Abstract
Abrasive belt sanding plays an important role in wood processing. The abrasive grits on the belt perform similar to small cutting tools with negative rake angles. In this study, a series of single-grit scratching tests were carried out on Sugar maple workpieces to investigate the cutting characteristics of two different abrasive-grit shapes. The spherical cone grits had two kinds of included angles, and the triangular pyramid grits provided two cutting forms: one main cutting edge and two side cutting edges as well as two main cutting edges. Both scratching along and across the wood grain direction were conducted. In all cases, the material deformation and surface creation were analyzed, as well as cutting force. Several physical cutting models were established to help further understand the cutting mechanism. A new method was proposed to evaluate the energy consumption of single-grit scratching. The results showed that triangular pyramid grits with sharp cutting edges could sever wood fibers more efficiently, while spherical cone grits are prone to make material plastic deformation mainly manifested as superficial densification and pile-up. When scratching along the wood grain, the triangular pyramid grit with two main cutting edges showed the best cutting performance with better surface quality. It was also shown that the cutting force ratio of spherical cone grits was apparently less than that of triangular pyramid grits. The overall cutting power for spherical cone grits was remarkably higher than that for triangular pyramid grits for both scratching along and across the wood grain, which indicates that triangular pyramid grits have higher cutting efficiency and power utilization.
Highlights
Sanding is a commonly used method in wood machining, which mainly aims to remove a certain quantity of material and acquire a better surface quality prior to gluing and painting [1,2].Abrasive grits on the sanding belt work as small cutting tools with low or even negative rake angles, which induce high normal forces on the wood surface [3]
The results present how the grit geometry affect material deformation and the corresponding energy utilization, which can provide an insight to develop a new type of abrasive tool used in wood sanding with better cutting efficiency and surface quality
One of the goals of this study is to figure out the material deformation and removal process for cutting tools with varied geometries
Summary
Sanding is a commonly used method in wood machining, which mainly aims to remove a certain quantity of material and acquire a better surface quality prior to gluing and painting [1,2]. Abrasive grits on the sanding belt work as small cutting tools with low or even negative rake angles, which induce high normal forces on the wood surface [3]. The literature of wood sanding is mainly about sanding forces, surface roughness, and the influence of surface quality on coating performance. There are a few published works dedicated to material removal and cutting efficiency in wood sanding. Based on the grit-workpiece interaction, Hahn [4] divided the material deformation into three phases which are rubbing, ploughing, and cutting.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
