KR20210080195A - Telesopic type drawing device and method thereof - Google Patents

Abstract

In accordance with the present invention, disclosed are a telescopic drawing formation apparatus and a method thereof. The formation apparatus of the present invention includes: an upper die having a first formation hole having a curved upper edge part; a lower die having a second formation hole smaller than the first formation hole, having a curved upper edge part, and having the first and second formation holes fixed concentrically in a lower part of the upper die; an iron block installed on a lower side of the lower die, and having an inner surface minutely projected further than the inner surface of the second formation hole to flatten wrinkles of a metal container having passed through the lower die; and a telescopic punch including a sleeve punch corresponding to the first formation hole, and a plunger punch combined to be movable in the sleeve punch while corresponding to the second formation hole, to drop the punches at the same time with respect to the first formation hole, and then, drop only the plunger punch with respect to the second formation hole and the iron block by projecting the plunger punch to the bottom of the sleeve punch. The telescopic drawing formation apparatus can simply form the metal container through one single operation of a punch by sequentially processing a material in a vertical direction as well as form a corner of the formed metal container into a right-angled or circular shape.

Description

Multi-stage drawing forming apparatus and method {Telesopic type drawing device and method thereof}

The present invention relates to a drawing forming apparatus and method for manufacturing a seamless metal container, and more particularly, to a metal container by processing a material sequentially in a vertical direction in a single operation with a single punch. Of course, by forming the corners of the molded metal container at right angles, for example, it is possible to ensure stability of storage through tight storage of electric and electronic parts, and to contribute to miniaturization of electric and electronic devices. It relates to an apparatus and method.

As is well known, drawing processing is a kind of plastic processing in which a plate-shaped metal material is stretched using a mold to form a desired shape such as a cylinder, a square cylinder, or a hemispherical shape. It is mainly used for

For such a drawing process, die drawing using a die and a punch press is common, and when forming a container with a deep head, a deep drawing technique is used.

Due to the nature of deep drawing processing, the contact time between the material and the mold is long, and accordingly, the degree of side effects due to friction is large. Therefore, for easy processing, friction between the punch and the die should be low, and the deep drawing processing is performed by forcibly injecting lubricating oil into the surface of the die and the surface of the punch. For this reason, deep drawing processing has a disadvantage in that the consumption cost of lubricating oil is high.

On the other hand, metal containers molded by drawing processing are widely used in various forms in various industrial fields such as various kitchen appliances, beverage cans, and small electric and electronic parts cases due to their seamless advantages. Containers are mainly used.

In the case of general household goods such as kitchenware or beverage cans, the shape precision of the container produced by drawing processing is not significantly affected. For example, in the case of small electric and electronic parts, the shape of the container molded by drawing processing Precision is very important.

In other words, it is important that electric and electronic component cases exactly match the shape and size of the components to be accommodated for stable storage, so that the components are stored without gaps, and furthermore, it affects the stability and compactness of products employing the components. Therefore, it is inevitably sensitive to the shape precision of drawing processing.

A conventional drawing molding method is a molding method in which several molds having different molding depths are sequentially arranged, and the metal material is transferred from a low-depth mold to a gradually deep mold in succession while gradually increasing the depth. is taking

This is a technology that uses a slip friction action to force a metal material into the forming hole of the die with a punch and stretch it. Since the metal material is damaged when a metal container is formed with one operation of the punch, the depth of the forming hole The desired metal container is completed by sequentially performing several molding processes through several different molds.

However, in this conventional drawing forming method, because forcible sliding friction occurs between the metal material and the forming hole by the punch, for example, when forming a rectangular container such as a square, even if it is formed through several processes, cracks or tears occur at the corners. Serious damage, such as bursting, occurs.

For this reason, the prismatic container manufactured by the conventional drawing molding apparatus takes an arc shape without forming a right angle. For this reason, when electric and electronic parts are stored, a gap occurs between the metal container and the parts, making it difficult to store them stably. However, since the volume of the rectangular metal container is formed as large as the gap, it inevitably affects the size of the product employing it.

