JPH06285560A - Work positioning device of hemming die - Google Patents

Abstract

PURPOSE:To provide the work positioning device of a hemming die, by which positioning can be executed exactly without deforming the upper side panel, even in the case deviation in a position is generated in a location hole of the upper side panel of a work. CONSTITUTION:In the work positioning device of a hemming die for executing hemming to end parts of two pieces of upper and lower panels P1, P2 for constituting a work W, a location pin 15 inserted through a location hole H of the upper side panel P1 is provided in the upper die 5 for ascending and descending opposingly to the lower die 1 so as to be freely movable within a prescribed range in the horizontal direction. Also, a restricting member 16 which is detained and detached to and from the upper end part of the location pin 15 following the vertical motion, and also, positions the location pin in a normal position following the downward motion is provided, and in the same upper die 5, a spring 17 for energizing the restricting member 16 in the upper direction, and a push-pressure transfer mechanism 18 abutting on the lower die 1 as the upper die 5 descends and push-moving the restricting member 16 in the lower direction are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hem type in which hemming is performed at the ends of two upper and lower panels constituting a work, and the hem type is mainly used to position the upper panel. The present invention relates to the work positioning device.

[0002]

2. Description of the Related Art Conventionally, as a heme-type work positioning apparatus, as shown in FIG. 5, for example, a lower mold 101 on which a work W is placed is provided with a positioning nest 102, which is moved up and down so as to face it. In some of the upper molds 103, locate pins 104 to be inserted into the locate holes H of the work W are provided.

The work W in this case is composed of a three-dimensional upper panel P1 and a flat lower panel P2. The upper panel P1 has a locate hole H and a hemming edge E. The lower panel P2 is provided with a hemming flange F folded over the hemming edge E in a state of being bent upward by 90 degrees.

The work positioning device positions the lower panel P2 by the nest 102 of the lower mold 101, and connects the ends of both panels P1, P2 by a hemming mechanism such as a punch as the upper mold 103 descends. In the process, the locate pin 104 of the upper mold 103 is inserted into the locate hole H, and the upper panel P1 is positioned.

[0005]

By the way, in the hem type, when the work W is set on the lower die 101, the lower panel P2 is positioned by the nest 102, but the upper panel P1 is just placed. However, since the positioning is not perfect, the position of the locate hole H may be displaced with respect to the locate pin 104.

On the other hand, in the above-mentioned conventional heme type work positioning device, the locate pin 1 is attached to the upper die 103.
Since 04 is provided in a fixed state, if the locate hole H is displaced, the locate pin 104 may deform the edge of the locate hole H, or the upper panel P1 itself may be deformed as shown by a virtual line in FIG. However, there is a problem in that the accuracy of positioning is impaired by this, and therefore improvements have been desired to prevent such problems.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional circumstances, and when hemming is performed even when the locate hole of the upper panel constituting the work is misaligned.
An object of the present invention is to provide a heme-type work positioning device that can perform accurate positioning without deforming the upper panel.

[0008]

A hem type work positioning device according to the present invention is a hem type work positioning device for performing hemming on the ends of upper and lower two panels constituting a work. A locating pin that is inserted into the locating hole of the upper panel is movably provided in the upper die that moves up and down facing each other within a predetermined horizontal range, and moves up and down to engage and disengage at the upper end of the locating pin. Accordingly, a restraining member for positioning the locate pin at a regular position is provided, and a spring for urging the restraining member in an upward direction is provided on the upper mold, and the lower die is brought into contact with the lower mold as the upper mold descends. A pressing force transmission mechanism that pushes in the direction is provided, and the above configuration is used as a means for solving the problem.

[0009]

In the heme type work positioning apparatus according to the present invention, when the locate hole of the upper panel constituting the work is misaligned, the lower die is moved in the descending process.
The locate pin that enters the locate hole moves horizontally by the amount of the positional deviation, and the locate pin is inserted into the locate hole without deforming the upper panel.

Then, when the upper die further descends and the pressing force transmitting mechanism comes into contact with the lower die, the restraining member which has been biased upward by the spring is pushed downward by the pressing force transmitting mechanism. As the restraining member engages with the upper end of the locate pin, the locate pin is corrected and positioned at a proper position, and at the same time, the position of the upper panel is corrected. After this, hemming is performed on both panels.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS. The work W in this embodiment is
For example, in a vehicle door, the three-dimensionally formed upper panel P1 corresponds to an inner panel, and the two-dimensionally formed lower panel P2 corresponds to an outer panel. Further, the upper panel P1 is provided with a locate hole H and a hemming edge portion E, and the lower panel P2 is provided with a hemming flange F that is folded over the hemming edge portion E and bent upward by 90 degrees. It is provided in the state.

