JPS6144572B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an apparatus for hemming, which is one of the means for joining a plurality of plates to each other, and is particularly applicable to hemming of a plurality of types of workpieces. This invention relates to facilitating setup changes when performing hemming processing.

BACKGROUND TECHNOLOGY Hemming is a process in which the edges of a first plate are bent at right angles in advance to form a joint, and a second plate to be joined to the first plate is attached to another plate to be joined alone or at the same time. This method joins multiple plates to each other by stacking them together and then bending the joint onto the edge of the second plate. It is widely used in the manufacture of car doors, bonnets, and other body components. There is. This hemming process generally involves a pre-bending process in which the edge of a first plate is beveled at an acute angle to the edge of a second plate, and then the beveled joint is completely bent down to form a second plate. Normally, this is done in two stages: final bending, in which the edge of the plate is strongly sandwiched between the first plate and the first plate. Therefore, when performing both preliminary bending and main bending with one hemming device, the preliminary bending blade is first applied to the workpiece supported by the lower die to perform preliminary bending. After retracting the preliminary bending blade, the main bending blade is activated to perform the main bending.

In order to perform such hemming processing, conventionally, a hemming device is used in which a lower die, a preliminary bending blade, a preliminary bending blade drive device, a main bending blade, a main bending blade drive device, etc. are permanently assembled to the main body frame. was. Publication No. 52-30362 and Publication No. 52-
Publication No. 31722 describes a hemming device that uses a common actuator as a drive source for the preliminary bending blade drive device and the main bending blade drive device to reduce costs and improve work efficiency. Each of the above components is permanently assembled into one frame, and it is not possible to process multiple types of products with different shapes and dimensions.

Problems to be Solved by the Invention However, in recent years, even for mass-produced products such as automobiles, it has become necessary to manufacture a wide variety of products according to user preferences, and it has become necessary to manufacture a wide variety of products to suit the preferences of users. If such a device is used, equipment costs will inevitably increase, and the flow of workpieces will become complicated, resulting in a decrease in work efficiency.

Means for Solving the Problems In order to solve this problem, the present invention separates the lower die, preliminary bending blade, main bending blade, etc. from the drive source to form a hemming die, and also integrates this hemming die into a unit. The hemming device can be easily attached to and detached from the main body of the hemming device, and by exchanging hemming dies, it is possible to hem a plurality of types of workpieces efficiently and at low cost.

More specifically, a hemming device that joins both plates by bending a joint where the edge of a first plate is directly bent onto the upper edge of a second plate overlaid on the first plate. is separated into a hemming device main body and a hemming mold that can be detached therefrom, and the hemming device main body is separated into (a) a frame,
(b) a fixed member fixed to the frame; (c) a movable member provided so as to be able to linearly approach and separate from the fixed member; and (d) a movable member provided to the frame to drive the movable member. (e) The hemming molds are disposed facing each other and connected so as to be relatively close to each other and separated from each other by a plurality of guide posts, and a fixing member of the hemming device main body. and (f) an upper base and a lower base arranged between the movable member and brought closer to each other by the approach of these two members, and (f) the first and second plate members attached to the lower base and superimposed on each other. and (g) a spare part that is retracted after approaching the lower mold to incline the joint part bent at right angles to form an acute angle with the edge of the second plate. a preliminary bending blade that performs a bending movement;
(h) Provided on the lower base to hold a pre-bending blade, and in conjunction with a member provided on the frame or the upper base, convert the approaching/separating movement of the upper base and the lower base into a pre-bending movement. a motion converting mechanism; (i) a main bending blade attached to the upper base and working together with the lower die to bend the inclined joint onto the edge of the second plate; This includes:

Actions and Effects As described above, the hemming device according to the present invention has the following features:
Since the hemming mold is removable from the hemming device main body, by preparing a plurality of hemming molds and replacing them as appropriate, it is possible to perform hemming on a plurality of types of workpieces. In other words, the main body of the hemming device, which is the most expensive of all hemming devices, can be used in common for multiple types of workpieces, which has the effect of significantly reducing equipment costs compared to conventional hemming devices. It will be done. In addition, the removed hemming die can be stored off-line, and the flow of workpieces does not become complicated, which improves production efficiency.

