Square can manufacturing method

Abstract

To provide a manufacturing method for improving production efficiency.SOLUTION: There is provided a manufacturing method of a can by deep drawing by using a press. The manufacturing method of a can includes a control step in which the can is a square can having a square opening, and a heat medium which is fluid is supplied into a passage provided inside a punch and / or a die, and a temperature of the punch and / or a temperature of the die are controlled.SELECTED DRAWING: Figure 3

Description

[Technical Field]

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

[0002] BACKGROUND ART In the past, in deep drawing of metal cans, various techniques have been known for improving the dimensional accuracy of the metal cans after processing. One of these was a technology that supplied a lubricating coolant to the punch and workpiece to reduce friction and prevent the effects of heat. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 4-231119 Summary of the Invention [Problem to be solved by the invention]

[0004] When metal cans are produced by deep drawing using a press, the temperature of the can after it has been formed increases due to heat generated during the process, and as the temperature returns to normal, the dimensions of the can shrink due to the effects of thermal expansion. Furthermore, the mold itself expands with temperature, so at the start of production, the mold is cold and therefore small in size, but as production progresses, the temperature rises and the mold size increases. This leads to the problem of dimensional errors in the cans after molding, and in particular, when manufacturing rectangular cans such as battery cases, the long side is long, so dimensional fluctuations due to heat become significant. Furthermore, because the required precision of the long side dimension is strict, cans immediately after the start of production, which have unstable dimensions, have to be discarded, resulting in a problem of a large number of cans having to be discarded.

[0005] Furthermore, the technology for supplying coolant to the punch and workpiece as described in Patent Document 1 requires a large amount of coolant, and the use of coolant also necessitates degreasing and cleaning of the formed cans, which increases the number of processes and requires environmental measures such as treating the wastewater generated by the cleaning, posing issues in terms of efficiency and environmental impact.

[0006] As described above, an object of the present invention is to provide a manufacturing method that improves production efficiency. Another object of the present invention is to provide a press machine that is easy to use. [Means for solving the problem]

[0007] The method for manufacturing a can by deep drawing using a press machine according to the present invention is a rectangular can with a square opening, and includes a control step of supplying a heat transfer medium, which is a fluid, to a flow path provided inside the punch and / or die to control the temperature of the punch and / or the die. The flow path provided inside the punch is formed in a V-shape. This solves the above problem.

[0008] The press machine of the present invention for producing cans by deep drawing comprises a punch, a die, and a control unit, wherein the punch and / or the die deep draws rectangular cans having a square opening, the punch and / or the die have a flow path for a heat transfer medium, which is a fluid, inside the punch and / or the die, and the control unit controls the temperature and / or flow of the heat transfer medium flowing through the punch and / or the die. The flow path inside the punch is formed in a V shape. This solves the above problem. [Effects of the Invention]

[0009] With the above-described configuration, the present invention can improve production efficiency and provide a press machine that is easy to use. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a diagram showing a press machine according to an embodiment of the present invention; [Figure 2]1A to 1C are diagrams illustrating a molding process using a press machine according to an embodiment of the present invention. [Figure 3] FIG. 2 is a schematic diagram showing a punch of a press machine according to an embodiment of the present invention. [Figure 4] 1 is a block diagram of a system for cooling a press machine according to an embodiment of the present invention. [Figure 5] FIG. 10 is a block diagram of a modified example of the system for cooling a press machine according to an embodiment of the present invention. [Figure 6] FIG. 10 is a block diagram of a system for heating and cooling a press according to another embodiment of the present invention. [Figure 7] FIG. 10 is a schematic view showing a punch in a press machine according to still another embodiment of the present invention. [Figure 8] 10 is a graph showing the relationship between the number of cans discharged and the long side dimension in an experimental example of the present invention. [Figure 9] 9 is a graph showing an enlarged portion of the graph in FIG. 8. DETAILED DESCRIPTION OF THE INVENTION

[0011] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same reference numerals in different drawings denote parts with the same functions, 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.

[0012] Hereinafter, an embodiment of a method for manufacturing a can by deep drawing using a press 1, for example, a battery cell case for a lithium ion battery or the like, and a press 1 used in the manufacturing method of the present invention will be described with reference to the drawings. In this embodiment, a lithium ion battery cell case is manufactured, which is a square can with a rectangular opening.