As shown in FIG. 1, the heme type has a lower die 1
Work receiver 2 on which a work (lower panel P2) W is placed,
The upper die 5 is provided with an oscillating body 4 provided with a hemming blade 3, a nest (not shown) for positioning a workpiece, and the like. It is equipped with a punch 7 and the like.

The oscillating body 4 is attached to the upper end of a support block 8 erected on the lower mold 1 through a support shaft 9,
A guide engaging portion 10 is provided on the upper end portion protruding to the outside of the mold. The driver 6 is provided at its lower end with a drive cam 11 that engages with the guide engaging portion 10 of the rocking body 4. The hemming punch 7 is attached to a support block 12 suspended from the upper die 5. The upper die 5 has moved further upward than the position shown in FIG. 1 when the work is loaded.

A holding plate 14 is horizontally suspended from the upper die 5 by a plurality of retainers 13 having an elastic body and the like. The holding plate 14 has a locate pin 15 and a locate pin 15 constituting a work positioning device. In the engaged and disengaged state, the constraining member 16 that positions the locate pin 15 in the normal position in the engaged state, the spring 17 that biases the constraining member 16 upward, and the pusher that pushes the constraining member 16 downward. A pressure transmission mechanism 18 is provided.

As shown in FIG. 3 (a), the holding plate 14 is formed with an opening 19 which communicates vertically with the location of the locate pin, and a flange is formed below the opening 19. The attached cylindrical member 20 is fixed by a bolt 21.

The locating pin 15 has a downward pointing main body portion, and the collar portion 1 is provided on the upper portion of the main body portion.
5a, and further has a pointed upper end 15b facing upward on the upper side of the flange 15a. This locate pin 15
The upper end portion 15b is inserted into the cylindrical member 20, and is held at the flange portion 15a by a pin holder 22 screwed to the lower end portion of the cylindrical member 20. Also,
Between the outer circumference of the upper end portion 15b and the inner circumference of the cylindrical member 20, and between the flange portion 15a and the inner circumference of the pin holder 22, a gap of about half the radius of the main body portion is provided over the entire circumference. As a result, the locate pin 15 is in a state of being movable in the horizontal direction by the gap, as indicated by an imaginary line in FIG. A metal ring 23 for preventing seizure is provided between the cylindrical member 20 and the pin holder 22.
Is installed.

The restraining member 16 has a recess 16a for engaging the locate pin which is opened downward, and a taper portion 16b for smooth engagement is formed at the opening edge of the recess 16a. It is housed in the cylindrical member 20 so as to be vertically movable, and the pressing force transmission mechanism 18 is connected to the upper end portion.

The pressing force transmission mechanism 18 is provided with a tube 24.
A wire 25 is slidably inserted therein, and one end of the wire 25 is connected to the restraining member 16. Also, as shown in FIG. 3B, one end of the tube 24 is constrained by a connecting member 27 fixed to the upper end of the cylindrical member 20 with a bolt 26 and a stopper 28 screwed to the connecting member 27. There is.

The other end side of the pressing force transmission mechanism 18 is guided to a transmission mechanism holder 30 of a holding block 29 vertically provided on the holding plate 14. The transmission mechanism holder 30 has upper and lower three-stage holding portions 30a to 30c, and the upper holding portion 30a.
The other end of the tube 24 is constrained by. The other end of the wire 25 penetrates through the middle and lower holding portions 30b and 30c and extends downward, and at the lower end thereof, a pressing portion 32 facing the stopper 31 of the lower mold 1 is provided.

The stopper 31 is provided on the upper end of a column 33 standing on the lower mold 1. Further, in this embodiment, the spring 17 for urging the restraining member 16 upward is mounted between the collar 25a provided on the wire 25 and the middle holding portion 30c of the transmission mechanism holder 30. . Further, the holding plate 14 is provided with a work retainer 34 for pressing the base end portion of the hemming edge portion E of the upper panel P1.

