JP2019142024A - Additive manufacturing apparatus - Google Patents

Abstract

To provide an additive manufacturing apparatus that can improve responsiveness of temperature control during preheating of material powder and can improve modeling accuracy of a modeled article.SOLUTION: An additive manufacturing apparatus 1 comprises a stage 51 on which material powder P is placed, an elevation part 10 for hoisting and lowering the stage 51, a side wall part 52 surrounding the stage 51, and a side wall heating part that is built in the side wall part 52 and heats the side wall part 52 from the inside. The stage 51 has an upper plate part 51a for placing the material powder P on its upper surface, an upper plate heating part 51b for heating a lower surface of the upper plate part 51a, and a heat insulation part 51c interposed between the upper plate heating part 51b and the elevation part 10.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an additive manufacturing apparatus.

  Conventionally, an additive manufacturing technique is known. Additive manufacturing is a process in which an object is made from a numerical representation of a three-dimensional shape by depositing material, in contrast to repetitive manufacturing. Additive manufacturing is also called “3D printer” or “laminated modeling”, and is often realized by laminating a plurality of layers. As an example of the additive manufacturing technique, an invention relating to a technique for forming a three-dimensional layered object by irradiating an electron beam onto a powder that is a material of the three-dimensional layered object is known (see Patent Document 1 below).

  Patent Document 1 is a three-dimensional additive manufacturing apparatus that irradiates a powder with an electron beam to form a three-dimensional additive object, and includes a forming box in which the three-dimensional additive object is formed, and the outside of the forming box. An invention relating to a three-dimensional additive manufacturing apparatus provided with a heating means for preheating arranged is disclosed (see the same document, claim 1, etc.). According to this invention, since an electron beam is not used for preheating the powder, the modeling speed of the three-dimensional layered object can be increased (see the same document, paragraph 0009, etc.).

  Moreover, patent document 1 is disclosing the structure with which said modeling box is provided with the flow path through which a refrigerant | coolant flows (refer the same document and Claim 14). Cooling the modeling box by flowing a coolant through such a refrigerant flow path does not open the modeling box to the atmosphere, and in a shorter time than cooling the modeling box by natural cooling, The layered object can be taken out (see the same document, paragraph 0036, etc.).

International Publication No. 2017/0881812

  As described above, the conventional three-dimensional layered manufacturing apparatus has a low temperature control responsiveness during the preheating of the powder because the preheating heating means is disposed outside the modeling box. Further, when the modeling box is heated from the outside by the preheating heating means, the drive unit that drives the base plate provided in the modeling box in the vertical direction is heated to a high temperature. Therefore, the drive unit may be thermally expanded, and the modeling accuracy of the three-dimensional layered object on the base plate may be reduced.

  The present disclosure provides an additive manufacturing apparatus of a powder bed fusion bonding system capable of improving the temperature control responsiveness during preheating of the material powder and improving the modeling accuracy of the modeled object.

  One aspect of the present disclosure is an additive manufacturing apparatus of a powder bed fusion bonding method, which includes a stage on which material powder is placed, a lifting unit that lifts and lowers the stage, a side wall that surrounds the stage, and the side wall A side wall heating unit that heats the side wall unit from the inside, and the stage has an upper plate unit on which the material powder is placed on an upper surface, and an upper plate heating unit that heats the lower surface of the upper plate unit And a heat insulating part interposed between the upper plate heating part and the elevating part.

  According to the one aspect, it is possible to provide an additional manufacturing apparatus capable of improving the temperature control responsiveness during preheating of the material powder and improving the modeling accuracy of the modeled object.

Sectional drawing of the addition manufacturing apparatus which concerns on one Embodiment of this indication. The front view which illustrates a part of additional manufacturing part of the additional manufacturing apparatus of FIG. Sectional drawing which follows the III-III line of a part of additional manufacturing part of FIG. The front view which shows the stage and raising / lowering part of the addition manufacturing part of FIG.

