Sheri Kurgin, Jean M. Dasch, Daniel L. Simon, Gary C. Barber and Qian Zou
The purpose of this paper is to compare the performance of single- and dual-channel minimum quantity lubrication (MQL) for reaming spool bores in an automotive transmission valve…
Abstract
Purpose
The purpose of this paper is to compare the performance of single- and dual-channel minimum quantity lubrication (MQL) for reaming spool bores in an automotive transmission valve body.
Design/methodology/approach
Machining experiments are conducted under various parameters for both single- and dual-channel MQL. Comparison metrics include part surface temperature, spindle power consumption and hole quality. Experimental data from traditional through-tool flood coolant are provided as a baseline for spindle power consumption and part quality.
Findings
The results show that with proper tooling and machining parameters, dual-channel MQL can perform equivalently or better than flood coolant. Single-channel MQL was not deemed suitable for this machining application.
Practical implications
The results of the study show that MQL can be successfully applied for precision reaming of aluminum and can provide guidance in developing an MQL system.
Originality/value
Few studies have been performed for reaming holes in general, and very few studies have been performed for reaming with MQL. Reaming is a critical operation used to create holes with precise quality. No study was found in the literature review that directly compared the performance of single- and dual-channel MQL delivery systems.
Details
Keywords
Sheri Kurgin, Jean M. Dasch, Daniel L. Simon, Gary C. Barber and Qian Zou
The purpose of this paper is to evaluate the cooling ability of minimum quantity lubrication (MQL) cutting fluid.
Abstract
Purpose
The purpose of this paper is to evaluate the cooling ability of minimum quantity lubrication (MQL) cutting fluid.
Design/methodology/approach
An experimental system is devised to find the heat transfer coefficient of MQL under simulated reaming conditions. Cooling rate of the specimen is measured with an infrared camera. The effect of air pressure and oil volume on cooling rate is tested. Metal cutting tests are performed to evaluate the effect of heat transfer coefficient on workpiece temperature.
Findings
Convective heat transfer coefficient for MQL increases with increasing air pressure. Oil volume has an indeterminate effect on the heat transfer coefficient; however, it is a dominant factor for controlling temperature during reaming.
Practical implications
The results of the study can provide guidance to optimize the temperature controlling ability of MQL for production.
Originality/value
There is limited information available in literature regarding the heat transfer coefficient of metal working fluids, particularly for MQL. In particular, experiments designed to investigate the effect of air pressure and oil volume on the heat transfer coefficient of the mist have not been previously documented. This information may be used to improve the overall cooling ability of MQL mist, thus increasing its effectiveness at controlling tool wear and maintaining part quality. The other major contribution of this work is to separate the role of the cooling and lubrication for controlling temperature while reaming aluminum. Prior to this study, there has been relatively little research performed for the reaming metal cutting operation, and still less for reaming with MQL. The nature of how metal working fluids control temperature is not fully understood, and this work provides insight as to whether cooling or lubrication plays the dominant role for reaming.
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Fangwei Xie and Youfu Hou
The purpose of this paper is to reveal the characteristics of hydrodynamic load capacity and torque transferred by oil film with variable viscosity, and the effect of groove…
Abstract
Purpose
The purpose of this paper is to reveal the characteristics of hydrodynamic load capacity and torque transferred by oil film with variable viscosity, and the effect of groove number, width and depth on the hydrodynamic load capacity and torque transfer.
Design/methodology/approach
The radial temperature of friction pair and viscosity of YLA‐N32 hydraulic oil were measured through experiments, and a viscosity‐diameter expression was deduced using polynomial fitting method. Analytical expressions for hydrodynamic load capacity and torque of the oil film were deduced based on hydrodynamic lubrication theory.
Findings
The investigation shows the hydrodynamic load capacity and transferred torque with variable viscosity are much less than that with constant viscosity. Load capacity increases with the increase of groove depth which is the most significant influence factor, while it has the least influence on torque. Groove width has great influence on load capacity and torque. The load capacity increases with the increase of groove width; contrarily, torque decreases with the increase of groove width. Groove number has little influence on load capacity, while it has great influence on torque. The torque decreases with the increase of groove number.
Originality/value
In this paper, analytical solutions for hydrodynamic load capacity and torque of the oil film with variable viscosity are deduced. The paper reveals the relationship between hydrodynamic load capacity, torque transfer and groove number, width and depth.
