鈑金噴塑工藝規(guī)范（Sheet metal spraying process specification）

1、鈑金噴塑工藝規(guī)范（Sheet metal spraying process specification）Spray operation processI. PendantIn the first 1. processing cabinet display pre degreasing, degreasing and phosphating temperature, coating line display cabinet to dehydration drying and curing of bakingAfter the temperature, the operation begins.2

2、. check the hanger structure is good, the conductive parts in contact with the workpiece is good, even bad contact and replace the damaged hanger.3., check the workpiece for bumps, scratches and rust, the qualified workpiece into the upper part of the area.4. use the cloth to clean the welding slag

3、and dirt at the bottom of the cabinet, so as to prevent the sundries from being brought into the next process.5., the workpiece should be done to protect the studs or parts with stud protection or adhesive tape paper protection. The outer shell of the cabinet shall be loaded with shims and protected

4、 by loadingSet.6. according to the different workpiece to be hung on choosing the right hook hanger hanger; the conveyor chain, confirm the good suspension.7., the workpiece should be correctly carried workpiece, pay attention to safety, ensure that the workpiece hanging position is correct and hang

5、ing reliable, to ensure the normal operation of the conveyor chainStationary.8. pendants can not overlap, two lifting distance is not less than 300mm, the distance between the workpiece is not less than 50mm.Two. Pretreatment1., spray painting is the product after inspection qualified, semi-finished

6、 products surface coverage, rust, corrosion protection, beautiful and beautiful, and hasFunction of sign. Prior to painting and spraying, pretreatment must be carried out, and necessary overall inspection shall be made before processingTrim.Fig. 2. flow chart of pretreatment process1) degreasing - 2

7、) degreasing - 3) first wash - 4) second times water washing - 5) table adjustment - 6) phosphating - 7)Third times washing - 8) fourth times washing - 9) pure water washing3. pretreatment process and parametersorderNumberProcess name, process method, treatment, liquid treatmenttime(SEC)Handletemper

8、atureCInterval lengthBefore LiLiquid zoneTotal leachate area after treatment1 pre degreasing spray degreasing agent 60 50-6020004000170077002 degreasing spray degreasing agent 60 50-608004000170065003 first wash spray industrial water 30 RT 8001500170040004, second washing spray industrial water 30

9、RT 8001500360059005 table adjustment spray table 40-45 RT 36001500170068006 phosphating spray phosphating agent 60-180 35-458004500170070007, third washing spray industrial water 30 RT 8001500110034008, fourth washing spray industrial water 30 RT 7001500110033009 pure wash spray deionized water 30 R

10、T 700150020004200Total 48800Supplementary notesPre degreasing:Tank volume: 3.5 cubic meters temperature: 50-60 DEG C time: no less than 60 seconds pressure: 0.1-0.2PaMixing tank: add water to the working surface of 3/4. After heating to the working temperature, open the spray system. After adding ch

11、emicals, add water toWorking surface. Added per ton: 20KG, Parco, cleaner, 1523R, degreasing agent, 2 KG, Parco, cleaner, 1523Sactive agentControl point: free base: 7-15, ML, total base / free base: less than 2.5, pre - degreasing, every additional point should be added: ParcoCleaner, 1523R, 3.5kg,

12、Parco, cleaner, 1523S, 0.7kgDischarge cycle: full load running for 8 weeks.Degrease:Tank volume: 3.5 cubic meters temperature: 50-60 DEG C time: no less than 60 seconds pressure: 0.1-0.2PaMixing tank: add water to the working surface of 3/4. After heating to the working temperature, open the spray s

13、ystem. After adding chemicals, add water toWorking surface. Added per ton: 20KG, Parco, cleaner, 1523R, degreasing agent, 2 KG, Parco, cleaner, 1523Sactive agentControl point: free base: 7-15, ML, total base / free base: less than 2.5, pre degreasing, every additional FC-4328A, degreasing agent 4.5K

14、g, free alkalinity increased by 1 points, adjusted to the work index, you can heat upDischarge cycle: full load running for 8 weeks.First washTank volume: 1.5 cubic meters, temperature: room temperature: not less than 30 seconds, pressure: 0.4Pa, bath liquid: tap waterControl point: pH value less th

15、an 9Discharge cycle: 1 weeksSecond washTank volume: 1.5 cubic meters, temperature: room temperature: not less than 30 seconds, pressure: 0.4Pa, bath liquid: tap waterControl point: pH value less than 9Discharge cycle: 1 weeksTable adjustment:Tank volume: 1.5 cubic meters, temperature: room temperatu

16、re: not less than 45 seconds, pressure: 1.0PaWater quality control: pH value 7.5-9.5Mixing tank: adjust 1 kg table with deionized water and mix, add water of 3/4 in the tank, turn on spraying system. Mix the mixtureAdd the tank slowly and add water to the working surface.Emission cycle: 8-10 hoursPh