  Hereinafter, an embodiment of an additive manufacturing apparatus according to the present disclosure will be described with reference to the drawings. FIG. 1 is a schematic cross-sectional view illustrating a schematic configuration of an additive manufacturing apparatus 1 according to an embodiment of the present disclosure.

  The additive manufacturing apparatus 1 of this embodiment is an additive manufacturing apparatus of a powder bed fusion bonding system, and has the following features as main features. The additive manufacturing apparatus 1 includes a stage 51 on which the material powder P is placed, an elevating unit 10 that raises and lowers the stage 51, a side wall 52 that surrounds the stage 51, and a side wall 52 that is built in the side wall 52. And a side wall heating section 53 (see FIG. 2). The stage 51 includes an upper plate portion 51a for placing the material powder P on the upper surface, an upper plate heating portion 51b for heating the lower surface of the upper plate portion 51a, and the upper plate heating portion 51b and the lifting portion 10 And a heat insulating part 51c interposed therebetween. Hereinafter, the structure of each part of the additional manufacturing apparatus 1 of this embodiment is demonstrated in detail.

  The additional manufacturing apparatus 1 includes, for example, a chamber 2, a vacuum pump 3, a material supply unit 4, an additional manufacturing unit 5, a recovery unit 6, a recoater 7, and a beam source 8. Moreover, although illustration is abbreviate | omitted, the addition manufacturing apparatus 1 may be provided with the inert gas supply part.

  The chamber 2 accommodates each part of the additional manufacturing apparatus 1 excluding the beam source 8 and the vacuum pump 3 in, for example, a vacuum part V that is an internal space depressurized from the atmospheric pressure. The chamber 2 has, for example, a transmission window 22 in which a protective glass 21 is fitted. The transmission window 22 transmits the high energy beam B irradiated from the beam source 8 arranged outside the chamber 2 and reaches the material powder P placed on the stage 51 of the additional manufacturing unit 5 inside the chamber 2. Let Although not shown, the chamber 2 may have a gas inlet connected to the inert gas supply unit.

  The vacuum pump 3 is connected to, for example, a vacuuming pipe 23 provided in the chamber 2. For example, the vacuum pump 3 discharges the air in the chamber 2 through the piping 23 for evacuation, so that the internal pressure of the chamber 2 is reduced to a vacuum pressure lower than the atmospheric pressure. That is, the vacuum pump 3 forms a vacuum part V that is a space whose pressure is reduced from the atmospheric pressure inside the chamber 2. The inert gas supply unit introduces an inert gas such as nitrogen or argon into the vacuum part V of the chamber 2 through the gas inlet of the chamber 2.

  The material supply unit 4 is, for example, a concave part surrounded by a side wall and a bottom wall. The material supply unit 4 has a stage 41 for supplying the material powder P. The bottom wall of the material supply unit 4 is configured by a material supply stage 41. The material supply unit 4 is open at the top and has an opening at the upper end of the side wall, and the material powder P is placed on the material supply stage 41. The stage 41 for material supply is provided so that it can be moved up and down at a predetermined pitch by the elevating unit 10, for example.

  Although it does not specifically limit as material powder P used for addition manufacture of the molded article M, For example, powder of metal materials, such as copper, a titanium alloy, a nickel alloy, an aluminum alloy, a cobalt chromium alloy, stainless steel, resin, such as polyamide Material powder, ceramic powder, or the like can be used. The additive manufacturing apparatus 1 of the present embodiment uses, for example, a metal material powder as the material powder P.

