JPS63108930A - Manufacture of metallic die - Google Patents

Abstract

PURPOSE:To prevent the separation of a hardened layer and to obtain the die of long service life at low cost by coating a sintered hard material after forming the die surface in a rough face by a laser light. CONSTITUTION:The laser light oscillated from a YAG laser oscillator 4 is projected via a laser nozzle head 6 on the surface 3 of the punch 2 of a press die 1, and a very small unevenness is uniformly formed on the surface 3 of the punch 2. The die 1 is then set inside a container 7. The sintered hard material 8 of a TiC, etc. is set inside the container 7, the heater 9 heating this material 8 is provided as well and the lead-in port 10 and air exit 11 of a gas are formed in the container 7. The die 1 is then connected to the electrode of one part and the material 8 to the electrode of the other part, the pressure inside the container 7 is reduced, the material 8 is heated by the heater 9 as well to be ionized and is subjected to vapor deposition to the punch surface 3 of the die.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a method for manufacturing a mold, and particularly to a method for manufacturing a mold used in press working, such as a punching mold. It is something.

(Prior art) In order to mass produce parts for various machines and equipment, coiled materials, fixed length materials, sketch materials, etc. are used.
Pressing methods such as punching, bending or deep drawing are widely used.

The lifespan of the molds used in these various types of press working is a problem, as is the case with working tools used in general machining methods.

Therefore, for example, in punching dies, dies in which the tool that comes into direct contact with the material is made of alloy tool steel or cemented carbide material with excellent wear resistance are widely used.

Deep drawing dies use materials such as cast iron as tool materials.

Whether it is a punching die or a deep drawing die, contact between the tool and the material is unavoidable, so in order to extend the life of the tool and prevent surface damage to the tool and material as much as possible, it is important to not only select the tool material. , the technology of coating the tool surface with a hard material is becoming widespread.

Among these techniques, for example, TD processing, CVD processing, etc. are widely used. The treated blade is a method in which various carbides such as TiC are chemically deposited on the tool surface, and only the tool surface can be made extremely hard. This significantly extends tool life.

However, since the treatment method is a chemical vapor deposition method,
It is necessary to heat the tool material at a high temperature (approximately 1000° C. or higher) for a long time, and the metallic properties of the tool base material change, so there are restrictions on the materials that can be used. For example, high-speed steel is difficult.

In addition, thermal distortion occurs, so it cannot be applied to precision molds.

In order to overcome these drawbacks, physical vapor deposition methods such as ion brating have begun to be applied.

This involves heating and ionizing the compound to be vapor deposited, applying it to a target (in this case, a mold), and forming a film on the tool surface. At a relatively low temperature (from room temperature to about 5
00°C or lower), the properties of the tool base material do not change much, and it has the advantage of being applicable to a wide range of subjects and causing less distortion.

(Problems to be Solved by the Invention) Although the ion plating method has the above-mentioned advantages, the ion plating method physically deposits a hardened layer, so it cannot be said to be sufficient in terms of peel strength. In particular, if there is an oil film on the mold surface, it will peel off easily. Therefore, it is possible to roughen the surface of the mold by applying a grinder to the surface of the mold before ion plating, but it is not possible to achieve a uniform roughness, and since the grinder has directionality, There is a problem that it is easy to peel off.

Therefore, an object of the present invention is to provide a method for forming a hardened layer on a mold surface that is not affected by the mold material and is difficult to peel off.

[Structure of the invention]

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention irradiates the surface of a mold with a pulse of laser light to form minute irregularities on the surface of the mold, and then The surface is coated with a highly hard material using the ion-blating method.

(Function) According to the present invention, the mold surface becomes a uniform rough surface by pulse irradiation with laser light, and this rough surface is coated with an ultra-hard material by ion plating, so that the hardened layer formed can be peeled off. Increases strength.

(Example) Embodiments of the present invention will be described below with reference to the accompanying drawings.

