processing a steel plate with the thickness of 80 mm.
5. The bead welding device for the 7-shaped movable carriage wear surface of the rim rolling mill according to claim 2, characterized in that: the supporting block (22) is formed by machining a steel plate with the thickness of 60mm and welded at the corner of the structural part tooling frame (2), and the adjusting screw rod (31) is formed by machining a round rod with the diameter of 50 mm.
6. The utility model provides a repair technology of portable carriage wearing surface of rim rolling mill "7" style of calligraphy, wearing surface (11) are located the both sides face of portable carriage (1) of "7" style of calligraphy, its characterized in that: the bead welding device for the 7-shaped movable walking frame wear surface of the wheel band rolling mill according to any one of claims 1 to 5 is carried out, the 7-shaped movable walking frame (1) is horizontally placed on the horizontal plane on one side of the structural member tooling frame (2), then the whole is moved to a welding field through a moving device, the structural member tooling frame (2) is adjusted through an adjusting screw rod (31) of a lifting device (3), so that the structural member tooling frame (2) is fixed on a horizontal ground, the wear surfaces (11) on two sides of the 7-shaped movable walking frame (1) on the structural member tooling frame (2) are in a horizontal welding position, and then welding repair is carried out according to the following steps;
s1, preparation before welding:
1.1 And welding equipment: a digitally controlled inversion type manual carbon dioxide gas shielded welding machine adopts an ER50-6 welding wire as a welding material, and the mixed gas is argon and carbon dioxide gas;
1.2 A heating device: heating the tool (4);
1.3 Auxiliary facilities): angle grinder, file, hammer, flat shovel, mask, sample plate, thermodetector, magnifier, and heat insulation cotton;
1.4 Raw materials of weldments): body ZG270-500;
1.5 And the surfacing before welding requires that: cleaning the worn surface by a manual angle grinder to remove rust, grease and moisture, and preheating by using a heating tool (4);
1.6 And welding position: horizontal transverse welding;
1.7 And welding requirements: all welding layers must be free of any welding defects and fused to the base material;
1.8 And welding process parameters: setting welding parameters according to welding equipment, welding materials, weldment materials and welding requirements;
s2, welding implementation:
2.1 Cleaning the wear surfaces (11) on the two sides of the 7-shaped movable walking frame (1) through a manual angle grinder to remove rust, grease and moisture, and simultaneously preheating the bottoms of the wear surfaces (11) on the two sides of the 7-shaped movable walking frame (1) to a set temperature through a heating tool (4);
2.2 In surfacing, wear surfaces (11) on two sides are simultaneously subjected to symmetrical surfacing by adopting a digital control inverse manual carbon dioxide gas shielded welding machine, a left-hand welding method is adopted for welding a transverse seam at the bottom layer, the vertical horizontal included angle of a welding gun is 70-85 degrees, the inclination angle is 50-70 degrees, the transverse seam of a surface surfacing layer is surfacing by a right-hand welding method, and the vertical horizontal included angle of the welding gun is 70-85 degrees, and the inclination angle is 50-70 degrees;
2.3 Each layer is controlled to be 2-4mm, and the welding seam surface is detected layer by layer through visual inspection and a magnifier to ensure whether welding defects exist;
2.4 After surfacing is finished, annealing heat treatment is carried out on the whole surfacing layer at 550-650 ℃ for 4 hours, and then the whole surfacing layer is wrapped by heat-insulating cotton and slowly cooled;
2.5 Detecting the surface of the surfacing layer by flaw detection, carrying out mechanical processing and manual grinding after confirming that no welding defect exists, and then checking and accepting through a sample plate to ensure that the repaired 7-shaped movable walking frame (1) is delivered after completely meeting the operation and use requirements of the installation matching parts.
7. The repair process of the 7-shaped movable carriage wear surface of the rim rolling mill as claimed in claim 6, wherein: the digital control inversion type manual carbon dioxide gas shielded welding machine is an NB-500 digital control inversion type manual carbon dioxide gas shielded welding machine, and the mixed gas is 80% of argon and 20% of carbon dioxide gas.
8. The repair process of the wear surface of the 7-shaped movable carriage of the rim rolling mill as claimed in claim 6, wherein: when the bottom layer is welded, the welding wire adopts an ER50-6 welding wire with the diameter of 1.0mm, the welding current is 200-250A, the arc voltage is 28 +/-1V, and the welding speed is 18 +/-1 cm/min; when the surfacing layer is used for welding, the electrode is an ER50-6 welding wire with the diameter of 1.2mm, the welding current is 260-300A, the arc voltage is 30 +/-1V, and the welding speed is 19 +/-1 cm/min.
9. The repair process of the 7-shaped movable carriage wear surface of the rim rolling mill as claimed in claim 6, wherein: the bottom parts of the wearing surfaces (11) at the two sides of the 7-shaped movable walking frame (1) are simultaneously preheated to a set temperature of 250-350 ℃ by the heating tool (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211512100.3A CN115740954A (en) | 2022-11-29 | 2022-11-29 | Overlaying device and repairing process for 7-shaped movable walking frame wear surface of wheel band rolling mill |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211512100.3A CN115740954A (en) | 2022-11-29 | 2022-11-29 | Overlaying device and repairing process for 7-shaped movable walking frame wear surface of wheel band rolling mill |
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| CN115740954A true CN115740954A (en) | 2023-03-07 |
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| CN202211512100.3A Pending CN115740954A (en) | 2022-11-29 | 2022-11-29 | Overlaying device and repairing process for 7-shaped movable walking frame wear surface of wheel band rolling mill |
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| CN (1) | CN115740954A (en) |
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- 2022-11-29 CN CN202211512100.3A patent/CN115740954A/en active Pending
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