JP2908989B2 - Press working method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press working method for obtaining a molded product by subjecting a formed work to trimming.

[0002]

2. Description of the Related Art Generally, when a molded product is obtained from a plate-like work by press working, after forming the work, trimming is performed to remove unnecessary portions (hereinafter referred to as scrap portions) from the molded product shape portion of the work. Work is being carried out.

When a relatively large molded product is obtained, the scrap removed from the molded product also becomes large. For this reason, for example, Japanese Patent Application Laid-Open
As disclosed in Japanese Patent Publication No. 44-44, after a plurality of dividing slits are formed at the time of restriking by a slit processing portion provided on a die for restriking and a blank holder, products are trimmed by trimming. A method is known in which a scrap portion is separated from a portion and cut off.

[0004]

However, in the above-mentioned prior art, since a dividing slit is formed in the work before trimming, burrs remain on the work during the processing of the dividing slit. Therefore, when trimming is performed next time, burrs are cut by the trimming blade, and chips are likely to be generated, and a problem has been pointed out that the chips cause deformation of a molded product.

The present invention solves this kind of problem and provides a press working method capable of reliably preventing the generation of chips and obtaining a molded product easily and with high precision. The purpose is to:

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a method of forming a work on a workpiece, trimming the work, and removing an unnecessary portion from a molded part of the work. A press working method for obtaining a molded product, wherein before the trimming, a trim line and a trim line
Along the cut line set at the unnecessary part
Forming a continuous groove respectively Te, the unnecessary portion
By pressing the minute portion with a plurality of push bars, the trim line and the cutter are used with the groove as a separation start end.
Performing the trimming along the trim line .

[0007]

In the press working method according to the present invention, after a groove is formed in a predetermined portion of the work, trimming is performed using the groove as a separation start end. For this reason, even in the part where the separation part intersects, the unnecessary part can be surely separated from the molded part through the groove, and it is possible to prevent burrs from being generated on the molded part side. Becomes possible.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A press working method according to the present invention will be described in detail below with reference to the accompanying drawings, with reference to the accompanying drawings.

In FIG. 1, reference numeral 10 indicates a drawing apparatus for performing the press working method according to the first embodiment. The draw forming apparatus 10 includes a lower die 14 and an upper die 16 which can move forward and backward with respect to the lower die 14 in order to form the work 12 which is a thin metal plate into a predetermined shape, for example, a side plate shape of an automobile body. Prepare.

The work 12 has a molded product shape portion 18 and a scrap portion 20, and a trim line 22 is set at a boundary portion between them, and the scrap portion 20 intersects the trim line 22. A plurality of cut lines 24 are set.

The upper mold 16 forms a C-shaped groove portion 26 at the intersection (or near the intersection) of the trim line 22 and each cut line 24 of the work 12 when the work 12 is formed into a side plate shape of an automobile body. (See FIGS. 2 and 3). Punch member 2
Reference numeral 8 is embedded in the upper die 16 and has an arc-shaped projection 30 having a triangular cross section at the lower end.

In FIG. 4 and FIG.
Indicates a trimming device. This trimming device 40
Is a lower mold 42 and an upper mold 4 that can move forward and backward with respect to the lower mold 42.
4 is provided. Trimming blades 46 and 48 for cutting the formed workpiece 12 along the trim line 22 are provided on side portions of the lower mold 42 and the upper mold 44,
A plurality of blade portions 50 for cutting each cut line 24 are fixed to the upper die 44. The blade portion 50 has a cutting blade 52 set in a predetermined shape so as to perform a cutting process on each cut line 24 with the C-shaped groove portion 26 as a separation start end.

Next, a press working method according to the first embodiment using the draw forming apparatus 10 and the trimming apparatus 40 configured as described above will be described.

First, as shown in FIG. 1, after a work 12 is placed on a lower mold 14 constituting the drawing apparatus 10, the upper mold 16 and the lower mold 14 move the work 12 under the lowering action of the upper mold 16. 12 is subjected to a drawing process. that time,
The trim line 22 of the work 12 and each cut line 2 are formed via the protrusion 30 of the punch member 28 provided on the upper die 16.
A C-shaped groove 26 is formed at the intersection of No. 4 (see FIG. 2).

Therefore, the work 12 after the drawing process is
When the upper die 44 is disposed on the lower die 42 of the trimming device 40 and the upper die 44 descends,
2 starts the cutting process with the C-shaped groove 26 at each cut line 24 as a separation start end (see FIGS. 6A and 6B).

When the upper die 44 is further lowered, the cutting blade 52 of the blade portion 50 cuts each cut line 24 from the C-shaped groove portion 26 side (see FIGS. 7A and 7B). Then, lower mold 4
The scrap portion 20 is cut along the trim line 22 by the second trimming blade 46 and the trimming blade 48 of the upper die 44, and the scrap portion 20 is separated into a plurality of pieces and removed from the molded article shape section 18 (FIG. 8A). And FIG. 8B).

