A Novel Approach to the Design of Self-Piloting Drills With External Chip Removal, Part 2: Bottom Clearance Topology and Experimental Results

Author:

Astakhov V. P.1,Galitsky V. V.2,Osman M. O. M.3

Affiliation:

1. Dept. of Mechanical Engineering, Concordia University, Montreal, Quebec, Canada, H3G 1M8

2. Dept. of Tool Manufacturing, Kiev Polytechnic Institute, Kiev, Ukraine 252056

3. Dept. of Mechanical Engineering, Concordia University, Montreal, Canada H3G 1M8

Abstract

In the first part of this paper, geometrical relations were formulated to describe the geometry of a self-piloting drill with external chip removal. A novel approach to the design of the cutting tip was proposed and an experimental comparison between conventional and newly designed drills was made. In deep hole drilling, after the tool and the machine, the most important component is the coolant. It is important that the coolant be distributed uniformly within the machining zone to improve chip removal, lubrication and cooling. Thus, in this paper, the coolant flow in the limited space between the drill flanks and the bottom of the hole being drilled (called “bottom clearance”) is emphasized. Experimental investigations were done by using a specially designed workpiece which enables continuous monitoring of coolant flow and pressure distribution in the machining zone. The investigation shows that the newly designed drill is characterized by a significantly better coolant distribution in the bottom clearance resulting in an increase in tool life and better chip removal conditions.

Publisher

ASME International

Subject

General Medicine

Reference12 articles.

1. Astakhov, V. P., 1984, “Fundamental Evaluations of Machine Tool Cooling Systems for Deep-Hole Drilling,” (in Russian), Metallorezushie Stanky, Kiev, No. 12, pp. 63–66.

2. Astakhov, V. P., 1989, “The Cutting Fluid-Chip Transportation in Closed Passages of Deep-Hole Machines,” (in Russian), Metallorezushie stanky, Kiev, No. 17, pp. 93–97.

3. Astakhov, V. P., and Galitsky, V. V., 1986, “A Method of Investigation of Coolant Flow Rate Distribution at Machining Zone under Deep Hole Drilling,” (in Russian), USSR patent No. 1256888, GKNT.

4. Astakhov V. P. , and GalitskyV. V., and OsmanM. O. M., 1993, “A Novel Approach to the Design of Self-Piloting Drills with External Chip Removal, Part 1: Geometry of the Cutting Tip and Grinding Process,” ASME JOURNAL OF ENGINEERING FOR INDUSTRY, Vol. 117, No. 4, pp. 453–463.

5. Astakhov, V. P., Galitsky, V. V., Shlafman, N. L., and Galitsky, A. V., 1987, “A Method of Investigation into Flow of Coolant in Drill and Measurement Setup” (in Russian), USSR patent No. 1459819, GKNT.

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