Wheel rim rolling machine "7" type mobile walking frame wear surface welding device and repair process

Abstract

The application discloses a kind of wheel rim rolling mill "7" type movable walking frame wear surface surfacing device and repair process, the surfacing device includes the structure member tool holder of overall rectangular parallelepiped and heating tool, mobile device and lifting device are provided on the structure member tool holder;Four corners of the structure member tool holder are respectively symmetrically provided with support block, and threaded hole is formed in the center of support block, the lifting device includes the adjusting screw rod that is screw-connected in the threaded hole of support block, and the bottom of adjusting screw rod is detachably or fixedly provided with disc-shaped screw rod seat, cooperate the repair process, can effectively repair the wear surface of wheel rim rolling mill "7" type movable walking frame, low investment cost, short maintenance time, good repair effect, can provide guarantee for the orderly operation of rolling mill.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of machinery, and relates to a wheel rim rolling mill "7" type movable walking frame wear surface hardfacing device and repair process. BACKGROUND

[0002] The rough rolling mill is a special equipment for rolling train wheel rim, various ring-shaped parts, gear blank, crane wheel and rolling bearing inner and outer rings, etc., which is usually composed of a base, a movable large walking frame, a movable small walking frame, a mechanical transmission system and a high-pressure water control system, etc. The movable large walking frame or the movable small walking frame is usually in the shape of "7", as shown in the figure, and the wall thickness of the rolled piece is controlled through the pinch roll installed on the large or small "7" type movable walking frame. Due to long-term rolling of the rough rolling mill, the large and small "7" type movable walking frames moving forward and backward continuously wear on both sides, and as the wear surface becomes larger and larger, the rolling process requirements cannot be met. If the large and small "7" type movable walking frames are replaced as a whole, a large amount of procurement cost will be wasted, and if the off-line repair is carried out by the outsourcing manufacturer, the cycle is long, which affects the orderly development of rolling production; if the enterprise implements the body wear additive hardfacing for the wear surface, it is necessary to ensure that there are no cracks and porosity defects in the MT and PT penetration inspection, and then the mechanical and manual grinding is carried out to restore the drawing size and precision. The material of the large walking frame and the small walking frame is ZG270-500, and the weldability of such material is good, but the main problems in the welding repair are that the large walking frame and the small walking frame are easy to produce welding cold cracks, laminar tearing and hardfacing layer thickness control when the welding thickness is more than 150 mm. Figure 1 SUMMARY

[0003] In view of the problems in the background art, the present application provides a wheel rim rolling mill "7" type movable walking frame wear surface hardfacing device and repair process, which solves the technical problems in the technical scheme as follows:

[0004] The wheel rim rolling mill "7" type movable walking frame wear surface hardfacing device comprises a structure piece tool holder in the shape of a cuboid and a heating tool, a moving device and a lifting device are arranged on the structure piece tool holder; support blocks are symmetrically arranged at four corners of the structure piece tool holder, threaded holes are formed in the centers of the support blocks, the lifting device comprises an adjusting screw threadedly connected to the threaded hole of the support block, and a disc-shaped screw seat is detachably or fixedly arranged at the bottom of the adjusting screw.

[0005] Further, the moving device is four moving rollers symmetrically arranged at the bottom of the structure piece tool holder.

[0006] ​Further, the heating tooling includes a gas main pipe, a gas interface is arranged in the middle of the gas main pipe, and a "7" type gas pipe is arranged in communication at both ends of the gas main pipe, and a plurality of burners are arranged on each "7" type gas pipe.

[0007] Further, the structural part tooling frame is cut and processed from a 80mm thick steel plate.

[0008] Further, the supporting block is processed from a 60mm thick steel plate and is welded at the corner of the structural part tooling frame, and the adjusting screw is mechanically processed from a φ50mm round bar.

[0009] The present application discloses a kind of wheel rim rolling mill "7" type movable walking frame wear surface repair process, the wear surface is located at the both sides of the "7" type movable walking frame, by the welding device of the wheel rim rolling mill "7" type movable walking frame wear surface in the above technical scheme, first "7" type movable walking frame is horizontally placed on the horizontal plane of structural part tooling frame side, then by moving device whole is moved to welding site, then by the adjusting screw of lifting device, structural part tooling frame is adjusted, so that structural part tooling frame is fixed on horizontal ground and the wear surface of "7" type movable walking frame placed on structural part tooling frame both sides is in horizontal welding position, then welding repair is carried out according to the following steps:

[0010] S1, welding preparation:

