A method for processing the surface of a roll based on a layered composite process

Abstract

The application belongs to the field of winding drum surface treatment, and particularly relates to a winding drum surface treatment method based on a layered composite process. The upper and lower winding drums are subjected to targeted surface treatment, the lower winding drum is subjected to thermal spraying to obtain a surface composite layer, and the surface composite layer is used to ensure the hardness and toughness, wear resistance and corrosion resistance of the lower winding drum; the upper winding drum is subjected to a surfacing process to obtain a surfacing layer, and the surfacing layer is used to reduce surface scratches on the steel wire.

Description

Technical Field

[0001] This invention belongs to the field of roll surface treatment, specifically a roll surface treatment method based on a layered composite process. Background Technology

[0002] Currently, the surface treatment of the D900 large wire drawing machine drum mainly adopts two processes:

[0003] The first type, such as 201310164130.4, uses 45# steel overlay welding process: the surface hardness is low (about HRC 25-30). In high-speed threading and large-specification high carbon steel wire (such as Φ6.0mm and above) operations, the drum is easily worn by the chain and wire head, resulting in problems such as pits and scratches, and the service life is less than 6 months.

[0004] The second type, such as CN201811547608.0, uses a full-coating WC process: it has high surface hardness (HRC 60-65), but is brittle. When the upper wire groove rubs against the steel wire, it is easy to cause scratches on the surface of the steel wire (damage rate >15%), which affects the quality of the finished product. Summary of the Invention

[0005] The technical problem to be solved by this invention is: how to make targeted improvements to the drum at different positions to solve the problem of scratches on the surface of the steel wire.

[0006] To solve the above-mentioned technical problems, the inventors, through practice and summarization, derived the technical solution of this invention, which adopts the following technical solution:

[0007] A method for surface treatment of a roll based on a layered composite process, wherein the roll comprises an upper roll and a lower roll;

[0008] Step 1, Surface cleaning

[0009] Clean the surface of the roll to reveal its metallic luster; use a cleaning agent to remove surface oil and dry.

[0010] Step 2, coarsening

[0011] The surface of the roll is roughened to Sa3 cleanliness level;

[0012] Step 3, Differentiated surface treatment of the roll

[0013] For the lower reel:

[0014] The lower drum is preheated to 150-200℃, and a surface composite layer is obtained by high-speed oxygen fuel spraying. The spraying distance is 120-200mm, the powder feeding rate is 30-50g / min, and the hardness of the final surface composite layer is controlled to HRC 60-65.

[0015] The surface composite layer comprises, by weight, Ni: 16-20, Cr: 4-6, Co: 8-15, WC: 22-35, with the balance being Fe and impurities. The particle size of the surface composite material is 15-45 μm, wherein 0.11≤Co / (Ni+Fe)≤0.38, 0.38≤(WC+Co) / (Ni+Fe)≤1.25.

[0016] For the upper winding drum:

[0017] Heat the upper drum to 350-450℃ and hold for 1-2 hours. Preheat the welding wire to 200-300℃ and deposit the welding wire onto the surface of the upper drum. After welding, temper at 580-620℃ for 1.5-2.5 hours and control the hardness to HRC 35-40.

[0018] The welding wire comprises, by weight, C: 0.38–0.45, Si: 0.17–0.37, Mn: 0.50–0.80, Cr: 0.90–1.20, Mo: 0.15–0.25, V: 0.12–0.18, Nb: 0.12–0.18, Ni: 0.45–0.65, Ti: 0.10–0.15, P: ≤0.035, S: ≤0.035, with the balance being Fe and impurities. The welding wire diameter is Φ1.2 mm.

[0019] Among them, 1.31≤(Cr+V+Nb+Ni+Mo) / (Mn+S i+T i)≤3.20, 0.58≤(Cr+Mo) / (V+Nb+Ni+Mn)≤1.22, 1.37≤Cr / N i≤2.67.

[0020] In a preferred embodiment, after roughening treatment, the roll forms a uniform network structure on its surface, the network structure consisting of forward spiral patterns and reverse spiral patterns.

[0021] In a preferred embodiment, when applying a high-speed oxygen fuel spray coating to the surface of the lower drum, a clamping mechanism is installed at one end of the lower drum, a lifting platform is provided below the clamping mechanism, a rotary table and a horizontal rotating mechanism for driving the rotary table are installed on the lifting platform, a rotating spindle for installing the clamping mechanism and a servo drive assembly for driving the rotating spindle are installed on the rotary table, a lifter is installed at the bottom of the lifting platform, the bottom of the lifter is installed on a traveling vehicle, and an independent traveling mechanism is installed on the traveling vehicle.

[0022] A heating box and an insulation box are independently provided at both ends of the lower drum. The heating box is used to heat the lower drum. One end of the insulation box is equipped with a side opening. The lower drum enters the insulation box through the side opening. A ejector mechanism is installed inside the insulation box. The ejector mechanism includes a traveling seat that moves axially along the side opening. A lifting seat and a lifter that drives the lifting seat to move up and down are installed on the traveling seat. An ejector is installed on the lifting seat. The ejector is used to push against one end of the lower drum.

[0023] The thermal spraying assembly is installed inside the insulation box. The thermal spraying assembly includes a spray nozzle for spraying the surface of the lower roll. The spray nozzle runs relative to the insulation box in a direction parallel to the axis of the lower roll. An annular air pipe is installed on the outside of the spray nozzle. Several air outlets are evenly distributed around the bottom of the annular air pipe. The air outlets are offset from the axis of the spray nozzle in the direction close to the lower roll. The airflow forms an airflow isolation hood on the outside of the spray nozzle through the air outlets, with the coverage area gradually increasing in the direction close to the lower roll. This is used to prolong the floating time of the splashed alloy particles during spraying.

[0024] In a preferred embodiment, an airflow channel is provided between the annular air pipe and the spray nozzle, and a capturing metal mesh is installed in the airflow channel to capture splashed alloy particles.

[0025] In a preferred embodiment, a ball-head structure is installed on the outer side of the spray nozzle. The ball-head structure is connected to a mounting plate. A spherical groove is installed on the mounting plate, and the ball-head structure is installed in the spherical groove. A limiting plate is installed on the mounting plate, which is fitted onto the outer side of the ball-head structure and installs the ball-head structure in the spherical groove. An axial guide plate is slidably fitted on the outer side of the mounting plate. The axial guide plate is fixedly installed on the inner wall of the insulation box. A locking sleeve is fitted on the outer side of the spray nozzle. An electromagnet is embedded in the top of the side of the locking sleeve, and a terminal for electrical connection to the electromagnet is provided on the surface. An elastic body is fitted on the outer side of the spray nozzle located at the top of the electromagnet. A fixing plate is connected to the top of the elastic body, and the fixing plate is fixedly installed on the spray nozzle.

[0026] The insulation box is equipped with a servo motor 1, a servo motor 2, an independent power supply, and a drive wheel. The end of the servo motor 1 is equipped with a take-up reel 1, and a connecting steel rope 1 is wound on the take-up reel 1. One end of the connecting steel rope 1 passes over the drive wheel 1 and is connected to the fixed plate. The end of the servo motor 2 is equipped with a take-up reel 2, and a connecting steel rope 2 is wound on the take-up reel 2. One end of the connecting steel rope 2 is connected to the mounting plate.

[0027] A positioning plate is installed on the inner wall of the insulated box. An energized electrode is installed on the positioning plate. The energized electrode is connected to an independent power supply via a wire. The energized electrode is used to contact the terminal to electrically connect the electromagnet and the independent power supply to form a closed circuit.

