JPS59212186A - Cutting method of thin sheet - Google Patents

Abstract

PURPOSE:To cut the final cutting point of a thin sheet without cut, etc. of a product by cutting the sheet along the cutting shape, providing finally a projecting part to the cutting shape and cutting said sheet then cutting the projecting part along the cut surface. CONSTITUTION:The outside circumference 2 of a shin sheet 1 to be cut is held by an X-Y table 3 and a laser beam 10 is irradiated from a gas jet nozzle 4 through a bend mirror 7 and a condenser lens 8 along the cutting shape to cut the sheet to a circular product 5. A projecting part 6 is provided on one end side of the circular cutting shape and the circular part is completely cut in the stage of the above-mentioned cutting. The cutting part 12 which is the outside circumference of said projecting part 6 is finally cut from the sheet 1. The projecting part 6 provided to the product 5 is cut by laser melt-cutting or shearing, etc. along the cut surface 11 and the circular product 5 having good quality is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of cutting a thin plate by laser or the like. More specifically, the present invention relates to a thin plate cutting method for cutting a thin plate at a predetermined final cutting location.

As the prior art related to the present invention, there is a small one shown in FIGS. 1 and 2. FIGS. 1 and 2 show a cutting method for cutting a thin plate into a circular shape using a laser beam 10 irradiated from a gas jet nozzle 4. FIG. When cutting the thin plate 50 with the laser beam 10, the table 51
If the thin plate 50 is stacked on top of the thin plate 50 and cut by melting, the table 51 will also be cut, so a space 52 is provided in the table 51 and the outer periphery of the thin plate 50 is held around the space 52. It is fused. However, when the remaining connection portions 54 to be cut in a circular shape become less and less, the first
As shown in the figure, due to the weight of the cut product 53, the product 53 moves downward and the connecting portion 54 is bent.

If this happens, the connecting portion 54 cannot be maintained in a flat state, and will be fused so that the cutting portion cuts into the product. In addition, the final cut surface of the product 53 is fused into a wave shape and cannot be cut according to a predetermined 1" cut.

The present invention was made in view of the above-mentioned problems, and its purpose is to enable cutting without the cut surface cutting into the product side.

1) The technical means of the present invention to solve the problems described above are configured as follows. That is, a protrusion is provided in the fusing shape of the product to be cut from the thin plate (B, the protruding part side is cut last in fusing along the fusing shape of the thin plate,
Next, the protruding portion is cut off from the melt-cut product to obtain the product.

Therefore, even if the last fused part cuts into the product during fusing, it will only cut into the protruding part of the product, so if the protruding part is cut from the product after fusing, there will be no damage to the product. It can be cut without any incisions.

Hereinafter, one embodiment of the present invention will be described in detail based on the drawings. FIG. 3 shows a method for fusing the product of the present invention.

Product 5I relates to cutting during the final product, which is a metal gasket. The outer periphery 2 of the thin plate ′) to be melted is held on a table 3 that is movable in X-Y, and has a thin circular striped shape (with a protrusion 6 on one end). , the table 3 moves relatively along this fusing shape so that the gas jet nozzle 4 can move.

In laser fusing, a laser beam generated from an oscillator (not shown) is irradiated along a fusing shape as a laser beam 10 from a gas jet nozzle 4 through a pend mirror 7 and a condensing lens 8, thereby fusing. The laser beam 10 irradiated from the gas jet nozzle 4 along the melting shape of the thin plate 'l first irradiates the circular part and melts it, and after the circular part is completely melted, the laser beam 10 is applied to the protruding part 6. A fusing portion 12, which is the outer periphery of the thin plate 1, is cut by fusing from the thin plate 1. The shape of the protrusion 6 that is cut last is determined by the weight of the product 5, but since the protrusion 6 is cut from the product 5 last, it does not have a very large shape. Therefore, when the product 5 cannot be held substantially horizontally with only the protrusions 6 in a state where the circular portion is fused, it is desirable to provide the protrusions 6 at two symmetrical locations or three equally spaced locations on the product 5. After cutting the product 5 from the thin plate 1, the protrusion 6 provided on the product 5 is cut along the cutting surface 11 by laser cutting, shearing, or the like.

1) The fusing method of the present invention as described above has the following effects. The circular part is laser cut along the melted shape of the product 5, and finally the outer periphery of the protruding part 6 is cut by fusing, so the protruding part 6 side is slightly bent by the weight of the product 5 to conform to the melted shape of the protruding part 9. Even if it is not cut exactly as expected, the protrusion 6 is cut off from the product 5 in the final cut, so the thin plate 1
From this, the product 5 can be cut into a predetermined shape.

As a result, as a further effect, the outer peripheral part 2 of the large thin plate 1
It is now possible to hold a large number of products 5 on a table 3 and melt-cut a large number of products 5 from a thin plate 1. By manufacturing a large number of jigs for the deple 3 corresponding to the shape of the product 5 to be attached to the table 3, the thin plate 1 for each product 5 can be cut. This can be expected to have the effect of omitting the production and work of difficult jigs such as holding the parts in each jig.

[Brief explanation of the drawing]

Figure 1 is a side view without showing the conventional thin plate laser cutting method;
The figure is a plan view showing the fusing part of FIG. 1, FIG. 3 is a side view not showing the method of laser fusing a thin plate of the present invention, and FIG. 4 is a plan view showing the fusing part of FIG. 3. DESCRIPTION OF SYMBOLS 1... Thin plate, 2... Outer periphery, 3... Table, 4... Gas jet nozzle, 5... Product,
6...Protrusion part, 7...Pendomiror, 8...
Condenser lens, 9... Fused shape, 10... Laser beam, 11... Cut surface, 12... Fused part,
50...Thin plate, 51...Table, 52...
Blank space, 53...Product, 54...Connection part. Patent applicant Nippon Oil Seal Co., Ltd. Figure 7 Figure 2 Figure 3 447-1

Claims (1)

[Claims] 1. A protrusion (6) is provided in the fusing shape of the product (5) to be cut from the thin plate (1). A method for cutting a thin plate by fusing the side and then cutting the protrusion (6) from the product (5) along the cutting surface (11).