JP2527604B2 - Mold equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a mold apparatus, and more specifically, a work, for example, a thin plate-shaped steel material, is bent at an edge thereof using a set of molds. At this time, one die is provided with a first bending means for bending the steel material, and the other die is equipped with the second bending means and the pressing member to relatively displace each other die. By doing so, the present invention relates to a die device capable of bending the steel material into a substantially triangular cross section under the cooperation of the first bending means, the second bending means, and the pressing member.

BACKGROUND OF THE INVENTION Conventionally, a thin plate-like work such as an automobile hood, a door and a trunk lid, for example, as a method of bending an edge portion of a steel material, after bending the edge portion of the steel material to approximately 90 °,
Processing methods such as flat hemming, which is bent at a predetermined angle and folded in two until they come into contact with each other, and looped hemming, which is bent by rounding the edge of a steel material, are generally used.

However, in the looped hemming process,
Since the edge of the steel material is bent with a roundness, the bending line is not clear, and there is a problem that the contact area is small and the adhesion is poor. Therefore, when the edge portion of the steel material is bent by the flat hemming, work hardening often occurs when the steel material bent at about 90 ° is bent at a predetermined angle. 2 more steel materials that have undergone this work hardening
When bending is attempted until it is folded, distortion occurs on the processed surface, and a curved and unclear bending line is formed. Therefore, a step of correcting the curved bending line into a clear bending line is required as a step of removing this distortion.

By the way, a technical idea for preventing the occurrence of work hardening when bending a steel material is disclosed in, for example, Japanese Patent Publication No. 63-
No. 2690. This idea prevents the occurrence of work hardening in the process of bending the steel material to about 90 °,
Work hardening also occurs in the subsequent steps. After all, even if the flat hemming process is performed by adopting this technical idea, distortion occurs in the processed surface, and a step of removing the distortion is required as in the above. Therefore, the work becomes complicated, and the work time becomes long, so that it is practically difficult to further improve the production efficiency.

[Object of the Invention] The present invention has been made in order to overcome the above-mentioned inconvenience, and a first bending means for bending a work is attached to one die, and a pressing member is attached to the other die. And second bending means are arranged, and the molds are relatively displaced to bend the edge of the work piece at a predetermined angle through the first bending means, and then the pressing member is used. It is configured to perform delta hemming with a substantially triangular cross-section in one step while controlling the pressure of the work, thereby preventing the occurrence of work hardening and forming a sharp bending line that does not cause distortion, and An object of the present invention is to provide a mold device that can shorten the time and improve the efficiency of bending work.

[Means for Achieving the Object] In order to achieve the above-mentioned object, the present invention is a mold apparatus for performing a delta hemming process on a work end part which is bent in a substantially right angle in advance. A second die facing the first die, a first yoke swingably provided on the first die, a first bending means provided on the first yoke, the second die A second yoke swingably provided on the mold, a pressing member provided on the second yoke, and a second bending means provided on the second yoke, wherein the second bending means is The first yoke has a first surface and a second surface inclined by a predetermined angle with respect to the first surface.
The bending means is oscillated and displaced, and the first bending means is the first bending means.
The end of the work placed on the mold is bent and bent, and the pressing member presses and holds the work in accordance with the displacement operation of the one die, and presses the work in a direction orthogonal to the displacement operation. Simultaneously with the sliding, the second yoke swings and displaces the second bending means in accordance with the displacement operation of the one die, and the second bending means causes the first surface and the second surface of the second bending means to move to the work end portion. Characterized by delta hemming.

[Embodiment] Next, a mold apparatus according to the present invention will be described in detail below with reference to preferred embodiments, with reference to the accompanying drawings.

In FIG. 1, reference numeral 10 indicates a mold apparatus according to the present invention, the mold apparatus 10 is disposed above a lower mold 12 and the lower mold 12, and an arrow A ₁ is provided through a cylinder (not shown). , And an upper mold 14 that is displaced in the A ₂ direction. The lower die 12 has a bending die.
16 and a cam die 18 are formed, and a concave portion, that is, a space portion 20 is defined between them. This bending die 16 has a vertical surface
It has 16a and a horizontal surface 16b, and a work, that is, an outer plate member 22 and an inner plate member 24 as steel materials can be placed on the horizontal surface 16b. A grooved cam 26 is provided on the upper portion of the cam die 18 so as to be inclined. Also, in the space section 20, the lower mold
The support base 28 is disposed on the first support 12, and the first support is provided via the hinge member 30.
Yoke 32 of is attached so as to be swingable in the directions of arrows B ₁ and B ₂ . The first yoke 32 has a cam roller 34 at one end thereof,
A first bending means, for example, a first bending punch 36 is attached to the other end. In addition, the first yoke 32 and the cam die 18
A coil spring 38 for tensioning is interposed between the first yoke 32 and the coil spring 38, and the first yoke 32 is always moved to the arrow B ₂
Is pulled in the direction.