[0011] 1.1), welding equipment: digital control inverter type manual carbon dioxide gas shielded welding machine, welding material uses ER50-6 welding wire, and mixed gas is argon and carbon dioxide gas;

[0012] 1.2), heating device: heating tooling;

[0013] 1.3), auxiliary facilities: angle grinder, file, hammer, flat shovel, mask, sample plate, temperature measuring instrument, magnifying glass, heat preservation cotton;

[0014] 1.4), welding material: body ZG270-500;

[0015] 1.5), welding requirement before welding: wear surface is cleaned by hand angle grinder to remove rust, grease and moisture, and preheating is carried out using heating tooling;

[0016] 1.6), welding position: horizontal transverse welding;

[0017] 1.7), welding requirement: all welding layers must be free of any welding defects and fused to base material;

[0018] 1.8), welding process parameters: welding parameters are determined according to welding equipment, welding material, welding material quality and welding requirement;

[0019] S2, welding implementation:

[0020] 2.1), by hand angle grinder cleaning "7" type mobile walking frame both sides of the wear surface to remove rust, grease and moisture, by heating tool respectively in the "7" type mobile walking frame both sides of the wear surface bottom preheating to the set temperature at the same time;

[0021] 2.2), when surfacing, both sides of the wear surface simultaneously using digital control inverter type manual carbon dioxide gas shielded welding machine for symmetrical surfacing, the bottom layer of transverse seam welding using left welding method, the horizontal angle of the welding torch is 70-85°, the inclination angle is 50-70°, the surface surfacing layer transverse seam is right welding method, the horizontal angle of the welding torch is 70-85°, the inclination angle is 50-70°;

[0022] 2.3), each layer of surfacing is controlled in 2-4mm, the weld surface is detected by visual inspection and magnifying glass to ensure that there is no welding defect;

[0023] 2.4), after the surfacing is completed, the whole surfacing layer is annealed at 550-650℃ for 4 hours, and then is slowly cooled by using insulation cotton;

[0024] 2.5), the surfacing layer surface is detected by flaw detection, after confirming that there is no any welding defect, mechanical processing and hand grinding are carried out, and then the sample plate is inspected and accepted, after ensuring that the repaired "7" type mobile walking frame completely meets the operation requirements of the installed matching components, the repaired "7" type mobile walking frame is delivered for use.

[0025] Further, the digital control inverter type manual carbon dioxide gas shielded welding machine is NB-500 digital control inverter type manual carbon dioxide gas shielded welding machine, and the mixed gas is 80% argon and 20% carbon dioxide gas.

[0026] Further, during the bottom layer welding, the welding wire is ER50-6 welding wire with a diameter of 1.0mm, the welding current is 200-250A, the arc voltage is 28±1V, and the welding speed is 18±1cm / min; during the surfacing layer welding, the welding rod is ER50-6 welding wire with a diameter of 1.2mm, the welding current is 260-300A, the arc voltage is 30±1V, and the welding speed is 19±1cm / min.

[0027] Further, the set temperature of the heating tool respectively in the "7" type mobile walking frame both sides of the wear surface bottom preheating to at the same time is 250-350℃.

[0028] Compared with the prior art, the "7" type movable walking frame wear surface overlaying device and repair process of the wheel rim rolling mill has the advantages of simple structure, reasonable design, low manufacturing cost, convenient use, and the like. In combination with the guiding and correcting method, the wear surface is preheated at 250-350 DEG C before welding repair, and heat treatment at 550 DEG C-650 DEG C for 4 hours after welding, so as to effectively eliminate welding stress and avoid the generation of cold cracks (the necessary condition for cold cracks is the concentration of hydrogen and the existence of hardening structure which cannot be released to cause stress concentration). By striving to reduce the Z-direction restraint force in the welding process, and selecting preheating and controlling welding heat input, layered tearing is avoided (the phenomenon mainly comes from the factors of Z-direction restraint force and heat affected zone hardening). By symmetric transverse welding of the wear surface and controlling the overlaying layer at 2-4 mm (large area overlaying generates large welding heat input to cause stress and deformation which cannot be released), the stress and deformation amount of the overall structure are reduced. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a structure schematic view of the "7" type movable walking frame in the application.

[0030] Figure 2 It is a structure schematic view of the "7" type movable walking frame wear surface overlaying device in use in the application.

[0031] Figure 3 It is a front structure schematic view of the "7" type movable walking frame wear surface overlaying device in use in the application.