[0013] [Press machine] FIG. 1 is a diagram showing a press machine 1 according to an embodiment of the present invention. 1, the press 1 of this embodiment is a so-called transfer press, and is provided with a first processing stage 11a, a second processing stage 11b, a third processing stage 11c, and a fourth processing stage 11d arranged in a line as processing stages 11. The processing stage 11 has a punch 12 and a die 13, and the first to fourth processing stages 11a to 11d are provided with first to fourth punches 12a to 12d and first to fourth dies 13a to 13d facing each other, respectively.

[0014] The first to fourth punches 12a to d are held by a slide 121 and lined up at a predetermined interval, and the first to fourth dies 13a to d are held by a bolster 131 and lined up at a predetermined interval. A transfer device (not shown) consisting of four pairs of fingers arranged opposite each other is disposed across the first to fourth processing stages 11a to d, and moves the workpiece 3 to the next processing stage 11 each time the first to fourth punches 12a to d held by the slide 121 that moves up and down move up and down.

[0015] FIG. 2 is a diagram showing a molding process in the press machine 1 according to one embodiment of the present invention. Next, the molding process will be described with reference to FIG. The first processing stage 11a is a blanking processing stage, in which a blanking step 111 is performed in which a blank 31 is cut out from the aluminum sheet 2 by blanking using a blank punch as the first punch 12a and a blank die as the first die 13a.

[0016] The second processing stage 11b and the third processing stage 11c are drawing processing stages. The drawing processing stages form the blank 31 cut out in the blanking process 111 into a cup shape. In the second processing stage 11b, a first forming process 112 is performed in which the blank 31 is formed into a thick oval first cup 32. Subsequently, in the third processing stage 11c, a second forming process 113 is performed in which the blank 31 is formed into a thin oval second cup 33.

[0017] The fourth processing stage 11d is a drawing and ironing processing stage, which is the final process. Following the drawing processing stage, a third forming process 114 is performed in which the second cup 33 is formed into a rectangular third cup 34 and the thickness of the formed cup is adjusted to a predetermined thickness.

[0018] The type and number of processing stages 11 that the press machine 1 has can be changed as appropriate depending on the type, shape, size, etc. of the product to be manufactured. Furthermore, the press machine 1 does not need to have all of the blanking stage, drawing stage, and drawing and ironing stage, and can also have additional processing stages 11 as needed, such as a coining stage and reforming stage. For example, the second processing stage 11b and the third processing stage 11c can be drawing and ironing stages, and the fourth processing stage 11d can be a drawing stage.

[0019] [punch] FIG. 3 is a schematic diagram showing a punch 12 of a press machine 1 according to an embodiment of the present invention. In the press 1 of this embodiment, all of the first to fourth punches 12a to 12d have flow paths 122 formed therein for passing cold water CW (a cooling medium), which is a heat medium for cooling the first to fourth punches 12a to 12d, as shown in Fig. 3. In particular, providing the flow path 122 in the fourth punch 12d, which is the punch in the fourth processing stage 11d, which is the final drawing stage or drawing and ironing stage, is important in order to reduce dimensional errors of cans.

[0020] In each of the first to fourth punches 12a to 12d, which have a rectangular shape when viewed from above (a cross section parallel to the opening surface of the can), two flow paths 122 are formed along the long sides. The number of flow paths 122 can be designed appropriately depending on the length of the long side of the rectangle, and can be one or three or more, but it is preferable to have multiple paths because this allows the punch 12 to be cooled more uniformly. The flow path 122 may be of a double tubular shape as shown in FIG. 3, or may have any other known shape such as a U-shaped side cross section.

[0021] [Cooling means / control unit] FIG. 4 is a block diagram of a system for cooling the press machine 1 according to one embodiment of the present invention. The cooling means 4 for cooling the punch 12 will be described with reference to FIG. 4, which is a block diagram of a system for cooling the press machine 1 according to one embodiment of the present invention.

