KR20190036798A - Method for calculating metal powder supply rate of 3d printer - Google Patents

Abstract

The present invention relates to a method for calculating a supply volume of metal powder for a 3D printer, which is for efficiently supplying metal powder to the 3D printer. More specifically, the present invention relates to a method capable of efficiently re-supplying metal powder to a part, to which a laser is irradiated, after first supplying metal powder. To this end, according to the present invention, the method comprises: a first step of checking a layer, where the metal powder is melted by the laser irradiated along an outputted path; a second step of checking a coordinate value of the layer; a third step of, when there exists a coordinate value in the second step, using the starting point and the ending point of the coordinate value and calculating an output distance; a fourth step of using the calculated output distance and diameter of the laser to calculate an output cross-sectional area; a fifth step of preparing a list of the calculated output cross-sectional area; a sixth step of checking the next coordinate value of the coordinate value checked by the second step; a seventh step of, when there is no coordinate value checked by the sixth step, adding the output cross-sectional area prepared as the list by the fifth step and calculating the total cross-sectional area; an eighth step of using the total cross-sectional area and thickness of the laser and obtaining the output volume; and a ninth step of using the calculated output volume and calculating a supply volume of the metal powder. According to the present invention, the method is capable of predicting the volume of the metal powder melted and indented by the irradiated laser and supplying a more precise volume of the metal powder necessary for layer lamination.

Description

[0001] METHOD FOR CALCULATING METAL POWDER SUPPLY RATE OF 3D PRINTER [0002]

The present invention relates to a supply amount calculation method for efficiently supplying a metal powder amount to be supplied to a 3D printer, and more particularly, to a calculation method capable of efficiently supplying metal powder re-supplied to a laser irradiation site after metal powder supply will be.

Three-dimensional (3D) printing is a technique for producing three-dimensional objects by stacking successive layers of materials, and is widely used in industrial fields for producing prototypes through product drawings. Three-dimensional printers stack up various materials such as plastic, metal, and ink to produce three-dimensional objects.

In the method of manufacturing a product using a three-dimensional printer, the object to be made first is scanned using a scanner and stored as image data on a computer. Next, after analyzing the stored data as more than 10,000 samples horizontally, the thin film (layer) is stacked one by one to complete the object from the bottom to the top. More specifically, in the process of stacking the layers using a metal material, when the metal powder is supplied by the thickness of the layer stack, the metal powder is irradiated with a laser and laminated. This is called the SLM method.

In general, since the SLM method irradiates the metal powder with a laser and melts only the irradiated portion of the laser, the metal powder needs to be supplied by the output size. However, the metal powder is expensive, is difficult to be recycled, and if it is supplied with a large amount of metal powder, it is wasted, and there is a problem that it is not enough to output the metal powder to the maximum output size.

Korean Patent No. 10-1700669 {Manufacturing Method of Three-Dimensional Circuit Structure, Apparatus for Producing Three-Dimensional Circuit Structure and Three-Dimensional Circuit Structure Manufactured by the Method}

Disclosure of the Invention The present invention has been conceived to solve the problems of the prior art as described above, and it is an object of the present invention to provide a metal powder supply amount calculation method of a 3D printer capable of efficiently layering a layer of a 3D printer, It has its purpose.

An object of the present invention is to provide a method of calculating the amount of metal powder to be supplied to a 3D printer which can efficiently supply metal powder even if the shape of each layer is changed.

According to another aspect of the present invention, there is provided a method for calculating a metal powder supply amount of a 3D printer, comprising: a first step of identifying a melted layer of the metal powder by irradiated laser according to an output path; A second step of confirming a coordinate value of the layer; A third step of calculating an output distance using a starting point and an ending point of the coordinate value when the coordinate value exists in the second step; A fourth step of calculating an output cross-sectional area using the calculated output distance and the diameter of the laser; A fifth step of listing the calculated output cross-sectional area; A sixth step of confirming a next coordinate value of the coordinate value identified in the second step; A seventh step of calculating a total cross-sectional area by summing the output cross-sectional areas listed in the fifth step when there is no coordinate value to be confirmed of the layer in the sixth step; An eighth step of obtaining an output volume using the total cross-sectional area and the thickness of the layer; And calculating a supply amount of the metal powder using the calculated output volume, wherein the amount of the metal powder melted and predicted by the laser irradiation is predicted so that the metal powder necessary for the next layer deposition And can be supplied in an exact amount.