Moreover, the upper base and the lower base, on which the lower die, preliminary bending blade, motion conversion mechanism, main bending blade, etc. are assembled, are connected by a plurality of guide posts so that they can approach and separate from each other, and the hemming device main body Since the relative position of both bases does not change even when removed from the hemming device, there is no need to perform adjustment work the next time it is attached to the hemming device main body, making it easy to change setups when the type of workpiece changes. Therefore, from this point as well, the effect of improving work efficiency can be obtained.

In addition, the hemming type not only includes an upper base and a lower base that are connected to each other so as to be able to approach and separate by a plurality of guide rods as described above, but also include a hemming device main body that is attached to a fixed member fixed to the frame. It includes a movable member driven by a pressure device, and a hemming die is attached between these movable members and a fixed member, so there is no action between the main bending blade and the lower die during main bending. The reaction force of the pressurizing force is received by the frame of the hemming device main body, and the hemming mold itself can be made to have relatively low rigidity. Therefore, the manufacturing cost of a plurality of hemming dies, which must be prepared, is reduced, and the hemming dies are lightweight, making it easy to attach and detach them.

It should be noted that a considerable portion of the reaction force of the force applied by the pre-bending blade to the workpiece during pre-bending may be received by the hemming mold, but the pre-bending is bent at right angles. Since it is sufficient to simply deform and tilt the joint, this reaction force is significantly smaller than that required during actual bending, which requires strong pressure, and is hardly a problem.

Embodiment Hereinafter, an embodiment of the present invention will be described in more detail based on the drawings.

In FIG. 1, 1 is the lower base and 2 is the upper base. The lower base 1 and the upper base 2 are substantially rectangular members, and guide tubes 3 (only one is shown) are vertically fixed to the two diagonal corners of the lower base 1 and the upper base 2. A mounting rod 4 is slidably inserted therethrough. The lower end of this rod 4 is fixed to the lower base 1 by a pin 5, whereby the lower base 1 and the upper base 2 are connected so that they can approach and separate from each other. The rod 4 is designed to function as a guide post. The distance between the lower base 1 and the upper base 2 beyond a certain level is regulated by the head 4a of the rod 4 coming into contact with the upper end surface of the guide tube 3.

Lower base 1 and upper base 2 each have lower mold 1.
1 and a main bending blade 12 are attached facing each other. The lower die 11 has positioning members 11a, 11
b, etc., to position and support the plate materials to be joined.

Further, between the lower mold 11 and the main bending blade 12, a preliminary bending blade 13 is held, and the preliminary bending blade 13 is held to facilitate the movement of the lower base 1 and the upper base 2 toward and away from each other. A preliminary bending mechanism 17 is attached to the lower base 1 and includes a motion conversion mechanism that converts the movement towards and away from the main bending blade 12 into a preliminary bending movement of the preliminary bending blade 13. This will be explained in detail later.

The hemming mold 20 equipped with the above components includes a hanging bracket 14 fixed to the upper surface of the upper base 2.
The lower base 1 is raised linearly by a movable member that is suspended from the frame of the hemming device main body and raised and lowered by a pressurizing device such as a jacking device (not shown) disposed below the hemming device. At this time, a pressure block (not shown) as a fixing member fixed to the frame comes into contact with a pressure receiving block 15 fixed to the upper surface of the upper base 2 to prevent further rise, and the lower die 11 and the main bending blade 12 so that pressure can be applied between them.

Next, based on FIGS. 2 to 5, the preliminary bending mechanism 1 is
7 will be explained in detail.

