JPH0155054B2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field"
The present invention relates to a hemming device that can handle a plurality of workpieces that differ only in part of the hemming process.

``Conventional technology'' The edges of parts such as automobile doors and lids are hemmed. In this case, if the shape or size of the workpiece differs, a dedicated hemming machine must be used. The same applies to a plurality of workpieces that have the same shape and size for the most part, but differ only in a part of the hemming process.

"Problems to be Solved by the Invention" Providing multiple dedicated machines for multiple workpieces that differ only in some shapes and dimensions as described above requires a wide space for installation. However, there was a problem of high costs.

``Means for Solving the Problems'' The means constructed by the present invention to solve the above-mentioned problems has a plurality of receiving surfaces at different positions from the center of rotation, and is rotatable about a shaft provided in the horizontal direction. a lower die switching section that is supported and has a drive mechanism that provides rotational force and a positioning mechanism that maintains a stop position; a number of bending blades corresponding to the plurality of receiving surfaces of the lower die switching section; The present invention includes an upper die switching section that has a moving mechanism that moves the bending blade to the operating position and a drive mechanism that applies hemming force to the bending blade, and is supported so as to rotate in a horizontal plane.
The drive mechanism of the lower die switching section and the drive mechanism of the bending blade of the upper die switching section are made of hydraulic cylinders, the movement mechanism of the bending blade of the upper die switching section is made of an air cylinder, and the positioning mechanism of the lower die switching section is made of a hydraulic cylinder. The preferred embodiment is to use a wedge that partially sinks into the type switching part and a hydraulic cylinder that moves the wedge forward and backward.

"Operation" With this configuration, by rotating the lower mold switching part and the upper mold switching part in synchronization, stopping them, and then applying pressure, it is possible to rotate multiple objects with partially different shapes and dimensions. Hemming processing can be performed on the workpiece.

"Embodiment" Next, an embodiment of the present invention will be described with reference to the drawings. In FIG. 1, 1 is a hemming device,
This is an outline of the process. This hemming device 1
includes a base 2, a gate-shaped frame 3, a pillar 4 installed on the base 2, an elevating body 5 that moves up and down along the pillar 4, and a drive source that drives the elevating body 5 up and down. 6, a lower mold 7, and an upper mold 8, which will be described next.

Reference numeral 9 denotes a workpiece, for example, a back door of an automobile as shown in FIG. When a back door is the workpiece, depending on the model of the car, there is a standard length one shown by the solid line, and a longer workpiece that has the same shape for the most part but differs only in some dimensions as shown by the chain line. There is object 9'.

The lower mold 7 has a lower mold switching section 7a as shown in FIG.
and a lower mold common part 7b, and the lower mold switching part 7
The lower die common portion 7b is designed to perform hemming on portions having different shapes and dimensions, and the lower die common portion 7b hems portions of the same shape on the workpieces 9 and 9'.

FIG. 3 shows the lower die switching section 7a and the hydraulic cylinder 10, which is a drive device that applies rotational force to the lower die switching section 7a. Lower mold switching section 7a
is rotatably supported by a bearing (not shown) on a shaft 11 provided in the horizontal direction, and has a plurality of receiving surfaces 12 and 13 at different positions from the shaft 11, which is the center of rotation. . As will be described later, the workpiece 9 is placed on this lower mold 7 from the left side of the figure, so the receiving surface 12 located away from the shaft 11 corresponds to the workpiece 9 with a short overall length, and is close to the shaft 11. The receiving surface 13 in position will correspond to the longer workpiece 9'. The number of receiving surfaces can also be two or more.

A base of an arm 14 is attached to the shaft 11. A bracket 16 attached to the tip of a rod 15 protruding from the hydraulic cylinder 10 is connected to the tip of the arm 14 by a shaft 17. The hydraulic cylinder 10 is supported on the base 2 by a bracket 18. This structure allows
When the hydraulic cylinder 10 operates and the rod 15 moves forward or backward, the lower die switching section 7a rotates. This rotation is performed in order to bring the receiving surface 12 or 13 into a position corresponding to the descending upper die, and therefore a stroke corresponding to the number of receiving surfaces is required.

FIG. 4 shows a wedge 19, which is a positioning mechanism that holds the lower die switching section 7a at a stop position, and a hydraulic cylinder 20 that drives this wedge 19. This positioning mechanism is provided on the opposite side of the hydraulic cylinder 10 shown in FIG. The hydraulic cylinder 20 is fixed to the base 2 by a bracket 21, and a wedge 19 is attached to the tip of a rod 22 protruding from the hydraulic cylinder 20. The wedge 19 is connected to the lower die switching section 7a via a positioning block 23 having a shape adapted to the lower die switching section 7a.
will be pressed. When the lower die switching section 7a rotates, the rod 22 is retracted so that the positioning block 23 and the wedge 19 are separated from the lower die switching section 7a.

The upper mold 8 has an upper mold switching section 8a as shown in FIG.
and an upper mold common part 8b, and an upper mold switching part 8.
The upper die common portion 8b is designed to perform hemming on portions having different shapes and dimensions, and the upper die common portion 8b hems portions of the same shape on the workpieces 9 and 9'.

FIG. 5 shows a turntable 24, which is a part of the upper die switching section 8a, and a hydraulic cylinder 2, which is its driving mechanism.
5 is a plan view of FIG. A plurality of bending blades are attached to the turntable 24 below the surface shown in the figure, as will be described later. The turntable 24 has a substantially semicircular shape and rotates around a shaft 26. The hydraulic cylinder 25 is attached to the elevating body 5 shown in FIG. 1, and a bracket 29 pivotally connected to the turntable 24 by a shaft 28 is attached to the tip of the rod 27 that protrudes when the hydraulic cylinder 25 is activated. It is being This allows the hydraulic cylinder 25 to rotate the turntable 24 by a predetermined angle (90 degrees in this embodiment).

