CN118699641A - A surfacing welding device and surfacing welding process for surface repair of infinitely cold cast iron substrate - Google Patents

Abstract

The invention relates to a material surface strengthening technology, in particular to surfacing equipment and surfacing technology for repairing the surface of an infinite chilled cast iron base material. The roller body is preheated, compared with the conventional manual winding package, the safety and reliability are improved through the package preheating treatment of automatic equipment, the welding wire is conveyed in a servo mode through the conveying structure and heated along the way by utilizing the advanced preheating treatment of the welding wire, and the welding operability is guaranteed. The heating body is driven to rotate by the rotating motor, and the heating body is eccentrically distributed to automatically deflect in the rotating process, and finally, the circuit is closed by utilizing the magnet adsorption, so that the interlayer temperature can be controlled in a proper range, and the interlayer bonding strength is ensured. The two groups of heating bodies are respectively positioned at two sides of the welding bead, only one group of heating bodies can be opened, and the heating bodies consistent with the walking direction of the walking mechanism are kept in an opened state. After the single-layer welding is finished, the clamping mechanism and the travelling mechanism work reversely and build up welding treatment is carried out along the weld bead seam of the upper layer, so that the welding layer is ensured to have no anisotropy.

Description

A surfacing welding device and surfacing welding process for surface repair of infinitely cold cast iron substrate

This application is a divisional application of the invention application entitled "Infinitely cold-hardened cast iron substrate surfacing wire and substrate surface repair process", application number CNCN202311853789.0, and application date December 29, 2023.

Technical Field

The invention relates to a material surface strengthening technology, in particular to a surfacing welding device and a surfacing welding process for infinitely chilled cast iron substrate surface repair.

Background Art

The working roll body is made of high-speed steel + roll neck material (high nickel-chromium infinitely cold hardened cast iron). The roll neck repair part is the bearing gear that is severely worn during use. After the roll neck is offline, the neck needs to be restored to the drawing size. Conventional surface strengthening technologies such as flame quenching, high and medium frequency quenching, plasma spraying, spray welding and arc surfacing cannot effectively improve the high temperature wear resistance and thermal fatigue resistance of the roll surface.

In the prior art, the spray ceramic alloying technology is used to treat the roller, the purpose is to improve the hardness and high temperature wear resistance of the roller working layer. The treatment effect of the laser/thermal spray alloying technology is closely related to the formula selection of the alloy powder. At present, the prior art mostly adds hard alloy powder, such as SiC, WC, TiC, etc., or generates metal compounds such as carbides, nitrides, borides, etc. in situ during the spray surface alloying process to enhance the wear resistance of the alloy coating. Although a high hardness and high wear resistance alloy layer can be formed on the surface of the steel material, the service life of the roller can be improved to a certain extent. However, because the formula selection is not reasonable enough, there are through cracks and pores when applied to cast iron materials, which seriously affects the surface quality of the alloy layer. Its service life and technical effect are not ideal, especially in the large-area roller application is still in the experimental exploration stage. The biggest problem currently exists that the alloy layer is easy to fall off during the rolling process. At the same time, high nickel-chromium infinite cold hard cast iron has alloy elements such as nickel, chromium, and molybdenum inside, and the weldability is relatively poor. It is very difficult to use ordinary surfacing technology.

Summary of the invention

The technical problem to be solved by the present invention is: how to solve the problem that cracks and sand holes are prone to occur when spraying repairs on the surface of high-nickel-chromium unlimited cold-hardened cast iron, and that ordinary surfacing processes cannot complete high-quality repairs. The prior art lacks special surfacing equipment for repairing the surface of high-nickel-chromium unlimited cold-hardened cast iron substrates.

In order to solve the above technical problems, the inventors have obtained the technical solution of the present invention through practice and summary. The present invention adopts the following technical solution:

Infinitely chilled cast iron substrate surfacing welding wire, the components of the welding wire include, by mass fraction: C: 0.05-0.15, Cr: 13-21.5, Mn: 1-10, Ni: 0-3, Si: 0.2-1.3, Mo≤0.01, P≤0.03, S≤0.03, the balance is Fe and trace impurities, C=n*Si,n=(0.11-0.25), 0.02≤Mn/(Cr+Fe)≤0.08.

