JP2010280173A - Method for manufacturing three-dimensionally shaped article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To shorten the shaping time for a shaped article without scratching the surface of the shaped article in the method for manufacturing the three-dimensionally shaped article. <P>SOLUTION: A laminate shaping device 1 includes: a shaping part 2 for shaping the three-dimensionally shaped shaping article; a power layer forming part 3, which forms a powder layer 32 by supplying powder material 31; a covering frame 4 for covering the powder layer 32 and the like; a light beam irradiating part 5 for forming a solidified layer 33 for irradiating it with light beam L; a machining removing part 6 for removing the surface layer of the shaped article 11; a brushing tool 71 for eliminating the powder material 31 around the shaped article 11 and wastes; and a controlling part for controlling respective parts. The cleaning of the shaped article 11 can be possible without developing bruises on the surface of the shaped article due to the elimination of the powder material 31 around the surface of the shaped article and the wastes with the brushing tool 71 before the removal process by the machining removing part 6 and, at the same time, the shaping time can be shortened. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a three-dimensional shaped object in which a material powder is irradiated with a light beam.

  Conventionally, a powder layer formed of a material powder is irradiated with a light beam to sinter or melt and solidify to form a solidified layer, and a new powder layer is formed on the solidified layer and irradiated with the light beam. The solidified layer is repeatedly laminated to form a modeled object, and the three-dimensional modeled object is manufactured by repeatedly removing the surface layer and unnecessary portions of the modeled object by cutting or the like during the formation of the modeled object. The method is known.

  FIG. 12A shows a cross-section of a shaped object during the removing step in such a manufacturing method. In such a manufacturing method, the material powder 31 and the cutting waste bite between the modeled object 11 and the end mill 63 during the cutting of the removal portion 38 which is a surface layer or an unnecessary part, and the surface of the modeled object 11 is damaged. . FIG. 12B shows such a scratch on the surface.

  In addition, a manufacturing method is known in which all the material powder and cutting waste around the modeled object are sucked and removed before cutting in order to prevent biting of the material powder and cutting waste at the time of cutting (for example, patents). Reference 1). However, in such a manufacturing method, since all of the material powder and the cutting waste are eliminated, the modeling time becomes long.

JP 2002-115004 A

  An object of the present invention is to solve the above-described problem, and to provide a method for producing a three-dimensional shaped object that can reduce the modeling time without causing scratches on the surface of the object.

  In order to achieve the above object, the invention of claim 1 includes a powder layer forming step of supplying a material powder to form a powder layer, and irradiating a predetermined portion of the powder layer with a light beam to sinter the powder layer. A solidified layer forming step of forming a solidified layer by solidifying or melting and solidifying the solidified layer by repeating the powder layer forming step and the solidified layer forming step. In the manufacturing method of a three-dimensional shaped article that forms a three-dimensional shaped article by inserting a removing step that removes the surface layer and unnecessary portions at least once, before the removing operation in the removing process, or before the removing process An exclusion process for eliminating material powder around the modeled object and debris generated in the removal operation is provided, and the exclusion process is performed in a range around the surface of the modeled object on which the removal operation is performed.

  According to a second aspect of the present invention, in the method for manufacturing a three-dimensional shaped article according to the first aspect, the region where the exclusion step is performed is determined based on a processing path at the time of the removal processing.

  According to a third aspect of the present invention, in the method for manufacturing a three-dimensionally shaped article according to the first or second aspect, the exclusion step is performed by an exclusion means having a brush that sweeps out the material powder and waste. .

  According to a fourth aspect of the present invention, in the method for manufacturing a three-dimensionally shaped article according to the first or second aspect, the exclusion step is performed by an exclusion means having a screw that scoops up the material powder and waste. .

  According to a fifth aspect of the present invention, in the method for manufacturing a three-dimensional shaped article according to the first or second aspect, the exclusion step is performed in a space formed by the skirt portion covering the powder layer and the skirt portion. And a suction unit that sucks the water.

  The invention of claim 6 is the method for producing a three-dimensional shaped article according to claim 1 or claim 2, wherein the exclusion step is performed by an exclusion means for ejecting a gas for blowing off the material powder and debris. is there.

