Unit structure for 3D printing and product manufactured using same

Abstract

A unit structure for 3D printing according to the present invention is a unit structure having an infill pattern, wherein the infill pattern includes: a base portion; a protrusion portion protruding from the base portion; a plurality of line portions formed in a shape corresponding to the outline of the protrusion portion; and a connecting portion disposed between the base portion and the plurality of line portions and connecting some of the plurality of line portions.

Description

Unit structures for 3D printing and products manufactured using the same

[0001] The present invention relates to a unit structure for 3D printing and an article manufactured using the same.

[0002] In 3D printing, "infill" or "internal filling" refers to filling the internal space of a product's shell (frame). Common patterns include lines, triangles, squares, hexagons, grids, and gyroids. Because these infill patterns affect the final product's mechanical properties, such as strength and elongation, as well as its manufacturing cost and weight, finding the optimal infill pattern is crucial.

[0003]

[0004] The purpose of the present invention is to provide a unit structure for 3D printing having an infill pattern capable of improving mechanical properties and weight reduction, and an article manufactured using the same.

[0005] A unit structure for 3D printing according to the present invention is a unit structure having an infill pattern, wherein the infill pattern includes: a base portion; a protrusion portion protruding from the base portion; a plurality of line portions formed in a shape corresponding to the outline of the protrusion portion; and a connecting portion disposed between the base portion and the plurality of line portions and connecting some of the plurality of line portions.

[0006] Additionally, the above infill pattern can be defined on a rectangular or square plane.

[0007] Additionally, the outline of the base portion may be formed by a first straight line parallel to the bottom of the plane.

[0008] In addition, the outline of the protrusion is formed by a first section extending along the circumference of the first oval from a first point closer to the second oval among two points where the first straight line intersects the first oval to a second point where the first oval and the third oval intersect; a second section extending along the circumference of the third oval from the second point to a third point where the second oval intersects the third oval; and a third section extending along the circumference of the second oval from the third point to a fourth point closer to the first oval among two points where the first straight line intersects the second oval, wherein the second straight line may be located between the first straight line and the third straight line.

[0009] Additionally, the line portion may be formed in a shape corresponding to the circumference of the third oval based on a straight line connecting the second point and the third point.

[0010] Additionally, the distance between the base of the plane and the first straight line may be 1.5 to 2.5 times the thickness of the line portion.

[0011] Additionally, the distance between the base of the plane and the third straight line may be 3 to 5 times the thickness of the line portion.

[0012] Additionally, the angle formed by the straight line connecting the center of the first or second ellipse and the center of the third ellipse with respect to the second straight line may be greater than 0° and less than or equal to 45°.

[0013] Additionally, the infill ratio can be between 60% and 100%.

[0014] On the other hand, a unit structure for 3D printing according to the present invention is a unit structure having an infill pattern, wherein the infill pattern includes: a base portion; a protrusion portion protruding from the base portion; and a plurality of line portions formed in a shape corresponding to the outline of the protrusion portion.

[0015] Additionally, the above infill pattern can be defined on a rectangular or square plane.

[0016] Additionally, the outline of the base portion may be formed by a first straight line parallel to the bottom of the plane.

[0017] In addition, the outline of the protrusion is defined as a first section extending from a first point located at the center of the base of the first isosceles triangle to a second point located at the center of the hypotenuse of the first isosceles triangle, which is closer to the second isosceles triangle, among the hypotenuses of the first isosceles triangle, when a first isosceles triangle and a second isosceles triangle having bases on the first straight line and touching each other and a third isosceles triangle having both lower vertices matching the upper vertices of the first isosceles triangle and the upper vertices of the second isosceles triangle, to a third section extending from the third section to a fourth section extending from the fourth section to a fifth section extending from the fourth section to a fifth section extending from the fourth section to the upper vertex of the second isosceles triangle. It can be formed by a fourth section that extends from the fifth point to the seventh point located at the center of the base of the second isosceles triangle, through the sixth point located at the center of the hypotenuse of the second isosceles triangle that is closer to the first isosceles triangle.

[0018] In addition, the first section may extend along the circumference of an ellipse having its center on a straight line connecting the first point and the third point while passing through the first to third points, and the fourth section may extend along the circumference of an ellipse having its center on a straight line connecting the fifth point and the seventh point while passing through the fifth to seventh points.