Preferably, the components of the welding wire include, by mass fraction: C: 0.05-0.12, Cr: 16-19.5, Mn: 2-6, Ni: 0-2, Si: 0.2-0.5, Mo≤0.01, P≤0.03, S≤0.03, the remainder is Fe and trace impurities, C=n*Si,n=(0.11-0.25), 0.03≤Mn/(Cr+Fe)≤0.07.

Preferably, the welding wire comprises a nanocomposite coating coated and dried on the outside of the welding wire, and the components of the nanocomposite coating include 3-4 parts of nano alloy powder, 0.5-1 parts of n-butyl titanate and 6-7 parts of basic solvent by mass fraction.

Preferably, the components of the nano alloy powder include, by mass fraction: Ti: 80-90, Gd: 5-15, La: 5-15, Y2O3: 0-5, nano carbon black: 2-5; the basic solvent is one or more of alcohol solvents, alcohol ether solvents, ester solvents and ketone solvents.

A surface repair process for an infinitely chilled cast iron substrate, the repair steps are as follows:

1) Turning one side 2 to 5 mm before welding;

2) Wrap the heating belt tightly, turn on the power, and set the temperature to 200-220℃ every 4 hours, keep warm for 1 hour, until the temperature rises to 500℃ and keeps warm to the surfacing state;

3) The welding wire is welded on the roller surface by the surfacing process. The welding wire is heated to 250-300°C before welding. The flux HJ260 is used in combination. The welding voltage is 28-32V, the welding current is 320-340A, the bottom of the surfacing roller is heated, and the interlayer temperature is maintained at 250-300°C. After welding, asbestos is used for insulation for 4-5 hours and air-cooled to room temperature.

4) After welding, leave a 0.5mm margin for turning and perform color flaw detection;

5) Surface grinding to drawing size;

6) Check the shape, size and shape tolerance of the cladding parts and perform PT flaw detection;

7) Clean the processed parts with kerosene and wrap with plastic wrap.

Preferably, the surfacing process adopts surfacing equipment, which includes a movable guide rail, a heating mechanism and a surfacing mechanism. A traveling mechanism is installed on the movable guide rail, and the traveling mechanism is equipped with a traveling motor. A clamping mechanism is installed on the traveling mechanism, and the clamping mechanism is equipped with a rotating spindle. The rotating spindle is suitable for selectively driving the roller body to rotate, the heating mechanism is suitable for heating the roller body, and the surfacing mechanism is suitable for completing the surfacing work on the surface of the roller body after heating.

Preferably, the surfacing mechanism includes a mounting frame, on which a welding gun, a wire feeding structure, and an interlayer temperature maintaining structure are installed. The wire feeding structure includes a conveying area and a heating area. The heating area is located at the lower side of the conveying area. A conveying motor is symmetrically installed inside the conveying area. A driving wheel is installed at the output end of the conveying motor. The driving wheel is connected to the conveying wheel via a belt drive. The two groups of conveying wheels are suitable for conveying welding wire. A heating film tube, a power supply module, and a temperature sensing module are arranged in the heating area. The power supply module forms a closed loop with the heating film tube via a wire and a resistance module. The temperature sensing module is suitable for detecting the temperature of the heating film tube.

Preferably, the interlayer temperature maintaining structure includes a temperature maintaining frame arranged on both sides of the welding gun, and the temperature maintaining frames on both sides include a heating frame 1 and a heating frame 2 symmetrically distributed on both sides of the roller body, and the heating frame 1 and the heating frame 2 are suitable for being adjusted up and down relative to the temperature maintaining frame. A rotating motor is installed on the heating frame 1 and the heating frame 2, and a connecting head is installed on the output end of the rotating motor, and a heating body is installed on the connecting head. The heating body is an arc structure and the center of the arc structure is located on the axis of the roller body. A guide rail is provided on the side of the two heating bodies facing away from the roller body, and the guide rail and the connecting head are slidably installed. One end of the two heating bodies is connected via an electric heating wire, and the other end of the two heating bodies is provided with a magnet and a conductive terminal is provided on the magnet, and the guide rail is eccentrically arranged on the heating body and close to the magnet.

