Technique for restoring precision of stepped cushion of rolling mill by adopting laser cladding technology
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A technology of laser cladding and process method, applied in the field of laser repair, can solve the problem of not seeing, and achieve the effects of simple operation, recovery of dimensional accuracy, and improvement of large wear amount
Active Publication Date: 2019-03-15
SHENYANG DALU LASER TECH
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Problems solved by technology
[0009] According to the applicant's search and verification: there is no domestic precedent for using laser c
Method used
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Embodiment 1
[0040] Example 1 The laser treatment of step pads in the X steel factory restores precision.
[0041] The base material of the step pad is 34CrNi3Mo.
[0042] (1) Sand blast and derust the surface of the step mat to expose the metal surface.
[0043] (2) Carry out mechanical processing in advance to remove corrosion, worn surface and fatigue layer (after processing to the lowest point of corrosion, then process 0.3-0.5mm).
[0044] (3) Hardness testing to determine the thickness of the fatigue layer
[0045] Hardness HB ≤ 290 can remove the fatigue layer, size measurement wear is about 5mm, non-destructive testing, no cracks on the surface by naked eyes, and a small number of pores (less than 5 pores <Φ2 are allowed per square decimeter) can be judged Can be laser repaired.
[0046] (4) Post-processing inspection: After removing the fatigue layer in the previous mechanical processing, pores were found, and laser repair welding was performed on the pores. The repair welding ...
Embodiment 2
[0060] Example 2 The laser treatment of step pads in the X steel factory restores precision.
[0061] The base material of the step pad is 34CrNi3Mo.
[0062] (1) Clean and derust the step pad.
[0063] (2) Pre-repair size and hardness testing to determine the amount of wear. After the non-destructive testing is confirmed, laser repair can be performed (after the size is measured, the amount of wear is determined to be about 2.5mm).
[0064] (3) Carry out mechanical processing to remove fatigue layers such as corrosion and wear on the surface.
[0065] (4) The fatigue layer is removed by mechanical processing in the early stage, and the surface of the processed part is non-destructively inspected after processing, and there are no cracks, pores and other defects.
[0066] (5) Use a gas laser to laser clad the surface of the step pad. Laser cladding process: ①. Materials: bottom metal powder FM1, surface layer metal powder FM2; ②. Pay attention to the quality and power change...
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Abstract
The invention belongs to the field of laser repairing and particularly relates to a technique for restoring the precision of a stepped cushion of a rolling mill by adopting a laser cladding technology. The technique is specifically implemented by the following steps of: surface derusting, detection before repair, processing for removing surface fatigue layers, detection after processing, determination of a laser cladding process (including technological parameters and alloy powder constituents), detection after laser cladding, rough and fine machining, and detection after repair; the techniqueis simple and convenient to operate, greatly alleviates the labor intensity, has the characteristics of restoring the dimensional precision of the original design and improving the corrosion resistance and the wear resistance of the surface, improves the overall use efficiency, has quite small influences on the surface and prevents relatively large deformation; after being machined by a grindingmachine, the surface is smooth, uniform and high in glossiness; after repairing, a product is tracked and detected; the dimensional precision of the stepped cushion can be restored after laser cladding; the running cost is low; the surface is free of detection flaws and cracks after being machined; the product can meet the requirements of normal use; and the service life of the product is prolonged by at least three times.
Description
technical field [0001] The invention relates to a process method for recovering the precision of rolling mill step pads by laser cladding technology, which belongs to the field of laser repair. Background technique [0002] The step pad is a device installed in the frame of the hot rolling mill in the steel mill, which is used to adjust the height of the lower back-up roll. There are two kinds of integral type (a step mat is composed of multiple steps) or split type (each block is a thickness dimension, and multiple blocks form a ladder). There is a certain height difference between each step surface, and the manufacturing material has a high alloy structure. There are two kinds of steel and martensitic stainless steel, the main material is 34CrNi3Mo, the surface hardening forms include carburizing, nitriding and surface quenching, etc. During operation, the rolling slab temperature ranges from 600 to 1200 °C with high-speed splashing of iron oxide scale and A large amount ...
Claims
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Application Information
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