[0022] The cooling means 4 has a water cooler 41 and a pump 42. Chilled water CW (cooling medium) is supplied from the water cooler 41 to the punch 12 by the pump 42, and is returned to the water cooler 41 through a flow path 122 inside the punch 12. The water cooler 41 is provided with a temperature sensor 411, and is controlled by the control unit 5 so that the chilled water CW (cooling medium) is at a predetermined temperature (approximately 10°C to 25°C), for example, 20°C. The pump 42 is controlled by the control unit 5 so as to provide a predetermined flow rate. The heat medium is not limited to water, but may be any fluid material such as oil, coolant, or gas.

[0023] As a result, the cold water CW (cooling medium) serving as the heat transfer medium is maintained at a predetermined temperature by the water cooler 41 and is supplied at a predetermined flow rate to the flow path 122 in the punch 12, cooling the punch 12 and stabilizing the temperature of the punch 12. It goes without saying that the predetermined temperature and flow rate of the cold water CW (cooling medium) can be set as appropriate.

[0024] The cooling means 4 may be installed either inside or outside the press 1. The control unit 5 may be installed in the cooling means 4 and may be a device that controls only the cooling means 4, or may be configured as part of the functions of a control device that controls the entire press 1, i.e., as a module of a control program. The control device for the entire press 1 may be installed either inside or outside the press 1, and may also be installed remotely from the press 1 via a communication network with the press 1. Furthermore, the functions (programs) of the control unit 5 may all be located in a centralized location or may be distributed across multiple locations, or may be a control system that can control multiple presses 1.

[0025] [Manufacturing method] The method for manufacturing a battery cell case using the above-described press machine 1 will now be described, particularly with regard to the temperature control of the punch 12 (control step). In the press 1, heat is generated when the punch 12 and the workpiece 3 come into contact. In particular, a large amount of heat is generated during drawing and drawing and ironing, causing the temperatures of the punch 12 and the workpiece 3 to rise. Because the punch 12 and the workpiece 3 are made of metal, they expand due to the temperature rise. After processing, the temperature of the workpiece 3 drops and it shrinks from its thermally expanded state, causing the dimensions of the workpiece 3 to change due to this expansion and contraction. If the temperature of the workpiece 3 is not stable, the amount of thermal contraction of the can after processing will not be stable, and the final dimensions will also not be stable, resulting in large fluctuations in dimensional error.

[0026] Therefore, in order to stabilize the temperature of the workpiece 3, cold water CW (a cooling medium) is supplied to the flow path 122 in the punch 12. In order to stabilize the temperature of the punch 12, the water as a heat medium is controlled to, for example, 20°C, and is supplied at a flow rate necessary to cool the punch 12 and stabilize its temperature (cooling process).

[0027] Furthermore, the punch 12 itself expands due to temperature, so even if the punch 12 is cold at the start of production and therefore small in size, as production progresses the temperature rises and the size increases, but this can also suppress dimensional errors in the cans after molding.

[0028] When the long side dimension / short side dimension value of the rectangular opening of the can is large, the difference between the long side dimension error and the short side dimension error becomes large, and the adverse effect of dimensional fluctuations on the entire can becomes greater. Therefore, the larger the long side dimension / short side dimension value, the greater the effect of suppressing dimensional errors by temperature control of punch 12. An effect is obtained when the long side dimension / short side dimension value is 2 or more, but the effect is greater when the long side dimension / short side dimension value is 5 or more, even greater when it is 7 or more, and even greater when it is 10 or more. Variation 1

[0029] (1) The press machine 1 described above controls the chilled water CW (cooling medium) to a predetermined temperature, but does not directly control the temperature of the punch 12. However, as shown in FIG. 5, it is also possible to provide a temperature sensor 123 in the punch 12 and configure the control unit 5 to control the temperature and flow rate of the chilled water CW (cooling medium) so that the temperature of the punch 12 becomes the predetermined temperature. This makes it possible to adjust the temperature of the workpiece 3 more precisely.

