CN117162474A - 3D printing equipment and printing method for MJP wax spraying - Google Patents
3D printing equipment and printing method for MJP wax spraying Download PDFInfo
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- CN117162474A CN117162474A CN202311233984.3A CN202311233984A CN117162474A CN 117162474 A CN117162474 A CN 117162474A CN 202311233984 A CN202311233984 A CN 202311233984A CN 117162474 A CN117162474 A CN 117162474A
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- 238000007639 printing Methods 0.000 title claims abstract description 75
- 238000010146 3D printing Methods 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000005507 spraying Methods 0.000 title claims abstract description 17
- 239000007788 liquid Substances 0.000 claims abstract description 69
- 238000001514 detection method Methods 0.000 claims abstract description 25
- 239000007921 spray Substances 0.000 claims abstract description 9
- 238000002347 injection Methods 0.000 claims description 10
- 239000007924 injection Substances 0.000 claims description 10
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Abstract
The application discloses 3D printing equipment and a printing method for MJP wax spraying, which belong to the technical field of 3D printing, and comprise a printing equipment main body, wherein a printing component is arranged on one side of the printing equipment main body and comprises a printing spray head, the printing spray head comprises wax outlet nozzles and a flow rate detection module, the 3D printing equipment also comprises a central control module, a flow rate generation module and an early warning module, the flow rates of liquid wax in the wax outlet nozzles are measured in real time, the real-time flow rates are respectively calculated with the pre-stored cross-sectional areas to obtain a plurality of liquid flow rates, the difference between each liquid flow rate and the average flow value is respectively compared with a preset flow rate threshold value, and whether an early warning instruction is generated or not is judged, so that the flow rate of the liquid wax in the wax outlet nozzles can be monitored in real time, and early warning instructions can be timely sent to staff when the liquid flow rates among the wax outlet nozzles cannot keep consistency.
Description
Technical Field
The application belongs to the technical field of 3D printing, and particularly relates to 3D printing equipment and a printing method for MJP wax spraying.
Background
MJP is an additive manufacturing technology, wax spraying is one of the material choices, MJP wax spraying refers to printing by using wax materials in an MJP printing process, and MJP technology simultaneously sprays the wax spraying materials in a molten state through a plurality of nozzles to form objects in a layer-by-layer stacking manner, and the wax spraying materials have the characteristics of low melting point and high viscosity, so that the wax spraying materials are suitable for printing models or parts requiring high precision and complex shapes, and in the prior art, the effect of fast switching and efficiency improvement of the plurality of nozzles in a common 3D printing device is achieved.
For example, chinese patent publication No. CN109834938A discloses a rotary multi-nozzle 3D printer printhead including a rotary frame, nozzles, and an adjusting and locking device, in which a plurality of nozzles are provided, positions of the plurality of nozzles are adjusted according to the processing requirement by the rotary frame, and positioning is performed by means of the adjusting and locking device, and although rapid switching of the nozzles is achieved, the following drawbacks still exist:
in the above patent, a plurality of nozzles are arranged in a printing head of a 3D printer, but only rapid switching is realized among the plurality of nozzles, so that a plurality of nozzles are simultaneously used for spraying wax-spraying materials in a molten state in the mxp printing process, and due to the need of printing high-precision models or parts, the consistency of the materials sprayed by the plurality of nozzles, namely, the consistency of the materials and the consistency of the spraying flow, is generally required, but the 3D printing equipment is easy to fail in the working process, so that the consistency of the spraying flow cannot be maintained, the staff cannot find in time, and the precision of the printed models or parts is not high.
Disclosure of Invention
This section is intended to outline some aspects of embodiments of the application and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section as well as in the description of the application and in the title of the application, which may not be used to limit the scope of the application.
In order to solve the problems, the application adopts the following technical scheme.
A3D printing apparatus for MJP spouts wax, including the printing apparatus main part, one side of printing apparatus main part is provided with the printing subassembly, and the printing subassembly is including printing the shower nozzle, prints the shower nozzle and including wax outlet nozzle and flow velocity detection module, and 3D printing apparatus is still including central control module, flow generation module and early warning module:
the flow velocity detection module is arranged at one side of the wax outlet nozzle and is used for simultaneously acquiring a plurality of real-time flow velocities, wherein the real-time flow velocities are the flow velocities of the wax in the wax outlet nozzle;
the flow generation module is used for calculating a plurality of liquid flows based on the real-time flow speeds and the pre-stored cross-sectional areas respectively; the cross-sectional area is the cross-sectional area of the wax outlet nozzle;
the central control module calculates a flow average value from the plurality of liquid flow meters, compares the difference between each liquid flow and the flow average value with a preset flow threshold value, and judges whether to generate an early warning instruction or not;
and the early warning module sends out early warning instructions according to the early warning instructions.