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Joseph Calvin Gagnon and Brian R. Barber
Alternative education settings (AES; i.e., self-contained alternative schools, therapeutic day treatment and residential schools, and juvenile corrections schools) serve youth…
Abstract
Alternative education settings (AES; i.e., self-contained alternative schools, therapeutic day treatment and residential schools, and juvenile corrections schools) serve youth with complicated and often serious academic and behavioral needs. The use of evidence-based practices (EBPs) and practices with Best Available Evidence are necessary to increase the likelihood of long-term success for these youth. In this chapter, we define three primary categories of AES and review what we know about the characteristics of youth in these schools. Next, we discuss the current emphasis on identifying and implementing EBPs with regard to both academic interventions (i.e., reading and mathematics) and interventions addressing student behavior. In particular, we consider implementation in AES, where there are often high percentages of youth requiring special education services and who have a significant need for EBPs to succeed academically, behaviorally, and in their transition to adulthood. We focus our discussion on: (a) examining approaches to identifying EBPs; (b) providing a brief review of EBPs and Best Available Evidence in the areas of mathematics, reading, and interventions addressing student behavior for youth in AES; (c) delineating key implementation challenges in AES; and (d) providing recommendations for how to facilitate the use of EBPs in AES.
Gary D. Barber and Carol Burroughs
Judging from the titles in this year's survey, 1982/83 was the “Year of the Bibliography.” Wherein half of last year's reviews were bibliographies, almost three‐fourths of this…
Abstract
Judging from the titles in this year's survey, 1982/83 was the “Year of the Bibliography.” Wherein half of last year's reviews were bibliographies, almost three‐fourths of this year's are (11 out of 15): much of this can be attributed to the computer. The outstanding (and anachronistic) exception to this general truth is Beers' Bibliography, which was compiled laboriously by hand.
Gary D. Barber and Carol Burroughs
This seventh annual survey of American history reference sources is the largest yet; 23 books have been selected for review, while past surveys averaged about 15 titles. The…
Abstract
This seventh annual survey of American history reference sources is the largest yet; 23 books have been selected for review, while past surveys averaged about 15 titles. The reviews include 14 titles published in 1983, eight published early in 1984, and one 1982 title. The 1982 imprint, Proceedings and Debates of the British Parliaments Respecting North America, was overlooked before. Since it is still in progress it is included in this survey.
This year's survey focuses on reference works published in 1980. The two exceptions, reviewed in Part Two, were deemed too important to omit (Women's History Sources; A Guide to…
Abstract
This year's survey focuses on reference works published in 1980. The two exceptions, reviewed in Part Two, were deemed too important to omit (Women's History Sources; A Guide to Archives and Manuscript Collections in the United States, and Index to the Papers of the Continental Congress, 1774–1789, which supplements the Index to the Journals of the Continental Congress). Among the 1980 imprints are a fairly even mix of bibliographies, indexes, biographical compilations and encyclopedic dictionaries. The Harvard Encyclopedia of American Ethnic Groups is an especially outstanding work published in 1980.
Gary D. Barber and Carol Burroughs
While few college students are majoring in history today, perhaps the field is not as close to extinction as some people fear. Professional historians continue to delve into…
Abstract
While few college students are majoring in history today, perhaps the field is not as close to extinction as some people fear. Professional historians continue to delve into various historical nooks and crannies and are busy planning future endeavors. A collection of articles in two 1981 issues of the Journal of Interdisciplinary History explores a variety of recent historiographical developments. These state‐of‐the‐art essays cover economic, intellectual and population history, the history of science, political history, family history, biography, and quantification. They are must reading for anyone interested in knowing where historical studies are headed during the remaining two decades of the 20th century.
This index accompanies the index that appeared in Reference Services Review 16:4 (1988). As noted in the introduction to that index, the articles in RSR that deal with specific…
Abstract
This index accompanies the index that appeared in Reference Services Review 16:4 (1988). As noted in the introduction to that index, the articles in RSR that deal with specific reference titles can be grouped into two categories: those that review specific titles (to a maximum of three) and those that review titles pertinent to a specific subject or discipline. The index in RSR 16:4 covered the first category; it indexed, by title, all titles that had been reviewed in the “Reference Serials” and the “Landmarks of Reference” columns, as well as selected titles from the “Indexes and Indexers,” “Government Publications,” and “Special Feature” columns of the journal.
The purpose of this article is to present an overview of the history and development of transaction log analysis (TLA) in library and information science research. Organizing a…
Abstract
The purpose of this article is to present an overview of the history and development of transaction log analysis (TLA) in library and information science research. Organizing a literature review of the first twenty‐five years of TLA poses some challenges and requires some decisions. The primary organizing principle could be a strict chronology of the published research, the research questions addressed, the automated information retrieval (IR) systems that generated the data, the results gained, or even the researchers themselves. The group of active transaction log analyzers remains fairly small in number, and researchers who use transaction logs tend to use this method more than once, so tracing the development and refinement of individuals' uses of the methodology could provide insight into the progress of the method as a whole. For example, if we examine how researchers like W. David Penniman, John Tolle, Christine Borgman, Ray Larson, and Micheline Hancock‐Beaulieu have modified their own understandings and applications of the method over time, we may get an accurate sense of the development of all applications.