JP2000140953A - Method for press forming of sheet metal and its forming die - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for the press forming of a sheet metal and its forming die by which a correct drawing can be performed to a definite worked part where the sheet metal has been worked by a progressive die even when for a material to which the tolerance of an interval of pilot holes can not be sufficiently made small, the pilot holes are provided apart from the forming die, and its accumulated tolerance becomes large. SOLUTION: When drawing is performed successively by press forming while feeding pitch by pitch by a progressive die a long size sheet metal 1 on which reference holes 12 have been provided at even intervals on side edge parts along the longitudinal direction, a slitting process P1 is performed at least once, which separates partially a forming part 13 on the basis of the reference holes 12 from the sheet metal 1, leaving connection parts 15. Next, the first drawing process P4 of the drawing, is performed on the basis of the reference holes 12a on both sides of a working part 13, and working on and after the second drawing P5 of the drawing, is performed on the basis of a recessed part 17 formed by the first drawing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet metal press for forming a sheet metal having a pilot hole as a reference hole in advance, such as forming the sheet metal by progressively increasing the drawing depth while sequentially feeding the sheet one pitch at a time. It relates to a molding method. More specifically, the present invention relates to a sheet metal press forming method capable of performing press forming accurately by progressive feeding even when the tolerance of the interval between pilot holes formed in the sheet metal is relatively large or the accumulated error is large, and a mold for manufacturing the same. .

[0002]

2. Description of the Related Art When drawing a sheet metal, if a deep drawing is formed at a time, the sheet material is broken and cannot be formed. Used. Conventionally, as a press forming method using a progressive die, there is a method of processing with a pilot hole as a reference in each forming portion based on a reference hole (pilot hole) provided on a side thereof, and without using a pilot hole, There is a method in which a molded portion is supported by a carrier and a bridge, and the molded portion is deformed to form the molded portion based on a concave portion formed by drawing.

In the former method, a sheet metal is formed by feeding a sheet metal one pitch at a time, and a pilot hole is formed. In this method, the interval between the pilot holes becomes constant due to the processing of the mold, and further, new pilot holes are sequentially drilled in a state where the pilot holes are positioned in the molding die which is sequentially fed. Accumulation of tolerances does not cause accumulation of errors related to pilot holes in the initial drawing step and the final drawing step.

In the latter method, as shown in FIG. 5, a peripheral portion L of a portion K to be formed is punched out with reference to a pilot hole, and the processed portion is held at a connection portion of a carrier and a bridge. After performing the first drawing, a subsequent forming process such as the second drawing is performed through a necessary play portion or the like, while feeding one pitch at a time based on the concave portion M formed by the first drawing. Note that the pilot hole is formed at a position apart by the feed pitch on the right side in FIG. 5 with respect to the pilot hole at the time of the first punching for forming the carrier and the bridge. The play portion is provided when it is not possible to continuously form a forming punch or die.

On the other hand, for example, in the case of storing a lithium ion secondary battery, the lithium ion secondary battery has a high battery energy density, and when subjected to erroneous operation or abnormal high temperature environment, the sealing internal pressure rises abnormally. Explosion may damage battery-equipped equipment or cause harm to humans. Therefore, as shown in the public information of Japanese Patent Application Laid-Open No. 9-223490, as shown in FIG. 6, the cover 50 is provided, a through hole 52 is formed in a metal plate, and a metal foil is attached to the entire back surface of the metal plate. A material having a safety valve 51 is developed such that the metal foil in the hole ruptures when the pressure increases, and such a safety valve 51 is attached to the hole provided in the cover 50 of the battery case by welding or the like. Things are disclosed.

[0006] Since bonding a safety valve made of a material obtained by laminating a metal plate and a metal foil to the hole of the lid of the container one by one requires a lot of man-hours and increases costs, the above-mentioned safety valve is provided. It is conceivable to form the cover of the battery case directly from the metal plate. However, in order to form a sheet metal provided with such an explosion-proof window (safety valve), it is necessary to draw the above-mentioned explosion-proof window so that the above-mentioned explosion-proof window is a portion not affected by the drawn portion (the center of the lid). And a pilot hole aligned with the explosion-proof window is formed. The hole spacing of the pilot holes is formed so as to fall within a certain tolerance. However, as described above, since this is a bonded plate of a metal plate and a metal foil, it is necessary to sufficiently reduce the tolerance. Can not. Moreover, unlike the pilot hole formed by the progressive die described above, only the pilot hole interval is formed in accordance with the interval of the explosion-proof window separately from the molding die. If the forming process is attempted, the gap due to the cumulative tolerance of the hole gap will increase as the processing process such as the drawing process progresses, and a large gap will occur between the first process and the last stage of progressive forming, making it difficult to align. Thus, molding using a progressive die cannot be performed.