Preferably, the heating mechanism includes a plurality of hangers circumferentially arranged on a mounting frame and at least two driving motors, a winding structure is installed on the hanger, the two driving motors are suitable for driving the winding structure via a gear structure, a notch is provided on the winding structure for the clamping mechanism to pass through, a heating tape roll is installed on the winding structure, the free end of the heating tape wound on the heating tape roll is installed on a structure on one side of the mounting frame, and the other end is arranged on the heating tape roll and exposed to the outside, suitable for the free end to be connected to a power source via a wire to form a closed loop.

Preferably, the surfacing process is as follows:

The roller body is hoisted onto the clamping mechanism, and the walking mechanism moves along the movable guide rail to the heating station. The drive motor starts to drive the heating belt to be wrapped around the outside of the roller body through the winding structure. While the drive motor is working, the walking mechanism moves along the movable guide rail until the heating belt is wrapped around the outside of the roller body. After wrapping, the power supply is used to heat it to a temperature of 200-220°C every 4 hours, and the temperature is kept for 1 hour during the period until the temperature is raised to 500°C and kept to the surfacing state. A temperature detection module is installed on the mounting frame, which is suitable for detecting the temperature of the roller body. After heating, the drive motor drives the heating belt to reversely recycle the heating belt to the initial position, and the walking mechanism drives the clamping mechanism to clamp the fixed roller body. Move to the surfacing station, the rotating motor drives the heating frame 1 and the heating frame 2 to rotate 180°, the free ends are adsorbed by the magnet and the circuit of the conductive terminal is closed, a power supply module is installed on the heating body, the heating body is powered to control the temperature of the front side of the weld path to ensure that the interlayer temperature is maintained at 250℃~300℃, the rotating spindle and welding gun, conveying motor and power supply module of the clamping mechanism work at the same time, the power supply module drives the heating film tube to heat the welding wire through the resistance module, and the temperature sensing module detects the temperature of the welding wire, and the temperature is maintained at 250~300℃, the rotating spindle drives the roller to rotate, and the walking mechanism moves along the moving guide rail to complete the surfacing work on the roller surface.

Compared with the prior art, the present invention has the following beneficial effects:

1) Because high nickel-chromium infinitely chilled cast iron has a high carbon content and contains alloy elements such as nickel, chromium, and molybdenum, its weldability is relatively poor. It is very difficult to use ordinary surfacing technology. Therefore, when selecting surfacing materials, the specific volume ratio of the cast iron base material in the weld should be reduced as much as possible to reduce the entry of carbon, sulfur and other elements in the cast iron roll into the weld. Submerged arc welding causes the burning of Cr and Ni elements during welding. Therefore, when selecting Cr alloy elements, the loss of these elements can be supplemented during the welding process, thereby maintaining the composition and performance of the weld.

2) However, the inventors have found in long-term practice that the above theory can solve the above problems, but microcracks often occur during long-term practical verification, and the yield cannot be guaranteed. After analysis and verification from multiple angles by the inventor's team, it is believed that the large difference between the molten pool temperature and the substrate temperature may be the cause. In order to ensure that there is no cracking during the surfacing process, the inventors have tried many times to verify that ensuring the interlayer temperature at 250°C to 300°C can effectively avoid the occurrence of microcracks.

