JP6318664B2 - Roll flange processing method - Google Patents

Description

  The present invention relates to a roll flange processing method in which a flange is bent using a roller at an end of a panel, and more specifically, a flange is bent from a so-called flat plate state without a bend to the end of a panel. The present invention relates to a roll flange processing method.

  In assembling an opening / closing body composed of an outer panel and an inner panel, as typified by an automobile door panel, a hemming coupling method is widely adopted. In this hemming connection method, a hemming flange portion is formed upright in advance on the peripheral portion of the outer panel, and the outer panel and the inner panel are overlapped, and then the hemming flange portion is pre-hemmed (preliminary bending) and main hemming is performed. By sequentially performing the processing, the hemming flange portion is folded back to the inner panel side to form a so-called clinched state, and the outer panel and the inner panel are firmly hemmed together. Patent Document 1 discloses a hemming technique using a roller for each of the flange standing process, the pre-hemming process, and the main hemming process.

JP-A-5-253626

  However, in the technique described in Patent Document 1, since it is difficult to bend the end portion of the outer panel without a bend as a flange portion at the time of standing up the flange, it is shown in FIG. As described above, it is necessary to bend the end 4a of the outer panel in advance, which increases the number of man-hours.

  The present invention has been made paying attention to such a problem, and a roll flange processing method that is considered so that the flange portion can be bent even when the end portion of the panel is not bent. In addition, the present invention provides a roll flange processing method that is considered so as not to damage the flange portion by a roller that performs bending of the flange portion.

In the present invention, when a flange portion is formed by bending an end portion of a panel that is not bent, the front and back sides of the end portion region of the end region are left and left, leaving an end region to be the flange portion. After pressing and restraining from both sides with a pressing mold, the roller held by the industrial robot is rolled in the longitudinal direction while pressing in the bending direction against the end region, and the end portion has a pressing rolling operation by this roller. Ru Monodea that the way of bending the edge region while wearing the habit bending as point bending pressing type corner position corresponding of the area from the bending base.
Then, the pressing and rolling operation by the roller is repeated a plurality of times while changing the angle of the roller, and the region other than the last pressing and rolling operation by the roller is separated from the vicinity of the bent base in the end region. On the other hand, the pressing and rolling operation by the roller is performed, and in the final pressing and rolling operation by the roller, the roller is pressed against the entire height of the end region to perform the pressing and rolling operation by the roller.
Furthermore, those to be upon any pressing rolling operation industry by the rollers, the angle portion between the cylindrical outer peripheral surface and the end surface of the roller to control the attitude of the roller so does not touch the end regions to become the flange portion It is.

  According to the present invention, since the end region of the panel can be folded and finished as a flange portion without the bend crease at the end of the panel, it is not necessary to bend the end of the panel in advance, and the number of processing steps is reduced. Can be reduced.

  In addition, while the flange bending process using the roller is the basic, the roller posture is controlled so that the corner of the roller does not hit the end region that should be the flange, so there is no risk of scratching the flange. , Quality will not be degraded.

It is a figure which shows an example of the outer panel of the front door for motor vehicles, (A) is the front explanatory drawing, (B) is an expanded sectional view along the aa line of the same figure (A). It is a figure which shows embodiment of the roll flange processing method which concerns on this invention, (A) is process explanatory drawing of the 1st step, (B) is process explanatory drawing of the 2nd step, (C) is the process of the 3rd step. Illustration. The perspective view which shows an example of the roller unit used with the roll flange processing method of FIG. The perspective view which looked at the roller unit of FIG. 3 from the opposite direction. Explanatory drawing which shows the modification of (A) of FIG. Explanatory drawing which shows another modification of (A) of FIG. Front explanatory drawing which shows an example of the outer panel of the rear door for motor vehicles.

  FIGS. 1-7 show the more concrete form for implementing the roll flange processing method which concerns on this invention, and especially FIG. 1 has shown the outline of the outer panel of the front door (side door) for motor vehicles.

  As shown in FIGS. 1A and 1B, the outer panel 1 drawn into a predetermined three-dimensional shape in the previous process is provided with a door waist portion in preparation for hemming connection with the inner panel in the next process. The hemming flange portion 2 is formed upright on the surrounding three side portions 1a to 1c excluding 1d. 2A to 2C show a roll flange processing procedure for the hemming flange portion 2. FIG.

