KR102209877B1 - Additive Manufacturing Apparatus of Unweldable Materials and The Method Thereof - Google Patents

Abstract

In the process of laminating a poorly weldable material, the present invention laminates and molds a poorly weldable material at high speed by performing a focus offset of an energy beam irradiated to perform lamination and a preheating process of a previously stacked layer in parallel. It is an object of the present invention to provide a method of laminating a hardly weldable material and an apparatus therefor.
One embodiment of the present invention for achieving the object of the present invention described above, a poorly weldable material supply unit for supplying a poorly weldable material; An energy beam generator generating an energy beam irradiated with the poorly weldable material; A focus offset control unit for adjusting a focus offset of the energy beam irradiated by the energy beam generator; A preheating unit for preheating the previously generated layer of hardly weldable material; And controlling the preheating of the previously generated layer of the non-weldable material of the preheating unit, the supply of the poorly welded material of the poorly welded material supply unit, and irradiation of the energy beam with power and focus offset adjusted to the energy beam generator and the focus offset control unit. Thus, it provides a non-weldable material laminating apparatus comprising a; a control unit for laminating a new hardly weldable material layer on top of the previously generated hardly weldable material layer.

Description

BACKGROUND OF THE INVENTION [0002] TECHNICAL FIELD The apparatus for laminating materials with poor welding properties and the method thereof

The present invention relates to a high-speed lamination technology of a poorly weldable material, and more particularly, in the process of laminating a poorly weldable material, a focus offset of an energy beam irradiated to perform lamination and a previously stacked layer The present invention relates to an apparatus for laminating a poorly weldable material and a method for laminating a poorly weldable material at high speed by performing a preheating process in parallel.

1 is a graph showing the melting point temperature distribution and the degree of poorly weldability of the super heat-resistant poorly welded material of the prior art, and FIG. 2 is a lamination surface in which the surface quality is degraded due to the bowling phenomenon during the melt lamination of the poorly weldable materials of FIG. It's a picture.

The conventional super heat-resistant, poorly welded materials such as IN100, MarM76, Rene80, U700 pmA, and U700pmB of FIG. 1 exhibit a bowling phenomenon during melt lamination using a 3D printer due to low weldability and high surface tension by having a high melting point. As a result, the surface quality is degraded, and when the stacking speed is accelerated, the bowling phenomenon is also accelerated and the surface quality is further deteriorated. When the stacking is performed at a low speed to secure the surface quality, the product continuity decreases.

Accordingly, for 3D printing of a hardly weldable material having a high melting point, Korean Patent No. 1780465 discloses a three-dimensional shaping method of a metal material using 3D printing capable of microstructure control, and Korean Patent Publication No. 2004-0103920 Discloses a high melting point metal and alloy refining technology by laser formation and melting for the manufacture and regeneration of high fusion metal parts, but in the case of the above-described conventional techniques, 3D printing lamination molding for the super heat-resistant poorly weldable material of FIG. 1 It has not been able to solve the problem of reducing product manufacturing continuity due to the bowling phenomenon that occurs and the low speed of the process.

Korean Patent Registration No. 1780465 Republic of Korea Patent Publication No. 2004-0103920

Therefore, an embodiment of the present invention for solving the problems of the prior art described above is, in the process of laminating a poorly weldable material using 3D printing technology, the energy beam irradiated for preheating and lamination molding of the previously laminated layer. By performing the control of the focus offset in parallel, the occurrence of bowling is minimized during lamination of poorly weldable materials, thereby improving the surface quality of the product, while enabling the lamination and molding of poorly weldable materials at high speed. It is an object of the present invention to provide a material laminating apparatus and method thereof.

One embodiment of the present invention for achieving the object of the present invention described above, a poorly weldable material supply unit for supplying a poorly weldable material; An energy beam generator generating an energy beam irradiated with the poorly weldable material; A focus offset control unit for adjusting a focus offset of the energy beam irradiated by the energy beam generator; A preheating unit for preheating the previously generated layer of hardly weldable material; And controlling the preheating of the previously generated layer of the non-weldable material of the preheating unit, the supply of the poorly welded material of the poorly welded material supply unit, and irradiation of the energy beam with power and focus offset adjusted to the energy beam generator and the focus offset control unit. Thus, it provides a non-weldable material laminating apparatus comprising a; a control unit for laminating a new hardly weldable material layer on top of the previously generated hardly weldable material layer.

