Cold-welding restoring method for tooth surface notches of presser iron-casting press roll shell

Abstract

The invention discloses a cold-welding restoring method for tooth surface notches of a presser iron-casting press roll shell. The press roll shell comprises a plurality of teeth, at least one tooth has at least one notch, and each of other teeth at least has two notches. The cold-welding restoring method includes for any one notch, dividing the notch into n sections continuously distributed along the length direction of the notch according to the length of the notch; for any two notches, welding the notches in turn, selecting a section on the first notch for welding, quickly hammering a welding seam of the section after welding of the section, and selecting the next section on the first notch for welding when the welding seam of the first notch is cooled to below 60 DEG C. Local overheating of welding-up areas at notches is avoided, welding stress is reduced, cracks are avoided, restored notch positions have good extension strength and rigidity, and working efficiency is guaranteed.

Description

technical field [0001] The invention relates to a cold welding repair technology, in particular to a cold welding repair method for tooth surface chipping of a cast iron press roller of a pressing machine. Background technique [0002] In the production process of the sugar factory during the crushing season, due to the unavoidable inclusion of hard objects such as stones and metals in the cane material, the tooth surface of the cast iron press roller of the press machine will be cracked, resulting in a large amount of slag leakage during the process of pressing sugarcane and pressing efficiency. Reduce, and even make the pressing roller scrapped ahead of time, increasing the production cost. [0003] Cast iron has a high carbon content (the carbon content is greater than 2%), and generally contains silicon, manganese and sulfur and phosphorus impurities, and sometimes different alloying elements are added to obtain cast iron with different properties. The most commonly use...

AI Technical Summary

Problems solved by technology

Although the cast iron electrode can be of the same quality as the base metal, its cooling rate is very sensitive, the cooling rate is fast (cold welding), and the white structure is easy to appear, making it difficult to cut; at the same time, due to the shrinkage of the white structure (1.6 ~2.3%) is larger than the shrinkage of the base metal (0.9~1.3%), so there is a large shear stress between the white tissue and the non-white tissue, and it is easy to produce longitudinal cracks in the fusion zone

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