Can manufacturing method and manufacturing system

Abstract

To provide a can manufacturing method and can manufacturing system that enable cans to be delivered inexpensively and with short delivery time.SOLUTION: In a can manufacturing method in which cans are manufactured by deep drawing using a pressing machine, there are equipped a front-step pressing machine, a latter-step pressing machine, and transportation means transporting blanks from the front-step pressing machine to the latter-step pressing machine, the can manufacturing method includes: a first pressing step in which the front-step pressing machine is used to perform blanking work and coining work to reduce the thickness of the blanks on the metal sheet; a transportation step of transporting the blanks from the front-step pressing machine to the latter-step pressing machine; and a second pressing step in which the latter-step pressing machine is used to form square cans by drawing and / or squeezing.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a method for producing cans by deep drawing and to a production system for deep drawing cans. [Background technology]

[0002] Conventionally, in deep drawing of cans, it is common to use a single press machine to perform multiple processes, such as blanking, which punches out a blank from sheet metal, and drawing, which forms a cylindrical cup with a bottom (see Patent Documents 1 and 2). Generally, the one press machine is dedicated to a specific type and size of product. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-23942 [Patent Document 2] JP 2003-275833 A Summary of the Invention [Problem to be solved by the invention]

[0004] There are multiple types of press machines available according to the type and size of cans, and dedicated press machines are designed and manufactured based on these models to suit the manufacturing methods of can manufacturers, but since it is not always possible to set the specifications in detail to match the manufacturing methods of can manufacturers, there are cases where the specifications are over-specified. Furthermore, since it is a dedicated press machine, it is difficult to repurpose it to manufacture other products, which has been a factor in increasing costs in can manufacturing. In addition, designing and manufacturing a dedicated press takes a considerable amount of time, which has the drawback of lengthening delivery times.

[0005] Therefore, an object of the present invention is to provide a can manufacturing method and system that can supply cans at low cost and in a short delivery time. [Means for solving the problem]

[0006] The method for producing a can by deep drawing with a press of the present invention comprises the steps of: A front-end press machine, a rear-end press machine, and a conveying means for conveying a blank from the front-end press machine to the rear-end press machine, A first pressing process in which blanking and coining are performed on the metal plate by the front-stage press machine to reduce the thickness of the blank; a conveying step of conveying a blank from the front-end press machine to the rear-end press machine; and a second press process in which the post-process press machine performs drawing and / or drawing and ironing to form a rectangular can, the front-end press machine includes fingers for transporting the blank formed by the blank processing, The first press step includes a step of performing the blanking process prior to the coining process, and finger-transporting the blank formed by the blanking process in the front-stage press machine, The blank has a flat shape, and the fingers grip the blank by pinching it from both sides in the longitudinal direction. Then, the blank is transported in the minor axis direction. The present invention is characterized by the above. In addition, the method for producing a can by deep drawing with a press of the present invention includes the steps of: A front-end press machine, a rear-end press machine, and a conveying means for conveying a blank from the front-end press machine to the rear-end press machine, A first pressing process in which blanking and coining are performed on the metal plate by the front-stage press machine to reduce the thickness of the blank; a conveying step of conveying a blank from the front-end press machine to the rear-end press machine; and a second press process in which the post-process press machine performs drawing and / or drawing and ironing to form a rectangular can, The post-processing press machine is provided with fingers for transporting a molded product obtained by drawing and / or drawing and ironing the blank, The molded product has a flat shape, and the fingers have contact portions made of a resin material or a rubber material, and the contact portions grip the molded product by pinching it from both sides in the longitudinal direction. , in the minor axis direction of the molded product The present invention is characterized by the fact that it transports

