CN112060590B - 3D printing abandoned layer processing method and system based on multi-parameter quantization - Google Patents

3D printing abandoned layer processing method and system based on multi-parameter quantization Download PDF

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CN112060590B
CN112060590B CN202010870527.5A CN202010870527A CN112060590B CN 112060590 B CN112060590 B CN 112060590B CN 202010870527 A CN202010870527 A CN 202010870527A CN 112060590 B CN112060590 B CN 112060590B
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layer
height
printing
standard
error value
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CN112060590A (en
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杨燕
韩立芳
白洁
王进
连春明
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China Construction Eighth Engineering Division Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
    • B29C64/30—Auxiliary operations or equipment
    • B29C64/386—Data acquisition or data processing for additive manufacturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
    • B29C64/30—Auxiliary operations or equipment
    • B29C64/386—Data acquisition or data processing for additive manufacturing
    • B29C64/393—Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
    • 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
    • B33Y50/00—Data acquisition or data processing for additive manufacturing
    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
    • Y02P90/30—Computing systems specially adapted for manufacturing

Abstract

The invention relates to a 3D printing abandoned layer processing method based on multi-parameter quantization, which comprises the following steps: acquiring the height of the 3D printing component, an allowable error value and the layer height of a standard layer; calculating the number of printing layers and the residual height according to the height of the 3D printing component and the layer height of the standard layer; calculating the accumulated compression deformation of all the standard layers according to the number of printing layers and the printing material; and summing the residual height and the accumulated compression deformation to be used as the layer height of the abandoned layer, judging the layer height of the abandoned layer and the size of an allowable error value, abandoning and printing the abandoned layer if the layer height of the abandoned layer is less than or equal to the allowable error value, and printing a standard layer at the abandoned layer if the layer height of the abandoned layer is greater than the allowable error value. The invention considers the accumulated compression deformation of all standard layers when calculating the layer height of the abandoned layer, thereby improving the precision of the height of the 3D printing component and reducing the error.

Description

3D printing abandoned layer processing method and system based on multi-parameter quantization
Technical Field
The invention relates to the technical field of 3D printing, in particular to a 3D printing abandoned layer processing method and system based on multi-parameter quantization.
Background
At present, a 3D printing technology (e.g., Fused Deposition Modeling (FDM)) using a layer-by-layer printing process is used, and errors of a component are mostly controlled according to a printing layer thickness, that is, for a sliced digital model, the height of the last layer in the printing height direction is compared with the printing layer thickness, and whether the printing layer is continuously printed or directly discarded is determined according to a rounding principle. The final layer height is calculated by subtracting the product of the number of printing layers and the thickness of the printing layer from the total height of the component, but before hardening, each printing layer is compressed and deformed due to gravity extrusion, so that the actual thickness of each printing layer is smaller than the designed thickness of the printing layer, and the error of the final height of the 3D printing component is larger.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a 3D printing abandoned layer processing method and system based on multi-parameter quantization, and solves the problem that the error of the final height of a 3D printing component is large due to compression deformation generated between the hardening of printing layers in the conventional 3D printing.
The technical scheme for realizing the purpose is as follows:
the invention provides a 3D printing abandoned layer processing method based on multi-parameter quantization, which comprises the following steps:
acquiring a height and an allowable error value of the 3D printing member;
acquiring the layer height of a standard layer for 3D printing;
calculating the number of printing layers and the residual height according to the height of the 3D printing component and the layer height of the standard layer;
calculating the accumulated compression deformation of all standard layers according to the number of printing layers and the printing materials; and
and summing the residual height and the accumulated compression deformation to be used as the layer height of a abandoned layer, judging the layer height of the abandoned layer and the size of the allowable error value, abandoning and printing the abandoned layer if the layer height of the abandoned layer is less than or equal to the allowable error value, and printing a standard layer at the abandoned layer if the layer height of the abandoned layer is greater than the allowable error value.
The invention provides a 3D printing abandoned layer processing method, which considers the accumulated compression deformation of all standard layers when calculating the layer height of the abandoned layer, namely summing the accumulated compression deformation and the residual height to be the layer height of the abandoned layer, further judging the size of the abandoned layer and an allowable error value, directly abandoning the last layer for no printing if the layer height of the abandoned layer is within the allowable error range, and printing one more standard layer if the layer height of the abandoned layer is beyond the allowable error range, thereby improving the precision of the 3D printing component height and reducing the error.
