Abstract
Raw pine wood processing and especially its mechanical processing constitute a significant share among technological operations leading to obtaining a finished product. Stable implementation of machining operations, ensuring long-term repeatable processing results depends on many factors, such as quality and invariability of raw material, technical condition of technological equipment, adopted parameters of work, qualifications and experience of operators, as well as preparation and properties of the machining tools used. It seems that the greatest potential in the search for opportunities to increase the efficiency of machining operations has the modification of machining tools used in it. This paper presents the results of research work aimed at determining how the life of cutting tools used in planing operations of wet pine wood is affected by the application of chromium aluminum nitride (AlCrN) coating to planar industrial planing knives in the process of physical vapour deposition. For this purpose operational tests were carried out under production conditions in a medium-sized wood processing company. The study compares the effective working time, rounding radius, the profile along the knife (size of worn edge displacement, wear area of the cutting edge), selected texture parameters of the planar industrial planing knife rake face and visual analyses of cutting edge condition of AlCrN-coated planar knives and unmodified ones. The obtained experimental results showed the possibility of increasing the life of AlCrN-coated knives up to 154% compared to the results obtained with uncoated ones. The proposed modification of the operational features of the knives does not involve any changes in the technological process of planing, does not require any interference with the machining station nor its parameters, therefore enabling rapid and easy implementation into industrial practice.
Highlights
An important part of the economy of many European countries is the wood processing industry (Walker et al 2013; Schmithüsen et al 2015), processing raw material from deciduous and coniferous trees
This paper presents the results of research work aimed at determining how the life of cutting tools used in planing operations of wet pine wood is affected by the application of chromium aluminium nitride (AlCrN) coating to knives in the process of physical vapour deposition (PVD)
Taking into account all the above factors, the obtained results of the planar industrial planing knives life tests in the planing process of wet Scots pine (Pinus sylvestris L.) should be assessed as very beneficial from the point of view of carried out machining operation in the wood processing industry
Summary
An important part of the economy of many European countries is the wood processing industry (Walker et al 2013; Schmithüsen et al 2015), processing raw material from deciduous and coniferous trees. An important softwood obtained from coniferous trees showing high industrial significance is Scots pine (Pinus sylvestris L.) This species (Farjon 2005; Marinich and Powell 2017), occurring mainly in the northern hemisphere, is relatively harvested and uncomplicated in processing, whereby the best technical properties are characterized by pine wood from felled trees aged 80–120 years. Due to the “natural” character of pine wood raw material, some of its features are difficult to predict They can be, for example, heterogeneity of wood, occurrence of knots, twisted fibers, cracks, irregular structure of growth rings (Sandberg and Söderström 2006; Berthier et al 2001; Axelsson 2012a, b, Altgen et al 2017). It seems that the greatest potential in the search for opportunities to increase the efficiency of machining operations has the modification of the machining tools used
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