In the figure, reference numeral 21 denotes a first horizontal shaft, which is rotatably supported by two brackets 22 and 23 fixed to the lower mold 11 at a constant interval. Second and third horizontal shafts 24 and 25 are supported by the bracket 22 and are disposed diagonally above and diagonally below one end of the horizontal shaft 21 (the left end in FIG. 3), respectively. Gears 26, 27, and 28 are attached to the center of each of these horizontal shafts (left end in FIG. 3), so that the rotation of the first horizontal shaft 21 is transferred to the second and third horizontal shafts 2.
4, 25.

Gear 2 of second and third horizontal shafts 24, 25
Circular protrusions 31 and 32 are located at the ends opposite to those to which the shafts 7 and 28 are attached, and the axes of the protrusions 31 and 32 are attached to the shafts 24 and 28, respectively.
25 (see FIG. 2). A bracket 36 is provided with mounting holes 33 and 34 drilled in both protrusions 31 and 32 at the same spacing, and a notch 35 formed in the center to allow the passage of the first horizontal shaft 21. are attached by attachment members 37 and 38.
As shown in FIG. 2, the preliminary bending blade 13 is fixed to the upper surface of the bracket 36 via a mounting member 39.

As shown in FIG. 3, the end of the first horizontal shaft 21 opposite to where the gear 26 is attached (the third
A cylindrical body 41 is fixed to the right end (in the figure), and an arm portion 4 fixed to the end surface of this cylindrical body.
A roller 43 is pivotally attached to 2.

Further, as shown in FIGS. 3 and 4, a pin 4 is inserted between a pair of plate-shaped bodies 44 and 45 that are attached to the frame 40 of the hemming device at a constant interval.
6 is fixed at each end to the plate-like bodies 44, 45 so as to be non-rotatable, and furthermore, a ratchet 4 is provided.
7 is rotatably provided around this pin 46. The ratchet 47 is connected to the pin 46 in FIG.
The part on the right side is made heavier and biased to rotate clockwise, and the stopper 48
Although it cannot rotate clockwise from a horizontal state, it can rotate counterclockwise due to the effect of There is.

Furthermore, as shown in FIGS. 2 and 3, an arm 51 is attached to the intermediate portion of the first horizontal shaft 21, and this shaft 21 has both ends of a pin 52, one end of which passes through the arm 51. It is urged to rotate counterclockwise in FIG. 2 by the elastic force of a tension spring 53 that is engaged with the section.

Next, the operation of this embodiment will be explained.

The positions of each component of the preliminary bending mechanism 17 shown in FIGS. 2 to 5 are those when the lower die 11, that is, the lower base 1, is in the lowered position in FIG. 1, and this is the position shown in FIG. 6. is indicated by a solid line.

In this state, as shown in FIG. 2, the inner plate 56 is superimposed on the outer plate 55 whose edges are bent at right angles to form a joint 55a, and the above-mentioned jacking device is driven by the drive device. Operate to raise the lower base (see Figure 1).

As lower base 1 rises, bracket 2
2 and 23 (23 is not shown in FIG. 2), the first horizontal shaft 21 fixed to the lower base 1 is raised. Due to this rise, the roller 43 is brought into contact with the ratchet 47 from below, so that
The arm 51 and the roller 43 are moved along the first horizontal axis 21 against the elastic force of the tension spring 53 at 5 in FIG.
It is rotated clockwise until it reaches the position shown at 1', 43'. When the first horizontal shaft 21 is rotated in this direction, the second and third horizontal shafts 2
4 and 25 are both rotated counterclockwise. Here, since there is a difference in pitch circle diameter between the gear 26 and the gears 27 and 28, the gear 26
Gears 26 and 27 rotate by approximately 1/3 rotation.
is rotated half a turn.

When both horizontal shafts 24, 25 are rotated,
The protrusions 31 and 32 are moved in circular orbits (upper semicircles) with their eccentricities as radii to positions 31' and 32', respectively, where a kind of four-link movement is performed. As a result, both protrusions 31, 3
Via the bracket 36 and attachment member 39 attached to 2, the pre-bending blade 13 is also moved along a similar trajectory to the position indicated at 13'. That is, the preliminary bending blade 13 is moved in a substantially horizontal direction during the movement, and the outer panel 5
As it approaches the joint portion 55a of No. 5, it approaches the lower mold 11 while being moved substantially vertically downward. As a result, the joint portion 55a is inclined by approximately 45°.