[0019] Additionally, spline interpolation may be applied based on the first to fourth points for the first and second sections, and spline interpolation may be applied based on the fourth to seventh points for the third and fourth sections.

[0020] Additionally, the distance between the base of the plane and the base of the third isosceles triangle may be 3 to 5 times the thickness of the line portion.

[0021] Additionally, the distance between the base of the plane and the center of gravity of the third isosceles triangle may be 3.5 to 6.5 times the thickness of the line portion.

[0022] Additionally, the infill ratio can be between 60% and 100%.

[0023] On the other hand, a unit structure for 3D printing according to the present invention is a unit structure for 3D printing having an infill pattern, wherein the infill pattern includes a plurality of line portions, and the plurality of line portions are formed in a form segmented by a function graph having at least two inflection points and a repeating pattern generated based on a change in an x-intercept and a parallel translation along the y-axis with respect to the function graph.

[0024] Additionally, the above multiple line sections can be formed in a form divided by the function graphs below.

[0025] y n =(ax-αn)(bx-β)(cx-γ)(dx-δ)(ex-ε)+Cn; sweet y nis a fourth or fifth order function; a, b, c, d, α, C are non-zero real numbers; e, β, γ, δ, ε are real numbers; n is an integer

[0026] Additionally, the above multiple line sections can be formed in a form divided by the function graphs below.

[0027] y n =(0.6x-(0.5-0.3n)(0.6x-1)(0.6x-1.5)(0.6x-2.5)(0.6x-(3.5-0.3n))+0.8n, where n is an integer greater than or equal to 0;

[0028] y n =(0.6x-(0.5-0.3n)(0.6x-1)(0.6x-1.5)(0.6x-(2.5+0.1n))(0.6x-(3.5-0.3n))+0.8n, where n is an integer less than 0

[0029] Additionally, the above multiple line sections can be formed in a form divided by the function graphs below.

[0030] y n =0.05((3x-(1-0.9n))(x-3)(x(2 + 0.3n))(x-4)(x(5.8-0.3n))+0.8n, where n is an integer

[0031] Additionally, the infill ratio can be between 60% and 100%.

[0032] Furthermore, the present invention provides an article manufactured by 3D printing using the unit structure described above.

[0033] The unit structure for 3D printing according to the present invention and the article manufactured using the same can improve mechanical properties and weight reduction through an infill pattern inspired by the structure of the shell of a beetle.

[0034] FIG. 1 is a perspective view of a unit structure for 3D printing according to one embodiment of the present invention.

[0035] FIG. 2 is a front view of a unit structure for 3D printing according to one embodiment of the present invention.

[0036] FIG. 3 illustrates a method for forming the outline of a protrusion of a unit structure for 3D printing according to one embodiment of the present invention, and illustrates a case where α is 25°.

[0037] Figure 3a shows the case where α is 15°.

[0038] Figure 3b shows the case where α is 45°.

[0039] FIG. 4 shows the results of a compressive strength test on a unit structure according to one embodiment of the present invention and a unit structure manufactured using a commonly used infill pattern in the past.

[0040] Figures 5a and 5b show the results of testing the compressive strength according to the extrusion speed for a unit structure according to one embodiment of the present invention and a unit structure manufactured using a conventional line pattern.

[0041] FIG. 6 is a perspective view of an assembly composed of unit structures for 3D printing according to one embodiment of the present invention.

[0042] FIG. 7 is an example of an article manufactured using a unit structure for 3D printing according to one embodiment of the present invention.

[0043] FIG. 8 is a perspective view of a unit structure for 3D printing according to another embodiment of the present invention.

[0044] FIG. 9 is a front view of a unit structure for 3D printing according to one embodiment of the present invention.

[0045] FIG. 10 illustrates a method for forming the outline of a protrusion of a unit structure for 3D printing according to another embodiment of the present invention.

[0046] FIG. 11 is a perspective view of an assembly composed of unit structures for 3D printing according to another embodiment of the present invention.

[0047] FIG. 12 is a perspective view of a unit structure for 3D printing according to another embodiment of the present invention.

[0048] FIG. 13 is a perspective view of an assembly composed of unit structures for 3D printing according to another embodiment of the present invention.

[0049] Referring to the drawings, a unit structure for 3D printing according to each embodiment of the present invention is described in detail.