[0030] (2) In the press 1 described above, controlling the temperature of the punch 12, which has a large contact area with the workpiece 3, is effective in stabilizing the temperature of the workpiece 3, so only the punch 12 is cooled, but the temperature of the die 13 also rises. Therefore, by providing a flow path 122 in the die 13 and supplying cold water CW (cooling medium), the die 13 can be cooled and the temperature of the workpiece 3 can be further stabilized. As with the punch 12, providing a flow path 122 in the fourth die 13d, which is the die of the fourth processing stage 11d, which is the final drawing stage or drawing and ironing stage, is particularly important in reducing dimensional errors in cans.

[0031] (3) In the above-described press machine 1, the temperature and flow rate of the chilled water CW (cooling medium) are controlled by the cooling means 4 and the control unit 5, but it is also possible to control only one of them.

[0032] (4) The above-described press machine 1 processes an aluminum workpiece 3. However, it may also process a workpiece 3 made of other metals such as stainless steel. Furthermore, it may also process a workpiece 3 having a laminated structure in which metal is coated with resin or the like.

[0033] (5) The press 1 described above is for producing cans with rectangular openings. It may also be for producing cans with square openings, or even cans of other shapes, such as circular or oval cans. The effect of suppressing dimensional errors achieved by the first embodiment can also be achieved in the production of cans of other shapes. Embodiment 2

[0034] In the first embodiment, the temperature of the punch 12 is stabilized by cooling the heated punch 12 with cold water CW (cooling medium) which is a heat medium. In addition, in embodiment 2, the punch 12, which is at a low temperature, is heated with hot water HW (heat medium), which is a heat medium, and the basic configuration of the press 1, punch 12, die 13, etc. is the same as in embodiment 1.

[0035] [Heating / Cooling Means / Control Unit] FIG. 6 is a block diagram of a system for heating and cooling a press machine 1 according to another embodiment of the present invention. 6, a heating / cooling means 6 having a water cooler 61 and a water heater 62 is used instead of the cooling means 4 of the first embodiment. The water cooler 61 and the water heater 62 are provided with temperature sensors 611 and 621, respectively, and are controlled by the control unit 5 so that the cold water CW (cold medium) is at a predetermined temperature (about 10°C to 25°C), for example, 20°C, and the hot water HW (hot medium) is at a predetermined temperature (about 35°C to 100°C), for example, 70°C.

[0036] The heating / cooling means 6 is provided with a switching means 63 for switching between cold water CW (cold heat medium) and hot water HW (hot heat medium), and can be switched depending on whether the punch 12 is to be heated or cooled. The cold water CW (cold heating medium) or hot water HW (hot heating medium) selected by the switching means 63 is controlled by the control unit 5 to a predetermined flow rate from the pump 42, supplied to the punch 12, and returned to the water cooler 61 or water heater 62 through the flow path 122 within the punch 12. The heat medium is not limited to water, but may be any fluid material such as oil, coolant, or gas.

[0037] As a result, the heat transfer media, cold water CW (cold heat transfer medium) and hot water HW (hot heat transfer medium), are maintained at predetermined temperatures by the water cooler 61 and water heater 62, respectively, and are supplied at a predetermined flow rate to the flow path 122 in the punch 12, cooling the punch 12 and stabilizing the temperature of the punch 12. It goes without saying that the predetermined temperatures and flow rates of the cold water CW (cold heat transfer medium) and hot water HW (hot heat transfer medium) can be set as appropriate.

[0038] The heating and cooling means 6 may be installed either inside or outside the press 1. The control unit 5 may be installed in the heating and cooling means 6 and may be a device that controls only the heating and cooling means 6, or it may be configured as part of a control device that controls the entire press 1, i.e., as one module of a control program. The control device for the entire press 1 may be installed either inside or outside the press 1, and may also be installed remotely from the press 1 via a communication network with the press 1. Furthermore, the functions (programs) of the control unit 5 may all be located in a centralized location or may be distributed across multiple locations, or may be a control system that can control multiple presses 1.

[0039] [Manufacturing method] The method for manufacturing a battery cell case using the above-described press machine 1 will now be described, particularly with regard to the temperature control of the punch 12 (control step). Cooling of the punch 12 is the same as in the first embodiment, so heating will be described below.

