JP5173217B2 - Thin plate punching method and punching apparatus - Google Patents

Description

  The present invention relates to a thin plate punching method and a punching processing apparatus. More specifically, the present invention relates to a thin plate made of a metal or a resin material, for example, a plate thickness of 0. The present invention relates to a thin plate punching method and a punching apparatus for punching a thin plate of about 15 mm so as not to generate burrs.

  Battery cans and built-in components such as electrodes and center pins are manufactured through punching, bending, and shearing processes from a thin plate made of a metal or a resin material. Various types of thin plate punching apparatuses used in this processing process have been developed (see, for example, Patent Documents 1 and 2 below).

For example, Patent Document 1 below discloses a processing apparatus that punches and shears a thin plate. FIG. 9 shows an outline of punching out a thin plate using the processing apparatus disclosed in Patent Document 1 below.
As shown in FIG. 9, the thin plate punching apparatus 50 includes a lower mold 51 provided with a loose insertion hole 51A, an upper mold 52 provided with a biting hole 52A, and a loose insertion hole 51A of the lower mold 51. The lower punch 54 is moved up and down, and the upper punch 53 is moved up and down in the biting hole 52A of the upper die 52. Then, it is moved up and down by these drive mechanisms.

Here, an example of a method for shearing a thin plate using the above-described processing apparatus will be described below.
First, the thin plate 55 is placed on the lower mold 51 and fixed. Then, the lower punch 54 ascends from below the positioned and fixed thin plate 55 and is partially punched in a state where a part of the thin plate 55 is connected (see FIG. 9A). Next, the upper punch 53 is lowered, and the half-punched portion is returned to the same plane as the other thin plate 55 (see FIG. 9B). Thereafter, the thin plate 55 is punched by raising the lower punch 54, for example.

  FIG. 10 shows a process for processing a die for cutting an electrode plate of a battery described in Patent Document 2 below. This cutting die includes an upper die 60 and a lower die 64. The upper die 60 is provided with a cutting edge 61, an outer stripper 62 and an inner stripper 63, and the lower die 64 has an anvil 65 and a lifter. 66 is provided.

With reference to Fig.10 (a)-FIG.10 (e), the cutting of the electrode plate using this cutting die is demonstrated.
First, the upper die 60 is raised, and a strip-like positive electrode plate material P is fed onto the lower die 64 to be positioned and fixed (see FIG. 10A). Next, the upper die 60 is lowered, and the positive plate material P is pressed onto the upper surfaces of the anvil 65 and the lifter 66 of the lower die 64 by the outer stripper 62 and the inner stripper 63 and is held in a flat shape. After that, the sharp wedge-shaped cutting edge 61 is lowered and comes into contact with the positive electrode plate material P, and a predetermined force is applied to the positive electrode plate material P while being sandwiched between the cutting edge 61 and the anvil 65 so that the positive electrode plate P ₁ is cut (see Figure 10 (b)).

Thereafter, the positive electrode plate material P which is apertured is held in a state of being pressed against the anvil 65 by the blade 61 cut the outer stripper 62, the positive electrode plate P ₁ that is cut is interposed between the inner stripper 63 and the lifter 66 is held in the flat state, the positive electrode plate P ₁ in this state is pushed a predetermined distance to the inside diameter portion of the blade 61 off is pushed up by the force of the lifter 66. This pushing range is set to a range of 0.05 to 3 mm (see FIG. 10C). Thereafter, the outer stripper 62 only blade 61 cut not move is increased, increase of the cutting edge 61 is carried out until positioned at the front end portion of the blade 61 expired positive plate P ₁ (see FIG. 10 (d)). Finally, the outer stripper 62, the positive electrode plate _{P 1} is taken all the inner stripper 63 and cutting edge 61 is raised (see FIG. 10 (e)).

