JPS6247631B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a laminated mold by laser processing.

The method of cutting out punches or dies from a plate-like material using a laser beam and stacking them to make a mold has been known for a long time. Since they are stacked and fixed and used as is as a punch or die, the cutting edge wears out in a short period of time, so its use has been limited to the production of molds for small quantity production. In addition, when cutting out a punch or die from a material using a laser, the conventional cutting method is to cut out a punch or die from a material along a closed curve F or F' representing the shape of the punch or die from point S, as shown in FIG. 1a or b. Then, cut in the direction of the arrow and end at point E, where the closed curve is reached again. According to this method, since the point E on the closed curve is heated twice by the laser beam, there is a greater tendency for the point E on the closed curve to be melted and removed more than other parts, resulting in inaccurate punch or die shapes and There were inconveniences such as "burrs" appearing on the removed product.

This invention was made to eliminate the above-mentioned drawbacks, and an object thereof is to provide a method for manufacturing a laminated mold with a long life and high accuracy.

Next, embodiments of the present invention will be described with reference to the drawings. If the finished shape of the punch or die is a closed curve F or F' such as a or b in FIG. 2, hardening is performed using a laser beam along the closed curves indicated by dotted lines similar to these curves. In this case, the diameter of the laser beam is made larger than when cutting, and its power and moving speed are reduced to ensure that the laser beam is scorched to the appropriate width and depth.

For the material that has been hardened, set the cutting start point S and end point E in the part of the material that will become the cutting scraps, as shown in Figure 3a and b, and cut the above-mentioned closed curve F in the direction of the arrow from the starting point S. Alternatively, the laser beam cuts along F', and the cutting ends at the end point E.
That is, unlike the conventional cutting method, the closed curve F or
Just before going around F', it is cut so as to leave a small uncut part C (approximately 1 millimeter), and the laser beam acts twice on the closed curve that represents the finished shape, causing excessive melting and removal of some parts. avoid being carried out.
Then, the uncut portion C is removed and finished using a mechanical method (or a file or the like). Therefore, punches or dies with precise shapes are manufactured. In this example, the reciprocating cutting lines of the laser beam are parallel at the non-cutting portion C of the laser cutting, but other examples in which the cutting lines intersect are shown in FIGS. 4a and 4b.

The distribution of the hardened layer produced on the material by laser beam hardening and cutting is shown in FIGS. 5a and 5b. A is a cross section of a punch prepared according to this example, in which a wide and deep hardened layer H exists on the cutting edge due to quenching before cutting. h is a hardened layer produced by laser cutting. Figure b is a cross section of a punch manufactured by the conventional method.
h is a hardened layer formed by laser cutting as in Fig. a, and is particularly narrow and shallow at the cutting edge.

The processing machines used in this implementation include:
It is appropriate to use an NC device in that the same program can be used for punches and dies that are linearly symmetrical, and an auxiliary function of the NC device called mirror image can be used, but this is not limiting.

As can be understood from the above description of the embodiments, the gist of the present invention is as stated in the claims. When cutting out a punch or die, a laser beam is used to harden the punch or die along a closed curve representing the finished shape of the punch or die, and then the laser beam is hardened on the closed curve to avoid the laser beam acting on the closed curve multiple times. A non-cutting portion is provided. Then, a cut is made with a punch or a die at a position avoiding the closed curve, and then the uncut portion is machined to form the closed curve into the finished shape.

Therefore, according to the present invention, the number of machining steps is increased in addition to laser processing, but since the laser beam does not act multiple times on the closed curve indicating the finished shape of the punch or die, The punch or die can be finished with high precision without being partially melted and removed excessively.

[Brief explanation of the drawing]

Figures 1a and b show a conventional method for cutting a mold using a laser beam, Figures 2a and b show a hardening method using a laser, and Figures 3a and b, and Figures 4a and b show the laser beam of the present invention. It is an explanatory view showing a cutting method by.
FIG. 5 is an explanatory diagram showing the distribution of the hardened layer in the cross section of the punch. (Explanatory diagram of the symbols representing the main parts of the drawing), 1
...Mold material, C...Uncut portion, F, F'...
closed curve.

Claims (1)

[Claims] 1 When using a method of cutting laminated molds by laser processing and cutting out the shape of a punch or die in a plate-shaped material using a laser beam, the laser beam is used to pre-quench the punch or die along a closed curve that represents the finished shape of the punch or die. Thereafter, the laser beam is prevented from acting on the closed curve multiple times, and cutting is performed with a punch or die at a position that avoids the closed curve by providing a non-cutting portion on the closed curve, A method for manufacturing a laminated mold by laser processing, characterized by mechanically processing the uncut portion to form a punch or die into the finished shape.