[0050]

[0051] Example 1

[0052] FIG. 1 is a perspective view of a unit structure (10) for 3D printing according to one embodiment of the present invention.

[0053] Referring to FIG. 1, a unit structure (10) for 3D printing according to one embodiment of the present invention has an infill pattern defined in the xy plane, and the pattern may be extended in the z-axis direction to form a rectangular parallelepiped or a regular hexahedron. For example, the unit structure (10) may be formed through a process of repeatedly stacking infill patterns along the z-axis direction.

[0054] The infill pattern of the unit structure (10) for 3D printing according to one embodiment of the present invention is inspired by the shell structure of "Phloeodes Diabolicus" belonging to the order Coleoptera, and is described in more detail with reference to FIG. 2.

[0055] Figure 2 is a front view of a unit structure (10) for 3D printing according to one embodiment of the present invention.

[0056] Referring to FIG. 2, the infill pattern may include a base portion (11), a protrusion portion (12) protruding from the base portion (11), a plurality of line portions (13) formed in a shape corresponding to the outline of the protrusion portion (12), and a connecting portion (14) arranged between the base portion (11) and the line portion (13).

[0057] The base portion (11) is a region corresponding to the lower portion when viewed in FIG. 2, and the outline of the base portion (11) can be formed by a first straight line (L1) parallel to the x-axis. That is, the base portion (11) can be formed by applying a material to the region between the bottom of a rectangular or square plane where the infill pattern is defined and the first straight line (L1).

[0058] The thickness of the base portion (11), i.e., the distance (D1) between the bottom of the plane and the first straight line (L1), may be about 1.5 to about 2.5 times the thickness (T) of the line portion (13) described later, and preferably about 2 times.

[0059] The protrusion (12) is formed in a shape that protrudes from the base (11), and the outline of the protrusion (12) can be formed by three oval shapes.

[0060] In this regard, with more specific reference to FIG. 3, two ovals (E1, E2) (hereinafter referred to as “first oval (E1)” and “second oval (E2)”, respectively) that are spaced apart and have centers on a second straight line (L2) parallel to a first straight line (L1) and a third oval (E3) that has a center on a third straight line (L3) parallel to the second straight line (L2) and is tangent to the first oval (E1) and the second oval (E2) can be defined. The second straight line (L2) is located between the first straight line (L1) and the third straight line (L3). At this time, among the two points where the first straight line (L1) and the first ellipse (E1) intersect, a first point (P1) closer to the second ellipse (E2), a second point (P2) where the first ellipse (E1) and the third ellipse (E3) intersect, a third point (P3) where the second ellipse (E2) and the third ellipse (E3) intersect, and a fourth point (P4) closer to the first ellipse (E1) among the two points where the first straight line (L1) and the second ellipse (E2) intersect can be specified.

[0061] The outline of the protrusion (12) can be formed by a first section (S1) extending from a first point (P1) along the perimeter of the first oval (E1) to a second point (P2), a second section (S2) extending from the second point (P2) along the long perimeter of the third oval (E3), that is, along the upper perimeter of the third oval (E3) as seen in FIG. 3, to a third point (P3), and a third section (S3) extending from the third point (P3) along the perimeter of the second oval (E2) to a fourth point (P4).

[0062] The first to third ovals (E1, E2, E3) can be formed with the same size and shape. In addition, the first to third ovals (E1, E2, E3) can be oriented so that the major axis is parallel to the x-axis and the minor axis is parallel to the y-axis. In other words, the first to third ovals (E1, E2, E3) can be formed to be horizontally elongated when viewed in FIG. 3. The major axis of the first to third ovals (E1, E2, E3) can be about 1.5 to about 2 times the length of the minor axis, and preferably about 1.8 times.

[0063] The angle (α) formed by the straight line connecting the center of the first or second ellipse (E1, E2) and the center of the third ellipse (E3) with respect to the second straight line (L2) may be greater than 0° and less than or equal to about 45°. Fig. 3 illustrates a case where this angle (α) is 25°. For reference, a case where the angle (α) is 15° is illustrated in Fig. 3a, and a case where it is 45° is illustrated in Fig. 3b.

[0064] The distance (D2) between the base of the above plane and the third straight line (L3) may be about 3 to about 5 times the thickness (T) of the line portion (13), and preferably about 4 times.

[0065] The position of the second straight line (L2) can be geometrically determined by the position of the third straight line (L3) and the angle (α).