[0032] Figure 4 It is an explosion schematic view of the "7" type movable walking frame wear surface overlaying device in use in the application.

[0033] In the figure: 1, "7" type movable walking frame; 11, wear surface; 2, structure part tooling frame; 21, moving roller; 22, supporting block; 3, lifting device; 31, adjusting screw; 32, screw seat; 4, heating tool; 41, "7" type gas pipe; 42, burner; 43, gas main pipe; 44, gas interface. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the application.

[0035] Unless otherwise defined, the technical or scientific terms used herein shall have the usual meanings understood by persons of ordinary skill in the field to which the present disclosure belongs. The terms "upper", "lower", "left", "right", "front", "back", "inside", "outside", "horizontal", "vertical", etc. used in the present patent application specification and claims are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship also changes accordingly. Similar terms such as "connected" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Anything not described in detail in the present invention is a common knowledge to those skilled in the art.

[0036] Example 1:

[0037] Figure 1 The structure diagram of the "7"-shaped movable carriage 1 of the wheel rim rolling mill is shown. The structures of the large and small movable carriages on the wheel rim rolling mill are basically the same. The overall shape is "7". After long-term operation, wear surfaces 11 are formed on both sides.

[0038] like Figures 2-4 As shown, the present invention is a surfacing welding device for the worn surface of a "7"-shaped movable carriage of a wheel rim rolling mill, which includes a structural member fixture frame 2 and a heating fixture 4 in an overall rectangular parallelepiped shape. The structural member fixture frame 2 is used to horizontally place the "7"-shaped movable carriage 1 to be repaired, and its overall structure is frame-shaped and adapted to the "7"-shaped movable carriage 1; a moving device and a lifting device 3 are provided on the structural member fixture frame 2, and the moving device is used to move the "7"-shaped movable carriage 1 of the surfacing welding device to a welding area or to move the welded and repaired "7"-shaped movable carriage 1 out of the welding area. Usually, four moving rollers 21 can be symmetrically provided on both sides of the bottom of the structural member fixture frame 2; In order to facilitate the "7"-shaped movable carriage 1 to be in a horizontal position during welding repair, support blocks 22 are symmetrically arranged at the four corners of the structural part fixture frame 2, and a threaded hole is opened at the center of the support block 22. The lifting device 3 includes an adjusting screw 31 threadedly connected to the threaded hole of the support block 22. The bottom of the adjusting screw 31 is detachably or fixedly provided with a disc-shaped screw seat 32. The structural part fixture frame 2 is adjusted by the four adjusting screws 31 so that the wear surface 11 of the "7"-shaped movable carriage 1 placed thereon is in a horizontal position. At the same time, the four movable rollers 21 of the structural part fixture frame 2 are separated from the ground, which facilitates the stability of the wear surface 11 during welding repair.

[0039] In this embodiment, in order to improve the stability of the entire device, the structural component fixture frame 2 can be cut and processed from 80mm thick steel plate, the support block 22 can be processed from 60mm steel plate and welded to the structural component fixture frame 2, and the adjusting screw 31 can be machined from a φ50mm round bar.

[0040] In the embodiment, in order to facilitate preheating and post-weld heat treatment when repairing the wear surface 11 of the "7"-shaped mobile walking frame 1, the heating tool 4 comprises a gas main pipe 43, a gas interface 44 is arranged at the middle part of the gas main pipe 43, and two "7"-shaped gas pipes 41 are respectively arranged at the two ends of the gas main pipe 43 in a communication mode, a plurality of burners 42 are uniformly arranged on each "7"-shaped gas pipe 41, and when the wear surface 11 of the "7"-shaped mobile walking frame 1 is heated, gas is supplied 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.

[0041] Embodiment 2:

[0042] The repair process of the wear surface of the "7"-shaped mobile walking frame of the wheel rim rolling mill, the wear surface 11 is located on the two side surfaces of the "7"-shaped mobile walking frame 1, and is carried out by the surfacing device for the wear surface of the "7"-shaped mobile walking frame of the wheel rim rolling mill in embodiment 1. First, the "7"-shaped mobile walking frame 1 is horizontally placed on one side of the horizontal surface of the structural tool holder 2, then the whole is moved to the welding site through the moving device, then the adjusting screw 31 of the lifting device 3 is adjusted to fix the structural tool holder 2 on the horizontal ground, and the wear surfaces 11 on the two sides of the "7"-shaped mobile walking frame 1 placed on the structural tool holder 2 are in a horizontal welding position, then welding repair is carried out according to the following steps.

