JPH01140913A - Method for cutting out sheet metal equal in length - Google Patents

Abstract

PURPOSE:To eliminate gaps among butt sections as well as to prevent defictive welding by cutting a secondary sheet metal along the direction of feeding with a primary cutting face left, which is fed to a constant direction while being linearly cut off in the direction intersecting the feeding direction. CONSTITUTION:A sheet metal 16 fed to the direction A from a sheet metal roll 15 by a specified length (1) is cut off in the direction B perpendicular to the feeding direction A so as to form a secondary sheet metal 17, furthermore, the sheet metal 17 is cut off along the direction A into two sheet metals 18 and 19. Herein, the sheet metals 18 and 19 are of an equal length (1), and the primary cutting faces 20 through 23 at the both end sides are in parallel with each other. And required works are processed wherein the cutting faces 20 through 23 are left as they are, and then, the sheet metals are arranged among other sheet metals 24 and 25 into a butting relation over a level block 5. In this case, since the butt faces 26 and 27 of the sheet metals 24 and 25 are linear, the sheet metals 18 and 19 are equal in length and sides at the both ends of them form linear cutting faces 20 through 23 while being in parallel with each other, there will never exist any gap among sheet metals 18, 19, 24 and 25 which are butted into a frame form.

Description

DETAILED DESCRIPTION OF THE INVENTION (°Industrial Application Field) The present invention relates to a method for cutting out a plurality of sheet metal members having equal lengths.

(Conventional technology and its problems) In the past, inner panels for automobile bodies were press-formed from a one-piece sheet metal blank, but this method inevitably produced waste material when punching the sheet metal blank.
In particular, in the case of the inner panel of a door with a window, the window part is punched out, which generates a large amount of waste material. Therefore, recently, a method has been developed to make pressed raw materials by joining together small sheet metal scraps made in other processes using laser welding (Japanese Patent Application Laid-Open No. 1983-1999-1).
(See Publication No. 220229). This method will be explained using the inner panel of a car back door as an example. Four small sheet metal members 1 to 4 are made from scrap materials as shown in FIG. 8, and these sheet metal members are shown in FIG. 9. Gotoku Surface Plate 5
They are arranged on top of each other and butted at four locations, and the butted parts are welded using a laser welding machine 6 to form an integral press material 7. This press material 7 is press-worked to form an inner panel 8 as shown in FIG. It's something you get. Press forming of such welded products was almost impossible in the past, but it is gradually becoming more popular, taking advantage of laser welding's feature of high-density concentrated heat source.

(Problems to be Solved by the Invention) However, although laser welding can perform strong welding without using additives, if there is a gap in the butt portion to be welded, there is a risk of welding defects. Specifically, when sheet metal sheets with a thickness of about 0.8 mm are butted together and laser welded, 10 to 20
If a gap larger than μ is created at the butt portion, welding defects will occur, and problems such as cracks appearing in the welded portion during press forming will occur. To explain this in the case of making the press raw material 7 for the inner panel shown in FIG. Sheet metal members 1 and 4 are not parallel, butt portion 9
There will be a gap between ~12 and 12.

However, there is no problem if the lengths (,) of sheet metal parts 2 and 3 can be precisely machined in microns, but in reality, even if sheet metal parts 2 and 3 are obtained using the same blank mold, the blades of the blank mold may wear out. As a result, the lengths p and β of each sheet metal member 2.3 become uneven in micron units, and the above-mentioned inconvenience has not been solved.

The present invention has been devised to effectively solve these problems, and its purpose is to provide a method that allows a plurality of sheet metal members having exactly the same length to be obtained in a simple manner. It is in.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention involves cutting a sheet metal material supplied in predetermined lengths in a certain direction in a straight line in a certain direction intersecting the feeding direction. to make the secondary sheet metal material,
The secondary sheet metal material is cut along the supply direction to obtain at least two sheet metal members of equal length.

(Function) In the material removal method configured as described above, a pair of accurately parallel cut surfaces are formed in the secondary sheet metal material, and by cutting this secondary sheet metal material in the supply direction, the parallel sides are cut. A plurality of sheet metal members having the same length are obtained, with the ends being at both ends in the length direction.

(Example) An example in which the present invention is applied to a sheet metal member for an inner panel of a back door of an automobile will be described below with reference to the drawings. As shown in FIG. 1, material removal according to the present invention involves cutting a sheet metal material 16 fed from a sheet metal roll 15 in the direction of arrow A by a predetermined length p in a straight line in a direction B perpendicular to the feeding direction A. Then, the secondary sheet metal material 17 is cut along the above-mentioned feeding direction A to form two sheet metal members 18 and 19. The device for cutting in the straight direction may be a conventionally known press type cutting machine, and this cutting machine is fixed so as to always cut in a fixed direction.