Patent Document 1 is a pre-registered patent of the present applicant, and discloses a drawing forming apparatus capable of forming the corner of a rectangular metal container at a right angle.

In this technology, partially open pinholes are formed on the four sides of the upper part of the rectangular forming hole formed in the die, and pin rollers are rotatably installed in each pinhole so that a part of the pin roller is exposed through the forming hole, so that each pin roller is also It consists of a rectangular molding hole.

Accordingly, the unfinished square metal container, which has been gradually formed several times by a general molding device, is gently press-molded by rolling friction through rotational contact with the pin roller to form a right angle without damage to the corner.

However, in Patent Document 1, the corner can be formed at a right angle while shortening the forming process of the square metal container, but in order to complete the square metal container, a preforming process of gradually increasing the depth several times in advance as in the prior art is performed. Therefore, in order to form a square metal container, a plurality of drawing molding machines must be provided for each process.

For this reason, there is a problem in that the drawing and forming operation of the metal container is still complicated, it takes a lot of money and time, and also a wide working space must be secured.

1. Korean Patent Registration 10-1301154

The present invention was devised to solve the above-mentioned conventional problems, and by sequentially processing the metal material in the vertical direction, it is possible to simply complete the molding of the metal container with one operation of the punch, and thus An object of the present invention is to provide a multi-stage drawing forming apparatus capable of greatly reducing equipment, cost, and time.

Another object of the present invention is to minimize the frictional resistance due to molding by smoothly forming the edge of the metal material by rolling friction, so that the edge of the metal container can be reliably formed at a right angle without cracks or damage. to provide the device.

Another object of the present invention is to provide a multi-stage drawing forming apparatus capable of providing a high-quality product by finally ironing the surface of a metal container to be formed to flatten the wrinkles or curves of the surface.

Another object of the present invention is a multi-stage drawing forming method that can form a metal material into a metal container with only one operation of a punch, as well as form the corner of the metal container at a right angle without forming defects such as cracks. is to provide

A multi-stage drawing forming apparatus according to the present invention for achieving the above objects includes: an upper die having a first forming hole in which the upper periphery is formed in a curved surface; a lower die having a curved upper periphery and a second forming hole having a size smaller than that of the first forming hole, the first forming hole and the second forming hole being concentrically fixed in the lower part of the upper die; an iron block installed on the lower side of the lower die, the inner surface of which protrudes finely than the inner surface of the second forming hole, and straightens the wrinkles of the metal container passing through the lower die; and a sleeve punch corresponding to the first forming hole, and a plunger punch corresponding to the second forming hole while being movably coupled within the sleeve punch, After simultaneously descending for the second forming hole and for the iron block, only the plunger punch protrudes below the sleeve punch and descends, a telescopic punch is characterized in including.

The upper and lower ends of the inner surface of the iron block are configured as inclined surfaces or curved surfaces so that the movement of the metal container to be formed is performed smoothly.

It is preferable that an inclined portion having a curved or facing shape gradually narrowing downward is formed on the inner surface of the second forming hole.

An exhaust hole is formed through the inside of the plunger punch.

Another feature of the present invention is that the first forming hole and the second forming hole are formed in a square shape, and the corner portion of the first forming hole or the second forming hole has a corner roller formed with a concave curved surface having a predetermined curvature. more will be installed.

At this time, a corner roller support may be provided on the outside of the corner roller to stably support the corner roller.

Another feature of the present invention is that one or two or more additional forming dies are provided below the lower die, and the size of the forming hole of each forming die is gradually reduced as it goes downward, and the plunger punch corresponding to each forming die is provided. is built in multiple levels.

The present invention provides a multi-stage drawing forming method, comprising: a first forming step of first forming a metal disc into a container shape by simultaneously lowering a sleeve punch and an inner plunger punch into a forming hole; a second forming step in which a multi-step telescopic plunger punch is continuously descended through a multi-step forming hole that is continuously formed directly below the first forming step and gradually narrows in a multi-step drawing forming step; The ioning step of ironing while passing through the iron block protruding inwardly more finely than the final forming hole below the final forming hole of the second forming step; multi-step forming and ironing with one operation of the punch including; There is a characteristic that the metal container is formed as it progresses.