The control unit according to an embodiment of the present invention includes preheating of the preheated layer of the non-weldable material of the preheating unit, supplying the poorly weldable material of the poorly weldable material supply unit, and power and focus of the energy beam generation unit and the focus offset control unit. By controlling the irradiation of the offset-adjusted energy beam, stacking a new layer of poorly weldable material on top of the previously generated layer of poorly welded material is repeatedly performed until the layer of poorly welded material is stacked with a preset layer. Can be configured.

The energy beam generator may be configured to irradiate an energy beam of 50 W to 1,000 W.

The energy beam generator may be configured to scan and irradiate the energy beam at a scan speed ranging from 4,500 mm/s to 8,000 mm/s.

The preheater may be configured to preheat the hardly weldable material layer to a temperature of 70% to 90% of the melting temperature of the hardly weldable material.

The focus offset control unit may be configured to adjust a focus offset of an electron beam for forming the hardly weldable material layer in a range of 1 to 10 mA.

Another embodiment of the present invention for achieving the above-described technical problem is a preheating step of preheating the previously generated layer of a non-weldable material to a preset temperature; And an energy beam whose power and focus offset are adjusted so that heat energy is transmitted to the previously generated poorly weldable material layer after supplying a poorly weldable material to the preheated previously generated poorly weldable material layer to the supplied poorly weldable material. It provides a method of laminating a poorly weldable material comprising a; lamination step of laminating a new layer of a poorly weldable material by irradiation.

The method of laminating the poorly weldable material may further include repeating the preheating step and the laminating step until a predetermined number of layers of the poorly weldable material layer is formed after performing the lamination step. .

The laminating step may be a step of irradiating by adjusting the power of the energy beam in a range of 50 W to 1,000 W.

The laminating step may be a step of irradiating by adjusting the scan speed of the energy beam in a range of 4,500 mm/s to 8,000 mm/s.

The preheating step may be a step of preheating the hardly weldable material rares of the upper layer including the uppermost hardly weldable material layer to a temperature of 70% to 90% of the melting temperature of the hardly weldable material.

The stacking step may be performed by adjusting the focus offset in the range of 1 to 10 mA.

According to embodiments of the present invention, in the process of laminating a poorly weldable material using 3D printing technology, heat generated by the energy beam irradiated for preheating and lamination of the previously laminated layer is generated. By simultaneously adjusting the power of the energy beam and the focus offset so that it is transmitted to the weldable layer, the occurrence of bowling during lamination of poorly weldable materials is minimized to improve the surface quality of the product while improving the surface quality of poorly weldable materials at high speed. It provides an effect that enables lamination molding.

1 is a graph showing the melting point temperature distribution and the degree of poorly weldability of a conventional super heat-resistant poorly weldable material.
FIG. 2 is a photograph showing a laminated surface in which surface quality is deteriorated due to a bowling phenomenon during melt lamination of the poorly welded materials of FIG. 1 using 3D printing.
3 is a schematic configuration diagram of a hard-to-weld material laminating apparatus 100 in which an energy beam generator according to an embodiment of the present invention includes a laser generator 130.
4 is a schematic configuration diagram of a hard-to-weld material laminating apparatus 200 in which an energy beam generator according to an embodiment of the present invention is configured with an electron beam generator 230.
5 is a view showing a shape of a melting pool formed in a poorly weldable material according to a focus offset adjustment of an electron beam generated by an electron beam generating unit 230 of the poorly weldable material laminating apparatus 200;
FIG. 6 is a view showing a region in which heat of the melting portion according to the shape of the melting portion formed in the non-weldable material according to the focus offset control of FIG. 5 is transferred to the layer of the non-weldable material in which the heat of the melting portion is stacked.
7 is a diagram showing a penetration range of thermal energy for each focus offset of an energy beam.
8 is a view comparing the heat transfer range by the melting portion formed by the energy beam when the previously generated poorly weldable layer is not preheated (a) and when preheated (b).
9 is a view showing a processing process of a method of laminating a poorly weldable material according to another embodiment of the present invention.
10 is a graph showing the surface quality of a poorly weldable sculpture formed by laminating a poorly weldable material according to a focus offset range of an energy beam irradiated during lamination of a poorly weldable material.
11 is a graph showing the surface quality of a poorly weldable sculpture formed by laminating a poorly weldable material according to a scan speed of an energy beam irradiated during lamination of a poorly weldable material.
12 is a graph showing the surface quality of a poorly weldable sculpture formed by laminating a poorly weldable material according to the power of an energy beam irradiated when laminating a poorly weldable material.
13 is a graph showing the surface quality of a poorly weldable sculpture formed by laminating a poorly weldable material according to a preheating temperature when laminating a poorly weldable material.