[0028] In a preferred embodiment, the lower roll coating step is as follows:

[0029] S311, preheating

[0030] The lower drum is mounted on the traveling trolley via a clamping mechanism. The independent traveling mechanism on the traveling trolley moves the lower drum into the heating box and preheats it to 150-200℃.

[0031] S312, thermal insulation

[0032] After the lower drum is preheated to 150-200℃, the traveling trolley removes the lower drum from the heating box and immediately rotates it 180° horizontally via a horizontal rotation mechanism, turning the lower drum toward the insulation box. The lower drum is then axially positioned by the pin mechanism on the traveling seat inside the insulation box. The traveling trolley and the traveling seat move simultaneously to move the lower drum into the insulation box. The end of the lower drum is then attached to the positioning plate. Rolling elements are installed on the side wall of the positioning plate to attach to the end face of the lower drum. The lifting device and the hoist work simultaneously to move the lower drum upward to a predetermined height. This predetermined height is when the center of the ball head structure and the center of the arc-shaped area at the edge of the lower drum are on the same horizontal line.

[0033] S313, spraying

[0034] The servo drive assembly drives the rotating spindle to rotate at a constant speed. While rotating at a constant speed, the spray nozzle works to spray the surface of the lower drum. At the same time, servo motor one and servo motor two start and drive take-up reels one and two to rotate. Take-up reels one and two rotate in opposite directions. Through the connecting steel cable one, the spray nozzle moves at a constant speed along the axis of the rotating spindle. When the spray nozzle moves to the edge of the arc-shaped area at the edge of the lower drum, the terminal and the energized electrode contact the electromagnet circuit. The electromagnet is energized and attracts the fixed plate at the top and compresses the elastic body. The axial restriction of the ball head structure is released. After the axial restriction is released, the spray nozzle rotates around the ball head structure under the traction of the connecting steel cable to perform spraying operations on the arc-shaped area. While the spray nozzle is rotating, servo motor two will not continue to drive the mounting plate to continue moving along the axis of the lower drum.

[0035] S314, demolition

[0036] Servo motor one first rotates in the opposite direction, and the spray nozzle returns to a vertical position under the action of gravity. At this time, the spray nozzle returns to the top of the arc-shaped area boundary. Then, servo motor two starts and runs in the opposite direction together with servo motor one. At the same time, the terminal and the energized electrode separate, and the locking sleeve restricts the angle of the spray nozzle axially again under the action of the elastic body. As servo motor two and servo motor one run synchronously, the mounting plate is reset to the initial state. The lifting device and the hoisting device are opened at the same time to lower the lower drum to the initial height. The traveling carriage and the traveling seat move synchronously to the outside of the insulation box. The traveling component continues to move, causing one end of the lower drum to disengage from the ejector pin. After disengagement, the clamping mechanism is released to remove the lower drum from it.

[0037] In a preferred embodiment, when welding the upper drum, a clamping fixture is installed at one end of the upper drum and an axial telescopic ejector pin is installed at the other end. The clamping fixture is installed at one end of the rotary spindle. The axial telescopic ejector pin and the rotary spindle are both installed on a movable seat. The movable seat is equipped with a servo driver that drives the rotary spindle to rotate and an electric drive walking assembly that drives the movable seat to move along the axial direction of the upper drum. A second heating box is independently provided on the outer side of the upper drum. The two ends and the bottom of the second heating box are designed with an open structure.

[0038] The interior of heating box two is equipped with an upper heat insulation plate and a lower heat insulation plate, as well as a heater for heating the upper drum. A gap is reserved between the upper heat insulation plate and the lower heat insulation plate, which are located on the top inner side of heating box two.

[0039] Both the upper and lower heat insulation boards have slots parallel to the axis of the upper drum, and welding guns are independently installed in the slots of the upper and lower heat insulation boards.

[0040] A toothed plate and a limiting strip are installed on one side of the top of the slot of the upper heat insulation plate and the lower heat insulation plate, and a vertical plate is installed between the upper heat insulation plate and the lower heat insulation plate. A guide groove is installed on the vertical plate, and a sliding pin is installed on the side of the welding gun. The sliding pin is slidably engaged in the guide groove.

[0041] Two connecting sleeves are installed on the outside of the welding torch. Each connecting sleeve has a rotating shaft connected to one side via a bearing. A gear is mounted on the rotating shaft and meshes with a rack plate. The end of the rotating shaft away from the connecting sleeve is connected to a moving block via a bearing. The moving block and the limit strip slide together. Each moving block is equipped with a rotary motor, and one end of the rotary motor is connected to the rotating shaft.

[0042] The guide groove includes a horizontal section, an arc section one, an arc section two, and an arc section three. Arc sections one and three are symmetrically distributed on both sides of arc section two. The centers of arc sections one and three are located on the boundaries of the two sides of the guide groove, respectively. The center of arc section two is located directly behind the center of the arc surface of the guide groove.

[0043] The upper roll welding process is as follows:

[0044] S321, preheating

[0045] One end of the upper drum is mounted on the clamping fixture, and the other end is connected by an axial telescopic pin. The upper drum is moved into the heating box 2 by the electric drive walking component on the moving seat. The heater inside heats the upper drum to 350-450℃. The rotary spindle rotates at timed intervals under the action of the servo drive and is kept at the temperature for 1-2 hours.

[0046] S321, wire feeding

[0047] The wire feeding mechanism feeds the welding wire into the end of the welding gun. During the wire feeding process, the welding wire is heated to 200-300℃ through the heating film tube at the wire outlet.

[0048] S322, weld overlay

[0049] The rotary spindle rotates at a constant speed under the action of the servo drive, and the welding gun welds the welding wire onto the upper drum. At the same time, the two rotary motors run synchronously and at the same speed along the direction parallel to the axis of the upper drum.

[0050] When the welding torch reaches the boundary of the lead wire groove, the rotating motors corresponding to the upper and lower connecting sleeves continue to run, and the running speed of the upper rotating motor is greater than that of the lower rotating motor. The sliding pin will enter the arc section from the horizontal section. The welding torch completes the angle adjustment at this point within one rotation of the upper drum. At this time, the rotation center of the upper connecting sleeve is located at the center of the arc surface of the lead wire groove.

[0051] Subsequently, the rotary motor corresponding to the upper connecting sleeve stops running, and the rotary motor corresponding to the lower connecting sleeve runs independently. The sliding pin enters the second arc segment, and the welding torch performs arc surface welding around the lead wire groove.

[0052] When it reaches the other boundary of the lead wire groove, the rotary motor corresponding to the upper connecting sleeve starts running again, and the running speed of the upper rotary motor is greater than that of the lower rotary motor. The welding torch completes the angle adjustment within one rotation of the upper drum at this point, and the sliding pin enters the next horizontal section through the arc segment three.

[0053] S323, dismantling

[0054] After the upper drum is welded, the moving seat moves the upper drum out of the heating box via the electric drive walking assembly, removes it and transfers it to the tempering furnace, where it is tempered at 580-620℃ for 1.5-2.5 hours, and the hardness is controlled to HRC 35-40.

[0055] Compared with the prior art, the present invention has the following beneficial effects:

[0056] 1. This invention performs targeted surface treatment on the upper and lower drums. The lower drum is thermally sprayed to obtain a surface composite layer, which is used to ensure the hardness, toughness, wear resistance, and corrosion resistance of the lower drum. The upper drum is welded to obtain a weld overlay layer, which is used to reduce surface scratches on the steel wire.