First, in the present invention, as shown in FIG. irradiate. Since this laser beam is oscillated by the oscillator 4 by pulse oscillation, minute irregularities are uniformly formed on the surface 3 of the punch 2 as shown in FIG.

The height and period of the unevenness are determined by the laser output, pulse interval,
Although it varies depending on the moving speed of the laser nozzle head 5, etc., unevenness of about 1 micron (μ) to about 10-odd microns (μ), where the effect of the present invention is expected, can be easily solved by setting appropriate processing conditions. can be obtained.

Furthermore, once the conditions are set, it is possible to form exactly the same minute unevenness over the entire surface of the workpiece. Therefore, it is possible to achieve a uniform and beautiful surface condition that is incomparable to, for example, manual grinding work.

Furthermore, according to the grinding operation, the coating material is difficult to peel off in the direction perpendicular to the grinding marks, but it is easy to peel off along the grinding marks. The fine irregularities formed by the laser are random in direction, and there is no particular direction in which the coating material is likely to peel off.

It is also possible to use a CO2 laser instead of a YAG laser as a laser oscillator, but with a CO2 laser,
It is difficult to form minute irregularities without causing waviness on the surface of the workpiece, and since the price is stable, it is most appropriate to apply a YAG laser.

In order to achieve the object of the present invention, it is sufficient to use a YAG laser with an output of about 100 W. Further, in order to form fine irregularities, it is desirable that the laser oscillator be able to output pulses up to several tens of kilohertz (kllz), and from this point of view as well, a YAG laser is suitable.

Furthermore, when the laser beam is irradiated, not only minute irregularities are formed on the surface 3 of the punch 2, but also dirt such as oil is evaporated and scattered by the light heat of the laser beam, and the surface condition of the workpiece is changed. It has the advantage of being extremely clean.

The processing process using the laser beam described above can be easily automated by, for example, having a robot hold the laser nozzle head 5.

After the surface 3 of the punch 2 of the mold 1 has been roughened as described above, the mold 1 is set in a container 7 as shown in FIG. An ultra-hard material 8 such as TiC is set in the container 7, and a heater 9 for heating the material 8 is provided.The container 7 is further formed with a gas inlet 10 and an exhaust port 11.

Then, by connecting the mold 1 to one electrode and the ultra-hard material 8 to the other electrode, reducing the pressure inside the container 7 and heating the ultra-hard material 8 with the heater 9, the ultra-hard material is ionized and the mold is molded. Steam the punch surface 3.

As another embodiment of the present invention, after the surface of the mold tool base material is once hardened by a conventional method such as nitriding or carburizing,
It is also conceivable to irradiate the surface of the mold with a pulse of laser light to form minute irregularities on the surface of the mold, and then coat the surface of the mold with an ultra-hard material by an ion-blating method. In this case, not only the mold surface but also the base material immediately below the surface is hard, so it is generally difficult to grind a mold tool with better impact resistance and wear resistance. A method of forming irregularities by laser irradiation is effective.

(Effects of the Invention) As explained above, according to the present invention, when forming a hardened layer by the ion plating method, which is not affected by the mold material, the hardened layer is formed after the mold surface is roughened with a laser beam. Therefore, it is possible to provide a mold with a long life at a low cost without causing the cured layer to peel off.

[Brief explanation of the drawing]

Figure 1 shows the mold surface being irradiated with laser light, Figure 2 is a diagram showing the unevenness of the mold surface, and Figure 3 shows ion plating applied to the mold surface. It is a figure showing a state. 1... Mold, 2... Punch, 3... Punch surface,
4...Laser oscillator, 8...Super hard material.

Claims (1)

[Claims] A mold characterized in that the mold surface is made into a rough surface with minute irregularities by irradiating pulses of laser light onto the mold surface, and then the mold surface is coated with an ultra-hard material by an ion plating method. manufacturing method.