JPH0847726A - Biaxial cross type rotary cam - Google Patents

Abstract

PURPOSE:To obtain a biaxial cross type rotary cam which can keep surely the strength of the top end part of the rotary cam while preventing the interference of the top end parts of the rotary cam to be abutted on each other. CONSTITUTION:In this biaxial cross type rotary cam, the abutting plane 13 of the other side rotary cam 11 is made in a plane like crossing by a right angle against the center line CL2, the abutting plate 12 of one side rotary cam 10 is made in a plane like abutting closely to the abutting plane 13, and a moving mechanism 42 consisting of a screw part 40 and a nut 41 is installed on the other side rotary cam 11. Therefore, when the rotary cam 11 is rotated in the R2 direction, the rotary cam 11 is moved in the arrow mark C direction by the moving mechanism 42, the anxiety of generating the interference on both rotary cams 10, 11 is eliminated, an outer plate of door 30 is let out easily. Because both abutting planes 12, 13 are the plane like, the strength of the rotary cams 10, 11 can be secured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-axis cross type rotary cam for bending a corner of a sheet metal work having a three-dimensional curved surface such as a vehicle body panel of an automobile, and a rotary cam technique which does not particularly apply an excessive force. Regarding

[0002]

2. Description of the Related Art Bending using a rotary cam is performed by bending a groove 51 of a rotary cam 50 into a sheet metal 6 as shown in FIG.
The one end 61 of 0 is pushed in the direction of the arrow Y by the pressing die 52, and the sheet metal 60 is wound around the outer peripheral surface of the rotary cam 50 supported by the housing 62. After such bending, as shown in FIG. 4 which is a view taken in the direction of arrow J of FIG.
The sheet metal work 60 is pulled out in the direction of arrow K while rotating in
Disengage from. As an example of applying the bending process using such a rotary cam, as shown in FIG. 5, a curved portion A of an automobile panel 63 having a three-dimensional curved surface such as a door outer plate of an automobile or a quarter panel on the rear side of the vehicle body, There is a B corner. To bend the curved parts A and B,
As shown in FIG. 7, the curved surfaces 64 (FIG. 7) of the curved portions A and B are bent by abutting the tips of the two rotary cams 50 and 52. At this time, in order to separate the sheet metal work from the rotary cams 50 and 52, as in the case of FIG.
It must be rotated in the R2 direction. However, when the abutting surfaces A1 and A2 of the connected rotary cams 50 and 52 are flat, when the rotary cams 50 and 52 are respectively rotated in the directions of the arrows R1 and R2, interference occurs at each tip. However, the tips will collide. Therefore, Fig. 7
As shown in FIG. 8, a recess 58 is formed in a portion where the tip portion 56 of each rotary cam 52 collides, and each rotary cam 50, 52 is moved to the position shown in FIG.
Interference does not occur even when rotated in two directions. In such rotary cams 50 and 52, as shown in FIG. 8, first, one of the rotary cams 50 and 52 is rotated in the direction of arrow R1 and then the other rotary cam 52 is pushed to the limit where interference does not occur at the tips of both rotary cams 50 and 52.
Is rotated in the direction of arrow R2, and then the processed automobile panel 63 is separated from both rotary cams 50 and 52.

[0003]

However, when the recess 58 is formed in the tip portion 56 of the rotary cam 52, the tip portion 56 becomes thin and a large pressure contact force is applied to the tip portion 56 of each rotary cam 52 during bending of the sheet metal. Has a problem that the strength of the tip portion 56 is insufficient. In order to solve the problems in the conventional art, the present invention provides a two-axis cross type rotary cam capable of ensuring the strength of the rotary cam tips while preventing interference between the rotary cam tips that abut each other. It is intended to be provided.

[0004]

In order to achieve the above object, the present invention is directed to a case where two rod-shaped rotary cams, which are arranged so as to intersect each other with their axial center lines intersecting each other, are provided at the corners of the sheet metal work. While abutting against each other, the sheet metal work is pressed on both rotary cams so as to be wound around the outer peripheral surfaces of both rotary cams, and the corners are bent into a three-dimensional curved surface. After the bending, both rotary cams are unwound from the winding of the sheet metal work. Rotate to retract from sheet metal work 2
In the axial cross type rotary cam, one rotary cam having a flat first abutting surface set at a right angle with respect to the center line of the other rotary cam, and the first abutment A second rotary cam having a second abutting surface formed in a flat shape so as to abut against the surface, and the other rotary cam moved so as to move away from or approach the first abutting surface. A two-axis-intersecting type rotary cam characterized by comprising a moving mechanism for moving the same.

[0005]

According to the present invention, when the sheet metal work is bent, the other rotary cam is made to approach the one rotary cam by the moving mechanism while rotating the other rotary cam.
The two abutment surfaces of one rotary cam are brought into close contact with the first abutment surface of the other rotary cam, and the two rotary cams are connected to each other as shown in FIG.
Connect as in (a). After bending, the other rotary cam is moved by the moving mechanism so as to move away from the one rotary cam while rotating the other rotary cam (FIG. 1 (b)), and the second abutting surface is moved to the first abutting surface. To prevent interference between both rotary cams. After that,
One of the rotary cams is rotated (FIG. 1C) to retract both rotary cams from the worked sheet metal work.