When the above-described cutting die is used, the cut positive electrode plate P ₁ is once pushed into the inner diameter portion of the cutting blade 61 and then lifts the cutting blade 61, so that the inner side of the cutting blade 61 is the positive electrode plate P _1. cut surface and because they are a predetermined distance one reciprocation in a direction parallel to the friction force acts on the cut surface of the inner surface and the positive electrode plate P ₁ of the cutting edge 61, burrs generated in the vicinity of the cut surface is falling, or less Shortened.
JP-A-7-195130 (FIGS. 6, 7, paragraphs [0039] to [0046]) JP 2002-126828 A (FIG. 1, paragraphs [0024] to [0032])

  By the way, when manufacturing parts having complicated bends, a multi-forming processing method is generally used in which a thin plate as a material is positioned at approximately one place and concentrated to perform a series of processing. When this method is used, there is no cause of burrs or the like in the finished product, which is particularly preferable for the manufacture of center pins and the like. However, in this multi-forming process, since a predetermined punch is driven from the periphery into a development member having a predetermined shape, the processing speed is slow, for example, around 70 spm. For this reason, considering recent processing costs, the cost becomes high, and the apparatus itself becomes complicated and expensive.

  On the other hand, a progressive feed method is known as a processing method with a low manufacturing cost that enables a large amount of processing in a shorter time than the multi-forming method. In this progressive feeding system, a series of production lines are arranged in series, and a hoop-shaped base material is conveyed into the production lines. However, when this progressive feeding method is used, there is a risk that burrs may remain when the connecting portion between the carrier portion of the hoop-shaped base material and the processed product portion is cut.

  According to the punching apparatus shown in Patent Document 1, since the thin plate is half-punched and then returned in the reverse direction, the occurrence of burrs at the corners is suppressed. However, when this processing apparatus is made into a thin plate, an internal crack may occur even if the pressing amount is about 0.05 mm in a thin pressing amount, for example, a thin plate having a thickness of 0.15 mm (see FIG. 9C). Particularly, a thin plate made of a hard material, for example, a thin plate made of stainless steel, is likely to cause such internal cracks. When such an internal crack occurs, there is a risk of increasing the defective rate of component processing.

  When the processing device disclosed in Patent Document 1 is used at the joint between the carrier portion of the base material and the processed product portion in the progressive feed method, the diameter of the upper and lower mold holes is set to the upper and lower punches due to the structure of the processing device. Therefore, it is difficult to avoid the generation of burrs because a gap is formed between the lower punch and the hole provided in the lower mold. Moreover, when the above-mentioned internal crack occurs, the joint portion is cut during the process, and the processed product portion is easily detached from the carrier portion. In particular, when a process of bending the processed product part into a predetermined shape is included, the process product is cut in this process, and subsequent processes cannot be continued, resulting in an increased defect rate.

  Further, the electrode plate cutting mold shown in Patent Document 2 moves up and down the inside of the cutting blade while the positive electrode plate is sandwiched between the stripper and the lifter even after the electrode plate is cut. Since the movement distance must be set within a predetermined range, that is, a range of 0.05 to 3 mm, the adjustment of the movement distance becomes troublesome.

  For example, if the movement distance is increased, the cutting speed is reduced, and if the movement distance is reduced, the effect of crushing burrs is reduced. Since it is necessary to set the moving distance, the adjustment becomes troublesome. On the other hand, if the moving distance is smaller than 0.05 mm, it becomes unstable to hold the electrode plate inside the cutting blade, and if it is larger than 3 mm, it is unnecessary compared with the thickness of the electrode plate. It becomes large and causes troubles such as deformation.

  The present invention has been made to solve the above-described problems of the prior art, and an object of the present invention is to provide an ultrathin plate, for example, a plate thickness of 0. It is an object of the present invention to provide a thin plate punching method capable of punching a thin plate having a thickness of about 15 mm without causing burrs.

  Another object of the present invention is to provide a thin plate punching apparatus that does not require troublesome adjustment work and can punch an extremely thin plate with a simple configuration so as not to generate burrs.

In order to achieve the above object, a thin plate punching method according to the first aspect of the present invention includes the steps shown in the following (a) to (c).
(A) a step of positioning and fixing a thin plate as a workpiece to the die 22;
(B) A movable punch and a pressure punch that are slidably contacted with each other, wherein the movable punch includes a cutting edge portion sharpened at an acute angle from an edge of the surface on the pressure punch side, and the pressure punch Uses a blade having a sharp edge from the edge of the surface of the movable punch side, and drives the sharp edge of the movable punch into the surface facing the die through the thin plate. Half-punching the thin plate with the die;
(C) The cutting edge sharpened to the acute angle of the pressure punch from one side of the movable punch in a state where the sharp cutting edge of the movable punch is in contact with the half-cut thin plate The process of punching by pressing against a half-punched part of a thin plate.