  The invention of claim 7 is the method for producing a three-dimensional shaped article according to claim 1 or claim 2, wherein the removing step is performed by a first rotary cutting tool, and the removing step is performed by the first step. This is performed by using a second rotary cutting tool having a diameter smaller than that of the first rotary cutting tool and causing the second rotary cutting tool to scan along the scanning path of the first rotary cutting tool.

  The invention of claim 8 is the method of manufacturing a three-dimensionally shaped object according to claim 1 or claim 2, wherein in the exclusion step, suction nozzles arranged in rows scan the powder layer, and It is performed by sucking the material powder and scrap when positioned around the surface of the shaped object to be removed.

  According to the first aspect of the present invention, since the material powder and debris are excluded in the range around the surface of the modeled object, the surface of the modeled object can be cleaned and the modeling time can be shortened.

  According to invention of Claim 2, the area | region which performs an exclusion process can be determined easily and shortening of modeling time can be aimed at.

  According to the invention of claim 3, since the material powder and debris around the surface of the modeled object are eliminated by the brush, the modeling time can be shortened.

  According to invention of Claim 4, since the material powder and waste around the surface of a modeling thing are excluded with a screw, modeling time can be shortened.

  According to the fifth aspect of the present invention, since the material powder and debris around the surface of the modeled object are eliminated by the skirt part and the suction part, the modeling time can be shortened.

  According to the sixth aspect of the present invention, the material powder and debris around the surface of the modeled object are excluded by the excluding means for ejecting gas, so that the modeling time can be shortened.

  According to the seventh aspect of the present invention, since the material powder and debris around the surface of the modeled object are eliminated by the second rotary cutting tool, the modeling time can be shortened.

  According to the eighth aspect of the present invention, since the material powder and debris around the surface of the modeled object are eliminated by the suction nozzle, the modeling time can be shortened.

(A) is a fragmentary sectional view of the additive manufacturing apparatus used for the manufacturing method which concerns on the 1st Embodiment of this invention, (b) is a perspective view of the apparatus. (A) is a block diagram of the brush tool of the apparatus, (b) is a block diagram of the other example of the brush tool. (A) thru | or (f) is a figure which shows the manufacturing method in time series. The flowchart of the manufacturing method. Sectional drawing of the molded article at the time of the removal process in the manufacturing method. (A) is a perspective view of the final shape of a modeled object in the manufacturing method, (b) is a perspective view in the middle of modeling the modeled object, (c) is a plan view of a modeled object showing a removal region in the manufacturing method, (D) is sectional drawing of the molded article which shows the removal area | region, (e) is sectional drawing of the molded article which shows the exclusion area | region in the manufacturing method. The block diagram of the screw tool of the additive manufacturing apparatus used for the manufacturing method which concerns on the 2nd Embodiment of this invention. The block diagram of the suction device of the additive manufacturing apparatus used for the manufacturing method which concerns on the 3rd Embodiment of this invention. The block diagram of the ejection apparatus of the additive manufacturing apparatus used for the manufacturing method which concerns on the 4th Embodiment of this invention. (A) is sectional drawing of the molded article at the time of the exclusion process in the manufacturing method which concerns on the 5th Embodiment of this invention, (b) is sectional drawing of the molded article at the time of the removal process in the manufacturing method. (A) and (b) are the block diagrams of the suction nozzle of the additive manufacturing apparatus used for the manufacturing method which concerns on the 6th Embodiment of this invention. (A) is sectional drawing of the molded article at the time of the removal process in the conventional manufacturing method, (b) is a photograph of the surface damage | wound in the molded article manufactured by the manufacturing method.