3) In order to make the weld free of cracks and pores, the inventor has a thermal strength similar to that of the parent material. The mass element of ferrite in the weld cannot be greater than 5%. For high-Cr austenite, in order to improve the crack resistance, the Mn element is added not more than 10%. At the same time, the Si element has the effect of improving the strength and toughness of the weld. In order to prevent decarburization cracking, Si is added to the weld to meet the requirements of weld performance and chemical composition. Stable phase alloy powder is also introduced. The stable phase alloy powder cannot be too high, which is easy to appear, and it cannot be too low. The introduction of Ti can play a role in refining the grains of the molded parts and inhibiting the generation of pores. It can also effectively improve the stability of the arc during the additive process. The addition of Gd can effectively reduce high-temperature rheological stress, refine grains, and improve mechanical properties. The addition of As can reduce the low melting eutectic at the grain boundary. The introduction of a small amount of Mo in the welding wire helps to improve the mechanical properties and the anisotropy of the molded parts. At the same time, Mo can effectively improve the hardness and wear resistance. It also assists in introducing La to hinder the combination of iron ions and electron holes and inhibit the diffusion rate of iron ions in the oxide layer, thereby improving the hardness and wear resistance of the molded parts. At the same time, it can also significantly reduce the impact of impurity elements.

4) At the same time, the flux used for cladding by this process should be neutral flux (HJ260), and a nano-composite coating is added to the surface of the welding wire. Butyl titanate as a metal adhesion promoter can effectively improve the adhesion of other powders on the surface of the welding wire, and form titanium dioxide after high-temperature decomposition. Titanium dioxide will cause the anode spots on the surface of the workpiece to shrink and the arc to shrink, and the surface tension gradient of the molten pool will change, which will play a role in refining the molten droplets and improving the arc stability, reducing spatter and improving the deposition efficiency; nano carbon black has good conductivity, fluidity and high-temperature lubricity, which is conducive to the dispersion uniformity of the coating liquid, ensuring the conductivity and wire feeding stability during the use of the welding wire, and forming carbon oxides during cladding, which further protects the alloy cladding layer and improves the cladding surface quality.

5) The surfacing process uses welding wire to heat up in advance, which can effectively eliminate the internal stress generated during welding and avoid problems such as cracks and deformation in the welded joints. This is very important for improving the reliability and durability of welded joints; it can also increase the strength and toughness of welded joints, improve the quality of welded joints, and ensure that they can withstand greater forces and pressures during use, thereby improving the safety and reliability of the entire equipment, and can improve the welding process, making the weld more uniform and smooth, and reducing defects such as pores and slag inclusions. The roller body is preheated before surfacing to reduce the temperature difference between the roller surface and the weld layer, promote better fusion, and effectively control the interlayer temperature to improve the interlayer bonding performance without anisotropy. Accurate temperature control can also ensure that the welding wire can fully exert its performance.

6) Use surfacing equipment to preheat the roller body. Compared with the previous manual wrapping, the wrapping preheating treatment by automated equipment improves safety and reliability. The welding wire is preheated in advance, and the welding wire is servo-conveyed and heated along the way through the conveying structure to ensure welding operability. The heating body is driven to rotate by a rotating motor, and the eccentric arrangement of the heating body automatically deflects during the rotation process. Finally, the circuit is closed by magnet adsorption to ensure that the interlayer temperature can be controlled within an appropriate range and the interlayer bonding strength is ensured. The two groups of heating bodies are located on both sides of the weld bead. Only one group of the two groups of heating bodies can be turned on, and the heating body that is consistent with the walking direction of the walking mechanism remains on. After the single-layer welding is completed, the clamping mechanism and the walking mechanism work in reverse and surfacing along the weld bead of the previous layer to ensure that the weld layer is not anisotropic.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the overall structure of a surfacing welding device according to the present invention;

FIG2 is a side view of a surfacing mechanism and a heating mechanism of a surfacing device of the present invention;

FIG3 is a schematic structural diagram of an interlayer temperature maintaining structure of a cladding device of the present invention under non-operating conditions;

FIG4 is a schematic structural diagram of an interlayer temperature maintaining structure of a cladding device of the present invention under working conditions;

5 is a top view of a heating frame 1 or a heating frame 2 of an interlayer temperature maintaining structure of a cladding equipment according to the present invention;

FIG. 6 is a schematic diagram of a partial structure of a wire feeding structure of a cladding device of the present invention.

