JP2016198810A - Hemming method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hemming method with which working processes can be shortened and a cost of a die can be reduced.SOLUTION: In a hemming method, a tip bent part 5 and a tip inclined part 4 of an end part of a work-piece 1 are formed, and the tip inclined part 4 is bent upward at a prescribed angle in a first pressing process. While maintaining bending of the tip inclined part 4 by a lower die, the tip bent part 5 is bent downward in a direction substantially perpendicular to a plane of the work-piece 1 by an upper die. In a second pressing process, the bent parts of the tip inclined part 4 and the tip bent part 5 are pressed by the upper die while holding a body of the work-piece 1 by the lower die, the work-piece 1 is held between the upper die and the lower die, and bending work is performed so that the tip bent part 5 is made to tightly adhere to the tip inclined part 4 while turning the tip inclined part 4, and bending work is performed so that the tip inclined part 4 has a plane flush with that of the work-piece 1.SELECTED DRAWING: Figure 3

Description

The present invention relates to a method of hemming a metal plate workpiece end by press working using a lower die and an upper die.

Conventionally, hemming has been performed in three steps as shown in FIGS.
That is, as shown in FIG. 16, the tip portion 102 of the workpiece 101 is bent at a substantially right angle by a press in the first step. Thereafter, in order to facilitate hem crushing of the distal end portion 102, as shown in FIG. 17, the distal end portion 102 is further bent by a press in the second step and bent to about 45 degrees. In one step, it is difficult to bend the tip portion 102 as shown in FIG. 17 to approximately 45 degrees because the press mold moves up and down perpendicular to the workpiece.

Then, as shown in FIG. 18, in the third step, the workpiece 101 and the tip portion 102 are further sandwiched between the upper die and the lower die, folded and hem-crushed, and the tip portion 102 and the main body portion of the workpiece 101 are brought into close contact ( For example, see Patent Document 1.) Since the tip portion 102 is bent to approximately 45 degrees, the tip portion 102 can be easily brought into close contact with the main body portion of the work 101 by being sandwiched between the upper die and the lower die.

For this reason, there are three steps, and there are many machining steps, which may not fit within the workpiece transfer step.
Further, each of the molds corresponding to the three steps is required, which requires a large mold cost, increases the labor of processing, and increases the cost.

JP 2014-188563 A

  Therefore, it is an object of the present invention to provide a hemming method that can shorten the machining process and reduce the mold cost.

The present invention of claim 1 for solving the above-mentioned problem is a method of hemming a terminal of a workpiece of a metal plate by press working using a lower mold and an upper mold.
In the first press step, a tip bent portion that is bent by hemming of the workpiece end, and a tip inclined portion is provided on the main body side of the workpiece adjacent to the tip bent portion, and the tip inclined portion is directed upward by a predetermined angle. Bend with
Furthermore, while maintaining the bending of the tip inclined portion with the lower die, the upper die is bent downward in a direction substantially perpendicular to the plane of the workpiece with the upper die,
In the second pressing step, the upper part presses the bent part of the tip inclined part and the tip bent part while holding the work body having the tip inclined part and the tip bent part bent at a predetermined angle by the lower die. Then, the workpiece is sandwiched between the upper die and the lower die, and the tip bend portion is bent at the upper die and the lower die so that the tip bend portion is in close contact with the tip bevel portion while rotating the tip bevel portion. Is a hemming processing method characterized by bending the workpiece so as to be in the same plane as the plane of the workpiece.

According to the first aspect of the present invention, in the method of hemming a work end of a metal plate by pressing using a lower die and an upper die, the work is bent by hemming of the work end in the first pressing step. A tip bend and a tip bevel on the main body side of the workpiece adjacent to the tip bend, the tip bend is bent upward at a predetermined angle, and the bend of the tip bend is maintained by the lower die. On the other hand, the top bent portion is bent downward in a direction substantially perpendicular to the plane of the workpiece by the upper die. For this reason, the angle of a tip inclination part and a tip bending part can be made smaller than 90 degrees by one press process.

