ASTM E618-81(2001)
(Test Method)Standard Method for Evaluating Machining Performance of Ferrous Metals Using an Automatic Screw/Bar Machine
Standard Method for Evaluating Machining Performance of Ferrous Metals Using an Automatic Screw/Bar Machine
SCOPE
1.1 This method covers a production-type test for evaluating the machining performance of ferrous metals as they are used in single-spindle or multiple-spindle automatic screw machines. It is based on producing parts of a standard design in such machines to uniform levels of quality with respect to surface roughness and size variation. The standard test piece, designed for this test, is machined from bars using a specified number of tools in a specified sequence. Nothing in this method should be construed as defining or establishing limits of acceptability for any grade or type of metal.
1.2 This standard may involve hazardous materials, operations, and equipment. This standard does not purport to address all of the safety problems associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Designation:E 618–81(Reapproved2001)
Standard Test Method for
Evaluating Machining Performance of Ferrous Metals Using
1
an Automatic Screw/Bar Machine
This standard is issued under the fixed designation E 618; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
INTRODUCTION
This test method was written to fill a requirement for a standard test for determining the
machinability of ferrous metals using automatic screw/bar machines. (Hereafter, these machines will
be referred to as automatic screw machines.) Although a variety of short-time laboratory tests have
demonstrated different machining characteristics among ferrous metals, it has been difficult to apply
the resulting data to commercial automatic screw machine practice.
In this test method a standard test piece is machined using tools and machining operations typical
of automatic screw machine practice.
Through the use of this test method, the relative machining performance of a metal can be evaluated
even though different automatic screw machines are used. Further, comparisons can be made among
different lots of the same grade or different grades to determine relative machining performance.
1. Scope 3. Terminology
1.1 This test method covers a production-type test for 3.1 Definitions of Terms Specific to This Standard:
evaluating the machining performance of ferrous metals as 3.1.1 average surface roughness (per set of samples)—for
they are used in single-spindle or multiple-spindle automatic each surface (the major and minor diameter formed surfaces)
screw machines. It is based on producing parts of a standard the surface roughness per set of samples is the average of the
design in such machines to uniform levels of quality with roughnesses recorded as in 3.1.5.1 for the six test pieces per
respect to surface roughness and size variation. The standard set. A test set is described in 9.3.
test piece, designed for this test, is machined from bars using 3.1.2 calculated hourly production rate (in pieces per
a specified number of tools in a specified sequence. Nothing in hour)—3600 s/h divided by the cycle time in seconds per
this test method should be construed as defining or establishing piece. (Unit: pieces per hour.)
limits of acceptability for any grade or type of metal. 3.1.3 cycle time—the time in seconds per piece from bar
1.2 This standard does not purport to address all of the feed-out to bar feed-out, or from cutoff to cutoff, during
safety concerns, if any, associated with its use. It is the uninterrupted operation of the machine. It includes all stock,
responsibility of the user of this standard to establish appro- machine, and tool movements.
priate safety and health practices and determine the applica- 3.1.4 surface speed—the product of the original bar circum-
bility of regulatory limitations prior to use. ference (in feet or metres) and the spindle speed in revolutions
per minute. (Unit: ft/min or m/min.)
2. Referenced Documents
3.1.5 surface-roughness average value (R )—the surface-
a
2.1 American National Standard:
roughness average value is the mean reading around which the
2
B46.1 Surface Texture needle tends to dwell or fluctuate under small amplitude when
a continuously averaging meter is used. (Refer to 3.8.1.1 in
ANSI B46.1). The surface-roughness value obtained by a
1 continuously averaging digital readout meter is acceptable.
This test method is under the jurisdiction of ASTM Committee A01 on Steel,
3.1.5.1 The surface-roughness recorded for each surface on
Stainless Steel, and RelatedAlloys and is the direct responsibility of Subcommittee
A1.15 on Bars.
thetestpieceisthemaximumofthesurface-roughnessaverage
Current edition approved March 27, 1981. Published July 1981. Originally
values measured on that surface at a minimum of four places
published as E 618 – 77 T. Last previous edition E 618 – 77 T.
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equispaced around the circumference and measured as de-
Available from American National Standards Institutes, 25 W. 43rd Street, 4th
Floor, New York, NY 10036. scribed in 3.1.5.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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E 618–81 (2001)
3.1.6 surface-roughness range (per set of samples)—the test pieces in a sample set consistently exceed either the
lowest and highest values of the surface roughnesses recorded surface-roughness limits or the size limits specified in 9.7.1,
for each surface as in 3.1.5.1 for each set. 9.7.2, and 9.7.3 for the piece diameter produced by that tool.
3.1.7 surface-roughnes
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