[0040] Generally, immediately after production begins, the press body and dies such as punches are cold, so the temperature of the work 3 being processed and the cans immediately after processing is low, but as the number of production units increases, the temperature of the work 3 being processed and the cans immediately after processing rises due to heat generated during processing, and becomes constant at a certain temperature. Therefore, immediately after production begins, the final dimensions of the cans tend to be large, and as the number of production units increases, the final dimensions of the cans tend to become smaller.

[0041] Therefore, in order to quickly stabilize the temperature of the workpiece 3 after the start of production, it is advisable to raise the temperature of the punch 12 before the start of production. For this purpose, before the start of production, the switching means 63 supplies hot water HW (hot heat medium) at, for example, 70°C as the heat medium to the flow path 122 of the punch 12 (heating process).

[0042] The timing of switching from cold water CW (cold heat transfer medium) to hot water HW (hot heat transfer medium) is the timing of switching from cold water CW (cold heat transfer medium) to hot water HW (hot heat transfer medium) in the flow path 122 of the punch 12, and is adjusted, for example, within 300 seconds after the start of production. Depending on the specific production process, the switching may occur before the start of production. Needless to say, the actual switching timing of the switching means 63 is controlled to be earlier than the switching timing in the flow path 122 of the punch 12, taking into account the time it takes for the heat transfer medium to reach the flow path 122 of the punch 12 from the switching means 63.

[0043] Furthermore, the punch 12 itself expands due to the temperature, so even if the punch 12 is cold and small immediately after the start of production, the temperature rises and the dimensions increase as production progresses, but this can also suppress dimensional errors in the cans after molding.

[0044] Then, after some time has passed since the start of production, the switching means 63 supplies cold water CW (cold heat transfer medium), for example, 20°C cold water CW (cold heat transfer medium), to the flow path 122 in the punch 12, as in embodiment 1, to cool the punch 12 and stabilize the temperature (cooling process).

[0045] When the long side dimension / short side dimension value of the rectangular opening of the can is large, the difference between the long side dimension error and the short side dimension error becomes large, and the adverse effect of dimensional fluctuations on the entire can becomes greater. Therefore, the larger the long side dimension / short side dimension value, the greater the effect of suppressing dimensional errors by temperature control of punch 12. An effect is obtained when the long side dimension / short side dimension value is 2 or more, but the effect is greater when the long side dimension / short side dimension value is 5 or more, even greater when it is 7 or more, and even greater when it is 10 or more. Variation 2

[0046] (1) In the above-described press machine 1, the supply of cold water CW (cold heat transfer medium) is switched to hot water HW (hot heat transfer medium) at a predetermined timing. However, it is also possible to stop the supply of cold water CW (cold heat transfer medium) and then switch to hot water HW (hot heat transfer medium) and start supplying it after a predetermined time.

[0047] (2) The press machine 1 described above controls the cold water CW (cooling medium) or hot water HW (hot medium) to a predetermined temperature, but does not directly control the temperature of the punch 12. However, as shown in FIG. 5, it is also possible to provide a temperature sensor 123 in the punch 12 and configure the control unit 5 to control the temperature and flow rate of the cold water CW (cooling medium) or hot water HW (hot medium) so that the temperature of the punch 12 becomes the predetermined temperature. This makes it possible to adjust the temperature of the workpiece 3 more precisely.

[0048] (3) In the press 1 described above, controlling the temperature of the punch 12, which has a large contact area with the workpiece 3, is effective in stabilizing the temperature of the workpiece 3, so only the punch 12 is heated and cooled. However, by providing a flow path 122 in the die 13 as well and supplying cold water CW (cold medium) or hot water HW (hot medium) to heat and cool the die 13, the temperature of the workpiece 3 can be further stabilized. As with the punch 12, providing a flow path 122 in the fourth die 13d, which is the die of the fourth processing stage 11d, which is the final drawing or drawing and ironing stage, is particularly important in order to reduce dimensional errors in the can.

[0049] (4) In the above-described press machine 1, the heating and cooling means 6 and the control unit 5 control the temperature and flow rate of the cold water CW (cold heat transfer medium) or the hot water HW (hot heat transfer medium), but it is also possible to control only one of them.

[0050] (5) The above-described press machine 1 processes the workpiece 3 made of aluminum, but it may also process the workpiece 3 made of other metals such as stainless steel. Furthermore, it may also process the workpiece 3 having a laminated structure in which metal is coated with resin or the like.

