Multi-channel laser system with phase locking by holographic gain gratings and small diameter deep hole drilling

2007 ◽  
Author(s):  
Alexander V. Fedin ◽  
Andrey V. Gavrilov ◽  
Sergey N. Smetanin ◽  
Sergey A. Solokhin
Keyword(s):  
Phase Locking ◽  
Laser System ◽  
Small Diameter ◽  
Hole Drilling ◽  
Deep Hole ◽  
Deep Hole Drilling

The Performance of Small Diameter Twist Drills in Deep-Hole Drilling

2006 ◽  
Vol 128 (4) ◽  
pp. 884-892 ◽  
Author(s):  
Robert Heinemann ◽  
Srichand Hinduja ◽  
George Barrow ◽  
Gerhard Petuelli
Keyword(s):  
Tool Life ◽  
High Speed ◽  
Small Diameter ◽  
High Speed Steel ◽  
Minimum Quantity Lubrication ◽  
Hole Drilling ◽  
Deep Hole ◽  
Deep Hole Drilling ◽  
Flute Surface ◽  
Twist Drills

This paper investigates the performance of small diameter high-speed steel twist drills drilling boreholes with a depth of ten times the diameter into carbon steel AISI 1045 using minimum quantity lubrication. The performance of small twist drills is determined, first, by their deep-hole drilling capability, i.e., in how far the cutting forces can be kept at a noncritical level by maintaining the chip disposal, and, second, by their tool life. This work shows that both the deep-hole drilling capability and tool life of small drills are strongly dependent on their geometry, in particular the size of the chip flutes, and the flute surface topography.

Deep-Hole Drilling in Stainless Steel with Small Diameter Twist Drills

2012 ◽  
Vol 433-440 ◽  
pp. 552-557 ◽  
Author(s):  
Gerhard Petuelli ◽  
Christoph Nentwig
Keyword(s):  
Stainless Steel ◽  
Small Diameter ◽  
Hole Drilling ◽  
Tool Geometry ◽  
Twist Drill ◽  
Deep Hole ◽  
Deep Hole Drilling ◽  
The Individual ◽  
The Impact ◽  
Twist Drills

In this paper results of manufacturing tests are described done in order to evaluate the performances of twist drills of diameter d = 1.2 mm and 1.4 mm respectively, if boring into stainless steel X90CrMoV18 (1.4112). Deep-hole drilling was realized thus, that the depth of the bore hole was greater than 10 times the diameter of the twist drill (L/d >10). In order to reduce the impact on the environment caused by the coolant, it was found that minimum quantity lubrication (MQL) can be applied. Hence, the ecology of the mass production of perforated discs for the food processing industry can be improved. The performance of the several small diameter twist drills was determined and evaluated by, firstly, their deep-hole drilling capability, e.g. assessed by the variation or even increase of cutting forces with increasing depth and travel, whether the forces exceed a critical level due to poor chip extraction. In addition, the suitability to use or rather implement the different small diameter twist drills for high-speed cutting (HSC) and finally the individual tool service life for each investigated twist drill. This research project has shown that the accomplishable performance and operating time are strongly dependent on tool cutting material and the tool geometry, especially the size of the chip flutes of a twist drill, as well as the individual coating of the cutting tools.

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