[0007]

As described above, a multi-stage molding using a progressive die is performed on a sheet metal which is previously processed such as an explosion-proof window and has a pilot hole formed in advance with reference to the processed portion. If processing is attempted, the positional shift becomes a problem as the forming process proceeds, and the forming cannot be performed.

The present invention has been made in order to solve such a problem, and a pilot hole is provided separately from a material or a molding die in which the tolerance of the pilot hole interval cannot be sufficiently reduced. Provided is a sheet metal press forming method and a forming die capable of performing a forming process such as an accurate drawing process on a fixed portion already formed on a sheet metal by a progressive die even when a tolerance becomes large. With the goal.

Another object of the present invention is to provide a method for manufacturing a sealed battery container lid for easily manufacturing a lid having an explosion-proof window for a container for accommodating a secondary battery which may explode.

[0010]

A sheet metal press forming method according to the present invention is characterized in that a long metal plate having reference holes provided at equal intervals on a side edge along a longitudinal direction is formed in a progressive die at a pitch of one pitch. A sheet metal press forming method for feeding and drawing sequentially by press forming, wherein a punching process for partially separating a forming portion from the metal plate except for a connection portion with respect to the reference hole is performed at least once. Then, the first drawing process of the drawing process is performed with reference to the reference holes on both sides of the processed portion, and the processes after the second drawing of the drawing process are performed on the concave portion formed by the first drawing process. It is characterized in that it is performed as a reference.

Here, the reference hole means a hole provided at a constant pitch which can be used for positioning in a molding process or the like, and is a so-called pilot hole. Also, the connection means a so-called carrier or bridge part,
It means the part that holds the molded part. Furthermore, in addition to the so-called bite processing that cuts without a cutting white, so-called slit processing with a cutting white,
This means a process of cutting the formed part from the metal plate except for the connection part so that the material is easily deformed during drawing or the like.

According to this method, even when the tolerance of the interval between the reference holes of the metal plate is large or the accumulated tolerance becomes large and the processing position shifts in the progressive die, the metal plate is removed in the first drawing step. The first drawing can be performed at an accurate position by stretching or bending, and the subsequent drawing process can be positioned by deformation of the connection part connecting the processing parts. Even if such a processed portion is formed, it is possible to perform the drawing process accurately positioned at that position.

A first positioning pin of a mold inserted into the reference hole for positioning the metal plate for performing the slit processing; and a positioning pin for positioning the metal plate for performing the first drawing. When the distance between the second positioning pins of the mold inserted into the reference hole and the distance between the reference holes of the metal plate into which the first and second positioning pins are inserted does not match, the metal plate is bent. By performing the alignment by pulling or pulling, accurate alignment can be performed even if the accumulated tolerance of the reference holes of the metal plate becomes large.

As described above, the sheet metal press forming method of the present invention using the progressive die, which has a reference hole already provided and sequentially performs press forming without drawing, is performed based on the reference hole and the reference hole. By performing slit processing on the periphery of the forming part, the reference hole and the forming part are held by a narrow connection part, and the forming to be performed sequentially is positioned by the reference hole near the forming part to perform forming. The respective molding processes are performed from

According to this method, even in the press forming process using a progressive die that does not include the drawing process, the slit is formed in advance and the formed portion is held by the thin connecting portion. Even if it is set in the mold, the distance between the reference holes is corrected by the deformation of the connection portion. In addition, if positioning is performed by three reference holes adjacent to the first stage of the press forming process, the interval between the reference holes is accurately corrected at that portion, and even in the final processing step, there is no large displacement caused by cumulative intersection. Preferred.

