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: (724) 772-8512 FAX: (724) 776-0243TO PLACE A DOCUMENT
3、 ORDER; (724) 776-4970 FAX: (724) 776-0790SAE WEB ADDRESS http:/www.sae.orgCopyright 1989 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 Sta
4、ndardJ2025ISSUEDJUN89Issued 1989-06METHOD FOR EVALUATING THE FLOW PROPERTIES OF PUMPABLE SEALERSForewordThis Document has not changed other than to put it into the new SAE Technical Standards BoardFormat.1. ScopeThis SAE Recommended Practice sets forth a method for evaluating the flow properties ofa
5、utomotive sealers that have been dispensed via a high pressure automatic system.1.1 BackgroundFor many years, automotive sealers were applied manually by means of an operator-held flowgun. The operator could adjust flow rates by hand speed and/or adjusting the pump pressures up or down asdesired. To
6、day, however, some sealers are applied by automated means such as robots, gantry tables, etc.To be effective, an automated system must be capable of applying material at a constant known rate. Thisdemands that the equipment and material handling parameters remain constant, not changing from their in
7、itialsetup.2. ReferencesThere are no referenced publications specified herein.3. Principle of MethodsThis method involves dispensing a sealer through a standard production system. Thematerial being tested is subjected to three separate dispensing conditions at a temperature of 18 C (65 F).The three
8、conditions listed below simulate the typical in-plant pumping variations that can cause variability insealer delivery rates:a. Condition #1: The material is pressurized from zero static to 10 350 kPa (1500 psi) dynamic pressurewith the resulting flow rate being measured. This simulates a “start-up“
9、condition.b. Condition #2: The material is pressurized under a static condition of 11 040 kPa (1600 psi) for 1 hfollowed by 1 h of dynamic pressure of 10 350 kPa (1500 psi) during which the material is pumpedcontinuously followed by a flow rate determination. This simulates an accelerated, constanta
10、pplication of material.c. Condition #3: The material is held under a static pressure of 11 040 kPa (1600 psi) for 24 h followedby a dynamic pressure of 10 350 kPa (1500 psi) during which the flow rate is determined. Thissimulates a system being left under pressure, overnight, with a subsequent start
11、 up the next day.SAE J2025 Issued JUN89-2-4. Equipment1 - 55 gallon drum of sealant to be tested.1-Air operated positive displacement pump (42:1 ratio) with an elevator, follower plate, and air pressuregage(s).1 - Dispensing system consisting of: (see Figure 1.)1 - (A) 31.75 mm (1-1/4 in) x 1.83 m (
12、6 ft) hose3 - (B) Visual test gages - 27 600 kPa (4000 psi), 345 kPa (50 psi) divisions1 - (C) 50.8 mm (2 in) x 3.05 m (10 ft) header pipe with 31.75 mm (1-1/4 in) I.D.1 - (D) Limit switch1 - (E) 31.75 mm (1-1/4 in) to 50.8 mm (2 in) reducing bushing1 - (F) 50.8 mm (2 in) pipe elbows2 - (G) Cycle co
13、unters1 - (H) Second timer2 - (I) Solenoid operated three-way air valve 25.4 mm (1 in)1 - (J) 50.8 mm (2 in) to 12.7 mm (1/2 in) reducing bushing1 - (K) 12.7 mm (1/2 in) x 3.05 m (10 ft) hose1 - (L) 25.4 mm (1 in) x 76.2 mm (3 in) pipe1 - (M) Reducing bushing with commercial 4.76 mm (3/16 in) nozzle
14、1 - (N) 25.4 mm (1 in) air actuated ball valve1 - (O) 25.4 mm (1 in) pipe tee1 - (P) Cup actuator1 - (Q) Temperature indicator (digital)1 - (R) 50.8 mm (2 in) pipe tee1 - Weight scale (digital)1 - Air compressor1 - Control panel for automatic actuators1 - Climate control room at 18C (65F)5. Dispensi
