JP2949999B2 - Press bending method for composite parts - 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 press bending a composite part using a press machine.

[0002]

2. Description of the Related Art For example, a composite material having an assembled structure in which another small plate-like component, for example, a leaf spring is overlapped and joined by caulking or the like to a base material obtained by molding a plate material into a U-shape on both sides. In this case, the conventional manufacturing method generally employs a method in which a plate-shaped base material is independently bent into a predetermined three-dimensional shape using a press machine, and then another part is caulked to the base material and assembled.

However, in a method of bending a base material into a predetermined shape and then caulking and joining another part to the base material,
Since the base material is three-dimensionally formed, the joining process of the parts is complicated and troublesome. In particular, in the case of a composite component in which a plurality of components are allocated to different positions on the base material, the caulking process needs to be performed separately for each of the plurality of components, and the productivity is reduced. In this regard, if the parts are joined in a flat state before bending the base material, the work is much easier than in the above-described assembling method, and it is possible to caulk a plurality of parts to the base material at the same time. . Therefore, a method of joining different parts at a stage before bending the base material and then bending the base material with a press is being studied.

[0004]

By the way, the composite part obtained by joining the parts before bending the base material as described above is inserted into a press die (punch and die) of a press machine to perform the bending processing. In this state, the joint parts attached to the base material themselves are squeezed in the press mold, causing defects such as deformation of the parts and loosening of the joint (caulking part), resulting in a decrease in joint strength. Occur.

The present invention has been made in view of the above points, and an object of the present invention is to perform a slight processing in advance on the base material side so that another part can be overlapped before bending the flat base material. In this state, there is no danger of causing defects such as deformation and decrease in bonding strength.
It is an object of the present invention to provide a method for press-bending a composite component that enables a base material to be formed into a predetermined three-dimensional shape.

[0006]

SUMMARY OF THE INVENTION According to the present invention, a trapezoidal projection that is taller than a plate thickness of a component is formed on a component mounting surface of a base material in advance so as to avoid overlapping with a joining component. This is achieved by joining the parts to the base material and then inserting the parts into a press die to perform bending.

In carrying out the above method, a trapezoidal projection is formed to bulge in the component mounting surface area of the base material, and a notch is formed on the plate surface of the joint component so as to avoid overlapping with the trapezoidal projection. And press bending can be performed. As a method of forming the trapezoidal convex portion on the base material, there is a forming method by extrusion or burring.

[0008]

According to the above-mentioned bending method, since the joining parts previously joined to the base material are recessed one step from the end face of the trapezoidal projection, the base material is placed between the punch and the die of the press die. In the forming process of sandwiching and bending, the trapezoidal protrusion protruding from the joint part comes into contact with the press die and is squeezed. Therefore, no ironing force is directly applied to the joined parts attached to the base material in the press die, and defects such as deformation of the joined parts and looseness of the joined parts are reliably avoided.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on illustrated embodiments. First, FIG. 2 shows the entire structure of a composite part completed by press-bending a U-shape. In the drawing, 1 is a base material bent into a U-shape, and 1a is a base material as described later. 1, a trapezoidal projection bulging out on the component mounting surface;
Numeral 3 denotes a joining component such as a leaf spring, which is overlapped and crimped on both side surfaces of the base material 1, and 3 is a swaging portion of the joining component 2.

Next, a method of manufacturing the composite part shown in FIG. 2 will be described in the order of steps. First, as shown in FIG. 3 (a), the thickness of the joint component 2 is previously extruded or burred from the flat base material 1 punched into an H shape on the component mounting surfaces at both left and right ends. A trapezoidal projection 1a having a height H (H> d) higher than d is bulged. Reference numeral 3a denotes a caulking projection formed on the base material 1 for attaching a component. On the other hand, a notch hole 2a, which is slightly larger than the outer shape of the trapezoidal projection, is opened at a position corresponding to the trapezoidal projection 1a on the base material side of the joining component 2, and a caulking hole is formed at a location corresponding to the caulking projection 3a. 3b is perforated. Next, joining part 2
Is superimposed on the base material 1, and in this state, the part 2 is
We crimp and join. This intermediate assembly state is shown in FIG. As is apparent from FIG.
a protrudes from the notch hole 2a of the component 2.

Next, the intermediate assembly shown in FIG. 3B is inserted into a press die 4 as shown in FIG. In FIG. 1, reference numeral 4a denotes a die of the press die 4,
4b is a punch and 4c is a knockout. Here, the intermediate assembly of FIG. 3B is replaced with the die 4a and the punch 4b of FIG.
When pressed in between, the trapezoidal convex portion 1a comes into contact with the inner surface of the die of the press die and is squeezed, so that the part 2 retracted from the trapezoidal convex portion 1a and the caulked portion have some ironing force. Without receiving, the base material 1 is bent into a U-shape to complete the product of FIG.

[0012]

As described above, according to the bending method of the present invention, since a separate part is joined to a flat base material before the bending, the parts can be easily joined, and the press bending is performed. In such a case, the base material can be bent into a predetermined shape without applying an unreasonable force to the joined parts in the press die, and as a result, there is no defect such as deformation of the joined parts and decrease in joint strength. Can be manufactured by press bending with high productivity.

[Brief description of the drawings]

FIG. 1 is a diagram showing a process of press bending a composite part according to an embodiment of the present invention.

FIG. 2 is an external perspective view of a finished product of a composite part subjected to press bending.

FIGS. 3A and 3B are perspective views showing an intermediate assembly state of a composite part before press bending, in which FIG. 3A is a state view before a part is joined to a flat base material, and FIG. State diagram after joining

[Description of Signs] 1 Base material 1a Trapezoidal protrusion 2 Joining part 2a Notch hole 3 Swaged portion 3a Swaged protrusion 3b Swaged hole 4 Press mold

Claims (3)

(57) [Claims] 1. A method of press-bending a composite part in which another plate-shaped part is overlapped on a part of a plate-shaped base material and joined to form a predetermined three-dimensional shape, wherein the composite part is previously joined to a part mounting surface of the base material. Preventing overlapping with the part, forming a trapezoidal convex part taller than the plate thickness of the part in advance, and after joining the part to the base material, inserting it into a press die and performing bending. Press bending method for composite parts. 2. The press bending method according to claim 1, wherein the trapezoidal convex portion is formed so as to bulge in the component mounting surface area of the base material, and the plate surface of the joint component is prevented from overlapping with the trapezoidal convex portion. A press bending method for a composite part, wherein a notch for escape is formed. 3. The press bending method according to claim 1, wherein the trapezoidal convex portion is formed by extrusion and burring.