CN102633034A - Irregular can triplet seven-layer hemming structure and secondary stamping, bottom-buckling and rolling method thereof - Google Patents

Abstract

The invention relates to an irregular can triplet seven-layer hemming structure and a manufacture method thereof and in particular relates to a stamping, bottom-buckling and rolling method. The irregular can triplet seven-layer hemming structure comprises a tank body rolling edge (11) and a can bottom rolling edge (21), wherein the tank body rolling edge (11) is arranged at the outer side; the can bottom rolling edge (21) is arranged at the inner side; the width of the tank body rolling edge (11) is more than that of the can bottom rolling edge (21); and the tank body rolling edge (11) and the can bottom rolling edge (21) are inwards turned and hemmed into a triplet seven-layer hemming structure. The manufacture method comprises the following steps: pre-hemming the bottom edge of a manufactured can body; carrying out primary bottom-buckling, hemming and forming of a can bottom and the tank body on one path of hemming die; and on the basis of the previous steps, carrying out secondary bottom-buckling, hemming and forming again on two paths of hemming dies so as to realize the triplet seven-layer hemming structure. The method is simple, is high in production speed, and can be used for better ensuring the rolling quality.

Description

Curling and sealing method at the bottom of triple seven layers of bead structure of irregular can and the secondary punching press button thereof

Technical field

The present invention relates to triple seven layers of bead structure that relate to irregular can and preparation method thereof, especially curling and sealing method at the bottom of the punching press button.

Background technology

The built-up tin bottom volume seal structure of prior art mainly is to adopt five layers of bead structure of two-fold and the triple seven layers of bead structure of employing seldom partly.

Five layers of bead structure technology of the two-fold of prior art are simple, and its defective is a poor sealing, and easy to leak can not be used for the higher tube jar of requirement leak tightness.

Triple seven layers of bead structure of prior art all adopt be bottom rim roll width greater than can body rim roll width, bottom rim roll and can body rim roll are outwards curling, the bottom rim roll is walked the outer ring at crimping position, the can body rim roll is walked the inner ring at crimping position, sees shown in Figure 1.Its defective of this structure is: one, outward appearance is plain, and a flange 13 is arranged, because the decoration of bottom design often do not conform to can body, so when the bottom rim roll is the outer ring at crimping position, influence the whole decoration result of can body; Two, consumptive material is many, and there is a joint portion 12 in bottom 1 with can body 2, makes that the bottom consumable quantity is big; Three, internal volume is little, because there is a joint portion 12 in bottom 1 with can body 2, this joint portion 12 a part of space of can body 2 that accounted for is so the internal volume that has reduced jar.

The bottom curling and sealing method of the barrel cage of prior art mostly adopts the moulding of volume envelope assembly machine, and its principle is: earlier top at the bottom of the bucket is put on the ladle body, clamps with two dishes then, and top rotation at the bottom of making ladle body with bucket, lean on up the crimping briquetting roller again.At the bottom of making barrel curl along roller grooved curve with the ladle body edge in the top, and after roller leaned on last ladle body fully, crimping basically formed, leans on up with two road correction rollers at last, crimping is compressed, and the elimination resilience, make crimping become needed shape.This kind method mainly is the volume envelope that is used for circular barrel cage.And irregular can is in volume envelope process; Because four limits are not rounded; Volume envelope position every bit and can body centre distance do not wait, and seaming roller can not move in a circle, so the roller of round can is made the volume envelope that the volume envelope mode of circular movement, can body rotation is not suitable for irregular can.Such as, the volume envelope of the special-shaped box that chewing gum box etc. are comparatively little adopts the irregular can curling and sealing apparatus, must be the can body transfixion, and volume envelope roller is done the version of forming movement.Irregular can profiling volume envelope has two kinds of basic versions, and a kind of is a jar type pattern, another kind of right and wrong jar type pattern.This dual mode make seaming roller design and require complicated more, make comparatively difficulty because the turning curvature change is bigger, also make seaming roller increase severely in the inertial change at this place, seriously influenced volume envelope quality, also limited the raising of productive capacity.Occur easily also that the volume envelope is tight, precision is not enough, corrugate, crimping is run over and injure, break etc. and do not meet the phenomenon of quality loop.The volume envelope at the irregular can body of prior art and jar end (top) all adopts double seam.

Summary of the invention

The purpose of this invention is to provide curling and sealing method at the bottom of a kind of irregular can secondary punching press button, its method is simple, and speed of production is fast, can realize triple seven layers of bead structure, guarantees volume envelope quality preferably.

Curling and sealing method at the bottom of the irregular can secondary punching press button of the present invention is characterized in that may further comprise the steps:

(1) the can body base that makes is rolled up in advance;

(2) with at the bottom of the jar, can body buckles end crimping moulding for the first time on one curling die;

(3) on the basis of abovementioned steps (2), on two road curling dies, detain end crimping moulding once more.