[0066] The line portion (13) is formed in a shape corresponding to the outline of the protrusion (12) and is repeatedly arranged from the protrusion (12).

[0067] More specifically, the line portion (13) is formed in a shape that surrounds the long circumference of the third oval (E3), that is, the upper circumference of the third oval (E3) as viewed in FIG. 2, based on a straight line connecting the second point (P2) where the first oval (E1) and the third oval (E3) meet and the third point (P3) where the second oval (E2) and the third oval (E3) meet.

[0068] The line sections (13) may be adjacent to each other or spaced apart from each other. When the infill rate is 100%, the line sections (13) will be adjacent to each other, and when the infill rate is less than 100%, the line sections (13) will be spaced apart from each other. The infill rate may be about 60% to 100%, and when the infill rate is less than 100%, the spacing between the line sections (13) may be naturally adjusted according to the infill rate. That is, as the infill rate increases, the spacing between the line sections (13) may decrease, and as the infill rate decreases, the spacing between the line sections (13) may increase.

[0069] The minimum thickness (T) of the line portion (13) can be determined according to the resolution, nozzle size, etc. of the 3D printer used to manufacture the unit structure (10). For example, it can be determined as a value obtained by adding a specific constant to the nozzle size of the 3D printer or as a value obtained by multiplying a specific constant.

[0070] The connecting portion (14) is placed between the base portion (11) and the line portion (13), and serves to connect the line portions (13) at that location.

[0071] In this unit structure (10), the base portion (11) and the protrusion portion (12) can be formed integrally without a boundary therebetween, and in an area adjacent to the base portion (11), the line portion (13) and the connection portion (14) can be formed integrally without a boundary therebetween.

[0072] FIG. 4 shows the results of a compressive strength test on a unit structure (10) according to one embodiment of the present invention and a unit structure manufactured using a commonly used infill pattern in the past.

[0073] The unit structures used in the test were made of PETG (Polyethylene Terephtalate Glycol-modified) and formed with the same size and shape. The unit structure (10) according to one embodiment of the present invention was formed with the angle (α) of 25°. Infill patterns such as Gyroid, Triangular, and Tri-Hexagon were used as comparison targets. Since these infill patterns are well known to those skilled in the art, a detailed description of each infill pattern is omitted. In the graph, the infill pattern of the unit structure (10) according to one embodiment of the present invention is expressed as "Jigsaw" for convenience.

[0074] Referring to Fig. 4, tests were conducted while changing the infill ratio to 90%, 80%, and 70%, and it was confirmed that the compressive strength of the unit structure (10) according to one embodiment of the present invention was excellent in all cases.

[0075] Figures 5a and 5b show the results of testing the compressive strength according to the extrusion speed for a unit structure (10) according to one embodiment of the present invention and a unit structure manufactured using a conventional line pattern.

[0076] The unit structures used in the tests were fabricated from PETG and formed to the same size and shape. Furthermore, all were formed with a 100% infill ratio. The x-axis in the graph represents the final weight of samples produced by varying the extrusion speed. A lower final weight indicates a lower extrusion speed, with the rightmost sample produced at a 60% extrusion speed.

[0077] Referring to FIGS. 5a and 5b, it was found that the unit structure (10) according to one embodiment of the present invention has a higher compressive strength than the conventional line pattern even when the extrusion speed is reduced. Through this, it was found that sufficient compressive strength can be secured even when the extrusion speed is reduced for weight reduction.

[0078] The unit structure (10) described above can be formed, for example, with a width / length / height of about 5 mm to 10 mm, and can be arranged in a continuous manner in the x-axis, y-axis, and / or z-axis directions to form one assembly (100) (see, for example, FIG. 6).

[0079] Additionally, these aggregates (100) can be output as various items (see, for example, FIG. 7).

[0080]

[0081] Example 2

[0082] Figure 8 is a perspective view of a unit structure (20) for 3D printing according to another embodiment of the present invention.

[0083] Referring to FIG. 8, a unit structure (20) for 3D printing according to another embodiment of the present invention has an infill pattern defined in the xy plane, and the pattern may be extended in the z-axis direction to form a rectangular parallelepiped or a cube. For example, the unit structure (20) may be formed through a process of repeatedly stacking infill patterns along the z-axis direction.