  The additional manufacturing unit 5 is, for example, a concave part surrounded by a side wall and a bottom wall, like the material supply unit 4 described above. The additional manufacturing unit 5 includes a stage 51 for additional manufacturing. The bottom wall of the additional manufacturing section 5 is configured by a stage 51 for additional manufacturing. The side wall of the additional manufacturing unit 5 is constituted by a side wall portion 52 that surrounds the stage 51. In the example shown in FIG. 1, the side wall of the additional manufacturing unit 5 includes a side wall portion 52 that surrounds the stage 51, an outer peripheral wall portion 54 that surrounds the outer periphery of the side wall portion 52, and the side wall portion 52 and the outer peripheral wall portion 54. And a vacuum part V formed between the two. The vacuum part V is a space between the side wall part 52 and the outer peripheral wall part 54, and is a space that is depressurized from the atmospheric pressure.

  Like the material supply unit 4, the additional manufacturing unit 5 has an opening at the upper end of the side wall and an opening at the upper end of the side wall. On the stage 51 for additional manufacturing, the material powder P supplied from the material supply unit 4 and The modeled object M manufactured by addition manufacture is mounted. The stage 51 for additional manufacture is provided so as to be lifted and lowered at a predetermined pitch by the lifting unit 10, similarly to the stage 41 for material supply described above. The opening of the additional manufacturing unit 5 and the opening of the material supply unit 4 are, for example, substantially equal in height in the vertical direction and are generally aligned in the horizontal direction.

  More specifically, the stage 51 of the additional manufacturing section 5 includes an upper plate portion 51a for placing the material powder P on the upper surface, an upper plate heating portion 51b for heating the lower surface of the upper plate portion 51a, and this upper plate heating. A heat insulating part 51c interposed between the part 51b and the elevating part 10. Further, a vacuum part V, which is a space that is depressurized from the atmospheric pressure, is formed between the side wall part 52 and the elevating part 10.

  The upper plate portion 51a is, for example, a metal flat plate member. The upper plate heating unit 51b can be configured by an appropriate heater such as a cartridge heater, a sheath heater, a ceramic heater, a ceramic fiber heater, a heating unit including a hot plate, or a high-temperature planar heating element. The upper plate heating part 51b is configured to heat the upper plate part 51a to a high temperature of about 600 ° C., for example. The heat insulating part 51c can be formed of, for example, a heat insulating brick made of a flat plate heat insulating material such as ceramic fiber, calcium silicate, rock wool or the like.

  FIG. 2 is a front view illustrating a part of the additional manufacturing unit 5 of the additional manufacturing apparatus 1 of FIG. FIG. 3 is a cross-sectional view taken along the line III-III of a part of the additional manufacturing section of FIG. The additional manufacturing apparatus 1 includes a side wall heating unit 53 that is built in the side wall unit 52 of the additional manufacturing unit 5 and heats the side wall unit 52 from the inside. The side wall part 52 is provided in the rectangular cylinder shape which surrounds the stage 51, for example. The side wall heating unit 53 can be configured by a rod-shaped or tube-shaped heater such as a cartridge heater, a sheath heater, or a ceramic heater, for example.

  The side wall heating part 53 is inserted into, for example, an insertion hole 52 a provided in the side wall part 52. The insertion hole 52a of the side wall 52 extends, for example, in a straight line from the lower end surface of the side wall 52 to the vicinity of the upper end surface. The side wall portion 52 has, for example, a plurality of insertion holes 52a provided at intervals in the circumferential direction over the entire circumference of the rectangular cylindrical side wall portion 52, and the side wall heating portion 53 is inserted into each insertion hole 52a. ing. That is, the side wall part 52 incorporates a plurality of side wall heating parts 53 along all the surfaces of the rectangular inner wall surface.

  Moreover, the additional manufacturing apparatus 1 is provided with the side wall cooling part 55 which is incorporated in the side wall part 52 and cools the side wall part 52 from the inside, for example. The side wall cooling unit 55 includes, for example, a refrigerant channel 55a formed inside the side wall unit 52, a refrigerant pipe 55b connected to the refrigerant channel 55a, and a refrigerant circulation unit (not shown). . The refrigerant channel 55 a has, for example, a refrigerant inlet 55 c and a refrigerant outlet 55 d on the lower end surface of the side wall 52, and is continuous over the entire circumference of the side wall 52.

