Crystallization roller surface taper hole defect online recovery method

A technology of tapered holes and crystallization rollers, which is applied to the online restoration of tapered hole defects on the surface of crystallization rollers, and the field of rapid restoration of tapered hole defects formed in the repair layer during the cold spraying repair process of crystallization rollers, which can solve the initiation of tapered hole defects , Repair coating failure, bridging, disappearance and other problems, to achieve the effect of shortening the repair period, reducing the repair cost and improving the repair efficiency

Active Publication Date: 2014-12-03
BAOSHAN IRON & STEEL CO LTD
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  • 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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  • Crystallization roller surface taper hole defect online recovery method
  • Crystallization roller surface taper hole defect online recovery method
  • Crystallization roller surface taper hole defect online recovery method

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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

A crystallization roller surface taper hole defect online recovery method comprises the following steps: processing a crystallization roller surface taper hole defect inner wall to form a cylindrical flat-bottom hole inner wall, and processing the inner wall to have equidistantly distributed wave texture structures; carrying out smoothing and frosting treatment on the wave texture structure by using a high pressure gas and ceramic particles; and bumping the bottom and the inner wall of the cylindrical flat-bottom holes by using metal particles having a same recovery layer with the surface of the above crystallization roller in order to realize online rapid recovery. The whole recovery process basically has no thermal influences on the crystallization roller, and the microstructure of a taper hole defect recovery area is consistent to that of the crystallization roller surface recovery layer, so the generation of extra stress is effectively avoided, the bonding strength of the taper hole defect recovery area and the crystallization roller surface recovery layer is improved by above 30%, and the thermal fatigue strength is improved by above 25%; and the method has the advantages of online implementation in the whole process, simple technology, realization of the zero removal of the crystallization roller surface recovery layer, increase of the crystallization roller surface recovery rate by above 30%, great shortening of the recovery cycle, and recovery cost reduction.

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 Applications(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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