JPS60263609A - Method of cutting raw sheet metal - Google Patents

Abstract

PURPOSE:To improve the yield of yielding raw sheet metal while sharply reduce the cost of a cutting mold by marking the raw sheet metal supplied to the cutting in succession, after making pierced holes at respective boundaries between said cutting lines, said raw sheet metal for each of said divided portions. CONSTITUTION:Raw sheet metal 15 is continuously supplied to a cutting mold in a prescribed direction, and cut in succession from an end thereof following a size and a curved marginal edge in response to a product shape A. Thereupon, in sutting the raw sheet metal 15, pierced holes 17 are first made at a boundary between two divided cutting lines 16a, 16b with use of peircing punch, etc. Then, one cutting line 16a of the raw sheet metal 15 to the hole 17 is cut out, and thereafter in the next process the other cutting line 16b extending from the other side of the raw sheet metal 15 to the hole 17 is cut out. Thereby, raw sheet metal 15a corresponding to the one product shape A is yielded. Thus, the yield of raw sheet metal can sharply be improved together with reduction of the cost of a cutting mold.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for cutting a sheet metal material that is continuously fed to a cutting die.

(Prior Art) FIGS. 1 and 2 are diagrams illustrating the structure of a conventional cutting type.

That is, it consists of a cutting die 1, an upper die 3 fixed to the lower surface of a vertically movable slide 2, and a lower die 5 fixed to a bolster 4 facing the upper die 3, The upper mold 3 has a pad 7 suspended from its lower surface via an elastic body 6, and has an upper mold cutting blade 8. The lower mold 5 has a sheet metal material along with the upper mold cutting blade 8. A lower mold cutting blade 10 is provided for cutting 2.

The sheet metal material 2 is in the form of a belt, and is continuously fed in a fixed direction (in the direction of the arrow in FIGS. 1 and 2) while being guided on both sides by guides 11, 11 provided on the lower die 5. It is something that will be done.

When cutting the sheet metal material 2, when the sheet metal material 2 is advanced to a predetermined cutting position and stopped, the slide 2 is lowered, and the gap between the pad 7 in contact with the sheet metal material 2 and the upper die 3 is lowered. The repulsive force of the elastic body 6 compressed by the compressor acts to suppress and fix the sheet metal material to the upper surface of the lower mold 5, and then the lower mold cutting blade F3- and the lower mold cutting blade 10, which descend, cut the sheet metal material. Cut 2.

Further, the cut sheet metal material 2a is transferred to a wheel conveyor 12.
After that, the above-mentioned operation will be repeated.

The individual sheet metal materials 2a obtained in this way are cut into dimensions corresponding to predetermined products for various post-processing processes, for example, as shown by imaginary lines in FIG. Since the sheet metal material 2a after cutting is subjected to processing such as press forming into a hood panel for an automobile, it is necessary to cut the sheet metal material 2a in such a way that the portion that will be cut out and become scrap during subsequent processing will be as small as possible. is desirable.

Therefore, not only the length dimension is set to correspond to the product, but also the cutting edge is formed to correspond to the contour of the product, thereby making the scrap portion smaller.

However, in the conventional cutting die 1, cutting was performed by a pair of cutting blades 8 and 10, so when cutting the sheet metal material 2 for different types of products, for example,
It is possible to change the length dimension by changing the feed pitch to the cutting die 1, but since it is naturally impossible to make it correspond to the contour of the product, it is possible to change the length without damaging the contour of the new product. Therefore, there is a problem in that the portion that is unavoidably scrapped becomes large as a result. Furthermore, if a rectangle is manufactured each time depending on the product, the cost of the mold becomes enormous, and there is a problem in that it is really uneconomical to produce the product.

(Object of the invention) This invention was made by focusing on the above-mentioned conventional problems, and it is possible to cut according to the shape of different products with the - group cutting type, and at the same time The object of the present invention is to provide a method for cutting a sheet metal material that can minimize the amount of parts that become scrap during subsequent processing.

(Structure of the Invention) The method for cutting a sheet metal material according to the present invention includes the following steps when cutting the sheet metal material supplied to the cutting die along a cutting line of an appropriate shape.
The method is characterized in that the cutting line is divided into an appropriate number of sections, a pierced hole is formed at a boundary position between each sectioned cutting line, and then each section is sequentially cut.