(First embodiment)
The manufacturing method of the three-dimensional structure according to the first embodiment of the present invention will be described with reference to the drawings. 1A and 1B show the configuration of an additive manufacturing apparatus (hereinafter referred to as the present apparatus) used in the manufacturing method. The apparatus 1 includes a modeling unit 2 that models a three-dimensional modeled object, a powder layer forming unit 3 that supplies an inorganic or organic material powder 31 to the modeling unit 2 to form a powder layer 32, a powder layer 32, and the like. A cover frame 4 that covers the powder, a light beam irradiation unit 5 that irradiates the powder layer 32 with a light beam L to form a solidified layer 33, a cutting removal unit 6 that removes the surface layer of the modeled object 11, and the surroundings of the modeled object 11 The brush tool (exclusion means) 71 which excludes the material powder 31 and the control part (not shown) which controls each part are provided. The powder layer 32 is sintered or melted and solidified by being irradiated with the light beam L to become a solidified layer 33, and the solidified layer 33 is laminated to form the modeled article 11. In addition, the apparatus 1 includes a gas tank (not shown) that supplies atmospheric gas into the cover frame 4 and a gas recovery device (not shown) that recovers the atmospheric gas.

  The modeling unit 2 includes a lifting table 21 that moves up and down, a modeling plate 22 that is set on the lifting table 21 and on which a powder layer 32 is laid, and a modeling tank 23 that surrounds the lifting table 21 and holds the powder layer 32. is doing. The material powder 31 is, for example, a spherical iron powder having an average particle diameter of 20 μm.

  The powder layer forming unit 3 has a supply table 34 that moves up and down to raise the material powder 31, a powder tank 35 that surrounds the supply table 34, and a blade 36 that slides on the powder tank 35 and the modeling tank 23. is doing. The control unit raises the supply table 34 to raise the material powder 31, slides the blade 36 in the direction of arrow A, and supplies the material powder 31 on the supply table 34 onto the modeling plate 22 of the modeling unit 2, The material powder 31 is leveled to form a powder layer 32.

  The cover frame 4 has a window 41 that transmits the light beam L on its upper surface. The material of the window 41 is, for example, zinc selenium or the like when the light beam L is a carbon dioxide gas laser, or quartz glass or the like when the light beam L is a YAG laser, and may be any material that can sufficiently transmit the light beam L. . The inside of the cover frame 4 is filled with the atmospheric gas, and oxidation of the material powder 31 is prevented. The atmospheric gas is, for example, nitrogen gas or argon gas. A reducing gas may be used instead of the atmospheric gas. The atmospheric gas is supplied from the gas tank into the cover frame 4, and the atmospheric gas in the cover frame 4 is exhausted to the gas recovery device.

  The light beam irradiating unit 5 is provided on the cover frame 4, and a light beam oscillator 51 that emits the light beam L, a condensing lens 52 that condenses the light beam L, and the collected light beam L as powder. A galvanometer mirror 53 that scans on the layer 32 is provided. The light beam oscillator 51 is an oscillator such as a carbon dioxide laser, a YAG laser, or a fiber laser.

  The cutting removal unit 6 is a numerically controlled machine tool including a headstock 61 and capable of three-axis control, and an end mill 63 for processing is set on a spindle head 62 of the headstock 61. The end mill 63 is, for example, a two-blade ball end mill made of a cemented carbide material, and a square end mill, a radius end mill, a drill, or the like is used according to the processing shape and purpose. Each end mill 63 is housed in a tool magazine 64 and automatically replaced with a spindle head 62. The headstock 61 is moved to the cutting position by the XYZ driving unit 65.

  The brush tool 71 will be described with reference to FIG. As shown in FIG. 2A, the brush tool 71 has a brush 71 a at the tip, and is attached to the spindle head 62 to exclude the material powder 31 around the shaped article 11. The material of the brush 71a is, for example, resin or metal, and may be any material having flexibility. The brush tool 71 is stored in the tool magazine 64 when not in use. As shown in FIG. 2B, the brush tool 71 may have the brush 71a in the side surface direction, and the brush 71a may face in any direction.

  FIG. 3 shows the manufacturing operation of the three-dimensional shaped object by the apparatus 1, and FIG. 4 shows the flow. As shown in FIG. 3A, the control unit lowers the lifting table 21 by the thickness of the powder layer 32 to be formed, and then moves the blade 36 in the direction of arrow A, A material powder 31 is supplied to form a powder layer 32. This step is a powder layer forming step and corresponds to step S1 in FIG. Next, as shown in FIG. 3B, the light beam L is scanned at an arbitrary position of the powder layer 32 to sinter or melt and solidify the material powder 31, and the solidified layer 33 integrated with the modeling plate 22. Form. This step is a solidified layer forming step and corresponds to step S2 in FIG.