In the second pressing step, the upper part presses the bent part of the tip inclined part and the tip bent part while holding the work body having the tip inclined part and the tip bent part bent at a predetermined angle by the lower die. Then, the workpiece is sandwiched between the upper die and the lower die, and the tip bend portion is bent at the upper die and the lower die so that the tip bend portion is in close contact with the tip bevel portion while rotating the tip bevel portion. Is bent so that it is flush with the plane of the workpiece.

For this reason, if the tip inclined part and the bent part of the tip bent part are pressed with the upper mold and the tip inclined part is rotated, the tip bent part will be removed when the tip of the tip bent part comes into contact with the lower mold. The angle formed by the part and the lower mold is 90 degrees or less. When the bent part of the tip inclined part and the tip bent part is pressed with the upper die, the tip of the tip bent part easily slides on the surface of the lower mold, and the tip bent part is easily moved in the direction of the tip inclined part. It becomes easy to bend.
In addition, by sandwiching the tip inclined portion and the tip bent portion between the upper die and the lower die, the tip inclined portion and the tip bent portion are brought into close contact with each other so that the tip inclined portion is flush with the plane of the workpiece. Can be bent.

The present invention according to claim 2 is the hemming processing method in which the holding portion of the lower mold workpiece is held by a spring and is movable downward.

In the present invention of claim 2, since the holding part of the lower mold work is held by a spring and is configured to be movable downward, when holding the work with the upper mold and the lower mold and bending it, The impact of the upper mold can be absorbed, the press work can be performed smoothly, and the durability of the mold can be improved.

According to the third aspect of the present invention, the upper die used in the first pressing step includes the upper die first block held by the upper die base member with the spring member, and the upper die first member held by the upper die base member. An upper mold second block slidably attached to an end of one block;
The lower mold used in the first pressing step includes a lower mold first block held by a lower mold base member with a spring member, and an end of the lower mold first block held by the lower mold base member A lower mold second block slidably mounted;
In the first pressing process, the upper mold first block is lowered and the workpiece is held by the upper mold first block and the lower mold first block, while the slopes of the side edges of the upper mold first block and the lower mold first are held. Bend the tip inclined part upward at a predetermined angle on the slope of the tip of the two blocks,
Hemming by lowering the upper die second block and bending the tip bent portion downward in a direction substantially perpendicular to the plane of the workpiece while maintaining the tip inclined portion bent by the tip of the upper die second block It is a processing method.

In the present invention of claim 3, the upper die used in the first pressing step is the upper die first block held by the upper die base member with the spring member, and the upper die first member held by the upper die base member. An upper mold second block is slidably attached to the end of one block. For this reason, when an upper mold | type 1st block contact | abuts to a workpiece | work, the impact of the upper mold | type 1st block with respect to a workpiece | work and a 1st upper mold | type 2nd block can be relieve | moderated. Further, the tip inclined portion of the workpiece can be bent by sliding the upper mold second block.

The lower mold used in the first pressing step includes a lower mold first block held by a lower mold base member with a spring member, and an end of the lower mold first block held by the lower mold base member A lower mold second block is slidably attached. Therefore, when the lower mold first block holds the workpiece and the upper mold first block comes into contact with the workpiece, the impact of the upper mold first block on the workpiece and the first upper mold second block can be reduced. it can. Further, the tip bent portion can be bent with respect to the tip slope portion of the workpiece by sliding the lower mold second block.

In the first pressing process, the upper mold first block is lowered and the workpiece is held by the upper mold first block and the lower mold first block, while the slopes of the side edges of the upper mold first block and the lower mold first are held. The tip inclined portion is bent upward at a predetermined angle on the slope of the tip of the two blocks. For this reason, a tip inclination part and a tip bending part can be bent at a predetermined angle in the middle of one press process.

The upper die second block was lowered, and the tip bent portion was bent downward in a direction substantially perpendicular to the plane of the workpiece while maintaining the bending of the tip inclined portion by the tip of the upper die second block. For this reason, when the tip inclined portion and the bent portion of the tip bent portion are pressed by the upper mold second block and the tip inclined portion is rotated, the tip of the tip bent portion comes into contact with the lower mold second block. In some cases, the angle between the tip bent portion and the lower mold second block is 90 degrees or less, and abuts obliquely. Furthermore, when the upper mold first block presses the bent portion of the tip inclined portion and the tip bent portion, the tip of the tip bent portion easily slides on the surface of the lower mold second block, and the tip inclined portion is easily moved to the tip. It becomes easy to bend in the direction of the inclined part.
Further, by sandwiching the workpiece between the upper mold first block and the lower mold second block, it is possible to ensure the bending of the tip inclined portion and the tip bent portion.

According to the present invention of claim 4, in the second press step, the upper die first used in the second press step while holding the workpiece in the lower block first block used in the second press step. The block is lowered, the tip of the tip bent part is brought into contact with the upper surface of the lower die second block used in the second pressing process, and the tip inclined part and the tip bent part of the upper die first block are Pressing the bent part, pinching the tip bent part between the upper block first block and the lower mold second block, and bending the tip bent part so as to be in close contact with the tip inclined part while rotating the tip inclined part This is a hemming method in which the tip inclined portion is bent so as to be flush with the plane of the workpiece.

In the present invention of claim 4, in the second press step, the upper die first used in the second press step while holding the work in the lower block first block used in the second press step. The block is lowered, the tip of the tip bent part is brought into contact with the upper surface of the lower die second block used in the second pressing process, and the tip inclined part and the tip bent part of the upper die first block are Pressing the bent part, pinching the tip bent part between the upper block first block and the lower mold second block, and bending the tip bent part so as to be in close contact with the tip inclined part while rotating the tip inclined part While processing, the tip inclined part was bent so as to be in the same plane as the plane of the workpiece.

For this reason, when the bent portion of the tip inclined portion and the tip bent portion is pressed by the upper mold first block and the tip inclined portion is rotated, the tip of the tip bent portion comes into contact with the lower mold second block. In some cases, the angle between the tip bent portion and the lower mold second block is 90 degrees or less, and abuts obliquely. Further, when the upper inclined portion and the bent portion of the distal bent portion are pressed by the upper mold first block, the distal end of the distal bent portion easily slides on the surface of the lower second mold block, and the distal bent portion can be easily moved. It becomes easy to bend in the direction of the tip inclined portion.
Also, the tip inclined portion and the tip bent portion are held in contact with each other by sandwiching the tip inclined portion and the tip bent portion between the upper block first block and the lower die second block, and the tip inclined portion is the same as the plane of the workpiece. It can be bent to a flat surface.

The present invention of claim 5 is a hemming method in which the width of the tip inclined portion is wider than the width of the tip bent portion.

In the present invention of claim 5, since the width of the tip inclined portion is wider than the width of the tip bent portion, the tip of the tip inclined portion is reliably slid on the surface of the lower mold second block in the second pressing step. It can be moved to perform hemming. In addition, hemming can be performed with the distal bent portion securely attached.

In the first press process, when the tip of the tip bend and the bent part of the tip bend are pressed with the upper die and the tip tilt is rotated, the tip of the tip bend comes into contact with the lower die In this case, the angle between the tip bent portion and the lower mold is 90 degrees or less, and abuts obliquely. Furthermore, in the second press process, when the upper die is pressed against the bent part of the tip inclined part and the tip bent part, the tip of the tip bent part becomes easy to slide on the surface of the lower mold, and the tip is easily bent. It becomes easy to bend the part in the direction of the tip inclined part.
Further, by sandwiching the tip inclined portion and the tip bent portion between the upper die and the lower die, the tip inclined portion can be bent so as to be flush with the plane of the workpiece.

