CN117900320A

CN117900320A - Multi-station pull ring cover forming equipment and process for vertical turntable structure

Info

Publication number: CN117900320A
Application number: CN202410258089.5A
Authority: CN
Inventors: 钟耀华; 钟云山; 于超发
Original assignee: Foshan Ding Zhong Machinery Co ltd
Current assignee: Foshan Ding Zhong Machinery Co ltd
Priority date: 2024-03-07
Filing date: 2024-03-07
Publication date: 2024-04-19
Anticipated expiration: 2044-03-07
Also published as: CN117900320B

Abstract

The invention relates to the technical field of pull ring cover molding, and discloses a multi-station pull ring cover molding device and process of a vertical turntable structure. According to the process, the special-shaped sheet material with the scribed lines punched on the surface enters the equipment for slicing, and the sheet material is deep-drawn into the ring-drawing cover through shaping treatment in the up-and-down running process of the lower die assembly and the upper die assembly in the revolution process along with the main shaft. The invention solves the problem that the multistation progressive stamping forming die in the prior art is difficult to control the consistency of the groove depth of the pull ring cover, has relatively low equipment cost and wide universality, and can greatly improve the production efficiency of pull ring cover deep drawing forming.

Description

Multi-station pull ring cover forming equipment and process for vertical turntable structure

Technical Field

The invention relates to the technical field of pull ring cover molding, in particular to a multi-station pull ring cover molding device and process of a vertical turntable structure.

Background

The pull ring cover gradually expands the occupancy of the beverage market because of the good use experience of the cover opener in the opening process. At present, in the production process of a pull ring cover at home and abroad, most production lines integrally send rectangular (or square) aluminum plates with certain sizes into a multi-station progressive material pressing piston, and punching and scribing are carried out on the surfaces of the aluminum plates in the previous working procedure stage of a multi-station progressive die; and blanking and deep drawing are carried out at the later working procedure stage of the multi-station progressive die. The production process has high equipment investment cost, is limited by the rigidity (including the punching force) factors of the punching equipment and the punching die in the production process, is extremely easy to generate the phenomenon that the depth of the scribing lines punched by a plurality of die positions is different, and is difficult to control the consistency of the scribing line depth of the aluminum cap product of the pull ring under the condition of mass production. Once such off-grade products are introduced into the market, they either reduce the sealing performance of the tab aluminum lid or increase the difficulty of opening for the consumer.

Therefore, novel pull ring cover deep drawing forming equipment is needed, and the problem of consistency control of the scribing depth of the pull ring cover product is solved.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a multi-station pull ring cover forming device and process of a vertical turntable structure, and the aims of low manufacturing cost, high production efficiency and stable quality of a score line of pull ring cover deep drawing forming are fulfilled. The technical scheme of the invention is as follows:

The multi-station pull ring cover forming equipment with the vertical turntable structure is of a multi-station turntable type vertical structure and comprises a main shaft, wherein the lower part of the main shaft is fixed on a table panel through a first bearing and a base of the bearing, and the upper end of the main shaft is fixed on the table panel through a second bearing, a flange seat, a fixing frame and an upright post; the main driving motor of the equipment drives the main shaft to rotate through a synchronous pulley at the lower end of the main shaft, and drives a front working procedure shaft system and a rear working procedure shaft system which work cooperatively with the equipment to rotate through gears; the upper die rotating disc is fixedly connected with the main shaft through a flat key and a nut to form a whole, and revolves around the axis along with the main shaft;

A plurality of die positions are uniformly distributed along the circumferential direction of the main shaft, each die position is provided with a set of stamping forming die, each set of stamping forming die comprises a lower die assembly, an upper die assembly and a material pressing piston, the lower die assemblies are uniformly distributed on the lower die turntable, the material pressing pistons are uniformly distributed on the upper die turntable, and the upper die assemblies are uniformly distributed on the upper disc; the lower die turntable and the upper die assembly respectively carry the lower die assembly and the upper die assembly to revolve around the axis along with the main shaft, meanwhile, the lower die assembly moves up and down under the combined action of the lower die cam and the sector cam, and the upper die assembly moves up and down under the combined action of the upper end face cam and the cylindrical cam;

On the lower die turntable, the lower die assembly of each die position moves along the axis direction of the main shaft while revolving along the axis of the main shaft, a lower die cam is arranged to push the lower die assembly to ascend, and a sector cam is arranged to be matched with the track surface design of the lower die cam; the lower die cam is matched with the sector cam, so that all lifting actions of the lower die assembly are completed within a circle;

The material pressing piston of each die position is aligned with the lower die assembly below in the circumferential direction on the upper die turntable; a first spring is arranged above each material pressing piston, the first spring and the material pressing pistons are fixed on the upper die rotating disc through a screw sleeve above the first spring, and the material pressing pistons slide up and down in the upper die rotating disc;

the upper die assembly of each die position slides up and down in the upper disc on the upper disc; the upper end face cam and the cylindrical cam arranged above the upper die assembly are fixed on the fixing frame, and the upper die assembly slides up and down along the track designed by the upper end face cam and the cylindrical cam in the revolution process of the main shaft.

Further, the upper die assembly is provided with a punch fixed at the lower part of the punch rod and a bearing six fixed at the upper part of the punch rod through a transverse shaft; a bearing five is arranged and fixed at one end of the transverse shaft, and an upper die guide rod is arranged and fixed at the other end of the transverse shaft; compressed air is blown to the lower end face of the punch through the central hole of the punch and the central through hole of the punch by the pneumatic element at the upper part of the punch, and the air distribution disc above the main shaft controls the on-off of the compressed air flow.

Further, the punch is positioned at the center of the pressing piston, the middle part of the punch rod is matched with the hole of the upper disc, and the matching of the upper die guide rod and the corresponding hole of the upper disc ensures that the upper die assembly maintains a correct direction and cannot rotate around the axis of the upper die assembly while revolving around the main shaft; the upper die assembly revolves around the main shaft and simultaneously realizes lifting action of the upper die assembly along the axial direction of the main shaft through the cooperation of the bearing five and the cylindrical cam; in the range of an angle interval for drawing the sheet by matching the punch with the lower die, an upper end cam is arranged below the fixing frame, and the punch is ensured to have larger punching drawing force required by drawing the sheet between the punch and the lower die through the upper end cam, the bearing six and the punch rod.

Further, a lower die with a conical concave surface is designed on the top end surface of the lower die assembly, and the lower die is fixedly connected with the mandrel and the lower die holder; the guide shaft penetrates through the bearing III; the positioning shaft is of a hollow structure, the lower end of the positioning shaft is inserted into a top center hole of the mandrel, and the positioning shaft is positioned with the mandrel by a guide ring; a third spring is arranged outside the positioning shaft, the upper part of the third spring supports a connector of the top cover plug and the positioning shaft, and the lower part of the third spring is supported on the upper end surface of the mandrel; when the upper part is pressed, the connecting body of the top cover plug and the positioning shaft slides downwards in the central hole of the upper part of the mandrel; after the pressure disappears, under the action of the spring III, the connection body between the top cover plug and the positioning shaft rises along with the pressure; and controlling the adsorption or blowing-off action of the top cover plug top to the upper sheet material through the air passage on the side surface of the mandrel. The lower die assembly is integrally supported on the top surface of the lower die cam by a bearing III at the lower part, and can ascend along with the top surface of the cam of the lower die cam while revolving around the main shaft; in a certain angle interval around the axis of the main shaft, a sector cam is arranged, and in the area needing to descend, the lower die assembly is pulled to a lower position through the sector cam and the roller. Under the combined action of the bearing III, the lower die cam, the roller and the sector cam in the lower die assembly, the lower die assembly can revolve around the main shaft and can lift along the axial direction of the main shaft. The actions of feeding sheets, deep drawing and discharging covers in each rotation range of the main shaft are realized, and the air distribution disc above the main shaft controls the on-off of compressed air flow. The lower die guide rod is matched with the lower die turntable, so that the lower die assembly can maintain the correct direction while revolving, and the rotation phenomenon can not be generated when revolving around the main shaft around the axis of the lower die assembly.

The cylindrical cam is in a complete ring shape in top view section, an upper die cam track is arranged, the upper die cam track is 匚 -shaped, a bearing five on one side of the top of the upper die assembly is embedded in the upper die cam track, and the running height of the upper die assembly when the upper die assembly revolves around the main shaft is limited; the top-view section of the upper end face cam is a ring shape with a slightly larger than one quarter, and the installation position of the upper end face cam is matched with the circumference of the cylindrical cam; along the circumference of the cylindrical cam, the track surface height of the upper die cam track is higher in the area without the distribution of the upper end face cams and is lower in the area with the distribution of the upper end face cams; when the upper die assembly moves to a region with upper end cam distribution, the bottom of the upper end cam is contacted with the top of the upper die assembly. When the upper die assembly revolves around the main shaft, the upper die assembly moves upwards when moving to a region without the distribution of the upper end face cams under the combined action of the upper end face cams and the cylindrical cams, and moves downwards when moving to a region with the distribution of the upper end face cams. Therefore, the upper die assembly slides up and down according to the designed track under the combined action of the upper end face cam and the cylindrical cam.

The overlooking section of the lower die cam is in a complete ring shape, and a lower die cam track is arranged, and faces upwards and props against the bottom of the lower die assembly, so that the running height of the lower die assembly when the lower die assembly revolves around the main shaft is limited; the sector cam is in an annular shape with a top view section slightly larger than one quarter, and the installation position of the sector cam is matched with the circumference of the lower die cam; along the circumference of the lower die cam, the track surface height of the lower die cam track is lower in the area without the sector cam distribution and higher in the area with the sector cam distribution; when the lower die assembly moves to an area with sector cams distributed, the lower edge of one side of each sector cam is contacted with the roller of the lower die assembly, and the height of the lower die assembly is controlled. When the lower die assembly revolves around the main shaft, the lower die assembly moves downwards when moving to the area without the distribution of the sector cams and moves upwards when moving to the area with the distribution of the sector cams under the combined action of the sector cams and the lower die cams. Therefore, the lower die assembly slides up and down according to the designed track under the combined action of the sector cam and the lower die cam.

The invention provides a multi-station pull ring cover forming device based on a vertical turntable structure, which comprises the following steps:

The device of the invention utilizes the special-shaped sheet material plate which is blanked and is stamped with a certain shape and depth on the surface to carry out the drawing processing of the drawing ring cover, and the drawing ring cover which is drawn and stamped is sent to the next production process at the output position of the device.

The multi-station drawing and stamping forming dies of the equipment are uniformly distributed along the center of the main shaft, and all the drawing and stamping forming dies revolve along the main shaft along with the turntable. Each set of stamping forming dies receives a sheet at a sheet input position for each revolution. In the process of rotating along with the main shaft, the upper die assembly and the lower die assembly are matched in action, and the pull ring cover is pulled out. And outputting the pull ring cover which is subjected to drawing forming to the equipment at the output position of the turntable, and completing the drawing action of the equipment.

In the production process of the front-end working procedure, a special blanking machine is utilized to punch out the special-shaped sheet material. Stamping a scribing line with a required shape and depth on the surface of the sheet stock, stacking the special-shaped sheet stock into a sheet separating mechanism positioned at the input position of the pull ring cover forming equipment, and respectively discharging a sheet stock from each die position of the equipment through the sheet separating action of the sheet separating mechanism, wherein the upper die assembly and the lower die assembly are matched in the revolution process of the sheet stock along with a main shaft, so that the sheet stock is deep drawn into a pull ring cover; at the output position, the tab cover is output from the device.

At the position of the sheet feeding point, the sheet is fed into the upper surface of the lower die assembly of the equipment, and the sheet is positioned on the upper surface of the lower die turntable and is adsorbed by the lower die assembly, so that the sheet is ensured not to be thrown out of the surface of the punch forming die under the action of centrifugal force in the subsequent revolution process. After being punched into a pull ring cover by a punching forming die of the equipment, the sheet material is turned out of the equipment at a cover outlet point position and enters the subsequent processing procedure.

The pull ring cover forming process comprises the following steps:

Step S1, feeding: the special-shaped sheet material with the scribed line punched on the surface is fed at a sheet feeding point of the multi-station pull ring cover forming equipment of the vertical turntable structure;

step S2, lifting tablets: the lower die assembly which adsorbs the sheet material revolves and is jacked up and lifted by the track surface of the lower die cam track;

step S3, pre-bending: the lower die assembly which adsorbs the sheet continuously ascends while revolving, and the interaction of the lower die assembly and the pressing piston carries out pre-bending treatment on the special-shaped sheet;

Step S4, stretching: the upper die assembly descends to stretch the special-shaped sheet, and most of the special-shaped sheet is pulled into the lower die except the ear part of the special-shaped sheet;

step S5, lower die rollback: the lower die assembly descends to separate the lower die from the matched conical surface of the pressing piston; the punch and the lower die assembly synchronously descend while the lower die assembly descends;

Step S6, full stretching: the lower die assembly descends to the next highest position and is maintained, and the upper die assembly continues to descend to the lowest position of the punch head, so that the drawing of the aluminum cap of the pull ring is completed;

Step S7, shaping: the lower die assembly and the upper die assembly synchronously ascend until the lower die pushes the pressing piston to a proper high position, and the formed pull ring aluminum cover is shaped;

Step S8, synchronously descending the upper die and the lower die: the upper die assembly, the lower die assembly and the formed pull ring aluminum cover synchronously descend until the lower die and the pressing piston are separated from contact, and the upper die assembly stops descending and keeps the height;

step S9, the lower die descends: the lower die assembly continues to move downwards, and the top surface of the top cover plug keeps the adsorption effect on the formed pull ring aluminum cover in the process;

Step S10, cover discharging: the upper die assembly moves upwards to the highest position, the lower die assembly adsorbs the formed pull ring aluminum cover to move downwards to the height of the cover, the equipment is output at the position of the cover outlet position, and then the lower die assembly continues to move downwards to the lowest position to wait for the next working cycle.

