JP4865830B2 - Metal surface modification method - Google Patents

Description

  The present invention relates to a method for surface modification of a metal using a rotary tool.

  For example, JP 7-505090 A (Patent Document 1) discloses a novel method for joining long materials as a solid phase joining method by friction stirring. In this joining method, frictional heat generated between the rotary tool and the workpiece is obtained by inserting a rotary tool made of a material substantially harder than the workpiece into the butt portion of the workpiece and moving the rotary tool while rotating. Discloses a method of joining workpieces by plastic flow. In this stir welding method, since the joining member can be joined in a solid phase state while integrating the softened solid phase portion that is moved while rotating the rotary tool, there is no thermal distortion and the joining direction is substantially reduced. There is an advantage that even infinitely long materials can be continuously solid-phase bonded in the longitudinal direction. Furthermore, since the solid-phase bonding utilizing the plastic flow of metal caused by frictional heat between the rotary tool and the bonding member, bonding can be performed without melting the butt portion. Further, since the heating temperature is low, deformation after joining is small. Since the butt portion is not melted, there are many advantages such as fewer defects.

  Japanese Patent Application Laid-Open No. 10-225781 (Patent Document 2) moves the rotary tool while heating the front portion of the abutting portion in the moving direction of the rotating tool with an external heat source, for example, a laser beam. A method is disclosed. According to Patent Document 2, it is possible to perform good bonding without causing poor bonding even in a situation where frictional heat is likely to disperse, and to improve the bonding speed.

  Japanese Patent Laying-Open No. 2004-154790 (Patent Document 3) also discloses that, as in Patent Document 2, in order to improve the stirrability of the joining member by the rotating tool, the joining member is used by using high-frequency heating before joining by the rotating tool. Heating.

JP 7-505090 Gazette Japanese Patent Laid-Open No. 10-225781 JP 2004-154790 A

  In the inventions disclosed in Patent Document 2 and Patent Document 3, since there is a distance between the rotary tool and the laser heating position or the high-frequency heating position, the heated portion is cooled when bonded, and the heating effect is low. Furthermore, in this method, only the surface of the joining member is heated, and it is difficult to heat the inside of the joining member. For this reason, a temperature difference occurs in the plate thickness direction, and uniform bonding may be difficult.

  Patent Documents 1 and 2 have a problem that the heating effect is small because a heat input means such as a laser beam or high-frequency heating is provided in front of the moving direction of the rotary tool. However, the present inventors have confirmed that if a rotating tool is used, the surface of the metal can be modified without heating by the heat input means.

The present invention integrates a small-diameter portion that processes a processing object by rotating in a state inserted in the processing object made of metal, and presses the processing object while the small-diameter portion is processing. The surface of the object to be processed is modified by a rotating tool having a large diameter portion that is made to face the rotating tool and before the small diameter portion is inserted into the processing object. The processing object is irradiated with a laser beam that has passed through the through-hole formed in the substrate, and the large-diameter portion is pressed against the processing object, so that a part of the pressed large-diameter portion is built up on the processing object. Provided is a method for surface modification of a metal to be produced.

  According to the present invention, a metal surface modification treatment can be performed using a rotary tool.

It is a figure for demonstrating a 1st reference example, Comprising: It is a figure which shows the state before inserting a rotary tool in a joining member. It is a figure for demonstrating a 1st reference example, Comprising: It is a figure which shows the state after inserting a rotary tool in a joining member. It is a figure which shows the structure outline | summary of the stir welding apparatus by a 1st reference example. It is a figure which shows the form of the laser beam applied to a 1st reference example. It is a figure which shows the other form of the laser beam applied to a 1st reference example. It is a figure for demonstrating a 2nd reference example, Comprising: It is a figure which shows the state before inserting a rotary tool in a joining member. It is a figure for demonstrating a 2nd reference example, Comprising: It is a figure which shows the state after inserting a rotary tool in a joining member. It is a figure which shows the state which is irradiating the laser beam in the 2nd reference example. It is a figure which shows the state which has stopped irradiation of the laser beam in the 2nd reference example. It is a figure explaining the irradiation method of the laser beam by the 2nd reference example. It is a figure for demonstrating a 3rd reference example, Comprising: It is a figure which shows the state before inserting a rotary tool in a joining member. It is a figure for demonstrating the 3rd reference example, Comprising: It is a figure which shows the state after inserting a rotary tool in a joining member. It is a figure for demonstrating a 3rd reference example, Comprising: It is a figure which shows the other state after inserting a rotary tool in a joining member. It is a figure which shows the irradiation pattern of the laser beam in a 3rd reference example. It is a figure for demonstrating a 4th reference example, Comprising: It is a figure which shows the state before inserting a rotary tool in a modifying member. It is a figure for demonstrating the 4th reference example, Comprising: It is a figure which shows the state after inserting a rotary tool in a modifying member. It is a figure for demonstrating the modification of a 4th reference example, Comprising: It is a figure which shows the state after inserting a rotary tool in a modification | reformation member.