The invention further improves a 3D printing abandoned layer processing method based on multi-parameter quantification, wherein the step of calculating the accumulated compression deformation of all standard layers according to the number of printing layers and printing materials comprises the following steps:
acquiring the volume weight of a printing material and the hardening time of a standard layer;
acquiring the time for printing a standard layer;
calculating a first compressive deformation amount of the first to N-m-th layers according to the following formula one:
Figure BDA0002650959460000021
Figure BDA0002650959460000022
calculating a second compressive deformation amount of the N-m +1 th to nth layers according to the following formula two:
Figure BDA0002650959460000023
Figure BDA0002650959460000024
xi in formula one and formula two1Is the first compression deformation amount, ξ2Is the second compression deformation amount,. DELTA.hiIs the cumulative amount of deformation of the ith layer, gamma is the volume weight of the printing material, hiIs the layer height of the i-th layer, hi+jIs the layer height of the (i + j) th layer, N is the number of printing layers, m is equal to the hardening time of a standard layer divided by the time of printing a standard layer, and is taken as an integer, E (T)i) Is TiModulus of deformation, T, corresponding to the momentiFor the moment when the i-th layer printing is completed, E (T)i+j) Is Ti+jModulus of deformation, T, corresponding to the momenti+jThe moment when the printing of the (i + j) th layer is finished;
summing the first compressive deformation amount and the second compressive deformation amount to obtain the cumulative compressive deformation amount.
The invention further improves the 3D printing abandoned layer processing method based on multi-parameter quantization, wherein the allowable error value is set according to the height of the 3D printing component, when the layer height of the abandoned layer is judged to be larger than the allowable error value,
further judging whether the layer height of the standard layer is smaller than the sum of the layer height of the abandon layer and the allowable error value;
if not, adjusting the layer height of the standard layer to enable the layer height of the standard layer to be smaller than the sum of the layer height of the abandoned layer and the allowable error value, and recalculating the layer height of the abandoned layer.
The 3D printing abandon layer processing method based on multi-parameter quantization is further improved in that after the layer height of a standard layer for 3D printing is obtained, whether the layer height of the standard layer is smaller than twice of the allowable error value is judged, and if not, the layer height of the standard layer is adjusted to enable the layer height of the standard layer to be smaller than twice of the allowable error value.
The 3D printing abandon layer processing method based on multi-parameter quantization is further improved in that the size of the allowable error value is synchronously adjusted when the layer height of the standard layer is adjusted.
The invention also provides a 3D printing abandon layer processing system based on multi-parameter quantization, which comprises:
an input unit for inputting a height of the 3D printing member, an allowable error value, and a layer height of a standard layer for 3D printing;
the calculation unit is connected with the input unit and used for calculating the number of printing layers and the residual height and calculating the accumulated compression deformation; and
and the processing unit is connected with the input unit and the calculation unit and used for summing the residual height and the accumulated compression deformation to be used as the layer height of a discarded layer, judging the layer height of the discarded layer and the allowable error value, outputting a result of discarding and printing the discarded layer if the layer height of the discarded layer is less than or equal to the allowable error value, and outputting a result of printing a standard layer at the discarded layer if the layer height of the discarded layer is greater than the allowable error value.
The 3D printing rejection layer processing system based on multi-parameter quantization is further improved in that the computing unit comprises a first computing module and a second computing module;
the input unit is also used for inputting the volume weight of the printing material, the hardening time of one standard layer and the time for printing one standard layer;
the first calculation module is connected with the input unit and calculates a first compression deformation amount from the first layer to the N-m layer according to the formula I, wherein the formula I is as follows:
Figure BDA0002650959460000031
Figure BDA0002650959460000041
the second calculation module is connected with the input unit and calculates a second compression deformation from the (N-m + 1) th layer to the (N) th layer according to the formula II, wherein the formula II is as follows:
Figure BDA0002650959460000042
Figure BDA0002650959460000043
xi in formula one and formula two1Is the first compression deformation amount, ξ2Is the second compression deformation amount,. DELTA.hiIs the cumulative amount of deformation of the ith layer, gamma is the volume weight of the printing material, hiIs the layer height of the i-th layer, hi+jIs the layer height of the i + j th layer, N is printingNumber of layers, m being equal to the result of the calculation of the hardening time of one standard layer divided by the time of printing one standard layer, E (T)i) Is TiModulus of deformation, T, corresponding to the momentiFor the moment when the i-th layer printing is completed, E (T)i+j) Is Ti+jModulus of deformation, T, corresponding to the momenti+jThe moment when the printing of the i + j-th layer is completed.
The 3D printing abandon layer processing system based on multi-parameter quantization is further improved in that the first calculation module and the second calculation module are also connected with the processing unit and send the calculated first compression deformation amount and second compression deformation amount to the processing unit.