The above-mentioned metal plate is made of a material for laminating a metal plate and a metal foil, and is made of a long metal plate provided with explosion-proof windows and reference holes regularly. By performing a drawing process or a forming process such as a crushing or drilling process, a sealed battery container lid is obtained.

The press-molding die according to the present invention is a progressive metal die having a blanking portion for cutting a processed portion of a plate material while leaving a part of a connection portion and a plurality of formed portions for sequentially performing press forming at a constant interval. A mold, wherein a first positioning pin capable of being fitted into a reference hole of the plate material is provided in at least a part of the blanking portion in a cavity mold or a core mold, and an initial stage machining of the molding portion is performed. A second positioning pin that can be fitted into a reference hole of the plate material is provided in the cavity die or the core die, and the cavity die and the core die are joined between the first and second positioning pins. A relief portion for bending the plate material is formed on at least a part of the surface.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the sheet metal press forming method and the forming die of the present invention will be described with reference to an example of a method for manufacturing a closed battery container lid.

First, as shown in FIG. 1, a press-forming die according to the present invention has a sheet material 1 as shown in a cross-sectional view of a joint between a cavity die (lower die) 2 and a core die (upper die) 3. A punching processing section A for cutting the molding processing section while leaving a part of the connection section;
Multiple drawing parts and squeezing processing to sequentially increase the drawing depth,
A first positioning which has a forming process (drawing process) portion B for sequentially performing a forming process of a hole forming portion or the like at a constant interval, and is capable of fitting at least a part of the punching portion A with a reference hole of the plate material. A pin 25 is provided in the cavity mold 2, and a second positioning pin 26 that can be fitted into the reference hole of the plate 1 is provided in the first molding (drawing) part of the molding part B.
And the first and second positioning pins 25, 26
Relief portions 29 and 39 for bending the plate material 1 are formed on at least a part of the joint surface between the cavity mold and the core mold. In addition, C is a final finishing process unit that performs a drilling process and the like.

That is, this press forming die includes a cavity die 2 and a core die 3, and a slitting metal plate (plate material) 1 fed between the dies 2, 3 is formed by slitting. In addition, forming processes such as drawing processes are performed simultaneously. The dies 2 and 3 are opened and closed by a drive mechanism (not shown), and the metal plate 1 is accurately fed one pitch at a time by a feeder (not shown).

The plate material (metal plate) 1 to be formed is shown in FIG.
As shown in the above, for example, explosion-proof through holes are formed at regular intervals in an aluminum plate having a thickness of about 0.4 μm,
An aluminum foil having a thickness of, for example, about 0.02 μm is adhered to the back surface by a roll rolling method or the like, and the through hole is closed by the aluminum foil to form an explosion-proof window 11. A reference hole (hereinafter, referred to as a pilot hole) is provided on the side of the explosion-proof window 11 at an equal interval in accordance with the interval of the explosion-proof window 11.
12 are formed on both sides. In addition, this metal plate 1
Of the explosion-proof window 11 is 17mm
It is about. Before press forming, only the explosion-proof window 11 and the pilot hole 12 are formed at a fixed interval as shown on the left side of FIG. 2, and the molds shown in FIG. Deeper drawing is performed as it is sent and goes to the right.

The cavity mold 2 supports the metal plate 1 flat during the molding with the core mold 3, and has a die (a punch and a slide to be described later) for punching (forming a cut portion) a plurality of times. 21 and 22, and a first drawing die 23 and a third drawing die 24 for performing a plurality of drawing processes (other dies such as a second drawing die are omitted in the drawing). Is formed. Each of these dies 21 to 24 is a metal plate 1
Are formed in order in the feeding direction a, and are arranged at the same interval as the interval L of the pilot holes 12 of the metal plate 1 (or at intervals of the pitch). In the dies 23 and 24 of the drawn portion, there are cases where the metal plate 1 drawn by a punch described later cannot be removed from the dies 23 and 24, and therefore, a push-up pin (not shown) is provided. . In the cavity mold 2, a first positioning pin 25 for positioning the metal plate 1 by using the reference hole is provided at a position where the first slit processing is performed. It is provided on both sides of the first drawing die of the processing part B. Although these positioning pins 25 and 26 are shown as one and two in the figure, they are present on both sides of the metal plate so that they can be positioned on both sides. These dies are held by a die holder 28 to form a cavity mold (lower mold).

