CN108262950B - Printing method for preventing blanking during movement of FDM printing head in non-printing state - Google Patents
Printing method for preventing blanking during movement of FDM printing head in non-printing state Download PDFInfo
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- CN108262950B CN108262950B CN201810093213.1A CN201810093213A CN108262950B CN 108262950 B CN108262950 B CN 108262950B CN 201810093213 A CN201810093213 A CN 201810093213A CN 108262950 B CN108262950 B CN 108262950B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y10/00—Processes of additive manufacturing
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- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y50/00—Data acquisition or data processing for additive manufacturing
- B33Y50/02—Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
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Abstract
The invention relates to a printing method for preventing blanking when an FDM printing head moves in a non-printing state in the technical field of 3D printing, wherein the printing method realizes that a molten raw material is drawn back when the printing head moves in a non-working state and the drawing back amount is recovered when the printing head reaches a working position by setting the control on the drawing back amount and the recovery amount of the molten raw material in the printing head in software, and effectively controls the phenomenon of wire drawing caused by the falling of the molten raw material when the printing head moves in the non-printing state. In addition, the method controls the discharge amount of the outlet of the printing head through the software control process, thereby avoiding the cost problem and the influence on the working quality of the printing head caused by adding a hardware structure on the printing head and reducing the consumption of the printing head.
Description
Technical Field
The invention relates to the technical field of 3D printing, in particular to a printing control method in Fused Deposition Modeling (FDM) printing technology.
Background
Fused Deposition Modeling (FDM) is one of 3D printing technologies, and plays a crucial role in the field of 3D printing. The FDM forming technology mainly depends on the movement of a printing head and a printing platform to realize the construction of a three-dimensional model. In the whole Fused Deposition Modeling (FDM) process, a wire plays a vital role, FDM equipment extrudes materials in a semi-fluid state, the materials are instantly solidified into thin layers with contours, and the thin layers are stacked layer by layer to form the whole of the three-dimensional part. The method has the advantages of stable dimensional accuracy, long service life, short manufacturing period, no need of investment of moulds and high forming accuracy, and is gradually applied to the casting industry at present.
Because of different structural characteristics of products, the non-discharging state movement of the printing head of the FDM printer, namely the non-printing state movement of the printing head, can exist when the products are printed. In the moving process, the raw material in the molten semi-fluid state in the printing head falls under the action of gravity, and if the problems occur, the defects of the product can be caused, and even the problems of scrapping and the like caused by poor fusion of the product can occur; there is a possibility that the surface of the product is not flat due to the phenomenon of wire drawing or the like on the laminated layer of the product.
Disclosure of Invention
Aiming at the problem of printing quality caused by unexpected blanking when a printing head moves in a non-printing state in the FDM printing process in the prior art, the invention provides a printing method for preventing blanking when the FDM printing head moves in the non-printing state, and the unexpected blanking of a molten raw material is prevented by controlling a certain withdrawal amount of the printing head when the printing head moves in the non-printing state.
The purpose of the invention is realized by the following steps that when the FDM printing head moves in a non-printing state, the printing method for preventing blanking comprises the following steps:
firstly, performing three-dimensional model slicing on a product model to be printed by adopting a three-dimensional slicing technology, and calculating a printing path according to printing parameters;
second, a jump threshold N and a jump height z are set0A pumpback coefficient A and a pumpback recovery amount a;
thirdly, identifying whether the moving process of the printing head is in a working state or in a non-printing state according to the printing path, and switching to the output of the normal printing control program in the sixth step when the moving process is in the working state and switching to the fourth step when the moving process is in the non-printing state;
a fourth step of judging whether or not the molten raw material withdrawal processing is performed when the print head is moved in the non-printing state, specifically, when the print head needs to be moved from the coordinate position (x, y, z) to the coordinate position (x)1,y1Z) the moving distance D of the print head in the XY plane is
(ii) a When the moving distance D is smaller than or equal to the jump threshold value N, the printing head is not pumped back when moving; when the travel distance D is greater than the jump threshold N, then this is doneThe secondary printing head moves to perform pumping back treatment;
and fifthly, the concrete control process of performing pumping back treatment in the non-printing state moving process of the printing head is as follows: 1) calculating a movement of a printhead from a coordinate position (x, y, z) to a coordinate position (x)1,y1,z+z0) The draw back = a movement distance D × a draw back coefficient a; 2) moving the printhead from (x, y, Z,) to (x1, y1, Z + Z0) and withdrawing printhead D a in the process, completing withdrawal of said withdrawn amount of molten raw material; 3) lowering the printhead from (x1, y1, Z + Z0) to (x1, y1, Z) and extruding a pumpback recovery amount a;
and sixthly, repeating the processes of the third step, the fourth step and the fifth step, judging each moving process of the printing head in the whole product printing process, determining the pumpback amount and the pumpback amount in each non-printing state moving process, and finishing the output of the printing control program of the whole product.