The 3D printing abandoned layer processing system based on multi-parameter quantization is further improved in that when the processing unit judges that the layer height of the abandoned layer is larger than the allowable error value, whether the layer height of the standard layer is smaller than the sum of the layer height of the abandoned layer and the allowable error value is further judged, and if not, the alarm prompt is given to input the layer height of the standard layer again.
The 3D printing abandon layer processing system based on multi-parameter quantization is further improved in that the processing unit is also used for judging whether the layer height of the standard layer is less than twice of the allowable error value, and if not, the processing unit gives an alarm to prompt the user to input the layer height of the standard layer again.
Drawings
Fig. 1 is a flowchart of a 3D print discard layer processing method based on multi-parameter quantization according to the present invention.
FIG. 2 is a system diagram of a 3D print reject layer processing system based on multi-parameter quantization according to the present invention.
FIG. 3 is a schematic diagram of a slicing structure of a 3D printing component in the method and system for processing a 3D printing reject layer based on multi-parameter quantization according to the present invention.
Fig. 4 is a schematic diagram of calculating the accumulated compressive deformation in the 3D printing reject layer processing method and system based on multi-parameter quantization according to the present invention.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
Referring to fig. 1, the invention provides a 3D printing abandoned layer processing method and system based on multi-parameter quantization, which are used for solving the problem that the height error of a 3D printing component is large because the compression deformation of each printing layer is not considered in the calculation of the height of the abandoned layer in the prior art. According to the 3D printing abandoned layer processing method and system, the compressive deformation amount before each printing layer is hardened is taken into consideration and recorded as the accumulated compressive deformation amount, so that the layer height of the abandoned layer is more real, and the error requirement can be met. In addition, the invention also solves the problem that the error of the component in the existing 3D printing is controlled by the thickness of the printing layer, the allowable error value of the invention is designed according to the size of the 3D printing component, different error control requirements can be given to components with different sizes, and when judging whether the abandoned layer is printed or not, the size between the layer height of the standard layer and the allowable error value is also judged, so that the selection of the proper 3D printing equipment, the proper printing material and the proper size of the printing head are realized, and the actual height of the 3D printing component can not exceed the upper error limit when the abandoned layer is printed. The following describes the 3D printing reject layer processing system and method based on multi-parameter quantization with reference to the accompanying drawings.
Referring to fig. 2, a system diagram of a 3D print rejection layer processing system based on multi-parameter quantization according to the present invention is shown. The following describes the 3D printing rejection layer processing system based on multi-parameter quantization in accordance with the present invention with reference to fig. 2.
As shown in fig. 2, the 3D printing rejection layer processing system based on multi-parameter quantization of the present invention includes an input unit 21, a calculation unit 22, and a processing unit 23, wherein the input unit 21 is connected to the calculation unit 22, the processing unit 23 is connected to the input unit 21 and the calculation unit 22, and the input unit 21 is configured to input a height of a 3D printing member, an allowable error value, and a layer height of a standard layer of the 3D printing member; the calculating unit 22 is configured to receive the height of the 3D printing member, the allowable error value, and the layer height of the standard layer of the 3D printing member, which are input by the input unit 21, calculate the number of printing layers and the remaining height according to the height of the 3D printing member and the layer height of the standard layer, and calculate an accumulated compressive deformation amount, which is the sum of the compressive deformation amounts of all the standard layers, by the calculating unit 22. The processing unit 23 is configured to sum the remaining height and the accumulated compressive deformation to obtain a layer height of the discarded layer, and further determine the layer height of the discarded layer and a permissible error value, and if the layer height of the discarded layer is less than or equal to the permissible error value, output a result of printing the discarded layer, and if the layer height of the discarded layer is greater than the permissible error value, output a result of printing a standard layer at the discarded layer.
Referring to fig. 3, the 3D printing member 30 has a total height H, the bottom layer of the 3D printing member 30 is a leveling layer 31, and the leveling layer 31 has a thickness H0The total height H of the 3D printing member 30 minus the thickness H of the screed layer 310After that, the number N of print layers can be obtained by dividing the layer height H of the standard layer 32, and if the layer height H can be completely divided, the discard layer 33 is not present, but in general, the remainder is present, and the layer height of the discard layer 33 is Δ H ', and if the layer height H of the discard layer 33 is calculated, the layer height H ' of all the standard layers 32 is subtracted by directly subtracting the thickness of the leveling layer 31 from the total height of the 3D printing member 30, that is, Δ H ' is equal to H-H0N × h, the actual error of the 3D printing member is large. As shown in fig. 4, the printing layers i to i + m are unhardened layers, and in the hardening process of the printing layer i, the printing layer i is subjected to gravity extrusion from the printing layer i +1 to the printing layer i + m, so that compression deformation is generated, all the standard layers are subjected to compression deformation after printing until before hardening, if the layer height Δ h' of the abandoning layer 33 is judged, the compression deformation of all the standard layers is not considered, that is, the compression deformation is also accumulated, and after the abandoning printing abandoning layer is abandoned, the actual height of the manufactured 3D printing component does not meet the error requirement. Therefore, the processing unit 23 of the present invention can improve the calculation accuracy of the height of the sacrificial layer by using the sum of the remaining height and the accumulated compressive deformation amount as the height of the sacrificial layer when calculating the height of the sacrificial layer, thereby improving the height accuracy of the 3D printing member and avoiding the occurrence of a phenomenon that the error requirement is not satisfied.