  As shown in FIG. 2A, the outer panel 1 is positioned on the lower mold 3 as a pressing mold with the outer plate surface facing upward, using a nest block not shown in the figure, and is opposed to the lower mold 3. Similarly, the outer panel 1 is pressed by the upper mold 4 as a pressing mold, and the lower panel 3 and the upper mold 4 pressurize and restrain the outer panel 1 from both the front and back sides.

  In this case, the end region 2a to be the flange portion 2 of the outer panel 1 remains in a so-called straight flat plate state (a state indicated by an imaginary line in FIG. 1A) that is not yet bent. The lower die 3 and the upper die 4 are pressure-constrained from both the front and back surfaces in the vicinity of the bent base 2b that is the bending point of the end region 2a, leaving the end region 2a. Thereafter, a cylindrical roller 5 for bending the flange is pressed against the end region 2a and rolled along the longitudinal direction of the end region 2a, whereby the flange portion shown in FIG. Bending for 2 is performed.

  Then, the end region 2a of the outer panel 1 is divided into a plurality of stages without being bent at once from the so-called flat plate state indicated by the phantom line in FIG. 2A to the flange portion 2 in the upright state as shown in FIG. For example, as shown in FIGS. 2A to 2C, flange bending is performed in three stages. In FIG. 2, a gap is provided between the outer panel 1 and the lower mold 3 and the upper mold 4 for easy understanding. However, in actuality, the lower mold 3 and the upper mold 4 are in close contact with the outer panel 2. Yes.

  As the roller 5, for example, a roller unit 6 as shown in FIGS. 3 and 4 is used. The roller unit 6 has a bracket 7 as a connecting portion and is not shown in the figure, for example, a teaching / playback type industry. The robot is supported at the tip of an arm of a robot (hereinafter simply referred to as a robot). The holder 8 of the roller unit 6 is provided with three types of rotatable rollers 9A to 9C having different diameters on the same axis, and selectively using these three types of rollers 9A to 9C as required. In addition to the flange bending process for the flange portion 2, it is possible to cope with the subsequent pre-hemming process and the main hemming process. Of these three types of rollers 9A to 9C, the middle roller 9B corresponds to the roller 5 in FIG. ing. As a result, the roller 5 moves based on a predetermined angle (posture) and locus.

  In the first stage shown in FIG. 2A, the end region of the outer panel 1 is pressed against the cylindrical outer peripheral surface 5a of the roller 5 inclined by a predetermined angle with respect to the end region 2a in a so-called flat plate state. While rolling along the longitudinal direction of 2a and bending the bending base 2b as a bending point so as to follow the corner 3a of the lower mold 3, it is bent downward in a so-called flange-down manner. Processing.

  In this case, if the corner portion (outer corner portion or its ridgeline) formed by the cylindrical outer peripheral surface 5a and the end surface 5b of the roller 5 hits the end region 2a of the outer panel 2 in some cases, the flange portion 2 is formed. There is a risk of scratching the power end region 2a.

  Therefore, in order to prevent the end region 2a to be the flange portion 2 from being damaged, in order to prevent the corner portion of the roller 5 from hitting the end region 2a, for example, as shown in FIG. Once the position of the roller 5 corresponding to the bending angle of the end region 2a is determined as a normal position P1 indicated by a virtual line, the position of the roller 5 is a predetermined amount from the original normal position P1 to the retracted position P2 indicated by a solid line. It is assumed that the cylindrical outer peripheral surface 5a of the roller 5 is substantially brought into contact with only the tip end position of the end region 2a and rolled. At this time, the degree of bending of the end region 2a is reduced by offsetting the roller 5, but in the first stage, the purpose is to bend the bent region 2b of the end region 2a. There is no problem.

  Alternatively, instead of the method of FIG. 5, for example, as shown in FIG. 6, the posture (angle) of the roller 5 is slightly inclined from the original angular position P11 indicated by the phantom line to the excessive angular position P12 indicated by the solid line, Similarly to the above, the cylindrical outer peripheral surface 5a of the roller 5 is brought into contact with only the tip position of the end region 2a to roll.

  Thus, by positively controlling the posture of the roller 5 as shown in FIGS. 5 and 6, damage to the end region 2a to be the flange portion 2 can be prevented in advance.

  Subsequently, in the second stage shown in FIG. 2B, the cylindrical outer peripheral surface 5a of the roller 5 whose inclination angle is larger than that in the first stage shown in FIG. 2A is pressed downward against the end region 2a. Rolling along the longitudinal direction of the end region 2a is performed so that the bending angle from the bending base 2b of the end region 2a is further increased. Even in the second stage, measures for preventing damage to the end region 2a as shown in FIGS. 5 to 7 may be executed as necessary.

