1、SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirelyvoluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefro
2、m, is the sole responsibility of the user.”SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions.QUESTIONS REGARDING THIS DOCUMENT: (412) 772-8512 FAX: (412) 776-0243TO PLACE A DOCUMENT
3、 ORDER; (412) 776-4970 FAX: (412) 776-0790Copyright 1996 Society of Automotive Engineers, Inc.All rights reserved. Printed in U.S.A.SURFACEVEHICLE400 Commonwealth Drive, Warrendale, PA 15096-0001RECOMMENDEDPRACTICESubmitted for recognition as an American National StandardJ1864REAF.MAR96Issued 1987-0
4、4Reaffirmed 1996-03Superseding J1864 NOV93METHOD FOR EVALUATING MATERIAL SEPARATION IN AUTOMOTIVE SEALERS UNDERPRESSURE IN STATIC CONDITIONSForewordThis reaffirmed document has been changed only to reflect the new SAE Technical Standards Boardformat.1. ScopeThis SAE Recommended Practice sets forth a
5、 method for measuring pressure-induced separation inautomotive sealers and determining the likelihood of equipment failure due to this separation, also known as“caking.“1.1 BackgroundSealers in automotive plants are generally transported and applied via airless pumpingequipment whose internal pressu
6、res may exceed 20.7 MPa (3000 psi). Some sealers have a tendency toseparate when exposed to pressures of this magnitude which results in varying degrees of system blockage.This pressure-induced “caking,“ or blockage of the pump and transport lines, reduces sealer delivery rates andcan completely shu
7、t down the system.Separation tests run on sealers at 20.7 MPa (3000 psi), 25 C (77 F) for 72 h with measured separationvolumes of over 6 mL have been known to cause “caking“ problems in production pumping equipmentwhereas sealers with measured separation volumes of 3 mL or less have not caused this
8、type of problem.2. ReferencesThere are no referenced publications specified herein.3. Principle of MethodsThis document involves injecting automotive sealant into a pressure cup assemblyequipped with a moveable piston cap (see Figure 1). The sealant is then subjected to a static pressure byapplying
9、a force to the pressure cup assembly via the piston cap. This force is supplied by means of amultipower air cylinder for a specified time, after which the pressure is removed, the cylinder is disassembled,and any separated material present is then measured.COPYRIGHT Society of Automotive Engineers,
10、Inc.Licensed by Information Handling ServicesSAE J1864 Reaffirmed MAR96-2-FIGURE 1PISTON CAPCOPYRIGHT Society of Automotive Engineers, Inc.Licensed by Information Handling ServicesSAE J1864 Reaffirmed MAR96-3-4. Equipmenta. Johnstone Sep-Check part no. 110-085-1 or equivalent (see Figure 2)b. Sealer
11、 to be tested; two 350 mL (12 oz) tubes, air freec. 50 mL graduated cylinderd. 25 mL graduated cylindere. Spatulaf. Cleaner (recommended by sealant manufacturer)g. Air compressorCOPYRIGHT Society of Automotive Engineers, Inc.Licensed by Information Handling ServicesSAE J1864 Reaffirmed MAR96FIGURE 2
12、TEST SET-UP5. Pressure Cup Assembly1See Figure 3.1. Test cylinder shall be 44.45 mm (1.75 in) ID x 76.2 mm (3.0 in) in length with equidistant 0.0254 mm (0.001 in) gap between the cylinder wall and piston edge.COPYRIGHT Society of Automotive Engineers, Inc.Licensed by Information Handling ServicesSA
13、E J1864 Reaffirmed MAR96-5-FIGURE 3PRESSURE CUP ASSEMBLY5.1 To assemble pressure cup (see Figure 4), attach three socket screws to piston retainer (see Figure 5) cap andtighten.COPYRIGHT Society of Automotive Engineers, Inc.Licensed by Information Handling ServicesSAE J1864 Reaffirmed MAR96-6-FIGURE