Hereinafter, the present invention will be described in detail based on embodiments shown in the accompanying drawings.
<First Reference Example>
1 and 2 are views for explaining a first reference example for the present invention. FIG. 1 is a view showing a state before the rotary tool 1 is inserted into the joining member 5, and FIG. It is a figure which shows the state after inserting in the joining member 5. FIG. FIG. 1 is a view seen from the front in the moving direction of the rotary tool 1, and FIG. 2 is a view seen from the side of the moving direction (indicated by an arrow) of the rotary tool 1.
1 and 2, the rotary tool 1 is composed of a cylindrical large diameter portion 2 and a small diameter portion 3. The large-diameter portion 2 and the small-diameter portion 3 are integrally formed from a tool material such as die steel, and a through hole H1 is formed on the rotation shaft thereof. The rotary tool 1 is rotated around a rotation axis by a rotation driving means (not shown). Further, the rotary tool 1 can be moved in the plane direction and the vertical direction in the drawing by a moving means (not shown).
A laser beam L oscillated from a laser oscillator (not shown) passes through a through hole H <b> 1 formed including the rotation axis of the rotary tool 1 and is irradiated to the bonding member 5. Therefore, the laser beam L is applied to the bonding member 5 within the projection plane of the rotary tool 1.

  As shown in FIG. 1, before the rotary tool 1 is inserted into the bonding member 5, the laser beam L is applied to the bonding member 5 when the rotary tool 1 faces and is separated from the bonding member 5. . The laser beam L is applied to the abutting portion 6 between the joining members 5. Accordingly, the portion of the joining member 5 irradiated with the laser beam L and its vicinity A1 are softened by heating and heating, so that the load when the rotary tool 1 is inserted into the joining member 5 can be reduced.

  After irradiating the laser beam L for a predetermined time before inserting the rotary tool 1 into the joining member 5, the rotary tool 1 is inserted as shown in FIG. In the first embodiment, the laser beam L is continuously irradiated even after the rotary tool 1 is inserted into the joining member 5. As a result, a temperature lower than the central portion of the joining member 5 in the thickness direction (indicated by A3 in the figure) can be heated. This portion is a portion that is not or hardly affected by the thermal effect of the small diameter portion 3 of the rotary tool 1. Therefore, according to the first embodiment, as shown by A2 in FIG. 2, a good joining state can be obtained over the entire thickness direction of the joining member 5, and joining is performed as compared with the conventional stirring joining method using only a rotary tool. Defects can be reduced. Moreover, since the rotary tool 1 is moved while irradiating the laser beam L, the moving speed can be increased as compared with the stirring joining method using only the rotary tool 1.

FIG. 3 shows a schematic configuration of the stir welding apparatus 10 for carrying out the stir welding method according to the first reference example.
The stir welding apparatus 10 according to the first reference example includes a base 11 on which the bonding member 5 is placed. Rails 12 are disposed on the left and right sides of the base 11. A gantry 13 capable of reciprocating in the Z direction on the rail 12 is provided, and the rotary tool 1 is attached to the gantry 13 via a motor 14. The motor 14 rotationally drives the rotary tool 1. The motor 14 is attached to the gantry 13 so as to be movable in the X direction and the Y direction.
The stir welding apparatus 10 includes a laser oscillator 15. The laser beam L emitted from the laser oscillator 15 is applied to the bonding member 5 through the optical fiber 16 and the rotary tool 1.