In one embodiment of the present invention, the calculating unit 22 comprises a first calculating module and a second calculating module, the input unit 21 is further configured to input the volume weight of the printing material, the hardening time of one standard layer, and the time for printing one standard layer, the first calculating module and the second calculating module are connected to the input unit 21 and the processing unit 23, the first calculation module is internally stored with a first formula and used for calculating a first compression deformation from the first layer to the N-m layer according to the first formula, the second calculation module is internally stored with a second formula, the second calculation module is used for calculating a second compression deformation amount from the (N-m + 1) th layer to the Nth layer according to a formula II, wherein N is the number of printing layers, and m is equal to the calculation result of dividing the hardening time of one standard layer by the time of printing one standard layer.
The first formula is as follows:
Figure BDA0002650959460000061
Figure BDA0002650959460000062
the second formula is:
Figure BDA0002650959460000063
Figure BDA0002650959460000071
in the first and second formulas, ξ1Is the first compression deformation amount, ξ2Is the second compression deformation amount,. DELTA.hiIs the cumulative amount of deformation of the ith layer, gamma is the volume weight of the printing material, hiIs the layer height of the i-th layer, hi+jIs the layer height of the (i + j) th layer, N is the number of printing layers, m is equal to the hardening time of a standard layer divided by the time of printing a standard layer, and is taken as an integer, E (T)i) Is TiModulus of deformation, T, corresponding to the momentiMoment of printing completion for i-th layer，E(Ti+j) Is Ti+jModulus of deformation, T, corresponding to the momenti+jThe moment when the printing of the i + j-th layer is completed.
The first calculation module calculates the first compression deformation amount according to the hardening time t of the standard layer inputted by the input unit 210And time t for printing a standard layeriThe value of m, i.e. t, is calculated0/tiAnd m, taking an integer from the calculation result of m. The deformation modulus E (T) is a function of time, and can be drawn through experiments, so that the deformation modulus corresponding to each time can be obtained. And the first calculation module substitutes the volume weight of the printing material, the layer height of the standard layer and the deformation modulus into a formula I to obtain a value of the first compression deformation. Similarly, the second calculation module can obtain a second compression deformation value by substituting the volume weight of the printing material, the layer height of the standard layer and the deformation modulus into the formula II.
Further, the calculation unit sums the first compression deformation amount and the second compression deformation amount to obtain an accumulated compression deformation amount, and sends the accumulated compression deformation amount to the processing unit 23.
The calculation unit 22 assumes that the compressive deformation of each printing layer is caused by gravity when calculating the accumulated compressive deformation, and does not consider the influence of other factors, such as a material creep factor; assuming that the compression of the printed layer by the upper printed layer is completed within a short time after the printing of the upper printed layer is completed, the amount of time is much less than the printing duration and the material hardening time, and can be approximately regarded as instantaneous; the printing of the respective layer materials is assumed to be the same. For convenient calculation, time sections are divided according to the number of printing layers, and the time when the printing of the (i-1) th layer is finished is marked as Ti-1The corresponding deformation modulus is E (T)i-1) (ii) a The moment when the printing of the ith layer is finished is recorded as TiCorresponding to a deformation modulus of E (T)i) (ii) a The moment when the printing of the (i + 1) th layer is completed is recorded as Ti+1The corresponding deformation modulus is E (T)i+1) (ii) a For the ith layer, ti＝Ti-Ti-1. As shown in FIG. 4, first, T is calculatedi-1To TiThe ith layer in the moment is from the layerCompression set Δ h by weighti,0：
Figure BDA0002650959460000072
In the above formula σxIs of length hiThe axial pressure at the position of the member x, which is equal to the dead weight in the case of compression by the dead weight, i.e. σ ═ γ × h, and accordingly σ, thenx＝γ*(hi-x), E (T) is the deformation modulus of the component, γ is the bulk weight of the printing material, hiIs the layer height of the ith layer. If approximate to consider Ti-1To TiThe deformation modulus in the time period is E (T)i) Then Δ hi,0The calculation result is as follows:
Figure BDA0002650959460000081
then calculate TiTo Ti+1Compression deformation delta h of the ith layer under the action of the self weight of the (i + 1) th layer at the momenti,1：
Figure BDA0002650959460000082
