TWI637840B - Printing method of solid printer and system thereof - Google Patents

Abstract

The invention relates to a printing method and system for a three-dimensional printing machine, wherein the method comprises: slicing a three-dimensional printing object model to obtain a slice of each layer of a three-dimensional printing object model; comparing data difference between two adjacent slices Identifying the closed horizontal plane at the top of each wall of the three-dimensional printed object model, recording the closed horizontal plane of each slice; determining the wall thickness position in the closed horizontal plane that needs to be repaired as the wall thickness position to be treated; and the wall to be treated in the closed horizontal plane The thick position is deformed to reach a preset wall thickness, and a slice of each layer of the three-dimensional printed object model is obtained. The solution of the present invention can improve the molding quality of the outer horizontal surface of the three-dimensional print.

Description

Printing method and system for three-dimensional printing machine

The invention relates to a printing technique, in particular to a printing method and system for a three-dimensional printing machine.

Three-dimensional printing is a form of additive manufacturing technology in which a three-dimensional printing article is created by a continuous physical layer of a three-dimensional printing machine. Compared with other additive manufacturing technologies, the three-dimensional printing machine has the advantages of high speed, low price, high ease of use and the like. The three-dimensional printing machine is a kind of equipment that can print real three-dimensional objects. It is functionally the same as the laser forming technology. It uses layered processing and superposition forming, which is to create three-dimensional printing objects by layer-by-layer material addition, and traditional material removal processing. The technology is completely different. The so-called three-dimensional printing machine refers to the technical principle of the ink jet printer, because the process of layering processing is very similar to the working principle of the ink jet printer.

At present, when the three-dimensional printing machine prints the three-dimensional printing object, firstly, the model data information of the three-dimensional printing object is obtained; and then, the slice data is performed according to the model data information of the three-dimensional printing object. Then, the slices of each layer can be printed to obtain a three-dimensional printed object.

It is well known that the high (thickness) accuracy of the print layer is one of the most important indicators of the quality of a three-dimensional printer. It determines the fineness of the print and directly reflects the model to the object (ie, the stand The reproduction quality of the body print). However, in the actual printing, another print quality indicator "printing line width" is often overlooked, which also plays a crucial role in the quality of printing.

The inventor found in the actual three-dimensional printing experience that there are large line cracks in some horizontal quality of the printed physical objects, that is, the horizontal plane cannot be completely closed, which is caused by the mismatch between the printing line width and the model characteristics. problem. To solve this problem, the usual practice is to change the printer's layer height and print speed to change the print line width. However, because the printing layer height is changed, the printing quality will be affected, and the printing line width is matched with the printing head diameter to better control the printing line width stability. If the printing line width and the printing head diameter are not Matching will make it difficult to control the print line width stability; and adjusting the print line width will also reduce print quality.

The invention provides a printing method for a three-dimensional printing machine, which can improve the forming quality of the outer horizontal surface of the three-dimensional printing material.

The invention provides a printing system for a three-dimensional printing machine, which can improve the forming quality of the outer horizontal surface of the three-dimensional printing material.

A printing method for a three-dimensional printing machine, the method comprising: slicing a three-dimensional printing object model to obtain a slice of each layer of a three-dimensional printing object model; comparing data difference between two adjacent slices to identify three-dimensional printing of each layer The closed horizontal plane at the top of the object model wall, recording the closed horizontal plane of each slice; determining the wall thickness position in the closed horizontal plane that needs to be repaired, as the wall thickness position to be treated; The position of the wall thickness to be treated in the closed horizontal plane is deformed to reach a preset wall thickness, and the sliced three-dimensional printed object model of each layer is obtained.

A printing system for a three-dimensional printing machine, the system comprising a model layering module, a closed water level analysis module and a model repair processing module; the model layering module, the three-dimensional printing object model is sliced to obtain layers The slice of the three-dimensional print object model; the closed water level analysis module compares the data difference between two adjacent slices, identifies the closed horizontal plane at the top of the wall of each layer of the three-dimensional printed object model, records the closed horizontal plane of each slice; The wall thickness position in the horizontal plane that needs to be repaired is used as the wall thickness position to be treated; the model repair processing module deforms the position of the wall thickness to be treated in the closed horizontal plane to reach a preset wall thickness, and is repaired. A slice of the three-dimensional print object model of each layer.

