JP2017035865A - Heating assistance 3d printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide means for solving the problem of having different adhesive strength depending on positions such that since a 3D printer has very many drawing paths, a path portion of initial drawing is cooled and solidified, further, since even when a resin is melted, in a portion having a large cooling speed, an adhesive strength is small, and still further, since the strength depends on a temperature of an underlayer, depending on a position, the adhesive strength is different.SOLUTION: A light heater portion 6 is disposed in an immediate front of a melting nozzle 1 in the direction of movement. This is a method of heating with laser light 5.1 using a laser light source 5 or the like. An underlayer 3 immediately before a molten resin is laminated is heated to a semi-molten state to improve the adhesiveness between a molten laminated resin 2 and the underlayer 3 to improve the strength of a molded article. Because this is performed immediately before laminating by heating, a variation due to a position to be laminated can be reduced, and because the adhesiveness and a fusion property with the underlayer 3 are improved, an accuracy of an interlayer surface shape can be also improved.SELECTED DRAWING: Figure 2

Description

The present invention relates to a heat-assisted modeling method in a three-dimensional printer.

In the conventional 3D printer, especially in the melt lamination method, when one layer is laminated, the surface of the resin is cooled, and even if a new melt layer is laminated thereon, the adhesion is bad and the worst case Had the problem of peeling easily between layers. Further, when the resin is laminated after being cooled, the laminated surface has a large roughness, which causes problems such as deterioration of shape accuracy and damage of aesthetic shape modeling.

Optical assist pattern forming method and apparatus, Japanese Patent Laid-Open No. 9-306876 Incident light generates evanescent light waves at the tip of an optical fiber. An etching gas or a deposition source gas is introduced into the chamber from a gas storage cylinder, and the gas is transported to the tip through the hollow portion of the optical fiber to cause etching or film deposition at the evanescent light wave irradiation position. Because of the method of assisting the gas reaction with light, the fundamental principle is different from this method of adhering the molten resin. This is a method for producing a multistage stepped element or a mold for producing the element, a method for producing a multistage stepped element, or a method for producing the mold for producing the element, which is different from the present proposal. The operating principle is different because of the manufacturing method of the semiconductor device and Japanese Patent Application Laid-Open No. 6-37117. 3D Printer Special Review 2013-507275 This method is a method of heating a green material before modeling, and the principle of this method is different from the method of heating a modeling member.

In the 3D printer, the path is subdivided so that the shape of one layer is cut and the area can be filled with the diameter of the resin discharge nozzle. Therefore, there are very many drawing passes, and the first pass portion of drawing is cooled and solidified. In addition, even if the resin is melted, the portion with a high degree of cooling has low adhesive strength. Further, since the strength depends on the temperature of the lower layer, there is a problem that the adhesive strength varies depending on the location. In addition, the cooled lower layer has a problem that the surface shape accuracy deteriorates because the melted portion does not match. FIG. 1 shows the situation. The molten resin emerging from the nozzle (1) forms a new layer (2). However, it does not merge with the cold lower layer (3).

In the present invention, the adhesive strength between the melted part and the lower layer to be laminated can be improved by heating the lower layer with a light source to bring it into a semi-molten state immediately before lamination. Moreover, surface accuracy improves also by combining with a lower layer.

In order to achieve the above object, according to the present invention, as shown in FIG. 2, a light heating section is provided immediately before the moving direction of the melting nozzle. It uses a laser light source (5) or the like and is heated with a laser beam (5.1) or the like. As a result, the lower layer immediately before laminating the molten resin is heated to a semi-molten state (6), thereby improving the adhesion between the molten laminated resin and the lower layer, and improving the strength of the shaped article. This is because heating is performed immediately before stacking, and variations due to the stacking location can be reduced. In addition, since the adhesion and fusion with the lower layer are improved, the surface shape accuracy between the layers is also improved.

The lower layer immediately before laminating the molten resin is heated to a semi-molten state to improve the adhesion between the molten laminated resin and the lower layer, thereby improving the strength of the shaped article. This is because heating is performed immediately before stacking, and variations due to the stacking location can be reduced. In addition, since the adhesion and fusion with the lower layer are improved, the surface shape accuracy between the layers is also improved.

The molten resin emerging from the nozzle (1) forms a new layer (2). However, it does not merge with the cold lower layer (3). A light heating unit is provided immediately before the moving direction of the melting nozzle. It uses a laser light source (5) or the like and is heated with a laser beam (5.1) or the like. As a result, the lower layer immediately before laminating the molten resin is heated to a semi-molten state (6), thereby improving the adhesion between the molten laminated resin and the lower layer, and improving the strength of the shaped article.

Heating can be performed from the above method, lateral direction, and forward direction.

As a heating method, a laser, a lamp, or an electron beam can be used.

In the case of light heating, the light source can be guided to the nozzle tip by an optical fiber. In order to heat an arbitrary position, it can be rotated 360 degrees using a rotating mirror or the like. It is also possible to heat an arbitrary position from the top by a galvanometer mirror.

Using a laser of 100 mw output and wavelength of 532 nm, laser light was guided by an optical fiber in front of the nozzle of the 3D printer, and the lower layer was condensed and heated by the lens before discharging the resin. As a result, the strength and surface roughness were improved by 10% or more.

It can be applied to a general melting type 3D printer.

The above proposal can also be applied to the case of laminating powders.

1: Nozzle 2: New layer 3: Lower layer (laminated layer)
5: Laser light source 5.1: Laser light 6: Heating area

Claims (1)

Immediately before the new layer is laminated, the lower layer is heated by a heating source such as a light source to bring the lower layer into a semi-molten state.