(Example) The present invention will be explained below based on the drawings.

FIGS. 4 to 8 are diagrams illustrating an embodiment of the present invention.

That is, as shown in FIG. 4, this sheet metal material 15 is in the form of a band, and by continuously feeding the sheet metal material 15 from a fixed direction to the cutting die, the product shape A (dotted line in the figure) is obtained from the end. It is cut to fit the dimensions and curved edge shape (shown in ).

Further, the cutting line 16 (indicated by a virtual line in the figure) has an appropriate margin from the curved edge shape, and is set to be divided into two parts, a parting cutting line 16a and a parting cutting line 16b, at the center of the dome. .

When cutting the sheet metal material 15, first,
A piercing hole 17 is formed at the boundary position between the two divisional cutting lines 16a and 16b using a piercing punch (not shown), and then,
After cutting one section cutting line 1.6a that reaches the pierced hole 17 from one side of the sheet metal material 15, the other section cutting line 1.6a that reaches the pierced hole 17 from the other side of the sheet metal material 15 is cut in the next step. By cutting along the division cutting line 16b, a sheet metal material 15a corresponding to one product shape A is obtained.

Further, FIGS. 5 and 6 are diagrams illustrating an example of a cutting die that performs cutting based on the above-mentioned cutting method.

That is, this cutting die 20 has a slide 2 that can move up and down.
Two upper molds 22 and 23 are provided on the lower surface of the mold 1 so that their positions can be adjusted, and a lower mold 25° 26 that faces each of the upper molds 22 and 23 is provided on the bolster 24 so that their positions can be adjusted. It is something.

One of the upper molds 22 and 23 has an upper mold cutting blade 22a that cuts one divisional cutting line 16a of the aforementioned cutting line 16, and the other upper mold 23 has a line 1
Upper mold cutting blade 23a that cuts the other divisional cutting line 16b of 6
Furthermore, each upper mold 22 and 23 is provided with a pad 27 that presses and fixes the sheet metal material 15 during cutting.
It is suspended by 8.

Further, each of the lower molds 25 and 26 has an upper mold 22 opposite thereto.
．． Lower die cutters 125a, 26a are provided to pair with upper die cutting blades 22a, 23a provided in 23, and each lower die 25, 26
Wheel conveyors 2 and 30 for conveyance are installed on the discharge side (left side in FIGS. 5 and 6).

Then, the sheet metal material 1 is cut using the cutting die 20 having the above configuration.
5, the pair of cutting blades 2Za and 25 are used, respectively.
The upper dies 22, 23 and the lower dies 25, 26 are installed so that the intervals between the cutting edges 22a, 23a, 26a match the intervals of the cutting line 16 (see FIG. 4), and the cutting edges 22a, 25a, 2
3a and 26a are adjusted so that they can cut the respective section cutting lines 16a and 16b, and then the sheet metal material 15 is fed from one of the upper mold 22 and lower mold 25 sides (the right side in FIGS. 5 and 6). .

At this time, pierce holes 17 are formed in the sheet metal material 15 at intervals of the cutting lines 16 as pre-processing, and the sheet metal material 15 is pierced by the reciprocating movement of the slide 21 and the feeding pitch that matches the interval of the cutting lines 16. By performing the feeding operation alternately, the upper die 22 and the lower die 25 cut one section cutting line 16a, and after the next feeding operation, the upper die 23 and the lower die 26 cut the other division cutting line 16a. The operation of cutting the section cutting line 16b and separating the sheet metal material 15a is performed continuously.

In addition, when cutting with a cutting line corresponding to a different product shape, for example, if the cutting line has a further curved shape, as shown in FIG. 7 on the bolster 24 side,
Adjust the angle of the upper mold and lower mold 25, 26, and cut the respective cutting edges 2.
5a and 26a are arranged so as to coincide with the cutting line 16.

In other words, the cutting die 20 configured based on the method of sequentially cutting divided cutting lines for each division naturally has a cutting blade for each divisional cutting line, so it is not necessary to change the arrangement of the cutting blades. The cutting shape can be changed by changing the cutting shape, and it becomes possible to correspond to different cutting lines 16, as shown by imaginary lines in FIG.