After the preliminary bending is completed, the lower base 1 (see FIG. 1) is raised continuously, and the roller 43 is moved to the ratchet 4 as shown at 47' in FIG.
7, the first horizontal shaft 21 is rotated by the action of the tension spring 53 in the opposite direction as described above, ie counterclockwise in FIG. This rotation causes the second and third horizontal shafts 24,
25, protrusions 31, 32, bracket 36, etc. are returned to their original positions by tracing trajectories opposite to those described above, and as a result, the preliminary bending blade 13 is returned to its original position. At this time, roller 4
3 is also returned to its original position.

Thereafter, when the lower base 1 is further raised and the lower mold 11 is brought closer to the main bending blade 12, the main bending blade 12 forms a joint which has been tilted at an angle of about 45 degrees by the preliminary bending blade 13. 55a and bend it onto the inner plate 56. At this time, the pressure receiving block 14 and the upper base 2 (see Fig. 1)
Through this, a strong pressing force is applied between the lower die 11 and the main bending blade 12.

When the main bending is completed, the lower base 1 is lowered. During this downward movement, the roller 43 of the first horizontal shaft 21 is in a position to engage with the ratchet 47, but the ratchet 47 rotates counterclockwise from the horizontal state as shown by the chain double-dashed line in FIG. to allow the roller 43 to pass. Further, the lowering of the lower base 1 is regulated by the head 4a of the rod 4 coming into contact with the upper end surface of the guide tube 3 in FIG.
In this way, all the components of the hemming die 20 are returned to their original positions.

Another embodiment of the present invention will be described below. Note that each embodiment mainly focuses on the preliminary bending mechanism (see Figure 1).
The description of parts that are different from the above example and that overlap with the above example will be omitted.

A second embodiment is shown in FIGS. 7 to 10.

In the figure, 101L and 101R are brackets fixed to the lower base (see FIG. 1).
Each bracket has links 103L and 10 of the same shape.
4L and links 103R, 104R connect one end to pins 105L, 106L and pins 105R, 106R.
The links 103L, 104L and the link 10
3R, the other end of 104R (links 103L, 104
(Only L is shown) is pivotally connected to other brackets 109L, 109R by pins 107L, 108L to form a four-link mechanism 110L, 110R. Each pin 105L, 106L, 107L, 10
Since the brackets 8L are each located at the apex of a parallelogram, the bracket 109L always moves while maintaining an upright position. Note that this also applies to the bracket 109R.

Link 103L, 103R and link 104
A cylindrical member 111,
112. Further, a preliminary bending blade attachment member 113 is attached to the free ends of the brackets 109L, 109R, and a preliminary bending blade 114 is fixed to this attachment member 113. Further, a roller 115 is pivotally attached to the center of the preliminary bending blade attachment member 113, and a cam bracket 1 having a cam groove 116 with which this roller 115 is brought into contact is attached from the upper base (see FIG. 1).
17 is hanging down. Cam bracket 11
The cam groove 116 of No. 6 is shaped so that when the upper base and the lower base are brought close to each other, the roller 115 is moved toward the center of the hemming die (leftward in FIG. 7) and then returned to its original position. It is said that In addition, links 104L and 104R are tension springs 1
The roller 115 is biased by 21L and 121R so as to be brought into positive contact with one surface of the cam groove 116.

When bending, from the state shown in Figure 11,
Brackets 101L, 10 fixed to the lower base
1R is raised, and the roller 115 moves into the cam groove 11.
The mounting member 11 is guided by the lower half of 6.
3 is moved to the left (in Figure 7).
As a result, the brackets 109L and 109R are kept upright by the link mechanisms 110L and 110R, and are moved diagonally downward to the left (the first
In the case of 109L in Fig. 1), the preliminary bending blade 114 fixed to the mounting member 113 is also moved along the same trajectory toward the lower die 125 to perform the preliminary bending described above. Figure 7 shows this situation).

