JP2022021840A - Stacking method of workpieces for press molding - Google Patents

Abstract

To stack each workpiece having a step surface in a manner that inclination is prevented without incurring costs to form a stacked body which makes collapse of the stacked body and failure caused when the stacked body is taken out less likely to occur.SOLUTION: A plurality of overhanging protrusions 13, each having a circular cross section and a protruding height set to the same as a plate thickness of a patchwork 12, are molded at positions at predetermined intervals along an outer peripheral edge part on one surface of a blank 11 of a patchwork blank 10 and then the patchwork blank 10 is placed. The same number of overhanging protrusions 13 are molded along an outer peripheral edge part on one surface of the patchwork 12 of the patchwork blank 10 to be stacked next so as to be located at positions different from the positions of the overhang protrusions 13 of the patchwork blank 10 placed previously and then the patchwork blank 10 is placed on the patchwork blank 10 placed previously in an attitude at which the protruding side of each molded overhanging protrusion 13 is directed to the same side as the protruding side of each overhanging protrusion 13 of the patchwork blank 10 placed previously.SELECTED DRAWING: Figure 8

Description

The present invention relates to a method for stacking press forming workpieces having a stepped surface by stacking a large number of press forming workpieces in a stack.

Conventionally, for example, in a production line where hot press molding is performed, a large number of press forming workpieces are stacked on a pallet and carried in as a stack, and the loaded workpieces are taken out in order from the top and pressed. Press molding is performed with a molding machine.

By the way, in the case of a press forming work in which a stepped surface is partially formed on one surface by a region having a plate thickness difference such as a tailored blank, if the work is stacked in order as it is, the stage of the region with a thin plate thickness is formed. There is a large difference in the stacking height between the stacking location and the stacking location in the thick region, and as each work of the stack goes up, the posture is tilted toward the region where the plate thickness is thin. turn into. Then, the stack may collapse, or the work may fail to be taken out from the stack to the press forming machine by using the take-out device.

In order to avoid this, for example, in Patent Document 1, a plurality of overhanging convex portions are formed in a region having a thin plate thickness on one surface of a tailored blank. The overhanging protrusions are provided at equal intervals around the first overhanging portion and the first overhanging portion whose overhang height is set to be equal to or larger than the thick region on one surface of the tailored blank. , With four second overhangs forming a cross in plan view, the overhang height of each second overhang is set to be the same as the thick region on one side of the tailored blank. There is. Then, the tailored blank placed first is placed on one surface of the tailored blank to be stacked next so as to be at the same position as each overhanging convex portion of the tailored blank placed first. After molding the same number of each overhanging convex part so that each overhanging convex part of the tailored blank is rotated by 45 degrees around the center line of the first overhanging part in a plan view, each overhanging convex part is molded. The overhanging side of the part is placed on the tailored blank in the same posture as the previously placed tailored blank, and the upper tailored part is placed on each second overhanging part of the overhanging convex part in the lower tailored blank. By placing each second overhanging portion of the overhanging convex portion on the blank, each tailored blank in a stacked state is prevented from tilting.

Patent No. 35649939

However, in Patent Document 1, each overhanging convex portion to be molded into a tailored blank has a complicated shape, and a mold for forming the overhanging convex portion is formed every time the overhanging convex portion is formed in the tailored blank. A mechanism for rotating the mold is required, which may increase the cost of the mold and the molding apparatus and the maintenance cost. This can be said for the case of stacking other works having a stepped surface such as a patchwork blank in which a patchwork is attached to a predetermined position of the blank material.

The present invention has been made in view of these points, and an object of the present invention is to stack each work having a stepped surface so as not to incline without incurring a cost, and it is difficult for a load to collapse or a defective removal to occur. It is an object of the present invention to provide a stacking method of a press forming work which can be made into a stack.

In order to achieve the above object, the present invention makes the overhanging convex portion into a simple shape, and makes each work into a stable stacking posture without rotating the mold for forming the overhanging convex portion. It is characterized by elaborate ingenuity.

