JP2001334328A - Method and apparatus for hemming - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress cost increase by decreasing the number of working units and preventing the increase in the working unit scale, etc., and to shorten working time by enabling concurrent operation of the working units without causing mutual interference of even adjacent working units. SOLUTION: A C-shaped frame 37 is movable with respect to a work W where an outer panel Wo and an inner panel Wi are assembled into each other in the direction approaching to/separating from the work W. At the state that the C-shape frame 37 is advanced and a perhem punch 65 is advanced by a swing cylinder 71 arranged in the C-shape frame 37, a preliminary hemming is conducted for a flange of the outer panel Wo by ascending a hem die 35 with a lifter hydraulic cylinder 61 arranged at a lower part 41 of the C-shape frame 37. Subsequently, at the state that the hem die 35 is descended and then the prehem punch 65 is retreated, final hemming is conducted between the hem die 35 and a hem punch 63 by ascending the hem die 35.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hemming apparatus and a hemming method for performing edge bending on a plate-like work.

[0002]

2. Description of the Related Art Conventionally, in a state in which an inner panel of a back door, which is a panel component of an automobile, and an outer panel are assembled, for example, a hemming process in which the periphery of the outer panel is bent and overlapped with the periphery of the inner panel is shown in FIG. FIG. 26 is a side view, and FIG. 26 is a plan view showing a hemming device.

In this hemming apparatus, a work W is positioned and set on a hem die 3 installed on a base 1 with an outer panel 5 at a lower part and an inner panel 7 at an upper part. The inner panel 7 is positioned and fixed at a position above it by a positioning jig 9 that can move up and down. For the workpiece W positioned in this way,
A plurality of prehem punches 1 installed around the work W
After performing preliminary hemming processing by 1, final hemming processing is performed by the hem punches 13 installed corresponding to the respective prehem punches 11.

Hem punch 13 and pre-hem punch 11
Is operated by a hydraulic cylinder 19 rotatably supported by a bracket 15 fixed to the base 1 via a rotation support shaft 17. That is, the piston rod 21 is advanced by the driving of the hydraulic cylinder 19, and the punch holder 23 having the hem punch 13 at the tip thereof is
The final hemming process is performed by the hem punch 13 by rotating the upper bracket 25 around the rotation support shaft 27 in the direction of arrow A.

On the other hand, prior to the above-mentioned hemming of the hem punch 13, the pre-hem punch 11 is advanced to the workpiece W by the turning operation of the punch holder 23 in the direction of the arrow A to perform preliminary hemming. Later, move back. That is, one hydraulic cylinder 19 continuously performs preliminary hemming by the pre-hem punch 11 and final hemming by the hem punch 13.

As shown in FIG. 26, the processing units Us and Uc including the hem punch 13, the prehem punch 11, and the hydraulic cylinder 19 for driving each of the punches are provided so that they can be formed over the entire circumference of the work W. Four units corresponding to the linear part of the square back door (U
s) and four (Uc) corresponding to the corners, eight in total.

[0007]

However, such a conventional hemming device has the following problems.

(1) Since the hemming process is performed by rotating the punch holder 23, all eight machining units cannot be operated at the same time in order to avoid interference between adjacent machining units. For example, the processing unit Uc at the corner portion is replaced with the processing unit Us at the straight portion.
For example, it is necessary to shift the operation timing between the respective processing units, for example, to start the operation, and as a result, the cycle time of the processing operation becomes longer.

(2) If the portion to be hemmed by one processing unit has a work shape whose vertical position changes along the peripheral edge in FIG. 25, the prehem punch 11
Of the workpiece W, the accuracy of the preliminary hemming becomes unstable, and the machining quality is degraded.

(3) The application direction of the hemming pressure by the hem punch 13 must be set perpendicular to the surface of the work W, and the angle of entry of the prehem punch 11 with respect to the work W must also be properly set. It is difficult and must be designed each time according to the shape of the work, resulting in an increase in cost.

(4) For processing the corner portion, a dedicated small processing unit Uc is required, and the number of processing units is required accordingly, resulting in an increase in cost.

(5) The stroke of the hydraulic cylinder 19 tends to be long, resulting in an increase in the size of the entire processing unit. If the hydraulic cylinder 19 is installed closer to the base 1 in order to shorten the stroke, the driving force increases and the hydraulic cylinder 19 becomes larger.

(6) The hydraulic cylinder 19 mounted on the base 1 via the bracket 15 allows the punch holder 23
Is rotated to generate a hemming pressure, and the base 1 receives the hemming pressure. Therefore, it is necessary to increase the rigidity of the base 1 and the entire processing unit, which results in an increase in the size of the entire processing unit. .

Therefore, the present invention suppresses the cost increase by reducing the number of processing units and preventing an increase in size, and also enables adjacent processing units to operate simultaneously without interference. The purpose is to shorten the working time.