[0007] In addition, the present invention relates to a system for manufacturing cans by deep drawing with a press, A front-end press machine, a rear-end press machine, and a conveying means for conveying a blank from the front-end press machine to the rear-end press machine, The front-end press machine is configured to perform blanking and coining for reducing the thickness of the blank on the metal plate, The post-process press is configured to form a rectangular can by performing drawing and / or drawing and ironing, The front-end press machine is configured to perform the blanking process prior to the coining process, and has fingers that transport the blank formed by the blanking process within the front-end press machine; The blank has a flat shape, and the fingers grip the blank by pinching it from both sides in the longitudinal direction. Then, the blank is transported in the minor axis direction. The present invention is characterized by the above. In addition, the present invention relates to a system for manufacturing cans by deep drawing with a press, A front-end press machine, a rear-end press machine, and a conveying means for conveying a blank from the front-end press machine to the rear-end press machine, The front-end press machine is configured to perform blanking and coining for reducing the thickness of the blank on the metal plate, The post-process press is configured to form a rectangular can by performing drawing and / or drawing and ironing, The post-processing press machine is provided with fingers for transporting a molded product obtained by drawing and / or drawing and ironing the blank, The molded product has a flat shape, and the contact portions of the fingers with the molded product are made of a resin material or a rubber material, and the molded product is gripped by being sandwiched from both sides in the longitudinal direction. Then, the molded product is transported in the minor axis direction. The present invention is characterized by the above. Effect of the Invention

[0008] With the above-described configuration, the present invention makes it possible to construct a manufacturing system that is optimal for the product and size to be processed and its processing process, and further, it can be provided at low cost and can be designed and manufactured in a short period of time. In addition, by using a general-purpose press, it is relatively easy to respond even when there are changes in the type or size of the product being processed. [Brief description of the drawings]

[0009] [Figure 1] 4A to 4C are diagrams illustrating a molding process for the cell case of the present embodiment. [Diagram 2] FIG. 1 is an explanatory side view of a manufacturing system 1 according to an embodiment of the present invention. [Diagram 3] FIG. 1 is a top view illustrating a manufacturing system 1 according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the following description, the same reference numerals in different drawings indicate parts having the same function, and duplicated descriptions in each drawing will be omitted as appropriate. Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0011] [Embodiment] Hereinafter, an embodiment of a method for manufacturing a can by deep drawing with a press, for example a rectangular can such as a cell case for a battery such as a lithium ion battery, and a manufacturing system used in the manufacturing method of the present invention will be described with reference to the drawings. An embodiment of the present invention (hereinafter referred to as "the present embodiment") is a manufacturing method and manufacturing system for manufacturing a cell case for a lithium ion battery having a rectangular opening.

[0012] [Manufacturing process] FIG. 1 is a diagram showing a molding process for the cell case of this embodiment. The manufacturing process of the cell casing in this embodiment will be described with reference to FIG. (1) The uncoiler is a device that unwinds the aluminum sheet S that has been wound into a coil shape, and supplies the unwound aluminum sheet S to the front-end press machine 2. (2) The first pressing step is carried out in the front-end press machine 2. The first pressing step is a step in which blanking is carried out in the order of a blanking step and a coining step. (3) The blanking process is a process in which blanks B having flat shapes such as oval shapes or compound R shapes are punched out from the aluminum sheet S unwound from the uncoiler in order to manufacture cans by deep drawing. After the blanking process, the blank B is conveyed by fingers to the next coining process. (4) The coining process is a process in which a portion of the blank B is crushed with a punch to reduce the plate thickness, and in this embodiment, this is a process in which the portion that will become the bottom of the can in the final shape and / or its vicinity is coined to reduce the plate thickness. After the coining process, a process is performed in which the blank B is finger-transported to a blank transport device 4. (5) The process includes a conveying process in which blanking and coining are performed in the front-end press machine 2, and then the blank B is conveyed by the blank conveying device 4 to the rear-end press machine 3 for processing. (6) Post-processing: A second pressing process is carried out in the press machine 3. The second pressing process is a process in which the blank B is processed into a final cup shape through a plurality of forming processes. (7) The multiple forming process includes a first forming process in which the cup C is drawn into a flat shape such as an ellipse or a compound R shape, and a final forming process in which the cup C is drawn to the long and short side dimensions of the final product. After each process, the cup C is transferred to the next process, i.e., a cup transfer device 5. In addition, a necessary forming process may be added between the first forming process and the final forming process. In each forming process, drawing or drawing and ironing can be appropriately selected. (8) Post-Process The press machine 3 performs other molding processes, and then the cup C (rectangular can) is conveyed by the cup conveying device 5 to a post-press processing process. (9) After pressing, if necessary, there may be a cleaning process to remove lubricating oil and foreign matter adhering to the square cans, and an inspection and packaging process to inspect the appearance of the completed square cans using a camera or other device and package only those that pass the inspection.