  In this solidified layer forming step, the i-th (i is an integer) solidified layer 33 is formed. The irradiation path of the light beam L is determined based on contour shape data of each cross section obtained by slicing STL (Stereo Lithography) data generated from a three-dimensional CAD model in advance at an equal pitch of 0.05 mm, for example. The irradiation path is preferably such that at least the outermost surface of the shaped article 11 has a high density with a porosity of 5% or less.

  The above-described powder layer forming step (step S1 in FIG. 4) shown in FIG. 3 (a) and the solidified layer forming step (step S2 in FIG. 4) shown in FIG. 3 (b) are repeated, and FIG. As shown in FIG. 3, every time a new powder layer 32 is formed, the elevating table 21 is lowered and the solidified layer 33 is laminated. The stacking of the solidified layer 33 is repeated until the number i of layers reaches a predetermined number N (steps S1 to S4 in FIG. 4). The number N of layers is obtained from the effective blade length of the end mill 63 that cuts the surface of the molded article 11. For example, if the end mill 63 is capable of cutting with a diameter of 1 mm, an effective blade length of 3 mm, and a depth of 3 mm, and the thickness of the powder layer 32 is 0.05 mm, the number N of layers is that the thickness of the laminated powder layers is 2. 50 layers of 5 mm. When the number of layers i of the solidified layer 33 reaches the determined number N, as shown in FIG. 3D, the brush tool 71 is attached to the headstock 61, and the brush tool 71 is shaped as indicated by the arrow B. 11 is moved to the periphery of the surface, and the material powder 31 is excluded. The periphery of the surface includes the side surface and the upper surface of the molded article 11. At this time, the brush tool 71 may be rotated or may not be rotated. This step is an exclusion step and corresponds to step S5 in FIG.

  When the removal step is completed, as shown in FIG. 3E, the end mill 63 is attached to the headstock 61, the end mill 63 is moved around the modeled object 11 as indicated by arrow B, and the surface of the modeled object 11 is moved to the end mill. 63 to remove. At this time, scrap 37 is generated by cutting. This process is a removal process and corresponds to step S6 in FIG. Here, after step S6 in FIG. 4, it is determined whether or not the modeling is completed (step S7). When the modeling is not completed, the layer number i is initialized to 1 (step S8), and then the process proceeds to step S1. Return and repeat above. In this way, the formation of the solidified layer 33 and the removal of the surface of the modeled object 11 are repeated until the modeling is completed as shown in FIG. When the above-described exclusion process is performed for the second time or later, the powder layer 32 includes the waste 37 generated in the removal process. Therefore, in the exclusion process, the material powder 31 and the waste 37 are excluded.

  FIG. 5 shows a cross section of the shaped article 11 in the above removal process. Since the material powder 31 and scraps 37 (see FIG. 3F, etc.) around the modeled object 11 are excluded by the exclusion process, they are not bitten between the end mill 63 and the modeled object 11 during the removing operation. The removal part 38 which is a surface layer and an unnecessary part of the modeled article 11 is smoothly removed, and the modeled article 11 is hardly damaged, and the surface can be cleaned. Moreover, since the material powder 31 and the waste 37 are removed in the range around the surface of the molded article 11, the modeling time can be shortened.

  The region where the exclusion process is performed will be described with reference to FIG. FIG. 6A shows a perspective view of the final shape of modeling in the modeled article 11, and FIG. 6B shows a point when the solidified layer 33 is laminated to the height indicated by the alternate long and short dash line K1 in FIG. FIG. FIG.6 (c) shows the planar view of the molded article 11 shown in FIG.6 (b), and shows the area | region where removal work is performed. FIG. 6D shows a cross section taken along the one-dot chain line K2 in FIG. 6C, and the removal work at this time is for the range of the removal region height Z, and is performed within the range indicated by the dotted line L. It is. FIG. 6E shows a region of the removal work before the removal work described above by a solid line M. If the entire surface of the modeled object 11 that falls within the removal area height Z is determined in order to determine the area for the exclusion work, the outer peripheral surface E of the modeled object 11 that is not subjected to the removal work is also included. Will do. Since the removal work is performed within the range where the removal work is performed, the area where the removal work is performed may be determined based on the NC program that defines the machining path at the time of the removal work, and can be easily determined by doing so.