Hereinafter, the present invention will be described with reference to the accompanying drawings. However, the present invention may be implemented in various different forms, and therefore is not limited to the embodiments described herein. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and similar reference numerals are assigned to similar parts throughout the specification.

Throughout the specification, when a part is said to be "connected (connected, contacted, bonded)" with another part, it is not only "directly connected", but also "indirectly connected" with another member in the middle. "Including the case. In addition, when a part "includes" a certain component, it means that other components may be further provided, rather than excluding other components unless specifically stated to the contrary.

The terms used in the present specification are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, terms such as "comprise" or "have" are intended to designate the presence of features, numbers, steps, actions, components, parts, or a combination thereof described in the specification, but one or more other features. It is to be understood that the presence or addition of elements or numbers, steps, actions, components, parts, or combinations thereof, does not preclude in advance.

An embodiment of the present invention, a poorly weldable material supply unit for supplying a poorly weldable material; An energy beam generator generating an energy beam irradiated with the poorly weldable material; A focus offset control unit for adjusting a focus offset of the energy beam irradiated by the energy beam generator; A preheating unit for preheating the previously generated layer of hardly weldable material; And controlling the preheating of the previously generated layer of the non-weldable material of the preheating unit, the supply of the poorly welded material of the poorly welded material supply unit, and irradiation of the energy beam with power and focus offset adjusted to the energy beam generator and the focus offset control unit. Thus, it provides a non-weldable material laminating apparatus comprising a; a control unit for laminating a new hardly weldable material layer on top of the previously generated hardly weldable material layer.

The control unit may include preheating of the previously generated layer of poorly weldable material of the preheating unit, supply of a poorly weldable material of the poorly weldable material supply unit, and power and focus offset of the energy beam generator and the focus offset control unit. It may be configured to repeatedly perform the stacking of a new poorly weldable material layer on top of the previously generated poorly weldable material layer by controlling the irradiation of the layer until the poorly weldable material layer is laminated and formed as a preset layer.

The energy beam generator may be configured to irradiate an energy beam of 50 W to 1,000 W.

The energy beam generator may be configured to scan and irradiate the energy beam at a scan speed ranging from 4,500 mm/s to 8,000 mm/s.

The preheater may be configured to preheat the hardly weldable material layer to a temperature of 70% to 90% of the melting temperature of the hardly weldable material.

The focus offset control unit may be configured to adjust a focus offset of an electron beam for forming the hardly weldable material layer in a range of 1 to 10 mA.

Another embodiment of the present invention for achieving the above-described technical problem is a preheating step of preheating the previously generated layer of a non-weldable material to a preset temperature; And supplying a poorly weldable material to the preheated previously generated poorly weldable material layer, and transferring thermal energy generated by an energy beam for forming a poorly weldable material layer to the previously generated poorly weldable material layer. It provides a method of laminating a poorly weldable material comprising a; laminating step of laminating a new layer of a poorly weldable material by irradiating with the supplied poorly weldable material after adjusting power and focus offset.

The method of laminating the poorly weldable material may further include repeating the preheating step and the laminating step until a predetermined number of layers of the poorly weldable material layer is formed after performing the lamination step. .

The laminating step may be a step of irradiating by adjusting the power of the energy beam in a range of 50 W to 1,000 W.

In the laminating step, the energy beam may be irradiated at a scan speed ranging from 4,500 mm/s to 8,000 mm/s.

The preheating step may be a step of preheating the hardly weldable material rares of the upper layer including the uppermost hardly weldable material layer to a temperature of 70% to 90% of the melting temperature of the hardly weldable material.

The stacking step may be performed by adjusting the focus offset in the range of 1 to 10 mA.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is a schematic configuration diagram of a non-weldable material laminating apparatus 100 comprising a laser generator 130 for irradiating a laser L as an energy beam in an energy beam generator according to an embodiment of the present invention.