Note that when cutting the two section cutting lines 16a and 16b sequentially, cutting force from the vertical direction is applied only to half of the sheet metal material 15 when cutting one section cutting line 16a, so that the section cutting line Distortion or breakage is likely to occur at the end of 16a,
Therefore, as explained earlier, section cutting is done! ! 16a, 16b
By forming the pierced hole 17 at the boundary position, the cutting force applied locally will not affect other parts, thereby preventing distortion and breakage.

Further, although a piercing punch or the like for forming the piercing hole 17 is not shown, a piercing punch is provided at a position corresponding to the length of the feed pitch from the upper mold cutting edge 22 & of one upper mold 22 on the slide 21, Naturally, the cutting and piercing may be performed continuously by the vertical reciprocating movement of the slide.

FIGS. 9 to 11 are diagrams illustrating some examples of cutting the sheet metal material 15 based on other cutting line shapes.

That is, FIG. 9 shows a case where a predetermined bent cutting line 16 is cut, and the cutting line 16 is cut into two sections! 1.
The sheet metal material 15 is divided into 16a and 16b, and a pierced hole 17 is formed at the almost central boundary position.
This shows the case of cutting a cutting line 16 that is asymmetrical with respect to the feeding direction (direction of the arrow in each figure);
is divided into two dividing lines 16a and 16b, and a pierced hole 17 is formed approximately at the central boundary position.

In the above two examples, cutting is performed using a cutting die equipped with two pairs of cutting blades as described in the embodiment.

In addition, in FIG. 11, the cutting line 16 is divided into three dividing cutting lines 16a.
, 16bl, 16C, and piercing holes 17° and 17 are formed at the two boundary positions, respectively.

In this case, the cutting die is constructed with three pairs of cutting blades, and by adjusting the position of each cutting blade, it is possible to cut along a cutting line that corresponds to the product shape.

In addition, when dividing a cutting line having an appropriate shape, for example, by dividing it into roughly straight parts, it becomes easier to form the cutting edge, and the range of combinations depending on the cutting line based on other product shapes can be made. However, it is better to set the division of the cutting line and the installation of the cutting blade according to the division in advance so that the scrap portion can be made as small as possible, taking into account other expected product shapes. .

(Effects of the Invention) As described above, according to the sheet metal material cutting method of the present invention, when cutting the sheet metal material supplied to the cutting die with a cutting line of an appropriately shaped shape, the cutting line is , and after forming a pierced hole at the boundary position of each divided cutting line, the method is to sequentially cut each of the divisions, so one unit is equipped with a cutting blade for cutting each of the divisions whose position can be adjusted. The cutting die makes it possible to accommodate cutting lines of different shapes, so even if the product shape changes, there is no need to increase the size of wasted parts that will be scrapped during later processing, and the sheet metal can be cut easily. In addition to improving the yield of materials, mold costs and the like can be significantly reduced.

[Brief explanation of drawings]

FIG. 1 is a plan view of a lower die to explain a conventional cutting die;
Figure 2 is a side sectional view illustrating the same conventional cutting die, Figure 3 is a perspective view illustrating the case where the sheet metal material after cutting is press-formed into an automobile hood as a post-processing process, and Figure 4 is a side sectional view illustrating the same conventional cutting die.
The figure is a plan view of a sheet metal material explaining an embodiment of the present invention.
FIGS. 5 and 6 are a plan view and a side sectional view of a lower die for explaining an example of a cutting die to which the method of the embodiment shown in FIG. 4 is applied;
Fig. 7 is a plan view of the lower mold illustrating the state in which the position of the cutting blade has been adjusted according to the shape of the cutting line, Fig. 8 is a plan view illustrating changes in the cutting line, and Figs. 9 and 10 are FIG. 11 is a plan view illustrating a case where the cutting line is divided into three parts. 15... Sheet metal material, 16... Cutting line, 17... Pierce hole, 20... Cutting mold. Patent applicant: Nissan Motor Co., Ltd. Patent attorney Yutaka Oshio Figure 6 j17vI. Figure 8 6

Claims (1)

[Claims] (1) When cutting the sheet metal material supplied to the cutting die along a cutting line of an appropriate shape, divide the cutting line into an appropriate number, and form a pierced hole at the boundary position of each divided cutting line. A method for cutting a sheet metal material, characterized in that the cutting is performed sequentially for each section.