JPH0547319B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an automatic progressive press die, and more particularly to an automatic progressive press die that performs punching and forming at the same time.

[Conventional technology]

In the conventional automatic progressive processing process, the coiled material is unwound and a slit is made in the material using an upper punch and a lower die (outline cutting process).
The next step was to mold the entire piece.

[Problems to be solved by the present invention]

However, in conventional automatic progressive processing, in principle one product is taken out, and when taking out two products, it is only possible to form and take out bilaterally symmetrical parts, and it is difficult to take out three or more products. Then, if you try to take out 3 products, you can use 1 punch to take out 3 products.
Due to the need to mold the product, the outline cutting process has increased 2
~ Three steps are required, and when moving to the forming process, there are three slits in the material, which causes the center of the material to sag, causing interference with the lower die drawing punch, interference between the materials, and unevenness in forming. It was hot. Therefore, in conventional automatic progressive processing,
It was not possible to reduce the number of steps.

The present invention has been made to solve the above problems, and an object of the present invention is to provide an automatic progressive press mold that can perform punching and forming at the same time to reduce the number of steps.

[Means to resolve the problem]

In order to achieve the above object, the present invention positions a sheet-shaped workpiece between an upper die and a lower die, and by fitting the upper die and the lower die, the workpiece is subjected to drawing and drawing processing. In an automatic progressive press die for bending, a plurality of punches are provided in the upper mold along the feed direction of the workpiece, and each punch has a punching portion at least at the upstream edge in the feed direction.
A forming section is integrally formed on the downstream side thereof, the punching section has a height greater than the forming section, and a forming section is formed downstream of each drawing punch, independent of the operation of the drawing punch. The upper die is provided with a plurality of sub-pads capable of pressing the workpiece by pressing the workpiece, and the upper die bends the downstream end of the workpiece and locks it to the downstream edge of the lower die prior to forming. The present invention is characterized in that a downstream end is provided, and a bending punch for bending the workpiece sent from the drawing and drawing punch is disposed downstream of the drawing and drawing punch in the direction in which the workpiece is fed.

In that case, it is desirable that the length from the center of the drawing punch to the part where the fold line of the product is formed is longer than the length from the center of the bending punch to the processing part where the fold line of the product is bent.

[Effect]

According to the present invention, a plurality of workpieces are punched so as to be sheared into a plurality of pieces by the punching section of a plurality of punches, and then a plurality of workpieces are punched by a forming section of the punches. is molded. Therefore, punching and molding can be performed simultaneously using the same upper and lower molds.

〔Effect of the invention〕

As explained above, according to the present invention, punching and forming are performed simultaneously using the same upper die and lower die with a drawing punch, thereby reducing the number of steps and die costs. This effect can be obtained.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 shows an embodiment of the present invention. In this embodiment, parts A, B, and C are simultaneously punched and molded.

Three upper die drawing punches 10 are formed in the upper die so as to be arranged in parallel in the forward feeding direction of the workpiece, and this upper die is fixed to the upper die main body 14 via a clamping plate 12. ing. Each of the upper die drawing punches 10 is provided with a forming section 10A and a punching section 10B preceding the forming section 10A. Three rod-shaped sub-pads 16 pass through the upper die. Each of the sub pads 16 is fixed to a plate 18 that slides with respect to the upper mold body 14. Fixed plate 1 fastened to upper mold body 14 in parallel with plate 18
5 is arranged, and a compression spring 20 is interposed between this plate 18 and the fixed plate 15. Therefore, each subpad 16 is constantly pressed downward in the figure by the compression spring 18 via the plate 18. This subpad 1
The stroke of No. 6 is set slightly shorter than the stroke of the main pad 22 provided on the upstream side, so that the sub pad 16 presses the workpiece before the main pad 22 presses the workpiece. Further, the sub pad 16 is prevented from shifting by a rotation stopper 24. Note that 26 is a positioning key.

Three lower die drawing dies 28 are formed on the lower die so as to face each of the upper die drawing punches, and the lower die is connected to the lower die main body 3 via a plate 30.
It is fixed at 2.

The upper mold bending punch 34 of the press mold for the bending process is fixed to the upper mold main body 14 via a tightening plate 36, and the lower mold bending die 38 is directly fixed to the lower mold main body 32.

Note that 40 and 42 are positioning keys for ensuring reproducibility of assembly.

Next, the processing steps of this embodiment will be explained with reference to FIGS. 2A to 2D. A workpiece 1, which is a plate material wound into a coil, is unwound and interposed between an upper die and a lower die via a leveler 3. At the beginning of the press, as shown in FIG.
Press to prevent the workpiece from shifting. When the upper die further descends, the punching part 10B of the upper die drawing punch 10 comes into contact with the workpiece 1, and as shown in FIG. 2B, punching starts and the workpiece is reduced to three pieces. Sheared. This makes it possible to ensure the precision of product edges and eliminate variations. Further, during punching, the feed downstream device 10C of the upper die begins to bend the workpiece, and prevents the workpiece from being drawn in after punching. When the upper die further descends, the forming section 10A of the upper die drawing punch 10 forms the sheared workpiece into the shape shown in FIG. 2C, thereby completing the drawing process.

After the drawing and drawing process is completed, the workpiece is fed one pitch at a time, and the product is bent using the upper bending punch 34 and the lower bending die 38 to form parts A, B, and the like as shown in FIG. 2D. Part C is manufactured. In addition, in order to prevent the bending line from drawing and drawing from remaining on the product at the end of this bending process, the distance from the center of the product to the bending line at the end of drawing and drawing, l ₁ , and the distance from the center of the product to the bending line, at the end of bending, l It is preferable to determine the shape of the drawing punch so that _{l 1 >} l ₂ .

In addition, although the example in which a press die for bending was provided has been described above, this press die may be omitted depending on the shape of the product, and the sub-button may also be omitted.

As explained above, according to this embodiment, the conventional outline cutting process can be omitted by inserting and forming the same number of products into the workpiece at once. There is no need to send the workpiece, so there is no variation or interference in the workpiece.Furthermore, the rigidity of the workpiece is strengthened by forming it immediately after the punching process, and even if the width of the workpiece is the same, For example, parts of any size can be combined and manufactured.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view showing an embodiment of the present invention;
FIGS. 2A to 2D are explanatory diagrams for explaining the operation of the above embodiment. 10... Drawing punch, 10A... Forming processing section, 10B... Punching processing section.

Claims (1)

[Scope of Claims] 1. A sheet-shaped workpiece is placed between an upper die and a lower die, and the upper die and the lower die are fitted together to draw and bend the workpiece. In the automatic progressive press die for processing, a plurality of drawing punches are provided on the upper die along the feeding direction of the workpiece, and each punching punch has a
A punching section is integrally formed at least on the upstream edge in the feeding direction, and a forming section is formed on the downstream side thereof, and the punching section has a greater height than the forming section. A plurality of sub pads are provided on the downstream side of the drawing punch and pass through the upper die and are capable of pressing the workpiece independently of the operation of the drawing punch, A downstream end of the workpiece is bent to be locked to the downstream edge of the lower mold, and the workpiece is fed from the punch to the downstream side of the workpiece feeding direction of the punch and draws. An automatic progressive press type characterized by a bending punch for bending the workpiece. 2. A patent claim characterized in that the length from the center of the drawing punch to the part where the fold line of the product is formed is greater than the length from the center of the bending punch to the processing part that bends the fold line of the product. Automatic progressive press mold described in scope 1.