The thin plate punching method according to the second aspect is the thin plate punching method according to the first aspect, wherein a notch groove is formed on the surface of the thin plate into which the movable punch is driven before the step (b). In the step (b), the movable punch is driven into the portion where the notch groove is provided, and half cut out.

The thin plate punching method according to the third aspect is the thin plate punching method according to the second aspect, wherein the notch groove is formed in a V shape and the angle of the bottom thereof is in the range of 60 ° to 120 °. It is characterized by being within.

A thin plate punching processing apparatus according to the fourth aspect of the present invention includes a first die provided with a die, and a second die provided with a pressure punch and a stripper for punching the thin plate in cooperation with the die. In a thin plate punching apparatus in which at least one of the first and second molds is connected to a drive mechanism and punches the thin plate as a workpiece between the die and the pressure punch,
The second mold is provided with a movable punch for half-pulling the thin plate on the stripper, and the movable punch has a cutting edge pointed at an acute angle from an edge of the surface on the pressure punch side, The movable punch is provided with a blade edge pointed at an acute angle from the edge of the surface on the movable punch side. The movable punch and the pressure punch are slidably contacted with each other, and the movable mechanism moves the movable punch. After the punch is actuated and the thin plate is half-punched by the die with the sharp edge of the movable punch and the die, the pressure punch is actuated by the drive mechanism to sharpen the acute angle of the pressure punch. The blade edge is pressed against a half-punched portion of the thin plate to punch out the half-punched portion .

The thin plate punching apparatus according to the fifth aspect of the present invention is the thin plate punching apparatus according to the fourth aspect, wherein the surface of the movable punch on the side of the pressure punch and the outer surface of the die are identical. It is located on the line.

By providing the above configuration, the present invention has the following excellent effects. That is, according to the method for punching a thin plate according to the first aspect of the present invention, the thin plate is first half-punched at the sharp edge of the movable punch, so that the movable punch is driven by this half-punch. Appropriate sagging is formed at the upper and lower corners of the location. After that, the half-punched part is punched with a sharp edge of the pressure punch , but at this point, an appropriate sag is already formed on the product side, and the part where this sag is formed is added. Since the punch is punched out by the sharp edge of the pressure punch , no burrs are generated in the sheared cross section of the product. In addition, since the movable punch and the pressure punch are slidably contacted with each other, even if a high load is applied to any one of the punches, the movable punch and the pressure punch are not supported and bent. Half punching or punching can be performed.

Further, according to the sheet punching method according to the second and third aspects of the present invention, by forming a pre-notched groove in a thin plate, when pushed in the movable punch into this groove, the movable punch The pushing resistance load applied to the is reduced. This load reduction facilitates half-punching and punching. In addition, since the load on the movable punch is reduced, the cutting edge of the blade of the movable punch can be reduced. Furthermore, even if the kerf is provided in the thin plate, the predetermined mechanical strength can be maintained, so that the product does not come off the carrier part during the processing as in the prior art. In addition, since the movable punch and the pressure punch are slidably contacted with each other, even if a high load is applied to any one of the punches, the movable punch and the pressure punch are not supported and bent. Half punching or punching can be performed.

According to the thin plate punching processing apparatus according to the fourth aspect of the present invention, by providing a movable punch, and by half-punching the thin plate with the movable punch and the die, it becomes possible to attach an appropriate sag to the thin plate, As a result, it is possible to prevent the generation of burrs when punching with a pressure punch. In addition, since it is not necessary to provide a complicated mechanism, the device itself can be manufactured at low cost.

Further, according to the thin plate punching apparatus according to the fifth aspect of the present invention, since the surface of the movable punch facing the pressure punch and the outer surface of the die are located on the same straight line, the thin plate is accurately positioned. Can be stamped.

  Hereinafter, the best embodiment of the present invention will be described with reference to the drawings. However, the embodiment shown below exemplifies a thin plate punching method and a punching device for embodying the technical idea of the present invention, and the present invention is specified to this thin plate punching method and punching device. And other embodiments within the scope of the claims are equally applicable.

  First, a thin plate punching apparatus according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. 1 is a partial longitudinal sectional view of the thin plate punching apparatus, and FIG. 2 is an enlarged sectional view of a portion X in FIG. FIG. 1 shows a left-side cross-section of the punching device divided from the substantially central portion to the left and right, and members having the same structure as the left side exist on the right side (not shown).

