JP2573792Y2 - Hemming equipment - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hemming apparatus for performing hemming after preliminarily bending an end of a press work.

[0002]

2. Description of the Related Art As a conventional hemming apparatus for preliminarily bending an end portion of a press work and then hemming the end portion, there is known a hemming device shown in FIGS.
No. 7,380 has been proposed.

In this hemming apparatus, a press work w to be hemmed is placed on a predetermined position on a lower die 11 such that a bent portion a of the press work w is positioned on a preliminary bending die surface 11 a of the lower die 11. Then, when the upper die holder 12 is moved downward by the press device, the pad 13 comes into contact with the press work w on the lower die 11, and the press work w is held between the pad 13 and the lower die 11. Is done.

When the upper die holder 12 is further lowered, the pre-bending punch surface 14a of the pre-bending punch 14 comes into contact with the bent portion a of the punch work w as shown in FIG. With the bent portion a of the press work w sandwiched by the pre-bending die surface 11a of the lower die 11, the tip of the bent portion a is bent at a predetermined pre-bending angle.

When the upper holder 12 is further moved downward, a pressing member 15 attached to the upper holder 12 causes a rear end portion of a lever 16 to extend to a spring 22 having a rod portion 21a of a piston 21 applied thereto, as shown in FIG. By pressing the lever 16 in a counterclockwise direction in the figure by pressing with a pressing force greater than the urging force, the contact portion 16a of the lever 16 contacts the engaging portion 14b of the preliminary bending punch 14 and the preliminary bending punch 14 is raised against the urging force of the spring 17. Almost simultaneously with the rise of the preliminary bending punch 14,
The cam surface 18a of the cam driver 18 abuts against the cam surface 19a of the hemming cam 19 to advance the hemming cam 19 against the spring 20.
9, the hemming cam surface 19b abuts on the tip of the bent portion a of the pre-bent press work w, and the hemming cam surface 19a and the pre-bending die surface 11a of the lower die 11 form the bent portion a tip. Hemming processing is performed so that it is completely bent by sandwiching it.

[0006]

According to the above-mentioned conventional hemming apparatus, the upper die holder is moved down one time (one step).
As a result, the pre-bending process and the hemming process of the press work are continuously performed, so that an improvement in working efficiency can be expected, and the installation space of the apparatus can be reduced. However, since a lever, a piston, and the like for performing the pre-bending process and the hemming process continuously are provided, the structure of the device becomes complicated, and as a result, high-speed machining is difficult. It is difficult to ensure durability over a period of time, and there are problems such as a rise in equipment costs such as man-hours for manufacturing the apparatus and maintenance.

Accordingly, an object of the present invention is to provide a hemming apparatus capable of simplifying the structure, increasing the processing speed, securing processing accuracy and improving durability, and reducing the equipment cost. is there.

[0008]

According to the present invention, there is provided a hemming apparatus for performing a hemming process after preliminarily bending an end portion of a press work. A lower die pad is provided on the lower die shoe via an elastic member so as to be able to move up and down. A pre-bending cam provided on the lower die shoe that forms a cam surface and is movable in the horizontal direction so as to come into contact with and separate from the side surface of the lower die shoe, and biases the pre-bending cam in a direction approaching the side surface of the lower die shoe. An elastic member that cooperates with the upper surface of the lower mold pad in accordance with the downward movement to support the work support surface for holding the press work and the bent portion of the press work from above,
An upper die having a bent portion supporting surface for preliminarily bending the bent portion in cooperation with the cam surface; A cam driver for separating the bending cam from the side surface of the lower die pad, and a lower die shoe for hemming the pre-bent bent portion in cooperation with the bent portion supporting surface by the downward movement of the upper die. And a hemmed surface.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the hemming apparatus according to the present invention will be described below with reference to the drawings.

FIG. 1 is an explanatory cross-sectional view of a main part of a hemming apparatus according to the present embodiment. This hemming apparatus preliminarily bends an end of a press work w having a bent portion a at an end, and then performs hemming. Is performed in one continuous step.

In the figure, reference numeral 1 denotes a lower die shoe, and a lower die pad 2 having an upper surface 2a for superimposing a press work w to be subjected to hemming is mounted on the lower die shoe 1 by an elastic member such as a spring 4. The lower die pad 2 is configured to be able to move up and down by the side surface 2 b slidingly contacting the lower die insert 3 fixed to the lower shoe 1.

Further, on the upper surface of the lower die shoe 1, a pre-bending cam 6 urged by a resilient member, for example, a spring 5, in a direction in which the tip 6 b comes into contact with the side surface 2 b of the lower die pad 2, contacts the lower die pad 2. The pre-bending cam 6 has a cam surface 6a formed at the upper end of the pre-bending cam 6 so as to be capable of reciprocating in the horizontal direction.

On the other hand, the upper die 7, which moves up and down opposite to the lower shoe 1, cooperates with the upper surface 2a of the lower die pad 2 by the downward movement to hold and press and fix the press work w. In addition, a bent portion supporting surface 7b is formed to be in contact with and support the bent portion a projecting from the lower mold pad 2 of the press work w from above. Further, the upper die 7 faces the cam surface 6a of the pre-bending cam 6 and contacts the cam surface 6a as the lower die shoe 1 descends, and slides against the cam surface 6a to pre-bend against the spring 5. An inclined cam surface 8 for separating the cam 6 from the side surface 2b of the lower die pad 2.
A cam driver 8 having a is provided.