It is sectional drawing before the process of the workpiece | work used with the hemming processing method of embodiment of this invention. It is sectional drawing after a process in the 1st press process of the workpiece | work used with the hemming processing method of embodiment of this invention. It is an expansion perspective view of the bending part after a process by the 1st press process of the workpiece | work used with the hemming processing method of embodiment of this invention. It is sectional drawing after a process by the 2nd press process of the workpiece | work used with the hemming processing method of embodiment of this invention. It is an expansion perspective view of the hemming process part after a process by the 2nd press process of the workpiece | work used with the hemming process method of embodiment of this invention. It is sectional drawing of the state which opened the press die of the press die used for the 1st press process in the hemming processing method of embodiment of this invention. It is sectional drawing of the state which closed the press die of the press die used for the 1st press process in the hemming processing method of embodiment of this invention. It is sectional drawing of the state which opened the press die of the press die used for the 2nd press process in the hemming processing method of embodiment of this invention. It is sectional drawing of the state which closed the press die of the press die used for the 2nd press process in the hemming processing method of embodiment of this invention. It is a schematic diagram of the 1st press process in the hemming processing method of embodiment of this invention, and is sectional drawing of the press metal mold | die before a press work, and a workpiece | work. It is a schematic diagram of the 1st press process in the hemming processing method of embodiment of this invention, and is sectional drawing of the press die and the workpiece | work of the state which bent the front-end | tip inclination part by press work. It is a schematic diagram of the 1st press process in the hemming processing method of embodiment of this invention, and is sectional drawing of the press metal mold | die and the workpiece | work of the state which bent the front end bending part by press work. It is a schematic diagram of the 2nd press process in the hemming processing method of embodiment of this invention, and is sectional drawing of the press die before a press work, and a workpiece | work. It is a schematic diagram of the 2nd press process in the hemming processing method of embodiment of this invention, and is sectional drawing of the press metal mold | die and a workpiece | work in the middle of bending the front-end bending part by press work. It is a schematic diagram of the 2nd press process in the hemming processing method of embodiment of this invention, and is sectional drawing of the press metal mold | die and the workpiece | work of the state which bent the front end bending part by press work. It is the perspective view of the state which bent the front end bending part of the work at right angles in the press process of the work of the conventional hemming processing method. It is a perspective view of the state where the front end bending part of the work was further bent from right angle in the press process of the work of the conventional hemming method. It is a perspective view of the state where the tip bending part of a work was completely bent in the press process of the work of the conventional hemming method.

A method for hemming a terminal of a workpiece of a metal plate by press working using a lower die and an upper die according to an embodiment of the present invention will be described with reference to FIGS.
First, the change of the shape of the terminal of the workpiece of the metal plate processed by the hemming method will be described based on FIGS. 1 to 5, and then the mold used for the hemming method based on FIGS. Further, the steps of the hemming method will be described with reference to FIGS.

As for the shape of the end of the metal plate workpiece processed by the hemming method, first, as shown in FIG. 1, a panel 1 which is a metal plate workpiece is used. The panel 1 processed by the present invention is used, for example, for a car body or a door of an automobile, but can be used for a panel for other purposes.

Next, as shown in FIGS. 2 and 3, the end of the panel 1 that is a work is bent at the front end of the main body of the panel 1 when processed in a first pressing process described later. 5, the tip bend portion 5 is formed between the tip bend portion 5 and the main body of the panel 1, and the tip bend portion 4 is formed continuously with the tip bend portion 5. The tip bent portion 5 is bent downward at the portion of the panel second bent line 3. The front end bent portion 5 is bent at a substantially right angle with the main body surface of the panel 1.

When the panel 1 is processed in the second press process described later, the panel first bent line 2 is flattened and disappears as shown in FIGS. 4 and 5, and the front bent portion 5 is the panel. The panel 2nd bent line 3 is completely bent, the tip inclined portion 4 and the tip bent portion 5 are in close contact with each other, and the hemming process is completed.

Next, the metal mold | die used with the hemming processing method of embodiment of this invention is demonstrated.
The metal mold | die used at the 1st press process mentioned later is comprised from the 1st upper mold | type 10 and the 1st lower mold | type 20, as shown in FIG. 6 and FIG.
The first upper mold 10 includes a first upper mold first block 11, a first upper mold second block 12, a first upper mold third block 13, a first upper mold base member 14, and a first upper mold. A spring member 15 is provided.

The first upper mold first block 11 is formed in a flat plate shape, and the lower surface forms a flat first upper mold first block bottom surface 11b for sandwiching the panel 1, and the first upper mold first block 11 is in contact with the first upper mold second block 12. The end on the contact side is in contact with the first upper mold first block bottom surface 11b, and the first upper mold first block slope 11a is formed in the lower part. The first upper mold first block 11 is attached to the first upper mold base member 14 by the first upper mold spring member 15, and when the first upper mold first block 11 is pressed, It is attached so that it can move in the direction close to it.

