Calendaring roller shell and manufacturing method thereof

Abstract

The invention discloses a calendaring roller shell and a manufacturing method of the calendaring roller shell. The calendaring roller shell is made of forged steel. The manufacturing method of the calendaring roller shell comprises the steps of roller blank preparation, thermal refining, surface quenching treatment, tempering treatment and final machining treatment. A line-frequency induction quenching method is adopted by surface quenching treatment. The quenching temperature is 890 DEG C-910 DEG C, the heating width of a line-frequency induction ring is 80mm-100mm, and the walking speed of the line-frequency induction ring is 0.8mm / s-1.2mm / s. According to the calendaring roller shell, cast iron is replaced by the forged steel and a special surface quenching technology is combined, so that the hardness of the surface of the finally machined calendaring roller shell reaches 82 HSD-88HSD, the uniformity of hardness is equal to or smaller than 3HSD, the depth of a surface quenching layer reaches 15mm-20mm, and the service life reaches over 20 years.

Description

technical field [0001] The invention belongs to the technical field of metallurgical rolls, and in particular relates to a calender roll sleeve and a manufacturing method thereof. Background technique [0002] In the modern paper industry, the calender is an important equipment for the production of high-quality paper. After the paper is calendered, the surface gloss, tightness and thickness uniformity will be greatly improved. The calender roller is the part on the calender that is directly in contact with the paper web, and its surface quality directly determines the final paper surface quality. [0003] There are mainly two types of calender rolls in the prior art, one is a solid calender roll made of a single chilled cast iron material, and the other is a combined calender roll widely used at present, with a roll sleeve and a roll shaft passing through the machine. Assembled in the same way, the roller sleeve adopts a hollow structure to reduce weight. [0004] The fir...

AI Technical Summary

Problems solved by technology

The disadvantages of this calender roller sleeve are: (1) Although the casting defects such as pores and sand holes can be controlled to a certain extent, since it is still made of cast iron through centrifugal casting, casting defects cannot be completely avoided

(2) Although the outer layer of the roll sleeve has high wear resistance, the hardened layer is relatively shallow, the thickness of the effective hardened layer is not enough, and the segregation of the cast structure of the outer layer is difficult to control. When the calender roll needs to be heated during use When the thermal expansion coefficient is not the same, it will cause its deformation, making it difficult to control the thickness of the paper

(3) It is difficult to control the quality of the bonding layer in the dual-material structure. Once there is a problem with the bonding strength and excessive structure of the bonding layer, it will easily lead to failure of the calender roll. The service life of the combined calender roll is usually less than 10 years

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