  As shown in FIG. 1, the thin plate punching apparatus 10 includes an upper mold 11 and a lower mold 20 as a first mold and a second mold, and the lower mold 20 is fixed to a base (not shown). 11 is connected to a drive mechanism (not shown). Hereinafter, the configurations of these upper and lower molds will be described in detail.

  The upper die 11 has an upper die base plate 12 and a stripper 17, and the stripper 17 is supported by guide bolts 13 and coil springs 16 and is coupled to the upper die base plate 12 so as to be movable up and down. In this vertically movable connection, a through hole 12a having a size that allows the guide bolt 13 to be loosely fitted in the upper mold base plate 12 is formed in the vertical direction, and the guide bolt 13 is inserted into the through hole 12a. This is realized by fixing the stripper 17 to the end portion of 13. An extended coil spring 16 is inserted through the guide bolt 13 that connects the base plate 12 and the stripper 17. With this configuration, when the upper mold base plate 12 is lowered by a drive mechanism (not shown), the stripper 17 is lowered and pressed against the lower mold 20, and when the upper mold base plate 12 is further lowered, the stripper 17 is moved to the coil spring. A predetermined elastic force is applied to the stripper 17 by being raised against the urging force of 16. By applying elasticity to the stripper 17, the movable punch 19 mounted on the stripper 17 is pressed against a thin plate as a workpiece with a predetermined elastic force.

The upper mold base plate 12 is fixed by a punch holder 14 with a pressure punch 15 hanging downward on the back side thereof. The pressure punch 15 is formed of a plate-like body made of a steel material having a predetermined thickness and having a mounting portion 15 _{A on the} upper side and a cutting edge portion 15 _B on the lower side.

Next, the pressure punch 15 will be described with reference to FIG. The pressing punch 15 is perforated in the suspended state, the flat surface located on the inside, in detail first vertical plane 15 _1, a second vertical surface 15 ₂ of the outer facing the first vertical surface 15 ₁ and, cutting edge 15 _B is in a cutting edge 15 ₀ the tip is formed an acute angle of the inclined surfaces 15 ₃ has a wedge-shaped toward the lower distal end of the first vertical surface 15 ₁ to the second vertical surface 15 _2. The cutting edge 15 ₀ angle of about 60 °, the width dimension is made equal to or slightly longer the width length of the cut portion of the workpiece (e.g., coupling 32 of FIG. 5). The first vertical surface 15 ₁ is positioned and fixed to the punch holder 14 so as to abut against the first vertical surface 19 ₁ of the movable punch 19 to be described later. The pressing punch 15 is inserted into a loosely fitted hole 18a of the bottom plate 18 of the stripper 17, a first vertical surface 19 of the first vertical surface 15 ₁ is movable punch 19 in the through hole 17a formed in the stripper 17 ₁ Is slidably contacted.

Movable punch 19, as shown in FIG. 2, consists predetermined thickness of the plate-like body having a cutting edge portion 19 _B to the mounting portion 19 _A and the lower side to the upper side, are formed of steel. That is, the movable punch 19, the flat surface located on the inside, details have ₁ as the first vertical surface 19, and _two second vertical surface 19 of the outer facing the first vertical surface 19 _1, the cutting edge 19 _B is without a wedge having an inclined surface 19 ₃ of the acute angle from the first vertical surface 19 ₁ of the lower tip towards the ₂ second vertical surface 19, the tip portion is a cutting edge 19 _0. The movable punch 19, the cutting edge 19 ₀ of the distal end portion is fixed to the bottom plate 18 of the stripper 17 is protruded downward by a predetermined length H from the lower end surface of the stripper 17.

The movable punch 19, the projecting length H of the cutting edge 19 ₀ is set to a length of half die a thin plate workpiece, and the width length of the cutting edge 19 ₀ cutting unit (e.g. diagram workpiece 5 is substantially the same as the width of the connecting portion 32). The first vertical surface 19 ₁ of the movable punch 19 is in contact with the first vertical surface 15 ₁ of the pressing punch 15.