15、ng System Assembly (See Figure 1):5.1 Mount limit switch (D) to the pump to indicate complete up-to-down cycles.5.2 Install the gage (B) #1 to the outlet of the pump equipment.5.3 Attach a 31.75 mm (1-1/4 in) x 1.83 m (6 ft) hose (A) to the outlet of the pump.5.4 Attach the other end of the hose (A)
16、 to the inlet end of 50.8 mm (2 in) header (C).5.5 Install the gage (B) #2 to 50.8 mm (2 in) pipe tee (R) on the outlet end of 50.8 mm (2 in) header (C).5.6 Attach a 12.7 mm (1/2 in) x 3.05 m (10 ft) hose (K) to the outlet of 50.8 mm (2 in) pipe tee (R).5.7 Attach a 12.7 mm (1/2 in) x 3.05 m (10 ft)
17、 hose (K) to the inlet of 25.4 mm (1 in) air actuated ball valve (N).5.8 Attach a 25.4 mm (1 in) x 76.2 mm (3 in) pipe (L) to the outlet of a 25.4 mm (1 in) air actuated ball valve (N).5.9 Attach a 25.4 mm (1 in) pipe tee (O) to the outlet end of a 25.4 mm (1 in) x 76.2 mm (3 in) pipe (L).5.10 Insta
18、ll a gage (B) #3 to the outlet end of a 25.4 mm (1 in) pipe tee (O).5.11 Install a 4.76 mm (3/16 in) nozzle (M) to the outlet end of a 25.4 mm (1 in) tee (O).SAE J2025 Issued JUN89-3-FIGURE 1SAE J2025 Issued JUN89-4-5.12 Attach a temperature indicator (Q) to a nozzle (M).5.13 Install and position a
19、cup catch (P).6. Test Procedure #1 - Start-Up Condition6.1 Condition the material, equipment, and room to 18C (65F), or as specified, for approximately 72 h.6.2 Purge the entire system with 5 gallons of test material.6.2.1 While purging the material, adjust the air pressure to achieve a dynamic pres
20、sure at gage (B) #3 of10350kPa (1500 psi).6.2.2 Note what air pressure is required to the air motor on air gage (S).6.3 At this point, relieve all pressure from the system and allow the material to stabilize for approximately 1 h.6.4 Set the air pressure from 6.2.2 on gage (S) required for the 10 35
21、0 kPa (1500 psi) dynamic material pressure.16.5 Set the cycle counter (G) #1 to six complete cycles and counter (G) #2 to three complete cycles.6.6 Press the start button. At this point, the following will occur:6.6.1 The actuators to the air motor and a 25.4 mm (1 in) ball valve (N) will switch to
22、open.6.6.2 The limit switch (D) will count off six complete cycles to counter (G) #1.6.6.3 Counter (G) #2 will start and count off three complete cycles. At the same time, the following will occur:6.6.3.1 The timer (H) will turn on and record the time of the last three complete cycles.6.6.3.2 The cu
23、p catch (P) will be actuated to catch the last three complete cycles.6.6.3.3 After the last three complete cycles, the 25.4 mm (1 in) ball valve (N) will close allowing a static pressure tobuild in the system.NOTEThe air motor will remain on.6.7 Record the pumping information collected during the la
24、st three cycles.6.7.1 Determine the weight of the sealer collected in the cup (P).6.7.2 Record the time in seconds needed to pump the three cycles as shown on the timer (H).6.7.3 Record the temperature at the nozzle as indicated by the thermocouple (Q).6.8 Leave the air motor on for the next procedu
25、re and proceed to 7.1.1. The air motor and material; air actuated ball valve is not actuated until the start button is pushed in. See 6.6.SAE J2025 Issued JUN89-5-7. Test Procedure #2 - Constant Application7.1 Allow the system from 6.8 to remain pressurized in a static condition for 1 h at a pressur
26、e of 10 350 kPa (1500psi) to 11 040 kPa (1600 psi).7.2 Switch off the counters (G) #1 and #2.7.3 Press the start button. At this point, the following will occur:7.3.1 The actuator to the 25.4 mm (1 in) ball valve (N) will switch to open.7.3.2 Dispense the material for 1 h.7.3.3 Toward the end of the
