Self-centering positioner and principle for locating and guiding deep-hole drills using oil films

Self-centering positioner and principle for locating and guiding deep-hole drills using oil films A novel principle for machining of deep holes is proposed. A self-centering positioner (SCP) was invented, and the principle for locating and guiding deep-hole drills using oil films was studied. The SCP is fixed between the drill tip and the drill shank. Four wedge-shaped zones are formed between the SCP and the wall of the machined hole. The rotating SCP draws cutting oil into the converging, wedge-shaped zones, which produces a pressure in each wedge-shaped oil film. The oil films will support, locate, and guide the SCP along with the drill tip and the shank. The oil films act on the SCP in a manner similar to that by which a four-jaw chuck clamps a workpiece, thereby enhancing the stiffness of the drill system and protecting the drill from deviation. The force exerted on the SCP by each oil film is calculated. Experiments showed that hole straightness was improved when using an SCP. The eccentricity ratio and width of the SCP strongly influence the force exerted on the SCP and straightness of the hole. A deep-hole drill with an SCP follows the axis of the hole during the machining process—in contrast to the current method in which the drill is guided by the wall of the hole. This novel principle applies to both symmetric and asymmetric deep-hole drills. It is derived from dynamic lubrication in bearings and serves as a break from the convention that has guided deep-hole machining for many years. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png The International Journal of Advanced Manufacturing Technology Springer Journals

Self-centering positioner and principle for locating and guiding deep-hole drills using oil films

Loading next page...
 
/lp/springer_journal/self-centering-positioner-and-principle-for-locating-and-guiding-deep-u0QX0ANtG0
Publisher
Springer London
Copyright
Copyright © 2017 by Springer-Verlag London
Subject
Engineering; Industrial and Production Engineering; Media Management; Mechanical Engineering; Computer-Aided Engineering (CAD, CAE) and Design
ISSN
0268-3768
eISSN
1433-3015
D.O.I.
10.1007/s00170-017-0185-5
Publisher site
See Article on Publisher Site

Abstract

A novel principle for machining of deep holes is proposed. A self-centering positioner (SCP) was invented, and the principle for locating and guiding deep-hole drills using oil films was studied. The SCP is fixed between the drill tip and the drill shank. Four wedge-shaped zones are formed between the SCP and the wall of the machined hole. The rotating SCP draws cutting oil into the converging, wedge-shaped zones, which produces a pressure in each wedge-shaped oil film. The oil films will support, locate, and guide the SCP along with the drill tip and the shank. The oil films act on the SCP in a manner similar to that by which a four-jaw chuck clamps a workpiece, thereby enhancing the stiffness of the drill system and protecting the drill from deviation. The force exerted on the SCP by each oil film is calculated. Experiments showed that hole straightness was improved when using an SCP. The eccentricity ratio and width of the SCP strongly influence the force exerted on the SCP and straightness of the hole. A deep-hole drill with an SCP follows the axis of the hole during the machining process—in contrast to the current method in which the drill is guided by the wall of the hole. This novel principle applies to both symmetric and asymmetric deep-hole drills. It is derived from dynamic lubrication in bearings and serves as a break from the convention that has guided deep-hole machining for many years.

Journal

The International Journal of Advanced Manufacturing TechnologySpringer Journals

Published: Mar 2, 2017

References

You’re reading a free preview. Subscribe to read the entire article.


DeepDyve is your
personal research library

It’s your single place to instantly
discover and read the research
that matters to you.

Enjoy affordable access to
over 18 million articles from more than
15,000 peer-reviewed journals.

All for just $49/month

Explore the DeepDyve Library

Search

Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly

Organize

Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.

Access

Get unlimited, online access to over 18 million full-text articles from more than 15,000 scientific journals.

Your journals are on DeepDyve

Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.

All the latest content is available, no embargo periods.

See the journals in your area

DeepDyve

Freelancer

DeepDyve

Pro

Price

FREE

$49/month
$360/year

Save searches from
Google Scholar,
PubMed

Create lists to
organize your research

Export lists, citations

Read DeepDyve articles

Abstract access only

Unlimited access to over
18 million full-text articles

Print

20 pages / month

PDF Discount

20% off