Enhanced Reconditioning of Heavy-Duty Pulp Industry Equipment: Advantages of Abrasive Waterjet Cutting

Enhanced Reconditioning of Heavy-Duty Pulp Industry Equipment: Advantages of Abrasive Waterjet Cutting

Armando Lopes Ramalho (Polytechnic Institute of Castelo Branco, Portugal), Agostinho da Silva (Instituto Politécnico de Leiria, Portugal), Marcelo Calvete Gaspar (Instituto Politécnico de Leiria, Portugal), Carlos Capela (Instituto Politécnico de Leiria, Portugal), Luis Celorrio-Barragué (Universidad de La Rioja, Spain) and Dan Ovidiu Glăvan (University Aurel Vlaicu Arad, Romania)
DOI: 10.4018/978-1-7998-3628-5.ch015
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Abstract

Within a pulp industry production process, a drop in the performance of a wood log rotary debarker was identified. Such loss of performance was due to the occurrence of excessive wear of the device's cutting blades, requiring their regular and premature replacement. The material used to manufacture the cutting blades, Hardox 500, has characteristics considered adequate for the required use. However, it was concluded that the blade manufacturing process degraded its mechanical properties, leading to its premature wear when placed in service. The present study intends to propose, characterize, and validate an alternative cutting process to manufacture the debarker's cutting blades. Abrasive waterjet cutting technology was proposed to produce the cutting blades. The suitability of this manufacturing process is discussed considering the specified geometry and the material characteristics of the resulting cutting blades.
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Introduction And Framework

The use of the waterjet as a cutting technology is an emerging industrial process that, for some industrial applications, has significative advantages over alternative cutting technologies. From the technological point of view, the waterjet cutting technology is carried out in two stages: (i) pressurization of pure water to several hundred MPa, thus generating potential energy and (ii) conduction of this water to a diamond nozzle, through which, within a 100% efficiency process, this potential energy is transformed into kinetic energy, resulting in a jet of water at a flow of twice the speed of sound.

To better understand the characteristics, advantages and possible limitations of the industrial use of waterjet, a brief review on waterjet cutting technology will be present, mainly to consider such manufacturing technology to replace high energy thermal cutting processes. With such technology, it is expected to gain a significant improvement in the final manufactured cutting blade characteristics, which are required for current case-study.

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