[0057] 2. This invention uses a thermally sprayed surface composite material for the lower roll. The thickness of the surface composite layer is 0.8-1.2mm. The surface composite material uses a specific formula. To ensure surface hardness, WC is used as the core source of the hard phase. When the content is around 30%, the risk of brittleness needs to be controlled. Ni, Co, and Fe are used to compensate for matrix toughening. By rationally controlling the ratio of Co to Ni and Fe, it is maintained between 0.11 and 0.38. When it is less than 0.11, the toughness of the surface working layer is insufficient; when it is greater than 0.38, there is a risk of insufficient hardness. Since WC and Co will form a hard alloy phase, the ratio of the total amount of WC and Co to the total amount of Ni and Fe is also precisely controlled between 0.38 and 1.25 to maintain a balance between the hard phase and the binder phase, thereby obtaining the best coating performance. Through the strict control of the above components, the surface hardness can be maintained at HRC 60-65, while also maintaining a certain degree of toughness, reducing the cracking problem of the soil layer, and possessing thermal shock resistance. Cr is also introduced into the surface composite material. Cr can improve the antioxidant and corrosion resistance properties, and can also further regulate the hardness of the working surface.

[0058] 3. This invention employs a welding process on the upper coil, with a weld overlay thickness of 3-4 mm. A new welding wire formula is used to ensure the hardness and toughness of the weld overlay, reducing scratches on the steel wire. During the welding of the upper coil, the components are rationally formulated by introducing Cr, V, Nb, Ni, Mn, Si, and Ti. When introducing these elements, their effects on the hardness, toughness, and wear resistance of the weld overlay, as well as the interactions between the elements, are fully considered. This improves the uniformity and density of the material, reduces the damage rate of the steel wire, and also improves the toughness of the weld overlay, reducing steel wire damage caused by brittle fracture. By rationally controlling (Cr+V+Nb+Ni+Mo) / (Mn+Si+Ti) and maintaining it between 1.31 and 3.20, the problem of slag inclusions during welding can be solved. If it is below 1.31, the hardness, wear resistance, corrosion resistance, and toughness of the weld layer cannot be precisely controlled; if it is above 3.20, it will lead to excessive slag inclusions and porosity. The combined effect of Mn, Si, and Ti is used to reduce the probability of slag formation, melting point, and density, thereby improving slag self-expulsion. This is achieved through the rational distribution of Cr, V, Nb, and N... The ratio of chromium and nickel is precisely controlled to manage the hardness, wear resistance, corrosion resistance, and toughness of the weld overlay. By rationally controlling the ratio of (Cr+Mo) / (V+Nb+Ni+Mn) and maintaining it between 0.58 and 1.22, hardness and toughness can be precisely controlled, preventing damage to the steel wire. If the ratio is below 0.58, the toughness is too high, leading to premature damage to the weld overlay; if it is above 1.22, the hardness is too high, and the damage rate to the steel wire cannot be maintained below 3%. The chromium-nickel ratio is also precisely controlled to avoid excessively high or low ferrite content in the weld metal, thus preventing hot cracking.

[0059] 4. The present invention can form a network structure on the surface of the roll by sandblasting roughening treatment. The forward spiral pattern and the reverse spiral pattern can improve the interfacial bonding ability, thereby ensuring that the interlayer bonding strength between the thermal spray coating and the substrate is ≥70MPa.

[0060] 5. In this invention, during the thermal spraying of the lower roll, a separate heating box is required on the outside for preheating to 150-200℃ to reduce the interface temperature difference and prevent the formation of a brittle layer at the interface. After heating, the lower roll is rotated 180° by a horizontal rotating mechanism to change its orientation and move into the heat preservation box. The axial position of the lower roll is limited by a pin mechanism. During the thermal spraying of the lower roll, a structure that forms an airflow isolation hood is set on the outside of the spray nozzle. The air pressure difference between the inside and outside of the airflow isolation hood increases the floating time of the splashed alloy particles. Finally, the splashed alloy particles are captured by a capturing metal mesh, thereby preventing the formation of alloy slag on the unsprayed surface during spraying, which would affect the surface quality of the surface composite layer. Secondly, an independently designed spray nozzle with an adjustable angle is used to spray the arc-shaped part of the lower roll surface near the edge. This ensures that the spraying angle of the arc-shaped area is always perpendicular to the surface of the arc-shaped part, thereby ensuring the uniformity of the surface composite layer thickness.

[0061] 6. This invention features a targeted spraying structure design for thermal spraying. Spraying is performed within an insulated box. During spraying, servo motors one and two move synchronously to move the nozzle to the boundary of the arc-shaped area. After the electromagnet is energized, the locking sleeve moves upward, releasing the nozzle's angle restriction. With the continued operation of servo motor one, the nozzle's angle is adjusted, ensuring the center of the ball head structure coincides with the center of the arc-shaped area, thus guaranteeing both the spraying angle and spraying quality. After spraying is completed, servo motor one rotates in the opposite direction, and the nozzle returns to a vertical position under gravity. When the terminal and electrode are disconnected, the nozzle's angle is re-restricted by the elastic body. From then on, the nozzle can only move axially along the lower drum.

[0062] 7. The present invention also makes targeted improvements to the welding structure by installing two connecting sleeves on the welding gun and using the spring connecting the two connecting sleeves in conjunction with two rotary motors to achieve three angle spraying of the welding gun, thereby realizing targeted welding operations on the lead groove of the upper drum. Attached Figure Description

[0063] Figure 1 This is a diagram illustrating the working condition of the reel in this invention.

[0064] Figure 2 This is a diagram illustrating the working conditions during the lower roll spraying process of the present invention.

[0065] Figure 3 for Figure 2 Diagram showing the positional relationship between the central guide plate and its structure.

[0066] Figure 4 for Figure 3 A top view of the central annular trachea.

[0067] Figure 5 for Figure 3 A magnified view of a portion of point A in the middle.

[0068] Figure 6 for Figure 3 A schematic diagram of the overall structure of the center positioning plate.

[0069] Figure 7 This is a top view of the axial guide plate and its structure.

[0070] Figure 8 This is a schematic diagram of the overall structure of the locking sleeve.

[0071] Figure 9 This is a diagram illustrating the working conditions during the welding of the upper drum of the present invention.

[0072] Figure 10 This is a cross-sectional view of the upper roll during the welding process of the present invention.

[0073] In the picture:

[0074] 100. Upper drum; 101. Clamping fixture; 102. Axial telescopic ejector pin; 103. Rotary spindle; 104. Moving seat; 105. Servo driver; 106. Electric drive walking assembly; 107. Heating box two; 108. Upper heat insulation plate; 109. Rack plate; 110. Limiting strip; 111. Welding torch; 112. Connecting sleeve; 113. Rotary shaft; 114. Gear; 115. Rotary motor; 116. Moving block; 117. Moving body; 118. Lower heat insulation plate; 119. Heater; 120. Bellows-style heat insulation sheet; 121. Vertical plate; 122. Guide groove; 1221. Horizontal section; 1222. Arc section one; 1223. Arc section two; 1224. Arc section three; 123. Sphere.