  In the removal step, the height of the brush tool 71 may be adjusted so that the material powder 31 is sufficiently removed. However, when the material powder 31 on the solidified layer 33 is removed, the tip of the brush is the solidified layer 33. It is good to adjust so that it may become a position 0.1-1 mm deeper than the upper surface. At this time, the height of the brush tip of the brush tool 71 is measured by projecting a laser beam onto the light receiving sensor across the brush tool 71 and calculating the height from the position of the received light receiving sensor or by using an image sensor or the like. The brush tool 71 may be imaged and calculated. Alternatively, the height may be calculated by lowering the brush tool 71 attached to the headstock 61 on the pressure sensor and detecting the pressure by the brush 71a. When the brush is conductive, the brush tool 71 may be lowered on the conductive contact instead of the pressure sensor, and the energization may be detected. Further, it may be calculated from data of the dimensions of the brush tool 71 and the mounting position of the brush tool 71.

  Alternatively, a spindle head to which the brush tool 71 is attached and capable of three-axis control may be provided separately, and the removal process using the brush tool 71 and the removal process using the end mill 63 may be performed simultaneously. Since the exclusion process is performed at the same time, the modeling time can be shortened.

  Note that the powder layer 32 may be formed directly on the lifting table 21 without placing the modeling plate 22 on the lifting table 21. In that case, if the solidified layer 33 is formed in a planar shape on the lift table 21, the molded article 11 is difficult to remove from the lift table 21 after modeling, so the lower layers such as the first layer in the solidified layer 33 are dotted. It is preferable that the contact area between the lifting table 21 and the modeled object 11 is reduced.

(Second Embodiment)
A method for manufacturing a three-dimensional shaped object according to the second embodiment of the present invention will be described. The device 1 used in the present embodiment has a screw tool (exclusion means) instead of the brush tool 71 in the first embodiment. FIG. 7 shows the screw tool 72. The screw tool 72 is held in the tool magazine 64 and attached to the spindle head 62 during the removal process. The screw tool 72 has a screw-shaped side surface, and moves around the surface of the shaped article 11 like the brush tool 71 and rotates to scoop up and remove the material powder 31 and scraps 37. In order to remove the material powder 31 and the scraps 37 in the groove shape of the modeled object 11, a screw tool 72 having a diameter smaller than the width of the groove is used. At this time, the height of the tip of the screw tool 72 may be measured by an optical sensor, an image sensor, a pressure sensor, or the like as in the first embodiment. Since the material powder 31 and the waste 37 are excluded in the range around the surface of the modeled object 11 by the screw tool 72, the surface of the modeled object 11 can be cleaned and the modeling time can be shortened.

(Third embodiment)
A method for manufacturing a three-dimensional shaped object according to the third embodiment of the present invention will be described. The device 1 used in the present embodiment has a suction device (exclusion means) instead of the brush tool 71 in the first embodiment. FIG. 8 shows the suction device 73. The suction device 73 includes a skirt portion 73a that surrounds the end mill 63 and covers the powder layer 32, and a suction portion 73c that is connected by the skirt portion 73a and the tube 73b and sucks the space formed by the skirt portion 73a. . As in the first embodiment, a brush 73d is attached to the lower surface of the skirt portion 73a. The skirt portion 73a is attached to a portion of the headstock 61 that does not rotate, and does not rotate even when the end mill 63 rotates. The skirt portion 73a is held in the tool magazine 64 and is attached to the headstock 61 during the removal process. Attachment to the headstock 61 may be performed by screws or the like, or may be an automatic attachment / detachment of an electromagnetic type or a detachable button type of mechanism that is hooked when pressed from above and released when pressed again.

