KR102251323B1 - 3D model stacking slicing method - Google Patents

Abstract

The present invention relates to a 3D model stack-slicing method and, more specifically, to a 3D model stack-slicing method which can improve output quality and reduce manufacturing time by outputting an outer wall part of a 3D model consisting of an outer wall part and an inner part as multiple layers and outputting the inner part with a thickness corresponding to the stacking height of the outer wall part. The present invention relates to the 3D model stack-slicing method using a 3D printer, wherein the 3D model is composed of the outer wall part and the inner part. Moreover, the output height of the inner part is formed higher than the output height of the outer wall part, and the outer wall part is output first and then the inner part is output.

Description

3D model stacking slicing method}

The present invention relates to a three-dimensional model stacked slicing method, and more specifically, the outer wall portion of a three-dimensional model consisting of an outer wall portion and an inner portion is output as a plurality of layers, and the inner portion is output in a thickness corresponding to the stacking height of the outer wall portion. The present invention relates to a 3D model stacked slicing method that can improve and reduce manufacturing time.

In general, there are various types of 3D printers that produce a predetermined three-dimensional object according to a method of manufacturing a three-dimensional object, among which the FDM (Fused Deposition Modeling) method is one of the most widely used 3D printing methods today. FDM generates a computer control signal based on a 3D drawing made by a computer program and transmits this data to a 3D printer to move the 3D printer head. And the molten material (a filament material such as ABS plastic, PLA, etc.) is sprayed according to the control signal from the nozzle of the 3D printer head, and the sprayed molten material is laminated on the flat structure. After that, a three-dimensional object is created through a cooling process, and this three-dimensional structure is characterized by a parallel pattern appearing on a planar structure by lamination.

The 3D printer's slicing process compiles the 3D model source information, such as the generated stl file, into a G-Code file, while G-Code information such as the 3D printer's moving path, output thickness, internal filling rate, printing speed, and raw materials. This is an operation to be included in the file, and the detailed formative method of the 3D model is determined according to the command set through the slicing operation. That is, according to the slicing method, it is possible to improve the work speed and the precision of the output.

In 3D printers, the higher the print thickness, the lower the print quality but the faster the print speed, and the lower the print thickness, the higher the print quality but the slower the print speed.

In the conventional method, the thickness of each layer is output differently, and the low-thickness layer is printed for the parts that require the precision of the sculpture, and the thick layer is printed for the parts that do not require high-precision, thereby securing a certain level of precision of the sculpture. I am using a slicing method that reduces the print time.

In the case of the '3D printer printing method' of Patent Document 1,'a method of printing an object using a 3D printer, the object consists of an inner filling area and an edge area, and printing of an inner filling area than the printing thickness of the edge area. A 3D printer printing method characterized by forming a thicker thickness.”, and the method of dividing the output into an inner fill area and an edge area is similar to the present invention, but the output method is not specific, so whether the expected effect will be produced during actual printing. Is not sure. In fact, in the case of a method of adjusting the output thickness by a general program, it is not easy to control the amount of material injected through the nozzle, and the quality of the output is often degraded, and the need for improved invention for this has been steadily restored.

Domestic Patent Publication No. 10-2016-0049704

Accordingly, the present invention has been devised to improve the conventional problems as described above, and in an FDM type 3D printer that outputs a shape by melt-extrusion of a filament material, the outer wall portion of a three-dimensional model consisting of an outer wall portion and an inner portion is formed of a plurality of layers. The purpose is to provide a 3D model stacked slicing method that can be printed as a layer and output in a thickness corresponding to the stacking height of the outer wall to improve the print quality, and is economical and can reduce manufacturing time.

In order to solve the above-described problem, the present invention is a ``three-dimensional model stacked slicing method using a 3D printer, wherein the three-dimensional model is composed of an outer wall portion and an inner portion, and the output height of the inner portion is formed higher than the output height of the outer wall portion. However, a three-dimensional model stacked slicing method characterized in that the outer wall portion is first output and then the inner portion is output.

In addition, the outer wall portion may be output as a plurality of layers, and the inner portion may be output with a thickness corresponding to the stacking height of the outer wall portion.

In addition, it may be characterized in that multiple outputs of the outer wall portion.

In addition, it may be characterized in that the outer wall portion is output in a layer of 2 to 4 layers.

In addition, it may be characterized in that only a part of the inner portion is filled.

In addition, it may be characterized in that the inner portion is filled with 10 vol% to 90 vol%.