According to an embodiment of the present invention, the present invention can provide a method for calculating the metal powder supply amount of a 3D printer for additionally effective metal powder supply, due to the melting according to various irradiation ranges after laser irradiation.

In addition, the present invention can provide a metal powder of a 3D printer that can efficiently supply metal powder even if output to be produced is different.

Further, the present invention can save the metal powder to be wasted by calculating the most suitable metal powder feed amount, and also it is possible to supply a fixed amount of powder in accordance with various output paths or hatching intervals.

In addition, the amount of metal powder required for the next layer stacking can be supplied in a more accurate amount by predicting the amount by which the metal powder is melted and melted by the laser irradiation.

1 is a control block diagram in which a 3D printer is controlled in a method of calculating a metal powder feed amount of a 3D printer according to the present invention.
2 is a flowchart showing a method of calculating the metal powder feed amount of the 3D printer according to the present invention.
3 is an embodiment of a method of calculating the metal powder feed amount of the 3D printer according to the present invention.

The above and other objects, features and advantages of the present invention will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings.

The present invention relates to a supply amount calculation method for efficiently supplying a metal powder amount to be supplied to a 3D printer, and more particularly to a calculation method capable of efficiently supplying a metal powder additionally supplied to a laser irradiation site after supply of a metal powder will be.

That is, the 3D printer includes a control unit 200 that receives shape data of a product to be printed and controls the input of metal powder, whether or not the laser is irradiated, and a point based on the shape data of the input product And the method of calculating the metal powder supply amount of the 3D printer to be described below may be performed by the control unit.

More specifically, as shown in the control block diagram of FIG. 1, when the coordinate value is input by the sensor unit 100 for identifying a layer melted by the laser, And controls the coordinate values to transmit data to the metal powder feeder 300.

The present invention will be described in more detail below with reference to a flowchart showing a method of calculating the rapid powder feed rate of the 3D printer of FIG.

First, in a first step S10, a laser is irradiated according to a path through which the metal powder is output to melt the metal powder to generate a layer. More specifically, the laser-irradiated metal powder is melted at an increased temperature up to the melting point, and an additional powder amount is required due to the heat accumulation by the output portion. The portion melted or melted by the laser is designated as a layer.

It is preferable that the above-mentioned layer creation is performed by creating portions of the melted portions having the same thickness as the same layer, and creating different layers when the thicknesses are different.

Also, a layer melted by the laser is identified. More specifically, the layer is melted by the laser, and the volume-reduced layer is identified by the sensor unit 100 provided in the laser.

Next, the second step S20 checks the coordinate values of the layer. More specifically, the coordinate value of the layer is confirmed by the sensor unit 100 provided in the laser, and the data is transmitted to the controller 200, and is confirmed as two-dimensional values of the X axis and the Y axis .

The coordinate value is a pair of the starting point and the ending point, and it is determined whether or not the pair of coordinate values is present. If there is a pair of coordinate values, the process proceeds to the next step S30, If there is no previous coordinate value, the seventh step S70 to be described below is performed.

Next, in a third step S30, when the coordinate value exists in the second step S20, the control unit 200 calculates the output distance using the starting point and the ending point of the coordinate value.

If the starting point of the coordinate value identified in the third step S30 is P1 and the ending point is P2, the output distance d is calculated by the following equation (1).

Next, in a fourth step S40, the output cross-sectional area S is calculated using the calculated output distance d and the diameter D of the laser.

The output cross-sectional area S is calculated by the following equation (2), which is obtained by multiplying the output distance d calculated in the third step S30 by the laser diameter D:

Next, in the fifth step S50, the control section 200 lists the calculated output cross-sectional area S. More specifically, after storing the listed output cross-sectional area S, it is possible to calculate the sum of the stored output cross-sectional areas in a seventh step S70.

Next, in the eighth step S80, the next coordinate value of the coordinate value confirmed in the second step S20 is confirmed. If there is a coordinate value confirmed in the sixth step S60, it is preferable to carry out the step of feedback control from the third step S30 as shown in FIG.

If there is no coordinate value confirmed in the sixth step S60, the following seventh step S70 is performed as shown in FIG.

