JPS6331784Y2 - - Google Patents

Description

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

(Prior Art) Conventionally, when hemming the end of a press work, the end of the press work is pre-bent in a separate process, and then the pre-bent end is completely hemmed. The hemming process is done so that it can be bent. 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 the end of the press work is pre-bent by 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).

(Problem to be solved by the invention) However, in the above proposal, the preliminary bending of the end of the press work is performed by pressing the end of the press work from above with a preliminary bending cam without supporting the end of the press work in any way from the bending direction. Since the hemming is carried out by hand, the bent corners of the hemming are formed out of position, resulting in inaccurate processing.

The present invention has been developed in view of this point, and includes a pre-bending die in the lower die and a pre-bending punch in the upper die holder, which are movable up and down, and both of which regulate the bending position of the end of the press work. After pre-bending in this state, the pre-bending punch and the pre-bending die are moved up and down using a hemming cam while hemming the pre-bent end. The purpose is to perform preliminary bending and hemming at the same time, thereby improving work efficiency and reducing the installation space, while also making it possible to accurately form the bent corner of the hemming at a predetermined position. It is something.

(Means for Solving the Problems) In order to achieve this object, the configuration of the present invention is to provide a hemming device that performs hemming after pre-bending the end of a press work.
a lower mold on which a press work is placed; an upper mold holder that is moved vertically by a press device in opposition to the lower mold; a pad that cooperates with the lower die to clamp the press work from the middle of its descent;
It is supported by the side part of the lower die so as to be movable up and down via an elastic member, and has a regulating part at the upper end that regulates the bending position of the end of the press work during hemming, and a reserve extending from the regulating part. A pre-bending die on which a bending die surface is formed, and a pre-bending die on the side of the pad that is vertically movably supported by an upper mold holder via an elastic member at a position opposite to the pre-bending die, and the pre-bending die on the lower end thereof. a pre-bending punch formed with a pre-bending die surface for pre-bending the end portion of the press work in cooperation with the pre-bending die surface of the die;
a hemming cam having a hemming cam surface and an inclined cam surface that presses and moves the pre-bending punch and the pre-bending die vertically when approaching the lower die; and a hemming cam attached to the lower surface of the upper die holder. The hemming cam comprises a driver cam having a lower end formed with an inclined cam surface that contacts the rear end of the hemming cam to advance the hemming cam after preliminary bending is completed. As a result, as the upper mold holder moves downward, the end of the press work is pre-bent by the pre-bending die and the pre-bending punch with the bending position determined by the regulating part, and the pre-bent end is Hemming is performed using a hemming cam, and both processes are performed simultaneously in one process.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

FIG. 1 shows a hemming device A which is an embodiment of the present invention. Press work W
The hemming process is carried out after pre-bending the hemming parts b, b. The hemming device A has a lower mold holder 1 that is supported in a fixed state, and a lower mold 2 on which the press work W is placed is integrally formed in the center of the lower mold holder 1. Reference numeral 3 denotes an upper die holder which is disposed above the lower die holder 1 and is moved up and down opposite the lower die holder 1 (lower die 2) by a press device (not shown); A spring 4 as an elastic member is provided at the center of the lower surface, that is, at a portion facing the lower mold 2.
The pad 5 is suspended and supported so as to be vertically movable. The lower end of the pad 5 has a fitting portion 5a that can be fitted into the press work W placed on the lower die 2.
is formed, and is configured to clamp the press work W in cooperation with the lower mold 2 from the middle of the lowering of the upper mold holder 3.

Further, on both sides of the lower die 2 (only one side is shown in the drawing), a fitting groove 6 that opens upward corresponding to the side wall a of the press work W is formed. A pre-bending die 8 is fitted so as to be slidable in the vertical direction via a spring 7 as an elastic member, and the pre-bending die 8 is supported by the lower mold 2 so as to be movable up and down. The upper end of the preliminary bending die 8 has a press work W on the inside (lower mold 2 side).
An inclined cam in which a regulating part 8c and a preliminary bending die surface 8a for bending the hemming part b to a predetermined preliminary bending angle can abut on the outside an inclined cam surface 12d on the lower side of the front end of the hemming cam 12, which will be described later. A surface 8b is formed respectively. The regulating portion 8c is for regulating the bending position of the end portion of the press work W during hemming, and the preliminary bending die surface 8a is formed extending from the regulating portion 8c.