[0075] 200. Lower drum; 201. Clamping mechanism; 202. Lifting platform; 203. Rotary table; 204. Horizontal rotation mechanism; 205. Rotary spindle; 206. Servo drive assembly; 207. Lifter; 208. Traveling carriage; 209. Independent traveling mechanism; 211. Heating box one; 212. Insulation box one; 213. Traveling seat; 214. Lifter; 215. Lifting seat; 216. Ejector pin; 218. Spray nozzle; 219. Annular air pipe; 220. Metal capture device 221. Net; 222. Ball head structure; 223. Mounting plate; 224. Limiting plate; 225. Axial guide plate; 226. Locking sleeve; 227. Electromagnet; 228. Elastomer; 229. Terminal; 230. Fixing plate; 231. Servo motor one; 232. Servo motor two; 233. Transmission wheel; 234. Independent power supply; 235. Winding reel one; 236. Connecting steel rope one; 237. Winding reel two; 238. Positioning plate; 239. Energized electrode. Detailed Implementation

[0076] Example 1

[0077] A method for surface treatment of a roll based on a layered composite process, characterized in that the roll comprises an upper roll 100 and a lower roll 200;

[0078] Step 1, Surface cleaning

[0079] Clean the surface of the roll to reveal its metallic luster; use a cleaning agent to remove surface oil and dry.

[0080] Step 2, coarsening

[0081] The surface of the roll is roughened to Sa3 cleanliness level;

[0082] Step 3, Differentiated surface treatment of the roll

[0083] For the lower drum 200:

[0084] The lower drum 200 is preheated to 150-200℃, and a surface composite layer is obtained by high-speed oxygen fuel spraying. The spraying distance is 120-200mm, the powder feeding rate is 30-50g / min, and the hardness of the final surface composite layer is controlled to HRC 60-65.

[0085] The surface composite layer comprises, by weight, Ni: 16, Cr: 4, Co: 8, WC: 22, with the balance being Fe and impurities. The particle size of the surface composite material is 15-45 μm, wherein 0.11≤Co / (Ni+Fe)≤0.38, 0.38≤WC+Co / Ni+Fe≤1.25.

[0086] For the upper winding drum 100:

[0087] Heat the upper drum 100 to 350-450℃ and hold for 1-2 hours. Preheat the welding wire to 200-300℃ and deposit the welding wire onto the surface of the upper drum 100. After welding, temper at 580-620℃ for 1.5-2.5 hours and control the hardness to HRC 35-40.

[0088] The welding wire comprises, by weight, C: 0.38, Si: 0.17, Mn: 0.5, Cr: 0.9, Mo: 0.215, V: 0.12, Nb: 0.12, Ni: 0.45, Ti: 0.1, P: ≤0.035, S: ≤0.035, with the balance being Fe and impurities. The welding wire diameter is Φ1.2mm.

[0089] Among them, 1.31≤(Cr+V+Nb+N i+Mo) / Mn+S i+T i≤3.20, 0.58≤(Cr+Mo) / V+Nb+N i+Mn≤1.22, 1.37≤Cr / N i≤2.67.

[0090] Example 2

[0091] Unlike Example 1:

[0092] The surface composite layer comprises, by weight, Ni: 18, Cr: 5, Co: 12, WC: 32, with the balance being Fe and impurities. The particle size of the surface composite material is 15-45 μm, wherein 0.11≤Co / (Ni+Fe)≤0.38, 0.38≤WC+Co / Ni+Fe≤1.25.

[0093] The welding wire comprises, by weight, C: 0.41, Si: 0.19, Mn: 0.5, Cr: 0.9, Mo: 0.15, V: 0.12, Nb: 0.12, Ni: 0.45, Ti: 0.12, P: ≤0.035, S: ≤0.035, with the balance being Fe and impurities. The welding wire diameter is Φ1.2mm.

[0094] Among them, 1.31≤(Cr+V+Nb+N i+Mo) / Mn+S i+T i≤3.20, 0.58≤(Cr+Mo) / V+Nb+N i+Mn≤1.22, 1.37≤Cr / N i≤2.67.

[0095] Example 3

[0096] Unlike Example 1:

[0097] The surface composite layer comprises, by weight, Ni: 16, Cr: 5, Co: 10, WC: 28, with the balance being Fe and impurities. The particle size of the surface composite material is 15-45 μm, wherein 0.11≤Co / (Ni+Fe)≤0.38, 0.38≤WC+Co / Ni+Fe≤1.25.

[0098] The welding wire comprises, by weight, C: 0.43, Si: 0.19, Mn: 0.8, Cr: 1.2, Mo: 0.15, V: 0.15, Nb: 0.15, Ni: 0.55, Ti: 0.12, P: ≤0.035, S: ≤0.035, with the balance being Fe and impurities. The welding wire diameter is Φ1.2mm.

[0099] Among them, 1.31≤(Cr+V+Nb+N i+Mo) / Mn+S i+T i≤3.20, 0.58≤(Cr+Mo) / V+Nb+N i+Mn≤1.22, 1.37≤Cr / N i≤2.67.

[0100] Example 4

[0101] Unlike Example 1:

[0102] The surface composite layer comprises, by weight, Ni: 20, Cr: 6, Co: 12, WC: 35, with the balance being Fe and impurities. The particle size of the surface composite material is 15-45 μm, wherein 0.11≤Co / (Ni+Fe)≤0.38, 0.38≤WC+Co / Ni+Fe≤1.25.

[0103] The welding wire comprises, by weight, C: 0.45, Si: 0.37, Mn: 0.8, Cr: 1.2, Mo: 0.25, V: 0.18, Nb: 0.18, Ni: 0.65, Ti: 0.15, P: ≤0.035, S: ≤0.035, with the balance being Fe and impurities. The welding wire diameter is Φ1.2mm.

[0104] Among them, 1.31≤(Cr+V+Nb+Ni+Mo) / Mn+Si+Ti≤3.20, 0.58≤(Cr+Mo) / V+Nb+Ni+Mn≤1.22, 1.37≤Cr / Ni≤2.67.

[0105] After 12 months of continuous operation, the lower WC coating of the roll produced according to the above embodiments showed only 0.15mm of wear and no peeling; the upper weld overlay surface was smooth and the wire damage rate was 2.8%.

[0106] Improved wear resistance: The wear resistance of the lower WC coating is more than 3 times higher than that of the pure welding process, and the drum life is extended to 18 months.

[0107] Steel wire protection: The upper weld overlay has moderate hardness, reducing the steel wire damage rate to <3%.

[0108] Cost optimization: Overall maintenance costs reduced by 40%, and downtime frequency reduced by 60%.

[0109] Example 5

[0110] Based on Example 1, the coarsening process was further adjusted in a targeted manner, as follows:

[0111] After roughening treatment, the roll has a uniform network structure on its surface, which consists of forward and reverse spiral patterns. The forward and reverse spiral patterns increase the bonding strength at the coating and welding interfaces.

[0112] Example 6

[0113] Based on Example 1, the spraying structure was designed independently:

[0114] like Figures 2 to 8 As shown, when spraying a high-speed oxygen fuel coating on the surface of the lower drum 200, a clamping mechanism 201 is installed at one end of the lower drum 200. A lifting platform 202 is provided below the clamping mechanism 201. A rotary table 203 and a horizontal rotating mechanism 204 that drives the rotary table 203 to rotate are installed on the lifting platform 202. A rotating spindle 205 that mounts the clamping mechanism 201 and a servo drive assembly 206 that drives the rotating spindle 205 to rotate are installed on the rotary table 203. A lifter 207 is installed at the bottom of the lifting platform 202. The bottom of the lifter 207 is installed on a traveling vehicle 208, and an independent traveling mechanism 209 is installed on the traveling vehicle 208.

[0115] Heating box 211 and heat preservation box 212 are independently provided at both ends of the lower drum 200. Heating box 211 is used to heat the lower drum 200. A side opening is installed at one end of heat preservation box 212. The lower drum 200 enters the heat preservation box 212 through the side opening. A ejector mechanism is installed in heat preservation box 212. The ejector mechanism includes a traveling seat 213 that moves axially along the side opening. A lifting seat 215 and a lifter 214 that drives the lifting seat 215 to move up and down are installed on the traveling seat 213. An ejector pin 216 is installed on the lifting seat 215. The ejector pin 216 is used to abut one end of the lower drum 200.

