JPS637380Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a hemming device that performs hemming after pre-bending the end of a press work.

Conventionally, when hemming the end of a press work, the end of the press work is pre-bent in a separate work process, and then the hemming process is performed to completely bend the pre-bent end. I try to do this. As a result, two work steps, pre-bending and hemming, are required, resulting in poor work efficiency and the need for a large space for the installation of equipment.

Therefore, in order to solve such problems, 1.
A hemming device has been proposed in which preliminary bending and hemming can be performed simultaneously. In other words, the proposed hemming device includes a lower mold on which a press work is placed, an upper mold holder that is moved up and down by the press device in opposition to the lower mold, and a lower mold upper part on the lower surface of the upper mold holder. A hemming punch is attached to the end of the press work placed on the press workpiece, and has a hemming mold surface formed on the lower end thereof, and the hemming punch is supported by the upper mold holder so as to be movable back and forth at a position below the hemming punch, and the front end A pre-bending cam having a pre-bending cam surface formed on the part thereof, and a pre-bending cam provided outside the press work mounting position of the lower mold,
A driver cam is provided at the upper end thereof with an inclined cam surface that abuts the front end of the pre-bending cam and moves the pre-bending cam back after completion of the pre-bending, and the pre-bending is performed as the upper die holder moves downward. After pre-bending the end of the press work with a cam, the pre-bending cam is moved back by a driver cam, and instead of this, a hemming process is performed using a hemming punch to completely bend the pre-bent end. (Refer to Japanese Patent Application Laid-open No. 74325/1983).

However, in the above proposal, the pre-bending process of the end of the press work is performed by pressing the end of the press work only with the pre-bending cam, so it is not possible to freely form the shape of the pre-bending. There is a problem in that hemming cannot be performed on a press work whose portion is curved. In addition, the backward movement of the pre-bending cam after the pre-bending is completed is performed by contact between the pre-bending cam and a driver cam fixed to the lower die.
Since it takes a relatively long time to complete the backward movement, there is a problem in that it is difficult to set the timing to move from preliminary bending to the backward movement.

This invention was made in consideration of these points,
A pre-bending die surface is formed on the upper surface of the side of the lower die, and a pre-bending punch is provided on the upper die holder so as to be movable up and down, and the end of the press work is pre-bent by the above-mentioned preliminary die surface and the pre-bending punch. , the pre-bending punch is raised by a lever that swings up and down as the upper mold holder descends, and the pre-bending end is hemmed by a hemming cam instead;
Pre-bending and hemming can be performed simultaneously with one hemming device, improving work efficiency and reducing installation space. The purpose of this invention is to expand the scope of application and to easily set the transition timing from preliminary bending to backward motion.

In order to achieve this purpose, the present invention has a hemming device that performs hemming after pre-bending the end of the press work.
A lower die on which a press work is placed and a pre-bending die surface formed on the upper side surface, an upper die holder that is moved up and down by a press device in opposition to the lower die, and a lower die placed on the upper die holder. A pre-bending punch is supported so as to be movable up and down facing the surface of the pre-bending die and is always urged downward by an elastic member; a lever that is pressed by the upper mold holder and raises the pre-bending punch at its other end; and a hemming cam that is movable back and forth with respect to the lower mold and has a hemming cam surface formed at its front end. and,
A driver cam is attached to the lower surface of the upper mold holder and has a lower end formed with an inclined cam surface that touches the rear end of the hemming cam to advance the hemming cam after preliminary bending is completed, and the driver cam lowers the upper mold holder. As the movement progresses, the end of the press work is pre-bent using the pre-bending die surface of the lower mold and the pre-bending punch, and the pre-bent end is hemmed using a hemming cam to simultaneously perform both processes. This is done at the same time in the process.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the embodiments

FIG. 1 shows a hemming device A which is an embodiment of the present invention.
The hemming process is performed after the tip is pre-bent. The hemming device A has a lower die holder 1 on the lower side, and a lower die 2 is fixedly attached to the upper surface of the lower die holder 1, and the press workpiece is placed on the lower die 2. W is placed thereon. A preliminary bending die surface 2a is formed on the side upper surface of the lower mold 2 to correspond to the bent portion a of the press work W and to bend the tip of the bent portion a to a predetermined preliminary bending angle. .