Specifically, a large number of sheet-shaped press-forming workpieces having a second region that is thinner than the first region and has a stepped surface with the first region on one surface are stacked for stacking. In the method of stacking press forming workpieces, the following solutions were taken.

That is, in the first invention, the overhanging height is set to be the same as the plate thickness difference between the first region and the second region, or the overhanging convex portion having an oval cross-section. After forming a plurality of the workpieces at positions at predetermined intervals along the outer peripheral edge portion of one surface of the second region of the workpiece, the workpiece is in a posture in which the overhanging side of each overhanging convex portion faces upward. Alternatively, the work is placed on the work placed in a predetermined position or in a downward position, and then stacked along the outer peripheral edge portion of the second region of the work to be stacked. After molding the same number of overhanging protrusions so that they are at different positions from the overhanging protrusions of the work on which the overhanging protrusions are placed first, the overhanging side of each of the molded overhanging protrusions is already placed on the work. It is characterized in that it is placed on the work previously placed in a posture facing the same side as the overhanging side of each overhanging convex portion.

In the second invention, in the first invention, the work is a patchwork blank in which a metal patchwork is attached to a metal blank material, and the overhanging convex portion is centered on the center of gravity of the blank material. The center of gravity of the blank material is provided in at least three places, two on one side and one on the other side of the patchwork blank, and the center of gravity of the blank material is placed inside a triangle formed by the three overhanging protrusions. It is characterized by being located so as to include.

In the third invention, in the second invention, the overhanging convex portions are provided at two locations on one side and one location on the other side of the patchwork blank centering on the center of gravity of the patchwork, for a total of three locations. It is characterized in that it is provided at least and is located so as to include the center of gravity of the patchwork inward of the triangle formed by the three overhanging protrusions.

In the first invention, the apex of each overhanging convex portion having the same overhang height when the respective works are stacked is a place where each overhanging convex portion of the adjacent work is not formed on the outer peripheral edge of the work. Come into contact with. Further, in the other regions of the work in which each overhanging convex portion is not formed, one surface of the first region located at the same height as the apex of each overhanging convex portion comes into contact with the adjacent work. .. Therefore, since the distance between the adjacent works is kept constant between each overhanging convex portion and the first region, each work can be in a stable stacking state. In addition, the shape of the overhanging convex portion is changed to a circular cross-section or an oval cross-section with a simple mold structure, and the molding positions of the overhanging convex portions of adjacent workpieces in a stacked state are different. By doing so, each patchwork blank in the stacked state is prevented from tilting, so that it is not necessary to form an overhanging convex portion having a complicated shape as in Patent Document 1, and further, gold for forming the overhanging convex portion. Since there is no need for a mechanism for rotating the mold, it is possible to avoid increasing the cost and maintenance cost of the mold and the molding apparatus, and to perform the stepped work of each work having a stepped surface at no cost.

In the second invention, the three overhanging protrusions provided at distant positions in the blank material come into contact with the blank materials of the adjacent patchwork blanks, so that each patchwork blank is in a stable stacking state. Therefore, it is possible to reliably prevent the load collapse of the stack and the defective removal of the patchwork blank due to the tilting of each patchwork blank.

In the third invention, the three overhanging protrusions provided so as to surround the patchwork come into contact with the area of the blank material corresponding to the patchwork of the adjacent patchwork blanks, so that each of them is in a stacked state. The area side of the patchwork blank to which the heavy patchwork is attached can be reliably prevented from sinking and tilting, and each patchwork blank can be put into a stable stacking state.

It is a block diagram of the production line to which the stacking method of the work which concerns on embodiment of this invention is applied. It is a schematic perspective view which shows the state in which each patchwork blank is stacked after the patchwork is attached to the blank material to form a patchwork blank in the patchwork attachment process. It is a top view of one of two kinds of patchwork blanks. It is an IV arrow view of FIG. FIG. 3 is a plan view of the other of the two types of patchwork blanks. It is a VI arrow view of FIG. It is an arrow view of XII of FIG. It is sectional drawing in the XIII-XIII line of FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the following description of the preferred embodiment is essentially merely an example.

FIG. 1 shows a production line 1 according to an embodiment of the present invention. The production line 1 is capable of forming a patchwork blank 10 (workpiece, see FIGS. 3 to 6) and then press-molding the patchwork blank 10 to obtain pressed parts. A blanking step S1 for obtaining a sheet-shaped metal blank material 11 and a patchwork 12 in order from the upstream side of 1 and a patchwork 12 attached to the blank material 11 to obtain a plurality of patchwork blanks 10. The patchwork mounting step S2 for stacking the patchwork blanks 10 and the press forming step S3 for press-molding the patchwork blanks 10 are arranged in order.

The blanking step S1 includes a press forming apparatus (not shown) equipped with a blank mold, and as shown in FIGS. 3 to 6, the press forming apparatus is used to gently bend the coil material in a plan view. A blank material 11 having a bow shape is obtained.

On both sides of one end of the blank material 11 in the longitudinal direction, a first bulging edge portion 11a and a second bulging edge portion 11b that bulge outward and form a wide shape in the longitudinal direction of the blank material 11 are provided. On the other hand, on one side of the other end in the longitudinal direction, a third bulging edge portion 11c that bulges outward and has a wide shape in the longitudinal direction of the blank material 11 is provided.

Further, a fourth bulging edge portion 11d that bulges outward and has a wide shape in the longitudinal direction of the blank material 11 in a plan view is provided on one side of the middle portion of the blank material 11 in the longitudinal direction. On the other side near the other end, a fifth bulging edge portion 11e that bulges outward and has a wide shape in the longitudinal direction of the blank material 11 in a plan view is provided.

Then, four first to fourth holes H1 to H4 forming a circular shape are formed in the middle portion of the blank material 11 in the width direction at predetermined intervals in the longitudinal direction.

Further, on one surface of the blank material 11, an overhanging convex portion 13 having the same shape having a substantially circular cross section in the horizontal direction projecting to one surface side of the blank material 11 is predetermined along the outer peripheral edge portion. Five are formed with an interval of.

In the blanking step S1, there are two types of blank dies for forming the blank material 11, and by switching the blank dies for each production lot, the two types of blank materials 11 having different forming positions of the overhanging convex portions 13 are present. Are formed and each is stacked. In the following, one will be referred to as a blank material 11A (see FIGS. 3 and 4), and the other will be referred to as a blank material 11B (see FIGS. 5 and 6).

The five overhanging convex portions 13 of the blank material 11A are formed near one end in the longitudinal direction in the first to fifth bulging edge portions 11a to 11e, respectively.

On the other hand, the five overhanging convex portions 13 of the blank material 11B are formed near the other end in the longitudinal direction in the first to fifth bulging edge portions 11a to 11e, respectively.

That is, the overhanging convex portions 13 are provided at least at three locations, two locations on one side and one location on the other side, centered on the center of gravity portions X1 of the blank materials 11A and 11B, and the overhanging convex portions 13 are provided at least at three locations. The center of gravity X1 of the blank materials 11A and 11B is included in the inside of the triangle formed by 13.

As a specific example, the overhanging convex portions 13 formed on the first to fifth bulging edge portions 11a to 11e of the blank material 11A are referred to as overhanging convex portions 13A to 13E, and the first to the blank material 11B. When the overhanging convex portions 13 formed on the 1st to 5th bulging edge portions 11a to 11e are called the overhanging convex portions 13A'to 13E', the overhanging convex portions 13A, the overhanging convex portions 13B and the overhanging convex portions are called. The center of gravity X1 of the blank material 11A is included in the inside of the triangle formed by the portion 13C, while the inside of the triangle formed by the overhanging convex portion 13A', the overhanging convex portion 13B'and the overhanging convex portion 13C'. The center of gravity portion X1 of the blank material 11B is included on the side.

