Repair method of flying shear crankshaft on roll steel production line

Abstract

The invention discloses a repair method of a flying shear crankshaft on a roll steel production line. The repair method includes carrying out static balance weight calculation to a plurality of circular eccentric blocks at two ends of the crankshaft respectively; manufacturing counterweights at two ends of the crankshaft according to results of static balance weight calculation; arranging the crankshaft onto a general machine tool, mounting the counterweights at non-processing bars of two ends of the crankshaft while keeping the counterweights balanced to weighting gravity centers of two ends of the crankshaft, starting the machine tool to cut out the excircle of an intermediate shaft of the crankshaft trially, and finally performing repair operation to the crankshaft when the roundness is smaller than or equal to 0.01mm. In the step of static balance weight calculation, the static balance weights are respectively weight differences of the circular eccentric blocks on and below the axial horizontal plane of the intermediate shaft of the crankshaft, and the weights of the circular eccentric blocks on and below the axial horizontal plane are obtained according to the product of density, area of the circular eccentric blocks on and above the axial horizontal plane and the length of the circular eccentric blocks. By the repair method, the flying shear crankshaft can be repaired conveniently, crankshaft repair cost is reduced, technical requirements for dimension and geometric tolerance of the crankshaft are met, and normal running of flying shears is guaranteed.

Description

technical field [0001] The invention relates to a repair method for a flying shear crankshaft of a steel rolling production line. Background technique [0002] In all kinds of steel rolling production line equipment, there are often crankshaft flying shears in the form of rotary connecting rods. Its function is to cut off the head and tail of the strip entering the rolling mill and the section with bad shape, so that the strip can pass through the rolling mill unit smoothly. And the output roller table is sent to the coiler to prevent the jammed steel, the head and tail of the strip and the section with bad shape from producing roll marks on the surface of the roll during the strip threading process. The flying shear plays a vital role in the entire steel rolling process. effect. [0003] Usually, the flying shear is driven by the crankshaft of the rotary connecting rod to realize the strip blank shearing, such as figure 1 As shown, the rotary connecting rod crankshaft inc...

AI Technical Summary

Problems solved by technology

As a result, the crankshaft had to be repaired by manual grinding. The size and shape tolerance of the manually ground crankshaft could not meet the technical requirements. Therefore, the repaired crankshaft had a very unsatisfactory use effect, which affected the normal operation of the flying shear.

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