In addition, in the case of outputting the inner part, the outer wall is output by changing to a nozzle part having an ejection hole having a larger diameter than the output height of the outer wall part, and at the same time, selecting the upper end of the output surface to the bottom surface of the nozzle part by plastering Imposing may be characterized in that it fills the voids between the inner portions.

In addition, the three-dimensional model stacked slicing method, characterized in that to fill the voids formed in the outer wall portion or the inner portion by outputting the inner portion and replacing the inner portion with a nozzle portion having an ejection hole having a smaller diameter than the output nozzle portion.

According to the present invention made as described above, the outer wall portion of the 3D model is output as a plurality of layers and the inner portion is output with a thickness corresponding to the stacking height of the outer wall portion, so that the outer wall portion of the 3D model can be accurately output, and the inner portion is It has the effect of shortening the printing time by printing in a thick layer.

In addition, the present invention is a method of filling the void between the outer wall portion and the inner portion by selecting the upper end of the output surface to the lower surface of the nozzle by a plastering method at the same time as printing, and the filling speed is higher than the method of ejecting and outputting the inner side. It is fast and has the effect of producing a solid 3D model by reducing the occurrence of internal voids.

In addition, when outputting the nozzle by changing the exit diameter of the nozzle and outputting it as a thick layer, the voids between the formed layers can be quickly filled.

1 shows the concept of a conventional 3D printing lamination method.
2 shows the concept of a slicing method provided by the present invention.
Figure 3 shows the progress of the present invention.
4 is a diagram illustrating a process of selecting the upper end of the output surface to the lower surface of the flat nozzle by the plastering method according to an embodiment of the present invention.
Figure 5 is a conceptual diagram of a 3D printing color change multi-nozzle system according to the present invention.
6 is a conceptual diagram showing a color change process by changing the position of the ejection orifice according to the present invention.
7 is an exploded perspective view showing a 3D printing color changing multi-nozzle system according to the present invention from the bottom.
8 is an exploded perspective view showing in more detail the noble and central axis of the 3D printing color changing multi-nozzle system according to the present invention.
9 is a front view showing a state in which the members of FIG. 8 are combined.
10 is a flow chart showing a process of transferring the body portion to the XY axis.
11 is a conceptual diagram showing a nozzle structure capable of changing the color without changing the exit position of the ejection port.
12 is a bottom view of a 3D printing color changing multi-nozzle system according to the present invention.
13 is a reference diagram showing the structure of an existing nozzle.

Hereinafter, some embodiments of the present invention will be described in detail through exemplary drawings. In adding reference numerals to elements of each drawing, the same elements are assigned the same numerals as possible even if they are indicated on different drawings. In addition, in describing an embodiment of the present invention, if it is determined that a detailed description of a related known configuration or function interferes with the understanding of the embodiment of the present invention, the detailed description thereof will be omitted.

In addition, in describing the constituent elements of an embodiment of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are only for distinguishing the component from other components, and the nature, order, or order of the component is not limited by the term. When a component is described as being "connected", "coupled" or "connected" to another component, that component may be directly connected or connected to that other component, but another component between each component May be “connected”, “coupled” or “connected”.

Hereinafter, a characteristic configuration of the present invention will be described while comparing the conventional 3D printing output method with the output method of the present invention.

Hereinafter, the laminated portion of one layer will be described as a layer.

In addition, in the description of the symbols, reference numerals 1 to 2 describe the configuration of the present invention, and reference numerals 100 to 300 are used to describe an embodiment of a nozzle structure applicable to the present invention. Accordingly, FIGS. 1 to 4 illustrate the three-dimensional model stacked slicing method according to the present invention, and FIGS. 5 to 13 illustrate an embodiment applicable to the present invention.

1 shows the concept of a 3D printing lamination method in the prior art, and FIG. (a) shows a horizontal cross section of the lamination surface. The nozzle unit is output while moving along the XY axis on the plane at the same height, and the output of one layer is completed. When viewed from the side, the three-dimensional structure produced in this way by stacking other layers on it is characterized by a parallel pattern appearing. In Figure (b), the thickness of each layer is output differently, and the parts that require precision of the sculpture are printed as a low-thick layer, and the parts that do not require high precision are printed as a thick layer to ensure the accuracy of the sculpture to some extent. A conventional slicing method for reducing the printing time is shown. In the case of outputting a portion with a relatively low precision of the molding operation, the printing speed can be increased, but the overall accuracy is not effective in the case of a work that requires precision.