Further, to give a different specific example, the center of gravity portion X1 of the blank material 11A is included in the inside of the triangle formed by the overhanging convex portion 13A, the overhanging convex portion 13C, and the overhanging convex portion 13E, while the overhanging convex portion is included. The center of gravity X1 of the blank material 11B is included in the inside of the triangle formed by the portion 13A', the overhanging convex portion 13C', and the overhanging convex portion 13E'.

Further, in the blanking step S1, a patchwork 12 having a bow shape that is gently curved in a plan view is obtained from the coil material by using a press forming apparatus.

The patchwork 12 has an outer shape smaller than the outer shape of the blank materials 11A and 11B. A circular first hole h1 is formed on one end side in the longitudinal direction of the patchwork 12, while a long hole-shaped second hole h2 is formed at a position closer to the other end in the longitudinal direction, and the first hole h1 is formed. The second hole h2 is at a position corresponding to the third hole H3 and the fourth hole H4 of the blank materials 11A and 11B when the patchwork 12 is superposed on the blank materials 11A and 11B, respectively.

In the patchwork attachment step S2, as shown in FIG. 2, the patchwork 12 is attached to the first work area W1 from which the blank material 11A or the blank material 11B is taken out, and the blank material 11A or the blank material 11B to form the patchwork blank 10. A second work area W2 and a third work area W3 for stacking a plurality of patchwork blanks 10 are provided in a straight line.

In the first work area W1, a first pallet 2a on which the stack 14 of the blank material 11A is placed and a second pallet 2b on which the stack 15 of the blank material 11B is placed are arranged side by side.

A first transfer robot 3 having a first material handling 3a attached to the tip of the arm is arranged between the first work area W1 and the second work area W2, and the first transfer robot 3 is a blank material 11A. The blank material 11B is taken out in order from the first pallet 2a and the second pallet 2b and transported to the second work area W2.

In the second work area W2, a welding jig 4 for positioning the blank material 11A or the blank material 11B and the patchwork 12 in a stacked state, and a welding jig 4 located on one side of the welding jig 4, are located at the tip of the arm. 2 The second transfer robot 5 to which the material handling 5a is attached, the welding robot 6 located on the other side of the welding jig 4 and the spot welding gun 6a attached to the tip of the arm, and the second transfer robot 5. A third pallet 7 is arranged on the side and on which the stack 16 of the patchwork 12 is placed.

The second transfer robot 5 takes out the patchwork 12 from the third pallet 7 and places it on the welding jig 4.

The welding robot 6 is adapted to obtain a patchwork blank 10 by connecting the blank material 11A or the blank material 11B positioned on the welding jig 4 and the patchwork 12 by spot welding with a spot welding gun 6a.

When the patchwork 12 is attached to the other end side of the blank material 11A or the blank material 11B in the longitudinal direction and to the overhang side of each overhanging convex portion 13, and the patchwork 12 is attached to the blank material 11A or the blank material 11B. The overhang height of each overhanging convex portion 13 is set to the same position as one surface of the patchwork 12.

That is, the region of the patchwork 12 (first region) in the patchwork blank 10 is thicker than the region (second region) of the patchwork blank 10 excluding the patchwork 12, and a stepped surface is formed on one surface. The overhang height of each overhanging convex portion 13 is set so as to be the same as the plate thickness difference.

In the following, for convenience, the patchwork blank 10 obtained from the blank material 11A will be referred to as a patchwork blank 10A, and the patchwork blank 10 obtained from the blank material 11B will be referred to as a patchwork blank 10B. That is, two types of patchwork blanks 10 having different molding positions of the overhanging convex portion 13 are formed.

The overhanging convex portions 13 in the patchwork blanks 10A and 10B are provided at least at three locations, two locations on one side and one location on the other side, centered on the center of gravity portion X2 of the patchwork 12, and the three locations are stretched. The center of gravity X2 of the patchwork 12 is included in the inside of the triangle formed by the protrusion 13.

As a specific example, the center of gravity X2 of the patchwork 12 is included in the inside of the triangle formed by the overhanging convex portion 13C, the overhanging convex portion 13D, and the overhanging convex portion 13E, while the overhanging convex portion is included. The center of gravity X2 of the patchwork 12 is included in the inside of the triangle formed by the 13C', the overhanging convex portion 13D', and the overhanging convex portion 13E'.

Further, to give a different specific example, the center of gravity portion X2 of the patchwork 12 is included in the inside of the triangle formed by the overhanging convex portion 13A, the overhanging convex portion 13C, and the overhanging convex portion 13E, while the overhanging convex portion is included. The center of gravity X2 of the patchwork 12 is included in the inside of the triangle formed by the portion 13A', the overhanging convex portion 13C', and the overhanging convex portion 13E'.

A third transfer robot 8 having a third material handling 8a attached to the tip of the arm is arranged between the second work area W2 and the third work area W3, and the third transfer robot 8 is a welding jig 4. The patchwork blanks 10A and the patchwork blanks 10B, which are sequentially formed in the above, are taken out from the welding jig 4 and alternately transported to the third work area W3.

In the third work area W3, a fourth pallet 9 on which the stacking body 17 in which the patchwork blank 10A and the patchwork blank 10B are stacked in order is placed is arranged.

The press forming step S3 includes a heating furnace (not shown) for heating the patchwork blanks 10A and 10B and a hot press device (not shown) equipped with a press die, and uses the hot press device to heat the heating furnace. Press-molded products are obtained from the patchwork blanks 10A and 10B heated in.

Next, the production of the patchwork blank 10 according to the embodiment will be described in detail.

First, in the blanking step S1, the blank material 11 is formed from the coil material. At this time, five overhanging convex portions 13 are formed on the outer peripheral portion of the blank material 11.

There are two types of blank dies used in the blanking step S1 in which the forming positions of the overhanging convex portions 13 are different, and the dies are switched for each production lot to use the blank material 11A and the blank material 11B. Form each. Then, each blank material 11A is stacked on the first pallet 2a to form a stacking body 14, and each blank material 11B is stacked on the second pallet 2b to form a stacking body 15. The first pallet 2a on which the stack 14 is placed and the second pallet 2b on which the stack 15 is placed are each transported to the patchwork mounting step S2.

Next, in the patchwork attaching step S2, the second transfer robot 5 takes out the patchwork 12 from the stack 16 of the third pallet 7 and places it on the welding jig 4, and then the first transfer robot 3 first. The blank material 11A is taken out from the pallet 2a, placed on the welding jig 4, and positioned on the welding jig 4 with the blank material 11A and the patchwork 12 stacked. After that, the welding robot 6 integrates the blank material 11A and the patchwork 12 positioned on the welding jig 4 by spot welding to obtain a patchwork blank 10A.

After that, the third transfer robot 8 takes out the patchwork blank 10A of the welding jig 4 and places it on the fourth pallet 9. At this time, the vertices of the overhanging protrusions 13A to 13E having the same overhang height are in contact with the upper surface of the fourth pallet 9, and the patchwork 12 is in contact with the upper surface of the fourth pallet 9 to contact the patchwork blank 10A. Becomes a horizontally extending posture.

When the patchwork blank 10A is taken out from the welding jig 4, the second transfer robot 5 takes out the patchwork 12 from the stack 16 of the third pallet 7 and places it on the welding jig 4, and then the first transfer robot. 3 takes out the blank material 11B from the second pallet 2b, places it on the welding jig 4, and positions the blank material 11B and the patchwork 12 on the welding jig 4 in a state of being overlapped with each other. After that, the welding robot 6 integrates the blank material 11B and the patchwork 12 positioned on the welding jig 4 by spot welding to obtain the patchwork blank 10B.