  In the exclusion process, the removal work on the horizontal surface of the shaped article 11 is simultaneously performed by the end mill 63 while performing the exclusion work of sucking the material powder 31 and the waste 37 by the suction device 73. At this time, the height of the tip of the brush 73d may be measured by an optical sensor, an image sensor, a pressure sensor, or the like, as in the first embodiment. Since the material powder 31 and the debris 37 are excluded in the range around the surface of the molded article 11 by the suction device 73, the surface of the molded article 11 can be cleaned, and the modeling time can be shortened. Moreover, since the exclusion process and the removal process are performed simultaneously, the modeling time can be further shortened. Moreover, since the brush 73d is attached to the lower surface of the skirt portion 73a, the material powder 31 and the waste 37 can be removed even if there is some unevenness on the horizontal surface of the molded article 11.

(Fourth embodiment)
A method for manufacturing a three-dimensional shaped object according to the fourth embodiment of the present invention will be described. The device 1 used in the present embodiment has an ejection device (exclusion means) for blowing material powder in place of the brush tool 71 in the first embodiment. FIG. 9 shows this ejection device 74. The ejection device 74 includes an ejection tool 74a having an ejection hole at the tip, and an air blowing unit 74c that is connected by the ejection tool 74a and the tube 74b to eject atmospheric gas. The ejection tool 74a is held in the tool magazine 64 and attached to the spindle head 62 during the removal process. The ejection tool 74 a moves around the surface of the modeled object 11 like the brush tool 71, and blows away the material powder 31 and the waste 37. At this time, the height of the tip of the ejection tool 74a may be measured by an optical sensor, an image sensor, a pressure sensor, or the like as in the first embodiment. As the ejection tool 74a, a drill having a hole for supplying cutting oil at the tip may be used. Since the material powder 31 and the waste 37 are excluded in the range around the surface of the modeled article 11 by the ejection device 74, the surface of the modeled article 11 can be cleaned, and the modeling time can be shortened.

(Fifth embodiment)
A method for manufacturing a three-dimensional shaped object according to the fifth embodiment of the present invention will be described. In the first embodiment, the removal step prior to the removal step is performed by the brush tool 71, but in this embodiment, the removal step is performed by an end mill instead of the brush tool 71. The end mill used here has a smaller diameter than the end mill used in the subsequent removal step. That is, as shown in FIG. 10 (a), an end mill 63a (second rotary cutting tool, hereinafter referred to as a small diameter end mill) used in the removal step is an end mill 63b used in the removal step shown in FIG. 10 (b). The diameter is smaller than (first rotary cutting tool, hereinafter referred to as a large diameter end mill). In the exclusion process, the end mill 63a is attached to the spindle head 62 (see FIG. 2 and the like), and scans while rotating along the scanning path of the large-diameter end mill 63b in the removal process. By this scanning, for example, if the outer diameter of the small-diameter end mill 63a is 6 mm and the outer diameter of the large-diameter end mill 63b is 10 mm, the outer periphery of the small-diameter end mill 63a is more than the cutting surface of the model 11 by the large-diameter end mill 63b. Since the outer side is scanned 2 mm, the material powder 31 and the scraps 37 around the surface of the modeled object 11 are blown away without cutting the modeled object 11. In the removing step, the end mill 63b is attached to the spindle head 62, and the surface layer of the shaped article 11 is removed.

  Thus, since the material powder 31 and the waste 37 are excluded in the range around the surface of the modeled article 11 by the small diameter end mill 63a, the surface of the modeled article 11 can be cleaned, and the modeling time can be shortened. Moreover, since no new equipment is required by using an end mill, the material powder 31 and the waste 37 can be eliminated at low cost.

(Sixth embodiment)
A method for manufacturing a three-dimensional shaped object according to the sixth embodiment of the present invention will be described. The apparatus 1 used in the present embodiment uses a suction nozzle instead of the brush tool 71 in the first embodiment. FIG. 11 shows the suction nozzle 75. The apparatus 1 includes a suction nozzle 75 that is arranged in a line and sucks negative pressure, and a nozzle drive unit 75 a that holds the suction nozzle 75 and slides on the powder layer 32. The suction nozzle 75 is connected to a nozzle suction portion (not shown) via a tube 75b. Each suction nozzle 75 has an open / close valve, and individually turns on and off suction.

  In the removal process, the nozzle drive unit 75a slides in the direction of arrow C, and the suction nozzle 75 sucks and removes the material powder 31 and the waste 37 when positioned around the surface of the modeled object 11 on which the removal operation is performed. . Since the material powder 31 and the debris 37 are excluded in the range around the surface of the molded article 11 by the suction nozzle 75, the surface of the molded article 11 can be cleaned, and the modeling time can be shortened. Further, since the suction nozzles 75 are arranged in a row and each of them sucks, the removal work is performed quickly, and the modeling time can be further shortened.

  In addition, this invention is not restricted to the structure of the said embodiment, A various deformation | transformation is possible in the range which does not change the meaning of invention. For example, in order to stack the powder layer 32 and the solidified layer 33, a mechanism may be used in which the modeling tank 23 around the lifting table 21 is raised without lowering the lifting table 21.

11 Modeled object 31 Material powder 32 Powder layer 33 Solidified layer 37 Scrap 63a Small-diameter end mill (second rotary cutting tool)
63b Large-diameter end mill (first rotary cutting tool)
71 Brush tool (exclusion means)
72 Screw tool (exclusion means)
73 Suction device (exclusion means)
73a Skirt part 73c Suction part 74 Ejection device (exclusion means)
75 Suction nozzle L Light beam

Claims (8)

A powder layer forming step of supplying a material powder to form a powder layer, and a solidified layer forming step of forming a solidified layer by irradiating a predetermined portion of the powder layer with a light beam to sinter or melt and solidify the powder layer And removing the surface layer and the unnecessary part of the modeled object at least once during the formation of the modeled object in which the solidified layer is laminated by repeating the powder layer forming step and the solidified layer forming step. In the manufacturing method of a three-dimensional shaped object that is inserted to form a three-dimensional shaped object,
Simultaneously with the removing operation in the removing step, or before the removing step, the material powder around the modeled object, and an elimination step for eliminating waste generated in the removing operation,
The said exclusion process is performed in the range around the surface of the molded article to which the said removal operation is performed, The manufacturing method of the three-dimensional shaped molded article characterized by the above-mentioned. 2. The method for manufacturing a three-dimensional shaped article according to claim 1, wherein the region where the exclusion step is performed is determined based on a processing path at the time of the removal processing.   The said exclusion process is performed by the exclusion means which has a brush which sweeps out the said material powder and refuse, The manufacturing method of the three-dimensional shaped molded article of Claim 1 or Claim 2 characterized by the above-mentioned.   The said exclusion process is performed by the exclusion means which has a screw which scoops up the said material powder and refuse, The manufacturing method of the three-dimensional shape molded article of Claim 1 or Claim 2 characterized by the above-mentioned.   The said exclusion process is performed by the exclusion means which has the skirt part which covers the said powder layer, and the suction part which attracts | sucks the inside of the space formed by the said skirt part, The Claim 1 or Claim 2 characterized by the above-mentioned. The manufacturing method of the three-dimensional shape molded article of description.   The said exclusion process is performed by the exclusion means which ejects the gas which blows off the said material powder and refuse, The manufacturing method of the three-dimensional shaped molded article of Claim 1 or Claim 2 characterized by the above-mentioned. The removing step is performed by a first rotary cutting tool,
In the exclusion step, a second rotary cutting tool having a smaller diameter than the first rotary cutting tool is used, and the second rotary cutting tool is scanned along the scanning path of the first rotary cutting tool. The method for producing a three-dimensional shaped object according to claim 1 or 2, wherein the method is performed.   In the exclusion step, when the suction nozzles arranged in a row scan on the powder layer and are positioned around the surface of the shaped object to be subjected to the removal operation, the material powder and waste are sucked. It is performed, The manufacturing method of the three-dimensional shape molded article of Claim 1 or Claim 2 characterized by the above-mentioned.