On the other hand, a pre-bending die 8 on the side of the pad 5
A preliminary bending punch 9 is suspended and supported by the upper die holder 3 via a spring 10 as an elastic member so as to be movable up and down along the side surface of the pad 5 at a position facing the pad 5. The lower end of the pre-bending punch 9 has a hemming part b of the press work W bent at a pre-determined pre-bending angle in cooperation with the pre-bending die surface 8a of the pre-bending die 8 on the inside (on the pad 5 side). A preliminary bending mold surface 9a for bending is provided on the outside with an inclined cam surface 12 on the upper side of the front end of a hemming cam 12, which will be described later.
An inclined cam surface 9b that can be brought into contact with the cam surface 9a is formed on each of the cam surfaces 9b.

Furthermore, a sliding surface 11 is formed in the horizontal direction on the upper surface of the lower mold holder 1 adjacent to the lower mold 2,
A hemming cam 12 is arranged on the slide surface 11. Further, a guide groove 13 is formed in the slide surface 11 in a direction perpendicular to the lower die 2, and a protrusion 12a protruding from the lower surface of the hemming cam 12 is slidably engaged with the guide groove 13. A spring 15 is interposed between the protruding piece 12a of the hemming cam 12 and the pin 14 implanted in the guide groove 13. Therefore, the hemming cam 12 It is provided so as to be movable back and forth with respect to the lower die 2 under the guide of , and is biased in the backward direction by a spring 15 . Further, at the front end of the hemming cam 12, there is a hemming cam surface 12b for hemming the hemming portion b of the press work W pre-bent in the center in the vertical direction.
An inclined cam surface 12c is provided on the upper and lower sides of the cam surface 12b for pressing and moving the pre-bending punch 9 and the pre-bending die 8 up and down against the biasing forces of springs 10 and 7, respectively, when approaching the lower die 2. ,12d
are formed respectively, and an inclined cam surface 12e that can come into contact with an inclined cam surface 16a of a driver cam 16, which will be described later, is formed at the rear end portion.
Here, a spring 10, which supports the preliminary bending punch 9 and the preliminary bending die 8, respectively, is used.
7 has sufficient rigidity to pre-bend the hemming portion b of the press work W, but when receiving the pressing force from the front end side inclined cam surfaces 12c and 12d of the hemming cam 12, the pre-bending punch 9 and the pre-bending The rigidity is set so that the dice 8 can move up and down smoothly.

Furthermore, 16 is a driver cam attached to the lower surface of the upper mold holder 3 in correspondence with the hemming cam 12, and the rear end of the hemming cam 12 is attached to the lower end of the driver cam 16 after the preliminary bending is completed. An inclined cam surface 16a is formed in contact with the side inclined cam surface 12e to move the hemming cam 12 forward against the biasing force of the spring 15. As described above, the hemming device A of the present invention is constructed, which simultaneously performs preliminary bending and hemming of the hemming portion b of the press work W by the downward movement of the upper die holder 3.

Note that 17 is a guide wall protruding from the lower surface of the upper mold holder 3, and the guide wall 17 is used for the preliminary bending punch 9.
It extends downward along the outer side surface of the pre-bending punch 9, and when the pre-bending punch 9 moves up and down, it restrains and guides the pre-bending punch 9 from the outside. Also, 1
Reference numeral 8 denotes a stopper protruding from the side of the sliding surface 11 of the lower die holder 1. The stopper 18 regulates the retreating position of the hemming cam 12, and is in contact with the outer side surface of the driver cam 16. It guides the vertical movement of the driver cam 16.

Next, the operation of the hemming processing device A is
This will be explained with reference to the drawings and FIG. First, hemming parts b, b protruding in the horizontal direction are hemmed.
The side wall a of the press work W has a pre-bending mold surface 8 of the pre-bending die 8.
Place it at a predetermined position on the lower mold 2 so as to make contact with a.

After that, when the upper mold holder 3 is moved downward by the press device, the fitting part 5a of the pad 5 first fits into the press work W on the lower mold 2, and the pad 5 and the lower mold 2 are connected. The press work W is held between the two.

Subsequently, when the upper die holder 3 is further moved downward, the preliminary bending die surface 9a of the preliminary bending punch 9 comes into contact with the hemming part b of the press work W, as shown in FIG. A preliminary bending process is performed. At this time, the pre-bending die 8 is placed on the hemming side (lower side in the figure) of the hemming part b of the press work W as described above, and the regulating part 8c of the pre-bending die 8 is used to control the hemming part b of the press work W. While determining the bending position, the preliminary bending die 8
and both preliminary bending mold surfaces 8a, 9 of the preliminary bending punch 9.
Since the preliminary bending process is performed with the hemming part b of the press work W being held between the members a, the hemming part b of the press work W is can be pre-bent precisely in place.

