KR101525188B1 - Method and device for treating metal surface - Google Patents

Abstract

A step of rapidly heating the metal surface by laser irradiation so as to improve the toughness of the metal surface structure and further improve the impact resistance and fatigue resistance as well as the high strength due to the presence of residual stress, And a forging step of kneading the knitted fabric.

Laser beam, forging, rotary plate, beam hole, forging tool

Description

[0001] METHOD AND DEVICE FOR TREATING METAL SURFACE [0002]

The present invention relates to a method of treating a metal surface and a treatment apparatus. More particularly, the present invention relates to a metal surface treatment method and a treatment apparatus capable of treating a metal surface to improve surface characteristics such as high strength and abrasion resistance and impact resistance.

Heat treatment is performed in order to increase the strength of the metal surface and improve surface characteristics such as abrasion resistance and impact resistance.

Various techniques such as high frequency heat treatment, laser heat treatment, laser peening, shot blast peening, and ultrasonic texturing have been developed to improve the surface properties of metals.

However, most of the above-mentioned techniques have a disadvantage in that the surface hardening occurs only by rapid heating and quenching, and therefore, there is a high possibility that the impact resistance or fatigue resistance characteristics are lowered as the metal surface becomes stronger. Further, the toughness is lowered, causing a problem that the surface layer is peeled off due to vibration or external impact. Also, as the temperature rises, there is a disadvantage that good characteristics are easily lost.

There is provided a metal surface treatment method and a treatment apparatus capable of remarkably improving impact resistance and fatigue resistance as well as high strength by enhancing the toughness of metal surface texture by further making the metal structure finer and having residual stress.

For this purpose, the removal method may include a step of irradiating the metal surface with a laser to rapidly heat the metal surface, and a forging step of kneading the heated part.

As the two different energy sources are applied to the metal surface, the strength and toughness are improved.

On the other hand, the processing apparatus may include a laser portion for irradiating a laser beam onto the surface of the metal, and a forging portion for moving the heated portion to a heated portion for forging the laser beam.

The laser unit may include an oscillator for oscillating a laser beam and an optical unit for irradiating a laser beam emitted from the oscillator to a metal surface.

The forging unit may include a rotating plate having a beam hole through which a laser beam passes, a forging tool formed at a lower portion of the rotating plate for bending a metal surface, a rotating plate for moving the forging tool to a position of the beam hole, And a driving unit connected to the rotating unit to move the rotating plate up and down and to tap the metal surface with a forging tool.

Here, the rotating plate may have a structure in which the beam hole and the forging tool are formed within the same radius of rotation around the rotating shaft.

In addition, at least two or more beam holes and at least two or more forging tools may be alternately formed at intervals in the rotary plate.

Further, the forging tool may have a joint formed on its surface.

In addition, the forging tool may have a curved concavity and convexity on the surface thereof.

As described above, the heat treatment by the laser beam and the forging process improve the strength of the metal surface while improving the toughness of the surface texture, thereby improving the abrasion resistance and improving the impact resistance and fatigue resistance.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

The drawings are schematic and illustrate that they are not drawn to scale. The relative dimensions and ratios of the parts in the figures are shown exaggerated or reduced in size for clarity and convenience in the figures, and any dimensions are merely illustrative and not restrictive. And to the same structure, element, or component appearing in more than one of the figures, the same reference numerals are used to denote corresponding or similar features in other embodiments.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms as used herein include plural forms as long as the phrases do not expressly express the opposite meaning thereto. Means that a particular feature, region, integer, step, operation, element and / or component is specified, and that other specific features, regions, integers, steps, operations, elements, components, and / And the like.

Unless otherwise defined, all terms including technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Commonly used predefined terms are further interpreted as having a meaning consistent with the relevant technical literature and the present disclosure, and are not to be construed as ideal or very formal meanings unless defined otherwise.

The embodiment of the present invention described with reference to the perspective view specifically illustrates an ideal embodiment of the present invention. As a result, various variations of the illustration, for example variations in the manufacturing method and / or specification, are expected. Thus, the embodiment is not limited to any particular form of the depicted area, but includes modifications of the form, for example, by manufacture. For example, the regions shown or described as being flat may have characteristics that are generally coarse / rough and nonlinear. Also, the portion shown as having a sharp angle may be rounded. Thus, the regions shown in the figures are merely approximate, and their shapes are not intended to depict the exact shape of the regions, nor are they intended to limit the scope of the present invention.