In the printing method, the control of the withdrawal amount and the recovery amount of the molten raw material in the printing head is set in software, so that the molten raw material is withdrawn when the printing head moves in a non-working state, the withdrawal amount is recovered when the printing head reaches a working position, and the phenomenon of wire drawing caused by falling of the molten raw material when the printing head moves in the non-printing state is effectively controlled. In addition, the method controls the discharge amount of the outlet of the printing head through the software control process, thereby avoiding the cost problem and the influence on the working quality of the printing head caused by adding a hardware structure on the printing head and reducing the consumption of the printing head.
Preferably, the jump threshold N is 1 to 3 times the inner diameter of the discharge port of the print head.
Preferably, the jump height z is set according to the invention0Equal to the thickness of a single printed layer.
Preferably, the withdrawal coefficient A is 0.1-0.12%, and is the axial feeding amount of the extrusion shaft for the unit distance of the moving printing head. In the invention, the appropriate withdrawal coefficient is reasonably determined according to the fluidity and the gravity action condition of the molten extrusion material and the extrusion material capacity of the single-pitch extrusion shaft, so that the printing head can be effectively prevented from blanking in the non-working moving process.
Preferably, the amount of the recovery from suction is 0.1 to 0.5 times the amount of suction. According to the invention, although the tendency that the pumped-back molten raw material falls in a small amount in a short distance under the action of gravity when the printing head moves in a non-working state is reasonably considered, the pumping-back recovery amount of the printing head is controlled to be 0.1-0.5 times of the pumping-back amount according to the fluidity and the moving distance of the molten raw material, so that the cavity space at the outlet of the printing head after pumping-back is reasonably made up, and the printing head can not only ensure that the printing head does not fall off when moving in a non-printing state, but also realize instant normal discharging printing when moving in place for printing, so as to ensure the printing quality.
Further, in order to improve the printing efficiency, the moving speed of the printing head in the non-printing state is 2-3 times of the moving speed in the working state.
When the printing head moves in a non-printing state, the realization process of the molten raw material pumping back treatment is as follows: sending a reverse signal to a driving motor of the extrusion shaft to enable the extrusion shaft to reversely rotate so as to realize the back pumping of the molten raw material according to the set back pumping quantity; when the non-printing state of the printing head moves in place and the back pumping recovery amount is obtained, the positive rotation signal is sent to the motor again, and the rotation of the back pumping recovery amount is achieved.
Drawings
FIG. 1 is a flow chart of a printing method for preventing blanking when an FDM printing head moves in a non-printing state.
Fig. 2 is a schematic view of a product to be printed in the embodiment.
FIG. 3 is a schematic diagram of a print path of a current print layer.