In the present invention, the forming holes are formed in a prismatic shape, and the corners of the metal disc are engaged with a corner roller formed with a concave curved surface at the corners of the selected forming holes among the forming holes so that the corners of the metal discs are engaged and descend. Another feature of the multi-stage drawing molding method is to reduce the frictional force applied so that the molding can be performed stably.

According to the multi-stage drawing forming apparatus and method according to the present invention, the forming hole of the die is formed stepwise so that the size becomes smaller as it goes downward, and the punch is continuously formed in a plate-shaped metal material while being extended in a telescopic form when the punch is lowered. It provides the effect of simply forming a metal container with only one operation of the

As a result, the molding process is minimized, which greatly reduces the waste of equipment, cost, and materials required for drawing processing, as well as significantly reduces the molding time for forming a metal container, thereby improving productivity.

In the present invention, when a rectangular metal container is molded, when the corner part of the metal material pressed into the forming hole by a punch is passed through the corner roller, bending is induced while rolling in contact with the corner roller, and frictional resistance during drawing is minimized. As a result, molding problems such as cracks or breakage in the bent part are effectively prevented, and the quality of the molded product can be improved by forming a rather dense structure through soft elongation by rolling friction.

The present invention provides the effect of producing a high-quality product by forming a smooth surface by finally ironing the wrinkles or curves that may be formed on the surface of the metal container according to the molding by an iron block.

1 is a front view schematically showing a multi-stage drawing forming apparatus according to the present invention.
Figure 2 is a cross-sectional view showing an embodiment of the molding apparatus die according to the present invention.
Figure 3 is a partially cut side view showing the punch of the present invention molding apparatus as an example.
Figure 4 is a cross-sectional view taken along line AA of Figure 3;
5a to 5d are cross-sectional views showing the operating state of the present invention for each process.
6 is a combined cross-sectional view of a molding apparatus die showing another embodiment of the present invention.
7A to 7F are cross-sectional views illustrating an operating state of the device shown in FIG. 6 ;
8 is a plan view showing an example of a molding apparatus die in a state in which a corner roller is installed.
9 (a), (b) is a plan view and a side cross-sectional view of the molding apparatus die of FIG.

Specific features and other advantages of the multi-stage drawing forming apparatus according to the present invention will become more apparent with the following description of preferred embodiments with reference to the accompanying drawings.

For reference, the terms used below are terms defined in consideration of functions in the present invention, which may vary according to the intention or custom of the user or operator. Therefore, definitions of these terms should be made based on the content throughout this specification.

In the present invention, both a circular metal container or a prismatic metal container can be molded, and in the examples, a rectangular metal container will be described as being molded, and the same reference numerals are applied to the same parts in each embodiment.

1 to 4 show a first embodiment of the present invention. Referring to this, in the multi-stage drawing forming apparatus according to the present invention, the first forming hole 111 and the second forming hole 121 of different sizes are formed in the center. Installed on the lower side of the drawing die 100 and the lower die 120 comprising the upper die 110 and the lower die 120 respectively provided in the forming holes 111 and 121 to be reduced toward the lower side. An iron block 133 for finishing the molded product (C) that has passed through the second molding hole 121 in a clean state, and a metal material ( B) is configured to include a telescopic punch 200 for pressing in multiple steps.

The first forming hole 111 of the upper die 110 has an upper outer periphery formed in a curved surface so that the plate-shaped metal material B can be easily bent, and each corner portion forming a square is also curved with an appropriate curvature. do.

That is, due to the nature of the drawing process, when the plate-shaped metal material (B) is formed at a right angle from the initial stage of forming, cracks are generated in the corner area where stress is concentrated and there is a high risk of damage. Of course, the corners are also treated as curved surfaces.

The second forming hole 121 of the lower die 120 is formed smaller than the first forming hole 111 in the vertical downward direction of the first forming hole 111, and similarly, the upper outer periphery is formed in a curved surface, and a square is formed. Each corner portion is configured to form a curved surface or a right angle, if necessary.

On the inner surface of the second forming hole 121, a curved or facing inclined portion 122 that gradually narrows downward is formed, and serves to induce the metal disc to be formed gradually narrower as it descends.