[0013] Among the above processes, the blanking process, the coining process, and each forming process are carried out using a press. Among the processes performed using a press machine, the press machines used in the blanking process and the coining process require a short stroke but a high pressure application capacity, whereas the press machines used in each forming process in which drawing or drawing and ironing is performed require a long stroke but a low pressure application capacity.

[0014] Therefore, the blanking process and the coining process are performed using the same press machine, and a general-purpose press machine with a short stroke and high pressure capacity is selected as the front-end press machine 2, and each forming process is performed using the same press machine, and a general-purpose press machine with a long stroke and low pressure capacity is selected as the back-end press machine 3. These front-end press machine 2 and rear-end press machine 3 are connected via a blank conveying device 4, and further combined with a cup conveying device 5 that transports cups C from the rear-end press machine 3, and arranged as a continuous manufacturing system 1 as shown in Figures 2 and 3.

[0015] [Manufacturing System] FIG. 2 is an explanatory side view of the manufacturing system 1 of this embodiment, and FIG. 3 is an explanatory top view. A manufacturing system 1 having a front-end press machine 2, a back-end press machine 3, a blank transport device 4, and a cup transport device 5 of this embodiment will be described with reference to FIGS. 2 and 3. FIG.

[0016] The front-end press machine 2 and the rear-end press machine 3 are so-called general-purpose press machines, with the front-end press machine being selected from general-purpose press machines having two processing stages, and the rear-end press machine being selected from general-purpose press machines having multiple processing stages.

[0017] The front-end process press 2 includes a front-end process stage 21, which includes a blanking process stage 21a and a coining process stage 21b arranged in a line. The front-end processing stage 21 has a punch 221 and a die 231, and the blanking processing stage 21a and the coining processing stage 21b each have a punch 221 and a die 231 that face each other. The two punches 221 are held by a punch holder provided on the slide 22 and aligned in a row at a predetermined interval, and the two dies 231 are held by a die holder provided on the bolster 23 and aligned in a row at a predetermined interval.

[0018] The front-end press machine 2 also has a transfer device 24 that transports the blank B. The transfer device 24 is disposed so as to transport the blank B from the blank processing stage 21a and the coining processing stage 21b to the next coining processing stage 21b and the blank transport device 4, respectively, and moves the blank B to the next coining processing stage 21b and the blank transport device 4 every time the punch 221 moves up and down.

[0019] The post-process press 3 includes a receiving stage 31a, a first forming stage 31b, and a final forming stage 31c arranged in a line as the post-processing stage 31. Any necessary forming stages may be added between the first forming stage 31b and the final forming stage 31c. Of the post-processing stages 31, the first forming stage 31b and the final forming stage 31c each include a punch 321 and a die 331 that face each other. The three punches 321 are held by a punch holder provided on the slide 32 and aligned in a row at a predetermined interval, and the three dies are held by a die holder provided on the bolster 33 and aligned in a row at a predetermined interval. The receiving stage 31a is provided with the terminal end of the blank conveying device 4, with the configuration of the first processing stage that is originally included in a general-purpose press machine removed.