The hem type equipped with the above-mentioned work positioning device has a work (lower panel P
2) After the W is positioned on the work receiver 2, the upper die 5 is lowered, the locate pin 15 is inserted into the locate hole H, and the work retainer 34 is located at the base end portion of the hemming edge E. Contact and position the upper panel P1. After this, by the drive cam 11 of the driver 6,
As shown by the phantom line in FIG. 2, the oscillating body 4 is pushed toward the work side, and the hemming blade 3 temporarily bends the hemming flange F of the lower panel P2. Then, when the upper die 5 is further lowered, as shown in FIG. 2, the oscillating body 4 oscillates to the outside of the die by the guide by the drive cam 11, and finally, the work receiver 2 and the hemming punch 7 are separated. In between, the hemming flange F is completely bent.

Here, in the work positioning device in the heme type, when the locate hole H is displaced with respect to the locate pin 15, as shown in FIG. The locate pin 15 moves horizontally, and as shown in FIG. 4B, the locate pin 15 is inserted into the locate hole H without deforming the upper panel P1.

When the upper die 5 further descends and the pressing portion 32 of the pressing force transmission mechanism 18 comes into contact with the stopper 31 on the lower die 1 side, the spring 17 is compressed and is applied upward by the spring 17. The restraining member 16 that has been urged is pushed downward via the wire 25 of the pushing force transmission mechanism 18, and the upper end portion 15b of the locate pin 15 is engaged with the recess 16a of the restraining member 16. Accordingly, FIG. 4 (c)
As shown in, the locate pin 15 is corrected and positioned on the center line of the cylindrical member 20, which is the regular position, and at the same time, the position of the upper panel P1 is corrected.

In this way, in the heme type equipped with the above-mentioned work positioning device, the upper panel P1 is accurately positioned and the two panels P1 and P2 are positioned even if the locate hole H is displaced. Hemming will be performed.
After the hemming is completed, as the upper die 5 moves upward, the repulsive force of the spring 17 and the wire 25 restrain the member 1 for restraint.
6 is pulled up, and the locate pin 15 remains positioned on the center line of the cylindrical member 20.

The operation of the work positioning device,
The timing of the operation of the work clamp 34 can be changed. For example, when the position error of the upper panel P1 causes a displacement of the locate hole H,
By first performing the operation of the work positioning device, the position of the upper panel P1 is corrected and then the upper panel P1 is pressed, while the upper panel P1 that has been subjected to the drawing process has the shape of the locate hole forming portion. When the position of the locate hole H is displaced due to a slight deformation due to partial difference in rigidity or the like, the operation of the work retainer 34 is performed first, so that the subsequent operation of the work positioning device can be performed. It is possible to correct the deformation of the upper panel P1.

Further, the work positioning device of the present invention is not limited in its detailed structure to the above-mentioned embodiment only, and may be a holding means such as a locate pin or a restraining member in the upper die,
Alternatively, it is possible to appropriately change the location where a spring for urging the restraining member upward is provided.

[0027]

As described above, according to the hem type work positioning device of the present invention, when the locate hole of the upper panel forming the work is misaligned, the upper panel is not deformed. Since the positional deviation can be corrected, accurate positioning can always be performed, which in turn can contribute to improvement in hemming accuracy.

[Brief description of drawings]

FIG. 1 is a cross-sectional view illustrating a heme-type work positioning device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a state where the heme type upper die shown in FIG. 1 has reached bottom dead center.

FIG. 3 is an enlarged sectional view (a) of a portion of a locate pin shown in FIG. 1 and a horizontal sectional view (b) of a portion of a connecting member.

FIG. 4 is a cross-sectional view illustrating a state (a) in which a locate pin has started to enter the locate hole, a state (b) in which the center lines of the locate hole and the locate pin are aligned, and a state (c) in which the restraining member is lowered.

FIG. 5 is a cross-sectional view illustrating a conventional hem type work positioning device.

[Explanation of symbols]

 H Locate hole P1 Upper panel P2 Lower panel W Work 1 Lower mold 5 Upper mold 15 Locate pin 16 Restraint member 17 Spring 18 Pressing force transmission mechanism

Claims (1)

[Claims] 1. A heme-type workpiece positioning device for hemming the ends of two upper and lower panels constituting a workpiece, wherein the upper die moves up and down facing the lower die and is inserted into the locate hole of the upper panel. The locate pin is provided so as to be movable within a predetermined range in the horizontal direction, and a restraining member that engages with and disengages from the upper end of the locate pin as it moves up and down and positions the locate pin at a normal position as it moves downward. The die is provided with a spring for urging the restraint member upward, and a pressing force transmission mechanism for pushing the restraint member downward by contacting the lower die as the upper die descends. Heme type work positioning device.