JP2022165559A - Work-piece processing method - Google Patents

Abstract

To provide a work-piece processing method that reduces temperature rise of a base material and can maintain preferable cooling rate with relatively simple and inexpensive method, can ensure a hardness of a manufactured metallic member surface as a result thereof, can increase shapes of a work-piece capable of corresponding, and can ensure high productivity.SOLUTION: A work-piece processing method, which manufactures a metallic member 1 comprising a plate-like base material 10 and a hardened layer 11 formed on one side of the base material 10, includes: a process in which a body part 13, which becomes the base material 10, is provided on a part in a thickness direction of a plate-like work-piece 12 thicker than the base material 10, and a temperature rise suppression part 14 is provided on the remainder; a process in which the work-piece is irradiated with laser beam to form the hardened layer 11 which is a laser processed part; and a process in which the temperature rise suppression part 14 is removed from the work-piece.SELECTED DRAWING: Figure 1

Description

The present invention relates to a work processing method for manufacturing a base material and a metal member having a laser-processed portion formed on the surface of the base material by subjecting the work to laser processing.

For example, laser lamination molding such as Laser Metal Deposition is well known as a laser processing method for the purpose of hardening a metal surface. Laser additive manufacturing is a technique for forming laminated parts by applying additional processing to metal workpieces by melting and solidifying metal powder and a base material using laser energy. If a metal powder different from that of the base material is used, a processing method that has never existed before, such as coating only the surface of the base material with a different metal, becomes possible.

However, since laser additive manufacturing heats and melts metal powder and the base material with a laser beam, the area irradiated with the laser beam locally reaches a high temperature near the melting point of the metal. becomes high temperature, it becomes impossible to maintain a preferable cooling rate, and the hardness of the laminated portion which is the laser-processed portion may be lowered. Similarly, in a processing method such as laser hardening to obtain hardness by forming a hardened portion, which is a laser-processed portion, by rapidly cooling a heated portion of the surface, lack of hardening hardness is a problem.

As a countermeasure against the decrease in the hardness of the laminated part and the insufficient quenching hardness of the quenched part, Patent Document 1 discloses that laser lamination molding is performed while supplying a cooling liquid to the inside of a hollow workpiece to reduce the temperature of the workpiece. A processing method for suppressing the rise and ensuring the hardness of the laminated portion is disclosed.

JP-A-11-336512

However, in the case of the method described in Patent Document 1, there are problems that a device for supplying the cooling liquid is required, and that the shape of the work is limited to the one that allows the cooling liquid to pass through the inside. Moreover, since the processing to the finished shape after processing is performed on a separate machine, the process becomes complicated.

An object of the present invention is to solve the above problems, and to reduce the temperature rise of the base material and maintain a preferable cooling rate by a relatively simple and inexpensive method, and as a result, the surface of the metal member manufactured To provide a work machining method capable of securing a hardness of 100 mm, adaptable to many workpiece shapes, and securing high productivity.

The present invention consists of the following aspects in order to achieve the above object.

1) A method of processing a work for manufacturing a metal member having a base material and a laser-processed portion formed on the surface of the base material by subjecting the work to laser processing,
A step of providing a temperature rise suppressing portion in the vicinity of the laser beam irradiation portion of the work, a step of irradiating the work with a laser beam to form a laser processed portion, and a step of removing the temperature rise suppressing portion from the work in which the laser processed portion is formed. A method of machining a workpiece, including a step of removing

2) The work processing method according to 1) above, wherein the work is provided with a main body serving as a base material of the metal member to be manufactured, and a temperature rise suppressing section added to the main body.

3) The metal member to be manufactured is composed of a plate-shaped base material and a laser-processed portion formed on one side of the base material, and the workpiece is a plate-like member thicker than the base material, and the thickness direction of the workpiece is 2) above, wherein the main body is provided on a part of the body, and the temperature rise suppressing part is provided on the remaining part.

4) the metal member to be manufactured is composed of a rod-shaped base material and a laser-processed portion formed on a part of the outer peripheral surface of the base material in the longitudinal direction, and the work is a rod-like shape longer than the base material; The work processing method according to 2) above, wherein the body portion is provided on a part of the work in the longitudinal direction, and the temperature rise suppressing portion is provided on the remaining portion of the work.

5) The method for processing a workpiece according to 1) above, wherein the workpiece is provided with a temperature rise suppressing portion composed of a heat sink having a heat radiation effect.

6) The method for processing a workpiece according to any one of 1) to 5) above, wherein the laser processing is laser additive manufacturing.

7) The method for processing a workpiece according to any one of 1) to 5) above, wherein the laser processing is laser hardening.

8) A method of working a workpiece according to any one of 1) to 7) above, wherein the three steps are performed by the same machine.

According to the work processing methods 1) to 8) described above, the overheating of the base material, the laminated portion, and the laser irradiation portion due to the heat input of laser processing is performed by a simpler and cheaper method than the method described in Patent Document 1. It becomes possible to reduce the temperature rise of the workpiece and maintain a preferable cooling rate. Therefore, it is possible to manufacture a metal member having desired surface characteristics and surface hardness and improved quality. Moreover, it is possible to manufacture various kinds of metal members, ensuring high productivity.