[0020] Further, the post-process press machine 3 has a transfer device 34 that transports the blank B and the cup C. The transfer device 34 is disposed so as to transport the blank B and the cup C from the receiving stage 31a, the 1st forming stage 31b, and the final forming stage 31c to the next 1st forming stage 31b, the final forming stage 31c, and the cup transport device 5, respectively, and moves the blank B and the cup C to the next 1st forming stage 31b, the final forming stage 31c, and the cup transport device 5 every time the punch 321 moves up and down.

[0021] [Transfer device] 3, a pair of fingers 241 are disposed facing each other at the blanking stage 21a and the coining stage 21b as the transfer device 24 provided in the front-end press machine 2. These two pairs of fingers 241 are integrally connected and driven in synchronization with the elevation and lowering of the punch 221. The pair of fingers 241 grips the blank B and moves it to the next coining stage 21b and blank transport device 4.

[0022] Further, as the transfer device 34 provided in the post-process press 3, a pair of fingers 341 is arranged facing each other at the receiving stage 31a, the first forming stage 31b, and the final forming stage 31c. These pairs of fingers 341 are integrally connected and driven in synchronization with the elevation and lowering of the punch 321. The pair of fingers 341 grips the blank B and the cup C and moves them to the next first forming stage 31b, the final forming stage 31c, and the cup conveying device 5.

[0023] The fingers 241 and 341 grip the flat blank B or cup C by sandwiching it from both sides in the longitudinal direction. This makes it possible to shorten the conveyance pitch and to prevent the cup C from being deformed by the gripping force. Of the fingers 241 and 341, the contact parts 2411 and 3411 that come into contact with the blank B and the cup C are made of a material that is unlikely to scratch the aluminum blank B and the cup C, such as a resin material or a rubber material. The blank B and the cup C become hot due to the press working, so the contact parts 2411 and 3411 need to have a certain heat resistance, and also need durability such as abrasion resistance because the blank B and the cup C are repeatedly clamped and released. Taking this into consideration, the material is appropriately selected from polyamideimide, polyacetal, monomer cast nylon, fluororesin, polyether ether ketone, fluororubber, silicone rubber, ethylene propylene rubber, acrylic rubber, and the like. The heat resistance temperature is preferably 100°C or higher, more preferably 150°C or higher.

[0024] [Variations] Although the manufacturing system 1 of this embodiment has been described above, the present invention is not limited to this example, and various modified examples are possible. (1) The manufacturing system 1 of this embodiment is configured with two general-purpose press machines, a front-end press machine 2 and a back-end press machine 3, but is not limited to this and may be configured with three or more general-purpose press machines. In this case, the optimum general-purpose press machines are selected from those with different pressurizing capacities, strokes, number of processing stages, etc. Also, even if the pressing capacity and stroke required for each processing step are approximately the same, if there are many processing stages, instead of using one dedicated press machine, it is possible to configure a manufacturing system by connecting multiple general-purpose press machines.

[0025] (2) In the manufacturing system 1 of this embodiment, a front-end press machine 2 with high pressurizing capacity and a short stroke is combined with a rear-end press machine 3 with low pressurizing capacity and a long stroke, but any other combination may be used.

[0026] (3) In the manufacturing system 1 of this embodiment, the front-end press machine 2 performs blanking and coining, and the back-end press machine 3 performs multiple forming processes. However, the types of processing and the order in which each press machine performs them can be designed appropriately depending on the specific forming process, such as the type, shape, and size of the product to be manufactured. For example, the front-end press machine 2 does not need to include the coining stage 21b, and the blanking stage 21a may only punch out a blank, or may punch out a blank and perform drawing by using a punch. In addition to the first forming stage 31b for drawing and the final forming stage 31c, the post-process press 3 may have as many forming stages as necessary in between. It is also possible to add other necessary processing stages, such as a reforming process, a step processing process, and a lubricating oil application process, at any position.