Next, regarding FIGS. 6 and 7, the upper die switching section 8
Each part of a will be explained. During the hemming process, a reaction force of the hemming force is applied to the turntable 24, which is a part of the upper die switching section 8a. Therefore, a stopper mechanism is provided near the turntable 24. Figure 6 shows this.
The turntable 24 is supported by a support 31 on a bracket 30 that is integrated with the elevating body 5 so as to be rotatable but not swingable. In the vicinity of this turntable 24, a positioning block 34 whose upper part is pivotally connected to a bracket 32 on the side of the elevating body 5 by a shaft 33 is provided with its lower part facing the outer periphery of the turntable 24. There is. A part of the positioning block 34 is attached to a bracket 37 at the lower end of a rod 36 protruding from a hydraulic cylinder 35, and the shaft 3
They are joined by 8. With this structure, when the hydraulic cylinder 35 operates to press the positioning block 34 against the turntable 24, it can withstand the hemming force during pressurization.

FIG. 7 shows the main parts in FIG. 1 in an operating state. To explain this, turntable 2
4 are provided with brackets 39 and 40 at the same distance from the shaft 26, and the shorter workpiece 9 is attached to these brackets 39 and 40.
and a bending blade 41 corresponding to the longer workpiece 9'.
A corresponding bending blade 42 is pivotally connected by shafts 43 and 44. The illustrated bending blades 41 and 42 are for main bending. In addition to this, a preliminary bending blade is attached to the turntable 24 with a similar structure, but illustration thereof is omitted. Air cylinders 47 and 48 are attached to the turntable 24 by brackets 45 and 46. The rod 4 protrudes from the air cylinders 47 and 48.
The tips of 9, 50 are bent blades 41, 4 with shafts 51, 52.
It is pivoted to a part of 2.

As shown in FIG. 7, during pressurization, when the elevating body 5 descends and one bending blade 41 (the same applies to the bending blade 42 and the preliminary bending blade) comes near the lower die 7, the bending blade 41 A hydraulic cylinder 53 is mounted with a bracket 54 so as to face it. This hydraulic cylinder 53 is a drive mechanism that provides hemming force. Therefore, the rod 55 protruding from the hydraulic cylinder 53 faces the bending blade 41.

Next, the hemming process sequence during pressurization will be explained. First, as shown in FIG. 1, when the elevating body 5 is in the raised position, the lower die switching section 7a and the upper die switching section 8a are prepared according to the type of workpiece 9. This preparation is carried out by the lower die switching section 7a operating the hydraulic cylinder 10 (see FIG. 3) to rotate it around the shaft 11, and the upper die switching section 8a operating the hydraulic cylinder 25.
(See Figure 5) and turntable 24.
Do this by rotating. When the specified state is reached,
The lower die switching section 7a operates the hydraulic cylinder 20 (see FIG. 4) and uses the wedge 19 to move the positioning block 2.
3 is pressed and fixed, and the upper die switching section 8a operates the hydraulic cylinder 35 (see FIG. 6) to press and fix the positioning block 34 against the outer circumference of the turntable 24.

In this state, the processing part of the workpiece is placed on the lower die 7, and the driving source 6 (see FIG. 1) is activated to lower the elevating body 5 to the state shown in FIG. 7. Next, the hydraulic cylinder 53 is operated, and the rod 55 bends the bending blade 4.
Press 1 to perform the hemming process. The bending blade 42 is used in a similar hemming sequence for the longer workpiece 9'. Although preliminary bending is performed before the main bending, such hemming work itself is no different from conventional hemming work.

"Effects of the Invention" As explained above, in this invention, both the lower mold and the upper mold have switching parts that can be changed to a plurality of hemming forms according to the size of the workpiece 9. This has the effect of reducing installation space and cost, compared to conventional machines that require dedicated machines depending on the type of workpiece.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway front view of an embodiment of the present invention, FIG. 2 is a perspective view of an example of a workpiece, FIG. 3 is a front view of a lower mold drive mechanism, and FIG.
The figure is a front view showing the lower die positioning mechanism, Figure 5 is a plan view showing the turntable drive mechanism, Figure 6 is a front view showing the turntable stopper mechanism, and Figure 7 is an enlarged view of the main parts showing the operating state. It is a front view. 1... Hemming device, 7a... Lower die switching section, 8
a...Upper mold switching section, 10, 20, 25, 35, 5
3... Hydraulic cylinder, 12, 13... Receiving surface, 1
9...Wedge, 41,42...Bending blade, 47,4
8...Air cylinder.

Claims (1)

[Scope of Claims] 1. A drive mechanism that has a plurality of receiving surfaces at different positions from the center of rotation, is rotatably supported by a shaft provided in the horizontal direction, and provides rotational force, and a positioning mechanism that maintains a stop position. a lower die switching section having;
It has a number of bending blades corresponding to the plurality of receiving surfaces of the lower mold switching part, a moving mechanism for moving the bending blades to an operating position, and a drive mechanism that applies a hemming force to the bending blades, and rotates in a horizontal plane. A hemming device characterized by comprising: an upper mold switching section supported in such a manner that 2. Claims characterized in that the drive mechanism of the lower die switching section and the drive mechanism of the bending blade of the upper die switching section are hydraulic cylinders, and the moving mechanism of the bending blade of the upper die switching section is an air cylinder. The hemming device according to item 1. 3. The hemming device according to claim 1, wherein the positioning mechanism of the lower die switching section is a wedge that partially sinks into the lower die switching section and a hydraulic cylinder that moves the wedge forward and backward.