Reference numeral 3 denotes an upper mold holder which is disposed above the lower mold holder 1 and is moved up and down by a press device (not shown) in opposition to the lower mold holder 1, and a spring is attached to the lower surface of the upper mold holder 3. 4, a pad 5 is suspended and supported so as to be vertically movable facing the lower mold 2, and the pad 5 and the lower mold 2 work together to start the press work W from the middle of the lowering of the upper mold holder 3. It is configured to be held in place.

Further, on the lower surface of the upper die holder 3, a preliminary bending punch 6 is provided corresponding to the preliminary bending die surface 2a of the lower die 2.
is mounted and supported via a bracket 7 so as to be vertically movable. A pre-bending punch surface 6a is formed at the lower end of the pre-bending punch 6 to cooperate with the pre-bending die surface 2a to bend the tip of the bent part a of the press work W to a predetermined pre-bending angle. At the same time, an inclined surface 6b is formed at the upper end, and the inclined cam surface 8 of the intermediate cam 8 is formed on the inclined surface 6b.
a is in contact with it. The intermediate cam 8 has a protrusion 8b that is slidably engaged in a guide groove 9 formed in the front-rear direction on the lower surface of the upper die holder 3. The intermediate cam 8 is movable back and forth with respect to the upper mold holder 3 by being guided in motion, and is biased by a spring 10 as an elastic member to advance the intermediate cam 8 toward the preliminary bending punch 6 side. The preliminary bending punch 6 is always urged downward through the forward movement of the intermediate cam 8 by a spring 10.

On the other hand, on the side of the lower mold 2 of the lower mold holder 1, a substantially doglegged lever 12 is mounted upward through a support member 11, and rotates up and down in a plane orthogonal to the lower mold 2 with the intermediate portion as a rotation center. It is arranged so that it can swing. The lever 12 has an abutment part 12a formed at its front end (end on the side of the lower die 2) that can come into contact with the engagement part 6c formed on the preliminary bending punch 6, and an abutment part 12a above the rear end. A pressing member 13 hanging down from the lower surface of the upper mold holder 3 is provided so as to be able to come into contact with it, and after the preliminary bending is completed, the rear end of the lever 12 is connected to the pressing member 13
(Upper mold holder 3) presses downward, and the contact part 12a of the lever 12 contacts the engagement part 6c of the pre-bending punch 6, causing the pre-bending punch 6 to resist the biasing force of the spring 10. configured to rise.

Further, a hemming cam 14 is disposed on the lower mold holder 1 so as to face the lower mold 2 laterally, while the hemming cam 14 is disposed on the upper surface of the lower mold holder 1.
A guide groove 15 is formed in a direction perpendicular to the lower mold 2, that is, in a front-back direction. A projecting piece 14a protruding from the lower surface of the hemming cam 14 is slidably engaged with the guide groove 15, and the projecting piece 14a of the hemming cam 14 and the end surface of the guide groove 15 on the lower mold 2 side A spring 16 is interposed between the hemming cam 14 and the guide groove 1.
It is provided so as to be movable back and forth with respect to the lower die 2 under the guides 5 and is always urged in the backward direction by a spring 16. Further, a pre-bent press work W is provided at the front end of the hemming cam 14.
A hemming cam surface 14b for hemming the tip of the bent portion a is formed protrudingly, and an inclined cam surface 14c that can come into contact with an inclined cam surface 17a of a driver cam 17, which will be described later, is formed on the rear end. It is formed.