An iron die 130 is installed on the lower side of the lower die 120 . The iron die 130 has a through hole 131 having the same size as the second forming hole 121 of the second forming hole 121 . An iron block 133 is installed on the inner surface of the through hole 131 to finish processing the molded product C that has passed through the second forming hole 121 in a clean state.

That is, the molded product (C) molded into a container while passing through the second molding hole 121 may have fine wrinkles on the outer surface, and even if wrinkles do not occur, the surface may not be smooth, so the molded product (C) By passing the iron through the iron block 133 once more, it is finished in a neat state like ironing.

Therefore, the inner surface of the iron block 133 in sliding contact with the molded product (C) is finely protruded to the inside of the through hole (131), and the upper and lower corners of the inner surface of the iron block (133) also make it easier to use the molded product (C). An inclined surface 133b is provided for each entry and exit.

Here, the iron die 130 may be integrally configured with the lower die 120 , and the iron block 133 may be configured as a single body having a through hole in the center corresponding to the second forming hole 121 . , preferably having a configuration in which four unit blocks are combined on four sides.

To this end, the iron die 130 is also composed of four unit blocks, and on the inner surface of each unit block of the iron die 130, an iron mounting groove 132 for inserting the unit blocks of the iron block 133 is horizontally provided. is formed

The die 100 according to the present invention is fixed on the lower holder 1 by being integrally fastened with the upper die 110 , the lower die 120 , and the iron die 130 by bolts. In a state in which the die 100 is fixed to the lower holder 1, the inside of the forming holes 111 and 121 is elastically biased upward by the spring 301 to lower the molded product (C). An ejector (ejector: 300) that supports and ejects after molding is located.

The telescopic punch 200 is composed of a sleeve punch 210 having a rectangular cross section having a predetermined length, and a plunger punch 220 movably inserted into the sleeve punch 210 .

The sleeve punch 210 is mounted on the sleeve punch plate 4 through the fixing flange 211 provided at the top so that the lower end is movably coupled to the stripper (stripper: 3). The plunger punch 220 is longer than the sleeve punch 210 and is fixed to the plunger punch plate 5 located on the upper side of the sleeve punch plate 4 through a fixing flange 221 provided at the top.

The lower end of the sleeve punch 210 has an inclination angle α for smooth entry when in contact with the first forming hole 111 as shown in FIG. 3 .

The plunger punch 220 is coupled such that the lower end is positioned on the same plane as the lower end of the sleeve punch 210 , and the upper end protrudes upward of the sleeve punch 210 . An exhaust hole 222 is formed in the center of the plunger punch 220 to prevent problems due to compressed air during molding.

The sleeve punch 210 corresponds to the first forming hole 111 of the upper die 110 so that the outer corner is formed with a curved surface, and the inner surface of the sleeve punch 210 and the outer surface of the plunger punch 220 are formed by the second molding. It is formed in a shape corresponding to the hole 121 . That is, if the edge of the final metal container is a right angle, the inner surface of the sleeve punch 210 and the outer edge of the plunger punch 220 are also formed at a right angle.

In such a telescopic punch 200, the sleeve punch plate 4 is biased downward by an elastic means such as a gas spring, for example, while maintaining a predetermined interval with the stripper 3 by the first spacer (spacer: 7), and the plunger The punch plate 5 is fixed to the upper holder 2 and the second spacer 8 maintains a predetermined distance from the sleeve punch plate 4, so that the metal material B can be removed even in one operation of the punch 200. It can be molded in steps.

According to the description so far, although the configuration in which the upper die 110 and the lower die 120 are installed in two stages is exemplified in the apparatus according to the present invention, the lower die 120 is configured in a plurality of layers, and It is configured such that the size of the forming hole of each layer is gradually reduced, and the plunger punch corresponding to each layer is built in multiple stages, so that more stages of precise multi-stage drawing work can be performed.

Therefore, the second molding hole 121 according to the present invention may be interpreted as meaning including one or two or more molding holes.

In this way, when the second forming hole is formed of a plurality of forming holes, the iron block 133 is installed below the final forming hole.