[0084] The infill pattern of the unit structure (20) for 3D printing according to another embodiment of the present invention is inspired by the shell structure of "Cryptoglossa Muricata" belonging to the order Coleoptera, and is described in more detail with reference to FIG. 9.

[0085] Figure 9 is a front view of a unit structure (20) for 3D printing according to another embodiment of the present invention.

[0086] Referring to FIG. 9, the infill pattern includes a base portion (21), a protrusion portion (22) protruding from the base portion (21), and a plurality of line portions (23) formed in a shape corresponding to the outline of the protrusion portion (22).

[0087] The base portion (21) is a region corresponding to the lower portion when viewed in Fig. 9, and the outline of the base portion (21) can be formed by a first straight line (L1) parallel to the x-axis. That is, the base portion (21) can be formed by applying a material to the region between the bottom of a rectangular or square plane where the infill pattern is defined and the first straight line (L1).

[0088] The thickness of the base portion (21), i.e., the distance (D1) between the bottom of the plane and the first straight line (L1), may be about 1.5 to about 2.5 times the thickness (T) of the line portion (23) described later, and preferably about 2 times.

[0089] The protrusion (22) protrudes from the base (21), and the outline of the protrusion (22) can be formed by three isosceles triangles.

[0090] More specifically, referring to FIG. 10, two isosceles triangles (T1, T2) having bases on a first straight line (L1) and touching each other (hereinafter referred to as “first isosceles triangle (T1)” and “second isosceles triangle (T2)”) and a third isosceles triangle (T3) whose lower vertices coincide with the upper vertices of the first isosceles triangle (T1) and the second isosceles triangle (T2) can be defined. At this time, a first point (P1) located at the center of the base of the first isosceles triangle (T1), a second point (P2) located at the center of the hypotenuse closer to the second isosceles triangle (T2) among the two hypotenuses of the first isosceles triangle (T1), a third point (P3) corresponding to the upper vertex of the first isosceles triangle (T1), a fourth point (P4) corresponding to the upper vertex of the third isosceles triangle (T3), a fifth point (P5) corresponding to the upper vertex of the second isosceles triangle (T2), a sixth point (P6) located at the center of the hypotenuse closer to the first isosceles triangle (T1) among the two hypotenuses of the second isosceles triangle (T2), and a seventh point (P7) located at the center of the base of the second isosceles triangle (T2) can be specified.

[0091] The outline of the protrusion (22) can be formed by a first section (S1) extending from a first point (P1) to a third point (P3) via a second point (P2), a second section (S2) extending from the third point (P3) to a fourth point (P4), a third section (S3) extending from the fourth point (P4) to a fifth point (P5), and a fourth section (S4) extending from the fifth point (P5) to a seventh point (P7) via a sixth point (P6).

[0092] Here, the first section (S1) can extend along the perimeter of an ellipse whose major and minor axes are parallel to the x-axis or y-axis, passing through the first to third points (P1, P2, P3). Similarly, the fourth section (S4) can extend along the perimeter of an ellipse whose major and minor axes are parallel to the x-axis or y-axis, passing through the fifth to seventh points (P5, P6, P7).

[0093] In addition, a curvature may be applied in the transition between the first section (S1) and the second section (S2) according to a pre-programmed setting so that a smooth transition can be achieved. For example, spline interpolation may be applied to the first and second sections (S1, S2) based on the first to fourth points (P1, P2, P3, P4). As a result of applying the spline interpolation in this way, the first section (S1) may no longer exactly match the circumference of the ellipse (see comparison of FIGS. 9 and 10). In addition, the second section (S2) may no longer exactly match the hypotenuse of the third isosceles triangle (T3) (see comparison of FIGS. 9 and 10). Similarly, a curvature may be applied in the transition between the third section (S3) and the fourth section (S4) according to a pre-programmed setting so that a smooth transition can be achieved. For example, spline interpolation may be applied to the third and fourth sections (S3, S4) based on the fourth to seventh points (P4, P5, P6, P7). As a result of applying spline interpolation in this way, the third section (S3) may no longer exactly coincide with the hypotenuse of the third isosceles triangle (T3) (see comparison of FIGS. 9 and 10). In addition, the fourth section (S4) may no longer exactly coincide with the perimeter of the ellipse (see comparison of FIGS. 9 and 10).

[0094] The distance between the base of the above plane and the base of the third isosceles triangle (T3) may be about 3 to about 5 times the thickness (T) of the line portion (23), and preferably about 4 times.