  In the first and second stages shown in FIGS. 2A and 2B, the roller 5 is provided with a lower mold 3 or an upper mold in order to provide a degree of freedom in the contact angle of the roller 5 with respect to the end region 2a. 4 is not touched.

  Further, in the third stage shown in FIG. 2C, the cylindrical outer peripheral surface 5a of the roller 5 whose rotation center is substantially upright is pressed against the end region 2a along the longitudinal direction of the end region 2a. Then, the end region 2a is bent to a target flange angle to finish the flange portion 2 in a substantially upright posture. In this third stage, the roller 5 comes into contact with the lower die 3 through the end region 2a (flange portion 2) for the first time.

  As described above, according to the present embodiment, it is possible to smoothly and accurately form the substantially upright flange portion 2 from a flat plate state without bending bends only by controlling the posture (angle) and movement trajectory of the roller 5. Can be molded.

  In this case, the roller 5 has a center line that bisects the roller 5 in the axial direction substantially coincides with the bent base 2b of the flange 2 and the entire height of the flange 2 is in contact with the cylindrical outer peripheral surface 5a of the roller 5. The position is controlled and rolling is performed along the longitudinal direction of the flange portion 2. As a result, the roller 5 does not come into contact with the upper die 4, and the pressing force of the roller 5 is entirely applied to the lower die 3, so that the flange portion 2 can be pushed down and lowered. Pressurized and restrained between the mold 3 and the roller 5.

  Therefore, there is no so-called “sag” or the like in the bent base 2b, the accuracy of the corner (outer corner) of the bent base 2b is improved, and “wrinkles” are generated in the flange 2 during the bending process. Even if it is, the “wrinkle” is extended, and the shape accuracy of the flange portion 2 is also improved. In addition, since the end region 2a of the outer panel 1 positioned on the lower die 3 is bent downward as the flange portion 2 substantially following the lower die 3, the pressing force by the upper die 4 is reduced by the flange. The position and shape accuracy of the portion 2 are not affected, and this also improves the accuracy of the flange portion 2.

  Thus, the bending process of the flange portion 2 shown in FIG. 1B is completed. The processing method shown in FIGS. 2A to 2C is the same for the remaining two sides 1a and 1b of the outer panel 1 shown in FIG.

  In the present embodiment, the outer panel 1 of the automobile front door as shown in FIG. 1 has been described as an example. The same can be applied to the flange bending of the outer panel.

  Further, if the influence on the position and shape accuracy of the flange portion 2 can be ignored with respect to the pressing force by the upper die 4 described above, the present invention is a so-called flange-up form in which the flange portion 2 is bent upward. The same can be applied to the flange bending process in FIG.

DESCRIPTION OF SYMBOLS 1 ... Outer panel 2 ... Flange part 2a ... End part region 2b ... Bending base part 3 ... Lower mold | type (pressing type | mold)
4… Upper mold (holding mold)
5 ... Roller 5a ... Cylindrical outer peripheral surface 5b ... End face

Claims (3)

When forming the flange part by bending the end of the panel that is not bent ,
After restraining the vicinity of the bent base portion of the end region from the front and back surfaces with a pressing die while leaving the end region to be the flange portion of the panel,
The roller provided to the industrial robot is rolled in the longitudinal direction while pressing in the bending direction against the end region, and the pressing portion by the roller is used to bend the position corresponding to the corner of the holding die in the end region. A method of bending an end region from a bent base while making a bend as a point ,
The above-mentioned pressing and rolling operation by the roller is repeated a plurality of times while changing the angle of the roller.
Other than the last pressing rolling operation by the roller, while performing the pressing rolling operation by the roller in the region separated from the bent base in the end region,
In the last pressing rolling operation by the above roller, the roller is pressed against the entire height of the end region and the pressing rolling operation by the roller is performed.
Roll, characterized in that also when any of the pressing rolling operation industry by the rollers, the angle portion between the cylindrical outer peripheral surface and the end surface of the roller to control the attitude of the roller so does not touch the end regions to become the flange portion Flange processing method. Of the above panel, the end area to be the flange part is left and the vicinity of the bent base of the end area is pressure-restrained from the front and back surfaces with the upper mold and the lower mold, and the end section is pressed by a roller. The roll flange processing method according to claim 1, wherein the region is bent downward . In the final pressing and rolling operation by the roller, the bent end region is pressed against the lower mold by the roller, and the end region is pressed and restrained by the lower mold and the roller to form a flange portion in a substantially upright posture. roll-flanging method according to claim 2, characterized in that to finish.

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