[0051] (6) The press 1 described above is for producing cans with rectangular openings, but it may also be for producing cans with square openings, or even cans of other shapes, such as circular or oval cans. It goes without saying that the effect of suppressing dimensional errors achieved by the second embodiment can also be achieved in the production of cans of other shapes.

[0052] FIG. 7 is a schematic diagram showing a punch 12 in a press machine 1 according to still another embodiment of the present invention. Another embodiment of the shape of the flow passage 122 of the punch 12 will now be described. In the press 1 of this embodiment, flow paths 122 are formed inside all of the first to fourth punches 12a to 12d, through which cold water CW (cold heat medium) that is a heat medium for cooling the first to fourth punches 12a to 12d or hot water HW (hot heat medium) that is a heat medium for heating the first to fourth punches 12a to 12d passes, as shown in Fig. 7. In particular, providing the flow path 122 in the fourth punch 12d, which is the punch in the fourth processing stage 11d that is the final drawing stage or drawing and ironing stage among the drawing stages and drawing and ironing stages, is important in order to reduce dimensional errors of cans.

[0053] In each of the first to fourth punches 12a to 12d, which have a rectangular shape when viewed from above (a cross section parallel to the opening surface of the can), two flow paths 122 are formed along the long sides. The number of flow paths 122 can be designed appropriately depending on the length of the long side of the rectangle, and can be one or three or more, but it is preferable to have multiple paths because this allows the punch 12 to be cooled more uniformly.

[0054] In the third embodiment, the flow path 122 is provided so that its side cross section is V-shaped, as shown in Fig. 7. This shape not only increases the contact area between the punch 12 and the heat transfer medium, cold water CW (cold heat transfer medium) or hot water HW (hot heat transfer medium), thereby improving the cooling or heating efficiency of the punch 12, but also has the advantage that such a V-shaped flow path 122 can be easily formed by simply drilling two holes in the upper surface of the punch 12.

[0055] [Experimental Example] When using the press 1 of the present invention to process an aluminum battery cell case with a rectangular opening, we measured the variation in the long side dimension of the battery cell case after processing when cold water CW (cold heat transfer medium) at 20°C was supplied to the flow path 122 of the punch 12, and the variation in the long side dimension of the battery cell case after processing when hot water HW (hot heat transfer medium) was supplied before production began and then switched to cold water CW (cold heat transfer medium) at the start of production. The long side dimension of the battery cell case was 100 mm, the short side dimension was 10 mm, and the long side dimension / short side dimension value was 10.

[0056] As shown in Fig. 8, which is a graph showing the relationship between the number of cans dispensed and the long side dimension in an experimental example of the present invention, it can be seen that when switching from hot water HW (hot heat medium) to cold water CW (cold heat medium), the number of cans dispensed until the dimension stabilizes is fewer. Also, as shown in Fig. 9, which is a graph enlarging a portion of the graph in Fig. 8, it can be seen that the number of cans dispensed until the long side dimension falls below the upper limit of the standard is also fewer.

[0057] The embodiments of the present invention have been described above in detail with reference to the drawings, but the specific configurations are not limited to these embodiments, and the present invention also includes design changes and the like within the scope of the present invention that do not deviate from the gist of the present invention. Furthermore, the above-described embodiments can be combined by utilizing the techniques of each other, as long as there are no particular contradictions or problems in the purpose, configuration, etc., of the embodiments. It goes without saying that the present invention also includes combinations of the first to third embodiments. [Industrial Applicability]

[0058] The present invention can be suitably used in the field of can manufacturing, which is environmentally friendly while maintaining processability and molding stability. [Explanation of symbols]

[0059] 1 Press machine 11 Processing stage 11a~d 1st to 4th processing stages 111 Blanking process 112 1st molding process 113 2nd molding process 114 3rd molding process 12 Punch 12a~d 1st~4th punches 121 slides 122 Channel 123 Temperature Sensor 13 Die 13a~d 1st to 4th dies 131 Bolster 2 seats 3 Work 31 Blank 32 1st Cup 33 2nd Cup 34 3rd Cup 4 Cooling means 41 Water cooler 411 Temperature Sensor 42 Pump 5. Control section 6 Heating and cooling means 61 Water cooler 611 Temperature Sensor 62 Water heater 621 Temperature Sensor 63 Switching Method CW Cold Water HW hot water

Claims

1. In a method of manufacturing a can by deep drawing using a press, The can is a rectangular can with a square opening, a control step of supplying a heat medium as a fluid to a flow path provided inside the punch and / or the die to control the temperature of the punch and / or the die, 10. A method for manufacturing a can, wherein the flow path provided inside the punch is formed in a V-shape.