In the figure: 10, moving guide rail; 20, walking mechanism; 30, clamping mechanism; 40, mounting frame; 41, conveying motor; 42, driving wheel; 43, conveying wheel; 44, heating film tube; 45, power supply module; 46, temperature sensing module; 47, resistance module; 48, temperature maintaining frame; 481, heating frame 1; 482, heating frame 2; 483, rotating motor; 484, connecting head; 4841, heating body; 485, slide rail; 486, magnet; 487, driving motor; 488, hanging part; 489, winding structure; 4810, heating tape roll.

DETAILED DESCRIPTION

The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

Example 1: A process for repairing the surface of an infinitely chilled cast iron substrate, the repair steps are as follows:

1) Turning one side 2 to 5 mm before welding;

2) Wrap the heating belt tightly, turn on the power, and set the temperature to 200-220℃ every 4 hours, keep warm for 1 hour, until the temperature rises to 500℃ and keeps warm to the surfacing state;

3) The welding wire is welded on the roller surface by the surfacing process. The welding wire is heated to 250-300°C before welding. The flux HJ260 is used in combination. The welding voltage is 28-32V, the welding current is 320-340A, the bottom of the surfacing roller is heated, and the interlayer temperature is maintained at 250-300°C. After welding, asbestos is used for insulation for 4-5 hours and air-cooled to room temperature.

4) After welding, leave a 0.5mm margin for turning and perform color flaw detection;

5) Surface grinding to drawing size;

6) Check the shape, size and shape tolerance of the cladding parts and perform PT flaw detection;

7) Clean the processed parts with kerosene and wrap with plastic wrap.

The components of the welding wire include, by mass fraction: C: 0.07, Cr: 18, Mn: 4, Ni: 2, Si: 0.4, Mo≤0.01, P≤0.03, S≤0.03, the balance is Fe and trace impurities, C=n*Si,n=(0.11~0.25), 0.03≤Mn/(Cr+Fe)≤0.07.

Embodiment 2, based on the above embodiment, makes the following improvements: the components of the welding wire include, by mass fraction: C: 0.08, Cr: 16, Mn: 6, Ni: 2, Si: 0.4, Mo≤0.01, P≤0.03, S≤0.03, the remainder is Fe and trace impurities, C＝n*Si,n＝(0.11～0.25), 0.03≤Mn/(Cr+Fe)≤0.07.

Embodiment 3, based on the above embodiment, the following improvements are made: the welding wire includes a nanocomposite coating coated and dried on the outside of the welding wire, the components of the nanocomposite coating include 3.5 parts of nano alloy powder, 0.8 parts of n-butyl titanate and 6.7 parts of basic solvent by mass fraction, the components of the nano alloy powder include by mass fraction: Ti: 80-90, Gd: 5-15, La: 5-15, Y2O3: 0-5, nano carbon black: 2-5; preferably Ti: 84, Gd: 5, La: 5, Y2O3: 3, nano carbon black: 3, the basic solvent is one or more of alcohol solvents, alcohol ether solvents, ester solvents and ketone solvents. Prepare the nanocomposite stock solution and apply it on the surface of the welding wire, and obtain the composite welding wire after drying. The welding wire can be micro-etched before applying the nanocomposite stock solution, and the corrosion also uses dilute sulfuric acid and citric acid to erode for 10-20s, and the surface of the welding wire is roughened to facilitate the application of the nanocomposite coating.

The hardness of the roller body surfacing layer treated by the above scheme is HS40-45, without anisotropy, and the repaired layer is found to have no cracks or sand holes after experimental flaw detection.

Embodiment 4, based on the above embodiment, the following improvements are made: as shown in Figure 1, the surfacing process adopts surfacing equipment, the surfacing equipment includes a movable guide rail 10, a heating mechanism and a surfacing mechanism, a traveling mechanism 20 is installed on the movable guide rail 10, the traveling mechanism 20 is equipped with a traveling motor, a clamping mechanism 30 is installed on the traveling mechanism 20, the clamping mechanism 30 is equipped with a rotating spindle, the rotating spindle is suitable for selectively driving the roller body to rotate, the heating mechanism is suitable for heating the roller body, and the surfacing mechanism is suitable for completing the surfacing work on the roller body surface after heating.