After that, the third transfer robot 8 takes out the patchwork blank 10B of the welding jig 4 and superimposes it on the patchwork blank 10A placed on the fourth pallet 9. At this time, the vertices of the overhanging convex portions 13A'to 13E' having the same overhanging height are each overhanging convex portion in the blank material 11A of the patchwork blank 10A previously placed on the outer peripheral edge portion of the blank material 11B. It comes into contact with a place where 13A to 13E are not formed. Further, one surface of the patchwork 12 comes into contact with the blank material 11A of the patchwork blank 10A placed earlier. Therefore, it is difficult for the intervals between the adjacent patchwork blanks 10A and 10B to vary, and the patchwork blanks 10B are in a horizontally extending posture.

When the patchwork blank 10B is taken out from the welding jig 4, the second transfer robot 5 takes out the patchwork 12 from the stack 16 of the third pallet 7 and places it on the welding jig 4, and then the first transfer robot. 3 takes out the blank material 11A from the first pallet 2a, places it on the welding jig 4, and positions the blank material 11A and the patchwork 12 on the welding jig 4 in a state of being overlapped with each other. After that, the welding robot 6 integrates the blank material 11A and the patchwork 12 positioned on the welding jig 4 by spot welding to obtain a patchwork blank 10A.

After that, the third transfer robot 8 takes out the patchwork blank 10A of the welding jig 4 and puts it on the patchwork blank 10B placed on the fourth pallet 9. At this time, the vertices of the overhanging protrusions 13A to 13E having the same overhang height do not form the overhanging protrusions 13A'to 13E'of the blank materials 11B adjacent to each other at the outer peripheral edge of the blank material 11A. Come into contact with the place. Further, one surface of the patchwork 12 comes into contact with the blank material 11B of the adjacent patchwork blanks 10B. Therefore, it becomes difficult for the intervals between the adjacent patchwork blanks 10A and 10B to vary, and the patchwork blanks 10A extend horizontally.

In this way, the patchwork blanks 10A and 10B are alternately manufactured in the welding jig 4, and the patchwork blanks 10A and 10B are sequentially stacked on the fourth pallet 9, so that the patchwork blanks 10A and 10B are sequentially stacked on the fourth pallet 9, as shown in FIGS. 7 and 8. A stacking body 17 in which patchwork blanks 10A and 10B are alternately stacked is obtained.

In this stacked body 17, the vertices of the overhanging protrusions 13 having the same overhang height are formed on the outer peripheral edges of the blank materials 11A and 11B so that the overhanging protrusions 13 of the blank materials 11A and 11B are adjacent to each other. You will come into contact with places that are not. Further, in the other regions of the patchwork blank 10 where the overhanging convex portions 13 are not formed, one surface of the patchwork 12 located at the same height as the apex of each overhanging convex portion 13 is adjacent to the patch. It comes into contact with the work blank 10. Therefore, the distance between the adjacent patchwork blanks 10A and 10B is kept constant between the overhanging protrusions 13 and the patchwork 12, so that the patchwork blanks 10A and 10B are in a stable stacking state. can do.

After that, the fourth pallet 9 on which the stacked body 17 is placed is transported to the press forming step S3.

Then, in the press molding step S3, the stacked patchwork blanks 10A and 10B are sequentially taken out, and press-molded products are sequentially molded using a press molding machine (not shown).

From the above, according to the embodiment of the present invention, when a large number of patchwork blanks 10A and 10B having stepped surfaces are stacked, a stable stacking state can be obtained.

Further, the shape of the overhanging convex portion 13 is changed to a circular cross-sectional shape having a simple mold structure, and the molding positions of the overhanging convex portions 13 of the adjacent patchwork blanks 10A and 10B in the stacked state are different. By doing so, the patchwork blanks 10A and 10B in the stacked state are prevented from tilting, so that it is not necessary to make the overhanging convex portion having a complicated shape as in Patent Document 1, and further, the overhanging convex portion. Since there is no need for a mechanism to rotate the mold for molding, the patchwork blanks 10A and 10B having a stepped surface can be used without increasing the cost and maintenance cost of the mold and the molding device. You can perform stepped work.

Further, since the three overhanging protrusions 13 provided at distant positions in the blank material 11 come into contact with the blank material 11 of the adjacent patchwork blanks 10, each patchwork blank 10 is in a stable stacking state. Therefore, it is possible to reliably prevent the load collapse of the stack 17 and the defective removal of the patchwork blank 10 due to the tilting of each patchwork blank 10.

Further, since the three overhanging protrusions 13 provided so as to surround the patchwork 12 come into contact with the region of the blank material 11 corresponding to the patchwork 12 of the adjacent patchwork blanks 10, in the stacked state. It is possible to surely prevent the area side of each patchwork blank 10 to which the heavy patchwork 12 is attached from sinking and tilting, and to put each patchwork blank 10 in a stable stacking state.

In the embodiment of the present invention, the stacking method for stacking the patchwork blanks 10 has been described, but the present invention can also be applied to stacking other workpieces having a stepped surface. For example, the method of the present invention can be applied when stacking tailored blanks.

Further, in the embodiment of the present invention, each overhanging convex portion 13 is simultaneously molded when the blank material 11 is formed in the blanking step S1, but the present invention is not limited to this, and for example, in the patchwork mounting step S2. After the blank material 11 and the patchwork 12 are integrally welded to obtain the patchwork blank 10, the overhanging convex portion 13 is formed at a predetermined position of the patchwork blank 10 using a predetermined molding device. May be good.

Further, in the embodiment of the present invention, each of the patchwork blanks 10A and 10B is provided with five overhanging protrusions 13, but when the patchwork blanks 10A and 10B are stacked, each of them has a horizontal posture. If this is the case, the number of the overhanging convex portions 13 may be three to four, or six or more may be provided.

Further, in the embodiment of the present invention, the overhanging convex portions 13 provided on the patchwork blanks 10A and 10B have a circular cross section in the horizontal direction, but the horizontal cross section is not limited to the circular shape. It may be shaped.

The present invention is suitable for a stacking method of a press forming work in which a large number of press forming workpieces having a stepped surface are stacked and stacked.

10 Patchwork blank (work)
11 Blank material 12 Patchwork 13 Overhanging convex part 17 Stacked body X1 Center of gravity of blank material X2 Center of gravity of patchwork

Claims (3)

A press-forming work in which a large number of sheet-shaped press-forming works having a second region having a stepped surface with the first region on one surface, which is thinner than the first region, are stacked and stacked. It is a stacking method of
The overhanging protrusion having a circular cross-section or an oval cross-section whose overhang height is set to be the same as the plate thickness difference between the first region and the second region is formed on the second portion of the work. After forming a plurality of workpieces at predetermined intervals along the outer peripheral edge portion of one surface of the region, the work is predetermined in a posture in which the overhanging side of each of the overhanging protrusions faces upward or downward. Place it on the above-mentioned work placed at the position of
Next, the overhanging protrusions are placed at different positions from the overhanging protrusions of the work on which the overhanging protrusions are previously placed along the outer peripheral edge portion of one surface of the second region of the work to be stacked. After molding the same number, the overhanging side of each of the molded overhanging protrusions is placed on the work previously placed in a posture facing the same side as the overhanging side of each of the overhanging protrusions of the above-mentioned work. A method of stacking press forming workpieces, which is characterized by placing. In the stacking method of the press forming workpiece according to claim 1,
The above work is a patchwork blank in which a metal patchwork is attached to a metal blank material.
The overhanging protrusions are provided at least three places in the patchwork blank, two places on one side and one place on the other side, centering on the center of gravity of the blank material, and the three overhanging protrusions are provided. A method for stacking press forming workpieces, which is located inside the triangle formed by the above blank material so as to include the center of gravity of the blank material. In the stacking method of the press forming workpiece according to claim 2.
The overhanging protrusions are provided at least three places in the patchwork blank, two places on one side and one place on the other side, centering on the center of gravity of the patchwork, and the three overhanging protrusions are provided. A method for stacking press-formed workpieces, which is located inside the triangle formed by the above patchwork so as to include the center of gravity of the patchwork.

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