電腦數控花鉋機銑削加工之刀尖磨耗

Bit Edge Wearing in Wood Up-Millingwith CNC Router

王怡仁(Yiren Wang) ； 蘇文清(Wen-Ching Su)

《林產工業》 18卷1期 (1999/03) Pp. 87-96

https://doi.org/10.6561/FPI.1999.18(1).9

摘要

本研究主要在探討電腦數控花鉋機之木材切削加工中，不同切削材長下之刀尖磨耗情形。試驗用切削刀具為鉋花直刀，切削直徑12mm，2刃刀片，刀刃材質為高碳鋼，刀具幾何為刀端角500，斜度角及間隙角各為20°。供切削之材料有中密度纖維板（MDF）及楓木（Maple）。銳削方式以上向循邊切削為主。文中探討切制材長為10m、20m、40m、80m、160m、320m、6 40m、1 2 80m、2560m及5120m時之刀尖磨耗，方法為將經過不同切削材長的刀具埋蠟、切片，再將刀真剖面轉為影像圖檔，然後利用電腦輔助繪圖軟體，將影像圖檔讀取並量取磨耗斜度面、間隙面的後退量及刀具半徑，以為磨耗指標。試驗結果得知二種材料之刀尖磨耗剖面，在切削材長2560m以下時近似，然切削材長達5120m以上時，切削楓木之刀具會產生月牙窪剖面。此外，MDF加工面粗糙度因其厚度方向比重的不均勻，而顯示較楓木粗糙的加工面，但二者加工面粗糙度並未隨切削材長之增加而有明顯的變化。

關鍵字

電腦數控花鉋機 ； 銑削 ； 鉋花直刀 ； 刀尖磨耗 ； 粗糙度

並列摘要

This study was to explore the edge wear of router-bits at various feeding length by CNC router. The shank diameter of the two-blade router-bit was 12 mm which was made of high carbon steel with a sharpness angle of 50 degree with the rake angle and clearance angle were 20 degree respectively. Material used for cutting were maple and MDF of similar specific gravity. The wearing of the router-bit was measured at feeding lengths of 10, 20, 40, 80, 160, 320, 640, 1280, 2560 and 5120 meters. After each stage, the router-bit was embedded in a commercial molding polymer to obtain the profile of the router-bit. The polymer mold was then sliced by a microtome. The sliced profile was observed under a microscope equipped with a Charge Coupled Devices (CCD) camera to record the profile image file. The image file was then processed by AutoCAD software to measure the rake recession, clearance recession and radius of the tip as the indicators of the wearing degree of the routerbit. The results showed that the edge recession of the router -bit of the two materials were quite similar to each other at a feeding length of 2560 meters. However, the router-bit profile for maple showed a concaved image at the feeding length of 5120 meters. Furthermore, surface roughness of both materials did not increase with increasing feeding length although the cut surface of MDF was always rougher than that of maple due to uneven distribution of the specific gravity across the thickness of MDF.

並列關鍵字

CNCrouter ； milling ； router-bit ； edge-wear ； roughness