[0015]

According to a first aspect of the present invention, a hem punch is provided on an upper portion of a C-shaped frame, and the hem punch is provided on a base side on which the C-shaped frame is installed. A driving means for raising and lowering the hemmed die between the hemmed die and the lower part of the C-shaped frame so as to perform hemming on a work set on the hemmed die between the hemmed die and a lower portion of the C-shaped frame; Is provided.

According to the hemming device having such a configuration,
By raising the hem die by the driving means, the work on the hem die is hemmed between the hem die and the hem punch on the upper portion of the C-shaped frame.

According to a second aspect of the present invention, in the configuration of the first aspect of the present invention, there is provided a pre-processing position for performing a preliminary hemming process on a work on the hem die by raising the hem die, and a standby position retreated from the pre-processing position. A pre-hem punch that is movable with respect to the C-shaped frame between the positions is provided.

According to the above construction, the hemming die is raised by the driving means in a state where the prehem punch has advanced from the standby position to the preparatory machining position, so that preliminary hemming is performed between the heme die and the prehem punch. .

According to a third aspect of the present invention, in the configuration of the second aspect of the present invention, the prehem punch is provided at the other end of the swing arm having one end rotatable with respect to the C-shaped frame. The C-shaped frame is provided with swing drive means for swinging the prehem punch so as to be movable between a pre-machining position and a standby position.

According to the above construction, the swing arm swings and the pre-hem punch advances and moves above the hem die by driving the swing driving means.

According to a fourth aspect of the present invention, in the configuration of the second aspect, the prehem punch is provided at a leading end of a slide member which is slidable with respect to the C-shaped frame between a pre-machining position and a standby position. The C-shaped frame is provided with slide driving means for sliding the slide member.

According to the above construction, the slide member slides and the pre-hem punch advances and moves above the heme die by driving the slide driving means.

According to a fifth aspect of the present invention, in the configuration of any one of the first to fourth aspects of the present invention, the hem die is installed on a lifter base, and the lifter base is vertically movable with respect to a lifter guide erected on the base. It is provided in.

According to the above configuration, the hem die is guided by the lifter guide together with the lifter base and rises by the driving of the driving means.

According to a sixth aspect of the present invention, in the configuration of the fifth aspect of the present invention, a second hem punch for performing hemming processing on the workpiece set on the hem die by raising the hem die is provided at the portion of the lifter projecting above the lifter base. The configuration is provided on the guide.

According to the above structure, the hemming die is raised by the driving means, so that the work on the hemming die is hemmed between the hemming die and the hemming punch on the upper portion of the C-shaped frame, and at the same time, the hemming die is moved to the hemming die. Hemming is performed between the lifter guide and a second hem punch.

According to a seventh aspect of the present invention, in the configuration of the sixth aspect, the second hem punch moves between a hem processing position located above the hem die and a standby position retracted from the hem processing position. It is provided as possible.

According to the above arrangement, the hem die is raised by the driving means in a state where the second hem punch has advanced from the standby position to the hem processing position, so that the hemming is performed between the hem die and the second hem punch. Processing is performed.

According to an eighth aspect of the present invention, in the configuration of the sixth or seventh aspect, a pre-processing position for performing a preliminary hemming process on a workpiece on the hem die by raising the hem die, and retreating from the pre-processing position. A second prehem punch that can move between the lifter guide and the standby position is provided on a portion of the lifter guide that projects above the lifter base.

According to the above configuration, the heme die is raised by the driving means in a state where the second prehem punch has advanced from the standby position to the preliminary processing position, so that the preliminary heme die is moved between the second prehem punch and the second prehem punch. Hemming is performed.

According to a ninth aspect of the present invention, in the configuration of any one of the first to eighth aspects, the C-shaped frame includes a hemming position where the hem punch is located above the hem die, and a standby position where the hem punch is retracted from the hem processing position. It is provided on a base so as to be movable between positions.

According to the above configuration, the work is set on the hem die in a state where the C-shaped frame is at the standby position, and then the driving of the driving means is performed in a state where the C-shaped frame advances and reaches the hem processing position. The hemming die rises and hemming is performed.

According to a tenth aspect of the present invention, a work is set on a hem die which is mounted on a base so as to be movable up and down, and the pre-hem punch provided on a C-shaped frame is advanced above the work, and After the hemmed die is raised by the driving means provided between the lower portion of the frame and the hemmed die to perform preliminary hemming, the hemmed die is raised by the driving means with the prehem punch retracted, and the C Hemming is performed with a hem punch provided on the upper part of the shaped frame.

According to the above-described hemming method, the hemming process is performed by the driving means on the C-shaped frame, and the hemming is performed by the pre-hem punch and the hem punch provided on the C-shaped frame.