  For example, the refrigerant flow path 55 a extends in a straight line upward from the refrigerant inlet 55 c on the lower end surface of the side wall portion 52 to the vicinity of the upper end surface of the side wall portion 52. The refrigerant flow path 55a is bent in the vicinity of the upper end surface of the side wall portion 52 and extends in the circumferential direction of the side wall portion 52, passes above the side wall heating portion 53, and is bent so as to be turned downward. . Furthermore, the refrigerant flow path 55a extends straight down to the vicinity of the lower end surface of the side wall portion 52, bends near the lower end surface of the side wall portion 52, extends toward the circumferential direction of the side wall portion 52, and again upwards. It bends so as to be folded back and extends straight up to the vicinity of the upper end surface of the side wall 52. As described above, the refrigerant flow path 55a meanders while being alternately and repeatedly folded in the vicinity of the upper end surface and the lower end surface of the side wall portion 52, passes above the plurality of side wall heating portions 53, and passes through the entire circumference of the side wall portion 52. The refrigerant outlet 55d at the lower end surface of the side wall portion 52 opens to the lower end surface of the side wall portion 52.

  The refrigerant pipe 55b connects the refrigerant supply port of the refrigerant circulation device (not shown) and the refrigerant inlet 55c of the refrigerant channel 55a, and connects the refrigerant outlet 55d of the refrigerant channel 55a and the refrigerant recovery port of the refrigerant circulation device. doing. The refrigerant circulation device supplies the refrigerant from the refrigerant supply port to the refrigerant inlet 55c of the refrigerant channel 55a through the refrigerant tube 55b, and supplies the refrigerant from the refrigerant outlet 55d of the refrigerant channel 55a through the refrigerant tube 55b to the refrigerant recovery port. To collect. As the refrigerant, for example, a cooling liquid such as cooling water or a cooling gas such as helium gas or ammonia gas can be used.

  The additive manufacturing apparatus 1 according to the present embodiment includes, for example, an outer peripheral wall cooling section 56 that is built in the outer peripheral wall section 54 and cools the outer peripheral wall section 54 from the inside. The outer peripheral wall cooling section 56 is not shown in the figure, for example, similarly to the above-described side wall cooling section, a refrigerant flow path 56a formed inside the outer peripheral wall section 54, a refrigerant pipe 56b connected to the refrigerant flow path 56a, and the like. And a refrigerant circulating part. The refrigerant pipe 56b has a refrigerant inlet 56c and a refrigerant outlet 56d. Since the outer peripheral wall cooling part 56 of the outer peripheral wall part 54 has the same configuration as the side wall cooling part 55 of the side wall part 52 described above, the corresponding configuration of the side wall cooling part 55 shown in FIGS. The description is omitted. The outer peripheral wall portion 54 does not have the insertion hole 52 a and is different from the side wall portion 52 in that a heating portion such as the side wall heating portion 53 is not incorporated.

  FIG. 4 is a front view showing an example of the stage 51 and the lifting unit 10 of the additional manufacturing unit 5 shown in FIG. As described above, the stage 51 has a configuration in which the upper plate portion 51a, the upper plate heating portion 51b, and the heat insulating portion 51c are stacked and integrally connected. For example, a flat metal upper plate portion 51a is disposed at the top of the stage 51, and an upper plate heating portion 51b configured by, for example, a flat plate heater is disposed so as to contact the lower surface of the upper plate portion 51a. ing. Moreover, the heat insulation part 51c comprised by the flat heat insulating material is arrange | positioned so that the lower surface of the upper board heating part 51b may be touched.

  The elevating unit 10 includes, for example, a drive motor 11, a ball screw 12, a base unit 13, and a shaft 14. The drive motor 11 rotates the ball screw 12 to move forward or backward in the axial direction. The ball screw 12 is arranged with its axial direction coinciding with the raising / lowering direction of the stage 51. The base unit 13 supports the stage 51 that moves up and down through the shaft 14 by, for example, advancement and retraction of the ball screw 12. The shaft 14 is supported by the base portion 13, and the upper end portion is fixed to the heat insulating portion 51 c of the stage 51 to support the stage 51. The shaft 14 may support the heat insulating part 51c of the stage 51 through a plate fixed to the upper end part.