In the lower mold 20, a die 22 is fixed to the upper surface of the lower mold base plate 21 by a die holder 23. Die 22 has a mounting portion 22 _A, and a cutting edge portion 22 _B provided on the upper end of the attachment portion 22 _A, and is formed from steel. The die 22 consists of longitudinal section is rectangular forms a plate-like member, the mounting portion 22 _A is mounted to a mounting hole 23a formed in the die holder 23. Further, the die 22 has a first vertical surface 22 ₁ positioned on the inner side, and a ₂ second vertical surface 22 located outside the cutting edge portion 22 _B includes the first upper extreme of the vertical plane 22 ₁ None the wedge having an inclined surface 22 _3, which is cut at an acute angle toward the second vertical surface 22 _2, has its distal end and cutting edges 22 _0. Width length of the cutting edge 22 ₀ is in a substantially same length as the width dimension of the cut portion of the workpiece (e.g., coupling 32 of FIG. 5).

In assembly of the upper and lower molds 11, 20 are assembled such that the first vertical surface 19 ₁ of the movable punch 19 is in sliding contact with the first vertical surface 15 ₁ of the pressing punch 15. By thus first vertical surface 19 ₁ of the movable punch 19 is in sliding contact with the first vertical surface 15 ₁ of the pressing punch 15, the movable punch 19 during sheet punching device 10 used is lowered workpiece Since the movable punch 19 is pressed against the pressure punch 15, a high load is applied to the pressure punch 15, so that the movable punch 19 does not move because the pressure is applied to the pressure punch 15. The member to be processed can be accurately half cut. Further, it is possible to prevent breakage of the cutting edge 19 ₀ of the movable punch 19. Further, the movable punch 19 and the die 22 is assembled such that the outer surface 22 _C of the first vertical surface 19 ₁ and the die 22 of the movable punch 19 is positioned on the same straight line. By this assembly, the workpiece is positioned by the die 22 and half-punched by the movable punch 19 and then punched by the pressure punch 15, so that the punching by the pressure punch 15 can be performed accurately. A method of using the thin plate punching apparatus 10 will be described in the following steps.

The thin plate punching apparatus 10 is installed and used in a production line that employs a so-called progressive feed method that feeds and processes thin plates as workpieces.
Hereinafter, with reference to FIGS. 1-8, the usage method of the thin plate punching apparatus 10 in the process of manufacturing the center pin which is one of the built-in parts of a battery as an example of a process part is demonstrated. 3 is a flowchart showing a processing step in which the thin plate punching apparatus of FIG. 1 is used, FIG. 4 is a schematic perspective view showing a state in which a center pin is inserted into the battery, and FIG. 6-8 is explanatory drawing explaining the processing condition of the thin plate in a processing process.
The center pin P is disposed at the trace where the positive electrode plate and the negative electrode plate of the battery C have been removed from the winding shaft of the electrode body S wound using the winding shaft via the separator.

As shown in FIG. 3, the processing process of the center pin P includes a thin plate to be processed, more specifically, a development frame punching process I for punching a development frame forming a predetermined part from the hoop material, a hoop material. _A groove forming step II for forming a notch groove in the coupling portion 32 between the carrier portions 30 _A and 30 _B and the development frame 31; a product processing step III for bending the development frame 31 into a predetermined shape; and a coupling portion 32. It has a punching process IV for shearing. In this process, the thin plate punching apparatus 10 is used in the punching process IV.

The details of this processing step will be described below with reference to FIG. First, in the unfolding step I of the unfolded frame, the unfolded frame 31 for forming the center pin P is punched from the hoop material 30 having a predetermined width and thickness (for example, 0.15 mm) using a not-shown pressing device. The This punching, the hoop member 30 has a punching portion 30c, and the upper and lower carrier section ₃₀ A, 30 of _B, and a development frame 31, coupling portions 32 and the development frame 31 and the carrier unit ₃₀ A, 30 _B (See FIG. 5A). In FIG. 5, the development frame 31 is a part where the center pin P is formed.

In the next groove forming step II, notched grooves 32 _A and 32 _A are formed at predetermined positions of the coupling portions 32 and 32. Each notched groove 32 _A, 32 _A, so has the same structure, the following description will only one notched groove 32 _A. Further, the notched groove 32 _A is the back side (more particularly coupling portion between the development frame 31 and the coupling portion 32) shown in FIG. 5 (c) the coupling portion 32 is formed.

