JP2001105056A - Hemming jig and hemming method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hemming jig and a hemming method capable of easily conducting high precision positioning of a material to be hemmed in a short time. SOLUTION: A roller guide face 1A arranged to a peripheral part of a hemming jig (jig hereunder) is formed at the position higher than a placing face of an outer 3 of a material to be hemmed, a positioning face 1B of a recessed face shape (circular arc shape), where a bending edge of the outer 3 is abutted, is formed on the inner peripheral face of the roller guide face 1A. The positioning face 1B is constructed so that a radiused part of bending edge of the outer 3 abutted on the positioning part is formed from the most lower end d to a position e of 60 deg. to 90 deg..

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hemming jig and a hemming method suitable for processing, for example, a bonnet flange of an automobile.

[0002]

2. Description of the Related Art Conventionally, a hemming apparatus and method for processing a hemmed material into a predetermined shape by rolling a hem roller along a bent edge of the hemmed material are disclosed in, for example, Japanese Patent Publication No. 5-34101 and Tokuhei 7-902
No. 99 and the like.

[0003] The hemming process will be described with reference to, for example, the processing of a hood flange of an automobile. As shown in FIG. 8, a hemmed material (outer 13) provided with a bent edge in advance is fixed to a predetermined portion of a hemming jig 11. This is a processing method of fixing the inner 12 and the outer 13 by fixing the inner 12 and the outer 13 by pressing the hem roller 14 (hereinafter referred to as a roller) along the bent edge of the material to be hemmed while abutting the hem roller.

[0004]

However, in the above-mentioned conventional processing method, in order to prevent the inner 12 and the outer 13 from moving due to the contact of the roller 14 and the rolling pressure, a method described below is generally used. Each has its own problem to be solved.

In other words, when a method is used in which a reference hole is provided in the outer 13 and a positioning pin is provided in the hemming jig 11, a hole is formed in the outer 13 before the hemming is actually performed. A process is required, which is an adverse effect on product cost reduction.

When a method of clamping the outer 13 placed on the hemming jig 11 by a positioning device is adopted, the roller 14 interferes with the clamped portion, so that the clamp position is changed. However, it is necessary to process all parts of the outer 13 to be hemmed in a plurality of times, and it is difficult to guarantee the positioning accuracy, and the time required for the processing cannot be shortened. This is an adverse effect on product cost reduction.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a hemming jig and a hemming method capable of easily and accurately positioning a hemmed material in a short time.

[0008]

In order to achieve the above object, a hemming jig and a hemming method according to the present invention have the following features.

That is, a hemming jig used when a hemmed material that has been bent in advance at a predetermined angle is placed and the bent edge thereof is hemmed using a roller. The roller guide surface provided on the peripheral portion of the tool is formed to a position higher than the mounting surface of the hemmed material, and the bent edge of the hemmed material is formed on the inner peripheral surface of the roller guide surface. It is characterized in that a positioning surface having a concave shape to contact is formed.

In the above-mentioned hemming jig structure, preferably, the height of the top of the roller guide surface is formed to be lower than the thickness of the processing portion after the completion of the processing of the hemmed material, and the concave surface is formed. The positioning surface of the shape
It is preferable to form the hemmed material in contact with the positioning surface from the lowermost end of the bent edge of the hemming material to a position of 60 to 90 degrees.

Alternatively, in order to achieve the above object, a hemming method according to the present invention has the following configuration.

[0012] That is, a hemming method using a hemming jig having the above-described structure, comprising: a mounting step of mounting the hemmed material on the hemming jig; A pre-bending step of pre-bending the bent edge to a predetermined angle by contacting and rolling the first roller along the first roller, and a second roller along the bent edge pre-bent to the predetermined angle. And a main bending step of fully bending the bent edge to a predetermined processing completion angle by abutting and rolling.

[0013] Further, for example, using a roller that can be used as the first and second rollers, the pre-bending step;
The main bending step is preferably performed continuously.

[0014]

According to the present invention, there is provided a hemming jig and a hemming method capable of easily and accurately positioning a material to be hemmed in a short time.

In other words, according to the first and fourth aspects of the present invention, high-precision positioning can be shortened only by bringing the bent edge of the hemmed material into contact with the concave positioning surface of the hemming jig. It can be done in time and easily.