  With such a configuration, the elevating unit 10 of the additional manufacturing unit 5 shown in FIG. 1 supports the stage 51 so as to be elevable. Moreover, the raising / lowering part 10 of the material supply part 4 is also supporting the stage 41 so that raising / lowering is possible by the structure similar to the raising / lowering part 10 of the addition manufacturing part 5. FIG.

  The collection part 6 is a concave part surrounded by a side wall and a bottom wall, for example. In the illustrated example, the bottom wall of the recovery unit 6 is fixed to the lower end of the side wall, but may be configured by a stage that can be raised and lowered, like the material supply unit 4 and the additional manufacturing unit 5. The collection unit 6 is open at the top and has an opening at the upper end of the side wall. The opening of the collection unit 6 and the opening of the additional manufacturing unit 5 are approximately equal in height in the vertical direction and are generally aligned in the horizontal direction. The collection unit 6 accommodates and collects excess material powder P supplied from the material supply unit 4 to the additional production unit 5 by the recoater 7, for example.

  The recoater 7 is provided so as to be movable in the horizontal direction generally along the openings of the material supply unit 4 and the additional manufacturing unit 5 by an appropriate moving mechanism, for example. The recoater 7 is provided so as to reciprocate in the moving direction. When the recoater 7 supplies the material powder P from the material supply unit 4 to the additional manufacturing unit 5, the recoater 7 opens the opening of the material supply unit 4 and the additional manufacturing unit 5 from the position on the near side of the opening of the material supply unit 4. It moves across the opening to a position facing the opening of the collection unit 6.

  As the beam source 8, for example, an electron beam source that generates an electron beam with a maximum output of several kW in a vacuum or a laser light source that generates a laser with an output of several tens to several kW can be used. The beam source 8 of the additive manufacturing apparatus 1 of the present embodiment is a laser light source that generates, for example, a single mode fiber laser having a wavelength of 1080 nm and an output of 500 W, that is, a fiber laser having a Gaussian energy intensity distribution. When the beam source 8 is an electron beam source, the beam source 8 may be arranged in the chamber 2.

  Hereinafter, the operation of the additive manufacturing apparatus 1 of the present embodiment will be described.

  In order to perform the additional manufacturing of the shaped article M by the additional manufacturing apparatus 1 of the present embodiment, first, the air inside the chamber 2 is discharged by the vacuum pump 3 and the inside of the chamber 2 is depressurized from the atmospheric pressure to be in a vacuum state. To. Next, the stage 51 of the additional manufacturing unit 5 is lowered from the opening at the upper end of the side wall at a predetermined pitch so that a predetermined amount of the material powder P for additional manufacturing can be accommodated in the additional manufacturing unit 5. Next, the stage 41 of the material supply unit 4 is raised at a predetermined pitch, and a predetermined amount of the material powder P for additive manufacturing is pushed up above the opening. Next, the recoater 7 is moved so as to cross the opening of the material supply unit 4, and the material powder P pushed up above the opening of the material supply unit 4 is moved to the additional manufacturing unit 5 by the recoater 7.

  Further, the recoater 7 is moved so as to cross the opening of the additional manufacturing section 5, and the material powder P is introduced into the opening of the additional manufacturing section 5 by the recoater 7 and placed on the stage 51 of the additional manufacturing section 5. Then, the recoater 7 spreads the material powder P evenly and evenly on the height of the opening of the additional manufacturing section 5. At this time, the excess material powder P is introduced into the opening of the recovery unit 6 by the recoater 7, accommodated in the recovery unit 6 and recovered. Thereafter, the recoater 7 is moved in the reverse direction to return to the original position.