Further, the steps S1-S10 included in the pull ring cover forming process provided by the invention are specifically as follows:

Step S1: the special-shaped sheet materials with the scribed lines punched on the surface are stacked and separated by a sheet separating mechanism at a sheet feeding point, and a sheet material is placed above each lower die assembly along with the rotation of the main shaft; the orientation of the sheet falling is the same as the special-shaped outline in the locating sleeve at the top of the lower die. After the sheet falls, the sheet is absorbed by a top cover plug in the lower die assembly while being positioned by a positioning sleeve;

step S2: the lower die assembly which adsorbs the sheet material revolves and is jacked up and lifted by the track surface of the lower die cam track;

Step S3: the lower die assembly which adsorbs the sheet continuously ascends while revolving, and the top conical surface of the lower die interacts with the conical surface of the lower end surface of the pressing piston to extrude the special-shaped sheet into a shallow conical disc-shaped structure. At the moment, the lower die assembly is lifted to the highest point position under the action of the lower die cam and is kept at a high position;

step S4: the upper die assembly descends under the combined action of the upper end face cam and the cylindrical cam, the punch pulls the special-shaped sheet into the middle cylindrical hole of the lower die, and most of the sheet is pulled into the middle cylindrical hole of the lower die except for the ear part of the special-shaped sheet which is left in the conical matching area of the lower die and the pressing piston;

step S5: the lower die assembly descends under the action of the sector cam, so that the lower die is separated from the matched conical surface of the pressing piston; the punch and the lower die assembly simultaneously descend while the lower die assembly descends.

Step S6: the lower die assembly descends to the next highest position and is kept, the upper die assembly and the punch continue to descend to the lowest position of the punch under the combined action of the upper end face cam and the cylindrical cam, and the drawing of the aluminum cap of the pull ring is completed. In the drawing process, the upper conical surface of the lower die is not contacted with the lower conical surface of the pressing piston, and the pressing piston has no pressing force on the sheet material.

Step S7: the lower die assembly and the upper die assembly synchronously rise until the lower die pushes the material pressing piston to a proper high position, so that the upper conical surface of the lower die and the lower conical surface of the material pressing piston are elastically stressed (namely, the material pressing force) again. In this state, the formed aluminum tab cap is shaped by using the outer cylindrical surface of the punch and the central inner cylindrical hole of the lower die, the upper conical surface of the lower die and the lower conical surface of the swage piston, so as to eliminate wrinkles generated at the cap body or tab ear part in the previous process.

Step S8: the upper die assembly and the lower die assembly synchronously descend together with the formed pull ring aluminum cover until the top conical surface of the lower die and the lower conical surface of the pressing piston are separated from contact, and the upper die assembly stops descending and keeps high.

Step S9: the lower die assembly continues to descend, and in the descending process of the lower die assembly, the top surface of the top cover plug always keeps the adsorption effect on the aluminum cover surface part by utilizing negative pressure air, so that the aluminum cover cannot be thrown out of the turntable under the action of centrifugal force in the revolution process of the turntable.

Step S10: when the lower die assembly descends to a certain height and the top cover plug and the lower die simultaneously descend, the upper die assembly starts to ascend to the highest position under the action of the cylindrical cam and waits for the next working cycle; the lower die assembly adsorbs the formed aluminum tab cover to descend to the height of the cover, and the formed aluminum tab cover is output from the device at the position of the cover outlet position and is transferred to the next forming process. Subsequently, the lower die assembly continues to descend to the lowest position, waiting for the next work cycle, ready to adsorb the profiled sheet input for the next work cycle.

Compared with the prior art, the invention has the beneficial effects that:

1. According to the equipment and the process disclosed by the invention, sheet material is used for inputting, and the pull-ring aluminum cover is subjected to deep drawing forming; the whole equipment adopts a vertical multi-station turntable structure, so that the production efficiency of the pull ring aluminum cover deep drawing forming stage can be greatly improved;

2. The invention sets a plurality of completely consistent stamping forming dies which are uniformly distributed along the center of the main shaft, and all the stamping forming dies revolve along the main shaft along with the turntable, thereby solving the problem that the consistency of the line depth of the aluminum cap product of the pull ring is difficult to control because a rectangular aluminum plate is integrally fed into a multi-station progressive stamping forming die in the prior art;

3. The device has low cost and wide universality, and can be suitable for the production of pull ring aluminum caps (iron caps) and common aluminum caps (iron caps) and crown caps.

Drawings

FIG. 1 is a front cross-sectional view of the overall assembly of the apparatus of the present invention;

FIG. 2 is a schematic top plan view of the M-M direction of FIG. 1;

FIG. 3 is a front cross-sectional view of upper die assembly 14 and upper die guide bar 62;

fig. 4 is a front cross-sectional view of the lower die assembly 6 and the lower die guide bar 30;

fig. 5 is a schematic diagram showing the structural cooperation of the upper die assembly 14 and the cylindrical cam 17, and the upper end face cam 16;

FIG. 6 is a schematic view of the positions of the upper die assembly 14 and the upper end cam 16 when the outer circumferential surface of the cylindrical cam 17 is extended;

FIG. 7 is a cross-sectional view taken along the direction A-A in FIG. 6;

FIG. 8 is a sectional view taken in the direction B-B of FIG. 6;

fig. 9 is a schematic diagram showing the structural cooperation of the lower die assembly 6 and the lower die cam 5, and the sector cam 4;

fig. 10 is a schematic view showing the positions of the lower die assembly 6 and the sector cam 4 when the outer circumferential surface of the lower die cam 5 is unfolded;

FIG. 11 is a cross-sectional view taken in the direction C-C of FIG. 10;

FIG. 12 is a sectional view taken in the direction D-D of FIG. 10;

FIG. 13 is a schematic view of a tab cover shaped sheet material structure for input into the apparatus of the present invention;

fig. 14 is a front, left, top view of a pull ring cover output by the apparatus of the present invention.