[0095] The distance between the base of the above plane and the center of gravity of the third isosceles triangle (T3) may be about 3.5 to about 6.5 times the thickness of the line portion (23), and preferably about 5 times.

[0096] The line portion (23) is formed in a shape corresponding to the outline of the protrusion (22) and is repeatedly arranged from the protrusion (22).

[0097] More specifically, the line section (23) may include a section formed in a shape corresponding to the first and fourth sections (S1, S4) of the protrusion (22) below the straight line connecting the upper vertex of the first isosceles triangle (T1) and the upper vertex of the second isosceles triangle (T2), and a section formed in a shape corresponding to the second and third sections (S2, S3) of the protrusion (22) above the straight line.

[0098] The line parts (23) may be adjacent to each other or may be spaced apart from each other. When the infill ratio is 100%, the line parts (23) will be adjacent to each other, and when the infill ratio is less than 100%, the line parts (23) will be spaced apart from each other. The infill ratio may be about 60% to 100%, and when the infill ratio is less than 100%, the spacing between the line parts (23) may be naturally adjusted according to the infill ratio. That is, as the infill ratio increases, the spacing between the line parts (23) may decrease, and as the infill ratio decreases, the spacing between the line parts (23) may increase.

[0099] The minimum thickness (T) of the line portion (23) can be determined according to the resolution, nozzle size, etc. of the 3D printer used to manufacture the unit structure (20). For example, it can be determined as a value obtained by adding a specific constant to the nozzle size of the 3D printer or as a value obtained by multiplying a specific constant.

[0100] The unit structure (20) described above can be formed, for example, with a width / length / height of about 5 mm to 10 mm, and can be arranged in a continuous manner in the x-axis, y-axis, and / or z-axis directions to form one assembly (200) (see, for example, FIG. 11).

[0101] Additionally, these aggregates (200) can be output as various items.

[0102]

[0103] Example 3

[0104] FIG. 12 is a perspective view of a unit structure (10) for 3D printing according to another embodiment of the present invention.

[0105] Referring to FIG. 12, a unit structure (30) for 3D printing according to another embodiment of the present invention has an infill pattern defined in the xy plane, and the pattern may be extended in the z-axis direction to form a rectangular parallelepiped or a regular hexahedron. For example, the unit structure (30) may be formed through a process of repeatedly stacking infill patterns along the z-axis direction.

[0106] The infill pattern of the unit structure (30) for 3D printing according to another embodiment of the present invention is inspired by the shell structure of "Trypoxylus Dichotomus" belonging to the order Coleoptera, and may include a plurality of line portions (31).

[0107] The line segments (31) can be formed in a form that is segmented by a function graph having at least two inflection points, for example, any 4th or 5th order function graph and a repeating pattern generated based on a change in the x-intercept and a parallel movement along the y-axis for the function graph.

[0108] For example, the line segments (31) can be formed in a form divided by the function graphs below.

[0109] y n=(ax-αn)(bx-β)(cx-γ)(dx-δ)(ex-ε)+Cn; sweet y n is a fourth or fifth order function; a, b, c, d, α, C are non-zero real numbers; e, β, γ, δ, ε are real numbers; n is an integer

[0110] More specifically, for example, the line sections (31) can be formed in a form divided by the function graphs below.

[0111] y n =(0.6x-(0.5-0.3n)(0.6x-1)(0.6x-1.5)(0.6x-2.5)(0.6x-(3.5-0.3n))+0.8n, where n is an integer greater than or equal to 0;

[0112] y n =(0.6x-(0.5-0.3n)(0.6x-1)(0.6x-1.5)(0.6x-(2.5+0.1n))(0.6x-(3.5-0.3n))+0.8n, where n is an integer less than 0

[0113] For example, Line Budle (31)

[0114] ① y -2 =(0.6x-1.1)(0.6x-1)(0.6x-1.5)(0.6x-2.3)(0.6x-4.1)-1.6

[0115] ② y -1 =(0.6x-0.8)(0.6x-1)(0.6x-1.5)(0.6x-2.4)(0.6x-3.8)-0.8

[0116] ③ y0=(0.6x-0.5)(0.6x-1)(0.6x-1.5)(0.6x-2.5)(0.6x-3.5)

[0117] ④ y1=(0.6x-0.2)(0.6x-1)(0.6x-1.5)(0.6x-2.5)(0.6x-3.2)+0.8

[0118] ⑤ y2=(0.6x+0.1)(0.6x-1)(0.6x-1.5)(0.6x-2.5)(0.6x-2.9)+1.6

[0119] It can be formed in a form partitioned by function graphs such as the following.