As shown in FIG. 3, the non-weldable material laminating device 100 provided with the laser generating unit 130 includes a poorly-welded material supply unit 110, a housing 120, a laser generating unit 130, and an irradiated laser (L A first focus offset control unit 140 for adjusting the focus offset of ), a preheating unit 145, and a molding space 150 for forming a non-welded material sculpture are formed in the center, and the housing 120 and laser are generated at the top. It is configured to include a table T and a control unit 10 on which the unit 130 and the first focus offset control unit 140 are mounted.

The poorly weldable material supply unit 110 includes a storage unit 111 for storing a poorly weldable material outside the housing 120, and a nozzle 113 is extended into the housing 120 to form a substrate 160 It is configured to supply the poorly weldable material to the top of the poorly weldable layer for forming the previously formed poorly weldable material sculpture (S) on the upper part of ). At this time, the nozzle 113 has a tubular shape, a rectangular shape, etc., and has a door opened and closed to control the supply of the non-weldable material to an end portion from which the poorly-welded material is discharged. In addition, the substrate 160 is configured to elevate and descend within the molding space 150.

The housing 120 includes a laser generator 130, a first focus offset control unit 140, and an enclosure that isolates the table T from the outside. In this case, the housing 120 may be formed of a transparent material for observation of a non-weldable material sculpture to be laminated.

The laser generator 130 is mounted on the inner upper surface of the housing 120 and is configured to irradiate a laser for melting the hardly weldable material supplied through the hardly weldable material supply unit 110. The laser generator 130 may be configured to scan and irradiate a laser at a scan speed ranging from 4,500 mm/s to 8,000 mm/s, having a power in the range of 50 W to 1,000 W.

The first focus offset control unit 140 is configured to include an array of a plurality of lenses 141 to be positioned, and is configured to adjust a focus offset by adjusting a focal size and a focal length of the laser L. . The first focus offset control unit 140 may be configured to adjust the focus offset of the laser L in a range of 1 to 10 mA.

The preheating unit 145 is configured to preheat the generated poorly weldable layer PL to a predetermined temperature. In the case of FIGS. 3 and 4, the preheating unit 145 is shown to be embedded in the table T, but the present invention is not limited thereto, and the non-weldable material layer PL is laminated in the housing 120. It may be configured to apply heat to the previously generated hardly weldable material layer PL, which is composed of a heater or a torch that is positioned. The preheating unit 145 may be configured to preheat the previously generated layer of poorly welded material PL to a temperature of 70% to 90% of the melting temperature of the poorly welded material.

The control unit 10 will be described after a description of the configuration of the hardly weldable material laminating apparatus 200 including the electron beam generating unit 230 as the energy beam generating unit of FIG. 4.

4 is a schematic configuration diagram of a non-weldable material laminating apparatus 200 including an electron beam generator 230 for irradiating an electron beam as an energy beam in the energy beam generator according to an embodiment of the present invention.

As shown in FIG. 4, the non-weldable material laminating device 200 having the electron beam generating unit 230 includes a poorly-welded material supply unit 110, a housing 120, an electron beam generating unit 230, and irradiated electrons. A second focus offset control unit 240 for adjusting the focus offset of the beam E, a preheating unit 145, and a molding space 150 for forming a hard-to-weld material sculpture are formed in the center, and the housing 120 is at the top. , An electron beam generator 230, a second focus offset control unit 240, a table T on which the preheating unit 145 is mounted, and a control unit 145.

In the configuration of the hardly weldable material laminating device 200 of FIG. 4, the hardly weldable material supply unit 110, the housing 120, the substrate 160, the preheating unit 145, and the table T are supplied with the hardly weldable material of FIG. Since the configuration and operation of the non-weldable material supply unit, the housing, the substrate, and the table configured in the apparatus 100 are the same, the same reference numerals as in FIG. 3 are used, and a detailed description thereof is omitted.

The electron beam generator 230 is mounted on the inner upper surface of the housing 120 and is configured to irradiate an electron beam E for melting the hardly weldable material supplied through the hardly weldable material supply unit 110 . Specifically, the electron beam generator 230 is spaced a predetermined distance from the electrode 231 to which the high voltage cable introduced from the outside of the housing 120 is connected, and the cathode 233 and cathode 233 generating negative potential. It is configured to include an anode 235 that generates a positive electric potential, and accelerates electrons by a potential difference between the cathode 233 and the anode 235 to generate an electron beam with a poorly weldable material supplied on the substrate 160. It is configured to scan and investigate. The electron beam generator 230 having the above-described configuration has a power in the range of 50 W to 1,000 W, and is configured to scan and irradiate the electron beam E at a scan speed in the range of 4,500 mm/s to 8,000 mm/s. Can be.

