JP2576486B2 - Press molding method and apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The disclosed technology belongs to the field of a technology of punching and forming a product having a complicated shape from a single material panel such as a steel plate by press forming.

Thus, the invention of this application punches and molds a workpiece for a subsequent finishing process or the like in which the surroundings are intricately formed on a supplied material panel, and forcibly removes the scrap from the molding process from the molding process. The present invention relates to a press forming method and a device directly used in the press forming method so as not to hinder the continuous punching and continuous discharge forming. The stamped and formed scrap is shortened at the vertical cutting portion between the scrap and the work by a shortened curved blade to reduce the projected area, and the scrap is smoothly discharged, and the subsequent work is performed. The present invention relates to a press-forming method and a press-forming method for smoothly performing extrusion.

<Prior Art> As is well known, in press molding, a technique of continuously performing punch forming by an outer blade of the lower die and an inner blade of the upper die by repeatedly raising and lowering the upper die relative to the lower die has been widely adopted. However, in this case, naturally, in the forming step of punching and forming the work on the supplied material panel, the scrap of the residual material is discharged so that the continuous punching of the work can be performed without any trouble. However, in the blanking of small parts, the supply of the strip-shaped material panel enables the continuous discharge of the scrap. The material panel, such as a steel plate, is intermittently supplied to perform the punch forming. Therefore, after the punch forming of the seed work, the scrap of the remaining material formed by punching the workpiece from the material panel is supplied. The scrap must be discharged in the same cycle as the vehicle, so that a scrap of the residual material is forcibly discharged from the die that has been subjected to the punching and molding, for example, in association with the lifting process of the upper die. A mold is provided with a holding pin to hold down the scrap in a cushion manner and pay out with a scrap scraper.For example, the technique of devising Japanese Utility Model Publication No. 60-20334, or the operation of the ram in the upper mold lifting process. The scrap is also forcibly discharged through a chain or the like,
For example, there is Japanese Utility Model Publication No. 61-97320.

However, when punching such a medium-sized or large-sized work, there is a mode in which the size of the material panel is usually made slightly larger than the size of the work so that scrap is not generated. When performing punch forming of a work such as a wheel arch when performing panel press forming, the peripheral shape of the work is a complicated uneven shape, and when the change in curvature is drastic, the scrap is considerably large. Therefore, instead of discarding the scrap in order to reduce costs and improve the material yield, a sub-work of small parts is punched out of a scrap panel from the scrap in order to make effective use of the scrap. Scraps of the residual material formed by stamping out the work as final non-reusable System that has been put into practical use have been developed. In such an embodiment, the sixth
As shown in the drawings below, the supplied raw material panel 1 is supplied to a press forming apparatus 2 to punch and form a fender panel 3 as a work having a complex uneven peripheral shape including a wheel arch of an automobile. The punch 3 of the work 3 and the remaining material 9 are formed by the outer cutter 5 of the lower mold 4 and the inner cutters 7 and 8 of the upper mold 6.
Is formed, and a scrap 10 corresponding to a wheel arch having a considerably large area is cut from the residual material 9 by a cutter (not shown), and the workpiece 3 and the scrap 10 are selectively discharged by chutes 11 and 12, respectively, by their own weights. Had to be.

<Problems to be Solved by the Invention> However, in the press forming of the conventional type, there is a case where the scrap 10 itself is discarded.However, in order to reduce costs and improve the material yield, the scrap 10 is The technology for providing the sub-work of the parts for punching and the effective use of the material has been developed as described above. Therefore, the scrap 10 discharged from the chute 12 is used for the punching and forming of the sub-work for the small parts. Some technologies do so.

For this purpose, a punching and forming apparatus for the small-part sub-work is required separately from the press-forming apparatus 2 for the work 3, which increases the number of overall components, which may hinder the cost reduction from capital investment. There is an inconvenience that there is an advantage and that the process management is complicated, and that a management system for synchronous control of the cycle of placing and molding the work 3 of the press molding apparatus 2 and the cycle of punching and molding of the sub-work is complicated. In addition, even if a scrap device for the scrap 10 of the remaining material 9 of the press forming device 2 for the work 3 is provided in
On the other hand, the scrap 10 formed by punching and forming the sub-work must be discharged upward due to the condition of the remaining material 9 descending and the setting of the cutting edge of the sub-work provided in the lower mold. It is difficult to forcibly discharge the scrap 10 upward in the press forming apparatus due to interference such as biting of the edge of the vertical cutting portion of the subwork by the corresponding cutting edge, and the design is extremely difficult. In view of these problems, there has been a strong demand for a technique capable of shortening the forming process and selectively discharging the remaining material and scrap, and also forcibly discharging the same, thereby enabling continuous blanking of the workpiece.