The final bending is performed by the final bending blade 130 as the lower base continues to rise.
At this time, the roller 115 is engaged with the upper half of the cam groove 116, and the preliminary bending blade 114
To move in the opposite direction to that mentioned above,
The preliminary bending blade 114 does not interfere with the main bending blade 130. This embodiment is characterized in that the pre-bending blade 114 is moved in an oblique direction while drawing an arc close to a straight line due to a relatively large radius of curvature.

Still another embodiment of the present invention will be described with reference to FIG. 12.

In the figure, 131 is a lower base, and a lower mold 132 is fixed to the upper surface of this lower base, and a bracket 133 is erected. A cam bracket 135 in which a V-shaped cam groove 134 with a shallow angle is formed is rotatably provided on the bracket 133 around a shaft 136. The cam bracket 135 also has a preliminary bending blade 1 on its inclined surface.
37 is fixed.

On the other hand, a bracket 140 having a roller 139 pivotally attached to its lower end and a main bending blade 141 are fixed to the lower surface of the upper base 138, which is lowered by a pressure device (not shown).

During the hemming process, as the upper base 138 is lowered and the roller 139 is engaged with the first inclined portion 134a of the cam groove 134, the cam bracket 135 is rotated counterclockwise around the shaft 136. The preliminary bending blade 137 approaches the lower die 132 while drawing an arc having a radius of curvature with the axis 136 as the center of rotation. and roller 139
When the lower mold 132 is engaged with the valley 134c of the cam groove 134, as shown at 137' in the figure, the lower mold 132
The material is pressed against the surface of the material and pre-bending is performed. At this time, the main bending blade is at the position shown at 141'.

When the upper base 138 continues to descend, the roller 139 moves to the second inclined portion 134b of the cam groove 134.
, so that the cam bracket 135 is rotated clockwise about the shaft 136.
As a result, the preliminary bending blade 137 is separated from the lower die 132 along a trajectory opposite to that described above, and is returned to its original position by the roller 139 being engaged with the vertical portion 134d of the cam groove 134. I am made to do so. The final bending is then performed by the final bending blade 141'' by further lowering the upper base 138.

Next, another embodiment of the present invention will be described with reference to FIGS. 13 to 16.

In FIGS. 13 and 14, 161 is a lower base provided in a fixed position, and 162 is an upper base that is raised and lowered by a pressure device (not shown).

A lower mold 143 is fixed to the lower base 161, and two support stands (only one shown) 144 are fixed at a constant interval, and a cylindrical guide 145 is attached to the support stands. There is.

On the other hand, a main bending blade 146 is fixed to the upper base 162, and a cam bracket 148 having a cam plate 147 attached to an intermediate portion thereof is suspended. The cam plate 147 has a relatively steep first cam surface 147a and a gentler second cam surface 147b, and has a first and second flat cam surface 148 of the cam bracket 148.
A cam surface is formed together with a and 148b.

A preliminary bending blade 151 is provided between the lower die 143 and the main bending blade 146. This preliminary bending blade 151 has a flat shape as shown in FIG. 15, and has rods 152 erected at both ends thereof.
is inserted through the guide 145, and a roller 153 pivotally mounted at the center is brought into contact with the cam surfaces of the cam plate 147 and the cam bracket 148, thereby being moved in an oblique direction. .

The roller 153 is pivotally connected to the other end of a rotating member 157, which has one end pivotally connected by a pin 156 between a pair of mounting blocks 155 fixed to the center of the preliminary bending blade 151. The rotating member 157 cannot rotate counterclockwise in FIG. 13 from the state in which one end surface 157a is in contact with the rear end surface of the preliminary bending blade 151, but can now rotate clockwise. ing.

On the other hand, the rod 152 is erected on mounting blocks 158 fixed to both ends of the preliminary bending blade 151, and this mounting block 158 and the guide 14
A tension spring 159 is disposed between the roller 153 and the roller 153 to actively bring the roller 153 into contact with the cam surface.