According to an eleventh aspect of the present invention, in the method according to the tenth aspect of the present invention, the lifter base on which the hemmed die is installed is:
The second prehem punch provided on the lifter guide at a portion protruding above the lifter base is provided so as to be vertically movable with respect to the lifter guide erected on the base, and the workpiece is simultaneously moved with the prehem punch. Preliminary hemming is performed, and the prehem punch is retracted, and the hemming is performed at the same time as the hem punch in a state where the second hem punch provided on the lifter guide at a portion protruding above the lifter base is advanced.

According to the above-mentioned hemming method, the hemming die is raised by the driving means on the C-shaped frame, whereby the hemming is performed by the pre-hem punch and the hem punch provided on the C-shaped frame, and at the same time, the lifter guide is provided. The hemming process is performed by the second prehem punch and the second hem punch provided in the above.

[0037]

According to the first aspect of the present invention, the hemmedy and the C
By driving the hemmed die by the driving means provided between the lower part of the shaped frame and the hemmed die, the work on the hemmed die is subjected to the hemming process between the hemmed die and the hem punch on the upper part of the C-shaped frame. As the hemming pressure,
Since a pushing force from below is generated in the C-shaped frame, an overload is not applied to the base side, and it is possible to prevent an increase in the size of the entire hemming apparatus due to an increase in rigidity of the base side. In addition, since the hemming die is a direct-acting system that rises at the time of hemming processing, the processing units do not interfere with each other even when adjacent processing units operate simultaneously, thereby shortening the cycle time of the processing operation. At the same time, the processing of the corner portion can be performed by the processing unit for processing the linear portion, and the processing unit dedicated to the corner portion is not required, so that the total number of processing units can be reduced and the cost can be reduced. Furthermore, since the hemmed die is linear, the stroke of the driving means can be set short, and the hemming pressure can be easily set at right angles to the surface of the work, so that standardization becomes easy and cost reduction can be achieved.

According to the second aspect of the present invention, when the prehem punch is advanced from the standby position to the preprocessing position and the heme die is raised, preliminary hemming is performed between the heme die and the prehem punch. Because it was
The angle of entry of the pre-hem punch into the workpiece is substantially horizontal, perpendicular to the upward movement of the hemmed die. As a result, regardless of the shape of the workpiece, the preliminary hemming is stabilized, and the quality of the hemming is improved. In addition to this, it is possible to avoid a variation in the angle of entry of the prehem punch with respect to the work, thereby facilitating standardization and reducing costs.

According to the third aspect of the present invention, the swing arm swings and the pre-hem punch advances and moves above the hem die by the driving of the swing driving means provided on the C-shaped frame. Can be reliably performed by raising the hemmedy.

According to the fourth aspect of the present invention, by driving the slide driving means provided on the C-shaped frame, the slide member slides with respect to the C-shaped frame, and the pre-hem punch advances and moves above the hem die. Preliminary hemming can be reliably performed by raising the hem die.

According to the fifth aspect of the present invention, the hem die is installed on the lifter base, and the lifter base is provided so as to be vertically movable with respect to the lifter guide erected on the base. The hemming die is guided by the lifter guide together with the lifter base and rises, so that the hemming process can be performed accurately.

According to the sixth aspect of the present invention, since the second hem punch for performing the hemming process on the work set on the hem die by raising the hem die is provided on the lifter guide at a portion protruding above the lifter base. For example, the work can be set so that the lifter guide is located in the window frame of the door of the car, and the hemming process can be performed on the work from the window frame at the same time as the hemming process on the outer peripheral portion of the work. Need not be performed in a separate process, so that the working time can be reduced and the equipment cost can be reduced.

According to the seventh aspect of the present invention, the second hem punch is provided so as to be movable between a hem processing position located above the hem die and a standby position retracted from the hem processing position. By setting the second hem punch to the standby position, the work of setting the work on the hem die becomes easy, and by setting the second hem punch to the hem processing position after the work is set, the hemming processing for the work is reliably performed. Can be done.

According to the eighth aspect of the present invention, it is possible to move between a pre-machining position for performing preliminary hemming of a workpiece on the hemmed die by raising the hemmed die and a standby position retracted from the pre-processed position. Since the second prehem punch is provided on the lifter guide at a portion protruding above the lifter base, setting the second prehem punch to the standby position facilitates the work of setting the work on the hem die, and setting the work Later, the second prehem punch is advanced to the hemming position, so that the preliminary hemming of the work can be reliably performed.

According to the ninth aspect of the present invention, the C-shaped frame is mounted on the base such that the hem punch can move between the hem processing position where the hem punch is located above the hem die and the standby position where the hem punch is retracted from the hem processing position. , So C
By setting the shaped frame to the standby position, the work of setting the work on the hemmed die becomes easy, and by setting the C-shaped frame forward to the hemmed processing position after setting the work, the hemming work on the work can be reliably performed. .

