CN111702096A

CN111702096A - Forming equipment and forming process of threaded tank body

Info

Publication number: CN111702096A
Application number: CN202010603674.6A
Authority: CN
Inventors: 吴秀毅; 余立; 唐昱
Original assignee: Zhejiang Longwen Precision Equipment Co ltd
Current assignee: Zhejiang Longwen Precision Equipment Co ltd
Priority date: 2020-06-29
Filing date: 2020-06-29
Publication date: 2020-09-25

Abstract

The invention discloses a forming device and a forming process of a threaded tank body. The outer die driven by the driving mechanism is close to the tank body and applies pressure, the outer die and the inner die of the edge folding device are synchronously rolled, so that a sharp-angled edge is formed at the upper end of the tank body, after the tank body is curled by the edge curling device, the section is positioned in the contact part of the curled edge and the tank body and an ideal shape is obtained, the outer die and the inner die of the edge tightening device are matched to tightly press the curled edge, the inside of the curled edge is in a sealed state, water vapor cannot enter the curled edge, and the section in the curled edge cannot rust.

Description

Forming equipment and forming process of threaded tank body

Technical Field

The invention relates to the technical field of metal container manufacturing, in particular to a forming device and a forming process of a threaded tank body.

Background

The iron can is also called three-piece can in the industry, and after steel plates are delivered as can steel plates through a surface treatment process, the can steel plates are further subjected to coating and blanking processing and then are welded by a welding machine; then, the repair coating at the welding part is heated and dried, and is subjected to necking, flanging and bottom cover mounting procedures to form a product; further, after filling the contents and attaching a lid, heat sterilization is performed by retort treatment.

Threaded iron can containers currently on the market are made of metal as a main body, have excellent light-shielding properties and air-permeability resistance for contents, are easy to transport by reclosure, and are lighter than glass bottles, and therefore are highly evaluated and are on the market in large quantities.

The screw thread can material made of iron is tinplate, and after the steel plate is cut, the section of the steel plate is easy to rust, so that the section of the upper port needs to be processed, at present, the upper port of the can body is curled, so that the section easy to rust is not contacted with the outside, and after the curling is finished, as the curling edge possibly has a gap with the outer wall of the can body, in the cooking, heating and sterilizing process or in humid air, water vapor enters the inside of the curling edge, so that the section is rusted, and the quality of the can body is further influenced.

Disclosure of Invention

The invention provides a forming device and a forming process of a threaded can body, aiming at solving the problem that a gap possibly exists between a turned edge and the outer wall of the can body, and moisture enters the turned edge to generate a rusting phenomenon.

The technical scheme adopted by the invention is as follows:

the forming equipment of the threaded tank body comprises a flanging device used for enabling the upper end of the tank body to form a flanging, a curling device used for enabling the upper end of the tank body to form the curling and a curling device used for pressing the curling, wherein the flanging device and the curling device are both provided with an outer mold support and a rolling shaft, the outer mold support is provided with the outer mold shaft, the outer mold is installed on the outer mold shaft through a bearing, the rolling shaft is connected with a power device through a transmission mechanism, the rolling shaft is provided with an inner mold, the outer mold support is provided with a driving mechanism, and the driving mechanism drives the outer mold to change between a position for applying pressure to the tank body and a position for separating from the tank body.

Preferably: the driving mechanism comprises a central shaft, the central shaft is connected with a second power device through a second transmission mechanism, an eccentric shaft is arranged on the central shaft, and the eccentric shaft is an outer die shaft.

Preferably: the second transmission mechanism is a worm gear and a worm, and the worm gear is arranged on the central shaft.

Preferably: the outer die comprises a first outer die arranged on the edge folding device, the inner die comprises a first inner die arranged on the edge folding device, the first inner die is provided with a first inclined surface, the first outer die is provided with a second inclined surface matched with the first inclined surface, and the included angle between the first inclined surface and the vertical direction is 30-60.

Preferably: the outer die further comprises a second outer die arranged on the edge tightening device, and the second outer die is provided with an arc surface matched with the tank body curled edge and a supporting surface used for supporting the bottom of the curled edge.

Preferably: the second outer die comprises a first outer die and a second outer die, the supporting surface comprises a first supporting surface arranged on the first outer die and a second supporting surface arranged on the second outer die, and the length of the first supporting surface is larger than that of the second supporting surface.