[0043] S1, welding preparation:

[0044] 1.1), welding equipment: NB-500 digital control inverter type manual carbon dioxide gas shielded welding machine, welding material uses ER50-6 welding wire, and the mixed gas is argon and carbon dioxide gas (80% argon and 20% carbon dioxide gas);

[0045] 1.2), heating device: heating tool 4;

[0046] 1.3), auxiliary facilities: angle grinder, file, hammer, flat shovel, mask, template, temperature measuring instrument, magnifying glass, heat preservation cotton;

[0047] 1.4), welding material: body ZG270-500;

[0048] 1.5), welding requirement before welding: the wear surface is cleaned by a manual angle grinder to remove rust, grease and moisture, and the heating tool 4 is used for preheating;

[0049] 1.6), welding position: horizontal transverse welding;

[0050] 1.7), welding requirement: all welding layers must be free of any welding defects and fused to the base material;

[0051] 1.8) Welding process parameters: welding parameters are determined according to welding equipment, welding materials, welding material quality and welding requirements;

[0052] Welding process parameters

[0053]

[0054] S2, welding implementation:

[0055] Implementation process technology route: install the welding device of the "7" type mobile walking frame wear surface - the horizontal position of the welding layer - clean the surface of the welding layer - preheat - welding - welding method - weld thickness - post-weld heat treatment - welding layer inspection - mechanical roughing and finishing of the welding layer - local manual polishing finishing - delivery for use - cycle verification. Specifically:

[0056] 2.1) Clean the wear surfaces 11 on both sides of the "7" type mobile walking frame 1 by hand angle grinder to remove rust, grease and moisture, and preheat the bottom of the wear surfaces 11 on both sides of the "7" type mobile walking frame 1 to a set temperature of 250-350°C by heating tool 4 at the same time, which usually avoids large stress concentration at the bottom of the welding layer during welding of the large thickness "7" type mobile walking frame 1, resulting in cold cracks after welding, and also preheats the bottom layer to improve the metallurgical bonding of the welding layer;

[0057] 2.2) When welding, the wear surfaces 11 on both sides are simultaneously symmetrically welded using the NB-500 digital control inverter type manual carbon dioxide gas shielded welding machine, which reduces the stress and deformation caused by large area welding, and the bottom layer uses leftward welding method with a horizontal angle of 70-85° and an inclination angle of 50-70°, and the surface welding layer uses rightward welding method with a horizontal angle of 70-85° and an inclination angle of 50-70°, which not only avoids various welding defects such as incomplete fusion and slag inclusion in the welding layer, but also is beneficial to the wear resistance of the wear surface;

[0058] 2.3) Control the thickness of each layer of welding to be 2-4mm, and detect the welding surface by visual inspection and 5 times magnifying glass to ensure that there are no welding defects;

[0059] 2.4) After the entire welding layer is completed, perform annealing heat treatment at 550-650°C for 4 hours, and then use insulation cotton to slow down the cooling, which not only reduces the residual welding stress and large deformation, but also ensures the welding quality of the welding layer;

[0060] 2.5) After the surface of the surfacing layer is detected by flaw detection and no welding defects are found, mechanical processing and manual grinding are performed, and then the repaired "7" shaped mobile gantry 1 is delivered for use after being accepted by template inspection to ensure that it fully meets the operation requirements of its installed matching components.

Claims

1. A surfacing welding device for the wear surface of a "7"-shaped movable carriage of a wheel tire rolling mill, characterized by: It comprises a structural member fixture frame (2) and a heating fixture (4) in the shape of a rectangular parallelepiped as a whole, wherein a moving device and a lifting device (3) are provided on the structural member fixture frame (2); support blocks (22) are symmetrically provided at the four corners of the structural member fixture frame (2), a threaded hole is provided at the center of the support block (22), and the lifting device (3) comprises an adjusting screw (31) threadedly connected to the threaded hole of the support block (22), and a disc-shaped screw seat (32) is detachably or fixedly provided at the bottom of the adjusting screw (31); The moving device is four moving rollers (21) symmetrically arranged on both sides of the bottom of the structural component fixture frame (2); The heating tool (4) includes a gas main pipe (43), a gas interface (44) is provided in the middle of the gas main pipe (43), and both ends of the gas main pipe (43) are connected to "7"-shaped gas pipes (41), and each "7"-shaped gas pipe (41) is evenly distributed with a plurality of burners (42); The structural component fixture frame (2) is cut and processed from 80mm thick steel plates; The support block (22) is machined from a 60 mm thick steel plate and welded to the corner of the structural member fixture frame (2), and the adjusting screw (31) is machined from a φ50 mm round bar.