The second focus offset control unit 240 is a focus foil 241 formed in a cylindrical shape so that the electron beam 141 is irradiated at the center in order to converge the electron beam 141 to the supplied poorly weldable material. It includes a deflection coil 243 and is configured to move up and down in the interior of the housing 120. The second focus offset control unit 240 of the above-described configuration adjusts the strength of the magnetic field by adjusting the magnitude of the current supplied to the deflection coil 243, and adjusts the focus offset of the electron beam E by moving up and down. Is done. The second focus offset control unit 240 may be configured to adjust the focus offset of the electron beam E in a range of 1 to 10 mA.

3 and 4, the control unit 10 controls the preheating unit 145 to preheat the previously generated poorly weldable material layer PL to stack the poorly weldable material layer, and the poorly weldable material The supply unit 110 is controlled to supply a poorly weldable material to the upper portion of the preheated previously generated poorly weldable material layer PL. Hereinafter, the layer formed by the supplied poorly weldable material is referred to as a “hardly weldable material layer (NL)”. After that, the energy beam irradiated from the energy beam generator is controlled by controlling the energy beam generator (laser generator 130 or electron beam generator 230) and the first or second focus offset controller 140.240. Driving of the laser hardly weldable material laminating apparatus 100, 200 for lamination of a hardly weldable material comprising controlling power and focus offset of (laser or electron beam) to irradiate the hardly weldable material layer NL Is configured to control.

5 is a view showing the shape of a molten portion M formed in a poorly weldable material according to a focus offset control of an electron beam generated by the electron beam generating unit 230 of the poorly weldable material stacking apparatus 200, FIG. 6 Is a view showing a region in which heat of the molten portion according to the shape of the melting portion formed in the non-weldable material according to the focus offset control of FIG. 5 is transferred to the layer of the non-weldable material, and FIG. 7 is It is a figure showing the range.

In FIG. 5, (a) shows that the focus offset of the electron beam E is adjusted so that the second focus offset control unit 240 moves upward and the current is adjusted so that the melting part M is formed to have a long length and a narrow width. (B) shows that the focus offset of the electron beam E is adjusted so that the second focus offset control unit 240 moves downward so that the melting portion M is formed with a short length and a wide width. Although not shown in the drawing, in the case of the apparatus 100 for laminating the hardly weldable material of FIG. 2, by adjusting the positions of the lenses 141 constituting the first focus offset control unit 140, the melting unit M ) To adjust the length (depth) and width (width).

That is, when the length of the melting part M is long and the horizontal width is narrow as shown in FIG. 6A, heat is deeply transmitted from the narrow region to the poorly welded layer stacked below. In contrast, as shown in FIG. 6 (b), when the length of the melting portion M is short and the horizontal width is wide, heat transfer of the melting portion M is made wide in the horizontal direction, but is not transmitted in the depth direction. do. In other words, as shown in FIG. 7, by adjusting the vertical length (depth) and horizontal width (width) of the melting part (M) by different focus offsets, melting in the non-welded material to be stacked and the stacked layers By adjusting the heat transfer range of the part (M) differently, it is possible to easily perform lamination of a poorly weldable material while maintaining high quality surface quality.

FIG. 8 is a diagram illustrating a comparison of a heat transfer range by an energy beam in a case where a previously generated poorly weldable layer PL is not preheated (a) and is preheated (b).

When the hardly weldable material is melted and laminated by irradiating an energy beam having the same focus offset, when the previously generated hardly weldable material layer PL is not preheated, as shown in Fig. 8A, the melting part M The range in which the heat is transferred becomes narrow, and the quality of the laminated sculpture is deteriorated. In addition, when the previously generated hardly weldable material layer PL is preheated, as shown in FIG. 8B, the range in which the heat of the molten part M is transmitted becomes deep and wide, thereby improving the quality of the laminated sculpture.

9 is a view showing a processing process of a method of laminating a poorly weldable material according to another embodiment of the present invention.