Furthermore, 17 is a driver cam attached to the lower surface of the upper mold holder 3 in correspondence with the hemming cam 14, and the lower end of the driver cam 17 is provided with an inclined cam of the hemming cam 14 after the preliminary bending is completed. An inclined cam surface 17a is formed in contact with the surface 14c to move the hemming cam 14 forward against the biasing force of the spring 16. Based on the above,
The hemming device A of the present invention is configured to simultaneously perform preliminary bending and hemming of the tip of the bent portion a of the press work W when the upper die holder 3 is lowered.

Note that 18 is a support member 11 that supports the lever 12.
It is a hollow cylinder part formed in the cylinder part 18, and inside the cylinder part 18 is a lever 12 that protrudes upward.
A piston 19 having a rod portion 19a that abuts the lower surface of the rear end is slidable in the vertical direction and is urged upwardly by a spring 20 and inserted into the piston. During bending, the front end portion is biased and held in a substantially horizontal position where it does not interfere with the preliminary bending punch 6. Reference numeral 21 denotes a stopper portion that is formed protruding from the side of the lower mold holder 1 in correspondence with the rear end portion of the hemming cam 14.
This controls the retracted position of the 22 is a guide member attached to the upper surface of the stopper portion 21, and the guide member 22 is connected to the driver cam 17.
The driver cam 17 is in contact with the outer side surface of the driver cam 17.
It guides the vertical movement of the

Next, the operation of the hemming processing device A is
This will be explained with reference to the figures and FIG. First, a press work W to be hemmed is pressed so that the bent part a of the press work W is the pre-bending die surface 2a of the lower die 2.
Place it at a predetermined position on the lower mold 2 so that it is located above.

After that, when the upper die holder 3 is moved downward by the press device, the pad 5 first comes into contact with the press work W on the lower die 2, and the press work W is held between the pad 5 and the lower die 2. be done.

Subsequently, when the upper mold holder 3 is further moved downward, the preliminary bending punch surface 6a of the preliminary bending punch 6 comes into contact with the bent part a of the press work W, and the preliminary bending is completed. With the bent part a of the press work W being sandwiched between the punch face 6a and the pre-bending die face 2a of the lower mold 2, a pre-bending process is performed to bend the tip of the bent part a to a predetermined pre-bending angle. It will be done. Here, since the lever 12 is in a horizontal state where the front end portion (contact portion 12a) does not contact the engagement portion 6c of the pre-bending punch 6 due to the rod portion 19a of the piston 19, the pre-bending process is performed on the lever. 12.

Subsequently, when the upper mold holder 3 is further moved downward, the pressing member 13 attached to the upper mold holder 3 pushes the rear end of the lever 12 with the pressing force ( By pressing the lever 12 with a pressure larger than the biasing force of the spring 20 (biasing force of the spring 20) and rotating the lever 12 counterclockwise in the figure, the abutting portion 12a of the lever 12 comes into contact with the engaging portion 6c of the preliminary bending punch 6. In contact with the preliminary bending punch 6
is raised against the biasing force of the spring 10.
Also, almost at the same time as the preliminary bending punch 6 rises, the inclined cam surface 17a of the driver cam 17 comes into contact with the inclined cam surface 14c of the hemming cam 14, causing the hemming cam 14 to move forward against the biasing force of the spring 16. , this makes the hemming cam 1
The hemming cam surface 14b of No. 4 comes into contact with the tip of the bent portion a of the pre-bent press work W as described above, and the hemming cam surface 14b and the pre-bending die surface 2a of the lower die 2 form the bent portion. Hemming is performed to pinch the tip and completely bend it.

Therefore, in this way, by one downward movement of the upper die holder 3, the preliminary bending process and the hemming process of the tip of the bending part a of the press work W are simultaneously performed in series, and both processes are performed at once. Since only a few steps are required, work efficiency can be improved, and the installation space for the devices can also be narrowed, making it possible to reduce the space required.

