Influence of Material of Small Radius Ball End Mill on Cutting Accuracy in Deep Precision Machining

Abstract:

Machining of complex shape and deep micro cavity in die and mold is mostly carried out by electrical discharge machining process. However, it may not be able to sufficiently meet delivery deadline minimization and cost reduction of die and mold. Therefore, precision machining method using small radius ball end mill capable of machining deep cavities in miniature die and mold is proposed as a substitute for electrical discharge machining. This report presents such a result supported by experiment in which it has been proved that long tool life of ball end mill can be maintained by changing coating material and edge profile of small radius ball end mill experiencing form accuracy and get needed surface finish in workpiece. Therefore, for precision machining of die and mold as substitute for electrical discharge machining, it is proposed to perform deep precision machining using small radius ball end mill. This paper shows effect proved by experiment how cutting characteristics which occur by changing of coating material and edge profile of small radius ball end mill influence form accuracy and finishing surface of workpiece.

• Periodical: Key Engineering Materials (Volumes 291-292)
• Pages: 471-474
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.291-292.471
• Online since: August 2005
• Authors: Takeshi Akamatsu, Koichi Kitajima, S. Minamino, T. Kiriyama
• Keywords: Coating Material, Rate of Real Depth of Cut, Small Radius Ball End Mill, Surface Roughness (SR)

References

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[3] 5 0 50 100 150 200 250 300 350 400 450 Cutting distance mSurface roughness µmRz Normal type Pencil type (EPDBP edge) Pencil type 80 85 90 95 100 0 50 100 150 200 250 300 350 400 450 Cutting distance mRate of real depth of cut % Normal type Pencil type (EPDBP edge) Pencil type.

DOI: 10.21236/ad0106290

5mm (a) Normal edge (b) EPDBP edge.

5mm Fig. 6 Relationship between cutting distance and surface roughness Fig. 7 Relationship between cutting distance and rate of real depth of cut There are many vibration marks. There are no vibration marks. Fig. 8 Processed surface on workpiece.