As shown in Figures 1 and 2, the surfacing mechanism includes a mounting frame 40, on which a welding gun, a wire feeding structure, and an interlayer temperature maintaining structure are installed. As shown in Figure 6, the wire feeding structure includes a conveying area and a heating area. The heating area is located at the lower side of the conveying area. A conveying motor 41 is symmetrically installed inside the conveying area, preferably a servo motor. The wire feeding speed of the servo motor meets the rotation speed of the rotating spindle of the clamping mechanism 30. A driving wheel 42 is installed at the output end of the conveying motor 41. The driving wheel 42 is connected to a conveying wheel 43 through a belt drive. The two sets of conveying wheels 43 are suitable for conveying welding wire. As shown in Figure 2, the top rectangular area is a wire storage box. A heating film tube 44, a power supply module 45, and a temperature sensing module 46 are arranged in the heating area. The power supply module 45 forms a closed loop with the heating film tube 44 through a wire and a resistance module 47. The temperature sensing module 46 is suitable for detecting the temperature of the heating film tube 44. During the wire feeding process, the heating film tube 44 is heated synchronously to ensure the preheating temperature of the welding wire.

As shown in FIG1 , the interlayer temperature maintaining structure includes a temperature maintaining frame 48 arranged on both sides of the welding gun. As shown in FIG2 , the temperature maintaining frames 48 on both sides include a heating frame 1 481 and a heating frame 2 482 symmetrically distributed on both sides of the roller body. The heating frame 1 481 and the heating frame 2 482 are suitable for being adjustable in the upper and lower positions relative to the temperature maintaining frame 48. Specifically, a cylinder can be used to drive them to move up and down along the temperature maintaining frame 48. As shown in FIG3 and FIG4 , a rotating motor 483 is installed on the heating frame 1 481 and the heating frame 2 482. The output end of the rotating motor 483 is installed A connector 484 is provided, on which a heater 4841 is installed. The heater 4841 is an arc-shaped structure and the center of the arc-shaped structure is located on the axis of the roller body. A slide rail 485 is provided on the side of the two heaters 4841 facing away from the roller body. The slide rail 485 and the connector 484 are slidably installed. One end of the two heaters 4841 is connected via an electric heating wire. The other ends of the two heaters 4841 are both provided with a magnet 486 and the magnet 486 is provided with a conductive terminal. The slide rail 485 is eccentrically arranged on the heater 4841 and close to the side of the magnet 486. As shown in FIG3 , under non-working conditions, the magnet 486 remains in an upward position, and when the rotating motor 483 drives the heater 4841 to rotate, the magnet 486 rotates downward. Before rotating to a horizontal position, the heating frame 1 481 and the heating frame 2 482 move downward under the action of the cylinder, and the heater 4841 is located on both sides of the roller body. After passing the horizontal position, the magnet 486 moves downward, the connector 484 moves along the slide rail 485, and the heater 4841 deflects downward until the magnets 486 adsorb each other to complete the outer cover of the roller body. A power supply module is installed on the heater 4841. The heater 4841 is powered to control the temperature of the front side of the weld path to ensure that the interlayer temperature is maintained at 250°C to 300°C, as shown in FIG4 .

As shown in Figure 2, the heating mechanism includes a plurality of hangers 488 circumferentially arranged on the mounting frame 40 and at least two driving motors 487, a winding structure 489 is installed on the hanger 488, and the two driving motors 487 are suitable for driving the winding structure 489 through a gear structure, a notch is provided on the winding structure 489 for the clamping mechanism 30 to pass through, a heating tape roll 4810 is installed on the winding structure 489, and the free end of the heating tape wound on the heating tape roll 4810 is installed on a structure on one side of the mounting frame 40, and the other end is arranged on the heating tape roll 4810 and exposed to the outside, suitable for the free end to be connected to a power source via a wire to form a closed loop. The winding structure 489 is a gear ring structure, which is driven to rotate by two sets of drive motors 487. The heating tape roll 4810 is a winder with an automatic recovery function (with a coil spring inside). It is a mature product on the market and can be purchased directly. The walking mechanism 20 drives the roller body to move axially, and at the same time, the winding structure 4810 drives it to perform winding processing to ensure the heating effect of the winding wrapping. After the heating is completed, the drive motor 487 and the walking mechanism 20 move in the opposite direction, and the heating tape roll 4810 automatically recycles the heating tape.