When the joining member 5 is joined by the stir welding apparatus 10, first, the two joining members 5 are arranged with their butted portions 6 butted. Thereafter, the rotary tool 1 is aligned with the butting portion 6 of the joining member 5 by adjusting the position of the gantry 13 and the position of the motor 14 with respect to the gantry 13.
When the positioning of the rotary tool 1 with respect to the abutting portion 6 is completed, the rotary tool 1 is rotated by driving the motor 14, and the laser oscillator 15 is driven to the joining member 5 as shown in FIG. Then, the laser beam L is irradiated. Thereafter, as described above, after the laser beam L is irradiated for a predetermined time, the rotary tool 1 is inserted into the abutting portion 6 of the joining member 5. Even after the rotary tool 1 is inserted, if irradiation with the laser beam L is continued as shown in FIG. 2, joint defects can be reduced as compared to the conventional stir welding method using only the rotary tool 1, and the rotary tool can be reduced. The moving speed can be increased as compared with the stir welding method using only one.

  In the above description, the irradiation of the laser beam L before and after insertion of the rotary tool 1 into the joining member 5 has been described as continuous. However, if the intended purpose by the irradiation of the laser beam L can be achieved, the irradiation of the laser beam L can be made intermittent. Further, the intensity of the laser beam L irradiated before and after insertion of the rotary tool 1 into the joining member 5 may be constant or may be varied. The intensity of the laser beam L can be changed before and after insertion into the bonding member 5.

  In the first reference example, the laser beam L applied to the bonding member 5 may be focused by the lens 17 so that the focal point coincides with the surface of the bonding member 5 as shown in FIG. it can. Further, as shown in FIG. 5, the laser beam L applied to the bonding member 5 may be configured to use a lens 18 and a lens 19 so that the surface of the bonding member 5 can be irradiated with a parallel beam.

<Second Reference Example>
Next, a second reference example for the present invention will be described.
In the first reference example described above, the laser beam L passes through the central axis of the rotary tool 1 to irradiate the laser beam L onto the joining member 5 in the projection plane of the rotary tool 1. A mode in which the laser beam L passes through a position eccentric from the central axis of the rotary tool 1 is disclosed.

6 and 7 are views for explaining a second reference example for the present invention. FIG. 6 is a view showing a state before the rotary tool 21 is inserted into the joining member 25. FIG. It is a figure which shows the state after inserting in the joining member 25. FIG. 6 is a view seen from the front of the moving direction of the rotary tool 21, and FIG. 7 is a view seen from the side of the moving direction of the rotary tool 21 (indicated by an arrow). FIG. 8 is a perspective view showing a state after the rotary tool 21 is inserted into the joining member 25.
6 and 7, each of the rotary tools 21 includes a cylindrical large diameter portion 22 and a small diameter portion 23. The large-diameter portion 22 and the small-diameter portion 23 are integrally formed from a tool material such as die steel, and an arc-shaped through hole H2 is formed at a position eccentric from the rotation axis.
A laser beam L emitted from a laser oscillator (not shown) passes through a through hole H <b> 2 formed in the rotary tool 21 and is irradiated to the bonding member 25. Accordingly, the joining member 25 is irradiated with the laser beam L within the projection plane of the rotary tool 21.

  Similarly to the first reference example, the second reference example is also before the rotary tool 21 is inserted into the joining member 25, as shown in FIG. The joining member 25 is irradiated with a laser beam L. The laser beam L is applied to the butting portion 26 between the bonding members 25. The irradiation with the laser beam L is performed from the small diameter portion 23 to the front in the moving direction of the rotary tool 21. Therefore, since the portion of the joining member 25 irradiated with the laser beam L and its vicinity A4 is heated and heated, the rotational tool 21 is inserted into the joining member 25 or the load when the rotational tool 21 is moved is reduced. Can do.

  Here, in the second reference example, since the through hole H2 is formed at a position eccentric from the rotation axis of the rotary tool 21, the laser beam L is not continuously irradiated as in the first reference example. That is, as shown in FIG. 8, the optical fiber F is fixed on the butting portion 26, and the laser beam L is irradiated only when the through hole H2 passes through this fixed position. On the other hand, as shown in FIG. 9, when the through hole H2 exists at a position different from the fixed position, the irradiation of the laser beam L is stopped. That is, in the second reference example, the laser beam L is intermittently emitted from the small diameter portion 23 to the front in the moving direction of the rotary tool 21 according to the position of the through hole H2.

  After irradiating the laser beam L for a predetermined time before inserting the rotary tool 21 into the joining member 25, the rotary tool 21 is inserted as shown in FIG. In the second embodiment, the laser beam L is intermittently irradiated even after the rotary tool 21 is inserted into the joining member 25. Accordingly, the moving direction of the rotary tool 21 and the front of the small-diameter portion 23 are softened, so that the moving load can be reduced. As a result, the moving speed can be increased as compared with the stir welding method using only the rotary tool 21.