Wherein: 1-a synchronous pulley; 2-gear; 3-a bearing base; 4-sector cams; 5-lower die cams; 6-a lower die assembly; 7-bearing I; 8-a lower die turntable; 9-an upper die turntable; 10-pressing a material piston; 11-spring one; 12-a screw sleeve; 13-upper disc; 14-an upper die assembly; 15-fixing frames; 16-upper end face cam; 17-a cylindrical cam; 18-a second bearing; 19-a main shaft; 20-a flange seat; 30-a lower die guide rod; 31-a guide shaft; 32-bearing three; 33-a lower die holder; 34-a roller; 35-mandrel; 36-bearing IV; 37-spring two; 38-sealing rings; 39-positioning a shaft; 40-guiding ring; 41-spring three; 42-lower die; 43-a cap plug; 60-punching heads; 61-punch; 62-upper die guide bar; 63-bearing five; 64-a bearing six; 65-horizontal axis.

Detailed Description

The invention is further illustrated by the following figures and examples, which are not intended to be limiting.

The invention aims to provide novel multi-station pull ring cover forming equipment with a vertical turntable structure, which has the advantages of low manufacturing cost, high production efficiency and stable scribing quality. The device is suitable for the production and processing of thin-wall structure covers such as pull-ring aluminum (iron) covers, cylindrical aluminum (iron) covers, crown covers and the like, and has wide applicability. In this embodiment, a pull-tab aluminum cap is taken as an example.

The device of the invention utilizes the special-shaped sheet aluminum plate which is blanked and is stamped with a certain shape and depth on the surface to carry out the drawing processing of the aluminum cap of the pull ring, and the aluminum cap of the pull ring which is deep-stamped is sent to the next production process at the output position of the device.

The multi-station drawing and stamping forming dies of the equipment are uniformly distributed along the center of the main shaft, and all the drawing and stamping forming dies revolve along the main shaft along with the turntable. Each set of stamping forming die receives a sheet of aluminum sheet at the sheet input position every revolution. In the process of rotating along with the main shaft, the upper die assembly and the lower die assembly are matched in action, and the pull ring aluminum cover is drawn. And outputting the pull ring aluminum cover which is subjected to drawing forming to the equipment at the output position of the turntable, and completing the drawing action of the equipment.

The device is of a multi-station turntable type vertical structure and comprises a main shaft 19, wherein the lower part of the main shaft 19 is fixed on a table plate through a first bearing 7 and a bearing base 3, and the upper end of the main shaft 19 is fixed on the table plate through a second bearing 18, a flange seat 20, a fixing frame 15 and a stand column (not shown in the figure). The main driving motor of the equipment drives the main shaft 19 to rotate through the synchronous pulley 1 at the lower end of the main shaft 19, and drives a front working procedure shafting and a rear working procedure shafting which work cooperatively with the equipment to rotate through the gear 2; the lower die rotary table 8, the upper die rotary table 9 and the upper plate 13 are fixedly connected with the main shaft 19 into a whole through flat keys and nuts, and revolve around the axis along with the main shaft.

In this embodiment, 24 die positions are uniformly distributed along the axis of the spindle.

Along main shaft circumferencial direction, 24 mould positions have evenly distributed, every mould position is equipped with one set of stamping forming die, every set stamping forming die includes lower mould subassembly, goes up mould subassembly and swage piston. Namely, 24 lower die assemblies 6 are uniformly distributed on the lower die turntable 8, 24 pressing pistons 10 are uniformly distributed on the upper die turntable 9, and 24 upper die assemblies 14 are uniformly distributed on the upper disc 13. The lower die turntable 8 and the upper die assembly 14 respectively carry the lower die assembly 6 and the upper die assembly 13 to revolve around the axis along with the main shaft, and simultaneously, the lower die assembly 6 moves up and down under the combined action of the lower die cam 5 and the sector cam 4; the upper die assembly 14 moves up and down by the combined action of the upper face cam 16 and the cylindrical cam 17.

On the lower die turntable 8, the lower die assembly 6 of each die position revolves along the axis of the main shaft 19 and moves along the axis direction of the main shaft 19, the lower die cam 5 pushes the lower die assembly 6 upward, and the sector cam 4 drives the lower die assembly 6 downward. The lower die cam 5 is matched with the sector cam 4, so that all lifting actions of the lower die assembly 6 are completed within a circle.

On the upper die turntable 9, the blanking piston 10 of each die position is aligned in the circumferential direction with the lower die assembly 6 below. A first spring 11 is arranged above each pressing piston 10, the first spring 11 and the pressing pistons 10 are fixed on the upper die turntable 9 through a threaded sleeve 12 above the first spring 11, and the pressing pistons 10 slide up and down in the upper die turntable 9.

On the upper plate 13, the upper die assembly 14 of each die position slides up and down within the upper plate 13. The upper end cam 16 and the cylindrical cam 17 above the upper die assembly 14 are fixed on the fixed frame 15, and the upper die assembly 14 slides up and down along the track designed by the upper end cam 16 and the cylindrical cam 17 in the process of revolving along the main shaft 19.

As shown in fig. 3, the upper die assembly 14 is schematically shown in detail, and the punch 60 is fixed to the lower portion of the punch 61, and the bearing six 64 is fixed to the upper portion of the punch 61 via the cross shaft 65. The fifth bearing 63 is fixed to one end of the cross shaft 65, and the upper die guide rod 62 is fixed to the other end of the cross shaft 65. Compressed air is blown to the lower end face of the punch 60 through the central hole of the punch 61 and the central through hole of the punch 60 by the pneumatic element at the upper part of the punch 61, and the air distribution disc above the main shaft 19 controls the on-off of the air flow of the compressed air.

The punch 60 is located at the center of the pressing piston 10, the middle part of the punch rod 61 is matched with the hole of the upper disc 13, and the matching of the upper die guide rod 62 and the corresponding hole of the upper disc 13 ensures that the upper die assembly 14 maintains the correct direction and cannot rotate around the axis of the upper die assembly while revolving around the main shaft 19. The upper die assembly 14 revolves around the main shaft 19, and the lifting action of the upper die assembly 14 along the axial direction of the main shaft 19 is realized through the cooperation of the bearing five 63 and the cylindrical cam 17. An upper end cam 16 is provided below the holder 15 in an angle range in which the punch 60 and the lower die 42 cooperate to draw the sheet. The upper end cam 16, the bearing six 64 and the punch 61 ensure a large drawing force required for drawing the sheet material between the punch 60 and the lower die 42.

