JPS6293033A - Repressing method for press work and its working device - Google Patents

Abstract

PURPOSE:To secure the quality of a product and to reduce the cost as well by bending a work with the bending blade fixed to the upper die and by forming the work by its drawing with restraining it by a fixed punch as well. CONSTITUTION:The wheel arch part and its peripheral side of a fender panel 3A are held by the upper die 8 and cushion pad 6 and according to the descent of the upper die 8 formed gradually by the end face 92 of a bending blade 9 and fixed punch 4. According to further descent of the upper die 8, the bending blade 9 bends the flange part and this bending is performed by drawing like 3C in the state of restraining the flange part over the whole periphery in the optimum clearance between the end face 92 of the bending blade 9 and the side face 48 of the fixed punch 4. A drawing bending is performed by drawing cam work by descending the upper die 8 further.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a method for re-pressing a pressed product and a processing apparatus therefor, and in particular a method for re-pressing an automobile fender panel that has already been manufactured by pressing. The present invention relates to a method for processing an over fender panel in which the design shape of the wheel arch portion and its surroundings is partially changed, and to improvements in the processing equipment.

[Conventional technology]

In a component generally referred to as an over fender, the wheel arch portion of the fender panel may be a separate part or may be integrated.

In the case of the latter over fender panel, the aperture shape of the wheel arch portion, the design shape of the surrounding area, the product separation, etc. are significantly different from those of the fender panel.

For this reason, in order to manufacture these over fender panels and fender panels, conventionally, 5 to 6 dedicated press dies were used to draw, punch, bend, etc.
I needed a mold.

This is because, in the conventional technology, sufficient quality cannot be ensured in the finished product by re-pressing the pressed product.

Furthermore, conventionally, in a press apparatus, a driving means separate from the driving means for moving the paired molds toward and away from each other is provided in a press apparatus, and this driving means drives a slide unit having a punch, A technique is disclosed in which a workpiece held between molds is molded or drilled.

[Problem that the invention seeks to solve]

However, the conventional re-pressing method has the problem of not ensuring sufficient product quality, and the method of separately processing two types of parts requires many dedicated molds and processes, which increases manufacturing and product costs. There was a problem.

Therefore, an object of the present invention is to provide a re-pressing method and a processing apparatus therefor, which can sufficiently ensure product quality and reduce manufacturing costs.

[Means for Solving the Problems] For this reason, the re-pressing method of a pressed product and its processing apparatus according to the present invention are such that tension forming is performed under certain constraint conditions in the forming process by re-pressing a pressed product. It is characterized by having a structure that can be properly carried out below.

Specifically, the first invention according to the present invention bends a press-formed product with a bending blade fixed to an upper die, and
This is a re-pressing method for a press-formed product, characterized in that the press-formed product is tensile-formed while being restrained by the bending blade and a fixed punch fixed to the lower die.

Further, a second invention according to the present invention is a re-pressing of a press-formed product consisting of a fixed punch fixed to a lower mold and an upper mold, in which a new press-formed product is processed by re-pressing a press-formed product. In the processing apparatus, a bending blade for bending the press-worked product is fixed to the upper mold.

[Effect]

To explain the operation of the present invention according to the above configuration, taking as an example a case where a pressed fender panel is processed into an over fender panel by re-pressing, the end of the fender panel is first bent with a bending blade fixed to an upper mold. Bending is performed, and the edges of the fender panel are tension-formed without being restrained using a bending blade and a fixed punch fixed to the lower die. This state is shown in FIG. 5(A).

Then, the edges of the formed fender panel are further bent. This state is shown in FIG. 5(B).

After that, the edges of the fender panel are bent together using a shifting cam process. This state is shown in FIG. 5(C).

In this way, the over fender panel is completed.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

Fig. 1 is a sectional view showing the re-press molding process of a press-formed product according to the present invention together with its processing equipment, Fig. 2 is a perspective view of a fender panel, Fig. 3 is a perspective view of an over fender panel, and Fig. 4 is a Line 1-I in Figure 2 and IV in Figure 3
FIG. 5 is a cross-sectional view taken along the line -IV, and is a cross-sectional view schematically showing the process sequence for processing a fender panel into an over fender panel.

A re-press processing apparatus (hereinafter simply referred to as a re-press processing apparatus) 1 for press-processed products includes a lower mold 2, a fixed punch 4,
It is composed of a cushion pad 6, an upper die 8 and a bending blade 9.

The lower mold 2 has a flat plate shape, and a fixed punch 4 constituting a mold for molding is fixed thereon.

The fixed punch 4 has a columnar shape, and a lower mold surface 42 for molding is formed on the upper surface.

A cushion pad 6 is arranged adjacent to the fixed punch 4. The cushion pad 6 has a shape corresponding to the surface shape of the press-formed product (hereinafter referred to as a workpiece) 3A on which the upper surface is to be molded.

In addition, a kungjeon bin 6 is attached to the lower end of the cushion pad 6.
2 is fixed. The cushion pin 62 is inserted into a through hole 22 formed in the lower mold 2.

The upper die 8 and the fixed punch 4 constitute a die for forming the workpiece 3A. That is, an upper mold surface 82 corresponding to the upper surface shape of the fixed punch 4 is formed on the lower surface of the upper mold 8, leaving the thickness of the workpiece 3A.

The bending blade 9 is for bending a portion of the workpiece 3A, and has a substantially rectangular cross section. And bending blade 9
Upper mold 8 on the side opposite to the side where the beam 7 and the pad 6 are located, that is, on the outside of one side 48 of the fixed punch 4
is fixed to the bottom of the

Furthermore, the lower end of the bending blade 9 protrudes below the lower surface of the upper mold 8. Furthermore, one end surface 92 of the bending blade 9
is located slightly outside one side 48 of the fixed punch 4, that is, just outside the thick plate bone of the workpiece 3A.

To explain the re-pressing method using the re-pressing apparatus l according to the above configuration, taking as an example the case of processing a fender panel into an over fender panel, first, the second
Fender panel 3A, which is a pressed product as shown in the figure
is prepared.

Next, the upper mold 8 and cushion pad 6 of the re-pressing device 1 are used to form the wheel arch 32 of the fender panel 3A.
and its surroundings are preserved. This state is shown in FIG. 1(A).

Next, as the upper die 8 is lowered from this state by a press drive device (not shown), the fender panel 3 is gradually formed as shown in 3B by the end surface 92 of the bending blade 9 and the fixed punch 4. Figure 1 (B) shows this state.
It is.

Next, as the upper mold 8 further descends from this state, the bending blade 9 bends the flange portion 34 of the fender panel 3B. This bending process is carried out by pulling the flange portion 34 as shown in 30 while restraining the entire circumference between the end surface 92 of the bending blade 9 and the side surface 48 of the fixed punch 4 with a proper clearance. This state is shown in FIG. 1(C).

Then, the upper die 8 is further lowered and the fender panel 3C is formed into a 3D shape by the fixed punch 4. This state is shown in FIG. 1(D).

After this, the fender panel 3D is bent by the bending process shown in FIG.
It is bent by the bending cam process shown in C).

In this way, the completed over fender panel 3
A perspective view of E is shown in FIG. 3, and a cross-sectional view taken along the line IV--IV is shown in FIG.

Although the present invention has been described above based on specific embodiments, it is not limited thereto, and various other embodiments can be considered by those skilled in the art within the scope of the claims.

For example, in the above embodiments, a fender panel is processed into an over-fender panel, but the present invention can be widely applied to any product that can be manufactured by press working.

〔Effect of the invention〕

As explained above, in the re-pressing method for a pressed product and its processing method according to the present invention, tension forming is properly performed under certain restraint conditions in the process of re-pressing the pressed product. Due to this structure, deformation during molding can be prevented and the quality of the product can be sufficiently ensured.

In addition, since it does not require as many dedicated molds and processes as in the past, it has the excellent effect of significantly reducing equipment costs and reducing product manufacturing costs, especially in the case of small-volume production.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing the re-press molding process of a press-formed product according to the present invention together with its processing equipment, Fig. 2 is a perspective view of the fender panel, Fig. 3 is a perspective view of the over fender panel, and Fig. 4 is ■-■ line in Figure 2 and IV in Figure 3
FIG. 5 is a cross-sectional view taken along the line -IV, and is a cross-sectional view schematically showing the process sequence for processing a fender panel into an over fender panel. 1 - Re-pressing device 2 - Lower die 4 - Fixed punch 8 - Upper die 9 - Bending blade Applicant: Toyota Motor Corporation No. Figure 1

Claims (2)

[Claims] (1) The press-formed product is bent by a bending blade fixed to an upper mold, and the press-formed product is tensile-formed while restrained by a fixed punch fixed to the bending blade and a lower mold. Method for re-pressing pressed products. (2) In a re-pressing device for press-worked products, which consists of a fixed punch fixed to a lower die and an upper die, for re-pressing a press-worked article to produce a new press-worked article, A re-pressing device for press-worked products, characterized by a fixed bending blade for bending the press-worked products.