27、 1 h run, note the time it takes for nine complete cycles to allow sufficient time toactivate the counters (G).7.3.4 Activate the counters (G) at the predetermined point near the end of the 1 h pumping cycle.7.3.5 The limit switch (D) will count off six complete cycles to counter (G) #1.7.3.6 The co
28、unter (G) #2 will count off three complete cycles. At the same time, the following will occur:7.3.6.1 Timer (H) will turn on and record the duration of three complete cycles.7.3.6.2 The cup catch (P) will be actuated to catch three complete cycles of material.7.3.6.3 After three complete cycles, the
29、 25.4 mm (1 in) ball valve (N) will close allowing static pressure to build inthe system.NOTEThe air motor will remain on.7.4 Record the pumping information collected during the last three cycles.7.4.1 Determine the weight of the sealer collected in cup (P).7.4.2 Record the time in seconds needed to
30、 pump the three cycles as shown on timer (H).7.4.3 Record the temperature at the nozzle as indicated by thermocouple (Q).7.5 Leave the air motor on for the next procedure and proceed to 8.1.8. Test Procedure #3 - 24 Hours Static Pressure8.1 Allow the system from 7.5 to remain pressurized in a static
31、 condition for 24 h at a pressure of 10 350 kPa (1500psi) to 11 040 kPa (1600 psi).8.2 Press the start button. At this point, the following will occur:8.2.1 The actuator to the 25.4 mm (1 in) ball valve (N) will switch to open.8.2.2 The limit switch (D) will count off six complete cycles to counter
32、(G) #1.SAE J2025 Issued JUN89-6-8.2.3 The counter (G) #2 will start and count off three complete cycles. At the same time, the following will occur:8.2.3.1 The timer (H) will turn on and record the duration of three complete cycles.8.2.3.2 The cup catch (P) will be actuated to catch three complete c
33、ycles of material.8.2.3.3 After three complete cycles, the 25.4 mm (1 in) ball valve (N) will close allowing static pressure to build inthe system. (Note: the air motor will remain on)8.3 At this point, relieve all the pressure from the system and allow to stand.8.4 Record the pumping information co
34、llected during the last three cycles.8.4.1 Determine the weight of the sealer collected in cup (P).8.4.2 Record the time in seconds needed to pump the three cycles as shown on timer (H).8.4.3 Record the temperature at the nozzle as indicated by thermocouple (Q).9. Equipment Clean Up9.1 Disconnect th
35、e 12.7 mm (1/2 in) x 3.05 m (10 ft) hose (K) from the 25.4 mm (1 in) ball valve (N).9.2 Remove the pump assembly from a 55 gallon drum and remove the follower plate.9.3 Using pure mineral spirits, purge out approximately five gallons of tested material.9.4 Position the hose back to the mineral spiri
36、ts container and recycle the mineral spirits through the pump forapproximately 1 h.9.5 Disassemble all the equipment and inspect for any remaining material, hand clean and allow to air dry.10. ReportingAssemble and compare the pumping data for the three conditions simulating the initial start up,con
37、tinuous run, and overnight pressurized shutdown as they relate to the volume pumped per cycle, timerequired to pump a cycle, and the maximum temperature attained.PREPARED BY THE SAE ADHESIVES AND BODY SEALERS COMMITTEESAE J2025 Issued JUN89RationaleNot applicable.Relationship of SAE Standard to ISO
38、StandardNot applicable.ApplicationThis SAE Recommended Practice sets forth a method for evaluating the flow properties ofautomotive sealers that have been dispensed via a high pressure automatic system.Reference SectionThere are no referenced publications specified herein.Developed by the SAE Adhesives and Body Sealers Committee