Preferably: the tank body curling device is provided with a rotating shaft and a curling die, the rotating shaft is connected with a third power device through a third transmission mechanism, the rotating shaft is connected with a lifting mechanism, a die seat is installed on the rotating shaft, the curling die is obliquely installed on the die seat through a bearing, and a curling groove is formed in the curling die.

Preferably: the inclination angle of the hemming die to the horizontal is 30 degrees.

The forming process of the threaded can body comprises a curling process, wherein an edge tightening process is arranged after the curling process, and the edge tightening process compresses a curled edge and limits the upper and lower width of the curled edge.

Preferably: and a flanging procedure is arranged before the curling procedure, and the flanging procedure enables the upper end of the tank body to form a sharp-angled flanging.

Preferably: the method further comprises a pre-flanging process for pre-flanging the bottom end of the tank body, wherein the edge-curling process and the pre-flanging process are carried out simultaneously.

Preferably: the method sequentially comprises a straight process, a necking process, a flanging process, a curling and pre-flanging process, an expansion tank process, a thread forming process, a tightening process, a safety ring process and a flanging process.

Preferably: the necking step includes a primary necking step, a secondary necking step, and a tertiary necking step.

Preferably: the safety loop process comprises a first safety loop process and a second safety loop process.

The invention has the beneficial effects that:

the outer die driven by the driving mechanism is close to the tank body and is pressed, the outer die can rotate to reduce the friction force between the outer die and the tank surface and reduce the scratch of the tank surface, the outer die and the inner die of the edge folding device are synchronously rolled to enable the sharp corner edge to be formed at the upper end of the tank body, after the edge is folded by the edge folding device, the section is ensured to be positioned in the contact part of the folded edge and the tank body and to obtain an ideal shape, the outer die and the inner die of the edge tightening device are matched to tightly press the folded edge, the interior of the folded edge is in a sealed state, water vapor cannot enter the folded edge, and.

Drawings

FIG. 1 is a schematic representation of the process of the present invention.

FIG. 2 is a schematic cross-sectional view of a formed can body of the present invention.

FIG. 3 is a schematic view of the can body hemming apparatus of the present invention.

Fig. 4 is a schematic view of the portion 1M of fig. 3 according to the present invention.

Fig. 5 is a schematic view of portion 1N of fig. 3 according to the present invention.

Fig. 6 is an enlarged schematic view at 1A of fig. 3 of the present invention.

Fig. 7 is an enlarged schematic view of the invention at 1B in fig. 6.

Fig. 8 is a schematic view of the can body beading apparatus of the present invention.

Fig. 9 is a schematic view of the 2M portion of fig. 8 in accordance with the present invention.

Fig. 10 is a schematic view of the 2N portion of fig. 8 according to the present invention.

Fig. 11 is an enlarged schematic view at 2A of fig. 8 of the present invention.

Fig. 12 is an enlarged schematic view of the invention at 2B in fig. 8.

Fig. 13 is an enlarged schematic view of the invention at 2C in fig. 12.

Fig. 14 is an enlarged schematic view at 2D of fig. 12 of the present invention.

Fig. 15 is a schematic view of the can body seaming apparatus of the present invention.

Fig. 16 is a schematic view of the 3M portion of fig. 15 in accordance with the present invention.

Fig. 17 is a schematic view of portion 3N of fig. 15 in accordance with the present invention.

Fig. 18 is an enlarged schematic view of the invention at 3A in fig. 15.

Fig. 19 is a schematic view of the hemming die of fig. 15 according to the present invention.

The tank body flanging device comprises a tank body flanging device 1, a first outer mold 101, a first inner mold 102, a first inclined surface 103 and a second inclined surface 104;

the tank body edge tightening device comprises a tank body edge tightening device 2, a second external mold 201, an arc surface 202, a first external mold 203, a second external mold 204, a first edge tightening mold 213, a second edge tightening mold 223, a first positioning mold 204, a second transmission mechanism 205, a first supporting surface 205, a second supporting surface 206 and a second internal mold 207;

the can body crimping device 3, a rotating shaft 301, a crimping die 302, a die seat 303, a crimping groove 304, a pre-crimping die 305 and a positioning die 306.