As shown in Figures 1 to 6, the surfacing process is specifically as follows:

The roller body is hoisted onto the clamping mechanism 30, and the walking mechanism 20 moves along the movable guide rail 10 to the heating station. The driving motor 487 works, and the heating belt roll 4810 is driven to wrap around the outside of the roller body through the winding structure 489. While the driving motor 487 is working, the walking mechanism 20 moves along the movable guide rail 10 until the heating belt is wrapped around the outside of the roller body. After the wrapping is completed, the power supply is used to heat it to a temperature of 200-220°C every 4 hours, and the temperature is kept for 1 hour during the period until the temperature is increased to 500°C and kept to the surfacing state. A temperature detection module is installed on the mounting frame 40, which is suitable for detecting the temperature of the roller body. After the heating is completed, the driving motor 487 drives the heating belt roll 4810 to reversely recycle the heating belt to the initial position. The walking mechanism 20 drives the clamping mechanism 30 to clamp the fixed roller body and move it to the surfacing station, and the rotating motor 483 drives the heating frame 1 481 and the heating frame 2 482 to rotate 180°, first deflecting to the side away from the welding gun and then deflecting to the side close to the welding gun. The free end is adsorbed by the magnet 486 and the circuit of the conductive terminal is closed. A power supply module is installed on the heating body 4841. The heating body 4841 is powered to control the temperature of the front side of the welding path to ensure that the interlayer temperature is maintained at 250℃~300℃. The rotating spindle and welding gun, conveying motor 41 and power supply module 45 of the clamping mechanism 30 work at the same time. The power supply module drives the heating film tube 44 to heat the welding wire through the resistance module 47. At the same time, the temperature sensing module 46 detects the temperature of the welding wire. The temperature is maintained at 250~300℃. The rotating spindle drives the roller body to rotate, and the walking mechanism 20 moves along the movable guide rail 10 to complete the surfacing work on the roller body surface.

The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. The replacement may be a replacement of a part of the structure, device, method step, or a complete technical solution. Any equivalent replacement or change according to the technical solution and the inventive concept of the present invention shall be covered within the protection scope of the present invention.

Claims (5)