As can be seen from the above solution, in the present invention, the three-dimensional print object model is sliced to obtain a slice of each layer of the three-dimensional print object model; the difference between the two adjacent slices is compared, and the three-dimensional print object model wall is identified. The closed horizontal plane at the top records the closed horizontal plane of each slice; determines the wall thickness position in the closed horizontal plane that needs to be repaired as the wall thickness position to be treated; deforms the wall thickness to be treated in the closed horizontal plane to reach the preset wall Thick, the patch of each layer of the three-dimensional printed object model is obtained. The invention does not modify the characteristic parameters of the printing machine, but adopts the method of detecting and fine-tuning the model to self-adjust the printing, and improves the problem that the line outside the horizontal surface of the printing material has a line crack (the water level cannot be completely closed), thereby improving the three-dimensionality. The molding quality of the outer horizontal surface of the print.

101~104‧‧‧Steps

201~206‧‧‧Steps

1‧‧‧ slice

2‧‧‧ slice

1 is a schematic flow chart of a printing method of a three-dimensional printing machine of the present invention; FIG. 2 is a flow chart of a printing method of a three-dimensional printing machine of the present invention; FIG. 4 is a schematic view showing a schematic diagram of a deformation process of a contour in a closed horizontal plane according to the present invention; and FIG. 5 is a schematic structural view of a printing system of a three-dimensional printer according to the present invention.

In order to make the objects, technical solutions and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the embodiments and drawings.

The invention does not modify the characteristic parameters of the printing machine, but uses the method of detecting and fine-tuning the model to adjust the printing and improve the problem of line cracks in the outer surface of the printing material. 1 is a schematic flow chart of a printing method of a three-dimensional printing machine of the present invention, which comprises the following steps:

In step 101, the three-dimensional print object model is sliced to obtain a slice of each layer of the three-dimensional print object model.

The three-dimensional print object model is sliced by the prior art, and the slice thickness can be set by itself, for example, once every 0.2 mm.

In step 102, the data difference is compared between two adjacent slices, and the closed horizontal plane at the top of the wall of each layer of the three-dimensional printed object model is identified, and the closed horizontal plane of each slice is recorded.

Each layer of the three-dimensional printed object model includes a wall and a closed horizontal plane at the top of the wall. The closed part of the closed horizontal plane and the wall is required to be sprayed when printing. part. By comparing the data of two adjacent slices, the closed water level at the top of the wall of each layer of the three-dimensional printed object model can be identified by the difference of the data.

In step 103, the wall thickness position in the closed horizontal plane that needs to be repaired is determined as the wall thickness position to be treated.

Determine the wall thickness position that does not meet the demand and may cause line cracks. The determining scheme can be set by itself, for example: simply, if the wall thickness is less than the lowest value, it is determined as the wall thickness position to be processed; for example, it is determined as follows: the optimal printing line width of the printing machine is expressed as W; Wall thickness measurement is performed on the closed horizontal plane, and the measured thickness of all the walls is recorded as Wi; the measured thickness Wi is compared with the integral multiple of W, and if Wi does not satisfy the integral multiple of W, then corresponding The wall thickness position corresponding to Wi is determined as the wall thickness position to be treated.

Step 104: Deform the position of the wall thickness to be treated in the closed horizontal plane to reach a preset wall thickness, and obtain a slice of the three-dimensional printed object model of each layer after the repair.

The preset wall thickness can be set as needed, for example, a minimum size that needs to be met; or, correspondingly, a plurality of wall thickness sizes corresponding to different situations, specifically: (1) m < n, the wall thickness position to be processed The wall thickness is adjusted to n; (2) (x-1)n < m < xn (a <= x <= b), and the wall thickness of the wall thickness to be treated is adjusted to xn; (3) (x-1) n<m<xn(x>b), the wall thickness of the wall thickness to be treated is adjusted to (x-1)n; where m is the actual wall thickness of the wall thickness to be treated, and n is the standard of the print head Width, a, b are natural numbers greater than one.

