1、FORD WORLDWIDE FASTENER STANDARDDate: 1996-10-01Engineering Standards & 1 of 3 Printed copies are uncontrolled .Systems Engineering (ESSE)WM 961Performance Testing for the Retaining Features on Plastic Fasteners1. SCOPE. This standard covers the test methods for establishing the performance of panel
2、 retainingfeatures for various fasteners.Fir Tree/Bayonet and other push-in types.“T“ Weld Stud type.Weld Stud typePanel Edge type.The standard also covers the test methods for establishing the performance of pipe retaining features forvarious plastic pipe clips.Latch typePush-in type2. APPLICATION.
3、 This standard will normally be applied to plastic fasteners with a feature designed toretain the part in a panel hole, on welded “T“ stud attached to a panel, on a welded stud attached to apanel, or on the edge of a panel in a specially designed hole. It may also be applied to plastic plugs ortrim
4、retaining buttons.The standard can also be applied to plastic pipe clips such as latch and push-in (this includes spacer andswivel) type features.3. PERFORMANCE TEST METHODS.3.1 PANEL RETAINING FEATURE.3.1.1 FIR TREE/BAYONET AND OTHER PUSH-IN TYPE FEATURES.Figure 1 - Typical Fir Tree, Bayonet and Ot
5、her Push-in Type FeaturesThe feature shall be pushed into a hole in a steel test plate and the force measured. Thefeature shall then be pulled out of the test plate and the force measured.The diameter of the hole in the test plate, the thickness of the test plate, the maximum push-in force and the m
6、inimum pull-out force shall be as specified on the Ford drawingfor the part.FORD WORLDWIDE FASTENER STANDARDDate: 1996-10-01Engineering Standards & 2 of 3 Printed copies are uncontrolled .Systems Engineering (ESSE)WM 961Performance Testing for the Retaining Features on Plastic Fasteners3.1.2 “T“ Wel
7、d Stud Type FeatureFigure 2 - Typical “T“ Weld StudThe feature shall be pushed on to a steel “T“ welded stud in direction F 1 which meets thedimensional requirements of Ford part number W700569 and the force measured. Thefeature shall then be pulled off the “T“ welded stud in direction F 2 and the f
8、orce measured.The maximum push-on and the minimum pull-off forces shall be as specified on the Forddrawing for the part.Figure 3 - Typical Weld Stud3.1.3 Special Thread Weld Stud Type FeatureThe retaining feature molded into plastic parts to be used on special thread weld studs isoptional provided w
9、hen tested on a stud with the dimensional requirements of W700121(pushed-on and pulled-off) the maximum push-on force and the minimum pull-off forcesare specified on the Ford drawing.3.1.4 Panel Edge Type FeatureFigure 4 - Typical Panel Edge FeatureThe feature shall be pushed on to a steel test plat
10、e until securely fitted in the retaininghole and the force measured. The feature shall then be pulled off the test plate and theforce measured. The hole in the test plate, the thickness of the test plate, the maximumpush-on force and the minimum pull-off force shall be as specified on the Ford drawi
11、ngfor the part.FORD WORLDWIDE FASTENER STANDARDDate: 1996-10-01Engineering Standards & 3 of 3 Printed copies are uncontrolled .Systems Engineering (ESSE)WM 961Performance Testing for the Retaining Features on Plastic Fasteners3.2 Pipe Retaining Features3.2.1 Latch Type FeaturesFigure 5 - Typical Lat
12、ch FeatureThe Latch feature shall be closed securely so as to retain appropriate steel test mandrelsand the force (push-on) measured. Forces shall be applied to the assembly such that thelatch feature is loaded until failure occurs (latch pulls apart). The minimum force to causefailure shall be reco
13、rded.The test mandrels diameters shall have a tolerance of +/-0.1 and the assembly conditionsof the mandrels shall be as stated on the Ford drawing for the part.The maximum push-on force and the minimum pull-apart force for the feature shall be asspecified on the Ford drawing.3.2.2 Push In Type Feat
14、uresFigure 6 - Typical Push-In FeatureThe mandrels shall be pushed into the feature in the directions shown on the Forddrawing for the part and the forces recorded. The mandrels shall then be pulled out in theopposite direction and forces recorded.The test mandrels diameters shall have a tolerance o
15、f +/-0.1 and the assembly conditionsof the mandrels shall be as stated on the Ford drawing for the part.The maximum push-in force and the minimum pull-out force shall be as specified on theFord drawing for the part.4. GENERALAll testing shall be carried out at ambient temperature (23 c +/-2).The speed of testing shall be 100mm +/-5 per minute.NOTE : This does not apply to the testing of the latch type features.
