ASTM D() – 橡胶/塑料/铁件 磨损率试验标准. ASTM D(). Standard Test Method for Wear Rate and Coefficient of Friction of Materials in Self-Lubricated Rubbing Contact Using. ASTM D(04) – Download as PDF File .pdf), Text File .txt) or read online.
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Each test consists of break-in for 40 h followed by a selected test duration, each at the same selected normal load and speed.
NOTE 2—Petroleum distillates, formerly used as solvents, have been eliminated due to possible toxic effects. Originally approved in Falex Friction and Wear test machine.
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This test data would be used for the design of gears and bushings. Mark the test specimen inside the raised d702 surface so subsequent measurements can be made at the same places.
Coefficient of Friction ASTM D3702
PV limit pressure x velocity is the point at which the material fails catastrophically. Typical wear rates for some commonly used materials at different PV levels are: Assurance Testing Inspection Certification. Acetal homopolymer at PV1: Auditing Consulting Sourcing Training. A break-in period, typically 40 hours, is run to ensure intimate contact between the mating parts.
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NOTE 3—Remove all solvents from the washer before testing. NOTE 4—Check compatibility of the test specimen cleaning procedure and reagents with the speci?
It is the product of a restraining force and the radius at which it acts to balance the frictional torque. Typical spindle speed range is 10 to rpm. Torque the bolt to 6. Users of this standard are expressly advised that determination of d370 validity of any such patent adtm, and the risk of infringement of such rights, are entirely their own responsibility.
Wear rate can be calculated as either in. A built-in tachometer provides speed indication. Test durations will often be in the 50 to h range. No further reproductions authorized.
Coefficient of Friction ASTM D
Subscripts 2a, 2b, 2c, and 2d are the corresponding? Last previous edition approved in as D—94 Polyamide Type at PV2: Test materials are machined into a disk approximately 1. Precision and Bias Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.
Wear in h round robins averaged 0. An elapsed time indicator with reset feature to indicate motor running time should x3702 included. Summary of Test Method 3. Validating the specifications, value and safety of your raw materials, products and assets.
It is recommended that clean cotton gloves or clean tweezers or tongs be used. Permission rights to photocopy the standard may also be secured from the ASTM website www. The test sample is then weighed and measured, and the test begins.
This manufacturer recommends a maximum test load of lb kg. Need help or have a question? NOTE 5—Calibrate torque meter such that the anticipated test torque is approximately two-thirds of calibration value. Load is obtained by application of dead weights to the Inspection Validating the specifications, value and safety of your raw materials, products and assets.
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The contact area is 1. Reagents and Materials 6. The specimen is fixed into the sample holder using a pin and a bolt, and this assembly is inserted into the tester. A number in parentheses indicates the year of last reapproval. It is generally believed that useful wear rate precision 1. Send us a request Wilton UK: The mean rubbing velocity is related to spindle rotational speed: