JP2500675B2 - METHOD FOR MOLDING HAT-TYPE PRODUCT HAVING EAR FLANGE AND FORMING MOLD - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for molding a hat-shaped product having an ear flange and a molding die used for the molding.

[0002]

2. Description of the Related Art Conventionally, as a molding die which is attached to a press machine or the like and is used to bend a material to form a hat-shaped product, there is one disclosed in Japanese Utility Model Laid-Open No. 62-29818.

By the way, in the case of molding a hat-shaped product A having an ear flange A1 at its end like the hat-shaped product A shown in FIG. 3, conventionally, for example, a molding die 1 as shown in FIG. 6 has been used. This is composed of a pair of upper die curved blades 2 mounted in parallel to an upper die (not shown) and a lower die blade 3 having a convex cross section attached to a lower die (not shown), The lower die curving blade 3 is provided with a rising surface 5 for cooperating with the end surface 4 of the upper die curving blade 2 to bend the forming portion a1 of the ear flange formed on the material a. Incidentally, reference numeral 6 in the drawing denotes a pad having a spring or the like built therein, which serves to hold down the material a during processing.

In the molding die 1 of this structure, as shown in FIG. 6, when the material a is placed on the upper surface of the lower die blade 3, the upper die blade 2 is lowered, and when Material a
The pad 6 presses the material a to prevent the slippage of the material.
Subsequently, the upper die curved blade 2 cooperates with the lower die curved blade 3 to form the material a into a hat shape, and at the same time, by the end surface 4 of the upper die curved blade 2 and the rising surface 5 of the lower die curved blade 3. The forming portion a1 of the ear flange of the material a is bent to form the ear flange A1.

[0005]

However, in the forming method using the forming die 1, the end surface 4 of the upper bending blade 2 and the rising surface of the lower bending blade 3 are bent when the forming portion a1 of the edge flange of the material a is bent. Since the molding portion a1 is dragged into the narrow gap between the molding portion 5 and the molding portion 5 and a large frictional force in the pulling direction is applied to the molding portion, the portion a1 may be torn to cause defective molding.

Therefore, in order to avoid the occurrence of such defective molding, as shown in FIG. 4, a bending step for forming an ear flange on the material a (a step shown in FIG. 4B) and a bending step for forming a hat shape. Forming is performed separately from the process (the process of (c) in FIG. 4), or as shown in FIG. 5, a process of forming a hat shape on the material a and slightly bending the ear flange (FIG. 5 (b)). Method) and a step of bending the ear flange at a regular angle (step of FIG. 5C) have been proposed, but if molding is performed in multiple steps like this, However, not only a plurality of presses are required, but also a plurality of types of molding dies are required, which increases the equipment cost and requires a large installation space.

The present invention has been made in view of the above problems. An object of the present invention is to form a hat-shaped material in one step (one stroke of a press machine) without causing defective molding. It is an object of the present invention to provide a molding method and a molding die capable of performing molding and molding of an ear flange.

[0008]

In order to achieve the above object, a forming method according to the present invention is such that an upper die is lowered to form a hat shape on a material with an upper die curved blade and a lower die curved blade. The material is moved toward the ear flange forming surface of the material, which is formed by forming a movable curved blade on at least one of the upper mold curved blade and the lower mold curved blade according to the lowering of the upper mold. The forming of the ear flange with respect to the forming portion of the ear flange is started, and the formation of the hat shape and the forming of the ear flange are completed at the bottom dead center of the upper die.

Further, the forming die according to the present invention is provided on the upper die curved blade and the lower die provided on the upper die, and cooperates with the upper die curved blade to form the material into a hat shape. A lower curved blade and a movable flange provided on at least one of the upper curved blade and the lower curved blade so as to be movable in a direction intersecting with an ear flange molding surface, and the ear flange molded surface is interlocked with the upper mold. And a movable curved blade that moves toward.

In the molding die according to the present invention, one of the upper mold blade and the lower mold blade has a concave cross-section and the other has a convex cross-section, and the material is sandwiched between them to be fitted. A hat shape can be formed. Also,
The end surface of the upper or lower curved blade with a concave cross-section is used as the ear flange molding surface, and the movable curved blade presses the molding portion of the material's ear flange against this ear flange molding surface to mold the ear flange. Can be allowed to.

When the lower die curved blade has a convex cross-section, the end of the lower die is projected in the direction of the movable curved blade from the end surface of the upper die (formation of the edge flange), and the movable curved blade is moved to the lower die. It is advisable to move along the protruding portion of the curved blade. In this case, one movable curved blade may be provided on each side of the protruding portion of the lower mold blade, or one movable curved blade may be provided across the protruding portion.

Further, by providing a passive cam on the upper die, forming a cam surface on each of the passive cam and the movable curved blade, and sliding the cam surfaces, the movable curved blade is interlocked with the upper die. It can be moved smoothly. The movable curved blade is usually provided in the lower mold, but it may be provided in the upper mold in some cases.

[0013]

In the molding method using the molding die of the present invention,
Following the start of hat-shaped molding with the upper and lower curved blades, the movable curved blade moves toward the ear flange molding surface of the upper or lower curved blades, and the machining gap of the ear flange is reduced. The ear flanges are gradually closed to form the ear flanges, so that no frictional force in the pulling direction is applied from the curved blades to the ear flange forming portion of the material.

[0014]

Next, an embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 1, an upper die 8 is attached to the lower surface of a ram 7 of the press machine. The upper die 8 has a pair of upper die curved blades 9 arranged in parallel with each other. Passive cam 1 to describe
0 and are attached.

On the other hand, the lower die (not shown) has a lower die curved blade 11
Is attached, and the lower curved blade 11 is formed in a convex shape in cross section, and the pair of upper curved blades 9 with the material a sandwiched therebetween.
The size is such that it can be fitted in between. And
In the case of this embodiment, the lower curved blade 11 has a lubricating plate 12
A movable curved blade 13 is provided via the.

As shown in FIG. 2, the end portion 1 of the lower mold cutting blade 11 is formed.
4 is arranged so as to project from the end surface 15 of the upper mold bending blade 9 that is the edge flange molding surface toward the movable bending blade 13 side, and the movable bending blade 13 extends along the protruding end portion 14 of the lower mold bending blade 11. It is said that it can be moved.

The movable curved blade 13 has a tapered cam surface 16
The cam surface 16 is formed, and the cam surface 17 formed on the passive cam 10 attached to the upper die 8 is in sliding contact with the cam surface 16. As the upper die 8 descends, the cam surface 17 of the passive cam 10 moves the movable curved blade 13
By sliding on the cam surface 16 of the movable curved blade 13 of the upper die 9
To the end face 15 (leftward in FIG. 1). The movable curved blade 13 is provided with a biasing means such as a spring (not shown), and when the passive cam 10 is not in contact with the movable curved blade 13, the material a is returned to a position where it is not processed (position shown by a solid line in FIG. 1). ing. This returning position is a position where the end surface of the movable curved blade 13 is separated from the end surface 15 of the upper die curved blade 9 which is the edge flange molding surface by a predetermined machining gap (P dimension in FIG. 1). The gap P is set to be slightly narrower than the width of the molding portion a1 of the ear flange of the material a (dimension l in FIG. 4 (a)), so that the molding portion a of the ear flange is surely formed during molding.
1 is bent to the outside.

In FIG. 2, reference numeral 18 denotes a pad for pressing the material a during processing, which is urged downward by an urging means such as a spring (not shown).

The molding method using the above mold will be described below. In advance, the material a on which the forming portion a1 of the ear flange has been formed by punching is placed on the lower curved blade 11 (the position indicated by the alternate long and short dash line in FIG. 2). Then, when the upper die 8 is lowered, first, the pad 18 presses the material a so that it does not shift during processing, and then the upper die curving blade 9 is fitted to the lower die curving blade 11 to the material a. Start forming the hat shape. When the lower die 8 continues to descend, the cam surface 17 of the passive cam 10 attached to the upper die 8 is moved to the cam surface 1 of the movable curved blade 13.
6 is slidable, and the movable curved blade 1 is moved toward the end surface 15 of the upper mold curved blade 9.
Move 3 As a result, the processing gap P of the ear flange is
Is gradually narrowed, and the molding portion a1 of the ear flange of the material a is
Is gradually bent. Then, at the bottom dead center of the upper die 8, the hat-shaped molding and the ear flange A1 molding of the material a are completed, and the material a is molded into a regular product shape (state of two-dot chain line in FIG. 2).

As described above, the molding portion a1 of the ear flange of the material a is gradually bent by the movable curved blade 13, and the upper die 8
At the bottom dead center of, since it is sandwiched between the upper mold blade 9 and the movable curved blade 13 to be formed into a regular shape, when it is bent from the upper mold blade 9 and the movable curved blade 13, the frictional force in the pulling direction is reduced. Never receive. Therefore, molding defects such as tearing of the ear flange do not occur.

In the above embodiment, a pair of upper die curved blades 9 is used.
Are arranged in parallel with each other and the lower die curved blade 11 has a convex cross-section, but the present invention is only required to form a hat shape on the material a with the upper die curved blade and the lower die curved blade. The shape of the lower curved blade can be reversed from the above.

[0023]

As described in detail above, according to the molding method and the molding die of the present invention, the movable curved blade moves toward the ear flange molding surface of the upper curved blade or the lower curved blade. Then
Forming the ear flange by gradually closing the processing gap of the ear flange prevents frictional force in the pulling direction from being applied from each curved blade to the forming part of the ear flange of the material, and prevents the occurrence of molding defects such as tears. To be done. In addition, since the hat shape and the ear flange can be formed on the material in one step (one stroke of the press machine), the press machine and the forming die can be used as compared with the conventional case of forming in a plurality of steps. One is sufficient, the equipment cost can be significantly reduced, the operating cost of the press machine can be reduced, and further, since a small installation space is required, the molding line can be effectively used.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a mold according to an embodiment of the present invention.

2 is a perspective view of the molding die shown in FIG. 1. FIG.

FIG. 3 is a perspective view showing an example of a hat-shaped product having an ear flange molded by the molding die of the present invention.

FIG. 4 is a perspective view showing a shape of a raw material in each step when a hat-shaped product having an ear flange is formed by a plurality of conventional steps.

FIG. 5 is a perspective view showing a shape of a material for each process in another case of forming a hat-shaped product having an ear flange in a plurality of conventional processes.

FIG. 6 is a perspective view showing an example of a conventional molding die.

[Explanation of symbols]

 8 Mold 9 Upper curved blade 10 Passive cam 11 Lower curved blade 13 Movable curved blade 15 End surface of upper curved blade (ear flange molding surface) a Material a1 Ear flange molding part

Claims (2)

(57) [Claims] 1. A lower die is lowered to start forming a hat shape for a material with an upper curved blade and a lower curved blade, and subsequently, a movable curved blade is moved to the upper curved blade according to the lowering of the upper die. Or, moving toward the ear flange forming surface of the material formed on at least one of the lower die curved blades to start forming the ear flange with respect to the forming portion of the ear flange of the material, and the bottom dead center of the upper die. 2. The method for forming a hat-shaped product having an ear flange, wherein the forming of the hat shape and the forming of the ear flange are completed. 2. An upper die curving blade provided on the upper die, a lower die curving blade provided on the lower die for forming a material into a hat shape in cooperation with the upper die curving blade, and the upper die curving blade. A movable curved blade that is provided movably in a direction intersecting the edge flange forming surface formed on at least one of the blade or the lower die curved blade, and moves toward the edge flange forming surface in conjunction with the upper die, A hat-shaped product forming die having an ear flange, which is characterized in that: