Chip Formation Research Using High Speed Filming, Cutting Force Measurements—A First Approach
摘要
In 2018, 4.8 million m3 of forest material was turned to sawdust in Swedish sawmills. The difference in value-added between sawdust and main products, i.e., planks and boards, is large, while products made from sawn timber generally have a longer lifespan compared to those made from sawdust. This results in carbon storage for a longer period, contributing to climate benefits, while solid wood can be reused, whereas sawdust is usually burned. The largest loss in value-added is generated by the cutting tools that break down the logs, and thinner tools can reduce the amount of short-lived products and allow for a greater proportion of long-lived products. Thinner cutting tools reduce the amount of chips produced but results in a sensitive process that is more easily affected by disturbances, such as those caused by chip formation and handling. To develop technical solutions, a better understanding of what happens in the cutting process and with the chips generated is needed, and therefore, new equipment is required to measure quantities that describe the cutting process and chip formation in the same conditions as in today's sawmill machines. A preliminary study has been conducted where two measurement technologies for short-time events have been examined: High-speed filming technology and cutting force measurements using piezoelectric load cells. Together with computed tomography scanning of the work piece, a laboratory infrastructure is being constructed where we foresee possibilities to increase understanding of chip formation mechanisms, test new tool designs and increase collaboration with sawmills and the wood industry.