FIG. 2 shows the concept of the slicing method provided by the present invention, and FIG. (a) is the same as the output height of the two layers of the outer wall 1 after outputting the outer wall portion 1 as two layers. It shows a process of outputting and filling the inner part 2 with a thickness. At this time, the height of the layer is determined by the diameter of the exit hole of the nozzle. For example, when printing a layer with a thickness of 0.4mm, the thickness of the layer is adjusted by using a nozzle part with an exit hole of 0.4mm diameter.

FIG. 2(b) shows a method of filling the inner part 2 after outputting the outer wall part 1 in duplicate as another embodiment. If the volume of the inner part 2 is large, the weight of the material to be filled in the inner part 2 increases, and accordingly, the horizontal pressure on the outer wall part 1 rises, and the outer wall part 1 cannot withstand the pressure and is likely to be destroyed. In this case, it is a method of outputting in duplicate to reinforce the outer wall portion (1). At this time, the output is not limited to the dual output, and if the force to withstand the horizontal pressure is insufficient, it may be formed in multiples until a sufficient support force is generated.

Figure 2 (C) shows a process of outputting and filling the inner portion 2 with the same thickness as the output height of the two layers of the outer wall portion 1 after outputting the outer wall portion 1 in two layers. It is a perspective view. It can be seen that the diameter of the exit hole of the nozzle portion is larger when the inner portion 2 is output than when the outer wall portion 1 is output. The outer wall part (1) is a nozzle part with a small diameter ejection port and outputs in two layers precisely, and the inner part (2) is a nozzle part with a large diameter ejection port, filling the height of two layers with one output. As for the inner part 2, since it is sufficient to simply fill the inner space, precise output is not required, and the output speed is high. In addition, compared to the method of controlling the output thickness by program, the method of controlling the output thickness by the diameter of the nozzle unit has a more constant output thickness, so the quality of the output is excellent.

Figure 2 (d) shows a process of outputting the outer wall portion 1 as two layers and then filling the inner portion 2 with the inner portion 2 at a volume ratio of 50%. It has the advantage of having sufficient strength without filling all, reducing the weight of the printout, and saving materials. The inner portion 2 can be filled with 10 vol% to 90 vol%, which can be determined according to the planar shape of the outer wall portion 1 or the strength of the material. For example, when the outer wall part (1) is output in a polygonal planar shape, it is preferable to output the inner part (2) diagonally, and if it is output in a circular or elliptical planar shape, the inner part (2) is radial and has a plurality of ribs. It is desirable to output to be formed. In addition, when the material filling the inner portion 2 contains metal powder with high strength, the filling ratio of the inner portion 2 can be reduced to produce a three-dimensional model having sufficient strength and light.

Figure 2(e) shows that the outer wall part 1 is output as two layers, and then the inner part 2 is output and filled with the same thickness as the output height of the two layers of the outer wall part 1, and then re-created layer. It shows the process of creating a 3D model by repeating the same operation at the top of the layer. In the example of Figure (e), it is composed of four layers of outer wall portion (1) and two layers of inner portion (2). It is possible to set up a program to perform a modular operation by setting to repeat the same operation. Convenience can be improved.

The nozzle part is divided into outer wall part (1) and inner part (2) according to the diameter of the exit hole, and the diameter of the nozzle part for the inner part (2) is set to be twice the diameter of the nozzle part for the outer wall part (1) and output. Can be configured to proceed. As described above, when outputting using nozzles with different ejection opening diameters for the outer wall (1) and the inner (2), the output thickness is automatically set according to the exit diameter of the nozzle, so separately through a slicer (slicing software). There is no need to set the output thickness.

In an embodiment of the present invention, the number of stacks of the outer wall portion 1 and the filling height of the inner portion 2 may be variously configured as n layers. For example, it may be configured to output the outer wall portion 1 as a layer of four layers and then fill the inner portion 2 with the same thickness as the output height of the four layers of the outer wall portion 1.

3 is a flowchart illustrating a process of the present invention and a slicing process according to an embodiment is shown in a flow chart. As shown, after loading model data (3D model source) and dividing the output range into the outer wall (1) and the inner (2), the inner part (2) has a thickness twice the output height of the outer wall (1). It shows the slicing process to set the output height. The above embodiment is an example in which the outer wall portion 1 is first output in two stages, and the inner portion 2 is output with a thickness corresponding to the stacking height of the two stages of the outer wall portion 1. At this time, there is a method of outputting by adjusting the ejection amount of the nozzle, but the method of outputting by changing to a nozzle having an ejection orifice of a corresponding diameter according to the output height is preferable, so that the output surface can be output uniformly. This is a method with excellent output quality.