Both sheet metal members 18, 19 are of equal length, and the primary cut surfaces 20 to 23 at both ends thereof are parallel to each other. And these primary cutting surfaces 20-2
3 is left intact and subjected to necessary processing, and arranged in abutted state between other sheet metal members 24 and 25 on a surface plate 5 as shown in FIG.

The butt surfaces 26, 27 of the sheet metal members 24, 25 are all straight lines, and the sheet metal members 18, 19 have linear primary cut surfaces 20 that are of equal length and parallel to each other at both ends.
.about.23, there is no gap at all between the sheet metal members 18.about.19.24.25 which are butted against each other in the frame shape as shown in FIG. Furthermore, even if a very small gap occurs, it will not affect the finish of laser welding at all. In addition, secondary sheet metal material 17
There is no problem in the length even if there is some error between the secondary sheet metal materials. In short, it is sufficient that the primary cut surfaces 20 (21) and 22 (23) of the secondary sheet metal material 17 are parallel to each other. That is, the primary cutting plane 20 (21)
, 22 (2B) are parallel, the two sheet metal members 18 and 19 obtained by cutting the secondary sheet metal material 17 in the A direction have the same length, so these sheet metal members 18 and 19 It is sufficient to use them as a set as constituent elements of the press raw material.

Sheet metal members 18, 19°24.2 arranged as shown in Figure 2
5 is then laser welded in the same manner as before, but
Since there is no gap in the abutted portion, there is no risk of cracks or the like occurring in the welded portion even when the finished press material is press-formed.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment and can be modified in various ways. For example, the secondary cutting surface 28 cut into the secondary sheet metal material 17
does not have to be in exactly the same direction as the arrow A direction as shown in FIG. 1; for example, the secondary cut surface 28 may be made oblique as shown in FIG. 3. In this case, by turning over one of the sheet metal members 18 or 19, a symmetrical member can be obtained, which can be used for an inner panel of a back door, etc. Alternatively, as shown in FIG. 4, two or more secondary cut surfaces 29, 30 may be formed to produce three or more equal length sheet metal members 31 to 33.
For example, as shown in FIG. 5, these sheet metal members 31 to 33 are placed against other sheet metal members 24 and 25 to form an inner panel for a back door with two windows.

Further, in the present invention, the primary cutting surface 34 may be inclined slightly more than perpendicular to the supply direction A of the sheet metal material 16, as shown in FIG. 6, and the secondary cutting surface 35 may be inclined as shown in FIG. You may let them. The sheet metal members 18, 19 thus obtained can be turned over one side and together with the other sheet metal members 24, 25 constitute the inner panel shown in FIG. 7. Furthermore, it goes without saying that the present invention is not only applicable to sheet metal members for laser welding, but is generally applicable to all cases where sheet metal members of equal length are required.

(Effects of the Invention) As described above, the present invention obtains a secondary sheet metal material by cutting a sheet metal material fed in a certain direction linearly in a certain direction that intersects with the feeding direction. Since two or more sheet metal members are obtained by cutting along the supply direction while leaving the primary cut surface, both ends of the obtained sheet metal members are parallel to each other, and the distance between both ends of each sheet metal member is All lengths are the same, so when a frame-shaped press material is constructed by butting together a plurality of sheet metal members and laser welding, for example, by using the equal length sheet metal members obtained according to the present invention as an intermediate material, the length of the butt part can be increased. Gaps can be reliably eliminated, welding defects can be prevented, and the yield of pressed products can be significantly improved.

[Brief explanation of the drawing]

1 to 7 show embodiments of the present invention.
The figure is a perspective view showing the cutting state of sheet metal material, Figure 2 is a plan view of sheet metal members arranged on a surface plate, Figures 3, 4, and 6.
The figures are a plan view of the secondary sheet metal material, Figures 5 and 7, respectively.
The figure is a plan view similar to FIG. 2 using different sheet metal members. In addition, Fig. 8 to Fig. 10 show the prior art, Fig. 8 is a perspective view of a sheet metal member, Fig. 9 is a perspective view of a sheet metal member during laser welding, and Fig. 10 is a press-formed product. FIG. 3 is a perspective view of the inner panel of the back door of the vehicle. 15...Sheet metal roll 16...Sheet metal material 17...Secondary sheet metal material

Claims (1)

[Claims] A sheet metal material supplied in a predetermined length in a certain direction is cut linearly in a certain direction intersecting the feeding direction to produce a secondary sheet metal material, and the secondary sheet metal material is cut along the feeding direction. A method for preparing a sheet metal member of equal length, in which at least two or more sheet metal members of equal length are obtained.