14、 4PRESSURE CUPCOPYRIGHT Society of Automotive Engineers, Inc.Licensed by Information Handling ServicesSAE J1864 Reaffirmed MAR96-7-FIGURE 5PISTON RETAINER CAPCOPYRIGHT Society of Automotive Engineers, Inc.Licensed by Information Handling ServicesSAE J1864 Reaffirmed MAR96-8-5.2 Carefully insert pist
15、on through bottom of pressure cup so no damage is done to “O“ ring.5.3 Attach three socket screws to pressure cup bottom cap (see Figure 6) and tighten carefully so no damage isdone to “O“ ring; make sure bottom cap is flush with bottom of pressure cup.FIGURE 6PRESSURE CUP BOTTOM CAPCOPYRIGHT Societ
16、y of Automotive Engineers, Inc.Licensed by Information Handling ServicesSAE J1864 Reaffirmed MAR96-9-5.4 Attach gauge and bleeder valve to pressure cup.5.5 Ready to load with material.6. Pressure Cup Material Loading6.1 Acquire two 350 mL (12 oz) tubes of air-free sealant.6.2 Open bleeder valve on p
17、ressure cup container.6.3 Push the piston cap to the bottom of the pressure cup.6.4 Remove 6.35 mm (1/4 in) pipe plug. Insert sample tube to the inlet at the bottom cap of the pressure cup.6.5 Fill the pressure chamber until the material bleeds out of the bleeder valve; then close.6.6 Continue to fi
18、ll until the piston cap reaches the top of the pressure cup.6.7 Remove the sample tube and plug the 6.35 mm (1/4 in) inlet.6.8 Reopen the bleeder valve to allow the excess pressure to escape; then close.7. Testing Parameters2See Figure 2.7.1 Set the multipower cylinder predetermined air pressure to
19、equal a 20.7 MPa (3000 psi) load to the pressurecup, or as specified.7.2 Insert the pressure cup into the slot of the base stand.7.3 Position the four-way hand valve in down mode. (At this point, air cylinder must remain on.)7.4 72 h under these conditions are required, or as specified.7.5 After 72
20、h period, position four-way hand valve to up, and remove pressure cap.7.6 Remove bottom cap and push piston cap out until separated material is showing, if any exists. The separatedmaterial is the heavier deposit near the piston cap.7.7 Carefully remove the heavier material from the piston. (Use a s
21、patula.)7.8 Determine in milliliters the volume of separated material using a graduated flask partially filled with water. Inputthe sectioned separated material and note the volume of displaced water.8. Pressure Cup Disassembly and Cleaning8.1 After a test is completed, clean all parts with recommen
22、ded cleaner.8.2 Inspect all “O“ rings for wear and cuts. Replace all damaged “O“ rings.8.3 Reassemble pressure cup for next test.2. Any equipment capable of maintaining a constant load of at least 20.7 MPa (3000 psi) on the pressure cup may be used.COPYRIGHT Society of Automotive Engineers, Inc.Lice
23、nsed by Information Handling ServicesSAE J1864 Reaffirmed MAR96-10-9. ReportRecord the total volume of separated material, operating load, length of time load was applied, andambient temperature during the test.PREPARED BY THE SAE BODY SEALERS SUBCOMMITTEE OF THE SAE MATERIALS JOINING EXECUTIVE COMM
24、.COPYRIGHT Society of Automotive Engineers, Inc.Licensed by Information Handling ServicesSAE J1864 Reaffirmed MAR96RationaleNot applicable.Relationship of SAE Standard to ISO StandardNot applicable.ApplicationThis SAE Recommended Practice sets forth a method for measuring pressure-inducedseparation
25、in automotive sealers and determining the likelihood of equipment failure due to thisseparation, also known as “caking.“Reference SectionThere are no referenced publications specified herein.Developed by the SAE Body Sealers SubcommitteeSponsored by the SAE Materials Joining Executive CommitteeCOPYRIGHT Society of Automotive Engineers, Inc.Licensed by Information Handling Services