4 shows that when outputting the inner part 2, the nozzle part having a diameter larger than the output height of the outer wall part 1 is changed to be output so that the output height is higher than the output height of the outer wall part 1, and the output is performed at the same time as the output. It shows the process of filling the void between the outer wall part 1 and the inner part 2 by selecting the upper end of the output surface with the lower end of the nozzle part in a plastering method.

For example, if the outer wall part 1 is output in two layers with a thickness of 0.2 mm and then the inner part 2 is filled with a thickness of 0.5 mm, the height of the outer wall part 1 is formed as 0.4 mm. The thickness of the inner portion 2 is formed to be 0.1 mm higher than that of the outer wall portion 1. At this time, when moving the nozzle part horizontally and pushing the upper end of the output surface to the bottom surface of the nozzle part in a plastering method, the 0.1mm material is pushed out by the nozzle part, and the pushed out material is pushed out to the outer wall part (1). It is filled while being pushed into the void formed between the inner portion 2 to more firmly couple the outer wall portion 1 and the inner portion 2. At this time, the nozzle unit may be moved simultaneously with the output and the selection operation may be simultaneously performed on the lower surface of the nozzle unit, or the selection operation may be performed after moving to a required part after printing.

After completing the printing of one layer, if the outer wall portion (1) and the inner portion (2) need to be filled with voids or additionally, the diameter is smaller than the nozzle portion that outputs the inner portion (2) and outputs the inner portion (2). It is possible to fill the voids formed in the outer wall portion 1 or the inner portion 2 by replacing the nozzle portion having an ejection hole of.

Hereinafter, the contents of the embodiments of the structure of the nozzle applicable to the present invention of FIGS. 5 to 13 are shown, and reference numerals 100 to 300 are identified by reference numerals for an embodiment of the structure of the nozzle.

The structure of the nozzle applicable to the present invention described above is "body part; And a plurality of filament supply units configured to input and output filaments of different colors to the body unit, wherein the body unit includes a heating block configured to apply heat to the filament, the heating block is coupled to the heating block, and the filament is introduced from the filament supply unit. A plurality of material inlet portions configured to be configured, a plurality of material outlets formed at the lower end of the heating block to communicate with the plurality of material inlet portions, and a nozzle portion disposed to be in contact with the lower end of the heating block and formed to penetrate the ejection port vertically. 3D printing color change multi-nozzle system configured to block all material outlets other than the communicated material outlets when one of the plurality of material outlets is positioned to communicate with the ejection port by moving the nozzle unit. Provides.

In addition, a central axis extending upward from the center of the nozzle unit and formed to penetrate the heating block vertically; And a step motor coupled to an upper end of the central axis; wherein the plurality of material outlets are disposed at equal intervals from the center of the central axis toward the outer side, and any one of the material outlets is rotated by rotating the nozzle unit. It may be characterized in that it is configured to communicate with the ejection port.

In addition, the body portion may be characterized in that it is configured to be movable along the X-Y axis on a plane.

In addition, the nozzle unit may be configured such that an upper end of the ejection port communicates with any one of the plurality of material discharge ports, and the lower end of the ejection port is configured to converge toward the center of the nozzle unit.

In addition, the nozzle portion may be formed in a plurality of the ejection orifices to have different diameters, and the nozzle portion may be rotated to communicate any one of the ejection orifices with any one of the plurality of material discharge ports. .

In addition, a thread formed along the outer circumferential surface of the central axis; A bearing disposed to be in contact with an upper end of the heating block; A spring disposed to be in contact with the upper end of the bearing; And an adjustment nut disposed to be in contact with the upper end of the spring; wherein the central axis passes through the heating block, the bearing, the spring, and the adjustment nut in sequence, and fastens the adjustment nut to the thread. It may be characterized in that it is configured to.

Hereinafter, the 3D printing color changing multi-nozzle system will be described in detail with reference to FIGS. 5 to 13.

Referring to FIG. 5, the body portion 100 and the body portion 100 are configured to include a plurality of filament supply portions 200 configured to input and output filaments of different colors, respectively, wherein the body portion 100 is a filament A heating block 110 configured to apply heat to the heating block 110, a plurality of material lead-in portions 120, a plurality of material lead-in portions 120 coupled to the heating block 110 and configured to lead a filament from the filament supply portion 200 A plurality of material outlets 140 formed at the lower end of the heating block 110 so as to communicate with each other, and a nozzle portion formed to be in contact with the lower end of the heating block 110 and to allow the ejection port 151 to penetrate vertically ( 150); may include.

