JPS61139682A - Formation of alloy on metallic surface with laser - Google Patents

Abstract

PURPOSE:To form simpliy an alloy at the required part of the surface of a base metal by grinding the part, putting metallic powder in the resulting recess, and irradiating laser light. CONSTITUTION:The part of the surface of a base metal such as iron or Al at which an alloy is formed is ground, powder of a metal to be alloyed such as Mo, Cr, Ni, Ti or W is put in the resulting recess, and laser light is irradiated to form an alloy layer consisting of the metal and part of the base metal by heating and melting. It is made unnecessary to stick the metallic powder to the surface of the base metal with a binder resin by utilizing the recess, and the alloy layer can be simply formed at the required part of the surface of the base metal in a short time.

Description

[Detailed description of the invention] [Industrial application field] TECHNICAL FIELD The present invention relates to a method for alloying metal surfaces using a laser.

[Conventional technology]

A method of alloying specific parts of a metal member to improve its wear resistance, etc. is well known.

One of such alloying treatment methods is a method using laser light. In this laser processing method, metal or alloy powder is hardened with a binder resin and fixed to the part of the metal member to be alloyed, and then a laser beam is irradiated from above to melt the powder and alloy the surface of the metal member. form a layer. The reason why the powder is fixed with a binder resin is to prevent the powder from scattering due to laser beam irradiation or assist gas.

[Problem that the invention seeks to solve]

As described above, the conventional laser alloying method has the disadvantage that the powder must be fixed in advance with a binder resin to prevent scattering, and furthermore, the time required for alloying is long. The present invention seeks to provide a method for alloying metal surfaces using a laser that does not have these drawbacks.

[Failure to solve the problem]

As a result of intensive research, the present inventor has found that the above object can be achieved by applying a sharpening process to the surface of the metal f) material, supplying metal or alloy powder to the formed recesses, and then irradiating the laser beam. This discovery led to the completion of the present invention.

The present invention involves dressing the surface of the metal base material to be alloyed, supplying metal or alloy powder to the recesses of the dressing, and irradiating laser light to the raised parts and the recessed parts of the dressing. This is a metal surface alloying method using a laser, which is characterized in that the supplied metal or alloy powder is melted and alloyed together.

The sharpening recess has a depth of 0.5 to 3 mm, and a rl of 0.5 mm.
Approximately 1-2 mm is appropriate. A metal or alloy powder is supplied to this sharpening recess. It is desirable to first place the powder on the dressing area, and then press the powder with a pressure means such as a pressure roll to press the powder into the dressing recess. Adjust the size, number, and amount of powder of the recesses to obtain the desired alloyed layer thickness. The appropriate amount of powder is such that the dressing recesses are completely filled.

Next, the portion to which the powder has been supplied in this manner is irradiated with laser light to melt and alloy the sharpening convex portion of the base material and the powder filled in the concave portion.

The method of the present invention applies any alloying element to any metal base material, for example, a ferrous base material such as steel or an aluminum alloy material.
For example, it is extremely useful for forming alloyed layers by adding Mo, Cr, N1XW, Ti, etc.

[Effects of the Invention] According to the present invention, laser processing can be performed by directly supplying metal or alloy powder to the dressing metal surface, and there is no need for fixing with a resin binder as in the conventional method.

Therefore, there is no risk of gas defects occurring due to combustion of the binder resin.

Furthermore, since the metal or alloy powder is held in the sharpening recess, it will not scatter even if it is irradiated with laser light.

Furthermore, since the convex portions of the sharpening are easily heated and melted at the same time as the powder, alloying is carried out quickly at a relatively low temperature. This improves alloying properties. The thickness and properties of the alloyed layer formed are determined by the size, number, and number of recesses in the dressing.
and the amount of powder supplied, etc.
Since the method of the present invention substantially prevents powder scattering,
It is possible to reliably form an alloyed layer having uniform texture and properties at all times.

〔Example〕

Thickness 1-. 6mm, height 100tlltTl, width 80mm
The surface of the high tensile strength steel plate was subjected to a sawtooth-like sharpening process, and recesses were formed with a depth of 1 mm, grooves rl] 0.5 mm, 1]l Q mm, and an interval between grooves 0.7 mm. 100 Metsushini MO powder was placed on this dressing portion and pressed with a pressure roll to press the powder into the dressing recess. From above this
Output/lkw, laser beam diameter IQmm, operation speed 0.
Laser light was irradiated at 3 m/min. A uniform alloyed layer was formed without powder scattering at all.

Claims (1)

[Claims] The part to be alloyed on the surface of the metal base material is dressed, a metal or alloy powder is supplied to the recesses of the dressing, and a laser beam is irradiated to create the convex parts of the dressing and the metal or alloy powder supplied to the recesses of the dressing. A metal surface alloying method using a laser, which is characterized by melting together with alloy powder to form an alloy.