The device comprises an outer mold support 4, a rolling shaft 5, an outer mold shaft 6, a driving mechanism 7, a central shaft 71 and a second transmission mechanism 72.

Detailed Description

The invention will be further illustrated with reference to the following examples and drawings:

in the embodiment, as shown in fig. 1, 6, 8, 11 and 15, the forming equipment of the threaded can body comprises a flanging device 1 for forming a flanging on the upper end of the can body, a flanging device 3 for forming a flanging on the upper end of the can body and a crimping device 2 for pressing the flanging, wherein the flanging device 1 and the crimping device 2 are respectively provided with an outer die support 4 and a rolling shaft 5, the outer die support 4 is provided with an outer die shaft 6, the outer die is mounted on the outer die shaft 6 through a bearing, the rolling shaft 5 is connected with a first power device through a first transmission mechanism, the rolling shaft 5 is provided with an inner die, the outer die support 4 is provided with a driving mechanism 7, and the driving mechanism 7 drives the outer die to change between a first position for pressing the can body and a second position for separating from the can body. The first power device is a motor, the edge folding device 1 and the edge tightening device 3 both comprise an upper frame, a lower frame, a fixed seat and a main shaft, the main shaft is arranged on the fixed seat, a first gear is arranged on the fixed seat, the upper frame is connected with the lower frame, the first gear is connected with the lower frame and is driven by the motor, a first transmission mechanism comprises a second gear arranged on the main shaft and a second gear arranged on a rolling shaft 5, when the upper frame rotates on the main shaft in the circumferential direction, the second gear is matched with the third gear to realize the rotation of the rolling shaft 5, a transition gear can be arranged between the second gear and the third gear to adjust the rotating speed of the rolling shaft 5, an outer mold driven by a driving mechanism 7 is close to a tank body and applies pressure, the outer mold can rotate, the friction force between the outer mold and the tank surface is reduced, the scratch of the tank surface is reduced, the outer mold and the inner mold of the, the sharp corner formed at the upper end of the tank body is folded, after the tank body is curled by the curling device 3, the section is ensured to be positioned in the contact part of the curled edge and the tank body, and an ideal shape is obtained, the outer die of the curling device 2 is matched with the inner die to tightly press the curled edge, so that the inside of the curled edge is in a sealed state, water vapor cannot enter the curled edge, and the section in the curled edge cannot rust.

In an embodiment, as shown in fig. 6 and 11, the driving mechanism 7 includes a central shaft 71, the central shaft 71 is connected to a second power device through a second transmission mechanism 72, the central shaft 71 is provided with an eccentric shaft, and the eccentric shaft is the outer mold shaft 6; the second transmission mechanism 72 is a worm gear, and the worm gear is arranged on the central shaft 71. The outer die shaft 6 is eccentrically arranged on the central shaft 71, the distance between the outer die and the tank body is adjusted by rotating the central shaft 71, and the structure is simple; the second power device is a motor, the motor drives a worm to rotate, the worm wheel drives the central shaft 71 to rotate, the worm wheel and the worm are matched with the transmission to be stable and have a self-locking function, when the outer mold acts on the tank body, the central shaft 71 cannot rotate, and meanwhile, the distance between the outer mold and the inner mold can be accurately adjusted to obtain an ideal product appearance.

In the embodiment, as shown in fig. 3, 4, 5, 6 and 7, the outer die comprises a first outer die 101 mounted on the edge folding device 1, the inner die comprises a first inner die 102 mounted on the edge folding device, the first inner die 102 is provided with a first inclined surface 103, the first outer die 101 is provided with a second inclined surface 104 matched with the first inclined surface 103, and an included angle between the first inclined surface 103 and the vertical direction is 30-60 °. The optimal angle of the included angle between the first inclined plane 8 and the vertical direction is 45 degrees, the curling after bending is convenient, the first outer die 101 is matched with the first inner die 102, the upper port of the can body is formed into a sharp-angled folded edge, the folded edge can be bent around the sharp-angled point during curling, and the precision of the can body can be guaranteed.

In an embodiment, as shown in fig. 8, 9, 10, 11, 12, 13 and 14, the outer die further comprises a second outer die 201 mounted on the edge tightening device 2, and the second outer die 201 is provided with an arc surface 202 for matching with the can body curled edge and a supporting surface for supporting the bottom of the curled edge; the length of the supporting surface is larger than the radius of the turned edge in the horizontal direction. The supporting surface can prevent the section from extending downwards, so that the width of the curled edge in the up-and-down direction is controlled, and the width of the curled edge in the up-and-down direction is ensured to be within a set value after the curled edge is compressed.