In this step, the deformation processing of the wall thickness to be treated in the closed horizontal plane can be implemented in various ways, for example, in the inner contour or the outer contour of the closed horizontal plane. The position of the wall thickness to be treated is deformed.

Further, after the deformation treatment of the wall thickness to be treated in the closed horizontal plane, the closed horizontal contour can be smoothly transitioned, and the color transition of the wall thickness to be treated in the closed horizontal plane can be smoothly performed.

Then, the stereoscopic printing can be performed according to the slice of the three-dimensionally printed object model of each layer after the repair.

In the present invention, data difference is compared between two adjacent slices, and the closed horizontal plane at the top of the wall of each layer of the three-dimensional printed object model is identified, and the closed horizontal plane of each slice is recorded; the wall thickness position in the closed horizontal plane that needs to be repaired is determined as The position of the wall thickness to be treated; the position of the wall thickness to be treated in the closed horizontal plane is deformed to reach a preset wall thickness. By adopting the scheme of the invention, instead of modifying the characteristic parameters of the printing machine, the method of detecting and fine-tuning the model is used to adjust the printing, and the problem of the line crack in the outer surface of the printing sheet is improved (the horizontal plane cannot be completely closed), thereby improving The molding quality of the outer horizontal surface of the three-dimensional print.

The following describes the printing method of the three-dimensional printing machine of the present invention by the flow of FIG. 2, which includes the following steps:

In step 201, the three-dimensional print object model is sliced to obtain a slice of each layer of the three-dimensional print object model.

In step 202, data difference comparison is performed on two adjacent slices, and the closed horizontal plane at the top of the wall of each layer of the three-dimensional printed object model is identified, and the closed horizontal plane of each slice is recorded.

The closed horizontal plane identified, ie the characteristic surface.

As shown in the example of Fig. 3, (a) is a three-dimensional model, and (b) and (c) respectively show two slices: slice 1 and slice 2; by comparing slice 1 and slice 2, it is recognized The outer horizontal plane of the slice 2, that is, the closed horizontal plane, is the gray portion in (d), that is, the black portion in (e); (f) the closed horizontal plane of the recognized three-dimensional model is displayed in a stereoscopic manner.

Step 203: Perform wall thickness measurement on the closed water level to determine whether repair is needed. If yes, determine the wall thickness position to be processed, and perform step 204; otherwise, end the process.

The specific implementation of this step is as follows: the optimal printing line width of the printing machine is expressed as W; the wall thickness measurement is performed on the closed horizontal plane, and the measured thickness of all the walls is recorded as Wi; the measured thicknesses Wi and W are The integer multiple value is compared and analyzed. If Wi does not satisfy the integer multiple value of W, the wall thickness position corresponding to the corresponding Wi is determined as the wall thickness position to be processed; if it is satisfied, the repair processing is not required.

Step 204: Perform fine deformation processing on the position of the wall thickness to be processed in the contour of the closed horizontal plane to reach a preset wall thickness, and obtain a slice of the repaired three-dimensional printed object model.

The mechanism of the patching process of the present example is based on the premise of maintaining the quality of the original model and minimizing the printing overhead. The specific implementation manner is: (1) m < n, and the wall thickness of the wall thickness position to be processed is adjusted to n; (x-1)n<m<xn(2<=x<=5), the wall thickness of the wall thickness position to be treated is adjusted to xn; (3)(x-1)n<m<xn(x> 5), the wall thickness of the wall thickness position to be treated is adjusted to (x-1)n; wherein m is the actual wall thickness of the wall thickness to be treated, and n is the standard width of the printing head.

In step 205, a smooth transition is made to the contour in the closed horizontal plane.

Based on the inner contour of the step 204 after the fine deformation processing, a smooth transition can be performed from the surface inner contour characteristic curve, specifically, for example, a quadratic curve or a cubic curve is used to smoothly transition the surface inner contour characteristic curve.

As shown in Fig. 4, (a) is a schematic diagram of the closed horizontal plane before repair, and (b) is a schematic diagram of the deformation process of the contour in the closed horizontal plane and the smooth transition of the characteristic curve, and the gray portion is the repaired portion. Figure 4 shows an example of repairing the inner contour, and the external contour is repaired similarly.