FIG. 5C is a cross-sectional view illustrating a back surface of the coupling portion in FIG. 5B, and FIG. 5D is a cross-sectional view illustrating a cross section taken along the line AA in FIG. The coupling portion 32, notched groove 32 _A angle-shaped inverted triangle which is a 60 to 120 ° of the bottom using a cutter mechanism (not shown) is formed. This angle is set in relation to the blade edge angles of the pressure punch 15 and the movable punch 19, and is preferably 120 ° when the blade edge angles of the pressure punch 15 and the movable punch 19 are 60 °. . When set to the angle, at the time of driving of the respective punches 15, 19, abuts the bottom of the cutting edge easily notched groove 32 _A of the punches 15 and 19, moreover, the coupling portion 32 by cutting edge 15 ₀ and 19 ₀ displaces In this way, the amount of forming the recess, that is, the so-called push-out amount is reduced. As a result, it is possible to improve the life and durability of the cutting edge 15 ₀ and 19 _0. The depth of the notched groove 32 _A are preferably mechanical strength of the hoop material 30 is a depth that does not decrease. Since the notched groove 32 _A formed only on one surface of the coupling portion 32, and decreases the mechanical strength of the coupling portion 32, that in the course of processing as in the prior art deviates from the carrier unit 30 _A, 30 _B Absent.

  In the product processing step III, the developing frame 31 is bent and processed into a center pin shape by a processing device (not shown) (see FIG. 5B).

In the punching process IV, the coupling portion 32 is punched and sheared by the thin plate punching apparatus 10. Specifically, first, the carrier portions 30 _A and 30 _{B of} the hoop material 30 from which the development frame 31 is punched are positioned and fixed on the lower mold 20. The positioning and fixing, as shown in FIG. 6 (a), is positioned and fixed to the point where the cutting edge 22 ₀ die 22 of the lower die 20 is positioned just below the bottom of the notched groove 32 _A. Next, after this positioning and fixing, the upper mold 11 is actuated by a drive mechanism (not shown) and descends. By lowering the upper mold 11, pierce edge 19 ₀ of the movable punch 19 to the bottom of the notched groove 32 _A, pierce edge 22 _0. coupling portion 32 of the die 22 by the pressing force of the coupling portion 32 by the movable punch 19 Then, half-cutting is performed (see FIGS. 6B and 6C). At this time, the cutting edges ₁₉ 0, 22 ₀ of the die 22 and the movable punch 19 pierces up to approximately 2/3 of the plate thickness. By half-cutting, the development frame 31 is formed with a predetermined angle of sagging at upper and lower corners (see FIG. 8).

Coupling portion 32 to form a pre-notched groove 32 _A to, by half blanking the locations, the load applied to the movable punch 19 is reduced. That is, when the cutting edge 19 ₀ of the movable punch 19 is driven into the cutout groove 32 _A, the inclined surface 19 ₃ of the movable punch 19 abuts against the side surface of the notched groove 32 _A, but compresses the side surfaces, the amount of this compression less as indicated by the shaded shown in FIG. 6 (c) by forming a pre-notched groove 32 _a. Note that when not provided notched groove 32 _A, the amount of compression is increased as shown in oblique lines in FIG. 6 (d). The area of the shaded portion is a biting resistance portion of the movable punch 19. Therefore, if this biting resistance is reduced, half punching by the movable punch 19 is facilitated, and its durability is improved. By smoothing this half-cutting, the effect of suppressing the generation of burrs is exhibited. Also, the load on the pressure punch 19 is reduced.

Next, a driving mechanism (not shown) is operated to lower the pressure punch 15. The pressing punch 15 is lowered while sliding a first vertical surface 19 ₁ of the movable punch 19, the cutting edge 15 ₀ abuts against the sagging portion of the upper expansion frame 31. When the pressure punch 15 is further lowered from the abutted state, a portion half-extracted by the movable punch 19 and the die 22 is sheared. Therefore, the sheared cross section has no burrs.

  According to the thin plate punching apparatus 10 having such a configuration, it is possible to create the center pin P having no burr on the outside and the inner surface side. Therefore, even if the center pin P is inserted into the electrode body S at the time of assembling the battery, there is no possibility that the electrode body S is damaged by being caught by the electrode body S. Of course, the use of this apparatus eliminates the need for secondary processing, such as barrel processing, performed in the prior art. Furthermore, by installing and using the thin plate punching processing apparatus 10 of the present invention in a progressive feed production line, it is possible to improve productivity with a low-priced device compared to a processing device employing a multi-forming method. Become.