Further, a stroke ball bearing 160 is interposed between the rod 152 and the rod guide 145, contributing to smooth sliding of the rod 152.

When the upper base 162 is at the rising end prior to hemming, the roller 153 is moved to the cam bracket 14.
8 (indicated by the two-dot chain line in FIG. 13). After that, the upper base 162 is lowered and the roller 153 is moved to the cam surface 1.
47a, the preliminary bending blade 151 moves the rod 152 diagonally downward to the right while being guided by the rod guide 145, approaches the lower die 143, and performs preliminary bending, as shown in FIG.

When the upper base 162 further descends, the roller 1
53 engages with the cam surface 147b, the preliminary bending blade 151 is returned to its original position by the action of the tension spring 159. At the same time, the final bending blade 146 moves downward and approaches the lower die 143 to perform final bending. (Figure 13 shows this state). Note that when the roller 153 engages with the cam surfaces 147a and 147b when the upper base 162 is raised, the rotating member 157 rotates clockwise around the pin 156 to avoid movement of the preliminary bending blade 151.

A major feature of this embodiment is that the preliminary bending blade 151 moves linearly in an oblique direction, and the main bending blade 146 moves linearly in a vertically downward direction.

In all of the above embodiments, the main bending blade moves perpendicularly to the lower die to perform the main bending, but if the main bending blade does not move in the inclined or horizontal direction, the main bending cannot be performed. The apparatus shown in FIGS. 17 to 20 may be used for hemming the parts that cannot be obtained.

In the figure, an L-shaped pre-bending bracket 17 is attached to a bracket 172 fixed to a lower base 171 that is raised and lowered by a pressure device (not shown).
3 is pivotally connected at its intermediate portion by a shaft 174. A pre-bending blade 175 is attached to one end of this pre-bending bracket 173, and a roller 176 is pivotally attached to the other end. Further, the upper end of the bracket 172 has a main bending blade 1 at one end.
The other end of an arm-shaped bracket 178 to which the bracket 77 is fixed is pivotally connected by a shaft 179.

On the other hand, a bracket 182 attached to the upper base 181 is formed with a cam groove 183 with which the roller 176 comes into contact, and is also provided with an L-shaped hanging part 184. A roller 185 is pivotally mounted to abut against the lower surface of the pre-bending bracket 173.
Also, the pre-bending bracket 173 and the bracket 17
2, there is a tension spring 186 which acts to bring the roller 176 into positive contact with one surface of the cam groove 183.
is installed. Furthermore, the upper base 181 has an L
A shaped bracket 187 is fixed and engaged with a pin 188 attached to the middle portion of the bracket 187 which holds the main bending blade 177. As shown in FIG. 20, the pin 188 is provided protruding from one end of a shaft 192 for rotatably attaching the pressure receiving block 191 to the bracket 187.

When the lower base 171 is in the lowered position prior to the hemming process, the bracket 173 equipped with the preliminary bending blade 175 is moved by the roller 18 as shown in FIG.
The bracket 178 provided with the main bending blade 177 is also in the most counterclockwise state as it is pushed up by the main bending blade 177. Thereafter, as the lower base 171 is raised, the bracket 173 is rotated clockwise by the action of the tension spring (see FIG. 17), and then the roller 176 is forced into the first inclined portion 183a of the cam groove 183. By contacting the two ends, the pre-bending blade 175 starts pre-bending. The preliminary bending roller 176 is connected to the cam groove 18
The process is completed when it comes into contact with the inlet portion 183b of No. 3. At this time, the bracket 178 is rotated clockwise while the pin 188 slides on the bracket 187 (FIG. 17 shows this state).

The main bending is performed on the lower base 17 as shown in FIG.
1 further rises and pin 188 connects to bracket 187.
As the upper base 181 is slid, the bracket 178 is further rotated clockwise, and the upper base 181
This is performed by the main bending blade 177 by pressing the pressure receiving block 191. At this time, the bracket 173 rotates counterclockwise as the roller 176 comes into contact with the second inclined surface 183c of the cam groove 183, and the preliminary bending blade 175 and the main bending blade 1
77 is avoided.