2. 2. The method for manufacturing a can according to claim 1, wherein the control step includes a heating step of supplying a hot heating medium as the heating medium to the flow path in advance before the press starts production to heat the punch and / or the die.

3. 3. The method for manufacturing a can according to claim 2, wherein the control step further includes a cooling step of switching the heat medium to a cold heat medium to cool the punch and / or the die.

4. 4. The method for manufacturing cans according to claim 3, wherein the timing for switching to the cooling medium is within 300 seconds after the start of production.

5. The method for manufacturing a can according to any one of claims 1 to 4, characterized in that the heat transfer medium is a hot heat transfer medium and / or a cold heat transfer medium, the hot heat transfer medium being at 35°C to 100°C and the cold heat transfer medium being at 10°C to 25°C.

6. The method for manufacturing a can according to any one of claims 1 to 5, characterized in that the deep drawing process involves a plurality of drawing and / or draw-ironing steps, and the punch and / or die that control the temperature of the punch and / or the temperature of the die are the punch and / or the die used in a final step of the plurality of drawing and / or draw-ironing steps.

7. The method for manufacturing a can according to any one of claims 1 to 6, wherein the can is an aluminum can.

8. 8. The method for manufacturing a can according to claim 7, wherein the opening of the square can is rectangular, and the ratio of the long side dimension to the short side dimension of the rectangle is 2 or more.

9. The method for manufacturing a can according to any one of claims 1 to 8, characterized in that the punch has a rectangular cross-sectional shape parallel to the opening surface of the can, and the V-shaped flow channels are arranged in a plurality in the long side direction of the cross-sectional shape.

10. In a press machine that performs deep drawing of cans, A punch, a die, and a control unit are provided. The punch and / or the die are used to perform the deep drawing of a rectangular can having a square opening, The punch and / or the die have a flow path for a heat transfer medium, which is a fluid, inside thereof, the control unit controls the temperature and / or flow of the heat medium flowing through the punch and / or the die, A press machine characterized in that the flow path inside the punch is formed in a V shape.

11. The press machine according to claim 10, characterized in that the control unit controls the temperature and / or flow of the hot medium so as to supply a hot medium as the heat medium to the flow path in advance before production of the press machine starts, thereby heating the punch and / or the die.

12. The press machine according to claim 11, wherein the control unit controls the temperature and / or flow of the cooling medium so as to switch the heating medium to a cooling medium to cool the punch and / or the die.

13. The press machine according to claim 12, wherein the control unit controls the timing of switching to the cooling medium to be within 300 seconds after the start of production.

14. The press machine according to any one of claims 10 to 13, wherein the heat medium is a hot medium and / or a cold medium, and the control unit controls the hot medium to be at 35°C to 100°C and the cold medium to be at 10°C to 25°C.

15. The deep drawing process involves a plurality of drawing steps and / or drawing and ironing steps, The press machine according to any one of claims 10 to 14, characterized in that the control unit controls the temperature and / or flow of the heat medium flowing through the punch and / or the die used in a final step of the plurality of drawing steps and / or drawing and ironing steps in the deep drawing.

16. 16. The press according to claim 10, wherein the can is an aluminum can.

17. The press according to claim 16, wherein the opening of the square can is rectangular, and the ratio of the long side dimension to the short side dimension of the rectangle is 2 or more.

18. The press machine according to any one of claims 10 to 17, characterized in that the punch has a rectangular cross-sectional shape parallel to the opening surface of the can, and the V-shaped flow passages are arranged in a plurality in the direction of a long side of the cross-sectional shape.

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