As shown in FIG. 9, the method of laminating a poorly weldable material according to another embodiment of the present invention includes the first layer forming a poorly welded material layer (S10), a preheating step (S20), a laminating step (S30), and the preheating step (S20) and the laminating step ( It is configured to include the step of repeatedly performing S30).

In the first hardly weldable material layer forming step (S10), after forming the hardly weldable material layer NL by supplying the hardly weldable material to the substrate 160, the laser is controlled by adjusting the power of the energy beam, the focus offset, and the scan speed. Alternatively, the first hardly weldable material layer PL1 is formed by irradiating an energy beam such as an electron beam to the hardly weldable material layer NL.

Next, the poorly weldable material layer PL1, previously generated in the preheating step (S20), is preheated to a temperature of 70% to 90% of the melting temperature of the poorly weldable material.

Thereafter, in the lamination step (S30), the hardly weldable material is supplied to the preheated hardly weldable material ray PL1 to form a hardly weldable material layer NL, and then the power of an energy beam such as a laser or an electron beam , A new poorly weldable material layer PL2 is formed on the previously generated poorly weldable material layer PL1 by irradiating an energy beam to the poorly weldable material layer NL while adjusting focus offset and scanning speed. .

Next, in the step of repeatedly performing the preheating step (S20) and the laminating step (S30), the preheating step (S20) and the stacking step (S30) are performed by returning to the preheating step (S30). Repeatedly performed until the layers of are formed in a preset number.

The step of repeatedly performing the preheating step (S20) and the stacking step (S30) is performed by determining whether the lamination is terminated because the layer of the hardly weldable material layer is formed in a preset number (S40), and the lamination is terminated. In this case, the lamination is terminated to produce a sculpture formed by lamination of a poorly weldable material.

<Experimental Example>

The focus offset, the scan speed and the preheating temperature were varied, and the poorly welded material Rene 80 was prepared by using the poorly welded material laminating apparatus 100 and 200 of the embodiment of the present invention, and the surface quality of each was measured.

10 is a graph showing the surface quality of a poorly weldable sculpture formed by laminating a poorly weldable material according to a focus offset range of an energy beam irradiated when laminating a poorly weldable material.

Specifically, FIG. 10 is a graph showing a graph of measuring surface roughness after laminating and forming a hard-to-weld material Rene 80 while adjusting the focus offset of an energy beam having an energy beam irradiation scan speed of 4,500 mm/s and an energy beam power of 300 W. As shown in FIG. 10, when the focus offset of the energy beam is in the range of 1 to 10 mA, the quality condition requiring surface roughness is satisfied.

11 is a graph showing the surface quality of a poorly weldable sculpture formed by laminating a poorly weldable material according to a scan speed of an energy beam irradiated when laminating a poorly weldable material.

Specifically, FIG. 11 is a graph showing a graph of measuring the surface roughness after laminating and forming a hard-to-weld material Rene 80 by varying the scan speed of an energy beam having a 300 W and a focus offset of 8 mA. As shown in FIG. 11, the quality condition required for surface roughness was satisfied in a range of 8,500 mm/s or less of the energy beam irradiation scan speed. However, in the case of lamination-molding a poorly welded material by scanning and irradiation at a scan speed in the range of 4,500 mm/s to 8,000 mm/s, it was possible to obtain high-quality surface quality without reducing product continuity.

12 is a graph showing the surface quality of a poorly weldable sculpture formed by laminating a poorly weldable material according to the power of an energy beam irradiated when laminating a poorly weldable material.

Specifically, FIG. 12 is a graph showing the measurement of the surface roughness after laminating and forming a hardly weldable material Rene 80 while varying the power of the energy beam having an energy beam irradiation scan speed of 4,500 mm/s and a focus offset of 8 mA. As shown in FIG. 12, when the power of the energy beam is in the range of 50 W to 1,000 W, lamination molding could be performed at a lamination speed that guarantees product manufacturing continuity, and the surface roughness of the lamination molded sculpture satisfies the required quality condition. I could see that I was satisfied.

13 is a graph showing the surface quality of a poorly weldable sculpture formed by laminating a poorly weldable material according to a preheating temperature when laminating a poorly weldable material.