Next, the operation of the hemming apparatus configured as described above will be described with reference to FIGS.

First, a press work w to be subjected to hemming processing is placed on a predetermined position on the upper surface 2a of the lower die pad 2 so as to overlap.

Thereafter, the upper die 7 is pressed by a press machine.
As shown in FIG. 1, first, the work support surface 7a and the bent portion support surface 7b of the upper die 7 come into contact with the press work w, and the press work is performed by the pad 2 and the work support surface 7a. w, and supports the bent portion a from above.

Subsequently, when the upper die 7 is further lowered, the lower die pad 2 slides on the lower die insert 3 against the urging force of the spring 4 by the upper die 7 via the press work w. The tip of the bent portion a contacts the cam surface 6a of the pre-bending cam 6 while being guided down, and the cam surface 6a and the bent portion supporting surface 7b of the upper die 7 as shown in FIG.
As a result, preliminary bending is performed to bend the end of the bent portion a to a predetermined preliminary bending angle, for example, 45 °.

Subsequently, when the upper die 7 is moved downward, the cam driver 8 which is moved downward by the downward movement of the upper die 7 is moved.
The inclined cam surface 8a and the cam surface 6 of the pre-bending cam surface 6 are in contact with each other, and the pre-bending cam 6 is pushed against the urging of the spring 5 while being in sliding contact with the cam surface 6 from the side surface 2a of the lower die pad 2. Separate.

By lowering the upper die 7 further,
The tip of the bent portion a of the press work w supported from above by the bent portion support surface 7b abuts on the upper surface 3a of the lower die insert 3, which is the hemming surface of the lower die shoe 1, and the upper die 7 A hemming process is performed to completely bend the end of the bent portion a with the bent portion supporting surface 7b and the upper surface 3a of the lower die insert 3 as shown in FIG.

Thus, as described above, the pre-bending process and the hemming process of the press work w are performed in series by one downward movement (one step) of the upper die 7.

Further, after the pre-bending process is completed, the pre-bending cam 6 is retracted by directly contacting the pre-bending cam 6 with the upper die 7 by the cam driver 8 which moves downward before the hemming process. Simplification can be achieved, high-speed processing, high processing accuracy can be ensured, high durability can be obtained, and reduction in equipment costs can be expected.

In the above description, one cam surface of the pre-bending cam is configured to function as a pre-bending and sliding contact surface with the cam driver. It is also possible to form it with two independent cam surfaces, and it is also possible to appropriately change the structure of another elastic member such as polyurethane instead of the spring.

[0023]

According to the hemming device of the present invention, after the pre-bending process is completed, the pre-bending cam is retracted by the cam driver which moves down integrally with the upper die prior to the hemming process. In addition, the structure can be simplified, high speed processing, high processing accuracy and high durability can be achieved, and reduction in equipment cost can be expected.

[Brief description of the drawings]

FIG. 1 is an explanatory sectional view of a main part showing an embodiment of a hemming apparatus according to the present invention.

FIG. 2 is an explanatory cross-sectional view of a main part showing an operating state of the embodiment.

FIG. 3 is an explanatory cross-sectional view of a main part, similarly showing an operation state of the present embodiment.

FIG. 4 is an explanatory sectional view of a main part showing a conventional hemming apparatus.

FIG. 5 is an explanatory cross-sectional view of a main part showing an operating state of a conventional hemming apparatus.

[Explanation of symbols]

 Reference Signs List 1 lower die shoe 2 lower die pad 2a upper surface 2b side surface 3a hemming surface 4 spring (elastic member) 5 spring (elastic member) 6 pre-bending cam 6a cam surface 7 upper die 7a work support surface 7b bent portion support surface 8 Cam driver 8a Inclined cam surface

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Noboru Endo 1-7-2 Nishi-Shinjuku, Shinjuku-ku, Tokyo Inside Shimizu Tomi Kogyo Co., Ltd. (56) References Hikaru 3-91120 (JP, U) 1986-35307 (JP, Y2) (58) Fields investigated (Int. Cl. ⁶ , DB name) B21D 19/08

Claims (1)

(57) [Scope of request for utility model registration] In a hemming apparatus for performing hemming after preliminarily bending an end portion of a press work, a lower die shoe and a bent portion on the upper surface of which the press work is to be subjected to the hemming process are projected. A lower mold pad movably mounted on the lower shoe via an elastic member, and a cam surface for preliminary bending formed at an upper end of the lower shoe, and comes into contact with and separates from the side surface of the lower shoe. A pre-bending cam provided on the lower die shoe so as to be movable in the horizontal direction, an elastic member for urging the pre-bending cam in a direction approaching the side surface of the lower die shoe, and cooperating with the upper surface of the lower die pad according to the downward movement. A work support surface for holding the press work and a bent portion support surface for supporting the bent portion of the press work from above and for preliminarily bending the bent portion in cooperation with the cam surface. Upper die After the pre-bending, a cam driver that slides on the cam surface by the downward movement of the upper die to separate the preliminary bending cam from the side surface of the lower die pad, and cooperates with the bent portion support surface by the downward movement of the upper die. And a hemming surface provided on a lower die shoe for hemming the bent portion that has been preliminarily bent.