According to the work processing method of 8) above, a further improvement in productivity can be expected in the case of a work that can be processed by one chucking.

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows Embodiment 1 of the processing method of the workpiece|work by this invention in process order. FIG. 4 is a cross-sectional view showing the second embodiment of the work machining method according to the present invention in order of steps. 3A to 3C are cross-sectional views showing, in order of steps, Embodiment 3 of a method for machining a workpiece according to the present invention;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Embodiment 1
This embodiment is shown in FIG. 1, and is a work processing method for manufacturing a metal member in which a hardened layer made of a dissimilar metal is formed on one side of a plate-shaped base material.

When manufacturing a metal member 1 (see FIG. 1(d)) in which a hardened layer 11 made of a different metal is formed on one side in the thickness direction of a thin plate-shaped base material 10 by laser lamination molding, the metal member that is the final product When laser lamination molding is performed on the surface of a plate-shaped work having the same thickness as the base material 10 of 1, if the volume of the work is small and the amount of heat input by the laser is large, the work becomes hot and deforms, or the inside is deformed. Due to the high temperature, the structure of the workpiece may be altered or become annealed. Alternatively, the hardened layer to be formed may not be sufficiently cooled and the ideal hardness may not be obtained. In order to prevent this effect, the work 12 used to manufacture the metal member 1 is a plate-shaped work having a greater thickness and volume than the base material 10 of the metal member 1, which is the final product. In other words, a main body portion 13 that serves as the base material 10 of the metal member 1 is provided in a portion of the work 12 in the thickness direction, and a temperature rise suppressing portion 14 that is an excess thickness portion is provided in the remaining portion in the thickness direction, It suppresses the temperature rise of the workpiece 12 due to the heat input during laser lamination manufacturing, which will be described later (see FIG. 1(a)). The upper surface of the body portion 13 (the surface of the body portion 13 opposite to the side on which the temperature rise suppression portion 14 is provided) is the laser beam irradiation portion, and the temperature rise suppression portion 14 is provided in the vicinity of the laser beam irradiation portion. there is

Then, the laser beam irradiation part is irradiated with a laser beam, and while suppressing the temperature rise of the work 12 due to heat input by the function of the temperature rise suppressing part 14, the upper surface of the main body part 13 of the work 12 is subjected to laser lamination molding. A hardened layer 11, which is a processed portion, is formed (see FIG. 1(b)).

Thereafter, the temperature rise suppressing portion 14 of the workpiece 12 is removed (see FIG. 1(c)), and the entire surface including the surface of the hardened layer 11 is finished (see FIG. 1(d)).

Thus, the metal member 1 is manufactured.
Embodiment 2
This embodiment is shown in FIG. 2, and is a work processing method for manufacturing a metal member in which a hardened layer made of a dissimilar metal is formed on the surface of a round bar-shaped base material.

A metal member 2 (Fig. 2(d) )), laser beams are applied to the outer peripheral surface of half of the one longitudinal end side and the end face of the one longitudinal end side of a round bar-shaped work having the same diameter and the same length as the base material 20 of the metal member 2 as the final product. When additive manufacturing is applied, heat is continuously input to the workpiece from the outer periphery, and the direction of heat diffusion is limited, so the workpiece is easily heated, and the workpiece becomes hot and softens during processing. , there is a possibility that the surface hardness of the hardened layers 21 and 22 cannot be increased. In order to prevent this effect, as the work 23, a work 23 having the same diameter as the base material 20 and being long and having a large volume is used. In other words, a main body portion 24, which serves as the base material 20 of the metal member 2, is provided on a part of the work 23 in the longitudinal direction, and a temperature rise suppressing portion 25, which is an excess wall portion, is provided on the remaining portion in the longitudinal direction. It suppresses the temperature rise of the work 23 due to the heat input during laser lamination manufacturing, which will be described later (see FIG. 2(a)). A fixed length portion of the outer peripheral surface of the body portion 24 on the side of the temperature rise suppressing portion 25 is a laser beam irradiation portion, and the temperature rise suppressing portion 25 is provided in the vicinity of the laser beam irradiation portion.

Then, the laser beam irradiation part is irradiated with a laser beam, and the heat is released to the temperature rise suppressing part 25, thereby suppressing the temperature rise of the work 23 due to the heat input, and the temperature rise suppressing part 25 side of the main body part 24 of the work 23. laser lamination molding is applied to the outer peripheral surface of a fixed length portion of the , to form a hardened layer 21 which is a laser-processed portion (see FIG. 2(b)).

Next, the temperature rise suppressing portion 25 of the workpiece 23 is removed (see FIG. 2(c)).

After that, laser lamination molding is performed by irradiating the end surface exposed by removing the temperature rise suppressing part 25 with a laser beam to form the hardened layer 22 which is the laser processed part, and further including the surfaces of the hardened layers 21 and 22 Finishing is applied to the whole (see Fig. 2(d)).

Thus, the metal member 2 is manufactured.

In the first and second embodiments described above, the laser additive manufacturing has been described, but the present invention can also be applied to plate-like workpieces and round bar-like workpieces in laser hardening and other laser processing that applies heat such as welding.
Embodiment 3
This embodiment is shown in FIG. 3, and is a work processing method for manufacturing a metal member in which a hardened portion is formed on the outer peripheral surface of a pipe-shaped base material.

When manufacturing the metal member 3 (see FIG. 3(d)) in which the hardened portion 31 is formed on the outer peripheral surface of the pipe-shaped base material 30 by the laser hardening method, the outer diameter and the same diameter as the base material 30 of the metal member 3 are manufactured. When laser hardening is applied to the outer peripheral surface of a thick pipe-shaped work, the work becomes hot and the self-cooling effect of the laser beam irradiation part weakens, and it is possible that the surface hardness of the obtained hardened part 31 cannot be increased. have a nature. In order to prevent this effect, the work 32 having the same outer diameter as the base material 30 and having a peripheral wall thicker than the base material 30 and having a larger volume is used. In other words, the main body portion 33, which serves as the base material 30 of the metal member 3, is provided on the outer portion in the thickness direction of the peripheral wall of the work 32, and the temperature rise suppressing portion 34, which is an excess wall portion, is provided on the inner portion in the thickness direction. In this way, the temperature rise of the workpiece 32 due to the heat input during the laser hardening process, which will be described later, is suppressed (see FIG. 3(a)). The outer peripheral surface of the body portion 33 is a laser beam irradiation portion, and the temperature rise suppressing portion 34 is provided near the laser beam irradiation portion.

Then, the laser beam irradiation part is irradiated with a laser beam, and the heat is released to the temperature rise suppressing part 34 to suppress the temperature rise of the work 32 due to the heat input, and the outer peripheral surface of the main body part 33 of the work 32 is laser hardened. to form a hardened portion 31 which is a laser-processed portion (see FIG. 3(b)).

Next, the temperature rise suppressing portion 34 of the work 32 is removed (see FIG. 3(c)), and the entire work is finished (see FIG. 3(d)).

Thus, the metal member 3 is manufactured.

Although the laser hardening process has been described in the above-described third embodiment, the present invention can also be applied to laser lamination molding and other laser processes in which heat is applied to a pipe-shaped work such as welding.

In the above-described three embodiments, the temperature rise suppressing portion provided in the work is a portion having a larger volume than the main body serving as the base material of the metal member. A heat sink having a heat dissipation property may be provided on the substrate. Heat sinks having heat dissipation properties include pin-shaped fins, thin plate-shaped fins, and corrugated fins, as is well known.

INDUSTRIAL APPLICABILITY The work processing method according to the present invention is suitably used for manufacturing a metal member having a base material, a hardened layer formed on the surface of the base material, and a laser-processed portion such as a quenched portion.

1: Metal member, 10: Base material, 11: Hardened layer, 12: Work, 13: Body part, 14: Temperature rise suppression part, 2: Metal member, 20: Base material, 21, 22: Hardened layer, 23: Work 24: Main body 25: Temperature rise suppressing part 3: Metal member 30: Base material 31: Hardened layer 32: Work 33: Main body 34: Temperature rise suppressing part

Claims (8)

A workpiece processing method for manufacturing a metal member having a base material and a laser-processed portion formed on the surface of the base material by subjecting the workpiece to laser processing,
A step of providing a temperature rise suppressing portion in the vicinity of the laser beam irradiation portion of the work, a step of irradiating the work with a laser beam to form a laser processed portion, and a step of removing the temperature rise suppressing portion from the work in which the laser processed portion is formed. A method of machining a workpiece, including a step of removing 2. The method of processing a workpiece according to claim 1, wherein the workpiece is provided with a main body serving as a base material of the metal member to be manufactured, and a temperature rise suppressing section added to the main body. A metal member to be manufactured is composed of a plate-shaped base material and a laser-processed portion formed on one side of the base material, and the work is a plate-shaped work having a thickness thicker than that of the base material. 3. A method of working a workpiece according to claim 2, wherein said body portion is provided in one portion, and said temperature rise suppressing portion is provided in said remaining portion. A metal member to be manufactured is composed of a rod-shaped base material and a laser-processed portion formed on a part of the outer peripheral surface of the base material in the longitudinal direction, and the work is a rod-shaped longer than the base material, and the work 3. The method of processing a workpiece according to claim 2, wherein the body portion is provided in a part of the longitudinal direction of (2), and the temperature rise suppressing portion is provided in the remaining portion of the same. 2. The method of processing a workpiece according to claim 1, wherein the workpiece is provided with a temperature rise suppressing portion comprising a heat sink having a heat radiation effect. 6. The method for processing a workpiece according to claim 1, wherein the laser processing is laser additive manufacturing. 6. The work processing method according to claim 1, wherein the laser processing is laser hardening. The step of providing a temperature rise suppressing portion in the vicinity of the laser beam irradiation portion of the work and the step of removing the temperature rise suppressing portion from the work on which the laser processing portion is formed are performed by the same machine. A method for processing a workpiece according to any one of claims 1 to 7.

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