In the above formula σi+1Is the weight of the (i + 1) th layer, hi+1The layer height of the (i + 1) th layer; from TiTo Ti+mAt the moment, the ith layer is not hardened, the ith layer generates continuous compression deformation under the action of the dead weight of the m printing layers arranged on the ith layer, and the cumulative deformation amount of the ith layer is as follows:
Figure BDA0002650959460000083
when the design layer height of each printing layer is the same, the layer height of the standard layer is h, and the accumulated deformation of the ith layer can be simplified as follows:
Figure BDA0002650959460000084
first compression deformation xi of the first to N-m layers1Comprises the following steps:
Figure BDA0002650959460000085
the number of the layers of the non-hardened layers arranged from the (N-m + 1) th layer to the Nth layer is gradually decreased layer by layer, and the accumulated deformation of the ith layer is as follows:
Figure BDA0002650959460000086
that is, the nth layer only takes into account the amount of deformation due to its own weight. When the design layer height of each printing layer is the same, the layer height of the standard layer is recorded as h, and the accumulated deformation of the ith layer can be simplified as follows:
Figure BDA0002650959460000087
the second compression deformation amount from the N-m +1 th layer to the N-th layer is xi2：
Figure BDA0002650959460000088
In an embodiment of the present invention, the first calculating module and the second calculating module are further connected to the processing unit, and send the calculated first compression deformation amount and the second compression deformation amount to the processing unit 23. The processing unit 23 sums the first amount of compressive deformation, the second amount of compressive deformation and the remaining height to obtain the layer height of the sacrificial layer.
In an embodiment of the present invention, when determining that the layer height of the discarded layer is greater than the allowable error value, the processing unit 23 further determines whether the layer height of the standard layer is less than the sum of the layer height of the discarded layer and the allowable error value, and if not, the alarm prompts to re-input the layer height of the standard layer. Specifically, if the allowable error value is set to e, it means that the actual height of the 3D printing member may be within the design height ± the allowable error value e, so even if the layer height of the sacrificial layer is greater than the allowable error value, it is necessary to satisfy that the layer height of the standard layer minus the layer height of the sacrificial layer should be smaller than the allowable error value, so that it can satisfy that the actual height of the 3D printing member is within the allowable error range.
Further, when the layer height of the standard layer is input again, the layer height of the standard layer is adjusted to be small, the layer height of the standard layer is determined by the 3D printing equipment, the printing material and the size of the printing head, after the 3D printing equipment, the printing material and the size of the printing head are determined, the printing head and the printing equipment have an adjusting range, the layer height of the standard layer can be adjusted correspondingly by the printing head and the printing equipment in the adjusting range, and the 3D printing forming quality can be ensured. Such as: but beat printer head apart from the height of printing the operation face and adjust at certain extent, when adjusting at this certain extent and beat printer head apart from the height of printing the operation face, the layer height that can corresponding regulation printed layer just can ensure 3D and print the shaping quality. When the layer height of the standard layer is adjusted, if the printing head and the printing equipment need to be adjusted to exceed the adjusting range, the appropriate 3D printing equipment, the appropriate printing material and the appropriate size of the printing head need to be selected according to actual conditions, the size of the printing head is reduced, the discharge amount at the corresponding printing head is reduced, the layer height of the printing layer (i.e. the layer height of the standard layer) is reduced, and otherwise, the layer height of the standard layer is increased.
In another preferred embodiment, when the layer height of the standard layer is determined to be not less than the sum of the layer height of the reject layer and the allowable error value, the allowable error value may be adjusted to be larger, but the allowable error value should be adjusted within the specification range. The corresponding error requirement exists in the specification for a component with a certain size, for example, if the height of the component is 10cm, the error requirement can be between 0.5mm and 1 mm; if the height of the member is 3m, the tolerance requirement can be between 5mm and 10 mm. The magnitude of the allowable error value may also be adjusted so that the layer height of the standard layer is less than the sum of the layer height of the reject layer and the allowable error value.
Further, it is also possible to allow an error value for the adjustment in synchronization when adjusting the layer height of the standard layer, so that the reject layer process can make the 3D printing member meet the error requirement.
In an embodiment of the present invention, the processing unit 23 is further configured to determine whether the layer height of the standard layer is less than twice of the allowable error value, and if not, the alarm prompts to re-input the layer height of the standard layer. The processing unit 23 determines whether the layer height of the standard layer is less than twice the allowable error value before calculating the layer height of the reject layer, and if the layer height of the standard layer is less than twice the allowable error value, the layer height of the standard layer minus the layer height of the reject layer is inevitably less than the allowable error value, so that it is possible to ensure that the actual height of the 3D member can be within the allowable error range when printing the reject layer.
Further, the processing unit 23 may perform a function of determining whether the layer height of the standard layer is less than twice the allowable error value or a function of determining whether the layer height of the standard layer is less than the sum of the layer height of the reject layer and the allowable error value according to an input instruction of a user. Preferably, a first instruction button (fast calculation method) and a second instruction button (iterative calculation method) are set on an operation interface of the processing system, a user forms a corresponding instruction by selecting the corresponding buttons, when the first instruction button is selected, the processing unit 23 first determines whether the layer height of the standard layer is less than twice of an allowable error value, when the determination result is yes, the calculating unit calculates the number of printing layers, the remaining height and the accumulated compression deformation amount, and the processing unit 23 then determines the subsequent discarded layer, so that the processing unit 23 can quickly obtain the determination result of the discarded layer. When the second instruction button is selected, the calculating unit calculates the number of printing layers, the residual height and the accumulated compression deformation amount, the processing unit 23 judges the layer height of the abandoned layer, and also judges whether the layer height of the standard layer is smaller than the sum of the layer height of the abandoned layer and an allowable error value, so that the allowable error value can be designed to be smaller, and the precision control requirement of the 3D printing component can be improved. The principle of the rapid calculation method is as follows: and judging whether the layer height h of the standard layer is less than twice of the allowable error value e, and if not, adjusting the layer height h and/or the allowable error value e to ensure that h <2 e. The principle of the iterative computation method is: and judging whether the layer height h of the standard layer minus the layer height delta h 'of the abandoned layer is smaller than an allowable error value e, and if not, adjusting the layer height h and/or the allowable error value e to ensure h-delta h' < e.
The 3D printing abandoned layer processing system based on multi-parameter quantization realizes that the allowable error value is designed according to the size of a 3D printing component, and the abandoned layer is comprehensively judged by combining the thickness of the printing layer (namely the layer height of the standard layer) and the accumulated compressive deformation, so as to decide whether to continuously print a standard layer or abandon the abandoned layer. The problem of the machining error of component direction of height is decided by the printing layer thickness in the current 3D prints, can't carry out reasonable adjustment according to the size of component self is solved for the error control that the component printed the height no longer depends on the printing layer thickness, and control accuracy is higher, and control mode is more nimble. The invention considers the accumulated compression deformation of each printing layer when calculating the layer height of the abandoned layer, and improves the calculation precision of the layer height of the abandoned layer, thereby ensuring that the actual height of the 3D printing component is within the error requirement range.
The invention also provides a 3D printing abandoned layer processing method based on multi-parameter quantization, and the processing method is explained below.
The invention discloses a 3D printing abandoned layer processing method based on multi-parameter quantization, which comprises the following steps:
as shown in fig. 1, step S11 is performed to acquire the height of the 3D printing member and an allowable error value; then, go to step S12;
executing step S12, and acquiring the layer height of the standard layer for 3D printing; then, step S13 is executed;
executing step S13, calculating the number of printing layers and the residual height according to the height of the 3D printing component and the layer height of the standard layer; then, step S14 is executed;
step S14 is executed, and the accumulated compression deformation of all standard layers is calculated according to the number of printing layers and the printing materials; then, go to step S15;
performing step S15 of summing the residual height and the accumulated compressive deformation amount as a layer height of a sacrificial layer, followed by performing step S16;
executing step S16, determining whether the layer height of the discard layer is greater than the allowable error value, if so, executing step S7, otherwise, executing step S18;
executing step S17 to print a standard layer on the discarded layer;
step S18 is executed to discard printing the discard layer.
The 3D printing abandoned layer processing method considers the accumulated compression deformation of all standard layers when calculating the layer height of the abandoned layer, namely sums the accumulated compression deformation and the residual height to be the layer height of the abandoned layer, further judges the size of the abandoned layer and the allowable error value, directly abandons the last layer for not printing if the layer height of the abandoned layer is within the allowable error range, and prints one more standard layer if the layer height of the abandoned layer exceeds the allowable error range, thereby improving the precision of the 3D printing component height and reducing the error.