[0120] Or, for example, the line segments (31) can be formed in a form segmented by the function graph below.

[0121] y n =0.05((3x-(1-0.9n))(x-3)(x(2 + 0.3n))(x-4)(x(5.8-0.3n))+0.8n, where n is an integer

[0122] For example, Line Budle (31)

[0123] ① y -2 =0.05((3x-2.8)(x-3)(x-1.4)(x-4)(x-6.4))-1.6

[0124] ② y -1 =0.05((3x-1.9)(x-3)(x-1.7)(x-4)(x-6.1))-0.8

[0125] ③ y0=0.05((3x-1.0)(x-3)(x-2)(x-4)(x-5.8))

[0126] ④ y1=0.05((3x-0.1)(x-3)(x-2.3)(x-4)(x-5.5))+0.8

[0127] ⑤ y2=0.05((3x+0.8)(x-3)(x-2.6)(x-4)(x-5.2))+1.6

[0128] It can be formed in a form partitioned by function graphs such as the following.

[0129] The line parts (33) may be adjacent to each other or may be spaced apart from each other. When the infill ratio is 100%, the line parts (33) will be adjacent to each other, and when the infill ratio is less than 100%, the line parts (33) will be spaced apart from each other. The infill ratio may be about 60% to 100%, and when the infill ratio is less than 100%, the spacing between the line parts (33) may be naturally adjusted according to the infill ratio. That is, as the infill ratio increases, the spacing between the line parts (33) may decrease, and as the infill ratio decreases, the spacing between the line parts (33) may increase.

[0130] The minimum thickness of the line portion (33) can be determined according to the resolution, nozzle size, etc. of the 3D printer used to manufacture the unit structure (30). For example, it can be determined as a value obtained by adding a specific constant to the nozzle size of the 3D printer or as a value obtained by multiplying a specific constant.

[0131] The unit structure (30) described above can be formed, for example, with a width / length / height of about 5 mm to 10 mm, and can be arranged in a continuous manner in the x-axis, y-axis, and / or z-axis directions to form one assembly (300) (see, for example, FIG. 13).

[0132] Additionally, these aggregates (300) can be output as various items.

[0133]

[0134] The above description is merely one of the various embodiments of the present invention. The technical concept of the present invention is not limited to the above embodiments, but encompasses all modifications that can be easily made by a person of ordinary skill in the art, as set forth in the claims.

Claims

1. As a unit structure having an infill pattern, The above infill pattern is, bass section; A protrusion protruding from the above base portion; A plurality of line portions formed in a shape corresponding to the outline of the above protrusion; and A connecting portion disposed between the base portion and the plurality of line portions, and connecting some of the plurality of line portions, Unit structure.

2. In paragraph 1, The above infill pattern is defined in a rectangular or square plane, Unit structure.

3. In paragraph 2, The outline of the above base portion is formed by a first straight line parallel to the base of the above plane, Unit structure.

4. In paragraph 3, The outline of the above protrusion is, When a first ellipse and a second ellipse that are spaced apart from each other and have centers on a second straight line parallel to the first straight line and a third ellipse that is tangent to the first ellipse and the second ellipse and have centers on a third straight line parallel to the second straight line are defined, A first section extending along the circumference of the first oval from a first point closer to the second oval among the two points where the first straight line and the first oval intersect to a second point where the first oval and the third oval touch; A second section extending along the circumference of the third oval from the second point to a third point where the second oval and the third oval meet; and It is formed by a third section extending along the circumference of the second oval from the third point to a fourth point closer to the first oval among the two points where the first straight line and the second oval intersect, The second straight line is located between the first straight line and the third straight line. Unit structure.

5. In paragraph 4, The above line portion is formed in a shape corresponding to the circumference of the third oval based on the straight line connecting the second point and the third point. Unit structure.

6. In paragraph 4, The distance between the base of the above plane and the first straight line is 1.5 to 2.5 times the thickness of the line portion. Unit structure.