If the stereoprint object model is a color model, a smooth transition of color can be further processed. The smooth transition of the color can be simulated by the gradient principle, which is easy for a person skilled in the art to implement, and will not be described here.

Step 206: Perform stereoscopic printing on the sliced slices of each layer of the three-dimensional print object model.

After the model is patched, it can be stereoscopically printed based on the patched slice as needed.

The example in Fig. 2 analyzes the contour features of the three-dimensional model by slice layer, detects the width value of all printing wall thicknesses in the direction of the relative printing, and combines the optimal printing line width parameters of the actual three-dimensional printing machine to carry out the model. Fine-tuning to meet the characteristics of the three-dimensional printer ensures that all horizontal levels of the print can be completely closed, thereby improving print quality.

5 is a schematic structural view of a printing system of a three-dimensional printing machine of the present invention, the system comprising a model layering module, a closed water level analysis module and a model repair processing module; The printed object model is sliced to obtain a slice of each layer of the stereoscopic print object model; The closed water level analysis module compares the data difference between two adjacent slices, identifies the closed horizontal plane at the top of the wall of each layer of the three-dimensional printed object model, records the closed horizontal plane of each slice, and determines the wall in the closed horizontal plane that needs to be repaired. The thick position is used as the position of the wall thickness to be treated; the model repair processing module deforms the position of the wall thickness to be treated in the closed horizontal plane to reach a preset wall thickness, and obtains a slice of the three-dimensional printed object model of each layer after repairing .

Preferably, the closed water level analysis module comprises a wall thickness detecting sub-module, and the optimal printing line width of the printing machine is expressed as W; the wall thickness measurement is performed on the closed horizontal plane, and the measured thickness of all the walls is recorded. Wi; comparing the measured thickness Wi with the integer multiple of W, if Wi does not satisfy the integer multiple of W, the wall thickness position corresponding to the corresponding Wi is determined as the wall thickness position to be processed.

Preferably, the model repair processing module performs deformation processing on the position of the wall thickness to be treated in the closed horizontal plane by using the following method: (1) m<n, adjusting the wall thickness of the wall thickness position to be treated to n; 2) (x-1)n<m<xn(a<=x<=b), the wall thickness of the wall thickness position to be treated is adjusted to xn; (3)(x-1)n<m<xn(x >b), the wall thickness of the wall thickness position to be treated is adjusted to (x-1)n; wherein m is the actual wall thickness of the wall thickness to be treated, n is the standard width of the printing head, and a and b are greater than 1 Natural number.

Preferably, the model repair processing module deforms the position of the wall thickness to be treated in the contour of the closed horizontal plane, or deforms the position of the wall thickness to be treated in the outer contour of the closed horizontal plane.

Preferably, the model repair processing module deforms the position of the wall thickness to be treated in the closed horizontal plane, and after reaching the preset wall thickness, the smooth transition of the closed horizontal contour is also performed.

Preferably, after the model repair processing module deforms the position of the wall thickness to be treated in the closed horizontal plane, a smooth color transition is also performed on the position of the wall thickness to be treated in the closed horizontal plane.

Preferably, the system further comprises a printing module for performing three-dimensional printing on the sliced slices of the three-dimensional printed object model.

The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalents, improvements, etc., which are made within the spirit and principles of the present invention, should be included in the present invention. Within the scope of protection.

Claims (12)

