ASTM B362-91(2003)
(Test Method)Standard Test Method for Mechanical Torque Rate of Spiral Coils of Thermostat Metal
Standard Test Method for Mechanical Torque Rate of Spiral Coils of Thermostat Metal
SIGNIFICANCE AND USE
This test method is useful to determine the mechanical force of spiral coils of thermostat metal.
The mechanical properties of a coil may vary from lot to lot of thermostat metal material. This method is useful for determining the optimum thickness and length of the material for a given mechanical torque specification.
This test is useful as a quality test to determine acceptance or rejection of a lot of thermostat metal coils.
SCOPE
1.1 The test method covers the principles of determining the mechanical torque rate of spiral coils of thermostat metal.
Note 1—This test method has been developed particularly to cover the determination of the mechanical torque rate of spiral coils made of thermostat metal for carburetors and manifold heat controls. The method is not limited to thermostat metals and can be used for spiral coils of other materials for which the torque rate must be measured accurately.
1.2 The values stated in inch-pound units are to be regarded as the standard. The metric equivalents of inch-pound units may be approximate.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to become familiar with all hazards including those identified in the appropriate Material Safety Data Sheet for this product/material as provided by the manufacturer, to establish appropriate safety and health practices, and determine the applicability of regulatory limitations prior to use.
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Standards Content (Sample)
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Designation:B362–91(Reapproved2003)
Standard Test Method for
Mechanical Torque Rate of Spiral Coils of Thermostat Metal
This standard is issued under the fixed designation B 362; 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.
1. Scope outer end of the spiral coil be held stationary, but not fixed, and
the inner end of the coil be rotated after applying a load to the
1.1 The test method covers the principles of determining the
outer end of the coil at a fixed radius.
mechanical torque rate of spiral coils of thermostat metal.
NOTE 1—This test method has been developed particularly to cover the 4. Significance and Use
determination of the mechanical torque rate of spiral coils made of
4.1 This test method is useful to determine the mechanical
thermostat metal for carburetors and manifold heat controls. The method
force of spiral coils of thermostat metal.
is not limited to thermostat metals and can be used for spiral coils of other
4.2 The mechanical properties of a coil may vary from lot to
materials for which the torque rate must be measured accurately.
lot of thermostat metal material. This method is useful for
1.2 The values stated in inch-pound units are to be regarded
determining the optimum thickness and length of the material
as the standard. The metric equivalents of inch-pound units
for a given mechanical torque specification.
may be approximate.
4.3 This test is useful as a quality test to determine accep-
1.3 This standard does not purport to address all of the
tance or rejection of a lot of thermostat metal coils.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to become familiar
5. Apparatus
with all hazards including those identified in the appropriate
5.1 The determination of the mechanical torque rate of
Material Safety Data Sheet for this product/material as pro-
spiral coils is subject to many variables and is sensitive to the
vided by the manufacturer, to establish appropriate safety and
degree that even different apparatus employing the same test
health practices, and determine the applicability of regulatory
principles will give different results. Therefore it is recom-
limitations prior to use.
mended that the apparatus be standardized. The apparatus
shown in Fig. 1 and Fig. 2 and consisting essentially of the
2. Terminology
following components, has been found satisfactory:
2.1 thermostat metal—a composite material, usually in the
5.1.1 Specimen Holder—A specimen holder shall provide
form of sheet or strip, comprising two or more materials of any
for securely holding the inner end of the test specimen.
appropriate nature, metallic or otherwise, that, by virtue of the
Preferably, the holder or mounting arbor shall be of circular
differing expansivities of the components, tends to alter its
cross section whose diameter is as large as possible without
curvature when its temperature is changed.
touching the inner turn of the coil under any test conditions of
2.2 mechanical torque rate—the ratio of torque to deflec-
load. The end of the arbor shall be slotted entirely across its
tion. It is a measure of the stiffness of the coil and may have the
diameter, to a depth greater than the width of the specimen, and
units of ounce inch or gram centimetre per angular degree.
of a width slightly narrower than the thickness of the specimen.
2.3 spiral coil—a part made by winding strip on itself.
Thus, the inner tab will be a push or snug fit in the slot for its
entire width. The edges of the slot shall be sharp where it
3. Summary of Test Method
intersects the circumference of the arbor. The slot shall be so
3.1 The test for mechanical torque rate of spiral coils
positioned in the arbor that the center of rotation of the arbor
consists of applying a torque, or moment of force, that will not
and the coil will coincide.
stress the material in excess of its elastic limits, to the coil and
5.1.2 Protractor—The angular deflection due to the test
measuring the resulting deflection as angular rotation. Of the
torque shall be measured by a protractor with a minimum
several methods for obtaining this value, it is preferred that the
division of 0.5 angular degrees.
5.1.3 Loading Pin—The loading pin is the member by
means of which the load is applied to the outer end of the coil.
This test method is under the jurisdiction of ASTM Committee B02 on
Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee The pin shall be preferably of circular cross section approxi-
B02.10 on Thermostat Metals and Electrical Resistance Heating Materials. 3
mately ⁄32 in. (2.4 mm) in diameter. The distance from the
Current edition approved June 10, 2003. Published Ju
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