Preferably, the printing assembly further comprises a printing main box body, the printing spray head further comprises a liquid storage part, the top end of the liquid storage part is communicated with the bottom end fixing of the printing main box body, and a plurality of wax outlet nozzles are communicated with the bottom end fixing of the liquid storage part.
Preferably, the top end of the main printing box body is fixedly provided with a control box, and the flow generating module and the central control module are arranged in the control box.
Preferably, the formula for liquid flow calculation is:
Lfr＝∫∫(Lfv×d Csa )；
wherein Lfr is the liquid flow rate, csa is the cross-sectional area of the wax outlet nozzle, d Csa For a small cross-sectional area of the wax outlet nozzle, lfv is the real-time flow velocity at the small cross-sectional area.
Preferably, the method for determining whether to generate the early warning command by the central control module comprises the following steps:
calculating the difference between each liquid flow and the average flow value, and marking the difference as X 1 、X 2 、X 3 、X 4 .....X n N is the total number of wax outlet nozzles, and a flow threshold is preset>0, the comparison step comprises:
x is to be 1 、X 2 、X 3 、X 4 .....X n Sequentially taking absolute values to form a set M, M= (|X) 1 |、|X 2 |、|X 3 |、|X 4 |.....|X n I), each element in the M is respectively compared with a preset flow threshold, if each element in the M is smaller than the preset flow threshold, no early warning instruction is generated, and if at least one element in the M is larger than the preset flow threshold, the early warning instruction is generated.
Preferably, when the central control module sends out the early warning instruction, a fault instruction is generated at the same time, wherein the fault instruction is used for determining the maintenance sequence of the 3D printing equipment, and the fault instruction comprises a first fault instruction and a second fault instruction.
Preferably, the fault instruction generating method includes:
s1: taking elements in M which are larger than a preset flow threshold value, removing absolute values, and sequentially comparing the elements with 0 after the absolute values are removed;
s2: judging whether the elements with the absolute values removed are smaller than 0, if so, turning to the step S4, otherwise, turning to the step S3;
s3: generating a first fault instruction;
s4: generating a fault classification coefficient, judging whether the fault classification coefficient is larger than a fault classification threshold value, if so, turning to the step S5, otherwise, turning to the step S6;
s5: generating a second fault instruction;
s6: a first failure instruction is generated.
Preferably, the printing assembly further comprises a temperature detection module for obtaining a temperature value inside the main printing box, the printing nozzle further comprises a pressure detection module for obtaining a pressure value inside the liquid storage part, and the fault classification coefficient generation formula is as follows:
wherein Fdc is a fault classification coefficient, liq is a pressure value in the liquid storage part, tem is a temperature value in the main printing box, u 1 And u 2 Are all weight coefficients, and u 2 >u 1 >0。
Preferably, the temperature detection module is arranged at one side of the printing main box body, and the pressure detection module is arranged at one side of the liquid storage part.
The 3D printing method for MJP wax spraying is realized based on the 3D printing equipment, and the 3D printing method comprises the following steps:
simultaneously acquiring a plurality of real-time flowing speeds, wherein the real-time flowing speeds are the flowing speeds of wax in the wax outlet nozzle;
calculating a plurality of liquid flows based on the real-time flow speeds and the pre-stored cross-sectional areas respectively; the cross-sectional area is the cross-sectional area of the wax outlet nozzle;
calculating a flow average value by the liquid flow meters, respectively comparing the difference between each liquid flow and the flow average value with a preset flow threshold value, and judging whether an early warning instruction is generated or not;
and sending out an early warning instruction according to the early warning instruction.