  The manufacturing method and apparatus of the present invention can also be applied to burr suppression at a circular cut end such as a cylindrical can. That is, when the cylindrical can is processed by deep drawing, an ear is formed at the circular opening of the cylindrical can, but the ear is cut off between the ear and the cylindrical can body by the same processing method as described above. It is possible. At this time, it is preferable to cut with a notch groove between the ear portion and the cylindrical can. Then, a punching apparatus is used in which the pressure punch 15, the movable punch 19, the die 22 and the like are shaped in accordance with the shape of the circular punching portion of the cylindrical can to be processed.

FIG. 1 is a partial longitudinal sectional view of a thin plate punching apparatus according to an embodiment of the present invention. FIG. 2 is an enlarged cross-sectional view of a portion X in FIG. FIG. 3 is a flowchart of processing steps in which the thin plate punching apparatus of FIG. 1 is used. FIG. 4 is a schematic perspective view showing a state in which the center pin is inserted into the battery. FIG. 5 is a diagram showing a process for processing the hoop material. FIG. 6 is an explanatory diagram for explaining the machining state of the workpiece in the punching process. FIG. 7 is an explanatory diagram for explaining the machining state of the workpiece in the punching step after FIG. FIG. 8 is an explanatory view for explaining the machining state of the workpiece. FIG. 9 is a schematic cross-sectional view of a conventional thin plate punching apparatus. FIG. 10 is a cross-sectional view for explaining a processing process of another conventional battery electrode plate cutting die.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Thin plate punching processing apparatus 11 Upper mold | type 12 Upper mold | type base plate 15 Pressure punch 17 Stripper 18 (Stripper) Bottom plate 19 Movable punch 20 Lower mold | type 21 Lower mold | die 22 Die 23 Die holder

Claims (5)

A thin plate punching method comprising the steps shown in the following (a) to (c).
(A) a step of positioning and fixing a thin plate as a workpiece to the die 22;
(B) A movable punch and a pressure punch that are slidably contacted with each other, wherein the movable punch includes a cutting edge portion sharpened at an acute angle from an edge of the surface on the pressure punch side, and the pressure punch Uses a blade having a sharp edge from the edge of the surface of the movable punch side, and drives the sharp edge of the movable punch into the surface facing the die through the thin plate. Half-punching the thin plate with the die;
(C) The cutting edge sharpened to the acute angle of the pressure punch from one side of the movable punch in a state where the sharp cutting edge of the movable punch is in contact with the half-cut thin plate The process of punching by pressing against a half-punched part of a thin plate.   Before the step (b), a notch groove is formed on the surface of the thin plate into which the movable punch is to be driven, and the movable punch is driven into the portion where the notch groove is provided in the step (b) to half-punch. The thin plate punching method according to claim 1, wherein:   The thin plate punching method according to claim 2, wherein the notch groove is formed in a V shape and an angle of a bottom portion thereof is in a range of 60 ° to 120 °. A first die provided with a die and a second die provided with a pressure punch and a stripper for punching a thin plate in cooperation with the die, and at least one of the first and second die is driven In a thin plate punching apparatus that is connected to a mechanism and punches the thin plate that is a workpiece between the die and the pressure punch,
The second mold is provided with a movable punch for half-pulling the thin plate on the stripper, and the movable punch has a cutting edge pointed at an acute angle from an edge of the surface on the pressure punch side, The movable punch is provided with a blade edge pointed at an acute angle from the edge of the surface on the movable punch side. The movable punch and the pressure punch are slidably contacted with each other, and the movable mechanism moves the movable punch. After the punch is actuated and the thin plate is half-punched by the die with the sharp edge of the movable punch and the die, the pressure punch is actuated by the drive mechanism to sharpen the acute angle of the pressure punch. An apparatus for punching a thin plate, wherein the cutting edge portion is pressed against a half punching portion of the thin plate to punch the half punching portion .   The thin plate punching apparatus according to claim 4, wherein a surface of the movable punch on the side of the pressure punch and an outer surface of the die are positioned on the same straight line.

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