[0006]

Embodiments of the present invention will be described below with reference to the accompanying drawings for the understanding of the present invention. The following embodiments are examples of embodying the present invention and are not intended to limit the technical scope of the present invention. 1 is a plan view showing a two-axis crossing type rotary cam according to one embodiment of the present invention, and FIG. 2 is a perspective view of the rotary cam. As shown in FIG. 1A, a pair of two rotary cams 10 and 11 are abutted against each other so as to intersect axial centerlines CL1 and CL2 with each other. The abutting surface 13 (second abutting surface) of the rotary cam 11 is formed in a plane shape orthogonal to the center line CL2, and the abutting surface 12 (first abutting surface) of the rotary cam 10 is the abutting surface. It is formed in a flat shape that is in close contact with the mating surface 13. Such abutting surfaces 12, 13
The outer peripheral surface of the rotary cam 10 forms the inner curved surface 31 of the corner portion of the door outer plate 30 (sheet metal work) of the automobile, for example. Both rotary cams 10, 11 have
Grooves 20 and 21 into which a pressing die (not shown) is pushed are formed. One end of the door outer plate 30 is pushed into the grooves 20 and 21 by the pushing die and the doors are attached to the outer peripheral surfaces of the rotary cams 10 and 11. By winding the outer plate 30, the corner portion of the door outer plate 30 is bent along the curved surface 31. As shown in FIG. 2, a screw portion 40 is concentrically connected to the base end portion of the rotary cam 11, and the screw portion 40 is screwed into a fixed nut 41. Screw part 4 to nut 41
When the rotary cam 11 is screwed with 0, the center line CL2
When the rotary cam 11 is rotated around, the rotary cam 11 moves in the axial direction.
A moving mechanism 42 configured to move the rotary cam 11 is configured.

In the configuration of the above-described embodiment, the door outer plate 3
After the bending process of 0 is completed, as shown in FIG. 1B, when the rotary cam 11 is rotated in the direction of arrow R2,
The moving mechanism 42 moves the rotary cam 11 in the direction of arrow C, the abutting surface 13 of the rotary cam 11 moves away from the abutting surface 12 of the rotary cam 10, and both rotary cams 1
It is possible to remove the door outer plate 30 from the rotary cam 11 as well as to prevent the interference between 0 and 11. In this state, the rotary cam 10 is rotated in the R1 direction as shown in FIG.
1 is retracted from the door skin 30. In the above embodiment, the abutting surfaces 12, 13 of both rotary cams 10, 11 are joined.
Is formed in a plane, the rotary cam 10,
Since it is not necessary to thin the tip of the door 11 by thinning it, it is possible to secure the strength to withstand the bending force of the door outer plate 30. Further, after the door outer plate 30 is bent by the rotary cams 10 and 11, by moving the rotary cam 11 in the direction of the arrow C, there is no risk of the rotary cams 10 and 11 interfering with each other, and the rotary cams 10 and 11 can be easily moved. Can be retracted from the door outer plate 30, and the number of steps required for bending the door outer plate 30 can be reduced. In addition,
The present invention is not limited to the above embodiment and can be variously modified. In the above embodiment, the moving mechanism 42 is constituted by the screw portion 40 and the nut 41, but a ball screw mechanism or another mechanism such as a worm mechanism capable of moving the rotary cam 11 in the axial direction can be adopted.

[0008]

Since the two-axis cross type rotary cam according to the present invention is constructed as described above, it is not necessary to make the tip portions of the two pairs of rotary cams, which abut against each other, thin, and the sheet metal workpiece It is possible to secure the strength to withstand bending.

[Brief description of drawings]

FIG. 1A is a plan view of a coupled state of a two-axis crossing type rotary cam according to an embodiment of the present invention, FIG. 1B is a plan view showing a state in which the other rotary cam is moved, and FIG. FIG. 6 is a plan view showing a state in which the rotary cam of FIG.

FIG. 2 is a perspective view of the other rotary cam.

FIG. 3 is a perspective view showing bending processing by a rotary cam.

FIG. 4 is a view on arrow J of FIG.

FIG. 5 is a plan view showing a corner portion of an automobile panel.

FIG. 6 is a plan view showing a rotary cam having a flat abutting surface.

FIG. 7 is a plan view showing a state in which a conventional rotary cam having a tip formed with a recess is abutted.

FIG. 8 is a plan view showing a state in which a conventional rotary cam having a recess formed at its tip is rotated to separate a sheet metal work.

[Explanation of symbols]

 10, 11 ... Rotary cam 12, 13 ... First and second abutment surfaces 30 ... Door outer plate (sheet metal work) 40 ... Screw part 41 ... Nut 42 ... Moving mechanism

Claims (1)

[Claims] 1. The ends of two rod-shaped rotary cams, which are arranged so as to intersect each other in the axial centerlines, abut at the corners of the sheet metal works, and the sheet metal works are wound around the outer peripheral surfaces of both rotary cams. In such a two-axis cross type rotary cam that presses against both rotary cams to bend the corners into a three-dimensional curved surface, and after bending, rotate both rotary cams in the direction unwinding from winding the sheet metal work to retract from the sheet metal work. A flat first abutment surface set to be orthogonal to the center line of the other rotary cam is abutted on the first abutment surface with one rotary cam formed at the tip end. Second rotary cam having a flat second abutting surface formed at the tip end thereof, and moving the other rotary cam away from or closer to the first abutting surface And a moving mechanism for moving the two-axis crossing type rotary cam.