  The example in which the irradiation position of the laser beam L is fixed has been described above, but by adopting the configuration shown in FIG. 10, the amount of eccentricity from the rotation axis of the rotary tool 21 without fixing the irradiation position of the laser beam L. The laser beam L can be irradiated on a circle having a radius of. That is, in FIG. 10, the laser beam L is guided to the through hole H2 of the rotary tool 21 by combining the mirror M1 and the mirror M2. The mirror M1 and the mirror M2 are configured to be rotatable about the mirror M1. The center of rotation coincides with the rotation axis of the rotary tool 21. When the rotational speed of the rotary tool 21 and the rotational speed of the mirror M1 and the mirror M2 are matched and the laser beam L is irradiated via the mirror M1 and the mirror M2, the laser beam L is circumferentially formed on the bonding member 25. Can be irradiated.

<Third reference example>
Next, a third reference example will be described.
The third reference example discloses a form in which the laser beam L passes through the center axis of the rotary tool and a position eccentric from the center axis. In the first reference example and the second reference example, the laser beam L is applied to the abutting portion 6 (26) of the bonding member 5 (25). In the third reference example, the laser beam L is irradiated to the bonding member 5 (25). 2) other than the butting portion 6 (26). By doing so, it is possible to stir and bond dissimilar materials having different melting points.

11 and 12 are diagrams for explaining a third reference example. FIG. 11 is a diagram showing a state before the rotary tool 31 is inserted into the joining member 35, and FIG. It is a figure which shows the state after inserting in. FIG. 11 is a view seen from the front in the moving direction of the rotary tool 31, and FIG. 12 is a view seen from the side of the moving direction (indicated by an arrow) of the rotary tool 31.
11 and 12, the rotary tool 31 includes a large diameter portion 32 and a small diameter portion 33. The large diameter portion 32 and the small diameter portion 33 are integrally formed of a tool material such as die steel. The rotary tool 31 has a through hole H3 formed on the rotation shaft thereof. Further, the rotary tool 31 has an arc-shaped through hole H4 formed at a position eccentric from the central axis.

  A laser beam L emitted from a laser oscillator (not shown) passes through the through holes H3 and H4 formed in the rotary tool 31 and is irradiated to the bonding member 35. Therefore, the laser beam L is applied to the bonding member 35 within the projection plane of the rotary tool 31.

  Similarly to the first and second reference examples, the third reference example is a stage where the rotary tool 31 is separated from the joining member 35 before the rotary tool 31 is inserted into the joining member 35 as shown in FIG. Thus, the joining member 35 is irradiated with the laser beam L through the through hole H3. Here, in the third reference example, for example, one joining member 35 is made of steel (hereinafter, joining member 35-1), and the other joining member 35 is made of an aluminum alloy (hereinafter, joining member 35-2). Different dissimilar materials are to be joined.

After irradiating the laser beam L for a predetermined time before inserting the rotary tool 31 into the abutting portion 36 of the joining member 35-1 and the joining member 35-2, the rotary tool 31 is inserted as shown in FIG. In the third reference example, irradiation of the laser beam L through the through hole H3 is continued even after the rotary tool 31 is inserted into the abutting portion 36 of the joining member 35-1 and the joining member 35-2. As a result, it is possible to raise the temperature of the portions (indicated by A8 in the figure) that are lower than the thickness direction center portions of the joining member 35-1 and the joining member 35-2. This portion is a portion that is not or hardly affected by the thermal effect of the small diameter portion 33 of the rotary tool 31.
Therefore, according to the third reference example, as shown in FIG. 12, a good joining state can be obtained over the entire thickness direction of the joining member 35, and joining defects are reduced as compared with the conventional stirring joining method using only a rotary tool. Can be reduced. Moreover, since the rotary tool 31 is moved while irradiating the laser beam L, the moving speed can be increased as compared with the stir welding method using only the rotary tool 31.