The 3D printing color changing multi-nozzle system may include a body part 100, a filament supply part 200, and a filament spool 300. Filament spool (300) is a material of filament is wound and a plurality of filament spools (Filament spool) 300 having different colors can be arranged, each unwound from the filament spool (Filament spool) (300) Each of the filaments may be introduced into the body part 100 through the filament supply part 200.

The body portion 100 may be configured to move along the X-Y axis on a plane by being combined with a transfer device (not shown). In addition, the body portion 100 may be configured to move in the X-Y-Z axis direction or the bottom plate to move in the Z axis direction.

The filament supply unit 200 may be configured such that a pair of rollers 210 are disposed therein and the filament moves forward or backward according to the rotation of the roller 210. In addition, the filament supply unit 200 may be directly connected to the body unit 100 or may be disposed at a position spaced apart from the body unit 100 in a Bowden method.

The body portion 100 is a heating block 110, a plurality of material lead-in portion 120 coupled to the heating block 110, a plurality of material inlet portion 120 to communicate with each of the heating block 110 A plurality of material discharge ports 140 formed at the lower end, and a nozzle unit 150 disposed to be in contact with the lower end of the heating block 110 and formed so that the ejection port 151 is vertically penetrated.

The heating block 110 has an input channel 130 through which the filament passes through and is transported, and a heating wire for melting the filament may be disposed around the input channel 130. In addition, a material inlet 120 is coupled to the inlet of the input passage 130 and a material outlet 140 is formed at the outlet, so that the filament pressed by the filament supply unit 200 passes through the material inlet 120 It may be configured to melt and become a viscous liquefied state while passing through the input passage 130 and flow down through the material outlet 140. In this case, the material inlet 120, the input passage 130, and the material outlet 140 are formed in plural according to the number of collars of the filaments used.

A heat dissipation part 121 may be formed on the heating block 110 of the material introduction part 120 and above the coupling part of the heating block 110. The heat dissipation unit 121 may prevent heat radiated from the heating block 110 from being transferred to a member of a 3D printer such as the filament supply unit 200 by arranging a plurality of heat dissipation plates.

Filaments having different colors are melted and discharged from the plurality of material discharge ports 140, and the nozzle unit 150 may be formed in a shape and width capable of blocking all of the plurality of material discharge ports 140. In addition, an ejection opening 151 formed to penetrate the nozzle portion 150 vertically is disposed in the nozzle portion 150, and any one of the plurality of material outlets 140 is moved by moving the nozzle portion 150. When positioned so as to communicate with the ejection port 151, all material outlets 140 other than the communicated material outlets are blocked so that the molten filament does not flow down from the material outlets 140 other than the communicated material outlets 140. Can be configured.

In addition, referring to FIG. 5, the 3D printing color changing multi-nozzle system includes a central axis 160 formed to extend upward from the center of the nozzle unit 150 and vertically penetrate the heating block 110 and the center. Further comprising a step motor 170 coupled to the upper end of the shaft 160, the plurality of material outlets 140 are disposed at equal intervals apart from the center of the central shaft 160 toward the outer side, and the nozzle By rotating the part 150, any one of the material discharge ports 140 may be configured to communicate with the ejection port 151.

A cylindrical central axis 160 extending upwardly is formed at the center of the upper end of the nozzle unit 150, and the upper end of the central axis 160 may be coupled to the step motor 170.

The step motor 170 is a position control motor having a rotation of 1.8 degrees in one step, and can variously adjust the rotational force, rotational speed, and direction of the motor, and the frictional force between the heating block 110 and the nozzle unit 150 It is desirable to have sufficient rotational force to withstand it.

6 is a diagram illustrating a color change process by changing the position of the ejection port 151 according to the present invention, and FIGS. (a) and (b) show differences in structures when each filament of a different color is output. will be. Hereinafter, referring to FIG. 6, a colored filament drawn from the right is referred to as a right filament, and a filament of another color drawn from the left is referred to as a left filament.