In an embodiment, as shown in fig. 8, 9, 10, 11, 12, 13, and 14, the inner mold includes a second inner mold 207 mounted on the edge tightening device 2, the second inner mold 207 functions to position the can body, and the rolling shaft 5 can drive the second inner mold 207 to rotate circumferentially, so as to reduce the friction between the second inner mold 207 and the can body, and improve the edge tightening effect.

In an embodiment, as shown in fig. 8, 9, 10, 11, 12, 13 and 14, the No. two outer dies 201 comprise a first outer die 203 and a second outer die 204, the support surfaces comprise a No. one support surface 205 arranged on the first outer die 203 and a No. two support surface 206 arranged on the second outer die 204, and the length of the No. one support surface 205 is greater than that of the No. two support surface 206. The curled edge can be compressed twice, the first external die 203 is adopted for primarily compressing the curled edge for the first time and ensuring that the front end of the curled edge is inclined upwards gradually, the second external die 204 is adopted for compressing the curled edge for the second time, so that the curled edge is not in clearance with the outer wall of the tank body, the supporting surface limits the upper and lower width of the curled edge and ensures that the section is pressed into the curled edge.

In an embodiment, as shown in fig. 15, 16, 17, 18, and 19, the can body curling device 3 includes a rotating shaft 301 and a curling die 302, the rotating shaft 301 is connected to a third power device through a third transmission mechanism, the rotating shaft 301 is connected to a lifting mechanism, the rotating shaft 301 is provided with a die holder 303, the curling die 302 is obliquely installed on the die holder 303 through a bearing, and the curling die 302 is provided with a curling groove 304. The die holder 303 is provided with a positioning die 306 matched with the inner wall of the tank body, the third power device is a motor, the tank body curling device 3 also comprises an upper frame, a lower frame, a fixed seat and a main shaft arranged on the fixed seat, the upper frame is connected with the lower frame through a key, the rotating shaft 301 is arranged on the upper frame, the fixed seat is provided with a third gear, the third gear is connected with the lower frame, the third transmission mechanism comprises a first gear arranged on the rotating shaft 301 and a second gear arranged on the main shaft, the second gear drives the third gear to rotate for an internal gear motor, meanwhile, the lower frame rotates with the upper frame, the rotating shaft 301 is arranged on the upper frame, the first gear is meshed with the internal gear to drive the rotating shaft 301 to rotate, the lifting mechanism comprises a cam groove arranged on the main shaft, the rotating shaft 301 is provided with a roller matched with the cam groove, and, the rotating shaft 301 drives the curling die 302 to rotate and descend, so that the curling groove 304 is matched with the top surface of the can body and moves circumferentially on the top surface of the can body, the top of the can body is curled, the contact between the curling groove 304 and the top surface of the can body is rolling friction, the friction force is reduced, the curling die 302 is obliquely arranged on the die seat 303 to curl, the curling mode is similar to die pressing curling, the axial force is greatly reduced, the requirement on the axial bearing capacity of the can body is lowered, the can body is not subjected to the axial force of curling, various attractive appearances can be made, meanwhile, the rotary curling is not easy to cause the defects of scratching and the like of the can body, and the curling is performed step by step through different curling grooves, so that the curling with smoother and better quality is obtained; the can body curling device 3 is also provided with a pre-curling die 305 matched with the bottom of the can body, the pre-curling die 305 is also provided with a lifting mechanism, the lifting mechanism of the pre-curling die 305 is the same as the lifting mechanism of the rotating shaft 301, the bottom of the can body is pre-curled while curling, and the processing procedure of forming the can body is reduced.

In an embodiment, as shown in fig. 15, 16, 17, 18, and 19, the angle of inclination of the hemming die 302 to the horizontal is 30 °. The optimal inclination angle of the hemming die 302 is 30 degrees, the hemming die 302 is arranged obliquely, so that the axial stress of the can body can be reduced, the shape interference is reduced, and the can body cannot be crushed in the descending process of the hemming die 302.