[0027] (4) Although the manufacturing system 1 of this embodiment processes cell cases of aluminum lithium ion batteries, it is not limited to cell cases and may process any other type of aluminum can. It may also process any type of case or can made of other metals such as stainless steel, or any type of case or can with a laminated structure in which metal is coated with resin or the like.

[0028] (5) The manufacturing system 1 of this embodiment is for producing cans with rectangular openings. In addition, the manufacturing system 1 may be for producing cans with square openings, or cans of other shapes such as circular cans, oval cans, etc.

[0029] [Another embodiment of the invention] (1) In a method for manufacturing cans by deep drawing with a press, A front-end press machine, a rear-end press machine, and a conveying means for conveying a blank from the front-end press machine to the rear-end press machine, A first pressing process in which blanking and coining are performed on the metal plate by the front-stage press machine to reduce the thickness of the blank; a conveying step of conveying a blank from the front-end press machine to the rear-end press machine; and a second press process in which drawing and / or drawing and ironing are performed with the post-process press machine to form a rectangular can. (2) The method for manufacturing a can according to (1) above, characterized in that the stroke of the front-end press machine is shorter than the stroke of the rear-end press machine. (3) The method for manufacturing a can according to (1) or (2) above, wherein the pressing capacity of the front-stage press machine is higher than the pressing capacity of the rear-stage press machine. (4) the front-end press machine includes fingers for transporting the blank formed by the blank processing, The method for manufacturing a can according to any one of (1) to (3) above, characterized in that in the first press step, the blanking process is carried out prior to the coining process, and the blank formed by the blanking process is finger-transported within the pre-process press machine. (5) The post-processing press machine is provided with fingers for transporting a formed product obtained by drawing and / or drawing and ironing the blank, The method for manufacturing a can described in any one of (1) to (4) above, wherein the fingers have contact portions made of a resin material or a rubber material, and the molded product is gripped and transported by the contact portions. (6) The method for producing a can according to any one of (1) to (5) above, wherein the can is an aluminum can.

[0030] (7) In a can manufacturing system using deep drawing by a press, A front-end press machine, a rear-end press machine, and a conveying means for conveying a blank from the front-end press machine to the rear-end press machine, The front-end press machine is configured to perform blanking and coining for reducing the thickness of the blank on the metal plate, A can manufacturing system, characterized in that the post-process press is configured to perform drawing and / or drawing and ironing to form rectangular cans. (8) The can manufacturing system according to (7), wherein the stroke of the front-end press is shorter than the stroke of the rear-end press. (9) The can manufacturing system according to (7) or (8), wherein the pressing capacity of the front-end press machine is higher than the pressing capacity of the rear-end press machine. (10) The can manufacturing system according to any one of (7) to (9), characterized in that the front-end press machine is configured to perform the blanking process prior to the coining process and has fingers that transport the blank formed by the blanking process within the front-end press machine. (11) The post-processing press machine is provided with fingers for transporting a formed product obtained by drawing and / or drawing and ironing the blank, The can manufacturing system according to any one of (7) to (10), wherein the contact portion of the finger with the molded product is made of a resin material or a rubber material. (12) The can manufacturing system according to any one of (7) to (11), wherein the cans are aluminum cans.

[0031] Although the embodiments of the present invention have been described in detail above with reference to the drawings, the specific configuration is not limited to these embodiments, and the present invention also includes design changes and the like that do not deviate from the gist of the present invention. Furthermore, the above-described embodiments can be combined by utilizing each other's technologies, so long as there are no particular contradictions or problems in the purpose, configuration, and the like. [Explanation of symbols]

[0032] 1. Manufacturing System 2. Front-end press machine 21 Front-end processing stage 21a Blank processing stage 21b Coining stage 22 Slides 221 Punch 23 Bolster 231 Die 24 Transfer device 241 Finger 2411 Contact part 3 Post-processing press machine 31 Post-processing stage 31a Receiving Stage 31b 1st molding stage 31c Final forming stage 32 Slides 321 Punch 33 Bolster 331 Die 34 Transfer device 341 Finger 3411 Contact part 4 Blank transport device 5 Cup conveying device B Blank C Cup S Aluminum Sheet

