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A technology of wear-resistant coating and laser cladding, which is applied in the coating process and coating of metal materials, can solve problems such as pinch roller wear, achieve the effects of improving quality, grain refinement, and saving processing time
Pending Publication Date: 2020-09-29
NANJING ZHONGKE RAYCHAM TECH
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[0005] The purpose of the present invention is to solve the problem of severe wear of plate pinch rollers in the metallurgical industry in the prior art, and to provide a wear-resistant Fe-Cr alloy powder material and coating preparation process for laser cladding on the surface of pinch rolls in steel mills, which can Significantly improve the wear resistance of the pinch roller surface, prolong the service life of components, and improve the surface corrosion resistance
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Embodiment 1
[0059] In this example, the laser cladding powder material is mixed according to the aforementioned ratio, and the mixing time is 1h by using an electromagnetic mixer. A new pinch roller without surface strengthening was selected as the test workpiece for laser cladding, and the material was 45 steel.
[0060] The laser cladding experiment adopts ZKYC-LCD-4000 laser remanufacturing equipment: KUKA60-3 robot, YC52 coaxial powder feeding processing head, Laserline semiconductor 4000W laser, MCWL-120DT2 water cooler and RC-PGF-D-2 double barrel powder feeder. The main process parameters of laser cladding are:
[0061] The first layer (bottom layer): laser power 2.1kW, spot size 5mm, scanning speed 1200mm / min, protective gas selection argon, flow rate 40ml / min, the bottom of the processing head is 40mm away from the surface of the workpiece; the cladding track is: the workpiece rotates continuously , the cladding head is fed in a straight line, and the cladding layer overlap rat...
Embodiment 2
[0065] The laser cladding powder material is mixed according to the aforementioned ratio, and the mixing time is 1h by using an electromagnetic mixer. The pinch roll is also selected as the base material for laser cladding.
[0066] The laser cladding experiment adopts ZKYC-LCD-4000 laser remanufacturing equipment: KUKA60-3 robot, YC52 coaxial powder feeding processing head, Laserline semiconductor 4000W laser, MCWL-120DT2 water cooler and RC-PGF-D-2 double barrel powder feeder. The main process parameters of laser cladding are:
[0067] The first layer (bottom layer): laser power 2.1kW, spot size 5mm, scanning speed 1200mm / min, argon as shielding gas, flow rate 40ml / min, the bottom of the processing head is 40mm from the surface of the workpiece; workpiece rotation, cladding processing head straight line The feeding and cladding tracks adopt two helical lines interlaced. The first helical line starts from one end of the pinch roller, and the distance between channels is 1 / 2...
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Abstract
The invention relates to the technical field of laser cladding additive manufacturing, and discloses a steel mill pinch roll surface laser cladding Fe-Cr alloy wear-resistant coating preparation technology. The steel mill pinch roll surface laser cladding Fe-Cr alloy wear-resistant coating preparation technology comprises the steps that spherical powder is prepared by powder materials by molar mass percentage; an electromagnetic power mixing device is used for mixing powder, and the grain size is 45-105[mu]m; the number of cladding layers of laser cladding is 2, a cladding track of a first layer cladding layer adopts the alternating mode of two spiral lines, the first spiral line is started from one end of a pinch roll, and after the operation of a first spiral line track is completed, a second spiral line is started from the other end; and a second layer of the cladding layers adopts the partition cladding mode, symmetric cladding is carried out according to four areas, and stress relief treatment is carried out by adopting vibration aging equipment in the cladding process of each area. Through the combination of the blending of the powder materials and the cladding mode, by combining with the synchronous vibration aging treatment, the wear-resisting property and average Rockwell hardness of surface coatings of the pinch roll can be improved, the coating quality is improved, and a change cycle of parts on a production line is prolonged.
Description
technical field [0001] The invention relates to the technical field of laser cladding additive manufacturing, in particular to a preparation process for laser cladding Fe-Cr alloy wear-resistant coating on the surface of pinch rollers in steel mills. Background technique [0002] The pinch roll device in the steel mill is used to help the head of the wire rolled out of the finishing mill enter the laying machine to form a loop, and prevent the high-speed running wire tail from the rolling mill from being accelerated due to detachment from the restraint and causing a pile of steel to block the accident. The pinch roller is composed of upper and lower rollers, upper roller opening and closing device, roll gap adjustment device and pinch roller structure transmission device. [0003] In order to improve the biting conditions and make the head of the strip bend downward, the pinch rollers are a pair of rollers with a large top and a small bottom. After the roll, the head is for...
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