Next, in the seventh step S70, if there is no coordinate value confirmed in the sixth step S60, the output cross-sectional areas S1, S2, S3, ... listed in the fifth step S50 ) To calculate the total cross-sectional area (A).

The total cross-sectional area (A) is calculated by the following equation (3).

Next, in an eighth step S80, the output volume is obtained by using the total sectional area A and the thickness H of the layer.

Since the total cross-sectional area A is a value calculated in the fourth step S40 and the layer height H is designated as the same layer when the same thickness is provided in the first step S10, H) can be a constant value.

Next, in operation S90, a metal powder supply amount is calculated using the calculated output volume. The amount of metal powder to be supplied is calculated by adding the amount of metal powder required for the next layer stacking of a layer already stacked on the output volume V calculated in the eighth step S80 as shown in the following Equation 5 desirable. That is, if the metal powder amount of the next layer to be laminated is denoted by Un, and the additional required output volume, which is melted and calculated in the eighth step S80, is Vn, the metal powder feed amount Yn required for the n layer is Can be expressed as shown in Equation 5 below.

Hereinafter, a method for calculating the metal powder supply amount of the 3D printer according to the present invention will be described with reference to the embodiments.

As shown in FIG. 3, the layer melted by the laser is diamond-shaped, the size of the stacked output is 10 mm x 10 mm x 10 mm, the diameter D of the laser is 0.05 mm, the hatching distance is 1 mm, It is assumed that the hatching off is 0.05 mm and the layer height (H) is 0.03 mm.

The X and Y values of the starting point and the ending point of the diamond-shaped output shown in FIG. 3 are shown in Table 1, and the output distance d and the output cross-sectional area S according to Equation (2) Are shown in Table 1 below. The starting and ending points are indicated by dots in Fig.

X value Y value Output distance ^*
(d, mm) Output cross section ^*
(S, mm 2) S1 P ₁₁ 58.9999 64.0013 2.00 0.100 P ₁₂ 58.9999 66.0003 S2 P ₂₁ 59.9999 67.0003 4.00 0.200 P ₂₂ 59.9999 63.0013 S3 P ₃₁ 60.9999 62.0013 6.00 0.300 P ₃₂ 60.9999 68.0003 S4 P ₄₁ 61.9999 69.0003 8.00 0.400 P ₄₂ 61.9999 61.0013 S5 P ₅₁ 62.9999 60.0013 10.00 0.500 P ₅₂ 62.9999 70.0003 S6 P ₆₁ 63.9999 71,0003 12.00 0.600 P ₆₂ 63.9999 59.0013 S7 P ₇₁ 64.9999 58.0013 14.00 0.700 P ₇₂ 64.9999 72,0003 S8 P ₈₁ 65.9999 71.002 12.00 0.600 P ₈₂ 65.9999 58.9996 S9 P ₉₁ 66.9999 59.9996 10.00 0.500 P ₉₂ 66.9999 70.002 S10 P ₁₀₁ 67.9999 69.002 8.00 0.400 P ₁₀₂ 67.9999 60.9996 S11 P ₁₁₁ 68.9999 61.9996 6.00 0.300 P ₁₁₂ 68.9999 68.002 S12 P ₁₂₁ 69.9999 67.002 4.00 0.200 P ₁₂₂ 69.9999 62.9996 S13 P ₁₃₁ 70.9999 63.9996 2.00 0.100 P ₁₃₂ 70.9999 66.002 S14 P ₁₄₁ 57.9299 65.001 7.07 0.354 P ₁₄₂ 65.001 72.072 S15 P ₁₅₁ 65.001 72.072 7.07 0.354 P ₁₅₂ 72.072 65.001 S16 P ₁₆₁ 72.072 65.001 7.07 0.354 P ₁₆₂ 65.001 57.9299 S17 P ₁₇₁ 65.001 57.9299 7.07 0.354 P ₁₇₂ 57.9299 65.001

* The output distance is represented by two decimal places, and the output cross section is represented by three decimal places.

For example, the first output distance d1 may be,

이고,

ego,

The first output cross-sectional area (S1)

을 산출할 수 있다.

Can be calculated.