The mold of the present invention is characterized in that relief portions 29 and 39 capable of absorbing the bending of the metal plate 1 are formed on the joint surface between the cavity mold 2 and a core mold 3 described later. . That is, the first and second positioning pins 2
5 and 26, the first slitting and the first drawing are performed to position the metal plate with reference to the pilot hole 11. As described above, the distance between the pilot hole 11 and the positioning pins 25 and 26 of the mold are determined. Intervals often do not match. Therefore, if the distance between the metal plates 1 is larger, the metal plate 1 bends, and the escape portions 29,
39 are formed. The relief portions 29 and 39 are not formed in the cavity mold 2 at the portion to be machined, but are provided on the core mold 2 side or at a portion where no machining is performed (a play section).

The core mold (upper mold) 3 is provided with punches 31 and 32 corresponding to the dies 21 and 22 for punching the cavity mold 2 described above. , 24 corresponding to the first and second aperture punches 33 and 34, respectively, and comprises a stripper 37 and a punch holder 38 for separating the punch from the metal plate 1. In addition, an extrusion pin for removing the punch biting into the metal plate is also provided inside the punch of the drawing portion, but is not shown. And, as described above, the escape portion 39 for absorbing the bending of the metal plate 1 is provided. In the core mold 3, the small relief portions 39 are also formed in the drawn portions after the first drawn and after the second drawn.
Are formed. In this section, the metal plate 1 does not bend due to the positioning pins of the mold, but as described above, the positional deviation increases due to the accumulation of the intersection of the intervals, so that the deformation at the connecting portion described later increases, An escape portion 39 is formed as a place where the deformation escapes. Although the relief 39 in the drawn portion cannot be formed too deeply,
Since the deformation in the forming process B is a deformation of the carrier portion and the like outside the connection portion such as a bridge as described above, it is similar to the punching portion A outside the processing area of the metal plate 1 (side side). Is formed, and is indicated by a broken line in FIG. As a result, the core mold 3 is closed and the positioning pins 25 and 26 of the cavity mold 2 are closed.
In addition to sequentially performing slitting and drawing a plurality of times around each explosion-proof window 11 of the metal plate 1 positioned in the step 1, the portion of the processed metal plate 1 that is bent during the forming process is absorbed.

Next, the method of performing the sheet metal press forming of the present invention using the press forming die (the method of producing a closed battery container lid) will be described in further detail.

First, as described above, the metal plate 1 in which the explosion-proof windows 11 and the pilot holes 12 are formed at equal intervals is inserted from the left side of the above-mentioned molding die and is fed one pitch at a time.
Then, the first positioning pin 25 of the mold is inserted into the pilot hole 12 of the metal plate, and the core mold 3 is lowered and fixed.
By lowering the punch 31 for cutting, the forming area 13 around the explosion-proof window 11 is cut except for the connection part (bridge) 15 as shown at P1 in FIG. Is subjected to a first punching process.
That is, the forming area 13 is held only by the connecting portions 15 called bridges or carriers.

Next, the core mold 3 is raised, and the metal plate is moved by one pitch. In this case, the mold does not have a molded portion and is free. This is provided when punches and dies cannot be continuously formed at a narrow pitch interval. This state is the state shown by Q1 in FIG. 2, and the processing state is the same state as P1. Next, metal plate 1
Are shifted by one pitch, and a molding process is performed in the same manner. In this step, as shown at P2 in FIG. 2, the second punch 32 and the second punch 32 are formed so that the second cut portion 16 is similarly formed on the outer periphery of the cut portion 14 other than the connection portion 15. It is formed by the second die 22. As a result, the explosion-proof window 11
Forming area 13 around the two cutting portions 14, 1
6 and held by the connecting portion 15 to increase the degree of freedom of deformation. When the metal plate 1 is further advanced by one pitch, the metal plate 1 is located at the play portion of the mold, and the processing state does not change as indicated by Q2 in FIG. Even if the pitch is further fed by one pitch, the play portion Q3 is similarly formed. This completes the punching process A. In addition, the feeding of the processed metal plate 1 at a pitch is
The feeding device (not shown) performs the operation based on the feeding pitch of the pilot holes 12.