In this case, in the first embodiment, the work 12
When the drawing forming process is performed on the
A C-shaped groove 26 is formed at the intersection of the trim line 22 and each cut line 24 of the work 12 through the. Next, in a trimming process, C is applied through the cutting blade 52 of the blade unit 50.
The cutting process is performed on each cut line 24 with the shape groove 26 as the separation start end.

Therefore, the intersection of the trim line 22 and each cut line 24 can be reliably separated from the C-shaped groove 26, and the occurrence of burrs at this intersection can be prevented as much as possible. become. This eliminates the need for the burr removal process and does not generate chips, and reliably prevents deformation of the molded article shape portion 18 to enable easy and efficient high-precision molding. The effect is obtained.

Next, a press working method according to a second embodiment will be described with reference to FIGS.

In FIG. 9, reference numeral 60 denotes a work drawn by a draw forming apparatus (not shown) into, for example, a roof panel shape of an automobile body. This work 6
0 has a molded article shape part 62 and a scrap part 64,
Triangular grooves 68 are formed along the trim lines 66 set at these boundary portions (see FIG. 10). A plurality of cut lines 70 intersecting the trim line 66
The groove 68 is also formed in the cut line 70.

In FIG. 11, reference numeral 72 indicates a trimming device.
A lower die 74 on which the workpiece 0 is placed along the trim line 66, and a plurality of push bars 76 which are arranged corresponding to the scrap portion 64 of the work 60 and can be moved up and down.

In such a configuration, the work 60 in which the groove 68 is formed at the time of drawing is placed on a lower mold 74 constituting a trimming device 72 as shown in FIG. Then, when the plurality of push bars 76 descend, the scrap portion 64 is pressed downward, and the scrap portion 64 is cut along the trim line 66 and the cut line 70 with the groove 68 as the separation start end.

Therefore, in the second embodiment, since the scrap portion 64 is reliably separated from the groove portion 68, it is possible to effectively prevent burrs from being generated on the trim line 66. Thus, it is possible to reliably prevent the generation of chips, and the same effect as in the first embodiment can be obtained.

In the first embodiment, the work 12 has C
Although the shape groove 26 is formed, the shape is not limited to this, and can be set to various shapes such as a T shape, a rectangle, and a triangle.

[0025]

According to the press working method according to the present invention,
The following effects and advantages can be obtained.

After a groove is formed in a predetermined portion of the workpiece, trimming is performed using the groove as a separation start end. Therefore, even at a portion where the separated portions intersect, it can be surely separated through the groove. Can be. Accordingly, it is possible to prevent the generation of burrs as much as possible, and it becomes unnecessary to remove the burrs, thereby preventing generation of chips and easily obtaining a high-precision molded product.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of a drawing apparatus and a work for performing a press working method according to a first embodiment of the present invention.

FIG. 2 is a schematic perspective view of a main part of an upper die constituting the drawing apparatus according to the first embodiment.

FIG. 3 is a longitudinal sectional view of a main part of the upper die.

FIG. 4 is a schematic perspective view of a trimming apparatus for performing the press working method according to the first embodiment.

FIG. 5 is a longitudinal sectional view of a main part of the trimming device.

FIG. 6 is an explanatory view of a press working method according to the first embodiment, FIG. 6A is an explanatory view of a state where cutting of a C-shaped groove is started by a blade, and FIG. It is explanatory drawing of the state which omitted.

7A and 7B are explanatory views of the press working method according to the first embodiment. FIG. 7A is an explanatory view of a blade portion in the process of cutting a C-shaped groove, and FIG. 7B omits this blade portion. It is explanatory drawing of a state.

FIG. 8 is an explanatory view of a press working method according to the first embodiment, FIG. 8A is an explanatory view of a state where a scrap portion is cut by an upper die, and FIG. 8B is an illustration of the upper die omitted. It is explanatory drawing of a state.

FIG. 9 is a schematic perspective view of a work for carrying out a press working method according to a second embodiment of the present invention.

FIG. 10 is a sectional view taken along line XX in FIG. 9;

FIG. 11 is a schematic perspective view of a trimming apparatus for performing a press working method according to the second embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Drawing apparatus 12 ... Work 14 ... Lower die 16 ... Upper die 18 ... Molded product shape part 20 ... Scrap part 22 ... Trim line 24 ... Cut line 26 ... C-shaped groove part 28 ... Punch member 30 ... Protrusion part 40 ... Trim Processing device 42 ... Lower die 44 ... Upper die 50 ... Blade part 60 ... Work 62 ... Molded product shape part 64 ... Scrap part 66 ... Trim line 68 ... Groove part 70 ... Cut line 72 ... Trim processing device 74 ... Lower die 76 ... Push bar

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁶ , DB name) B21D 28/00 B21D 24/16 B21D 28/02 B21D 28/16

Claims (1)

(57) [Claims] 1. A press working method for performing a forming process on a work and then performing a trimming process to remove an unnecessary portion from a formed product shape portion of the work to obtain a formed product. Trim line and the trimla
Cut line set at the unnecessary part crossing the in
Forming a groove continuously along each of the unnecessary portions, and pressing the unnecessary portion with a plurality of push bars.
The trim line and the groove as the separation start end.
And performing the trimming along the cut line .