The first upper mold third block 13 is formed in a flat plate shape, and is attached in close contact with the first upper mold base member 14. The first upper mold second block 12 is formed in a columnar shape in the vertical direction, passes through the first upper mold third block 13, and is attached to the first upper mold base member 14. The distal end of the first upper mold second block 12 has a first upper mold second block distal end surface 12a formed in a planar shape. When the first upper mold spring member 15 is compressed, the first upper mold second block 12 slides on the end surface of the first upper mold first block 11.

The first lower mold 20 includes a first lower mold first block 21, a first lower mold second block 22, a first lower mold third block 23, a first lower mold base member 24, and a first lower mold. A spring member 25 is provided.
The first lower mold first block 21 is formed in a flat plate shape, and the upper surface forms a flat first lower mold first block upper surface 21b for sandwiching the panel 1, and the first lower mold first block 21 and the first lower mold second block 22 are in contact with each other. A first lower mold first block side end surface 21a is formed at the end on the side in contact with the first lower mold. The first lower mold first block 21 is attached to the first lower mold base member 24 by the first lower mold spring member 25, and when the first lower mold first block 21 is pressed, It is attached so that it can move in the direction close to it.

The first lower mold third block 23 is formed in a flat plate shape and is attached in close contact with the first lower mold base member 24. The first lower mold second block 22 is formed in a column shape in the vertical direction, passes through the first lower mold third block 23, and is attached to the first lower mold base member 24. The tip of the first lower mold second block 22 has a first lower mold second block upper end surface 22a formed in a slope corresponding to the first upper mold first block slope 11a.

When the first upper mold 10 and the first lower mold 20 are open, there is a space between the first upper mold first block 11 and the first lower mold first block 21, as shown in FIG. The first upper mold first block 11 and the first upper mold third block 13 are also separated by the first upper mold spring member 15. The first upper mold first block 11 and the first upper mold third block 13 are also separated by the first upper mold spring member 15. Further, the first lower mold first block 21 and the first lower mold third block 23 are also separated by the first lower mold spring member 25.

When the first upper mold 10 and the first lower mold 20 are closed to press the panel 1, as shown in FIG. 7, the first upper mold first block 11 and the first lower mold first block 21 are The first upper mold first block 11 and the first upper mold third block 13 are in close contact with each other across the panel 1 against the force of the first upper mold spring member 15.

Further, the first lower mold first block 21 and the first lower mold third block 23 are also in close contact with each other against the force of the first lower mold spring member 25. Further, the first upper mold first block slope 11 a and the first lower mold second block upper end surface 22 a are also in close contact with each other with the tip inclined portion 4 of the panel 1 interposed therebetween. At this time, the first lower mold second block 22 slides on the first lower mold first block side end face 21a.

As shown in FIGS. 8 and 9, the mold used in the second pressing process described later is composed of a second upper mold 30 and a second lower mold 40.
The second upper mold 30 includes a second upper mold first block 31, a second upper mold second block 32, and a second upper mold base member 33.

The second upper mold first block 31 is formed in a flat plate shape, and the lower surface forms a flat second upper mold first block bottom surface 31 b for sandwiching the panel 1.
The second upper mold second block 32 is formed in a flat plate shape and is attached in close contact with the second upper mold second block 32. The second upper mold first block 31 is attached in close contact with the second upper mold second block 32. Like the first upper mold 10, the second upper mold first block 31 is attached to the second upper mold second block 32 by the upper mold spring member. It can also be mounted so as to be movable.

The second lower mold 40 includes a second lower mold first block 41, a second lower mold second block 42, a second lower mold third block 43, a second lower mold base member 44, and a second lower mold. A spring member 45 is provided.
The second lower mold first block 41 is formed in a flat plate shape, and the upper surface forms a flat second lower mold first block upper surface 41b for sandwiching the panel 1, and the second lower mold first block 41 and the second lower mold second block 42 are in contact with each other. A second lower mold first block side end surface 41a is formed at the end portion on the side in contact with. The second lower mold first block 41 is attached to the second lower mold base member 44 by the second lower mold spring member 45, and when the second lower mold first block 41 is pressed, the second lower mold base member 44 It is attached so that it can move in the direction close to it.