The detailed structure of the lower die assembly 6 is shown in fig. 4, and the top end surface is provided with a lower die 42 with a conical concave surface, which is fixedly connected with a mandrel 35 and a lower die holder 33; the bearing III 32 is connected with the mandrel 35, and the guide shaft 31 passes through the bearing III 32; the top cover plug 43 is fixedly connected with the positioning shaft 39, the positioning shaft 39 is of a hollow structure, the lower end of the positioning shaft 39 is inserted into a top end center hole of the mandrel 35, and the positioning shaft is positioned with the mandrel 35 by utilizing the guide ring 40. The outside of the positioning shaft 39 is provided with a third spring 41, the upper part of the third spring 41 supports a connector of the top cover plug 43 and the positioning shaft 39, and the lower part of the third spring 41 is supported on the upper end surface of the mandrel 35. When the upper part is pressed, the connector of the top cover plug 43 and the positioning shaft 39 slides downwards in the upper central hole of the mandrel 35; after the pressure is removed, the connection between the top cover plug 43 and the positioning shaft 39 rises under the action of the third spring 41. The suction or blowing action of the top surface of the top cover plug 43 on the upper sheet material is controlled through the air passage on the side surface of the mandrel 35. The lower die assembly 6 as a whole is supported on the top surface of the lower die cam 5 by a bearing III 32 at the lower part, and the lower die assembly 6 can ascend along with the cam top surface of the lower die cam 5 while revolving around the main shaft 19; in a certain angle section around the spindle axis, the sector cam 4 is arranged, and in a region where lowering is required, the lower die assembly 6 is pulled to a lower position by the sector cam 4 and the roller 34. The lower die assembly 6 is lifted along the axial direction of the main shaft while revolving around the main shaft 19 by the combined action of the bearing III 32 and the lower die cam 5 in the lower die assembly 6 and the roller 34 and the sector cam 4. The actions of feeding sheets, deep drawing and discharging covers in each rotation range of the main shaft are realized, and the air distribution disc above the main shaft 19 controls the on-off of the compressed air flow. The lower die guide rod 30 is provided with a second spring 37, and the cooperation of the lower die guide rod 30 and the lower die turntable 8 ensures that the lower die assembly 6 maintains the correct direction while revolving around the spindle 19, and does not generate a rotation phenomenon while revolving around the spindle around the axis of the lower die assembly.

Fig. 5 is a schematic view showing the structural cooperation of the upper die assembly 14 with the cylindrical cam 17 and the upper end cam 16, fig. 6 is a schematic view showing the positions of the upper die assembly 14 and the upper end cam 16 when the outer circumferential surface of the cylindrical cam 17 is unfolded, and fig. 7 and 8 are sectional views in the directions A-A and B-B in fig. 6, respectively. As can be seen in fig. 5-8, the cylindrical cam 17 has a complete ring-shaped top view section, and is provided with an upper mold cam track, wherein the upper mold cam track has a shape of 匚, and a bearing five 63 on one side of the top of the upper mold assembly 14 is embedded therein to limit the running height of the upper mold assembly 14 when revolving around the main shaft 19; the top surface cam 16 is in a ring shape with a top cross section slightly larger than one quarter, and the installation position of the top surface cam 16 is matched with the circumference of the cylindrical cam 17; along the circumference of the cylindrical cam 17, the track surface height of the upper die cam track is higher in the area where no upper end face cam 16 is distributed and lower in the area where the upper end face cam 16 is distributed; when the upper die assembly 14 is run to an area where the upper face cams 16 are distributed, the bottom of the upper face cams 16 are in contact with the top of the upper die assembly 14. When the upper die assembly 14 revolves around the main shaft 19, the upper die assembly moves upward when moving to a region where no upper face cam 16 is located under the combined action of the upper face cam 16 and the cylindrical cam 17, and moves downward when moving to a region where the upper face cam 16 is located. Therefore, the upper die assembly 14 slides up and down along a designed trajectory by the combined action of the upper face cam 16 and the cylindrical cam 17.

Fig. 9 is a schematic view showing the structural cooperation of the lower die assembly 6 with the lower die cam 5 and the sector cam 4, fig. 10 is a schematic view showing the positions of the lower die assembly 6 and the sector cam 4 when the outer circumferential surface of the lower die cam 5 is unfolded, and fig. 11 and 12 are sectional views in the directions C-C and D-D in fig. 10, respectively. As can be seen in fig. 9-12, the top view section of the lower die cam 5 is a complete ring shape, and is provided with a lower die cam track, the lower die cam track faces upwards and abuts against the bottom of the lower die assembly 6, so as to limit the running height of the lower die assembly 6 when revolving around the main shaft 19; the section of the sector cam 4 in a top view is a ring shape with a slightly larger than one quarter, and the installation position of the sector cam 4 is matched with the circumference of the lower die cam 5; along the circumference of the lower die cam 5, the track surface height of the lower die cam track is lower in the area where the sector cams 4 are not distributed and is higher in the area where the sector cams 4 are distributed; when the lower die assembly 6 moves to the area where the sector cams 4 are distributed, one side lower edge of the sector cams 4 contacts with the rollers 34 of the lower die assembly 6, and the height of the lower die assembly 6 is controlled. When the lower die assembly 6 revolves around the main shaft 19, the lower die assembly moves downward in the area where the sector cams 4 are not distributed and moves upward in the area where the sector cams 4 are distributed under the combined action of the sector cams 4 and the lower die cams 5. Therefore, the lower die assembly 6 slides up and down along the designed trajectory by the combined action of the sector cam 4 and the lower die cam 5.

The invention provides a multi-station pull ring cover forming process based on a vertical turntable structure. The special-shaped aluminum sheet material used in the production of the pull-tab aluminum cap by the apparatus of the present invention is shown in fig. 13. In the production process of the front-end process, a special blanking machine is utilized to punch the special-shaped sheet shown in fig. 13. Stamping a scribing line with a required shape and depth on the surface of the sheet material, stacking the special-shaped sheet material into a sheet separating mechanism which is arranged at an input position of the equipment, and respectively discharging a sheet of sheet material from each die position of the equipment through the sheet separating action of the sheet separating mechanism, wherein the upper die assembly and the lower die assembly are matched in the revolution process of the sheet material along with a main shaft, so that the sheet material is deep-drawn into a pull ring aluminum cover; and outputting the pull ring aluminum cover to the equipment at the output position. The output tab aluminum cap from this apparatus is shown in fig. 14.

By utilizing the special-shaped sheet material with the shape shown in fig. 13, the device is matched with the lower die assembly 6, the upper die assembly 14 and the material pressing piston 10 in the revolution process around the main shaft 19, the aluminum cap with the shape shown in fig. 14 is drawn by stamping, and the aluminum cap is turned out of the device at the position of the cap outlet point shown in fig. 2 to enter the next production process.