Further, when the sheet is advanced by one pitch, the first forming area 13 of the metal plate comes to the position of the first drawing punch 33 and the first drawing die of the die. Here, four second positioning pins 26 provided in the cavity mold 2 are fitted into the pilot holes 12a around the molding processing area 13 for positioning. At this time, if the position of the metal plate 1 positioned by the first positioning pin 25 and the position of the metal plate 1 positioned by the second positioning pin 26 do not match, the metal plate 1 is fixed at both positioning portions,
In the case of bending, the reliefs 29 and 39 provided at the joints of the molds absorb the bending, and in the case of tension, the metal plate 1 is stretched to extend the two molds. The first drawing process is performed by pinching by 2 and 3 (see P4 in FIG. 2).

Further, the sheet is fed one pitch at a time, and the drawing process is sequentially repeated, and the second drawing (P5), the third drawing (P6), and the texture (P7) for final molding are performed. And
Thereafter, there is a play step (Q4), and the drawing step B is completed.

Thereafter, the sheet is fed one pitch at a time, is pressed through a plane (P8), punches a hole 18 (P9), plays a play (Q5), and removes the outer diameter (P10), thereby obtaining a sealed battery container lid. Can be The completed lid is shown in a perspective view in FIG. Reference numeral 18 denotes a hole for extracting one electrode of the battery to the outside via an insulator.

In the above description, one processing portion is described step by step. However, if molding is performed by a die in one step, the processing of the same preceding step is performed simultaneously in a portion immediately before the die. In this case, as shown in FIG. 2, the processing in all the steps is performed at once, and the processing is continuously performed one after another.

According to the press forming method of the present invention, for example, a pilot hole is formed along with a certain processing such as an explosion-proof window, and furthermore, the above-mentioned processing is performed using a plate material having a large interval tolerance or a large accumulated tolerance. Even in the case where drawing or the like must be performed by progressive feeding on the basis of the portion, the forming process by the progressive die can be performed sequentially and continuously in accordance with the processed portion while using the pilot hole. In this case, since the escape portion is formed at the joining portion of the mold, when the interval between the reference holes of the plate material is wide, the metal plate can be bent to perform the respective alignments sufficiently. Further, when the interval between the reference holes of the plate is narrow, the plate is stretched by a pulling force acting on the plate, so that two positions can be secured. Further, after the first drawing is performed, since the forming area is held only by the narrow connection portion (bridge) by the punching by performing with reference to the concave portion formed by the drawing, that portion is formed. Can sufficiently correct the displacement.

Further, according to the method of manufacturing the sealed battery container lid of the present invention, it is not necessary to separately attach a safety valve, which is an explosion-proof window, to the lid formed by drawing separately, thereby increasing the number of steps. Since it can be easily manufactured only by a series of molding processing steps without using it, it can be obtained at very low cost.

Also, by using the mold of the present invention,
The above-described press molding can be performed, and the drawing process can be performed in accordance with the position of the explosion-proof window even with the lid of the sealed battery container.

In the above example, the metal plate is thin, and the lid of the battery container is formed into a box shape by drawing. However, depending on the type of battery, a thick metal plate of about 1 mm is used. As shown in FIG. 6, a material that is not drawn is also used. In the lid having such a structure, the recess formed by the first aperture cannot be used as a reference. The example shown in FIG. 4 is a diagram showing a press molding method in such a case. That is, using a metal plate 40 on which an explosion-proof window 41 or the like has been subjected in advance and a pilot hole 42 is formed corresponding to the explosion-proof window 41, press-forming while sequentially feeding one pitch by a progressive die. Is what you do. The metal plate 40 is made of aluminum or the like having high ductility, and is a hoop material having a thickness of about 1 mm and a width of about 30 to 50 mm. And the pilot hole 41 has a diameter of about 4 mm,
The distance from the end of the side to the center thereof is about 3 mm.