In one embodiment of the present invention, the step of calculating the cumulative compression deformation of all the standard layers according to the number of printing layers and the printing material includes:
acquiring the volume weight of a printing material and the hardening time of a standard layer;
acquiring the time for printing a standard layer;
calculating a first compression deformation amount of the first to N-m-th layers according to the following formula:
Figure BDA0002650959460000111
Figure BDA0002650959460000112
calculating a second compressive deformation amount of the N-m +1 th to nth layers according to the following formula two:
Figure BDA0002650959460000113
Figure BDA0002650959460000114
xi in formula one and formula two1Is the first compression deformation amount, ξ2Is the second compression deformation amount,. DELTA.hiIs the cumulative amount of deformation of the ith layer, gamma is the volume weight of the printing material, hiIs the layer height of the i-th layer, hi+jIs the layer height of the i + j th layer, N is the number of printing layers, and m is equal to the hardness of a standard layerThe result of the calculation of the divided time by the time of printing a standard layer is taken as an integer, E (T)i) Is TiModulus of deformation, T, corresponding to the momentiFor the moment when the i-th layer printing is completed, E (T)i+j) Is Ti+jModulus of deformation, T, corresponding to the momenti+jThe moment when the printing of the (i + j) th layer is finished;
and summing the first compression deformation amount and the second compression deformation amount to obtain an accumulated compression deformation amount.
In one embodiment of the present invention, the allowable error value is set according to the height of the 3D printing member, and when the layer height of the discarded layer is determined to be greater than the allowable error value, it is further determined whether the layer height of the standard layer is less than the sum of the layer height of the discarded layer and the allowable error value; if not, adjusting the layer height of the standard layer to enable the layer height of the standard layer to be smaller than the sum of the layer height of the abandon layer and the allowable error value, and recalculating the layer height of the abandon layer. The layer height of the standard layer should be adjusted small at this time.
Further, when adjusting the layer height of the standard layer, this is achieved by replacing the 3D printing apparatus and/or replacing the size of the 3D print head.
In an embodiment of the present invention, when the layer height of the standard layer is determined to be not less than the sum of the layer height of the reject layer and the allowable error value, the allowable error value is adjusted to be larger, and the allowable error value is adjusted within an acceptable error range, so that the layer height of the standard layer is less than the sum of the layer height of the reject layer and the allowable error value.
In one embodiment of the present invention, when determining whether the layer height of the standard layer is less than the sum of the layer height of the discarded layer and the allowable error value, the layer height of the standard layer is decreased, the allowable error value is decreased, the layer height of the discarded layer is recalculated, and the size of the discarded layer and the allowable error value is re-determined.
In one embodiment of the present invention, after the layer height of the standard layer for 3D printing is obtained, it is determined whether the layer height of the standard layer is less than twice of an allowable error value, and if not, the layer height of the standard layer is adjusted so that the layer height of the standard layer is less than twice of the allowable error value.
While the present invention has been described in detail and with reference to the embodiments thereof as illustrated in the accompanying drawings, it will be apparent to one skilled in the art that various changes and modifications can be made therein. Therefore, certain details of the embodiments should not be construed as limitations of the invention, except insofar as the following claims are interpreted to cover the invention.

Claims (6)

1. A3D printing abandon layer processing method based on multi-parameter quantization is characterized by comprising the following steps:
acquiring a height and an allowable error value of the 3D printing member;
acquiring the layer height of a standard layer for 3D printing;
calculating the number of printing layers and the residual height according to the height of the 3D printing component and the layer height of the standard layer;
calculating the accumulated compression deformation of all standard layers according to the number of printing layers and the printing materials; and
summing the residual height and the accumulated compression deformation to be used as the layer height of a abandoned layer, judging the layer height of the abandoned layer and the size of the allowable error value, if the layer height of the abandoned layer is less than or equal to the allowable error value, abandoning and printing the abandoned layer, and if the layer height of the abandoned layer is greater than the allowable error value, printing a standard layer at the abandoned layer;
receiving a rapid calculation method or an iterative calculation method selected by a user;
when an iterative calculation method is carried out, the allowable error value is set according to the height of the 3D printing component, when the layer height of the abandoned layer is judged to be larger than the allowable error value,
further judging whether the layer height of the standard layer is smaller than the sum of the layer height of the abandon layer and the allowable error value;
if not, adjusting the layer height of the standard layer to enable the layer height of the standard layer to be smaller than the sum of the layer height of the abandoned layer and the allowable error value, and recalculating the layer height of the abandoned layer;
when a fast calculation method is carried out, after the layer height of a standard layer of 3D printing is obtained, whether the layer height of the standard layer is smaller than twice of the allowable error value or not is judged, and if not, the layer height of the standard layer is adjusted so that the layer height of the standard layer is smaller than twice of the allowable error value.
