1、 ENGINEERING MATERIAL SPECIFICATIONDate Action Revisions 2003 09 30 Revised Para 3.0 inserted; para 3.5, 3.6 and 4 deleted 1994 03 31 NGA1E10370437003 Released -A8 A.Vallabhanath 1964 01 30 F6-1217 Released Printed copies are uncontrolled Copyright 2003, Ford Global Technologies, Inc. Page 1 of 4 CO
2、PPER GRAPHITE ELECTRIC MOTOR BRUSH MATERIAL ESF-M6A69-A (25-190 micro ohms.cm RESISTIVITY) COPPER GRAPHITE ELECTRIC MOTOR BRUSH MATERIAL ESF-M6A69-A2 (170-350 micro ohms.cm RESISTIVITY) COPPER GRAPHITE ELECTRIC MOTOR BRUSH MATERIAL ESF-M6A69-A3 (100-500 micro ohms.cm RESISTIVITY) COPPER GRAPHITE ELE
3、CTRIC MOTOR BRUSH MATERIAL ESF-M6A69-A4 (250-2500 micro ohms.cm RESISTIVITY) COPPER GRAPHITE ELECTRIC MOTOR BRUSH MATERIAL WSF-M6A69-A5 (25-150 micro ohms.cm RESISTIVITY) COPPER GRAPHITE ELECTRIC MOTOR BRUSH MATERIAL ESF-M6A69-A6 (50-190 micro ohms.cm RESISTIVITY) COPPER GRAPHITE ELECTRIC MOTOR BRUS
4、H MATERIAL WSF-M6A69-A7 (13-110 micro ohms.cm RESISTIVITY) COPPER GRAPHITE ELECTRIC MOTOR BRUSH MATERIAL WSF-M6A69-A8 (8-35 micro ohms.cm) 1. SCOPE The materials defined by these specifications are copper graphite for electric motor brushes. 2. APPLICATION These specifications were released original
5、ly for material used as the commutator brush for the heater motors, starter motors etc. 3. REQUIREMENTS 3.0 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Material suppliers and part producers must conform to the Companys Standard Requirements For Production Materials (WSS-M99P1111-A). 3.1 RESISTIVI
6、TY ESF-M6A69-A 25 - 190 micro ohms.cm ESF-M6A69-A2 170 - 350 micro ohms.cm ESF-M6A69-A3 100 - 500 micro ohms.cm ESF-M6A69-A4 250 - 2500 micro ohms.cm WSF-M6A69-A5 25 - 150 micro ohms.cm ESF-M6A69-A6 50 - 190 micro ohms.cm WSF-M6A69-A7 13 - 110 micro ohms.cm WSF-M6A69-A8 8 - 35 micro ohms.cm ENGINEER
7、ING MATERIAL SPECIFICATIONESF-M6A69-A/A2/A3/A4/A6WSF-M6A69-A5/A7/A8Printed copies are uncontrolled Copyright 2003, Ford Global Technologies, Inc. Page 2 of 4 Test Method: The apparatus consists of 2 jaws which can be closed firmly against the ends of the test specimen. The jaws should be faced with
8、silver-plated copper gauze, backed with resilient pads to insure uniform current distribution into the ends of the piece. The size of the test specimen is immaterial, providing it fulfills the following requirement for accurate results. The length should be at least 4 times the width and thickness d
9、imensions and the spacing between pointers should be no more than 1/2 the length of the specimen. For a test specimen the resistivity is defined as follows: r = (E x A x 1000)/(I x L) where: r = resistivity in micro ohms.cm E = millivolt drop between pointers A = cross-sectional area, cm2I = current
10、 in amperes L = pointer spacing, cm The convenient method for obtaining readings of resistivity that are a multiplier of the potential drop in millivolts is to proceed as follows: Test Method: Use a voltmeter (or millivoltmeter) with pointers that are accurately spaced 2 cm apart. Set the current at
11、 1.97 times the value of the cross-sectional area of the specimen in square centimeters: r micro ohms.cm = (E x A x 1000)/(I x L) then r = (E x A x 1000)/(1.97 A x 2) then r = 254E If the specimen is not long enough to use a 2 cm spacing between pointers, another method is to make the pointer spacin