<Object of the Invention> The purpose of the invention of this application is a medium-sized
It is a technical issue to solve the problem of punching and molding of workpieces from large material panels.Selective forcible discharge of workpieces and scraps from material panels is performed while the workpieces are formed in one shot. In addition, continuous punching of workpieces is guaranteed, product yield is improved, materials are used effectively, leading to cost reductions, and the use of molding technology in the machine manufacturing industry by making work control and management easier. It is an object of the present invention to provide an excellent press forming method and apparatus which is advantageous in the field.

<Means for Solving the Problems> In order to solve the above-mentioned problems, the configuration of the invention of the present application, which is based on the above-mentioned object, is formed by stamping and forming a work from a material panel to the next stage. In the press forming method of discharging the scrap by doing, based on the press forming method to perform the shortening forming on the scrap at the time of the punch forming of the work and then discharge the scrap, In a press forming apparatus equipped with a lower die having an outer blade as an apparatus to be directly used and mounting a material panel and an upper die having an inner blade for the outer blade, the lower die has a shortened curved blade for scrap. Provided,
On the other hand, the upper mold is provided with the technical means of a press forming apparatus provided with the other shortened curved blade that meshes with the shortened curved blade of the lower mold.

<Operation> Then, a medium-sized and large-sized workpiece forming material panel supplied to the press forming apparatus is supplied to the press forming apparatus and set on the lower mold. A predetermined medium-sized or large-sized work is stamped and formed by the outer cutter of the lower mold, and the work or the vertical cutting portion between the work and the scrap is cut by the cutters of the lower and upper molds. The shortened curved blades corresponding to each other of the lower mold and the upper mold hold the scrap to perform the compacting, reduce the projection area, the scrap is reliably separated from the work, and the work and the scrap are Each scrap is separately discharged, the scrap is lifted upward and discharged forcibly, and the work, the remaining material, the sub-work, and the scrap from the material panel are stamped and formed in one process, and furthermore, each interferes with each other. This Without being smoothly discharged separately, the press molding process is reduced to one shot improves work efficiency,
The material yield is improved and leads to cost reduction, and a highly reliable and accurate work can be obtained.

<Embodiment> Next, an embodiment of the invention of this application will be described with reference to FIGS. The same parts as those in the sixth and subsequent drawings will be described using the same reference numerals.

The illustrated embodiment is an embodiment in which a work 3 of a fender panel having a wheel arch for a hollow or large front wheel among the parts of an automobile as a work is punched out from a material panel 1 of the work 3 and FIGS. In the embodiment shown in FIG. 1, reference numeral 2 'denotes a press forming apparatus which forms a part of the gist of the present invention, and is used for stamping and forming a work 3 from a blank material panel 1 having a predetermined size. The outer cutter 5 is provided with inner cutters 7 and 8 of an upper mold 6 ', and the remaining material 6 formed by stamping the work 3 is rearwardly and laterally attached to a lower mold 4'. An inclined chute 11 'is provided.

As shown in FIG. 3, cutters 17, 17, 18, and 18 for cutting the scrap 10 'from the remaining material 9 are provided on the lower mold 4' and the upper mold 6 '. The cutting blades 14 and 15 for punching and forming the sub-work 23 for small parts to be pressed and formed in the next step from the scrap 10 ′ obtained from the punched and formed residual material 9 are the lower mold 4 ′ and It is provided on the upper die 6 '.

As shown in FIG. 3, between the cutters 18, 18 of the upper die 6 ', shortened curved blades 19,
19 is provided, and the lower mold 4 'is provided with the shortened curved blade 19,
Shortening blades 20 each having a concave portion 19 'meshing with the cutting edge 19' are provided, and the width between the parallel vertical cutting portions 21, 21 of the workpiece 3 and the scrap 10 'is reduced by the cutting blade 17, of the lower mold 4'. A reduced minute interval x of the scrap 10 'between the 17 is formed, for example, 2 to 3 mm.

An air cylinder 22 of a lifting / discharging device for lifting and forcibly discharging the scrap 10 'formed by stamping and forming the sub-work 23 is attached to the lower mold 4'. As shown in FIGS. 2 and 3, the provided arm 22 'is provided with bar-shaped chutes 12 and 12' for lifting both ends of the scrap 10 'in parallel.

A discharge chute 13 for the sub-work 23 is inclined rearward inside the lower die 4 '.

A cutter 10 'is cut from the remaining material 9 formed by stamping the workpiece 3 from the material panel 1.
In the step of cutting the standing portions 21 and 21 by 17 and 18, as shown in FIG. 3, the standing portion 2 of the scrap 10 'is
Since the edges 1 and 21 are formed so as to face the work 3 and the remaining material 9, the edges interfere with each other when the scrap 10 'is lifted and discharged.
It is difficult to lift and discharge above 0 '.

To cope with this, in the invention of this application, the scrap 10 'formed by stamping and forming the sub-work 23 has cutting edges 14, 15 of the sub-work 23 substantially in the center as shown in FIG. 4 and 5, when the scrap 10 'is cut, the cutting edge 19, 20 is used to cut the scrap 10' from the general portion of the scrap 10 ', as shown in FIGS. By forming the grooves 25, 25 between the 21 portions, a bead portion 10 ″ having a width reduced by 2x length is formed, and therefore, the width thereof is reduced to the concave groove portion.
In the vicinity of the bead portion 10 ″ of the scrap 10 ′ having the portions 25, 25, both ends thereof are narrowed by x of 2 to 3 mm to reduce the projection area, and the mutual interference of the standing portions 21, 21 is reduced. Air cylinder of lifting and discharging device which can be avoided and does not bite
The lifting of the chutes 12, 12 'with respect to the scrap 10' by the
0 'is lifted and discharged upward without any trouble. Therefore, as shown in FIG. 1, the residual material 9 is formed by the chute 11', the sub-work 23 is formed by the chute 13 and the scrap 10 is formed. ′ Are smoothly discharged downward and upward by the chutes 12 ′ and 12 ′, respectively, so that the punching of the work 3 in a continuous predetermined cycle is performed as designed.

When the press forming apparatus 2 'performs the punch forming of the work 3 of the fender panel, the upper panel 6' is positioned at a predetermined position on the lower panel 4 'in the raised position, and the material panel 1 is placed. When the upper mold 6 'is lowered through the ram which does not work, the outer cutter 5 of the lower mold 4' and the inner cutter 7 of the upper mold 6 ',
8, the workpiece 3 having a complicated contour including the wheel arch is punched and formed, and the workpiece 3 and the remaining material 9 are separated.
At the same time, a rectangular sub-work 23 is stamped and formed by the cutting edge 14 of the lower die 4 'and the cutting edge 15 of the upper die 6' at a portion corresponding to the scrap 10 'at the center of the remaining material 9, and the chute 13 is formed. Through the next press forming process, and is discharged obliquely downward by its own weight.
1, 21 are cut and formed in a predetermined manner by the cutter 17 of the lower mold 4 'and the cutter 18 of the upper mold 6'.

Accordingly, the shortened curved blade 1 of the upper mold 6 ′ and the shortened curved blade 20 of the lower mold 4 ′ are provided between the vertical cutting portions 21, 21.
9, and the corresponding shape portion 19 'of the shortened curved blade 20 opposed thereto
As a result, a zigzag folded bead portion 10 "having concave grooves 25, 25 is formed as shown in FIGS. 4 and 5, and the vicinity of the bead portion 10" is located between the standing portions 21, 21 of the scrap 10 '. The length is reduced by x at both ends of 4 to 6 mm from the width and length, and as a result, the projected area is reduced, and the scrap 10 'and the remaining material 9 are completely separated to form the lower mold 4'. Upper mold 6 '
Rises, the remaining material 9 is discharged obliquely downward through the chute 11 '.

Also, the scrap 10 'is provided with an arm 2 provided at the tip of the rod by extending an air cylinder 22 as a lifting and discharging device.
Since the chutes 12 ', 12' rise via the 2 ', the chutes 12', 12 'rise from the shortened curved blade 20 and slide forcibly to discharge the work.
The remaining material 9 and the scrap 10 'are separated and discharged in different directions by one action, and the work 3 is taken out in a predetermined manner and discharged to the next finishing step.

Then, as shown in FIG. 4, the scrap 10 'separated from the remaining material 9 is cut off and separated from the sub-work 23 at the center thereof, and is formed with concave grooves 25, 25 of the bead portion 10 ". Can be substantially disposed of as waste.

Incidentally, the operation timing of the air cylinder 22 is mechanically or electrically linked to the ram or the upper mold 6 'at a predetermined timing by the ram of the upper mold 6' as in the conventional mode described above. To operate synchronously.

It should be noted that the embodiment of the invention of this application is not limited to the above-described embodiment, and for example, the scrap is lifted by being appropriately linked and lifted when taking out the scrap without using the lifting and discharging device. Various modes, such as allowing discharge in the direction, can be adopted.

In addition, discharge by air jet or the like is possible as a design change.

The work to be applied is not only a fender panel and a quarter panel having a wheel arch of an automobile, but also other medium-sized and large-sized works in which the periphery is complicatedly bent, and a scrap formed by stamping and forming a work from a material panel occurs. Everything can be applied.

<Effects of the Invention> As described above, according to the invention of this application, basically, a fender panel having a wheel arch or a quarter panel, such as a medium-sized or large-sized panel, is driven from a material panel having a complicatedly bent peripheral shape. In a mode in which the scrap generated during the blanking can be discharged, not only the blanking of the workpiece from the material panel but also the effect of simultaneously reducing the area of the scrap can be achieved. When the scrap is discharged in another direction, the scrap is lifted and discharged upward due to the scrap remaining on the lower cutting edge. The scraps are lifted and discharged upward without any biting at the time of discharge, due to interference between the parts that overlap each other. In the process of forming the vertical cutting part, the scraping is performed simultaneously with the punching of the work in the direction crossing the vertical cutting part, so the scrap does not interfere at the edge of the vertical cutting part with respect to the work and discharges smoothly without biting The effect which can be performed is produced.

In addition, scraps are effectively used and materials are effectively used, and shortened molding, which is not used for reuse, is performed. Is played.

Therefore, not only the target medium-sized and large-sized workpieces are punch-formed but also the scrap shortening and molding are performed at the same time, so that initial costs and running costs due to capital investment are reduced, and the effect of greatly contributing to cost reduction is achieved. Is played.

Further, since the press forming apparatus is provided with a die and a chute for punching and forming a scrap, a forced discharge device or the like is not required, and therefore, there is an effect that a facility space or another space is not required.

Further, since only one press molding device is required for scrap collection, the material processing equipment can be reduced in size and the management can be facilitated.

Further, since the scrap is discharged only once from the press forming apparatus, there is a secondary advantage that the scrap can be easily processed.

[Brief description of the drawings]

1 to 5 are explanatory views of one embodiment of the invention of the present application. FIG. 1 is an overall schematic vertical sectional side view of a press forming apparatus, and FIG. 2 is a relative relationship between a material panel, a work, a remaining material, and scrap. FIG. 3 is a perspective view of the scrap after punch forming of the sub-work, FIG. 3 is a perspective view of the scrap after punch forming of the sub-work, and FIG. ,
FIG. 6 is a schematic sectional view of a press forming apparatus based on the prior art, FIG. 7 is a perspective view showing the relationship between the material panel, the work, the remaining material, and the scrap, and FIG. 8 is a perspective view of the scrap. 1 ... Material panel, 3 ... Work, 9 ... Remaining material, 23 ... Subwork, 10 '... Scrap, 21 ... Standing section, 5 ... Outer blade, 7, 8 ... Inner blade, 4 ': Lower die, 6': Upper die, 2 ': Press forming device, 14, 15: Cutting blade, 19, 20 ... Shortened curved blade, 22: Lifting and discharging device

Claims (2)

(57) [Claims] 1. A press forming method for punching a work to a next stage from a material panel and discharging a residual material,
During the blanking of the workpiece, the sub-work is simultaneously punched and formed with respect to the remaining material, and the sub-work is subjected to a shortening process for the punched and formed scrap, lifted up afterwards, and then discharged. Press forming method characterized by performing. 2. A press forming apparatus equipped with a lower die having an outer blade for mounting a material panel and an upper die having an inner blade for the outer blade. A blade is provided and a shortened curved blade for the scrap is provided, while the upper die is provided with a cutting blade for the cutting blade of the lower die and the other shortened curved blade meshing with the shortened curved blade of the lower die is provided. A press forming apparatus further comprising a lifting and discharging device for the scrap.