2. The method of claim 1, wherein the step of calculating the accumulated compressive deformation of all standard layers based on the number of print layers and printing material comprises:
acquiring the volume weight of a printing material and the hardening time of a standard layer;
acquiring the time for printing a standard layer;
calculating a first compressive deformation amount of the first to N-m-th layers according to the following formula one:
Figure FDA0003652684290000011
Figure FDA0003652684290000021
calculating a second compressive deformation amount of the N-m +1 th to nth layers according to the following formula two:
Figure FDA0003652684290000022
Figure FDA0003652684290000023
xi in formula one and formula two1Is the first compression deformation amount, ξ2Is the second compression deformation amount,. DELTA.hiIs the cumulative amount of deformation of the ith layer, gamma is the volume weight of the printing material, hiIs the layer height of the i-th layer, hi+jIs the layer height of the i + j th layer, N is the number of printing layers, and m is equal toThe result of the calculation of the hardening time of a standard layer divided by the time of printing a standard layer is taken as an integer, E (T)i) Is TiModulus of deformation, T, corresponding to the momentiFor the moment when the i-th layer printing is completed, E (T)i+j) Is Ti+jModulus of deformation, T, corresponding to the momenti+jThe moment when the printing of the (i + j) th layer is finished;
summing the first compressive deformation amount and the second compressive deformation amount to obtain the cumulative compressive deformation amount.
3. The method of claim 1, wherein the allowable error value is synchronously adjusted when adjusting the layer height of the standard layer.
4. A 3D print rejection layer processing system based on multiparameter quantization, comprising:
an input unit for inputting a height of the 3D printing member, an allowable error value, and a layer height of a standard layer for 3D printing;
the calculating unit is connected with the input unit and used for calculating the number of printing layers and the residual height and calculating the accumulated compression deformation; and
the processing unit is connected with the input unit and the calculating unit and used for summing the residual height and the accumulated compression deformation to be used as the layer height of a discarded layer, judging the layer height of the discarded layer and the allowable error value, outputting a result of discarding and printing the discarded layer if the layer height of the discarded layer is less than or equal to the allowable error value, and outputting a result of printing a standard layer at the discarded layer if the layer height of the discarded layer is greater than the allowable error value;
the operating interface of the processing system is provided with a first instruction button and a second instruction button which are used for forming a corresponding instruction by selecting the corresponding button;
when a first instruction button is selected, the processing unit judges whether the layer height of the standard layer is smaller than twice of the allowable error value, if not, the processing unit alarms to prompt the user to input the layer height of the standard layer again, and if so, the calculating unit calculates the number of printing layers, the residual height and the accumulated compression deformation amount again;
when the second instruction button is selected, the calculating unit calculates the number of printing layers, the residual height and the accumulated compression deformation, the processing unit further judges whether the layer height of the standard layer is smaller than the sum of the layer height of the abandoned layer and the allowable error value or not when the layer height of the abandoned layer is judged to be larger than the allowable error value, and if not, the alarm prompt is given to input the layer height of the standard layer again.
5. The multi-parameter quantization based 3D print rejection layer processing system of claim 4, wherein said calculation unit comprises a first calculation module and a second calculation module;
the input unit is also used for inputting the volume weight of the printing material, the hardening time of one standard layer and the time for printing one standard layer;
the first calculation module is connected with the input unit and calculates a first compression deformation amount from the first layer to the N-m layer according to the formula I, wherein the formula I is as follows:
Figure FDA0003652684290000031
Figure FDA0003652684290000032
the second calculation module is connected with the input unit and calculates a second compression deformation from the (N-m + 1) th layer to the (N) th layer according to the formula II, wherein the formula II is as follows:
Figure FDA0003652684290000033
Figure FDA0003652684290000034
xi in formula one and formula two1Is the first compression deformation amount, ξ2Is the second compression deformation amount,. DELTA.hiIs the cumulative amount of deformation of the ith layer, gamma is the volume weight of the printing material, hiIs the layer height of the i-th layer, hi+jIs the layer height of the (i + j) th layer, N is the number of printing layers, m is equal to the hardening time of a standard layer divided by the time of printing a standard layer, and is taken as an integer, E (T)i) Is TiModulus of deformation, T, corresponding to the momentiFor the moment when the i-th layer printing is completed, E (T)i+j) Is Ti+jModulus of deformation, T, corresponding to the momenti+jThe moment when the printing of the i + j-th layer is completed.
6. The multi-parameter quantization based 3D print rejection layer processing system of claim 5, wherein said first calculation module and said second calculation module are further connected to said processing unit and send the calculated first amount of compressive deformation and second amount of compressive deformation to said processing unit.
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