  Here, as described above, the powder bed fusion bonding type additive manufacturing apparatus 1 of the present embodiment includes the stage 51 on which the material powder P is placed, the elevating unit 10 for moving the stage 51 up and down, and the stage 51. The surrounding side wall part 52 and the side wall heating part 53 which is incorporated in this side wall part 52 and heats this side wall part 52 from the inside are provided. The stage 51 includes an upper plate portion 51a for placing the material powder P on the upper surface, an upper plate heating portion 51b for heating the lower surface of the upper plate portion 51a, and the upper plate heating portion 51b and the lifting portion 10 And a heat insulating portion 51c interposed therebetween.

  With this configuration, the additive manufacturing apparatus 1 can efficiently heat the side wall portion 52 by the side wall heating portion 53 built in the side wall portion 52. Therefore, the additive manufacturing apparatus 1 can improve the responsiveness of the temperature control during the preheating of the material powder P by the side wall portion 52, as compared with the conventional three-dimensional layered modeling apparatus that heats the modeling box from the outside.

  Further, as described above, the additive manufacturing apparatus 1 can efficiently heat the upper plate portion 51a constituting the uppermost portion of the stage 51 by the upper plate heating portion 51b built in the stage 51. Therefore, the additive manufacturing apparatus 1 can improve the responsiveness of the temperature control during the preheating of the material powder P by the side wall portion 52, as compared with the conventional three-dimensional layered modeling apparatus that heats the modeling box from the outside.

  In addition, the stage 51 of the additive manufacturing apparatus 1 has the heat insulation part 51c interposed between the upper board heating part 51b and the raising / lowering part 10 as mentioned above. Thereby, the temperature rise of each member which comprises the raising / lowering part 10 can be suppressed, the thermal expansion of each member can be suppressed, and the stage 51 can be raised / lowered with high precision. In addition manufacturing apparatus 1 of this embodiment, in addition manufacturing part 5, preheats material powder P to high temperature of about 500 ° C or more, for example, about 600 ° C. However, by thermally insulating the upper plate heating unit 51b and the lifting unit 10 by the heat insulating unit 51c interposed between the upper plate heating unit 51b and the lifting unit 10, the temperature of the lifting unit is 100 ° C. or less, For example, the temperature can be maintained at about 50 ° C.

  Next, high energy such as a laser or an electron beam is applied from the beam source 8 to a predetermined region of the preheated material powder P on the stage 51 of the additional manufacturing unit 5 based on the three-dimensional shape data of the model M. Irradiate beam B. As a result, the material powder P in a predetermined region is melt-bonded to form a part of the shaped object M. At this time, as described above, the additional manufacturing apparatus 1 can insulate the space between the upper plate heating unit 51b and the lifting unit 10 by the heat insulating unit 51c and can move the stage 51 up and down with high accuracy. Compared with the conventional three-dimensional additive manufacturing apparatus heated from the outside, the modeling precision of the molded article M can be improved.

  Moreover, the additional manufacturing apparatus 1 of this embodiment is provided with the side wall cooling part 55 which is incorporated in the side wall part 52 and cools this side wall part 52 from the inside as mentioned above. With this configuration, the side wall part 52 can be efficiently cooled by the side wall cooling part 55 built in the side wall part 52. Therefore, the additional manufacturing apparatus 1 can cool the side wall portion 52 in a short time. Furthermore, the responsiveness of the temperature control at the time of preheating can be further improved by using the side wall heating part 53 and the side wall cooling part 55 together when preheating the material powder P.

  Moreover, the additional manufacturing apparatus 1 of this embodiment is provided with the vacuum part V which is the space decompressed from atmospheric pressure as mentioned above. The vacuum part V is formed between the side wall part 52 and the elevating part 10. With this configuration, even when the side wall 52 is heated by the side wall heating unit 53 and becomes a high temperature, the vacuum part V formed between the side wall 52 and the elevating unit 10 causes the side wall 52 and the elevating unit 10 to It is possible to insulate the gap and suppress the temperature rise of the elevating unit 10. Therefore, it is possible to raise and lower the stage 51 with high accuracy while suppressing thermal expansion of each member constituting the elevating unit 10.