  In the third reference example, after the rotary tool 31 is inserted into the abutting portion 36 of the joining member 35-1 and the joining member 35-2, the laser beam L is irradiated to the joining member 35-1 through the through hole H4. To do. Therefore, the region indicated by A9 of the bonding member 35-1 is softened by the laser beam L. Here, as shown in FIG. 13, the through-hole H4 may be located in the region of the joining member 35-2. At this time, the irradiation of the laser beam L passing through the through hole H4 is stopped. That is, by controlling the irradiation of the laser beam L that passes through the through-hole H4, the temperature of the joining member 35-1 made of steel is heated, but the joining member 35-2 made of an aluminum alloy passes through the through-hole H4. The laser beam L is not heated. At this time, the joining member 35-2 made of an aluminum alloy is not directly heated and heated. Here, the softening temperature of the steel is about 800 ° C., and the softening temperature of the aluminum alloy is about 400 ° C. The difference in the softening temperatures makes it difficult to stir and join the two. However, in the third reference example, the joining member 35-1 is heated to a higher temperature than the joining member 35-2 made of aluminum alloy by irradiating the steel joining member 35-1 having a high softening temperature with the laser beam L. can do. Therefore, even if the softening temperatures of the objects to be joined are different, both the joining member 35-1 and the joining member 35-2 can be simultaneously softened by controlling the irradiation of the laser beam L passing through the through hole H4. Is possible.

In the above example, the irradiation of the laser beam L from the through hole H4 is stopped in the state shown in FIG. 13, but the present invention is not limited to this mode. For example, in the state of FIG. 13, the output energy of the laser beam L from the through hole H4 can be weakened. In that case, the irradiation pattern of the laser beam L has a pulse shape as shown in FIG.
In the third reference example, the laser beam L is irradiated from the through hole H3, that is, the rotating shaft of the rotating tool 31, but when only the stir welding of different materials is considered, the rotating tool 31 rotates. Irradiation of the laser beam L from the shaft can be omitted.

<Fourth reference example, first and second forms>
The first to third reference examples disclose examples in which the two joining members 5, 25, and 35 are abutted and joined while stirring, but the present invention is applied to surface modification of a metal material. You can also. Therefore, in the following, a form applied to surface modification of a metal material will be described.

  FIGS. 15 and 16 are diagrams for explaining a fourth reference example. FIG. 15 is a diagram illustrating a state before the rotary tool 41 is inserted into the reforming member 45, and FIG. It is a figure which shows the state after inserting in the member 45. FIG. 15 is a diagram seen from the front of the rotary tool 41 in the moving direction, and FIG. 16 is a diagram seen from the side of the rotary tool 41 in the moving direction (indicated by an arrow).

15 and 16, the rotary tool 41 is composed of a cylindrical large-diameter portion 43 and a small-diameter portion 42 . The large diameter portion 43 is composed of a build-up material with respect to the surface of the reforming member 45. As the build-up material, for example, a high Cr base alloy, a Ni base alloy, a Co base alloy, or the like can be used. The small diameter portion 42 is made of a tool material such as die steel. The large diameter portion 43 is shrink-fitted around the small diameter portion 42 and joined by other means. A through hole H5 through which the laser beam L passes is formed in the central axis of the large diameter portion 43 (the rotation center of the rotary tool 41).

  Similarly to the first reference example, in the fourth reference example, as shown in FIG. 15, the rotary tool 41 is separated from the reforming member 45 before the rotating tool 41 is inserted into the reforming member 45. Then, the surface of the modifying member 45 is irradiated with the laser beam L. Accordingly, the portion of the modifying member 45 irradiated with the laser beam L and its vicinity A10 are heated and heated to soften, so that the load when the rotary tool 41 is inserted into the modifying member 45 can be reduced.

After irradiating the laser beam L for a predetermined time before inserting the rotary tool 41 into the reforming member 45, the rotary tool 41 is inserted as shown in FIG. In the fourth reference example, even after the rotary tool 41 is inserted into the modifying member 45, the laser beam L can be irradiated continuously or intermittently, and the irradiation of the laser beam L can be stopped. After the rotary tool 41 is inserted into the reforming member 45, the rotary tool 41 is rotated while pressing the rotary tool 41 against the reforming member 45 with a predetermined pressure. In this process, the large diameter portion 43 in contact with the reforming member 45 is supplied to the surface of the reforming member 45 as a build-up material. That is, the large diameter portion 43 is consumed as the rotary tool 41 rotates. On the other hand, when the surface of the reforming member 45 is stirred by the small diameter portion 42, the material supplied as the build-up material from the large diameter portion 43 and the reforming member 45 are mixed or alloyed. The reforming part K can be used.