Detailed Description
As shown in fig. 1, a printing method for preventing blanking when an FDM print head of the present invention moves in a non-printing state specifically includes the following steps, taking the product shown in fig. 2 as an example:
firstly, carrying out three-dimensional model slicing on a product model to be printed by adopting a three-dimensional slicing technology, cutting the three-dimensional model shown in FIG. 2 into 15 layers, and calculating a printing path according to printing parameters;
second, a jump threshold N and a jump height z are set0A pumpback coefficient A and a pumpback recovery amount a;
wherein the jump threshold N is 1-3 times of the inner diameter of the discharge hole of the printing head; jump height z0Equal to the thickness of a single printed layer; the value of the pumpback coefficient A is 0.1-0.12%, and the pumpback coefficient A is the axial feeding amount of the extrusion shaft pumpback in unit distance of the moving of the printing head;
thirdly, identifying whether the moving process of the printing head is in a working state or in a non-printing state according to the printing path, and switching to the output of the normal printing control program in the sixth step when the moving process is in the working state and switching to the fourth step when the moving process is in the non-printing state;
a fourth step of judging whether or not the molten raw material withdrawal processing is performed when the print head is moved in the non-printing state, specifically, when the print head needs to be moved from the coordinate position (x, y, z) to the coordinate position (x)1,y1Z) the moving distance D of the print head in the XY plane is
(ii) a When the moving distance D is smaller than or equal to the jump threshold value N, the printing head is not pumped back when moving; when the moving distance D is larger than the jump threshold value N, performing pumping-back processing on the printing head movement at this time;
and fifthly, the concrete control process of performing pumping back treatment in the non-printing state moving process of the printing head is as follows: 1) calculating a movement of a printhead from a coordinate position (x, y, z) to a coordinate position (x)1,y1,z+z0) The pumpback amount = the movement distance D × pumpback coefficient a; 2) moving the printing head from (x, y, Z) to (x1, y1, Z + Z0) at a speed 2-3 times of the moving speed of the printing head in the working state; and in the process, the printing head D A is withdrawn, and the set withdrawal recovery amount of the molten raw material is withdrawn, wherein the withdrawal recovery amount is 0.1-0.5 times of the withdrawal amount; 3) lowering the printhead from (x1, y1, Z + Z0) to (x1, y1, Z) and extruding a pumpback recovery amount a; when the printing head moves in a non-printing state, the realization process of the molten raw material pumping back treatment comprises the following steps: sending a reverse signal to a driving motor of the extrusion shaft to enable the extrusion shaft to reversely rotate so as to realize the back pumping of the molten raw material according to the set back pumping quantity; when the non-printing state of the printing head moves in place, the back pumping is recoveredAnd when the amount a is measured, sending a forward rotation signal to the motor again to realize the rotation of the set withdrawal recovery amount a. When the number of reverse rotation turns of the driving motor is determined according to the pumpback amount, the number of reverse rotation turns is determined according to the transmission ratio of the extrusion shaft driving mechanism and the feeding amount of each turn of rotation of the extrusion shaft, and the number of forward rotation turns can also be determined according to the number of the reverse rotation turns;
and sixthly, repeating the processes of the third step, the fourth step and the fifth step, judging each moving process of the printing head in the whole product printing process, determining the pumpback amount and the pumpback amount in each non-printing state moving process, and finishing the output of the printing control program of the whole product.
In the printing method, the control on the withdrawal quantity, the recovery quantity and the non-printing state moving speed of the molten raw material in the printing head is set in software, so that the printing head can rapidly move in a non-working state, the molten raw material is withdrawn, the withdrawal quantity is recovered when the molten raw material reaches a working position, and the phenomenon of wire drawing caused by falling of the molten raw material when the printing head moves in the non-printing state is effectively controlled. In addition, the method controls the discharge amount of the outlet of the printing head through the software control process, thereby avoiding the cost problem and the influence on the working quality of the printing head caused by adding a hardware structure on the printing head and reducing the consumption of the printing head.
In this embodiment, in the first step of three-dimensional slicing, the product shown in fig. 2 is cut into 15 layers; in the second step, according to the layering and quality requirements of the product, the pumpback amount with the jumping threshold value N of 10mm, the jumping height Z of 2mm of the thickness of each layer of slices, the pumpback coefficient A of 0.1 percent and the pumpback recovery amount a of 0.5 times is preset; as shown in fig. 3, when the print head is moved to a certain layer, the print head needs to move from the coordinate position (211.6260, -41.0720,2) to the coordinate position (203.9890, -211.6260,2), the moving distance D is 170.7248mm, and the moving distance D of the print head is greater than the jumping threshold value by 10mm, so that the process of moving the print head in the non-printing state is performed on the movement of the print head, specifically, the molten raw material is drawn back from the print head in the process of moving the print head from the coordinate position (211.6260, -41.0720,2) to the coordinate position (203.9890, -211.6260,4), the drawing back amount is 170.7248 x 0.1% =0.1707mm, and when the print head is moved to the coordinate position (211.6260, -41.0720,2), theWhen traveling to the coordinate position (203.9890, -211.6260,4), Z is lowered in the Z coordinate direction0After the length of the print layer reaches 2mm, the extrusion retraction recovery amount is 1.707 × 0.5=0.08535mm, and the determination of the moving process of the print head of each print layer and the presetting of the control method of the moving process are completed in the above manner, and the output of the print control program of the whole product is completed.