Adopt curling and sealing method at the bottom of the above-mentioned irregular can secondary punching press button, can realize triple seven layers of bead structure, method is simple, and speed of production is fast, guarantees volume envelope quality preferably.

Description of drawings

Fig. 1 is the triple seven layers of bead structure structural representation of prior art.

Fig. 2 is a rim roll structural representation before the triple seven layers of bead structure volumes of irregular can of the present invention.

Fig. 3 is a rim roll structural representation after the triple seven layers of bead structure moulding of irregular can of the present invention.

Fig. 4 detains end crimping moulding exploded drawings for the first time.

Fig. 5 detains end crimping moulding figure for the first time.

Fig. 6 is that irregular can is detained end volume seal structure scheme drawing for the first time.

Fig. 7 detains end crimping moulding exploded drawings once more.

Fig. 8 detains end crimping moulding figure once more.

Fig. 9 is that irregular can is detained end volume seal structure scheme drawing once more.

The specific embodiment

Below in conjunction with accompanying drawing invention is done further to detail:

See shown in Figure 2; Built-up tin bottom volume seal structure of the present invention is meant triple seven layers of bead structure, comprises can body rim roll 11, jar end rim roll 21; Said can body rim roll 11 is at skin; Rim roll 21 of the said jar end is at internal layer, the width of said can body rim roll 11 greater than jar at the bottom of the width of rim roll 21, said can body rim roll 11 is triple seven layers of bead structure with jar end rim roll 21 inside turnups.Bead structure like this, therefore a said can body rim roll 11 and jar end rim roll 21 inside turnups do not have observable flange in the can body bottom, and the whole decoration result of can body does not receive the bottom crimping to influence appearance looks elegant.This kind structure can not produce the joint portion 12 of bottom 1 with the can body 2 of prior art yet, thereby has saved the consumptive material of bottom, makes the internal volume of barrel cage become big yet.

Further mode, when thickness H＜0.3 of sheet material, the width of said jar of end rim roll 21 is A, and the width of said can body rim roll 11 is B, and the width B of can body rim roll 11 with jar relation of the width A of end rim roll 21 is: B=A+3mm.As, when we used thickness H was the sheet material of 0.23mm, the width of rim roll 21 was A at the bottom of we adopted jar; And the width of can body rim roll 11 is A+3mm; The volume seal structure crimping surfacing that obtained this moment, smooth, crimping can not produce " iron tongue ", the inner tight of crimping.

Mode further, said can body rim roll 11, a jar end rim roll 21 all scribble sealant before the volume envelope, and so the volume sealing property of being honored as a queen is further strengthened.

Curling and sealing method at the bottom of the secondary punching press button of the present invention:

At first at the bottom of the manufacturing tank: blank at the bottom of on the plate shear raw material being cut into jar, again blank is sent into punch press, utilize mould to accomplish blanking and pull and stretch simultaneously and at the bottom of obtaining jar, that is: shear → blanking and drawing.

Next makes can body:

Raw MAT'L → shearing → volume circle → pressure bone → body forming

The can body base that makes is rolled up in advance; Again with at the bottom of the jar, can body places patrix, counterdie is one curling die 3, detains end crimping moulding for the first time; See Fig. 4, Fig. 5, shown in Figure 6; Said can body rim roll 11 is at skin, and said jar of end rim roll 21 be at internal layer, a said can body rim roll 11 and jar end rim roll 21 inside turnups.Then on the basis of first button end crimping moulding, counterdie is that two road crimpings touch 4, carries out two road crimpings; See Fig. 7, Fig. 8, shown in Figure 9, this moment, gained jar bottom volume seal structure vapor seal was effective through twice crimping flow process; A can body rim roll 11 and jar end rim roll 21 inside turnups; Do not have observable flange in the can body bottom, the whole decoration result of can body does not receive the bottom crimping to influence appearance looks elegant.This kind structure can not produce the joint portion 12 of bottom 1 with the can body 2 of prior art yet, thereby has saved the consumptive material of bottom, makes the internal volume of barrel cage become big yet.

Claims (2)

1. triple seven layers of bead structure of irregular can; Comprise can body rim roll (11); Jar end rim roll (21) is characterized in that said can body rim roll (11) at skin, and said jar of end rim roll (21) is at internal layer; The width of said can body rim roll (11) greater than jar at the bottom of the width of rim roll (21), said can body rim roll (11) and jar end rim roll (21) inwardly turnup are triple seven layers of bead structure.

2. curling and sealing method at the bottom of the triple seven layers of bead structure secondary punching press button of the described irregular can of claim 1 is characterized in that may further comprise the steps:

(1) the can body base that makes is rolled up in advance;

(2) with at the bottom of the jar, can body buckles end crimping moulding for the first time on one curling die;

(3) on the basis of abovementioned steps (2), on two road curling dies, detain end crimping moulding once more.

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