Advantageous effects
Compared with the prior art, the application has the beneficial effects that:
(1) According to the application, the flow velocity of the liquid wax in the wax outlet nozzles is measured in real time, the liquid flow rates are calculated by respectively comparing the real-time flow velocities with the pre-stored cross-sectional areas, then the difference between each liquid flow rate and the average flow rate is respectively compared with the preset flow rate threshold value, whether an early warning instruction is generated is judged, and finally the early warning module is used for sending out early warning instructions, so that the flow rate of the liquid wax in the wax outlet nozzles can be monitored in real time, and when the liquid flow rates among the wax outlet nozzles cannot keep consistent, early warning instructions can be timely sent out to staff, so that the staff can rapidly process the liquid wax, and the printed model or part is prevented from having low precision.
(2) When the central control module sends out the early warning instruction, the fault instruction is generated simultaneously, the fault instruction comprises a first fault instruction and a second fault instruction, the first fault instruction comprises equipment element damage information, the second fault instruction comprises wax outlet blocking information, and a worker can determine the order of maintaining the 3D printing equipment according to the equipment element damage information or the wax outlet blocking information.
Drawings
FIG. 1 is a schematic diagram of a 3D printing apparatus;
fig. 2 is a schematic view of the structure of a printing unit in embodiment 1;
FIG. 3 is a schematic view of a print head;
FIG. 4 is a bottom view of the print head;
FIG. 5 is a top view of a print head;
FIG. 6 is a schematic view of the internal structure of the control box;
fig. 7 is a schematic view of the structure of a printing unit in embodiment 2;
FIG. 8 is a flow chart of a 3D printing method for MJP wax injection;
fig. 9 is a logic diagram of a fault instruction generation method.
The correspondence between the reference numerals and the component names in the drawings is as follows:
10. a printing component; 11. printing a main box body; 12. printing a spray head; 121. a liquid storage part; 122. a wax outlet nozzle; 123. a flow rate detection module; 124. a temperature detection module; 13. a control box; 131. a central control module; 132. a flow generation module; 14. an early warning module; 15. a pressure detection module; 20. a printing apparatus main body; 21. and a display screen.
Detailed Description
In order that the above-recited objects, features and advantages of the present application will become more readily apparent, a more particular description of the application will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, but the present application may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present application is not limited to the specific embodiments disclosed below.
Further, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic can be included in at least one implementation of the application. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
Example 1
The embodiment provides a 3D printing method for mxp wax spraying, the 3D printing method comprising:
s10: simultaneously acquiring a plurality of real-time flow speeds;
specifically, as shown in fig. 1, fig. 2 and fig. 3, the embodiment further provides a 3D printing apparatus for implementing a 3D printing method, which includes a printing apparatus main body 20, a printing assembly 10 is disposed on one side of the printing apparatus main body 20, the printing assembly 10 includes a printing main box 11 and a printing nozzle 12, the printing nozzle 12 includes a liquid storage portion 121, a wax outlet nozzle 122 and a flow velocity detection module 123, the top end of the liquid storage portion 121 is fixedly communicated with the bottom end of the printing main box 11, the bottom end of the liquid storage portion 121 is fixedly communicated with a plurality of wax outlet nozzles 122, the spacing distances of the plurality of wax outlet nozzles 122 are equal, a flow velocity detection module 123 is fixedly disposed on one side of each of the plurality of wax outlet nozzles 122, and the flow velocity detection module 123 may be an ultrasonic detector;
it can be understood that, in this embodiment, the wax ejected from the wax ejection nozzle 122 is in a molten state, the wax flows in the wax ejection nozzle 122, and the real-time flow velocity of the wax can be obtained through the flow velocity detection module 123;
s20: calculating a plurality of liquid flows based on the real-time flow speeds and the pre-stored cross-sectional areas respectively;
it should be noted that, as shown in fig. 2 and 6, the top end of the main printing box 11 is fixedly provided with a control box 13, a flow generating module 132 is provided in the control box 13, a preset cross-sectional area is stored in the flow generating module 132, the cross-sectional area in this embodiment is the cross-sectional area of the wax outlet nozzle 122, the plurality of flow rate detecting modules 123 send the acquired real-time flow velocity to the flow generating module 132, the flow generating module 132 calculates the liquid flow according to the real-time flow velocity and the cross-sectional area, and a specific formula for calculating the liquid flow is as follows:
Lfr＝∫∫(Lfv×d Csa )；
where Lfr is the liquid flow rate, csa is the cross-sectional area of the wax outlet nozzle 122, d Csa For a small cross-sectional area of the wax outlet nozzle 122, lfv is the real-time flow velocity at the small cross-sectional area;
it will be appreciated that since the cross-sectional area of the wax outlet nozzle 122 is not necessarily circular, it is not possible to directly multiply the cross-sectional area of the wax outlet nozzle 122 with the real-time flow rate when calculating the liquid flow rate, the cross-sectional area of the wax outlet nozzle 122 is divided into a plurality of minute cross-sectional areas, the liquid flow rate at the minute cross-sectional area of the wax outlet nozzle 122 is calculated first, and finally the flows are summed to obtain Lfr.
S30: calculating a flow average value by the liquid flow meters, respectively comparing the difference between each liquid flow and the flow average value with a preset flow threshold value, and judging whether an early warning instruction is generated or not;
specifically, a central control module 131 is further disposed in the control box 13, the central control module 131 calculates a flow average value from a plurality of liquid flow meters, and the difference between each liquid flow and the flow average value is marked as X in turn 1 、X 2 、X 3 、X 4 .....X n N is the total number of wax outlet nozzles 122, and the flow threshold is preset>0, the specific comparison step mode comprises:
x is to be 1 、X 2 、X 3 、X 4 .....X n Sequentially taking absolute values to form a set M, M= (|X) 1 |、|X 2 |、|X 3 |、|X 4 |.....|X n I), each element in the M is respectively compared with a preset flow threshold, if each element in the M is smaller than the preset flow threshold, no early warning instruction is generated, and if at least one element in the M is larger than the preset flow threshold, the early warning instruction is generated.
S40: sending out an early warning instruction according to the early warning instruction;
specifically, as shown in fig. 2, in this embodiment, the top end of the printing main box 11 is further provided with an early warning module 14, where the early warning module 14 may be an alarm, an indicator light, or a buzzer, etc., and the early warning module 14 is configured to receive an early warning instruction from the central control module 131, send an early warning instruction to prompt a worker to notice that a fault has occurred in the working process of the 3D printing device, so that consistency of liquid flow between the plurality of wax outlet nozzles 122 cannot be maintained, the worker needs to stop working of the 3D printing device immediately, and avoid low precision of a printed model or part, and meanwhile enable the worker to repair the 3D printing device in time, so as to ensure that MJP wax spraying printing can be completed smoothly;
it should be understood that, in this embodiment, the flow generating module 132 and the central control module 131 are disposed inside the control box 13, for illustration only, the flow generating module 132 and the central control module 131 may be disposed at other positions, for example, the flow generating module 132 and the central control module 131 may be disposed at one side of the printing apparatus main body 20, so long as data transmission can be implemented between the flow generating module 132 and the central control module 131 and the flow rate detecting module 123, and the same way the early warning module 14 may not only be disposed at the top end of the main printing box 11, as long as the staff can timely receive the early warning instruction sent by the early warning module 14.
Example 2
The embodiment is further improved on the basis of embodiment 1, as shown in fig. 3, 5 and 7, the 3D printing apparatus further includes a display screen 21, the display screen 21 is disposed at one end of the printing apparatus main body 20, the printing assembly 10 further includes a temperature detection module 15, the temperature detection module 15 is disposed at one side of the printing main box 11 and is used for detecting a temperature value inside the printing main box 11, one side of the liquid storage portion 121 is provided with a pressure detection module 124, the pressure detection module 124 is used for obtaining a pressure value inside the liquid storage portion 121, when the central control module 131 issues an early warning instruction, a fault instruction is generated at the same time, and the fault instruction is used for instructing a worker to determine an order of maintaining the 3D printing apparatus;
it should be noted that, the fault instruction includes a first fault instruction and a second fault instruction, the first fault instruction includes equipment element damage information, the second fault instruction includes wax outlet blockage information, the display screen 21 is configured to receive the first fault instruction and the second fault instruction, and display corresponding information, a worker determines an order of maintaining the 3D printing device according to the equipment element damage information or the wax outlet blockage information, for example, after the display screen 21 receives the first fault instruction, displays the equipment element damage information, then the worker should determine to first perform inspection of equipment elements in the main printing box 11 according to the equipment element damage information, and if the equipment element is not damaged, check whether the blockage phenomenon occurs in the printing nozzle 12;
the specific generation method of the fault instruction comprises the following steps:
s1: taking elements in M which are larger than a preset flow threshold value, removing absolute values, and sequentially comparing the elements with 0 after the absolute values are removed;
s2: judging whether the elements with the absolute values removed are smaller than 0, if so, turning to the step S4, otherwise, turning to the step S3;
s3: generating a first fault instruction;