At the sheet-feed point position in fig. 2, a tab cap shaped sheet (aluminum sheet) having a shape as shown in fig. 13 is fed to the upper surface of the lower die assembly 6 of the present apparatus, and the aluminum sheet is positioned on the upper surface of the lower die turntable 8 and is sucked by the lower die assembly 6, ensuring that it is not thrown out of the surface of the press forming die under the effect of centrifugal force in the subsequent revolution process. After being punched into a pull ring cover shown in fig. 14 by a punching forming die of the equipment, the aluminum sheet material is turned out of the equipment at the position of the cover outlet position shown in fig. 2 and enters the subsequent processing procedure.

The pull ring cover forming process comprises the following steps S1-S10:

Step S2, lifting tablets: the lower die assembly 6 which adsorbs the sheet material revolves and is lifted up by the cam track surface of the lower die cam 5;

Step S3, pre-bending: the lower die assembly 6 which adsorbs the sheet continuously ascends while revolving, and the lower die assembly 6 interacts with the pressing piston 10 to pre-bend the special-shaped sheet;

Step S4, stretching: the upper die assembly 14 descends to stretch the special-shaped sheet, and most of the special-shaped sheet is pulled into the lower die 42 except the ear part of the special-shaped sheet;

step S5, lower die rollback: the lower die assembly 6 descends to separate the lower die 42 from the matched conical surface of the pressing piston 10; simultaneously with the descent of the lower die assembly 6, the punch 60 and the lower die assembly 6 descend synchronously;

step S6, full stretching: the lower die assembly 6 descends to the next highest position and keeps, and the upper die assembly 14 continues to descend to the lowest position of the punch 60, so that the drawing of the aluminum cap of the pull ring is completed;

step S7, shaping: the lower die assembly 6 and the upper die assembly 14 synchronously ascend until the lower die 42 pushes the material pressing piston 10 to a proper high position, and the formed aluminum cap with the pull ring is shaped;

Step S8, synchronously descending the upper die and the lower die: the upper die assembly 14 and the lower die assembly 6 together with the formed aluminum cap of the pull ring synchronously descend until the lower die 42 and the pressing piston 10 are out of contact, and the upper die assembly 14 stops descending and keeps high;

Step S9, the lower die descends: the lower die assembly 6 continues to descend, and the top surface of the top cover plug 43 keeps the adsorption effect on the formed pull ring aluminum cover in the process;

Step S10, cover discharging: the upper die assembly 14 moves up to the highest position, the lower die assembly 6 adsorbs the formed aluminum tab cover to move down to the height of the cover, the equipment is output at the position of the cover outlet, and then the lower die assembly 6 continues to move down to the lowest position to wait for the next working cycle.

The following further explains the mutual action decomposition of the lower die assembly 6, the upper die assembly 14 and the pressing piston 10 in the present apparatus, and the steps S1-S10 included in the pull ring cover forming process provided by the present invention are specifically as follows:

Step S1: the shaped sheet materials, which have been surface-punched with score lines and cut into the shape shown in fig. 13, are stacked in a bundle, separated by a sheet separating mechanism at a sheet feeding point shown in fig. 2, and a sheet of aluminum is placed over each lower die assembly 6 as the main shaft 19 rotates. The direction of the aluminum sheet material falling is the same as the special-shaped outline in the locating sleeve at the top of the lower die. After the aluminum sheet falls, the aluminum sheet is absorbed by the top cover plug 43 inside the lower die assembly 6 while being positioned by the positioning sleeve.

Step S2: the lower die assembly 6, which adsorbs aluminum material, revolves and is lifted up by the cam track surface of the lower die cam 5.

Step S3: the lower die assembly 6, which adsorbs aluminum sheet, continues to ascend while revolving, and the top conical surface of the lower die 42 interacts with the conical surface of the lower end surface of the pressing piston 10 to press the special-shaped sheet into a shallow conical disc structure. At this time, the lower die assembly 6 is lifted to the highest point by the lower die cam 5 and is maintained at the high position.

Step S4: the upper die assembly 14 descends under the combined action of the upper end cam 16 and the cylindrical cam 17, and the punch 60 pulls the special-shaped sheet into the middle cylindrical hole of the lower die 42, and most of the sheet is pulled into the middle cylindrical hole of the lower die 42 except for the ear part of the special-shaped sheet which is left in the conical matching area of the lower die 42 and the pressing piston 10.

Step S5: the lower die assembly 6 descends under the action of the sector cam 4, so that the lower die 42 is separated from the matched conical surface of the pressing piston 10; simultaneously with the descent of the lower die assembly 6, the punch 60 and the lower die assembly 6 descend synchronously.

Step S6: the lower die assembly 6 descends to the next highest position and is kept, the upper die assembly 14 and the punch 60 continue to descend to the lowest position of the punch 60 under the combined action of the upper end face cam 16 and the cylindrical cam 17, and the drawing of the aluminum cap of the pull ring is completed. During this drawing, the upper tapered surface of the lower die 42 is not in contact with the lower tapered surface of the press piston 10, and the press piston 10 does not press the sheet.

Step S7: the lower die assembly 6 and the upper die assembly 14 are synchronously lifted until the lower die 42 pushes the pressing piston 10 to a proper high position, so that the upper conical surface of the lower die 42 and the lower conical surface of the pressing piston 10 have spring force (namely, pressing force) again. In this state, the already formed tab aluminum cap is shaped by using the outer cylindrical surface of the punch 60 and the central inner cylindrical hole of the lower die 42, the upper tapered surface of the lower die 42 and the lower tapered surface of the swage piston 10 to eliminate wrinkles generated at the cap body or tab ear part in the previous process.

Step S8: the upper die assembly 14, lower die assembly 6, together with the already formed tab aluminum cap, are lowered simultaneously until the top tapered surface of the lower die 42 and the lower tapered surface of the swage piston 10 come out of contact, and the upper die assembly 14 stops descending and remains high.

Step S9: the lower die assembly 6 continues to descend. In the descending process of the lower die assembly 6, the top surface of the top cover plug 43 always keeps the adsorption effect on the aluminum cover surface part by utilizing negative pressure air, so that the aluminum cover cannot be thrown out of the turntable due to the action of centrifugal force in the revolution process of the turntable.

Step S10: when the lower die assembly 6 descends to a certain height and the top cover plug 43 and the lower die 42 descend simultaneously, the upper die assembly 14 starts to ascend to the highest position under the action of the cylindrical cam 17 and waits for the next working cycle; the lower die assembly 6 adsorbs the formed aluminum tab cover to descend to the cover outlet height, and the formed aluminum tab cover is output from the device at the cover outlet position shown in fig. 2 and is transferred to the next forming process. Subsequently, the lower die assembly 6 continues to descend to the lowest position, waiting for the next work cycle, ready to adsorb the shaped sheet material input for the next work cycle.