[0116] A thermal spraying assembly is installed inside the insulation box 212. The thermal spraying assembly includes a spray nozzle 218 for spraying the surface of the lower drum 200. The spray nozzle 218 runs relative to the insulation box 212 in a direction parallel to the axis of the lower drum 200 and is used for spraying the surface of the lower drum 200. An annular air pipe 219 is installed on the outside of the spray nozzle 218. Several air outlets are evenly distributed around the bottom of the annular air pipe 219. The air outlets deviate from the axis of the spray nozzle 218 in the direction close to the lower drum 200. The airflow forms an airflow isolation hood outside the spray nozzle 218 through the air outlets, with the coverage area gradually increasing in the direction close to the lower drum 200, which is used to prolong the floating time of the splashed alloy particles during spraying.

[0117] An airflow channel is provided between the annular air pipe 219 and the spray nozzle 218, and a capturing metal mesh 220 is installed in the airflow channel to capture splashed alloy particles.

[0118] The lower drum 200 is installed on the clamping mechanism 201. First, the lower drum 200 is moved into the heating chamber 211 for preheating. After preheating, it is removed and rotated 180° by the horizontal rotation mechanism 204, so that the lower drum 200 faces the insulation chamber 212. One end of the lower drum 200 is held in place by the ejector pin 216. Insulation spraying is performed inside the insulation chamber 212. During spraying, alloy powder is melted onto the surface of the lower drum 200 through the spray nozzle 218. Simultaneously, the airflow isolation hood creates a relative negative pressure in the spraying area. This negative pressure prolongs the floating time of the splashed alloy particles, appropriately reducing their temperature. The particles are then trapped at the capture metal mesh 220, preventing splashed alloy particles from contaminating the surface to be sprayed. After spraying, the lower drum 200 is removed from the insulation chamber 212 and dismantled.

[0119] In a preferred embodiment, since the edge of the lower roll 200 has an arc-shaped area, how to uniformly spray the arc-shaped area is an urgent problem to be solved. Therefore, the inventors have made the following improvements:

[0120] A ball head structure 221 is installed on the outer side of the spray nozzle 218. The ball head structure 221 is connected to the mounting plate 222. A spherical groove is installed on the mounting plate 222. The ball head structure 221 is installed in the spherical groove. A limiting plate 223 is installed on the mounting plate 222. The limiting plate 223 is fitted on the outer side of the ball head structure 221 and the ball head structure 221 is installed in the spherical groove. An axial guide plate 224 is slidably fitted on the outer side of the mounting plate 222. The axial guide plate 224 is fixedly installed on the inner wall of the insulation box 212. The mounting plate 222 can slide along the axial guide plate 224, thereby cooperating with the rotation of the lower drum 200 to realize the spraying operation of the spray nozzle 218 on the surface.

[0121] A locking sleeve 225 is fitted around the outside of the spray nozzle 218. An electromagnet 226 is embedded in the top of the side of the locking sleeve 225, and a terminal 228 for electrical connection to the electromagnet 226 is provided on its surface. An elastic body 227 is fitted around the outside of the spray nozzle 218, which is located on top of the electromagnet 226. A fixing plate 229 is connected to the top of the elastic body 227. The fixing plate 229 is fixedly installed on the spray nozzle 218. When the terminal 228 is powered on, the electromagnet 226 is energized and attracted to the fixing plate 229. 9. Then, it separates from the limiting plate 223, so that the angle restriction of the spray nozzle 218 is released. When the power is cut off, the locking sleeve 225 moves towards the side closer to the limiting plate 223 under the action of the elastic body 227. Since the bottom of the spray nozzle 218 is heavy, the spray nozzle 218 will return to the initial state, that is, the locking sleeve 225 will correspond to the position of the limiting plate 223 in the direction along the axis of the spray nozzle 218, thereby ensuring that the locking sleeve 225 re-restricts the angle of the spray nozzle 218.

[0122] The insulation box 212 is equipped with a servo motor 230, a servo motor 231, an independent power supply 233, and a drive wheel 232. The end of the servo motor 230 is equipped with a winding reel 234, and a connecting steel rope 235 is wound on the winding reel 234. One end of the connecting steel rope 235 passes over the drive wheel 232 and is connected to the fixed plate 229. The end of the servo motor 231 is equipped with a winding reel 236, and a connecting steel rope 237 is wound on the winding reel 236. One end of the connecting steel rope 237 is connected to the mounting plate 222.

[0123] A positioning plate 238 is installed on the inner wall of the heat preservation box 212. An energized electrode 239 is installed on the positioning plate 238. The energized electrode 239 has an elastic telescopic structure to ensure that the electromagnet 226 is always energized during the rotation of the spray nozzle 218. The energized electrode 239 is connected to an independent power supply 233 via a wire. The energized electrode 239 is used to contact the terminal 228 to electrically connect the electromagnet 226 and the independent power supply 233 to form a closed circuit.

[0124] The movement of the spray nozzle 218 is driven by servo motor 230, servo motor 231, take-up reel 234, connecting steel cable 235, and connecting steel cable 237 to move axially along the lower drum 200. It should be noted that during axial movement, servo motor 230 and servo motor 231 perform a take-up and release action. When the nozzle moves to the edge of the curved part, the circuit is connected by the energized electrode 239 and terminal 228, releasing the angle limitation of the spray nozzle 218. At this time, the servo motor 230 continuously rewinds the connecting steel cable 235 to perform targeted spraying operations on the curved part.

[0125] The spraying steps for the lower roll 200 are as follows:

[0126] S311, preheating

[0127] The lower drum 200 is mounted on the traveling carriage 208 via the clamping mechanism 201, and the lower drum 200 is moved into the heating box 211 via the independent traveling mechanism 209 on the traveling carriage 208, and preheated to 150-200℃.

[0128] S312, thermal insulation

[0129] After the lower drum 200 is preheated to 150-200℃, the traveling carriage 208 removes the lower drum 200 from the heating box 211 and immediately rotates the lower drum 200 180° horizontally via the horizontal rotation mechanism 204, so that the lower drum 200 faces the insulation box 212. The lower drum 200 is axially positioned by the pin mechanism on the traveling seat 213 in the insulation box 212. Then, the traveling carriage 208 and the traveling seat 213 move simultaneously to move the lower drum 200 into the insulation box 212. The end of the lower drum 200 is attached to the positioning plate 238. Rolling elements are installed on the side wall of the positioning plate 238 to attach to the end face of the lower drum 200. The lifting device 207 and the lifting device 214 work simultaneously to drive the lower drum 200 to a predetermined height. The predetermined height is when the center of the ball head structure 221 and the center of the arc-shaped area at the edge of the lower drum 200 are on the same horizontal line.

[0130] S313, spraying

[0131] The servo drive assembly 206 drives the rotating spindle 205 to rotate at a constant speed. Simultaneously, the spray nozzle 218 operates, spraying the surface of the lower drum 200. At the same time, servo motors 230 and 231 start, driving take-up reels 234 and 236 to rotate in opposite directions. Through the connecting steel cable 235, the spray nozzle 218 moves at a constant speed along the axis of the rotating spindle 205. When the spray nozzle 218 moves to the arc-shaped area at the edge of the lower drum 200... When the boundary of the domain is reached, the terminal 228 and the energized electrode 239 contact to connect the circuit of the electromagnet 226. The electromagnet 226 is energized and attracts the fixed plate 229 at the top, and compresses the elastic body 227. The axial restriction of the ball head structure 221 is released. After the axial restriction is released, the spray nozzle 218 rotates around the ball head structure 221 under the traction of the connecting steel rope to perform spraying operations on the arc-shaped area. At the same time as the spray nozzle 218 rotates, the servo motor 231 will not continue to drive the mounting plate 222 to continue to move along the axial direction of the lower drum 200.