Unexplained reference numeral 9 is a guide post for guiding the lifting action of the upper holder (2).

In the first embodiment of the present invention configured as described above, drawing forming is performed by the following process.

That is, the sleeve punch 210 and the plunger punch 220 on the inside of the first forming step of lowering to the forming hole at the same time to first mold the metal material (B) in the form of a container; a second forming step in which a multi-step telescopic plunger punch 220 is continuously descended through a multi-step forming hole that is continuously formed directly below the first forming step and gradually narrows in a multi-step drawing forming step; The ioning step of ironing while passing through the iron block 133 that protrudes finely inward than the final forming hole below the final forming hole of the second forming step; As the ironing proceeds sequentially, the molding of the molded product (C) is made.

The multi-stage drawing forming method of the present invention will be described in detail with reference to FIGS. 5A to 5D .

First, as shown in FIG. 2 , the metal material B to be formed is placed on the upper die 110 to cover the first forming hole 111 of the die 100 , and the punch 200 is operated.

Then, in the telescopic punch 200 of the present invention, as shown in FIG. 5a , the sleeve punch 210 and the plunger punch 220 descend at the same time to press the metal material B while pressing the first of the upper die 110 . It enters into the forming hole (111).

Accordingly, the metal material B is bent while being pushed into the first forming hole 111 along the punch 200 .

Next, after the punch 200 enters the lower end of the first forming hole 111, as shown in FIG. 5b, the sleeve punch 210 of the telescopic punch 200 of the present invention stops descending, and then the plunger punch As only 220 is extended downward of the sleeve punch 210 , the primary processed molded product C is pushed into the second molding hole 121 of the lower die 120 .

Then, the molded product (C) is re-molded while entering the small right-angled second molding hole 121 of the rectangle, at this time compressed along the inclined portion 122 of the second molding hole 121, the final size molded into a metal container of

Here, if more steps of the drawing process are required, the additional multi-step forming holes are gradually narrowed to the lower side of the second forming hole 121, so that more steps of the drawing process can be made. Each corner of the two forming holes is also made of a curved surface, and each corner is formed at a right angle in the forming hole of the final stage.

As shown in FIG. 5c , the molded product C secondarily processed while passing through the second forming guide roll 140 in this way further descends within the second forming hole 121 and passes through the iron block 133 . By doing this, even fine wrinkles that may occur are neatly straightened, and molding is performed in a good quality state.

In particular, since the outer surface of the molded product (C) passing through the iron block 133 is finely pressed as shown in FIG. 5D, there is a slight difference between the thickness d1 before passing through the iron block and the thickness d2 after the call. and the processing of the surface is made by the difference.

6 and 7 show a second embodiment of a multi-stage drawing forming apparatus according to the present invention. Referring to these drawings, a first forming hole 111 and a second forming hole 121 of different sizes are arranged in the center, respectively. A molding die 100 comprising an upper die 110 and a lower die 120 in which the forming holes 111 and 121 are arranged to be reduced toward the lower side, and the lower die 120 are installed on the lower side of the manufacturing 2 An iron block 133 for finishing the molded product (C) passing through the molding hole 121 in a clean state, and a metal material (B) corresponding to the molding holes 111 and 121 of the die 100 The configuration including the telescopic punch 200 for pressing in multiple steps is the same as the first embodiment, in addition to this, the reverse drawing die 400 installed inside the upper die, and the upper side of the upper die 110 A blanking die 500 installed as a blanking die 500 and a blanking punch 520 installed outside the telescopic punch 200 are further provided.

The reverse drawing die 400 is installed inside the upper die 110, and the inner surface forms the first forming hole 111 or has the same inner diameter as the first forming hole 111 of the upper die 110. Thus, it is possible to form a continuous first forming hole 111 .

The reverse drawing die 400 is formed in a tube shape in which the inner and outer periphery of the upper end are curved, and protrudes upwardly above the upper die 110 .

The blanking die 500 is installed on the upper side of the upper die 110, and its inner periphery is spaced apart from the outer periphery of the upwardly protruding portion of the reverse drawing die 400 to form a blanking groove 510, The blanking die 500 may be formed integrally with the upper die 110 in some cases.