Figure (a) shows the configuration when the right filament is output.When the filament is advanced from the filament supply unit 200 of the right filament, additional filaments in addition to the molten filament continuously flow into the input flow path 130 of the right filament. And a process in which the molten filament is pushed toward the lower end of the input passage 130 and the material is injected into the right material outlet 140 is shown. At this time, the nozzle unit 150 is positioned so that the ejection port 151 communicates with the right material discharge port 140 and rotates so that the melted right filament can be injected through the ejection port 151.

Figure (b) shows a configuration when the right filament is changed to the left filament during injection. When the right filament is retracted by the height of the ejection port 151 from the right filament supply unit 200, the ejection port ( The molten right filament remaining in the 151 is also retracted from the ejection port 151. And, when the filament is advanced from the filament supply unit 200 of the left filament, the molten left filament is injected into the left material outlet 140, and the nozzle unit 150 has an ejection port 151 and the left material outlet 140 The left filament, which is rotated to communicate with each other and melted, is injected through the ejection port 151.

As in the above configuration, the filament of the color before the change is retracted, so that the molten filament does not remain in the ejection port 151, so it is possible to print continuously while changing the color without creating a prime tower, thereby reducing material cost. The output speed can be improved.

Since the filament supply unit 200 is stopped and no pressure is applied except for the colored filament to be output, the molten filament does not flow down, and even if the filament flows down, it may be blocked by the nozzle unit 150.

In addition, it is preferable that each surface of the heating block 110 and the nozzle unit 150 in contact with each other is surface-treated so that the frictional force is close to zero, and the molten filament is not counted out.

In the case of outputting in the configuration of FIG. 6, the position of the exit port 151 is changed by rotating the nozzle when the color is changed. When the changed color is continuously output from the position of the color before change, the position of the changed exit port 151 is changed. The body portion 100 may move along the XY axis on the plane, so that the position of the ejection port 151 may be moved to a position continuous with the color before the change.

FIG. 10 is a flowchart illustrating a process of moving the X-Y axis on a plane when the color is changed to blue or red, and accordingly, the nozzle needs to be moved by the length A shown in FIG. 6.

7 to 9 are a thread 161 disposed on the central shaft 160 and formed along the outer circumferential surface of the central shaft 160, a bearing 164 disposed to contact the upper end of the heating block 110, the An example of the present structure further includes a spring 163 disposed to contact the upper end of the bearing 164 and an adjustment nut 162 disposed to contact the upper end of the spring 163.

At this time, the central shaft 160 passes through the heating block 110, the bearing 164, the spring 163, and the adjustment nut 162 in order, and the adjustment nut is connected to the thread 161. It may be configured to fasten 162.

The nozzle unit 150 is disposed at the lower end of the heating block 110 so as to be in contact with the nozzle unit 150, and in order to prevent material from flowing through the gap between the heating block 110 and the nozzle unit 150, the nozzle unit ( It is preferable to combine 150) to contact by applying pressure in the direction of the heating block (110). Therefore, by fastening the adjustment nut 162 to the screw thread 161 formed along the outer circumferential surface of the central shaft 160 coupled to the nozzle unit 150, the heating block 110 and the nozzle unit 150 are strengthened. Can be combined. In addition, when the nozzle unit 150 and the heating block 110 are strongly coupled by fastening the adjustment nut 162 as described above, rotation of the nozzle unit 150 may be difficult. In the bearing 164, it may be disposed to further include a spring 163 on the upper end of the bearing 164.

The spring 163 is configured such that the central shaft 160 penetrates vertically, is disposed between the adjustment nut 162 and the heating block 110, and receives a force pressed by the coil spring 163 Spring 163 may be used.

When the lower end of the spring 163 is in contact with the upper end of the heating block 110, the bearing 164 rotates in response to the rotation of the central shaft 160, It is disposed between the heating block 110 and the spring 163 to prevent rotation in contact with the top surface.

At this time, when the bearing 164 and the spring 163 are further disposed and the adjustment nut 162 is fastened, the heating block 110 and the nozzle unit ( 150 is more strongly coupled, and the central shaft 160 and the nozzle unit 150 can be easily rotated even in a pressurized state by the bearing 164.

According to a preferred embodiment of the above configuration, by fastening the adjustment nut 162 to contact the upper end of the heating block 110, the heating block 110 and the nozzle unit 150 may be configured to be in contact with each other. . In addition, it may be configured by further disposing a bearing 164 and a spring 163 between the heating block 110 and the adjustment nut 162.