According to the second aspect of the present invention, it is possible to prevent the top portion of the roller guide surface from being deformed by the roller, and to reliably process the hemmed material. .

According to the third aspect of the present invention, the bent edge of the hemmed material can be reliably brought into contact with the positioning surface of the hemming jig.

According to the fifth aspect of the present invention, hemming can be performed more efficiently in a shorter time.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a hemming jig and a hemming method according to the present invention will be described in detail with reference to the drawings as an embodiment applied to the processing of a bonnet flange of an automobile.

FIG. 1 is a diagram showing a cross section of a main part of a hemming jig according to the present embodiment and a contact state between the hemming jig and a hemmed material. FIG. 2 is a diagram showing an example of the overall shape of a hemming jig according to the present embodiment and a processing apparatus including an industrial robot equipped with hemming rollers.

In FIG. 1, a roller guide surface 1A provided on a peripheral portion of the hemming jig 1 is formed to a position higher than a mounting surface of an outer panel (hereinafter referred to as "outer") 3 as a material to be hemmed. At the same time, on the inner peripheral surface of the roller guide surface 1A, there is formed a concave-shaped (arc-shaped cross section) positioning surface 1B with which the bent edge (hemming flange) of the outer 3 abuts.

At the end of the outer 3, as shown by a broken line in the figure, a bent edge is formed in advance at a predetermined angle (approximately 90 degrees in the present embodiment) in another process, and from this state, it is shown in FIG. The inner panel (hereinafter referred to as “inner”) 2 shown by a solid line after the preliminary bending step and the main bending step by the roller 4.
The state after the completion of the hemming process in which the outer and the outer 3 are fixed is obtained.

The height of the top portion of the roller guide surface 1A prevents the top portion from being deformed by the roller 4 in the main bending step, and the height of the inner 2
In addition, in order to surely perform the hemming process on the outer 3, it is preferable that the thickness be lower than the thickness H of the processed portion after the processing of the outer 3 is completed.

The concave positioning surface 1B is
In order to ensure that the bent edge of the outer jig 1 abuts on the positioning surface of the hemming jig 1, the R portion of the bent edge of the outer 3 that abuts on the positioning surface has a position e 60 to 90 degrees from its lowermost end d. Is formed up to.

At the peripheral edge of the hemming jig 1 having the overall shape (a shape corresponding to the shape of the outer 3) illustrated in FIG. 2, the roller guide surface 1 described with reference to FIG.
A and the location where the structure of the positioning surface 1B of the inner peripheral surface thereof is to be adopted are, for example, if the outer 3 has a quadrangular shape having four sides, in order to prevent the displacement of the outer 3 due to the roller 4 rolling. It is sufficient to adopt at least two opposed sides having the bent edges. However, from the relationship between the hardness of the material of the outer 3 and the total weight, if the weight is sufficiently large, the outer 3 is attached to the hemming jig 1 in the mounting step. The above structure may be employed only for positioning the object with high accuracy.

Here, a procedure for hemming the inner 2 and the outer 3 using the hemming jig having the above structure and the roller 4 mounted on the robot 5 will be described.

Step 1: First, the outer 3 having the bent edges formed in advance is mounted on a hemming jig 1 as shown in FIG. 1 by using a general transfer device (not shown). The inner 2 is placed on the placed outer 3. At this time, it is preferable to use the bent edge of the outer 3 for positioning the inner 2.

Step 2: Next, by utilizing the roller guide surface 1A of the hemming jig 1, the roller 4 is pressed and rolled along the bent edge of the outer 3 as shown by a broken line in FIG. The bending edge is preliminarily bent to a predetermined angle.

Step 3: Next, as shown by a solid line in FIG. 3, the direction of the rotation axis of the roller 4 is changed, and the roller 4 is brought into contact with the roller 4 along the bent edge preliminarily bent to a predetermined angle in Step 2, and rolled. By pressing, the bent edge,
The main bending is performed to a predetermined processing completion angle at which the inner 2 is fixed by the bent edge of the outer 3.