[0132] S314, demolition

[0133] Servo motor 230 first rotates in the opposite direction, and the spray nozzle 218 returns to the vertical position under the action of gravity. At this time, the spray nozzle 218 returns to the top of the arc-shaped area boundary. Then, servo motor 231 starts and runs in the opposite direction together with servo motor 230. At the same time, terminal 228 and energized electrode 239 separate. Locking sleeve 225 restricts the angle of spray nozzle 218 axially again under the action of elastic body 227. As servo motor 231 and servo motor 230 run synchronously, the mounting plate 222 is reset to the initial state. Lifter 207 and lifting device 214 open at the same time to lower the lower drum 200 to the initial height. Traveling carriage 208 and traveling seat 213 move synchronously to the outside of insulation box 212. The traveling component continues to move, causing one end of the lower drum 200 to disengage from the ejector pin 216. After disengagement, the clamping mechanism 201 is released to remove the lower drum 200 from it.

[0134] Example 7

[0135] Based on Example 1, the weld overlay structure of the upper drum 100 is designed independently:

[0136] like Figures 9 to 10 As shown, when welding the upper drum 100, a clamping fixture 101 is installed at one end of the upper drum 100 and an axial telescopic ejector pin 102 is installed at the other end. The clamping fixture 101 is installed at one end of the rotary spindle 103. The axial telescopic ejector pin 102 and the rotary spindle 103 are both installed on the movable seat 104. The movable seat 104 is equipped with a servo driver 105 that drives the rotary spindle 103 to rotate and an electric drive walking assembly 106 that drives the movable seat 104 to move along the axial direction of the upper drum 100. A second heating box 107 is independently provided on the outside of the upper drum 100. The two ends and the bottom of the second heating box 107 are open structures.

[0137] The heating chamber 2 107 is equipped with an upper heat insulation plate 108, a lower heat insulation plate 118, and a heater 119 for heating the upper drum 100. A gap is reserved between the upper heat insulation plate 108 and the lower heat insulation plate 118. The upper heat insulation plate 108 and the lower heat insulation plate 118 are located on the top inner side of the heating chamber 2 107.

[0138] Both the upper heat insulation plate 108 and the lower heat insulation plate 118 are provided with slots parallel to the axis of the upper roller 100, and welding guns 111 are independently installed in the slots of the upper heat insulation plate 108 and the lower heat insulation plate 118.

[0139] A toothed plate 109 and a limiting strip 110 are installed on one side of the top of the slot of the upper heat insulation plate 108 and the lower heat insulation plate 118, and a vertical plate 121 is installed between the upper heat insulation plate 108 and the lower heat insulation plate 118. A guide groove 122 is installed on the vertical plate 121, and a sliding pin is installed on the side of the welding torch 111. The sliding pin is slidably engaged in the guide groove 122.

[0140] Two connecting sleeves 112 are installed on the outside of the welding torch 111. Each connecting sleeve 112 has a rotating shaft 113 connected to one side via a bearing. A gear 114 is mounted on the rotating shaft 113 and meshes with the rack plate 109. The end of the rotating shaft 113 away from the connecting sleeve 112 is connected to a moving block 116 via a bearing. The moving block 116 and the limiting strip 110 slide together. Each moving block 116 is equipped with a rotary motor 115, and one end of the rotary motor 115 is connected to the rotating shaft 113.

[0141] The guide groove 122 includes a horizontal segment 1221, an arc segment one 1222, an arc segment two 1223, and an arc segment three 1224. The arc segments one 1222 and three 1224 are symmetrically distributed on both sides of the arc segment two 1223. The centers of the arc segments one 1222 and three 1224 are located on the boundaries of the two sides of the lead groove, respectively. The center of the arc segment two 1223 is located directly behind the center of the arc surface of the lead groove.

[0142] The welding process for the upper drum 100 is as follows:

[0143] S321, preheating

[0144] One end of the upper drum 100 is mounted on the clamping fixture 101, and the other end is connected by an axial telescopic ejector pin 102. The upper drum 100 is moved into the heating box 107 by the electric drive walking component 106 on the moving seat 104. The heater inside heats the upper drum 100 to 350-450℃. The rotary spindle 103 rotates at timed intervals under the action of the servo drive 105 and is kept warm for 1-2 hours.

[0145] S321, wire feeding

[0146] The wire feeding mechanism 119 feeds the welding wire into the end of the welding gun 111. During the wire feeding process, the welding wire is heated to 200-300°C by the heating film tube 118 at the wire outlet.

[0147] S322, weld overlay

[0148] The rotary spindle 103 rotates at a constant speed under the action of the servo driver 105, and the welding gun 111 welds the welding wire onto the upper drum 100. At the same time, the two rotary motors 115 run synchronously and at the same speed along the direction parallel to the axis of the upper drum 100.

[0149] When the circuit reaches the boundary of the lead wire groove, the rotary motors 115 corresponding to the upper and lower connecting sleeves 112 continue to run, and the running speed of the upper rotary motor 115 is greater than that of the lower rotary motor 115. The sliding pin will enter the arc section 1222 from the horizontal section 1221. The welding torch 111 completes the angle adjustment at this point within the time it takes for the upper drum 100 to rotate one revolution. At this time, the rotation center of the upper connecting sleeve 112 is located at the center of the arc surface of the lead wire groove.

[0150] Subsequently, the rotary motor 115 corresponding to the upper connecting sleeve 112 stops running, and the rotary motor 115 corresponding to the lower connecting sleeve 112 runs independently. The sliding pin enters the arc segment 2 1223, and the welding gun 111 performs arc surface welding around the lead wire groove.

[0151] When the cable reaches the other boundary of the lead groove, the rotary motor 115 corresponding to the upper connecting sleeve 112 starts running again, and the running speed of the upper rotary motor 115 is greater than that of the lower rotary motor 115. The welding torch 111 completes the angle adjustment at this point within the time it takes for the upper drum 100 to rotate one revolution. The sliding pin enters the next horizontal section 1221 through the arc section three 1224.

[0152] S323, dismantling

[0153] After the upper drum 100 is welded, the moving seat 104 moves the upper drum 100 out of the heating box via the electric drive walking assembly 106, removes it and transfers it to the tempering furnace, where it is tempered at 580-620℃ for 1.5-2.5 hours, and the hardness is controlled to HRC 35-40.