11 is another example of the nozzle unit 150, in which the upper end of the ejection port 151 is in communication with any one of the plurality of material discharge ports 140, and the lower end of the ejection port 151 May be configured to converge to the center of the nozzle unit 150. The ejection port 151 may be formed to communicate with the nozzle unit 150 vertically and to converge diagonally toward the center from the top to the bottom of the nozzle unit 150. In addition, the plurality of material outlets 140 formed at the lower end of the heating block 110 are radially spaced apart from the central axis 160 at regular intervals, and the upper end of the ejection port 151 is the plurality of materials. It is formed at a position in communication with the discharge port 140, and when the nozzle unit 150 rotates around the central axis 160, the upper end of the ejection port 151 is any one of the plurality of material discharge ports 140 It can be positioned to communicate with one.

Therefore, in the structure of the nozzle unit 150 of FIG. 11, since the outlet of the ejection port 151 is formed at the center of the nozzle unit 150, even if it communicates with any one of the plurality of material discharge ports 140, the output is at the same position. It can be configured to be. In this case, it is possible to output while continuously changing the color without changing the position without moving the body part 100.

12 is a bottom view of an example according to the present invention, the nozzle unit 150 is formed in a plurality of the ejection orifices 151 to have different diameters, and the nozzle unit 150 is rotated to Any one of the ejection ports 151 may be configured to communicate with any one of the plurality of material discharge ports 140.

The ejection port 151 is formed to have a plurality of different diameters (eg, 0.2mm, 0.4mm, 0.6mm, etc.), and the plurality of ejection ports 151 are all one of the plurality of material discharge ports 140 It may be formed to be spaced apart at equal intervals from the center of the nozzle unit 150 so as to be interlocked with each other.

The configuration of the plurality of ejection orifices 151 of FIG. 12 can be applied to both the nozzle unit 150 having the configuration of FIGS. 5 to 11, and the diameter of the ejection orifice 151 can be quickly changed and output. It is possible to express more precise and various prints.

When changing from the structure of the nozzle unit 150 having the plurality of ejection ports 151 to an ejection port 151 having a different diameter during printing, the filament is retracted from the filament supply unit 200 and the inside of the output port 151 After retreating the molten filament of the nozzle unit 150 may be configured to change to an ejection port 151 having a different diameter by rotating.

13 shows the structure of an existing nozzle and will be described below in comparison with the structure of the present invention.

Figure (a) is a conventional method in which filaments of different colors are alternately injected and extruded through a nozzle whenever the output color is changed using one nozzle. In order to replace the green filament, you must remove all the red filament remaining inside the nozzle to print the green filament, so you need to print the remaining material on the nozzle to the prime tower to empty the nozzle and print the green filament. I had a hard time doing it. In the case of outputting in the method of the present invention, it is possible to output by changing the color without creating a prime tower.

Figure (b) is a conventional method of printing using a single nozzle, and in order to change the diameter of the nozzle during printing, it is necessary to replace the nozzle with a different diameter and print it, so there is a disadvantage in that it takes a replacement time. In the case of printing according to the method of the present invention, printing can be performed without replacing the nozzle, so that printing time can be shortened.

In the above, an embodiment of a three-dimensional model stacked slicing method according to the present invention and a nozzle structure applicable to the present invention has been described. If an embodiment of the nozzle structure is applied to the present invention, it is as follows.

When the outer wall portion 1 is output as two layers and then the inner portion 2 is output at the same thickness as the output height of the two layers of the outer wall portion 1, a diameter of 0.2 mm from the nozzle unit 150 The outlet 151 and the material outlet 140 are communicated to each other to output two layers of the outer wall portion 1 as a 0.2 mm thick layer, and rotate the nozzle unit 150 to obtain a 0.4 mm ejection port 151 The material outlet 140 can be communicated to each other to output and fill the inner portion 2 as a single layer. At this time, the diameter of the ejection port 151 can be quickly changed according to the rotation of the nozzle unit 150, so when the outer wall part 1 and the inner wall part 2 are printed, the output height can be changed easily and quickly. Speed can be improved. At this time, the lower end of the nozzle unit 150 is formed flat in the shape of a plate, so that it is easy to select the upper end of the output surface in a plastering method. In addition, as the nozzle unit 150 is rotated so that the ejection port 151 communicates with any one of the plurality of material discharge ports 141, the color can be changed quickly.

Therefore, when one embodiment of the nozzle structure applicable to the present invention is applied to the present invention, the diameter of the ejection port 151 and the color of the filament are easily and quickly changed according to the rotation of the nozzle unit 150, so that the outer wall While outputting different heights of the part 1 and the inner part 2, it is possible to quickly print while changing the color, and at the bottom of the nozzle part 150, the upper part of the output surface can be selected by a plastering method. There will be.