FIG. 4 is a view showing the same process sequence as FIG.
Although the play portion is not shown in this figure, a play step can be appropriately included as in the above-described example. First, the metal plate 40 is positioned by the pilot hole 42a, the first slit 44 is formed by punching, and the stepping of the processing area 43 is performed (P1). As shown in the cross-sectional view of FIG.
Is pressed down by about 0.4 to 0.5 mm to form a radius (R) on the rear surface side, and when the final outer diameter is removed, a radius portion is formed on the outer periphery on the rear surface side. This is to make it easy to put in a box. Further, in the present invention, the following functions are also provided by this step processing. In FIG. 4, when the pilot hole 42a, the explosion-proof window 41, and the stepped portion are integrated (made rigid), and the bridge 46 and the carrier 47 described later deform, the positional relationship between the pilot hole 42a and the explosion-proof window 41 changes. It becomes difficult, and resistance of escape (plastic flow) of the material crushed in the concave portion 48 occurs, so that sagging of the ridge is eliminated, and the shape of the crushed shape is improved.

Next, a second slit 45 is formed by feeding one pitch and then punching, and a thin bridge 4 is formed.
6 and the carrier 47 are formed (P2). Since this punching does not require much accuracy, the pilot hole 4
There is no effect whether or not the positioning by 2 is performed.

Further, one pitch feed, pilot hole 4
Positioning is performed by 2b, crushing is performed by press molding, and a concave portion 48 is formed (P3). The formation of the concave portion 48 is deformed by crushing, not pressing down. If the pitch of the mold and the pitch of the pilot hole 42 of the metal plate 40 do not match with the alignment of the first punching at the time of this alignment, the bridge 46 and the carrier 47 may be bent or stretched. Are combined. Therefore, it is preferable that the escape portion is formed on the joining surface of the mold as described above. In addition, the positioning at the time of this forming is performed not only by the pilot hole 42b corresponding to the processing area, but also by positioning of the pilot hole adjacent to or adjacent to the pilot hole 42b, so that the interval between the pilot holes 42 becomes the bridge 46 and the carrier 47 (connection portion). Therefore, even if the number of forming steps thereafter is increased, the error between the pilot holes 42 is eliminated, which is preferable. In particular, if the positioning is performed using three adjacent pilot holes 42, the interval between the pilot holes can be completely corrected. The depth of the concave portion 48 is formed to a depth of about 0.5 mm, and is used as a portion for accommodating an insulating material for insulating a battery electrode lead described later.

Thereafter, an additional one-pitch feed hole is formed, and the diameter of the one electrode of the battery is set at 2.
A hole 49 of about 5 mm is formed (P4). Thereafter, the outer shape is further removed by one pitch feed (P5), whereby the explosion-proof window 41 is formed at the center, for example, 5.2 mm.
A lid of a battery container having a size of about 32.9 mm and a concave portion 48 and a hole 49 having the above-described depth is formed.

According to this method, even if a concave portion is formed by stepping or crushing, the concave portion is shallow and cannot be used as a reference for alignment. However, by performing slit processing, forming a narrow connection part by a bridge or a carrier, inserting a positioning pin into the pilot hole during molding processing and positioning the pilot hole, the gap between the pilot holes formed in advance. Can be modified to correspond to the spacing of the positioning pins of the molding die,
As a result, even when the forming process is performed sequentially using the progressive die, it is possible to perform the forming process that is aligned with a previously formed portion such as an explosion-proof window.

[0041]

According to the present invention, even a plate material which has been partially processed in advance and has a pilot hole formed therein, can be subjected to multi-stage press forming with high precision by progressive feeding. Further, even when a material such as a plate material in which a metal plate and a metal foil are bonded to each other is used, the distance between the reference holes is difficult to be constant, the press forming can be accurately performed.

Further, when the lid for a battery container is formed by the method of the present invention, a large amount of the explosion-proof element can be formed at a time by a series of press forming using a progressive die without the need to provide an explosion-proof element by welding or the like later. Can produce,
Very cost reduction can be achieved.

[Brief description of the drawings]

FIG. 1 is an explanatory cross-sectional view of a joint between an upper die and a lower die according to an embodiment of the press-molding die of the present invention.

FIG. 2 is an explanatory plan view of a metal plate showing each forming step of one embodiment when a battery container lid having an explosion-proof window is manufactured by multi-stage forming.

FIG. 3 is a perspective view of a completed molded product of the lid of FIG. 2;

FIG. 4 is an explanatory plan view of a metal plate showing each forming step of another embodiment when manufacturing a battery container lid having an explosion-proof window by multi-stage forming.