According to the tenth aspect of the present invention, a work is set on a hem die which is mounted on a base so as to be vertically movable, and a pre-hem punch provided on a C-shaped frame is advanced above the work. After the hemmed die is raised by the driving means provided between the lower part of the shaped frame and the hemmed die and preliminary hemming is performed, the hemmed die is raised by the driving means with the prehem punch retracted, and the C-shaped frame is formed. Since the hemming process is performed between the hem punch and the hem punch provided at the top, as the hemming pressure, a thrust from below is generated in the C-shaped frame, and overload is applied to the base side. As a result, it is possible to prevent an increase in the size of the entire hemming device due to enhancement of rigidity on the base side. In addition, since the hemming die is a direct-acting system that rises at the time of hemming processing, the processing units do not interfere with each other even when adjacent processing units operate simultaneously, thereby shortening the cycle time of the processing operation. At the same time, the processing of the corner portion can be performed by the processing unit for processing the linear portion, and the processing unit dedicated to the corner portion is not required, so that the total number of processing units can be reduced and the cost can be reduced. Furthermore, since the hemmed die is linear, the stroke of the driving means can be set short, and the hemming pressure can be easily set at right angles to the surface of the work, so that standardization becomes easy and cost reduction can be achieved. In addition, the angle of entry of the prehem punch into the workpiece is substantially horizontal, which is perpendicular to the upward movement of the hemmed die. As a result, the preliminary hemming is stabilized regardless of the workpiece shape, and In addition to the above, the variation in the angle of entry of the prehem punch with respect to the workpiece can be avoided, standardization becomes easy, and the cost can be reduced.

According to the eleventh aspect of the present invention, the lifter base on which the hem die is installed is provided so as to be vertically movable with respect to the lifter guide erected on the base, and the lifter guide at a portion protruding above the lifter base. The second provided in
In the state where the prehem punch is advanced, a preparatory hemming process is performed on the work at the same time as the prehem punch, and the prehem punch is retracted, and the second hem punch provided on the lifter guide at a portion protruding above the lifter base is provided. Since the hemming process is performed at the same time as the hem punch in the forward state, the work can be set such that the lifter guide is positioned in the window frame of the car door, for example, and the hemming process is performed on the work from within the window frame. This can be performed simultaneously with the hemming process on the outer peripheral portion of the work, and there is no need to perform the hemming process from the inside of the window frame in a separate process, so that it is possible to achieve a reduction in working time and a reduction in equipment costs.

[0048]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of a hemming device according to an embodiment of the present invention, taken along the line BB of FIG. 2, and FIG. 2 is a plan view of the hemming device. The work W to be hemmed by the hemming device is a so-called sash door, which is a rear door of an automobile and has a window frame formed separately from a door body. Hemming is performed on the periphery of the work W by four processing units U ₁ , U ₂ , U ₃ , and U ₄ . These four machining units U ₁ ~U ₄ is basically the same to each other, will be described here with reference to processing unit U ₁ which is located on the left side in FIG. 1.

As shown in FIG. 1, a lifter base 33 is provided on a plurality of lifter guides 31 erected on a base 29 so as to be movable up and down together with a cylindrical guide bush 32. A heme die 35 serving as a mold is provided. A work W in a state where the outer panel Wo and the inner panel Wi are assembled is set on the hem die 35. At this time, the outer panel Wo is set on the hem die 35, and the inner panel Wi on the outer panel Wo is positioned by a positioning jig (not shown).

On the base 29 around the lifter base 33, a C-shaped frame 37 is provided via a guide rail 39 so as to be movable toward and away from the hem die 35 (in the horizontal direction in FIG. 1). The C-shaped frame 37 mainly includes a lower portion 41 on the guide rail 39 side, a main portion 43 extending upward from the lower portion 41, and an upper portion 45 extending rightward from the upper end of the main portion 43. The position of the C-shaped frame 37 shown in FIG. 1 is a forward limit position, and this forward limit position corresponds to a hemming position, and a position retracted leftward from the hemming position in FIG. Become.

As shown in FIG. 2, a plurality (two in this case) of the C-shaped frames 37 are provided in one processing unit, and the two C-shaped frames 37 are mutually connected by the horizontal plate 47 and the vertical They are connected by a connecting tool composed of a plate 49.

Base 2 between two C-shaped frames 37
9 on the slide cylinder 5 via a bracket 51.
3, the tip of the piston rod 55 of the slide cylinder 53 is connected to a connecting plate 57 that connects the lower portions of the two C-shaped frames 37 to each other. That is, the C-shaped frame 37 slides on the base 29 along the guide rail 39 by driving the slide cylinder 53.

