PENENTUAN PENUMPULAN PISAU PADA PERMUKAAN KAYU

Jamal Balfas

Abstract


The wear of wood cutting tools is, generally, the process which makes a usable tool unfit for continued use. The replacement of the worn cutter either by reconditioning or substitution of a new one represents a necessary cost which can be minimized by controlling tool wear. Numerous studies have been conducted through direct observations on the cutting edge using a variety of photographic methods. Such observations are quite complicated and can hardly be introduced to industrial practices. This study is aimed to explore a possibility of determining cutting tool wear indirectly through the work piece observation. It is based on assumption that knife blunting has a direct bearing on the quality of the finished product, i.e., changing the geometry of cutting marks on the wood surface.

Boards of two wood species, rasamala and mangium, were seasoned to air-dry condition and planed using new sharp knives at one feed speed of 30 m/min. Observations were carried out sequentially at 5 planing distances, i.e., 10, 20, 40, 80 and 160 m. Cutting marks geometry on the wood surface was distinguished by rubbing the surface gently with a carbon paper. Measurements of cutting marks and the width of cutting peak were undertaken using a digital calliper. Results showed that values of cutting marks and width of cutting peaks markedly increased with increasing planing distances. Blunting process was significantly affected by wood species. Knives used for planing rasamala boards blunted quicker than those used for mangium. These, to some extend, revealed a possible use of cutting marks structure on wood surface for determining the wear of cutting edge.


Keywords


Penumpulan: pisau; permukaan kayu

References


ASTM. 1974. Standard method of conducting machining tests of wood dan wood-base materials. Annual book of ASTM, Philadelphia.

Chardine, A., and J. Froidure. 1969. Study of the wear of saw teeth. Vol I : Influence of wood moisture content and length of cut. Centre Technical Forest Tropical. Nogentsur Marne.

Edamatsu, N., and Y. Ohira. 1957. The effect of tooth angle on blunting of saw teeth. J. Japan wood Res. Soc. 3 : 67-70.

Klamecki, B.E. 1979. A review of wood cutting tool wear literature. Holz als Roh-und Werkstoff 37 :

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Neusser, H., and W. Schall. 1970. Use of ultrasonic vibration in turning wood. Wood Sci. 5 : 211- 222.

Prusak, J, 1957. Hard-chromium plating of wood working toois. Drer Vyskum 2 : 235-249.




DOI: https://doi.org/10.20886/jphh.1994.12.2.109-113

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