Specifically, it is shown in a graph by measuring the surface roughness after laminating-molding the hardly weldable material Rene 80 by varying the preheating temperature using an energy beam having 300 W and a focus offset of 8 mA. As shown in Fig. 13, when performing lamination molding by preheating the previously generated layer of poorly welded material (PL) to 70% to 90% of the melting temperature of the poorly welded material, high-quality surface quality without deteriorating product manufacturing continuity Was able to get.

The above description of the present invention is for illustrative purposes only, and those of ordinary skill in the art to which the present invention pertains will be able to understand that it can be easily modified into other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not limiting. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as being distributed may also be implemented in a combined form.

The scope of the present invention is indicated by the claims to be described later, and all changes or modified forms derived from the meaning and scope of the claims and the concept of equivalents thereof should be construed as being included in the scope of the present invention.

100: first poorly weldable material laminating device
200: second poorly weldable material laminating device
110: poorly weldable material supply
120: housing
130: laser beam generator
140: first focus offset control unit
141: lens
145: preheating unit
150: molding space
160: substrate
230: electron beam generator
240: second focus offset control unit
231: electrode
233: cathode
235: anode
L: laser beam
E: electron beam
T: table
S: Sculpture of poorly weldable material

Claims (12)

A poorly weldable material supply unit for supplying a poorly weldable material;
An energy beam generator generating an energy beam irradiated with the poorly weldable material;
A focus offset control unit for adjusting a focus offset of the energy beam irradiated by the energy beam generator;
A preheating unit for preheating the previously generated layer of hardly weldable material; And
The energy beam generator and the focus offset control unit so that the preheating of the previously generated layer of the non-weldable material of the preheating unit, the supply of the non-weldable material of the poorly welded material supply unit, and the heat energy are transmitted to the previously generated layer of the poorly weldable material. Including; a control unit for controlling the irradiation of the energy beam with adjusted power and focus offset to stack a new layer of poorly welded material on the previously generated layer of poorly welded material,
The focus offset control unit,
Hardly weldable material laminating apparatus, characterized in that configured to adjust the focus offset of the electron beam for forming the hardly weldable material layer in the range of 1 ~ 10mA. The method of claim 1, wherein the control unit,
Controls the preheating of the previously generated layer of the non-weldable material of the preheating unit, the supply of the non-weldable material of the poorly welded material supply unit, and the irradiation of the energy beam adjusted with power and focus offset of the energy beam generator and the focus offset control unit And laminating a new hardly weldable material layer on top of the previously generated hardly weldable material layer, wherein the hardly weldable material layer is repeatedly performed until the hardly weldable material layer is laminated with a preset layer. Device. The method of claim 1, wherein the energy beam generator,
Hardly weldable material laminating apparatus, characterized in that configured to irradiate an energy beam of 50 W to 1,000 W. The method of claim 1, wherein the energy beam generator,
Hardly weldable material laminating apparatus, characterized in that configured to scan and irradiate the energy beam at a scan speed ranging from 4,500 mm/s to 8,000 mm/s. The method of claim 1, wherein the preheating unit,
Hardly weldable material laminating apparatus, characterized in that configured to preheat the hardly weldable material layer to a temperature of 70% to 90% of the melting temperature of the hardly weldable material. delete A preheating step of preheating the previously generated layer of hardly weldable material to a preset temperature; And
After supplying a poorly weldable material to the preheated previously generated poorly weldable material layer, an energy beam whose power and focus offset are adjusted so that heat energy is transmitted to the previously generated poorly weldable material layer is irradiated with the supplied poorly weldable material Including; a lamination step of laminating a new hardly weldable material layer by,
The lamination step,
A method of laminating a poorly weldable material, characterized in that the step of adjusting the focus offset in the range of 1 to 10 mA. The method of claim 7, wherein the method of laminating a poorly weldable material,
After performing the lamination step, the step of repeatedly performing the preheating step and the lamination step until a predetermined number of layers of the poorly weldable material layer is formed. The method of claim 7, wherein the laminating step,
In the step of irradiating by adjusting the power of the energy beam in the range of 50 W to 1,000 W. The method of claim 7, wherein the laminating step,
In the step of irradiating by adjusting the scan speed of the energy beam in the range of 4,500 mm/s to 8,000 mm/s. The method of claim 7, wherein the preheating step,
Laying a poorly weldable material, characterized in that the step of preheating the hardly weldable material rares of the upper layer including the uppermost hardly weldable material layer to a temperature of 70% to 90% of the melting temperature of the hardly weldable material. delete

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