On the other hand, the mounting base 40 is fixed to the upper mold 14 and the second yoke
42 is suspended via links 44a, 44b, thus
The second yoke 42 is connected to the arrows C ₁ , C ₂ by the links 44a, 44b.
It can be displaced in any direction. At this time, the arrow C ₂ of the second yoke 42
A stopper 46 is provided on the mounting base 40 so as to prevent unnecessary displacement in the direction.

At one end of the second yoke 42, a cam roller 48 is provided with a cam die 18
It is arranged so that the grooved cam 26 provided in the roller can roll. In addition, a second space defining a space 50 is formed at the other end of the second yoke 42.
, A second bending punch 52 is fixed,
The second bending punch 52 has a horizontal surface (first surface) 52a and an inclined surface (second surface) 52b which is inclined at a predetermined angle with respect to the horizontal surface 52a.
And A pressing member in the space 50, for example, a presser foot
54 are held via bolts 56. A coil spring 58 is mounted on the bolt 56 so that the presser foot 54 is constantly pressed downward.

A cam driver 60 is attached to the mounting base 40, and a bending cam 62 is provided at the tip of the cam driver 60. The bending cam 62 is formed with inclined surfaces 62a and 62b and a vertical surface 62c, and the bending cam 62 faces the cam roller 34.

Further, a bending member 64 is provided in the upper mold 14 in the vicinity of the mounting base 40, and the inner plate member attached to the mounting plate 65 is attached to the bending member 64.
A pad 66 corresponding to the shape of 24 is held via a hanging bolt 68. A coil spring 70 is mounted on the suspension bolt 68 to constantly push the pad 66 attached to the mounting plate 65 downward.

The mold apparatus according to the present invention is basically constructed as described above. Next, its operation and effect will be described.

First, the vertical surface 16a and the horizontal surface 16b formed on the bending die 16 are formed.
After arranging the outer plate member 22 bent at about 90 ° so as to contact with, the inner plate member 24 is placed on the outer plate member 22, and then,
When a cylinder (not shown) is driven to displace the upper mold 14 downward in the direction of arrow A ₁ , a pad corresponding to the shape of the inner plate member 24 is formed.
66 presses and positions the inner plate member 24. That is, the inner plate member 24 is pressed by the elastic force of the coil spring 70. Further, when the upper die 14 is displaced downward in the direction of the arrow A ₁ , the cam roller 48 provided on the second yoke 42 contacts the grooved cam 26, and at the same time, the presser foot 54 contacts the inner plate member 24. When the cam roller 48 rolls on the grooved cam 26, the second
The yoke 42 is displaced in the arrow C ₁ direction via the links 44a and 44b, and the presser foot 54 moves in the arrow C ₁ direction while pressing the inner plate member 24 against the elastic force of the coil spring 58 accordingly. To do. After that, when the cam roller 34 disposed on the first yoke 32 comes into contact with the inclined surface 62a of the bending cam 62 and then rolls from the inclined surface 62a to the vertical surface 62c, the first yoke 32 pulls the tension force of the coil spring 38. Swing in the direction of arrow B ₁ against. That is, the first bending punch 36 attached to the first yoke 32 is indicated by the arrow.
The edge of the outer plate member 22 is bent at a predetermined angle by swinging in the B ₁ direction (see FIG. 2).

Further, when the upper die 14 is displaced downward in the direction of the arrow A ₁ , the cam roller 34 rolls from the vertical surface 62c to the inclined surface 62b.
As a result, the first yoke 32 is displaced in the direction of arrow B ₂ via the tensile force of the coil spring 38, and the first bending punch 36 retracts from the outer plate member 22. Thereafter, the cam roller 48 rolls the grooved cam 26 diagonally downward, whereby the second yoke 42 is displaced in the directions of the arrows C ₁ and A ₁ . That is, the presser foot 54 is displaced in the direction of arrow C ₁ to regulate the pressure on the surface of the outer plate member 22 bent at a predetermined angle, and at the same time, to bend the second bending punch.
52 presses the edge of the outer plate member 22 from above with a predetermined pressure on the horizontal plane 52.
By bending into a shape corresponding to a and the inclined surface 52b, delta hemming with a substantially triangular cross section is completed (see a and b in FIG. 3).

On the other hand, when by driving the cylinder (not shown) to raise the upper die 14 in the arrow A ₂ direction when performing mold opening, first, by the cam roller 48 rolls on the grooved cam 26 in the opposite direction 2 The bending punch 52 rises. Then, the first yoke 32
The cam roller 34 of the bending cam 62 from the inclined surface 62b to the vertical surface 62c.
To roll. At that time, the first yoke 32 is a coil spring.
When the cam roller 34 oscillates in the direction of arrow B ₁ against the tensile force of 38 and the cam roller 34 rolls from the vertical surface 62c to the inclined surface 62a, the first yoke 32 moves in the direction of arrow B ₂ by the tensile force of the coil spring 38. Rock. After that, when the cam roller 48 further rolls the grooved cam 26 diagonally upward, the second yoke 42 rises and the arrow
Simultaneously with the displacement in the C ₂ direction, the presser foot 54 presses the inner plate member 24 by the pressing force of the coil spring 58, and the arrow C ₂
Move in the direction. When the cam roller 48 separates from the grooved cam 26, the presser foot 54 also separates from the inner plate member 24, and when the link 44a abuts the stopper 46, the displacement of the second yoke 42 in the arrow C ₂ direction stops.

Further, the upper die 14 is displaced upward in the direction of the arrow A ₂ , and after the tip of the hanging bolt 68 reaches the bending member 64, the pad 66
Is separated from the inner plate member 24, and the upper mold 14 rises to a predetermined position. Next, the cylinder (not shown) is stopped and the mold opening is completed.

In this case, according to the present embodiment, the first yoke 32 of the first
Outer plate member bent in advance to 90 ° by bending punch 36
22 is once bent to a predetermined angle. Thereafter, the first bending punch 36 retracts and the presser foot 54 of the second yoke 42 is used to move the inner plate member.
A predetermined pressure is applied to the second bending punch 52 from above while the pressure of 24 is regulated in the direction of arrow C _1, and the outer plate member 22 is finally subjected to delta hemming having a substantially triangular cross section.
Therefore, a sharp bending line is formed on the outer plate member 22 without causing distortion on the processed surface, and the strength of the edge portion of the outer plate member 22 is improved as compared with the conventional flat hemming process. It becomes possible.

In addition, in this embodiment, the second yoke 42 is linked.
I attached it to the mount 40 via 44a and 44b,
Instead of 4b, a slide mechanism or the like can be adopted and attached to the mounting base 40. It is also possible to dispose the second bending punch 52 on the lower die 12 so as to be able to move up and down and to provide the groove cam 26 on the upper die 14.

Further, before pressing and fixing the inner plate member 24 with the presser foot 54, the edge portion of the outer plate member 22 is bent at a predetermined angle through the first bending punch 36, and then the presser foot 54 is attached. It is also possible to press 24 to perform delta hemming.

[Effects of the Invention] As described above, according to the present invention, one die is provided with the first yoke for attaching the first bending means, and the other die is provided with the pressing member and the second bending means. The second yoke is provided so as to be displaceable in the lateral direction. Therefore, the edges of the steel materials bent in advance by 90 ° by relatively displacing the molds are once bent through the first bending means to a predetermined angle, and then the second yoke is operated. The delta hemming process having a substantially triangular cross section is performed in one step while controlling the pressure from above and from the side. Therefore, it is possible to prevent the occurrence of work hardening on the edge of the steel material, and to form a clear bending line without distortion on the processed surface. Further, there is an effect that the strength of the steel material can be improved and the working time can be shortened to improve the working efficiency.

Although the present invention has been described above with reference to the preferred embodiments, the present invention is not limited to these embodiments, and various improvements and design changes can be made without departing from the scope of the present invention. Of course.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a vertical cross-sectional explanatory view showing a state in which an upper mold forming a mold device according to the present invention is separated from a lower mold, and FIG. 2 shows a mold device according to the present invention. Fig. 3a is a vertical cross sectional view showing a state in which the mold is engaged with the lower mold, Fig. 3a is a vertical cross sectional view in which the upper mold shown in Fig. 2 is further lowered, and is in delta hemming. FIG. 3 is an enlarged vertical sectional view of a main part of FIG. 10 ... Mold device, 12 ... Lower mold, 14 ... Upper mold, 22 ... Outer plate member 24 ... Inner plate member, 32 ... First yoke 36 ... First bending punch, 42 ... Second yoke 52 ... Second bending punch , 52a ... Horizontal surface 52b ... Inclined surface, 54 ... Presser foot

Claims (1)

(57) [Claims] 1. A mold device for performing a delta hemming process on a work end part which is bent in a substantially right angle in advance, comprising: a first mold; a second mold facing the first mold; and a second mold. A first yoke swingably provided on a first die; a first bending means provided on the first yoke; a second yoke swingably provided on the second die; A second bending means provided on the second yoke, and a second bending means provided on the second yoke. The second bending means includes a first surface and a second surface that is inclined at a predetermined angle with respect to the first surface. The first bending means swingably displaces in accordance with the displacement operation of one of the molds, and the first bending means is mounted on the first mold. The end of the work is pressed and bent, and the pressing member presses and holds the work as the one die moves. At the same time as the second yoke slides on the workpiece in a direction orthogonal to the displacement operation, the second yoke swings and displaces the second bending means in accordance with the displacement operation of the one die, and A die apparatus characterized in that a delta hemming process is performed on a work end portion by a first surface and a second surface.