17、osphatingVolume of tank: 3.5 cubic meters, temperature: 40-45 DEG C, time: 1-3 minutes, pressure: 1.0Pa, total acid: 20-36 (ML),Free acid: 0.6-0.9 (ML), accelerator number: 1.4-0.7 (ML)Mixing tank: add 3/4 of water to the phosphating tank and heat to 40-45 DEG C. Add chemicals in the following order

18、:1, BONDERITE910Mu 150KG.2, Grano, Starter, 6540kg.3, Accelerator 131, 1.3L4, Additive 311, 40kg5, Additive 3159, kgRemark: Accelerator131 and GranoStarter65 should be dissolved in water first by volume ratio of 1:2. Join Bonderite910RACan increase the total acidity a little.Third washTank volume: 1

19、.5 cubic meters, temperature: room temperature: not less than 30 seconds, pressure: 0.4Pa, bath liquid: tap waterControl point: pH value 6.0-7.0Discharge cycle: 1 weeksFourth washTank volume: 1.5 cubic meters, temperature: room temperature: not less than 30 seconds, pressure: 0.4Pa, bath liquid: tap

20、 waterControl point: pH value less than 7Discharge cycle: 1 weeksPure water washingTank volume: 1.5 cubic meters, temperature: room temperature: not less than 30 seconds, pressure: 0.4Pa, bath liquid: tap waterControl point: pH value less than 7Discharge cycle: 1 weeks4. quality of phosphating filmA

21、fter treatment by this machine, should form a layer of dense phosphating film on the surface of the workpiece, delicate texture, uniform, no threadbare phenomenon, such as toLower national standards:GB 6807-86 technical condition of phosphating treatment before coating of iron and steel partsSurface

22、 corrosion grade and derusting grade of iron and steel before GB/T 8923-88 coatingEvaluation of surface roughness grade of steel before GB/T 13288-91 coatingGB/T 13312-91 ancestry method for oil removal before coatingTechnical conditions for phosphating treatment of GB 6807-86 iron and steel workpie

23、ce before coatingThree dusting1. check and clear all the power supply lines and spray gun before cleaning the workpiece. Make sure that the power line of the gun is in good contact with the nozzle when cleaning the spray gunYes, whether the powder supply line is clear with the nozzle), clean the pow

24、der room and the powder supply barrel2. add powder powder to the powder feeding bucket. Switch on the power switch, open the powder blower, and turn on the compressed air3. switch on the electrostatic generator, check whether the parts are working normally, and adjust the voltage and the compressed

25、air pressure to the working target rangeInside, then open the spray gun to test spray4. job: (1) hold the gun, make the muzzle of the powder room test spray;(2) according to the characteristics of the workpiece, adjust the amount of powder out of the spray gun to ensure the quality of the coating;(3

26、) when the job is done, the spray gun is facing the workpiece and keeps the spray gun to the spraying surface at 150-200mm. During the spraying process, the spray gun is horizontal or verticalThe principle of straight, uniform, rectilinear motion performs operations(4) visually inspect the spraying

27、condition so that the surface of the workpiece is completely covered with powder;(5) the structure is complex. The workpiece should be sprayed 1-2 times in the concave and the included angles, so as to guarantee the appearance quality of the coating4. change color(1) thoroughly clean the powder tube

28、 and powder supply barrel(2) sweep the powder tube with compressed air(3) the powder coating will be used in the powder feeding barrel to complete the preparation(4) before starting spraying,Spray the gun in the direction of the powder room5. cleaning of spraying equipment(1) removal and removal of

29、various pipelines for powder drums,(2) wipe the wire, air hose and powder tube with a cloth,(3) clear the remaining powder in the barrel(4) clean the inner wall of the barrel, especially the bottomFour. Dehydration, drying and curing1. start painting line cabinet set and check the temperature range

30、of dehydration drying and curing baking were 120-150 C.2. turn on the motor cooling water switch.3., according to the order of dehydration, drying, curing, baking fan, and then open dehydration, drying, curing, baking, combustion machine.4. set the chain speed at 1.5 m / min. and turn on the chain s

31、peed control key.5. during production, the group leader is responsible for inspecting the operation of power control cabinet.6. shut down, first off dehydration drying, curing baking combustion machine, and then turn off the fan, and finally close its cooling water.7. turn off the chain speed contro

32、l key.8. close the painting line cabinet.Five. CoolingNatural strong cold, make the finished product cool down quickly, easy to examine, carry, packSix. Inspection of sprayed parts1. film thickness (refer to GB/T 1767)Film thickness testerThickness: according to customer demandRequirements: the surface does not allow open at the end, pinhole, no