Resistance Welding Three Pieces Can Making Technology and Equipment

ERW three cans of steel drum Manufacturing Technology and Equipment
1 ERW three cans
Also known as contact welding resistance welding is the use of strong current through the metal parts of the connection resistance heat generated by the premises , so that solder was molten state , and exert a certain pressure on the welding . ERW three jars of body resistance welded longitudinal seam is connected . ERW three cans will gradually replace the solder pot , because ERW three cans has the following advantages :
( A ) avoid the lead , tin and other goods loaded on pollution and harm to human body .
( 2 ) sealing seam , weld strength with the substrate to achieve the same strength .
( 3 ) overlapping the weld width is small (0.2 ~ 3mm), saving raw materials , tin solder material savings over more than 4% . Weld narrow, printing area increases , beautiful appearance. Weld thickness is small, only 1.2 times the original thickness of the sheet , to facilitate the tank flange, necking, beading sealing and improve the life of the mold and the related quality .
( 4 ) productivity and high degree of automation . Welding speed, up to 750 cans / min, welding length speeds up to 85m/min.
( 5 ) save energy, simplify welding technology and equipment. An automatic welding machine , you can replace the soldered cans production line Cutaway notch , into a round , overcome , soldering and other processes and devices, complete cans of welding work.Their equipment , small footprint, low power consumption , easy operation and sanitation, improved working conditions .
2 ERW three cans processing technology and equipment
Resistance welding and soldering canning canning as also including cans manufacturing, lid manufacture cans cans with lids sealing into three processes. Two kinds of methods in canning lids , cans and bottles for the formation lid sealing bead manufacturing methods and equipment are identical. They differ only in cans manufacturing process , it is here only to introduce their cans manufacturing process.
ERW three cans cans production process is: tank timber slab billet cutting → ​​Feeding → → double sheet detection and exclusion bent into a circle → → → Touch up paint resistance welding seams → drying → ​​flanging .
Automatic ERW cans manufacturing process : the tank physique blank cans placed on automatic molding - resistance welding machines slab library bore by vacuum suction device sent by one feed roller. If the lessons of two plates bonded together , then measured by the detector after its exclusion into aggregates box. Monolithic slab deflection sent through the feed rollers roll bending process , and then enter the three roll forming unit rolled into cylindrical cans . Cans hanging in the operation of the T-bar , by the delivery chain will push plate welded round cans before continuing to push forward, cans by advancing the process in three sections of the track after a Z-shaped lever on both sides by Z-bar the guide groove and the corrector to ensure lap weld , the weld seam and ensure the exact location between wheels , wheel cans after the weld by welding . Welded seam cans should be coated , painted up paint , dry , flanging and other processing ( beading , necking , etc. ) , and finally by the back cover or capping become qualified cans .
3 resistance welding technology and equipment
ERW sewing machine is the key equipment manufacturing cans . Cans for resistance welding electrodes are copper rollers , the rollers around the copper wire as an intermediate electrode , by the middle of the welding current and welding electrode force to seam cans . Shown in Figure 17-10 , during Bodywelder , the electrode resistance is small, cans lap seam resistance is large, it is in between the two intermediate electrodes , through a low voltage and high current , due to take seams melted resistor current thermal effect , the pressure roller electrodes are welded into one. As can be seen from the figure , the current one cycle with two joints , in order to ensure the tightness of the weld , between the melting point should be mutually overlap , but not too much overlap , to prevent overheating burn . Cans of two overlapping edges on both sides must be free of contaminants to ensure uniform resistance , or affect the welding quality .

Figure 17-10 Resistance welding works
1 - Transformer China; - conductive plate ; 3 - step down ; 4 - brazed wheel ; 5 - welded cans ; 6 - Weld ;
Welding seams cans , its tin layer sheet may be damaged , while traces of copper may be deposited , there may be other causes of corrosion of the weld . Therefore, after the welding seam cans coated with a protective layer to paint . Protective layer paint coating, coating machine to complete the fill . Cans painted up within the weld , can be powder electrostatic spraying or air spray coating liquid for ; external weld method can be brush painted up . After complement coated cans , to go through the drying device drying before entering the next process. Figure 17-11 is a schematic diagram resistance welding machine cans .
( Three ) bonded three cans of Manufacturing Technology and Equipment
Adhesive three cans with tin-free steel instead of tin plate made ​​three cans. Such cans cans seams organic binder ( such as nylon adhesive ) bonding in lieu of welding . The tank in the United States , Japan and other countries have been widely used in powder , beer, carbonated drinks and other items of packaging, but in our country still belongs study.
Bonding three cans of the manufacturing process with the adhesive pressure sensitive adhesive layer between legal and legitimate two kinds . Corresponding mechanical equipment is also divided into two categories.

Figure 17-11 Schematic cans welding machine
1 - welded parts China; - Weld painted up drying system ; 3 - Console
Production of bonded three cans , just cans into the seam welding equipment and process equipment and process to bond the remaining processes and equipment and welding three cans same .
1 adhesive lamination process
Chromium -plated sheet ( Wuxi plate) coated with the butt end blank cans approximately 5mm in width nylon adhesive in the tank body into a circle when its adhesive overlaps , heated to 260 ℃, heat pressed fully to cure, cooled to room temperature to complete the seam adhesive cans . This process is known in the canning industry adhesive lamination processes.
(2) an adhesive layer bonding process
In chrome plate ( Wuxi board ) cans seams at both ends of the blank , the film -like nylon adhesive heating pressure attached to it , is about the inner plate side seams bread up, so that the outer layer of the end plate lamination will cans seams glued together technology, called lamination processes.
Two well-bonded process gumming device used equipment , pressing devices, heating means and cooling solidification devices.
Figure 17-12 in two cans bonded seams method were cross-sectional view .