Subsequently, when the upper die holder 3 is further moved downward, the inclined cam surface 16a of the driver cam 16 comes into contact with the rear end side inclined cam surface 12e of the hemming cam 12, and the hemming cam 12 resists the biasing force of the spring 15. and move it forward toward the lower mold 2 side. As the hemming cam 12 moves forward, as shown in FIG.
c and 12d contact the inclined cam surfaces 9b and 8b of the pre-bending punch 9 and the pre-bending die 8, and move both 9 and 8 up and down against the biasing forces of the springs 10 and 7, respectively, during hemming. The hemming cam surface 12b of the cam 12 comes into contact with the hemming part b of the press work W which has been pre-bent as described above, and the side wall part a of the press work W and the hemming part b are connected by the hemming cam 12 and the pad 5. The hemming process is performed so that the hemmed portion b is completely bent in the sandwiched state.

Therefore, in this way, the hemming portion b of the press work W is removed by one downward movement of the upper mold holder 3.
The preliminary bending process and hemming process are performed simultaneously in series, and both processes can be performed at once, improving work efficiency and requiring less space for equipment installation. I can do it.

Moreover, since the hemming part b of the press work W is hemmed after being accurately pre-bent at a predetermined position, a hemmed molded product having a hemming bending angle of a predetermined shape can be obtained, and product precision can be improved. I can do it.

In the above embodiment, the case where the upper ends of both side walls a and a of the channel-shaped press work W are hemmed is described, but the present invention can be applied to hemming the ends of press works of various other shapes. It is also applicable.

Further, in the above embodiment, the springs 4, 7, and 10 were used as elastic members for vertically movably supporting the pad 5, pre-bending die 8, and pre-bending punch 9, but other known elastic means such as rubber may be used. can also be adopted.

(Effect of the invention) As explained above, according to the invention, the pre-bending die and the pre-bending punch are controlled while the bending position of the end of the press workpiece is controlled by the regulating part as the upper mold holder moves downward. Since the pre-bending process is performed using a hemming cam, the pre-bending process and the hemming process are performed in series in one process. In addition to improving work efficiency and reducing the installation space for equipment, the provision of a regulating part on the pre-bending die allows the bent corner to be accurately placed in the specified position during hemming. Since it can be molded, accurate hemming processing can be performed and product precision can be improved.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a sectional view showing the overall structure during preliminary bending, and FIG. 2 is a partially enlarged sectional view during hemming. A... Hemming processing device, W... Press work, b... Hemming section, 2... Lower die, 3... Upper die holder, 4... Spring, 5... Pad, 7...
...Spring, 8...Preliminary bending die, 8a...
Preliminary bending die surface, 8c...Restriction part, 9... Preliminary bending punch, 9a... Preliminary bending die surface, 10... Spring, 12... Hemming cam, 12b... Hemming cam surface, 12c, 12d ... Inclined cam surface, 16 ... Driver cam, 16a ... Inclined cam surface.

Claims (1)

[Scope of utility model registration request] A hemming device that performs hemming after preliminary bending of the end of a press work includes a lower die on which the press work is placed, and an upper die holder that is moved up and down by the press device in opposition to the lower die. a pad that is vertically movably supported by the upper mold holder via an elastic member and that cooperates with the lower mold to clamp the press work from the middle of the lowering of the upper mold holder; and an elastic pad on the side of the lower mold. It is supported so as to be vertically movable via a member, and a regulating part for regulating the bending position of the end of the press work during hemming, and a pre-bending mold surface extending and continuous with the regulating part are formed at the upper end. a pre-bending die; and a pre-bending die which is vertically movably supported by an upper die holder via an elastic member at a position opposite to the pre-bending die on the side of the pad, and has a pre-bending die surface of the pre-bending die at its lower end. A pre-bending punch is provided with a pre-bending mold surface that cooperates to pre-bend the end of the press work, and the pre-bending punch is provided so as to be movable back and forth with respect to the lower mold, and has a hemming cam surface and a lower mold at the front end. A hemming cam is provided with an inclined cam surface that presses and moves the pre-bending punch and the pre-bending die up and down when approaching the hemming cam. It consists of a driver cam formed with an inclined cam surface that contacts the rear end of the cam and moves the hemming cam forward, so that preliminary bending and hemming of the end of the press work can be performed simultaneously by the downward movement of the upper die holder. A hemming processing device characterized by: