Sugar mill millroller shaft neck wear repairing method

Abstract

The invention discloses a sugar mill millroller shaft neck wear repairing method which includes the following steps that 1, whether a millroller shaft neck is worn or not is detected; 2, if the millroller shaft neck is worn, silica sand spraying preprocessing is conducted on the worn portion of the millroller shaft neck; 3, the worn portion of the millroller shaft neck is sprayed to conduct bottoming ranging from 0.2 mm to 0.5 mm in depth through electric arc spraying equipment by means of nickel aluminum alloy wires; 4, the worn portion generated after bottoming is conducted is sprayed to conduct transition ranging from 1mm to 5 mm in depth through the electric arc spraying equipment and by means of low-carbon martensite stainless steel wires; 5, the worn portion generated after the transition is conducted is spayed to conduct thickening by 1-2 mm through the electric arc spraying equipment by means of high-carbon martensite stainless steel wires; 6, turning is conducted on the worn portion processed in step 5 to reach the required size. According to the method, the worn portion is repaired through the electric arc spraying equipment, the temperature of the electric arc spraying equipment is 50 DEG C, material embrittlement and thermal stress caused by high temperature are avoided, and the problem that the worn portion is large in stress and prone to be peeled off is avoided.

Description

technical field [0001] The invention relates to the field of metal surface engineering, in particular to a method for repairing the journal wear of a press roller of a sugar press. Background technique [0002] The wear of the roller journal of the sugar press has the following characteristics: 1) Large size, 200-450mm in diameter, 3-15 tons in weight; 2) Severe wear, 1-10mm in wear; 3) Maintenance every 6 months once. Existing repair techniques for shaft parts include arc welding, gas shielded welding, submerged arc welding, thermal spraying, laser welding, and brush plating. [0003] The temperature of arc welding is as high as 1500 degrees, and the molten pool is deep inside the shaft, so that the material of the shaft changes from a forged state to a cast state, which is easy to be brittle. It produces slag inclusions and causes defects, so it is rarely used at present. [0004] Compared with arc welding, gas shielded welding has been improved, the molten pool is rela...

AI Technical Summary

Problems solved by technology

Gas-shielded welding once became the main method of repair, but gas-shielded welding inevitably produces pores, that is, defects, which cause the parts to stop running

[0005] Compared with the former two, submerged arc welding solves the problems of slag inclusion and pores, but it cannot solve the problems of material brittleness and thermal stress. It is only suitable for shafts with a diameter of more than 500mm, because the shaft with a large diameter has sufficient strength to compensate Effects of Material Brittleness

[0006] The existing thermal spraying technology can only repair the thickness of 1mm of wear, too thick and excessive stress will cause shedding, and it is only suitable for the repair of small parts (diameter less than 200mm)

[0007] Laser welding technology is an emerging high-tech technology, high cost, slow efficiency, not suitable for maintenance of large parts

[0008] The brush plating technology can only repair the thickness below 0.5mm, and the efficiency is low, so it is not suitable for the maintenance of the parts

[0009] For a long time, there has been a lack of an effective method that can restore the size and improve wear resistance without affecting the material and strength of the parts.

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