As described above, according to the above-described embodiment, the bent edge of the outer 3 can be positioned on the positioning surface 1B of the hemming jig 1 without using a clamping device required in the conventional hemming. , Positioning can be performed easily and with high precision in a short time.
Thereby, the manufacturing cost of the product can be reduced.

In the above-described embodiment, the same roller 4 is used in the pre-bending step and the main bending step.
In those steps, separate processing rollers may be used.

<Modification of Embodiment> FIG. 4 is a view showing a processing roller according to a modification of the present embodiment, which is suitable for use when a so-called bead is formed on the bent edge of the outer 3. 3 shows a processing roller.

The roller 6 shown in FIG. 3 is formed so as to form a bead in the main bending step, while abutting the guide roller portion contacting the roller guide surface 1A and the bent edge of the outer 3 to form a bead. A roller portion for rolling from the pre-bending state to the main bending state is provided, and a groove portion is provided between the two types of roller portions to form a bead.

Since the roller 6 has the above-mentioned shape, it is placed on the hemming jig 1 where the inner 2 and the outer 3 are not placed as shown in FIG. Even if the roller 6 is run, it is possible to prevent the top portion of the roller guide surface 1A from being deformed by the roller.

The roller 6 can be used exclusively for the main bending step, or in the preliminary bending step, the guide roller portion of the roller 6 is brought into contact with the roller guide surface 1A as shown in FIG. This may be used in both the preliminary bending step and the main bending step.

Also, in the hemming process shown in FIG. 1 in which no bead is formed, when the same roller is used in the pre-bending step and the main bending step, the operable range of the arm of the robot 5 and the interference of the surroundings are reduced. If the two processes cannot be performed by the roller 4 due to the relationship with the object, the roller 7 having the same guide roller portion as the roller 6
(See FIG. 7), the preliminary bending step and the main bending step may be performed.

[Brief description of the drawings]

FIG. 1 is a diagram showing a cross section of a main part of a hemming jig according to the present embodiment and a state of contact with a hemmed material.

FIG. 2 is a diagram showing an example of the overall shape of a hemming jig according to the present embodiment and a processing apparatus including a robot equipped with hemming rollers.

FIG. 3 is a diagram for explaining the behavior of a roller during hemming using a hemming jig according to the embodiment.

FIG. 4 is a view showing a roller for forming a bead in a modification of the present embodiment.

FIG. 5 is a diagram illustrating characteristics of a bead forming roller according to a modified example of the embodiment.

FIG. 6 is a diagram illustrating a case where a preliminary bending step is performed using a bead forming roller according to a modified example of the embodiment.

FIG. 7 is a diagram illustrating an outer shape of a roller that can be shared in a preliminary bending step and a main bending step in a modification of the present embodiment.

FIG. 8 is a diagram illustrating a conventional hemming jig and hemming method.

[Explanation of symbols]

 1,11: hemming jig, 2,12: inner, 3,13: outer, 4,6,7,14: roller, 5: robot,

Claims (5)

[Claims] 1. A hemming jig for use when a hemmed material that has been bent in advance at a predetermined angle is placed thereon and the bent edge thereof is hemmed using a roller. The roller guide surface provided on the peripheral portion of the tool is formed to a position higher than the mounting surface of the hemmed material, and the bent edge of the hemmed material is formed on the inner peripheral surface of the roller guide surface. A hemming jig characterized by having a concave positioning surface that is in contact therewith. 2. The hemming jig according to claim 1, wherein a height of a top portion of the roller guide surface is lower than a thickness of a processing portion after the processing of the hemmed material is completed. 3. The concave positioning surface is formed from the lowermost end of the bent edge of the hemmed material abutting the positioning surface to a position 60 to 90 degrees. 1. The hemming jig according to 1. 4. A hemming method using the hemming jig according to claim 1, wherein: a mounting step of mounting the hemmed material on the hemming jig; A pre-bending step of pre-bending the bent edge to a predetermined angle by abutting and rolling the first roller along the first roller, and a second roller along the bent edge pre-bent to the predetermined angle. A hemming process, comprising: a final bending step of fully bending the bent edge to a predetermined processing completion angle by abutting and rolling. 5. The hemming process according to claim 4, wherein the pre-bending step and the main bending step are continuously performed using a roller that can be used as the first and second rollers. Method.