The second lower mold third block 43 is formed in a flat plate shape and attached in close contact with the second lower mold base member 44. The second lower mold second block 42 is formed in a columnar shape in the vertical direction, passes through the second lower mold third block 43, and is attached to the second lower mold base member 44 by the second lower mold spring member 45. Yes. The tip of the second lower mold second block 42 has a second lower mold second block upper end surface 42a formed in a planar shape corresponding to the right surface of the second upper mold first block bottom surface 31b in FIG. ing.

When the second upper mold 30 and the second lower mold 40 are open, there is a space between the second upper mold first block 31 and the second lower mold first block 41, as shown in FIG. Further, the second lower mold first block 41 and the second lower mold third block 43 are separated by a second lower mold spring member 45.
Further, the second upper mold first block bottom surface 31b and the second lower mold first block upper surface 41b are also separated.

When the second upper mold 30 and the second lower mold 40 are closed to press the panel 1, as shown in FIG. 9, the second upper mold first block 31 and the second lower mold first block 41 are The panel 1 is closely attached. Further, the second lower mold first block 41 and the second lower mold third block 43 are also in close contact with each other against the force of the second lower mold spring member 45.

At this time, the second lower mold first block 41 can move downward as the second lower mold first block side end face 41a and the side surface of the second lower mold second block 42 slide.
Further, the second upper mold first block bottom surface 31 b and the second lower mold second block upper end surface 42 a are also in close contact with the tip inclined portion 4 and the tip bent portion 5 interposed therebetween.

Next, the steps of the hemming method will be described with reference to FIGS.
The process of the hemming method is performed in two steps, a first press process and a second press process.

First, the first pressing process will be described with reference to FIGS.
In the first pressing step, first, the first upper mold 10 and the first lower mold 20 are opened, and the panel 1 shown in FIG. 1 is placed therebetween. The panel 1 is placed on the first lower mold first block upper surface 21b of the first lower mold first block 21, and the widths of the tip inclined portion 4 and the tip bent portion 5, which are the tip portions of the panel 1, are set to be the first. 1 The lower mold is placed so as to protrude from the first block side end surface 21a.

Thereafter, the first upper mold 10 is lowered to sandwich the panel 1 as shown in FIG. At this time, the first upper mold first block inclined surface 11 a of the first upper mold first block 11 and the first lower mold second block upper end surface 22 a of the first lower mold second block 22 are formed on the tip inclined portion 4 of the panel 1. The portion is sandwiched and bent upward at the portion of the panel first bending line 2 as shown in FIG. The portion of the front end bent portion 5 of the panel 1 is in contact with the first upper mold second block front end surface 12a of the first upper mold second block 12 and is slightly bent.

Next, as shown in FIG. 12, when the first upper mold spring member 15 is compressed and lowered, the first upper mold second block 12 and the first upper mold base member 14 of the first upper mold 10 are further lowered. .
Therefore, the side surface of the first upper mold second block 12 descends while sliding the end surface of the first upper mold first block 11 and bending the front bent portion 5 of the panel 1 downward. Then, the portion of the front end bent portion 5 is sandwiched between the side surface at the front end of the first upper mold second block 12 and the side surface at the front end of the first lower mold second block 22, and as shown in FIG. Bend at the bend line 3. Thereby, the 1st press process is complete | finished.

At this time, as shown in FIG. 7, the first upper mold 10 and the first lower mold 20 are compressed by the first upper mold spring member 15 and the first lower mold spring member 25 so that the first upper mold first block 11 and the first upper mold third block 13 are in close contact, and the first lower mold first block 21 and the first lower mold third block 23 are in close contact. By compressing the first upper mold spring member 15 and the first lower mold spring member 25, the first upper mold 10 can be lowered and the impact abutting against the first lower mold first block 21 can be absorbed. .

Next, based on FIGS. 13-15, the 2nd press process is demonstrated.
In the second pressing process, first, the second upper mold 30 and the second lower mold 40 are opened, and the panel 1 bent in the second pressing process shown in FIG. The panel 1 is placed such that the tip inclined portion 4 and the tip bent portion 5 which are tip portions protrude laterally from the tip of the second lower mold first block 41.

Thereafter, the second upper mold 30 is lowered and the body of the panel 1 is sandwiched between the second upper mold first block 31 and the second lower mold first block 41 as shown in FIG. The second upper mold first block bottom surface 31 b pushes the portion of the bending line 3 to rotate the portion of the tip inclined portion 4 around the panel first bending line 2.