According to the equipment and the process disclosed by the invention, sheet material is used for inputting, and the pull-ring aluminum cover is subjected to deep drawing forming; the whole equipment adopts a vertical multi-station turntable structure, so that the production efficiency of the pull ring aluminum cover deep drawing forming stage can be greatly improved; the cost of the equipment is lower, and the universality is wide, so that the method is applicable to the production of pull ring aluminum caps (iron caps) and common aluminum caps (iron caps) and crown caps.

The foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the present invention in any way or in any way, and all technical solutions according to the present invention are within the scope of the present invention, and any equivalent changes and modifications made to the above-described embodiment according to the present invention should be considered as the scope of the present invention.

Claims

1. A vertical carousel structure multistation pull ring lid former, its characterized in that: the multi-station turntable type vertical structure comprises a main shaft, wherein the lower part of the main shaft is fixed on a table panel through a first bearing and a bearing base, and the upper end of the main shaft is fixed on the table panel through a second bearing, a flange seat, a fixing frame and an upright post; the main driving motor of the equipment drives the main shaft to rotate through a synchronous pulley at the lower end of the main shaft, and drives a front working procedure shaft system and a rear working procedure shaft system which work cooperatively with the equipment to rotate through gears; the upper die rotating disc is fixedly connected with the main shaft through a flat key and a nut to form a whole, and revolves around the axis along with the main shaft;

A plurality of die positions are uniformly distributed along the circumferential direction of the main shaft, each die position is provided with a set of stamping forming die, each set of stamping forming die comprises a lower die assembly, an upper die assembly and a material pressing piston, the lower die assemblies are uniformly distributed on the lower die turntable, the material pressing pistons are uniformly distributed on the upper die turntable, and the upper die assemblies are uniformly distributed on the upper disc; the lower die turntable and the upper die assembly respectively carry the lower die assembly and the upper die assembly to revolve around the axis along with the main shaft, meanwhile, the lower die assembly moves up and down under the combined action of the lower die cam and the sector cam, and the upper die assembly moves up and down under the combined action of the upper end face cam and the cylindrical cam.

2. The vertical turntable structured multi-station tab cover molding apparatus of claim 1, wherein: on the lower die turntable, the lower die assembly of each die position moves along the axis direction of the main shaft while revolving along the axis of the main shaft, a lower die cam is arranged to push the lower die assembly to ascend, and a sector cam is arranged to be matched with the track surface design of the lower die cam; the lower die cam is matched with the sector cam, so that all lifting actions of the lower die assembly are completed within a circle.

3. The vertical turntable structured multi-station tab cover molding apparatus of claim 1, wherein: the material pressing piston of each die position is aligned with the lower die assembly below in the circumferential direction on the upper die turntable; a first spring is arranged above each material pressing piston, the first spring and the material pressing pistons are fixed on the upper die rotating disc through a screw sleeve above the first spring, and the material pressing pistons slide up and down in the upper die rotating disc;

4. A vertical turntable structured multi-station tab cover forming apparatus as claimed in claim 3, wherein: the upper die assembly is provided with a punch which is fixed at the lower part of the punch rod, and a bearing six is arranged at the upper part of the punch rod through a transverse shaft; a bearing five is arranged and fixed at one end of the transverse shaft, and an upper die guide rod is arranged and fixed at the other end of the transverse shaft; compressed air is blown to the lower end face of the punch through the central hole of the punch and the central through hole of the punch by the pneumatic element at the upper part of the punch, and the air distribution disc above the main shaft controls the on-off of the compressed air flow.

5. The vertical turntable structure multi-station tab cover molding apparatus of claim 4, wherein: the upper die is fixedly connected with the mandrel and the upper die seat; the guide shaft penetrates through the bearing III; the positioning shaft is of a hollow structure, the lower end of the positioning shaft is inserted into a top center hole of the mandrel, and the positioning shaft is positioned with the mandrel by a guide ring; a third spring is arranged outside the positioning shaft, the upper part of the third spring supports a connector of the top cover plug and the positioning shaft, and the lower part of the third spring is supported on the upper end surface of the mandrel; when the upper part is pressed, the connecting body of the top cover plug and the positioning shaft slides downwards in the central hole of the upper part of the mandrel; after the pressure disappears, under the action of the spring III, the connection body between the top cover plug and the positioning shaft rises along with the pressure; the air passage on the side surface of the mandrel is used for controlling the adsorption or blowing-off action of the top cover plug top to the upper sheet material; the lower die assembly is integrally supported on the top surface of the lower die cam by a bearing III at the lower part, and can ascend along with the top surface of the cam of the lower die cam while revolving around the main shaft; in a certain angle interval around the axis of the main shaft, a sector cam is arranged, and in the area needing to descend, the lower die assembly is pulled to a lower position through the sector cam and the roller; under the combined action of the bearing III, the lower die cam, the roller and the sector cam in the lower die assembly, the lower die assembly can ascend and descend along the axial center direction of the main shaft while revolving around the main shaft; the actions of feeding sheets, deep drawing and discharging covers in each rotation range of the main shaft are realized, and the air distribution disc above the main shaft controls the on-off of compressed air flow; the lower die guide rod is matched with the lower die turntable, so that the lower die assembly can maintain the correct direction while revolving, and the rotation phenomenon can not be generated when revolving around the main shaft around the axis of the lower die assembly.

6. The vertical turntable structured multi-station tab cover molding apparatus of claim 5, wherein: the punch is positioned at the center of the pressing piston, the middle part of the punch rod is matched with the hole of the upper disc, and the matching of the upper die guide rod and the corresponding hole of the upper disc ensures that the upper die assembly maintains a correct direction and cannot rotate around the axis of the upper die assembly while revolving around the main shaft; the upper die assembly revolves around the main shaft and simultaneously realizes lifting action of the upper die assembly along the axial direction of the main shaft through the cooperation of the bearing five and the cylindrical cam; in the range of an angle interval for drawing the sheet by matching the punch with the lower die, an upper end cam is arranged below the fixing frame, and the punch is ensured to have larger punching drawing force required by drawing the sheet between the punch and the lower die through the upper end cam, the bearing six and the punch rod.

