Papers by Keyword: Medium Density Fiberboard (MDF)

Abstract: Abstract．Drilling quality in manufacturing medium density fiberboards (MDF) is greatly affected by delamination. In multi-spindle drill machine, the feed is provided by feed pressure generated by air compressor. This study focus on relation between delamination and machining parameters in drilling MDF with variable feed pressure. The relation is investigated by establishing second order polynomial models using response surface methodology, and the analysis of variance (ANOVA) is employed to verify the validity of the models. It is found that the delamination factor increases with the decrease of drill hardness and with the increase of feed pressure both at entry and exit of MDF. However, at low level hardness and high level feed pressure, the delamination factor is insensitive with variation of drill hardness and feed pressure.

Abstract: Medium density fiberboard (MDF) is an engineered wood generally used in wooden industries. Drilling is the most frequently used machining operation in the assembly of furniture working. During drilling cutting forces are developed. These cutting forces are affecting the surface qualities and also causes delamination damage. The cutting conditions and the process parameters play an important role in controlling the cutting forces. The objective of this work is to study the influence of cutting parameters such as spindle speed, feed rate and point angle to reduce the cutting forces developed during drilling. Drilling tests are conducted using Taguchi design of experiments. The mathematical model is developed using response surface methodology (RSM) to evaluate the influence of spindle speed, feed rate and point angle on thrust force. It is seen that high spindle speed with low feed rate combination gives better results in drilling of MDF panels.

Abstract: This paper reports on the development of predicted mathematical model for cutting force (F_c) during side milling of medium density fiberboard (MDF) using uncoated carbide insert. Box-Behnken design (BBD) of experiment, coupled with response surface method (RSM) were employed to establish the cutting force model. Evaluation on the effects and interactions of the machining variables on the cutting force were carried out. The machining variables involved include spindle speed, feed rate, routing width and were denoted by A, B and C respectively. Statistical analysis conducted on the experimental results indicated that the mathematical model for cutting force was adequate within the limits of factors being investigated. After eliminating the insignificant factors or model terms in the reduced model, it was found that factors A, B, C, B² (second order of B), C² (second order of C), were the most significant factors affecting the cutting force. BC (interaction of B and C) and AC (interaction of A and C) are the subsequent significant factors. Three-dimensional plots displaying the interactions between these significant factors were presented. The reduced model was then verified experimentally and statistically using ANOVA. It was evident that Box-Behnken design proved to be an efficient tool in identifying and constructing maps of interactions between the significant factors. Experimental results showed that lower cutting force can be obtained by employing higher cutting speed, low feed rate and lower routing width when side milling MDF using uncoated carbide insert.