Then, the front end bent portion 5 has a front end that is perpendicular to the second lower mold second block upper end surface 42a of the second lower mold second block 42. While being pushed, the second lower mold second block upper end surface 42a is in contact with the second lower mold second block upper end surface 42a while rotating so as to be inclined. For this reason, the bending of the tip bent portion 5 by the second upper mold first block 31 is reliably performed without abnormally deforming the tip bent portion 5.
At this time, the panel 1st bending line 2 is extended and becomes flat.

Next, as shown in FIG. 15, the second upper mold first block 31 of the second upper mold 30 is further lowered while compressing the tip bent portion 5. Then, the second lower mold spring member 45 bends, the second lower mold first block 41 descends, the second lower mold first block upper surface 41b and the second lower mold second block upper end surface 42a coincide, The bending of the tip bent portion 5 is completed. Thereby, the tip inclined portion 4 is extended to be the same as the surface of the main body of the panel 1, and the tip inclined portion 4 and the tip bent portion 5 are in close contact with each other and can be hemmed.

1 Panel (work)
4 Tip inclined portion 5 Tip bent portion 10 First upper die 11 First upper die first block 12 First upper die second block 20 First lower die 21 First lower die first block 22 First lower die second Block 30 Second upper mold 31 Second upper mold first block 40 Second lower mold 41 Second lower mold first block 42 Second lower mold second block 42a Second lower mold second block upper end surface

Claims (5)

In the method of hemming the end of the workpiece of the metal plate by pressing using the lower mold and the upper mold,
In the first pressing step, a tip bent portion that is bent by hemming of the end of the workpiece, a tip inclined portion is provided on the main body side of the workpiece adjacent to the tip bent portion, and the tip inclined portion is provided. Bend upward at a predetermined angle,
Further, while maintaining the bending of the tip inclined portion with the lower die, the upper die is bent downward in a direction substantially perpendicular to the plane of the workpiece with the upper die,
In the second pressing step, while holding the workpiece main body having the tip inclined portion bent at a predetermined angle and the tip bent portion by the lower die, the tip inclined portion and the tip folded portion are held by the upper die. The bent portion of the bent portion is pressed, the workpiece is held between the upper die and the lower die, and the tip bent portion is closely attached to the tip inclined portion while rotating the tip inclined portion. A hemming method comprising bending an upper die and the lower die and bending the tip inclined portion so as to be flush with a plane of the workpiece.   The hemming processing method according to claim 1, wherein the work holding portion of the lower mold is configured to be held by a spring and movable downward. The upper mold used in the first pressing step includes an upper mold first block held by an upper mold base member with a spring member, and an end of the upper mold first block held by the upper mold base member. An upper mold second block slidably attached to the part,
The lower mold used in the first pressing step includes a lower mold first block held by a lower mold base member with a spring member, and an end of the lower mold first block held by the lower mold base member A lower second block that is slidably attached to the part,
In the first pressing step, the upper die first block is lowered and the work is held by the upper die first block and the lower die first block, while the side edge of the upper die first block is held. Bending the tip inclined portion upward at a predetermined angle between the slope of the lower die and the tip of the lower mold second block,
The upper mold second block is lowered, and the distal end bent portion is lowered in a substantially perpendicular direction with respect to the plane of the workpiece while the distal end of the upper mold second block is maintained to bend the tip inclined portion. The hemming processing method according to claim 1 or 2, wherein the hemming method is bent.   In the second pressing step, the upper die first block used in the second pressing step is lowered while holding the workpiece in the lower die first block used in the second pressing step. Then, the tip end of the tip bent portion is brought into contact with the upper surface of the second lower mold block used in the second pressing step, and the tip inclined portion and the tip bent portion are moved by the upper first block. Pressing the bent portion of the portion, holding the tip bent portion between the upper block first block and the lower die second block, and rotating the tip inclined portion while moving the tip bent portion to the tip The hemming processing method according to claim 3, wherein bending is performed so as to be in close contact with the inclined portion, and the tip inclined portion is bent so as to be flush with a plane of the workpiece.   The hemming processing method according to any one of claims 1 to 4, wherein a width of the tip inclined portion is wider than a width of the tip bent portion.