7. The vertical turntable structured multi-station tab cover molding apparatus of claim 2, wherein: the overlooking section of the lower die cam is in a complete ring shape, and a lower die cam track is arranged, and faces upwards and props against the bottom of the lower die assembly, so that the running height of the lower die assembly when the lower die assembly revolves around the main shaft is limited; the sector cam is in an annular shape with a top view section slightly larger than one quarter, and the installation position of the sector cam is matched with the circumference of the lower die cam; along the circumference of the lower die cam, the track surface height of the lower die cam track is lower in the area without the sector cam distribution and higher in the area with the sector cam distribution; when the lower die assembly moves to an area with sector cams distributed, the lower edge of one side of each sector cam is in contact with the roller of the lower die assembly, and the height of the lower die assembly is controlled; when the lower die assembly revolves around the main shaft, the lower die assembly moves downwards when moving to the area without the distribution of the sector cams and moves upwards when moving to the area with the distribution of the sector cams under the combined action of the sector cams and the lower die cams.

8. The vertical turntable structure multi-station tab cover molding apparatus of claim 4, wherein: the cylindrical cam is in a complete ring shape in top view section, an upper die cam track is arranged, the upper die cam track is 匚 -shaped, a bearing five on one side of the top of the upper die assembly is embedded in the upper die cam track, and the running height of the upper die assembly when the upper die assembly revolves around the main shaft is limited; the top-view section of the upper end face cam is a ring shape with a slightly larger than one quarter, and the installation position of the upper end face cam is matched with the circumference of the cylindrical cam; along the circumference of the cylindrical cam, the track surface height of the upper die cam track is higher in the area without the distribution of the upper end face cams and is lower in the area with the distribution of the upper end face cams; when the upper die assembly moves to an area with upper end face cams distributed, the bottom of the upper end face cams is contacted with the top of the upper die assembly; when the upper die assembly revolves around the main shaft, the upper die assembly moves upwards when moving to a region without the distribution of the upper end face cams under the combined action of the upper end face cams and the cylindrical cams, and moves downwards when moving to a region with the distribution of the upper end face cams.

9. The tab cover forming process based on the vertical turntable structure multi-station tab cover forming equipment of claim 6 comprises the following steps:

Step S1: the special-shaped sheet material with the scribed line punched on the surface is fed at a sheet feeding point of the multi-station pull ring cover forming equipment of the vertical turntable structure;

step S2: the lower die assembly which adsorbs the sheet material revolves and is jacked up by the track surface of the lower die cam;

Step S3: the lower die assembly which adsorbs the sheet continuously ascends while revolving, and the interaction of the lower die assembly and the pressing piston carries out pre-bending treatment on the special-shaped sheet;

Step S4: the upper die assembly descends to stretch the special-shaped sheet, and most of the special-shaped sheet is pulled into the lower die except the ear part of the special-shaped sheet;

step S5: the lower die assembly descends to separate the lower die from the matched conical surface of the pressing piston; the punch and the lower die assembly synchronously descend while the lower die assembly descends;

Step S6: the lower die assembly descends to the next highest position and is maintained, and the upper die assembly continues to descend to the lowest position of the punch head, so that the drawing of the aluminum cap of the pull ring is completed;

step S7: the lower die assembly and the upper die assembly synchronously ascend until the lower die pushes the pressing piston to a proper high position, and the formed pull ring aluminum cover is shaped;

step S8: the upper die assembly, the lower die assembly and the formed pull ring aluminum cover synchronously descend until the lower die and the pressing piston are separated from contact, and the upper die assembly stops descending and keeps the height;

step S9: the lower die assembly continues to move downwards, and the top surface of the top cover plug keeps the adsorption effect on the formed pull ring aluminum cover in the process;

Step S10: the upper die assembly moves upwards to the highest position, the lower die assembly adsorbs the formed pull ring aluminum cover to move downwards to the height of the cover, the equipment is output at the position of the cover outlet position, and then the lower die assembly continues to move downwards to the lowest position to wait for the next working cycle.

10. The pull ring cover forming process according to claim 9, wherein: the steps S1-S10 are specifically as follows:

Step S1: the special-shaped sheet materials with the scribed lines punched on the surface are stacked and separated by a sheet separating mechanism at a sheet feeding point, and a sheet material is placed above each lower die assembly along with the rotation of the main shaft; the direction of the sheet falling is the same as the special-shaped outline in the positioning sleeve at the top of the lower die; after the sheet falls, the sheet is absorbed by a top cover plug in the lower die assembly while being positioned by a positioning sleeve;

Step S3: the lower die assembly which adsorbs the sheet continuously ascends while revolving, and the top conical surface of the lower die interacts with the conical surface of the lower end surface of the pressing piston to extrude the special-shaped sheet into a shallow conical disc-shaped structure; at the moment, the lower die assembly is lifted to the highest point position under the action of the lower die cam and is kept at a high position;

Step S5: the lower die assembly descends under the action of the sector cam, so that the lower die is separated from the matched conical surface of the pressing piston; the punch and the lower die assembly synchronously descend while the lower die assembly descends;

Step S6: the lower die assembly descends to the next highest position and is maintained, the upper die assembly and the punch continue to descend to the lowest position of the punch under the combined action of the upper end face cam and the cylindrical cam, and the drawing of the aluminum cap of the pull ring is completed; in the drawing process, the upper conical surface of the lower die is not contacted with the lower conical surface of the pressing piston, and the pressing piston has no pressing force on the sheet;

Step S7: the lower die assembly and the upper die assembly synchronously ascend until the lower die pushes the material pressing piston to a proper high position, so that the material pressing force is again generated between the upper conical surface of the lower die and the lower conical surface of the material pressing piston; in this state, shaping the already formed aluminum tab cap by using the outer cylindrical surface of the punch, the central inner cylindrical hole of the lower die, the upper conical surface of the lower die and the lower conical surface of the swage piston to eliminate wrinkles generated at the cap body or tab ear part in the previous process;

step S8: the upper die assembly and the lower die assembly together with the formed pull ring aluminum cover synchronously descend until the top conical surface of the lower die and the lower conical surface of the pressing piston are separated from contact, and the upper die assembly stops descending and keeps the height;

Step S9: the lower die assembly continues to descend, and in the descending process of the lower die assembly, the top surface of the top cover plug always keeps the adsorption effect on the aluminum cover surface part by utilizing negative pressure air, so that the aluminum cover cannot be thrown out of the turntable under the action of centrifugal force in the revolution process of the turntable;

Step S10: when the lower die assembly descends to a certain height and the top cover plug and the lower die simultaneously descend, the upper die assembly starts to ascend to the highest position under the action of the cylindrical cam and waits for the next working cycle; the lower die assembly adsorbs the formed aluminum tab cover to descend to the height of the cover, and the formed aluminum tab cover is output from the device at the position of the cover outlet point and is transferred to the next forming process; subsequently, the lower die assembly continues to descend to the lowest position, waiting for the next work cycle, ready to adsorb the profiled sheet input for the next work cycle.