The quality of MDF workpieces machined in CNC milling machine in cutting speeds, feedrate, and depth of cut

Abstract

Medium density fiberboard (MDF) is an industrial product created from lignocellulosic fibers and resin through the combined action of pressure and heat. Have homogeneity, dimensional stability and mechanical strength similar to solid wood. Milling is a machining method widely used within furniture industries; and despite the noteworthy relevance of the subject, there are few specific works dealing with the MDF milling process using computerized numerical control machines. It is increasingly necessary a programmed machining able to generate suitable surface to coatings, allowing for minimum waste and maximum efficiency, besides the decrease of the tool wear. The irregular surface after machining reduces the quality of the final product; this characteristic is defined by measuring the roughness of MDF panel workpieces. Thus, it is possible to quantify the surface quality and improve the machining process with cutting speed, feed rate, depth cut among others. It was observed that roughness exhibited lower values in higher cutting speeds and low feed rates. The 1 mm depth of cut showed optimized surface results. It was concluded that the parameters studied here significantly influence the finishing, resulting in irregular surfaces that can reduce the quality of products.

The effects of step over, feed rate and finish depth on the surface roughness of fiberboard processed with CNC machine

“…As the density of the fibres board increases, the surface roughness values of fiberboard processed with CNC machines decreases. Similar results were reported by Lou et al, (1998), Sütçü and Karagöz (2012) and Deus et al, (2015). Three-Way ANOVA test results were given in Table 1.…”

Investigation of the Effect of Machining Parameters on Surface Quality in Bamboo

“…A remarkable stabilization was observed for depth of cuts at values 1 mm and 1.5 mm. It is obtained that at higher cutting speeds, the Ra values decrease [26].…”

“…When the effect of cutter feed rate on Ra is examined, a significant increase in Ra value was seen by increasing feed rate from 1000 mm/min to 1500 mm/min., and Ra value increased by increasing feed rate to 2000 mm/min, which is the maximum speed of CNC machine, but this increase was slightly lower.Similar results were reported in other studies. An increase in spindle speed and feed rate resulted in a decrease in surface roughness [10,21,22,[26][27][28][29]. The surface roughness of MDF increased with lower spindle speed, lower stepover, lower feed rate and lower depth of cut [14].…”

Methodology of Temperature Monitoring in the Process of CNC Machining of Solid Wood

“…Some of them dealt with the issue experimentally, others analytically or numerically e.g., [21][22][23][24][25][26]. They found out that the tool temperature is affected by various parameters "of the cutting process" including the tool material, tool quality, tool wear, type of milling cutter used, thickness of the removed layer, feed rate, cutting speed, direction of milling [27][28][29], wedge angle and sharpening angle [30]. Tool temperature is affected, besides other things, by the material machined and its anatomical properties (e.g., wood species, grain direction, wood defects), physical properties (moisture content-in some cases the temperature increases with the increase in moisture content, in other cases it decreases, density) and mechanical properties (strength, hardness etc.)…”