  Further, as described above, the additive manufacturing apparatus 1 of the present embodiment includes the outer peripheral wall portion 54 surrounding the outer periphery of the side wall portion 52, and the vacuum portion V is formed between the side wall portion 52 and the outer peripheral wall portion 54. ing. With this configuration, even when the side wall 52 is heated by the side wall heating unit 53 and becomes a high temperature, the side wall 52 and the outer peripheral wall 54 are formed by the vacuum part V formed between the side wall 52 and the outer peripheral wall 54. And the temperature rise of the outer peripheral wall portion 54 can be suppressed. Thereby, it can prevent that the heat of the side wall part 52 affects the circumference | surroundings of the addition manufacturing part 5. FIG.

  Moreover, the additional manufacturing apparatus 1 of this embodiment is provided with the outer peripheral wall cooling part 56 which is incorporated in the outer peripheral wall part 54 and cools this outer peripheral wall part 54 from the inside as mentioned above. With this configuration, the outer peripheral wall portion 54 can be efficiently cooled by the outer peripheral wall cooling portion 56 built in the outer peripheral wall portion 54. Therefore, it can prevent more effectively that the heat of the side wall part 52 affects the circumference | surroundings of the addition manufacturing part 5. FIG.

  Further, when the additional manufacturing apparatus 1 includes an inert gas supply unit that introduces an inert gas into the vacuum part V, the additional manufacturing apparatus 1 is manufactured by introducing an inert gas into the vacuum part V in the cooling process after the completion of the additional manufacturing. The shaped object M and other members can be efficiently cooled.

  As described above, according to the present embodiment, the addition of a powder bed fusion bonding method that can improve the responsiveness of temperature control during preheating of the material powder P and improve the modeling accuracy of the model M. The manufacturing apparatus 1 can be provided.

  The embodiment of the present invention has been described in detail with reference to the drawings, but the specific configuration is not limited to this embodiment, and there are design changes and the like without departing from the gist of the present invention. They are also included in the present invention.

DESCRIPTION OF SYMBOLS 1 Additional manufacturing apparatus 10 Lifting part 51 Stage 51a Upper board part 51b Upper board heating part 51c Heat insulation part 52 Side wall part 53 Side wall heating part 54 Outer wall part 55 Side wall cooling part 56 Outer wall cooling part P Material powder V Vacuum part

Claims (6)

An additive manufacturing apparatus of powder bed fusion bonding method,
A stage on which the material powder is placed, an elevating part that raises and lowers the stage, a side wall that surrounds the stage, and a side wall heating part that is built in the side wall and heats the side wall from the inside,
The stage includes an upper plate portion on which the material powder is placed on an upper surface, an upper plate heating portion that heats the lower surface of the upper plate portion, and a heat insulation interposed between the upper plate heating portion and the elevating portion. And an additional manufacturing apparatus.   The additive manufacturing apparatus according to claim 1, further comprising a side wall cooling unit that is built in the side wall portion and cools the side wall portion from the inside. It has a vacuum part that is a space that is depressurized from atmospheric pressure
The additive manufacturing apparatus according to claim 1, wherein the vacuum part is formed between the side wall part and the elevating part. Comprising an outer peripheral wall surrounding the outer periphery of the side wall;
The additive manufacturing apparatus according to claim 3, wherein the vacuum part is formed between the side wall part and the outer peripheral wall part.   The additive manufacturing apparatus according to claim 4, further comprising an outer peripheral wall cooling part that is built in the outer peripheral wall part and cools the outer peripheral wall part from the inside.   The additive manufacturing apparatus according to any one of claims 3 to 5, further comprising an inert gas supply unit that introduces an inert gas into the vacuum unit.

Images