A printing method for a three-dimensional printing machine, characterized in that the method comprises: slicing a three-dimensional printing object model to obtain a slice of each layer of a three-dimensional printing object model, and each layer of the three-dimensional printing object model comprises a wall and a wall top closure The data of the horizontal plane; compare the data difference between the walls of the adjacent two slices and the closed horizontal plane at the top of the wall, identify the closed horizontal plane at the top of the wall of each layer of the three-dimensional printed object model, record the closed horizontal plane of each slice; determine the closed horizontal plane The position of the wall thickness to be repaired is used as the position of the wall thickness to be treated; the position of the wall thickness to be treated in the closed horizontal plane is deformed to reach a preset wall thickness, and the repaired layer of the three-dimensional printed object model is obtained. slice. The method of claim 1, wherein determining the wall thickness position in the closed horizontal plane that needs to be repaired comprises: indicating the optimum print line width of the printer as W; and performing wall thickness on the closed horizontal plane. Measurement, the thickness of all the measured walls is recorded as Wi; the measured thickness Wi is compared with the integer multiple of W. If Wi does not satisfy the integer multiple of W, the wall thickness corresponding to Wi The position is determined as the wall thickness position to be treated. The method of claim 1, wherein the deformation of the wall thickness to be treated in the closed horizontal plane is calculated as follows: (1) m < n, the wall thickness of the wall thickness to be treated Adjusted to n; (2) (x-1) n < m < xn (a <= x <= b), the position of the wall thickness to be treated The wall thickness is adjusted to xn; (3) (x-1) n < m < xn (x > b), and the wall thickness of the wall thickness position to be treated is adjusted to (x-1) n; wherein m is the The actual wall thickness at which the wall thickness is processed, n is the standard width of the print head, and a and b are natural numbers greater than one. The method of claim 1, wherein the deforming the position of the wall thickness to be treated in the closed horizontal plane comprises: deforming the position of the wall thickness to be treated in the contour of the closed horizontal plane, or The position of the wall thickness to be treated in the outer contour of the closed water plane is deformed. The method of any one of claims 1 to 4, wherein the method for deforming the wall thickness to be treated in the closed horizontal plane is deformed to reach a predetermined wall thickness, the method further comprising: closing the The horizontal contour makes a smooth transition. The method of any one of claims 1 to 4, wherein after the patching of the repaired layers of the three-dimensional print object model, the method further comprises: slicing the repaired layers of the three-dimensional print object model , for three-dimensional printing. A printing system for a three-dimensional printing machine, characterized in that the system comprises a model layering module, a closed water level analysis module and a model repair processing module; the model layering module is for slicing a three-dimensional printing object model Obtaining slices of each layer of the three-dimensional printed object model, each layer of the three-dimensional printed object model including the wall and the closed horizontal surface of the wall; The closed horizontal plane analysis module compares the data of the adjacent two sliced walls and the closed horizontal plane at the top of the wall, and identifies the closed horizontal plane at the top of each wall of the three-dimensional printed object model, and records the closed horizontal plane of each slice; Determining a wall thickness position in the closed water level that needs to be repaired as a wall thickness position to be treated; the model repair processing module deforms the wall thickness position in the closed water level to reach a preset wall thickness, A slice of the repaired layered three-dimensional print object model is obtained. The system of claim 7, wherein the closed water level analysis module comprises a wall thickness detecting sub-module, wherein the optimal printing line width of the printing machine is expressed as W; and the wall thickness measurement is performed on the closed horizontal surface, The thickness of all the measured walls is recorded as Wi; the measured thickness Wi is compared with the integer multiple of W. If Wi does not satisfy the integer multiple of W, the wall thickness corresponding to Wi is determined as Wall thickness position to be treated. The system of claim 7, wherein the model repair processing module performs the deformation processing on the position of the wall thickness to be processed in the closed horizontal plane by using the following method: (1) m < n, the to-be-processed The wall thickness at the wall thickness is adjusted to n; (2) (x-1)n < m < xn (a <= x <= b), and the wall thickness of the wall thickness to be treated is adjusted to xn; (3) ( X-1)n<m<xn(x>b), the wall thickness of the wall thickness to be treated is adjusted to (x-1)n; wherein m is the actual wall thickness of the wall thickness to be treated, n is a column The standard width of the print head, a, b is a natural number greater than 1. The system of claim 7, wherein the model repair processing module deforms the position of the wall thickness to be treated in the contour of the closed horizontal plane, or the waiting in the outer contour of the closed horizontal plane Treatment wall The thick position is deformed. The system of any one of claims 7 to 10, wherein the model repair processing module deforms the position of the wall thickness to be treated in the closed horizontal plane to reach a preset wall thickness, and The closed horizontal profile makes a smooth transition. The system of any one of claims 7 to 10, wherein the system further comprises a printing module for performing three-dimensional printing on the sliced slices of the three-dimensional printed object model.