The blanking punch 520 is located vertically above the blanking groove 510 and is installed to be spaced apart from the outer surface of the sleeve punch 210 by the thickness of the reverse drawing die 400, and by entering the blanking groove 510 by descending into the metal At the same time as cutting the outer edge of the material, the edge of the cut material, that is, the material positioned on the outer portion of the reverse drawing die 400 is bent downward.

Accordingly, the outer edge of the lower end of the blanking punch 520 is formed at a right angle for cutting, and the edge of the inner periphery is formed as a curved surface.

Since the configuration of the lower die 120, the iron block 133, and the telescopic punch 200 is applied the same as the configuration of the first embodiment described above, the same reference numbers are described and the overlapping configuration description is omitted.

In the second embodiment of the present invention configured as described above, drawing molding is performed by the following process.

A blanking step in which the metal material (B) is blanked by the blanking punch 520 and at the same time the edge of the metal material (B) is bent downward from the outside of the reverse drawing die 400; The sleeve punch 210 and the plunger punch 220 inside thereof simultaneously descend to the inside of the reverse drawing die 400, and the edge of the metal material B bent downward in the blanking step is spaced apart from the edge of the metal material. A first forming step in which the side portion of the metal container is stretched while the edge portion bent downward is stretched in reverse while being primarily formed into a container shape by bending the central portion downward; a second forming step in which the multi-step telescopic plunger punch 220 is continuously descended from the directly below the first forming step to the multi-step forming hole that is gradually narrowed in a multi-step drawing forming step; The ioning step of ironing through the iron block 133 that protrudes finely inward than the final forming hole below the final forming hole of the second forming step; by including; As the stretching by reverse drawing and multi-step molding and ironing proceed sequentially, the molding of the metal container is made.

The multi-stage drawing forming method of the present invention according to the second embodiment will be described in detail with reference to FIGS. 7A to 7F .

On the right side of the drawings is shown the forming state of the metal material (B) step by step.

First, as in FIG. 7a , the metal material B to be formed is placed on the blanking die 500 , and the punch 200 is operated.

Then, the blanking punch 520 and the telescopic punch 200 of the present invention descend at the same time, and as shown in FIG. 7b , the blanking punch 520 preferentially enters the blanking groove 510 and the bottom of the blanking punch 520 . The metal material (B) is cut by the outer part, and at the same time, the cut metal material (B) is pushed downward and the metal material (B) located outside from the upper support point of the reverse drawing die 400 is downward. will be bent

Then, as in FIGS. 7c and 7d, the blanking punch 520 stops, and the sleeve punch 210 and the plunger punch 220 descend while the central part of the metal material B, that is, the inner part of the reverse drawing die 400. It is bent while being pushed into the first forming hole 111 along the punch 200 .

As the central portion of the metal material B is pushed down by the telescopic punch 200, the outer edge portion of the metal material B that was bent downward is spread in the opposite direction while riding the upper end of the reverse drawing die 400. However, by stretching in the reverse direction, the structure of the metal material is relaxed and stabilized, thereby preventing cracks or damage that may occur during subsequent drawing molding.

Next, after the punch 200 enters to the lower end of the first forming hole 111, as shown in FIG. 7e, the sleeve punch 210 of the telescopic punch 200 of the present invention stops descending, and then the plunger punch As only 220 is extended downward of the sleeve punch 210 , the primary processed molded product C is pushed into the second molding hole 121 of the lower die 120 .

Then, the molded product (C) is molded into a metal container of the final size while being compressed again while entering into the second molding hole 121 of a small right-angled rectangle.

Here, if more steps of the drawing process are required, the additional multi-step forming holes are gradually narrowed to the lower side of the second forming hole 121, so that more steps of the drawing process can be made. Each corner of the two forming holes is also made of a curved surface, and each corner is formed at a right angle in the forming hole of the final stage.

As shown in FIG. 7f , the molded product C secondarily processed while passing through the second forming hole 121 as described above further descends within the second forming hole 121 and passes through the iron block 133 . Even the fine wrinkles that may occur are neatly straightened and the metal container is molded with good quality.