Claims

1. In a method for manufacturing a can by deep drawing with a press, A front-end press machine, a rear-end press machine, and a conveying means for conveying a blank from the front-end press machine to the rear-end press machine, a first pressing process in which blanking and coining are performed on the metal plate by the front-stage press machine to reduce the thickness of the blank; a conveying step of conveying a blank from the front-end press machine to the rear-end press machine; a second press process in which drawing and / or drawing and ironing are performed by the post-process press machine to form a rectangular can, the front-end press machine includes fingers for transporting the blank formed by the blank processing, The first pressing step includes a step of performing the blanking process prior to the coining process, and finger-transporting the blank formed by the blanking process in the front-stage pressing machine, A method for manufacturing a can, wherein the blank has a flat shape, the fingers grasp the blank by pinching it from both sides in the longitudinal direction, and the blank is transported in the minor axis direction.

2. In a method for manufacturing a can by deep drawing with a press, A front-end press machine, a rear-end press machine, and a conveying means for conveying a blank from the front-end press machine to the rear-end press machine, a first pressing process in which blanking and coining are performed on the metal plate by the front-stage press machine to reduce the thickness of the blank; a conveying step of conveying a blank from the front-end press machine to the rear-end press machine; a second press process in which drawing and / or drawing and ironing are performed by the post-process press machine to form a rectangular can, The post-processing press machine is provided with fingers for transporting a formed product obtained by drawing and / or drawing and ironing the blank, The molded product has a flat shape, and the fingers have contact portions made of a resin or rubber material, and the contact portions grip the molded product by pinching it from both sides in the longitudinal direction, and transport the molded product in the minor axis direction.

3. 3. The method for manufacturing a can according to claim 1, wherein the stroke of the front-stage press is shorter than the stroke of the rear-stage press.

4. 3. The method for manufacturing a can according to claim 1, wherein the pressing capacity of the front-stage press is higher than the pressing capacity of the rear-stage press.

5. 3. The method for manufacturing a can according to claim 1, wherein the can is an aluminum can.

6. In a can manufacturing system using deep drawing by a press, A front-end press machine, a rear-end press machine, and a conveying means for conveying a blank from the front-end press machine to the rear-end press machine, The front-end press machine is configured to perform blanking and coining for reducing the thickness of the blank on the metal plate, The post-process press is configured to form a rectangular can by performing drawing and / or drawing and ironing, The front-end press machine is configured to perform the blanking process prior to the coining process, and has fingers that transport the blank formed by the blanking process within the front-end press machine; A can manufacturing system, characterized in that the blank has a flat shape, and the fingers grasp the blank by pinching it from both sides in the longitudinal direction and transport the blank in the minor axis direction.

7. In a can manufacturing system using deep drawing by a press, A front-end press machine, a rear-end press machine, and a conveying means for conveying a blank from the front-end press machine to the rear-end press machine, The front-end press machine is configured to perform blanking and coining for reducing the thickness of the blank on the metal plate, The post-process press is configured to form a rectangular can by performing drawing and / or drawing and ironing, The post-processing press machine is provided with fingers for transporting a formed product obtained by drawing and / or drawing and ironing the blank, The molded product has a flat shape, and the contact portion of the finger with the molded product is made of a resin or rubber material, and the molded product is gripped by clamping it from both sides in the longitudinal direction and transported in the minor axis direction of the molded product.

8. 8. The can manufacturing system according to claim 6, wherein the stroke of the front-end press is shorter than the stroke of the rear-end press.

9. 8. The can manufacturing system according to claim 6, wherein the pressing capacity of the front-stage press machine is higher than the pressing capacity of the rear-stage press machine.

10. The can manufacturing system according to claim 6 or 7, wherein the cans are aluminum cans.

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