FIG. 5 is an explanatory view of an example of a conventional manufacturing method using a progressive die.

FIG. 6 is an explanatory view of a lid of a conventional sealed battery container.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Metal plate 2 Cavity mold 3 Core mold 11 Explosion-proof window 12 Pilot hole 13 Molding part 15 Connection part 17 Depressed part by 1st drawing 25 First positioning pin 26 Second positioning pin 29 Escape part 39 Escape part

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Meio Ohira 326-2 Hirano, Hirano, Wadayama-cho, Asago-gun, Hyogo Pref. Metal foil powder industry Co., Ltd. (72) Inventor Akira Takagi 20 Fukuda metal foil powder industry Co., Ltd. Fukuda 20 Nishinoyama Nakashincho, Yamashina-ku, Kyoto (reference)

Claims (7)

[Claims] 1. A sheet metal press for feeding a long metal plate having reference holes formed at equal intervals in side edges along a longitudinal direction into a progressive die one pitch at a time, and sequentially performing drawing by press forming. In a forming method, a forming process is performed at least once by partially separating a forming process portion from the metal plate while leaving a connection portion based on the reference hole, and then a first drawing process of the drawing process is performed. A sheet metal press forming method, characterized in that the drawing is performed with reference to the reference holes on both sides of the processed portion, and the drawing after the second drawing is performed with reference to a concave portion formed by the first drawing. 2. A first positioning pin of a mold inserted into the reference hole for positioning the metal plate for performing the punching, and a positioning of the metal plate for performing the first drawing. Of the mold to be inserted into the reference hole
If the distance between the positioning pins does not match the distance between the reference holes of the metal plate into which the first and second positioning pins are inserted, the metal plate is bent or pulled to position on the positioning pins. 2. The molding method according to claim 1, wherein the joining is performed. 3. A sheet metal press for feeding a long metal plate having reference holes formed at equal intervals in a side edge portion along a longitudinal direction into a progressive die at a pitch and sequentially forming the same by press forming. A forming method, wherein the reference hole and the forming portion are slit by forming a slit around the reference hole and the forming portion with reference to the reference hole, and the forming process is performed sequentially. A sheet metal press forming method, wherein positioning is performed by the reference hole near a forming portion where forming is performed, and then each forming process is performed. 4. A long metal plate made of a bonding material of a metal plate and a metal foil and provided with explosion-proof windows and reference holes regularly is fed into a progressive die one pitch at a time, and is sequentially press-formed. A method of manufacturing a sealed battery container lid by drawing, wherein a part of the connection portion around the explosion-proof window is partially removed from the metal plate with reference to the reference hole. The punching process for separating is performed at least once, and then the first drawing process of the drawing process is performed with reference to the reference holes on both sides around the explosion-proof window. A method for producing a sealed battery container lid, wherein the method is performed with reference to a concave portion formed by the first drawing. 5. A long metal plate made of a bonding material of a metal plate and a metal foil and provided with an explosion-proof window and a reference hole regularly is fed into a progressive die one pitch at a time, and is sequentially press-formed. A method for manufacturing a sealed battery container lid by applying a forming process, wherein a slit is formed around the reference hole and the explosion-proof window with respect to the reference hole, thereby forming the reference hole and the molding. The processing portion is held by a narrow connection portion, and the respective processes of sequentially performing the press forming are positioned by inserting a positioning pin into the reference hole near the forming portion where the processing is performed and deforming the narrow connection portion. A process for producing a sealed battery container lid. 6. The manufacturing method according to claim 5, wherein, during the slitting step, a rounded portion is formed in a part of the outer surface of the rear surface of the metal plate by pressing a surface within a part of the outer shape of the final product. 7. A progressive die having, at a constant interval, a punching section for cutting a processing section of a plate material while leaving a part of a connection section, and a plurality of forming sections for sequentially performing press forming. A first positioning pin, which can be fitted into a reference hole of the plate material, is provided in at least a part of the processing portion in a cavity mold or a core mold, and a reference hole of the plate material is provided in a processing portion in an initial stage of the molding processing portion. A second positioning pin that can be fitted in the cavity mold or the core mold;
And a press-molding die having at least a part of a joint surface between the cavity die and the core die between the second positioning pins and a relief portion for bending the plate material.