Moreover, the preliminary bending process is performed by sandwiching the tip of the bent part a of the press work W between the preliminary bending punch surface 6a of the preliminary bending punch 6 and the preliminary bending die surface 2a of the lower die 2, so that the preliminary bending process Preliminary bending can be performed accurately according to the surfaces (pre-bending punch surface 6a and pre-bending die surface 2a). In addition, as a result, even when hemming the end of a press work whose end is curved, for example, by changing the surface of the pre-bending die, the pre-bending shape can be adjusted according to the shape of the end of the press work. Since the hemming can be formed into any shape, the range of application of the hemming process can be expanded by increasing the degree of freedom of the pre-bending shape.

Furthermore, the upward movement (retracting movement) of the preliminary bending punch 6 after the preliminary bending is completed is reliably and quickly carried out by the lever 12, which swings up and down as the upper die holder 3 descends, so that The timing of transition to the retracting movement can be set relatively freely, and as a result, it is possible to prevent malfunctions due to manufacturing errors of members, etc.

Note that the present invention is not limited to the above-mentioned embodiments, but includes various other modifications. For example, in the above embodiment, the pad 5 is attached to the upper mold holder 3.
The pad 5 and the lower die 2 are used to hold the press work W, but the pad is not provided in cases where the press work W is stabilized by its own weight when placed on the lower die, such as a large press work. You can.

Further, in the above embodiment, the upper mold holder 3 is provided with a pressing member 13 separate from the driver cam 17, and the pressing member 13 presses one end of the lever 12 after the preliminary bending is completed. Alternatively, a protruding part may be integrally molded on the driver cam, and the lever may be pressed by the protruding part after the preliminary bending is completed. In this case, there is an advantage that the number of parts can be reduced.

As explained above, according to the present invention, as the upper die holder moves downward, the end of the press work is pre-bent by the pre-bending die surface of the lower die and the pre-bending punch, and then the lever After the pre-bending punch is retracted by the swing of the hemming cam, the pre-bending punch is hemmed to completely bend the pre-bent end, so the pre-bending and hemming are performed in one process. This can be done at the same time, improving work efficiency and reducing the installation space for equipment. Moreover, by changing the surface of the pre-bending die and the die surface of the pre-bending punch according to the shape of the end of the press work, the pre-bending shape can be freely changed, expanding the range of application of hemming processing. can be achieved.
In addition, since the pre-bending punch is retracted by swinging the lever as the upper die holder moves downward, it is possible to increase the degree of freedom in setting the transition timing from pre-bending to retracting the pre-bending punch. It is effective.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a longitudinal sectional view showing the state during preliminary bending, and FIG. 2 is a longitudinal sectional view showing the state during hemming. A... Hemming device, W... Press work, 2
...lower die, 2a...preliminary bending die surface, 3...upper die holder, 6...preliminary bending punch, 10...spring, 12...lever, 13...pressing member, 1
4... Hemming cam, 14b... Cam surface for hemming, 17... Driver cam, 17a... Inclined cam surface.

Claims (1)

[Scope of utility model registration request] In a hemming device for performing hemming after pre-bending an end of a press work, the device comprises: a lower die on which the press work is placed and on which a pre-bending die surface is formed on the upper side surface; and an upper die holder which faces the lower die and is moved up and down by a press device;
a pre-bending punch supported by the upper holder so as to be vertically movable opposite to the pre-bending die surface of the lower holder and constantly biased downward by an elastic member; and a lever provided at a middle portion so as to be vertically swingable, one end of which is pressed by the upper holder after completion of pre-bending, and the other end of which raises the pre-bending punch.
A hemming device comprising: a hemming cam that is provided so as to be movable back and forth relative to the lower die and has a cam surface for hemming formed at its front end; and a driver cam that is attached to the underside of the upper die holder and has an inclined cam surface formed at its lower end that comes into contact with the rear end of the hemming cam after preliminary bending is completed and moves the hemming cam forward, wherein the downward movement of the upper die holder simultaneously performs preliminary bending and hemming of the end of the press work.