12、g equal to the width of the specimen, and the current setting 3.94 times the thickness, then: r micro ohms.cm = (E x A x 1000)/(I x L) then r = (E x W x T x 1000)/(3.94T x W) then r = 254E ENGINEERING MATERIAL SPECIFICATIONESF-M6A69-A/A2/A3/A4/A6WSF-M6A69-A5/A7/A8Printed copies are uncontrolled Copy
13、right 2003, Ford Global Technologies, Inc. Page 3 of 4 3.2 SCLEROSCOPE HARDNESS ESF-M6A69-A 8 - 24 ESF-M6A69-A2 5 - 20 ESF-M6A69-A3 10 - 30 ESF-M6A69-A4 15 - 30 WSF-M6A69-A5 15 - 30 ESF-M6A69-A6 18 - 34 WSF-M6A69-A7 5 - 25 WSF-M6A69-A8 10 - 30 Test Method: Use a Shore Scleroscope instrument with a d
14、iamond-pointed steel hammer standardized for carbon. Mount and level the instrument on a firm support. The anvil of the instrument must be kept clean at all times. The material is placed on the anvil, and the tube is lowered firmly against the test piece. At least 6 readings (in different areas) sho
15、uld be taken on each specimen to obtain average hardness. 3.3 APPARENT DENSITY ESF-M6A69-A 2.45 - 3.00 g/cm3ESF-M6A69-A2 2.40 - 2.80 g/cm3ESF-M6A69-A3 2.30 - 2.90 g/cm3ESF-M6A69-A4 2.25 - 2.85 g/cm3WSF-M6A69-A5 3.55 - 3.65 g/cm3ESF-M6A69-A6 2.35 - 2.50 g/cm3WSF-M6A69-A7 3.85 - 4.60 g/cm3WSF-M6A69-A8
16、 3.65 - 4.50 g/cm3Test Method: The apparent density is the density of the mass, including the voids or pores, and is expressed in the following manner: Apparent Density = (Weight in Air) divided by the (weight in air minus the Weight in water). The specimen to be tested must first be coated with a t
17、hin coating of grease to prevent water absorption. The piece is then weighed in air and the value recorded. It is then weighed while completely submerged in water, with special care being taken to eliminate all air bubbles from the specimen. Alternate Method: Finish the specimen to such a shape that
18、 the volume can be accurately measured. Then, if the specimen is weighed (g) and such weight divided by the volume (cm3), the result is numerically equal to the apparent density by the formula: Apparent Density = Weight, (g) divided by Volume, (cm3) 3.4 TRANSVERSE STRENGTH, min ESF-M6A69-A/A2 6.6 MP
19、a ESF-M6A69-A3 10.3 MPa ESF-M6A69-A4 9.6 MPa WSF-M6A69-A5 20.7 MPa ESF-M6A69-A6 16.0 MPa WSF-M6A69-A7 10.3 MPa WSF-M6A69-A8 16.5 MPa The transverse strength refers to the strength of the material when tested as a simple beam under load. ENGINEERING MATERIAL SPECIFICATIONESF-M6A69-A/A2/A3/A4/A6WSF-M6
20、A69-A5/A7/A8Printed copies are uncontrolled Copyright 2003, Ford Global Technologies, Inc. Page 4 of 4 Test Method: The specimen is supported at each end by a 1.6 mm radius knife-edge. A load is gradually applied at a point exactly midway between the supports through a third 1.6 mm radius knife-edge
21、 until rupture occurs. Calculate the transverse strength as follows: S = (3 x L x P)/(2 x h2 x b) where: S = maximum stress, MPa L = length between supports, mm h = thickness of specimen, mm h2 = h x h b = width of specimen, mm P = load at instant rupture occurs, N by using a length between supports
22、 of 20 mm and a test specimen 5 mm thick by 6 mm wide and long enough to overlap supports, the formula reduces to: S = (3 x 20 x P)/(2 x 5 x 5 x 6) then S = 60P / 300 or 0.2P 5. GENERAL INFORMATION The information given below is provided for clarification and assistance in meeting the requirements of these specifications. 5.1 CHEMICAL COMPOSITION (Nominal) A A2 A7 Copper 40% 34% 64% Graphite 60 % 63% 29% Others 3% 3% 7%