In this embodiment, in addition to the movable book bending blade 177, a fixed book bending blade fixed to the upper base 181 is provided.
This was done for the direct purpose of using both the main bending blades in combination, but even if only the movable main bending blade 177 is provided as described above, it is possible to move the main bending blade in the vertical direction. Of course, when processing a workpiece having a shape unsuitable for hemming, it is of course possible to use the apparatus of this embodiment alone.

In the above embodiments, both the upper base and the lower base were fixed, or the lower base was fixed but the upper base was suspended; however, in the latter case, the lower base and the upper It is also possible to provide an elastic means such as a spring on the support between the base and the base so that the elastic force of the spring causes the bases to move away from each other.

[Brief explanation of the drawing]

Figure 1 is a front view showing one embodiment of the present invention, Figure 2 is a front view showing one embodiment of the present invention;
The figure is an enlarged view of part A in Figure 1, Figure 3 is a right side view (partially cut away) of Figure 2, Figure 4 is a sectional view of Figure 3, and Figure 5 is a perspective view of Figure 4. , FIG. 6 is an explanatory diagram for explaining the operation of the embodiment shown in FIGS. 1 to 5. FIG. 7 is a front view (partially cut away) of main parts showing another embodiment of the present invention, FIG. 8 is a right side view, FIG. 9 is a cross-sectional view of FIG. 7, and FIG. The X view in the figure and FIG. 11 are explanatory diagrams for explaining the operation of the embodiment shown in FIGS. 7 to 10.
FIG. 12 is a front view showing still another embodiment of the present invention. FIG. 13 and FIG. 14 are front views of essential parts showing still another embodiment of the present invention, FIG. 15 is a front view of the pre-bending blade in both figures, and FIG. 16 is a front view of the preliminary bending blade in both figures. FIG. 3 is a front view for explaining the operation of the illustrated embodiment. FIG. 17 is a front view showing still another embodiment of the present invention, FIG. 18 is a right side view (partially cut away), FIG. 19 is a perspective view in FIG. 17, and FIG. 20 is a perspective view, 21st
22 are front views for explaining the operation of the embodiment shown in FIGS. 17 to 20, respectively. 1: Lower base, 2: Upper base, 3: Guide tube,
4: Rod, 11: Lower mold, 14: Hanging bracket, 15: Pressure receiving block, 20: Hemming mold, 1
3,114,137,151,175: Preliminary bending blade, 12,130,141,146,177: Main bending blade.

Claims (1)

[Claims] 1. A hemming device that joins both plates by bending the joining part where the edge of a first plate is bent at right angles onto the edge of a second plate overlaid on the first plate. The hemming device main body is separated into a main body and a hemming mold that is detachable from the main body, and the hemming device main body is separated into (a) a frame, (b) a fixing member fixed to the frame, and (c) a hemming mold that is detachable from the hemming device body. (d) a pressurizing device provided on the frame to drive the movable member; and (e) the hemming molds facing each other. The hemming device is arranged so that it can be relatively approached and separated by a plurality of guide posts, and is also arranged between a fixed member and a movable member of the hemming device, and is brought closer to each other when the two members approach each other. an upper base and a lower base; (f) a lower die attached to the lower base to position and support the superposed first and second plate materials; and (g) by approaching the lower die. (h) a pre-bending blade that performs a pre-bending motion to retract after inclining the joint portion bent at a right angle to form an acute angle with the edge of the second plate; a motion conversion mechanism that holds a preliminary bending blade and converts the approaching/separating movement of the upper base and the lower base into the preliminary bending motion in cooperation with a member provided on the frame or the upper base; ) A main bending blade attached to the upper base and working with the lower die to bend the inclined joint onto the edge of the second plate material after the preliminary bending blade is retracted. A hemming device characterized by: