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An online recovery method for tapered hole defects on the surface of crystallization rolls

A technology of tapered holes and crystal rollers, applied in the direction of pressure inorganic powder coating, etc., can solve the problems of conical hole defects, repair coating failure, bridging, disappearance, etc., to shorten the repair cycle, reduce repair costs, repair The effect of improving efficiency

Active Publication Date: 2017-06-23
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the cold spraying repair of the crystal roller is to clamp the workpiece on the rotary machine tool or fixed special fixture, and realize the repair of the entire surface through the mutual movement between the spray gun and the workpiece. Influenced by uncertain factors such as the uniformity of spray powder particles and parameter fluctuations, it is very easy to generate conical hole defects 3 on the surface of the repair layer 2 on the crystallization roller 1, and its typical appearance is as follows figure 1 shown
Once the tapered hole defect is formed, it cannot be healed and disappeared in the conventional repair process, and will continue to grow with the spraying process, which will eventually lead to the failure of the entire repair coating and cause huge economic losses

Method used

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  • An online recovery method for tapered hole defects on the surface of crystallization rolls
  • An online recovery method for tapered hole defects on the surface of crystallization rolls
  • An online recovery method for tapered hole defects on the surface of crystallization rolls

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Experimental program
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Effect test

Embodiment 1

[0040] 1) The surface repair layer of the crystallization roller is CrZrCu alloy, and the diameter of the tapered hole defect is The depth is 4mm, and the method of combining drilling and grinding is used to process it into a diameter For a columnar flat-bottomed hole with a depth of h=5mm, the inner wall roughness is Ra0.6μm; use the quenched Cr12MoV steel wire tap to process the inner wall texture, and process it into a wave texture structure. The distance between adjacent textures is A=2.5mm, and the peak-to-valley difference B= 0.25mm.

[0041] 2) The utilization pressure value is 0.4MPa, the preheating temperature is 50°C, and the oil content is less than 0.8mg / m 3 , The gas-solid two-phase flow formed by compressed air with a maximum dust particle size of less than 0.6 μm and sintered α-alumina particles with a particle size of 300 μm is used for inner wall grinding. The powder feeding rate of ceramic particles is 0.2 L / h, and the impact The speed is 128m / s, and the ...

Embodiment 2

[0045] 1) The repair layer on the surface of the crystallization roller is BeNiCu alloy, and the diameter of the tapered hole defect is The depth is 5mm, and the method of combining drilling and grinding is used to process it into a diameter A columnar flat-bottomed hole with a depth of h=5.5mm, and the inner wall roughness is Ra0.7μm; use a V4 steel wire tap to process the inner wall texture, and process it into a wave texture structure, the distance between adjacent textures is A=2.0mm, and the peak-to-valley difference B=0.35mm .

[0046] 2) The utilization pressure value is 0.5MPa, the preheating temperature is 45°C, and the oil content is less than 0.7mg / m 3 , The gas-solid two-phase flow formed by compressed air with a maximum dust particle size of less than 0.8 μm and zirconia particles with a particle size of 360 μm is used for inner wall grinding. Among them, the feeding rate of ceramic particles is 0.5L / h, and the impact speed is 106m / s , spherical ceramic partic...

Embodiment 3

[0050] 1) The surface repair layer of the crystal roller is pure copper, and the diameter of the tapered hole defect is The depth is 6mm, and the corundum grinding head with a grain size of 120μm is directly ground to a diameter For columnar flat-bottomed holes with a depth of h=7mm, the inner wall roughness is Ra0.45μm; the inner wall texture is processed by high-speed steel wire tapping, and processed into a wave texture structure, the distance between adjacent textures is A=2.2mm, and the peak-to-valley difference B=0.5mm.

[0051] 2) The utilization pressure value is 0.7MPa, the preheating temperature is 80°C, and the oil content is less than 0.9mg / m 3 , The gas-solid two-phase flow formed by compressed air with a maximum dust particle size of less than 0.5 μm and silicon carbide particles with a particle size of 580 μm is used for inner wall grinding. Among them, the feeding rate of ceramic particles is 0.8L / h, and the impact speed is 60m / s , spherical ceramic particle...

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Abstract

An online recovery method for conical hole defects on the surface of a crystallization roller, comprising the following steps: processing the inner wall of the conical hole defect on the surface of the crystallization roller into a columnar flat-bottomed hole, and then processing a wave texture structure distributed at equal intervals on the inner wall; and then using high-pressure gas Smooth and roughen the wavy texture structure with ceramic particles; finally, use the same metal particles as the surface repair layer of the crystallization roller to hit the bottom and inner wall of the columnar flat-bottomed hole to achieve online rapid restoration. The entire repairing process of the present invention has no thermal influence on the base of the crystallization roller, and the repairing area of ​​the tapered hole defect is consistent with the microstructure of the repairing layer on the surface of the crystallization roller, effectively avoiding the generation of extra stress, and the bonding strength of the two is increased by more than 30%, and the thermal The fatigue strength is increased by more than 25%; the whole process of the invention is carried out online, the process is simple, zero removal of the repair layer on the surface of the crystal roller is realized, the repair efficiency of the surface of the crystal roller is increased by more than 30%, the repair cycle is greatly shortened, and the repair cost is reduced.

Description

technical field [0001] The invention belongs to the fields of mechanical manufacturing and steelmaking and continuous casting, and in particular relates to an online restoration method for conical hole defects on the surface of crystallization rollers, in particular to a method for quickly restoring the conical hole defects formed in the repair layer during the cold spraying repair process of crystallization rollers . Background technique [0002] Cold air power spray repair (referred to as "cold spray repair") copper continuous casting crystallizer or crystal roll technology is a very potential repair technology for workpieces. This technology uses high-pressure gas to carry metal particles through a special Laval nozzle to generate supersonic Gas-solid two-way flow, high-speed flying metal particles hit the surface of the crystallizer or crystallization roll to be repaired in a completely solid state, and the metal particles and the surface material of the substrate underg...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/04B23P6/00
Inventor 梁永立史弼张宇军杨晓萍张俊宝
Owner BAOSHAN IRON & STEEL CO LTD
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