On the upper surface of the lower portion 41 of the C-shaped frame 37,
A plurality of lifter hydraulic cylinders 61 as driving means are provided via a cylinder support plate 59 extending in a direction perpendicular to the plane of FIG. Hydraulic cylinder for lifter 6
One piston rod 62 extends upward, and its tip is slidably connected to the lower surface of the lifter base 33 in the left-right direction in FIG. That is, the hem die 35 moves up and down together with the lifter base 33 by driving the lifter hydraulic cylinder 61.

A hem punch 63 extending in a direction perpendicular to the paper surface of FIG. 1 is fixed to an upper end 45 of the upper portion 45 of the C-shaped frame 37 by bolts (not shown). A stepped portion 45a, whose lower side is notched, is formed on the tip end surface of the upper portion 45, and the upper surface of the hem punch 63 abuts on the lower surface of the stepped portion 45a to restrict upward movement.

Prior to performing final hemming by the hem punch 63, a prehem punch 65 for performing preliminary hemming is attached to the upper end of the swing arm 67 by a bolt (not shown). The two swing arms 67 are located between the two C-shaped frames 37 and are arranged in a direction perpendicular to the plane of FIG. 1. Can be rotated about the center.

When the swing arm 67 is at the position indicated by the solid line in FIG.
In this state, the workpiece W is subjected to preliminary hemming processing between the workpiece and the hem punch 63, and corresponds to a preliminary processing position. On the other hand, the position shown by the two-dot chain line in a state of being retracted from the preliminary processing position shown by the solid line is a standby position.

The swing operation of the swing arm 67 is performed by a swing cylinder 71 as a swing driving means. The swing cylinder 71 is attached to a cylinder mounting bracket 73 mounted on a vertical plate
5 so as to be rotatable. The tip of the piston rod 75 of the swing cylinder 71 is rotatably connected to a connecting member 77 that connects the two swing arms 67 via a connecting shaft 79.

Next, the operation of the timing device to the configuration described above will be described with reference also to FIG. 3 to FIG. 11, the operation of which is performed simultaneously in all the processing units U ₁ ~U _4. First, the C-shaped frame 37 is retracted from the state of FIG. 1 to the standby position, and the prehem punch 65 is also moved to the standby position.
The workpiece W is set on the hemmed die 35 in the state where the workpiece W is at the standby position indicated by the two-dot chain line (FIG. 3). This work setting work is easy because the C-shaped frame 37 is at the standby position away from the hemmed die 35. At this time, the outer peripheral edge of the outer panel Wo is substantially 9
It is assumed that the flange F is formed by bending at an angle of 0 degrees.

The processing unit on the right side in FIGS.
U_ThreeAs for the C-shaped frame 37 on the base 29
The processing unit is fixed to
U _ThreeAlso other processing unit U₁, U₂, U₄alike,
The C-shaped frame 37 moves between the hemming position and the standby position.
The work W can be set on the hemmed die 35 by being movable.
Work becomes easier.

From the state shown in FIG.
3, the C-shaped frame 37 is moved forward to the hemming position of FIG. 1, the hem punch 63 is positioned above the hem die 35, and the swing arm 67 is rotated by the swing cylinder 71, so that the pre-hem punch 65 is moved. It is advanced to the pre-processing position indicated by the solid line in FIG. 1 and positioned above the hemmed die 35 (FIG. 4).

Next, the lifter hydraulic cylinder 61
The hemming die 35 is lifted together with the work W via the lifter base 33, and the flange F of the outer panel Wo is brought into contact with the prehem punch 65 to perform preliminary hemming. Thus, the flange F is bent at about 45 degrees (FIG. 5).

When performing the above-mentioned preliminary hemming,
Since the pre-hem punch 65 enters from a lateral direction substantially perpendicular to the upward moving direction of the hem die 35, the work W
Irrespective of the shape, the angle of entry with respect to the workpiece W is made uniform, and the processing quality is improved.

Next, the lifter hydraulic cylinder 61
After the hem die 35 is lowered together with the work W (FIG. 6), the pre-hem punch 6 is moved by the swing cylinder 71.
5 is retracted to a standby position (FIG. 7). Thereafter, the hemming die 35 is raised by the lifter hydraulic cylinder 61, and the flange F preliminarily machined at about 45 degrees is brought into contact with the hem punch 63, thereby completing the final hemming process (FIG. 8). ).

At this time, since the hemming die 35 is lifted, a hemming process is performed between the hemming die 35 and the hem punch 63 attached to the C-shaped frame 37, so that the hemming pressure is received in the C-shaped frame 37. And base 2
No overload is applied to the 9 side, and it is not necessary to particularly increase the rigidity of the base 29 side, and it is possible to prevent the entire apparatus from being enlarged. Thereafter, the hemmed die 35 is lowered to return to the original position (FIG. 9), the C-shaped frame 37 is also retracted to the standby position (FIG. 10), and the work W is taken out (FIG. 11).