In this way, the method of physically changing the ejection opening 151 of the nozzle unit 150 and outputting is higher than the method of setting the output thickness by setting in the program, so that the thickness of the printout is constant and the quality of the printout is much better. .

In the above, even if all the constituent elements constituting the embodiments of the present invention have been described as being combined into one or operating in combination, the present invention is not necessarily limited to these embodiments. That is, within the scope of the object of the present invention, all of the constituent elements may be configured or operated by selectively combining one or more. In addition, terms such as "include", "consist of" or "have" described above mean that the corresponding component may be present unless otherwise stated, excluding other components. It should not be construed as being able to include other components. All terms, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art, unless otherwise defined. Terms generally used, such as terms defined in the dictionary, should be interpreted as being consistent with the meaning of the context of the related technology, and are not interpreted as ideal or excessively formal meanings unless explicitly defined in the present invention.

The above description is merely illustrative of the technical idea of the present invention, and those of ordinary skill in the art to which the present invention pertains will be able to make various modifications and variations without departing from the essential characteristics of the present invention. Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but to explain the technical idea, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

1: outer wall portion 2: inner portion
100: body 110: heating block
120: material entry part 121: heat dissipation part
130: input passage 140: material outlet
150: nozzle unit 151: ejection port
160: central axis 161: thread
162: adjustment nut 163: spring
164: bearing 170: step motor
200: filament supply unit 210: roller
300: Filament spool

Claims (8)

As a 3D model stacked slicing method using a 3D printer,
The 3D printer,
Body part; And a plurality of filament supply units configured to input and output different colored filaments to the body. Including, wherein the body portion is a heating block configured to apply heat to the filament, a plurality of material inlet portions coupled to the heating block and configured to be fed in the filament from the filament supply portion, the heating block to communicate with a plurality of material inlet portions, respectively A plurality of material discharge ports formed at the lower end of the heating block, and a nozzle unit disposed so as to contact the lower end of the heating block and configured to pass through the ejection ports vertically,
A central axis extending upward from the center of the nozzle unit and vertically penetrating the heating block; A step motor coupled to the upper end of the central axis; A thread formed along the outer circumferential surface of the central axis; A bearing disposed to be in contact with an upper end of the heating block; A spring disposed to be in contact with the upper end of the bearing; And an adjustment nut disposed to be in contact with the upper end of the spring;
The central axis is configured to pass through the heating block, the bearing, the spring, and the adjustment nut in sequence and connect the adjustment nut to the screw thread,
The plurality of material discharge ports are arranged at equal intervals from the center of the central axis toward the outer side, and any one of the material discharge ports communicates with the ejection port by rotating the nozzle unit, and the plurality of material discharge ports by moving the nozzle unit When any one of them is positioned to communicate with the ejection port, a 3D printing color change multi-nozzle system configured to block all material outlets other than the communicated material outlet is applied,
The three-dimensional model is composed of an outer wall portion and an inner portion,
Characterized in that the output height of the inner portion is formed higher than the output height of the outer wall portion,
3D model stacked slicing method, characterized in that first outputting the outer wall portion and then outputting the inner portion.
In claim 1,
And outputting the outer wall portion as a plurality of layers and outputting the inner portion with a thickness corresponding to the stacking height of the outer wall portion.
In claim 1,
3D model stacked slicing method, characterized in that multiple outputs of the outer wall portion.
In claim 1,
3D model stacked slicing method, characterized in that outputting the outer wall portion as a layer of 2 to 4 layers.
In claim 1,
3D model stacked slicing method, characterized in that filling only a part of the inner portion.
In clause 5,
3D model stacked slicing method, characterized in that filling the inner portion with 10vol% ~ 90vol%.
In claim 1,
In the case of outputting the inner part, the outer wall part and the outer wall part and the outer wall part and the outer wall part and the outer wall part and the outer wall part and the upper end of the output surface to be selected by a plastering method are applied to the lower surface of the nozzle part at the same time as the output by changing the output to a nozzle part having a larger diameter than the output height of the outer wall part A three-dimensional model stacked slicing method, characterized in that filling the voids between the inner portions.
In claim 1,
3D model stacked slicing method, characterized in that the inner portion is output and the inner portion is replaced with a nozzle portion having an ejection hole having a smaller diameter than the output nozzle portion to fill the void formed in the outer wall portion or the inner portion.

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