In the embodiment, as shown in fig. 1 and 2, the main process of the forming process of the threaded can body is as follows:

the method sequentially comprises a straight process, a primary necking process, a secondary necking process, a tertiary necking process, a flanging process, a pre-rolling and pre-flanging process, a curling (forming) and pre-flanging process, a can expanding process, a thread forming process, a tightening process, a first safety ring process, a second safety ring process and a flanging process. The necking procedure can be added according to the specific can manufacturing requirement, the curling procedure is divided into two procedures, the axial force borne by the can body in each procedure is greatly reduced, the rigidity requirement of the can body is reduced, the can body is allowed to have various shapes, and the special-shaped can becomes possible.

Other forming processes can be processed and realized by the existing can making technology.

It should be understood that the above-described embodiments of the present invention are merely examples for illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. There is no need or no way to give poor examples of all embodiments. And such obvious changes and modifications which are within the spirit of the invention are deemed to be covered by the present invention.

Claims

1. The former of the screw thread jar body, its characterized in that: the flanging device comprises a flanging device (1) for enabling the upper end of a tank body to form a flanging, a flanging device (3) for enabling the upper end of the tank body to form the flanging and a flanging device (2) for compressing the flanging, wherein the flanging device (1) and the flanging device (3) are respectively provided with an outer mold support (4) and a rolling shaft (5), the outer mold support (4) is provided with an outer mold shaft (6), the outer mold is installed on the outer mold shaft (6) through a bearing, the rolling shaft (5) is connected with a power device through a transmission mechanism, the rolling shaft (5) is provided with an inner mold, the outer mold support (4) is provided with a driving mechanism (7), and the driving mechanism (7) drives the outer mold to change between a first position for applying pressure to the tank body and a second position for separating from the tank body.

2. A threaded can body forming apparatus as claimed in claim 1, wherein: the driving mechanism (7) comprises a central shaft (71), the central shaft (71) is connected with a second power device through a second transmission mechanism (72), the central shaft (71) is provided with an eccentric shaft, and the eccentric shaft is an outer mold shaft (6).

3. A threaded can body forming apparatus as claimed in claim 1, wherein: the second transmission mechanism (72) is a worm gear, and the worm gear is arranged on the central shaft (71).

4. A threaded can body forming apparatus as claimed in claim 1, wherein: the outer die comprises a first outer die (101) installed on the edge folding device (1), the inner die comprises a first inner die (102) installed on the edge folding device, a first inclined plane (103) is arranged on the first inner die (102), a second inclined plane (104) matched with the first inclined plane (103) is arranged on the first outer die (101), and an included angle formed between the first inclined plane (103) and the vertical direction is 30-60 degrees.

5. A threaded can body forming apparatus as claimed in claim 1, wherein: the outer die further comprises a second outer die (201) installed on the edge tightening device (2), and the second outer die (201) is provided with an arc surface (202) used for being matched with the tank body edge curling and a supporting surface used for supporting the bottom of the edge curling.

6. A threaded can body forming apparatus as claimed in claim 1, wherein: the second outer die (201) comprises a first outer die (203) and a second outer die (204), the supporting surfaces comprise a first supporting surface (205) arranged on the first outer die (203) and a second supporting surface (206) arranged on the second outer die (204), and the length of the first supporting surface (205) is greater than that of the second supporting surface (206).

7. A threaded can body forming apparatus as claimed in claim 1, wherein: jar body crimping device (3) are equipped with pivot (301) and crimping mould (302), pivot (301) are connected with No. three power device through No. three drive mechanism, pivot (301) are connected with elevating system, mould seat (303) are installed in pivot (301), crimping mould (302) are installed on mould seat (303) through the bearing slope, be equipped with crimping groove (304) on crimping mould (302).

8. The forming process of the threaded can body comprises a curling process and is characterized in that: and an edge tightening process is arranged after the edge curling process, and the edge tightening process compresses the edge curling and limits the upper and lower width of the edge curling.

9. A process of forming a threaded can body according to claim 8, wherein: and a flanging procedure is arranged before the curling procedure, and the flanging procedure enables the upper end of the tank body to form a sharp-angled flanging.

10. A process for forming a threaded can body according to claim 8, characterized by the following steps: the method sequentially comprises a straight process, a necking process, a flanging process, a curling and pre-flanging process, an expansion tank process, a thread forming process, a tightening process, a safety ring process and a flanging process.