According to the above-described hemming device, both the prehem punch 65 and the hem punch 63 are waiting at the upper side during processing, and the punches 65 and 6 waiting at the time are processed.
Since 3 Hemudai 35 relative to perform machining by straight movement upwards, be operated machining unit U ₁ ~U ₄ adjacent at the same time, upon not interfere with each other, timing and to the protection of a short stroke Since the final hemming process can be performed continuously, the cycle time of the working operation can be reduced. In addition, since the hemming die 35 is of the direct-acting type, the hemming pressure can be easily set at a right angle to the surface of the work W, and the angle of entry of the prehem punch 65 with respect to the work W is limited from the lateral direction as described above. Therefore, standardization as a processing unit is facilitated, and cost reduction is achieved.

Further, since the lifter hydraulic cylinder 61 is raised almost immediately below the portion where the work W is to be hemmed, the hemming pressure can be efficiently applied to the work W and the hemming pressure can be applied to the corner of the work W. Processing can be performed by, for example, the units U ₁ and U ₂ adjacent to each other in FIG. 2, and a processing unit dedicated to a corner portion is not required. As a result, the number of processing units can be reduced, and cost can be reduced. .

Further, since the hemming pressure can be changed by appropriately changing the number of lifter hydraulic cylinders 61 in one processing unit, a pressure converter or the like becomes unnecessary, and the hydraulic device can be simplified. The pre-hem punch 65 in the above embodiment is replaced with the swing arm 67 and the slide cylinder 71 for moving between the pre-processing position and the standby position, and the C-shaped frame 3 in FIG.
A slide member that slides in the left-right direction with respect to the slide member 7 and a slide drive unit that drives the slide member.
It may be provided on the shaped frame 37.

For hemming the so-called waist (the right edge in FIGS. 1 and 2), which is the portion where the window frame is attached to the work W, the outer panel Wo is used for the outer panel Wo and the inner panel Wi. It is necessary to form a gap between the outer panel Wo and the inner panel Wi by bending the outer panel Wo and the inner panel Wi. Therefore, in this case, the right end of the inner panel Wi in FIGS. 1 and 2 is set at a position where it does not interfere with the hem punch 63.

FIG. 12 is a sectional view of a hemming device according to another embodiment of the present invention, taken along the line CC in FIG. 13, and FIG. 13 is a plan view of the hemming device. The workpiece W to be hemmed by the hemming device is a rear door of an automobile, and an outer panel Wo in which the window frame portion Ww is on the door body side.
This is a so-called full door integrally formed with the door.

In this embodiment, a processing unit Uw for performing hemming processing on the above-described waist portion located in the window frame of the full door is newly provided. However, hemming processing is performed on the outer peripheral portion of the work W here.
Similar machining unit and the machining unit _U 1 ~U ₄ which is shown in FIG. 2 includes five _U 1 ~U _5.

The processing unit Uw is provided at the upper end of a portion of the lifter guide 31 that guides the lifter base 33 so as to be able to move up and down and protrudes upward from the lifter base 33. Here, as shown in FIG. 13, a waist hem bracket 81 in the processing unit Uw is fixed to the upper ends of the three lifter guides 31. The waist hem bracket 81 is set to be large enough to enter the inside of the window frame portion Ww of the work W. FIG. 14 is a diagram showing the processing unit Uw provided at the upper end of the lifter guide 31 in FIG.
FIG.

The above-mentioned waist hem bracket 81 includes a second hem punch 83 and a second pre-hem punch 85.
Are movably provided in the left and right directions in FIG. The second hem punch 83 is formed by a hem cylinder 87 and two guide shafts 86 attached to the waist hem bracket 81, from a hem processing position located above the hem die 35 shown in FIG. 12 and moves to the standby position which has receded rightward. The second prehem punch 85 is a prehem cylinder 88 attached to the waist hem bracket 81 and arranged along a direction perpendicular to the plane of FIG.
The two guide shafts 89 move between a pre-machining position located above the hemmed die 35 shown in FIG. 12 and a standby position retracted rightward in FIG. 12 from the pre-machining position.

On the lower surface of the waist hem bracket 81 above the second hem punch 83, there is provided a shim 91 for receiving hem pressure by the waist hem bracket 81, and on the upper surface of the second prehem punch 85. And a shim 93 for receiving the hem pressure by the waist hem bracket 81 via the second hem punch 83.

Next, the operation of the hemming device having the above-described configuration will be described.
15 to 24 showing the operation of the processing unit Uw.
The operation will be described with reference to all the processing units U.₁
~ U ₅And Uw at the same time.
Processing unit U₁~ U₅Is shown in FIG.
Processing unit U in the embodiment₁~ U₄Same as
You. 15 to 24, the outer panel Wo and the inner panel
Figure Reinforce Wr interposed between Napanel Wi
Is shown.

FIG. 15 shows a state in which the work W is set on the hemmed die 35, which corresponds to the state shown in FIG. In this case, since the second second hem punch 83 and the second prehem punch 85 are retracted to the standby position, the setting work of the work W is easy. In this state, the C-shaped frame 37 is advanced by the slide cylinder 53 to the hemming position shown in FIG. 12, and the processing units U _{1 to} U ₅
At the same time as the state shown in FIG. 4, the prehem cylinder 88 is operated to advance the second prehem punch 85 to the pre-processing position and to position the second prehem punch 85 above the hem die 35 (FIG. 16). At this time, the second prehem punch 85
Is a gap S between the outer panel Wo and the inner panel Wi.
It is in a state of having entered.

Next, the lifter hydraulic cylinder 61
At the same time as the preliminary hemming in FIG. 5 performed by raising the hem die 35 together with the work W via the lifter base 33, the preliminary hemming is performed by bringing the flange F of the outer panel Wo into contact with the second prehem punch 83. (FIG. 17). As a result, the flange F at the waist portion is also approximately 45
Bending process.

Thereafter, the hem die 35 is lowered together with the work W by the lifter hydraulic cylinder 61 as shown in FIG. 6, and then the pre-hem punch 65 is retracted by the swing cylinder 71.
1 is retracted to the standby position (FIG. 1).
8). Subsequently, the hem die 35 is raised by the hydraulic cylinder 61 for the lifter. Here, the second hem punch 83 is inserted into the gap S into which the window glass (not shown) formed between the outer panel Wo and the inner panel Wi is inserted. It is raised to an intermediate position so that it can enter (FIG. 19).

In this state, the hem cylinder 87 is operated to advance the second hem punch 83 from the standby position to the hem machining position (FIG. 20). Simultaneously with the final hemming operation by bringing the pre-processed flange F into contact with the hem punch 63, the pre-processed flange F is raised to about 45 degrees by the elevation of the hem die 35 so that the second hem punch 83 and superimposed on the end of the reinforcement Wr to complete the final hemming process (FIG. 21).

Then, after lowering the hem die 35 to the intermediate position in FIG. 19, the second hem punch 83
Is retracted to the standby position (FIG. 22). Then, after the operation in FIG. 9, that is, the hem die 35 is lowered to the original position (FIG. 23), the C-shaped frame 37 is also retracted to the standby position, and then, as in FIG. The work W is taken out (FIG. 24).

According to the above-described hemming device, the processing unit Uw including the second hem punch 83 and the second pre-hem punch 85 is installed at a portion of the lifter guide 31 projecting above the lifter base 33, so that it comprises a rear door. The work W can be set so that the processing unit Uw is located within the window frame Ww of the work W. The hemming for waist portion of the workpiece W from the window frame portion Ww according to the order processing unit Uw, and can simultaneously by the processing unit U ₁ ~U ₅ and hemming to the workpiece outer circumference, the hemming from the window frame portion Ww There is no need to perform the processing in a separate step, so that it is possible to achieve a reduction in working time and a reduction in equipment costs.

[Brief description of the drawings]

FIG. 1 is a sectional view of a hemming device according to an embodiment of the present invention, taken along the line BB of FIG. 2;

FIG. 2 is a plan view of the hemming device of FIG. 1;

FIG. 3 is an operation explanatory view showing a state in which a work is set on a hem die in the hemming device of FIG. 1;

FIG. 4 is an operation explanatory view showing a state where the prehem punch has also advanced from the state of FIG. 3 following the advance of the C-shaped frame.

FIG. 5 is an operation explanatory view showing a state in which a hemming die rises from the state of FIG. 4 to perform preliminary hemming.

FIG. 6 is an operation explanatory view showing a state where the hemmed die is lowered from the state of FIG. 5;

FIG. 7 is an operation explanatory view showing a state in which the prehem punch has receded from the state in FIG. 6;

8 is an operation explanatory view showing a state where the hemming die is raised from the state of FIG. 7 to perform a final hemming process.

FIG. 9 is an operation explanatory diagram showing a state where the hemmed die has been lowered to the original position from the state of FIG. 8;

FIG. 10 is an operation explanatory view showing a state in which the C-shaped frame is retracted from the state of FIG. 9;

11 is an operation explanatory view showing a state in which a work is taken out from the state of FIG. 10;

FIG. 12 is a sectional view of a hemming device according to another embodiment of the present invention, taken along line CC of FIG. 13;

FIG. 13 is a plan view of the hemming device of FIG.

FIG. 14 shows a processing unit of the hemming device of FIG. 12;
2 is a left side view of FIG.