8 and 9 are views showing another embodiment of the present invention, and FIG. 8 is a plan view showing as an example a forming apparatus die in a state in which a corner roller is installed, and FIG. 9 is a plan view and a side cross-sectional view of the forming apparatus die of FIG. .

8 and 9 , a corner roller 600 having a concave curved surface with a predetermined curvature is installed at each corner of the first forming hole 111 formed in the upper die 110 .

To this end, at each corner of the first forming hole 111, a roller groove 112 having a shape corresponding to the corner roller 600 and opening toward the first forming hole 111 is formed, and each corner roller 600 ) is rotatably installed in a state supported by the roller shafts 601 on both sides.

The shape of both sides of the corner roller 600 may be selected in an arbitrary form as needed. For example, it may be formed as a protruding conical side without a roller shaft, and the upper die 110 has the corner A separate support for supporting the roller 600 may be further installed.

Since there is a high risk of breakage due to cracks occurring at the corners of the metal material where stress is concentrated during drawing forming, a curved surface is given to the corners of the forming holes so that they can be smoothly bent while preventing this, in addition to the corner roller (600) When the is installed, the corner portion of the metal material engages with the corner roller 600 and is formed while making rotational contact, so that the resistance due to friction is minimized and stable molding is made without cracks.

In the case where a multi-stage forming die forming the drawing die 100 is installed with more stages of forming dies under the second forming die, the corner roller 600 may be installed on the upper die or other intermediate dies. will be.

The present invention as described and illustrated above is not intended to be limited to the above-described embodiments, and may be embodied in various forms without departing from the gist of the present invention.

100 ; die 110 ; upper die
111; first forming hole 112; roller groove
120 ; lower die 121 ; 2nd forming hole
122; inclined portion 130 ; iron die
131; through hole 132 ; Iron mounting groove
133; iron block 200 ; telescopic punch
210; Sleeve Punch 220 ; plunger punch
300 ; ejector 301 ; spring
400 ; reverse drawing die 500 ; blanking die
510; blanking home 520 ; blanking punch
600 ; Corner roller 601 ; roller shaft
B; metal material C; molded product

Claims (3)

an upper die having a first forming hole formed with a curved upper periphery;
a lower die having a curved upper periphery and a second forming hole having a size smaller than that of the first forming hole, wherein the first forming hole and the second forming hole are concentrically fixed in the lower part of the upper die;
an iron block installed on the lower side of the lower die, the inner surface of which protrudes more finely than the inner surface of the second forming hole, and straightens the wrinkles of the metal container passing through the lower die; and
A sleeve punch corresponding to the first forming hole and a plunger punch corresponding to the second forming hole while being movably coupled within the sleeve punch are provided, and after simultaneously descending to the first forming hole, the second For the forming hole and the iron block, only the plunger punch protrudes below the sleeve punch and descends the telescopic punch; it is made including,
The lower die is provided with one or two or more, and the size of the forming hole of each forming die is gradually reduced as it goes downward, and the plunger punch corresponding to the lowermost forming die is lowered to the position of the iron block as it is, so that the metal container A multi-stage drawing forming apparatus, characterized in that it is adapted to iron the outer surface of the
The method of claim 1,
A multi-stage drawing forming apparatus, characterized in that an inclined portion of a curved surface or a facing shape gradually narrowing downward is formed on the inner surface of the second forming hole.
a first forming step of first forming a metal material into a container shape by simultaneously lowering the sleeve punch and the plunger punch inside the sleeve punch into the forming hole;
a second forming step in which a multi-step telescopic plunger punch is gradually extended and descended through a multi-step forming hole that is continuously formed directly below the first forming step and gradually narrows, and is drawn down in a multi-step drawing step;
An ioning step in which the plunger punch passing through the final forming hole proceeds downward as it is below the final forming hole of the second forming step and ironing the surface while passing through the iron block protruding inwardly more than the final forming hole; A multi-step drawing molding method, characterized in that the metal container is formed while multi-step molding and ironing are sequentially performed with one operation of the punch, including

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