Hereinafter, this embodiment will explain the surface treatment for the rolling roll as an example. The present treatment method and treatment apparatus are not limited to rolling rolls and are applicable to surface treatment of various metals.

Fig. 1 is a perspective view showing the construction of the present apparatus, and Fig. 2 is a side view of the present apparatus.

According to the above drawing, the apparatus includes a laser part for heating and irradiating a laser beam onto the surface of the rolling roll 100, and a forging part for moving the heated part to a heated part for forging the laser part do.

The present apparatus has a structure in which the surface of the rolled roll 100 irradiated immediately after the irradiation of the laser beam is forged, and the laser portion and the forged portion are organically bonded.

The forging unit includes a rotary plate 10 having a beam hole 12 through which a laser beam passes, a forging tool 14 formed at a lower portion of the rotary plate 10 for bending a metal surface, A rotating unit 20 for moving the forging tool 14 to a position of the beam hole 12 by rotating the rotating plate 10 to move the forging tool 14 up and down, And a driving part 22 for bending the metal surface.

The rotary plate 10 is formed of a disk structure, and a circular beam hole 12 is formed through the front surface so that a laser beam can pass through the outer periphery. A shaft 16 is vertically installed at the center of the rotary plate 10. And has a structure in which the rotary plate 10 rotates around the shaft 16.

As shown in FIG. 3, in the present embodiment, four beam holes 12 are formed, and are disposed at an angle of 90 degrees about the axis 16. A forging tool 14 for bending the surface of the rolling roll 100 is provided at a lower portion of the rotary plate 10. In the present embodiment, four forging tools 14 are provided and are disposed between the beam holes 12. The number of the beam holes 12 and the number of the forging tools 14 may be four, two or three or more than four, and is not particularly limited.

The forging tool 14 is positioned within the same radius of rotation as that of the beam hole 12 about the axis 16 of the rotary plate 10. This is for accurately positioning the forging tool 14 at the laser beam irradiation position through the beam hole 12 when the rotary plate 10 is rotated.

The driving unit 22 and the rotary unit 20 are connected to the shaft 16 of the rotary plate 10. The driving unit 22 is connected to the shaft 16 and moves the original plate up and down with respect to the surface of the rolling roll 100 via the shaft 16. The driving unit 22 may include a driving cylinder connected to the shaft 16. The driving unit 22 can be applied without particular limitation on the structure in which the shaft 16 is moved in the vertical direction.

The rotary unit 20 is for rotating the rotary plate 10 about the axis 16. The rotary unit 20 is connected to the driving unit 22 to rotate the rotary unit 10 and the rotary unit 10 connected to the driving unit 22. Of course, in addition to this structure, only the rotary plate 10 can be rotated separately from the drive portion 22. [ The rotary part 20 may be a structure using the rotational force of the driving motor and is not particularly limited.

Accordingly, when the rotary unit 20 is operated, the rotary plate 10 is rotated about the axis 16 to move the beam hole 12 and the forging tool 14 for laser beam irradiation to a desired working position.

The forging tool 14 has a structure in which the processing surface contacting the surface of the rolling roll 100 has a planar structure and the joint 18 is formed on the processing surface of the plane. As described above, the surface roughness can be made uniform by striking the surface of the roll with the forged tool 14 having the joint 18 formed thereon. Therefore, it is possible to secure a high strength and a constant surface roughness in the rolling roll 100, and to maintain the quality of the product uniformly. Further, after the use of the rolled green roll 100, the surface is processed through the heating by the laser beam and the forging by the forging tool 14, thereby enabling repeated reuse.

In addition to the above-described structure, as shown in Fig. 4, a concavo-convex portion 19 may be formed in which the working surface of the forging tool 14 has a curved shape. The forging tool 14 having such a structure can be used for surface treatment for securing hardness and toughness to a general metal other than the rolling roll 100. [

The laser unit may include an oscillator 30 for oscillating a laser beam and an optical unit for irradiating a laser beam emitted from the oscillator 30 to a metal surface.

The optical unit includes a condenser lens 34 positioned at a position above the beam hole 12 of the rotating plate 10 to condense the laser beam and a condenser lens 34 for guiding the laser beam emitted from the oscillator 30 to the condenser lens 34 And a reflector 32.