The sum of the first output cross-sectional area S1 to the thirteenth output cross-sectional area S13 shown in the blue space is the cross-sectional area inside the diamond-shaped output of FIG. 3, and the fourteenth output cross- The sum of the output cross-sectional areas S17 is a cross-sectional area calculated when the metal powder needs to be additionally supplied to the end of the diamond shape. The calculation of the fourteenth output sectional area S14 to the seventeenth output sectional area S17 indicated by the red color space can be selectively performed by the user.

The total cross-sectional area (A) is obtained by summing the output cross-sectional areas (S) obtained in the above Table 1, and the following values can be confirmed.

Next, the output volume V is obtained by multiplying the total sectional area A by the thickness H of the layer.

Next, the thickness of the stacked layers is 0.03 mm, the calculated output volume V is V3 when the layer is melted in the second layer, and the metal powder amount U3 to be supplied from the third layer is added The total metal powder feed amount (Y3) is calculated as follows.

Therefore, it is possible to supply the powder of the rapid powder to the powder room of the 3D printer by 3.18945 (㎣) more.

According to an embodiment of the present invention, the present invention can provide a metal powder supply amount calculation method of a 3D printer capable of efficiently supplying metal powder re-supplied after laser irradiation according to an amount to be melted.

The present invention can provide a metal powder of a 3D printer which can efficiently supply metal powder even if the output to be produced is different.

The present invention can calculate the most suitable metal powder feed rate, thus saving wasted metal powder and lowering the cost of produced output.

As described above, it is to be understood that the technical structure of the present invention can be embodied in other specific forms without departing from the spirit and essential characteristics of the present invention.

Therefore, it should be understood that the above-described embodiments are to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than the foregoing description, All changes or modifications that come within the scope of the equivalent concept are to be construed as being included within the scope of the present invention.

100. Layer identification sensor unit
200. Control unit
300. Metal Powder Supply Section
S10. A first step of identifying a layer in which the metal powder is melted by the irradiated laser according to the output path;
S20. A second step of confirming a coordinate value of the layer;
S30. A third step of calculating an output distance using a starting point and an ending point of the coordinate value when the coordinate value exists in the second step;
S40. A fourth step of calculating an output cross-sectional area using the calculated output distance and the diameter of the laser;
S50. A fifth step of listing the calculated output cross-sectional area;
S60. A sixth step of confirming a next coordinate value of the coordinate value identified in the second step;
S70. A seventh step of calculating a total cross-sectional area by summing up the output cross-sectional areas listed in the fifth step if there is no coordinate value to be checked of the layer in the sixth step;
S80. An eighth step of obtaining an output volume using the total cross-sectional area and the thickness of the layer;
S90. A ninth step of calculating a metal powder supply amount using the calculated output volume;

Claims (5)

In selective laser melting (SLM)
A first step of identifying a layer in which the metal powder is melted by the irradiated laser according to the output path;
A second step of confirming a coordinate value of the layer;
A third step of calculating an output distance using a starting point and an ending point of the coordinate value when the coordinate value exists in the second step;
A fourth step of calculating an output cross-sectional area using the calculated output distance and the diameter of the laser;
A fifth step of listing the calculated output cross-sectional area;
A sixth step of confirming a next coordinate value of the coordinate value identified in the second step;
A seventh step of calculating a total cross-sectional area by summing the output cross-sectional areas listed in the fifth step when there is no coordinate value identified in the sixth step;
An eighth step of obtaining an output volume using the total cross-sectional area and the thickness of the layer;
And a ninth step of calculating a metal powder supply amount using the calculated output volume,
Wherein the amount of the metal powder necessary for the next layer stacking can be supplied in an accurate amount by predicting the amount by which the metal powder is melted and recessed by the laser irradiation, The method according to claim 1,
Wherein the output distance d calculated using the starting point and the ending point of the coordinate value in the fourth step is calculated by the following equation 1:
[Equation 1]
When the starting point is P1 and the ending point is P2,
Assuming that each coordinate is a starting point P1 (X1, Y1) and an ending point P2 (X2, Y2)

The method according to claim 1,
Wherein the output cross sectional area S of the fifth step is calculated by the following equation (2): < EMI ID = 2.0 >
&Quot; (2) "

The method according to claim 1,
Wherein the output volume of the ninth step is calculated by the following equation (4)
&Quot; (4) "

The method according to claim 1,
In the tenth step,
And calculating the supply amount of metal powder in the 3D printer
&Quot; (5) "

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