s4: generating a fault classification coefficient, judging whether the fault classification coefficient is larger than a fault classification threshold value, if so, turning to the step S5, otherwise, turning to the step S6;
s5: generating a second fault instruction;
s6: generating a first fault instruction;
it will be appreciated that the reasons for failing to maintain consistency of the liquid flow rates between the plurality of wax outlet nozzles 122 are divided into two types, the first type of damage to the internal device components of the printing main casing 11 causes failure of the liquid flow rates between the plurality of wax outlet nozzles 122, the second type of blockage phenomenon occurs in the printing head 12, the second type of failure caused by failure of the liquid flow rates between the plurality of wax outlet nozzles 122 is divided into two types, the first type of failure causes the consistency of the liquid flow rates between the plurality of wax outlet nozzles 122 to be greatly destroyed compared with the liquid flow rates of the other wax outlet nozzles 122, the second type of failure causes the consistency of the liquid flow rates between the single wax outlet nozzle 122 to be too little destroyed compared with the liquid flow rates of the other wax outlet nozzles 122, and the first type of failure causes the liquid flow rates between the single wax outlet nozzle 122 to be too large compared with the liquid flow rates of the other wax outlet nozzles 122, and the corresponding reasons for failure of the liquid flow rates between the single wax outlet nozzle 122 to be too small are determined.
The specific fault classification coefficient generation formula is as follows:
wherein Fdc is a fault classification coefficient, liq is a pressure value in the liquid storage portion 121, tem is a temperature value in the main printing box 11, u 1 And u 2 Are all weight coefficients, and u 2 >u 1 >0。
The above formulas are all formulas with dimensionality removed and numerical value calculated, the formulas are formulas with the latest real situation obtained by software simulation by collecting a large amount of data, and preset parameters, weights and threshold selection in the formulas are set by those skilled in the art according to the actual situation.
The above embodiments may be implemented in whole or in part by software, hardware, firmware, or any other combination. When implemented in software, the above-described embodiments may be implemented in whole or in part in the form of a computer program product. The computer program product comprises one or more computer instructions or computer programs. When the computer instructions or computer program are loaded or executed on a computer, the processes or functions described in accordance with embodiments of the present application are produced in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from one website site, computer, server, or data center to another website site, computer, server, or data center over a wired network or a wireless network. The computer readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that contains one or more sets of available media. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium. The semiconductor medium may be a solid state disk.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, and are not repeated herein.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely one, and there may be additional divisions in actual implementation, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other forms.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.
The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Finally: the foregoing description of the preferred embodiments of the application is not intended to limit the application to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and principles of the application are intended to be included within the scope of the application.
Claims (10)
1. 3D printing apparatus for MJP wax injection, including printing apparatus main part (20), one side of printing apparatus main part (20) is provided with printing assembly (10), its characterized in that: the printing assembly (10) comprises a printing spray head (12), the printing spray head (12) comprises a wax outlet nozzle (122) and a flow rate detection module (123), and the 3D printing device further comprises a central control module (131), a flow generation module (132) and an early warning module (14):
the flow rate detection module (123) is arranged at one side of the wax outlet nozzle (122) and is used for simultaneously acquiring a plurality of real-time flow speeds, wherein the real-time flow speeds are the flow speeds of the wax in the wax outlet nozzle (122);
a flow rate generation module (132) for calculating a plurality of liquid flow rates based on the plurality of real-time flow rates and the pre-stored cross-sectional areas, respectively; the cross-sectional area is the cross-sectional area of the wax outlet nozzle (122);
the central control module (131) calculates a flow average value from the plurality of liquid flow meters, compares the difference between each liquid flow and the flow average value with a preset flow threshold value respectively, and judges whether an early warning instruction is generated or not;
and the early warning module (14) sends out early warning instructions according to the early warning instructions.