Claims (4)
1. A printing method for preventing blanking when an FDM printing head moves in a non-printing state comprises the following steps:
firstly, performing three-dimensional model slicing on a product model to be printed by adopting a three-dimensional slicing technology, and calculating a printing path according to printing parameters;
second, a jump threshold N and a jump height z are set0A pumpback coefficient A and a pumpback recovery amount a;
thirdly, identifying whether the moving process of the printing head is in a working state or in a non-printing state according to the printing path, and switching to the output of the normal printing control program in the sixth step when the moving process is in the working state and switching to the fourth step when the moving process is in the non-printing state;
a fourth step of judging whether or not the molten raw material withdrawal processing is performed when the print head is moved in the non-printing state, specifically, when the print head needs to be moved from the coordinate position (x, y, z) to the coordinate position (x)1,y1Z) the moving distance D of the print head in the XY plane is
(ii) a When the moving distance D is smaller than or equal to the jump threshold value N, the printing head is not pumped back when moving; when the moving distance D is larger than the jump threshold value N, performing pumping-back processing on the printing head movement at this time;
and fifthly, the concrete control process of performing pumping back treatment in the non-printing state moving process of the printing head is as follows: 1) calculating a movement of a printhead from a coordinate position (x, y, z) to a coordinate position (x)1,y1,z+z0) The draw back = a movement distance D × a draw back coefficient a; 2) moving the print head from (x, y, Z,) to (x1, y1, Z + Z0), andduring this process, the printing head D a is withdrawn, completing the withdrawal of said withdrawal quantity of molten raw material; 3) lowering the printhead from (x1, y1, Z + Z0) to (x1, y1, Z) and extruding a pumpback recovery amount a; the pumpback recovery amount is 0.1-0.5 times of the pumpback amount; the value of the pumpback coefficient A is 0.1-0.12%, and the pumpback coefficient A is the axial feeding amount of the extrusion shaft pumpback in unit distance of the moving of the printing head; the moving speed of the printing head in the non-printing state is 2-3 times of the moving speed in the working state;
and sixthly, repeating the processes of the third step, the fourth step and the fifth step, judging each moving process of the printing head in the whole product printing process, determining the pumpback amount and the pumpback amount in each non-printing state moving process, and finishing the output of the printing control program of the whole product.
2. The FDM print head non-printing movement printing method of claim 1, wherein the skip threshold N is 1-3 times the print head discharge hole inner diameter.
3. The FDM print head of claim 1 in which the skip height z is a skip height z in a non-printing movement to prevent blanking0Equal to the thickness of a single printed layer.
4. A printing method for preventing blanking when an FDM printing head of any of claims 1 to 3 moves in a non-printing state, wherein when the printing head moves in the non-printing state, the molten material is pumped back by: sending a reverse signal to a driving motor of the extrusion shaft to enable the extrusion shaft to reversely rotate so as to realize the back pumping of the molten raw material according to the set back pumping quantity; when the non-printing state of the printing head moves in place and the back pumping recovery amount is obtained, the positive rotation signal is sent to the motor again, and the rotation of the back pumping recovery amount is achieved.
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| CN109228340A (en) * | 2018-10-29 | 2019-01-18 | 共享智能铸造产业创新中心有限公司 | A kind of print head applied to FDM printer |
| CN110281345B (en) * | 2019-06-13 | 2021-08-13 | 中国建筑第八工程局有限公司 | Building 3D printing line width compensation method and system |
| CN111391300B (en) * | 2020-03-25 | 2022-04-05 | 四川蓝光英诺生物科技股份有限公司 | Excess material pumpback control method and biological printer |
| CN114683536A (en) * | 2022-03-21 | 2022-07-01 | 江苏科技大学 | Method for determining optimal printing parameters of FDM type 3D printer |
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| "基于3D打印的熔融沉积快速成型工艺若干问题研究";赵天婵等;《机械工程师》;20160410(第4期);第22～23页 * |
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Effective date of registration: 20211125 Address after: 298, ningshuo South Street, Yinchuan economic and Technological Development Zone, Ningxia Hui Autonomous Region Patentee after: KOCEL INTELLIGENT EQUIPMENT Co.,Ltd. Address before: 750000 Science and Technology Building and Office Building of Start-up Base for Small and Medium-sized Enterprises in Yinchuan Economic and Technological Development Zone, 330 Huanghe Road, Xixia District, Yinchuan City, Ningxia Hui Autonomous Region Patentee before: NATIONAL INTELLIGENT FOUNDRY INDUSTRY INNOVATION CENTER |