Two-Pieces Can Manufacturing Technology and Equipment

Two , two cans Manufacturing Technology and Equipment
Two cans is a serious alternative to lead-contaminated solder three cans and developed .Two-piece cans is to use a shaped sheet metal , with a press mold by drawing , so that after deep drawing, rolling deformation , a tank bottom of the tank as one of the packaging container . The filled cans after packaging materials , put lid sealing curling , you can get a complete sales package . Because the whole body by the two components , so called two cans.
Two cans with three cans compared with the following advantages. Such as seamless cans , cans and seal the tank bottom no curling , it is hermetically sealed and raw material savings ; cans can be full size and decoration printing ; canning process is simple , high efficiency . But there are shortcomings, such as canning material performance requirements, equipment investment are larger, making technology , equipment and precision molds and other requirements are also higher .
Two cans of the type: the level of cans by a shallow red cans and deep red cans ; tank timber divided by two aluminum cans and two tin cans ( tinplate cans ) ; press molding method of cans have changed thin drawing two cans and deep drawing drawing two cans ; pot divided by round cans and shaped cans. This section only describes the circular tank processing equipment.
( A ) drawing two cans thinning molding and equipment
The earliest drawing two cans thinning is thinning drawing two aluminum cans , and later appeared in thinning drawing tinplate ( tin ) two cans.

Figure 17-13 thinning drawing two cans process flow diagram
1 - plate blanks China; - stamping pre- drawing ; 3 - re-drawing ; 4,5 thinning drawing ; 6 - and then thinning drawing complete molding ; 7 - cutting height cans , trimming
Thinning drawing two cans in the punch die drawing by stretching and molding . The thickness of a slab material 0.3 ~ 0.4mm, after forming the container body thickness of 0.1 ~ 0.14mm, bottom of the tank to maintain the original blank thickness base . This tank is mainly used for beer and carbonated beverages containing gas packaging .
1 drawing two cans thinning process
Thinning of the deep drawing process: raw material ( sheet metal ) → Tu lubricants → cutting ( blank ) → pull → repeatedly washed thinning drawing ( 1 to 3 times per ) → trimming ( cutting flush Guankou ) → washing → drying → → necking spray cans inside and outside surface or flange ( straight canister constriction can be saved ) → decoration printing . Figure 17-13 is thinning drawing two cans process flow diagram .
2 cans thinning drawing two main molding equipment
A complete set of thinning drawing two cans production line is composed of more than a dozen sets of different types of equipment. There are sheet conveyor, oiled machine, multi stamping machines, again oiled machine, shearing machine , billet stacking machine, plastic punching machine, control devices and systems, subsequent processing equipment and ancillary equipment. Most of the equipment and welding three cans same .Complete thinning drawing is the key equipment of punching machine and forming supporting mold .
Drawing thinning can be achieved , the mold is the key , each time forming a mold is different. Canning machine to use more modern composite Can Die . This mold design and manufacture of high to withstand impact and forming compressive stress , and to ensure processing quality and die life. Figure 17-14 shows the punching - stamping pre- drawing - re-drawing the composite structure of the mold , the mold for the picture right curve slide punch stroke curves . The mold can be completed once stamping punching , pre- drawing and re- drawing . Figure 17-15 shows the thinning of the deep drawing and forming composite mold which a stroke can be completed three times thinner drawing and molding .

Figure 17-14 Cutting - Pre drawing - re-drawing the composite mold
1 - redraw punch China; - pre- drawing punch ; 3 - cutting die ; 4 - ring binder ; 5 - plate blank ; 6 - Pre- drawing ring
7 - Pre- drawing die ; 8 - re- drawing die ; 9 - redraw ring ; 10 - mold base
( Two ) deep drawing drawing two cans forming equipment
Pull cupping deep drawing , also known as punch pull cans. It divides light red cans and deep red cans are two shallow red cans just rushed to pull one or two , while the deep red cans need to pull and then washed several times to complete the molding process , the specific impulse and then pull the material used depends on the number of performance and cans height. The remaining processing steps before and after thinning drawing with the same two cans .
Light red cans with round cans , oval cans , square cans and a variety of other special-shaped cans , deep drawn cans only round cans.
Rushed to pull the tank timber thickness 0.2 ~ 0.3mm aluminum plate and tin plate ( tinplate ) .
1 drawing two cans deep drawing process
Punching pull two cans than thinning drawing two cans of simple processing . Figure 17-16 for the red pull cans process flow diagram , the process is: the original sheet ( sheet or roll ) → punched into corrugated sheets coated with a lubricant materials → → Cutting → ​​wafer blanks and then washed pull cup → ( one to many times , depending on tank size dependent ) → forming → tank bottom flange trimming → ​​test .

Figure 17-15 thinning drawing - molded composite mold
1 - Finished China; - tank bottom mold ; 3 - thinning drawing ring ; 4 - mold shell ; 5 - Hose ; 6 - re-drawing the resulting cup tube ; 7 - punch die ; 8 - slider
Punching pull two cans forming, cans and cans throughout the thickness of the slab is essentially the same material , red pull cans material ( stretch ) by a flange at the material flow as compensation . Therefore, the size of the tank punch pull billet depth , material properties , punching mold structure have a greater relationship .

Figure 17-16 punch pull cans canning process flow diagram
1 - slab China; - pre- drawn cup ; 3 - the second drawing cup ; 4 - the third drawn cup ; 5 - shaping and molding down ; 6 - Cutting Trimming
2 Pull Cans forming and punching the main molding equipment
Can punch pull principle shown in Figure 17-17 . Can diameter D of the die is placed on the bad material , a binder ring 3 is pressed around the blank , the diameter d0 of the lower punch die , the blank of the circumferential direction of the plastic deformation shrinkage flow to compensate for the deep drawing periphery longitudinal deformation and maintain the same thickness . Ring binder blank board pressed around , pull in the red restrictor plate blank wrinkling . Q ring binder pressure should be moderate size , too small to prevent wrinkling ; too large hinder drawing . Die clearance should also be appropriate , too big cans and cans will wrinkle wall thickness will increase ; too rushed tension needed on the large, easy bruising and cans .

Figure 17-17 Chong Chong pull schematics pull cans
1 - lower mold China; - board blank ; 3 - ring binder
Chong pull cans commonly main processing equipment : presses and key equipment is supporting mold . Presses used for the long , multi-stage , continuous action of the press ; mold multi- multi- station transfer molds. Figure 17-18 shows the impulse pull cans forming the main equipment configuration diagram . It uses a six -station press and subsequently disposed side by side three double action drawing presses . Each double action drawing presses installed side by side two rows of four successive steps of the mold , they are complete second drawing, third drawing, shaping and trimming the bottom forming and final processing . Other ancillary processing equipment and thinning drawing two identical cans .