1. A surfacing welding device for repairing the surface of an infinitely cold hardened cast iron substrate, characterized in that the surfacing welding device comprises a movable guide rail (10), a heating mechanism and a surfacing welding mechanism, a traveling mechanism (20) is installed on the movable guide rail (10), the traveling mechanism (20) is equipped with a traveling motor, a clamping mechanism (30) is installed on the traveling mechanism (20), the clamping mechanism (30) is equipped with a rotating spindle, the rotating spindle is suitable for selectively driving a roller body to rotate, the heating mechanism is suitable for heating the roller body, and the surfacing welding mechanism is suitable for completing the surfacing work on the surface of the heated roller body. 2. According to claim 1, a surfacing welding device for surface repair of an infinitely cold-hardened cast iron substrate is characterized in that the surfacing welding mechanism includes a mounting frame (40), on which a welding gun, a wire feeding structure, and an interlayer temperature maintaining structure are installed. The wire feeding structure includes a conveying area and a heating area. The heating area is located at the lower side of the conveying area. A conveying motor (41) is symmetrically installed inside the conveying area. A driving wheel (42) is installed at the output end of the conveying motor (41). The driving wheel (42) is connected to a conveying wheel (43) via a belt drive. The two groups of conveying wheels (43) are suitable for conveying welding wire. A heating film tube (44), a power supply module (45), and a temperature sensing module (46) are arranged in the heating area. The power supply module (45) forms a closed loop with the heating film tube (44) via a wire and a resistance module (47). The temperature sensing module (46) is suitable for detecting the temperature of the heating film tube (44). 3. A surfacing welding device for repairing the surface of an infinitely cold cast iron substrate according to claim 2, characterized in that the interlayer temperature maintaining structure includes a temperature maintaining frame (48) arranged on both sides of the welding gun, and the temperature maintaining frames (48) on both sides include a heating frame 1 (481) and a heating frame 2 (482) symmetrically distributed on both sides of the roller body, and the heating frame 1 (481) and the heating frame 2 (482) are suitable for being adjusted in upper and lower positions relative to the temperature maintaining frame (48), and the heating frame 1 (481) and the heating frame 2 (482) are both installed with a rotating motor (483), and the output end of the rotating motor (483) is installed with a connector (4 84), a heating body (4841) is installed on the connecting head (484), the heating body (4841) is an arc structure and the center of the arc structure is located on the axis of the roller body, a slide rail (485) is arranged on the side of the two heating bodies (4841) facing away from the roller body, the slide rail (485) and the connecting head (484) are slidably installed, one end of the two heating bodies (4841) is connected via an electric heating wire, the other end of the two heating bodies (4841) is provided with a magnet (486) and the magnet (486) is provided with a conductive terminal, and the slide rail (485) is eccentrically arranged on the heating body (4841) and close to the side of the magnet (486). 4. A surface repair process for an infinitely cold-hardened cast iron substrate according to claim 3, characterized in that the heating mechanism includes a plurality of hangers (488) circumferentially arranged on a mounting frame (40) and at least two drive motors (487), a winding structure (489) is installed on the hanger (488), the two drive motors (487) are suitable for driving the winding structure (489) through a gear structure, a notch is provided on the winding structure (489) for the clamping mechanism (30) to pass through, a heating tape roll (4810) is installed on the winding structure (489), a free end of the heating tape wound on the heating tape roll (4810) is installed on a structure on one side of the mounting frame (40), and the other end is arranged on the heating tape roll (4810) and exposed to the outside, suitable for the free end to be connected to a power source via a wire to form a closed loop. 5. A surfacing welding process for the surfacing welding equipment for infinitely chilled cast iron substrate surface repair according to claim 4, characterized in that the surfacing welding process is specifically as follows: The roller body is hoisted onto the clamping mechanism (30), and the walking mechanism (20) moves along the movable guide rail (10) to the heating station. The driving motor (487) works, and the heating belt roll (4810) is driven by the winding structure (489) to wrap around the outer side of the roller body. While the driving motor (487) works, the walking mechanism (20) moves along the movable guide rail (10) until the heating belt is wrapped around the outer side of the roller body. After wrapping, the power supply is used to heat it to a temperature of 200-220° C. every 4 hours, and the temperature is kept for 1 hour during the period until the temperature is raised to 500° C. and kept to a surfacing state. A temperature detection module is installed on the mounting frame (40) for detecting the temperature of the roller body. After heating, the driving motor (487) drives the heating belt roll (4810) to reversely retract the heating belt to the initial position, and the walking mechanism (20) drives the clamping mechanism (30) to clamp the fixed roller. The roller body is moved to the surfacing position, the rotating motor (483) drives the heating frame 1 (481) and the heating frame 2 (482) to rotate 180 degrees, the free end is adsorbed by the magnet (486) and the circuit of the conductive terminal is closed, the heating body (4841) is equipped with a power supply module, the heating body (4841) is powered to control the temperature of the front side of the welding path to ensure that the interlayer temperature is maintained at 250°C to 300°C, the rotating spindle and welding gun of the clamping mechanism (30), the conveying motor (41) and the power supply module (45) work simultaneously, the power supply module drives the heating film tube (44) to heat the welding wire through the resistance module (47), and the temperature sensing module (46) detects the temperature of the welding wire, and the temperature is maintained at 250°C to 300°C, the rotating spindle drives the roller body to rotate, and the walking mechanism (20) moves along the moving guide rail (10) to complete the surfacing work on the roller body surface.