Claims

1. A method of processing the surface of a roll based on a layered composite process, characterized in that, The reel comprises an upper reel (100) and a lower reel (200); Step 1, surface cleaning The surface of the reel is cleaned to expose the metal luster, the surface is cleaned by a cleaning agent, and the surface is dried; Step 2, roughening The surface of the reel is roughened to a Sa3 level of cleanliness; Step 3, differential surface treatment of the reel For the lower reel (200): The lower reel (200) is preheated to 150-200 DEG C, a surface composite layer is obtained by high-speed oxygen fuel spraying, the spraying distance is 120-200 mm, the powder feeding rate is 30-50 g / min, and the final surface composite layer hardness is controlled to be HRC 60-65; The components of the surface composite layer include, by weight, Ni: 16-20, Cr: 4-6, Co: 8-15, WC: 22-35, and the balance of Fe and impurities, and the particle size of the surface composite material is 15-45 μm, wherein 0.11≤Co / (Ni+Fe)≤0.38 and 0.38≤(WC+Co) / (Ni+Fe)≤1.25; For the upper reel (100): The upper reel (100) is heated to 350-450 DEG C and kept for 1-2 h, the welding wire is preheated to 200-300 DEG C, the upper reel (100) is surfacing welded with the welding wire, and after welding, the upper reel (100) is tempered at 580-620 DEG C for 1.5-2.5 h, and the hardness is controlled to be HRC 35-40; The components of the welding wire include, by weight, C: 0.38-0.45, Si: 0.17-0.37, Mn: 0.50-0.80, Cr: 0.90-1.20, Mo: 0.15-0.25, V: 0.12-0.18, Nb: 0.12-0.18, Ni: 0.45-0.65, Ti: 0.10-0.15, P: ≤0.035, S: ≤0.035, and the balance of Fe and impurities, and the diameter of the welding wire is Φ1.2 mm; Wherein, 1.31≤(Cr+V+Nb+Ni+Mo) / (Mn+Si+Ti)≤3.20, 0.58≤(Cr+Mo) / (V+Nb+Ni+Mn)≤1.22, and 1.37≤Cr / Ni≤2.

67.

2. A method of treating the surface of a roll according to claim 1, characterized in that, After the roughening treatment of the reel, a uniform network structure is formed on the surface, and the network structure is composed of forward spiral lines and reverse spiral lines.

3. A method of treating the surface of a roll according to claim 1, wherein When the lower reel (200) is high-speed oxygen fuel sprayed to form a surface composite layer, one end of the lower reel (200) is provided with a clamping mechanism (201), a lifting table (202) is arranged below the clamping mechanism (201), a rotating table (203) and a horizontal rotating mechanism (204) for driving the rotating table (203) to rotate are arranged on the lifting table (202), a rotating main shaft (205) for mounting the clamping mechanism (201) and a servo driving assembly (206) for driving the rotating main shaft (205) to rotate are arranged on the rotating table (203), a lifter (207) is arranged at the bottom of the lifting table (202), the lifter (207) is arranged on a walking vehicle (208), and an independent walking mechanism (209) is arranged on the walking vehicle (208). Two ends of the lower winding drum (200) are independently provided with a heating box I (211) and a heat preservation box I (212), the heating box I (211) is used for heating operation of the lower winding drum (200), one end of the heat preservation box I (212) is provided with a side opening, the lower winding drum (200) enters the heat preservation box I (212) through the side opening, a thimble mechanism is installed in the heat preservation box I (212), the thimble mechanism comprises a walking seat (213) moving axially along the side opening, a lifting seat (215) is installed on the walking seat (213), a lifting device (214) driving the lifting seat (215) to move up and down, a thimble piece (216) is installed on the lifting seat (215), and the thimble piece (216) is used for being top-mounted on one end of the lower winding drum (200); A thermal spraying assembly is installed in the heat preservation box I (212), the thermal spraying assembly comprises a spraying nozzle (218) used for spraying operation on the surface of the lower winding drum (200), the spraying nozzle (218) moves along a direction parallel to the axis of the lower winding drum (200) relative to the heat preservation box I (212), an annular air pipe (219) is installed on the outside of the spraying nozzle (218), a plurality of air outlet holes are uniformly distributed on the bottom of the annular air pipe (219) in the circumferential direction, the air outlet holes deviate from the axis of the spraying nozzle (218) outward in a direction close to the lower winding drum (200), and airflow forms an airflow isolation cover gradually increasing in coverage area in the direction close to the lower winding drum (200) outside the spraying nozzle (218) through the air outlet holes, so that the floating time of splashed alloy particles during spraying is prolonged.

4. A method of treating the surface of a roll according to claim 3, wherein A airflow channel is reserved between the annular air pipe (219) and the spraying nozzle (218), and a metal capturing net (220) is clamped in the airflow channel and used for capturing splashed alloy particles.

5. A method of treating the surface of a roll according to claim 3, wherein A ball head structure (221) is installed on the outside of the spraying nozzle (218), the ball head structure (221) is connected to a mounting plate (222), the mounting plate (222) is provided with a spherical groove, the ball head structure (221) is installed in the spherical groove, a limiting plate (223) is installed on the mounting plate (222), the limiting plate (223) is sleeved on the outside of the ball head structure (221) and installs the ball head structure (221) in the spherical groove, an axial guide plate (224) is slidingly fitted on the outside of the mounting plate (222), the axial guide plate (224) is fixedly installed on the inner wall of the heat preservation box I (212), a locking sleeve (225) is sleeved on the outside of the spraying nozzle (218), an electromagnet (226) is embedded on the top of the side of the locking sleeve (225) and provided with a terminal (228) electrically connected with the electromagnet (226), an elastic body (227) is sleeved on the outside of the spraying nozzle (218) on the top of the electromagnet (226), a fixed disc (229) is connected to the top of the elastic body (227), and the fixed disc (229) is fixedly installed on the spraying nozzle (218); The servo motor one (230) and the servo motor two (231) are installed on the heat preservation box one (212), and the independent power supply (233) and the transmission wheel (232) are installed on the heat preservation box one (212), the end of the servo motor one (230) is provided with the winding disc one (234), the winding disc one (234) is provided with the connecting steel wire one (235), one end of the connecting steel wire one (235) is connected to the fixed disc (229) through the transmission wheel (232), the end of the servo motor two (231) is provided with the winding disc two (236), the winding disc two (236) is provided with the connecting steel wire two (237), one end of the connecting steel wire two (237) is connected to the mounting plate (222); The positioning plate (238) is installed on the inner wall of the heat preservation box one (212), the positioning plate (238) is provided with the current-carrying electrode (239), the current-carrying electrode (239) is connected to the independent power supply (233) through the wire, and the current-carrying electrode (239) is used for contacting the terminal (228) to electrically connect the electromagnet (226) and the independent power supply (233) to form a closed loop.