FIG. 15 is an operation explanatory view showing a state in which a work is set on a hem die in the hemming device of FIG. 12;

FIG. 16 is an operation explanatory view showing a state where the second prehem punch has also advanced from the state in FIG. 15 following the advance of the C-shaped frame.

FIG. 17 is an operation explanatory view showing a state where the hemming die is raised from the state of FIG. 16 to perform preliminary hemming.

FIG. 18 is an operation explanatory view showing a state where the hem die descends from the state of FIG. 17 and the second prehem punch retreats.

FIG. 19 is an operation explanatory diagram showing a state where the hemmed die has risen to an intermediate position from the state of FIG. 18;

20 is an operation explanatory diagram showing a state where the second hem punch has advanced from the state of FIG. 19;

21 is an operation explanatory diagram showing a state where the hemming die is raised from the state of FIG. 20 to perform a final hemming process.

FIG. 22 is an operation explanatory view showing a state where the heme die has been lowered to the intermediate position and the second hem punch has been retracted from the state of FIG. 21;

FIG. 23 is an operation explanatory view showing a state where the hemmed die has been lowered to the original position from the state of FIG. 22;

24 is an operation explanatory view showing a state in which the work is taken out after the C-shaped frame has retreated to the standby position after the state of FIG. 23;

FIG. 25 is a side view of a hemming device showing a conventional example.

FIG. 26 is a plan view of the hemming device of FIG. 25.

[Explanation of symbols]

 29 Base 31 Lifter guide 33 Lifter base 35 Hem die 37 C-shaped frame 61 Lifter hydraulic cylinder (drive means) 63 Hem punch 65 Prehem punch 67 Swing arm 71 Swing cylinder (Swing drive means) 83 Second hem punch 85 Second prehem punch W Work

Claims (11)

[Claims] 1. A hem punch is provided on an upper portion of a C-shaped frame, while a base side on which the C-shaped frame is installed is provided with:
A hem die that can move up and down is provided to move toward and away from the hem punch, and the hem die is raised between the hem die and the lower part of the C-shaped frame so as to perform hemming processing on a work set on the hem die. A hemming device comprising a driving unit. 2. A preliminary machining position for performing preliminary hemming on a workpiece on the hemmed die by raising the hemmed die;
2. The hemming apparatus according to claim 1, further comprising a prehem punch that is movable with respect to the C-shaped frame between the preparatory processing position and a standby position retracted. 3. A pre-hem punch is provided at one end of a swing arm having one end rotatable with respect to a C-shaped frame. The pre-hem punch moves the pre-hem punch between a pre-processing position and a standby position. 3. The hemming device according to claim 2, wherein a swing driving means for swinging so as to be movable is provided on the C-shaped frame. 4. A pre-hem punch is provided at a tip of a slide member which is slidable with respect to a C-shaped frame between a pre-machining position and a standby position. The hemming device according to claim 2, wherein the hemming device is provided on a frame. 5. The hemmed die is set on a lifter base,
5. The hemming apparatus according to claim 1, wherein the lifter base is provided to be vertically movable with respect to a lifter guide erected on the base. 6. The lifter guide according to claim 5, wherein a second hem punch for performing hemming processing on the work set on the hem die by raising the hem die is provided on the lifter guide at a portion protruding above the lifter base. Hemming device. 7. The hem punch according to claim 6, wherein the second hem punch is movable between a hem processing position located above the hem die and a standby position retracted from the hem processing position. The hemming device as described. 8. A preliminary machining position for performing preliminary hemming on a workpiece on the hemmed die by raising the hemmed die;
8. The hemming according to claim 6, wherein a second prehem punch that can move between the pre-processing position and a standby position retracted from the preliminary processing position is provided on a lifter guide at a portion protruding above the lifter base. apparatus. 9. The C-shaped frame is provided on a base so as to be movable between a hemming position where the hem punch is located above the hem die and a standby position retracted from the hem processing position. 9. The method according to claim 1, wherein:
The hemming device according to any one of the above. 10. A work is set on a hem die that is vertically movable on a base, and a prehem punch provided on a C-shaped frame is advanced above the work.
After the hemmed die is raised by the driving means provided between the lower portion of the C-shaped frame and the hemmed die to perform preliminary hemming, the hemmed die is raised by the driving means in a state where the prehem punch is retracted. And a hem punch provided on an upper portion of the C-shaped frame. 11. A second prehem punch, wherein a lifter base on which a hem die is installed is provided so as to be vertically movable with respect to a lifter guide erected on the base, and is provided on the lifter guide at a portion protruding above the lifter base. In the state where the pre-hem punch is moved forward, a preliminary hemming process is performed on the work at the same time as the pre-hem punch, the pre-hem punch is retracted, and the second hem punch provided on the lifter guide in a portion protruding above the lifter base is advanced. The hemming method according to claim 10, wherein the hemming process is performed simultaneously with the hem punch in a state where the hemming is performed.