7. In paragraph 4, The distance between the base of the above plane and the third straight line is 3 to 5 times the thickness of the line portion. Unit structure.

8. In paragraph 4, The angle formed by the straight line connecting the center of the first or second ellipse and the center of the third ellipse with respect to the second straight line is greater than 0° and less than or equal to 45°. Unit structure.

9. In paragraph 1, The infill ratio is 60% to 100%, Unit structure.

10. An article manufactured by 3D printing using the unit structure according to Article 1.

11. As a unit structure having an infill pattern, The above infill pattern is, bass section; a protrusion protruding from the base portion; and Including a plurality of line portions formed in a shape corresponding to the outline of the above protrusion, Unit structure.

12. In paragraph 11, The above infill pattern is defined in a rectangular or square plane, Unit structure.

13. In paragraph 12, The outline of the above base portion is formed by a first straight line parallel to the base of the above plane, Unit structure.

14. In paragraph 13, The outline of the above protrusion is, When a first isosceles triangle and a second isosceles triangle having bases on the first straight line and touching each other and a third isosceles triangle whose lower vertices coincide with the upper vertices of the first isosceles triangle and the upper vertices of the second isosceles triangle are defined, A first section extending from a first point located at the center of the base of the first isosceles triangle to a second point located at the center of the hypotenuse closest to the second isosceles triangle among the two hypotenuses of the first isosceles triangle to a third point corresponding to the upper vertex of the first isosceles triangle; A second section extending from the third point to the fourth point corresponding to the upper vertex of the third isosceles triangle; A third section extending from the fourth point to the fifth point corresponding to the upper vertex of the second isosceles triangle; A fourth section formed by a sixth point located at the center of the hypotenuse of the second isosceles triangle closer to the first isosceles triangle from the fifth point to the seventh point located at the center of the base of the second isosceles triangle. Unit structure.

15. In paragraph 14, The first section extends along the circumference of an ellipse having its center on a straight line connecting the first point and the third point while passing through the first to third points, The above fourth section is an elliptical shape that passes through the fifth to seventh points and has its center on a straight line connecting the fifth and seventh points. Unit structure.

16. In paragraph 15, Spline interpolation is applied based on the first to fourth points for the first and second sections, For the third and fourth sections, spline interpolation is applied based on the fourth to seventh points. Unit structure.

17. In paragraph 14, The distance between the base of the above plane and the base of the third isosceles triangle is 3 to 5 times the thickness of the line portion. Unit structure.

18. In paragraph 14, The distance between the base of the above plane and the center of gravity of the third isosceles triangle is 3.5 to 6.5 times the thickness of the line portion. Unit structure.

19. In paragraph 11, The infill ratio is 60% to 100%, Unit structure.

20. An article manufactured by 3D printing using the unit structure according to Article 11.

21. As a unit structure for 3D printing with an infill pattern, The above infill pattern includes a plurality of line portions, The above plurality of line sections are formed in a form segmented by a function graph having at least two inflection points and a repeating pattern generated based on a change in the x-intercept and a parallel movement of the y-axis for the function graph. Unit structure.

22. In paragraph 21, The above multiple line sections are formed in a form divided by the function graphs below. Unit structure. y n =(ax-αn)(bx-β)(cx-γ)(dx-δ)(ex-ε)+Cn; sweet y n is a fourth or fifth order function; a, b, c, d, α, C are non-zero real numbers; e, β, γ, δ, ε are real numbers; n is an integer 23. In paragraph 21, The above multiple line sections are formed in a form divided by the function graphs below. Unit structure. y n =(0.6x-(0.5-0.3n)(0.6x-1)(0.6x-1.5)(0.6x-2.5)(0.6x-(3.5-0.3n))+0.8n, where n is an integer greater than or equal to 0; y n =(0.6x-(0.5-0.3n)(0.6x-1)(0.6x-1.5)(0.6x-(2.5+0.1n))(0.6x-(3.5-0.3n))+0.8n, where n is an integer less than 0 24. In paragraph 21, The above multiple line sections are formed in a form divided by the function graphs below. Unit structure. y n =0.05((3x-(1-0.9n))(x-3)(x(2 + 0.3n))(x-4)(x(5.8-0.3n))+0.8n, where n is an integer 25. In paragraph 21, The infill ratio is 60% to 100%, Unit structure.

26. An article manufactured by 3D printing using the unit structure according to Article 21.

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