The laser beam emitted from the oscillator 30 is guided to the condenser lens 34 by the reflection plate 32 and is directed to the surface of the roll 100 by the condenser lens 34. At this time, the laser beam passes through the beam hole 12 formed in the rotary plate 10 through the condenser lens 34.

Hereinafter, the operation of the device and the process of treating the metal surface will be described with reference to FIGS. 5 and 6. FIG.

The surface treatment of the rolling roll 100 according to the present embodiment is performed by repeating the steps of heating the surface of the rolling roll 100 with a laser beam and forging the heated surface with the forging tool 14 .

The surface heating process by the laser beam is as follows. When the laser beam is emitted from the oscillator 30, the laser beam is irradiated perpendicularly to the surface of the rolling roll 100 through the reflection plate 32 and the condenser lens 34. The laser beam irradiated in a state in which the beam hole 12 is moved below the condenser lens 34 is passed through the beam hole 12 to the exposed surface of the rolling roll 100 through the rotating plate 10, .

As shown in FIG. 6, the irradiation of the laser beam is performed with a time difference. Then, the forging process by the forging tool 14 is continued at the surface cooling point after irradiation of the laser beam.

When the irradiation of the laser beam is completed, the rotary unit 20 is driven to rotate the rotary plate 10 in one direction.

When the rotary plate 10 is rotated about the axis 16, the forging tool 14 moves to the position irradiated with the laser beam. This is because the beam hole 12 and the forging tool 14 are located at the same radius of rotation about the axis 16. So that the forging tool 14 is positioned exactly on the heated surface for the laser beam.

When the rotation unit 20 stops driving, the driving unit 22 is operated to reciprocate the rotation plate 10 up and down. Therefore, the forging tool 14 provided at the lower part of the rotary plate 10 is forged by forging the surface of the rolling roll 100 heated by the laser beam.

The forging process is performed in a cooling process after the surface temperature of the rolling roll 100 is raised by the laser beam as shown in FIG. When the surface temperature of the rolling roll 100 is lowered, a heat treatment process is performed again by irradiating the laser beam. At this time, the rotation plate 10 is rotated again according to the driving of the rotation unit 20 to align the beam hole 12 with the position of the condenser lens 34.

By repeating the above-described process, the surface temperature of the rolling roll 100 is rapidly increased, and when the irradiation of the laser beam is finished, excellent surface characteristics can be obtained by striking the metal surface during cooling by the forging tool 14.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Of course.

1 is a schematic perspective view showing a configuration of a metal surface treatment apparatus according to the present embodiment.

2 is a side view of the metal surface treatment apparatus according to the present embodiment.

3 is a plan view showing a lower portion of a rotating plate of the metal surface treatment apparatus according to the present embodiment.

4 is a schematic cross-sectional view showing another embodiment of the present forging tool.

5 is a schematic view for explaining the operation of the metal surface treatment apparatus according to the present embodiment.

6 is a graph showing the laser beam irradiation and forging time zones of the metal surface treatment apparatus according to the present embodiment.

Description of the Related Art [0002]

10: spindle 12: beam hole

14: Forging tool 16:

18: joint 20:

22: driving unit 30: oscillator

32: reflector 34: condenser lens

Claims (8)

A laser part for irradiating a surface of the metal with a laser beam; and a forging part for moving the heated part to a heated part irradiated with the laser beam by the laser part, A forging tool formed at a lower portion of the rotating plate for bending a metal surface; a rotating unit for rotating the rotating plate to move the forging tool to a position of the beam hole; And a driving unit connected to the rotating unit and moving the rotating plate up and down to be able to hit a metal surface with a forging tool. The method according to claim 1, Wherein the laser unit includes an oscillator for oscillating a laser beam and an optical unit for irradiating a laser beam emitted from the oscillator to a metal surface. delete 3. The method according to claim 1 or 2, Wherein the rotating plate is formed in the same radius of rotation as the beam hole and the forging tool about the pivot axis. 3. The method according to claim 1 or 2, Wherein the rotary plate has at least two or more beam holes and at least two or more forging tools formed alternately at intervals. 6. The method of claim 5, Wherein the forging tool is further provided with a joint on a machined surface contacting the metal surface. 6. The method of claim 5, Wherein the forging tool has a concavo-convex portion bent in a corrugation on a machined surface contacting the metal surface. delete

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