2. 3D printing apparatus for mxp wax injection according to claim 1, characterized in that: the printing assembly (10) further comprises a printing main box body (11), the printing spray head (12) further comprises a liquid storage portion (121), the top end of the liquid storage portion (121) is fixedly communicated with the bottom end of the printing main box body (11), and a plurality of wax outlet nozzles (122) are fixedly communicated with the bottom end of the liquid storage portion (121).
3. 3D printing apparatus for mxp wax injection according to claim 2, characterized in that: the top end of the printing main box body (11) is fixedly provided with a control box (13), and the flow generation module (132) and the central control module (131) are arranged in the control box (13).
4. 3D printing apparatus for mxp wax injection according to claim 1, characterized in that: the formula of the liquid flow calculation is:
Lfr＝∫∫(Lfv×d Csa )；
wherein Lfr is the liquid flow rate, csa is the cross-sectional area of the wax outlet nozzle (122), d Csa For a small cross-sectional area of the wax outlet nozzle (122), lfv is the real-time flow velocity at the small cross-sectional area.
5. 3D printing apparatus for mxp wax injection according to claim 1, characterized in that: the method for judging whether to generate the early warning instruction by the central control module (131) comprises the following steps:
calculating the difference between each liquid flow and the average flow value, and marking the difference as X 1 、X 2 、X 3 、X 4 .....X n N is the total number of wax outlet nozzles (122), and a flow threshold is preset>0, the comparison step comprises:
x is to be 1 、X 2 、X 3 、X 4 .....X n Sequentially taking absolute values to form a set M, M= (|X) 1 |、|X 2 |、|X 3 |、|X 4 |.....|X n I), each element in the M is respectively compared with a preset flow threshold, if each element in the M is smaller than the preset flow threshold, no early warning instruction is generated, and if at least one element in the M is larger than the preset flow threshold, the early warning instruction is generated.
6. The 3D printing apparatus for mxp wax injection according to claim 5, characterized in that: and when the central control module (131) sends out an early warning instruction, generating a fault instruction at the same time, wherein the fault instruction is used for determining the maintenance sequence of the 3D printing equipment, and the fault instruction comprises a first fault instruction and a second fault instruction.
7. The 3D printing apparatus for mxp wax injection according to claim 6, characterized in that: the fault instruction generation method comprises the following steps:
s1: taking elements in M which are larger than a preset flow threshold value, removing absolute values, and sequentially comparing the elements with 0 after the absolute values are removed;
s2: judging whether the elements with the absolute values removed are smaller than 0, if so, turning to the step S4, otherwise, turning to the step S3;
s3: generating a first fault instruction;
s4: generating a fault classification coefficient, judging whether the fault classification coefficient is larger than a fault classification threshold value, if so, turning to the step S5, otherwise, turning to the step S6;
s5: generating a second fault instruction;
s6: a first failure instruction is generated.
8. The 3D printing apparatus for mxp wax injection according to claim 7, characterized in that: the printing assembly (10) further comprises a temperature detection module (15) for obtaining the temperature value inside the printing main box body (11), the printing spray head (12) further comprises a pressure detection module (124), the pressure detection module (124) is used for obtaining the pressure value inside the liquid storage part (121), and the fault classification coefficient generation formula is as follows:
wherein Fdc is a fault classification coefficient, liq is a pressure value in the liquid storage part (121), tem is a temperature value in the main printing box (11), u 1 And u 2 Are all weight coefficients, and u 2 >u 1 >0。
9. The 3D printing apparatus for mxp wax injection according to claim 8, characterized in that: the temperature detection module (15) is arranged on one side of the printing main box body (11), and the pressure detection module (124) is arranged on one side of the liquid storage part (121).
10. 3D printing method for MJP wax spraying, realized on the basis of a 3D printing device according to any one of claims 1-9, characterized in that: the method comprises the following steps:
simultaneously acquiring a plurality of real-time flow speeds, wherein the real-time flow speeds are the flow speeds of the wax in the wax outlet nozzle (122);
calculating a plurality of liquid flows based on the real-time flow speeds and the pre-stored cross-sectional areas respectively; the cross-sectional area is the cross-sectional area of the wax outlet nozzle (122);
calculating a flow average value by the liquid flow meters, respectively comparing the difference between each liquid flow and the flow average value with a preset flow threshold value, and judging whether an early warning instruction is generated or not;
and sending out an early warning instruction according to the early warning instruction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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