Even after the rotary tool 41 is inserted into the reforming member 45, if the laser beam L is irradiated, the rotary tool 41 can be inserted deeper into the reforming member 45. Therefore, the depth of the modified layer in the reforming member 45 can be increased.
In the fourth reference example described above, the mode in which the laser beam L is irradiated onto the modifying member 45 from the rotating shaft of the rotary tool 41 is disclosed. However, the surface modification is performed without the laser beam L being irradiated. (First form). Of course, it is needless to say that surface modification with irradiation of the laser beam L is a desirable form.
In the fourth reference example described above, the large-diameter portion 42 of the rotary tool 41 is consumed as the rotary tool 41 rotates. However, the non-consumable large-diameter portion 42 is allowed.

Further, in the above fourth reference example, the large-diameter portion 43 of the rotary tool 41 is consumed as the rotary tool 41 rotates, and the build-up material is supplied from the large-diameter portion 43. The portion 52 is made of the same material as that of the small diameter portion 53 and is of a non-consumable type, and the overlay material can also be supplied from the plate material 56 as shown in FIG. 17 (second embodiment). That is, the rotary tool 51 is inserted into the plate material 56 and the reforming member 55 and rotated with the plate material 56 serving as a build-up material placed on the surface of the reforming member 55. By doing so, the plate material 56 and the reforming member 55 are mixed or alloyed by stirring the surfaces of the plate material 56 and the reforming member 55, whereby the surface of the reforming member 55 can be used as the reforming portion K. .

Specific examples of the present invention will be described below.
<Experimental example 1>
An experiment according to the first reference example was performed. The experimental conditions were as follows, and the load (load during insertion) when the rotary tool was inserted into the joining member was measured. Moreover, the load at the time of moving after inserting a rotary tool in a joining member (load at the time of movement) was measured. The results are described below. It can be seen that the load during insertion and the load during movement are reduced by irradiating the laser beam. Thus, by reducing the load at the time of insertion and the load at the time of movement, the man-hour of the stir welding can be reduced, and the equipment rigidity can be reduced. Regarding the man-hour reduction, the speed during movement can be improved from 50 to 100 mm / min in the case of no laser beam irradiation to 100 to 150 mm / min.

Stir welding conditions Joining member material: Mild steel Joining member plate thickness: 5-10mm
Rotating tool rotation speed: 400rpm
Rotary tool moving speed: 50-100mm / min
Laser beam output: 1-2 kW
Laser beam irradiation diameter: 1 mm

Measurement result Insertion load: With laser beam irradiation ... 5 to 8 tons
No laser beam irradiation ... 9-12ton
Moving load: With laser beam irradiation ... 5 to 8 tons
No laser beam irradiation ... 6-9ton

<Experimental example 2>
An experiment according to the fourth reference example, the first embodiment was performed. However, the large diameter portion was a non-consumable type large diameter portion. The experimental conditions were as follows, and the moving speed (load during movement) after inserting the rotary tool into the reforming member was measured. Moreover, the average crystal grain size of the modified part was measured. The result will be described below. By moving the laser beam, the moving speed of the rotary tool can be improved. Further, the crystal grain size of the modified portion can be reduced by laser beam irradiation.

Stir welding conditions Joining member material: Mild steel Joining member plate thickness: 5-10mm
Rotating tool rotation speed: 400rpm
Laser beam output: 1-2 kW
Laser beam irradiation diameter: 1 mm

Measurement result Moving speed: With laser beam irradiation ... 100-150mm / min
No laser beam irradiation ... 50-100mm / min
Modified part average crystal grain size: with laser beam irradiation 5-10 μm
No laser beam irradiation ... 10-15 μm

1, 2, 31, 41, 51... Rotating tool, 2, 22, 32, 43 , 52... Large diameter portion, 3, 23, 33, 42 , 53... Small diameter portion, 5, 25, 35. , 55 ... reforming member, 6, 26, 36 ... butting part, 56 ... plate material, H1, H2, H3, H4, H5 ... through hole, K ... reforming part, L ... laser beam

Claims (1)

A small-diameter portion that processes the processing object by rotating in a state of being inserted into the processing object made of metal, and is integrated with the small-diameter portion, and presses the processing object while the small-diameter portion is being processed. A method of modifying the surface of the object to be processed with a rotary tool provided with a large diameter portion,
Before the rotary tool is opposed to the processing object and the small diameter portion is inserted into the processing object, the processing object is irradiated with a laser beam that has passed through a through hole formed in the rotating tool. Every
A metal surface modification method characterized in that a part of the pressed large-diameter portion is built up on the processing object by pressing the large-diameter part against the processing object.

Images