2. A repair process for the wear surface of a "7"-shaped movable carriage of a wheel rim rolling mill, wherein the wear surface (11) is located on both sides of the "7"-shaped movable carriage (1), and is characterized in that: The surfacing welding device for the wear surface of the "7"-shaped movable carriage of the wheel rim rolling mill as claimed in claim 1 is used. First, the "7"-shaped movable carriage (1) is horizontally placed on a horizontal surface on one side of the structural component fixture frame (2). Then, the entire structure is moved to the welding site by the moving device. Then, the structural component fixture frame (2) is adjusted by the adjusting screw (31) of the lifting device (3), so that the structural component fixture frame (2) is fixed on the horizontal ground and the wear surfaces (11) on both sides of the "7"-shaped movable carriage (1) placed on the structural component fixture frame (2) are in a horizontal welding position. Then, the welding repair is performed according to the following steps; S1. Preparation before welding: 1.1) Welding equipment: digitally controlled inverter manual carbon dioxide gas shielded welding machine, welding material: ER50-6 welding wire, mixed gas: argon and carbon dioxide gas; 1.2) Heating device: heating tool (4); 1.3) Auxiliary facilities: angle grinder, file, hammer, flat shovel, mask, sample, thermometer, magnifying glass, thermal insulation cotton; 1.4), weldment material: body ZG270-500; 1.5) Requirements for pre-welding: Clean the worn surface with a manual angle grinder to remove rust, grease, and moisture, and preheat with a heating tool (4); 1.6) Welding position: horizontal welding; 1.7) Welding requirements: All weld layers must be free of any welding defects and fused to the parent material; 1.8) Welding process parameters: Welding parameters are determined based on welding equipment, welding materials, weldment materials and welding requirements; S2. Welding implementation: 2.1) Clean the wear surfaces (11) on both sides of the "7"-shaped movable frame (1) with a manual angle grinder to remove rust, grease and moisture, and preheat the bottoms of the wear surfaces (11) on both sides of the "7"-shaped movable frame (1) to the set temperature simultaneously with the heating tool (4); 2.2) During surfacing welding, the wear surfaces (11) on both sides are simultaneously symmetrically surfacing welded using a digitally controlled inverter manual carbon dioxide gas shielded welding machine. The bottom transverse seam is welded using a left-hand welding method, with the welding gun having a horizontal angle of 70-85° and an inclination of 50-70°. The surface surfacing layer transverse seam is welded using a right-hand welding method, with the welding gun having a horizontal angle of 70-85° and an inclination of 50-70°. 2.3) Each layer of surfacing welding should be controlled within 2-4mm, and the weld surface should be inspected visually and with a magnifying glass to ensure there are no welding defects. 2.4) After all the surfacing welding is completed, the entire surfacing layer is subjected to annealing heat treatment at 550℃-650℃ for 4 hours, and then wrapped with insulation cotton and slowly cooled; 2.5) After inspecting the surface of the weld overlay layer by flaw detection and confirming that there are no welding defects, it is machined and manually ground, and then inspected and accepted by the sample to ensure that the repaired "7"-shaped mobile walking frame (1) fully meets the requirements for the operation and use of its installed supporting components before it is delivered for use.

3. The repair process for the worn surface of the "7"-shaped movable carriage of a tire rolling mill according to claim 2, characterized in that: The digitally controlled inverter manual carbon dioxide gas shielded welding machine is a NB-500 digitally controlled inverter manual carbon dioxide gas shielded welding machine, and the mixed gas is 80% argon gas and 20% carbon dioxide gas.

4. The repair process for the worn surface of a "7"-shaped movable carriage of a tire rolling mill according to claim 2, characterized in that: When welding the bottom layer, the welding wire is ER50-6 welding wire with a diameter of 1.0 mm, the welding current is 200~250A, the arc voltage is 28±1V, and the welding speed is 18±1cm / min; when welding the surfacing layer, the welding rod is ER50-6 welding wire with a diameter of 1.2 mm, the welding current is 260~300A, the arc voltage is 30±1V, and the welding speed is 19±1cm / min.

5. The repair process for the worn surface of the "7"-shaped movable carriage of a tire rolling mill according to claim 2 is characterized by: The bottoms of the wear surfaces (11) on both sides of the "7"-shaped movable carriage (1) are simultaneously preheated to a set temperature of 250-350°C by using a heating tool (4).

Images