6. A method of treating the surface of a log based on a layered composite process according to claim 5, characterized in that, The spraying step of the lower winding drum (200) is as follows: S311, preheating The lower winding drum (200) is installed on the walking vehicle (208) through the clamping mechanism (201), and the lower winding drum (200) is driven to move into the heating box one (211) through the independent walking mechanism (209) on the walking vehicle (208), and is preheated to 150-200 DEG C; S312, heat preservation After the lower winding drum (200) is preheated to 150-200 DEG C, the walking vehicle (208) removes the lower winding drum (200) from the heating box one (211) and immediately completes the rotation of 180 DEG in the horizontal direction of the lower winding drum (200) through the horizontal rotation mechanism (204), and the lower winding drum (200) is towards the heat preservation box one (212), the lower winding drum (200) is moved into the heat preservation box one (212) through the thimble mechanism on the walking seat (213) in the heat preservation box one (212), the end of the device lower winding drum (200) and the positioning plate (238) are attached, the positioning plate (238) is provided with the rolling body on the side wall for attaching to the end surface of the lower winding drum (200), the lifter (207) and the lifting device (214) work simultaneously to drive the lower winding drum (200) to rise to a predetermined height, the center of the ball head structure (221) and the arc region of the lower winding drum (200) edge position are on the same horizontal line; S313, spraying The servo drive assembly (206) drives the rotating main shaft (205) to rotate at a constant speed. The spraying nozzle (218) works at the same time to spray the surface of the lower winding drum (200). At the same time, the servo motor one (230) and the servo motor two (231) are started to drive the winding disc one (234) and the winding disc two (236) to rotate. The rotating directions of the winding disc one (234) and the winding disc two (236) are opposite. The connecting steel wire one (235) drives the spraying nozzle (218) to move at a constant speed along the axis direction of the rotating main shaft (205). When the spraying nozzle (218) moves to the boundary of the arc-shaped area at the edge position of the lower winding drum (200), the terminal (228) and the power electrode (239) contact to connect the circuit of the electromagnet (226). The electromagnet (226) is energized to adsorb the fixed disc (229) at the top and compress the elastic body (227). The axial restriction of the ball head structure (221) is released. After the axial restriction is released, the spraying nozzle (218) rotates around the ball head structure (221) under the traction of the connecting steel wire to spray the arc-shaped area. At the same time of the rotating movement of the spraying nozzle (218), the servo motor two (231) does not continue to drive the mounting plate (222) to move along the axis direction of the lower winding drum (200); S314, disassembly The servo motor one (230) is first reversely rotated, and the spraying nozzle (218) is reset to a vertical state under the action of gravity. At this time, the spraying nozzle (218) is above the boundary of the arc-shaped area. Then the servo motor two (231) is started and reversely runs together with the servo motor one (230). At the same time, the terminal (228) and the power electrode (239) are separated. The locking sleeve (225) restricts the angle of the spraying nozzle (218) under the action of the elastic body (227). With the synchronous operation of the servo motor two (231) and the servo motor one (230), the mounting plate (222) is reset to the initial state. The elevator (207) and the lifter (214) are opened at the same time to lower the lower winding drum (200) to the initial height. The walking vehicle (208) and the walking seat (213) are moved to the outside of the heat preservation box one (212) at the same time. The walking member continuously moves to drive one end of the lower winding drum (200) to separate from the thimble member (216). After separation, the clamping mechanism (201) is loosened to disassemble the lower winding drum (200) from it.

7. A method of treating the surface of a roll according to claim 1, wherein When the upper winding drum (100) is surfacing, one end of the upper winding drum (100) is provided with a clamping jig (101), and the other end is provided with an axial telescopic thimble (102). The clamping jig (101) is installed at one end of the rotary main shaft (103). The axial telescopic thimble (102) and the rotary main shaft (103) are both installed on the moving seat (104). The moving seat (104) is provided with a servo drive (105) for driving the rotary main shaft (103) to rotate and an electric drive walking assembly (106) for driving the moving seat (104) to move along the axis direction of the upper winding drum (100). The outer side of the upper winding drum (100) is independently provided with a heating box two (107). The two ends and the bottom of the heating box two (107) are provided with an open structure. The inside of the heating box two (107) is provided with an upper heat insulation plate (108), a lower heat insulation plate (118) and a heater (119) for heating the upper winding drum (100), a gap is reserved between the upper heat insulation plate (108) and the lower heat insulation plate (118), and the upper heat insulation plate (108) and the lower heat insulation plate (118) are arranged at the top of the inside of the heating box two (107); The upper heat insulation plate (108) and the lower heat insulation plate (118) are provided with notches parallel to the axis of the upper winding drum (100), and the notches of the upper heat insulation plate (108) and the lower heat insulation plate (118) are independently provided with welding guns (111); The upper heat insulation plate (108) and the lower heat insulation plate (118) are provided with a rack plate (109) and a limiting strip (110) on one side of the top of the notches, and a vertical plate (121) is arranged between the upper heat insulation plate (108) and the lower heat insulation plate (118), the vertical plate (121) is provided with a guide groove (122), the welding gun (111) is provided with a sliding pin, and the sliding pin is slidingly fitted in the guide groove (122); The welding gun (111) is provided with two connecting sleeves (112) on the outside, one side of each connecting sleeve (112) is connected with a rotating shaft (113) through a bearing, the rotating shaft (113) is provided with a gear (114), the gear (114) is engaged on the rack plate (109), and the end of the rotating shaft (113) away from the connecting sleeve (112) is connected with a moving block (116) through a bearing, the moving block (116) and the limiting strip (110) are slidingly fitted, and each moving block (116) is provided with a rotating motor (115), one end of the rotating motor (115) is connected with the rotating shaft (113).

8. A method of treating the surface of a log based on a layered composite process according to claim 7, characterized in that, The guide groove (122) comprises a horizontal segment (1221), a first circular arc segment (1222), a second circular arc segment (1223) and a third circular arc segment (1224), the first circular arc segment (1222) and the third circular arc segment (1224) are symmetrically arranged on the two sides of the second circular arc segment (1223), the centers of the first circular arc segment (1222) and the third circular arc segment (1224) are located on the boundaries of the two sides of the lead groove, and the center of the second circular arc segment (1223) is located directly behind the center of the arc surface of the lead groove.

9. A method of treating the surface of a log based on a layered composite process according to claim 8, characterized in that, The notches are provided with two pieces of organ type heat insulation sheets (120) and a moving body (117) connecting the two pieces of organ type heat insulation sheets (120), the moving body (117) is slidingly sleeved on the outside of the welding gun (111), a ball (123) is slidingly installed in the moving body (117) on the outside of the welding gun (111), and the ball (123) is slidingly sleeved on the outside of the welding gun (111).

10. A method of treating the surface of a log based on a layered composite process according to claim 9, characterized in that, The overlaying welding step of the upper winding drum (100) is as follows: S321, preheating One end of the upper winding drum (100) is installed on the clamping fixture (101), and the other end is connected with the axial telescopic pin (102). The upper winding drum (100) is moved into the heating box two (107) by moving the seat (104) through the electric drive walking assembly (106), and the internal heater (119) heats the upper winding drum (100) to 350-450℃. The rotary main shaft (103) rotates regularly under the action of the servo driver (105), and the temperature is kept for 1-2h; S321, wire feeding The wire feeding mechanism (119) feeds the welding wire into the end of the welding gun (111), and the welding wire is heated to 200-300℃ by the heating film tube (118) at the wire outlet during the wire feeding process; S322, surfacing The rotary main shaft (103) rotates at a constant speed under the action of the servo driver (105), and the welding gun (111) welds the welding wire on the upper winding drum (100), while the two rotary motors (115) run at the same speed along the parallel axis direction of the upper winding drum (100); When running to the boundary of the lead groove, the rotary motor (115) corresponding to the upper connecting sleeve (112) and the lower connecting sleeve (112) continues to run, and the running speed of the upper rotary motor (115) is greater than that of the lower rotary motor (115). The sliding pin will enter the circular arc segment one (1222) from the horizontal segment (1221), and the welding gun (111) will complete the angle adjustment within one rotation of the upper winding drum (100). At this time, the rotation center of the upper connecting sleeve (112) is located at the center of the arc surface of the lead groove; Subsequently, the rotary motor (115) corresponding to the upper connecting sleeve (112) stops running, and the rotary motor (115) corresponding to the lower connecting sleeve (112) runs alone, and the sliding pin enters the circular arc segment two (1223). The welding gun (111) performs surfacing work around the arc surface of the lead groove; When running to the other boundary of the lead groove, the rotary motor (115) corresponding to the upper connecting sleeve (112) starts to run again, and the running speed of the upper rotary motor (115) is greater than that of the lower rotary motor (115). The welding gun (111) completes the angle adjustment within one rotation of the upper winding drum (100), and the sliding pin enters the next horizontal segment (1221) through the circular arc segment three (1224). S323, disassembly After the surfacing of the upper winding drum (100) is completed, the moving seat (104) moves the upper winding drum (100) out of the heating box through the electric drive walking assembly (106), and is disassembled to the tempering furnace. After tempering at 580-620℃ for 1.5-2.5h, the hardness is controlled to HRC 35-40.

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